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42f59b83f0
commit babc250e27 upstream.
Rendering calls may be done simultaneously from the workqueue,
dlfb_ops_write, dlfb_ops_ioctl, dlfb_ops_set_par and dlfb_dpy_deferred_io.
The code is robust enough so that it won't crash on concurrent rendering.
However, concurrent rendering may cause display corruption if the same
pixel is simultaneously being rendered. In order to avoid this corruption,
this patch adds a mutex around the rendering calls.
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: Bernie Thompson <bernie@plugable.com>
Cc: Ladislav Michl <ladis@linux-mips.org>
Cc: <stable@vger.kernel.org>
[b.zolnierkie: replace "dlfb:" with "uldfb:" in the patch summary]
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
104 lines
2.9 KiB
C
104 lines
2.9 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef UDLFB_H
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#define UDLFB_H
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/*
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* TODO: Propose standard fb.h ioctl for reporting damage,
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* using _IOWR() and one of the existing area structs from fb.h
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* Consider these ioctls deprecated, but they're still used by the
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* DisplayLink X server as yet - need both to be modified in tandem
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* when new ioctl(s) are ready.
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*/
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#define DLFB_IOCTL_RETURN_EDID 0xAD
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#define DLFB_IOCTL_REPORT_DAMAGE 0xAA
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struct dloarea {
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int x, y;
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int w, h;
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int x2, y2;
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};
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struct urb_node {
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struct list_head entry;
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struct dlfb_data *dlfb;
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struct urb *urb;
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};
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struct urb_list {
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struct list_head list;
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spinlock_t lock;
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struct semaphore limit_sem;
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int available;
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int count;
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size_t size;
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};
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struct dlfb_data {
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struct usb_device *udev;
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struct fb_info *info;
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struct urb_list urbs;
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char *backing_buffer;
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int fb_count;
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bool virtualized; /* true when physical usb device not present */
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atomic_t usb_active; /* 0 = update virtual buffer, but no usb traffic */
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atomic_t lost_pixels; /* 1 = a render op failed. Need screen refresh */
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char *edid; /* null until we read edid from hw or get from sysfs */
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size_t edid_size;
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int sku_pixel_limit;
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int base16;
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int base8;
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u32 pseudo_palette[256];
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int blank_mode; /*one of FB_BLANK_ */
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struct mutex render_mutex;
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int damage_x;
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int damage_y;
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int damage_x2;
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int damage_y2;
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spinlock_t damage_lock;
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struct work_struct damage_work;
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struct fb_ops ops;
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/* blit-only rendering path metrics, exposed through sysfs */
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atomic_t bytes_rendered; /* raw pixel-bytes driver asked to render */
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atomic_t bytes_identical; /* saved effort with backbuffer comparison */
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atomic_t bytes_sent; /* to usb, after compression including overhead */
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atomic_t cpu_kcycles_used; /* transpired during pixel processing */
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struct fb_var_screeninfo current_mode;
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struct list_head deferred_free;
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};
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#define NR_USB_REQUEST_I2C_SUB_IO 0x02
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#define NR_USB_REQUEST_CHANNEL 0x12
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/* -BULK_SIZE as per usb-skeleton. Can we get full page and avoid overhead? */
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#define BULK_SIZE 512
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#define MAX_TRANSFER (PAGE_SIZE*16 - BULK_SIZE)
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#define WRITES_IN_FLIGHT (4)
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#define MAX_VENDOR_DESCRIPTOR_SIZE 256
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#define GET_URB_TIMEOUT HZ
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#define FREE_URB_TIMEOUT (HZ*2)
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#define BPP 2
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#define MAX_CMD_PIXELS 255
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#define RLX_HEADER_BYTES 7
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#define MIN_RLX_PIX_BYTES 4
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#define MIN_RLX_CMD_BYTES (RLX_HEADER_BYTES + MIN_RLX_PIX_BYTES)
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#define RLE_HEADER_BYTES 6
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#define MIN_RLE_PIX_BYTES 3
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#define MIN_RLE_CMD_BYTES (RLE_HEADER_BYTES + MIN_RLE_PIX_BYTES)
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#define RAW_HEADER_BYTES 6
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#define MIN_RAW_PIX_BYTES 2
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#define MIN_RAW_CMD_BYTES (RAW_HEADER_BYTES + MIN_RAW_PIX_BYTES)
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#define DL_DEFIO_WRITE_DELAY msecs_to_jiffies(HZ <= 300 ? 4 : 10) /* optimal value for 720p video */
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#define DL_DEFIO_WRITE_DISABLE (HZ*60) /* "disable" with long delay */
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/* remove these once align.h patch is taken into kernel */
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#define DL_ALIGN_UP(x, a) ALIGN(x, a)
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#define DL_ALIGN_DOWN(x, a) ALIGN_DOWN(x, a)
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#endif
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