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PCI: Add pci_find_vsec_capability() to find a specific VSEC 

Add pci_find_vsec_capability() to locate a Vendor-Specific Extended
Capability with the specified VSEC ID.

The Vendor-Specific Extended Capability (VSEC) allows one or more
proprietary capabilities defined by the vendor which aren't standard
or shared between vendors.

Signed-off-by: Gustavo Pimentel <gustavo.pimentel@synopsys.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://lore.kernel.org/r/d89506834fb11c6fa0bd5d515c0dd55b13ac6958.1613674948.git.gustavo.pimentel@synopsys.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
This commit is contained in:
Gustavo Pimentel 2021-02-18 20:03:58 +01:00 committed by Vinod Koul
parent e0c1d53891
commit c124fd9a96
2 changed files with 31 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

30
drivers/pci/pci.c
View File

@ -692,6 +692,36 @@ u8 pci_find_ht_capability(struct pci_dev *dev, int ht_cap)
}
EXPORT_SYMBOL_GPL(pci_find_ht_capability);
/**
* pci_find_vsec_capability - Find a vendor-specific extended capability
* @dev: PCI device to query
* @vendor: Vendor ID for which capability is defined
* @cap: Vendor-specific capability ID
*
* If @dev has Vendor ID @vendor, search for a VSEC capability with
* VSEC ID @cap. If found, return the capability offset in
* config space; otherwise return 0.
*/
u16 pci_find_vsec_capability(struct pci_dev *dev, u16 vendor, int cap)
{
u16 vsec = 0;
u32 header;
if (vendor != dev->vendor)
return 0;
while ((vsec = pci_find_next_ext_capability(dev, vsec,
PCI_EXT_CAP_ID_VNDR))) {
if (pci_read_config_dword(dev, vsec + PCI_VNDR_HEADER,
&header) == PCIBIOS_SUCCESSFUL &&
PCI_VNDR_HEADER_ID(header) == cap)
return vsec;
}
return 0;
}
EXPORT_SYMBOL_GPL(pci_find_vsec_capability);
/**
* pci_find_parent_resource - return resource region of parent bus of given
* region

1
include/linux/pci.h
View File

@ -1077,6 +1077,7 @@ u8 pci_find_next_ht_capability(struct pci_dev *dev, u8 pos, int ht_cap);
u16 pci_find_ext_capability(struct pci_dev *dev, int cap);
u16 pci_find_next_ext_capability(struct pci_dev *dev, u16 pos, int cap);
struct pci_bus *pci_find_next_bus(const struct pci_bus *from);
u16 pci_find_vsec_capability(struct pci_dev *dev, u16 vendor, int cap);
u64 pci_get_dsn(struct pci_dev *dev);