[PATCH v8 0/2] Refactor Gen11+ SAGV support

[PATCH v8 0/2] Refactor Gen11+ SAGV support

[Stanislav Lisovskiy]

For Gen11+ platforms BSpec suggests disabling specific
QGV points separately, depending on bandwidth limitations
and current display configuration. Thus it required adding
a new PCode request for disabling QGV points and some
refactoring of already existing SAGV code.
Also had to refactor intel_can_enable_sagv function,
as current seems to be outdated and using skl specific
workarounds, also not following BSpec for Gen11+.

Stanislav Lisovskiy (2):
  drm/i915: Refactor intel_can_enable_sagv
  drm/i915: Restrict qgv points which don't have enough bandwidth.

 drivers/gpu/drm/i915/display/intel_atomic.c   |  16 ++
 drivers/gpu/drm/i915/display/intel_atomic.h   |   3 +
 drivers/gpu/drm/i915/display/intel_bw.c       | 111 ++++++--
 drivers/gpu/drm/i915/display/intel_bw.h       |   2 +
 drivers/gpu/drm/i915/display/intel_display.c  |  57 +++-
 .../drm/i915/display/intel_display_types.h    |  11 +
 drivers/gpu/drm/i915/i915_drv.h               |   2 +
 drivers/gpu/drm/i915/i915_reg.h               |   5 +
 drivers/gpu/drm/i915/intel_pm.c               | 254 +++++++++++++++++-
 drivers/gpu/drm/i915/intel_sideband.c         |  27 +-
 10 files changed, 452 insertions(+), 36 deletions(-)

-- 
2.17.1

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[Intel-gfx] [PATCH v8 0/2] Refactor Gen11+ SAGV support

[Stanislav Lisovskiy]

For Gen11+ platforms BSpec suggests disabling specific
QGV points separately, depending on bandwidth limitations
and current display configuration. Thus it required adding
a new PCode request for disabling QGV points and some
refactoring of already existing SAGV code.
Also had to refactor intel_can_enable_sagv function,
as current seems to be outdated and using skl specific
workarounds, also not following BSpec for Gen11+.

Stanislav Lisovskiy (2):
  drm/i915: Refactor intel_can_enable_sagv
  drm/i915: Restrict qgv points which don't have enough bandwidth.

 drivers/gpu/drm/i915/display/intel_atomic.c   |  16 ++
 drivers/gpu/drm/i915/display/intel_atomic.h   |   3 +
 drivers/gpu/drm/i915/display/intel_bw.c       | 111 ++++++--
 drivers/gpu/drm/i915/display/intel_bw.h       |   2 +
 drivers/gpu/drm/i915/display/intel_display.c  |  57 +++-
 .../drm/i915/display/intel_display_types.h    |  11 +
 drivers/gpu/drm/i915/i915_drv.h               |   2 +
 drivers/gpu/drm/i915/i915_reg.h               |   5 +
 drivers/gpu/drm/i915/intel_pm.c               | 254 +++++++++++++++++-
 drivers/gpu/drm/i915/intel_sideband.c         |  27 +-
 10 files changed, 452 insertions(+), 36 deletions(-)

-- 
2.17.1

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[PATCH v8 1/2] drm/i915: Refactor intel_can_enable_sagv

[Stanislav Lisovskiy]

Currently intel_can_enable_sagv function contains
a mix of workarounds for different platforms
some of them are not valid for gens >= 11 already,
so lets split it into separate functions.

v2:
    - Rework watermark calculation algorithm to
      attempt to calculate Level 0 watermark
      with added sagv block time latency and
      check if it fits in DBuf in order to
      determine if SAGV can be enabled already
      at this stage, just as BSpec 49325 states.
      if that fails rollback to usual Level 0
      latency and disable SAGV.
    - Remove unneeded tabs(James Ausmus)

v3: Rebased the patch

v4: - Added back interlaced check for Gen12 and
      added separate function for TGL SAGV check
      (thanks to James Ausmus for spotting)
    - Removed unneeded gen check
    - Extracted Gen12 SAGV decision making code
      to a separate function from skl_compute_wm

Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Cc: Ville Syrjälä <ville.syrjala@intel.com>
Cc: James Ausmus <james.ausmus@intel.com>
---
 .../drm/i915/display/intel_display_types.h    |   8 +
 drivers/gpu/drm/i915/intel_pm.c               | 254 +++++++++++++++++-
 2 files changed, 254 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 8358152e403e..f09c80c96470 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -490,6 +490,13 @@ struct intel_atomic_state {
 	 */
 	u8 active_pipe_changes;
 
+	/*
+	 * For Gen12 only after calculating watermarks with
+	 * additional latency, we can determine if SAGV can be enabled
+	 * or not for that particular configuration.
+	 */
+	bool gen12_can_sagv;
+
 	u8 active_pipes;
 	/* minimum acceptable cdclk for each pipe */
 	int min_cdclk[I915_MAX_PIPES];
@@ -642,6 +649,7 @@ struct skl_plane_wm {
 	struct skl_wm_level wm[8];
 	struct skl_wm_level uv_wm[8];
 	struct skl_wm_level trans_wm;
+	struct skl_wm_level sagv_wm_l0;
 	bool is_planar;
 };
 
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 362234449087..b61eb6aaa89b 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3751,7 +3751,7 @@ intel_disable_sagv(struct drm_i915_private *dev_priv)
 	return 0;
 }
 
-bool intel_can_enable_sagv(struct intel_atomic_state *state)
+bool skl_can_enable_sagv(struct intel_atomic_state *state)
 {
 	struct drm_device *dev = state->base.dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
@@ -3817,6 +3817,95 @@ bool intel_can_enable_sagv(struct intel_atomic_state *state)
 	return true;
 }
 
+bool icl_can_enable_sagv(struct intel_atomic_state *state)
+{
+	struct drm_device *dev = state->base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	struct intel_crtc *crtc;
+	struct intel_crtc_state *new_crtc_state;
+	int level, latency;
+	int i;
+	int plane_id;
+
+	if (!intel_has_sagv(dev_priv))
+		return false;
+
+	/*
+	 * If there are no active CRTCs, no additional checks need be performed
+	 */
+	if (hweight8(state->active_pipes) == 0)
+		return true;
+
+	for_each_new_intel_crtc_in_state(state, crtc,
+					     new_crtc_state, i) {
+		unsigned int flags = crtc->base.state->adjusted_mode.flags;
+
+		if (flags & DRM_MODE_FLAG_INTERLACE)
+			return false;
+
+		if (!new_crtc_state->base.enable)
+			continue;
+
+		for_each_plane_id_on_crtc(crtc, plane_id) {
+			struct skl_plane_wm *wm =
+				&new_crtc_state->wm.skl.optimal.planes[plane_id];
+
+			/* Skip this plane if it's not enabled */
+			if (!wm->wm[0].plane_en)
+				continue;
+
+			/* Find the highest enabled wm level for this plane */
+			for (level = ilk_wm_max_level(dev_priv);
+			     !wm->wm[level].plane_en; --level) {
+			}
+
+			latency = dev_priv->wm.skl_latency[level];
+
+			/*
+			 * If any of the planes on this pipe don't enable
+			 * wm levels that incur memory latencies higher than
+			 * sagv_block_time_us we can't enable SAGV.
+			 */
+			if (latency < dev_priv->sagv_block_time_us)
+				return false;
+		}
+	}
+
+	return true;
+}
+
+bool tgl_can_enable_sagv(struct intel_atomic_state *state)
+{
+	struct intel_crtc *crtc;
+	struct intel_crtc_state *new_crtc_state;
+	int i;
+
+	if (!state->gen12_can_sagv)
+		return false;
+
+	for_each_new_intel_crtc_in_state(state, crtc,
+					     new_crtc_state, i) {
+		unsigned int flags = crtc->base.state->adjusted_mode.flags;
+
+		if (flags & DRM_MODE_FLAG_INTERLACE)
+			return false;
+	}
+	return true;
+}
+
+bool intel_can_enable_sagv(struct intel_atomic_state *state)
+{
+	struct drm_device *dev = state->base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+
+	if (INTEL_GEN(dev_priv) >= 12)
+		return tgl_can_enable_sagv(state);
+	else if (INTEL_GEN(dev_priv) == 11)
+		return icl_can_enable_sagv(state);
+
+	return skl_can_enable_sagv(state);
+}
+
 static u16 intel_get_ddb_size(struct drm_i915_private *dev_priv,
 			      const struct intel_crtc_state *crtc_state,
 			      const u64 total_data_rate,
@@ -3936,6 +4025,7 @@ static int skl_compute_wm_params(const struct intel_crtc_state *crtc_state,
 				 int color_plane);
 static void skl_compute_plane_wm(const struct intel_crtc_state *crtc_state,
 				 int level,
+				 u32 latency,
 				 const struct skl_wm_params *wp,
 				 const struct skl_wm_level *result_prev,
 				 struct skl_wm_level *result /* out */);
@@ -3958,7 +4048,9 @@ skl_cursor_allocation(const struct intel_crtc_state *crtc_state,
 	WARN_ON(ret);
 
 	for (level = 0; level <= max_level; level++) {
-		skl_compute_plane_wm(crtc_state, level, &wp, &wm, &wm);
+		u32 latency = dev_priv->wm.skl_latency[level];
+		skl_compute_plane_wm(crtc_state, level, latency, &wp, &wm, &wm);
+
 		if (wm.min_ddb_alloc == U16_MAX)
 			break;
 
@@ -4310,6 +4402,68 @@ icl_get_total_relative_data_rate(struct intel_crtc_state *crtc_state,
 	return total_data_rate;
 }
 
+static int
+tgl_check_pipe_fits_sagv_wm(struct intel_crtc_state *crtc_state,
+		      struct skl_ddb_allocation *ddb /* out */)
+{
+	struct drm_crtc *crtc = crtc_state->base.crtc;
+	struct drm_i915_private *dev_priv = to_i915(crtc->dev);
+	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+	struct skl_ddb_entry *alloc = &crtc_state->wm.skl.ddb;
+	u16 alloc_size;
+	u16 total[I915_MAX_PLANES] = {};
+	u64 total_data_rate;
+	enum plane_id plane_id;
+	int num_active;
+	u64 plane_data_rate[I915_MAX_PLANES] = {};
+	u32 blocks;
+
+	/*
+	 * No need to check gen here, we call this only for gen12
+	 */
+	total_data_rate =
+		icl_get_total_relative_data_rate(crtc_state,
+						 plane_data_rate);
+
+	skl_ddb_get_pipe_allocation_limits(dev_priv, crtc_state,
+					   total_data_rate,
+					   ddb, alloc, &num_active);
+	alloc_size = skl_ddb_entry_size(alloc);
+	if (alloc_size == 0)
+		return -ENOSPC;
+
+	/* Allocate fixed number of blocks for cursor. */
+	total[PLANE_CURSOR] = skl_cursor_allocation(crtc_state, num_active);
+	alloc_size -= total[PLANE_CURSOR];
+	crtc_state->wm.skl.plane_ddb_y[PLANE_CURSOR].start =
+		alloc->end - total[PLANE_CURSOR];
+	crtc_state->wm.skl.plane_ddb_y[PLANE_CURSOR].end = alloc->end;
+
+	/*
+	 * Do check if we can fit L0 + sagv_block_time and
+	 * disable SAGV if we can't.
+	 */
+	blocks = 0;
+	for_each_plane_id_on_crtc(intel_crtc, plane_id) {
+		const struct skl_plane_wm *wm =
+			&crtc_state->wm.skl.optimal.planes[plane_id];
+
+		if (plane_id == PLANE_CURSOR) {
+			if (WARN_ON(wm->sagv_wm_l0.min_ddb_alloc >
+				    total[PLANE_CURSOR])) {
+				blocks = U32_MAX;
+				break;
+			}
+			continue;
+		}
+
+		blocks += wm->sagv_wm_l0.min_ddb_alloc;
+		if (blocks > alloc_size)
+			return -ENOSPC;
+	}
+	return 0;
+}
+
 static int
 skl_allocate_pipe_ddb(struct intel_crtc_state *crtc_state,
 		      struct skl_ddb_allocation *ddb /* out */)
@@ -4739,12 +4893,12 @@ static bool skl_wm_has_lines(struct drm_i915_private *dev_priv, int level)
 
 static void skl_compute_plane_wm(const struct intel_crtc_state *crtc_state,
 				 int level,
+				 u32 latency,
 				 const struct skl_wm_params *wp,
 				 const struct skl_wm_level *result_prev,
 				 struct skl_wm_level *result /* out */)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
-	u32 latency = dev_priv->wm.skl_latency[level];
 	uint_fixed_16_16_t method1, method2;
 	uint_fixed_16_16_t selected_result;
 	u32 res_blocks, res_lines, min_ddb_alloc = 0;
@@ -4865,19 +5019,44 @@ static void skl_compute_plane_wm(const struct intel_crtc_state *crtc_state,
 static void
 skl_compute_wm_levels(const struct intel_crtc_state *crtc_state,
 		      const struct skl_wm_params *wm_params,
-		      struct skl_wm_level *levels)
+		      struct skl_plane_wm *plane_wm,
+		      bool yuv)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
 	int level, max_level = ilk_wm_max_level(dev_priv);
+	/*
+	 * Check which kind of plane is it and based on that calculate
+	 * correspondent WM levels.
+	 */
+	struct skl_wm_level *levels = yuv ? plane_wm->uv_wm : plane_wm->wm;
 	struct skl_wm_level *result_prev = &levels[0];
 
 	for (level = 0; level <= max_level; level++) {
 		struct skl_wm_level *result = &levels[level];
+		u32 latency = dev_priv->wm.skl_latency[level];
 
-		skl_compute_plane_wm(crtc_state, level, wm_params,
-				     result_prev, result);
+		skl_compute_plane_wm(crtc_state, level, latency,
+				     wm_params, result_prev, result);
 
 		result_prev = result;
+		if (level == 0) {
+			/*
+			 * For Gen12 if it is an L0 we need to also
+			 * consider sagv_block_time when calculating
+			 * L0 watermark - we will need that when making
+			 * a decision whether enable SAGV or not.
+			 * For older gens we agreed to copy L0 value for
+			 * compatibility.
+			 */
+			if ((INTEL_GEN(dev_priv) >= 12)) {
+				latency += dev_priv->sagv_block_time_us;
+				skl_compute_plane_wm(crtc_state, level, latency,
+				     wm_params, result_prev,
+				    &plane_wm->sagv_wm_l0);
+			} else
+				memcpy(&plane_wm->sagv_wm_l0, &levels[0],
+					sizeof(struct skl_wm_level));
+		}
 	}
 }
 
@@ -4971,7 +5150,7 @@ static int skl_build_plane_wm_single(struct intel_crtc_state *crtc_state,
 	if (ret)
 		return ret;
 
-	skl_compute_wm_levels(crtc_state, &wm_params, wm->wm);
+	skl_compute_wm_levels(crtc_state, &wm_params, wm, false);
 	skl_compute_transition_wm(crtc_state, &wm_params, wm);
 
 	return 0;
@@ -4993,7 +5172,7 @@ static int skl_build_plane_wm_uv(struct intel_crtc_state *crtc_state,
 	if (ret)
 		return ret;
 
-	skl_compute_wm_levels(crtc_state, &wm_params, wm->uv_wm);
+	skl_compute_wm_levels(crtc_state, &wm_params, wm, true);
 
 	return 0;
 }
@@ -5541,9 +5720,62 @@ static int skl_wm_add_affected_planes(struct intel_atomic_state *state,
 	return 0;
 }
 
+static void tgl_check_and_set_sagv(struct intel_atomic_state *state)
+{
+	struct drm_device *dev = state->base.dev;
+	const struct drm_i915_private *dev_priv = to_i915(dev);
+	struct intel_crtc *crtc;
+	struct intel_crtc_state *new_crtc_state;
+	struct intel_crtc_state *old_crtc_state;
+	struct skl_ddb_allocation *ddb = &state->wm_results.ddb;
+	int ret, i;
+
+	/*
+	 * Lets assume we can tolerate SAGV for now,
+	 * until watermark calculations prove the opposite
+	 * if any of the pipe planes in the state will
+	 * fail the requirements it will be assigned to false
+	 * in skl_compute_ddb.
+	 */
+	state->gen12_can_sagv = true;
+
+	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
+					    new_crtc_state, i) {
+		ret = tgl_check_pipe_fits_sagv_wm(new_crtc_state, ddb);
+		if (ret) {
+			state->gen12_can_sagv = false;
+			break;
+		}
+	}
+
+	if (state->gen12_can_sagv) {
+		/*
+		 * If we determined that we can actually enable SAGV, then
+		 * actually use those levels tgl_check_pipe_fits_sagv_wm
+		 * has already taken care of checking if L0 + sagv block time
+		 * fits into ddb.
+		 */
+		for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
+					    new_crtc_state, i) {
+			struct intel_plane *plane;
+			for_each_intel_plane_on_crtc(&dev_priv->drm, crtc, plane) {
+				enum plane_id plane_id = plane->id;
+				struct skl_plane_wm *plane_wm = \
+				    &new_crtc_state->wm.skl.optimal.planes[plane_id];
+				struct skl_wm_level *sagv_wm0 = &plane_wm->sagv_wm_l0;
+				struct skl_wm_level *l0_wm0 = &plane_wm->wm[0];
+
+				memcpy(l0_wm0, sagv_wm0, sizeof(struct skl_wm_level));
+			}
+		}
+	}
+}
+
 static int
 skl_compute_wm(struct intel_atomic_state *state)
 {
+	struct drm_device *dev = state->base.dev;
+	const struct drm_i915_private *dev_priv = to_i915(dev);
 	struct intel_crtc *crtc;
 	struct intel_crtc_state *new_crtc_state;
 	struct intel_crtc_state *old_crtc_state;
@@ -5553,6 +5785,9 @@ skl_compute_wm(struct intel_atomic_state *state)
 	/* Clear all dirty flags */
 	results->dirty_pipes = 0;
 
+	/* If we exit before check is done */
+	state->gen12_can_sagv = false;
+
 	ret = skl_ddb_add_affected_pipes(state);
 	if (ret)
 		return ret;
@@ -5579,6 +5814,9 @@ skl_compute_wm(struct intel_atomic_state *state)
 			results->dirty_pipes |= BIT(crtc->pipe);
 	}
 
+	if (INTEL_GEN(dev_priv) >= 12)
+		tgl_check_and_set_sagv(state);
+
 	ret = skl_compute_ddb(state);
 	if (ret)
 		return ret;
-- 
2.17.1

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[Intel-gfx] [PATCH v8 1/2] drm/i915: Refactor intel_can_enable_sagv

[Stanislav Lisovskiy]

Currently intel_can_enable_sagv function contains
a mix of workarounds for different platforms
some of them are not valid for gens >= 11 already,
so lets split it into separate functions.

v2:
    - Rework watermark calculation algorithm to
      attempt to calculate Level 0 watermark
      with added sagv block time latency and
      check if it fits in DBuf in order to
      determine if SAGV can be enabled already
      at this stage, just as BSpec 49325 states.
      if that fails rollback to usual Level 0
      latency and disable SAGV.
    - Remove unneeded tabs(James Ausmus)

v3: Rebased the patch

v4: - Added back interlaced check for Gen12 and
      added separate function for TGL SAGV check
      (thanks to James Ausmus for spotting)
    - Removed unneeded gen check
    - Extracted Gen12 SAGV decision making code
      to a separate function from skl_compute_wm

Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Cc: Ville Syrjälä <ville.syrjala@intel.com>
Cc: James Ausmus <james.ausmus@intel.com>
---
 .../drm/i915/display/intel_display_types.h    |   8 +
 drivers/gpu/drm/i915/intel_pm.c               | 254 +++++++++++++++++-
 2 files changed, 254 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index 8358152e403e..f09c80c96470 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -490,6 +490,13 @@ struct intel_atomic_state {
 	 */
 	u8 active_pipe_changes;
 
+	/*
+	 * For Gen12 only after calculating watermarks with
+	 * additional latency, we can determine if SAGV can be enabled
+	 * or not for that particular configuration.
+	 */
+	bool gen12_can_sagv;
+
 	u8 active_pipes;
 	/* minimum acceptable cdclk for each pipe */
 	int min_cdclk[I915_MAX_PIPES];
@@ -642,6 +649,7 @@ struct skl_plane_wm {
 	struct skl_wm_level wm[8];
 	struct skl_wm_level uv_wm[8];
 	struct skl_wm_level trans_wm;
+	struct skl_wm_level sagv_wm_l0;
 	bool is_planar;
 };
 
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 362234449087..b61eb6aaa89b 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3751,7 +3751,7 @@ intel_disable_sagv(struct drm_i915_private *dev_priv)
 	return 0;
 }
 
-bool intel_can_enable_sagv(struct intel_atomic_state *state)
+bool skl_can_enable_sagv(struct intel_atomic_state *state)
 {
 	struct drm_device *dev = state->base.dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
@@ -3817,6 +3817,95 @@ bool intel_can_enable_sagv(struct intel_atomic_state *state)
 	return true;
 }
 
+bool icl_can_enable_sagv(struct intel_atomic_state *state)
+{
+	struct drm_device *dev = state->base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	struct intel_crtc *crtc;
+	struct intel_crtc_state *new_crtc_state;
+	int level, latency;
+	int i;
+	int plane_id;
+
+	if (!intel_has_sagv(dev_priv))
+		return false;
+
+	/*
+	 * If there are no active CRTCs, no additional checks need be performed
+	 */
+	if (hweight8(state->active_pipes) == 0)
+		return true;
+
+	for_each_new_intel_crtc_in_state(state, crtc,
+					     new_crtc_state, i) {
+		unsigned int flags = crtc->base.state->adjusted_mode.flags;
+
+		if (flags & DRM_MODE_FLAG_INTERLACE)
+			return false;
+
+		if (!new_crtc_state->base.enable)
+			continue;
+
+		for_each_plane_id_on_crtc(crtc, plane_id) {
+			struct skl_plane_wm *wm =
+				&new_crtc_state->wm.skl.optimal.planes[plane_id];
+
+			/* Skip this plane if it's not enabled */
+			if (!wm->wm[0].plane_en)
+				continue;
+
+			/* Find the highest enabled wm level for this plane */
+			for (level = ilk_wm_max_level(dev_priv);
+			     !wm->wm[level].plane_en; --level) {
+			}
+
+			latency = dev_priv->wm.skl_latency[level];
+
+			/*
+			 * If any of the planes on this pipe don't enable
+			 * wm levels that incur memory latencies higher than
+			 * sagv_block_time_us we can't enable SAGV.
+			 */
+			if (latency < dev_priv->sagv_block_time_us)
+				return false;
+		}
+	}
+
+	return true;
+}
+
+bool tgl_can_enable_sagv(struct intel_atomic_state *state)
+{
+	struct intel_crtc *crtc;
+	struct intel_crtc_state *new_crtc_state;
+	int i;
+
+	if (!state->gen12_can_sagv)
+		return false;
+
+	for_each_new_intel_crtc_in_state(state, crtc,
+					     new_crtc_state, i) {
+		unsigned int flags = crtc->base.state->adjusted_mode.flags;
+
+		if (flags & DRM_MODE_FLAG_INTERLACE)
+			return false;
+	}
+	return true;
+}
+
+bool intel_can_enable_sagv(struct intel_atomic_state *state)
+{
+	struct drm_device *dev = state->base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+
+	if (INTEL_GEN(dev_priv) >= 12)
+		return tgl_can_enable_sagv(state);
+	else if (INTEL_GEN(dev_priv) == 11)
+		return icl_can_enable_sagv(state);
+
+	return skl_can_enable_sagv(state);
+}
+
 static u16 intel_get_ddb_size(struct drm_i915_private *dev_priv,
 			      const struct intel_crtc_state *crtc_state,
 			      const u64 total_data_rate,
@@ -3936,6 +4025,7 @@ static int skl_compute_wm_params(const struct intel_crtc_state *crtc_state,
 				 int color_plane);
 static void skl_compute_plane_wm(const struct intel_crtc_state *crtc_state,
 				 int level,
+				 u32 latency,
 				 const struct skl_wm_params *wp,
 				 const struct skl_wm_level *result_prev,
 				 struct skl_wm_level *result /* out */);
@@ -3958,7 +4048,9 @@ skl_cursor_allocation(const struct intel_crtc_state *crtc_state,
 	WARN_ON(ret);
 
 	for (level = 0; level <= max_level; level++) {
-		skl_compute_plane_wm(crtc_state, level, &wp, &wm, &wm);
+		u32 latency = dev_priv->wm.skl_latency[level];
+		skl_compute_plane_wm(crtc_state, level, latency, &wp, &wm, &wm);
+
 		if (wm.min_ddb_alloc == U16_MAX)
 			break;
 
@@ -4310,6 +4402,68 @@ icl_get_total_relative_data_rate(struct intel_crtc_state *crtc_state,
 	return total_data_rate;
 }
 
+static int
+tgl_check_pipe_fits_sagv_wm(struct intel_crtc_state *crtc_state,
+		      struct skl_ddb_allocation *ddb /* out */)
+{
+	struct drm_crtc *crtc = crtc_state->base.crtc;
+	struct drm_i915_private *dev_priv = to_i915(crtc->dev);
+	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+	struct skl_ddb_entry *alloc = &crtc_state->wm.skl.ddb;
+	u16 alloc_size;
+	u16 total[I915_MAX_PLANES] = {};
+	u64 total_data_rate;
+	enum plane_id plane_id;
+	int num_active;
+	u64 plane_data_rate[I915_MAX_PLANES] = {};
+	u32 blocks;
+
+	/*
+	 * No need to check gen here, we call this only for gen12
+	 */
+	total_data_rate =
+		icl_get_total_relative_data_rate(crtc_state,
+						 plane_data_rate);
+
+	skl_ddb_get_pipe_allocation_limits(dev_priv, crtc_state,
+					   total_data_rate,
+					   ddb, alloc, &num_active);
+	alloc_size = skl_ddb_entry_size(alloc);
+	if (alloc_size == 0)
+		return -ENOSPC;
+
+	/* Allocate fixed number of blocks for cursor. */
+	total[PLANE_CURSOR] = skl_cursor_allocation(crtc_state, num_active);
+	alloc_size -= total[PLANE_CURSOR];
+	crtc_state->wm.skl.plane_ddb_y[PLANE_CURSOR].start =
+		alloc->end - total[PLANE_CURSOR];
+	crtc_state->wm.skl.plane_ddb_y[PLANE_CURSOR].end = alloc->end;
+
+	/*
+	 * Do check if we can fit L0 + sagv_block_time and
+	 * disable SAGV if we can't.
+	 */
+	blocks = 0;
+	for_each_plane_id_on_crtc(intel_crtc, plane_id) {
+		const struct skl_plane_wm *wm =
+			&crtc_state->wm.skl.optimal.planes[plane_id];
+
+		if (plane_id == PLANE_CURSOR) {
+			if (WARN_ON(wm->sagv_wm_l0.min_ddb_alloc >
+				    total[PLANE_CURSOR])) {
+				blocks = U32_MAX;
+				break;
+			}
+			continue;
+		}
+
+		blocks += wm->sagv_wm_l0.min_ddb_alloc;
+		if (blocks > alloc_size)
+			return -ENOSPC;
+	}
+	return 0;
+}
+
 static int
 skl_allocate_pipe_ddb(struct intel_crtc_state *crtc_state,
 		      struct skl_ddb_allocation *ddb /* out */)
@@ -4739,12 +4893,12 @@ static bool skl_wm_has_lines(struct drm_i915_private *dev_priv, int level)
 
 static void skl_compute_plane_wm(const struct intel_crtc_state *crtc_state,
 				 int level,
+				 u32 latency,
 				 const struct skl_wm_params *wp,
 				 const struct skl_wm_level *result_prev,
 				 struct skl_wm_level *result /* out */)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
-	u32 latency = dev_priv->wm.skl_latency[level];
 	uint_fixed_16_16_t method1, method2;
 	uint_fixed_16_16_t selected_result;
 	u32 res_blocks, res_lines, min_ddb_alloc = 0;
@@ -4865,19 +5019,44 @@ static void skl_compute_plane_wm(const struct intel_crtc_state *crtc_state,
 static void
 skl_compute_wm_levels(const struct intel_crtc_state *crtc_state,
 		      const struct skl_wm_params *wm_params,
-		      struct skl_wm_level *levels)
+		      struct skl_plane_wm *plane_wm,
+		      bool yuv)
 {
 	struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
 	int level, max_level = ilk_wm_max_level(dev_priv);
+	/*
+	 * Check which kind of plane is it and based on that calculate
+	 * correspondent WM levels.
+	 */
+	struct skl_wm_level *levels = yuv ? plane_wm->uv_wm : plane_wm->wm;
 	struct skl_wm_level *result_prev = &levels[0];
 
 	for (level = 0; level <= max_level; level++) {
 		struct skl_wm_level *result = &levels[level];
+		u32 latency = dev_priv->wm.skl_latency[level];
 
-		skl_compute_plane_wm(crtc_state, level, wm_params,
-				     result_prev, result);
+		skl_compute_plane_wm(crtc_state, level, latency,
+				     wm_params, result_prev, result);
 
 		result_prev = result;
+		if (level == 0) {
+			/*
+			 * For Gen12 if it is an L0 we need to also
+			 * consider sagv_block_time when calculating
+			 * L0 watermark - we will need that when making
+			 * a decision whether enable SAGV or not.
+			 * For older gens we agreed to copy L0 value for
+			 * compatibility.
+			 */
+			if ((INTEL_GEN(dev_priv) >= 12)) {
+				latency += dev_priv->sagv_block_time_us;
+				skl_compute_plane_wm(crtc_state, level, latency,
+				     wm_params, result_prev,
+				    &plane_wm->sagv_wm_l0);
+			} else
+				memcpy(&plane_wm->sagv_wm_l0, &levels[0],
+					sizeof(struct skl_wm_level));
+		}
 	}
 }
 
@@ -4971,7 +5150,7 @@ static int skl_build_plane_wm_single(struct intel_crtc_state *crtc_state,
 	if (ret)
 		return ret;
 
-	skl_compute_wm_levels(crtc_state, &wm_params, wm->wm);
+	skl_compute_wm_levels(crtc_state, &wm_params, wm, false);
 	skl_compute_transition_wm(crtc_state, &wm_params, wm);
 
 	return 0;
@@ -4993,7 +5172,7 @@ static int skl_build_plane_wm_uv(struct intel_crtc_state *crtc_state,
 	if (ret)
 		return ret;
 
-	skl_compute_wm_levels(crtc_state, &wm_params, wm->uv_wm);
+	skl_compute_wm_levels(crtc_state, &wm_params, wm, true);
 
 	return 0;
 }
@@ -5541,9 +5720,62 @@ static int skl_wm_add_affected_planes(struct intel_atomic_state *state,
 	return 0;
 }
 
+static void tgl_check_and_set_sagv(struct intel_atomic_state *state)
+{
+	struct drm_device *dev = state->base.dev;
+	const struct drm_i915_private *dev_priv = to_i915(dev);
+	struct intel_crtc *crtc;
+	struct intel_crtc_state *new_crtc_state;
+	struct intel_crtc_state *old_crtc_state;
+	struct skl_ddb_allocation *ddb = &state->wm_results.ddb;
+	int ret, i;
+
+	/*
+	 * Lets assume we can tolerate SAGV for now,
+	 * until watermark calculations prove the opposite
+	 * if any of the pipe planes in the state will
+	 * fail the requirements it will be assigned to false
+	 * in skl_compute_ddb.
+	 */
+	state->gen12_can_sagv = true;
+
+	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
+					    new_crtc_state, i) {
+		ret = tgl_check_pipe_fits_sagv_wm(new_crtc_state, ddb);
+		if (ret) {
+			state->gen12_can_sagv = false;
+			break;
+		}
+	}
+
+	if (state->gen12_can_sagv) {
+		/*
+		 * If we determined that we can actually enable SAGV, then
+		 * actually use those levels tgl_check_pipe_fits_sagv_wm
+		 * has already taken care of checking if L0 + sagv block time
+		 * fits into ddb.
+		 */
+		for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
+					    new_crtc_state, i) {
+			struct intel_plane *plane;
+			for_each_intel_plane_on_crtc(&dev_priv->drm, crtc, plane) {
+				enum plane_id plane_id = plane->id;
+				struct skl_plane_wm *plane_wm = \
+				    &new_crtc_state->wm.skl.optimal.planes[plane_id];
+				struct skl_wm_level *sagv_wm0 = &plane_wm->sagv_wm_l0;
+				struct skl_wm_level *l0_wm0 = &plane_wm->wm[0];
+
+				memcpy(l0_wm0, sagv_wm0, sizeof(struct skl_wm_level));
+			}
+		}
+	}
+}
+
 static int
 skl_compute_wm(struct intel_atomic_state *state)
 {
+	struct drm_device *dev = state->base.dev;
+	const struct drm_i915_private *dev_priv = to_i915(dev);
 	struct intel_crtc *crtc;
 	struct intel_crtc_state *new_crtc_state;
 	struct intel_crtc_state *old_crtc_state;
@@ -5553,6 +5785,9 @@ skl_compute_wm(struct intel_atomic_state *state)
 	/* Clear all dirty flags */
 	results->dirty_pipes = 0;
 
+	/* If we exit before check is done */
+	state->gen12_can_sagv = false;
+
 	ret = skl_ddb_add_affected_pipes(state);
 	if (ret)
 		return ret;
@@ -5579,6 +5814,9 @@ skl_compute_wm(struct intel_atomic_state *state)
 			results->dirty_pipes |= BIT(crtc->pipe);
 	}
 
+	if (INTEL_GEN(dev_priv) >= 12)
+		tgl_check_and_set_sagv(state);
+
 	ret = skl_compute_ddb(state);
 	if (ret)
 		return ret;
-- 
2.17.1

_______________________________________________
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Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [PATCH v8 1/2] drm/i915: Refactor intel_can_enable_sagv

[Ville Syrjälä]

On Fri, Oct 25, 2019 at 12:53:51PM +0300, Stanislav Lisovskiy wrote:
> Currently intel_can_enable_sagv function contains
> a mix of workarounds for different platforms
> some of them are not valid for gens >= 11 already,
> so lets split it into separate functions.
> 
> v2:
>     - Rework watermark calculation algorithm to
>       attempt to calculate Level 0 watermark
>       with added sagv block time latency and
>       check if it fits in DBuf in order to
>       determine if SAGV can be enabled already
>       at this stage, just as BSpec 49325 states.
>       if that fails rollback to usual Level 0
>       latency and disable SAGV.
>     - Remove unneeded tabs(James Ausmus)
> 
> v3: Rebased the patch
> 
> v4: - Added back interlaced check for Gen12 and
>       added separate function for TGL SAGV check
>       (thanks to James Ausmus for spotting)
>     - Removed unneeded gen check
>     - Extracted Gen12 SAGV decision making code
>       to a separate function from skl_compute_wm
> 
> Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
> Cc: Ville Syrjälä <ville.syrjala@intel.com>
> Cc: James Ausmus <james.ausmus@intel.com>
> ---
>  .../drm/i915/display/intel_display_types.h    |   8 +
>  drivers/gpu/drm/i915/intel_pm.c               | 254 +++++++++++++++++-
>  2 files changed, 254 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
> index 8358152e403e..f09c80c96470 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -490,6 +490,13 @@ struct intel_atomic_state {
>  	 */
>  	u8 active_pipe_changes;
>  
> +	/*
> +	 * For Gen12 only after calculating watermarks with
> +	 * additional latency, we can determine if SAGV can be enabled
> +	 * or not for that particular configuration.
> +	 */
> +	bool gen12_can_sagv;
> +
>  	u8 active_pipes;
>  	/* minimum acceptable cdclk for each pipe */
>  	int min_cdclk[I915_MAX_PIPES];
> @@ -642,6 +649,7 @@ struct skl_plane_wm {
>  	struct skl_wm_level wm[8];
>  	struct skl_wm_level uv_wm[8];
>  	struct skl_wm_level trans_wm;
> +	struct skl_wm_level sagv_wm_l0;

sagv_wm0 (or maybe even just sagv_wm) would be a bit less ugly
name I think.

>  	bool is_planar;
>  };
>  
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 362234449087..b61eb6aaa89b 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -3751,7 +3751,7 @@ intel_disable_sagv(struct drm_i915_private *dev_priv)
>  	return 0;
>  }
>  
> -bool intel_can_enable_sagv(struct intel_atomic_state *state)
> +bool skl_can_enable_sagv(struct intel_atomic_state *state)
>  {
>  	struct drm_device *dev = state->base.dev;
>  	struct drm_i915_private *dev_priv = to_i915(dev);
> @@ -3817,6 +3817,95 @@ bool intel_can_enable_sagv(struct intel_atomic_state *state)
>  	return true;
>  }
>  
> +bool icl_can_enable_sagv(struct intel_atomic_state *state)
> +{
> +	struct drm_device *dev = state->base.dev;
> +	struct drm_i915_private *dev_priv = to_i915(dev);
> +	struct intel_crtc *crtc;
> +	struct intel_crtc_state *new_crtc_state;
> +	int level, latency;
> +	int i;
> +	int plane_id;
> +
> +	if (!intel_has_sagv(dev_priv))
> +		return false;
> +
> +	/*
> +	 * If there are no active CRTCs, no additional checks need be performed
> +	 */
> +	if (hweight8(state->active_pipes) == 0)
> +		return true;
> +
> +	for_each_new_intel_crtc_in_state(state, crtc,
> +					     new_crtc_state, i) {
> +		unsigned int flags = crtc->base.state->adjusted_mode.flags;
> +
> +		if (flags & DRM_MODE_FLAG_INTERLACE)
> +			return false;
> +
> +		if (!new_crtc_state->base.enable)
> +			continue;

Do we use active or enable elsewhere to decide whether to compute wms
for a pipe? Should be consistent here so we don't get into some wonky
state where we didn't compute normal wms but are computing the sagv wm.

> +
> +		for_each_plane_id_on_crtc(crtc, plane_id) {
> +			struct skl_plane_wm *wm =
> +				&new_crtc_state->wm.skl.optimal.planes[plane_id];
> +
> +			/* Skip this plane if it's not enabled */
> +			if (!wm->wm[0].plane_en)
> +				continue;
> +
> +			/* Find the highest enabled wm level for this plane */
> +			for (level = ilk_wm_max_level(dev_priv);
> +			     !wm->wm[level].plane_en; --level) {
> +			}
> +
> +			latency = dev_priv->wm.skl_latency[level];
> +
> +			/*
> +			 * If any of the planes on this pipe don't enable
> +			 * wm levels that incur memory latencies higher than
> +			 * sagv_block_time_us we can't enable SAGV.
> +			 */
> +			if (latency < dev_priv->sagv_block_time_us)
> +				return false;
> +		}
> +	}
> +
> +	return true;
> +}
> +
> +bool tgl_can_enable_sagv(struct intel_atomic_state *state)
> +{
> +	struct intel_crtc *crtc;
> +	struct intel_crtc_state *new_crtc_state;
> +	int i;
> +
> +	if (!state->gen12_can_sagv)
> +		return false;
> +
> +	for_each_new_intel_crtc_in_state(state, crtc,
> +					     new_crtc_state, i) {
> +		unsigned int flags = crtc->base.state->adjusted_mode.flags;
> +
> +		if (flags & DRM_MODE_FLAG_INTERLACE)
> +			return false;
> +	}
> +	return true;
> +}
> +
> +bool intel_can_enable_sagv(struct intel_atomic_state *state)
> +{
> +	struct drm_device *dev = state->base.dev;
> +	struct drm_i915_private *dev_priv = to_i915(dev);
> +
> +	if (INTEL_GEN(dev_priv) >= 12)
> +		return tgl_can_enable_sagv(state);
> +	else if (INTEL_GEN(dev_priv) == 11)
> +		return icl_can_enable_sagv(state);
> +
> +	return skl_can_enable_sagv(state);

Why do we have three separate code paths now? I believe there should be
just two.

Also if you go to the trouble of adding dev_priv->..can_sagv just make
it work for all platforms.

> +}
> +
>  static u16 intel_get_ddb_size(struct drm_i915_private *dev_priv,
>  			      const struct intel_crtc_state *crtc_state,
>  			      const u64 total_data_rate,
> @@ -3936,6 +4025,7 @@ static int skl_compute_wm_params(const struct intel_crtc_state *crtc_state,
>  				 int color_plane);
>  static void skl_compute_plane_wm(const struct intel_crtc_state *crtc_state,
>  				 int level,
> +				 u32 latency,
>  				 const struct skl_wm_params *wp,
>  				 const struct skl_wm_level *result_prev,
>  				 struct skl_wm_level *result /* out */);
> @@ -3958,7 +4048,9 @@ skl_cursor_allocation(const struct intel_crtc_state *crtc_state,
>  	WARN_ON(ret);
>  
>  	for (level = 0; level <= max_level; level++) {
> -		skl_compute_plane_wm(crtc_state, level, &wp, &wm, &wm);
> +		u32 latency = dev_priv->wm.skl_latency[level];
> +		skl_compute_plane_wm(crtc_state, level, latency, &wp, &wm, &wm);
> +
>  		if (wm.min_ddb_alloc == U16_MAX)
>  			break;
>  
> @@ -4310,6 +4402,68 @@ icl_get_total_relative_data_rate(struct intel_crtc_state *crtc_state,
>  	return total_data_rate;
>  }
>  
> +static int
> +tgl_check_pipe_fits_sagv_wm(struct intel_crtc_state *crtc_state,
> +		      struct skl_ddb_allocation *ddb /* out */)
> +{
> +	struct drm_crtc *crtc = crtc_state->base.crtc;
> +	struct drm_i915_private *dev_priv = to_i915(crtc->dev);
> +	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> +	struct skl_ddb_entry *alloc = &crtc_state->wm.skl.ddb;
> +	u16 alloc_size;
> +	u16 total[I915_MAX_PLANES] = {};
> +	u64 total_data_rate;
> +	enum plane_id plane_id;
> +	int num_active;
> +	u64 plane_data_rate[I915_MAX_PLANES] = {};
> +	u32 blocks;
> +
> +	/*
> +	 * No need to check gen here, we call this only for gen12
> +	 */
> +	total_data_rate =
> +		icl_get_total_relative_data_rate(crtc_state,
> +						 plane_data_rate);
> +
> +	skl_ddb_get_pipe_allocation_limits(dev_priv, crtc_state,
> +					   total_data_rate,
> +					   ddb, alloc, &num_active);
> +	alloc_size = skl_ddb_entry_size(alloc);
> +	if (alloc_size == 0)
> +		return -ENOSPC;
> +
> +	/* Allocate fixed number of blocks for cursor. */
> +	total[PLANE_CURSOR] = skl_cursor_allocation(crtc_state, num_active);
> +	alloc_size -= total[PLANE_CURSOR];
> +	crtc_state->wm.skl.plane_ddb_y[PLANE_CURSOR].start =
> +		alloc->end - total[PLANE_CURSOR];
> +	crtc_state->wm.skl.plane_ddb_y[PLANE_CURSOR].end = alloc->end;
> +
> +	/*
> +	 * Do check if we can fit L0 + sagv_block_time and
> +	 * disable SAGV if we can't.
> +	 */
> +	blocks = 0;
> +	for_each_plane_id_on_crtc(intel_crtc, plane_id) {
> +		const struct skl_plane_wm *wm =
> +			&crtc_state->wm.skl.optimal.planes[plane_id];
> +
> +		if (plane_id == PLANE_CURSOR) {
> +			if (WARN_ON(wm->sagv_wm_l0.min_ddb_alloc >
> +				    total[PLANE_CURSOR])) {
> +				blocks = U32_MAX;
> +				break;
> +			}
> +			continue;
> +		}
> +
> +		blocks += wm->sagv_wm_l0.min_ddb_alloc;
> +		if (blocks > alloc_size)
> +			return -ENOSPC;
> +	}
> +	return 0;
> +}
> +
>  static int
>  skl_allocate_pipe_ddb(struct intel_crtc_state *crtc_state,
>  		      struct skl_ddb_allocation *ddb /* out */)
> @@ -4739,12 +4893,12 @@ static bool skl_wm_has_lines(struct drm_i915_private *dev_priv, int level)
>  
>  static void skl_compute_plane_wm(const struct intel_crtc_state *crtc_state,
>  				 int level,
> +				 u32 latency,
>  				 const struct skl_wm_params *wp,
>  				 const struct skl_wm_level *result_prev,
>  				 struct skl_wm_level *result /* out */)
>  {
>  	struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
> -	u32 latency = dev_priv->wm.skl_latency[level];
>  	uint_fixed_16_16_t method1, method2;
>  	uint_fixed_16_16_t selected_result;
>  	u32 res_blocks, res_lines, min_ddb_alloc = 0;
> @@ -4865,19 +5019,44 @@ static void skl_compute_plane_wm(const struct intel_crtc_state *crtc_state,
>  static void
>  skl_compute_wm_levels(const struct intel_crtc_state *crtc_state,
>  		      const struct skl_wm_params *wm_params,
> -		      struct skl_wm_level *levels)
> +		      struct skl_plane_wm *plane_wm,
> +		      bool yuv)
>  {
>  	struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
>  	int level, max_level = ilk_wm_max_level(dev_priv);
> +	/*
> +	 * Check which kind of plane is it and based on that calculate
> +	 * correspondent WM levels.
> +	 */
> +	struct skl_wm_level *levels = yuv ? plane_wm->uv_wm : plane_wm->wm;
>  	struct skl_wm_level *result_prev = &levels[0];
>  
>  	for (level = 0; level <= max_level; level++) {
>  		struct skl_wm_level *result = &levels[level];
> +		u32 latency = dev_priv->wm.skl_latency[level];
>  
> -		skl_compute_plane_wm(crtc_state, level, wm_params,
> -				     result_prev, result);
> +		skl_compute_plane_wm(crtc_state, level, latency,
> +				     wm_params, result_prev, result);
>  
>  		result_prev = result;
> +		if (level == 0) {
> +			/*
> +			 * For Gen12 if it is an L0 we need to also
> +			 * consider sagv_block_time when calculating
> +			 * L0 watermark - we will need that when making
> +			 * a decision whether enable SAGV or not.
> +			 * For older gens we agreed to copy L0 value for
> +			 * compatibility.
> +			 */
> +			if ((INTEL_GEN(dev_priv) >= 12)) {
> +				latency += dev_priv->sagv_block_time_us;
> +				skl_compute_plane_wm(crtc_state, level, latency,
> +				     wm_params, result_prev,
> +				    &plane_wm->sagv_wm_l0);
> +			} else
> +				memcpy(&plane_wm->sagv_wm_l0, &levels[0],
> +					sizeof(struct skl_wm_level));

Putting this stuff inside the loop seems a bit silly.

> +		}
>  	}
>  }
>  
> @@ -4971,7 +5150,7 @@ static int skl_build_plane_wm_single(struct intel_crtc_state *crtc_state,
>  	if (ret)
>  		return ret;
>  
> -	skl_compute_wm_levels(crtc_state, &wm_params, wm->wm);
> +	skl_compute_wm_levels(crtc_state, &wm_params, wm, false);
>  	skl_compute_transition_wm(crtc_state, &wm_params, wm);
>  
>  	return 0;
> @@ -4993,7 +5172,7 @@ static int skl_build_plane_wm_uv(struct intel_crtc_state *crtc_state,
>  	if (ret)
>  		return ret;
>  
> -	skl_compute_wm_levels(crtc_state, &wm_params, wm->uv_wm);
> +	skl_compute_wm_levels(crtc_state, &wm_params, wm, true);
>  
>  	return 0;
>  }
> @@ -5541,9 +5720,62 @@ static int skl_wm_add_affected_planes(struct intel_atomic_state *state,
>  	return 0;
>  }
>  
> +static void tgl_check_and_set_sagv(struct intel_atomic_state *state)
> +{
> +	struct drm_device *dev = state->base.dev;
> +	const struct drm_i915_private *dev_priv = to_i915(dev);
> +	struct intel_crtc *crtc;
> +	struct intel_crtc_state *new_crtc_state;
> +	struct intel_crtc_state *old_crtc_state;
> +	struct skl_ddb_allocation *ddb = &state->wm_results.ddb;
> +	int ret, i;
> +
> +	/*
> +	 * Lets assume we can tolerate SAGV for now,
> +	 * until watermark calculations prove the opposite
> +	 * if any of the pipe planes in the state will
> +	 * fail the requirements it will be assigned to false
> +	 * in skl_compute_ddb.
> +	 */
> +	state->gen12_can_sagv = true;
> +
> +	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
> +					    new_crtc_state, i) {
> +		ret = tgl_check_pipe_fits_sagv_wm(new_crtc_state, ddb);
> +		if (ret) {
> +			state->gen12_can_sagv = false;
> +			break;
> +		}

This is not going to work. We need the infromation from _all_ pipes, not
just the ones in the state. We probably want to make that can_sagv thing
a bitmask of pipes so that we don't have to have all pipes in the state.

> +	}
> +
> +	if (state->gen12_can_sagv) {
> +		/*
> +		 * If we determined that we can actually enable SAGV, then
> +		 * actually use those levels tgl_check_pipe_fits_sagv_wm
> +		 * has already taken care of checking if L0 + sagv block time
> +		 * fits into ddb.
> +		 */
> +		for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
> +					    new_crtc_state, i) {
> +			struct intel_plane *plane;
> +			for_each_intel_plane_on_crtc(&dev_priv->drm, crtc, plane) {
> +				enum plane_id plane_id = plane->id;
> +				struct skl_plane_wm *plane_wm = \
> +				    &new_crtc_state->wm.skl.optimal.planes[plane_id];
> +				struct skl_wm_level *sagv_wm0 = &plane_wm->sagv_wm_l0;
> +				struct skl_wm_level *l0_wm0 = &plane_wm->wm[0];
> +
> +				memcpy(l0_wm0, sagv_wm0, sizeof(struct skl_wm_level));
> +			}
> +		}
> +	}
> +}
> +
>  static int
>  skl_compute_wm(struct intel_atomic_state *state)
>  {
> +	struct drm_device *dev = state->base.dev;
> +	const struct drm_i915_private *dev_priv = to_i915(dev);
>  	struct intel_crtc *crtc;
>  	struct intel_crtc_state *new_crtc_state;
>  	struct intel_crtc_state *old_crtc_state;
> @@ -5553,6 +5785,9 @@ skl_compute_wm(struct intel_atomic_state *state)
>  	/* Clear all dirty flags */
>  	results->dirty_pipes = 0;
>  
> +	/* If we exit before check is done */
> +	state->gen12_can_sagv = false;
> +
>  	ret = skl_ddb_add_affected_pipes(state);
>  	if (ret)
>  		return ret;
> @@ -5579,6 +5814,9 @@ skl_compute_wm(struct intel_atomic_state *state)
>  			results->dirty_pipes |= BIT(crtc->pipe);
>  	}
>  
> +	if (INTEL_GEN(dev_priv) >= 12)
> +		tgl_check_and_set_sagv(state);
> +
>  	ret = skl_compute_ddb(state);
>  	if (ret)
>  		return ret;
> -- 
> 2.17.1

-- 
Ville Syrjälä
Intel
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Re: [Intel-gfx] [PATCH v8 1/2] drm/i915: Refactor intel_can_enable_sagv

[Ville Syrjälä]

On Fri, Oct 25, 2019 at 12:53:51PM +0300, Stanislav Lisovskiy wrote:
> Currently intel_can_enable_sagv function contains
> a mix of workarounds for different platforms
> some of them are not valid for gens >= 11 already,
> so lets split it into separate functions.
> 
> v2:
>     - Rework watermark calculation algorithm to
>       attempt to calculate Level 0 watermark
>       with added sagv block time latency and
>       check if it fits in DBuf in order to
>       determine if SAGV can be enabled already
>       at this stage, just as BSpec 49325 states.
>       if that fails rollback to usual Level 0
>       latency and disable SAGV.
>     - Remove unneeded tabs(James Ausmus)
> 
> v3: Rebased the patch
> 
> v4: - Added back interlaced check for Gen12 and
>       added separate function for TGL SAGV check
>       (thanks to James Ausmus for spotting)
>     - Removed unneeded gen check
>     - Extracted Gen12 SAGV decision making code
>       to a separate function from skl_compute_wm
> 
> Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
> Cc: Ville Syrjälä <ville.syrjala@intel.com>
> Cc: James Ausmus <james.ausmus@intel.com>
> ---
>  .../drm/i915/display/intel_display_types.h    |   8 +
>  drivers/gpu/drm/i915/intel_pm.c               | 254 +++++++++++++++++-
>  2 files changed, 254 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
> index 8358152e403e..f09c80c96470 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -490,6 +490,13 @@ struct intel_atomic_state {
>  	 */
>  	u8 active_pipe_changes;
>  
> +	/*
> +	 * For Gen12 only after calculating watermarks with
> +	 * additional latency, we can determine if SAGV can be enabled
> +	 * or not for that particular configuration.
> +	 */
> +	bool gen12_can_sagv;
> +
>  	u8 active_pipes;
>  	/* minimum acceptable cdclk for each pipe */
>  	int min_cdclk[I915_MAX_PIPES];
> @@ -642,6 +649,7 @@ struct skl_plane_wm {
>  	struct skl_wm_level wm[8];
>  	struct skl_wm_level uv_wm[8];
>  	struct skl_wm_level trans_wm;
> +	struct skl_wm_level sagv_wm_l0;

sagv_wm0 (or maybe even just sagv_wm) would be a bit less ugly
name I think.

>  	bool is_planar;
>  };
>  
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index 362234449087..b61eb6aaa89b 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -3751,7 +3751,7 @@ intel_disable_sagv(struct drm_i915_private *dev_priv)
>  	return 0;
>  }
>  
> -bool intel_can_enable_sagv(struct intel_atomic_state *state)
> +bool skl_can_enable_sagv(struct intel_atomic_state *state)
>  {
>  	struct drm_device *dev = state->base.dev;
>  	struct drm_i915_private *dev_priv = to_i915(dev);
> @@ -3817,6 +3817,95 @@ bool intel_can_enable_sagv(struct intel_atomic_state *state)
>  	return true;
>  }
>  
> +bool icl_can_enable_sagv(struct intel_atomic_state *state)
> +{
> +	struct drm_device *dev = state->base.dev;
> +	struct drm_i915_private *dev_priv = to_i915(dev);
> +	struct intel_crtc *crtc;
> +	struct intel_crtc_state *new_crtc_state;
> +	int level, latency;
> +	int i;
> +	int plane_id;
> +
> +	if (!intel_has_sagv(dev_priv))
> +		return false;
> +
> +	/*
> +	 * If there are no active CRTCs, no additional checks need be performed
> +	 */
> +	if (hweight8(state->active_pipes) == 0)
> +		return true;
> +
> +	for_each_new_intel_crtc_in_state(state, crtc,
> +					     new_crtc_state, i) {
> +		unsigned int flags = crtc->base.state->adjusted_mode.flags;
> +
> +		if (flags & DRM_MODE_FLAG_INTERLACE)
> +			return false;
> +
> +		if (!new_crtc_state->base.enable)
> +			continue;

Do we use active or enable elsewhere to decide whether to compute wms
for a pipe? Should be consistent here so we don't get into some wonky
state where we didn't compute normal wms but are computing the sagv wm.

> +
> +		for_each_plane_id_on_crtc(crtc, plane_id) {
> +			struct skl_plane_wm *wm =
> +				&new_crtc_state->wm.skl.optimal.planes[plane_id];
> +
> +			/* Skip this plane if it's not enabled */
> +			if (!wm->wm[0].plane_en)
> +				continue;
> +
> +			/* Find the highest enabled wm level for this plane */
> +			for (level = ilk_wm_max_level(dev_priv);
> +			     !wm->wm[level].plane_en; --level) {
> +			}
> +
> +			latency = dev_priv->wm.skl_latency[level];
> +
> +			/*
> +			 * If any of the planes on this pipe don't enable
> +			 * wm levels that incur memory latencies higher than
> +			 * sagv_block_time_us we can't enable SAGV.
> +			 */
> +			if (latency < dev_priv->sagv_block_time_us)
> +				return false;
> +		}
> +	}
> +
> +	return true;
> +}
> +
> +bool tgl_can_enable_sagv(struct intel_atomic_state *state)
> +{
> +	struct intel_crtc *crtc;
> +	struct intel_crtc_state *new_crtc_state;
> +	int i;
> +
> +	if (!state->gen12_can_sagv)
> +		return false;
> +
> +	for_each_new_intel_crtc_in_state(state, crtc,
> +					     new_crtc_state, i) {
> +		unsigned int flags = crtc->base.state->adjusted_mode.flags;
> +
> +		if (flags & DRM_MODE_FLAG_INTERLACE)
> +			return false;
> +	}
> +	return true;
> +}
> +
> +bool intel_can_enable_sagv(struct intel_atomic_state *state)
> +{
> +	struct drm_device *dev = state->base.dev;
> +	struct drm_i915_private *dev_priv = to_i915(dev);
> +
> +	if (INTEL_GEN(dev_priv) >= 12)
> +		return tgl_can_enable_sagv(state);
> +	else if (INTEL_GEN(dev_priv) == 11)
> +		return icl_can_enable_sagv(state);
> +
> +	return skl_can_enable_sagv(state);

Why do we have three separate code paths now? I believe there should be
just two.

Also if you go to the trouble of adding dev_priv->..can_sagv just make
it work for all platforms.

> +}
> +
>  static u16 intel_get_ddb_size(struct drm_i915_private *dev_priv,
>  			      const struct intel_crtc_state *crtc_state,
>  			      const u64 total_data_rate,
> @@ -3936,6 +4025,7 @@ static int skl_compute_wm_params(const struct intel_crtc_state *crtc_state,
>  				 int color_plane);
>  static void skl_compute_plane_wm(const struct intel_crtc_state *crtc_state,
>  				 int level,
> +				 u32 latency,
>  				 const struct skl_wm_params *wp,
>  				 const struct skl_wm_level *result_prev,
>  				 struct skl_wm_level *result /* out */);
> @@ -3958,7 +4048,9 @@ skl_cursor_allocation(const struct intel_crtc_state *crtc_state,
>  	WARN_ON(ret);
>  
>  	for (level = 0; level <= max_level; level++) {
> -		skl_compute_plane_wm(crtc_state, level, &wp, &wm, &wm);
> +		u32 latency = dev_priv->wm.skl_latency[level];
> +		skl_compute_plane_wm(crtc_state, level, latency, &wp, &wm, &wm);
> +
>  		if (wm.min_ddb_alloc == U16_MAX)
>  			break;
>  
> @@ -4310,6 +4402,68 @@ icl_get_total_relative_data_rate(struct intel_crtc_state *crtc_state,
>  	return total_data_rate;
>  }
>  
> +static int
> +tgl_check_pipe_fits_sagv_wm(struct intel_crtc_state *crtc_state,
> +		      struct skl_ddb_allocation *ddb /* out */)
> +{
> +	struct drm_crtc *crtc = crtc_state->base.crtc;
> +	struct drm_i915_private *dev_priv = to_i915(crtc->dev);
> +	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
> +	struct skl_ddb_entry *alloc = &crtc_state->wm.skl.ddb;
> +	u16 alloc_size;
> +	u16 total[I915_MAX_PLANES] = {};
> +	u64 total_data_rate;
> +	enum plane_id plane_id;
> +	int num_active;
> +	u64 plane_data_rate[I915_MAX_PLANES] = {};
> +	u32 blocks;
> +
> +	/*
> +	 * No need to check gen here, we call this only for gen12
> +	 */
> +	total_data_rate =
> +		icl_get_total_relative_data_rate(crtc_state,
> +						 plane_data_rate);
> +
> +	skl_ddb_get_pipe_allocation_limits(dev_priv, crtc_state,
> +					   total_data_rate,
> +					   ddb, alloc, &num_active);
> +	alloc_size = skl_ddb_entry_size(alloc);
> +	if (alloc_size == 0)
> +		return -ENOSPC;
> +
> +	/* Allocate fixed number of blocks for cursor. */
> +	total[PLANE_CURSOR] = skl_cursor_allocation(crtc_state, num_active);
> +	alloc_size -= total[PLANE_CURSOR];
> +	crtc_state->wm.skl.plane_ddb_y[PLANE_CURSOR].start =
> +		alloc->end - total[PLANE_CURSOR];
> +	crtc_state->wm.skl.plane_ddb_y[PLANE_CURSOR].end = alloc->end;
> +
> +	/*
> +	 * Do check if we can fit L0 + sagv_block_time and
> +	 * disable SAGV if we can't.
> +	 */
> +	blocks = 0;
> +	for_each_plane_id_on_crtc(intel_crtc, plane_id) {
> +		const struct skl_plane_wm *wm =
> +			&crtc_state->wm.skl.optimal.planes[plane_id];
> +
> +		if (plane_id == PLANE_CURSOR) {
> +			if (WARN_ON(wm->sagv_wm_l0.min_ddb_alloc >
> +				    total[PLANE_CURSOR])) {
> +				blocks = U32_MAX;
> +				break;
> +			}
> +			continue;
> +		}
> +
> +		blocks += wm->sagv_wm_l0.min_ddb_alloc;
> +		if (blocks > alloc_size)
> +			return -ENOSPC;
> +	}
> +	return 0;
> +}
> +
>  static int
>  skl_allocate_pipe_ddb(struct intel_crtc_state *crtc_state,
>  		      struct skl_ddb_allocation *ddb /* out */)
> @@ -4739,12 +4893,12 @@ static bool skl_wm_has_lines(struct drm_i915_private *dev_priv, int level)
>  
>  static void skl_compute_plane_wm(const struct intel_crtc_state *crtc_state,
>  				 int level,
> +				 u32 latency,
>  				 const struct skl_wm_params *wp,
>  				 const struct skl_wm_level *result_prev,
>  				 struct skl_wm_level *result /* out */)
>  {
>  	struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
> -	u32 latency = dev_priv->wm.skl_latency[level];
>  	uint_fixed_16_16_t method1, method2;
>  	uint_fixed_16_16_t selected_result;
>  	u32 res_blocks, res_lines, min_ddb_alloc = 0;
> @@ -4865,19 +5019,44 @@ static void skl_compute_plane_wm(const struct intel_crtc_state *crtc_state,
>  static void
>  skl_compute_wm_levels(const struct intel_crtc_state *crtc_state,
>  		      const struct skl_wm_params *wm_params,
> -		      struct skl_wm_level *levels)
> +		      struct skl_plane_wm *plane_wm,
> +		      bool yuv)
>  {
>  	struct drm_i915_private *dev_priv = to_i915(crtc_state->base.crtc->dev);
>  	int level, max_level = ilk_wm_max_level(dev_priv);
> +	/*
> +	 * Check which kind of plane is it and based on that calculate
> +	 * correspondent WM levels.
> +	 */
> +	struct skl_wm_level *levels = yuv ? plane_wm->uv_wm : plane_wm->wm;
>  	struct skl_wm_level *result_prev = &levels[0];
>  
>  	for (level = 0; level <= max_level; level++) {
>  		struct skl_wm_level *result = &levels[level];
> +		u32 latency = dev_priv->wm.skl_latency[level];
>  
> -		skl_compute_plane_wm(crtc_state, level, wm_params,
> -				     result_prev, result);
> +		skl_compute_plane_wm(crtc_state, level, latency,
> +				     wm_params, result_prev, result);
>  
>  		result_prev = result;
> +		if (level == 0) {
> +			/*
> +			 * For Gen12 if it is an L0 we need to also
> +			 * consider sagv_block_time when calculating
> +			 * L0 watermark - we will need that when making
> +			 * a decision whether enable SAGV or not.
> +			 * For older gens we agreed to copy L0 value for
> +			 * compatibility.
> +			 */
> +			if ((INTEL_GEN(dev_priv) >= 12)) {
> +				latency += dev_priv->sagv_block_time_us;
> +				skl_compute_plane_wm(crtc_state, level, latency,
> +				     wm_params, result_prev,
> +				    &plane_wm->sagv_wm_l0);
> +			} else
> +				memcpy(&plane_wm->sagv_wm_l0, &levels[0],
> +					sizeof(struct skl_wm_level));

Putting this stuff inside the loop seems a bit silly.

> +		}
>  	}
>  }
>  
> @@ -4971,7 +5150,7 @@ static int skl_build_plane_wm_single(struct intel_crtc_state *crtc_state,
>  	if (ret)
>  		return ret;
>  
> -	skl_compute_wm_levels(crtc_state, &wm_params, wm->wm);
> +	skl_compute_wm_levels(crtc_state, &wm_params, wm, false);
>  	skl_compute_transition_wm(crtc_state, &wm_params, wm);
>  
>  	return 0;
> @@ -4993,7 +5172,7 @@ static int skl_build_plane_wm_uv(struct intel_crtc_state *crtc_state,
>  	if (ret)
>  		return ret;
>  
> -	skl_compute_wm_levels(crtc_state, &wm_params, wm->uv_wm);
> +	skl_compute_wm_levels(crtc_state, &wm_params, wm, true);
>  
>  	return 0;
>  }
> @@ -5541,9 +5720,62 @@ static int skl_wm_add_affected_planes(struct intel_atomic_state *state,
>  	return 0;
>  }
>  
> +static void tgl_check_and_set_sagv(struct intel_atomic_state *state)
> +{
> +	struct drm_device *dev = state->base.dev;
> +	const struct drm_i915_private *dev_priv = to_i915(dev);
> +	struct intel_crtc *crtc;
> +	struct intel_crtc_state *new_crtc_state;
> +	struct intel_crtc_state *old_crtc_state;
> +	struct skl_ddb_allocation *ddb = &state->wm_results.ddb;
> +	int ret, i;
> +
> +	/*
> +	 * Lets assume we can tolerate SAGV for now,
> +	 * until watermark calculations prove the opposite
> +	 * if any of the pipe planes in the state will
> +	 * fail the requirements it will be assigned to false
> +	 * in skl_compute_ddb.
> +	 */
> +	state->gen12_can_sagv = true;
> +
> +	for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
> +					    new_crtc_state, i) {
> +		ret = tgl_check_pipe_fits_sagv_wm(new_crtc_state, ddb);
> +		if (ret) {
> +			state->gen12_can_sagv = false;
> +			break;
> +		}

This is not going to work. We need the infromation from _all_ pipes, not
just the ones in the state. We probably want to make that can_sagv thing
a bitmask of pipes so that we don't have to have all pipes in the state.

> +	}
> +
> +	if (state->gen12_can_sagv) {
> +		/*
> +		 * If we determined that we can actually enable SAGV, then
> +		 * actually use those levels tgl_check_pipe_fits_sagv_wm
> +		 * has already taken care of checking if L0 + sagv block time
> +		 * fits into ddb.
> +		 */
> +		for_each_oldnew_intel_crtc_in_state(state, crtc, old_crtc_state,
> +					    new_crtc_state, i) {
> +			struct intel_plane *plane;
> +			for_each_intel_plane_on_crtc(&dev_priv->drm, crtc, plane) {
> +				enum plane_id plane_id = plane->id;
> +				struct skl_plane_wm *plane_wm = \
> +				    &new_crtc_state->wm.skl.optimal.planes[plane_id];
> +				struct skl_wm_level *sagv_wm0 = &plane_wm->sagv_wm_l0;
> +				struct skl_wm_level *l0_wm0 = &plane_wm->wm[0];
> +
> +				memcpy(l0_wm0, sagv_wm0, sizeof(struct skl_wm_level));
> +			}
> +		}
> +	}
> +}
> +
>  static int
>  skl_compute_wm(struct intel_atomic_state *state)
>  {
> +	struct drm_device *dev = state->base.dev;
> +	const struct drm_i915_private *dev_priv = to_i915(dev);
>  	struct intel_crtc *crtc;
>  	struct intel_crtc_state *new_crtc_state;
>  	struct intel_crtc_state *old_crtc_state;
> @@ -5553,6 +5785,9 @@ skl_compute_wm(struct intel_atomic_state *state)
>  	/* Clear all dirty flags */
>  	results->dirty_pipes = 0;
>  
> +	/* If we exit before check is done */
> +	state->gen12_can_sagv = false;
> +
>  	ret = skl_ddb_add_affected_pipes(state);
>  	if (ret)
>  		return ret;
> @@ -5579,6 +5814,9 @@ skl_compute_wm(struct intel_atomic_state *state)
>  			results->dirty_pipes |= BIT(crtc->pipe);
>  	}
>  
> +	if (INTEL_GEN(dev_priv) >= 12)
> +		tgl_check_and_set_sagv(state);
> +
>  	ret = skl_compute_ddb(state);
>  	if (ret)
>  		return ret;
> -- 
> 2.17.1

-- 
Ville Syrjälä
Intel
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Re: [PATCH v8 1/2] drm/i915: Refactor intel_can_enable_sagv

[Lisovskiy, Stanislav]

On Fri, 2019-10-25 at 13:24 +0300, Ville Syrjälä wrote:
> On Fri, Oct 25, 2019 at 12:53:51PM +0300, Stanislav Lisovskiy wrote:
> > Currently intel_can_enable_sagv function contains
> > a mix of workarounds for different platforms
> > some of them are not valid for gens >= 11 already,
> > so lets split it into separate functions.
> > 
> > v2:
> >     - Rework watermark calculation algorithm to
> >       attempt to calculate Level 0 watermark
> >       with added sagv block time latency and
> >       check if it fits in DBuf in order to
> >       determine if SAGV can be enabled already
> >       at this stage, just as BSpec 49325 states.
> >       if that fails rollback to usual Level 0
> >       latency and disable SAGV.
> >     - Remove unneeded tabs(James Ausmus)
> > 
> > v3: Rebased the patch
> > 
> > v4: - Added back interlaced check for Gen12 and
> >       added separate function for TGL SAGV check
> >       (thanks to James Ausmus for spotting)
> >     - Removed unneeded gen check
> >     - Extracted Gen12 SAGV decision making code
> >       to a separate function from skl_compute_wm
> > 
> > Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
> > Cc: Ville Syrjälä <ville.syrjala@intel.com>
> > Cc: James Ausmus <james.ausmus@intel.com>
> > ---
> >  .../drm/i915/display/intel_display_types.h    |   8 +
> >  drivers/gpu/drm/i915/intel_pm.c               | 254
> > +++++++++++++++++-
> >  2 files changed, 254 insertions(+), 8 deletions(-)
> > 
> > 
> Do we use active or enable elsewhere to decide whether to compute wms
> for a pipe? Should be consistent here so we don't get into some wonky
> state where we didn't compute normal wms but are computing the sagv
> wm.

Good question, I have seen it either this or that everywhere, so we 
probably need to discuss which one I should use.

> 
> > +
> > +		for_each_plane_id_on_crtc(crtc, plane_id) {
> > +			struct skl_plane_wm *wm =
> > +				&new_crtc_state-
> > >wm.skl.optimal.planes[plane_id];
> > +
> > +			/* Skip this plane if it's not enabled */
> > +			if (!wm->wm[0].plane_en)
> > +				continue;
> > +
> > +			/* Find the highest enabled wm level for this
> > plane */
> > +			for (level = ilk_wm_max_level(dev_priv);
> > +			     !wm->wm[level].plane_en; --level) {
> > +			}
> > +
> > +			latency = dev_priv->wm.skl_latency[level];
> > +
> > +			/*
> > +			 * If any of the planes on this pipe don't
> > enable
> > +			 * wm levels that incur memory latencies higher
> > than
> > +			 * sagv_block_time_us we can't enable SAGV.
> > +			 */
> > +			if (latency < dev_priv->sagv_block_time_us)
> > +				return false;
> > +		}
> > +	}
> > +
> > +	return true;
> > +}
> > +
> > 

> > +bool intel_can_enable_sagv(struct intel_atomic_state *state)
> > +{
> > +	struct drm_device *dev = state->base.dev;
> > +	struct drm_i915_private *dev_priv = to_i915(dev);
> > +
> > +	if (INTEL_GEN(dev_priv) >= 12)
> > +		return tgl_can_enable_sagv(state);
> > +	else if (INTEL_GEN(dev_priv) == 11)
> > +		return icl_can_enable_sagv(state);
> > +
> > +	return skl_can_enable_sagv(state);
> 
> Why do we have three separate code paths now? I believe there should
> be
> just two.
> 
> Also if you go to the trouble of adding dev_priv->..can_sagv just
> make
> it work for all platforms.

..can_sagv is not in dev_priv - it is part of intel_atomic_state,
so at least here I avoided using dev_priv.

> 
> > 
> >  	
> > +	/*
> > +	 * Lets assume we can tolerate SAGV for now,
> > +	 * until watermark calculations prove the opposite
> > +	 * if any of the pipe planes in the state will
> > +	 * fail the requirements it will be assigned to false
> > +	 * in skl_compute_ddb.
> > +	 */
> > +	state->gen12_can_sagv = true;
> > +
> > +	for_each_oldnew_intel_crtc_in_state(state, crtc,
> > old_crtc_state,
> > +					    new_crtc_state, i) {
> > +		ret = tgl_check_pipe_fits_sagv_wm(new_crtc_state, ddb);
> > +		if (ret) {
> > +			state->gen12_can_sagv = false;
> > +			break;
> +		}
> 
> This is not going to work. We need the infromation from _all_ pipes,
> not
> just the ones in the state. We probably want to make that can_sagv
> thing
> a bitmask of pipes so that we don't have to have all pipes in the
> state.

But isn't it so that even if at least one plane/pipe can't tolerate
SAGV, we can't enable it already? So what is the point of checking
other planes/pipes then?
Or may be I'm missing something here.

> 
> > +	}
> > +
> > +	if (state->gen12_can_sagv) {
> > +		/*
> > +		 * If we determined that we can actually enable SAGV,
> > then
> > +		 * actually use those levels
> > tgl_check_pipe_fits_sagv_wm
> > +		 * has already taken care of checking if L0 + sagv
> > block time
> > +		 * fits into ddb.
> > +		 */
> > +		for_each_oldnew_intel_crtc_in_state(state, crtc,
> > old_crtc_state,
> > +					    new_crtc_state, i) {
> > +			struct intel_plane *plane;
> > +			for_each_intel_plane_on_crtc(&dev_priv->drm,
> > crtc, plane) {
> > +				enum plane_id plane_id = plane->id;
> > +				struct skl_plane_wm *plane_wm = \
> > +				    &new_crtc_state-
> > >wm.skl.optimal.planes[plane_id];
> > +				struct skl_wm_level *sagv_wm0 =
> > &plane_wm->sagv_wm_l0;
> > +				struct skl_wm_level *l0_wm0 =
> > &plane_wm->wm[0];
> > +
> > +				memcpy(l0_wm0, sagv_wm0, sizeof(struct
> > skl_wm_level));
> > +			}
> > +		}
> > +	}
> > +}
> > +
> >  static int
> >  skl_compute_wm(struct intel_atomic_state *state)
> >  {
> > +	struct drm_device *dev = state->base.dev;
> > +	const struct drm_i915_private *dev_priv = to_i915(dev);
> >  	struct intel_crtc *crtc;
> >  	struct intel_crtc_state *new_crtc_state;
> >  	struct intel_crtc_state *old_crtc_state;
> > @@ -5553,6 +5785,9 @@ skl_compute_wm(struct intel_atomic_state
> > *state)
> >  	/* Clear all dirty flags */
> >  	results->dirty_pipes = 0;
> >  
> > +	/* If we exit before check is done */
> > +	state->gen12_can_sagv = false;
> > +
> >  	ret = skl_ddb_add_affected_pipes(state);
> >  	if (ret)
> >  		return ret;
> > @@ -5579,6 +5814,9 @@ skl_compute_wm(struct intel_atomic_state
> > *state)
> >  			results->dirty_pipes |= BIT(crtc->pipe);
> >  	}
> >  
> > +	if (INTEL_GEN(dev_priv) >= 12)
> > +		tgl_check_and_set_sagv(state);
> > +
> >  	ret = skl_compute_ddb(state);
> >  	if (ret)
> >  		return ret;
> > -- 
> > 2.17.1
> 
> 
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Re: [Intel-gfx] [PATCH v8 1/2] drm/i915: Refactor intel_can_enable_sagv

[Lisovskiy, Stanislav]

On Fri, 2019-10-25 at 13:24 +0300, Ville Syrjälä wrote:
> On Fri, Oct 25, 2019 at 12:53:51PM +0300, Stanislav Lisovskiy wrote:
> > Currently intel_can_enable_sagv function contains
> > a mix of workarounds for different platforms
> > some of them are not valid for gens >= 11 already,
> > so lets split it into separate functions.
> > 
> > v2:
> >     - Rework watermark calculation algorithm to
> >       attempt to calculate Level 0 watermark
> >       with added sagv block time latency and
> >       check if it fits in DBuf in order to
> >       determine if SAGV can be enabled already
> >       at this stage, just as BSpec 49325 states.
> >       if that fails rollback to usual Level 0
> >       latency and disable SAGV.
> >     - Remove unneeded tabs(James Ausmus)
> > 
> > v3: Rebased the patch
> > 
> > v4: - Added back interlaced check for Gen12 and
> >       added separate function for TGL SAGV check
> >       (thanks to James Ausmus for spotting)
> >     - Removed unneeded gen check
> >     - Extracted Gen12 SAGV decision making code
> >       to a separate function from skl_compute_wm
> > 
> > Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
> > Cc: Ville Syrjälä <ville.syrjala@intel.com>
> > Cc: James Ausmus <james.ausmus@intel.com>
> > ---
> >  .../drm/i915/display/intel_display_types.h    |   8 +
> >  drivers/gpu/drm/i915/intel_pm.c               | 254
> > +++++++++++++++++-
> >  2 files changed, 254 insertions(+), 8 deletions(-)
> > 
> > 
> Do we use active or enable elsewhere to decide whether to compute wms
> for a pipe? Should be consistent here so we don't get into some wonky
> state where we didn't compute normal wms but are computing the sagv
> wm.

Good question, I have seen it either this or that everywhere, so we 
probably need to discuss which one I should use.

> 
> > +
> > +		for_each_plane_id_on_crtc(crtc, plane_id) {
> > +			struct skl_plane_wm *wm =
> > +				&new_crtc_state-
> > >wm.skl.optimal.planes[plane_id];
> > +
> > +			/* Skip this plane if it's not enabled */
> > +			if (!wm->wm[0].plane_en)
> > +				continue;
> > +
> > +			/* Find the highest enabled wm level for this
> > plane */
> > +			for (level = ilk_wm_max_level(dev_priv);
> > +			     !wm->wm[level].plane_en; --level) {
> > +			}
> > +
> > +			latency = dev_priv->wm.skl_latency[level];
> > +
> > +			/*
> > +			 * If any of the planes on this pipe don't
> > enable
> > +			 * wm levels that incur memory latencies higher
> > than
> > +			 * sagv_block_time_us we can't enable SAGV.
> > +			 */
> > +			if (latency < dev_priv->sagv_block_time_us)
> > +				return false;
> > +		}
> > +	}
> > +
> > +	return true;
> > +}
> > +
> > 

> > +bool intel_can_enable_sagv(struct intel_atomic_state *state)
> > +{
> > +	struct drm_device *dev = state->base.dev;
> > +	struct drm_i915_private *dev_priv = to_i915(dev);
> > +
> > +	if (INTEL_GEN(dev_priv) >= 12)
> > +		return tgl_can_enable_sagv(state);
> > +	else if (INTEL_GEN(dev_priv) == 11)
> > +		return icl_can_enable_sagv(state);
> > +
> > +	return skl_can_enable_sagv(state);
> 
> Why do we have three separate code paths now? I believe there should
> be
> just two.
> 
> Also if you go to the trouble of adding dev_priv->..can_sagv just
> make
> it work for all platforms.

..can_sagv is not in dev_priv - it is part of intel_atomic_state,
so at least here I avoided using dev_priv.

> 
> > 
> >  	
> > +	/*
> > +	 * Lets assume we can tolerate SAGV for now,
> > +	 * until watermark calculations prove the opposite
> > +	 * if any of the pipe planes in the state will
> > +	 * fail the requirements it will be assigned to false
> > +	 * in skl_compute_ddb.
> > +	 */
> > +	state->gen12_can_sagv = true;
> > +
> > +	for_each_oldnew_intel_crtc_in_state(state, crtc,
> > old_crtc_state,
> > +					    new_crtc_state, i) {
> > +		ret = tgl_check_pipe_fits_sagv_wm(new_crtc_state, ddb);
> > +		if (ret) {
> > +			state->gen12_can_sagv = false;
> > +			break;
> +		}
> 
> This is not going to work. We need the infromation from _all_ pipes,
> not
> just the ones in the state. We probably want to make that can_sagv
> thing
> a bitmask of pipes so that we don't have to have all pipes in the
> state.

But isn't it so that even if at least one plane/pipe can't tolerate
SAGV, we can't enable it already? So what is the point of checking
other planes/pipes then?
Or may be I'm missing something here.

> 
> > +	}
> > +
> > +	if (state->gen12_can_sagv) {
> > +		/*
> > +		 * If we determined that we can actually enable SAGV,
> > then
> > +		 * actually use those levels
> > tgl_check_pipe_fits_sagv_wm
> > +		 * has already taken care of checking if L0 + sagv
> > block time
> > +		 * fits into ddb.
> > +		 */
> > +		for_each_oldnew_intel_crtc_in_state(state, crtc,
> > old_crtc_state,
> > +					    new_crtc_state, i) {
> > +			struct intel_plane *plane;
> > +			for_each_intel_plane_on_crtc(&dev_priv->drm,
> > crtc, plane) {
> > +				enum plane_id plane_id = plane->id;
> > +				struct skl_plane_wm *plane_wm = \
> > +				    &new_crtc_state-
> > >wm.skl.optimal.planes[plane_id];
> > +				struct skl_wm_level *sagv_wm0 =
> > &plane_wm->sagv_wm_l0;
> > +				struct skl_wm_level *l0_wm0 =
> > &plane_wm->wm[0];
> > +
> > +				memcpy(l0_wm0, sagv_wm0, sizeof(struct
> > skl_wm_level));
> > +			}
> > +		}
> > +	}
> > +}
> > +
> >  static int
> >  skl_compute_wm(struct intel_atomic_state *state)
> >  {
> > +	struct drm_device *dev = state->base.dev;
> > +	const struct drm_i915_private *dev_priv = to_i915(dev);
> >  	struct intel_crtc *crtc;
> >  	struct intel_crtc_state *new_crtc_state;
> >  	struct intel_crtc_state *old_crtc_state;
> > @@ -5553,6 +5785,9 @@ skl_compute_wm(struct intel_atomic_state
> > *state)
> >  	/* Clear all dirty flags */
> >  	results->dirty_pipes = 0;
> >  
> > +	/* If we exit before check is done */
> > +	state->gen12_can_sagv = false;
> > +
> >  	ret = skl_ddb_add_affected_pipes(state);
> >  	if (ret)
> >  		return ret;
> > @@ -5579,6 +5814,9 @@ skl_compute_wm(struct intel_atomic_state
> > *state)
> >  			results->dirty_pipes |= BIT(crtc->pipe);
> >  	}
> >  
> > +	if (INTEL_GEN(dev_priv) >= 12)
> > +		tgl_check_and_set_sagv(state);
> > +
> >  	ret = skl_compute_ddb(state);
> >  	if (ret)
> >  		return ret;
> > -- 
> > 2.17.1
> 
> 
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Re: [PATCH v8 1/2] drm/i915: Refactor intel_can_enable_sagv

[Lisovskiy, Stanislav]

On Fri, 2019-10-25 at 10:44 +0000, Lisovskiy, Stanislav wrote:
> On Fri, 2019-10-25 at 13:24 +0300, Ville Syrjälä wrote:
> > On Fri, Oct 25, 2019 at 12:53:51PM +0300, Stanislav Lisovskiy
> > wrote:
> > > Currently intel_can_enable_sagv function contains
> > > a mix of workarounds for different platforms
> > > some of them are not valid for gens >= 11 already,
> > > so lets split it into separate functions.
> > > 
> > > v2:
> > >     - Rework watermark calculation algorithm to
> > >       attempt to calculate Level 0 watermark
> > >       with added sagv block time latency and
> > >       check if it fits in DBuf in order to
> > >       determine if SAGV can be enabled already
> > >       at this stage, just as BSpec 49325 states.
> > >       if that fails rollback to usual Level 0
> > >       latency and disable SAGV.
> > >     - Remove unneeded tabs(James Ausmus)
> > > 
> > > v3: Rebased the patch
> > > 
> > > v4: - Added back interlaced check for Gen12 and
> > >       added separate function for TGL SAGV check
> > >       (thanks to James Ausmus for spotting)
> > >     - Removed unneeded gen check
> > >     - Extracted Gen12 SAGV decision making code
> > >       to a separate function from skl_compute_wm
> > > 
> > > Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com
> > > >
> > > Cc: Ville Syrjälä <ville.syrjala@intel.com>
> > > Cc: James Ausmus <james.ausmus@intel.com>
> > > ---
> > >  .../drm/i915/display/intel_display_types.h    |   8 +
> > >  drivers/gpu/drm/i915/intel_pm.c               | 254
> > > +++++++++++++++++-
> > >  2 files changed, 254 insertions(+), 8 deletions(-)
> > > 
> > > 
> > 
> > > 
> > >  	
> > > +	/*
> > > +	 * Lets assume we can tolerate SAGV for now,
> > > +	 * until watermark calculations prove the opposite
> > > +	 * if any of the pipe planes in the state will
> > > +	 * fail the requirements it will be assigned to false
> > > +	 * in skl_compute_ddb.
> > > +	 */
> > > +	state->gen12_can_sagv = true;
> > > +
> > > +	for_each_oldnew_intel_crtc_in_state(state, crtc,
> > > old_crtc_state,
> > > +					    new_crtc_state, i) {
> > > +		ret = tgl_check_pipe_fits_sagv_wm(new_crtc_state, ddb);
> > > +		if (ret) {
> > > +			state->gen12_can_sagv = false;
> > > +			break;
> > 
> > +		}
> > 
> > This is not going to work. We need the infromation from _all_
> > pipes,
> > not
> > just the ones in the state. We probably want to make that can_sagv
> > thing
> > a bitmask of pipes so that we don't have to have all pipes in the
> > state.
> 
> But isn't it so that even if at least one plane/pipe can't tolerate
> SAGV, we can't enable it already? So what is the point of checking
> other planes/pipes then?
> Or may be I'm missing something here.

Ok, I think I get your point actually. As we don't have all pipes in
the state we might wrongly come to conclusion that we can enable SAGV
here. Also probably it really means that I will have to move
gen12_can_sagv from intel_atomic_state to our favourite dev_priv struct
as we will have to track all of the pipes in global state.

Regarding 3 different code paths from can_enable_sagv problem is that
in reality as I understand those are different, for example we disable
SAGV for SKL if there multiple active pipes, while for ICL we don't.

Also as we discussed ICL and TGL have completely different ways of
treating sagv_block_time(at least according to current BSpec) I could
unite all of those functions to one however it
would then contains multiple platform checks and stuff like that.

> 
> > 
> > > +	}
> > > +
> > > +	if (state->gen12_can_sagv) {
> > > +		/*
> > > +		 * If we determined that we can actually enable SAGV,
> > > then
> > > +		 * actually use those levels
> > > tgl_check_pipe_fits_sagv_wm
> > > +		 * has already taken care of checking if L0 + sagv
> > > block time
> > > +		 * fits into ddb.
> > > +		 */
> > > +		for_each_oldnew_intel_crtc_in_state(state, crtc,
> > > old_crtc_state,
> > > +					    new_crtc_state, i) {
> > > +			struct intel_plane *plane;
> > > +			for_each_intel_plane_on_crtc(&dev_priv->drm,
> > > crtc, plane) {
> > > +				enum plane_id plane_id = plane->id;
> > > +				struct skl_plane_wm *plane_wm = \
> > > +				    &new_crtc_state-
> > > > wm.skl.optimal.planes[plane_id];
> > > 
> > > +				struct skl_wm_level *sagv_wm0 =
> > > &plane_wm->sagv_wm_l0;
> > > +				struct skl_wm_level *l0_wm0 =
> > > &plane_wm->wm[0];
> > > +
> > > +				memcpy(l0_wm0, sagv_wm0, sizeof(struct
> > > skl_wm_level));
> > > +			}
> > > +		}
> > > +	}
> > > +}
> > > +
> > >  static int
> > >  skl_compute_wm(struct intel_atomic_state *state)
> > >  {
> > > +	struct drm_device *dev = state->base.dev;
> > > +	const struct drm_i915_private *dev_priv = to_i915(dev);
> > >  	struct intel_crtc *crtc;
> > >  	struct intel_crtc_state *new_crtc_state;
> > >  	struct intel_crtc_state *old_crtc_state;
> > > @@ -5553,6 +5785,9 @@ skl_compute_wm(struct intel_atomic_state
> > > *state)
> > >  	/* Clear all dirty flags */
> > >  	results->dirty_pipes = 0;
> > >  
> > > +	/* If we exit before check is done */
> > > +	state->gen12_can_sagv = false;
> > > +
> > >  	ret = skl_ddb_add_affected_pipes(state);
> > >  	if (ret)
> > >  		return ret;
> > > @@ -5579,6 +5814,9 @@ skl_compute_wm(struct intel_atomic_state
> > > *state)
> > >  			results->dirty_pipes |= BIT(crtc->pipe);
> > >  	}
> > >  
> > > +	if (INTEL_GEN(dev_priv) >= 12)
> > > +		tgl_check_and_set_sagv(state);
> > > +
> > >  	ret = skl_compute_ddb(state);
> > >  	if (ret)
> > >  		return ret;
> > > -- 
> > > 2.17.1
> > 
> > 
> 
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Re: [Intel-gfx] [PATCH v8 1/2] drm/i915: Refactor intel_can_enable_sagv

[Lisovskiy, Stanislav]

On Fri, 2019-10-25 at 10:44 +0000, Lisovskiy, Stanislav wrote:
> On Fri, 2019-10-25 at 13:24 +0300, Ville Syrjälä wrote:
> > On Fri, Oct 25, 2019 at 12:53:51PM +0300, Stanislav Lisovskiy
> > wrote:
> > > Currently intel_can_enable_sagv function contains
> > > a mix of workarounds for different platforms
> > > some of them are not valid for gens >= 11 already,
> > > so lets split it into separate functions.
> > > 
> > > v2:
> > >     - Rework watermark calculation algorithm to
> > >       attempt to calculate Level 0 watermark
> > >       with added sagv block time latency and
> > >       check if it fits in DBuf in order to
> > >       determine if SAGV can be enabled already
> > >       at this stage, just as BSpec 49325 states.
> > >       if that fails rollback to usual Level 0
> > >       latency and disable SAGV.
> > >     - Remove unneeded tabs(James Ausmus)
> > > 
> > > v3: Rebased the patch
> > > 
> > > v4: - Added back interlaced check for Gen12 and
> > >       added separate function for TGL SAGV check
> > >       (thanks to James Ausmus for spotting)
> > >     - Removed unneeded gen check
> > >     - Extracted Gen12 SAGV decision making code
> > >       to a separate function from skl_compute_wm
> > > 
> > > Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com
> > > >
> > > Cc: Ville Syrjälä <ville.syrjala@intel.com>
> > > Cc: James Ausmus <james.ausmus@intel.com>
> > > ---
> > >  .../drm/i915/display/intel_display_types.h    |   8 +
> > >  drivers/gpu/drm/i915/intel_pm.c               | 254
> > > +++++++++++++++++-
> > >  2 files changed, 254 insertions(+), 8 deletions(-)
> > > 
> > > 
> > 
> > > 
> > >  	
> > > +	/*
> > > +	 * Lets assume we can tolerate SAGV for now,
> > > +	 * until watermark calculations prove the opposite
> > > +	 * if any of the pipe planes in the state will
> > > +	 * fail the requirements it will be assigned to false
> > > +	 * in skl_compute_ddb.
> > > +	 */
> > > +	state->gen12_can_sagv = true;
> > > +
> > > +	for_each_oldnew_intel_crtc_in_state(state, crtc,
> > > old_crtc_state,
> > > +					    new_crtc_state, i) {
> > > +		ret = tgl_check_pipe_fits_sagv_wm(new_crtc_state, ddb);
> > > +		if (ret) {
> > > +			state->gen12_can_sagv = false;
> > > +			break;
> > 
> > +		}
> > 
> > This is not going to work. We need the infromation from _all_
> > pipes,
> > not
> > just the ones in the state. We probably want to make that can_sagv
> > thing
> > a bitmask of pipes so that we don't have to have all pipes in the
> > state.
> 
> But isn't it so that even if at least one plane/pipe can't tolerate
> SAGV, we can't enable it already? So what is the point of checking
> other planes/pipes then?
> Or may be I'm missing something here.

Ok, I think I get your point actually. As we don't have all pipes in
the state we might wrongly come to conclusion that we can enable SAGV
here. Also probably it really means that I will have to move
gen12_can_sagv from intel_atomic_state to our favourite dev_priv struct
as we will have to track all of the pipes in global state.

Regarding 3 different code paths from can_enable_sagv problem is that
in reality as I understand those are different, for example we disable
SAGV for SKL if there multiple active pipes, while for ICL we don't.

Also as we discussed ICL and TGL have completely different ways of
treating sagv_block_time(at least according to current BSpec) I could
unite all of those functions to one however it
would then contains multiple platform checks and stuff like that.

> 
> > 
> > > +	}
> > > +
> > > +	if (state->gen12_can_sagv) {
> > > +		/*
> > > +		 * If we determined that we can actually enable SAGV,
> > > then
> > > +		 * actually use those levels
> > > tgl_check_pipe_fits_sagv_wm
> > > +		 * has already taken care of checking if L0 + sagv
> > > block time
> > > +		 * fits into ddb.
> > > +		 */
> > > +		for_each_oldnew_intel_crtc_in_state(state, crtc,
> > > old_crtc_state,
> > > +					    new_crtc_state, i) {
> > > +			struct intel_plane *plane;
> > > +			for_each_intel_plane_on_crtc(&dev_priv->drm,
> > > crtc, plane) {
> > > +				enum plane_id plane_id = plane->id;
> > > +				struct skl_plane_wm *plane_wm = \
> > > +				    &new_crtc_state-
> > > > wm.skl.optimal.planes[plane_id];
> > > 
> > > +				struct skl_wm_level *sagv_wm0 =
> > > &plane_wm->sagv_wm_l0;
> > > +				struct skl_wm_level *l0_wm0 =
> > > &plane_wm->wm[0];
> > > +
> > > +				memcpy(l0_wm0, sagv_wm0, sizeof(struct
> > > skl_wm_level));
> > > +			}
> > > +		}
> > > +	}
> > > +}
> > > +
> > >  static int
> > >  skl_compute_wm(struct intel_atomic_state *state)
> > >  {
> > > +	struct drm_device *dev = state->base.dev;
> > > +	const struct drm_i915_private *dev_priv = to_i915(dev);
> > >  	struct intel_crtc *crtc;
> > >  	struct intel_crtc_state *new_crtc_state;
> > >  	struct intel_crtc_state *old_crtc_state;
> > > @@ -5553,6 +5785,9 @@ skl_compute_wm(struct intel_atomic_state
> > > *state)
> > >  	/* Clear all dirty flags */
> > >  	results->dirty_pipes = 0;
> > >  
> > > +	/* If we exit before check is done */
> > > +	state->gen12_can_sagv = false;
> > > +
> > >  	ret = skl_ddb_add_affected_pipes(state);
> > >  	if (ret)
> > >  		return ret;
> > > @@ -5579,6 +5814,9 @@ skl_compute_wm(struct intel_atomic_state
> > > *state)
> > >  			results->dirty_pipes |= BIT(crtc->pipe);
> > >  	}
> > >  
> > > +	if (INTEL_GEN(dev_priv) >= 12)
> > > +		tgl_check_and_set_sagv(state);
> > > +
> > >  	ret = skl_compute_ddb(state);
> > >  	if (ret)
> > >  		return ret;
> > > -- 
> > > 2.17.1
> > 
> > 
> 
> _______________________________________________
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> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
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[PATCH v8 2/2] drm/i915: Restrict qgv points which don't have enough bandwidth.

[Stanislav Lisovskiy]

According to BSpec 53998, we should try to
restrict qgv points, which can't provide
enough bandwidth for desired display configuration.

Currently we are just comparing against all of
those and take minimum(worst case).

v2: Fixed wrong PCode reply mask, removed hardcoded
    values.

v3: Forbid simultaneous legacy SAGV PCode requests and
    restricting qgv points. Put the actual restriction
    to commit function, added serialization(thanks to Ville)
    to prevent commit being applied out of order in case of
    nonblocking and/or nomodeset commits.

v4:
    - Minor code refactoring, fixed few typos(thanks to James Ausmus)
    - Change the naming of qgv point
      masking/unmasking functions(James Ausmus).
    - Simplify the masking/unmasking operation itself,
      as we don't need to mask only single point per request(James Ausmus)
    - Reject and stick to highest bandwidth point if SAGV
      can't be enabled(BSpec)

v5:
    - Add new mailbox reply codes, which seems to happen during boot
      time for TGL and indicate that QGV setting is not yet available.

v6:
    - Increase number of supported QGV points to be in sync with BSpec.

Reviewed-by: James Ausmus <james.ausmus@intel.com>
Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Cc: Ville Syrjälä <ville.syrjala@intel.com>
Cc: James Ausmus <james.ausmus@intel.com>
---
 drivers/gpu/drm/i915/display/intel_atomic.c   |  16 +++
 drivers/gpu/drm/i915/display/intel_atomic.h   |   3 +
 drivers/gpu/drm/i915/display/intel_bw.c       | 111 ++++++++++++++----
 drivers/gpu/drm/i915/display/intel_bw.h       |   2 +
 drivers/gpu/drm/i915/display/intel_display.c  |  57 ++++++++-
 .../drm/i915/display/intel_display_types.h    |   3 +
 drivers/gpu/drm/i915/i915_drv.h               |   2 +
 drivers/gpu/drm/i915/i915_reg.h               |   5 +
 drivers/gpu/drm/i915/intel_sideband.c         |  27 ++++-
 9 files changed, 198 insertions(+), 28 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_atomic.c b/drivers/gpu/drm/i915/display/intel_atomic.c
index c5a552a69752..b3f4f02f380b 100644
--- a/drivers/gpu/drm/i915/display/intel_atomic.c
+++ b/drivers/gpu/drm/i915/display/intel_atomic.c
@@ -207,6 +207,22 @@ intel_crtc_duplicate_state(struct drm_crtc *crtc)
 	return &crtc_state->base;
 }
 
+int intel_atomic_serialize_global_state(struct intel_atomic_state *state)
+{
+	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
+	struct intel_crtc *crtc;
+
+	for_each_intel_crtc(&dev_priv->drm, crtc) {
+		struct intel_crtc_state *crtc_state;
+
+		crtc_state = intel_atomic_get_crtc_state(&state->base, crtc);
+		if (IS_ERR(crtc_state))
+			return PTR_ERR(crtc_state);
+	}
+
+	return 0;
+}
+
 /**
  * intel_crtc_destroy_state - destroy crtc state
  * @crtc: drm crtc
diff --git a/drivers/gpu/drm/i915/display/intel_atomic.h b/drivers/gpu/drm/i915/display/intel_atomic.h
index 58065d3161a3..fd17b3ca257f 100644
--- a/drivers/gpu/drm/i915/display/intel_atomic.h
+++ b/drivers/gpu/drm/i915/display/intel_atomic.h
@@ -7,6 +7,7 @@
 #define __INTEL_ATOMIC_H__
 
 #include <linux/types.h>
+#include "intel_display_types.h"
 
 struct drm_atomic_state;
 struct drm_connector;
@@ -38,6 +39,8 @@ void intel_crtc_destroy_state(struct drm_crtc *crtc,
 struct drm_atomic_state *intel_atomic_state_alloc(struct drm_device *dev);
 void intel_atomic_state_clear(struct drm_atomic_state *state);
 
+int intel_atomic_serialize_global_state(struct intel_atomic_state *state);
+
 struct intel_crtc_state *
 intel_atomic_get_crtc_state(struct drm_atomic_state *state,
 			    struct intel_crtc *crtc);
diff --git a/drivers/gpu/drm/i915/display/intel_bw.c b/drivers/gpu/drm/i915/display/intel_bw.c
index 22e83f857de8..60249d9776d1 100644
--- a/drivers/gpu/drm/i915/display/intel_bw.c
+++ b/drivers/gpu/drm/i915/display/intel_bw.c
@@ -8,14 +8,20 @@
 #include "intel_bw.h"
 #include "intel_display_types.h"
 #include "intel_sideband.h"
+#include "intel_atomic.h"
+#include "intel_pm.h"
 
 /* Parameters for Qclk Geyserville (QGV) */
 struct intel_qgv_point {
 	u16 dclk, t_rp, t_rdpre, t_rc, t_ras, t_rcd;
 };
 
+
+/* BSpec precisely defines this */
+#define NUM_SAGV_POINTS 4
+
 struct intel_qgv_info {
-	struct intel_qgv_point points[3];
+	struct intel_qgv_point points[NUM_SAGV_POINTS];
 	u8 num_points;
 	u8 num_channels;
 	u8 t_bl;
@@ -113,6 +119,27 @@ static int icl_pcode_read_qgv_point_info(struct drm_i915_private *dev_priv,
 	return 0;
 }
 
+int icl_pcode_restrict_qgv_points(struct drm_i915_private *dev_priv,
+				  u32 points_mask)
+{
+	int ret;
+
+	/* bspec says to keep retrying for at least 1 ms */
+	ret = skl_pcode_request(dev_priv, ICL_PCODE_SAGV_DE_MEM_SS_CONFIG,
+				points_mask,
+				GEN11_PCODE_POINTS_RESTRICTED_MASK,
+				GEN11_PCODE_POINTS_RESTRICTED,
+				1);
+
+	if (ret < 0) {
+		DRM_ERROR("Failed to disable qgv points (%d)\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+
 static int icl_get_qgv_points(struct drm_i915_private *dev_priv,
 			      struct intel_qgv_info *qi)
 {
@@ -270,22 +297,6 @@ void intel_bw_init_hw(struct drm_i915_private *dev_priv)
 		icl_get_bw_info(dev_priv, &icl_sa_info);
 }
 
-static unsigned int intel_max_data_rate(struct drm_i915_private *dev_priv,
-					int num_planes)
-{
-	if (INTEL_GEN(dev_priv) >= 11)
-		/*
-		 * FIXME with SAGV disabled maybe we can assume
-		 * point 1 will always be used? Seems to match
-		 * the behaviour observed in the wild.
-		 */
-		return min3(icl_max_bw(dev_priv, num_planes, 0),
-			    icl_max_bw(dev_priv, num_planes, 1),
-			    icl_max_bw(dev_priv, num_planes, 2));
-	else
-		return UINT_MAX;
-}
-
 static unsigned int intel_bw_crtc_num_active_planes(const struct intel_crtc_state *crtc_state)
 {
 	/*
@@ -377,7 +388,10 @@ int intel_bw_atomic_check(struct intel_atomic_state *state)
 	unsigned int data_rate, max_data_rate;
 	unsigned int num_active_planes;
 	struct intel_crtc *crtc;
-	int i;
+	int i, ret;
+	struct intel_qgv_info qi = {};
+	u32 allowed_points = 0;
+	unsigned int max_bw_point = 0, max_bw = 0;
 
 	/* FIXME earlier gens need some checks too */
 	if (INTEL_GEN(dev_priv) < 11)
@@ -421,16 +435,67 @@ int intel_bw_atomic_check(struct intel_atomic_state *state)
 	data_rate = intel_bw_data_rate(dev_priv, bw_state);
 	num_active_planes = intel_bw_num_active_planes(dev_priv, bw_state);
 
-	max_data_rate = intel_max_data_rate(dev_priv, num_active_planes);
-
 	data_rate = DIV_ROUND_UP(data_rate, 1000);
 
-	if (data_rate > max_data_rate) {
-		DRM_DEBUG_KMS("Bandwidth %u MB/s exceeds max available %d MB/s (%d active planes)\n",
-			      data_rate, max_data_rate, num_active_planes);
+	ret = icl_get_qgv_points(dev_priv, &qi);
+	if (ret < 0)
+		return 0;
+
+	for (i = 0; i < qi.num_points; i++) {
+		max_data_rate = icl_max_bw(dev_priv, num_active_planes, i);
+		/*
+		 * We need to know which qgv point gives us
+		 * maximum bandwidth in order to disable SAGV
+		 * if we find that we exceed SAGV block time
+		 * with watermarks. By that moment we already
+		 * have those, as it is calculated earlier in
+		 * intel_atomic_check,
+		 */
+		if (max_data_rate > max_bw) {
+			max_bw_point = i;
+			max_bw = max_data_rate;
+		}
+		if (max_data_rate >= data_rate)
+			allowed_points |= 1 << i;
+		DRM_DEBUG_KMS("QGV point %d: max bw %d required %d\n",
+			      i, max_data_rate, data_rate);
+	}
+
+	/*
+	 * BSpec states that we always should have at least one allowed point
+	 * left, so if we couldn't - simply reject the configuration for obvious
+	 * reasons.
+	 */
+	if (allowed_points == 0) {
+		DRM_DEBUG_KMS("Could not find any suitable QGV points\n");
 		return -EINVAL;
 	}
 
+	/*
+	 * Leave only single point with highest bandwidth, if
+	 * we can't enable SAGV according to BSpec.
+	 */
+	if (!intel_can_enable_sagv(state))
+		allowed_points = 1 << max_bw_point;
+
+	/*
+	 * We store the ones which need to be masked as that is what PCode
+	 * actually accepts as a parameter.
+	 */
+	state->qgv_points_mask = (~allowed_points) & ((1 << qi.num_points) - 1);
+
+	/*
+	 * If the actual mask had changed we need to make sure that
+	 * the commits are serialized(in case this is a nomodeset, nonblocking)
+	 */
+	if (state->qgv_points_mask != dev_priv->qgv_points_mask) {
+		ret = intel_atomic_serialize_global_state(state);
+		if (ret) {
+			DRM_DEBUG_KMS("Could not serialize global state\n");
+			return ret;
+		}
+	}
+
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/i915/display/intel_bw.h b/drivers/gpu/drm/i915/display/intel_bw.h
index 9db10af012f4..66bf9bc10b73 100644
--- a/drivers/gpu/drm/i915/display/intel_bw.h
+++ b/drivers/gpu/drm/i915/display/intel_bw.h
@@ -28,5 +28,7 @@ int intel_bw_init(struct drm_i915_private *dev_priv);
 int intel_bw_atomic_check(struct intel_atomic_state *state);
 void intel_bw_crtc_update(struct intel_bw_state *bw_state,
 			  const struct intel_crtc_state *crtc_state);
+int icl_pcode_restrict_qgv_points(struct drm_i915_private *dev_priv,
+				  u32 points_mask);
 
 #endif /* __INTEL_BW_H__ */
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 236fdf122e47..2def37615586 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -14471,6 +14471,48 @@ static void intel_atomic_cleanup_work(struct work_struct *work)
 	intel_atomic_helper_free_state(i915);
 }
 
+static void intel_qgv_points_mask(struct intel_atomic_state *state)
+{
+	struct drm_device *dev = state->base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	int ret;
+	u32 new_mask = dev_priv->qgv_points_mask | state->qgv_points_mask;
+
+	/*
+	 * Restrict required qgv points before updating the configuration.
+	 * According to BSpec we can't mask and unmask qgv points at the same
+	 * time. Also masking should be done before updating the configuration
+	 * and unmasking afterwards.
+	 */
+	ret = icl_pcode_restrict_qgv_points(dev_priv, new_mask);
+	if (ret < 0)
+		DRM_DEBUG_KMS("Could not restrict required qgv points(%d)\n",
+			      ret);
+	else
+		dev_priv->qgv_points_mask = new_mask;
+}
+
+static void intel_qgv_points_unmask(struct intel_atomic_state *state)
+{
+	struct drm_device *dev = state->base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	int ret;
+	u32 new_mask = dev_priv->qgv_points_mask & state->qgv_points_mask;
+
+	/*
+	 * Allow required qgv points after updating the configuration.
+	 * According to BSpec we can't mask and unmask qgv points at the same
+	 * time. Also masking should be done before updating the configuration
+	 * and unmasking afterwards.
+	 */
+	ret = icl_pcode_restrict_qgv_points(dev_priv, new_mask);
+	if (ret < 0)
+		DRM_DEBUG_KMS("Could not restrict required qgv points(%d)\n",
+			      ret);
+	else
+		dev_priv->qgv_points_mask = new_mask;
+}
+
 static void intel_atomic_commit_tail(struct intel_atomic_state *state)
 {
 	struct drm_device *dev = state->base.dev;
@@ -14498,6 +14540,9 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
 		}
 	}
 
+	if ((INTEL_GEN(dev_priv) >= 11))
+		intel_qgv_points_mask(state);
+
 	intel_commit_modeset_disables(state);
 
 	/* FIXME: Eventually get rid of our crtc->config pointer */
@@ -14516,8 +14561,9 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
 		 * SKL workaround: bspec recommends we disable the SAGV when we
 		 * have more then one pipe enabled
 		 */
-		if (!intel_can_enable_sagv(state))
-			intel_disable_sagv(dev_priv);
+		if (INTEL_GEN(dev_priv) < 11)
+			if (!intel_can_enable_sagv(state))
+				intel_disable_sagv(dev_priv);
 
 		intel_modeset_verify_disabled(dev_priv, state);
 	}
@@ -14595,8 +14641,11 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
 	if (state->modeset)
 		intel_verify_planes(state);
 
-	if (state->modeset && intel_can_enable_sagv(state))
-		intel_enable_sagv(dev_priv);
+	if (INTEL_GEN(dev_priv) < 11) {
+		if (state->modeset && intel_can_enable_sagv(state))
+			intel_enable_sagv(dev_priv);
+	} else
+		intel_qgv_points_unmask(state);
 
 	drm_atomic_helper_commit_hw_done(&state->base);
 
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index f09c80c96470..0ef7351cc838 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -519,6 +519,9 @@ struct intel_atomic_state {
 	struct i915_sw_fence commit_ready;
 
 	struct llist_node freed;
+
+	/* Gen11+ only */
+	u32 qgv_points_mask;
 };
 
 struct intel_plane_state {
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 8882c0908c3b..cec10cf99e71 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1327,6 +1327,8 @@ struct drm_i915_private {
 		u8 num_planes;
 	} max_bw[6];
 
+	u32 qgv_points_mask;
+
 	struct drm_private_obj bw_obj;
 
 	struct intel_runtime_pm runtime_pm;
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 855db888516c..93823443036f 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -8858,6 +8858,8 @@ enum {
 #define     GEN6_PCODE_UNIMPLEMENTED_CMD	0xFF
 #define     GEN7_PCODE_TIMEOUT			0x2
 #define     GEN7_PCODE_ILLEGAL_DATA		0x3
+#define     GEN11_PCODE_MAIL_BOX_LOCKED		0x6
+#define     GEN11_PCODE_REJECTED		0x11
 #define     GEN7_PCODE_MIN_FREQ_TABLE_GT_RATIO_OUT_OF_RANGE 0x10
 #define   GEN6_PCODE_WRITE_RC6VIDS		0x4
 #define   GEN6_PCODE_READ_RC6VIDS		0x5
@@ -8879,6 +8881,7 @@ enum {
 #define   ICL_PCODE_MEM_SUBSYSYSTEM_INFO	0xd
 #define     ICL_PCODE_MEM_SS_READ_GLOBAL_INFO	(0x0 << 8)
 #define     ICL_PCODE_MEM_SS_READ_QGV_POINT_INFO(point)	(((point) << 16) | (0x1 << 8))
+#define   ICL_PCODE_SAGV_DE_MEM_SS_CONFIG	0xe
 #define   GEN6_PCODE_READ_D_COMP		0x10
 #define   GEN6_PCODE_WRITE_D_COMP		0x11
 #define   HSW_PCODE_DE_WRITE_FREQ_REQ		0x17
@@ -8891,6 +8894,8 @@ enum {
 #define     GEN9_SAGV_IS_DISABLED		0x1
 #define     GEN9_SAGV_ENABLE			0x3
 #define GEN12_PCODE_READ_SAGV_BLOCK_TIME_US	0x23
+#define GEN11_PCODE_POINTS_RESTRICTED		0x0
+#define GEN11_PCODE_POINTS_RESTRICTED_MASK	0x1
 #define GEN6_PCODE_DATA				_MMIO(0x138128)
 #define   GEN6_PCODE_FREQ_IA_RATIO_SHIFT	8
 #define   GEN6_PCODE_FREQ_RING_RATIO_SHIFT	16
diff --git a/drivers/gpu/drm/i915/intel_sideband.c b/drivers/gpu/drm/i915/intel_sideband.c
index e06b35b844a0..ff9dbed094d8 100644
--- a/drivers/gpu/drm/i915/intel_sideband.c
+++ b/drivers/gpu/drm/i915/intel_sideband.c
@@ -371,6 +371,29 @@ static inline int gen7_check_mailbox_status(u32 mbox)
 	}
 }
 
+static inline int gen11_check_mailbox_status(u32 mbox)
+{
+	switch (mbox & GEN6_PCODE_ERROR_MASK) {
+	case GEN6_PCODE_SUCCESS:
+		return 0;
+	case GEN6_PCODE_ILLEGAL_CMD:
+		return -ENXIO;
+	case GEN7_PCODE_TIMEOUT:
+		return -ETIMEDOUT;
+	case GEN7_PCODE_ILLEGAL_DATA:
+		return -EINVAL;
+	case GEN7_PCODE_MIN_FREQ_TABLE_GT_RATIO_OUT_OF_RANGE:
+		return -EOVERFLOW;
+	case GEN11_PCODE_MAIL_BOX_LOCKED:
+		return -EAGAIN;
+	case GEN11_PCODE_REJECTED:
+		return -EACCES;
+	default:
+		MISSING_CASE(mbox & GEN6_PCODE_ERROR_MASK);
+		return 0;
+	}
+}
+
 static int __sandybridge_pcode_rw(struct drm_i915_private *i915,
 				  u32 mbox, u32 *val, u32 *val1,
 				  int fast_timeout_us,
@@ -408,7 +431,9 @@ static int __sandybridge_pcode_rw(struct drm_i915_private *i915,
 	if (is_read && val1)
 		*val1 = intel_uncore_read_fw(uncore, GEN6_PCODE_DATA1);
 
-	if (INTEL_GEN(i915) > 6)
+	if (INTEL_GEN(i915) >= 11)
+		return gen11_check_mailbox_status(mbox);
+	else if (INTEL_GEN(i915) > 6)
 		return gen7_check_mailbox_status(mbox);
 	else
 		return gen6_check_mailbox_status(mbox);
-- 
2.17.1

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

[Intel-gfx] [PATCH v8 2/2] drm/i915: Restrict qgv points which don't have enough bandwidth.

[Stanislav Lisovskiy]

According to BSpec 53998, we should try to
restrict qgv points, which can't provide
enough bandwidth for desired display configuration.

Currently we are just comparing against all of
those and take minimum(worst case).

v2: Fixed wrong PCode reply mask, removed hardcoded
    values.

v3: Forbid simultaneous legacy SAGV PCode requests and
    restricting qgv points. Put the actual restriction
    to commit function, added serialization(thanks to Ville)
    to prevent commit being applied out of order in case of
    nonblocking and/or nomodeset commits.

v4:
    - Minor code refactoring, fixed few typos(thanks to James Ausmus)
    - Change the naming of qgv point
      masking/unmasking functions(James Ausmus).
    - Simplify the masking/unmasking operation itself,
      as we don't need to mask only single point per request(James Ausmus)
    - Reject and stick to highest bandwidth point if SAGV
      can't be enabled(BSpec)

v5:
    - Add new mailbox reply codes, which seems to happen during boot
      time for TGL and indicate that QGV setting is not yet available.

v6:
    - Increase number of supported QGV points to be in sync with BSpec.

Reviewed-by: James Ausmus <james.ausmus@intel.com>
Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Cc: Ville Syrjälä <ville.syrjala@intel.com>
Cc: James Ausmus <james.ausmus@intel.com>
---
 drivers/gpu/drm/i915/display/intel_atomic.c   |  16 +++
 drivers/gpu/drm/i915/display/intel_atomic.h   |   3 +
 drivers/gpu/drm/i915/display/intel_bw.c       | 111 ++++++++++++++----
 drivers/gpu/drm/i915/display/intel_bw.h       |   2 +
 drivers/gpu/drm/i915/display/intel_display.c  |  57 ++++++++-
 .../drm/i915/display/intel_display_types.h    |   3 +
 drivers/gpu/drm/i915/i915_drv.h               |   2 +
 drivers/gpu/drm/i915/i915_reg.h               |   5 +
 drivers/gpu/drm/i915/intel_sideband.c         |  27 ++++-
 9 files changed, 198 insertions(+), 28 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_atomic.c b/drivers/gpu/drm/i915/display/intel_atomic.c
index c5a552a69752..b3f4f02f380b 100644
--- a/drivers/gpu/drm/i915/display/intel_atomic.c
+++ b/drivers/gpu/drm/i915/display/intel_atomic.c
@@ -207,6 +207,22 @@ intel_crtc_duplicate_state(struct drm_crtc *crtc)
 	return &crtc_state->base;
 }
 
+int intel_atomic_serialize_global_state(struct intel_atomic_state *state)
+{
+	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
+	struct intel_crtc *crtc;
+
+	for_each_intel_crtc(&dev_priv->drm, crtc) {
+		struct intel_crtc_state *crtc_state;
+
+		crtc_state = intel_atomic_get_crtc_state(&state->base, crtc);
+		if (IS_ERR(crtc_state))
+			return PTR_ERR(crtc_state);
+	}
+
+	return 0;
+}
+
 /**
  * intel_crtc_destroy_state - destroy crtc state
  * @crtc: drm crtc
diff --git a/drivers/gpu/drm/i915/display/intel_atomic.h b/drivers/gpu/drm/i915/display/intel_atomic.h
index 58065d3161a3..fd17b3ca257f 100644
--- a/drivers/gpu/drm/i915/display/intel_atomic.h
+++ b/drivers/gpu/drm/i915/display/intel_atomic.h
@@ -7,6 +7,7 @@
 #define __INTEL_ATOMIC_H__
 
 #include <linux/types.h>
+#include "intel_display_types.h"
 
 struct drm_atomic_state;
 struct drm_connector;
@@ -38,6 +39,8 @@ void intel_crtc_destroy_state(struct drm_crtc *crtc,
 struct drm_atomic_state *intel_atomic_state_alloc(struct drm_device *dev);
 void intel_atomic_state_clear(struct drm_atomic_state *state);
 
+int intel_atomic_serialize_global_state(struct intel_atomic_state *state);
+
 struct intel_crtc_state *
 intel_atomic_get_crtc_state(struct drm_atomic_state *state,
 			    struct intel_crtc *crtc);
diff --git a/drivers/gpu/drm/i915/display/intel_bw.c b/drivers/gpu/drm/i915/display/intel_bw.c
index 22e83f857de8..60249d9776d1 100644
--- a/drivers/gpu/drm/i915/display/intel_bw.c
+++ b/drivers/gpu/drm/i915/display/intel_bw.c
@@ -8,14 +8,20 @@
 #include "intel_bw.h"
 #include "intel_display_types.h"
 #include "intel_sideband.h"
+#include "intel_atomic.h"
+#include "intel_pm.h"
 
 /* Parameters for Qclk Geyserville (QGV) */
 struct intel_qgv_point {
 	u16 dclk, t_rp, t_rdpre, t_rc, t_ras, t_rcd;
 };
 
+
+/* BSpec precisely defines this */
+#define NUM_SAGV_POINTS 4
+
 struct intel_qgv_info {
-	struct intel_qgv_point points[3];
+	struct intel_qgv_point points[NUM_SAGV_POINTS];
 	u8 num_points;
 	u8 num_channels;
 	u8 t_bl;
@@ -113,6 +119,27 @@ static int icl_pcode_read_qgv_point_info(struct drm_i915_private *dev_priv,
 	return 0;
 }
 
+int icl_pcode_restrict_qgv_points(struct drm_i915_private *dev_priv,
+				  u32 points_mask)
+{
+	int ret;
+
+	/* bspec says to keep retrying for at least 1 ms */
+	ret = skl_pcode_request(dev_priv, ICL_PCODE_SAGV_DE_MEM_SS_CONFIG,
+				points_mask,
+				GEN11_PCODE_POINTS_RESTRICTED_MASK,
+				GEN11_PCODE_POINTS_RESTRICTED,
+				1);
+
+	if (ret < 0) {
+		DRM_ERROR("Failed to disable qgv points (%d)\n", ret);
+		return ret;
+	}
+
+	return 0;
+}
+
+
 static int icl_get_qgv_points(struct drm_i915_private *dev_priv,
 			      struct intel_qgv_info *qi)
 {
@@ -270,22 +297,6 @@ void intel_bw_init_hw(struct drm_i915_private *dev_priv)
 		icl_get_bw_info(dev_priv, &icl_sa_info);
 }
 
-static unsigned int intel_max_data_rate(struct drm_i915_private *dev_priv,
-					int num_planes)
-{
-	if (INTEL_GEN(dev_priv) >= 11)
-		/*
-		 * FIXME with SAGV disabled maybe we can assume
-		 * point 1 will always be used? Seems to match
-		 * the behaviour observed in the wild.
-		 */
-		return min3(icl_max_bw(dev_priv, num_planes, 0),
-			    icl_max_bw(dev_priv, num_planes, 1),
-			    icl_max_bw(dev_priv, num_planes, 2));
-	else
-		return UINT_MAX;
-}
-
 static unsigned int intel_bw_crtc_num_active_planes(const struct intel_crtc_state *crtc_state)
 {
 	/*
@@ -377,7 +388,10 @@ int intel_bw_atomic_check(struct intel_atomic_state *state)
 	unsigned int data_rate, max_data_rate;
 	unsigned int num_active_planes;
 	struct intel_crtc *crtc;
-	int i;
+	int i, ret;
+	struct intel_qgv_info qi = {};
+	u32 allowed_points = 0;
+	unsigned int max_bw_point = 0, max_bw = 0;
 
 	/* FIXME earlier gens need some checks too */
 	if (INTEL_GEN(dev_priv) < 11)
@@ -421,16 +435,67 @@ int intel_bw_atomic_check(struct intel_atomic_state *state)
 	data_rate = intel_bw_data_rate(dev_priv, bw_state);
 	num_active_planes = intel_bw_num_active_planes(dev_priv, bw_state);
 
-	max_data_rate = intel_max_data_rate(dev_priv, num_active_planes);
-
 	data_rate = DIV_ROUND_UP(data_rate, 1000);
 
-	if (data_rate > max_data_rate) {
-		DRM_DEBUG_KMS("Bandwidth %u MB/s exceeds max available %d MB/s (%d active planes)\n",
-			      data_rate, max_data_rate, num_active_planes);
+	ret = icl_get_qgv_points(dev_priv, &qi);
+	if (ret < 0)
+		return 0;
+
+	for (i = 0; i < qi.num_points; i++) {
+		max_data_rate = icl_max_bw(dev_priv, num_active_planes, i);
+		/*
+		 * We need to know which qgv point gives us
+		 * maximum bandwidth in order to disable SAGV
+		 * if we find that we exceed SAGV block time
+		 * with watermarks. By that moment we already
+		 * have those, as it is calculated earlier in
+		 * intel_atomic_check,
+		 */
+		if (max_data_rate > max_bw) {
+			max_bw_point = i;
+			max_bw = max_data_rate;
+		}
+		if (max_data_rate >= data_rate)
+			allowed_points |= 1 << i;
+		DRM_DEBUG_KMS("QGV point %d: max bw %d required %d\n",
+			      i, max_data_rate, data_rate);
+	}
+
+	/*
+	 * BSpec states that we always should have at least one allowed point
+	 * left, so if we couldn't - simply reject the configuration for obvious
+	 * reasons.
+	 */
+	if (allowed_points == 0) {
+		DRM_DEBUG_KMS("Could not find any suitable QGV points\n");
 		return -EINVAL;
 	}
 
+	/*
+	 * Leave only single point with highest bandwidth, if
+	 * we can't enable SAGV according to BSpec.
+	 */
+	if (!intel_can_enable_sagv(state))
+		allowed_points = 1 << max_bw_point;
+
+	/*
+	 * We store the ones which need to be masked as that is what PCode
+	 * actually accepts as a parameter.
+	 */
+	state->qgv_points_mask = (~allowed_points) & ((1 << qi.num_points) - 1);
+
+	/*
+	 * If the actual mask had changed we need to make sure that
+	 * the commits are serialized(in case this is a nomodeset, nonblocking)
+	 */
+	if (state->qgv_points_mask != dev_priv->qgv_points_mask) {
+		ret = intel_atomic_serialize_global_state(state);
+		if (ret) {
+			DRM_DEBUG_KMS("Could not serialize global state\n");
+			return ret;
+		}
+	}
+
 	return 0;
 }
 
diff --git a/drivers/gpu/drm/i915/display/intel_bw.h b/drivers/gpu/drm/i915/display/intel_bw.h
index 9db10af012f4..66bf9bc10b73 100644
--- a/drivers/gpu/drm/i915/display/intel_bw.h
+++ b/drivers/gpu/drm/i915/display/intel_bw.h
@@ -28,5 +28,7 @@ int intel_bw_init(struct drm_i915_private *dev_priv);
 int intel_bw_atomic_check(struct intel_atomic_state *state);
 void intel_bw_crtc_update(struct intel_bw_state *bw_state,
 			  const struct intel_crtc_state *crtc_state);
+int icl_pcode_restrict_qgv_points(struct drm_i915_private *dev_priv,
+				  u32 points_mask);
 
 #endif /* __INTEL_BW_H__ */
diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 236fdf122e47..2def37615586 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -14471,6 +14471,48 @@ static void intel_atomic_cleanup_work(struct work_struct *work)
 	intel_atomic_helper_free_state(i915);
 }
 
+static void intel_qgv_points_mask(struct intel_atomic_state *state)
+{
+	struct drm_device *dev = state->base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	int ret;
+	u32 new_mask = dev_priv->qgv_points_mask | state->qgv_points_mask;
+
+	/*
+	 * Restrict required qgv points before updating the configuration.
+	 * According to BSpec we can't mask and unmask qgv points at the same
+	 * time. Also masking should be done before updating the configuration
+	 * and unmasking afterwards.
+	 */
+	ret = icl_pcode_restrict_qgv_points(dev_priv, new_mask);
+	if (ret < 0)
+		DRM_DEBUG_KMS("Could not restrict required qgv points(%d)\n",
+			      ret);
+	else
+		dev_priv->qgv_points_mask = new_mask;
+}
+
+static void intel_qgv_points_unmask(struct intel_atomic_state *state)
+{
+	struct drm_device *dev = state->base.dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	int ret;
+	u32 new_mask = dev_priv->qgv_points_mask & state->qgv_points_mask;
+
+	/*
+	 * Allow required qgv points after updating the configuration.
+	 * According to BSpec we can't mask and unmask qgv points at the same
+	 * time. Also masking should be done before updating the configuration
+	 * and unmasking afterwards.
+	 */
+	ret = icl_pcode_restrict_qgv_points(dev_priv, new_mask);
+	if (ret < 0)
+		DRM_DEBUG_KMS("Could not restrict required qgv points(%d)\n",
+			      ret);
+	else
+		dev_priv->qgv_points_mask = new_mask;
+}
+
 static void intel_atomic_commit_tail(struct intel_atomic_state *state)
 {
 	struct drm_device *dev = state->base.dev;
@@ -14498,6 +14540,9 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
 		}
 	}
 
+	if ((INTEL_GEN(dev_priv) >= 11))
+		intel_qgv_points_mask(state);
+
 	intel_commit_modeset_disables(state);
 
 	/* FIXME: Eventually get rid of our crtc->config pointer */
@@ -14516,8 +14561,9 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
 		 * SKL workaround: bspec recommends we disable the SAGV when we
 		 * have more then one pipe enabled
 		 */
-		if (!intel_can_enable_sagv(state))
-			intel_disable_sagv(dev_priv);
+		if (INTEL_GEN(dev_priv) < 11)
+			if (!intel_can_enable_sagv(state))
+				intel_disable_sagv(dev_priv);
 
 		intel_modeset_verify_disabled(dev_priv, state);
 	}
@@ -14595,8 +14641,11 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
 	if (state->modeset)
 		intel_verify_planes(state);
 
-	if (state->modeset && intel_can_enable_sagv(state))
-		intel_enable_sagv(dev_priv);
+	if (INTEL_GEN(dev_priv) < 11) {
+		if (state->modeset && intel_can_enable_sagv(state))
+			intel_enable_sagv(dev_priv);
+	} else
+		intel_qgv_points_unmask(state);
 
 	drm_atomic_helper_commit_hw_done(&state->base);
 
diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
index f09c80c96470..0ef7351cc838 100644
--- a/drivers/gpu/drm/i915/display/intel_display_types.h
+++ b/drivers/gpu/drm/i915/display/intel_display_types.h
@@ -519,6 +519,9 @@ struct intel_atomic_state {
 	struct i915_sw_fence commit_ready;
 
 	struct llist_node freed;
+
+	/* Gen11+ only */
+	u32 qgv_points_mask;
 };
 
 struct intel_plane_state {
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 8882c0908c3b..cec10cf99e71 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1327,6 +1327,8 @@ struct drm_i915_private {
 		u8 num_planes;
 	} max_bw[6];
 
+	u32 qgv_points_mask;
+
 	struct drm_private_obj bw_obj;
 
 	struct intel_runtime_pm runtime_pm;
diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 855db888516c..93823443036f 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -8858,6 +8858,8 @@ enum {
 #define     GEN6_PCODE_UNIMPLEMENTED_CMD	0xFF
 #define     GEN7_PCODE_TIMEOUT			0x2
 #define     GEN7_PCODE_ILLEGAL_DATA		0x3
+#define     GEN11_PCODE_MAIL_BOX_LOCKED		0x6
+#define     GEN11_PCODE_REJECTED		0x11
 #define     GEN7_PCODE_MIN_FREQ_TABLE_GT_RATIO_OUT_OF_RANGE 0x10
 #define   GEN6_PCODE_WRITE_RC6VIDS		0x4
 #define   GEN6_PCODE_READ_RC6VIDS		0x5
@@ -8879,6 +8881,7 @@ enum {
 #define   ICL_PCODE_MEM_SUBSYSYSTEM_INFO	0xd
 #define     ICL_PCODE_MEM_SS_READ_GLOBAL_INFO	(0x0 << 8)
 #define     ICL_PCODE_MEM_SS_READ_QGV_POINT_INFO(point)	(((point) << 16) | (0x1 << 8))
+#define   ICL_PCODE_SAGV_DE_MEM_SS_CONFIG	0xe
 #define   GEN6_PCODE_READ_D_COMP		0x10
 #define   GEN6_PCODE_WRITE_D_COMP		0x11
 #define   HSW_PCODE_DE_WRITE_FREQ_REQ		0x17
@@ -8891,6 +8894,8 @@ enum {
 #define     GEN9_SAGV_IS_DISABLED		0x1
 #define     GEN9_SAGV_ENABLE			0x3
 #define GEN12_PCODE_READ_SAGV_BLOCK_TIME_US	0x23
+#define GEN11_PCODE_POINTS_RESTRICTED		0x0
+#define GEN11_PCODE_POINTS_RESTRICTED_MASK	0x1
 #define GEN6_PCODE_DATA				_MMIO(0x138128)
 #define   GEN6_PCODE_FREQ_IA_RATIO_SHIFT	8
 #define   GEN6_PCODE_FREQ_RING_RATIO_SHIFT	16
diff --git a/drivers/gpu/drm/i915/intel_sideband.c b/drivers/gpu/drm/i915/intel_sideband.c
index e06b35b844a0..ff9dbed094d8 100644
--- a/drivers/gpu/drm/i915/intel_sideband.c
+++ b/drivers/gpu/drm/i915/intel_sideband.c
@@ -371,6 +371,29 @@ static inline int gen7_check_mailbox_status(u32 mbox)
 	}
 }
 
+static inline int gen11_check_mailbox_status(u32 mbox)
+{
+	switch (mbox & GEN6_PCODE_ERROR_MASK) {
+	case GEN6_PCODE_SUCCESS:
+		return 0;
+	case GEN6_PCODE_ILLEGAL_CMD:
+		return -ENXIO;
+	case GEN7_PCODE_TIMEOUT:
+		return -ETIMEDOUT;
+	case GEN7_PCODE_ILLEGAL_DATA:
+		return -EINVAL;
+	case GEN7_PCODE_MIN_FREQ_TABLE_GT_RATIO_OUT_OF_RANGE:
+		return -EOVERFLOW;
+	case GEN11_PCODE_MAIL_BOX_LOCKED:
+		return -EAGAIN;
+	case GEN11_PCODE_REJECTED:
+		return -EACCES;
+	default:
+		MISSING_CASE(mbox & GEN6_PCODE_ERROR_MASK);
+		return 0;
+	}
+}
+
 static int __sandybridge_pcode_rw(struct drm_i915_private *i915,
 				  u32 mbox, u32 *val, u32 *val1,
 				  int fast_timeout_us,
@@ -408,7 +431,9 @@ static int __sandybridge_pcode_rw(struct drm_i915_private *i915,
 	if (is_read && val1)
 		*val1 = intel_uncore_read_fw(uncore, GEN6_PCODE_DATA1);
 
-	if (INTEL_GEN(i915) > 6)
+	if (INTEL_GEN(i915) >= 11)
+		return gen11_check_mailbox_status(mbox);
+	else if (INTEL_GEN(i915) > 6)
 		return gen7_check_mailbox_status(mbox);
 	else
 		return gen6_check_mailbox_status(mbox);
-- 
2.17.1

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [PATCH v8 2/2] drm/i915: Restrict qgv points which don't have enough bandwidth.

[James Ausmus]

On Fri, Oct 25, 2019 at 12:53:52PM +0300, Stanislav Lisovskiy wrote:
> According to BSpec 53998, we should try to
> restrict qgv points, which can't provide
> enough bandwidth for desired display configuration.
> 
> Currently we are just comparing against all of
> those and take minimum(worst case).
> 
> v2: Fixed wrong PCode reply mask, removed hardcoded
>     values.
> 
> v3: Forbid simultaneous legacy SAGV PCode requests and
>     restricting qgv points. Put the actual restriction
>     to commit function, added serialization(thanks to Ville)
>     to prevent commit being applied out of order in case of
>     nonblocking and/or nomodeset commits.
> 
> v4:
>     - Minor code refactoring, fixed few typos(thanks to James Ausmus)
>     - Change the naming of qgv point
>       masking/unmasking functions(James Ausmus).
>     - Simplify the masking/unmasking operation itself,
>       as we don't need to mask only single point per request(James Ausmus)
>     - Reject and stick to highest bandwidth point if SAGV
>       can't be enabled(BSpec)
> 
> v5:
>     - Add new mailbox reply codes, which seems to happen during boot
>       time for TGL and indicate that QGV setting is not yet available.
> 
> v6:
>     - Increase number of supported QGV points to be in sync with BSpec.
> 
> Reviewed-by: James Ausmus <james.ausmus@intel.com>
> Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
> Cc: Ville Syrjälä <ville.syrjala@intel.com>
> Cc: James Ausmus <james.ausmus@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_atomic.c   |  16 +++
>  drivers/gpu/drm/i915/display/intel_atomic.h   |   3 +
>  drivers/gpu/drm/i915/display/intel_bw.c       | 111 ++++++++++++++----
>  drivers/gpu/drm/i915/display/intel_bw.h       |   2 +
>  drivers/gpu/drm/i915/display/intel_display.c  |  57 ++++++++-
>  .../drm/i915/display/intel_display_types.h    |   3 +
>  drivers/gpu/drm/i915/i915_drv.h               |   2 +
>  drivers/gpu/drm/i915/i915_reg.h               |   5 +
>  drivers/gpu/drm/i915/intel_sideband.c         |  27 ++++-
>  9 files changed, 198 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_atomic.c b/drivers/gpu/drm/i915/display/intel_atomic.c
> index c5a552a69752..b3f4f02f380b 100644
> --- a/drivers/gpu/drm/i915/display/intel_atomic.c
> +++ b/drivers/gpu/drm/i915/display/intel_atomic.c
> @@ -207,6 +207,22 @@ intel_crtc_duplicate_state(struct drm_crtc *crtc)
>  	return &crtc_state->base;
>  }
>  
> +int intel_atomic_serialize_global_state(struct intel_atomic_state *state)
> +{
> +	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
> +	struct intel_crtc *crtc;
> +
> +	for_each_intel_crtc(&dev_priv->drm, crtc) {
> +		struct intel_crtc_state *crtc_state;
> +
> +		crtc_state = intel_atomic_get_crtc_state(&state->base, crtc);
> +		if (IS_ERR(crtc_state))
> +			return PTR_ERR(crtc_state);
> +	}
> +
> +	return 0;
> +}
> +
>  /**
>   * intel_crtc_destroy_state - destroy crtc state
>   * @crtc: drm crtc
> diff --git a/drivers/gpu/drm/i915/display/intel_atomic.h b/drivers/gpu/drm/i915/display/intel_atomic.h
> index 58065d3161a3..fd17b3ca257f 100644
> --- a/drivers/gpu/drm/i915/display/intel_atomic.h
> +++ b/drivers/gpu/drm/i915/display/intel_atomic.h
> @@ -7,6 +7,7 @@
>  #define __INTEL_ATOMIC_H__
>  
>  #include <linux/types.h>
> +#include "intel_display_types.h"
>  
>  struct drm_atomic_state;
>  struct drm_connector;
> @@ -38,6 +39,8 @@ void intel_crtc_destroy_state(struct drm_crtc *crtc,
>  struct drm_atomic_state *intel_atomic_state_alloc(struct drm_device *dev);
>  void intel_atomic_state_clear(struct drm_atomic_state *state);
>  
> +int intel_atomic_serialize_global_state(struct intel_atomic_state *state);
> +
>  struct intel_crtc_state *
>  intel_atomic_get_crtc_state(struct drm_atomic_state *state,
>  			    struct intel_crtc *crtc);
> diff --git a/drivers/gpu/drm/i915/display/intel_bw.c b/drivers/gpu/drm/i915/display/intel_bw.c
> index 22e83f857de8..60249d9776d1 100644
> --- a/drivers/gpu/drm/i915/display/intel_bw.c
> +++ b/drivers/gpu/drm/i915/display/intel_bw.c
> @@ -8,14 +8,20 @@
>  #include "intel_bw.h"
>  #include "intel_display_types.h"
>  #include "intel_sideband.h"
> +#include "intel_atomic.h"
> +#include "intel_pm.h"
>  
>  /* Parameters for Qclk Geyserville (QGV) */
>  struct intel_qgv_point {
>  	u16 dclk, t_rp, t_rdpre, t_rc, t_ras, t_rcd;
>  };
>  
> +
> +/* BSpec precisely defines this */
> +#define NUM_SAGV_POINTS 4

Shouldn't this be defined in intel_bw.h?

From what I'm seeing in BSpec 53998 (Gen12), in the
MAILBOX_GTDRIVER_CMD_SAGV_DE_MEM_SS_CONFIG section, there can be 8
points (even though the pseudo-code a couple of sections later defines
it as 4), and it looks like BSpec 54023 (Gen11) has the same bit
defines. I think I trust the bit defines more than the pseudo-code :)

With the above fixed, my R-b from version applies to this version.

Thanks!

-James

> +
>  struct intel_qgv_info {
> -	struct intel_qgv_point points[3];
> +	struct intel_qgv_point points[NUM_SAGV_POINTS];
>  	u8 num_points;
>  	u8 num_channels;
>  	u8 t_bl;
> @@ -113,6 +119,27 @@ static int icl_pcode_read_qgv_point_info(struct drm_i915_private *dev_priv,
>  	return 0;
>  }
>  
> +int icl_pcode_restrict_qgv_points(struct drm_i915_private *dev_priv,
> +				  u32 points_mask)
> +{
> +	int ret;
> +
> +	/* bspec says to keep retrying for at least 1 ms */
> +	ret = skl_pcode_request(dev_priv, ICL_PCODE_SAGV_DE_MEM_SS_CONFIG,
> +				points_mask,
> +				GEN11_PCODE_POINTS_RESTRICTED_MASK,
> +				GEN11_PCODE_POINTS_RESTRICTED,
> +				1);
> +
> +	if (ret < 0) {
> +		DRM_ERROR("Failed to disable qgv points (%d)\n", ret);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +
>  static int icl_get_qgv_points(struct drm_i915_private *dev_priv,
>  			      struct intel_qgv_info *qi)
>  {
> @@ -270,22 +297,6 @@ void intel_bw_init_hw(struct drm_i915_private *dev_priv)
>  		icl_get_bw_info(dev_priv, &icl_sa_info);
>  }
>  
> -static unsigned int intel_max_data_rate(struct drm_i915_private *dev_priv,
> -					int num_planes)
> -{
> -	if (INTEL_GEN(dev_priv) >= 11)
> -		/*
> -		 * FIXME with SAGV disabled maybe we can assume
> -		 * point 1 will always be used? Seems to match
> -		 * the behaviour observed in the wild.
> -		 */
> -		return min3(icl_max_bw(dev_priv, num_planes, 0),
> -			    icl_max_bw(dev_priv, num_planes, 1),
> -			    icl_max_bw(dev_priv, num_planes, 2));
> -	else
> -		return UINT_MAX;
> -}
> -
>  static unsigned int intel_bw_crtc_num_active_planes(const struct intel_crtc_state *crtc_state)
>  {
>  	/*
> @@ -377,7 +388,10 @@ int intel_bw_atomic_check(struct intel_atomic_state *state)
>  	unsigned int data_rate, max_data_rate;
>  	unsigned int num_active_planes;
>  	struct intel_crtc *crtc;
> -	int i;
> +	int i, ret;
> +	struct intel_qgv_info qi = {};
> +	u32 allowed_points = 0;
> +	unsigned int max_bw_point = 0, max_bw = 0;
>  
>  	/* FIXME earlier gens need some checks too */
>  	if (INTEL_GEN(dev_priv) < 11)
> @@ -421,16 +435,67 @@ int intel_bw_atomic_check(struct intel_atomic_state *state)
>  	data_rate = intel_bw_data_rate(dev_priv, bw_state);
>  	num_active_planes = intel_bw_num_active_planes(dev_priv, bw_state);
>  
> -	max_data_rate = intel_max_data_rate(dev_priv, num_active_planes);
> -
>  	data_rate = DIV_ROUND_UP(data_rate, 1000);
>  
> -	if (data_rate > max_data_rate) {
> -		DRM_DEBUG_KMS("Bandwidth %u MB/s exceeds max available %d MB/s (%d active planes)\n",
> -			      data_rate, max_data_rate, num_active_planes);
> +	ret = icl_get_qgv_points(dev_priv, &qi);
> +	if (ret < 0)
> +		return 0;
> +
> +	for (i = 0; i < qi.num_points; i++) {
> +		max_data_rate = icl_max_bw(dev_priv, num_active_planes, i);
> +		/*
> +		 * We need to know which qgv point gives us
> +		 * maximum bandwidth in order to disable SAGV
> +		 * if we find that we exceed SAGV block time
> +		 * with watermarks. By that moment we already
> +		 * have those, as it is calculated earlier in
> +		 * intel_atomic_check,
> +		 */
> +		if (max_data_rate > max_bw) {
> +			max_bw_point = i;
> +			max_bw = max_data_rate;
> +		}
> +		if (max_data_rate >= data_rate)
> +			allowed_points |= 1 << i;
> +		DRM_DEBUG_KMS("QGV point %d: max bw %d required %d\n",
> +			      i, max_data_rate, data_rate);
> +	}
> +
> +	/*
> +	 * BSpec states that we always should have at least one allowed point
> +	 * left, so if we couldn't - simply reject the configuration for obvious
> +	 * reasons.
> +	 */
> +	if (allowed_points == 0) {
> +		DRM_DEBUG_KMS("Could not find any suitable QGV points\n");
>  		return -EINVAL;
>  	}
>  
> +	/*
> +	 * Leave only single point with highest bandwidth, if
> +	 * we can't enable SAGV according to BSpec.
> +	 */
> +	if (!intel_can_enable_sagv(state))
> +		allowed_points = 1 << max_bw_point;
> +
> +	/*
> +	 * We store the ones which need to be masked as that is what PCode
> +	 * actually accepts as a parameter.
> +	 */
> +	state->qgv_points_mask = (~allowed_points) & ((1 << qi.num_points) - 1);
> +
> +	/*
> +	 * If the actual mask had changed we need to make sure that
> +	 * the commits are serialized(in case this is a nomodeset, nonblocking)
> +	 */
> +	if (state->qgv_points_mask != dev_priv->qgv_points_mask) {
> +		ret = intel_atomic_serialize_global_state(state);
> +		if (ret) {
> +			DRM_DEBUG_KMS("Could not serialize global state\n");
> +			return ret;
> +		}
> +	}
> +
>  	return 0;
>  }
>  
> diff --git a/drivers/gpu/drm/i915/display/intel_bw.h b/drivers/gpu/drm/i915/display/intel_bw.h
> index 9db10af012f4..66bf9bc10b73 100644
> --- a/drivers/gpu/drm/i915/display/intel_bw.h
> +++ b/drivers/gpu/drm/i915/display/intel_bw.h
> @@ -28,5 +28,7 @@ int intel_bw_init(struct drm_i915_private *dev_priv);
>  int intel_bw_atomic_check(struct intel_atomic_state *state);
>  void intel_bw_crtc_update(struct intel_bw_state *bw_state,
>  			  const struct intel_crtc_state *crtc_state);
> +int icl_pcode_restrict_qgv_points(struct drm_i915_private *dev_priv,
> +				  u32 points_mask);
>  
>  #endif /* __INTEL_BW_H__ */
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 236fdf122e47..2def37615586 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -14471,6 +14471,48 @@ static void intel_atomic_cleanup_work(struct work_struct *work)
>  	intel_atomic_helper_free_state(i915);
>  }
>  
> +static void intel_qgv_points_mask(struct intel_atomic_state *state)
> +{
> +	struct drm_device *dev = state->base.dev;
> +	struct drm_i915_private *dev_priv = to_i915(dev);
> +	int ret;
> +	u32 new_mask = dev_priv->qgv_points_mask | state->qgv_points_mask;
> +
> +	/*
> +	 * Restrict required qgv points before updating the configuration.
> +	 * According to BSpec we can't mask and unmask qgv points at the same
> +	 * time. Also masking should be done before updating the configuration
> +	 * and unmasking afterwards.
> +	 */
> +	ret = icl_pcode_restrict_qgv_points(dev_priv, new_mask);
> +	if (ret < 0)
> +		DRM_DEBUG_KMS("Could not restrict required qgv points(%d)\n",
> +			      ret);
> +	else
> +		dev_priv->qgv_points_mask = new_mask;
> +}
> +
> +static void intel_qgv_points_unmask(struct intel_atomic_state *state)
> +{
> +	struct drm_device *dev = state->base.dev;
> +	struct drm_i915_private *dev_priv = to_i915(dev);
> +	int ret;
> +	u32 new_mask = dev_priv->qgv_points_mask & state->qgv_points_mask;
> +
> +	/*
> +	 * Allow required qgv points after updating the configuration.
> +	 * According to BSpec we can't mask and unmask qgv points at the same
> +	 * time. Also masking should be done before updating the configuration
> +	 * and unmasking afterwards.
> +	 */
> +	ret = icl_pcode_restrict_qgv_points(dev_priv, new_mask);
> +	if (ret < 0)
> +		DRM_DEBUG_KMS("Could not restrict required qgv points(%d)\n",
> +			      ret);
> +	else
> +		dev_priv->qgv_points_mask = new_mask;
> +}
> +
>  static void intel_atomic_commit_tail(struct intel_atomic_state *state)
>  {
>  	struct drm_device *dev = state->base.dev;
> @@ -14498,6 +14540,9 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
>  		}
>  	}
>  
> +	if ((INTEL_GEN(dev_priv) >= 11))
> +		intel_qgv_points_mask(state);
> +
>  	intel_commit_modeset_disables(state);
>  
>  	/* FIXME: Eventually get rid of our crtc->config pointer */
> @@ -14516,8 +14561,9 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
>  		 * SKL workaround: bspec recommends we disable the SAGV when we
>  		 * have more then one pipe enabled
>  		 */
> -		if (!intel_can_enable_sagv(state))
> -			intel_disable_sagv(dev_priv);
> +		if (INTEL_GEN(dev_priv) < 11)
> +			if (!intel_can_enable_sagv(state))
> +				intel_disable_sagv(dev_priv);
>  
>  		intel_modeset_verify_disabled(dev_priv, state);
>  	}
> @@ -14595,8 +14641,11 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
>  	if (state->modeset)
>  		intel_verify_planes(state);
>  
> -	if (state->modeset && intel_can_enable_sagv(state))
> -		intel_enable_sagv(dev_priv);
> +	if (INTEL_GEN(dev_priv) < 11) {
> +		if (state->modeset && intel_can_enable_sagv(state))
> +			intel_enable_sagv(dev_priv);
> +	} else
> +		intel_qgv_points_unmask(state);
>  
>  	drm_atomic_helper_commit_hw_done(&state->base);
>  
> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
> index f09c80c96470..0ef7351cc838 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -519,6 +519,9 @@ struct intel_atomic_state {
>  	struct i915_sw_fence commit_ready;
>  
>  	struct llist_node freed;
> +
> +	/* Gen11+ only */
> +	u32 qgv_points_mask;
>  };
>  
>  struct intel_plane_state {
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 8882c0908c3b..cec10cf99e71 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1327,6 +1327,8 @@ struct drm_i915_private {
>  		u8 num_planes;
>  	} max_bw[6];
>  
> +	u32 qgv_points_mask;
> +
>  	struct drm_private_obj bw_obj;
>  
>  	struct intel_runtime_pm runtime_pm;
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 855db888516c..93823443036f 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -8858,6 +8858,8 @@ enum {
>  #define     GEN6_PCODE_UNIMPLEMENTED_CMD	0xFF
>  #define     GEN7_PCODE_TIMEOUT			0x2
>  #define     GEN7_PCODE_ILLEGAL_DATA		0x3
> +#define     GEN11_PCODE_MAIL_BOX_LOCKED		0x6
> +#define     GEN11_PCODE_REJECTED		0x11
>  #define     GEN7_PCODE_MIN_FREQ_TABLE_GT_RATIO_OUT_OF_RANGE 0x10
>  #define   GEN6_PCODE_WRITE_RC6VIDS		0x4
>  #define   GEN6_PCODE_READ_RC6VIDS		0x5
> @@ -8879,6 +8881,7 @@ enum {
>  #define   ICL_PCODE_MEM_SUBSYSYSTEM_INFO	0xd
>  #define     ICL_PCODE_MEM_SS_READ_GLOBAL_INFO	(0x0 << 8)
>  #define     ICL_PCODE_MEM_SS_READ_QGV_POINT_INFO(point)	(((point) << 16) | (0x1 << 8))
> +#define   ICL_PCODE_SAGV_DE_MEM_SS_CONFIG	0xe
>  #define   GEN6_PCODE_READ_D_COMP		0x10
>  #define   GEN6_PCODE_WRITE_D_COMP		0x11
>  #define   HSW_PCODE_DE_WRITE_FREQ_REQ		0x17
> @@ -8891,6 +8894,8 @@ enum {
>  #define     GEN9_SAGV_IS_DISABLED		0x1
>  #define     GEN9_SAGV_ENABLE			0x3
>  #define GEN12_PCODE_READ_SAGV_BLOCK_TIME_US	0x23
> +#define GEN11_PCODE_POINTS_RESTRICTED		0x0
> +#define GEN11_PCODE_POINTS_RESTRICTED_MASK	0x1
>  #define GEN6_PCODE_DATA				_MMIO(0x138128)
>  #define   GEN6_PCODE_FREQ_IA_RATIO_SHIFT	8
>  #define   GEN6_PCODE_FREQ_RING_RATIO_SHIFT	16
> diff --git a/drivers/gpu/drm/i915/intel_sideband.c b/drivers/gpu/drm/i915/intel_sideband.c
> index e06b35b844a0..ff9dbed094d8 100644
> --- a/drivers/gpu/drm/i915/intel_sideband.c
> +++ b/drivers/gpu/drm/i915/intel_sideband.c
> @@ -371,6 +371,29 @@ static inline int gen7_check_mailbox_status(u32 mbox)
>  	}
>  }
>  
> +static inline int gen11_check_mailbox_status(u32 mbox)
> +{
> +	switch (mbox & GEN6_PCODE_ERROR_MASK) {
> +	case GEN6_PCODE_SUCCESS:
> +		return 0;
> +	case GEN6_PCODE_ILLEGAL_CMD:
> +		return -ENXIO;
> +	case GEN7_PCODE_TIMEOUT:
> +		return -ETIMEDOUT;
> +	case GEN7_PCODE_ILLEGAL_DATA:
> +		return -EINVAL;
> +	case GEN7_PCODE_MIN_FREQ_TABLE_GT_RATIO_OUT_OF_RANGE:
> +		return -EOVERFLOW;
> +	case GEN11_PCODE_MAIL_BOX_LOCKED:
> +		return -EAGAIN;
> +	case GEN11_PCODE_REJECTED:
> +		return -EACCES;
> +	default:
> +		MISSING_CASE(mbox & GEN6_PCODE_ERROR_MASK);
> +		return 0;
> +	}
> +}
> +
>  static int __sandybridge_pcode_rw(struct drm_i915_private *i915,
>  				  u32 mbox, u32 *val, u32 *val1,
>  				  int fast_timeout_us,
> @@ -408,7 +431,9 @@ static int __sandybridge_pcode_rw(struct drm_i915_private *i915,
>  	if (is_read && val1)
>  		*val1 = intel_uncore_read_fw(uncore, GEN6_PCODE_DATA1);
>  
> -	if (INTEL_GEN(i915) > 6)
> +	if (INTEL_GEN(i915) >= 11)
> +		return gen11_check_mailbox_status(mbox);
> +	else if (INTEL_GEN(i915) > 6)
>  		return gen7_check_mailbox_status(mbox);
>  	else
>  		return gen6_check_mailbox_status(mbox);
> -- 
> 2.17.1
> 
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: [Intel-gfx] [PATCH v8 2/2] drm/i915: Restrict qgv points which don't have enough bandwidth.

[James Ausmus]

On Fri, Oct 25, 2019 at 12:53:52PM +0300, Stanislav Lisovskiy wrote:
> According to BSpec 53998, we should try to
> restrict qgv points, which can't provide
> enough bandwidth for desired display configuration.
> 
> Currently we are just comparing against all of
> those and take minimum(worst case).
> 
> v2: Fixed wrong PCode reply mask, removed hardcoded
>     values.
> 
> v3: Forbid simultaneous legacy SAGV PCode requests and
>     restricting qgv points. Put the actual restriction
>     to commit function, added serialization(thanks to Ville)
>     to prevent commit being applied out of order in case of
>     nonblocking and/or nomodeset commits.
> 
> v4:
>     - Minor code refactoring, fixed few typos(thanks to James Ausmus)
>     - Change the naming of qgv point
>       masking/unmasking functions(James Ausmus).
>     - Simplify the masking/unmasking operation itself,
>       as we don't need to mask only single point per request(James Ausmus)
>     - Reject and stick to highest bandwidth point if SAGV
>       can't be enabled(BSpec)
> 
> v5:
>     - Add new mailbox reply codes, which seems to happen during boot
>       time for TGL and indicate that QGV setting is not yet available.
> 
> v6:
>     - Increase number of supported QGV points to be in sync with BSpec.
> 
> Reviewed-by: James Ausmus <james.ausmus@intel.com>
> Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
> Cc: Ville Syrjälä <ville.syrjala@intel.com>
> Cc: James Ausmus <james.ausmus@intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_atomic.c   |  16 +++
>  drivers/gpu/drm/i915/display/intel_atomic.h   |   3 +
>  drivers/gpu/drm/i915/display/intel_bw.c       | 111 ++++++++++++++----
>  drivers/gpu/drm/i915/display/intel_bw.h       |   2 +
>  drivers/gpu/drm/i915/display/intel_display.c  |  57 ++++++++-
>  .../drm/i915/display/intel_display_types.h    |   3 +
>  drivers/gpu/drm/i915/i915_drv.h               |   2 +
>  drivers/gpu/drm/i915/i915_reg.h               |   5 +
>  drivers/gpu/drm/i915/intel_sideband.c         |  27 ++++-
>  9 files changed, 198 insertions(+), 28 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_atomic.c b/drivers/gpu/drm/i915/display/intel_atomic.c
> index c5a552a69752..b3f4f02f380b 100644
> --- a/drivers/gpu/drm/i915/display/intel_atomic.c
> +++ b/drivers/gpu/drm/i915/display/intel_atomic.c
> @@ -207,6 +207,22 @@ intel_crtc_duplicate_state(struct drm_crtc *crtc)
>  	return &crtc_state->base;
>  }
>  
> +int intel_atomic_serialize_global_state(struct intel_atomic_state *state)
> +{
> +	struct drm_i915_private *dev_priv = to_i915(state->base.dev);
> +	struct intel_crtc *crtc;
> +
> +	for_each_intel_crtc(&dev_priv->drm, crtc) {
> +		struct intel_crtc_state *crtc_state;
> +
> +		crtc_state = intel_atomic_get_crtc_state(&state->base, crtc);
> +		if (IS_ERR(crtc_state))
> +			return PTR_ERR(crtc_state);
> +	}
> +
> +	return 0;
> +}
> +
>  /**
>   * intel_crtc_destroy_state - destroy crtc state
>   * @crtc: drm crtc
> diff --git a/drivers/gpu/drm/i915/display/intel_atomic.h b/drivers/gpu/drm/i915/display/intel_atomic.h
> index 58065d3161a3..fd17b3ca257f 100644
> --- a/drivers/gpu/drm/i915/display/intel_atomic.h
> +++ b/drivers/gpu/drm/i915/display/intel_atomic.h
> @@ -7,6 +7,7 @@
>  #define __INTEL_ATOMIC_H__
>  
>  #include <linux/types.h>
> +#include "intel_display_types.h"
>  
>  struct drm_atomic_state;
>  struct drm_connector;
> @@ -38,6 +39,8 @@ void intel_crtc_destroy_state(struct drm_crtc *crtc,
>  struct drm_atomic_state *intel_atomic_state_alloc(struct drm_device *dev);
>  void intel_atomic_state_clear(struct drm_atomic_state *state);
>  
> +int intel_atomic_serialize_global_state(struct intel_atomic_state *state);
> +
>  struct intel_crtc_state *
>  intel_atomic_get_crtc_state(struct drm_atomic_state *state,
>  			    struct intel_crtc *crtc);
> diff --git a/drivers/gpu/drm/i915/display/intel_bw.c b/drivers/gpu/drm/i915/display/intel_bw.c
> index 22e83f857de8..60249d9776d1 100644
> --- a/drivers/gpu/drm/i915/display/intel_bw.c
> +++ b/drivers/gpu/drm/i915/display/intel_bw.c
> @@ -8,14 +8,20 @@
>  #include "intel_bw.h"
>  #include "intel_display_types.h"
>  #include "intel_sideband.h"
> +#include "intel_atomic.h"
> +#include "intel_pm.h"
>  
>  /* Parameters for Qclk Geyserville (QGV) */
>  struct intel_qgv_point {
>  	u16 dclk, t_rp, t_rdpre, t_rc, t_ras, t_rcd;
>  };
>  
> +
> +/* BSpec precisely defines this */
> +#define NUM_SAGV_POINTS 4

Shouldn't this be defined in intel_bw.h?

From what I'm seeing in BSpec 53998 (Gen12), in the
MAILBOX_GTDRIVER_CMD_SAGV_DE_MEM_SS_CONFIG section, there can be 8
points (even though the pseudo-code a couple of sections later defines
it as 4), and it looks like BSpec 54023 (Gen11) has the same bit
defines. I think I trust the bit defines more than the pseudo-code :)

With the above fixed, my R-b from version applies to this version.

Thanks!

-James

> +
>  struct intel_qgv_info {
> -	struct intel_qgv_point points[3];
> +	struct intel_qgv_point points[NUM_SAGV_POINTS];
>  	u8 num_points;
>  	u8 num_channels;
>  	u8 t_bl;
> @@ -113,6 +119,27 @@ static int icl_pcode_read_qgv_point_info(struct drm_i915_private *dev_priv,
>  	return 0;
>  }
>  
> +int icl_pcode_restrict_qgv_points(struct drm_i915_private *dev_priv,
> +				  u32 points_mask)
> +{
> +	int ret;
> +
> +	/* bspec says to keep retrying for at least 1 ms */
> +	ret = skl_pcode_request(dev_priv, ICL_PCODE_SAGV_DE_MEM_SS_CONFIG,
> +				points_mask,
> +				GEN11_PCODE_POINTS_RESTRICTED_MASK,
> +				GEN11_PCODE_POINTS_RESTRICTED,
> +				1);
> +
> +	if (ret < 0) {
> +		DRM_ERROR("Failed to disable qgv points (%d)\n", ret);
> +		return ret;
> +	}
> +
> +	return 0;
> +}
> +
> +
>  static int icl_get_qgv_points(struct drm_i915_private *dev_priv,
>  			      struct intel_qgv_info *qi)
>  {
> @@ -270,22 +297,6 @@ void intel_bw_init_hw(struct drm_i915_private *dev_priv)
>  		icl_get_bw_info(dev_priv, &icl_sa_info);
>  }
>  
> -static unsigned int intel_max_data_rate(struct drm_i915_private *dev_priv,
> -					int num_planes)
> -{
> -	if (INTEL_GEN(dev_priv) >= 11)
> -		/*
> -		 * FIXME with SAGV disabled maybe we can assume
> -		 * point 1 will always be used? Seems to match
> -		 * the behaviour observed in the wild.
> -		 */
> -		return min3(icl_max_bw(dev_priv, num_planes, 0),
> -			    icl_max_bw(dev_priv, num_planes, 1),
> -			    icl_max_bw(dev_priv, num_planes, 2));
> -	else
> -		return UINT_MAX;
> -}
> -
>  static unsigned int intel_bw_crtc_num_active_planes(const struct intel_crtc_state *crtc_state)
>  {
>  	/*
> @@ -377,7 +388,10 @@ int intel_bw_atomic_check(struct intel_atomic_state *state)
>  	unsigned int data_rate, max_data_rate;
>  	unsigned int num_active_planes;
>  	struct intel_crtc *crtc;
> -	int i;
> +	int i, ret;
> +	struct intel_qgv_info qi = {};
> +	u32 allowed_points = 0;
> +	unsigned int max_bw_point = 0, max_bw = 0;
>  
>  	/* FIXME earlier gens need some checks too */
>  	if (INTEL_GEN(dev_priv) < 11)
> @@ -421,16 +435,67 @@ int intel_bw_atomic_check(struct intel_atomic_state *state)
>  	data_rate = intel_bw_data_rate(dev_priv, bw_state);
>  	num_active_planes = intel_bw_num_active_planes(dev_priv, bw_state);
>  
> -	max_data_rate = intel_max_data_rate(dev_priv, num_active_planes);
> -
>  	data_rate = DIV_ROUND_UP(data_rate, 1000);
>  
> -	if (data_rate > max_data_rate) {
> -		DRM_DEBUG_KMS("Bandwidth %u MB/s exceeds max available %d MB/s (%d active planes)\n",
> -			      data_rate, max_data_rate, num_active_planes);
> +	ret = icl_get_qgv_points(dev_priv, &qi);
> +	if (ret < 0)
> +		return 0;
> +
> +	for (i = 0; i < qi.num_points; i++) {
> +		max_data_rate = icl_max_bw(dev_priv, num_active_planes, i);
> +		/*
> +		 * We need to know which qgv point gives us
> +		 * maximum bandwidth in order to disable SAGV
> +		 * if we find that we exceed SAGV block time
> +		 * with watermarks. By that moment we already
> +		 * have those, as it is calculated earlier in
> +		 * intel_atomic_check,
> +		 */
> +		if (max_data_rate > max_bw) {
> +			max_bw_point = i;
> +			max_bw = max_data_rate;
> +		}
> +		if (max_data_rate >= data_rate)
> +			allowed_points |= 1 << i;
> +		DRM_DEBUG_KMS("QGV point %d: max bw %d required %d\n",
> +			      i, max_data_rate, data_rate);
> +	}
> +
> +	/*
> +	 * BSpec states that we always should have at least one allowed point
> +	 * left, so if we couldn't - simply reject the configuration for obvious
> +	 * reasons.
> +	 */
> +	if (allowed_points == 0) {
> +		DRM_DEBUG_KMS("Could not find any suitable QGV points\n");
>  		return -EINVAL;
>  	}
>  
> +	/*
> +	 * Leave only single point with highest bandwidth, if
> +	 * we can't enable SAGV according to BSpec.
> +	 */
> +	if (!intel_can_enable_sagv(state))
> +		allowed_points = 1 << max_bw_point;
> +
> +	/*
> +	 * We store the ones which need to be masked as that is what PCode
> +	 * actually accepts as a parameter.
> +	 */
> +	state->qgv_points_mask = (~allowed_points) & ((1 << qi.num_points) - 1);
> +
> +	/*
> +	 * If the actual mask had changed we need to make sure that
> +	 * the commits are serialized(in case this is a nomodeset, nonblocking)
> +	 */
> +	if (state->qgv_points_mask != dev_priv->qgv_points_mask) {
> +		ret = intel_atomic_serialize_global_state(state);
> +		if (ret) {
> +			DRM_DEBUG_KMS("Could not serialize global state\n");
> +			return ret;
> +		}
> +	}
> +
>  	return 0;
>  }
>  
> diff --git a/drivers/gpu/drm/i915/display/intel_bw.h b/drivers/gpu/drm/i915/display/intel_bw.h
> index 9db10af012f4..66bf9bc10b73 100644
> --- a/drivers/gpu/drm/i915/display/intel_bw.h
> +++ b/drivers/gpu/drm/i915/display/intel_bw.h
> @@ -28,5 +28,7 @@ int intel_bw_init(struct drm_i915_private *dev_priv);
>  int intel_bw_atomic_check(struct intel_atomic_state *state);
>  void intel_bw_crtc_update(struct intel_bw_state *bw_state,
>  			  const struct intel_crtc_state *crtc_state);
> +int icl_pcode_restrict_qgv_points(struct drm_i915_private *dev_priv,
> +				  u32 points_mask);
>  
>  #endif /* __INTEL_BW_H__ */
> diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
> index 236fdf122e47..2def37615586 100644
> --- a/drivers/gpu/drm/i915/display/intel_display.c
> +++ b/drivers/gpu/drm/i915/display/intel_display.c
> @@ -14471,6 +14471,48 @@ static void intel_atomic_cleanup_work(struct work_struct *work)
>  	intel_atomic_helper_free_state(i915);
>  }
>  
> +static void intel_qgv_points_mask(struct intel_atomic_state *state)
> +{
> +	struct drm_device *dev = state->base.dev;
> +	struct drm_i915_private *dev_priv = to_i915(dev);
> +	int ret;
> +	u32 new_mask = dev_priv->qgv_points_mask | state->qgv_points_mask;
> +
> +	/*
> +	 * Restrict required qgv points before updating the configuration.
> +	 * According to BSpec we can't mask and unmask qgv points at the same
> +	 * time. Also masking should be done before updating the configuration
> +	 * and unmasking afterwards.
> +	 */
> +	ret = icl_pcode_restrict_qgv_points(dev_priv, new_mask);
> +	if (ret < 0)
> +		DRM_DEBUG_KMS("Could not restrict required qgv points(%d)\n",
> +			      ret);
> +	else
> +		dev_priv->qgv_points_mask = new_mask;
> +}
> +
> +static void intel_qgv_points_unmask(struct intel_atomic_state *state)
> +{
> +	struct drm_device *dev = state->base.dev;
> +	struct drm_i915_private *dev_priv = to_i915(dev);
> +	int ret;
> +	u32 new_mask = dev_priv->qgv_points_mask & state->qgv_points_mask;
> +
> +	/*
> +	 * Allow required qgv points after updating the configuration.
> +	 * According to BSpec we can't mask and unmask qgv points at the same
> +	 * time. Also masking should be done before updating the configuration
> +	 * and unmasking afterwards.
> +	 */
> +	ret = icl_pcode_restrict_qgv_points(dev_priv, new_mask);
> +	if (ret < 0)
> +		DRM_DEBUG_KMS("Could not restrict required qgv points(%d)\n",
> +			      ret);
> +	else
> +		dev_priv->qgv_points_mask = new_mask;
> +}
> +
>  static void intel_atomic_commit_tail(struct intel_atomic_state *state)
>  {
>  	struct drm_device *dev = state->base.dev;
> @@ -14498,6 +14540,9 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
>  		}
>  	}
>  
> +	if ((INTEL_GEN(dev_priv) >= 11))
> +		intel_qgv_points_mask(state);
> +
>  	intel_commit_modeset_disables(state);
>  
>  	/* FIXME: Eventually get rid of our crtc->config pointer */
> @@ -14516,8 +14561,9 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
>  		 * SKL workaround: bspec recommends we disable the SAGV when we
>  		 * have more then one pipe enabled
>  		 */
> -		if (!intel_can_enable_sagv(state))
> -			intel_disable_sagv(dev_priv);
> +		if (INTEL_GEN(dev_priv) < 11)
> +			if (!intel_can_enable_sagv(state))
> +				intel_disable_sagv(dev_priv);
>  
>  		intel_modeset_verify_disabled(dev_priv, state);
>  	}
> @@ -14595,8 +14641,11 @@ static void intel_atomic_commit_tail(struct intel_atomic_state *state)
>  	if (state->modeset)
>  		intel_verify_planes(state);
>  
> -	if (state->modeset && intel_can_enable_sagv(state))
> -		intel_enable_sagv(dev_priv);
> +	if (INTEL_GEN(dev_priv) < 11) {
> +		if (state->modeset && intel_can_enable_sagv(state))
> +			intel_enable_sagv(dev_priv);
> +	} else
> +		intel_qgv_points_unmask(state);
>  
>  	drm_atomic_helper_commit_hw_done(&state->base);
>  
> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h b/drivers/gpu/drm/i915/display/intel_display_types.h
> index f09c80c96470..0ef7351cc838 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -519,6 +519,9 @@ struct intel_atomic_state {
>  	struct i915_sw_fence commit_ready;
>  
>  	struct llist_node freed;
> +
> +	/* Gen11+ only */
> +	u32 qgv_points_mask;
>  };
>  
>  struct intel_plane_state {
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 8882c0908c3b..cec10cf99e71 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1327,6 +1327,8 @@ struct drm_i915_private {
>  		u8 num_planes;
>  	} max_bw[6];
>  
> +	u32 qgv_points_mask;
> +
>  	struct drm_private_obj bw_obj;
>  
>  	struct intel_runtime_pm runtime_pm;
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 855db888516c..93823443036f 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -8858,6 +8858,8 @@ enum {
>  #define     GEN6_PCODE_UNIMPLEMENTED_CMD	0xFF
>  #define     GEN7_PCODE_TIMEOUT			0x2
>  #define     GEN7_PCODE_ILLEGAL_DATA		0x3
> +#define     GEN11_PCODE_MAIL_BOX_LOCKED		0x6
> +#define     GEN11_PCODE_REJECTED		0x11
>  #define     GEN7_PCODE_MIN_FREQ_TABLE_GT_RATIO_OUT_OF_RANGE 0x10
>  #define   GEN6_PCODE_WRITE_RC6VIDS		0x4
>  #define   GEN6_PCODE_READ_RC6VIDS		0x5
> @@ -8879,6 +8881,7 @@ enum {
>  #define   ICL_PCODE_MEM_SUBSYSYSTEM_INFO	0xd
>  #define     ICL_PCODE_MEM_SS_READ_GLOBAL_INFO	(0x0 << 8)
>  #define     ICL_PCODE_MEM_SS_READ_QGV_POINT_INFO(point)	(((point) << 16) | (0x1 << 8))
> +#define   ICL_PCODE_SAGV_DE_MEM_SS_CONFIG	0xe
>  #define   GEN6_PCODE_READ_D_COMP		0x10
>  #define   GEN6_PCODE_WRITE_D_COMP		0x11
>  #define   HSW_PCODE_DE_WRITE_FREQ_REQ		0x17
> @@ -8891,6 +8894,8 @@ enum {
>  #define     GEN9_SAGV_IS_DISABLED		0x1
>  #define     GEN9_SAGV_ENABLE			0x3
>  #define GEN12_PCODE_READ_SAGV_BLOCK_TIME_US	0x23
> +#define GEN11_PCODE_POINTS_RESTRICTED		0x0
> +#define GEN11_PCODE_POINTS_RESTRICTED_MASK	0x1
>  #define GEN6_PCODE_DATA				_MMIO(0x138128)
>  #define   GEN6_PCODE_FREQ_IA_RATIO_SHIFT	8
>  #define   GEN6_PCODE_FREQ_RING_RATIO_SHIFT	16
> diff --git a/drivers/gpu/drm/i915/intel_sideband.c b/drivers/gpu/drm/i915/intel_sideband.c
> index e06b35b844a0..ff9dbed094d8 100644
> --- a/drivers/gpu/drm/i915/intel_sideband.c
> +++ b/drivers/gpu/drm/i915/intel_sideband.c
> @@ -371,6 +371,29 @@ static inline int gen7_check_mailbox_status(u32 mbox)
>  	}
>  }
>  
> +static inline int gen11_check_mailbox_status(u32 mbox)
> +{
> +	switch (mbox & GEN6_PCODE_ERROR_MASK) {
> +	case GEN6_PCODE_SUCCESS:
> +		return 0;
> +	case GEN6_PCODE_ILLEGAL_CMD:
> +		return -ENXIO;
> +	case GEN7_PCODE_TIMEOUT:
> +		return -ETIMEDOUT;
> +	case GEN7_PCODE_ILLEGAL_DATA:
> +		return -EINVAL;
> +	case GEN7_PCODE_MIN_FREQ_TABLE_GT_RATIO_OUT_OF_RANGE:
> +		return -EOVERFLOW;
> +	case GEN11_PCODE_MAIL_BOX_LOCKED:
> +		return -EAGAIN;
> +	case GEN11_PCODE_REJECTED:
> +		return -EACCES;
> +	default:
> +		MISSING_CASE(mbox & GEN6_PCODE_ERROR_MASK);
> +		return 0;
> +	}
> +}
> +
>  static int __sandybridge_pcode_rw(struct drm_i915_private *i915,
>  				  u32 mbox, u32 *val, u32 *val1,
>  				  int fast_timeout_us,
> @@ -408,7 +431,9 @@ static int __sandybridge_pcode_rw(struct drm_i915_private *i915,
>  	if (is_read && val1)
>  		*val1 = intel_uncore_read_fw(uncore, GEN6_PCODE_DATA1);
>  
> -	if (INTEL_GEN(i915) > 6)
> +	if (INTEL_GEN(i915) >= 11)
> +		return gen11_check_mailbox_status(mbox);
> +	else if (INTEL_GEN(i915) > 6)
>  		return gen7_check_mailbox_status(mbox);
>  	else
>  		return gen6_check_mailbox_status(mbox);
> -- 
> 2.17.1
> 
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✗ Fi.CI.BUILD: failure for Refactor Gen11+ SAGV support (rev4)

[Patchwork]

== Series Details ==

Series: Refactor Gen11+ SAGV support (rev4)
URL   : https://patchwork.freedesktop.org/series/68028/
State : failure

== Summary ==

CALL    scripts/checksyscalls.sh
  CALL    scripts/atomic/check-atomics.sh
  DESCEND  objtool
  CHK     include/generated/compile.h
  AR      drivers/gpu/drm/i915/built-in.a
  CC [M]  drivers/gpu/drm/i915/display/intel_atomic.o
drivers/gpu/drm/i915/display/intel_atomic.c:488:5: error: redefinition of ‘intel_atomic_serialize_global_state’
 int intel_atomic_serialize_global_state(struct intel_atomic_state *state)
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/i915/display/intel_atomic.c:210:5: note: previous definition of ‘intel_atomic_serialize_global_state’ was here
 int intel_atomic_serialize_global_state(struct intel_atomic_state *state)
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
scripts/Makefile.build:265: recipe for target 'drivers/gpu/drm/i915/display/intel_atomic.o' failed
make[4]: *** [drivers/gpu/drm/i915/display/intel_atomic.o] Error 1
scripts/Makefile.build:509: recipe for target 'drivers/gpu/drm/i915' failed
make[3]: *** [drivers/gpu/drm/i915] Error 2
scripts/Makefile.build:509: recipe for target 'drivers/gpu/drm' failed
make[2]: *** [drivers/gpu/drm] Error 2
scripts/Makefile.build:509: recipe for target 'drivers/gpu' failed
make[1]: *** [drivers/gpu] Error 2
Makefile:1649: recipe for target 'drivers' failed
make: *** [drivers] Error 2

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[Intel-gfx] ✗ Fi.CI.BUILD: failure for Refactor Gen11+ SAGV support (rev4)

[Patchwork]

== Series Details ==

Series: Refactor Gen11+ SAGV support (rev4)
URL   : https://patchwork.freedesktop.org/series/68028/
State : failure

== Summary ==

CALL    scripts/checksyscalls.sh
  CALL    scripts/atomic/check-atomics.sh
  DESCEND  objtool
  CHK     include/generated/compile.h
  AR      drivers/gpu/drm/i915/built-in.a
  CC [M]  drivers/gpu/drm/i915/display/intel_atomic.o
drivers/gpu/drm/i915/display/intel_atomic.c:488:5: error: redefinition of ‘intel_atomic_serialize_global_state’
 int intel_atomic_serialize_global_state(struct intel_atomic_state *state)
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
drivers/gpu/drm/i915/display/intel_atomic.c:210:5: note: previous definition of ‘intel_atomic_serialize_global_state’ was here
 int intel_atomic_serialize_global_state(struct intel_atomic_state *state)
     ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
scripts/Makefile.build:265: recipe for target 'drivers/gpu/drm/i915/display/intel_atomic.o' failed
make[4]: *** [drivers/gpu/drm/i915/display/intel_atomic.o] Error 1
scripts/Makefile.build:509: recipe for target 'drivers/gpu/drm/i915' failed
make[3]: *** [drivers/gpu/drm/i915] Error 2
scripts/Makefile.build:509: recipe for target 'drivers/gpu/drm' failed
make[2]: *** [drivers/gpu/drm] Error 2
scripts/Makefile.build:509: recipe for target 'drivers/gpu' failed
make[1]: *** [drivers/gpu] Error 2
Makefile:1649: recipe for target 'drivers' failed
make: *** [drivers] Error 2

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