| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Bernie Thompson | 5685 | 62.38% | 23 | 24.21% |
| Roberto De Ioris | 1140 | 12.51% | 2 | 2.11% |
| Mikulas Patocka | 1134 | 12.44% | 12 | 12.63% |
| Ladislav Michl | 580 | 6.36% | 8 | 8.42% |
| Thomas Zimmermann | 202 | 2.22% | 8 | 8.42% |
| Andrew Kephart | 48 | 0.53% | 1 | 1.05% |
| David Alan Gilbert | 46 | 0.50% | 1 | 1.05% |
| Benjamin Collins | 32 | 0.35% | 1 | 1.05% |
| Pavel Skripkin | 32 | 0.35% | 1 | 1.05% |
| Alan Stern | 29 | 0.32% | 1 | 1.05% |
| Stuart Hopkins | 24 | 0.26% | 1 | 1.05% |
| Liu Yuan | 24 | 0.26% | 1 | 1.05% |
| Olivier Sobrie | 20 | 0.22% | 1 | 1.05% |
| Andrew Morton | 17 | 0.19% | 1 | 1.05% |
| Paul Mundt | 11 | 0.12% | 2 | 2.11% |
| Greg Kroah-Hartman | 11 | 0.12% | 5 | 5.26% |
| Tomi Valkeinen | 10 | 0.11% | 1 | 1.05% |
| William Katsak | 8 | 0.09% | 1 | 1.05% |
| SF Markus Elfring | 7 | 0.08% | 2 | 2.11% |
| Sachin Kamat | 6 | 0.07% | 3 | 3.16% |
| Helge Deller | 5 | 0.05% | 1 | 1.05% |
| Chris Wright | 5 | 0.05% | 1 | 1.05% |
| Dan Carpenter | 5 | 0.05% | 1 | 1.05% |
| Jing Yao | 4 | 0.04% | 1 | 1.05% |
| Joe Perches | 4 | 0.04% | 2 | 2.11% |
| Maksim Salau | 4 | 0.04% | 1 | 1.05% |
| Amit Kucheria | 3 | 0.03% | 1 | 1.05% |
| Jason Yan | 3 | 0.03% | 1 | 1.05% |
| Rusty Russell | 3 | 0.03% | 1 | 1.05% |
| kbuild test robot | 2 | 0.02% | 1 | 1.05% |
| Thomas Gleixner | 2 | 0.02% | 1 | 1.05% |
| Linus Torvalds (pre-git) | 2 | 0.02% | 1 | 1.05% |
| Bhumika Goyal | 1 | 0.01% | 1 | 1.05% |
| Linus Torvalds | 1 | 0.01% | 1 | 1.05% |
| Lucas De Marchi | 1 | 0.01% | 1 | 1.05% |
| Nishka Dasgupta | 1 | 0.01% | 1 | 1.05% |
| Heiko Stübner | 1 | 0.01% | 1 | 1.05% |
| Arvind Yadav | 1 | 0.01% | 1 | 1.05% |
| Total | 9114 | 95 |
// SPDX-License-Identifier: GPL-2.0-only /* * udlfb.c -- Framebuffer driver for DisplayLink USB controller * * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it> * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com> * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com> * * Layout is based on skeletonfb by James Simmons and Geert Uytterhoeven, * usb-skeleton by GregKH. * * Device-specific portions based on information from Displaylink, with work * from Florian Echtler, Henrik Bjerregaard Pedersen, and others. */ #include <linux/module.h> #include <linux/kernel.h> #include <linux/init.h> #include <linux/usb.h> #include <linux/uaccess.h> #include <linux/mm.h> #include <linux/fb.h> #include <linux/vmalloc.h> #include <linux/slab.h> #include <linux/delay.h> #include <asm/unaligned.h> #include <video/udlfb.h> #include "edid.h" #define OUT_EP_NUM 1 /* The endpoint number we will use */ static const struct fb_fix_screeninfo dlfb_fix = { .id = "udlfb", .type = FB_TYPE_PACKED_PIXELS, .visual = FB_VISUAL_TRUECOLOR, .xpanstep = 0, .ypanstep = 0, .ywrapstep = 0, .accel = FB_ACCEL_NONE, }; static const u32 udlfb_info_flags = FBINFO_READS_FAST | FBINFO_VIRTFB | FBINFO_HWACCEL_IMAGEBLIT | FBINFO_HWACCEL_FILLRECT | FBINFO_HWACCEL_COPYAREA | FBINFO_MISC_ALWAYS_SETPAR; /* * There are many DisplayLink-based graphics products, all with unique PIDs. * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff) * We also require a match on SubClass (0x00) and Protocol (0x00), * which is compatible with all known USB 2.0 era graphics chips and firmware, * but allows DisplayLink to increment those for any future incompatible chips */ static const struct usb_device_id id_table[] = { {.idVendor = 0x17e9, .bInterfaceClass = 0xff, .bInterfaceSubClass = 0x00, .bInterfaceProtocol = 0x00, .match_flags = USB_DEVICE_ID_MATCH_VENDOR | USB_DEVICE_ID_MATCH_INT_CLASS | USB_DEVICE_ID_MATCH_INT_SUBCLASS | USB_DEVICE_ID_MATCH_INT_PROTOCOL, }, {}, }; MODULE_DEVICE_TABLE(usb, id_table); /* module options */ static bool console = true; /* Allow fbcon to open framebuffer */ static bool fb_defio = true; /* Detect mmap writes using page faults */ static bool shadow = true; /* Optionally disable shadow framebuffer */ static int pixel_limit; /* Optionally force a pixel resolution limit */ struct dlfb_deferred_free { struct list_head list; void *mem; }; static int dlfb_realloc_framebuffer(struct dlfb_data *dlfb, struct fb_info *info, u32 new_len); /* dlfb keeps a list of urbs for efficient bulk transfers */ static void dlfb_urb_completion(struct urb *urb); static struct urb *dlfb_get_urb(struct dlfb_data *dlfb); static int dlfb_submit_urb(struct dlfb_data *dlfb, struct urb * urb, size_t len); static int dlfb_alloc_urb_list(struct dlfb_data *dlfb, int count, size_t size); static void dlfb_free_urb_list(struct dlfb_data *dlfb); /* * All DisplayLink bulk operations start with 0xAF, followed by specific code * All operations are written to buffers which then later get sent to device */ static char *dlfb_set_register(char *buf, u8 reg, u8 val) { *buf++ = 0xAF; *buf++ = 0x20; *buf++ = reg; *buf++ = val; return buf; } static char *dlfb_vidreg_lock(char *buf) { return dlfb_set_register(buf, 0xFF, 0x00); } static char *dlfb_vidreg_unlock(char *buf) { return dlfb_set_register(buf, 0xFF, 0xFF); } /* * Map FB_BLANK_* to DisplayLink register * DLReg FB_BLANK_* * ----- ----------------------------- * 0x00 FB_BLANK_UNBLANK (0) * 0x01 FB_BLANK (1) * 0x03 FB_BLANK_VSYNC_SUSPEND (2) * 0x05 FB_BLANK_HSYNC_SUSPEND (3) * 0x07 FB_BLANK_POWERDOWN (4) Note: requires modeset to come back */ static char *dlfb_blanking(char *buf, int fb_blank) { u8 reg; switch (fb_blank) { case FB_BLANK_POWERDOWN: reg = 0x07; break; case FB_BLANK_HSYNC_SUSPEND: reg = 0x05; break; case FB_BLANK_VSYNC_SUSPEND: reg = 0x03; break; case FB_BLANK_NORMAL: reg = 0x01; break; default: reg = 0x00; } buf = dlfb_set_register(buf, 0x1F, reg); return buf; } static char *dlfb_set_color_depth(char *buf, u8 selection) { return dlfb_set_register(buf, 0x00, selection); } static char *dlfb_set_base16bpp(char *wrptr, u32 base) { /* the base pointer is 16 bits wide, 0x20 is hi byte. */ wrptr = dlfb_set_register(wrptr, 0x20, base >> 16); wrptr = dlfb_set_register(wrptr, 0x21, base >> 8); return dlfb_set_register(wrptr, 0x22, base); } /* * DisplayLink HW has separate 16bpp and 8bpp framebuffers. * In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer */ static char *dlfb_set_base8bpp(char *wrptr, u32 base) { wrptr = dlfb_set_register(wrptr, 0x26, base >> 16); wrptr = dlfb_set_register(wrptr, 0x27, base >> 8); return dlfb_set_register(wrptr, 0x28, base); } static char *dlfb_set_register_16(char *wrptr, u8 reg, u16 value) { wrptr = dlfb_set_register(wrptr, reg, value >> 8); return dlfb_set_register(wrptr, reg+1, value); } /* * This is kind of weird because the controller takes some * register values in a different byte order than other registers. */ static char *dlfb_set_register_16be(char *wrptr, u8 reg, u16 value) { wrptr = dlfb_set_register(wrptr, reg, value); return dlfb_set_register(wrptr, reg+1, value >> 8); } /* * LFSR is linear feedback shift register. The reason we have this is * because the display controller needs to minimize the clock depth of * various counters used in the display path. So this code reverses the * provided value into the lfsr16 value by counting backwards to get * the value that needs to be set in the hardware comparator to get the * same actual count. This makes sense once you read above a couple of * times and think about it from a hardware perspective. */ static u16 dlfb_lfsr16(u16 actual_count) { u32 lv = 0xFFFF; /* This is the lfsr value that the hw starts with */ while (actual_count--) { lv = ((lv << 1) | (((lv >> 15) ^ (lv >> 4) ^ (lv >> 2) ^ (lv >> 1)) & 1)) & 0xFFFF; } return (u16) lv; } /* * This does LFSR conversion on the value that is to be written. * See LFSR explanation above for more detail. */ static char *dlfb_set_register_lfsr16(char *wrptr, u8 reg, u16 value) { return dlfb_set_register_16(wrptr, reg, dlfb_lfsr16(value)); } /* * This takes a standard fbdev screeninfo struct and all of its monitor mode * details and converts them into the DisplayLink equivalent register commands. */ static char *dlfb_set_vid_cmds(char *wrptr, struct fb_var_screeninfo *var) { u16 xds, yds; u16 xde, yde; u16 yec; /* x display start */ xds = var->left_margin + var->hsync_len; wrptr = dlfb_set_register_lfsr16(wrptr, 0x01, xds); /* x display end */ xde = xds + var->xres; wrptr = dlfb_set_register_lfsr16(wrptr, 0x03, xde); /* y display start */ yds = var->upper_margin + var->vsync_len; wrptr = dlfb_set_register_lfsr16(wrptr, 0x05, yds); /* y display end */ yde = yds + var->yres; wrptr = dlfb_set_register_lfsr16(wrptr, 0x07, yde); /* x end count is active + blanking - 1 */ wrptr = dlfb_set_register_lfsr16(wrptr, 0x09, xde + var->right_margin - 1); /* libdlo hardcodes hsync start to 1 */ wrptr = dlfb_set_register_lfsr16(wrptr, 0x0B, 1); /* hsync end is width of sync pulse + 1 */ wrptr = dlfb_set_register_lfsr16(wrptr, 0x0D, var->hsync_len + 1); /* hpixels is active pixels */ wrptr = dlfb_set_register_16(wrptr, 0x0F, var->xres); /* yendcount is vertical active + vertical blanking */ yec = var->yres + var->upper_margin + var->lower_margin + var->vsync_len; wrptr = dlfb_set_register_lfsr16(wrptr, 0x11, yec); /* libdlo hardcodes vsync start to 0 */ wrptr = dlfb_set_register_lfsr16(wrptr, 0x13, 0); /* vsync end is width of vsync pulse */ wrptr = dlfb_set_register_lfsr16(wrptr, 0x15, var->vsync_len); /* vpixels is active pixels */ wrptr = dlfb_set_register_16(wrptr, 0x17, var->yres); /* convert picoseconds to 5kHz multiple for pclk5k = x * 1E12/5k */ wrptr = dlfb_set_register_16be(wrptr, 0x1B, 200*1000*1000/var->pixclock); return wrptr; } /* * This takes a standard fbdev screeninfo struct that was fetched or prepared * and then generates the appropriate command sequence that then drives the * display controller. */ static int dlfb_set_video_mode(struct dlfb_data *dlfb, struct fb_var_screeninfo *var) { char *buf; char *wrptr; int retval; int writesize; struct urb *urb; if (!atomic_read(&dlfb->usb_active)) return -EPERM; urb = dlfb_get_urb(dlfb); if (!urb) return -ENOMEM; buf = (char *) urb->transfer_buffer; /* * This first section has to do with setting the base address on the * controller * associated with the display. There are 2 base * pointers, currently, we only * use the 16 bpp segment. */ wrptr = dlfb_vidreg_lock(buf); wrptr = dlfb_set_color_depth(wrptr, 0x00); /* set base for 16bpp segment to 0 */ wrptr = dlfb_set_base16bpp(wrptr, 0); /* set base for 8bpp segment to end of fb */ wrptr = dlfb_set_base8bpp(wrptr, dlfb->info->fix.smem_len); wrptr = dlfb_set_vid_cmds(wrptr, var); wrptr = dlfb_blanking(wrptr, FB_BLANK_UNBLANK); wrptr = dlfb_vidreg_unlock(wrptr); writesize = wrptr - buf; retval = dlfb_submit_urb(dlfb, urb, writesize); dlfb->blank_mode = FB_BLANK_UNBLANK; return retval; } static int dlfb_ops_mmap(struct fb_info *info, struct vm_area_struct *vma) { unsigned long start = vma->vm_start; unsigned long size = vma->vm_end - vma->vm_start; unsigned long offset = vma->vm_pgoff << PAGE_SHIFT; unsigned long page, pos; if (info->fbdefio) return fb_deferred_io_mmap(info, vma); vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot); if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT)) return -EINVAL; if (size > info->fix.smem_len) return -EINVAL; if (offset > info->fix.smem_len - size) return -EINVAL; pos = (unsigned long)info->fix.smem_start + offset; dev_dbg(info->dev, "mmap() framebuffer addr:%lu size:%lu\n", pos, size); while (size > 0) { page = vmalloc_to_pfn((void *)pos); if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED)) return -EAGAIN; start += PAGE_SIZE; pos += PAGE_SIZE; if (size > PAGE_SIZE) size -= PAGE_SIZE; else size = 0; } return 0; } /* * Trims identical data from front and back of line * Sets new front buffer address and width * And returns byte count of identical pixels * Assumes CPU natural alignment (unsigned long) * for back and front buffer ptrs and width */ static int dlfb_trim_hline(const u8 *bback, const u8 **bfront, int *width_bytes) { int j, k; const unsigned long *back = (const unsigned long *) bback; const unsigned long *front = (const unsigned long *) *bfront; const int width = *width_bytes / sizeof(unsigned long); int identical; int start = width; int end = width; for (j = 0; j < width; j++) { if (back[j] != front[j]) { start = j; break; } } for (k = width - 1; k > j; k--) { if (back[k] != front[k]) { end = k+1; break; } } identical = start + (width - end); *bfront = (u8 *) &front[start]; *width_bytes = (end - start) * sizeof(unsigned long); return identical * sizeof(unsigned long); } /* * Render a command stream for an encoded horizontal line segment of pixels. * * A command buffer holds several commands. * It always begins with a fresh command header * (the protocol doesn't require this, but we enforce it to allow * multiple buffers to be potentially encoded and sent in parallel). * A single command encodes one contiguous horizontal line of pixels * * The function relies on the client to do all allocation, so that * rendering can be done directly to output buffers (e.g. USB URBs). * The function fills the supplied command buffer, providing information * on where it left off, so the client may call in again with additional * buffers if the line will take several buffers to complete. * * A single command can transmit a maximum of 256 pixels, * regardless of the compression ratio (protocol design limit). * To the hardware, 0 for a size byte means 256 * * Rather than 256 pixel commands which are either rl or raw encoded, * the rlx command simply assumes alternating raw and rl spans within one cmd. * This has a slightly larger header overhead, but produces more even results. * It also processes all data (read and write) in a single pass. * Performance benchmarks of common cases show it having just slightly better * compression than 256 pixel raw or rle commands, with similar CPU consumpion. * But for very rl friendly data, will compress not quite as well. */ static void dlfb_compress_hline( const uint16_t **pixel_start_ptr, const uint16_t *const pixel_end, uint32_t *device_address_ptr, uint8_t **command_buffer_ptr, const uint8_t *const cmd_buffer_end, unsigned long back_buffer_offset, int *ident_ptr) { const uint16_t *pixel = *pixel_start_ptr; uint32_t dev_addr = *device_address_ptr; uint8_t *cmd = *command_buffer_ptr; while ((pixel_end > pixel) && (cmd_buffer_end - MIN_RLX_CMD_BYTES > cmd)) { uint8_t *raw_pixels_count_byte = NULL; uint8_t *cmd_pixels_count_byte = NULL; const uint16_t *raw_pixel_start = NULL; const uint16_t *cmd_pixel_start, *cmd_pixel_end = NULL; if (back_buffer_offset && *pixel == *(u16 *)((u8 *)pixel + back_buffer_offset)) { pixel++; dev_addr += BPP; (*ident_ptr)++; continue; } *cmd++ = 0xAF; *cmd++ = 0x6B; *cmd++ = dev_addr >> 16; *cmd++ = dev_addr >> 8; *cmd++ = dev_addr; cmd_pixels_count_byte = cmd++; /* we'll know this later */ cmd_pixel_start = pixel; raw_pixels_count_byte = cmd++; /* we'll know this later */ raw_pixel_start = pixel; cmd_pixel_end = pixel + min3(MAX_CMD_PIXELS + 1UL, (unsigned long)(pixel_end - pixel), (unsigned long)(cmd_buffer_end - 1 - cmd) / BPP); if (back_buffer_offset) { /* note: the framebuffer may change under us, so we must test for underflow */ while (cmd_pixel_end - 1 > pixel && *(cmd_pixel_end - 1) == *(u16 *)((u8 *)(cmd_pixel_end - 1) + back_buffer_offset)) cmd_pixel_end--; } while (pixel < cmd_pixel_end) { const uint16_t * const repeating_pixel = pixel; u16 pixel_value = *pixel; put_unaligned_be16(pixel_value, cmd); if (back_buffer_offset) *(u16 *)((u8 *)pixel + back_buffer_offset) = pixel_value; cmd += 2; pixel++; if (unlikely((pixel < cmd_pixel_end) && (*pixel == pixel_value))) { /* go back and fill in raw pixel count */ *raw_pixels_count_byte = ((repeating_pixel - raw_pixel_start) + 1) & 0xFF; do { if (back_buffer_offset) *(u16 *)((u8 *)pixel + back_buffer_offset) = pixel_value; pixel++; } while ((pixel < cmd_pixel_end) && (*pixel == pixel_value)); /* immediately after raw data is repeat byte */ *cmd++ = ((pixel - repeating_pixel) - 1) & 0xFF; /* Then start another raw pixel span */ raw_pixel_start = pixel; raw_pixels_count_byte = cmd++; } } if (pixel > raw_pixel_start) { /* finalize last RAW span */ *raw_pixels_count_byte = (pixel-raw_pixel_start) & 0xFF; } else { /* undo unused byte */ cmd--; } *cmd_pixels_count_byte = (pixel - cmd_pixel_start) & 0xFF; dev_addr += (u8 *)pixel - (u8 *)cmd_pixel_start; } if (cmd_buffer_end - MIN_RLX_CMD_BYTES <= cmd) { /* Fill leftover bytes with no-ops */ if (cmd_buffer_end > cmd) memset(cmd, 0xAF, cmd_buffer_end - cmd); cmd = (uint8_t *) cmd_buffer_end; } *command_buffer_ptr = cmd; *pixel_start_ptr = pixel; *device_address_ptr = dev_addr; } /* * There are 3 copies of every pixel: The front buffer that the fbdev * client renders to, the actual framebuffer across the USB bus in hardware * (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 int dlfb_render_hline(struct dlfb_data *dlfb, struct urb **urb_ptr, const char *front, char **urb_buf_ptr, u32 byte_offset, u32 byte_width, int *ident_ptr, int *sent_ptr) { const u8 *line_start, *line_end, *next_pixel; u32 dev_addr = dlfb->base16 + byte_offset; struct urb *urb = *urb_ptr; u8 *cmd = *urb_buf_ptr; u8 *cmd_end = (u8 *) urb->transfer_buffer + urb->transfer_buffer_length; unsigned long back_buffer_offset = 0; line_start = (u8 *) (front + byte_offset); next_pixel = line_start; line_end = next_pixel + byte_width; if (dlfb->backing_buffer) { int offset; const u8 *back_start = (u8 *) (dlfb->backing_buffer + byte_offset); back_buffer_offset = (unsigned long)back_start - (unsigned long)line_start; *ident_ptr += dlfb_trim_hline(back_start, &next_pixel, &byte_width); offset = next_pixel - line_start; line_end = next_pixel + byte_width; dev_addr += offset; back_start += offset; line_start += offset; } while (next_pixel < line_end) { dlfb_compress_hline((const uint16_t **) &next_pixel, (const uint16_t *) line_end, &dev_addr, (u8 **) &cmd, (u8 *) cmd_end, back_buffer_offset, ident_ptr); if (cmd >= cmd_end) { int len = cmd - (u8 *) urb->transfer_buffer; if (dlfb_submit_urb(dlfb, urb, len)) return 1; /* lost pixels is set */ *sent_ptr += len; urb = dlfb_get_urb(dlfb); if (!urb) return 1; /* lost_pixels is set */ *urb_ptr = urb; cmd = urb->transfer_buffer; cmd_end = &cmd[urb->transfer_buffer_length]; } } *urb_buf_ptr = cmd; return 0; } static int dlfb_handle_damage(struct dlfb_data *dlfb, int x, int y, int width, int height) { int i, ret; char *cmd; cycles_t start_cycles, end_cycles; int bytes_sent = 0; int bytes_identical = 0; struct urb *urb; int aligned_x; start_cycles = get_cycles(); mutex_lock(&dlfb->render_mutex); aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long)); width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long)); x = aligned_x; if ((width <= 0) || (x + width > dlfb->info->var.xres) || (y + height > dlfb->info->var.yres)) { ret = -EINVAL; goto unlock_ret; } if (!atomic_read(&dlfb->usb_active)) { ret = 0; goto unlock_ret; } urb = dlfb_get_urb(dlfb); if (!urb) { ret = 0; goto unlock_ret; } cmd = urb->transfer_buffer; for (i = y; i < y + height ; i++) { const int line_offset = dlfb->info->fix.line_length * i; const int byte_offset = line_offset + (x * BPP); if (dlfb_render_hline(dlfb, &urb, (char *) dlfb->info->fix.smem_start, &cmd, byte_offset, width * BPP, &bytes_identical, &bytes_sent)) goto error; } if (cmd > (char *) urb->transfer_buffer) { int len; if (cmd < (char *) urb->transfer_buffer + urb->transfer_buffer_length) *cmd++ = 0xAF; /* Send partial buffer remaining before exiting */ len = cmd - (char *) urb->transfer_buffer; dlfb_submit_urb(dlfb, urb, len); bytes_sent += len; } else dlfb_urb_completion(urb); error: atomic_add(bytes_sent, &dlfb->bytes_sent); atomic_add(bytes_identical, &dlfb->bytes_identical); atomic_add(width*height*2, &dlfb->bytes_rendered); end_cycles = get_cycles(); atomic_add(((unsigned int) ((end_cycles - start_cycles) >> 10)), /* Kcycles */ &dlfb->cpu_kcycles_used); ret = 0; unlock_ret: mutex_unlock(&dlfb->render_mutex); return ret; } static void dlfb_init_damage(struct dlfb_data *dlfb) { dlfb->damage_x = INT_MAX; dlfb->damage_x2 = 0; dlfb->damage_y = INT_MAX; dlfb->damage_y2 = 0; } static void dlfb_damage_work(struct work_struct *w) { struct dlfb_data *dlfb = container_of(w, struct dlfb_data, damage_work); int x, x2, y, y2; spin_lock_irq(&dlfb->damage_lock); x = dlfb->damage_x; x2 = dlfb->damage_x2; y = dlfb->damage_y; y2 = dlfb->damage_y2; dlfb_init_damage(dlfb); spin_unlock_irq(&dlfb->damage_lock); if (x < x2 && y < y2) dlfb_handle_damage(dlfb, x, y, x2 - x, y2 - y); } static void dlfb_offload_damage(struct dlfb_data *dlfb, int x, int y, int width, int height) { unsigned long flags; int x2 = x + width; int y2 = y + height; if (x >= x2 || y >= y2) return; spin_lock_irqsave(&dlfb->damage_lock, flags); dlfb->damage_x = min(x, dlfb->damage_x); dlfb->damage_x2 = max(x2, dlfb->damage_x2); dlfb->damage_y = min(y, dlfb->damage_y); dlfb->damage_y2 = max(y2, dlfb->damage_y2); spin_unlock_irqrestore(&dlfb->damage_lock, flags); schedule_work(&dlfb->damage_work); } /* * NOTE: fb_defio.c is holding info->fbdefio.mutex * Touching ANY framebuffer memory that triggers a page fault * in fb_defio will cause a deadlock, when it also tries to * grab the same mutex. */ static void dlfb_dpy_deferred_io(struct fb_info *info, struct list_head *pagereflist) { struct fb_deferred_io_pageref *pageref; struct dlfb_data *dlfb = info->par; struct urb *urb; char *cmd; cycles_t start_cycles, end_cycles; int bytes_sent = 0; int bytes_identical = 0; int bytes_rendered = 0; mutex_lock(&dlfb->render_mutex); if (!fb_defio) goto unlock_ret; if (!atomic_read(&dlfb->usb_active)) goto unlock_ret; start_cycles = get_cycles(); urb = dlfb_get_urb(dlfb); if (!urb) goto unlock_ret; cmd = urb->transfer_buffer; /* walk the written page list and render each to device */ list_for_each_entry(pageref, pagereflist, list) { if (dlfb_render_hline(dlfb, &urb, (char *) info->fix.smem_start, &cmd, pageref->offset, PAGE_SIZE, &bytes_identical, &bytes_sent)) goto error; bytes_rendered += PAGE_SIZE; } if (cmd > (char *) urb->transfer_buffer) { int len; if (cmd < (char *) urb->transfer_buffer + urb->transfer_buffer_length) *cmd++ = 0xAF; /* Send partial buffer remaining before exiting */ len = cmd - (char *) urb->transfer_buffer; dlfb_submit_urb(dlfb, urb, len); bytes_sent += len; } else dlfb_urb_completion(urb); error: atomic_add(bytes_sent, &dlfb->bytes_sent); atomic_add(bytes_identical, &dlfb->bytes_identical); atomic_add(bytes_rendered, &dlfb->bytes_rendered); end_cycles = get_cycles(); atomic_add(((unsigned int) ((end_cycles - start_cycles) >> 10)), /* Kcycles */ &dlfb->cpu_kcycles_used); unlock_ret: mutex_unlock(&dlfb->render_mutex); } static int dlfb_get_edid(struct dlfb_data *dlfb, char *edid, int len) { int i, ret; char *rbuf; rbuf = kmalloc(2, GFP_KERNEL); if (!rbuf) return 0; for (i = 0; i < len; i++) { ret = usb_control_msg(dlfb->udev, usb_rcvctrlpipe(dlfb->udev, 0), 0x02, (0x80 | (0x02 << 5)), i << 8, 0xA1, rbuf, 2, USB_CTRL_GET_TIMEOUT); if (ret < 2) { dev_err(&dlfb->udev->dev, "Read EDID byte %d failed: %d\n", i, ret); i--; break; } edid[i] = rbuf[1]; } kfree(rbuf); return i; } static int dlfb_ops_ioctl(struct fb_info *info, unsigned int cmd, unsigned long arg) { struct dlfb_data *dlfb = info->par; if (!atomic_read(&dlfb->usb_active)) return 0; /* TODO: Update X server to get this from sysfs instead */ if (cmd == DLFB_IOCTL_RETURN_EDID) { void __user *edid = (void __user *)arg; if (copy_to_user(edid, dlfb->edid, dlfb->edid_size)) return -EFAULT; return 0; } /* TODO: Help propose a standard fb.h ioctl to report mmap damage */ if (cmd == DLFB_IOCTL_REPORT_DAMAGE) { struct dloarea area; if (copy_from_user(&area, (void __user *)arg, sizeof(struct dloarea))) return -EFAULT; /* * If we have a damage-aware client, turn fb_defio "off" * To avoid perf imact of unnecessary 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; if (area.x < 0) area.x = 0; if (area.x > info->var.xres) area.x = info->var.xres; if (area.y < 0) area.y = 0; if (area.y > info->var.yres) area.y = info->var.yres; dlfb_handle_damage(dlfb, area.x, area.y, area.w, area.h); } return 0; } /* taken from vesafb */ static int dlfb_ops_setcolreg(unsigned regno, unsigned red, unsigned green, unsigned blue, unsigned transp, struct fb_info *info) { int err = 0; if (regno >= info->cmap.len) return 1; if (regno < 16) { if (info->var.red.offset == 10) { /* 1:5:5:5 */ ((u32 *) (info->pseudo_palette))[regno] = ((red & 0xf800) >> 1) | ((green & 0xf800) >> 6) | ((blue & 0xf800) >> 11); } else { /* 0:5:6:5 */ ((u32 *) (info->pseudo_palette))[regno] = ((red & 0xf800)) | ((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11); } } return err; } /* * It's common for several clients to have framebuffer open simultaneously. * e.g. both fbcon and X. Makes things interesting. * Assumes caller is holding info->lock (for open and release at least) */ static int dlfb_ops_open(struct fb_info *info, int user) { struct dlfb_data *dlfb = info->par; /* * fbcon aggressively connects to first framebuffer it finds, * preventing other clients (X) from working properly. Usually * not what the user wants. Fail by default with option to enable. */ if ((user == 0) && (!console)) return -EBUSY; /* If the USB device is gone, we don't accept new opens */ if (dlfb->virtualized) return -ENODEV; dlfb->fb_count++; if (fb_defio && (info->fbdefio == NULL)) { /* enable defio at last moment if not disabled by client */ struct fb_deferred_io *fbdefio; fbdefio = kzalloc(sizeof(struct fb_deferred_io), GFP_KERNEL); if (fbdefio) { fbdefio->delay = DL_DEFIO_WRITE_DELAY; fbdefio->sort_pagereflist = true; fbdefio->deferred_io = dlfb_dpy_deferred_io; } info->fbdefio = fbdefio; fb_deferred_io_init(info); } dev_dbg(info->dev, "open, user=%d fb_info=%p count=%d\n", user, info, dlfb->fb_count); return 0; } static void dlfb_ops_destroy(struct fb_info *info) { struct dlfb_data *dlfb = info->par; cancel_work_sync(&dlfb->damage_work); mutex_destroy(&dlfb->render_mutex); if (info->cmap.len != 0) fb_dealloc_cmap(&info->cmap); if (info->monspecs.modedb) fb_destroy_modedb(info->monspecs.modedb); vfree(info->screen_buffer); fb_destroy_modelist(&info->modelist); while (!list_empty(&dlfb->deferred_free)) { struct dlfb_deferred_free *d = list_entry(dlfb->deferred_free.next, struct dlfb_deferred_free, list); list_del(&d->list); vfree(d->mem); kfree(d); } vfree(dlfb->backing_buffer); kfree(dlfb->edid); dlfb_free_urb_list(dlfb); usb_put_dev(dlfb->udev); kfree(dlfb); /* Assume info structure is freed after this point */ framebuffer_release(info); } /* * Assumes caller is holding info->lock mutex (for open and release at least) */ static int dlfb_ops_release(struct fb_info *info, int user) { struct dlfb_data *dlfb = info->par; dlfb->fb_count--; if ((dlfb->fb_count == 0) && (info->fbdefio)) { fb_deferred_io_cleanup(info); kfree(info->fbdefio); info->fbdefio = NULL; } dev_dbg(info->dev, "release, user=%d count=%d\n", user, dlfb->fb_count); return 0; } /* * Check whether a video mode is supported by the DisplayLink chip * We start from monitor's modes, so don't need to filter that here */ static int dlfb_is_valid_mode(struct fb_videomode *mode, struct dlfb_data *dlfb) { if (mode->xres * mode->yres > dlfb->sku_pixel_limit) return 0; return 1; } static void dlfb_var_color_format(struct fb_var_screeninfo *var) { const struct fb_bitfield red = { 11, 5, 0 }; const struct fb_bitfield green = { 5, 6, 0 }; const struct fb_bitfield blue = { 0, 5, 0 }; var->bits_per_pixel = 16; var->red = red; var->green = green; var->blue = blue; } static int dlfb_ops_check_var(struct fb_var_screeninfo *var, struct fb_info *info) { struct fb_videomode mode; struct dlfb_data *dlfb = info->par; /* set device-specific elements of var unrelated to mode */ dlfb_var_color_format(var); fb_var_to_videomode(&mode, var); if (!dlfb_is_valid_mode(&mode, dlfb)) return -EINVAL; return 0; } static int dlfb_ops_set_par(struct fb_info *info) { struct dlfb_data *dlfb = info->par; int result; u16 *pix_framebuffer; int i; struct fb_var_screeninfo fvs; u32 line_length = info->var.xres * (info->var.bits_per_pixel / 8); /* clear the activate field because it causes spurious miscompares */ fvs = info->var; fvs.activate = 0; fvs.vmode &= ~FB_VMODE_SMOOTH_XPAN; if (!memcmp(&dlfb->current_mode, &fvs, sizeof(struct fb_var_screeninfo))) return 0; result = dlfb_realloc_framebuffer(dlfb, info, info->var.yres * line_length); if (result) return result; result = dlfb_set_video_mode(dlfb, &info->var); if (result) return result; dlfb->current_mode = fvs; info->fix.line_length = line_length; if (dlfb->fb_count == 0) { /* paint greenscreen */ pix_framebuffer = (u16 *)info->screen_buffer; for (i = 0; i < info->fix.smem_len / 2; i++) pix_framebuffer[i] = 0x37e6; } dlfb_handle_damage(dlfb, 0, 0, info->var.xres, info->var.yres); return 0; } /* To fonzi the jukebox (e.g. make blanking changes take effect) */ static char *dlfb_dummy_render(char *buf) { *buf++ = 0xAF; *buf++ = 0x6A; /* copy */ *buf++ = 0x00; /* from address*/ *buf++ = 0x00; *buf++ = 0x00; *buf++ = 0x01; /* one pixel */ *buf++ = 0x00; /* to address */ *buf++ = 0x00; *buf++ = 0x00; return buf; } /* * In order to come back from full DPMS off, we need to set the mode again */ static int dlfb_ops_blank(int blank_mode, struct fb_info *info) { struct dlfb_data *dlfb = info->par; char *bufptr; struct urb *urb; dev_dbg(info->dev, "blank, mode %d --> %d\n", dlfb->blank_mode, blank_mode); if ((dlfb->blank_mode == FB_BLANK_POWERDOWN) && (blank_mode != FB_BLANK_POWERDOWN)) { /* returning from powerdown requires a fresh modeset */ dlfb_set_video_mode(dlfb, &info->var); } urb = dlfb_get_urb(dlfb); if (!urb) return 0; bufptr = (char *) urb->transfer_buffer; bufptr = dlfb_vidreg_lock(bufptr); bufptr = dlfb_blanking(bufptr, blank_mode); bufptr = dlfb_vidreg_unlock(bufptr); /* seems like a render op is needed to have blank change take effect */ bufptr = dlfb_dummy_render(bufptr); dlfb_submit_urb(dlfb, urb, bufptr - (char *) urb->transfer_buffer); dlfb->blank_mode = blank_mode; return 0; } static void dlfb_ops_damage_range(struct fb_info *info, off_t off, size_t len) { struct dlfb_data *dlfb = info->par; int start = max((int)(off / info->fix.line_length), 0); int lines = min((u32)((len / info->fix.line_length) + 1), (u32)info->var.yres); dlfb_handle_damage(dlfb, 0, start, info->var.xres, lines); } static void dlfb_ops_damage_area(struct fb_info *info, u32 x, u32 y, u32 width, u32 height) { struct dlfb_data *dlfb = info->par; dlfb_offload_damage(dlfb, x, y, width, height); } FB_GEN_DEFAULT_DEFERRED_SYSMEM_OPS(dlfb_ops, dlfb_ops_damage_range, dlfb_ops_damage_area) static const struct fb_ops dlfb_ops = { .owner = THIS_MODULE, __FB_DEFAULT_DEFERRED_OPS_RDWR(dlfb_ops), .fb_setcolreg = dlfb_ops_setcolreg, __FB_DEFAULT_DEFERRED_OPS_DRAW(dlfb_ops), .fb_mmap = dlfb_ops_mmap, .fb_ioctl = dlfb_ops_ioctl, .fb_open = dlfb_ops_open, .fb_release = dlfb_ops_release, .fb_blank = dlfb_ops_blank, .fb_check_var = dlfb_ops_check_var, .fb_set_par = dlfb_ops_set_par, .fb_destroy = dlfb_ops_destroy, }; static void dlfb_deferred_vfree(struct dlfb_data *dlfb, void *mem) { struct dlfb_deferred_free *d = kmalloc(sizeof(struct dlfb_deferred_free), GFP_KERNEL); if (!d) return; d->mem = mem; list_add(&d->list, &dlfb->deferred_free); } /* * Assumes &info->lock held by caller * Assumes no active clients have framebuffer open */ static int dlfb_realloc_framebuffer(struct dlfb_data *dlfb, struct fb_info *info, u32 new_len) { u32 old_len = info->fix.smem_len; const void *old_fb = info->screen_buffer; unsigned char *new_fb; unsigned char *new_back = NULL; new_len = PAGE_ALIGN(new_len); if (new_len > old_len) { /* * Alloc system memory for virtual framebuffer */ new_fb = vmalloc(new_len); if (!new_fb) { dev_err(info->dev, "Virtual framebuffer alloc failed\n"); return -ENOMEM; } memset(new_fb, 0xff, new_len); if (info->screen_buffer) { memcpy(new_fb, old_fb, old_len); dlfb_deferred_vfree(dlfb, info->screen_buffer); } info->screen_buffer = new_fb; info->fix.smem_len = new_len; info->fix.smem_start = (unsigned long) new_fb; info->flags = udlfb_info_flags; /* * Second framebuffer copy to mirror the framebuffer state * on the physical USB device. We can function without this. * But with imperfect damage info we may send pixels over USB * that were, in fact, unchanged - wasting limited USB bandwidth */ if (shadow) new_back = vzalloc(new_len); if (!new_back) dev_info(info->dev, "No shadow/backing buffer allocated\n"); else { dlfb_deferred_vfree(dlfb, dlfb->backing_buffer); dlfb->backing_buffer = new_back; } } return 0; } /* * 1) Get EDID from hw, or use sw default * 2) Parse into various fb_info structs * 3) Allocate virtual framebuffer memory to back highest res mode * * Parses EDID into three places used by various parts of fbdev: * fb_var_screeninfo contains the timing of the monitor's preferred mode * fb_info.monspecs is full parsed EDID info, including monspecs.modedb * fb_info.modelist is a linked list of all monitor & VESA modes which work * * If EDID is not readable/valid, then modelist is all VESA modes, * monspecs is NULL, and fb_var_screeninfo is set to safe VESA mode * Returns 0 if successful */ static int dlfb_setup_modes(struct dlfb_data *dlfb, struct fb_info *info, char *default_edid, size_t default_edid_size) { char *edid; int i, result = 0, tries = 3; struct device *dev = info->device; struct fb_videomode *mode; const struct fb_videomode *default_vmode = NULL; if (info->dev) { /* only use mutex if info has been registered */ mutex_lock(&info->lock); /* parent device is used otherwise */ dev = info->dev; } edid = kmalloc(EDID_LENGTH, GFP_KERNEL); if (!edid) { result = -ENOMEM; goto error; } fb_destroy_modelist(&info->modelist); memset(&info->monspecs, 0, sizeof(info->monspecs)); /* * Try to (re)read EDID from hardware first * EDID data may return, but not parse as valid * Try again a few times, in case of e.g. analog cable noise */ while (tries--) { i = dlfb_get_edid(dlfb, edid, EDID_LENGTH); if (i >= EDID_LENGTH) fb_edid_to_monspecs(edid, &info->monspecs); if (info->monspecs.modedb_len > 0) { dlfb->edid = edid; dlfb->edid_size = i; break; } } /* If that fails, use a previously returned EDID if available */ if (info->monspecs.modedb_len == 0) { dev_err(dev, "Unable to get valid EDID from device/display\n"); if (dlfb->edid) { fb_edid_to_monspecs(dlfb->edid, &info->monspecs); if (info->monspecs.modedb_len > 0) dev_err(dev, "Using previously queried EDID\n"); } } /* If that fails, use the default EDID we were handed */ if (info->monspecs.modedb_len == 0) { if (default_edid_size >= EDID_LENGTH) { fb_edid_to_monspecs(default_edid, &info->monspecs); if (info->monspecs.modedb_len > 0) { memcpy(edid, default_edid, default_edid_size); dlfb->edid = edid; dlfb->edid_size = default_edid_size; dev_err(dev, "Using default/backup EDID\n"); } } } /* If we've got modes, let's pick a best default mode */ if (info->monspecs.modedb_len > 0) { for (i = 0; i < info->monspecs.modedb_len; i++) { mode = &info->monspecs.modedb[i]; if (dlfb_is_valid_mode(mode, dlfb)) { fb_add_videomode(mode, &info->modelist); } else { dev_dbg(dev, "Specified mode %dx%d too big\n", mode->xres, mode->yres); if (i == 0) /* if we've removed top/best mode */ info->monspecs.misc &= ~FB_MISC_1ST_DETAIL; } } default_vmode = fb_find_best_display(&info->monspecs, &info->modelist); } /* If everything else has failed, fall back to safe default mode */ if (default_vmode == NULL) { struct fb_videomode fb_vmode = {0}; /* * Add the standard VESA modes to our modelist * Since we don't have EDID, there may be modes that * overspec monitor and/or are incorrect aspect ratio, etc. * But at least the user has a chance to choose */ for (i = 0; i < VESA_MODEDB_SIZE; i++) { mode = (struct fb_videomode *)&vesa_modes[i]; if (dlfb_is_valid_mode(mode, dlfb)) fb_add_videomode(mode, &info->modelist); else dev_dbg(dev, "VESA mode %dx%d too big\n", mode->xres, mode->yres); } /* * default to resolution safe for projectors * (since they are most common case without EDID) */ fb_vmode.xres = 800; fb_vmode.yres = 600; fb_vmode.refresh = 60; default_vmode = fb_find_nearest_mode(&fb_vmode, &info->modelist); } /* If we have good mode and no active clients*/ if ((default_vmode != NULL) && (dlfb->fb_count == 0)) { fb_videomode_to_var(&info->var, default_vmode); dlfb_var_color_format(&info->var); /* * with mode size info, we can now alloc our framebuffer. */ memcpy(&info->fix, &dlfb_fix, sizeof(dlfb_fix)); } else result = -EINVAL; error: if (edid && (dlfb->edid != edid)) kfree(edid); if (info->dev) mutex_unlock(&info->lock); return result; } static ssize_t metrics_bytes_rendered_show(struct device *fbdev, struct device_attribute *a, char *buf) { struct fb_info *fb_info = dev_get_drvdata(fbdev); struct dlfb_data *dlfb = fb_info->par; return sysfs_emit(buf, "%u\n", atomic_read(&dlfb->bytes_rendered)); } static ssize_t metrics_bytes_identical_show(struct device *fbdev, struct device_attribute *a, char *buf) { struct fb_info *fb_info = dev_get_drvdata(fbdev); struct dlfb_data *dlfb = fb_info->par; return sysfs_emit(buf, "%u\n", atomic_read(&dlfb->bytes_identical)); } static ssize_t metrics_bytes_sent_show(struct device *fbdev, struct device_attribute *a, char *buf) { struct fb_info *fb_info = dev_get_drvdata(fbdev); struct dlfb_data *dlfb = fb_info->par; return sysfs_emit(buf, "%u\n", atomic_read(&dlfb->bytes_sent)); } static ssize_t metrics_cpu_kcycles_used_show(struct device *fbdev, struct device_attribute *a, char *buf) { struct fb_info *fb_info = dev_get_drvdata(fbdev); struct dlfb_data *dlfb = fb_info->par; return sysfs_emit(buf, "%u\n", atomic_read(&dlfb->cpu_kcycles_used)); } static ssize_t edid_show( struct file *filp, struct kobject *kobj, struct bin_attribute *a, char *buf, loff_t off, size_t count) { struct device *fbdev = kobj_to_dev(kobj); struct fb_info *fb_info = dev_get_drvdata(fbdev); struct dlfb_data *dlfb = fb_info->par; if (dlfb->edid == NULL) return 0; if ((off >= dlfb->edid_size) || (count > dlfb->edid_size)) return 0; if (off + count > dlfb->edid_size) count = dlfb->edid_size - off; memcpy(buf, dlfb->edid, count); return count; } static ssize_t edid_store( struct file *filp, struct kobject *kobj, struct bin_attribute *a, char *src, loff_t src_off, size_t src_size) { struct device *fbdev = kobj_to_dev(kobj); struct fb_info *fb_info = dev_get_drvdata(fbdev); struct dlfb_data *dlfb = fb_info->par; int ret; /* We only support write of entire EDID at once, no offset*/ if ((src_size != EDID_LENGTH) || (src_off != 0)) return -EINVAL; ret = dlfb_setup_modes(dlfb, fb_info, src, src_size); if (ret) return ret; if (!dlfb->edid || memcmp(src, dlfb->edid, src_size)) return -EINVAL; ret = dlfb_ops_set_par(fb_info); if (ret) return ret; return src_size; } static ssize_t metrics_reset_store(struct device *fbdev, struct device_attribute *attr, const char *buf, size_t count) { struct fb_info *fb_info = dev_get_drvdata(fbdev); struct dlfb_data *dlfb = fb_info->par; atomic_set(&dlfb->bytes_rendered, 0); atomic_set(&dlfb->bytes_identical, 0); atomic_set(&dlfb->bytes_sent, 0); atomic_set(&dlfb->cpu_kcycles_used, 0); return count; } static const struct bin_attribute edid_attr = { .attr.name = "edid", .attr.mode = 0666, .size = EDID_LENGTH, .read = edid_show, .write = edid_store }; static const struct device_attribute fb_device_attrs[] = { __ATTR_RO(metrics_bytes_rendered), __ATTR_RO(metrics_bytes_identical), __ATTR_RO(metrics_bytes_sent), __ATTR_RO(metrics_cpu_kcycles_used), __ATTR(metrics_reset, S_IWUSR, NULL, metrics_reset_store), }; /* * This is necessary before we can communicate with the display controller. */ static int dlfb_select_std_channel(struct dlfb_data *dlfb) { int ret; static const u8 set_def_chn[] = { 0x57, 0xCD, 0xDC, 0xA7, 0x1C, 0x88, 0x5E, 0x15, 0x60, 0xFE, 0xC6, 0x97, 0x16, 0x3D, 0x47, 0xF2 }; ret = usb_control_msg_send(dlfb->udev, 0, NR_USB_REQUEST_CHANNEL, (USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0, &set_def_chn, sizeof(set_def_chn), USB_CTRL_SET_TIMEOUT, GFP_KERNEL); return ret; } static int dlfb_parse_vendor_descriptor(struct dlfb_data *dlfb, struct usb_interface *intf) { char *desc; char *buf; char *desc_end; int total_len; buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL); if (!buf) return false; desc = buf; total_len = usb_get_descriptor(interface_to_usbdev(intf), 0x5f, /* vendor specific */ 0, desc, MAX_VENDOR_DESCRIPTOR_SIZE); /* if not found, look in configuration descriptor */ if (total_len < 0) { if (0 == usb_get_extra_descriptor(intf->cur_altsetting, 0x5f, &desc)) total_len = (int) desc[0]; } if (total_len > 5) { dev_info(&intf->dev, "vendor descriptor length: %d data: %11ph\n", total_len, desc); if ((desc[0] != total_len) || /* descriptor length */ (desc[1] != 0x5f) || /* vendor descriptor type */ (desc[2] != 0x01) || /* version (2 bytes) */ (desc[3] != 0x00) || (desc[4] != total_len - 2)) /* length after type */ goto unrecognized; desc_end = desc + total_len; desc += 5; /* the fixed header we've already parsed */ while (desc < desc_end) { u8 length; u16 key; key = *desc++; key |= (u16)*desc++ << 8; length = *desc++; switch (key) { case 0x0200: { /* max_area */ u32 max_area = *desc++; max_area |= (u32)*desc++ << 8; max_area |= (u32)*desc++ << 16; max_area |= (u32)*desc++ << 24; dev_warn(&intf->dev, "DL chip limited to %d pixel modes\n", max_area); dlfb->sku_pixel_limit = max_area; break; } default: break; } desc += length; } } else { dev_info(&intf->dev, "vendor descriptor not available (%d)\n", total_len); } goto success; unrecognized: /* allow udlfb to load for now even if firmware unrecognized */ dev_err(&intf->dev, "Unrecognized vendor firmware descriptor\n"); success: kfree(buf); return true; } static int dlfb_usb_probe(struct usb_interface *intf, const struct usb_device_id *id) { int i; const struct device_attribute *attr; struct dlfb_data *dlfb; struct fb_info *info; int retval; struct usb_device *usbdev = interface_to_usbdev(intf); static u8 out_ep[] = {OUT_EP_NUM + USB_DIR_OUT, 0}; /* usb initialization */ dlfb = kzalloc(sizeof(*dlfb), GFP_KERNEL); if (!dlfb) { dev_err(&intf->dev, "%s: failed to allocate dlfb\n", __func__); return -ENOMEM; } INIT_LIST_HEAD(&dlfb->deferred_free); dlfb->udev = usb_get_dev(usbdev); usb_set_intfdata(intf, dlfb); if (!usb_check_bulk_endpoints(intf, out_ep)) { dev_err(&intf->dev, "Invalid DisplayLink device!\n"); retval = -EINVAL; goto error; } dev_dbg(&intf->dev, "console enable=%d\n", console); dev_dbg(&intf->dev, "fb_defio enable=%d\n", fb_defio); dev_dbg(&intf->dev, "shadow enable=%d\n", shadow); dlfb->sku_pixel_limit = 2048 * 1152; /* default to maximum */ if (!dlfb_parse_vendor_descriptor(dlfb, intf)) { dev_err(&intf->dev, "firmware not recognized, incompatible device?\n"); retval = -ENODEV; goto error; } if (pixel_limit) { dev_warn(&intf->dev, "DL chip limit of %d overridden to %d\n", dlfb->sku_pixel_limit, pixel_limit); dlfb->sku_pixel_limit = pixel_limit; } /* allocates framebuffer driver structure, not framebuffer memory */ info = framebuffer_alloc(0, &dlfb->udev->dev); if (!info) { retval = -ENOMEM; goto error; } dlfb->info = info; info->par = dlfb; info->pseudo_palette = dlfb->pseudo_palette; dlfb->ops = dlfb_ops; info->fbops = &dlfb->ops; mutex_init(&dlfb->render_mutex); dlfb_init_damage(dlfb); spin_lock_init(&dlfb->damage_lock); INIT_WORK(&dlfb->damage_work, dlfb_damage_work); INIT_LIST_HEAD(&info->modelist); if (!dlfb_alloc_urb_list(dlfb, WRITES_IN_FLIGHT, MAX_TRANSFER)) { retval = -ENOMEM; dev_err(&intf->dev, "unable to allocate urb list\n"); goto error; } /* We don't register a new USB class. Our client interface is dlfbev */ retval = fb_alloc_cmap(&info->cmap, 256, 0); if (retval < 0) { dev_err(info->device, "cmap allocation failed: %d\n", retval); goto error; } retval = dlfb_setup_modes(dlfb, info, NULL, 0); if (retval != 0) { dev_err(info->device, "unable to find common mode for display and adapter\n"); goto error; } /* ready to begin using device */ atomic_set(&dlfb->usb_active, 1); dlfb_select_std_channel(dlfb); dlfb_ops_check_var(&info->var, info); retval = dlfb_ops_set_par(info); if (retval) goto error; retval = register_framebuffer(info); if (retval < 0) { dev_err(info->device, "unable to register framebuffer: %d\n", retval); goto error; } for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) { attr = &fb_device_attrs[i]; retval = device_create_file(info->dev, attr); if (retval) dev_warn(info->device, "failed to create '%s' attribute: %d\n", attr->attr.name, retval); } retval = device_create_bin_file(info->dev, &edid_attr); if (retval) dev_warn(info->device, "failed to create '%s' attribute: %d\n", edid_attr.attr.name, retval); dev_info(info->device, "%s is DisplayLink USB device (%dx%d, %dK framebuffer memory)\n", dev_name(info->dev), info->var.xres, info->var.yres, ((dlfb->backing_buffer) ? info->fix.smem_len * 2 : info->fix.smem_len) >> 10); return 0; error: if (dlfb->info) { dlfb_ops_destroy(dlfb->info); } else { usb_put_dev(dlfb->udev); kfree(dlfb); } return retval; } static void dlfb_usb_disconnect(struct usb_interface *intf) { struct dlfb_data *dlfb; struct fb_info *info; int i; dlfb = usb_get_intfdata(intf); info = dlfb->info; dev_dbg(&intf->dev, "USB disconnect starting\n"); /* we virtualize until all fb clients release. Then we free */ dlfb->virtualized = true; /* When non-active we'll update virtual framebuffer, but no new urbs */ atomic_set(&dlfb->usb_active, 0); /* this function will wait for all in-flight urbs to complete */ dlfb_free_urb_list(dlfb); /* remove udlfb's sysfs interfaces */ for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) device_remove_file(info->dev, &fb_device_attrs[i]); device_remove_bin_file(info->dev, &edid_attr); unregister_framebuffer(info); } static struct usb_driver dlfb_driver = { .name = "udlfb", .probe = dlfb_usb_probe, .disconnect = dlfb_usb_disconnect, .id_table = id_table, }; module_usb_driver(dlfb_driver); static void dlfb_urb_completion(struct urb *urb) { struct urb_node *unode = urb->context; struct dlfb_data *dlfb = unode->dlfb; unsigned long flags; switch (urb->status) { case 0: /* success */ break; case -ECONNRESET: case -ENOENT: case -ESHUTDOWN: /* sync/async unlink faults aren't errors */ break; default: dev_err(&dlfb->udev->dev, "%s - nonzero write bulk status received: %d\n", __func__, urb->status); atomic_set(&dlfb->lost_pixels, 1); break; } urb->transfer_buffer_length = dlfb->urbs.size; /* reset to actual */ spin_lock_irqsave(&dlfb->urbs.lock, flags); list_add_tail(&unode->entry, &dlfb->urbs.list); dlfb->urbs.available++; spin_unlock_irqrestore(&dlfb->urbs.lock, flags); up(&dlfb->urbs.limit_sem); } static void dlfb_free_urb_list(struct dlfb_data *dlfb) { int count = dlfb->urbs.count; struct list_head *node; struct urb_node *unode; struct urb *urb; /* keep waiting and freeing, until we've got 'em all */ while (count--) { down(&dlfb->urbs.limit_sem); spin_lock_irq(&dlfb->urbs.lock); node = dlfb->urbs.list.next; /* have reserved one with sem */ list_del_init(node); spin_unlock_irq(&dlfb->urbs.lock); unode = list_entry(node, struct urb_node, entry); urb = unode->urb; /* Free each separately allocated piece */ usb_free_coherent(urb->dev, dlfb->urbs.size, urb->transfer_buffer, urb->transfer_dma); usb_free_urb(urb); kfree(node); } dlfb->urbs.count = 0; } static int dlfb_alloc_urb_list(struct dlfb_data *dlfb, int count, size_t size) { struct urb *urb; struct urb_node *unode; char *buf; size_t wanted_size = count * size; spin_lock_init(&dlfb->urbs.lock); retry: dlfb->urbs.size = size; INIT_LIST_HEAD(&dlfb->urbs.list); sema_init(&dlfb->urbs.limit_sem, 0); dlfb->urbs.count = 0; dlfb->urbs.available = 0; while (dlfb->urbs.count * size < wanted_size) { unode = kzalloc(sizeof(*unode), GFP_KERNEL); if (!unode) break; unode->dlfb = dlfb; urb = usb_alloc_urb(0, GFP_KERNEL); if (!urb) { kfree(unode); break; } unode->urb = urb; buf = usb_alloc_coherent(dlfb->udev, size, GFP_KERNEL, &urb->transfer_dma); if (!buf) { kfree(unode); usb_free_urb(urb); if (size > PAGE_SIZE) { size /= 2; dlfb_free_urb_list(dlfb); goto retry; } break; } /* urb->transfer_buffer_length set to actual before submit */ usb_fill_bulk_urb(urb, dlfb->udev, usb_sndbulkpipe(dlfb->udev, OUT_EP_NUM), buf, size, dlfb_urb_completion, unode); urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP; list_add_tail(&unode->entry, &dlfb->urbs.list); up(&dlfb->urbs.limit_sem); dlfb->urbs.count++; dlfb->urbs.available++; } return dlfb->urbs.count; } static struct urb *dlfb_get_urb(struct dlfb_data *dlfb) { int ret; struct list_head *entry; struct urb_node *unode; /* Wait for an in-flight buffer to complete and get re-queued */ ret = down_timeout(&dlfb->urbs.limit_sem, GET_URB_TIMEOUT); if (ret) { atomic_set(&dlfb->lost_pixels, 1); dev_warn(&dlfb->udev->dev, "wait for urb interrupted: %d available: %d\n", ret, dlfb->urbs.available); return NULL; } spin_lock_irq(&dlfb->urbs.lock); BUG_ON(list_empty(&dlfb->urbs.list)); /* reserved one with limit_sem */ entry = dlfb->urbs.list.next; list_del_init(entry); dlfb->urbs.available--; spin_unlock_irq(&dlfb->urbs.lock); unode = list_entry(entry, struct urb_node, entry); return unode->urb; } static int dlfb_submit_urb(struct dlfb_data *dlfb, struct urb *urb, size_t len) { int ret; BUG_ON(len > dlfb->urbs.size); urb->transfer_buffer_length = len; /* set to actual payload len */ ret = usb_submit_urb(urb, GFP_KERNEL); if (ret) { dlfb_urb_completion(urb); /* because no one else will */ atomic_set(&dlfb->lost_pixels, 1); dev_err(&dlfb->udev->dev, "submit urb error: %d\n", ret); } return ret; } module_param(console, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); MODULE_PARM_DESC(console, "Allow fbcon to open framebuffer"); module_param(fb_defio, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); MODULE_PARM_DESC(fb_defio, "Page fault detection of mmap writes"); module_param(shadow, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); MODULE_PARM_DESC(shadow, "Shadow vid mem. Disable to save mem but lose perf"); module_param(pixel_limit, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP); MODULE_PARM_DESC(pixel_limit, "Force limit on max mode (in x*y pixels)"); MODULE_AUTHOR("Roberto De Ioris <roberto@unbit.it>, " "Jaya Kumar <jayakumar.lkml@gmail.com>, " "Bernie Thompson <bernie@plugable.com>"); MODULE_DESCRIPTION("DisplayLink kernel framebuffer driver"); MODULE_LICENSE("GPL");
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