iommu/amd: Add support for page response

This generates AMD IOMMU COMPLETE_PPR_REQUEST for the specified device
with the specified PRI Response Code.

Also update amd_iommu_complete_ppr() to accept 'struct device' instead
of pdev as it just need device reference.

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Wei Huang <wei.huang2@amd.com>
Co-developed-by: Vasant Hegde <vasant.hegde@amd.com>
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20240418103400.6229-11-vasant.hegde@amd.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

Author: ssuthiku-amd

drivers/iommu/amd/amd_iommu.h

@@ -49,6 +49,8 @@ bool amd_iommu_pasid_supported(void);
 /* IOPF */
 int amd_iommu_iopf_init(struct amd_iommu *iommu);
 void amd_iommu_iopf_uninit(struct amd_iommu *iommu);
+void amd_iommu_page_response(struct device *dev, struct iopf_fault *evt,
+			     struct iommu_page_response *resp);
 
 /* GCR3 setup */
 int amd_iommu_set_gcr3(struct iommu_dev_data *dev_data,
@@ -60,8 +62,7 @@ int __init amd_iommu_alloc_ppr_log(struct amd_iommu *iommu);
 void __init amd_iommu_free_ppr_log(struct amd_iommu *iommu);
 void amd_iommu_enable_ppr_log(struct amd_iommu *iommu);
 void amd_iommu_poll_ppr_log(struct amd_iommu *iommu);
-int amd_iommu_complete_ppr(struct pci_dev *pdev, u32 pasid,
-			   int status, int tag);
+int amd_iommu_complete_ppr(struct device *dev, u32 pasid, int status, int tag);
 
 /*
  * This function flushes all internal caches of

drivers/iommu/amd/iommu.c

@@ -1628,15 +1628,14 @@ void amd_iommu_domain_update(struct protection_domain *domain)
 	amd_iommu_domain_flush_all(domain);
 }
 
-int amd_iommu_complete_ppr(struct pci_dev *pdev, u32 pasid,
-			   int status, int tag)
+int amd_iommu_complete_ppr(struct device *dev, u32 pasid, int status, int tag)
 {
 	struct iommu_dev_data *dev_data;
 	struct amd_iommu *iommu;
 	struct iommu_cmd cmd;
 
-	dev_data = dev_iommu_priv_get(&pdev->dev);
-	iommu    = get_amd_iommu_from_dev(&pdev->dev);
+	dev_data = dev_iommu_priv_get(dev);
+	iommu    = get_amd_iommu_from_dev(dev);
 
 	build_complete_ppr(&cmd, dev_data->devid, pasid, status,
 			   tag, dev_data->pri_tlp);
@@ -2852,6 +2851,7 @@ const struct iommu_ops amd_iommu_ops = {
 	.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,
 		.map_pages	= amd_iommu_map_pages,

drivers/iommu/amd/ppr.c

@@ -139,3 +139,9 @@ void amd_iommu_iopf_uninit(struct amd_iommu *iommu)
 	iopf_queue_free(iommu->iopf_queue);
 	iommu->iopf_queue = NULL;
 }
+
+void amd_iommu_page_response(struct device *dev, struct iopf_fault *evt,
+			     struct iommu_page_response *resp)
+{
+	amd_iommu_complete_ppr(dev, resp->pasid, resp->code, resp->grpid);
+}