[PATCH 5/6] drm/xe/pci: add helper for ATS/PASID without PRI

[Nareshkumar Gollakoti <naresh.kumar.g@intel.com>]

On platforms where ATS and PASID are enabled but PRI is not available,
SVA faults cannot rely on the IOMMU to fault in missing CPU mirror
bindings. Those faults must instead be recovered in driver.

Add a small PCI helper to report this condition so fault-handling code
can use a single predicate for the PRI-less SVA case.

Signed-off-by: Nareshkumar Gollakoti <naresh.kumar.g@intel.com>
---
 drivers/gpu/drm/xe/xe_pci.h | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_pci.h b/drivers/gpu/drm/xe/xe_pci.h
index 5f784229a5ec..cd22d316883b 100644
--- a/drivers/gpu/drm/xe/xe_pci.h
+++ b/drivers/gpu/drm/xe/xe_pci.h
@@ -18,4 +18,13 @@ static inline bool xe_pci_ats_pasid_enabled(struct pci_dev *pdev)
 	return pdev->ats_enabled && pdev->pasid_enabled;
 }
 
+/*
+ * True when SVA faults must be serviced in software: ATS/PASID is
+ * enabled but PRI is not available, so the IOMMU has no self-healing path.
+ */
+static inline bool xe_pci_svm_needs_sw_iopf(struct pci_dev *pdev)
+{
+	return xe_pci_ats_pasid_enabled(pdev) && !pdev->pri_enabled;
+}
+
 #endif
-- 
2.43.0