Am 14.08.19 um 20:26 schrieb Chris Wilson:
> Quoting Chris Wilson (2019-08-14 19:24:01)
>> This reverts
>> 67c97fb79a7f ("dma-buf: add reservation_object_fences helper")
>> dd7a7d1ff2f1 ("drm/i915: use new reservation_object_fences helper")
>> 0e1d8083bddb ("dma-buf: further relax reservation_object_add_shared_fence")
>> 5d344f58da76 ("dma-buf: nuke reservation_object seq number")
>>
>> The scenario that defeats simply grabbing a set of shared/exclusive
>> fences and using them blissfully under RCU is that any of those fences
>> may be reallocated by a SLAB_TYPESAFE_BY_RCU fence slab cache. In this
>> scenario, while keeping the rcu_read_lock we need to establish that no
>> fence was changed in the dma_resv after a read (or full) memory barrier.
>>
>> Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Acked-by: Christian König <christian.koenig@xxxxxxx>
>> Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
> I said I needed to go lie down, that proves it.
>
> Cc: Christian König <christian.koenig@xxxxxxx>
>
>> Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
>> ---
>> drivers/dma-buf/dma-buf.c | 31 ++++-
>> drivers/dma-buf/dma-resv.c | 109 ++++++++++++-----
>> .../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 7 +-
>> drivers/gpu/drm/i915/gem/i915_gem_busy.c | 24 ++--
>> include/linux/dma-resv.h | 113 ++++++++----------
>> 5 files changed, 175 insertions(+), 109 deletions(-)
>>
>> diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
>> index b3400d6524ab..433d91d710e4 100644
>> --- a/drivers/dma-buf/dma-buf.c
>> +++ b/drivers/dma-buf/dma-buf.c
>> @@ -199,7 +199,7 @@ static __poll_t dma_buf_poll(struct file *file, poll_table *poll)
>> struct dma_resv_list *fobj;
>> struct dma_fence *fence_excl;
>> __poll_t events;
>> - unsigned shared_count;
>> + unsigned shared_count, seq;
>>
>> dmabuf = file->private_data;
>> if (!dmabuf || !dmabuf->resv)
>> @@ -213,8 +213,21 @@ static __poll_t dma_buf_poll(struct file *file, poll_table *poll)
>> if (!events)
>> return 0;
>>
>> +retry:
>> + seq = read_seqcount_begin(&resv->seq);
>> rcu_read_lock();
>> - dma_resv_fences(resv, &fence_excl, &fobj, &shared_count);
>> +
>> + fobj = rcu_dereference(resv->fence);
>> + if (fobj)
>> + shared_count = fobj->shared_count;
>> + else
>> + shared_count = 0;
>> + fence_excl = rcu_dereference(resv->fence_excl);
>> + if (read_seqcount_retry(&resv->seq, seq)) {
>> + rcu_read_unlock();
>> + goto retry;
>> + }
>> +
>> if (fence_excl && (!(events & EPOLLOUT) || shared_count == 0)) {
>> struct dma_buf_poll_cb_t *dcb = &dmabuf->cb_excl;
>> __poll_t pevents = EPOLLIN;
>> @@ -1144,6 +1157,7 @@ static int dma_buf_debug_show(struct seq_file *s, void *unused)
>> struct dma_resv *robj;
>> struct dma_resv_list *fobj;
>> struct dma_fence *fence;
>> + unsigned seq;
>> int count = 0, attach_count, shared_count, i;
>> size_t size = 0;
>>
>> @@ -1174,9 +1188,16 @@ static int dma_buf_debug_show(struct seq_file *s, void *unused)
>> buf_obj->name ?: "");
>>
>> robj = buf_obj->resv;
>> - rcu_read_lock();
>> - dma_resv_fences(robj, &fence, &fobj, &shared_count);
>> - rcu_read_unlock();
>> + while (true) {
>> + seq = read_seqcount_begin(&robj->seq);
>> + rcu_read_lock();
>> + fobj = rcu_dereference(robj->fence);
>> + shared_count = fobj ? fobj->shared_count : 0;
>> + fence = rcu_dereference(robj->fence_excl);
>> + if (!read_seqcount_retry(&robj->seq, seq))
>> + break;
>> + rcu_read_unlock();
>> + }
>>
>> if (fence)
>> seq_printf(s, "\tExclusive fence: %s %s %ssignalled\n",
>> diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c
>> index f5142683c851..42a8f3f11681 100644
>> --- a/drivers/dma-buf/dma-resv.c
>> +++ b/drivers/dma-buf/dma-resv.c
>> @@ -49,6 +49,12 @@
>> DEFINE_WD_CLASS(reservation_ww_class);
>> EXPORT_SYMBOL(reservation_ww_class);
>>
>> +struct lock_class_key reservation_seqcount_class;
>> +EXPORT_SYMBOL(reservation_seqcount_class);
>> +
>> +const char reservation_seqcount_string[] = "reservation_seqcount";
>> +EXPORT_SYMBOL(reservation_seqcount_string);
>> +
>> /**
>> * dma_resv_list_alloc - allocate fence list
>> * @shared_max: number of fences we need space for
>> @@ -96,6 +102,9 @@ static void dma_resv_list_free(struct dma_resv_list *list)
>> void dma_resv_init(struct dma_resv *obj)
>> {
>> ww_mutex_init(&obj->lock, &reservation_ww_class);
>> +
>> + __seqcount_init(&obj->seq, reservation_seqcount_string,
>> + &reservation_seqcount_class);
>> RCU_INIT_POINTER(obj->fence, NULL);
>> RCU_INIT_POINTER(obj->fence_excl, NULL);
>> }
>> @@ -225,6 +234,9 @@ void dma_resv_add_shared_fence(struct dma_resv *obj, struct dma_fence *fence)
>> fobj = dma_resv_get_list(obj);
>> count = fobj->shared_count;
>>
>> + preempt_disable();
>> + write_seqcount_begin(&obj->seq);
>> +
>> for (i = 0; i < count; ++i) {
>>
>> old = rcu_dereference_protected(fobj->shared[i],
>> @@ -242,6 +254,9 @@ void dma_resv_add_shared_fence(struct dma_resv *obj, struct dma_fence *fence)
>> RCU_INIT_POINTER(fobj->shared[i], fence);
>> /* pointer update must be visible before we extend the shared_count */
>> smp_store_mb(fobj->shared_count, count);
>> +
>> + write_seqcount_end(&obj->seq);
>> + preempt_enable();
>> dma_fence_put(old);
>> }
>> EXPORT_SYMBOL(dma_resv_add_shared_fence);
>> @@ -269,10 +284,12 @@ void dma_resv_add_excl_fence(struct dma_resv *obj, struct dma_fence *fence)
>> dma_fence_get(fence);
>>
>> preempt_disable();
>> - rcu_assign_pointer(obj->fence_excl, fence);
>> - /* pointer update must be visible before we modify the shared_count */
>> + write_seqcount_begin(&obj->seq);
>> + /* write_seqcount_begin provides the necessary memory barrier */
>> + RCU_INIT_POINTER(obj->fence_excl, fence);
>> if (old)
>> - smp_store_mb(old->shared_count, 0);
>> + old->shared_count = 0;
>> + write_seqcount_end(&obj->seq);
>> preempt_enable();
>>
>> /* inplace update, no shared fences */
>> @@ -295,15 +312,17 @@ 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 int i, shared_count;
>> + unsigned i;
>>
>> dma_resv_assert_held(dst);
>>
>> rcu_read_lock();
>> + src_list = rcu_dereference(src->fence);
>>
>> retry:
>> - dma_resv_fences(src, &new, &src_list, &shared_count);
>> - if (shared_count) {
>> + if (src_list) {
>> + unsigned shared_count = src_list->shared_count;
>> +
>> rcu_read_unlock();
>>
>> dst_list = dma_resv_list_alloc(shared_count);
>> @@ -311,14 +330,14 @@ int dma_resv_copy_fences(struct dma_resv *dst, struct dma_resv *src)
>> return -ENOMEM;
>>
>> rcu_read_lock();
>> - dma_resv_fences(src, &new, &src_list, &shared_count);
>> - if (!src_list || shared_count > dst_list->shared_max) {
>> + src_list = rcu_dereference(src->fence);
>> + if (!src_list || src_list->shared_count > shared_count) {
>> kfree(dst_list);
>> goto retry;
>> }
>>
>> dst_list->shared_count = 0;
>> - for (i = 0; i < shared_count; ++i) {
>> + for (i = 0; i < src_list->shared_count; ++i) {
>> struct dma_fence *fence;
>>
>> fence = rcu_dereference(src_list->shared[i]);
>> @@ -328,6 +347,7 @@ int dma_resv_copy_fences(struct dma_resv *dst, struct dma_resv *src)
>>
>> if (!dma_fence_get_rcu(fence)) {
>> dma_resv_list_free(dst_list);
>> + src_list = rcu_dereference(src->fence);
>> goto retry;
>> }
>>
>> @@ -342,18 +362,18 @@ int dma_resv_copy_fences(struct dma_resv *dst, struct dma_resv *src)
>> dst_list = NULL;
>> }
>>
>> - if (new && !dma_fence_get_rcu(new)) {
>> - dma_resv_list_free(dst_list);
>> - goto retry;
>> - }
>> + new = dma_fence_get_rcu_safe(&src->fence_excl);
>> rcu_read_unlock();
>>
>> src_list = dma_resv_get_list(dst);
>> old = dma_resv_get_excl(dst);
>>
>> preempt_disable();
>> - rcu_assign_pointer(dst->fence_excl, new);
>> - rcu_assign_pointer(dst->fence, dst_list);
>> + write_seqcount_begin(&dst->seq);
>> + /* write_seqcount_begin provides the necessary memory barrier */
>> + RCU_INIT_POINTER(dst->fence_excl, new);
>> + RCU_INIT_POINTER(dst->fence, dst_list);
>> + write_seqcount_end(&dst->seq);
>> preempt_enable();
>>
>> dma_resv_list_free(src_list);
>> @@ -388,18 +408,19 @@ int dma_resv_get_fences_rcu(struct dma_resv *obj,
>>
>> do {
>> struct dma_resv_list *fobj;
>> - unsigned int i;
>> + unsigned int i, seq;
>> size_t sz = 0;
>>
>> - i = 0;
>> + shared_count = i = 0;
>>
>> rcu_read_lock();
>> - dma_resv_fences(obj, &fence_excl, &fobj,
>> - &shared_count);
>> + seq = read_seqcount_begin(&obj->seq);
>>
>> + fence_excl = rcu_dereference(obj->fence_excl);
>> if (fence_excl && !dma_fence_get_rcu(fence_excl))
>> goto unlock;
>>
>> + fobj = rcu_dereference(obj->fence);
>> if (fobj)
>> sz += sizeof(*shared) * fobj->shared_max;
>>
>> @@ -427,6 +448,7 @@ int dma_resv_get_fences_rcu(struct dma_resv *obj,
>> break;
>> }
>> shared = nshared;
>> + shared_count = fobj ? fobj->shared_count : 0;
>> for (i = 0; i < shared_count; ++i) {
>> shared[i] = rcu_dereference(fobj->shared[i]);
>> if (!dma_fence_get_rcu(shared[i]))
>> @@ -434,7 +456,7 @@ int dma_resv_get_fences_rcu(struct dma_resv *obj,
>> }
>> }
>>
>> - if (i != shared_count) {
>> + if (i != shared_count || read_seqcount_retry(&obj->seq, seq)) {
>> while (i--)
>> dma_fence_put(shared[i]);
>> dma_fence_put(fence_excl);
>> @@ -478,17 +500,18 @@ long dma_resv_wait_timeout_rcu(struct dma_resv *obj,
>> bool wait_all, bool intr,
>> unsigned long timeout)
>> {
>> - struct dma_resv_list *fobj;
>> struct dma_fence *fence;
>> - unsigned shared_count;
>> + unsigned seq, shared_count;
>> long ret = timeout ? timeout : 1;
>> int i;
>>
>> retry:
>> + shared_count = 0;
>> + seq = read_seqcount_begin(&obj->seq);
>> rcu_read_lock();
>> i = -1;
>>
>> - dma_resv_fences(obj, &fence, &fobj, &shared_count);
>> + fence = rcu_dereference(obj->fence_excl);
>> if (fence && !test_bit(DMA_FENCE_FLAG_SIGNALED_BIT, &fence->flags)) {
>> if (!dma_fence_get_rcu(fence))
>> goto unlock_retry;
>> @@ -503,6 +526,11 @@ long dma_resv_wait_timeout_rcu(struct dma_resv *obj,
>> }
>>
>> if (wait_all) {
>> + struct dma_resv_list *fobj = rcu_dereference(obj->fence);
>> +
>> + if (fobj)
>> + shared_count = fobj->shared_count;
>> +
>> for (i = 0; !fence && i < shared_count; ++i) {
>> struct dma_fence *lfence = rcu_dereference(fobj->shared[i]);
>>
>> @@ -525,6 +553,11 @@ long dma_resv_wait_timeout_rcu(struct dma_resv *obj,
>>
>> rcu_read_unlock();
>> if (fence) {
>> + if (read_seqcount_retry(&obj->seq, seq)) {
>> + dma_fence_put(fence);
>> + goto retry;
>> + }
>> +
>> ret = dma_fence_wait_timeout(fence, intr, ret);
>> dma_fence_put(fence);
>> if (ret > 0 && wait_all && (i + 1 < shared_count))
>> @@ -567,19 +600,23 @@ 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)
>> {
>> - struct dma_resv_list *fobj;
>> - struct dma_fence *fence_excl;
>> - unsigned shared_count;
>> + unsigned seq, shared_count;
>> int ret;
>>
>> rcu_read_lock();
>> retry:
>> ret = true;
>> + shared_count = 0;
>> + seq = read_seqcount_begin(&obj->seq);
>>
>> - dma_resv_fences(obj, &fence_excl, &fobj, &shared_count);
>> if (test_all) {
>> unsigned i;
>>
>> + struct dma_resv_list *fobj = rcu_dereference(obj->fence);
>> +
>> + if (fobj)
>> + shared_count = fobj->shared_count;
>> +
>> for (i = 0; i < shared_count; ++i) {
>> struct dma_fence *fence = rcu_dereference(fobj->shared[i]);
>>
>> @@ -589,14 +626,24 @@ bool dma_resv_test_signaled_rcu(struct dma_resv *obj, bool test_all)
>> else if (!ret)
>> break;
>> }
>> - }
>>
>> - if (!shared_count && fence_excl) {
>> - ret = dma_resv_test_signaled_single(fence_excl);
>> - if (ret < 0)
>> + if (read_seqcount_retry(&obj->seq, seq))
>> goto retry;
>> }
>>
>> + if (!shared_count) {
>> + struct dma_fence *fence_excl = rcu_dereference(obj->fence_excl);
>> +
>> + if (fence_excl) {
>> + ret = dma_resv_test_signaled_single(fence_excl);
>> + if (ret < 0)
>> + goto retry;
>> +
>> + if (read_seqcount_retry(&obj->seq, seq))
>> + goto retry;
>> + }
>> + }
>> +
>> rcu_read_unlock();
>> return ret;
>> }
>> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
>> index bc4ec6b20a87..76e3516484e7 100644
>> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
>> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
>> @@ -251,7 +251,12 @@ static int amdgpu_amdkfd_remove_eviction_fence(struct amdgpu_bo *bo,
>> new->shared_max = old->shared_max;
>> new->shared_count = k;
>>
>> - rcu_assign_pointer(resv->fence, new);
>> + /* Install the new fence list, seqcount provides the barriers */
>> + preempt_disable();
>> + write_seqcount_begin(&resv->seq);
>> + RCU_INIT_POINTER(resv->fence, new);
>> + write_seqcount_end(&resv->seq);
>> + preempt_enable();
>>
>> /* Drop the references to the removed fences or move them to ef_list */
>> for (i = j, k = 0; i < old->shared_count; ++i) {
>> diff --git a/drivers/gpu/drm/i915/gem/i915_gem_busy.c b/drivers/gpu/drm/i915/gem/i915_gem_busy.c
>> index a2aff1d8290e..3d4f5775a4ba 100644
>> --- a/drivers/gpu/drm/i915/gem/i915_gem_busy.c
>> +++ b/drivers/gpu/drm/i915/gem/i915_gem_busy.c
>> @@ -83,8 +83,7 @@ i915_gem_busy_ioctl(struct drm_device *dev, void *data,
>> struct drm_i915_gem_busy *args = data;
>> struct drm_i915_gem_object *obj;
>> struct dma_resv_list *list;
>> - unsigned int i, shared_count;
>> - struct dma_fence *excl;
>> + unsigned int seq;
>> int err;
>>
>> err = -ENOENT;
>> @@ -110,18 +109,29 @@ i915_gem_busy_ioctl(struct drm_device *dev, void *data,
>> * to report the overall busyness. This is what the wait-ioctl does.
>> *
>> */
>> - dma_resv_fences(obj->base.resv, &excl, &list, &shared_count);
>> +retry:
>> + seq = raw_read_seqcount(&obj->base.resv->seq);
>>
>> /* Translate the exclusive fence to the READ *and* WRITE engine */
>> - args->busy = busy_check_writer(excl);
>> + args->busy =
>> + busy_check_writer(rcu_dereference(obj->base.resv->fence_excl));
>>
>> /* Translate shared fences to READ set of engines */
>> - for (i = 0; i < shared_count; ++i) {
>> - struct dma_fence *fence = rcu_dereference(list->shared[i]);
>> + list = rcu_dereference(obj->base.resv->fence);
>> + if (list) {
>> + unsigned int shared_count = list->shared_count, i;
>>
>> - args->busy |= busy_check_reader(fence);
>> + for (i = 0; i < shared_count; ++i) {
>> + struct dma_fence *fence =
>> + rcu_dereference(list->shared[i]);
>> +
>> + args->busy |= busy_check_reader(fence);
>> + }
>> }
>>
>> + if (args->busy && read_seqcount_retry(&obj->base.resv->seq, seq))
>> + goto retry;
>> +
>> err = 0;
>> out:
>> rcu_read_unlock();
>> diff --git a/include/linux/dma-resv.h b/include/linux/dma-resv.h
>> index 38f2802afabb..ee50d10f052b 100644
>> --- a/include/linux/dma-resv.h
>> +++ b/include/linux/dma-resv.h
>> @@ -46,6 +46,8 @@
>> #include <linux/rcupdate.h>
>>
>> extern struct ww_class reservation_ww_class;
>> +extern struct lock_class_key reservation_seqcount_class;
>> +extern const char reservation_seqcount_string[];
>>
>> /**
>> * struct dma_resv_list - a list of shared fences
>> @@ -69,6 +71,7 @@ struct dma_resv_list {
>> */
>> struct dma_resv {
>> struct ww_mutex lock;
>> + seqcount_t seq;
>>
>> struct dma_fence __rcu *fence_excl;
>> struct dma_resv_list __rcu *fence;
>> @@ -77,24 +80,6 @@ struct dma_resv {
>> #define dma_resv_held(obj) lockdep_is_held(&(obj)->lock.base)
>> #define dma_resv_assert_held(obj) lockdep_assert_held(&(obj)->lock.base)
>>
>> -/**
>> - * dma_resv_get_excl - get the reservation object's
>> - * exclusive fence, with update-side lock held
>> - * @obj: the reservation object
>> - *
>> - * Returns the exclusive fence (if any). Does NOT take a
>> - * reference. Writers must hold obj->lock, readers may only
>> - * hold a RCU read side lock.
>> - *
>> - * RETURNS
>> - * The exclusive fence or NULL
>> - */
>> -static inline struct dma_fence *dma_resv_get_excl(struct dma_resv *obj)
>> -{
>> - return rcu_dereference_protected(obj->fence_excl,
>> - dma_resv_held(obj));
>> -}
>> -
>> /**
>> * dma_resv_get_list - get the reservation object's
>> * shared fence list, with update-side lock held
>> @@ -109,53 +94,6 @@ static inline struct dma_resv_list *dma_resv_get_list(struct dma_resv *obj)
>> dma_resv_held(obj));
>> }
>>
>> -/**
>> - * dma_resv_fences - read consistent fence pointers
>> - * @obj: reservation object where we get the fences from
>> - * @excl: pointer for the exclusive fence
>> - * @list: pointer for the shared fence list
>> - *
>> - * Make sure we have a consisten exclusive fence and shared fence list.
>> - * Must be called with rcu read side lock held.
>> - */
>> -static inline void dma_resv_fences(struct dma_resv *obj,
>> - struct dma_fence **excl,
>> - struct dma_resv_list **list,
>> - u32 *shared_count)
>> -{
>> - do {
>> - *excl = rcu_dereference(obj->fence_excl);
>> - *list = rcu_dereference(obj->fence);
>> - *shared_count = *list ? (*list)->shared_count : 0;
>> - smp_rmb(); /* See dma_resv_add_excl_fence */
>> - } while (rcu_access_pointer(obj->fence_excl) != *excl);
>> -}
>> -
>> -/**
>> - * dma_resv_get_excl_rcu - get the reservation object's
>> - * exclusive fence, without lock held.
>> - * @obj: the reservation object
>> - *
>> - * If there is an exclusive fence, this atomically increments it's
>> - * reference count and returns it.
>> - *
>> - * RETURNS
>> - * The exclusive fence or NULL if none
>> - */
>> -static inline struct dma_fence *dma_resv_get_excl_rcu(struct dma_resv *obj)
>> -{
>> - struct dma_fence *fence;
>> -
>> - if (!rcu_access_pointer(obj->fence_excl))
>> - return NULL;
>> -
>> - rcu_read_lock();
>> - fence = dma_fence_get_rcu_safe(&obj->fence_excl);
>> - rcu_read_unlock();
>> -
>> - return fence;
>> -}
>> -
>> /**
>> * dma_resv_lock - lock the reservation object
>> * @obj: the reservation object
>> @@ -290,6 +228,51 @@ static inline void dma_resv_unlock(struct dma_resv *obj)
>> ww_mutex_unlock(&obj->lock);
>> }
>>
>> +/**
>> + * dma_resv_get_excl - get the reservation object's
>> + * exclusive fence, with update-side lock held
>> + * @obj: the reservation object
>> + *
>> + * Returns the exclusive fence (if any). Does NOT take a
>> + * reference. Writers must hold obj->lock, readers may only
>> + * hold a RCU read side lock.
>> + *
>> + * RETURNS
>> + * The exclusive fence or NULL
>> + */
>> +static inline struct dma_fence *
>> +dma_resv_get_excl(struct dma_resv *obj)
>> +{
>> + return rcu_dereference_protected(obj->fence_excl,
>> + dma_resv_held(obj));
>> +}
>> +
>> +/**
>> + * dma_resv_get_excl_rcu - get the reservation object's
>> + * exclusive fence, without lock held.
>> + * @obj: the reservation object
>> + *
>> + * If there is an exclusive fence, this atomically increments it's
>> + * reference count and returns it.
>> + *
>> + * RETURNS
>> + * The exclusive fence or NULL if none
>> + */
>> +static inline struct dma_fence *
>> +dma_resv_get_excl_rcu(struct dma_resv *obj)
>> +{
>> + struct dma_fence *fence;
>> +
>> + if (!rcu_access_pointer(obj->fence_excl))
>> + return NULL;
>> +
>> + rcu_read_lock();
>> + fence = dma_fence_get_rcu_safe(&obj->fence_excl);
>> + rcu_read_unlock();
>> +
>> + return fence;
>> +}
>> +
>> void dma_resv_init(struct dma_resv *obj);
>> void dma_resv_fini(struct dma_resv *obj);
>> int dma_resv_reserve_shared(struct dma_resv *obj, unsigned int num_fences);
>> --
>> 2.23.0.rc1
>>
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