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path: root/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c
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Diffstat (limited to 'drivers/gpu/drm/exynos/exynos_drm_dmabuf.c')
-rw-r--r--drivers/gpu/drm/exynos/exynos_drm_dmabuf.c33
1 files changed, 25 insertions, 8 deletions
diff --git a/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c b/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c
index 274909271c36..613bf8a5d9b2 100644
--- a/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c
+++ b/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c
@@ -25,6 +25,7 @@
#include "drmP.h"
#include "drm.h"
+#include "exynos_drm.h"
#include "exynos_drm_drv.h"
#include "exynos_drm_gem.h"
@@ -86,6 +87,10 @@ static struct sg_table *
npages = buf->size / buf->page_size;
sgt = exynos_pages_to_sg(buf->pages, npages, buf->page_size);
+ if (!sgt) {
+ DRM_DEBUG_PRIME("exynos_pages_to_sg returned NULL!\n");
+ goto err_unlock;
+ }
nents = dma_map_sg(attach->dev, sgt->sgl, sgt->nents, dir);
DRM_DEBUG_PRIME("npages = %d buffer size = 0x%lx page_size = 0x%lx\n",
@@ -186,7 +191,7 @@ struct drm_gem_object *exynos_dmabuf_prime_import(struct drm_device *drm_dev,
struct exynos_drm_gem_obj *exynos_gem_obj;
struct exynos_drm_gem_buf *buffer;
struct page *page;
- int ret, i = 0;
+ int ret;
DRM_DEBUG_PRIME("%s\n", __FILE__);
@@ -210,7 +215,7 @@ struct drm_gem_object *exynos_dmabuf_prime_import(struct drm_device *drm_dev,
sgt = dma_buf_map_attachment(attach, DMA_BIDIRECTIONAL);
- if (IS_ERR(sgt)) {
+ if (IS_ERR_OR_NULL(sgt)) {
ret = PTR_ERR(sgt);
goto err_buf_detach;
}
@@ -236,13 +241,25 @@ struct drm_gem_object *exynos_dmabuf_prime_import(struct drm_device *drm_dev,
}
sgl = sgt->sgl;
- buffer->dma_addr = sg_dma_address(sgl);
- while (i < sgt->nents) {
- buffer->pages[i] = sg_page(sgl);
- buffer->size += sg_dma_len(sgl);
- sgl = sg_next(sgl);
- i++;
+ if (sgt->nents == 1) {
+ buffer->dma_addr = sg_dma_address(sgt->sgl);
+ buffer->size = sg_dma_len(sgt->sgl);
+
+ /* always physically continuous memory if sgt->nents is 1. */
+ exynos_gem_obj->flags |= EXYNOS_BO_CONTIG;
+ } else {
+ unsigned int i = 0;
+
+ buffer->dma_addr = sg_dma_address(sgl);
+ while (i < sgt->nents) {
+ buffer->pages[i] = sg_page(sgl);
+ buffer->size += sg_dma_len(sgl);
+ sgl = sg_next(sgl);
+ i++;
+ }
+
+ exynos_gem_obj->flags |= EXYNOS_BO_NONCONTIG;
}
exynos_gem_obj->buffer = buffer;
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