On Wed, Jun 02, 2021 at 02:47:25PM +0200, Christian König wrote:
>
>
> Am 02.06.21 um 14:34 schrieb Daniel Vetter:
> > On Wed, Jun 02, 2021 at 01:17:09PM +0200, Christian König wrote:
> > > No functional change.
> > >
> > > Signed-off-by: Christian König <christian.koe...@amd.com>
> > Acked-by: Daniel Vetter <daniel.vet...@ffwll.ch>
> >
> > Maybe add the checkpatch warnings you're fixing here to the commit
> > message. I didn't know that initcalls should be at the bottom ...
>
> Well dma_resv_lockdep() had some tab/space mixup and moving it around was
> the easiest way to fix that in the editor :)
>
> Moving it to the end seemed logical to me.
Ah whack that into the commit message then, I was confused for a bit :-)
-Daniel
>
> Christian.
>
> > -Daniel
> >
> >
> > > ---
> > > drivers/dma-buf/dma-resv.c | 128 +++++++++++++++++++------------------
> > > 1 file changed, 65 insertions(+), 63 deletions(-)
> > >
> > > diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c
> > > index 6ddbeb5dfbf6..87f5d82d992a 100644
> > > --- a/drivers/dma-buf/dma-resv.c
> > > +++ b/drivers/dma-buf/dma-resv.c
> > > @@ -1,3 +1,4 @@
> > > +// SPDX-License-Identifier: MIT
> > > /*
> > > * Copyright (C) 2012-2014 Canonical Ltd (Maarten Lankhorst)
> > > *
> > > @@ -92,49 +93,6 @@ static void dma_resv_list_free(struct dma_resv_list
> > > *list)
> > > kfree_rcu(list, rcu);
> > > }
> > > -#if IS_ENABLED(CONFIG_LOCKDEP)
> > > -static int __init dma_resv_lockdep(void)
> > > -{
> > > - struct mm_struct *mm = mm_alloc();
> > > - struct ww_acquire_ctx ctx;
> > > - struct dma_resv obj;
> > > - struct address_space mapping;
> > > - int ret;
> > > -
> > > - if (!mm)
> > > - return -ENOMEM;
> > > -
> > > - dma_resv_init(&obj);
> > > - address_space_init_once(&mapping);
> > > -
> > > - mmap_read_lock(mm);
> > > - ww_acquire_init(&ctx, &reservation_ww_class);
> > > - ret = dma_resv_lock(&obj, &ctx);
> > > - if (ret == -EDEADLK)
> > > - dma_resv_lock_slow(&obj, &ctx);
> > > - fs_reclaim_acquire(GFP_KERNEL);
> > > - /* for unmap_mapping_range on trylocked buffer objects in shrinkers */
> > > - i_mmap_lock_write(&mapping);
> > > - i_mmap_unlock_write(&mapping);
> > > -#ifdef CONFIG_MMU_NOTIFIER
> > > - lock_map_acquire(&__mmu_notifier_invalidate_range_start_map);
> > > - __dma_fence_might_wait();
> > > - lock_map_release(&__mmu_notifier_invalidate_range_start_map);
> > > -#else
> > > - __dma_fence_might_wait();
> > > -#endif
> > > - fs_reclaim_release(GFP_KERNEL);
> > > - ww_mutex_unlock(&obj.lock);
> > > - ww_acquire_fini(&ctx);
> > > - mmap_read_unlock(mm);
> > > -
> > > - mmput(mm);
> > > -
> > > - return 0;
> > > -}
> > > -subsys_initcall(dma_resv_lockdep);
> > > -#endif
> > > -
> > > /**
> > > * dma_resv_init - initialize a reservation object
> > > * @obj: the reservation object
> > > @@ -196,9 +154,7 @@ int dma_resv_reserve_shared(struct dma_resv *obj,
> > > unsigned int num_fences)
> > > if (old && old->shared_max) {
> > > if ((old->shared_count + num_fences) <= old->shared_max)
> > > return 0;
> > > - else
> > > - max = max(old->shared_count + num_fences,
> > > - old->shared_max * 2);
> > > + max = max(old->shared_count + num_fences, old->shared_max * 2);
> > > } else {
> > > max = max(4ul, roundup_pow_of_two(num_fences));
> > > }
> > > @@ -337,17 +293,17 @@ void dma_resv_add_excl_fence(struct dma_resv *obj,
> > > struct dma_fence *fence)
> > > EXPORT_SYMBOL(dma_resv_add_excl_fence);
> > > /**
> > > -* dma_resv_copy_fences - Copy all fences from src to dst.
> > > -* @dst: the destination reservation object
> > > -* @src: the source reservation object
> > > -*
> > > -* Copy all fences from src to dst. dst-lock must be held.
> > > -*/
> > > + * dma_resv_copy_fences - Copy all fences from src to dst.
> > > + * @dst: the destination reservation object
> > > + * @src: the source reservation object
> > > + *
> > > + * Copy all fences from src to dst. dst-lock must be held.
> > > + */
> > > int dma_resv_copy_fences(struct dma_resv *dst, struct dma_resv *src)
> > > {
> > > struct dma_resv_list *src_list, *dst_list;
> > > struct dma_fence *old, *new;
> > > - unsigned i;
> > > + unsigned int i;
> > > dma_resv_assert_held(dst);
> > > @@ -356,7 +312,7 @@ int dma_resv_copy_fences(struct dma_resv *dst, struct
> > > dma_resv *src)
> > > retry:
> > > if (src_list) {
> > > - unsigned shared_count = src_list->shared_count;
> > > + unsigned int shared_count = src_list->shared_count;
> > > rcu_read_unlock();
> > > @@ -373,6 +329,7 @@ int dma_resv_copy_fences(struct dma_resv *dst, struct
> > > dma_resv *src)
> > > dst_list->shared_count = 0;
> > > for (i = 0; i < src_list->shared_count; ++i) {
> > > + struct dma_fence __rcu **dst;
> > > struct dma_fence *fence;
> > > fence = rcu_dereference(src_list->shared[i]);
> > > @@ -391,7 +348,8 @@ int dma_resv_copy_fences(struct dma_resv *dst, struct
> > > dma_resv *src)
> > > continue;
> > > }
> > > -
> > > rcu_assign_pointer(dst_list->shared[dst_list->shared_count++], fence);
> > > + dst = &dst_list->shared[dst_list->shared_count++];
> > > + rcu_assign_pointer(*dst, fence);
> > > }
> > > } else {
> > > dst_list = NULL;
> > > @@ -431,7 +389,7 @@ EXPORT_SYMBOL(dma_resv_copy_fences);
> > > */
> > > int dma_resv_get_fences_rcu(struct dma_resv *obj,
> > > struct dma_fence **pfence_excl,
> > > - unsigned *pshared_count,
> > > + unsigned int *pshared_count,
> > > struct dma_fence ***pshared)
> > > {
> > > struct dma_fence **shared = NULL;
> > > @@ -533,9 +491,9 @@ long dma_resv_wait_timeout_rcu(struct dma_resv *obj,
> > > bool wait_all, bool intr,
> > > unsigned long timeout)
> > > {
> > > - struct dma_fence *fence;
> > > - unsigned seq, shared_count;
> > > long ret = timeout ? timeout : 1;
> > > + unsigned int seq, shared_count;
> > > + struct dma_fence *fence;
> > > int i;
> > > retry:
> > > @@ -565,8 +523,9 @@ long dma_resv_wait_timeout_rcu(struct dma_resv *obj,
> > > shared_count = fobj->shared_count;
> > > for (i = 0; !fence && i < shared_count; ++i) {
> > > - struct dma_fence *lfence =
> > > rcu_dereference(fobj->shared[i]);
> > > + struct dma_fence *lfence;
> > > + lfence = rcu_dereference(fobj->shared[i]);
> > > if (test_bit(DMA_FENCE_FLAG_SIGNALED_BIT,
> > > &lfence->flags))
> > > continue;
> > > @@ -633,7 +592,7 @@ static inline int
> > > dma_resv_test_signaled_single(struct dma_fence *passed_fence)
> > > */
> > > bool dma_resv_test_signaled_rcu(struct dma_resv *obj, bool test_all)
> > > {
> > > - unsigned seq, shared_count;
> > > + unsigned int seq, shared_count;
> > > int ret;
> > > rcu_read_lock();
> > > @@ -643,16 +602,16 @@ bool dma_resv_test_signaled_rcu(struct dma_resv
> > > *obj, bool test_all)
> > > seq = read_seqcount_begin(&obj->seq);
> > > if (test_all) {
> > > - unsigned i;
> > > -
> > > struct dma_resv_list *fobj =
> > > rcu_dereference(obj->fence);
> > > + unsigned int i;
> > > if (fobj)
> > > shared_count = fobj->shared_count;
> > > for (i = 0; i < shared_count; ++i) {
> > > - struct dma_fence *fence =
> > > rcu_dereference(fobj->shared[i]);
> > > + struct dma_fence *fence;
> > > + fence = rcu_dereference(fobj->shared[i]);
> > > ret = dma_resv_test_signaled_single(fence);
> > > if (ret < 0)
> > > goto retry;
> > > @@ -681,3 +640,46 @@ bool dma_resv_test_signaled_rcu(struct dma_resv
> > > *obj, bool test_all)
> > > return ret;
> > > }
> > > EXPORT_SYMBOL_GPL(dma_resv_test_signaled_rcu);
> > > +
> > > +#if IS_ENABLED(CONFIG_LOCKDEP)
> > > +static int __init dma_resv_lockdep(void)
> > > +{
> > > + struct mm_struct *mm = mm_alloc();
> > > + struct ww_acquire_ctx ctx;
> > > + struct dma_resv obj;
> > > + struct address_space mapping;
> > > + int ret;
> > > +
> > > + if (!mm)
> > > + return -ENOMEM;
> > > +
> > > + dma_resv_init(&obj);
> > > + address_space_init_once(&mapping);
> > > +
> > > + mmap_read_lock(mm);
> > > + ww_acquire_init(&ctx, &reservation_ww_class);
> > > + ret = dma_resv_lock(&obj, &ctx);
> > > + if (ret == -EDEADLK)
> > > + dma_resv_lock_slow(&obj, &ctx);
> > > + fs_reclaim_acquire(GFP_KERNEL);
> > > + /* for unmap_mapping_range on trylocked buffer objects in shrinkers */
> > > + i_mmap_lock_write(&mapping);
> > > + i_mmap_unlock_write(&mapping);
> > > +#ifdef CONFIG_MMU_NOTIFIER
> > > + lock_map_acquire(&__mmu_notifier_invalidate_range_start_map);
> > > + __dma_fence_might_wait();
> > > + lock_map_release(&__mmu_notifier_invalidate_range_start_map);
> > > +#else
> > > + __dma_fence_might_wait();
> > > +#endif
> > > + fs_reclaim_release(GFP_KERNEL);
> > > + ww_mutex_unlock(&obj.lock);
> > > + ww_acquire_fini(&ctx);
> > > + mmap_read_unlock(mm);
> > > +
> > > + mmput(mm);
> > > +
> > > + return 0;
> > > +}
> > > +subsys_initcall(dma_resv_lockdep);
> > > +#endif
> > > --
> > > 2.25.1
> > >
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
