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path: root/drivers/pci/ats.c
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2017-05-30PCI: Restore PRI and PASID state after Function-Level ResetCQ Tang
After a Function-Level Reset, PCI states need to be restored. Save PASID features and PRI reqs cached. [bhelgaas: search for capability only if PRI/PASID were enabled] Signed-off-by: CQ Tang <cq.tang@intel.com> Signed-off-by: Ashok Raj <ashok.raj@intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Cc: Joerg Roedel <joro@8bytes.org> Cc: Jean-Phillipe Brucker <jean-philippe.brucker@arm.com> Cc: David Woodhouse <dwmw2@infradead.org>
2017-05-30PCI: Cache PRI and PASID bits in pci_devJean-Philippe Brucker
Device drivers need to check if an IOMMU enabled ATS, PRI and PASID in order to know when they can use the SVM API. Cache PRI and PASID bits in the pci_dev structure, similarly to what is currently done for ATS. Signed-off-by: Jean-Philippe Brucker <jean-philippe.brucker@arm.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
2015-08-13PCI: Remove pci_ats_enabled()Bjorn Helgaas
Remove pci_ats_enabled(). There are no callers outside the ATS code itself. We don't need to check ats_cap, because if we don't find an ATS capability, we'll never set ats_enabled. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Joerg Roedel <jroedel@suse.de>
2015-08-13PCI: Stop caching ATS Invalidate Queue DepthBjorn Helgaas
Stop caching the Invalidate Queue Depth in struct pci_dev. pci_ats_queue_depth() is typically called only once per device, and it returns a fixed value per-device, so callers who need the value frequently can cache it themselves. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Joerg Roedel <jroedel@suse.de>
2015-08-13PCI: Clean up ATS error handlingBjorn Helgaas
There's no need to BUG() if we enable ATS when it's already enabled. We don't need to BUG() when disabling ATS on a device that doesn't support ATS or if it's already disabled. If ATS is enabled, certainly we found an ATS capability in the past, so it should still be there now. Clean up these error paths. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Joerg Roedel <jroedel@suse.de>
2015-08-13PCI: Use pci_physfn() rather than looking up physfn by handBjorn Helgaas
Use the pci_physfn() helper rather than looking up physfn by hand. No functional change. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Joerg Roedel <jroedel@suse.de>
2015-08-13PCI: Inline the ATS setup code into pci_ats_init()Bjorn Helgaas
The ATS setup code in ats_alloc_one() is only used by pci_ats_init(), so inline it there. No functional change. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Joerg Roedel <jroedel@suse.de>
2015-08-13PCI: Rationalize pci_ats_queue_depth() error checkingBjorn Helgaas
We previously returned -ENODEV for devices that don't support ATS (except that we always returned 0 for VFs, whether or not they support ATS). For consistency, always return -EINVAL (not -ENODEV) if the device doesn't support ATS. Return zero for VFs that support ATS. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Joerg Roedel <jroedel@suse.de>
2015-08-13PCI: Embed ATS info directly into struct pci_devBjorn Helgaas
The pci_ats struct is small and will get smaller, so I don't think it's worth allocating it separately from the pci_dev struct. Embed the ATS fields directly into struct pci_dev. Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Joerg Roedel <jroedel@suse.de>
2015-08-13PCI: Allocate ATS struct during enumerationBjorn Helgaas
Previously, we allocated pci_ats structures when an IOMMU driver called pci_enable_ats(). An SR-IOV VF shares the STU setting with its PF, so when enabling ATS on the VF, we allocated a pci_ats struct for the PF if it didn't already have one. We held the sriov->lock to serialize threads concurrently enabling ATS on several VFS so only one would allocate the PF pci_ats. Gregor reported a deadlock here: pci_enable_sriov sriov_enable virtfn_add mutex_lock(dev->sriov->lock) # acquire sriov->lock pci_device_add device_add BUS_NOTIFY_ADD_DEVICE notifier chain iommu_bus_notifier amd_iommu_add_device # iommu_ops.add_device init_iommu_group iommu_group_get_for_dev iommu_group_add_device __iommu_attach_device amd_iommu_attach_device # iommu_ops.attach_device attach_device pci_enable_ats mutex_lock(dev->sriov->lock) # deadlock There's no reason to delay allocating the pci_ats struct, and if we allocate it for each device at enumeration-time, there's no need for locking in pci_enable_ats(). Allocate pci_ats struct during enumeration, when we initialize other capabilities. Note that this implementation requires ATS to be enabled on the PF first, before on any of the VFs because the PF controls the STU for all the VFs. Link: http://permalink.gmane.org/gmane.linux.kernel.iommu/9433 Reported-by: Gregor Dick <gdick@solarflare.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Joerg Roedel <jroedel@suse.de>
2014-01-10PCI: Removed unused parts of Page Request Interface supportStephen Hemminger
My philosophy is unused code is dead code. And dead code is subject to bit rot and is a likely source of bugs. Use it or lose it. This reverts parts of c320b976d783 ("PCI: Add implementation for PRI capability"), removing these interfaces: pci_pri_enabled() pci_pri_stopped() pci_pri_status() [bhelgaas: split to separate patch] Signed-off-by: Stephen Hemminger <stephen@networkplumber.org> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> CC: Joerg Roedel <joro@8bytes.org>
2013-11-14PCI: Fix whitespace, capitalization, and spelling errorsBjorn Helgaas
Fix whitespace, capitalization, and spelling errors. No functional change. I know "busses" is not an error, but "buses" was more common, so I used it consistently. Signed-off-by: Marta Rybczynska <rybczynska@gmail.com> (pci_reset_bridge_secondary_bus()) Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Acked-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2012-01-11Merge branch 'linux-next' of ↵Linus Torvalds
git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci * 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci: (80 commits) x86/PCI: Expand the x86_msi_ops to have a restore MSIs. PCI: Increase resource array mask bit size in pcim_iomap_regions() PCI: DEVICE_COUNT_RESOURCE should be equal to PCI_NUM_RESOURCES PCI: pci_ids: add device ids for STA2X11 device (aka ConneXT) PNP: work around Dell 1536/1546 BIOS MMCONFIG bug that breaks USB x86/PCI: amd: factor out MMCONFIG discovery PCI: Enable ATS at the device state restore PCI: msi: fix imbalanced refcount of msi irq sysfs objects PCI: kconfig: English typo in pci/pcie/Kconfig PCI/PM/Runtime: make PCI traces quieter PCI: remove pci_create_bus() xtensa/PCI: convert to pci_scan_root_bus() for correct root bus resources x86/PCI: convert to pci_create_root_bus() and pci_scan_root_bus() x86/PCI: use pci_scan_bus() instead of pci_scan_bus_parented() x86/PCI: read Broadcom CNB20LE host bridge info before PCI scan sparc32, leon/PCI: convert to pci_scan_root_bus() for correct root bus resources sparc/PCI: convert to pci_create_root_bus() sh/PCI: convert to pci_scan_root_bus() for correct root bus resources powerpc/PCI: convert to pci_create_root_bus() powerpc/PCI: split PHB part out of pcibios_map_io_space() ... Fix up conflicts in drivers/pci/msi.c and include/linux/pci_regs.h due to the same patches being applied in other branches.
2012-01-09Merge branches 'iommu/fixes', 'arm/omap' and 'x86/amd' into nextJoerg Roedel
Conflicts: drivers/pci/hotplug/acpiphp_glue.c
2012-01-06PCI: Enable ATS at the device state restoreHao, Xudong
During S3 or S4 resume or PCI reset, ATS regs aren't restored correctly. This patch enables ATS at the device state restore if PCI device has ATS capability. Signed-off-by: Xudong Hao <xudong.hao@intel.com> Signed-off-by: Xiantao Zhang <xiantao.zhang@intel.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2012-01-06PCI: Fix PRI and PASID consistencyAlex Williamson
These are extended capabilities, rename and move to proper group for consistency. Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2011-12-05PCI: fix ats compile failureJames Bottomley
I get this compile failure on parisc: drivers/pci/ats.c: In function 'ats_alloc_one': drivers/pci/ats.c:29: error: implicit declaration of function 'kzalloc' drivers/pci/ats.c:29: warning: assignment makes pointer from integer without a cast drivers/pci/ats.c: In function 'ats_free_one': drivers/pci/ats.c:45: error: implicit declaration of function 'kfree' Because ats.c is missing linux/slab.h as an include. This patch fixes it Signed-off-by: James Bottomley <JBottomley@Parallels.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2011-12-05PCI: More PRI/PASID cleanupAlex Williamson
More consistency cleanups. Drop the _OFF, separate and indent CTRL/CAP/STATUS bit definitions. This helped find the previous mis-use of bit 0 in the PASID capability register. Reviewed-by: Joerg Roedel <joerg.roedel@amd.com> Tested-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2011-12-05PCI: Enable is not exposed as a PASID capabilityAlex Williamson
The PASID ECN indicates bit 0 is reserved in the capability register. Switch pci_enable_pasid() to error if PASID is already enabled and don't expose enable as a feature in pci_pasid_features(). Reviewed-by: Joerg Roedel <joerg.roedel@amd.com> Tested-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2011-12-05PCI: Fix PRI and PASID consistencyAlex Williamson
These are extended capabilities, rename and move to proper group for consistency. Signed-off-by: Alex Williamson <alex.williamson@redhat.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2011-10-31pci: Fix files needing export.h for EXPORT_SYMBOL/THIS_MODULEPaul Gortmaker
They were implicitly getting it from device.h --> module.h but we want to clean that up. So add the minimal header for these macros. Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
2011-10-14PCI: Add support for PASID capabilityJoerg Roedel
Devices supporting Process Address Space Identifiers (PASIDs) can use an IOMMU to access multiple IO address spaces at the same time. A PCIe device indicates support for this feature by implementing the PASID capability. This patch adds support for the capability to the Linux kernel. Reviewed-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2011-10-14PCI: Add implementation for PRI capabilityJoerg Roedel
Implement the necessary functions to handle PRI capabilities on PCIe devices. With PRI devices behind an IOMMU can signal page fault conditions to software and recover from such faults. Reviewed-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2011-10-14PCI: Export ATS functions to modulesJoerg Roedel
This patch makes the ATS functions usable for modules. They will be used by a module implementing some advanced AMD IOMMU features. Reviewed-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
2011-10-14PCI: Move ATS implementation into own fileJoerg Roedel
ATS does not depend on IOV support, so move the code into its own file. This file will also include support for the PRI and PASID capabilities later. Also give ATS its own Kconfig variable to allow selecting it without IOV support. Reviewed-by: Bjorn Helgaas <bhelgaas@google.com> Signed-off-by: Joerg Roedel <joerg.roedel@amd.com> Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
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