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fbdev/metronomefb: Generate deferred I/O ops

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Use the existing generator macros to create deferred-I/O helpers
for metronomefb and set them in the fb_ops structure. Functions
for damage handling on memory ranges and areas are provided by
the driver.

Metronomefb's implementation of fb_write writes to system memory,
so the generated code can use the respective helper internally.
This also fixes a long-standing bug where fb_write returned an
errno code instead of the number of written bytes. See the commit
message of commit 921b7383f348 ("fbdev: Return number of bytes
read or written") for more details.

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Helge Deller <deller@gmx.de>
Link: https://patchwork.freedesktop.org/patch/msgid/20230706151432.20674-7-tzimmermann@suse.de
This commit is contained in:
Thomas Zimmermann 2023-07-06 17:08:49 +02:00
parent f32c224008
commit 692411e5e1
1 changed files with 8 additions and 66 deletions
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74
drivers/video/fbdev/metronomefb.c
View File

@ -483,86 +483,28 @@ static void metronomefb_dpy_deferred_io(struct fb_info *info, struct list_head *
metronome_display_cmd(par);
}
static void metronomefb_fillrect(struct fb_info *info,
const struct fb_fillrect *rect)
static void metronomefb_defio_damage_range(struct fb_info *info, off_t off, size_t len)
{
struct metronomefb_par *par = info->par;
sys_fillrect(info, rect);
metronomefb_dpy_update(par);
}
static void metronomefb_copyarea(struct fb_info *info,
const struct fb_copyarea *area)
static void metronomefb_defio_damage_area(struct fb_info *info, u32 x, u32 y,
u32 width, u32 height)
{
struct metronomefb_par *par = info->par;
sys_copyarea(info, area);
metronomefb_dpy_update(par);
}
static void metronomefb_imageblit(struct fb_info *info,
const struct fb_image *image)
{
struct metronomefb_par *par = info->par;
sys_imageblit(info, image);
metronomefb_dpy_update(par);
}
/*
* this is the slow path from userspace. they can seek and write to
* the fb. it is based on fb_sys_write
*/
static ssize_t metronomefb_write(struct fb_info *info, const char __user *buf,
size_t count, loff_t *ppos)
{
struct metronomefb_par *par = info->par;
unsigned long p = *ppos;
void *dst;
int err = 0;
unsigned long total_size;
if (!info->screen_buffer)
return -ENODEV;
total_size = info->fix.smem_len;
if (p > total_size)
return -EFBIG;
if (count > total_size) {
err = -EFBIG;
count = total_size;
}
if (count + p > total_size) {
if (!err)
err = -ENOSPC;
count = total_size - p;
}
dst = info->screen_buffer + p;
if (copy_from_user(dst, buf, count))
err = -EFAULT;
if (!err)
*ppos += count;
metronomefb_dpy_update(par);
return (err) ? err : count;
}
FB_GEN_DEFAULT_DEFERRED_SYS_OPS(metronomefb,
metronomefb_defio_damage_range,
metronomefb_defio_damage_area)
static const struct fb_ops metronomefb_ops = {
.owner = THIS_MODULE,
.fb_write = metronomefb_write,
.fb_fillrect = metronomefb_fillrect,
.fb_copyarea = metronomefb_copyarea,
.fb_imageblit = metronomefb_imageblit,
.fb_mmap = fb_deferred_io_mmap,
.owner = THIS_MODULE,
FB_DEFAULT_DEFERRED_OPS(metronomefb),
};
static struct fb_deferred_io metronomefb_defio = {