We rely on only the tasklet being allowed to call into process_csb(), so
assert that is locked when we do. As the tasklet uses a simple bitlock,
there is no strong lockdep checking so we must make do with a plain
assertion that the tasklet is running and assume that we are the
tasklet!
v2: Fixup intel_gt_sanitize() to prepare each engine for the reset so
that the locks are marked as held during the reset
v3: Check for existent function pointers for very early sanitisation.
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
---
drivers/gpu/drm/i915/gt/intel_gt_pm.c | 13 ++++++++++---
drivers/gpu/drm/i915/gt/intel_lrc.c | 7 +++++++
drivers/gpu/drm/i915/i915_gem.h | 5 +++++
3 files changed, 22 insertions(+), 3 deletions(-)
diff --git a/drivers/gpu/drm/i915/gt/intel_gt_pm.c b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
index 87e34e0b6427..bd1bd3e00a94 100644
--- a/drivers/gpu/drm/i915/gt/intel_gt_pm.c
+++ b/drivers/gpu/drm/i915/gt/intel_gt_pm.c
@@ -136,11 +136,18 @@ void intel_gt_sanitize(struct intel_gt *gt, bool force)
intel_uc_sanitize(>->uc);
- if (!reset_engines(gt) && !force)
- return;
+ for_each_engine(engine, gt->i915, id)
+ if (engine->reset.prepare)
+ engine->reset.prepare(engine);
+
+ if (reset_engines(gt) || force) {
+ for_each_engine(engine, gt->i915, id)
+ __intel_engine_reset(engine, false);
+ }
for_each_engine(engine, gt->i915, id)
- __intel_engine_reset(engine, false);
+ if (engine->reset.finish)
+ engine->reset.finish(engine);
}
void intel_gt_pm_disable(struct intel_gt *gt)
diff --git a/drivers/gpu/drm/i915/gt/intel_lrc.c b/drivers/gpu/drm/i915/gt/intel_lrc.c
index 9d8eaf8edaab..484efe3b4273 100644
--- a/drivers/gpu/drm/i915/gt/intel_lrc.c
+++ b/drivers/gpu/drm/i915/gt/intel_lrc.c
@@ -1842,6 +1842,13 @@ static void process_csb(struct intel_engine_cs *engine)
const u8 num_entries = execlists->csb_size;
u8 head, tail;
+ /*
+ * As we modify our execlists state tracking we require exclusive
+ * access. Either we are inside the tasklet, or the tasklet is disabled
+ * and we assume that is only inside the reset paths and so serialised.
+ */
+ GEM_BUG_ON(!tasklet_is_locked(&execlists->tasklet) &&
+ !reset_in_progress(execlists));
GEM_BUG_ON(USES_GUC_SUBMISSION(engine->i915));
/*
diff --git a/drivers/gpu/drm/i915/i915_gem.h b/drivers/gpu/drm/i915/i915_gem.h
index db20d2b0842b..f6f9675848b8 100644
--- a/drivers/gpu/drm/i915/i915_gem.h
+++ b/drivers/gpu/drm/i915/i915_gem.h
@@ -86,6 +86,11 @@ static inline void tasklet_lock(struct tasklet_struct *t)
cpu_relax();
}
+static inline bool tasklet_is_locked(const struct tasklet_struct *t)
+{
+ return test_bit(TASKLET_STATE_RUN, &t->state);
+}
+
static inline void __tasklet_disable_sync_once(struct tasklet_struct *t)
{
if (!atomic_fetch_inc(&t->count))
--
2.23.0
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