static void *vb2_dma_contig_get_userptr(void *alloc_ctx, unsigned long vaddr,
unsigned long size, int write)
{
struct vb2_dc_buf *buf;
struct vm_area_struct *vma;
dma_addr_t dma_addr = 0;
int ret;
buf = kzalloc(sizeof *buf, GFP_KERNEL);
if (!buf)
return ERR_PTR(-ENOMEM);
ret = vb2_get_contig_userptr(vaddr, size, &vma, &dma_addr);
if (ret) {
printk(KERN_ERR "Failed acquiring VMA for vaddr 0x%08lx\n",
vaddr);
kfree(buf);
return ERR_PTR(ret);
}
buf->size = size;
buf->dma_addr = dma_addr;
buf->vma = vma;
return buf;
}
static void *vb2_vmalloc_get_userptr(void *alloc_ctx, unsigned long vaddr,
unsigned long size, int write)
{
struct vb2_vmalloc_buf *buf;
unsigned long first, last;
int n_pages, offset;
struct vm_area_struct *vma;
dma_addr_t physp;
buf = kzalloc(sizeof(*buf), GFP_KERNEL);
if (!buf)
return NULL;
buf->write = write;
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;
} 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,
PAGE_KERNEL);
if (!buf->vaddr)
goto fail_get_user_pages;
}
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:
kfree(buf);
return NULL;
}
