drm/i915: Implement SINGLE_TIMELINE with a syncobj (v4)

This API is entirely unnecessary and I'd love to get rid of it.  If
userspace wants a single timeline across multiple contexts, they can
either use implicit synchronization or a syncobj, both of which existed
at the time this feature landed.  The justification given at the time
was that it would help GL drivers which are inherently single-timeline.
However, neither of our GL drivers actually wanted the feature.  i965
was already in maintenance mode at the time and iris uses syncobj for
everything.

Unfortunately, as much as I'd love to get rid of it, it is used by the
media driver so we can't do that.  We can, however, do the next-best
thing which is to embed a syncobj in the context and do exactly what
we'd expect from userspace internally.  This isn't an entirely identical
implementation because it's no longer atomic if userspace races with
itself by calling execbuffer2 twice simultaneously from different
threads.  It won't crash in that case; it just doesn't guarantee any
ordering between those two submits.  It also means that sync files
exported from different engines on a SINGLE_TIMELINE context will have
different fence contexts.  This is visible to userspace if it looks at
the obj_name field of sync_fence_info.

Moving SINGLE_TIMELINE to a syncobj emulation has a couple of technical
advantages beyond mere annoyance.  One is that intel_timeline is no
longer an api-visible object and can remain entirely an implementation
detail.  This may be advantageous as we make scheduler changes going
forward.  Second is that, together with deleting the CLONE_CONTEXT API,
we should now have a 1:1 mapping between intel_context and
intel_timeline which may help us reduce locking.

v2 (Tvrtko Ursulin):
 - Update the comment on i915_gem_context::syncobj to mention that it's
   an emulation and the possible race if userspace calls execbuffer2
   twice on the same context concurrently.
v2 (Jason Ekstrand):
 - Wrap the checks for eb.gem_context->syncobj in unlikely()
 - Drop the dma_fence reference
 - Improved commit message

v3 (Jason Ekstrand):
 - Move the dma_fence_put() to before the error exit

v4 (Tvrtko Ursulin):
 - Add a comment about fence contexts to the commit message

Signed-off-by: Jason Ekstrand <jason@jlekstrand.net>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20210708154835.528166-8-jason@jlekstrand.net

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context.c b/drivers/gpu/drm/i915/gem/i915_gem_context.c
index 9f9369d..249bd36 100644 (file)
--- a/drivers/gpu/drm/i915/gem/i915_gem_context.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context.c
@@ -67,6 +67,8 @@
 #include <linux/log2.h>
 #include <linux/nospec.h>
 
+#include <drm/drm_syncobj.h>
+
 #include "gt/gen6_ppgtt.h"
 #include "gt/intel_context.h"
 #include "gt/intel_context_param.h"
@@ -224,10 +226,6 @@ static void intel_context_set_gem(struct intel_context *ce,
                ce->vm = vm;
        }
 
-       GEM_BUG_ON(ce->timeline);
-       if (ctx->timeline)
-               ce->timeline = intel_timeline_get(ctx->timeline);
-
        if (ctx->sched.priority >= I915_PRIORITY_NORMAL &&
            intel_engine_has_timeslices(ce->engine))
                __set_bit(CONTEXT_USE_SEMAPHORES, &ce->flags);
@@ -351,9 +349,6 @@ void i915_gem_context_release(struct kref *ref)
        mutex_destroy(&ctx->engines_mutex);
        mutex_destroy(&ctx->lut_mutex);
 
-       if (ctx->timeline)
-               intel_timeline_put(ctx->timeline);
-
        put_pid(ctx->pid);
        mutex_destroy(&ctx->mutex);
 
@@ -570,6 +565,9 @@ static void context_close(struct i915_gem_context *ctx)
        if (vm)
                i915_vm_close(vm);
 
+       if (ctx->syncobj)
+               drm_syncobj_put(ctx->syncobj);
+
        ctx->file_priv = ERR_PTR(-EBADF);
 
        /*
@@ -765,33 +763,11 @@ static void __assign_ppgtt(struct i915_gem_context *ctx,
                i915_vm_close(vm);
 }
 
-static void __set_timeline(struct intel_timeline **dst,
-                          struct intel_timeline *src)
-{
-       struct intel_timeline *old = *dst;
-
-       *dst = src ? intel_timeline_get(src) : NULL;
-
-       if (old)
-               intel_timeline_put(old);
-}
-
-static void __apply_timeline(struct intel_context *ce, void *timeline)
-{
-       __set_timeline(&ce->timeline, timeline);
-}
-
-static void __assign_timeline(struct i915_gem_context *ctx,
-                             struct intel_timeline *timeline)
-{
-       __set_timeline(&ctx->timeline, timeline);
-       context_apply_all(ctx, __apply_timeline, timeline);
-}
-
 static struct i915_gem_context *
 i915_gem_create_context(struct drm_i915_private *i915, unsigned int flags)
 {
        struct i915_gem_context *ctx;
+       int ret;
 
        if (flags & I915_CONTEXT_CREATE_FLAGS_SINGLE_TIMELINE &&
            !HAS_EXECLISTS(i915))
@@ -820,16 +796,13 @@ i915_gem_create_context(struct drm_i915_private *i915, unsigned int flags)
        }
 
        if (flags & I915_CONTEXT_CREATE_FLAGS_SINGLE_TIMELINE) {
-               struct intel_timeline *timeline;
-
-               timeline = intel_timeline_create(&i915->gt);
-               if (IS_ERR(timeline)) {
+               ret = drm_syncobj_create(&ctx->syncobj,
+                                        DRM_SYNCOBJ_CREATE_SIGNALED,
+                                        NULL);
+               if (ret) {
                        context_close(ctx);
-                       return ERR_CAST(timeline);
+                       return ERR_PTR(ret);
                }
-
-               __assign_timeline(ctx, timeline);
-               intel_timeline_put(timeline);
        }
 
        trace_i915_context_create(ctx);

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
index 676592e..df76767 100644 (file)
--- a/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
+++ b/drivers/gpu/drm/i915/gem/i915_gem_context_types.h
@@ -83,7 +83,19 @@ struct i915_gem_context {
        struct i915_gem_engines __rcu *engines;
        struct mutex engines_mutex; /* guards writes to engines */
 
-       struct intel_timeline *timeline;
+       /**
+        * @syncobj: Shared timeline syncobj
+        *
+        * When the SHARED_TIMELINE flag is set on context creation, we
+        * emulate a single timeline across all engines using this syncobj.
+        * For every execbuffer2 call, this syncobj is used as both an in-
+        * and out-fence.  Unlike the real intel_timeline, this doesn't
+        * provide perfect atomic in-order guarantees if the client races
+        * with itself by calling execbuffer2 twice concurrently.  However,
+        * if userspace races with itself, that's not likely to yield well-
+        * defined results anyway so we choose to not care.
+        */
+       struct drm_syncobj *syncobj;
 
        /**
         * @vm: unique address space (GTT)

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index cb86574..380374f 100644 (file)
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -3470,6 +3470,16 @@ i915_gem_do_execbuffer(struct drm_device *dev,
                goto err_vma;
        }
 
+       if (unlikely(eb.gem_context->syncobj)) {
+               struct dma_fence *fence;
+
+               fence = drm_syncobj_fence_get(eb.gem_context->syncobj);
+               err = i915_request_await_dma_fence(eb.request, fence);
+               dma_fence_put(fence);
+               if (err)
+                       goto err_ext;
+       }
+
        if (in_fence) {
                if (args->flags & I915_EXEC_FENCE_SUBMIT)
                        err = i915_request_await_execution(eb.request,
@@ -3527,6 +3537,12 @@ err_request:
                        fput(out_fence->file);
                }
        }
+
+       if (unlikely(eb.gem_context->syncobj)) {
+               drm_syncobj_replace_fence(eb.gem_context->syncobj,
+                                         &eb.request->fence);
+       }
+
        i915_request_put(eb.request);
 
 err_vma: