kernel/linux.git/drivers/pci/controller/vmd.c, branch v4.19.112

PCI: vmd: Detach resources after stopping root bus

2019-12-01T08:16:37+00:00

[ Upstream commit dc8af3a827df6d4bb925d3b81b7ec94a7cce9482 ] The VMD removal path calls pci_stop_root_busi(), which tears down the pcie tree, including detaching all of the attached drivers. During driver detachment, devices may use pci_release_region() to release resources. This path relies on the resource being accessible in resource tree. By detaching the child domain from the parent resource domain prior to stopping the bus, we are preventing the list traversal from finding the resource to be freed. If we instead detach the resource after stopping the bus, we will have properly freed the resource and detaching is simply accounting at that point. Without this order, the resource is never freed and is orphaned on VMD removal, leading to a warning: [ 181.940162] Trying to free nonexistent resource Fixes: 2c2c5c5cd213 ("x86/PCI: VMD: Attach VMD resources to parent domain's resource tree") Signed-off-by: Jon Derrick [lorenzo.pieralisi@arm.com: updated commit log] Signed-off-by: Lorenzo Pieralisi Reviewed-by: Keith Busch Signed-off-by: Sasha Levin

PCI: vmd: Fix config addressing when using bus offsets

2019-10-17T20:45:44+00:00

commit e3dffa4f6c3612dea337c9c59191bd418afc941b upstream. VMD maps child device config spaces to the VMD Config BAR linearly regardless of the starting bus offset. Because of this, the config address decode must ignore starting bus offsets when mapping the BDF to the config space address. Fixes: 2a5a9c9a20f9 ("PCI: vmd: Add offset to bus numbers if necessary") Signed-off-by: Jon Derrick Signed-off-by: Lorenzo Pieralisi Cc: stable@vger.kernel.org # v5.2+ Signed-off-by: Sushma Kalakota Signed-off-by: Greg Kroah-Hartman

PCI: vmd: Fix shadow offsets to reflect spec changes

2019-10-11T16:20:59+00:00

commit a1a30170138c9c5157bd514ccd4d76b47060f29b upstream. The shadow offset scratchpad was moved to 0x2000-0x2010. Update the location to get the correct shadow offset. Fixes: 6788958e4f3c ("PCI: vmd: Assign membar addresses from shadow registers") Signed-off-by: Jon Derrick Signed-off-by: Lorenzo Pieralisi Cc: stable@vger.kernel.org # v5.2+ Signed-off-by: Greg Kroah-Hartman

PCI: vmd: White list for fast interrupt handlers

2018-06-28T16:25:33+00:00

Devices with slow interrupt handlers are significantly harming performance when their interrupt vector is shared with a fast device. Create a class code white list for devices with known fast interrupt handlers and let all other devices share a single vector so that they don't interfere with performance. At the moment, only the NVM Express class code is on the list, but more may be added if VMD users desire to use other low-latency devices in these domains. Signed-off-by: Keith Busch [lorenzo.pieralisi@arm.com: changelog] Signed-off-by: Lorenzo Pieralisi Acked-by: Jon Derrick:

PCI: Collect all native drivers under drivers/pci/controller/

2018-06-08T12:50:11+00:00

Native PCI drivers for root complex devices were originally all in drivers/pci/host/. Some of these devices can also be operated in endpoint mode. Drivers for endpoint mode didn't seem to fit in the "host" directory, so we put both the root complex and endpoint drivers in per-device directories, e.g., drivers/pci/dwc/, drivers/pci/cadence/, etc. These per-device directories contain trivial Kconfig and Makefiles and clutter drivers/pci/. Make a new drivers/pci/controllers/ directory and collect all the device-specific drivers there. No functional change intended. Link: https://lkml.kernel.org/r/1520304202-232891-1-git-send-email-shawn.lin@rock-chips.com Signed-off-by: Shawn Lin [bhelgaas: changelog] Signed-off-by: Bjorn Helgaas