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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
80int udl_handle_damage(struct udl_framebuffer *fb, int x, int y,
81 int width, int height)
82{
83 struct drm_device *dev = fb->base.dev;
84 struct udl_device *udl = dev->dev_private;
85 int i, ret;
86 char *cmd;
87 cycles_t start_cycles, end_cycles;
88 int bytes_sent = 0;
89 int bytes_identical = 0;
90 struct urb *urb;
91 int aligned_x;
92 int bpp = (fb->base.bits_per_pixel / 8);
93
94 if (!fb->active_16)
95 return 0;
96
97 if (!fb->obj->vmapping) {
98 ret = udl_gem_vmap(fb->obj);
99 if (ret == -ENOMEM) {
100 DRM_ERROR("failed to vmap fb\n");
101 return 0;
102 }
103 if (!fb->obj->vmapping) {
104 DRM_ERROR("failed to vmapping\n");
105 return 0;
106 }
107 }
108
109 aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long));
110 width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long));
111 x = aligned_x;
112
113 if ((width <= 0) ||
114 (x + width > fb->base.width) ||
115 (y + height > fb->base.height))
116 return -EINVAL;
117
118 start_cycles = get_cycles();
119
120 urb = udl_get_urb(dev);
121 if (!urb)
122 return 0;
123 cmd = urb->transfer_buffer;
124
125 for (i = y; i < y + height ; i++) {
126 const int line_offset = fb->base.pitches[0] * i;
127 const int byte_offset = line_offset + (x * bpp);
128 const int dev_byte_offset = (fb->base.width * bpp * i) + (x * bpp);
129 if (udl_render_hline(dev, bpp, &urb,
130 (char *) fb->obj->vmapping,
131 &cmd, byte_offset, dev_byte_offset,
132 width * bpp,
133 &bytes_identical, &bytes_sent))
134 goto error;
135 }
136
137 if (cmd > (char *) urb->transfer_buffer) {
138 /* Send partial buffer remaining before exiting */
139 int len = cmd - (char *) urb->transfer_buffer;
140 ret = udl_submit_urb(dev, urb, len);
141 bytes_sent += len;
142 } else
143 udl_urb_completion(urb);
144
145error:
146 atomic_add(bytes_sent, &udl->bytes_sent);
147 atomic_add(bytes_identical, &udl->bytes_identical);
148 atomic_add(width*height*bpp, &udl->bytes_rendered);
149 end_cycles = get_cycles();
150 atomic_add(((unsigned int) ((end_cycles - start_cycles)
151 >> 10)), /* Kcycles */
152 &udl->cpu_kcycles_used);
153
154 return 0;
155}
156
157static int udl_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
158{
159 unsigned long start = vma->vm_start;
160 unsigned long size = vma->vm_end - vma->vm_start;
161 unsigned long offset = vma->vm_pgoff << PAGE_SHIFT;
162 unsigned long page, pos;
163
164 if (offset + size > info->fix.smem_len)
165 return -EINVAL;
166
167 pos = (unsigned long)info->fix.smem_start + offset;
168
169 pr_notice("mmap() framebuffer addr:%lu size:%lu\n",
170 pos, size);
171
172 while (size > 0) {
173 page = vmalloc_to_pfn((void *)pos);
174 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
175 return -EAGAIN;
176
177 start += PAGE_SIZE;
178 pos += PAGE_SIZE;
179 if (size > PAGE_SIZE)
180 size -= PAGE_SIZE;
181 else
182 size = 0;
183 }
184
185 /* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */
186 return 0;
187}
188
189/*
190 * It's common for several clients to have framebuffer open simultaneously.
191 * e.g. both fbcon and X. Makes things interesting.
192 * Assumes caller is holding info->lock (for open and release at least)
193 */
194static int udl_fb_open(struct fb_info *info, int user)
195{
196 struct udl_fbdev *ufbdev = info->par;
197 struct drm_device *dev = ufbdev->ufb.base.dev;
198 struct udl_device *udl = dev->dev_private;
199
200 /* If the USB device is gone, we don't accept new opens */
201 if (drm_device_is_unplugged(udl->ddev))
202 return -ENODEV;
203
204 ufbdev->fb_count++;
205
206#ifdef CONFIG_DRM_FBDEV_EMULATION
207 if (fb_defio && (info->fbdefio == NULL)) {
208 /* enable defio at last moment if not disabled by client */
209
210 struct fb_deferred_io *fbdefio;
211
212 fbdefio = kmalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);
213
214 if (fbdefio) {
215 fbdefio->delay = DL_DEFIO_WRITE_DELAY;
216 fbdefio->deferred_io = drm_fb_helper_deferred_io;
217 }
218
219 info->fbdefio = fbdefio;
220 fb_deferred_io_init(info);
221 }
222#endif
223
224 pr_notice("open /dev/fb%d user=%d fb_info=%p count=%d\n",
225 info->node, user, info, ufbdev->fb_count);
226
227 return 0;
228}
229
230
231/*
232 * Assumes caller is holding info->lock mutex (for open and release at least)
233 */
234static int udl_fb_release(struct fb_info *info, int user)
235{
236 struct udl_fbdev *ufbdev = info->par;
237
238 ufbdev->fb_count--;
239
240#ifdef CONFIG_DRM_FBDEV_EMULATION
241 if ((ufbdev->fb_count == 0) && (info->fbdefio)) {
242 fb_deferred_io_cleanup(info);
243 kfree(info->fbdefio);
244 info->fbdefio = NULL;
245 info->fbops->fb_mmap = udl_fb_mmap;
246 }
247#endif
248
249 pr_warn("released /dev/fb%d user=%d count=%d\n",
250 info->node, user, ufbdev->fb_count);
251
252 return 0;
253}
254
255static struct fb_ops udlfb_ops = {
256 .owner = THIS_MODULE,
257 DRM_FB_HELPER_DEFAULT_OPS,
258 .fb_fillrect = drm_fb_helper_sys_fillrect,
259 .fb_copyarea = drm_fb_helper_sys_copyarea,
260 .fb_imageblit = drm_fb_helper_sys_imageblit,
261 .fb_mmap = udl_fb_mmap,
262 .fb_open = udl_fb_open,
263 .fb_release = udl_fb_release,
264};
265
266static int udl_user_framebuffer_dirty(struct drm_framebuffer *fb,
267 struct drm_file *file,
268 unsigned flags, unsigned color,
269 struct drm_clip_rect *clips,
270 unsigned num_clips)
271{
272 struct udl_framebuffer *ufb = to_udl_fb(fb);
273 int i;
274 int ret = 0;
275
276 drm_modeset_lock_all(fb->dev);
277
278 if (!ufb->active_16)
279 goto unlock;
280
281 if (ufb->obj->base.import_attach) {
282 ret = dma_buf_begin_cpu_access(ufb->obj->base.import_attach->dmabuf,
283 DMA_FROM_DEVICE);
284 if (ret)
285 goto unlock;
286 }
287
288 for (i = 0; i < num_clips; i++) {
289 ret = udl_handle_damage(ufb, clips[i].x1, clips[i].y1,
290 clips[i].x2 - clips[i].x1,
291 clips[i].y2 - clips[i].y1);
292 if (ret)
293 break;
294 }
295
296 if (ufb->obj->base.import_attach) {
297 ret = dma_buf_end_cpu_access(ufb->obj->base.import_attach->dmabuf,
298 DMA_FROM_DEVICE);
299 }
300
301 unlock:
302 drm_modeset_unlock_all(fb->dev);
303
304 return ret;
305}
306
307static void udl_user_framebuffer_destroy(struct drm_framebuffer *fb)
308{
309 struct udl_framebuffer *ufb = to_udl_fb(fb);
310
311 if (ufb->obj)
312 drm_gem_object_unreference_unlocked(&ufb->obj->base);
313
314 drm_framebuffer_cleanup(fb);
315 kfree(ufb);
316}
317
318static const struct drm_framebuffer_funcs udlfb_funcs = {
319 .destroy = udl_user_framebuffer_destroy,
320 .dirty = udl_user_framebuffer_dirty,
321};
322
323
324static int
325udl_framebuffer_init(struct drm_device *dev,
326 struct udl_framebuffer *ufb,
327 const struct drm_mode_fb_cmd2 *mode_cmd,
328 struct udl_gem_object *obj)
329{
330 int ret;
331
332 ufb->obj = obj;
333 drm_helper_mode_fill_fb_struct(&ufb->base, mode_cmd);
334 ret = drm_framebuffer_init(dev, &ufb->base, &udlfb_funcs);
335 return ret;
336}
337
338
339static int udlfb_create(struct drm_fb_helper *helper,
340 struct drm_fb_helper_surface_size *sizes)
341{
342 struct udl_fbdev *ufbdev =
343 container_of(helper, struct udl_fbdev, helper);
344 struct drm_device *dev = ufbdev->helper.dev;
345 struct fb_info *info;
346 struct drm_framebuffer *fb;
347 struct drm_mode_fb_cmd2 mode_cmd;
348 struct udl_gem_object *obj;
349 uint32_t size;
350 int ret = 0;
351
352 if (sizes->surface_bpp == 24)
353 sizes->surface_bpp = 32;
354
355 mode_cmd.width = sizes->surface_width;
356 mode_cmd.height = sizes->surface_height;
357 mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
358
359 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
360 sizes->surface_depth);
361
362 size = mode_cmd.pitches[0] * mode_cmd.height;
363 size = ALIGN(size, PAGE_SIZE);
364
365 obj = udl_gem_alloc_object(dev, size);
366 if (!obj)
367 goto out;
368
369 ret = udl_gem_vmap(obj);
370 if (ret) {
371 DRM_ERROR("failed to vmap fb\n");
372 goto out_gfree;
373 }
374
375 info = drm_fb_helper_alloc_fbi(helper);
376 if (IS_ERR(info)) {
377 ret = PTR_ERR(info);
378 goto out_gfree;
379 }
380 info->par = ufbdev;
381
382 ret = udl_framebuffer_init(dev, &ufbdev->ufb, &mode_cmd, obj);
383 if (ret)
384 goto out_destroy_fbi;
385
386 fb = &ufbdev->ufb.base;
387
388 ufbdev->helper.fb = fb;
389
390 strcpy(info->fix.id, "udldrmfb");
391
392 info->screen_base = ufbdev->ufb.obj->vmapping;
393 info->fix.smem_len = size;
394 info->fix.smem_start = (unsigned long)ufbdev->ufb.obj->vmapping;
395
396 info->flags = FBINFO_DEFAULT | FBINFO_CAN_FORCE_OUTPUT;
397 info->fbops = &udlfb_ops;
398 drm_fb_helper_fill_fix(info, fb->pitches[0], fb->depth);
399 drm_fb_helper_fill_var(info, &ufbdev->helper, sizes->fb_width, sizes->fb_height);
400
401 DRM_DEBUG_KMS("allocated %dx%d vmal %p\n",
402 fb->width, fb->height,
403 ufbdev->ufb.obj->vmapping);
404
405 return ret;
406out_destroy_fbi:
407 drm_fb_helper_release_fbi(helper);
408out_gfree:
409 drm_gem_object_unreference_unlocked(&ufbdev->ufb.obj->base);
410out:
411 return ret;
412}
413
414static const struct drm_fb_helper_funcs udl_fb_helper_funcs = {
415 .fb_probe = udlfb_create,
416};
417
418static void udl_fbdev_destroy(struct drm_device *dev,
419 struct udl_fbdev *ufbdev)
420{
421 drm_fb_helper_unregister_fbi(&ufbdev->helper);
422 drm_fb_helper_release_fbi(&ufbdev->helper);
423 drm_fb_helper_fini(&ufbdev->helper);
424 drm_framebuffer_unregister_private(&ufbdev->ufb.base);
425 drm_framebuffer_cleanup(&ufbdev->ufb.base);
426 drm_gem_object_unreference_unlocked(&ufbdev->ufb.obj->base);
427}
428
429int udl_fbdev_init(struct drm_device *dev)
430{
431 struct udl_device *udl = dev->dev_private;
432 int bpp_sel = fb_bpp;
433 struct udl_fbdev *ufbdev;
434 int ret;
435
436 ufbdev = kzalloc(sizeof(struct udl_fbdev), GFP_KERNEL);
437 if (!ufbdev)
438 return -ENOMEM;
439
440 udl->fbdev = ufbdev;
441
442 drm_fb_helper_prepare(dev, &ufbdev->helper, &udl_fb_helper_funcs);
443
444 ret = drm_fb_helper_init(dev, &ufbdev->helper,
445 1, 1);
446 if (ret)
447 goto free;
448
449 ret = drm_fb_helper_single_add_all_connectors(&ufbdev->helper);
450 if (ret)
451 goto fini;
452
453 /* disable all the possible outputs/crtcs before entering KMS mode */
454 drm_helper_disable_unused_functions(dev);
455
456 ret = drm_fb_helper_initial_config(&ufbdev->helper, bpp_sel);
457 if (ret)
458 goto fini;
459
460 return 0;
461
462fini:
463 drm_fb_helper_fini(&ufbdev->helper);
464free:
465 kfree(ufbdev);
466 return ret;
467}
468
469void udl_fbdev_cleanup(struct drm_device *dev)
470{
471 struct udl_device *udl = dev->dev_private;
472 if (!udl->fbdev)
473 return;
474
475 udl_fbdev_destroy(dev, udl->fbdev);
476 kfree(udl->fbdev);
477 udl->fbdev = NULL;
478}
479
480void udl_fbdev_unplug(struct drm_device *dev)
481{
482 struct udl_device *udl = dev->dev_private;
483 struct udl_fbdev *ufbdev;
484 if (!udl->fbdev)
485 return;
486
487 ufbdev = udl->fbdev;
488 drm_fb_helper_unlink_fbi(&ufbdev->helper);
489}
490
491struct drm_framebuffer *
492udl_fb_user_fb_create(struct drm_device *dev,
493 struct drm_file *file,
494 const struct drm_mode_fb_cmd2 *mode_cmd)
495{
496 struct drm_gem_object *obj;
497 struct udl_framebuffer *ufb;
498 int ret;
499 uint32_t size;
500
501 obj = drm_gem_object_lookup(file, mode_cmd->handles[0]);
502 if (obj == NULL)
503 return ERR_PTR(-ENOENT);
504
505 size = mode_cmd->pitches[0] * mode_cmd->height;
506 size = ALIGN(size, PAGE_SIZE);
507
508 if (size > obj->size) {
509 DRM_ERROR("object size not sufficient for fb %d %zu %d %d\n", size, obj->size, mode_cmd->pitches[0], mode_cmd->height);
510 return ERR_PTR(-ENOMEM);
511 }
512
513 ufb = kzalloc(sizeof(*ufb), GFP_KERNEL);
514 if (ufb == NULL)
515 return ERR_PTR(-ENOMEM);
516
517 ret = udl_framebuffer_init(dev, ufb, mode_cmd, to_udl_bo(obj));
518 if (ret) {
519 kfree(ufb);
520 return ERR_PTR(-EINVAL);
521 }
522 return &ufb->base;
523}