PCI: Add #defines for accessing PCIe DVSEC fields

Add #defines for accessing Vendor ID, Revision, Length, and ID offsets
in the Designated Vendor Specific Extended Capability (DVSEC). Defined
in PCIe r5.0, sec 7.9.6.

Reviewed-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Acked-by: Bjorn Helgaas <bhelgaas@google.com>
Signed-off-by: David E. Box <david.e.box@linux.intel.com>
Link: https://lore.kernel.org/r/20211208015015.891275-2-david.e.box@linux.intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/include/uapi/linux/pci_regs.h b/include/uapi/linux/pci_regs.h
index ff6ccbc6efe96b44953f63ad1a61792317a6e769..318f3f1f9e92f9e7ea8e4c28069800fe49a9c934 100644 (file)
--- a/include/uapi/linux/pci_regs.h
+++ b/include/uapi/linux/pci_regs.h
@@ -1086,7 +1086,11 @@
 
 /* Designated Vendor-Specific (DVSEC, PCI_EXT_CAP_ID_DVSEC) */
 #define PCI_DVSEC_HEADER1              0x4 /* Designated Vendor-Specific Header1 */
+#define  PCI_DVSEC_HEADER1_VID(x)      ((x) & 0xffff)
+#define  PCI_DVSEC_HEADER1_REV(x)      (((x) >> 16) & 0xf)
+#define  PCI_DVSEC_HEADER1_LEN(x)      (((x) >> 20) & 0xfff)
 #define PCI_DVSEC_HEADER2              0x8 /* Designated Vendor-Specific Header2 */
+#define  PCI_DVSEC_HEADER2_ID(x)               ((x) & 0xffff)
 
 /* Data Link Feature */
 #define PCI_DLF_CAP            0x04    /* Capabilities Register */