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authorJesse Barnes <jbarnes@virtuousgeek.org>2011-01-14 19:53:04 +0300
committerJesse Barnes <jbarnes@virtuousgeek.org>2011-05-12 02:18:53 +0400
commit51c2e0a7e5bc7ed1384cc68cfb95e702571500c9 (patch)
tree839dc5d6eb233b009c8802cb8cafde68f5a2ce6e /include/linux/pci_regs.h
parent48a92a8179b3e677fac07db7bd109e68f020468c (diff)
downloadlinux-51c2e0a7e5bc7ed1384cc68cfb95e702571500c9.tar.xz
PCI: add latency tolerance reporting enable/disable support
Latency tolerance reporting allows devices to send messages to the root complex indicating their latency tolerance for snooped & unsnooped memory transactions. Add support for enabling & disabling this feature, along with a routine to set the max latencies a device should send upstream. Signed-off-by: Jesse Barnes <jbarnes@virtuousgeek.org>
Diffstat (limited to 'include/linux/pci_regs.h')
-rw-r--r--include/linux/pci_regs.h9
1 files changed, 9 insertions, 0 deletions
diff --git a/include/linux/pci_regs.h b/include/linux/pci_regs.h
index aa420261843d..e8840964aca1 100644
--- a/include/linux/pci_regs.h
+++ b/include/linux/pci_regs.h
@@ -508,6 +508,7 @@
#define PCI_EXP_RTSTA_PENDING 0x20000 /* PME pending */
#define PCI_EXP_DEVCAP2 36 /* Device Capabilities 2 */
#define PCI_EXP_DEVCAP2_ARI 0x20 /* Alternative Routing-ID */
+#define PCI_EXP_DEVCAP2_LTR 0x800 /* Latency tolerance reporting */
#define PCI_EXP_OBFF_MASK 0xc0000 /* OBFF support mechanism */
#define PCI_EXP_OBFF_MSG 0x40000 /* New message signaling */
#define PCI_EXP_OBFF_WAKE 0x80000 /* Re-use WAKE# for OBFF */
@@ -515,6 +516,7 @@
#define PCI_EXP_DEVCTL2_ARI 0x20 /* Alternative Routing-ID */
#define PCI_EXP_IDO_REQ_EN 0x100 /* ID-based ordering request enable */
#define PCI_EXP_IDO_CMP_EN 0x200 /* ID-based ordering completion enable */
+#define PCI_EXP_LTR_EN 0x400 /* Latency tolerance reporting */
#define PCI_EXP_OBFF_MSGA_EN 0x2000 /* OBFF enable with Message type A */
#define PCI_EXP_OBFF_MSGB_EN 0x4000 /* OBFF enable with Message type B */
#define PCI_EXP_OBFF_WAKE_EN 0x6000 /* OBFF using WAKE# signaling */
@@ -535,6 +537,7 @@
#define PCI_EXT_CAP_ID_ARI 14
#define PCI_EXT_CAP_ID_ATS 15
#define PCI_EXT_CAP_ID_SRIOV 16
+#define PCI_EXT_CAP_ID_LTR 24
/* Advanced Error Reporting */
#define PCI_ERR_UNCOR_STATUS 4 /* Uncorrectable Error Status */
@@ -691,6 +694,12 @@
#define PCI_SRIOV_VFM_MO 0x2 /* Active.MigrateOut */
#define PCI_SRIOV_VFM_AV 0x3 /* Active.Available */
+#define PCI_LTR_MAX_SNOOP_LAT 0x4
+#define PCI_LTR_MAX_NOSNOOP_LAT 0x6
+#define PCI_LTR_VALUE_MASK 0x000003ff
+#define PCI_LTR_SCALE_MASK 0x00001c00
+#define PCI_LTR_SCALE_SHIFT 10
+
/* Access Control Service */
#define PCI_ACS_CAP 0x04 /* ACS Capability Register */
#define PCI_ACS_SV 0x01 /* Source Validation */