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dma-buf: add SPDX header and fix style in dma-resv.c
dma_resv_lockdep() seems to have some space/tab mixups. Fix that and move the function to the end of the file. Also fix some minor things checkpatch.pl pointed out while at it. No functional change. Signed-off-by: Christian König <christian.koenig@amd.com> Acked-by: Daniel Vetter <daniel.vetter@ffwll.ch> Link: https://patchwork.freedesktop.org/patch/msgid/20210602140359.272601-2-christian.koenig@amd.com
This commit is contained in:
Christian König
parent
680753dd9d
commit
068d9d754b
@ -1,3 +1,4 @@
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// SPDX-License-Identifier: MIT
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/*
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* Copyright (C) 2012-2014 Canonical Ltd (Maarten Lankhorst)
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*
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@ -92,49 +93,6 @@ static void dma_resv_list_free(struct dma_resv_list *list)
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kfree_rcu(list, rcu);
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}
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#if IS_ENABLED(CONFIG_LOCKDEP)
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static int __init dma_resv_lockdep(void)
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{
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struct mm_struct *mm = mm_alloc();
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struct ww_acquire_ctx ctx;
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struct dma_resv obj;
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struct address_space mapping;
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int ret;
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if (!mm)
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return -ENOMEM;
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dma_resv_init(&obj);
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address_space_init_once(&mapping);
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mmap_read_lock(mm);
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ww_acquire_init(&ctx, &reservation_ww_class);
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ret = dma_resv_lock(&obj, &ctx);
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if (ret == -EDEADLK)
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dma_resv_lock_slow(&obj, &ctx);
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fs_reclaim_acquire(GFP_KERNEL);
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/* for unmap_mapping_range on trylocked buffer objects in shrinkers */
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i_mmap_lock_write(&mapping);
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i_mmap_unlock_write(&mapping);
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#ifdef CONFIG_MMU_NOTIFIER
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lock_map_acquire(&__mmu_notifier_invalidate_range_start_map);
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__dma_fence_might_wait();
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lock_map_release(&__mmu_notifier_invalidate_range_start_map);
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#else
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__dma_fence_might_wait();
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#endif
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fs_reclaim_release(GFP_KERNEL);
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ww_mutex_unlock(&obj.lock);
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ww_acquire_fini(&ctx);
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mmap_read_unlock(mm);
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mmput(mm);
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return 0;
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}
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subsys_initcall(dma_resv_lockdep);
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#endif
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/**
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* dma_resv_init - initialize a reservation object
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* @obj: the reservation object
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@ -196,9 +154,7 @@ int dma_resv_reserve_shared(struct dma_resv *obj, unsigned int num_fences)
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if (old && old->shared_max) {
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if ((old->shared_count + num_fences) <= old->shared_max)
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return 0;
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else
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max = max(old->shared_count + num_fences,
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old->shared_max * 2);
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max = max(old->shared_count + num_fences, old->shared_max * 2);
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} else {
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max = max(4ul, roundup_pow_of_two(num_fences));
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}
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@ -337,17 +293,17 @@ void dma_resv_add_excl_fence(struct dma_resv *obj, struct dma_fence *fence)
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EXPORT_SYMBOL(dma_resv_add_excl_fence);
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/**
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* dma_resv_copy_fences - Copy all fences from src to dst.
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* @dst: the destination reservation object
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* @src: the source reservation object
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*
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* Copy all fences from src to dst. dst-lock must be held.
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*/
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* dma_resv_copy_fences - Copy all fences from src to dst.
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* @dst: the destination reservation object
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* @src: the source reservation object
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*
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* Copy all fences from src to dst. dst-lock must be held.
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*/
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int dma_resv_copy_fences(struct dma_resv *dst, struct dma_resv *src)
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{
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struct dma_resv_list *src_list, *dst_list;
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struct dma_fence *old, *new;
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unsigned i;
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unsigned int i;
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dma_resv_assert_held(dst);
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@ -356,7 +312,7 @@ int dma_resv_copy_fences(struct dma_resv *dst, struct dma_resv *src)
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retry:
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if (src_list) {
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unsigned shared_count = src_list->shared_count;
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unsigned int shared_count = src_list->shared_count;
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rcu_read_unlock();
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@ -373,6 +329,7 @@ retry:
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dst_list->shared_count = 0;
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for (i = 0; i < src_list->shared_count; ++i) {
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struct dma_fence __rcu **dst;
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struct dma_fence *fence;
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fence = rcu_dereference(src_list->shared[i]);
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@ -391,7 +348,8 @@ retry:
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continue;
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}
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rcu_assign_pointer(dst_list->shared[dst_list->shared_count++], fence);
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dst = &dst_list->shared[dst_list->shared_count++];
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rcu_assign_pointer(*dst, fence);
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}
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} else {
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dst_list = NULL;
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@ -431,7 +389,7 @@ EXPORT_SYMBOL(dma_resv_copy_fences);
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*/
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int dma_resv_get_fences_rcu(struct dma_resv *obj,
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struct dma_fence **pfence_excl,
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unsigned *pshared_count,
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unsigned int *pshared_count,
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struct dma_fence ***pshared)
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{
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struct dma_fence **shared = NULL;
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@ -533,9 +491,9 @@ long dma_resv_wait_timeout_rcu(struct dma_resv *obj,
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bool wait_all, bool intr,
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unsigned long timeout)
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{
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struct dma_fence *fence;
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unsigned seq, shared_count;
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long ret = timeout ? timeout : 1;
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unsigned int seq, shared_count;
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struct dma_fence *fence;
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int i;
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retry:
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@ -565,8 +523,9 @@ retry:
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shared_count = fobj->shared_count;
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for (i = 0; !fence && i < shared_count; ++i) {
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struct dma_fence *lfence = rcu_dereference(fobj->shared[i]);
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struct dma_fence *lfence;
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lfence = rcu_dereference(fobj->shared[i]);
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if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
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&lfence->flags))
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continue;
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@ -633,7 +592,7 @@ static inline int dma_resv_test_signaled_single(struct dma_fence *passed_fence)
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*/
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bool dma_resv_test_signaled_rcu(struct dma_resv *obj, bool test_all)
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{
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unsigned seq, shared_count;
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unsigned int seq, shared_count;
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int ret;
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rcu_read_lock();
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@ -643,16 +602,16 @@ retry:
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seq = read_seqcount_begin(&obj->seq);
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if (test_all) {
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unsigned i;
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struct dma_resv_list *fobj = rcu_dereference(obj->fence);
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unsigned int i;
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if (fobj)
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shared_count = fobj->shared_count;
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for (i = 0; i < shared_count; ++i) {
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struct dma_fence *fence = rcu_dereference(fobj->shared[i]);
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struct dma_fence *fence;
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fence = rcu_dereference(fobj->shared[i]);
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ret = dma_resv_test_signaled_single(fence);
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if (ret < 0)
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goto retry;
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@ -681,3 +640,46 @@ retry:
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return ret;
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}
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EXPORT_SYMBOL_GPL(dma_resv_test_signaled_rcu);
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#if IS_ENABLED(CONFIG_LOCKDEP)
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static int __init dma_resv_lockdep(void)
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{
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struct mm_struct *mm = mm_alloc();
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struct ww_acquire_ctx ctx;
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struct dma_resv obj;
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struct address_space mapping;
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int ret;
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if (!mm)
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return -ENOMEM;
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dma_resv_init(&obj);
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address_space_init_once(&mapping);
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mmap_read_lock(mm);
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ww_acquire_init(&ctx, &reservation_ww_class);
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ret = dma_resv_lock(&obj, &ctx);
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if (ret == -EDEADLK)
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dma_resv_lock_slow(&obj, &ctx);
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fs_reclaim_acquire(GFP_KERNEL);
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/* for unmap_mapping_range on trylocked buffer objects in shrinkers */
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i_mmap_lock_write(&mapping);
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i_mmap_unlock_write(&mapping);
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#ifdef CONFIG_MMU_NOTIFIER
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lock_map_acquire(&__mmu_notifier_invalidate_range_start_map);
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__dma_fence_might_wait();
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lock_map_release(&__mmu_notifier_invalidate_range_start_map);
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#else
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__dma_fence_might_wait();
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#endif
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fs_reclaim_release(GFP_KERNEL);
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ww_mutex_unlock(&obj.lock);
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ww_acquire_fini(&ctx);
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mmap_read_unlock(mm);
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mmput(mm);
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return 0;
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}
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subsys_initcall(dma_resv_lockdep);
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#endif
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