[PATCH v4] acpi/iort: numa: Add numa node mapping for smmuv3 devices

[lorenzo.pieralisi@arm.com (Lorenzo Pieralisi)]

On Tue, Jul 25, 2017 at 05:13:05PM +0200, Robert Richter wrote:
> On 25.07.17 10:32:37, Ganapatrao Kulkarni wrote:
> > ARM IORT specification(rev. C) has added  provision to define proximity
> > domain in SMMUv3 IORT table. Adding required code to parse Proximity
> > domain and set numa_node of smmv3 platform devices.
> > 
> > Add code to parse proximity domain in SMMUv3 IORT table to
> > set numa node mapping for smmuv3 devices.
> > 
> > Signed-off-by: Ganapatrao Kulkarni <ganapatrao.kulkarni@cavium.com>
> > ---
> > 
> > This patch has dependency on header file patch [1], which is
> > already merged to linux-pm.
> > 
> > [1] https://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm.git/commit/?h=linux-next&id=c944230064eb65e4fa018d86779b4fd200b1d7e7
> > 
> > v4:
> >   - Fix compilation issue in !CONFIG_NUMA
> > 
> > v3:
> >   - Addressed Lorenzo Pieralisi comment.
> > 
> > v2:
> >   - Changed as per Lorenzo Pieralisi and Hanjun Guo suggestions.
> > 
> > v1:
> >   - Initial patch
> > 
> >  drivers/acpi/arm64/iort.c | 33 +++++++++++++++++++++++++++++++--
> >  1 file changed, 31 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
> > index a3215ee..c5c82c3 100644
> > --- a/drivers/acpi/arm64/iort.c
> > +++ b/drivers/acpi/arm64/iort.c
> > @@ -908,6 +908,28 @@ static bool __init arm_smmu_v3_is_coherent(struct acpi_iort_node *node)
> >  	return smmu->flags & ACPI_IORT_SMMU_V3_COHACC_OVERRIDE;
> >  }
> >  
> > +#if defined(CONFIG_ACPI_NUMA) && (ACPI_CA_VERSION >= 0x20170629)
> 
> This acpica version check was very unhandy for backports when we did
> this last time. If we backport just c944230064 and this single patch
> it wont work as the version check prevents the code from being
> enabled. Isn't there another way to handle cross tree dependencies of
> pull requests? E.g. we could base this patch on acpica (ab539eaa50)
> and remove the check.
> 
> Alternatively we could do in this case:
> 
> #if defined(CONFIG_ACPI_NUMA) && defined(ACPI_IORT_SMMU_V3_PXM_VALID)
> 
> > +/*
> > + * set numa proximity domain for smmuv3 device
> > + */
> > +static void  __init arm_smmu_v3_set_proximity(struct acpi_iort_node *node,
> > +		struct device *dev)
> > +{
> > +	struct acpi_iort_smmu_v3 *smmu;
> > +
> > +	smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
> > +	if (smmu->flags & ACPI_IORT_SMMU_V3_PXM_VALID) {
> > +		set_dev_node(dev, acpi_map_pxm_to_node(smmu->pxm));
> > +		pr_info("SMMUV3[%llx] Mapped to Proximity domain %d\n",
> 
> Better use dev_info() here.
> 
> > +			smmu->base_address,
> > +			smmu->pxm);
> > +	}
> > +}
> > +#else
> > +static void  __init arm_smmu_v3_set_proximity(struct acpi_iort_node *node,
> > +		struct device *dev) { }
> 
> Just do:
> 
> #define arm_smmu_v3_set_proximity NULL
> 
> > +#endif
> > +
> >  static int __init arm_smmu_count_resources(struct acpi_iort_node *node)
> >  {
> >  	struct acpi_iort_smmu *smmu;
> > @@ -977,20 +999,24 @@ struct iort_iommu_config {
> >  	int (*iommu_count_resources)(struct acpi_iort_node *node);
> >  	void (*iommu_init_resources)(struct resource *res,
> >  				     struct acpi_iort_node *node);
> > +	void (*iommu_set_proximity)(struct acpi_iort_node *node,
> > +				     struct device *dev);
> 
> Wrt pseudo-OO programming this is more a method for struct dev than
> node, so swap args: iommu_set_proximity(dev, node)
> 
> >  };
> >  
> >  static const struct iort_iommu_config iort_arm_smmu_v3_cfg __initconst = {
> >  	.name = "arm-smmu-v3",
> >  	.iommu_is_coherent = arm_smmu_v3_is_coherent,
> >  	.iommu_count_resources = arm_smmu_v3_count_resources,
> > -	.iommu_init_resources = arm_smmu_v3_init_resources
> > +	.iommu_init_resources = arm_smmu_v3_init_resources,
> > +	.iommu_set_proximity = arm_smmu_v3_set_proximity
> 
> Add comma at the end here.
> 
> >  };
> >  
> >  static const struct iort_iommu_config iort_arm_smmu_cfg __initconst = {
> >  	.name = "arm-smmu",
> >  	.iommu_is_coherent = arm_smmu_is_coherent,
> >  	.iommu_count_resources = arm_smmu_count_resources,
> > -	.iommu_init_resources = arm_smmu_init_resources
> > +	.iommu_init_resources = arm_smmu_init_resources,
> > +	.iommu_set_proximity = NULL
> 
> No need for null assignment.

Patch that I will send upstream below, please check, thanks.

-- >8 --
Subject: [PATCH] ACPI/IORT: numa: Add numa node mapping for smmuv3 devices

ARM IORT specification(rev. C) has added  provision to define proximity
domain in SMMUv3 IORT table. Adding required code to parse Proximity
domain and set numa_node of smmv3 platform devices.

Add code to parse proximity domain in SMMUv3 IORT table to
set numa node mapping for smmuv3 devices.

Link: http://lkml.kernel.org/r/20170706112017.GA16981 at rric.localdomain
Signed-off-by: Ganapatrao Kulkarni <ganapatrao.kulkarni@cavium.com>
[lorenzo.pieralisi at arm.com: updated review comments]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
---
 drivers/acpi/arm64/iort.c | 29 ++++++++++++++++++++++++++++-
 1 file changed, 28 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/arm64/iort.c b/drivers/acpi/arm64/iort.c
index a3215ee..35dd803 100644
--- a/drivers/acpi/arm64/iort.c
+++ b/drivers/acpi/arm64/iort.c
@@ -908,6 +908,27 @@ static bool __init arm_smmu_v3_is_coherent(struct acpi_iort_node *node)
 	return smmu->flags & ACPI_IORT_SMMU_V3_COHACC_OVERRIDE;
 }
 
+#if defined(CONFIG_ACPI_NUMA) && defined(ACPI_IORT_SMMU_v3_PXM_VALID)
+/*
+ * set numa proximity domain for smmuv3 device
+ */
+static void  __init arm_smmu_v3_set_proximity(struct device *dev,
+					      struct acpi_iort_node *node)
+{
+	struct acpi_iort_smmu_v3 *smmu;
+
+	smmu = (struct acpi_iort_smmu_v3 *)node->node_data;
+	if (smmu->flags & ACPI_IORT_SMMU_V3_PXM_VALID) {
+		set_dev_node(dev, acpi_map_pxm_to_node(smmu->pxm));
+		dev_info(dev, "SMMUV3[%llx] Mapped to Proximity domain %d\n",
+			smmu->base_address,
+			smmu->pxm);
+	}
+}
+#else
+#define arm_smmu_v3_set_proximity NULL
+#endif
+
 static int __init arm_smmu_count_resources(struct acpi_iort_node *node)
 {
 	struct acpi_iort_smmu *smmu;
@@ -977,13 +998,16 @@ struct iort_iommu_config {
 	int (*iommu_count_resources)(struct acpi_iort_node *node);
 	void (*iommu_init_resources)(struct resource *res,
 				     struct acpi_iort_node *node);
+	void (*iommu_set_proximity)(struct device *dev,
+				    struct acpi_iort_node *node);
 };
 
 static const struct iort_iommu_config iort_arm_smmu_v3_cfg __initconst = {
 	.name = "arm-smmu-v3",
 	.iommu_is_coherent = arm_smmu_v3_is_coherent,
 	.iommu_count_resources = arm_smmu_v3_count_resources,
-	.iommu_init_resources = arm_smmu_v3_init_resources
+	.iommu_init_resources = arm_smmu_v3_init_resources,
+	.iommu_set_proximity = arm_smmu_v3_set_proximity,
 };
 
 static const struct iort_iommu_config iort_arm_smmu_cfg __initconst = {
@@ -1028,6 +1052,9 @@ static int __init iort_add_smmu_platform_device(struct acpi_iort_node *node)
 	if (!pdev)
 		return -ENOMEM;
 
+	if (ops->iommu_set_proximity)
+		ops->iommu_set_proximity(&pdev->dev, node);
+
 	count = ops->iommu_count_resources(node);
 
 	r = kcalloc(count, sizeof(*r), GFP_KERNEL);
-- 
2.10.0