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15b2390634
NXP Layerscape (ls1028a, ls2088a), dra7xxx and imx6 platforms are either programmed or statically configured to forward the error triggered by a link-down state (eg no connected endpoint device) on the system bus for PCI configuration transactions; these errors are reported as an SError at system level, which is fatal. Enumerating a PCI tree when the PCIe link is down is not sensible either, so even if the link-up check is racy (link can go down after map_bus() is called) add a link-up check in map_bus() to prevent issuing configuration transactions when the link is down. SError report: SError Interrupt on CPU2, code 0xbf000002 -- SError CPU: 2 PID: 1 Comm: swapper/0 Not tainted 5.9.0-rc5-next-20200914-00001-gf965d3ec86fa #67 Hardware name: LS1046A RDB Board (DT) pstate: 20000085 (nzCv daIf -PAN -UAO BTYPE=--) pc : pci_generic_config_read+0x3c/0xe0 lr : pci_generic_config_read+0x24/0xe0 sp : ffff80001003b7b0 x29: ffff80001003b7b0 x28: ffff80001003ba74 x27: ffff000971d96800 x26: ffff00096e77e0a8 x25: ffff80001003b874 x24: ffff80001003b924 x23: 0000000000000004 x22: 0000000000000000 x21: 0000000000000000 x20: ffff80001003b874 x19: 0000000000000004 x18: ffffffffffffffff x17: 00000000000000c0 x16: fffffe0025981840 x15: ffffb94c75b69948 x14: 62203a383634203a x13: 666e6f635f726568 x12: 202c31203d207265 x11: 626d756e3e2d7375 x10: 656877202c307830 x9 : 203d206e66766564 x8 : 0000000000000908 x7 : 0000000000000908 x6 : ffff800010900000 x5 : ffff00096e77e080 x4 : 0000000000000000 x3 : 0000000000000003 x2 : 84fa3440ff7e7000 x1 : 0000000000000000 x0 : ffff800010034000 Kernel panic - not syncing: Asynchronous SError Interrupt CPU: 2 PID: 1 Comm: swapper/0 Not tainted 5.9.0-rc5-next-20200914-00001-gf965d3ec86fa #67 Hardware name: LS1046A RDB Board (DT) Call trace: dump_backtrace+0x0/0x1c0 show_stack+0x18/0x28 dump_stack+0xd8/0x134 panic+0x180/0x398 add_taint+0x0/0xb0 arm64_serror_panic+0x78/0x88 do_serror+0x68/0x180 el1_error+0x84/0x100 pci_generic_config_read+0x3c/0xe0 dw_pcie_rd_other_conf+0x78/0x110 pci_bus_read_config_dword+0x88/0xe8 pci_bus_generic_read_dev_vendor_id+0x30/0x1b0 pci_bus_read_dev_vendor_id+0x4c/0x78 pci_scan_single_device+0x80/0x100 Link: https://lore.kernel.org/r/20200916054130.8685-1-Zhiqiang.Hou@nxp.com Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com> [lorenzo.pieralisi@arm.com: rewrote the commit log, remove Fixes tag] Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> |
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| .. | ||
| controller | ||
| endpoint | ||
| hotplug | ||
| pcie | ||
| switch | ||
| access.c | ||
| ats.c | ||
| bus.c | ||
| ecam.c | ||
| host-bridge.c | ||
| iov.c | ||
| irq.c | ||
| Kconfig | ||
| Makefile | ||
| mmap.c | ||
| msi.c | ||
| of.c | ||
| p2pdma.c | ||
| pci-acpi.c | ||
| pci-bridge-emul.c | ||
| pci-bridge-emul.h | ||
| pci-driver.c | ||
| pci-label.c | ||
| pci-mid.c | ||
| pci-pf-stub.c | ||
| pci-stub.c | ||
| pci-sysfs.c | ||
| pci.c | ||
| pci.h | ||
| probe.c | ||
| proc.c | ||
| quirks.c | ||
| remove.c | ||
| rom.c | ||
| search.c | ||
| setup-bus.c | ||
| setup-irq.c | ||
| setup-res.c | ||
| slot.c | ||
| syscall.c | ||
| vc.c | ||
| vpd.c | ||
| xen-pcifront.c | ||