int ivtv_udma_setup(struct ivtv *itv, unsigned long ivtv_dest_addr,
void __user *userbuf, int size_in_bytes)
{
struct ivtv_dma_page_info user_dma;
struct ivtv_user_dma *dma = &itv->udma;
int i, err;
IVTV_DEBUG_DMA("ivtv_udma_setup, dst: 0x%08x\n", (unsigned int)ivtv_dest_addr);
/* Still in USE */
if (dma->SG_length || dma->page_count) {
IVTV_DEBUG_WARN("ivtv_udma_setup: SG_length %d page_count %d still full?\n",
dma->SG_length, dma->page_count);
return -EBUSY;
}
ivtv_udma_get_page_info(&user_dma, (unsigned long)userbuf, size_in_bytes);
if (user_dma.page_count <= 0) {
IVTV_DEBUG_WARN("ivtv_udma_setup: Error %d page_count from %d bytes %d offset\n",
user_dma.page_count, size_in_bytes, user_dma.offset);
return -EINVAL;
}
/* Get user pages for DMA Xfer */
down_read(¤t->mm->mmap_sem);
err = get_user_pages(current, current->mm,
user_dma.uaddr, user_dma.page_count, 0, 1, dma->map, NULL);
up_read(¤t->mm->mmap_sem);
if (user_dma.page_count != err) {
IVTV_DEBUG_WARN("failed to map user pages, returned %d instead of %d\n",
err, user_dma.page_count);
return -EINVAL;
}
dma->page_count = user_dma.page_count;
/* Fill SG List with new values */
if (ivtv_udma_fill_sg_list(dma, &user_dma, 0) < 0) {
for (i = 0; i < dma->page_count; i++) {
put_page(dma->map[i]);
}
dma->page_count = 0;
return -ENOMEM;
}
/* Map SG List */
dma->SG_length = pci_map_sg(itv->pdev, dma->SGlist, dma->page_count, PCI_DMA_TODEVICE);
/* Fill SG Array with new values */
ivtv_udma_fill_sg_array (dma, ivtv_dest_addr, 0, -1);
/* Tag SG Array with Interrupt Bit */
dma->SGarray[dma->SG_length - 1].size |= cpu_to_le32(0x80000000);
ivtv_udma_sync_for_device(itv);
return dma->page_count;
}
static int ivtv_yuv_prep_user_dma(struct ivtv *itv, struct ivtv_user_dma *dma,
struct ivtv_dma_frame *args)
{
struct ivtv_dma_page_info y_dma;
struct ivtv_dma_page_info uv_dma;
int i;
int y_pages, uv_pages;
unsigned long y_buffer_offset, uv_buffer_offset;
int y_decode_height, uv_decode_height, y_size;
int frame = atomic_read(&itv->yuv_info.next_fill_frame);
y_buffer_offset = IVTV_DEC_MEM_START + yuv_offset[frame];
uv_buffer_offset = y_buffer_offset + IVTV_YUV_BUFFER_UV_OFFSET;
y_decode_height = uv_decode_height = args->src.height + args->src.top;
if (y_decode_height < 512-16)
y_buffer_offset += 720 * 16;
if (y_decode_height & 15)
y_decode_height = (y_decode_height + 16) & ~15;
if (uv_decode_height & 31)
uv_decode_height = (uv_decode_height + 32) & ~31;
y_size = 720 * y_decode_height;
/* Still in USE */
if (dma->SG_length || dma->page_count) {
IVTV_DEBUG_WARN("prep_user_dma: SG_length %d page_count %d still full?\n",
dma->SG_length, dma->page_count);
return -EBUSY;
}
ivtv_udma_get_page_info (&y_dma, (unsigned long)args->y_source, 720 * y_decode_height);
ivtv_udma_get_page_info (&uv_dma, (unsigned long)args->uv_source, 360 * uv_decode_height);
/* Get user pages for DMA Xfer */
down_read(¤t->mm->mmap_sem);
y_pages = get_user_pages(current, current->mm, y_dma.uaddr, y_dma.page_count, 0, 1, &dma->map[0], NULL);
uv_pages = get_user_pages(current, current->mm, uv_dma.uaddr, uv_dma.page_count, 0, 1, &dma->map[y_pages], NULL);
up_read(¤t->mm->mmap_sem);
dma->page_count = y_dma.page_count + uv_dma.page_count;
if (y_pages + uv_pages != dma->page_count) {
IVTV_DEBUG_WARN("failed to map user pages, returned %d instead of %d\n",
y_pages + uv_pages, dma->page_count);
for (i = 0; i < dma->page_count; i++) {
put_page(dma->map[i]);
}
dma->page_count = 0;
return -EINVAL;
}
/* Fill & map SG List */
ivtv_udma_fill_sg_list (dma, &uv_dma, ivtv_udma_fill_sg_list (dma, &y_dma, 0));
dma->SG_length = pci_map_sg(itv->dev, dma->SGlist, dma->page_count, PCI_DMA_TODEVICE);
/* Fill SG Array with new values */
ivtv_udma_fill_sg_array (dma, y_buffer_offset, uv_buffer_offset, y_size);
/* If we've offset the y plane, ensure top area is blanked */
if (args->src.height + args->src.top < 512-16) {
if (itv->yuv_info.blanking_dmaptr) {
dma->SGarray[dma->SG_length].size = cpu_to_le32(720*16);
dma->SGarray[dma->SG_length].src = cpu_to_le32(itv->yuv_info.blanking_dmaptr);
dma->SGarray[dma->SG_length].dst = cpu_to_le32(IVTV_DEC_MEM_START + yuv_offset[frame]);
dma->SG_length++;
}
}
/* Tag SG Array with Interrupt Bit */
dma->SGarray[dma->SG_length - 1].size |= cpu_to_le32(0x80000000);
ivtv_udma_sync_for_device(itv);
return 0;
}
static int ivtv_yuv_prep_user_dma(struct ivtv *itv, struct ivtv_user_dma *dma,
struct ivtv_dma_frame *args)
{
struct ivtv_dma_page_info y_dma;
struct ivtv_dma_page_info uv_dma;
struct yuv_playback_info *yi = &itv->yuv_info;
u8 frame = yi->draw_frame;
struct yuv_frame_info *f = &yi->new_frame_info[frame];
int i;
int y_pages, uv_pages;
unsigned long y_buffer_offset, uv_buffer_offset;
int y_decode_height, uv_decode_height, y_size;
y_buffer_offset = IVTV_DECODER_OFFSET + yuv_offset[frame];
uv_buffer_offset = y_buffer_offset + IVTV_YUV_BUFFER_UV_OFFSET;
y_decode_height = uv_decode_height = f->src_h + f->src_y;
if (f->offset_y)
y_buffer_offset += 720 * 16;
if (y_decode_height & 15)
y_decode_height = (y_decode_height + 16) & ~15;
if (uv_decode_height & 31)
uv_decode_height = (uv_decode_height + 32) & ~31;
y_size = 720 * y_decode_height;
/* Still in USE */
if (dma->SG_length || dma->page_count) {
IVTV_DEBUG_WARN
("prep_user_dma: SG_length %d page_count %d still full?\n",
dma->SG_length, dma->page_count);
return -EBUSY;
}
ivtv_udma_get_page_info (&y_dma, (unsigned long)args->y_source, 720 * y_decode_height);
ivtv_udma_get_page_info (&uv_dma, (unsigned long)args->uv_source, 360 * uv_decode_height);
/* Get user pages for DMA Xfer */
y_pages = get_user_pages_unlocked(y_dma.uaddr,
y_dma.page_count, &dma->map[0], FOLL_FORCE);
uv_pages = 0; /* silence gcc. value is set and consumed only if: */
if (y_pages == y_dma.page_count) {
uv_pages = get_user_pages_unlocked(uv_dma.uaddr,
uv_dma.page_count, &dma->map[y_pages],
FOLL_FORCE);
}
if (y_pages != y_dma.page_count || uv_pages != uv_dma.page_count) {
int rc = -EFAULT;
if (y_pages == y_dma.page_count) {
IVTV_DEBUG_WARN
("failed to map uv user pages, returned %d "
"expecting %d\n", uv_pages, uv_dma.page_count);
if (uv_pages >= 0) {
for (i = 0; i < uv_pages; i++)
put_page(dma->map[y_pages + i]);
rc = -EFAULT;
} else {
rc = uv_pages;
}
} else {
IVTV_DEBUG_WARN
("failed to map y user pages, returned %d "
"expecting %d\n", y_pages, y_dma.page_count);
}
if (y_pages >= 0) {
for (i = 0; i < y_pages; i++)
put_page(dma->map[i]);
/*
* Inherit the -EFAULT from rc's
* initialization, but allow it to be
* overriden by uv_pages above if it was an
* actual errno.
*/
} else {
rc = y_pages;
}
return rc;
}
dma->page_count = y_pages + uv_pages;
/* Fill & map SG List */
if (ivtv_udma_fill_sg_list (dma, &uv_dma, ivtv_udma_fill_sg_list (dma, &y_dma, 0)) < 0) {
IVTV_DEBUG_WARN("could not allocate bounce buffers for highmem userspace buffers\n");
for (i = 0; i < dma->page_count; i++) {
put_page(dma->map[i]);
}
dma->page_count = 0;
return -ENOMEM;
}
dma->SG_length = pci_map_sg(itv->pdev, dma->SGlist, dma->page_count, PCI_DMA_TODEVICE);
/* Fill SG Array with new values */
ivtv_udma_fill_sg_array(dma, y_buffer_offset, uv_buffer_offset, y_size);
/* If we've offset the y plane, ensure top area is blanked */
if (f->offset_y && yi->blanking_dmaptr) {
dma->SGarray[dma->SG_length].size = cpu_to_le32(720*16);
dma->SGarray[dma->SG_length].src = cpu_to_le32(yi->blanking_dmaptr);
dma->SGarray[dma->SG_length].dst = cpu_to_le32(IVTV_DECODER_OFFSET + yuv_offset[frame]);
dma->SG_length++;
}
/* Tag SG Array with Interrupt Bit */
dma->SGarray[dma->SG_length - 1].size |= cpu_to_le32(0x80000000);
ivtv_udma_sync_for_device(itv);
return 0;
}