RC6 residency should be in intervals of 1.28us, and the counter wraps.
Here is an example using awk to get the RC6 and RC6+ residency in
seconds, since boot.
cat /sys/kernel/debug/dri/0/i915_drpc_info | grep residency | awk -F':' -F' ' '{print $5 * 1.28 / 1000000}'
This is primarily for QA, but has other applications as well.
CC: Arjan van de Ven <arjan at linux.intel.com>
CC: Ouping Zhang <ouping.zhang at intel.com>
Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
---
drivers/gpu/drm/i915/i915_debugfs.c | 6 ++++++
drivers/gpu/drm/i915/i915_reg.h | 3 +++
2 files changed, 9 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 66c90d4..cd67d3c 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1133,6 +1133,12 @@ static int gen6_drpc_info(struct seq_file *m)
seq_printf(m, "Core Power Down: %s\n",
yesno(gt_core_status & GEN6_CORE_CPD_STATE_MASK));
+
+ seq_printf(m, "RC6 residency since boot: %d\n",
+ I915_READ(GEN6_GT_GFX_RC6));
+
+ seq_printf(m, "RC6+ residency since boot: %d\n",
+ I915_READ(GEN6_GT_GFX_RC6p));
return 0;
}
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 52a06be..5382d8b 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3791,6 +3791,9 @@
GEN6_PM_RP_DOWN_THRESHOLD | \
GEN6_PM_RP_DOWN_TIMEOUT)
+#define GEN6_GT_GFX_RC6 0x138108
+#define GEN6_GT_GFX_RC6p 0x13810C
+
#define GEN6_PCODE_MAILBOX 0x138124
#define GEN6_PCODE_READY (1<<31)
#define GEN6_READ_OC_PARAMS 0xc
--
1.7.9.4
