All of lore.kernel.org
 help / color / mirror / Atom feed
* [PATCH] PCI/ATS: PASID and PRI are only enumerated in PF devices.
@ 2020-07-20 16:43 ` Ashok Raj
  0 siblings, 0 replies; 18+ messages in thread
From: Ashok Raj @ 2020-07-20 16:43 UTC (permalink / raw)
  To: linux-pci, Bjorn Helgaas, Joerg Roedel, Lu Baolu
  Cc: Ashok Raj, stable, linux-kernel, iommu

PASID and PRI capabilities are only enumerated in PF devices. VF devices
do not enumerate these capabilites. IOMMU drivers also need to enumerate
them before enabling features in the IOMMU. Extending the same support as
PASID feature discovery (pci_pasid_features) for PRI.

Signed-off-by: Ashok Raj <ashok.raj@intel.com>

To: Bjorn Helgaas <bhelgaas@google.com>
To: Joerg Roedel <joro@8bytes.com>
To: Lu Baolu <baolu.lu@intel.com>
Cc: stable@vger.kernel.org
Cc: linux-pci@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: iommu@lists.linux-foundation.org
---
 drivers/iommu/intel/iommu.c |  2 +-
 drivers/pci/ats.c           | 14 ++++++++++++++
 include/linux/pci-ats.h     |  1 +
 3 files changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index d759e7234e98..276452f5e6a7 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -2560,7 +2560,7 @@ 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;
 		}
 	}
diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c
index b761c1f72f67..ffb4de8c5a77 100644
--- a/drivers/pci/ats.c
+++ b/drivers/pci/ats.c
@@ -461,6 +461,20 @@ int pci_pasid_features(struct pci_dev *pdev)
 }
 EXPORT_SYMBOL_GPL(pci_pasid_features);
 
+/**
+ * pci_pri_supported - Check if PRI is supported.
+ * @pdev: PCI device structure
+ *
+ * Returns false when no PRI capability is present.
+ * Returns true if PRI feature is supported and enabled
+ */
+bool pci_pri_supported(struct pci_dev *pdev)
+{
+	/* VFs share the PF PRI configuration */
+	return !!(pci_physfn(pdev)->pri_cap);
+}
+EXPORT_SYMBOL_GPL(pci_pri_supported);
+
 #define PASID_NUMBER_SHIFT	8
 #define PASID_NUMBER_MASK	(0x1f << PASID_NUMBER_SHIFT)
 /**
diff --git a/include/linux/pci-ats.h b/include/linux/pci-ats.h
index f75c307f346d..073d57292445 100644
--- a/include/linux/pci-ats.h
+++ b/include/linux/pci-ats.h
@@ -28,6 +28,7 @@ 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);
 #endif /* CONFIG_PCI_PRI */
 
 #ifdef CONFIG_PCI_PASID
-- 
2.7.4


^ permalink raw reply related	[flat|nested] 18+ messages in thread
* [PATCH] PCI/ATS: PASID and PRI are only enumerated in PF devices.
@ 2020-07-21 19:44 ` Ashok Raj
  0 siblings, 0 replies; 18+ messages in thread
From: Ashok Raj @ 2020-07-21 19:44 UTC (permalink / raw)
  To: linux-pci, Bjorn Helgaas, Joerg Roedel
  Cc: Ashok Raj, stable, linux-kernel, iommu

PASID and PRI capabilities are only enumerated in PF devices. VF devices
do not enumerate these capabilites. IOMMU drivers also need to enumerate
them before enabling features in the IOMMU. Extending the same support as
PASID feature discovery (pci_pasid_features) for PRI.

Signed-off-by: Ashok Raj <ashok.raj@intel.com>

v2: Fixed build failure from lkp when CONFIG_PRI=n
    Almost all the PRI functions were called only when CONFIG_PASID is
    set. Except the new pci_pri_supported().

To: Bjorn Helgaas <bhelgaas@google.com>
To: Joerg Roedel <joro@8bytes.com>
To: Lu Baolu <baolu.lu@intel.com>
Cc: stable@vger.kernel.org
Cc: linux-pci@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: iommu@lists.linux-foundation.org
---
 drivers/iommu/intel/iommu.c |  2 +-
 drivers/pci/ats.c           | 14 ++++++++++++++
 include/linux/pci-ats.h     |  4 ++++
 3 files changed, 19 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index d759e7234e98..276452f5e6a7 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -2560,7 +2560,7 @@ 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;
 		}
 	}
diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c
index b761c1f72f67..ffb4de8c5a77 100644
--- a/drivers/pci/ats.c
+++ b/drivers/pci/ats.c
@@ -461,6 +461,20 @@ int pci_pasid_features(struct pci_dev *pdev)
 }
 EXPORT_SYMBOL_GPL(pci_pasid_features);
 
+/**
+ * pci_pri_supported - Check if PRI is supported.
+ * @pdev: PCI device structure
+ *
+ * Returns false when no PRI capability is present.
+ * Returns true if PRI feature is supported and enabled
+ */
+bool pci_pri_supported(struct pci_dev *pdev)
+{
+	/* VFs share the PF PRI configuration */
+	return !!(pci_physfn(pdev)->pri_cap);
+}
+EXPORT_SYMBOL_GPL(pci_pri_supported);
+
 #define PASID_NUMBER_SHIFT	8
 #define PASID_NUMBER_MASK	(0x1f << PASID_NUMBER_SHIFT)
 /**
diff --git a/include/linux/pci-ats.h b/include/linux/pci-ats.h
index f75c307f346d..fc989295daf3 100644
--- a/include/linux/pci-ats.h
+++ b/include/linux/pci-ats.h
@@ -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
+bool pci_pri_supported(struct pci_dev *pdev)
+{ return false; }
 #endif /* CONFIG_PCI_PRI */
 
 #ifdef CONFIG_PCI_PASID
-- 
2.7.4


^ permalink raw reply related	[flat|nested] 18+ messages in thread
* [PATCH] PCI/ATS: PASID and PRI are only enumerated in PF devices.
@ 2020-07-21 21:13 ` Ashok Raj
  0 siblings, 0 replies; 18+ messages in thread
From: Ashok Raj @ 2020-07-21 21:13 UTC (permalink / raw)
  To: linux-pci, Bjorn Helgaas, Joerg Roedel
  Cc: Ashok Raj, stable, linux-kernel, iommu

PASID and PRI capabilities are only enumerated in PF devices. VF devices
do not enumerate these capabilites. IOMMU drivers also need to enumerate
them before enabling features in the IOMMU. Extending the same support as
PASID feature discovery (pci_pasid_features) for PRI.

Signed-off-by: Ashok Raj <ashok.raj@intel.com>

v2: Fixed build failure from lkp when CONFIG_PRI=n
    Almost all the PRI functions were called only when CONFIG_PASID is
    set. Except the new pci_pri_supported().

    previous version sent in error because i missed dry-run before recompile
    :-(

To: Bjorn Helgaas <bhelgaas@google.com>
To: Joerg Roedel <joro@8bytes.com>
To: Lu Baolu <baolu.lu@intel.com>
Cc: stable@vger.kernel.org
Cc: linux-pci@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: Ashok Raj <ashok.raj@intel.com>
Cc: iommu@lists.linux-foundation.org
---
 drivers/iommu/intel/iommu.c |  2 +-
 drivers/pci/ats.c           | 13 +++++++++++++
 include/linux/pci-ats.h     |  4 ++++
 3 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c
index d759e7234e98..276452f5e6a7 100644
--- a/drivers/iommu/intel/iommu.c
+++ b/drivers/iommu/intel/iommu.c
@@ -2560,7 +2560,7 @@ 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;
 		}
 	}
diff --git a/drivers/pci/ats.c b/drivers/pci/ats.c
index b761c1f72f67..2e6cf0c700f7 100644
--- a/drivers/pci/ats.c
+++ b/drivers/pci/ats.c
@@ -325,6 +325,19 @@ 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 configuration */
+	return !!(pci_physfn(pdev)->pri_cap);
+}
+EXPORT_SYMBOL_GPL(pci_pri_supported);
 #endif /* CONFIG_PCI_PRI */
 
 #ifdef CONFIG_PCI_PASID
diff --git a/include/linux/pci-ats.h b/include/linux/pci-ats.h
index f75c307f346d..df54cd5b15db 100644
--- a/include/linux/pci-ats.h
+++ b/include/linux/pci-ats.h
@@ -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
-- 
2.7.4


^ permalink raw reply related	[flat|nested] 18+ messages in thread
end of thread, other threads:[~2020-07-23 19:30 UTC | newest]

Thread overview: 18+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-07-20 16:43 [PATCH] PCI/ATS: PASID and PRI are only enumerated in PF devices Ashok Raj
2020-07-20 16:43 ` Ashok Raj
2020-07-20 20:43 ` kernel test robot
2020-07-20 20:43   ` kernel test robot
2020-07-20 20:43   ` kernel test robot
2020-07-21  4:53 ` kernel test robot
2020-07-21  4:53   ` kernel test robot
2020-07-21  4:53   ` kernel test robot
2020-07-21 14:54 ` Bjorn Helgaas
2020-07-21 14:54   ` Bjorn Helgaas
2020-07-23 17:38   ` Raj, Ashok
2020-07-23 17:38     ` Raj, Ashok
2020-07-23 19:30     ` Bjorn Helgaas
2020-07-23 19:30       ` Bjorn Helgaas
2020-07-21 19:44 Ashok Raj
2020-07-21 19:44 ` Ashok Raj
2020-07-21 21:13 Ashok Raj
2020-07-21 21:13 ` Ashok Raj

This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.