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/*
* SPDX-License-Identifier: MIT
*
* Copyright © 2019 Intel Corporation
*/
#include "gem/i915_gem_pm.h"
#include "gt/intel_gt_pm.h"
#include "i915_drv.h"
#include "i915_globals.h"
static void i915_gem_park(struct drm_i915_private *i915)
{
struct intel_engine_cs *engine;
enum intel_engine_id id;
lockdep_assert_held(&i915->drm.struct_mutex);
for_each_engine(engine, i915, id)
i915_gem_batch_pool_fini(&engine->batch_pool);
i915_timelines_park(i915);
i915_vma_parked(i915);
i915_globals_park();
}
static void idle_work_handler(struct work_struct *work)
{
struct drm_i915_private *i915 =
container_of(work, typeof(*i915), gem.idle_work);
bool restart = true;
cancel_delayed_work(&i915->gem.retire_work);
mutex_lock(&i915->drm.struct_mutex);
intel_wakeref_lock(&i915->gt.wakeref);
if (!intel_wakeref_active(&i915->gt.wakeref) && !work_pending(work)) {
i915_gem_park(i915);
restart = false;
}
intel_wakeref_unlock(&i915->gt.wakeref);
mutex_unlock(&i915->drm.struct_mutex);
if (restart)
queue_delayed_work(i915->wq,
&i915->gem.retire_work,
round_jiffies_up_relative(HZ));
}
static void retire_work_handler(struct work_struct *work)
{
struct drm_i915_private *i915 =
container_of(work, typeof(*i915), gem.retire_work.work);
/* Come back later if the device is busy... */
if (mutex_trylock(&i915->drm.struct_mutex)) {
i915_retire_requests(i915);
mutex_unlock(&i915->drm.struct_mutex);
}
queue_delayed_work(i915->wq,
&i915->gem.retire_work,
round_jiffies_up_relative(HZ));
}
static int pm_notifier(struct notifier_block *nb,
unsigned long action,
void *data)
{
struct drm_i915_private *i915 =
container_of(nb, typeof(*i915), gem.pm_notifier);
switch (action) {
case INTEL_GT_UNPARK:
i915_globals_unpark();
queue_delayed_work(i915->wq,
&i915->gem.retire_work,
round_jiffies_up_relative(HZ));
break;
case INTEL_GT_PARK:
queue_work(i915->wq, &i915->gem.idle_work);
break;
}
return NOTIFY_OK;
}
static bool switch_to_kernel_context_sync(struct drm_i915_private *i915)
{
bool result = true;
do {
if (i915_gem_wait_for_idle(i915,
I915_WAIT_LOCKED |
I915_WAIT_FOR_IDLE_BOOST,
I915_GEM_IDLE_TIMEOUT) == -ETIME) {
/* XXX hide warning from gem_eio */
if (i915_modparams.reset) {
dev_err(i915->drm.dev,
"Failed to idle engines, declaring wedged!\n");
GEM_TRACE_DUMP();
}
/*
* Forcibly cancel outstanding work and leave
* the gpu quiet.
*/
i915_gem_set_wedged(i915);
result = false;
}
} while (i915_retire_requests(i915) && result);
GEM_BUG_ON(i915->gt.awake);
return result;
}
bool i915_gem_load_power_context(struct drm_i915_private *i915)
{
return switch_to_kernel_context_sync(i915);
}
void i915_gem_suspend(struct drm_i915_private *i915)
{
GEM_TRACE("\n");
intel_wakeref_auto(&i915->mm.userfault_wakeref, 0);
flush_workqueue(i915->wq);
mutex_lock(&i915->drm.struct_mutex);
/*
* We have to flush all the executing contexts to main memory so
* that they can saved in the hibernation image. To ensure the last
* context image is coherent, we have to switch away from it. That
* leaves the i915->kernel_context still active when
* we actually suspend, and its image in memory may not match the GPU
* state. Fortunately, the kernel_context is disposable and we do
* not rely on its state.
*/
switch_to_kernel_context_sync(i915);
mutex_unlock(&i915->drm.struct_mutex);
/*
* Assert that we successfully flushed all the work and
* reset the GPU back to its idle, low power state.
*/
GEM_BUG_ON(i915->gt.awake);
flush_work(&i915->gem.idle_work);
cancel_delayed_work_sync(&i915->gpu_error.hangcheck_work);
i915_gem_drain_freed_objects(i915);
intel_uc_suspend(i915);
}
void i915_gem_suspend_late(struct drm_i915_private *i915)
{
struct drm_i915_gem_object *obj;
struct list_head *phases[] = {
&i915->mm.unbound_list,
&i915->mm.bound_list,
&i915->mm.purge_list,
NULL
}, **phase;
/*
* Neither the BIOS, ourselves or any other kernel
* expects the system to be in execlists mode on startup,
* so we need to reset the GPU back to legacy mode. And the only
* known way to disable logical contexts is through a GPU reset.
*
* So in order to leave the system in a known default configuration,
* always reset the GPU upon unload and suspend. Afterwards we then
* clean up the GEM state tracking, flushing off the requests and
* leaving the system in a known idle state.
*
* Note that is of the upmost importance that the GPU is idle and
* all stray writes are flushed *before* we dismantle the backing
* storage for the pinned objects.
*
* However, since we are uncertain that resetting the GPU on older
* machines is a good idea, we don't - just in case it leaves the
* machine in an unusable condition.
*/
for (phase = phases; *phase; phase++) {
list_for_each_entry(obj, *phase, mm.link) {
i915_gem_object_lock(obj);
WARN_ON(i915_gem_object_set_to_gtt_domain(obj, false));
i915_gem_object_unlock(obj);
}
}
intel_uc_sanitize(i915);
i915_gem_sanitize(i915);
}
void i915_gem_resume(struct drm_i915_private *i915)
{
GEM_TRACE("\n");
WARN_ON(i915->gt.awake);
mutex_lock(&i915->drm.struct_mutex);
intel_uncore_forcewake_get(&i915->uncore, FORCEWAKE_ALL);
i915_gem_restore_gtt_mappings(i915);
i915_gem_restore_fences(i915);
/*
* As we didn't flush the kernel context before suspend, we cannot
* guarantee that the context image is complete. So let's just reset
* it and start again.
*/
intel_gt_resume(i915);
if (i915_gem_init_hw(i915))
goto err_wedged;
intel_uc_resume(i915);
/* Always reload a context for powersaving. */
if (!i915_gem_load_power_context(i915))
goto err_wedged;
out_unlock:
intel_uncore_forcewake_put(&i915->uncore, FORCEWAKE_ALL);
mutex_unlock(&i915->drm.struct_mutex);
return;
err_wedged:
if (!i915_reset_failed(i915)) {
dev_err(i915->drm.dev,
"Failed to re-initialize GPU, declaring it wedged!\n");
i915_gem_set_wedged(i915);
}
goto out_unlock;
}
void i915_gem_init__pm(struct drm_i915_private *i915)
{
INIT_WORK(&i915->gem.idle_work, idle_work_handler);
INIT_DELAYED_WORK(&i915->gem.retire_work, retire_work_handler);
i915->gem.pm_notifier.notifier_call = pm_notifier;
blocking_notifier_chain_register(&i915->gt.pm_notifications,
&i915->gem.pm_notifier);
}
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