[PATCH v5 0/8] iommu: Remove IOMMU_DEV_FEAT_SVA/_IOPF

[PATCH v5 0/8] iommu: Remove IOMMU_DEV_FEAT_SVA/_IOPF

[Lu Baolu]

The new method for driver fault reporting support relies on the domain
to specify a iopf_handler. The driver should detect this and setup the
HW when fault capable domains are attached.

Move SMMUv3 to use this method and have VT-D validate support during
attach so that all three fault capable drivers have a no-op FEAT_SVA and
_IOPF. Then remove them.

This was initiated by Jason. I'm following up to remove FEAT_IOPF and
further clean up.

The whole series is also available at github:
https://github.com/LuBaolu/intel-iommu/commits/iommu_no_feat-v5

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>

Change log:
v5:
 - Rebased to v6.15-rc1. No functionality change.

v4: https://lore.kernel.org/linux-iommu/20250313051953.4064532-1-baolu.lu@linux.intel.com/
 - Refined arm_smmu_disable_iopf() to improve code clarity.
 - Separate patches for vt-d refactoring have been merged.
 - All patches are based on the latest iommu/next branch to prevent
   potential merge conflicts.

v3: https://lore.kernel.org/linux-iommu/20250228092631.3425464-1-baolu.lu@linux.intel.com/
 - Series has been tested by Zhangfei Gao with arm-smmu-v3 driver.
 - Refined some code according to Kevin's suggestions.
 - No functional change.

v2: https://lore.kernel.org/linux-iommu/20250224051627.2956304-1-baolu.lu@linux.intel.com/
 - Fix removing wrong nesting master_domain in
   arm_smmu_remove_master_domain().
 - Fix iopf enable/disable in iommufd mock driver for domain
   replacement.

v1: https://lore.kernel.org/linux-iommu/20250214061104.1959525-1-baolu.lu@linux.intel.com/

Jason Gunthorpe (2):
  iommu/arm-smmu-v3: Put iopf enablement in the domain attach path
  iommu: Remove IOMMU_DEV_FEAT_SVA

Lu Baolu (6):
  iommu/vt-d: Put iopf enablement in domain attach path
  iommufd/selftest: Put iopf enablement in domain attach path
  dmaengine: idxd: Remove unnecessary IOMMU_DEV_FEAT_IOPF
  uacce: Remove unnecessary IOMMU_DEV_FEAT_IOPF
  iommufd: Remove unnecessary IOMMU_DEV_FEAT_IOPF
  iommu: Remove iommu_dev_enable/disable_feature()

 drivers/accel/amdxdna/aie2_pci.c              |  13 +-
 drivers/dma/idxd/init.c                       |  43 +-----
 drivers/iommu/amd/iommu.c                     |  34 -----
 .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c   |  86 +----------
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c   | 136 ++++++++++--------
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h   |  39 +----
 drivers/iommu/intel/iommu.c                   |  71 +++++----
 drivers/iommu/intel/iommu.h                   |  33 +++++
 drivers/iommu/intel/nested.c                  |  16 ++-
 drivers/iommu/intel/svm.c                     |   9 +-
 drivers/iommu/iommu-sva.c                     |   3 -
 drivers/iommu/iommu.c                         |  32 -----
 drivers/iommu/iommufd/device.c                |  59 ++++----
 drivers/iommu/iommufd/eventq.c                |  48 +------
 drivers/iommu/iommufd/iommufd_private.h       |   6 -
 drivers/iommu/iommufd/selftest.c              |  57 ++++++--
 drivers/misc/uacce/uacce.c                    |  40 ------
 include/linux/iommu.h                         |  35 -----
 18 files changed, 262 insertions(+), 498 deletions(-)

-- 
2.43.0

[PATCH v5 1/8] iommu/arm-smmu-v3: Put iopf enablement in the domain attach path

[Lu Baolu]

From: Jason Gunthorpe <jgg@nvidia.com>

SMMUv3 co-mingles FEAT_IOPF and FEAT_SVA behaviors so that fault reporting
doesn't work unless both are enabled. This is not correct and causes
problems for iommufd which does not enable FEAT_SVA for it's fault capable
domains.

These APIs are both obsolete, update SMMUv3 to use the new method like AMD
implements.

A driver should enable iopf support when a domain with an iopf_handler is
attached, and disable iopf support when the domain is removed.

Move the fault support logic to sva domain allocation and to domain
attach, refusing to create or attach fault capable domains if the HW
doesn't support it.

Move all the logic for controlling the iopf queue under
arm_smmu_attach_prepare(). Keep track of the number of domains on the
master (over all the SSIDs) that require iopf. When the first domain
requiring iopf is attached create the iopf queue, when the last domain is
detached destroy it.

Turn FEAT_IOPF and FEAT_SVA into no ops.

Remove the sva_lock, this is all protected by the group mutex.

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Acked-by: Will Deacon <will@kernel.org>
---
 .../iommu/arm/arm-smmu-v3/arm-smmu-v3-sva.c   |  86 +--------------
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c   | 104 +++++++++++++-----
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h   |  39 ++-----
 3 files changed, 90 insertions(+), 139 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 980cc6b33c43..0601dece0a0d 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
@@ -13,8 +13,6 @@
 #include "arm-smmu-v3.h"
 #include "../../io-pgtable-arm.h"
 
-static DEFINE_MUTEX(sva_lock);
-
 static void __maybe_unused
 arm_smmu_update_s1_domain_cd_entry(struct arm_smmu_domain *smmu_domain)
 {
@@ -257,84 +255,6 @@ bool arm_smmu_sva_supported(struct arm_smmu_device *smmu)
 	return true;
 }
 
-bool arm_smmu_master_iopf_supported(struct arm_smmu_master *master)
-{
-	/* We're not keeping track of SIDs in fault events */
-	if (master->num_streams != 1)
-		return false;
-
-	return master->stall_enabled;
-}
-
-bool arm_smmu_master_sva_supported(struct arm_smmu_master *master)
-{
-	if (!(master->smmu->features & ARM_SMMU_FEAT_SVA))
-		return false;
-
-	/* SSID support is mandatory for the moment */
-	return master->ssid_bits;
-}
-
-bool arm_smmu_master_sva_enabled(struct arm_smmu_master *master)
-{
-	bool enabled;
-
-	mutex_lock(&sva_lock);
-	enabled = master->sva_enabled;
-	mutex_unlock(&sva_lock);
-	return enabled;
-}
-
-static int arm_smmu_master_sva_enable_iopf(struct arm_smmu_master *master)
-{
-	struct device *dev = master->dev;
-
-	/*
-	 * Drivers for devices supporting PRI or stall should enable IOPF first.
-	 * Others have device-specific fault handlers and don't need IOPF.
-	 */
-	if (!arm_smmu_master_iopf_supported(master))
-		return 0;
-
-	if (!master->iopf_enabled)
-		return -EINVAL;
-
-	return iopf_queue_add_device(master->smmu->evtq.iopf, dev);
-}
-
-static void arm_smmu_master_sva_disable_iopf(struct arm_smmu_master *master)
-{
-	struct device *dev = master->dev;
-
-	if (!master->iopf_enabled)
-		return;
-
-	iopf_queue_remove_device(master->smmu->evtq.iopf, dev);
-}
-
-int arm_smmu_master_enable_sva(struct arm_smmu_master *master)
-{
-	int ret;
-
-	mutex_lock(&sva_lock);
-	ret = arm_smmu_master_sva_enable_iopf(master);
-	if (!ret)
-		master->sva_enabled = true;
-	mutex_unlock(&sva_lock);
-
-	return ret;
-}
-
-int arm_smmu_master_disable_sva(struct arm_smmu_master *master)
-{
-	mutex_lock(&sva_lock);
-	arm_smmu_master_sva_disable_iopf(master);
-	master->sva_enabled = false;
-	mutex_unlock(&sva_lock);
-
-	return 0;
-}
-
 void arm_smmu_sva_notifier_synchronize(void)
 {
 	/*
@@ -353,6 +273,9 @@ static int arm_smmu_sva_set_dev_pasid(struct iommu_domain *domain,
 	struct arm_smmu_cd target;
 	int ret;
 
+	if (!(master->smmu->features & ARM_SMMU_FEAT_SVA))
+		return -EOPNOTSUPP;
+
 	/* Prevent arm_smmu_mm_release from being called while we are attaching */
 	if (!mmget_not_zero(domain->mm))
 		return -EINVAL;
@@ -406,6 +329,9 @@ struct iommu_domain *arm_smmu_sva_domain_alloc(struct device *dev,
 	u32 asid;
 	int ret;
 
+	if (!(master->smmu->features & ARM_SMMU_FEAT_SVA))
+		return ERR_PTR(-EOPNOTSUPP);
+
 	smmu_domain = arm_smmu_domain_alloc();
 	if (IS_ERR(smmu_domain))
 		return ERR_CAST(smmu_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 48d910399a1b..6cb875f98905 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -2720,6 +2720,7 @@ 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 iommu_domain *domain,
 			    struct arm_smmu_master *master,
 			    ioasid_t ssid, bool nested_ats_flush)
 {
@@ -2730,6 +2731,7 @@ 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 &&
+		    master_domain->domain == domain &&
 		    master_domain->ssid == ssid &&
 		    master_domain->nested_ats_flush == nested_ats_flush)
 			return master_domain;
@@ -2756,6 +2758,58 @@ to_smmu_domain_devices(struct iommu_domain *domain)
 	return NULL;
 }
 
+static int arm_smmu_enable_iopf(struct arm_smmu_master *master,
+				struct arm_smmu_master_domain *master_domain)
+{
+	int ret;
+
+	iommu_group_mutex_assert(master->dev);
+
+	if (!IS_ENABLED(CONFIG_ARM_SMMU_V3_SVA))
+		return -EOPNOTSUPP;
+
+	/*
+	 * Drivers for devices supporting PRI or stall require iopf others have
+	 * device-specific fault handlers and don't need IOPF, so this is not a
+	 * failure.
+	 */
+	if (!master->stall_enabled)
+		return 0;
+
+	/* We're not keeping track of SIDs in fault events */
+	if (master->num_streams != 1)
+		return -EOPNOTSUPP;
+
+	if (master->iopf_refcount) {
+		master->iopf_refcount++;
+		master_domain->using_iopf = true;
+		return 0;
+	}
+
+	ret = iopf_queue_add_device(master->smmu->evtq.iopf, master->dev);
+	if (ret)
+		return ret;
+	master->iopf_refcount = 1;
+	master_domain->using_iopf = true;
+	return 0;
+}
+
+static void arm_smmu_disable_iopf(struct arm_smmu_master *master,
+				  struct arm_smmu_master_domain *master_domain)
+{
+	iommu_group_mutex_assert(master->dev);
+
+	if (!IS_ENABLED(CONFIG_ARM_SMMU_V3_SVA))
+		return;
+
+	if (!master_domain || !master_domain->using_iopf)
+		return;
+
+	master->iopf_refcount--;
+	if (master->iopf_refcount == 0)
+		iopf_queue_remove_device(master->smmu->evtq.iopf, master->dev);
+}
+
 static void arm_smmu_remove_master_domain(struct arm_smmu_master *master,
 					  struct iommu_domain *domain,
 					  ioasid_t ssid)
@@ -2772,15 +2826,17 @@ static void arm_smmu_remove_master_domain(struct arm_smmu_master *master,
 		nested_ats_flush = to_smmu_nested_domain(domain)->enable_ats;
 
 	spin_lock_irqsave(&smmu_domain->devices_lock, flags);
-	master_domain = arm_smmu_find_master_domain(smmu_domain, master, ssid,
-						    nested_ats_flush);
+	master_domain = arm_smmu_find_master_domain(smmu_domain, domain, master,
+						    ssid, nested_ats_flush);
 	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);
+
+	arm_smmu_disable_iopf(master, master_domain);
+	kfree(master_domain);
 }
 
 /*
@@ -2853,12 +2909,19 @@ int arm_smmu_attach_prepare(struct arm_smmu_attach_state *state,
 			kfree(state->vmaster);
 			return -ENOMEM;
 		}
+		master_domain->domain = new_domain;
 		master_domain->master = master;
 		master_domain->ssid = state->ssid;
 		if (new_domain->type == IOMMU_DOMAIN_NESTED)
 			master_domain->nested_ats_flush =
 				to_smmu_nested_domain(new_domain)->enable_ats;
 
+		if (new_domain->iopf_handler) {
+			ret = arm_smmu_enable_iopf(master, master_domain);
+			if (ret)
+				goto err_free_master_domain;
+		}
+
 		/*
 		 * During prepare we want the current smmu_domain and new
 		 * smmu_domain to be in the devices list before we change any
@@ -2878,9 +2941,9 @@ int arm_smmu_attach_prepare(struct arm_smmu_attach_state *state,
 		    !arm_smmu_master_canwbs(master)) {
 			spin_unlock_irqrestore(&smmu_domain->devices_lock,
 					       flags);
-			kfree(master_domain);
 			kfree(state->vmaster);
-			return -EINVAL;
+			ret = -EINVAL;
+			goto err_iopf;
 		}
 
 		if (state->ats_enabled)
@@ -2899,6 +2962,12 @@ int arm_smmu_attach_prepare(struct arm_smmu_attach_state *state,
 		wmb();
 	}
 	return 0;
+
+err_iopf:
+	arm_smmu_disable_iopf(master, master_domain);
+err_free_master_domain:
+	kfree(master_domain);
+	return ret;
 }
 
 /*
@@ -3510,8 +3579,7 @@ static void arm_smmu_release_device(struct device *dev)
 {
 	struct arm_smmu_master *master = dev_iommu_priv_get(dev);
 
-	if (WARN_ON(arm_smmu_master_sva_enabled(master)))
-		iopf_queue_remove_device(master->smmu->evtq.iopf, dev);
+	WARN_ON(master->iopf_refcount);
 
 	/* Put the STE back to what arm_smmu_init_strtab() sets */
 	if (dev->iommu->require_direct)
@@ -3596,18 +3664,8 @@ static int arm_smmu_dev_enable_feature(struct device *dev,
 
 	switch (feat) {
 	case IOMMU_DEV_FEAT_IOPF:
-		if (!arm_smmu_master_iopf_supported(master))
-			return -EINVAL;
-		if (master->iopf_enabled)
-			return -EBUSY;
-		master->iopf_enabled = true;
-		return 0;
 	case IOMMU_DEV_FEAT_SVA:
-		if (!arm_smmu_master_sva_supported(master))
-			return -EINVAL;
-		if (arm_smmu_master_sva_enabled(master))
-			return -EBUSY;
-		return arm_smmu_master_enable_sva(master);
+		return 0;
 	default:
 		return -EINVAL;
 	}
@@ -3623,16 +3681,8 @@ static int arm_smmu_dev_disable_feature(struct device *dev,
 
 	switch (feat) {
 	case IOMMU_DEV_FEAT_IOPF:
-		if (!master->iopf_enabled)
-			return -EINVAL;
-		if (master->sva_enabled)
-			return -EBUSY;
-		master->iopf_enabled = false;
-		return 0;
 	case IOMMU_DEV_FEAT_SVA:
-		if (!arm_smmu_master_sva_enabled(master))
-			return -EINVAL;
-		return arm_smmu_master_disable_sva(master);
+		return 0;
 	default:
 		return -EINVAL;
 	}
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 dd1ad56ce863..ea41d790463e 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h
@@ -837,9 +837,8 @@ struct arm_smmu_master {
 	bool				ats_enabled : 1;
 	bool				ste_ats_enabled : 1;
 	bool				stall_enabled;
-	bool				sva_enabled;
-	bool				iopf_enabled;
 	unsigned int			ssid_bits;
+	unsigned int			iopf_refcount;
 };
 
 /* SMMU private data for an IOMMU domain */
@@ -915,8 +914,14 @@ 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;
+	/*
+	 * For nested domains the master_domain is threaded onto the S2 parent,
+	 * this points to the IOMMU_DOMAIN_NESTED to disambiguate the masters.
+	 */
+	struct iommu_domain *domain;
 	ioasid_t ssid;
 	bool nested_ats_flush : 1;
+	bool using_iopf : 1;
 };
 
 static inline struct arm_smmu_domain *to_smmu_domain(struct iommu_domain *dom)
@@ -995,11 +1000,6 @@ int arm_smmu_cmdq_issue_cmdlist(struct arm_smmu_device *smmu,
 
 #ifdef CONFIG_ARM_SMMU_V3_SVA
 bool arm_smmu_sva_supported(struct arm_smmu_device *smmu);
-bool arm_smmu_master_sva_supported(struct arm_smmu_master *master);
-bool arm_smmu_master_sva_enabled(struct arm_smmu_master *master);
-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(struct device *dev,
 					       struct mm_struct *mm);
@@ -1009,31 +1009,6 @@ static inline bool arm_smmu_sva_supported(struct arm_smmu_device *smmu)
 	return false;
 }
 
-static inline bool arm_smmu_master_sva_supported(struct arm_smmu_master *master)
-{
-	return false;
-}
-
-static inline bool arm_smmu_master_sva_enabled(struct arm_smmu_master *master)
-{
-	return false;
-}
-
-static inline int arm_smmu_master_enable_sva(struct arm_smmu_master *master)
-{
-	return -ENODEV;
-}
-
-static inline int arm_smmu_master_disable_sva(struct arm_smmu_master *master)
-{
-	return -ENODEV;
-}
-
-static inline bool arm_smmu_master_iopf_supported(struct arm_smmu_master *master)
-{
-	return false;
-}
-
 static inline void arm_smmu_sva_notifier_synchronize(void) {}
 
 #define arm_smmu_sva_domain_alloc NULL
-- 
2.43.0

[PATCH v5 2/8] iommu: Remove IOMMU_DEV_FEAT_SVA

[Lu Baolu]

From: Jason Gunthorpe <jgg@nvidia.com>

None of the drivers implement anything here anymore, remove the dead code.

Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
---
 drivers/accel/amdxdna/aie2_pci.c            | 13 ++-----------
 drivers/dma/idxd/init.c                     |  8 +-------
 drivers/iommu/amd/iommu.c                   |  2 --
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c |  2 --
 drivers/iommu/intel/iommu.c                 |  6 ------
 drivers/iommu/iommu-sva.c                   |  3 ---
 drivers/misc/uacce/uacce.c                  |  9 ---------
 include/linux/iommu.h                       |  9 +--------
 8 files changed, 4 insertions(+), 48 deletions(-)

diff --git a/drivers/accel/amdxdna/aie2_pci.c b/drivers/accel/amdxdna/aie2_pci.c
index 5a058e565b01..c6cf7068d23c 100644
--- a/drivers/accel/amdxdna/aie2_pci.c
+++ b/drivers/accel/amdxdna/aie2_pci.c
@@ -512,12 +512,6 @@ static int aie2_init(struct amdxdna_dev *xdna)
 		goto release_fw;
 	}
 
-	ret = iommu_dev_enable_feature(&pdev->dev, IOMMU_DEV_FEAT_SVA);
-	if (ret) {
-		XDNA_ERR(xdna, "Enable PASID failed, ret %d", ret);
-		goto free_irq;
-	}
-
 	psp_conf.fw_size = fw->size;
 	psp_conf.fw_buf = fw->data;
 	for (i = 0; i < PSP_MAX_REGS; i++)
@@ -526,14 +520,14 @@ static int aie2_init(struct amdxdna_dev *xdna)
 	if (!ndev->psp_hdl) {
 		XDNA_ERR(xdna, "failed to create psp");
 		ret = -ENOMEM;
-		goto disable_sva;
+		goto free_irq;
 	}
 	xdna->dev_handle = ndev;
 
 	ret = aie2_hw_start(xdna);
 	if (ret) {
 		XDNA_ERR(xdna, "start npu failed, ret %d", ret);
-		goto disable_sva;
+		goto free_irq;
 	}
 
 	ret = aie2_mgmt_fw_query(ndev);
@@ -584,8 +578,6 @@ static int aie2_init(struct amdxdna_dev *xdna)
 	aie2_error_async_events_free(ndev);
 stop_hw:
 	aie2_hw_stop(xdna);
-disable_sva:
-	iommu_dev_disable_feature(&pdev->dev, IOMMU_DEV_FEAT_SVA);
 free_irq:
 	pci_free_irq_vectors(pdev);
 release_fw:
@@ -601,7 +593,6 @@ static void aie2_fini(struct amdxdna_dev *xdna)
 
 	aie2_hw_stop(xdna);
 	aie2_error_async_events_free(ndev);
-	iommu_dev_disable_feature(&pdev->dev, IOMMU_DEV_FEAT_SVA);
 	pci_free_irq_vectors(pdev);
 }
 
diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c
index fca1d2924999..2d3d580b9987 100644
--- a/drivers/dma/idxd/init.c
+++ b/drivers/dma/idxd/init.c
@@ -633,17 +633,11 @@ static int idxd_enable_sva(struct pci_dev *pdev)
 	ret = iommu_dev_enable_feature(&pdev->dev, IOMMU_DEV_FEAT_IOPF);
 	if (ret)
 		return ret;
-
-	ret = iommu_dev_enable_feature(&pdev->dev, IOMMU_DEV_FEAT_SVA);
-	if (ret)
-		iommu_dev_disable_feature(&pdev->dev, IOMMU_DEV_FEAT_IOPF);
-
-	return ret;
+	return 0;
 }
 
 static void idxd_disable_sva(struct pci_dev *pdev)
 {
-	iommu_dev_disable_feature(&pdev->dev, IOMMU_DEV_FEAT_SVA);
 	iommu_dev_disable_feature(&pdev->dev, IOMMU_DEV_FEAT_IOPF);
 }
 
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index dea0fed7abb0..17aab6d04a13 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -2991,7 +2991,6 @@ static int amd_iommu_dev_enable_feature(struct device *dev,
 
 	switch (feat) {
 	case IOMMU_DEV_FEAT_IOPF:
-	case IOMMU_DEV_FEAT_SVA:
 		break;
 	default:
 		ret = -EINVAL;
@@ -3007,7 +3006,6 @@ static int amd_iommu_dev_disable_feature(struct device *dev,
 
 	switch (feat) {
 	case IOMMU_DEV_FEAT_IOPF:
-	case IOMMU_DEV_FEAT_SVA:
 		break;
 	default:
 		ret = -EINVAL;
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 6cb875f98905..73f9885d20f1 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -3664,7 +3664,6 @@ static int arm_smmu_dev_enable_feature(struct device *dev,
 
 	switch (feat) {
 	case IOMMU_DEV_FEAT_IOPF:
-	case IOMMU_DEV_FEAT_SVA:
 		return 0;
 	default:
 		return -EINVAL;
@@ -3681,7 +3680,6 @@ static int arm_smmu_dev_disable_feature(struct device *dev,
 
 	switch (feat) {
 	case IOMMU_DEV_FEAT_IOPF:
-	case IOMMU_DEV_FEAT_SVA:
 		return 0;
 	default:
 		return -EINVAL;
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 857c431d8ec5..4c3be92804e2 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -3956,9 +3956,6 @@ intel_iommu_dev_enable_feat(struct device *dev, enum iommu_dev_features feat)
 	case IOMMU_DEV_FEAT_IOPF:
 		return intel_iommu_enable_iopf(dev);
 
-	case IOMMU_DEV_FEAT_SVA:
-		return 0;
-
 	default:
 		return -ENODEV;
 	}
@@ -3972,9 +3969,6 @@ intel_iommu_dev_disable_feat(struct device *dev, enum iommu_dev_features feat)
 		intel_iommu_disable_iopf(dev);
 		return 0;
 
-	case IOMMU_DEV_FEAT_SVA:
-		return 0;
-
 	default:
 		return -ENODEV;
 	}
diff --git a/drivers/iommu/iommu-sva.c b/drivers/iommu/iommu-sva.c
index ab18bc494eef..944daa0dabd6 100644
--- a/drivers/iommu/iommu-sva.c
+++ b/drivers/iommu/iommu-sva.c
@@ -63,9 +63,6 @@ static struct iommu_mm_data *iommu_alloc_mm_data(struct mm_struct *mm, struct de
  * reference is taken. Caller must call iommu_sva_unbind_device()
  * to release each reference.
  *
- * iommu_dev_enable_feature(dev, IOMMU_DEV_FEAT_SVA) must be called first, to
- * initialize the required SVA features.
- *
  * On error, returns an ERR_PTR value.
  */
 struct iommu_sva *iommu_sva_bind_device(struct device *dev, struct mm_struct *mm)
diff --git a/drivers/misc/uacce/uacce.c b/drivers/misc/uacce/uacce.c
index bdc2e6fda782..2a1db2abeeca 100644
--- a/drivers/misc/uacce/uacce.c
+++ b/drivers/misc/uacce/uacce.c
@@ -479,14 +479,6 @@ static unsigned int uacce_enable_sva(struct device *parent, unsigned int flags)
 		dev_err(parent, "failed to enable IOPF feature! ret = %pe\n", ERR_PTR(ret));
 		return flags;
 	}
-
-	ret = iommu_dev_enable_feature(parent, IOMMU_DEV_FEAT_SVA);
-	if (ret) {
-		dev_err(parent, "failed to enable SVA feature! ret = %pe\n", ERR_PTR(ret));
-		iommu_dev_disable_feature(parent, IOMMU_DEV_FEAT_IOPF);
-		return flags;
-	}
-
 	return flags | UACCE_DEV_SVA;
 }
 
@@ -495,7 +487,6 @@ static void uacce_disable_sva(struct uacce_device *uacce)
 	if (!(uacce->flags & UACCE_DEV_SVA))
 		return;
 
-	iommu_dev_disable_feature(uacce->parent, IOMMU_DEV_FEAT_SVA);
 	iommu_dev_disable_feature(uacce->parent, IOMMU_DEV_FEAT_IOPF);
 }
 
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 7e8c2af89799..bfdd2e71e124 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -318,18 +318,11 @@ struct iommu_iort_rmr_data {
 
 /**
  * enum iommu_dev_features - Per device IOMMU features
- * @IOMMU_DEV_FEAT_SVA: Shared Virtual Addresses
- * @IOMMU_DEV_FEAT_IOPF: I/O Page Faults such as PRI or Stall. Generally
- *			 enabling %IOMMU_DEV_FEAT_SVA requires
- *			 %IOMMU_DEV_FEAT_IOPF, but some devices manage I/O Page
- *			 Faults themselves instead of relying on the IOMMU. When
- *			 supported, this feature must be enabled before and
- *			 disabled after %IOMMU_DEV_FEAT_SVA.
+ * @IOMMU_DEV_FEAT_IOPF: I/O Page Faults such as PRI or Stall.
  *
  * Device drivers enable a feature using iommu_dev_enable_feature().
  */
 enum iommu_dev_features {
-	IOMMU_DEV_FEAT_SVA,
 	IOMMU_DEV_FEAT_IOPF,
 };
 
-- 
2.43.0

[PATCH v5 3/8] iommu/vt-d: Put iopf enablement in domain attach path

[Lu Baolu]

Update iopf enablement in the driver to use the new method, similar to
the arm-smmu-v3 driver. Enable iopf support when any domain with an
iopf_handler is attached, and disable it when the domain is removed.

Place all the logic for controlling the PRI and iopf queue in the domain
set/remove/replace paths. Keep track of the number of domains set to the
device and PASIDs that require iopf. When the first domain requiring iopf
is attached, add the device to the iopf queue and enable PRI. When the
last domain is removed, remove it from the iopf queue and disable PRI.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
---
 drivers/iommu/intel/iommu.c  | 42 ++++++++++++++++++++++++++++++------
 drivers/iommu/intel/iommu.h  | 33 ++++++++++++++++++++++++++++
 drivers/iommu/intel/nested.c | 16 ++++++++++++--
 drivers/iommu/intel/svm.c    |  9 ++++++--
 4 files changed, 90 insertions(+), 10 deletions(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 4c3be92804e2..9af558390d42 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -3284,6 +3284,9 @@ void device_block_translation(struct device *dev)
 static int blocking_domain_attach_dev(struct iommu_domain *domain,
 				      struct device *dev)
 {
+	struct device_domain_info *info = dev_iommu_priv_get(dev);
+
+	iopf_for_domain_remove(info->domain ? &info->domain->domain : NULL, dev);
 	device_block_translation(dev);
 	return 0;
 }
@@ -3494,7 +3497,15 @@ static int intel_iommu_attach_device(struct iommu_domain *domain,
 	if (ret)
 		return ret;
 
-	return dmar_domain_attach_device(to_dmar_domain(domain), dev);
+	ret = iopf_for_domain_set(domain, dev);
+	if (ret)
+		return ret;
+
+	ret = dmar_domain_attach_device(to_dmar_domain(domain), dev);
+	if (ret)
+		iopf_for_domain_remove(domain, dev);
+
+	return ret;
 }
 
 static int intel_iommu_map(struct iommu_domain *domain,
@@ -3921,6 +3932,8 @@ int intel_iommu_enable_iopf(struct device *dev)
 	if (!info->pri_enabled)
 		return -ENODEV;
 
+	/* pri_enabled is protected by the group mutex. */
+	iommu_group_mutex_assert(dev);
 	if (info->iopf_refcount) {
 		info->iopf_refcount++;
 		return 0;
@@ -3943,6 +3956,7 @@ void intel_iommu_disable_iopf(struct device *dev)
 	if (WARN_ON(!info->pri_enabled || !info->iopf_refcount))
 		return;
 
+	iommu_group_mutex_assert(dev);
 	if (--info->iopf_refcount)
 		return;
 
@@ -3954,8 +3968,7 @@ intel_iommu_dev_enable_feat(struct device *dev, enum iommu_dev_features feat)
 {
 	switch (feat) {
 	case IOMMU_DEV_FEAT_IOPF:
-		return intel_iommu_enable_iopf(dev);
-
+		return 0;
 	default:
 		return -ENODEV;
 	}
@@ -3966,7 +3979,6 @@ intel_iommu_dev_disable_feat(struct device *dev, enum iommu_dev_features feat)
 {
 	switch (feat) {
 	case IOMMU_DEV_FEAT_IOPF:
-		intel_iommu_disable_iopf(dev);
 		return 0;
 
 	default:
@@ -4047,6 +4059,7 @@ static int blocking_domain_set_dev_pasid(struct iommu_domain *domain,
 {
 	struct device_domain_info *info = dev_iommu_priv_get(dev);
 
+	iopf_for_domain_remove(old, dev);
 	intel_pasid_tear_down_entry(info->iommu, dev, pasid, false);
 	domain_remove_dev_pasid(old, dev, pasid);
 
@@ -4120,6 +4133,10 @@ static int intel_iommu_set_dev_pasid(struct iommu_domain *domain,
 	if (IS_ERR(dev_pasid))
 		return PTR_ERR(dev_pasid);
 
+	ret = iopf_for_domain_replace(domain, old, dev);
+	if (ret)
+		goto out_remove_dev_pasid;
+
 	if (dmar_domain->use_first_level)
 		ret = domain_setup_first_level(iommu, dmar_domain,
 					       dev, pasid, old);
@@ -4127,7 +4144,7 @@ static int intel_iommu_set_dev_pasid(struct iommu_domain *domain,
 		ret = domain_setup_second_level(iommu, dmar_domain,
 						dev, pasid, old);
 	if (ret)
-		goto out_remove_dev_pasid;
+		goto out_unwind_iopf;
 
 	domain_remove_dev_pasid(old, dev, pasid);
 
@@ -4135,6 +4152,8 @@ static int intel_iommu_set_dev_pasid(struct iommu_domain *domain,
 
 	return 0;
 
+out_unwind_iopf:
+	iopf_for_domain_replace(old, domain, dev);
 out_remove_dev_pasid:
 	domain_remove_dev_pasid(domain, dev, pasid);
 	return ret;
@@ -4349,6 +4368,11 @@ static int identity_domain_attach_dev(struct iommu_domain *domain, struct device
 	if (dev_is_real_dma_subdevice(dev))
 		return 0;
 
+	/*
+	 * No PRI support with the global identity domain. No need to enable or
+	 * disable PRI in this path as the iommu has been put in the blocking
+	 * state.
+	 */
 	if (sm_supported(iommu))
 		ret = intel_pasid_setup_pass_through(iommu, dev, IOMMU_NO_PASID);
 	else
@@ -4368,9 +4392,15 @@ static int identity_domain_set_dev_pasid(struct iommu_domain *domain,
 	if (!pasid_supported(iommu) || dev_is_real_dma_subdevice(dev))
 		return -EOPNOTSUPP;
 
+	ret = iopf_for_domain_replace(domain, old, dev);
+	if (ret)
+		return ret;
+
 	ret = domain_setup_passthrough(iommu, dev, pasid, old);
-	if (ret)
+	if (ret) {
+		iopf_for_domain_replace(old, domain, dev);
 		return ret;
+	}
 
 	domain_remove_dev_pasid(old, dev, pasid);
 	return 0;
diff --git a/drivers/iommu/intel/iommu.h b/drivers/iommu/intel/iommu.h
index 8d5d85bf0080..f9dcf0ab93d1 100644
--- a/drivers/iommu/intel/iommu.h
+++ b/drivers/iommu/intel/iommu.h
@@ -1297,6 +1297,39 @@ void intel_iommu_drain_pasid_prq(struct device *dev, u32 pasid);
 int intel_iommu_enable_iopf(struct device *dev);
 void intel_iommu_disable_iopf(struct device *dev);
 
+static inline int iopf_for_domain_set(struct iommu_domain *domain,
+				      struct device *dev)
+{
+	if (!domain || !domain->iopf_handler)
+		return 0;
+
+	return intel_iommu_enable_iopf(dev);
+}
+
+static inline void iopf_for_domain_remove(struct iommu_domain *domain,
+					  struct device *dev)
+{
+	if (!domain || !domain->iopf_handler)
+		return;
+
+	intel_iommu_disable_iopf(dev);
+}
+
+static inline int iopf_for_domain_replace(struct iommu_domain *new,
+					  struct iommu_domain *old,
+					  struct device *dev)
+{
+	int ret;
+
+	ret = iopf_for_domain_set(new, dev);
+	if (ret)
+		return ret;
+
+	iopf_for_domain_remove(old, dev);
+
+	return 0;
+}
+
 #ifdef CONFIG_INTEL_IOMMU_SVM
 void intel_svm_check(struct intel_iommu *iommu);
 struct iommu_domain *intel_svm_domain_alloc(struct device *dev,
diff --git a/drivers/iommu/intel/nested.c b/drivers/iommu/intel/nested.c
index 6ac5c534bef4..d2a94025d0a0 100644
--- a/drivers/iommu/intel/nested.c
+++ b/drivers/iommu/intel/nested.c
@@ -56,10 +56,14 @@ static int intel_nested_attach_dev(struct iommu_domain *domain,
 	if (ret)
 		goto detach_iommu;
 
+	ret = iopf_for_domain_set(domain, dev);
+	if (ret)
+		goto unassign_tag;
+
 	ret = intel_pasid_setup_nested(iommu, dev,
 				       IOMMU_NO_PASID, dmar_domain);
 	if (ret)
-		goto unassign_tag;
+		goto disable_iopf;
 
 	info->domain = dmar_domain;
 	spin_lock_irqsave(&dmar_domain->lock, flags);
@@ -67,6 +71,8 @@ static int intel_nested_attach_dev(struct iommu_domain *domain,
 	spin_unlock_irqrestore(&dmar_domain->lock, flags);
 
 	return 0;
+disable_iopf:
+	iopf_for_domain_remove(domain, dev);
 unassign_tag:
 	cache_tag_unassign_domain(dmar_domain, dev, IOMMU_NO_PASID);
 detach_iommu:
@@ -166,14 +172,20 @@ static int intel_nested_set_dev_pasid(struct iommu_domain *domain,
 	if (IS_ERR(dev_pasid))
 		return PTR_ERR(dev_pasid);
 
-	ret = domain_setup_nested(iommu, dmar_domain, dev, pasid, old);
+	ret = iopf_for_domain_replace(domain, old, dev);
 	if (ret)
 		goto out_remove_dev_pasid;
 
+	ret = domain_setup_nested(iommu, dmar_domain, dev, pasid, old);
+	if (ret)
+		goto out_unwind_iopf;
+
 	domain_remove_dev_pasid(old, dev, pasid);
 
 	return 0;
 
+out_unwind_iopf:
+	iopf_for_domain_replace(old, domain, dev);
 out_remove_dev_pasid:
 	domain_remove_dev_pasid(domain, dev, pasid);
 	return ret;
diff --git a/drivers/iommu/intel/svm.c b/drivers/iommu/intel/svm.c
index ba93123cb4eb..f3da596410b5 100644
--- a/drivers/iommu/intel/svm.c
+++ b/drivers/iommu/intel/svm.c
@@ -164,18 +164,23 @@ static int intel_svm_set_dev_pasid(struct iommu_domain *domain,
 	if (IS_ERR(dev_pasid))
 		return PTR_ERR(dev_pasid);
 
+	ret = iopf_for_domain_replace(domain, old, dev);
+	if (ret)
+		goto out_remove_dev_pasid;
+
 	/* Setup the pasid table: */
 	sflags = cpu_feature_enabled(X86_FEATURE_LA57) ? PASID_FLAG_FL5LP : 0;
 	ret = __domain_setup_first_level(iommu, dev, pasid,
 					 FLPT_DEFAULT_DID, mm->pgd,
 					 sflags, old);
 	if (ret)
-		goto out_remove_dev_pasid;
+		goto out_unwind_iopf;
 
 	domain_remove_dev_pasid(old, dev, pasid);
 
 	return 0;
-
+out_unwind_iopf:
+	iopf_for_domain_replace(old, domain, dev);
 out_remove_dev_pasid:
 	domain_remove_dev_pasid(domain, dev, pasid);
 	return ret;
-- 
2.43.0

[PATCH v5 4/8] iommufd/selftest: Put iopf enablement in domain attach path

[Lu Baolu]

Update iopf enablement in the iommufd mock device driver to use the new
method, similar to the arm-smmu-v3 driver. Enable iopf support when any
domain with an iopf_handler is attached, and disable it when the domain
is removed.

Add a refcount in the mock device state structure to keep track of the
number of domains set to the device and PASIDs that require iopf.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Reviewed-by: Nicolin Chen <nicolinc@nvidia.com>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
---
 drivers/iommu/iommufd/selftest.c | 57 ++++++++++++++++++++++++++------
 1 file changed, 47 insertions(+), 10 deletions(-)

diff --git a/drivers/iommu/iommufd/selftest.c b/drivers/iommu/iommufd/selftest.c
index 18d9a216eb30..6bd0abf9a641 100644
--- a/drivers/iommu/iommufd/selftest.c
+++ b/drivers/iommu/iommufd/selftest.c
@@ -58,6 +58,9 @@ enum {
 	MOCK_PFN_HUGE_IOVA = _MOCK_PFN_START << 2,
 };
 
+static int mock_dev_enable_iopf(struct device *dev, struct iommu_domain *domain);
+static void mock_dev_disable_iopf(struct device *dev, struct iommu_domain *domain);
+
 /*
  * Syzkaller has trouble randomizing the correct iova to use since it is linked
  * to the map ioctl's output, and it has no ide about that. So, simplify things.
@@ -168,6 +171,8 @@ struct mock_dev {
 	int id;
 	u32 cache[MOCK_DEV_CACHE_NUM];
 	atomic_t pasid_1024_fake_error;
+	unsigned int iopf_refcount;
+	struct iommu_domain *domain;
 };
 
 static inline struct mock_dev *to_mock_dev(struct device *dev)
@@ -221,6 +226,13 @@ static int mock_domain_nop_attach(struct iommu_domain *domain,
 		up_write(&mdev->viommu_rwsem);
 	}
 
+	rc = mock_dev_enable_iopf(dev, domain);
+	if (rc)
+		return rc;
+
+	mock_dev_disable_iopf(dev, mdev->domain);
+	mdev->domain = domain;
+
 	return 0;
 }
 
@@ -229,6 +241,7 @@ static int mock_domain_set_dev_pasid_nop(struct iommu_domain *domain,
 					 struct iommu_domain *old)
 {
 	struct mock_dev *mdev = to_mock_dev(dev);
+	int rc;
 
 	/*
 	 * Per the first attach with pasid 1024, set the
@@ -256,6 +269,12 @@ static int mock_domain_set_dev_pasid_nop(struct iommu_domain *domain,
 		}
 	}
 
+	rc = mock_dev_enable_iopf(dev, domain);
+	if (rc)
+		return rc;
+
+	mock_dev_disable_iopf(dev, old);
+
 	return 0;
 }
 
@@ -610,22 +629,42 @@ static void mock_domain_page_response(struct device *dev, struct iopf_fault *evt
 {
 }
 
-static int mock_dev_enable_feat(struct device *dev, enum iommu_dev_features feat)
+static int mock_dev_enable_iopf(struct device *dev, struct iommu_domain *domain)
 {
-	if (feat != IOMMU_DEV_FEAT_IOPF || !mock_iommu_iopf_queue)
+	struct mock_dev *mdev = to_mock_dev(dev);
+	int ret;
+
+	if (!domain || !domain->iopf_handler)
+		return 0;
+
+	if (!mock_iommu_iopf_queue)
 		return -ENODEV;
 
-	return iopf_queue_add_device(mock_iommu_iopf_queue, dev);
+	if (mdev->iopf_refcount) {
+		mdev->iopf_refcount++;
+		return 0;
+	}
+
+	ret = iopf_queue_add_device(mock_iommu_iopf_queue, dev);
+	if (ret)
+		return ret;
+
+	mdev->iopf_refcount = 1;
+
+	return 0;
 }
 
-static int mock_dev_disable_feat(struct device *dev, enum iommu_dev_features feat)
+static void mock_dev_disable_iopf(struct device *dev, struct iommu_domain *domain)
 {
-	if (feat != IOMMU_DEV_FEAT_IOPF || !mock_iommu_iopf_queue)
-		return -ENODEV;
+	struct mock_dev *mdev = to_mock_dev(dev);
+
+	if (!domain || !domain->iopf_handler)
+		return;
+
+	if (--mdev->iopf_refcount)
+		return;
 
 	iopf_queue_remove_device(mock_iommu_iopf_queue, dev);
-
-	return 0;
 }
 
 static void mock_viommu_destroy(struct iommufd_viommu *viommu)
@@ -770,8 +809,6 @@ static const struct iommu_ops mock_ops = {
 	.device_group = generic_device_group,
 	.probe_device = mock_probe_device,
 	.page_response = mock_domain_page_response,
-	.dev_enable_feat = mock_dev_enable_feat,
-	.dev_disable_feat = mock_dev_disable_feat,
 	.user_pasid_table = true,
 	.viommu_alloc = mock_viommu_alloc,
 	.default_domain_ops =
-- 
2.43.0

[PATCH v5 5/8] dmaengine: idxd: Remove unnecessary IOMMU_DEV_FEAT_IOPF

[Lu Baolu]

The IOMMU_DEV_FEAT_IOPF implementation in the iommu driver is just a no-op.
It will also be removed from the iommu driver in the subsequent patch.
Remove it to avoid dead code.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Acked-by: Vinod Koul <vkoul@kernel.org>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Reviewed-by: Fenghua Yu <fenghuay@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Yi Liu <yi.l.liu@intel.com>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
---
 drivers/dma/idxd/init.c | 37 ++++++-------------------------------
 1 file changed, 6 insertions(+), 31 deletions(-)

diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c
index 2d3d580b9987..9e739a4d1ecd 100644
--- a/drivers/dma/idxd/init.c
+++ b/drivers/dma/idxd/init.c
@@ -626,21 +626,6 @@ static void idxd_disable_system_pasid(struct idxd_device *idxd)
 	idxd->pasid = IOMMU_PASID_INVALID;
 }
 
-static int idxd_enable_sva(struct pci_dev *pdev)
-{
-	int ret;
-
-	ret = iommu_dev_enable_feature(&pdev->dev, IOMMU_DEV_FEAT_IOPF);
-	if (ret)
-		return ret;
-	return 0;
-}
-
-static void idxd_disable_sva(struct pci_dev *pdev)
-{
-	iommu_dev_disable_feature(&pdev->dev, IOMMU_DEV_FEAT_IOPF);
-}
-
 static int idxd_probe(struct idxd_device *idxd)
 {
 	struct pci_dev *pdev = idxd->pdev;
@@ -655,17 +640,13 @@ static int idxd_probe(struct idxd_device *idxd)
 	dev_dbg(dev, "IDXD reset complete\n");
 
 	if (IS_ENABLED(CONFIG_INTEL_IDXD_SVM) && sva) {
-		if (idxd_enable_sva(pdev)) {
-			dev_warn(dev, "Unable to turn on user SVA feature.\n");
-		} else {
-			set_bit(IDXD_FLAG_USER_PASID_ENABLED, &idxd->flags);
+		set_bit(IDXD_FLAG_USER_PASID_ENABLED, &idxd->flags);
 
-			rc = idxd_enable_system_pasid(idxd);
-			if (rc)
-				dev_warn(dev, "No in-kernel DMA with PASID. %d\n", rc);
-			else
-				set_bit(IDXD_FLAG_PASID_ENABLED, &idxd->flags);
-		}
+		rc = idxd_enable_system_pasid(idxd);
+		if (rc)
+			dev_warn(dev, "No in-kernel DMA with PASID. %d\n", rc);
+		else
+			set_bit(IDXD_FLAG_PASID_ENABLED, &idxd->flags);
 	} else if (!sva) {
 		dev_warn(dev, "User forced SVA off via module param.\n");
 	}
@@ -703,8 +684,6 @@ static int idxd_probe(struct idxd_device *idxd)
  err:
 	if (device_pasid_enabled(idxd))
 		idxd_disable_system_pasid(idxd);
-	if (device_user_pasid_enabled(idxd))
-		idxd_disable_sva(pdev);
 	return rc;
 }
 
@@ -715,8 +694,6 @@ static void idxd_cleanup(struct idxd_device *idxd)
 	idxd_cleanup_internals(idxd);
 	if (device_pasid_enabled(idxd))
 		idxd_disable_system_pasid(idxd);
-	if (device_user_pasid_enabled(idxd))
-		idxd_disable_sva(idxd->pdev);
 }
 
 /*
@@ -1247,8 +1224,6 @@ static void idxd_remove(struct pci_dev *pdev)
 	free_irq(irq_entry->vector, irq_entry);
 	pci_free_irq_vectors(pdev);
 	pci_iounmap(pdev, idxd->reg_base);
-	if (device_user_pasid_enabled(idxd))
-		idxd_disable_sva(pdev);
 	pci_disable_device(pdev);
 	destroy_workqueue(idxd->wq);
 	perfmon_pmu_remove(idxd);
-- 
2.43.0

[PATCH v5 6/8] uacce: Remove unnecessary IOMMU_DEV_FEAT_IOPF

[Lu Baolu]

None of the drivers implement anything for IOMMU_DEV_FEAT_IOPF anymore,
remove it to avoid dead code.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Acked-by: Zhangfei Gao <zhangfei.gao@linaro.org>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
---
 drivers/misc/uacce/uacce.c | 31 -------------------------------
 1 file changed, 31 deletions(-)

diff --git a/drivers/misc/uacce/uacce.c b/drivers/misc/uacce/uacce.c
index 2a1db2abeeca..42e7d2a2a90c 100644
--- a/drivers/misc/uacce/uacce.c
+++ b/drivers/misc/uacce/uacce.c
@@ -465,31 +465,6 @@ static void uacce_release(struct device *dev)
 	kfree(uacce);
 }
 
-static unsigned int uacce_enable_sva(struct device *parent, unsigned int flags)
-{
-	int ret;
-
-	if (!(flags & UACCE_DEV_SVA))
-		return flags;
-
-	flags &= ~UACCE_DEV_SVA;
-
-	ret = iommu_dev_enable_feature(parent, IOMMU_DEV_FEAT_IOPF);
-	if (ret) {
-		dev_err(parent, "failed to enable IOPF feature! ret = %pe\n", ERR_PTR(ret));
-		return flags;
-	}
-	return flags | UACCE_DEV_SVA;
-}
-
-static void uacce_disable_sva(struct uacce_device *uacce)
-{
-	if (!(uacce->flags & UACCE_DEV_SVA))
-		return;
-
-	iommu_dev_disable_feature(uacce->parent, IOMMU_DEV_FEAT_IOPF);
-}
-
 /**
  * uacce_alloc() - alloc an accelerator
  * @parent: pointer of uacce parent device
@@ -509,8 +484,6 @@ struct uacce_device *uacce_alloc(struct device *parent,
 	if (!uacce)
 		return ERR_PTR(-ENOMEM);
 
-	flags = uacce_enable_sva(parent, flags);
-
 	uacce->parent = parent;
 	uacce->flags = flags;
 	uacce->ops = interface->ops;
@@ -533,7 +506,6 @@ struct uacce_device *uacce_alloc(struct device *parent,
 	return uacce;
 
 err_with_uacce:
-	uacce_disable_sva(uacce);
 	kfree(uacce);
 	return ERR_PTR(ret);
 }
@@ -596,9 +568,6 @@ void uacce_remove(struct uacce_device *uacce)
 		unmap_mapping_range(q->mapping, 0, 0, 1);
 	}
 
-	/* disable sva now since no opened queues */
-	uacce_disable_sva(uacce);
-
 	if (uacce->cdev)
 		cdev_device_del(uacce->cdev, &uacce->dev);
 	xa_erase(&uacce_xa, uacce->dev_id);
-- 
2.43.0

[PATCH v5 7/8] iommufd: Remove unnecessary IOMMU_DEV_FEAT_IOPF

[Lu Baolu]

The iopf enablement has been moved to the iommu drivers. It is unnecessary
for iommufd to handle iopf enablement. Remove the iopf enablement logic to
avoid duplication.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
---
 drivers/iommu/iommufd/device.c          | 59 ++++++++++++-------------
 drivers/iommu/iommufd/eventq.c          | 48 +-------------------
 drivers/iommu/iommufd/iommufd_private.h |  6 ---
 3 files changed, 30 insertions(+), 83 deletions(-)

diff --git a/drivers/iommu/iommufd/device.c b/drivers/iommu/iommufd/device.c
index 2111bad72c72..86244403b532 100644
--- a/drivers/iommu/iommufd/device.c
+++ b/drivers/iommu/iommufd/device.c
@@ -221,7 +221,6 @@ struct iommufd_device *iommufd_device_bind(struct iommufd_ctx *ictx,
 	refcount_inc(&idev->obj.users);
 	/* igroup refcount moves into iommufd_device */
 	idev->igroup = igroup;
-	mutex_init(&idev->iopf_lock);
 
 	/*
 	 * If the caller fails after this success it must call
@@ -425,6 +424,25 @@ static int iommufd_hwpt_pasid_compat(struct iommufd_hw_pagetable *hwpt,
 	return 0;
 }
 
+static bool iommufd_hwpt_compatible_device(struct iommufd_hw_pagetable *hwpt,
+					   struct iommufd_device *idev)
+{
+	struct pci_dev *pdev;
+
+	if (!hwpt->fault || !dev_is_pci(idev->dev))
+		return true;
+
+	/*
+	 * Once we turn on PCI/PRI support for VF, the response failure code
+	 * should not be forwarded to the hardware due to PRI being a shared
+	 * resource between PF and VFs. There is no coordination for this
+	 * shared capability. This waits for a vPRI reset to recover.
+	 */
+	pdev = to_pci_dev(idev->dev);
+
+	return (!pdev->is_virtfn || !pci_pri_supported(pdev));
+}
+
 static int iommufd_hwpt_attach_device(struct iommufd_hw_pagetable *hwpt,
 				      struct iommufd_device *idev,
 				      ioasid_t pasid)
@@ -432,6 +450,9 @@ static int iommufd_hwpt_attach_device(struct iommufd_hw_pagetable *hwpt,
 	struct iommufd_attach_handle *handle;
 	int rc;
 
+	if (!iommufd_hwpt_compatible_device(hwpt, idev))
+		return -EINVAL;
+
 	rc = iommufd_hwpt_pasid_compat(hwpt, idev, pasid);
 	if (rc)
 		return rc;
@@ -440,12 +461,6 @@ static int iommufd_hwpt_attach_device(struct iommufd_hw_pagetable *hwpt,
 	if (!handle)
 		return -ENOMEM;
 
-	if (hwpt->fault) {
-		rc = iommufd_fault_iopf_enable(idev);
-		if (rc)
-			goto out_free_handle;
-	}
-
 	handle->idev = idev;
 	if (pasid == IOMMU_NO_PASID)
 		rc = iommu_attach_group_handle(hwpt->domain, idev->igroup->group,
@@ -454,13 +469,10 @@ static int iommufd_hwpt_attach_device(struct iommufd_hw_pagetable *hwpt,
 		rc = iommu_attach_device_pasid(hwpt->domain, idev->dev, pasid,
 					       &handle->handle);
 	if (rc)
-		goto out_disable_iopf;
+		goto out_free_handle;
 
 	return 0;
 
-out_disable_iopf:
-	if (hwpt->fault)
-		iommufd_fault_iopf_disable(idev);
 out_free_handle:
 	kfree(handle);
 	return rc;
@@ -492,10 +504,7 @@ static void iommufd_hwpt_detach_device(struct iommufd_hw_pagetable *hwpt,
 	else
 		iommu_detach_device_pasid(hwpt->domain, idev->dev, pasid);
 
-	if (hwpt->fault) {
-		iommufd_auto_response_faults(hwpt, handle);
-		iommufd_fault_iopf_disable(idev);
-	}
+	iommufd_auto_response_faults(hwpt, handle);
 	kfree(handle);
 }
 
@@ -507,6 +516,9 @@ static int iommufd_hwpt_replace_device(struct iommufd_device *idev,
 	struct iommufd_attach_handle *handle, *old_handle;
 	int rc;
 
+	if (!iommufd_hwpt_compatible_device(hwpt, idev))
+		return -EINVAL;
+
 	rc = iommufd_hwpt_pasid_compat(hwpt, idev, pasid);
 	if (rc)
 		return rc;
@@ -517,12 +529,6 @@ static int iommufd_hwpt_replace_device(struct iommufd_device *idev,
 	if (!handle)
 		return -ENOMEM;
 
-	if (hwpt->fault && !old->fault) {
-		rc = iommufd_fault_iopf_enable(idev);
-		if (rc)
-			goto out_free_handle;
-	}
-
 	handle->idev = idev;
 	if (pasid == IOMMU_NO_PASID)
 		rc = iommu_replace_group_handle(idev->igroup->group,
@@ -531,20 +537,13 @@ static int iommufd_hwpt_replace_device(struct iommufd_device *idev,
 		rc = iommu_replace_device_pasid(hwpt->domain, idev->dev,
 						pasid, &handle->handle);
 	if (rc)
-		goto out_disable_iopf;
+		goto out_free_handle;
 
-	if (old->fault) {
-		iommufd_auto_response_faults(hwpt, old_handle);
-		if (!hwpt->fault)
-			iommufd_fault_iopf_disable(idev);
-	}
+	iommufd_auto_response_faults(hwpt, old_handle);
 	kfree(old_handle);
 
 	return 0;
 
-out_disable_iopf:
-	if (hwpt->fault && !old->fault)
-		iommufd_fault_iopf_disable(idev);
 out_free_handle:
 	kfree(handle);
 	return rc;
diff --git a/drivers/iommu/iommufd/eventq.c b/drivers/iommu/iommufd/eventq.c
index f39cf0797347..e373b9eec7f5 100644
--- a/drivers/iommu/iommufd/eventq.c
+++ b/drivers/iommu/iommufd/eventq.c
@@ -9,8 +9,6 @@
 #include <linux/iommufd.h>
 #include <linux/module.h>
 #include <linux/mutex.h>
-#include <linux/pci.h>
-#include <linux/pci-ats.h>
 #include <linux/poll.h>
 #include <uapi/linux/iommufd.h>
 
@@ -18,50 +16,6 @@
 #include "iommufd_private.h"
 
 /* IOMMUFD_OBJ_FAULT Functions */
-
-int iommufd_fault_iopf_enable(struct iommufd_device *idev)
-{
-	struct device *dev = idev->dev;
-	int ret;
-
-	/*
-	 * Once we turn on PCI/PRI support for VF, the response failure code
-	 * should not be forwarded to the hardware due to PRI being a shared
-	 * resource between PF and VFs. There is no coordination for this
-	 * shared capability. This waits for a vPRI reset to recover.
-	 */
-	if (dev_is_pci(dev)) {
-		struct pci_dev *pdev = to_pci_dev(dev);
-
-		if (pdev->is_virtfn && pci_pri_supported(pdev))
-			return -EINVAL;
-	}
-
-	mutex_lock(&idev->iopf_lock);
-	/* Device iopf has already been on. */
-	if (++idev->iopf_enabled > 1) {
-		mutex_unlock(&idev->iopf_lock);
-		return 0;
-	}
-
-	ret = iommu_dev_enable_feature(dev, IOMMU_DEV_FEAT_IOPF);
-	if (ret)
-		--idev->iopf_enabled;
-	mutex_unlock(&idev->iopf_lock);
-
-	return ret;
-}
-
-void iommufd_fault_iopf_disable(struct iommufd_device *idev)
-{
-	mutex_lock(&idev->iopf_lock);
-	if (!WARN_ON(idev->iopf_enabled == 0)) {
-		if (--idev->iopf_enabled == 0)
-			iommu_dev_disable_feature(idev->dev, IOMMU_DEV_FEAT_IOPF);
-	}
-	mutex_unlock(&idev->iopf_lock);
-}
-
 void iommufd_auto_response_faults(struct iommufd_hw_pagetable *hwpt,
 				  struct iommufd_attach_handle *handle)
 {
@@ -70,7 +24,7 @@ void iommufd_auto_response_faults(struct iommufd_hw_pagetable *hwpt,
 	struct list_head free_list;
 	unsigned long index;
 
-	if (!fault)
+	if (!fault || !handle)
 		return;
 	INIT_LIST_HEAD(&free_list);
 
diff --git a/drivers/iommu/iommufd/iommufd_private.h b/drivers/iommu/iommufd/iommufd_private.h
index 80e8c76d25f2..9ccc83341f32 100644
--- a/drivers/iommu/iommufd/iommufd_private.h
+++ b/drivers/iommu/iommufd/iommufd_private.h
@@ -425,9 +425,6 @@ struct iommufd_device {
 	/* always the physical device */
 	struct device *dev;
 	bool enforce_cache_coherency;
-	/* protect iopf_enabled counter */
-	struct mutex iopf_lock;
-	unsigned int iopf_enabled;
 };
 
 static inline struct iommufd_device *
@@ -506,9 +503,6 @@ iommufd_get_fault(struct iommufd_ucmd *ucmd, u32 id)
 int iommufd_fault_alloc(struct iommufd_ucmd *ucmd);
 void iommufd_fault_destroy(struct iommufd_object *obj);
 int iommufd_fault_iopf_handler(struct iopf_group *group);
-
-int iommufd_fault_iopf_enable(struct iommufd_device *idev);
-void iommufd_fault_iopf_disable(struct iommufd_device *idev);
 void iommufd_auto_response_faults(struct iommufd_hw_pagetable *hwpt,
 				  struct iommufd_attach_handle *handle);
 
-- 
2.43.0

[PATCH v5 8/8] iommu: Remove iommu_dev_enable/disable_feature()

[Lu Baolu]

No external drivers use these interfaces anymore. Furthermore, no existing
iommu drivers implement anything in the callbacks. Remove them to avoid
dead code.

Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
---
 drivers/iommu/amd/iommu.c                   | 32 -------------------
 drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 34 ---------------------
 drivers/iommu/intel/iommu.c                 | 25 ---------------
 drivers/iommu/iommu.c                       | 32 -------------------
 include/linux/iommu.h                       | 28 -----------------
 5 files changed, 151 deletions(-)

diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index 17aab6d04a13..a9d539fce982 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -2984,36 +2984,6 @@ static const struct iommu_dirty_ops amd_dirty_ops = {
 	.read_and_clear_dirty = amd_iommu_read_and_clear_dirty,
 };
 
-static int amd_iommu_dev_enable_feature(struct device *dev,
-					enum iommu_dev_features feat)
-{
-	int ret = 0;
-
-	switch (feat) {
-	case IOMMU_DEV_FEAT_IOPF:
-		break;
-	default:
-		ret = -EINVAL;
-		break;
-	}
-	return ret;
-}
-
-static int amd_iommu_dev_disable_feature(struct device *dev,
-					 enum iommu_dev_features feat)
-{
-	int ret = 0;
-
-	switch (feat) {
-	case IOMMU_DEV_FEAT_IOPF:
-		break;
-	default:
-		ret = -EINVAL;
-		break;
-	}
-	return ret;
-}
-
 const struct iommu_ops amd_iommu_ops = {
 	.capable = amd_iommu_capable,
 	.blocked_domain = &blocked_domain,
@@ -3027,8 +2997,6 @@ const struct iommu_ops amd_iommu_ops = {
 	.get_resv_regions = amd_iommu_get_resv_regions,
 	.is_attach_deferred = amd_iommu_is_attach_deferred,
 	.def_domain_type = amd_iommu_def_domain_type,
-	.dev_enable_feat = amd_iommu_dev_enable_feature,
-	.dev_disable_feat = amd_iommu_dev_disable_feature,
 	.page_response = amd_iommu_page_response,
 	.default_domain_ops = &(const struct iommu_domain_ops) {
 		.attach_dev	= amd_iommu_attach_device,
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 73f9885d20f1..e91d20e5785e 100644
--- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
+++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
@@ -3654,38 +3654,6 @@ static void arm_smmu_get_resv_regions(struct device *dev,
 	iommu_dma_get_resv_regions(dev, head);
 }
 
-static int arm_smmu_dev_enable_feature(struct device *dev,
-				       enum iommu_dev_features feat)
-{
-	struct arm_smmu_master *master = dev_iommu_priv_get(dev);
-
-	if (!master)
-		return -ENODEV;
-
-	switch (feat) {
-	case IOMMU_DEV_FEAT_IOPF:
-		return 0;
-	default:
-		return -EINVAL;
-	}
-}
-
-static int arm_smmu_dev_disable_feature(struct device *dev,
-					enum iommu_dev_features feat)
-{
-	struct arm_smmu_master *master = dev_iommu_priv_get(dev);
-
-	if (!master)
-		return -EINVAL;
-
-	switch (feat) {
-	case IOMMU_DEV_FEAT_IOPF:
-		return 0;
-	default:
-		return -EINVAL;
-	}
-}
-
 /*
  * HiSilicon PCIe tune and trace device can be used to trace TLP headers on the
  * PCIe link and save the data to memory by DMA. The hardware is restricted to
@@ -3718,8 +3686,6 @@ static struct iommu_ops arm_smmu_ops = {
 	.device_group		= arm_smmu_device_group,
 	.of_xlate		= arm_smmu_of_xlate,
 	.get_resv_regions	= arm_smmu_get_resv_regions,
-	.dev_enable_feat	= arm_smmu_dev_enable_feature,
-	.dev_disable_feat	= arm_smmu_dev_disable_feature,
 	.page_response		= arm_smmu_page_response,
 	.def_domain_type	= arm_smmu_def_domain_type,
 	.viommu_alloc		= arm_vsmmu_alloc,
diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index 9af558390d42..93bc6574d148 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -3963,29 +3963,6 @@ void intel_iommu_disable_iopf(struct device *dev)
 	iopf_queue_remove_device(iommu->iopf_queue, dev);
 }
 
-static int
-intel_iommu_dev_enable_feat(struct device *dev, enum iommu_dev_features feat)
-{
-	switch (feat) {
-	case IOMMU_DEV_FEAT_IOPF:
-		return 0;
-	default:
-		return -ENODEV;
-	}
-}
-
-static int
-intel_iommu_dev_disable_feat(struct device *dev, enum iommu_dev_features feat)
-{
-	switch (feat) {
-	case IOMMU_DEV_FEAT_IOPF:
-		return 0;
-
-	default:
-		return -ENODEV;
-	}
-}
-
 static bool intel_iommu_is_attach_deferred(struct device *dev)
 {
 	struct device_domain_info *info = dev_iommu_priv_get(dev);
@@ -4428,8 +4405,6 @@ const struct iommu_ops intel_iommu_ops = {
 	.release_device		= intel_iommu_release_device,
 	.get_resv_regions	= intel_iommu_get_resv_regions,
 	.device_group		= intel_iommu_device_group,
-	.dev_enable_feat	= intel_iommu_dev_enable_feat,
-	.dev_disable_feat	= intel_iommu_dev_disable_feat,
 	.is_attach_deferred	= intel_iommu_is_attach_deferred,
 	.def_domain_type	= device_def_domain_type,
 	.pgsize_bitmap		= SZ_4K,
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 264383b507bc..df283bddf6cd 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -2910,38 +2910,6 @@ int iommu_fwspec_add_ids(struct device *dev, const u32 *ids, int num_ids)
 }
 EXPORT_SYMBOL_GPL(iommu_fwspec_add_ids);
 
-/*
- * Per device IOMMU features.
- */
-int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat)
-{
-	if (dev_has_iommu(dev)) {
-		const struct iommu_ops *ops = dev_iommu_ops(dev);
-
-		if (ops->dev_enable_feat)
-			return ops->dev_enable_feat(dev, feat);
-	}
-
-	return -ENODEV;
-}
-EXPORT_SYMBOL_GPL(iommu_dev_enable_feature);
-
-/*
- * The device drivers should do the necessary cleanups before calling this.
- */
-int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat)
-{
-	if (dev_has_iommu(dev)) {
-		const struct iommu_ops *ops = dev_iommu_ops(dev);
-
-		if (ops->dev_disable_feat)
-			return ops->dev_disable_feat(dev, feat);
-	}
-
-	return -EBUSY;
-}
-EXPORT_SYMBOL_GPL(iommu_dev_disable_feature);
-
 /**
  * iommu_setup_default_domain - Set the default_domain for the group
  * @group: Group to change
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index bfdd2e71e124..5c05c0851f9f 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -316,16 +316,6 @@ struct iommu_iort_rmr_data {
 	u32 num_sids;
 };
 
-/**
- * enum iommu_dev_features - Per device IOMMU features
- * @IOMMU_DEV_FEAT_IOPF: I/O Page Faults such as PRI or Stall.
- *
- * Device drivers enable a feature using iommu_dev_enable_feature().
- */
-enum iommu_dev_features {
-	IOMMU_DEV_FEAT_IOPF,
-};
-
 #define IOMMU_NO_PASID	(0U) /* Reserved for DMA w/o PASID */
 #define IOMMU_FIRST_GLOBAL_PASID	(1U) /*starting range for allocation */
 #define IOMMU_PASID_INVALID	(-1U)
@@ -657,9 +647,6 @@ struct iommu_ops {
 	bool (*is_attach_deferred)(struct device *dev);
 
 	/* Per device IOMMU features */
-	int (*dev_enable_feat)(struct device *dev, enum iommu_dev_features f);
-	int (*dev_disable_feat)(struct device *dev, enum iommu_dev_features f);
-
 	void (*page_response)(struct device *dev, struct iopf_fault *evt,
 			      struct iommu_page_response *msg);
 
@@ -1128,9 +1115,6 @@ void dev_iommu_priv_set(struct device *dev, void *priv);
 extern struct mutex iommu_probe_device_lock;
 int iommu_probe_device(struct device *dev);
 
-int iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features f);
-int iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features f);
-
 int iommu_device_use_default_domain(struct device *dev);
 void iommu_device_unuse_default_domain(struct device *dev);
 
@@ -1415,18 +1399,6 @@ static inline int iommu_fwspec_add_ids(struct device *dev, u32 *ids,
 	return -ENODEV;
 }
 
-static inline int
-iommu_dev_enable_feature(struct device *dev, enum iommu_dev_features feat)
-{
-	return -ENODEV;
-}
-
-static inline int
-iommu_dev_disable_feature(struct device *dev, enum iommu_dev_features feat)
-{
-	return -ENODEV;
-}
-
 static inline struct iommu_fwspec *dev_iommu_fwspec_get(struct device *dev)
 {
 	return NULL;
-- 
2.43.0

Re: [PATCH v5 8/8] iommu: Remove iommu_dev_enable/disable_feature()

[Nicolin Chen]

On Fri, Apr 18, 2025 at 04:01:30PM +0800, Lu Baolu wrote:
> No external drivers use these interfaces anymore. Furthermore, no existing
> iommu drivers implement anything in the callbacks. Remove them to avoid
> dead code.
> 
> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
> Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
> Reviewed-by: Kevin Tian <kevin.tian@intel.com>
> Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>

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

With the following:

> @@ -657,9 +647,6 @@ struct iommu_ops {
>  	bool (*is_attach_deferred)(struct device *dev);
>  
>  	/* Per device IOMMU features */
> -	int (*dev_enable_feat)(struct device *dev, enum iommu_dev_features f);
> -	int (*dev_disable_feat)(struct device *dev, enum iommu_dev_features f);

They should be dropped in the kdoc too.

Re: [PATCH v5 0/8] iommu: Remove IOMMU_DEV_FEAT_SVA/_IOPF

[Zhangfei Gao]

On Fri, 18 Apr 2025 at 16:01, Lu Baolu <baolu.lu@linux.intel.com> wrote:
>
> The new method for driver fault reporting support relies on the domain
> to specify a iopf_handler. The driver should detect this and setup the
> HW when fault capable domains are attached.
>
> Move SMMUv3 to use this method and have VT-D validate support during
> attach so that all three fault capable drivers have a no-op FEAT_SVA and
> _IOPF. Then remove them.
>
> This was initiated by Jason. I'm following up to remove FEAT_IOPF and
> further clean up.
>
> The whole series is also available at github:
> https://github.com/LuBaolu/intel-iommu/commits/iommu_no_feat-v5
>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>

Thanks Baolu for the re-spin.
Re-tested OK

Thanks

Re: [PATCH v5 0/8] iommu: Remove IOMMU_DEV_FEAT_SVA/_IOPF

[Joerg Roedel]

On Fri, Apr 18, 2025 at 04:01:22PM +0800, Lu Baolu wrote:
> Jason Gunthorpe (2):
>   iommu/arm-smmu-v3: Put iopf enablement in the domain attach path
>   iommu: Remove IOMMU_DEV_FEAT_SVA
> 
> Lu Baolu (6):
>   iommu/vt-d: Put iopf enablement in domain attach path
>   iommufd/selftest: Put iopf enablement in domain attach path
>   dmaengine: idxd: Remove unnecessary IOMMU_DEV_FEAT_IOPF
>   uacce: Remove unnecessary IOMMU_DEV_FEAT_IOPF
>   iommufd: Remove unnecessary IOMMU_DEV_FEAT_IOPF
>   iommu: Remove iommu_dev_enable/disable_feature()

Applied, thanks.

Re: [PATCH v5 2/8] iommu: Remove IOMMU_DEV_FEAT_SVA

[Linus Heckemann]

Lu Baolu <baolu.lu@linux.intel.com> writes:

> From: Jason Gunthorpe <jgg@nvidia.com>
>
> None of the drivers implement anything here anymore, remove the dead code.
>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
> Reviewed-by: Kevin Tian <kevin.tian@intel.com>
> Reviewed-by: Yi Liu <yi.l.liu@intel.com>
> Tested-by: Zhangfei Gao <zhangfei.gao@linaro.org>
> ---
>  drivers/accel/amdxdna/aie2_pci.c            | 13 ++-----------
>  drivers/dma/idxd/init.c                     |  8 +-------
>  drivers/iommu/amd/iommu.c                   |  2 --
>  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c |  2 --
>  drivers/iommu/intel/iommu.c                 |  6 ------
>  drivers/iommu/iommu-sva.c                   |  3 ---
>  drivers/misc/uacce/uacce.c                  |  9 ---------
>  include/linux/iommu.h                       |  9 +--------
>  8 files changed, 4 insertions(+), 48 deletions(-)
>
> diff --git a/drivers/accel/amdxdna/aie2_pci.c b/drivers/accel/amdxdna/aie2_pci.c
> index 5a058e565b01..c6cf7068d23c 100644
> --- a/drivers/accel/amdxdna/aie2_pci.c
> +++ b/drivers/accel/amdxdna/aie2_pci.c
> @@ -512,12 +512,6 @@ static int aie2_init(struct amdxdna_dev *xdna)
>  		goto release_fw;
>  	}
>  
> -	ret = iommu_dev_enable_feature(&pdev->dev, IOMMU_DEV_FEAT_SVA);
> -	if (ret) {
> -		XDNA_ERR(xdna, "Enable PASID failed, ret %d", ret);
> -		goto free_irq;
> -	}
> -
>  	psp_conf.fw_size = fw->size;
>  	psp_conf.fw_buf = fw->data;
>  	for (i = 0; i < PSP_MAX_REGS; i++)
> @@ -526,14 +520,14 @@ static int aie2_init(struct amdxdna_dev *xdna)
>  	if (!ndev->psp_hdl) {
>  		XDNA_ERR(xdna, "failed to create psp");
>  		ret = -ENOMEM;
> -		goto disable_sva;
> +		goto free_irq;
>  	}
>  	xdna->dev_handle = ndev;
>  
>  	ret = aie2_hw_start(xdna);
>  	if (ret) {
>  		XDNA_ERR(xdna, "start npu failed, ret %d", ret);
> -		goto disable_sva;
> +		goto free_irq;
>  	}
>  
>  	ret = aie2_mgmt_fw_query(ndev);
> @@ -584,8 +578,6 @@ static int aie2_init(struct amdxdna_dev *xdna)
>  	aie2_error_async_events_free(ndev);
>  stop_hw:
>  	aie2_hw_stop(xdna);
> -disable_sva:
> -	iommu_dev_disable_feature(&pdev->dev, IOMMU_DEV_FEAT_SVA);
>  free_irq:
>  	pci_free_irq_vectors(pdev);
>  release_fw:
> @@ -601,7 +593,6 @@ static void aie2_fini(struct amdxdna_dev *xdna)
>  
>  	aie2_hw_stop(xdna);
>  	aie2_error_async_events_free(ndev);
> -	iommu_dev_disable_feature(&pdev->dev, IOMMU_DEV_FEAT_SVA);
>  	pci_free_irq_vectors(pdev);
>  }
>  
> diff --git a/drivers/dma/idxd/init.c b/drivers/dma/idxd/init.c
> index fca1d2924999..2d3d580b9987 100644
> --- a/drivers/dma/idxd/init.c
> +++ b/drivers/dma/idxd/init.c
> @@ -633,17 +633,11 @@ static int idxd_enable_sva(struct pci_dev *pdev)
>  	ret = iommu_dev_enable_feature(&pdev->dev, IOMMU_DEV_FEAT_IOPF);
>  	if (ret)
>  		return ret;
> -
> -	ret = iommu_dev_enable_feature(&pdev->dev, IOMMU_DEV_FEAT_SVA);
> -	if (ret)
> -		iommu_dev_disable_feature(&pdev->dev, IOMMU_DEV_FEAT_IOPF);
> -
> -	return ret;
> +	return 0;
>  }
>  
>  static void idxd_disable_sva(struct pci_dev *pdev)
>  {
> -	iommu_dev_disable_feature(&pdev->dev, IOMMU_DEV_FEAT_SVA);
>  	iommu_dev_disable_feature(&pdev->dev, IOMMU_DEV_FEAT_IOPF);
>  }
>  
> diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
> index dea0fed7abb0..17aab6d04a13 100644
> --- a/drivers/iommu/amd/iommu.c
> +++ b/drivers/iommu/amd/iommu.c
> @@ -2991,7 +2991,6 @@ static int amd_iommu_dev_enable_feature(struct device *dev,
>  
>  	switch (feat) {
>  	case IOMMU_DEV_FEAT_IOPF:
> -	case IOMMU_DEV_FEAT_SVA:
>  		break;
>  	default:
>  		ret = -EINVAL;
> @@ -3007,7 +3006,6 @@ static int amd_iommu_dev_disable_feature(struct device *dev,
>  
>  	switch (feat) {
>  	case IOMMU_DEV_FEAT_IOPF:
> -	case IOMMU_DEV_FEAT_SVA:
>  		break;
>  	default:
>  		ret = -EINVAL;
> 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 6cb875f98905..73f9885d20f1 100644
> --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> @@ -3664,7 +3664,6 @@ static int arm_smmu_dev_enable_feature(struct device *dev,
>  
>  	switch (feat) {
>  	case IOMMU_DEV_FEAT_IOPF:
> -	case IOMMU_DEV_FEAT_SVA:
>  		return 0;
>  	default:
>  		return -EINVAL;
> @@ -3681,7 +3680,6 @@ static int arm_smmu_dev_disable_feature(struct device *dev,
>  
>  	switch (feat) {
>  	case IOMMU_DEV_FEAT_IOPF:
> -	case IOMMU_DEV_FEAT_SVA:
>  		return 0;
>  	default:
>  		return -EINVAL;
> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
> index 857c431d8ec5..4c3be92804e2 100644
> --- a/drivers/iommu/intel/iommu.c
> +++ b/drivers/iommu/intel/iommu.c
> @@ -3956,9 +3956,6 @@ intel_iommu_dev_enable_feat(struct device *dev, enum iommu_dev_features feat)
>  	case IOMMU_DEV_FEAT_IOPF:
>  		return intel_iommu_enable_iopf(dev);
>  
> -	case IOMMU_DEV_FEAT_SVA:
> -		return 0;
> -
>  	default:
>  		return -ENODEV;
>  	}
> @@ -3972,9 +3969,6 @@ intel_iommu_dev_disable_feat(struct device *dev, enum iommu_dev_features feat)
>  		intel_iommu_disable_iopf(dev);
>  		return 0;
>  
> -	case IOMMU_DEV_FEAT_SVA:
> -		return 0;
> -
>  	default:
>  		return -ENODEV;
>  	}
> diff --git a/drivers/iommu/iommu-sva.c b/drivers/iommu/iommu-sva.c
> index ab18bc494eef..944daa0dabd6 100644
> --- a/drivers/iommu/iommu-sva.c
> +++ b/drivers/iommu/iommu-sva.c
> @@ -63,9 +63,6 @@ static struct iommu_mm_data *iommu_alloc_mm_data(struct mm_struct *mm, struct de
>   * reference is taken. Caller must call iommu_sva_unbind_device()
>   * to release each reference.
>   *
> - * iommu_dev_enable_feature(dev, IOMMU_DEV_FEAT_SVA) must be called first, to
> - * initialize the required SVA features.
> - *
>   * On error, returns an ERR_PTR value.
>   */
>  struct iommu_sva *iommu_sva_bind_device(struct device *dev, struct mm_struct *mm)
> diff --git a/drivers/misc/uacce/uacce.c b/drivers/misc/uacce/uacce.c
> index bdc2e6fda782..2a1db2abeeca 100644
> --- a/drivers/misc/uacce/uacce.c
> +++ b/drivers/misc/uacce/uacce.c
> @@ -479,14 +479,6 @@ static unsigned int uacce_enable_sva(struct device *parent, unsigned int flags)
>  		dev_err(parent, "failed to enable IOPF feature! ret = %pe\n", ERR_PTR(ret));
>  		return flags;
>  	}
> -
> -	ret = iommu_dev_enable_feature(parent, IOMMU_DEV_FEAT_SVA);
> -	if (ret) {
> -		dev_err(parent, "failed to enable SVA feature! ret = %pe\n", ERR_PTR(ret));
> -		iommu_dev_disable_feature(parent, IOMMU_DEV_FEAT_IOPF);
> -		return flags;
> -	}
> -
>  	return flags | UACCE_DEV_SVA;
>  }
>  
> @@ -495,7 +487,6 @@ static void uacce_disable_sva(struct uacce_device *uacce)
>  	if (!(uacce->flags & UACCE_DEV_SVA))
>  		return;
>  
> -	iommu_dev_disable_feature(uacce->parent, IOMMU_DEV_FEAT_SVA);
>  	iommu_dev_disable_feature(uacce->parent, IOMMU_DEV_FEAT_IOPF);
>  }
>  
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index 7e8c2af89799..bfdd2e71e124 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -318,18 +318,11 @@ struct iommu_iort_rmr_data {
>  
>  /**
>   * enum iommu_dev_features - Per device IOMMU features
> - * @IOMMU_DEV_FEAT_SVA: Shared Virtual Addresses
> - * @IOMMU_DEV_FEAT_IOPF: I/O Page Faults such as PRI or Stall. Generally
> - *			 enabling %IOMMU_DEV_FEAT_SVA requires
> - *			 %IOMMU_DEV_FEAT_IOPF, but some devices manage I/O Page
> - *			 Faults themselves instead of relying on the IOMMU. When
> - *			 supported, this feature must be enabled before and
> - *			 disabled after %IOMMU_DEV_FEAT_SVA.
> + * @IOMMU_DEV_FEAT_IOPF: I/O Page Faults such as PRI or Stall.
>   *
>   * Device drivers enable a feature using iommu_dev_enable_feature().
>   */
>  enum iommu_dev_features {
> -	IOMMU_DEV_FEAT_SVA,
>  	IOMMU_DEV_FEAT_IOPF,
>  };
>  
> -- 
> 2.43.0

Hi all,

It appears the code removed here was not in fact entirely dead; my 2024
gpd win mini ("G1617-01", with a Ryzen 8840U) fails to suspend
correctly, and I bisected the issue to this commit.

dmesg:

[  141.397168] wlp1s0: deauthenticating from 20:05:b6:ff:c4:5e by local choice (Reason: 3=DEAUTH_LEAVING)
[  141.716327] PM: suspend entry (s2idle)
[  141.783603] Filesystems sync: 0.067 seconds
[  141.895439] Freezing user space processes
[  141.896512] Freezing user space processes completed (elapsed 0.001 seconds)
[  141.896515] OOM killer disabled.
[  141.896516] Freezing remaining freezable tasks
[  141.897523] Freezing remaining freezable tasks completed (elapsed 0.001 seconds)
[  141.897527] printk: Suspending console(s) (use no_console_suspend to debug)
[  142.292185] ACPI: EC: interrupt blocked
[  149.879420] amd_pmc AMDI0009:00: Last suspend didn't reach deepest state
note ^
[  150.026394] ACPI: EC: interrupt unblocked
[  150.196340] [drm] PCIE GART of 512M enabled (table at 0x00000081FFD00000).
[  150.196503] amdgpu 0000:c3:00.0: amdgpu: SMU is resuming...
[  150.200585] amdgpu 0000:c3:00.0: amdgpu: SMU is resumed successfully!
[  150.228549] nvme nvme0: 16/0/0 default/read/poll queues
[  150.244609] nvme nvme0: Failed to get ANA log: 16649
[  150.319610] amdgpu 0000:c3:00.0: amdgpu: ring gfx_0.0.0 uses VM inv eng 0 on hub 0
[  150.319619] amdgpu 0000:c3:00.0: amdgpu: ring comp_1.0.0 uses VM inv eng 1 on hub 0
[  150.319621] amdgpu 0000:c3:00.0: amdgpu: ring comp_1.1.0 uses VM inv eng 4 on hub 0
[  150.319623] amdgpu 0000:c3:00.0: amdgpu: ring comp_1.2.0 uses VM inv eng 6 on hub 0
[  150.319624] amdgpu 0000:c3:00.0: amdgpu: ring comp_1.3.0 uses VM inv eng 7 on hub 0
[  150.319625] amdgpu 0000:c3:00.0: amdgpu: ring comp_1.0.1 uses VM inv eng 8 on hub 0
[  150.319627] amdgpu 0000:c3:00.0: amdgpu: ring comp_1.1.1 uses VM inv eng 9 on hub 0
[  150.319628] amdgpu 0000:c3:00.0: amdgpu: ring comp_1.2.1 uses VM inv eng 10 on hub 0
[  150.319629] amdgpu 0000:c3:00.0: amdgpu: ring comp_1.3.1 uses VM inv eng 11 on hub 0
[  150.319630] amdgpu 0000:c3:00.0: amdgpu: ring sdma0 uses VM inv eng 12 on hub 0
[  150.319632] amdgpu 0000:c3:00.0: amdgpu: ring vcn_unified_0 uses VM inv eng 0 on hub 8
[  150.319633] amdgpu 0000:c3:00.0: amdgpu: ring jpeg_dec uses VM inv eng 1 on hub 8
[  150.319635] amdgpu 0000:c3:00.0: amdgpu: ring mes_kiq_3.1.0 uses VM inv eng 13 on hub 0
[  150.329858] [drm] ring gfx_32773.1.1 was added
[  150.330624] [drm] ring compute_32773.2.2 was added
[  150.331491] [drm] ring sdma_32773.3.3 was added
[  150.331565] [drm] ring gfx_32773.1.1 ib test pass
[  150.331603] [drm] ring compute_32773.2.2 ib test pass
[  150.331699] [drm] ring sdma_32773.3.3 ib test pass
[  150.498226] usb 1-3: reset full-speed USB device number 2 using xhci_hcd
[  150.738138] usb 1-5: reset full-speed USB device number 4 using xhci_hcd
[  150.906575] OOM killer enabled.
[  150.906578] Restarting tasks ... 
[  150.906640] input: Microsoft X-Box 360 pad as /devices/pci0000:00/0000:00:08.1/0000:c3:00.3/usb1/1-5/1-5:1.0/input/input27
[  150.907291] done.
[  150.907372] random: crng reseeded on system resumption
[  150.931675] PM: suspend exit


Let me know if there's any further information that would be helpful here.


Linus

Re: [PATCH v5 2/8] iommu: Remove IOMMU_DEV_FEAT_SVA

[Jason Gunthorpe]

On Thu, Dec 25, 2025 at 10:05:59PM +0100, Linus Heckemann wrote:
> It appears the code removed here was not in fact entirely dead; my 2024
> gpd win mini ("G1617-01", with a Ryzen 8840U) fails to suspend
> correctly, and I bisected the issue to this commit.

The only behavior change this patch had that could be relavent to a
Ryzen was in drivers/accel/amdxdna/aie2_pci.c - are you using this
driver?

Prior to this patch amdxdna would have failed to load in configs
without an iommu as iommu_dev_enable_feature() would have
failed. After this patch it will load successfully.

If so then that driver presmuably doesn't have working power
management in your system.

Jason

amdxdna breaks suspend (was: Re: [PATCH v5 2/8] iommu: Remove IOMMU_DEV_FEAT_SVA)

[Linus Heckemann]

Jason Gunthorpe <jgg@nvidia.com> writes:

> On Thu, Dec 25, 2025 at 10:05:59PM +0100, Linus Heckemann wrote:
>> It appears the code removed here was not in fact entirely dead; my 2024
>> gpd win mini ("G1617-01", with a Ryzen 8840U) fails to suspend
>> correctly, and I bisected the issue to this commit.
>
> The only behavior change this patch had that could be relavent to a
> Ryzen was in drivers/accel/amdxdna/aie2_pci.c - are you using this
> driver?
>
> Prior to this patch amdxdna would have failed to load in configs
> without an iommu as iommu_dev_enable_feature() would have
> failed. After this patch it will load successfully.
>
> If so then that driver presmuably doesn't have working power
> management in your system.

You're right, blacklisting the amdxdna driver fixes suspend, thanks for
the pointer!

@Min Ma, Lizhi Hou, dri-devel: do you have any insight into why this
might be happening?

Cheers

Linus H

Re: amdxdna breaks suspend (was: Re: [PATCH v5 2/8] iommu: Remove IOMMU_DEV_FEAT_SVA)

[Alex Deucher]

On Fri, Jan 16, 2026 at 10:12 AM Linus Heckemann <linus@schreibt.jetzt> wrote:
>
> Jason Gunthorpe <jgg@nvidia.com> writes:
>
> > On Thu, Dec 25, 2025 at 10:05:59PM +0100, Linus Heckemann wrote:
> >> It appears the code removed here was not in fact entirely dead; my 2024
> >> gpd win mini ("G1617-01", with a Ryzen 8840U) fails to suspend
> >> correctly, and I bisected the issue to this commit.
> >
> > The only behavior change this patch had that could be relavent to a
> > Ryzen was in drivers/accel/amdxdna/aie2_pci.c - are you using this
> > driver?
> >
> > Prior to this patch amdxdna would have failed to load in configs
> > without an iommu as iommu_dev_enable_feature() would have
> > failed. After this patch it will load successfully.
> >
> > If so then that driver presmuably doesn't have working power
> > management in your system.
>
> You're right, blacklisting the amdxdna driver fixes suspend, thanks for
> the pointer!
>
> @Min Ma, Lizhi Hou, dri-devel: do you have any insight into why this
> might be happening?

The xdna driver requires SVA and the IOMMU.

Alex

Re: amdxdna breaks suspend (was: Re: [PATCH v5 2/8] iommu: Remove IOMMU_DEV_FEAT_SVA)

[Jason Gunthorpe]

On Fri, Jan 16, 2026 at 10:27:56AM -0500, Alex Deucher wrote:
> On Fri, Jan 16, 2026 at 10:12 AM Linus Heckemann <linus@schreibt.jetzt> wrote:
> >
> > Jason Gunthorpe <jgg@nvidia.com> writes:
> >
> > > On Thu, Dec 25, 2025 at 10:05:59PM +0100, Linus Heckemann wrote:
> > >> It appears the code removed here was not in fact entirely dead; my 2024
> > >> gpd win mini ("G1617-01", with a Ryzen 8840U) fails to suspend
> > >> correctly, and I bisected the issue to this commit.
> > >
> > > The only behavior change this patch had that could be relavent to a
> > > Ryzen was in drivers/accel/amdxdna/aie2_pci.c - are you using this
> > > driver?
> > >
> > > Prior to this patch amdxdna would have failed to load in configs
> > > without an iommu as iommu_dev_enable_feature() would have
> > > failed. After this patch it will load successfully.
> > >
> > > If so then that driver presmuably doesn't have working power
> > > management in your system.
> >
> > You're right, blacklisting the amdxdna driver fixes suspend, thanks for
> > the pointer!
> >
> > @Min Ma, Lizhi Hou, dri-devel: do you have any insight into why this
> > might be happening?
> 
> The xdna driver requires SVA and the IOMMU.

It should probably call device_iommu_mapped() during probe then

Jason

Re: amdxdna breaks suspend (was: Re: [PATCH v5 2/8] iommu: Remove IOMMU_DEV_FEAT_SVA)

[Lizhi Hou]

On 1/16/26 08:02, Jason Gunthorpe wrote:
> On Fri, Jan 16, 2026 at 10:27:56AM -0500, Alex Deucher wrote:
>> On Fri, Jan 16, 2026 at 10:12 AM Linus Heckemann <linus@schreibt.jetzt> wrote:
>>> Jason Gunthorpe <jgg@nvidia.com> writes:
>>>
>>>> On Thu, Dec 25, 2025 at 10:05:59PM +0100, Linus Heckemann wrote:
>>>>> It appears the code removed here was not in fact entirely dead; my 2024
>>>>> gpd win mini ("G1617-01", with a Ryzen 8840U) fails to suspend
>>>>> correctly, and I bisected the issue to this commit.
>>>> The only behavior change this patch had that could be relavent to a
>>>> Ryzen was in drivers/accel/amdxdna/aie2_pci.c - are you using this
>>>> driver?
>>>>
>>>> Prior to this patch amdxdna would have failed to load in configs
>>>> without an iommu as iommu_dev_enable_feature() would have
>>>> failed. After this patch it will load successfully.

I am wondering if the amdxdna loads firmware successfully or the loading 
actually failed?

When running under a hypervisor, we have observed that amdxdna firmware 
loading failures can cause issues. And a quick fix was recently 
upstreamed. Please see:

https://github.com/torvalds/linux/commit/7bbf6d15e935abbb3d604c1fa157350e84a26f98

Are you running under a hypervisor, like xen dom0?


Thanks,

Lizhi

>>>>
>>>> If so then that driver presmuably doesn't have working power
>>>> management in your system.
>>> You're right, blacklisting the amdxdna driver fixes suspend, thanks for
>>> the pointer!
>>>
>>> @Min Ma, Lizhi Hou, dri-devel: do you have any insight into why this
>>> might be happening?
>> The xdna driver requires SVA and the IOMMU.
> It should probably call device_iommu_mapped() during probe then
>
> Jason