[CI 00/17] Pre-calculate SKL-style atomic watermarks (final CI run)

[CI 00/17] Pre-calculate SKL-style atomic watermarks (final CI run)

[Matt Roper]

For a detailed explanation of this series, please see the original cover letter:
  https://lists.freedesktop.org/archives/intel-gfx/2016-April/091293.html

This series is fully reviewed now; just posting it one last time in its final
form to get CI test results before merging.

Matt Roper (17):
  drm/i915: Reorganize WM structs/unions in CRTC state
  drm/i915: Rename s/skl_compute_pipe_wm/skl_build_pipe_wm/
  drm/i915/gen9: Cache plane data rates in CRTC state
  drm/i915/gen9: Allow calculation of data rate for in-flight state (v2)
  drm/i915/gen9: Store plane minimum blocks in CRTC wm state (v2)
  drm/i915: Track whether an atomic transaction changes the active
    CRTC's
  drm/i915/gen9: Allow skl_allocate_pipe_ddb() to operate on in-flight
    state (v3)
  drm/i915: Add distrust_bios_wm flag to dev_priv (v2)
  drm/i915/gen9: Compute DDB allocation at atomic check time (v4)
  drm/i915/gen9: Drop re-allocation of DDB at atomic commit (v2)
  drm/i915/gen9: Calculate plane WM's from state
  drm/i915/gen9: Allow watermark calculation on in-flight atomic state
    (v3)
  drm/i915/gen9: Use a bitmask to track dirty pipe watermarks
  drm/i915/gen9: Propagate watermark calculation failures up the call
    chain
  drm/i915/gen9: Calculate watermarks during atomic 'check'
  drm/i915/gen9: Reject display updates that exceed wm limitations (v2)
  drm/i915: Remove wm_config from dev_priv/intel_atomic_state

 drivers/gpu/drm/i915/i915_drv.h      |  23 +-
 drivers/gpu/drm/i915/intel_display.c |  45 +--
 drivers/gpu/drm/i915/intel_drv.h     |  83 +++--
 drivers/gpu/drm/i915/intel_pm.c      | 604 +++++++++++++++++++++++------------
 4 files changed, 483 insertions(+), 272 deletions(-)

-- 
2.1.4

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[CI 01/17] drm/i915: Reorganize WM structs/unions in CRTC state

[Matt Roper]

Reorganize the nested structures and unions we have for pipe watermark
data in intel_crtc_state so that platform-specific data can be added in
a more sensible manner (and save a bit of memory at the same time).

The change basically changes the organization from:

        union {
                struct intel_pipe_wm ilk;
                struct intel_pipe_wm skl;
        } optimal;

        struct intel_pipe_wm intermediate /* ILK-only */

to

        union {
                struct {
                        struct intel_pipe_wm intermediate;
                        struct intel_pipe_wm optimal;
                } ilk;

                struct {
                        struct intel_pipe_wm optimal;
                } skl;
        }

There should be no functional change here, but it will allow us to add
more platform-specific fields going forward (and more easily extend to
other platform types like VLV).

While we're at it, let's move the entire watermark substructure out to
its own structure definition to make the code slightly more readable.

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_drv.h | 61 +++++++++++++++++++++++-----------------
 drivers/gpu/drm/i915/intel_pm.c  | 18 ++++++------
 2 files changed, 44 insertions(+), 35 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 1a3e69e..1b2e696 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -405,6 +405,40 @@ struct skl_pipe_wm {
 	uint32_t linetime;
 };
 
+struct intel_crtc_wm_state {
+	union {
+		struct {
+			/*
+			 * Intermediate watermarks; these can be
+			 * programmed immediately since they satisfy
+			 * both the current configuration we're
+			 * switching away from and the new
+			 * configuration we're switching to.
+			 */
+			struct intel_pipe_wm intermediate;
+
+			/*
+			 * Optimal watermarks, programmed post-vblank
+			 * when this state is committed.
+			 */
+			struct intel_pipe_wm optimal;
+		} ilk;
+
+		struct {
+			/* gen9+ only needs 1-step wm programming */
+			struct skl_pipe_wm optimal;
+		} skl;
+	};
+
+	/*
+	 * Platforms with two-step watermark programming will need to
+	 * update watermark programming post-vblank to switch from the
+	 * safe intermediate watermarks to the optimal final
+	 * watermarks.
+	 */
+	bool need_postvbl_update;
+};
+
 struct intel_crtc_state {
 	struct drm_crtc_state base;
 
@@ -558,32 +592,7 @@ struct intel_crtc_state {
 	/* IVB sprite scaling w/a (WaCxSRDisabledForSpriteScaling:ivb) */
 	bool disable_lp_wm;
 
-	struct {
-		/*
-		 * Optimal watermarks, programmed post-vblank when this state
-		 * is committed.
-		 */
-		union {
-			struct intel_pipe_wm ilk;
-			struct skl_pipe_wm skl;
-		} optimal;
-
-		/*
-		 * Intermediate watermarks; these can be programmed immediately
-		 * since they satisfy both the current configuration we're
-		 * switching away from and the new configuration we're switching
-		 * to.
-		 */
-		struct intel_pipe_wm intermediate;
-
-		/*
-		 * Platforms with two-step watermark programming will need to
-		 * update watermark programming post-vblank to switch from the
-		 * safe intermediate watermarks to the optimal final
-		 * watermarks.
-		 */
-		bool need_postvbl_update;
-	} wm;
+	struct intel_crtc_wm_state wm;
 
 	/* Gamma mode programmed on the pipe */
 	uint32_t gamma_mode;
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 1bb0f9a..540c651 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2309,7 +2309,7 @@ static int ilk_compute_pipe_wm(struct intel_crtc_state *cstate)
 	int level, max_level = ilk_wm_max_level(dev), usable_level;
 	struct ilk_wm_maximums max;
 
-	pipe_wm = &cstate->wm.optimal.ilk;
+	pipe_wm = &cstate->wm.ilk.optimal;
 
 	for_each_intel_plane_on_crtc(dev, intel_crtc, intel_plane) {
 		struct intel_plane_state *ps;
@@ -2391,7 +2391,7 @@ static int ilk_compute_intermediate_wm(struct drm_device *dev,
 				       struct intel_crtc *intel_crtc,
 				       struct intel_crtc_state *newstate)
 {
-	struct intel_pipe_wm *a = &newstate->wm.intermediate;
+	struct intel_pipe_wm *a = &newstate->wm.ilk.intermediate;
 	struct intel_pipe_wm *b = &intel_crtc->wm.active.ilk;
 	int level, max_level = ilk_wm_max_level(dev);
 
@@ -2400,7 +2400,7 @@ static int ilk_compute_intermediate_wm(struct drm_device *dev,
 	 * currently active watermarks to get values that are safe both before
 	 * and after the vblank.
 	 */
-	*a = newstate->wm.optimal.ilk;
+	*a = newstate->wm.ilk.optimal;
 	a->pipe_enabled |= b->pipe_enabled;
 	a->sprites_enabled |= b->sprites_enabled;
 	a->sprites_scaled |= b->sprites_scaled;
@@ -2429,7 +2429,7 @@ static int ilk_compute_intermediate_wm(struct drm_device *dev,
 	 * If our intermediate WM are identical to the final WM, then we can
 	 * omit the post-vblank programming; only update if it's different.
 	 */
-	if (memcmp(a, &newstate->wm.optimal.ilk, sizeof(*a)) == 0)
+	if (memcmp(a, &newstate->wm.ilk.optimal, sizeof(*a)) == 0)
 		newstate->wm.need_postvbl_update = false;
 
 	return 0;
@@ -3678,7 +3678,7 @@ static void skl_update_wm(struct drm_crtc *crtc)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct skl_wm_values *results = &dev_priv->wm.skl_results;
 	struct intel_crtc_state *cstate = to_intel_crtc_state(crtc->state);
-	struct skl_pipe_wm *pipe_wm = &cstate->wm.optimal.skl;
+	struct skl_pipe_wm *pipe_wm = &cstate->wm.skl.optimal;
 
 
 	/* Clear all dirty flags */
@@ -3757,7 +3757,7 @@ static void ilk_initial_watermarks(struct intel_crtc_state *cstate)
 	struct intel_crtc *intel_crtc = to_intel_crtc(cstate->base.crtc);
 
 	mutex_lock(&dev_priv->wm.wm_mutex);
-	intel_crtc->wm.active.ilk = cstate->wm.intermediate;
+	intel_crtc->wm.active.ilk = cstate->wm.ilk.intermediate;
 	ilk_program_watermarks(dev_priv);
 	mutex_unlock(&dev_priv->wm.wm_mutex);
 }
@@ -3769,7 +3769,7 @@ static void ilk_optimize_watermarks(struct intel_crtc_state *cstate)
 
 	mutex_lock(&dev_priv->wm.wm_mutex);
 	if (cstate->wm.need_postvbl_update) {
-		intel_crtc->wm.active.ilk = cstate->wm.optimal.ilk;
+		intel_crtc->wm.active.ilk = cstate->wm.ilk.optimal;
 		ilk_program_watermarks(dev_priv);
 	}
 	mutex_unlock(&dev_priv->wm.wm_mutex);
@@ -3826,7 +3826,7 @@ static void skl_pipe_wm_get_hw_state(struct drm_crtc *crtc)
 	struct skl_wm_values *hw = &dev_priv->wm.skl_hw;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	struct intel_crtc_state *cstate = to_intel_crtc_state(crtc->state);
-	struct skl_pipe_wm *active = &cstate->wm.optimal.skl;
+	struct skl_pipe_wm *active = &cstate->wm.skl.optimal;
 	enum pipe pipe = intel_crtc->pipe;
 	int level, i, max_level;
 	uint32_t temp;
@@ -3892,7 +3892,7 @@ static void ilk_pipe_wm_get_hw_state(struct drm_crtc *crtc)
 	struct ilk_wm_values *hw = &dev_priv->wm.hw;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	struct intel_crtc_state *cstate = to_intel_crtc_state(crtc->state);
-	struct intel_pipe_wm *active = &cstate->wm.optimal.ilk;
+	struct intel_pipe_wm *active = &cstate->wm.ilk.optimal;
 	enum pipe pipe = intel_crtc->pipe;
 	static const i915_reg_t wm0_pipe_reg[] = {
 		[PIPE_A] = WM0_PIPEA_ILK,
-- 
2.1.4

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[CI 02/17] drm/i915: Rename s/skl_compute_pipe_wm/skl_build_pipe_wm/

[Matt Roper]

When we added atomic watermarks, we added a new display vfunc
'compute_pipe_wm' that is used to compute any pipe-specific watermark
information that we can at atomic check time.  This was a somewhat poor
naming choice since we already had a 'skl_compute_pipe_wm' function that
doesn't quite fit this model --- the existing SKL function is something
that gets used at atomic commit time, after the DDB allocation has been
determined.  Let's rename the existing SKL function to avoid confusion.

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 540c651..f6520d5 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3327,9 +3327,9 @@ static void skl_compute_transition_wm(struct intel_crtc_state *cstate,
 	}
 }
 
-static void skl_compute_pipe_wm(struct intel_crtc_state *cstate,
-				struct skl_ddb_allocation *ddb,
-				struct skl_pipe_wm *pipe_wm)
+static void skl_build_pipe_wm(struct intel_crtc_state *cstate,
+			      struct skl_ddb_allocation *ddb,
+			      struct skl_pipe_wm *pipe_wm)
 {
 	struct drm_device *dev = cstate->base.crtc->dev;
 	const struct drm_i915_private *dev_priv = dev->dev_private;
@@ -3596,7 +3596,7 @@ static bool skl_update_pipe_wm(struct drm_crtc *crtc,
 	struct intel_crtc_state *cstate = to_intel_crtc_state(crtc->state);
 
 	skl_allocate_pipe_ddb(cstate, ddb);
-	skl_compute_pipe_wm(cstate, ddb, pipe_wm);
+	skl_build_pipe_wm(cstate, ddb, pipe_wm);
 
 	if (!memcmp(&intel_crtc->wm.active.skl, pipe_wm, sizeof(*pipe_wm)))
 		return false;
-- 
2.1.4

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[CI 03/17] drm/i915/gen9: Cache plane data rates in CRTC state

[Matt Roper]

This will be important when we start calculating CRTC data rates for
in-flight CRTC states since it will allow us to calculate the total data
rate without needing to grab the plane state for any planes that aren't
updated by the transaction.

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_drv.h |  4 ++
 drivers/gpu/drm/i915/intel_pm.c  | 92 ++++++++++++++++++++++++++--------------
 2 files changed, 63 insertions(+), 33 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 1b2e696..fd4fdd4 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -427,6 +427,10 @@ struct intel_crtc_wm_state {
 		struct {
 			/* gen9+ only needs 1-step wm programming */
 			struct skl_pipe_wm optimal;
+
+			/* cached plane data rate */
+			unsigned plane_data_rate[I915_MAX_PLANES];
+			unsigned plane_y_data_rate[I915_MAX_PLANES];
 		} skl;
 	};
 
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index f6520d5..88cc1e2 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2940,6 +2940,14 @@ skl_plane_relative_data_rate(const struct intel_crtc_state *cstate,
 	struct intel_plane_state *intel_pstate = to_intel_plane_state(pstate);
 	struct drm_framebuffer *fb = pstate->fb;
 	uint32_t width = 0, height = 0;
+	unsigned format = fb ? fb->pixel_format : DRM_FORMAT_XRGB8888;
+
+	if (!intel_pstate->visible)
+		return 0;
+	if (pstate->plane->type == DRM_PLANE_TYPE_CURSOR)
+		return 0;
+	if (y && format != DRM_FORMAT_NV12)
+		return 0;
 
 	width = drm_rect_width(&intel_pstate->src) >> 16;
 	height = drm_rect_height(&intel_pstate->src) >> 16;
@@ -2948,17 +2956,17 @@ skl_plane_relative_data_rate(const struct intel_crtc_state *cstate,
 		swap(width, height);
 
 	/* for planar format */
-	if (fb->pixel_format == DRM_FORMAT_NV12) {
+	if (format == DRM_FORMAT_NV12) {
 		if (y)  /* y-plane data rate */
 			return width * height *
-				drm_format_plane_cpp(fb->pixel_format, 0);
+				drm_format_plane_cpp(format, 0);
 		else    /* uv-plane data rate */
 			return (width / 2) * (height / 2) *
-				drm_format_plane_cpp(fb->pixel_format, 1);
+				drm_format_plane_cpp(format, 1);
 	}
 
 	/* for packed formats */
-	return width * height * drm_format_plane_cpp(fb->pixel_format, 0);
+	return width * height * drm_format_plane_cpp(format, 0);
 }
 
 /*
@@ -2967,32 +2975,34 @@ skl_plane_relative_data_rate(const struct intel_crtc_state *cstate,
  *   3 * 4096 * 8192  * 4 < 2^32
  */
 static unsigned int
-skl_get_total_relative_data_rate(const struct intel_crtc_state *cstate)
+skl_get_total_relative_data_rate(struct intel_crtc_state *cstate)
 {
 	struct intel_crtc *intel_crtc = to_intel_crtc(cstate->base.crtc);
 	struct drm_device *dev = intel_crtc->base.dev;
 	const struct intel_plane *intel_plane;
-	unsigned int total_data_rate = 0;
+	unsigned int rate, total_data_rate = 0;
 
+	/* Calculate and cache data rate for each plane */
 	for_each_intel_plane_on_crtc(dev, intel_crtc, intel_plane) {
 		const struct drm_plane_state *pstate = intel_plane->base.state;
+		int id = skl_wm_plane_id(intel_plane);
 
-		if (pstate->fb == NULL)
-			continue;
+		/* packed/uv */
+		rate = skl_plane_relative_data_rate(cstate, pstate, 0);
+		cstate->wm.skl.plane_data_rate[id] = rate;
 
-		if (intel_plane->base.type == DRM_PLANE_TYPE_CURSOR)
-			continue;
+		/* y-plane */
+		rate = skl_plane_relative_data_rate(cstate, pstate, 1);
+		cstate->wm.skl.plane_y_data_rate[id] = rate;
+	}
 
-		/* packed/uv */
-		total_data_rate += skl_plane_relative_data_rate(cstate,
-								pstate,
-								0);
+	/* Calculate CRTC's total data rate from cached values */
+	for_each_intel_plane_on_crtc(dev, intel_crtc, intel_plane) {
+		int id = skl_wm_plane_id(intel_plane);
 
-		if (pstate->fb->pixel_format == DRM_FORMAT_NV12)
-			/* y-plane */
-			total_data_rate += skl_plane_relative_data_rate(cstate,
-									pstate,
-									1);
+		/* packed/uv */
+		total_data_rate += cstate->wm.skl.plane_data_rate[id];
+		total_data_rate += cstate->wm.skl.plane_y_data_rate[id];
 	}
 
 	return total_data_rate;
@@ -3056,6 +3066,8 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
 	 * FIXME: we may not allocate every single block here.
 	 */
 	total_data_rate = skl_get_total_relative_data_rate(cstate);
+	if (total_data_rate == 0)
+		return;
 
 	start = alloc->start;
 	for_each_intel_plane_on_crtc(dev, intel_crtc, intel_plane) {
@@ -3070,7 +3082,7 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
 		if (plane->type == DRM_PLANE_TYPE_CURSOR)
 			continue;
 
-		data_rate = skl_plane_relative_data_rate(cstate, pstate, 0);
+		data_rate = cstate->wm.skl.plane_data_rate[id];
 
 		/*
 		 * allocation for (packed formats) or (uv-plane part of planar format):
@@ -3089,20 +3101,16 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
 		/*
 		 * allocation for y_plane part of planar format:
 		 */
-		if (pstate->fb->pixel_format == DRM_FORMAT_NV12) {
-			y_data_rate = skl_plane_relative_data_rate(cstate,
-								   pstate,
-								   1);
-			y_plane_blocks = y_minimum[id];
-			y_plane_blocks += div_u64((uint64_t)alloc_size * y_data_rate,
-						total_data_rate);
-
-			ddb->y_plane[pipe][id].start = start;
-			ddb->y_plane[pipe][id].end = start + y_plane_blocks;
-
-			start += y_plane_blocks;
-		}
+		y_data_rate = cstate->wm.skl.plane_y_data_rate[id];
+
+		y_plane_blocks = y_minimum[id];
+		y_plane_blocks += div_u64((uint64_t)alloc_size * y_data_rate,
+					total_data_rate);
 
+		ddb->y_plane[pipe][id].start = start;
+		ddb->y_plane[pipe][id].end = start + y_plane_blocks;
+
+		start += y_plane_blocks;
 	}
 
 }
@@ -3879,10 +3887,28 @@ void skl_wm_get_hw_state(struct drm_device *dev)
 	struct drm_i915_private *dev_priv = dev->dev_private;
 	struct skl_ddb_allocation *ddb = &dev_priv->wm.skl_hw.ddb;
 	struct drm_crtc *crtc;
+	struct intel_crtc *intel_crtc;
 
 	skl_ddb_get_hw_state(dev_priv, ddb);
 	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
 		skl_pipe_wm_get_hw_state(crtc);
+
+	/* Calculate plane data rates */
+	for_each_intel_crtc(dev, intel_crtc) {
+		struct intel_crtc_state *cstate = intel_crtc->config;
+		struct intel_plane *intel_plane;
+
+		for_each_intel_plane_on_crtc(dev, intel_crtc, intel_plane) {
+			const struct drm_plane_state *pstate =
+				intel_plane->base.state;
+			int id = skl_wm_plane_id(intel_plane);
+
+			cstate->wm.skl.plane_data_rate[id] =
+				skl_plane_relative_data_rate(cstate, pstate, 0);
+			cstate->wm.skl.plane_y_data_rate[id] =
+				skl_plane_relative_data_rate(cstate, pstate, 1);
+		}
+	}
 }
 
 static void ilk_pipe_wm_get_hw_state(struct drm_crtc *crtc)
-- 
2.1.4

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[CI 04/17] drm/i915/gen9: Allow calculation of data rate for in-flight state (v2)

[Matt Roper]

Our skl_get_total_relative_data_rate() function gets passed a crtc state
object to calculate the data rate for, but it currently always looks
up the committed plane states that correspond to that CRTC.  Let's
check whether the CRTC state is an in-flight state (meaning
cstate->state is non-NULL) and if so, use the corresponding in-flight
plane states.

We'll soon be using this function exclusively for in-flight states; at
that time we'll be able to simplify the function a bit, but for now we
allow it to be used in either mode.

v2:
 - Rebase on top of changes to cache plane data rates.

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c | 74 +++++++++++++++++++++++++++++++++--------
 1 file changed, 60 insertions(+), 14 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 88cc1e2..ad344da 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2975,25 +2975,69 @@ skl_plane_relative_data_rate(const struct intel_crtc_state *cstate,
  *   3 * 4096 * 8192  * 4 < 2^32
  */
 static unsigned int
-skl_get_total_relative_data_rate(struct intel_crtc_state *cstate)
+skl_get_total_relative_data_rate(struct intel_crtc_state *intel_cstate)
 {
-	struct intel_crtc *intel_crtc = to_intel_crtc(cstate->base.crtc);
-	struct drm_device *dev = intel_crtc->base.dev;
+	struct drm_crtc_state *cstate = &intel_cstate->base;
+	struct drm_atomic_state *state = cstate->state;
+	struct drm_crtc *crtc = cstate->crtc;
+	struct drm_device *dev = crtc->dev;
+	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	const struct intel_plane *intel_plane;
 	unsigned int rate, total_data_rate = 0;
+	int id;
 
 	/* Calculate and cache data rate for each plane */
-	for_each_intel_plane_on_crtc(dev, intel_crtc, intel_plane) {
-		const struct drm_plane_state *pstate = intel_plane->base.state;
-		int id = skl_wm_plane_id(intel_plane);
+	/*
+	 * FIXME: At the moment this function can be called on either an
+	 * in-flight or a committed state object.  If it's in-flight then we
+	 * only want to re-calculate the plane data rate for planes that are
+	 * part of the transaction (i.e., we don't want to grab any additional
+	 * plane states if we don't have to).  If we're operating on committed
+	 * state, we'll just go ahead and recalculate the plane data rate for
+	 * all planes.
+	 *
+	 * Once we finish moving our DDB allocation to the atomic check phase,
+	 * we'll only be calling this function on in-flight state objects, so
+	 * the 'else' branch here will go away.
+	 */
+	if (state) {
+		struct drm_plane *plane;
+		struct drm_plane_state *pstate;
+		int i;
+
+		for_each_plane_in_state(state, plane, pstate, i) {
+			intel_plane = to_intel_plane(plane);
+			id = skl_wm_plane_id(intel_plane);
+
+			if (intel_plane->pipe != intel_crtc->pipe)
+				continue;
+
+			/* packed/uv */
+			rate = skl_plane_relative_data_rate(intel_cstate,
+							    pstate, 0);
+			intel_cstate->wm.skl.plane_data_rate[id] = rate;
+
+			/* y-plane */
+			rate = skl_plane_relative_data_rate(intel_cstate,
+							    pstate, 1);
+			intel_cstate->wm.skl.plane_y_data_rate[id] = rate;
+		}
+	} else {
+		for_each_intel_plane_on_crtc(dev, intel_crtc, intel_plane) {
+			const struct drm_plane_state *pstate =
+				intel_plane->base.state;
+			int id = skl_wm_plane_id(intel_plane);
 
-		/* packed/uv */
-		rate = skl_plane_relative_data_rate(cstate, pstate, 0);
-		cstate->wm.skl.plane_data_rate[id] = rate;
+			/* packed/uv */
+			rate = skl_plane_relative_data_rate(intel_cstate,
+							    pstate, 0);
+			intel_cstate->wm.skl.plane_data_rate[id] = rate;
 
-		/* y-plane */
-		rate = skl_plane_relative_data_rate(cstate, pstate, 1);
-		cstate->wm.skl.plane_y_data_rate[id] = rate;
+			/* y-plane */
+			rate = skl_plane_relative_data_rate(intel_cstate,
+							    pstate, 1);
+			intel_cstate->wm.skl.plane_y_data_rate[id] = rate;
+		}
 	}
 
 	/* Calculate CRTC's total data rate from cached values */
@@ -3001,10 +3045,12 @@ skl_get_total_relative_data_rate(struct intel_crtc_state *cstate)
 		int id = skl_wm_plane_id(intel_plane);
 
 		/* packed/uv */
-		total_data_rate += cstate->wm.skl.plane_data_rate[id];
-		total_data_rate += cstate->wm.skl.plane_y_data_rate[id];
+		total_data_rate += intel_cstate->wm.skl.plane_data_rate[id];
+		total_data_rate += intel_cstate->wm.skl.plane_y_data_rate[id];
 	}
 
+	WARN_ON(cstate->plane_mask && total_data_rate == 0);
+
 	return total_data_rate;
 }
 
-- 
2.1.4

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[CI 05/17] drm/i915/gen9: Store plane minimum blocks in CRTC wm state (v2)

[Matt Roper]

This will eventually allow us to re-use old values without
re-calculating them for unchanged planes (which also helps us avoid
re-grabbing extra plane states).

v2:
 -  Drop unnecessary memset's; they were meant for a later patch (which
    got reworked anyway to not need them, but were mis-rebased into this
    one.  (Maarten)

Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_drv.h | 4 ++++
 drivers/gpu/drm/i915/intel_pm.c  | 4 ++--
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index fd4fdd4..4313019 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -431,6 +431,10 @@ struct intel_crtc_wm_state {
 			/* cached plane data rate */
 			unsigned plane_data_rate[I915_MAX_PLANES];
 			unsigned plane_y_data_rate[I915_MAX_PLANES];
+
+			/* minimum block allocation */
+			uint16_t minimum_blocks[I915_MAX_PLANES];
+			uint16_t minimum_y_blocks[I915_MAX_PLANES];
 		} skl;
 	};
 
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index ad344da..05b04a6 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3067,8 +3067,8 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
 	enum pipe pipe = intel_crtc->pipe;
 	struct skl_ddb_entry *alloc = &ddb->pipe[pipe];
 	uint16_t alloc_size, start, cursor_blocks;
-	uint16_t minimum[I915_MAX_PLANES];
-	uint16_t y_minimum[I915_MAX_PLANES];
+	uint16_t *minimum = cstate->wm.skl.minimum_blocks;
+	uint16_t *y_minimum = cstate->wm.skl.minimum_y_blocks;
 	unsigned int total_data_rate;
 
 	skl_ddb_get_pipe_allocation_limits(dev, cstate, config, alloc);
-- 
2.1.4

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[CI 06/17] drm/i915: Track whether an atomic transaction changes the active CRTC's

[Matt Roper]

For the purposes of DDB re-allocation we need to know whether a
transaction changes the list of CRTC's that are active.  While
state->modeset could be used for this purpose, that would be slightly
too aggressive since it would lead us to re-allocate the DDB when a
CRTC's mode changes, but not its final active state.

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c |  3 +++
 drivers/gpu/drm/i915/intel_drv.h     | 10 ++++++++++
 2 files changed, 13 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index b60d9b6..d680fb3 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13271,6 +13271,9 @@ static int intel_modeset_checks(struct drm_atomic_state *state)
 			intel_state->active_crtcs |= 1 << i;
 		else
 			intel_state->active_crtcs &= ~(1 << i);
+
+		if (crtc_state->active != crtc->state->active)
+			intel_state->active_pipe_changes |= drm_crtc_mask(crtc);
 	}
 
 	/*
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 4313019..69b4119 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -291,6 +291,16 @@ struct intel_atomic_state {
 
 	bool dpll_set, modeset;
 
+	/*
+	 * Does this transaction change the pipes that are active?  This mask
+	 * tracks which CRTC's have changed their active state at the end of
+	 * the transaction (not counting the temporary disable during modesets).
+	 * This mask should only be non-zero when intel_state->modeset is true,
+	 * but the converse is not necessarily true; simply changing a mode may
+	 * not flip the final active status of any CRTC's
+	 */
+	unsigned int active_pipe_changes;
+
 	unsigned int active_crtcs;
 	unsigned int min_pixclk[I915_MAX_PIPES];
 
-- 
2.1.4

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[CI 07/17] drm/i915/gen9: Allow skl_allocate_pipe_ddb() to operate on in-flight state (v3)

[Matt Roper]

We eventually want to calculate watermark values at atomic 'check' time
instead of atomic 'commit' time so that any requested configurations
that result in impossible watermark requirements are properly rejected.
The first step along this path is to allocate the DDB at atomic 'check'
time.  As we perform this transition, allow the main allocation function
to operate successfully on either an in-flight state or an
already-commited state.  Once we complete the transition in a future
patch, we'll come back and remove the unnecessary logic for the
already-committed case.

v2: Rebase/refactor; we should no longer need to grab extra plane states
    while allocating the DDB since we can pull cached data rates and
    minimum block counts from the CRTC state for any planes that aren't
    being modified by this transaction.

v3:
 - Simplify memsets to clear DDB plane entries.  (Maarten)
 - Drop a redundant memset of plane[pipe][PLANE_CURSOR] that was added
   by an earlier Coccinelle patch.  (Maarten)
 - Assign *num_active at the top of skl_ddb_get_pipe_allocation_limits()
   so that no code paths return without setting it.  (kbuild robot)

Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h |   6 ++
 drivers/gpu/drm/i915/intel_pm.c | 179 +++++++++++++++++++++++++++++-----------
 2 files changed, 139 insertions(+), 46 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 7a0b513..d59087f 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -324,6 +324,12 @@ struct i915_hotplug {
 			    &dev->mode_config.plane_list,	\
 			    base.head)
 
+#define for_each_intel_plane_mask(dev, intel_plane, plane_mask)		\
+	list_for_each_entry(intel_plane, &dev->mode_config.plane_list,	\
+			    base.head)					\
+		for_each_if ((plane_mask) &				\
+			     (1 << drm_plane_index(&intel_plane->base)))
+
 #define for_each_intel_plane_on_crtc(dev, intel_crtc, intel_plane)	\
 	list_for_each_entry(intel_plane,				\
 			    &(dev)->mode_config.plane_list,		\
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 05b04a6..ca38f6c 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2849,13 +2849,25 @@ skl_wm_plane_id(const struct intel_plane *plane)
 static void
 skl_ddb_get_pipe_allocation_limits(struct drm_device *dev,
 				   const struct intel_crtc_state *cstate,
-				   const struct intel_wm_config *config,
-				   struct skl_ddb_entry *alloc /* out */)
+				   struct intel_wm_config *config,
+				   struct skl_ddb_entry *alloc, /* out */
+				   int *num_active /* out */)
 {
+	struct drm_atomic_state *state = cstate->base.state;
+	struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
+	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct drm_crtc *for_crtc = cstate->base.crtc;
 	struct drm_crtc *crtc;
 	unsigned int pipe_size, ddb_size;
 	int nth_active_pipe;
+	int pipe = to_intel_crtc(for_crtc)->pipe;
+
+	if (intel_state && intel_state->active_pipe_changes)
+		*num_active = hweight32(intel_state->active_crtcs);
+	else if (intel_state)
+		*num_active = hweight32(dev_priv->active_crtcs);
+	else
+		*num_active = config->num_pipes_active;
 
 	if (!cstate->base.active) {
 		alloc->start = 0;
@@ -2870,25 +2882,56 @@ skl_ddb_get_pipe_allocation_limits(struct drm_device *dev,
 
 	ddb_size -= 4; /* 4 blocks for bypass path allocation */
 
-	nth_active_pipe = 0;
-	for_each_crtc(dev, crtc) {
-		if (!to_intel_crtc(crtc)->active)
-			continue;
+	/*
+	 * FIXME: At the moment we may be called on either in-flight or fully
+	 * committed cstate's.  Once we fully move DDB allocation in the check
+	 * phase, we'll only be called on in-flight states and the 'else'
+	 * branch here will go away.
+	 *
+	 * The 'else' branch is slightly racy here, but it was racy to begin
+	 * with; since it's going away soon, no effort is made to address that.
+	 */
+	if (state) {
+		/*
+		 * If the state doesn't change the active CRTC's, then there's
+		 * no need to recalculate; the existing pipe allocation limits
+		 * should remain unchanged.  Note that we're safe from racing
+		 * commits since any racing commit that changes the active CRTC
+		 * list would need to grab _all_ crtc locks, including the one
+		 * we currently hold.
+		 */
+		if (!intel_state->active_pipe_changes) {
+			*alloc = dev_priv->wm.skl_hw.ddb.pipe[pipe];
+			return;
+		}
 
-		if (crtc == for_crtc)
-			break;
+		nth_active_pipe = hweight32(intel_state->active_crtcs &
+					    (drm_crtc_mask(for_crtc) - 1));
+		pipe_size = ddb_size / hweight32(intel_state->active_crtcs);
+		alloc->start = nth_active_pipe * ddb_size / *num_active;
+		alloc->end = alloc->start + pipe_size;
+	} else {
+		nth_active_pipe = 0;
+		for_each_crtc(dev, crtc) {
+			if (!to_intel_crtc(crtc)->active)
+				continue;
 
-		nth_active_pipe++;
-	}
+			if (crtc == for_crtc)
+				break;
 
-	pipe_size = ddb_size / config->num_pipes_active;
-	alloc->start = nth_active_pipe * ddb_size / config->num_pipes_active;
-	alloc->end = alloc->start + pipe_size;
+			nth_active_pipe++;
+		}
+
+		pipe_size = ddb_size / config->num_pipes_active;
+		alloc->start = nth_active_pipe * ddb_size /
+			config->num_pipes_active;
+		alloc->end = alloc->start + pipe_size;
+	}
 }
 
-static unsigned int skl_cursor_allocation(const struct intel_wm_config *config)
+static unsigned int skl_cursor_allocation(int num_active)
 {
-	if (config->num_pipes_active == 1)
+	if (num_active == 1)
 		return 32;
 
 	return 8;
@@ -3054,33 +3097,44 @@ skl_get_total_relative_data_rate(struct intel_crtc_state *intel_cstate)
 	return total_data_rate;
 }
 
-static void
+static int
 skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
 		      struct skl_ddb_allocation *ddb /* out */)
 {
+	struct drm_atomic_state *state = cstate->base.state;
 	struct drm_crtc *crtc = cstate->base.crtc;
 	struct drm_device *dev = crtc->dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct intel_wm_config *config = &dev_priv->wm.config;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	struct intel_plane *intel_plane;
+	struct drm_plane *plane;
+	struct drm_plane_state *pstate;
 	enum pipe pipe = intel_crtc->pipe;
 	struct skl_ddb_entry *alloc = &ddb->pipe[pipe];
 	uint16_t alloc_size, start, cursor_blocks;
 	uint16_t *minimum = cstate->wm.skl.minimum_blocks;
 	uint16_t *y_minimum = cstate->wm.skl.minimum_y_blocks;
 	unsigned int total_data_rate;
+	int num_active;
+	int id, i;
 
-	skl_ddb_get_pipe_allocation_limits(dev, cstate, config, alloc);
+	if (!cstate->base.active) {
+		ddb->pipe[pipe].start = ddb->pipe[pipe].end = 0;
+		memset(ddb->plane[pipe], 0, sizeof(ddb->plane[pipe]));
+		memset(ddb->y_plane[pipe], 0, sizeof(ddb->y_plane[pipe]));
+		return 0;
+	}
+
+	skl_ddb_get_pipe_allocation_limits(dev, cstate, config, alloc,
+					   &num_active);
 	alloc_size = skl_ddb_entry_size(alloc);
 	if (alloc_size == 0) {
 		memset(ddb->plane[pipe], 0, sizeof(ddb->plane[pipe]));
-		memset(&ddb->plane[pipe][PLANE_CURSOR], 0,
-		       sizeof(ddb->plane[pipe][PLANE_CURSOR]));
-		return;
+		return 0;
 	}
 
-	cursor_blocks = skl_cursor_allocation(config);
+	cursor_blocks = skl_cursor_allocation(num_active);
 	ddb->plane[pipe][PLANE_CURSOR].start = alloc->end - cursor_blocks;
 	ddb->plane[pipe][PLANE_CURSOR].end = alloc->end;
 
@@ -3088,21 +3142,55 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
 	alloc->end -= cursor_blocks;
 
 	/* 1. Allocate the mininum required blocks for each active plane */
-	for_each_intel_plane_on_crtc(dev, intel_crtc, intel_plane) {
-		struct drm_plane *plane = &intel_plane->base;
-		struct drm_framebuffer *fb = plane->state->fb;
-		int id = skl_wm_plane_id(intel_plane);
+	/*
+	 * TODO: Remove support for already-committed state once we
+	 * only allocate DDB on in-flight states.
+	 */
+	if (state) {
+		for_each_plane_in_state(state, plane, pstate, i) {
+			intel_plane = to_intel_plane(plane);
+			id = skl_wm_plane_id(intel_plane);
 
-		if (!to_intel_plane_state(plane->state)->visible)
-			continue;
+			if (intel_plane->pipe != pipe)
+				continue;
 
-		if (plane->type == DRM_PLANE_TYPE_CURSOR)
-			continue;
+			if (!to_intel_plane_state(pstate)->visible) {
+				minimum[id] = 0;
+				y_minimum[id] = 0;
+				continue;
+			}
+			if (plane->type == DRM_PLANE_TYPE_CURSOR) {
+				minimum[id] = 0;
+				y_minimum[id] = 0;
+				continue;
+			}
+
+			minimum[id] = 8;
+			if (pstate->fb->pixel_format == DRM_FORMAT_NV12)
+				y_minimum[id] = 8;
+			else
+				y_minimum[id] = 0;
+		}
+	} else {
+		for_each_intel_plane_on_crtc(dev, intel_crtc, intel_plane) {
+			struct drm_plane *plane = &intel_plane->base;
+			struct drm_framebuffer *fb = plane->state->fb;
+			int id = skl_wm_plane_id(intel_plane);
+
+			if (!to_intel_plane_state(plane->state)->visible)
+				continue;
+
+			if (plane->type == DRM_PLANE_TYPE_CURSOR)
+				continue;
+
+			minimum[id] = 8;
+			y_minimum[id] = (fb->pixel_format == DRM_FORMAT_NV12) ? 8 : 0;
+		}
+	}
 
-		minimum[id] = 8;
-		alloc_size -= minimum[id];
-		y_minimum[id] = (fb->pixel_format == DRM_FORMAT_NV12) ? 8 : 0;
-		alloc_size -= y_minimum[id];
+	for (i = 0; i < PLANE_CURSOR; i++) {
+		alloc_size -= minimum[i];
+		alloc_size -= y_minimum[i];
 	}
 
 	/*
@@ -3113,21 +3201,14 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
 	 */
 	total_data_rate = skl_get_total_relative_data_rate(cstate);
 	if (total_data_rate == 0)
-		return;
+		return 0;
 
 	start = alloc->start;
 	for_each_intel_plane_on_crtc(dev, intel_crtc, intel_plane) {
-		struct drm_plane *plane = &intel_plane->base;
-		struct drm_plane_state *pstate = intel_plane->base.state;
 		unsigned int data_rate, y_data_rate;
 		uint16_t plane_blocks, y_plane_blocks = 0;
 		int id = skl_wm_plane_id(intel_plane);
 
-		if (!to_intel_plane_state(pstate)->visible)
-			continue;
-		if (plane->type == DRM_PLANE_TYPE_CURSOR)
-			continue;
-
 		data_rate = cstate->wm.skl.plane_data_rate[id];
 
 		/*
@@ -3139,8 +3220,11 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
 		plane_blocks += div_u64((uint64_t)alloc_size * data_rate,
 					total_data_rate);
 
-		ddb->plane[pipe][id].start = start;
-		ddb->plane[pipe][id].end = start + plane_blocks;
+		/* Leave disabled planes at (0,0) */
+		if (data_rate) {
+			ddb->plane[pipe][id].start = start;
+			ddb->plane[pipe][id].end = start + plane_blocks;
+		}
 
 		start += plane_blocks;
 
@@ -3153,12 +3237,15 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
 		y_plane_blocks += div_u64((uint64_t)alloc_size * y_data_rate,
 					total_data_rate);
 
-		ddb->y_plane[pipe][id].start = start;
-		ddb->y_plane[pipe][id].end = start + y_plane_blocks;
+		if (y_data_rate) {
+			ddb->y_plane[pipe][id].start = start;
+			ddb->y_plane[pipe][id].end = start + y_plane_blocks;
+		}
 
 		start += y_plane_blocks;
 	}
 
+	return 0;
 }
 
 static uint32_t skl_pipe_pixel_rate(const struct intel_crtc_state *config)
@@ -3649,7 +3736,7 @@ static bool skl_update_pipe_wm(struct drm_crtc *crtc,
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	struct intel_crtc_state *cstate = to_intel_crtc_state(crtc->state);
 
-	skl_allocate_pipe_ddb(cstate, ddb);
+	WARN_ON(skl_allocate_pipe_ddb(cstate, ddb) != 0);
 	skl_build_pipe_wm(cstate, ddb, pipe_wm);
 
 	if (!memcmp(&intel_crtc->wm.active.skl, pipe_wm, sizeof(*pipe_wm)))
-- 
2.1.4

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[CI 08/17] drm/i915: Add distrust_bios_wm flag to dev_priv (v2)

[Matt Roper]

SKL-style platforms can't fully trust the watermark/DDB settings
programmed by the BIOS and need to do extra sanitization on their first
atomic update.  Add a flag to dev_priv that is set during hardware
readout and cleared at the end of the first commit.

Note that for the somewhat common case where everything is turned off
when the driver starts up, we don't need to bother with a recompute...we
know exactly what the DDB should be (all zero's) so just setup the DDB
directly in that case.

v2:
 - Move clearing of distrust_bios_wm up below the swap_state call since
   it's a more natural / self-explanatory location.  (Maarten)
 - Use dev_priv->active_crtcs to test whether any CRTC's are turned on
   during HW WM readout rather than trying to count the active CRTC's
   again ourselves.  (Maarten)

Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h      | 7 +++++++
 drivers/gpu/drm/i915/intel_display.c | 1 +
 drivers/gpu/drm/i915/intel_pm.c      | 8 ++++++++
 3 files changed, 16 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index d59087f..b7037051 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1995,6 +1995,13 @@ struct drm_i915_private {
 		 * cstate->wm.need_postvbl_update.
 		 */
 		struct mutex wm_mutex;
+
+		/*
+		 * Set during HW readout of watermarks/DDB.  Some platforms
+		 * need to know when we're still using BIOS-provided values
+		 * (which we don't fully trust).
+		 */
+		bool distrust_bios_wm;
 	} wm;
 
 	struct i915_runtime_pm pm;
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index d680fb3..bcf105a 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13595,6 +13595,7 @@ static int intel_atomic_commit(struct drm_device *dev,
 
 	drm_atomic_helper_swap_state(dev, state);
 	dev_priv->wm.config = intel_state->wm_config;
+	dev_priv->wm.distrust_bios_wm = false;
 	intel_shared_dpll_commit(state);
 
 	if (intel_state->modeset) {
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index ca38f6c..87fae2e 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -4026,6 +4026,14 @@ void skl_wm_get_hw_state(struct drm_device *dev)
 	list_for_each_entry(crtc, &dev->mode_config.crtc_list, head)
 		skl_pipe_wm_get_hw_state(crtc);
 
+	if (dev_priv->active_crtcs) {
+		/* Fully recompute DDB on first atomic commit */
+		dev_priv->wm.distrust_bios_wm = true;
+	} else {
+		/* Easy/common case; just sanitize DDB now if everything off */
+		memset(ddb, 0, sizeof(*ddb));
+	}
+
 	/* Calculate plane data rates */
 	for_each_intel_crtc(dev, intel_crtc) {
 		struct intel_crtc_state *cstate = intel_crtc->config;
-- 
2.1.4

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[CI 09/17] drm/i915/gen9: Compute DDB allocation at atomic check time (v4)

[Matt Roper]

Calculate the DDB blocks needed to satisfy the current atomic
transaction at atomic check time.  This is a prerequisite to calculating
SKL watermarks during the 'check' phase and rejecting any configurations
that we can't find valid watermarks for.

Due to the nature of DDB allocation, it's possible for the addition of a
new CRTC to make the watermark configuration already in use on another,
unchanged CRTC become invalid.  A change in which CRTC's are active
triggers a recompute of the entire DDB, which unfortunately means we
need to disallow any other atomic commits from racing with such an
update.  If the active CRTC's change, we need to grab the lock on all
CRTC's and run all CRTC's through their 'check' handler to recompute and
re-check their per-CRTC DDB allocations.

Note that with this patch we only compute the DDB allocation but we
don't actually use the computed values during watermark programming yet.
For ease of review/testing/bisecting, we still recompute the DDB at
watermark programming time and just WARN() if it doesn't match the
precomputed values.  A future patch will switch over to using the
precomputed values once we're sure they're being properly computed.

Another clarifying note:  DDB allocation itself shouldn't ever fail with
the algorithm we use today (i.e., we have enough DDB blocks on BXT to
support the minimum needs of the worst-case scenario of every pipe/plane
enabled at full size).  However the watermarks calculations based on the
DDB may fail and we'll be moving those to the atomic check as well in
future patches.

v2:
 - Skip DDB calculations in the rare case where our transaction doesn't
   actually touch any CRTC's at all.  Assuming at least one CRTC state
   is present in our transaction, then it means we can't race with any
   transactions that would update dev_priv->active_crtcs (which requires
   _all_ CRTC locks).

v3:
 - Also calculate DDB during initial hw readout, to prevent using
   incorrect bios values. (Maarten)

v4:
 - Use new distrust_bios_wm flag instead of skip_initial_wm (which was
   never actually set).
 - Set intel_state->active_pipe_changes instead of just realloc_pipes

Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Lyude Paul <cpaul@redhat.com>
Cc: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h      |  5 +++
 drivers/gpu/drm/i915/intel_display.c | 18 ++++++++
 drivers/gpu/drm/i915/intel_drv.h     |  3 ++
 drivers/gpu/drm/i915/intel_pm.c      | 79 ++++++++++++++++++++++++++++++++++++
 4 files changed, 105 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index b7037051..fdbaf18 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -339,6 +339,10 @@ struct i915_hotplug {
 #define for_each_intel_crtc(dev, intel_crtc) \
 	list_for_each_entry(intel_crtc, &dev->mode_config.crtc_list, base.head)
 
+#define for_each_intel_crtc_mask(dev, intel_crtc, crtc_mask) \
+	list_for_each_entry(intel_crtc, &dev->mode_config.crtc_list, base.head) \
+		for_each_if ((crtc_mask) & (1 << drm_crtc_index(&intel_crtc->base)))
+
 #define for_each_intel_encoder(dev, intel_encoder)		\
 	list_for_each_entry(intel_encoder,			\
 			    &(dev)->mode_config.encoder_list,	\
@@ -594,6 +598,7 @@ struct drm_i915_display_funcs {
 				       struct intel_crtc_state *newstate);
 	void (*initial_watermarks)(struct intel_crtc_state *cstate);
 	void (*optimize_watermarks)(struct intel_crtc_state *cstate);
+	int (*compute_global_watermarks)(struct drm_atomic_state *state);
 	void (*update_wm)(struct drm_crtc *crtc);
 	int (*modeset_calc_cdclk)(struct drm_atomic_state *state);
 	void (*modeset_commit_cdclk)(struct drm_atomic_state *state);
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index bcf105a..ebbb885e 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13313,6 +13313,7 @@ static int intel_modeset_checks(struct drm_atomic_state *state)
 static void calc_watermark_data(struct drm_atomic_state *state)
 {
 	struct drm_device *dev = state->dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
 	struct drm_crtc *crtc;
 	struct drm_crtc_state *cstate;
@@ -13342,6 +13343,10 @@ static void calc_watermark_data(struct drm_atomic_state *state)
 		    pstate->crtc_h != pstate->src_h >> 16)
 			intel_state->wm_config.sprites_scaled = true;
 	}
+
+	/* Is there platform-specific watermark information to calculate? */
+	if (dev_priv->display.compute_global_watermarks)
+		dev_priv->display.compute_global_watermarks(state);
 }
 
 /**
@@ -13713,6 +13718,19 @@ static int intel_atomic_commit(struct drm_device *dev,
 		intel_modeset_verify_crtc(crtc, old_crtc_state, crtc->state);
 	}
 
+	/*
+	 * Temporary sanity check: make sure our pre-computed DDB matches the
+	 * one we actually wind up programming.
+	 *
+	 * Not a great place to put this, but the easiest place we have access
+	 * to both the pre-computed and final DDB's; we'll be removing this
+	 * check in the next patch anyway.
+	 */
+	WARN(IS_GEN9(dev) &&
+	     memcmp(&intel_state->ddb, &dev_priv->wm.skl_results.ddb,
+		    sizeof(intel_state->ddb)),
+	     "Pre-computed DDB does not match final DDB!\n");
+
 	if (intel_state->modeset)
 		intel_display_power_put(dev_priv, POWER_DOMAIN_MODESET);
 
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 69b4119..c9a4c42 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -312,6 +312,9 @@ struct intel_atomic_state {
 	 * don't bother calculating intermediate watermarks.
 	 */
 	bool skip_intermediate_wm;
+
+	/* Gen9+ only */
+	struct skl_ddb_allocation ddb;
 };
 
 struct intel_plane_state {
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 87fae2e..7b2545c 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3812,6 +3812,84 @@ static void skl_clear_wm(struct skl_wm_values *watermarks, enum pipe pipe)
 
 }
 
+static int
+skl_compute_ddb(struct drm_atomic_state *state)
+{
+	struct drm_device *dev = state->dev;
+	struct drm_i915_private *dev_priv = to_i915(dev);
+	struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
+	struct intel_crtc *intel_crtc;
+	unsigned realloc_pipes = dev_priv->active_crtcs;
+	int ret;
+
+	/*
+	 * If this is our first atomic update following hardware readout,
+	 * we can't trust the DDB that the BIOS programmed for us.  Let's
+	 * pretend that all pipes switched active status so that we'll
+	 * ensure a full DDB recompute.
+	 */
+	if (dev_priv->wm.distrust_bios_wm)
+		intel_state->active_pipe_changes = ~0;
+
+	/*
+	 * If the modeset changes which CRTC's are active, we need to
+	 * recompute the DDB allocation for *all* active pipes, even
+	 * those that weren't otherwise being modified in any way by this
+	 * atomic commit.  Due to the shrinking of the per-pipe allocations
+	 * when new active CRTC's are added, it's possible for a pipe that
+	 * we were already using and aren't changing at all here to suddenly
+	 * become invalid if its DDB needs exceeds its new allocation.
+	 *
+	 * Note that if we wind up doing a full DDB recompute, we can't let
+	 * any other display updates race with this transaction, so we need
+	 * to grab the lock on *all* CRTC's.
+	 */
+	if (intel_state->active_pipe_changes)
+		realloc_pipes = ~0;
+
+	for_each_intel_crtc_mask(dev, intel_crtc, realloc_pipes) {
+		struct intel_crtc_state *cstate;
+
+		cstate = intel_atomic_get_crtc_state(state, intel_crtc);
+		if (IS_ERR(cstate))
+			return PTR_ERR(cstate);
+
+		ret = skl_allocate_pipe_ddb(cstate, &intel_state->ddb);
+		if (ret)
+			return ret;
+	}
+
+	return 0;
+}
+
+static int
+skl_compute_wm(struct drm_atomic_state *state)
+{
+	struct drm_crtc *crtc;
+	struct drm_crtc_state *cstate;
+	int ret, i;
+	bool changed = false;
+
+	/*
+	 * If this transaction isn't actually touching any CRTC's, don't
+	 * bother with watermark calculation.  Note that if we pass this
+	 * test, we're guaranteed to hold at least one CRTC state mutex,
+	 * which means we can safely use values like dev_priv->active_crtcs
+	 * since any racing commits that want to update them would need to
+	 * hold _all_ CRTC state mutexes.
+	 */
+	for_each_crtc_in_state(state, crtc, cstate, i)
+		changed = true;
+	if (!changed)
+		return 0;
+
+	ret = skl_compute_ddb(state);
+	if (ret)
+		return ret;
+
+	return 0;
+}
+
 static void skl_update_wm(struct drm_crtc *crtc)
 {
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
@@ -7334,6 +7412,7 @@ void intel_init_pm(struct drm_device *dev)
 	if (INTEL_INFO(dev)->gen >= 9) {
 		skl_setup_wm_latency(dev);
 		dev_priv->display.update_wm = skl_update_wm;
+		dev_priv->display.compute_global_watermarks = skl_compute_wm;
 	} else if (HAS_PCH_SPLIT(dev)) {
 		ilk_setup_wm_latency(dev);
 
-- 
2.1.4

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[CI 10/17] drm/i915/gen9: Drop re-allocation of DDB at atomic commit (v2)

[Matt Roper]

Now that we're properly pre-allocating the DDB during the atomic check
phase and we trust that the allocation is appropriate, let's actually
use the allocation computed and not duplicate that work during the
commit phase.

v2:
 - Significant rebasing now that we can use cached data rates and
   minimum block allocations to avoid grabbing additional plane states.

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c |  14 +--
 drivers/gpu/drm/i915/intel_pm.c      | 224 +++++++++++------------------------
 2 files changed, 67 insertions(+), 171 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index ebbb885e..294358c 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13601,6 +13601,7 @@ static int intel_atomic_commit(struct drm_device *dev,
 	drm_atomic_helper_swap_state(dev, state);
 	dev_priv->wm.config = intel_state->wm_config;
 	dev_priv->wm.distrust_bios_wm = false;
+	dev_priv->wm.skl_results.ddb = intel_state->ddb;
 	intel_shared_dpll_commit(state);
 
 	if (intel_state->modeset) {
@@ -13718,19 +13719,6 @@ static int intel_atomic_commit(struct drm_device *dev,
 		intel_modeset_verify_crtc(crtc, old_crtc_state, crtc->state);
 	}
 
-	/*
-	 * Temporary sanity check: make sure our pre-computed DDB matches the
-	 * one we actually wind up programming.
-	 *
-	 * Not a great place to put this, but the easiest place we have access
-	 * to both the pre-computed and final DDB's; we'll be removing this
-	 * check in the next patch anyway.
-	 */
-	WARN(IS_GEN9(dev) &&
-	     memcmp(&intel_state->ddb, &dev_priv->wm.skl_results.ddb,
-		    sizeof(intel_state->ddb)),
-	     "Pre-computed DDB does not match final DDB!\n");
-
 	if (intel_state->modeset)
 		intel_display_power_put(dev_priv, POWER_DOMAIN_MODESET);
 
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 7b2545c..c192028 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -2849,7 +2849,6 @@ skl_wm_plane_id(const struct intel_plane *plane)
 static void
 skl_ddb_get_pipe_allocation_limits(struct drm_device *dev,
 				   const struct intel_crtc_state *cstate,
-				   struct intel_wm_config *config,
 				   struct skl_ddb_entry *alloc, /* out */
 				   int *num_active /* out */)
 {
@@ -2857,24 +2856,22 @@ skl_ddb_get_pipe_allocation_limits(struct drm_device *dev,
 	struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct drm_crtc *for_crtc = cstate->base.crtc;
-	struct drm_crtc *crtc;
 	unsigned int pipe_size, ddb_size;
 	int nth_active_pipe;
 	int pipe = to_intel_crtc(for_crtc)->pipe;
 
-	if (intel_state && intel_state->active_pipe_changes)
-		*num_active = hweight32(intel_state->active_crtcs);
-	else if (intel_state)
-		*num_active = hweight32(dev_priv->active_crtcs);
-	else
-		*num_active = config->num_pipes_active;
-
-	if (!cstate->base.active) {
+	if (WARN_ON(!state) || !cstate->base.active) {
 		alloc->start = 0;
 		alloc->end = 0;
+		*num_active = hweight32(dev_priv->active_crtcs);
 		return;
 	}
 
+	if (intel_state->active_pipe_changes)
+		*num_active = hweight32(intel_state->active_crtcs);
+	else
+		*num_active = hweight32(dev_priv->active_crtcs);
+
 	if (IS_BROXTON(dev))
 		ddb_size = BXT_DDB_SIZE;
 	else
@@ -2883,50 +2880,23 @@ skl_ddb_get_pipe_allocation_limits(struct drm_device *dev,
 	ddb_size -= 4; /* 4 blocks for bypass path allocation */
 
 	/*
-	 * FIXME: At the moment we may be called on either in-flight or fully
-	 * committed cstate's.  Once we fully move DDB allocation in the check
-	 * phase, we'll only be called on in-flight states and the 'else'
-	 * branch here will go away.
-	 *
-	 * The 'else' branch is slightly racy here, but it was racy to begin
-	 * with; since it's going away soon, no effort is made to address that.
+	 * If the state doesn't change the active CRTC's, then there's
+	 * no need to recalculate; the existing pipe allocation limits
+	 * should remain unchanged.  Note that we're safe from racing
+	 * commits since any racing commit that changes the active CRTC
+	 * list would need to grab _all_ crtc locks, including the one
+	 * we currently hold.
 	 */
-	if (state) {
-		/*
-		 * If the state doesn't change the active CRTC's, then there's
-		 * no need to recalculate; the existing pipe allocation limits
-		 * should remain unchanged.  Note that we're safe from racing
-		 * commits since any racing commit that changes the active CRTC
-		 * list would need to grab _all_ crtc locks, including the one
-		 * we currently hold.
-		 */
-		if (!intel_state->active_pipe_changes) {
-			*alloc = dev_priv->wm.skl_hw.ddb.pipe[pipe];
-			return;
-		}
-
-		nth_active_pipe = hweight32(intel_state->active_crtcs &
-					    (drm_crtc_mask(for_crtc) - 1));
-		pipe_size = ddb_size / hweight32(intel_state->active_crtcs);
-		alloc->start = nth_active_pipe * ddb_size / *num_active;
-		alloc->end = alloc->start + pipe_size;
-	} else {
-		nth_active_pipe = 0;
-		for_each_crtc(dev, crtc) {
-			if (!to_intel_crtc(crtc)->active)
-				continue;
-
-			if (crtc == for_crtc)
-				break;
-
-			nth_active_pipe++;
-		}
-
-		pipe_size = ddb_size / config->num_pipes_active;
-		alloc->start = nth_active_pipe * ddb_size /
-			config->num_pipes_active;
-		alloc->end = alloc->start + pipe_size;
+	if (!intel_state->active_pipe_changes) {
+		*alloc = dev_priv->wm.skl_hw.ddb.pipe[pipe];
+		return;
 	}
+
+	nth_active_pipe = hweight32(intel_state->active_crtcs &
+				    (drm_crtc_mask(for_crtc) - 1));
+	pipe_size = ddb_size / hweight32(intel_state->active_crtcs);
+	alloc->start = nth_active_pipe * ddb_size / *num_active;
+	alloc->end = alloc->start + pipe_size;
 }
 
 static unsigned int skl_cursor_allocation(int num_active)
@@ -3025,62 +2995,33 @@ skl_get_total_relative_data_rate(struct intel_crtc_state *intel_cstate)
 	struct drm_crtc *crtc = cstate->crtc;
 	struct drm_device *dev = crtc->dev;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+	const struct drm_plane *plane;
 	const struct intel_plane *intel_plane;
+	struct drm_plane_state *pstate;
 	unsigned int rate, total_data_rate = 0;
 	int id;
+	int i;
+
+	if (WARN_ON(!state))
+		return 0;
 
 	/* Calculate and cache data rate for each plane */
-	/*
-	 * FIXME: At the moment this function can be called on either an
-	 * in-flight or a committed state object.  If it's in-flight then we
-	 * only want to re-calculate the plane data rate for planes that are
-	 * part of the transaction (i.e., we don't want to grab any additional
-	 * plane states if we don't have to).  If we're operating on committed
-	 * state, we'll just go ahead and recalculate the plane data rate for
-	 * all planes.
-	 *
-	 * Once we finish moving our DDB allocation to the atomic check phase,
-	 * we'll only be calling this function on in-flight state objects, so
-	 * the 'else' branch here will go away.
-	 */
-	if (state) {
-		struct drm_plane *plane;
-		struct drm_plane_state *pstate;
-		int i;
-
-		for_each_plane_in_state(state, plane, pstate, i) {
-			intel_plane = to_intel_plane(plane);
-			id = skl_wm_plane_id(intel_plane);
-
-			if (intel_plane->pipe != intel_crtc->pipe)
-				continue;
-
-			/* packed/uv */
-			rate = skl_plane_relative_data_rate(intel_cstate,
-							    pstate, 0);
-			intel_cstate->wm.skl.plane_data_rate[id] = rate;
-
-			/* y-plane */
-			rate = skl_plane_relative_data_rate(intel_cstate,
-							    pstate, 1);
-			intel_cstate->wm.skl.plane_y_data_rate[id] = rate;
-		}
-	} else {
-		for_each_intel_plane_on_crtc(dev, intel_crtc, intel_plane) {
-			const struct drm_plane_state *pstate =
-				intel_plane->base.state;
-			int id = skl_wm_plane_id(intel_plane);
+	for_each_plane_in_state(state, plane, pstate, i) {
+		id = skl_wm_plane_id(to_intel_plane(plane));
+		intel_plane = to_intel_plane(plane);
 
-			/* packed/uv */
-			rate = skl_plane_relative_data_rate(intel_cstate,
-							    pstate, 0);
-			intel_cstate->wm.skl.plane_data_rate[id] = rate;
+		if (intel_plane->pipe != intel_crtc->pipe)
+			continue;
 
-			/* y-plane */
-			rate = skl_plane_relative_data_rate(intel_cstate,
-							    pstate, 1);
-			intel_cstate->wm.skl.plane_y_data_rate[id] = rate;
-		}
+		/* packed/uv */
+		rate = skl_plane_relative_data_rate(intel_cstate,
+						    pstate, 0);
+		intel_cstate->wm.skl.plane_data_rate[id] = rate;
+
+		/* y-plane */
+		rate = skl_plane_relative_data_rate(intel_cstate,
+						    pstate, 1);
+		intel_cstate->wm.skl.plane_y_data_rate[id] = rate;
 	}
 
 	/* Calculate CRTC's total data rate from cached values */
@@ -3104,8 +3045,6 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
 	struct drm_atomic_state *state = cstate->base.state;
 	struct drm_crtc *crtc = cstate->base.crtc;
 	struct drm_device *dev = crtc->dev;
-	struct drm_i915_private *dev_priv = to_i915(dev);
-	struct intel_wm_config *config = &dev_priv->wm.config;
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	struct intel_plane *intel_plane;
 	struct drm_plane *plane;
@@ -3119,6 +3058,9 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
 	int num_active;
 	int id, i;
 
+	if (WARN_ON(!state))
+		return 0;
+
 	if (!cstate->base.active) {
 		ddb->pipe[pipe].start = ddb->pipe[pipe].end = 0;
 		memset(ddb->plane[pipe], 0, sizeof(ddb->plane[pipe]));
@@ -3126,8 +3068,7 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
 		return 0;
 	}
 
-	skl_ddb_get_pipe_allocation_limits(dev, cstate, config, alloc,
-					   &num_active);
+	skl_ddb_get_pipe_allocation_limits(dev, cstate, alloc, &num_active);
 	alloc_size = skl_ddb_entry_size(alloc);
 	if (alloc_size == 0) {
 		memset(ddb->plane[pipe], 0, sizeof(ddb->plane[pipe]));
@@ -3139,53 +3080,31 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
 	ddb->plane[pipe][PLANE_CURSOR].end = alloc->end;
 
 	alloc_size -= cursor_blocks;
-	alloc->end -= cursor_blocks;
 
 	/* 1. Allocate the mininum required blocks for each active plane */
-	/*
-	 * TODO: Remove support for already-committed state once we
-	 * only allocate DDB on in-flight states.
-	 */
-	if (state) {
-		for_each_plane_in_state(state, plane, pstate, i) {
-			intel_plane = to_intel_plane(plane);
-			id = skl_wm_plane_id(intel_plane);
-
-			if (intel_plane->pipe != pipe)
-				continue;
-
-			if (!to_intel_plane_state(pstate)->visible) {
-				minimum[id] = 0;
-				y_minimum[id] = 0;
-				continue;
-			}
-			if (plane->type == DRM_PLANE_TYPE_CURSOR) {
-				minimum[id] = 0;
-				y_minimum[id] = 0;
-				continue;
-			}
-
-			minimum[id] = 8;
-			if (pstate->fb->pixel_format == DRM_FORMAT_NV12)
-				y_minimum[id] = 8;
-			else
-				y_minimum[id] = 0;
-		}
-	} else {
-		for_each_intel_plane_on_crtc(dev, intel_crtc, intel_plane) {
-			struct drm_plane *plane = &intel_plane->base;
-			struct drm_framebuffer *fb = plane->state->fb;
-			int id = skl_wm_plane_id(intel_plane);
-
-			if (!to_intel_plane_state(plane->state)->visible)
-				continue;
+	for_each_plane_in_state(state, plane, pstate, i) {
+		intel_plane = to_intel_plane(plane);
+		id = skl_wm_plane_id(intel_plane);
 
-			if (plane->type == DRM_PLANE_TYPE_CURSOR)
-				continue;
+		if (intel_plane->pipe != pipe)
+			continue;
 
-			minimum[id] = 8;
-			y_minimum[id] = (fb->pixel_format == DRM_FORMAT_NV12) ? 8 : 0;
+		if (!to_intel_plane_state(pstate)->visible) {
+			minimum[id] = 0;
+			y_minimum[id] = 0;
+			continue;
+		}
+		if (plane->type == DRM_PLANE_TYPE_CURSOR) {
+			minimum[id] = 0;
+			y_minimum[id] = 0;
+			continue;
 		}
+
+		minimum[id] = 8;
+		if (pstate->fb->pixel_format == DRM_FORMAT_NV12)
+			y_minimum[id] = 8;
+		else
+			y_minimum[id] = 0;
 	}
 
 	for (i = 0; i < PLANE_CURSOR; i++) {
@@ -3736,7 +3655,6 @@ static bool skl_update_pipe_wm(struct drm_crtc *crtc,
 	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
 	struct intel_crtc_state *cstate = to_intel_crtc_state(crtc->state);
 
-	WARN_ON(skl_allocate_pipe_ddb(cstate, ddb) != 0);
 	skl_build_pipe_wm(cstate, ddb, pipe_wm);
 
 	if (!memcmp(&intel_crtc->wm.active.skl, pipe_wm, sizeof(*pipe_wm)))
@@ -3800,16 +3718,6 @@ static void skl_clear_wm(struct skl_wm_values *watermarks, enum pipe pipe)
 	memset(watermarks->plane_trans[pipe],
 	       0, sizeof(uint32_t) * I915_MAX_PLANES);
 	watermarks->plane_trans[pipe][PLANE_CURSOR] = 0;
-
-	/* Clear ddb entries for pipe */
-	memset(&watermarks->ddb.pipe[pipe], 0, sizeof(struct skl_ddb_entry));
-	memset(&watermarks->ddb.plane[pipe], 0,
-	       sizeof(struct skl_ddb_entry) * I915_MAX_PLANES);
-	memset(&watermarks->ddb.y_plane[pipe], 0,
-	       sizeof(struct skl_ddb_entry) * I915_MAX_PLANES);
-	memset(&watermarks->ddb.plane[pipe][PLANE_CURSOR], 0,
-	       sizeof(struct skl_ddb_entry));
-
 }
 
 static int
-- 
2.1.4

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[CI 11/17] drm/i915/gen9: Calculate plane WM's from state

[Matt Roper]

In a future patch we'll want to calculate plane watermarks for in-flight
atomic state rather than the already-committed state.

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index c192028..6073fcb 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3240,16 +3240,14 @@ static bool skl_ddb_allocation_changed(const struct skl_ddb_allocation *new_ddb,
 
 static bool skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
 				 struct intel_crtc_state *cstate,
-				 struct intel_plane *intel_plane,
+				 struct intel_plane_state *intel_pstate,
 				 uint16_t ddb_allocation,
 				 int level,
 				 uint16_t *out_blocks, /* out */
 				 uint8_t *out_lines /* out */)
 {
-	struct drm_plane *plane = &intel_plane->base;
-	struct drm_framebuffer *fb = plane->state->fb;
-	struct intel_plane_state *intel_pstate =
-					to_intel_plane_state(plane->state);
+	struct drm_plane_state *pstate = &intel_pstate->base;
+	struct drm_framebuffer *fb = pstate->fb;
 	uint32_t latency = dev_priv->wm.skl_latency[level];
 	uint32_t method1, method2;
 	uint32_t plane_bytes_per_line, plane_blocks_per_line;
@@ -3264,7 +3262,7 @@ static bool skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
 	width = drm_rect_width(&intel_pstate->src) >> 16;
 	height = drm_rect_height(&intel_pstate->src) >> 16;
 
-	if (intel_rotation_90_or_270(plane->state->rotation))
+	if (intel_rotation_90_or_270(pstate->rotation))
 		swap(width, height);
 
 	cpp = drm_format_plane_cpp(fb->pixel_format, 0);
@@ -3284,7 +3282,7 @@ static bool skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
 	    fb->modifier[0] == I915_FORMAT_MOD_Yf_TILED) {
 		uint32_t min_scanlines = 4;
 		uint32_t y_tile_minimum;
-		if (intel_rotation_90_or_270(plane->state->rotation)) {
+		if (intel_rotation_90_or_270(pstate->rotation)) {
 			int cpp = (fb->pixel_format == DRM_FORMAT_NV12) ?
 				drm_format_plane_cpp(fb->pixel_format, 1) :
 				drm_format_plane_cpp(fb->pixel_format, 0);
@@ -3338,17 +3336,19 @@ static void skl_compute_wm_level(const struct drm_i915_private *dev_priv,
 	struct drm_device *dev = dev_priv->dev;
 	struct intel_crtc *intel_crtc = to_intel_crtc(cstate->base.crtc);
 	struct intel_plane *intel_plane;
+	struct intel_plane_state *intel_pstate;
 	uint16_t ddb_blocks;
 	enum pipe pipe = intel_crtc->pipe;
 
 	for_each_intel_plane_on_crtc(dev, intel_crtc, intel_plane) {
 		int i = skl_wm_plane_id(intel_plane);
 
+		intel_pstate = to_intel_plane_state(intel_plane->base.state);
 		ddb_blocks = skl_ddb_entry_size(&ddb->plane[pipe][i]);
 
 		result->plane_en[i] = skl_compute_plane_wm(dev_priv,
 						cstate,
-						intel_plane,
+						intel_pstate,
 						ddb_blocks,
 						level,
 						&result->plane_res_b[i],
-- 
2.1.4

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[CI 12/17] drm/i915/gen9: Allow watermark calculation on in-flight atomic state (v3)

[Matt Roper]

In an upcoming patch we'll move this calculation to the atomic 'check'
phase so that the display update can be rejected early if no valid
watermark programming is possible.

v2:
 - Drop intel_pstate_for_cstate_plane() helper and add note about how
   the code needs to evolve in the future if we start allowing more than
   one pending commit against a CRTC.  (Maarten)

v3:
 - Only have skl_compute_wm_level calculate watermarks for enabled
   planes; we can just set the other planes on a CRTC to disabled
   without having to look at the plane state.  This is important because
   despite our CRTC lock we can still have racing commits that modify
   a disabled plane's property without turning it on.  (Maarten)

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c | 61 ++++++++++++++++++++++++++++++++---------
 1 file changed, 48 insertions(+), 13 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 6073fcb..4d52402 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3327,23 +3327,56 @@ static bool skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
 	return true;
 }
 
-static void skl_compute_wm_level(const struct drm_i915_private *dev_priv,
-				 struct skl_ddb_allocation *ddb,
-				 struct intel_crtc_state *cstate,
-				 int level,
-				 struct skl_wm_level *result)
+static int
+skl_compute_wm_level(const struct drm_i915_private *dev_priv,
+		     struct skl_ddb_allocation *ddb,
+		     struct intel_crtc_state *cstate,
+		     int level,
+		     struct skl_wm_level *result)
 {
 	struct drm_device *dev = dev_priv->dev;
+	struct drm_atomic_state *state = cstate->base.state;
 	struct intel_crtc *intel_crtc = to_intel_crtc(cstate->base.crtc);
+	struct drm_plane *plane;
 	struct intel_plane *intel_plane;
 	struct intel_plane_state *intel_pstate;
 	uint16_t ddb_blocks;
 	enum pipe pipe = intel_crtc->pipe;
 
-	for_each_intel_plane_on_crtc(dev, intel_crtc, intel_plane) {
+	/*
+	 * We'll only calculate watermarks for planes that are actually
+	 * enabled, so make sure all other planes are set as disabled.
+	 */
+	memset(result, 0, sizeof(*result));
+
+	for_each_intel_plane_mask(dev, intel_plane, cstate->base.plane_mask) {
 		int i = skl_wm_plane_id(intel_plane);
 
-		intel_pstate = to_intel_plane_state(intel_plane->base.state);
+		plane = &intel_plane->base;
+		intel_pstate = NULL;
+		if (state)
+			intel_pstate =
+				intel_atomic_get_existing_plane_state(state,
+								      intel_plane);
+
+		/*
+		 * Note: If we start supporting multiple pending atomic commits
+		 * against the same planes/CRTC's in the future, plane->state
+		 * will no longer be the correct pre-state to use for the
+		 * calculations here and we'll need to change where we get the
+		 * 'unchanged' plane data from.
+		 *
+		 * For now this is fine because we only allow one queued commit
+		 * against a CRTC.  Even if the plane isn't modified by this
+		 * transaction and we don't have a plane lock, we still have
+		 * the CRTC's lock, so we know that no other transactions are
+		 * racing with us to update it.
+		 */
+		if (!intel_pstate)
+			intel_pstate = to_intel_plane_state(plane->state);
+
+		WARN_ON(!intel_pstate->base.fb);
+
 		ddb_blocks = skl_ddb_entry_size(&ddb->plane[pipe][i]);
 
 		result->plane_en[i] = skl_compute_plane_wm(dev_priv,
@@ -3354,6 +3387,8 @@ static void skl_compute_wm_level(const struct drm_i915_private *dev_priv,
 						&result->plane_res_b[i],
 						&result->plane_res_l[i]);
 	}
+
+	return 0;
 }
 
 static uint32_t
@@ -3648,14 +3683,14 @@ static void skl_flush_wm_values(struct drm_i915_private *dev_priv,
 	}
 }
 
-static bool skl_update_pipe_wm(struct drm_crtc *crtc,
+static bool skl_update_pipe_wm(struct drm_crtc_state *cstate,
 			       struct skl_ddb_allocation *ddb, /* out */
 			       struct skl_pipe_wm *pipe_wm /* out */)
 {
-	struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
-	struct intel_crtc_state *cstate = to_intel_crtc_state(crtc->state);
+	struct intel_crtc *intel_crtc = to_intel_crtc(cstate->crtc);
+	struct intel_crtc_state *intel_cstate = to_intel_crtc_state(cstate);
 
-	skl_build_pipe_wm(cstate, ddb, pipe_wm);
+	skl_build_pipe_wm(intel_cstate, ddb, pipe_wm);
 
 	if (!memcmp(&intel_crtc->wm.active.skl, pipe_wm, sizeof(*pipe_wm)))
 		return false;
@@ -3695,7 +3730,7 @@ static void skl_update_other_pipe_wm(struct drm_device *dev,
 		if (!intel_crtc->active)
 			continue;
 
-		wm_changed = skl_update_pipe_wm(&intel_crtc->base,
+		wm_changed = skl_update_pipe_wm(intel_crtc->base.state,
 						&r->ddb, &pipe_wm);
 
 		/*
@@ -3813,7 +3848,7 @@ static void skl_update_wm(struct drm_crtc *crtc)
 
 	skl_clear_wm(results, intel_crtc->pipe);
 
-	if (!skl_update_pipe_wm(crtc, &results->ddb, pipe_wm))
+	if (!skl_update_pipe_wm(crtc->state, &results->ddb, pipe_wm))
 		return;
 
 	skl_compute_wm_results(dev, pipe_wm, results, intel_crtc);
-- 
2.1.4

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[CI 13/17] drm/i915/gen9: Use a bitmask to track dirty pipe watermarks

[Matt Roper]

Slightly easier to work with than an array of bools.

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h |  2 +-
 drivers/gpu/drm/i915/intel_pm.c | 10 +++++-----
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index fdbaf18..5f1f018 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1598,7 +1598,7 @@ struct skl_ddb_allocation {
 };
 
 struct skl_wm_values {
-	bool dirty[I915_MAX_PIPES];
+	unsigned dirty_pipes;
 	struct skl_ddb_allocation ddb;
 	uint32_t wm_linetime[I915_MAX_PIPES];
 	uint32_t plane[I915_MAX_PIPES][I915_MAX_PLANES][8];
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 4d52402..14c2c3e 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3516,7 +3516,7 @@ static void skl_write_wm_values(struct drm_i915_private *dev_priv,
 		int i, level, max_level = ilk_wm_max_level(dev);
 		enum pipe pipe = crtc->pipe;
 
-		if (!new->dirty[pipe])
+		if ((new->dirty_pipes & drm_crtc_mask(&crtc->base)) == 0)
 			continue;
 
 		I915_WRITE(PIPE_WM_LINETIME(pipe), new->wm_linetime[pipe]);
@@ -3741,7 +3741,7 @@ static void skl_update_other_pipe_wm(struct drm_device *dev,
 		WARN_ON(!wm_changed);
 
 		skl_compute_wm_results(dev, &pipe_wm, r, intel_crtc);
-		r->dirty[intel_crtc->pipe] = true;
+		r->dirty_pipes |= drm_crtc_mask(&intel_crtc->base);
 	}
 }
 
@@ -3844,7 +3844,7 @@ static void skl_update_wm(struct drm_crtc *crtc)
 
 
 	/* Clear all dirty flags */
-	memset(results->dirty, 0, sizeof(bool) * I915_MAX_PIPES);
+	results->dirty_pipes = 0;
 
 	skl_clear_wm(results, intel_crtc->pipe);
 
@@ -3852,7 +3852,7 @@ static void skl_update_wm(struct drm_crtc *crtc)
 		return;
 
 	skl_compute_wm_results(dev, pipe_wm, results, intel_crtc);
-	results->dirty[intel_crtc->pipe] = true;
+	results->dirty_pipes |= drm_crtc_mask(&intel_crtc->base);
 
 	skl_update_other_pipe_wm(dev, crtc, results);
 	skl_write_wm_values(dev_priv, results);
@@ -4011,7 +4011,7 @@ static void skl_pipe_wm_get_hw_state(struct drm_crtc *crtc)
 	if (!intel_crtc->active)
 		return;
 
-	hw->dirty[pipe] = true;
+	hw->dirty_pipes |= drm_crtc_mask(crtc);
 
 	active->linetime = hw->wm_linetime[pipe];
 
-- 
2.1.4

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[CI 14/17] drm/i915/gen9: Propagate watermark calculation failures up the call chain

[Matt Roper]

Once we move watermark calculation to the atomic check phase, we'll want
to start rejecting display configurations that exceed out watermark
limits.  At the moment we just assume that there's always a valid set of
watermarks, even though this may not actually be true.  Let's prepare by
passing return codes up through the call stack in preparation.

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_display.c | 10 ++--
 drivers/gpu/drm/i915/intel_pm.c      | 90 ++++++++++++++++++++++--------------
 2 files changed, 61 insertions(+), 39 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 294358c..33f6c4b 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13310,7 +13310,7 @@ static int intel_modeset_checks(struct drm_atomic_state *state)
  * phase.  The code here should be run after the per-crtc and per-plane 'check'
  * handlers to ensure that all derived state has been updated.
  */
-static void calc_watermark_data(struct drm_atomic_state *state)
+static int calc_watermark_data(struct drm_atomic_state *state)
 {
 	struct drm_device *dev = state->dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
@@ -13346,7 +13346,9 @@ static void calc_watermark_data(struct drm_atomic_state *state)
 
 	/* Is there platform-specific watermark information to calculate? */
 	if (dev_priv->display.compute_global_watermarks)
-		dev_priv->display.compute_global_watermarks(state);
+		return dev_priv->display.compute_global_watermarks(state);
+
+	return 0;
 }
 
 /**
@@ -13433,9 +13435,7 @@ static int intel_atomic_check(struct drm_device *dev,
 		return ret;
 
 	intel_fbc_choose_crtc(dev_priv, state);
-	calc_watermark_data(state);
-
-	return 0;
+	return calc_watermark_data(state);
 }
 
 static int intel_atomic_prepare_commit(struct drm_device *dev,
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 14c2c3e..1d8407a 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3238,13 +3238,14 @@ static bool skl_ddb_allocation_changed(const struct skl_ddb_allocation *new_ddb,
 	return false;
 }
 
-static bool skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
-				 struct intel_crtc_state *cstate,
-				 struct intel_plane_state *intel_pstate,
-				 uint16_t ddb_allocation,
-				 int level,
-				 uint16_t *out_blocks, /* out */
-				 uint8_t *out_lines /* out */)
+static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
+				struct intel_crtc_state *cstate,
+				struct intel_plane_state *intel_pstate,
+				uint16_t ddb_allocation,
+				int level,
+				uint16_t *out_blocks, /* out */
+				uint8_t *out_lines, /* out */
+				bool *enabled /* out */)
 {
 	struct drm_plane_state *pstate = &intel_pstate->base;
 	struct drm_framebuffer *fb = pstate->fb;
@@ -3256,8 +3257,10 @@ static bool skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
 	uint8_t cpp;
 	uint32_t width = 0, height = 0;
 
-	if (latency == 0 || !cstate->base.active || !intel_pstate->visible)
-		return false;
+	if (latency == 0 || !cstate->base.active || !intel_pstate->visible) {
+		*enabled = false;
+		return 0;
+	}
 
 	width = drm_rect_width(&intel_pstate->src) >> 16;
 	height = drm_rect_height(&intel_pstate->src) >> 16;
@@ -3318,13 +3321,16 @@ static bool skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
 			res_blocks++;
 	}
 
-	if (res_blocks >= ddb_allocation || res_lines > 31)
-		return false;
+	if (res_blocks >= ddb_allocation || res_lines > 31) {
+		*enabled = false;
+		return 0;
+	}
 
 	*out_blocks = res_blocks;
 	*out_lines = res_lines;
+	*enabled = true;
 
-	return true;
+	return 0;
 }
 
 static int
@@ -3342,6 +3348,7 @@ skl_compute_wm_level(const struct drm_i915_private *dev_priv,
 	struct intel_plane_state *intel_pstate;
 	uint16_t ddb_blocks;
 	enum pipe pipe = intel_crtc->pipe;
+	int ret;
 
 	/*
 	 * We'll only calculate watermarks for planes that are actually
@@ -3379,13 +3386,16 @@ skl_compute_wm_level(const struct drm_i915_private *dev_priv,
 
 		ddb_blocks = skl_ddb_entry_size(&ddb->plane[pipe][i]);
 
-		result->plane_en[i] = skl_compute_plane_wm(dev_priv,
-						cstate,
-						intel_pstate,
-						ddb_blocks,
-						level,
-						&result->plane_res_b[i],
-						&result->plane_res_l[i]);
+		ret = skl_compute_plane_wm(dev_priv,
+					   cstate,
+					   intel_pstate,
+					   ddb_blocks,
+					   level,
+					   &result->plane_res_b[i],
+					   &result->plane_res_l[i],
+					   &result->plane_en[i]);
+		if (ret)
+			return ret;
 	}
 
 	return 0;
@@ -3422,21 +3432,26 @@ static void skl_compute_transition_wm(struct intel_crtc_state *cstate,
 	}
 }
 
-static void skl_build_pipe_wm(struct intel_crtc_state *cstate,
-			      struct skl_ddb_allocation *ddb,
-			      struct skl_pipe_wm *pipe_wm)
+static int skl_build_pipe_wm(struct intel_crtc_state *cstate,
+			     struct skl_ddb_allocation *ddb,
+			     struct skl_pipe_wm *pipe_wm)
 {
 	struct drm_device *dev = cstate->base.crtc->dev;
 	const struct drm_i915_private *dev_priv = dev->dev_private;
 	int level, max_level = ilk_wm_max_level(dev);
+	int ret;
 
 	for (level = 0; level <= max_level; level++) {
-		skl_compute_wm_level(dev_priv, ddb, cstate,
-				     level, &pipe_wm->wm[level]);
+		ret = skl_compute_wm_level(dev_priv, ddb, cstate,
+					   level, &pipe_wm->wm[level]);
+		if (ret)
+			return ret;
 	}
 	pipe_wm->linetime = skl_compute_linetime_wm(cstate);
 
 	skl_compute_transition_wm(cstate, &pipe_wm->trans_wm);
+
+	return 0;
 }
 
 static void skl_compute_wm_results(struct drm_device *dev,
@@ -3683,21 +3698,27 @@ static void skl_flush_wm_values(struct drm_i915_private *dev_priv,
 	}
 }
 
-static bool skl_update_pipe_wm(struct drm_crtc_state *cstate,
-			       struct skl_ddb_allocation *ddb, /* out */
-			       struct skl_pipe_wm *pipe_wm /* out */)
+static int skl_update_pipe_wm(struct drm_crtc_state *cstate,
+			      struct skl_ddb_allocation *ddb, /* out */
+			      struct skl_pipe_wm *pipe_wm, /* out */
+			      bool *changed /* out */)
 {
 	struct intel_crtc *intel_crtc = to_intel_crtc(cstate->crtc);
 	struct intel_crtc_state *intel_cstate = to_intel_crtc_state(cstate);
+	int ret;
 
-	skl_build_pipe_wm(intel_cstate, ddb, pipe_wm);
+	ret = skl_build_pipe_wm(intel_cstate, ddb, pipe_wm);
+	if (ret)
+		return ret;
 
 	if (!memcmp(&intel_crtc->wm.active.skl, pipe_wm, sizeof(*pipe_wm)))
-		return false;
+		*changed = false;
+	else
+		*changed = true;
 
 	intel_crtc->wm.active.skl = *pipe_wm;
 
-	return true;
+	return 0;
 }
 
 static void skl_update_other_pipe_wm(struct drm_device *dev,
@@ -3730,8 +3751,8 @@ static void skl_update_other_pipe_wm(struct drm_device *dev,
 		if (!intel_crtc->active)
 			continue;
 
-		wm_changed = skl_update_pipe_wm(intel_crtc->base.state,
-						&r->ddb, &pipe_wm);
+		skl_update_pipe_wm(intel_crtc->base.state,
+				   &r->ddb, &pipe_wm, &wm_changed);
 
 		/*
 		 * If we end up re-computing the other pipe WM values, it's
@@ -3841,14 +3862,15 @@ static void skl_update_wm(struct drm_crtc *crtc)
 	struct skl_wm_values *results = &dev_priv->wm.skl_results;
 	struct intel_crtc_state *cstate = to_intel_crtc_state(crtc->state);
 	struct skl_pipe_wm *pipe_wm = &cstate->wm.skl.optimal;
-
+	bool wm_changed;
 
 	/* Clear all dirty flags */
 	results->dirty_pipes = 0;
 
 	skl_clear_wm(results, intel_crtc->pipe);
 
-	if (!skl_update_pipe_wm(crtc->state, &results->ddb, pipe_wm))
+	skl_update_pipe_wm(crtc->state, &results->ddb, pipe_wm, &wm_changed);
+	if (!wm_changed)
 		return;
 
 	skl_compute_wm_results(dev, pipe_wm, results, intel_crtc);
-- 
2.1.4

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[CI 15/17] drm/i915/gen9: Calculate watermarks during atomic 'check'

[Matt Roper]

Moving watermark calculation into the check phase will allow us to to
reject display configurations for which there are no valid watermark
values before we start trying to program the hardware (although those
tests will come in a subsequent patch).

Another advantage of moving this calculation to the check phase is that
we can calculate the watermarks in a single shot as part of the atomic
transaction.  The watermark interfaces we inherited from our legacy
modesetting days are a bit broken in the atomic design because they use
per-crtc entry points but actually re-calculate and re-program something
that is really more of a global state.  That worked okay in the legacy
modesetting world because operations only ever updated a single CRTC at
a time.  However in the atomic world, a transaction can involve multiple
CRTC's, which means we wind up computing and programming the watermarks
NxN times (where N is the number of CRTC's involved).  With this patch
we eliminate the redundant re-calculation of watermark data for atomic
states (which was the cause of the WARN_ON(!wm_changed) problems that
have plagued us for a while).

We still need to work on the 'commit' side of watermark handling so that
we aren't doing redundant NxN programming of watermarks, but that's
content for future patches.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=89055
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92181
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Tested-by: Daniel Stone <daniels@collabora.com>
---
 drivers/gpu/drm/i915/intel_display.c |   2 +-
 drivers/gpu/drm/i915/intel_drv.h     |   2 +-
 drivers/gpu/drm/i915/intel_pm.c      | 138 +++++++++++++----------------------
 3 files changed, 52 insertions(+), 90 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 33f6c4b..790ae7a 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13601,7 +13601,7 @@ static int intel_atomic_commit(struct drm_device *dev,
 	drm_atomic_helper_swap_state(dev, state);
 	dev_priv->wm.config = intel_state->wm_config;
 	dev_priv->wm.distrust_bios_wm = false;
-	dev_priv->wm.skl_results.ddb = intel_state->ddb;
+	dev_priv->wm.skl_results = intel_state->wm_results;
 	intel_shared_dpll_commit(state);
 
 	if (intel_state->modeset) {
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index c9a4c42..b477978 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -314,7 +314,7 @@ struct intel_atomic_state {
 	bool skip_intermediate_wm;
 
 	/* Gen9+ only */
-	struct skl_ddb_allocation ddb;
+	struct skl_wm_values wm_results;
 };
 
 struct intel_plane_state {
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 1d8407a..3b00e0d 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3221,23 +3221,6 @@ static uint32_t skl_wm_method2(uint32_t pixel_rate, uint32_t pipe_htotal,
 	return ret;
 }
 
-static bool skl_ddb_allocation_changed(const struct skl_ddb_allocation *new_ddb,
-				       const struct intel_crtc *intel_crtc)
-{
-	struct drm_device *dev = intel_crtc->base.dev;
-	struct drm_i915_private *dev_priv = dev->dev_private;
-	const struct skl_ddb_allocation *cur_ddb = &dev_priv->wm.skl_hw.ddb;
-
-	/*
-	 * If ddb allocation of pipes changed, it may require recalculation of
-	 * watermarks
-	 */
-	if (memcmp(new_ddb->pipe, cur_ddb->pipe, sizeof(new_ddb->pipe)))
-		return true;
-
-	return false;
-}
-
 static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
 				struct intel_crtc_state *cstate,
 				struct intel_plane_state *intel_pstate,
@@ -3716,66 +3699,9 @@ static int skl_update_pipe_wm(struct drm_crtc_state *cstate,
 	else
 		*changed = true;
 
-	intel_crtc->wm.active.skl = *pipe_wm;
-
 	return 0;
 }
 
-static void skl_update_other_pipe_wm(struct drm_device *dev,
-				     struct drm_crtc *crtc,
-				     struct skl_wm_values *r)
-{
-	struct intel_crtc *intel_crtc;
-	struct intel_crtc *this_crtc = to_intel_crtc(crtc);
-
-	/*
-	 * If the WM update hasn't changed the allocation for this_crtc (the
-	 * crtc we are currently computing the new WM values for), other
-	 * enabled crtcs will keep the same allocation and we don't need to
-	 * recompute anything for them.
-	 */
-	if (!skl_ddb_allocation_changed(&r->ddb, this_crtc))
-		return;
-
-	/*
-	 * Otherwise, because of this_crtc being freshly enabled/disabled, the
-	 * other active pipes need new DDB allocation and WM values.
-	 */
-	for_each_intel_crtc(dev, intel_crtc) {
-		struct skl_pipe_wm pipe_wm = {};
-		bool wm_changed;
-
-		if (this_crtc->pipe == intel_crtc->pipe)
-			continue;
-
-		if (!intel_crtc->active)
-			continue;
-
-		skl_update_pipe_wm(intel_crtc->base.state,
-				   &r->ddb, &pipe_wm, &wm_changed);
-
-		/*
-		 * If we end up re-computing the other pipe WM values, it's
-		 * because it was really needed, so we expect the WM values to
-		 * be different.
-		 */
-		WARN_ON(!wm_changed);
-
-		skl_compute_wm_results(dev, &pipe_wm, r, intel_crtc);
-		r->dirty_pipes |= drm_crtc_mask(&intel_crtc->base);
-	}
-}
-
-static void skl_clear_wm(struct skl_wm_values *watermarks, enum pipe pipe)
-{
-	watermarks->wm_linetime[pipe] = 0;
-	memset(watermarks->plane[pipe], 0,
-	       sizeof(uint32_t) * 8 * I915_MAX_PLANES);
-	memset(watermarks->plane_trans[pipe],
-	       0, sizeof(uint32_t) * I915_MAX_PLANES);
-	watermarks->plane_trans[pipe][PLANE_CURSOR] = 0;
-}
-
 static int
 skl_compute_ddb(struct drm_atomic_state *state)
 {
@@ -3783,6 +3709,7 @@ skl_compute_ddb(struct drm_atomic_state *state)
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
 	struct intel_crtc *intel_crtc;
+	struct skl_ddb_allocation *ddb = &intel_state->wm_results.ddb;
 	unsigned realloc_pipes = dev_priv->active_crtcs;
 	int ret;
 
@@ -3808,8 +3735,10 @@ skl_compute_ddb(struct drm_atomic_state *state)
 	 * any other display updates race with this transaction, so we need
 	 * to grab the lock on *all* CRTC's.
 	 */
-	if (intel_state->active_pipe_changes)
+	if (intel_state->active_pipe_changes) {
 		realloc_pipes = ~0;
+		intel_state->wm_results.dirty_pipes = ~0;
+	}
 
 	for_each_intel_crtc_mask(dev, intel_crtc, realloc_pipes) {
 		struct intel_crtc_state *cstate;
@@ -3818,7 +3747,7 @@ skl_compute_ddb(struct drm_atomic_state *state)
 		if (IS_ERR(cstate))
 			return PTR_ERR(cstate);
 
-		ret = skl_allocate_pipe_ddb(cstate, &intel_state->ddb);
+		ret = skl_allocate_pipe_ddb(cstate, ddb);
 		if (ret)
 			return ret;
 	}
@@ -3831,8 +3760,11 @@ skl_compute_wm(struct drm_atomic_state *state)
 {
 	struct drm_crtc *crtc;
 	struct drm_crtc_state *cstate;
-	int ret, i;
+	struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
+	struct skl_wm_values *results = &intel_state->wm_results;
+	struct skl_pipe_wm *pipe_wm;
 	bool changed = false;
+	int ret, i;
 
 	/*
 	 * If this transaction isn't actually touching any CRTC's, don't
@@ -3847,10 +3779,45 @@ skl_compute_wm(struct drm_atomic_state *state)
 	if (!changed)
 		return 0;
 
+	/* Clear all dirty flags */
+	results->dirty_pipes = 0;
+
 	ret = skl_compute_ddb(state);
 	if (ret)
 		return ret;
 
+	/*
+	 * Calculate WM's for all pipes that are part of this transaction.
+	 * Note that the DDB allocation above may have added more CRTC's that
+	 * weren't otherwise being modified (and set bits in dirty_pipes) if
+	 * pipe allocations had to change.
+	 *
+	 * FIXME:  Now that we're doing this in the atomic check phase, we
+	 * should allow skl_update_pipe_wm() to return failure in cases where
+	 * no suitable watermark values can be found.
+	 */
+	for_each_crtc_in_state(state, crtc, cstate, i) {
+		struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+		struct intel_crtc_state *intel_cstate =
+			to_intel_crtc_state(cstate);
+
+		pipe_wm = &intel_cstate->wm.skl.optimal;
+		ret = skl_update_pipe_wm(cstate, &results->ddb, pipe_wm,
+					 &changed);
+		if (ret)
+			return ret;
+
+		if (changed)
+			results->dirty_pipes |= drm_crtc_mask(crtc);
+
+		if ((results->dirty_pipes & drm_crtc_mask(crtc)) == 0)
+			/* This pipe's WM's did not change */
+			continue;
+
+		intel_cstate->update_wm_pre = true;
+		skl_compute_wm_results(crtc->dev, pipe_wm, results, intel_crtc);
+	}
+
 	return 0;
 }
 
@@ -3862,26 +3829,21 @@ static void skl_update_wm(struct drm_crtc *crtc)
 	struct skl_wm_values *results = &dev_priv->wm.skl_results;
 	struct intel_crtc_state *cstate = to_intel_crtc_state(crtc->state);
 	struct skl_pipe_wm *pipe_wm = &cstate->wm.skl.optimal;
-	bool wm_changed;
 
-	/* Clear all dirty flags */
-	results->dirty_pipes = 0;
-
-	skl_clear_wm(results, intel_crtc->pipe);
-
-	skl_update_pipe_wm(crtc->state, &results->ddb, pipe_wm, &wm_changed);
-	if (!wm_changed)
+	if ((results->dirty_pipes & drm_crtc_mask(crtc)) == 0)
 		return;
 
-	skl_compute_wm_results(dev, pipe_wm, results, intel_crtc);
-	results->dirty_pipes |= drm_crtc_mask(&intel_crtc->base);
+	intel_crtc->wm.active.skl = *pipe_wm;
+
+	mutex_lock(&dev_priv->wm.wm_mutex);
 
-	skl_update_other_pipe_wm(dev, crtc, results);
 	skl_write_wm_values(dev_priv, results);
 	skl_flush_wm_values(dev_priv, results);
 
 	/* store the new configuration */
 	dev_priv->wm.skl_hw = *results;
+
+	mutex_unlock(&dev_priv->wm.wm_mutex);
 }
 
 static void ilk_compute_wm_config(struct drm_device *dev,
-- 
2.1.4

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[CI 16/17] drm/i915/gen9: Reject display updates that exceed wm limitations (v2)

[Matt Roper]

If we can't find any valid level 0 watermark values for the requested
atomic transaction, reject the configuration before we try to start
programming the hardware.

v2:
 - Add extra debugging output when we reject level 0 watermarks so that
   we can more easily debug how/why they were rejected.

Cc: Lyude Paul <cpaul@redhat.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/i915/intel_pm.c | 17 ++++++++++++++++-
 1 file changed, 16 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 3b00e0d..5c925f3 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3306,7 +3306,22 @@ static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
 
 	if (res_blocks >= ddb_allocation || res_lines > 31) {
 		*enabled = false;
-		return 0;
+
+		/*
+		 * If there are no valid level 0 watermarks, then we can't
+		 * support this display configuration.
+		 */
+		if (level) {
+			return 0;
+		} else {
+			DRM_DEBUG_KMS("Requested display configuration exceeds system watermark limitations\n");
+			DRM_DEBUG_KMS("Plane %d.%d: blocks required = %u/%u, lines required = %u/31\n",
+				      to_intel_crtc(cstate->base.crtc)->pipe,
+				      skl_wm_plane_id(to_intel_plane(pstate->plane)),
+				      res_blocks, ddb_allocation, res_lines);
+
+			return -EINVAL;
+		}
 	}
 
 	*out_blocks = res_blocks;
-- 
2.1.4

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[CI 17/17] drm/i915: Remove wm_config from dev_priv/intel_atomic_state

[Matt Roper]

We calculate the watermark config into intel_atomic_state and then save
it into dev_priv, but never actually use it from there.  This is
left-over from some early ILK-style watermark programming designs that
got changed over time.

Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h      |  3 ---
 drivers/gpu/drm/i915/intel_display.c | 31 -------------------------------
 drivers/gpu/drm/i915/intel_drv.h     |  1 -
 3 files changed, 35 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 5f1f018..952e194 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1975,9 +1975,6 @@ struct drm_i915_private {
 		 */
 		uint16_t skl_latency[8];
 
-		/* Committed wm config */
-		struct intel_wm_config config;
-
 		/*
 		 * The skl_wm_values structure is a bit too big for stack
 		 * allocation, so we keep the staging struct where we store
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 790ae7a..5a8f7ac 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13314,35 +13314,6 @@ static int calc_watermark_data(struct drm_atomic_state *state)
 {
 	struct drm_device *dev = state->dev;
 	struct drm_i915_private *dev_priv = to_i915(dev);
-	struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
-	struct drm_crtc *crtc;
-	struct drm_crtc_state *cstate;
-	struct drm_plane *plane;
-	struct drm_plane_state *pstate;
-
-	/*
-	 * Calculate watermark configuration details now that derived
-	 * plane/crtc state is all properly updated.
-	 */
-	drm_for_each_crtc(crtc, dev) {
-		cstate = drm_atomic_get_existing_crtc_state(state, crtc) ?:
-			crtc->state;
-
-		if (cstate->active)
-			intel_state->wm_config.num_pipes_active++;
-	}
-	drm_for_each_legacy_plane(plane, dev) {
-		pstate = drm_atomic_get_existing_plane_state(state, plane) ?:
-			plane->state;
-
-		if (!to_intel_plane_state(pstate)->visible)
-			continue;
-
-		intel_state->wm_config.sprites_enabled = true;
-		if (pstate->crtc_w != pstate->src_w >> 16 ||
-		    pstate->crtc_h != pstate->src_h >> 16)
-			intel_state->wm_config.sprites_scaled = true;
-	}
 
 	/* Is there platform-specific watermark information to calculate? */
 	if (dev_priv->display.compute_global_watermarks)
@@ -13599,7 +13570,6 @@ static int intel_atomic_commit(struct drm_device *dev,
 	}
 
 	drm_atomic_helper_swap_state(dev, state);
-	dev_priv->wm.config = intel_state->wm_config;
 	dev_priv->wm.distrust_bios_wm = false;
 	dev_priv->wm.skl_results = intel_state->wm_results;
 	intel_shared_dpll_commit(state);
@@ -15368,7 +15338,6 @@ retry:
 	}
 
 	/* Write calculated watermark values back */
-	to_i915(dev)->wm.config = to_intel_atomic_state(state)->wm_config;
 	for_each_crtc_in_state(state, crtc, cstate, i) {
 		struct intel_crtc_state *cs = to_intel_crtc_state(cstate);
 
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index b477978..1ba34e7 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -305,7 +305,6 @@ struct intel_atomic_state {
 	unsigned int min_pixclk[I915_MAX_PIPES];
 
 	struct intel_shared_dpll_config shared_dpll[I915_NUM_PLLS];
-	struct intel_wm_config wm_config;
 
 	/*
 	 * Current watermarks can't be trusted during hardware readout, so
-- 
2.1.4

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✗ Ro.CI.BAT: failure for Pre-calculate SKL-style atomic watermarks (final CI run)

[Patchwork]

== Series Details ==

Series: Pre-calculate SKL-style atomic watermarks (final CI run)
URL   : https://patchwork.freedesktop.org/series/7075/
State : failure

== Summary ==

Series 7075v1 Pre-calculate SKL-style atomic watermarks (final CI run)
http://patchwork.freedesktop.org/api/1.0/series/7075/revisions/1/mbox

Test drv_module_reload_basic:
                pass       -> DMESG-WARN (ro-skl-i7-6700hq)
Test gem_exec_flush:
        Subgroup basic-batch-kernel-default-cmd:
                fail       -> PASS       (ro-byt-n2820)
                pass       -> FAIL       (fi-byt-n2820)
Test kms_flip:
        Subgroup basic-flip-vs-wf_vblank:
                fail       -> PASS       (ro-byt-n2820)
        Subgroup basic-plain-flip:
                pass       -> DMESG-WARN (ro-skl-i7-6700hq)
Test kms_pipe_crc_basic:
        Subgroup read-crc-pipe-b-frame-sequence:
                skip       -> PASS       (fi-skl-i5-6260u)
        Subgroup read-crc-pipe-c:
                skip       -> PASS       (fi-skl-i5-6260u)
        Subgroup read-crc-pipe-c-frame-sequence:
                pass       -> SKIP       (fi-skl-i5-6260u)

fi-bsw-n3050     total:218  pass:174  dwarn:0   dfail:0   fail:2   skip:42 
fi-byt-n2820     total:218  pass:174  dwarn:0   dfail:0   fail:3   skip:41 
fi-hsw-i7-4770k  total:219  pass:197  dwarn:0   dfail:0   fail:1   skip:21 
fi-hsw-i7-4770r  total:219  pass:193  dwarn:0   dfail:0   fail:0   skip:26 
fi-kbl-y         total:219  pass:191  dwarn:1   dfail:0   fail:2   skip:25 
fi-skl-i5-6260u  total:219  pass:206  dwarn:0   dfail:0   fail:0   skip:13 
fi-skl-i7-6700k  total:219  pass:191  dwarn:0   dfail:0   fail:0   skip:28 
ro-bdw-i5-5250u  total:219  pass:181  dwarn:0   dfail:0   fail:0   skip:38 
ro-bdw-i7-5557U  total:219  pass:206  dwarn:0   dfail:0   fail:0   skip:13 
ro-bdw-i7-5600u  total:219  pass:187  dwarn:0   dfail:0   fail:0   skip:32 
ro-bsw-n3050     total:219  pass:175  dwarn:0   dfail:0   fail:2   skip:42 
ro-byt-n2820     total:218  pass:175  dwarn:0   dfail:0   fail:2   skip:41 
ro-hsw-i3-4010u  total:218  pass:193  dwarn:0   dfail:0   fail:0   skip:25 
ro-hsw-i7-4770r  total:219  pass:194  dwarn:0   dfail:0   fail:0   skip:25 
ro-ilk-i7-620lm  total:219  pass:151  dwarn:0   dfail:0   fail:1   skip:67 
ro-ilk1-i5-650   total:214  pass:151  dwarn:0   dfail:0   fail:2   skip:61 
ro-ivb-i7-3770   total:219  pass:183  dwarn:0   dfail:0   fail:0   skip:36 
ro-ivb2-i7-3770  total:219  pass:186  dwarn:0   dfail:0   fail:1   skip:32 
ro-skl-i7-6700hq total:214  pass:187  dwarn:2   dfail:0   fail:0   skip:25 
ro-snb-i7-2620M  total:219  pass:177  dwarn:0   dfail:0   fail:1   skip:41 

Results at /archive/results/CI_IGT_test/RO_Patchwork_865/

86821b8 drm-intel-nightly: 2016y-05m-12d-14h-21m-45s UTC integration manifest
ec7a1fe drm/i915: Remove wm_config from dev_priv/intel_atomic_state
3246c7c drm/i915/gen9: Reject display updates that exceed wm limitations (v2)
bd92514 drm/i915/gen9: Calculate watermarks during atomic 'check'
bae2cad drm/i915/gen9: Propagate watermark calculation failures up the call chain
4688d77 drm/i915/gen9: Use a bitmask to track dirty pipe watermarks
fa7bdc5 drm/i915/gen9: Allow watermark calculation on in-flight atomic state (v3)
51c3fb7 drm/i915/gen9: Calculate plane WM's from state
68f5014 drm/i915/gen9: Drop re-allocation of DDB at atomic commit (v2)
7bcda0b drm/i915/gen9: Compute DDB allocation at atomic check time (v4)
fc8ab58 drm/i915: Add distrust_bios_wm flag to dev_priv (v2)
7fb6e30 drm/i915/gen9: Allow skl_allocate_pipe_ddb() to operate on in-flight state (v3)
eb86bae drm/i915: Track whether an atomic transaction changes the active CRTC's
ab88901 drm/i915/gen9: Store plane minimum blocks in CRTC wm state (v2)
1c6b903 drm/i915/gen9: Allow calculation of data rate for in-flight state (v2)
2405888 drm/i915/gen9: Cache plane data rates in CRTC state
704afc7 drm/i915: Rename s/skl_compute_pipe_wm/skl_build_pipe_wm/
a8c69f2 drm/i915: Reorganize WM structs/unions in CRTC state

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[CI 15/17] drm/i915/gen9: Calculate watermarks during atomic 'check' (v2)

[Matt Roper]

Moving watermark calculation into the check phase will allow us to to
reject display configurations for which there are no valid watermark
values before we start trying to program the hardware (although those
tests will come in a subsequent patch).

Another advantage of moving this calculation to the check phase is that
we can calculate the watermarks in a single shot as part of the atomic
transaction.  The watermark interfaces we inherited from our legacy
modesetting days are a bit broken in the atomic design because they use
per-crtc entry points but actually re-calculate and re-program something
that is really more of a global state.  That worked okay in the legacy
modesetting world because operations only ever updated a single CRTC at
a time.  However in the atomic world, a transaction can involve multiple
CRTC's, which means we wind up computing and programming the watermarks
NxN times (where N is the number of CRTC's involved).  With this patch
we eliminate the redundant re-calculation of watermark data for atomic
states (which was the cause of the WARN_ON(!wm_changed) problems that
have plagued us for a while).

We still need to work on the 'commit' side of watermark handling so that
we aren't doing redundant NxN programming of watermarks, but that's
content for future patches.

v2:
 - Bail out of skl_write_wm_values() if the CRTC isn't active.  Now that
   we set dirty_pipes to ~0 if the active pipes change (because
   we need to deal with DDB changes), we can now wind up here for
   disabled pipes, whereas we couldn't before.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=89055
Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=92181
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@intel.com>
Tested-by: Daniel Stone <daniels@collabora.com>
---
 drivers/gpu/drm/i915/intel_display.c |   2 +-
 drivers/gpu/drm/i915/intel_drv.h     |   2 +-
 drivers/gpu/drm/i915/intel_pm.c      | 140 +++++++++++++----------------------
 3 files changed, 54 insertions(+), 90 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 33f6c4b..790ae7a 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -13601,7 +13601,7 @@ static int intel_atomic_commit(struct drm_device *dev,
 	drm_atomic_helper_swap_state(dev, state);
 	dev_priv->wm.config = intel_state->wm_config;
 	dev_priv->wm.distrust_bios_wm = false;
-	dev_priv->wm.skl_results.ddb = intel_state->ddb;
+	dev_priv->wm.skl_results = intel_state->wm_results;
 	intel_shared_dpll_commit(state);
 
 	if (intel_state->modeset) {
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index c9a4c42..b477978 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -314,7 +314,7 @@ struct intel_atomic_state {
 	bool skip_intermediate_wm;
 
 	/* Gen9+ only */
-	struct skl_ddb_allocation ddb;
+	struct skl_wm_values wm_results;
 };
 
 struct intel_plane_state {
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 1d8407a..f9dff5e 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3221,23 +3221,6 @@ static uint32_t skl_wm_method2(uint32_t pixel_rate, uint32_t pipe_htotal,
 	return ret;
 }
 
-static bool skl_ddb_allocation_changed(const struct skl_ddb_allocation *new_ddb,
-				       const struct intel_crtc *intel_crtc)
-{
-	struct drm_device *dev = intel_crtc->base.dev;
-	struct drm_i915_private *dev_priv = dev->dev_private;
-	const struct skl_ddb_allocation *cur_ddb = &dev_priv->wm.skl_hw.ddb;
-
-	/*
-	 * If ddb allocation of pipes changed, it may require recalculation of
-	 * watermarks
-	 */
-	if (memcmp(new_ddb->pipe, cur_ddb->pipe, sizeof(new_ddb->pipe)))
-		return true;
-
-	return false;
-}
-
 static int skl_compute_plane_wm(const struct drm_i915_private *dev_priv,
 				struct intel_crtc_state *cstate,
 				struct intel_plane_state *intel_pstate,
@@ -3533,6 +3516,8 @@ static void skl_write_wm_values(struct drm_i915_private *dev_priv,
 
 		if ((new->dirty_pipes & drm_crtc_mask(&crtc->base)) == 0)
 			continue;
+		if (!crtc->active)
+			continue;
 
 		I915_WRITE(PIPE_WM_LINETIME(pipe), new->wm_linetime[pipe]);
 
@@ -3716,66 +3701,9 @@ static int skl_update_pipe_wm(struct drm_crtc_state *cstate,
 	else
 		*changed = true;
 
-	intel_crtc->wm.active.skl = *pipe_wm;
-
 	return 0;
 }
 
-static void skl_update_other_pipe_wm(struct drm_device *dev,
-				     struct drm_crtc *crtc,
-				     struct skl_wm_values *r)
-{
-	struct intel_crtc *intel_crtc;
-	struct intel_crtc *this_crtc = to_intel_crtc(crtc);
-
-	/*
-	 * If the WM update hasn't changed the allocation for this_crtc (the
-	 * crtc we are currently computing the new WM values for), other
-	 * enabled crtcs will keep the same allocation and we don't need to
-	 * recompute anything for them.
-	 */
-	if (!skl_ddb_allocation_changed(&r->ddb, this_crtc))
-		return;
-
-	/*
-	 * Otherwise, because of this_crtc being freshly enabled/disabled, the
-	 * other active pipes need new DDB allocation and WM values.
-	 */
-	for_each_intel_crtc(dev, intel_crtc) {
-		struct skl_pipe_wm pipe_wm = {};
-		bool wm_changed;
-
-		if (this_crtc->pipe == intel_crtc->pipe)
-			continue;
-
-		if (!intel_crtc->active)
-			continue;
-
-		skl_update_pipe_wm(intel_crtc->base.state,
-				   &r->ddb, &pipe_wm, &wm_changed);
-
-		/*
-		 * If we end up re-computing the other pipe WM values, it's
-		 * because it was really needed, so we expect the WM values to
-		 * be different.
-		 */
-		WARN_ON(!wm_changed);
-
-		skl_compute_wm_results(dev, &pipe_wm, r, intel_crtc);
-		r->dirty_pipes |= drm_crtc_mask(&intel_crtc->base);
-	}
-}
-
-static void skl_clear_wm(struct skl_wm_values *watermarks, enum pipe pipe)
-{
-	watermarks->wm_linetime[pipe] = 0;
-	memset(watermarks->plane[pipe], 0,
-	       sizeof(uint32_t) * 8 * I915_MAX_PLANES);
-	memset(watermarks->plane_trans[pipe],
-	       0, sizeof(uint32_t) * I915_MAX_PLANES);
-	watermarks->plane_trans[pipe][PLANE_CURSOR] = 0;
-}
-
 static int
 skl_compute_ddb(struct drm_atomic_state *state)
 {
@@ -3783,6 +3711,7 @@ skl_compute_ddb(struct drm_atomic_state *state)
 	struct drm_i915_private *dev_priv = to_i915(dev);
 	struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
 	struct intel_crtc *intel_crtc;
+	struct skl_ddb_allocation *ddb = &intel_state->wm_results.ddb;
 	unsigned realloc_pipes = dev_priv->active_crtcs;
 	int ret;
 
@@ -3808,8 +3737,10 @@ skl_compute_ddb(struct drm_atomic_state *state)
 	 * any other display updates race with this transaction, so we need
 	 * to grab the lock on *all* CRTC's.
 	 */
-	if (intel_state->active_pipe_changes)
+	if (intel_state->active_pipe_changes) {
 		realloc_pipes = ~0;
+		intel_state->wm_results.dirty_pipes = ~0;
+	}
 
 	for_each_intel_crtc_mask(dev, intel_crtc, realloc_pipes) {
 		struct intel_crtc_state *cstate;
@@ -3818,7 +3749,7 @@ skl_compute_ddb(struct drm_atomic_state *state)
 		if (IS_ERR(cstate))
 			return PTR_ERR(cstate);
 
-		ret = skl_allocate_pipe_ddb(cstate, &intel_state->ddb);
+		ret = skl_allocate_pipe_ddb(cstate, ddb);
 		if (ret)
 			return ret;
 	}
@@ -3831,8 +3762,11 @@ skl_compute_wm(struct drm_atomic_state *state)
 {
 	struct drm_crtc *crtc;
 	struct drm_crtc_state *cstate;
-	int ret, i;
+	struct intel_atomic_state *intel_state = to_intel_atomic_state(state);
+	struct skl_wm_values *results = &intel_state->wm_results;
+	struct skl_pipe_wm *pipe_wm;
 	bool changed = false;
+	int ret, i;
 
 	/*
 	 * If this transaction isn't actually touching any CRTC's, don't
@@ -3847,10 +3781,45 @@ skl_compute_wm(struct drm_atomic_state *state)
 	if (!changed)
 		return 0;
 
+	/* Clear all dirty flags */
+	results->dirty_pipes = 0;
+
 	ret = skl_compute_ddb(state);
 	if (ret)
 		return ret;
 
+	/*
+	 * Calculate WM's for all pipes that are part of this transaction.
+	 * Note that the DDB allocation above may have added more CRTC's that
+	 * weren't otherwise being modified (and set bits in dirty_pipes) if
+	 * pipe allocations had to change.
+	 *
+	 * FIXME:  Now that we're doing this in the atomic check phase, we
+	 * should allow skl_update_pipe_wm() to return failure in cases where
+	 * no suitable watermark values can be found.
+	 */
+	for_each_crtc_in_state(state, crtc, cstate, i) {
+		struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+		struct intel_crtc_state *intel_cstate =
+			to_intel_crtc_state(cstate);
+
+		pipe_wm = &intel_cstate->wm.skl.optimal;
+		ret = skl_update_pipe_wm(cstate, &results->ddb, pipe_wm,
+					 &changed);
+		if (ret)
+			return ret;
+
+		if (changed)
+			results->dirty_pipes |= drm_crtc_mask(crtc);
+
+		if ((results->dirty_pipes & drm_crtc_mask(crtc)) == 0)
+			/* This pipe's WM's did not change */
+			continue;
+
+		intel_cstate->update_wm_pre = true;
+		skl_compute_wm_results(crtc->dev, pipe_wm, results, intel_crtc);
+	}
+
 	return 0;
 }
 
@@ -3862,26 +3831,21 @@ static void skl_update_wm(struct drm_crtc *crtc)
 	struct skl_wm_values *results = &dev_priv->wm.skl_results;
 	struct intel_crtc_state *cstate = to_intel_crtc_state(crtc->state);
 	struct skl_pipe_wm *pipe_wm = &cstate->wm.skl.optimal;
-	bool wm_changed;
-
-	/* Clear all dirty flags */
-	results->dirty_pipes = 0;
 
-	skl_clear_wm(results, intel_crtc->pipe);
-
-	skl_update_pipe_wm(crtc->state, &results->ddb, pipe_wm, &wm_changed);
-	if (!wm_changed)
+	if ((results->dirty_pipes & drm_crtc_mask(crtc)) == 0)
 		return;
 
-	skl_compute_wm_results(dev, pipe_wm, results, intel_crtc);
-	results->dirty_pipes |= drm_crtc_mask(&intel_crtc->base);
+	intel_crtc->wm.active.skl = *pipe_wm;
+
+	mutex_lock(&dev_priv->wm.wm_mutex);
 
-	skl_update_other_pipe_wm(dev, crtc, results);
 	skl_write_wm_values(dev_priv, results);
 	skl_flush_wm_values(dev_priv, results);
 
 	/* store the new configuration */
 	dev_priv->wm.skl_hw = *results;
+
+	mutex_unlock(&dev_priv->wm.wm_mutex);
 }
 
 static void ilk_compute_wm_config(struct drm_device *dev,
-- 
2.1.4

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✓ Ro.CI.BAT: success for Pre-calculate SKL-style atomic watermarks (final CI run) (rev2)

[Patchwork]

== Series Details ==

Series: Pre-calculate SKL-style atomic watermarks (final CI run) (rev2)
URL   : https://patchwork.freedesktop.org/series/7075/
State : success

== Summary ==

Series 7075v2 Pre-calculate SKL-style atomic watermarks (final CI run)
http://patchwork.freedesktop.org/api/1.0/series/7075/revisions/2/mbox

Test kms_flip:
        Subgroup basic-flip-vs-wf_vblank:
                fail       -> PASS       (ro-hsw-i7-4770r)

ro-bdw-i5-5250u  total:219  pass:181  dwarn:0   dfail:0   fail:0   skip:38 
ro-bdw-i7-5557U  total:219  pass:206  dwarn:0   dfail:0   fail:0   skip:13 
ro-bdw-i7-5600u  total:219  pass:187  dwarn:0   dfail:0   fail:0   skip:32 
ro-bsw-n3050     total:219  pass:175  dwarn:0   dfail:0   fail:2   skip:42 
ro-byt-n2820     total:218  pass:175  dwarn:0   dfail:0   fail:2   skip:41 
ro-hsw-i3-4010u  total:218  pass:193  dwarn:0   dfail:0   fail:0   skip:25 
ro-hsw-i7-4770r  total:219  pass:194  dwarn:0   dfail:0   fail:0   skip:25 
ro-ilk-i7-620lm  total:219  pass:151  dwarn:0   dfail:0   fail:1   skip:67 
ro-ilk1-i5-650   total:214  pass:151  dwarn:0   dfail:0   fail:2   skip:61 
ro-ivb-i7-3770   total:219  pass:183  dwarn:0   dfail:0   fail:0   skip:36 
ro-ivb2-i7-3770  total:219  pass:186  dwarn:0   dfail:0   fail:1   skip:32 
ro-skl-i7-6700hq total:214  pass:190  dwarn:0   dfail:0   fail:0   skip:24 
ro-snb-i7-2620M  total:219  pass:177  dwarn:0   dfail:0   fail:1   skip:41 

Results at /archive/results/CI_IGT_test/RO_Patchwork_876/

a6ac4ab drm-intel-nightly: 2016y-05m-12d-15h-37m-38s UTC integration manifest
1096cb7 drm/i915: Remove wm_config from dev_priv/intel_atomic_state
053fa3d drm/i915/gen9: Reject display updates that exceed wm limitations (v2)
73fcc6d drm/i915/gen9: Calculate watermarks during atomic 'check' (v2)
616a9e9 drm/i915/gen9: Propagate watermark calculation failures up the call chain
9941f42 drm/i915/gen9: Use a bitmask to track dirty pipe watermarks
ea3f449 drm/i915/gen9: Allow watermark calculation on in-flight atomic state (v3)
7ba9a23 drm/i915/gen9: Calculate plane WM's from state
fe3a3bf drm/i915/gen9: Drop re-allocation of DDB at atomic commit (v2)
7e4426f drm/i915/gen9: Compute DDB allocation at atomic check time (v4)
f769eb6 drm/i915: Add distrust_bios_wm flag to dev_priv (v2)
94af186 drm/i915/gen9: Allow skl_allocate_pipe_ddb() to operate on in-flight state (v3)
4499d87 drm/i915: Track whether an atomic transaction changes the active CRTC's
0e5fa43 drm/i915/gen9: Store plane minimum blocks in CRTC wm state (v2)
0979389 drm/i915/gen9: Allow calculation of data rate for in-flight state (v2)
d0b9477 drm/i915/gen9: Cache plane data rates in CRTC state
77c1d12 drm/i915: Rename s/skl_compute_pipe_wm/skl_build_pipe_wm/
d9d40b7 drm/i915: Reorganize WM structs/unions in CRTC state

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Re: ✓ Ro.CI.BAT: success for Pre-calculate SKL-style atomic watermarks (final CI run) (rev2)

[Matt Roper]

On Thu, May 12, 2016 at 10:52:11PM +0000, Patchwork wrote:
> == Series Details ==
> 
> Series: Pre-calculate SKL-style atomic watermarks (final CI run) (rev2)
> URL   : https://patchwork.freedesktop.org/series/7075/
> State : success

Maarten confirmed on IRC that his r-b stands for the updated version of
patch #15, so pushed to dinq.

CI was happy this time around, but on a previous iteration it complained
about a sporadic BYT failure that we didn't seem to have a bugzilla for
yet; I opened a new one at

  https://bugs.freedesktop.org/show_bug.cgi?id=95372


Matt

> 
> == Summary ==
> 
> Series 7075v2 Pre-calculate SKL-style atomic watermarks (final CI run)
> http://patchwork.freedesktop.org/api/1.0/series/7075/revisions/2/mbox
> 
> Test kms_flip:
>         Subgroup basic-flip-vs-wf_vblank:
>                 fail       -> PASS       (ro-hsw-i7-4770r)
> 
> ro-bdw-i5-5250u  total:219  pass:181  dwarn:0   dfail:0   fail:0   skip:38 
> ro-bdw-i7-5557U  total:219  pass:206  dwarn:0   dfail:0   fail:0   skip:13 
> ro-bdw-i7-5600u  total:219  pass:187  dwarn:0   dfail:0   fail:0   skip:32 
> ro-bsw-n3050     total:219  pass:175  dwarn:0   dfail:0   fail:2   skip:42 
> ro-byt-n2820     total:218  pass:175  dwarn:0   dfail:0   fail:2   skip:41 
> ro-hsw-i3-4010u  total:218  pass:193  dwarn:0   dfail:0   fail:0   skip:25 
> ro-hsw-i7-4770r  total:219  pass:194  dwarn:0   dfail:0   fail:0   skip:25 
> ro-ilk-i7-620lm  total:219  pass:151  dwarn:0   dfail:0   fail:1   skip:67 
> ro-ilk1-i5-650   total:214  pass:151  dwarn:0   dfail:0   fail:2   skip:61 
> ro-ivb-i7-3770   total:219  pass:183  dwarn:0   dfail:0   fail:0   skip:36 
> ro-ivb2-i7-3770  total:219  pass:186  dwarn:0   dfail:0   fail:1   skip:32 
> ro-skl-i7-6700hq total:214  pass:190  dwarn:0   dfail:0   fail:0   skip:24 
> ro-snb-i7-2620M  total:219  pass:177  dwarn:0   dfail:0   fail:1   skip:41 
> 
> Results at /archive/results/CI_IGT_test/RO_Patchwork_876/
> 
> a6ac4ab drm-intel-nightly: 2016y-05m-12d-15h-37m-38s UTC integration manifest
> 1096cb7 drm/i915: Remove wm_config from dev_priv/intel_atomic_state
> 053fa3d drm/i915/gen9: Reject display updates that exceed wm limitations (v2)
> 73fcc6d drm/i915/gen9: Calculate watermarks during atomic 'check' (v2)
> 616a9e9 drm/i915/gen9: Propagate watermark calculation failures up the call chain
> 9941f42 drm/i915/gen9: Use a bitmask to track dirty pipe watermarks
> ea3f449 drm/i915/gen9: Allow watermark calculation on in-flight atomic state (v3)
> 7ba9a23 drm/i915/gen9: Calculate plane WM's from state
> fe3a3bf drm/i915/gen9: Drop re-allocation of DDB at atomic commit (v2)
> 7e4426f drm/i915/gen9: Compute DDB allocation at atomic check time (v4)
> f769eb6 drm/i915: Add distrust_bios_wm flag to dev_priv (v2)
> 94af186 drm/i915/gen9: Allow skl_allocate_pipe_ddb() to operate on in-flight state (v3)
> 4499d87 drm/i915: Track whether an atomic transaction changes the active CRTC's
> 0e5fa43 drm/i915/gen9: Store plane minimum blocks in CRTC wm state (v2)
> 0979389 drm/i915/gen9: Allow calculation of data rate for in-flight state (v2)
> d0b9477 drm/i915/gen9: Cache plane data rates in CRTC state
> 77c1d12 drm/i915: Rename s/skl_compute_pipe_wm/skl_build_pipe_wm/
> d9d40b7 drm/i915: Reorganize WM structs/unions in CRTC state
> 

-- 
Matt Roper
Graphics Software Engineer
IoTG Platform Enabling & Development
Intel Corporation
(916) 356-2795
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