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Date: Thu, 2 Mar 2017 13:44:36 -0800
From: Laura Abbott <labbott@...hat.com>
To: Sumit Semwal <sumit.semwal@...aro.org>,
Riley Andrews <riandrews@...roid.com>, arve@...roid.com
Cc: Laura Abbott <labbott@...hat.com>, romlem@...gle.com,
devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org,
linaro-mm-sig@...ts.linaro.org,
Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-arm-kernel@...ts.infradead.org, linux-media@...r.kernel.org,
dri-devel@...ts.freedesktop.org,
Brian Starkey <brian.starkey@....com>,
Daniel Vetter <daniel.vetter@...el.com>,
Mark Brown <broonie@...nel.org>,
Benjamin Gaignard <benjamin.gaignard@...aro.org>,
linux-mm@...ck.org
Subject: [RFC PATCH 04/12] staging: android: ion: Call dma_map_sg for syncing and mapping
Technically, calling dma_buf_map_attachment should return a buffer
properly dma_mapped. Add calls to dma_map_sg to begin_cpu_access to
ensure this happens. As a side effect, this lets Ion buffers take
advantage of the dma_buf sync ioctls.
Signed-off-by: Laura Abbott <labbott@...hat.com>
---
drivers/staging/android/ion/ion.c | 101 +++++++++++++++++++-------------------
1 file changed, 50 insertions(+), 51 deletions(-)
diff --git a/drivers/staging/android/ion/ion.c b/drivers/staging/android/ion/ion.c
index ce4adac..a931b30 100644
--- a/drivers/staging/android/ion/ion.c
+++ b/drivers/staging/android/ion/ion.c
@@ -795,10 +795,6 @@ void ion_client_destroy(struct ion_client *client)
}
EXPORT_SYMBOL(ion_client_destroy);
-static void ion_buffer_sync_for_device(struct ion_buffer *buffer,
- struct device *dev,
- enum dma_data_direction direction);
-
static struct sg_table *dup_sg_table(struct sg_table *table)
{
struct sg_table *new_table;
@@ -825,22 +821,43 @@ static struct sg_table *dup_sg_table(struct sg_table *table)
return new_table;
}
+static void free_duped_table(struct sg_table *table)
+{
+ sg_free_table(table);
+ kfree(table);
+}
+
static struct sg_table *ion_map_dma_buf(struct dma_buf_attachment *attachment,
enum dma_data_direction direction)
{
struct dma_buf *dmabuf = attachment->dmabuf;
struct ion_buffer *buffer = dmabuf->priv;
+ struct sg_table *table;
+ int ret;
+
+ /*
+ * TODO: Need to sync wrt CPU or device completely owning?
+ */
+
+ table = dup_sg_table(buffer->sg_table);
- ion_buffer_sync_for_device(buffer, attachment->dev, direction);
- return dup_sg_table(buffer->sg_table);
+ if (!dma_map_sg(attachment->dev, table->sgl, table->nents,
+ direction)){
+ ret = -ENOMEM;
+ goto err;
+ }
+
+err:
+ free_duped_table(table);
+ return ERR_PTR(ret);
}
static void ion_unmap_dma_buf(struct dma_buf_attachment *attachment,
struct sg_table *table,
enum dma_data_direction direction)
{
- sg_free_table(table);
- kfree(table);
+ dma_unmap_sg(attachment->dev, table->sgl, table->nents, direction);
+ free_duped_table(table);
}
void ion_pages_sync_for_device(struct device *dev, struct page *page,
@@ -864,38 +881,6 @@ struct ion_vma_list {
struct vm_area_struct *vma;
};
-static void ion_buffer_sync_for_device(struct ion_buffer *buffer,
- struct device *dev,
- enum dma_data_direction dir)
-{
- struct ion_vma_list *vma_list;
- int pages = PAGE_ALIGN(buffer->size) / PAGE_SIZE;
- int i;
-
- pr_debug("%s: syncing for device %s\n", __func__,
- dev ? dev_name(dev) : "null");
-
- if (!ion_buffer_fault_user_mappings(buffer))
- return;
-
- mutex_lock(&buffer->lock);
- for (i = 0; i < pages; i++) {
- struct page *page = buffer->pages[i];
-
- if (ion_buffer_page_is_dirty(page))
- ion_pages_sync_for_device(dev, ion_buffer_page(page),
- PAGE_SIZE, dir);
-
- ion_buffer_page_clean(buffer->pages + i);
- }
- list_for_each_entry(vma_list, &buffer->vmas, list) {
- struct vm_area_struct *vma = vma_list->vma;
-
- zap_page_range(vma, vma->vm_start, vma->vm_end - vma->vm_start);
- }
- mutex_unlock(&buffer->lock);
-}
-
static int ion_vm_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
{
struct ion_buffer *buffer = vma->vm_private_data;
@@ -1014,16 +999,24 @@ static int ion_dma_buf_begin_cpu_access(struct dma_buf *dmabuf,
struct ion_buffer *buffer = dmabuf->priv;
void *vaddr;
- if (!buffer->heap->ops->map_kernel) {
- pr_err("%s: map kernel is not implemented by this heap.\n",
- __func__);
- return -ENODEV;
+ /*
+ * TODO: Move this elsewhere because we don't always need a vaddr
+ */
+ if (buffer->heap->ops->map_kernel) {
+ mutex_lock(&buffer->lock);
+ vaddr = ion_buffer_kmap_get(buffer);
+ mutex_unlock(&buffer->lock);
}
- mutex_lock(&buffer->lock);
- vaddr = ion_buffer_kmap_get(buffer);
- mutex_unlock(&buffer->lock);
- return PTR_ERR_OR_ZERO(vaddr);
+ /*
+ * Close enough right now? Flag to skip sync?
+ */
+ if (!dma_map_sg(buffer->dev->dev.this_device, buffer->sg_table->sgl,
+ buffer->sg_table->nents,
+ DMA_BIDIRECTIONAL))
+ return -ENOMEM;
+
+ return 0;
}
static int ion_dma_buf_end_cpu_access(struct dma_buf *dmabuf,
@@ -1031,9 +1024,15 @@ static int ion_dma_buf_end_cpu_access(struct dma_buf *dmabuf,
{
struct ion_buffer *buffer = dmabuf->priv;
- mutex_lock(&buffer->lock);
- ion_buffer_kmap_put(buffer);
- mutex_unlock(&buffer->lock);
+ if (buffer->heap->ops->map_kernel) {
+ mutex_lock(&buffer->lock);
+ ion_buffer_kmap_put(buffer);
+ mutex_unlock(&buffer->lock);
+ }
+
+ dma_unmap_sg(buffer->dev->dev.this_device, buffer->sg_table->sgl,
+ buffer->sg_table->nents,
+ DMA_BIDIRECTIONAL);
return 0;
}
--
2.7.4
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