Linux v4.6.3

1 files changed, 254 insertions, 0 deletions

diff --git a/0009-drm-i915-gen9-Compute-DDB-allocation-at-atomic-check.patch b/0009-drm-i915-gen9-Compute-DDB-allocation-at-atomic-check.patch
new file mode 100644
index 000000000..53fb0cd7a
--- /dev/null
+++ b/0009-drm-i915-gen9-Compute-DDB-allocation-at-atomic-check.patch
@@ -0,0 +1,254 @@
+From 0e9cf00438e4df1d97af44d3c52cc1cacc4dd2c9 Mon Sep 17 00:00:00 2001
+From: Fedora Kernel Team <kernel-team@fedoraproject.org>
+Date: Mon, 20 Jun 2016 12:40:26 +0200
+Subject: [PATCH 09/17] drm/i915/gen9: Compute DDB allocation at atomic check
+ time (v4)
+
+Upstream: since drm-intel-next-2016-05-22
+commit 98d39494d3759f84ce50e505059bc80f54c1c47b
+
+Author:     Matt Roper <matthew.d.roper@intel.com>
+AuthorDate: Thu May 12 07:06:03 2016 -0700
+Commit:     Matt Roper <matthew.d.roper@intel.com>
+CommitDate: Fri May 13 07:34:00 2016 -0700
+
+    drm/i915/gen9: Compute DDB allocation at atomic check time (v4)
+
+    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>
+    Link: http://patchwork.freedesktop.org/patch/msgid/1463061971-19638-10-git-send-email-matthew.d.roper@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 ae7932a..237df9f 100644
+--- a/drivers/gpu/drm/i915/i915_drv.h
++++ b/drivers/gpu/drm/i915/i915_drv.h
+@@ -296,6 +296,10 @@ 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,	\
+@@ -638,6 +642,7 @@ struct drm_i915_display_funcs {
+ 	int (*compute_pipe_wm)(struct intel_crtc *crtc,
+ 			       struct drm_atomic_state *state);
+ 	void (*program_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 786f3d9..03e2635 100644
+--- a/drivers/gpu/drm/i915/intel_display.c
++++ b/drivers/gpu/drm/i915/intel_display.c
+@@ -13225,6 +13225,7 @@ 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;
+@@ -13254,6 +13255,10 @@ 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);
+ }
+ 
+ /**
+@@ -13616,6 +13621,19 @@ static int intel_atomic_commit(struct drm_device *dev,
+ 			modeset_put_power_domains(dev_priv, put_domains[i]);
+ 	}
+ 
++	/*
++	 * 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 672ca56..4d6336a 100644
+--- a/drivers/gpu/drm/i915/intel_drv.h
++++ b/drivers/gpu/drm/i915/intel_drv.h
+@@ -271,6 +271,9 @@ struct intel_atomic_state {
+ 
+ 	struct intel_shared_dpll_config shared_dpll[I915_NUM_PLLS];
+ 	struct intel_wm_config wm_config;
++
++	/* 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 6a09d7a..f60519d 100644
+--- a/drivers/gpu/drm/i915/intel_pm.c
++++ b/drivers/gpu/drm/i915/intel_pm.c
+@@ -3751,6 +3751,84 @@ 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);
+@@ -7258,6 +7336,7 @@ void intel_init_pm(struct drm_device *dev)
+ 			dev_priv->display.init_clock_gating =
+ 				bxt_init_clock_gating;
+ 		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);
+ 
+-- 
+2.7.4
+