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b97bf44f99
linux/arch/s390
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Niklas Schnelle b97bf44f99 s390/pci: fix PF/VF linking on hot plug 
Currently there are four places in which a PCI function is scanned
and made available to drivers:
 1. In pci_scan_root_bus() as part of the initial zbus
    creation.
 2. In zpci_bus_add_devices() when registering
    a device in configured state on a zbus that has already been
    scanned.
 3. When a function is already known to zPCI (in reserved/standby state)
    and configuration is triggered through firmware by PEC 0x301.
 4. When a device is already known to zPCI (in standby/reserved state)
    and configuration is triggered from within Linux using
    enable_slot().

The PF/VF linking step and setting of pdev->is_virtfn introduced with
commit e5794cf1a2 ("s390/pci: create links between PFs and VFs") was
only triggered for the second case, which is where VFs created through
sriov_numvfs usually land. However unlike some other platforms but like
POWER VFs can be individually enabled/disabled through
/sys/bus/pci/slots.

Fix this by doing VF setup as part of pcibios_bus_add_device() which is
called in all of the above cases.

Finally to remove the PF/VF links call the common code
pci_iov_remove_virtfn() function to remove linked VFs.
This takes care of the necessary sysfs cleanup.

Fixes: e5794cf1a2 ("s390/pci: create links between PFs and VFs")
Cc: <stable@vger.kernel.org> # 5.8: 2f0230b2f2: s390/pci: re-introduce zpci_remove_device()
Cc: <stable@vger.kernel.org> # 5.8
Acked-by: Pierre Morel <pmorel@linux.ibm.com>
Signed-off-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
2020-08-17 13:17:34 +02:00
..
appldata s390/appldata: use struct_size() helper 2020-06-29 16:32:34 +02:00
boot mm: reorder includes after introduction of linux/pgtable.h 2020-06-09 09:39:13 -07:00
configs s390: update defconfigs 2020-07-01 20:02:38 +02:00
crypto mm, treewide: rename kzfree() to kfree_sensitive() 2020-08-07 11:33:22 -07:00
hypfs fs_parse: fold fs_parameter_desc/fs_parameter_spec 2020-02-07 14:48:37 -05:00
include - Allow s390 debug feature to handle finally more than 256 CPU numbers, instead 2020-08-13 12:38:32 -07:00
kernel s390/ptrace: fix storage key handling 2020-08-17 13:17:14 +02:00
kvm mm/gup: remove task_struct pointer for all gup code 2020-08-12 10:58:04 -07:00
lib s390/test_unwind: fix possible memleak in test_unwind() 2020-08-11 18:16:16 +02:00
mm - Allow s390 debug feature to handle finally more than 256 CPU numbers, instead 2020-08-13 12:38:32 -07:00
net Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2020-08-05 20:13:21 -07:00
oprofile s390/unwind: introduce stack unwind API 2019-05-02 13:54:11 +02:00
pci s390/pci: fix PF/VF linking on hot plug 2020-08-17 13:17:34 +02:00
purgatory .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
scripts s390/build: use size command to perform empty .bss check 2019-08-08 14:36:53 +02:00
tools .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
Kbuild s390/numa: move code to arch/s390/kernel 2020-08-11 18:16:55 +02:00
Kconfig s390/time: remove select CLOCKSOURCE_VALIDATE_LAST_CYCLE again 2020-08-11 18:16:48 +02:00
Kconfig.debug treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
Makefile kbuild: remove cc-option test of -ffreestanding 2020-07-07 11:13:10 +09:00