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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#include <linux/dma-buf.h>
17
18#include <drm/drmP.h>
19#include <drm/drm_crtc.h>
20#include <drm/drm_crtc_helper.h>
21#include "udl_drv.h"
22
23#include <drm/drm_fb_helper.h>
24
25#define DL_DEFIO_WRITE_DELAY (HZ/20) /* fb_deferred_io.delay in jiffies */
26
27static int fb_defio = 0; /* 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 cur->index << PAGE_SHIFT,
120 PAGE_SIZE, &bytes_identical, &bytes_sent))
121 goto error;
122 bytes_rendered += PAGE_SIZE;
123 }
124
125 if (cmd > (char *) urb->transfer_buffer) {
126 /* Send partial buffer remaining before exiting */
127 int len = cmd - (char *) urb->transfer_buffer;
128 udl_submit_urb(dev, urb, len);
129 bytes_sent += len;
130 } else
131 udl_urb_completion(urb);
132
133error:
134 atomic_add(bytes_sent, &udl->bytes_sent);
135 atomic_add(bytes_identical, &udl->bytes_identical);
136 atomic_add(bytes_rendered, &udl->bytes_rendered);
137 end_cycles = get_cycles();
138 atomic_add(((unsigned int) ((end_cycles - start_cycles)
139 >> 10)), /* Kcycles */
140 &udl->cpu_kcycles_used);
141}
142
143int udl_handle_damage(struct udl_framebuffer *fb, int x, int y,
144 int width, int height)
145{
146 struct drm_device *dev = fb->base.dev;
147 struct udl_device *udl = dev->dev_private;
148 int i, ret;
149 char *cmd;
150 cycles_t start_cycles, end_cycles;
151 int bytes_sent = 0;
152 int bytes_identical = 0;
153 struct urb *urb;
154 int aligned_x;
155 int bpp = (fb->base.bits_per_pixel / 8);
156 int x2, y2;
157 bool store_for_later = false;
158 unsigned long flags;
159
160 if (!fb->active_16)
161 return 0;
162
163 if (!fb->obj->vmapping) {
164 ret = udl_gem_vmap(fb->obj);
165 if (ret == -ENOMEM) {
166 DRM_ERROR("failed to vmap fb\n");
167 return 0;
168 }
169 if (!fb->obj->vmapping) {
170 DRM_ERROR("failed to vmapping\n");
171 return 0;
172 }
173 }
174
175 aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long));
176 width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long));
177 x = aligned_x;
178
179 if ((width <= 0) ||
180 (x + width > fb->base.width) ||
181 (y + height > fb->base.height))
182 return -EINVAL;
183
184 /* if we are in atomic just store the info
185 can't test inside spin lock */
186 if (in_atomic())
187 store_for_later = true;
188
189 x2 = x + width - 1;
190 y2 = y + height - 1;
191
192 spin_lock_irqsave(&fb->dirty_lock, flags);
193
194 if (fb->y1 < y)
195 y = fb->y1;
196 if (fb->y2 > y2)
197 y2 = fb->y2;
198 if (fb->x1 < x)
199 x = fb->x1;
200 if (fb->x2 > x2)
201 x2 = fb->x2;
202
203 if (store_for_later) {
204 fb->x1 = x;
205 fb->x2 = x2;
206 fb->y1 = y;
207 fb->y2 = y2;
208 spin_unlock_irqrestore(&fb->dirty_lock, flags);
209 return 0;
210 }
211
212 fb->x1 = fb->y1 = INT_MAX;
213 fb->x2 = fb->y2 = 0;
214
215 spin_unlock_irqrestore(&fb->dirty_lock, flags);
216 start_cycles = get_cycles();
217
218 urb = udl_get_urb(dev);
219 if (!urb)
220 return 0;
221 cmd = urb->transfer_buffer;
222
223 for (i = y; i <= y2 ; i++) {
224 const int line_offset = fb->base.pitches[0] * i;
225 const int byte_offset = line_offset + (x * bpp);
226 const int dev_byte_offset = (fb->base.width * bpp * i) + (x * bpp);
227 if (udl_render_hline(dev, bpp, &urb,
228 (char *) fb->obj->vmapping,
229 &cmd, byte_offset, dev_byte_offset,
230 (x2 - x + 1) * bpp,
231 &bytes_identical, &bytes_sent))
232 goto error;
233 }
234
235 if (cmd > (char *) urb->transfer_buffer) {
236 /* Send partial buffer remaining before exiting */
237 int len = cmd - (char *) urb->transfer_buffer;
238 ret = udl_submit_urb(dev, urb, len);
239 bytes_sent += len;
240 } else
241 udl_urb_completion(urb);
242
243error:
244 atomic_add(bytes_sent, &udl->bytes_sent);
245 atomic_add(bytes_identical, &udl->bytes_identical);
246 atomic_add(width*height*bpp, &udl->bytes_rendered);
247 end_cycles = get_cycles();
248 atomic_add(((unsigned int) ((end_cycles - start_cycles)
249 >> 10)), /* Kcycles */
250 &udl->cpu_kcycles_used);
251
252 return 0;
253}
254
255static int udl_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
256{
257 unsigned long start = vma->vm_start;
258 unsigned long size = vma->vm_end - vma->vm_start;
259 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
260 unsigned long page, pos;
261
262 if (offset + size > info->fix.smem_len)
263 return -EINVAL;
264
265 pos = (unsigned long)info->fix.smem_start + offset;
266
267 pr_notice("mmap() framebuffer addr:%lu size:%lu\n",
268 pos, size);
269
270 while (size > 0) {
271 page = vmalloc_to_pfn((void *)pos);
272 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
273 return -EAGAIN;
274
275 start += PAGE_SIZE;
276 pos += PAGE_SIZE;
277 if (size > PAGE_SIZE)
278 size -= PAGE_SIZE;
279 else
280 size = 0;
281 }
282
283 /* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */
284 return 0;
285}
286
287static void udl_fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
288{
289 struct udl_fbdev *ufbdev = info->par;
290
291 sys_fillrect(info, rect);
292
293 udl_handle_damage(&ufbdev->ufb, rect->dx, rect->dy, rect->width,
294 rect->height);
295}
296
297static void udl_fb_copyarea(struct fb_info *info, const struct fb_copyarea *region)
298{
299 struct udl_fbdev *ufbdev = info->par;
300
301 sys_copyarea(info, region);
302
303 udl_handle_damage(&ufbdev->ufb, region->dx, region->dy, region->width,
304 region->height);
305}
306
307static void udl_fb_imageblit(struct fb_info *info, const struct fb_image *image)
308{
309 struct udl_fbdev *ufbdev = info->par;
310
311 sys_imageblit(info, image);
312
313 udl_handle_damage(&ufbdev->ufb, image->dx, image->dy, image->width,
314 image->height);
315}
316
317/*
318 * It's common for several clients to have framebuffer open simultaneously.
319 * e.g. both fbcon and X. Makes things interesting.
320 * Assumes caller is holding info->lock (for open and release at least)
321 */
322static int udl_fb_open(struct fb_info *info, int user)
323{
324 struct udl_fbdev *ufbdev = info->par;
325 struct drm_device *dev = ufbdev->ufb.base.dev;
326 struct udl_device *udl = dev->dev_private;
327
328 /* If the USB device is gone, we don't accept new opens */
329 if (drm_device_is_unplugged(udl->ddev))
330 return -ENODEV;
331
332 ufbdev->fb_count++;
333
334 if (fb_defio && (info->fbdefio == NULL)) {
335 /* enable defio at last moment if not disabled by client */
336
337 struct fb_deferred_io *fbdefio;
338
339 fbdefio = kmalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);
340
341 if (fbdefio) {
342 fbdefio->delay = DL_DEFIO_WRITE_DELAY;
343 fbdefio->deferred_io = udlfb_dpy_deferred_io;
344 }
345
346 info->fbdefio = fbdefio;
347 fb_deferred_io_init(info);
348 }
349
350 pr_notice("open /dev/fb%d user=%d fb_info=%p count=%d\n",
351 info->node, user, info, ufbdev->fb_count);
352
353 return 0;
354}
355
356
357/*
358 * Assumes caller is holding info->lock mutex (for open and release at least)
359 */
360static int udl_fb_release(struct fb_info *info, int user)
361{
362 struct udl_fbdev *ufbdev = info->par;
363
364 ufbdev->fb_count--;
365
366 if ((ufbdev->fb_count == 0) && (info->fbdefio)) {
367 fb_deferred_io_cleanup(info);
368 kfree(info->fbdefio);
369 info->fbdefio = NULL;
370 info->fbops->fb_mmap = udl_fb_mmap;
371 }
372
373 pr_warn("released /dev/fb%d user=%d count=%d\n",
374 info->node, user, ufbdev->fb_count);
375
376 return 0;
377}
378
379static struct fb_ops udlfb_ops = {
380 .owner = THIS_MODULE,
381 .fb_check_var = drm_fb_helper_check_var,
382 .fb_set_par = drm_fb_helper_set_par,
383 .fb_fillrect = udl_fb_fillrect,
384 .fb_copyarea = udl_fb_copyarea,
385 .fb_imageblit = udl_fb_imageblit,
386 .fb_pan_display = drm_fb_helper_pan_display,
387 .fb_blank = drm_fb_helper_blank,
388 .fb_setcmap = drm_fb_helper_setcmap,
389 .fb_debug_enter = drm_fb_helper_debug_enter,
390 .fb_debug_leave = drm_fb_helper_debug_leave,
391 .fb_mmap = udl_fb_mmap,
392 .fb_open = udl_fb_open,
393 .fb_release = udl_fb_release,
394};
395
396static int udl_user_framebuffer_dirty(struct drm_framebuffer *fb,
397 struct drm_file *file,
398 unsigned flags, unsigned color,
399 struct drm_clip_rect *clips,
400 unsigned num_clips)
401{
402 struct udl_framebuffer *ufb = to_udl_fb(fb);
403 int i;
404 int ret = 0;
405
406 drm_modeset_lock_all(fb->dev);
407
408 if (!ufb->active_16)
409 goto unlock;
410
411 if (ufb->obj->base.import_attach) {
412 ret = dma_buf_begin_cpu_access(ufb->obj->base.import_attach->dmabuf,
413 0, ufb->obj->base.size,
414 DMA_FROM_DEVICE);
415 if (ret)
416 goto unlock;
417 }
418
419 for (i = 0; i < num_clips; i++) {
420 ret = udl_handle_damage(ufb, clips[i].x1, clips[i].y1,
421 clips[i].x2 - clips[i].x1,
422 clips[i].y2 - clips[i].y1);
423 if (ret)
424 break;
425 }
426
427 if (ufb->obj->base.import_attach) {
428 dma_buf_end_cpu_access(ufb->obj->base.import_attach->dmabuf,
429 0, ufb->obj->base.size,
430 DMA_FROM_DEVICE);
431 }
432
433 unlock:
434 drm_modeset_unlock_all(fb->dev);
435
436 return ret;
437}
438
439static void udl_user_framebuffer_destroy(struct drm_framebuffer *fb)
440{
441 struct udl_framebuffer *ufb = to_udl_fb(fb);
442
443 if (ufb->obj)
444 drm_gem_object_unreference_unlocked(&ufb->obj->base);
445
446 drm_framebuffer_cleanup(fb);
447 kfree(ufb);
448}
449
450static const struct drm_framebuffer_funcs udlfb_funcs = {
451 .destroy = udl_user_framebuffer_destroy,
452 .dirty = udl_user_framebuffer_dirty,
453};
454
455
456static int
457udl_framebuffer_init(struct drm_device *dev,
458 struct udl_framebuffer *ufb,
459 struct drm_mode_fb_cmd2 *mode_cmd,
460 struct udl_gem_object *obj)
461{
462 int ret;
463
464 spin_lock_init(&ufb->dirty_lock);
465 ufb->obj = obj;
466 drm_helper_mode_fill_fb_struct(&ufb->base, mode_cmd);
467 ret = drm_framebuffer_init(dev, &ufb->base, &udlfb_funcs);
468 return ret;
469}
470
471
472static int udlfb_create(struct drm_fb_helper *helper,
473 struct drm_fb_helper_surface_size *sizes)
474{
475 struct udl_fbdev *ufbdev = (struct udl_fbdev *)helper;
476 struct drm_device *dev = ufbdev->helper.dev;
477 struct fb_info *info;
478 struct device *device = dev->dev;
479 struct drm_framebuffer *fb;
480 struct drm_mode_fb_cmd2 mode_cmd;
481 struct udl_gem_object *obj;
482 uint32_t size;
483 int ret = 0;
484
485 if (sizes->surface_bpp == 24)
486 sizes->surface_bpp = 32;
487
488 mode_cmd.width = sizes->surface_width;
489 mode_cmd.height = sizes->surface_height;
490 mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
491
492 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
493 sizes->surface_depth);
494
495 size = mode_cmd.pitches[0] * mode_cmd.height;
496 size = ALIGN(size, PAGE_SIZE);
497
498 obj = udl_gem_alloc_object(dev, size);
499 if (!obj)
500 goto out;
501
502 ret = udl_gem_vmap(obj);
503 if (ret) {
504 DRM_ERROR("failed to vmap fb\n");
505 goto out_gfree;
506 }
507
508 info = framebuffer_alloc(0, device);
509 if (!info) {
510 ret = -ENOMEM;
511 goto out_gfree;
512 }
513 info->par = ufbdev;
514
515 ret = udl_framebuffer_init(dev, &ufbdev->ufb, &mode_cmd, obj);
516 if (ret)
517 goto out_gfree;
518
519 fb = &ufbdev->ufb.base;
520
521 ufbdev->helper.fb = fb;
522 ufbdev->helper.fbdev = info;
523
524 strcpy(info->fix.id, "udldrmfb");
525
526 info->screen_base = ufbdev->ufb.obj->vmapping;
527 info->fix.smem_len = size;
528 info->fix.smem_start = (unsigned long)ufbdev->ufb.obj->vmapping;
529
530 info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
531 info->fbops = &udlfb_ops;
532 drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
533 drm_fb_helper_fill_var(info, &ufbdev->helper, sizes->fb_width, sizes->fb_height);
534
535 ret = fb_alloc_cmap(&info->cmap, 256, 0);
536 if (ret) {
537 ret = -ENOMEM;
538 goto out_gfree;
539 }
540
541
542 DRM_DEBUG_KMS("allocated %dx%d vmal %p\n",
543 fb->width, fb->height,
544 ufbdev->ufb.obj->vmapping);
545
546 return ret;
547out_gfree:
548 drm_gem_object_unreference(&ufbdev->ufb.obj->base);
549out:
550 return ret;
551}
552
553static struct drm_fb_helper_funcs udl_fb_helper_funcs = {
554 .fb_probe = udlfb_create,
555};
556
557static void udl_fbdev_destroy(struct drm_device *dev,
558 struct udl_fbdev *ufbdev)
559{
560 struct fb_info *info;
561 if (ufbdev->helper.fbdev) {
562 info = ufbdev->helper.fbdev;
563 unregister_framebuffer(info);
564 if (info->cmap.len)
565 fb_dealloc_cmap(&info->cmap);
566 framebuffer_release(info);
567 }
568 drm_fb_helper_fini(&ufbdev->helper);
569 drm_framebuffer_unregister_private(&ufbdev->ufb.base);
570 drm_framebuffer_cleanup(&ufbdev->ufb.base);
571 drm_gem_object_unreference_unlocked(&ufbdev->ufb.obj->base);
572}
573
574int udl_fbdev_init(struct drm_device *dev)
575{
576 struct udl_device *udl = dev->dev_private;
577 int bpp_sel = fb_bpp;
578 struct udl_fbdev *ufbdev;
579 int ret;
580
581 ufbdev = kzalloc(sizeof(struct udl_fbdev), GFP_KERNEL);
582 if (!ufbdev)
583 return -ENOMEM;
584
585 udl->fbdev = ufbdev;
586 ufbdev->helper.funcs = &udl_fb_helper_funcs;
587
588 ret = drm_fb_helper_init(dev, &ufbdev->helper,
589 1, 1);
590 if (ret) {
591 kfree(ufbdev);
592 return ret;
593
594 }
595
596 drm_fb_helper_single_add_all_connectors(&ufbdev->helper);
597
598 /* disable all the possible outputs/crtcs before entering KMS mode */
599 drm_helper_disable_unused_functions(dev);
600
601 drm_fb_helper_initial_config(&ufbdev->helper, bpp_sel);
602 return 0;
603}
604
605void udl_fbdev_cleanup(struct drm_device *dev)
606{
607 struct udl_device *udl = dev->dev_private;
608 if (!udl->fbdev)
609 return;
610
611 udl_fbdev_destroy(dev, udl->fbdev);
612 kfree(udl->fbdev);
613 udl->fbdev = NULL;
614}
615
616void udl_fbdev_unplug(struct drm_device *dev)
617{
618 struct udl_device *udl = dev->dev_private;
619 struct udl_fbdev *ufbdev;
620 if (!udl->fbdev)
621 return;
622
623 ufbdev = udl->fbdev;
624 if (ufbdev->helper.fbdev) {
625 struct fb_info *info;
626 info = ufbdev->helper.fbdev;
627 unlink_framebuffer(info);
628 }
629}
630
631struct drm_framebuffer *
632udl_fb_user_fb_create(struct drm_device *dev,
633 struct drm_file *file,
634 struct drm_mode_fb_cmd2 *mode_cmd)
635{
636 struct drm_gem_object *obj;
637 struct udl_framebuffer *ufb;
638 int ret;
639 uint32_t size;
640
641 obj = drm_gem_object_lookup(dev, file, mode_cmd->handles[0]);
642 if (obj == NULL)
643 return ERR_PTR(-ENOENT);
644
645 size = mode_cmd->pitches[0] * mode_cmd->height;
646 size = ALIGN(size, PAGE_SIZE);
647
648 if (size > obj->size) {
649 DRM_ERROR("object size not sufficient for fb %d %zu %d %d\n", size, obj->size, mode_cmd->pitches[0], mode_cmd->height);
650 return ERR_PTR(-ENOMEM);
651 }
652
653 ufb = kzalloc(sizeof(*ufb), GFP_KERNEL);
654 if (ufb == NULL)
655 return ERR_PTR(-ENOMEM);
656
657 ret = udl_framebuffer_init(dev, ufb, mode_cmd, to_udl_bo(obj));
658 if (ret) {
659 kfree(ufb);
660 return ERR_PTR(-EINVAL);
661 }
662 return &ufb->base;
663}