[PATCH 02/15] dma-buf: specify usage while adding fences to dma_resv obj v7

Christian König
2022-04-07T08:59:59Z

Instead of distingting between shared and exclusive fences specify
the fence usage while adding fences.

Rework all drivers to use this interface instead and deprecate the old one.

v2: some kerneldoc comments suggested by Daniel
v3: fix a missing case in radeon
v4: rebase on nouveau changes, fix lockdep and temporary disable warning
v5: more documentation updates
v6: separate internal dma_resv changes from this patch, avoids to
disable warning temporary, rebase on upstream changes
v7: fix missed case in lima driver, minimize changes to i915_gem_busy_ioctl

Signed-off-by: Christian König <christian.koenig@amd.com>
---
drivers/dma-buf/dma-resv.c | 48 +++++++--
drivers/dma-buf/st-dma-resv.c | 101 +++++-------------
.../gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c | 2 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 4 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 6 +-
drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c | 10 +-
drivers/gpu/drm/i915/gem/i915_gem_busy.c | 6 +-
drivers/gpu/drm/i915/gem/i915_gem_clflush.c | 3 +-
drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c | 5 +-
.../drm/i915/gem/selftests/i915_gem_migrate.c | 4 +-
.../drm/i915/gem/selftests/i915_gem_mman.c | 3 +-
drivers/gpu/drm/i915/i915_vma.c | 8 +-
.../drm/i915/selftests/intel_memory_region.c | 3 +-
drivers/gpu/drm/lima/lima_gem.c | 7 +-
drivers/gpu/drm/msm/msm_gem_submit.c | 6 +-
drivers/gpu/drm/nouveau/nouveau_bo.c | 9 +-
drivers/gpu/drm/nouveau/nouveau_fence.c | 4 +-
drivers/gpu/drm/panfrost/panfrost_job.c | 2 +-
drivers/gpu/drm/qxl/qxl_release.c | 3 +-
drivers/gpu/drm/radeon/radeon_object.c | 6 +-
drivers/gpu/drm/ttm/ttm_bo.c | 2 +-
drivers/gpu/drm/ttm/ttm_bo_util.c | 5 +-
drivers/gpu/drm/ttm/ttm_execbuf_util.c | 6 +-
drivers/gpu/drm/v3d/v3d_gem.c | 4 +-
drivers/gpu/drm/vc4/vc4_gem.c | 2 +-
drivers/gpu/drm/vgem/vgem_fence.c | 9 +-
drivers/gpu/drm/virtio/virtgpu_gem.c | 3 +-
drivers/gpu/drm/vmwgfx/vmwgfx_bo.c | 3 +-
include/linux/dma-buf.h | 16 +--
include/linux/dma-resv.h | 25 +++--
30 files changed, 149 insertions(+), 166 deletions(-)

diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c
index 17237e6ee30c..543dae6566d2 100644
--- a/drivers/dma-buf/dma-resv.c
+++ b/drivers/dma-buf/dma-resv.c
@@ -234,14 +234,14 @@ EXPORT_SYMBOL(dma_resv_reserve_fences);

#ifdef CONFIG_DEBUG_MUTEXES
/**
- * dma_resv_reset_shared_max - reset shared fences for debugging
+ * dma_resv_reset_max_fences - reset shared fences for debugging
* @obj: the dma_resv object to reset
*
* Reset the number of pre-reserved shared slots to test that drivers do
* correct slot allocation using dma_resv_reserve_fences(). See also
* &dma_resv_list.shared_max.
*/
-void dma_resv_reset_shared_max(struct dma_resv *obj)
+void dma_resv_reset_max_fences(struct dma_resv *obj)
{
struct dma_resv_list *fences = dma_resv_shared_list(obj);

@@ -251,7 +251,7 @@ void dma_resv_reset_shared_max(struct dma_resv *obj)
if (fences)
fences->shared_max = fences->shared_count;
}
-EXPORT_SYMBOL(dma_resv_reset_shared_max);
+EXPORT_SYMBOL(dma_resv_reset_max_fences);
#endif

/**
@@ -264,7 +264,8 @@ EXPORT_SYMBOL(dma_resv_reset_shared_max);
*
* See also &dma_resv.fence for a discussion of the semantics.
*/
-void dma_resv_add_shared_fence(struct dma_resv *obj, struct dma_fence *fence)
+static void dma_resv_add_shared_fence(struct dma_resv *obj,
+ struct dma_fence *fence)
{
struct dma_resv_list *fobj;
struct dma_fence *old;
@@ -305,13 +306,13 @@ void dma_resv_add_shared_fence(struct dma_resv *obj, struct dma_fence *fence)
write_seqcount_end(&obj->seq);
dma_fence_put(old);
}
-EXPORT_SYMBOL(dma_resv_add_shared_fence);

/**
* dma_resv_replace_fences - replace fences in the dma_resv obj
* @obj: the reservation object
* @context: the context of the fences to replace
* @replacement: the new fence to use instead
+ * @usage: how the new fence is used, see enum dma_resv_usage
*
* Replace fences with a specified context with a new fence. Only valid if the
* operation represented by the original fence has no longer access to the
@@ -321,12 +322,16 @@ EXPORT_SYMBOL(dma_resv_add_shared_fence);
* update fence which makes the resource inaccessible.
*/
void dma_resv_replace_fences(struct dma_resv *obj, uint64_t context,
- struct dma_fence *replacement)
+ struct dma_fence *replacement,
+ enum dma_resv_usage usage)
{
struct dma_resv_list *list;
struct dma_fence *old;
unsigned int i;

+ /* Only readers supported for now */
+ WARN_ON(usage != DMA_RESV_USAGE_READ);
+
dma_resv_assert_held(obj);

write_seqcount_begin(&obj->seq);
@@ -360,7 +365,8 @@ EXPORT_SYMBOL(dma_resv_replace_fences);
* Add a fence to the exclusive slot. @obj must be locked with dma_resv_lock().
* See also &dma_resv.fence_excl for a discussion of the semantics.
*/
-void dma_resv_add_excl_fence(struct dma_resv *obj, struct dma_fence *fence)
+static void dma_resv_add_excl_fence(struct dma_resv *obj,
+ struct dma_fence *fence)
{
struct dma_fence *old_fence = dma_resv_excl_fence(obj);

@@ -375,7 +381,27 @@ void dma_resv_add_excl_fence(struct dma_resv *obj, struct dma_fence *fence)

dma_fence_put(old_fence);
}
-EXPORT_SYMBOL(dma_resv_add_excl_fence);
+
+/**
+ * dma_resv_add_fence - Add a fence to the dma_resv obj
+ * @obj: the reservation object
+ * @fence: the fence to add
+ * @usage: how the fence is used, see enum dma_resv_usage
+ *
+ * Add a fence to a slot, @obj must be locked with dma_resv_lock(), and
+ * dma_resv_reserve_fences() has been called.
+ *
+ * See also &dma_resv.fence for a discussion of the semantics.
+ */
+void dma_resv_add_fence(struct dma_resv *obj, struct dma_fence *fence,
+ enum dma_resv_usage usage)
+{
+ if (usage == DMA_RESV_USAGE_WRITE)
+ dma_resv_add_excl_fence(obj, fence);
+ else
+ dma_resv_add_shared_fence(obj, fence);
+}
+EXPORT_SYMBOL(dma_resv_add_fence);

/* Restart the iterator by initializing all the necessary fields, but not the
* relation to the dma_resv object. */
@@ -574,7 +600,7 @@ int dma_resv_copy_fences(struct dma_resv *dst, struct dma_resv *src)
}

dma_fence_get(f);
- if (dma_resv_iter_is_exclusive(&cursor))
+ if (dma_resv_iter_usage(&cursor) == DMA_RESV_USAGE_WRITE)
excl = f;
else
RCU_INIT_POINTER(list->shared[list->shared_count++], f);
@@ -771,13 +797,13 @@ EXPORT_SYMBOL_GPL(dma_resv_test_signaled);
*/
void dma_resv_describe(struct dma_resv *obj, struct seq_file *seq)
{
+ static const char *usage[] = { "write", "read" };
struct dma_resv_iter cursor;
struct dma_fence *fence;

dma_resv_for_each_fence(&cursor, obj, DMA_RESV_USAGE_READ, fence) {
seq_printf(seq, "\t%s fence:",
- dma_resv_iter_is_exclusive(&cursor) ?
- "Exclusive" : "Shared");
+ usage[dma_resv_iter_usage(&cursor)]);
dma_fence_describe(fence, seq);
}
}
diff --git a/drivers/dma-buf/st-dma-resv.c b/drivers/dma-buf/st-dma-resv.c
index d097981061b1..d0f7c2bfd4f0 100644
--- a/drivers/dma-buf/st-dma-resv.c
+++ b/drivers/dma-buf/st-dma-resv.c
@@ -58,8 +58,9 @@ static int sanitycheck(void *arg)
return r;
}

-static int test_signaling(void *arg, enum dma_resv_usage usage)
+static int test_signaling(void *arg)
{
+ enum dma_resv_usage usage = (unsigned long)arg;
struct dma_resv resv;
struct dma_fence *f;
int r;
@@ -81,11 +82,7 @@ static int test_signaling(void *arg, enum dma_resv_usage usage)
goto err_unlock;
}

- if (usage >= DMA_RESV_USAGE_READ)
- dma_resv_add_shared_fence(&resv, f);
- else
- dma_resv_add_excl_fence(&resv, f);
-
+ dma_resv_add_fence(&resv, f, usage);
if (dma_resv_test_signaled(&resv, usage)) {
pr_err("Resv unexpectedly signaled\n");
r = -EINVAL;
@@ -105,18 +102,9 @@ static int test_signaling(void *arg, enum dma_resv_usage usage)
return r;
}

-static int test_excl_signaling(void *arg)
-{
- return test_signaling(arg, DMA_RESV_USAGE_WRITE);
-}
-
-static int test_shared_signaling(void *arg)
-{
- return test_signaling(arg, DMA_RESV_USAGE_READ);
-}
-
-static int test_for_each(void *arg, enum dma_resv_usage usage)
+static int test_for_each(void *arg)
{
+ enum dma_resv_usage usage = (unsigned long)arg;
struct dma_resv_iter cursor;
struct dma_fence *f, *fence;
struct dma_resv resv;
@@ -139,10 +127,7 @@ static int test_for_each(void *arg, enum dma_resv_usage usage)
goto err_unlock;
}

- if (usage >= DMA_RESV_USAGE_READ)
- dma_resv_add_shared_fence(&resv, f);
- else
- dma_resv_add_excl_fence(&resv, f);
+ dma_resv_add_fence(&resv, f, usage);

r = -ENOENT;
dma_resv_for_each_fence(&cursor, &resv, usage, fence) {
@@ -156,8 +141,7 @@ static int test_for_each(void *arg, enum dma_resv_usage usage)
r = -EINVAL;
goto err_unlock;
}
- if (dma_resv_iter_is_exclusive(&cursor) !=
- (usage >= DMA_RESV_USAGE_READ)) {
+ if (dma_resv_iter_usage(&cursor) != usage) {
pr_err("Unexpected fence usage\n");
r = -EINVAL;
goto err_unlock;
@@ -177,18 +161,9 @@ static int test_for_each(void *arg, enum dma_resv_usage usage)
return r;
}

-static int test_excl_for_each(void *arg)
-{
- return test_for_each(arg, DMA_RESV_USAGE_WRITE);
-}
-
-static int test_shared_for_each(void *arg)
-{
- return test_for_each(arg, DMA_RESV_USAGE_READ);
-}
-
-static int test_for_each_unlocked(void *arg, enum dma_resv_usage usage)
+static int test_for_each_unlocked(void *arg)
{
+ enum dma_resv_usage usage = (unsigned long)arg;
struct dma_resv_iter cursor;
struct dma_fence *f, *fence;
struct dma_resv resv;
@@ -212,10 +187,7 @@ static int test_for_each_unlocked(void *arg, enum dma_resv_usage usage)
goto err_free;
}

- if (usage >= DMA_RESV_USAGE_READ)
- dma_resv_add_shared_fence(&resv, f);
- else
- dma_resv_add_excl_fence(&resv, f);
+ dma_resv_add_fence(&resv, f, usage);
dma_resv_unlock(&resv);

r = -ENOENT;
@@ -235,8 +207,7 @@ static int test_for_each_unlocked(void *arg, enum dma_resv_usage usage)
r = -EINVAL;
goto err_iter_end;
}
- if (dma_resv_iter_is_exclusive(&cursor) !=
- (usage >= DMA_RESV_USAGE_READ)) {
+ if (dma_resv_iter_usage(&cursor) != usage) {
pr_err("Unexpected fence usage\n");
r = -EINVAL;
goto err_iter_end;
@@ -262,18 +233,9 @@ static int test_for_each_unlocked(void *arg, enum dma_resv_usage usage)
return r;
}

-static int test_excl_for_each_unlocked(void *arg)
-{
- return test_for_each_unlocked(arg, DMA_RESV_USAGE_WRITE);
-}
-
-static int test_shared_for_each_unlocked(void *arg)
-{
- return test_for_each_unlocked(arg, DMA_RESV_USAGE_READ);
-}
-
-static int test_get_fences(void *arg, enum dma_resv_usage usage)
+static int test_get_fences(void *arg)
{
+ enum dma_resv_usage usage = (unsigned long)arg;
struct dma_fence *f, **fences = NULL;
struct dma_resv resv;
int r, i;
@@ -296,10 +258,7 @@ static int test_get_fences(void *arg, enum dma_resv_usage usage)
goto err_resv;
}

- if (usage >= DMA_RESV_USAGE_READ)
- dma_resv_add_shared_fence(&resv, f);
- else
- dma_resv_add_excl_fence(&resv, f);
+ dma_resv_add_fence(&resv, f, usage);
dma_resv_unlock(&resv);

r = dma_resv_get_fences(&resv, usage, &i, &fences);
@@ -324,30 +283,24 @@ static int test_get_fences(void *arg, enum dma_resv_usage usage)
return r;
}

-static int test_excl_get_fences(void *arg)
-{
- return test_get_fences(arg, DMA_RESV_USAGE_WRITE);
-}
-
-static int test_shared_get_fences(void *arg)
-{
- return test_get_fences(arg, DMA_RESV_USAGE_READ);
-}
-
int dma_resv(void)
{
static const struct subtest tests[] = {
SUBTEST(sanitycheck),
- SUBTEST(test_excl_signaling),
- SUBTEST(test_shared_signaling),
- SUBTEST(test_excl_for_each),
- SUBTEST(test_shared_for_each),
- SUBTEST(test_excl_for_each_unlocked),
- SUBTEST(test_shared_for_each_unlocked),
- SUBTEST(test_excl_get_fences),
- SUBTEST(test_shared_get_fences),
+ SUBTEST(test_signaling),
+ SUBTEST(test_for_each),
+ SUBTEST(test_for_each_unlocked),
+ SUBTEST(test_get_fences),
};
+ enum dma_resv_usage usage;
+ int r;

spin_lock_init(&fence_lock);
- return subtests(tests, NULL);
+ for (usage = DMA_RESV_USAGE_WRITE; usage <= DMA_RESV_USAGE_READ;
+ ++usage) {
+ r = subtests(tests, (void *)(unsigned long)usage);
+ if (r)
+ return r;
+ }
+ return 0;
}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
index 98b1736bb221..5031e26e6716 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_amdkfd_gpuvm.c
@@ -263,7 +263,7 @@ static int amdgpu_amdkfd_remove_eviction_fence(struct amdgpu_bo *bo,
*/
replacement = dma_fence_get_stub();
dma_resv_replace_fences(bo->tbo.base.resv, ef->base.context,
- replacement);
+ replacement, DMA_RESV_USAGE_READ);
dma_fence_put(replacement);
return 0;
}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index 413f32c3fd63..76fd916424d6 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -55,8 +55,8 @@ static int amdgpu_cs_user_fence_chunk(struct amdgpu_cs_parser *p,
bo = amdgpu_bo_ref(gem_to_amdgpu_bo(gobj));
p->uf_entry.priority = 0;
p->uf_entry.tv.bo = &bo->tbo;
- /* One for TTM and one for the CS job */
- p->uf_entry.tv.num_shared = 2;
+ /* One for TTM and two for the CS job */
+ p->uf_entry.tv.num_shared = 3;

drm_gem_object_put(gobj);

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index a7f39f8ab7be..a3cdf8a24377 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -1397,10 +1397,8 @@ void amdgpu_bo_fence(struct amdgpu_bo *bo, struct dma_fence *fence,
return;
}

- if (shared)
- dma_resv_add_shared_fence(resv, fence);
- else
- dma_resv_add_excl_fence(resv, fence);
+ dma_resv_add_fence(resv, fence, shared ? DMA_RESV_USAGE_READ :
+ DMA_RESV_USAGE_WRITE);
}

/**
diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
index 53f7c78628a4..98bb5c9239de 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem_submit.c
@@ -202,14 +202,10 @@ static void submit_attach_object_fences(struct etnaviv_gem_submit *submit)

for (i = 0; i < submit->nr_bos; i++) {
struct drm_gem_object *obj = &submit->bos[i].obj->base;
+ bool write = submit->bos[i].flags & ETNA_SUBMIT_BO_WRITE;

- if (submit->bos[i].flags & ETNA_SUBMIT_BO_WRITE)
- dma_resv_add_excl_fence(obj->resv,
- submit->out_fence);
- else
- dma_resv_add_shared_fence(obj->resv,
- submit->out_fence);
-
+ dma_resv_add_fence(obj->resv, submit->out_fence, write ?
+ DMA_RESV_USAGE_WRITE : DMA_RESV_USAGE_READ);
submit_unlock_object(submit, i);
}
}
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_busy.c b/drivers/gpu/drm/i915/gem/i915_gem_busy.c
index 14a1c0ad8c3c..ddda468241ef 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_busy.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_busy.c
@@ -148,11 +148,11 @@ i915_gem_busy_ioctl(struct drm_device *dev, void *data,
if (dma_resv_iter_is_restarted(&cursor))
args->busy = 0;

- if (dma_resv_iter_is_exclusive(&cursor))
- /* Translate the exclusive fence to the READ *and* WRITE engine */
+ if (dma_resv_iter_usage(&cursor) <= DMA_RESV_USAGE_WRITE)
+ /* Translate the write fences to the READ *and* WRITE engine */
args->busy |= busy_check_writer(fence);
else
- /* Translate shared fences to READ set of engines */
+ /* Translate read fences to READ set of engines */
args->busy |= busy_check_reader(fence);
}
dma_resv_iter_end(&cursor);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_clflush.c b/drivers/gpu/drm/i915/gem/i915_gem_clflush.c
index 1fd0cc9ca213..f5f2b8b115ea 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_clflush.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_clflush.c
@@ -116,7 +116,8 @@ bool i915_gem_clflush_object(struct drm_i915_gem_object *obj,
obj->base.resv, NULL, true,
i915_fence_timeout(i915),
I915_FENCE_GFP);
- dma_resv_add_excl_fence(obj->base.resv, &clflush->base.dma);
+ dma_resv_add_fence(obj->base.resv, &clflush->base.dma,
+ DMA_RESV_USAGE_WRITE);
dma_fence_work_commit(&clflush->base);
/*
* We must have successfully populated the pages(since we are
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c b/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c
index 432ac74ff225..438b8a95b3d1 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_ttm_move.c
@@ -637,9 +637,8 @@ int i915_gem_obj_copy_ttm(struct drm_i915_gem_object *dst,
if (IS_ERR_OR_NULL(copy_fence))
return PTR_ERR_OR_ZERO(copy_fence);

- dma_resv_add_excl_fence(dst_bo->base.resv, copy_fence);
- dma_resv_add_shared_fence(src_bo->base.resv, copy_fence);
-
+ dma_resv_add_fence(dst_bo->base.resv, copy_fence, DMA_RESV_USAGE_WRITE);
+ dma_resv_add_fence(src_bo->base.resv, copy_fence, DMA_RESV_USAGE_READ);
dma_fence_put(copy_fence);

return 0;
diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_migrate.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_migrate.c
index 0e52eb87cd55..4997ed18b6e4 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_migrate.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_migrate.c
@@ -218,8 +218,8 @@ static int __igt_lmem_pages_migrate(struct intel_gt *gt,
if (rq) {
err = dma_resv_reserve_fences(obj->base.resv, 1);
if (!err)
- dma_resv_add_excl_fence(obj->base.resv,
- &rq->fence);
+ dma_resv_add_fence(obj->base.resv, &rq->fence,
+ DMA_RESV_USAGE_WRITE);
i915_gem_object_set_moving_fence(obj, &rq->fence);
i915_request_put(rq);
}
diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
index a132e241c3ee..3a6e3f6d239f 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_mman.c
@@ -1220,7 +1220,8 @@ static int __igt_mmap_migrate(struct intel_memory_region **placements,
expand32(POISON_INUSE), &rq);
i915_gem_object_unpin_pages(obj);
if (rq) {
- dma_resv_add_excl_fence(obj->base.resv, &rq->fence);
+ dma_resv_add_fence(obj->base.resv, &rq->fence,
+ DMA_RESV_USAGE_WRITE);
i915_gem_object_set_moving_fence(obj, &rq->fence);
i915_request_put(rq);
}
diff --git a/drivers/gpu/drm/i915/i915_vma.c b/drivers/gpu/drm/i915/i915_vma.c
index bae3423f58e8..524477d8939e 100644
--- a/drivers/gpu/drm/i915/i915_vma.c
+++ b/drivers/gpu/drm/i915/i915_vma.c
@@ -1826,7 +1826,8 @@ int _i915_vma_move_to_active(struct i915_vma *vma,
}

if (fence) {
- dma_resv_add_excl_fence(vma->obj->base.resv, fence);
+ dma_resv_add_fence(vma->obj->base.resv, fence,
+ DMA_RESV_USAGE_WRITE);
obj->write_domain = I915_GEM_DOMAIN_RENDER;
obj->read_domains = 0;
}
@@ -1838,7 +1839,8 @@ int _i915_vma_move_to_active(struct i915_vma *vma,
}

if (fence) {
- dma_resv_add_shared_fence(vma->obj->base.resv, fence);
+ dma_resv_add_fence(vma->obj->base.resv, fence,
+ DMA_RESV_USAGE_READ);
obj->write_domain = 0;
}
}
@@ -2078,7 +2080,7 @@ int i915_vma_unbind_async(struct i915_vma *vma, bool trylock_vm)
goto out_rpm;
}

- dma_resv_add_shared_fence(obj->base.resv, fence);
+ dma_resv_add_fence(obj->base.resv, fence, DMA_RESV_USAGE_READ);
dma_fence_put(fence);

out_rpm:
diff --git a/drivers/gpu/drm/i915/selftests/intel_memory_region.c b/drivers/gpu/drm/i915/selftests/intel_memory_region.c
index 6114e013092b..73eb53edb8de 100644
--- a/drivers/gpu/drm/i915/selftests/intel_memory_region.c
+++ b/drivers/gpu/drm/i915/selftests/intel_memory_region.c
@@ -1056,7 +1056,8 @@ static int igt_lmem_write_cpu(void *arg)
obj->mm.pages->sgl, I915_CACHE_NONE,
true, 0xdeadbeaf, &rq);
if (rq) {
- dma_resv_add_excl_fence(obj->base.resv, &rq->fence);
+ dma_resv_add_fence(obj->base.resv, &rq->fence,
+ DMA_RESV_USAGE_WRITE);
i915_request_put(rq);
}

diff --git a/drivers/gpu/drm/lima/lima_gem.c b/drivers/gpu/drm/lima/lima_gem.c
index e0a11ee0e86d..0f1ca0b0db49 100644
--- a/drivers/gpu/drm/lima/lima_gem.c
+++ b/drivers/gpu/drm/lima/lima_gem.c
@@ -364,10 +364,9 @@ int lima_gem_submit(struct drm_file *file, struct lima_submit *submit)
fence = lima_sched_context_queue_task(submit->task);

for (i = 0; i < submit->nr_bos; i++) {
- if (submit->bos[i].flags & LIMA_SUBMIT_BO_WRITE)
- dma_resv_add_excl_fence(lima_bo_resv(bos[i]), fence);
- else
- dma_resv_add_shared_fence(lima_bo_resv(bos[i]), fence);
+ dma_resv_add_fence(lima_bo_resv(bos[i]), fence,
+ submit->bos[i].flags & LIMA_SUBMIT_BO_WRITE ?
+ DMA_RESV_USAGE_WRITE : DMA_RESV_USAGE_READ);
}

drm_gem_unlock_reservations((struct drm_gem_object **)bos,
diff --git a/drivers/gpu/drm/msm/msm_gem_submit.c b/drivers/gpu/drm/msm/msm_gem_submit.c
index 3164db8be893..8d1eef914ba8 100644
--- a/drivers/gpu/drm/msm/msm_gem_submit.c
+++ b/drivers/gpu/drm/msm/msm_gem_submit.c
@@ -395,9 +395,11 @@ static void submit_attach_object_fences(struct msm_gem_submit *submit)
struct drm_gem_object *obj = &submit->bos[i].obj->base;

if (submit->bos[i].flags & MSM_SUBMIT_BO_WRITE)
- dma_resv_add_excl_fence(obj->resv, submit->user_fence);
+ dma_resv_add_fence(obj->resv, submit->user_fence,
+ DMA_RESV_USAGE_WRITE);
else if (submit->bos[i].flags & MSM_SUBMIT_BO_READ)
- dma_resv_add_shared_fence(obj->resv, submit->user_fence);
+ dma_resv_add_fence(obj->resv, submit->user_fence,
+ DMA_RESV_USAGE_READ);
}
}

diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index c6bb4dbcd735..05076e530e7d 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -1308,10 +1308,11 @@ nouveau_bo_fence(struct nouveau_bo *nvbo, struct nouveau_fence *fence, bool excl
{
struct dma_resv *resv = nvbo->bo.base.resv;

- if (exclusive)
- dma_resv_add_excl_fence(resv, &fence->base);
- else if (fence)
- dma_resv_add_shared_fence(resv, &fence->base);
+ if (!fence)
+ return;
+
+ dma_resv_add_fence(resv, &fence->base, exclusive ?
+ DMA_RESV_USAGE_WRITE : DMA_RESV_USAGE_READ);
}

static void
diff --git a/drivers/gpu/drm/nouveau/nouveau_fence.c b/drivers/gpu/drm/nouveau/nouveau_fence.c
index d5e81ccee01c..7f01dcf81fab 100644
--- a/drivers/gpu/drm/nouveau/nouveau_fence.c
+++ b/drivers/gpu/drm/nouveau/nouveau_fence.c
@@ -360,9 +360,11 @@ nouveau_fence_sync(struct nouveau_bo *nvbo, struct nouveau_channel *chan,
dma_resv_for_each_fence(&cursor, resv,
dma_resv_usage_rw(exclusive),
fence) {
+ enum dma_resv_usage usage;
struct nouveau_fence *f;

- if (i == 0 && dma_resv_iter_is_exclusive(&cursor))
+ usage = dma_resv_iter_usage(&cursor);
+ if (i == 0 && usage == DMA_RESV_USAGE_WRITE)
continue;

f = nouveau_local_fence(fence, chan->drm);
diff --git a/drivers/gpu/drm/panfrost/panfrost_job.c b/drivers/gpu/drm/panfrost/panfrost_job.c
index c34114560e49..fda5871aebe3 100644
--- a/drivers/gpu/drm/panfrost/panfrost_job.c
+++ b/drivers/gpu/drm/panfrost/panfrost_job.c
@@ -268,7 +268,7 @@ static void panfrost_attach_object_fences(struct drm_gem_object **bos,
int i;

for (i = 0; i < bo_count; i++)
- dma_resv_add_excl_fence(bos[i]->resv, fence);
+ dma_resv_add_fence(bos[i]->resv, fence, DMA_RESV_USAGE_WRITE);
}

int panfrost_job_push(struct panfrost_job *job)
diff --git a/drivers/gpu/drm/qxl/qxl_release.c b/drivers/gpu/drm/qxl/qxl_release.c
index cde1e8ddaeaa..368d26da0d6a 100644
--- a/drivers/gpu/drm/qxl/qxl_release.c
+++ b/drivers/gpu/drm/qxl/qxl_release.c
@@ -429,7 +429,8 @@ void qxl_release_fence_buffer_objects(struct qxl_release *release)
list_for_each_entry(entry, &release->bos, head) {
bo = entry->bo;

- dma_resv_add_shared_fence(bo->base.resv, &release->base);
+ dma_resv_add_fence(bo->base.resv, &release->base,
+ DMA_RESV_USAGE_READ);
ttm_bo_move_to_lru_tail_unlocked(bo);
dma_resv_unlock(bo->base.resv);
}
diff --git a/drivers/gpu/drm/radeon/radeon_object.c b/drivers/gpu/drm/radeon/radeon_object.c
index 7ffd2e90f325..cb5c4aa45cef 100644
--- a/drivers/gpu/drm/radeon/radeon_object.c
+++ b/drivers/gpu/drm/radeon/radeon_object.c
@@ -791,8 +791,6 @@ void radeon_bo_fence(struct radeon_bo *bo, struct radeon_fence *fence,
return;
}

- if (shared)
- dma_resv_add_shared_fence(resv, &fence->base);
- else
- dma_resv_add_excl_fence(resv, &fence->base);
+ dma_resv_add_fence(resv, &fence->base, shared ?
+ DMA_RESV_USAGE_READ : DMA_RESV_USAGE_WRITE);
}
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index cff05b62f3f7..d74f9eea855e 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -739,7 +739,7 @@ static int ttm_bo_add_move_fence(struct ttm_buffer_object *bo,
return ret;
}

- dma_resv_add_shared_fence(bo->base.resv, fence);
+ dma_resv_add_fence(bo->base.resv, fence, DMA_RESV_USAGE_WRITE);

ret = dma_resv_reserve_fences(bo->base.resv, 1);
if (unlikely(ret)) {
diff --git a/drivers/gpu/drm/ttm/ttm_bo_util.c b/drivers/gpu/drm/ttm/ttm_bo_util.c
index 1b96b91bf81b..7a96a1db13a7 100644
--- a/drivers/gpu/drm/ttm/ttm_bo_util.c
+++ b/drivers/gpu/drm/ttm/ttm_bo_util.c
@@ -507,7 +507,8 @@ static int ttm_bo_move_to_ghost(struct ttm_buffer_object *bo,
if (ret)
return ret;

- dma_resv_add_excl_fence(&ghost_obj->base._resv, fence);
+ dma_resv_add_fence(&ghost_obj->base._resv, fence,
+ DMA_RESV_USAGE_WRITE);

/**
* If we're not moving to fixed memory, the TTM object
@@ -561,7 +562,7 @@ int ttm_bo_move_accel_cleanup(struct ttm_buffer_object *bo,
struct ttm_resource_manager *man = ttm_manager_type(bdev, new_mem->mem_type);
int ret = 0;

- dma_resv_add_excl_fence(bo->base.resv, fence);
+ dma_resv_add_fence(bo->base.resv, fence, DMA_RESV_USAGE_WRITE);
if (!evict)
ret = ttm_bo_move_to_ghost(bo, fence, man->use_tt);
else if (!from->use_tt && pipeline)
diff --git a/drivers/gpu/drm/ttm/ttm_execbuf_util.c b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
index 789c645f004e..0eb995d25df1 100644
--- a/drivers/gpu/drm/ttm/ttm_execbuf_util.c
+++ b/drivers/gpu/drm/ttm/ttm_execbuf_util.c
@@ -154,10 +154,8 @@ void ttm_eu_fence_buffer_objects(struct ww_acquire_ctx *ticket,
list_for_each_entry(entry, list, head) {
struct ttm_buffer_object *bo = entry->bo;

- if (entry->num_shared)
- dma_resv_add_shared_fence(bo->base.resv, fence);
- else
- dma_resv_add_excl_fence(bo->base.resv, fence);
+ dma_resv_add_fence(bo->base.resv, fence, entry->num_shared ?
+ DMA_RESV_USAGE_READ : DMA_RESV_USAGE_WRITE);
ttm_bo_move_to_lru_tail_unlocked(bo);
dma_resv_unlock(bo->base.resv);
}
diff --git a/drivers/gpu/drm/v3d/v3d_gem.c b/drivers/gpu/drm/v3d/v3d_gem.c
index 961812d33827..2352e9640922 100644
--- a/drivers/gpu/drm/v3d/v3d_gem.c
+++ b/drivers/gpu/drm/v3d/v3d_gem.c
@@ -550,8 +550,8 @@ v3d_attach_fences_and_unlock_reservation(struct drm_file *file_priv,

for (i = 0; i < job->bo_count; i++) {
/* XXX: Use shared fences for read-only objects. */
- dma_resv_add_excl_fence(job->bo[i]->resv,
- job->done_fence);
+ dma_resv_add_fence(job->bo[i]->resv, job->done_fence,
+ DMA_RESV_USAGE_WRITE);
}

drm_gem_unlock_reservations(job->bo, job->bo_count, acquire_ctx);
diff --git a/drivers/gpu/drm/vc4/vc4_gem.c b/drivers/gpu/drm/vc4/vc4_gem.c
index 594bd6bb00d2..38550317e025 100644
--- a/drivers/gpu/drm/vc4/vc4_gem.c
+++ b/drivers/gpu/drm/vc4/vc4_gem.c
@@ -546,7 +546,7 @@ vc4_update_bo_seqnos(struct vc4_exec_info *exec, uint64_t seqno)
bo = to_vc4_bo(&exec->bo[i]->base);
bo->seqno = seqno;

- dma_resv_add_shared_fence(bo->base.base.resv, exec->fence);
+ dma_resv_add_fence(bo->base.base.resv, exec->fence);
}

list_for_each_entry(bo, &exec->unref_list, unref_head) {
diff --git a/drivers/gpu/drm/vgem/vgem_fence.c b/drivers/gpu/drm/vgem/vgem_fence.c
index 91fc4940c65a..c2a879734d40 100644
--- a/drivers/gpu/drm/vgem/vgem_fence.c
+++ b/drivers/gpu/drm/vgem/vgem_fence.c
@@ -161,12 +161,9 @@ int vgem_fence_attach_ioctl(struct drm_device *dev,
/* Expose the fence via the dma-buf */
dma_resv_lock(resv, NULL);
ret = dma_resv_reserve_fences(resv, 1);
- if (!ret) {
- if (arg->flags & VGEM_FENCE_WRITE)
- dma_resv_add_excl_fence(resv, fence);
- else
- dma_resv_add_shared_fence(resv, fence);
- }
+ if (!ret)
+ dma_resv_add_fence(resv, fence, arg->flags & VGEM_FENCE_WRITE ?
+ DMA_RESV_USAGE_WRITE : DMA_RESV_USAGE_READ);
dma_resv_unlock(resv);

/* Record the fence in our idr for later signaling */
diff --git a/drivers/gpu/drm/virtio/virtgpu_gem.c b/drivers/gpu/drm/virtio/virtgpu_gem.c
index 1820ca6cf673..580a78809836 100644
--- a/drivers/gpu/drm/virtio/virtgpu_gem.c
+++ b/drivers/gpu/drm/virtio/virtgpu_gem.c
@@ -250,7 +250,8 @@ void virtio_gpu_array_add_fence(struct virtio_gpu_object_array *objs,
int i;

for (i = 0; i < objs->nents; i++)
- dma_resv_add_excl_fence(objs->objs[i]->resv, fence);
+ dma_resv_add_fence(objs->objs[i]->resv, fence,
+ DMA_RESV_USAGE_WRITE);
}

void virtio_gpu_array_put_free(struct virtio_gpu_object_array *objs)
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
index b96884f7d03d..bec50223efe5 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
@@ -758,7 +758,8 @@ void vmw_bo_fence_single(struct ttm_buffer_object *bo,

ret = dma_resv_reserve_fences(bo->base.resv, 1);
if (!ret)
- dma_resv_add_excl_fence(bo->base.resv, &fence->base);
+ dma_resv_add_fence(bo->base.resv, &fence->base,
+ DMA_RESV_USAGE_WRITE);
else
/* Last resort fallback when we are OOM */
dma_fence_wait(&fence->base, false);
diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
index a297397743a2..71731796c8c3 100644
--- a/include/linux/dma-buf.h
+++ b/include/linux/dma-buf.h
@@ -393,15 +393,15 @@ struct dma_buf {
* e.g. exposed in `Implicit Fence Poll Support`_ must follow the
* below rules.
*
- * - Drivers must add a shared fence through dma_resv_add_shared_fence()
- * for anything the userspace API considers a read access. This highly
- * depends upon the API and window system.
+ * - Drivers must add a read fence through dma_resv_add_fence() with the
+ * DMA_RESV_USAGE_READ flag for anything the userspace API considers a
+ * read access. This highly depends upon the API and window system.
*
- * - Similarly drivers must set the exclusive fence through
- * dma_resv_add_excl_fence() for anything the userspace API considers
- * write access.
+ * - Similarly drivers must add a write fence through
+ * dma_resv_add_fence() with the DMA_RESV_USAGE_WRITE flag for
+ * anything the userspace API considers write access.
*
- * - Drivers may just always set the exclusive fence, since that only
+ * - Drivers may just always add a write fence, since that only
* causes unecessarily synchronization, but no correctness issues.
*
* - Some drivers only expose a synchronous userspace API with no
@@ -416,7 +416,7 @@ struct dma_buf {
* Dynamic importers, see dma_buf_attachment_is_dynamic(), have
* additional constraints on how they set up fences:
*
- * - Dynamic importers must obey the exclusive fence and wait for it to
+ * - Dynamic importers must obey the write fences and wait for them to
* signal before allowing access to the buffer's underlying storage
* through the device.
*
diff --git a/include/linux/dma-resv.h b/include/linux/dma-resv.h
index 92cd8023980f..98dc5234b487 100644
--- a/include/linux/dma-resv.h
+++ b/include/linux/dma-resv.h
@@ -195,6 +195,9 @@ struct dma_resv_iter {
/** @fence: the currently handled fence */
struct dma_fence *fence;

+ /** @fence_usage: the usage of the current fence */
+ enum dma_resv_usage fence_usage;
+
/** @seq: sequence number to check for modifications */
unsigned int seq;

@@ -244,14 +247,15 @@ static inline void dma_resv_iter_end(struct dma_resv_iter *cursor)
}

/**
- * dma_resv_iter_is_exclusive - test if the current fence is the exclusive one
+ * dma_resv_iter_usage - Return the usage of the current fence
* @cursor: the cursor of the current position
*
- * Returns true if the currently returned fence is the exclusive one.
+ * Returns the usage of the currently processed fence.
*/
-static inline bool dma_resv_iter_is_exclusive(struct dma_resv_iter *cursor)
+static inline enum dma_resv_usage
+dma_resv_iter_usage(struct dma_resv_iter *cursor)
{
- return cursor->index == 0;
+ return cursor->fence_usage;
}

/**
@@ -306,9 +310,9 @@ static inline bool dma_resv_iter_is_restarted(struct dma_resv_iter *cursor)
#define dma_resv_assert_held(obj) lockdep_assert_held(&(obj)->lock.base)

#ifdef CONFIG_DEBUG_MUTEXES
-void dma_resv_reset_shared_max(struct dma_resv *obj);
+void dma_resv_reset_max_fences(struct dma_resv *obj);
#else
-static inline void dma_resv_reset_shared_max(struct dma_resv *obj) {}
+static inline void dma_resv_reset_max_fences(struct dma_resv *obj) {}
#endif

/**
@@ -454,17 +458,18 @@ static inline struct ww_acquire_ctx *dma_resv_locking_ctx(struct dma_resv *obj)
*/
static inline void dma_resv_unlock(struct dma_resv *obj)
{
- dma_resv_reset_shared_max(obj);
+ dma_resv_reset_max_fences(obj);
ww_mutex_unlock(&obj->lock);
}

void dma_resv_init(struct dma_resv *obj);
void dma_resv_fini(struct dma_resv *obj);
int dma_resv_reserve_fences(struct dma_resv *obj, unsigned int num_fences);
-void dma_resv_add_shared_fence(struct dma_resv *obj, struct dma_fence *fence);
+void dma_resv_add_fence(struct dma_resv *obj, struct dma_fence *fence,
+ enum dma_resv_usage usage);
void dma_resv_replace_fences(struct dma_resv *obj, uint64_t context,
- struct dma_fence *fence);
-void dma_resv_add_excl_fence(struct dma_resv *obj, struct dma_fence *fence);
+ struct dma_fence *fence,
+ enum dma_resv_usage usage);
int dma_resv_get_fences(struct dma_resv *obj, enum dma_resv_usage usage,
unsigned int *num_fences, struct dma_fence ***fences);
int dma_resv_get_singleton(struct dma_resv *obj, enum dma_resv_usage usage,
--
2.25.1