drivers/gpu/drm/exynos/exynos_drm_g2d.c

   1 /*
   2  * Copyright (C) 2012 Samsung Electronics Co.Ltd
   3  * Authors: Joonyoung Shim <[email protected]>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License version 2 as
   7  * published by the Free Software Foundationr
   8  */
   9
  10 #include <linux/kernel.h>
  11 #include <linux/clk.h>
  12 #include <linux/err.h>
  13 #include <linux/interrupt.h>
  14 #include <linux/io.h>
  15 #include <linux/platform_device.h>
  16 #include <linux/pm_runtime.h>
  17 #include <linux/slab.h>
  18 #include <linux/workqueue.h>
  19 #include <linux/dma-mapping.h>
  20 #include <linux/of.h>
  21
  22 #include <drm/drmP.h>
  23 #include <drm/exynos_drm.h>
  24 #include "exynos_drm_drv.h"
  25 #include "exynos_drm_g2d.h"
  26 #include "exynos_drm_gem.h"
  27 #include "exynos_drm_iommu.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         unsigned long           handles[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 frame_vector     *vec;
 209         struct sg_table         *sgt;
 210         atomic_t                refcount;
 211         bool                    in_pool;
 212         bool                    out_of_list;
 213 };
 214 struct g2d_cmdlist_node {
 215         struct list_head        list;
 216         struct g2d_cmdlist      *cmdlist;
 217         dma_addr_t              dma_addr;
 218         struct g2d_buf_info     buf_info;
 219
 220         struct drm_exynos_pending_g2d_event     *event;
 221 };
 222
 223 struct g2d_runqueue_node {
 224         struct list_head        list;
 225         struct list_head        run_cmdlist;
 226         struct list_head        event_list;
 227         struct drm_file         *filp;
 228         pid_t                   pid;
 229         struct completion       complete;
 230         int                     async;
 231 };
 232
 233 struct g2d_data {
 234         struct device                   *dev;
 235         struct clk                      *gate_clk;
 236         void __iomem                    *regs;
 237         int                             irq;
 238         struct workqueue_struct         *g2d_workq;
 239         struct work_struct              runqueue_work;
 240         struct exynos_drm_subdrv        subdrv;
 241         unsigned long                   flags;
 242
 243         /* cmdlist */
 244         struct g2d_cmdlist_node         *cmdlist_node;
 245         struct list_head                free_cmdlist;
 246         struct mutex                    cmdlist_mutex;
 247         dma_addr_t                      cmdlist_pool;
 248         void                            *cmdlist_pool_virt;
 249         unsigned long                   cmdlist_dma_attrs;
 250
 251         /* runqueue*/
 252         struct g2d_runqueue_node        *runqueue_node;
 253         struct list_head                runqueue;
 254         struct mutex                    runqueue_mutex;
 255         struct kmem_cache               *runqueue_slab;
 256
 257         unsigned long                   current_pool;
 258         unsigned long                   max_pool;
 259 };
 260
 261 static inline void g2d_hw_reset(struct g2d_data *g2d)
 262 {
 263         writel(G2D_R | G2D_SFRCLEAR, g2d->regs + G2D_SOFT_RESET);
 264         clear_bit(G2D_BIT_ENGINE_BUSY, &g2d->flags);
 265 }
 266
 267 static int g2d_init_cmdlist(struct g2d_data *g2d)
 268 {
 269         struct device *dev = g2d->dev;
 270         struct g2d_cmdlist_node *node = g2d->cmdlist_node;
 271         struct exynos_drm_subdrv *subdrv = &g2d->subdrv;
 272         int nr;
 273         int ret;
 274         struct g2d_buf_info *buf_info;
 275
 276         g2d->cmdlist_dma_attrs = DMA_ATTR_WRITE_COMBINE;
 277
 278         g2d->cmdlist_pool_virt = dma_alloc_attrs(to_dma_dev(subdrv->drm_dev),
 279                                                 G2D_CMDLIST_POOL_SIZE,
 280                                                 &g2d->cmdlist_pool, GFP_KERNEL,
 281                                                 g2d->cmdlist_dma_attrs);
 282         if (!g2d->cmdlist_pool_virt) {
 283                 dev_err(dev, "failed to allocate dma memory\n");
 284                 return -ENOMEM;
 285         }
 286
 287         node = kcalloc(G2D_CMDLIST_NUM, sizeof(*node), GFP_KERNEL);
 288         if (!node) {
 289                 ret = -ENOMEM;
 290                 goto err;
 291         }
 292
 293         for (nr = 0; nr < G2D_CMDLIST_NUM; nr++) {
 294                 unsigned int i;
 295
 296                 node[nr].cmdlist =
 297                         g2d->cmdlist_pool_virt + nr * G2D_CMDLIST_SIZE;
 298                 node[nr].dma_addr =
 299                         g2d->cmdlist_pool + nr * G2D_CMDLIST_SIZE;
 300
 301                 buf_info = &node[nr].buf_info;
 302                 for (i = 0; i < MAX_REG_TYPE_NR; i++)
 303                         buf_info->reg_types[i] = REG_TYPE_NONE;
 304
 305                 list_add_tail(&node[nr].list, &g2d->free_cmdlist);
 306         }
 307
 308         return 0;
 309
 310 err:
 311         dma_free_attrs(to_dma_dev(subdrv->drm_dev), G2D_CMDLIST_POOL_SIZE,
 312                         g2d->cmdlist_pool_virt,
 313                         g2d->cmdlist_pool, g2d->cmdlist_dma_attrs);
 314         return ret;
 315 }
 316
 317 static void g2d_fini_cmdlist(struct g2d_data *g2d)
 318 {
 319         struct exynos_drm_subdrv *subdrv = &g2d->subdrv;
 320
 321         kfree(g2d->cmdlist_node);
 322
 323         if (g2d->cmdlist_pool_virt && g2d->cmdlist_pool) {
 324                 dma_free_attrs(to_dma_dev(subdrv->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 exynos_drm_g2d_private *g2d_priv,
 359                                      struct g2d_cmdlist_node *node)
 360 {
 361         struct g2d_cmdlist_node *lnode;
 362
 363         if (list_empty(&g2d_priv->inuse_cmdlist))
 364                 goto add_to_list;
 365
 366         /* this links to base address of new cmdlist */
 367         lnode = list_entry(g2d_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, &g2d_priv->inuse_cmdlist);
 373
 374         if (node->event)
 375                 list_add_tail(&node->event->base.link, &g2d_priv->event_list);
 376 }
 377
 378 static void g2d_userptr_put_dma_addr(struct drm_device *drm_dev,
 379                                         unsigned long obj,
 380                                         bool force)
 381 {
 382         struct g2d_cmdlist_userptr *g2d_userptr =
 383                                         (struct g2d_cmdlist_userptr *)obj;
 384         struct page **pages;
 385
 386         if (!obj)
 387                 return;
 388
 389         if (force)
 390                 goto out;
 391
 392         atomic_dec(&g2d_userptr->refcount);
 393
 394         if (atomic_read(&g2d_userptr->refcount) > 0)
 395                 return;
 396
 397         if (g2d_userptr->in_pool)
 398                 return;
 399
 400 out:
 401         dma_unmap_sg(to_dma_dev(drm_dev), g2d_userptr->sgt->sgl,
 402                         g2d_userptr->sgt->nents, DMA_BIDIRECTIONAL);
 403
 404         pages = frame_vector_pages(g2d_userptr->vec);
 405         if (!IS_ERR(pages)) {
 406                 int i;
 407
 408                 for (i = 0; i < frame_vector_count(g2d_userptr->vec); i++)
 409                         set_page_dirty_lock(pages[i]);
 410         }
 411         put_vaddr_frames(g2d_userptr->vec);
 412         frame_vector_destroy(g2d_userptr->vec);
 413
 414         if (!g2d_userptr->out_of_list)
 415                 list_del_init(&g2d_userptr->list);
 416
 417         sg_free_table(g2d_userptr->sgt);
 418         kfree(g2d_userptr->sgt);
 419         kfree(g2d_userptr);
 420 }
 421
 422 static dma_addr_t *g2d_userptr_get_dma_addr(struct drm_device *drm_dev,
 423                                         unsigned long userptr,
 424                                         unsigned long size,
 425                                         struct drm_file *filp,
 426                                         unsigned long *obj)
 427 {
 428         struct drm_exynos_file_private *file_priv = filp->driver_priv;
 429         struct exynos_drm_g2d_private *g2d_priv = file_priv->g2d_priv;
 430         struct g2d_cmdlist_userptr *g2d_userptr;
 431         struct g2d_data *g2d;
 432         struct sg_table *sgt;
 433         unsigned long start, end;
 434         unsigned int npages, offset;
 435         int ret;
 436
 437         if (!size) {
 438                 DRM_ERROR("invalid userptr size.\n");
 439                 return ERR_PTR(-EINVAL);
 440         }
 441
 442         g2d = dev_get_drvdata(g2d_priv->dev);
 443
 444         /* check if userptr already exists in userptr_list. */
 445         list_for_each_entry(g2d_userptr, &g2d_priv->userptr_list, list) {
 446                 if (g2d_userptr->userptr == userptr) {
 447                         /*
 448                          * also check size because there could be same address
 449                          * and different size.
 450                          */
 451                         if (g2d_userptr->size == size) {
 452                                 atomic_inc(&g2d_userptr->refcount);
 453                                 *obj = (unsigned long)g2d_userptr;
 454
 455                                 return &g2d_userptr->dma_addr;
 456                         }
 457
 458                         /*
 459                          * at this moment, maybe g2d dma is accessing this
 460                          * g2d_userptr memory region so just remove this
 461                          * g2d_userptr object from userptr_list not to be
 462                          * referred again and also except it the userptr
 463                          * pool to be released after the dma access completion.
 464                          */
 465                         g2d_userptr->out_of_list = true;
 466                         g2d_userptr->in_pool = false;
 467                         list_del_init(&g2d_userptr->list);
 468
 469                         break;
 470                 }
 471         }
 472
 473         g2d_userptr = kzalloc(sizeof(*g2d_userptr), GFP_KERNEL);
 474         if (!g2d_userptr)
 475                 return ERR_PTR(-ENOMEM);
 476
 477         atomic_set(&g2d_userptr->refcount, 1);
 478         g2d_userptr->size = size;
 479
 480         start = userptr & PAGE_MASK;
 481         offset = userptr & ~PAGE_MASK;
 482         end = PAGE_ALIGN(userptr + size);
 483         npages = (end - start) >> PAGE_SHIFT;
 484         g2d_userptr->vec = frame_vector_create(npages);
 485         if (!g2d_userptr->vec) {
 486                 ret = -ENOMEM;
 487                 goto err_free;
 488         }
 489
 490         ret = get_vaddr_frames(start, npages, FOLL_FORCE | FOLL_WRITE,
 491                 g2d_userptr->vec);
 492         if (ret != npages) {
 493                 DRM_ERROR("failed to get user pages from userptr.\n");
 494                 if (ret < 0)
 495                         goto err_destroy_framevec;
 496                 ret = -EFAULT;
 497                 goto err_put_framevec;
 498         }
 499         if (frame_vector_to_pages(g2d_userptr->vec) < 0) {
 500                 ret = -EFAULT;
 501                 goto err_put_framevec;
 502         }
 503
 504         sgt = kzalloc(sizeof(*sgt), GFP_KERNEL);
 505         if (!sgt) {
 506                 ret = -ENOMEM;
 507                 goto err_put_framevec;
 508         }
 509
 510         ret = sg_alloc_table_from_pages(sgt,
 511                                         frame_vector_pages(g2d_userptr->vec),
 512                                         npages, offset, size, GFP_KERNEL);
 513         if (ret < 0) {
 514                 DRM_ERROR("failed to get sgt from pages.\n");
 515                 goto err_free_sgt;
 516         }
 517
 518         g2d_userptr->sgt = sgt;
 519
 520         if (!dma_map_sg(to_dma_dev(drm_dev), sgt->sgl, sgt->nents,
 521                                 DMA_BIDIRECTIONAL)) {
 522                 DRM_ERROR("failed to map sgt with dma region.\n");
 523                 ret = -ENOMEM;
 524                 goto err_sg_free_table;
 525         }
 526
 527         g2d_userptr->dma_addr = sgt->sgl[0].dma_address;
 528         g2d_userptr->userptr = userptr;
 529
 530         list_add_tail(&g2d_userptr->list, &g2d_priv->userptr_list);
 531
 532         if (g2d->current_pool + (npages << PAGE_SHIFT) < g2d->max_pool) {
 533                 g2d->current_pool += npages << PAGE_SHIFT;
 534                 g2d_userptr->in_pool = true;
 535         }
 536
 537         *obj = (unsigned long)g2d_userptr;
 538
 539         return &g2d_userptr->dma_addr;
 540
 541 err_sg_free_table:
 542         sg_free_table(sgt);
 543
 544 err_free_sgt:
 545         kfree(sgt);
 546
 547 err_put_framevec:
 548         put_vaddr_frames(g2d_userptr->vec);
 549
 550 err_destroy_framevec:
 551         frame_vector_destroy(g2d_userptr->vec);
 552
 553 err_free:
 554         kfree(g2d_userptr);
 555
 556         return ERR_PTR(ret);
 557 }
 558
 559 static void g2d_userptr_free_all(struct drm_device *drm_dev,
 560                                         struct g2d_data *g2d,
 561                                         struct drm_file *filp)
 562 {
 563         struct drm_exynos_file_private *file_priv = filp->driver_priv;
 564         struct exynos_drm_g2d_private *g2d_priv = file_priv->g2d_priv;
 565         struct g2d_cmdlist_userptr *g2d_userptr, *n;
 566
 567         list_for_each_entry_safe(g2d_userptr, n, &g2d_priv->userptr_list, list)
 568                 if (g2d_userptr->in_pool)
 569                         g2d_userptr_put_dma_addr(drm_dev,
 570                                                 (unsigned long)g2d_userptr,
 571                                                 true);
 572
 573         g2d->current_pool = 0;
 574 }
 575
 576 static enum g2d_reg_type g2d_get_reg_type(int reg_offset)
 577 {
 578         enum g2d_reg_type reg_type;
 579
 580         switch (reg_offset) {
 581         case G2D_SRC_BASE_ADDR:
 582         case G2D_SRC_STRIDE:
 583         case G2D_SRC_COLOR_MODE:
 584         case G2D_SRC_LEFT_TOP:
 585         case G2D_SRC_RIGHT_BOTTOM:
 586                 reg_type = REG_TYPE_SRC;
 587                 break;
 588         case G2D_SRC_PLANE2_BASE_ADDR:
 589                 reg_type = REG_TYPE_SRC_PLANE2;
 590                 break;
 591         case G2D_DST_BASE_ADDR:
 592         case G2D_DST_STRIDE:
 593         case G2D_DST_COLOR_MODE:
 594         case G2D_DST_LEFT_TOP:
 595         case G2D_DST_RIGHT_BOTTOM:
 596                 reg_type = REG_TYPE_DST;
 597                 break;
 598         case G2D_DST_PLANE2_BASE_ADDR:
 599                 reg_type = REG_TYPE_DST_PLANE2;
 600                 break;
 601         case G2D_PAT_BASE_ADDR:
 602                 reg_type = REG_TYPE_PAT;
 603                 break;
 604         case G2D_MSK_BASE_ADDR:
 605                 reg_type = REG_TYPE_MSK;
 606                 break;
 607         default:
 608                 reg_type = REG_TYPE_NONE;
 609                 DRM_ERROR("Unknown register offset![%d]\n", reg_offset);
 610                 break;
 611         }
 612
 613         return reg_type;
 614 }
 615
 616 static unsigned long g2d_get_buf_bpp(unsigned int format)
 617 {
 618         unsigned long bpp;
 619
 620         switch (format) {
 621         case G2D_FMT_XRGB8888:
 622         case G2D_FMT_ARGB8888:
 623                 bpp = 4;
 624                 break;
 625         case G2D_FMT_RGB565:
 626         case G2D_FMT_XRGB1555:
 627         case G2D_FMT_ARGB1555:
 628         case G2D_FMT_XRGB4444:
 629         case G2D_FMT_ARGB4444:
 630                 bpp = 2;
 631                 break;
 632         case G2D_FMT_PACKED_RGB888:
 633                 bpp = 3;
 634                 break;
 635         default:
 636                 bpp = 1;
 637                 break;
 638         }
 639
 640         return bpp;
 641 }
 642
 643 static bool g2d_check_buf_desc_is_valid(struct g2d_buf_desc *buf_desc,
 644                                                 enum g2d_reg_type reg_type,
 645                                                 unsigned long size)
 646 {
 647         int width, height;
 648         unsigned long bpp, last_pos;
 649
 650         /*
 651          * check source and destination buffers only.
 652          * so the others are always valid.
 653          */
 654         if (reg_type != REG_TYPE_SRC && reg_type != REG_TYPE_DST)
 655                 return true;
 656
 657         /* This check also makes sure that right_x > left_x. */
 658         width = (int)buf_desc->right_x - (int)buf_desc->left_x;
 659         if (width < G2D_LEN_MIN || width > G2D_LEN_MAX) {
 660                 DRM_ERROR("width[%d] is out of range!\n", width);
 661                 return false;
 662         }
 663
 664         /* This check also makes sure that bottom_y > top_y. */
 665         height = (int)buf_desc->bottom_y - (int)buf_desc->top_y;
 666         if (height < G2D_LEN_MIN || height > G2D_LEN_MAX) {
 667                 DRM_ERROR("height[%d] is out of range!\n", height);
 668                 return false;
 669         }
 670
 671         bpp = g2d_get_buf_bpp(buf_desc->format);
 672
 673         /* Compute the position of the last byte that the engine accesses. */
 674         last_pos = ((unsigned long)buf_desc->bottom_y - 1) *
 675                 (unsigned long)buf_desc->stride +
 676                 (unsigned long)buf_desc->right_x * bpp - 1;
 677
 678         /*
 679          * Since right_x > left_x and bottom_y > top_y we already know
 680          * that the first_pos < last_pos (first_pos being the position
 681          * of the first byte the engine accesses), it just remains to
 682          * check if last_pos is smaller then the buffer size.
 683          */
 684
 685         if (last_pos >= size) {
 686                 DRM_ERROR("last engine access position [%lu] "
 687                         "is out of range [%lu]!\n", last_pos, size);
 688                 return false;
 689         }
 690
 691         return true;
 692 }
 693
 694 static int g2d_map_cmdlist_gem(struct g2d_data *g2d,
 695                                 struct g2d_cmdlist_node *node,
 696                                 struct drm_device *drm_dev,
 697                                 struct drm_file *file)
 698 {
 699         struct g2d_cmdlist *cmdlist = node->cmdlist;
 700         struct g2d_buf_info *buf_info = &node->buf_info;
 701         int offset;
 702         int ret;
 703         int i;
 704
 705         for (i = 0; i < buf_info->map_nr; i++) {
 706                 struct g2d_buf_desc *buf_desc;
 707                 enum g2d_reg_type reg_type;
 708                 int reg_pos;
 709                 unsigned long handle;
 710                 dma_addr_t *addr;
 711
 712                 reg_pos = cmdlist->last - 2 * (i + 1);
 713
 714                 offset = cmdlist->data[reg_pos];
 715                 handle = cmdlist->data[reg_pos + 1];
 716
 717                 reg_type = g2d_get_reg_type(offset);
 718                 if (reg_type == REG_TYPE_NONE) {
 719                         ret = -EFAULT;
 720                         goto err;
 721                 }
 722
 723                 buf_desc = &buf_info->descs[reg_type];
 724
 725                 if (buf_info->types[reg_type] == BUF_TYPE_GEM) {
 726                         unsigned long size;
 727
 728                         size = exynos_drm_gem_get_size(drm_dev, handle, file);
 729                         if (!size) {
 730                                 ret = -EFAULT;
 731                                 goto err;
 732                         }
 733
 734                         if (!g2d_check_buf_desc_is_valid(buf_desc, reg_type,
 735                                                                         size)) {
 736                                 ret = -EFAULT;
 737                                 goto err;
 738                         }
 739
 740                         addr = exynos_drm_gem_get_dma_addr(drm_dev, handle,
 741                                                                 file);
 742                         if (IS_ERR(addr)) {
 743                                 ret = -EFAULT;
 744                                 goto err;
 745                         }
 746                 } else {
 747                         struct drm_exynos_g2d_userptr g2d_userptr;
 748
 749                         if (copy_from_user(&g2d_userptr, (void __user *)handle,
 750                                 sizeof(struct drm_exynos_g2d_userptr))) {
 751                                 ret = -EFAULT;
 752                                 goto err;
 753                         }
 754
 755                         if (!g2d_check_buf_desc_is_valid(buf_desc, reg_type,
 756                                                         g2d_userptr.size)) {
 757                                 ret = -EFAULT;
 758                                 goto err;
 759                         }
 760
 761                         addr = g2d_userptr_get_dma_addr(drm_dev,
 762                                                         g2d_userptr.userptr,
 763                                                         g2d_userptr.size,
 764                                                         file,
 765                                                         &handle);
 766                         if (IS_ERR(addr)) {
 767                                 ret = -EFAULT;
 768                                 goto err;
 769                         }
 770                 }
 771
 772                 cmdlist->data[reg_pos + 1] = *addr;
 773                 buf_info->reg_types[i] = reg_type;
 774                 buf_info->handles[reg_type] = handle;
 775         }
 776
 777         return 0;
 778
 779 err:
 780         buf_info->map_nr = i;
 781         return ret;
 782 }
 783
 784 static void g2d_unmap_cmdlist_gem(struct g2d_data *g2d,
 785                                   struct g2d_cmdlist_node *node,
 786                                   struct drm_file *filp)
 787 {
 788         struct exynos_drm_subdrv *subdrv = &g2d->subdrv;
 789         struct g2d_buf_info *buf_info = &node->buf_info;
 790         int i;
 791
 792         for (i = 0; i < buf_info->map_nr; i++) {
 793                 struct g2d_buf_desc *buf_desc;
 794                 enum g2d_reg_type reg_type;
 795                 unsigned long handle;
 796
 797                 reg_type = buf_info->reg_types[i];
 798
 799                 buf_desc = &buf_info->descs[reg_type];
 800                 handle = buf_info->handles[reg_type];
 801
 802                 if (buf_info->types[reg_type] == BUF_TYPE_GEM)
 803                         exynos_drm_gem_put_dma_addr(subdrv->drm_dev, handle,
 804                                                         filp);
 805                 else
 806                         g2d_userptr_put_dma_addr(subdrv->drm_dev, handle,
 807                                                         false);
 808
 809                 buf_info->reg_types[i] = REG_TYPE_NONE;
 810                 buf_info->handles[reg_type] = 0;
 811                 buf_info->types[reg_type] = 0;
 812                 memset(buf_desc, 0x00, sizeof(*buf_desc));
 813         }
 814
 815         buf_info->map_nr = 0;
 816 }
 817
 818 static void g2d_dma_start(struct g2d_data *g2d,
 819                           struct g2d_runqueue_node *runqueue_node)
 820 {
 821         struct g2d_cmdlist_node *node =
 822                                 list_first_entry(&runqueue_node->run_cmdlist,
 823                                                 struct g2d_cmdlist_node, list);
 824
 825         set_bit(G2D_BIT_ENGINE_BUSY, &g2d->flags);
 826         writel_relaxed(node->dma_addr, g2d->regs + G2D_DMA_SFR_BASE_ADDR);
 827         writel_relaxed(G2D_DMA_START, g2d->regs + G2D_DMA_COMMAND);
 828 }
 829
 830 static struct g2d_runqueue_node *g2d_get_runqueue_node(struct g2d_data *g2d)
 831 {
 832         struct g2d_runqueue_node *runqueue_node;
 833
 834         if (list_empty(&g2d->runqueue))
 835                 return NULL;
 836
 837         runqueue_node = list_first_entry(&g2d->runqueue,
 838                                          struct g2d_runqueue_node, list);
 839         list_del_init(&runqueue_node->list);
 840         return runqueue_node;
 841 }
 842
 843 static void g2d_free_runqueue_node(struct g2d_data *g2d,
 844                                    struct g2d_runqueue_node *runqueue_node)
 845 {
 846         struct g2d_cmdlist_node *node;
 847
 848         mutex_lock(&g2d->cmdlist_mutex);
 849         /*
 850          * commands in run_cmdlist have been completed so unmap all gem
 851          * objects in each command node so that they are unreferenced.
 852          */
 853         list_for_each_entry(node, &runqueue_node->run_cmdlist, list)
 854                 g2d_unmap_cmdlist_gem(g2d, node, runqueue_node->filp);
 855         list_splice_tail_init(&runqueue_node->run_cmdlist, &g2d->free_cmdlist);
 856         mutex_unlock(&g2d->cmdlist_mutex);
 857
 858         kmem_cache_free(g2d->runqueue_slab, runqueue_node);
 859 }
 860
 861 /**
 862  * g2d_remove_runqueue_nodes - remove items from the list of runqueue nodes
 863  * @g2d: G2D state object
 864  * @file: if not zero, only remove items with this DRM file
 865  *
 866  * Has to be called under runqueue lock.
 867  */
 868 static void g2d_remove_runqueue_nodes(struct g2d_data *g2d, struct drm_file* file)
 869 {
 870         struct g2d_runqueue_node *node, *n;
 871
 872         if (list_empty(&g2d->runqueue))
 873                 return;
 874
 875         list_for_each_entry_safe(node, n, &g2d->runqueue, list) {
 876                 if (file && node->filp != file)
 877                         continue;
 878
 879                 list_del_init(&node->list);
 880                 g2d_free_runqueue_node(g2d, node);
 881         }
 882 }
 883
 884 static void g2d_runqueue_worker(struct work_struct *work)
 885 {
 886         struct g2d_data *g2d = container_of(work, struct g2d_data,
 887                                             runqueue_work);
 888         struct g2d_runqueue_node *runqueue_node;
 889
 890         /*
 891          * The engine is busy and the completion of the current node is going
 892          * to poke the runqueue worker, so nothing to do here.
 893          */
 894         if (test_bit(G2D_BIT_ENGINE_BUSY, &g2d->flags))
 895                 return;
 896
 897         mutex_lock(&g2d->runqueue_mutex);
 898
 899         runqueue_node = g2d->runqueue_node;
 900         g2d->runqueue_node = NULL;
 901
 902         if (runqueue_node) {
 903                 pm_runtime_mark_last_busy(g2d->dev);
 904                 pm_runtime_put_autosuspend(g2d->dev);
 905
 906                 complete(&runqueue_node->complete);
 907                 if (runqueue_node->async)
 908                         g2d_free_runqueue_node(g2d, runqueue_node);
 909         }
 910
 911         if (!test_bit(G2D_BIT_SUSPEND_RUNQUEUE, &g2d->flags)) {
 912                 g2d->runqueue_node = g2d_get_runqueue_node(g2d);
 913
 914                 if (g2d->runqueue_node) {
 915                         pm_runtime_get_sync(g2d->dev);
 916                         g2d_dma_start(g2d, g2d->runqueue_node);
 917                 }
 918         }
 919
 920         mutex_unlock(&g2d->runqueue_mutex);
 921 }
 922
 923 static void g2d_finish_event(struct g2d_data *g2d, u32 cmdlist_no)
 924 {
 925         struct drm_device *drm_dev = g2d->subdrv.drm_dev;
 926         struct g2d_runqueue_node *runqueue_node = g2d->runqueue_node;
 927         struct drm_exynos_pending_g2d_event *e;
 928         struct timespec64 now;
 929
 930         if (list_empty(&runqueue_node->event_list))
 931                 return;
 932
 933         e = list_first_entry(&runqueue_node->event_list,
 934                              struct drm_exynos_pending_g2d_event, base.link);
 935
 936         ktime_get_ts64(&now);
 937         e->event.tv_sec = now.tv_sec;
 938         e->event.tv_usec = now.tv_nsec / NSEC_PER_USEC;
 939         e->event.cmdlist_no = cmdlist_no;
 940
 941         drm_send_event(drm_dev, &e->base);
 942 }
 943
 944 static irqreturn_t g2d_irq_handler(int irq, void *dev_id)
 945 {
 946         struct g2d_data *g2d = dev_id;
 947         u32 pending;
 948
 949         pending = readl_relaxed(g2d->regs + G2D_INTC_PEND);
 950         if (pending)
 951                 writel_relaxed(pending, g2d->regs + G2D_INTC_PEND);
 952
 953         if (pending & G2D_INTP_GCMD_FIN) {
 954                 u32 cmdlist_no = readl_relaxed(g2d->regs + G2D_DMA_STATUS);
 955
 956                 cmdlist_no = (cmdlist_no & G2D_DMA_LIST_DONE_COUNT) >>
 957                                                 G2D_DMA_LIST_DONE_COUNT_OFFSET;
 958
 959                 g2d_finish_event(g2d, cmdlist_no);
 960
 961                 writel_relaxed(0, g2d->regs + G2D_DMA_HOLD_CMD);
 962                 if (!(pending & G2D_INTP_ACMD_FIN)) {
 963                         writel_relaxed(G2D_DMA_CONTINUE,
 964                                         g2d->regs + G2D_DMA_COMMAND);
 965                 }
 966         }
 967
 968         if (pending & G2D_INTP_ACMD_FIN) {
 969                 clear_bit(G2D_BIT_ENGINE_BUSY, &g2d->flags);
 970                 queue_work(g2d->g2d_workq, &g2d->runqueue_work);
 971         }
 972
 973         return IRQ_HANDLED;
 974 }
 975
 976 /**
 977  * g2d_wait_finish - wait for the G2D engine to finish the current runqueue node
 978  * @g2d: G2D state object
 979  * @file: if not zero, only wait if the current runqueue node belongs
 980  *        to the DRM file
 981  *
 982  * Should the engine not become idle after a 100ms timeout, a hardware
 983  * reset is issued.
 984  */
 985 static void g2d_wait_finish(struct g2d_data *g2d, struct drm_file *file)
 986 {
 987         struct device *dev = g2d->dev;
 988
 989         struct g2d_runqueue_node *runqueue_node = NULL;
 990         unsigned int tries = 10;
 991
 992         mutex_lock(&g2d->runqueue_mutex);
 993
 994         /* If no node is currently processed, we have nothing to do. */
 995         if (!g2d->runqueue_node)
 996                 goto out;
 997
 998         runqueue_node = g2d->runqueue_node;
 999
1000         /* Check if the currently processed item belongs to us. */
1001         if (file && runqueue_node->filp != file)
1002                 goto out;
1003
1004         mutex_unlock(&g2d->runqueue_mutex);
1005
1006         /* Wait for the G2D engine to finish. */
1007         while (tries-- && (g2d->runqueue_node == runqueue_node))
1008                 mdelay(10);
1009
1010         mutex_lock(&g2d->runqueue_mutex);
1011
1012         if (g2d->runqueue_node != runqueue_node)
1013                 goto out;
1014
1015         dev_err(dev, "wait timed out, resetting engine...\n");
1016         g2d_hw_reset(g2d);
1017
1018         /*
1019          * After the hardware reset of the engine we are going to loose
1020          * the IRQ which triggers the PM runtime put().
1021          * So do this manually here.
1022          */
1023         pm_runtime_mark_last_busy(dev);
1024         pm_runtime_put_autosuspend(dev);
1025
1026         complete(&runqueue_node->complete);
1027         if (runqueue_node->async)
1028                 g2d_free_runqueue_node(g2d, runqueue_node);
1029
1030 out:
1031         mutex_unlock(&g2d->runqueue_mutex);
1032 }
1033
1034 static int g2d_check_reg_offset(struct device *dev,
1035                                 struct g2d_cmdlist_node *node,
1036                                 int nr, bool for_addr)
1037 {
1038         struct g2d_cmdlist *cmdlist = node->cmdlist;
1039         int reg_offset;
1040         int index;
1041         int i;
1042
1043         for (i = 0; i < nr; i++) {
1044                 struct g2d_buf_info *buf_info = &node->buf_info;
1045                 struct g2d_buf_desc *buf_desc;
1046                 enum g2d_reg_type reg_type;
1047                 unsigned long value;
1048
1049                 index = cmdlist->last - 2 * (i + 1);
1050
1051                 reg_offset = cmdlist->data[index] & ~0xfffff000;
1052                 if (reg_offset < G2D_VALID_START || reg_offset > G2D_VALID_END)
1053                         goto err;
1054                 if (reg_offset % 4)
1055                         goto err;
1056
1057                 switch (reg_offset) {
1058                 case G2D_SRC_BASE_ADDR:
1059                 case G2D_SRC_PLANE2_BASE_ADDR:
1060                 case G2D_DST_BASE_ADDR:
1061                 case G2D_DST_PLANE2_BASE_ADDR:
1062                 case G2D_PAT_BASE_ADDR:
1063                 case G2D_MSK_BASE_ADDR:
1064                         if (!for_addr)
1065                                 goto err;
1066
1067                         reg_type = g2d_get_reg_type(reg_offset);
1068
1069                         /* check userptr buffer type. */
1070                         if ((cmdlist->data[index] & ~0x7fffffff) >> 31) {
1071                                 buf_info->types[reg_type] = BUF_TYPE_USERPTR;
1072                                 cmdlist->data[index] &= ~G2D_BUF_USERPTR;
1073                         } else
1074                                 buf_info->types[reg_type] = BUF_TYPE_GEM;
1075                         break;
1076                 case G2D_SRC_STRIDE:
1077                 case G2D_DST_STRIDE:
1078                         if (for_addr)
1079                                 goto err;
1080
1081                         reg_type = g2d_get_reg_type(reg_offset);
1082
1083                         buf_desc = &buf_info->descs[reg_type];
1084                         buf_desc->stride = cmdlist->data[index + 1];
1085                         break;
1086                 case G2D_SRC_COLOR_MODE:
1087                 case G2D_DST_COLOR_MODE:
1088                         if (for_addr)
1089                                 goto err;
1090
1091                         reg_type = g2d_get_reg_type(reg_offset);
1092
1093                         buf_desc = &buf_info->descs[reg_type];
1094                         value = cmdlist->data[index + 1];
1095
1096                         buf_desc->format = value & 0xf;
1097                         break;
1098                 case G2D_SRC_LEFT_TOP:
1099                 case G2D_DST_LEFT_TOP:
1100                         if (for_addr)
1101                                 goto err;
1102
1103                         reg_type = g2d_get_reg_type(reg_offset);
1104
1105                         buf_desc = &buf_info->descs[reg_type];
1106                         value = cmdlist->data[index + 1];
1107
1108                         buf_desc->left_x = value & 0x1fff;
1109                         buf_desc->top_y = (value & 0x1fff0000) >> 16;
1110                         break;
1111                 case G2D_SRC_RIGHT_BOTTOM:
1112                 case G2D_DST_RIGHT_BOTTOM:
1113                         if (for_addr)
1114                                 goto err;
1115
1116                         reg_type = g2d_get_reg_type(reg_offset);
1117
1118                         buf_desc = &buf_info->descs[reg_type];
1119                         value = cmdlist->data[index + 1];
1120
1121                         buf_desc->right_x = value & 0x1fff;
1122                         buf_desc->bottom_y = (value & 0x1fff0000) >> 16;
1123                         break;
1124                 default:
1125                         if (for_addr)
1126                                 goto err;
1127                         break;
1128                 }
1129         }
1130
1131         return 0;
1132
1133 err:
1134         dev_err(dev, "Bad register offset: 0x%lx\n", cmdlist->data[index]);
1135         return -EINVAL;
1136 }
1137
1138 /* ioctl functions */
1139 int exynos_g2d_get_ver_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_g2d_private *g2d_priv = file_priv->g2d_priv;
1144         struct device *dev;
1145         struct g2d_data *g2d;
1146         struct drm_exynos_g2d_get_ver *ver = data;
1147
1148         if (!g2d_priv)
1149                 return -ENODEV;
1150
1151         dev = g2d_priv->dev;
1152         if (!dev)
1153                 return -ENODEV;
1154
1155         g2d = dev_get_drvdata(dev);
1156         if (!g2d)
1157                 return -EFAULT;
1158
1159         ver->major = G2D_HW_MAJOR_VER;
1160         ver->minor = G2D_HW_MINOR_VER;
1161
1162         return 0;
1163 }
1164
1165 int exynos_g2d_set_cmdlist_ioctl(struct drm_device *drm_dev, void *data,
1166                                  struct drm_file *file)
1167 {
1168         struct drm_exynos_file_private *file_priv = file->driver_priv;
1169         struct exynos_drm_g2d_private *g2d_priv = file_priv->g2d_priv;
1170         struct device *dev;
1171         struct g2d_data *g2d;
1172         struct drm_exynos_g2d_set_cmdlist *req = data;
1173         struct drm_exynos_g2d_cmd *cmd;
1174         struct drm_exynos_pending_g2d_event *e;
1175         struct g2d_cmdlist_node *node;
1176         struct g2d_cmdlist *cmdlist;
1177         int size;
1178         int ret;
1179
1180         if (!g2d_priv)
1181                 return -ENODEV;
1182
1183         dev = g2d_priv->dev;
1184         if (!dev)
1185                 return -ENODEV;
1186
1187         g2d = dev_get_drvdata(dev);
1188         if (!g2d)
1189                 return -EFAULT;
1190
1191         node = g2d_get_cmdlist(g2d);
1192         if (!node)
1193                 return -ENOMEM;
1194
1195         /*
1196          * To avoid an integer overflow for the later size computations, we
1197          * enforce a maximum number of submitted commands here. This limit is
1198          * sufficient for all conceivable usage cases of the G2D.
1199          */
1200         if (req->cmd_nr > G2D_CMDLIST_DATA_NUM ||
1201             req->cmd_buf_nr > G2D_CMDLIST_DATA_NUM) {
1202                 dev_err(dev, "number of submitted G2D commands exceeds limit\n");
1203                 return -EINVAL;
1204         }
1205
1206         node->event = NULL;
1207
1208         if (req->event_type != G2D_EVENT_NOT) {
1209                 e = kzalloc(sizeof(*node->event), GFP_KERNEL);
1210                 if (!e) {
1211                         ret = -ENOMEM;
1212                         goto err;
1213                 }
1214
1215                 e->event.base.type = DRM_EXYNOS_G2D_EVENT;
1216                 e->event.base.length = sizeof(e->event);
1217                 e->event.user_data = req->user_data;
1218
1219                 ret = drm_event_reserve_init(drm_dev, file, &e->base, &e->event.base);
1220                 if (ret) {
1221                         kfree(e);
1222                         goto err;
1223                 }
1224
1225                 node->event = e;
1226         }
1227
1228         cmdlist = node->cmdlist;
1229
1230         cmdlist->last = 0;
1231
1232         /*
1233          * If don't clear SFR registers, the cmdlist is affected by register
1234          * values of previous cmdlist. G2D hw executes SFR clear command and
1235          * a next command at the same time then the next command is ignored and
1236          * is executed rightly from next next command, so needs a dummy command
1237          * to next command of SFR clear command.
1238          */
1239         cmdlist->data[cmdlist->last++] = G2D_SOFT_RESET;
1240         cmdlist->data[cmdlist->last++] = G2D_SFRCLEAR;
1241         cmdlist->data[cmdlist->last++] = G2D_SRC_BASE_ADDR;
1242         cmdlist->data[cmdlist->last++] = 0;
1243
1244         /*
1245          * 'LIST_HOLD' command should be set to the DMA_HOLD_CMD_REG
1246          * and GCF bit should be set to INTEN register if user wants
1247          * G2D interrupt event once current command list execution is
1248          * finished.
1249          * Otherwise only ACF bit should be set to INTEN register so
1250          * that one interrupt is occurred after all command lists
1251          * have been completed.
1252          */
1253         if (node->event) {
1254                 cmdlist->data[cmdlist->last++] = G2D_INTEN;
1255                 cmdlist->data[cmdlist->last++] = G2D_INTEN_ACF | G2D_INTEN_GCF;
1256                 cmdlist->data[cmdlist->last++] = G2D_DMA_HOLD_CMD;
1257                 cmdlist->data[cmdlist->last++] = G2D_LIST_HOLD;
1258         } else {
1259                 cmdlist->data[cmdlist->last++] = G2D_INTEN;
1260                 cmdlist->data[cmdlist->last++] = G2D_INTEN_ACF;
1261         }
1262
1263         /*
1264          * Check the size of cmdlist. The 2 that is added last comes from
1265          * the implicit G2D_BITBLT_START that is appended once we have
1266          * checked all the submitted commands.
1267          */
1268         size = cmdlist->last + req->cmd_nr * 2 + req->cmd_buf_nr * 2 + 2;
1269         if (size > G2D_CMDLIST_DATA_NUM) {
1270                 dev_err(dev, "cmdlist size is too big\n");
1271                 ret = -EINVAL;
1272                 goto err_free_event;
1273         }
1274
1275         cmd = (struct drm_exynos_g2d_cmd *)(unsigned long)req->cmd;
1276
1277         if (copy_from_user(cmdlist->data + cmdlist->last,
1278                                 (void __user *)cmd,
1279                                 sizeof(*cmd) * req->cmd_nr)) {
1280                 ret = -EFAULT;
1281                 goto err_free_event;
1282         }
1283         cmdlist->last += req->cmd_nr * 2;
1284
1285         ret = g2d_check_reg_offset(dev, node, req->cmd_nr, false);
1286         if (ret < 0)
1287                 goto err_free_event;
1288
1289         node->buf_info.map_nr = req->cmd_buf_nr;
1290         if (req->cmd_buf_nr) {
1291                 struct drm_exynos_g2d_cmd *cmd_buf;
1292
1293                 cmd_buf = (struct drm_exynos_g2d_cmd *)
1294                                 (unsigned long)req->cmd_buf;
1295
1296                 if (copy_from_user(cmdlist->data + cmdlist->last,
1297                                         (void __user *)cmd_buf,
1298                                         sizeof(*cmd_buf) * req->cmd_buf_nr)) {
1299                         ret = -EFAULT;
1300                         goto err_free_event;
1301                 }
1302                 cmdlist->last += req->cmd_buf_nr * 2;
1303
1304                 ret = g2d_check_reg_offset(dev, node, req->cmd_buf_nr, true);
1305                 if (ret < 0)
1306                         goto err_free_event;
1307
1308                 ret = g2d_map_cmdlist_gem(g2d, node, drm_dev, file);
1309                 if (ret < 0)
1310                         goto err_unmap;
1311         }
1312
1313         cmdlist->data[cmdlist->last++] = G2D_BITBLT_START;
1314         cmdlist->data[cmdlist->last++] = G2D_START_BITBLT;
1315
1316         /* head */
1317         cmdlist->head = cmdlist->last / 2;
1318
1319         /* tail */
1320         cmdlist->data[cmdlist->last] = 0;
1321
1322         g2d_add_cmdlist_to_inuse(g2d_priv, node);
1323
1324         return 0;
1325
1326 err_unmap:
1327         g2d_unmap_cmdlist_gem(g2d, node, file);
1328 err_free_event:
1329         if (node->event)
1330                 drm_event_cancel_free(drm_dev, &node->event->base);
1331 err:
1332         g2d_put_cmdlist(g2d, node);
1333         return ret;
1334 }
1335
1336 int exynos_g2d_exec_ioctl(struct drm_device *drm_dev, void *data,
1337                           struct drm_file *file)
1338 {
1339         struct drm_exynos_file_private *file_priv = file->driver_priv;
1340         struct exynos_drm_g2d_private *g2d_priv = file_priv->g2d_priv;
1341         struct device *dev;
1342         struct g2d_data *g2d;
1343         struct drm_exynos_g2d_exec *req = data;
1344         struct g2d_runqueue_node *runqueue_node;
1345         struct list_head *run_cmdlist;
1346         struct list_head *event_list;
1347
1348         if (!g2d_priv)
1349                 return -ENODEV;
1350
1351         dev = g2d_priv->dev;
1352         if (!dev)
1353                 return -ENODEV;
1354
1355         g2d = dev_get_drvdata(dev);
1356         if (!g2d)
1357                 return -EFAULT;
1358
1359         runqueue_node = kmem_cache_alloc(g2d->runqueue_slab, GFP_KERNEL);
1360         if (!runqueue_node)
1361                 return -ENOMEM;
1362
1363         run_cmdlist = &runqueue_node->run_cmdlist;
1364         event_list = &runqueue_node->event_list;
1365         INIT_LIST_HEAD(run_cmdlist);
1366         INIT_LIST_HEAD(event_list);
1367         init_completion(&runqueue_node->complete);
1368         runqueue_node->async = req->async;
1369
1370         list_splice_init(&g2d_priv->inuse_cmdlist, run_cmdlist);
1371         list_splice_init(&g2d_priv->event_list, event_list);
1372
1373         if (list_empty(run_cmdlist)) {
1374                 dev_err(dev, "there is no inuse cmdlist\n");
1375                 kmem_cache_free(g2d->runqueue_slab, runqueue_node);
1376                 return -EPERM;
1377         }
1378
1379         mutex_lock(&g2d->runqueue_mutex);
1380         runqueue_node->pid = current->pid;
1381         runqueue_node->filp = file;
1382         list_add_tail(&runqueue_node->list, &g2d->runqueue);
1383         mutex_unlock(&g2d->runqueue_mutex);
1384
1385         /* Let the runqueue know that there is work to do. */
1386         queue_work(g2d->g2d_workq, &g2d->runqueue_work);
1387
1388         if (runqueue_node->async)
1389                 goto out;
1390
1391         wait_for_completion(&runqueue_node->complete);
1392         g2d_free_runqueue_node(g2d, runqueue_node);
1393
1394 out:
1395         return 0;
1396 }
1397
1398 static int g2d_subdrv_probe(struct drm_device *drm_dev, struct device *dev)
1399 {
1400         struct g2d_data *g2d;
1401         int ret;
1402
1403         g2d = dev_get_drvdata(dev);
1404         if (!g2d)
1405                 return -EFAULT;
1406
1407         /* allocate dma-aware cmdlist buffer. */
1408         ret = g2d_init_cmdlist(g2d);
1409         if (ret < 0) {
1410                 dev_err(dev, "cmdlist init failed\n");
1411                 return ret;
1412         }
1413
1414         ret = drm_iommu_attach_device(drm_dev, dev);
1415         if (ret < 0) {
1416                 dev_err(dev, "failed to enable iommu.\n");
1417                 g2d_fini_cmdlist(g2d);
1418         }
1419
1420         return ret;
1421
1422 }
1423
1424 static void g2d_subdrv_remove(struct drm_device *drm_dev, struct device *dev)
1425 {
1426         drm_iommu_detach_device(drm_dev, dev);
1427 }
1428
1429 static int g2d_open(struct drm_device *drm_dev, struct device *dev,
1430                         struct drm_file *file)
1431 {
1432         struct drm_exynos_file_private *file_priv = file->driver_priv;
1433         struct exynos_drm_g2d_private *g2d_priv;
1434
1435         g2d_priv = kzalloc(sizeof(*g2d_priv), GFP_KERNEL);
1436         if (!g2d_priv)
1437                 return -ENOMEM;
1438
1439         g2d_priv->dev = dev;
1440         file_priv->g2d_priv = g2d_priv;
1441
1442         INIT_LIST_HEAD(&g2d_priv->inuse_cmdlist);
1443         INIT_LIST_HEAD(&g2d_priv->event_list);
1444         INIT_LIST_HEAD(&g2d_priv->userptr_list);
1445
1446         return 0;
1447 }
1448
1449 static void g2d_close(struct drm_device *drm_dev, struct device *dev,
1450                         struct drm_file *file)
1451 {
1452         struct drm_exynos_file_private *file_priv = file->driver_priv;
1453         struct exynos_drm_g2d_private *g2d_priv = file_priv->g2d_priv;
1454         struct g2d_data *g2d;
1455         struct g2d_cmdlist_node *node, *n;
1456
1457         if (!dev)
1458                 return;
1459
1460         g2d = dev_get_drvdata(dev);
1461         if (!g2d)
1462                 return;
1463
1464         /* Remove the runqueue nodes that belong to us. */
1465         mutex_lock(&g2d->runqueue_mutex);
1466         g2d_remove_runqueue_nodes(g2d, file);
1467         mutex_unlock(&g2d->runqueue_mutex);
1468
1469         /*
1470          * Wait for the runqueue worker to finish its current node.
1471          * After this the engine should no longer be accessing any
1472          * memory belonging to us.
1473          */
1474         g2d_wait_finish(g2d, file);
1475
1476         /*
1477          * Even after the engine is idle, there might still be stale cmdlists
1478          * (i.e. cmdlisst which we submitted but never executed) around, with
1479          * their corresponding GEM/userptr buffers.
1480          * Properly unmap these buffers here.
1481          */
1482         mutex_lock(&g2d->cmdlist_mutex);
1483         list_for_each_entry_safe(node, n, &g2d_priv->inuse_cmdlist, list) {
1484                 g2d_unmap_cmdlist_gem(g2d, node, file);
1485                 list_move_tail(&node->list, &g2d->free_cmdlist);
1486         }
1487         mutex_unlock(&g2d->cmdlist_mutex);
1488
1489         /* release all g2d_userptr in pool. */
1490         g2d_userptr_free_all(drm_dev, g2d, file);
1491
1492         kfree(file_priv->g2d_priv);
1493 }
1494
1495 static int g2d_probe(struct platform_device *pdev)
1496 {
1497         struct device *dev = &pdev->dev;
1498         struct resource *res;
1499         struct g2d_data *g2d;
1500         struct exynos_drm_subdrv *subdrv;
1501         int ret;
1502
1503         g2d = devm_kzalloc(dev, sizeof(*g2d), GFP_KERNEL);
1504         if (!g2d)
1505                 return -ENOMEM;
1506
1507         g2d->runqueue_slab = kmem_cache_create("g2d_runqueue_slab",
1508                         sizeof(struct g2d_runqueue_node), 0, 0, NULL);
1509         if (!g2d->runqueue_slab)
1510                 return -ENOMEM;
1511
1512         g2d->dev = dev;
1513
1514         g2d->g2d_workq = create_singlethread_workqueue("g2d");
1515         if (!g2d->g2d_workq) {
1516                 dev_err(dev, "failed to create workqueue\n");
1517                 ret = -EINVAL;
1518                 goto err_destroy_slab;
1519         }
1520
1521         INIT_WORK(&g2d->runqueue_work, g2d_runqueue_worker);
1522         INIT_LIST_HEAD(&g2d->free_cmdlist);
1523         INIT_LIST_HEAD(&g2d->runqueue);
1524
1525         mutex_init(&g2d->cmdlist_mutex);
1526         mutex_init(&g2d->runqueue_mutex);
1527
1528         g2d->gate_clk = devm_clk_get(dev, "fimg2d");
1529         if (IS_ERR(g2d->gate_clk)) {
1530                 dev_err(dev, "failed to get gate clock\n");
1531                 ret = PTR_ERR(g2d->gate_clk);
1532                 goto err_destroy_workqueue;
1533         }
1534
1535         pm_runtime_use_autosuspend(dev);
1536         pm_runtime_set_autosuspend_delay(dev, 2000);
1537         pm_runtime_enable(dev);
1538         clear_bit(G2D_BIT_SUSPEND_RUNQUEUE, &g2d->flags);
1539         clear_bit(G2D_BIT_ENGINE_BUSY, &g2d->flags);
1540
1541         res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
1542
1543         g2d->regs = devm_ioremap_resource(dev, res);
1544         if (IS_ERR(g2d->regs)) {
1545                 ret = PTR_ERR(g2d->regs);
1546                 goto err_put_clk;
1547         }
1548
1549         g2d->irq = platform_get_irq(pdev, 0);
1550         if (g2d->irq < 0) {
1551                 dev_err(dev, "failed to get irq\n");
1552                 ret = g2d->irq;
1553                 goto err_put_clk;
1554         }
1555
1556         ret = devm_request_irq(dev, g2d->irq, g2d_irq_handler, 0,
1557                                                                 "drm_g2d", g2d);
1558         if (ret < 0) {
1559                 dev_err(dev, "irq request failed\n");
1560                 goto err_put_clk;
1561         }
1562
1563         g2d->max_pool = MAX_POOL;
1564
1565         platform_set_drvdata(pdev, g2d);
1566
1567         subdrv = &g2d->subdrv;
1568         subdrv->dev = dev;
1569         subdrv->probe = g2d_subdrv_probe;
1570         subdrv->remove = g2d_subdrv_remove;
1571         subdrv->open = g2d_open;
1572         subdrv->close = g2d_close;
1573
1574         ret = exynos_drm_subdrv_register(subdrv);
1575         if (ret < 0) {
1576                 dev_err(dev, "failed to register drm g2d device\n");
1577                 goto err_put_clk;
1578         }
1579
1580         dev_info(dev, "The Exynos G2D (ver %d.%d) successfully probed.\n",
1581                         G2D_HW_MAJOR_VER, G2D_HW_MINOR_VER);
1582
1583         return 0;
1584
1585 err_put_clk:
1586         pm_runtime_disable(dev);
1587 err_destroy_workqueue:
1588         destroy_workqueue(g2d->g2d_workq);
1589 err_destroy_slab:
1590         kmem_cache_destroy(g2d->runqueue_slab);
1591         return ret;
1592 }
1593
1594 static int g2d_remove(struct platform_device *pdev)
1595 {
1596         struct g2d_data *g2d = platform_get_drvdata(pdev);
1597
1598         /* Suspend operation and wait for engine idle. */
1599         set_bit(G2D_BIT_SUSPEND_RUNQUEUE, &g2d->flags);
1600         g2d_wait_finish(g2d, NULL);
1601
1602         cancel_work_sync(&g2d->runqueue_work);
1603         exynos_drm_subdrv_unregister(&g2d->subdrv);
1604
1605         /* There should be no locking needed here. */
1606         g2d_remove_runqueue_nodes(g2d, NULL);
1607
1608         pm_runtime_dont_use_autosuspend(&pdev->dev);
1609         pm_runtime_disable(&pdev->dev);
1610
1611         g2d_fini_cmdlist(g2d);
1612         destroy_workqueue(g2d->g2d_workq);
1613         kmem_cache_destroy(g2d->runqueue_slab);
1614
1615         return 0;
1616 }
1617
1618 #ifdef CONFIG_PM_SLEEP
1619 static int g2d_suspend(struct device *dev)
1620 {
1621         struct g2d_data *g2d = dev_get_drvdata(dev);
1622
1623         /*
1624          * Suspend the runqueue worker operation and wait until the G2D
1625          * engine is idle.
1626          */
1627         set_bit(G2D_BIT_SUSPEND_RUNQUEUE, &g2d->flags);
1628         g2d_wait_finish(g2d, NULL);
1629         flush_work(&g2d->runqueue_work);
1630
1631         return 0;
1632 }
1633
1634 static int g2d_resume(struct device *dev)
1635 {
1636         struct g2d_data *g2d = dev_get_drvdata(dev);
1637
1638         clear_bit(G2D_BIT_SUSPEND_RUNQUEUE, &g2d->flags);
1639         queue_work(g2d->g2d_workq, &g2d->runqueue_work);
1640
1641         return 0;
1642 }
1643 #endif
1644
1645 #ifdef CONFIG_PM
1646 static int g2d_runtime_suspend(struct device *dev)
1647 {
1648         struct g2d_data *g2d = dev_get_drvdata(dev);
1649
1650         clk_disable_unprepare(g2d->gate_clk);
1651
1652         return 0;
1653 }
1654
1655 static int g2d_runtime_resume(struct device *dev)
1656 {
1657         struct g2d_data *g2d = dev_get_drvdata(dev);
1658         int ret;
1659
1660         ret = clk_prepare_enable(g2d->gate_clk);
1661         if (ret < 0)
1662                 dev_warn(dev, "failed to enable clock.\n");
1663
1664         return ret;
1665 }
1666 #endif
1667
1668 static const struct dev_pm_ops g2d_pm_ops = {
1669         SET_SYSTEM_SLEEP_PM_OPS(g2d_suspend, g2d_resume)
1670         SET_RUNTIME_PM_OPS(g2d_runtime_suspend, g2d_runtime_resume, NULL)
1671 };
1672
1673 static const struct of_device_id exynos_g2d_match[] = {
1674         { .compatible = "samsung,exynos5250-g2d" },
1675         { .compatible = "samsung,exynos4212-g2d" },
1676         {},
1677 };
1678 MODULE_DEVICE_TABLE(of, exynos_g2d_match);
1679
1680 struct platform_driver g2d_driver = {
1681         .probe          = g2d_probe,
1682         .remove         = g2d_remove,
1683         .driver         = {
1684                 .name   = "exynos-drm-g2d",
1685                 .owner  = THIS_MODULE,
1686                 .pm     = &g2d_pm_ops,
1687                 .of_match_table = exynos_g2d_match,
1688         },
1689 };