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.
Note that due to the ambiguity in using class:instance with
ctx->engines[], if a user supplied engine map is active the user must
specify the engine to alter by its index into the ctx->engines[].
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Reviewed-by: 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 c501e2848ca0..d38d8a45a5cf 100644
--- a/drivers/gpu/drm/i915/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/i915_gem_context.c
@@ -1363,6 +1363,7 @@ static int set_sseu(struct i915_gem_context *ctx,
struct drm_i915_gem_context_param_sseu user_sseu;
struct intel_context *ce;
struct intel_sseu sseu;
+ unsigned long lookup;
int ret;
if (args->size < sizeof(user_sseu))
@@ -1375,10 +1376,17 @@ 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;
- ce = lookup_user_engine(ctx, 0, &user_sseu.engine);
+ 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;
+
+ ce = lookup_user_engine(ctx, lookup, &user_sseu.engine);
if (IS_ERR(ce))
return PTR_ERR(ce);
@@ -1821,6 +1829,7 @@ static int get_sseu(struct i915_gem_context *ctx,
{
struct drm_i915_gem_context_param_sseu user_sseu;
struct intel_context *ce;
+ unsigned long lookup;
int err;
if (args->size == 0)
@@ -1832,10 +1841,17 @@ 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;
- ce = lookup_user_engine(ctx, 0, &user_sseu.engine);
+ 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;
+
+ ce = lookup_user_engine(ctx, lookup, &user_sseu.engine);
if (IS_ERR(ce))
return PTR_ERR(ce);
diff --git a/include/uapi/drm/i915_drm.h b/include/uapi/drm/i915_drm.h
index 8e1bb22926e4..82bd488ed0d1 100644
--- a/include/uapi/drm/i915_drm.h
+++ b/include/uapi/drm/i915_drm.h
@@ -1576,9 +1576,10 @@ struct drm_i915_gem_context_param_sseu {
struct i915_engine_class_instance engine;
/*
- * 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
--
2.20.1
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