[Mesa-dev] [PATCH 2/3] i915/sync: Implement DRI2_Fence extension
Mauro Rossi
issor.oruam at gmail.com
Thu Jul 14 03:33:16 UTC 2016
Here is the porting of corresponding patch for i965,
i.e. commit c636284 i965/sync: Implement DRI2_Fence extension
Here follows part of original commit message by Chad Versace:
"This enables EGL_KHR_fence_sync and EGL_KHR_wait_sync."
Cc: "12.0" <mesa-stable at lists.freedesktop.org>
---
src/mesa/drivers/dri/i915/intel_screen.c | 1 +
src/mesa/drivers/dri/i915/intel_screen.h | 1 +
src/mesa/drivers/dri/i915/intel_syncobj.c | 180 +++++++++++++++++++++++++-----
3 files changed, 152 insertions(+), 30 deletions(-)
diff --git a/src/mesa/drivers/dri/i915/intel_screen.c b/src/mesa/drivers/dri/i915/intel_screen.c
index 77af328..fa96c6d 100644
--- a/src/mesa/drivers/dri/i915/intel_screen.c
+++ b/src/mesa/drivers/dri/i915/intel_screen.c
@@ -786,6 +786,7 @@ static const __DRI2rendererQueryExtension intelRendererQueryExtension = {
static const __DRIextension *intelScreenExtensions[] = {
&intelTexBufferExtension.base,
+ &intelFenceExtension.base,
&intelFlushExtension.base,
&intelImageExtension.base,
&intelRendererQueryExtension.base,
diff --git a/src/mesa/drivers/dri/i915/intel_screen.h b/src/mesa/drivers/dri/i915/intel_screen.h
index 3518572..891894d 100644
--- a/src/mesa/drivers/dri/i915/intel_screen.h
+++ b/src/mesa/drivers/dri/i915/intel_screen.h
@@ -162,6 +162,7 @@ extern void intelDestroyContext(__DRIcontext * driContextPriv);
extern GLboolean intelUnbindContext(__DRIcontext * driContextPriv);
const __DRIextension **__driDriverGetExtensions_i915(void);
+extern const __DRI2fenceExtension intelFenceExtension;
extern GLboolean
intelMakeCurrent(__DRIcontext * driContextPriv,
diff --git a/src/mesa/drivers/dri/i915/intel_syncobj.c b/src/mesa/drivers/dri/i915/intel_syncobj.c
index 33f2fd4..18d1546 100644
--- a/src/mesa/drivers/dri/i915/intel_syncobj.c
+++ b/src/mesa/drivers/dri/i915/intel_syncobj.c
@@ -25,11 +25,11 @@
*
*/
-/** @file intel_syncobj.c
+/**
+ * \file
+ * \brief Support for GL_ARB_sync and EGL_KHR_fence_sync.
*
- * Support for ARB_sync
- *
- * ARB_sync is implemented by flushing the current batchbuffer and keeping a
+ * GL_ARB_sync is implemented by flushing the current batchbuffer and keeping a
* reference on it. We can then check for completion or wait for completion
* using the normal buffer object mechanisms. This does mean that if an
* application is using many sync objects, it will emit small batchbuffers
@@ -45,13 +45,94 @@
#include "intel_batchbuffer.h"
#include "intel_reg.h"
+struct intel_fence {
+ /** The fence waits for completion of this batch. */
+ drm_intel_bo *batch_bo;
+
+ bool signalled;
+};
+
struct intel_gl_sync_object {
struct gl_sync_object Base;
-
- /** Batch associated with this sync object */
- drm_intel_bo *bo;
+ struct intel_fence fence;
};
+static void
+intel_fence_finish(struct intel_fence *fence)
+{
+ if (fence->batch_bo)
+ drm_intel_bo_unreference(fence->batch_bo);
+}
+
+static void
+intel_fence_insert(struct intel_context *intel, struct intel_fence *fence)
+{
+ assert(!fence->batch_bo);
+ assert(!fence->signalled);
+
+ intel_batchbuffer_emit_mi_flush(intel);
+ fence->batch_bo = intel->batch.bo;
+ drm_intel_bo_reference(fence->batch_bo);
+ intel_batchbuffer_flush(intel);
+}
+
+static bool
+intel_fence_has_completed(struct intel_fence *fence)
+{
+ if (fence->signalled)
+ return true;
+
+ if (fence->batch_bo && !drm_intel_bo_busy(fence->batch_bo)) {
+ drm_intel_bo_unreference(fence->batch_bo);
+ fence->batch_bo = NULL;
+ fence->signalled = true;
+ return true;
+ }
+
+ return false;
+}
+
+/**
+ * Return true if the function successfully signals or has already signalled.
+ * (This matches the behavior expected from __DRI2fence::client_wait_sync).
+ */
+static bool
+intel_fence_client_wait(struct intel_context *intel, struct intel_fence *fence,
+ uint64_t timeout)
+{
+ if (fence->signalled)
+ return true;
+
+ assert(fence->batch_bo);
+
+ /* DRM_IOCTL_I915_GEM_WAIT uses a signed 64 bit timeout and returns
+ * immediately for timeouts <= 0. The best we can do is to clamp the
+ * timeout to INT64_MAX. This limits the maximum timeout from 584 years to
+ * 292 years - likely not a big deal.
+ */
+ if (timeout > INT64_MAX)
+ timeout = INT64_MAX;
+
+ if (drm_intel_gem_bo_wait(fence->batch_bo, timeout) != 0)
+ return false;
+
+ fence->signalled = true;
+ drm_intel_bo_unreference(fence->batch_bo);
+ fence->batch_bo = NULL;
+
+ return true;
+}
+
+static void
+intel_fence_server_wait(struct intel_context *intel, struct intel_fence *fence)
+{
+ /* We have nothing to do for WaitSync. Our GL command stream is sequential,
+ * so given that the sync object has already flushed the batchbuffer, any
+ * batchbuffers coming after this waitsync will naturally not occur until
+ * the previous one is done.
+ */
+}
+
static struct gl_sync_object *
intel_gl_new_sync_object(struct gl_context *ctx, GLuint id)
{
@@ -69,9 +150,7 @@ intel_gl_delete_sync_object(struct gl_context *ctx, struct gl_sync_object *s)
{
struct intel_gl_sync_object *sync = (struct intel_sync_object *)s;
- if (sync->bo)
- drm_intel_bo_unreference(sync->bo);
-
+ intel_fence_finish(&sync->fence);
free(sync);
}
@@ -82,37 +161,28 @@ intel_gl_fence_sync(struct gl_context *ctx, struct gl_sync_object *s,
struct intel_context *intel = intel_context(ctx);
struct intel_gl_sync_object *sync = (struct intel_sync_object *)s;
- assert(condition == GL_SYNC_GPU_COMMANDS_COMPLETE);
- intel_batchbuffer_emit_mi_flush(intel);
-
- sync->bo = intel->batch.bo;
- drm_intel_bo_reference(sync->bo);
-
- intel_flush(ctx);
+ intel_fence_insert(intel, &sync->fence);
}
static void
intel_gl_client_wait_sync(struct gl_context *ctx, struct gl_sync_object *s,
GLbitfield flags, GLuint64 timeout)
{
+ struct intel_context *intel = intel_context(ctx);
struct intel_gl_sync_object *sync = (struct intel_sync_object *)s;
- if (sync->bo && drm_intel_gem_bo_wait(sync->bo, timeout) == 0) {
+ if (intel_fence_client_wait(intel, &sync->fence, timeout))
s->StatusFlag = 1;
- drm_intel_bo_unreference(sync->bo);
- sync->bo = NULL;
- }
}
-/* We have nothing to do for WaitSync. Our GL command stream is sequential,
- * so given that the sync object has already flushed the batchbuffer,
- * any batchbuffers coming after this waitsync will naturally not occur until
- * the previous one is done.
- */
static void
intel_gl_server_wait_sync(struct gl_context *ctx, struct gl_sync_object *s,
GLbitfield flags, GLuint64 timeout)
{
+ struct intel_context *intel = intel_context(ctx);
+ struct intel_gl_sync_object *sync = (struct intel_gl_sync_object *)s;
+
+ intel_fence_server_wait(intel, &sync->fence);
}
static void
@@ -120,11 +190,8 @@ intel_gl_check_sync(struct gl_context *ctx, struct gl_sync_object *s)
{
struct intel_gl_sync_object *sync = (struct intel_sync_object *)s;
- if (sync->bo && !drm_intel_bo_busy(sync->bo)) {
- drm_intel_bo_unreference(sync->bo);
- sync->bo = NULL;
+ if (intel_fence_has_completed(&sync->fence))
s->StatusFlag = 1;
- }
}
void
@@ -137,3 +204,56 @@ intel_init_syncobj_functions(struct dd_function_table *functions)
functions->ClientWaitSync = intel_gl_client_wait_sync;
functions->ServerWaitSync = intel_gl_server_wait_sync;
}
+
+static void *
+intel_dri_create_fence(__DRIcontext *ctx)
+{
+ struct intel_context *intel = ctx->driverPrivate;
+ struct intel_fence *fence;
+
+ fence = calloc(1, sizeof(*fence));
+ if (!fence)
+ return NULL;
+
+ intel_fence_insert(intel, fence);
+
+ return fence;
+}
+
+static void
+intel_dri_destroy_fence(__DRIscreen *screen, void *driver_fence)
+{
+ struct intel_fence *fence = driver_fence;
+
+ intel_fence_finish(fence);
+ free(fence);
+}
+
+static GLboolean
+intel_dri_client_wait_sync(__DRIcontext *ctx, void *driver_fence, unsigned flags,
+ uint64_t timeout)
+{
+ struct intel_context *intel = ctx->driverPrivate;
+ struct intel_fence *fence = driver_fence;
+
+ return intel_fence_client_wait(intel, fence, timeout);
+}
+
+static void
+intel_dri_server_wait_sync(__DRIcontext *ctx, void *driver_fence, unsigned flags)
+{
+ struct intel_context *intel = ctx->driverPrivate;
+ struct intel_fence *fence = driver_fence;
+
+ intel_fence_server_wait(intel, fence);
+}
+
+const __DRI2fenceExtension intelFenceExtension = {
+ .base = { __DRI2_FENCE, 1 },
+
+ .create_fence = intel_dri_create_fence,
+ .destroy_fence = intel_dri_destroy_fence,
+ .client_wait_sync = intel_dri_client_wait_sync,
+ .server_wait_sync = intel_dri_server_wait_sync,
+ .get_fence_from_cl_event = NULL,
+};
--
2.7.4
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