1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2012 Samsung Electronics Co.Ltd
4 * Authors: Joonyoung Shim <jy0922.shim@samsung.com>
5 */
6
7 #include <linux/refcount.h>
8 #include <linux/clk.h>
9 #include <linux/component.h>
10 #include <linux/delay.h>
11 #include <linux/dma-mapping.h>
12 #include <linux/err.h>
13 #include <linux/interrupt.h>
14 #include <linux/io.h>
15 #include <linux/kernel.h>
16 #include <linux/of.h>
17 #include <linux/platform_device.h>
18 #include <linux/pm_runtime.h>
19 #include <linux/slab.h>
20 #include <linux/uaccess.h>
21 #include <linux/workqueue.h>
22
23 #include <drm/drm_file.h>
24 #include <drm/exynos_drm.h>
25
26 #include "exynos_drm_drv.h"
27 #include "exynos_drm_g2d.h"
28 #include "exynos_drm_gem.h"
29
30 #define G2D_HW_MAJOR_VER 4
31 #define G2D_HW_MINOR_VER 1
32
33 /* vaild register range set from user: 0x0104 ~ 0x0880 */
34 #define G2D_VALID_START 0x0104
35 #define G2D_VALID_END 0x0880
36
37 /* general registers */
38 #define G2D_SOFT_RESET 0x0000
39 #define G2D_INTEN 0x0004
40 #define G2D_INTC_PEND 0x000C
41 #define G2D_DMA_SFR_BASE_ADDR 0x0080
42 #define G2D_DMA_COMMAND 0x0084
43 #define G2D_DMA_STATUS 0x008C
44 #define G2D_DMA_HOLD_CMD 0x0090
45
46 /* command registers */
47 #define G2D_BITBLT_START 0x0100
48
49 /* registers for base address */
50 #define G2D_SRC_BASE_ADDR 0x0304
51 #define G2D_SRC_STRIDE 0x0308
52 #define G2D_SRC_COLOR_MODE 0x030C
53 #define G2D_SRC_LEFT_TOP 0x0310
54 #define G2D_SRC_RIGHT_BOTTOM 0x0314
55 #define G2D_SRC_PLANE2_BASE_ADDR 0x0318
56 #define G2D_DST_BASE_ADDR 0x0404
57 #define G2D_DST_STRIDE 0x0408
58 #define G2D_DST_COLOR_MODE 0x040C
59 #define G2D_DST_LEFT_TOP 0x0410
60 #define G2D_DST_RIGHT_BOTTOM 0x0414
61 #define G2D_DST_PLANE2_BASE_ADDR 0x0418
62 #define G2D_PAT_BASE_ADDR 0x0500
63 #define G2D_MSK_BASE_ADDR 0x0520
64
65 /* G2D_SOFT_RESET */
66 #define G2D_SFRCLEAR (1 << 1)
67 #define G2D_R (1 << 0)
68
69 /* G2D_INTEN */
70 #define G2D_INTEN_ACF (1 << 3)
71 #define G2D_INTEN_UCF (1 << 2)
72 #define G2D_INTEN_GCF (1 << 1)
73 #define G2D_INTEN_SCF (1 << 0)
74
75 /* G2D_INTC_PEND */
76 #define G2D_INTP_ACMD_FIN (1 << 3)
77 #define G2D_INTP_UCMD_FIN (1 << 2)
78 #define G2D_INTP_GCMD_FIN (1 << 1)
79 #define G2D_INTP_SCMD_FIN (1 << 0)
80
81 /* G2D_DMA_COMMAND */
82 #define G2D_DMA_HALT (1 << 2)
83 #define G2D_DMA_CONTINUE (1 << 1)
84 #define G2D_DMA_START (1 << 0)
85
86 /* G2D_DMA_STATUS */
87 #define G2D_DMA_LIST_DONE_COUNT (0xFF << 17)
88 #define G2D_DMA_BITBLT_DONE_COUNT (0xFFFF << 1)
89 #define G2D_DMA_DONE (1 << 0)
90 #define G2D_DMA_LIST_DONE_COUNT_OFFSET 17
91
92 /* G2D_DMA_HOLD_CMD */
93 #define G2D_USER_HOLD (1 << 2)
94 #define G2D_LIST_HOLD (1 << 1)
95 #define G2D_BITBLT_HOLD (1 << 0)
96
97 /* G2D_BITBLT_START */
98 #define G2D_START_CASESEL (1 << 2)
99 #define G2D_START_NHOLT (1 << 1)
100 #define G2D_START_BITBLT (1 << 0)
101
102 /* buffer color format */
103 #define G2D_FMT_XRGB8888 0
104 #define G2D_FMT_ARGB8888 1
105 #define G2D_FMT_RGB565 2
106 #define G2D_FMT_XRGB1555 3
107 #define G2D_FMT_ARGB1555 4
108 #define G2D_FMT_XRGB4444 5
109 #define G2D_FMT_ARGB4444 6
110 #define G2D_FMT_PACKED_RGB888 7
111 #define G2D_FMT_A8 11
112 #define G2D_FMT_L8 12
113
114 /* buffer valid length */
115 #define G2D_LEN_MIN 1
116 #define G2D_LEN_MAX 8000
117
118 #define G2D_CMDLIST_SIZE (PAGE_SIZE / 4)
119 #define G2D_CMDLIST_NUM 64
120 #define G2D_CMDLIST_POOL_SIZE (G2D_CMDLIST_SIZE * G2D_CMDLIST_NUM)
121 #define G2D_CMDLIST_DATA_NUM (G2D_CMDLIST_SIZE / sizeof(u32) - 2)
122
123 /* maximum buffer pool size of userptr is 64MB as default */
124 #define MAX_POOL (64 * 1024 * 1024)
125
126 enum {
127 BUF_TYPE_GEM = 1,
128 BUF_TYPE_USERPTR,
129 };
130
131 enum g2d_reg_type {
132 REG_TYPE_NONE = -1,
133 REG_TYPE_SRC,
134 REG_TYPE_SRC_PLANE2,
135 REG_TYPE_DST,
136 REG_TYPE_DST_PLANE2,
137 REG_TYPE_PAT,
138 REG_TYPE_MSK,
139 MAX_REG_TYPE_NR
140 };
141
142 enum g2d_flag_bits {
143 /*
144 * If set, suspends the runqueue worker after the currently
145 * processed node is finished.
146 */
147 G2D_BIT_SUSPEND_RUNQUEUE,
148 /*
149 * If set, indicates that the engine is currently busy.
150 */
151 G2D_BIT_ENGINE_BUSY,
152 };
153
154 /* cmdlist data structure */
155 struct g2d_cmdlist {
156 u32 head;
157 unsigned long data[G2D_CMDLIST_DATA_NUM];
158 u32 last; /* last data offset */
159 };
160
161 /*
162 * A structure of buffer description
163 *
164 * @format: color format
165 * @stride: buffer stride/pitch in bytes
166 * @left_x: the x coordinates of left top corner
167 * @top_y: the y coordinates of left top corner
168 * @right_x: the x coordinates of right bottom corner
169 * @bottom_y: the y coordinates of right bottom corner
170 *
171 */
172 struct g2d_buf_desc {
173 unsigned int format;
174 unsigned int stride;
175 unsigned int left_x;
176 unsigned int top_y;
177 unsigned int right_x;
178 unsigned int bottom_y;
179 };
180
181 /*
182 * A structure of buffer information
183 *
184 * @map_nr: manages the number of mapped buffers
185 * @reg_types: stores regitster type in the order of requested command
186 * @handles: stores buffer handle in its reg_type position
187 * @types: stores buffer type in its reg_type position
188 * @descs: stores buffer description in its reg_type position
189 *
190 */
191 struct g2d_buf_info {
192 unsigned int map_nr;
193 enum g2d_reg_type reg_types[MAX_REG_TYPE_NR];
194 void *obj[MAX_REG_TYPE_NR];
195 unsigned int types[MAX_REG_TYPE_NR];
196 struct g2d_buf_desc descs[MAX_REG_TYPE_NR];
197 };
198
199 struct drm_exynos_pending_g2d_event {
200 struct drm_pending_event base;
201 struct drm_exynos_g2d_event event;
202 };
203
204 struct g2d_cmdlist_userptr {
205 struct list_head list;
206 dma_addr_t dma_addr;
207 unsigned long userptr;
208 unsigned long size;
209 struct page **pages;
210 unsigned int npages;
211 struct sg_table *sgt;
212 refcount_t refcount;
213 bool in_pool;
214 bool out_of_list;
215 };
216 struct g2d_cmdlist_node {
217 struct list_head list;
218 struct g2d_cmdlist *cmdlist;
219 dma_addr_t dma_addr;
220 struct g2d_buf_info buf_info;
221
222 struct drm_exynos_pending_g2d_event *event;
223 };
224
225 struct g2d_runqueue_node {
226 struct list_head list;
227 struct list_head run_cmdlist;
228 struct list_head event_list;
229 struct drm_file *filp;
230 pid_t pid;
231 struct completion complete;
232 int async;
233 };
234
235 struct g2d_data {
236 struct device *dev;
237 void *dma_priv;
238 struct clk *gate_clk;
239 void __iomem *regs;
240 int irq;
241 struct workqueue_struct *g2d_workq;
242 struct work_struct runqueue_work;
243 struct drm_device *drm_dev;
244 unsigned long flags;
245
246 /* cmdlist */
247 struct g2d_cmdlist_node *cmdlist_node;
248 struct list_head free_cmdlist;
249 struct mutex cmdlist_mutex;
250 dma_addr_t cmdlist_pool;
251 void *cmdlist_pool_virt;
252 unsigned long cmdlist_dma_attrs;
253
254 /* runqueue*/
255 struct g2d_runqueue_node *runqueue_node;
256 struct list_head runqueue;
257 struct mutex runqueue_mutex;
258 struct kmem_cache *runqueue_slab;
259
260 unsigned long current_pool;
261 unsigned long max_pool;
262 };
263
g2d_hw_reset(struct g2d_data * g2d)264 static inline void g2d_hw_reset(struct g2d_data *g2d)
265 {
266 writel(G2D_R | G2D_SFRCLEAR, g2d->regs + G2D_SOFT_RESET);
267 clear_bit(G2D_BIT_ENGINE_BUSY, &g2d->flags);
268 }
269
g2d_init_cmdlist(struct g2d_data * g2d)270 static int g2d_init_cmdlist(struct g2d_data *g2d)
271 {
272 struct device *dev = g2d->dev;
273 struct g2d_cmdlist_node *node;
274 int nr;
275 int ret;
276 struct g2d_buf_info *buf_info;
277
278 g2d->cmdlist_dma_attrs = DMA_ATTR_WRITE_COMBINE;
279
280 g2d->cmdlist_pool_virt = dma_alloc_attrs(to_dma_dev(g2d->drm_dev),
281 G2D_CMDLIST_POOL_SIZE,
282 &g2d->cmdlist_pool, GFP_KERNEL,
283 g2d->cmdlist_dma_attrs);
284 if (!g2d->cmdlist_pool_virt) {
285 dev_err(dev, "failed to allocate dma memory\n");
286 return -ENOMEM;
287 }
288
289 node = kcalloc(G2D_CMDLIST_NUM, sizeof(*node), GFP_KERNEL);
290 if (!node) {
291 ret = -ENOMEM;
292 goto err;
293 }
294
295 for (nr = 0; nr < G2D_CMDLIST_NUM; nr++) {
296 unsigned int i;
297
298 node[nr].cmdlist =
299 g2d->cmdlist_pool_virt + nr * G2D_CMDLIST_SIZE;
300 node[nr].dma_addr =
301 g2d->cmdlist_pool + nr * G2D_CMDLIST_SIZE;
302
303 buf_info = &node[nr].buf_info;
304 for (i = 0; i < MAX_REG_TYPE_NR; i++)
305 buf_info->reg_types[i] = REG_TYPE_NONE;
306
307 list_add_tail(&node[nr].list, &g2d->free_cmdlist);
308 }
309
310 return 0;
311
312 err:
313 dma_free_attrs(to_dma_dev(g2d->drm_dev), G2D_CMDLIST_POOL_SIZE,
314 g2d->cmdlist_pool_virt,
315 g2d->cmdlist_pool, g2d->cmdlist_dma_attrs);
316 return ret;
317 }
318
g2d_fini_cmdlist(struct g2d_data * g2d)319 static void g2d_fini_cmdlist(struct g2d_data *g2d)
320 {
321 kfree(g2d->cmdlist_node);
322
323 if (g2d->cmdlist_pool_virt && g2d->cmdlist_pool) {
324 dma_free_attrs(to_dma_dev(g2d->drm_dev),
325 G2D_CMDLIST_POOL_SIZE,
326 g2d->cmdlist_pool_virt,
327 g2d->cmdlist_pool, g2d->cmdlist_dma_attrs);
328 }
329 }
330
g2d_get_cmdlist(struct g2d_data * g2d)331 static struct g2d_cmdlist_node *g2d_get_cmdlist(struct g2d_data *g2d)
332 {
333 struct device *dev = g2d->dev;
334 struct g2d_cmdlist_node *node;
335
336 mutex_lock(&g2d->cmdlist_mutex);
337 if (list_empty(&g2d->free_cmdlist)) {
338 dev_err(dev, "there is no free cmdlist\n");
339 mutex_unlock(&g2d->cmdlist_mutex);
340 return NULL;
341 }
342
343 node = list_first_entry(&g2d->free_cmdlist, struct g2d_cmdlist_node,
344 list);
345 list_del_init(&node->list);
346 mutex_unlock(&g2d->cmdlist_mutex);
347
348 return node;
349 }
350
g2d_put_cmdlist(struct g2d_data * g2d,struct g2d_cmdlist_node * node)351 static void g2d_put_cmdlist(struct g2d_data *g2d, struct g2d_cmdlist_node *node)
352 {
353 mutex_lock(&g2d->cmdlist_mutex);
354 list_move_tail(&node->list, &g2d->free_cmdlist);
355 mutex_unlock(&g2d->cmdlist_mutex);
356 }
357
g2d_add_cmdlist_to_inuse(struct drm_exynos_file_private * file_priv,struct g2d_cmdlist_node * node)358 static void g2d_add_cmdlist_to_inuse(struct drm_exynos_file_private *file_priv,
359 struct g2d_cmdlist_node *node)
360 {
361 struct g2d_cmdlist_node *lnode;
362
363 if (list_empty(&file_priv->inuse_cmdlist))
364 goto add_to_list;
365
366 /* this links to base address of new cmdlist */
367 lnode = list_entry(file_priv->inuse_cmdlist.prev,
368 struct g2d_cmdlist_node, list);
369 lnode->cmdlist->data[lnode->cmdlist->last] = node->dma_addr;
370
371 add_to_list:
372 list_add_tail(&node->list, &file_priv->inuse_cmdlist);
373
374 if (node->event)
375 list_add_tail(&node->event->base.link, &file_priv->event_list);
376 }
377
g2d_userptr_put_dma_addr(struct g2d_data * g2d,void * obj,bool force)378 static void g2d_userptr_put_dma_addr(struct g2d_data *g2d,
379 void *obj,
380 bool force)
381 {
382 struct g2d_cmdlist_userptr *g2d_userptr = obj;
383
384 if (!obj)
385 return;
386
387 if (force)
388 goto out;
389
390 refcount_dec(&g2d_userptr->refcount);
391
392 if (refcount_read(&g2d_userptr->refcount) > 0)
393 return;
394
395 if (g2d_userptr->in_pool)
396 return;
397
398 out:
399 dma_unmap_sgtable(to_dma_dev(g2d->drm_dev), g2d_userptr->sgt,
400 DMA_BIDIRECTIONAL, 0);
401
402 unpin_user_pages_dirty_lock(g2d_userptr->pages, g2d_userptr->npages,
403 true);
404 kvfree(g2d_userptr->pages);
405
406 if (!g2d_userptr->out_of_list)
407 list_del_init(&g2d_userptr->list);
408
409 sg_free_table(g2d_userptr->sgt);
410 kfree(g2d_userptr->sgt);
411 kfree(g2d_userptr);
412 }
413
g2d_userptr_get_dma_addr(struct g2d_data * g2d,unsigned long userptr,unsigned long size,struct drm_file * filp,void ** obj)414 static dma_addr_t *g2d_userptr_get_dma_addr(struct g2d_data *g2d,
415 unsigned long userptr,
416 unsigned long size,
417 struct drm_file *filp,
418 void **obj)
419 {
420 struct drm_exynos_file_private *file_priv = filp->driver_priv;
421 struct g2d_cmdlist_userptr *g2d_userptr;
422 struct sg_table *sgt;
423 unsigned long start, end;
424 unsigned int npages, offset;
425 int ret;
426
427 if (!size) {
428 DRM_DEV_ERROR(g2d->dev, "invalid userptr size.\n");
429 return ERR_PTR(-EINVAL);
430 }
431
432 /* check if userptr already exists in userptr_list. */
433 list_for_each_entry(g2d_userptr, &file_priv->userptr_list, list) {
434 if (g2d_userptr->userptr == userptr) {
435 /*
436 * also check size because there could be same address
437 * and different size.
438 */
439 if (g2d_userptr->size == size) {
440 refcount_inc(&g2d_userptr->refcount);
441 *obj = g2d_userptr;
442
443 return &g2d_userptr->dma_addr;
444 }
445
446 /*
447 * at this moment, maybe g2d dma is accessing this
448 * g2d_userptr memory region so just remove this
449 * g2d_userptr object from userptr_list not to be
450 * referred again and also except it the userptr
451 * pool to be released after the dma access completion.
452 */
453 g2d_userptr->out_of_list = true;
454 g2d_userptr->in_pool = false;
455 list_del_init(&g2d_userptr->list);
456
457 break;
458 }
459 }
460
461 g2d_userptr = kzalloc(sizeof(*g2d_userptr), GFP_KERNEL);
462 if (!g2d_userptr)
463 return ERR_PTR(-ENOMEM);
464
465 refcount_set(&g2d_userptr->refcount, 1);
466 g2d_userptr->size = size;
467
468 start = userptr & PAGE_MASK;
469 offset = userptr & ~PAGE_MASK;
470 end = PAGE_ALIGN(userptr + size);
471 npages = (end - start) >> PAGE_SHIFT;
472 g2d_userptr->pages = kvmalloc_array(npages, sizeof(*g2d_userptr->pages),
473 GFP_KERNEL);
474 if (!g2d_userptr->pages) {
475 ret = -ENOMEM;
476 goto err_free;
477 }
478
479 ret = pin_user_pages_fast(start, npages,
480 FOLL_WRITE | FOLL_LONGTERM,
481 g2d_userptr->pages);
482 if (ret != npages) {
483 DRM_DEV_ERROR(g2d->dev,
484 "failed to get user pages from userptr.\n");
485 if (ret < 0)
486 goto err_destroy_pages;
487 npages = ret;
488 ret = -EFAULT;
489 goto err_unpin_pages;
490 }
491 g2d_userptr->npages = npages;
492
493 sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
494 if (!sgt) {
495 ret = -ENOMEM;
496 goto err_unpin_pages;
497 }
498
499 ret = sg_alloc_table_from_pages(sgt,
500 g2d_userptr->pages,
501 npages, offset, size, GFP_KERNEL);
502 if (ret < 0) {
503 DRM_DEV_ERROR(g2d->dev, "failed to get sgt from pages.\n");
504 goto err_free_sgt;
505 }
506
507 g2d_userptr->sgt = sgt;
508
509 ret = dma_map_sgtable(to_dma_dev(g2d->drm_dev), sgt,
510 DMA_BIDIRECTIONAL, 0);
511 if (ret) {
512 DRM_DEV_ERROR(g2d->dev, "failed to map sgt with dma region.\n");
513 goto err_sg_free_table;
514 }
515
516 g2d_userptr->dma_addr = sgt->sgl[0].dma_address;
517 g2d_userptr->userptr = userptr;
518
519 list_add_tail(&g2d_userptr->list, &file_priv->userptr_list);
520
521 if (g2d->current_pool + (npages << PAGE_SHIFT) < g2d->max_pool) {
522 g2d->current_pool += npages << PAGE_SHIFT;
523 g2d_userptr->in_pool = true;
524 }
525
526 *obj = g2d_userptr;
527
528 return &g2d_userptr->dma_addr;
529
530 err_sg_free_table:
531 sg_free_table(sgt);
532
533 err_free_sgt:
534 kfree(sgt);
535
536 err_unpin_pages:
537 unpin_user_pages(g2d_userptr->pages, npages);
538
539 err_destroy_pages:
540 kvfree(g2d_userptr->pages);
541
542 err_free:
543 kfree(g2d_userptr);
544
545 return ERR_PTR(ret);
546 }
547
g2d_userptr_free_all(struct g2d_data * g2d,struct drm_file * filp)548 static void g2d_userptr_free_all(struct g2d_data *g2d, struct drm_file *filp)
549 {
550 struct drm_exynos_file_private *file_priv = filp->driver_priv;
551 struct g2d_cmdlist_userptr *g2d_userptr, *n;
552
553 list_for_each_entry_safe(g2d_userptr, n, &file_priv->userptr_list, list)
554 if (g2d_userptr->in_pool)
555 g2d_userptr_put_dma_addr(g2d, g2d_userptr, true);
556
557 g2d->current_pool = 0;
558 }
559
g2d_get_reg_type(struct g2d_data * g2d,int reg_offset)560 static enum g2d_reg_type g2d_get_reg_type(struct g2d_data *g2d, int reg_offset)
561 {
562 enum g2d_reg_type reg_type;
563
564 switch (reg_offset) {
565 case G2D_SRC_BASE_ADDR:
566 case G2D_SRC_STRIDE:
567 case G2D_SRC_COLOR_MODE:
568 case G2D_SRC_LEFT_TOP:
569 case G2D_SRC_RIGHT_BOTTOM:
570 reg_type = REG_TYPE_SRC;
571 break;
572 case G2D_SRC_PLANE2_BASE_ADDR:
573 reg_type = REG_TYPE_SRC_PLANE2;
574 break;
575 case G2D_DST_BASE_ADDR:
576 case G2D_DST_STRIDE:
577 case G2D_DST_COLOR_MODE:
578 case G2D_DST_LEFT_TOP:
579 case G2D_DST_RIGHT_BOTTOM:
580 reg_type = REG_TYPE_DST;
581 break;
582 case G2D_DST_PLANE2_BASE_ADDR:
583 reg_type = REG_TYPE_DST_PLANE2;
584 break;
585 case G2D_PAT_BASE_ADDR:
586 reg_type = REG_TYPE_PAT;
587 break;
588 case G2D_MSK_BASE_ADDR:
589 reg_type = REG_TYPE_MSK;
590 break;
591 default:
592 reg_type = REG_TYPE_NONE;
593 DRM_DEV_ERROR(g2d->dev, "Unknown register offset![%d]\n",
594 reg_offset);
595 break;
596 }
597
598 return reg_type;
599 }
600
g2d_get_buf_bpp(unsigned int format)601 static unsigned long g2d_get_buf_bpp(unsigned int format)
602 {
603 unsigned long bpp;
604
605 switch (format) {
606 case G2D_FMT_XRGB8888:
607 case G2D_FMT_ARGB8888:
608 bpp = 4;
609 break;
610 case G2D_FMT_RGB565:
611 case G2D_FMT_XRGB1555:
612 case G2D_FMT_ARGB1555:
613 case G2D_FMT_XRGB4444:
614 case G2D_FMT_ARGB4444:
615 bpp = 2;
616 break;
617 case G2D_FMT_PACKED_RGB888:
618 bpp = 3;
619 break;
620 default:
621 bpp = 1;
622 break;
623 }
624
625 return bpp;
626 }
627
g2d_check_buf_desc_is_valid(struct g2d_data * g2d,struct g2d_buf_desc * buf_desc,enum g2d_reg_type reg_type,unsigned long size)628 static bool g2d_check_buf_desc_is_valid(struct g2d_data *g2d,
629 struct g2d_buf_desc *buf_desc,
630 enum g2d_reg_type reg_type,
631 unsigned long size)
632 {
633 int width, height;
634 unsigned long bpp, last_pos;
635
636 /*
637 * check source and destination buffers only.
638 * so the others are always valid.
639 */
640 if (reg_type != REG_TYPE_SRC && reg_type != REG_TYPE_DST)
641 return true;
642
643 /* This check also makes sure that right_x > left_x. */
644 width = (int)buf_desc->right_x - (int)buf_desc->left_x;
645 if (width < G2D_LEN_MIN || width > G2D_LEN_MAX) {
646 DRM_DEV_ERROR(g2d->dev, "width[%d] is out of range!\n", width);
647 return false;
648 }
649
650 /* This check also makes sure that bottom_y > top_y. */
651 height = (int)buf_desc->bottom_y - (int)buf_desc->top_y;
652 if (height < G2D_LEN_MIN || height > G2D_LEN_MAX) {
653 DRM_DEV_ERROR(g2d->dev,
654 "height[%d] is out of range!\n", height);
655 return false;
656 }
657
658 bpp = g2d_get_buf_bpp(buf_desc->format);
659
660 /* Compute the position of the last byte that the engine accesses. */
661 last_pos = ((unsigned long)buf_desc->bottom_y - 1) *
662 (unsigned long)buf_desc->stride +
663 (unsigned long)buf_desc->right_x * bpp - 1;
664
665 /*
666 * Since right_x > left_x and bottom_y > top_y we already know
667 * that the first_pos < last_pos (first_pos being the position
668 * of the first byte the engine accesses), it just remains to
669 * check if last_pos is smaller then the buffer size.
670 */
671
672 if (last_pos >= size) {
673 DRM_DEV_ERROR(g2d->dev, "last engine access position [%lu] "
674 "is out of range [%lu]!\n", last_pos, size);
675 return false;
676 }
677
678 return true;
679 }
680
g2d_map_cmdlist_gem(struct g2d_data * g2d,struct g2d_cmdlist_node * node,struct drm_device * drm_dev,struct drm_file * file)681 static int g2d_map_cmdlist_gem(struct g2d_data *g2d,
682 struct g2d_cmdlist_node *node,
683 struct drm_device *drm_dev,
684 struct drm_file *file)
685 {
686 struct g2d_cmdlist *cmdlist = node->cmdlist;
687 struct g2d_buf_info *buf_info = &node->buf_info;
688 int offset;
689 int ret;
690 int i;
691
692 for (i = 0; i < buf_info->map_nr; i++) {
693 struct g2d_buf_desc *buf_desc;
694 enum g2d_reg_type reg_type;
695 int reg_pos;
696 unsigned long handle;
697 dma_addr_t *addr;
698
699 reg_pos = cmdlist->last - 2 * (i + 1);
700
701 offset = cmdlist->data[reg_pos];
702 handle = cmdlist->data[reg_pos + 1];
703
704 reg_type = g2d_get_reg_type(g2d, offset);
705 if (reg_type == REG_TYPE_NONE) {
706 ret = -EFAULT;
707 goto err;
708 }
709
710 buf_desc = &buf_info->descs[reg_type];
711
712 if (buf_info->types[reg_type] == BUF_TYPE_GEM) {
713 struct exynos_drm_gem *exynos_gem;
714
715 exynos_gem = exynos_drm_gem_get(file, handle);
716 if (!exynos_gem) {
717 ret = -EFAULT;
718 goto err;
719 }
720
721 if (!g2d_check_buf_desc_is_valid(g2d, buf_desc,
722 reg_type, exynos_gem->size)) {
723 exynos_drm_gem_put(exynos_gem);
724 ret = -EFAULT;
725 goto err;
726 }
727
728 addr = &exynos_gem->dma_addr;
729 buf_info->obj[reg_type] = exynos_gem;
730 } else {
731 struct drm_exynos_g2d_userptr g2d_userptr;
732
733 if (copy_from_user(&g2d_userptr, (void __user *)handle,
734 sizeof(struct drm_exynos_g2d_userptr))) {
735 ret = -EFAULT;
736 goto err;
737 }
738
739 if (!g2d_check_buf_desc_is_valid(g2d, buf_desc,
740 reg_type,
741 g2d_userptr.size)) {
742 ret = -EFAULT;
743 goto err;
744 }
745
746 addr = g2d_userptr_get_dma_addr(g2d,
747 g2d_userptr.userptr,
748 g2d_userptr.size,
749 file,
750 &buf_info->obj[reg_type]);
751 if (IS_ERR(addr)) {
752 ret = -EFAULT;
753 goto err;
754 }
755 }
756
757 cmdlist->data[reg_pos + 1] = *addr;
758 buf_info->reg_types[i] = reg_type;
759 }
760
761 return 0;
762
763 err:
764 buf_info->map_nr = i;
765 return ret;
766 }
767
g2d_unmap_cmdlist_gem(struct g2d_data * g2d,struct g2d_cmdlist_node * node,struct drm_file * filp)768 static void g2d_unmap_cmdlist_gem(struct g2d_data *g2d,
769 struct g2d_cmdlist_node *node,
770 struct drm_file *filp)
771 {
772 struct g2d_buf_info *buf_info = &node->buf_info;
773 int i;
774
775 for (i = 0; i < buf_info->map_nr; i++) {
776 struct g2d_buf_desc *buf_desc;
777 enum g2d_reg_type reg_type;
778 void *obj;
779
780 reg_type = buf_info->reg_types[i];
781
782 buf_desc = &buf_info->descs[reg_type];
783 obj = buf_info->obj[reg_type];
784
785 if (buf_info->types[reg_type] == BUF_TYPE_GEM)
786 exynos_drm_gem_put(obj);
787 else
788 g2d_userptr_put_dma_addr(g2d, obj, false);
789
790 buf_info->reg_types[i] = REG_TYPE_NONE;
791 buf_info->obj[reg_type] = NULL;
792 buf_info->types[reg_type] = 0;
793 memset(buf_desc, 0x00, sizeof(*buf_desc));
794 }
795
796 buf_info->map_nr = 0;
797 }
798
g2d_dma_start(struct g2d_data * g2d,struct g2d_runqueue_node * runqueue_node)799 static void g2d_dma_start(struct g2d_data *g2d,
800 struct g2d_runqueue_node *runqueue_node)
801 {
802 struct g2d_cmdlist_node *node =
803 list_first_entry(&runqueue_node->run_cmdlist,
804 struct g2d_cmdlist_node, list);
805
806 set_bit(G2D_BIT_ENGINE_BUSY, &g2d->flags);
807 writel_relaxed(node->dma_addr, g2d->regs + G2D_DMA_SFR_BASE_ADDR);
808 writel_relaxed(G2D_DMA_START, g2d->regs + G2D_DMA_COMMAND);
809 }
810
g2d_get_runqueue_node(struct g2d_data * g2d)811 static struct g2d_runqueue_node *g2d_get_runqueue_node(struct g2d_data *g2d)
812 {
813 struct g2d_runqueue_node *runqueue_node;
814
815 if (list_empty(&g2d->runqueue))
816 return NULL;
817
818 runqueue_node = list_first_entry(&g2d->runqueue,
819 struct g2d_runqueue_node, list);
820 list_del_init(&runqueue_node->list);
821 return runqueue_node;
822 }
823
g2d_free_runqueue_node(struct g2d_data * g2d,struct g2d_runqueue_node * runqueue_node)824 static void g2d_free_runqueue_node(struct g2d_data *g2d,
825 struct g2d_runqueue_node *runqueue_node)
826 {
827 struct g2d_cmdlist_node *node;
828
829 mutex_lock(&g2d->cmdlist_mutex);
830 /*
831 * commands in run_cmdlist have been completed so unmap all gem
832 * objects in each command node so that they are unreferenced.
833 */
834 list_for_each_entry(node, &runqueue_node->run_cmdlist, list)
835 g2d_unmap_cmdlist_gem(g2d, node, runqueue_node->filp);
836 list_splice_tail_init(&runqueue_node->run_cmdlist, &g2d->free_cmdlist);
837 mutex_unlock(&g2d->cmdlist_mutex);
838
839 kmem_cache_free(g2d->runqueue_slab, runqueue_node);
840 }
841
842 /**
843 * g2d_remove_runqueue_nodes - remove items from the list of runqueue nodes
844 * @g2d: G2D state object
845 * @file: if not zero, only remove items with this DRM file
846 *
847 * Has to be called under runqueue lock.
848 */
g2d_remove_runqueue_nodes(struct g2d_data * g2d,struct drm_file * file)849 static void g2d_remove_runqueue_nodes(struct g2d_data *g2d, struct drm_file *file)
850 {
851 struct g2d_runqueue_node *node, *n;
852
853 if (list_empty(&g2d->runqueue))
854 return;
855
856 list_for_each_entry_safe(node, n, &g2d->runqueue, list) {
857 if (file && node->filp != file)
858 continue;
859
860 list_del_init(&node->list);
861 g2d_free_runqueue_node(g2d, node);
862 }
863 }
864
g2d_runqueue_worker(struct work_struct * work)865 static void g2d_runqueue_worker(struct work_struct *work)
866 {
867 struct g2d_data *g2d = container_of(work, struct g2d_data,
868 runqueue_work);
869 struct g2d_runqueue_node *runqueue_node;
870
871 /*
872 * The engine is busy and the completion of the current node is going
873 * to poke the runqueue worker, so nothing to do here.
874 */
875 if (test_bit(G2D_BIT_ENGINE_BUSY, &g2d->flags))
876 return;
877
878 mutex_lock(&g2d->runqueue_mutex);
879
880 runqueue_node = g2d->runqueue_node;
881 g2d->runqueue_node = NULL;
882
883 if (runqueue_node) {
884 pm_runtime_mark_last_busy(g2d->dev);
885 pm_runtime_put_autosuspend(g2d->dev);
886
887 complete(&runqueue_node->complete);
888 if (runqueue_node->async)
889 g2d_free_runqueue_node(g2d, runqueue_node);
890 }
891
892 if (!test_bit(G2D_BIT_SUSPEND_RUNQUEUE, &g2d->flags)) {
893 g2d->runqueue_node = g2d_get_runqueue_node(g2d);
894
895 if (g2d->runqueue_node) {
896 int ret;
897
898 ret = pm_runtime_resume_and_get(g2d->dev);
899 if (ret < 0) {
900 dev_err(g2d->dev, "failed to enable G2D device.\n");
901 goto out;
902 }
903
904 g2d_dma_start(g2d, g2d->runqueue_node);
905 }
906 }
907
908 out:
909 mutex_unlock(&g2d->runqueue_mutex);
910 }
911
g2d_finish_event(struct g2d_data * g2d,u32 cmdlist_no)912 static void g2d_finish_event(struct g2d_data *g2d, u32 cmdlist_no)
913 {
914 struct drm_device *drm_dev = g2d->drm_dev;
915 struct g2d_runqueue_node *runqueue_node = g2d->runqueue_node;
916 struct drm_exynos_pending_g2d_event *e;
917 struct timespec64 now;
918
919 if (list_empty(&runqueue_node->event_list))
920 return;
921
922 e = list_first_entry(&runqueue_node->event_list,
923 struct drm_exynos_pending_g2d_event, base.link);
924
925 ktime_get_ts64(&now);
926 e->event.tv_sec = now.tv_sec;
927 e->event.tv_usec = now.tv_nsec / NSEC_PER_USEC;
928 e->event.cmdlist_no = cmdlist_no;
929
930 drm_send_event(drm_dev, &e->base);
931 }
932
g2d_irq_handler(int irq,void * dev_id)933 static irqreturn_t g2d_irq_handler(int irq, void *dev_id)
934 {
935 struct g2d_data *g2d = dev_id;
936 u32 pending;
937
938 pending = readl_relaxed(g2d->regs + G2D_INTC_PEND);
939 if (pending)
940 writel_relaxed(pending, g2d->regs + G2D_INTC_PEND);
941
942 if (pending & G2D_INTP_GCMD_FIN) {
943 u32 cmdlist_no = readl_relaxed(g2d->regs + G2D_DMA_STATUS);
944
945 cmdlist_no = (cmdlist_no & G2D_DMA_LIST_DONE_COUNT) >>
946 G2D_DMA_LIST_DONE_COUNT_OFFSET;
947
948 g2d_finish_event(g2d, cmdlist_no);
949
950 writel_relaxed(0, g2d->regs + G2D_DMA_HOLD_CMD);
951 if (!(pending & G2D_INTP_ACMD_FIN)) {
952 writel_relaxed(G2D_DMA_CONTINUE,
953 g2d->regs + G2D_DMA_COMMAND);
954 }
955 }
956
957 if (pending & G2D_INTP_ACMD_FIN) {
958 clear_bit(G2D_BIT_ENGINE_BUSY, &g2d->flags);
959 queue_work(g2d->g2d_workq, &g2d->runqueue_work);
960 }
961
962 return IRQ_HANDLED;
963 }
964
965 /**
966 * g2d_wait_finish - wait for the G2D engine to finish the current runqueue node
967 * @g2d: G2D state object
968 * @file: if not zero, only wait if the current runqueue node belongs
969 * to the DRM file
970 *
971 * Should the engine not become idle after a 100ms timeout, a hardware
972 * reset is issued.
973 */
g2d_wait_finish(struct g2d_data * g2d,struct drm_file * file)974 static void g2d_wait_finish(struct g2d_data *g2d, struct drm_file *file)
975 {
976 struct device *dev = g2d->dev;
977
978 struct g2d_runqueue_node *runqueue_node = NULL;
979 unsigned int tries = 10;
980
981 mutex_lock(&g2d->runqueue_mutex);
982
983 /* If no node is currently processed, we have nothing to do. */
984 if (!g2d->runqueue_node)
985 goto out;
986
987 runqueue_node = g2d->runqueue_node;
988
989 /* Check if the currently processed item belongs to us. */
990 if (file && runqueue_node->filp != file)
991 goto out;
992
993 mutex_unlock(&g2d->runqueue_mutex);
994
995 /* Wait for the G2D engine to finish. */
996 while (tries-- && (g2d->runqueue_node == runqueue_node))
997 mdelay(10);
998
999 mutex_lock(&g2d->runqueue_mutex);
1000
1001 if (g2d->runqueue_node != runqueue_node)
1002 goto out;
1003
1004 dev_err(dev, "wait timed out, resetting engine...\n");
1005 g2d_hw_reset(g2d);
1006
1007 /*
1008 * After the hardware reset of the engine we are going to loose
1009 * the IRQ which triggers the PM runtime put().
1010 * So do this manually here.
1011 */
1012 pm_runtime_mark_last_busy(dev);
1013 pm_runtime_put_autosuspend(dev);
1014
1015 complete(&runqueue_node->complete);
1016 if (runqueue_node->async)
1017 g2d_free_runqueue_node(g2d, runqueue_node);
1018
1019 out:
1020 mutex_unlock(&g2d->runqueue_mutex);
1021 }
1022
g2d_check_reg_offset(struct g2d_data * g2d,struct g2d_cmdlist_node * node,int nr,bool for_addr)1023 static int g2d_check_reg_offset(struct g2d_data *g2d,
1024 struct g2d_cmdlist_node *node,
1025 int nr, bool for_addr)
1026 {
1027 struct g2d_cmdlist *cmdlist = node->cmdlist;
1028 int reg_offset;
1029 int index;
1030 int i;
1031
1032 for (i = 0; i < nr; i++) {
1033 struct g2d_buf_info *buf_info = &node->buf_info;
1034 struct g2d_buf_desc *buf_desc;
1035 enum g2d_reg_type reg_type;
1036 unsigned long value;
1037
1038 index = cmdlist->last - 2 * (i + 1);
1039
1040 reg_offset = cmdlist->data[index] & ~0xfffff000;
1041 if (reg_offset < G2D_VALID_START || reg_offset > G2D_VALID_END)
1042 goto err;
1043 if (reg_offset % 4)
1044 goto err;
1045
1046 switch (reg_offset) {
1047 case G2D_SRC_BASE_ADDR:
1048 case G2D_SRC_PLANE2_BASE_ADDR:
1049 case G2D_DST_BASE_ADDR:
1050 case G2D_DST_PLANE2_BASE_ADDR:
1051 case G2D_PAT_BASE_ADDR:
1052 case G2D_MSK_BASE_ADDR:
1053 if (!for_addr)
1054 goto err;
1055
1056 reg_type = g2d_get_reg_type(g2d, reg_offset);
1057
1058 /* check userptr buffer type. */
1059 if ((cmdlist->data[index] & ~0x7fffffff) >> 31) {
1060 buf_info->types[reg_type] = BUF_TYPE_USERPTR;
1061 cmdlist->data[index] &= ~G2D_BUF_USERPTR;
1062 } else
1063 buf_info->types[reg_type] = BUF_TYPE_GEM;
1064 break;
1065 case G2D_SRC_STRIDE:
1066 case G2D_DST_STRIDE:
1067 if (for_addr)
1068 goto err;
1069
1070 reg_type = g2d_get_reg_type(g2d, reg_offset);
1071
1072 buf_desc = &buf_info->descs[reg_type];
1073 buf_desc->stride = cmdlist->data[index + 1];
1074 break;
1075 case G2D_SRC_COLOR_MODE:
1076 case G2D_DST_COLOR_MODE:
1077 if (for_addr)
1078 goto err;
1079
1080 reg_type = g2d_get_reg_type(g2d, reg_offset);
1081
1082 buf_desc = &buf_info->descs[reg_type];
1083 value = cmdlist->data[index + 1];
1084
1085 buf_desc->format = value & 0xf;
1086 break;
1087 case G2D_SRC_LEFT_TOP:
1088 case G2D_DST_LEFT_TOP:
1089 if (for_addr)
1090 goto err;
1091
1092 reg_type = g2d_get_reg_type(g2d, reg_offset);
1093
1094 buf_desc = &buf_info->descs[reg_type];
1095 value = cmdlist->data[index + 1];
1096
1097 buf_desc->left_x = value & 0x1fff;
1098 buf_desc->top_y = (value & 0x1fff0000) >> 16;
1099 break;
1100 case G2D_SRC_RIGHT_BOTTOM:
1101 case G2D_DST_RIGHT_BOTTOM:
1102 if (for_addr)
1103 goto err;
1104
1105 reg_type = g2d_get_reg_type(g2d, reg_offset);
1106
1107 buf_desc = &buf_info->descs[reg_type];
1108 value = cmdlist->data[index + 1];
1109
1110 buf_desc->right_x = value & 0x1fff;
1111 buf_desc->bottom_y = (value & 0x1fff0000) >> 16;
1112 break;
1113 default:
1114 if (for_addr)
1115 goto err;
1116 break;
1117 }
1118 }
1119
1120 return 0;
1121
1122 err:
1123 dev_err(g2d->dev, "Bad register offset: 0x%lx\n", cmdlist->data[index]);
1124 return -EINVAL;
1125 }
1126
1127 /* ioctl functions */
exynos_g2d_get_ver_ioctl(struct drm_device * drm_dev,void * data,struct drm_file * file)1128 int exynos_g2d_get_ver_ioctl(struct drm_device *drm_dev, void *data,
1129 struct drm_file *file)
1130 {
1131 struct drm_exynos_g2d_get_ver *ver = data;
1132
1133 ver->major = G2D_HW_MAJOR_VER;
1134 ver->minor = G2D_HW_MINOR_VER;
1135
1136 return 0;
1137 }
1138
exynos_g2d_set_cmdlist_ioctl(struct drm_device * drm_dev,void * data,struct drm_file * file)1139 int exynos_g2d_set_cmdlist_ioctl(struct drm_device *drm_dev, void *data,
1140 struct drm_file *file)
1141 {
1142 struct drm_exynos_file_private *file_priv = file->driver_priv;
1143 struct exynos_drm_private *priv = drm_dev->dev_private;
1144 struct g2d_data *g2d = dev_get_drvdata(priv->g2d_dev);
1145 struct drm_exynos_g2d_set_cmdlist *req = data;
1146 struct drm_exynos_g2d_cmd *cmd;
1147 struct drm_exynos_pending_g2d_event *e;
1148 struct g2d_cmdlist_node *node;
1149 struct g2d_cmdlist *cmdlist;
1150 int size;
1151 int ret;
1152
1153 node = g2d_get_cmdlist(g2d);
1154 if (!node)
1155 return -ENOMEM;
1156
1157 /*
1158 * To avoid an integer overflow for the later size computations, we
1159 * enforce a maximum number of submitted commands here. This limit is
1160 * sufficient for all conceivable usage cases of the G2D.
1161 */
1162 if (req->cmd_nr > G2D_CMDLIST_DATA_NUM ||
1163 req->cmd_buf_nr > G2D_CMDLIST_DATA_NUM) {
1164 dev_err(g2d->dev, "number of submitted G2D commands exceeds limit\n");
1165 return -EINVAL;
1166 }
1167
1168 node->event = NULL;
1169
1170 if (req->event_type != G2D_EVENT_NOT) {
1171 e = kzalloc(sizeof(*node->event), GFP_KERNEL);
1172 if (!e) {
1173 ret = -ENOMEM;
1174 goto err;
1175 }
1176
1177 e->event.base.type = DRM_EXYNOS_G2D_EVENT;
1178 e->event.base.length = sizeof(e->event);
1179 e->event.user_data = req->user_data;
1180
1181 ret = drm_event_reserve_init(drm_dev, file, &e->base, &e->event.base);
1182 if (ret) {
1183 kfree(e);
1184 goto err;
1185 }
1186
1187 node->event = e;
1188 }
1189
1190 cmdlist = node->cmdlist;
1191
1192 cmdlist->last = 0;
1193
1194 /*
1195 * If don't clear SFR registers, the cmdlist is affected by register
1196 * values of previous cmdlist. G2D hw executes SFR clear command and
1197 * a next command at the same time then the next command is ignored and
1198 * is executed rightly from next next command, so needs a dummy command
1199 * to next command of SFR clear command.
1200 */
1201 cmdlist->data[cmdlist->last++] = G2D_SOFT_RESET;
1202 cmdlist->data[cmdlist->last++] = G2D_SFRCLEAR;
1203 cmdlist->data[cmdlist->last++] = G2D_SRC_BASE_ADDR;
1204 cmdlist->data[cmdlist->last++] = 0;
1205
1206 /*
1207 * 'LIST_HOLD' command should be set to the DMA_HOLD_CMD_REG
1208 * and GCF bit should be set to INTEN register if user wants
1209 * G2D interrupt event once current command list execution is
1210 * finished.
1211 * Otherwise only ACF bit should be set to INTEN register so
1212 * that one interrupt is occurred after all command lists
1213 * have been completed.
1214 */
1215 if (node->event) {
1216 cmdlist->data[cmdlist->last++] = G2D_INTEN;
1217 cmdlist->data[cmdlist->last++] = G2D_INTEN_ACF | G2D_INTEN_GCF;
1218 cmdlist->data[cmdlist->last++] = G2D_DMA_HOLD_CMD;
1219 cmdlist->data[cmdlist->last++] = G2D_LIST_HOLD;
1220 } else {
1221 cmdlist->data[cmdlist->last++] = G2D_INTEN;
1222 cmdlist->data[cmdlist->last++] = G2D_INTEN_ACF;
1223 }
1224
1225 /*
1226 * Check the size of cmdlist. The 2 that is added last comes from
1227 * the implicit G2D_BITBLT_START that is appended once we have
1228 * checked all the submitted commands.
1229 */
1230 size = cmdlist->last + req->cmd_nr * 2 + req->cmd_buf_nr * 2 + 2;
1231 if (size > G2D_CMDLIST_DATA_NUM) {
1232 dev_err(g2d->dev, "cmdlist size is too big\n");
1233 ret = -EINVAL;
1234 goto err_free_event;
1235 }
1236
1237 cmd = (struct drm_exynos_g2d_cmd *)(unsigned long)req->cmd;
1238
1239 if (copy_from_user(cmdlist->data + cmdlist->last,
1240 (void __user *)cmd,
1241 sizeof(*cmd) * req->cmd_nr)) {
1242 ret = -EFAULT;
1243 goto err_free_event;
1244 }
1245 cmdlist->last += req->cmd_nr * 2;
1246
1247 ret = g2d_check_reg_offset(g2d, node, req->cmd_nr, false);
1248 if (ret < 0)
1249 goto err_free_event;
1250
1251 node->buf_info.map_nr = req->cmd_buf_nr;
1252 if (req->cmd_buf_nr) {
1253 struct drm_exynos_g2d_cmd *cmd_buf;
1254
1255 cmd_buf = (struct drm_exynos_g2d_cmd *)
1256 (unsigned long)req->cmd_buf;
1257
1258 if (copy_from_user(cmdlist->data + cmdlist->last,
1259 (void __user *)cmd_buf,
1260 sizeof(*cmd_buf) * req->cmd_buf_nr)) {
1261 ret = -EFAULT;
1262 goto err_free_event;
1263 }
1264 cmdlist->last += req->cmd_buf_nr * 2;
1265
1266 ret = g2d_check_reg_offset(g2d, node, req->cmd_buf_nr, true);
1267 if (ret < 0)
1268 goto err_free_event;
1269
1270 ret = g2d_map_cmdlist_gem(g2d, node, drm_dev, file);
1271 if (ret < 0)
1272 goto err_unmap;
1273 }
1274
1275 cmdlist->data[cmdlist->last++] = G2D_BITBLT_START;
1276 cmdlist->data[cmdlist->last++] = G2D_START_BITBLT;
1277
1278 /* head */
1279 cmdlist->head = cmdlist->last / 2;
1280
1281 /* tail */
1282 cmdlist->data[cmdlist->last] = 0;
1283
1284 g2d_add_cmdlist_to_inuse(file_priv, node);
1285
1286 return 0;
1287
1288 err_unmap:
1289 g2d_unmap_cmdlist_gem(g2d, node, file);
1290 err_free_event:
1291 if (node->event)
1292 drm_event_cancel_free(drm_dev, &node->event->base);
1293 err:
1294 g2d_put_cmdlist(g2d, node);
1295 return ret;
1296 }
1297
exynos_g2d_exec_ioctl(struct drm_device * drm_dev,void * data,struct drm_file * file)1298 int exynos_g2d_exec_ioctl(struct drm_device *drm_dev, void *data,
1299 struct drm_file *file)
1300 {
1301 struct drm_exynos_file_private *file_priv = file->driver_priv;
1302 struct exynos_drm_private *priv = drm_dev->dev_private;
1303 struct g2d_data *g2d = dev_get_drvdata(priv->g2d_dev);
1304 struct drm_exynos_g2d_exec *req = data;
1305 struct g2d_runqueue_node *runqueue_node;
1306 struct list_head *run_cmdlist;
1307 struct list_head *event_list;
1308
1309 runqueue_node = kmem_cache_alloc(g2d->runqueue_slab, GFP_KERNEL);
1310 if (!runqueue_node)
1311 return -ENOMEM;
1312
1313 run_cmdlist = &runqueue_node->run_cmdlist;
1314 event_list = &runqueue_node->event_list;
1315 INIT_LIST_HEAD(run_cmdlist);
1316 INIT_LIST_HEAD(event_list);
1317 init_completion(&runqueue_node->complete);
1318 runqueue_node->async = req->async;
1319
1320 list_splice_init(&file_priv->inuse_cmdlist, run_cmdlist);
1321 list_splice_init(&file_priv->event_list, event_list);
1322
1323 if (list_empty(run_cmdlist)) {
1324 dev_err(g2d->dev, "there is no inuse cmdlist\n");
1325 kmem_cache_free(g2d->runqueue_slab, runqueue_node);
1326 return -EPERM;
1327 }
1328
1329 mutex_lock(&g2d->runqueue_mutex);
1330 runqueue_node->pid = current->pid;
1331 runqueue_node->filp = file;
1332 list_add_tail(&runqueue_node->list, &g2d->runqueue);
1333 mutex_unlock(&g2d->runqueue_mutex);
1334
1335 /* Let the runqueue know that there is work to do. */
1336 queue_work(g2d->g2d_workq, &g2d->runqueue_work);
1337
1338 if (req->async)
1339 goto out;
1340
1341 wait_for_completion(&runqueue_node->complete);
1342 g2d_free_runqueue_node(g2d, runqueue_node);
1343
1344 out:
1345 return 0;
1346 }
1347
g2d_open(struct drm_device * drm_dev,struct drm_file * file)1348 int g2d_open(struct drm_device *drm_dev, struct drm_file *file)
1349 {
1350 struct drm_exynos_file_private *file_priv = file->driver_priv;
1351
1352 INIT_LIST_HEAD(&file_priv->inuse_cmdlist);
1353 INIT_LIST_HEAD(&file_priv->event_list);
1354 INIT_LIST_HEAD(&file_priv->userptr_list);
1355
1356 return 0;
1357 }
1358
g2d_close(struct drm_device * drm_dev,struct drm_file * file)1359 void g2d_close(struct drm_device *drm_dev, struct drm_file *file)
1360 {
1361 struct drm_exynos_file_private *file_priv = file->driver_priv;
1362 struct exynos_drm_private *priv = drm_dev->dev_private;
1363 struct g2d_data *g2d;
1364 struct g2d_cmdlist_node *node, *n;
1365
1366 if (!priv->g2d_dev)
1367 return;
1368
1369 g2d = dev_get_drvdata(priv->g2d_dev);
1370
1371 /* Remove the runqueue nodes that belong to us. */
1372 mutex_lock(&g2d->runqueue_mutex);
1373 g2d_remove_runqueue_nodes(g2d, file);
1374 mutex_unlock(&g2d->runqueue_mutex);
1375
1376 /*
1377 * Wait for the runqueue worker to finish its current node.
1378 * After this the engine should no longer be accessing any
1379 * memory belonging to us.
1380 */
1381 g2d_wait_finish(g2d, file);
1382
1383 /*
1384 * Even after the engine is idle, there might still be stale cmdlists
1385 * (i.e. cmdlisst which we submitted but never executed) around, with
1386 * their corresponding GEM/userptr buffers.
1387 * Properly unmap these buffers here.
1388 */
1389 mutex_lock(&g2d->cmdlist_mutex);
1390 list_for_each_entry_safe(node, n, &file_priv->inuse_cmdlist, list) {
1391 g2d_unmap_cmdlist_gem(g2d, node, file);
1392 list_move_tail(&node->list, &g2d->free_cmdlist);
1393 }
1394 mutex_unlock(&g2d->cmdlist_mutex);
1395
1396 /* release all g2d_userptr in pool. */
1397 g2d_userptr_free_all(g2d, file);
1398 }
1399
g2d_bind(struct device * dev,struct device * master,void * data)1400 static int g2d_bind(struct device *dev, struct device *master, void *data)
1401 {
1402 struct g2d_data *g2d = dev_get_drvdata(dev);
1403 struct drm_device *drm_dev = data;
1404 struct exynos_drm_private *priv = drm_dev->dev_private;
1405 int ret;
1406
1407 g2d->drm_dev = drm_dev;
1408
1409 /* allocate dma-aware cmdlist buffer. */
1410 ret = g2d_init_cmdlist(g2d);
1411 if (ret < 0) {
1412 dev_err(dev, "cmdlist init failed\n");
1413 return ret;
1414 }
1415
1416 ret = exynos_drm_register_dma(drm_dev, dev, &g2d->dma_priv);
1417 if (ret < 0) {
1418 dev_err(dev, "failed to enable iommu.\n");
1419 g2d_fini_cmdlist(g2d);
1420 return ret;
1421 }
1422 priv->g2d_dev = dev;
1423
1424 dev_info(dev, "The Exynos G2D (ver %d.%d) successfully registered.\n",
1425 G2D_HW_MAJOR_VER, G2D_HW_MINOR_VER);
1426 return 0;
1427 }
1428
g2d_unbind(struct device * dev,struct device * master,void * data)1429 static void g2d_unbind(struct device *dev, struct device *master, void *data)
1430 {
1431 struct g2d_data *g2d = dev_get_drvdata(dev);
1432 struct drm_device *drm_dev = data;
1433 struct exynos_drm_private *priv = drm_dev->dev_private;
1434
1435 /* Suspend operation and wait for engine idle. */
1436 set_bit(G2D_BIT_SUSPEND_RUNQUEUE, &g2d->flags);
1437 g2d_wait_finish(g2d, NULL);
1438 priv->g2d_dev = NULL;
1439
1440 cancel_work_sync(&g2d->runqueue_work);
1441 exynos_drm_unregister_dma(g2d->drm_dev, dev, &g2d->dma_priv);
1442 }
1443
1444 static const struct component_ops g2d_component_ops = {
1445 .bind = g2d_bind,
1446 .unbind = g2d_unbind,
1447 };
1448
g2d_probe(struct platform_device * pdev)1449 static int g2d_probe(struct platform_device *pdev)
1450 {
1451 struct device *dev = &pdev->dev;
1452 struct g2d_data *g2d;
1453 int ret;
1454
1455 g2d = devm_kzalloc(dev, sizeof(*g2d), GFP_KERNEL);
1456 if (!g2d)
1457 return -ENOMEM;
1458
1459 g2d->runqueue_slab = kmem_cache_create("g2d_runqueue_slab",
1460 sizeof(struct g2d_runqueue_node), 0, 0, NULL);
1461 if (!g2d->runqueue_slab)
1462 return -ENOMEM;
1463
1464 g2d->dev = dev;
1465
1466 g2d->g2d_workq = create_singlethread_workqueue("g2d");
1467 if (!g2d->g2d_workq) {
1468 dev_err(dev, "failed to create workqueue\n");
1469 ret = -EINVAL;
1470 goto err_destroy_slab;
1471 }
1472
1473 INIT_WORK(&g2d->runqueue_work, g2d_runqueue_worker);
1474 INIT_LIST_HEAD(&g2d->free_cmdlist);
1475 INIT_LIST_HEAD(&g2d->runqueue);
1476
1477 mutex_init(&g2d->cmdlist_mutex);
1478 mutex_init(&g2d->runqueue_mutex);
1479
1480 g2d->gate_clk = devm_clk_get(dev, "fimg2d");
1481 if (IS_ERR(g2d->gate_clk)) {
1482 dev_err(dev, "failed to get gate clock\n");
1483 ret = PTR_ERR(g2d->gate_clk);
1484 goto err_destroy_workqueue;
1485 }
1486
1487 pm_runtime_use_autosuspend(dev);
1488 pm_runtime_set_autosuspend_delay(dev, 2000);
1489 pm_runtime_enable(dev);
1490 clear_bit(G2D_BIT_SUSPEND_RUNQUEUE, &g2d->flags);
1491 clear_bit(G2D_BIT_ENGINE_BUSY, &g2d->flags);
1492
1493 g2d->regs = devm_platform_ioremap_resource(pdev, 0);
1494 if (IS_ERR(g2d->regs)) {
1495 ret = PTR_ERR(g2d->regs);
1496 goto err_put_clk;
1497 }
1498
1499 g2d->irq = platform_get_irq(pdev, 0);
1500 if (g2d->irq < 0) {
1501 ret = g2d->irq;
1502 goto err_put_clk;
1503 }
1504
1505 ret = devm_request_irq(dev, g2d->irq, g2d_irq_handler, 0,
1506 "drm_g2d", g2d);
1507 if (ret < 0) {
1508 dev_err(dev, "irq request failed\n");
1509 goto err_put_clk;
1510 }
1511
1512 g2d->max_pool = MAX_POOL;
1513
1514 platform_set_drvdata(pdev, g2d);
1515
1516 ret = component_add(dev, &g2d_component_ops);
1517 if (ret < 0) {
1518 dev_err(dev, "failed to register drm g2d device\n");
1519 goto err_put_clk;
1520 }
1521
1522 return 0;
1523
1524 err_put_clk:
1525 pm_runtime_disable(dev);
1526 err_destroy_workqueue:
1527 destroy_workqueue(g2d->g2d_workq);
1528 err_destroy_slab:
1529 kmem_cache_destroy(g2d->runqueue_slab);
1530 return ret;
1531 }
1532
g2d_remove(struct platform_device * pdev)1533 static void g2d_remove(struct platform_device *pdev)
1534 {
1535 struct g2d_data *g2d = platform_get_drvdata(pdev);
1536
1537 component_del(&pdev->dev, &g2d_component_ops);
1538
1539 /* There should be no locking needed here. */
1540 g2d_remove_runqueue_nodes(g2d, NULL);
1541
1542 pm_runtime_dont_use_autosuspend(&pdev->dev);
1543 pm_runtime_disable(&pdev->dev);
1544
1545 g2d_fini_cmdlist(g2d);
1546 destroy_workqueue(g2d->g2d_workq);
1547 kmem_cache_destroy(g2d->runqueue_slab);
1548 }
1549
g2d_suspend(struct device * dev)1550 static int g2d_suspend(struct device *dev)
1551 {
1552 struct g2d_data *g2d = dev_get_drvdata(dev);
1553
1554 /*
1555 * Suspend the runqueue worker operation and wait until the G2D
1556 * engine is idle.
1557 */
1558 set_bit(G2D_BIT_SUSPEND_RUNQUEUE, &g2d->flags);
1559 g2d_wait_finish(g2d, NULL);
1560 flush_work(&g2d->runqueue_work);
1561
1562 return 0;
1563 }
1564
g2d_resume(struct device * dev)1565 static int g2d_resume(struct device *dev)
1566 {
1567 struct g2d_data *g2d = dev_get_drvdata(dev);
1568
1569 clear_bit(G2D_BIT_SUSPEND_RUNQUEUE, &g2d->flags);
1570 queue_work(g2d->g2d_workq, &g2d->runqueue_work);
1571
1572 return 0;
1573 }
1574
g2d_runtime_suspend(struct device * dev)1575 static int g2d_runtime_suspend(struct device *dev)
1576 {
1577 struct g2d_data *g2d = dev_get_drvdata(dev);
1578
1579 clk_disable_unprepare(g2d->gate_clk);
1580
1581 return 0;
1582 }
1583
g2d_runtime_resume(struct device * dev)1584 static int g2d_runtime_resume(struct device *dev)
1585 {
1586 struct g2d_data *g2d = dev_get_drvdata(dev);
1587 int ret;
1588
1589 ret = clk_prepare_enable(g2d->gate_clk);
1590 if (ret < 0)
1591 dev_warn(dev, "failed to enable clock.\n");
1592
1593 return ret;
1594 }
1595
1596 static const struct dev_pm_ops g2d_pm_ops = {
1597 SYSTEM_SLEEP_PM_OPS(g2d_suspend, g2d_resume)
1598 RUNTIME_PM_OPS(g2d_runtime_suspend, g2d_runtime_resume, NULL)
1599 };
1600
1601 static const struct of_device_id exynos_g2d_match[] = {
1602 { .compatible = "samsung,exynos5250-g2d" },
1603 { .compatible = "samsung,exynos4212-g2d" },
1604 {},
1605 };
1606 MODULE_DEVICE_TABLE(of, exynos_g2d_match);
1607
1608 struct platform_driver g2d_driver = {
1609 .probe = g2d_probe,
1610 .remove_new = g2d_remove,
1611 .driver = {
1612 .name = "exynos-drm-g2d",
1613 .owner = THIS_MODULE,
1614 .pm = pm_ptr(&g2d_pm_ops),
1615 .of_match_table = exynos_g2d_match,
1616 },
1617 };
1618