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Merge branch 'fbmem'

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* fbmem:
  fbmem: make read/write/ioctl use the frame buffer at open time
  fbcon: add lifetime refcount to opened frame buffers
This commit is contained in:
Linus Torvalds 2011-05-12 10:42:36 -07:00
commit df43938bc5
2 changed files with 81 additions and 26 deletions
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106
drivers/video/fbmem.c
View File

@ -42,9 +42,34 @@
#define FBPIXMAPSIZE (1024 * 8)
static DEFINE_MUTEX(registration_lock);
struct fb_info *registered_fb[FB_MAX] __read_mostly;
int num_registered_fb __read_mostly;
static struct fb_info *get_fb_info(unsigned int idx)
{
struct fb_info *fb_info;
if (idx >= FB_MAX)
return ERR_PTR(-ENODEV);
mutex_lock(&registration_lock);
fb_info = registered_fb[idx];
if (fb_info)
atomic_inc(&fb_info->count);
mutex_unlock(&registration_lock);
return fb_info;
}
static void put_fb_info(struct fb_info *fb_info)
{
if (!atomic_dec_and_test(&fb_info->count))
return;
if (fb_info->fbops->fb_destroy)
fb_info->fbops->fb_destroy(fb_info);
}
int lock_fb_info(struct fb_info *info)
{
mutex_lock(&info->lock);
@ -647,6 +672,7 @@ int fb_show_logo(struct fb_info *info, int rotate) { return 0; }
static void *fb_seq_start(struct seq_file *m, loff_t *pos)
{
mutex_lock(&registration_lock);
return (*pos < FB_MAX) ? pos : NULL;
}
@ -658,6 +684,7 @@ static void *fb_seq_next(struct seq_file *m, void *v, loff_t *pos)
static void fb_seq_stop(struct seq_file *m, void *v)
{
mutex_unlock(&registration_lock);
}
static int fb_seq_show(struct seq_file *m, void *v)
@ -690,13 +717,30 @@ static const struct file_operations fb_proc_fops = {
.release = seq_release,
};
/*
* We hold a reference to the fb_info in file->private_data,
* but if the current registered fb has changed, we don't
* actually want to use it.
*
* So look up the fb_info using the inode minor number,
* and just verify it against the reference we have.
*/
static struct fb_info *file_fb_info(struct file *file)
{
struct inode *inode = file->f_path.dentry->d_inode;
int fbidx = iminor(inode);
struct fb_info *info = registered_fb[fbidx];
if (info != file->private_data)
info = NULL;
return info;
}
static ssize_t
fb_read(struct file *file, char __user *buf, size_t count, loff_t *ppos)
{
unsigned long p = *ppos;
struct inode *inode = file->f_path.dentry->d_inode;
int fbidx = iminor(inode);
struct fb_info *info = registered_fb[fbidx];
struct fb_info *info = file_fb_info(file);
u8 *buffer, *dst;
u8 __iomem *src;
int c, cnt = 0, err = 0;
@ -761,9 +805,7 @@ static ssize_t
fb_write(struct file *file, const char __user *buf, size_t count, loff_t *ppos)
{
unsigned long p = *ppos;
struct inode *inode = file->f_path.dentry->d_inode;
int fbidx = iminor(inode);
struct fb_info *info = registered_fb[fbidx];
struct fb_info *info = file_fb_info(file);
u8 *buffer, *src;
u8 __iomem *dst;
int c, cnt = 0, err = 0;
@ -1141,10 +1183,10 @@ static long do_fb_ioctl(struct fb_info *info, unsigned int cmd,
static long fb_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct inode *inode = file->f_path.dentry->d_inode;
int fbidx = iminor(inode);
struct fb_info *info = registered_fb[fbidx];
struct fb_info *info = file_fb_info(file);
if (!info)
return -ENODEV;
return do_fb_ioctl(info, cmd, arg);
}
@ -1265,12 +1307,13 @@ static int fb_get_fscreeninfo(struct fb_info *info, unsigned int cmd,
static long fb_compat_ioctl(struct file *file, unsigned int cmd,
unsigned long arg)
{
struct inode *inode = file->f_path.dentry->d_inode;
int fbidx = iminor(inode);
struct fb_info *info = registered_fb[fbidx];
struct fb_ops *fb = info->fbops;
struct fb_info *info = file_fb_info(file);
struct fb_ops *fb;
long ret = -ENOIOCTLCMD;
if (!info)
return -ENODEV;
fb = info->fbops;
switch(cmd) {
case FBIOGET_VSCREENINFO:
case FBIOPUT_VSCREENINFO:
@ -1303,16 +1346,18 @@ static long fb_compat_ioctl(struct file *file, unsigned int cmd,
static int
fb_mmap(struct file *file, struct vm_area_struct * vma)
{
int fbidx = iminor(file->f_path.dentry->d_inode);
struct fb_info *info = registered_fb[fbidx];
struct fb_ops *fb = info->fbops;
struct fb_info *info = file_fb_info(file);
struct fb_ops *fb;
unsigned long off;
unsigned long start;
u32 len;
if (!info)
return -ENODEV;
if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
return -EINVAL;
off = vma->vm_pgoff << PAGE_SHIFT;
fb = info->fbops;
if (!fb)
return -ENODEV;
mutex_lock(&info->mm_lock);
@ -1361,14 +1406,16 @@ __releases(&info->lock)
struct fb_info *info;
int res = 0;
if (fbidx >= FB_MAX)
return -ENODEV;
info = registered_fb[fbidx];
if (!info)
info = get_fb_info(fbidx);
if (!info) {
request_module("fb%d", fbidx);
info = registered_fb[fbidx];
if (!info)
return -ENODEV;
info = get_fb_info(fbidx);
if (!info)
return -ENODEV;
}
if (IS_ERR(info))
return PTR_ERR(info);
mutex_lock(&info->lock);
if (!try_module_get(info->fbops->owner)) {
res = -ENODEV;
@ -1386,6 +1433,8 @@ __releases(&info->lock)
#endif
out:
mutex_unlock(&info->lock);
if (res)
put_fb_info(info);
return res;
}
@ -1401,6 +1450,7 @@ __releases(&info->lock)
info->fbops->fb_release(info,1);
module_put(info->fbops->owner);
mutex_unlock(&info->lock);
put_fb_info(info);
return 0;
}
@ -1542,11 +1592,13 @@ register_framebuffer(struct fb_info *fb_info)
remove_conflicting_framebuffers(fb_info->apertures, fb_info->fix.id,
fb_is_primary_device(fb_info));
mutex_lock(&registration_lock);
num_registered_fb++;
for (i = 0 ; i < FB_MAX; i++)
if (!registered_fb[i])
break;
fb_info->node = i;
atomic_set(&fb_info->count, 1);
mutex_init(&fb_info->lock);
mutex_init(&fb_info->mm_lock);
@ -1583,6 +1635,7 @@ register_framebuffer(struct fb_info *fb_info)
fb_var_to_videomode(&mode, &fb_info->var);
fb_add_videomode(&mode, &fb_info->modelist);
registered_fb[i] = fb_info;
mutex_unlock(&registration_lock);
event.info = fb_info;
if (!lock_fb_info(fb_info))
@ -1616,6 +1669,7 @@ unregister_framebuffer(struct fb_info *fb_info)
struct fb_event event;
int i, ret = 0;
mutex_lock(&registration_lock);
i = fb_info->node;
if (!registered_fb[i]) {
ret = -EINVAL;
@ -1638,7 +1692,7 @@ unregister_framebuffer(struct fb_info *fb_info)
(fb_info->pixmap.flags & FB_PIXMAP_DEFAULT))
kfree(fb_info->pixmap.addr);
fb_destroy_modelist(&fb_info->modelist);
registered_fb[i]=NULL;
registered_fb[i] = NULL;
num_registered_fb--;
fb_cleanup_device(fb_info);
device_destroy(fb_class, MKDEV(FB_MAJOR, i));
@ -1646,9 +1700,9 @@ unregister_framebuffer(struct fb_info *fb_info)
fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
/* this may free fb info */
if (fb_info->fbops->fb_destroy)
fb_info->fbops->fb_destroy(fb_info);
put_fb_info(fb_info);
done:
mutex_unlock(&registration_lock);
return ret;
}

1
include/linux/fb.h
View File

@ -832,6 +832,7 @@ struct fb_tile_ops {
#define FBINFO_CAN_FORCE_OUTPUT 0x200000
struct fb_info {
atomic_t count;
int node;
int flags;
struct mutex lock; /* Lock for open/release/ioctl funcs */