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FAILED: patch "[PATCH] PCI/ATS: Add pci_pri_supported() to check device or" failed to apply to 4.19-stable tree

PATCH [email protected] 1 participant 1 message Aug 19, 2020

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Stable branch PCI IOMMU Intel IOMMU (VT-d)
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The patch below does not apply to the 4.19-stable tree.
If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to <[email protected]>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

From 3f9a7a13fe4cb6e119e4e4745fbf975d30bfac9b Mon Sep 17 00:00:00 2001
From: Ashok Raj <[email protected]>
Date: Thu, 23 Jul 2020 15:37:29 -0700
Subject: [PATCH] PCI/ATS: Add pci_pri_supported() to check device or
associated PF

For SR-IOV, the PF PRI is shared between the PF and any associated VFs, and the PRI Capability is allowed for PFs but not for VFs. Searching for the PRI Capability on a VF always fails, even if its associated PF supports PRI.

Add pci_pri_supported() to check whether device or its associated PF supports PRI.

[bhelgaas: commit log, avoid "!!"]
Fixes b16d0cb9e2fc ("iommu/vt-d: Always enable PASID/PRI PCI capabilities before ATS")
Link https://lore.kernel.org/r/[email protected] open here
Signed-off-by Ashok Raj <[email protected]>
Signed-off-by Bjorn Helgaas <[email protected]>
Reviewed-by Lu Baolu <[email protected]>
Acked-by Joerg Roedel <[email protected]>
Cc [email protected] # v4.4+
drivers/iommu/intel/iommu.c +1 -1
index 9129663a7406..5552e7d5d2b1 100644
@@ -2554,7 +2554,7 @@ static struct dmar_domain *dmar_insert_one_dev_info(struct intel_iommu *iommu,
 			}
 
 			if (info->ats_supported && ecap_prs(iommu->ecap) &&
-			    pci_find_ext_capability(pdev, PCI_EXT_CAP_ID_PRI))
+			    pci_pri_supported(pdev))
 				info->pri_supported = 1;
 		}
 	}
drivers/pci/ats.c +15 -0
index b761c1f72f67..647e097530a8 100644
@@ -325,6 +325,21 @@ int pci_prg_resp_pasid_required(struct pci_dev *pdev)
 
 	return pdev->pasid_required;
 }
+
+/**
+ * pci_pri_supported - Check if PRI is supported.
+ * @pdev: PCI device structure
+ *
+ * Returns true if PRI capability is present, false otherwise.
+ */
+bool pci_pri_supported(struct pci_dev *pdev)
+{
+	/* VFs share the PF PRI */
+	if (pci_physfn(pdev)->pri_cap)
+		return true;
+	return false;
+}
+EXPORT_SYMBOL_GPL(pci_pri_supported);
 #endif /* CONFIG_PCI_PRI */
 
 #ifdef CONFIG_PCI_PASID
include/linux/pci-ats.h +4 -0
index f75c307f346d..df54cd5b15db 100644
@@ -28,6 +28,10 @@ int pci_enable_pri(struct pci_dev *pdev, u32 reqs);
 void pci_disable_pri(struct pci_dev *pdev);
 int pci_reset_pri(struct pci_dev *pdev);
 int pci_prg_resp_pasid_required(struct pci_dev *pdev);
+bool pci_pri_supported(struct pci_dev *pdev);
+#else
+static inline bool pci_pri_supported(struct pci_dev *pdev)
+{ return false; }
 #endif /* CONFIG_PCI_PRI */
 
 #ifdef CONFIG_PCI_PASID