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Subject[PATCH v7 0/7] Fix PF/VF dependency issue
From: Kuppuswamy Sathyanarayanan <>

Current implementation of ATS, PASID, PRI does not handle VF dependencies
correctly. Following patches addresses this issue.

Changes since v6:
* Removed locking interfaces used in v6.
* Made necessary changes to PRI/PASID enable/disable calls to allow
register changes only for PF.

Changes since v5:
* Created new patches for PRI/PASID capability caching.
* Removed individual locks (pri_lock, pasid_lock) and added common
resource lock to synchronize PRI/PASID updates between PF/VF.
* Addressed comments from Bjorn Helgaas.

Changes since v4:
* Defined empty functions for pci_pri_init() and pci_pasid_init() for cases
where CONFIG_PCI_PRI and CONFIG_PCI_PASID are not enabled.

Changes since v3:
* Fixed critical path (lock context) in pci_restore_*_state functions.

Changes since v2:
* Added locking mechanism to synchronize accessing PF registers in VF.
* Removed spec compliance checks in patches.
* Addressed comments from Bjorn Helgaas.

Changes since v1:
* Added more details about the patches in commit log.
* Removed bulk spec check patch.
* Addressed comments from Bjorn Helgaas.

Kuppuswamy Sathyanarayanan (7):
PCI/ATS: Fix pci_prg_resp_pasid_required() dependency issues
PCI/ATS: Cache PRI capability check result
PCI/ATS: Cache PASID capability check result
PCI/ATS: Add PRI support for PCIe VF devices
PCI/ATS: Add PASID support for PCIe VF devices
PCI/ATS: Disable PF/VF ATS service independently
PCI: Skip Enhanced Allocation (EA) initialization for VF device

drivers/pci/ats.c | 202 ++++++++++++++++++++++++++++------------
drivers/pci/pci.c | 7 ++
include/linux/pci-ats.h | 12 ++-
include/linux/pci.h | 3 +-
4 files changed, 159 insertions(+), 65 deletions(-)


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