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drm/exynos: stop copying sg table

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Already struct exynos_drm_gem_buf has pages of the buffer, so we don't
need to copy from sg table of the buffer to sg table of dma-buf
attachment, just can make sg table from pages of the buffer.

Signed-off-by: Joonyoung Shim <jy0922.shim@samsung.com>
Signed-off-by: Inki Dae <inki.dae@samsung.com>
This commit is contained in:
Joonyoung Shim 2015-07-28 17:53:20 +09:00 committed by Inki Dae
parent 0e9a2ee3bc
commit 67e93c808b
3 changed files with 20 additions and 40 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

55
drivers/gpu/drm/exynos/exynos_drm_dmabuf.c
View file

@ -18,7 +18,7 @@
#include <linux/dma-buf.h>
struct exynos_drm_dmabuf_attachment {
struct sg_table sgt;
struct sg_table *sgt;
enum dma_data_direction dir;
bool is_mapped;
};
@ -53,13 +53,15 @@ static void exynos_gem_detach_dma_buf(struct dma_buf *dmabuf,
if (!exynos_attach)
return;
sgt = &exynos_attach->sgt;
sgt = exynos_attach->sgt;
if (sgt) {
if (exynos_attach->dir != DMA_NONE)
dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents,
exynos_attach->dir);
sg_free_table(sgt);
}
if (exynos_attach->dir != DMA_NONE)
dma_unmap_sg(attach->dev, sgt->sgl, sgt->nents,
exynos_attach->dir);
sg_free_table(sgt);
kfree(sgt);
kfree(exynos_attach);
attach->priv = NULL;
}
@ -70,16 +72,13 @@ static struct sg_table *
{
struct exynos_drm_dmabuf_attachment *exynos_attach = attach->priv;
struct exynos_drm_gem_obj *gem_obj = dma_buf_to_obj(attach->dmabuf);
struct drm_device *dev = gem_obj->base.dev;
struct exynos_drm_gem_buf *buf;
struct scatterlist *rd, *wr;
struct sg_table *sgt = NULL;
unsigned int i;
int nents, ret;
struct sg_table *sgt;
int npages;
/* just return current sgt if already requested. */
if (exynos_attach->dir == dir && exynos_attach->is_mapped)
return &exynos_attach->sgt;
return exynos_attach->sgt;
buf = gem_obj->buffer;
if (!buf) {
@ -87,42 +86,29 @@ static struct sg_table *
return ERR_PTR(-ENOMEM);
}
sgt = &exynos_attach->sgt;
npages = buf->size >> PAGE_SHIFT;
ret = sg_alloc_table(sgt, buf->sgt->orig_nents, GFP_KERNEL);
if (ret) {
DRM_ERROR("failed to alloc sgt.\n");
return ERR_PTR(-ENOMEM);
}
mutex_lock(&dev->struct_mutex);
rd = buf->sgt->sgl;
wr = sgt->sgl;
for (i = 0; i < sgt->orig_nents; ++i) {
sg_set_page(wr, sg_page(rd), rd->length, rd->offset);
rd = sg_next(rd);
wr = sg_next(wr);
}
sgt = drm_prime_pages_to_sg(buf->pages, npages);
if (IS_ERR(sgt))
goto err;
if (dir != DMA_NONE) {
nents = dma_map_sg(attach->dev, sgt->sgl, sgt->orig_nents, dir);
if (!nents) {
if (!dma_map_sg(attach->dev, sgt->sgl, sgt->orig_nents, dir)) {
DRM_ERROR("failed to map sgl with iommu.\n");
sg_free_table(sgt);
sgt = ERR_PTR(-EIO);
goto err_unlock;
goto err;
}
}
exynos_attach->is_mapped = true;
exynos_attach->sgt = sgt;
exynos_attach->dir = dir;
attach->priv = exynos_attach;
DRM_DEBUG_PRIME("buffer size = 0x%lx\n", buf->size);
err_unlock:
mutex_unlock(&dev->struct_mutex);
err:
return sgt;
}
@ -280,7 +266,6 @@ struct drm_gem_object *exynos_dmabuf_prime_import(struct drm_device *drm_dev,
}
exynos_gem_obj->buffer = buffer;
buffer->sgt = sgt;
exynos_gem_obj->base.import_attach = attach;
DRM_DEBUG_PRIME("dma_addr = %pad, size = 0x%lx\n", &buffer->dma_addr,

3
drivers/gpu/drm/exynos/exynos_drm_gem.c
View file

@ -455,9 +455,6 @@ void exynos_drm_gem_free_object(struct drm_gem_object *obj)
exynos_gem_obj = to_exynos_gem_obj(obj);
buf = exynos_gem_obj->buffer;
if (obj->import_attach)
drm_prime_gem_destroy(obj, buf->sgt);
exynos_drm_gem_destroy(to_exynos_gem_obj(obj));
}

2
drivers/gpu/drm/exynos/exynos_drm_gem.h
View file

@ -30,7 +30,6 @@
* device address with IOMMU.
* @write: whether pages will be written to by the caller.
* @pages: Array of backing pages.
* @sgt: sg table to transfer page data.
* @size: size of allocated memory region.
* @pfnmap: indicate whether memory region from userptr is mmaped with
* VM_PFNMAP or not.
@ -43,7 +42,6 @@ struct exynos_drm_gem_buf {
struct dma_attrs dma_attrs;
unsigned int write;
struct page **pages;
struct sg_table *sgt;
unsigned long size;
bool pfnmap;
};