If we want a contiguous mapping of a single page sized object, we can
forgo using vmap() and just use a regular kmap().
(This maybe worth lifting to the core, with the additional proviso that
the pgprot_t is compatible.)
Signed-off-by: Chris Wilson <ch...@chris-wilson.co.uk>
---
drivers/gpu/drm/i915/i915_gem.c | 28 +++++++++++++++++++---------
1 file changed, 19 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index cca45f60d0bd..7be5a8fb9180 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1882,14 +1882,17 @@ i915_gem_object_put_pages(struct drm_i915_gem_object
*obj)
* lists early. */
list_del(&obj->global_list);
- ops->put_pages(obj);
- obj->pages = NULL;
-
if (obj->vmapping) {
- vunmap(obj->vmapping);
+ if (obj->base.size == PAGE_SIZE)
+ kunmap(sg_page(obj->pages->sgl));
+ else
+ vunmap(obj->vmapping);
obj->vmapping = NULL;
}
+ ops->put_pages(obj);
+ obj->pages = NULL;
+
i915_gem_object_invalidate(obj);
return 0;
@@ -2069,15 +2072,22 @@ void *i915_gem_object_pin_vmap(struct
drm_i915_gem_object *obj)
i915_gem_object_pin_pages(obj);
if (obj->vmapping == NULL) {
- struct sg_page_iter sg_iter;
struct page **pages;
- int n;
- n = obj->base.size >> PAGE_SHIFT;
- pages = drm_malloc_gfp(n, sizeof(*pages), GFP_TEMPORARY);
+ pages = NULL;
+ if (obj->base.size == PAGE_SIZE)
+ obj->vmapping = 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 = 0;
- for_each_sg_page(obj->pages->sgl, &sg_iter,
obj->pages->nents, 0)
+ for_each_sg_page(obj->pages->sgl, &sg_iter,
+ obj->pages->nents, 0)
pages[n++] = sg_page_iter_page(&sg_iter);
obj->vmapping = vmap(pages, n, 0, PAGE_KERNEL);
--
2.7.0.rc3
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