diff options
Diffstat (limited to 'drivers/gpu/drm/i915/i915_mm.c')
| -rw-r--r-- | drivers/gpu/drm/i915/i915_mm.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/gpu/drm/i915/i915_mm.c b/drivers/gpu/drm/i915/i915_mm.c index 7998bc74ab49..f5c97a620962 100644 --- a/drivers/gpu/drm/i915/i915_mm.c +++ b/drivers/gpu/drm/i915/i915_mm.c @@ -122,13 +122,15 @@ int remap_io_mapping(struct vm_area_struct *vma, * @addr: target user address to start at * @size: size of map area * @sgl: Start sg entry + * @offset: offset from the start of the page * @iobase: Use stored dma address offset by this address or pfn if -1 * * Note: this is only safe if the mm semaphore is held when called. */ int remap_io_sg(struct vm_area_struct *vma, unsigned long addr, unsigned long size, - struct scatterlist *sgl, resource_size_t iobase) + struct scatterlist *sgl, unsigned long offset, + resource_size_t iobase) { struct remap_pfn r = { .mm = vma->vm_mm, @@ -141,6 +143,14 @@ int remap_io_sg(struct vm_area_struct *vma, /* We rely on prevalidation of the io-mapping to skip track_pfn(). */ GEM_BUG_ON((vma->vm_flags & EXPECTED_FLAGS) != EXPECTED_FLAGS); + while (offset >= sg_dma_len(r.sgt.sgp) >> PAGE_SHIFT) { + offset -= sg_dma_len(r.sgt.sgp) >> PAGE_SHIFT; + r.sgt = __sgt_iter(__sg_next(r.sgt.sgp), use_dma(iobase)); + if (!r.sgt.sgp) + return -EINVAL; + } + r.sgt.curr = offset << PAGE_SHIFT; + if (!use_dma(iobase)) flush_cache_range(vma, addr, size); |