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1/*
2 * Copyright (C) 2012 Red Hat
3 *
4 * based in parts on udlfb.c:
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 * This file is subject to the terms and conditions of the GNU General Public
10 * License v2. See the file COPYING in the main directory of this archive for
11 * more details.
12 */
13#include <linux/module.h>
14#include <linux/slab.h>
15#include <linux/fb.h>
16
17#include "drmP.h"
18#include "drm.h"
19#include "drm_crtc.h"
20#include "drm_crtc_helper.h"
21#include "udl_drv.h"
22
23#include "drm_fb_helper.h"
24
25#define DL_DEFIO_WRITE_DELAY 5 /* fb_deferred_io.delay in jiffies */
26
27static int fb_defio = 1; /* Optionally enable experimental fb_defio mmap support */
28static int fb_bpp = 16;
29
30module_param(fb_bpp, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
31module_param(fb_defio, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
32
33struct udl_fbdev {
34 struct drm_fb_helper helper;
35 struct udl_framebuffer ufb;
36 struct list_head fbdev_list;
37 int fb_count;
38};
39
40#define DL_ALIGN_UP(x, a) ALIGN(x, a)
41#define DL_ALIGN_DOWN(x, a) ALIGN(x-(a-1), a)
42
43/** Read the red component (0..255) of a 32 bpp colour. */
44#define DLO_RGB_GETRED(col) (uint8_t)((col) & 0xFF)
45
46/** Read the green component (0..255) of a 32 bpp colour. */
47#define DLO_RGB_GETGRN(col) (uint8_t)(((col) >> 8) & 0xFF)
48
49/** Read the blue component (0..255) of a 32 bpp colour. */
50#define DLO_RGB_GETBLU(col) (uint8_t)(((col) >> 16) & 0xFF)
51
52/** Return red/green component of a 16 bpp colour number. */
53#define DLO_RG16(red, grn) (uint8_t)((((red) & 0xF8) | ((grn) >> 5)) & 0xFF)
54
55/** Return green/blue component of a 16 bpp colour number. */
56#define DLO_GB16(grn, blu) (uint8_t)(((((grn) & 0x1C) << 3) | ((blu) >> 3)) & 0xFF)
57
58/** Return 8 bpp colour number from red, green and blue components. */
59#define DLO_RGB8(red, grn, blu) ((((red) << 5) | (((grn) & 3) << 3) | ((blu) & 7)) & 0xFF)
60
61#if 0
62static uint8_t rgb8(uint32_t col)
63{
64 uint8_t red = DLO_RGB_GETRED(col);
65 uint8_t grn = DLO_RGB_GETGRN(col);
66 uint8_t blu = DLO_RGB_GETBLU(col);
67
68 return DLO_RGB8(red, grn, blu);
69}
70
71static uint16_t rgb16(uint32_t col)
72{
73 uint8_t red = DLO_RGB_GETRED(col);
74 uint8_t grn = DLO_RGB_GETGRN(col);
75 uint8_t blu = DLO_RGB_GETBLU(col);
76
77 return (DLO_RG16(red, grn) << 8) + DLO_GB16(grn, blu);
78}
79#endif
80
81/*
82 * NOTE: fb_defio.c is holding info->fbdefio.mutex
83 * Touching ANY framebuffer memory that triggers a page fault
84 * in fb_defio will cause a deadlock, when it also tries to
85 * grab the same mutex.
86 */
87static void udlfb_dpy_deferred_io(struct fb_info *info,
88 struct list_head *pagelist)
89{
90 struct page *cur;
91 struct fb_deferred_io *fbdefio = info->fbdefio;
92 struct udl_fbdev *ufbdev = info->par;
93 struct drm_device *dev = ufbdev->ufb.base.dev;
94 struct udl_device *udl = dev->dev_private;
95 struct urb *urb;
96 char *cmd;
97 cycles_t start_cycles, end_cycles;
98 int bytes_sent = 0;
99 int bytes_identical = 0;
100 int bytes_rendered = 0;
101
102 if (!fb_defio)
103 return;
104
105 start_cycles = get_cycles();
106
107 urb = udl_get_urb(dev);
108 if (!urb)
109 return;
110
111 cmd = urb->transfer_buffer;
112
113 /* walk the written page list and render each to device */
114 list_for_each_entry(cur, &fbdefio->pagelist, lru) {
115
116 if (udl_render_hline(dev, (ufbdev->ufb.base.bits_per_pixel / 8),
117 &urb, (char *) info->fix.smem_start,
118 &cmd, cur->index << PAGE_SHIFT,
119 PAGE_SIZE, &bytes_identical, &bytes_sent))
120 goto error;
121 bytes_rendered += PAGE_SIZE;
122 }
123
124 if (cmd > (char *) urb->transfer_buffer) {
125 /* Send partial buffer remaining before exiting */
126 int len = cmd - (char *) urb->transfer_buffer;
127 udl_submit_urb(dev, urb, len);
128 bytes_sent += len;
129 } else
130 udl_urb_completion(urb);
131
132error:
133 atomic_add(bytes_sent, &udl->bytes_sent);
134 atomic_add(bytes_identical, &udl->bytes_identical);
135 atomic_add(bytes_rendered, &udl->bytes_rendered);
136 end_cycles = get_cycles();
137 atomic_add(((unsigned int) ((end_cycles - start_cycles)
138 >> 10)), /* Kcycles */
139 &udl->cpu_kcycles_used);
140}
141
142int udl_handle_damage(struct udl_framebuffer *fb, int x, int y,
143 int width, int height)
144{
145 struct drm_device *dev = fb->base.dev;
146 struct udl_device *udl = dev->dev_private;
147 int i, ret;
148 char *cmd;
149 cycles_t start_cycles, end_cycles;
150 int bytes_sent = 0;
151 int bytes_identical = 0;
152 struct urb *urb;
153 int aligned_x;
154 int bpp = (fb->base.bits_per_pixel / 8);
155
156 if (!fb->active_16)
157 return 0;
158
159 if (!fb->obj->vmapping) {
160 ret = udl_gem_vmap(fb->obj);
161 if (ret == -ENOMEM) {
162 DRM_ERROR("failed to vmap fb\n");
163 return 0;
164 }
165 if (!fb->obj->vmapping) {
166 DRM_ERROR("failed to vmapping\n");
167 return 0;
168 }
169 }
170
171 start_cycles = get_cycles();
172
173 aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long));
174 width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long));
175 x = aligned_x;
176
177 if ((width <= 0) ||
178 (x + width > fb->base.width) ||
179 (y + height > fb->base.height))
180 return -EINVAL;
181
182 urb = udl_get_urb(dev);
183 if (!urb)
184 return 0;
185 cmd = urb->transfer_buffer;
186
187 for (i = y; i < y + height ; i++) {
188 const int line_offset = fb->base.pitches[0] * i;
189 const int byte_offset = line_offset + (x * bpp);
190
191 if (udl_render_hline(dev, bpp, &urb,
192 (char *) fb->obj->vmapping,
193 &cmd, byte_offset, width * bpp,
194 &bytes_identical, &bytes_sent))
195 goto error;
196 }
197
198 if (cmd > (char *) urb->transfer_buffer) {
199 /* Send partial buffer remaining before exiting */
200 int len = cmd - (char *) urb->transfer_buffer;
201 ret = udl_submit_urb(dev, urb, len);
202 bytes_sent += len;
203 } else
204 udl_urb_completion(urb);
205
206error:
207 atomic_add(bytes_sent, &udl->bytes_sent);
208 atomic_add(bytes_identical, &udl->bytes_identical);
209 atomic_add(width*height*bpp, &udl->bytes_rendered);
210 end_cycles = get_cycles();
211 atomic_add(((unsigned int) ((end_cycles - start_cycles)
212 >> 10)), /* Kcycles */
213 &udl->cpu_kcycles_used);
214
215 return 0;
216}
217
218static int udl_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
219{
220 unsigned long start = vma->vm_start;
221 unsigned long size = vma->vm_end - vma->vm_start;
222 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
223 unsigned long page, pos;
224
225 if (offset + size > info->fix.smem_len)
226 return -EINVAL;
227
228 pos = (unsigned long)info->fix.smem_start + offset;
229
230 pr_notice("mmap() framebuffer addr:%lu size:%lu\n",
231 pos, size);
232
233 while (size > 0) {
234 page = vmalloc_to_pfn((void *)pos);
235 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
236 return -EAGAIN;
237
238 start += PAGE_SIZE;
239 pos += PAGE_SIZE;
240 if (size > PAGE_SIZE)
241 size -= PAGE_SIZE;
242 else
243 size = 0;
244 }
245
246 vma->vm_flags |= VM_RESERVED; /* avoid to swap out this VMA */
247 return 0;
248}
249
250static void udl_fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
251{
252 struct udl_fbdev *ufbdev = info->par;
253
254 sys_fillrect(info, rect);
255
256 udl_handle_damage(&ufbdev->ufb, rect->dx, rect->dy, rect->width,
257 rect->height);
258}
259
260static void udl_fb_copyarea(struct fb_info *info, const struct fb_copyarea *region)
261{
262 struct udl_fbdev *ufbdev = info->par;
263
264 sys_copyarea(info, region);
265
266 udl_handle_damage(&ufbdev->ufb, region->dx, region->dy, region->width,
267 region->height);
268}
269
270static void udl_fb_imageblit(struct fb_info *info, const struct fb_image *image)
271{
272 struct udl_fbdev *ufbdev = info->par;
273
274 sys_imageblit(info, image);
275
276 udl_handle_damage(&ufbdev->ufb, image->dx, image->dy, image->width,
277 image->height);
278}
279
280/*
281 * It's common for several clients to have framebuffer open simultaneously.
282 * e.g. both fbcon and X. Makes things interesting.
283 * Assumes caller is holding info->lock (for open and release at least)
284 */
285static int udl_fb_open(struct fb_info *info, int user)
286{
287 struct udl_fbdev *ufbdev = info->par;
288 struct drm_device *dev = ufbdev->ufb.base.dev;
289 struct udl_device *udl = dev->dev_private;
290
291 /* If the USB device is gone, we don't accept new opens */
292 if (drm_device_is_unplugged(udl->ddev))
293 return -ENODEV;
294
295 ufbdev->fb_count++;
296
297 if (fb_defio && (info->fbdefio == NULL)) {
298 /* enable defio at last moment if not disabled by client */
299
300 struct fb_deferred_io *fbdefio;
301
302 fbdefio = kmalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);
303
304 if (fbdefio) {
305 fbdefio->delay = DL_DEFIO_WRITE_DELAY;
306 fbdefio->deferred_io = udlfb_dpy_deferred_io;
307 }
308
309 info->fbdefio = fbdefio;
310 fb_deferred_io_init(info);
311 }
312
313 pr_notice("open /dev/fb%d user=%d fb_info=%p count=%d\n",
314 info->node, user, info, ufbdev->fb_count);
315
316 return 0;
317}
318
319
320/*
321 * Assumes caller is holding info->lock mutex (for open and release at least)
322 */
323static int udl_fb_release(struct fb_info *info, int user)
324{
325 struct udl_fbdev *ufbdev = info->par;
326
327 ufbdev->fb_count--;
328
329 if ((ufbdev->fb_count == 0) && (info->fbdefio)) {
330 fb_deferred_io_cleanup(info);
331 kfree(info->fbdefio);
332 info->fbdefio = NULL;
333 info->fbops->fb_mmap = udl_fb_mmap;
334 }
335
336 pr_warn("released /dev/fb%d user=%d count=%d\n",
337 info->node, user, ufbdev->fb_count);
338
339 return 0;
340}
341
342static struct fb_ops udlfb_ops = {
343 .owner = THIS_MODULE,
344 .fb_check_var = drm_fb_helper_check_var,
345 .fb_set_par = drm_fb_helper_set_par,
346 .fb_fillrect = udl_fb_fillrect,
347 .fb_copyarea = udl_fb_copyarea,
348 .fb_imageblit = udl_fb_imageblit,
349 .fb_pan_display = drm_fb_helper_pan_display,
350 .fb_blank = drm_fb_helper_blank,
351 .fb_setcmap = drm_fb_helper_setcmap,
352 .fb_debug_enter = drm_fb_helper_debug_enter,
353 .fb_debug_leave = drm_fb_helper_debug_leave,
354 .fb_mmap = udl_fb_mmap,
355 .fb_open = udl_fb_open,
356 .fb_release = udl_fb_release,
357};
358
359void udl_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
360 u16 blue, int regno)
361{
362}
363
364void udl_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
365 u16 *blue, int regno)
366{
367 *red = 0;
368 *green = 0;
369 *blue = 0;
370}
371
372static int udl_user_framebuffer_dirty(struct drm_framebuffer *fb,
373 struct drm_file *file,
374 unsigned flags, unsigned color,
375 struct drm_clip_rect *clips,
376 unsigned num_clips)
377{
378 struct udl_framebuffer *ufb = to_udl_fb(fb);
379 int i;
380
381 if (!ufb->active_16)
382 return 0;
383
384 for (i = 0; i < num_clips; i++) {
385 udl_handle_damage(ufb, clips[i].x1, clips[i].y1,
386 clips[i].x2 - clips[i].x1,
387 clips[i].y2 - clips[i].y1);
388 }
389 return 0;
390}
391
392static void udl_user_framebuffer_destroy(struct drm_framebuffer *fb)
393{
394 struct udl_framebuffer *ufb = to_udl_fb(fb);
395
396 if (ufb->obj)
397 drm_gem_object_unreference_unlocked(&ufb->obj->base);
398
399 drm_framebuffer_cleanup(fb);
400 kfree(ufb);
401}
402
403static const struct drm_framebuffer_funcs udlfb_funcs = {
404 .destroy = udl_user_framebuffer_destroy,
405 .dirty = udl_user_framebuffer_dirty,
406 .create_handle = NULL,
407};
408
409
410static int
411udl_framebuffer_init(struct drm_device *dev,
412 struct udl_framebuffer *ufb,
413 struct drm_mode_fb_cmd2 *mode_cmd,
414 struct udl_gem_object *obj)
415{
416 int ret;
417
418 ufb->obj = obj;
419 ret = drm_framebuffer_init(dev, &ufb->base, &udlfb_funcs);
420 drm_helper_mode_fill_fb_struct(&ufb->base, mode_cmd);
421 return ret;
422}
423
424
425static int udlfb_create(struct udl_fbdev *ufbdev,
426 struct drm_fb_helper_surface_size *sizes)
427{
428 struct drm_device *dev = ufbdev->helper.dev;
429 struct fb_info *info;
430 struct device *device = &dev->usbdev->dev;
431 struct drm_framebuffer *fb;
432 struct drm_mode_fb_cmd2 mode_cmd;
433 struct udl_gem_object *obj;
434 uint32_t size;
435 int ret = 0;
436
437 if (sizes->surface_bpp == 24)
438 sizes->surface_bpp = 32;
439
440 mode_cmd.width = sizes->surface_width;
441 mode_cmd.height = sizes->surface_height;
442 mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
443
444 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
445 sizes->surface_depth);
446
447 size = mode_cmd.pitches[0] * mode_cmd.height;
448 size = ALIGN(size, PAGE_SIZE);
449
450 obj = udl_gem_alloc_object(dev, size);
451 if (!obj)
452 goto out;
453
454 ret = udl_gem_vmap(obj);
455 if (ret) {
456 DRM_ERROR("failed to vmap fb\n");
457 goto out_gfree;
458 }
459
460 info = framebuffer_alloc(0, device);
461 if (!info) {
462 ret = -ENOMEM;
463 goto out_gfree;
464 }
465 info->par = ufbdev;
466
467 ret = udl_framebuffer_init(dev, &ufbdev->ufb, &mode_cmd, obj);
468 if (ret)
469 goto out_gfree;
470
471 fb = &ufbdev->ufb.base;
472
473 ufbdev->helper.fb = fb;
474 ufbdev->helper.fbdev = info;
475
476 strcpy(info->fix.id, "udldrmfb");
477
478 info->screen_base = ufbdev->ufb.obj->vmapping;
479 info->fix.smem_len = size;
480 info->fix.smem_start = (unsigned long)ufbdev->ufb.obj->vmapping;
481
482 info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
483 info->fbops = &udlfb_ops;
484 drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
485 drm_fb_helper_fill_var(info, &ufbdev->helper, sizes->fb_width, sizes->fb_height);
486
487 ret = fb_alloc_cmap(&info->cmap, 256, 0);
488 if (ret) {
489 ret = -ENOMEM;
490 goto out_gfree;
491 }
492
493
494 DRM_DEBUG_KMS("allocated %dx%d vmal %p\n",
495 fb->width, fb->height,
496 ufbdev->ufb.obj->vmapping);
497
498 return ret;
499out_gfree:
500 drm_gem_object_unreference(&ufbdev->ufb.obj->base);
501out:
502 return ret;
503}
504
505static int udl_fb_find_or_create_single(struct drm_fb_helper *helper,
506 struct drm_fb_helper_surface_size *sizes)
507{
508 struct udl_fbdev *ufbdev = (struct udl_fbdev *)helper;
509 int new_fb = 0;
510 int ret;
511
512 if (!helper->fb) {
513 ret = udlfb_create(ufbdev, sizes);
514 if (ret)
515 return ret;
516
517 new_fb = 1;
518 }
519 return new_fb;
520}
521
522static struct drm_fb_helper_funcs udl_fb_helper_funcs = {
523 .gamma_set = udl_crtc_fb_gamma_set,
524 .gamma_get = udl_crtc_fb_gamma_get,
525 .fb_probe = udl_fb_find_or_create_single,
526};
527
528static void udl_fbdev_destroy(struct drm_device *dev,
529 struct udl_fbdev *ufbdev)
530{
531 struct fb_info *info;
532 if (ufbdev->helper.fbdev) {
533 info = ufbdev->helper.fbdev;
534 unregister_framebuffer(info);
535 if (info->cmap.len)
536 fb_dealloc_cmap(&info->cmap);
537 framebuffer_release(info);
538 }
539 drm_fb_helper_fini(&ufbdev->helper);
540 drm_framebuffer_cleanup(&ufbdev->ufb.base);
541 drm_gem_object_unreference_unlocked(&ufbdev->ufb.obj->base);
542}
543
544int udl_fbdev_init(struct drm_device *dev)
545{
546 struct udl_device *udl = dev->dev_private;
547 int bpp_sel = fb_bpp;
548 struct udl_fbdev *ufbdev;
549 int ret;
550
551 ufbdev = kzalloc(sizeof(struct udl_fbdev), GFP_KERNEL);
552 if (!ufbdev)
553 return -ENOMEM;
554
555 udl->fbdev = ufbdev;
556 ufbdev->helper.funcs = &udl_fb_helper_funcs;
557
558 ret = drm_fb_helper_init(dev, &ufbdev->helper,
559 1, 1);
560 if (ret) {
561 kfree(ufbdev);
562 return ret;
563
564 }
565
566 drm_fb_helper_single_add_all_connectors(&ufbdev->helper);
567 drm_fb_helper_initial_config(&ufbdev->helper, bpp_sel);
568 return 0;
569}
570
571void udl_fbdev_cleanup(struct drm_device *dev)
572{
573 struct udl_device *udl = dev->dev_private;
574 if (!udl->fbdev)
575 return;
576
577 udl_fbdev_destroy(dev, udl->fbdev);
578 kfree(udl->fbdev);
579 udl->fbdev = NULL;
580}
581
582void udl_fbdev_unplug(struct drm_device *dev)
583{
584 struct udl_device *udl = dev->dev_private;
585 struct udl_fbdev *ufbdev;
586 if (!udl->fbdev)
587 return;
588
589 ufbdev = udl->fbdev;
590 if (ufbdev->helper.fbdev) {
591 struct fb_info *info;
592 info = ufbdev->helper.fbdev;
593 unlink_framebuffer(info);
594 }
595}
596
597struct drm_framebuffer *
598udl_fb_user_fb_create(struct drm_device *dev,
599 struct drm_file *file,
600 struct drm_mode_fb_cmd2 *mode_cmd)
601{
602 struct drm_gem_object *obj;
603 struct udl_framebuffer *ufb;
604 int ret;
605 uint32_t size;
606
607 obj = drm_gem_object_lookup(dev, file, mode_cmd->handles[0]);
608 if (obj == NULL)
609 return ERR_PTR(-ENOENT);
610
611 size = mode_cmd->pitches[0] * mode_cmd->height;
612 size = ALIGN(size, PAGE_SIZE);
613
614 if (size > obj->size) {
615 DRM_ERROR("object size not sufficient for fb %d %zu %d %d\n", size, obj->size, mode_cmd->pitches[0], mode_cmd->height);
616 return ERR_PTR(-ENOMEM);
617 }
618
619 ufb = kzalloc(sizeof(*ufb), GFP_KERNEL);
620 if (ufb == NULL)
621 return ERR_PTR(-ENOMEM);
622
623 ret = udl_framebuffer_init(dev, ufb, mode_cmd, to_udl_bo(obj));
624 if (ret) {
625 kfree(ufb);
626 return ERR_PTR(-EINVAL);
627 }
628 return &ufb->base;
629}