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video: deferred io with physically contiguous memory 

Extend the deferred io code from only supporting vmalloc()ed frame
buffer memory to support both vmalloc()ed and physically contiguous
frame buffer memory.

The sh_mobile_lcdcfb hardware does not support scatter gather so
we need physically contiguous memory to back our frame buffer.

Signed-off-by: Magnus Damm <damm@igel.co.jp>
Acked-by: Jaya Kumar <jayakumar.lkml@gmail.com>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Magnus Damm 2008-12-19 15:34:32 +09:00 committed by Paul Mundt
parent 6e1038a95b
commit 37b4837959
1 changed files with 15 additions and 5 deletions
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20
drivers/video/fb_defio.c
View File

@ -24,6 +24,19 @@
#include <linux/rmap.h>
#include <linux/pagemap.h>
struct page *fb_deferred_io_page(struct fb_info *info, unsigned long offs)
{
void *screen_base = (void __force *) info->screen_base;
struct page *page;
if (is_vmalloc_addr(screen_base + offs))
page = vmalloc_to_page(screen_base + offs);
else
page = pfn_to_page((info->fix.smem_start + offs) >> PAGE_SHIFT);
return page;
}
/* this is to find and return the vmalloc-ed fb pages */
static int fb_deferred_io_fault(struct vm_area_struct *vma,
struct vm_fault *vmf)
@ -31,14 +44,12 @@ static int fb_deferred_io_fault(struct vm_area_struct *vma,
unsigned long offset;
struct page *page;
struct fb_info *info = vma->vm_private_data;
/* info->screen_base is virtual memory */
void *screen_base = (void __force *) info->screen_base;
offset = vmf->pgoff << PAGE_SHIFT;
if (offset >= info->fix.smem_len)
return VM_FAULT_SIGBUS;
page = vmalloc_to_page(screen_base + offset);
page = fb_deferred_io_page(info, offset);
if (!page)
return VM_FAULT_SIGBUS;
@ -188,7 +199,6 @@ EXPORT_SYMBOL_GPL(fb_deferred_io_open);
void fb_deferred_io_cleanup(struct fb_info *info)
{
void *screen_base = (void __force *) info->screen_base;
struct fb_deferred_io *fbdefio = info->fbdefio;
struct page *page;
int i;
@ -199,7 +209,7 @@ void fb_deferred_io_cleanup(struct fb_info *info)
/* clear out the mapping that we setup */
for (i = 0 ; i < info->fix.smem_len; i += PAGE_SIZE) {
page = vmalloc_to_page(screen_base + i);
page = fb_deferred_io_page(info, i);
page->mapping = NULL;
}