summaryrefslogtreecommitdiff
path: root/drivers/gpu/drm/udl/udl_fb.c
blob: ce9a61179925cd540f4d4956b991513ca53b27e2 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
506
507
508
509
510
511
512
513
514
515
516
517
518
519
520
521
522
523
524
525
526
527
528
529
530
531
532
533
534
535
536
537
538
539
540
541
542
543
544
545
546
547
548
549
550
551
552
553
554
555
556
557
558
559
560
561
562
563
564
565
566
567
568
569
570
571
572
573
574
575
576
577
578
579
580
581
582
583
584
585
586
587
588
589
590
591
592
593
594
595
596
597
598
599
600
601
602
603
604
605
606
607
608
609
610
611
612
613
614
615
616
617
618
619
620
621
622
623
624
625
626
627
628
629
/*
 * Copyright (C) 2012 Red Hat
 *
 * based in parts on udlfb.c:
 * Copyright (C) 2009 Roberto De Ioris <roberto@unbit.it>
 * Copyright (C) 2009 Jaya Kumar <jayakumar.lkml@gmail.com>
 * Copyright (C) 2009 Bernie Thompson <bernie@plugable.com>
 *
 * This file is subject to the terms and conditions of the GNU General Public
 * License v2. See the file COPYING in the main directory of this archive for
 * more details.
 */
#include <linux/module.h>
#include <linux/slab.h>
#include <linux/fb.h>

#include "drmP.h"
#include "drm.h"
#include "drm_crtc.h"
#include "drm_crtc_helper.h"
#include "udl_drv.h"

#include "drm_fb_helper.h"

#define DL_DEFIO_WRITE_DELAY    5 /* fb_deferred_io.delay in jiffies */

static int fb_defio = 1;  /* Optionally enable experimental fb_defio mmap support */
static int fb_bpp = 16;

module_param(fb_bpp, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
module_param(fb_defio, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);

struct udl_fbdev {
	struct drm_fb_helper helper;
	struct udl_framebuffer ufb;
	struct list_head fbdev_list;
	int fb_count;
};

#define DL_ALIGN_UP(x, a) ALIGN(x, a)
#define DL_ALIGN_DOWN(x, a) ALIGN(x-(a-1), a)

/** Read the red component (0..255) of a 32 bpp colour. */
#define DLO_RGB_GETRED(col) (uint8_t)((col) & 0xFF)

/** Read the green component (0..255) of a 32 bpp colour. */
#define DLO_RGB_GETGRN(col) (uint8_t)(((col) >> 8) & 0xFF)

/** Read the blue component (0..255) of a 32 bpp colour. */
#define DLO_RGB_GETBLU(col) (uint8_t)(((col) >> 16) & 0xFF)

/** Return red/green component of a 16 bpp colour number. */
#define DLO_RG16(red, grn) (uint8_t)((((red) & 0xF8) | ((grn) >> 5)) & 0xFF)

/** Return green/blue component of a 16 bpp colour number. */
#define DLO_GB16(grn, blu) (uint8_t)(((((grn) & 0x1C) << 3) | ((blu) >> 3)) & 0xFF)

/** Return 8 bpp colour number from red, green and blue components. */
#define DLO_RGB8(red, grn, blu) ((((red) << 5) | (((grn) & 3) << 3) | ((blu) & 7)) & 0xFF)

#if 0
static uint8_t rgb8(uint32_t col)
{
	uint8_t red = DLO_RGB_GETRED(col);
	uint8_t grn = DLO_RGB_GETGRN(col);
	uint8_t blu = DLO_RGB_GETBLU(col);

	return DLO_RGB8(red, grn, blu);
}

static uint16_t rgb16(uint32_t col)
{
	uint8_t red = DLO_RGB_GETRED(col);
	uint8_t grn = DLO_RGB_GETGRN(col);
	uint8_t blu = DLO_RGB_GETBLU(col);

	return (DLO_RG16(red, grn) << 8) + DLO_GB16(grn, blu);
}
#endif

/*
 * NOTE: fb_defio.c is holding info->fbdefio.mutex
 *   Touching ANY framebuffer memory that triggers a page fault
 *   in fb_defio will cause a deadlock, when it also tries to
 *   grab the same mutex.
 */
static void udlfb_dpy_deferred_io(struct fb_info *info,
				  struct list_head *pagelist)
{
	struct page *cur;
	struct fb_deferred_io *fbdefio = info->fbdefio;
	struct udl_fbdev *ufbdev = info->par;
	struct drm_device *dev = ufbdev->ufb.base.dev;
	struct udl_device *udl = dev->dev_private;
	struct urb *urb;
	char *cmd;
	cycles_t start_cycles, end_cycles;
	int bytes_sent = 0;
	int bytes_identical = 0;
	int bytes_rendered = 0;

	if (!fb_defio)
		return;

	start_cycles = get_cycles();

	urb = udl_get_urb(dev);
	if (!urb)
		return;

	cmd = urb->transfer_buffer;

	/* walk the written page list and render each to device */
	list_for_each_entry(cur, &fbdefio->pagelist, lru) {

		if (udl_render_hline(dev, (ufbdev->ufb.base.bits_per_pixel / 8),
				  &urb, (char *) info->fix.smem_start,
				  &cmd, cur->index << PAGE_SHIFT,
				  PAGE_SIZE, &bytes_identical, &bytes_sent))
			goto error;
		bytes_rendered += PAGE_SIZE;
	}

	if (cmd > (char *) urb->transfer_buffer) {
		/* Send partial buffer remaining before exiting */
		int len = cmd - (char *) urb->transfer_buffer;
		udl_submit_urb(dev, urb, len);
		bytes_sent += len;
	} else
		udl_urb_completion(urb);

error:
	atomic_add(bytes_sent, &udl->bytes_sent);
	atomic_add(bytes_identical, &udl->bytes_identical);
	atomic_add(bytes_rendered, &udl->bytes_rendered);
	end_cycles = get_cycles();
	atomic_add(((unsigned int) ((end_cycles - start_cycles)
		    >> 10)), /* Kcycles */
		   &udl->cpu_kcycles_used);
}

int udl_handle_damage(struct udl_framebuffer *fb, int x, int y,
		      int width, int height)
{
	struct drm_device *dev = fb->base.dev;
	struct udl_device *udl = dev->dev_private;
	int i, ret;
	char *cmd;
	cycles_t start_cycles, end_cycles;
	int bytes_sent = 0;
	int bytes_identical = 0;
	struct urb *urb;
	int aligned_x;
	int bpp = (fb->base.bits_per_pixel / 8);

	if (!fb->active_16)
		return 0;

	if (!fb->obj->vmapping) {
		ret = udl_gem_vmap(fb->obj);
		if (ret == -ENOMEM) {
			DRM_ERROR("failed to vmap fb\n");
			return 0;
		}
		if (!fb->obj->vmapping) {
			DRM_ERROR("failed to vmapping\n");
			return 0;
		}
	}

	start_cycles = get_cycles();

	aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long));
	width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long));
	x = aligned_x;

	if ((width <= 0) ||
	    (x + width > fb->base.width) ||
	    (y + height > fb->base.height))
		return -EINVAL;

	urb = udl_get_urb(dev);
	if (!urb)
		return 0;
	cmd = urb->transfer_buffer;

	for (i = y; i < y + height ; i++) {
		const int line_offset = fb->base.pitches[0] * i;
		const int byte_offset = line_offset + (x * bpp);

		if (udl_render_hline(dev, bpp, &urb,
				     (char *) fb->obj->vmapping,
				     &cmd, byte_offset, width * bpp,
				     &bytes_identical, &bytes_sent))
			goto error;
	}

	if (cmd > (char *) urb->transfer_buffer) {
		/* Send partial buffer remaining before exiting */
		int len = cmd - (char *) urb->transfer_buffer;
		ret = udl_submit_urb(dev, urb, len);
		bytes_sent += len;
	} else
		udl_urb_completion(urb);

error:
	atomic_add(bytes_sent, &udl->bytes_sent);
	atomic_add(bytes_identical, &udl->bytes_identical);
	atomic_add(width*height*bpp, &udl->bytes_rendered);
	end_cycles = get_cycles();
	atomic_add(((unsigned int) ((end_cycles - start_cycles)
		    >> 10)), /* Kcycles */
		   &udl->cpu_kcycles_used);

	return 0;
}

static int udl_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
	unsigned long start = vma->vm_start;
	unsigned long size = vma->vm_end - vma->vm_start;
	unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
	unsigned long page, pos;

	if (offset + size > info->fix.smem_len)
		return -EINVAL;

	pos = (unsigned long)info->fix.smem_start + offset;

	pr_notice("mmap() framebuffer addr:%lu size:%lu\n",
		  pos, size);

	while (size > 0) {
		page = vmalloc_to_pfn((void *)pos);
		if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
			return -EAGAIN;

		start += PAGE_SIZE;
		pos += PAGE_SIZE;
		if (size > PAGE_SIZE)
			size -= PAGE_SIZE;
		else
			size = 0;
	}

	vma->vm_flags |= VM_RESERVED;	/* avoid to swap out this VMA */
	return 0;
}

static void udl_fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
{
	struct udl_fbdev *ufbdev = info->par;

	sys_fillrect(info, rect);

	udl_handle_damage(&ufbdev->ufb, rect->dx, rect->dy, rect->width,
			  rect->height);
}

static void udl_fb_copyarea(struct fb_info *info, const struct fb_copyarea *region)
{
	struct udl_fbdev *ufbdev = info->par;

	sys_copyarea(info, region);

	udl_handle_damage(&ufbdev->ufb, region->dx, region->dy, region->width,
			  region->height);
}

static void udl_fb_imageblit(struct fb_info *info, const struct fb_image *image)
{
	struct udl_fbdev *ufbdev = info->par;

	sys_imageblit(info, image);

	udl_handle_damage(&ufbdev->ufb, image->dx, image->dy, image->width,
			  image->height);
}

/*
 * It's common for several clients to have framebuffer open simultaneously.
 * e.g. both fbcon and X. Makes things interesting.
 * Assumes caller is holding info->lock (for open and release at least)
 */
static int udl_fb_open(struct fb_info *info, int user)
{
	struct udl_fbdev *ufbdev = info->par;
	struct drm_device *dev = ufbdev->ufb.base.dev;
	struct udl_device *udl = dev->dev_private;

	/* If the USB device is gone, we don't accept new opens */
	if (drm_device_is_unplugged(udl->ddev))
		return -ENODEV;

	ufbdev->fb_count++;

	if (fb_defio && (info->fbdefio == NULL)) {
		/* enable defio at last moment if not disabled by client */

		struct fb_deferred_io *fbdefio;

		fbdefio = kmalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);

		if (fbdefio) {
			fbdefio->delay = DL_DEFIO_WRITE_DELAY;
			fbdefio->deferred_io = udlfb_dpy_deferred_io;
		}

		info->fbdefio = fbdefio;
		fb_deferred_io_init(info);
	}

	pr_notice("open /dev/fb%d user=%d fb_info=%p count=%d\n",
		  info->node, user, info, ufbdev->fb_count);

	return 0;
}


/*
 * Assumes caller is holding info->lock mutex (for open and release at least)
 */
static int udl_fb_release(struct fb_info *info, int user)
{
	struct udl_fbdev *ufbdev = info->par;

	ufbdev->fb_count--;

	if ((ufbdev->fb_count == 0) && (info->fbdefio)) {
		fb_deferred_io_cleanup(info);
		kfree(info->fbdefio);
		info->fbdefio = NULL;
		info->fbops->fb_mmap = udl_fb_mmap;
	}

	pr_warn("released /dev/fb%d user=%d count=%d\n",
		info->node, user, ufbdev->fb_count);

	return 0;
}

static struct fb_ops udlfb_ops = {
	.owner = THIS_MODULE,
	.fb_check_var = drm_fb_helper_check_var,
	.fb_set_par = drm_fb_helper_set_par,
	.fb_fillrect = udl_fb_fillrect,
	.fb_copyarea = udl_fb_copyarea,
	.fb_imageblit = udl_fb_imageblit,
	.fb_pan_display = drm_fb_helper_pan_display,
	.fb_blank = drm_fb_helper_blank,
	.fb_setcmap = drm_fb_helper_setcmap,
	.fb_debug_enter = drm_fb_helper_debug_enter,
	.fb_debug_leave = drm_fb_helper_debug_leave,
	.fb_mmap = udl_fb_mmap,
	.fb_open = udl_fb_open,
	.fb_release = udl_fb_release,
};

void udl_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
			   u16 blue, int regno)
{
}

void udl_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
			     u16 *blue, int regno)
{
	*red = 0;
	*green = 0;
	*blue = 0;
}

static int udl_user_framebuffer_dirty(struct drm_framebuffer *fb,
				      struct drm_file *file,
				      unsigned flags, unsigned color,
				      struct drm_clip_rect *clips,
				      unsigned num_clips)
{
	struct udl_framebuffer *ufb = to_udl_fb(fb);
	int i;

	if (!ufb->active_16)
		return 0;

	for (i = 0; i < num_clips; i++) {
		udl_handle_damage(ufb, clips[i].x1, clips[i].y1,
				  clips[i].x2 - clips[i].x1,
				  clips[i].y2 - clips[i].y1);
	}
	return 0;
}

static void udl_user_framebuffer_destroy(struct drm_framebuffer *fb)
{
	struct udl_framebuffer *ufb = to_udl_fb(fb);

	if (ufb->obj)
		drm_gem_object_unreference_unlocked(&ufb->obj->base);

	drm_framebuffer_cleanup(fb);
	kfree(ufb);
}

static const struct drm_framebuffer_funcs udlfb_funcs = {
	.destroy = udl_user_framebuffer_destroy,
	.dirty = udl_user_framebuffer_dirty,
	.create_handle = NULL,
};


static int
udl_framebuffer_init(struct drm_device *dev,
		     struct udl_framebuffer *ufb,
		     struct drm_mode_fb_cmd2 *mode_cmd,
		     struct udl_gem_object *obj)
{
	int ret;

	ufb->obj = obj;
	ret = drm_framebuffer_init(dev, &ufb->base, &udlfb_funcs);
	drm_helper_mode_fill_fb_struct(&ufb->base, mode_cmd);
	return ret;
}


static int udlfb_create(struct udl_fbdev *ufbdev,
			struct drm_fb_helper_surface_size *sizes)
{
	struct drm_device *dev = ufbdev->helper.dev;
	struct fb_info *info;
	struct device *device = &dev->usbdev->dev;
	struct drm_framebuffer *fb;
	struct drm_mode_fb_cmd2 mode_cmd;
	struct udl_gem_object *obj;
	uint32_t size;
	int ret = 0;

	if (sizes->surface_bpp == 24)
		sizes->surface_bpp = 32;

	mode_cmd.width = sizes->surface_width;
	mode_cmd.height = sizes->surface_height;
	mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);

	mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
							  sizes->surface_depth);

	size = mode_cmd.pitches[0] * mode_cmd.height;
	size = ALIGN(size, PAGE_SIZE);

	obj = udl_gem_alloc_object(dev, size);
	if (!obj)
		goto out;

	ret = udl_gem_vmap(obj);
	if (ret) {
		DRM_ERROR("failed to vmap fb\n");
		goto out_gfree;
	}

	info = framebuffer_alloc(0, device);
	if (!info) {
		ret = -ENOMEM;
		goto out_gfree;
	}
	info->par = ufbdev;

	ret = udl_framebuffer_init(dev, &ufbdev->ufb, &mode_cmd, obj);
	if (ret)
		goto out_gfree;

	fb = &ufbdev->ufb.base;

	ufbdev->helper.fb = fb;
	ufbdev->helper.fbdev = info;

	strcpy(info->fix.id, "udldrmfb");

	info->screen_base = ufbdev->ufb.obj->vmapping;
	info->fix.smem_len = size;
	info->fix.smem_start = (unsigned long)ufbdev->ufb.obj->vmapping;

	info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
	info->fbops = &udlfb_ops;
	drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
	drm_fb_helper_fill_var(info, &ufbdev->helper, sizes->fb_width, sizes->fb_height);

	ret = fb_alloc_cmap(&info->cmap, 256, 0);
	if (ret) {
		ret = -ENOMEM;
		goto out_gfree;
	}


	DRM_DEBUG_KMS("allocated %dx%d vmal %p\n",
		      fb->width, fb->height,
		      ufbdev->ufb.obj->vmapping);

	return ret;
out_gfree:
	drm_gem_object_unreference(&ufbdev->ufb.obj->base);
out:
	return ret;
}

static int udl_fb_find_or_create_single(struct drm_fb_helper *helper,
					struct drm_fb_helper_surface_size *sizes)
{
	struct udl_fbdev *ufbdev = (struct udl_fbdev *)helper;
	int new_fb = 0;
	int ret;

	if (!helper->fb) {
		ret = udlfb_create(ufbdev, sizes);
		if (ret)
			return ret;

		new_fb = 1;
	}
	return new_fb;
}

static struct drm_fb_helper_funcs udl_fb_helper_funcs = {
	.gamma_set = udl_crtc_fb_gamma_set,
	.gamma_get = udl_crtc_fb_gamma_get,
	.fb_probe = udl_fb_find_or_create_single,
};

static void udl_fbdev_destroy(struct drm_device *dev,
			      struct udl_fbdev *ufbdev)
{
	struct fb_info *info;
	if (ufbdev->helper.fbdev) {
		info = ufbdev->helper.fbdev;
		unregister_framebuffer(info);
		if (info->cmap.len)
			fb_dealloc_cmap(&info->cmap);
		framebuffer_release(info);
	}
	drm_fb_helper_fini(&ufbdev->helper);
	drm_framebuffer_cleanup(&ufbdev->ufb.base);
	drm_gem_object_unreference_unlocked(&ufbdev->ufb.obj->base);
}

int udl_fbdev_init(struct drm_device *dev)
{
	struct udl_device *udl = dev->dev_private;
	int bpp_sel = fb_bpp;
	struct udl_fbdev *ufbdev;
	int ret;

	ufbdev = kzalloc(sizeof(struct udl_fbdev), GFP_KERNEL);
	if (!ufbdev)
		return -ENOMEM;

	udl->fbdev = ufbdev;
	ufbdev->helper.funcs = &udl_fb_helper_funcs;

	ret = drm_fb_helper_init(dev, &ufbdev->helper,
				 1, 1);
	if (ret) {
		kfree(ufbdev);
		return ret;

	}

	drm_fb_helper_single_add_all_connectors(&ufbdev->helper);
	drm_fb_helper_initial_config(&ufbdev->helper, bpp_sel);
	return 0;
}

void udl_fbdev_cleanup(struct drm_device *dev)
{
	struct udl_device *udl = dev->dev_private;
	if (!udl->fbdev)
		return;

	udl_fbdev_destroy(dev, udl->fbdev);
	kfree(udl->fbdev);
	udl->fbdev = NULL;
}

void udl_fbdev_unplug(struct drm_device *dev)
{
	struct udl_device *udl = dev->dev_private;
	struct udl_fbdev *ufbdev;
	if (!udl->fbdev)
		return;

	ufbdev = udl->fbdev;
	if (ufbdev->helper.fbdev) {
		struct fb_info *info;
		info = ufbdev->helper.fbdev;
		unlink_framebuffer(info);
	}
}

struct drm_framebuffer *
udl_fb_user_fb_create(struct drm_device *dev,
		   struct drm_file *file,
		   struct drm_mode_fb_cmd2 *mode_cmd)
{
	struct drm_gem_object *obj;
	struct udl_framebuffer *ufb;
	int ret;
	uint32_t size;

	obj = drm_gem_object_lookup(dev, file, mode_cmd->handles[0]);
	if (obj == NULL)
		return ERR_PTR(-ENOENT);

	size = mode_cmd->pitches[0] * mode_cmd->height;
	size = ALIGN(size, PAGE_SIZE);

	if (size > obj->size) {
		DRM_ERROR("object size not sufficient for fb %d %zu %d %d\n", size, obj->size, mode_cmd->pitches[0], mode_cmd->height);
		return ERR_PTR(-ENOMEM);
	}

	ufb = kzalloc(sizeof(*ufb), GFP_KERNEL);
	if (ufb == NULL)
		return ERR_PTR(-ENOMEM);

	ret = udl_framebuffer_init(dev, ufb, mode_cmd, to_udl_bo(obj));
	if (ret) {
		kfree(ufb);
		return ERR_PTR(-EINVAL);
	}
	return &ufb->base;
}