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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-11 08:27:49 +0000 |
commit | ace9429bb58fd418f0c81d4c2835699bddf6bde6 (patch) | |
tree | b2d64bc10158fdd5497876388cd68142ca374ed3 /drivers/gpu/drm/i915/i915_sw_fence.c | |
parent | Initial commit. (diff) | |
download | linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.tar.xz linux-ace9429bb58fd418f0c81d4c2835699bddf6bde6.zip |
Adding upstream version 6.6.15.upstream/6.6.15
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'drivers/gpu/drm/i915/i915_sw_fence.c')
-rw-r--r-- | drivers/gpu/drm/i915/i915_sw_fence.c | 603 |
1 files changed, 603 insertions, 0 deletions
diff --git a/drivers/gpu/drm/i915/i915_sw_fence.c b/drivers/gpu/drm/i915/i915_sw_fence.c new file mode 100644 index 0000000000..8a9aad523e --- /dev/null +++ b/drivers/gpu/drm/i915/i915_sw_fence.c @@ -0,0 +1,603 @@ +/* + * SPDX-License-Identifier: MIT + * + * (C) Copyright 2016 Intel Corporation + */ + +#include <linux/slab.h> +#include <linux/dma-fence.h> +#include <linux/irq_work.h> +#include <linux/dma-resv.h> + +#include "i915_sw_fence.h" +#include "i915_selftest.h" + +#if IS_ENABLED(CONFIG_DRM_I915_DEBUG) +#define I915_SW_FENCE_BUG_ON(expr) BUG_ON(expr) +#else +#define I915_SW_FENCE_BUG_ON(expr) BUILD_BUG_ON_INVALID(expr) +#endif + +#ifdef CONFIG_DRM_I915_SW_FENCE_CHECK_DAG +static DEFINE_SPINLOCK(i915_sw_fence_lock); +#endif + +#define WQ_FLAG_BITS \ + BITS_PER_TYPE(typeof_member(struct wait_queue_entry, flags)) + +/* after WQ_FLAG_* for safety */ +#define I915_SW_FENCE_FLAG_FENCE BIT(WQ_FLAG_BITS - 1) +#define I915_SW_FENCE_FLAG_ALLOC BIT(WQ_FLAG_BITS - 2) + +enum { + DEBUG_FENCE_IDLE = 0, + DEBUG_FENCE_NOTIFY, +}; + +static void *i915_sw_fence_debug_hint(void *addr) +{ + return (void *)(((struct i915_sw_fence *)addr)->fn); +} + +#ifdef CONFIG_DRM_I915_SW_FENCE_DEBUG_OBJECTS + +static const 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_init_onstack(struct i915_sw_fence *fence) +{ + debug_object_init_on_stack(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); + smp_wmb(); /* flush the change in state before reallocation */ +} + +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_init_onstack(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) +{ + return fence->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_wake_up_all(struct i915_sw_fence *fence, + struct list_head *continuation) +{ + wait_queue_head_t *x = &fence->wait; + wait_queue_entry_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 entry list from this, the next ready + * fence, to the tail of the original fence's entry 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->head, entry) { + if (pos->flags & I915_SW_FENCE_FLAG_FENCE) + list_move_tail(&pos->entry, continuation); + else + pos->func(pos, TASK_NORMAL, 0, continuation); + } + } else { + LIST_HEAD(extra); + + do { + list_for_each_entry_safe(pos, next, &x->head, entry) { + int wake_flags; + + wake_flags = 0; + if (pos->flags & I915_SW_FENCE_FLAG_FENCE) + wake_flags = fence->error; + + pos->func(pos, TASK_NORMAL, wake_flags, &extra); + } + + if (list_empty(&extra)) + break; + + list_splice_tail_init(&extra, &x->head); + } 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 (__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); + + debug_fence_destroy(fence); + __i915_sw_fence_notify(fence, FENCE_FREE); +} + +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); +} + +bool i915_sw_fence_await(struct i915_sw_fence *fence) +{ + int pending; + + /* + * It is only safe to add a new await to the fence while it has + * not yet been signaled (i.e. there are still existing signalers). + */ + pending = atomic_read(&fence->pending); + do { + if (pending < 1) + return false; + } while (!atomic_try_cmpxchg(&fence->pending, &pending, pending + 1)); + + return true; +} + +void __i915_sw_fence_init(struct i915_sw_fence *fence, + i915_sw_fence_notify_t fn, + const char *name, + struct lock_class_key *key) +{ + __init_waitqueue_head(&fence->wait, name, key); + fence->fn = fn; +#ifdef CONFIG_DRM_I915_SW_FENCE_CHECK_DAG + fence->flags = 0; +#endif + + i915_sw_fence_reinit(fence); +} + +void i915_sw_fence_reinit(struct i915_sw_fence *fence) +{ + debug_fence_init(fence); + + atomic_set(&fence->pending, 1); + fence->error = 0; + + I915_SW_FENCE_BUG_ON(!list_empty(&fence->wait.head)); +} + +void i915_sw_fence_commit(struct i915_sw_fence *fence) +{ + debug_fence_activate(fence); + i915_sw_fence_complete(fence); +} + +static int i915_sw_fence_wake(wait_queue_entry_t *wq, unsigned mode, int flags, void *key) +{ + i915_sw_fence_set_error_once(wq->private, flags); + + list_del(&wq->entry); + __i915_sw_fence_complete(wq->private, key); + + if (wq->flags & I915_SW_FENCE_FLAG_ALLOC) + kfree(wq); + return 0; +} + +#ifdef CONFIG_DRM_I915_SW_FENCE_CHECK_DAG +static bool __i915_sw_fence_check_if_after(struct i915_sw_fence *fence, + const struct i915_sw_fence * const signaler) +{ + wait_queue_entry_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.head, entry) { + 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_entry_t *wq; + + if (!__test_and_clear_bit(I915_SW_FENCE_CHECKED_BIT, &fence->flags)) + return; + + list_for_each_entry(wq, &fence->wait.head, entry) { + 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; + + 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; +} +#else +static bool i915_sw_fence_check_if_after(struct i915_sw_fence *fence, + const struct i915_sw_fence * const signaler) +{ + return false; +} +#endif + +static int __i915_sw_fence_await_sw_fence(struct i915_sw_fence *fence, + struct i915_sw_fence *signaler, + wait_queue_entry_t *wq, gfp_t gfp) +{ + unsigned int pending; + unsigned long flags; + + debug_fence_assert(fence); + might_sleep_if(gfpflags_allow_blocking(gfp)); + + if (i915_sw_fence_done(signaler)) { + i915_sw_fence_set_error_once(fence, signaler->error); + 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 = I915_SW_FENCE_FLAG_FENCE; + if (!wq) { + wq = kmalloc(sizeof(*wq), gfp); + if (!wq) { + if (!gfpflags_allow_blocking(gfp)) + return -ENOMEM; + + i915_sw_fence_wait(signaler); + i915_sw_fence_set_error_once(fence, signaler->error); + return 0; + } + + pending |= I915_SW_FENCE_FLAG_ALLOC; + } + + INIT_LIST_HEAD(&wq->entry); + wq->flags = pending; + wq->func = i915_sw_fence_wake; + wq->private = fence; + + i915_sw_fence_await(fence); + + spin_lock_irqsave(&signaler->wait.lock, flags); + if (likely(!i915_sw_fence_done(signaler))) { + __add_wait_queue_entry_tail(&signaler->wait, wq); + pending = 1; + } else { + i915_sw_fence_wake(wq, 0, signaler->error, 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_entry_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_timer { + struct i915_sw_dma_fence_cb base; + struct dma_fence *dma; + struct timer_list timer; + struct irq_work work; + struct rcu_head rcu; +}; + +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); + + i915_sw_fence_set_error_once(cb->fence, dma->error); + i915_sw_fence_complete(cb->fence); + kfree(cb); +} + +static void timer_i915_sw_fence_wake(struct timer_list *t) +{ + struct i915_sw_dma_fence_cb_timer *cb = from_timer(cb, t, timer); + struct i915_sw_fence *fence; + + fence = xchg(&cb->base.fence, NULL); + if (!fence) + return; + + pr_notice("Asynchronous wait on fence %s:%s:%llx timed out (hint:%ps)\n", + cb->dma->ops->get_driver_name(cb->dma), + cb->dma->ops->get_timeline_name(cb->dma), + cb->dma->seqno, + i915_sw_fence_debug_hint(fence)); + + i915_sw_fence_set_error_once(fence, -ETIMEDOUT); + i915_sw_fence_complete(fence); +} + +static void dma_i915_sw_fence_wake_timer(struct dma_fence *dma, + struct dma_fence_cb *data) +{ + struct i915_sw_dma_fence_cb_timer *cb = + container_of(data, typeof(*cb), base.base); + struct i915_sw_fence *fence; + + fence = xchg(&cb->base.fence, NULL); + if (fence) { + i915_sw_fence_set_error_once(fence, dma->error); + i915_sw_fence_complete(fence); + } + + irq_work_queue(&cb->work); +} + +static void irq_i915_sw_fence_work(struct irq_work *wrk) +{ + struct i915_sw_dma_fence_cb_timer *cb = + container_of(wrk, typeof(*cb), work); + + timer_shutdown_sync(&cb->timer); + dma_fence_put(cb->dma); + + kfree_rcu(cb, rcu); +} + +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; + dma_fence_func_t func; + int ret; + + debug_fence_assert(fence); + might_sleep_if(gfpflags_allow_blocking(gfp)); + + if (dma_fence_is_signaled(dma)) { + i915_sw_fence_set_error_once(fence, dma->error); + return 0; + } + + cb = kmalloc(timeout ? + sizeof(struct i915_sw_dma_fence_cb_timer) : + sizeof(struct i915_sw_dma_fence_cb), + gfp); + if (!cb) { + if (!gfpflags_allow_blocking(gfp)) + return -ENOMEM; + + ret = dma_fence_wait(dma, false); + if (ret) + return ret; + + i915_sw_fence_set_error_once(fence, dma->error); + return 0; + } + + cb->fence = fence; + i915_sw_fence_await(fence); + + func = dma_i915_sw_fence_wake; + if (timeout) { + struct i915_sw_dma_fence_cb_timer *timer = + container_of(cb, typeof(*timer), base); + + timer->dma = dma_fence_get(dma); + init_irq_work(&timer->work, irq_i915_sw_fence_work); + + timer_setup(&timer->timer, + timer_i915_sw_fence_wake, TIMER_IRQSAFE); + mod_timer(&timer->timer, round_jiffies_up(jiffies + timeout)); + + func = dma_i915_sw_fence_wake_timer; + } + + ret = dma_fence_add_callback(dma, &cb->base, func); + if (ret == 0) { + ret = 1; + } else { + func(dma, &cb->base); + if (ret == -ENOENT) /* fence already signaled */ + ret = 0; + } + + return ret; +} + +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); + + i915_sw_fence_set_error_once(cb->fence, dma->error); + i915_sw_fence_complete(cb->fence); +} + +int __i915_sw_fence_await_dma_fence(struct i915_sw_fence *fence, + struct dma_fence *dma, + struct i915_sw_dma_fence_cb *cb) +{ + int ret; + + debug_fence_assert(fence); + + if (dma_fence_is_signaled(dma)) { + i915_sw_fence_set_error_once(fence, dma->error); + return 0; + } + + cb->fence = fence; + i915_sw_fence_await(fence); + + ret = 1; + if (dma_fence_add_callback(dma, &cb->base, __dma_i915_sw_fence_wake)) { + /* fence already signaled */ + __dma_i915_sw_fence_wake(dma, &cb->base); + ret = 0; + } + + return ret; +} + +int i915_sw_fence_await_reservation(struct i915_sw_fence *fence, + struct dma_resv *resv, + bool write, + unsigned long timeout, + gfp_t gfp) +{ + struct dma_resv_iter cursor; + struct dma_fence *f; + int ret = 0, pending; + + debug_fence_assert(fence); + might_sleep_if(gfpflags_allow_blocking(gfp)); + + dma_resv_iter_begin(&cursor, resv, dma_resv_usage_rw(write)); + dma_resv_for_each_fence_unlocked(&cursor, f) { + pending = i915_sw_fence_await_dma_fence(fence, f, timeout, + gfp); + if (pending < 0) { + ret = pending; + break; + } + + ret |= pending; + } + dma_resv_iter_end(&cursor); + return ret; +} + +#if IS_ENABLED(CONFIG_DRM_I915_SELFTEST) +#include "selftests/lib_sw_fence.c" +#include "selftests/i915_sw_fence.c" +#endif |