On 19/03/2019 11:57, Chris Wilson wrote:
Allow the user to specify a local engine index (as opposed to
class:index) that they can use to refer to a preset engine inside the
ctx->engine[] array defined by an earlier I915_CONTEXT_PARAM_ENGINES.
This will be useful for setting SSEU parameters on virtual engines that
are local to the context and do not have a valid global class:instance
lookup.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem_context.c | 24 ++++++++++++++++++++----
include/uapi/drm/i915_drm.h | 3 ++-
2 files changed, 22 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c
index f038c15e73d8..cbd76ef95115 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -1381,6 +1381,7 @@ static int set_sseu(struct i915_gem_context *ctx,
struct drm_i915_gem_context_param_sseu user_sseu;
struct intel_engine_cs *engine;
struct intel_sseu sseu;
+ unsigned long lookup;
int ret;
if (args->size < sizeof(user_sseu))
@@ -1393,10 +1394,17 @@ static int set_sseu(struct i915_gem_context *ctx,
sizeof(user_sseu)))
return -EFAULT;
- if (user_sseu.flags || user_sseu.rsvd)
+ if (user_sseu.rsvd)
return -EINVAL;
- engine = lookup_user_engine(ctx, 0,
+ if (user_sseu.flags & ~(I915_CONTEXT_SSEU_FLAG_ENGINE_INDEX))
+ return -EINVAL;
+
+ lookup = 0;
+ if (user_sseu.flags & I915_CONTEXT_SSEU_FLAG_ENGINE_INDEX)
+ lookup |= LOOKUP_USER_INDEX;
+
+ engine = lookup_user_engine(ctx, lookup,
user_sseu.engine_class,
user_sseu.engine_instance);
if (!engine)
@@ -1967,6 +1975,7 @@ static int get_sseu(struct i915_gem_context *ctx,
struct drm_i915_gem_context_param_sseu user_sseu;
struct intel_engine_cs *engine;
struct intel_context *ce;
+ unsigned long lookup;
if (args->size == 0)
goto out;
@@ -1977,10 +1986,17 @@ static int get_sseu(struct i915_gem_context *ctx,
sizeof(user_sseu)))
return -EFAULT;
- if (user_sseu.flags || user_sseu.rsvd)
+ if (user_sseu.rsvd)
return -EINVAL;
- engine = lookup_user_engine(ctx, 0,
+ if (user_sseu.flags & ~(I915_CONTEXT_SSEU_FLAG_ENGINE_INDEX))
+ return -EINVAL;
+
+ lookup = 0;
+ if (user_sseu.flags & I915_CONTEXT_SSEU_FLAG_ENGINE_INDEX)
+ lookup |= LOOKUP_USER_INDEX;
+
+ engine = lookup_user_engine(ctx, lookup,
user_sseu.engine_class,
user_sseu.engine_instance);
if (!engine)
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 4e67c2395b46..8ef6d60929c6 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -1567,9 +1567,10 @@ struct drm_i915_gem_context_param_sseu {
__u16 engine_instance;
/*
- * Unused for now. Must be cleared to zero.
+ * Unknown flags must be cleared to zero.
*/
__u32 flags;
+#define I915_CONTEXT_SSEU_FLAG_ENGINE_INDEX (1u << 0)
/*
* Mask of slices to enable for the context. Valid values are a subset
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Regards,
Tvrtko
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