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drm/i915: Serialise with remote retirement 

Since retirement may be running in a worker on another CPU, it may be
skipped in the local intel_gt_wait_for_idle(). To ensure the state is
consistent for our sanity checks upon load, serialise with the remote
retirer by waiting on the timeline->mutex.

Outside of this use case, e.g. on suspend or module unload, we expect the
slack to be picked up by intel_gt_pm_wait_for_idle() and so prefer to
put the special case serialisation with retirement in its single user,
for now at least.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191121071044.97798-2-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-11-21 07:10:41 +00:00
parent 689122dcc3
commit 2d0fb25136
1 changed files with 23 additions and 3 deletions
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26
drivers/gpu/drm/i915/i915_gem.c
View File

@ -45,6 +45,7 @@
#include "gem/i915_gem_context.h"
#include "gem/i915_gem_ioctls.h"
#include "gem/i915_gem_pm.h"
#include "gt/intel_context.h"
#include "gt/intel_engine_user.h"
#include "gt/intel_gt.h"
#include "gt/intel_gt_pm.h"
@ -1041,6 +1042,18 @@ out:
return err;
}
static int __intel_context_flush_retire(struct intel_context *ce)
{
struct intel_timeline *tl;
tl = intel_context_timeline_lock(ce);
if (IS_ERR(tl))
return PTR_ERR(tl);
intel_context_timeline_unlock(tl);
return 0;
}
static int __intel_engines_record_defaults(struct intel_gt *gt)
{
struct i915_request *requests[I915_NUM_ENGINES] = {};
@ -1109,13 +1122,20 @@ err_rq:
if (!rq)
continue;
/* We want to be able to unbind the state from the GGTT */
GEM_BUG_ON(intel_context_is_pinned(rq->hw_context));
GEM_BUG_ON(!test_bit(CONTEXT_ALLOC_BIT,
&rq->hw_context->flags));
state = rq->hw_context->state;
if (!state)
continue;
/* Serialise with retirement on another CPU */
err = __intel_context_flush_retire(rq->hw_context);
if (err)
goto out;
/* We want to be able to unbind the state from the GGTT */
GEM_BUG_ON(intel_context_is_pinned(rq->hw_context));
/*
* As we will hold a reference to the logical state, it will
* not be torn down with the context, and importantly the