target/linux/brcm2708/patches-3.14/0008-cma-Add-vc_cma-driver-to-enable-use-of-CMA.patch

   1 From 0db77c38e5817cf501d2bb29d21e7389491078d3 Mon Sep 17 00:00:00 2001
   2 From: popcornmix <popcornmix@gmail.com>
   3 Date: Wed, 3 Jul 2013 00:31:47 +0100
   4 Subject: [PATCH 08/54] cma: Add vc_cma driver to enable use of CMA
   5
   6 Signed-off-by: popcornmix <popcornmix@gmail.com>
   7 ---
   8  drivers/char/Kconfig                  |    2 +
   9  drivers/char/Makefile                 |    2 +
  10  drivers/char/broadcom/Kconfig         |   16 +
  11  drivers/char/broadcom/Makefile        |    1 +
  12  drivers/char/broadcom/vc_cma/Makefile |   14 +
  13  drivers/char/broadcom/vc_cma/vc_cma.c | 1143 +++++++++++++++++++++++++++++++++
  14  drivers/misc/Makefile                 |    2 +-
  15  include/linux/broadcom/vc_cma.h       |   29 +
  16  8 files changed, 1208 insertions(+), 1 deletion(-)
  17  create mode 100644 drivers/char/broadcom/Kconfig
  18  create mode 100644 drivers/char/broadcom/Makefile
  19  create mode 100644 drivers/char/broadcom/vc_cma/Makefile
  20  create mode 100644 drivers/char/broadcom/vc_cma/vc_cma.c
  21  create mode 100644 include/linux/broadcom/vc_cma.h
  22
  23 --- a/drivers/char/Kconfig
  24 +++ b/drivers/char/Kconfig
  25 @@ -581,6 +581,8 @@ config DEVPORT
  26
  27  source "drivers/s390/char/Kconfig"
  28
  29 +source "drivers/char/broadcom/Kconfig"
  30 +
  31  config MSM_SMD_PKT
  32         bool "Enable device interface for some SMD packet ports"
  33         default n
  34 --- a/drivers/char/Makefile
  35 +++ b/drivers/char/Makefile
  36 @@ -61,3 +61,5 @@ obj-$(CONFIG_JS_RTC)          += js-rtc.o
  37  js-rtc-y = rtc.o
  38
  39  obj-$(CONFIG_TILE_SROM)                += tile-srom.o
  40 +
  41 +obj-$(CONFIG_BRCM_CHAR_DRIVERS) += broadcom/
  42 --- /dev/null
  43 +++ b/drivers/char/broadcom/Kconfig
  44 @@ -0,0 +1,16 @@
  45 +#
  46 +# Broadcom char driver config
  47 +#
  48 +
  49 +menuconfig BRCM_CHAR_DRIVERS
  50 +       bool "Broadcom Char Drivers"
  51 +       help
  52 +         Broadcom's char drivers
  53 +
  54 +config BCM_VC_CMA
  55 +       bool "Videocore CMA"
  56 +       depends on CMA && BRCM_CHAR_DRIVERS && BCM2708_VCHIQ
  57 +       default n
  58 +        help
  59 +          Helper for videocore CMA access.
  60 +
  61 --- /dev/null
  62 +++ b/drivers/char/broadcom/Makefile
  63 @@ -0,0 +1 @@
  64 +obj-$(CONFIG_BCM_VC_CMA)       += vc_cma/
  65 --- /dev/null
  66 +++ b/drivers/char/broadcom/vc_cma/Makefile
  67 @@ -0,0 +1,14 @@
  68 +ccflags-y  += -Wall -Wstrict-prototypes -Wno-trigraphs
  69 +ccflags-y  += -Werror
  70 +ccflags-y  += -Iinclude/linux/broadcom
  71 +ccflags-y  += -Idrivers/misc/vc04_services
  72 +ccflags-y  += -Idrivers/misc/vc04_services/interface/vchi
  73 +ccflags-y  += -Idrivers/misc/vc04_services/interface/vchiq_arm
  74 +
  75 +ccflags-y  += -D__KERNEL__
  76 +ccflags-y  += -D__linux__
  77 +ccflags-y  += -Werror
  78 +
  79 +obj-$(CONFIG_BCM_VC_CMA) += vc-cma.o
  80 +
  81 +vc-cma-objs := vc_cma.o
  82 --- /dev/null
  83 +++ b/drivers/char/broadcom/vc_cma/vc_cma.c
  84 @@ -0,0 +1,1143 @@
  85 +/**
  86 + * Copyright (c) 2010-2012 Broadcom. All rights reserved.
  87 + *
  88 + * Redistribution and use in source and binary forms, with or without
  89 + * modification, are permitted provided that the following conditions
  90 + * are met:
  91 + * 1. Redistributions of source code must retain the above copyright
  92 + *    notice, this list of conditions, and the following disclaimer,
  93 + *    without modification.
  94 + * 2. Redistributions in binary form must reproduce the above copyright
  95 + *    notice, this list of conditions and the following disclaimer in the
  96 + *    documentation and/or other materials provided with the distribution.
  97 + * 3. The names of the above-listed copyright holders may not be used
  98 + *    to endorse or promote products derived from this software without
  99 + *    specific prior written permission.
 100 + *
 101 + * ALTERNATIVELY, this software may be distributed under the terms of the
 102 + * GNU General Public License ("GPL") version 2, as published by the Free
 103 + * Software Foundation.
 104 + *
 105 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 106 + * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 107 + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 108 + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 109 + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 110 + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 111 + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 112 + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 113 + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 114 + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 115 + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 116 + */
 117 +
 118 +#include <linux/kernel.h>
 119 +#include <linux/module.h>
 120 +#include <linux/kthread.h>
 121 +#include <linux/fs.h>
 122 +#include <linux/device.h>
 123 +#include <linux/cdev.h>
 124 +#include <linux/mm.h>
 125 +#include <linux/proc_fs.h>
 126 +#include <linux/seq_file.h>
 127 +#include <linux/dma-mapping.h>
 128 +#include <linux/dma-contiguous.h>
 129 +#include <linux/platform_device.h>
 130 +#include <linux/uaccess.h>
 131 +#include <asm/cacheflush.h>
 132 +
 133 +#include "vc_cma.h"
 134 +
 135 +#include "vchiq_util.h"
 136 +#include "vchiq_connected.h"
 137 +//#include "debug_sym.h"
 138 +//#include "vc_mem.h"
 139 +
 140 +#define DRIVER_NAME  "vc-cma"
 141 +
 142 +#define LOG_DBG(fmt, ...) \
 143 +       if (vc_cma_debug) \
 144 +               printk(KERN_INFO fmt "\n", ##__VA_ARGS__)
 145 +#define LOG_ERR(fmt, ...) \
 146 +       printk(KERN_ERR fmt "\n", ##__VA_ARGS__)
 147 +
 148 +#define VC_CMA_FOURCC VCHIQ_MAKE_FOURCC('C', 'M', 'A', ' ')
 149 +#define VC_CMA_VERSION 2
 150 +
 151 +#define VC_CMA_CHUNK_ORDER 6   /* 256K */
 152 +#define VC_CMA_CHUNK_SIZE (4096 << VC_CMA_CHUNK_ORDER)
 153 +#define VC_CMA_MAX_PARAMS_PER_MSG \
 154 +       ((VCHIQ_MAX_MSG_SIZE - sizeof(unsigned short))/sizeof(unsigned short))
 155 +#define VC_CMA_RESERVE_COUNT_MAX 16
 156 +
 157 +#define PAGES_PER_CHUNK (VC_CMA_CHUNK_SIZE / PAGE_SIZE)
 158 +
 159 +#define VCADDR_TO_PHYSADDR(vcaddr) (mm_vc_mem_phys_addr + vcaddr)
 160 +
 161 +#define loud_error(...) \
 162 +       LOG_ERR("===== " __VA_ARGS__)
 163 +
 164 +enum {
 165 +       VC_CMA_MSG_QUIT,
 166 +       VC_CMA_MSG_OPEN,
 167 +       VC_CMA_MSG_TICK,
 168 +       VC_CMA_MSG_ALLOC,       /* chunk count */
 169 +       VC_CMA_MSG_FREE,        /* chunk, chunk, ... */
 170 +       VC_CMA_MSG_ALLOCATED,   /* chunk, chunk, ... */
 171 +       VC_CMA_MSG_REQUEST_ALLOC,       /* chunk count */
 172 +       VC_CMA_MSG_REQUEST_FREE,        /* chunk count */
 173 +       VC_CMA_MSG_RESERVE,     /* bytes lo, bytes hi */
 174 +       VC_CMA_MSG_UPDATE_RESERVE,
 175 +       VC_CMA_MSG_MAX
 176 +};
 177 +
 178 +struct cma_msg {
 179 +       unsigned short type;
 180 +       unsigned short params[VC_CMA_MAX_PARAMS_PER_MSG];
 181 +};
 182 +
 183 +struct vc_cma_reserve_user {
 184 +       unsigned int pid;
 185 +       unsigned int reserve;
 186 +};
 187 +
 188 +/* Device (/dev) related variables */
 189 +static dev_t vc_cma_devnum;
 190 +static struct class *vc_cma_class;
 191 +static struct cdev vc_cma_cdev;
 192 +static int vc_cma_inited;
 193 +static int vc_cma_debug;
 194 +
 195 +/* Proc entry */
 196 +static struct proc_dir_entry *vc_cma_proc_entry;
 197 +
 198 +phys_addr_t vc_cma_base;
 199 +struct page *vc_cma_base_page;
 200 +unsigned int vc_cma_size;
 201 +EXPORT_SYMBOL(vc_cma_size);
 202 +unsigned int vc_cma_initial;
 203 +unsigned int vc_cma_chunks;
 204 +unsigned int vc_cma_chunks_used;
 205 +unsigned int vc_cma_chunks_reserved;
 206 +
 207 +static int in_loud_error;
 208 +
 209 +unsigned int vc_cma_reserve_total;
 210 +unsigned int vc_cma_reserve_count;
 211 +struct vc_cma_reserve_user vc_cma_reserve_users[VC_CMA_RESERVE_COUNT_MAX];
 212 +static DEFINE_SEMAPHORE(vc_cma_reserve_mutex);
 213 +static DEFINE_SEMAPHORE(vc_cma_worker_queue_push_mutex);
 214 +
 215 +static u64 vc_cma_dma_mask = DMA_BIT_MASK(32);
 216 +static struct platform_device vc_cma_device = {
 217 +       .name = "vc-cma",
 218 +       .id = 0,
 219 +       .dev = {
 220 +               .dma_mask = &vc_cma_dma_mask,
 221 +               .coherent_dma_mask = DMA_BIT_MASK(32),
 222 +               },
 223 +};
 224 +
 225 +static VCHIQ_INSTANCE_T cma_instance;
 226 +static VCHIQ_SERVICE_HANDLE_T cma_service;
 227 +static VCHIU_QUEUE_T cma_msg_queue;
 228 +static struct task_struct *cma_worker;
 229 +
 230 +static int vc_cma_set_reserve(unsigned int reserve, unsigned int pid);
 231 +static int vc_cma_alloc_chunks(int num_chunks, struct cma_msg *reply);
 232 +static VCHIQ_STATUS_T cma_service_callback(VCHIQ_REASON_T reason,
 233 +                                          VCHIQ_HEADER_T * header,
 234 +                                          VCHIQ_SERVICE_HANDLE_T service,
 235 +                                          void *bulk_userdata);
 236 +static void send_vc_msg(unsigned short type,
 237 +                       unsigned short param1, unsigned short param2);
 238 +static bool send_worker_msg(VCHIQ_HEADER_T * msg);
 239 +
 240 +static int early_vc_cma_mem(char *p)
 241 +{
 242 +       unsigned int new_size;
 243 +       printk(KERN_NOTICE "early_vc_cma_mem(%s)", p);
 244 +       vc_cma_size = memparse(p, &p);
 245 +       vc_cma_initial = vc_cma_size;
 246 +       if (*p == '/')
 247 +               vc_cma_size = memparse(p + 1, &p);
 248 +       if (*p == '@')
 249 +               vc_cma_base = memparse(p + 1, &p);
 250 +
 251 +       new_size = (vc_cma_size - ((-vc_cma_base) & (VC_CMA_CHUNK_SIZE - 1)))
 252 +           & ~(VC_CMA_CHUNK_SIZE - 1);
 253 +       if (new_size > vc_cma_size)
 254 +               vc_cma_size = 0;
 255 +       vc_cma_initial = (vc_cma_initial + VC_CMA_CHUNK_SIZE - 1)
 256 +           & ~(VC_CMA_CHUNK_SIZE - 1);
 257 +       if (vc_cma_initial > vc_cma_size)
 258 +               vc_cma_initial = vc_cma_size;
 259 +       vc_cma_base = (vc_cma_base + VC_CMA_CHUNK_SIZE - 1)
 260 +           & ~(VC_CMA_CHUNK_SIZE - 1);
 261 +
 262 +       printk(KERN_NOTICE " -> initial %x, size %x, base %x", vc_cma_initial,
 263 +              vc_cma_size, (unsigned int)vc_cma_base);
 264 +
 265 +       return 0;
 266 +}
 267 +
 268 +early_param("vc-cma-mem", early_vc_cma_mem);
 269 +
 270 +void vc_cma_early_init(void)
 271 +{
 272 +       LOG_DBG("vc_cma_early_init - vc_cma_chunks = %d", vc_cma_chunks);
 273 +       if (vc_cma_size) {
 274 +               int rc = platform_device_register(&vc_cma_device);
 275 +               LOG_DBG("platform_device_register -> %d", rc);
 276 +       }
 277 +}
 278 +
 279 +void vc_cma_reserve(void)
 280 +{
 281 +       /* if vc_cma_size is set, then declare vc CMA area of the same
 282 +        * size from the end of memory
 283 +        */
 284 +       if (vc_cma_size) {
 285 +               if (dma_declare_contiguous(NULL /*&vc_cma_device.dev*/, vc_cma_size,
 286 +                                          vc_cma_base, 0) == 0) {
 287 +               } else {
 288 +                       LOG_ERR("vc_cma: dma_declare_contiguous(%x,%x) failed",
 289 +                               vc_cma_size, (unsigned int)vc_cma_base);
 290 +                       vc_cma_size = 0;
 291 +               }
 292 +       }
 293 +       vc_cma_chunks = vc_cma_size / VC_CMA_CHUNK_SIZE;
 294 +}
 295 +
 296 +/****************************************************************************
 297 +*
 298 +*   vc_cma_open
 299 +*
 300 +***************************************************************************/
 301 +
 302 +static int vc_cma_open(struct inode *inode, struct file *file)
 303 +{
 304 +       (void)inode;
 305 +       (void)file;
 306 +
 307 +       return 0;
 308 +}
 309 +
 310 +/****************************************************************************
 311 +*
 312 +*   vc_cma_release
 313 +*
 314 +***************************************************************************/
 315 +
 316 +static int vc_cma_release(struct inode *inode, struct file *file)
 317 +{
 318 +       (void)inode;
 319 +       (void)file;
 320 +
 321 +       vc_cma_set_reserve(0, current->tgid);
 322 +
 323 +       return 0;
 324 +}
 325 +
 326 +/****************************************************************************
 327 +*
 328 +*   vc_cma_ioctl
 329 +*
 330 +***************************************************************************/
 331 +
 332 +static long vc_cma_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 333 +{
 334 +       int rc = 0;
 335 +
 336 +       (void)cmd;
 337 +       (void)arg;
 338 +
 339 +       switch (cmd) {
 340 +       case VC_CMA_IOC_RESERVE:
 341 +               rc = vc_cma_set_reserve((unsigned int)arg, current->tgid);
 342 +               if (rc >= 0)
 343 +                       rc = 0;
 344 +               break;
 345 +       default:
 346 +               LOG_ERR("vc-cma: Unknown ioctl %x", cmd);
 347 +               return -ENOTTY;
 348 +       }
 349 +
 350 +       return rc;
 351 +}
 352 +
 353 +/****************************************************************************
 354 +*
 355 +*   File Operations for the driver.
 356 +*
 357 +***************************************************************************/
 358 +
 359 +static const struct file_operations vc_cma_fops = {
 360 +       .owner = THIS_MODULE,
 361 +       .open = vc_cma_open,
 362 +       .release = vc_cma_release,
 363 +       .unlocked_ioctl = vc_cma_ioctl,
 364 +};
 365 +
 366 +/****************************************************************************
 367 +*
 368 +*   vc_cma_proc_open
 369 +*
 370 +***************************************************************************/
 371 +
 372 +static int vc_cma_show_info(struct seq_file *m, void *v)
 373 +{
 374 +       int i;
 375 +
 376 +       seq_printf(m, "Videocore CMA:\n");
 377 +       seq_printf(m, "   Base       : %08x\n", (unsigned int)vc_cma_base);
 378 +       seq_printf(m, "   Length     : %08x\n", vc_cma_size);
 379 +       seq_printf(m, "   Initial    : %08x\n", vc_cma_initial);
 380 +       seq_printf(m, "   Chunk size : %08x\n", VC_CMA_CHUNK_SIZE);
 381 +       seq_printf(m, "   Chunks     : %4d (%d bytes)\n",
 382 +                  (int)vc_cma_chunks,
 383 +                  (int)(vc_cma_chunks * VC_CMA_CHUNK_SIZE));
 384 +       seq_printf(m, "   Used       : %4d (%d bytes)\n",
 385 +                  (int)vc_cma_chunks_used,
 386 +                  (int)(vc_cma_chunks_used * VC_CMA_CHUNK_SIZE));
 387 +       seq_printf(m, "   Reserved   : %4d (%d bytes)\n",
 388 +                  (unsigned int)vc_cma_chunks_reserved,
 389 +                  (int)(vc_cma_chunks_reserved * VC_CMA_CHUNK_SIZE));
 390 +
 391 +       for (i = 0; i < vc_cma_reserve_count; i++) {
 392 +               struct vc_cma_reserve_user *user = &vc_cma_reserve_users[i];
 393 +               seq_printf(m, "     PID %5d: %d bytes\n", user->pid,
 394 +                          user->reserve);
 395 +       }
 396 +
 397 +       seq_printf(m, "\n");
 398 +
 399 +       return 0;
 400 +}
 401 +
 402 +static int vc_cma_proc_open(struct inode *inode, struct file *file)
 403 +{
 404 +       return single_open(file, vc_cma_show_info, NULL);
 405 +}
 406 +
 407 +/****************************************************************************
 408 +*
 409 +*   vc_cma_proc_write
 410 +*
 411 +***************************************************************************/
 412 +
 413 +static int vc_cma_proc_write(struct file *file,
 414 +                            const char __user *buffer,
 415 +                            size_t size, loff_t *ppos)
 416 +{
 417 +       int rc = -EFAULT;
 418 +       char input_str[20];
 419 +
 420 +       memset(input_str, 0, sizeof(input_str));
 421 +
 422 +       if (size > sizeof(input_str)) {
 423 +               LOG_ERR("%s: input string length too long", __func__);
 424 +               goto out;
 425 +       }
 426 +
 427 +       if (copy_from_user(input_str, buffer, size - 1)) {
 428 +               LOG_ERR("%s: failed to get input string", __func__);
 429 +               goto out;
 430 +       }
 431 +#define ALLOC_STR "alloc"
 432 +#define FREE_STR "free"
 433 +#define DEBUG_STR "debug"
 434 +#define RESERVE_STR "reserve"
 435 +       if (strncmp(input_str, ALLOC_STR, strlen(ALLOC_STR)) == 0) {
 436 +               int size;
 437 +               char *p = input_str + strlen(ALLOC_STR);
 438 +
 439 +               while (*p == ' ')
 440 +                       p++;
 441 +               size = memparse(p, NULL);
 442 +               LOG_ERR("/proc/vc-cma: alloc %d", size);
 443 +               if (size)
 444 +                       send_vc_msg(VC_CMA_MSG_REQUEST_FREE,
 445 +                                   size / VC_CMA_CHUNK_SIZE, 0);
 446 +               else
 447 +                       LOG_ERR("invalid size '%s'", p);
 448 +               rc = size;
 449 +       } else if (strncmp(input_str, FREE_STR, strlen(FREE_STR)) == 0) {
 450 +               int size;
 451 +               char *p = input_str + strlen(FREE_STR);
 452 +
 453 +               while (*p == ' ')
 454 +                       p++;
 455 +               size = memparse(p, NULL);
 456 +               LOG_ERR("/proc/vc-cma: free %d", size);
 457 +               if (size)
 458 +                       send_vc_msg(VC_CMA_MSG_REQUEST_ALLOC,
 459 +                                   size / VC_CMA_CHUNK_SIZE, 0);
 460 +               else
 461 +                       LOG_ERR("invalid size '%s'", p);
 462 +               rc = size;
 463 +       } else if (strncmp(input_str, DEBUG_STR, strlen(DEBUG_STR)) == 0) {
 464 +               char *p = input_str + strlen(DEBUG_STR);
 465 +               while (*p == ' ')
 466 +                       p++;
 467 +               if ((strcmp(p, "on") == 0) || (strcmp(p, "1") == 0))
 468 +                       vc_cma_debug = 1;
 469 +               else if ((strcmp(p, "off") == 0) || (strcmp(p, "0") == 0))
 470 +                       vc_cma_debug = 0;
 471 +               LOG_ERR("/proc/vc-cma: debug %s", vc_cma_debug ? "on" : "off");
 472 +               rc = size;
 473 +       } else if (strncmp(input_str, RESERVE_STR, strlen(RESERVE_STR)) == 0) {
 474 +               int size;
 475 +               int reserved;
 476 +               char *p = input_str + strlen(RESERVE_STR);
 477 +               while (*p == ' ')
 478 +                       p++;
 479 +               size = memparse(p, NULL);
 480 +
 481 +               reserved = vc_cma_set_reserve(size, current->tgid);
 482 +               rc = (reserved >= 0) ? size : reserved;
 483 +       }
 484 +
 485 +out:
 486 +       return rc;
 487 +}
 488 +
 489 +/****************************************************************************
 490 +*
 491 +*   File Operations for /proc interface.
 492 +*
 493 +***************************************************************************/
 494 +
 495 +static const struct file_operations vc_cma_proc_fops = {
 496 +       .open = vc_cma_proc_open,
 497 +       .read = seq_read,
 498 +       .write = vc_cma_proc_write,
 499 +       .llseek = seq_lseek,
 500 +       .release = single_release
 501 +};
 502 +
 503 +static int vc_cma_set_reserve(unsigned int reserve, unsigned int pid)
 504 +{
 505 +       struct vc_cma_reserve_user *user = NULL;
 506 +       int delta = 0;
 507 +       int i;
 508 +
 509 +       if (down_interruptible(&vc_cma_reserve_mutex))
 510 +               return -ERESTARTSYS;
 511 +
 512 +       for (i = 0; i < vc_cma_reserve_count; i++) {
 513 +               if (pid == vc_cma_reserve_users[i].pid) {
 514 +                       user = &vc_cma_reserve_users[i];
 515 +                       delta = reserve - user->reserve;
 516 +                       if (reserve)
 517 +                               user->reserve = reserve;
 518 +                       else {
 519 +                               /* Remove this entry by copying downwards */
 520 +                               while ((i + 1) < vc_cma_reserve_count) {
 521 +                                       user[0].pid = user[1].pid;
 522 +                                       user[0].reserve = user[1].reserve;
 523 +                                       user++;
 524 +                                       i++;
 525 +                               }
 526 +                               vc_cma_reserve_count--;
 527 +                               user = NULL;
 528 +                       }
 529 +                       break;
 530 +               }
 531 +       }
 532 +
 533 +       if (reserve && !user) {
 534 +               if (vc_cma_reserve_count == VC_CMA_RESERVE_COUNT_MAX) {
 535 +                       LOG_ERR("vc-cma: Too many reservations - "
 536 +                               "increase CMA_RESERVE_COUNT_MAX");
 537 +                       up(&vc_cma_reserve_mutex);
 538 +                       return -EBUSY;
 539 +               }
 540 +               user = &vc_cma_reserve_users[vc_cma_reserve_count];
 541 +               user->pid = pid;
 542 +               user->reserve = reserve;
 543 +               delta = reserve;
 544 +               vc_cma_reserve_count++;
 545 +       }
 546 +
 547 +       vc_cma_reserve_total += delta;
 548 +
 549 +       send_vc_msg(VC_CMA_MSG_RESERVE,
 550 +                   vc_cma_reserve_total & 0xffff, vc_cma_reserve_total >> 16);
 551 +
 552 +       send_worker_msg((VCHIQ_HEADER_T *) VC_CMA_MSG_UPDATE_RESERVE);
 553 +
 554 +       LOG_DBG("/proc/vc-cma: reserve %d (PID %d) - total %u",
 555 +               reserve, pid, vc_cma_reserve_total);
 556 +
 557 +       up(&vc_cma_reserve_mutex);
 558 +
 559 +       return vc_cma_reserve_total;
 560 +}
 561 +
 562 +static VCHIQ_STATUS_T cma_service_callback(VCHIQ_REASON_T reason,
 563 +                                          VCHIQ_HEADER_T * header,
 564 +                                          VCHIQ_SERVICE_HANDLE_T service,
 565 +                                          void *bulk_userdata)
 566 +{
 567 +       switch (reason) {
 568 +       case VCHIQ_MESSAGE_AVAILABLE:
 569 +               if (!send_worker_msg(header))
 570 +                       return VCHIQ_RETRY;
 571 +               break;
 572 +       case VCHIQ_SERVICE_CLOSED:
 573 +               LOG_DBG("CMA service closed");
 574 +               break;
 575 +       default:
 576 +               LOG_ERR("Unexpected CMA callback reason %d", reason);
 577 +               break;
 578 +       }
 579 +       return VCHIQ_SUCCESS;
 580 +}
 581 +
 582 +static void send_vc_msg(unsigned short type,
 583 +                       unsigned short param1, unsigned short param2)
 584 +{
 585 +       unsigned short msg[] = { type, param1, param2 };
 586 +       VCHIQ_ELEMENT_T elem = { &msg, sizeof(msg) };
 587 +       VCHIQ_STATUS_T ret;
 588 +       vchiq_use_service(cma_service);
 589 +       ret = vchiq_queue_message(cma_service, &elem, 1);
 590 +       vchiq_release_service(cma_service);
 591 +       if (ret != VCHIQ_SUCCESS)
 592 +               LOG_ERR("vchiq_queue_message returned %x", ret);
 593 +}
 594 +
 595 +static bool send_worker_msg(VCHIQ_HEADER_T * msg)
 596 +{
 597 +       if (down_interruptible(&vc_cma_worker_queue_push_mutex))
 598 +               return false;
 599 +       vchiu_queue_push(&cma_msg_queue, msg);
 600 +       up(&vc_cma_worker_queue_push_mutex);
 601 +       return true;
 602 +}
 603 +
 604 +static int vc_cma_alloc_chunks(int num_chunks, struct cma_msg *reply)
 605 +{
 606 +       int i;
 607 +       for (i = 0; i < num_chunks; i++) {
 608 +               struct page *chunk;
 609 +               unsigned int chunk_num;
 610 +               uint8_t *chunk_addr;
 611 +               size_t chunk_size = PAGES_PER_CHUNK << PAGE_SHIFT;
 612 +
 613 +               chunk = dma_alloc_from_contiguous(NULL /*&vc_cma_device.dev*/,
 614 +                                                 PAGES_PER_CHUNK,
 615 +                                                 VC_CMA_CHUNK_ORDER);
 616 +               if (!chunk)
 617 +                       break;
 618 +
 619 +               chunk_addr = page_address(chunk);
 620 +               dmac_flush_range(chunk_addr, chunk_addr + chunk_size);
 621 +               outer_inv_range(__pa(chunk_addr), __pa(chunk_addr) +
 622 +                       chunk_size);
 623 +
 624 +               chunk_num =
 625 +                   (page_to_phys(chunk) - vc_cma_base) / VC_CMA_CHUNK_SIZE;
 626 +               BUG_ON(((page_to_phys(chunk) - vc_cma_base) %
 627 +                       VC_CMA_CHUNK_SIZE) != 0);
 628 +               if (chunk_num >= vc_cma_chunks) {
 629 +                       LOG_ERR("%s: ===============================",
 630 +                               __func__);
 631 +                       LOG_ERR("%s: chunk phys %x, vc_cma %x-%x - "
 632 +                               "bad SPARSEMEM configuration?",
 633 +                               __func__, (unsigned int)page_to_phys(chunk),
 634 +                               vc_cma_base, vc_cma_base + vc_cma_size - 1);
 635 +                       LOG_ERR("%s: dev->cma_area = %p\n", __func__,
 636 +                               (void*)0/*vc_cma_device.dev.cma_area*/);
 637 +                       LOG_ERR("%s: ===============================",
 638 +                               __func__);
 639 +                       break;
 640 +               }
 641 +               reply->params[i] = chunk_num;
 642 +               vc_cma_chunks_used++;
 643 +       }
 644 +
 645 +       if (i < num_chunks) {
 646 +               LOG_ERR("%s: dma_alloc_from_contiguous failed "
 647 +                       "for %x bytes (alloc %d of %d, %d free)",
 648 +                       __func__, VC_CMA_CHUNK_SIZE, i,
 649 +                       num_chunks, vc_cma_chunks - vc_cma_chunks_used);
 650 +               num_chunks = i;
 651 +       }
 652 +
 653 +       LOG_DBG("CMA allocated %d chunks -> %d used",
 654 +               num_chunks, vc_cma_chunks_used);
 655 +       reply->type = VC_CMA_MSG_ALLOCATED;
 656 +
 657 +       {
 658 +               VCHIQ_ELEMENT_T elem = {
 659 +                       reply,
 660 +                       offsetof(struct cma_msg, params[0]) +
 661 +                           num_chunks * sizeof(reply->params[0])
 662 +               };
 663 +               VCHIQ_STATUS_T ret;
 664 +               vchiq_use_service(cma_service);
 665 +               ret = vchiq_queue_message(cma_service, &elem, 1);
 666 +               vchiq_release_service(cma_service);
 667 +               if (ret != VCHIQ_SUCCESS)
 668 +                       LOG_ERR("vchiq_queue_message return " "%x", ret);
 669 +       }
 670 +
 671 +       return num_chunks;
 672 +}
 673 +
 674 +static int cma_worker_proc(void *param)
 675 +{
 676 +       static struct cma_msg reply;
 677 +       (void)param;
 678 +
 679 +       while (1) {
 680 +               VCHIQ_HEADER_T *msg;
 681 +               static struct cma_msg msg_copy;
 682 +               struct cma_msg *cma_msg = &msg_copy;
 683 +               int type, msg_size;
 684 +
 685 +               msg = vchiu_queue_pop(&cma_msg_queue);
 686 +               if ((unsigned int)msg >= VC_CMA_MSG_MAX) {
 687 +                       msg_size = msg->size;
 688 +                       memcpy(&msg_copy, msg->data, msg_size);
 689 +                       type = cma_msg->type;
 690 +                       vchiq_release_message(cma_service, msg);
 691 +               } else {
 692 +                       msg_size = 0;
 693 +                       type = (int)msg;
 694 +                       if (type == VC_CMA_MSG_QUIT)
 695 +                               break;
 696 +                       else if (type == VC_CMA_MSG_UPDATE_RESERVE) {
 697 +                               msg = NULL;
 698 +                               cma_msg = NULL;
 699 +                       } else {
 700 +                               BUG();
 701 +                               continue;
 702 +                       }
 703 +               }
 704 +
 705 +               switch (type) {
 706 +               case VC_CMA_MSG_ALLOC:{
 707 +                               int num_chunks, free_chunks;
 708 +                               num_chunks = cma_msg->params[0];
 709 +                               free_chunks =
 710 +                                   vc_cma_chunks - vc_cma_chunks_used;
 711 +                               LOG_DBG("CMA_MSG_ALLOC(%d chunks)", num_chunks);
 712 +                               if (num_chunks > VC_CMA_MAX_PARAMS_PER_MSG) {
 713 +                                       LOG_ERR
 714 +                                           ("CMA_MSG_ALLOC - chunk count (%d) "
 715 +                                            "exceeds VC_CMA_MAX_PARAMS_PER_MSG (%d)",
 716 +                                            num_chunks,
 717 +                                            VC_CMA_MAX_PARAMS_PER_MSG);
 718 +                                       num_chunks = VC_CMA_MAX_PARAMS_PER_MSG;
 719 +                               }
 720 +
 721 +                               if (num_chunks > free_chunks) {
 722 +                                       LOG_ERR
 723 +                                           ("CMA_MSG_ALLOC - chunk count (%d) "
 724 +                                            "exceeds free chunks (%d)",
 725 +                                            num_chunks, free_chunks);
 726 +                                       num_chunks = free_chunks;
 727 +                               }
 728 +
 729 +                               vc_cma_alloc_chunks(num_chunks, &reply);
 730 +                       }
 731 +                       break;
 732 +
 733 +               case VC_CMA_MSG_FREE:{
 734 +                               int chunk_count =
 735 +                                   (msg_size -
 736 +                                    offsetof(struct cma_msg,
 737 +                                             params)) /
 738 +                                   sizeof(cma_msg->params[0]);
 739 +                               int i;
 740 +                               BUG_ON(chunk_count <= 0);
 741 +
 742 +                               LOG_DBG("CMA_MSG_FREE(%d chunks - %x, ...)",
 743 +                                       chunk_count, cma_msg->params[0]);
 744 +                               for (i = 0; i < chunk_count; i++) {
 745 +                                       int chunk_num = cma_msg->params[i];
 746 +                                       struct page *page = vc_cma_base_page +
 747 +                                           chunk_num * PAGES_PER_CHUNK;
 748 +                                       if (chunk_num >= vc_cma_chunks) {
 749 +                                               LOG_ERR
 750 +                                                   ("CMA_MSG_FREE - chunk %d of %d"
 751 +                                                    " (value %x) exceeds maximum "
 752 +                                                    "(%x)", i, chunk_count,
 753 +                                                    chunk_num,
 754 +                                                    vc_cma_chunks - 1);
 755 +                                               break;
 756 +                                       }
 757 +
 758 +                                       if (!dma_release_from_contiguous
 759 +                                           (NULL /*&vc_cma_device.dev*/, page,
 760 +                                            PAGES_PER_CHUNK)) {
 761 +                                               LOG_ERR
 762 +                                                   ("CMA_MSG_FREE - failed to "
 763 +                                                    "release chunk %d (phys %x, "
 764 +                                                    "page %x)", chunk_num,
 765 +                                                    page_to_phys(page),
 766 +                                                    (unsigned int)page);
 767 +                                       }
 768 +                                       vc_cma_chunks_used--;
 769 +                               }
 770 +                               LOG_DBG("CMA released %d chunks -> %d used",
 771 +                                       i, vc_cma_chunks_used);
 772 +                       }
 773 +                       break;
 774 +
 775 +               case VC_CMA_MSG_UPDATE_RESERVE:{
 776 +                               int chunks_needed =
 777 +                                   ((vc_cma_reserve_total + VC_CMA_CHUNK_SIZE -
 778 +                                     1)
 779 +                                    / VC_CMA_CHUNK_SIZE) -
 780 +                                   vc_cma_chunks_reserved;
 781 +
 782 +                               LOG_DBG
 783 +                                   ("CMA_MSG_UPDATE_RESERVE(%d chunks needed)",
 784 +                                    chunks_needed);
 785 +
 786 +                               /* Cap the reservations to what is available */
 787 +                               if (chunks_needed > 0) {
 788 +                                       if (chunks_needed >
 789 +                                           (vc_cma_chunks -
 790 +                                            vc_cma_chunks_used))
 791 +                                               chunks_needed =
 792 +                                                   (vc_cma_chunks -
 793 +                                                    vc_cma_chunks_used);
 794 +
 795 +                                       chunks_needed =
 796 +                                           vc_cma_alloc_chunks(chunks_needed,
 797 +                                                               &reply);
 798 +                               }
 799 +
 800 +                               LOG_DBG
 801 +                                   ("CMA_MSG_UPDATE_RESERVE(%d chunks allocated)",
 802 +                                    chunks_needed);
 803 +                               vc_cma_chunks_reserved += chunks_needed;
 804 +                       }
 805 +                       break;
 806 +
 807 +               default:
 808 +                       LOG_ERR("unexpected msg type %d", type);
 809 +                       break;
 810 +               }
 811 +       }
 812 +
 813 +       LOG_DBG("quitting...");
 814 +       return 0;
 815 +}
 816 +
 817 +/****************************************************************************
 818 +*
 819 +*   vc_cma_connected_init
 820 +*
 821 +*   This function is called once the videocore has been connected.
 822 +*
 823 +***************************************************************************/
 824 +
 825 +static void vc_cma_connected_init(void)
 826 +{
 827 +       VCHIQ_SERVICE_PARAMS_T service_params;
 828 +
 829 +       LOG_DBG("vc_cma_connected_init");
 830 +
 831 +       if (!vchiu_queue_init(&cma_msg_queue, 16)) {
 832 +               LOG_ERR("could not create CMA msg queue");
 833 +               goto fail_queue;
 834 +       }
 835 +
 836 +       if (vchiq_initialise(&cma_instance) != VCHIQ_SUCCESS)
 837 +               goto fail_vchiq_init;
 838 +
 839 +       vchiq_connect(cma_instance);
 840 +
 841 +       service_params.fourcc = VC_CMA_FOURCC;
 842 +       service_params.callback = cma_service_callback;
 843 +       service_params.userdata = NULL;
 844 +       service_params.version = VC_CMA_VERSION;
 845 +       service_params.version_min = VC_CMA_VERSION;
 846 +
 847 +       if (vchiq_open_service(cma_instance, &service_params,
 848 +                              &cma_service) != VCHIQ_SUCCESS) {
 849 +               LOG_ERR("failed to open service - already in use?");
 850 +               goto fail_vchiq_open;
 851 +       }
 852 +
 853 +       vchiq_release_service(cma_service);
 854 +
 855 +       cma_worker = kthread_create(cma_worker_proc, NULL, "cma_worker");
 856 +       if (!cma_worker) {
 857 +               LOG_ERR("could not create CMA worker thread");
 858 +               goto fail_worker;
 859 +       }
 860 +       set_user_nice(cma_worker, -20);
 861 +       wake_up_process(cma_worker);
 862 +
 863 +       return;
 864 +
 865 +fail_worker:
 866 +       vchiq_close_service(cma_service);
 867 +fail_vchiq_open:
 868 +       vchiq_shutdown(cma_instance);
 869 +fail_vchiq_init:
 870 +       vchiu_queue_delete(&cma_msg_queue);
 871 +fail_queue:
 872 +       return;
 873 +}
 874 +
 875 +void
 876 +loud_error_header(void)
 877 +{
 878 +       if (in_loud_error)
 879 +               return;
 880 +
 881 +       LOG_ERR("============================================================"
 882 +               "================");
 883 +       LOG_ERR("============================================================"
 884 +               "================");
 885 +       LOG_ERR("=====");
 886 +
 887 +       in_loud_error = 1;
 888 +}
 889 +
 890 +void
 891 +loud_error_footer(void)
 892 +{
 893 +       if (!in_loud_error)
 894 +               return;
 895 +
 896 +       LOG_ERR("=====");
 897 +       LOG_ERR("============================================================"
 898 +               "================");
 899 +       LOG_ERR("============================================================"
 900 +               "================");
 901 +
 902 +       in_loud_error = 0;
 903 +}
 904 +
 905 +#if 1
 906 +static int check_cma_config(void) { return 1; }
 907 +#else
 908 +static int
 909 +read_vc_debug_var(VC_MEM_ACCESS_HANDLE_T handle,
 910 +       const char *symbol,
 911 +       void *buf, size_t bufsize)
 912 +{
 913 +       VC_MEM_ADDR_T vcMemAddr;
 914 +       size_t vcMemSize;
 915 +       uint8_t *mapAddr;
 916 +       off_t  vcMapAddr;
 917 +
 918 +       if (!LookupVideoCoreSymbol(handle, symbol,
 919 +               &vcMemAddr,
 920 +               &vcMemSize)) {
 921 +               loud_error_header();
 922 +               loud_error(
 923 +                       "failed to find VC symbol \"%s\".",
 924 +                       symbol);
 925 +               loud_error_footer();
 926 +               return 0;
 927 +       }
 928 +
 929 +       if (vcMemSize != bufsize) {
 930 +               loud_error_header();
 931 +               loud_error(
 932 +                       "VC symbol \"%s\" is the wrong size.",
 933 +                       symbol);
 934 +               loud_error_footer();
 935 +               return 0;
 936 +       }
 937 +
 938 +       vcMapAddr = (off_t)vcMemAddr & VC_MEM_TO_ARM_ADDR_MASK;
 939 +       vcMapAddr += mm_vc_mem_phys_addr;
 940 +       mapAddr = ioremap_nocache(vcMapAddr, vcMemSize);
 941 +       if (mapAddr == 0) {
 942 +               loud_error_header();
 943 +               loud_error(
 944 +                       "failed to ioremap \"%s\" @ 0x%x "
 945 +                       "(phys: 0x%x, size: %u).",
 946 +                       symbol,
 947 +                       (unsigned int)vcMapAddr,
 948 +                       (unsigned int)vcMemAddr,
 949 +                       (unsigned int)vcMemSize);
 950 +               loud_error_footer();
 951 +               return 0;
 952 +       }
 953 +
 954 +       memcpy(buf, mapAddr, bufsize);
 955 +       iounmap(mapAddr);
 956 +
 957 +       return 1;
 958 +}
 959 +
 960 +
 961 +static int
 962 +check_cma_config(void)
 963 +{
 964 +       VC_MEM_ACCESS_HANDLE_T mem_hndl;
 965 +       VC_MEM_ADDR_T mempool_start;
 966 +       VC_MEM_ADDR_T mempool_end;
 967 +       VC_MEM_ADDR_T mempool_offline_start;
 968 +       VC_MEM_ADDR_T mempool_offline_end;
 969 +       VC_MEM_ADDR_T cam_alloc_base;
 970 +       VC_MEM_ADDR_T cam_alloc_size;
 971 +       VC_MEM_ADDR_T cam_alloc_end;
 972 +       int success = 0;
 973 +
 974 +       if (OpenVideoCoreMemory(&mem_hndl) != 0)
 975 +               goto out;
 976 +
 977 +       /* Read the relevant VideoCore variables */
 978 +       if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_START",
 979 +               &mempool_start,
 980 +               sizeof(mempool_start)))
 981 +               goto close;
 982 +
 983 +       if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_END",
 984 +               &mempool_end,
 985 +               sizeof(mempool_end)))
 986 +               goto close;
 987 +
 988 +       if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_OFFLINE_START",
 989 +               &mempool_offline_start,
 990 +               sizeof(mempool_offline_start)))
 991 +               goto close;
 992 +
 993 +       if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_OFFLINE_END",
 994 +               &mempool_offline_end,
 995 +               sizeof(mempool_offline_end)))
 996 +               goto close;
 997 +
 998 +       if (!read_vc_debug_var(mem_hndl, "cam_alloc_base",
 999 +               &cam_alloc_base,
1000 +               sizeof(cam_alloc_base)))
1001 +               goto close;
1002 +
1003 +       if (!read_vc_debug_var(mem_hndl, "cam_alloc_size",
1004 +               &cam_alloc_size,
1005 +               sizeof(cam_alloc_size)))
1006 +               goto close;
1007 +
1008 +       cam_alloc_end = cam_alloc_base + cam_alloc_size;
1009 +
1010 +       success = 1;
1011 +
1012 +       /* Now the sanity checks */
1013 +       if (!mempool_offline_start)
1014 +               mempool_offline_start = mempool_start;
1015 +       if (!mempool_offline_end)
1016 +               mempool_offline_end = mempool_end;
1017 +
1018 +       if (VCADDR_TO_PHYSADDR(mempool_offline_start) != vc_cma_base) {
1019 +               loud_error_header();
1020 +               loud_error(
1021 +                       "__MEMPOOL_OFFLINE_START(%x -> %lx) doesn't match "
1022 +                       "vc_cma_base(%x)",
1023 +                       mempool_offline_start,
1024 +                       VCADDR_TO_PHYSADDR(mempool_offline_start),
1025 +                       vc_cma_base);
1026 +               success = 0;
1027 +       }
1028 +
1029 +       if (VCADDR_TO_PHYSADDR(mempool_offline_end) !=
1030 +               (vc_cma_base + vc_cma_size)) {
1031 +               loud_error_header();
1032 +               loud_error(
1033 +                       "__MEMPOOL_OFFLINE_END(%x -> %lx) doesn't match "
1034 +                       "vc_cma_base(%x) + vc_cma_size(%x) = %x",
1035 +                       mempool_offline_start,
1036 +                       VCADDR_TO_PHYSADDR(mempool_offline_end),
1037 +                       vc_cma_base, vc_cma_size, vc_cma_base + vc_cma_size);
1038 +               success = 0;
1039 +       }
1040 +
1041 +       if (mempool_end < mempool_start) {
1042 +               loud_error_header();
1043 +               loud_error(
1044 +                       "__MEMPOOL_END(%x) must not be before "
1045 +                       "__MEMPOOL_START(%x)",
1046 +                       mempool_end,
1047 +                       mempool_start);
1048 +               success = 0;
1049 +       }
1050 +
1051 +       if (mempool_offline_end < mempool_offline_start) {
1052 +               loud_error_header();
1053 +               loud_error(
1054 +                       "__MEMPOOL_OFFLINE_END(%x) must not be before "
1055 +                       "__MEMPOOL_OFFLINE_START(%x)",
1056 +                       mempool_offline_end,
1057 +                       mempool_offline_start);
1058 +               success = 0;
1059 +       }
1060 +
1061 +       if (mempool_offline_start < mempool_start) {
1062 +               loud_error_header();
1063 +               loud_error(
1064 +                       "__MEMPOOL_OFFLINE_START(%x) must not be before "
1065 +                       "__MEMPOOL_START(%x)",
1066 +                       mempool_offline_start,
1067 +                       mempool_start);
1068 +               success = 0;
1069 +       }
1070 +
1071 +       if (mempool_offline_end > mempool_end) {
1072 +               loud_error_header();
1073 +               loud_error(
1074 +                       "__MEMPOOL_OFFLINE_END(%x) must not be after "
1075 +                       "__MEMPOOL_END(%x)",
1076 +                       mempool_offline_end,
1077 +                       mempool_end);
1078 +               success = 0;
1079 +       }
1080 +
1081 +       if ((cam_alloc_base < mempool_end) &&
1082 +               (cam_alloc_end > mempool_start)) {
1083 +               loud_error_header();
1084 +               loud_error(
1085 +                       "cam_alloc pool(%x-%x) overlaps "
1086 +                       "mempool(%x-%x)",
1087 +                       cam_alloc_base, cam_alloc_end,
1088 +                       mempool_start, mempool_end);
1089 +               success = 0;
1090 +       }
1091 +
1092 +       loud_error_footer();
1093 +
1094 +close:
1095 +       CloseVideoCoreMemory(mem_hndl);
1096 +
1097 +out:
1098 +       return success;
1099 +}
1100 +#endif
1101 +
1102 +static int vc_cma_init(void)
1103 +{
1104 +       int rc = -EFAULT;
1105 +       struct device *dev;
1106 +
1107 +       if (!check_cma_config())
1108 +               goto out_release;
1109 +
1110 +       printk(KERN_INFO "vc-cma: Videocore CMA driver\n");
1111 +       printk(KERN_INFO "vc-cma: vc_cma_base      = 0x%08x\n", vc_cma_base);
1112 +       printk(KERN_INFO "vc-cma: vc_cma_size      = 0x%08x (%u MiB)\n",
1113 +              vc_cma_size, vc_cma_size / (1024 * 1024));
1114 +       printk(KERN_INFO "vc-cma: vc_cma_initial   = 0x%08x (%u MiB)\n",
1115 +              vc_cma_initial, vc_cma_initial / (1024 * 1024));
1116 +
1117 +       vc_cma_base_page = phys_to_page(vc_cma_base);
1118 +
1119 +       if (vc_cma_chunks) {
1120 +               int chunks_needed = vc_cma_initial / VC_CMA_CHUNK_SIZE;
1121 +
1122 +               for (vc_cma_chunks_used = 0;
1123 +                    vc_cma_chunks_used < chunks_needed; vc_cma_chunks_used++) {
1124 +                       struct page *chunk;
1125 +                       chunk = dma_alloc_from_contiguous(NULL /*&vc_cma_device.dev*/,
1126 +                                                         PAGES_PER_CHUNK,
1127 +                                                         VC_CMA_CHUNK_ORDER);
1128 +                       if (!chunk)
1129 +                               break;
1130 +                       BUG_ON(((page_to_phys(chunk) - vc_cma_base) %
1131 +                               VC_CMA_CHUNK_SIZE) != 0);
1132 +               }
1133 +               if (vc_cma_chunks_used != chunks_needed) {
1134 +                       LOG_ERR("%s: dma_alloc_from_contiguous failed (%d "
1135 +                               "bytes, allocation %d of %d)",
1136 +                               __func__, VC_CMA_CHUNK_SIZE,
1137 +                               vc_cma_chunks_used, chunks_needed);
1138 +                       goto out_release;
1139 +               }
1140 +
1141 +               vchiq_add_connected_callback(vc_cma_connected_init);
1142 +       }
1143 +
1144 +       rc = alloc_chrdev_region(&vc_cma_devnum, 0, 1, DRIVER_NAME);
1145 +       if (rc < 0) {
1146 +               LOG_ERR("%s: alloc_chrdev_region failed (rc=%d)", __func__, rc);
1147 +               goto out_release;
1148 +       }
1149 +
1150 +       cdev_init(&vc_cma_cdev, &vc_cma_fops);
1151 +       rc = cdev_add(&vc_cma_cdev, vc_cma_devnum, 1);
1152 +       if (rc != 0) {
1153 +               LOG_ERR("%s: cdev_add failed (rc=%d)", __func__, rc);
1154 +               goto out_unregister;
1155 +       }
1156 +
1157 +       vc_cma_class = class_create(THIS_MODULE, DRIVER_NAME);
1158 +       if (IS_ERR(vc_cma_class)) {
1159 +               rc = PTR_ERR(vc_cma_class);
1160 +               LOG_ERR("%s: class_create failed (rc=%d)", __func__, rc);
1161 +               goto out_cdev_del;
1162 +       }
1163 +
1164 +       dev = device_create(vc_cma_class, NULL, vc_cma_devnum, NULL,
1165 +                           DRIVER_NAME);
1166 +       if (IS_ERR(dev)) {
1167 +               rc = PTR_ERR(dev);
1168 +               LOG_ERR("%s: device_create failed (rc=%d)", __func__, rc);
1169 +               goto out_class_destroy;
1170 +       }
1171 +
1172 +       vc_cma_proc_entry = proc_create(DRIVER_NAME, 0444, NULL, &vc_cma_proc_fops);
1173 +       if (vc_cma_proc_entry == NULL) {
1174 +               rc = -EFAULT;
1175 +               LOG_ERR("%s: proc_create failed", __func__);
1176 +               goto out_device_destroy;
1177 +       }
1178 +
1179 +       vc_cma_inited = 1;
1180 +       return 0;
1181 +
1182 +out_device_destroy:
1183 +       device_destroy(vc_cma_class, vc_cma_devnum);
1184 +
1185 +out_class_destroy:
1186 +       class_destroy(vc_cma_class);
1187 +       vc_cma_class = NULL;
1188 +
1189 +out_cdev_del:
1190 +       cdev_del(&vc_cma_cdev);
1191 +
1192 +out_unregister:
1193 +       unregister_chrdev_region(vc_cma_devnum, 1);
1194 +
1195 +out_release:
1196 +       /* It is tempting to try to clean up by calling
1197 +          dma_release_from_contiguous for all allocated chunks, but it isn't
1198 +          a very safe thing to do. If vc_cma_initial is non-zero it is because
1199 +          VideoCore is already using that memory, so giving it back to Linux
1200 +          is likely to be fatal.
1201 +        */
1202 +       return -1;
1203 +}
1204 +
1205 +/****************************************************************************
1206 +*
1207 +*   vc_cma_exit
1208 +*
1209 +***************************************************************************/
1210 +
1211 +static void __exit vc_cma_exit(void)
1212 +{
1213 +       LOG_DBG("%s: called", __func__);
1214 +
1215 +       if (vc_cma_inited) {
1216 +               remove_proc_entry(DRIVER_NAME, NULL);
1217 +               device_destroy(vc_cma_class, vc_cma_devnum);
1218 +               class_destroy(vc_cma_class);
1219 +               cdev_del(&vc_cma_cdev);
1220 +               unregister_chrdev_region(vc_cma_devnum, 1);
1221 +       }
1222 +}
1223 +
1224 +module_init(vc_cma_init);
1225 +module_exit(vc_cma_exit);
1226 +MODULE_LICENSE("GPL");
1227 +MODULE_AUTHOR("Broadcom Corporation");
1228 --- a/drivers/misc/Makefile
1229 +++ b/drivers/misc/Makefile
1230 @@ -52,6 +52,6 @@ obj-$(CONFIG_INTEL_MEI)               += mei/
1231  obj-$(CONFIG_VMWARE_VMCI)      += vmw_vmci/
1232  obj-$(CONFIG_LATTICE_ECP3_CONFIG)      += lattice-ecp3-config.o
1233  obj-$(CONFIG_SRAM)             += sram.o
1234 -obj-y                          += vc04_services/
1235 +obj-$(CONFIG_BCM2708_VCHIQ)    += vc04_services/
1236  obj-y                          += mic/
1237  obj-$(CONFIG_GENWQE)           += genwqe/
1238 --- /dev/null
1239 +++ b/include/linux/broadcom/vc_cma.h
1240 @@ -0,0 +1,29 @@
1241 +/*****************************************************************************
1242 +* Copyright 2012 Broadcom Corporation.  All rights reserved.
1243 +*
1244 +* Unless you and Broadcom execute a separate written software license
1245 +* agreement governing use of this software, this software is licensed to you
1246 +* under the terms of the GNU General Public License version 2, available at
1247 +* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
1248 +*
1249 +* Notwithstanding the above, under no circumstances may you combine this
1250 +* software in any way with any other Broadcom software provided under a
1251 +* license other than the GPL, without Broadcom's express prior written
1252 +* consent.
1253 +*****************************************************************************/
1254 +
1255 +#if !defined( VC_CMA_H )
1256 +#define VC_CMA_H
1257 +
1258 +#include <linux/ioctl.h>
1259 +
1260 +#define VC_CMA_IOC_MAGIC 0xc5
1261 +
1262 +#define VC_CMA_IOC_RESERVE _IO(VC_CMA_IOC_MAGIC, 0)
1263 +
1264 +#ifdef __KERNEL__
1265 +extern void __init vc_cma_early_init(void);
1266 +extern void __init vc_cma_reserve(void);
1267 +#endif
1268 +
1269 +#endif /* VC_CMA_H */