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| author | Bjorn Helgaas <bhelgaas@google.com> | 2025-02-14 18:03:01 -0600 |
|---|---|---|
| committer | Bjorn Helgaas <bhelgaas@google.com> | 2025-03-10 13:41:47 -0500 |
| commit | a7eb9124d92be1330afd18c98e4f28f297b50cb8 (patch) | |
| tree | 4de22108cc97c5787754d0ce6260d937e62f42ed /include/linux/pci.h | |
| parent | 3f8c4959fc18e477801386a625e726c59f52a2c4 (diff) | |
| download | linux-a7eb9124d92be1330afd18c98e4f28f297b50cb8.tar.gz linux-a7eb9124d92be1330afd18c98e4f28f297b50cb8.tar.bz2 linux-a7eb9124d92be1330afd18c98e4f28f297b50cb8.zip | |
PCI: Cache offset of Resizable BAR capability
Previously most resizable BAR interfaces (pci_rebar_get_possible_sizes(),
pci_rebar_set_size(), etc) as well as pci_restore_state() searched config
space for a Resizable BAR capability. Most devices don't have such a
capability, so this is wasted effort, especially for pci_restore_state().
Search for a Resizable BAR capability once at enumeration-time and cache
the offset so we don't have to search every time we need it. No functional
change intended.
Link: https://lore.kernel.org/r/20250215000301.175097-3-helgaas@kernel.org
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Diffstat (limited to 'include/linux/pci.h')
| -rw-r--r-- | include/linux/pci.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/pci.h b/include/linux/pci.h index 47b31ad724fa..9e5bbd996c83 100644 --- a/include/linux/pci.h +++ b/include/linux/pci.h @@ -353,6 +353,7 @@ struct pci_dev { struct pci_dev *rcec; /* Associated RCEC device */ #endif u32 devcap; /* PCIe Device Capabilities */ + u16 rebar_cap; /* Resizable BAR capability offset */ u8 pcie_cap; /* PCIe capability offset */ u8 msi_cap; /* MSI capability offset */ u8 msix_cap; /* MSI-X capability offset */ |