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