From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>,
Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
Sasha Levin <sashal@kernel.org>,
linux-pci@vger.kernel.org
Subject: [PATCH AUTOSEL 5.4 66/80] PCI: dwc: Add link up check in dw_child_pcie_ops.map_bus()
Date: Mon, 26 Oct 2020 19:55:02 -0400 [thread overview]
Message-ID: <20201026235516.1025100-66-sashal@kernel.org> (raw)
In-Reply-To: <20201026235516.1025100-1-sashal@kernel.org>
From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
[ Upstream commit 15b23906347c0af8778d1d4edeea415290342d35 ]
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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/pci/controller/dwc/pcie-designware-host.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index fbcb211cceb43..152420b9d729c 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -536,6 +536,17 @@ static int dw_pcie_access_other_conf(struct pcie_port *pp, struct pci_bus *bus,
void __iomem *va_cfg_base;
struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
+ /*
+ * Checking whether the link is up here is a last line of defense
+ * against platforms that forward errors on the system bus as
+ * SError upon PCI configuration transactions issued when the link
+ * is down. This check is racy by definition and does not stop
+ * the system from triggering an SError if the link goes down
+ * after this check is performed.
+ */
+ if (!dw_pcie_link_up(pci))
+ return NULL;
+
busdev = PCIE_ATU_BUS(bus->number) | PCIE_ATU_DEV(PCI_SLOT(devfn)) |
PCIE_ATU_FUNC(PCI_FUNC(devfn));
--
2.25.1
next prev parent reply other threads:[~2020-10-27 0:00 UTC|newest]
Thread overview: 81+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-26 23:53 [PATCH AUTOSEL 5.4 01/80] powerpc/powernv/smp: Fix spurious DBG() warning Sasha Levin
2020-10-26 23:53 ` [PATCH AUTOSEL 5.4 02/80] mm: fix exec activate_mm vs TLB shootdown and lazy tlb switching race Sasha Levin
2020-10-26 23:53 ` [PATCH AUTOSEL 5.4 03/80] powerpc: select ARCH_WANT_IRQS_OFF_ACTIVATE_MM Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 04/80] sparc64: remove mm_cpumask clearing to fix kthread_use_mm race Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 05/80] f2fs: add trace exit in exception path Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 06/80] f2fs: fix uninit-value in f2fs_lookup Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 07/80] f2fs: fix to check segment boundary during SIT page readahead Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 08/80] s390/startup: avoid save_area_sync overflow Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 09/80] um: change sigio_spinlock to a mutex Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 10/80] f2fs: handle errors of f2fs_get_meta_page_nofail Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 11/80] MIPS: ftrace: Remove redundant #ifdef CONFIG_DYNAMIC_FTRACE Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 12/80] ARM: 8997/2: hw_breakpoint: Handle inexact watchpoint addresses Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 13/80] NFS4: Fix oops when copy_file_range is attempted with NFS4.0 source Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 14/80] power: supply: bq27xxx: report "not charging" on all types Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 15/80] xfs: fix realtime bitmap/summary file truncation when growing rt volume Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 16/80] video: fbdev: pvr2fb: initialize variables Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 17/80] ath10k: start recovery process when payload length exceeds max htc length for sdio Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 18/80] ath10k: fix VHT NSS calculation when STBC is enabled Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 19/80] drm/brige/megachips: Add checking if ge_b850v3_lvds_init() is working correctly Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 20/80] selftests/x86/fsgsbase: Reap a forgotten child Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 21/80] media: videodev2.h: RGB BT2020 and HSV are always full range Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 22/80] media: platform: Improve queue set up flow for bug fixing Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 23/80] usb: typec: tcpm: During PR_SWAP, source caps should be sent only after tSwapSourceStart Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 24/80] media: tw5864: check status of tw5864_frameinterval_get Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 25/80] media: imx274: fix frame interval handling Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 26/80] mmc: via-sdmmc: Fix data race bug Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 27/80] drm/bridge/synopsys: dsi: add support for non-continuous HS clock Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 28/80] arm64: topology: Stop using MPIDR for topology information Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 29/80] printk: reduce LOG_BUF_SHIFT range for H8300 Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 30/80] ia64: kprobes: Use generic kretprobe trampoline handler Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 31/80] kgdb: Make "kgdbcon" work properly with "kgdb_earlycon" Sasha Levin
2020-10-27 12:01 ` Daniel Thompson
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 32/80] bpf: Permit map_ptr arithmetic with opcode add and offset 0 Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 33/80] media: uvcvideo: Fix dereference of out-of-bound list iterator Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 34/80] selftests/bpf: Define string const as global for test_sysctl_prog.c Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 35/80] samples/bpf: Fix possible deadlock in xdpsock Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 36/80] riscv: Define AT_VECTOR_SIZE_ARCH for ARCH_DLINFO Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 37/80] cpufreq: sti-cpufreq: add stih418 support Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 38/80] USB: adutux: fix debugging Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 39/80] uio: free uio id after uio file node is freed Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 40/80] coresight: Make sysfs functional on topologies with per core sink Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 41/80] usb: xhci: omit duplicate actions when suspending a runtime suspended host Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 42/80] SUNRPC: Mitigate cond_resched() in xprt_transmit() Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 43/80] arm64/mm: return cpu_all_mask when node is NUMA_NO_NODE Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 44/80] can: flexcan: disable clocks during stop mode Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 45/80] xfs: don't free rt blocks when we're doing a REMAP bunmapi call Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 46/80] ACPI: Add out of bounds and numa_off protections to pxm_to_node() Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 47/80] genirq: Add stub for set_handle_irq() when !GENERIC_IRQ_MULTI_HANDLER Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 48/80] dm: change max_io_len() to use blk_max_size_offset() Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 49/80] brcmfmac: Fix warning message after dongle setup failed Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 50/80] drivers/net/wan/hdlc_fr: Correctly handle special skb->protocol values Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 51/80] bus/fsl_mc: Do not rely on caller to provide non NULL mc_io Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 52/80] ACPI: HMAT: Fix handling of changes from ACPI 6.2 to ACPI 6.3 Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 53/80] power: supply: test_power: add missing newlines when printing parameters by sysfs Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 54/80] drm/amd/display: HDMI remote sink need mode validation for Linux Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 55/80] ARC: [dts] fix the errors detected by dtbs_check Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 56/80] btrfs: fix replace of seed device Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 57/80] md/bitmap: md_bitmap_get_counter returns wrong blocks Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 58/80] bnxt_en: Log unknown link speed appropriately Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 59/80] rpmsg: glink: Use complete_all for open states Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 60/80] clk: ti: clockdomain: fix static checker warning Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 61/80] phy: marvell: comphy: Convert internal SMCC firmware return codes to errno Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 62/80] asm-generic/io.h: Fix !CONFIG_GENERIC_IOMAP pci_iounmap() implementation Sasha Levin
2020-10-26 23:54 ` [PATCH AUTOSEL 5.4 63/80] net: 9p: initialize sun_server.sun_path to have addr's value only when addr is valid Sasha Levin
2020-10-26 23:55 ` [PATCH AUTOSEL 5.4 64/80] drivers: watchdog: rdc321x_wdt: Fix race condition bugs Sasha Levin
2020-10-26 23:55 ` [PATCH AUTOSEL 5.4 65/80] ext4: Detect already used quota file early Sasha Levin
2020-10-26 23:55 ` Sasha Levin [this message]
2020-10-26 23:55 ` [PATCH AUTOSEL 5.4 67/80] KVM: PPC: Book3S HV: Do not allocate HPT for a nested guest Sasha Levin
2020-10-26 23:55 ` [PATCH AUTOSEL 5.4 68/80] gfs2: use-after-free in sysfs deregistration Sasha Levin
2020-10-26 23:55 ` [PATCH AUTOSEL 5.4 69/80] gfs2: add validation checks for size of superblock Sasha Levin
2020-10-26 23:55 ` [PATCH AUTOSEL 5.4 70/80] cifs: handle -EINTR in cifs_setattr Sasha Levin
2020-10-26 23:55 ` [PATCH AUTOSEL 5.4 71/80] arm64: dts: renesas: ulcb: add full-pwr-cycle-in-suspend into eMMC nodes Sasha Levin
2020-10-26 23:55 ` [PATCH AUTOSEL 5.4 72/80] ARM: dts: omap4: Fix sgx clock rate for 4430 Sasha Levin
2020-10-26 23:55 ` [PATCH AUTOSEL 5.4 73/80] memory: emif: Remove bogus debugfs error handling Sasha Levin
2020-10-26 23:55 ` [PATCH AUTOSEL 5.4 74/80] ARM: dts: s5pv210: remove DMA controller bus node name to fix dtschema warnings Sasha Levin
2020-10-26 23:55 ` [PATCH AUTOSEL 5.4 75/80] ARM: dts: s5pv210: move fixed clocks under root node Sasha Levin
2020-10-26 23:55 ` [PATCH AUTOSEL 5.4 76/80] ARM: dts: s5pv210: move PMU node out of clock controller Sasha Levin
2020-10-26 23:55 ` [PATCH AUTOSEL 5.4 77/80] ARM: dts: s5pv210: remove dedicated 'audio-subsystem' node Sasha Levin
2020-10-26 23:55 ` [PATCH AUTOSEL 5.4 78/80] nbd: make the config put is called before the notifying the waiter Sasha Levin
2020-10-26 23:55 ` [PATCH AUTOSEL 5.4 79/80] sgl_alloc_order: fix memory leak Sasha Levin
2020-10-26 23:55 ` [PATCH AUTOSEL 5.4 80/80] nvme-rdma: fix crash when connect rejected Sasha Levin
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