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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 int fb_count;
37};
38
39#define DL_ALIGN_UP(x, a) ALIGN(x, a)
40#define DL_ALIGN_DOWN(x, a) ALIGN(x-(a-1), a)
41
42/** Read the red component (0..255) of a 32 bpp colour. */
43#define DLO_RGB_GETRED(col) (uint8_t)((col) & 0xFF)
44
45/** Read the green component (0..255) of a 32 bpp colour. */
46#define DLO_RGB_GETGRN(col) (uint8_t)(((col) >> 8) & 0xFF)
47
48/** Read the blue component (0..255) of a 32 bpp colour. */
49#define DLO_RGB_GETBLU(col) (uint8_t)(((col) >> 16) & 0xFF)
50
51/** Return red/green component of a 16 bpp colour number. */
52#define DLO_RG16(red, grn) (uint8_t)((((red) & 0xF8) | ((grn) >> 5)) & 0xFF)
53
54/** Return green/blue component of a 16 bpp colour number. */
55#define DLO_GB16(grn, blu) (uint8_t)(((((grn) & 0x1C) << 3) | ((blu) >> 3)) & 0xFF)
56
57/** Return 8 bpp colour number from red, green and blue components. */
58#define DLO_RGB8(red, grn, blu) ((((red) << 5) | (((grn) & 3) << 3) | ((blu) & 7)) & 0xFF)
59
60#if 0
61static uint8_t rgb8(uint32_t col)
62{
63 uint8_t red = DLO_RGB_GETRED(col);
64 uint8_t grn = DLO_RGB_GETGRN(col);
65 uint8_t blu = DLO_RGB_GETBLU(col);
66
67 return DLO_RGB8(red, grn, blu);
68}
69
70static uint16_t rgb16(uint32_t col)
71{
72 uint8_t red = DLO_RGB_GETRED(col);
73 uint8_t grn = DLO_RGB_GETGRN(col);
74 uint8_t blu = DLO_RGB_GETBLU(col);
75
76 return (DLO_RG16(red, grn) << 8) + DLO_GB16(grn, blu);
77}
78#endif
79
80/*
81 * NOTE: fb_defio.c is holding info->fbdefio.mutex
82 * Touching ANY framebuffer memory that triggers a page fault
83 * in fb_defio will cause a deadlock, when it also tries to
84 * grab the same mutex.
85 */
86static void udlfb_dpy_deferred_io(struct fb_info *info,
87 struct list_head *pagelist)
88{
89 struct page *cur;
90 struct fb_deferred_io *fbdefio = info->fbdefio;
91 struct udl_fbdev *ufbdev = info->par;
92 struct drm_device *dev = ufbdev->ufb.base.dev;
93 struct udl_device *udl = dev->dev_private;
94 struct urb *urb;
95 char *cmd;
96 cycles_t start_cycles, end_cycles;
97 int bytes_sent = 0;
98 int bytes_identical = 0;
99 int bytes_rendered = 0;
100
101 if (!fb_defio)
102 return;
103
104 start_cycles = get_cycles();
105
106 urb = udl_get_urb(dev);
107 if (!urb)
108 return;
109
110 cmd = urb->transfer_buffer;
111
112 /* walk the written page list and render each to device */
113 list_for_each_entry(cur, &fbdefio->pagelist, lru) {
114
115 if (udl_render_hline(dev, (ufbdev->ufb.base.bits_per_pixel / 8),
116 &urb, (char *) info->fix.smem_start,
117 &cmd, cur->index << PAGE_SHIFT,
118 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 int x2, y2;
156 bool store_for_later = false;
157 unsigned long flags;
158
159 if (!fb->active_16)
160 return 0;
161
162 if (!fb->obj->vmapping) {
163 ret = udl_gem_vmap(fb->obj);
164 if (ret == -ENOMEM) {
165 DRM_ERROR("failed to vmap fb\n");
166 return 0;
167 }
168 if (!fb->obj->vmapping) {
169 DRM_ERROR("failed to vmapping\n");
170 return 0;
171 }
172 }
173
174 aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long));
175 width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long));
176 x = aligned_x;
177
178 if ((width <= 0) ||
179 (x + width > fb->base.width) ||
180 (y + height > fb->base.height))
181 return -EINVAL;
182
183 /* if we are in atomic just store the info
184 can't test inside spin lock */
185 if (in_atomic())
186 store_for_later = true;
187
188 x2 = x + width - 1;
189 y2 = y + height - 1;
190
191 spin_lock_irqsave(&fb->dirty_lock, flags);
192
193 if (fb->y1 < y)
194 y = fb->y1;
195 if (fb->y2 > y2)
196 y2 = fb->y2;
197 if (fb->x1 < x)
198 x = fb->x1;
199 if (fb->x2 > x2)
200 x2 = fb->x2;
201
202 if (store_for_later) {
203 fb->x1 = x;
204 fb->x2 = x2;
205 fb->y1 = y;
206 fb->y2 = y2;
207 spin_unlock_irqrestore(&fb->dirty_lock, flags);
208 return 0;
209 }
210
211 fb->x1 = fb->y1 = INT_MAX;
212 fb->x2 = fb->y2 = 0;
213
214 spin_unlock_irqrestore(&fb->dirty_lock, flags);
215 start_cycles = get_cycles();
216
217 urb = udl_get_urb(dev);
218 if (!urb)
219 return 0;
220 cmd = urb->transfer_buffer;
221
222 for (i = y; i <= y2 ; i++) {
223 const int line_offset = fb->base.pitches[0] * i;
224 const int byte_offset = line_offset + (x * bpp);
225 const int dev_byte_offset = (fb->base.width * bpp * i) + (x * bpp);
226 if (udl_render_hline(dev, bpp, &urb,
227 (char *) fb->obj->vmapping,
228 &cmd, byte_offset, dev_byte_offset,
229 (x2 - x + 1) * bpp,
230 &bytes_identical, &bytes_sent))
231 goto error;
232 }
233
234 if (cmd > (char *) urb->transfer_buffer) {
235 /* Send partial buffer remaining before exiting */
236 int len = cmd - (char *) urb->transfer_buffer;
237 ret = udl_submit_urb(dev, urb, len);
238 bytes_sent += len;
239 } else
240 udl_urb_completion(urb);
241
242error:
243 atomic_add(bytes_sent, &udl->bytes_sent);
244 atomic_add(bytes_identical, &udl->bytes_identical);
245 atomic_add(width*height*bpp, &udl->bytes_rendered);
246 end_cycles = get_cycles();
247 atomic_add(((unsigned int) ((end_cycles - start_cycles)
248 >> 10)), /* Kcycles */
249 &udl->cpu_kcycles_used);
250
251 return 0;
252}
253
254static int udl_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
255{
256 unsigned long start = vma->vm_start;
257 unsigned long size = vma->vm_end - vma->vm_start;
258 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
259 unsigned long page, pos;
260
261 if (offset + size > info->fix.smem_len)
262 return -EINVAL;
263
264 pos = (unsigned long)info->fix.smem_start + offset;
265
266 pr_notice("mmap() framebuffer addr:%lu size:%lu\n",
267 pos, size);
268
269 while (size > 0) {
270 page = vmalloc_to_pfn((void *)pos);
271 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
272 return -EAGAIN;
273
274 start += PAGE_SIZE;
275 pos += PAGE_SIZE;
276 if (size > PAGE_SIZE)
277 size -= PAGE_SIZE;
278 else
279 size = 0;
280 }
281
282 /* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */
283 return 0;
284}
285
286static void udl_fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
287{
288 struct udl_fbdev *ufbdev = info->par;
289
290 drm_fb_helper_sys_fillrect(info, rect);
291
292 udl_handle_damage(&ufbdev->ufb, rect->dx, rect->dy, rect->width,
293 rect->height);
294}
295
296static void udl_fb_copyarea(struct fb_info *info, const struct fb_copyarea *region)
297{
298 struct udl_fbdev *ufbdev = info->par;
299
300 drm_fb_helper_sys_copyarea(info, region);
301
302 udl_handle_damage(&ufbdev->ufb, region->dx, region->dy, region->width,
303 region->height);
304}
305
306static void udl_fb_imageblit(struct fb_info *info, const struct fb_image *image)
307{
308 struct udl_fbdev *ufbdev = info->par;
309
310 drm_fb_helper_sys_imageblit(info, image);
311
312 udl_handle_damage(&ufbdev->ufb, image->dx, image->dy, image->width,
313 image->height);
314}
315
316/*
317 * It's common for several clients to have framebuffer open simultaneously.
318 * e.g. both fbcon and X. Makes things interesting.
319 * Assumes caller is holding info->lock (for open and release at least)
320 */
321static int udl_fb_open(struct fb_info *info, int user)
322{
323 struct udl_fbdev *ufbdev = info->par;
324 struct drm_device *dev = ufbdev->ufb.base.dev;
325 struct udl_device *udl = dev->dev_private;
326
327 /* If the USB device is gone, we don't accept new opens */
328 if (drm_device_is_unplugged(udl->ddev))
329 return -ENODEV;
330
331 ufbdev->fb_count++;
332
333 if (fb_defio && (info->fbdefio == NULL)) {
334 /* enable defio at last moment if not disabled by client */
335
336 struct fb_deferred_io *fbdefio;
337
338 fbdefio = kmalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);
339
340 if (fbdefio) {
341 fbdefio->delay = DL_DEFIO_WRITE_DELAY;
342 fbdefio->deferred_io = udlfb_dpy_deferred_io;
343 }
344
345 info->fbdefio = fbdefio;
346 fb_deferred_io_init(info);
347 }
348
349 pr_notice("open /dev/fb%d user=%d fb_info=%p count=%d\n",
350 info->node, user, info, ufbdev->fb_count);
351
352 return 0;
353}
354
355
356/*
357 * Assumes caller is holding info->lock mutex (for open and release at least)
358 */
359static int udl_fb_release(struct fb_info *info, int user)
360{
361 struct udl_fbdev *ufbdev = info->par;
362
363 ufbdev->fb_count--;
364
365 if ((ufbdev->fb_count == 0) && (info->fbdefio)) {
366 fb_deferred_io_cleanup(info);
367 kfree(info->fbdefio);
368 info->fbdefio = NULL;
369 info->fbops->fb_mmap = udl_fb_mmap;
370 }
371
372 pr_warn("released /dev/fb%d user=%d count=%d\n",
373 info->node, user, ufbdev->fb_count);
374
375 return 0;
376}
377
378static struct fb_ops udlfb_ops = {
379 .owner = THIS_MODULE,
380 .fb_check_var = drm_fb_helper_check_var,
381 .fb_set_par = drm_fb_helper_set_par,
382 .fb_fillrect = udl_fb_fillrect,
383 .fb_copyarea = udl_fb_copyarea,
384 .fb_imageblit = udl_fb_imageblit,
385 .fb_pan_display = drm_fb_helper_pan_display,
386 .fb_blank = drm_fb_helper_blank,
387 .fb_setcmap = drm_fb_helper_setcmap,
388 .fb_debug_enter = drm_fb_helper_debug_enter,
389 .fb_debug_leave = drm_fb_helper_debug_leave,
390 .fb_mmap = udl_fb_mmap,
391 .fb_open = udl_fb_open,
392 .fb_release = udl_fb_release,
393};
394
395static int udl_user_framebuffer_dirty(struct drm_framebuffer *fb,
396 struct drm_file *file,
397 unsigned flags, unsigned color,
398 struct drm_clip_rect *clips,
399 unsigned num_clips)
400{
401 struct udl_framebuffer *ufb = to_udl_fb(fb);
402 int i;
403 int ret = 0;
404
405 drm_modeset_lock_all(fb->dev);
406
407 if (!ufb->active_16)
408 goto unlock;
409
410 if (ufb->obj->base.import_attach) {
411 ret = dma_buf_begin_cpu_access(ufb->obj->base.import_attach->dmabuf,
412 DMA_FROM_DEVICE);
413 if (ret)
414 goto unlock;
415 }
416
417 for (i = 0; i < num_clips; i++) {
418 ret = udl_handle_damage(ufb, clips[i].x1, clips[i].y1,
419 clips[i].x2 - clips[i].x1,
420 clips[i].y2 - clips[i].y1);
421 if (ret)
422 break;
423 }
424
425 if (ufb->obj->base.import_attach) {
426 ret = dma_buf_end_cpu_access(ufb->obj->base.import_attach->dmabuf,
427 DMA_FROM_DEVICE);
428 }
429
430 unlock:
431 drm_modeset_unlock_all(fb->dev);
432
433 return ret;
434}
435
436static void udl_user_framebuffer_destroy(struct drm_framebuffer *fb)
437{
438 struct udl_framebuffer *ufb = to_udl_fb(fb);
439
440 if (ufb->obj)
441 drm_gem_object_unreference_unlocked(&ufb->obj->base);
442
443 drm_framebuffer_cleanup(fb);
444 kfree(ufb);
445}
446
447static const struct drm_framebuffer_funcs udlfb_funcs = {
448 .destroy = udl_user_framebuffer_destroy,
449 .dirty = udl_user_framebuffer_dirty,
450};
451
452
453static int
454udl_framebuffer_init(struct drm_device *dev,
455 struct udl_framebuffer *ufb,
456 const struct drm_mode_fb_cmd2 *mode_cmd,
457 struct udl_gem_object *obj)
458{
459 int ret;
460
461 spin_lock_init(&ufb->dirty_lock);
462 ufb->obj = obj;
463 drm_helper_mode_fill_fb_struct(&ufb->base, mode_cmd);
464 ret = drm_framebuffer_init(dev, &ufb->base, &udlfb_funcs);
465 return ret;
466}
467
468
469static int udlfb_create(struct drm_fb_helper *helper,
470 struct drm_fb_helper_surface_size *sizes)
471{
472 struct udl_fbdev *ufbdev =
473 container_of(helper, struct udl_fbdev, helper);
474 struct drm_device *dev = ufbdev->helper.dev;
475 struct fb_info *info;
476 struct drm_framebuffer *fb;
477 struct drm_mode_fb_cmd2 mode_cmd;
478 struct udl_gem_object *obj;
479 uint32_t size;
480 int ret = 0;
481
482 if (sizes->surface_bpp == 24)
483 sizes->surface_bpp = 32;
484
485 mode_cmd.width = sizes->surface_width;
486 mode_cmd.height = sizes->surface_height;
487 mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
488
489 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
490 sizes->surface_depth);
491
492 size = mode_cmd.pitches[0] * mode_cmd.height;
493 size = ALIGN(size, PAGE_SIZE);
494
495 obj = udl_gem_alloc_object(dev, size);
496 if (!obj)
497 goto out;
498
499 ret = udl_gem_vmap(obj);
500 if (ret) {
501 DRM_ERROR("failed to vmap fb\n");
502 goto out_gfree;
503 }
504
505 info = drm_fb_helper_alloc_fbi(helper);
506 if (IS_ERR(info)) {
507 ret = PTR_ERR(info);
508 goto out_gfree;
509 }
510 info->par = ufbdev;
511
512 ret = udl_framebuffer_init(dev, &ufbdev->ufb, &mode_cmd, obj);
513 if (ret)
514 goto out_destroy_fbi;
515
516 fb = &ufbdev->ufb.base;
517
518 ufbdev->helper.fb = fb;
519
520 strcpy(info->fix.id, "udldrmfb");
521
522 info->screen_base = ufbdev->ufb.obj->vmapping;
523 info->fix.smem_len = size;
524 info->fix.smem_start = (unsigned long)ufbdev->ufb.obj->vmapping;
525
526 info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
527 info->fbops = &udlfb_ops;
528 drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
529 drm_fb_helper_fill_var(info, &ufbdev->helper, sizes->fb_width, sizes->fb_height);
530
531 DRM_DEBUG_KMS("allocated %dx%d vmal %p\n",
532 fb->width, fb->height,
533 ufbdev->ufb.obj->vmapping);
534
535 return ret;
536out_destroy_fbi:
537 drm_fb_helper_release_fbi(helper);
538out_gfree:
539 drm_gem_object_unreference_unlocked(&ufbdev->ufb.obj->base);
540out:
541 return ret;
542}
543
544static const struct drm_fb_helper_funcs udl_fb_helper_funcs = {
545 .fb_probe = udlfb_create,
546};
547
548static void udl_fbdev_destroy(struct drm_device *dev,
549 struct udl_fbdev *ufbdev)
550{
551 drm_fb_helper_unregister_fbi(&ufbdev->helper);
552 drm_fb_helper_release_fbi(&ufbdev->helper);
553 drm_fb_helper_fini(&ufbdev->helper);
554 drm_framebuffer_unregister_private(&ufbdev->ufb.base);
555 drm_framebuffer_cleanup(&ufbdev->ufb.base);
556 drm_gem_object_unreference_unlocked(&ufbdev->ufb.obj->base);
557}
558
559int udl_fbdev_init(struct drm_device *dev)
560{
561 struct udl_device *udl = dev->dev_private;
562 int bpp_sel = fb_bpp;
563 struct udl_fbdev *ufbdev;
564 int ret;
565
566 ufbdev = kzalloc(sizeof(struct udl_fbdev), GFP_KERNEL);
567 if (!ufbdev)
568 return -ENOMEM;
569
570 udl->fbdev = ufbdev;
571
572 drm_fb_helper_prepare(dev, &ufbdev->helper, &udl_fb_helper_funcs);
573
574 ret = drm_fb_helper_init(dev, &ufbdev->helper,
575 1, 1);
576 if (ret)
577 goto free;
578
579 ret = drm_fb_helper_single_add_all_connectors(&ufbdev->helper);
580 if (ret)
581 goto fini;
582
583 /* disable all the possible outputs/crtcs before entering KMS mode */
584 drm_helper_disable_unused_functions(dev);
585
586 ret = drm_fb_helper_initial_config(&ufbdev->helper, bpp_sel);
587 if (ret)
588 goto fini;
589
590 return 0;
591
592fini:
593 drm_fb_helper_fini(&ufbdev->helper);
594free:
595 kfree(ufbdev);
596 return ret;
597}
598
599void udl_fbdev_cleanup(struct drm_device *dev)
600{
601 struct udl_device *udl = dev->dev_private;
602 if (!udl->fbdev)
603 return;
604
605 udl_fbdev_destroy(dev, udl->fbdev);
606 kfree(udl->fbdev);
607 udl->fbdev = NULL;
608}
609
610void udl_fbdev_unplug(struct drm_device *dev)
611{
612 struct udl_device *udl = dev->dev_private;
613 struct udl_fbdev *ufbdev;
614 if (!udl->fbdev)
615 return;
616
617 ufbdev = udl->fbdev;
618 drm_fb_helper_unlink_fbi(&ufbdev->helper);
619}
620
621struct drm_framebuffer *
622udl_fb_user_fb_create(struct drm_device *dev,
623 struct drm_file *file,
624 const struct drm_mode_fb_cmd2 *mode_cmd)
625{
626 struct drm_gem_object *obj;
627 struct udl_framebuffer *ufb;
628 int ret;
629 uint32_t size;
630
631 obj = drm_gem_object_lookup(dev, file, mode_cmd->handles[0]);
632 if (obj == NULL)
633 return ERR_PTR(-ENOENT);
634
635 size = mode_cmd->pitches[0] * mode_cmd->height;
636 size = ALIGN(size, PAGE_SIZE);
637
638 if (size > obj->size) {
639 DRM_ERROR("object size not sufficient for fb %d %zu %d %d\n", size, obj->size, mode_cmd->pitches[0], mode_cmd->height);
640 return ERR_PTR(-ENOMEM);
641 }
642
643 ufb = kzalloc(sizeof(*ufb), GFP_KERNEL);
644 if (ufb == NULL)
645 return ERR_PTR(-ENOMEM);
646
647 ret = udl_framebuffer_init(dev, ufb, mode_cmd, to_udl_bo(obj));
648 if (ret) {
649 kfree(ufb);
650 return ERR_PTR(-EINVAL);
651 }
652 return &ufb->base;
653}