drm: modify pages_to_sg prime helper to create optimized SG table

It fixes the issue arises due to passing 'nr_pages' in place of 'nents' to
sg_alloc_table. When ARM_HAS_SG_CHAIN is disabled, it is causing failure in
creating SG table for the buffers having more than 204 physical pages i.e.
equal to SG_MAX_SINGLE_ALLOC.

When using sg_alloc_table_from_pages interface, in place of sg_alloc_table,
page list will be passes to get each contiguous section which is represented
by a single entry in the table. For a Contiguous Buffer, number of entries
should be equal to 1.

Following check is causing the failure which is not applicable for Non-Contig
buffers:

	if (WARN_ON_ONCE(nents > max_ents))
		return -EINVAL;

Above patch is well tested for EXYNOS4 and EXYNOS5 for with/wihtout IOMMU
supprot. NOUVEAU and RADEON platforms also depends on drm_prime_pages_to_sg
helper function.

This set is base on "exynos-drm-fixes" branch at
http://git.kernel.org/?p=linux/kernel/git/daeinki/drm-exynos.git

Signed-off-by: Rahul Sharma <rahul.sharma@samsung.com>
Acked-by: Dave Airlie <airlied@gmail.com>
Reviewed-by: Aaron Plattner <aplattner@nvidia.com>
Tested-by: Aaron Plattner <aplattner@nvidia.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>

1 files changed, 2 insertions, 6 deletions

diff --git a/drivers/gpu/drm/drm_prime.c b/drivers/gpu/drm/drm_prime.c
index 366910ddcfcb..25d02187067e 100644
--- a/drivers/gpu/drm/drm_prime.c
+++ b/drivers/gpu/drm/drm_prime.c
@@ -401,21 +401,17 @@ int drm_prime_fd_to_handle_ioctl(struct drm_device *dev, void *data,
 struct sg_table *drm_prime_pages_to_sg(struct page **pages, int nr_pages)
 {
         struct sg_table *sg = NULL;
-        struct scatterlist *iter;
-        int i;
         int ret;
 
         sg = kmalloc(sizeof(struct sg_table), GFP_KERNEL);
         if (!sg)
                 goto out;
 
-        ret = sg_alloc_table(sg, nr_pages, GFP_KERNEL);
+        ret = sg_alloc_table_from_pages(sg, pages, nr_pages, 0,
+                                nr_pages << PAGE_SHIFT, GFP_KERNEL);
         if (ret)
                 goto out;
 
-        for_each_sg(sg->sgl, iter, nr_pages, i)
-                sg_set_page(iter, pages[i], PAGE_SIZE, 0);
-
         return sg;
 out:
         kfree(sg);