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-rw-r--r--Documentation/dma-buf-sharing.txt11
-rw-r--r--drivers/dma-buf/dma-buf.c19
-rw-r--r--drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c2
-rw-r--r--drivers/gpu/drm/drm_atomic.c1
-rw-r--r--drivers/gpu/drm/drm_atomic_helper.c14
-rw-r--r--drivers/gpu/drm/i915/i915_gem_dmabuf.c15
-rw-r--r--drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c5
-rw-r--r--drivers/gpu/drm/udl/udl_fb.c4
-rw-r--r--drivers/staging/android/ion/ion.c6
-rw-r--r--include/linux/dma-buf.h6
-rw-r--r--include/linux/fence.h2
11 files changed, 45 insertions, 40 deletions
diff --git a/Documentation/dma-buf-sharing.txt b/Documentation/dma-buf-sharing.txt
index 32ac32e773e1..ca44c5820585 100644
--- a/Documentation/dma-buf-sharing.txt
+++ b/Documentation/dma-buf-sharing.txt
@@ -352,7 +352,8 @@ Being able to mmap an export dma-buf buffer object has 2 main use-cases:
No special interfaces, userspace simply calls mmap on the dma-buf fd, making
sure that the cache synchronization ioctl (DMA_BUF_IOCTL_SYNC) is *always*
- used when the access happens. This is discussed next paragraphs.
+ used when the access happens. Note that DMA_BUF_IOCTL_SYNC can fail with
+ -EAGAIN or -EINTR, in which case it must be restarted.
Some systems might need some sort of cache coherency management e.g. when
CPU and GPU domains are being accessed through dma-buf at the same time. To
@@ -366,10 +367,10 @@ Being able to mmap an export dma-buf buffer object has 2 main use-cases:
want (with the new data being consumed by the GPU or say scanout device)
- munmap once you don't need the buffer any more
- Therefore, for correctness and optimal performance, systems with the memory
- cache shared by the GPU and CPU i.e. the "coherent" and also the
- "incoherent" are always required to use SYNC_START and SYNC_END before and
- after, respectively, when accessing the mapped address.
+ For correctness and optimal performance, it is always required to use
+ SYNC_START and SYNC_END before and after, respectively, when accessing the
+ mapped address. Userspace cannot rely on coherent access, even when there
+ are systems where it just works without calling these ioctls.
2. Supporting existing mmap interfaces in importers
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 9810d1df0691..4a2c07ee6677 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -259,6 +259,7 @@ static long dma_buf_ioctl(struct file *file,
struct dma_buf *dmabuf;
struct dma_buf_sync sync;
enum dma_data_direction direction;
+ int ret;
dmabuf = file->private_data;
@@ -285,11 +286,11 @@ static long dma_buf_ioctl(struct file *file,
}
if (sync.flags & DMA_BUF_SYNC_END)
- dma_buf_end_cpu_access(dmabuf, direction);
+ ret = dma_buf_end_cpu_access(dmabuf, direction);
else
- dma_buf_begin_cpu_access(dmabuf, direction);
+ ret = dma_buf_begin_cpu_access(dmabuf, direction);
- return 0;
+ return ret;
default:
return -ENOTTY;
}
@@ -611,15 +612,19 @@ EXPORT_SYMBOL_GPL(dma_buf_begin_cpu_access);
* @dmabuf: [in] buffer to complete cpu access for.
* @direction: [in] length of range for cpu access.
*
- * This call must always succeed.
+ * Can return negative error values, returns 0 on success.
*/
-void dma_buf_end_cpu_access(struct dma_buf *dmabuf,
- enum dma_data_direction direction)
+int dma_buf_end_cpu_access(struct dma_buf *dmabuf,
+ enum dma_data_direction direction)
{
+ int ret = 0;
+
WARN_ON(!dmabuf);
if (dmabuf->ops->end_cpu_access)
- dmabuf->ops->end_cpu_access(dmabuf, direction);
+ ret = dmabuf->ops->end_cpu_access(dmabuf, direction);
+
+ return ret;
}
EXPORT_SYMBOL_GPL(dma_buf_end_cpu_access);
diff --git a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
index 1ffe9c329c46..d65dcaee3832 100644
--- a/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
+++ b/drivers/gpu/drm/atmel-hlcdc/atmel_hlcdc_plane.c
@@ -558,7 +558,7 @@ static int atmel_hlcdc_plane_atomic_check(struct drm_plane *p,
if (!state->base.crtc || !fb)
return 0;
- crtc_state = s->state->crtc_states[drm_crtc_index(s->crtc)];
+ crtc_state = drm_atomic_get_existing_crtc_state(s->state, s->crtc);
mode = &crtc_state->adjusted_mode;
state->src_x = s->src_x;
diff --git a/drivers/gpu/drm/drm_atomic.c b/drivers/gpu/drm/drm_atomic.c
index a2596eb803fc..8ee1db866e80 100644
--- a/drivers/gpu/drm/drm_atomic.c
+++ b/drivers/gpu/drm/drm_atomic.c
@@ -380,7 +380,6 @@ EXPORT_SYMBOL(drm_atomic_set_mode_prop_for_crtc);
* drm_atomic_replace_property_blob - replace a blob property
* @blob: a pointer to the member blob to be replaced
* @new_blob: the new blob to replace with
- * @expected_size: the expected size of the new blob
* @replaced: whether the blob has been replaced
*
* RETURNS:
diff --git a/drivers/gpu/drm/drm_atomic_helper.c b/drivers/gpu/drm/drm_atomic_helper.c
index 2bb90faa0ee2..4befe25c81c7 100644
--- a/drivers/gpu/drm/drm_atomic_helper.c
+++ b/drivers/gpu/drm/drm_atomic_helper.c
@@ -67,7 +67,8 @@ drm_atomic_helper_plane_changed(struct drm_atomic_state *state,
struct drm_crtc_state *crtc_state;
if (plane->state->crtc) {
- crtc_state = state->crtc_states[drm_crtc_index(plane->state->crtc)];
+ crtc_state = drm_atomic_get_existing_crtc_state(state,
+ plane->state->crtc);
if (WARN_ON(!crtc_state))
return;
@@ -76,8 +77,8 @@ drm_atomic_helper_plane_changed(struct drm_atomic_state *state,
}
if (plane_state->crtc) {
- crtc_state =
- state->crtc_states[drm_crtc_index(plane_state->crtc)];
+ crtc_state = drm_atomic_get_existing_crtc_state(state,
+ plane_state->crtc);
if (WARN_ON(!crtc_state))
return;
@@ -374,8 +375,8 @@ mode_fixup(struct drm_atomic_state *state)
if (!conn_state->crtc || !conn_state->best_encoder)
continue;
- crtc_state =
- state->crtc_states[drm_crtc_index(conn_state->crtc)];
+ crtc_state = drm_atomic_get_existing_crtc_state(state,
+ conn_state->crtc);
/*
* Each encoder has at most one connector (since we always steal
@@ -679,7 +680,8 @@ disable_outputs(struct drm_device *dev, struct drm_atomic_state *old_state)
if (!old_conn_state->crtc)
continue;
- old_crtc_state = old_state->crtc_states[drm_crtc_index(old_conn_state->crtc)];
+ old_crtc_state = drm_atomic_get_existing_crtc_state(old_state,
+ old_conn_state->crtc);
if (!old_crtc_state->active ||
!drm_atomic_crtc_needs_modeset(old_conn_state->crtc->state))
diff --git a/drivers/gpu/drm/i915/i915_gem_dmabuf.c b/drivers/gpu/drm/i915/i915_gem_dmabuf.c
index 1f3eef6fb345..0506016e18e0 100644
--- a/drivers/gpu/drm/i915/i915_gem_dmabuf.c
+++ b/drivers/gpu/drm/i915/i915_gem_dmabuf.c
@@ -228,25 +228,20 @@ static int i915_gem_begin_cpu_access(struct dma_buf *dma_buf, enum dma_data_dire
return ret;
}
-static void i915_gem_end_cpu_access(struct dma_buf *dma_buf, enum dma_data_direction direction)
+static int i915_gem_end_cpu_access(struct dma_buf *dma_buf, enum dma_data_direction direction)
{
struct drm_i915_gem_object *obj = dma_buf_to_obj(dma_buf);
struct drm_device *dev = obj->base.dev;
- struct drm_i915_private *dev_priv = to_i915(dev);
- bool was_interruptible;
int ret;
- mutex_lock(&dev->struct_mutex);
- was_interruptible = dev_priv->mm.interruptible;
- dev_priv->mm.interruptible = false;
+ ret = i915_mutex_lock_interruptible(dev);
+ if (ret)
+ return ret;
ret = i915_gem_object_set_to_gtt_domain(obj, false);
-
- dev_priv->mm.interruptible = was_interruptible;
mutex_unlock(&dev->struct_mutex);
- if (unlikely(ret))
- DRM_ERROR("unable to flush buffer following CPU access; rendering may be corrupt\n");
+ return ret;
}
static const struct dma_buf_ops i915_dmabuf_ops = {
diff --git a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
index 3cf8aab23a39..af267c35d813 100644
--- a/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
+++ b/drivers/gpu/drm/omapdrm/omap_gem_dmabuf.c
@@ -97,11 +97,12 @@ static int omap_gem_dmabuf_begin_cpu_access(struct dma_buf *buffer,
return omap_gem_get_pages(obj, &pages, true);
}
-static void omap_gem_dmabuf_end_cpu_access(struct dma_buf *buffer,
- enum dma_data_direction dir)
+static int omap_gem_dmabuf_end_cpu_access(struct dma_buf *buffer,
+ enum dma_data_direction dir)
{
struct drm_gem_object *obj = buffer->priv;
omap_gem_put_pages(obj);
+ return 0;
}
diff --git a/drivers/gpu/drm/udl/udl_fb.c b/drivers/gpu/drm/udl/udl_fb.c
index c427499133d6..33239a2b264a 100644
--- a/drivers/gpu/drm/udl/udl_fb.c
+++ b/drivers/gpu/drm/udl/udl_fb.c
@@ -423,8 +423,8 @@ static int udl_user_framebuffer_dirty(struct drm_framebuffer *fb,
}
if (ufb->obj->base.import_attach) {
- dma_buf_end_cpu_access(ufb->obj->base.import_attach->dmabuf,
- DMA_FROM_DEVICE);
+ ret = dma_buf_end_cpu_access(ufb->obj->base.import_attach->dmabuf,
+ DMA_FROM_DEVICE);
}
unlock:
diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
index 0754a37c9674..49436b4510f4 100644
--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -1075,14 +1075,16 @@ static int ion_dma_buf_begin_cpu_access(struct dma_buf *dmabuf,
return PTR_ERR_OR_ZERO(vaddr);
}
-static void ion_dma_buf_end_cpu_access(struct dma_buf *dmabuf,
- enum dma_data_direction direction)
+static int ion_dma_buf_end_cpu_access(struct dma_buf *dmabuf,
+ enum dma_data_direction direction)
{
struct ion_buffer *buffer = dmabuf->priv;
mutex_lock(&buffer->lock);
ion_buffer_kmap_put(buffer);
mutex_unlock(&buffer->lock);
+
+ return 0;
}
static struct dma_buf_ops dma_buf_ops = {
diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
index 532108ea0c1c..3fe90d494edb 100644
--- a/include/linux/dma-buf.h
+++ b/include/linux/dma-buf.h
@@ -94,7 +94,7 @@ struct dma_buf_ops {
void (*release)(struct dma_buf *);
int (*begin_cpu_access)(struct dma_buf *, enum dma_data_direction);
- void (*end_cpu_access)(struct dma_buf *, enum dma_data_direction);
+ int (*end_cpu_access)(struct dma_buf *, enum dma_data_direction);
void *(*kmap_atomic)(struct dma_buf *, unsigned long);
void (*kunmap_atomic)(struct dma_buf *, unsigned long, void *);
void *(*kmap)(struct dma_buf *, unsigned long);
@@ -224,8 +224,8 @@ void dma_buf_unmap_attachment(struct dma_buf_attachment *, struct sg_table *,
enum dma_data_direction);
int dma_buf_begin_cpu_access(struct dma_buf *dma_buf,
enum dma_data_direction dir);
-void dma_buf_end_cpu_access(struct dma_buf *dma_buf,
- enum dma_data_direction dir);
+int dma_buf_end_cpu_access(struct dma_buf *dma_buf,
+ enum dma_data_direction dir);
void *dma_buf_kmap_atomic(struct dma_buf *, unsigned long);
void dma_buf_kunmap_atomic(struct dma_buf *, unsigned long, void *);
void *dma_buf_kmap(struct dma_buf *, unsigned long);
diff --git a/include/linux/fence.h b/include/linux/fence.h
index bb522011383b..5aa95eb886f7 100644
--- a/include/linux/fence.h
+++ b/include/linux/fence.h
@@ -292,7 +292,7 @@ static inline bool fence_is_later(struct fence *f1, struct fence *f2)
if (WARN_ON(f1->context != f2->context))
return false;
- return f1->seqno - f2->seqno < INT_MAX;
+ return (int)(f1->seqno - f2->seqno) > 0;
}
/**
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.