The object already stores (computed on the fly) the index to dma address
so use it instead of reallocating a large temporary array every time we
bind a rotated framebuffer.
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.william.a...@gmail.com>
Cc: Joonas Lahtinen <joonas.lahti...@linux.intel.com>
Cc: Tvrtko Ursulin <tvrtko.ursu...@intel.com>
---
drivers/gpu/drm/i915/i915_gem_gtt.c | 77 ++++++++++++-------------------------
1 file changed, 25 insertions(+), 52 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem_gtt.c
b/drivers/gpu/drm/i915/i915_gem_gtt.c
index 47a38272f54c..848dbb926fd1 100644
--- a/drivers/gpu/drm/i915/i915_gem_gtt.c
+++ b/drivers/gpu/drm/i915/i915_gem_gtt.c
@@ -3043,27 +3043,32 @@ void i915_gem_restore_gtt_mappings(struct
drm_i915_private *dev_priv)
}
static struct scatterlist *
-rotate_pages(const dma_addr_t *in, unsigned int offset,
- unsigned int width, unsigned int height,
- unsigned int stride,
+rotate_pages(struct drm_i915_gem_object *obj,
+ const struct intel_rotation_plane_info *p,
struct sg_table *st, struct scatterlist *sg)
{
unsigned int column, row;
- unsigned int src_idx;
- for (column = 0; column < width; column++) {
- src_idx = stride * (height - 1) + column;
- for (row = 0; row < height; row++) {
- st->nents++;
+ for (column = 0; column < p->width; column++) {
+ unsigned long src_idx =
+ p->stride * (p->height - 1) + column + p->offset;
+ for (row = 0; row < p->height; row++) {
+ struct scatterlist *src;
+ unsigned int n;
+
+ src = i915_gem_object_get_sg(obj, src_idx, &n);
+ src_idx -= p->stride;
+
/* We don't need the pages, but need to initialize
* the entries so the sg list can be happily traversed.
* The only thing we need are DMA addresses.
*/
sg_set_page(sg, NULL, PAGE_SIZE, 0);
- sg_dma_address(sg) = in[offset + src_idx];
+ sg_dma_address(sg) = sg_dma_address(src) + n*PAGE_SIZE;
sg_dma_len(sg) = PAGE_SIZE;
- sg = sg_next(sg);
- src_idx -= stride;
+ sg = __sg_next(sg);
+
+ st->nents++;
}
}
@@ -3074,62 +3079,30 @@ static noinline struct sg_table *
intel_rotate_pages(struct intel_rotation_info *rot_info,
struct drm_i915_gem_object *obj)
{
- const unsigned long n_pages = obj->base.size / PAGE_SIZE;
- unsigned int size = intel_rotation_info_size(rot_info);
- struct sgt_iter sgt_iter;
- dma_addr_t dma_addr;
- unsigned long i;
- dma_addr_t *page_addr_list;
- struct sg_table *st;
+ const unsigned int size = intel_rotation_info_size(rot_info);
struct scatterlist *sg;
+ struct sg_table *st;
+ unsigned long i;
int ret = -ENOMEM;
- /* Allocate a temporary list of source pages for random access. */
- page_addr_list = drm_malloc_gfp(n_pages,
- sizeof(dma_addr_t),
- GFP_TEMPORARY);
- if (!page_addr_list)
- return ERR_PTR(ret);
-
- /* Allocate target SG list. */
st = kmalloc(sizeof(*st), GFP_KERNEL);
if (!st)
- goto err_st_alloc;
+ goto err;
ret = sg_alloc_table(st, size, GFP_KERNEL);
if (ret)
- goto err_sg_alloc;
-
- /* Populate source page list from the object. */
- i = 0;
- for_each_sgt_dma(dma_addr, sgt_iter, obj->mm.pages)
- page_addr_list[i++] = dma_addr;
+ goto err;
- GEM_BUG_ON(i != n_pages);
st->nents = 0;
sg = st->sgl;
-
- for (i = 0 ; i < ARRAY_SIZE(rot_info->plane); i++) {
- sg = rotate_pages(page_addr_list, rot_info->plane[i].offset,
- rot_info->plane[i].width,
rot_info->plane[i].height,
- rot_info->plane[i].stride, st, sg);
- }
-
- DRM_DEBUG_KMS("Created rotated page mapping for object size %zu (%ux%u
tiles, %u pages)\n",
- obj->base.size, rot_info->plane[0].width,
rot_info->plane[0].height, size);
-
- drm_free_large(page_addr_list);
+ for (i = 0 ; i < ARRAY_SIZE(rot_info->plane); i++)
+ sg = rotate_pages(obj, &rot_info->plane[i], st, sg);
+ GEM_BUG_ON(st->nents != size);
return st;
-err_sg_alloc:
+err:
kfree(st);
-err_st_alloc:
- drm_free_large(page_addr_list);
-
- DRM_DEBUG_KMS("Failed to create rotated mapping for object size %zu!
(%ux%u tiles, %u pages)\n",
- obj->base.size, rot_info->plane[0].width,
rot_info->plane[0].height, size);
-
return ERR_PTR(ret);
}
--
2.11.0
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