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 
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 
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 
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 
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 
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 
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 
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 
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_FORCE | 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 
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 
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 
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 
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 
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 
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 
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 
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 
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  */
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 
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 
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 
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  */
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 
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 */
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 
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 
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 (runqueue_node->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 
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 
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 
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 
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 
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 
1533 static int 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 	return 0;
1550 }
1551 
1552 #ifdef CONFIG_PM_SLEEP
1553 static int g2d_suspend(struct device *dev)
1554 {
1555 	struct g2d_data *g2d = dev_get_drvdata(dev);
1556 
1557 	/*
1558 	 * Suspend the runqueue worker operation and wait until the G2D
1559 	 * engine is idle.
1560 	 */
1561 	set_bit(G2D_BIT_SUSPEND_RUNQUEUE, &g2d->flags);
1562 	g2d_wait_finish(g2d, NULL);
1563 	flush_work(&g2d->runqueue_work);
1564 
1565 	return 0;
1566 }
1567 
1568 static int g2d_resume(struct device *dev)
1569 {
1570 	struct g2d_data *g2d = dev_get_drvdata(dev);
1571 
1572 	clear_bit(G2D_BIT_SUSPEND_RUNQUEUE, &g2d->flags);
1573 	queue_work(g2d->g2d_workq, &g2d->runqueue_work);
1574 
1575 	return 0;
1576 }
1577 #endif
1578 
1579 #ifdef CONFIG_PM
1580 static int g2d_runtime_suspend(struct device *dev)
1581 {
1582 	struct g2d_data *g2d = dev_get_drvdata(dev);
1583 
1584 	clk_disable_unprepare(g2d->gate_clk);
1585 
1586 	return 0;
1587 }
1588 
1589 static int g2d_runtime_resume(struct device *dev)
1590 {
1591 	struct g2d_data *g2d = dev_get_drvdata(dev);
1592 	int ret;
1593 
1594 	ret = clk_prepare_enable(g2d->gate_clk);
1595 	if (ret < 0)
1596 		dev_warn(dev, "failed to enable clock.\n");
1597 
1598 	return ret;
1599 }
1600 #endif
1601 
1602 static const struct dev_pm_ops g2d_pm_ops = {
1603 	SET_SYSTEM_SLEEP_PM_OPS(g2d_suspend, g2d_resume)
1604 	SET_RUNTIME_PM_OPS(g2d_runtime_suspend, g2d_runtime_resume, NULL)
1605 };
1606 
1607 static const struct of_device_id exynos_g2d_match[] = {
1608 	{ .compatible = "samsung,exynos5250-g2d" },
1609 	{ .compatible = "samsung,exynos4212-g2d" },
1610 	{},
1611 };
1612 MODULE_DEVICE_TABLE(of, exynos_g2d_match);
1613 
1614 struct platform_driver g2d_driver = {
1615 	.probe		= g2d_probe,
1616 	.remove		= g2d_remove,
1617 	.driver		= {
1618 		.name	= "exynos-drm-g2d",
1619 		.owner	= THIS_MODULE,
1620 		.pm	= &g2d_pm_ops,
1621 		.of_match_table = exynos_g2d_match,
1622 	},
1623 };
1624