To use the legacy BSD selector, you must have a second VCS engine, or
else the ABI simply maps the request for another engine onto VCS0.
However, we only checked a single VCS1 location and overlooking the
possibility of a sparse VCS set being mapped to the dense ABI.
v2: num_vcs_engines() turns out to be reusable and futureproof it so we
never have to worry about this silly bit of ABI again!
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c | 8 +++++++-
1 file changed, 7 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 566e8a4844cf..dc8b80c6c317 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -2102,6 +2102,12 @@ static int eb_submit(struct i915_execbuffer *eb)
return 0;
}
+static int num_vcs_engines(const struct drm_i915_private *i915)
+{
+ return hweight64(INTEL_INFO(i915)->engine_mask &
+ GENMASK_ULL(VCS0 + I915_MAX_VCS, VCS0));
+}
+
/*
* Find one BSD ring to dispatch the corresponding BSD command.
* The engine index is returned.
@@ -2200,7 +2206,7 @@ eb_select_legacy_ring(struct i915_execbuffer *eb,
return -1;
}
- if (user_ring_id == I915_EXEC_BSD && HAS_ENGINE(i915, VCS1)) {
+ if (user_ring_id == I915_EXEC_BSD && num_vcs_engines(i915) > 1) {
unsigned int bsd_idx = args->flags & I915_EXEC_BSD_MASK;
if (bsd_idx == I915_EXEC_BSD_DEFAULT) {
--
2.23.0.rc1
_______________________________________________
Intel-gfx mailing list
Intel-gfx@xxxxxxxxxxxxxxxxxxxxx
https://lists.freedesktop.org/mailman/listinfo/intel-gfx
