[SPDK] PCI hotplug and SPDK

[Oza Oza <oza.oza at broadcom.com>]

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Hi All,



PCI hotplug support; requires creation of root bus and probe to go ahead
with all PCIe configuration.



Which means following APIs ae not called.

   pci_stop_root_bus(bus);

   pci_remove_root_bus(bus);





And then If I run SPDK, It makes system crash with following info.



Note: if the disk is connected then SPDK is fine.



Otherwise it stalls the system with following crash.



root(a)bcm958742k:~# echo 2048 > /proc/sys/vm/nr_hugepages;
/usr/share/spdk/scripts/setup.sh

grep: /usr/share/spdk/scripts/../include/spdk/pci_ids.h: No such[
34.621325] pci 0008:00:00.0: PCI bridge to [bus 01]

file or directory

[   34.640586] pci 0000:00:00.0: bridge configuration invalid ([bus
00-00]), reconfiguring

[   50.267056] pci 0000:00:00.0: PCI bridge to [bus 01]

[   50.272337] pci 0001:00:00.0: bridge configuration invalid ([bus
00-00]), reconfiguring

[   65.898762] pci 0001:00:00.0: PCI bridge to [bus 01]

[   65.904015] pci 0006:00:00.0: bridge configuration invalid ([bus
00-00]), reconfiguring

[   81.530437] pci 0006:00:00.0: PCI bridge to [bus 01]

[   81.535680] pci 0007:00:00.0: bridge configuration invalid ([bus
00-00]), reconfiguring

[   97.162103] pci 0007:00:00.0: PCI bridge to [bus 01]

[   97.167255] Bad mode in Error handler detected on CPU6, code 0xbf000002
-- SError

[   97.174974] Internal error: Oops - bad mode: 0 [#1] SMP

[   97.180364] Modules linked in:

[   97.183515] CPU: 6 PID: 2104 Comm: bash Not tainted
4.12.0-01560-gc83093d-dirty #89

[   97.191413] Hardware name: Stingray Combo SVK w/PCIe IOMMU (BCM958742K)
(DT)

[   97.198683] task: ffff80a163a40000 task.stack: ffff80a1612b4000

[   97.204790] PC is at 0xffff7cbdfba8

[   97.208387] LR is at 0xffff7cb8f288

[   97.211983] pc : [<0000ffff7cbdfba8>] lr : [<0000ffff7cb8f288>] pstate:
20000000

[   97.219612] sp : 0000fffffe564040

[   97.223029] x29: 0000fffffe564040 x28: 000000001054ce60

[   97.228509] x27: 0000000000000000 x26: 00000000004e2000

[   97.233989] x25: 00000000004e5000 x24: 0000000000000002

[   97.239468] x23: 0000ffff7cc63638 x22: 0000000000000002

[   97.244947] x21: 0000ffff7cc67480 x20: 000000001054db10

[   97.250427] x19: 0000000000000002 x18: 0000000000000000

[   97.255906] x17: 00000000004daac8 x16: 0000000000000000

[   97.261386] x15: 0000000000000096 x14: 0000000000000000

[   97.266865] x13: 0000000000000000 x12: 0000000000000000

[   97.272344] x11: 0000000000000020 x10: 0101010101010101

[   97.277824] x9 : ffffff80ffffffc8 x8 : 0000000000000040

[   97.283303] x7 : 0000000000000001 x6 : 0000ffff7cc669f0

[   97.288782] x5 : 0000000000015551 x4 : 0000000000000888

[   97.294261] x3 : 0000000000000000 x2 : 0000000000000002

[   97.299741] x1 : 000000001054db10 x0 : 0000000000000002

[   97.305220] Process bash (pid: 2104, stack limit = 0xffff80a1612b4000)

[   97.311960] ---[ end trace a1f48abe30820241 ]---



Regards,

Oza.

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