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577 lines
10 KiB
577 lines
10 KiB
/* SPDX-License-Identifier: MIT */ |
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/* |
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* Copyright © 2019 Intel Corporation |
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*/ |
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#include <linux/delay.h> |
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#include <linux/dma-fence.h> |
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#include <linux/kernel.h> |
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#include <linux/kthread.h> |
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#include <linux/sched/signal.h> |
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#include <linux/slab.h> |
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#include <linux/spinlock.h> |
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#include "selftest.h" |
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static struct kmem_cache *slab_fences; |
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static struct mock_fence { |
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struct dma_fence base; |
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struct spinlock lock; |
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} *to_mock_fence(struct dma_fence *f) { |
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return container_of(f, struct mock_fence, base); |
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} |
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static const char *mock_name(struct dma_fence *f) |
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{ |
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return "mock"; |
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} |
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static void mock_fence_release(struct dma_fence *f) |
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{ |
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kmem_cache_free(slab_fences, to_mock_fence(f)); |
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} |
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struct wait_cb { |
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struct dma_fence_cb cb; |
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struct task_struct *task; |
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}; |
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static void mock_wakeup(struct dma_fence *f, struct dma_fence_cb *cb) |
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{ |
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wake_up_process(container_of(cb, struct wait_cb, cb)->task); |
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} |
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static long mock_wait(struct dma_fence *f, bool intr, long timeout) |
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{ |
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const int state = intr ? TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE; |
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struct wait_cb cb = { .task = current }; |
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if (dma_fence_add_callback(f, &cb.cb, mock_wakeup)) |
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return timeout; |
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while (timeout) { |
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set_current_state(state); |
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if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &f->flags)) |
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break; |
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if (signal_pending_state(state, current)) |
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break; |
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timeout = schedule_timeout(timeout); |
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} |
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__set_current_state(TASK_RUNNING); |
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if (!dma_fence_remove_callback(f, &cb.cb)) |
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return timeout; |
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if (signal_pending_state(state, current)) |
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return -ERESTARTSYS; |
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return -ETIME; |
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} |
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static const struct dma_fence_ops mock_ops = { |
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.get_driver_name = mock_name, |
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.get_timeline_name = mock_name, |
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.wait = mock_wait, |
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.release = mock_fence_release, |
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}; |
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static struct dma_fence *mock_fence(void) |
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{ |
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struct mock_fence *f; |
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f = kmem_cache_alloc(slab_fences, GFP_KERNEL); |
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if (!f) |
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return NULL; |
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spin_lock_init(&f->lock); |
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dma_fence_init(&f->base, &mock_ops, &f->lock, 0, 0); |
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return &f->base; |
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} |
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static int sanitycheck(void *arg) |
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{ |
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struct dma_fence *f; |
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f = mock_fence(); |
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if (!f) |
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return -ENOMEM; |
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dma_fence_signal(f); |
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dma_fence_put(f); |
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return 0; |
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} |
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static int test_signaling(void *arg) |
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{ |
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struct dma_fence *f; |
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int err = -EINVAL; |
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f = mock_fence(); |
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if (!f) |
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return -ENOMEM; |
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if (dma_fence_is_signaled(f)) { |
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pr_err("Fence unexpectedly signaled on creation\n"); |
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goto err_free; |
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} |
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if (dma_fence_signal(f)) { |
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pr_err("Fence reported being already signaled\n"); |
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goto err_free; |
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} |
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if (!dma_fence_is_signaled(f)) { |
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pr_err("Fence not reporting signaled\n"); |
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goto err_free; |
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} |
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if (!dma_fence_signal(f)) { |
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pr_err("Fence reported not being already signaled\n"); |
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goto err_free; |
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} |
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err = 0; |
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err_free: |
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dma_fence_put(f); |
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return err; |
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} |
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struct simple_cb { |
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struct dma_fence_cb cb; |
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bool seen; |
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}; |
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static void simple_callback(struct dma_fence *f, struct dma_fence_cb *cb) |
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{ |
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smp_store_mb(container_of(cb, struct simple_cb, cb)->seen, true); |
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} |
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static int test_add_callback(void *arg) |
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{ |
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struct simple_cb cb = {}; |
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struct dma_fence *f; |
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int err = -EINVAL; |
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f = mock_fence(); |
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if (!f) |
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return -ENOMEM; |
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if (dma_fence_add_callback(f, &cb.cb, simple_callback)) { |
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pr_err("Failed to add callback, fence already signaled!\n"); |
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goto err_free; |
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} |
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dma_fence_signal(f); |
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if (!cb.seen) { |
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pr_err("Callback failed!\n"); |
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goto err_free; |
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} |
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err = 0; |
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err_free: |
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dma_fence_put(f); |
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return err; |
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} |
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static int test_late_add_callback(void *arg) |
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{ |
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struct simple_cb cb = {}; |
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struct dma_fence *f; |
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int err = -EINVAL; |
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f = mock_fence(); |
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if (!f) |
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return -ENOMEM; |
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dma_fence_signal(f); |
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if (!dma_fence_add_callback(f, &cb.cb, simple_callback)) { |
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pr_err("Added callback, but fence was already signaled!\n"); |
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goto err_free; |
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} |
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dma_fence_signal(f); |
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if (cb.seen) { |
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pr_err("Callback called after failed attachment !\n"); |
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goto err_free; |
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} |
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err = 0; |
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err_free: |
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dma_fence_put(f); |
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return err; |
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} |
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static int test_rm_callback(void *arg) |
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{ |
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struct simple_cb cb = {}; |
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struct dma_fence *f; |
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int err = -EINVAL; |
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f = mock_fence(); |
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if (!f) |
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return -ENOMEM; |
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if (dma_fence_add_callback(f, &cb.cb, simple_callback)) { |
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pr_err("Failed to add callback, fence already signaled!\n"); |
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goto err_free; |
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} |
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if (!dma_fence_remove_callback(f, &cb.cb)) { |
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pr_err("Failed to remove callback!\n"); |
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goto err_free; |
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} |
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dma_fence_signal(f); |
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if (cb.seen) { |
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pr_err("Callback still signaled after removal!\n"); |
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goto err_free; |
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} |
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err = 0; |
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err_free: |
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dma_fence_put(f); |
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return err; |
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} |
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static int test_late_rm_callback(void *arg) |
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{ |
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struct simple_cb cb = {}; |
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struct dma_fence *f; |
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int err = -EINVAL; |
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f = mock_fence(); |
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if (!f) |
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return -ENOMEM; |
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if (dma_fence_add_callback(f, &cb.cb, simple_callback)) { |
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pr_err("Failed to add callback, fence already signaled!\n"); |
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goto err_free; |
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} |
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dma_fence_signal(f); |
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if (!cb.seen) { |
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pr_err("Callback failed!\n"); |
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goto err_free; |
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} |
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if (dma_fence_remove_callback(f, &cb.cb)) { |
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pr_err("Callback removal succeed after being executed!\n"); |
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goto err_free; |
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} |
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err = 0; |
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err_free: |
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dma_fence_put(f); |
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return err; |
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} |
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static int test_status(void *arg) |
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{ |
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struct dma_fence *f; |
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int err = -EINVAL; |
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f = mock_fence(); |
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if (!f) |
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return -ENOMEM; |
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if (dma_fence_get_status(f)) { |
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pr_err("Fence unexpectedly has signaled status on creation\n"); |
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goto err_free; |
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} |
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dma_fence_signal(f); |
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if (!dma_fence_get_status(f)) { |
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pr_err("Fence not reporting signaled status\n"); |
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goto err_free; |
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} |
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err = 0; |
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err_free: |
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dma_fence_put(f); |
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return err; |
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} |
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static int test_error(void *arg) |
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{ |
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struct dma_fence *f; |
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int err = -EINVAL; |
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f = mock_fence(); |
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if (!f) |
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return -ENOMEM; |
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dma_fence_set_error(f, -EIO); |
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if (dma_fence_get_status(f)) { |
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pr_err("Fence unexpectedly has error status before signal\n"); |
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goto err_free; |
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} |
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dma_fence_signal(f); |
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if (dma_fence_get_status(f) != -EIO) { |
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pr_err("Fence not reporting error status, got %d\n", |
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dma_fence_get_status(f)); |
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goto err_free; |
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} |
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err = 0; |
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err_free: |
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dma_fence_put(f); |
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return err; |
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} |
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static int test_wait(void *arg) |
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{ |
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struct dma_fence *f; |
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int err = -EINVAL; |
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f = mock_fence(); |
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if (!f) |
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return -ENOMEM; |
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if (dma_fence_wait_timeout(f, false, 0) != -ETIME) { |
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pr_err("Wait reported complete before being signaled\n"); |
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goto err_free; |
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} |
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dma_fence_signal(f); |
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if (dma_fence_wait_timeout(f, false, 0) != 0) { |
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pr_err("Wait reported incomplete after being signaled\n"); |
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goto err_free; |
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} |
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err = 0; |
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err_free: |
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dma_fence_signal(f); |
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dma_fence_put(f); |
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return err; |
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} |
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struct wait_timer { |
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struct timer_list timer; |
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struct dma_fence *f; |
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}; |
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static void wait_timer(struct timer_list *timer) |
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{ |
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struct wait_timer *wt = from_timer(wt, timer, timer); |
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dma_fence_signal(wt->f); |
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} |
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static int test_wait_timeout(void *arg) |
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{ |
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struct wait_timer wt; |
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int err = -EINVAL; |
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timer_setup_on_stack(&wt.timer, wait_timer, 0); |
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wt.f = mock_fence(); |
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if (!wt.f) |
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return -ENOMEM; |
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if (dma_fence_wait_timeout(wt.f, false, 1) != -ETIME) { |
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pr_err("Wait reported complete before being signaled\n"); |
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goto err_free; |
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} |
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mod_timer(&wt.timer, jiffies + 1); |
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if (dma_fence_wait_timeout(wt.f, false, 2) == -ETIME) { |
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if (timer_pending(&wt.timer)) { |
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pr_notice("Timer did not fire within the jiffie!\n"); |
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err = 0; /* not our fault! */ |
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} else { |
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pr_err("Wait reported incomplete after timeout\n"); |
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} |
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goto err_free; |
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} |
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err = 0; |
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err_free: |
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del_timer_sync(&wt.timer); |
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destroy_timer_on_stack(&wt.timer); |
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dma_fence_signal(wt.f); |
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dma_fence_put(wt.f); |
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return err; |
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} |
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static int test_stub(void *arg) |
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{ |
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struct dma_fence *f[64]; |
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int err = -EINVAL; |
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int i; |
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for (i = 0; i < ARRAY_SIZE(f); i++) { |
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f[i] = dma_fence_get_stub(); |
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if (!dma_fence_is_signaled(f[i])) { |
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pr_err("Obtained unsignaled stub fence!\n"); |
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goto err; |
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} |
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} |
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err = 0; |
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err: |
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while (i--) |
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dma_fence_put(f[i]); |
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return err; |
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} |
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/* Now off to the races! */ |
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struct race_thread { |
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struct dma_fence __rcu **fences; |
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struct task_struct *task; |
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bool before; |
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int id; |
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}; |
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static void __wait_for_callbacks(struct dma_fence *f) |
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{ |
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spin_lock_irq(f->lock); |
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spin_unlock_irq(f->lock); |
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} |
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static int thread_signal_callback(void *arg) |
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{ |
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const struct race_thread *t = arg; |
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unsigned long pass = 0; |
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unsigned long miss = 0; |
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int err = 0; |
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while (!err && !kthread_should_stop()) { |
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struct dma_fence *f1, *f2; |
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struct simple_cb cb; |
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f1 = mock_fence(); |
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if (!f1) { |
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err = -ENOMEM; |
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break; |
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} |
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rcu_assign_pointer(t->fences[t->id], f1); |
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smp_wmb(); |
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rcu_read_lock(); |
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do { |
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f2 = dma_fence_get_rcu_safe(&t->fences[!t->id]); |
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} while (!f2 && !kthread_should_stop()); |
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rcu_read_unlock(); |
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if (t->before) |
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dma_fence_signal(f1); |
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smp_store_mb(cb.seen, false); |
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if (!f2 || |
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dma_fence_add_callback(f2, &cb.cb, simple_callback)) { |
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miss++; |
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cb.seen = true; |
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} |
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if (!t->before) |
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dma_fence_signal(f1); |
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if (!cb.seen) { |
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dma_fence_wait(f2, false); |
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__wait_for_callbacks(f2); |
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} |
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if (!READ_ONCE(cb.seen)) { |
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pr_err("Callback not seen on thread %d, pass %lu (%lu misses), signaling %s add_callback; fence signaled? %s\n", |
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t->id, pass, miss, |
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t->before ? "before" : "after", |
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dma_fence_is_signaled(f2) ? "yes" : "no"); |
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err = -EINVAL; |
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} |
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dma_fence_put(f2); |
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rcu_assign_pointer(t->fences[t->id], NULL); |
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smp_wmb(); |
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dma_fence_put(f1); |
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pass++; |
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} |
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pr_info("%s[%d] completed %lu passes, %lu misses\n", |
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__func__, t->id, pass, miss); |
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return err; |
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} |
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static int race_signal_callback(void *arg) |
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{ |
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struct dma_fence __rcu *f[2] = {}; |
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int ret = 0; |
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int pass; |
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for (pass = 0; !ret && pass <= 1; pass++) { |
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struct race_thread t[2]; |
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int i; |
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for (i = 0; i < ARRAY_SIZE(t); i++) { |
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t[i].fences = f; |
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t[i].id = i; |
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t[i].before = pass; |
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t[i].task = kthread_run(thread_signal_callback, &t[i], |
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"dma-fence:%d", i); |
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get_task_struct(t[i].task); |
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} |
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msleep(50); |
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for (i = 0; i < ARRAY_SIZE(t); i++) { |
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int err; |
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err = kthread_stop(t[i].task); |
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if (err && !ret) |
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ret = err; |
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put_task_struct(t[i].task); |
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} |
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} |
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return ret; |
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} |
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int dma_fence(void) |
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{ |
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static const struct subtest tests[] = { |
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SUBTEST(sanitycheck), |
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SUBTEST(test_signaling), |
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SUBTEST(test_add_callback), |
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SUBTEST(test_late_add_callback), |
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SUBTEST(test_rm_callback), |
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SUBTEST(test_late_rm_callback), |
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SUBTEST(test_status), |
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SUBTEST(test_error), |
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SUBTEST(test_wait), |
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SUBTEST(test_wait_timeout), |
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SUBTEST(test_stub), |
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SUBTEST(race_signal_callback), |
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}; |
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int ret; |
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pr_info("sizeof(dma_fence)=%zu\n", sizeof(struct dma_fence)); |
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slab_fences = KMEM_CACHE(mock_fence, |
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SLAB_TYPESAFE_BY_RCU | |
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SLAB_HWCACHE_ALIGN); |
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if (!slab_fences) |
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return -ENOMEM; |
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ret = subtests(tests, NULL); |
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kmem_cache_destroy(slab_fences); |
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return ret; |
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}
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