forked from luck/tmp_suning_uos_patched
68a958a915
The udlfb driver maintained an open count and cleaned up itself when the count reached zero. But the console is also counted in the reference count - so, if the user unplugged the device, the open count would not drop to zero and the driver stayed loaded with console attached. If the user re-plugged the adapter, it would create a device /dev/fb1, show green screen and the access to the console would be lost. The framebuffer subsystem has reference counting on its own - in order to fix the unplug bug, we rely the framebuffer reference counting. When the user unplugs the adapter, we call unregister_framebuffer unconditionally. unregister_framebuffer will unbind the console, wait until all users stop using the framebuffer and then call the fb_destroy method. The fb_destroy cleans up the USB driver. This patch makes the following changes: * Drop dlfb->kref and rely on implicit framebuffer reference counting instead. * dlfb_usb_disconnect calls unregister_framebuffer, the rest of driver cleanup is done in the function dlfb_ops_destroy. dlfb_ops_destroy will be called by the framebuffer subsystem when no processes have the framebuffer open or mapped. * We don't use workqueue during initialization, but initialize directly from dlfb_usb_probe. The workqueue could race with dlfb_usb_disconnect and this racing would produce various kinds of memory corruption. * We use usb_get_dev and usb_put_dev to make sure that the USB subsystem doesn't free the device under us. Signed-off-by: Mikulas Patocka <mpatocka@redhat.com> cc: Dave Airlie <airlied@redhat.com> Cc: Bernie Thompson <bernie@plugable.com>, Cc: Ladislav Michl <ladis@linux-mips.org> Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
97 lines
2.8 KiB
C
97 lines
2.8 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef UDLFB_H
|
|
#define UDLFB_H
|
|
|
|
/*
|
|
* TODO: Propose standard fb.h ioctl for reporting damage,
|
|
* using _IOWR() and one of the existing area structs from fb.h
|
|
* Consider these ioctls deprecated, but they're still used by the
|
|
* DisplayLink X server as yet - need both to be modified in tandem
|
|
* when new ioctl(s) are ready.
|
|
*/
|
|
#define DLFB_IOCTL_RETURN_EDID 0xAD
|
|
#define DLFB_IOCTL_REPORT_DAMAGE 0xAA
|
|
struct dloarea {
|
|
int x, y;
|
|
int w, h;
|
|
int x2, y2;
|
|
};
|
|
|
|
struct urb_node {
|
|
struct list_head entry;
|
|
struct dlfb_data *dlfb;
|
|
struct urb *urb;
|
|
};
|
|
|
|
struct urb_list {
|
|
struct list_head list;
|
|
spinlock_t lock;
|
|
struct semaphore limit_sem;
|
|
int available;
|
|
int count;
|
|
size_t size;
|
|
};
|
|
|
|
struct dlfb_data {
|
|
struct usb_device *udev;
|
|
struct fb_info *info;
|
|
struct urb_list urbs;
|
|
char *backing_buffer;
|
|
int fb_count;
|
|
bool virtualized; /* true when physical usb device not present */
|
|
atomic_t usb_active; /* 0 = update virtual buffer, but no usb traffic */
|
|
atomic_t lost_pixels; /* 1 = a render op failed. Need screen refresh */
|
|
char *edid; /* null until we read edid from hw or get from sysfs */
|
|
size_t edid_size;
|
|
int sku_pixel_limit;
|
|
int base16;
|
|
int base8;
|
|
u32 pseudo_palette[256];
|
|
int blank_mode; /*one of FB_BLANK_ */
|
|
struct fb_ops ops;
|
|
/* blit-only rendering path metrics, exposed through sysfs */
|
|
atomic_t bytes_rendered; /* raw pixel-bytes driver asked to render */
|
|
atomic_t bytes_identical; /* saved effort with backbuffer comparison */
|
|
atomic_t bytes_sent; /* to usb, after compression including overhead */
|
|
atomic_t cpu_kcycles_used; /* transpired during pixel processing */
|
|
struct fb_var_screeninfo current_mode;
|
|
struct list_head deferred_free;
|
|
};
|
|
|
|
#define NR_USB_REQUEST_I2C_SUB_IO 0x02
|
|
#define NR_USB_REQUEST_CHANNEL 0x12
|
|
|
|
/* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */
|
|
#define BULK_SIZE 512
|
|
#define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
|
|
#define WRITES_IN_FLIGHT (4)
|
|
|
|
#define MAX_VENDOR_DESCRIPTOR_SIZE 256
|
|
|
|
#define GET_URB_TIMEOUT HZ
|
|
#define FREE_URB_TIMEOUT (HZ*2)
|
|
|
|
#define BPP 2
|
|
#define MAX_CMD_PIXELS 255
|
|
|
|
#define RLX_HEADER_BYTES 7
|
|
#define MIN_RLX_PIX_BYTES 4
|
|
#define MIN_RLX_CMD_BYTES (RLX_HEADER_BYTES + MIN_RLX_PIX_BYTES)
|
|
|
|
#define RLE_HEADER_BYTES 6
|
|
#define MIN_RLE_PIX_BYTES 3
|
|
#define MIN_RLE_CMD_BYTES (RLE_HEADER_BYTES + MIN_RLE_PIX_BYTES)
|
|
|
|
#define RAW_HEADER_BYTES 6
|
|
#define MIN_RAW_PIX_BYTES 2
|
|
#define MIN_RAW_CMD_BYTES (RAW_HEADER_BYTES + MIN_RAW_PIX_BYTES)
|
|
|
|
#define DL_DEFIO_WRITE_DELAY msecs_to_jiffies(HZ <= 300 ? 4 : 10) /* optimal value for 720p video */
|
|
#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_DOWN(x, a)
|
|
|
|
#endif
|