mirror of https://gitee.com/openkylin/linux.git
525 lines
12 KiB
C
525 lines
12 KiB
C
/*
|
|
* (C) Copyright 2016 Intel Corporation
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* as published by the Free Software Foundation; version 2
|
|
* of the License.
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/dma-fence.h>
|
|
#include <linux/reservation.h>
|
|
|
|
#include "i915_sw_fence.h"
|
|
|
|
#define I915_SW_FENCE_FLAG_ALLOC BIT(3) /* after WQ_FLAG_* for safety */
|
|
|
|
static DEFINE_SPINLOCK(i915_sw_fence_lock);
|
|
|
|
enum {
|
|
DEBUG_FENCE_IDLE = 0,
|
|
DEBUG_FENCE_NOTIFY,
|
|
};
|
|
|
|
#ifdef CONFIG_DRM_I915_SW_FENCE_DEBUG_OBJECTS
|
|
|
|
static void *i915_sw_fence_debug_hint(void *addr)
|
|
{
|
|
return (void *)(((struct i915_sw_fence *)addr)->flags & I915_SW_FENCE_MASK);
|
|
}
|
|
|
|
static struct debug_obj_descr i915_sw_fence_debug_descr = {
|
|
.name = "i915_sw_fence",
|
|
.debug_hint = i915_sw_fence_debug_hint,
|
|
};
|
|
|
|
static inline void debug_fence_init(struct i915_sw_fence *fence)
|
|
{
|
|
debug_object_init(fence, &i915_sw_fence_debug_descr);
|
|
}
|
|
|
|
static inline void debug_fence_activate(struct i915_sw_fence *fence)
|
|
{
|
|
debug_object_activate(fence, &i915_sw_fence_debug_descr);
|
|
}
|
|
|
|
static inline void debug_fence_set_state(struct i915_sw_fence *fence,
|
|
int old, int new)
|
|
{
|
|
debug_object_active_state(fence, &i915_sw_fence_debug_descr, old, new);
|
|
}
|
|
|
|
static inline void debug_fence_deactivate(struct i915_sw_fence *fence)
|
|
{
|
|
debug_object_deactivate(fence, &i915_sw_fence_debug_descr);
|
|
}
|
|
|
|
static inline void debug_fence_destroy(struct i915_sw_fence *fence)
|
|
{
|
|
debug_object_destroy(fence, &i915_sw_fence_debug_descr);
|
|
}
|
|
|
|
static inline void debug_fence_free(struct i915_sw_fence *fence)
|
|
{
|
|
debug_object_free(fence, &i915_sw_fence_debug_descr);
|
|
}
|
|
|
|
static inline void debug_fence_assert(struct i915_sw_fence *fence)
|
|
{
|
|
debug_object_assert_init(fence, &i915_sw_fence_debug_descr);
|
|
}
|
|
|
|
#else
|
|
|
|
static inline void debug_fence_init(struct i915_sw_fence *fence)
|
|
{
|
|
}
|
|
|
|
static inline void debug_fence_activate(struct i915_sw_fence *fence)
|
|
{
|
|
}
|
|
|
|
static inline void debug_fence_set_state(struct i915_sw_fence *fence,
|
|
int old, int new)
|
|
{
|
|
}
|
|
|
|
static inline void debug_fence_deactivate(struct i915_sw_fence *fence)
|
|
{
|
|
}
|
|
|
|
static inline void debug_fence_destroy(struct i915_sw_fence *fence)
|
|
{
|
|
}
|
|
|
|
static inline void debug_fence_free(struct i915_sw_fence *fence)
|
|
{
|
|
}
|
|
|
|
static inline void debug_fence_assert(struct i915_sw_fence *fence)
|
|
{
|
|
}
|
|
|
|
#endif
|
|
|
|
static int __i915_sw_fence_notify(struct i915_sw_fence *fence,
|
|
enum i915_sw_fence_notify state)
|
|
{
|
|
i915_sw_fence_notify_t fn;
|
|
|
|
fn = (i915_sw_fence_notify_t)(fence->flags & I915_SW_FENCE_MASK);
|
|
return fn(fence, state);
|
|
}
|
|
|
|
#ifdef CONFIG_DRM_I915_SW_FENCE_DEBUG_OBJECTS
|
|
void i915_sw_fence_fini(struct i915_sw_fence *fence)
|
|
{
|
|
debug_fence_free(fence);
|
|
}
|
|
#endif
|
|
|
|
static void i915_sw_fence_release(struct kref *kref)
|
|
{
|
|
struct i915_sw_fence *fence = container_of(kref, typeof(*fence), kref);
|
|
|
|
WARN_ON(atomic_read(&fence->pending) > 0);
|
|
debug_fence_destroy(fence);
|
|
|
|
if (fence->flags & I915_SW_FENCE_MASK) {
|
|
__i915_sw_fence_notify(fence, FENCE_FREE);
|
|
} else {
|
|
i915_sw_fence_fini(fence);
|
|
kfree(fence);
|
|
}
|
|
}
|
|
|
|
static void i915_sw_fence_put(struct i915_sw_fence *fence)
|
|
{
|
|
debug_fence_assert(fence);
|
|
kref_put(&fence->kref, i915_sw_fence_release);
|
|
}
|
|
|
|
static struct i915_sw_fence *i915_sw_fence_get(struct i915_sw_fence *fence)
|
|
{
|
|
debug_fence_assert(fence);
|
|
kref_get(&fence->kref);
|
|
return fence;
|
|
}
|
|
|
|
static void __i915_sw_fence_wake_up_all(struct i915_sw_fence *fence,
|
|
struct list_head *continuation)
|
|
{
|
|
wait_queue_head_t *x = &fence->wait;
|
|
wait_queue_t *pos, *next;
|
|
unsigned long flags;
|
|
|
|
debug_fence_deactivate(fence);
|
|
atomic_set_release(&fence->pending, -1); /* 0 -> -1 [done] */
|
|
|
|
/*
|
|
* To prevent unbounded recursion as we traverse the graph of
|
|
* i915_sw_fences, we move the task_list from this, the next ready
|
|
* fence, to the tail of the original fence's task_list
|
|
* (and so added to the list to be woken).
|
|
*/
|
|
|
|
spin_lock_irqsave_nested(&x->lock, flags, 1 + !!continuation);
|
|
if (continuation) {
|
|
list_for_each_entry_safe(pos, next, &x->task_list, task_list) {
|
|
if (pos->func == autoremove_wake_function)
|
|
pos->func(pos, TASK_NORMAL, 0, continuation);
|
|
else
|
|
list_move_tail(&pos->task_list, continuation);
|
|
}
|
|
} else {
|
|
LIST_HEAD(extra);
|
|
|
|
do {
|
|
list_for_each_entry_safe(pos, next,
|
|
&x->task_list, task_list)
|
|
pos->func(pos, TASK_NORMAL, 0, &extra);
|
|
|
|
if (list_empty(&extra))
|
|
break;
|
|
|
|
list_splice_tail_init(&extra, &x->task_list);
|
|
} while (1);
|
|
}
|
|
spin_unlock_irqrestore(&x->lock, flags);
|
|
|
|
debug_fence_assert(fence);
|
|
}
|
|
|
|
static void __i915_sw_fence_complete(struct i915_sw_fence *fence,
|
|
struct list_head *continuation)
|
|
{
|
|
debug_fence_assert(fence);
|
|
|
|
if (!atomic_dec_and_test(&fence->pending))
|
|
return;
|
|
|
|
debug_fence_set_state(fence, DEBUG_FENCE_IDLE, DEBUG_FENCE_NOTIFY);
|
|
|
|
if (fence->flags & I915_SW_FENCE_MASK &&
|
|
__i915_sw_fence_notify(fence, FENCE_COMPLETE) != NOTIFY_DONE)
|
|
return;
|
|
|
|
debug_fence_set_state(fence, DEBUG_FENCE_NOTIFY, DEBUG_FENCE_IDLE);
|
|
|
|
__i915_sw_fence_wake_up_all(fence, continuation);
|
|
}
|
|
|
|
static void i915_sw_fence_complete(struct i915_sw_fence *fence)
|
|
{
|
|
debug_fence_assert(fence);
|
|
|
|
if (WARN_ON(i915_sw_fence_done(fence)))
|
|
return;
|
|
|
|
__i915_sw_fence_complete(fence, NULL);
|
|
}
|
|
|
|
static void i915_sw_fence_await(struct i915_sw_fence *fence)
|
|
{
|
|
debug_fence_assert(fence);
|
|
WARN_ON(atomic_inc_return(&fence->pending) <= 1);
|
|
}
|
|
|
|
void __i915_sw_fence_init(struct i915_sw_fence *fence,
|
|
i915_sw_fence_notify_t fn,
|
|
const char *name,
|
|
struct lock_class_key *key)
|
|
{
|
|
BUG_ON((unsigned long)fn & ~I915_SW_FENCE_MASK);
|
|
|
|
debug_fence_init(fence);
|
|
|
|
__init_waitqueue_head(&fence->wait, name, key);
|
|
kref_init(&fence->kref);
|
|
atomic_set(&fence->pending, 1);
|
|
fence->flags = (unsigned long)fn;
|
|
}
|
|
|
|
static void __i915_sw_fence_commit(struct i915_sw_fence *fence)
|
|
{
|
|
i915_sw_fence_complete(fence);
|
|
i915_sw_fence_put(fence);
|
|
}
|
|
|
|
void i915_sw_fence_commit(struct i915_sw_fence *fence)
|
|
{
|
|
debug_fence_activate(fence);
|
|
__i915_sw_fence_commit(fence);
|
|
}
|
|
|
|
static int i915_sw_fence_wake(wait_queue_t *wq, unsigned mode, int flags, void *key)
|
|
{
|
|
list_del(&wq->task_list);
|
|
__i915_sw_fence_complete(wq->private, key);
|
|
i915_sw_fence_put(wq->private);
|
|
if (wq->flags & I915_SW_FENCE_FLAG_ALLOC)
|
|
kfree(wq);
|
|
return 0;
|
|
}
|
|
|
|
static bool __i915_sw_fence_check_if_after(struct i915_sw_fence *fence,
|
|
const struct i915_sw_fence * const signaler)
|
|
{
|
|
wait_queue_t *wq;
|
|
|
|
if (__test_and_set_bit(I915_SW_FENCE_CHECKED_BIT, &fence->flags))
|
|
return false;
|
|
|
|
if (fence == signaler)
|
|
return true;
|
|
|
|
list_for_each_entry(wq, &fence->wait.task_list, task_list) {
|
|
if (wq->func != i915_sw_fence_wake)
|
|
continue;
|
|
|
|
if (__i915_sw_fence_check_if_after(wq->private, signaler))
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static void __i915_sw_fence_clear_checked_bit(struct i915_sw_fence *fence)
|
|
{
|
|
wait_queue_t *wq;
|
|
|
|
if (!__test_and_clear_bit(I915_SW_FENCE_CHECKED_BIT, &fence->flags))
|
|
return;
|
|
|
|
list_for_each_entry(wq, &fence->wait.task_list, task_list) {
|
|
if (wq->func != i915_sw_fence_wake)
|
|
continue;
|
|
|
|
__i915_sw_fence_clear_checked_bit(wq->private);
|
|
}
|
|
}
|
|
|
|
static bool i915_sw_fence_check_if_after(struct i915_sw_fence *fence,
|
|
const struct i915_sw_fence * const signaler)
|
|
{
|
|
unsigned long flags;
|
|
bool err;
|
|
|
|
if (!IS_ENABLED(CONFIG_I915_SW_FENCE_CHECK_DAG))
|
|
return false;
|
|
|
|
spin_lock_irqsave(&i915_sw_fence_lock, flags);
|
|
err = __i915_sw_fence_check_if_after(fence, signaler);
|
|
__i915_sw_fence_clear_checked_bit(fence);
|
|
spin_unlock_irqrestore(&i915_sw_fence_lock, flags);
|
|
|
|
return err;
|
|
}
|
|
|
|
static int __i915_sw_fence_await_sw_fence(struct i915_sw_fence *fence,
|
|
struct i915_sw_fence *signaler,
|
|
wait_queue_t *wq, gfp_t gfp)
|
|
{
|
|
unsigned long flags;
|
|
int pending;
|
|
|
|
debug_fence_assert(fence);
|
|
|
|
if (i915_sw_fence_done(signaler))
|
|
return 0;
|
|
|
|
debug_fence_assert(signaler);
|
|
|
|
/* The dependency graph must be acyclic. */
|
|
if (unlikely(i915_sw_fence_check_if_after(fence, signaler)))
|
|
return -EINVAL;
|
|
|
|
pending = 0;
|
|
if (!wq) {
|
|
wq = kmalloc(sizeof(*wq), gfp);
|
|
if (!wq) {
|
|
if (!gfpflags_allow_blocking(gfp))
|
|
return -ENOMEM;
|
|
|
|
i915_sw_fence_wait(signaler);
|
|
return 0;
|
|
}
|
|
|
|
pending |= I915_SW_FENCE_FLAG_ALLOC;
|
|
}
|
|
|
|
INIT_LIST_HEAD(&wq->task_list);
|
|
wq->flags = pending;
|
|
wq->func = i915_sw_fence_wake;
|
|
wq->private = i915_sw_fence_get(fence);
|
|
|
|
i915_sw_fence_await(fence);
|
|
|
|
spin_lock_irqsave(&signaler->wait.lock, flags);
|
|
if (likely(!i915_sw_fence_done(signaler))) {
|
|
__add_wait_queue_tail(&signaler->wait, wq);
|
|
pending = 1;
|
|
} else {
|
|
i915_sw_fence_wake(wq, 0, 0, NULL);
|
|
pending = 0;
|
|
}
|
|
spin_unlock_irqrestore(&signaler->wait.lock, flags);
|
|
|
|
return pending;
|
|
}
|
|
|
|
int i915_sw_fence_await_sw_fence(struct i915_sw_fence *fence,
|
|
struct i915_sw_fence *signaler,
|
|
wait_queue_t *wq)
|
|
{
|
|
return __i915_sw_fence_await_sw_fence(fence, signaler, wq, 0);
|
|
}
|
|
|
|
int i915_sw_fence_await_sw_fence_gfp(struct i915_sw_fence *fence,
|
|
struct i915_sw_fence *signaler,
|
|
gfp_t gfp)
|
|
{
|
|
return __i915_sw_fence_await_sw_fence(fence, signaler, NULL, gfp);
|
|
}
|
|
|
|
struct i915_sw_dma_fence_cb {
|
|
struct dma_fence_cb base;
|
|
struct i915_sw_fence *fence;
|
|
struct dma_fence *dma;
|
|
struct timer_list timer;
|
|
};
|
|
|
|
static void timer_i915_sw_fence_wake(unsigned long data)
|
|
{
|
|
struct i915_sw_dma_fence_cb *cb = (struct i915_sw_dma_fence_cb *)data;
|
|
|
|
printk(KERN_WARNING "asynchronous wait on fence %s:%s:%x timed out\n",
|
|
cb->dma->ops->get_driver_name(cb->dma),
|
|
cb->dma->ops->get_timeline_name(cb->dma),
|
|
cb->dma->seqno);
|
|
dma_fence_put(cb->dma);
|
|
cb->dma = NULL;
|
|
|
|
__i915_sw_fence_commit(cb->fence);
|
|
cb->timer.function = NULL;
|
|
}
|
|
|
|
static void dma_i915_sw_fence_wake(struct dma_fence *dma,
|
|
struct dma_fence_cb *data)
|
|
{
|
|
struct i915_sw_dma_fence_cb *cb = container_of(data, typeof(*cb), base);
|
|
|
|
del_timer_sync(&cb->timer);
|
|
if (cb->timer.function)
|
|
__i915_sw_fence_commit(cb->fence);
|
|
dma_fence_put(cb->dma);
|
|
|
|
kfree(cb);
|
|
}
|
|
|
|
int i915_sw_fence_await_dma_fence(struct i915_sw_fence *fence,
|
|
struct dma_fence *dma,
|
|
unsigned long timeout,
|
|
gfp_t gfp)
|
|
{
|
|
struct i915_sw_dma_fence_cb *cb;
|
|
int ret;
|
|
|
|
debug_fence_assert(fence);
|
|
|
|
if (dma_fence_is_signaled(dma))
|
|
return 0;
|
|
|
|
cb = kmalloc(sizeof(*cb), gfp);
|
|
if (!cb) {
|
|
if (!gfpflags_allow_blocking(gfp))
|
|
return -ENOMEM;
|
|
|
|
return dma_fence_wait(dma, false);
|
|
}
|
|
|
|
cb->fence = i915_sw_fence_get(fence);
|
|
i915_sw_fence_await(fence);
|
|
|
|
cb->dma = NULL;
|
|
__setup_timer(&cb->timer,
|
|
timer_i915_sw_fence_wake, (unsigned long)cb,
|
|
TIMER_IRQSAFE);
|
|
if (timeout) {
|
|
cb->dma = dma_fence_get(dma);
|
|
mod_timer(&cb->timer, round_jiffies_up(jiffies + timeout));
|
|
}
|
|
|
|
ret = dma_fence_add_callback(dma, &cb->base, dma_i915_sw_fence_wake);
|
|
if (ret == 0) {
|
|
ret = 1;
|
|
} else {
|
|
dma_i915_sw_fence_wake(dma, &cb->base);
|
|
if (ret == -ENOENT) /* fence already signaled */
|
|
ret = 0;
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
int i915_sw_fence_await_reservation(struct i915_sw_fence *fence,
|
|
struct reservation_object *resv,
|
|
const struct dma_fence_ops *exclude,
|
|
bool write,
|
|
unsigned long timeout,
|
|
gfp_t gfp)
|
|
{
|
|
struct dma_fence *excl;
|
|
int ret = 0, pending;
|
|
|
|
debug_fence_assert(fence);
|
|
|
|
if (write) {
|
|
struct dma_fence **shared;
|
|
unsigned int count, i;
|
|
|
|
ret = reservation_object_get_fences_rcu(resv,
|
|
&excl, &count, &shared);
|
|
if (ret)
|
|
return ret;
|
|
|
|
for (i = 0; i < count; i++) {
|
|
if (shared[i]->ops == exclude)
|
|
continue;
|
|
|
|
pending = i915_sw_fence_await_dma_fence(fence,
|
|
shared[i],
|
|
timeout,
|
|
gfp);
|
|
if (pending < 0) {
|
|
ret = pending;
|
|
break;
|
|
}
|
|
|
|
ret |= pending;
|
|
}
|
|
|
|
for (i = 0; i < count; i++)
|
|
dma_fence_put(shared[i]);
|
|
kfree(shared);
|
|
} else {
|
|
excl = reservation_object_get_excl_rcu(resv);
|
|
}
|
|
|
|
if (ret >= 0 && excl && excl->ops != exclude) {
|
|
pending = i915_sw_fence_await_dma_fence(fence,
|
|
excl,
|
|
timeout,
|
|
gfp);
|
|
if (pending < 0)
|
|
ret = pending;
|
|
else
|
|
ret |= pending;
|
|
}
|
|
|
|
dma_fence_put(excl);
|
|
|
|
return ret;
|
|
}
|