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[media] vb2-dma-sg: add dmabuf import support 

Add support for importing dmabuf to videobuf2-dma-sg.

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
Acked-by: Pawel Osciak <pawel@osciak.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Hans Verkuil 2014-11-18 09:51:03 -03:00 committed by Mauro Carvalho Chehab
parent d790b7eda9
commit e078b79d8a
1 changed files with 137 additions and 14 deletions
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151
drivers/media/v4l2-core/videobuf2-dma-sg.c
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@ -41,11 +41,19 @@ struct vb2_dma_sg_buf {
int offset;
enum dma_data_direction dma_dir;
struct sg_table sg_table;
/*
* This will point to sg_table when used with the MMAP or USERPTR
* memory model, and to the dma_buf sglist when used with the
* DMABUF memory model.
*/
struct sg_table *dma_sgt;
size_t size;
unsigned int num_pages;
atomic_t refcount;
struct vb2_vmarea_handler handler;
struct vm_area_struct *vma;
struct dma_buf_attachment *db_attach;
};
static void vb2_dma_sg_put(void *buf_priv);
@ -112,6 +120,7 @@ static void *vb2_dma_sg_alloc(void *alloc_ctx, unsigned long size,
buf->size = size;
/* size is already page aligned */
buf->num_pages = size >> PAGE_SHIFT;
buf->dma_sgt = &buf->sg_table;
buf->pages = kzalloc(buf->num_pages * sizeof(struct page *),
GFP_KERNEL);
@ -122,7 +131,7 @@ static void *vb2_dma_sg_alloc(void *alloc_ctx, unsigned long size,
if (ret)
goto fail_pages_alloc;
ret = sg_alloc_table_from_pages(&buf->sg_table, buf->pages,
ret = sg_alloc_table_from_pages(buf->dma_sgt, buf->pages,
buf->num_pages, 0, size, GFP_KERNEL);
if (ret)
goto fail_table_alloc;
@ -147,7 +156,7 @@ static void *vb2_dma_sg_alloc(void *alloc_ctx, unsigned long size,
fail_map:
put_device(buf->dev);
sg_free_table(sgt);
sg_free_table(buf->dma_sgt);
fail_table_alloc:
num_pages = buf->num_pages;
while (num_pages--)
@ -171,7 +180,7 @@ static void vb2_dma_sg_put(void *buf_priv)
dma_unmap_sg(buf->dev, sgt->sgl, sgt->nents, buf->dma_dir);
if (buf->vaddr)
vm_unmap_ram(buf->vaddr, buf->num_pages);
sg_free_table(&buf->sg_table);
sg_free_table(buf->dma_sgt);
while (--i >= 0)
__free_page(buf->pages[i]);
kfree(buf->pages);
@ -183,7 +192,11 @@ static void vb2_dma_sg_put(void *buf_priv)
static void vb2_dma_sg_prepare(void *buf_priv)
{
struct vb2_dma_sg_buf *buf = buf_priv;
struct sg_table *sgt = &buf->sg_table;
struct sg_table *sgt = buf->dma_sgt;
/* DMABUF exporter will flush the cache for us */
if (buf->db_attach)
return;
dma_sync_sg_for_device(buf->dev, sgt->sgl, sgt->nents, buf->dma_dir);
}
@ -191,7 +204,11 @@ static void vb2_dma_sg_prepare(void *buf_priv)
static void vb2_dma_sg_finish(void *buf_priv)
{
struct vb2_dma_sg_buf *buf = buf_priv;
struct sg_table *sgt = &buf->sg_table;
struct sg_table *sgt = buf->dma_sgt;
/* DMABUF exporter will flush the cache for us */
if (buf->db_attach)
return;
dma_sync_sg_for_cpu(buf->dev, sgt->sgl, sgt->nents, buf->dma_dir);
}
@ -221,6 +238,7 @@ static void *vb2_dma_sg_get_userptr(void *alloc_ctx, unsigned long vaddr,
buf->dma_dir = dma_dir;
buf->offset = vaddr & ~PAGE_MASK;
buf->size = size;
buf->dma_sgt = &buf->sg_table;
first = (vaddr & PAGE_MASK) >> PAGE_SHIFT;
last = ((vaddr + size - 1) & PAGE_MASK) >> PAGE_SHIFT;
@ -273,7 +291,7 @@ static void *vb2_dma_sg_get_userptr(void *alloc_ctx, unsigned long vaddr,
if (num_pages_from_user != buf->num_pages)
goto userptr_fail_get_user_pages;
if (sg_alloc_table_from_pages(&buf->sg_table, buf->pages,
if (sg_alloc_table_from_pages(buf->dma_sgt, buf->pages,
buf->num_pages, buf->offset, size, 0))
goto userptr_fail_alloc_table_from_pages;
@ -315,7 +333,7 @@ static void vb2_dma_sg_put_userptr(void *buf_priv)
dma_unmap_sg(buf->dev, sgt->sgl, sgt->nents, buf->dma_dir);
if (buf->vaddr)
vm_unmap_ram(buf->vaddr, buf->num_pages);
sg_free_table(&buf->sg_table);
sg_free_table(buf->dma_sgt);
while (--i >= 0) {
if (buf->dma_dir == DMA_FROM_DEVICE)
set_page_dirty_lock(buf->pages[i]);
@ -333,14 +351,16 @@ static void *vb2_dma_sg_vaddr(void *buf_priv)
BUG_ON(!buf);
if (!buf->vaddr)
buf->vaddr = vm_map_ram(buf->pages,
buf->num_pages,
-1,
PAGE_KERNEL);
if (!buf->vaddr) {
if (buf->db_attach)
buf->vaddr = dma_buf_vmap(buf->db_attach->dmabuf);
else
buf->vaddr = vm_map_ram(buf->pages,
buf->num_pages, -1, PAGE_KERNEL);
}
/* add offset in case userptr is not page-aligned */
return buf->vaddr + buf->offset;
return buf->vaddr ? buf->vaddr + buf->offset : NULL;
}
static unsigned int vb2_dma_sg_num_users(void *buf_priv)
@ -387,11 +407,110 @@ static int vb2_dma_sg_mmap(void *buf_priv, struct vm_area_struct *vma)
return 0;
}
/*********************************************/
/* callbacks for DMABUF buffers */
/*********************************************/
static int vb2_dma_sg_map_dmabuf(void *mem_priv)
{
struct vb2_dma_sg_buf *buf = mem_priv;
struct sg_table *sgt;
if (WARN_ON(!buf->db_attach)) {
pr_err("trying to pin a non attached buffer\n");
return -EINVAL;
}
if (WARN_ON(buf->dma_sgt)) {
pr_err("dmabuf buffer is already pinned\n");
return 0;
}
/* get the associated scatterlist for this buffer */
sgt = dma_buf_map_attachment(buf->db_attach, buf->dma_dir);
if (IS_ERR(sgt)) {
pr_err("Error getting dmabuf scatterlist\n");
return -EINVAL;
}
buf->dma_sgt = sgt;
buf->vaddr = NULL;
return 0;
}
static void vb2_dma_sg_unmap_dmabuf(void *mem_priv)
{
struct vb2_dma_sg_buf *buf = mem_priv;
struct sg_table *sgt = buf->dma_sgt;
if (WARN_ON(!buf->db_attach)) {
pr_err("trying to unpin a not attached buffer\n");
return;
}
if (WARN_ON(!sgt)) {
pr_err("dmabuf buffer is already unpinned\n");
return;
}
if (buf->vaddr) {
dma_buf_vunmap(buf->db_attach->dmabuf, buf->vaddr);
buf->vaddr = NULL;
}
dma_buf_unmap_attachment(buf->db_attach, sgt, buf->dma_dir);
buf->dma_sgt = NULL;
}
static void vb2_dma_sg_detach_dmabuf(void *mem_priv)
{
struct vb2_dma_sg_buf *buf = mem_priv;
/* if vb2 works correctly you should never detach mapped buffer */
if (WARN_ON(buf->dma_sgt))
vb2_dma_sg_unmap_dmabuf(buf);
/* detach this attachment */
dma_buf_detach(buf->db_attach->dmabuf, buf->db_attach);
kfree(buf);
}
static void *vb2_dma_sg_attach_dmabuf(void *alloc_ctx, struct dma_buf *dbuf,
unsigned long size, enum dma_data_direction dma_dir)
{
struct vb2_dma_sg_conf *conf = alloc_ctx;
struct vb2_dma_sg_buf *buf;
struct dma_buf_attachment *dba;
if (dbuf->size < size)
return ERR_PTR(-EFAULT);
buf = kzalloc(sizeof(*buf), GFP_KERNEL);
if (!buf)
return ERR_PTR(-ENOMEM);
buf->dev = conf->dev;
/* create attachment for the dmabuf with the user device */
dba = dma_buf_attach(dbuf, buf->dev);
if (IS_ERR(dba)) {
pr_err("failed to attach dmabuf\n");
kfree(buf);
return dba;
}
buf->dma_dir = dma_dir;
buf->size = size;
buf->db_attach = dba;
return buf;
}
static void *vb2_dma_sg_cookie(void *buf_priv)
{
struct vb2_dma_sg_buf *buf = buf_priv;
return &buf->sg_table;
return buf->dma_sgt;
}
const struct vb2_mem_ops vb2_dma_sg_memops = {
@ -404,6 +523,10 @@ const struct vb2_mem_ops vb2_dma_sg_memops = {
.vaddr = vb2_dma_sg_vaddr,
.mmap = vb2_dma_sg_mmap,
.num_users = vb2_dma_sg_num_users,
.map_dmabuf = vb2_dma_sg_map_dmabuf,
.unmap_dmabuf = vb2_dma_sg_unmap_dmabuf,
.attach_dmabuf = vb2_dma_sg_attach_dmabuf,
.detach_dmabuf = vb2_dma_sg_detach_dmabuf,
.cookie = vb2_dma_sg_cookie,
};
EXPORT_SYMBOL_GPL(vb2_dma_sg_memops);