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| author | Magnus Damm <damm@igel.co.jp> | 2008-12-19 15:34:32 +0900 |
|---|---|---|
| committer | Paul Mundt <lethal@linux-sh.org> | 2008-12-22 18:44:48 +0900 |
| commit | 37b4837959cb9aa60686ca0d85f73d819251abad (patch) | |
| tree | d3e12e54e21c6e2a7c62cc1a2f5a074fd09dac33 /drivers/video | |
| parent | 6e1038a95bebb8a1ad6066c95aa9c3af6963c9ff (diff) | |
| download | linux-rpi3-37b4837959cb9aa60686ca0d85f73d819251abad.tar.gz linux-rpi3-37b4837959cb9aa60686ca0d85f73d819251abad.tar.bz2 linux-rpi3-37b4837959cb9aa60686ca0d85f73d819251abad.zip | |
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.c | 20 |
1 files changed, 15 insertions, 5 deletions
diff --git a/drivers/video/fb_defio.c b/drivers/video/fb_defio.c index 06060ccd3c23..082026546aee 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; } |