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drm/i915: Extend intel_wakeref to support delayed puts

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In some cases we want to hold onto the wakeref for a little after the
last user so that we can avoid having to drop and then immediately
reacquire it. Allow the last user to specify if they would like to keep
the wakeref alive for a short hysteresis.

v2: Embrace bitfield.h for adjustable flags.

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/20200323103221.14444-1-chris@chris-wilson.co.uk
This commit is contained in:
Chris Wilson 2020-03-23 10:32:21 +00:00
parent 45d4173994
commit e9037e7f9a
4 changed files with 33 additions and 9 deletions
Download patch file Download diff file Expand all files Collapse all files

12
drivers/gpu/drm/i915/intel_wakeref.c
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@ -70,11 +70,12 @@ unlock:
void __intel_wakeref_put_last(struct intel_wakeref *wf, unsigned long flags)
{
INTEL_WAKEREF_BUG_ON(work_pending(&wf->work));
INTEL_WAKEREF_BUG_ON(delayed_work_pending(&wf->work));
/* Assume we are not in process context and so cannot sleep. */
if (flags & INTEL_WAKEREF_PUT_ASYNC || !mutex_trylock(&wf->mutex)) {
schedule_work(&wf->work);
mod_delayed_work(system_wq, &wf->work,
FIELD_GET(INTEL_WAKEREF_PUT_DELAY, flags));
return;
}
@ -83,7 +84,7 @@ void __intel_wakeref_put_last(struct intel_wakeref *wf, unsigned long flags)
static void __intel_wakeref_put_work(struct work_struct *wrk)
{
struct intel_wakeref *wf = container_of(wrk, typeof(*wf), work);
struct intel_wakeref *wf = container_of(wrk, typeof(*wf), work.work);
if (atomic_add_unless(&wf->count, -1, 1))
return;
@ -104,8 +105,9 @@ void __intel_wakeref_init(struct intel_wakeref *wf,
atomic_set(&wf->count, 0);
wf->wakeref = 0;
INIT_WORK(&wf->work, __intel_wakeref_put_work);
lockdep_init_map(&wf->work.lockdep_map, "wakeref.work", &key->work, 0);
INIT_DELAYED_WORK(&wf->work, __intel_wakeref_put_work);
lockdep_init_map(&wf->work.work.lockdep_map,
"wakeref.work", &key->work, 0);
}
int intel_wakeref_wait_for_idle(struct intel_wakeref *wf)