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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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f54d186700
I plan to usurp the short name of struct fence for a core kernel struct, and so I need to rename the specialised fence/timeline for DMA operations to make room. A consensus was reached in https://lists.freedesktop.org/archives/dri-devel/2016-July/113083.html that making clear this fence applies to DMA operations was a good thing. Since then the patch has grown a bit as usage increases, so hopefully it remains a good thing! (v2...: rebase, rerun spatch) v3: Compile on msm, spotted a manual fixup that I broke. v4: Try again for msm, sorry Daniel coccinelle script: @@ @@ - struct fence + struct dma_fence @@ @@ - struct fence_ops + struct dma_fence_ops @@ @@ - struct fence_cb + struct dma_fence_cb @@ @@ - struct fence_array + struct dma_fence_array @@ @@ - enum fence_flag_bits + enum dma_fence_flag_bits @@ @@ ( - fence_init + dma_fence_init | - fence_release + dma_fence_release | - fence_free + dma_fence_free | - fence_get + dma_fence_get | - fence_get_rcu + dma_fence_get_rcu | - fence_put + dma_fence_put | - fence_signal + dma_fence_signal | - fence_signal_locked + dma_fence_signal_locked | - fence_default_wait + dma_fence_default_wait | - fence_add_callback + dma_fence_add_callback | - fence_remove_callback + dma_fence_remove_callback | - fence_enable_sw_signaling + dma_fence_enable_sw_signaling | - fence_is_signaled_locked + dma_fence_is_signaled_locked | - fence_is_signaled + dma_fence_is_signaled | - fence_is_later + dma_fence_is_later | - fence_later + dma_fence_later | - fence_wait_timeout + dma_fence_wait_timeout | - fence_wait_any_timeout + dma_fence_wait_any_timeout | - fence_wait + dma_fence_wait | - fence_context_alloc + dma_fence_context_alloc | - fence_array_create + dma_fence_array_create | - to_fence_array + to_dma_fence_array | - fence_is_array + dma_fence_is_array | - trace_fence_emit + trace_dma_fence_emit | - FENCE_TRACE + DMA_FENCE_TRACE | - FENCE_WARN + DMA_FENCE_WARN | - FENCE_ERR + DMA_FENCE_ERR ) ( ... ) Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk> Reviewed-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk> Acked-by: Sumit Semwal <sumit.semwal@linaro.org> Acked-by: Christian König <christian.koenig@amd.com> Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: http://patchwork.freedesktop.org/patch/msgid/20161025120045.28839-1-chris@chris-wilson.co.uk
147 lines
4.4 KiB
C
147 lines
4.4 KiB
C
/*
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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 <gustavo@padovan.org>
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* Christian König <christian.koenig@amd.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 as published by
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* the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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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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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_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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if (atomic_dec_and_test(&array->num_pending))
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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 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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dma_fence_put(&array->base);
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if (atomic_dec_and_test(&array->num_pending))
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return false;
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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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.wait = dma_fence_default_wait,
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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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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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return array;
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}
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EXPORT_SYMBOL(dma_fence_array_create);
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