Hi,
On 11/15/12, Prathyush K <prathyush.k@xxxxxxxxxxx> wrote:
> The 'pages' structure is not required since we can use the 'sgt'. Even for
> CONTIG buffers, a SGT is created (which will have just one sgl). This SGT
> can be used during mmap instead of 'pages'. The 'page_size' element of the
> structure is also not used anywhere and is removed.
> This patch also fixes a memory leak where the 'pages' structure was being
> allocated during gem buffer allocation but not being freed during
> deallocate.
>
> Signed-off-by: Prathyush K <prathyush.k@xxxxxxxxxxx>
> ---
> drivers/gpu/drm/exynos/exynos_drm_buf.c | 20 --------------
> drivers/gpu/drm/exynos/exynos_drm_buf.h | 4 +-
> drivers/gpu/drm/exynos/exynos_drm_dmabuf.c | 3 +-
> drivers/gpu/drm/exynos/exynos_drm_gem.c | 39
> +++++++++++----------------
> drivers/gpu/drm/exynos/exynos_drm_gem.h | 4 ---
> 5 files changed, 19 insertions(+), 51 deletions(-)
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_buf.c
> b/drivers/gpu/drm/exynos/exynos_drm_buf.c
> index 48c5896..72bf97b 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_buf.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_buf.c
> @@ -34,8 +34,6 @@ static int lowlevel_buffer_allocate(struct drm_device
> *dev,
> unsigned int flags, struct exynos_drm_gem_buf *buf)
> {
> int ret = 0;
> - unsigned int npages, i = 0;
> - struct scatterlist *sgl;
> enum dma_attr attr = DMA_ATTR_FORCE_CONTIGUOUS;
>
> DRM_DEBUG_KMS("%s\n", __FILE__);
> @@ -73,22 +71,6 @@ static int lowlevel_buffer_allocate(struct drm_device
> *dev,
> goto err_free_sgt;
> }
>
> - npages = buf->sgt->nents;
> -
> - buf->pages = kzalloc(sizeof(struct page) * npages, GFP_KERNEL);
> - if (!buf->pages) {
> - DRM_ERROR("failed to allocate pages.\n");
> - ret = -ENOMEM;
> - goto err_free_table;
> - }
> -
> - sgl = buf->sgt->sgl;
> - while (i < npages) {
> - buf->pages[i] = sg_page(sgl);
> - sgl = sg_next(sgl);
> - i++;
> - }
> -
> DRM_DEBUG_KMS("vaddr(0x%lx), dma_addr(0x%lx), size(0x%lx)\n",
> (unsigned long)buf->kvaddr,
> (unsigned long)buf->dma_addr,
> @@ -96,8 +78,6 @@ static int lowlevel_buffer_allocate(struct drm_device
> *dev,
>
> return ret;
>
> -err_free_table:
> - sg_free_table(buf->sgt);
> err_free_sgt:
> kfree(buf->sgt);
> buf->sgt = NULL;
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_buf.h
> b/drivers/gpu/drm/exynos/exynos_drm_buf.h
> index 3388e4e..25cf162 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_buf.h
> +++ b/drivers/gpu/drm/exynos/exynos_drm_buf.h
> @@ -34,12 +34,12 @@ struct exynos_drm_gem_buf *exynos_drm_init_buf(struct
> drm_device *dev,
> void exynos_drm_fini_buf(struct drm_device *dev,
> struct exynos_drm_gem_buf *buffer);
>
> -/* allocate physical memory region and setup sgt and pages. */
> +/* allocate physical memory region and setup sgt. */
> int exynos_drm_alloc_buf(struct drm_device *dev,
> struct exynos_drm_gem_buf *buf,
> unsigned int flags);
>
> -/* release physical memory region, sgt and pages. */
> +/* release physical memory region, and sgt. */
> void exynos_drm_free_buf(struct drm_device *dev,
> unsigned int flags,
> struct exynos_drm_gem_buf *buffer);
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c
> b/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c
> index b98da30..615a049 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_dmabuf.c
> @@ -93,8 +93,7 @@ static struct sg_table *
> goto err_unlock;
> }
>
> - DRM_DEBUG_PRIME("buffer size = 0x%lx page_size = 0x%lx\n",
> - buf->size, buf->page_size);
> + DRM_DEBUG_PRIME("buffer size = 0x%lx\n", buf->size);
>
> err_unlock:
> mutex_unlock(&dev->struct_mutex);
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.c
> b/drivers/gpu/drm/exynos/exynos_drm_gem.c
> index 50d73f1..40999ac 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_gem.c
> +++ b/drivers/gpu/drm/exynos/exynos_drm_gem.c
> @@ -99,34 +99,27 @@ static int exynos_drm_gem_map_buf(struct drm_gem_object
> *obj,
> unsigned long pfn;
> int i;
>
> - if (exynos_gem_obj->flags & EXYNOS_BO_NONCONTIG) {
> - if (!buf->sgt)
> - return -EINTR;
> -
> - sgl = buf->sgt->sgl;
> - for_each_sg(buf->sgt->sgl, sgl, buf->sgt->nents, i) {
> - if (!sgl) {
> - DRM_ERROR("invalid SG table\n");
> - return -EINTR;
> - }
> - if (page_offset < (sgl->length >> PAGE_SHIFT))
> - break;
> - page_offset -= (sgl->length >> PAGE_SHIFT);
> - }
> -
> - if (i >= buf->sgt->nents) {
> - DRM_ERROR("invalid page offset\n");
> - return -EINVAL;
> - }
> + if (!buf->sgt)
> + return -EINTR;
>
> - pfn = __phys_to_pfn(sg_phys(sgl)) + page_offset;
> - } else {
> - if (!buf->pages)
> + sgl = buf->sgt->sgl;
> + for_each_sg(buf->sgt->sgl, sgl, buf->sgt->nents, i) {
> + if (!sgl) {
It's never happned by for_each_sg definition.
> + DRM_ERROR("invalid SG table\n");
> return -EINTR;
> + }
> + if (page_offset < (sgl->length >> PAGE_SHIFT))
> + break;
> + page_offset -= (sgl->length >> PAGE_SHIFT);
> + }
>
> - pfn = page_to_pfn(buf->pages[0]) + page_offset;
> + if (i >= buf->sgt->nents) {
ditto. IOW it's dead code.
Thank you,
Kyungmin Park
> + DRM_ERROR("invalid page offset\n");
> + return -EINVAL;
> }
>
> + pfn = __phys_to_pfn(sg_phys(sgl)) + page_offset;
> +
> return vm_insert_mixed(vma, f_vaddr, pfn);
> }
>
> diff --git a/drivers/gpu/drm/exynos/exynos_drm_gem.h
> b/drivers/gpu/drm/exynos/exynos_drm_gem.h
> index 83d21ef..3600b3b 100644
> --- a/drivers/gpu/drm/exynos/exynos_drm_gem.h
> +++ b/drivers/gpu/drm/exynos/exynos_drm_gem.h
> @@ -39,8 +39,6 @@
> * - this address could be physical address without IOMMU and
> * device address with IOMMU.
> * @sgt: sg table to transfer page data.
> - * @pages: contain all pages to allocated memory region.
> - * @page_size: could be 4K, 64K or 1MB.
> * @size: size of allocated memory region.
> */
> struct exynos_drm_gem_buf {
> @@ -48,8 +46,6 @@ struct exynos_drm_gem_buf {
> dma_addr_t dma_addr;
> struct dma_attrs dma_attrs;
> struct sg_table *sgt;
> - struct page **pages;
> - unsigned long page_size;
> unsigned long size;
> };
>
> --
> 1.7.0.4
>
> _______________________________________________
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> dri-devel@xxxxxxxxxxxxxxxxxxxxx
> http://lists.freedesktop.org/mailman/listinfo/dri-devel
>
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