target/linux/brcm2708/patches-3.18/0012-cma-Add-vc_cma-driver-to-enable-use-of-CMA.patch

   1 From 725e07b7b70c601ebbe15436736addc01953dfe7 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 012/114] 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                 |    1 +
  10  drivers/char/broadcom/Kconfig         |   15 +
  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, 1206 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 efefd12..aebd7ca 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 d06cde26..a9f9daf 100644
  38 --- a/drivers/char/Makefile
  39 +++ b/drivers/char/Makefile
  40 @@ -62,3 +62,4 @@ js-rtc-y = rtc.o
  41
  42  obj-$(CONFIG_TILE_SROM)                += tile-srom.o
  43  obj-$(CONFIG_XILLYBUS)         += xillybus/
  44 +obj-$(CONFIG_BRCM_CHAR_DRIVERS) += broadcom/
  45 diff --git a/drivers/char/broadcom/Kconfig b/drivers/char/broadcom/Kconfig
  46 new file mode 100644
  47 index 0000000..2d8bd6e
  48 --- /dev/null
  49 +++ b/drivers/char/broadcom/Kconfig
  50 @@ -0,0 +1,15 @@
  51 +#
  52 +# Broadcom char driver config
  53 +#
  54 +
  55 +menuconfig BRCM_CHAR_DRIVERS
  56 +       bool "Broadcom Char Drivers"
  57 +       help
  58 +         Broadcom's char drivers
  59 +
  60 +config BCM_VC_CMA
  61 +       bool "Videocore CMA"
  62 +       depends on CMA && BRCM_CHAR_DRIVERS && BCM2708_VCHIQ
  63 +       default n
  64 +        help
  65 +          Helper for videocore CMA access.
  66 diff --git a/drivers/char/broadcom/Makefile b/drivers/char/broadcom/Makefile
  67 new file mode 100644
  68 index 0000000..13c5bca
  69 --- /dev/null
  70 +++ b/drivers/char/broadcom/Makefile
  71 @@ -0,0 +1 @@
  72 +obj-$(CONFIG_BCM_VC_CMA)       += vc_cma/
  73 diff --git a/drivers/char/broadcom/vc_cma/Makefile b/drivers/char/broadcom/vc_cma/Makefile
  74 new file mode 100644
  75 index 0000000..6a94de4
  76 --- /dev/null
  77 +++ b/drivers/char/broadcom/vc_cma/Makefile
  78 @@ -0,0 +1,14 @@
  79 +ccflags-y  += -Wall -Wstrict-prototypes -Wno-trigraphs
  80 +ccflags-y  += -Werror
  81 +ccflags-y  += -Iinclude/linux/broadcom
  82 +ccflags-y  += -Idrivers/misc/vc04_services
  83 +ccflags-y  += -Idrivers/misc/vc04_services/interface/vchi
  84 +ccflags-y  += -Idrivers/misc/vc04_services/interface/vchiq_arm
  85 +
  86 +ccflags-y  += -D__KERNEL__
  87 +ccflags-y  += -D__linux__
  88 +ccflags-y  += -Werror
  89 +
  90 +obj-$(CONFIG_BCM_VC_CMA) += vc-cma.o
  91 +
  92 +vc-cma-objs := vc_cma.o
  93 diff --git a/drivers/char/broadcom/vc_cma/vc_cma.c b/drivers/char/broadcom/vc_cma/vc_cma.c
  94 new file mode 100644
  95 index 0000000..a635f9f
  96 --- /dev/null
  97 +++ b/drivers/char/broadcom/vc_cma/vc_cma.c
  98 @@ -0,0 +1,1143 @@
  99 +/**
 100 + * Copyright (c) 2010-2012 Broadcom. All rights reserved.
 101 + *
 102 + * Redistribution and use in source and binary forms, with or without
 103 + * modification, are permitted provided that the following conditions
 104 + * are met:
 105 + * 1. Redistributions of source code must retain the above copyright
 106 + *    notice, this list of conditions, and the following disclaimer,
 107 + *    without modification.
 108 + * 2. Redistributions in binary form must reproduce the above copyright
 109 + *    notice, this list of conditions and the following disclaimer in the
 110 + *    documentation and/or other materials provided with the distribution.
 111 + * 3. The names of the above-listed copyright holders may not be used
 112 + *    to endorse or promote products derived from this software without
 113 + *    specific prior written permission.
 114 + *
 115 + * ALTERNATIVELY, this software may be distributed under the terms of the
 116 + * GNU General Public License ("GPL") version 2, as published by the Free
 117 + * Software Foundation.
 118 + *
 119 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 120 + * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 121 + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 122 + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 123 + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 124 + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 125 + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 126 + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 127 + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 128 + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 129 + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 130 + */
 131 +
 132 +#include <linux/kernel.h>
 133 +#include <linux/module.h>
 134 +#include <linux/kthread.h>
 135 +#include <linux/fs.h>
 136 +#include <linux/device.h>
 137 +#include <linux/cdev.h>
 138 +#include <linux/mm.h>
 139 +#include <linux/proc_fs.h>
 140 +#include <linux/seq_file.h>
 141 +#include <linux/dma-mapping.h>
 142 +#include <linux/dma-contiguous.h>
 143 +#include <linux/platform_device.h>
 144 +#include <linux/uaccess.h>
 145 +#include <asm/cacheflush.h>
 146 +
 147 +#include "vc_cma.h"
 148 +
 149 +#include "vchiq_util.h"
 150 +#include "vchiq_connected.h"
 151 +//#include "debug_sym.h"
 152 +//#include "vc_mem.h"
 153 +
 154 +#define DRIVER_NAME  "vc-cma"
 155 +
 156 +#define LOG_DBG(fmt, ...) \
 157 +       if (vc_cma_debug) \
 158 +               printk(KERN_INFO fmt "\n", ##__VA_ARGS__)
 159 +#define LOG_ERR(fmt, ...) \
 160 +       printk(KERN_ERR fmt "\n", ##__VA_ARGS__)
 161 +
 162 +#define VC_CMA_FOURCC VCHIQ_MAKE_FOURCC('C', 'M', 'A', ' ')
 163 +#define VC_CMA_VERSION 2
 164 +
 165 +#define VC_CMA_CHUNK_ORDER 6   /* 256K */
 166 +#define VC_CMA_CHUNK_SIZE (4096 << VC_CMA_CHUNK_ORDER)
 167 +#define VC_CMA_MAX_PARAMS_PER_MSG \
 168 +       ((VCHIQ_MAX_MSG_SIZE - sizeof(unsigned short))/sizeof(unsigned short))
 169 +#define VC_CMA_RESERVE_COUNT_MAX 16
 170 +
 171 +#define PAGES_PER_CHUNK (VC_CMA_CHUNK_SIZE / PAGE_SIZE)
 172 +
 173 +#define VCADDR_TO_PHYSADDR(vcaddr) (mm_vc_mem_phys_addr + vcaddr)
 174 +
 175 +#define loud_error(...) \
 176 +       LOG_ERR("===== " __VA_ARGS__)
 177 +
 178 +enum {
 179 +       VC_CMA_MSG_QUIT,
 180 +       VC_CMA_MSG_OPEN,
 181 +       VC_CMA_MSG_TICK,
 182 +       VC_CMA_MSG_ALLOC,       /* chunk count */
 183 +       VC_CMA_MSG_FREE,        /* chunk, chunk, ... */
 184 +       VC_CMA_MSG_ALLOCATED,   /* chunk, chunk, ... */
 185 +       VC_CMA_MSG_REQUEST_ALLOC,       /* chunk count */
 186 +       VC_CMA_MSG_REQUEST_FREE,        /* chunk count */
 187 +       VC_CMA_MSG_RESERVE,     /* bytes lo, bytes hi */
 188 +       VC_CMA_MSG_UPDATE_RESERVE,
 189 +       VC_CMA_MSG_MAX
 190 +};
 191 +
 192 +struct cma_msg {
 193 +       unsigned short type;
 194 +       unsigned short params[VC_CMA_MAX_PARAMS_PER_MSG];
 195 +};
 196 +
 197 +struct vc_cma_reserve_user {
 198 +       unsigned int pid;
 199 +       unsigned int reserve;
 200 +};
 201 +
 202 +/* Device (/dev) related variables */
 203 +static dev_t vc_cma_devnum;
 204 +static struct class *vc_cma_class;
 205 +static struct cdev vc_cma_cdev;
 206 +static int vc_cma_inited;
 207 +static int vc_cma_debug;
 208 +
 209 +/* Proc entry */
 210 +static struct proc_dir_entry *vc_cma_proc_entry;
 211 +
 212 +phys_addr_t vc_cma_base;
 213 +struct page *vc_cma_base_page;
 214 +unsigned int vc_cma_size;
 215 +EXPORT_SYMBOL(vc_cma_size);
 216 +unsigned int vc_cma_initial;
 217 +unsigned int vc_cma_chunks;
 218 +unsigned int vc_cma_chunks_used;
 219 +unsigned int vc_cma_chunks_reserved;
 220 +
 221 +static int in_loud_error;
 222 +
 223 +unsigned int vc_cma_reserve_total;
 224 +unsigned int vc_cma_reserve_count;
 225 +struct vc_cma_reserve_user vc_cma_reserve_users[VC_CMA_RESERVE_COUNT_MAX];
 226 +static DEFINE_SEMAPHORE(vc_cma_reserve_mutex);
 227 +static DEFINE_SEMAPHORE(vc_cma_worker_queue_push_mutex);
 228 +
 229 +static u64 vc_cma_dma_mask = DMA_BIT_MASK(32);
 230 +static struct platform_device vc_cma_device = {
 231 +       .name = "vc-cma",
 232 +       .id = 0,
 233 +       .dev = {
 234 +               .dma_mask = &vc_cma_dma_mask,
 235 +               .coherent_dma_mask = DMA_BIT_MASK(32),
 236 +               },
 237 +};
 238 +
 239 +static VCHIQ_INSTANCE_T cma_instance;
 240 +static VCHIQ_SERVICE_HANDLE_T cma_service;
 241 +static VCHIU_QUEUE_T cma_msg_queue;
 242 +static struct task_struct *cma_worker;
 243 +
 244 +static int vc_cma_set_reserve(unsigned int reserve, unsigned int pid);
 245 +static int vc_cma_alloc_chunks(int num_chunks, struct cma_msg *reply);
 246 +static VCHIQ_STATUS_T cma_service_callback(VCHIQ_REASON_T reason,
 247 +                                          VCHIQ_HEADER_T * header,
 248 +                                          VCHIQ_SERVICE_HANDLE_T service,
 249 +                                          void *bulk_userdata);
 250 +static void send_vc_msg(unsigned short type,
 251 +                       unsigned short param1, unsigned short param2);
 252 +static bool send_worker_msg(VCHIQ_HEADER_T * msg);
 253 +
 254 +static int early_vc_cma_mem(char *p)
 255 +{
 256 +       unsigned int new_size;
 257 +       printk(KERN_NOTICE "early_vc_cma_mem(%s)", p);
 258 +       vc_cma_size = memparse(p, &p);
 259 +       vc_cma_initial = vc_cma_size;
 260 +       if (*p == '/')
 261 +               vc_cma_size = memparse(p + 1, &p);
 262 +       if (*p == '@')
 263 +               vc_cma_base = memparse(p + 1, &p);
 264 +
 265 +       new_size = (vc_cma_size - ((-vc_cma_base) & (VC_CMA_CHUNK_SIZE - 1)))
 266 +           & ~(VC_CMA_CHUNK_SIZE - 1);
 267 +       if (new_size > vc_cma_size)
 268 +               vc_cma_size = 0;
 269 +       vc_cma_initial = (vc_cma_initial + VC_CMA_CHUNK_SIZE - 1)
 270 +           & ~(VC_CMA_CHUNK_SIZE - 1);
 271 +       if (vc_cma_initial > vc_cma_size)
 272 +               vc_cma_initial = vc_cma_size;
 273 +       vc_cma_base = (vc_cma_base + VC_CMA_CHUNK_SIZE - 1)
 274 +           & ~(VC_CMA_CHUNK_SIZE - 1);
 275 +
 276 +       printk(KERN_NOTICE " -> initial %x, size %x, base %x", vc_cma_initial,
 277 +              vc_cma_size, (unsigned int)vc_cma_base);
 278 +
 279 +       return 0;
 280 +}
 281 +
 282 +early_param("vc-cma-mem", early_vc_cma_mem);
 283 +
 284 +void vc_cma_early_init(void)
 285 +{
 286 +       LOG_DBG("vc_cma_early_init - vc_cma_chunks = %d", vc_cma_chunks);
 287 +       if (vc_cma_size) {
 288 +               int rc = platform_device_register(&vc_cma_device);
 289 +               LOG_DBG("platform_device_register -> %d", rc);
 290 +       }
 291 +}
 292 +
 293 +void vc_cma_reserve(void)
 294 +{
 295 +       /* if vc_cma_size is set, then declare vc CMA area of the same
 296 +        * size from the end of memory
 297 +        */
 298 +       if (vc_cma_size) {
 299 +               if (dma_declare_contiguous(NULL /*&vc_cma_device.dev*/, vc_cma_size,
 300 +                                          vc_cma_base, 0) == 0) {
 301 +               } else {
 302 +                       LOG_ERR("vc_cma: dma_declare_contiguous(%x,%x) failed",
 303 +                               vc_cma_size, (unsigned int)vc_cma_base);
 304 +                       vc_cma_size = 0;
 305 +               }
 306 +       }
 307 +       vc_cma_chunks = vc_cma_size / VC_CMA_CHUNK_SIZE;
 308 +}
 309 +
 310 +/****************************************************************************
 311 +*
 312 +*   vc_cma_open
 313 +*
 314 +***************************************************************************/
 315 +
 316 +static int vc_cma_open(struct inode *inode, struct file *file)
 317 +{
 318 +       (void)inode;
 319 +       (void)file;
 320 +
 321 +       return 0;
 322 +}
 323 +
 324 +/****************************************************************************
 325 +*
 326 +*   vc_cma_release
 327 +*
 328 +***************************************************************************/
 329 +
 330 +static int vc_cma_release(struct inode *inode, struct file *file)
 331 +{
 332 +       (void)inode;
 333 +       (void)file;
 334 +
 335 +       vc_cma_set_reserve(0, current->tgid);
 336 +
 337 +       return 0;
 338 +}
 339 +
 340 +/****************************************************************************
 341 +*
 342 +*   vc_cma_ioctl
 343 +*
 344 +***************************************************************************/
 345 +
 346 +static long vc_cma_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 347 +{
 348 +       int rc = 0;
 349 +
 350 +       (void)cmd;
 351 +       (void)arg;
 352 +
 353 +       switch (cmd) {
 354 +       case VC_CMA_IOC_RESERVE:
 355 +               rc = vc_cma_set_reserve((unsigned int)arg, current->tgid);
 356 +               if (rc >= 0)
 357 +                       rc = 0;
 358 +               break;
 359 +       default:
 360 +               LOG_ERR("vc-cma: Unknown ioctl %x", cmd);
 361 +               return -ENOTTY;
 362 +       }
 363 +
 364 +       return rc;
 365 +}
 366 +
 367 +/****************************************************************************
 368 +*
 369 +*   File Operations for the driver.
 370 +*
 371 +***************************************************************************/
 372 +
 373 +static const struct file_operations vc_cma_fops = {
 374 +       .owner = THIS_MODULE,
 375 +       .open = vc_cma_open,
 376 +       .release = vc_cma_release,
 377 +       .unlocked_ioctl = vc_cma_ioctl,
 378 +};
 379 +
 380 +/****************************************************************************
 381 +*
 382 +*   vc_cma_proc_open
 383 +*
 384 +***************************************************************************/
 385 +
 386 +static int vc_cma_show_info(struct seq_file *m, void *v)
 387 +{
 388 +       int i;
 389 +
 390 +       seq_printf(m, "Videocore CMA:\n");
 391 +       seq_printf(m, "   Base       : %08x\n", (unsigned int)vc_cma_base);
 392 +       seq_printf(m, "   Length     : %08x\n", vc_cma_size);
 393 +       seq_printf(m, "   Initial    : %08x\n", vc_cma_initial);
 394 +       seq_printf(m, "   Chunk size : %08x\n", VC_CMA_CHUNK_SIZE);
 395 +       seq_printf(m, "   Chunks     : %4d (%d bytes)\n",
 396 +                  (int)vc_cma_chunks,
 397 +                  (int)(vc_cma_chunks * VC_CMA_CHUNK_SIZE));
 398 +       seq_printf(m, "   Used       : %4d (%d bytes)\n",
 399 +                  (int)vc_cma_chunks_used,
 400 +                  (int)(vc_cma_chunks_used * VC_CMA_CHUNK_SIZE));
 401 +       seq_printf(m, "   Reserved   : %4d (%d bytes)\n",
 402 +                  (unsigned int)vc_cma_chunks_reserved,
 403 +                  (int)(vc_cma_chunks_reserved * VC_CMA_CHUNK_SIZE));
 404 +
 405 +       for (i = 0; i < vc_cma_reserve_count; i++) {
 406 +               struct vc_cma_reserve_user *user = &vc_cma_reserve_users[i];
 407 +               seq_printf(m, "     PID %5d: %d bytes\n", user->pid,
 408 +                          user->reserve);
 409 +       }
 410 +
 411 +       seq_printf(m, "\n");
 412 +
 413 +       return 0;
 414 +}
 415 +
 416 +static int vc_cma_proc_open(struct inode *inode, struct file *file)
 417 +{
 418 +       return single_open(file, vc_cma_show_info, NULL);
 419 +}
 420 +
 421 +/****************************************************************************
 422 +*
 423 +*   vc_cma_proc_write
 424 +*
 425 +***************************************************************************/
 426 +
 427 +static int vc_cma_proc_write(struct file *file,
 428 +                            const char __user *buffer,
 429 +                            size_t size, loff_t *ppos)
 430 +{
 431 +       int rc = -EFAULT;
 432 +       char input_str[20];
 433 +
 434 +       memset(input_str, 0, sizeof(input_str));
 435 +
 436 +       if (size > sizeof(input_str)) {
 437 +               LOG_ERR("%s: input string length too long", __func__);
 438 +               goto out;
 439 +       }
 440 +
 441 +       if (copy_from_user(input_str, buffer, size - 1)) {
 442 +               LOG_ERR("%s: failed to get input string", __func__);
 443 +               goto out;
 444 +       }
 445 +#define ALLOC_STR "alloc"
 446 +#define FREE_STR "free"
 447 +#define DEBUG_STR "debug"
 448 +#define RESERVE_STR "reserve"
 449 +       if (strncmp(input_str, ALLOC_STR, strlen(ALLOC_STR)) == 0) {
 450 +               int size;
 451 +               char *p = input_str + strlen(ALLOC_STR);
 452 +
 453 +               while (*p == ' ')
 454 +                       p++;
 455 +               size = memparse(p, NULL);
 456 +               LOG_ERR("/proc/vc-cma: alloc %d", size);
 457 +               if (size)
 458 +                       send_vc_msg(VC_CMA_MSG_REQUEST_FREE,
 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, FREE_STR, strlen(FREE_STR)) == 0) {
 464 +               int size;
 465 +               char *p = input_str + strlen(FREE_STR);
 466 +
 467 +               while (*p == ' ')
 468 +                       p++;
 469 +               size = memparse(p, NULL);
 470 +               LOG_ERR("/proc/vc-cma: free %d", size);
 471 +               if (size)
 472 +                       send_vc_msg(VC_CMA_MSG_REQUEST_ALLOC,
 473 +                                   size / VC_CMA_CHUNK_SIZE, 0);
 474 +               else
 475 +                       LOG_ERR("invalid size '%s'", p);
 476 +               rc = size;
 477 +       } else if (strncmp(input_str, DEBUG_STR, strlen(DEBUG_STR)) == 0) {
 478 +               char *p = input_str + strlen(DEBUG_STR);
 479 +               while (*p == ' ')
 480 +                       p++;
 481 +               if ((strcmp(p, "on") == 0) || (strcmp(p, "1") == 0))
 482 +                       vc_cma_debug = 1;
 483 +               else if ((strcmp(p, "off") == 0) || (strcmp(p, "0") == 0))
 484 +                       vc_cma_debug = 0;
 485 +               LOG_ERR("/proc/vc-cma: debug %s", vc_cma_debug ? "on" : "off");
 486 +               rc = size;
 487 +       } else if (strncmp(input_str, RESERVE_STR, strlen(RESERVE_STR)) == 0) {
 488 +               int size;
 489 +               int reserved;
 490 +               char *p = input_str + strlen(RESERVE_STR);
 491 +               while (*p == ' ')
 492 +                       p++;
 493 +               size = memparse(p, NULL);
 494 +
 495 +               reserved = vc_cma_set_reserve(size, current->tgid);
 496 +               rc = (reserved >= 0) ? size : reserved;
 497 +       }
 498 +
 499 +out:
 500 +       return rc;
 501 +}
 502 +
 503 +/****************************************************************************
 504 +*
 505 +*   File Operations for /proc interface.
 506 +*
 507 +***************************************************************************/
 508 +
 509 +static const struct file_operations vc_cma_proc_fops = {
 510 +       .open = vc_cma_proc_open,
 511 +       .read = seq_read,
 512 +       .write = vc_cma_proc_write,
 513 +       .llseek = seq_lseek,
 514 +       .release = single_release
 515 +};
 516 +
 517 +static int vc_cma_set_reserve(unsigned int reserve, unsigned int pid)
 518 +{
 519 +       struct vc_cma_reserve_user *user = NULL;
 520 +       int delta = 0;
 521 +       int i;
 522 +
 523 +       if (down_interruptible(&vc_cma_reserve_mutex))
 524 +               return -ERESTARTSYS;
 525 +
 526 +       for (i = 0; i < vc_cma_reserve_count; i++) {
 527 +               if (pid == vc_cma_reserve_users[i].pid) {
 528 +                       user = &vc_cma_reserve_users[i];
 529 +                       delta = reserve - user->reserve;
 530 +                       if (reserve)
 531 +                               user->reserve = reserve;
 532 +                       else {
 533 +                               /* Remove this entry by copying downwards */
 534 +                               while ((i + 1) < vc_cma_reserve_count) {
 535 +                                       user[0].pid = user[1].pid;
 536 +                                       user[0].reserve = user[1].reserve;
 537 +                                       user++;
 538 +                                       i++;
 539 +                               }
 540 +                               vc_cma_reserve_count--;
 541 +                               user = NULL;
 542 +                       }
 543 +                       break;
 544 +               }
 545 +       }
 546 +
 547 +       if (reserve && !user) {
 548 +               if (vc_cma_reserve_count == VC_CMA_RESERVE_COUNT_MAX) {
 549 +                       LOG_ERR("vc-cma: Too many reservations - "
 550 +                               "increase CMA_RESERVE_COUNT_MAX");
 551 +                       up(&vc_cma_reserve_mutex);
 552 +                       return -EBUSY;
 553 +               }
 554 +               user = &vc_cma_reserve_users[vc_cma_reserve_count];
 555 +               user->pid = pid;
 556 +               user->reserve = reserve;
 557 +               delta = reserve;
 558 +               vc_cma_reserve_count++;
 559 +       }
 560 +
 561 +       vc_cma_reserve_total += delta;
 562 +
 563 +       send_vc_msg(VC_CMA_MSG_RESERVE,
 564 +                   vc_cma_reserve_total & 0xffff, vc_cma_reserve_total >> 16);
 565 +
 566 +       send_worker_msg((VCHIQ_HEADER_T *) VC_CMA_MSG_UPDATE_RESERVE);
 567 +
 568 +       LOG_DBG("/proc/vc-cma: reserve %d (PID %d) - total %u",
 569 +               reserve, pid, vc_cma_reserve_total);
 570 +
 571 +       up(&vc_cma_reserve_mutex);
 572 +
 573 +       return vc_cma_reserve_total;
 574 +}
 575 +
 576 +static VCHIQ_STATUS_T cma_service_callback(VCHIQ_REASON_T reason,
 577 +                                          VCHIQ_HEADER_T * header,
 578 +                                          VCHIQ_SERVICE_HANDLE_T service,
 579 +                                          void *bulk_userdata)
 580 +{
 581 +       switch (reason) {
 582 +       case VCHIQ_MESSAGE_AVAILABLE:
 583 +               if (!send_worker_msg(header))
 584 +                       return VCHIQ_RETRY;
 585 +               break;
 586 +       case VCHIQ_SERVICE_CLOSED:
 587 +               LOG_DBG("CMA service closed");
 588 +               break;
 589 +       default:
 590 +               LOG_ERR("Unexpected CMA callback reason %d", reason);
 591 +               break;
 592 +       }
 593 +       return VCHIQ_SUCCESS;
 594 +}
 595 +
 596 +static void send_vc_msg(unsigned short type,
 597 +                       unsigned short param1, unsigned short param2)
 598 +{
 599 +       unsigned short msg[] = { type, param1, param2 };
 600 +       VCHIQ_ELEMENT_T elem = { &msg, sizeof(msg) };
 601 +       VCHIQ_STATUS_T ret;
 602 +       vchiq_use_service(cma_service);
 603 +       ret = vchiq_queue_message(cma_service, &elem, 1);
 604 +       vchiq_release_service(cma_service);
 605 +       if (ret != VCHIQ_SUCCESS)
 606 +               LOG_ERR("vchiq_queue_message returned %x", ret);
 607 +}
 608 +
 609 +static bool send_worker_msg(VCHIQ_HEADER_T * msg)
 610 +{
 611 +       if (down_interruptible(&vc_cma_worker_queue_push_mutex))
 612 +               return false;
 613 +       vchiu_queue_push(&cma_msg_queue, msg);
 614 +       up(&vc_cma_worker_queue_push_mutex);
 615 +       return true;
 616 +}
 617 +
 618 +static int vc_cma_alloc_chunks(int num_chunks, struct cma_msg *reply)
 619 +{
 620 +       int i;
 621 +       for (i = 0; i < num_chunks; i++) {
 622 +               struct page *chunk;
 623 +               unsigned int chunk_num;
 624 +               uint8_t *chunk_addr;
 625 +               size_t chunk_size = PAGES_PER_CHUNK << PAGE_SHIFT;
 626 +
 627 +               chunk = dma_alloc_from_contiguous(NULL /*&vc_cma_device.dev*/,
 628 +                                                 PAGES_PER_CHUNK,
 629 +                                                 VC_CMA_CHUNK_ORDER);
 630 +               if (!chunk)
 631 +                       break;
 632 +
 633 +               chunk_addr = page_address(chunk);
 634 +               dmac_flush_range(chunk_addr, chunk_addr + chunk_size);
 635 +               outer_inv_range(__pa(chunk_addr), __pa(chunk_addr) +
 636 +                       chunk_size);
 637 +
 638 +               chunk_num =
 639 +                   (page_to_phys(chunk) - vc_cma_base) / VC_CMA_CHUNK_SIZE;
 640 +               BUG_ON(((page_to_phys(chunk) - vc_cma_base) %
 641 +                       VC_CMA_CHUNK_SIZE) != 0);
 642 +               if (chunk_num >= vc_cma_chunks) {
 643 +                       LOG_ERR("%s: ===============================",
 644 +                               __func__);
 645 +                       LOG_ERR("%s: chunk phys %x, vc_cma %x-%x - "
 646 +                               "bad SPARSEMEM configuration?",
 647 +                               __func__, (unsigned int)page_to_phys(chunk),
 648 +                               vc_cma_base, vc_cma_base + vc_cma_size - 1);
 649 +                       LOG_ERR("%s: dev->cma_area = %p\n", __func__,
 650 +                               (void*)0/*vc_cma_device.dev.cma_area*/);
 651 +                       LOG_ERR("%s: ===============================",
 652 +                               __func__);
 653 +                       break;
 654 +               }
 655 +               reply->params[i] = chunk_num;
 656 +               vc_cma_chunks_used++;
 657 +       }
 658 +
 659 +       if (i < num_chunks) {
 660 +               LOG_ERR("%s: dma_alloc_from_contiguous failed "
 661 +                       "for %x bytes (alloc %d of %d, %d free)",
 662 +                       __func__, VC_CMA_CHUNK_SIZE, i,
 663 +                       num_chunks, vc_cma_chunks - vc_cma_chunks_used);
 664 +               num_chunks = i;
 665 +       }
 666 +
 667 +       LOG_DBG("CMA allocated %d chunks -> %d used",
 668 +               num_chunks, vc_cma_chunks_used);
 669 +       reply->type = VC_CMA_MSG_ALLOCATED;
 670 +
 671 +       {
 672 +               VCHIQ_ELEMENT_T elem = {
 673 +                       reply,
 674 +                       offsetof(struct cma_msg, params[0]) +
 675 +                           num_chunks * sizeof(reply->params[0])
 676 +               };
 677 +               VCHIQ_STATUS_T ret;
 678 +               vchiq_use_service(cma_service);
 679 +               ret = vchiq_queue_message(cma_service, &elem, 1);
 680 +               vchiq_release_service(cma_service);
 681 +               if (ret != VCHIQ_SUCCESS)
 682 +                       LOG_ERR("vchiq_queue_message return " "%x", ret);
 683 +       }
 684 +
 685 +       return num_chunks;
 686 +}
 687 +
 688 +static int cma_worker_proc(void *param)
 689 +{
 690 +       static struct cma_msg reply;
 691 +       (void)param;
 692 +
 693 +       while (1) {
 694 +               VCHIQ_HEADER_T *msg;
 695 +               static struct cma_msg msg_copy;
 696 +               struct cma_msg *cma_msg = &msg_copy;
 697 +               int type, msg_size;
 698 +
 699 +               msg = vchiu_queue_pop(&cma_msg_queue);
 700 +               if ((unsigned int)msg >= VC_CMA_MSG_MAX) {
 701 +                       msg_size = msg->size;
 702 +                       memcpy(&msg_copy, msg->data, msg_size);
 703 +                       type = cma_msg->type;
 704 +                       vchiq_release_message(cma_service, msg);
 705 +               } else {
 706 +                       msg_size = 0;
 707 +                       type = (int)msg;
 708 +                       if (type == VC_CMA_MSG_QUIT)
 709 +                               break;
 710 +                       else if (type == VC_CMA_MSG_UPDATE_RESERVE) {
 711 +                               msg = NULL;
 712 +                               cma_msg = NULL;
 713 +                       } else {
 714 +                               BUG();
 715 +                               continue;
 716 +                       }
 717 +               }
 718 +
 719 +               switch (type) {
 720 +               case VC_CMA_MSG_ALLOC:{
 721 +                               int num_chunks, free_chunks;
 722 +                               num_chunks = cma_msg->params[0];
 723 +                               free_chunks =
 724 +                                   vc_cma_chunks - vc_cma_chunks_used;
 725 +                               LOG_DBG("CMA_MSG_ALLOC(%d chunks)", num_chunks);
 726 +                               if (num_chunks > VC_CMA_MAX_PARAMS_PER_MSG) {
 727 +                                       LOG_ERR
 728 +                                           ("CMA_MSG_ALLOC - chunk count (%d) "
 729 +                                            "exceeds VC_CMA_MAX_PARAMS_PER_MSG (%d)",
 730 +                                            num_chunks,
 731 +                                            VC_CMA_MAX_PARAMS_PER_MSG);
 732 +                                       num_chunks = VC_CMA_MAX_PARAMS_PER_MSG;
 733 +                               }
 734 +
 735 +                               if (num_chunks > free_chunks) {
 736 +                                       LOG_ERR
 737 +                                           ("CMA_MSG_ALLOC - chunk count (%d) "
 738 +                                            "exceeds free chunks (%d)",
 739 +                                            num_chunks, free_chunks);
 740 +                                       num_chunks = free_chunks;
 741 +                               }
 742 +
 743 +                               vc_cma_alloc_chunks(num_chunks, &reply);
 744 +                       }
 745 +                       break;
 746 +
 747 +               case VC_CMA_MSG_FREE:{
 748 +                               int chunk_count =
 749 +                                   (msg_size -
 750 +                                    offsetof(struct cma_msg,
 751 +                                             params)) /
 752 +                                   sizeof(cma_msg->params[0]);
 753 +                               int i;
 754 +                               BUG_ON(chunk_count <= 0);
 755 +
 756 +                               LOG_DBG("CMA_MSG_FREE(%d chunks - %x, ...)",
 757 +                                       chunk_count, cma_msg->params[0]);
 758 +                               for (i = 0; i < chunk_count; i++) {
 759 +                                       int chunk_num = cma_msg->params[i];
 760 +                                       struct page *page = vc_cma_base_page +
 761 +                                           chunk_num * PAGES_PER_CHUNK;
 762 +                                       if (chunk_num >= vc_cma_chunks) {
 763 +                                               LOG_ERR
 764 +                                                   ("CMA_MSG_FREE - chunk %d of %d"
 765 +                                                    " (value %x) exceeds maximum "
 766 +                                                    "(%x)", i, chunk_count,
 767 +                                                    chunk_num,
 768 +                                                    vc_cma_chunks - 1);
 769 +                                               break;
 770 +                                       }
 771 +
 772 +                                       if (!dma_release_from_contiguous
 773 +                                           (NULL /*&vc_cma_device.dev*/, page,
 774 +                                            PAGES_PER_CHUNK)) {
 775 +                                               LOG_ERR
 776 +                                                   ("CMA_MSG_FREE - failed to "
 777 +                                                    "release chunk %d (phys %x, "
 778 +                                                    "page %x)", chunk_num,
 779 +                                                    page_to_phys(page),
 780 +                                                    (unsigned int)page);
 781 +                                       }
 782 +                                       vc_cma_chunks_used--;
 783 +                               }
 784 +                               LOG_DBG("CMA released %d chunks -> %d used",
 785 +                                       i, vc_cma_chunks_used);
 786 +                       }
 787 +                       break;
 788 +
 789 +               case VC_CMA_MSG_UPDATE_RESERVE:{
 790 +                               int chunks_needed =
 791 +                                   ((vc_cma_reserve_total + VC_CMA_CHUNK_SIZE -
 792 +                                     1)
 793 +                                    / VC_CMA_CHUNK_SIZE) -
 794 +                                   vc_cma_chunks_reserved;
 795 +
 796 +                               LOG_DBG
 797 +                                   ("CMA_MSG_UPDATE_RESERVE(%d chunks needed)",
 798 +                                    chunks_needed);
 799 +
 800 +                               /* Cap the reservations to what is available */
 801 +                               if (chunks_needed > 0) {
 802 +                                       if (chunks_needed >
 803 +                                           (vc_cma_chunks -
 804 +                                            vc_cma_chunks_used))
 805 +                                               chunks_needed =
 806 +                                                   (vc_cma_chunks -
 807 +                                                    vc_cma_chunks_used);
 808 +
 809 +                                       chunks_needed =
 810 +                                           vc_cma_alloc_chunks(chunks_needed,
 811 +                                                               &reply);
 812 +                               }
 813 +
 814 +                               LOG_DBG
 815 +                                   ("CMA_MSG_UPDATE_RESERVE(%d chunks allocated)",
 816 +                                    chunks_needed);
 817 +                               vc_cma_chunks_reserved += chunks_needed;
 818 +                       }
 819 +                       break;
 820 +
 821 +               default:
 822 +                       LOG_ERR("unexpected msg type %d", type);
 823 +                       break;
 824 +               }
 825 +       }
 826 +
 827 +       LOG_DBG("quitting...");
 828 +       return 0;
 829 +}
 830 +
 831 +/****************************************************************************
 832 +*
 833 +*   vc_cma_connected_init
 834 +*
 835 +*   This function is called once the videocore has been connected.
 836 +*
 837 +***************************************************************************/
 838 +
 839 +static void vc_cma_connected_init(void)
 840 +{
 841 +       VCHIQ_SERVICE_PARAMS_T service_params;
 842 +
 843 +       LOG_DBG("vc_cma_connected_init");
 844 +
 845 +       if (!vchiu_queue_init(&cma_msg_queue, 16)) {
 846 +               LOG_ERR("could not create CMA msg queue");
 847 +               goto fail_queue;
 848 +       }
 849 +
 850 +       if (vchiq_initialise(&cma_instance) != VCHIQ_SUCCESS)
 851 +               goto fail_vchiq_init;
 852 +
 853 +       vchiq_connect(cma_instance);
 854 +
 855 +       service_params.fourcc = VC_CMA_FOURCC;
 856 +       service_params.callback = cma_service_callback;
 857 +       service_params.userdata = NULL;
 858 +       service_params.version = VC_CMA_VERSION;
 859 +       service_params.version_min = VC_CMA_VERSION;
 860 +
 861 +       if (vchiq_open_service(cma_instance, &service_params,
 862 +                              &cma_service) != VCHIQ_SUCCESS) {
 863 +               LOG_ERR("failed to open service - already in use?");
 864 +               goto fail_vchiq_open;
 865 +       }
 866 +
 867 +       vchiq_release_service(cma_service);
 868 +
 869 +       cma_worker = kthread_create(cma_worker_proc, NULL, "cma_worker");
 870 +       if (!cma_worker) {
 871 +               LOG_ERR("could not create CMA worker thread");
 872 +               goto fail_worker;
 873 +       }
 874 +       set_user_nice(cma_worker, -20);
 875 +       wake_up_process(cma_worker);
 876 +
 877 +       return;
 878 +
 879 +fail_worker:
 880 +       vchiq_close_service(cma_service);
 881 +fail_vchiq_open:
 882 +       vchiq_shutdown(cma_instance);
 883 +fail_vchiq_init:
 884 +       vchiu_queue_delete(&cma_msg_queue);
 885 +fail_queue:
 886 +       return;
 887 +}
 888 +
 889 +void
 890 +loud_error_header(void)
 891 +{
 892 +       if (in_loud_error)
 893 +               return;
 894 +
 895 +       LOG_ERR("============================================================"
 896 +               "================");
 897 +       LOG_ERR("============================================================"
 898 +               "================");
 899 +       LOG_ERR("=====");
 900 +
 901 +       in_loud_error = 1;
 902 +}
 903 +
 904 +void
 905 +loud_error_footer(void)
 906 +{
 907 +       if (!in_loud_error)
 908 +               return;
 909 +
 910 +       LOG_ERR("=====");
 911 +       LOG_ERR("============================================================"
 912 +               "================");
 913 +       LOG_ERR("============================================================"
 914 +               "================");
 915 +
 916 +       in_loud_error = 0;
 917 +}
 918 +
 919 +#if 1
 920 +static int check_cma_config(void) { return 1; }
 921 +#else
 922 +static int
 923 +read_vc_debug_var(VC_MEM_ACCESS_HANDLE_T handle,
 924 +       const char *symbol,
 925 +       void *buf, size_t bufsize)
 926 +{
 927 +       VC_MEM_ADDR_T vcMemAddr;
 928 +       size_t vcMemSize;
 929 +       uint8_t *mapAddr;
 930 +       off_t  vcMapAddr;
 931 +
 932 +       if (!LookupVideoCoreSymbol(handle, symbol,
 933 +               &vcMemAddr,
 934 +               &vcMemSize)) {
 935 +               loud_error_header();
 936 +               loud_error(
 937 +                       "failed to find VC symbol \"%s\".",
 938 +                       symbol);
 939 +               loud_error_footer();
 940 +               return 0;
 941 +       }
 942 +
 943 +       if (vcMemSize != bufsize) {
 944 +               loud_error_header();
 945 +               loud_error(
 946 +                       "VC symbol \"%s\" is the wrong size.",
 947 +                       symbol);
 948 +               loud_error_footer();
 949 +               return 0;
 950 +       }
 951 +
 952 +       vcMapAddr = (off_t)vcMemAddr & VC_MEM_TO_ARM_ADDR_MASK;
 953 +       vcMapAddr += mm_vc_mem_phys_addr;
 954 +       mapAddr = ioremap_nocache(vcMapAddr, vcMemSize);
 955 +       if (mapAddr == 0) {
 956 +               loud_error_header();
 957 +               loud_error(
 958 +                       "failed to ioremap \"%s\" @ 0x%x "
 959 +                       "(phys: 0x%x, size: %u).",
 960 +                       symbol,
 961 +                       (unsigned int)vcMapAddr,
 962 +                       (unsigned int)vcMemAddr,
 963 +                       (unsigned int)vcMemSize);
 964 +               loud_error_footer();
 965 +               return 0;
 966 +       }
 967 +
 968 +       memcpy(buf, mapAddr, bufsize);
 969 +       iounmap(mapAddr);
 970 +
 971 +       return 1;
 972 +}
 973 +
 974 +
 975 +static int
 976 +check_cma_config(void)
 977 +{
 978 +       VC_MEM_ACCESS_HANDLE_T mem_hndl;
 979 +       VC_MEM_ADDR_T mempool_start;
 980 +       VC_MEM_ADDR_T mempool_end;
 981 +       VC_MEM_ADDR_T mempool_offline_start;
 982 +       VC_MEM_ADDR_T mempool_offline_end;
 983 +       VC_MEM_ADDR_T cam_alloc_base;
 984 +       VC_MEM_ADDR_T cam_alloc_size;
 985 +       VC_MEM_ADDR_T cam_alloc_end;
 986 +       int success = 0;
 987 +
 988 +       if (OpenVideoCoreMemory(&mem_hndl) != 0)
 989 +               goto out;
 990 +
 991 +       /* Read the relevant VideoCore variables */
 992 +       if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_START",
 993 +               &mempool_start,
 994 +               sizeof(mempool_start)))
 995 +               goto close;
 996 +
 997 +       if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_END",
 998 +               &mempool_end,
 999 +               sizeof(mempool_end)))
1000 +               goto close;
1001 +
1002 +       if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_OFFLINE_START",
1003 +               &mempool_offline_start,
1004 +               sizeof(mempool_offline_start)))
1005 +               goto close;
1006 +
1007 +       if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_OFFLINE_END",
1008 +               &mempool_offline_end,
1009 +               sizeof(mempool_offline_end)))
1010 +               goto close;
1011 +
1012 +       if (!read_vc_debug_var(mem_hndl, "cam_alloc_base",
1013 +               &cam_alloc_base,
1014 +               sizeof(cam_alloc_base)))
1015 +               goto close;
1016 +
1017 +       if (!read_vc_debug_var(mem_hndl, "cam_alloc_size",
1018 +               &cam_alloc_size,
1019 +               sizeof(cam_alloc_size)))
1020 +               goto close;
1021 +
1022 +       cam_alloc_end = cam_alloc_base + cam_alloc_size;
1023 +
1024 +       success = 1;
1025 +
1026 +       /* Now the sanity checks */
1027 +       if (!mempool_offline_start)
1028 +               mempool_offline_start = mempool_start;
1029 +       if (!mempool_offline_end)
1030 +               mempool_offline_end = mempool_end;
1031 +
1032 +       if (VCADDR_TO_PHYSADDR(mempool_offline_start) != vc_cma_base) {
1033 +               loud_error_header();
1034 +               loud_error(
1035 +                       "__MEMPOOL_OFFLINE_START(%x -> %lx) doesn't match "
1036 +                       "vc_cma_base(%x)",
1037 +                       mempool_offline_start,
1038 +                       VCADDR_TO_PHYSADDR(mempool_offline_start),
1039 +                       vc_cma_base);
1040 +               success = 0;
1041 +       }
1042 +
1043 +       if (VCADDR_TO_PHYSADDR(mempool_offline_end) !=
1044 +               (vc_cma_base + vc_cma_size)) {
1045 +               loud_error_header();
1046 +               loud_error(
1047 +                       "__MEMPOOL_OFFLINE_END(%x -> %lx) doesn't match "
1048 +                       "vc_cma_base(%x) + vc_cma_size(%x) = %x",
1049 +                       mempool_offline_start,
1050 +                       VCADDR_TO_PHYSADDR(mempool_offline_end),
1051 +                       vc_cma_base, vc_cma_size, vc_cma_base + vc_cma_size);
1052 +               success = 0;
1053 +       }
1054 +
1055 +       if (mempool_end < mempool_start) {
1056 +               loud_error_header();
1057 +               loud_error(
1058 +                       "__MEMPOOL_END(%x) must not be before "
1059 +                       "__MEMPOOL_START(%x)",
1060 +                       mempool_end,
1061 +                       mempool_start);
1062 +               success = 0;
1063 +       }
1064 +
1065 +       if (mempool_offline_end < mempool_offline_start) {
1066 +               loud_error_header();
1067 +               loud_error(
1068 +                       "__MEMPOOL_OFFLINE_END(%x) must not be before "
1069 +                       "__MEMPOOL_OFFLINE_START(%x)",
1070 +                       mempool_offline_end,
1071 +                       mempool_offline_start);
1072 +               success = 0;
1073 +       }
1074 +
1075 +       if (mempool_offline_start < mempool_start) {
1076 +               loud_error_header();
1077 +               loud_error(
1078 +                       "__MEMPOOL_OFFLINE_START(%x) must not be before "
1079 +                       "__MEMPOOL_START(%x)",
1080 +                       mempool_offline_start,
1081 +                       mempool_start);
1082 +               success = 0;
1083 +       }
1084 +
1085 +       if (mempool_offline_end > mempool_end) {
1086 +               loud_error_header();
1087 +               loud_error(
1088 +                       "__MEMPOOL_OFFLINE_END(%x) must not be after "
1089 +                       "__MEMPOOL_END(%x)",
1090 +                       mempool_offline_end,
1091 +                       mempool_end);
1092 +               success = 0;
1093 +       }
1094 +
1095 +       if ((cam_alloc_base < mempool_end) &&
1096 +               (cam_alloc_end > mempool_start)) {
1097 +               loud_error_header();
1098 +               loud_error(
1099 +                       "cam_alloc pool(%x-%x) overlaps "
1100 +                       "mempool(%x-%x)",
1101 +                       cam_alloc_base, cam_alloc_end,
1102 +                       mempool_start, mempool_end);
1103 +               success = 0;
1104 +       }
1105 +
1106 +       loud_error_footer();
1107 +
1108 +close:
1109 +       CloseVideoCoreMemory(mem_hndl);
1110 +
1111 +out:
1112 +       return success;
1113 +}
1114 +#endif
1115 +
1116 +static int vc_cma_init(void)
1117 +{
1118 +       int rc = -EFAULT;
1119 +       struct device *dev;
1120 +
1121 +       if (!check_cma_config())
1122 +               goto out_release;
1123 +
1124 +       printk(KERN_INFO "vc-cma: Videocore CMA driver\n");
1125 +       printk(KERN_INFO "vc-cma: vc_cma_base      = 0x%08x\n", vc_cma_base);
1126 +       printk(KERN_INFO "vc-cma: vc_cma_size      = 0x%08x (%u MiB)\n",
1127 +              vc_cma_size, vc_cma_size / (1024 * 1024));
1128 +       printk(KERN_INFO "vc-cma: vc_cma_initial   = 0x%08x (%u MiB)\n",
1129 +              vc_cma_initial, vc_cma_initial / (1024 * 1024));
1130 +
1131 +       vc_cma_base_page = phys_to_page(vc_cma_base);
1132 +
1133 +       if (vc_cma_chunks) {
1134 +               int chunks_needed = vc_cma_initial / VC_CMA_CHUNK_SIZE;
1135 +
1136 +               for (vc_cma_chunks_used = 0;
1137 +                    vc_cma_chunks_used < chunks_needed; vc_cma_chunks_used++) {
1138 +                       struct page *chunk;
1139 +                       chunk = dma_alloc_from_contiguous(NULL /*&vc_cma_device.dev*/,
1140 +                                                         PAGES_PER_CHUNK,
1141 +                                                         VC_CMA_CHUNK_ORDER);
1142 +                       if (!chunk)
1143 +                               break;
1144 +                       BUG_ON(((page_to_phys(chunk) - vc_cma_base) %
1145 +                               VC_CMA_CHUNK_SIZE) != 0);
1146 +               }
1147 +               if (vc_cma_chunks_used != chunks_needed) {
1148 +                       LOG_ERR("%s: dma_alloc_from_contiguous failed (%d "
1149 +                               "bytes, allocation %d of %d)",
1150 +                               __func__, VC_CMA_CHUNK_SIZE,
1151 +                               vc_cma_chunks_used, chunks_needed);
1152 +                       goto out_release;
1153 +               }
1154 +
1155 +               vchiq_add_connected_callback(vc_cma_connected_init);
1156 +       }
1157 +
1158 +       rc = alloc_chrdev_region(&vc_cma_devnum, 0, 1, DRIVER_NAME);
1159 +       if (rc < 0) {
1160 +               LOG_ERR("%s: alloc_chrdev_region failed (rc=%d)", __func__, rc);
1161 +               goto out_release;
1162 +       }
1163 +
1164 +       cdev_init(&vc_cma_cdev, &vc_cma_fops);
1165 +       rc = cdev_add(&vc_cma_cdev, vc_cma_devnum, 1);
1166 +       if (rc != 0) {
1167 +               LOG_ERR("%s: cdev_add failed (rc=%d)", __func__, rc);
1168 +               goto out_unregister;
1169 +       }
1170 +
1171 +       vc_cma_class = class_create(THIS_MODULE, DRIVER_NAME);
1172 +       if (IS_ERR(vc_cma_class)) {
1173 +               rc = PTR_ERR(vc_cma_class);
1174 +               LOG_ERR("%s: class_create failed (rc=%d)", __func__, rc);
1175 +               goto out_cdev_del;
1176 +       }
1177 +
1178 +       dev = device_create(vc_cma_class, NULL, vc_cma_devnum, NULL,
1179 +                           DRIVER_NAME);
1180 +       if (IS_ERR(dev)) {
1181 +               rc = PTR_ERR(dev);
1182 +               LOG_ERR("%s: device_create failed (rc=%d)", __func__, rc);
1183 +               goto out_class_destroy;
1184 +       }
1185 +
1186 +       vc_cma_proc_entry = proc_create(DRIVER_NAME, 0444, NULL, &vc_cma_proc_fops);
1187 +       if (vc_cma_proc_entry == NULL) {
1188 +               rc = -EFAULT;
1189 +               LOG_ERR("%s: proc_create failed", __func__);
1190 +               goto out_device_destroy;
1191 +       }
1192 +
1193 +       vc_cma_inited = 1;
1194 +       return 0;
1195 +
1196 +out_device_destroy:
1197 +       device_destroy(vc_cma_class, vc_cma_devnum);
1198 +
1199 +out_class_destroy:
1200 +       class_destroy(vc_cma_class);
1201 +       vc_cma_class = NULL;
1202 +
1203 +out_cdev_del:
1204 +       cdev_del(&vc_cma_cdev);
1205 +
1206 +out_unregister:
1207 +       unregister_chrdev_region(vc_cma_devnum, 1);
1208 +
1209 +out_release:
1210 +       /* It is tempting to try to clean up by calling
1211 +          dma_release_from_contiguous for all allocated chunks, but it isn't
1212 +          a very safe thing to do. If vc_cma_initial is non-zero it is because
1213 +          VideoCore is already using that memory, so giving it back to Linux
1214 +          is likely to be fatal.
1215 +        */
1216 +       return -1;
1217 +}
1218 +
1219 +/****************************************************************************
1220 +*
1221 +*   vc_cma_exit
1222 +*
1223 +***************************************************************************/
1224 +
1225 +static void __exit vc_cma_exit(void)
1226 +{
1227 +       LOG_DBG("%s: called", __func__);
1228 +
1229 +       if (vc_cma_inited) {
1230 +               remove_proc_entry(DRIVER_NAME, NULL);
1231 +               device_destroy(vc_cma_class, vc_cma_devnum);
1232 +               class_destroy(vc_cma_class);
1233 +               cdev_del(&vc_cma_cdev);
1234 +               unregister_chrdev_region(vc_cma_devnum, 1);
1235 +       }
1236 +}
1237 +
1238 +module_init(vc_cma_init);
1239 +module_exit(vc_cma_exit);
1240 +MODULE_LICENSE("GPL");
1241 +MODULE_AUTHOR("Broadcom Corporation");
1242 diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
1243 index c085ede..43d2ac9 100644
1244 --- a/drivers/misc/Makefile
1245 +++ b/drivers/misc/Makefile
1246 @@ -51,7 +51,7 @@ obj-$(CONFIG_INTEL_MEI)               += mei/
1247  obj-$(CONFIG_VMWARE_VMCI)      += vmw_vmci/
1248  obj-$(CONFIG_LATTICE_ECP3_CONFIG)      += lattice-ecp3-config.o
1249  obj-$(CONFIG_SRAM)             += sram.o
1250 -obj-y                          += vc04_services/
1251 +obj-$(CONFIG_BCM2708_VCHIQ)    += vc04_services/
1252  obj-y                          += mic/
1253  obj-$(CONFIG_GENWQE)           += genwqe/
1254  obj-$(CONFIG_ECHO)             += echo/
1255 diff --git a/include/linux/broadcom/vc_cma.h b/include/linux/broadcom/vc_cma.h
1256 new file mode 100644
1257 index 0000000..5325832
1258 --- /dev/null
1259 +++ b/include/linux/broadcom/vc_cma.h
1260 @@ -0,0 +1,29 @@
1261 +/*****************************************************************************
1262 +* Copyright 2012 Broadcom Corporation.  All rights reserved.
1263 +*
1264 +* Unless you and Broadcom execute a separate written software license
1265 +* agreement governing use of this software, this software is licensed to you
1266 +* under the terms of the GNU General Public License version 2, available at
1267 +* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
1268 +*
1269 +* Notwithstanding the above, under no circumstances may you combine this
1270 +* software in any way with any other Broadcom software provided under a
1271 +* license other than the GPL, without Broadcom's express prior written
1272 +* consent.
1273 +*****************************************************************************/
1274 +
1275 +#if !defined( VC_CMA_H )
1276 +#define VC_CMA_H
1277 +
1278 +#include <linux/ioctl.h>
1279 +
1280 +#define VC_CMA_IOC_MAGIC 0xc5
1281 +
1282 +#define VC_CMA_IOC_RESERVE _IO(VC_CMA_IOC_MAGIC, 0)
1283 +
1284 +#ifdef __KERNEL__
1285 +extern void __init vc_cma_early_init(void);
1286 +extern void __init vc_cma_reserve(void);
1287 +#endif
1288 +
1289 +#endif /* VC_CMA_H */
1290 --
1291 1.8.3.2
1292