[PATCH v4 07/14] iommu/amd: Add support for page response

[Vasant Hegde <vasant.hegde@amd.com>]

From: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>

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

Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@amd.com>
Signed-off-by: Wei Huang <wei.huang2@amd.com>
Signed-off-by: Vasant Hegde <vasant.hegde@amd.com>
---
 drivers/iommu/amd/amd_iommu.h |  3 +++
 drivers/iommu/amd/iommu.c     |  1 +
 drivers/iommu/amd/ppr.c       | 15 +++++++++++++++
 3 files changed, 19 insertions(+)

diff --git a/drivers/iommu/amd/amd_iommu.h b/drivers/iommu/amd/amd_iommu.h
index cfbb4a332f6e..065f6b8ec183 100644
--- a/drivers/iommu/amd/amd_iommu.h
+++ b/drivers/iommu/amd/amd_iommu.h
@@ -49,6 +49,9 @@ 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);
+int amd_iommu_page_response(struct device *dev,
+			    struct iopf_fault *evt,
+			    struct iommu_page_response *resp);
 
 struct amd_iommu *get_amd_iommu(unsigned int idx);
 u8 amd_iommu_pc_get_max_banks(unsigned int idx);
diff --git a/drivers/iommu/amd/iommu.c b/drivers/iommu/amd/iommu.c
index e4dae14c7d00..2913b7e701cb 100644
--- a/drivers/iommu/amd/iommu.c
+++ b/drivers/iommu/amd/iommu.c
@@ -2817,6 +2817,7 @@ 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,
diff --git a/drivers/iommu/amd/ppr.c b/drivers/iommu/amd/ppr.c
index 1eb0b737afb5..b1751eb495fd 100644
--- a/drivers/iommu/amd/ppr.c
+++ b/drivers/iommu/amd/ppr.c
@@ -148,3 +148,18 @@ void amd_iommu_iopf_uninit(struct amd_iommu *iommu)
 
 	raw_spin_unlock_irqrestore(&iommu->lock, flags);
 }
+
+int amd_iommu_page_response(struct device *dev,
+			    struct iopf_fault *evt,
+			    struct iommu_page_response *resp)
+{
+	struct pci_dev *pdev;
+
+	if (!dev || !dev_is_pci(dev))
+		return -ENODEV;
+
+	pdev = to_pci_dev(dev);
+
+	return amd_iommu_complete_ppr(pdev, resp->pasid, resp->code,
+				      resp->grpid);
+}
-- 
2.31.1