/*
* Build all info and do all mappings required for a blit.
*/
static int
via_build_sg_info(struct drm_device *dev, drm_via_sg_info_t *vsg,
drm_via_dmablit_t *xfer)
{
int ret = 0;
vsg->bounce_buffer = NULL;
vsg->state = dr_via_sg_init;
if (xfer->num_lines <= 0 || xfer->line_length <= 0) {
DRM_ERROR("Zero size bitblt.\n");
return -EINVAL;
}
/*
* Below check is a driver limitation, not a hardware one. We
* don't want to lock unused pages, and don't want to incoporate the
* extra logic of avoiding them. Make sure there are no.
* (Not a big limitation anyway.)
*/
if ((xfer->mem_stride - xfer->line_length) > 2 * PAGE_SIZE) {
DRM_ERROR("Too large system memory stride. Stride: %d, "
"Length: %d\n", xfer->mem_stride, xfer->line_length);
return -EINVAL;
}
if ((xfer->mem_stride == xfer->line_length) &&
(xfer->fb_stride == xfer->line_length)) {
xfer->mem_stride *= xfer->num_lines;
xfer->line_length = xfer->mem_stride;
xfer->fb_stride = xfer->mem_stride;
xfer->num_lines = 1;
}
/*
* Don't lock an arbitrary large number of pages, since that causes a
* DOS security hole.
*/
if (xfer->num_lines > 2048 ||
(xfer->num_lines*xfer->mem_stride > (2048*2048*4))) {
DRM_ERROR("Too large PCI DMA bitblt.\n");
return -EINVAL;
}
/*
* we allow a negative fb stride to allow flipping of images in
* transfer.
*/
if (xfer->mem_stride < xfer->line_length ||
abs(xfer->fb_stride) < xfer->line_length) {
DRM_ERROR("Invalid frame-buffer / memory stride.\n");
return -EINVAL;
}
/*
* A hardware bug seems to be worked around if system memory addresses
* start on 16 byte boundaries. This seems a bit restrictive however.
* VIA is contacted about this. Meanwhile, impose the following
* restrictions:
*/
#ifdef VIA_BUGFREE
if ((((unsigned long)xfer->mem_addr & 3) !=
((unsigned long)xfer->fb_addr & 3)) ||
((xfer->num_lines > 1) && ((xfer->mem_stride & 3) !=
(xfer->fb_stride & 3)))) {
DRM_ERROR("Invalid DRM bitblt alignment.\n");
return -EINVAL;
}
#else
if ((((unsigned long)xfer->mem_addr & 15) ||
((unsigned long)xfer->fb_addr & 3)) ||
((xfer->num_lines > 1) &&
((xfer->mem_stride & 15) || (xfer->fb_stride & 3)))) {
DRM_ERROR("Invalid DRM bitblt alignment.\n");
return -EINVAL;
}
#endif
if (0 != (ret = via_lock_all_dma_pages(vsg, xfer))) {
DRM_ERROR("Could not lock DMA pages.\n");
via_free_sg_info(vsg);
return ret;
}
via_map_blit_for_device(xfer, vsg, 0);
if (0 != (ret = via_alloc_desc_pages(vsg))) {
DRM_ERROR("Could not allocate DMA descriptor pages.\n");
via_free_sg_info(vsg);
return ret;
}
via_map_blit_for_device(xfer, vsg, 1);
return 0;
}
static int
via_build_sg_info(drm_device_t *dev, drm_via_sg_info_t *vsg, drm_via_dmablit_t *xfer)
{
int draw = xfer->to_fb;
int ret = 0;
vsg->direction = (draw) ? DMA_TO_DEVICE : DMA_FROM_DEVICE;
vsg->bounce_buffer = 0;
vsg->state = dr_via_sg_init;
if (xfer->num_lines <= 0 || xfer->line_length <= 0) {
DRM_ERROR("Zero size bitblt.\n");
return DRM_ERR(EINVAL);
}
/*
* Below check is a driver limitation, not a hardware one. We
* don't want to lock unused pages, and don't want to incoporate the
* extra logic of avoiding them. Make sure there are no.
* (Not a big limitation anyway.)
*/
if (((xfer->mem_stride - xfer->line_length) >= PAGE_SIZE) ||
(xfer->mem_stride > 2048)) {
DRM_ERROR("Too large system memory stride.\n");
return DRM_ERR(EINVAL);
}
if (xfer->num_lines > 2048) {
DRM_ERROR("Too many PCI DMA bitblt lines.\n");
return DRM_ERR(EINVAL);
}
/*
* we allow a negative fb stride to allow flipping of images in
* transfer.
*/
if (xfer->mem_stride < xfer->line_length ||
abs(xfer->fb_stride) < xfer->line_length) {
DRM_ERROR("Invalid frame-buffer / memory stride.\n");
return DRM_ERR(EINVAL);
}
/*
* A hardware bug seems to be worked around if system memory addresses start on
* 16 byte boundaries. This seems a bit restrictive however. VIA is contacted
* about this. Meanwhile, impose the following restrictions:
*/
#ifdef VIA_BUGFREE
if ((((unsigned long)xfer->mem_addr & 3) != ((unsigned long)xfer->fb_addr & 3)) ||
((xfer->mem_stride & 3) != (xfer->fb_stride & 3))) {
DRM_ERROR("Invalid DRM bitblt alignment.\n");
return DRM_ERR(EINVAL);
}
#else
if ((((unsigned long)xfer->mem_addr & 15) || ((unsigned long)xfer->fb_addr & 15))) {
DRM_ERROR("Invalid DRM bitblt alignment.\n");
return DRM_ERR(EINVAL);
}
#endif
if (0 != (ret = via_lock_all_dma_pages(vsg, xfer))) {
DRM_ERROR("Could not lock DMA pages.\n");
via_free_sg_info(dev->pdev, vsg);
return ret;
}
via_map_blit_for_device(dev->pdev, xfer, vsg, 0);
if (0 != (ret = via_alloc_desc_pages(vsg))) {
DRM_ERROR("Could not allocate DMA descriptor pages.\n");
via_free_sg_info(dev->pdev, vsg);
return ret;
}
via_map_blit_for_device(dev->pdev, xfer, vsg, 1);
return 0;
}