Messages in this thread Patch in this message | | | From | Konrad Rzeszutek Wilk <> | Subject | [PATCH 1/3] fb-defio: If FBINFO_VIRTFB is defined, do not set VM_IO flag. | Date | Thu, 3 Dec 2009 10:31:56 -0500 |
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Most users (except sh_mobile_lcdcfb.c) get their framebuffer from vmalloc. Setting VM_IO is not necessary as the memory obtained from vmalloc is System RAM type and is not susceptible to PCI memory constraints. --- drivers/video/fb_defio.c | 4 +++- include/linux/fb.h | 1 + 2 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/drivers/video/fb_defio.c b/drivers/video/fb_defio.c index c27ab1e..94414fc 100644 --- a/drivers/video/fb_defio.c +++ b/drivers/video/fb_defio.c @@ -144,7 +144,9 @@ static const struct address_space_operations fb_deferred_io_aops = { static int fb_deferred_io_mmap(struct fb_info *info, struct vm_area_struct *vma) { vma->vm_ops = &fb_deferred_io_vm_ops; - vma->vm_flags |= ( VM_IO | VM_RESERVED | VM_DONTEXPAND ); + vma->vm_flags |= ( VM_RESERVED | VM_DONTEXPAND ); + if (!(info->flags & FBINFO_VIRTFB)) + vma->vm_flags |= VM_IO; vma->vm_private_data = info; return 0; } diff --git a/include/linux/fb.h b/include/linux/fb.h index de9c722..369767b 100644 --- a/include/linux/fb.h +++ b/include/linux/fb.h @@ -763,6 +763,7 @@ struct fb_tile_ops { * takes over; acceleration engine should be in a quiescent state */ /* hints */ +#define FBINFO_VIRTFB 0x0004 /* FB is System RAM, not device. */ #define FBINFO_PARTIAL_PAN_OK 0x0040 /* otw use pan only for double-buffering */ #define FBINFO_READS_FAST 0x0080 /* soft-copy faster than rendering */ -- 1.6.2.5
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