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path: root/drivers/gpu/drm/drm_prime.c
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Diffstat (limited to 'drivers/gpu/drm/drm_prime.c')
-rw-r--r--drivers/gpu/drm/drm_prime.c48
1 files changed, 48 insertions, 0 deletions
diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index 1bdf2b5..f546ff9 100644
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -68,6 +68,7 @@ int drm_gem_prime_handle_to_fd(struct drm_device *dev,
{
struct drm_gem_object *obj;
void *buf;
+ int ret;
obj = drm_gem_object_lookup(dev, file_priv, handle);
if (!obj)
@@ -100,6 +101,17 @@ int drm_gem_prime_handle_to_fd(struct drm_device *dev,
obj->export_dma_buf = buf;
*prime_fd = dma_buf_fd(buf, flags);
}
+ /* if we've exported this buffer the cheat and add it to the import list
+ * so we get the correct handle back
+ */
+ ret = drm_prime_add_imported_buf_handle(&file_priv->prime,
+ obj->export_dma_buf, handle);
+ if (ret) {
+ drm_gem_object_unreference_unlocked(obj);
+ mutex_unlock(&file_priv->prime.lock);
+ return ret;
+ }
+
mutex_unlock(&file_priv->prime.lock);
return 0;
}
@@ -227,6 +239,42 @@ out:
}
EXPORT_SYMBOL(drm_prime_pages_to_sg);
+/* export an sg table into an array of pages and addresses
+ this is currently required by the TTM driver in order to do correct fault
+ handling */
+int drm_prime_sg_to_page_addr_arrays(struct sg_table *sgt, struct page **pages,
+ dma_addr_t *addrs, int max_pages)
+{
+ unsigned count;
+ struct scatterlist *sg;
+ struct page *page;
+ u32 len, offset;
+ int pg_index;
+ dma_addr_t addr;
+
+ pg_index = 0;
+ for_each_sg(sgt->sgl, sg, sgt->nents, count) {
+ len = sg->length;
+ offset = sg->offset;
+ page = sg_page(sg);
+ addr = sg_dma_address(sg);
+
+ while (len > 0) {
+ if (WARN_ON(pg_index >= max_pages))
+ return -1;
+ pages[pg_index] = page;
+ if (addrs)
+ addrs[pg_index] = addr;
+
+ page++;
+ addr += PAGE_SIZE;
+ len -= PAGE_SIZE;
+ pg_index++;
+ }
+ }
+ return 0;
+}
+EXPORT_SYMBOL(drm_prime_sg_to_page_addr_arrays);
/* helper function to cleanup a GEM/prime object */
void drm_prime_gem_destroy(struct drm_gem_object *obj, struct sg_table *sg)
{
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