blob: d1a382dfaa1dfc6fec971e12118ea2f7401523c3 [file] [log] [blame]
// SPDX-License-Identifier: MIT
/*
* Copyright © 2019 Intel Corporation
*/
#include <linux/workqueue.h>
#include "i915_drv.h" /* for_each_engine() */
#include "i915_request.h"
#include "intel_engine_heartbeat.h"
#include "intel_execlists_submission.h"
#include "intel_gt.h"
#include "intel_gt_pm.h"
#include "intel_gt_requests.h"
#include "intel_timeline.h"
static bool retire_requests(struct intel_timeline *tl)
{
struct i915_request *rq, *rn;
list_for_each_entry_safe(rq, rn, &tl->requests, link)
if (!i915_request_retire(rq))
return false;
/* And check nothing new was submitted */
return !i915_active_fence_isset(&tl->last_request);
}
static bool engine_active(const struct intel_engine_cs *engine)
{
return !list_empty(&engine->kernel_context->timeline->requests);
}
static bool flush_submission(struct intel_gt *gt, long timeout)
{
struct intel_engine_cs *engine;
enum intel_engine_id id;
bool active = false;
if (!timeout)
return false;
if (!intel_gt_pm_is_awake(gt))
return false;
for_each_engine(engine, gt, id) {
intel_engine_flush_submission(engine);
/* Flush the background retirement and idle barriers */
flush_work(&engine->retire_work);
flush_delayed_work(&engine->wakeref.work);
/* Is the idle barrier still outstanding? */
active |= engine_active(engine);
}
return active;
}
static void engine_retire(struct work_struct *work)
{
struct intel_engine_cs *engine =
container_of(work, typeof(*engine), retire_work);
struct intel_timeline *tl = xchg(&engine->retire, NULL);
do {
struct intel_timeline *next = xchg(&tl->retire, NULL);
/*
* Our goal here is to retire _idle_ timelines as soon as
* possible (as they are idle, we do not expect userspace
* to be cleaning up anytime soon).
*
* If the timeline is currently locked, either it is being
* retired elsewhere or about to be!
*/
if (mutex_trylock(&tl->mutex)) {
retire_requests(tl);
mutex_unlock(&tl->mutex);
}
intel_timeline_put(tl);
GEM_BUG_ON(!next);
tl = ptr_mask_bits(next, 1);
} while (tl);
}
static bool add_retire(struct intel_engine_cs *engine,
struct intel_timeline *tl)
{
#define STUB ((struct intel_timeline *)1)
struct intel_timeline *first;
/*
* We open-code a llist here to include the additional tag [BIT(0)]
* so that we know when the timeline is already on a
* retirement queue: either this engine or another.
*/
if (cmpxchg(&tl->retire, NULL, STUB)) /* already queued */
return false;
intel_timeline_get(tl);
first = READ_ONCE(engine->retire);
do
tl->retire = ptr_pack_bits(first, 1, 1);
while (!try_cmpxchg(&engine->retire, &first, tl));
return !first;
}
void intel_engine_add_retire(struct intel_engine_cs *engine,
struct intel_timeline *tl)
{
/* We don't deal well with the engine disappearing beneath us */
GEM_BUG_ON(intel_engine_is_virtual(engine));
if (add_retire(engine, tl))
queue_work(engine->i915->unordered_wq, &engine->retire_work);
}
void intel_engine_init_retire(struct intel_engine_cs *engine)
{
INIT_WORK(&engine->retire_work, engine_retire);
}
void intel_engine_fini_retire(struct intel_engine_cs *engine)
{
flush_work(&engine->retire_work);
GEM_BUG_ON(engine->retire);
}
long intel_gt_retire_requests_timeout(struct intel_gt *gt, long timeout,
long *remaining_timeout)
{
struct intel_gt_timelines *timelines = &gt->timelines;
struct intel_timeline *tl, *tn;
unsigned long active_count = 0;
LIST_HEAD(free);
flush_submission(gt, timeout); /* kick the ksoftirqd tasklets */
spin_lock(&timelines->lock);
list_for_each_entry_safe(tl, tn, &timelines->active_list, link) {
if (!mutex_trylock(&tl->mutex)) {
active_count++; /* report busy to caller, try again? */
continue;
}
intel_timeline_get(tl);
GEM_BUG_ON(!atomic_read(&tl->active_count));
atomic_inc(&tl->active_count); /* pin the list element */
spin_unlock(&timelines->lock);
if (timeout > 0) {
struct dma_fence *fence;
fence = i915_active_fence_get(&tl->last_request);
if (fence) {
mutex_unlock(&tl->mutex);
timeout = dma_fence_wait_timeout(fence,
true,
timeout);
dma_fence_put(fence);
/* Retirement is best effort */
if (!mutex_trylock(&tl->mutex)) {
active_count++;
goto out_active;
}
}
}
if (!retire_requests(tl))
active_count++;
mutex_unlock(&tl->mutex);
out_active: spin_lock(&timelines->lock);
/* Resume list iteration after reacquiring spinlock */
list_safe_reset_next(tl, tn, link);
if (atomic_dec_and_test(&tl->active_count))
list_del(&tl->link);
/* Defer the final release to after the spinlock */
if (refcount_dec_and_test(&tl->kref.refcount)) {
GEM_BUG_ON(atomic_read(&tl->active_count));
list_add(&tl->link, &free);
}
}
spin_unlock(&timelines->lock);
list_for_each_entry_safe(tl, tn, &free, link)
__intel_timeline_free(&tl->kref);
if (flush_submission(gt, timeout)) /* Wait, there's more! */
active_count++;
if (remaining_timeout)
*remaining_timeout = timeout;
return active_count ? timeout ?: -ETIME : 0;
}
static void retire_work_handler(struct work_struct *work)
{
struct intel_gt *gt =
container_of(work, typeof(*gt), requests.retire_work.work);
queue_delayed_work(gt->i915->unordered_wq, &gt->requests.retire_work,
round_jiffies_up_relative(HZ));
intel_gt_retire_requests(gt);
}
void intel_gt_init_requests(struct intel_gt *gt)
{
INIT_DELAYED_WORK(&gt->requests.retire_work, retire_work_handler);
}
void intel_gt_park_requests(struct intel_gt *gt)
{
cancel_delayed_work(&gt->requests.retire_work);
}
void intel_gt_unpark_requests(struct intel_gt *gt)
{
queue_delayed_work(gt->i915->unordered_wq, &gt->requests.retire_work,
round_jiffies_up_relative(HZ));
}
void intel_gt_fini_requests(struct intel_gt *gt)
{
/* Wait until the work is marked as finished before unloading! */
cancel_delayed_work_sync(&gt->requests.retire_work);
flush_work(&gt->watchdog.work);
}
void intel_gt_watchdog_work(struct work_struct *work)
{
struct intel_gt *gt =
container_of(work, typeof(*gt), watchdog.work);
struct i915_request *rq, *rn;
struct llist_node *first;
first = llist_del_all(&gt->watchdog.list);
if (!first)
return;
llist_for_each_entry_safe(rq, rn, first, watchdog.link) {
if (!i915_request_completed(rq)) {
struct dma_fence *f = &rq->fence;
pr_notice("Fence expiration time out i915-%s:%s:%llx!\n",
f->ops->get_driver_name(f),
f->ops->get_timeline_name(f),
f->seqno);
i915_request_cancel(rq, -EINTR);
}
i915_request_put(rq);
}
}