[Intel-gfx] [PATCH 15/19] drm/i915/perf: Add Wa_1508761755:dg2

Umesh Nerlige Ramappa
2022-08-23T20:42:26Z

Disable Clock gating in EU when gathering the events so that EU events
are not lost.

Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@intel.com>
---
drivers/gpu/drm/i915/gt/intel_gt_regs.h | 1 +
drivers/gpu/drm/i915/i915_perf.c | 23 +++++++++++++++++++++++
2 files changed, 24 insertions(+)

diff --git a/drivers/gpu/drm/i915/gt/intel_gt_regs.h b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
index 94f9ddcfb3a5..28ef74f948e2 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_regs.h
+++ b/drivers/gpu/drm/i915/gt/intel_gt_regs.h
@@ -1129,6 +1129,7 @@
#define GEN12_DISABLE_EARLY_READ REG_BIT(14)
#define GEN12_ENABLE_LARGE_GRF_MODE REG_BIT(12)
#define GEN12_PUSH_CONST_DEREF_HOLD_DIS REG_BIT(8)
+#define GEN12_DISABLE_DOP_GATING REG_BIT(0)

#define RT_CTRL _MMIO(0xe530)
#define DIS_NULL_QUERY REG_BIT(10)
diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index a858ce57e465..efdd16edf8f3 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -2847,6 +2847,18 @@ gen12_enable_metric_set(struct i915_perf_stream *stream,
u32 sqcnt1;
int ret;

+ /*
+ * Wa_1508761755:xehpsdv, dg2
+ * EU NOA signals behave incorrectly if EU clock gating is enabled.
+ * Disable thread stall DOP gating and EU DOP gating.
+ */
+ if (IS_XEHPSDV(i915) || IS_DG2(i915)) {
+ intel_uncore_write(uncore, GEN8_ROW_CHICKEN,
+ _MASKED_BIT_ENABLE(STALL_DOP_GATING_DISABLE));
+ intel_uncore_write(uncore, GEN7_ROW_CHICKEN2,
+ _MASKED_BIT_ENABLE(GEN12_DISABLE_DOP_GATING));
+ }
+
intel_uncore_write(uncore, GEN12_OAG_OA_DEBUG,
/* Disable clk ratio reports, like previous Gens. */
_MASKED_BIT_ENABLE(GEN12_OAG_OA_DEBUG_DISABLE_CLK_RATIO_REPORTS |
@@ -2925,6 +2937,17 @@ static void gen12_disable_metric_set(struct i915_perf_stream *stream)
struct drm_i915_private *i915 = stream->perf->i915;
u32 sqcnt1;

+ /*
+ * Wa_1508761755:xehpsdv, dg2
+ * Enable thread stall DOP gating and EU DOP gating.
+ */
+ if (IS_XEHPSDV(i915) || IS_DG2(i915)) {
+ intel_uncore_write(uncore, GEN8_ROW_CHICKEN,
+ _MASKED_BIT_DISABLE(STALL_DOP_GATING_DISABLE));
+ intel_uncore_write(uncore, GEN7_ROW_CHICKEN2,
+ _MASKED_BIT_DISABLE(GEN12_DISABLE_DOP_GATING));
+ }
+
/* Reset all contexts' slices/subslices configurations. */
gen12_configure_all_contexts(stream, NULL, NULL);

--
2.25.1