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linux/drivers/pci/controller
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Jim Quinlan 5fb8f2628e PCI: brcmstb: Prevent config space access when link is down 
When the link is down, config accesses to downstream devices cause CPU
aborts.  Allow config accesses only when the link is up.

As the following scenario shows, this check is racy and cannot completely
avoid CPU aborts, but it makes them less likely:

  pci_generic_config_read
    addr = brcm_pcie_map_conf            # bus->ops->map_bus()
      brcm_pcie_link_up                  # returns "true"; link is up
    <link goes down>
    *val = readb(addr)                   # link is now down
    <CPU abort>

Note that config space accesses to the Root Port are not affected by link
status.

[bhelgaas: commit log, use PCIE_ECAM_REG() instead of magic 0xfff masks;
note that pci_generic_config_read32() masks low two bits already]
Link: https://lore.kernel.org/r/20220725151258.42574-4-jim2101024@gmail.com
Signed-off-by: Jim Quinlan <jim2101024@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Florian Fainelli <f.fainelli@gmail.com>
2022-07-27 11:52:54 -05:00
..
cadence PCI: cadence: Clear FLR in device capabilities register 2022-05-12 22:19:40 +01:00
dwc pci-v5.19-changes 2022-05-27 15:25:10 -07:00
mobiveil PCI: Add defines for normal and subtractive PCI bridges 2022-02-17 15:29:35 -06:00
Kconfig PCI: mvebu: Add help string for CONFIG_PCI_MVEBU option 2022-02-03 10:52:22 +00:00
Makefile Merge branch 'pci/host/mt7621' 2021-11-05 11:28:51 -05:00
pci-aardvark.c Revert "PCI: aardvark: Rewrite IRQ code to chained IRQ handler" 2022-05-16 15:58:47 -05:00
pci-ftpci100.c PCI: Bulk conversion to generic_handle_domain_irq() 2021-08-02 11:53:05 -05:00
pci-host-common.c PCI/MSI: Make pci_host_common_probe() declare its reliance on MSI domains 2021-04-20 14:11:22 +01:00
pci-host-generic.c PCI: Unify ECAM constants in native PCI Express drivers 2020-12-10 14:55:49 -06:00
pci-hyperv-intf.c PCI: hv: Add a Hyper-V PCI interface driver for software backchannel interface 2019-08-22 00:25:12 -07:00
pci-hyperv.c PCI: hv: Fix synchronization between channel callback and hv_pci_bus_exit() 2022-05-13 16:57:32 +00:00
pci-ixp4xx.c ARM: ixp4xx: fix building both pci drivers 2021-08-12 23:10:09 +02:00
pci-loongson.c PCI: Add defines for normal and subtractive PCI bridges 2022-02-17 15:29:35 -06:00
pci-mvebu.c PCI: mvebu: Add support for sending Set_Slot_Power_Limit message 2022-04-25 10:53:39 +01:00
pci-rcar-gen2.c PCI: rcar-gen2: Rename rcar_pci_priv to rcar_pci 2022-01-03 15:05:28 -06:00
pci-tegra.c PCI: Add defines for normal and subtractive PCI bridges 2022-02-17 15:29:35 -06:00
pci-thunder-ecam.c PCI: thunder: Drop error data fabrication when config read fails 2021-11-18 13:39:32 -06:00
pci-thunder-pem.c PCI: thunder: Drop error data fabrication when config read fails 2021-11-18 13:39:32 -06:00
pci-v3-semi.c PCI: v3-semi: Remove unneeded break 2020-10-20 10:59:55 -05:00
pci-versatile.c PCI: versatile: Remove redundant variable retval 2022-04-28 10:46:37 +01:00
pci-xgene-msi.c PCI: xgene-msi: Use bitmap_zalloc() when applicable 2021-11-29 17:29:15 +00:00
pci-xgene.c Merge branch 'remotes/lorenzo/pci/xgene' 2022-03-22 17:16:27 -05:00
pcie-altera-msi.c PCI: Bulk conversion to generic_handle_domain_irq() 2021-08-02 11:53:05 -05:00
pcie-altera.c Merge branch 'pci/driver-cleanup' 2022-01-13 09:57:53 -06:00
pcie-apple.c PCI: apple: Change MSI handling to handle 4-cell AIC fwspec form 2022-03-10 09:49:03 +00:00
pcie-brcmstb.c PCI: brcmstb: Prevent config space access when link is down 2022-07-27 11:52:54 -05:00
pcie-hisi-error.c PCI: hip: Add handling of HiSilicon HIP PCIe controller errors 2020-09-16 10:30:42 +01:00
pcie-iproc-bcma.c PCI: Add defines for normal and subtractive PCI bridges 2022-02-17 15:29:35 -06:00
pcie-iproc-msi.c PCI: Bulk conversion to generic_handle_domain_irq() 2021-08-02 11:53:05 -05:00
pcie-iproc-platform.c PCI: iproc: Rename iproc_pcie_pltfm_ to iproc_pltfm_pcie_ 2022-01-03 15:01:53 -06:00
pcie-iproc.c PCI: iproc: Set all 24 bits of PCI class code 2022-02-17 15:30:01 -06:00
pcie-iproc.h PCI: Fix kernel-doc formatting 2021-07-06 10:37:46 -05:00
pcie-mediatek-gen3.c PCI: mediatek-gen3: Assert resets to ensure expected init state 2022-05-11 15:25:26 +01:00
pcie-mediatek.c PCI: mediatek: Fix refcount leak in mtk_pcie_subsys_powerup() 2022-04-08 15:29:44 +01:00
pcie-microchip-host.c PCI: microchip: Fix potential race in interrupt handling 2022-05-18 17:14:21 +01:00
pcie-mt7621.c PCI: mt7621: Remove unused function pcie_rmw() 2022-01-25 18:02:02 -06:00
pcie-rcar-ep.c PCI: rcar-ep: Remove unneeded includes 2021-10-08 09:41:38 -05:00
pcie-rcar-host.c Merge branch 'remotes/lorenzo/pci/rcar' 2022-03-22 17:16:26 -05:00
pcie-rcar.c PCI: rcar: Fix calculating mask for PCIEPAMR register 2020-05-11 11:29:48 +01:00
pcie-rcar.h PCI: rcar: Add L1 link state fix into data abort hook 2021-08-16 14:51:30 +01:00
pcie-rockchip-ep.c PCI: rockchip: Fix find_first_zero_bit() limit 2022-04-08 14:42:07 +01:00
pcie-rockchip-host.c PCI: Add defines for normal and subtractive PCI bridges 2022-02-17 15:29:35 -06:00
pcie-rockchip.c PCI: rockchip: Make 'ep-gpios' DT property optional 2021-02-23 14:23:50 -06:00
pcie-rockchip.h PCI: Add defines for normal and subtractive PCI bridges 2022-02-17 15:29:35 -06:00
pcie-xilinx-cpm.c PCI: xilinx-cpm: Rename xilinx_cpm_pcie_port to xilinx_cpm_pcie 2022-01-03 15:05:28 -06:00
pcie-xilinx-nwl.c PCI: xilinx-nwl: Simplify code and fix a memory leak 2021-12-01 09:26:51 +00:00
pcie-xilinx.c PCI: xilinx: Rename xilinx_pcie_port to xilinx_pcie 2022-01-03 15:05:28 -06:00
vmd.c PCI: vmd: Revert 2565e5b69c ("PCI: vmd: Do not disable MSI-X remapping if interrupt remapping is enabled by IOMMU.") 2022-05-12 15:54:14 +01:00