We leave the kernel_context on the HW as we suspend (and while idle).
There is no guarantee that is complete in memory, so we try to inhibit
restoration from the kernel_context. Reinforce the inhibition by
scrubbing the context.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Matthew Auld <matthew.auld@xxxxxxxxx>
---
drivers/gpu/drm/i915/gt/intel_lrc.c | 11 ++++++++++-
drivers/gpu/drm/i915/gt/intel_ring_submission.c | 2 +-
2 files changed, 11 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index b36fd108f0c6..b21a191bda3b 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -2602,6 +2602,9 @@ static int execlists_context_alloc(struct intel_context *ce)
static void execlists_context_reset(struct intel_context *ce)
{
+ CE_TRACE(ce, "reset\n");
+ GEM_BUG_ON(!intel_context_is_pinned(ce));
+
/*
* Because we emit WA_TAIL_DWORDS there may be a disparity
* between our bookkeeping in ce->ring->head and ce->ring->tail and
@@ -2618,8 +2621,14 @@ static void execlists_context_reset(struct intel_context *ce)
* So to avoid that we reset the context images upon resume. For
* simplicity, we just zero everything out.
*/
- intel_ring_reset(ce->ring, 0);
+ intel_ring_reset(ce->ring, ce->ring->emit);
+
+ /* Scrub away the garbage */
+ execlists_init_reg_state(ce->lrc_reg_state,
+ ce, ce->engine, ce->ring, true);
__execlists_update_reg_state(ce, ce->engine);
+
+ ce->lrc_desc |= CTX_DESC_FORCE_RESTORE;
}
static const struct intel_context_ops execlists_context_ops = {
diff --git a/drivers/gpu/drm/i915/gt/intel_ring_submission.c b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
index 48dbe46edbff..2e1478a48a4b 100644
--- a/drivers/gpu/drm/i915/gt/intel_ring_submission.c
+++ b/drivers/gpu/drm/i915/gt/intel_ring_submission.c
@@ -1347,7 +1347,7 @@ static int ring_context_pin(struct intel_context *ce)
static void ring_context_reset(struct intel_context *ce)
{
- intel_ring_reset(ce->ring, 0);
+ intel_ring_reset(ce->ring, ce->ring->emit);
}
static const struct intel_context_ops ring_context_ops = {
--
2.25.0.rc0
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