[Intel-gfx] [PATCH 16/20] drm/i915/fbc: Nuke state_cache
Ville Syrjala
ville.syrjala at linux.intel.com
Wed Nov 24 11:36:48 UTC 2021
From: Ville Syrjälä <ville.syrjala at linux.intel.com>
fbc->state_cache has now become useless. We can simply update
the reg params directly from the plane/crtc states during
__intel_fbc_enable().
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
drivers/gpu/drm/i915/display/intel_fbc.c | 169 +++++++++--------------
1 file changed, 62 insertions(+), 107 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_fbc.c b/drivers/gpu/drm/i915/display/intel_fbc.c
index 74ba54d70e57..7d128a49e8e1 100644
--- a/drivers/gpu/drm/i915/display/intel_fbc.c
+++ b/drivers/gpu/drm/i915/display/intel_fbc.c
@@ -60,7 +60,6 @@ struct intel_fbc_funcs {
};
struct intel_fbc_state {
- const char *no_fbc_reason;
enum i9xx_plane_id i9xx_plane;
unsigned int cfb_stride;
unsigned int cfb_size;
@@ -98,13 +97,6 @@ struct intel_fbc {
bool underrun_detected;
struct work_struct underrun_work;
- /*
- * Due to the atomic rules we can't access some structures without the
- * appropriate locking, so we cache information here in order to avoid
- * these problems.
- */
- struct intel_fbc_state state_cache;
-
/*
* This structure contains everything that's relevant to program the
* hardware registers. When we want to figure out if we need to disable
@@ -673,6 +665,8 @@ static void intel_fbc_activate(struct intel_fbc *fbc)
{
intel_fbc_hw_activate(fbc);
intel_fbc_nuke(fbc);
+
+ fbc->no_fbc_reason = NULL;
}
static void intel_fbc_deactivate(struct intel_fbc *fbc, const char *reason)
@@ -714,9 +708,7 @@ static u64 intel_fbc_stolen_end(struct drm_i915_private *i915)
static int intel_fbc_min_limit(const struct intel_plane_state *plane_state)
{
- int fb_cpp = plane_state->hw.fb ? plane_state->hw.fb->format->cpp[0] : 0;
-
- return fb_cpp == 2 ? 2 : 1;
+ return plane_state->hw.fb->format->cpp[0] == 2 ? 2 : 1;
}
static int intel_fbc_max_limit(struct drm_i915_private *i915)
@@ -962,10 +954,9 @@ static void intel_fbc_update_state_cache(struct intel_atomic_state *state,
const struct intel_plane_state *plane_state =
intel_atomic_get_new_plane_state(state, plane);
struct intel_fbc *fbc = plane->fbc;
- struct intel_fbc_state *cache = &fbc->state_cache;
+ struct intel_fbc_state *cache = &fbc->params;
- cache->no_fbc_reason = plane_state->no_fbc_reason;
- if (cache->no_fbc_reason)
+ if (plane_state->no_fbc_reason)
return;
cache->i9xx_plane = plane->i9xx_plane;
@@ -989,9 +980,46 @@ static void intel_fbc_update_state_cache(struct intel_atomic_state *state,
cache->override_cfb_stride = intel_fbc_override_cfb_stride(plane_state);
}
-static bool intel_fbc_cfb_size_changed(struct intel_fbc *fbc)
+static bool intel_fbc_is_fence_ok(const struct intel_plane_state *plane_state)
{
- return fbc->state_cache.cfb_size > fbc->compressed_fb.size * fbc->limit;
+ struct drm_i915_private *i915 = to_i915(plane_state->uapi.plane->dev);
+
+ /* The use of a CPU fence is one of two ways to detect writes by the
+ * CPU to the scanout and trigger updates to the FBC.
+ *
+ * The other method is by software tracking (see
+ * intel_fbc_invalidate/flush()), it will manually notify FBC and nuke
+ * the current compressed buffer and recompress it.
+ *
+ * Note that is possible for a tiled surface to be unmappable (and
+ * so have no fence associated with it) due to aperture constraints
+ * at the time of pinning.
+ *
+ * FIXME with 90/270 degree rotation we should use the fence on
+ * the normal GTT view (the rotated view doesn't even have a
+ * fence). Would need changes to the FBC fence Y offset as well.
+ * For now this will effectively disable FBC with 90/270 degree
+ * rotation.
+ */
+ return DISPLAY_VER(i915) >= 9 ||
+ (plane_state->flags & PLANE_HAS_FENCE &&
+ plane_state->ggtt_vma->fence);
+}
+
+static bool intel_fbc_is_cfb_ok(const struct intel_plane_state *plane_state)
+{
+ struct intel_plane *plane = to_intel_plane(plane_state->uapi.plane);
+ struct intel_fbc *fbc = plane->fbc;
+
+ return intel_fbc_min_limit(plane_state) <= fbc->limit &&
+ intel_fbc_cfb_size(plane_state) <= fbc->compressed_fb.size * fbc->limit;
+}
+
+static bool intel_fbc_is_ok(const struct intel_plane_state *plane_state)
+{
+ return !plane_state->no_fbc_reason &&
+ intel_fbc_is_fence_ok(plane_state) &&
+ intel_fbc_is_cfb_ok(plane_state);
}
static int intel_fbc_check_plane(struct intel_atomic_state *state,
@@ -1108,74 +1136,11 @@ static int intel_fbc_check_plane(struct intel_atomic_state *state,
return 0;
}
-static bool intel_fbc_can_activate(struct intel_fbc *fbc)
-{
- struct drm_i915_private *i915 = fbc->i915;
- struct intel_fbc_state *cache = &fbc->state_cache;
-
- if (cache->no_fbc_reason) {
- fbc->no_fbc_reason = cache->no_fbc_reason;
- return false;
- }
-
- /* The use of a CPU fence is one of two ways to detect writes by the
- * CPU to the scanout and trigger updates to the FBC.
- *
- * The other method is by software tracking (see
- * intel_fbc_invalidate/flush()), it will manually notify FBC and nuke
- * the current compressed buffer and recompress it.
- *
- * Note that is possible for a tiled surface to be unmappable (and
- * so have no fence associated with it) due to aperture constraints
- * at the time of pinning.
- *
- * FIXME with 90/270 degree rotation we should use the fence on
- * the normal GTT view (the rotated view doesn't even have a
- * fence). Would need changes to the FBC fence Y offset as well.
- * For now this will effectively disable FBC with 90/270 degree
- * rotation.
- */
- if (DISPLAY_VER(i915) < 9 && cache->fence_id < 0) {
- fbc->no_fbc_reason = "framebuffer not tiled or fenced";
- return false;
- }
-
- /*
- * It is possible for the required CFB size change without a
- * crtc->disable + crtc->enable since it is possible to change the
- * stride without triggering a full modeset. Since we try to
- * over-allocate the CFB, there's a chance we may keep FBC enabled even
- * if this happens, but if we exceed the current CFB size we'll have to
- * disable FBC. Notice that it would be possible to disable FBC, wait
- * for a frame, free the stolen node, then try to reenable FBC in case
- * we didn't get any invalidate/deactivate calls, but this would require
- * a lot of tracking just for a specific case. If we conclude it's an
- * important case, we can implement it later.
- */
- if (intel_fbc_cfb_size_changed(fbc)) {
- fbc->no_fbc_reason = "CFB requirements changed";
- return false;
- }
-
- return true;
-}
-
-static void intel_fbc_get_reg_params(struct intel_fbc *fbc)
-{
- const struct intel_fbc_state *cache = &fbc->state_cache;
- struct intel_fbc_state *params = &fbc->params;
-
- /* Since all our fields are integer types, use memset here so the
- * comparison function can rely on memcmp because the padding will be
- * zero. */
- *params = *cache;
-}
static bool intel_fbc_can_flip_nuke(struct intel_atomic_state *state,
struct intel_crtc *crtc,
struct intel_plane *plane)
{
- struct intel_fbc *fbc = plane->fbc;
const struct intel_crtc_state *new_crtc_state =
intel_atomic_get_new_crtc_state(state, crtc);
const struct intel_plane_state *old_plane_state =
@@ -1184,16 +1149,12 @@ static bool intel_fbc_can_flip_nuke(struct intel_atomic_state *state,
intel_atomic_get_new_plane_state(state, plane);
const struct drm_framebuffer *old_fb = old_plane_state->hw.fb;
const struct drm_framebuffer *new_fb = new_plane_state->hw.fb;
- const struct intel_fbc_state *cache = &fbc->state_cache;
- const struct intel_fbc_state *params = &fbc->params;
if (drm_atomic_crtc_needs_modeset(&new_crtc_state->uapi))
return false;
- if (!intel_fbc_can_activate(fbc))
- return false;
-
- if (!old_fb || !new_fb)
+ if (!intel_fbc_is_ok(old_plane_state) ||
+ !intel_fbc_is_ok(new_plane_state))
return false;
if (old_fb->format->format != new_fb->format->format)
@@ -1206,13 +1167,16 @@ static bool intel_fbc_can_flip_nuke(struct intel_atomic_state *state,
intel_fbc_plane_stride(new_plane_state))
return false;
- if (params->cfb_stride != cache->cfb_stride)
+ if (intel_fbc_cfb_stride(old_plane_state) !=
+ intel_fbc_cfb_stride(new_plane_state))
return false;
- if (params->cfb_size != cache->cfb_size)
+ if (intel_fbc_cfb_size(old_plane_state) !=
+ intel_fbc_cfb_size(new_plane_state))
return false;
- if (params->override_cfb_stride != cache->override_cfb_stride)
+ if (intel_fbc_override_cfb_stride(old_plane_state) !=
+ intel_fbc_override_cfb_stride(new_plane_state))
return false;
return true;
@@ -1226,7 +1190,6 @@ static bool __intel_fbc_pre_update(struct intel_atomic_state *state,
struct intel_fbc *fbc = plane->fbc;
bool need_vblank_wait = false;
- intel_fbc_update_state_cache(state, crtc, plane);
fbc->flip_pending = true;
if (intel_fbc_can_flip_nuke(state, crtc, plane))
@@ -1302,16 +1265,6 @@ static void __intel_fbc_post_update(struct intel_fbc *fbc)
drm_WARN_ON(&i915->drm, !mutex_is_locked(&fbc->lock));
- if (!i915->params.enable_fbc) {
- intel_fbc_deactivate(fbc, "disabled at runtime per module param");
- __intel_fbc_disable(fbc);
-
- return;
- }
-
- if (!intel_fbc_can_activate(fbc))
- return;
-
if (!fbc->busy_bits)
intel_fbc_activate(fbc);
else
@@ -1335,7 +1288,6 @@ void intel_fbc_post_update(struct intel_atomic_state *state,
if (fbc->plane == plane) {
fbc->flip_pending = false;
- intel_fbc_get_reg_params(fbc);
__intel_fbc_post_update(fbc);
}
@@ -1425,15 +1377,12 @@ static void __intel_fbc_enable(struct intel_atomic_state *state,
const struct intel_plane_state *plane_state =
intel_atomic_get_new_plane_state(state, plane);
struct intel_fbc *fbc = plane->fbc;
- struct intel_fbc_state *cache = &fbc->state_cache;
- int min_limit = intel_fbc_min_limit(plane_state);
if (fbc->plane) {
if (fbc->plane != plane)
return;
- if (fbc->limit >= min_limit &&
- !intel_fbc_cfb_size_changed(fbc))
+ if (intel_fbc_is_ok(plane_state))
return;
__intel_fbc_disable(fbc);
@@ -1441,17 +1390,22 @@ static void __intel_fbc_enable(struct intel_atomic_state *state,
drm_WARN_ON(&i915->drm, fbc->active);
- intel_fbc_update_state_cache(state, crtc, plane);
+ fbc->no_fbc_reason = plane_state->no_fbc_reason;
+ if (fbc->no_fbc_reason)
+ return;
- if (cache->no_fbc_reason)
+ if (!intel_fbc_is_fence_ok(plane_state)) {
+ fbc->no_fbc_reason = "framebuffer not fenced";
return;
+ }
if (fbc->underrun_detected) {
fbc->no_fbc_reason = "FIFO underrun";
return;
}
- if (intel_fbc_alloc_cfb(fbc, intel_fbc_cfb_size(plane_state), min_limit)) {
+ if (intel_fbc_alloc_cfb(fbc, intel_fbc_cfb_size(plane_state),
+ intel_fbc_min_limit(plane_state))) {
fbc->no_fbc_reason = "not enough stolen memory";
return;
}
@@ -1460,6 +1414,7 @@ static void __intel_fbc_enable(struct intel_atomic_state *state,
plane->base.base.id, plane->base.name);
fbc->no_fbc_reason = "FBC enabled but not active yet\n";
+ intel_fbc_update_state_cache(state, crtc, plane);
fbc->plane = plane;
intel_fbc_program_cfb(fbc);
--
2.32.0
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