summaryrefslogtreecommitdiffstats
diff options
context:
space:
mode:
-rw-r--r--drivers/gpu/drm/i915/i915_gem.c58
1 files changed, 35 insertions, 23 deletions
diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index afb6862b42e0..f504c3168da5 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2398,6 +2398,38 @@ i915_gem_object_get_pages(struct drm_i915_gem_object *obj)
return 0;
}
+/* The 'mapping' part of i915_gem_object_pin_map() below */
+static void *i915_gem_object_map(const struct drm_i915_gem_object *obj)
+{
+ unsigned long n_pages = obj->base.size >> PAGE_SHIFT;
+ struct sg_table *sgt = obj->pages;
+ struct sg_page_iter sg_iter;
+ struct page **pages;
+ unsigned long i = 0;
+ void *addr;
+
+ /* A single page can always be kmapped */
+ if (n_pages == 1)
+ return kmap(sg_page(sgt->sgl));
+
+ pages = drm_malloc_gfp(n_pages, sizeof(*pages), GFP_TEMPORARY);
+ if (!pages)
+ return NULL;
+
+ for_each_sg_page(sgt->sgl, &sg_iter, sgt->nents, 0)
+ pages[i++] = sg_page_iter_page(&sg_iter);
+
+ /* Check that we have the expected number of pages */
+ GEM_BUG_ON(i != n_pages);
+
+ addr = vmap(pages, n_pages, 0, PAGE_KERNEL);
+
+ drm_free_large(pages);
+
+ return addr;
+}
+
+/* get, pin, and map the pages of the object into kernel space */
void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj)
{
int ret;
@@ -2410,29 +2442,9 @@ void *i915_gem_object_pin_map(struct drm_i915_gem_object *obj)
i915_gem_object_pin_pages(obj);
- if (obj->mapping == NULL) {
- 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 = 0;
- for_each_sg_page(obj->pages->sgl, &sg_iter,
- obj->pages->nents, 0)
- pages[n++] = sg_page_iter_page(&sg_iter);
-
- obj->mapping = vmap(pages, n, 0, PAGE_KERNEL);
- drm_free_large(pages);
- }
- if (obj->mapping == NULL) {
+ if (!obj->mapping) {
+ obj->mapping = i915_gem_object_map(obj);
+ if (!obj->mapping) {
i915_gem_object_unpin_pages(obj);
return ERR_PTR(-ENOMEM);
}
OpenPOWER on IntegriCloud