On 13/09/2018 18:32, Chris Wilson wrote:
Now that we reload both RING_HEAD and RING_TAIL when rebinding the
context, we do not need to scrub those registers immediately on resume.
v2: Handle the perma-pinned contexts.
v3: Set RING_TAIL on context-pin so that we always have known state in
the context image for the ring registers and all parties have similar
code (ripe for refactoring).
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Cc: Mika Kuoppala <mika.kuoppala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/intel_lrc.c | 33 +++++++++++++++-----------------
1 file changed, 15 insertions(+), 18 deletions(-)
diff --git a/drivers/gpu/drm/i915/intel_lrc.c b/drivers/gpu/drm/i915/intel_lrc.c
index 9b1f0e5211a0..d7fcbba8e982 100644
--- a/drivers/gpu/drm/i915/intel_lrc.c
+++ b/drivers/gpu/drm/i915/intel_lrc.c
@@ -1338,11 +1338,13 @@ __execlists_context_pin(struct intel_engine_cs *engine,
intel_lr_context_descriptor_update(ctx, engine, ce);
+ GEM_BUG_ON(!intel_ring_offset_valid(ce->ring, ce->ring->head));
+
ce->lrc_reg_state = vaddr + LRC_STATE_PN * PAGE_SIZE;
ce->lrc_reg_state[CTX_RING_BUFFER_START+1] =
i915_ggtt_offset(ce->ring->vma);
- GEM_BUG_ON(!intel_ring_offset_valid(ce->ring, ce->ring->head));
- ce->lrc_reg_state[CTX_RING_HEAD+1] = ce->ring->head;
+ ce->lrc_reg_state[CTX_RING_HEAD + 1] = ce->ring->head;
+ ce->lrc_reg_state[CTX_RING_TAIL + 1] = ce->ring->tail;
ce->state->obj->pin_global++;
i915_gem_context_get(ctx);
@@ -2841,13 +2843,14 @@ static int execlists_context_deferred_alloc(struct i915_gem_context *ctx,
return ret;
}
-void intel_lr_context_resume(struct drm_i915_private *dev_priv)
+void intel_lr_context_resume(struct drm_i915_private *i915)
{
struct intel_engine_cs *engine;
struct i915_gem_context *ctx;
enum intel_engine_id id;
- /* Because we emit WA_TAIL_DWORDS there may be a disparity
+ /*
+ * Because we emit WA_TAIL_DWORDS there may be a disparity
* between our bookkeeping in ce->ring->head and ce->ring->tail and
* that stored in context. As we only write new commands from
* ce->ring->tail onwards, everything before that is junk. If the GPU
@@ -2857,28 +2860,22 @@ void intel_lr_context_resume(struct drm_i915_private *dev_priv)
* So to avoid that we reset the context images upon resume. For
* simplicity, we just zero everything out.
*/
- list_for_each_entry(ctx, &dev_priv->contexts.list, link) {
- for_each_engine(engine, dev_priv, id) {
+ list_for_each_entry(ctx, &i915->contexts.list, link) {
+ for_each_engine(engine, i915, id) {
struct intel_context *ce =
to_intel_context(ctx, engine);
- u32 *reg;
if (!ce->state)
continue;
- reg = i915_gem_object_pin_map(ce->state->obj,
- I915_MAP_WB);
- if (WARN_ON(IS_ERR(reg)))
- continue;
-
- reg += LRC_STATE_PN * PAGE_SIZE / sizeof(*reg);
- reg[CTX_RING_HEAD+1] = 0;
- reg[CTX_RING_TAIL+1] = 0;
+ intel_ring_reset(ce->ring, 0);
- ce->state->obj->mm.dirty = true;
- i915_gem_object_unpin_map(ce->state->obj);
+ if (ce->pin_count) { /* otherwise done in context_pin */
+ u32 *regs = ce->lrc_reg_state;
- intel_ring_reset(ce->ring, 0);
+ regs[CTX_RING_HEAD + 1] = ce->ring->head;
+ regs[CTX_RING_TAIL + 1] = ce->ring->tail;
+ }
}
}
}
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Regards,
Tvrtko
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