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 diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
  24 index 1386749..fcf51a3 100644
  25 --- a/drivers/char/Kconfig
  26 +++ b/drivers/char/Kconfig
  27 @@ -581,6 +581,8 @@ config DEVPORT
  28
  29  source "drivers/s390/char/Kconfig"
  30
  31 +source "drivers/char/broadcom/Kconfig"
  32 +
  33  config MSM_SMD_PKT
  34         bool "Enable device interface for some SMD packet ports"
  35         default n
  36 diff --git a/drivers/char/Makefile b/drivers/char/Makefile
  37 index a324f93..aef3ed0 100644
  38 --- a/drivers/char/Makefile
  39 +++ b/drivers/char/Makefile
  40 @@ -61,3 +61,5 @@ obj-$(CONFIG_JS_RTC)          += js-rtc.o
  41  js-rtc-y = rtc.o
  42
  43  obj-$(CONFIG_TILE_SROM)                += tile-srom.o
  44 +
  45 +obj-$(CONFIG_BRCM_CHAR_DRIVERS) += broadcom/
  46 diff --git a/drivers/char/broadcom/Kconfig b/drivers/char/broadcom/Kconfig
  47 new file mode 100644
  48 index 0000000..f089943
  49 --- /dev/null
  50 +++ b/drivers/char/broadcom/Kconfig
  51 @@ -0,0 +1,16 @@
  52 +#
  53 +# Broadcom char driver config
  54 +#
  55 +
  56 +menuconfig BRCM_CHAR_DRIVERS
  57 +       bool "Broadcom Char Drivers"
  58 +       help
  59 +         Broadcom's char drivers
  60 +
  61 +config BCM_VC_CMA
  62 +       bool "Videocore CMA"
  63 +       depends on CMA && BRCM_CHAR_DRIVERS && BCM2708_VCHIQ
  64 +       default n
  65 +        help
  66 +          Helper for videocore CMA access.
  67 +
  68 diff --git a/drivers/char/broadcom/Makefile b/drivers/char/broadcom/Makefile
  69 new file mode 100644
  70 index 0000000..13c5bca
  71 --- /dev/null
  72 +++ b/drivers/char/broadcom/Makefile
  73 @@ -0,0 +1 @@
  74 +obj-$(CONFIG_BCM_VC_CMA)       += vc_cma/
  75 diff --git a/drivers/char/broadcom/vc_cma/Makefile b/drivers/char/broadcom/vc_cma/Makefile
  76 new file mode 100644
  77 index 0000000..6a94de4
  78 --- /dev/null
  79 +++ b/drivers/char/broadcom/vc_cma/Makefile
  80 @@ -0,0 +1,14 @@
  81 +ccflags-y  += -Wall -Wstrict-prototypes -Wno-trigraphs
  82 +ccflags-y  += -Werror
  83 +ccflags-y  += -Iinclude/linux/broadcom
  84 +ccflags-y  += -Idrivers/misc/vc04_services
  85 +ccflags-y  += -Idrivers/misc/vc04_services/interface/vchi
  86 +ccflags-y  += -Idrivers/misc/vc04_services/interface/vchiq_arm
  87 +
  88 +ccflags-y  += -D__KERNEL__
  89 +ccflags-y  += -D__linux__
  90 +ccflags-y  += -Werror
  91 +
  92 +obj-$(CONFIG_BCM_VC_CMA) += vc-cma.o
  93 +
  94 +vc-cma-objs := vc_cma.o
  95 diff --git a/drivers/char/broadcom/vc_cma/vc_cma.c b/drivers/char/broadcom/vc_cma/vc_cma.c
  96 new file mode 100644
  97 index 0000000..a635f9f
  98 --- /dev/null
  99 +++ b/drivers/char/broadcom/vc_cma/vc_cma.c
 100 @@ -0,0 +1,1143 @@
 101 +/**
 102 + * Copyright (c) 2010-2012 Broadcom. All rights reserved.
 103 + *
 104 + * Redistribution and use in source and binary forms, with or without
 105 + * modification, are permitted provided that the following conditions
 106 + * are met:
 107 + * 1. Redistributions of source code must retain the above copyright
 108 + *    notice, this list of conditions, and the following disclaimer,
 109 + *    without modification.
 110 + * 2. Redistributions in binary form must reproduce the above copyright
 111 + *    notice, this list of conditions and the following disclaimer in the
 112 + *    documentation and/or other materials provided with the distribution.
 113 + * 3. The names of the above-listed copyright holders may not be used
 114 + *    to endorse or promote products derived from this software without
 115 + *    specific prior written permission.
 116 + *
 117 + * ALTERNATIVELY, this software may be distributed under the terms of the
 118 + * GNU General Public License ("GPL") version 2, as published by the Free
 119 + * Software Foundation.
 120 + *
 121 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 122 + * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 123 + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 124 + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 125 + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 126 + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 127 + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 128 + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 129 + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 130 + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 131 + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 132 + */
 133 +
 134 +#include <linux/kernel.h>
 135 +#include <linux/module.h>
 136 +#include <linux/kthread.h>
 137 +#include <linux/fs.h>
 138 +#include <linux/device.h>
 139 +#include <linux/cdev.h>
 140 +#include <linux/mm.h>
 141 +#include <linux/proc_fs.h>
 142 +#include <linux/seq_file.h>
 143 +#include <linux/dma-mapping.h>
 144 +#include <linux/dma-contiguous.h>
 145 +#include <linux/platform_device.h>
 146 +#include <linux/uaccess.h>
 147 +#include <asm/cacheflush.h>
 148 +
 149 +#include "vc_cma.h"
 150 +
 151 +#include "vchiq_util.h"
 152 +#include "vchiq_connected.h"
 153 +//#include "debug_sym.h"
 154 +//#include "vc_mem.h"
 155 +
 156 +#define DRIVER_NAME  "vc-cma"
 157 +
 158 +#define LOG_DBG(fmt, ...) \
 159 +       if (vc_cma_debug) \
 160 +               printk(KERN_INFO fmt "\n", ##__VA_ARGS__)
 161 +#define LOG_ERR(fmt, ...) \
 162 +       printk(KERN_ERR fmt "\n", ##__VA_ARGS__)
 163 +
 164 +#define VC_CMA_FOURCC VCHIQ_MAKE_FOURCC('C', 'M', 'A', ' ')
 165 +#define VC_CMA_VERSION 2
 166 +
 167 +#define VC_CMA_CHUNK_ORDER 6   /* 256K */
 168 +#define VC_CMA_CHUNK_SIZE (4096 << VC_CMA_CHUNK_ORDER)
 169 +#define VC_CMA_MAX_PARAMS_PER_MSG \
 170 +       ((VCHIQ_MAX_MSG_SIZE - sizeof(unsigned short))/sizeof(unsigned short))
 171 +#define VC_CMA_RESERVE_COUNT_MAX 16
 172 +
 173 +#define PAGES_PER_CHUNK (VC_CMA_CHUNK_SIZE / PAGE_SIZE)
 174 +
 175 +#define VCADDR_TO_PHYSADDR(vcaddr) (mm_vc_mem_phys_addr + vcaddr)
 176 +
 177 +#define loud_error(...) \
 178 +       LOG_ERR("===== " __VA_ARGS__)
 179 +
 180 +enum {
 181 +       VC_CMA_MSG_QUIT,
 182 +       VC_CMA_MSG_OPEN,
 183 +       VC_CMA_MSG_TICK,
 184 +       VC_CMA_MSG_ALLOC,       /* chunk count */
 185 +       VC_CMA_MSG_FREE,        /* chunk, chunk, ... */
 186 +       VC_CMA_MSG_ALLOCATED,   /* chunk, chunk, ... */
 187 +       VC_CMA_MSG_REQUEST_ALLOC,       /* chunk count */
 188 +       VC_CMA_MSG_REQUEST_FREE,        /* chunk count */
 189 +       VC_CMA_MSG_RESERVE,     /* bytes lo, bytes hi */
 190 +       VC_CMA_MSG_UPDATE_RESERVE,
 191 +       VC_CMA_MSG_MAX
 192 +};
 193 +
 194 +struct cma_msg {
 195 +       unsigned short type;
 196 +       unsigned short params[VC_CMA_MAX_PARAMS_PER_MSG];
 197 +};
 198 +
 199 +struct vc_cma_reserve_user {
 200 +       unsigned int pid;
 201 +       unsigned int reserve;
 202 +};
 203 +
 204 +/* Device (/dev) related variables */
 205 +static dev_t vc_cma_devnum;
 206 +static struct class *vc_cma_class;
 207 +static struct cdev vc_cma_cdev;
 208 +static int vc_cma_inited;
 209 +static int vc_cma_debug;
 210 +
 211 +/* Proc entry */
 212 +static struct proc_dir_entry *vc_cma_proc_entry;
 213 +
 214 +phys_addr_t vc_cma_base;
 215 +struct page *vc_cma_base_page;
 216 +unsigned int vc_cma_size;
 217 +EXPORT_SYMBOL(vc_cma_size);
 218 +unsigned int vc_cma_initial;
 219 +unsigned int vc_cma_chunks;
 220 +unsigned int vc_cma_chunks_used;
 221 +unsigned int vc_cma_chunks_reserved;
 222 +
 223 +static int in_loud_error;
 224 +
 225 +unsigned int vc_cma_reserve_total;
 226 +unsigned int vc_cma_reserve_count;
 227 +struct vc_cma_reserve_user vc_cma_reserve_users[VC_CMA_RESERVE_COUNT_MAX];
 228 +static DEFINE_SEMAPHORE(vc_cma_reserve_mutex);
 229 +static DEFINE_SEMAPHORE(vc_cma_worker_queue_push_mutex);
 230 +
 231 +static u64 vc_cma_dma_mask = DMA_BIT_MASK(32);
 232 +static struct platform_device vc_cma_device = {
 233 +       .name = "vc-cma",
 234 +       .id = 0,
 235 +       .dev = {
 236 +               .dma_mask = &vc_cma_dma_mask,
 237 +               .coherent_dma_mask = DMA_BIT_MASK(32),
 238 +               },
 239 +};
 240 +
 241 +static VCHIQ_INSTANCE_T cma_instance;
 242 +static VCHIQ_SERVICE_HANDLE_T cma_service;
 243 +static VCHIU_QUEUE_T cma_msg_queue;
 244 +static struct task_struct *cma_worker;
 245 +
 246 +static int vc_cma_set_reserve(unsigned int reserve, unsigned int pid);
 247 +static int vc_cma_alloc_chunks(int num_chunks, struct cma_msg *reply);
 248 +static VCHIQ_STATUS_T cma_service_callback(VCHIQ_REASON_T reason,
 249 +                                          VCHIQ_HEADER_T * header,
 250 +                                          VCHIQ_SERVICE_HANDLE_T service,
 251 +                                          void *bulk_userdata);
 252 +static void send_vc_msg(unsigned short type,
 253 +                       unsigned short param1, unsigned short param2);
 254 +static bool send_worker_msg(VCHIQ_HEADER_T * msg);
 255 +
 256 +static int early_vc_cma_mem(char *p)
 257 +{
 258 +       unsigned int new_size;
 259 +       printk(KERN_NOTICE "early_vc_cma_mem(%s)", p);
 260 +       vc_cma_size = memparse(p, &p);
 261 +       vc_cma_initial = vc_cma_size;
 262 +       if (*p == '/')
 263 +               vc_cma_size = memparse(p + 1, &p);
 264 +       if (*p == '@')
 265 +               vc_cma_base = memparse(p + 1, &p);
 266 +
 267 +       new_size = (vc_cma_size - ((-vc_cma_base) & (VC_CMA_CHUNK_SIZE - 1)))
 268 +           & ~(VC_CMA_CHUNK_SIZE - 1);
 269 +       if (new_size > vc_cma_size)
 270 +               vc_cma_size = 0;
 271 +       vc_cma_initial = (vc_cma_initial + VC_CMA_CHUNK_SIZE - 1)
 272 +           & ~(VC_CMA_CHUNK_SIZE - 1);
 273 +       if (vc_cma_initial > vc_cma_size)
 274 +               vc_cma_initial = vc_cma_size;
 275 +       vc_cma_base = (vc_cma_base + VC_CMA_CHUNK_SIZE - 1)
 276 +           & ~(VC_CMA_CHUNK_SIZE - 1);
 277 +
 278 +       printk(KERN_NOTICE " -> initial %x, size %x, base %x", vc_cma_initial,
 279 +              vc_cma_size, (unsigned int)vc_cma_base);
 280 +
 281 +       return 0;
 282 +}
 283 +
 284 +early_param("vc-cma-mem", early_vc_cma_mem);
 285 +
 286 +void vc_cma_early_init(void)
 287 +{
 288 +       LOG_DBG("vc_cma_early_init - vc_cma_chunks = %d", vc_cma_chunks);
 289 +       if (vc_cma_size) {
 290 +               int rc = platform_device_register(&vc_cma_device);
 291 +               LOG_DBG("platform_device_register -> %d", rc);
 292 +       }
 293 +}
 294 +
 295 +void vc_cma_reserve(void)
 296 +{
 297 +       /* if vc_cma_size is set, then declare vc CMA area of the same
 298 +        * size from the end of memory
 299 +        */
 300 +       if (vc_cma_size) {
 301 +               if (dma_declare_contiguous(NULL /*&vc_cma_device.dev*/, vc_cma_size,
 302 +                                          vc_cma_base, 0) == 0) {
 303 +               } else {
 304 +                       LOG_ERR("vc_cma: dma_declare_contiguous(%x,%x) failed",
 305 +                               vc_cma_size, (unsigned int)vc_cma_base);
 306 +                       vc_cma_size = 0;
 307 +               }
 308 +       }
 309 +       vc_cma_chunks = vc_cma_size / VC_CMA_CHUNK_SIZE;
 310 +}
 311 +
 312 +/****************************************************************************
 313 +*
 314 +*   vc_cma_open
 315 +*
 316 +***************************************************************************/
 317 +
 318 +static int vc_cma_open(struct inode *inode, struct file *file)
 319 +{
 320 +       (void)inode;
 321 +       (void)file;
 322 +
 323 +       return 0;
 324 +}
 325 +
 326 +/****************************************************************************
 327 +*
 328 +*   vc_cma_release
 329 +*
 330 +***************************************************************************/
 331 +
 332 +static int vc_cma_release(struct inode *inode, struct file *file)
 333 +{
 334 +       (void)inode;
 335 +       (void)file;
 336 +
 337 +       vc_cma_set_reserve(0, current->tgid);
 338 +
 339 +       return 0;
 340 +}
 341 +
 342 +/****************************************************************************
 343 +*
 344 +*   vc_cma_ioctl
 345 +*
 346 +***************************************************************************/
 347 +
 348 +static long vc_cma_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 349 +{
 350 +       int rc = 0;
 351 +
 352 +       (void)cmd;
 353 +       (void)arg;
 354 +
 355 +       switch (cmd) {
 356 +       case VC_CMA_IOC_RESERVE:
 357 +               rc = vc_cma_set_reserve((unsigned int)arg, current->tgid);
 358 +               if (rc >= 0)
 359 +                       rc = 0;
 360 +               break;
 361 +       default:
 362 +               LOG_ERR("vc-cma: Unknown ioctl %x", cmd);
 363 +               return -ENOTTY;
 364 +       }
 365 +
 366 +       return rc;
 367 +}
 368 +
 369 +/****************************************************************************
 370 +*
 371 +*   File Operations for the driver.
 372 +*
 373 +***************************************************************************/
 374 +
 375 +static const struct file_operations vc_cma_fops = {
 376 +       .owner = THIS_MODULE,
 377 +       .open = vc_cma_open,
 378 +       .release = vc_cma_release,
 379 +       .unlocked_ioctl = vc_cma_ioctl,
 380 +};
 381 +
 382 +/****************************************************************************
 383 +*
 384 +*   vc_cma_proc_open
 385 +*
 386 +***************************************************************************/
 387 +
 388 +static int vc_cma_show_info(struct seq_file *m, void *v)
 389 +{
 390 +       int i;
 391 +
 392 +       seq_printf(m, "Videocore CMA:\n");
 393 +       seq_printf(m, "   Base       : %08x\n", (unsigned int)vc_cma_base);
 394 +       seq_printf(m, "   Length     : %08x\n", vc_cma_size);
 395 +       seq_printf(m, "   Initial    : %08x\n", vc_cma_initial);
 396 +       seq_printf(m, "   Chunk size : %08x\n", VC_CMA_CHUNK_SIZE);
 397 +       seq_printf(m, "   Chunks     : %4d (%d bytes)\n",
 398 +                  (int)vc_cma_chunks,
 399 +                  (int)(vc_cma_chunks * VC_CMA_CHUNK_SIZE));
 400 +       seq_printf(m, "   Used       : %4d (%d bytes)\n",
 401 +                  (int)vc_cma_chunks_used,
 402 +                  (int)(vc_cma_chunks_used * VC_CMA_CHUNK_SIZE));
 403 +       seq_printf(m, "   Reserved   : %4d (%d bytes)\n",
 404 +                  (unsigned int)vc_cma_chunks_reserved,
 405 +                  (int)(vc_cma_chunks_reserved * VC_CMA_CHUNK_SIZE));
 406 +
 407 +       for (i = 0; i < vc_cma_reserve_count; i++) {
 408 +               struct vc_cma_reserve_user *user = &vc_cma_reserve_users[i];
 409 +               seq_printf(m, "     PID %5d: %d bytes\n", user->pid,
 410 +                          user->reserve);
 411 +       }
 412 +
 413 +       seq_printf(m, "\n");
 414 +
 415 +       return 0;
 416 +}
 417 +
 418 +static int vc_cma_proc_open(struct inode *inode, struct file *file)
 419 +{
 420 +       return single_open(file, vc_cma_show_info, NULL);
 421 +}
 422 +
 423 +/****************************************************************************
 424 +*
 425 +*   vc_cma_proc_write
 426 +*
 427 +***************************************************************************/
 428 +
 429 +static int vc_cma_proc_write(struct file *file,
 430 +                            const char __user *buffer,
 431 +                            size_t size, loff_t *ppos)
 432 +{
 433 +       int rc = -EFAULT;
 434 +       char input_str[20];
 435 +
 436 +       memset(input_str, 0, sizeof(input_str));
 437 +
 438 +       if (size > sizeof(input_str)) {
 439 +               LOG_ERR("%s: input string length too long", __func__);
 440 +               goto out;
 441 +       }
 442 +
 443 +       if (copy_from_user(input_str, buffer, size - 1)) {
 444 +               LOG_ERR("%s: failed to get input string", __func__);
 445 +               goto out;
 446 +       }
 447 +#define ALLOC_STR "alloc"
 448 +#define FREE_STR "free"
 449 +#define DEBUG_STR "debug"
 450 +#define RESERVE_STR "reserve"
 451 +       if (strncmp(input_str, ALLOC_STR, strlen(ALLOC_STR)) == 0) {
 452 +               int size;
 453 +               char *p = input_str + strlen(ALLOC_STR);
 454 +
 455 +               while (*p == ' ')
 456 +                       p++;
 457 +               size = memparse(p, NULL);
 458 +               LOG_ERR("/proc/vc-cma: alloc %d", size);
 459 +               if (size)
 460 +                       send_vc_msg(VC_CMA_MSG_REQUEST_FREE,
 461 +                                   size / VC_CMA_CHUNK_SIZE, 0);
 462 +               else
 463 +                       LOG_ERR("invalid size '%s'", p);
 464 +               rc = size;
 465 +       } else if (strncmp(input_str, FREE_STR, strlen(FREE_STR)) == 0) {
 466 +               int size;
 467 +               char *p = input_str + strlen(FREE_STR);
 468 +
 469 +               while (*p == ' ')
 470 +                       p++;
 471 +               size = memparse(p, NULL);
 472 +               LOG_ERR("/proc/vc-cma: free %d", size);
 473 +               if (size)
 474 +                       send_vc_msg(VC_CMA_MSG_REQUEST_ALLOC,
 475 +                                   size / VC_CMA_CHUNK_SIZE, 0);
 476 +               else
 477 +                       LOG_ERR("invalid size '%s'", p);
 478 +               rc = size;
 479 +       } else if (strncmp(input_str, DEBUG_STR, strlen(DEBUG_STR)) == 0) {
 480 +               char *p = input_str + strlen(DEBUG_STR);
 481 +               while (*p == ' ')
 482 +                       p++;
 483 +               if ((strcmp(p, "on") == 0) || (strcmp(p, "1") == 0))
 484 +                       vc_cma_debug = 1;
 485 +               else if ((strcmp(p, "off") == 0) || (strcmp(p, "0") == 0))
 486 +                       vc_cma_debug = 0;
 487 +               LOG_ERR("/proc/vc-cma: debug %s", vc_cma_debug ? "on" : "off");
 488 +               rc = size;
 489 +       } else if (strncmp(input_str, RESERVE_STR, strlen(RESERVE_STR)) == 0) {
 490 +               int size;
 491 +               int reserved;
 492 +               char *p = input_str + strlen(RESERVE_STR);
 493 +               while (*p == ' ')
 494 +                       p++;
 495 +               size = memparse(p, NULL);
 496 +
 497 +               reserved = vc_cma_set_reserve(size, current->tgid);
 498 +               rc = (reserved >= 0) ? size : reserved;
 499 +       }
 500 +
 501 +out:
 502 +       return rc;
 503 +}
 504 +
 505 +/****************************************************************************
 506 +*
 507 +*   File Operations for /proc interface.
 508 +*
 509 +***************************************************************************/
 510 +
 511 +static const struct file_operations vc_cma_proc_fops = {
 512 +       .open = vc_cma_proc_open,
 513 +       .read = seq_read,
 514 +       .write = vc_cma_proc_write,
 515 +       .llseek = seq_lseek,
 516 +       .release = single_release
 517 +};
 518 +
 519 +static int vc_cma_set_reserve(unsigned int reserve, unsigned int pid)
 520 +{
 521 +       struct vc_cma_reserve_user *user = NULL;
 522 +       int delta = 0;
 523 +       int i;
 524 +
 525 +       if (down_interruptible(&vc_cma_reserve_mutex))
 526 +               return -ERESTARTSYS;
 527 +
 528 +       for (i = 0; i < vc_cma_reserve_count; i++) {
 529 +               if (pid == vc_cma_reserve_users[i].pid) {
 530 +                       user = &vc_cma_reserve_users[i];
 531 +                       delta = reserve - user->reserve;
 532 +                       if (reserve)
 533 +                               user->reserve = reserve;
 534 +                       else {
 535 +                               /* Remove this entry by copying downwards */
 536 +                               while ((i + 1) < vc_cma_reserve_count) {
 537 +                                       user[0].pid = user[1].pid;
 538 +                                       user[0].reserve = user[1].reserve;
 539 +                                       user++;
 540 +                                       i++;
 541 +                               }
 542 +                               vc_cma_reserve_count--;
 543 +                               user = NULL;
 544 +                       }
 545 +                       break;
 546 +               }
 547 +       }
 548 +
 549 +       if (reserve && !user) {
 550 +               if (vc_cma_reserve_count == VC_CMA_RESERVE_COUNT_MAX) {
 551 +                       LOG_ERR("vc-cma: Too many reservations - "
 552 +                               "increase CMA_RESERVE_COUNT_MAX");
 553 +                       up(&vc_cma_reserve_mutex);
 554 +                       return -EBUSY;
 555 +               }
 556 +               user = &vc_cma_reserve_users[vc_cma_reserve_count];
 557 +               user->pid = pid;
 558 +               user->reserve = reserve;
 559 +               delta = reserve;
 560 +               vc_cma_reserve_count++;
 561 +       }
 562 +
 563 +       vc_cma_reserve_total += delta;
 564 +
 565 +       send_vc_msg(VC_CMA_MSG_RESERVE,
 566 +                   vc_cma_reserve_total & 0xffff, vc_cma_reserve_total >> 16);
 567 +
 568 +       send_worker_msg((VCHIQ_HEADER_T *) VC_CMA_MSG_UPDATE_RESERVE);
 569 +
 570 +       LOG_DBG("/proc/vc-cma: reserve %d (PID %d) - total %u",
 571 +               reserve, pid, vc_cma_reserve_total);
 572 +
 573 +       up(&vc_cma_reserve_mutex);
 574 +
 575 +       return vc_cma_reserve_total;
 576 +}
 577 +
 578 +static VCHIQ_STATUS_T cma_service_callback(VCHIQ_REASON_T reason,
 579 +                                          VCHIQ_HEADER_T * header,
 580 +                                          VCHIQ_SERVICE_HANDLE_T service,
 581 +                                          void *bulk_userdata)
 582 +{
 583 +       switch (reason) {
 584 +       case VCHIQ_MESSAGE_AVAILABLE:
 585 +               if (!send_worker_msg(header))
 586 +                       return VCHIQ_RETRY;
 587 +               break;
 588 +       case VCHIQ_SERVICE_CLOSED:
 589 +               LOG_DBG("CMA service closed");
 590 +               break;
 591 +       default:
 592 +               LOG_ERR("Unexpected CMA callback reason %d", reason);
 593 +               break;
 594 +       }
 595 +       return VCHIQ_SUCCESS;
 596 +}
 597 +
 598 +static void send_vc_msg(unsigned short type,
 599 +                       unsigned short param1, unsigned short param2)
 600 +{
 601 +       unsigned short msg[] = { type, param1, param2 };
 602 +       VCHIQ_ELEMENT_T elem = { &msg, sizeof(msg) };
 603 +       VCHIQ_STATUS_T ret;
 604 +       vchiq_use_service(cma_service);
 605 +       ret = vchiq_queue_message(cma_service, &elem, 1);
 606 +       vchiq_release_service(cma_service);
 607 +       if (ret != VCHIQ_SUCCESS)
 608 +               LOG_ERR("vchiq_queue_message returned %x", ret);
 609 +}
 610 +
 611 +static bool send_worker_msg(VCHIQ_HEADER_T * msg)
 612 +{
 613 +       if (down_interruptible(&vc_cma_worker_queue_push_mutex))
 614 +               return false;
 615 +       vchiu_queue_push(&cma_msg_queue, msg);
 616 +       up(&vc_cma_worker_queue_push_mutex);
 617 +       return true;
 618 +}
 619 +
 620 +static int vc_cma_alloc_chunks(int num_chunks, struct cma_msg *reply)
 621 +{
 622 +       int i;
 623 +       for (i = 0; i < num_chunks; i++) {
 624 +               struct page *chunk;
 625 +               unsigned int chunk_num;
 626 +               uint8_t *chunk_addr;
 627 +               size_t chunk_size = PAGES_PER_CHUNK << PAGE_SHIFT;
 628 +
 629 +               chunk = dma_alloc_from_contiguous(NULL /*&vc_cma_device.dev*/,
 630 +                                                 PAGES_PER_CHUNK,
 631 +                                                 VC_CMA_CHUNK_ORDER);
 632 +               if (!chunk)
 633 +                       break;
 634 +
 635 +               chunk_addr = page_address(chunk);
 636 +               dmac_flush_range(chunk_addr, chunk_addr + chunk_size);
 637 +               outer_inv_range(__pa(chunk_addr), __pa(chunk_addr) +
 638 +                       chunk_size);
 639 +
 640 +               chunk_num =
 641 +                   (page_to_phys(chunk) - vc_cma_base) / VC_CMA_CHUNK_SIZE;
 642 +               BUG_ON(((page_to_phys(chunk) - vc_cma_base) %
 643 +                       VC_CMA_CHUNK_SIZE) != 0);
 644 +               if (chunk_num >= vc_cma_chunks) {
 645 +                       LOG_ERR("%s: ===============================",
 646 +                               __func__);
 647 +                       LOG_ERR("%s: chunk phys %x, vc_cma %x-%x - "
 648 +                               "bad SPARSEMEM configuration?",
 649 +                               __func__, (unsigned int)page_to_phys(chunk),
 650 +                               vc_cma_base, vc_cma_base + vc_cma_size - 1);
 651 +                       LOG_ERR("%s: dev->cma_area = %p\n", __func__,
 652 +                               (void*)0/*vc_cma_device.dev.cma_area*/);
 653 +                       LOG_ERR("%s: ===============================",
 654 +                               __func__);
 655 +                       break;
 656 +               }
 657 +               reply->params[i] = chunk_num;
 658 +               vc_cma_chunks_used++;
 659 +       }
 660 +
 661 +       if (i < num_chunks) {
 662 +               LOG_ERR("%s: dma_alloc_from_contiguous failed "
 663 +                       "for %x bytes (alloc %d of %d, %d free)",
 664 +                       __func__, VC_CMA_CHUNK_SIZE, i,
 665 +                       num_chunks, vc_cma_chunks - vc_cma_chunks_used);
 666 +               num_chunks = i;
 667 +       }
 668 +
 669 +       LOG_DBG("CMA allocated %d chunks -> %d used",
 670 +               num_chunks, vc_cma_chunks_used);
 671 +       reply->type = VC_CMA_MSG_ALLOCATED;
 672 +
 673 +       {
 674 +               VCHIQ_ELEMENT_T elem = {
 675 +                       reply,
 676 +                       offsetof(struct cma_msg, params[0]) +
 677 +                           num_chunks * sizeof(reply->params[0])
 678 +               };
 679 +               VCHIQ_STATUS_T ret;
 680 +               vchiq_use_service(cma_service);
 681 +               ret = vchiq_queue_message(cma_service, &elem, 1);
 682 +               vchiq_release_service(cma_service);
 683 +               if (ret != VCHIQ_SUCCESS)
 684 +                       LOG_ERR("vchiq_queue_message return " "%x", ret);
 685 +       }
 686 +
 687 +       return num_chunks;
 688 +}
 689 +
 690 +static int cma_worker_proc(void *param)
 691 +{
 692 +       static struct cma_msg reply;
 693 +       (void)param;
 694 +
 695 +       while (1) {
 696 +               VCHIQ_HEADER_T *msg;
 697 +               static struct cma_msg msg_copy;
 698 +               struct cma_msg *cma_msg = &msg_copy;
 699 +               int type, msg_size;
 700 +
 701 +               msg = vchiu_queue_pop(&cma_msg_queue);
 702 +               if ((unsigned int)msg >= VC_CMA_MSG_MAX) {
 703 +                       msg_size = msg->size;
 704 +                       memcpy(&msg_copy, msg->data, msg_size);
 705 +                       type = cma_msg->type;
 706 +                       vchiq_release_message(cma_service, msg);
 707 +               } else {
 708 +                       msg_size = 0;
 709 +                       type = (int)msg;
 710 +                       if (type == VC_CMA_MSG_QUIT)
 711 +                               break;
 712 +                       else if (type == VC_CMA_MSG_UPDATE_RESERVE) {
 713 +                               msg = NULL;
 714 +                               cma_msg = NULL;
 715 +                       } else {
 716 +                               BUG();
 717 +                               continue;
 718 +                       }
 719 +               }
 720 +
 721 +               switch (type) {
 722 +               case VC_CMA_MSG_ALLOC:{
 723 +                               int num_chunks, free_chunks;
 724 +                               num_chunks = cma_msg->params[0];
 725 +                               free_chunks =
 726 +                                   vc_cma_chunks - vc_cma_chunks_used;
 727 +                               LOG_DBG("CMA_MSG_ALLOC(%d chunks)", num_chunks);
 728 +                               if (num_chunks > VC_CMA_MAX_PARAMS_PER_MSG) {
 729 +                                       LOG_ERR
 730 +                                           ("CMA_MSG_ALLOC - chunk count (%d) "
 731 +                                            "exceeds VC_CMA_MAX_PARAMS_PER_MSG (%d)",
 732 +                                            num_chunks,
 733 +                                            VC_CMA_MAX_PARAMS_PER_MSG);
 734 +                                       num_chunks = VC_CMA_MAX_PARAMS_PER_MSG;
 735 +                               }
 736 +
 737 +                               if (num_chunks > free_chunks) {
 738 +                                       LOG_ERR
 739 +                                           ("CMA_MSG_ALLOC - chunk count (%d) "
 740 +                                            "exceeds free chunks (%d)",
 741 +                                            num_chunks, free_chunks);
 742 +                                       num_chunks = free_chunks;
 743 +                               }
 744 +
 745 +                               vc_cma_alloc_chunks(num_chunks, &reply);
 746 +                       }
 747 +                       break;
 748 +
 749 +               case VC_CMA_MSG_FREE:{
 750 +                               int chunk_count =
 751 +                                   (msg_size -
 752 +                                    offsetof(struct cma_msg,
 753 +                                             params)) /
 754 +                                   sizeof(cma_msg->params[0]);
 755 +                               int i;
 756 +                               BUG_ON(chunk_count <= 0);
 757 +
 758 +                               LOG_DBG("CMA_MSG_FREE(%d chunks - %x, ...)",
 759 +                                       chunk_count, cma_msg->params[0]);
 760 +                               for (i = 0; i < chunk_count; i++) {
 761 +                                       int chunk_num = cma_msg->params[i];
 762 +                                       struct page *page = vc_cma_base_page +
 763 +                                           chunk_num * PAGES_PER_CHUNK;
 764 +                                       if (chunk_num >= vc_cma_chunks) {
 765 +                                               LOG_ERR
 766 +                                                   ("CMA_MSG_FREE - chunk %d of %d"
 767 +                                                    " (value %x) exceeds maximum "
 768 +                                                    "(%x)", i, chunk_count,
 769 +                                                    chunk_num,
 770 +                                                    vc_cma_chunks - 1);
 771 +                                               break;
 772 +                                       }
 773 +
 774 +                                       if (!dma_release_from_contiguous
 775 +                                           (NULL /*&vc_cma_device.dev*/, page,
 776 +                                            PAGES_PER_CHUNK)) {
 777 +                                               LOG_ERR
 778 +                                                   ("CMA_MSG_FREE - failed to "
 779 +                                                    "release chunk %d (phys %x, "
 780 +                                                    "page %x)", chunk_num,
 781 +                                                    page_to_phys(page),
 782 +                                                    (unsigned int)page);
 783 +                                       }
 784 +                                       vc_cma_chunks_used--;
 785 +                               }
 786 +                               LOG_DBG("CMA released %d chunks -> %d used",
 787 +                                       i, vc_cma_chunks_used);
 788 +                       }
 789 +                       break;
 790 +
 791 +               case VC_CMA_MSG_UPDATE_RESERVE:{
 792 +                               int chunks_needed =
 793 +                                   ((vc_cma_reserve_total + VC_CMA_CHUNK_SIZE -
 794 +                                     1)
 795 +                                    / VC_CMA_CHUNK_SIZE) -
 796 +                                   vc_cma_chunks_reserved;
 797 +
 798 +                               LOG_DBG
 799 +                                   ("CMA_MSG_UPDATE_RESERVE(%d chunks needed)",
 800 +                                    chunks_needed);
 801 +
 802 +                               /* Cap the reservations to what is available */
 803 +                               if (chunks_needed > 0) {
 804 +                                       if (chunks_needed >
 805 +                                           (vc_cma_chunks -
 806 +                                            vc_cma_chunks_used))
 807 +                                               chunks_needed =
 808 +                                                   (vc_cma_chunks -
 809 +                                                    vc_cma_chunks_used);
 810 +
 811 +                                       chunks_needed =
 812 +                                           vc_cma_alloc_chunks(chunks_needed,
 813 +                                                               &reply);
 814 +                               }
 815 +
 816 +                               LOG_DBG
 817 +                                   ("CMA_MSG_UPDATE_RESERVE(%d chunks allocated)",
 818 +                                    chunks_needed);
 819 +                               vc_cma_chunks_reserved += chunks_needed;
 820 +                       }
 821 +                       break;
 822 +
 823 +               default:
 824 +                       LOG_ERR("unexpected msg type %d", type);
 825 +                       break;
 826 +               }
 827 +       }
 828 +
 829 +       LOG_DBG("quitting...");
 830 +       return 0;
 831 +}
 832 +
 833 +/****************************************************************************
 834 +*
 835 +*   vc_cma_connected_init
 836 +*
 837 +*   This function is called once the videocore has been connected.
 838 +*
 839 +***************************************************************************/
 840 +
 841 +static void vc_cma_connected_init(void)
 842 +{
 843 +       VCHIQ_SERVICE_PARAMS_T service_params;
 844 +
 845 +       LOG_DBG("vc_cma_connected_init");
 846 +
 847 +       if (!vchiu_queue_init(&cma_msg_queue, 16)) {
 848 +               LOG_ERR("could not create CMA msg queue");
 849 +               goto fail_queue;
 850 +       }
 851 +
 852 +       if (vchiq_initialise(&cma_instance) != VCHIQ_SUCCESS)
 853 +               goto fail_vchiq_init;
 854 +
 855 +       vchiq_connect(cma_instance);
 856 +
 857 +       service_params.fourcc = VC_CMA_FOURCC;
 858 +       service_params.callback = cma_service_callback;
 859 +       service_params.userdata = NULL;
 860 +       service_params.version = VC_CMA_VERSION;
 861 +       service_params.version_min = VC_CMA_VERSION;
 862 +
 863 +       if (vchiq_open_service(cma_instance, &service_params,
 864 +                              &cma_service) != VCHIQ_SUCCESS) {
 865 +               LOG_ERR("failed to open service - already in use?");
 866 +               goto fail_vchiq_open;
 867 +       }
 868 +
 869 +       vchiq_release_service(cma_service);
 870 +
 871 +       cma_worker = kthread_create(cma_worker_proc, NULL, "cma_worker");
 872 +       if (!cma_worker) {
 873 +               LOG_ERR("could not create CMA worker thread");
 874 +               goto fail_worker;
 875 +       }
 876 +       set_user_nice(cma_worker, -20);
 877 +       wake_up_process(cma_worker);
 878 +
 879 +       return;
 880 +
 881 +fail_worker:
 882 +       vchiq_close_service(cma_service);
 883 +fail_vchiq_open:
 884 +       vchiq_shutdown(cma_instance);
 885 +fail_vchiq_init:
 886 +       vchiu_queue_delete(&cma_msg_queue);
 887 +fail_queue:
 888 +       return;
 889 +}
 890 +
 891 +void
 892 +loud_error_header(void)
 893 +{
 894 +       if (in_loud_error)
 895 +               return;
 896 +
 897 +       LOG_ERR("============================================================"
 898 +               "================");
 899 +       LOG_ERR("============================================================"
 900 +               "================");
 901 +       LOG_ERR("=====");
 902 +
 903 +       in_loud_error = 1;
 904 +}
 905 +
 906 +void
 907 +loud_error_footer(void)
 908 +{
 909 +       if (!in_loud_error)
 910 +               return;
 911 +
 912 +       LOG_ERR("=====");
 913 +       LOG_ERR("============================================================"
 914 +               "================");
 915 +       LOG_ERR("============================================================"
 916 +               "================");
 917 +
 918 +       in_loud_error = 0;
 919 +}
 920 +
 921 +#if 1
 922 +static int check_cma_config(void) { return 1; }
 923 +#else
 924 +static int
 925 +read_vc_debug_var(VC_MEM_ACCESS_HANDLE_T handle,
 926 +       const char *symbol,
 927 +       void *buf, size_t bufsize)
 928 +{
 929 +       VC_MEM_ADDR_T vcMemAddr;
 930 +       size_t vcMemSize;
 931 +       uint8_t *mapAddr;
 932 +       off_t  vcMapAddr;
 933 +
 934 +       if (!LookupVideoCoreSymbol(handle, symbol,
 935 +               &vcMemAddr,
 936 +               &vcMemSize)) {
 937 +               loud_error_header();
 938 +               loud_error(
 939 +                       "failed to find VC symbol \"%s\".",
 940 +                       symbol);
 941 +               loud_error_footer();
 942 +               return 0;
 943 +       }
 944 +
 945 +       if (vcMemSize != bufsize) {
 946 +               loud_error_header();
 947 +               loud_error(
 948 +                       "VC symbol \"%s\" is the wrong size.",
 949 +                       symbol);
 950 +               loud_error_footer();
 951 +               return 0;
 952 +       }
 953 +
 954 +       vcMapAddr = (off_t)vcMemAddr & VC_MEM_TO_ARM_ADDR_MASK;
 955 +       vcMapAddr += mm_vc_mem_phys_addr;
 956 +       mapAddr = ioremap_nocache(vcMapAddr, vcMemSize);
 957 +       if (mapAddr == 0) {
 958 +               loud_error_header();
 959 +               loud_error(
 960 +                       "failed to ioremap \"%s\" @ 0x%x "
 961 +                       "(phys: 0x%x, size: %u).",
 962 +                       symbol,
 963 +                       (unsigned int)vcMapAddr,
 964 +                       (unsigned int)vcMemAddr,
 965 +                       (unsigned int)vcMemSize);
 966 +               loud_error_footer();
 967 +               return 0;
 968 +       }
 969 +
 970 +       memcpy(buf, mapAddr, bufsize);
 971 +       iounmap(mapAddr);
 972 +
 973 +       return 1;
 974 +}
 975 +
 976 +
 977 +static int
 978 +check_cma_config(void)
 979 +{
 980 +       VC_MEM_ACCESS_HANDLE_T mem_hndl;
 981 +       VC_MEM_ADDR_T mempool_start;
 982 +       VC_MEM_ADDR_T mempool_end;
 983 +       VC_MEM_ADDR_T mempool_offline_start;
 984 +       VC_MEM_ADDR_T mempool_offline_end;
 985 +       VC_MEM_ADDR_T cam_alloc_base;
 986 +       VC_MEM_ADDR_T cam_alloc_size;
 987 +       VC_MEM_ADDR_T cam_alloc_end;
 988 +       int success = 0;
 989 +
 990 +       if (OpenVideoCoreMemory(&mem_hndl) != 0)
 991 +               goto out;
 992 +
 993 +       /* Read the relevant VideoCore variables */
 994 +       if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_START",
 995 +               &mempool_start,
 996 +               sizeof(mempool_start)))
 997 +               goto close;
 998 +
 999 +       if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_END",
1000 +               &mempool_end,
1001 +               sizeof(mempool_end)))
1002 +               goto close;
1003 +
1004 +       if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_OFFLINE_START",
1005 +               &mempool_offline_start,
1006 +               sizeof(mempool_offline_start)))
1007 +               goto close;
1008 +
1009 +       if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_OFFLINE_END",
1010 +               &mempool_offline_end,
1011 +               sizeof(mempool_offline_end)))
1012 +               goto close;
1013 +
1014 +       if (!read_vc_debug_var(mem_hndl, "cam_alloc_base",
1015 +               &cam_alloc_base,
1016 +               sizeof(cam_alloc_base)))
1017 +               goto close;
1018 +
1019 +       if (!read_vc_debug_var(mem_hndl, "cam_alloc_size",
1020 +               &cam_alloc_size,
1021 +               sizeof(cam_alloc_size)))
1022 +               goto close;
1023 +
1024 +       cam_alloc_end = cam_alloc_base + cam_alloc_size;
1025 +
1026 +       success = 1;
1027 +
1028 +       /* Now the sanity checks */
1029 +       if (!mempool_offline_start)
1030 +               mempool_offline_start = mempool_start;
1031 +       if (!mempool_offline_end)
1032 +               mempool_offline_end = mempool_end;
1033 +
1034 +       if (VCADDR_TO_PHYSADDR(mempool_offline_start) != vc_cma_base) {
1035 +               loud_error_header();
1036 +               loud_error(
1037 +                       "__MEMPOOL_OFFLINE_START(%x -> %lx) doesn't match "
1038 +                       "vc_cma_base(%x)",
1039 +                       mempool_offline_start,
1040 +                       VCADDR_TO_PHYSADDR(mempool_offline_start),
1041 +                       vc_cma_base);
1042 +               success = 0;
1043 +       }
1044 +
1045 +       if (VCADDR_TO_PHYSADDR(mempool_offline_end) !=
1046 +               (vc_cma_base + vc_cma_size)) {
1047 +               loud_error_header();
1048 +               loud_error(
1049 +                       "__MEMPOOL_OFFLINE_END(%x -> %lx) doesn't match "
1050 +                       "vc_cma_base(%x) + vc_cma_size(%x) = %x",
1051 +                       mempool_offline_start,
1052 +                       VCADDR_TO_PHYSADDR(mempool_offline_end),
1053 +                       vc_cma_base, vc_cma_size, vc_cma_base + vc_cma_size);
1054 +               success = 0;
1055 +       }
1056 +
1057 +       if (mempool_end < mempool_start) {
1058 +               loud_error_header();
1059 +               loud_error(
1060 +                       "__MEMPOOL_END(%x) must not be before "
1061 +                       "__MEMPOOL_START(%x)",
1062 +                       mempool_end,
1063 +                       mempool_start);
1064 +               success = 0;
1065 +       }
1066 +
1067 +       if (mempool_offline_end < mempool_offline_start) {
1068 +               loud_error_header();
1069 +               loud_error(
1070 +                       "__MEMPOOL_OFFLINE_END(%x) must not be before "
1071 +                       "__MEMPOOL_OFFLINE_START(%x)",
1072 +                       mempool_offline_end,
1073 +                       mempool_offline_start);
1074 +               success = 0;
1075 +       }
1076 +
1077 +       if (mempool_offline_start < mempool_start) {
1078 +               loud_error_header();
1079 +               loud_error(
1080 +                       "__MEMPOOL_OFFLINE_START(%x) must not be before "
1081 +                       "__MEMPOOL_START(%x)",
1082 +                       mempool_offline_start,
1083 +                       mempool_start);
1084 +               success = 0;
1085 +       }
1086 +
1087 +       if (mempool_offline_end > mempool_end) {
1088 +               loud_error_header();
1089 +               loud_error(
1090 +                       "__MEMPOOL_OFFLINE_END(%x) must not be after "
1091 +                       "__MEMPOOL_END(%x)",
1092 +                       mempool_offline_end,
1093 +                       mempool_end);
1094 +               success = 0;
1095 +       }
1096 +
1097 +       if ((cam_alloc_base < mempool_end) &&
1098 +               (cam_alloc_end > mempool_start)) {
1099 +               loud_error_header();
1100 +               loud_error(
1101 +                       "cam_alloc pool(%x-%x) overlaps "
1102 +                       "mempool(%x-%x)",
1103 +                       cam_alloc_base, cam_alloc_end,
1104 +                       mempool_start, mempool_end);
1105 +               success = 0;
1106 +       }
1107 +
1108 +       loud_error_footer();
1109 +
1110 +close:
1111 +       CloseVideoCoreMemory(mem_hndl);
1112 +
1113 +out:
1114 +       return success;
1115 +}
1116 +#endif
1117 +
1118 +static int vc_cma_init(void)
1119 +{
1120 +       int rc = -EFAULT;
1121 +       struct device *dev;
1122 +
1123 +       if (!check_cma_config())
1124 +               goto out_release;
1125 +
1126 +       printk(KERN_INFO "vc-cma: Videocore CMA driver\n");
1127 +       printk(KERN_INFO "vc-cma: vc_cma_base      = 0x%08x\n", vc_cma_base);
1128 +       printk(KERN_INFO "vc-cma: vc_cma_size      = 0x%08x (%u MiB)\n",
1129 +              vc_cma_size, vc_cma_size / (1024 * 1024));
1130 +       printk(KERN_INFO "vc-cma: vc_cma_initial   = 0x%08x (%u MiB)\n",
1131 +              vc_cma_initial, vc_cma_initial / (1024 * 1024));
1132 +
1133 +       vc_cma_base_page = phys_to_page(vc_cma_base);
1134 +
1135 +       if (vc_cma_chunks) {
1136 +               int chunks_needed = vc_cma_initial / VC_CMA_CHUNK_SIZE;
1137 +
1138 +               for (vc_cma_chunks_used = 0;
1139 +                    vc_cma_chunks_used < chunks_needed; vc_cma_chunks_used++) {
1140 +                       struct page *chunk;
1141 +                       chunk = dma_alloc_from_contiguous(NULL /*&vc_cma_device.dev*/,
1142 +                                                         PAGES_PER_CHUNK,
1143 +                                                         VC_CMA_CHUNK_ORDER);
1144 +                       if (!chunk)
1145 +                               break;
1146 +                       BUG_ON(((page_to_phys(chunk) - vc_cma_base) %
1147 +                               VC_CMA_CHUNK_SIZE) != 0);
1148 +               }
1149 +               if (vc_cma_chunks_used != chunks_needed) {
1150 +                       LOG_ERR("%s: dma_alloc_from_contiguous failed (%d "
1151 +                               "bytes, allocation %d of %d)",
1152 +                               __func__, VC_CMA_CHUNK_SIZE,
1153 +                               vc_cma_chunks_used, chunks_needed);
1154 +                       goto out_release;
1155 +               }
1156 +
1157 +               vchiq_add_connected_callback(vc_cma_connected_init);
1158 +       }
1159 +
1160 +       rc = alloc_chrdev_region(&vc_cma_devnum, 0, 1, DRIVER_NAME);
1161 +       if (rc < 0) {
1162 +               LOG_ERR("%s: alloc_chrdev_region failed (rc=%d)", __func__, rc);
1163 +               goto out_release;
1164 +       }
1165 +
1166 +       cdev_init(&vc_cma_cdev, &vc_cma_fops);
1167 +       rc = cdev_add(&vc_cma_cdev, vc_cma_devnum, 1);
1168 +       if (rc != 0) {
1169 +               LOG_ERR("%s: cdev_add failed (rc=%d)", __func__, rc);
1170 +               goto out_unregister;
1171 +       }
1172 +
1173 +       vc_cma_class = class_create(THIS_MODULE, DRIVER_NAME);
1174 +       if (IS_ERR(vc_cma_class)) {
1175 +               rc = PTR_ERR(vc_cma_class);
1176 +               LOG_ERR("%s: class_create failed (rc=%d)", __func__, rc);
1177 +               goto out_cdev_del;
1178 +       }
1179 +
1180 +       dev = device_create(vc_cma_class, NULL, vc_cma_devnum, NULL,
1181 +                           DRIVER_NAME);
1182 +       if (IS_ERR(dev)) {
1183 +               rc = PTR_ERR(dev);
1184 +               LOG_ERR("%s: device_create failed (rc=%d)", __func__, rc);
1185 +               goto out_class_destroy;
1186 +       }
1187 +
1188 +       vc_cma_proc_entry = proc_create(DRIVER_NAME, 0444, NULL, &vc_cma_proc_fops);
1189 +       if (vc_cma_proc_entry == NULL) {
1190 +               rc = -EFAULT;
1191 +               LOG_ERR("%s: proc_create failed", __func__);
1192 +               goto out_device_destroy;
1193 +       }
1194 +
1195 +       vc_cma_inited = 1;
1196 +       return 0;
1197 +
1198 +out_device_destroy:
1199 +       device_destroy(vc_cma_class, vc_cma_devnum);
1200 +
1201 +out_class_destroy:
1202 +       class_destroy(vc_cma_class);
1203 +       vc_cma_class = NULL;
1204 +
1205 +out_cdev_del:
1206 +       cdev_del(&vc_cma_cdev);
1207 +
1208 +out_unregister:
1209 +       unregister_chrdev_region(vc_cma_devnum, 1);
1210 +
1211 +out_release:
1212 +       /* It is tempting to try to clean up by calling
1213 +          dma_release_from_contiguous for all allocated chunks, but it isn't
1214 +          a very safe thing to do. If vc_cma_initial is non-zero it is because
1215 +          VideoCore is already using that memory, so giving it back to Linux
1216 +          is likely to be fatal.
1217 +        */
1218 +       return -1;
1219 +}
1220 +
1221 +/****************************************************************************
1222 +*
1223 +*   vc_cma_exit
1224 +*
1225 +***************************************************************************/
1226 +
1227 +static void __exit vc_cma_exit(void)
1228 +{
1229 +       LOG_DBG("%s: called", __func__);
1230 +
1231 +       if (vc_cma_inited) {
1232 +               remove_proc_entry(DRIVER_NAME, NULL);
1233 +               device_destroy(vc_cma_class, vc_cma_devnum);
1234 +               class_destroy(vc_cma_class);
1235 +               cdev_del(&vc_cma_cdev);
1236 +               unregister_chrdev_region(vc_cma_devnum, 1);
1237 +       }
1238 +}
1239 +
1240 +module_init(vc_cma_init);
1241 +module_exit(vc_cma_exit);
1242 +MODULE_LICENSE("GPL");
1243 +MODULE_AUTHOR("Broadcom Corporation");
1244 diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
1245 index ad85616..8418ba7 100644
1246 --- a/drivers/misc/Makefile
1247 +++ b/drivers/misc/Makefile
1248 @@ -52,6 +52,6 @@ obj-$(CONFIG_INTEL_MEI)               += mei/
1249  obj-$(CONFIG_VMWARE_VMCI)      += vmw_vmci/
1250  obj-$(CONFIG_LATTICE_ECP3_CONFIG)      += lattice-ecp3-config.o
1251  obj-$(CONFIG_SRAM)             += sram.o
1252 -obj-y                          += vc04_services/
1253 +obj-$(CONFIG_BCM2708_VCHIQ)    += vc04_services/
1254  obj-y                          += mic/
1255  obj-$(CONFIG_GENWQE)           += genwqe/
1256 diff --git a/include/linux/broadcom/vc_cma.h b/include/linux/broadcom/vc_cma.h
1257 new file mode 100644
1258 index 0000000..5325832
1259 --- /dev/null
1260 +++ b/include/linux/broadcom/vc_cma.h
1261 @@ -0,0 +1,29 @@
1262 +/*****************************************************************************
1263 +* Copyright 2012 Broadcom Corporation.  All rights reserved.
1264 +*
1265 +* Unless you and Broadcom execute a separate written software license
1266 +* agreement governing use of this software, this software is licensed to you
1267 +* under the terms of the GNU General Public License version 2, available at
1268 +* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
1269 +*
1270 +* Notwithstanding the above, under no circumstances may you combine this
1271 +* software in any way with any other Broadcom software provided under a
1272 +* license other than the GPL, without Broadcom's express prior written
1273 +* consent.
1274 +*****************************************************************************/
1275 +
1276 +#if !defined( VC_CMA_H )
1277 +#define VC_CMA_H
1278 +
1279 +#include <linux/ioctl.h>
1280 +
1281 +#define VC_CMA_IOC_MAGIC 0xc5
1282 +
1283 +#define VC_CMA_IOC_RESERVE _IO(VC_CMA_IOC_MAGIC, 0)
1284 +
1285 +#ifdef __KERNEL__
1286 +extern void __init vc_cma_early_init(void);
1287 +extern void __init vc_cma_reserve(void);
1288 +#endif
1289 +
1290 +#endif /* VC_CMA_H */
1291 --
1292 1.9.1
1293