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drm/i915: Track which ring a context ran on

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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>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Ben Widawsky 2013-12-06 14:11:02 -08:00 committed by Daniel Vetter
parent 67e3d2979b
commit 0009e46cd5
2 changed files with 6 additions and 8 deletions
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2
drivers/gpu/drm/i915/i915_drv.h
View File

@ -696,7 +696,7 @@ 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;

12
drivers/gpu/drm/i915/i915_gem_context.c
View File

@ -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 @@ create_hw_context(struct drm_device *dev,
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);
@ -467,7 +464,7 @@ 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]) {
@ -547,6 +544,7 @@ static int do_switch(struct intel_ring_buffer *ring,
i915_gem_context_reference(to);
ring->last_context = to;
to->is_initialized = true;
to->last_ring = ring;
return 0;
}