diff options
| author | Ben Widawsky <ben@bwidawsk.net> | 2013-06-27 16:30:51 -0700 |
|---|---|---|
| committer | Ben Widawsky <benjamin.widawsky@intel.com> | 2013-12-06 10:53:14 -0800 |
| commit | a4143d564072bf3f69d7d2a76a76fbbcf8372922 (patch) | |
| tree | a636583a58fbed9f2b90de8c9fd65cb896033f8a | |
| parent | afba996be048fd606df354e31f490a2e3c8dc068 (diff) | |
drm/i915: Track which ring a context ran on
Previously we dropped the association of a context to a ring. It is
however very important to know which ring a context ran on (we could
have reused the other member, but I was nitpicky).
This is very important when we switch address spaces, which unlike
context objects, do change per ring.
As an example, if we have:
RCS BCS
ctx A
ctx A
ctx B
ctx B
Without tracking the last ring B ran on, we wouldn't know to switch the
address space on BCS in the last row.
As a result, we no longer need to track which ring a context "belongs"
to, as it never really made much sense anyway.
Signed-off-by: Ben Widawsky <ben@bwidawsk.net>
| -rw-r--r-- | drivers/gpu/drm/i915/i915_drv.h | 2 | ||||
| -rw-r--r-- | drivers/gpu/drm/i915/i915_gem_context.c | 12 |
2 files changed, 6 insertions, 8 deletions
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h index 7cf782fc059f..1d4651c3c321 100644 --- a/drivers/gpu/drm/i915/i915_drv.h +++ b/drivers/gpu/drm/i915/i915_drv.h @@ -695,7 +695,7 @@ struct i915_hw_context { bool is_initialized; uint8_t remap_slice; struct drm_i915_file_private *file_priv; - struct intel_ring_buffer *ring; + struct intel_ring_buffer *last_ring; struct drm_i915_gem_object *obj; struct i915_ctx_hang_stats hang_stats; diff --git a/drivers/gpu/drm/i915/i915_gem_context.c b/drivers/gpu/drm/i915/i915_gem_context.c index f5d60358c758..0c2ff5ab45f4 100644 --- a/drivers/gpu/drm/i915/i915_gem_context.c +++ b/drivers/gpu/drm/i915/i915_gem_context.c @@ -176,11 +176,6 @@ create_hw_context(struct drm_device *dev, goto err_out; } - /* The ring associated with the context object is handled by the normal - * object tracking code. We give an initial ring value simple to pass an - * assertion in the context switch code. - */ - ctx->ring = &dev_priv->ring[RCS]; list_add_tail(&ctx->link, &dev_priv->context_list); /* Default context will never have a file_priv */ @@ -208,7 +203,8 @@ err_out: static inline bool is_default_context(struct i915_hw_context *ctx) { - return (ctx == ctx->ring->default_context); + /* Cheap trick to determine default contexts */ + return ctx->file_priv ? false : true; } /** @@ -338,6 +334,7 @@ void i915_gem_context_fini(struct drm_device *dev) i915_gem_context_unreference(ring->last_context); ring->default_context = NULL; + ring->last_context = NULL; } i915_gem_object_ggtt_unpin(dctx->obj); @@ -465,7 +462,7 @@ static int do_switch(struct intel_ring_buffer *ring, BUG_ON(!i915_gem_obj_is_pinned(from->obj)); } - if (from == to && !to->remap_slice) + if (from == to && from->last_ring == ring && !to->remap_slice) return 0; if (ring != &dev_priv->ring[RCS]) { @@ -555,6 +552,7 @@ done: i915_gem_context_reference(to); ring->last_context = to; to->is_initialized = true; + to->last_ring = ring; return 0; } |