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| author | Keith Busch <kbusch@kernel.org> | 2024-10-26 00:27:54 +0200 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2024-11-13 23:43:34 +0100 |
| commit | 2fa046449a82a7d0f6d9721dd83e348816038444 (patch) | |
| tree | a0fd994dd816d1da3e5f6ad0f0c30fff194d9e3f /drivers/pci/pci.h | |
| parent | Linux 6.12-rc1 (diff) | |
| download | linux-2fa046449a82a7d0f6d9721dd83e348816038444.tar.xz linux-2fa046449a82a7d0f6d9721dd83e348816038444.zip | |
PCI: Add 'reset_subordinate' to reset hierarchy below bridge
The "bus" and "cxl_bus" reset methods reset a device by asserting Secondary
Bus Reset on the bridge leading to the device. These only work if the
device is the only device below the bridge.
Add a sysfs 'reset_subordinate' attribute on bridges that can assert
Secondary Bus Reset regardless of how many devices are below the bridge.
This resets all the devices below a bridge in a single command, including
the locking and config space save/restore that reset methods normally do.
This may be the only way to reset devices that don't support other reset
methods (ACPI, FLR, PM reset, etc).
Link: https://lore.kernel.org/r/20241025222755.3756162-1-kbusch@meta.com
Signed-off-by: Keith Busch <kbusch@kernel.org>
[bhelgaas: commit log, add capable(CAP_SYS_ADMIN) check]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Alex Williamson <alex.williamson@redhat.com>
Reviewed-by: Amey Narkhede <ameynarkhede03@gmail.com>
Diffstat (limited to 'drivers/pci/pci.h')
| -rw-r--r-- | drivers/pci/pci.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h index 14d00ce45bfa..1cdc2c9547a7 100644 --- a/drivers/pci/pci.h +++ b/drivers/pci/pci.h @@ -104,6 +104,7 @@ bool pci_reset_supported(struct pci_dev *dev); void pci_init_reset_methods(struct pci_dev *dev); int pci_bridge_secondary_bus_reset(struct pci_dev *dev); int pci_bus_error_reset(struct pci_dev *dev); +int __pci_reset_bus(struct pci_bus *bus); struct pci_cap_saved_data { u16 cap_nr; |