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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#include <linux/mem_encrypt.h>
18
19#include <drm/drmP.h>
20#include <drm/drm_crtc.h>
21#include <drm/drm_crtc_helper.h>
22#include "udl_drv.h"
23
24#include <drm/drm_fb_helper.h>
25
26#define DL_DEFIO_WRITE_DELAY (HZ/20) /* fb_deferred_io.delay in jiffies */
27
28static int fb_defio = 0; /* Optionally enable experimental fb_defio mmap support */
29static int fb_bpp = 16;
30
31module_param(fb_bpp, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
32module_param(fb_defio, int, S_IWUSR | S_IRUSR | S_IWGRP | S_IRGRP);
33
34struct udl_fbdev {
35 struct drm_fb_helper helper;
36 struct udl_framebuffer ufb;
37 int fb_count;
38};
39
40#define DL_ALIGN_UP(x, a) ALIGN(x, a)
41#define DL_ALIGN_DOWN(x, a) ALIGN_DOWN(x, 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
81int udl_handle_damage(struct udl_framebuffer *fb, int x, int y,
82 int width, int height)
83{
84 struct drm_device *dev = fb->base.dev;
85 struct udl_device *udl = dev->dev_private;
86 int i, ret;
87 char *cmd;
88 cycles_t start_cycles, end_cycles;
89 int bytes_sent = 0;
90 int bytes_identical = 0;
91 struct urb *urb;
92 int aligned_x;
93 int bpp = fb->base.format->cpp[0];
94
95 if (!fb->active_16)
96 return 0;
97
98 if (!fb->obj->vmapping) {
99 ret = udl_gem_vmap(fb->obj);
100 if (ret == -ENOMEM) {
101 DRM_ERROR("failed to vmap fb\n");
102 return 0;
103 }
104 if (!fb->obj->vmapping) {
105 DRM_ERROR("failed to vmapping\n");
106 return 0;
107 }
108 }
109
110 aligned_x = DL_ALIGN_DOWN(x, sizeof(unsigned long));
111 width = DL_ALIGN_UP(width + (x-aligned_x), sizeof(unsigned long));
112 x = aligned_x;
113
114 if ((width <= 0) ||
115 (x + width > fb->base.width) ||
116 (y + height > fb->base.height))
117 return -EINVAL;
118
119 start_cycles = get_cycles();
120
121 urb = udl_get_urb(dev);
122 if (!urb)
123 return 0;
124 cmd = urb->transfer_buffer;
125
126 for (i = y; i < y + height ; i++) {
127 const int line_offset = fb->base.pitches[0] * i;
128 const int byte_offset = line_offset + (x * bpp);
129 const int dev_byte_offset = (fb->base.width * bpp * i) + (x * bpp);
130 if (udl_render_hline(dev, bpp, &urb,
131 (char *) fb->obj->vmapping,
132 &cmd, byte_offset, dev_byte_offset,
133 width * bpp,
134 &bytes_identical, &bytes_sent))
135 goto error;
136 }
137
138 if (cmd > (char *) urb->transfer_buffer) {
139 /* Send partial buffer remaining before exiting */
140 int len = cmd - (char *) urb->transfer_buffer;
141 ret = udl_submit_urb(dev, urb, len);
142 bytes_sent += len;
143 } else
144 udl_urb_completion(urb);
145
146error:
147 atomic_add(bytes_sent, &udl->bytes_sent);
148 atomic_add(bytes_identical, &udl->bytes_identical);
149 atomic_add(width*height*bpp, &udl->bytes_rendered);
150 end_cycles = get_cycles();
151 atomic_add(((unsigned int) ((end_cycles - start_cycles)
152 >> 10)), /* Kcycles */
153 &udl->cpu_kcycles_used);
154
155 return 0;
156}
157
158static int udl_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
159{
160 unsigned long start = vma->vm_start;
161 unsigned long size = vma->vm_end - vma->vm_start;
162 unsigned long offset;
163 unsigned long page, pos;
164
165 if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
166 return -EINVAL;
167
168 offset = vma->vm_pgoff << PAGE_SHIFT;
169
170 if (offset > info->fix.smem_len || size > info->fix.smem_len - offset)
171 return -EINVAL;
172
173 pos = (unsigned long)info->fix.smem_start + offset;
174
175 pr_notice("mmap() framebuffer addr:%lu size:%lu\n",
176 pos, size);
177
178 /* We don't want the framebuffer to be mapped encrypted */
179 vma->vm_page_prot = pgprot_decrypted(vma->vm_page_prot);
180
181 while (size > 0) {
182 page = vmalloc_to_pfn((void *)pos);
183 if (remap_pfn_range(vma, start, page, PAGE_SIZE, PAGE_SHARED))
184 return -EAGAIN;
185
186 start += PAGE_SIZE;
187 pos += PAGE_SIZE;
188 if (size > PAGE_SIZE)
189 size -= PAGE_SIZE;
190 else
191 size = 0;
192 }
193
194 /* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */
195 return 0;
196}
197
198/*
199 * It's common for several clients to have framebuffer open simultaneously.
200 * e.g. both fbcon and X. Makes things interesting.
201 * Assumes caller is holding info->lock (for open and release at least)
202 */
203static int udl_fb_open(struct fb_info *info, int user)
204{
205 struct udl_fbdev *ufbdev = info->par;
206 struct drm_device *dev = ufbdev->ufb.base.dev;
207 struct udl_device *udl = dev->dev_private;
208
209 /* If the USB device is gone, we don't accept new opens */
210 if (drm_dev_is_unplugged(udl->ddev))
211 return -ENODEV;
212
213 ufbdev->fb_count++;
214
215#ifdef CONFIG_DRM_FBDEV_EMULATION
216 if (fb_defio && (info->fbdefio == NULL)) {
217 /* enable defio at last moment if not disabled by client */
218
219 struct fb_deferred_io *fbdefio;
220
221 fbdefio = kmalloc(sizeof(struct fb_deferred_io), GFP_KERNEL);
222
223 if (fbdefio) {
224 fbdefio->delay = DL_DEFIO_WRITE_DELAY;
225 fbdefio->deferred_io = drm_fb_helper_deferred_io;
226 }
227
228 info->fbdefio = fbdefio;
229 fb_deferred_io_init(info);
230 }
231#endif
232
233 pr_notice("open /dev/fb%d user=%d fb_info=%p count=%d\n",
234 info->node, user, info, ufbdev->fb_count);
235
236 return 0;
237}
238
239
240/*
241 * Assumes caller is holding info->lock mutex (for open and release at least)
242 */
243static int udl_fb_release(struct fb_info *info, int user)
244{
245 struct udl_fbdev *ufbdev = info->par;
246
247 ufbdev->fb_count--;
248
249#ifdef CONFIG_DRM_FBDEV_EMULATION
250 if ((ufbdev->fb_count == 0) && (info->fbdefio)) {
251 fb_deferred_io_cleanup(info);
252 kfree(info->fbdefio);
253 info->fbdefio = NULL;
254 info->fbops->fb_mmap = udl_fb_mmap;
255 }
256#endif
257
258 pr_warn("released /dev/fb%d user=%d count=%d\n",
259 info->node, user, ufbdev->fb_count);
260
261 return 0;
262}
263
264static struct fb_ops udlfb_ops = {
265 .owner = THIS_MODULE,
266 DRM_FB_HELPER_DEFAULT_OPS,
267 .fb_fillrect = drm_fb_helper_sys_fillrect,
268 .fb_copyarea = drm_fb_helper_sys_copyarea,
269 .fb_imageblit = drm_fb_helper_sys_imageblit,
270 .fb_mmap = udl_fb_mmap,
271 .fb_open = udl_fb_open,
272 .fb_release = udl_fb_release,
273};
274
275static int udl_user_framebuffer_dirty(struct drm_framebuffer *fb,
276 struct drm_file *file,
277 unsigned flags, unsigned color,
278 struct drm_clip_rect *clips,
279 unsigned num_clips)
280{
281 struct udl_framebuffer *ufb = to_udl_fb(fb);
282 int i;
283 int ret = 0;
284
285 drm_modeset_lock_all(fb->dev);
286
287 if (!ufb->active_16)
288 goto unlock;
289
290 if (ufb->obj->base.import_attach) {
291 ret = dma_buf_begin_cpu_access(ufb->obj->base.import_attach->dmabuf,
292 DMA_FROM_DEVICE);
293 if (ret)
294 goto unlock;
295 }
296
297 for (i = 0; i < num_clips; i++) {
298 ret = udl_handle_damage(ufb, clips[i].x1, clips[i].y1,
299 clips[i].x2 - clips[i].x1,
300 clips[i].y2 - clips[i].y1);
301 if (ret)
302 break;
303 }
304
305 if (ufb->obj->base.import_attach) {
306 ret = dma_buf_end_cpu_access(ufb->obj->base.import_attach->dmabuf,
307 DMA_FROM_DEVICE);
308 }
309
310 unlock:
311 drm_modeset_unlock_all(fb->dev);
312
313 return ret;
314}
315
316static void udl_user_framebuffer_destroy(struct drm_framebuffer *fb)
317{
318 struct udl_framebuffer *ufb = to_udl_fb(fb);
319
320 if (ufb->obj)
321 drm_gem_object_put_unlocked(&ufb->obj->base);
322
323 drm_framebuffer_cleanup(fb);
324 kfree(ufb);
325}
326
327static const struct drm_framebuffer_funcs udlfb_funcs = {
328 .destroy = udl_user_framebuffer_destroy,
329 .dirty = udl_user_framebuffer_dirty,
330};
331
332
333static int
334udl_framebuffer_init(struct drm_device *dev,
335 struct udl_framebuffer *ufb,
336 const struct drm_mode_fb_cmd2 *mode_cmd,
337 struct udl_gem_object *obj)
338{
339 int ret;
340
341 ufb->obj = obj;
342 drm_helper_mode_fill_fb_struct(dev, &ufb->base, mode_cmd);
343 ret = drm_framebuffer_init(dev, &ufb->base, &udlfb_funcs);
344 return ret;
345}
346
347
348static int udlfb_create(struct drm_fb_helper *helper,
349 struct drm_fb_helper_surface_size *sizes)
350{
351 struct udl_fbdev *ufbdev =
352 container_of(helper, struct udl_fbdev, helper);
353 struct drm_device *dev = ufbdev->helper.dev;
354 struct fb_info *info;
355 struct drm_framebuffer *fb;
356 struct drm_mode_fb_cmd2 mode_cmd;
357 struct udl_gem_object *obj;
358 uint32_t size;
359 int ret = 0;
360
361 if (sizes->surface_bpp == 24)
362 sizes->surface_bpp = 32;
363
364 mode_cmd.width = sizes->surface_width;
365 mode_cmd.height = sizes->surface_height;
366 mode_cmd.pitches[0] = mode_cmd.width * ((sizes->surface_bpp + 7) / 8);
367
368 mode_cmd.pixel_format = drm_mode_legacy_fb_format(sizes->surface_bpp,
369 sizes->surface_depth);
370
371 size = mode_cmd.pitches[0] * mode_cmd.height;
372 size = ALIGN(size, PAGE_SIZE);
373
374 obj = udl_gem_alloc_object(dev, size);
375 if (!obj)
376 goto out;
377
378 ret = udl_gem_vmap(obj);
379 if (ret) {
380 DRM_ERROR("failed to vmap fb\n");
381 goto out_gfree;
382 }
383
384 info = drm_fb_helper_alloc_fbi(helper);
385 if (IS_ERR(info)) {
386 ret = PTR_ERR(info);
387 goto out_gfree;
388 }
389 info->par = ufbdev;
390
391 ret = udl_framebuffer_init(dev, &ufbdev->ufb, &mode_cmd, obj);
392 if (ret)
393 goto out_gfree;
394
395 fb = &ufbdev->ufb.base;
396
397 ufbdev->helper.fb = fb;
398
399 strcpy(info->fix.id, "udldrmfb");
400
401 info->screen_base = ufbdev->ufb.obj->vmapping;
402 info->fix.smem_len = size;
403 info->fix.smem_start = (unsigned long)ufbdev->ufb.obj->vmapping;
404
405 info->fbops = &udlfb_ops;
406 drm_fb_helper_fill_fix(info, fb->pitches[0], fb->format->depth);
407 drm_fb_helper_fill_var(info, &ufbdev->helper, sizes->fb_width, sizes->fb_height);
408
409 DRM_DEBUG_KMS("allocated %dx%d vmal %p\n",
410 fb->width, fb->height,
411 ufbdev->ufb.obj->vmapping);
412
413 return ret;
414out_gfree:
415 drm_gem_object_put_unlocked(&ufbdev->ufb.obj->base);
416out:
417 return ret;
418}
419
420static const struct drm_fb_helper_funcs udl_fb_helper_funcs = {
421 .fb_probe = udlfb_create,
422};
423
424static void udl_fbdev_destroy(struct drm_device *dev,
425 struct udl_fbdev *ufbdev)
426{
427 drm_fb_helper_unregister_fbi(&ufbdev->helper);
428 drm_fb_helper_fini(&ufbdev->helper);
429 drm_framebuffer_unregister_private(&ufbdev->ufb.base);
430 drm_framebuffer_cleanup(&ufbdev->ufb.base);
431 drm_gem_object_put_unlocked(&ufbdev->ufb.obj->base);
432}
433
434int udl_fbdev_init(struct drm_device *dev)
435{
436 struct udl_device *udl = dev->dev_private;
437 int bpp_sel = fb_bpp;
438 struct udl_fbdev *ufbdev;
439 int ret;
440
441 ufbdev = kzalloc(sizeof(struct udl_fbdev), GFP_KERNEL);
442 if (!ufbdev)
443 return -ENOMEM;
444
445 udl->fbdev = ufbdev;
446
447 drm_fb_helper_prepare(dev, &ufbdev->helper, &udl_fb_helper_funcs);
448
449 ret = drm_fb_helper_init(dev, &ufbdev->helper, 1);
450 if (ret)
451 goto free;
452
453 ret = drm_fb_helper_single_add_all_connectors(&ufbdev->helper);
454 if (ret)
455 goto fini;
456
457 /* disable all the possible outputs/crtcs before entering KMS mode */
458 drm_helper_disable_unused_functions(dev);
459
460 ret = drm_fb_helper_initial_config(&ufbdev->helper, bpp_sel);
461 if (ret)
462 goto fini;
463
464 return 0;
465
466fini:
467 drm_fb_helper_fini(&ufbdev->helper);
468free:
469 kfree(ufbdev);
470 return ret;
471}
472
473void udl_fbdev_cleanup(struct drm_device *dev)
474{
475 struct udl_device *udl = dev->dev_private;
476 if (!udl->fbdev)
477 return;
478
479 udl_fbdev_destroy(dev, udl->fbdev);
480 kfree(udl->fbdev);
481 udl->fbdev = NULL;
482}
483
484void udl_fbdev_unplug(struct drm_device *dev)
485{
486 struct udl_device *udl = dev->dev_private;
487 struct udl_fbdev *ufbdev;
488 if (!udl->fbdev)
489 return;
490
491 ufbdev = udl->fbdev;
492 drm_fb_helper_unlink_fbi(&ufbdev->helper);
493}
494
495struct drm_framebuffer *
496udl_fb_user_fb_create(struct drm_device *dev,
497 struct drm_file *file,
498 const struct drm_mode_fb_cmd2 *mode_cmd)
499{
500 struct drm_gem_object *obj;
501 struct udl_framebuffer *ufb;
502 int ret;
503 uint32_t size;
504
505 obj = drm_gem_object_lookup(file, mode_cmd->handles[0]);
506 if (obj == NULL)
507 return ERR_PTR(-ENOENT);
508
509 size = mode_cmd->pitches[0] * mode_cmd->height;
510 size = ALIGN(size, PAGE_SIZE);
511
512 if (size > obj->size) {
513 DRM_ERROR("object size not sufficient for fb %d %zu %d %d\n", size, obj->size, mode_cmd->pitches[0], mode_cmd->height);
514 return ERR_PTR(-ENOMEM);
515 }
516
517 ufb = kzalloc(sizeof(*ufb), GFP_KERNEL);
518 if (ufb == NULL)
519 return ERR_PTR(-ENOMEM);
520
521 ret = udl_framebuffer_init(dev, ufb, mode_cmd, to_udl_bo(obj));
522 if (ret) {
523 kfree(ufb);
524 return ERR_PTR(-EINVAL);
525 }
526 return &ufb->base;
527}