[PATCH v7 00/14] Update SMMUv3 to the modern iommu API (part 2b/3)

[PATCH v7 00/14] Update SMMUv3 to the modern iommu API (part 2b/3)

[Jason Gunthorpe]

Continuing the work of part 1 this focuses on the CD, PASID and SVA
components:

 - attach_dev failure does not change the HW configuration.

 - Full PASID API support including:
    - S1/SVA domains attached to PASIDs
    - IDENTITY/BLOCKED/S1 attached to RID
    - Change of the RID domain while PASIDs are attached

 - Streamlined SVA support using the core infrastructure

 - Hitless, whenever possible, change between two domains

Making the CD programming work like the new STE programming allows
untangling some of the confusing SVA flows. From there the focus is on
building out the core infrastructure for dealing with PASID and CD
entries, then keeping track of unique SSID's for ATS invalidation.

The ATS ordering is generalized so that the PASID flow can use it and put
into a form where it is fully hitless, whenever possible. Care is taken to
ensure that ATC flushes are present after any change in translation.

Finally we simply kill the entire outdated SVA mmu_notifier implementation
in one shot and switch it over to the newly created generic PASID & CD
code. This avoids the messy and confusing approach of trying to
incrementally untangle this in place. The new code is small and simple
enough this is much better than trying to figure out smaller steps.

Once SVA is resting on the right CD code it is straightforward to make the
PASID interface functionally complete.

It achieves the same goals as the several series from Michael and the S1DSS
series from Nicolin that were trying to improve portions of the API.

This is on github:
https://github.com/jgunthorpe/linux/commits/smmuv3_newapi

v7:
 - Second half of the split series
 - Rebase on Joerg's latest
 - Accommodate ARM_SMMU_FEAT_ATTR_TYPES_OVR for the S1DSS code
 - Include the S1DSS kunit tests
 - Include hunks to adjust the unit tests to API changes from this series
 - Move 3 BTM related patches out of this series, they can go in the BTM
   enablement series.
 - Move the domain_alloc_sva() conversion to the first patch, and rebase
   on the accepted core code change
 - Use the new core APIs for the PASID ops
 - Revise commit messages
v6: https://lore.kernel.org/r/0-v6-228e7adf25eb+4155-smmuv3_newapi_p2_jgg@nvidia.com

Jason Gunthorpe (14):
  iommu/arm-smmu-v3: Convert to domain_alloc_sva()
  iommu/arm-smmu-v3: Start building a generic PASID layer
  iommu/arm-smmu-v3: Make smmu_domain->devices into an allocated list
  iommu/arm-smmu-v3: Make changing domains be hitless for ATS
  iommu/arm-smmu-v3: Add ssid to struct arm_smmu_master_domain
  iommu/arm-smmu-v3: Do not use master->sva_enable to restrict attaches
  iommu/arm-smmu-v3: Thread SSID through the arm_smmu_attach_*()
    interface
  iommu/arm-smmu-v3: Make SVA allocate a normal arm_smmu_domain
  iommu/arm-smmu-v3: Keep track of arm_smmu_master_domain for SVA
  iommu/arm-smmu-v3: Put the SVA mmu notifier in the smmu_domain
  iommu/arm-smmu-v3: Allow IDENTITY/BLOCKED to be set while PASID is
    used
  iommu/arm-smmu-v3: Test the STE S1DSS functionality
  iommu/arm-smmu-v3: Allow a PASID to be set when RID is
    IDENTITY/BLOCKED
  iommu/arm-smmu-v3: Allow setting a S1 domain to a PASID

 .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c   | 434 +++-----------
 .../iommu/arm/arm-smmu-v3/arm-smmu-v3-test.c  | 116 +++-
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c   | 534 +++++++++++++-----
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h   |  52 +-
 4 files changed, 645 insertions(+), 491 deletions(-)


base-commit: 6bbed5b0a211d926fe494b722f5198a82f58a5c9
-- 
2.43.2


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[PATCH v7 01/14] iommu/arm-smmu-v3: Convert to domain_alloc_sva()

[Jason Gunthorpe]

This allows the driver the receive the mm and a always a device during
allocation. Later patches need this to properly setup the notifier when
the domain is first allocated.

Remove ops->domain_alloc() as SVA was the only remaining purpose.

Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Reviewed-by: Michael Shavit <mshavit@google.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c |  6 ++++--
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c     | 10 +---------
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h     |  6 +++++-
 3 files changed, 10 insertions(+), 12 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
index e490ffb3801545..28f8bf4327f69a 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
@@ -656,13 +656,15 @@ static const struct iommu_domain_ops arm_smmu_sva_domain_ops = {
 	.free			= arm_smmu_sva_domain_free
 };
 
-struct iommu_domain *arm_smmu_sva_domain_alloc(void)
+struct iommu_domain *arm_smmu_sva_domain_alloc(struct device *dev,
+					       struct mm_struct *mm)
 {
 	struct iommu_domain *domain;
 
 	domain = kzalloc(sizeof(*domain), GFP_KERNEL);
 	if (!domain)
-		return NULL;
+		return ERR_PTR(-ENOMEM);
+	domain->type = IOMMU_DOMAIN_SVA;
 	domain->ops = &arm_smmu_sva_domain_ops;
 
 	return domain;
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index ab415e107054c1..bd79422f7b6f50 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2237,14 +2237,6 @@ static bool arm_smmu_capable(struct device *dev, enum iommu_cap cap)
 	}
 }
 
-static struct iommu_domain *arm_smmu_domain_alloc(unsigned type)
-{
-
-	if (type == IOMMU_DOMAIN_SVA)
-		return arm_smmu_sva_domain_alloc();
-	return ERR_PTR(-EOPNOTSUPP);
-}
-
 static struct iommu_domain *arm_smmu_domain_alloc_paging(struct device *dev)
 {
 	struct arm_smmu_domain *smmu_domain;
@@ -3097,8 +3089,8 @@ static struct iommu_ops arm_smmu_ops = {
 	.identity_domain	= &arm_smmu_identity_domain,
 	.blocked_domain		= &arm_smmu_blocked_domain,
 	.capable		= arm_smmu_capable,
-	.domain_alloc		= arm_smmu_domain_alloc,
 	.domain_alloc_paging    = arm_smmu_domain_alloc_paging,
+	.domain_alloc_sva       = arm_smmu_sva_domain_alloc,
 	.probe_device		= arm_smmu_probe_device,
 	.release_device		= arm_smmu_release_device,
 	.device_group		= arm_smmu_device_group,
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
index 1242a086c9f948..4c6c843669aaf9 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -802,7 +802,8 @@ int arm_smmu_master_enable_sva(struct arm_smmu_master *master);
 int arm_smmu_master_disable_sva(struct arm_smmu_master *master);
 bool arm_smmu_master_iopf_supported(struct arm_smmu_master *master);
 void arm_smmu_sva_notifier_synchronize(void);
-struct iommu_domain *arm_smmu_sva_domain_alloc(void);
+struct iommu_domain *arm_smmu_sva_domain_alloc(struct device *dev,
+					       struct mm_struct *mm);
 void arm_smmu_sva_remove_dev_pasid(struct iommu_domain *domain,
 				   struct device *dev, ioasid_t id);
 #else /* CONFIG_ARM_SMMU_V3_SVA */
@@ -848,5 +849,8 @@ static inline void arm_smmu_sva_remove_dev_pasid(struct iommu_domain *domain,
 						 ioasid_t id)
 {
 }
+
+#define arm_smmu_sva_domain_alloc NULL
+
 #endif /* CONFIG_ARM_SMMU_V3_SVA */
 #endif /* _ARM_SMMU_V3_H */
-- 
2.43.2


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Re: [PATCH v7 01/14] iommu/arm-smmu-v3: Convert to domain_alloc_sva()

[Nicolin Chen]

On Wed, May 08, 2024 at 03:57:09PM -0300, Jason Gunthorpe wrote:

> @@ -848,5 +849,8 @@ static inline void arm_smmu_sva_remove_dev_pasid(struct iommu_domain *domain,
>  						 ioasid_t id)
>  {
>  }
> +
> +#define arm_smmu_sva_domain_alloc NULL
> +

Just a few lines above, there is still an inline define:
static inline struct iommu_domain *arm_smmu_sva_domain_alloc(void)
{
	return NULL;
}

Should we delete this too?

Nicolin

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Re: [PATCH v7 01/14] iommu/arm-smmu-v3: Convert to domain_alloc_sva()

[Jason Gunthorpe]

On Thu, May 09, 2024 at 11:21:59AM -0700, Nicolin Chen wrote:
> On Wed, May 08, 2024 at 03:57:09PM -0300, Jason Gunthorpe wrote:
> 
> > @@ -848,5 +849,8 @@ static inline void arm_smmu_sva_remove_dev_pasid(struct iommu_domain *domain,
> >  						 ioasid_t id)
> >  {
> >  }
> > +
> > +#define arm_smmu_sva_domain_alloc NULL
> > +
> 
> Just a few lines above, there is still an inline define:
> static inline struct iommu_domain *arm_smmu_sva_domain_alloc(void)
> {
> 	return NULL;
> }
> 
> Should we delete this too?

Yes, thanks, this is a rebasing mistake :|

Jason

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[PATCH v7 02/14] iommu/arm-smmu-v3: Start building a generic PASID layer

[Jason Gunthorpe]

Add arm_smmu_set_pasid()/arm_smmu_remove_pasid() which are to be used by
callers that already constructed the arm_smmu_cd they wish to program.

These functions will encapsulate the shared logic to setup a CD entry that
will be shared by SVA and S1 domain cases.

Prior fixes had already moved most of this logic up into
__arm_smmu_sva_bind(), move it to it's final home.

Following patches will relieve some of the remaining SVA restrictions:

 - The RID domain is a S1 domain and has already setup the STE to point to
   the CD table
 - The programmed PASID is the mm_get_enqcmd_pasid()
 - Nothing changes while SVA is running (sva_enable)

SVA invalidation will still iterate over the S1 domain's master list,
later patches will resolve that.

Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c   | 57 ++++++++++---------
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c   | 32 ++++++++++-
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h   |  9 ++-
 3 files changed, 67 insertions(+), 31 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
index 28f8bf4327f69a..71ca87c2c5c3b6 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
@@ -417,29 +417,27 @@ static void arm_smmu_mmu_notifier_put(struct arm_smmu_mmu_notifier *smmu_mn)
 	arm_smmu_free_shared_cd(cd);
 }
 
-static int __arm_smmu_sva_bind(struct device *dev, ioasid_t pasid,
-			       struct mm_struct *mm)
+static struct arm_smmu_bond *__arm_smmu_sva_bind(struct device *dev,
+						 struct mm_struct *mm)
 {
 	int ret;
-	struct arm_smmu_cd target;
-	struct arm_smmu_cd *cdptr;
 	struct arm_smmu_bond *bond;
 	struct arm_smmu_master *master = dev_iommu_priv_get(dev);
 	struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
 	struct arm_smmu_domain *smmu_domain;
 
 	if (!(domain->type & __IOMMU_DOMAIN_PAGING))
-		return -ENODEV;
+		return ERR_PTR(-ENODEV);
 	smmu_domain = to_smmu_domain(domain);
 	if (smmu_domain->stage != ARM_SMMU_DOMAIN_S1)
-		return -ENODEV;
+		return ERR_PTR(-ENODEV);
 
 	if (!master || !master->sva_enabled)
-		return -ENODEV;
+		return ERR_PTR(-ENODEV);
 
 	bond = kzalloc(sizeof(*bond), GFP_KERNEL);
 	if (!bond)
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
 
 	bond->mm = mm;
 
@@ -449,22 +447,12 @@ static int __arm_smmu_sva_bind(struct device *dev, ioasid_t pasid,
 		goto err_free_bond;
 	}
 
-	cdptr = arm_smmu_alloc_cd_ptr(master, mm_get_enqcmd_pasid(mm));
-	if (!cdptr) {
-		ret = -ENOMEM;
-		goto err_put_notifier;
-	}
-	arm_smmu_make_sva_cd(&target, master, mm, bond->smmu_mn->cd->asid);
-	arm_smmu_write_cd_entry(master, pasid, cdptr, &target);
-
 	list_add(&bond->list, &master->bonds);
-	return 0;
+	return bond;
 
-err_put_notifier:
-	arm_smmu_mmu_notifier_put(bond->smmu_mn);
 err_free_bond:
 	kfree(bond);
-	return ret;
+	return ERR_PTR(ret);
 }
 
 bool arm_smmu_sva_supported(struct arm_smmu_device *smmu)
@@ -611,10 +599,9 @@ void arm_smmu_sva_remove_dev_pasid(struct iommu_domain *domain,
 	struct arm_smmu_bond *bond = NULL, *t;
 	struct arm_smmu_master *master = dev_iommu_priv_get(dev);
 
+	arm_smmu_remove_pasid(master, to_smmu_domain(domain), id);
+
 	mutex_lock(&sva_lock);
-
-	arm_smmu_clear_cd(master, id);
-
 	list_for_each_entry(t, &master->bonds, list) {
 		if (t->mm == mm) {
 			bond = t;
@@ -633,17 +620,33 @@ void arm_smmu_sva_remove_dev_pasid(struct iommu_domain *domain,
 static int arm_smmu_sva_set_dev_pasid(struct iommu_domain *domain,
 				      struct device *dev, ioasid_t id)
 {
-	int ret = 0;
+	struct arm_smmu_master *master = dev_iommu_priv_get(dev);
 	struct mm_struct *mm = domain->mm;
+	struct arm_smmu_bond *bond;
+	struct arm_smmu_cd target;
+	int ret;
 
 	if (mm_get_enqcmd_pasid(mm) != id)
 		return -EINVAL;
 
 	mutex_lock(&sva_lock);
-	ret = __arm_smmu_sva_bind(dev, id, mm);
-	mutex_unlock(&sva_lock);
+	bond = __arm_smmu_sva_bind(dev, mm);
+	if (IS_ERR(bond)) {
+		mutex_unlock(&sva_lock);
+		return PTR_ERR(bond);
+	}
 
-	return ret;
+	arm_smmu_make_sva_cd(&target, master, mm, bond->smmu_mn->cd->asid);
+	ret = arm_smmu_set_pasid(master, NULL, id, &target);
+	if (ret) {
+		list_del(&bond->list);
+		arm_smmu_mmu_notifier_put(bond->smmu_mn);
+		kfree(bond);
+		mutex_unlock(&sva_lock);
+		return ret;
+	}
+	mutex_unlock(&sva_lock);
+	return 0;
 }
 
 static void arm_smmu_sva_domain_free(struct iommu_domain *domain)
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index bd79422f7b6f50..3f19436fe86a37 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -1211,8 +1211,8 @@ struct arm_smmu_cd *arm_smmu_get_cd_ptr(struct arm_smmu_master *master,
 	return &l1_desc->l2ptr[ssid % CTXDESC_L2_ENTRIES];
 }
 
-struct arm_smmu_cd *arm_smmu_alloc_cd_ptr(struct arm_smmu_master *master,
-					  u32 ssid)
+static struct arm_smmu_cd *arm_smmu_alloc_cd_ptr(struct arm_smmu_master *master,
+						 u32 ssid)
 {
 	struct arm_smmu_ctx_desc_cfg *cd_table = &master->cd_table;
 	struct arm_smmu_device *smmu = master->smmu;
@@ -2412,6 +2412,10 @@ static void arm_smmu_install_ste_for_dev(struct arm_smmu_master *master,
 	int i, j;
 	struct arm_smmu_device *smmu = master->smmu;
 
+	master->cd_table.in_ste =
+		FIELD_GET(STRTAB_STE_0_CFG, le64_to_cpu(target->data[0])) ==
+		STRTAB_STE_0_CFG_S1_TRANS;
+
 	for (i = 0; i < master->num_streams; ++i) {
 		u32 sid = master->streams[i].id;
 		struct arm_smmu_ste *step =
@@ -2632,6 +2636,30 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
 	return 0;
 }
 
+int arm_smmu_set_pasid(struct arm_smmu_master *master,
+		       struct arm_smmu_domain *smmu_domain, ioasid_t pasid,
+		       const struct arm_smmu_cd *cd)
+{
+	struct arm_smmu_cd *cdptr;
+
+	/* The core code validates pasid */
+
+	if (!master->cd_table.in_ste)
+		return -ENODEV;
+
+	cdptr = arm_smmu_alloc_cd_ptr(master, pasid);
+	if (!cdptr)
+		return -ENOMEM;
+	arm_smmu_write_cd_entry(master, pasid, cdptr, cd);
+	return 0;
+}
+
+void arm_smmu_remove_pasid(struct arm_smmu_master *master,
+			   struct arm_smmu_domain *smmu_domain, ioasid_t pasid)
+{
+	arm_smmu_clear_cd(master, pasid);
+}
+
 static int arm_smmu_attach_dev_ste(struct device *dev,
 				   struct arm_smmu_ste *ste)
 {
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
index 4c6c843669aaf9..a1b400e3e41878 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -602,6 +602,7 @@ struct arm_smmu_ctx_desc_cfg {
 	dma_addr_t			cdtab_dma;
 	struct arm_smmu_l1_ctx_desc	*l1_desc;
 	unsigned int			num_l1_ents;
+	u8				in_ste;
 	u8				s1fmt;
 	/* log2 of the maximum number of CDs supported by this table */
 	u8				s1cdmax;
@@ -777,8 +778,6 @@ extern struct mutex arm_smmu_asid_lock;
 void arm_smmu_clear_cd(struct arm_smmu_master *master, ioasid_t ssid);
 struct arm_smmu_cd *arm_smmu_get_cd_ptr(struct arm_smmu_master *master,
 					u32 ssid);
-struct arm_smmu_cd *arm_smmu_alloc_cd_ptr(struct arm_smmu_master *master,
-					  u32 ssid);
 void arm_smmu_make_s1_cd(struct arm_smmu_cd *target,
 			 struct arm_smmu_master *master,
 			 struct arm_smmu_domain *smmu_domain);
@@ -786,6 +785,12 @@ void arm_smmu_write_cd_entry(struct arm_smmu_master *master, int ssid,
 			     struct arm_smmu_cd *cdptr,
 			     const struct arm_smmu_cd *target);
 
+int arm_smmu_set_pasid(struct arm_smmu_master *master,
+		       struct arm_smmu_domain *smmu_domain, ioasid_t pasid,
+		       const struct arm_smmu_cd *cd);
+void arm_smmu_remove_pasid(struct arm_smmu_master *master,
+			   struct arm_smmu_domain *smmu_domain, ioasid_t pasid);
+
 void arm_smmu_tlb_inv_asid(struct arm_smmu_device *smmu, u16 asid);
 void arm_smmu_tlb_inv_range_asid(unsigned long iova, size_t size, int asid,
 				 size_t granule, bool leaf,
-- 
2.43.2


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Re: [PATCH v7 02/14] iommu/arm-smmu-v3: Start building a generic PASID layer

[Nicolin Chen]

On Wed, May 08, 2024 at 03:57:10PM -0300, Jason Gunthorpe wrote:
> @@ -611,10 +599,9 @@ void arm_smmu_sva_remove_dev_pasid(struct iommu_domain *domain,
>  	struct arm_smmu_bond *bond = NULL, *t;
>  	struct arm_smmu_master *master = dev_iommu_priv_get(dev);
>  
> +	arm_smmu_remove_pasid(master, to_smmu_domain(domain), id);
> +
>  	mutex_lock(&sva_lock);
> -
> -	arm_smmu_clear_cd(master, id);
> -

Should the new arm_smmu_remove_pasid() be inside the sva_lock as
the arm_smmu_clear_cd() previously? This would also seem to match
with the arm_smmu_set_pasid() that's inside the sva_lock too.

With that, arm_smmu_remove_pasid() seems to be removed entirely
by a following change, though its function declare still exists
in arm-smmu-v3.h (I probably should find what following patch and
comment there..)

> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> @@ -2412,6 +2412,10 @@ static void arm_smmu_install_ste_for_dev(struct arm_smmu_master *master,
>  	int i, j;
>  	struct arm_smmu_device *smmu = master->smmu;
>  
> +	master->cd_table.in_ste =
> +		FIELD_GET(STRTAB_STE_0_CFG, le64_to_cpu(target->data[0])) ==
> +		STRTAB_STE_0_CFG_S1_TRANS;
> +

> +int arm_smmu_set_pasid(struct arm_smmu_master *master,
> +		       struct arm_smmu_domain *smmu_domain, ioasid_t pasid,
> +		       const struct arm_smmu_cd *cd)
> +{
> +	struct arm_smmu_cd *cdptr;
> +
> +	/* The core code validates pasid */
> +
> +	if (!master->cd_table.in_ste)
> +		return -ENODEV;
> +
> +	cdptr = arm_smmu_alloc_cd_ptr(master, pasid);
> +	if (!cdptr)
> +		return -ENOMEM;

Though I might be missing some piece, the in_ste is set in the
arm_smmu_install_ste_for_dev() when STE.Config=S1_TRANS, in which
case cdptr is already allocated? If so, do we still need to call
arm_smmu_alloc_cd_ptr()? Or just arm_smmu_get_cd_ptr() instead?

Thanks
Nicolin

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Re: [PATCH v7 02/14] iommu/arm-smmu-v3: Start building a generic PASID layer

[Jason Gunthorpe]

On Fri, May 10, 2024 at 07:32:16PM -0700, Nicolin Chen wrote:
> On Wed, May 08, 2024 at 03:57:10PM -0300, Jason Gunthorpe wrote:
> > @@ -611,10 +599,9 @@ void arm_smmu_sva_remove_dev_pasid(struct iommu_domain *domain,
> >  	struct arm_smmu_bond *bond = NULL, *t;
> >  	struct arm_smmu_master *master = dev_iommu_priv_get(dev);
> >  
> > +	arm_smmu_remove_pasid(master, to_smmu_domain(domain), id);
> > +
> >  	mutex_lock(&sva_lock);
> > -
> > -	arm_smmu_clear_cd(master, id);
> > -
> 
> Should the new arm_smmu_remove_pasid() be inside the sva_lock as
> the arm_smmu_clear_cd() previously? This would also seem to match
> with the arm_smmu_set_pasid() that's inside the sva_lock too.

Not needed, the sva_lock primarily protects the bond/etc stuff. The CD
is locked by the group mutex. By the end of the series the sva_lock is
just protecting the set_feature stuff, none of the attach flow.

> With that, arm_smmu_remove_pasid() seems to be removed entirely
> by a following change, though its function declare still exists
> in arm-smmu-v3.h (I probably should find what following patch and
> comment there..)

Woops, yep, I missed that.

> > +int arm_smmu_set_pasid(struct arm_smmu_master *master,
> > +		       struct arm_smmu_domain *smmu_domain, ioasid_t pasid,
> > +		       const struct arm_smmu_cd *cd)
> > +{
> > +	struct arm_smmu_cd *cdptr;
> > +
> > +	/* The core code validates pasid */
> > +
> > +	if (!master->cd_table.in_ste)
> > +		return -ENODEV;
> > +
> > +	cdptr = arm_smmu_alloc_cd_ptr(master, pasid);
> > +	if (!cdptr)
> > +		return -ENOMEM;
> 
> Though I might be missing some piece, the in_ste is set in the
> arm_smmu_install_ste_for_dev() when STE.Config=S1_TRANS, in which
> case cdptr is already allocated? 

This only means that at least the first level of a two level (or
entire linear) table is allocated.

alloc_cd_ptr() is sill needed to allocate any second level. For
instance if the PASID is > 1024 then we will need a new second level
page as only SSID=0 will have been allocated.

When we get further along in the series the above changes to:

	if (!master->cd_table.in_ste &&
	    sid_domain->type != IOMMU_DOMAIN_IDENTITY &&
	    sid_domain->type != IOMMU_DOMAIN_BLOCKED)
		return -EINVAL;

	cdptr = arm_smmu_alloc_cd_ptr(master, pasid);

In those additional cases the entire allocation can be needed.

Jason

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Re: [PATCH v7 02/14] iommu/arm-smmu-v3: Start building a generic PASID layer

[Nicolin Chen]

On Sun, May 12, 2024 at 10:12:15AM -0300, Jason Gunthorpe wrote:
> On Fri, May 10, 2024 at 07:32:16PM -0700, Nicolin Chen wrote:
> > On Wed, May 08, 2024 at 03:57:10PM -0300, Jason Gunthorpe wrote:
> > > @@ -611,10 +599,9 @@ void arm_smmu_sva_remove_dev_pasid(struct iommu_domain *domain,
> > >  	struct arm_smmu_bond *bond = NULL, *t;
> > >  	struct arm_smmu_master *master = dev_iommu_priv_get(dev);
> > >  
> > > +	arm_smmu_remove_pasid(master, to_smmu_domain(domain), id);
> > > +
> > >  	mutex_lock(&sva_lock);
> > > -
> > > -	arm_smmu_clear_cd(master, id);
> > > -
> > 
> > Should the new arm_smmu_remove_pasid() be inside the sva_lock as
> > the arm_smmu_clear_cd() previously? This would also seem to match
> > with the arm_smmu_set_pasid() that's inside the sva_lock too.
> 
> Not needed, the sva_lock primarily protects the bond/etc stuff. The CD
> is locked by the group mutex. By the end of the series the sva_lock is
> just protecting the set_feature stuff, none of the attach flow.

I see. That lock in the end product does look cleaner.

> > > +int arm_smmu_set_pasid(struct arm_smmu_master *master,
> > > +		       struct arm_smmu_domain *smmu_domain, ioasid_t pasid,
> > > +		       const struct arm_smmu_cd *cd)
> > > +{
> > > +	struct arm_smmu_cd *cdptr;
> > > +
> > > +	/* The core code validates pasid */
> > > +
> > > +	if (!master->cd_table.in_ste)
> > > +		return -ENODEV;
> > > +
> > > +	cdptr = arm_smmu_alloc_cd_ptr(master, pasid);
> > > +	if (!cdptr)
> > > +		return -ENOMEM;
> > 
> > Though I might be missing some piece, the in_ste is set in the
> > arm_smmu_install_ste_for_dev() when STE.Config=S1_TRANS, in which
> > case cdptr is already allocated? 
> 
> This only means that at least the first level of a two level (or
> entire linear) table is allocated.
> 
> alloc_cd_ptr() is sill needed to allocate any second level. For
> instance if the PASID is > 1024 then we will need a new second level
> page as only SSID=0 will have been allocated.

Oh, I had misread that v.s. arm_smmu_alloc_cd_tables, while a
cdptr here is a CD entry.

Thanks
Nicolin

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[PATCH v7 03/14] iommu/arm-smmu-v3: Make smmu_domain->devices into an allocated list

[Jason Gunthorpe]

The next patch will need to store the same master twice (with different
SSIDs), so allocate memory for each list element.

Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Reviewed-by: Michael Shavit <mshavit@google.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c   | 11 ++++--
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c   | 39 ++++++++++++++++---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h   |  7 +++-
 3 files changed, 47 insertions(+), 10 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
index 71ca87c2c5c3b6..cb3a0e4143c84a 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
@@ -38,12 +38,13 @@ static DEFINE_MUTEX(sva_lock);
 static void
 arm_smmu_update_s1_domain_cd_entry(struct arm_smmu_domain *smmu_domain)
 {
-	struct arm_smmu_master *master;
+	struct arm_smmu_master_domain *master_domain;
 	struct arm_smmu_cd target_cd;
 	unsigned long flags;
 
 	spin_lock_irqsave(&smmu_domain->devices_lock, flags);
-	list_for_each_entry(master, &smmu_domain->devices, domain_head) {
+	list_for_each_entry(master_domain, &smmu_domain->devices, devices_elm) {
+		struct arm_smmu_master *master = master_domain->master;
 		struct arm_smmu_cd *cdptr;
 
 		/* S1 domains only support RID attachment right now */
@@ -301,7 +302,7 @@ static void arm_smmu_mm_release(struct mmu_notifier *mn, struct mm_struct *mm)
 {
 	struct arm_smmu_mmu_notifier *smmu_mn = mn_to_smmu(mn);
 	struct arm_smmu_domain *smmu_domain = smmu_mn->domain;
-	struct arm_smmu_master *master;
+	struct arm_smmu_master_domain *master_domain;
 	unsigned long flags;
 
 	mutex_lock(&sva_lock);
@@ -315,7 +316,9 @@ static void arm_smmu_mm_release(struct mmu_notifier *mn, struct mm_struct *mm)
 	 * but disable translation.
 	 */
 	spin_lock_irqsave(&smmu_domain->devices_lock, flags);
-	list_for_each_entry(master, &smmu_domain->devices, domain_head) {
+	list_for_each_entry(master_domain, &smmu_domain->devices,
+			    devices_elm) {
+		struct arm_smmu_master *master = master_domain->master;
 		struct arm_smmu_cd target;
 		struct arm_smmu_cd *cdptr;
 
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 3f19436fe86a37..532fe17f28bfe5 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2015,10 +2015,10 @@ static int arm_smmu_atc_inv_master(struct arm_smmu_master *master)
 int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain, int ssid,
 			    unsigned long iova, size_t size)
 {
+	struct arm_smmu_master_domain *master_domain;
 	int i;
 	unsigned long flags;
 	struct arm_smmu_cmdq_ent cmd;
-	struct arm_smmu_master *master;
 	struct arm_smmu_cmdq_batch cmds;
 
 	if (!(smmu_domain->smmu->features & ARM_SMMU_FEAT_ATS))
@@ -2046,7 +2046,10 @@ int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain, int ssid,
 	cmds.num = 0;
 
 	spin_lock_irqsave(&smmu_domain->devices_lock, flags);
-	list_for_each_entry(master, &smmu_domain->devices, domain_head) {
+	list_for_each_entry(master_domain, &smmu_domain->devices,
+			    devices_elm) {
+		struct arm_smmu_master *master = master_domain->master;
+
 		if (!master->ats_enabled)
 			continue;
 
@@ -2534,9 +2537,26 @@ static void arm_smmu_disable_pasid(struct arm_smmu_master *master)
 	pci_disable_pasid(pdev);
 }
 
+static struct arm_smmu_master_domain *
+arm_smmu_find_master_domain(struct arm_smmu_domain *smmu_domain,
+			    struct arm_smmu_master *master)
+{
+	struct arm_smmu_master_domain *master_domain;
+
+	lockdep_assert_held(&smmu_domain->devices_lock);
+
+	list_for_each_entry(master_domain, &smmu_domain->devices,
+			    devices_elm) {
+		if (master_domain->master == master)
+			return master_domain;
+	}
+	return NULL;
+}
+
 static void arm_smmu_detach_dev(struct arm_smmu_master *master)
 {
 	struct iommu_domain *domain = iommu_get_domain_for_dev(master->dev);
+	struct arm_smmu_master_domain *master_domain;
 	struct arm_smmu_domain *smmu_domain;
 	unsigned long flags;
 
@@ -2547,7 +2567,11 @@ static void arm_smmu_detach_dev(struct arm_smmu_master *master)
 	arm_smmu_disable_ats(master, smmu_domain);
 
 	spin_lock_irqsave(&smmu_domain->devices_lock, flags);
-	list_del_init(&master->domain_head);
+	master_domain = arm_smmu_find_master_domain(smmu_domain, master);
+	if (master_domain) {
+		list_del(&master_domain->devices_elm);
+		kfree(master_domain);
+	}
 	spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
 
 	master->ats_enabled = false;
@@ -2561,6 +2585,7 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 	struct arm_smmu_device *smmu;
 	struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+	struct arm_smmu_master_domain *master_domain;
 	struct arm_smmu_master *master;
 	struct arm_smmu_cd *cdptr;
 
@@ -2597,6 +2622,11 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
 			return -ENOMEM;
 	}
 
+	master_domain = kzalloc(sizeof(*master_domain), GFP_KERNEL);
+	if (!master_domain)
+		return -ENOMEM;
+	master_domain->master = master;
+
 	/*
 	 * Prevent arm_smmu_share_asid() from trying to change the ASID
 	 * of either the old or new domain while we are working on it.
@@ -2610,7 +2640,7 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
 	master->ats_enabled = arm_smmu_ats_supported(master);
 
 	spin_lock_irqsave(&smmu_domain->devices_lock, flags);
-	list_add(&master->domain_head, &smmu_domain->devices);
+	list_add(&master_domain->devices_elm, &smmu_domain->devices);
 	spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
 
 	switch (smmu_domain->stage) {
@@ -2925,7 +2955,6 @@ static struct iommu_device *arm_smmu_probe_device(struct device *dev)
 	master->dev = dev;
 	master->smmu = smmu;
 	INIT_LIST_HEAD(&master->bonds);
-	INIT_LIST_HEAD(&master->domain_head);
 	dev_iommu_priv_set(dev, master);
 
 	ret = arm_smmu_insert_master(smmu, master);
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
index a1b400e3e41878..125b52ea5ad71c 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -697,7 +697,6 @@ struct arm_smmu_stream {
 struct arm_smmu_master {
 	struct arm_smmu_device		*smmu;
 	struct device			*dev;
-	struct list_head		domain_head;
 	struct arm_smmu_stream		*streams;
 	/* Locked by the iommu core using the group mutex */
 	struct arm_smmu_ctx_desc_cfg	cd_table;
@@ -731,6 +730,7 @@ struct arm_smmu_domain {
 
 	struct iommu_domain		domain;
 
+	/* List of struct arm_smmu_master_domain */
 	struct list_head		devices;
 	spinlock_t			devices_lock;
 
@@ -767,6 +767,11 @@ void arm_smmu_make_sva_cd(struct arm_smmu_cd *target,
 			  u16 asid);
 #endif
 
+struct arm_smmu_master_domain {
+	struct list_head devices_elm;
+	struct arm_smmu_master *master;
+};
+
 static inline struct arm_smmu_domain *to_smmu_domain(struct iommu_domain *dom)
 {
 	return container_of(dom, struct arm_smmu_domain, domain);
-- 
2.43.2


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Re: [PATCH v7 03/14] iommu/arm-smmu-v3: Make smmu_domain->devices into an allocated list

[Nicolin Chen]

On Wed, May 08, 2024 at 03:57:11PM -0300, Jason Gunthorpe wrote:
> The next patch will need to store the same master twice (with different
> SSIDs), so allocate memory for each list element.
> 
> Tested-by: Nicolin Chen <nicolinc@nvidia.com>
> Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
> Reviewed-by: Michael Shavit <mshavit@google.com>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>

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[PATCH v7 04/14] iommu/arm-smmu-v3: Make changing domains be hitless for ATS

[Jason Gunthorpe]

The core code allows the domain to be changed on the fly without a forced
stop in BLOCKED/IDENTITY. In this flow the driver should just continually
maintain the ATS with no change while the STE is updated.

ATS relies on a linked list smmu_domain->devices to keep track of which
masters have the domain programmed, but this list is also used by
arm_smmu_share_asid(), unrelated to ats.

Create two new functions to encapsulate this combined logic:
 arm_smmu_attach_prepare()
 <caller generates and sets the STE>
 arm_smmu_attach_commit()

The two functions can sequence both enabling ATS and disabling across
the STE store. Have every update of the STE use this sequence.

Installing a S1/S2 domain always enables the ATS if the PCIe device
supports it.

The enable flow is now ordered differently to allow it to be hitless:

 1) Add the master to the new smmu_domain->devices list
 2) Program the STE
 3) Enable ATS at PCIe
 4) Remove the master from the old smmu_domain

This flow ensures that invalidations to either domain will generate an ATC
invalidation to the device while the STE is being switched. Thus we don't
need to turn off the ATS anymore for correctness.

The disable flow is the reverse:
 1) Disable ATS at PCIe
 2) Program the STE
 3) Invalidate the ATC
 4) Remove the master from the old smmu_domain

Move the nr_ats_masters adjustments to be close to the list
manipulations. It is a count of the number of ATS enabled masters
currently in the list. This is stricly before and after the STE/CD are
revised, and done under the list's spin_lock.

This is part of the bigger picture to allow changing the RID domain while
a PASID is in use. If a SVA PASID is relying on ATS to function then
changing the RID domain cannot just temporarily toggle ATS off without
also wrecking the SVA PASID. The new infrastructure here is organized so
that the PASID attach/detach flows will make use of it as well in
following patches.

Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 .../iommu/arm/arm-smmu-v3/arm-smmu-v3-test.c  |   5 +-
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c   | 201 +++++++++++++-----
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h   |   6 +-
 3 files changed, 149 insertions(+), 63 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-test.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-test.c
index 315e487fd990eb..a460b71f585789 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-test.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-test.c
@@ -164,7 +164,7 @@ static void arm_smmu_test_make_cdtable_ste(struct arm_smmu_ste *ste,
 		.smmu = &smmu,
 	};
 
-	arm_smmu_make_cdtable_ste(ste, &master);
+	arm_smmu_make_cdtable_ste(ste, &master, true);
 }
 
 static void arm_smmu_v3_write_ste_test_bypass_to_abort(struct kunit *test)
@@ -231,7 +231,6 @@ static void arm_smmu_test_make_s2_ste(struct arm_smmu_ste *ste,
 {
 	struct arm_smmu_master master = {
 		.smmu = &smmu,
-		.ats_enabled = ats_enabled,
 	};
 	struct io_pgtable io_pgtable = {};
 	struct arm_smmu_domain smmu_domain = {
@@ -247,7 +246,7 @@ static void arm_smmu_test_make_s2_ste(struct arm_smmu_ste *ste,
 	io_pgtable.cfg.arm_lpae_s2_cfg.vtcr.sl = 3;
 	io_pgtable.cfg.arm_lpae_s2_cfg.vtcr.tsz = 4;
 
-	arm_smmu_make_s2_domain_ste(ste, &master, &smmu_domain);
+	arm_smmu_make_s2_domain_ste(ste, &master, &smmu_domain, ats_enabled);
 }
 
 static void arm_smmu_v3_write_ste_test_s2_to_abort(struct kunit *test)
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 532fe17f28bfe5..01e970f6ee4363 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -1538,7 +1538,7 @@ EXPORT_SYMBOL_IF_KUNIT(arm_smmu_make_bypass_ste);
 
 VISIBLE_IF_KUNIT
 void arm_smmu_make_cdtable_ste(struct arm_smmu_ste *target,
-			       struct arm_smmu_master *master)
+			       struct arm_smmu_master *master, bool ats_enabled)
 {
 	struct arm_smmu_ctx_desc_cfg *cd_table = &master->cd_table;
 	struct arm_smmu_device *smmu = master->smmu;
@@ -1561,7 +1561,7 @@ void arm_smmu_make_cdtable_ste(struct arm_smmu_ste *target,
 			 STRTAB_STE_1_S1STALLD :
 			 0) |
 		FIELD_PREP(STRTAB_STE_1_EATS,
-			   master->ats_enabled ? STRTAB_STE_1_EATS_TRANS : 0));
+			   ats_enabled ? STRTAB_STE_1_EATS_TRANS : 0));
 
 	if (smmu->features & ARM_SMMU_FEAT_E2H) {
 		/*
@@ -1591,7 +1591,8 @@ EXPORT_SYMBOL_IF_KUNIT(arm_smmu_make_cdtable_ste);
 VISIBLE_IF_KUNIT
 void arm_smmu_make_s2_domain_ste(struct arm_smmu_ste *target,
 				 struct arm_smmu_master *master,
-				 struct arm_smmu_domain *smmu_domain)
+				 struct arm_smmu_domain *smmu_domain,
+				 bool ats_enabled)
 {
 	struct arm_smmu_s2_cfg *s2_cfg = &smmu_domain->s2_cfg;
 	const struct io_pgtable_cfg *pgtbl_cfg =
@@ -1608,7 +1609,7 @@ void arm_smmu_make_s2_domain_ste(struct arm_smmu_ste *target,
 
 	target->data[1] = cpu_to_le64(
 		FIELD_PREP(STRTAB_STE_1_EATS,
-			   master->ats_enabled ? STRTAB_STE_1_EATS_TRANS : 0));
+			   ats_enabled ? STRTAB_STE_1_EATS_TRANS : 0));
 
 	if (smmu->features & ARM_SMMU_FEAT_ATTR_TYPES_OVR)
 		target->data[1] |= cpu_to_le64(FIELD_PREP(STRTAB_STE_1_SHCFG,
@@ -2450,22 +2451,16 @@ static bool arm_smmu_ats_supported(struct arm_smmu_master *master)
 	return dev_is_pci(dev) && pci_ats_supported(to_pci_dev(dev));
 }
 
-static void arm_smmu_enable_ats(struct arm_smmu_master *master,
-				struct arm_smmu_domain *smmu_domain)
+static void arm_smmu_enable_ats(struct arm_smmu_master *master)
 {
 	size_t stu;
 	struct pci_dev *pdev;
 	struct arm_smmu_device *smmu = master->smmu;
 
-	/* Don't enable ATS at the endpoint if it's not enabled in the STE */
-	if (!master->ats_enabled)
-		return;
-
 	/* Smallest Translation Unit: log2 of the smallest supported granule */
 	stu = __ffs(smmu->pgsize_bitmap);
 	pdev = to_pci_dev(master->dev);
 
-	atomic_inc(&smmu_domain->nr_ats_masters);
 	/*
 	 * ATC invalidation of PASID 0 causes the entire ATC to be flushed.
 	 */
@@ -2474,22 +2469,6 @@ static void arm_smmu_enable_ats(struct arm_smmu_master *master,
 		dev_err(master->dev, "Failed to enable ATS (STU %zu)\n", stu);
 }
 
-static void arm_smmu_disable_ats(struct arm_smmu_master *master,
-				 struct arm_smmu_domain *smmu_domain)
-{
-	if (!master->ats_enabled)
-		return;
-
-	pci_disable_ats(to_pci_dev(master->dev));
-	/*
-	 * Ensure ATS is disabled at the endpoint before we issue the
-	 * ATC invalidation via the SMMU.
-	 */
-	wmb();
-	arm_smmu_atc_inv_master(master);
-	atomic_dec(&smmu_domain->nr_ats_masters);
-}
-
 static int arm_smmu_enable_pasid(struct arm_smmu_master *master)
 {
 	int ret;
@@ -2553,39 +2532,147 @@ arm_smmu_find_master_domain(struct arm_smmu_domain *smmu_domain,
 	return NULL;
 }
 
-static void arm_smmu_detach_dev(struct arm_smmu_master *master)
+/*
+ * If the domain uses the smmu_domain->devices list return the arm_smmu_domain
+ * structure, otherwise NULL. These domains track attached devices so they can
+ * issue invalidations.
+ */
+static struct arm_smmu_domain *
+to_smmu_domain_devices(struct iommu_domain *domain)
 {
-	struct iommu_domain *domain = iommu_get_domain_for_dev(master->dev);
+	/* The domain can be NULL only when processing the first attach */
+	if (!domain)
+		return NULL;
+	if (domain->type & __IOMMU_DOMAIN_PAGING)
+		return to_smmu_domain(domain);
+	return NULL;
+}
+
+static void arm_smmu_remove_master_domain(struct arm_smmu_master *master,
+					  struct iommu_domain *domain)
+{
+	struct arm_smmu_domain *smmu_domain = to_smmu_domain_devices(domain);
 	struct arm_smmu_master_domain *master_domain;
-	struct arm_smmu_domain *smmu_domain;
 	unsigned long flags;
 
-	if (!domain || !(domain->type & __IOMMU_DOMAIN_PAGING))
+	if (!smmu_domain)
 		return;
 
-	smmu_domain = to_smmu_domain(domain);
-	arm_smmu_disable_ats(master, smmu_domain);
-
 	spin_lock_irqsave(&smmu_domain->devices_lock, flags);
 	master_domain = arm_smmu_find_master_domain(smmu_domain, master);
 	if (master_domain) {
 		list_del(&master_domain->devices_elm);
 		kfree(master_domain);
+		if (master->ats_enabled)
+			atomic_dec(&smmu_domain->nr_ats_masters);
 	}
 	spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
+}
 
-	master->ats_enabled = false;
+struct attach_state {
+	bool want_ats;
+	bool disable_ats;
+	struct iommu_domain *old_domain;
+};
+
+/*
+ * Prepare to attach a domain to a master. If disable_ats is not set this will
+ * turn on ATS if supported. smmu_domain can be NULL if the domain being
+ * attached does not have a page table and does not require invalidation
+ * tracking.
+ */
+static int arm_smmu_attach_prepare(struct arm_smmu_master *master,
+				   struct iommu_domain *domain,
+				   struct attach_state *state)
+{
+	struct arm_smmu_domain *smmu_domain =
+		to_smmu_domain_devices(domain);
+	struct arm_smmu_master_domain *master_domain;
+	unsigned long flags;
+
+	/*
+	 * arm_smmu_share_asid() must not see two domains pointing to the same
+	 * arm_smmu_master_domain contents otherwise it could randomly write one
+	 * or the other to the CD.
+	 */
+	lockdep_assert_held(&arm_smmu_asid_lock);
+
+	state->want_ats = !state->disable_ats && arm_smmu_ats_supported(master);
+
+	if (smmu_domain) {
+		master_domain = kzalloc(sizeof(*master_domain), GFP_KERNEL);
+		if (!master_domain)
+			return -ENOMEM;
+		master_domain->master = master;
+
+		/*
+		 * During prepare we want the current smmu_domain and new
+		 * smmu_domain to be in the devices list before we change any
+		 * HW. This ensures that both domains will send ATS
+		 * invalidations to the master until we are done.
+		 *
+		 * It is tempting to make this list only track masters that are
+		 * using ATS, but arm_smmu_share_asid() also uses this to change
+		 * the ASID of a domain, unrelated to ATS.
+		 *
+		 * Notice if we are re-attaching the same domain then the list
+		 * will have two identical entries and commit will remove only
+		 * one of them.
+		 */
+		spin_lock_irqsave(&smmu_domain->devices_lock, flags);
+		if (state->want_ats)
+			atomic_inc(&smmu_domain->nr_ats_masters);
+		list_add(&master_domain->devices_elm, &smmu_domain->devices);
+		spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
+	}
+
+	if (!state->want_ats && master->ats_enabled) {
+		pci_disable_ats(to_pci_dev(master->dev));
+		/*
+		 * This is probably overkill, but the config write for disabling
+		 * ATS should complete before the STE is configured to generate
+		 * UR to avoid AER noise.
+		 */
+		wmb();
+	}
+	return 0;
+}
+
+/*
+ * Commit is done after the STE/CD are configured with the EATS setting. It
+ * completes synchronizing the PCI device's ATC and finishes manipulating the
+ * smmu_domain->devices list.
+ */
+static void arm_smmu_attach_commit(struct arm_smmu_master *master,
+				   struct attach_state *state)
+{
+	lockdep_assert_held(&arm_smmu_asid_lock);
+
+	if (state->want_ats && !master->ats_enabled) {
+		arm_smmu_enable_ats(master);
+	} else if (master->ats_enabled) {
+		/*
+		 * The translation has changed, flush the ATC. At this point the
+		 * SMMU is translating for the new domain and both the old&new
+		 * domain will issue invalidations.
+		 */
+		arm_smmu_atc_inv_master(master);
+	}
+	master->ats_enabled = state->want_ats;
+
+	arm_smmu_remove_master_domain(master, state->old_domain);
 }
 
 static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
 {
 	int ret = 0;
-	unsigned long flags;
 	struct arm_smmu_ste target;
 	struct iommu_fwspec *fwspec = dev_iommu_fwspec_get(dev);
 	struct arm_smmu_device *smmu;
 	struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
-	struct arm_smmu_master_domain *master_domain;
+	struct attach_state state = {
+		.old_domain = iommu_get_domain_for_dev(dev),
+	};
 	struct arm_smmu_master *master;
 	struct arm_smmu_cd *cdptr;
 
@@ -2622,11 +2709,6 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
 			return -ENOMEM;
 	}
 
-	master_domain = kzalloc(sizeof(*master_domain), GFP_KERNEL);
-	if (!master_domain)
-		return -ENOMEM;
-	master_domain->master = master;
-
 	/*
 	 * Prevent arm_smmu_share_asid() from trying to change the ASID
 	 * of either the old or new domain while we are working on it.
@@ -2635,13 +2717,11 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
 	 */
 	mutex_lock(&arm_smmu_asid_lock);
 
-	arm_smmu_detach_dev(master);
-
-	master->ats_enabled = arm_smmu_ats_supported(master);
-
-	spin_lock_irqsave(&smmu_domain->devices_lock, flags);
-	list_add(&master_domain->devices_elm, &smmu_domain->devices);
-	spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
+	ret = arm_smmu_attach_prepare(master, domain, &state);
+	if (ret) {
+		mutex_unlock(&arm_smmu_asid_lock);
+		return ret;
+	}
 
 	switch (smmu_domain->stage) {
 	case ARM_SMMU_DOMAIN_S1: {
@@ -2650,18 +2730,19 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
 		arm_smmu_make_s1_cd(&target_cd, master, smmu_domain);
 		arm_smmu_write_cd_entry(master, IOMMU_NO_PASID, cdptr,
 					&target_cd);
-		arm_smmu_make_cdtable_ste(&target, master);
+		arm_smmu_make_cdtable_ste(&target, master, state.want_ats);
 		arm_smmu_install_ste_for_dev(master, &target);
 		break;
 	}
 	case ARM_SMMU_DOMAIN_S2:
-		arm_smmu_make_s2_domain_ste(&target, master, smmu_domain);
+		arm_smmu_make_s2_domain_ste(&target, master, smmu_domain,
+					    state.want_ats);
 		arm_smmu_install_ste_for_dev(master, &target);
 		arm_smmu_clear_cd(master, IOMMU_NO_PASID);
 		break;
 	}
 
-	arm_smmu_enable_ats(master, smmu_domain);
+	arm_smmu_attach_commit(master, &state);
 	mutex_unlock(&arm_smmu_asid_lock);
 	return 0;
 }
@@ -2690,10 +2771,13 @@ void arm_smmu_remove_pasid(struct arm_smmu_master *master,
 	arm_smmu_clear_cd(master, pasid);
 }
 
-static int arm_smmu_attach_dev_ste(struct device *dev,
-				   struct arm_smmu_ste *ste)
+static int arm_smmu_attach_dev_ste(struct iommu_domain *domain,
+				   struct device *dev, struct arm_smmu_ste *ste)
 {
 	struct arm_smmu_master *master = dev_iommu_priv_get(dev);
+	struct attach_state state = {
+		.old_domain = iommu_get_domain_for_dev(dev),
+	};
 
 	if (arm_smmu_master_sva_enabled(master))
 		return -EBUSY;
@@ -2711,9 +2795,10 @@ static int arm_smmu_attach_dev_ste(struct device *dev,
 	 * the stream (STE.EATS == 0b00), causing F_BAD_ATS_TREQ and
 	 * F_TRANSL_FORBIDDEN events (IHI0070Ea 5.2 Stream Table Entry).
 	 */
-	arm_smmu_detach_dev(master);
-
+	state.disable_ats = true;
+	arm_smmu_attach_prepare(master, domain, &state);
 	arm_smmu_install_ste_for_dev(master, ste);
+	arm_smmu_attach_commit(master, &state);
 	mutex_unlock(&arm_smmu_asid_lock);
 
 	/*
@@ -2732,7 +2817,7 @@ static int arm_smmu_attach_dev_identity(struct iommu_domain *domain,
 	struct arm_smmu_master *master = dev_iommu_priv_get(dev);
 
 	arm_smmu_make_bypass_ste(master->smmu, &ste);
-	return arm_smmu_attach_dev_ste(dev, &ste);
+	return arm_smmu_attach_dev_ste(domain, dev, &ste);
 }
 
 static const struct iommu_domain_ops arm_smmu_identity_ops = {
@@ -2750,7 +2835,7 @@ static int arm_smmu_attach_dev_blocked(struct iommu_domain *domain,
 	struct arm_smmu_ste ste;
 
 	arm_smmu_make_abort_ste(&ste);
-	return arm_smmu_attach_dev_ste(dev, &ste);
+	return arm_smmu_attach_dev_ste(domain, dev, &ste);
 }
 
 static const struct iommu_domain_ops arm_smmu_blocked_ops = {
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
index 125b52ea5ad71c..ce01d3fc768ad6 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -758,10 +758,12 @@ void arm_smmu_make_abort_ste(struct arm_smmu_ste *target);
 void arm_smmu_make_bypass_ste(struct arm_smmu_device *smmu,
 			      struct arm_smmu_ste *target);
 void arm_smmu_make_cdtable_ste(struct arm_smmu_ste *target,
-			       struct arm_smmu_master *master);
+			       struct arm_smmu_master *master,
+			       bool ats_enabled);
 void arm_smmu_make_s2_domain_ste(struct arm_smmu_ste *target,
 				 struct arm_smmu_master *master,
-				 struct arm_smmu_domain *smmu_domain);
+				 struct arm_smmu_domain *smmu_domain,
+				 bool ats_enabled);
 void arm_smmu_make_sva_cd(struct arm_smmu_cd *target,
 			  struct arm_smmu_master *master, struct mm_struct *mm,
 			  u16 asid);
-- 
2.43.2


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Re: [PATCH v7 04/14] iommu/arm-smmu-v3: Make changing domains be hitless for ATS

[Nicolin Chen]

Hi Jason,

Overall this patch makes the driver look much cleaner. Just a
few small comments/nitpickings below.

On Wed, May 08, 2024 at 03:57:12PM -0300, Jason Gunthorpe wrote:


>  static void arm_smmu_v3_write_ste_test_s2_to_abort(struct kunit *test)
> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> index 532fe17f28bfe5..01e970f6ee4363 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c

> -static void arm_smmu_disable_ats(struct arm_smmu_master *master,
> -				 struct arm_smmu_domain *smmu_domain)
> -{
> -	if (!master->ats_enabled)
> -		return;
> -
> -	pci_disable_ats(to_pci_dev(master->dev));
> -	/*
> -	 * Ensure ATS is disabled at the endpoint before we issue the
> -	 * ATC invalidation via the SMMU.
> -	 */
> -	wmb();
> -	arm_smmu_atc_inv_master(master);
> -	atomic_dec(&smmu_domain->nr_ats_masters);
> -}
> -

Maybe we could keep the function for symmetry, since prepare()
still calls pci_disable_ats() + wmb()?

> +/*
> + * Prepare to attach a domain to a master. If disable_ats is not set this will
> + * turn on ATS if supported. smmu_domain can be NULL if the domain being

This function doesn't turn on ATS actually, but commit() does.

Should it be more accurate "If disable_ats is set this will turn
off ATS if enabled"?

> + * attached does not have a page table and does not require invalidation
> + * tracking.
> + */
> +static int arm_smmu_attach_prepare(struct arm_smmu_master *master,
> +				   struct iommu_domain *domain,
> +				   struct attach_state *state)
> +{
> +	struct arm_smmu_domain *smmu_domain =
> +		to_smmu_domain_devices(domain);

This could fit into a single line.

> -static int arm_smmu_attach_dev_ste(struct device *dev,
> -				   struct arm_smmu_ste *ste)
> +static int arm_smmu_attach_dev_ste(struct iommu_domain *domain,
> +				   struct device *dev, struct arm_smmu_ste *ste)

How about arm_smmu_domain_attach_dev_ste?

>  void arm_smmu_make_cdtable_ste(struct arm_smmu_ste *target,
> -			       struct arm_smmu_master *master);
> +			       struct arm_smmu_master *master,
> +			       bool ats_enabled);
>  void arm_smmu_make_s2_domain_ste(struct arm_smmu_ste *target,
>  				 struct arm_smmu_master *master,
> -				 struct arm_smmu_domain *smmu_domain);
> +				 struct arm_smmu_domain *smmu_domain,
> +				 bool ats_enabled);

We seem to pass state.want_ats all the time. So maybe just name
it "bool want_ats", given that "ats_enabled" is only true after
commit() that always comes after these two functions?

Thanks
Nicolin

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Re: [PATCH v7 04/14] iommu/arm-smmu-v3: Make changing domains be hitless for ATS

[Jason Gunthorpe]

On Sat, May 11, 2024 at 02:56:41PM -0700, Nicolin Chen wrote:
> >  static void arm_smmu_v3_write_ste_test_s2_to_abort(struct kunit *test)
> > diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> > index 532fe17f28bfe5..01e970f6ee4363 100644
> > --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> > +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> 
> > -static void arm_smmu_disable_ats(struct arm_smmu_master *master,
> > -				 struct arm_smmu_domain *smmu_domain)
> > -{
> > -	if (!master->ats_enabled)
> > -		return;
> > -
> > -	pci_disable_ats(to_pci_dev(master->dev));
> > -	/*
> > -	 * Ensure ATS is disabled at the endpoint before we issue the
> > -	 * ATC invalidation via the SMMU.
> > -	 */
> > -	wmb();
> > -	arm_smmu_atc_inv_master(master);
> > -	atomic_dec(&smmu_domain->nr_ats_masters);
> > -}
> > -
> 
> Maybe we could keep the function for symmetry, since prepare()
> still calls pci_disable_ats() + wmb()?

I removed it mainly because it is not symmetrical. On the disable
side the work enable does is split up between prepare and commit.

> > +/*
> > + * Prepare to attach a domain to a master. If disable_ats is not set this will
> > + * turn on ATS if supported. smmu_domain can be NULL if the domain being
> 
> This function doesn't turn on ATS actually, but commit() does.

Lets write a nicer comment:

/*
 * Start the sequence to attach a domain to a master. The sequence contains three
 * steps:
 *  arm_smmu_attach_prepare()
 *  arm_smmu_install_ste_for_dev()
 *  arm_smmu_attach_commit()
 *
 * If prepare succeeds then the sequence must be completed. The STE installed
 * must set the STE.EATS field according to state.ats_enabled.
 *
 * ATS is automatically enabled if the underlying device supports it.
 * disable_ats can inhibit this to support STEs like bypass that don't allow
 * ATS.
 *
 * The change of the EATS in the STE and the PCI ATS config space is managed by
 * this sequence to be in the right order such that if PCI ATS is enabled then
 * STE.ETAS is enabled.
 *
 * new_domain can be NULL if the domain being attached does not have a page
 * table and does not require invalidation tracking, and does not support ATS.
 */

> Should it be more accurate "If disable_ats is set this will turn
> off ATS if enabled"?

After looking a bit I removed disable_ats. We can now tell that ATS is
not possible because smmu_domain = NULL.

> > + * attached does not have a page table and does not require invalidation
> > + * tracking.
> > + */
> > +static int arm_smmu_attach_prepare(struct arm_smmu_master *master,
> > +				   struct iommu_domain *domain,
> > +				   struct attach_state *state)
> > +{
> > +	struct arm_smmu_domain *smmu_domain =
> > +		to_smmu_domain_devices(domain);
> 
> This could fit into a single line.

Done

> > -static int arm_smmu_attach_dev_ste(struct device *dev,
> > -				   struct arm_smmu_ste *ste)
> > +static int arm_smmu_attach_dev_ste(struct iommu_domain *domain,
> > +				   struct device *dev, struct arm_smmu_ste *ste)
> 
> How about arm_smmu_domain_attach_dev_ste?

It is reflecting the ops name 'iommu_domain_ops attach_dev'

> >  void arm_smmu_make_cdtable_ste(struct arm_smmu_ste *target,
> > -			       struct arm_smmu_master *master);
> > +			       struct arm_smmu_master *master,
> > +			       bool ats_enabled);
> >  void arm_smmu_make_s2_domain_ste(struct arm_smmu_ste *target,
> >  				 struct arm_smmu_master *master,
> > -				 struct arm_smmu_domain *smmu_domain);
> > +				 struct arm_smmu_domain *smmu_domain,
> > +				 bool ats_enabled);
> 
> We seem to pass state.want_ats all the time. So maybe just name
> it "bool want_ats", given that "ats_enabled" is only true after
> commit() that always comes after these two functions?

Lets rename want_ats to ats_enabled to have a consistent name.

Jason

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[PATCH v7 05/14] iommu/arm-smmu-v3: Add ssid to struct arm_smmu_master_domain

[Jason Gunthorpe]

Prepare to allow a S1 domain to be attached to a PASID as well. Keep track
of the SSID the domain is using on each master in the
arm_smmu_master_domain.

Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Reviewed-by: Michael Shavit <mshavit@google.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c   | 15 ++++---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c   | 42 +++++++++++++++----
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h   |  5 ++-
 3 files changed, 43 insertions(+), 19 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
index cb3a0e4143c84a..d31caceb584984 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
@@ -47,13 +47,12 @@ arm_smmu_update_s1_domain_cd_entry(struct arm_smmu_domain *smmu_domain)
 		struct arm_smmu_master *master = master_domain->master;
 		struct arm_smmu_cd *cdptr;
 
-		/* S1 domains only support RID attachment right now */
-		cdptr = arm_smmu_get_cd_ptr(master, IOMMU_NO_PASID);
+		cdptr = arm_smmu_get_cd_ptr(master, master_domain->ssid);
 		if (WARN_ON(!cdptr))
 			continue;
 
 		arm_smmu_make_s1_cd(&target_cd, master, smmu_domain);
-		arm_smmu_write_cd_entry(master, IOMMU_NO_PASID, cdptr,
+		arm_smmu_write_cd_entry(master, master_domain->ssid, cdptr,
 					&target_cd);
 	}
 	spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
@@ -294,8 +293,8 @@ static void arm_smmu_mm_arch_invalidate_secondary_tlbs(struct mmu_notifier *mn,
 						    smmu_domain);
 	}
 
-	arm_smmu_atc_inv_domain(smmu_domain, mm_get_enqcmd_pasid(mm), start,
-				size);
+	arm_smmu_atc_inv_domain_sva(smmu_domain, mm_get_enqcmd_pasid(mm), start,
+				    size);
 }
 
 static void arm_smmu_mm_release(struct mmu_notifier *mn, struct mm_struct *mm)
@@ -332,7 +331,7 @@ static void arm_smmu_mm_release(struct mmu_notifier *mn, struct mm_struct *mm)
 	spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
 
 	arm_smmu_tlb_inv_asid(smmu_domain->smmu, smmu_mn->cd->asid);
-	arm_smmu_atc_inv_domain(smmu_domain, mm_get_enqcmd_pasid(mm), 0, 0);
+	arm_smmu_atc_inv_domain_sva(smmu_domain, mm_get_enqcmd_pasid(mm), 0, 0);
 
 	smmu_mn->cleared = true;
 	mutex_unlock(&sva_lock);
@@ -411,8 +410,8 @@ static void arm_smmu_mmu_notifier_put(struct arm_smmu_mmu_notifier *smmu_mn)
 	 */
 	if (!smmu_mn->cleared) {
 		arm_smmu_tlb_inv_asid(smmu_domain->smmu, cd->asid);
-		arm_smmu_atc_inv_domain(smmu_domain, mm_get_enqcmd_pasid(mm), 0,
-					0);
+		arm_smmu_atc_inv_domain_sva(smmu_domain,
+					    mm_get_enqcmd_pasid(mm), 0, 0);
 	}
 
 	/* Frees smmu_mn */
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 01e970f6ee4363..3a7ef73994b57b 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2013,8 +2013,8 @@ static int arm_smmu_atc_inv_master(struct arm_smmu_master *master)
 	return arm_smmu_cmdq_batch_submit(master->smmu, &cmds);
 }
 
-int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain, int ssid,
-			    unsigned long iova, size_t size)
+static int __arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain,
+				     ioasid_t ssid, unsigned long iova, size_t size)
 {
 	struct arm_smmu_master_domain *master_domain;
 	int i;
@@ -2042,8 +2042,6 @@ int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain, int ssid,
 	if (!atomic_read(&smmu_domain->nr_ats_masters))
 		return 0;
 
-	arm_smmu_atc_inv_to_cmd(ssid, iova, size, &cmd);
-
 	cmds.num = 0;
 
 	spin_lock_irqsave(&smmu_domain->devices_lock, flags);
@@ -2054,6 +2052,16 @@ int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain, int ssid,
 		if (!master->ats_enabled)
 			continue;
 
+		/*
+		 * Non-zero ssid means SVA is co-opting the S1 domain to issue
+		 * invalidations for SVA PASIDs.
+		 */
+		if (ssid != IOMMU_NO_PASID)
+			arm_smmu_atc_inv_to_cmd(ssid, iova, size, &cmd);
+		else
+			arm_smmu_atc_inv_to_cmd(master_domain->ssid, iova, size,
+						&cmd);
+
 		for (i = 0; i < master->num_streams; i++) {
 			cmd.atc.sid = master->streams[i].id;
 			arm_smmu_cmdq_batch_add(smmu_domain->smmu, &cmds, &cmd);
@@ -2064,6 +2072,19 @@ int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain, int ssid,
 	return arm_smmu_cmdq_batch_submit(smmu_domain->smmu, &cmds);
 }
 
+static int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain,
+				   unsigned long iova, size_t size)
+{
+	return __arm_smmu_atc_inv_domain(smmu_domain, IOMMU_NO_PASID, iova,
+					 size);
+}
+
+int arm_smmu_atc_inv_domain_sva(struct arm_smmu_domain *smmu_domain,
+				ioasid_t ssid, unsigned long iova, size_t size)
+{
+	return __arm_smmu_atc_inv_domain(smmu_domain, ssid, iova, size);
+}
+
 /* IO_PGTABLE API */
 static void arm_smmu_tlb_inv_context(void *cookie)
 {
@@ -2085,7 +2106,7 @@ static void arm_smmu_tlb_inv_context(void *cookie)
 		cmd.tlbi.vmid	= smmu_domain->s2_cfg.vmid;
 		arm_smmu_cmdq_issue_cmd_with_sync(smmu, &cmd);
 	}
-	arm_smmu_atc_inv_domain(smmu_domain, IOMMU_NO_PASID, 0, 0);
+	arm_smmu_atc_inv_domain(smmu_domain, 0, 0);
 }
 
 static void __arm_smmu_tlb_inv_range(struct arm_smmu_cmdq_ent *cmd,
@@ -2183,7 +2204,7 @@ static void arm_smmu_tlb_inv_range_domain(unsigned long iova, size_t size,
 	 * Unfortunately, this can't be leaf-only since we may have
 	 * zapped an entire table.
 	 */
-	arm_smmu_atc_inv_domain(smmu_domain, IOMMU_NO_PASID, iova, size);
+	arm_smmu_atc_inv_domain(smmu_domain, iova, size);
 }
 
 void arm_smmu_tlb_inv_range_asid(unsigned long iova, size_t size, int asid,
@@ -2518,7 +2539,8 @@ static void arm_smmu_disable_pasid(struct arm_smmu_master *master)
 
 static struct arm_smmu_master_domain *
 arm_smmu_find_master_domain(struct arm_smmu_domain *smmu_domain,
-			    struct arm_smmu_master *master)
+			    struct arm_smmu_master *master,
+			    ioasid_t ssid)
 {
 	struct arm_smmu_master_domain *master_domain;
 
@@ -2526,7 +2548,8 @@ arm_smmu_find_master_domain(struct arm_smmu_domain *smmu_domain,
 
 	list_for_each_entry(master_domain, &smmu_domain->devices,
 			    devices_elm) {
-		if (master_domain->master == master)
+		if (master_domain->master == master &&
+		    master_domain->ssid == ssid)
 			return master_domain;
 	}
 	return NULL;
@@ -2559,7 +2582,8 @@ static void arm_smmu_remove_master_domain(struct arm_smmu_master *master,
 		return;
 
 	spin_lock_irqsave(&smmu_domain->devices_lock, flags);
-	master_domain = arm_smmu_find_master_domain(smmu_domain, master);
+	master_domain = arm_smmu_find_master_domain(smmu_domain, master,
+						    IOMMU_NO_PASID);
 	if (master_domain) {
 		list_del(&master_domain->devices_elm);
 		kfree(master_domain);
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
index ce01d3fc768ad6..23d8a5b7912069 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -772,6 +772,7 @@ void arm_smmu_make_sva_cd(struct arm_smmu_cd *target,
 struct arm_smmu_master_domain {
 	struct list_head devices_elm;
 	struct arm_smmu_master *master;
+	ioasid_t ssid;
 };
 
 static inline struct arm_smmu_domain *to_smmu_domain(struct iommu_domain *dom)
@@ -803,8 +804,8 @@ void arm_smmu_tlb_inv_range_asid(unsigned long iova, size_t size, int asid,
 				 size_t granule, bool leaf,
 				 struct arm_smmu_domain *smmu_domain);
 bool arm_smmu_free_asid(struct arm_smmu_ctx_desc *cd);
-int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain, int ssid,
-			    unsigned long iova, size_t size);
+int arm_smmu_atc_inv_domain_sva(struct arm_smmu_domain *smmu_domain,
+				ioasid_t ssid, unsigned long iova, size_t size);
 
 #ifdef CONFIG_ARM_SMMU_V3_SVA
 bool arm_smmu_sva_supported(struct arm_smmu_device *smmu);
-- 
2.43.2


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Re: [PATCH v7 05/14] iommu/arm-smmu-v3: Add ssid to struct arm_smmu_master_domain

[Nicolin Chen]

On Wed, May 08, 2024 at 03:57:13PM -0300, Jason Gunthorpe wrote:
> Prepare to allow a S1 domain to be attached to a PASID as well. Keep track
> of the SSID the domain is using on each master in the
> arm_smmu_master_domain.
> 
> Tested-by: Nicolin Chen <nicolinc@nvidia.com>
> Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
> Reviewed-by: Michael Shavit <mshavit@google.com>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>

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[PATCH v7 06/14] iommu/arm-smmu-v3: Do not use master->sva_enable to restrict attaches

[Jason Gunthorpe]

We no longer need a master->sva_enable to control what attaches are
allowed. Instead we can tell if the attach is legal based on the current
configuration of the master.

Keep track of the number of valid CD entries for SSID's in the cd_table
and if the cd_table has been installed in the STE directly so we know what
the configuration is.

The attach logic is then made into:
 - SVA bind, check if the CD is installed
 - RID attach of S2, block if SSIDs are used
 - RID attach of IDENTITY/BLOCKING, block if SSIDs are used

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c   |  2 +-
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c   | 24 +++++++++----------
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h   |  7 ++++++
 3 files changed, 20 insertions(+), 13 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
index d31caceb584984..7627cb53da55b9 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
@@ -628,7 +628,7 @@ static int arm_smmu_sva_set_dev_pasid(struct iommu_domain *domain,
 	struct arm_smmu_cd target;
 	int ret;
 
-	if (mm_get_enqcmd_pasid(mm) != id)
+	if (mm_get_enqcmd_pasid(mm) != id || !master->cd_table.in_ste)
 		return -EINVAL;
 
 	mutex_lock(&sva_lock);
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 3a7ef73994b57b..5f418b96679c88 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -1289,6 +1289,8 @@ void arm_smmu_write_cd_entry(struct arm_smmu_master *master, int ssid,
 			     struct arm_smmu_cd *cdptr,
 			     const struct arm_smmu_cd *target)
 {
+	bool target_valid = target->data[0] & cpu_to_le64(CTXDESC_CD_0_V);
+	bool cur_valid = cdptr->data[0] & cpu_to_le64(CTXDESC_CD_0_V);
 	struct arm_smmu_cd_writer cd_writer = {
 		.writer = {
 			.ops = &arm_smmu_cd_writer_ops,
@@ -1297,6 +1299,13 @@ void arm_smmu_write_cd_entry(struct arm_smmu_master *master, int ssid,
 		.ssid = ssid,
 	};
 
+	if (ssid != IOMMU_NO_PASID && cur_valid != target_valid) {
+		if (cur_valid)
+			master->cd_table.used_ssids--;
+		else
+			master->cd_table.used_ssids++;
+	}
+
 	arm_smmu_write_entry(&cd_writer.writer, cdptr->data, target->data);
 }
 
@@ -2706,16 +2715,6 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
 	master = dev_iommu_priv_get(dev);
 	smmu = master->smmu;
 
-	/*
-	 * Checking that SVA is disabled ensures that this device isn't bound to
-	 * any mm, and can be safely detached from its old domain. Bonds cannot
-	 * be removed concurrently since we're holding the group mutex.
-	 */
-	if (arm_smmu_master_sva_enabled(master)) {
-		dev_err(dev, "cannot attach - SVA enabled\n");
-		return -EBUSY;
-	}
-
 	mutex_lock(&smmu_domain->init_mutex);
 
 	if (!smmu_domain->smmu) {
@@ -2731,7 +2730,8 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
 		cdptr = arm_smmu_alloc_cd_ptr(master, IOMMU_NO_PASID);
 		if (!cdptr)
 			return -ENOMEM;
-	}
+	} else if (arm_smmu_ssids_in_use(&master->cd_table))
+		return -EBUSY;
 
 	/*
 	 * Prevent arm_smmu_share_asid() from trying to change the ASID
@@ -2803,7 +2803,7 @@ static int arm_smmu_attach_dev_ste(struct iommu_domain *domain,
 		.old_domain = iommu_get_domain_for_dev(dev),
 	};
 
-	if (arm_smmu_master_sva_enabled(master))
+	if (arm_smmu_ssids_in_use(&master->cd_table))
 		return -EBUSY;
 
 	/*
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
index 23d8a5b7912069..e850b7913e67a1 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -602,12 +602,19 @@ struct arm_smmu_ctx_desc_cfg {
 	dma_addr_t			cdtab_dma;
 	struct arm_smmu_l1_ctx_desc	*l1_desc;
 	unsigned int			num_l1_ents;
+	unsigned int			used_ssids;
 	u8				in_ste;
 	u8				s1fmt;
 	/* log2 of the maximum number of CDs supported by this table */
 	u8				s1cdmax;
 };
 
+/* True if the cd table has SSIDS > 0 in use. */
+static inline bool arm_smmu_ssids_in_use(struct arm_smmu_ctx_desc_cfg *cd_table)
+{
+	return cd_table->used_ssids;
+}
+
 struct arm_smmu_s2_cfg {
 	u16				vmid;
 };
-- 
2.43.2


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Re: [PATCH v7 06/14] iommu/arm-smmu-v3: Do not use master->sva_enable to restrict attaches

[Nicolin Chen]

On Wed, May 08, 2024 at 03:57:14PM -0300, Jason Gunthorpe wrote:
> We no longer need a master->sva_enable to control what attaches are
> allowed. Instead we can tell if the attach is legal based on the current
> configuration of the master.
> 
> Keep track of the number of valid CD entries for SSID's in the cd_table
> and if the cd_table has been installed in the STE directly so we know what
> the configuration is.
> 
> The attach logic is then made into:
>  - SVA bind, check if the CD is installed
>  - RID attach of S2, block if SSIDs are used
>  - RID attach of IDENTITY/BLOCKING, block if SSIDs are used
> 
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> ---
>  .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c   |  2 +-
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c   | 24 +++++++++----------
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h   |  7 ++++++
>  3 files changed, 20 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
> index d31caceb584984..7627cb53da55b9 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
> @@ -628,7 +628,7 @@ static int arm_smmu_sva_set_dev_pasid(struct iommu_domain *domain,
>  	struct arm_smmu_cd target;
>  	int ret;
>  
> -	if (mm_get_enqcmd_pasid(mm) != id)
> +	if (mm_get_enqcmd_pasid(mm) != id || !master->cd_table.in_ste)
>  		return -EINVAL;

The in_ste is added in PATCH-2 and the new arm_smmu_set_pasid()
in the same patch is also guarded by the in_ste. So, it feels a
little more related by moving this check here into PATCH-2 too?

Thanks
Nicolin

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Re: [PATCH v7 06/14] iommu/arm-smmu-v3: Do not use master->sva_enable to restrict attaches

[Nicolin Chen]

On Sun, May 12, 2024 at 11:01:32PM -0700, Nicolin Chen wrote:
> On Wed, May 08, 2024 at 03:57:14PM -0300, Jason Gunthorpe wrote:
> > We no longer need a master->sva_enable to control what attaches are
> > allowed. Instead we can tell if the attach is legal based on the current
> > configuration of the master.
> > 
> > Keep track of the number of valid CD entries for SSID's in the cd_table
> > and if the cd_table has been installed in the STE directly so we know what
> > the configuration is.
> > 
> > The attach logic is then made into:
> >  - SVA bind, check if the CD is installed
> >  - RID attach of S2, block if SSIDs are used
> >  - RID attach of IDENTITY/BLOCKING, block if SSIDs are used
> > 
> > Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> > ---
> >  .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c   |  2 +-
> >  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c   | 24 +++++++++----------
> >  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h   |  7 ++++++
> >  3 files changed, 20 insertions(+), 13 deletions(-)
> > 
> > diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
> > index d31caceb584984..7627cb53da55b9 100644
> > --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
> > +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
> > @@ -628,7 +628,7 @@ static int arm_smmu_sva_set_dev_pasid(struct iommu_domain *domain,
> >  	struct arm_smmu_cd target;
> >  	int ret;
> >  
> > -	if (mm_get_enqcmd_pasid(mm) != id)
> > +	if (mm_get_enqcmd_pasid(mm) != id || !master->cd_table.in_ste)
> >  		return -EINVAL;
> 
> The in_ste is added in PATCH-2 and the new arm_smmu_set_pasid()
> in the same patch is also guarded by the in_ste. So, it feels a
> little more related by moving this check here into PATCH-2 too?

Actually, I found this in_ste sanity gets removed in PATCH-10.
I assume we rely on the same sanity in the arm_smmu_set_pasid()
instead?

If so, this sanity exists already in the arm_smmu_set_pasid()
in the code that this patch applies to. So, could we just start
to rely on that here, instead of adding this additional in_ste
sanity in this patch?

Thanks
Nicolin

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Re: [PATCH v7 06/14] iommu/arm-smmu-v3: Do not use master->sva_enable to restrict attaches

[Jason Gunthorpe]

On Sun, May 12, 2024 at 11:01:19PM -0700, Nicolin Chen wrote:

> > diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
> > index d31caceb584984..7627cb53da55b9 100644
> > --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
> > +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
> > @@ -628,7 +628,7 @@ static int arm_smmu_sva_set_dev_pasid(struct iommu_domain *domain,
> >  	struct arm_smmu_cd target;
> >  	int ret;
> >  
> > -	if (mm_get_enqcmd_pasid(mm) != id)
> > +	if (mm_get_enqcmd_pasid(mm) != id || !master->cd_table.in_ste)
> >  		return -EINVAL;
> 
> The in_ste is added in PATCH-2 and the new arm_smmu_set_pasid()
> in the same patch is also guarded by the in_ste. So, it feels a
> little more related by moving this check here into PATCH-2 too?

Hmm, actually I think we can just remove this hunk now. The
arm_smmu_set_pasid() a few lines below will check this already. It was
here because before I didn't have the error unwind for
arm_smmu_set_pasid() failure. Now that we have it we can just delete
this.

Thanks,
Jason

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Re: [PATCH v7 06/14] iommu/arm-smmu-v3: Do not use master->sva_enable to restrict attaches

[Nicolin Chen]

On Wed, May 08, 2024 at 03:57:14PM -0300, Jason Gunthorpe wrote:
> We no longer need a master->sva_enable to control what attaches are
> allowed. Instead we can tell if the attach is legal based on the current
> configuration of the master.
> 
> Keep track of the number of valid CD entries for SSID's in the cd_table
> and if the cd_table has been installed in the STE directly so we know what
> the configuration is.
> 
> The attach logic is then made into:
>  - SVA bind, check if the CD is installed
>  - RID attach of S2, block if SSIDs are used
>  - RID attach of IDENTITY/BLOCKING, block if SSIDs are used
> 
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

With that in_ste check removed,

Reviewed-y: Nicolin Chen <nicolinc@nvidia.com>

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[PATCH v7 07/14] iommu/arm-smmu-v3: Thread SSID through the arm_smmu_attach_*() interface

[Jason Gunthorpe]

Allow creating and managing arm_smmu_mater_domain's with a non-zero SSID
through the arm_smmu_attach_*() family of functions. This triggers ATC
invalidation for the correct SSID in PASID cases and tracks the
per-attachment SSID in the struct arm_smmu_master_domain.

Generalize arm_smmu_attach_remove() to be able to remove SSID's as well by
ensuring the ATC for the PASID is flushed properly.

Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 24 ++++++++++++++-------
 1 file changed, 16 insertions(+), 8 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 5f418b96679c88..b2d8b7a1df343a 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2005,13 +2005,14 @@ arm_smmu_atc_inv_to_cmd(int ssid, unsigned long iova, size_t size,
 	cmd->atc.size	= log2_span;
 }
 
-static int arm_smmu_atc_inv_master(struct arm_smmu_master *master)
+static int arm_smmu_atc_inv_master(struct arm_smmu_master *master,
+				   ioasid_t ssid)
 {
 	int i;
 	struct arm_smmu_cmdq_ent cmd;
 	struct arm_smmu_cmdq_batch cmds;
 
-	arm_smmu_atc_inv_to_cmd(IOMMU_NO_PASID, 0, 0, &cmd);
+	arm_smmu_atc_inv_to_cmd(ssid, 0, 0, &cmd);
 
 	cmds.num = 0;
 	for (i = 0; i < master->num_streams; i++) {
@@ -2494,7 +2495,7 @@ static void arm_smmu_enable_ats(struct arm_smmu_master *master)
 	/*
 	 * ATC invalidation of PASID 0 causes the entire ATC to be flushed.
 	 */
-	arm_smmu_atc_inv_master(master);
+	arm_smmu_atc_inv_master(master, IOMMU_NO_PASID);
 	if (pci_enable_ats(pdev, stu))
 		dev_err(master->dev, "Failed to enable ATS (STU %zu)\n", stu);
 }
@@ -2581,7 +2582,8 @@ to_smmu_domain_devices(struct iommu_domain *domain)
 }
 
 static void arm_smmu_remove_master_domain(struct arm_smmu_master *master,
-					  struct iommu_domain *domain)
+					  struct iommu_domain *domain,
+					  ioasid_t ssid)
 {
 	struct arm_smmu_domain *smmu_domain = to_smmu_domain_devices(domain);
 	struct arm_smmu_master_domain *master_domain;
@@ -2591,8 +2593,7 @@ static void arm_smmu_remove_master_domain(struct arm_smmu_master *master,
 		return;
 
 	spin_lock_irqsave(&smmu_domain->devices_lock, flags);
-	master_domain = arm_smmu_find_master_domain(smmu_domain, master,
-						    IOMMU_NO_PASID);
+	master_domain = arm_smmu_find_master_domain(smmu_domain, master, ssid);
 	if (master_domain) {
 		list_del(&master_domain->devices_elm);
 		kfree(master_domain);
@@ -2606,6 +2607,7 @@ struct attach_state {
 	bool want_ats;
 	bool disable_ats;
 	struct iommu_domain *old_domain;
+	ioasid_t ssid;
 };
 
 /*
@@ -2637,6 +2639,7 @@ static int arm_smmu_attach_prepare(struct arm_smmu_master *master,
 		if (!master_domain)
 			return -ENOMEM;
 		master_domain->master = master;
+		master_domain->ssid = state->ssid;
 
 		/*
 		 * During prepare we want the current smmu_domain and new
@@ -2689,11 +2692,14 @@ static void arm_smmu_attach_commit(struct arm_smmu_master *master,
 		 * SMMU is translating for the new domain and both the old&new
 		 * domain will issue invalidations.
 		 */
-		arm_smmu_atc_inv_master(master);
+		if (state->want_ats)
+			arm_smmu_atc_inv_master(master, state->ssid);
+		else
+			arm_smmu_atc_inv_master(master, IOMMU_NO_PASID);
 	}
 	master->ats_enabled = state->want_ats;
 
-	arm_smmu_remove_master_domain(master, state->old_domain);
+	arm_smmu_remove_master_domain(master, state->old_domain, state->ssid);
 }
 
 static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
@@ -2705,6 +2711,7 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
 	struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
 	struct attach_state state = {
 		.old_domain = iommu_get_domain_for_dev(dev),
+		.ssid = IOMMU_NO_PASID,
 	};
 	struct arm_smmu_master *master;
 	struct arm_smmu_cd *cdptr;
@@ -2801,6 +2808,7 @@ static int arm_smmu_attach_dev_ste(struct iommu_domain *domain,
 	struct arm_smmu_master *master = dev_iommu_priv_get(dev);
 	struct attach_state state = {
 		.old_domain = iommu_get_domain_for_dev(dev),
+		.ssid = IOMMU_NO_PASID,
 	};
 
 	if (arm_smmu_ssids_in_use(&master->cd_table))
-- 
2.43.2


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Re: [PATCH v7 07/14] iommu/arm-smmu-v3: Thread SSID through the arm_smmu_attach_*() interface

[Nicolin Chen]

On Wed, May 08, 2024 at 03:57:15PM -0300, Jason Gunthorpe wrote:
> Allow creating and managing arm_smmu_mater_domain's with a non-zero SSID
> through the arm_smmu_attach_*() family of functions. This triggers ATC
> invalidation for the correct SSID in PASID cases and tracks the
> per-attachment SSID in the struct arm_smmu_master_domain.
> 
> Generalize arm_smmu_attach_remove() to be able to remove SSID's as well by
> ensuring the ATC for the PASID is flushed properly.
> 
> Tested-by: Nicolin Chen <nicolinc@nvidia.com>
> Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>

> @@ -2689,11 +2692,14 @@ static void arm_smmu_attach_commit(struct arm_smmu_master *master,
>  		 * SMMU is translating for the new domain and both the old&new
>  		 * domain will issue invalidations.
>  		 */
> -		arm_smmu_atc_inv_master(master);
> +		if (state->want_ats)
> +			arm_smmu_atc_inv_master(master, state->ssid);

Just trying to confirm my understanding here:

In the arm_smmu_set_pasid pathway, ssid is a valid pasid. So,
here we invalidate both new and old master_domains using the
same ssid/pasid, if either of them occupies the same cd entry.

And...

> -	arm_smmu_remove_master_domain(master, state->old_domain);
> +	arm_smmu_remove_master_domain(master, state->old_domain, state->ssid);

then we remove the old one here.

Though the flow makes sense to me, yet I wonder if there can be
such a use case like this where an old master_domain is holding
the same cd entry as the one wanted by the new master_domain?

Thanks
Nicolin

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Re: [PATCH v7 07/14] iommu/arm-smmu-v3: Thread SSID through the arm_smmu_attach_*() interface

[Jason Gunthorpe]

On Sun, May 12, 2024 at 11:32:53PM -0700, Nicolin Chen wrote:
> On Wed, May 08, 2024 at 03:57:15PM -0300, Jason Gunthorpe wrote:
> > Allow creating and managing arm_smmu_mater_domain's with a non-zero SSID
> > through the arm_smmu_attach_*() family of functions. This triggers ATC
> > invalidation for the correct SSID in PASID cases and tracks the
> > per-attachment SSID in the struct arm_smmu_master_domain.
> > 
> > Generalize arm_smmu_attach_remove() to be able to remove SSID's as well by
> > ensuring the ATC for the PASID is flushed properly.
> > 
> > Tested-by: Nicolin Chen <nicolinc@nvidia.com>
> > Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
> > Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> 
> Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
> 
> > @@ -2689,11 +2692,14 @@ static void arm_smmu_attach_commit(struct arm_smmu_master *master,
> >  		 * SMMU is translating for the new domain and both the old&new
> >  		 * domain will issue invalidations.
> >  		 */
> > -		arm_smmu_atc_inv_master(master);
> > +		if (state->want_ats)
> > +			arm_smmu_atc_inv_master(master, state->ssid);
> 
> Just trying to confirm my understanding here:
> 
> In the arm_smmu_set_pasid pathway, ssid is a valid pasid. So,
> here we invalidate both new and old master_domains using the
> same ssid/pasid, if either of them occupies the same cd entry.

Yes.

> And...
> 
> > -	arm_smmu_remove_master_domain(master, state->old_domain);
> > +	arm_smmu_remove_master_domain(master, state->old_domain, state->ssid);
> 
> then we remove the old one here.
> 
> Though the flow makes sense to me, yet I wonder if there can be
> such a use case like this where an old master_domain is holding
> the same cd entry as the one wanted by the new master_domain?

It could happen, the API allows it, and the short lived double
invalidation is a trade off to allow loose locking on the invalidation
side. For this kind of thing we want to make the common case of
invalidation to run fast.

Jason

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[PATCH v7 08/14] iommu/arm-smmu-v3: Make SVA allocate a normal arm_smmu_domain

[Jason Gunthorpe]

Currently the SVA domain is a naked struct iommu_domain, allocate a struct
arm_smmu_domain instead.

This is necessary to be able to use the struct arm_master_domain
mechanism.

Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Reviewed-by: Michael Shavit <mshavit@google.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c   | 21 +++++++------
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c   | 31 +++++++++++++------
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h   |  2 ++
 3 files changed, 35 insertions(+), 19 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
index 7627cb53da55b9..39ba6766513457 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
@@ -639,7 +639,7 @@ static int arm_smmu_sva_set_dev_pasid(struct iommu_domain *domain,
 	}
 
 	arm_smmu_make_sva_cd(&target, master, mm, bond->smmu_mn->cd->asid);
-	ret = arm_smmu_set_pasid(master, NULL, id, &target);
+	ret = arm_smmu_set_pasid(master, to_smmu_domain(domain), id, &target);
 	if (ret) {
 		list_del(&bond->list);
 		arm_smmu_mmu_notifier_put(bond->smmu_mn);
@@ -653,7 +653,7 @@ static int arm_smmu_sva_set_dev_pasid(struct iommu_domain *domain,
 
 static void arm_smmu_sva_domain_free(struct iommu_domain *domain)
 {
-	kfree(domain);
+	kfree(to_smmu_domain(domain));
 }
 
 static const struct iommu_domain_ops arm_smmu_sva_domain_ops = {
@@ -664,13 +664,16 @@ static const struct iommu_domain_ops arm_smmu_sva_domain_ops = {
 struct iommu_domain *arm_smmu_sva_domain_alloc(struct device *dev,
 					       struct mm_struct *mm)
 {
-	struct iommu_domain *domain;
+	struct arm_smmu_master *master = dev_iommu_priv_get(dev);
+	struct arm_smmu_device *smmu = master->smmu;
+	struct arm_smmu_domain *smmu_domain;
 
-	domain = kzalloc(sizeof(*domain), GFP_KERNEL);
-	if (!domain)
-		return ERR_PTR(-ENOMEM);
-	domain->type = IOMMU_DOMAIN_SVA;
-	domain->ops = &arm_smmu_sva_domain_ops;
+	smmu_domain = arm_smmu_domain_alloc();
+	if (IS_ERR(smmu_domain))
+		return ERR_CAST(smmu_domain);
+	smmu_domain->domain.type = IOMMU_DOMAIN_SVA;
+	smmu_domain->domain.ops = &arm_smmu_sva_domain_ops;
+	smmu_domain->smmu = smmu;
 
-	return domain;
+	return &smmu_domain->domain;
 }
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index b2d8b7a1df343a..3011eb10763bee 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2272,6 +2272,22 @@ static bool arm_smmu_capable(struct device *dev, enum iommu_cap cap)
 	}
 }
 
+struct arm_smmu_domain *arm_smmu_domain_alloc(void)
+{
+	struct arm_smmu_domain *smmu_domain;
+
+	smmu_domain = kzalloc(sizeof(*smmu_domain), GFP_KERNEL);
+	if (!smmu_domain)
+		return ERR_PTR(-ENOMEM);
+
+	mutex_init(&smmu_domain->init_mutex);
+	INIT_LIST_HEAD(&smmu_domain->devices);
+	spin_lock_init(&smmu_domain->devices_lock);
+	INIT_LIST_HEAD(&smmu_domain->mmu_notifiers);
+
+	return smmu_domain;
+}
+
 static struct iommu_domain *arm_smmu_domain_alloc_paging(struct device *dev)
 {
 	struct arm_smmu_domain *smmu_domain;
@@ -2281,14 +2297,9 @@ static struct iommu_domain *arm_smmu_domain_alloc_paging(struct device *dev)
 	 * We can't really do anything meaningful until we've added a
 	 * master.
 	 */
-	smmu_domain = kzalloc(sizeof(*smmu_domain), GFP_KERNEL);
-	if (!smmu_domain)
-		return ERR_PTR(-ENOMEM);
-
-	mutex_init(&smmu_domain->init_mutex);
-	INIT_LIST_HEAD(&smmu_domain->devices);
-	spin_lock_init(&smmu_domain->devices_lock);
-	INIT_LIST_HEAD(&smmu_domain->mmu_notifiers);
+	smmu_domain = arm_smmu_domain_alloc();
+	if (IS_ERR(smmu_domain))
+		return ERR_CAST(smmu_domain);
 
 	if (dev) {
 		struct arm_smmu_master *master = dev_iommu_priv_get(dev);
@@ -2303,7 +2314,7 @@ static struct iommu_domain *arm_smmu_domain_alloc_paging(struct device *dev)
 	return &smmu_domain->domain;
 }
 
-static void arm_smmu_domain_free(struct iommu_domain *domain)
+static void arm_smmu_domain_free_paging(struct iommu_domain *domain)
 {
 	struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
 	struct arm_smmu_device *smmu = smmu_domain->smmu;
@@ -3285,7 +3296,7 @@ static struct iommu_ops arm_smmu_ops = {
 		.iotlb_sync		= arm_smmu_iotlb_sync,
 		.iova_to_phys		= arm_smmu_iova_to_phys,
 		.enable_nesting		= arm_smmu_enable_nesting,
-		.free			= arm_smmu_domain_free,
+		.free			= arm_smmu_domain_free_paging,
 	}
 };
 
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
index e850b7913e67a1..a036610e50da14 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -790,6 +790,8 @@ static inline struct arm_smmu_domain *to_smmu_domain(struct iommu_domain *dom)
 extern struct xarray arm_smmu_asid_xa;
 extern struct mutex arm_smmu_asid_lock;
 
+struct arm_smmu_domain *arm_smmu_domain_alloc(void);
+
 void arm_smmu_clear_cd(struct arm_smmu_master *master, ioasid_t ssid);
 struct arm_smmu_cd *arm_smmu_get_cd_ptr(struct arm_smmu_master *master,
 					u32 ssid);
-- 
2.43.2


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Re: [PATCH v7 08/14] iommu/arm-smmu-v3: Make SVA allocate a normal arm_smmu_domain

[Nicolin Chen]

On Wed, May 08, 2024 at 03:57:16PM -0300, Jason Gunthorpe wrote:
> Currently the SVA domain is a naked struct iommu_domain, allocate a struct
> arm_smmu_domain instead.
> 
> This is necessary to be able to use the struct arm_master_domain
> mechanism.
> 
> Tested-by: Nicolin Chen <nicolinc@nvidia.com>
> Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
> Reviewed-by: Michael Shavit <mshavit@google.com>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>

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[PATCH v7 09/14] iommu/arm-smmu-v3: Keep track of arm_smmu_master_domain for SVA

[Jason Gunthorpe]

Fill in the smmu_domain->devices list in the new struct arm_smmu_domain
that SVA allocates. Keep track of every SSID and master that is using the
domain reusing the logic for the RID attach.

This is the first step to making the SVA invalidation follow the same
design as S1/S2 invalidation. At present nothing will read this list.

Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 29 +++++++++++++++++++--
 1 file changed, 27 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 3011eb10763bee..020e4efdf8fc06 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2587,7 +2587,8 @@ to_smmu_domain_devices(struct iommu_domain *domain)
 	/* The domain can be NULL only when processing the first attach */
 	if (!domain)
 		return NULL;
-	if (domain->type & __IOMMU_DOMAIN_PAGING)
+	if ((domain->type & __IOMMU_DOMAIN_PAGING) ||
+	    domain->type == IOMMU_DOMAIN_SVA)
 		return to_smmu_domain(domain);
 	return NULL;
 }
@@ -2793,7 +2794,15 @@ int arm_smmu_set_pasid(struct arm_smmu_master *master,
 		       struct arm_smmu_domain *smmu_domain, ioasid_t pasid,
 		       const struct arm_smmu_cd *cd)
 {
+	struct attach_state state = {
+		/*
+		 * For now the core code prevents calling this when a domain is
+		 * already attached, no need to set old_domain.
+		 */
+		.ssid = pasid,
+	};
 	struct arm_smmu_cd *cdptr;
+	int ret;
 
 	/* The core code validates pasid */
 
@@ -2803,14 +2812,30 @@ int arm_smmu_set_pasid(struct arm_smmu_master *master,
 	cdptr = arm_smmu_alloc_cd_ptr(master, pasid);
 	if (!cdptr)
 		return -ENOMEM;
+
+	mutex_lock(&arm_smmu_asid_lock);
+	ret = arm_smmu_attach_prepare(master, &smmu_domain->domain, &state);
+	if (ret)
+		goto out_unlock;
+
 	arm_smmu_write_cd_entry(master, pasid, cdptr, cd);
-	return 0;
+
+	arm_smmu_attach_commit(master, &state);
+
+out_unlock:
+	mutex_unlock(&arm_smmu_asid_lock);
+	return ret;
 }
 
 void arm_smmu_remove_pasid(struct arm_smmu_master *master,
 			   struct arm_smmu_domain *smmu_domain, ioasid_t pasid)
 {
+	mutex_lock(&arm_smmu_asid_lock);
 	arm_smmu_clear_cd(master, pasid);
+	if (master->ats_enabled)
+		arm_smmu_atc_inv_master(master, pasid);
+	arm_smmu_remove_master_domain(master, &smmu_domain->domain, pasid);
+	mutex_unlock(&arm_smmu_asid_lock);
 }
 
 static int arm_smmu_attach_dev_ste(struct iommu_domain *domain,
-- 
2.43.2


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Re: [PATCH v7 09/14] iommu/arm-smmu-v3: Keep track of arm_smmu_master_domain for SVA

[Nicolin Chen]

On Wed, May 08, 2024 at 03:57:17PM -0300, Jason Gunthorpe wrote:
> Fill in the smmu_domain->devices list in the new struct arm_smmu_domain
> that SVA allocates. Keep track of every SSID and master that is using the
> domain reusing the logic for the RID attach.
> 
> This is the first step to making the SVA invalidation follow the same
> design as S1/S2 invalidation. At present nothing will read this list.
> 
> Tested-by: Nicolin Chen <nicolinc@nvidia.com>
> Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>

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[PATCH v7 10/14] iommu/arm-smmu-v3: Put the SVA mmu notifier in the smmu_domain

[Jason Gunthorpe]

This removes all the notifier de-duplication logic in the driver and
relies on the core code to de-duplicate and allocate only one SVA domain
per mm per smmu instance. This naturally gives a 1:1 relationship between
SVA domain and mmu notifier.

It is a significant simplication of the flow, as we end up with a single
struct arm_smmu_domain for each MM and the invalidation can then be
shifted to properly use the masters list like S1/S2 do.

Remove all of the previous mmu_notifier, bond, shared cd, and cd refcount
logic entirely.

The logic here is tightly wound together with the unusued BTM
support. Since the BTM logic requires holding all the iommu_domains in a
global ASID xarray it conflicts with the design to have a single SVA
domain per PASID, as multiple SMMU instances will need to have different
domains.

Following patches resolve this by making the ASID xarray per-instance
instead of global. However, converting the BTM code over to this
methodology requires many changes.

Thus, since ARM_SMMU_FEAT_BTM is never enabled, remove the parts of the
BTM support for ASID sharing that interact with SVA as well.

A followup series is already working on fully enabling the BTM support,
that requires iommufd's VIOMMU feature to bring in the KVM's VMID as
well. It will come with an already written patch to bring back the ASID
sharing using a per-instance ASID xarray.

https://lore.kernel.org/linux-iommu/20240208151837.35068-1-shameerali.kolothum.thodi@huawei.com/
https://lore.kernel.org/linux-iommu/26-v6-228e7adf25eb+4155-smmuv3_newapi_p2_jgg@nvidia.com/

Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c   | 398 ++++--------------
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c   |  69 +--
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h   |  13 +-
 3 files changed, 89 insertions(+), 391 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
index 39ba6766513457..56871c67ba369a 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c
@@ -13,29 +13,9 @@
 #include "arm-smmu-v3.h"
 #include "../../io-pgtable-arm.h"
 
-struct arm_smmu_mmu_notifier {
-	struct mmu_notifier		mn;
-	struct arm_smmu_ctx_desc	*cd;
-	bool				cleared;
-	refcount_t			refs;
-	struct list_head		list;
-	struct arm_smmu_domain		*domain;
-};
-
-#define mn_to_smmu(mn) container_of(mn, struct arm_smmu_mmu_notifier, mn)
-
-struct arm_smmu_bond {
-	struct mm_struct		*mm;
-	struct arm_smmu_mmu_notifier	*smmu_mn;
-	struct list_head		list;
-};
-
-#define sva_to_bond(handle) \
-	container_of(handle, struct arm_smmu_bond, sva)
-
 static DEFINE_MUTEX(sva_lock);
 
-static void
+static void __maybe_unused
 arm_smmu_update_s1_domain_cd_entry(struct arm_smmu_domain *smmu_domain)
 {
 	struct arm_smmu_master_domain *master_domain;
@@ -58,58 +38,6 @@ arm_smmu_update_s1_domain_cd_entry(struct arm_smmu_domain *smmu_domain)
 	spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
 }
 
-/*
- * Check if the CPU ASID is available on the SMMU side. If a private context
- * descriptor is using it, try to replace it.
- */
-static struct arm_smmu_ctx_desc *
-arm_smmu_share_asid(struct mm_struct *mm, u16 asid)
-{
-	int ret;
-	u32 new_asid;
-	struct arm_smmu_ctx_desc *cd;
-	struct arm_smmu_device *smmu;
-	struct arm_smmu_domain *smmu_domain;
-
-	cd = xa_load(&arm_smmu_asid_xa, asid);
-	if (!cd)
-		return NULL;
-
-	if (cd->mm) {
-		if (WARN_ON(cd->mm != mm))
-			return ERR_PTR(-EINVAL);
-		/* All devices bound to this mm use the same cd struct. */
-		refcount_inc(&cd->refs);
-		return cd;
-	}
-
-	smmu_domain = container_of(cd, struct arm_smmu_domain, cd);
-	smmu = smmu_domain->smmu;
-
-	ret = xa_alloc(&arm_smmu_asid_xa, &new_asid, cd,
-		       XA_LIMIT(1, (1 << smmu->asid_bits) - 1), GFP_KERNEL);
-	if (ret)
-		return ERR_PTR(-ENOSPC);
-	/*
-	 * Race with unmap: TLB invalidations will start targeting the new ASID,
-	 * which isn't assigned yet. We'll do an invalidate-all on the old ASID
-	 * later, so it doesn't matter.
-	 */
-	cd->asid = new_asid;
-	/*
-	 * Update ASID and invalidate CD in all associated masters. There will
-	 * be some overlap between use of both ASIDs, until we invalidate the
-	 * TLB.
-	 */
-	arm_smmu_update_s1_domain_cd_entry(smmu_domain);
-
-	/* Invalidate TLB entries previously associated with that context */
-	arm_smmu_tlb_inv_asid(smmu, asid);
-
-	xa_erase(&arm_smmu_asid_xa, asid);
-	return NULL;
-}
-
 static u64 page_size_to_cd(void)
 {
 	static_assert(PAGE_SIZE == SZ_4K || PAGE_SIZE == SZ_16K ||
@@ -187,69 +115,6 @@ void arm_smmu_make_sva_cd(struct arm_smmu_cd *target,
 }
 EXPORT_SYMBOL_IF_KUNIT(arm_smmu_make_sva_cd);
 
-static struct arm_smmu_ctx_desc *arm_smmu_alloc_shared_cd(struct mm_struct *mm)
-{
-	u16 asid;
-	int err = 0;
-	struct arm_smmu_ctx_desc *cd;
-	struct arm_smmu_ctx_desc *ret = NULL;
-
-	/* Don't free the mm until we release the ASID */
-	mmgrab(mm);
-
-	asid = arm64_mm_context_get(mm);
-	if (!asid) {
-		err = -ESRCH;
-		goto out_drop_mm;
-	}
-
-	cd = kzalloc(sizeof(*cd), GFP_KERNEL);
-	if (!cd) {
-		err = -ENOMEM;
-		goto out_put_context;
-	}
-
-	refcount_set(&cd->refs, 1);
-
-	mutex_lock(&arm_smmu_asid_lock);
-	ret = arm_smmu_share_asid(mm, asid);
-	if (ret) {
-		mutex_unlock(&arm_smmu_asid_lock);
-		goto out_free_cd;
-	}
-
-	err = xa_insert(&arm_smmu_asid_xa, asid, cd, GFP_KERNEL);
-	mutex_unlock(&arm_smmu_asid_lock);
-
-	if (err)
-		goto out_free_asid;
-
-	cd->asid = asid;
-	cd->mm = mm;
-
-	return cd;
-
-out_free_asid:
-	arm_smmu_free_asid(cd);
-out_free_cd:
-	kfree(cd);
-out_put_context:
-	arm64_mm_context_put(mm);
-out_drop_mm:
-	mmdrop(mm);
-	return err < 0 ? ERR_PTR(err) : ret;
-}
-
-static void arm_smmu_free_shared_cd(struct arm_smmu_ctx_desc *cd)
-{
-	if (arm_smmu_free_asid(cd)) {
-		/* Unpin ASID */
-		arm64_mm_context_put(cd->mm);
-		mmdrop(cd->mm);
-		kfree(cd);
-	}
-}
-
 /*
  * Cloned from the MAX_TLBI_OPS in arch/arm64/include/asm/tlbflush.h, this
  * is used as a threshold to replace per-page TLBI commands to issue in the
@@ -264,8 +129,8 @@ static void arm_smmu_mm_arch_invalidate_secondary_tlbs(struct mmu_notifier *mn,
 						unsigned long start,
 						unsigned long end)
 {
-	struct arm_smmu_mmu_notifier *smmu_mn = mn_to_smmu(mn);
-	struct arm_smmu_domain *smmu_domain = smmu_mn->domain;
+	struct arm_smmu_domain *smmu_domain =
+		container_of(mn, struct arm_smmu_domain, mmu_notifier);
 	size_t size;
 
 	/*
@@ -282,34 +147,22 @@ static void arm_smmu_mm_arch_invalidate_secondary_tlbs(struct mmu_notifier *mn,
 			size = 0;
 	}
 
-	if (!(smmu_domain->smmu->features & ARM_SMMU_FEAT_BTM)) {
-		if (!size)
-			arm_smmu_tlb_inv_asid(smmu_domain->smmu,
-					      smmu_mn->cd->asid);
-		else
-			arm_smmu_tlb_inv_range_asid(start, size,
-						    smmu_mn->cd->asid,
-						    PAGE_SIZE, false,
-						    smmu_domain);
-	}
+	if (!size)
+		arm_smmu_tlb_inv_asid(smmu_domain->smmu, smmu_domain->cd.asid);
+	else
+		arm_smmu_tlb_inv_range_asid(start, size, smmu_domain->cd.asid,
+					    PAGE_SIZE, false, smmu_domain);
 
-	arm_smmu_atc_inv_domain_sva(smmu_domain, mm_get_enqcmd_pasid(mm), start,
-				    size);
+	arm_smmu_atc_inv_domain(smmu_domain, start, size);
 }
 
 static void arm_smmu_mm_release(struct mmu_notifier *mn, struct mm_struct *mm)
 {
-	struct arm_smmu_mmu_notifier *smmu_mn = mn_to_smmu(mn);
-	struct arm_smmu_domain *smmu_domain = smmu_mn->domain;
+	struct arm_smmu_domain *smmu_domain =
+		container_of(mn, struct arm_smmu_domain, mmu_notifier);
 	struct arm_smmu_master_domain *master_domain;
 	unsigned long flags;
 
-	mutex_lock(&sva_lock);
-	if (smmu_mn->cleared) {
-		mutex_unlock(&sva_lock);
-		return;
-	}
-
 	/*
 	 * DMA may still be running. Keep the cd valid to avoid C_BAD_CD events,
 	 * but disable translation.
@@ -321,25 +174,26 @@ static void arm_smmu_mm_release(struct mmu_notifier *mn, struct mm_struct *mm)
 		struct arm_smmu_cd target;
 		struct arm_smmu_cd *cdptr;
 
-		cdptr = arm_smmu_get_cd_ptr(master, mm_get_enqcmd_pasid(mm));
+		cdptr = arm_smmu_get_cd_ptr(master, master_domain->ssid);
 		if (WARN_ON(!cdptr))
 			continue;
-		arm_smmu_make_sva_cd(&target, master, NULL, smmu_mn->cd->asid);
-		arm_smmu_write_cd_entry(master, mm_get_enqcmd_pasid(mm), cdptr,
+		arm_smmu_make_sva_cd(&target, master, NULL,
+				     smmu_domain->cd.asid);
+		arm_smmu_write_cd_entry(master, master_domain->ssid, cdptr,
 					&target);
 	}
 	spin_unlock_irqrestore(&smmu_domain->devices_lock, flags);
 
-	arm_smmu_tlb_inv_asid(smmu_domain->smmu, smmu_mn->cd->asid);
-	arm_smmu_atc_inv_domain_sva(smmu_domain, mm_get_enqcmd_pasid(mm), 0, 0);
-
-	smmu_mn->cleared = true;
-	mutex_unlock(&sva_lock);
+	arm_smmu_tlb_inv_asid(smmu_domain->smmu, smmu_domain->cd.asid);
+	arm_smmu_atc_inv_domain(smmu_domain, 0, 0);
 }
 
 static void arm_smmu_mmu_notifier_free(struct mmu_notifier *mn)
 {
-	kfree(mn_to_smmu(mn));
+	struct arm_smmu_domain *smmu_domain =
+		container_of(mn, struct arm_smmu_domain, mmu_notifier);
+
+	kfree(smmu_domain);
 }
 
 static const struct mmu_notifier_ops arm_smmu_mmu_notifier_ops = {
@@ -348,115 +202,6 @@ static const struct mmu_notifier_ops arm_smmu_mmu_notifier_ops = {
 	.free_notifier			= arm_smmu_mmu_notifier_free,
 };
 
-/* Allocate or get existing MMU notifier for this {domain, mm} pair */
-static struct arm_smmu_mmu_notifier *
-arm_smmu_mmu_notifier_get(struct arm_smmu_domain *smmu_domain,
-			  struct mm_struct *mm)
-{
-	int ret;
-	struct arm_smmu_ctx_desc *cd;
-	struct arm_smmu_mmu_notifier *smmu_mn;
-
-	list_for_each_entry(smmu_mn, &smmu_domain->mmu_notifiers, list) {
-		if (smmu_mn->mn.mm == mm) {
-			refcount_inc(&smmu_mn->refs);
-			return smmu_mn;
-		}
-	}
-
-	cd = arm_smmu_alloc_shared_cd(mm);
-	if (IS_ERR(cd))
-		return ERR_CAST(cd);
-
-	smmu_mn = kzalloc(sizeof(*smmu_mn), GFP_KERNEL);
-	if (!smmu_mn) {
-		ret = -ENOMEM;
-		goto err_free_cd;
-	}
-
-	refcount_set(&smmu_mn->refs, 1);
-	smmu_mn->cd = cd;
-	smmu_mn->domain = smmu_domain;
-	smmu_mn->mn.ops = &arm_smmu_mmu_notifier_ops;
-
-	ret = mmu_notifier_register(&smmu_mn->mn, mm);
-	if (ret) {
-		kfree(smmu_mn);
-		goto err_free_cd;
-	}
-
-	list_add(&smmu_mn->list, &smmu_domain->mmu_notifiers);
-	return smmu_mn;
-
-err_free_cd:
-	arm_smmu_free_shared_cd(cd);
-	return ERR_PTR(ret);
-}
-
-static void arm_smmu_mmu_notifier_put(struct arm_smmu_mmu_notifier *smmu_mn)
-{
-	struct mm_struct *mm = smmu_mn->mn.mm;
-	struct arm_smmu_ctx_desc *cd = smmu_mn->cd;
-	struct arm_smmu_domain *smmu_domain = smmu_mn->domain;
-
-	if (!refcount_dec_and_test(&smmu_mn->refs))
-		return;
-
-	list_del(&smmu_mn->list);
-
-	/*
-	 * If we went through clear(), we've already invalidated, and no
-	 * new TLB entry can have been formed.
-	 */
-	if (!smmu_mn->cleared) {
-		arm_smmu_tlb_inv_asid(smmu_domain->smmu, cd->asid);
-		arm_smmu_atc_inv_domain_sva(smmu_domain,
-					    mm_get_enqcmd_pasid(mm), 0, 0);
-	}
-
-	/* Frees smmu_mn */
-	mmu_notifier_put(&smmu_mn->mn);
-	arm_smmu_free_shared_cd(cd);
-}
-
-static struct arm_smmu_bond *__arm_smmu_sva_bind(struct device *dev,
-						 struct mm_struct *mm)
-{
-	int ret;
-	struct arm_smmu_bond *bond;
-	struct arm_smmu_master *master = dev_iommu_priv_get(dev);
-	struct iommu_domain *domain = iommu_get_domain_for_dev(dev);
-	struct arm_smmu_domain *smmu_domain;
-
-	if (!(domain->type & __IOMMU_DOMAIN_PAGING))
-		return ERR_PTR(-ENODEV);
-	smmu_domain = to_smmu_domain(domain);
-	if (smmu_domain->stage != ARM_SMMU_DOMAIN_S1)
-		return ERR_PTR(-ENODEV);
-
-	if (!master || !master->sva_enabled)
-		return ERR_PTR(-ENODEV);
-
-	bond = kzalloc(sizeof(*bond), GFP_KERNEL);
-	if (!bond)
-		return ERR_PTR(-ENOMEM);
-
-	bond->mm = mm;
-
-	bond->smmu_mn = arm_smmu_mmu_notifier_get(smmu_domain, mm);
-	if (IS_ERR(bond->smmu_mn)) {
-		ret = PTR_ERR(bond->smmu_mn);
-		goto err_free_bond;
-	}
-
-	list_add(&bond->list, &master->bonds);
-	return bond;
-
-err_free_bond:
-	kfree(bond);
-	return ERR_PTR(ret);
-}
-
 bool arm_smmu_sva_supported(struct arm_smmu_device *smmu)
 {
 	unsigned long reg, fld;
@@ -573,11 +318,6 @@ int arm_smmu_master_enable_sva(struct arm_smmu_master *master)
 int arm_smmu_master_disable_sva(struct arm_smmu_master *master)
 {
 	mutex_lock(&sva_lock);
-	if (!list_empty(&master->bonds)) {
-		dev_err(master->dev, "cannot disable SVA, device is bound\n");
-		mutex_unlock(&sva_lock);
-		return -EBUSY;
-	}
 	arm_smmu_master_sva_disable_iopf(master);
 	master->sva_enabled = false;
 	mutex_unlock(&sva_lock);
@@ -594,66 +334,51 @@ void arm_smmu_sva_notifier_synchronize(void)
 	mmu_notifier_synchronize();
 }
 
-void arm_smmu_sva_remove_dev_pasid(struct iommu_domain *domain,
-				   struct device *dev, ioasid_t id)
-{
-	struct mm_struct *mm = domain->mm;
-	struct arm_smmu_bond *bond = NULL, *t;
-	struct arm_smmu_master *master = dev_iommu_priv_get(dev);
-
-	arm_smmu_remove_pasid(master, to_smmu_domain(domain), id);
-
-	mutex_lock(&sva_lock);
-	list_for_each_entry(t, &master->bonds, list) {
-		if (t->mm == mm) {
-			bond = t;
-			break;
-		}
-	}
-
-	if (!WARN_ON(!bond)) {
-		list_del(&bond->list);
-		arm_smmu_mmu_notifier_put(bond->smmu_mn);
-		kfree(bond);
-	}
-	mutex_unlock(&sva_lock);
-}
-
 static int arm_smmu_sva_set_dev_pasid(struct iommu_domain *domain,
 				      struct device *dev, ioasid_t id)
 {
+	struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
 	struct arm_smmu_master *master = dev_iommu_priv_get(dev);
-	struct mm_struct *mm = domain->mm;
-	struct arm_smmu_bond *bond;
 	struct arm_smmu_cd target;
 	int ret;
 
-	if (mm_get_enqcmd_pasid(mm) != id || !master->cd_table.in_ste)
+	/* Prevent arm_smmu_mm_release from being called while we are attaching */
+	if (!mmget_not_zero(domain->mm))
 		return -EINVAL;
 
-	mutex_lock(&sva_lock);
-	bond = __arm_smmu_sva_bind(dev, mm);
-	if (IS_ERR(bond)) {
-		mutex_unlock(&sva_lock);
-		return PTR_ERR(bond);
-	}
+	/*
+	 * This does not need the arm_smmu_asid_lock because SVA domains never
+	 * get reassigned
+	 */
+	arm_smmu_make_sva_cd(&target, master, domain->mm, smmu_domain->cd.asid);
+	ret = arm_smmu_set_pasid(master, smmu_domain, id, &target);
 
-	arm_smmu_make_sva_cd(&target, master, mm, bond->smmu_mn->cd->asid);
-	ret = arm_smmu_set_pasid(master, to_smmu_domain(domain), id, &target);
-	if (ret) {
-		list_del(&bond->list);
-		arm_smmu_mmu_notifier_put(bond->smmu_mn);
-		kfree(bond);
-		mutex_unlock(&sva_lock);
-		return ret;
-	}
-	mutex_unlock(&sva_lock);
-	return 0;
+	mmput(domain->mm);
+	return ret;
 }
 
 static void arm_smmu_sva_domain_free(struct iommu_domain *domain)
 {
-	kfree(to_smmu_domain(domain));
+	struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+
+	/*
+	 * Ensure the ASID is empty in the iommu cache before allowing reuse.
+	 */
+	arm_smmu_tlb_inv_asid(smmu_domain->smmu, smmu_domain->cd.asid);
+
+	/*
+	 * Notice that the arm_smmu_mm_arch_invalidate_secondary_tlbs op can
+	 * still be called/running at this point. We allow the ASID to be
+	 * reused, and if there is a race then it just suffers harmless
+	 * unnecessary invalidation.
+	 */
+	xa_erase(&arm_smmu_asid_xa, smmu_domain->cd.asid);
+
+	/*
+	 * Actual free is defered to the SRCU callback
+	 * arm_smmu_mmu_notifier_free()
+	 */
+	mmu_notifier_put(&smmu_domain->mmu_notifier);
 }
 
 static const struct iommu_domain_ops arm_smmu_sva_domain_ops = {
@@ -667,6 +392,8 @@ struct iommu_domain *arm_smmu_sva_domain_alloc(struct device *dev,
 	struct arm_smmu_master *master = dev_iommu_priv_get(dev);
 	struct arm_smmu_device *smmu = master->smmu;
 	struct arm_smmu_domain *smmu_domain;
+	u32 asid;
+	int ret;
 
 	smmu_domain = arm_smmu_domain_alloc();
 	if (IS_ERR(smmu_domain))
@@ -675,5 +402,22 @@ struct iommu_domain *arm_smmu_sva_domain_alloc(struct device *dev,
 	smmu_domain->domain.ops = &arm_smmu_sva_domain_ops;
 	smmu_domain->smmu = smmu;
 
+	ret = xa_alloc(&arm_smmu_asid_xa, &asid, smmu_domain,
+		       XA_LIMIT(1, (1 << smmu->asid_bits) - 1), GFP_KERNEL);
+	if (ret)
+		goto err_free;
+
+	smmu_domain->cd.asid = asid;
+	smmu_domain->mmu_notifier.ops = &arm_smmu_mmu_notifier_ops;
+	ret = mmu_notifier_register(&smmu_domain->mmu_notifier, mm);
+	if (ret)
+		goto err_asid;
+
 	return &smmu_domain->domain;
+
+err_asid:
+	xa_erase(&arm_smmu_asid_xa, smmu_domain->cd.asid);
+err_free:
+	kfree(smmu_domain);
+	return ERR_PTR(ret);
 }
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 020e4efdf8fc06..15378c131a5bc7 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -1439,22 +1439,6 @@ static void arm_smmu_free_cd_tables(struct arm_smmu_master *master)
 	cd_table->cdtab = NULL;
 }
 
-bool arm_smmu_free_asid(struct arm_smmu_ctx_desc *cd)
-{
-	bool free;
-	struct arm_smmu_ctx_desc *old_cd;
-
-	if (!cd->asid)
-		return false;
-
-	free = refcount_dec_and_test(&cd->refs);
-	if (free) {
-		old_cd = xa_erase(&arm_smmu_asid_xa, cd->asid);
-		WARN_ON(old_cd != cd);
-	}
-	return free;
-}
-
 /* Stream table manipulation functions */
 static void
 arm_smmu_write_strtab_l1_desc(__le64 *dst, struct arm_smmu_strtab_l1_desc *desc)
@@ -2023,8 +2007,8 @@ static int arm_smmu_atc_inv_master(struct arm_smmu_master *master,
 	return arm_smmu_cmdq_batch_submit(master->smmu, &cmds);
 }
 
-static int __arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain,
-				     ioasid_t ssid, unsigned long iova, size_t size)
+int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain,
+			    unsigned long iova, size_t size)
 {
 	struct arm_smmu_master_domain *master_domain;
 	int i;
@@ -2062,15 +2046,7 @@ static int __arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain,
 		if (!master->ats_enabled)
 			continue;
 
-		/*
-		 * Non-zero ssid means SVA is co-opting the S1 domain to issue
-		 * invalidations for SVA PASIDs.
-		 */
-		if (ssid != IOMMU_NO_PASID)
-			arm_smmu_atc_inv_to_cmd(ssid, iova, size, &cmd);
-		else
-			arm_smmu_atc_inv_to_cmd(master_domain->ssid, iova, size,
-						&cmd);
+		arm_smmu_atc_inv_to_cmd(master_domain->ssid, iova, size, &cmd);
 
 		for (i = 0; i < master->num_streams; i++) {
 			cmd.atc.sid = master->streams[i].id;
@@ -2082,19 +2058,6 @@ static int __arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain,
 	return arm_smmu_cmdq_batch_submit(smmu_domain->smmu, &cmds);
 }
 
-static int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain,
-				   unsigned long iova, size_t size)
-{
-	return __arm_smmu_atc_inv_domain(smmu_domain, IOMMU_NO_PASID, iova,
-					 size);
-}
-
-int arm_smmu_atc_inv_domain_sva(struct arm_smmu_domain *smmu_domain,
-				ioasid_t ssid, unsigned long iova, size_t size)
-{
-	return __arm_smmu_atc_inv_domain(smmu_domain, ssid, iova, size);
-}
-
 /* IO_PGTABLE API */
 static void arm_smmu_tlb_inv_context(void *cookie)
 {
@@ -2283,7 +2246,6 @@ struct arm_smmu_domain *arm_smmu_domain_alloc(void)
 	mutex_init(&smmu_domain->init_mutex);
 	INIT_LIST_HEAD(&smmu_domain->devices);
 	spin_lock_init(&smmu_domain->devices_lock);
-	INIT_LIST_HEAD(&smmu_domain->mmu_notifiers);
 
 	return smmu_domain;
 }
@@ -2325,7 +2287,7 @@ static void arm_smmu_domain_free_paging(struct iommu_domain *domain)
 	if (smmu_domain->stage == ARM_SMMU_DOMAIN_S1) {
 		/* Prevent SVA from touching the CD while we're freeing it */
 		mutex_lock(&arm_smmu_asid_lock);
-		arm_smmu_free_asid(&smmu_domain->cd);
+		xa_erase(&arm_smmu_asid_xa, smmu_domain->cd.asid);
 		mutex_unlock(&arm_smmu_asid_lock);
 	} else {
 		struct arm_smmu_s2_cfg *cfg = &smmu_domain->s2_cfg;
@@ -2343,11 +2305,9 @@ static int arm_smmu_domain_finalise_s1(struct arm_smmu_device *smmu,
 	u32 asid;
 	struct arm_smmu_ctx_desc *cd = &smmu_domain->cd;
 
-	refcount_set(&cd->refs, 1);
-
 	/* Prevent SVA from modifying the ASID until it is written to the CD */
 	mutex_lock(&arm_smmu_asid_lock);
-	ret = xa_alloc(&arm_smmu_asid_xa, &asid, cd,
+	ret = xa_alloc(&arm_smmu_asid_xa, &asid, smmu_domain,
 		       XA_LIMIT(1, (1 << smmu->asid_bits) - 1), GFP_KERNEL);
 	cd->asid	= (u16)asid;
 	mutex_unlock(&arm_smmu_asid_lock);
@@ -2806,6 +2766,9 @@ int arm_smmu_set_pasid(struct arm_smmu_master *master,
 
 	/* The core code validates pasid */
 
+	if (smmu_domain->smmu != master->smmu)
+		return -EINVAL;
+
 	if (!master->cd_table.in_ste)
 		return -ENODEV;
 
@@ -2827,9 +2790,14 @@ int arm_smmu_set_pasid(struct arm_smmu_master *master,
 	return ret;
 }
 
-void arm_smmu_remove_pasid(struct arm_smmu_master *master,
-			   struct arm_smmu_domain *smmu_domain, ioasid_t pasid)
+static void arm_smmu_remove_dev_pasid(struct device *dev, ioasid_t pasid,
+				      struct iommu_domain *domain)
 {
+	struct arm_smmu_master *master = dev_iommu_priv_get(dev);
+	struct arm_smmu_domain *smmu_domain;
+
+	smmu_domain = to_smmu_domain(domain);
+
 	mutex_lock(&arm_smmu_asid_lock);
 	arm_smmu_clear_cd(master, pasid);
 	if (master->ats_enabled)
@@ -3107,7 +3075,6 @@ static struct iommu_device *arm_smmu_probe_device(struct device *dev)
 
 	master->dev = dev;
 	master->smmu = smmu;
-	INIT_LIST_HEAD(&master->bonds);
 	dev_iommu_priv_set(dev, master);
 
 	ret = arm_smmu_insert_master(smmu, master);
@@ -3289,12 +3256,6 @@ static int arm_smmu_def_domain_type(struct device *dev)
 	return 0;
 }
 
-static void arm_smmu_remove_dev_pasid(struct device *dev, ioasid_t pasid,
-				      struct iommu_domain *domain)
-{
-	arm_smmu_sva_remove_dev_pasid(domain, dev, pasid);
-}
-
 static struct iommu_ops arm_smmu_ops = {
 	.identity_domain	= &arm_smmu_identity_domain,
 	.blocked_domain		= &arm_smmu_blocked_domain,
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
index a036610e50da14..100e6721e16131 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -587,9 +587,6 @@ struct arm_smmu_strtab_l1_desc {
 
 struct arm_smmu_ctx_desc {
 	u16				asid;
-
-	refcount_t			refs;
-	struct mm_struct		*mm;
 };
 
 struct arm_smmu_l1_ctx_desc {
@@ -712,7 +709,6 @@ struct arm_smmu_master {
 	bool				stall_enabled;
 	bool				sva_enabled;
 	bool				iopf_enabled;
-	struct list_head		bonds;
 	unsigned int			ssid_bits;
 };
 
@@ -741,7 +737,7 @@ struct arm_smmu_domain {
 	struct list_head		devices;
 	spinlock_t			devices_lock;
 
-	struct list_head		mmu_notifiers;
+	struct mmu_notifier		mmu_notifier;
 };
 
 /* The following are exposed for testing purposes. */
@@ -812,9 +808,8 @@ void arm_smmu_tlb_inv_asid(struct arm_smmu_device *smmu, u16 asid);
 void arm_smmu_tlb_inv_range_asid(unsigned long iova, size_t size, int asid,
 				 size_t granule, bool leaf,
 				 struct arm_smmu_domain *smmu_domain);
-bool arm_smmu_free_asid(struct arm_smmu_ctx_desc *cd);
-int arm_smmu_atc_inv_domain_sva(struct arm_smmu_domain *smmu_domain,
-				ioasid_t ssid, unsigned long iova, size_t size);
+int arm_smmu_atc_inv_domain(struct arm_smmu_domain *smmu_domain,
+			    unsigned long iova, size_t size);
 
 #ifdef CONFIG_ARM_SMMU_V3_SVA
 bool arm_smmu_sva_supported(struct arm_smmu_device *smmu);
@@ -826,8 +821,6 @@ bool arm_smmu_master_iopf_supported(struct arm_smmu_master *master);
 void arm_smmu_sva_notifier_synchronize(void);
 struct iommu_domain *arm_smmu_sva_domain_alloc(struct device *dev,
 					       struct mm_struct *mm);
-void arm_smmu_sva_remove_dev_pasid(struct iommu_domain *domain,
-				   struct device *dev, ioasid_t id);
 #else /* CONFIG_ARM_SMMU_V3_SVA */
 static inline bool arm_smmu_sva_supported(struct arm_smmu_device *smmu)
 {
-- 
2.43.2


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Re: [PATCH v7 10/14] iommu/arm-smmu-v3: Put the SVA mmu notifier in the smmu_domain

[Nicolin Chen]

On Wed, May 08, 2024 at 03:57:18PM -0300, Jason Gunthorpe wrote:
> This removes all the notifier de-duplication logic in the driver and
> relies on the core code to de-duplicate and allocate only one SVA domain
> per mm per smmu instance. This naturally gives a 1:1 relationship between
> SVA domain and mmu notifier.
> 
> It is a significant simplication of the flow, as we end up with a single
> struct arm_smmu_domain for each MM and the invalidation can then be
> shifted to properly use the masters list like S1/S2 do.
> 
> Remove all of the previous mmu_notifier, bond, shared cd, and cd refcount
> logic entirely.
> 
> The logic here is tightly wound together with the unusued BTM
> support. Since the BTM logic requires holding all the iommu_domains in a
> global ASID xarray it conflicts with the design to have a single SVA
> domain per PASID, as multiple SMMU instances will need to have different
> domains.
> 
> Following patches resolve this by making the ASID xarray per-instance
> instead of global. However, converting the BTM code over to this
> methodology requires many changes.
> 
> Thus, since ARM_SMMU_FEAT_BTM is never enabled, remove the parts of the
> BTM support for ASID sharing that interact with SVA as well.
> 
> A followup series is already working on fully enabling the BTM support,
> that requires iommufd's VIOMMU feature to bring in the KVM's VMID as
> well. It will come with an already written patch to bring back the ASID
> sharing using a per-instance ASID xarray.
> 
> https://lore.kernel.org/linux-iommu/20240208151837.35068-1-shameerali.kolothum.thodi@huawei.com/
> https://lore.kernel.org/linux-iommu/26-v6-228e7adf25eb+4155-smmuv3_newapi_p2_jgg@nvidia.com/
> 
> Tested-by: Nicolin Chen <nicolinc@nvidia.com>
> Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>

>  static void arm_smmu_mmu_notifier_free(struct mmu_notifier *mn)
>  {
> -	kfree(mn_to_smmu(mn));
> +	struct arm_smmu_domain *smmu_domain =
> +		container_of(mn, struct arm_smmu_domain, mmu_notifier);
> +
> +	kfree(smmu_domain);

Would it be cleaner to refactor mn_to_smmu to mn_to_smmu_domain?

Otherwise, would it feel simpler by just
	kfree(container_of(mn, struct arm_smmu_domain, mmu_notifier));

Thanks
Nicolin

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Re: [PATCH v7 10/14] iommu/arm-smmu-v3: Put the SVA mmu notifier in the smmu_domain

[Jason Gunthorpe]

On Mon, May 13, 2024 at 02:23:18PM -0700, Nicolin Chen wrote:
> >  static void arm_smmu_mmu_notifier_free(struct mmu_notifier *mn)
> >  {
> > -	kfree(mn_to_smmu(mn));
> > +	struct arm_smmu_domain *smmu_domain =
> > +		container_of(mn, struct arm_smmu_domain, mmu_notifier);
> > +
> > +	kfree(smmu_domain);
> 
> Would it be cleaner to refactor mn_to_smmu to mn_to_smmu_domain?

I usually like a few more usages before making macros..
 
> Otherwise, would it feel simpler by just
> 	kfree(container_of(mn, struct arm_smmu_domain, mmu_notifier));

Sure

Jason

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Re: [PATCH v7 10/14] iommu/arm-smmu-v3: Put the SVA mmu notifier in the smmu_domain

[Nicolin Chen]

On Fri, May 17, 2024 at 04:48:14PM -0300, Jason Gunthorpe wrote:
> On Mon, May 13, 2024 at 02:23:18PM -0700, Nicolin Chen wrote:
> > >  static void arm_smmu_mmu_notifier_free(struct mmu_notifier *mn)
> > >  {
> > > -	kfree(mn_to_smmu(mn));
> > > +	struct arm_smmu_domain *smmu_domain =
> > > +		container_of(mn, struct arm_smmu_domain, mmu_notifier);
> > > +
> > > +	kfree(smmu_domain);
> > 
> > Would it be cleaner to refactor mn_to_smmu to mn_to_smmu_domain?
> 
> I usually like a few more usages before making macros..

Hmm, asking because I saw three of them in the end:
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c:145:            container_of(mn, struct arm_smmu_domain, mmu_notifier);
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c:166:            container_of(mn, struct arm_smmu_domain, mmu_notifier);
drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c:201:            container_of(mn, struct arm_smmu_domain, mmu_notifier);

How many more usages typically could be a good threshold?

It's a nit though. So, in either way it's fine.

Thanks
Nicolin

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[PATCH v7 11/14] iommu/arm-smmu-v3: Allow IDENTITY/BLOCKED to be set while PASID is used

[Jason Gunthorpe]

The HW supports this, use the S1DSS bits to configure the behavior
of SSID=0 which is the RID's translation.

If SSID's are currently being used in the CD table then just update the
S1DSS bits in the STE, remove the master_domain and leave ATS alone.

For iommufd the driver design has a small problem that all the unused CD
table entries are set with V=0 which will generate an event if VFIO
userspace tries to use the CD entry. This patch extends this problem to
include the RID as well if PASID is being used.

For BLOCKED with used PASIDs the
F_STREAM_DISABLED (STRTAB_STE_1_S1DSS_TERMINATE) event is generated on
untagged traffic and a substream CD table entry with V=0 (removed pasid)
will generate C_BAD_CD. Arguably there is no advantage to using S1DSS over
the CD entry 0 with V=0.

As we don't yet support PASID in iommufd this is a problem to resolve
later, possibly by using EPD0 for unused CD table entries instead of V=0,
and not using S1DSS for BLOCKED.

Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 .../iommu/arm/arm-smmu-v3/arm-smmu-v3-test.c  |  2 +-
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c   | 67 ++++++++++++++-----
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h   |  4 +-
 3 files changed, 52 insertions(+), 21 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-test.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-test.c
index a460b71f585789..d7e022bb9df530 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-test.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-test.c
@@ -164,7 +164,7 @@ static void arm_smmu_test_make_cdtable_ste(struct arm_smmu_ste *ste,
 		.smmu = &smmu,
 	};
 
-	arm_smmu_make_cdtable_ste(ste, &master, true);
+	arm_smmu_make_cdtable_ste(ste, &master, true, STRTAB_STE_1_S1DSS_SSID0);
 }
 
 static void arm_smmu_v3_write_ste_test_bypass_to_abort(struct kunit *test)
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 15378c131a5bc7..41d7a0664a445d 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -991,6 +991,14 @@ void arm_smmu_get_ste_used(const __le64 *ent, __le64 *used_bits)
 				    STRTAB_STE_1_S1STALLD | STRTAB_STE_1_STRW |
 				    STRTAB_STE_1_EATS);
 		used_bits[2] |= cpu_to_le64(STRTAB_STE_2_S2VMID);
+
+		/*
+		 * See 13.5 Summary of attribute/permission configuration fields
+		 * for the SHCFG behavior.
+		 */
+		if (FIELD_GET(STRTAB_STE_1_S1DSS, le64_to_cpu(ent[1])) ==
+		    STRTAB_STE_1_S1DSS_BYPASS)
+			used_bits[1] |= cpu_to_le64(STRTAB_STE_1_SHCFG);
 	}
 
 	/* S2 translates */
@@ -1531,7 +1539,8 @@ EXPORT_SYMBOL_IF_KUNIT(arm_smmu_make_bypass_ste);
 
 VISIBLE_IF_KUNIT
 void arm_smmu_make_cdtable_ste(struct arm_smmu_ste *target,
-			       struct arm_smmu_master *master, bool ats_enabled)
+			       struct arm_smmu_master *master, bool ats_enabled,
+			       unsigned int s1dss)
 {
 	struct arm_smmu_ctx_desc_cfg *cd_table = &master->cd_table;
 	struct arm_smmu_device *smmu = master->smmu;
@@ -1545,7 +1554,7 @@ void arm_smmu_make_cdtable_ste(struct arm_smmu_ste *target,
 		FIELD_PREP(STRTAB_STE_0_S1CDMAX, cd_table->s1cdmax));
 
 	target->data[1] = cpu_to_le64(
-		FIELD_PREP(STRTAB_STE_1_S1DSS, STRTAB_STE_1_S1DSS_SSID0) |
+		FIELD_PREP(STRTAB_STE_1_S1DSS, s1dss) |
 		FIELD_PREP(STRTAB_STE_1_S1CIR, STRTAB_STE_1_S1C_CACHE_WBRA) |
 		FIELD_PREP(STRTAB_STE_1_S1COR, STRTAB_STE_1_S1C_CACHE_WBRA) |
 		FIELD_PREP(STRTAB_STE_1_S1CSH, ARM_SMMU_SH_ISH) |
@@ -1556,6 +1565,11 @@ void arm_smmu_make_cdtable_ste(struct arm_smmu_ste *target,
 		FIELD_PREP(STRTAB_STE_1_EATS,
 			   ats_enabled ? STRTAB_STE_1_EATS_TRANS : 0));
 
+	if ((smmu->features & ARM_SMMU_FEAT_ATTR_TYPES_OVR) &&
+	    s1dss == STRTAB_STE_1_S1DSS_BYPASS)
+		target->data[1] |= cpu_to_le64(FIELD_PREP(
+			STRTAB_STE_1_SHCFG, STRTAB_STE_1_SHCFG_INCOMING));
+
 	if (smmu->features & ARM_SMMU_FEAT_E2H) {
 		/*
 		 * To support BTM the streamworld needs to match the
@@ -2733,7 +2747,8 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
 		arm_smmu_make_s1_cd(&target_cd, master, smmu_domain);
 		arm_smmu_write_cd_entry(master, IOMMU_NO_PASID, cdptr,
 					&target_cd);
-		arm_smmu_make_cdtable_ste(&target, master, state.want_ats);
+		arm_smmu_make_cdtable_ste(&target, master, state.want_ats,
+					  STRTAB_STE_1_S1DSS_SSID0);
 		arm_smmu_install_ste_for_dev(master, &target);
 		break;
 	}
@@ -2806,8 +2821,10 @@ static void arm_smmu_remove_dev_pasid(struct device *dev, ioasid_t pasid,
 	mutex_unlock(&arm_smmu_asid_lock);
 }
 
-static int arm_smmu_attach_dev_ste(struct iommu_domain *domain,
-				   struct device *dev, struct arm_smmu_ste *ste)
+static void arm_smmu_attach_dev_ste(struct iommu_domain *domain,
+				    struct device *dev,
+				    struct arm_smmu_ste *ste,
+				    unsigned int s1dss)
 {
 	struct arm_smmu_master *master = dev_iommu_priv_get(dev);
 	struct attach_state state = {
@@ -2815,9 +2832,6 @@ static int arm_smmu_attach_dev_ste(struct iommu_domain *domain,
 		.ssid = IOMMU_NO_PASID,
 	};
 
-	if (arm_smmu_ssids_in_use(&master->cd_table))
-		return -EBUSY;
-
 	/*
 	 * Do not allow any ASID to be changed while are working on the STE,
 	 * otherwise we could miss invalidations.
@@ -2825,14 +2839,29 @@ static int arm_smmu_attach_dev_ste(struct iommu_domain *domain,
 	mutex_lock(&arm_smmu_asid_lock);
 
 	/*
-	 * The SMMU does not support enabling ATS with bypass/abort. When the
-	 * STE is in bypass (STE.Config[2:0] == 0b100), ATS Translation Requests
-	 * and Translated transactions are denied as though ATS is disabled for
-	 * the stream (STE.EATS == 0b00), causing F_BAD_ATS_TREQ and
-	 * F_TRANSL_FORBIDDEN events (IHI0070Ea 5.2 Stream Table Entry).
+	 * If the CD table is not in use we can use the provided STE, otherwise
+	 * we use a cdtable STE with the provided S1DSS.
 	 */
-	state.disable_ats = true;
-	arm_smmu_attach_prepare(master, domain, &state);
+	if (arm_smmu_ssids_in_use(&master->cd_table)) {
+		/*
+		 * If a CD table has to be present then we need to run with ATS
+		 * on even though the RID will fail ATS queries with UR. This is
+		 * because we have no idea what the PASID's need.
+		 */
+		arm_smmu_attach_prepare(master, domain, &state);
+		arm_smmu_make_cdtable_ste(ste, master, state.want_ats, s1dss);
+	} else {
+		/*
+		 * The SMMU does not support enabling ATS with bypass/abort.
+		 * When the STE is in bypass (STE.Config[2:0] == 0b100), ATS
+		 * Translation Requests and Translated transactions are denied
+		 * as though ATS is disabled for the stream (STE.EATS == 0b00),
+		 * causing F_BAD_ATS_TREQ and F_TRANSL_FORBIDDEN events
+		 * (IHI0070Ea 5.2 Stream Table Entry).
+		 */
+		state.disable_ats = true;
+		arm_smmu_attach_prepare(master, domain, &state);
+	}
 	arm_smmu_install_ste_for_dev(master, ste);
 	arm_smmu_attach_commit(master, &state);
 	mutex_unlock(&arm_smmu_asid_lock);
@@ -2843,7 +2872,6 @@ static int arm_smmu_attach_dev_ste(struct iommu_domain *domain,
 	 * descriptor from arm_smmu_share_asid().
 	 */
 	arm_smmu_clear_cd(master, IOMMU_NO_PASID);
-	return 0;
 }
 
 static int arm_smmu_attach_dev_identity(struct iommu_domain *domain,
@@ -2853,7 +2881,8 @@ static int arm_smmu_attach_dev_identity(struct iommu_domain *domain,
 	struct arm_smmu_master *master = dev_iommu_priv_get(dev);
 
 	arm_smmu_make_bypass_ste(master->smmu, &ste);
-	return arm_smmu_attach_dev_ste(domain, dev, &ste);
+	arm_smmu_attach_dev_ste(domain, dev, &ste, STRTAB_STE_1_S1DSS_BYPASS);
+	return 0;
 }
 
 static const struct iommu_domain_ops arm_smmu_identity_ops = {
@@ -2871,7 +2900,9 @@ static int arm_smmu_attach_dev_blocked(struct iommu_domain *domain,
 	struct arm_smmu_ste ste;
 
 	arm_smmu_make_abort_ste(&ste);
-	return arm_smmu_attach_dev_ste(domain, dev, &ste);
+	arm_smmu_attach_dev_ste(domain, dev, &ste,
+				STRTAB_STE_1_S1DSS_TERMINATE);
+	return 0;
 }
 
 static const struct iommu_domain_ops arm_smmu_blocked_ops = {
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
index 100e6721e16131..71ecced1db0226 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -761,8 +761,8 @@ void arm_smmu_make_abort_ste(struct arm_smmu_ste *target);
 void arm_smmu_make_bypass_ste(struct arm_smmu_device *smmu,
 			      struct arm_smmu_ste *target);
 void arm_smmu_make_cdtable_ste(struct arm_smmu_ste *target,
-			       struct arm_smmu_master *master,
-			       bool ats_enabled);
+			       struct arm_smmu_master *master, bool ats_enabled,
+			       unsigned int s1dss);
 void arm_smmu_make_s2_domain_ste(struct arm_smmu_ste *target,
 				 struct arm_smmu_master *master,
 				 struct arm_smmu_domain *smmu_domain,
-- 
2.43.2


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Re: [PATCH v7 11/14] iommu/arm-smmu-v3: Allow IDENTITY/BLOCKED to be set while PASID is used

[Nicolin Chen]

On Wed, May 08, 2024 at 03:57:19PM -0300, Jason Gunthorpe wrote:
> diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> index 15378c131a5bc7..41d7a0664a445d 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> @@ -991,6 +991,14 @@ void arm_smmu_get_ste_used(const __le64 *ent, __le64 *used_bits)
>  				    STRTAB_STE_1_S1STALLD | STRTAB_STE_1_STRW |
>  				    STRTAB_STE_1_EATS);
>  		used_bits[2] |= cpu_to_le64(STRTAB_STE_2_S2VMID);
> +
> +		/*
> +		 * See 13.5 Summary of attribute/permission configuration fields
> +		 * for the SHCFG behavior.
> +		 */
> +		if (FIELD_GET(STRTAB_STE_1_S1DSS, le64_to_cpu(ent[1])) ==
> +		    STRTAB_STE_1_S1DSS_BYPASS)
> +			used_bits[1] |= cpu_to_le64(STRTAB_STE_1_SHCFG);

Should we check ARM_SMMU_FEAT_ATTR_TYPES_OVR here as well? 

The SHCFG is RES0 when !ARM_SMMU_FEAT_ATTR_TYPES_OVR. So, the
used_bits[1] doesn't need to include it in this case?

Otherwise,

Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>

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Re: [PATCH v7 11/14] iommu/arm-smmu-v3: Allow IDENTITY/BLOCKED to be set while PASID is used

[Jason Gunthorpe]

On Mon, May 13, 2024 at 12:11:28AM -0700, Nicolin Chen wrote:
> On Wed, May 08, 2024 at 03:57:19PM -0300, Jason Gunthorpe wrote:
> > diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> > index 15378c131a5bc7..41d7a0664a445d 100644
> > --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> > +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> > @@ -991,6 +991,14 @@ void arm_smmu_get_ste_used(const __le64 *ent, __le64 *used_bits)
> >  				    STRTAB_STE_1_S1STALLD | STRTAB_STE_1_STRW |
> >  				    STRTAB_STE_1_EATS);
> >  		used_bits[2] |= cpu_to_le64(STRTAB_STE_2_S2VMID);
> > +
> > +		/*
> > +		 * See 13.5 Summary of attribute/permission configuration fields
> > +		 * for the SHCFG behavior.
> > +		 */
> > +		if (FIELD_GET(STRTAB_STE_1_S1DSS, le64_to_cpu(ent[1])) ==
> > +		    STRTAB_STE_1_S1DSS_BYPASS)
> > +			used_bits[1] |= cpu_to_le64(STRTAB_STE_1_SHCFG);
> 
> Should we check ARM_SMMU_FEAT_ATTR_TYPES_OVR here as well? 

It isn't needed, this is just checking relationships, it is up to the
make functions to set the correct bits based on things like FEAT data.

> The SHCFG is RES0 when !ARM_SMMU_FEAT_ATTR_TYPES_OVR. So, the
> used_bits[1] doesn't need to include it in this case?

In the not-supported case then the bit will always be zero from all
make functions and so this will all do nothing.

Jason

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Re: [PATCH v7 11/14] iommu/arm-smmu-v3: Allow IDENTITY/BLOCKED to be set while PASID is used

[Nicolin Chen]

On Tue, May 14, 2024 at 08:02:53PM -0300, Jason Gunthorpe wrote:
> On Mon, May 13, 2024 at 12:11:28AM -0700, Nicolin Chen wrote:
> > On Wed, May 08, 2024 at 03:57:19PM -0300, Jason Gunthorpe wrote:
> > > diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> > > index 15378c131a5bc7..41d7a0664a445d 100644
> > > --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> > > +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> > > @@ -991,6 +991,14 @@ void arm_smmu_get_ste_used(const __le64 *ent, __le64 *used_bits)
> > >  				    STRTAB_STE_1_S1STALLD | STRTAB_STE_1_STRW |
> > >  				    STRTAB_STE_1_EATS);
> > >  		used_bits[2] |= cpu_to_le64(STRTAB_STE_2_S2VMID);
> > > +
> > > +		/*
> > > +		 * See 13.5 Summary of attribute/permission configuration fields
> > > +		 * for the SHCFG behavior.
> > > +		 */
> > > +		if (FIELD_GET(STRTAB_STE_1_S1DSS, le64_to_cpu(ent[1])) ==
> > > +		    STRTAB_STE_1_S1DSS_BYPASS)
> > > +			used_bits[1] |= cpu_to_le64(STRTAB_STE_1_SHCFG);
> > 
> > Should we check ARM_SMMU_FEAT_ATTR_TYPES_OVR here as well? 
> 
> It isn't needed, this is just checking relationships, it is up to the
> make functions to set the correct bits based on things like FEAT data.
> 
> > The SHCFG is RES0 when !ARM_SMMU_FEAT_ATTR_TYPES_OVR. So, the
> > used_bits[1] doesn't need to include it in this case?
> 
> In the not-supported case then the bit will always be zero from all
> make functions and so this will all do nothing.

I see. Thanks for the clarification.

Nicolin

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[PATCH v7 12/14] iommu/arm-smmu-v3: Test the STE S1DSS functionality

[Jason Gunthorpe]

S1DSS brings in quite a few new transition pairs that are
interesting. Test to/from S1DSS_BYPASS <-> S1DSS_SSID0, and
BYPASS <-> S1DSS_SSID0.

Test a contrived non-hitless flow to make sure that the logic works.

Signed-off-by: Michael Shavit <mshavit@google.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 .../iommu/arm/arm-smmu-v3/arm-smmu-v3-test.c  | 113 +++++++++++++++++-
 1 file changed, 108 insertions(+), 5 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-test.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-test.c
index d7e022bb9df530..e0fce31eba54dd 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-test.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3-test.c
@@ -144,6 +144,14 @@ static void arm_smmu_v3_test_ste_expect_transition(
 	KUNIT_EXPECT_MEMEQ(test, target->data, cur_copy.data, sizeof(cur_copy));
 }
 
+static void arm_smmu_v3_test_ste_expect_non_hitless_transition(
+	struct kunit *test, const struct arm_smmu_ste *cur,
+	const struct arm_smmu_ste *target, unsigned int num_syncs_expected)
+{
+	arm_smmu_v3_test_ste_expect_transition(test, cur, target,
+					       num_syncs_expected, false);
+}
+
 static void arm_smmu_v3_test_ste_expect_hitless_transition(
 	struct kunit *test, const struct arm_smmu_ste *cur,
 	const struct arm_smmu_ste *target, unsigned int num_syncs_expected)
@@ -155,6 +163,7 @@ static void arm_smmu_v3_test_ste_expect_hitless_transition(
 static const dma_addr_t fake_cdtab_dma_addr = 0xF0F0F0F0F0F0;
 
 static void arm_smmu_test_make_cdtable_ste(struct arm_smmu_ste *ste,
+					   unsigned int s1dss,
 					   const dma_addr_t dma_addr)
 {
 	struct arm_smmu_master master = {
@@ -164,7 +173,7 @@ static void arm_smmu_test_make_cdtable_ste(struct arm_smmu_ste *ste,
 		.smmu = &smmu,
 	};
 
-	arm_smmu_make_cdtable_ste(ste, &master, true, STRTAB_STE_1_S1DSS_SSID0);
+	arm_smmu_make_cdtable_ste(ste, &master, true, s1dss);
 }
 
 static void arm_smmu_v3_write_ste_test_bypass_to_abort(struct kunit *test)
@@ -194,7 +203,8 @@ static void arm_smmu_v3_write_ste_test_cdtable_to_abort(struct kunit *test)
 {
 	struct arm_smmu_ste ste;
 
-	arm_smmu_test_make_cdtable_ste(&ste, fake_cdtab_dma_addr);
+	arm_smmu_test_make_cdtable_ste(&ste, STRTAB_STE_1_S1DSS_SSID0,
+				       fake_cdtab_dma_addr);
 	arm_smmu_v3_test_ste_expect_hitless_transition(test, &ste, &abort_ste,
 						       NUM_EXPECTED_SYNCS(2));
 }
@@ -203,7 +213,8 @@ static void arm_smmu_v3_write_ste_test_abort_to_cdtable(struct kunit *test)
 {
 	struct arm_smmu_ste ste;
 
-	arm_smmu_test_make_cdtable_ste(&ste, fake_cdtab_dma_addr);
+	arm_smmu_test_make_cdtable_ste(&ste, STRTAB_STE_1_S1DSS_SSID0,
+				       fake_cdtab_dma_addr);
 	arm_smmu_v3_test_ste_expect_hitless_transition(test, &abort_ste, &ste,
 						       NUM_EXPECTED_SYNCS(2));
 }
@@ -212,7 +223,8 @@ static void arm_smmu_v3_write_ste_test_cdtable_to_bypass(struct kunit *test)
 {
 	struct arm_smmu_ste ste;
 
-	arm_smmu_test_make_cdtable_ste(&ste, fake_cdtab_dma_addr);
+	arm_smmu_test_make_cdtable_ste(&ste, STRTAB_STE_1_S1DSS_SSID0,
+				       fake_cdtab_dma_addr);
 	arm_smmu_v3_test_ste_expect_hitless_transition(test, &ste, &bypass_ste,
 						       NUM_EXPECTED_SYNCS(3));
 }
@@ -221,11 +233,54 @@ static void arm_smmu_v3_write_ste_test_bypass_to_cdtable(struct kunit *test)
 {
 	struct arm_smmu_ste ste;
 
-	arm_smmu_test_make_cdtable_ste(&ste, fake_cdtab_dma_addr);
+	arm_smmu_test_make_cdtable_ste(&ste, STRTAB_STE_1_S1DSS_SSID0,
+				       fake_cdtab_dma_addr);
 	arm_smmu_v3_test_ste_expect_hitless_transition(test, &bypass_ste, &ste,
 						       NUM_EXPECTED_SYNCS(3));
 }
 
+static void arm_smmu_v3_write_ste_test_cdtable_s1dss_change(struct kunit *test)
+{
+	struct arm_smmu_ste ste;
+	struct arm_smmu_ste s1dss_bypass;
+
+	arm_smmu_test_make_cdtable_ste(&ste, STRTAB_STE_1_S1DSS_SSID0,
+				       fake_cdtab_dma_addr);
+	arm_smmu_test_make_cdtable_ste(&s1dss_bypass, STRTAB_STE_1_S1DSS_BYPASS,
+				       fake_cdtab_dma_addr);
+
+	/*
+	 * Flipping s1dss on a CD table STE only involves changes to the second
+	 * qword of an STE and can be done in a single write.
+	 */
+	arm_smmu_v3_test_ste_expect_hitless_transition(
+		test, &ste, &s1dss_bypass, NUM_EXPECTED_SYNCS(1));
+	arm_smmu_v3_test_ste_expect_hitless_transition(
+		test, &s1dss_bypass, &ste, NUM_EXPECTED_SYNCS(1));
+}
+
+static void
+arm_smmu_v3_write_ste_test_s1dssbypass_to_stebypass(struct kunit *test)
+{
+	struct arm_smmu_ste s1dss_bypass;
+
+	arm_smmu_test_make_cdtable_ste(&s1dss_bypass, STRTAB_STE_1_S1DSS_BYPASS,
+				       fake_cdtab_dma_addr);
+	arm_smmu_v3_test_ste_expect_hitless_transition(
+		test, &s1dss_bypass, &bypass_ste, NUM_EXPECTED_SYNCS(2));
+}
+
+static void
+arm_smmu_v3_write_ste_test_stebypass_to_s1dssbypass(struct kunit *test)
+{
+	struct arm_smmu_ste s1dss_bypass;
+
+	arm_smmu_test_make_cdtable_ste(&s1dss_bypass, STRTAB_STE_1_S1DSS_BYPASS,
+				       fake_cdtab_dma_addr);
+	arm_smmu_v3_test_ste_expect_hitless_transition(
+		test, &bypass_ste, &s1dss_bypass, NUM_EXPECTED_SYNCS(2));
+}
+
 static void arm_smmu_test_make_s2_ste(struct arm_smmu_ste *ste,
 				      bool ats_enabled)
 {
@@ -285,6 +340,48 @@ static void arm_smmu_v3_write_ste_test_bypass_to_s2(struct kunit *test)
 						       NUM_EXPECTED_SYNCS(2));
 }
 
+static void arm_smmu_v3_write_ste_test_s1_to_s2(struct kunit *test)
+{
+	struct arm_smmu_ste s1_ste;
+	struct arm_smmu_ste s2_ste;
+
+	arm_smmu_test_make_cdtable_ste(&s1_ste, STRTAB_STE_1_S1DSS_SSID0,
+				       fake_cdtab_dma_addr);
+	arm_smmu_test_make_s2_ste(&s2_ste, true);
+	arm_smmu_v3_test_ste_expect_hitless_transition(test, &s1_ste, &s2_ste,
+						       NUM_EXPECTED_SYNCS(3));
+}
+
+static void arm_smmu_v3_write_ste_test_s2_to_s1(struct kunit *test)
+{
+	struct arm_smmu_ste s1_ste;
+	struct arm_smmu_ste s2_ste;
+
+	arm_smmu_test_make_cdtable_ste(&s1_ste, STRTAB_STE_1_S1DSS_SSID0,
+				       fake_cdtab_dma_addr);
+	arm_smmu_test_make_s2_ste(&s2_ste, true);
+	arm_smmu_v3_test_ste_expect_hitless_transition(test, &s2_ste, &s1_ste,
+						       NUM_EXPECTED_SYNCS(3));
+}
+
+static void arm_smmu_v3_write_ste_test_non_hitless(struct kunit *test)
+{
+	struct arm_smmu_ste ste;
+	struct arm_smmu_ste ste_2;
+
+	/*
+	 * Although no flow resembles this in practice, one way to force an STE
+	 * update to be non-hitless is to change its CD table pointer as well as
+	 * s1 dss field in the same update.
+	 */
+	arm_smmu_test_make_cdtable_ste(&ste, STRTAB_STE_1_S1DSS_SSID0,
+				       fake_cdtab_dma_addr);
+	arm_smmu_test_make_cdtable_ste(&ste_2, STRTAB_STE_1_S1DSS_BYPASS,
+				       0x4B4B4b4B4B);
+	arm_smmu_v3_test_ste_expect_non_hitless_transition(
+		test, &ste, &ste_2, NUM_EXPECTED_SYNCS(3));
+}
+
 static void arm_smmu_v3_test_cd_expect_transition(
 	struct kunit *test, const struct arm_smmu_cd *cur,
 	const struct arm_smmu_cd *target, unsigned int num_syncs_expected,
@@ -438,10 +535,16 @@ static struct kunit_case arm_smmu_v3_test_cases[] = {
 	KUNIT_CASE(arm_smmu_v3_write_ste_test_abort_to_cdtable),
 	KUNIT_CASE(arm_smmu_v3_write_ste_test_cdtable_to_bypass),
 	KUNIT_CASE(arm_smmu_v3_write_ste_test_bypass_to_cdtable),
+	KUNIT_CASE(arm_smmu_v3_write_ste_test_cdtable_s1dss_change),
+	KUNIT_CASE(arm_smmu_v3_write_ste_test_s1dssbypass_to_stebypass),
+	KUNIT_CASE(arm_smmu_v3_write_ste_test_stebypass_to_s1dssbypass),
 	KUNIT_CASE(arm_smmu_v3_write_ste_test_s2_to_abort),
 	KUNIT_CASE(arm_smmu_v3_write_ste_test_abort_to_s2),
 	KUNIT_CASE(arm_smmu_v3_write_ste_test_s2_to_bypass),
 	KUNIT_CASE(arm_smmu_v3_write_ste_test_bypass_to_s2),
+	KUNIT_CASE(arm_smmu_v3_write_ste_test_s1_to_s2),
+	KUNIT_CASE(arm_smmu_v3_write_ste_test_s2_to_s1),
+	KUNIT_CASE(arm_smmu_v3_write_ste_test_non_hitless),
 	KUNIT_CASE(arm_smmu_v3_write_cd_test_s1_clear),
 	KUNIT_CASE(arm_smmu_v3_write_cd_test_s1_change_asid),
 	KUNIT_CASE(arm_smmu_v3_write_cd_test_sva_clear),
-- 
2.43.2


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Re: [PATCH v7 12/14] iommu/arm-smmu-v3: Test the STE S1DSS functionality

[Nicolin Chen]

On Wed, May 08, 2024 at 03:57:20PM -0300, Jason Gunthorpe wrote:
> S1DSS brings in quite a few new transition pairs that are
> interesting. Test to/from S1DSS_BYPASS <-> S1DSS_SSID0, and
> BYPASS <-> S1DSS_SSID0.
> 
> Test a contrived non-hitless flow to make sure that the logic works.
> 
> Signed-off-by: Michael Shavit <mshavit@google.com>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>

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[PATCH v7 13/14] iommu/arm-smmu-v3: Allow a PASID to be set when RID is IDENTITY/BLOCKED

[Jason Gunthorpe]

If the STE doesn't point to the CD table we can upgrade it by
reprogramming the STE with the appropriate S1DSS. We may also need to turn
on ATS at the same time.

Keep track if the installed STE is pointing at the cd_table and the ATS
state to trigger this path.

Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 49 ++++++++++++++++++++-
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h |  3 +-
 2 files changed, 49 insertions(+), 3 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index 41d7a0664a445d..ccc10ad3ab996d 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2435,6 +2435,9 @@ static void arm_smmu_install_ste_for_dev(struct arm_smmu_master *master,
 	master->cd_table.in_ste =
 		FIELD_GET(STRTAB_STE_0_CFG, le64_to_cpu(target->data[0])) ==
 		STRTAB_STE_0_CFG_S1_TRANS;
+	master->ste_ats_enabled =
+		FIELD_GET(STRTAB_STE_1_EATS, le64_to_cpu(target->data[1])) ==
+		STRTAB_STE_1_EATS_TRANS;
 
 	for (i = 0; i < master->num_streams; ++i) {
 		u32 sid = master->streams[i].id;
@@ -2765,10 +2768,36 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
 	return 0;
 }
 
+static void arm_smmu_update_ste(struct arm_smmu_master *master,
+				struct iommu_domain *sid_domain,
+				bool want_ats)
+{
+	unsigned int s1dss = STRTAB_STE_1_S1DSS_TERMINATE;
+	struct arm_smmu_ste ste;
+
+	if (master->cd_table.in_ste && master->ste_ats_enabled == want_ats)
+		return;
+
+	if (sid_domain->type == IOMMU_DOMAIN_IDENTITY)
+		s1dss = STRTAB_STE_1_S1DSS_BYPASS;
+	else
+		WARN_ON(sid_domain->type != IOMMU_DOMAIN_BLOCKED);
+
+	/*
+	 * Change the STE into a cdtable one with SID IDENTITY/BLOCKED behavior
+	 * using s1dss if necessary. The cd_table is already installed then
+	 * the S1DSS is correct and this will just update the EATS. Otherwise
+	 * it installs the entire thing. This will be hitless.
+	 */
+	arm_smmu_make_cdtable_ste(&ste, master, want_ats, s1dss);
+	arm_smmu_install_ste_for_dev(master, &ste);
+}
+
 int arm_smmu_set_pasid(struct arm_smmu_master *master,
 		       struct arm_smmu_domain *smmu_domain, ioasid_t pasid,
 		       const struct arm_smmu_cd *cd)
 {
+	struct iommu_domain *sid_domain = iommu_get_domain_for_dev(master->dev);
 	struct attach_state state = {
 		/*
 		 * For now the core code prevents calling this when a domain is
@@ -2784,8 +2813,10 @@ int arm_smmu_set_pasid(struct arm_smmu_master *master,
 	if (smmu_domain->smmu != master->smmu)
 		return -EINVAL;
 
-	if (!master->cd_table.in_ste)
-		return -ENODEV;
+	if (!master->cd_table.in_ste &&
+	    sid_domain->type != IOMMU_DOMAIN_IDENTITY &&
+	    sid_domain->type != IOMMU_DOMAIN_BLOCKED)
+		return -EINVAL;
 
 	cdptr = arm_smmu_alloc_cd_ptr(master, pasid);
 	if (!cdptr)
@@ -2797,6 +2828,7 @@ int arm_smmu_set_pasid(struct arm_smmu_master *master,
 		goto out_unlock;
 
 	arm_smmu_write_cd_entry(master, pasid, cdptr, cd);
+	arm_smmu_update_ste(master, sid_domain, state.want_ats);
 
 	arm_smmu_attach_commit(master, &state);
 
@@ -2819,6 +2851,19 @@ static void arm_smmu_remove_dev_pasid(struct device *dev, ioasid_t pasid,
 		arm_smmu_atc_inv_master(master, pasid);
 	arm_smmu_remove_master_domain(master, &smmu_domain->domain, pasid);
 	mutex_unlock(&arm_smmu_asid_lock);
+
+	/*
+	 * When the last user of the CD table goes away downgrade the STE back
+	 * to a non-cd_table one.
+	 */
+	if (!arm_smmu_ssids_in_use(&master->cd_table)) {
+		struct iommu_domain *sid_domain =
+			iommu_get_domain_for_dev(master->dev);
+
+		if (domain->type == IOMMU_DOMAIN_IDENTITY ||
+		    domain->type == IOMMU_DOMAIN_BLOCKED)
+			sid_domain->ops->attach_dev(sid_domain, dev);
+	}
 }
 
 static void arm_smmu_attach_dev_ste(struct iommu_domain *domain,
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
index 71ecced1db0226..3c189a48e29757 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -705,7 +705,8 @@ struct arm_smmu_master {
 	/* Locked by the iommu core using the group mutex */
 	struct arm_smmu_ctx_desc_cfg	cd_table;
 	unsigned int			num_streams;
-	bool				ats_enabled;
+	bool				ats_enabled : 1;
+	bool				ste_ats_enabled : 1;
 	bool				stall_enabled;
 	bool				sva_enabled;
 	bool				iopf_enabled;
-- 
2.43.2


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Re: [PATCH v7 13/14] iommu/arm-smmu-v3: Allow a PASID to be set when RID is IDENTITY/BLOCKED

[Nicolin Chen]

On Wed, May 08, 2024 at 03:57:21PM -0300, Jason Gunthorpe wrote:
> If the STE doesn't point to the CD table we can upgrade it by
> reprogramming the STE with the appropriate S1DSS. We may also need to turn
> on ATS at the same time.
> 
> Keep track if the installed STE is pointing at the cd_table and the ATS
> state to trigger this path.
> 
> Tested-by: Nicolin Chen <nicolinc@nvidia.com>
> Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> ---
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 49 ++++++++++++++++++++-
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h |  3 +-
>  2 files changed, 49 insertions(+), 3 deletions(-)
  
> @@ -2819,6 +2851,19 @@ static void arm_smmu_remove_dev_pasid(struct device *dev, ioasid_t pasid,
>  		arm_smmu_atc_inv_master(master, pasid);
>  	arm_smmu_remove_master_domain(master, &smmu_domain->domain, pasid);
>  	mutex_unlock(&arm_smmu_asid_lock);
> +
> +	/*
> +	 * When the last user of the CD table goes away downgrade the STE back
> +	 * to a non-cd_table one.
> +	 */
> +	if (!arm_smmu_ssids_in_use(&master->cd_table)) {
> +		struct iommu_domain *sid_domain =
> +			iommu_get_domain_for_dev(master->dev);
> +
> +		if (domain->type == IOMMU_DOMAIN_IDENTITY ||
> +		    domain->type == IOMMU_DOMAIN_BLOCKED)
> +			sid_domain->ops->attach_dev(sid_domain, dev);

Should we check against sid_domain->type instead?

Thanks
Nicolin

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Re: [PATCH v7 13/14] iommu/arm-smmu-v3: Allow a PASID to be set when RID is IDENTITY/BLOCKED

[Jason Gunthorpe]

On Mon, May 13, 2024 at 01:31:31AM -0700, Nicolin Chen wrote:
> On Wed, May 08, 2024 at 03:57:21PM -0300, Jason Gunthorpe wrote:
> > If the STE doesn't point to the CD table we can upgrade it by
> > reprogramming the STE with the appropriate S1DSS. We may also need to turn
> > on ATS at the same time.
> > 
> > Keep track if the installed STE is pointing at the cd_table and the ATS
> > state to trigger this path.
> > 
> > Tested-by: Nicolin Chen <nicolinc@nvidia.com>
> > Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
> > Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> > ---
> >  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 49 ++++++++++++++++++++-
> >  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h |  3 +-
> >  2 files changed, 49 insertions(+), 3 deletions(-)
>   
> > @@ -2819,6 +2851,19 @@ static void arm_smmu_remove_dev_pasid(struct device *dev, ioasid_t pasid,
> >  		arm_smmu_atc_inv_master(master, pasid);
> >  	arm_smmu_remove_master_domain(master, &smmu_domain->domain, pasid);
> >  	mutex_unlock(&arm_smmu_asid_lock);
> > +
> > +	/*
> > +	 * When the last user of the CD table goes away downgrade the STE back
> > +	 * to a non-cd_table one.
> > +	 */
> > +	if (!arm_smmu_ssids_in_use(&master->cd_table)) {
> > +		struct iommu_domain *sid_domain =
> > +			iommu_get_domain_for_dev(master->dev);
> > +
> > +		if (domain->type == IOMMU_DOMAIN_IDENTITY ||
> > +		    domain->type == IOMMU_DOMAIN_BLOCKED)
> > +			sid_domain->ops->attach_dev(sid_domain, dev);
> 
> Should we check against sid_domain->type instead?

Yes, I typo'd that after some edit

Thanks,
Jason

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[PATCH v7 14/14] iommu/arm-smmu-v3: Allow setting a S1 domain to a PASID

[Jason Gunthorpe]

The SVA cleanup made the SSID logic entirely general so all we need to do
is call it with the correct cd table entry for a S1 domain.

This is slightly tricky because of the ASID and how the locking works, the
simple fix is to just update the ASID once we get the right locks.

Tested-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
---
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 41 ++++++++++++++++++++-
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h |  2 +-
 2 files changed, 41 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
index ccc10ad3ab996d..9506073678bbcb 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2768,6 +2768,36 @@ static int arm_smmu_attach_dev(struct iommu_domain *domain, struct device *dev)
 	return 0;
 }
 
+static int arm_smmu_s1_set_dev_pasid(struct iommu_domain *domain,
+				      struct device *dev, ioasid_t id)
+{
+	struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
+	struct arm_smmu_master *master = dev_iommu_priv_get(dev);
+	struct arm_smmu_device *smmu = master->smmu;
+	struct arm_smmu_cd target_cd;
+	int ret = 0;
+
+	mutex_lock(&smmu_domain->init_mutex);
+	if (!smmu_domain->smmu)
+		ret = arm_smmu_domain_finalise(smmu_domain, smmu);
+	else if (smmu_domain->smmu != smmu)
+		ret = -EINVAL;
+	mutex_unlock(&smmu_domain->init_mutex);
+	if (ret)
+		return ret;
+
+	if (smmu_domain->stage != ARM_SMMU_DOMAIN_S1)
+		return -EINVAL;
+
+	/*
+	 * We can read cd.asid outside the lock because arm_smmu_set_pasid()
+	 * will fix it
+	 */
+	arm_smmu_make_s1_cd(&target_cd, master, smmu_domain);
+	return arm_smmu_set_pasid(master, to_smmu_domain(domain), id,
+				  &target_cd);
+}
+
 static void arm_smmu_update_ste(struct arm_smmu_master *master,
 				struct iommu_domain *sid_domain,
 				bool want_ats)
@@ -2795,7 +2825,7 @@ static void arm_smmu_update_ste(struct arm_smmu_master *master,
 
 int arm_smmu_set_pasid(struct arm_smmu_master *master,
 		       struct arm_smmu_domain *smmu_domain, ioasid_t pasid,
-		       const struct arm_smmu_cd *cd)
+		       struct arm_smmu_cd *cd)
 {
 	struct iommu_domain *sid_domain = iommu_get_domain_for_dev(master->dev);
 	struct attach_state state = {
@@ -2827,6 +2857,14 @@ int arm_smmu_set_pasid(struct arm_smmu_master *master,
 	if (ret)
 		goto out_unlock;
 
+	/*
+	 * We don't want to obtain to the asid_lock too early, so fix up the
+	 * caller set ASID under the lock in case it changed.
+	 */
+	cd->data[0] &= ~cpu_to_le64(CTXDESC_CD_0_ASID);
+	cd->data[0] |= cpu_to_le64(
+		FIELD_PREP(CTXDESC_CD_0_ASID, smmu_domain->cd.asid));
+
 	arm_smmu_write_cd_entry(master, pasid, cdptr, cd);
 	arm_smmu_update_ste(master, sid_domain, state.want_ats);
 
@@ -3352,6 +3390,7 @@ static struct iommu_ops arm_smmu_ops = {
 	.owner			= THIS_MODULE,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
 		.attach_dev		= arm_smmu_attach_dev,
+		.set_dev_pasid		= arm_smmu_s1_set_dev_pasid,
 		.map_pages		= arm_smmu_map_pages,
 		.unmap_pages		= arm_smmu_unmap_pages,
 		.flush_iotlb_all	= arm_smmu_flush_iotlb_all,
diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
index 3c189a48e29757..c32ac37c0b0e00 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -801,7 +801,7 @@ void arm_smmu_write_cd_entry(struct arm_smmu_master *master, int ssid,
 
 int arm_smmu_set_pasid(struct arm_smmu_master *master,
 		       struct arm_smmu_domain *smmu_domain, ioasid_t pasid,
-		       const struct arm_smmu_cd *cd);
+		       struct arm_smmu_cd *cd);
 void arm_smmu_remove_pasid(struct arm_smmu_master *master,
 			   struct arm_smmu_domain *smmu_domain, ioasid_t pasid);
 
-- 
2.43.2


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Re: [PATCH v7 14/14] iommu/arm-smmu-v3: Allow setting a S1 domain to a PASID

[Nicolin Chen]

On Wed, May 08, 2024 at 03:57:22PM -0300, Jason Gunthorpe wrote:
> The SVA cleanup made the SSID logic entirely general so all we need to do
> is call it with the correct cd table entry for a S1 domain.
> 
> This is slightly tricky because of the ASID and how the locking works, the
> simple fix is to just update the ASID once we get the right locks.
> 
> Tested-by: Nicolin Chen <nicolinc@nvidia.com>
> Tested-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>

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Re: [PATCH v7 00/14] Update SMMUv3 to the modern iommu API (part 2b/3)

[Nicolin Chen]

On Wed, May 08, 2024 at 03:57:08PM -0300, Jason Gunthorpe wrote:
 
> v7:
>  - Second half of the split series
>  - Rebase on Joerg's latest
>  - Accommodate ARM_SMMU_FEAT_ATTR_TYPES_OVR for the S1DSS code
>  - Include the S1DSS kunit tests
>  - Include hunks to adjust the unit tests to API changes from this series
>  - Move 3 BTM related patches out of this series, they can go in the BTM
>    enablement series.
>  - Move the domain_alloc_sva() conversion to the first patch, and rebase
>    on the accepted core code change
>  - Use the new core APIs for the PASID ops
>  - Revise commit messages

SVA sanity works fine with both S1DSS_SSID0 and S1DSS_BYPASS
two modes. And all 20 boot-time kunit tests passed too:

Tested-by: Nicolin Chen <nicolinc@nvidia.com>

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