From a7eb9124d92be1330afd18c98e4f28f297b50cb8 Mon Sep 17 00:00:00 2001 From: Bjorn Helgaas Date: Fri, 14 Feb 2025 18:03:01 -0600 Subject: PCI: Cache offset of Resizable BAR capability MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Reviewed-by: Ilpo Järvinen --- include/linux/pci.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/linux') 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 */ -- cgit v1.2.3