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drm/i915: Export a function to flush the context upon pinning

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For legacy contexts we employ an optimisation to only flush the context
when binding into the global GTT. This avoids stalling on the GPU when
reloading an active context. Wrap this detail up into a helper and
export it for a potential third user. (Longer term, context pinning
needs to be reworked as the current handling of switch context pins too
late and so risks eviction and corrupting the request. Plans, plans,
plans.)

v2: Expand the comment explaining the optimisation for avoiding the
stall on active contexts.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Link: http://patchwork.freedesktop.org/patch/msgid/20161030132820.32163-1-chris@chris-wilson.co.uk
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
This commit is contained in:
Chris Wilson
2016-10-30 13:28:20 +00:00
parent 03af79e0b8
commit 07c9a21a0d
3 changed files with 36 additions and 17 deletions
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11
drivers/gpu/drm/i915/intel_ringbuffer.c
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@@ -1949,14 +1949,13 @@ static int intel_ring_context_pin(struct i915_gem_context *ctx,
return 0;
if (ce->state) {
ret = i915_gem_object_set_to_gtt_domain(ce->state->obj, false);
if (ret)
goto error;
struct i915_vma *vma;
ret = i915_vma_pin(ce->state, 0, ctx->ggtt_alignment,
PIN_GLOBAL | PIN_HIGH);
if (ret)
vma = i915_gem_context_pin_legacy(ctx, PIN_HIGH);
if (IS_ERR(vma)) {
ret = PTR_ERR(vma);
goto error;
}
}
/* The kernel context is only used as a placeholder for flushing the