[Intel-gfx] [PATCH] drm/i915/gen9: Re-allocate DDB only for changed pipes
Matt Roper
matthew.d.roper at intel.com
Mon Jun 27 23:42:44 UTC 2016
When a display update triggers a DDB re-allocation, we should start by
assuming that only the updated pipes need to be re-allocated (we have
logic later that may add additional pipes if, e.g., a modeset triggers a
change to the global allocation).
We were erroneously using the _active_ pipes as our starting point
rather than the changed pipes. This causes us to grab CRTC locks that
we didn't actually need, reducing parallelism. Given the recent
non-blocking atomic changes, it also causes legacy pageflips against one
CRTC to return -EBUSY if there's an outstanding pageflip against a
different CRTC (a situation easily triggered via compositors like
Weston).
Fixes: 98d39494d3 ("drm/i915/gen9: Compute DDB allocation at atomic check time (v4)")
Cc: Maarten Lankhorst <maarten.lankhorst at linux.intel.com>
Signed-off-by: Matt Roper <matthew.d.roper at intel.com>
---
drivers/gpu/drm/i915/intel_pm.c | 15 ++++++++++++++-
1 file changed, 14 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/intel_pm.c b/drivers/gpu/drm/i915/intel_pm.c
index c94521cc..d7f8ba8 100644
--- a/drivers/gpu/drm/i915/intel_pm.c
+++ b/drivers/gpu/drm/i915/intel_pm.c
@@ -3879,6 +3879,19 @@ static int skl_update_pipe_wm(struct drm_crtc_state *cstate,
return 0;
}
+static uint32_t
+pipes_modified(struct drm_atomic_state *state)
+{
+ struct drm_crtc *crtc;
+ struct drm_crtc_state *cstate;
+ uint32_t i, ret = 0;
+
+ for_each_crtc_in_state(state, crtc, cstate, i)
+ ret |= drm_crtc_mask(crtc);
+
+ return ret;
+}
+
static int
skl_compute_ddb(struct drm_atomic_state *state)
{
@@ -3887,7 +3900,7 @@ skl_compute_ddb(struct drm_atomic_state *state)
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;
+ uint32_t realloc_pipes = pipes_modified(state);
int ret;
/*
--
2.1.4
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