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drm/i915: Fix i915_sg_page_sizes to record dma segments rather than physical pages

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All users of this function actually want the dma segment sizes, but that's
not what's calculated. Fix that and rename the function to
i915_sg_dma_sizes to reflect what's calculated.

Signed-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
Reviewed-by: Matthew Auld <matthew.auld@intel.com>
Signed-off-by: Matthew Auld <matthew.auld@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20210601074654.3103-4-thomas.hellstrom@linux.intel.com
This commit is contained in:
Thomas Hellström 2021-06-01 09:46:42 +02:00 committed by Matthew Auld
parent 4d8151ae53
commit 62445a97c5
4 changed files with 15 additions and 7 deletions
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2
drivers/gpu/drm/i915/gem/i915_gem_dmabuf.c
View File

@ -209,7 +209,7 @@ static int i915_gem_object_get_pages_dmabuf(struct drm_i915_gem_object *obj)
if (IS_ERR(pages))
return PTR_ERR(pages);
sg_page_sizes = i915_sg_page_sizes(pages->sgl);
sg_page_sizes = i915_sg_dma_sizes(pages->sgl);
__i915_gem_object_set_pages(obj, pages, sg_page_sizes);

2
drivers/gpu/drm/i915/gem/i915_gem_phys.c
View File

@ -208,7 +208,7 @@ static int i915_gem_object_shmem_to_phys(struct drm_i915_gem_object *obj)
err_xfer:
if (!IS_ERR_OR_NULL(pages)) {
unsigned int sg_page_sizes = i915_sg_page_sizes(pages->sgl);
unsigned int sg_page_sizes = i915_sg_dma_sizes(pages->sgl);
__i915_gem_object_set_pages(obj, pages, sg_page_sizes);
}

2
drivers/gpu/drm/i915/gem/i915_gem_userptr.c
View File

@ -173,7 +173,7 @@ alloc_table:
goto err;
}
sg_page_sizes = i915_sg_page_sizes(st->sgl);
sg_page_sizes = i915_sg_dma_sizes(st->sgl);
__i915_gem_object_set_pages(obj, st, sg_page_sizes);

16
drivers/gpu/drm/i915/i915_scatterlist.h
View File

@ -101,15 +101,23 @@ static inline struct scatterlist *__sg_next(struct scatterlist *sg)
(((__iter).curr += PAGE_SIZE) >= (__iter).max) ? \
(__iter) = __sgt_iter(__sg_next((__iter).sgp), false), 0 : 0)
static inline unsigned int i915_sg_page_sizes(struct scatterlist *sg)
/**
* i915_sg_dma_sizes - Record the dma segment sizes of a scatterlist
* @sg: The scatterlist
*
* Return: An unsigned int with segment sizes logically or'ed together.
* A caller can use this information to determine what hardware page table
* entry sizes can be used to map the memory represented by the scatterlist.
*/
static inline unsigned int i915_sg_dma_sizes(struct scatterlist *sg)
{
unsigned int page_sizes;
page_sizes = 0;
while (sg) {
while (sg && sg_dma_len(sg)) {
GEM_BUG_ON(sg->offset);
GEM_BUG_ON(!IS_ALIGNED(sg->length, PAGE_SIZE));
page_sizes |= sg->length;
GEM_BUG_ON(!IS_ALIGNED(sg_dma_len(sg), PAGE_SIZE));
page_sizes |= sg_dma_len(sg);
sg = __sg_next(sg);
}