From de7c6d15e354bc94a846f03749819768c331280a Mon Sep 17 00:00:00 2001 From: Jaya Kumar Date: Wed, 19 Mar 2008 17:01:10 -0700 Subject: fbdev: defio and Metronomefb Implement support for the E-Ink Metronome controller. It provides an mmapable interface to the controller using defio support. It was tested with a gumstix pxa255 with Vizplex media using Xfbdev and various X clients such as xeyes, xpdf, xloadimage. This patch also fixes the following bug: Defio would cause a hang on write access to the framebuffer as the page fault would be called ad-infinitum. It fixes fb_defio by setting the mapping to be used by page_mkclean. Signed-off-by: Jaya Kumar Cc: "Antonino A. Daplas" Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- drivers/video/fb_defio.c | 22 ++++++++++++++++++++-- 1 file changed, 20 insertions(+), 2 deletions(-) (limited to 'drivers/video/fb_defio.c') diff --git a/drivers/video/fb_defio.c b/drivers/video/fb_defio.c index 0f8cfb988c9..24843fdd539 100644 --- a/drivers/video/fb_defio.c +++ b/drivers/video/fb_defio.c @@ -4,7 +4,7 @@ * Copyright (C) 2006 Jaya Kumar * * This file is subject to the terms and conditions of the GNU General Public - * License. See the file COPYING in the main directory of this archive + * License. See the file COPYING in the main directory of this archive * for more details. */ @@ -31,7 +31,7 @@ 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 in System RAM */ + /* info->screen_base is virtual memory */ void *screen_base = (void __force *) info->screen_base; offset = vmf->pgoff << PAGE_SHIFT; @@ -43,6 +43,15 @@ static int fb_deferred_io_fault(struct vm_area_struct *vma, return VM_FAULT_SIGBUS; get_page(page); + + if (vma->vm_file) + page->mapping = vma->vm_file->f_mapping; + else + printk(KERN_ERR "no mapping available\n"); + + BUG_ON(!page->mapping); + page->index = vmf->pgoff; + vmf->page = page; return 0; } @@ -138,11 +147,20 @@ EXPORT_SYMBOL_GPL(fb_deferred_io_init); 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; BUG_ON(!fbdefio); cancel_delayed_work(&info->deferred_work); flush_scheduled_work(); + + /* 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->mapping = NULL; + } } EXPORT_SYMBOL_GPL(fb_deferred_io_cleanup); -- cgit v1.2.3