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drm/i915: Avoid allocating a vmap arena for a single page 

If we want a contiguous mapping of a single page sized object, we can
forgo using vmap() and just use a regular kmap(). Note that this is only
suitable if the desired pgprot_t is compatible.

v2: Use is_vmalloc_addr()

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Cc: Dave Gordon <david.s.gordon@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1460113874-17366-7-git-send-email-chris@chris-wilson.co.uk
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
This commit is contained in:
Chris Wilson 2016-04-08 12:11:14 +01:00
parent f2a85e1975
commit fb8621d3be
1 changed files with 14 additions and 5 deletions
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17
drivers/gpu/drm/i915/i915_gem.c
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@ -2233,7 +2233,10 @@ i915_gem_object_put_pages(struct drm_i915_gem_object *obj)
list_del(&obj->global_list);
if (obj->mapping) {
if (is_vmalloc_addr(obj->mapping))
vunmap(obj->mapping);
else
kunmap(kmap_to_page(obj->mapping));
obj->mapping = NULL;
}
@ -2418,13 +2421,19 @@ void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj)
i915_gem_object_pin_pages(obj);
if (obj->mapping == NULL) {
struct sg_page_iter sg_iter;
struct page **pages;
pages = NULL;
if (obj->base.size == PAGE_SIZE)
obj->mapping = kmap(sg_page(obj->pages->sgl));
else
pages = drm_malloc_gfp(obj->base.size >> PAGE_SHIFT,
sizeof(*pages),
GFP_TEMPORARY);
if (pages != NULL) {
struct sg_page_iter sg_iter;
int n;
n = obj->base.size >> PAGE_SHIFT;
pages = drm_malloc_gfp(n, sizeof(*pages), GFP_TEMPORARY);
if (pages != NULL) {
n = 0;
for_each_sg_page(obj->pages->sgl, &sg_iter,
obj->pages->nents, 0)