Re: [PATCH 2/2] drm/i915/perf: Configure OAR for specific context

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On 14/11/2019 21:21, Umesh Nerlige Ramappa wrote:
Gen12 supports saving/restoring render counters per context. Apply OAR
configuration only for the context that is passed in to perf.

v2:
- Fix OACTXCONTROL value to only stop/resume counters.
- Remove gen12_update_reg_state_unlocked as power state is already
   applied by the caller.

Signed-off-by: Umesh Nerlige Ramappa <umesh.nerlige.ramappa@xxxxxxxxx>
---
  drivers/gpu/drm/i915/i915_perf.c | 193 +++++++++++++++++--------------
  1 file changed, 108 insertions(+), 85 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_perf.c b/drivers/gpu/drm/i915/i915_perf.c
index 221c1090ae93..2f0be5fbef4b 100644
--- a/drivers/gpu/drm/i915/i915_perf.c
+++ b/drivers/gpu/drm/i915/i915_perf.c
@@ -2078,20 +2078,12 @@ gen8_update_reg_state_unlocked(const struct intel_context *ce,
  	u32 *reg_state = ce->lrc_reg_state;
  	int i;
- if (IS_GEN(stream->perf->i915, 12)) {
-		u32 format = stream->oa_buffer.format;
+	reg_state[ctx_oactxctrl + 1] =
+		(stream->period_exponent << GEN8_OA_TIMER_PERIOD_SHIFT) |
+		(stream->periodic ? GEN8_OA_TIMER_ENABLE : 0) |
+		GEN8_OA_COUNTER_RESUME;
- reg_state[ctx_oactxctrl + 1] =
-			(format << GEN12_OAR_OACONTROL_COUNTER_FORMAT_SHIFT) |
-			(stream->oa_config ? GEN12_OAR_OACONTROL_COUNTER_ENABLE : 0);
-	} else {
-		reg_state[ctx_oactxctrl + 1] =
-			(stream->period_exponent << GEN8_OA_TIMER_PERIOD_SHIFT) |
-			(stream->periodic ? GEN8_OA_TIMER_ENABLE : 0) |
-			GEN8_OA_COUNTER_RESUME;
-	}
-
-	for (i = 0; !!ctx_flexeu0 && i < ARRAY_SIZE(flex_regs); i++)
+	for (i = 0; i < ARRAY_SIZE(flex_regs); i++)
  		reg_state[ctx_flexeu0 + i * 2 + 1] =
  			oa_config_flex_reg(stream->oa_config, flex_regs[i]);
@@ -2224,34 +2216,49 @@ static int gen8_configure_context(struct i915_gem_context *ctx,
  	return err;
  }
-static int gen12_emit_oar_config(struct intel_context *ce, bool enable)
+static int gen12_configure_oar_context(struct i915_perf_stream *stream, bool enable)
  {
-	struct i915_request *rq;
-	u32 *cs;
-	int err = 0;
-
-	rq = i915_request_create(ce);
-	if (IS_ERR(rq))
-		return PTR_ERR(rq);
+	int err;
+	struct intel_context *ce = stream->pinned_ctx;
+	struct flex regs_context[] = {
+		{
+			GEN8_OACTXCONTROL,
+			stream->perf->ctx_oactxctrl_offset + 1,
+			enable ? GEN8_OA_COUNTER_RESUME : 0,
+		},
+	};


When do we configure the Flex registers?


+	struct flex regs_lri[] = {
+		{
+			GEN12_OAR_OACONTROL,
+		},
+		{
+			RING_CONTEXT_CONTROL(ce->engine->mmio_base),
+		},
+	};
+	u32 format = stream->oa_buffer.format;
- cs = intel_ring_begin(rq, 4);
-	if (IS_ERR(cs)) {
-		err = PTR_ERR(cs);
-		goto out;
-	}
+	regs_lri[0].value =
+		(format << GEN12_OAR_OACONTROL_COUNTER_FORMAT_SHIFT) |
+		(enable ? GEN12_OAR_OACONTROL_COUNTER_ENABLE : 0);
- *cs++ = MI_LOAD_REGISTER_IMM(1);
-	*cs++ = i915_mmio_reg_offset(RING_CONTEXT_CONTROL(ce->engine->mmio_base));
-	*cs++ = _MASKED_FIELD(GEN12_CTX_CTRL_OAR_CONTEXT_ENABLE,
-			      enable ? GEN12_CTX_CTRL_OAR_CONTEXT_ENABLE : 0);
-	*cs++ = MI_NOOP;
+	regs_lri[1].value =
+		_MASKED_FIELD(GEN12_CTX_CTRL_OAR_CONTEXT_ENABLE,
+			      enable ?
+			      GEN12_CTX_CTRL_OAR_CONTEXT_ENABLE :
+			      0);


Can't we put those values in the array above?


- intel_ring_advance(rq, cs);
+	/* Modify the context image of pinned context with regs_context*/
+	err = intel_context_lock_pinned(ce);
+	if (err)
+		return err;
-out:
-	i915_request_add(rq);
+	err = gen8_modify_context(ce, regs_context, ARRAY_SIZE(regs_context));
+	intel_context_unlock_pinned(ce);
+	if (err)
+		return err;
- return err;
+	/* Apply regs_lri using LRI with pinned context */
+	return gen8_modify_self(ce, regs_lri, ARRAY_SIZE(regs_lri));
  }
/*
@@ -2277,53 +2284,16 @@ static int gen12_emit_oar_config(struct intel_context *ce, bool enable)
   *   per-context OA state.
   *
   * Note: it's only the RCS/Render context that has any OA state.
+ * Note: the first flex register passed must always be R_PWR_CLK_STATE
   */
-static int lrc_configure_all_contexts(struct i915_perf_stream *stream,
-				      const struct i915_oa_config *oa_config)
+static int oa_configure_all_contexts(struct i915_perf_stream *stream,
+				     struct flex *regs,
+				     size_t num_regs)
  {
  	struct drm_i915_private *i915 = stream->perf->i915;
-	/* The MMIO offsets for Flex EU registers aren't contiguous */
-	const u32 ctx_flexeu0 = stream->perf->ctx_flexeu0_offset;
-#define ctx_flexeuN(N) (ctx_flexeu0 + 2 * (N) + 1)
-	struct flex regs[] = {
-		{
-			GEN8_R_PWR_CLK_STATE,
-			CTX_R_PWR_CLK_STATE,
-		},
-		{
-			IS_GEN(i915, 12) ?
-			GEN12_OAR_OACONTROL : GEN8_OACTXCONTROL,
-			stream->perf->ctx_oactxctrl_offset + 1,
-		},
-		{ EU_PERF_CNTL0, ctx_flexeuN(0) },
-		{ EU_PERF_CNTL1, ctx_flexeuN(1) },
-		{ EU_PERF_CNTL2, ctx_flexeuN(2) },
-		{ EU_PERF_CNTL3, ctx_flexeuN(3) },
-		{ EU_PERF_CNTL4, ctx_flexeuN(4) },
-		{ EU_PERF_CNTL5, ctx_flexeuN(5) },
-		{ EU_PERF_CNTL6, ctx_flexeuN(6) },
-	};
-#undef ctx_flexeuN
  	struct intel_engine_cs *engine;
  	struct i915_gem_context *ctx, *cn;
-	size_t array_size = IS_GEN(i915, 12) ? 2 : ARRAY_SIZE(regs);
-	int i, err;
-
-	if (IS_GEN(i915, 12)) {
-		u32 format = stream->oa_buffer.format;
-
-		regs[1].value =
-			(format << GEN12_OAR_OACONTROL_COUNTER_FORMAT_SHIFT) |
-			(oa_config ? GEN12_OAR_OACONTROL_COUNTER_ENABLE : 0);
-	} else {
-		regs[1].value =
-			(stream->period_exponent << GEN8_OA_TIMER_PERIOD_SHIFT) |
-			(stream->periodic ? GEN8_OA_TIMER_ENABLE : 0) |
-			GEN8_OA_COUNTER_RESUME;
-	}
-
-	for (i = 2; !!ctx_flexeu0 && i < array_size; i++)
-		regs[i].value = oa_config_flex_reg(oa_config, regs[i].reg);
+	int err;
lockdep_assert_held(&stream->perf->lock); @@ -2353,7 +2323,7 @@ static int lrc_configure_all_contexts(struct i915_perf_stream *stream, spin_unlock(&i915->gem.contexts.lock); - err = gen8_configure_context(ctx, regs, array_size);
+		err = gen8_configure_context(ctx, regs, num_regs);
  		if (err) {
  			i915_gem_context_put(ctx);
  			return err;
@@ -2378,7 +2348,7 @@ static int lrc_configure_all_contexts(struct i915_perf_stream *stream,
regs[0].value = intel_sseu_make_rpcs(i915, &ce->sseu); - err = gen8_modify_self(ce, regs, array_size);
+		err = gen8_modify_self(ce, regs, num_regs);
  		if (err)
  			return err;
  	}
@@ -2386,6 +2356,56 @@ static int lrc_configure_all_contexts(struct i915_perf_stream *stream,
  	return 0;
  }
+static int gen12_configure_all_contexts(struct i915_perf_stream *stream,
+					const struct i915_oa_config *oa_config)
+{
+	struct flex regs[] = {
+		{
+			GEN8_R_PWR_CLK_STATE,
+			CTX_R_PWR_CLK_STATE,
+		},
+	};
+
+	return oa_configure_all_contexts(stream, regs, ARRAY_SIZE(regs));
+}
+
+static int lrc_configure_all_contexts(struct i915_perf_stream *stream,
+				      const struct i915_oa_config *oa_config)
+{
+	/* The MMIO offsets for Flex EU registers aren't contiguous */
+	const u32 ctx_flexeu0 = stream->perf->ctx_flexeu0_offset;
+#define ctx_flexeuN(N) (ctx_flexeu0 + 2 * (N) + 1)
+	struct flex regs[] = {
+		{
+			GEN8_R_PWR_CLK_STATE,
+			CTX_R_PWR_CLK_STATE,
+		},
+		{
+			GEN8_OACTXCONTROL,
+			stream->perf->ctx_oactxctrl_offset + 1,
+		},
+		{ EU_PERF_CNTL0, ctx_flexeuN(0) },
+		{ EU_PERF_CNTL1, ctx_flexeuN(1) },
+		{ EU_PERF_CNTL2, ctx_flexeuN(2) },
+		{ EU_PERF_CNTL3, ctx_flexeuN(3) },
+		{ EU_PERF_CNTL4, ctx_flexeuN(4) },
+		{ EU_PERF_CNTL5, ctx_flexeuN(5) },
+		{ EU_PERF_CNTL6, ctx_flexeuN(6) },
+	};
+#undef ctx_flexeuN
+	int i;
+
+	regs[1].value =
+		(stream->period_exponent << GEN8_OA_TIMER_PERIOD_SHIFT) |
+		(stream->periodic ? GEN8_OA_TIMER_ENABLE : 0) |
+		GEN8_OA_COUNTER_RESUME;
+
+	for (i = 2; i < ARRAY_SIZE(regs); i++)
+		regs[i].value = oa_config_flex_reg(oa_config, regs[i].reg);
+
+	return oa_configure_all_contexts(stream, regs, ARRAY_SIZE(regs));
+}
+
  static int gen8_enable_metric_set(struct i915_perf_stream *stream)
  {
  	struct intel_uncore *uncore = stream->uncore;
@@ -2469,7 +2489,7 @@ static int gen12_enable_metric_set(struct i915_perf_stream *stream)
  	 * to make sure all slices/subslices are ON before writing to NOA
  	 * registers.
  	 */
-	ret = lrc_configure_all_contexts(stream, oa_config);
+	ret = gen12_configure_all_contexts(stream, oa_config);
  	if (ret)
  		return ret;
@@ -2479,8 +2499,7 @@ static int gen12_enable_metric_set(struct i915_perf_stream *stream)
  	 * requested this.
  	 */
  	if (stream->ctx) {
-		ret = gen12_emit_oar_config(stream->pinned_ctx,
-					    oa_config != NULL);
+		ret = gen12_configure_oar_context(stream, oa_config != NULL);


I think you can assume oa_config is going to be != NULL in the enable_metric_set vfunc.


  		if (ret)
  			return ret;
  	}
@@ -2514,11 +2533,11 @@ static void gen12_disable_metric_set(struct i915_perf_stream *stream)
  	struct intel_uncore *uncore = stream->uncore;
/* Reset all contexts' slices/subslices configurations. */
-	lrc_configure_all_contexts(stream, NULL);
+	gen12_configure_all_contexts(stream, NULL);
/* disable the context save/restore or OAR counters */
  	if (stream->ctx)
-		gen12_emit_oar_config(stream->pinned_ctx, false);
+		gen12_configure_oar_context(stream, false);
/* Make sure we disable noa to save power. */
  	intel_uncore_rmw(uncore, RPM_CONFIG1, GEN10_GT_NOA_ENABLE, 0);
@@ -2860,7 +2879,11 @@ void i915_oa_init_reg_state(const struct intel_context *ce,
  		return;
stream = engine->i915->perf.exclusive_stream;
-	if (stream)
+	/*
+	 * For gen12, only CTX_R_PWR_CLK_STATE needs update, but the caller
+	 * is already doing that, so nothing to be done for gen12 here.
+	 */
+	if (stream && INTEL_GEN(stream->perf->i915) < 12)
  		gen8_update_reg_state_unlocked(ce, stream);
  }


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