[PATCH v6 20/25] drm/i915: Move the magical deferred context allocation into the request

Chris Wilson
2016-04-26T20:06:57Z

We can hide more details of execlists from higher level code by removing
the explicit call to create an execlist context from execbuffer and
into its first use by execlists.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
---
drivers/gpu/drm/i915/i915_gem_execbuffer.c | 8 --------
drivers/gpu/drm/i915/intel_lrc.c | 19 +++++++++++++------
drivers/gpu/drm/i915/intel_lrc.h | 2 --
3 files changed, 13 insertions(+), 16 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
index 6f4f2a6cdf93..e0ee5d1ac372 100644
--- a/drivers/gpu/drm/i915/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/i915_gem_execbuffer.c
@@ -1085,14 +1085,6 @@ i915_gem_validate_context(struct drm_device *dev, struct drm_file *file,
return ERR_PTR(-EIO);
}

- if (i915.enable_execlists && !ctx->engine[engine->id].state) {
- int ret = intel_lr_context_deferred_alloc(ctx, engine);
- if (ret) {
- DRM_DEBUG("Could not create LRC %u: %d\n", ctx_id, ret);
- return ERR_PTR(ret);
- }
- }
-
return ctx;
}

diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index f74c77cf2b52..4be11f8d0e04 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -228,6 +228,8 @@ enum {
#define GEN8_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT 0x17
#define GEN9_CTX_RCS_INDIRECT_CTX_OFFSET_DEFAULT 0x26

+static int execlists_context_deferred_alloc(struct intel_context *ctx,
+ struct intel_engine_cs *engine);
static int intel_lr_context_pin(struct intel_context *ctx,
struct intel_engine_cs *engine);

@@ -685,6 +687,12 @@ int intel_logical_ring_alloc_request_extras(struct drm_i915_gem_request *request
*/
request->reserved_space += MIN_SPACE_FOR_ADD_REQUEST;

+ if (request->ctx->engine[engine->id].state == NULL) {
+ ret = execlists_context_deferred_alloc(request->ctx, engine);
+ if (ret)
+ return ret;
+ }
+
request->ringbuf = request->ctx->engine[engine->id].ringbuf;

if (i915.enable_guc_submission) {
@@ -2006,7 +2014,7 @@ logical_ring_init(struct drm_device *dev, struct intel_engine_cs *engine)
if (ret)
goto error;

- ret = intel_lr_context_deferred_alloc(dctx, engine);
+ ret = execlists_context_deferred_alloc(dctx, engine);
if (ret)
goto error;

@@ -2480,9 +2488,9 @@ uint32_t intel_lr_context_size(struct intel_engine_cs *engine)
}

/**
- * intel_lr_context_deferred_alloc() - create the LRC specific bits of a context
+ * execlists_context_deferred_alloc() - create the LRC specific bits of a context
* @ctx: LR context to create.
- * @ring: engine to be used with the context.
+ * @engine: engine to be used with the context.
*
* This function can be called more than once, with different engines, if we plan
* to use the context with them. The context backing objects and the ringbuffers
@@ -2492,9 +2500,8 @@ uint32_t intel_lr_context_size(struct intel_engine_cs *engine)
*
* Return: non-zero on error.
*/
-
-int intel_lr_context_deferred_alloc(struct intel_context *ctx,
- struct intel_engine_cs *engine)
+static int execlists_context_deferred_alloc(struct intel_context *ctx,
+ struct intel_engine_cs *engine)
{
struct drm_device *dev = engine->dev;
struct drm_i915_gem_object *ctx_obj;
diff --git a/drivers/gpu/drm/i915/intel_lrc.h b/drivers/gpu/drm/i915/intel_lrc.h
index 9510826f0d90..28ff324ba5dc 100644
--- a/drivers/gpu/drm/i915/intel_lrc.h
+++ b/drivers/gpu/drm/i915/intel_lrc.h
@@ -101,8 +101,6 @@ static inline void intel_logical_ring_emit_reg(struct intel_ringbuffer *ringbuf,

void intel_lr_context_free(struct intel_context *ctx);
uint32_t intel_lr_context_size(struct intel_engine_cs *engine);
-int intel_lr_context_deferred_alloc(struct intel_context *ctx,
- struct intel_engine_cs *engine);
void intel_lr_context_unpin(struct intel_context *ctx,
struct intel_engine_cs *engine);