drivers/misc/mediatek/gpu/mt8127/mali/mali/linux/mali_memory_dma_buf.c

   1 /*
   2  * This confidential and proprietary software may be used only as
   3  * authorised by a licensing agreement from ARM Limited
   4  * (C) COPYRIGHT 2012-2013 ARM Limited
   5  * ALL RIGHTS RESERVED
   6  * The entire notice above must be reproduced on all authorised
   7  * copies and copies may only be made to the extent permitted
   8  * by a licensing agreement from ARM Limited.
   9  */
  10
  11 #include <linux/fs.h>      /* file system operations */
  12 #include <asm/uaccess.h>        /* user space access */
  13 #include <linux/dma-buf.h>
  14 #include <linux/scatterlist.h>
  15 #include <linux/rbtree.h>
  16 #include <linux/platform_device.h>
  17 #include <linux/wait.h>
  18 #include <linux/sched.h>
  19 #include <linux/mutex.h>
  20
  21 #include "mali_ukk.h"
  22 #include "mali_osk.h"
  23 #include "mali_kernel_common.h"
  24 #include "mali_session.h"
  25 #include "mali_kernel_linux.h"
  26
  27 #include "mali_memory.h"
  28 #include "mali_memory_dma_buf.h"
  29
  30 #include "mali_pp_job.h"
  31
  32 static void mali_dma_buf_unmap(struct mali_dma_buf_attachment *mem);
  33
  34 struct mali_dma_buf_attachment {
  35         struct dma_buf *buf;
  36         struct dma_buf_attachment *attachment;
  37         struct sg_table *sgt;
  38         struct mali_session_data *session;
  39         int map_ref;
  40         struct mutex map_lock;
  41         mali_bool is_mapped;
  42         wait_queue_head_t wait_queue;
  43 };
  44
  45 static void mali_dma_buf_release(struct mali_dma_buf_attachment *mem)
  46 {
  47         MALI_DEBUG_PRINT(3, ("Mali DMA-buf: release attachment %p\n", mem));
  48
  49         MALI_DEBUG_ASSERT_POINTER(mem);
  50         MALI_DEBUG_ASSERT_POINTER(mem->attachment);
  51         MALI_DEBUG_ASSERT_POINTER(mem->buf);
  52
  53 #if defined(CONFIG_MALI_DMA_BUF_MAP_ON_ATTACH)
  54         /* We mapped implicitly on attach, so we need to unmap on release */
  55         mali_dma_buf_unmap(mem);
  56 #endif
  57
  58         /* Wait for buffer to become unmapped */
  59         wait_event(mem->wait_queue, !mem->is_mapped);
  60         MALI_DEBUG_ASSERT(!mem->is_mapped);
  61
  62         dma_buf_detach(mem->buf, mem->attachment);
  63         dma_buf_put(mem->buf);
  64
  65         _mali_osk_free(mem);
  66 }
  67
  68 void mali_mem_dma_buf_release(mali_mem_allocation *descriptor)
  69 {
  70         struct mali_dma_buf_attachment *mem = descriptor->dma_buf.attachment;
  71
  72         mali_dma_buf_release(mem);
  73 }
  74
  75 /*
  76  * Map DMA buf attachment \a mem into \a session at virtual address \a virt.
  77  */
  78 static int mali_dma_buf_map(struct mali_dma_buf_attachment *mem, struct mali_session_data *session, u32 virt, u32 flags)
  79 {
  80         struct mali_page_directory *pagedir;
  81         struct scatterlist *sg;
  82         int i;
  83
  84         MALI_DEBUG_ASSERT_POINTER(mem);
  85         MALI_DEBUG_ASSERT_POINTER(session);
  86         MALI_DEBUG_ASSERT(mem->session == session);
  87
  88         mutex_lock(&mem->map_lock);
  89
  90         mem->map_ref++;
  91
  92         MALI_DEBUG_PRINT(5, ("Mali DMA-buf: map attachment %p, new map_ref = %d\n", mem, mem->map_ref));
  93
  94         if (1 == mem->map_ref) {
  95                 /* First reference taken, so we need to map the dma buf */
  96                 MALI_DEBUG_ASSERT(!mem->is_mapped);
  97
  98                 pagedir = mali_session_get_page_directory(session);
  99                 MALI_DEBUG_ASSERT_POINTER(pagedir);
 100
 101                 mem->sgt = dma_buf_map_attachment(mem->attachment, DMA_BIDIRECTIONAL);
 102                 if (IS_ERR_OR_NULL(mem->sgt)) {
 103                         MALI_DEBUG_PRINT_ERROR(("Failed to map dma-buf attachment\n"));
 104                         return -EFAULT;
 105                 }
 106
 107                 for_each_sg(mem->sgt->sgl, sg, mem->sgt->nents, i) {
 108                         u32 size = sg_dma_len(sg);
 109                         dma_addr_t phys = sg_dma_address(sg);
 110
 111                         /* sg must be page aligned. */
 112                         MALI_DEBUG_ASSERT(0 == size % MALI_MMU_PAGE_SIZE);
 113
 114                         mali_mmu_pagedir_update(pagedir, virt, phys, size, MALI_MMU_FLAGS_DEFAULT);
 115
 116                         virt += size;
 117                 }
 118
 119                 if (flags & MALI_MEM_FLAG_MALI_GUARD_PAGE) {
 120                         u32 guard_phys;
 121                         MALI_DEBUG_PRINT(7, ("Mapping in extra guard page\n"));
 122
 123                         guard_phys = sg_dma_address(mem->sgt->sgl);
 124                         mali_mmu_pagedir_update(pagedir, virt, guard_phys, MALI_MMU_PAGE_SIZE, MALI_MMU_FLAGS_DEFAULT);
 125                 }
 126
 127                 mem->is_mapped = MALI_TRUE;
 128                 mutex_unlock(&mem->map_lock);
 129
 130                 /* Wake up any thread waiting for buffer to become mapped */
 131                 wake_up_all(&mem->wait_queue);
 132         } else {
 133                 MALI_DEBUG_ASSERT(mem->is_mapped);
 134                 mutex_unlock(&mem->map_lock);
 135         }
 136
 137         return 0;
 138 }
 139
 140 static void mali_dma_buf_unmap(struct mali_dma_buf_attachment *mem)
 141 {
 142         MALI_DEBUG_ASSERT_POINTER(mem);
 143         MALI_DEBUG_ASSERT_POINTER(mem->attachment);
 144         MALI_DEBUG_ASSERT_POINTER(mem->buf);
 145
 146         mutex_lock(&mem->map_lock);
 147
 148         mem->map_ref--;
 149
 150         MALI_DEBUG_PRINT(5, ("Mali DMA-buf: unmap attachment %p, new map_ref = %d\n", mem, mem->map_ref));
 151
 152         if (0 == mem->map_ref) {
 153                 dma_buf_unmap_attachment(mem->attachment, mem->sgt, DMA_BIDIRECTIONAL);
 154
 155                 mem->is_mapped = MALI_FALSE;
 156         }
 157
 158         mutex_unlock(&mem->map_lock);
 159
 160         /* Wake up any thread waiting for buffer to become unmapped */
 161         wake_up_all(&mem->wait_queue);
 162 }
 163
 164 #if !defined(CONFIG_MALI_DMA_BUF_MAP_ON_ATTACH)
 165 int mali_dma_buf_map_job(struct mali_pp_job *job)
 166 {
 167         mali_mem_allocation *descriptor;
 168         struct mali_dma_buf_attachment *mem;
 169         _mali_osk_errcode_t err;
 170         int i;
 171         int ret = 0;
 172
 173         _mali_osk_mutex_wait(job->session->memory_lock);
 174
 175         for (i = 0; i < job->num_memory_cookies; i++) {
 176                 int cookie = job->memory_cookies[i];
 177
 178                 if (0 == cookie) {
 179                         /* 0 is not a valid cookie */
 180                         MALI_DEBUG_ASSERT(NULL == job->dma_bufs[i]);
 181                         continue;
 182                 }
 183
 184                 MALI_DEBUG_ASSERT(0 < cookie);
 185
 186                 err = mali_descriptor_mapping_get(job->session->descriptor_mapping,
 187                                                   cookie, (void**)&descriptor);
 188
 189                 if (_MALI_OSK_ERR_OK != err) {
 190                         MALI_DEBUG_PRINT_ERROR(("Mali DMA-buf: Failed to get descriptor for cookie %d\n", cookie));
 191                         ret = -EFAULT;
 192                         MALI_DEBUG_ASSERT(NULL == job->dma_bufs[i]);
 193                         continue;
 194                 }
 195
 196                 if (MALI_MEM_DMA_BUF != descriptor->type) {
 197                         /* Not a DMA-buf */
 198                         MALI_DEBUG_ASSERT(NULL == job->dma_bufs[i]);
 199                         continue;
 200                 }
 201
 202                 mem = descriptor->dma_buf.attachment;
 203
 204                 MALI_DEBUG_ASSERT_POINTER(mem);
 205                 MALI_DEBUG_ASSERT(mem->session == job->session);
 206
 207                 err = mali_dma_buf_map(mem, mem->session, descriptor->mali_mapping.addr, descriptor->flags);
 208                 if (0 != err) {
 209                         MALI_DEBUG_PRINT_ERROR(("Mali DMA-buf: Failed to map dma-buf for cookie %d at mali address %x\b",
 210                                                 cookie, descriptor->mali_mapping.addr));
 211                         ret = -EFAULT;
 212                         MALI_DEBUG_ASSERT(NULL == job->dma_bufs[i]);
 213                         continue;
 214                 }
 215
 216                 /* Add mem to list of DMA-bufs mapped for this job */
 217                 job->dma_bufs[i] = mem;
 218         }
 219
 220         _mali_osk_mutex_signal(job->session->memory_lock);
 221
 222         return ret;
 223 }
 224
 225 void mali_dma_buf_unmap_job(struct mali_pp_job *job)
 226 {
 227         int i;
 228         for (i = 0; i < job->num_dma_bufs; i++) {
 229                 if (NULL == job->dma_bufs[i]) continue;
 230
 231                 mali_dma_buf_unmap(job->dma_bufs[i]);
 232                 job->dma_bufs[i] = NULL;
 233         }
 234 }
 235 #endif /* !CONFIG_MALI_DMA_BUF_MAP_ON_ATTACH */
 236
 237 int mali_attach_dma_buf(struct mali_session_data *session, _mali_uk_attach_dma_buf_s __user *user_arg)
 238 {
 239         struct dma_buf *buf;
 240         struct mali_dma_buf_attachment *mem;
 241         _mali_uk_attach_dma_buf_s args;
 242         mali_mem_allocation *descriptor;
 243         int md;
 244         int fd;
 245
 246         /* Get call arguments from user space. copy_from_user returns how many bytes which where NOT copied */
 247         if (0 != copy_from_user(&args, (void __user *)user_arg, sizeof(_mali_uk_attach_dma_buf_s))) {
 248                 return -EFAULT;
 249         }
 250
 251         if (args.mali_address & ~PAGE_MASK) {
 252                 MALI_DEBUG_PRINT_ERROR(("Requested address (0x%08x) is not page aligned\n", args.mali_address));
 253                 return -EINVAL;
 254         }
 255
 256         if (args.mali_address >= args.mali_address + args.size) {
 257                 MALI_DEBUG_PRINT_ERROR(("Requested address and size (0x%08x + 0x%08x) is too big\n", args.mali_address, args.size));
 258                 return -EINVAL;
 259         }
 260
 261         fd = args.mem_fd;
 262
 263         buf = dma_buf_get(fd);
 264         if (IS_ERR_OR_NULL(buf)) {
 265                 MALI_DEBUG_PRINT_ERROR(("Failed to get dma-buf from fd: %d\n", fd));
 266                 return PTR_RET(buf);
 267         }
 268
 269         /* Currently, mapping of the full buffer are supported. */
 270         if (args.size != buf->size) {
 271                 MALI_DEBUG_PRINT_ERROR(("dma-buf size doesn't match mapping size.\n"));
 272                 dma_buf_put(buf);
 273                 return -EINVAL;
 274         }
 275
 276         mem = _mali_osk_calloc(1, sizeof(struct mali_dma_buf_attachment));
 277         if (NULL == mem) {
 278                 MALI_DEBUG_PRINT_ERROR(("Failed to allocate dma-buf tracing struct\n"));
 279                 dma_buf_put(buf);
 280                 return -ENOMEM;
 281         }
 282
 283         mem->buf = buf;
 284         mem->session = session;
 285         mem->map_ref = 0;
 286         mutex_init(&mem->map_lock);
 287         init_waitqueue_head(&mem->wait_queue);
 288
 289         mem->attachment = dma_buf_attach(mem->buf, &mali_platform_device->dev);
 290         if (NULL == mem->attachment) {
 291                 MALI_DEBUG_PRINT_ERROR(("Failed to attach to dma-buf %d\n", fd));
 292                 dma_buf_put(mem->buf);
 293                 _mali_osk_free(mem);
 294                 return -EFAULT;
 295         }
 296
 297         /* Set up Mali memory descriptor */
 298         descriptor = mali_mem_descriptor_create(session, MALI_MEM_DMA_BUF);
 299         if (NULL == descriptor) {
 300                 MALI_DEBUG_PRINT_ERROR(("Failed to allocate descriptor dma-buf %d\n", fd));
 301                 mali_dma_buf_release(mem);
 302                 return -ENOMEM;
 303         }
 304
 305         descriptor->size = args.size;
 306         descriptor->mali_mapping.addr = args.mali_address;
 307
 308         descriptor->dma_buf.attachment = mem;
 309
 310         descriptor->flags |= MALI_MEM_FLAG_DONT_CPU_MAP;
 311         if (args.flags & _MALI_MAP_EXTERNAL_MAP_GUARD_PAGE) {
 312                 descriptor->flags = MALI_MEM_FLAG_MALI_GUARD_PAGE;
 313         }
 314
 315         _mali_osk_mutex_wait(session->memory_lock);
 316
 317         /* Map dma-buf into this session's page tables */
 318         if (_MALI_OSK_ERR_OK != mali_mem_mali_map_prepare(descriptor)) {
 319                 _mali_osk_mutex_signal(session->memory_lock);
 320                 MALI_DEBUG_PRINT_ERROR(("Failed to map dma-buf on Mali\n"));
 321                 mali_mem_descriptor_destroy(descriptor);
 322                 mali_dma_buf_release(mem);
 323                 return -ENOMEM;
 324         }
 325
 326 #if defined(CONFIG_MALI_DMA_BUF_MAP_ON_ATTACH)
 327         /* Map memory into session's Mali virtual address space. */
 328
 329         if (0 != mali_dma_buf_map(mem, session, descriptor->mali_mapping.addr, descriptor->flags)) {
 330                 mali_mem_mali_map_free(descriptor);
 331                 _mali_osk_mutex_signal(session->memory_lock);
 332
 333                 MALI_DEBUG_PRINT_ERROR(("Failed to map dma-buf %d into Mali address space\n", fd));
 334                 mali_mem_descriptor_destroy(descriptor);
 335                 mali_dma_buf_release(mem);
 336                 return -ENOMEM;
 337         }
 338
 339 #endif
 340
 341         _mali_osk_mutex_signal(session->memory_lock);
 342
 343         /* Get descriptor mapping for memory. */
 344         if (_MALI_OSK_ERR_OK != mali_descriptor_mapping_allocate_mapping(session->descriptor_mapping, descriptor, &md)) {
 345                 _mali_osk_mutex_wait(session->memory_lock);
 346                 mali_mem_mali_map_free(descriptor);
 347                 _mali_osk_mutex_signal(session->memory_lock);
 348
 349                 MALI_DEBUG_PRINT_ERROR(("Failed to create descriptor mapping for dma-buf %d\n", fd));
 350                 mali_mem_descriptor_destroy(descriptor);
 351                 mali_dma_buf_release(mem);
 352                 return -EFAULT;
 353         }
 354
 355         /* Return stuff to user space */
 356         if (0 != put_user(md, &user_arg->cookie)) {
 357                 _mali_osk_mutex_wait(session->memory_lock);
 358                 mali_mem_mali_map_free(descriptor);
 359                 _mali_osk_mutex_signal(session->memory_lock);
 360
 361                 MALI_DEBUG_PRINT_ERROR(("Failed to return descriptor to user space for dma-buf %d\n", fd));
 362                 mali_descriptor_mapping_free(session->descriptor_mapping, md);
 363                 mali_dma_buf_release(mem);
 364                 return -EFAULT;
 365         }
 366
 367         return 0;
 368 }
 369
 370 int mali_release_dma_buf(struct mali_session_data *session, _mali_uk_release_dma_buf_s __user *user_arg)
 371 {
 372         int ret = 0;
 373         _mali_uk_release_dma_buf_s args;
 374         mali_mem_allocation *descriptor;
 375
 376         /* get call arguments from user space. copy_from_user returns how many bytes which where NOT copied */
 377         if ( 0 != copy_from_user(&args, (void __user *)user_arg, sizeof(_mali_uk_release_dma_buf_s)) ) {
 378                 return -EFAULT;
 379         }
 380
 381         MALI_DEBUG_PRINT(3, ("Mali DMA-buf: release descriptor cookie %d\n", args.cookie));
 382
 383         _mali_osk_mutex_wait(session->memory_lock);
 384
 385         descriptor = mali_descriptor_mapping_free(session->descriptor_mapping, args.cookie);
 386
 387         if (NULL != descriptor) {
 388                 MALI_DEBUG_PRINT(3, ("Mali DMA-buf: Releasing dma-buf at mali address %x\n", descriptor->mali_mapping.addr));
 389
 390                 mali_mem_mali_map_free(descriptor);
 391
 392                 mali_dma_buf_release(descriptor->dma_buf.attachment);
 393
 394                 mali_mem_descriptor_destroy(descriptor);
 395         } else {
 396                 MALI_DEBUG_PRINT_ERROR(("Invalid memory descriptor %d used to release dma-buf\n", args.cookie));
 397                 ret = -EINVAL;
 398         }
 399
 400         _mali_osk_mutex_signal(session->memory_lock);
 401
 402         /* Return the error that _mali_ukk_map_external_ump_mem produced */
 403         return ret;
 404 }
 405
 406 int mali_dma_buf_get_size(struct mali_session_data *session, _mali_uk_dma_buf_get_size_s __user *user_arg)
 407 {
 408         _mali_uk_dma_buf_get_size_s args;
 409         int fd;
 410         struct dma_buf *buf;
 411
 412         /* get call arguments from user space. copy_from_user returns how many bytes which where NOT copied */
 413         if ( 0 != copy_from_user(&args, (void __user *)user_arg, sizeof(_mali_uk_dma_buf_get_size_s)) ) {
 414                 return -EFAULT;
 415         }
 416
 417         /* Do DMA-BUF stuff */
 418         fd = args.mem_fd;
 419
 420         buf = dma_buf_get(fd);
 421         if (IS_ERR_OR_NULL(buf)) {
 422                 MALI_DEBUG_PRINT_ERROR(("Failed to get dma-buf from fd: %d\n", fd));
 423                 return PTR_RET(buf);
 424         }
 425
 426         if (0 != put_user(buf->size, &user_arg->size)) {
 427                 dma_buf_put(buf);
 428                 return -EFAULT;
 429         }
 430
 431         dma_buf_put(buf);
 432
 433         return 0;
 434 }