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drm/i915: Explicitly track active fw_domain timers

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Stop guessing over whether we have an extra wakeref held by the delayed
fw put, and track it explicitly for the sake of debug.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190708154914.26850-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2019-07-08 16:49:14 +01:00
parent 15e7facb7b
commit 77adbd8fbf
2 changed files with 9 additions and 7 deletions
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15
drivers/gpu/drm/i915/intel_uncore.c
View File

@ -78,6 +78,8 @@ fw_domain_reset(const struct intel_uncore_forcewake_domain *d)
static inline void
fw_domain_arm_timer(struct intel_uncore_forcewake_domain *d)
{
GEM_BUG_ON(d->uncore->fw_domains_timer & d->mask);
d->uncore->fw_domains_timer |= d->mask;
d->wake_count++;
hrtimer_start_range_ns(&d->timer,
NSEC_PER_MSEC,
@ -353,9 +355,10 @@ intel_uncore_fw_release_timer(struct hrtimer *timer)
return HRTIMER_RESTART;
spin_lock_irqsave(&uncore->lock, irqflags);
if (WARN_ON(domain->wake_count == 0))
domain->wake_count++;
uncore->fw_domains_timer &= ~domain->mask;
GEM_BUG_ON(!domain->wake_count);
if (--domain->wake_count == 0)
uncore->funcs.force_wake_put(uncore, domain->mask);
@ -673,8 +676,7 @@ static void __intel_uncore_forcewake_put(struct intel_uncore *uncore,
fw_domains &= uncore->fw_domains;
for_each_fw_domain_masked(domain, fw_domains, uncore, tmp) {
if (WARN_ON(domain->wake_count == 0))
continue;
GEM_BUG_ON(!domain->wake_count);
if (--domain->wake_count) {
domain->active = true;
@ -764,7 +766,7 @@ void assert_forcewakes_active(struct intel_uncore *uncore,
unsigned int actual = READ_ONCE(domain->wake_count);
unsigned int expect = 1;
if (hrtimer_active(&domain->timer) && READ_ONCE(domain->active))
if (uncore->fw_domains_timer & domain->mask)
expect++; /* pending automatic release */
if (WARN(actual < expect,
@ -1160,8 +1162,7 @@ static noinline void ___force_wake_auto(struct intel_uncore *uncore,
static inline void __force_wake_auto(struct intel_uncore *uncore,
enum forcewake_domains fw_domains)
{
if (WARN_ON(!fw_domains))
return;
GEM_BUG_ON(!fw_domains);
/* Turn on all requested but inactive supported forcewake domains. */
fw_domains &= uncore->fw_domains;

1
drivers/gpu/drm/i915/intel_uncore.h
View File

@ -123,6 +123,7 @@ struct intel_uncore {
enum forcewake_domains fw_domains;
enum forcewake_domains fw_domains_active;
enum forcewake_domains fw_domains_timer;
enum forcewake_domains fw_domains_saved; /* user domains saved for S3 */
struct intel_uncore_forcewake_domain {