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authorMagnus Damm <damm@igel.co.jp>2008-12-19 15:34:32 +0900
committerPaul Mundt <lethal@linux-sh.org>2008-12-22 18:44:48 +0900
commit37b4837959cb9aa60686ca0d85f73d819251abad (patch)
treed3e12e54e21c6e2a7c62cc1a2f5a074fd09dac33 /drivers/video
parent6e1038a95bebb8a1ad6066c95aa9c3af6963c9ff (diff)
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>
Diffstat (limited to 'drivers/video')
-rw-r--r--drivers/video/fb_defio.c20
1 files changed, 15 insertions, 5 deletions
diff --git a/drivers/video/fb_defio.c b/drivers/video/fb_defio.c
index 06060ccd3c2..082026546ae 100644
--- a/drivers/video/fb_defio.c
+++ b/drivers/video/fb_defio.c
@@ -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;
}