9fbb2778716d2070b42b30c8fc393fe2954b8a6c
[linux-2.6.git] / drivers / gpu / drm / udl / udl_fb.c
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
27 static int fb_defio = 1;  /* Optionally enable experimental fb_defio mmap support */
28 static int fb_bpp = 16;
29
30 module_param(fb_bpp, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
31 module_param(fb_defio, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
32
33 struct 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
62 static 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
71 static 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  */
87 static 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
133 error:
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
143 int 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                 udl_gem_vmap(fb->obj);
165
166         aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long));
167         width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long));
168         x = aligned_x;
169
170         if ((width <= 0) ||
171             (x + width > fb->base.width) ||
172             (y + height > fb->base.height))
173                 return -EINVAL;
174
175         /* if we are in atomic just store the info
176            can't test inside spin lock */
177         if (in_atomic())
178                 store_for_later = true;
179
180         x2 = x + width - 1;
181         y2 = y + height - 1;
182
183         spin_lock_irqsave(&fb->dirty_lock, flags);
184
185         if (fb->y1 < y)
186                 y = fb->y1;
187         if (fb->y2 > y2)
188                 y2 = fb->y2;
189         if (fb->x1 < x)
190                 x = fb->x1;
191         if (fb->x2 > x2)
192                 x2 = fb->x2;
193
194         if (store_for_later) {
195                 fb->x1 = x;
196                 fb->x2 = x2;
197                 fb->y1 = y;
198                 fb->y2 = y2;
199                 spin_unlock_irqrestore(&fb->dirty_lock, flags);
200                 return 0;
201         }
202
203         fb->x1 = fb->y1 = INT_MAX;
204         fb->x2 = fb->y2 = 0;
205
206         spin_unlock_irqrestore(&fb->dirty_lock, flags);
207         start_cycles = get_cycles();
208
209         urb = udl_get_urb(dev);
210         if (!urb)
211                 return 0;
212         cmd = urb->transfer_buffer;
213
214         for (i = y; i <= y2 ; i++) {
215                 const int line_offset = fb->base.pitches[0] * i;
216                 const int byte_offset = line_offset + (x * bpp);
217                 const int dev_byte_offset = (fb->base.width * bpp * i) + (x * bpp);
218                 if (udl_render_hline(dev, bpp, &urb,
219                                      (char *) fb->obj->vmapping,
220                                      &cmd, byte_offset, dev_byte_offset,
221                                      (x2 - x + 1) * bpp,
222                                      &bytes_identical, &bytes_sent))
223                         goto error;
224         }
225
226         if (cmd > (char *) urb->transfer_buffer) {
227                 /* Send partial buffer remaining before exiting */
228                 int len = cmd - (char *) urb->transfer_buffer;
229                 ret = udl_submit_urb(dev, urb, len);
230                 bytes_sent += len;
231         } else
232                 udl_urb_completion(urb);
233
234 error:
235         atomic_add(bytes_sent, &udl->bytes_sent);
236         atomic_add(bytes_identical, &udl->bytes_identical);
237         atomic_add(width*height*bpp, &udl->bytes_rendered);
238         end_cycles = get_cycles();
239         atomic_add(((unsigned int) ((end_cycles - start_cycles)
240                     >> 10)), /* Kcycles */
241                    &udl->cpu_kcycles_used);
242
243         return 0;
244 }
245
246 static int udl_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
247 {
248         unsigned long start = vma->vm_start;
249         unsigned long size = vma->vm_end - vma->vm_start;
250         unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
251         unsigned long page, pos;
252
253         if (offset + size > info->fix.smem_len)
254                 return -EINVAL;
255
256         pos = (unsigned long)info->fix.smem_start + offset;
257
258         pr_notice("mmap() framebuffer addr:%lu size:%lu\n",
259                   pos, size);
260
261         while (size > 0) {
262                 page = vmalloc_to_pfn((void *)pos);
263                 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
264                         return -EAGAIN;
265
266                 start += PAGE_SIZE;
267                 pos += PAGE_SIZE;
268                 if (size > PAGE_SIZE)
269                         size -= PAGE_SIZE;
270                 else
271                         size = 0;
272         }
273
274         vma->vm_flags |= VM_RESERVED;   /* avoid to swap out this VMA */
275         return 0;
276 }
277
278 static void udl_fb_fillrect(struct fb_info *info, const struct fb_fillrect *rect)
279 {
280         struct udl_fbdev *ufbdev = info->par;
281
282         sys_fillrect(info, rect);
283
284         udl_handle_damage(&ufbdev->ufb, rect->dx, rect->dy, rect->width,
285                           rect->height);
286 }
287
288 static void udl_fb_copyarea(struct fb_info *info, const struct fb_copyarea *region)
289 {
290         struct udl_fbdev *ufbdev = info->par;
291
292         sys_copyarea(info, region);
293
294         udl_handle_damage(&ufbdev->ufb, region->dx, region->dy, region->width,
295                           region->height);
296 }
297
298 static void udl_fb_imageblit(struct fb_info *info, const struct fb_image *image)
299 {
300         struct udl_fbdev *ufbdev = info->par;
301
302         sys_imageblit(info, image);
303
304         udl_handle_damage(&ufbdev->ufb, image->dx, image->dy, image->width,
305                           image->height);
306 }
307
308 /*
309  * It's common for several clients to have framebuffer open simultaneously.
310  * e.g. both fbcon and X. Makes things interesting.
311  * Assumes caller is holding info->lock (for open and release at least)
312  */
313 static int udl_fb_open(struct fb_info *info, int user)
314 {
315         struct udl_fbdev *ufbdev = info->par;
316         struct drm_device *dev = ufbdev->ufb.base.dev;
317         struct udl_device *udl = dev->dev_private;
318
319         /* If the USB device is gone, we don't accept new opens */
320         if (drm_device_is_unplugged(udl->ddev))
321                 return -ENODEV;
322
323         ufbdev->fb_count++;
324
325         if (fb_defio && (info->fbdefio == NULL)) {
326                 /* enable defio at last moment if not disabled by client */
327
328                 struct fb_deferred_io *fbdefio;
329
330                 fbdefio = kmalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);
331
332                 if (fbdefio) {
333                         fbdefio->delay = DL_DEFIO_WRITE_DELAY;
334                         fbdefio->deferred_io = udlfb_dpy_deferred_io;
335                 }
336
337                 info->fbdefio = fbdefio;
338                 fb_deferred_io_init(info);
339         }
340
341         pr_notice("open /dev/fb%d user=%d fb_info=%p count=%d\n",
342                   info->node, user, info, ufbdev->fb_count);
343
344         return 0;
345 }
346
347
348 /*
349  * Assumes caller is holding info->lock mutex (for open and release at least)
350  */
351 static int udl_fb_release(struct fb_info *info, int user)
352 {
353         struct udl_fbdev *ufbdev = info->par;
354
355         ufbdev->fb_count--;
356
357         if ((ufbdev->fb_count == 0) && (info->fbdefio)) {
358                 fb_deferred_io_cleanup(info);
359                 kfree(info->fbdefio);
360                 info->fbdefio = NULL;
361                 info->fbops->fb_mmap = udl_fb_mmap;
362         }
363
364         pr_warn("released /dev/fb%d user=%d count=%d\n",
365                 info->node, user, ufbdev->fb_count);
366
367         return 0;
368 }
369
370 static struct fb_ops udlfb_ops = {
371         .owner = THIS_MODULE,
372         .fb_check_var = drm_fb_helper_check_var,
373         .fb_set_par = drm_fb_helper_set_par,
374         .fb_fillrect = udl_fb_fillrect,
375         .fb_copyarea = udl_fb_copyarea,
376         .fb_imageblit = udl_fb_imageblit,
377         .fb_pan_display = drm_fb_helper_pan_display,
378         .fb_blank = drm_fb_helper_blank,
379         .fb_setcmap = drm_fb_helper_setcmap,
380         .fb_debug_enter = drm_fb_helper_debug_enter,
381         .fb_debug_leave = drm_fb_helper_debug_leave,
382         .fb_mmap = udl_fb_mmap,
383         .fb_open = udl_fb_open,
384         .fb_release = udl_fb_release,
385 };
386
387 void udl_crtc_fb_gamma_set(struct drm_crtc *crtc, u16 red, u16 green,
388                            u16 blue, int regno)
389 {
390 }
391
392 void udl_crtc_fb_gamma_get(struct drm_crtc *crtc, u16 *red, u16 *green,
393                              u16 *blue, int regno)
394 {
395         *red = 0;
396         *green = 0;
397         *blue = 0;
398 }
399
400 static int udl_user_framebuffer_dirty(struct drm_framebuffer *fb,
401                                       struct drm_file *file,
402                                       unsigned flags, unsigned color,
403                                       struct drm_clip_rect *clips,
404                                       unsigned num_clips)
405 {
406         struct udl_framebuffer *ufb = to_udl_fb(fb);
407         int i;
408
409         if (!ufb->active_16)
410                 return 0;
411
412         for (i = 0; i < num_clips; i++) {
413                 udl_handle_damage(ufb, clips[i].x1, clips[i].y1,
414                                   clips[i].x2 - clips[i].x1,
415                                   clips[i].y2 - clips[i].y1);
416         }
417         return 0;
418 }
419
420 static void udl_user_framebuffer_destroy(struct drm_framebuffer *fb)
421 {
422         struct udl_framebuffer *ufb = to_udl_fb(fb);
423
424         if (ufb->obj)
425                 drm_gem_object_unreference_unlocked(&ufb->obj->base);
426
427         drm_framebuffer_cleanup(fb);
428         kfree(ufb);
429 }
430
431 static const struct drm_framebuffer_funcs udlfb_funcs = {
432         .destroy = udl_user_framebuffer_destroy,
433         .dirty = udl_user_framebuffer_dirty,
434         .create_handle = NULL,
435 };
436
437
438 static int
439 udl_framebuffer_init(struct drm_device *dev,
440                      struct udl_framebuffer *ufb,
441                      struct drm_mode_fb_cmd2 *mode_cmd,
442                      struct udl_gem_object *obj)
443 {
444         int ret;
445
446         spin_lock_init(&ufb->dirty_lock);
447         ufb->obj = obj;
448         ret = drm_framebuffer_init(dev, &ufb->base, &udlfb_funcs);
449         drm_helper_mode_fill_fb_struct(&ufb->base, mode_cmd);
450         return ret;
451 }
452
453
454 static int udlfb_create(struct udl_fbdev *ufbdev,
455                         struct drm_fb_helper_surface_size *sizes)
456 {
457         struct drm_device *dev = ufbdev->helper.dev;
458         struct fb_info *info;
459         struct device *device = &dev->usbdev->dev;
460         struct drm_framebuffer *fb;
461         struct drm_mode_fb_cmd2 mode_cmd;
462         struct udl_gem_object *obj;
463         uint32_t size;
464         int ret = 0;
465
466         if (sizes->surface_bpp == 24)
467                 sizes->surface_bpp = 32;
468
469         mode_cmd.width = sizes->surface_width;
470         mode_cmd.height = sizes->surface_height;
471         mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
472
473         mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
474                                                           sizes->surface_depth);
475
476         size = mode_cmd.pitches[0] * mode_cmd.height;
477         size = ALIGN(size, PAGE_SIZE);
478
479         obj = udl_gem_alloc_object(dev, size);
480         if (!obj)
481                 goto out;
482
483         ret = udl_gem_vmap(obj);
484         if (ret) {
485                 DRM_ERROR("failed to vmap fb\n");
486                 goto out_gfree;
487         }
488
489         info = framebuffer_alloc(0, device);
490         if (!info) {
491                 ret = -ENOMEM;
492                 goto out_gfree;
493         }
494         info->par = ufbdev;
495
496         ret = udl_framebuffer_init(dev, &ufbdev->ufb, &mode_cmd, obj);
497         if (ret)
498                 goto out_gfree;
499
500         fb = &ufbdev->ufb.base;
501
502         ufbdev->helper.fb = fb;
503         ufbdev->helper.fbdev = info;
504
505         strcpy(info->fix.id, "udldrmfb");
506
507         info->screen_base = ufbdev->ufb.obj->vmapping;
508         info->fix.smem_len = size;
509         info->fix.smem_start = (unsigned long)ufbdev->ufb.obj->vmapping;
510
511         info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
512         info->fbops = &udlfb_ops;
513         drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
514         drm_fb_helper_fill_var(info, &ufbdev->helper, sizes->fb_width, sizes->fb_height);
515
516         ret = fb_alloc_cmap(&info->cmap, 256, 0);
517         if (ret) {
518                 ret = -ENOMEM;
519                 goto out_gfree;
520         }
521
522
523         DRM_DEBUG_KMS("allocated %dx%d vmal %p\n",
524                       fb->width, fb->height,
525                       ufbdev->ufb.obj->vmapping);
526
527         return ret;
528 out_gfree:
529         drm_gem_object_unreference(&ufbdev->ufb.obj->base);
530 out:
531         return ret;
532 }
533
534 static int udl_fb_find_or_create_single(struct drm_fb_helper *helper,
535                                         struct drm_fb_helper_surface_size *sizes)
536 {
537         struct udl_fbdev *ufbdev = (struct udl_fbdev *)helper;
538         int new_fb = 0;
539         int ret;
540
541         if (!helper->fb) {
542                 ret = udlfb_create(ufbdev, sizes);
543                 if (ret)
544                         return ret;
545
546                 new_fb = 1;
547         }
548         return new_fb;
549 }
550
551 static struct drm_fb_helper_funcs udl_fb_helper_funcs = {
552         .gamma_set = udl_crtc_fb_gamma_set,
553         .gamma_get = udl_crtc_fb_gamma_get,
554         .fb_probe = udl_fb_find_or_create_single,
555 };
556
557 static 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_cleanup(&ufbdev->ufb.base);
570         drm_gem_object_unreference_unlocked(&ufbdev->ufb.obj->base);
571 }
572
573 int udl_fbdev_init(struct drm_device *dev)
574 {
575         struct udl_device *udl = dev->dev_private;
576         int bpp_sel = fb_bpp;
577         struct udl_fbdev *ufbdev;
578         int ret;
579
580         ufbdev = kzalloc(sizeof(struct udl_fbdev), GFP_KERNEL);
581         if (!ufbdev)
582                 return -ENOMEM;
583
584         udl->fbdev = ufbdev;
585         ufbdev->helper.funcs = &udl_fb_helper_funcs;
586
587         ret = drm_fb_helper_init(dev, &ufbdev->helper,
588                                  1, 1);
589         if (ret) {
590                 kfree(ufbdev);
591                 return ret;
592
593         }
594
595         drm_fb_helper_single_add_all_connectors(&ufbdev->helper);
596         drm_fb_helper_initial_config(&ufbdev->helper, bpp_sel);
597         return 0;
598 }
599
600 void udl_fbdev_cleanup(struct drm_device *dev)
601 {
602         struct udl_device *udl = dev->dev_private;
603         if (!udl->fbdev)
604                 return;
605
606         udl_fbdev_destroy(dev, udl->fbdev);
607         kfree(udl->fbdev);
608         udl->fbdev = NULL;
609 }
610
611 void udl_fbdev_unplug(struct drm_device *dev)
612 {
613         struct udl_device *udl = dev->dev_private;
614         struct udl_fbdev *ufbdev;
615         if (!udl->fbdev)
616                 return;
617
618         ufbdev = udl->fbdev;
619         if (ufbdev->helper.fbdev) {
620                 struct fb_info *info;
621                 info = ufbdev->helper.fbdev;
622                 unlink_framebuffer(info);
623         }
624 }
625
626 struct drm_framebuffer *
627 udl_fb_user_fb_create(struct drm_device *dev,
628                    struct drm_file *file,
629                    struct drm_mode_fb_cmd2 *mode_cmd)
630 {
631         struct drm_gem_object *obj;
632         struct udl_framebuffer *ufb;
633         int ret;
634
635         obj = drm_gem_object_lookup(dev, file, mode_cmd->handles[0]);
636         if (obj == NULL)
637                 return ERR_PTR(-ENOENT);
638
639         ufb = kzalloc(sizeof(*ufb), GFP_KERNEL);
640         if (ufb == NULL)
641                 return ERR_PTR(-ENOMEM);
642
643         ret = udl_framebuffer_init(dev, ufb, mode_cmd, to_udl_bo(obj));
644         if (ret) {
645                 kfree(ufb);
646                 return ERR_PTR(-EINVAL);
647         }
648         return &ufb->base;
649 }