Convert vb2_vmalloc_get_userptr() to use passed vector of pfns. When we
are doing that there's no need to allocate page array and some code can
be simplified.
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
drivers/media/v4l2-core/videobuf2-vmalloc.c | 86 +++++++++++------------------
1 file changed, 33 insertions(+), 53 deletions(-)
diff --git a/drivers/media/v4l2-core/videobuf2-vmalloc.c b/drivers/media/v4l2-core/videobuf2-vmalloc.c
index ab38e054d1a0..3b4e53bd97d7 100644
--- a/drivers/media/v4l2-core/videobuf2-vmalloc.c
+++ b/drivers/media/v4l2-core/videobuf2-vmalloc.c
@@ -23,11 +23,9 @@
struct vb2_vmalloc_buf {
void *vaddr;
- struct page **pages;
- struct vm_area_struct *vma;
+ struct pinned_pfns *pfns;
int write;
unsigned long size;
- unsigned int n_pages;
atomic_t refcount;
struct vb2_vmarea_handler handler;
struct dma_buf *dbuf;
@@ -74,10 +72,8 @@ static void *vb2_vmalloc_get_userptr(void *alloc_ctx, struct pinned_pfns **ppfn,
int write)
{
struct vb2_vmalloc_buf *buf;
- unsigned long first, last;
- int n_pages, offset;
- struct vm_area_struct *vma;
- dma_addr_t physp;
+ struct pinned_pfns *pfns = *ppfn;
+ int n_pages, offset, i;
buf = kzalloc(sizeof(*buf), GFP_KERNEL);
if (!buf)
@@ -87,49 +83,32 @@ static void *vb2_vmalloc_get_userptr(void *alloc_ctx, struct pinned_pfns **ppfn,
offset = vaddr & ~PAGE_MASK;
buf->size = size;
-
- vma = find_vma(current->mm, vaddr);
- if (vma && (vma->vm_flags & VM_PFNMAP) && (vma->vm_pgoff)) {
- if (vb2_get_contig_userptr(vaddr, size, &vma, &physp))
- goto fail_pages_array_alloc;
- buf->vma = vma;
- buf->vaddr = ioremap_nocache(physp, size);
- if (!buf->vaddr)
- goto fail_pages_array_alloc;
+ n_pages = pfns_vector_count(pfns);
+ if (pfns_vector_to_pages(pfns) < 0) {
+ unsigned long *nums = pfns_vector_pfns(pfns);
+
+ /*
+ * We cannot get page pointers for these pfns. Check memory is
+ * physically contiguous and use direct mapping.
+ */
+ for (i = 1; i < n_pages; i++)
+ if (nums[i-1] + 1 != nums[i])
+ goto out_buf;
+ buf->vaddr = ioremap_nocache(nums[0] << PAGE_SHIFT, size);
} else {
- first = vaddr >> PAGE_SHIFT;
- last = (vaddr + size - 1) >> PAGE_SHIFT;
- buf->n_pages = last - first + 1;
- buf->pages = kzalloc(buf->n_pages * sizeof(struct page *),
- GFP_KERNEL);
- if (!buf->pages)
- goto fail_pages_array_alloc;
-
- /* current->mm->mmap_sem is taken by videobuf2 core */
- n_pages = get_user_pages(current, current->mm,
- vaddr & PAGE_MASK, buf->n_pages,
- write, 1, /* force */
- buf->pages, NULL);
- if (n_pages != buf->n_pages)
- goto fail_get_user_pages;
-
- buf->vaddr = vm_map_ram(buf->pages, buf->n_pages, -1,
+ buf->vaddr = vm_map_ram(pfns_vector_pages(pfns), n_pages, -1,
PAGE_KERNEL);
- if (!buf->vaddr)
- goto fail_get_user_pages;
}
+ if (!buf->vaddr)
+ goto out_buf;
+ buf->pfns = pfns;
+ /* Clear the pointer so that the vector isn't freed by the caller */
+ *ppfn = NULL;
buf->vaddr += offset;
return buf;
-fail_get_user_pages:
- pr_debug("get_user_pages requested/got: %d/%d]\n", n_pages,
- buf->n_pages);
- while (--n_pages >= 0)
- put_page(buf->pages[n_pages]);
- kfree(buf->pages);
-
-fail_pages_array_alloc:
+out_buf:
kfree(buf);
return NULL;
@@ -140,21 +119,22 @@ static void vb2_vmalloc_put_userptr(void *buf_priv)
struct vb2_vmalloc_buf *buf = buf_priv;
unsigned long vaddr = (unsigned long)buf->vaddr & PAGE_MASK;
unsigned int i;
+ struct page **pages;
+ unsigned int n_pages;
- if (buf->pages) {
+ if (buf->pfns->is_pages) {
+ n_pages = pfns_vector_count(buf->pfns);
+ pages = pfns_vector_pages(buf->pfns);
if (vaddr)
- vm_unmap_ram((void *)vaddr, buf->n_pages);
- for (i = 0; i < buf->n_pages; ++i) {
- if (buf->write)
- set_page_dirty_lock(buf->pages[i]);
- put_page(buf->pages[i]);
- }
- kfree(buf->pages);
+ vm_unmap_ram((void *)vaddr, n_pages);
+ if (buf->write)
+ for (i = 0; i < n_pages; i++)
+ set_page_dirty_lock(pages[i]);
} else {
- if (buf->vma)
- vb2_put_vma(buf->vma);
iounmap(buf->vaddr);
}
+ put_vaddr_pfns(buf->pfns);
+ pfns_vector_destroy(buf->pfns);
kfree(buf);
}
--
1.8.1.4
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