1959 lines · c
1// SPDX-License-Identifier: GPL-2.0-only2/*3 * udlfb.c -- Framebuffer driver for DisplayLink USB controller4 *5 * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>6 * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>7 * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>8 *9 * Layout is based on skeletonfb by James Simmons and Geert Uytterhoeven,10 * usb-skeleton by GregKH.11 *12 * Device-specific portions based on information from Displaylink, with work13 * from Florian Echtler, Henrik Bjerregaard Pedersen, and others.14 */15 16#include <linux/module.h>17#include <linux/kernel.h>18#include <linux/init.h>19#include <linux/usb.h>20#include <linux/uaccess.h>21#include <linux/mm.h>22#include <linux/fb.h>23#include <linux/vmalloc.h>24#include <linux/slab.h>25#include <linux/delay.h>26#include <linux/unaligned.h>27#include <video/udlfb.h>28#include "edid.h"29 30#define OUT_EP_NUM 1 /* The endpoint number we will use */31 32static const struct fb_fix_screeninfo dlfb_fix = {33 .id = "udlfb",34 .type = FB_TYPE_PACKED_PIXELS,35 .visual = FB_VISUAL_TRUECOLOR,36 .xpanstep = 0,37 .ypanstep = 0,38 .ywrapstep = 0,39 .accel = FB_ACCEL_NONE,40};41 42static const u32 udlfb_info_flags = FBINFO_READS_FAST |43 FBINFO_VIRTFB |44 FBINFO_HWACCEL_IMAGEBLIT | FBINFO_HWACCEL_FILLRECT |45 FBINFO_HWACCEL_COPYAREA | FBINFO_MISC_ALWAYS_SETPAR;46 47/*48 * There are many DisplayLink-based graphics products, all with unique PIDs.49 * So we match on DisplayLink's VID + Vendor-Defined Interface Class (0xff)50 * We also require a match on SubClass (0x00) and Protocol (0x00),51 * which is compatible with all known USB 2.0 era graphics chips and firmware,52 * but allows DisplayLink to increment those for any future incompatible chips53 */54static const struct usb_device_id id_table[] = {55 {.idVendor = 0x17e9,56 .bInterfaceClass = 0xff,57 .bInterfaceSubClass = 0x00,58 .bInterfaceProtocol = 0x00,59 .match_flags = USB_DEVICE_ID_MATCH_VENDOR |60 USB_DEVICE_ID_MATCH_INT_CLASS |61 USB_DEVICE_ID_MATCH_INT_SUBCLASS |62 USB_DEVICE_ID_MATCH_INT_PROTOCOL,63 },64 {},65};66MODULE_DEVICE_TABLE(usb, id_table);67 68/* module options */69static bool console = true; /* Allow fbcon to open framebuffer */70static bool fb_defio = true; /* Detect mmap writes using page faults */71static bool shadow = true; /* Optionally disable shadow framebuffer */72static int pixel_limit; /* Optionally force a pixel resolution limit */73 74struct dlfb_deferred_free {75 struct list_head list;76 void *mem;77};78 79static int dlfb_realloc_framebuffer(struct dlfb_data *dlfb, struct fb_info *info, u32 new_len);80 81/* dlfb keeps a list of urbs for efficient bulk transfers */82static void dlfb_urb_completion(struct urb *urb);83static struct urb *dlfb_get_urb(struct dlfb_data *dlfb);84static int dlfb_submit_urb(struct dlfb_data *dlfb, struct urb * urb, size_t len);85static int dlfb_alloc_urb_list(struct dlfb_data *dlfb, int count, size_t size);86static void dlfb_free_urb_list(struct dlfb_data *dlfb);87 88/*89 * All DisplayLink bulk operations start with 0xAF, followed by specific code90 * All operations are written to buffers which then later get sent to device91 */92static char *dlfb_set_register(char *buf, u8 reg, u8 val)93{94 *buf++ = 0xAF;95 *buf++ = 0x20;96 *buf++ = reg;97 *buf++ = val;98 return buf;99}100 101static char *dlfb_vidreg_lock(char *buf)102{103 return dlfb_set_register(buf, 0xFF, 0x00);104}105 106static char *dlfb_vidreg_unlock(char *buf)107{108 return dlfb_set_register(buf, 0xFF, 0xFF);109}110 111/*112 * Map FB_BLANK_* to DisplayLink register113 * DLReg FB_BLANK_*114 * ----- -----------------------------115 * 0x00 FB_BLANK_UNBLANK (0)116 * 0x01 FB_BLANK (1)117 * 0x03 FB_BLANK_VSYNC_SUSPEND (2)118 * 0x05 FB_BLANK_HSYNC_SUSPEND (3)119 * 0x07 FB_BLANK_POWERDOWN (4) Note: requires modeset to come back120 */121static char *dlfb_blanking(char *buf, int fb_blank)122{123 u8 reg;124 125 switch (fb_blank) {126 case FB_BLANK_POWERDOWN:127 reg = 0x07;128 break;129 case FB_BLANK_HSYNC_SUSPEND:130 reg = 0x05;131 break;132 case FB_BLANK_VSYNC_SUSPEND:133 reg = 0x03;134 break;135 case FB_BLANK_NORMAL:136 reg = 0x01;137 break;138 default:139 reg = 0x00;140 }141 142 buf = dlfb_set_register(buf, 0x1F, reg);143 144 return buf;145}146 147static char *dlfb_set_color_depth(char *buf, u8 selection)148{149 return dlfb_set_register(buf, 0x00, selection);150}151 152static char *dlfb_set_base16bpp(char *wrptr, u32 base)153{154 /* the base pointer is 16 bits wide, 0x20 is hi byte. */155 wrptr = dlfb_set_register(wrptr, 0x20, base >> 16);156 wrptr = dlfb_set_register(wrptr, 0x21, base >> 8);157 return dlfb_set_register(wrptr, 0x22, base);158}159 160/*161 * DisplayLink HW has separate 16bpp and 8bpp framebuffers.162 * In 24bpp modes, the low 323 RGB bits go in the 8bpp framebuffer163 */164static char *dlfb_set_base8bpp(char *wrptr, u32 base)165{166 wrptr = dlfb_set_register(wrptr, 0x26, base >> 16);167 wrptr = dlfb_set_register(wrptr, 0x27, base >> 8);168 return dlfb_set_register(wrptr, 0x28, base);169}170 171static char *dlfb_set_register_16(char *wrptr, u8 reg, u16 value)172{173 wrptr = dlfb_set_register(wrptr, reg, value >> 8);174 return dlfb_set_register(wrptr, reg+1, value);175}176 177/*178 * This is kind of weird because the controller takes some179 * register values in a different byte order than other registers.180 */181static char *dlfb_set_register_16be(char *wrptr, u8 reg, u16 value)182{183 wrptr = dlfb_set_register(wrptr, reg, value);184 return dlfb_set_register(wrptr, reg+1, value >> 8);185}186 187/*188 * LFSR is linear feedback shift register. The reason we have this is189 * because the display controller needs to minimize the clock depth of190 * various counters used in the display path. So this code reverses the191 * provided value into the lfsr16 value by counting backwards to get192 * the value that needs to be set in the hardware comparator to get the193 * same actual count. This makes sense once you read above a couple of194 * times and think about it from a hardware perspective.195 */196static u16 dlfb_lfsr16(u16 actual_count)197{198 u32 lv = 0xFFFF; /* This is the lfsr value that the hw starts with */199 200 while (actual_count--) {201 lv = ((lv << 1) |202 (((lv >> 15) ^ (lv >> 4) ^ (lv >> 2) ^ (lv >> 1)) & 1))203 & 0xFFFF;204 }205 206 return (u16) lv;207}208 209/*210 * This does LFSR conversion on the value that is to be written.211 * See LFSR explanation above for more detail.212 */213static char *dlfb_set_register_lfsr16(char *wrptr, u8 reg, u16 value)214{215 return dlfb_set_register_16(wrptr, reg, dlfb_lfsr16(value));216}217 218/*219 * This takes a standard fbdev screeninfo struct and all of its monitor mode220 * details and converts them into the DisplayLink equivalent register commands.221 */222static char *dlfb_set_vid_cmds(char *wrptr, struct fb_var_screeninfo *var)223{224 u16 xds, yds;225 u16 xde, yde;226 u16 yec;227 228 /* x display start */229 xds = var->left_margin + var->hsync_len;230 wrptr = dlfb_set_register_lfsr16(wrptr, 0x01, xds);231 /* x display end */232 xde = xds + var->xres;233 wrptr = dlfb_set_register_lfsr16(wrptr, 0x03, xde);234 235 /* y display start */236 yds = var->upper_margin + var->vsync_len;237 wrptr = dlfb_set_register_lfsr16(wrptr, 0x05, yds);238 /* y display end */239 yde = yds + var->yres;240 wrptr = dlfb_set_register_lfsr16(wrptr, 0x07, yde);241 242 /* x end count is active + blanking - 1 */243 wrptr = dlfb_set_register_lfsr16(wrptr, 0x09,244 xde + var->right_margin - 1);245 246 /* libdlo hardcodes hsync start to 1 */247 wrptr = dlfb_set_register_lfsr16(wrptr, 0x0B, 1);248 249 /* hsync end is width of sync pulse + 1 */250 wrptr = dlfb_set_register_lfsr16(wrptr, 0x0D, var->hsync_len + 1);251 252 /* hpixels is active pixels */253 wrptr = dlfb_set_register_16(wrptr, 0x0F, var->xres);254 255 /* yendcount is vertical active + vertical blanking */256 yec = var->yres + var->upper_margin + var->lower_margin +257 var->vsync_len;258 wrptr = dlfb_set_register_lfsr16(wrptr, 0x11, yec);259 260 /* libdlo hardcodes vsync start to 0 */261 wrptr = dlfb_set_register_lfsr16(wrptr, 0x13, 0);262 263 /* vsync end is width of vsync pulse */264 wrptr = dlfb_set_register_lfsr16(wrptr, 0x15, var->vsync_len);265 266 /* vpixels is active pixels */267 wrptr = dlfb_set_register_16(wrptr, 0x17, var->yres);268 269 /* convert picoseconds to 5kHz multiple for pclk5k = x * 1E12/5k */270 wrptr = dlfb_set_register_16be(wrptr, 0x1B,271 200*1000*1000/var->pixclock);272 273 return wrptr;274}275 276/*277 * This takes a standard fbdev screeninfo struct that was fetched or prepared278 * and then generates the appropriate command sequence that then drives the279 * display controller.280 */281static int dlfb_set_video_mode(struct dlfb_data *dlfb,282 struct fb_var_screeninfo *var)283{284 char *buf;285 char *wrptr;286 int retval;287 int writesize;288 struct urb *urb;289 290 if (!atomic_read(&dlfb->usb_active))291 return -EPERM;292 293 urb = dlfb_get_urb(dlfb);294 if (!urb)295 return -ENOMEM;296 297 buf = (char *) urb->transfer_buffer;298 299 /*300 * This first section has to do with setting the base address on the301 * controller * associated with the display. There are 2 base302 * pointers, currently, we only * use the 16 bpp segment.303 */304 wrptr = dlfb_vidreg_lock(buf);305 wrptr = dlfb_set_color_depth(wrptr, 0x00);306 /* set base for 16bpp segment to 0 */307 wrptr = dlfb_set_base16bpp(wrptr, 0);308 /* set base for 8bpp segment to end of fb */309 wrptr = dlfb_set_base8bpp(wrptr, dlfb->info->fix.smem_len);310 311 wrptr = dlfb_set_vid_cmds(wrptr, var);312 wrptr = dlfb_blanking(wrptr, FB_BLANK_UNBLANK);313 wrptr = dlfb_vidreg_unlock(wrptr);314 315 writesize = wrptr - buf;316 317 retval = dlfb_submit_urb(dlfb, urb, writesize);318 319 dlfb->blank_mode = FB_BLANK_UNBLANK;320 321 return retval;322}323 324static int dlfb_ops_mmap(struct fb_info *info, struct vm_area_struct *vma)325{326 unsigned long start = vma->vm_start;327 unsigned long size = vma->vm_end - vma->vm_start;328 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;329 unsigned long page, pos;330 331 if (info->fbdefio)332 return fb_deferred_io_mmap(info, vma);333 334 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);335 336 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))337 return -EINVAL;338 if (size > info->fix.smem_len)339 return -EINVAL;340 if (offset > info->fix.smem_len - size)341 return -EINVAL;342 343 pos = (unsigned long)info->fix.smem_start + offset;344 345 dev_dbg(info->dev, "mmap() framebuffer addr:%lu size:%lu\n",346 pos, size);347 348 while (size > 0) {349 page = vmalloc_to_pfn((void *)pos);350 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))351 return -EAGAIN;352 353 start += PAGE_SIZE;354 pos += PAGE_SIZE;355 if (size > PAGE_SIZE)356 size -= PAGE_SIZE;357 else358 size = 0;359 }360 361 return 0;362}363 364/*365 * Trims identical data from front and back of line366 * Sets new front buffer address and width367 * And returns byte count of identical pixels368 * Assumes CPU natural alignment (unsigned long)369 * for back and front buffer ptrs and width370 */371static int dlfb_trim_hline(const u8 *bback, const u8 **bfront, int *width_bytes)372{373 int j, k;374 const unsigned long *back = (const unsigned long *) bback;375 const unsigned long *front = (const unsigned long *) *bfront;376 const int width = *width_bytes / sizeof(unsigned long);377 int identical;378 int start = width;379 int end = width;380 381 for (j = 0; j < width; j++) {382 if (back[j] != front[j]) {383 start = j;384 break;385 }386 }387 388 for (k = width - 1; k > j; k--) {389 if (back[k] != front[k]) {390 end = k+1;391 break;392 }393 }394 395 identical = start + (width - end);396 *bfront = (u8 *) &front[start];397 *width_bytes = (end - start) * sizeof(unsigned long);398 399 return identical * sizeof(unsigned long);400}401 402/*403 * Render a command stream for an encoded horizontal line segment of pixels.404 *405 * A command buffer holds several commands.406 * It always begins with a fresh command header407 * (the protocol doesn't require this, but we enforce it to allow408 * multiple buffers to be potentially encoded and sent in parallel).409 * A single command encodes one contiguous horizontal line of pixels410 *411 * The function relies on the client to do all allocation, so that412 * rendering can be done directly to output buffers (e.g. USB URBs).413 * The function fills the supplied command buffer, providing information414 * on where it left off, so the client may call in again with additional415 * buffers if the line will take several buffers to complete.416 *417 * A single command can transmit a maximum of 256 pixels,418 * regardless of the compression ratio (protocol design limit).419 * To the hardware, 0 for a size byte means 256420 *421 * Rather than 256 pixel commands which are either rl or raw encoded,422 * the rlx command simply assumes alternating raw and rl spans within one cmd.423 * This has a slightly larger header overhead, but produces more even results.424 * It also processes all data (read and write) in a single pass.425 * Performance benchmarks of common cases show it having just slightly better426 * compression than 256 pixel raw or rle commands, with similar CPU consumpion.427 * But for very rl friendly data, will compress not quite as well.428 */429static void dlfb_compress_hline(430 const uint16_t **pixel_start_ptr,431 const uint16_t *const pixel_end,432 uint32_t *device_address_ptr,433 uint8_t **command_buffer_ptr,434 const uint8_t *const cmd_buffer_end,435 unsigned long back_buffer_offset,436 int *ident_ptr)437{438 const uint16_t *pixel = *pixel_start_ptr;439 uint32_t dev_addr = *device_address_ptr;440 uint8_t *cmd = *command_buffer_ptr;441 442 while ((pixel_end > pixel) &&443 (cmd_buffer_end - MIN_RLX_CMD_BYTES > cmd)) {444 uint8_t *raw_pixels_count_byte = NULL;445 uint8_t *cmd_pixels_count_byte = NULL;446 const uint16_t *raw_pixel_start = NULL;447 const uint16_t *cmd_pixel_start, *cmd_pixel_end = NULL;448 449 if (back_buffer_offset &&450 *pixel == *(u16 *)((u8 *)pixel + back_buffer_offset)) {451 pixel++;452 dev_addr += BPP;453 (*ident_ptr)++;454 continue;455 }456 457 *cmd++ = 0xAF;458 *cmd++ = 0x6B;459 *cmd++ = dev_addr >> 16;460 *cmd++ = dev_addr >> 8;461 *cmd++ = dev_addr;462 463 cmd_pixels_count_byte = cmd++; /* we'll know this later */464 cmd_pixel_start = pixel;465 466 raw_pixels_count_byte = cmd++; /* we'll know this later */467 raw_pixel_start = pixel;468 469 cmd_pixel_end = pixel + min3(MAX_CMD_PIXELS + 1UL,470 (unsigned long)(pixel_end - pixel),471 (unsigned long)(cmd_buffer_end - 1 - cmd) / BPP);472 473 if (back_buffer_offset) {474 /* note: the framebuffer may change under us, so we must test for underflow */475 while (cmd_pixel_end - 1 > pixel &&476 *(cmd_pixel_end - 1) == *(u16 *)((u8 *)(cmd_pixel_end - 1) + back_buffer_offset))477 cmd_pixel_end--;478 }479 480 while (pixel < cmd_pixel_end) {481 const uint16_t * const repeating_pixel = pixel;482 u16 pixel_value = *pixel;483 484 put_unaligned_be16(pixel_value, cmd);485 if (back_buffer_offset)486 *(u16 *)((u8 *)pixel + back_buffer_offset) = pixel_value;487 cmd += 2;488 pixel++;489 490 if (unlikely((pixel < cmd_pixel_end) &&491 (*pixel == pixel_value))) {492 /* go back and fill in raw pixel count */493 *raw_pixels_count_byte = ((repeating_pixel -494 raw_pixel_start) + 1) & 0xFF;495 496 do {497 if (back_buffer_offset)498 *(u16 *)((u8 *)pixel + back_buffer_offset) = pixel_value;499 pixel++;500 } while ((pixel < cmd_pixel_end) &&501 (*pixel == pixel_value));502 503 /* immediately after raw data is repeat byte */504 *cmd++ = ((pixel - repeating_pixel) - 1) & 0xFF;505 506 /* Then start another raw pixel span */507 raw_pixel_start = pixel;508 raw_pixels_count_byte = cmd++;509 }510 }511 512 if (pixel > raw_pixel_start) {513 /* finalize last RAW span */514 *raw_pixels_count_byte = (pixel-raw_pixel_start) & 0xFF;515 } else {516 /* undo unused byte */517 cmd--;518 }519 520 *cmd_pixels_count_byte = (pixel - cmd_pixel_start) & 0xFF;521 dev_addr += (u8 *)pixel - (u8 *)cmd_pixel_start;522 }523 524 if (cmd_buffer_end - MIN_RLX_CMD_BYTES <= cmd) {525 /* Fill leftover bytes with no-ops */526 if (cmd_buffer_end > cmd)527 memset(cmd, 0xAF, cmd_buffer_end - cmd);528 cmd = (uint8_t *) cmd_buffer_end;529 }530 531 *command_buffer_ptr = cmd;532 *pixel_start_ptr = pixel;533 *device_address_ptr = dev_addr;534}535 536/*537 * There are 3 copies of every pixel: The front buffer that the fbdev538 * client renders to, the actual framebuffer across the USB bus in hardware539 * (that we can only write to, slowly, and can never read), and (optionally)540 * our shadow copy that tracks what's been sent to that hardware buffer.541 */542static int dlfb_render_hline(struct dlfb_data *dlfb, struct urb **urb_ptr,543 const char *front, char **urb_buf_ptr,544 u32 byte_offset, u32 byte_width,545 int *ident_ptr, int *sent_ptr)546{547 const u8 *line_start, *line_end, *next_pixel;548 u32 dev_addr = dlfb->base16 + byte_offset;549 struct urb *urb = *urb_ptr;550 u8 *cmd = *urb_buf_ptr;551 u8 *cmd_end = (u8 *) urb->transfer_buffer + urb->transfer_buffer_length;552 unsigned long back_buffer_offset = 0;553 554 line_start = (u8 *) (front + byte_offset);555 next_pixel = line_start;556 line_end = next_pixel + byte_width;557 558 if (dlfb->backing_buffer) {559 int offset;560 const u8 *back_start = (u8 *) (dlfb->backing_buffer561 + byte_offset);562 563 back_buffer_offset = (unsigned long)back_start - (unsigned long)line_start;564 565 *ident_ptr += dlfb_trim_hline(back_start, &next_pixel,566 &byte_width);567 568 offset = next_pixel - line_start;569 line_end = next_pixel + byte_width;570 dev_addr += offset;571 back_start += offset;572 line_start += offset;573 }574 575 while (next_pixel < line_end) {576 577 dlfb_compress_hline((const uint16_t **) &next_pixel,578 (const uint16_t *) line_end, &dev_addr,579 (u8 **) &cmd, (u8 *) cmd_end, back_buffer_offset,580 ident_ptr);581 582 if (cmd >= cmd_end) {583 int len = cmd - (u8 *) urb->transfer_buffer;584 if (dlfb_submit_urb(dlfb, urb, len))585 return 1; /* lost pixels is set */586 *sent_ptr += len;587 urb = dlfb_get_urb(dlfb);588 if (!urb)589 return 1; /* lost_pixels is set */590 *urb_ptr = urb;591 cmd = urb->transfer_buffer;592 cmd_end = &cmd[urb->transfer_buffer_length];593 }594 }595 596 *urb_buf_ptr = cmd;597 598 return 0;599}600 601static int dlfb_handle_damage(struct dlfb_data *dlfb, int x, int y, int width, int height)602{603 int i, ret;604 char *cmd;605 cycles_t start_cycles, end_cycles;606 int bytes_sent = 0;607 int bytes_identical = 0;608 struct urb *urb;609 int aligned_x;610 611 start_cycles = get_cycles();612 613 mutex_lock(&dlfb->render_mutex);614 615 aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long));616 width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long));617 x = aligned_x;618 619 if ((width <= 0) ||620 (x + width > dlfb->info->var.xres) ||621 (y + height > dlfb->info->var.yres)) {622 ret = -EINVAL;623 goto unlock_ret;624 }625 626 if (!atomic_read(&dlfb->usb_active)) {627 ret = 0;628 goto unlock_ret;629 }630 631 urb = dlfb_get_urb(dlfb);632 if (!urb) {633 ret = 0;634 goto unlock_ret;635 }636 cmd = urb->transfer_buffer;637 638 for (i = y; i < y + height ; i++) {639 const int line_offset = dlfb->info->fix.line_length * i;640 const int byte_offset = line_offset + (x * BPP);641 642 if (dlfb_render_hline(dlfb, &urb,643 (char *) dlfb->info->fix.smem_start,644 &cmd, byte_offset, width * BPP,645 &bytes_identical, &bytes_sent))646 goto error;647 }648 649 if (cmd > (char *) urb->transfer_buffer) {650 int len;651 if (cmd < (char *) urb->transfer_buffer + urb->transfer_buffer_length)652 *cmd++ = 0xAF;653 /* Send partial buffer remaining before exiting */654 len = cmd - (char *) urb->transfer_buffer;655 dlfb_submit_urb(dlfb, urb, len);656 bytes_sent += len;657 } else658 dlfb_urb_completion(urb);659 660error:661 atomic_add(bytes_sent, &dlfb->bytes_sent);662 atomic_add(bytes_identical, &dlfb->bytes_identical);663 atomic_add(width*height*2, &dlfb->bytes_rendered);664 end_cycles = get_cycles();665 atomic_add(((unsigned int) ((end_cycles - start_cycles)666 >> 10)), /* Kcycles */667 &dlfb->cpu_kcycles_used);668 669 ret = 0;670 671unlock_ret:672 mutex_unlock(&dlfb->render_mutex);673 return ret;674}675 676static void dlfb_init_damage(struct dlfb_data *dlfb)677{678 dlfb->damage_x = INT_MAX;679 dlfb->damage_x2 = 0;680 dlfb->damage_y = INT_MAX;681 dlfb->damage_y2 = 0;682}683 684static void dlfb_damage_work(struct work_struct *w)685{686 struct dlfb_data *dlfb = container_of(w, struct dlfb_data, damage_work);687 int x, x2, y, y2;688 689 spin_lock_irq(&dlfb->damage_lock);690 x = dlfb->damage_x;691 x2 = dlfb->damage_x2;692 y = dlfb->damage_y;693 y2 = dlfb->damage_y2;694 dlfb_init_damage(dlfb);695 spin_unlock_irq(&dlfb->damage_lock);696 697 if (x < x2 && y < y2)698 dlfb_handle_damage(dlfb, x, y, x2 - x, y2 - y);699}700 701static void dlfb_offload_damage(struct dlfb_data *dlfb, int x, int y, int width, int height)702{703 unsigned long flags;704 int x2 = x + width;705 int y2 = y + height;706 707 if (x >= x2 || y >= y2)708 return;709 710 spin_lock_irqsave(&dlfb->damage_lock, flags);711 dlfb->damage_x = min(x, dlfb->damage_x);712 dlfb->damage_x2 = max(x2, dlfb->damage_x2);713 dlfb->damage_y = min(y, dlfb->damage_y);714 dlfb->damage_y2 = max(y2, dlfb->damage_y2);715 spin_unlock_irqrestore(&dlfb->damage_lock, flags);716 717 schedule_work(&dlfb->damage_work);718}719 720/*721 * NOTE: fb_defio.c is holding info->fbdefio.mutex722 * Touching ANY framebuffer memory that triggers a page fault723 * in fb_defio will cause a deadlock, when it also tries to724 * grab the same mutex.725 */726static void dlfb_dpy_deferred_io(struct fb_info *info, struct list_head *pagereflist)727{728 struct fb_deferred_io_pageref *pageref;729 struct dlfb_data *dlfb = info->par;730 struct urb *urb;731 char *cmd;732 cycles_t start_cycles, end_cycles;733 int bytes_sent = 0;734 int bytes_identical = 0;735 int bytes_rendered = 0;736 737 mutex_lock(&dlfb->render_mutex);738 739 if (!fb_defio)740 goto unlock_ret;741 742 if (!atomic_read(&dlfb->usb_active))743 goto unlock_ret;744 745 start_cycles = get_cycles();746 747 urb = dlfb_get_urb(dlfb);748 if (!urb)749 goto unlock_ret;750 751 cmd = urb->transfer_buffer;752 753 /* walk the written page list and render each to device */754 list_for_each_entry(pageref, pagereflist, list) {755 if (dlfb_render_hline(dlfb, &urb, (char *) info->fix.smem_start,756 &cmd, pageref->offset, PAGE_SIZE,757 &bytes_identical, &bytes_sent))758 goto error;759 bytes_rendered += PAGE_SIZE;760 }761 762 if (cmd > (char *) urb->transfer_buffer) {763 int len;764 if (cmd < (char *) urb->transfer_buffer + urb->transfer_buffer_length)765 *cmd++ = 0xAF;766 /* Send partial buffer remaining before exiting */767 len = cmd - (char *) urb->transfer_buffer;768 dlfb_submit_urb(dlfb, urb, len);769 bytes_sent += len;770 } else771 dlfb_urb_completion(urb);772 773error:774 atomic_add(bytes_sent, &dlfb->bytes_sent);775 atomic_add(bytes_identical, &dlfb->bytes_identical);776 atomic_add(bytes_rendered, &dlfb->bytes_rendered);777 end_cycles = get_cycles();778 atomic_add(((unsigned int) ((end_cycles - start_cycles)779 >> 10)), /* Kcycles */780 &dlfb->cpu_kcycles_used);781unlock_ret:782 mutex_unlock(&dlfb->render_mutex);783}784 785static int dlfb_get_edid(struct dlfb_data *dlfb, char *edid, int len)786{787 int i, ret;788 char *rbuf;789 790 rbuf = kmalloc(2, GFP_KERNEL);791 if (!rbuf)792 return 0;793 794 for (i = 0; i < len; i++) {795 ret = usb_control_msg(dlfb->udev,796 usb_rcvctrlpipe(dlfb->udev, 0), 0x02,797 (0x80 | (0x02 << 5)), i << 8, 0xA1,798 rbuf, 2, USB_CTRL_GET_TIMEOUT);799 if (ret < 2) {800 dev_err(&dlfb->udev->dev,801 "Read EDID byte %d failed: %d\n", i, ret);802 i--;803 break;804 }805 edid[i] = rbuf[1];806 }807 808 kfree(rbuf);809 810 return i;811}812 813static int dlfb_ops_ioctl(struct fb_info *info, unsigned int cmd,814 unsigned long arg)815{816 817 struct dlfb_data *dlfb = info->par;818 819 if (!atomic_read(&dlfb->usb_active))820 return 0;821 822 /* TODO: Update X server to get this from sysfs instead */823 if (cmd == DLFB_IOCTL_RETURN_EDID) {824 void __user *edid = (void __user *)arg;825 if (copy_to_user(edid, dlfb->edid, dlfb->edid_size))826 return -EFAULT;827 return 0;828 }829 830 /* TODO: Help propose a standard fb.h ioctl to report mmap damage */831 if (cmd == DLFB_IOCTL_REPORT_DAMAGE) {832 struct dloarea area;833 834 if (copy_from_user(&area, (void __user *)arg,835 sizeof(struct dloarea)))836 return -EFAULT;837 838 /*839 * If we have a damage-aware client, turn fb_defio "off"840 * To avoid perf imact of unnecessary page fault handling.841 * Done by resetting the delay for this fb_info to a very842 * long period. Pages will become writable and stay that way.843 * Reset to normal value when all clients have closed this fb.844 */845 if (info->fbdefio)846 info->fbdefio->delay = DL_DEFIO_WRITE_DISABLE;847 848 if (area.x < 0)849 area.x = 0;850 851 if (area.x > info->var.xres)852 area.x = info->var.xres;853 854 if (area.y < 0)855 area.y = 0;856 857 if (area.y > info->var.yres)858 area.y = info->var.yres;859 860 dlfb_handle_damage(dlfb, area.x, area.y, area.w, area.h);861 }862 863 return 0;864}865 866/* taken from vesafb */867static int868dlfb_ops_setcolreg(unsigned regno, unsigned red, unsigned green,869 unsigned blue, unsigned transp, struct fb_info *info)870{871 int err = 0;872 873 if (regno >= info->cmap.len)874 return 1;875 876 if (regno < 16) {877 if (info->var.red.offset == 10) {878 /* 1:5:5:5 */879 ((u32 *) (info->pseudo_palette))[regno] =880 ((red & 0xf800) >> 1) |881 ((green & 0xf800) >> 6) | ((blue & 0xf800) >> 11);882 } else {883 /* 0:5:6:5 */884 ((u32 *) (info->pseudo_palette))[regno] =885 ((red & 0xf800)) |886 ((green & 0xfc00) >> 5) | ((blue & 0xf800) >> 11);887 }888 }889 890 return err;891}892 893/*894 * It's common for several clients to have framebuffer open simultaneously.895 * e.g. both fbcon and X. Makes things interesting.896 * Assumes caller is holding info->lock (for open and release at least)897 */898static int dlfb_ops_open(struct fb_info *info, int user)899{900 struct dlfb_data *dlfb = info->par;901 902 /*903 * fbcon aggressively connects to first framebuffer it finds,904 * preventing other clients (X) from working properly. Usually905 * not what the user wants. Fail by default with option to enable.906 */907 if ((user == 0) && (!console))908 return -EBUSY;909 910 /* If the USB device is gone, we don't accept new opens */911 if (dlfb->virtualized)912 return -ENODEV;913 914 dlfb->fb_count++;915 916 if (fb_defio && (info->fbdefio == NULL)) {917 /* enable defio at last moment if not disabled by client */918 919 struct fb_deferred_io *fbdefio;920 921 fbdefio = kzalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);922 923 if (fbdefio) {924 fbdefio->delay = DL_DEFIO_WRITE_DELAY;925 fbdefio->sort_pagereflist = true;926 fbdefio->deferred_io = dlfb_dpy_deferred_io;927 }928 929 info->fbdefio = fbdefio;930 fb_deferred_io_init(info);931 }932 933 dev_dbg(info->dev, "open, user=%d fb_info=%p count=%d\n",934 user, info, dlfb->fb_count);935 936 return 0;937}938 939static void dlfb_ops_destroy(struct fb_info *info)940{941 struct dlfb_data *dlfb = info->par;942 943 cancel_work_sync(&dlfb->damage_work);944 945 mutex_destroy(&dlfb->render_mutex);946 947 if (info->cmap.len != 0)948 fb_dealloc_cmap(&info->cmap);949 if (info->monspecs.modedb)950 fb_destroy_modedb(info->monspecs.modedb);951 vfree(info->screen_buffer);952 953 fb_destroy_modelist(&info->modelist);954 955 while (!list_empty(&dlfb->deferred_free)) {956 struct dlfb_deferred_free *d = list_entry(dlfb->deferred_free.next, struct dlfb_deferred_free, list);957 list_del(&d->list);958 vfree(d->mem);959 kfree(d);960 }961 vfree(dlfb->backing_buffer);962 kfree(dlfb->edid);963 dlfb_free_urb_list(dlfb);964 usb_put_dev(dlfb->udev);965 kfree(dlfb);966 967 /* Assume info structure is freed after this point */968 framebuffer_release(info);969}970 971/*972 * Assumes caller is holding info->lock mutex (for open and release at least)973 */974static int dlfb_ops_release(struct fb_info *info, int user)975{976 struct dlfb_data *dlfb = info->par;977 978 dlfb->fb_count--;979 980 if ((dlfb->fb_count == 0) && (info->fbdefio)) {981 fb_deferred_io_cleanup(info);982 kfree(info->fbdefio);983 info->fbdefio = NULL;984 }985 986 dev_dbg(info->dev, "release, user=%d count=%d\n", user, dlfb->fb_count);987 988 return 0;989}990 991/*992 * Check whether a video mode is supported by the DisplayLink chip993 * We start from monitor's modes, so don't need to filter that here994 */995static int dlfb_is_valid_mode(struct fb_videomode *mode, struct dlfb_data *dlfb)996{997 if (mode->xres * mode->yres > dlfb->sku_pixel_limit)998 return 0;999 1000 return 1;1001}1002 1003static void dlfb_var_color_format(struct fb_var_screeninfo *var)1004{1005 const struct fb_bitfield red = { 11, 5, 0 };1006 const struct fb_bitfield green = { 5, 6, 0 };1007 const struct fb_bitfield blue = { 0, 5, 0 };1008 1009 var->bits_per_pixel = 16;1010 var->red = red;1011 var->green = green;1012 var->blue = blue;1013}1014 1015static int dlfb_ops_check_var(struct fb_var_screeninfo *var,1016 struct fb_info *info)1017{1018 struct fb_videomode mode;1019 struct dlfb_data *dlfb = info->par;1020 1021 /* set device-specific elements of var unrelated to mode */1022 dlfb_var_color_format(var);1023 1024 fb_var_to_videomode(&mode, var);1025 1026 if (!dlfb_is_valid_mode(&mode, dlfb))1027 return -EINVAL;1028 1029 return 0;1030}1031 1032static int dlfb_ops_set_par(struct fb_info *info)1033{1034 struct dlfb_data *dlfb = info->par;1035 int result;1036 u16 *pix_framebuffer;1037 int i;1038 struct fb_var_screeninfo fvs;1039 u32 line_length = info->var.xres * (info->var.bits_per_pixel / 8);1040 1041 /* clear the activate field because it causes spurious miscompares */1042 fvs = info->var;1043 fvs.activate = 0;1044 fvs.vmode &= ~FB_VMODE_SMOOTH_XPAN;1045 1046 if (!memcmp(&dlfb->current_mode, &fvs, sizeof(struct fb_var_screeninfo)))1047 return 0;1048 1049 result = dlfb_realloc_framebuffer(dlfb, info, info->var.yres * line_length);1050 if (result)1051 return result;1052 1053 result = dlfb_set_video_mode(dlfb, &info->var);1054 1055 if (result)1056 return result;1057 1058 dlfb->current_mode = fvs;1059 info->fix.line_length = line_length;1060 1061 if (dlfb->fb_count == 0) {1062 1063 /* paint greenscreen */1064 1065 pix_framebuffer = (u16 *)info->screen_buffer;1066 for (i = 0; i < info->fix.smem_len / 2; i++)1067 pix_framebuffer[i] = 0x37e6;1068 }1069 1070 dlfb_handle_damage(dlfb, 0, 0, info->var.xres, info->var.yres);1071 1072 return 0;1073}1074 1075/* To fonzi the jukebox (e.g. make blanking changes take effect) */1076static char *dlfb_dummy_render(char *buf)1077{1078 *buf++ = 0xAF;1079 *buf++ = 0x6A; /* copy */1080 *buf++ = 0x00; /* from address*/1081 *buf++ = 0x00;1082 *buf++ = 0x00;1083 *buf++ = 0x01; /* one pixel */1084 *buf++ = 0x00; /* to address */1085 *buf++ = 0x00;1086 *buf++ = 0x00;1087 return buf;1088}1089 1090/*1091 * In order to come back from full DPMS off, we need to set the mode again1092 */1093static int dlfb_ops_blank(int blank_mode, struct fb_info *info)1094{1095 struct dlfb_data *dlfb = info->par;1096 char *bufptr;1097 struct urb *urb;1098 1099 dev_dbg(info->dev, "blank, mode %d --> %d\n",1100 dlfb->blank_mode, blank_mode);1101 1102 if ((dlfb->blank_mode == FB_BLANK_POWERDOWN) &&1103 (blank_mode != FB_BLANK_POWERDOWN)) {1104 1105 /* returning from powerdown requires a fresh modeset */1106 dlfb_set_video_mode(dlfb, &info->var);1107 }1108 1109 urb = dlfb_get_urb(dlfb);1110 if (!urb)1111 return 0;1112 1113 bufptr = (char *) urb->transfer_buffer;1114 bufptr = dlfb_vidreg_lock(bufptr);1115 bufptr = dlfb_blanking(bufptr, blank_mode);1116 bufptr = dlfb_vidreg_unlock(bufptr);1117 1118 /* seems like a render op is needed to have blank change take effect */1119 bufptr = dlfb_dummy_render(bufptr);1120 1121 dlfb_submit_urb(dlfb, urb, bufptr -1122 (char *) urb->transfer_buffer);1123 1124 dlfb->blank_mode = blank_mode;1125 1126 return 0;1127}1128 1129static void dlfb_ops_damage_range(struct fb_info *info, off_t off, size_t len)1130{1131 struct dlfb_data *dlfb = info->par;1132 int start = max((int)(off / info->fix.line_length), 0);1133 int lines = min((u32)((len / info->fix.line_length) + 1), (u32)info->var.yres);1134 1135 dlfb_handle_damage(dlfb, 0, start, info->var.xres, lines);1136}1137 1138static void dlfb_ops_damage_area(struct fb_info *info, u32 x, u32 y, u32 width, u32 height)1139{1140 struct dlfb_data *dlfb = info->par;1141 1142 dlfb_offload_damage(dlfb, x, y, width, height);1143}1144 1145FB_GEN_DEFAULT_DEFERRED_SYSMEM_OPS(dlfb_ops,1146 dlfb_ops_damage_range,1147 dlfb_ops_damage_area)1148 1149static const struct fb_ops dlfb_ops = {1150 .owner = THIS_MODULE,1151 __FB_DEFAULT_DEFERRED_OPS_RDWR(dlfb_ops),1152 .fb_setcolreg = dlfb_ops_setcolreg,1153 __FB_DEFAULT_DEFERRED_OPS_DRAW(dlfb_ops),1154 .fb_mmap = dlfb_ops_mmap,1155 .fb_ioctl = dlfb_ops_ioctl,1156 .fb_open = dlfb_ops_open,1157 .fb_release = dlfb_ops_release,1158 .fb_blank = dlfb_ops_blank,1159 .fb_check_var = dlfb_ops_check_var,1160 .fb_set_par = dlfb_ops_set_par,1161 .fb_destroy = dlfb_ops_destroy,1162};1163 1164 1165static void dlfb_deferred_vfree(struct dlfb_data *dlfb, void *mem)1166{1167 struct dlfb_deferred_free *d = kmalloc(sizeof(struct dlfb_deferred_free), GFP_KERNEL);1168 if (!d)1169 return;1170 d->mem = mem;1171 list_add(&d->list, &dlfb->deferred_free);1172}1173 1174/*1175 * Assumes &info->lock held by caller1176 * Assumes no active clients have framebuffer open1177 */1178static int dlfb_realloc_framebuffer(struct dlfb_data *dlfb, struct fb_info *info, u32 new_len)1179{1180 u32 old_len = info->fix.smem_len;1181 const void *old_fb = info->screen_buffer;1182 unsigned char *new_fb;1183 unsigned char *new_back = NULL;1184 1185 new_len = PAGE_ALIGN(new_len);1186 1187 if (new_len > old_len) {1188 /*1189 * Alloc system memory for virtual framebuffer1190 */1191 new_fb = vmalloc(new_len);1192 if (!new_fb) {1193 dev_err(info->dev, "Virtual framebuffer alloc failed\n");1194 return -ENOMEM;1195 }1196 memset(new_fb, 0xff, new_len);1197 1198 if (info->screen_buffer) {1199 memcpy(new_fb, old_fb, old_len);1200 dlfb_deferred_vfree(dlfb, info->screen_buffer);1201 }1202 1203 info->screen_buffer = new_fb;1204 info->fix.smem_len = new_len;1205 info->fix.smem_start = (unsigned long) new_fb;1206 info->flags = udlfb_info_flags;1207 1208 /*1209 * Second framebuffer copy to mirror the framebuffer state1210 * on the physical USB device. We can function without this.1211 * But with imperfect damage info we may send pixels over USB1212 * that were, in fact, unchanged - wasting limited USB bandwidth1213 */1214 if (shadow)1215 new_back = vzalloc(new_len);1216 if (!new_back)1217 dev_info(info->dev,1218 "No shadow/backing buffer allocated\n");1219 else {1220 dlfb_deferred_vfree(dlfb, dlfb->backing_buffer);1221 dlfb->backing_buffer = new_back;1222 }1223 }1224 return 0;1225}1226 1227/*1228 * 1) Get EDID from hw, or use sw default1229 * 2) Parse into various fb_info structs1230 * 3) Allocate virtual framebuffer memory to back highest res mode1231 *1232 * Parses EDID into three places used by various parts of fbdev:1233 * fb_var_screeninfo contains the timing of the monitor's preferred mode1234 * fb_info.monspecs is full parsed EDID info, including monspecs.modedb1235 * fb_info.modelist is a linked list of all monitor & VESA modes which work1236 *1237 * If EDID is not readable/valid, then modelist is all VESA modes,1238 * monspecs is NULL, and fb_var_screeninfo is set to safe VESA mode1239 * Returns 0 if successful1240 */1241static int dlfb_setup_modes(struct dlfb_data *dlfb,1242 struct fb_info *info,1243 char *default_edid, size_t default_edid_size)1244{1245 char *edid;1246 int i, result = 0, tries = 3;1247 struct device *dev = info->device;1248 struct fb_videomode *mode;1249 const struct fb_videomode *default_vmode = NULL;1250 1251 if (info->dev) {1252 /* only use mutex if info has been registered */1253 mutex_lock(&info->lock);1254 /* parent device is used otherwise */1255 dev = info->dev;1256 }1257 1258 edid = kmalloc(EDID_LENGTH, GFP_KERNEL);1259 if (!edid) {1260 result = -ENOMEM;1261 goto error;1262 }1263 1264 fb_destroy_modelist(&info->modelist);1265 memset(&info->monspecs, 0, sizeof(info->monspecs));1266 1267 /*1268 * Try to (re)read EDID from hardware first1269 * EDID data may return, but not parse as valid1270 * Try again a few times, in case of e.g. analog cable noise1271 */1272 while (tries--) {1273 1274 i = dlfb_get_edid(dlfb, edid, EDID_LENGTH);1275 1276 if (i >= EDID_LENGTH)1277 fb_edid_to_monspecs(edid, &info->monspecs);1278 1279 if (info->monspecs.modedb_len > 0) {1280 dlfb->edid = edid;1281 dlfb->edid_size = i;1282 break;1283 }1284 }1285 1286 /* If that fails, use a previously returned EDID if available */1287 if (info->monspecs.modedb_len == 0) {1288 dev_err(dev, "Unable to get valid EDID from device/display\n");1289 1290 if (dlfb->edid) {1291 fb_edid_to_monspecs(dlfb->edid, &info->monspecs);1292 if (info->monspecs.modedb_len > 0)1293 dev_err(dev, "Using previously queried EDID\n");1294 }1295 }1296 1297 /* If that fails, use the default EDID we were handed */1298 if (info->monspecs.modedb_len == 0) {1299 if (default_edid_size >= EDID_LENGTH) {1300 fb_edid_to_monspecs(default_edid, &info->monspecs);1301 if (info->monspecs.modedb_len > 0) {1302 memcpy(edid, default_edid, default_edid_size);1303 dlfb->edid = edid;1304 dlfb->edid_size = default_edid_size;1305 dev_err(dev, "Using default/backup EDID\n");1306 }1307 }1308 }1309 1310 /* If we've got modes, let's pick a best default mode */1311 if (info->monspecs.modedb_len > 0) {1312 1313 for (i = 0; i < info->monspecs.modedb_len; i++) {1314 mode = &info->monspecs.modedb[i];1315 if (dlfb_is_valid_mode(mode, dlfb)) {1316 fb_add_videomode(mode, &info->modelist);1317 } else {1318 dev_dbg(dev, "Specified mode %dx%d too big\n",1319 mode->xres, mode->yres);1320 if (i == 0)1321 /* if we've removed top/best mode */1322 info->monspecs.misc1323 &= ~FB_MISC_1ST_DETAIL;1324 }1325 }1326 1327 default_vmode = fb_find_best_display(&info->monspecs,1328 &info->modelist);1329 }1330 1331 /* If everything else has failed, fall back to safe default mode */1332 if (default_vmode == NULL) {1333 1334 struct fb_videomode fb_vmode = {0};1335 1336 /*1337 * Add the standard VESA modes to our modelist1338 * Since we don't have EDID, there may be modes that1339 * overspec monitor and/or are incorrect aspect ratio, etc.1340 * But at least the user has a chance to choose1341 */1342 for (i = 0; i < VESA_MODEDB_SIZE; i++) {1343 mode = (struct fb_videomode *)&vesa_modes[i];1344 if (dlfb_is_valid_mode(mode, dlfb))1345 fb_add_videomode(mode, &info->modelist);1346 else1347 dev_dbg(dev, "VESA mode %dx%d too big\n",1348 mode->xres, mode->yres);1349 }1350 1351 /*1352 * default to resolution safe for projectors1353 * (since they are most common case without EDID)1354 */1355 fb_vmode.xres = 800;1356 fb_vmode.yres = 600;1357 fb_vmode.refresh = 60;1358 default_vmode = fb_find_nearest_mode(&fb_vmode,1359 &info->modelist);1360 }1361 1362 /* If we have good mode and no active clients*/1363 if ((default_vmode != NULL) && (dlfb->fb_count == 0)) {1364 1365 fb_videomode_to_var(&info->var, default_vmode);1366 dlfb_var_color_format(&info->var);1367 1368 /*1369 * with mode size info, we can now alloc our framebuffer.1370 */1371 memcpy(&info->fix, &dlfb_fix, sizeof(dlfb_fix));1372 } else1373 result = -EINVAL;1374 1375error:1376 if (edid && (dlfb->edid != edid))1377 kfree(edid);1378 1379 if (info->dev)1380 mutex_unlock(&info->lock);1381 1382 return result;1383}1384 1385static ssize_t metrics_bytes_rendered_show(struct device *fbdev,1386 struct device_attribute *a, char *buf) {1387 struct fb_info *fb_info = dev_get_drvdata(fbdev);1388 struct dlfb_data *dlfb = fb_info->par;1389 return sysfs_emit(buf, "%u\n",1390 atomic_read(&dlfb->bytes_rendered));1391}1392 1393static ssize_t metrics_bytes_identical_show(struct device *fbdev,1394 struct device_attribute *a, char *buf) {1395 struct fb_info *fb_info = dev_get_drvdata(fbdev);1396 struct dlfb_data *dlfb = fb_info->par;1397 return sysfs_emit(buf, "%u\n",1398 atomic_read(&dlfb->bytes_identical));1399}1400 1401static ssize_t metrics_bytes_sent_show(struct device *fbdev,1402 struct device_attribute *a, char *buf) {1403 struct fb_info *fb_info = dev_get_drvdata(fbdev);1404 struct dlfb_data *dlfb = fb_info->par;1405 return sysfs_emit(buf, "%u\n",1406 atomic_read(&dlfb->bytes_sent));1407}1408 1409static ssize_t metrics_cpu_kcycles_used_show(struct device *fbdev,1410 struct device_attribute *a, char *buf) {1411 struct fb_info *fb_info = dev_get_drvdata(fbdev);1412 struct dlfb_data *dlfb = fb_info->par;1413 return sysfs_emit(buf, "%u\n",1414 atomic_read(&dlfb->cpu_kcycles_used));1415}1416 1417static ssize_t edid_show(1418 struct file *filp,1419 struct kobject *kobj, struct bin_attribute *a,1420 char *buf, loff_t off, size_t count) {1421 struct device *fbdev = kobj_to_dev(kobj);1422 struct fb_info *fb_info = dev_get_drvdata(fbdev);1423 struct dlfb_data *dlfb = fb_info->par;1424 1425 if (dlfb->edid == NULL)1426 return 0;1427 1428 if ((off >= dlfb->edid_size) || (count > dlfb->edid_size))1429 return 0;1430 1431 if (off + count > dlfb->edid_size)1432 count = dlfb->edid_size - off;1433 1434 memcpy(buf, dlfb->edid, count);1435 1436 return count;1437}1438 1439static ssize_t edid_store(1440 struct file *filp,1441 struct kobject *kobj, struct bin_attribute *a,1442 char *src, loff_t src_off, size_t src_size) {1443 struct device *fbdev = kobj_to_dev(kobj);1444 struct fb_info *fb_info = dev_get_drvdata(fbdev);1445 struct dlfb_data *dlfb = fb_info->par;1446 int ret;1447 1448 /* We only support write of entire EDID at once, no offset*/1449 if ((src_size != EDID_LENGTH) || (src_off != 0))1450 return -EINVAL;1451 1452 ret = dlfb_setup_modes(dlfb, fb_info, src, src_size);1453 if (ret)1454 return ret;1455 1456 if (!dlfb->edid || memcmp(src, dlfb->edid, src_size))1457 return -EINVAL;1458 1459 ret = dlfb_ops_set_par(fb_info);1460 if (ret)1461 return ret;1462 1463 return src_size;1464}1465 1466static ssize_t metrics_reset_store(struct device *fbdev,1467 struct device_attribute *attr,1468 const char *buf, size_t count)1469{1470 struct fb_info *fb_info = dev_get_drvdata(fbdev);1471 struct dlfb_data *dlfb = fb_info->par;1472 1473 atomic_set(&dlfb->bytes_rendered, 0);1474 atomic_set(&dlfb->bytes_identical, 0);1475 atomic_set(&dlfb->bytes_sent, 0);1476 atomic_set(&dlfb->cpu_kcycles_used, 0);1477 1478 return count;1479}1480 1481static const struct bin_attribute edid_attr = {1482 .attr.name = "edid",1483 .attr.mode = 0666,1484 .size = EDID_LENGTH,1485 .read = edid_show,1486 .write = edid_store1487};1488 1489static const struct device_attribute fb_device_attrs[] = {1490 __ATTR_RO(metrics_bytes_rendered),1491 __ATTR_RO(metrics_bytes_identical),1492 __ATTR_RO(metrics_bytes_sent),1493 __ATTR_RO(metrics_cpu_kcycles_used),1494 __ATTR(metrics_reset, S_IWUSR, NULL, metrics_reset_store),1495};1496 1497/*1498 * This is necessary before we can communicate with the display controller.1499 */1500static int dlfb_select_std_channel(struct dlfb_data *dlfb)1501{1502 int ret;1503 static const u8 set_def_chn[] = {1504 0x57, 0xCD, 0xDC, 0xA7,1505 0x1C, 0x88, 0x5E, 0x15,1506 0x60, 0xFE, 0xC6, 0x97,1507 0x16, 0x3D, 0x47, 0xF2 };1508 1509 ret = usb_control_msg_send(dlfb->udev, 0, NR_USB_REQUEST_CHANNEL,1510 (USB_DIR_OUT | USB_TYPE_VENDOR), 0, 0,1511 &set_def_chn, sizeof(set_def_chn), USB_CTRL_SET_TIMEOUT,1512 GFP_KERNEL);1513 1514 return ret;1515}1516 1517static int dlfb_parse_vendor_descriptor(struct dlfb_data *dlfb,1518 struct usb_interface *intf)1519{1520 char *desc;1521 char *buf;1522 char *desc_end;1523 int total_len;1524 1525 buf = kzalloc(MAX_VENDOR_DESCRIPTOR_SIZE, GFP_KERNEL);1526 if (!buf)1527 return false;1528 desc = buf;1529 1530 total_len = usb_get_descriptor(interface_to_usbdev(intf),1531 0x5f, /* vendor specific */1532 0, desc, MAX_VENDOR_DESCRIPTOR_SIZE);1533 1534 /* if not found, look in configuration descriptor */1535 if (total_len < 0) {1536 if (0 == usb_get_extra_descriptor(intf->cur_altsetting,1537 0x5f, &desc))1538 total_len = (int) desc[0];1539 }1540 1541 if (total_len > 5) {1542 dev_info(&intf->dev,1543 "vendor descriptor length: %d data: %11ph\n",1544 total_len, desc);1545 1546 if ((desc[0] != total_len) || /* descriptor length */1547 (desc[1] != 0x5f) || /* vendor descriptor type */1548 (desc[2] != 0x01) || /* version (2 bytes) */1549 (desc[3] != 0x00) ||1550 (desc[4] != total_len - 2)) /* length after type */1551 goto unrecognized;1552 1553 desc_end = desc + total_len;1554 desc += 5; /* the fixed header we've already parsed */1555 1556 while (desc < desc_end) {1557 u8 length;1558 u16 key;1559 1560 key = *desc++;1561 key |= (u16)*desc++ << 8;1562 length = *desc++;1563 1564 switch (key) {1565 case 0x0200: { /* max_area */1566 u32 max_area = *desc++;1567 max_area |= (u32)*desc++ << 8;1568 max_area |= (u32)*desc++ << 16;1569 max_area |= (u32)*desc++ << 24;1570 dev_warn(&intf->dev,1571 "DL chip limited to %d pixel modes\n",1572 max_area);1573 dlfb->sku_pixel_limit = max_area;1574 break;1575 }1576 default:1577 break;1578 }1579 desc += length;1580 }1581 } else {1582 dev_info(&intf->dev, "vendor descriptor not available (%d)\n",1583 total_len);1584 }1585 1586 goto success;1587 1588unrecognized:1589 /* allow udlfb to load for now even if firmware unrecognized */1590 dev_err(&intf->dev, "Unrecognized vendor firmware descriptor\n");1591 1592success:1593 kfree(buf);1594 return true;1595}1596 1597static int dlfb_usb_probe(struct usb_interface *intf,1598 const struct usb_device_id *id)1599{1600 int i;1601 const struct device_attribute *attr;1602 struct dlfb_data *dlfb;1603 struct fb_info *info;1604 int retval;1605 struct usb_device *usbdev = interface_to_usbdev(intf);1606 static u8 out_ep[] = {OUT_EP_NUM + USB_DIR_OUT, 0};1607 1608 /* usb initialization */1609 dlfb = kzalloc(sizeof(*dlfb), GFP_KERNEL);1610 if (!dlfb) {1611 dev_err(&intf->dev, "%s: failed to allocate dlfb\n", __func__);1612 return -ENOMEM;1613 }1614 1615 INIT_LIST_HEAD(&dlfb->deferred_free);1616 1617 dlfb->udev = usb_get_dev(usbdev);1618 usb_set_intfdata(intf, dlfb);1619 1620 if (!usb_check_bulk_endpoints(intf, out_ep)) {1621 dev_err(&intf->dev, "Invalid DisplayLink device!\n");1622 retval = -EINVAL;1623 goto error;1624 }1625 1626 dev_dbg(&intf->dev, "console enable=%d\n", console);1627 dev_dbg(&intf->dev, "fb_defio enable=%d\n", fb_defio);1628 dev_dbg(&intf->dev, "shadow enable=%d\n", shadow);1629 1630 dlfb->sku_pixel_limit = 2048 * 1152; /* default to maximum */1631 1632 if (!dlfb_parse_vendor_descriptor(dlfb, intf)) {1633 dev_err(&intf->dev,1634 "firmware not recognized, incompatible device?\n");1635 retval = -ENODEV;1636 goto error;1637 }1638 1639 if (pixel_limit) {1640 dev_warn(&intf->dev,1641 "DL chip limit of %d overridden to %d\n",1642 dlfb->sku_pixel_limit, pixel_limit);1643 dlfb->sku_pixel_limit = pixel_limit;1644 }1645 1646 1647 /* allocates framebuffer driver structure, not framebuffer memory */1648 info = framebuffer_alloc(0, &dlfb->udev->dev);1649 if (!info) {1650 retval = -ENOMEM;1651 goto error;1652 }1653 1654 dlfb->info = info;1655 info->par = dlfb;1656 info->pseudo_palette = dlfb->pseudo_palette;1657 dlfb->ops = dlfb_ops;1658 info->fbops = &dlfb->ops;1659 1660 mutex_init(&dlfb->render_mutex);1661 dlfb_init_damage(dlfb);1662 spin_lock_init(&dlfb->damage_lock);1663 INIT_WORK(&dlfb->damage_work, dlfb_damage_work);1664 1665 INIT_LIST_HEAD(&info->modelist);1666 1667 if (!dlfb_alloc_urb_list(dlfb, WRITES_IN_FLIGHT, MAX_TRANSFER)) {1668 retval = -ENOMEM;1669 dev_err(&intf->dev, "unable to allocate urb list\n");1670 goto error;1671 }1672 1673 /* We don't register a new USB class. Our client interface is dlfbev */1674 1675 retval = fb_alloc_cmap(&info->cmap, 256, 0);1676 if (retval < 0) {1677 dev_err(info->device, "cmap allocation failed: %d\n", retval);1678 goto error;1679 }1680 1681 retval = dlfb_setup_modes(dlfb, info, NULL, 0);1682 if (retval != 0) {1683 dev_err(info->device,1684 "unable to find common mode for display and adapter\n");1685 goto error;1686 }1687 1688 /* ready to begin using device */1689 1690 atomic_set(&dlfb->usb_active, 1);1691 dlfb_select_std_channel(dlfb);1692 1693 dlfb_ops_check_var(&info->var, info);1694 retval = dlfb_ops_set_par(info);1695 if (retval)1696 goto error;1697 1698 retval = register_framebuffer(info);1699 if (retval < 0) {1700 dev_err(info->device, "unable to register framebuffer: %d\n",1701 retval);1702 goto error;1703 }1704 1705 for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++) {1706 attr = &fb_device_attrs[i];1707 retval = device_create_file(info->dev, attr);1708 if (retval)1709 dev_warn(info->device,1710 "failed to create '%s' attribute: %d\n",1711 attr->attr.name, retval);1712 }1713 1714 retval = device_create_bin_file(info->dev, &edid_attr);1715 if (retval)1716 dev_warn(info->device, "failed to create '%s' attribute: %d\n",1717 edid_attr.attr.name, retval);1718 1719 dev_info(info->device,1720 "%s is DisplayLink USB device (%dx%d, %dK framebuffer memory)\n",1721 dev_name(info->dev), info->var.xres, info->var.yres,1722 ((dlfb->backing_buffer) ?1723 info->fix.smem_len * 2 : info->fix.smem_len) >> 10);1724 return 0;1725 1726error:1727 if (dlfb->info) {1728 dlfb_ops_destroy(dlfb->info);1729 } else {1730 usb_put_dev(dlfb->udev);1731 kfree(dlfb);1732 }1733 return retval;1734}1735 1736static void dlfb_usb_disconnect(struct usb_interface *intf)1737{1738 struct dlfb_data *dlfb;1739 struct fb_info *info;1740 int i;1741 1742 dlfb = usb_get_intfdata(intf);1743 info = dlfb->info;1744 1745 dev_dbg(&intf->dev, "USB disconnect starting\n");1746 1747 /* we virtualize until all fb clients release. Then we free */1748 dlfb->virtualized = true;1749 1750 /* When non-active we'll update virtual framebuffer, but no new urbs */1751 atomic_set(&dlfb->usb_active, 0);1752 1753 /* this function will wait for all in-flight urbs to complete */1754 dlfb_free_urb_list(dlfb);1755 1756 /* remove udlfb's sysfs interfaces */1757 for (i = 0; i < ARRAY_SIZE(fb_device_attrs); i++)1758 device_remove_file(info->dev, &fb_device_attrs[i]);1759 device_remove_bin_file(info->dev, &edid_attr);1760 1761 unregister_framebuffer(info);1762}1763 1764static struct usb_driver dlfb_driver = {1765 .name = "udlfb",1766 .probe = dlfb_usb_probe,1767 .disconnect = dlfb_usb_disconnect,1768 .id_table = id_table,1769};1770 1771module_usb_driver(dlfb_driver);1772 1773static void dlfb_urb_completion(struct urb *urb)1774{1775 struct urb_node *unode = urb->context;1776 struct dlfb_data *dlfb = unode->dlfb;1777 unsigned long flags;1778 1779 switch (urb->status) {1780 case 0:1781 /* success */1782 break;1783 case -ECONNRESET:1784 case -ENOENT:1785 case -ESHUTDOWN:1786 /* sync/async unlink faults aren't errors */1787 break;1788 default:1789 dev_err(&dlfb->udev->dev,1790 "%s - nonzero write bulk status received: %d\n",1791 __func__, urb->status);1792 atomic_set(&dlfb->lost_pixels, 1);1793 break;1794 }1795 1796 urb->transfer_buffer_length = dlfb->urbs.size; /* reset to actual */1797 1798 spin_lock_irqsave(&dlfb->urbs.lock, flags);1799 list_add_tail(&unode->entry, &dlfb->urbs.list);1800 dlfb->urbs.available++;1801 spin_unlock_irqrestore(&dlfb->urbs.lock, flags);1802 1803 up(&dlfb->urbs.limit_sem);1804}1805 1806static void dlfb_free_urb_list(struct dlfb_data *dlfb)1807{1808 int count = dlfb->urbs.count;1809 struct list_head *node;1810 struct urb_node *unode;1811 struct urb *urb;1812 1813 /* keep waiting and freeing, until we've got 'em all */1814 while (count--) {1815 down(&dlfb->urbs.limit_sem);1816 1817 spin_lock_irq(&dlfb->urbs.lock);1818 1819 node = dlfb->urbs.list.next; /* have reserved one with sem */1820 list_del_init(node);1821 1822 spin_unlock_irq(&dlfb->urbs.lock);1823 1824 unode = list_entry(node, struct urb_node, entry);1825 urb = unode->urb;1826 1827 /* Free each separately allocated piece */1828 usb_free_coherent(urb->dev, dlfb->urbs.size,1829 urb->transfer_buffer, urb->transfer_dma);1830 usb_free_urb(urb);1831 kfree(node);1832 }1833 1834 dlfb->urbs.count = 0;1835}1836 1837static int dlfb_alloc_urb_list(struct dlfb_data *dlfb, int count, size_t size)1838{1839 struct urb *urb;1840 struct urb_node *unode;1841 char *buf;1842 size_t wanted_size = count * size;1843 1844 spin_lock_init(&dlfb->urbs.lock);1845 1846retry:1847 dlfb->urbs.size = size;1848 INIT_LIST_HEAD(&dlfb->urbs.list);1849 1850 sema_init(&dlfb->urbs.limit_sem, 0);1851 dlfb->urbs.count = 0;1852 dlfb->urbs.available = 0;1853 1854 while (dlfb->urbs.count * size < wanted_size) {1855 unode = kzalloc(sizeof(*unode), GFP_KERNEL);1856 if (!unode)1857 break;1858 unode->dlfb = dlfb;1859 1860 urb = usb_alloc_urb(0, GFP_KERNEL);1861 if (!urb) {1862 kfree(unode);1863 break;1864 }1865 unode->urb = urb;1866 1867 buf = usb_alloc_coherent(dlfb->udev, size, GFP_KERNEL,1868 &urb->transfer_dma);1869 if (!buf) {1870 kfree(unode);1871 usb_free_urb(urb);1872 if (size > PAGE_SIZE) {1873 size /= 2;1874 dlfb_free_urb_list(dlfb);1875 goto retry;1876 }1877 break;1878 }1879 1880 /* urb->transfer_buffer_length set to actual before submit */1881 usb_fill_bulk_urb(urb, dlfb->udev,1882 usb_sndbulkpipe(dlfb->udev, OUT_EP_NUM),1883 buf, size, dlfb_urb_completion, unode);1884 urb->transfer_flags |= URB_NO_TRANSFER_DMA_MAP;1885 1886 list_add_tail(&unode->entry, &dlfb->urbs.list);1887 1888 up(&dlfb->urbs.limit_sem);1889 dlfb->urbs.count++;1890 dlfb->urbs.available++;1891 }1892 1893 return dlfb->urbs.count;1894}1895 1896static struct urb *dlfb_get_urb(struct dlfb_data *dlfb)1897{1898 int ret;1899 struct list_head *entry;1900 struct urb_node *unode;1901 1902 /* Wait for an in-flight buffer to complete and get re-queued */1903 ret = down_timeout(&dlfb->urbs.limit_sem, GET_URB_TIMEOUT);1904 if (ret) {1905 atomic_set(&dlfb->lost_pixels, 1);1906 dev_warn(&dlfb->udev->dev,1907 "wait for urb interrupted: %d available: %d\n",1908 ret, dlfb->urbs.available);1909 return NULL;1910 }1911 1912 spin_lock_irq(&dlfb->urbs.lock);1913 1914 BUG_ON(list_empty(&dlfb->urbs.list)); /* reserved one with limit_sem */1915 entry = dlfb->urbs.list.next;1916 list_del_init(entry);1917 dlfb->urbs.available--;1918 1919 spin_unlock_irq(&dlfb->urbs.lock);1920 1921 unode = list_entry(entry, struct urb_node, entry);1922 return unode->urb;1923}1924 1925static int dlfb_submit_urb(struct dlfb_data *dlfb, struct urb *urb, size_t len)1926{1927 int ret;1928 1929 BUG_ON(len > dlfb->urbs.size);1930 1931 urb->transfer_buffer_length = len; /* set to actual payload len */1932 ret = usb_submit_urb(urb, GFP_KERNEL);1933 if (ret) {1934 dlfb_urb_completion(urb); /* because no one else will */1935 atomic_set(&dlfb->lost_pixels, 1);1936 dev_err(&dlfb->udev->dev, "submit urb error: %d\n", ret);1937 }1938 return ret;1939}1940 1941module_param(console, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);1942MODULE_PARM_DESC(console, "Allow fbcon to open framebuffer");1943 1944module_param(fb_defio, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);1945MODULE_PARM_DESC(fb_defio, "Page fault detection of mmap writes");1946 1947module_param(shadow, bool, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);1948MODULE_PARM_DESC(shadow, "Shadow vid mem. Disable to save mem but lose perf");1949 1950module_param(pixel_limit, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);1951MODULE_PARM_DESC(pixel_limit, "Force limit on max mode (in x*y pixels)");1952 1953MODULE_AUTHOR("Roberto De Ioris <roberto@unbit.it>, "1954 "Jaya Kumar <jayakumar.lkml@gmail.com>, "1955 "Bernie Thompson <bernie@plugable.com>");1956MODULE_DESCRIPTION("DisplayLink kernel framebuffer driver");1957MODULE_LICENSE("GPL");1958 1959