For the default I915_EXEC_BSD round robin selector, it may select any
available VCS engine. Make it so.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursu...@intel.com>
Cc: Joonas Lahtinen <joonas.lahti...@linux.intel.com>
---
drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index 7fdb2ec94aff..7784a314f5c2 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -2102,6 +2102,13 @@ static int eb_submit(struct i915_execbuffer *eb)
return 0;
}
+static int num_vcs_engines(const struct drm_i915_private *i915)
+{
+ BUILD_BUG_ON(I915_MAX_VCS > 8); /* using hweight8() */
+ return hweight8(INTEL_INFO(i915)->engine_mask >> VCS0 &
+ (I915_MAX_VCS - 1));
+}
+
/*
* Find one BSD ring to dispatch the corresponding BSD command.
* The engine index is returned.
@@ -2114,7 +2121,8 @@ gen8_dispatch_bsd_engine(struct drm_i915_private
*dev_priv,
/* Check whether the file_priv has already selected one ring. */
if ((int)file_priv->bsd_engine < 0)
- file_priv->bsd_engine = get_random_int() & 1;
+ file_priv->bsd_engine =
+ get_random_int() % num_vcs_engines(dev_priv);
return file_priv->bsd_engine;
}
--
2.23.0.rc1
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