mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-12-15 23:14:31 +08:00
[media] drm/exynos: Convert g2d_userptr_get_dma_addr() to use get_vaddr_frames()
Convert g2d_userptr_get_dma_addr() to pin pages using get_vaddr_frames(). This removes the knowledge about vmas and mmap_sem locking from exynos driver. Also it fixes a problem that the function has been mapping user provided address without holding mmap_sem. Acked-by: Inki Dae <inki.dae@samsung.com> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@osg.samsung.com>
This commit is contained in:
Jan Kara
Mauro Carvalho Chehab
parent
6690c8c78c
commit
63540f0191
@ -77,6 +77,7 @@ config DRM_EXYNOS_VIDI
|
||||
config DRM_EXYNOS_G2D
|
||||
bool "Exynos DRM G2D"
|
||||
depends on DRM_EXYNOS && !VIDEO_SAMSUNG_S5P_G2D
|
||||
select FRAME_VECTOR
|
||||
help
|
||||
Choose this option if you want to use Exynos G2D for DRM.
|
||||
|
||||
|
||||
@ -190,10 +190,8 @@ struct g2d_cmdlist_userptr {
|
||||
dma_addr_t dma_addr;
|
||||
unsigned long userptr;
|
||||
unsigned long size;
|
||||
struct page **pages;
|
||||
unsigned int npages;
|
||||
struct frame_vector *vec;
|
||||
struct sg_table *sgt;
|
||||
struct vm_area_struct *vma;
|
||||
atomic_t refcount;
|
||||
bool in_pool;
|
||||
bool out_of_list;
|
||||
@ -363,6 +361,7 @@ static void g2d_userptr_put_dma_addr(struct drm_device *drm_dev,
|
||||
{
|
||||
struct g2d_cmdlist_userptr *g2d_userptr =
|
||||
(struct g2d_cmdlist_userptr *)obj;
|
||||
struct page **pages;
|
||||
|
||||
if (!obj)
|
||||
return;
|
||||
@ -382,19 +381,21 @@ out:
|
||||
exynos_gem_unmap_sgt_from_dma(drm_dev, g2d_userptr->sgt,
|
||||
DMA_BIDIRECTIONAL);
|
||||
|
||||
exynos_gem_put_pages_to_userptr(g2d_userptr->pages,
|
||||
g2d_userptr->npages,
|
||||
g2d_userptr->vma);
|
||||
pages = frame_vector_pages(g2d_userptr->vec);
|
||||
if (!IS_ERR(pages)) {
|
||||
int i;
|
||||
|
||||
exynos_gem_put_vma(g2d_userptr->vma);
|
||||
for (i = 0; i < frame_vector_count(g2d_userptr->vec); i++)
|
||||
set_page_dirty_lock(pages[i]);
|
||||
}
|
||||
put_vaddr_frames(g2d_userptr->vec);
|
||||
frame_vector_destroy(g2d_userptr->vec);
|
||||
|
||||
if (!g2d_userptr->out_of_list)
|
||||
list_del_init(&g2d_userptr->list);
|
||||
|
||||
sg_free_table(g2d_userptr->sgt);
|
||||
kfree(g2d_userptr->sgt);
|
||||
|
||||
drm_free_large(g2d_userptr->pages);
|
||||
kfree(g2d_userptr);
|
||||
}
|
||||
|
||||
@ -408,9 +409,7 @@ static dma_addr_t *g2d_userptr_get_dma_addr(struct drm_device *drm_dev,
|
||||
struct exynos_drm_g2d_private *g2d_priv = file_priv->g2d_priv;
|
||||
struct g2d_cmdlist_userptr *g2d_userptr;
|
||||
struct g2d_data *g2d;
|
||||
struct page **pages;
|
||||
struct sg_table *sgt;
|
||||
struct vm_area_struct *vma;
|
||||
unsigned long start, end;
|
||||
unsigned int npages, offset;
|
||||
int ret;
|
||||
@ -456,65 +455,40 @@ static dma_addr_t *g2d_userptr_get_dma_addr(struct drm_device *drm_dev,
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
atomic_set(&g2d_userptr->refcount, 1);
|
||||
g2d_userptr->size = size;
|
||||
|
||||
start = userptr & PAGE_MASK;
|
||||
offset = userptr & ~PAGE_MASK;
|
||||
end = PAGE_ALIGN(userptr + size);
|
||||
npages = (end - start) >> PAGE_SHIFT;
|
||||
g2d_userptr->npages = npages;
|
||||
|
||||
pages = drm_calloc_large(npages, sizeof(struct page *));
|
||||
if (!pages) {
|
||||
DRM_ERROR("failed to allocate pages.\n");
|
||||
g2d_userptr->vec = frame_vector_create(npages);
|
||||
if (!g2d_userptr->vec) {
|
||||
ret = -ENOMEM;
|
||||
goto err_free;
|
||||
}
|
||||
|
||||
down_read(¤t->mm->mmap_sem);
|
||||
vma = find_vma(current->mm, userptr);
|
||||
if (!vma) {
|
||||
up_read(¤t->mm->mmap_sem);
|
||||
DRM_ERROR("failed to get vm region.\n");
|
||||
ret = -EFAULT;
|
||||
goto err_free_pages;
|
||||
}
|
||||
|
||||
if (vma->vm_end < userptr + size) {
|
||||
up_read(¤t->mm->mmap_sem);
|
||||
DRM_ERROR("vma is too small.\n");
|
||||
ret = -EFAULT;
|
||||
goto err_free_pages;
|
||||
}
|
||||
|
||||
g2d_userptr->vma = exynos_gem_get_vma(vma);
|
||||
if (!g2d_userptr->vma) {
|
||||
up_read(¤t->mm->mmap_sem);
|
||||
DRM_ERROR("failed to copy vma.\n");
|
||||
ret = -ENOMEM;
|
||||
goto err_free_pages;
|
||||
}
|
||||
|
||||
g2d_userptr->size = size;
|
||||
|
||||
ret = exynos_gem_get_pages_from_userptr(start & PAGE_MASK,
|
||||
npages, pages, vma);
|
||||
if (ret < 0) {
|
||||
up_read(¤t->mm->mmap_sem);
|
||||
ret = get_vaddr_frames(start, npages, true, true, g2d_userptr->vec);
|
||||
if (ret != npages) {
|
||||
DRM_ERROR("failed to get user pages from userptr.\n");
|
||||
goto err_put_vma;
|
||||
if (ret < 0)
|
||||
goto err_destroy_framevec;
|
||||
ret = -EFAULT;
|
||||
goto err_put_framevec;
|
||||
}
|
||||
if (frame_vector_to_pages(g2d_userptr->vec) < 0) {
|
||||
ret = -EFAULT;
|
||||
goto err_put_framevec;
|
||||
}
|
||||
|
||||
up_read(¤t->mm->mmap_sem);
|
||||
g2d_userptr->pages = pages;
|
||||
|
||||
sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
|
||||
if (!sgt) {
|
||||
ret = -ENOMEM;
|
||||
goto err_free_userptr;
|
||||
goto err_put_framevec;
|
||||
}
|
||||
|
||||
ret = sg_alloc_table_from_pages(sgt, pages, npages, offset,
|
||||
size, GFP_KERNEL);
|
||||
ret = sg_alloc_table_from_pages(sgt,
|
||||
frame_vector_pages(g2d_userptr->vec),
|
||||
npages, offset, size, GFP_KERNEL);
|
||||
if (ret < 0) {
|
||||
DRM_ERROR("failed to get sgt from pages.\n");
|
||||
goto err_free_sgt;
|
||||
@ -549,16 +523,11 @@ err_sg_free_table:
|
||||
err_free_sgt:
|
||||
kfree(sgt);
|
||||
|
||||
err_free_userptr:
|
||||
exynos_gem_put_pages_to_userptr(g2d_userptr->pages,
|
||||
g2d_userptr->npages,
|
||||
g2d_userptr->vma);
|
||||
err_put_framevec:
|
||||
put_vaddr_frames(g2d_userptr->vec);
|
||||
|
||||
err_put_vma:
|
||||
exynos_gem_put_vma(g2d_userptr->vma);
|
||||
|
||||
err_free_pages:
|
||||
drm_free_large(pages);
|
||||
err_destroy_framevec:
|
||||
frame_vector_destroy(g2d_userptr->vec);
|
||||
|
||||
err_free:
|
||||
kfree(g2d_userptr);
|
||||
|
||||
@ -378,103 +378,6 @@ int exynos_drm_gem_get_ioctl(struct drm_device *dev, void *data,
|
||||
return 0;
|
||||
}
|
||||
|
||||
struct vm_area_struct *exynos_gem_get_vma(struct vm_area_struct *vma)
|
||||
{
|
||||
struct vm_area_struct *vma_copy;
|
||||
|
||||
vma_copy = kmalloc(sizeof(*vma_copy), GFP_KERNEL);
|
||||
if (!vma_copy)
|
||||
return NULL;
|
||||
|
||||
if (vma->vm_ops && vma->vm_ops->open)
|
||||
vma->vm_ops->open(vma);
|
||||
|
||||
if (vma->vm_file)
|
||||
get_file(vma->vm_file);
|
||||
|
||||
memcpy(vma_copy, vma, sizeof(*vma));
|
||||
|
||||
vma_copy->vm_mm = NULL;
|
||||
vma_copy->vm_next = NULL;
|
||||
vma_copy->vm_prev = NULL;
|
||||
|
||||
return vma_copy;
|
||||
}
|
||||
|
||||
void exynos_gem_put_vma(struct vm_area_struct *vma)
|
||||
{
|
||||
if (!vma)
|
||||
return;
|
||||
|
||||
if (vma->vm_ops && vma->vm_ops->close)
|
||||
vma->vm_ops->close(vma);
|
||||
|
||||
if (vma->vm_file)
|
||||
fput(vma->vm_file);
|
||||
|
||||
kfree(vma);
|
||||
}
|
||||
|
||||
int exynos_gem_get_pages_from_userptr(unsigned long start,
|
||||
unsigned int npages,
|
||||
struct page **pages,
|
||||
struct vm_area_struct *vma)
|
||||
{
|
||||
int get_npages;
|
||||
|
||||
/* the memory region mmaped with VM_PFNMAP. */
|
||||
if (vma_is_io(vma)) {
|
||||
unsigned int i;
|
||||
|
||||
for (i = 0; i < npages; ++i, start += PAGE_SIZE) {
|
||||
unsigned long pfn;
|
||||
int ret = follow_pfn(vma, start, &pfn);
|
||||
if (ret)
|
||||
return ret;
|
||||
|
||||
pages[i] = pfn_to_page(pfn);
|
||||
}
|
||||
|
||||
if (i != npages) {
|
||||
DRM_ERROR("failed to get user_pages.\n");
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
get_npages = get_user_pages(current, current->mm, start,
|
||||
npages, 1, 1, pages, NULL);
|
||||
get_npages = max(get_npages, 0);
|
||||
if (get_npages != npages) {
|
||||
DRM_ERROR("failed to get user_pages.\n");
|
||||
while (get_npages)
|
||||
put_page(pages[--get_npages]);
|
||||
return -EFAULT;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
void exynos_gem_put_pages_to_userptr(struct page **pages,
|
||||
unsigned int npages,
|
||||
struct vm_area_struct *vma)
|
||||
{
|
||||
if (!vma_is_io(vma)) {
|
||||
unsigned int i;
|
||||
|
||||
for (i = 0; i < npages; i++) {
|
||||
set_page_dirty_lock(pages[i]);
|
||||
|
||||
/*
|
||||
* undo the reference we took when populating
|
||||
* the table.
|
||||
*/
|
||||
put_page(pages[i]);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
int exynos_gem_map_sgt_with_dma(struct drm_device *drm_dev,
|
||||
struct sg_table *sgt,
|
||||
enum dma_data_direction dir)
|
||||
|
||||
Loading…
Reference in New Issue
Block a user