staging: udlfb: fix incorrect fb_defio implementation for multiple framebuffers
Fix fb_defio bug in udlfb for multiple framebuffers Previously when using fb_defio with multiple DisplayLink attached displays udlfb incorrectly used a shared datastructure where it needed to have one per fb_info struct. This was completely broken and caused all kinds of problems, including rendering to one framebuffer affecting others. Signed-off-by: Bernie Thompson <bernie@plugable.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
parent
d5fa13361b
commit
5bea1fbf94
|
@ -70,11 +70,6 @@ static int dlfb_submit_urb(struct dlfb_data *dev, struct urb * urb, size_t len);
|
|||
static int dlfb_alloc_urb_list(struct dlfb_data *dev, int count, size_t size);
|
||||
static void dlfb_free_urb_list(struct dlfb_data *dev);
|
||||
|
||||
/* other symbols with dependents */
|
||||
#ifdef CONFIG_FB_DEFERRED_IO
|
||||
static struct fb_deferred_io dlfb_defio;
|
||||
#endif
|
||||
|
||||
/*
|
||||
* All DisplayLink bulk operations start with 0xAF, followed by specific code
|
||||
* All operations are written to buffers which then later get sent to device
|
||||
|
@ -481,7 +476,7 @@ static void dlfb_compress_hline(
|
|||
* (that we can only write to, slowly, and can never read), and (optionally)
|
||||
* our shadow copy that tracks what's been sent to that hardware buffer.
|
||||
*/
|
||||
static void dlfb_render_hline(struct dlfb_data *dev, struct urb **urb_ptr,
|
||||
static int dlfb_render_hline(struct dlfb_data *dev, struct urb **urb_ptr,
|
||||
const char *front, char **urb_buf_ptr,
|
||||
u32 byte_offset, u32 byte_width,
|
||||
int *ident_ptr, int *sent_ptr)
|
||||
|
@ -523,11 +518,11 @@ static void dlfb_render_hline(struct dlfb_data *dev, struct urb **urb_ptr,
|
|||
if (cmd >= cmd_end) {
|
||||
int len = cmd - (u8 *) urb->transfer_buffer;
|
||||
if (dlfb_submit_urb(dev, urb, len))
|
||||
return; /* lost pixels is set */
|
||||
return 1; /* lost pixels is set */
|
||||
*sent_ptr += len;
|
||||
urb = dlfb_get_urb(dev);
|
||||
if (!urb)
|
||||
return; /* lost_pixels is set */
|
||||
return 1; /* lost_pixels is set */
|
||||
*urb_ptr = urb;
|
||||
cmd = urb->transfer_buffer;
|
||||
cmd_end = &cmd[urb->transfer_buffer_length];
|
||||
|
@ -535,6 +530,8 @@ static void dlfb_render_hline(struct dlfb_data *dev, struct urb **urb_ptr,
|
|||
}
|
||||
|
||||
*urb_buf_ptr = cmd;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int dlfb_handle_damage(struct dlfb_data *dev, int x, int y,
|
||||
|
@ -571,9 +568,11 @@ int dlfb_handle_damage(struct dlfb_data *dev, int x, int y,
|
|||
const int line_offset = dev->info->fix.line_length * i;
|
||||
const int byte_offset = line_offset + (x * BPP);
|
||||
|
||||
dlfb_render_hline(dev, &urb, (char *) dev->info->fix.smem_start,
|
||||
if (dlfb_render_hline(dev, &urb,
|
||||
(char *) dev->info->fix.smem_start,
|
||||
&cmd, byte_offset, width * BPP,
|
||||
&bytes_identical, &bytes_sent);
|
||||
&bytes_identical, &bytes_sent))
|
||||
goto error;
|
||||
}
|
||||
|
||||
if (cmd > (char *) urb->transfer_buffer) {
|
||||
|
@ -584,6 +583,7 @@ int dlfb_handle_damage(struct dlfb_data *dev, int x, int y,
|
|||
} else
|
||||
dlfb_urb_completion(urb);
|
||||
|
||||
error:
|
||||
atomic_add(bytes_sent, &dev->bytes_sent);
|
||||
atomic_add(bytes_identical, &dev->bytes_identical);
|
||||
atomic_add(width*height*2, &dev->bytes_rendered);
|
||||
|
@ -722,9 +722,10 @@ static void dlfb_dpy_deferred_io(struct fb_info *info,
|
|||
/* walk the written page list and render each to device */
|
||||
list_for_each_entry(cur, &fbdefio->pagelist, lru) {
|
||||
|
||||
dlfb_render_hline(dev, &urb, (char *) info->fix.smem_start,
|
||||
if (dlfb_render_hline(dev, &urb, (char *) info->fix.smem_start,
|
||||
&cmd, cur->index << PAGE_SHIFT,
|
||||
PAGE_SIZE, &bytes_identical, &bytes_sent);
|
||||
PAGE_SIZE, &bytes_identical, &bytes_sent))
|
||||
goto error;
|
||||
bytes_rendered += PAGE_SIZE;
|
||||
}
|
||||
|
||||
|
@ -736,6 +737,7 @@ static void dlfb_dpy_deferred_io(struct fb_info *info,
|
|||
} else
|
||||
dlfb_urb_completion(urb);
|
||||
|
||||
error:
|
||||
atomic_add(bytes_sent, &dev->bytes_sent);
|
||||
atomic_add(bytes_identical, &dev->bytes_identical);
|
||||
atomic_add(bytes_rendered, &dev->bytes_rendered);
|
||||
|
@ -796,6 +798,16 @@ static int dlfb_ops_ioctl(struct fb_info *info, unsigned int cmd,
|
|||
/* TODO: Help propose a standard fb.h ioctl to report mmap damage */
|
||||
if (cmd == DLFB_IOCTL_REPORT_DAMAGE) {
|
||||
|
||||
/*
|
||||
* If we have a damage-aware client, turn fb_defio "off"
|
||||
* To avoid perf imact of unecessary page fault handling.
|
||||
* Done by resetting the delay for this fb_info to a very
|
||||
* long period. Pages will become writable and stay that way.
|
||||
* Reset to normal value when all clients have closed this fb.
|
||||
*/
|
||||
if (info->fbdefio)
|
||||
info->fbdefio->delay = DL_DEFIO_WRITE_DISABLE;
|
||||
|
||||
area = (struct dloarea *)arg;
|
||||
|
||||
if (area->x < 0)
|
||||
|
@ -871,8 +883,18 @@ static int dlfb_ops_open(struct fb_info *info, int user)
|
|||
|
||||
#ifdef CONFIG_FB_DEFERRED_IO
|
||||
if (fb_defio && (info->fbdefio == NULL)) {
|
||||
/* enable defio */
|
||||
info->fbdefio = &dlfb_defio;
|
||||
/* enable defio at last moment if not disabled by client */
|
||||
|
||||
struct fb_deferred_io *fbdefio;
|
||||
|
||||
fbdefio = kmalloc(GFP_KERNEL, sizeof(struct fb_deferred_io));
|
||||
|
||||
if (fbdefio) {
|
||||
fbdefio->delay = DL_DEFIO_WRITE_DELAY;
|
||||
fbdefio->deferred_io = dlfb_dpy_deferred_io;
|
||||
}
|
||||
|
||||
info->fbdefio = fbdefio;
|
||||
fb_deferred_io_init(info);
|
||||
}
|
||||
#endif
|
||||
|
@ -906,6 +928,13 @@ static void dlfb_free(struct kref *kref)
|
|||
kfree(dev);
|
||||
}
|
||||
|
||||
static void dlfb_release_urb_work(struct work_struct *work)
|
||||
{
|
||||
struct urb_node *unode = container_of(work, struct urb_node,
|
||||
release_urb_work.work);
|
||||
|
||||
up(&unode->dev->urbs.limit_sem);
|
||||
}
|
||||
|
||||
static void dlfb_free_framebuffer_work(struct work_struct *work)
|
||||
{
|
||||
|
@ -1415,15 +1444,6 @@ static struct device_attribute fb_device_attrs[] = {
|
|||
__ATTR(metrics_reset, S_IWUGO, NULL, metrics_reset_store),
|
||||
};
|
||||
|
||||
#ifdef CONFIG_FB_DEFERRED_IO
|
||||
|
||||
static struct fb_deferred_io dlfb_defio = {
|
||||
.delay = 5,
|
||||
.deferred_io = dlfb_dpy_deferred_io,
|
||||
};
|
||||
|
||||
#endif
|
||||
|
||||
/*
|
||||
* This is necessary before we can communicate with the display controller.
|
||||
*/
|
||||
|
@ -1730,6 +1750,13 @@ static void dlfb_urb_completion(struct urb *urb)
|
|||
dev->urbs.available++;
|
||||
spin_unlock_irqrestore(&dev->urbs.lock, flags);
|
||||
|
||||
/*
|
||||
* When using fb_defio, we deadlock if up() is called
|
||||
* while another is waiting. So queue to another process.
|
||||
*/
|
||||
if (fb_defio)
|
||||
schedule_delayed_work(&unode->release_urb_work, 0);
|
||||
else
|
||||
up(&dev->urbs.limit_sem);
|
||||
}
|
||||
|
||||
|
@ -1789,6 +1816,9 @@ static int dlfb_alloc_urb_list(struct dlfb_data *dev, int count, size_t size)
|
|||
break;
|
||||
unode->dev = dev;
|
||||
|
||||
INIT_DELAYED_WORK(&unode->release_urb_work,
|
||||
dlfb_release_urb_work);
|
||||
|
||||
urb = usb_alloc_urb(0, GFP_KERNEL);
|
||||
if (!urb) {
|
||||
kfree(unode);
|
||||
|
@ -1835,7 +1865,8 @@ static struct urb *dlfb_get_urb(struct dlfb_data *dev)
|
|||
ret = down_timeout(&dev->urbs.limit_sem, GET_URB_TIMEOUT);
|
||||
if (ret) {
|
||||
atomic_set(&dev->lost_pixels, 1);
|
||||
dl_err("wait for urb interrupted: %x\n", ret);
|
||||
dl_warn("wait for urb interrupted: %x available: %d\n",
|
||||
ret, dev->urbs.available);
|
||||
goto error;
|
||||
}
|
||||
|
||||
|
|
|
@ -19,6 +19,7 @@ struct dloarea {
|
|||
struct urb_node {
|
||||
struct list_head entry;
|
||||
struct dlfb_data *dev;
|
||||
struct delayed_work release_urb_work;
|
||||
struct urb *urb;
|
||||
};
|
||||
|
||||
|
@ -87,6 +88,9 @@ struct dlfb_data {
|
|||
#define MIN_RAW_PIX_BYTES 2
|
||||
#define MIN_RAW_CMD_BYTES (RAW_HEADER_BYTES + MIN_RAW_PIX_BYTES)
|
||||
|
||||
#define DL_DEFIO_WRITE_DELAY 5 /* fb_deferred_io.delay in jiffies */
|
||||
#define DL_DEFIO_WRITE_DISABLE (HZ*60) /* "disable" with long delay */
|
||||
|
||||
/* remove these once align.h patch is taken into kernel */
|
||||
#define DL_ALIGN_UP(x, a) ALIGN(x, a)
|
||||
#define DL_ALIGN_DOWN(x, a) ALIGN(x-(a-1), a)
|
||||
|
|
Loading…
Reference in New Issue