drivers/gpu/drm/exynos/exynos_drm_g2d.c

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