pci: Add PCI LRDT tag size and section size
This patch adds a preprocessor constant to describe the PCI VPD large
resource data type tag size and an inline function to extract the large
resource section size from the large resource data type tag.
Signed-off-by: Matt Carlson <mcarlson@broadcom.com>
Signed-off-by: Michael Chan <mchan@broadcom.com>
Acked-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/include/linux/pci.h b/include/linux/pci.h
index e2575f8..6f62a49 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -1349,5 +1349,19 @@
void pci_request_acs(void);
+
+#define PCI_VPD_LRDT_TAG_SIZE 3
+
+/**
+ * pci_vpd_lrdt_size - Extracts the Large Resource Data Type length
+ * @lrdt: Pointer to the beginning of the Large Resource Data Type tag
+ *
+ * Returns the extracted Large Resource Data Type length.
+ */
+static inline u16 pci_vpd_lrdt_size(const u8 *lrdt)
+{
+ return (u16)lrdt[1] + ((u16)lrdt[2] << 8);
+}
+
#endif /* __KERNEL__ */
#endif /* LINUX_PCI_H */