#include <media/videobuf2-memops.h>
#include <media/videobuf2-dma-sg.h>
+static int debug;
+module_param(debug, int, 0644);
+
+#define dprintk(level, fmt, arg...) \
+ do { \
+ if (debug >= level) \
+ printk(KERN_DEBUG "vb2-dma-sg: " fmt, ## arg); \
+ } while (0)
+
struct vb2_dma_sg_buf {
void *vaddr;
struct page **pages;
static void vb2_dma_sg_put(void *buf_priv);
-static void *vb2_dma_sg_alloc(void *alloc_ctx, unsigned long size)
+static void *vb2_dma_sg_alloc(void *alloc_ctx, unsigned long size, gfp_t gfp_flags)
{
struct vb2_dma_sg_buf *buf;
int i;
buf->write = 0;
buf->offset = 0;
buf->sg_desc.size = size;
- buf->sg_desc.num_pages = (size + PAGE_SIZE - 1) >> PAGE_SHIFT;
+ /* size is already page aligned */
+ buf->sg_desc.num_pages = size >> PAGE_SHIFT;
buf->sg_desc.sglist = vzalloc(buf->sg_desc.num_pages *
sizeof(*buf->sg_desc.sglist));
goto fail_pages_array_alloc;
for (i = 0; i < buf->sg_desc.num_pages; ++i) {
- buf->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO | __GFP_NOWARN);
+ buf->pages[i] = alloc_page(GFP_KERNEL | __GFP_ZERO |
+ __GFP_NOWARN | gfp_flags);
if (NULL == buf->pages[i])
goto fail_pages_alloc;
sg_set_page(&buf->sg_desc.sglist[i],
atomic_inc(&buf->refcount);
- printk(KERN_DEBUG "%s: Allocated buffer of %d pages\n",
+ dprintk(1, "%s: Allocated buffer of %d pages\n",
__func__, buf->sg_desc.num_pages);
return buf;
int i = buf->sg_desc.num_pages;
if (atomic_dec_and_test(&buf->refcount)) {
- printk(KERN_DEBUG "%s: Freeing buffer of %d pages\n", __func__,
+ dprintk(1, "%s: Freeing buffer of %d pages\n", __func__,
buf->sg_desc.num_pages);
if (buf->vaddr)
vm_unmap_ram(buf->vaddr, buf->sg_desc.num_pages);
return buf;
userptr_fail_get_user_pages:
- printk(KERN_DEBUG "get_user_pages requested/got: %d/%d]\n",
+ dprintk(1, "get_user_pages requested/got: %d/%d]\n",
num_pages_from_user, buf->sg_desc.num_pages);
while (--num_pages_from_user >= 0)
put_page(buf->pages[num_pages_from_user]);
struct vb2_dma_sg_buf *buf = buf_priv;
int i = buf->sg_desc.num_pages;
- printk(KERN_DEBUG "%s: Releasing userspace buffer of %d pages\n",
+ dprintk(1, "%s: Releasing userspace buffer of %d pages\n",
__func__, buf->sg_desc.num_pages);
if (buf->vaddr)
vm_unmap_ram(buf->vaddr, buf->sg_desc.num_pages);