RC6 residency should be in intervals of 1.28us, and the counter wraps.
Here is an example using awk to get the various RC6 and RC6+ residency
times 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. An
upcoming patch to add interfaces should be more interesting to
application developers.
CC: Ouping Zhang <ouping.zhang at intel.com>
Signed-off-by: Ben Widawsky <ben at bwidawsk.net>
Reviewed-by: Eugeni Dodonov <eugeni.dodonov at intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
---
drivers/gpu/drm/i915/i915_debugfs.c | 11 +++++++++++
drivers/gpu/drm/i915/i915_reg.h | 5 +++++
2 files changed, 16 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_debugfs.c b/drivers/gpu/drm/i915/i915_debugfs.c
index 66c90d4..72457ff 100644
--- a/drivers/gpu/drm/i915/i915_debugfs.c
+++ b/drivers/gpu/drm/i915/i915_debugfs.c
@@ -1133,6 +1133,17 @@ 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 \"Locked to RPn\" residency since boot: %d\n",
+ I915_READ(GEN6_GT_GFX_RC6_LOCKED));
+ /* Not exactly sure what this is */
+ 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));
+ seq_printf(m, "RC6++ residency since boot: %d\n",
+ I915_READ(GEN6_GT_GFX_RC6pp));
+
return 0;
}
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index f3609f2..b1c3d35 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -3799,6 +3799,11 @@
GEN6_PM_RP_DOWN_THRESHOLD | \
GEN6_PM_RP_DOWN_TIMEOUT)
+#define GEN6_GT_GFX_RC6_LOCKED 0x138104
+#define GEN6_GT_GFX_RC6 0x138108
+#define GEN6_GT_GFX_RC6p 0x13810C
+#define GEN6_GT_GFX_RC6pp 0x138110
+
#define GEN6_PCODE_MAILBOX 0x138124
#define GEN6_PCODE_READY (1<<31)
#define GEN6_READ_OC_PARAMS 0xc
--
1.7.9.4
