[PATCH 0/3] Optimize use of DBuf slices

[PATCH 0/3] Optimize use of DBuf slices

[Mahesh Kumar]

Patches in this series were originally part of series:
https://patchwork.freedesktop.org/series/36993/

Reposting it here after rebase
use kernel types u8/u16 etc instead of uint8_t

Changes:
 - Rebase the series

Mahesh Kumar (3):
  drm/i915/icl: track dbuf slice-2 status
  drm/i915/icl: Enable 2nd DBuf slice only when needed
  drm/i915/icl: update ddb entry start/end mask during hw ddb readout

 drivers/gpu/drm/i915/i915_drv.h         |   1 +
 drivers/gpu/drm/i915/i915_reg.h         |   3 +
 drivers/gpu/drm/i915/intel_display.c    |  15 +++++
 drivers/gpu/drm/i915/intel_drv.h        |   6 ++
 drivers/gpu/drm/i915/intel_pm.c         | 103 ++++++++++++++++++++++++++------
 drivers/gpu/drm/i915/intel_runtime_pm.c |  69 ++++++++++++++++-----
 6 files changed, 165 insertions(+), 32 deletions(-)

-- 
2.16.2

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[PATCH 1/3] drm/i915/icl: track dbuf slice-2 status

[Mahesh Kumar]

This patch adds support to start tracking status of DBUF slices.
This is foundation to introduce support for enabling/disabling second
DBUF slice dynamically for ICL.

Changes Since V1:
 - use kernel type u8 over uint8_t

Signed-off-by: Mahesh Kumar <mahesh1.kumar@intel.com>
Reviewed-by: James Ausmus <james.ausmus@intel.com>
---
 drivers/gpu/drm/i915/i915_drv.h         |  1 +
 drivers/gpu/drm/i915/intel_display.c    |  5 +++++
 drivers/gpu/drm/i915/intel_pm.c         | 20 ++++++++++++++++++++
 drivers/gpu/drm/i915/intel_runtime_pm.c |  4 ++++
 4 files changed, 30 insertions(+)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 8444ca8d5aa3..193176bcddf5 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -1189,6 +1189,7 @@ struct skl_ddb_allocation {
 	/* packed/y */
 	struct skl_ddb_entry plane[I915_MAX_PIPES][I915_MAX_PLANES];
 	struct skl_ddb_entry uv_plane[I915_MAX_PIPES][I915_MAX_PLANES];
+	u8 enabled_slices; /* GEN11 has configurable 2 slices */
 };
 
 struct skl_ddb_values {
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 09e96d547c01..e5ad95d0af1b 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -11445,6 +11445,11 @@ static void verify_wm_state(struct drm_crtc *crtc,
 	skl_ddb_get_hw_state(dev_priv, &hw_ddb);
 	sw_ddb = &dev_priv->wm.skl_hw.ddb;
 
+	if (INTEL_GEN(dev_priv) >= 11)
+		if (hw_ddb.enabled_slices != sw_ddb->enabled_slices)
+			DRM_ERROR("mismatch in DBUF Slices (expected %u, got %u)\n",
+				  sw_ddb->enabled_slices,
+				  hw_ddb.enabled_slices);
 	/* planes */
 	for_each_universal_plane(dev_priv, pipe, plane) {
 		hw_plane_wm = &hw_wm.planes[plane];
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 4baab858e442..a29e6d512771 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3567,6 +3567,23 @@ bool ilk_disable_lp_wm(struct drm_device *dev)
 	return _ilk_disable_lp_wm(dev_priv, WM_DIRTY_LP_ALL);
 }
 
+static u8 intel_enabled_dbuf_slices_num(struct drm_i915_private *dev_priv)
+{
+	u8 enabled_slices;
+
+	/* Slice 1 will always be enabled */
+	enabled_slices = 1;
+
+	/* Gen prior to GEN11 have only one DBuf slice */
+	if (INTEL_GEN(dev_priv) < 11)
+		return enabled_slices;
+
+	if (I915_READ(DBUF_CTL_S2) & DBUF_POWER_STATE)
+		enabled_slices++;
+
+	return enabled_slices;
+}
+
 /*
  * FIXME: We still don't have the proper code detect if we need to apply the WA,
  * so assume we'll always need it in order to avoid underruns.
@@ -3870,6 +3887,8 @@ void skl_ddb_get_hw_state(struct drm_i915_private *dev_priv,
 
 	memset(ddb, 0, sizeof(*ddb));
 
+	ddb->enabled_slices = intel_enabled_dbuf_slices_num(dev_priv);
+
 	for_each_intel_crtc(&dev_priv->drm, crtc) {
 		enum intel_display_power_domain power_domain;
 		enum plane_id plane_id;
@@ -5088,6 +5107,7 @@ skl_copy_ddb_for_pipe(struct skl_ddb_values *dst,
 	       sizeof(dst->ddb.uv_plane[pipe]));
 	memcpy(dst->ddb.plane[pipe], src->ddb.plane[pipe],
 	       sizeof(dst->ddb.plane[pipe]));
+	dst->ddb.enabled_slices = src->ddb.enabled_slices;
 }
 
 static void
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index ec59992cf87a..afc6ef81ca0c 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -2656,6 +2656,8 @@ static void icl_dbuf_enable(struct drm_i915_private *dev_priv)
 	if (!(I915_READ(DBUF_CTL_S1) & DBUF_POWER_STATE) ||
 	    !(I915_READ(DBUF_CTL_S2) & DBUF_POWER_STATE))
 		DRM_ERROR("DBuf power enable timeout\n");
+	else
+		dev_priv->wm.skl_hw.ddb.enabled_slices = 2;
 }
 
 static void icl_dbuf_disable(struct drm_i915_private *dev_priv)
@@ -2669,6 +2671,8 @@ static void icl_dbuf_disable(struct drm_i915_private *dev_priv)
 	if ((I915_READ(DBUF_CTL_S1) & DBUF_POWER_STATE) ||
 	    (I915_READ(DBUF_CTL_S2) & DBUF_POWER_STATE))
 		DRM_ERROR("DBuf power disable timeout!\n");
+	else
+		dev_priv->wm.skl_hw.ddb.enabled_slices = 0;
 }
 
 static void icl_mbus_init(struct drm_i915_private *dev_priv)
-- 
2.16.2

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[PATCH 2/3] drm/i915/icl: Enable 2nd DBuf slice only when needed

[Mahesh Kumar]

ICL has two slices of DBuf, each slice of size 1024 blocks.
We should not always enable slice-2. It should be enabled only if
display total required BW is > 12GBps OR more than 1 pipes are enabled.

Changes since V1:
 - typecast total_data_rate to u64 before multiplication to solve any
   possible overflow (Rodrigo)
 - fix where skl_wm_get_hw_state was memsetting ddb, resulting
   enabled_slices to become zero
 - Fix the logic of calculating ddb_size
Changes since V2:
 - If no-crtc is part of commit required_slices will have value "0",
   don't try to disable DBuf slice.
Changes since V3:
 - Create a generic helper to enable/disable slice
 - don't return early if total_data_rate is 0, it may be cursor only
   commit, or atomic modeset without any plane.
Changes since V4:
 - Solve checkpatch warnings
 - use kernel types u8/u64 instead of uint8_t/uint64_t
Changes since V5:
 - Rebase

Signed-off-by: Mahesh Kumar <mahesh1.kumar@intel.com>
Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>
---
 drivers/gpu/drm/i915/intel_display.c    | 10 +++++
 drivers/gpu/drm/i915/intel_drv.h        |  6 +++
 drivers/gpu/drm/i915/intel_pm.c         | 57 +++++++++++++++++++++++------
 drivers/gpu/drm/i915/intel_runtime_pm.c | 65 ++++++++++++++++++++++++++-------
 4 files changed, 113 insertions(+), 25 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index e5ad95d0af1b..a61909dc90ba 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -12256,6 +12256,8 @@ static void skl_update_crtcs(struct drm_atomic_state *state)
 	bool progress;
 	enum pipe pipe;
 	int i;
+	u8 hw_enabled_slices = dev_priv->wm.skl_hw.ddb.enabled_slices;
+	u8 required_slices = intel_state->wm_results.ddb.enabled_slices;
 
 	const struct skl_ddb_entry *entries[I915_MAX_PIPES] = {};
 
@@ -12264,6 +12266,10 @@ static void skl_update_crtcs(struct drm_atomic_state *state)
 		if (new_crtc_state->active)
 			entries[i] = &to_intel_crtc_state(old_crtc_state)->wm.skl.ddb;
 
+	/* If 2nd DBuf slice required, enable it here */
+	if (INTEL_GEN(dev_priv) >= 11 && required_slices > hw_enabled_slices)
+		icl_dbuf_slices_update(dev_priv, required_slices);
+
 	/*
 	 * Whenever the number of active pipes changes, we need to make sure we
 	 * update the pipes in the right order so that their ddb allocations
@@ -12314,6 +12320,10 @@ static void skl_update_crtcs(struct drm_atomic_state *state)
 			progress = true;
 		}
 	} while (progress);
+
+	/* If 2nd DBuf slice is no more required disable it */
+	if (INTEL_GEN(dev_priv) >= 11 && required_slices < hw_enabled_slices)
+		icl_dbuf_slices_update(dev_priv, required_slices);
 }
 
 static void intel_atomic_helper_free_state(struct drm_i915_private *dev_priv)
diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
index 9bba0354ccd3..11a1932cde6e 100644
--- a/drivers/gpu/drm/i915/intel_drv.h
+++ b/drivers/gpu/drm/i915/intel_drv.h
@@ -144,6 +144,10 @@
 #define KHz(x) (1000 * (x))
 #define MHz(x) KHz(1000 * (x))
 
+#define KBps(x) (1000 * (x))
+#define MBps(x) KBps(1000 * (x))
+#define GBps(x) ((u64)1000 * MBps((x)))
+
 /*
  * Display related stuff
  */
@@ -1931,6 +1935,8 @@ bool intel_display_power_get_if_enabled(struct drm_i915_private *dev_priv,
 					enum intel_display_power_domain domain);
 void intel_display_power_put(struct drm_i915_private *dev_priv,
 			     enum intel_display_power_domain domain);
+void icl_dbuf_slices_update(struct drm_i915_private *dev_priv,
+			    u8 req_slices);
 
 static inline void
 assert_rpm_device_not_suspended(struct drm_i915_private *dev_priv)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index a29e6d512771..3e72e9eb736e 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3771,9 +3771,42 @@ bool intel_can_enable_sagv(struct drm_atomic_state *state)
 	return true;
 }
 
+static unsigned int intel_get_ddb_size(struct drm_i915_private *dev_priv,
+				       const struct intel_crtc_state *cstate,
+				       const unsigned int total_data_rate,
+				       const int num_active,
+				       struct skl_ddb_allocation *ddb)
+{
+	const struct drm_display_mode *adjusted_mode;
+	u64 total_data_bw;
+	u16 ddb_size = INTEL_INFO(dev_priv)->ddb_size;
+
+	WARN_ON(ddb_size == 0);
+
+	if (INTEL_GEN(dev_priv) < 11)
+		return ddb_size - 4; /* 4 blocks for bypass path allocation */
+
+	adjusted_mode = &cstate->base.adjusted_mode;
+	total_data_bw = (u64)total_data_rate * drm_mode_vrefresh(adjusted_mode);
+
+	/*
+	 * 12GB/s is maximum BW supported by single DBuf slice.
+	 */
+	if (total_data_bw >= GBps(12) || num_active > 1) {
+		ddb->enabled_slices = 2;
+	} else {
+		ddb->enabled_slices = 1;
+		ddb_size /= 2;
+	}
+
+	return ddb_size;
+}
+
 static void
 skl_ddb_get_pipe_allocation_limits(struct drm_device *dev,
 				   const struct intel_crtc_state *cstate,
+				   const unsigned int total_data_rate,
+				   struct skl_ddb_allocation *ddb,
 				   struct skl_ddb_entry *alloc, /* out */
 				   int *num_active /* out */)
 {
@@ -3796,11 +3829,8 @@ skl_ddb_get_pipe_allocation_limits(struct drm_device *dev,
 	else
 		*num_active = hweight32(dev_priv->active_crtcs);
 
-	ddb_size = INTEL_INFO(dev_priv)->ddb_size;
-	WARN_ON(ddb_size == 0);
-
-	if (INTEL_GEN(dev_priv) < 11)
-		ddb_size -= 4; /* 4 blocks for bypass path allocation */
+	ddb_size = intel_get_ddb_size(dev_priv, cstate, total_data_rate,
+				      *num_active, ddb);
 
 	/*
 	 * If the state doesn't change the active CRTC's, then there's
@@ -4261,7 +4291,11 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
 		return 0;
 	}
 
-	skl_ddb_get_pipe_allocation_limits(dev, cstate, alloc, &num_active);
+	total_data_rate = skl_get_total_relative_data_rate(cstate,
+							   plane_data_rate,
+							   uv_plane_data_rate);
+	skl_ddb_get_pipe_allocation_limits(dev, cstate, total_data_rate, ddb,
+					   alloc, &num_active);
 	alloc_size = skl_ddb_entry_size(alloc);
 	if (alloc_size == 0)
 		return 0;
@@ -4296,9 +4330,6 @@ 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,
-							   plane_data_rate,
-							   uv_plane_data_rate);
 	if (total_data_rate == 0)
 		return 0;
 
@@ -5492,8 +5523,12 @@ void skl_wm_get_hw_state(struct drm_device *dev)
 		/* 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));
+		/*
+		 * Easy/common case; just sanitize DDB now if everything off
+		 * Keep dbuf slice info intact
+		 */
+		memset(ddb->plane, 0, sizeof(ddb->plane));
+		memset(ddb->uv_plane, 0, sizeof(ddb->uv_plane));
 	}
 }
 
diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
index afc6ef81ca0c..3fffbfe4521d 100644
--- a/drivers/gpu/drm/i915/intel_runtime_pm.c
+++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
@@ -2619,32 +2619,69 @@ static void intel_power_domains_sync_hw(struct drm_i915_private *dev_priv)
 	mutex_unlock(&power_domains->lock);
 }
 
-static void gen9_dbuf_enable(struct drm_i915_private *dev_priv)
+static inline
+bool intel_dbuf_slice_set(struct drm_i915_private *dev_priv,
+			  i915_reg_t reg, bool enable)
 {
-	I915_WRITE(DBUF_CTL, I915_READ(DBUF_CTL) | DBUF_POWER_REQUEST);
-	POSTING_READ(DBUF_CTL);
+	u32 val, status;
 
+	val = I915_READ(reg);
+	val = enable ? (val | DBUF_POWER_REQUEST) : (val & ~DBUF_POWER_REQUEST);
+	I915_WRITE(reg, val);
+	POSTING_READ(reg);
 	udelay(10);
 
-	if (!(I915_READ(DBUF_CTL) & DBUF_POWER_STATE))
-		DRM_ERROR("DBuf power enable timeout\n");
+	status = I915_READ(reg) & DBUF_POWER_STATE;
+	if ((enable && !status) || (!enable && status)) {
+		DRM_ERROR("DBus power %s timeout!\n",
+			  enable ? "enable" : "disable");
+		return false;
+	}
+	return true;
+}
+
+static void gen9_dbuf_enable(struct drm_i915_private *dev_priv)
+{
+	intel_dbuf_slice_set(dev_priv, DBUF_CTL, true);
 }
 
 static void gen9_dbuf_disable(struct drm_i915_private *dev_priv)
 {
-	I915_WRITE(DBUF_CTL, I915_READ(DBUF_CTL) & ~DBUF_POWER_REQUEST);
-	POSTING_READ(DBUF_CTL);
+	intel_dbuf_slice_set(dev_priv, DBUF_CTL, false);
+}
 
-	udelay(10);
+static u8 intel_dbuf_max_slices(struct drm_i915_private *dev_priv)
+{
+	if (INTEL_GEN(dev_priv) < 11)
+		return 1;
+	return 2;
+}
 
-	if (I915_READ(DBUF_CTL) & DBUF_POWER_STATE)
-		DRM_ERROR("DBuf power disable timeout!\n");
+void icl_dbuf_slices_update(struct drm_i915_private *dev_priv,
+			    u8 req_slices)
+{
+	u8 hw_enabled_slices = dev_priv->wm.skl_hw.ddb.enabled_slices;
+	u32 val;
+	bool ret;
+
+	if (req_slices > intel_dbuf_max_slices(dev_priv)) {
+		DRM_ERROR("Invalid number of dbuf slices requested\n");
+		return;
+	}
+
+	if (req_slices == hw_enabled_slices || req_slices == 0)
+		return;
+
+	val = I915_READ(DBUF_CTL_S2);
+	if (req_slices > hw_enabled_slices)
+		ret = intel_dbuf_slice_set(dev_priv, DBUF_CTL_S2, true);
+	else
+		ret = intel_dbuf_slice_set(dev_priv, DBUF_CTL_S2, false);
+
+	if (ret)
+		dev_priv->wm.skl_hw.ddb.enabled_slices = req_slices;
 }
 
-/*
- * TODO: we shouldn't always enable DBUF_CTL_S2, we should only enable it when
- * needed and keep it disabled as much as possible.
- */
 static void icl_dbuf_enable(struct drm_i915_private *dev_priv)
 {
 	I915_WRITE(DBUF_CTL_S1, I915_READ(DBUF_CTL_S1) | DBUF_POWER_REQUEST);
-- 
2.16.2

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Re: [PATCH 2/3] drm/i915/icl: Enable 2nd DBuf slice only when needed

[Imre Deak]

On Thu, Apr 26, 2018 at 07:55:16PM +0530, Mahesh Kumar wrote:
> ICL has two slices of DBuf, each slice of size 1024 blocks.
> We should not always enable slice-2. It should be enabled only if
> display total required BW is > 12GBps OR more than 1 pipes are enabled.
> 
> Changes since V1:
>  - typecast total_data_rate to u64 before multiplication to solve any
>    possible overflow (Rodrigo)
>  - fix where skl_wm_get_hw_state was memsetting ddb, resulting
>    enabled_slices to become zero
>  - Fix the logic of calculating ddb_size
> Changes since V2:
>  - If no-crtc is part of commit required_slices will have value "0",
>    don't try to disable DBuf slice.
> Changes since V3:
>  - Create a generic helper to enable/disable slice
>  - don't return early if total_data_rate is 0, it may be cursor only
>    commit, or atomic modeset without any plane.
> Changes since V4:
>  - Solve checkpatch warnings
>  - use kernel types u8/u64 instead of uint8_t/uint64_t
> Changes since V5:
>  - Rebase
> 
> Signed-off-by: Mahesh Kumar <mahesh1.kumar@intel.com>
> Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

Hi, could you take a look at

https://bugs.freedesktop.org/show_bug.cgi?id=108654

?

Looks like we're calculating 
dev_priv->wm.skl_hw.ddb.enabled_slices or
intel_state->wm_results.ddb.enabled_slices

incorrectly when outputs are disabled, leading to an invalid HW access
by a set_plane IOCTL while runtime suspended.

> ---
>  drivers/gpu/drm/i915/intel_display.c    | 10 +++++
>  drivers/gpu/drm/i915/intel_drv.h        |  6 +++
>  drivers/gpu/drm/i915/intel_pm.c         | 57 +++++++++++++++++++++++------
>  drivers/gpu/drm/i915/intel_runtime_pm.c | 65 ++++++++++++++++++++++++++-------
>  4 files changed, 113 insertions(+), 25 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
> index e5ad95d0af1b..a61909dc90ba 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -12256,6 +12256,8 @@ static void skl_update_crtcs(struct drm_atomic_state *state)
>  	bool progress;
>  	enum pipe pipe;
>  	int i;
> +	u8 hw_enabled_slices = dev_priv->wm.skl_hw.ddb.enabled_slices;
> +	u8 required_slices = intel_state->wm_results.ddb.enabled_slices;
>  
>  	const struct skl_ddb_entry *entries[I915_MAX_PIPES] = {};
>  
> @@ -12264,6 +12266,10 @@ static void skl_update_crtcs(struct drm_atomic_state *state)
>  		if (new_crtc_state->active)
>  			entries[i] = &to_intel_crtc_state(old_crtc_state)->wm.skl.ddb;
>  
> +	/* If 2nd DBuf slice required, enable it here */
> +	if (INTEL_GEN(dev_priv) >= 11 && required_slices > hw_enabled_slices)
> +		icl_dbuf_slices_update(dev_priv, required_slices);
> +
>  	/*
>  	 * Whenever the number of active pipes changes, we need to make sure we
>  	 * update the pipes in the right order so that their ddb allocations
> @@ -12314,6 +12320,10 @@ static void skl_update_crtcs(struct drm_atomic_state *state)
>  			progress = true;
>  		}
>  	} while (progress);
> +
> +	/* If 2nd DBuf slice is no more required disable it */
> +	if (INTEL_GEN(dev_priv) >= 11 && required_slices < hw_enabled_slices)
> +		icl_dbuf_slices_update(dev_priv, required_slices);
>  }
>  
>  static void intel_atomic_helper_free_state(struct drm_i915_private *dev_priv)
> diff --git a/drivers/gpu/drm/i915/intel_drv.h b/drivers/gpu/drm/i915/intel_drv.h
> index 9bba0354ccd3..11a1932cde6e 100644
> --- a/drivers/gpu/drm/i915/intel_drv.h
> +++ b/drivers/gpu/drm/i915/intel_drv.h
> @@ -144,6 +144,10 @@
>  #define KHz(x) (1000 * (x))
>  #define MHz(x) KHz(1000 * (x))
>  
> +#define KBps(x) (1000 * (x))
> +#define MBps(x) KBps(1000 * (x))
> +#define GBps(x) ((u64)1000 * MBps((x)))
> +
>  /*
>   * Display related stuff
>   */
> @@ -1931,6 +1935,8 @@ bool intel_display_power_get_if_enabled(struct drm_i915_private *dev_priv,
>  					enum intel_display_power_domain domain);
>  void intel_display_power_put(struct drm_i915_private *dev_priv,
>  			     enum intel_display_power_domain domain);
> +void icl_dbuf_slices_update(struct drm_i915_private *dev_priv,
> +			    u8 req_slices);
>  
>  static inline void
>  assert_rpm_device_not_suspended(struct drm_i915_private *dev_priv)
> diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
> index a29e6d512771..3e72e9eb736e 100644
> --- a/drivers/gpu/drm/i915/intel_pm.c
> +++ b/drivers/gpu/drm/i915/intel_pm.c
> @@ -3771,9 +3771,42 @@ bool intel_can_enable_sagv(struct drm_atomic_state *state)
>  	return true;
>  }
>  
> +static unsigned int intel_get_ddb_size(struct drm_i915_private *dev_priv,
> +				       const struct intel_crtc_state *cstate,
> +				       const unsigned int total_data_rate,
> +				       const int num_active,
> +				       struct skl_ddb_allocation *ddb)
> +{
> +	const struct drm_display_mode *adjusted_mode;
> +	u64 total_data_bw;
> +	u16 ddb_size = INTEL_INFO(dev_priv)->ddb_size;
> +
> +	WARN_ON(ddb_size == 0);
> +
> +	if (INTEL_GEN(dev_priv) < 11)
> +		return ddb_size - 4; /* 4 blocks for bypass path allocation */
> +
> +	adjusted_mode = &cstate->base.adjusted_mode;
> +	total_data_bw = (u64)total_data_rate * drm_mode_vrefresh(adjusted_mode);
> +
> +	/*
> +	 * 12GB/s is maximum BW supported by single DBuf slice.
> +	 */
> +	if (total_data_bw >= GBps(12) || num_active > 1) {
> +		ddb->enabled_slices = 2;
> +	} else {
> +		ddb->enabled_slices = 1;
> +		ddb_size /= 2;
> +	}
> +
> +	return ddb_size;
> +}
> +
>  static void
>  skl_ddb_get_pipe_allocation_limits(struct drm_device *dev,
>  				   const struct intel_crtc_state *cstate,
> +				   const unsigned int total_data_rate,
> +				   struct skl_ddb_allocation *ddb,
>  				   struct skl_ddb_entry *alloc, /* out */
>  				   int *num_active /* out */)
>  {
> @@ -3796,11 +3829,8 @@ skl_ddb_get_pipe_allocation_limits(struct drm_device *dev,
>  	else
>  		*num_active = hweight32(dev_priv->active_crtcs);
>  
> -	ddb_size = INTEL_INFO(dev_priv)->ddb_size;
> -	WARN_ON(ddb_size == 0);
> -
> -	if (INTEL_GEN(dev_priv) < 11)
> -		ddb_size -= 4; /* 4 blocks for bypass path allocation */
> +	ddb_size = intel_get_ddb_size(dev_priv, cstate, total_data_rate,
> +				      *num_active, ddb);
>  
>  	/*
>  	 * If the state doesn't change the active CRTC's, then there's
> @@ -4261,7 +4291,11 @@ skl_allocate_pipe_ddb(struct intel_crtc_state *cstate,
>  		return 0;
>  	}
>  
> -	skl_ddb_get_pipe_allocation_limits(dev, cstate, alloc, &num_active);
> +	total_data_rate = skl_get_total_relative_data_rate(cstate,
> +							   plane_data_rate,
> +							   uv_plane_data_rate);
> +	skl_ddb_get_pipe_allocation_limits(dev, cstate, total_data_rate, ddb,
> +					   alloc, &num_active);
>  	alloc_size = skl_ddb_entry_size(alloc);
>  	if (alloc_size == 0)
>  		return 0;
> @@ -4296,9 +4330,6 @@ 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,
> -							   plane_data_rate,
> -							   uv_plane_data_rate);
>  	if (total_data_rate == 0)
>  		return 0;
>  
> @@ -5492,8 +5523,12 @@ void skl_wm_get_hw_state(struct drm_device *dev)
>  		/* 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));
> +		/*
> +		 * Easy/common case; just sanitize DDB now if everything off
> +		 * Keep dbuf slice info intact
> +		 */
> +		memset(ddb->plane, 0, sizeof(ddb->plane));
> +		memset(ddb->uv_plane, 0, sizeof(ddb->uv_plane));
>  	}
>  }
>  
> diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c b/drivers/gpu/drm/i915/intel_runtime_pm.c
> index afc6ef81ca0c..3fffbfe4521d 100644
> --- a/drivers/gpu/drm/i915/intel_runtime_pm.c
> +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
> @@ -2619,32 +2619,69 @@ static void intel_power_domains_sync_hw(struct drm_i915_private *dev_priv)
>  	mutex_unlock(&power_domains->lock);
>  }
>  
> -static void gen9_dbuf_enable(struct drm_i915_private *dev_priv)
> +static inline
> +bool intel_dbuf_slice_set(struct drm_i915_private *dev_priv,
> +			  i915_reg_t reg, bool enable)
>  {
> -	I915_WRITE(DBUF_CTL, I915_READ(DBUF_CTL) | DBUF_POWER_REQUEST);
> -	POSTING_READ(DBUF_CTL);
> +	u32 val, status;
>  
> +	val = I915_READ(reg);
> +	val = enable ? (val | DBUF_POWER_REQUEST) : (val & ~DBUF_POWER_REQUEST);
> +	I915_WRITE(reg, val);
> +	POSTING_READ(reg);
>  	udelay(10);
>  
> -	if (!(I915_READ(DBUF_CTL) & DBUF_POWER_STATE))
> -		DRM_ERROR("DBuf power enable timeout\n");
> +	status = I915_READ(reg) & DBUF_POWER_STATE;
> +	if ((enable && !status) || (!enable && status)) {
> +		DRM_ERROR("DBus power %s timeout!\n",
> +			  enable ? "enable" : "disable");
> +		return false;
> +	}
> +	return true;
> +}
> +
> +static void gen9_dbuf_enable(struct drm_i915_private *dev_priv)
> +{
> +	intel_dbuf_slice_set(dev_priv, DBUF_CTL, true);
>  }
>  
>  static void gen9_dbuf_disable(struct drm_i915_private *dev_priv)
>  {
> -	I915_WRITE(DBUF_CTL, I915_READ(DBUF_CTL) & ~DBUF_POWER_REQUEST);
> -	POSTING_READ(DBUF_CTL);
> +	intel_dbuf_slice_set(dev_priv, DBUF_CTL, false);
> +}
>  
> -	udelay(10);
> +static u8 intel_dbuf_max_slices(struct drm_i915_private *dev_priv)
> +{
> +	if (INTEL_GEN(dev_priv) < 11)
> +		return 1;
> +	return 2;
> +}
>  
> -	if (I915_READ(DBUF_CTL) & DBUF_POWER_STATE)
> -		DRM_ERROR("DBuf power disable timeout!\n");
> +void icl_dbuf_slices_update(struct drm_i915_private *dev_priv,
> +			    u8 req_slices)
> +{
> +	u8 hw_enabled_slices = dev_priv->wm.skl_hw.ddb.enabled_slices;
> +	u32 val;
> +	bool ret;
> +
> +	if (req_slices > intel_dbuf_max_slices(dev_priv)) {
> +		DRM_ERROR("Invalid number of dbuf slices requested\n");
> +		return;
> +	}
> +
> +	if (req_slices == hw_enabled_slices || req_slices == 0)
> +		return;
> +
> +	val = I915_READ(DBUF_CTL_S2);
> +	if (req_slices > hw_enabled_slices)
> +		ret = intel_dbuf_slice_set(dev_priv, DBUF_CTL_S2, true);
> +	else
> +		ret = intel_dbuf_slice_set(dev_priv, DBUF_CTL_S2, false);
> +
> +	if (ret)
> +		dev_priv->wm.skl_hw.ddb.enabled_slices = req_slices;
>  }
>  
> -/*
> - * TODO: we shouldn't always enable DBUF_CTL_S2, we should only enable it when
> - * needed and keep it disabled as much as possible.
> - */
>  static void icl_dbuf_enable(struct drm_i915_private *dev_priv)
>  {
>  	I915_WRITE(DBUF_CTL_S1, I915_READ(DBUF_CTL_S1) | DBUF_POWER_REQUEST);
> -- 
> 2.16.2
> 
> _______________________________________________
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> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
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[PATCH 3/3] drm/i915/icl: update ddb entry start/end mask during hw ddb readout

[Mahesh Kumar]

Gen11/ICL onward ddb entry start/end mask is increased from 10 bits to
11 bits. This patch make changes to use proper mask for ICL+ during
hardware ddb value readout.

Changes since V1:
 - Use _MASK & _SHIFT macro (James)
Changes since V2:
 - use kernel type u8 instead of uint8_t
Changes since V3:
 - Rebase

Signed-off-by: Mahesh Kumar <mahesh1.kumar@intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h |  3 +++
 drivers/gpu/drm/i915/intel_pm.c | 26 +++++++++++++++++++-------
 2 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 2dad655a710c..b94fa933530e 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -6481,6 +6481,9 @@ enum {
 
 #define _PLANE_BUF_CFG_1_B			0x7127c
 #define _PLANE_BUF_CFG_2_B			0x7137c
+#define  SKL_DDB_ENTRY_MASK			0x3FF
+#define  ICL_DDB_ENTRY_MASK			0x7FF
+#define  DDB_ENTRY_END_SHIFT			16
 #define _PLANE_BUF_CFG_1(pipe)	\
 	_PIPE(pipe, _PLANE_BUF_CFG_1_A, _PLANE_BUF_CFG_1_B)
 #define _PLANE_BUF_CFG_2(pipe)	\
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index 3e72e9eb736e..4126132eb707 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3864,10 +3864,18 @@ static unsigned int skl_cursor_allocation(int num_active)
 	return 8;
 }
 
-static void skl_ddb_entry_init_from_hw(struct skl_ddb_entry *entry, u32 reg)
+static void skl_ddb_entry_init_from_hw(struct drm_i915_private *dev_priv,
+				       struct skl_ddb_entry *entry, u32 reg)
 {
-	entry->start = reg & 0x3ff;
-	entry->end = (reg >> 16) & 0x3ff;
+	u16 mask;
+
+	if (INTEL_GEN(dev_priv) >= 11)
+		mask = ICL_DDB_ENTRY_MASK;
+	else
+		mask = SKL_DDB_ENTRY_MASK;
+	entry->start = reg & mask;
+	entry->end = (reg >> DDB_ENTRY_END_SHIFT) & mask;
+
 	if (entry->end)
 		entry->end += 1;
 }
@@ -3884,7 +3892,8 @@ skl_ddb_get_hw_plane_state(struct drm_i915_private *dev_priv,
 	/* Cursor doesn't support NV12/planar, so no extra calculation needed */
 	if (plane_id == PLANE_CURSOR) {
 		val = I915_READ(CUR_BUF_CFG(pipe));
-		skl_ddb_entry_init_from_hw(&ddb->plane[pipe][plane_id], val);
+		skl_ddb_entry_init_from_hw(dev_priv,
+					   &ddb->plane[pipe][plane_id], val);
 		return;
 	}
 
@@ -3903,10 +3912,13 @@ skl_ddb_get_hw_plane_state(struct drm_i915_private *dev_priv,
 	val2 = I915_READ(PLANE_NV12_BUF_CFG(pipe, plane_id));
 
 	if (fourcc == DRM_FORMAT_NV12) {
-		skl_ddb_entry_init_from_hw(&ddb->plane[pipe][plane_id], val2);
-		skl_ddb_entry_init_from_hw(&ddb->uv_plane[pipe][plane_id], val);
+		skl_ddb_entry_init_from_hw(dev_priv,
+					   &ddb->plane[pipe][plane_id], val2);
+		skl_ddb_entry_init_from_hw(dev_priv,
+					   &ddb->uv_plane[pipe][plane_id], val);
 	} else {
-		skl_ddb_entry_init_from_hw(&ddb->plane[pipe][plane_id], val);
+		skl_ddb_entry_init_from_hw(dev_priv,
+					   &ddb->plane[pipe][plane_id], val);
 	}
 }
 
-- 
2.16.2

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✗ Fi.CI.SPARSE: warning for Optimize use of DBuf slices (rev3)

[Patchwork]

== Series Details ==

Series: Optimize use of DBuf slices (rev3)
URL   : https://patchwork.freedesktop.org/series/41180/
State : warning

== Summary ==

$ dim sparse origin/drm-tip
Commit: drm/i915/icl: track dbuf slice-2 status
-drivers/gpu/drm/i915/selftests/../i915_drv.h:2211:33: warning: constant 0xffffea0000000000 is so big it is unsigned long
-drivers/gpu/drm/i915/selftests/../i915_drv.h:3659:16: warning: expression using sizeof(void)
+drivers/gpu/drm/i915/selftests/../i915_drv.h:2212:33: warning: constant 0xffffea0000000000 is so big it is unsigned long
+drivers/gpu/drm/i915/selftests/../i915_drv.h:3660:16: warning: expression using sizeof(void)

Commit: drm/i915/icl: Enable 2nd DBuf slice only when needed
Okay!

Commit: drm/i915/icl: update ddb entry start/end mask during hw ddb readout
Okay!

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✓ Fi.CI.BAT: success for Optimize use of DBuf slices (rev3)

[Patchwork]

== Series Details ==

Series: Optimize use of DBuf slices (rev3)
URL   : https://patchwork.freedesktop.org/series/41180/
State : success

== Summary ==

= CI Bug Log - changes from CI_DRM_4106 -> Patchwork_8815 =

== Summary - SUCCESS ==

  No regressions found.

  External URL: https://patchwork.freedesktop.org/api/1.0/series/41180/revisions/3/mbox/

== Known issues ==

  Here are the changes found in Patchwork_8815 that come from known issues:

  === IGT changes ===

    ==== Issues hit ====

    igt@kms_flip@basic-flip-vs-wf_vblank:
      fi-cfl-s3:          PASS -> FAIL (fdo#100368)

    
    ==== Possible fixes ====

    igt@prime_vgem@basic-fence-flip:
      fi-ilk-650:         FAIL (fdo#104008) -> PASS

    
  fdo#100368 https://bugs.freedesktop.org/show_bug.cgi?id=100368
  fdo#104008 https://bugs.freedesktop.org/show_bug.cgi?id=104008


== Participating hosts (39 -> 35) ==

  Missing    (4): fi-byt-j1900 fi-ctg-p8600 fi-ilk-m540 fi-skl-6700hq 


== Build changes ==

    * Linux: CI_DRM_4106 -> Patchwork_8815

  CI_DRM_4106: dd4a65248ce636039848b97f0b8e4704aa2f32b2 @ git://anongit.freedesktop.org/gfx-ci/linux
  IGT_4450: 0350f0e7f6a0e07281445fc3082aa70419f4aac7 @ git://anongit.freedesktop.org/xorg/app/intel-gpu-tools
  Patchwork_8815: 5c516df104b953f7868147d104cdfa4b4596dacd @ git://anongit.freedesktop.org/gfx-ci/linux
  piglit_4450: b57600ba58ae0cdbad86826fd653aa0191212f27 @ git://anongit.freedesktop.org/piglit


== Linux commits ==

5c516df104b9 drm/i915/icl: update ddb entry start/end mask during hw ddb readout
4d96ef7a65c8 drm/i915/icl: Enable 2nd DBuf slice only when needed
2e0eb86b46f1 drm/i915/icl: track dbuf slice-2 status

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_8815/issues.html
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✓ Fi.CI.IGT: success for Optimize use of DBuf slices (rev3)

[Patchwork]

== Series Details ==

Series: Optimize use of DBuf slices (rev3)
URL   : https://patchwork.freedesktop.org/series/41180/
State : success

== Summary ==

= CI Bug Log - changes from CI_DRM_4106_full -> Patchwork_8815_full =

== Summary - WARNING ==

  Minor unknown changes coming with Patchwork_8815_full need to be verified
  manually.
  
  If you think the reported changes have nothing to do with the changes
  introduced in Patchwork_8815_full, please notify your bug team to allow them
  to document this new failure mode, which will reduce false positives in CI.

  External URL: https://patchwork.freedesktop.org/api/1.0/series/41180/revisions/3/mbox/

== Possible new issues ==

  Here are the unknown changes that may have been introduced in Patchwork_8815_full:

  === IGT changes ===

    ==== Warnings ====

    igt@gem_mocs_settings@mocs-rc6-vebox:
      shard-kbl:          SKIP -> PASS +1

    igt@kms_fbcon_fbt@fbc-suspend:
      shard-snb:          PASS -> SKIP

    
== Known issues ==

  Here are the changes found in Patchwork_8815_full that come from known issues:

  === IGT changes ===

    ==== Issues hit ====

    igt@gem_render_copy_redux@normal:
      shard-kbl:          PASS -> INCOMPLETE (fdo#103665)

    igt@kms_atomic_transition@1x-modeset-transitions-nonblocking-fencing:
      shard-apl:          PASS -> FAIL (fdo#103207)

    igt@kms_cursor_legacy@cursor-vs-flip-toggle:
      shard-hsw:          PASS -> FAIL (fdo#103355)

    igt@kms_flip@absolute-wf_vblank-interruptible:
      shard-glk:          PASS -> FAIL (fdo#106087)

    igt@kms_flip@plain-flip-fb-recreate-interruptible:
      shard-glk:          PASS -> FAIL (fdo#100368)

    
    ==== Possible fixes ====

    igt@gem_eio@in-flight-contexts-1us:
      shard-glk:          FAIL (fdo#105957) -> PASS

    igt@gem_ppgtt@blt-vs-render-ctxn:
      shard-kbl:          INCOMPLETE (fdo#106023, fdo#103665) -> PASS

    igt@kms_flip@plain-flip-ts-check-interruptible:
      shard-glk:          FAIL (fdo#100368) -> PASS

    igt@kms_frontbuffer_tracking@fbc-rgb565-draw-pwrite:
      shard-glk:          DMESG-WARN -> PASS

    igt@kms_rotation_crc@primary-rotation-180:
      shard-hsw:          FAIL (fdo#103925) -> PASS

    igt@kms_vblank@pipe-a-accuracy-idle:
      shard-hsw:          FAIL (fdo#102583) -> PASS

    
  fdo#100368 https://bugs.freedesktop.org/show_bug.cgi?id=100368
  fdo#102583 https://bugs.freedesktop.org/show_bug.cgi?id=102583
  fdo#103207 https://bugs.freedesktop.org/show_bug.cgi?id=103207
  fdo#103355 https://bugs.freedesktop.org/show_bug.cgi?id=103355
  fdo#103665 https://bugs.freedesktop.org/show_bug.cgi?id=103665
  fdo#103925 https://bugs.freedesktop.org/show_bug.cgi?id=103925
  fdo#105957 https://bugs.freedesktop.org/show_bug.cgi?id=105957
  fdo#106023 https://bugs.freedesktop.org/show_bug.cgi?id=106023
  fdo#106087 https://bugs.freedesktop.org/show_bug.cgi?id=106087


== Participating hosts (6 -> 5) ==

  Missing    (1): shard-glkb 


== Build changes ==

    * Linux: CI_DRM_4106 -> Patchwork_8815

  CI_DRM_4106: dd4a65248ce636039848b97f0b8e4704aa2f32b2 @ git://anongit.freedesktop.org/gfx-ci/linux
  IGT_4450: 0350f0e7f6a0e07281445fc3082aa70419f4aac7 @ git://anongit.freedesktop.org/xorg/app/intel-gpu-tools
  Patchwork_8815: 5c516df104b953f7868147d104cdfa4b4596dacd @ git://anongit.freedesktop.org/gfx-ci/linux
  piglit_4450: b57600ba58ae0cdbad86826fd653aa0191212f27 @ git://anongit.freedesktop.org/piglit

== Logs ==

For more details see: https://intel-gfx-ci.01.org/tree/drm-tip/Patchwork_8815/shards.html
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Re: [PATCH 0/3] Optimize use of DBuf slices

[Rodrigo Vivi]

On Thu, Apr 26, 2018 at 07:55:14PM +0530, Mahesh Kumar wrote:
> Patches in this series were originally part of series:
> https://patchwork.freedesktop.org/series/36993/
> 
> Reposting it here after rebase
> use kernel types u8/u16 etc instead of uint8_t
> 
> Changes:
>  - Rebase the series

pushed to dinq, thanks.

> 
> Mahesh Kumar (3):
>   drm/i915/icl: track dbuf slice-2 status
>   drm/i915/icl: Enable 2nd DBuf slice only when needed
>   drm/i915/icl: update ddb entry start/end mask during hw ddb readout
> 
>  drivers/gpu/drm/i915/i915_drv.h         |   1 +
>  drivers/gpu/drm/i915/i915_reg.h         |   3 +
>  drivers/gpu/drm/i915/intel_display.c    |  15 +++++
>  drivers/gpu/drm/i915/intel_drv.h        |   6 ++
>  drivers/gpu/drm/i915/intel_pm.c         | 103 ++++++++++++++++++++++++++------
>  drivers/gpu/drm/i915/intel_runtime_pm.c |  69 ++++++++++++++++-----
>  6 files changed, 165 insertions(+), 32 deletions(-)
> 
> -- 
> 2.16.2
> 
> _______________________________________________
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> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
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[PATCH 0/3] Optimize use of DBuf slices

[Mahesh Kumar]

Patches in this series were originally part of series:
https://patchwork.freedesktop.org/series/36993/

Reposting it here after rebase
use kernel types u8/u16 etc instead of uint8_t

Mahesh Kumar (3):
  drm/i915/icl: track dbuf slice-2 status
  drm/i915/icl: Enable 2nd DBuf slice only when needed
  drm/i915/icl: update ddb entry start/end mask during hw ddb readout

 drivers/gpu/drm/i915/i915_drv.h         |  1 +
 drivers/gpu/drm/i915/i915_reg.h         |  3 ++
 drivers/gpu/drm/i915/intel_display.c    | 15 ++++++
 drivers/gpu/drm/i915/intel_drv.h        |  6 +++
 drivers/gpu/drm/i915/intel_pm.c         | 95 +++++++++++++++++++++++++++------
 drivers/gpu/drm/i915/intel_runtime_pm.c | 69 +++++++++++++++++++-----
 6 files changed, 160 insertions(+), 29 deletions(-)

-- 
2.16.2

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[PATCH 0/3] Optimize use of DBuf slices

[Mahesh Kumar]

Patches in this series were originally part of series:
https://patchwork.freedesktop.org/series/36993/

Reposting it here after rebase

Mahesh Kumar (3):
  drm/i915/icl: track dbuf slice-2 status
  drm/i915/icl: Enable 2nd DBuf slice only when needed
  drm/i915/icl: update ddb entry start/end mask during hw ddb readout

 drivers/gpu/drm/i915/i915_drv.h         |  1 +
 drivers/gpu/drm/i915/i915_reg.h         |  3 ++
 drivers/gpu/drm/i915/intel_display.c    | 15 ++++++
 drivers/gpu/drm/i915/intel_drv.h        |  6 +++
 drivers/gpu/drm/i915/intel_pm.c         | 95 +++++++++++++++++++++++++++------
 drivers/gpu/drm/i915/intel_runtime_pm.c | 69 +++++++++++++++++++-----
 6 files changed, 160 insertions(+), 29 deletions(-)

-- 
2.16.2

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