mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-25 12:42:17 +07:00
b27e35ae5b
Do not allow runtime pm autosuspend to remove userspace GGTT mmaps too quickly. For example, igt sets the autosuspend delay to 0, and so we immediately attempt to perform runtime suspend upon releasing the wakeref. Unfortunately, that involves tearing down GGTT mmaps as they require an active device. Override the autosuspend for GGTT mmaps, by keeping the wakeref around for 250ms after populating the PTE for a fresh mmap. v2: Prefer refcount_t for its under/overflow error detection v3: Flush the user runtime autosuspend prior to system system. Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Cc: Mika Kuoppala <mika.kuoppala@linux.intel.com> Reviewed-by: Mika Kuoppala <mika.kuoppala@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20190527115114.13448-1-chris@chris-wilson.co.uk
139 lines
3.2 KiB
C
139 lines
3.2 KiB
C
/*
|
|
* SPDX-License-Identifier: MIT
|
|
*
|
|
* Copyright © 2019 Intel Corporation
|
|
*/
|
|
|
|
#include "intel_drv.h"
|
|
#include "intel_wakeref.h"
|
|
|
|
static void rpm_get(struct drm_i915_private *i915, struct intel_wakeref *wf)
|
|
{
|
|
wf->wakeref = intel_runtime_pm_get(i915);
|
|
}
|
|
|
|
static void rpm_put(struct drm_i915_private *i915, struct intel_wakeref *wf)
|
|
{
|
|
intel_wakeref_t wakeref = fetch_and_zero(&wf->wakeref);
|
|
|
|
intel_runtime_pm_put(i915, wakeref);
|
|
GEM_BUG_ON(!wakeref);
|
|
}
|
|
|
|
int __intel_wakeref_get_first(struct drm_i915_private *i915,
|
|
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(i915, wf);
|
|
|
|
err = fn(wf);
|
|
if (unlikely(err)) {
|
|
rpm_put(i915, 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 drm_i915_private *i915,
|
|
struct intel_wakeref *wf,
|
|
int (*fn)(struct intel_wakeref *wf))
|
|
{
|
|
int err;
|
|
|
|
err = fn(wf);
|
|
if (likely(!err))
|
|
rpm_put(i915, 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->i915, wakeref);
|
|
}
|
|
|
|
void intel_wakeref_auto_init(struct intel_wakeref_auto *wf,
|
|
struct drm_i915_private *i915)
|
|
{
|
|
spin_lock_init(&wf->lock);
|
|
timer_setup(&wf->timer, wakeref_auto_timeout, 0);
|
|
refcount_set(&wf->count, 0);
|
|
wf->wakeref = 0;
|
|
wf->i915 = i915;
|
|
}
|
|
|
|
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->i915);
|
|
|
|
if (!refcount_inc_not_zero(&wf->count)) {
|
|
spin_lock_irqsave(&wf->lock, flags);
|
|
if (!refcount_read(&wf->count)) {
|
|
GEM_BUG_ON(wf->wakeref);
|
|
wf->wakeref = intel_runtime_pm_get_if_in_use(wf->i915);
|
|
}
|
|
refcount_inc(&wf->count);
|
|
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);
|
|
}
|