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203 lines
5.7 KiB
203 lines
5.7 KiB
// SPDX-License-Identifier: GPL-2.0-only |
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/* |
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* dma-fence-array: aggregate fences to be waited together |
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* |
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* Copyright (C) 2016 Collabora Ltd |
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* Copyright (C) 2016 Advanced Micro Devices, Inc. |
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* Authors: |
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* Gustavo Padovan <[email protected]> |
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* Christian König <[email protected]> |
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*/ |
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#include <linux/export.h> |
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#include <linux/slab.h> |
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#include <linux/dma-fence-array.h> |
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#define PENDING_ERROR 1 |
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static const char *dma_fence_array_get_driver_name(struct dma_fence *fence) |
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{ |
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return "dma_fence_array"; |
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} |
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static const char *dma_fence_array_get_timeline_name(struct dma_fence *fence) |
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{ |
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return "unbound"; |
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} |
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static void dma_fence_array_set_pending_error(struct dma_fence_array *array, |
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int error) |
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{ |
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/* |
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* Propagate the first error reported by any of our fences, but only |
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* before we ourselves are signaled. |
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*/ |
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if (error) |
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cmpxchg(&array->base.error, PENDING_ERROR, error); |
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} |
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static void dma_fence_array_clear_pending_error(struct dma_fence_array *array) |
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{ |
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/* Clear the error flag if not actually set. */ |
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cmpxchg(&array->base.error, PENDING_ERROR, 0); |
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} |
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static void irq_dma_fence_array_work(struct irq_work *wrk) |
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{ |
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struct dma_fence_array *array = container_of(wrk, typeof(*array), work); |
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dma_fence_array_clear_pending_error(array); |
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dma_fence_signal(&array->base); |
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dma_fence_put(&array->base); |
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} |
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static void dma_fence_array_cb_func(struct dma_fence *f, |
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struct dma_fence_cb *cb) |
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{ |
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struct dma_fence_array_cb *array_cb = |
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container_of(cb, struct dma_fence_array_cb, cb); |
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struct dma_fence_array *array = array_cb->array; |
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dma_fence_array_set_pending_error(array, f->error); |
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if (atomic_dec_and_test(&array->num_pending)) |
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irq_work_queue(&array->work); |
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else |
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dma_fence_put(&array->base); |
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} |
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static bool dma_fence_array_enable_signaling(struct dma_fence *fence) |
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{ |
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struct dma_fence_array *array = to_dma_fence_array(fence); |
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struct dma_fence_array_cb *cb = (void *)(&array[1]); |
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unsigned i; |
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for (i = 0; i < array->num_fences; ++i) { |
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cb[i].array = array; |
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/* |
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* As we may report that the fence is signaled before all |
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* callbacks are complete, we need to take an additional |
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* reference count on the array so that we do not free it too |
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* early. The core fence handling will only hold the reference |
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* until we signal the array as complete (but that is now |
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* insufficient). |
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*/ |
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dma_fence_get(&array->base); |
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if (dma_fence_add_callback(array->fences[i], &cb[i].cb, |
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dma_fence_array_cb_func)) { |
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int error = array->fences[i]->error; |
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dma_fence_array_set_pending_error(array, error); |
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dma_fence_put(&array->base); |
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if (atomic_dec_and_test(&array->num_pending)) { |
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dma_fence_array_clear_pending_error(array); |
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return false; |
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} |
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} |
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} |
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return true; |
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} |
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static bool dma_fence_array_signaled(struct dma_fence *fence) |
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{ |
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struct dma_fence_array *array = to_dma_fence_array(fence); |
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return atomic_read(&array->num_pending) <= 0; |
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} |
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static void dma_fence_array_release(struct dma_fence *fence) |
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{ |
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struct dma_fence_array *array = to_dma_fence_array(fence); |
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unsigned i; |
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for (i = 0; i < array->num_fences; ++i) |
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dma_fence_put(array->fences[i]); |
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kfree(array->fences); |
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dma_fence_free(fence); |
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} |
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const struct dma_fence_ops dma_fence_array_ops = { |
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.get_driver_name = dma_fence_array_get_driver_name, |
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.get_timeline_name = dma_fence_array_get_timeline_name, |
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.enable_signaling = dma_fence_array_enable_signaling, |
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.signaled = dma_fence_array_signaled, |
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.release = dma_fence_array_release, |
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}; |
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EXPORT_SYMBOL(dma_fence_array_ops); |
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/** |
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* dma_fence_array_create - Create a custom fence array |
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* @num_fences: [in] number of fences to add in the array |
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* @fences: [in] array containing the fences |
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* @context: [in] fence context to use |
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* @seqno: [in] sequence number to use |
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* @signal_on_any: [in] signal on any fence in the array |
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* |
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* Allocate a dma_fence_array object and initialize the base fence with |
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* dma_fence_init(). |
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* In case of error it returns NULL. |
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* |
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* The caller should allocate the fences array with num_fences size |
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* and fill it with the fences it wants to add to the object. Ownership of this |
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* array is taken and dma_fence_put() is used on each fence on release. |
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* |
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* If @signal_on_any is true the fence array signals if any fence in the array |
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* signals, otherwise it signals when all fences in the array signal. |
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*/ |
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struct dma_fence_array *dma_fence_array_create(int num_fences, |
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struct dma_fence **fences, |
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u64 context, unsigned seqno, |
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bool signal_on_any) |
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{ |
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struct dma_fence_array *array; |
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size_t size = sizeof(*array); |
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/* Allocate the callback structures behind the array. */ |
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size += num_fences * sizeof(struct dma_fence_array_cb); |
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array = kzalloc(size, GFP_KERNEL); |
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if (!array) |
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return NULL; |
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spin_lock_init(&array->lock); |
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dma_fence_init(&array->base, &dma_fence_array_ops, &array->lock, |
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context, seqno); |
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init_irq_work(&array->work, irq_dma_fence_array_work); |
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array->num_fences = num_fences; |
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atomic_set(&array->num_pending, signal_on_any ? 1 : num_fences); |
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array->fences = fences; |
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array->base.error = PENDING_ERROR; |
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return array; |
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} |
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EXPORT_SYMBOL(dma_fence_array_create); |
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/** |
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* dma_fence_match_context - Check if all fences are from the given context |
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* @fence: [in] fence or fence array |
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* @context: [in] fence context to check all fences against |
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* |
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* Checks the provided fence or, for a fence array, all fences in the array |
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* against the given context. Returns false if any fence is from a different |
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* context. |
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*/ |
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bool dma_fence_match_context(struct dma_fence *fence, u64 context) |
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{ |
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struct dma_fence_array *array = to_dma_fence_array(fence); |
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unsigned i; |
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if (!dma_fence_is_array(fence)) |
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return fence->context == context; |
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for (i = 0; i < array->num_fences; i++) { |
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if (array->fences[i]->context != context) |
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return false; |
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} |
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return true; |
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} |
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EXPORT_SYMBOL(dma_fence_match_context);
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