PCI: support PCIe ARI capability
This patch adds support for PCI Express Alternative Routing-ID
Interpretation (ARI) capability.
The ARI capability extends the Function Number field of the PCI Express
Endpoint by reusing the Device Number which is otherwise hardwired to 0.
With ARI, an Endpoint can have up to 256 functions.
Signed-off-by: Yu Zhao <yu.zhao@intel.com>
Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
diff --git a/include/linux/pci_regs.h b/include/linux/pci_regs.h
index 450684f..eb6686b 100644
--- a/include/linux/pci_regs.h
+++ b/include/linux/pci_regs.h
@@ -419,6 +419,10 @@
#define PCI_EXP_RTCTL_CRSSVE 0x10 /* CRS Software Visibility Enable */
#define PCI_EXP_RTCAP 30 /* Root Capabilities */
#define PCI_EXP_RTSTA 32 /* Root Status */
+#define PCI_EXP_DEVCAP2 36 /* Device Capabilities 2 */
+#define PCI_EXP_DEVCAP2_ARI 0x20 /* Alternative Routing-ID */
+#define PCI_EXP_DEVCTL2 40 /* Device Control 2 */
+#define PCI_EXP_DEVCTL2_ARI 0x20 /* Alternative Routing-ID */
/* Extended Capabilities (PCI-X 2.0 and Express) */
#define PCI_EXT_CAP_ID(header) (header & 0x0000ffff)
@@ -429,6 +433,7 @@
#define PCI_EXT_CAP_ID_VC 2
#define PCI_EXT_CAP_ID_DSN 3
#define PCI_EXT_CAP_ID_PWR 4
+#define PCI_EXT_CAP_ID_ARI 14
/* Advanced Error Reporting */
#define PCI_ERR_UNCOR_STATUS 4 /* Uncorrectable Error Status */
@@ -536,5 +541,14 @@
#define HT_CAPTYPE_GEN3 0xD0 /* Generation 3 hypertransport configuration */
#define HT_CAPTYPE_PM 0xE0 /* Hypertransport powermanagement configuration */
+/* Alternative Routing-ID Interpretation */
+#define PCI_ARI_CAP 0x04 /* ARI Capability Register */
+#define PCI_ARI_CAP_MFVC 0x0001 /* MFVC Function Groups Capability */
+#define PCI_ARI_CAP_ACS 0x0002 /* ACS Function Groups Capability */
+#define PCI_ARI_CAP_NFN(x) (((x) >> 8) & 0xff) /* Next Function Number */
+#define PCI_ARI_CTRL 0x06 /* ARI Control Register */
+#define PCI_ARI_CTRL_MFVC 0x0001 /* MFVC Function Groups Enable */
+#define PCI_ARI_CTRL_ACS 0x0002 /* ACS Function Groups Enable */
+#define PCI_ARI_CTRL_FG(x) (((x) >> 4) & 7) /* Function Group */
#endif /* LINUX_PCI_REGS_H */