[PATCH 01/15] dma-buf: add enum dma_resv_usage v4

Christian König
2022-04-07T08:59:58Z

This change adds the dma_resv_usage enum and allows us to specify why a
dma_resv object is queried for its containing fences.

Additional to that a dma_resv_usage_rw() helper function is added to aid
retrieving the fences for a read or write userspace submission.

This is then deployed to the different query functions of the dma_resv
object and all of their users. When the write paratermer was previously
true we now use DMA_RESV_USAGE_WRITE and DMA_RESV_USAGE_READ otherwise.

v2: add KERNEL/OTHER in separate patch
v3: some kerneldoc suggestions by Daniel
v4: some more kerneldoc suggestions by Daniel, fix missing cases lost in
the rebase pointed out by Bas.

Signed-off-by: Christian König <christian.koenig@amd.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
---
drivers/dma-buf/dma-buf.c | 6 +-
drivers/dma-buf/dma-resv.c | 35 +++++----
drivers/dma-buf/st-dma-resv.c | 48 ++++++------
drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c | 4 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_display.c | 3 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c | 3 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c | 5 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c | 4 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_object.c | 4 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c | 3 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c | 3 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c | 3 +-
drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 7 +-
.../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 3 +-
drivers/gpu/drm/drm_gem.c | 3 +-
drivers/gpu/drm/drm_gem_atomic_helper.c | 2 +-
drivers/gpu/drm/etnaviv/etnaviv_gem.c | 6 +-
.../gpu/drm/i915/display/intel_atomic_plane.c | 3 +-
drivers/gpu/drm/i915/gem/i915_gem_busy.c | 4 +-
drivers/gpu/drm/i915/gem/i915_gem_lmem.c | 2 +-
drivers/gpu/drm/i915/gem/i915_gem_userptr.c | 2 +-
drivers/gpu/drm/i915/gem/i915_gem_wait.c | 6 +-
.../drm/i915/gem/selftests/i915_gem_dmabuf.c | 3 +-
drivers/gpu/drm/i915/i915_request.c | 3 +-
drivers/gpu/drm/i915/i915_sw_fence.c | 2 +-
drivers/gpu/drm/msm/msm_gem.c | 3 +-
drivers/gpu/drm/nouveau/dispnv50/wndw.c | 3 +-
drivers/gpu/drm/nouveau/nouveau_bo.c | 8 +-
drivers/gpu/drm/nouveau/nouveau_fence.c | 8 +-
drivers/gpu/drm/nouveau/nouveau_gem.c | 3 +-
drivers/gpu/drm/panfrost/panfrost_drv.c | 3 +-
drivers/gpu/drm/qxl/qxl_debugfs.c | 3 +-
drivers/gpu/drm/radeon/radeon_display.c | 3 +-
drivers/gpu/drm/radeon/radeon_gem.c | 9 ++-
drivers/gpu/drm/radeon/radeon_mn.c | 4 +-
drivers/gpu/drm/radeon/radeon_sync.c | 2 +-
drivers/gpu/drm/radeon/radeon_uvd.c | 4 +-
drivers/gpu/drm/scheduler/sched_main.c | 3 +-
drivers/gpu/drm/ttm/ttm_bo.c | 18 +++--
drivers/gpu/drm/vgem/vgem_fence.c | 4 +-
drivers/gpu/drm/virtio/virtgpu_ioctl.c | 5 +-
drivers/gpu/drm/vmwgfx/vmwgfx_bo.c | 4 +-
drivers/gpu/drm/vmwgfx/vmwgfx_resource.c | 3 +-
drivers/infiniband/core/umem_dmabuf.c | 3 +-
include/linux/dma-buf.h | 8 +-
include/linux/dma-resv.h | 73 +++++++++++++++----
46 files changed, 215 insertions(+), 126 deletions(-)

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 775d3afb4169..1cddb65eafda 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -216,7 +216,8 @@ static bool dma_buf_poll_add_cb(struct dma_resv *resv, bool write,
struct dma_fence *fence;
int r;

- dma_resv_for_each_fence(&cursor, resv, write, fence) {
+ dma_resv_for_each_fence(&cursor, resv, dma_resv_usage_rw(write),
+ fence) {
dma_fence_get(fence);
r = dma_fence_add_callback(fence, &dcb->cb, dma_buf_poll_cb);
if (!r)
@@ -1124,7 +1125,8 @@ static int __dma_buf_begin_cpu_access(struct dma_buf *dmabuf,
long ret;

/* Wait on any implicit rendering fences */
- ret = dma_resv_wait_timeout(resv, write, true, MAX_SCHEDULE_TIMEOUT);
+ ret = dma_resv_wait_timeout(resv, dma_resv_usage_rw(write),
+ true, MAX_SCHEDULE_TIMEOUT);
if (ret < 0)
return ret;

diff --git a/drivers/dma-buf/dma-resv.c b/drivers/dma-buf/dma-resv.c
index 8c650b96357a..17237e6ee30c 100644
--- a/drivers/dma-buf/dma-resv.c
+++ b/drivers/dma-buf/dma-resv.c
@@ -384,7 +384,7 @@ static void dma_resv_iter_restart_unlocked(struct dma_resv_iter *cursor)
cursor->seq = read_seqcount_begin(&cursor->obj->seq);
cursor->index = -1;
cursor->shared_count = 0;
- if (cursor->all_fences) {
+ if (cursor->usage >= DMA_RESV_USAGE_READ) {
cursor->fences = dma_resv_shared_list(cursor->obj);
if (cursor->fences)
cursor->shared_count = cursor->fences->shared_count;
@@ -496,7 +496,7 @@ struct dma_fence *dma_resv_iter_first(struct dma_resv_iter *cursor)
dma_resv_assert_held(cursor->obj);

cursor->index = 0;
- if (cursor->all_fences)
+ if (cursor->usage >= DMA_RESV_USAGE_READ)
cursor->fences = dma_resv_shared_list(cursor->obj);
else
cursor->fences = NULL;
@@ -551,7 +551,7 @@ int dma_resv_copy_fences(struct dma_resv *dst, struct dma_resv *src)
list = NULL;
excl = NULL;

- dma_resv_iter_begin(&cursor, src, true);
+ dma_resv_iter_begin(&cursor, src, DMA_RESV_USAGE_READ);
dma_resv_for_each_fence_unlocked(&cursor, f) {

if (dma_resv_iter_is_restarted(&cursor)) {
@@ -597,7 +597,7 @@ EXPORT_SYMBOL(dma_resv_copy_fences);
* dma_resv_get_fences - Get an object's shared and exclusive
* fences without update side lock held
* @obj: the reservation object
- * @write: true if we should return all fences
+ * @usage: controls which fences to include, see enum dma_resv_usage.
* @num_fences: the number of fences returned
* @fences: the array of fence ptrs returned (array is krealloc'd to the
* required size, and must be freed by caller)
@@ -605,7 +605,7 @@ EXPORT_SYMBOL(dma_resv_copy_fences);
* Retrieve all fences from the reservation object.
* Returns either zero or -ENOMEM.
*/
-int dma_resv_get_fences(struct dma_resv *obj, bool write,
+int dma_resv_get_fences(struct dma_resv *obj, enum dma_resv_usage usage,
unsigned int *num_fences, struct dma_fence ***fences)
{
struct dma_resv_iter cursor;
@@ -614,7 +614,7 @@ int dma_resv_get_fences(struct dma_resv *obj, bool write,
*num_fences = 0;
*fences = NULL;

- dma_resv_iter_begin(&cursor, obj, write);
+ dma_resv_iter_begin(&cursor, obj, usage);
dma_resv_for_each_fence_unlocked(&cursor, fence) {

if (dma_resv_iter_is_restarted(&cursor)) {
@@ -646,7 +646,7 @@ EXPORT_SYMBOL_GPL(dma_resv_get_fences);
/**
* dma_resv_get_singleton - Get a single fence for all the fences
* @obj: the reservation object
- * @write: true if we should return all fences
+ * @usage: controls which fences to include, see enum dma_resv_usage.
* @fence: the resulting fence
*
* Get a single fence representing all the fences inside the resv object.
@@ -658,7 +658,7 @@ EXPORT_SYMBOL_GPL(dma_resv_get_fences);
*
* Returns 0 on success and negative error values on failure.
*/
-int dma_resv_get_singleton(struct dma_resv *obj, bool write,
+int dma_resv_get_singleton(struct dma_resv *obj, enum dma_resv_usage usage,
struct dma_fence **fence)
{
struct dma_fence_array *array;
@@ -666,7 +666,7 @@ int dma_resv_get_singleton(struct dma_resv *obj, bool write,
unsigned count;
int r;

- r = dma_resv_get_fences(obj, write, &count, &fences);
+ r = dma_resv_get_fences(obj, usage, &count, &fences);
if (r)
return r;

@@ -700,7 +700,7 @@ EXPORT_SYMBOL_GPL(dma_resv_get_singleton);
* dma_resv_wait_timeout - Wait on reservation's objects
* shared and/or exclusive fences.
* @obj: the reservation object
- * @wait_all: if true, wait on all fences, else wait on just exclusive fence
+ * @usage: controls which fences to include, see enum dma_resv_usage.
* @intr: if true, do interruptible wait
* @timeout: timeout value in jiffies or zero to return immediately
*
@@ -710,14 +710,14 @@ EXPORT_SYMBOL_GPL(dma_resv_get_singleton);
* Returns -ERESTARTSYS if interrupted, 0 if the wait timed out, or
* greater than zer on success.
*/
-long dma_resv_wait_timeout(struct dma_resv *obj, bool wait_all, bool intr,
- unsigned long timeout)
+long dma_resv_wait_timeout(struct dma_resv *obj, enum dma_resv_usage usage,
+ bool intr, unsigned long timeout)
{
long ret = timeout ? timeout : 1;
struct dma_resv_iter cursor;
struct dma_fence *fence;

- dma_resv_iter_begin(&cursor, obj, wait_all);
+ dma_resv_iter_begin(&cursor, obj, usage);
dma_resv_for_each_fence_unlocked(&cursor, fence) {

ret = dma_fence_wait_timeout(fence, intr, ret);
@@ -737,8 +737,7 @@ EXPORT_SYMBOL_GPL(dma_resv_wait_timeout);
* dma_resv_test_signaled - Test if a reservation object's fences have been
* signaled.
* @obj: the reservation object
- * @test_all: if true, test all fences, otherwise only test the exclusive
- * fence
+ * @usage: controls which fences to include, see enum dma_resv_usage.
*
* Callers are not required to hold specific locks, but maybe hold
* dma_resv_lock() already.
@@ -747,12 +746,12 @@ EXPORT_SYMBOL_GPL(dma_resv_wait_timeout);
*
* True if all fences signaled, else false.
*/
-bool dma_resv_test_signaled(struct dma_resv *obj, bool test_all)
+bool dma_resv_test_signaled(struct dma_resv *obj, enum dma_resv_usage usage)
{
struct dma_resv_iter cursor;
struct dma_fence *fence;

- dma_resv_iter_begin(&cursor, obj, test_all);
+ dma_resv_iter_begin(&cursor, obj, usage);
dma_resv_for_each_fence_unlocked(&cursor, fence) {
dma_resv_iter_end(&cursor);
return false;
@@ -775,7 +774,7 @@ void dma_resv_describe(struct dma_resv *obj, struct seq_file *seq)
struct dma_resv_iter cursor;
struct dma_fence *fence;

- dma_resv_for_each_fence(&cursor, obj, true, 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");
diff --git a/drivers/dma-buf/st-dma-resv.c b/drivers/dma-buf/st-dma-resv.c
index d2e61f6ae989..d097981061b1 100644
--- a/drivers/dma-buf/st-dma-resv.c
+++ b/drivers/dma-buf/st-dma-resv.c
@@ -58,7 +58,7 @@ static int sanitycheck(void *arg)
return r;
}

-static int test_signaling(void *arg, bool shared)
+static int test_signaling(void *arg, enum dma_resv_usage usage)
{
struct dma_resv resv;
struct dma_fence *f;
@@ -81,18 +81,18 @@ static int test_signaling(void *arg, bool shared)
goto err_unlock;
}

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

- if (dma_resv_test_signaled(&resv, shared)) {
+ if (dma_resv_test_signaled(&resv, usage)) {
pr_err("Resv unexpectedly signaled\n");
r = -EINVAL;
goto err_unlock;
}
dma_fence_signal(f);
- if (!dma_resv_test_signaled(&resv, shared)) {
+ if (!dma_resv_test_signaled(&resv, usage)) {
pr_err("Resv not reporting signaled\n");
r = -EINVAL;
goto err_unlock;
@@ -107,15 +107,15 @@ static int test_signaling(void *arg, bool shared)

static int test_excl_signaling(void *arg)
{
- return test_signaling(arg, false);
+ return test_signaling(arg, DMA_RESV_USAGE_WRITE);
}

static int test_shared_signaling(void *arg)
{
- return test_signaling(arg, true);
+ return test_signaling(arg, DMA_RESV_USAGE_READ);
}

-static int test_for_each(void *arg, bool shared)
+static int test_for_each(void *arg, enum dma_resv_usage usage)
{
struct dma_resv_iter cursor;
struct dma_fence *f, *fence;
@@ -139,13 +139,13 @@ static int test_for_each(void *arg, bool shared)
goto err_unlock;
}

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

r = -ENOENT;
- dma_resv_for_each_fence(&cursor, &resv, shared, fence) {
+ dma_resv_for_each_fence(&cursor, &resv, usage, fence) {
if (!r) {
pr_err("More than one fence found\n");
r = -EINVAL;
@@ -156,7 +156,8 @@ static int test_for_each(void *arg, bool shared)
r = -EINVAL;
goto err_unlock;
}
- if (dma_resv_iter_is_exclusive(&cursor) != !shared) {
+ if (dma_resv_iter_is_exclusive(&cursor) !=
+ (usage >= DMA_RESV_USAGE_READ)) {
pr_err("Unexpected fence usage\n");
r = -EINVAL;
goto err_unlock;
@@ -178,15 +179,15 @@ static int test_for_each(void *arg, bool shared)

static int test_excl_for_each(void *arg)
{
- return test_for_each(arg, false);
+ return test_for_each(arg, DMA_RESV_USAGE_WRITE);
}

static int test_shared_for_each(void *arg)
{
- return test_for_each(arg, true);
+ return test_for_each(arg, DMA_RESV_USAGE_READ);
}

-static int test_for_each_unlocked(void *arg, bool shared)
+static int test_for_each_unlocked(void *arg, enum dma_resv_usage usage)
{
struct dma_resv_iter cursor;
struct dma_fence *f, *fence;
@@ -211,14 +212,14 @@ static int test_for_each_unlocked(void *arg, bool shared)
goto err_free;
}

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

r = -ENOENT;
- dma_resv_iter_begin(&cursor, &resv, shared);
+ dma_resv_iter_begin(&cursor, &resv, usage);
dma_resv_for_each_fence_unlocked(&cursor, fence) {
if (!r) {
pr_err("More than one fence found\n");
@@ -234,7 +235,8 @@ static int test_for_each_unlocked(void *arg, bool shared)
r = -EINVAL;
goto err_iter_end;
}
- if (dma_resv_iter_is_exclusive(&cursor) != !shared) {
+ if (dma_resv_iter_is_exclusive(&cursor) !=
+ (usage >= DMA_RESV_USAGE_READ)) {
pr_err("Unexpected fence usage\n");
r = -EINVAL;
goto err_iter_end;
@@ -262,15 +264,15 @@ static int test_for_each_unlocked(void *arg, bool shared)

static int test_excl_for_each_unlocked(void *arg)
{
- return test_for_each_unlocked(arg, false);
+ 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, true);
+ return test_for_each_unlocked(arg, DMA_RESV_USAGE_READ);
}

-static int test_get_fences(void *arg, bool shared)
+static int test_get_fences(void *arg, enum dma_resv_usage usage)
{
struct dma_fence *f, **fences = NULL;
struct dma_resv resv;
@@ -294,13 +296,13 @@ static int test_get_fences(void *arg, bool shared)
goto err_resv;
}

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

- r = dma_resv_get_fences(&resv, shared, &i, &fences);
+ r = dma_resv_get_fences(&resv, usage, &i, &fences);
if (r) {
pr_err("get_fences failed\n");
goto err_free;
@@ -324,12 +326,12 @@ static int test_get_fences(void *arg, bool shared)

static int test_excl_get_fences(void *arg)
{
- return test_get_fences(arg, false);
+ return test_get_fences(arg, DMA_RESV_USAGE_WRITE);
}

static int test_shared_get_fences(void *arg)
{
- return test_get_fences(arg, true);
+ return test_get_fences(arg, DMA_RESV_USAGE_READ);
}

int dma_resv(void)
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
index e85e347eb670..413f32c3fd63 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_cs.c
@@ -1288,7 +1288,9 @@ static int amdgpu_cs_submit(struct amdgpu_cs_parser *p,
*
* TODO: Remove together with dma_resv rework.
*/
- dma_resv_for_each_fence(&cursor, resv, false, fence) {
+ dma_resv_for_each_fence(&cursor, resv,
+ DMA_RESV_USAGE_WRITE,
+ fence) {
break;
}
dma_fence_chain_init(chain, fence, dma_fence_get(p->fence), 1);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
index fae5c1debfad..7a6908d71820 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_display.c
@@ -200,8 +200,7 @@ int amdgpu_display_crtc_page_flip_target(struct drm_crtc *crtc,
goto unpin;
}

- /* TODO: Unify this with other drivers */
- r = dma_resv_get_fences(new_abo->tbo.base.resv, true,
+ r = dma_resv_get_fences(new_abo->tbo.base.resv, DMA_RESV_USAGE_WRITE,
&work->shared_count,
&work->shared);
if (unlikely(r != 0)) {
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
index 57b74d35052f..84a53758e18e 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_gem.c
@@ -526,7 +526,8 @@ int amdgpu_gem_wait_idle_ioctl(struct drm_device *dev, void *data,
return -ENOENT;
}
robj = gem_to_amdgpu_bo(gobj);
- ret = dma_resv_wait_timeout(robj->tbo.base.resv, true, true, timeout);
+ ret = dma_resv_wait_timeout(robj->tbo.base.resv, DMA_RESV_USAGE_READ,
+ true, timeout);

/* ret == 0 means not signaled,
* ret > 0 means signaled
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c
index 81207737c716..65998cbcd7f7 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ids.c
@@ -111,7 +111,7 @@ void amdgpu_pasid_free_delayed(struct dma_resv *resv,
struct dma_fence *fence;
int r;

- r = dma_resv_get_singleton(resv, true, &fence);
+ r = dma_resv_get_singleton(resv, DMA_RESV_USAGE_READ, &fence);
if (r)
goto fallback;

@@ -139,7 +139,8 @@ void amdgpu_pasid_free_delayed(struct dma_resv *resv,
/* Not enough memory for the delayed delete, as last resort
* block for all the fences to complete.
*/
- dma_resv_wait_timeout(resv, true, false, MAX_SCHEDULE_TIMEOUT);
+ dma_resv_wait_timeout(resv, DMA_RESV_USAGE_READ,
+ false, MAX_SCHEDULE_TIMEOUT);
amdgpu_pasid_free(pasid);
}

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
index 4b153daf283d..86f5248676b0 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_mn.c
@@ -75,8 +75,8 @@ static bool amdgpu_mn_invalidate_gfx(struct mmu_interval_notifier *mni,

mmu_interval_set_seq(mni, cur_seq);

- r = dma_resv_wait_timeout(bo->tbo.base.resv, true, false,
- MAX_SCHEDULE_TIMEOUT);
+ r = dma_resv_wait_timeout(bo->tbo.base.resv, DMA_RESV_USAGE_READ,
+ false, MAX_SCHEDULE_TIMEOUT);
mutex_unlock(&adev->notifier_lock);
if (r <= 0)
DRM_ERROR("(%ld) failed to wait for user bo\n", r);
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
index 6f57a2fd5fe3..a7f39f8ab7be 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_object.c
@@ -768,8 +768,8 @@ int amdgpu_bo_kmap(struct amdgpu_bo *bo, void **ptr)
return 0;
}

- r = dma_resv_wait_timeout(bo->tbo.base.resv, false, false,
- MAX_SCHEDULE_TIMEOUT);
+ r = dma_resv_wait_timeout(bo->tbo.base.resv, DMA_RESV_USAGE_WRITE,
+ false, MAX_SCHEDULE_TIMEOUT);
if (r < 0)
return r;

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
index 40e06745fae9..744e144e5fc2 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_sync.c
@@ -259,7 +259,8 @@ int amdgpu_sync_resv(struct amdgpu_device *adev, struct amdgpu_sync *sync,
if (resv == NULL)
return -EINVAL;

- dma_resv_for_each_fence(&cursor, resv, true, f) {
+ /* TODO: Use DMA_RESV_USAGE_READ here */
+ dma_resv_for_each_fence(&cursor, resv, DMA_RESV_USAGE_READ, f) {
dma_fence_chain_for_each(f, f) {
struct dma_fence *tmp = dma_fence_chain_contained(f);

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
index f7f149588432..5db5066e74b4 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_ttm.c
@@ -1344,7 +1344,8 @@ static bool amdgpu_ttm_bo_eviction_valuable(struct ttm_buffer_object *bo,
* If true, then return false as any KFD process needs all its BOs to
* be resident to run successfully
*/
- dma_resv_for_each_fence(&resv_cursor, bo->base.resv, true, f) {
+ dma_resv_for_each_fence(&resv_cursor, bo->base.resv,
+ DMA_RESV_USAGE_READ, f) {
if (amdkfd_fence_check_mm(f, current->mm))
return false;
}
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c
index 39c74d9fa7cc..3654326219e0 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_uvd.c
@@ -1163,7 +1163,8 @@ static int amdgpu_uvd_send_msg(struct amdgpu_ring *ring, struct amdgpu_bo *bo,
ib->length_dw = 16;

if (direct) {
- r = dma_resv_wait_timeout(bo->tbo.base.resv, true, false,
+ r = dma_resv_wait_timeout(bo->tbo.base.resv,
+ DMA_RESV_USAGE_WRITE, false,
msecs_to_jiffies(10));
if (r == 0)
r = -ETIMEDOUT;
diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index b13451255e8b..a0376fd36a82 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -2059,7 +2059,7 @@ static void amdgpu_vm_prt_fini(struct amdgpu_device *adev, struct amdgpu_vm *vm)
struct dma_resv_iter cursor;
struct dma_fence *fence;

- dma_resv_for_each_fence(&cursor, resv, true, fence) {
+ dma_resv_for_each_fence(&cursor, resv, DMA_RESV_USAGE_READ, fence) {
/* Add a callback for each fence in the reservation object */
amdgpu_vm_prt_get(adev);
amdgpu_vm_add_prt_cb(adev, fence);
@@ -2665,7 +2665,7 @@ bool amdgpu_vm_evictable(struct amdgpu_bo *bo)
return true;

/* Don't evict VM page tables while they are busy */
- if (!dma_resv_test_signaled(bo->tbo.base.resv, true))
+ if (!dma_resv_test_signaled(bo->tbo.base.resv, DMA_RESV_USAGE_READ))
return false;

/* Try to block ongoing updates */
@@ -2845,7 +2845,8 @@ void amdgpu_vm_adjust_size(struct amdgpu_device *adev, uint32_t min_vm_size,
*/
long amdgpu_vm_wait_idle(struct amdgpu_vm *vm, long timeout)
{
- timeout = dma_resv_wait_timeout(vm->root.bo->tbo.base.resv, true,
+ timeout = dma_resv_wait_timeout(vm->root.bo->tbo.base.resv,
+ DMA_RESV_USAGE_READ,
true, timeout);
if (timeout <= 0)
return timeout;
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
index b30656959fd8..9e24b1e616af 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
@@ -9236,7 +9236,8 @@ static void amdgpu_dm_commit_planes(struct drm_atomic_state *state,
* deadlock during GPU reset when this fence will not signal
* but we hold reservation lock for the BO.
*/
- r = dma_resv_wait_timeout(abo->tbo.base.resv, true, false,
+ r = dma_resv_wait_timeout(abo->tbo.base.resv,
+ DMA_RESV_USAGE_WRITE, false,
msecs_to_jiffies(5000));
if (unlikely(r <= 0))
DRM_ERROR("Waiting for fences timed out!");
diff --git a/drivers/gpu/drm/drm_gem.c b/drivers/gpu/drm/drm_gem.c
index 133dfae06fab..eb0c2d041f13 100644
--- a/drivers/gpu/drm/drm_gem.c
+++ b/drivers/gpu/drm/drm_gem.c
@@ -771,7 +771,8 @@ long drm_gem_dma_resv_wait(struct drm_file *filep, u32 handle,
return -EINVAL;
}

- ret = dma_resv_wait_timeout(obj->resv, wait_all, true, timeout);
+ ret = dma_resv_wait_timeout(obj->resv, dma_resv_usage_rw(wait_all),
+ true, timeout);
if (ret == 0)
ret = -ETIME;
else if (ret > 0)
diff --git a/drivers/gpu/drm/drm_gem_atomic_helper.c b/drivers/gpu/drm/drm_gem_atomic_helper.c
index 9338ddb7edff..a6d89aed0bda 100644
--- a/drivers/gpu/drm/drm_gem_atomic_helper.c
+++ b/drivers/gpu/drm/drm_gem_atomic_helper.c
@@ -151,7 +151,7 @@ int drm_gem_plane_helper_prepare_fb(struct drm_plane *plane, struct drm_plane_st
return 0;

obj = drm_gem_fb_get_obj(state->fb, 0);
- ret = dma_resv_get_singleton(obj->resv, false, &fence);
+ ret = dma_resv_get_singleton(obj->resv, DMA_RESV_USAGE_WRITE, &fence);
if (ret)
return ret;

diff --git a/drivers/gpu/drm/etnaviv/etnaviv_gem.c b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
index d5314aa28ff7..507172e2780b 100644
--- a/drivers/gpu/drm/etnaviv/etnaviv_gem.c
+++ b/drivers/gpu/drm/etnaviv/etnaviv_gem.c
@@ -380,12 +380,14 @@ int etnaviv_gem_cpu_prep(struct drm_gem_object *obj, u32 op,
}

if (op & ETNA_PREP_NOSYNC) {
- if (!dma_resv_test_signaled(obj->resv, write))
+ if (!dma_resv_test_signaled(obj->resv,
+ dma_resv_usage_rw(write)))
return -EBUSY;
} else {
unsigned long remain = etnaviv_timeout_to_jiffies(timeout);

- ret = dma_resv_wait_timeout(obj->resv, write, true, remain);
+ ret = dma_resv_wait_timeout(obj->resv, dma_resv_usage_rw(write),
+ true, remain);
if (ret <= 0)
return ret == 0 ? -ETIMEDOUT : ret;
}
diff --git a/drivers/gpu/drm/i915/display/intel_atomic_plane.c b/drivers/gpu/drm/i915/display/intel_atomic_plane.c
index 5712688232fb..03e86e836a17 100644
--- a/drivers/gpu/drm/i915/display/intel_atomic_plane.c
+++ b/drivers/gpu/drm/i915/display/intel_atomic_plane.c
@@ -997,7 +997,8 @@ intel_prepare_plane_fb(struct drm_plane *_plane,
if (ret < 0)
goto unpin_fb;

- dma_resv_iter_begin(&cursor, obj->base.resv, false);
+ dma_resv_iter_begin(&cursor, obj->base.resv,
+ DMA_RESV_USAGE_WRITE);
dma_resv_for_each_fence_unlocked(&cursor, fence) {
add_rps_boost_after_vblank(new_plane_state->hw.crtc,
fence);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_busy.c b/drivers/gpu/drm/i915/gem/i915_gem_busy.c
index 470fdfd61a0f..14a1c0ad8c3c 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_busy.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_busy.c
@@ -138,12 +138,12 @@ i915_gem_busy_ioctl(struct drm_device *dev, void *data,
* Alternatively, we can trade that extra information on read/write
* activity with
* args->busy =
- * !dma_resv_test_signaled(obj->resv, true);
+ * !dma_resv_test_signaled(obj->resv, DMA_RESV_USAGE_READ);
* to report the overall busyness. This is what the wait-ioctl does.
*
*/
args->busy = 0;
- dma_resv_iter_begin(&cursor, obj->base.resv, true);
+ dma_resv_iter_begin(&cursor, obj->base.resv, DMA_RESV_USAGE_READ);
dma_resv_for_each_fence_unlocked(&cursor, fence) {
if (dma_resv_iter_is_restarted(&cursor))
args->busy = 0;
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_lmem.c b/drivers/gpu/drm/i915/gem/i915_gem_lmem.c
index 444f8268b9c5..a200d3e66573 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_lmem.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_lmem.c
@@ -66,7 +66,7 @@ bool __i915_gem_object_is_lmem(struct drm_i915_gem_object *obj)
struct intel_memory_region *mr = READ_ONCE(obj->mm.region);

#ifdef CONFIG_LOCKDEP
- GEM_WARN_ON(dma_resv_test_signaled(obj->base.resv, true) &&
+ GEM_WARN_ON(dma_resv_test_signaled(obj->base.resv, DMA_RESV_USAGE_READ) &&
i915_gem_object_evictable(obj));
#endif
return mr && (mr->type == INTEL_MEMORY_LOCAL ||
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
index 6d1a71d6404c..644fe237601c 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_userptr.c
@@ -86,7 +86,7 @@ static bool i915_gem_userptr_invalidate(struct mmu_interval_notifier *mni,
return true;

/* we will unbind on next submission, still have userptr pins */
- r = dma_resv_wait_timeout(obj->base.resv, true, false,
+ r = dma_resv_wait_timeout(obj->base.resv, DMA_RESV_USAGE_READ, false,
MAX_SCHEDULE_TIMEOUT);
if (r <= 0)
drm_err(&i915->drm, "(%ld) failed to wait for idle\n", r);
diff --git a/drivers/gpu/drm/i915/gem/i915_gem_wait.c b/drivers/gpu/drm/i915/gem/i915_gem_wait.c
index dab3d30c09a0..319936f91ac5 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_wait.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_wait.c
@@ -40,7 +40,8 @@ i915_gem_object_wait_reservation(struct dma_resv *resv,
struct dma_fence *fence;
long ret = timeout ?: 1;

- dma_resv_iter_begin(&cursor, resv, flags & I915_WAIT_ALL);
+ dma_resv_iter_begin(&cursor, resv,
+ dma_resv_usage_rw(flags & I915_WAIT_ALL));
dma_resv_for_each_fence_unlocked(&cursor, fence) {
ret = i915_gem_object_wait_fence(fence, flags, timeout);
if (ret <= 0)
@@ -117,7 +118,8 @@ i915_gem_object_wait_priority(struct drm_i915_gem_object *obj,
struct dma_resv_iter cursor;
struct dma_fence *fence;

- dma_resv_iter_begin(&cursor, obj->base.resv, flags & I915_WAIT_ALL);
+ dma_resv_iter_begin(&cursor, obj->base.resv,
+ dma_resv_usage_rw(flags & I915_WAIT_ALL));
dma_resv_for_each_fence_unlocked(&cursor, fence)
i915_gem_fence_wait_priority(fence, attr);
dma_resv_iter_end(&cursor);
diff --git a/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c
index b071a58dd6da..b4275b55e5b8 100644
--- a/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c
+++ b/drivers/gpu/drm/i915/gem/selftests/i915_gem_dmabuf.c
@@ -219,7 +219,8 @@ static int igt_dmabuf_import_same_driver(struct drm_i915_private *i915,
goto out_detach;
}

- timeout = dma_resv_wait_timeout(dmabuf->resv, false, true, 5 * HZ);
+ timeout = dma_resv_wait_timeout(dmabuf->resv, DMA_RESV_USAGE_WRITE,
+ true, 5 * HZ);
if (!timeout) {
pr_err("dmabuf wait for exclusive fence timed out.\n");
timeout = -ETIME;
diff --git a/drivers/gpu/drm/i915/i915_request.c b/drivers/gpu/drm/i915/i915_request.c
index 582770360ad1..73d5195146b0 100644
--- a/drivers/gpu/drm/i915/i915_request.c
+++ b/drivers/gpu/drm/i915/i915_request.c
@@ -1598,7 +1598,8 @@ i915_request_await_object(struct i915_request *to,
struct dma_fence *fence;
int ret = 0;

- dma_resv_for_each_fence(&cursor, obj->base.resv, write, fence) {
+ dma_resv_for_each_fence(&cursor, obj->base.resv,
+ dma_resv_usage_rw(write), fence) {
ret = i915_request_await_dma_fence(to, fence);
if (ret)
break;
diff --git a/drivers/gpu/drm/i915/i915_sw_fence.c b/drivers/gpu/drm/i915/i915_sw_fence.c
index 2a74a9a1cafe..ae984c66c48a 100644
--- a/drivers/gpu/drm/i915/i915_sw_fence.c
+++ b/drivers/gpu/drm/i915/i915_sw_fence.c
@@ -585,7 +585,7 @@ int i915_sw_fence_await_reservation(struct i915_sw_fence *fence,
debug_fence_assert(fence);
might_sleep_if(gfpflags_allow_blocking(gfp));

- dma_resv_iter_begin(&cursor, resv, write);
+ dma_resv_iter_begin(&cursor, resv, dma_resv_usage_rw(write));
dma_resv_for_each_fence_unlocked(&cursor, f) {
pending = i915_sw_fence_await_dma_fence(fence, f, timeout,
gfp);
diff --git a/drivers/gpu/drm/msm/msm_gem.c b/drivers/gpu/drm/msm/msm_gem.c
index 02b9ae65a96a..01bbb5f2d462 100644
--- a/drivers/gpu/drm/msm/msm_gem.c
+++ b/drivers/gpu/drm/msm/msm_gem.c
@@ -848,7 +848,8 @@ int msm_gem_cpu_prep(struct drm_gem_object *obj, uint32_t op, ktime_t *timeout)
op & MSM_PREP_NOSYNC ? 0 : timeout_to_jiffies(timeout);
long ret;

- ret = dma_resv_wait_timeout(obj->resv, write, true, remain);
+ ret = dma_resv_wait_timeout(obj->resv, dma_resv_usage_rw(write),
+ true, remain);
if (ret == 0)
return remain == 0 ? -EBUSY : -ETIMEDOUT;
else if (ret < 0)
diff --git a/drivers/gpu/drm/nouveau/dispnv50/wndw.c b/drivers/gpu/drm/nouveau/dispnv50/wndw.c
index e2faf92e4831..8642b84ea20c 100644
--- a/drivers/gpu/drm/nouveau/dispnv50/wndw.c
+++ b/drivers/gpu/drm/nouveau/dispnv50/wndw.c
@@ -558,7 +558,8 @@ nv50_wndw_prepare_fb(struct drm_plane *plane, struct drm_plane_state *state)
asyw->image.handle[0] = ctxdma->object.handle;
}

- ret = dma_resv_get_singleton(nvbo->bo.base.resv, false,
+ ret = dma_resv_get_singleton(nvbo->bo.base.resv,
+ DMA_RESV_USAGE_WRITE,
&asyw->state.fence);
if (ret)
return ret;
diff --git a/drivers/gpu/drm/nouveau/nouveau_bo.c b/drivers/gpu/drm/nouveau/nouveau_bo.c
index 74f8652d2bd3..c6bb4dbcd735 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bo.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bo.c
@@ -962,11 +962,11 @@ nouveau_bo_vm_cleanup(struct ttm_buffer_object *bo,
struct dma_fence *fence;
int ret;

- /* TODO: This is actually a memory management dependency */
- ret = dma_resv_get_singleton(bo->base.resv, false, &fence);
+ ret = dma_resv_get_singleton(bo->base.resv, DMA_RESV_USAGE_WRITE,
+ &fence);
if (ret)
- dma_resv_wait_timeout(bo->base.resv, false, false,
- MAX_SCHEDULE_TIMEOUT);
+ dma_resv_wait_timeout(bo->base.resv, DMA_RESV_USAGE_WRITE,
+ false, MAX_SCHEDULE_TIMEOUT);

nv10_bo_put_tile_region(dev, *old_tile, fence);
*old_tile = new_tile;
diff --git a/drivers/gpu/drm/nouveau/nouveau_fence.c b/drivers/gpu/drm/nouveau/nouveau_fence.c
index 0268259e97eb..d5e81ccee01c 100644
--- a/drivers/gpu/drm/nouveau/nouveau_fence.c
+++ b/drivers/gpu/drm/nouveau/nouveau_fence.c
@@ -350,14 +350,16 @@ nouveau_fence_sync(struct nouveau_bo *nvbo, struct nouveau_channel *chan,
if (ret)
return ret;

- /* Waiting for the exclusive fence first causes performance regressions
- * under some circumstances. So manually wait for the shared ones first.
+ /* Waiting for the writes first causes performance regressions
+ * under some circumstances. So manually wait for the reads first.
*/
for (i = 0; i < 2; ++i) {
struct dma_resv_iter cursor;
struct dma_fence *fence;

- dma_resv_for_each_fence(&cursor, resv, exclusive, fence) {
+ dma_resv_for_each_fence(&cursor, resv,
+ dma_resv_usage_rw(exclusive),
+ fence) {
struct nouveau_fence *f;

if (i == 0 && dma_resv_iter_is_exclusive(&cursor))
diff --git a/drivers/gpu/drm/nouveau/nouveau_gem.c b/drivers/gpu/drm/nouveau/nouveau_gem.c
index 9416bee92141..fab542a758ff 100644
--- a/drivers/gpu/drm/nouveau/nouveau_gem.c
+++ b/drivers/gpu/drm/nouveau/nouveau_gem.c
@@ -962,7 +962,8 @@ nouveau_gem_ioctl_cpu_prep(struct drm_device *dev, void *data,
return -ENOENT;
nvbo = nouveau_gem_object(gem);

- lret = dma_resv_wait_timeout(nvbo->bo.base.resv, write, true,
+ lret = dma_resv_wait_timeout(nvbo->bo.base.resv,
+ dma_resv_usage_rw(write), true,
no_wait ? 0 : 30 * HZ);
if (!lret)
ret = -EBUSY;
diff --git a/drivers/gpu/drm/panfrost/panfrost_drv.c b/drivers/gpu/drm/panfrost/panfrost_drv.c
index 94b6f0a19c83..7fcbc2a5b6cd 100644
--- a/drivers/gpu/drm/panfrost/panfrost_drv.c
+++ b/drivers/gpu/drm/panfrost/panfrost_drv.c
@@ -316,7 +316,8 @@ panfrost_ioctl_wait_bo(struct drm_device *dev, void *data,
if (!gem_obj)
return -ENOENT;

- ret = dma_resv_wait_timeout(gem_obj->resv, true, true, timeout);
+ ret = dma_resv_wait_timeout(gem_obj->resv, DMA_RESV_USAGE_READ,
+ true, timeout);
if (!ret)
ret = timeout ? -ETIMEDOUT : -EBUSY;

diff --git a/drivers/gpu/drm/qxl/qxl_debugfs.c b/drivers/gpu/drm/qxl/qxl_debugfs.c
index 6a36b0fd845c..33e5889d6608 100644
--- a/drivers/gpu/drm/qxl/qxl_debugfs.c
+++ b/drivers/gpu/drm/qxl/qxl_debugfs.c
@@ -61,7 +61,8 @@ qxl_debugfs_buffers_info(struct seq_file *m, void *data)
struct dma_fence *fence;
int rel = 0;

- dma_resv_iter_begin(&cursor, bo->tbo.base.resv, true);
+ dma_resv_iter_begin(&cursor, bo->tbo.base.resv,
+ DMA_RESV_USAGE_READ);
dma_resv_for_each_fence_unlocked(&cursor, fence) {
if (dma_resv_iter_is_restarted(&cursor))
rel = 0;
diff --git a/drivers/gpu/drm/radeon/radeon_display.c b/drivers/gpu/drm/radeon/radeon_display.c
index f60e826cd292..57ff2b723c87 100644
--- a/drivers/gpu/drm/radeon/radeon_display.c
+++ b/drivers/gpu/drm/radeon/radeon_display.c
@@ -533,7 +533,8 @@ static int radeon_crtc_page_flip_target(struct drm_crtc *crtc,
DRM_ERROR("failed to pin new rbo buffer before flip\n");
goto cleanup;
}
- r = dma_resv_get_singleton(new_rbo->tbo.base.resv, false, &work->fence);
+ r = dma_resv_get_singleton(new_rbo->tbo.base.resv, DMA_RESV_USAGE_WRITE,
+ &work->fence);
if (r) {
radeon_bo_unreserve(new_rbo);
DRM_ERROR("failed to get new rbo buffer fences\n");
diff --git a/drivers/gpu/drm/radeon/radeon_gem.c b/drivers/gpu/drm/radeon/radeon_gem.c
index f563284a7fac..6616a828f40b 100644
--- a/drivers/gpu/drm/radeon/radeon_gem.c
+++ b/drivers/gpu/drm/radeon/radeon_gem.c
@@ -162,7 +162,9 @@ static int radeon_gem_set_domain(struct drm_gem_object *gobj,
}
if (domain == RADEON_GEM_DOMAIN_CPU) {
/* Asking for cpu access wait for object idle */
- r = dma_resv_wait_timeout(robj->tbo.base.resv, true, true, 30 * HZ);
+ r = dma_resv_wait_timeout(robj->tbo.base.resv,
+ DMA_RESV_USAGE_READ,
+ true, 30 * HZ);
if (!r)
r = -EBUSY;

@@ -524,7 +526,7 @@ int radeon_gem_busy_ioctl(struct drm_device *dev, void *data,
}
robj = gem_to_radeon_bo(gobj);

- r = dma_resv_test_signaled(robj->tbo.base.resv, true);
+ r = dma_resv_test_signaled(robj->tbo.base.resv, DMA_RESV_USAGE_READ);
if (r == 0)
r = -EBUSY;
else
@@ -553,7 +555,8 @@ int radeon_gem_wait_idle_ioctl(struct drm_device *dev, void *data,
}
robj = gem_to_radeon_bo(gobj);

- ret = dma_resv_wait_timeout(robj->tbo.base.resv, true, true, 30 * HZ);
+ ret = dma_resv_wait_timeout(robj->tbo.base.resv, DMA_RESV_USAGE_READ,
+ true, 30 * HZ);
if (ret == 0)
r = -EBUSY;
else if (ret < 0)
diff --git a/drivers/gpu/drm/radeon/radeon_mn.c b/drivers/gpu/drm/radeon/radeon_mn.c
index 9fa88549c89e..68ebeb1bdfff 100644
--- a/drivers/gpu/drm/radeon/radeon_mn.c
+++ b/drivers/gpu/drm/radeon/radeon_mn.c
@@ -66,8 +66,8 @@ static bool radeon_mn_invalidate(struct mmu_interval_notifier *mn,
return true;
}

- r = dma_resv_wait_timeout(bo->tbo.base.resv, true, false,
- MAX_SCHEDULE_TIMEOUT);
+ r = dma_resv_wait_timeout(bo->tbo.base.resv, DMA_RESV_USAGE_READ,
+ false, MAX_SCHEDULE_TIMEOUT);
if (r <= 0)
DRM_ERROR("(%ld) failed to wait for user bo\n", r);

diff --git a/drivers/gpu/drm/radeon/radeon_sync.c b/drivers/gpu/drm/radeon/radeon_sync.c
index b991ba1bcd51..49bbb2266c0f 100644
--- a/drivers/gpu/drm/radeon/radeon_sync.c
+++ b/drivers/gpu/drm/radeon/radeon_sync.c
@@ -96,7 +96,7 @@ int radeon_sync_resv(struct radeon_device *rdev,
struct dma_fence *f;
int r = 0;

- dma_resv_for_each_fence(&cursor, resv, shared, f) {
+ dma_resv_for_each_fence(&cursor, resv, dma_resv_usage_rw(shared), f) {
fence = to_radeon_fence(f);
if (fence && fence->rdev == rdev)
radeon_sync_fence(sync, fence);
diff --git a/drivers/gpu/drm/radeon/radeon_uvd.c b/drivers/gpu/drm/radeon/radeon_uvd.c
index bc0f44299bb9..a50750740ab0 100644
--- a/drivers/gpu/drm/radeon/radeon_uvd.c
+++ b/drivers/gpu/drm/radeon/radeon_uvd.c
@@ -478,8 +478,8 @@ static int radeon_uvd_cs_msg(struct radeon_cs_parser *p, struct radeon_bo *bo,
return -EINVAL;
}

- r = dma_resv_wait_timeout(bo->tbo.base.resv, false, false,
- MAX_SCHEDULE_TIMEOUT);
+ r = dma_resv_wait_timeout(bo->tbo.base.resv, DMA_RESV_USAGE_WRITE,
+ false, MAX_SCHEDULE_TIMEOUT);
if (r <= 0) {
DRM_ERROR("Failed waiting for UVD message (%ld)!\n", r);
return r ? r : -ETIME;
diff --git a/drivers/gpu/drm/scheduler/sched_main.c b/drivers/gpu/drm/scheduler/sched_main.c
index c5660b066554..76fd2904c7c6 100644
--- a/drivers/gpu/drm/scheduler/sched_main.c
+++ b/drivers/gpu/drm/scheduler/sched_main.c
@@ -705,7 +705,8 @@ int drm_sched_job_add_implicit_dependencies(struct drm_sched_job *job,

dma_resv_assert_held(obj->resv);

- dma_resv_for_each_fence(&cursor, obj->resv, write, fence) {
+ dma_resv_for_each_fence(&cursor, obj->resv, dma_resv_usage_rw(write),
+ fence) {
/* Make sure to grab an additional ref on the added fence */
dma_fence_get(fence);
ret = drm_sched_job_add_dependency(job, fence);
diff --git a/drivers/gpu/drm/ttm/ttm_bo.c b/drivers/gpu/drm/ttm/ttm_bo.c
index c49996cf25d0..cff05b62f3f7 100644
--- a/drivers/gpu/drm/ttm/ttm_bo.c
+++ b/drivers/gpu/drm/ttm/ttm_bo.c
@@ -223,7 +223,7 @@ static void ttm_bo_flush_all_fences(struct ttm_buffer_object *bo)
struct dma_resv_iter cursor;
struct dma_fence *fence;

- dma_resv_iter_begin(&cursor, resv, true);
+ dma_resv_iter_begin(&cursor, resv, DMA_RESV_USAGE_READ);
dma_resv_for_each_fence_unlocked(&cursor, fence) {
if (!fence->ops->signaled)
dma_fence_enable_sw_signaling(fence);
@@ -252,7 +252,7 @@ static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
struct dma_resv *resv = &bo->base._resv;
int ret;

- if (dma_resv_test_signaled(resv, true))
+ if (dma_resv_test_signaled(resv, DMA_RESV_USAGE_READ))
ret = 0;
else
ret = -EBUSY;
@@ -264,7 +264,8 @@ static int ttm_bo_cleanup_refs(struct ttm_buffer_object *bo,
dma_resv_unlock(bo->base.resv);
spin_unlock(&bo->bdev->lru_lock);

- lret = dma_resv_wait_timeout(resv, true, interruptible,
+ lret = dma_resv_wait_timeout(resv, DMA_RESV_USAGE_READ,
+ interruptible,
30 * HZ);

if (lret < 0)
@@ -367,7 +368,8 @@ static void ttm_bo_release(struct kref *kref)
/* Last resort, if we fail to allocate memory for the
* fences block for the BO to become idle
*/
- dma_resv_wait_timeout(bo->base.resv, true, false,
+ dma_resv_wait_timeout(bo->base.resv,
+ DMA_RESV_USAGE_READ, false,
30 * HZ);
}

@@ -378,7 +380,7 @@ static void ttm_bo_release(struct kref *kref)
ttm_mem_io_free(bdev, bo->resource);
}

- if (!dma_resv_test_signaled(bo->base.resv, true) ||
+ if (!dma_resv_test_signaled(bo->base.resv, DMA_RESV_USAGE_READ) ||
!dma_resv_trylock(bo->base.resv)) {
/* The BO is not idle, resurrect it for delayed destroy */
ttm_bo_flush_all_fences(bo);
@@ -1044,14 +1046,14 @@ int ttm_bo_wait(struct ttm_buffer_object *bo,
long timeout = 15 * HZ;

if (no_wait) {
- if (dma_resv_test_signaled(bo->base.resv, true))
+ if (dma_resv_test_signaled(bo->base.resv, DMA_RESV_USAGE_READ))
return 0;
else
return -EBUSY;
}

- timeout = dma_resv_wait_timeout(bo->base.resv, true, interruptible,
- timeout);
+ timeout = dma_resv_wait_timeout(bo->base.resv, DMA_RESV_USAGE_READ,
+ interruptible, timeout);
if (timeout < 0)
return timeout;

diff --git a/drivers/gpu/drm/vgem/vgem_fence.c b/drivers/gpu/drm/vgem/vgem_fence.c
index 2ddbebca87d9..91fc4940c65a 100644
--- a/drivers/gpu/drm/vgem/vgem_fence.c
+++ b/drivers/gpu/drm/vgem/vgem_fence.c
@@ -130,6 +130,7 @@ int vgem_fence_attach_ioctl(struct drm_device *dev,
struct vgem_file *vfile = file->driver_priv;
struct dma_resv *resv;
struct drm_gem_object *obj;
+ enum dma_resv_usage usage;
struct dma_fence *fence;
int ret;

@@ -151,7 +152,8 @@ int vgem_fence_attach_ioctl(struct drm_device *dev,

/* Check for a conflicting fence */
resv = obj->resv;
- if (!dma_resv_test_signaled(resv, arg->flags & VGEM_FENCE_WRITE)) {
+ usage = dma_resv_usage_rw(arg->flags & VGEM_FENCE_WRITE);
+ if (!dma_resv_test_signaled(resv, usage)) {
ret = -EBUSY;
goto err_fence;
}
diff --git a/drivers/gpu/drm/virtio/virtgpu_ioctl.c b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
index 77743fd2c61a..f8d83358d2a0 100644
--- a/drivers/gpu/drm/virtio/virtgpu_ioctl.c
+++ b/drivers/gpu/drm/virtio/virtgpu_ioctl.c
@@ -518,9 +518,10 @@ static int virtio_gpu_wait_ioctl(struct drm_device *dev, void *data,
return -ENOENT;

if (args->flags & VIRTGPU_WAIT_NOWAIT) {
- ret = dma_resv_test_signaled(obj->resv, true);
+ ret = dma_resv_test_signaled(obj->resv, DMA_RESV_USAGE_READ);
} else {
- ret = dma_resv_wait_timeout(obj->resv, true, true, timeout);
+ ret = dma_resv_wait_timeout(obj->resv, DMA_RESV_USAGE_READ,
+ true, timeout);
}
if (ret == 0)
ret = -EBUSY;
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
index fe13aa8b4a64..b96884f7d03d 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_bo.c
@@ -528,8 +528,8 @@ static int vmw_user_bo_synccpu_grab(struct vmw_buffer_object *vmw_bo,
if (flags & drm_vmw_synccpu_allow_cs) {
long lret;

- lret = dma_resv_wait_timeout(bo->base.resv, true, true,
- nonblock ? 0 :
+ lret = dma_resv_wait_timeout(bo->base.resv, DMA_RESV_USAGE_READ,
+ true, nonblock ? 0 :
MAX_SCHEDULE_TIMEOUT);
if (!lret)
return -EBUSY;
diff --git a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
index 626067104751..a84d1d5628d0 100644
--- a/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
+++ b/drivers/gpu/drm/vmwgfx/vmwgfx_resource.c
@@ -1164,7 +1164,8 @@ int vmw_resources_clean(struct vmw_buffer_object *vbo, pgoff_t start,
if (bo->moving)
dma_fence_put(bo->moving);

- return dma_resv_get_singleton(bo->base.resv, false,
+ return dma_resv_get_singleton(bo->base.resv,
+ DMA_RESV_USAGE_WRITE,
&bo->moving);
}

diff --git a/drivers/infiniband/core/umem_dmabuf.c b/drivers/infiniband/core/umem_dmabuf.c
index d32cd7538835..f9901d273b8e 100644
--- a/drivers/infiniband/core/umem_dmabuf.c
+++ b/drivers/infiniband/core/umem_dmabuf.c
@@ -67,7 +67,8 @@ int ib_umem_dmabuf_map_pages(struct ib_umem_dmabuf *umem_dmabuf)
* may be not up-to-date. Wait for the exporter to finish
* the migration.
*/
- return dma_resv_wait_timeout(umem_dmabuf->attach->dmabuf->resv, false,
+ return dma_resv_wait_timeout(umem_dmabuf->attach->dmabuf->resv,
+ DMA_RESV_USAGE_WRITE,
false, MAX_SCHEDULE_TIMEOUT);
}
EXPORT_SYMBOL(ib_umem_dmabuf_map_pages);
diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
index 6fb91956ab8d..a297397743a2 100644
--- a/include/linux/dma-buf.h
+++ b/include/linux/dma-buf.h
@@ -408,6 +408,9 @@ struct dma_buf {
* pipelining across drivers. These do not set any fences for their
* access. An example here is v4l.
*
+ * - Driver should use dma_resv_usage_rw() when retrieving fences as
+ * dependency for implicit synchronization.
+ *
* DYNAMIC IMPORTER RULES:
*
* Dynamic importers, see dma_buf_attachment_is_dynamic(), have
@@ -423,8 +426,9 @@ struct dma_buf {
*
* IMPORTANT:
*
- * All drivers must obey the struct dma_resv rules, specifically the
- * rules for updating and obeying fences.
+ * All drivers and memory management related functions must obey the
+ * struct dma_resv rules, specifically the rules for updating and
+ * obeying fences. See enum dma_resv_usage for further descriptions.
*/
struct dma_resv *resv;

diff --git a/include/linux/dma-resv.h b/include/linux/dma-resv.h
index 5fa04d0fccad..92cd8023980f 100644
--- a/include/linux/dma-resv.h
+++ b/include/linux/dma-resv.h
@@ -49,6 +49,53 @@ extern struct ww_class reservation_ww_class;

struct dma_resv_list;

+/**
+ * enum dma_resv_usage - how the fences from a dma_resv obj are used
+ *
+ * This enum describes the different use cases for a dma_resv object and
+ * controls which fences are returned when queried.
+ *
+ * An important fact is that there is the order WRITE<READ and when the
+ * dma_resv object is asked for fences for one use case the fences for the
+ * lower use case are returned as well.
+ */
+enum dma_resv_usage {
+ /**
+ * @DMA_RESV_USAGE_WRITE: Implicit write synchronization.
+ *
+ * This should only be used for userspace command submissions which add
+ * an implicit write dependency.
+ */
+ DMA_RESV_USAGE_WRITE,
+
+ /**
+ * @DMA_RESV_USAGE_READ: Implicit read synchronization.
+ *
+ * This should only be used for userspace command submissions which add
+ * an implicit read dependency.
+ */
+ DMA_RESV_USAGE_READ,
+};
+
+/**
+ * dma_resv_usage_rw - helper for implicit sync
+ * @write: true if we create a new implicit sync write
+ *
+ * This returns the implicit synchronization usage for write or read accesses,
+ * see enum dma_resv_usage and &dma_buf.resv.
+ */
+static inline enum dma_resv_usage dma_resv_usage_rw(bool write)
+{
+ /* This looks confusing at first sight, but is indeed correct.
+ *
+ * The rational is that new write operations needs to wait for the
+ * existing read and write operations to finish.
+ * But a new read operation only needs to wait for the existing write
+ * operations to finish.
+ */
+ return write ? DMA_RESV_USAGE_READ : DMA_RESV_USAGE_WRITE;
+}
+
/**
* struct dma_resv - a reservation object manages fences for a buffer
*
@@ -142,8 +189,8 @@ struct dma_resv_iter {
/** @obj: The dma_resv object we iterate over */
struct dma_resv *obj;

- /** @all_fences: If all fences should be returned */
- bool all_fences;
+ /** @usage: Return fences with this usage or lower. */
+ enum dma_resv_usage usage;

/** @fence: the currently handled fence */
struct dma_fence *fence;
@@ -173,14 +220,14 @@ struct dma_fence *dma_resv_iter_next(struct dma_resv_iter *cursor);
* dma_resv_iter_begin - initialize a dma_resv_iter object
* @cursor: The dma_resv_iter object to initialize
* @obj: The dma_resv object which we want to iterate over
- * @all_fences: If all fences should be returned or just the exclusive one
+ * @usage: controls which fences to include, see enum dma_resv_usage.
*/
static inline void dma_resv_iter_begin(struct dma_resv_iter *cursor,
struct dma_resv *obj,
- bool all_fences)
+ enum dma_resv_usage usage)
{
cursor->obj = obj;
- cursor->all_fences = all_fences;
+ cursor->usage = usage;
cursor->fence = NULL;
}

@@ -241,7 +288,7 @@ static inline bool dma_resv_iter_is_restarted(struct dma_resv_iter *cursor)
* dma_resv_for_each_fence - fence iterator
* @cursor: a struct dma_resv_iter pointer
* @obj: a dma_resv object pointer
- * @all_fences: true if all fences should be returned
+ * @usage: controls which fences to return
* @fence: the current fence
*
* Iterate over the fences in a struct dma_resv object while holding the
@@ -250,8 +297,8 @@ static inline bool dma_resv_iter_is_restarted(struct dma_resv_iter *cursor)
* valid as long as the lock is held and so no extra reference to the fence is
* taken.
*/
-#define dma_resv_for_each_fence(cursor, obj, all_fences, fence) \
- for (dma_resv_iter_begin(cursor, obj, all_fences), \
+#define dma_resv_for_each_fence(cursor, obj, usage, fence) \
+ for (dma_resv_iter_begin(cursor, obj, usage), \
fence = dma_resv_iter_first(cursor); fence; \
fence = dma_resv_iter_next(cursor))

@@ -418,14 +465,14 @@ void dma_resv_add_shared_fence(struct dma_resv *obj, struct dma_fence *fence);
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);
-int dma_resv_get_fences(struct dma_resv *obj, bool write,
+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, bool write,
+int dma_resv_get_singleton(struct dma_resv *obj, enum dma_resv_usage usage,
struct dma_fence **fence);
int dma_resv_copy_fences(struct dma_resv *dst, struct dma_resv *src);
-long dma_resv_wait_timeout(struct dma_resv *obj, bool wait_all, bool intr,
- unsigned long timeout);
-bool dma_resv_test_signaled(struct dma_resv *obj, bool test_all);
+long dma_resv_wait_timeout(struct dma_resv *obj, enum dma_resv_usage usage,
+ bool intr, unsigned long timeout);
+bool dma_resv_test_signaled(struct dma_resv *obj, enum dma_resv_usage usage);
void dma_resv_describe(struct dma_resv *obj, struct seq_file *seq);

#endif /* _LINUX_RESERVATION_H */
--
2.25.1