mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-25 23:25:37 +07:00
58a111f03a
intel_runtime_pm is the only thing they use from the i915 structure, so use that directly. Signed-off-by: Daniele Ceraolo Spurio <daniele.ceraolospurio@intel.com> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Link: https://patchwork.freedesktop.org/patch/msgid/20190613232156.34940-9-daniele.ceraolospurio@intel.com
139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
/*
|
|
* SPDX-License-Identifier: MIT
|
|
*
|
|
* Copyright © 2019 Intel Corporation
|
|
*/
|
|
|
|
#include "intel_runtime_pm.h"
|
|
#include "i915_gem.h"
|
|
|
|
static void rpm_get(struct intel_runtime_pm *rpm, struct intel_wakeref *wf)
|
|
{
|
|
wf->wakeref = intel_runtime_pm_get(rpm);
|
|
}
|
|
|
|
static void rpm_put(struct intel_runtime_pm *rpm, struct intel_wakeref *wf)
|
|
{
|
|
intel_wakeref_t wakeref = fetch_and_zero(&wf->wakeref);
|
|
|
|
intel_runtime_pm_put(rpm, wakeref);
|
|
GEM_BUG_ON(!wakeref);
|
|
}
|
|
|
|
int __intel_wakeref_get_first(struct intel_runtime_pm *rpm,
|
|
struct intel_wakeref *wf,
|
|
int (*fn)(struct intel_wakeref *wf))
|
|
{
|
|
/*
|
|
* Treat get/put as different subclasses, as we may need to run
|
|
* the put callback from under the shrinker and do not want to
|
|
* cross-contanimate that callback with any extra work performed
|
|
* upon acquiring the wakeref.
|
|
*/
|
|
mutex_lock_nested(&wf->mutex, SINGLE_DEPTH_NESTING);
|
|
if (!atomic_read(&wf->count)) {
|
|
int err;
|
|
|
|
rpm_get(rpm, wf);
|
|
|
|
err = fn(wf);
|
|
if (unlikely(err)) {
|
|
rpm_put(rpm, wf);
|
|
mutex_unlock(&wf->mutex);
|
|
return err;
|
|
}
|
|
|
|
smp_mb__before_atomic(); /* release wf->count */
|
|
}
|
|
atomic_inc(&wf->count);
|
|
mutex_unlock(&wf->mutex);
|
|
|
|
return 0;
|
|
}
|
|
|
|
int __intel_wakeref_put_last(struct intel_runtime_pm *rpm,
|
|
struct intel_wakeref *wf,
|
|
int (*fn)(struct intel_wakeref *wf))
|
|
{
|
|
int err;
|
|
|
|
err = fn(wf);
|
|
if (likely(!err))
|
|
rpm_put(rpm, wf);
|
|
else
|
|
atomic_inc(&wf->count);
|
|
mutex_unlock(&wf->mutex);
|
|
|
|
return err;
|
|
}
|
|
|
|
void __intel_wakeref_init(struct intel_wakeref *wf, struct lock_class_key *key)
|
|
{
|
|
__mutex_init(&wf->mutex, "wakeref", key);
|
|
atomic_set(&wf->count, 0);
|
|
wf->wakeref = 0;
|
|
}
|
|
|
|
static void wakeref_auto_timeout(struct timer_list *t)
|
|
{
|
|
struct intel_wakeref_auto *wf = from_timer(wf, t, timer);
|
|
intel_wakeref_t wakeref;
|
|
unsigned long flags;
|
|
|
|
if (!refcount_dec_and_lock_irqsave(&wf->count, &wf->lock, &flags))
|
|
return;
|
|
|
|
wakeref = fetch_and_zero(&wf->wakeref);
|
|
spin_unlock_irqrestore(&wf->lock, flags);
|
|
|
|
intel_runtime_pm_put(wf->rpm, wakeref);
|
|
}
|
|
|
|
void intel_wakeref_auto_init(struct intel_wakeref_auto *wf,
|
|
struct intel_runtime_pm *rpm)
|
|
{
|
|
spin_lock_init(&wf->lock);
|
|
timer_setup(&wf->timer, wakeref_auto_timeout, 0);
|
|
refcount_set(&wf->count, 0);
|
|
wf->wakeref = 0;
|
|
wf->rpm = rpm;
|
|
}
|
|
|
|
void intel_wakeref_auto(struct intel_wakeref_auto *wf, unsigned long timeout)
|
|
{
|
|
unsigned long flags;
|
|
|
|
if (!timeout) {
|
|
if (del_timer_sync(&wf->timer))
|
|
wakeref_auto_timeout(&wf->timer);
|
|
return;
|
|
}
|
|
|
|
/* Our mission is that we only extend an already active wakeref */
|
|
assert_rpm_wakelock_held(wf->rpm);
|
|
|
|
if (!refcount_inc_not_zero(&wf->count)) {
|
|
spin_lock_irqsave(&wf->lock, flags);
|
|
if (!refcount_inc_not_zero(&wf->count)) {
|
|
GEM_BUG_ON(wf->wakeref);
|
|
wf->wakeref = intel_runtime_pm_get_if_in_use(wf->rpm);
|
|
refcount_set(&wf->count, 1);
|
|
}
|
|
spin_unlock_irqrestore(&wf->lock, flags);
|
|
}
|
|
|
|
/*
|
|
* If we extend a pending timer, we will only get a single timer
|
|
* callback and so need to cancel the local inc by running the
|
|
* elided callback to keep the wf->count balanced.
|
|
*/
|
|
if (mod_timer(&wf->timer, jiffies + timeout))
|
|
wakeref_auto_timeout(&wf->timer);
|
|
}
|
|
|
|
void intel_wakeref_auto_fini(struct intel_wakeref_auto *wf)
|
|
{
|
|
intel_wakeref_auto(wf, 0);
|
|
GEM_BUG_ON(wf->wakeref);
|
|
}
|