On Thu, Sep 05, 2019 at 02:31:41PM -0500, Bjorn Helgaas wrote: > From: Bjorn Helgaas <bhelgaas@xxxxxxxxxx> > > 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@xxxxxxxxxxxxxxx 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.
