From: Laura Abbott labbott@fedoraproject.org
dma_buf added support for a userspace syncing ioctl. It is implemented by calling dma_buf_begin_cpu_access and dma_buf_end_cpu_access. Ion currently lacks cache operations on this code path. Add them for compatibility with the dma_buf ioctl.
Signed-off-by: Laura Abbott labbott@redhat.com --- drivers/staging/android/ion/ion.c | 31 +++++++++++++++++++++++++++++++ 1 file changed, 31 insertions(+)
diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c index 5cbe22e..8153af3 100644 --- a/drivers/staging/android/ion/ion.c +++ b/drivers/staging/android/ion/ion.c @@ -1109,6 +1109,24 @@ static void ion_dma_buf_kunmap(struct dma_buf *dmabuf, unsigned long offset, { }
+static void ion_clean_buffer(struct ion_buffer *buffer) +{ + struct scatterlist *sg; + int i; + + for_each_sg(buffer->sg_table->sgl, sg, buffer->sg_table->orig_nents, i) + kernel_force_cache_clean(sg_page(sg), sg->length); +} + +static void ion_invalidate_buffer(struct ion_buffer *buffer) +{ + struct scatterlist *sg; + int i; + + for_each_sg(buffer->sg_table->sgl, sg, buffer->sg_table->orig_nents, i) + kernel_force_cache_invalidate(sg_page(sg), sg->length); +} + static int ion_dma_buf_begin_cpu_access(struct dma_buf *dmabuf, enum dma_data_direction direction) { @@ -1124,6 +1142,11 @@ static int ion_dma_buf_begin_cpu_access(struct dma_buf *dmabuf, mutex_lock(&buffer->lock); vaddr = ion_buffer_kmap_get(buffer); mutex_unlock(&buffer->lock); + + if (direction != DMA_TO_DEVICE) { + ion_invalidate_buffer(buffer); + } + return PTR_ERR_OR_ZERO(vaddr); }
@@ -1136,6 +1159,12 @@ static int ion_dma_buf_end_cpu_access(struct dma_buf *dmabuf, ion_buffer_kmap_put(buffer); mutex_unlock(&buffer->lock);
+ if (direction == DMA_FROM_DEVICE) { + ion_invalidate_buffer(buffer); + } else { + ion_clean_buffer(buffer); + } + return 0; }
@@ -1266,6 +1295,8 @@ static int ion_sync_for_device(struct ion_client *client, int fd) struct dma_buf *dmabuf; struct ion_buffer *buffer;
+ WARN_ONCE(1, "This API is deprecated in favor of the dma_buf ioctl\n"); + dmabuf = dma_buf_get(fd); if (IS_ERR(dmabuf)) return PTR_ERR(dmabuf);