[PATCH v7 2/3] drm/i915: set optimum eu/slice/sub-slice configuration based on load type

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This patch will select optimum eu/slice/sub-slice configuration based on
type of load (low, medium, high) as input.
Based on our readings and experiments we have predefined set of optimum
configuration for each platform(CHT, KBL).
i915_gem_context_set_load_type will select optimum configuration from
pre-defined optimum configuration table(opt_config).

It also introduce flag update_render_config which can set by any governor.

v2:
 * Move static optimum_config to device init time.
 * Rename function to appropriate name, fix data types and patch ordering.
 * Rename prev_load_type to pending_load_type. (Tvrtko Ursulin)

v3:
 * Add safe guard check in i915_gem_context_set_load_type.
 * Rename struct from optimum_config to i915_sseu_optimum_config to
   avoid namespace clashes.
 * Reduces memcpy for space efficient.
 * Rebase.
 * Improved commit message. (Tvrtko Ursulin)

v4:
 * Move optimum config table to file scope. (Tvrtko Ursulin)

v5:
 * Adds optimal table of slice/sub-slice/EU for Gen 9 GT1.
 * Rebase.

v6:
 * Rebase.
 * Fix warnings.

v7:
 * Fix return conditions.
 * Remove i915_gem_context_set_load_type and move logic to
   __execlists_update_reg_state. (Tvrtko Ursulin)

Cc: Vipin Anand <vipin.anand@xxxxxxxxx>
Signed-off-by: Ankit Navik <ankit.p.navik@xxxxxxxxx>
---
 drivers/gpu/drm/i915/gem/i915_gem_context.c       |  3 +
 drivers/gpu/drm/i915/gem/i915_gem_context_types.h | 32 +++++++++++
 drivers/gpu/drm/i915/gt/intel_context_sseu.c      |  2 +
 drivers/gpu/drm/i915/gt/intel_context_types.h     |  2 +
 drivers/gpu/drm/i915/gt/intel_lrc.c               | 70 ++++++++++++++++++++++-
 drivers/gpu/drm/i915/i915_drv.h                   |  5 ++
 drivers/gpu/drm/i915/intel_device_info.c          | 55 +++++++++++++++++-
 7 files changed, 165 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index d0ff999429ff..3aad45b0ba5a 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -880,6 +880,9 @@ i915_gem_create_context(struct drm_i915_private *i915, unsigned int flags)
 
 	trace_i915_context_create(ctx);
 	atomic_set(&ctx->req_cnt, 0);
+	ctx->slice_cnt = hweight8(RUNTIME_INFO(i915)->sseu.slice_mask);
+	ctx->subslice_cnt = hweight8(RUNTIME_INFO(i915)->sseu.subslice_mask[0]);
+	ctx->eu_cnt = RUNTIME_INFO(i915)->sseu.eu_per_subslice;
 
 	return ctx;
 }
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
index a9ba13f8865e..1af1acd73794 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
@@ -46,6 +46,19 @@ struct i915_gem_engines_iter {
 	const struct i915_gem_engines *engines;
 };
 
+enum gem_load_type {
+	LOAD_TYPE_LOW,
+	LOAD_TYPE_MEDIUM,
+	LOAD_TYPE_HIGH,
+	LOAD_TYPE_LAST
+};
+
+struct i915_sseu_optimum_config {
+	u8 slice;
+	u8 subslice;
+	u8 eu;
+};
+
 /**
  * struct i915_gem_context - client state
  *
@@ -155,6 +168,25 @@ struct i915_gem_context {
 	 */
 	atomic_t active_count;
 
+	/** slice_cnt: used to set the # of slices to be enabled. */
+	u8 slice_cnt;
+
+	/** subslice_cnt: used to set the # of subslices to be enabled. */
+	u8 subslice_cnt;
+
+	/** eu_cnt: used to set the # of eu to be enabled. */
+	u8 eu_cnt;
+
+	/** load_type: The designated load_type (high/medium/low) for a given
+	 * number of pending commands in the command queue.
+	 */
+	enum gem_load_type load_type;
+
+	/** pending_load_type: The earlier load type that the GPU was configured
+	 * for (high/medium/low).
+	 */
+	enum gem_load_type pending_load_type;
+
 	/**
 	 * @hang_timestamp: The last time(s) this context caused a GPU hang
 	 */
diff --git a/drivers/gpu/drm/i915/gt/intel_context_sseu.c b/drivers/gpu/drm/i915/gt/intel_context_sseu.c
index 57a30956c922..4f51bfb9690c 100644
--- a/drivers/gpu/drm/i915/gt/intel_context_sseu.c
+++ b/drivers/gpu/drm/i915/gt/intel_context_sseu.c
@@ -84,6 +84,8 @@ intel_context_reconfigure_sseu(struct intel_context *ce,
 	if (ret)
 		return ret;
 
+	ce->user_sseu = true;
+
 	/* Nothing to do if unmodified. */
 	if (!memcmp(&ce->sseu, &sseu, sizeof(sseu)))
 		goto unlock;
diff --git a/drivers/gpu/drm/i915/gt/intel_context_types.h b/drivers/gpu/drm/i915/gt/intel_context_types.h
index 0f3b68b95c56..fd5811110026 100644
--- a/drivers/gpu/drm/i915/gt/intel_context_types.h
+++ b/drivers/gpu/drm/i915/gt/intel_context_types.h
@@ -93,6 +93,8 @@ struct intel_context {
 
 	const struct intel_context_ops *ops;
 
+	bool user_sseu;
+
 	/** sseu: Control eu/slice partitioning */
 	struct intel_sseu sseu;
 };
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index ccfebebb0071..7c5f05886278 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -177,6 +177,14 @@
 /* Typical size of the average request (2 pipecontrols and a MI_BB) */
 #define EXECLISTS_REQUEST_SIZE 64 /* bytes */
 
+/*
+ * Anything above threshold is considered as HIGH load, less is considered
+ * as LOW load and equal is considered as MEDIUM load.
+ *
+ * The threshold value of three active requests pending.
+ */
+#define PENDING_THRESHOLD_MEDIUM 3
+
 struct virtual_engine {
 	struct intel_engine_cs base;
 	struct intel_context context;
@@ -3002,6 +3010,36 @@ static void execlists_context_unpin(struct intel_context *ce)
 	i915_gem_object_unpin_map(ce->state->obj);
 }
 
+static u32
+get_context_rpcs_config(struct i915_gem_context *ctx)
+{
+	u32 rpcs = 0;
+	struct drm_i915_private *dev_priv = ctx->i915;
+
+	if (INTEL_GEN(dev_priv) < 8)
+		return 0;
+
+	if (RUNTIME_INFO(dev_priv)->sseu.has_slice_pg) {
+		rpcs |= GEN8_RPCS_S_CNT_ENABLE;
+		rpcs |= ctx->slice_cnt << GEN8_RPCS_S_CNT_SHIFT;
+		rpcs |= GEN8_RPCS_ENABLE;
+	}
+
+	if (RUNTIME_INFO(dev_priv)->sseu.has_subslice_pg) {
+		rpcs |= GEN8_RPCS_SS_CNT_ENABLE;
+		rpcs |= ctx->subslice_cnt << GEN8_RPCS_SS_CNT_SHIFT;
+		rpcs |= GEN8_RPCS_ENABLE;
+	}
+
+	if (RUNTIME_INFO(dev_priv)->sseu.has_eu_pg) {
+		rpcs |= ctx->eu_cnt << GEN8_RPCS_EU_MIN_SHIFT;
+		rpcs |= ctx->eu_cnt << GEN8_RPCS_EU_MAX_SHIFT;
+		rpcs |= GEN8_RPCS_ENABLE;
+	}
+
+	return rpcs;
+}
+
 static void
 __execlists_update_reg_state(const struct intel_context *ce,
 			     const struct intel_engine_cs *engine,
@@ -3009,6 +3047,10 @@ __execlists_update_reg_state(const struct intel_context *ce,
 {
 	struct intel_ring *ring = ce->ring;
 	u32 *regs = ce->lrc_reg_state;
+	const struct i915_sseu_optimum_config *cfg;
+	struct i915_gem_context *ctx;
+	enum gem_load_type load_type;
+	u32 req_pending;
 
 	GEM_BUG_ON(!intel_ring_offset_valid(ring, head));
 	GEM_BUG_ON(!intel_ring_offset_valid(ring, ring->tail));
@@ -3018,10 +3060,31 @@ __execlists_update_reg_state(const struct intel_context *ce,
 	regs[CTX_RING_TAIL] = ring->tail;
 	regs[CTX_RING_CTL] = RING_CTL_SIZE(ring->size) | RING_VALID;
 
+	GEM_BUG_ON(ce->engine->class != RENDER_CLASS);
+	ctx = rcu_dereference_protected(ce->gem_context, true);
+
+	req_pending = atomic_read(&ctx->req_cnt);
+
+	if (req_pending > PENDING_THRESHOLD_MEDIUM)
+		load_type = LOAD_TYPE_HIGH;
+	else if (req_pending == PENDING_THRESHOLD_MEDIUM)
+		load_type = LOAD_TYPE_MEDIUM;
+	else
+		load_type = LOAD_TYPE_LOW;
+
+	cfg = &ctx->i915->opt_config[load_type];
+
 	/* RPCS */
 	if (engine->class == RENDER_CLASS) {
-		regs[CTX_R_PWR_CLK_STATE] =
-			intel_sseu_make_rpcs(engine->i915, &ce->sseu);
+
+		if (!ctx || !ctx->i915->predictive_load_enable
+			 || ce->user_sseu) {
+			regs[CTX_R_PWR_CLK_STATE] =
+				intel_sseu_make_rpcs(engine->i915, &ce->sseu);
+		} else {
+			regs[CTX_R_PWR_CLK_STATE] =
+				get_context_rpcs_config(ce->gem_context);
+		}
 
 		i915_oa_init_reg_state(ce, engine);
 	}
@@ -3046,6 +3109,9 @@ __execlists_context_pin(struct intel_context *ce,
 	ce->lrc_reg_state = vaddr + LRC_STATE_PN * PAGE_SIZE;
 	__execlists_update_reg_state(ce, engine, ce->ring->tail);
 
+	if (ce->gem_context->load_type != ce->gem_context->pending_load_type)
+		ce->gem_context->load_type = ce->gem_context->pending_load_type;
+
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 1f5b9a584f71..304d95aa4974 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -926,6 +926,11 @@ struct drm_i915_private {
 	/* protects panel power sequencer state */
 	struct mutex pps_mutex;
 
+	/* optimal slice/subslice/EU configration state */
+	struct i915_sseu_optimum_config *opt_config;
+
+	bool predictive_load_enable;
+
 	unsigned int fsb_freq, mem_freq, is_ddr3;
 	unsigned int skl_preferred_vco_freq;
 	unsigned int max_cdclk_freq;
diff --git a/drivers/gpu/drm/i915/intel_device_info.c b/drivers/gpu/drm/i915/intel_device_info.c
index d7fe12734db8..53d966a9097e 100644
--- a/drivers/gpu/drm/i915/intel_device_info.c
+++ b/drivers/gpu/drm/i915/intel_device_info.c
@@ -899,6 +899,34 @@ void intel_device_info_subplatform_init(struct drm_i915_private *i915)
 	RUNTIME_INFO(i915)->platform_mask[pi] |= mask;
 }
 
+/* static table of slice/subslice/EU for Cherryview */
+static const struct i915_sseu_optimum_config chv_config[LOAD_TYPE_LAST] = {
+	{1, 1, 4},	/* Low */
+	{1, 1, 6},	/* Medium */
+	{1, 2, 6}	/* High */
+};
+
+/* static table of slice/subslice/EU for GLK GT1 */
+static const struct i915_sseu_optimum_config glk_gt1_config[LOAD_TYPE_LAST] = {
+	{1, 2, 2},	/* Low */
+	{1, 2, 3},	/* Medium */
+	{1, 2, 6}	/* High */
+};
+
+/* static table of slice/subslice/EU for KBL GT2 */
+static const struct i915_sseu_optimum_config kbl_gt2_config[LOAD_TYPE_LAST] = {
+	{1, 3, 2},	/* Low */
+	{1, 3, 4},	/* Medium */
+	{1, 3, 8}	/* High */
+};
+
+/* static table of slice/subslice/EU for KBL GT3 */
+static const struct i915_sseu_optimum_config kbl_gt3_config[LOAD_TYPE_LAST] = {
+	{2, 3, 4},	/* Low */
+	{2, 3, 6},	/* Medium */
+	{2, 3, 8}	/* High */
+};
+
 /**
  * intel_device_info_runtime_init - initialize runtime info
  * @dev_priv: the i915 device
@@ -1027,12 +1055,35 @@ void intel_device_info_runtime_init(struct drm_i915_private *dev_priv)
 	/* Initialize slice/subslice/EU info */
 	if (IS_HASWELL(dev_priv))
 		hsw_sseu_info_init(dev_priv);
-	else if (IS_CHERRYVIEW(dev_priv))
+	else if (IS_CHERRYVIEW(dev_priv)) {
 		cherryview_sseu_info_init(dev_priv);
+		BUILD_BUG_ON(ARRAY_SIZE(chv_config) != LOAD_TYPE_LAST);
+		dev_priv->opt_config = chv_config;
+	}
 	else if (IS_BROADWELL(dev_priv))
 		bdw_sseu_info_init(dev_priv);
-	else if (IS_GEN(dev_priv, 9))
+	else if (IS_GEN(dev_priv, 9)) {
 		gen9_sseu_info_init(dev_priv);
+
+		switch (info->gt) {
+		default: /* fall through */
+		case 1:
+			BUILD_BUG_ON(ARRAY_SIZE(glk_gt1_config) !=
+						LOAD_TYPE_LAST);
+			dev_priv->opt_config = glk_gt1_config;
+		break;
+		case 2:
+			BUILD_BUG_ON(ARRAY_SIZE(kbl_gt2_config) !=
+						LOAD_TYPE_LAST);
+			dev_priv->opt_config = kbl_gt2_config;
+		break;
+		case 3:
+			BUILD_BUG_ON(ARRAY_SIZE(kbl_gt3_config) !=
+						LOAD_TYPE_LAST);
+			dev_priv->opt_config = kbl_gt3_config;
+		break;
+		}
+	}
 	else if (IS_GEN(dev_priv, 10))
 		gen10_sseu_info_init(dev_priv);
 	else if (IS_GEN(dev_priv, 11))
-- 
2.7.4

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