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SubjectRe: [PATCH v8 0/5] Fix PF/VF dependency issue
On Thu, Sep 05, 2019 at 02:31:41PM -0500, Bjorn Helgaas wrote:
> From: Bjorn Helgaas <bhelgaas@google.com>
>
> The current implementation of ATS, PASID, and PRI does not handle VF
> dependencies correctly. These are essentially Kuppuswamy's patches; I
> reordered and tweaked them slightly.
>
> Please treat this as a proposal, not a done deal, and post a v9 with any
> changes needed.
>
> Changes since v7:
> * Moved PRI & PASID capability offset caching to last since they're just
> optimizations
> * Cached offsets at first use instead of adding _init() functions
> * Dropped complicated pci_prg_resp_pasid_required() #ifdefs by just
> searching for the capability again
> * Dropped EA/VF validation since it only enforces spec language without
> fixing any known issues
>
> 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.
>
>
> Link: https://lore.kernel.org/r/cover.1567029860.git.sathyanarayanan.kuppuswamy@linux.intel.com v7
>
> Kuppuswamy Sathyanarayanan (5):
> PCI/ATS: Handle sharing of PF PRI Capability with all VFs
> PCI/ATS: Handle sharing of PF PASID Capability with all VFs
> PCI/ATS: Disable PF/VF ATS service independently
> PCI/ATS: Cache PRI Capability offset
> PCI/ATS: Cache PASID Capability offset
>
> drivers/pci/ats.c | 153 +++++++++++++++++++++++++++-----------------
> include/linux/pci.h | 3 +-
> 2 files changed, 96 insertions(+), 60 deletions(-)

Applied to pci/virtualization for v5.5.

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