Release 4.7 drivers/video/fbdev/core/fb_defio.c
/*
* linux/drivers/video/fb_defio.c
*
* 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
* for more details.
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/errno.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/vmalloc.h>
#include <linux/delay.h>
#include <linux/interrupt.h>
#include <linux/fb.h>
#include <linux/list.h>
/* to support deferred IO */
#include <linux/rmap.h>
#include <linux/pagemap.h>
static 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;
}
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| Total | 74 | 100.00% | 2 | 100.00% |
/* 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)
{
unsigned long offset;
struct page *page;
struct fb_info *info = vma->vm_private_data;
offset = vmf->pgoff << PAGE_SHIFT;
if (offset >= info->fix.smem_len)
return VM_FAULT_SIGBUS;
page = fb_deferred_io_page(info, offset);
if (!page)
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;
}
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| Total | 125 | 100.00% | 4 | 100.00% |
int fb_deferred_io_fsync(struct file *file, loff_t start, loff_t end, int datasync)
{
struct fb_info *info = file->private_data;
struct inode *inode = file_inode(file);
int err = filemap_write_and_wait_range(inode->i_mapping, start, end);
if (err)
return err;
/* Skip if deferred io is compiled-in but disabled on this fbdev */
if (!info->fbdefio)
return 0;
inode_lock(inode);
/* Kill off the delayed work */
cancel_delayed_work_sync(&info->deferred_work);
/* Run it immediately */
schedule_delayed_work(&info->deferred_work, 0);
inode_unlock(inode);
return 0;
}
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| thadeu lima de souza cascardo | thadeu lima de souza cascardo | 1 | 0.97% | 1 | 12.50% |
| tejun heo | tejun heo | 1 | 0.97% | 1 | 12.50% |
| Total | 103 | 100.00% | 8 | 100.00% |
EXPORT_SYMBOL_GPL(fb_deferred_io_fsync);
/* vm_ops->page_mkwrite handler */
static int fb_deferred_io_mkwrite(struct vm_area_struct *vma,
struct vm_fault *vmf)
{
struct page *page = vmf->page;
struct fb_info *info = vma->vm_private_data;
struct fb_deferred_io *fbdefio = info->fbdefio;
struct page *cur;
/* this is a callback we get when userspace first tries to
write to the page. we schedule a workqueue. that workqueue
will eventually mkclean the touched pages and execute the
deferred framebuffer IO. then if userspace touches a page
again, we repeat the same scheme */
file_update_time(vma->vm_file);
/* protect against the workqueue changing the page list */
mutex_lock(&fbdefio->lock);
/* first write in this cycle, notify the driver */
if (fbdefio->first_io && list_empty(&fbdefio->pagelist))
fbdefio->first_io(info);
/*
* We want the page to remain locked from ->page_mkwrite until
* the PTE is marked dirty to avoid page_mkclean() being called
* before the PTE is updated, which would leave the page ignored
* by defio.
* Do this by locking the page here and informing the caller
* about it with VM_FAULT_LOCKED.
*/
lock_page(page);
/* we loop through the pagelist before adding in order
to keep the pagelist sorted */
list_for_each_entry(cur, &fbdefio->pagelist, lru) {
/* this check is to catch the case where a new
process could start writing to the same page
through a new pte. this new access can cause the
mkwrite even when the original ps's pte is marked
writable */
if (unlikely(cur == page))
goto page_already_added;
else if (cur->index > page->index)
break;
}
list_add_tail(&page->lru, &cur->lru);
page_already_added:
mutex_unlock(&fbdefio->lock);
/* come back after delay to process the deferred IO */
schedule_delayed_work(&info->deferred_work, fbdefio->delay);
return VM_FAULT_LOCKED;
}
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| nick piggin | nick piggin | 11 | 6.55% | 1 | 14.29% |
| jan kara | jan kara | 7 | 4.17% | 1 | 14.29% |
| albert herranz | albert herranz | 7 | 4.17% | 1 | 14.29% |
| adrian bunk | adrian bunk | 1 | 0.60% | 1 | 14.29% |
| Total | 168 | 100.00% | 7 | 100.00% |
static const struct vm_operations_struct fb_deferred_io_vm_ops = {
.fault = fb_deferred_io_fault,
.page_mkwrite = fb_deferred_io_mkwrite,
};
static int fb_deferred_io_set_page_dirty(struct page *page)
{
if (!PageDirty(page))
SetPageDirty(page);
return 0;
}
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| Total | 27 | 100.00% | 1 | 100.00% |
static const struct address_space_operations fb_deferred_io_aops = {
.set_page_dirty = fb_deferred_io_set_page_dirty,
};
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_DONTEXPAND | VM_DONTDUMP;
if (!(info->flags & FBINFO_VIRTFB))
vma->vm_flags |= VM_IO;
vma->vm_private_data = info;
return 0;
}
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| Person | Tokens | Prop | Commits | CommitProp |
| jaya kumar | jaya kumar | 37 | 66.07% | 1 | 33.33% |
| konrad rzeszutek wilk | konrad rzeszutek wilk | 17 | 30.36% | 1 | 33.33% |
| konstantin khlebnikov | konstantin khlebnikov | 2 | 3.57% | 1 | 33.33% |
| Total | 56 | 100.00% | 3 | 100.00% |
EXPORT_SYMBOL(fb_deferred_io_mmap);
/* workqueue callback */
static void fb_deferred_io_work(struct work_struct *work)
{
struct fb_info *info = container_of(work, struct fb_info,
deferred_work.work);
struct list_head *node, *next;
struct page *cur;
struct fb_deferred_io *fbdefio = info->fbdefio;
/* here we mkclean the pages, then do all deferred IO */
mutex_lock(&fbdefio->lock);
list_for_each_entry(cur, &fbdefio->pagelist, lru) {
lock_page(cur);
page_mkclean(cur);
unlock_page(cur);
}
/* driver's callback with pagelist */
fbdefio->deferred_io(info, &fbdefio->pagelist);
/* clear the list */
list_for_each_safe(node, next, &fbdefio->pagelist) {
list_del(node);
}
mutex_unlock(&fbdefio->lock);
}
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| Total | 121 | 100.00% | 3 | 100.00% |
void fb_deferred_io_init(struct fb_info *info)
{
struct fb_deferred_io *fbdefio = info->fbdefio;
BUG_ON(!fbdefio);
mutex_init(&fbdefio->lock);
info->fbops->fb_mmap = fb_deferred_io_mmap;
INIT_DELAYED_WORK(&info->deferred_work, fb_deferred_io_work);
INIT_LIST_HEAD(&fbdefio->pagelist);
if (fbdefio->delay == 0) /* set a default of 1 s */
fbdefio->delay = HZ;
}
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| jaya kumar | jaya kumar | 74 | 100.00% | 1 | 100.00% |
| Total | 74 | 100.00% | 1 | 100.00% |
EXPORT_SYMBOL_GPL(fb_deferred_io_init);
void fb_deferred_io_open(struct fb_info *info,
struct inode *inode,
struct file *file)
{
file->f_mapping->a_ops = &fb_deferred_io_aops;
}
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| Total | 29 | 100.00% | 1 | 100.00% |
EXPORT_SYMBOL_GPL(fb_deferred_io_open);
void fb_deferred_io_cleanup(struct fb_info *info)
{
struct fb_deferred_io *fbdefio = info->fbdefio;
struct page *page;
int i;
BUG_ON(!fbdefio);
cancel_delayed_work_sync(&info->deferred_work);
/* clear out the mapping that we setup */
for (i = 0 ; i < info->fix.smem_len; i += PAGE_SIZE) {
page = fb_deferred_io_page(info, i);
page->mapping = NULL;
}
info->fbops->fb_mmap = NULL;
mutex_destroy(&fbdefio->lock);
}
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| magnus damm | magnus damm | 19 | 20.43% | 2 | 40.00% |
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| Total | 93 | 100.00% | 5 | 100.00% |
EXPORT_SYMBOL_GPL(fb_deferred_io_cleanup);
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| ian campbell | ian campbell | 74 | 7.65% | 1 | 3.57% |
| paul mundt | paul mundt | 46 | 4.76% | 1 | 3.57% |
| josef bacik | josef bacik | 44 | 4.55% | 1 | 3.57% |
| albert herranz | albert herranz | 31 | 3.21% | 3 | 10.71% |
| nick piggin | nick piggin | 27 | 2.79% | 2 | 7.14% |
| heiko stuebner | heiko stuebner | 22 | 2.28% | 1 | 3.57% |
| konrad rzeszutek wilk | konrad rzeszutek wilk | 17 | 1.76% | 1 | 3.57% |
| jan kara | jan kara | 7 | 0.72% | 1 | 3.57% |
| noralf tronnes | noralf tronnes | 5 | 0.52% | 1 | 3.57% |
| al viro | al viro | 5 | 0.52% | 2 | 7.14% |
| konstantin khlebnikov | konstantin khlebnikov | 2 | 0.21% | 1 | 3.57% |
| tejun heo | tejun heo | 2 | 0.21% | 2 | 7.14% |
| alexey dobriyan | alexey dobriyan | 1 | 0.10% | 1 | 3.57% |
| tomi valkeinen | tomi valkeinen | 1 | 0.10% | 1 | 3.57% |
| h hartley sweeten | h hartley sweeten | 1 | 0.10% | 1 | 3.57% |
| adrian bunk | adrian bunk | 1 | 0.10% | 1 | 3.57% |
| thadeu lima de souza cascardo | thadeu lima de souza cascardo | 1 | 0.10% | 1 | 3.57% |
| Total | 967 | 100.00% | 28 | 100.00% |
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