linux-pci.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
* [PATCH] PCI: dwc: Added link up check in map_bus of dw_child_pcie_ops
@ 2020-09-16  5:41 Zhiqiang Hou
  2020-09-16 20:28 ` Rob Herring
                   ` (3 more replies)
  0 siblings, 4 replies; 42+ messages in thread
From: Zhiqiang Hou @ 2020-09-16  5:41 UTC (permalink / raw)
  To: linux-kernel, linux-pci
  Cc: robh, lorenzo.pieralisi, bhelgaas, gustavo.pimentel, Hou Zhiqiang

From: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>

On NXP Layerscape platforms, it results in SError in the
enumeration of the PCIe controller, which is not connecting
with an Endpoint device. And it doesn't make sense to
enumerate the Endpoints when the PCIe link is down. So this
patch added the link up check to avoid to fire configuration
transactions on link down bus.

[    0.807773] SError Interrupt on CPU2, code 0xbf000002 -- SError
[    0.807775] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 5.9.0-rc5-next-20200914-00001-gf965d3ec86fa #67
[    0.807776] Hardware name: LS1046A RDB Board (DT)
[    0.807777] pstate: 20000085 (nzCv daIf -PAN -UAO BTYPE=--)
[    0.807778] pc : pci_generic_config_read+0x3c/0xe0
[    0.807778] lr : pci_generic_config_read+0x24/0xe0
[    0.807779] sp : ffff80001003b7b0
[    0.807780] x29: ffff80001003b7b0 x28: ffff80001003ba74
[    0.807782] x27: ffff000971d96800 x26: ffff00096e77e0a8
[    0.807784] x25: ffff80001003b874 x24: ffff80001003b924
[    0.807786] x23: 0000000000000004 x22: 0000000000000000
[    0.807788] x21: 0000000000000000 x20: ffff80001003b874
[    0.807790] x19: 0000000000000004 x18: ffffffffffffffff
[    0.807791] x17: 00000000000000c0 x16: fffffe0025981840
[    0.807793] x15: ffffb94c75b69948 x14: 62203a383634203a
[    0.807795] x13: 666e6f635f726568 x12: 202c31203d207265
[    0.807797] x11: 626d756e3e2d7375 x10: 656877202c307830
[    0.807799] x9 : 203d206e66766564 x8 : 0000000000000908
[    0.807801] x7 : 0000000000000908 x6 : ffff800010900000
[    0.807802] x5 : ffff00096e77e080 x4 : 0000000000000000
[    0.807804] x3 : 0000000000000003 x2 : 84fa3440ff7e7000
[    0.807806] x1 : 0000000000000000 x0 : ffff800010034000
[    0.807808] Kernel panic - not syncing: Asynchronous SError Interrupt
[    0.807809] CPU: 2 PID: 1 Comm: swapper/0 Not tainted 5.9.0-rc5-next-20200914-00001-gf965d3ec86fa #67
[    0.807810] Hardware name: LS1046A RDB Board (DT)
[    0.807811] Call trace:
[    0.807812]  dump_backtrace+0x0/0x1c0
[    0.807813]  show_stack+0x18/0x28
[    0.807814]  dump_stack+0xd8/0x134
[    0.807814]  panic+0x180/0x398
[    0.807815]  add_taint+0x0/0xb0
[    0.807816]  arm64_serror_panic+0x78/0x88
[    0.807817]  do_serror+0x68/0x180
[    0.807818]  el1_error+0x84/0x100
[    0.807818]  pci_generic_config_read+0x3c/0xe0
[    0.807819]  dw_pcie_rd_other_conf+0x78/0x110
[    0.807820]  pci_bus_read_config_dword+0x88/0xe8
[    0.807821]  pci_bus_generic_read_dev_vendor_id+0x30/0x1b0
[    0.807822]  pci_bus_read_dev_vendor_id+0x4c/0x78
[    0.807823]  pci_scan_single_device+0x80/0x100
[    0.807824]  pci_scan_slot+0x38/0x130
[    0.807825]  pci_scan_child_bus_extend+0x54/0x2a0
[    0.807826]  pci_scan_child_bus+0x14/0x20
[    0.807827]  pci_scan_bridge_extend+0x230/0x570
[    0.807828]  pci_scan_child_bus_extend+0x134/0x2a0
[    0.807829]  pci_scan_root_bus_bridge+0x64/0xf0
[    0.807829]  pci_host_probe+0x18/0xc8
[    0.807830]  dw_pcie_host_init+0x220/0x378
[    0.807831]  ls_pcie_probe+0x104/0x140
[    0.807832]  platform_drv_probe+0x54/0xa8
[    0.807833]  really_probe+0x118/0x3e0
[    0.807834]  driver_probe_device+0x5c/0xc0
[    0.807835]  device_driver_attach+0x74/0x80
[    0.807835]  __driver_attach+0x8c/0xd8
[    0.807836]  bus_for_each_dev+0x7c/0xd8
[    0.807837]  driver_attach+0x24/0x30
[    0.807838]  bus_add_driver+0x154/0x200
[    0.807839]  driver_register+0x64/0x120
[    0.807839]  __platform_driver_probe+0x7c/0x148
[    0.807840]  ls_pcie_driver_init+0x24/0x30
[    0.807841]  do_one_initcall+0x60/0x1d8
[    0.807842]  kernel_init_freeable+0x1f4/0x24c
[    0.807843]  kernel_init+0x14/0x118
[    0.807843]  ret_from_fork+0x10/0x34
[    0.807854] SMP: stopping secondary CPUs
[    0.807855] Kernel Offset: 0x394c64080000 from 0xffff800010000000
[    0.807856] PHYS_OFFSET: 0xffff8bfd40000000
[    0.807856] CPU features: 0x0240022,21806000
[    0.807857] Memory Limit: none

Fixes: c2b0c098fbd1 ("PCI: dwc: Use generic config accessors")
Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
---
 drivers/pci/controller/dwc/pcie-designware-host.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index c01c9d2fb3f9..e82b518430c5 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -442,6 +442,9 @@ static void __iomem *dw_pcie_other_conf_map_bus(struct pci_bus *bus,
 	struct pcie_port *pp = bus->sysdata;
 	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
 
+	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));
 
-- 
2.17.1


^ permalink raw reply related	[flat|nested] 42+ messages in thread

end of thread, other threads:[~2020-10-22  6:20 UTC | newest]

Thread overview: 42+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-09-16  5:41 [PATCH] PCI: dwc: Added link up check in map_bus of dw_child_pcie_ops Zhiqiang Hou
2020-09-16 20:28 ` Rob Herring
2020-09-18 11:02   ` Z.q. Hou
2020-09-18 11:14     ` Michael Walle
2020-09-21 14:48       ` Z.q. Hou
2020-09-18 12:47     ` Bjorn Helgaas
2020-09-21 16:31       ` Z.q. Hou
2020-09-18 15:27     ` Rob Herring
2020-09-24  4:24       ` Z.q. Hou
2020-09-28  9:39         ` Lorenzo Pieralisi
2020-09-29  4:05           ` Z.q. Hou
2020-09-29 15:24             ` Gustavo Pimentel
2020-09-29 17:11               ` Rob Herring
2020-09-30 13:22                 ` Kishon Vijay Abraham I
2020-09-30 15:01                   ` Rob Herring
2020-10-01 13:32                     ` Kishon Vijay Abraham I
2020-10-01 16:46                       ` Michael Walle
2020-10-02  9:29                         ` Naresh Kamboju
2020-10-08 14:46                           ` Naresh Kamboju
2020-10-08 15:12                             ` Rob Herring
2020-10-08 16:51                               ` Naresh Kamboju
2020-10-08 15:08                       ` Lorenzo Pieralisi
2020-10-12 16:31                         ` Kishon Vijay Abraham I
2020-10-12  4:41                       ` Z.q. Hou
2020-10-19 16:13                         ` Lorenzo Pieralisi
2020-10-20  8:07                           ` Kishon Vijay Abraham I
2020-10-12  4:22                 ` Z.q. Hou
2020-10-20  9:48       ` Lorenzo Pieralisi
2020-10-13  9:15 ` Lorenzo Pieralisi
2020-10-14 11:13 ` Lorenzo Pieralisi
2020-10-14 12:37   ` Rob Herring
2020-10-15 22:47 ` Bjorn Helgaas
2020-10-16 11:59   ` Lorenzo Pieralisi
2020-10-19  5:24   ` Z.q. Hou
2020-10-19  5:41     ` Kishon Vijay Abraham I
2020-10-20  2:13       ` Z.q. Hou
2020-10-20  9:12         ` Lorenzo Pieralisi
2020-10-20  9:55         ` Lorenzo Pieralisi
2020-10-21  8:47           ` Z.q. Hou
2020-10-22  6:20             ` Richard Zhu
2020-10-19 16:26   ` Lorenzo Pieralisi
2020-10-20 10:19   ` Lorenzo Pieralisi

This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).