From: Oscar Mateo <oscar.ma...@intel.com>
As we have said a couple of times by now, logical ring contexts have
their own ringbuffers: not only the backing pages, but the whole
management struct.
In a previous version of the series, this was achieved with two separate
patches:
drm/i915/bdw: Allocate ringbuffer backing objects for default global LRC
drm/i915/bdw: Allocate ringbuffer for user-created LRCs
Signed-off-by: Oscar Mateo <oscar.ma...@intel.com>
---
drivers/gpu/drm/i915/i915_drv.h | 1 +
drivers/gpu/drm/i915/intel_lrc.c | 38 ++++++++++++++++++++++++++++++++++++++
2 files changed, 39 insertions(+)
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 347308e..79799d8 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -599,6 +599,7 @@ struct intel_context {
/* Execlists */
struct {
struct drm_i915_gem_object *obj;
+ struct intel_ringbuffer *ringbuf;
} engine[I915_NUM_RINGS];
struct i915_ctx_hang_stats hang_stats;
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 952212f..b3a23e0 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -60,7 +60,11 @@ void intel_lr_context_free(struct intel_context *ctx)
for (i = 0; i < I915_NUM_RINGS; i++) {
struct drm_i915_gem_object *ctx_obj = ctx->engine[i].obj;
+ struct intel_ringbuffer *ringbuf = ctx->engine[i].ringbuf;
+
if (ctx_obj) {
+ intel_destroy_ring_buffer(ringbuf);
+ kfree(ringbuf);
i915_gem_object_ggtt_unpin(ctx_obj);
drm_gem_object_unreference(&ctx_obj->base);
}
@@ -94,6 +98,7 @@ int intel_lr_context_deferred_create(struct intel_context
*ctx,
struct drm_device *dev = ring->dev;
struct drm_i915_gem_object *ctx_obj;
uint32_t context_size;
+ struct intel_ringbuffer *ringbuf;
int ret;
WARN_ON(ctx->render_obj != NULL);
@@ -114,6 +119,39 @@ int intel_lr_context_deferred_create(struct intel_context
*ctx,
return ret;
}
+ ringbuf = kzalloc(sizeof(*ringbuf), GFP_KERNEL);
+ if (!ringbuf) {
+ DRM_DEBUG_DRIVER("Failed to allocate ringbuffer %s\n",
+ ring->name);
+ i915_gem_object_ggtt_unpin(ctx_obj);
+ drm_gem_object_unreference(&ctx_obj->base);
+ ret = -ENOMEM;
+ return ret;
+ }
+
+ ringbuf->size = 32 * PAGE_SIZE;
+ ringbuf->effective_size = ringbuf->size;
+ ringbuf->head = 0;
+ ringbuf->tail = 0;
+ ringbuf->space = ringbuf->size;
+ ringbuf->last_retired_head = -1;
+
+ /* TODO: For now we put this in the mappable region so that we can reuse
+ * the existing ringbuffer code which ioremaps it. When we start
+ * creating many contexts, this will no longer work and we must switch
+ * to a kmapish interface.
+ */
+ ret = intel_allocate_ring_buffer(dev, ringbuf);
+ if (ret) {
+ DRM_DEBUG_DRIVER("Failed to allocate ringbuffer obj %s: %d\n",
+ ring->name, ret);
+ kfree(ringbuf);
+ i915_gem_object_ggtt_unpin(ctx_obj);
+ drm_gem_object_unreference(&ctx_obj->base);
+ return ret;
+ }
+
+ ctx->engine[ring->id].ringbuf = ringbuf;
ctx->engine[ring->id].obj = ctx_obj;
return 0;
--
1.9.0
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