target/linux/brcm2708/patches-4.9/0037-cma-Add-vc_cma-driver-to-enable-use-of-CMA.patch

   1 From 4d96064d4c95d73d22563cea403eccd72e7b0da0 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] cma: Add vc_cma driver to enable use of CMA
   5 MIME-Version: 1.0
   6 Content-Type: text/plain; charset=UTF-8
   7 Content-Transfer-Encoding: 8bit
   8
   9 Signed-off-by: popcornmix <popcornmix@gmail.com>
  10
  11 vc_cma: Make the vc_cma area the default contiguous DMA area
  12
  13 vc_cma: Provide empty functions when module is not built
  14
  15 Providing empty functions saves the users from guarding the
  16 function call with an #if clause.
  17 Move __init markings from prototypes to functions.
  18
  19 Signed-off-by: Noralf Trønnes <noralf@tronnes.org>
  20 ---
  21  drivers/char/Kconfig                  |    2 +
  22  drivers/char/Makefile                 |    1 +
  23  drivers/char/broadcom/Kconfig         |   15 +
  24  drivers/char/broadcom/Makefile        |    1 +
  25  drivers/char/broadcom/vc_cma/Makefile |    7 +
  26  drivers/char/broadcom/vc_cma/vc_cma.c | 1193 +++++++++++++++++++++++++++++++++
  27  include/linux/broadcom/vc_cma.h       |   36 +
  28  7 files changed, 1255 insertions(+)
  29  create mode 100644 drivers/char/broadcom/Kconfig
  30  create mode 100644 drivers/char/broadcom/Makefile
  31  create mode 100644 drivers/char/broadcom/vc_cma/Makefile
  32  create mode 100644 drivers/char/broadcom/vc_cma/vc_cma.c
  33  create mode 100644 include/linux/broadcom/vc_cma.h
  34
  35 --- a/drivers/char/Kconfig
  36 +++ b/drivers/char/Kconfig
  37 @@ -4,6 +4,8 @@
  38
  39  menu "Character devices"
  40
  41 +source "drivers/char/broadcom/Kconfig"
  42 +
  43  source "drivers/tty/Kconfig"
  44
  45  config DEVMEM
  46 --- a/drivers/char/Makefile
  47 +++ b/drivers/char/Makefile
  48 @@ -60,3 +60,4 @@ js-rtc-y = rtc.o
  49  obj-$(CONFIG_TILE_SROM)                += tile-srom.o
  50  obj-$(CONFIG_XILLYBUS)         += xillybus/
  51  obj-$(CONFIG_POWERNV_OP_PANEL) += powernv-op-panel.o
  52 +obj-$(CONFIG_BRCM_CHAR_DRIVERS) += broadcom/
  53 --- /dev/null
  54 +++ b/drivers/char/broadcom/Kconfig
  55 @@ -0,0 +1,15 @@
  56 +#
  57 +# Broadcom char driver config
  58 +#
  59 +
  60 +menuconfig BRCM_CHAR_DRIVERS
  61 +       bool "Broadcom Char Drivers"
  62 +       help
  63 +         Broadcom's char drivers
  64 +
  65 +config BCM_VC_CMA
  66 +       bool "Videocore CMA"
  67 +       depends on CMA && BRCM_CHAR_DRIVERS && BCM2708_VCHIQ
  68 +       default n
  69 +        help
  70 +          Helper for videocore CMA access.
  71 --- /dev/null
  72 +++ b/drivers/char/broadcom/Makefile
  73 @@ -0,0 +1 @@
  74 +obj-$(CONFIG_BCM_VC_CMA)       += vc_cma/
  75 --- /dev/null
  76 +++ b/drivers/char/broadcom/vc_cma/Makefile
  77 @@ -0,0 +1,7 @@
  78 +ccflags-$(CONFIG_BCM_VC_CMA)  += -Wall -Wstrict-prototypes -Wno-trigraphs -Werror
  79 +ccflags-$(CONFIG_BCM_VC_CMA)  += -Iinclude/linux/broadcom -Idrivers/staging/vc04_services -Idrivers/staging/vc04_services/interface/vchi -Idrivers/staging/vc04_services/interface/vchiq_arm
  80 +ccflags-$(CONFIG_BCM_VC_CMA)  += -D__KERNEL__ -D__linux__
  81 +
  82 +obj-$(CONFIG_BCM_VC_CMA) += vc-cma.o
  83 +
  84 +vc-cma-objs := vc_cma.o
  85 --- /dev/null
  86 +++ b/drivers/char/broadcom/vc_cma/vc_cma.c
  87 @@ -0,0 +1,1193 @@
  88 +/**
  89 + * Copyright (c) 2010-2012 Broadcom. All rights reserved.
  90 + *
  91 + * Redistribution and use in source and binary forms, with or without
  92 + * modification, are permitted provided that the following conditions
  93 + * are met:
  94 + * 1. Redistributions of source code must retain the above copyright
  95 + *    notice, this list of conditions, and the following disclaimer,
  96 + *    without modification.
  97 + * 2. Redistributions in binary form must reproduce the above copyright
  98 + *    notice, this list of conditions and the following disclaimer in the
  99 + *    documentation and/or other materials provided with the distribution.
 100 + * 3. The names of the above-listed copyright holders may not be used
 101 + *    to endorse or promote products derived from this software without
 102 + *    specific prior written permission.
 103 + *
 104 + * ALTERNATIVELY, this software may be distributed under the terms of the
 105 + * GNU General Public License ("GPL") version 2, as published by the Free
 106 + * Software Foundation.
 107 + *
 108 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 109 + * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 110 + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 111 + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 112 + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 113 + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 114 + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 115 + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 116 + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 117 + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 118 + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 119 + */
 120 +
 121 +#include <linux/kernel.h>
 122 +#include <linux/module.h>
 123 +#include <linux/kthread.h>
 124 +#include <linux/fs.h>
 125 +#include <linux/device.h>
 126 +#include <linux/cdev.h>
 127 +#include <linux/mm.h>
 128 +#include <linux/proc_fs.h>
 129 +#include <linux/seq_file.h>
 130 +#include <linux/dma-mapping.h>
 131 +#include <linux/dma-contiguous.h>
 132 +#include <linux/platform_device.h>
 133 +#include <linux/uaccess.h>
 134 +#include <asm/cacheflush.h>
 135 +
 136 +#include "vc_cma.h"
 137 +
 138 +#include "vchiq_util.h"
 139 +#include "vchiq_connected.h"
 140 +//#include "debug_sym.h"
 141 +//#include "vc_mem.h"
 142 +
 143 +#define DRIVER_NAME  "vc-cma"
 144 +
 145 +#define LOG_DBG(fmt, ...) \
 146 +       if (vc_cma_debug) \
 147 +               printk(KERN_INFO fmt "\n", ##__VA_ARGS__)
 148 +#define LOG_INFO(fmt, ...) \
 149 +       printk(KERN_INFO fmt "\n", ##__VA_ARGS__)
 150 +#define LOG_ERR(fmt, ...) \
 151 +       printk(KERN_ERR fmt "\n", ##__VA_ARGS__)
 152 +
 153 +#define VC_CMA_FOURCC VCHIQ_MAKE_FOURCC('C', 'M', 'A', ' ')
 154 +#define VC_CMA_VERSION 2
 155 +
 156 +#define VC_CMA_CHUNK_ORDER 6   /* 256K */
 157 +#define VC_CMA_CHUNK_SIZE (4096 << VC_CMA_CHUNK_ORDER)
 158 +#define VC_CMA_MAX_PARAMS_PER_MSG \
 159 +       ((VCHIQ_MAX_MSG_SIZE - sizeof(unsigned short))/sizeof(unsigned short))
 160 +#define VC_CMA_RESERVE_COUNT_MAX 16
 161 +
 162 +#define PAGES_PER_CHUNK (VC_CMA_CHUNK_SIZE / PAGE_SIZE)
 163 +
 164 +#define VCADDR_TO_PHYSADDR(vcaddr) (mm_vc_mem_phys_addr + vcaddr)
 165 +
 166 +#define loud_error(...) \
 167 +       LOG_ERR("===== " __VA_ARGS__)
 168 +
 169 +enum {
 170 +       VC_CMA_MSG_QUIT,
 171 +       VC_CMA_MSG_OPEN,
 172 +       VC_CMA_MSG_TICK,
 173 +       VC_CMA_MSG_ALLOC,       /* chunk count */
 174 +       VC_CMA_MSG_FREE,        /* chunk, chunk, ... */
 175 +       VC_CMA_MSG_ALLOCATED,   /* chunk, chunk, ... */
 176 +       VC_CMA_MSG_REQUEST_ALLOC,       /* chunk count */
 177 +       VC_CMA_MSG_REQUEST_FREE,        /* chunk count */
 178 +       VC_CMA_MSG_RESERVE,     /* bytes lo, bytes hi */
 179 +       VC_CMA_MSG_UPDATE_RESERVE,
 180 +       VC_CMA_MSG_MAX
 181 +};
 182 +
 183 +struct cma_msg {
 184 +       unsigned short type;
 185 +       unsigned short params[VC_CMA_MAX_PARAMS_PER_MSG];
 186 +};
 187 +
 188 +struct vc_cma_reserve_user {
 189 +       unsigned int pid;
 190 +       unsigned int reserve;
 191 +};
 192 +
 193 +/* Device (/dev) related variables */
 194 +static dev_t vc_cma_devnum;
 195 +static struct class *vc_cma_class;
 196 +static struct cdev vc_cma_cdev;
 197 +static int vc_cma_inited;
 198 +static int vc_cma_debug;
 199 +
 200 +/* Proc entry */
 201 +static struct proc_dir_entry *vc_cma_proc_entry;
 202 +
 203 +phys_addr_t vc_cma_base;
 204 +struct page *vc_cma_base_page;
 205 +unsigned int vc_cma_size;
 206 +EXPORT_SYMBOL(vc_cma_size);
 207 +unsigned int vc_cma_initial;
 208 +unsigned int vc_cma_chunks;
 209 +unsigned int vc_cma_chunks_used;
 210 +unsigned int vc_cma_chunks_reserved;
 211 +
 212 +
 213 +void *vc_cma_dma_alloc;
 214 +unsigned int vc_cma_dma_size;
 215 +
 216 +static int in_loud_error;
 217 +
 218 +unsigned int vc_cma_reserve_total;
 219 +unsigned int vc_cma_reserve_count;
 220 +struct vc_cma_reserve_user vc_cma_reserve_users[VC_CMA_RESERVE_COUNT_MAX];
 221 +static DEFINE_SEMAPHORE(vc_cma_reserve_mutex);
 222 +static DEFINE_SEMAPHORE(vc_cma_worker_queue_push_mutex);
 223 +
 224 +static u64 vc_cma_dma_mask = DMA_BIT_MASK(32);
 225 +static struct platform_device vc_cma_device = {
 226 +       .name = "vc-cma",
 227 +       .id = 0,
 228 +       .dev = {
 229 +               .dma_mask = &vc_cma_dma_mask,
 230 +               .coherent_dma_mask = DMA_BIT_MASK(32),
 231 +               },
 232 +};
 233 +
 234 +static VCHIQ_INSTANCE_T cma_instance;
 235 +static VCHIQ_SERVICE_HANDLE_T cma_service;
 236 +static VCHIU_QUEUE_T cma_msg_queue;
 237 +static struct task_struct *cma_worker;
 238 +
 239 +static int vc_cma_set_reserve(unsigned int reserve, unsigned int pid);
 240 +static int vc_cma_alloc_chunks(int num_chunks, struct cma_msg *reply);
 241 +static VCHIQ_STATUS_T cma_service_callback(VCHIQ_REASON_T reason,
 242 +                                          VCHIQ_HEADER_T * header,
 243 +                                          VCHIQ_SERVICE_HANDLE_T service,
 244 +                                          void *bulk_userdata);
 245 +static void send_vc_msg(unsigned short type,
 246 +                       unsigned short param1, unsigned short param2);
 247 +static bool send_worker_msg(VCHIQ_HEADER_T * msg);
 248 +
 249 +static int early_vc_cma_mem(char *p)
 250 +{
 251 +       unsigned int new_size;
 252 +       printk(KERN_NOTICE "early_vc_cma_mem(%s)", p);
 253 +       vc_cma_size = memparse(p, &p);
 254 +       vc_cma_initial = vc_cma_size;
 255 +       if (*p == '/')
 256 +               vc_cma_size = memparse(p + 1, &p);
 257 +       if (*p == '@')
 258 +               vc_cma_base = memparse(p + 1, &p);
 259 +
 260 +       new_size = (vc_cma_size - ((-vc_cma_base) & (VC_CMA_CHUNK_SIZE - 1)))
 261 +           & ~(VC_CMA_CHUNK_SIZE - 1);
 262 +       if (new_size > vc_cma_size)
 263 +               vc_cma_size = 0;
 264 +       vc_cma_initial = (vc_cma_initial + VC_CMA_CHUNK_SIZE - 1)
 265 +           & ~(VC_CMA_CHUNK_SIZE - 1);
 266 +       if (vc_cma_initial > vc_cma_size)
 267 +               vc_cma_initial = vc_cma_size;
 268 +       vc_cma_base = (vc_cma_base + VC_CMA_CHUNK_SIZE - 1)
 269 +           & ~(VC_CMA_CHUNK_SIZE - 1);
 270 +
 271 +       printk(KERN_NOTICE " -> initial %x, size %x, base %x", vc_cma_initial,
 272 +              vc_cma_size, (unsigned int)vc_cma_base);
 273 +
 274 +       return 0;
 275 +}
 276 +
 277 +early_param("vc-cma-mem", early_vc_cma_mem);
 278 +
 279 +void __init vc_cma_early_init(void)
 280 +{
 281 +       LOG_DBG("vc_cma_early_init - vc_cma_chunks = %d", vc_cma_chunks);
 282 +       if (vc_cma_size) {
 283 +               int rc = platform_device_register(&vc_cma_device);
 284 +               LOG_DBG("platform_device_register -> %d", rc);
 285 +       }
 286 +}
 287 +
 288 +void __init vc_cma_reserve(void)
 289 +{
 290 +       /* if vc_cma_size is set, then declare vc CMA area of the same
 291 +        * size from the end of memory
 292 +        */
 293 +       if (vc_cma_size) {
 294 +               if (dma_declare_contiguous(&vc_cma_device.dev, vc_cma_size,
 295 +                                          vc_cma_base, 0) == 0) {
 296 +                       if (!dev_get_cma_area(NULL)) {
 297 +                               /* There is no default CMA area - make this
 298 +                                  the default */
 299 +                               struct cma *vc_cma_area = dev_get_cma_area(
 300 +                                       &vc_cma_device.dev);
 301 +                               dma_contiguous_set_default(vc_cma_area);
 302 +                               LOG_INFO("vc_cma_reserve - using vc_cma as "
 303 +                                        "the default contiguous DMA area");
 304 +                       }
 305 +               } else {
 306 +                       LOG_ERR("vc_cma: dma_declare_contiguous(%x,%x) failed",
 307 +                               vc_cma_size, (unsigned int)vc_cma_base);
 308 +                       vc_cma_size = 0;
 309 +               }
 310 +       }
 311 +       vc_cma_chunks = vc_cma_size / VC_CMA_CHUNK_SIZE;
 312 +}
 313 +
 314 +/****************************************************************************
 315 +*
 316 +*   vc_cma_open
 317 +*
 318 +***************************************************************************/
 319 +
 320 +static int vc_cma_open(struct inode *inode, struct file *file)
 321 +{
 322 +       (void)inode;
 323 +       (void)file;
 324 +
 325 +       return 0;
 326 +}
 327 +
 328 +/****************************************************************************
 329 +*
 330 +*   vc_cma_release
 331 +*
 332 +***************************************************************************/
 333 +
 334 +static int vc_cma_release(struct inode *inode, struct file *file)
 335 +{
 336 +       (void)inode;
 337 +       (void)file;
 338 +
 339 +       vc_cma_set_reserve(0, current->tgid);
 340 +
 341 +       return 0;
 342 +}
 343 +
 344 +/****************************************************************************
 345 +*
 346 +*   vc_cma_ioctl
 347 +*
 348 +***************************************************************************/
 349 +
 350 +static long vc_cma_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 351 +{
 352 +       int rc = 0;
 353 +
 354 +       (void)cmd;
 355 +       (void)arg;
 356 +
 357 +       switch (cmd) {
 358 +       case VC_CMA_IOC_RESERVE:
 359 +               rc = vc_cma_set_reserve((unsigned int)arg, current->tgid);
 360 +               if (rc >= 0)
 361 +                       rc = 0;
 362 +               break;
 363 +       default:
 364 +               LOG_ERR("vc-cma: Unknown ioctl %x", cmd);
 365 +               return -ENOTTY;
 366 +       }
 367 +
 368 +       return rc;
 369 +}
 370 +
 371 +/****************************************************************************
 372 +*
 373 +*   File Operations for the driver.
 374 +*
 375 +***************************************************************************/
 376 +
 377 +static const struct file_operations vc_cma_fops = {
 378 +       .owner = THIS_MODULE,
 379 +       .open = vc_cma_open,
 380 +       .release = vc_cma_release,
 381 +       .unlocked_ioctl = vc_cma_ioctl,
 382 +};
 383 +
 384 +/****************************************************************************
 385 +*
 386 +*   vc_cma_proc_open
 387 +*
 388 +***************************************************************************/
 389 +
 390 +static int vc_cma_show_info(struct seq_file *m, void *v)
 391 +{
 392 +       int i;
 393 +
 394 +       seq_printf(m, "Videocore CMA:\n");
 395 +       seq_printf(m, "   Base       : %08x\n", (unsigned int)vc_cma_base);
 396 +       seq_printf(m, "   Length     : %08x\n", vc_cma_size);
 397 +       seq_printf(m, "   Initial    : %08x\n", vc_cma_initial);
 398 +       seq_printf(m, "   Chunk size : %08x\n", VC_CMA_CHUNK_SIZE);
 399 +       seq_printf(m, "   Chunks     : %4d (%d bytes)\n",
 400 +                  (int)vc_cma_chunks,
 401 +                  (int)(vc_cma_chunks * VC_CMA_CHUNK_SIZE));
 402 +       seq_printf(m, "   Used       : %4d (%d bytes)\n",
 403 +                  (int)vc_cma_chunks_used,
 404 +                  (int)(vc_cma_chunks_used * VC_CMA_CHUNK_SIZE));
 405 +       seq_printf(m, "   Reserved   : %4d (%d bytes)\n",
 406 +                  (unsigned int)vc_cma_chunks_reserved,
 407 +                  (int)(vc_cma_chunks_reserved * VC_CMA_CHUNK_SIZE));
 408 +
 409 +       for (i = 0; i < vc_cma_reserve_count; i++) {
 410 +               struct vc_cma_reserve_user *user = &vc_cma_reserve_users[i];
 411 +               seq_printf(m, "     PID %5d: %d bytes\n", user->pid,
 412 +                          user->reserve);
 413 +       }
 414 +       seq_printf(m, "   dma_alloc  : %p (%d pages)\n",
 415 +                  vc_cma_dma_alloc ? page_address(vc_cma_dma_alloc) : 0,
 416 +                  vc_cma_dma_size);
 417 +
 418 +       seq_printf(m, "\n");
 419 +
 420 +       return 0;
 421 +}
 422 +
 423 +static int vc_cma_proc_open(struct inode *inode, struct file *file)
 424 +{
 425 +       return single_open(file, vc_cma_show_info, NULL);
 426 +}
 427 +
 428 +/****************************************************************************
 429 +*
 430 +*   vc_cma_proc_write
 431 +*
 432 +***************************************************************************/
 433 +
 434 +static int vc_cma_proc_write(struct file *file,
 435 +                            const char __user *buffer,
 436 +                            size_t size, loff_t *ppos)
 437 +{
 438 +       int rc = -EFAULT;
 439 +       char input_str[20];
 440 +
 441 +       memset(input_str, 0, sizeof(input_str));
 442 +
 443 +       if (size > sizeof(input_str)) {
 444 +               LOG_ERR("%s: input string length too long", __func__);
 445 +               goto out;
 446 +       }
 447 +
 448 +       if (copy_from_user(input_str, buffer, size - 1)) {
 449 +               LOG_ERR("%s: failed to get input string", __func__);
 450 +               goto out;
 451 +       }
 452 +#define ALLOC_STR "alloc"
 453 +#define FREE_STR "free"
 454 +#define DEBUG_STR "debug"
 455 +#define RESERVE_STR "reserve"
 456 +#define DMA_ALLOC_STR "dma_alloc"
 457 +#define DMA_FREE_STR "dma_free"
 458 +       if (strncmp(input_str, ALLOC_STR, strlen(ALLOC_STR)) == 0) {
 459 +               int alloc_size;
 460 +               char *p = input_str + strlen(ALLOC_STR);
 461 +
 462 +               while (*p == ' ')
 463 +                       p++;
 464 +               alloc_size = memparse(p, NULL);
 465 +               LOG_INFO("/proc/vc-cma: alloc %d", alloc_size);
 466 +               if (alloc_size)
 467 +                       send_vc_msg(VC_CMA_MSG_REQUEST_FREE,
 468 +                                   alloc_size / VC_CMA_CHUNK_SIZE, 0);
 469 +               else
 470 +                       LOG_ERR("invalid size '%s'", p);
 471 +               rc = size;
 472 +       } else if (strncmp(input_str, FREE_STR, strlen(FREE_STR)) == 0) {
 473 +               int alloc_size;
 474 +               char *p = input_str + strlen(FREE_STR);
 475 +
 476 +               while (*p == ' ')
 477 +                       p++;
 478 +               alloc_size = memparse(p, NULL);
 479 +               LOG_INFO("/proc/vc-cma: free %d", alloc_size);
 480 +               if (alloc_size)
 481 +                       send_vc_msg(VC_CMA_MSG_REQUEST_ALLOC,
 482 +                                   alloc_size / VC_CMA_CHUNK_SIZE, 0);
 483 +               else
 484 +                       LOG_ERR("invalid size '%s'", p);
 485 +               rc = size;
 486 +       } else if (strncmp(input_str, DEBUG_STR, strlen(DEBUG_STR)) == 0) {
 487 +               char *p = input_str + strlen(DEBUG_STR);
 488 +               while (*p == ' ')
 489 +                       p++;
 490 +               if ((strcmp(p, "on") == 0) || (strcmp(p, "1") == 0))
 491 +                       vc_cma_debug = 1;
 492 +               else if ((strcmp(p, "off") == 0) || (strcmp(p, "0") == 0))
 493 +                       vc_cma_debug = 0;
 494 +               LOG_INFO("/proc/vc-cma: debug %s", vc_cma_debug ? "on" : "off");
 495 +               rc = size;
 496 +       } else if (strncmp(input_str, RESERVE_STR, strlen(RESERVE_STR)) == 0) {
 497 +               int alloc_size;
 498 +               int reserved;
 499 +               char *p = input_str + strlen(RESERVE_STR);
 500 +               while (*p == ' ')
 501 +                       p++;
 502 +               alloc_size = memparse(p, NULL);
 503 +
 504 +               reserved = vc_cma_set_reserve(alloc_size, current->tgid);
 505 +               rc = (reserved >= 0) ? size : reserved;
 506 +       } else if (strncmp(input_str, DMA_ALLOC_STR, strlen(DMA_ALLOC_STR)) == 0) {
 507 +               int alloc_size;
 508 +               char *p = input_str + strlen(DMA_ALLOC_STR);
 509 +               while (*p == ' ')
 510 +                       p++;
 511 +               alloc_size = memparse(p, NULL);
 512 +
 513 +               if (vc_cma_dma_alloc) {
 514 +                   dma_release_from_contiguous(NULL, vc_cma_dma_alloc,
 515 +                                               vc_cma_dma_size);
 516 +                   vc_cma_dma_alloc = NULL;
 517 +                   vc_cma_dma_size = 0;
 518 +               }
 519 +               vc_cma_dma_alloc = dma_alloc_from_contiguous(NULL, alloc_size, 0);
 520 +               vc_cma_dma_size = (vc_cma_dma_alloc ? alloc_size : 0);
 521 +               if (vc_cma_dma_alloc)
 522 +                       LOG_INFO("dma_alloc(%d pages) -> %p", alloc_size, page_address(vc_cma_dma_alloc));
 523 +               else
 524 +                       LOG_ERR("dma_alloc(%d pages) failed", alloc_size);
 525 +               rc = size;
 526 +       } else if (strncmp(input_str, DMA_FREE_STR, strlen(DMA_FREE_STR)) == 0) {
 527 +               if (vc_cma_dma_alloc) {
 528 +                   dma_release_from_contiguous(NULL, vc_cma_dma_alloc,
 529 +                                               vc_cma_dma_size);
 530 +                   vc_cma_dma_alloc = NULL;
 531 +                   vc_cma_dma_size = 0;
 532 +               }
 533 +               rc = size;
 534 +       }
 535 +
 536 +out:
 537 +       return rc;
 538 +}
 539 +
 540 +/****************************************************************************
 541 +*
 542 +*   File Operations for /proc interface.
 543 +*
 544 +***************************************************************************/
 545 +
 546 +static const struct file_operations vc_cma_proc_fops = {
 547 +       .open = vc_cma_proc_open,
 548 +       .read = seq_read,
 549 +       .write = vc_cma_proc_write,
 550 +       .llseek = seq_lseek,
 551 +       .release = single_release
 552 +};
 553 +
 554 +static int vc_cma_set_reserve(unsigned int reserve, unsigned int pid)
 555 +{
 556 +       struct vc_cma_reserve_user *user = NULL;
 557 +       int delta = 0;
 558 +       int i;
 559 +
 560 +       if (down_interruptible(&vc_cma_reserve_mutex))
 561 +               return -ERESTARTSYS;
 562 +
 563 +       for (i = 0; i < vc_cma_reserve_count; i++) {
 564 +               if (pid == vc_cma_reserve_users[i].pid) {
 565 +                       user = &vc_cma_reserve_users[i];
 566 +                       delta = reserve - user->reserve;
 567 +                       if (reserve)
 568 +                               user->reserve = reserve;
 569 +                       else {
 570 +                               /* Remove this entry by copying downwards */
 571 +                               while ((i + 1) < vc_cma_reserve_count) {
 572 +                                       user[0].pid = user[1].pid;
 573 +                                       user[0].reserve = user[1].reserve;
 574 +                                       user++;
 575 +                                       i++;
 576 +                               }
 577 +                               vc_cma_reserve_count--;
 578 +                               user = NULL;
 579 +                       }
 580 +                       break;
 581 +               }
 582 +       }
 583 +
 584 +       if (reserve && !user) {
 585 +               if (vc_cma_reserve_count == VC_CMA_RESERVE_COUNT_MAX) {
 586 +                       LOG_ERR("vc-cma: Too many reservations - "
 587 +                               "increase CMA_RESERVE_COUNT_MAX");
 588 +                       up(&vc_cma_reserve_mutex);
 589 +                       return -EBUSY;
 590 +               }
 591 +               user = &vc_cma_reserve_users[vc_cma_reserve_count];
 592 +               user->pid = pid;
 593 +               user->reserve = reserve;
 594 +               delta = reserve;
 595 +               vc_cma_reserve_count++;
 596 +       }
 597 +
 598 +       vc_cma_reserve_total += delta;
 599 +
 600 +       send_vc_msg(VC_CMA_MSG_RESERVE,
 601 +                   vc_cma_reserve_total & 0xffff, vc_cma_reserve_total >> 16);
 602 +
 603 +       send_worker_msg((VCHIQ_HEADER_T *) VC_CMA_MSG_UPDATE_RESERVE);
 604 +
 605 +       LOG_DBG("/proc/vc-cma: reserve %d (PID %d) - total %u",
 606 +               reserve, pid, vc_cma_reserve_total);
 607 +
 608 +       up(&vc_cma_reserve_mutex);
 609 +
 610 +       return vc_cma_reserve_total;
 611 +}
 612 +
 613 +static VCHIQ_STATUS_T cma_service_callback(VCHIQ_REASON_T reason,
 614 +                                          VCHIQ_HEADER_T * header,
 615 +                                          VCHIQ_SERVICE_HANDLE_T service,
 616 +                                          void *bulk_userdata)
 617 +{
 618 +       switch (reason) {
 619 +       case VCHIQ_MESSAGE_AVAILABLE:
 620 +               if (!send_worker_msg(header))
 621 +                       return VCHIQ_RETRY;
 622 +               break;
 623 +       case VCHIQ_SERVICE_CLOSED:
 624 +               LOG_DBG("CMA service closed");
 625 +               break;
 626 +       default:
 627 +               LOG_ERR("Unexpected CMA callback reason %d", reason);
 628 +               break;
 629 +       }
 630 +       return VCHIQ_SUCCESS;
 631 +}
 632 +
 633 +static void send_vc_msg(unsigned short type,
 634 +                       unsigned short param1, unsigned short param2)
 635 +{
 636 +       unsigned short msg[] = { type, param1, param2 };
 637 +       VCHIQ_ELEMENT_T elem = { &msg, sizeof(msg) };
 638 +       VCHIQ_STATUS_T ret;
 639 +       vchiq_use_service(cma_service);
 640 +       ret = vchiq_queue_message(cma_service, &elem, 1);
 641 +       vchiq_release_service(cma_service);
 642 +       if (ret != VCHIQ_SUCCESS)
 643 +               LOG_ERR("vchiq_queue_message returned %x", ret);
 644 +}
 645 +
 646 +static bool send_worker_msg(VCHIQ_HEADER_T * msg)
 647 +{
 648 +       if (down_interruptible(&vc_cma_worker_queue_push_mutex))
 649 +               return false;
 650 +       vchiu_queue_push(&cma_msg_queue, msg);
 651 +       up(&vc_cma_worker_queue_push_mutex);
 652 +       return true;
 653 +}
 654 +
 655 +static int vc_cma_alloc_chunks(int num_chunks, struct cma_msg *reply)
 656 +{
 657 +       int i;
 658 +       for (i = 0; i < num_chunks; i++) {
 659 +               struct page *chunk;
 660 +               unsigned int chunk_num;
 661 +               uint8_t *chunk_addr;
 662 +               size_t chunk_size = PAGES_PER_CHUNK << PAGE_SHIFT;
 663 +
 664 +               chunk = dma_alloc_from_contiguous(&vc_cma_device.dev,
 665 +                                                 PAGES_PER_CHUNK,
 666 +                                                 VC_CMA_CHUNK_ORDER);
 667 +               if (!chunk)
 668 +                       break;
 669 +
 670 +               chunk_addr = page_address(chunk);
 671 +               dmac_flush_range(chunk_addr, chunk_addr + chunk_size);
 672 +               outer_inv_range(__pa(chunk_addr), __pa(chunk_addr) +
 673 +                       chunk_size);
 674 +
 675 +               chunk_num =
 676 +                   (page_to_phys(chunk) - vc_cma_base) / VC_CMA_CHUNK_SIZE;
 677 +               BUG_ON(((page_to_phys(chunk) - vc_cma_base) %
 678 +                       VC_CMA_CHUNK_SIZE) != 0);
 679 +               if (chunk_num >= vc_cma_chunks) {
 680 +                       phys_addr_t _pa = vc_cma_base + vc_cma_size - 1;
 681 +                       LOG_ERR("%s: ===============================",
 682 +                               __func__);
 683 +                       LOG_ERR("%s: chunk phys %x, vc_cma %pa-%pa - "
 684 +                               "bad SPARSEMEM configuration?",
 685 +                               __func__, (unsigned int)page_to_phys(chunk),
 686 +                               &vc_cma_base, &_pa);
 687 +                       LOG_ERR("%s: dev->cma_area = %p", __func__,
 688 +                               (void*)0/*vc_cma_device.dev.cma_area*/);
 689 +                       LOG_ERR("%s: ===============================",
 690 +                               __func__);
 691 +                       break;
 692 +               }
 693 +               reply->params[i] = chunk_num;
 694 +               vc_cma_chunks_used++;
 695 +       }
 696 +
 697 +       if (i < num_chunks) {
 698 +               LOG_ERR("%s: dma_alloc_from_contiguous failed "
 699 +                       "for %x bytes (alloc %d of %d, %d free)",
 700 +                       __func__, VC_CMA_CHUNK_SIZE, i,
 701 +                       num_chunks, vc_cma_chunks - vc_cma_chunks_used);
 702 +               num_chunks = i;
 703 +       }
 704 +
 705 +       LOG_DBG("CMA allocated %d chunks -> %d used",
 706 +               num_chunks, vc_cma_chunks_used);
 707 +       reply->type = VC_CMA_MSG_ALLOCATED;
 708 +
 709 +       {
 710 +               VCHIQ_ELEMENT_T elem = {
 711 +                       reply,
 712 +                       offsetof(struct cma_msg, params[0]) +
 713 +                           num_chunks * sizeof(reply->params[0])
 714 +               };
 715 +               VCHIQ_STATUS_T ret;
 716 +               vchiq_use_service(cma_service);
 717 +               ret = vchiq_queue_message(cma_service, &elem, 1);
 718 +               vchiq_release_service(cma_service);
 719 +               if (ret != VCHIQ_SUCCESS)
 720 +                       LOG_ERR("vchiq_queue_message return " "%x", ret);
 721 +       }
 722 +
 723 +       return num_chunks;
 724 +}
 725 +
 726 +static int cma_worker_proc(void *param)
 727 +{
 728 +       static struct cma_msg reply;
 729 +       (void)param;
 730 +
 731 +       while (1) {
 732 +               VCHIQ_HEADER_T *msg;
 733 +               static struct cma_msg msg_copy;
 734 +               struct cma_msg *cma_msg = &msg_copy;
 735 +               int type, msg_size;
 736 +
 737 +               msg = vchiu_queue_pop(&cma_msg_queue);
 738 +               if ((unsigned int)msg >= VC_CMA_MSG_MAX) {
 739 +                       msg_size = msg->size;
 740 +                       memcpy(&msg_copy, msg->data, msg_size);
 741 +                       type = cma_msg->type;
 742 +                       vchiq_release_message(cma_service, msg);
 743 +               } else {
 744 +                       msg_size = 0;
 745 +                       type = (int)msg;
 746 +                       if (type == VC_CMA_MSG_QUIT)
 747 +                               break;
 748 +                       else if (type == VC_CMA_MSG_UPDATE_RESERVE) {
 749 +                               msg = NULL;
 750 +                               cma_msg = NULL;
 751 +                       } else {
 752 +                               BUG();
 753 +                               continue;
 754 +                       }
 755 +               }
 756 +
 757 +               switch (type) {
 758 +               case VC_CMA_MSG_ALLOC:{
 759 +                               int num_chunks, free_chunks;
 760 +                               num_chunks = cma_msg->params[0];
 761 +                               free_chunks =
 762 +                                   vc_cma_chunks - vc_cma_chunks_used;
 763 +                               LOG_DBG("CMA_MSG_ALLOC(%d chunks)", num_chunks);
 764 +                               if (num_chunks > VC_CMA_MAX_PARAMS_PER_MSG) {
 765 +                                       LOG_ERR
 766 +                                           ("CMA_MSG_ALLOC - chunk count (%d) "
 767 +                                            "exceeds VC_CMA_MAX_PARAMS_PER_MSG (%d)",
 768 +                                            num_chunks,
 769 +                                            VC_CMA_MAX_PARAMS_PER_MSG);
 770 +                                       num_chunks = VC_CMA_MAX_PARAMS_PER_MSG;
 771 +                               }
 772 +
 773 +                               if (num_chunks > free_chunks) {
 774 +                                       LOG_ERR
 775 +                                           ("CMA_MSG_ALLOC - chunk count (%d) "
 776 +                                            "exceeds free chunks (%d)",
 777 +                                            num_chunks, free_chunks);
 778 +                                       num_chunks = free_chunks;
 779 +                               }
 780 +
 781 +                               vc_cma_alloc_chunks(num_chunks, &reply);
 782 +                       }
 783 +                       break;
 784 +
 785 +               case VC_CMA_MSG_FREE:{
 786 +                               int chunk_count =
 787 +                                   (msg_size -
 788 +                                    offsetof(struct cma_msg,
 789 +                                             params)) /
 790 +                                   sizeof(cma_msg->params[0]);
 791 +                               int i;
 792 +                               BUG_ON(chunk_count <= 0);
 793 +
 794 +                               LOG_DBG("CMA_MSG_FREE(%d chunks - %x, ...)",
 795 +                                       chunk_count, cma_msg->params[0]);
 796 +                               for (i = 0; i < chunk_count; i++) {
 797 +                                       int chunk_num = cma_msg->params[i];
 798 +                                       struct page *page = vc_cma_base_page +
 799 +                                           chunk_num * PAGES_PER_CHUNK;
 800 +                                       if (chunk_num >= vc_cma_chunks) {
 801 +                                               LOG_ERR
 802 +                                                   ("CMA_MSG_FREE - chunk %d of %d"
 803 +                                                    " (value %x) exceeds maximum "
 804 +                                                    "(%x)", i, chunk_count,
 805 +                                                    chunk_num,
 806 +                                                    vc_cma_chunks - 1);
 807 +                                               break;
 808 +                                       }
 809 +
 810 +                                       if (!dma_release_from_contiguous
 811 +                                           (&vc_cma_device.dev, page,
 812 +                                            PAGES_PER_CHUNK)) {
 813 +                                               phys_addr_t _pa = page_to_phys(page);
 814 +                                               LOG_ERR
 815 +                                                   ("CMA_MSG_FREE - failed to "
 816 +                                                    "release chunk %d (phys %pa, "
 817 +                                                    "page %x)", chunk_num,
 818 +                                                    &_pa,
 819 +                                                    (unsigned int)page);
 820 +                                       }
 821 +                                       vc_cma_chunks_used--;
 822 +                               }
 823 +                               LOG_DBG("CMA released %d chunks -> %d used",
 824 +                                       i, vc_cma_chunks_used);
 825 +                       }
 826 +                       break;
 827 +
 828 +               case VC_CMA_MSG_UPDATE_RESERVE:{
 829 +                               int chunks_needed =
 830 +                                   ((vc_cma_reserve_total + VC_CMA_CHUNK_SIZE -
 831 +                                     1)
 832 +                                    / VC_CMA_CHUNK_SIZE) -
 833 +                                   vc_cma_chunks_reserved;
 834 +
 835 +                               LOG_DBG
 836 +                                   ("CMA_MSG_UPDATE_RESERVE(%d chunks needed)",
 837 +                                    chunks_needed);
 838 +
 839 +                               /* Cap the reservations to what is available */
 840 +                               if (chunks_needed > 0) {
 841 +                                       if (chunks_needed >
 842 +                                           (vc_cma_chunks -
 843 +                                            vc_cma_chunks_used))
 844 +                                               chunks_needed =
 845 +                                                   (vc_cma_chunks -
 846 +                                                    vc_cma_chunks_used);
 847 +
 848 +                                       chunks_needed =
 849 +                                           vc_cma_alloc_chunks(chunks_needed,
 850 +                                                               &reply);
 851 +                               }
 852 +
 853 +                               LOG_DBG
 854 +                                   ("CMA_MSG_UPDATE_RESERVE(%d chunks allocated)",
 855 +                                    chunks_needed);
 856 +                               vc_cma_chunks_reserved += chunks_needed;
 857 +                       }
 858 +                       break;
 859 +
 860 +               default:
 861 +                       LOG_ERR("unexpected msg type %d", type);
 862 +                       break;
 863 +               }
 864 +       }
 865 +
 866 +       LOG_DBG("quitting...");
 867 +       return 0;
 868 +}
 869 +
 870 +/****************************************************************************
 871 +*
 872 +*   vc_cma_connected_init
 873 +*
 874 +*   This function is called once the videocore has been connected.
 875 +*
 876 +***************************************************************************/
 877 +
 878 +static void vc_cma_connected_init(void)
 879 +{
 880 +       VCHIQ_SERVICE_PARAMS_T service_params;
 881 +
 882 +       LOG_DBG("vc_cma_connected_init");
 883 +
 884 +       if (!vchiu_queue_init(&cma_msg_queue, 16)) {
 885 +               LOG_ERR("could not create CMA msg queue");
 886 +               goto fail_queue;
 887 +       }
 888 +
 889 +       if (vchiq_initialise(&cma_instance) != VCHIQ_SUCCESS)
 890 +               goto fail_vchiq_init;
 891 +
 892 +       vchiq_connect(cma_instance);
 893 +
 894 +       service_params.fourcc = VC_CMA_FOURCC;
 895 +       service_params.callback = cma_service_callback;
 896 +       service_params.userdata = NULL;
 897 +       service_params.version = VC_CMA_VERSION;
 898 +       service_params.version_min = VC_CMA_VERSION;
 899 +
 900 +       if (vchiq_open_service(cma_instance, &service_params,
 901 +                              &cma_service) != VCHIQ_SUCCESS) {
 902 +               LOG_ERR("failed to open service - already in use?");
 903 +               goto fail_vchiq_open;
 904 +       }
 905 +
 906 +       vchiq_release_service(cma_service);
 907 +
 908 +       cma_worker = kthread_create(cma_worker_proc, NULL, "cma_worker");
 909 +       if (!cma_worker) {
 910 +               LOG_ERR("could not create CMA worker thread");
 911 +               goto fail_worker;
 912 +       }
 913 +       set_user_nice(cma_worker, -20);
 914 +       wake_up_process(cma_worker);
 915 +
 916 +       return;
 917 +
 918 +fail_worker:
 919 +       vchiq_close_service(cma_service);
 920 +fail_vchiq_open:
 921 +       vchiq_shutdown(cma_instance);
 922 +fail_vchiq_init:
 923 +       vchiu_queue_delete(&cma_msg_queue);
 924 +fail_queue:
 925 +       return;
 926 +}
 927 +
 928 +void
 929 +loud_error_header(void)
 930 +{
 931 +       if (in_loud_error)
 932 +               return;
 933 +
 934 +       LOG_ERR("============================================================"
 935 +               "================");
 936 +       LOG_ERR("============================================================"
 937 +               "================");
 938 +       LOG_ERR("=====");
 939 +
 940 +       in_loud_error = 1;
 941 +}
 942 +
 943 +void
 944 +loud_error_footer(void)
 945 +{
 946 +       if (!in_loud_error)
 947 +               return;
 948 +
 949 +       LOG_ERR("=====");
 950 +       LOG_ERR("============================================================"
 951 +               "================");
 952 +       LOG_ERR("============================================================"
 953 +               "================");
 954 +
 955 +       in_loud_error = 0;
 956 +}
 957 +
 958 +#if 1
 959 +static int check_cma_config(void) { return 1; }
 960 +#else
 961 +static int
 962 +read_vc_debug_var(VC_MEM_ACCESS_HANDLE_T handle,
 963 +       const char *symbol,
 964 +       void *buf, size_t bufsize)
 965 +{
 966 +       VC_MEM_ADDR_T vcMemAddr;
 967 +       size_t vcMemSize;
 968 +       uint8_t *mapAddr;
 969 +       off_t  vcMapAddr;
 970 +
 971 +       if (!LookupVideoCoreSymbol(handle, symbol,
 972 +               &vcMemAddr,
 973 +               &vcMemSize)) {
 974 +               loud_error_header();
 975 +               loud_error(
 976 +                       "failed to find VC symbol \"%s\".",
 977 +                       symbol);
 978 +               loud_error_footer();
 979 +               return 0;
 980 +       }
 981 +
 982 +       if (vcMemSize != bufsize) {
 983 +               loud_error_header();
 984 +               loud_error(
 985 +                       "VC symbol \"%s\" is the wrong size.",
 986 +                       symbol);
 987 +               loud_error_footer();
 988 +               return 0;
 989 +       }
 990 +
 991 +       vcMapAddr = (off_t)vcMemAddr & VC_MEM_TO_ARM_ADDR_MASK;
 992 +       vcMapAddr += mm_vc_mem_phys_addr;
 993 +       mapAddr = ioremap_nocache(vcMapAddr, vcMemSize);
 994 +       if (mapAddr == 0) {
 995 +               loud_error_header();
 996 +               loud_error(
 997 +                       "failed to ioremap \"%s\" @ 0x%x "
 998 +                       "(phys: 0x%x, size: %u).",
 999 +                       symbol,
1000 +                       (unsigned int)vcMapAddr,
1001 +                       (unsigned int)vcMemAddr,
1002 +                       (unsigned int)vcMemSize);
1003 +               loud_error_footer();
1004 +               return 0;
1005 +       }
1006 +
1007 +       memcpy(buf, mapAddr, bufsize);
1008 +       iounmap(mapAddr);
1009 +
1010 +       return 1;
1011 +}
1012 +
1013 +
1014 +static int
1015 +check_cma_config(void)
1016 +{
1017 +       VC_MEM_ACCESS_HANDLE_T mem_hndl;
1018 +       VC_MEM_ADDR_T mempool_start;
1019 +       VC_MEM_ADDR_T mempool_end;
1020 +       VC_MEM_ADDR_T mempool_offline_start;
1021 +       VC_MEM_ADDR_T mempool_offline_end;
1022 +       VC_MEM_ADDR_T cam_alloc_base;
1023 +       VC_MEM_ADDR_T cam_alloc_size;
1024 +       VC_MEM_ADDR_T cam_alloc_end;
1025 +       int success = 0;
1026 +
1027 +       if (OpenVideoCoreMemory(&mem_hndl) != 0)
1028 +               goto out;
1029 +
1030 +       /* Read the relevant VideoCore variables */
1031 +       if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_START",
1032 +               &mempool_start,
1033 +               sizeof(mempool_start)))
1034 +               goto close;
1035 +
1036 +       if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_END",
1037 +               &mempool_end,
1038 +               sizeof(mempool_end)))
1039 +               goto close;
1040 +
1041 +       if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_OFFLINE_START",
1042 +               &mempool_offline_start,
1043 +               sizeof(mempool_offline_start)))
1044 +               goto close;
1045 +
1046 +       if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_OFFLINE_END",
1047 +               &mempool_offline_end,
1048 +               sizeof(mempool_offline_end)))
1049 +               goto close;
1050 +
1051 +       if (!read_vc_debug_var(mem_hndl, "cam_alloc_base",
1052 +               &cam_alloc_base,
1053 +               sizeof(cam_alloc_base)))
1054 +               goto close;
1055 +
1056 +       if (!read_vc_debug_var(mem_hndl, "cam_alloc_size",
1057 +               &cam_alloc_size,
1058 +               sizeof(cam_alloc_size)))
1059 +               goto close;
1060 +
1061 +       cam_alloc_end = cam_alloc_base + cam_alloc_size;
1062 +
1063 +       success = 1;
1064 +
1065 +       /* Now the sanity checks */
1066 +       if (!mempool_offline_start)
1067 +               mempool_offline_start = mempool_start;
1068 +       if (!mempool_offline_end)
1069 +               mempool_offline_end = mempool_end;
1070 +
1071 +       if (VCADDR_TO_PHYSADDR(mempool_offline_start) != vc_cma_base) {
1072 +               loud_error_header();
1073 +               loud_error(
1074 +                       "__MEMPOOL_OFFLINE_START(%x -> %lx) doesn't match "
1075 +                       "vc_cma_base(%x)",
1076 +                       mempool_offline_start,
1077 +                       VCADDR_TO_PHYSADDR(mempool_offline_start),
1078 +                       vc_cma_base);
1079 +               success = 0;
1080 +       }
1081 +
1082 +       if (VCADDR_TO_PHYSADDR(mempool_offline_end) !=
1083 +               (vc_cma_base + vc_cma_size)) {
1084 +               loud_error_header();
1085 +               loud_error(
1086 +                       "__MEMPOOL_OFFLINE_END(%x -> %lx) doesn't match "
1087 +                       "vc_cma_base(%x) + vc_cma_size(%x) = %x",
1088 +                       mempool_offline_start,
1089 +                       VCADDR_TO_PHYSADDR(mempool_offline_end),
1090 +                       vc_cma_base, vc_cma_size, vc_cma_base + vc_cma_size);
1091 +               success = 0;
1092 +       }
1093 +
1094 +       if (mempool_end < mempool_start) {
1095 +               loud_error_header();
1096 +               loud_error(
1097 +                       "__MEMPOOL_END(%x) must not be before "
1098 +                       "__MEMPOOL_START(%x)",
1099 +                       mempool_end,
1100 +                       mempool_start);
1101 +               success = 0;
1102 +       }
1103 +
1104 +       if (mempool_offline_end < mempool_offline_start) {
1105 +               loud_error_header();
1106 +               loud_error(
1107 +                       "__MEMPOOL_OFFLINE_END(%x) must not be before "
1108 +                       "__MEMPOOL_OFFLINE_START(%x)",
1109 +                       mempool_offline_end,
1110 +                       mempool_offline_start);
1111 +               success = 0;
1112 +       }
1113 +
1114 +       if (mempool_offline_start < mempool_start) {
1115 +               loud_error_header();
1116 +               loud_error(
1117 +                       "__MEMPOOL_OFFLINE_START(%x) must not be before "
1118 +                       "__MEMPOOL_START(%x)",
1119 +                       mempool_offline_start,
1120 +                       mempool_start);
1121 +               success = 0;
1122 +       }
1123 +
1124 +       if (mempool_offline_end > mempool_end) {
1125 +               loud_error_header();
1126 +               loud_error(
1127 +                       "__MEMPOOL_OFFLINE_END(%x) must not be after "
1128 +                       "__MEMPOOL_END(%x)",
1129 +                       mempool_offline_end,
1130 +                       mempool_end);
1131 +               success = 0;
1132 +       }
1133 +
1134 +       if ((cam_alloc_base < mempool_end) &&
1135 +               (cam_alloc_end > mempool_start)) {
1136 +               loud_error_header();
1137 +               loud_error(
1138 +                       "cam_alloc pool(%x-%x) overlaps "
1139 +                       "mempool(%x-%x)",
1140 +                       cam_alloc_base, cam_alloc_end,
1141 +                       mempool_start, mempool_end);
1142 +               success = 0;
1143 +       }
1144 +
1145 +       loud_error_footer();
1146 +
1147 +close:
1148 +       CloseVideoCoreMemory(mem_hndl);
1149 +
1150 +out:
1151 +       return success;
1152 +}
1153 +#endif
1154 +
1155 +static int vc_cma_init(void)
1156 +{
1157 +       int rc = -EFAULT;
1158 +       struct device *dev;
1159 +
1160 +       if (!check_cma_config())
1161 +               goto out_release;
1162 +
1163 +       LOG_INFO("vc-cma: Videocore CMA driver");
1164 +       LOG_INFO("vc-cma: vc_cma_base      = %pa", &vc_cma_base);
1165 +       LOG_INFO("vc-cma: vc_cma_size      = 0x%08x (%u MiB)",
1166 +                vc_cma_size, vc_cma_size / (1024 * 1024));
1167 +       LOG_INFO("vc-cma: vc_cma_initial   = 0x%08x (%u MiB)",
1168 +                vc_cma_initial, vc_cma_initial / (1024 * 1024));
1169 +
1170 +       vc_cma_base_page = phys_to_page(vc_cma_base);
1171 +
1172 +       if (vc_cma_chunks) {
1173 +               int chunks_needed = vc_cma_initial / VC_CMA_CHUNK_SIZE;
1174 +
1175 +               for (vc_cma_chunks_used = 0;
1176 +                    vc_cma_chunks_used < chunks_needed; vc_cma_chunks_used++) {
1177 +                       struct page *chunk;
1178 +                       chunk = dma_alloc_from_contiguous(&vc_cma_device.dev,
1179 +                                                         PAGES_PER_CHUNK,
1180 +                                                         VC_CMA_CHUNK_ORDER);
1181 +                       if (!chunk)
1182 +                               break;
1183 +                       BUG_ON(((page_to_phys(chunk) - vc_cma_base) %
1184 +                               VC_CMA_CHUNK_SIZE) != 0);
1185 +               }
1186 +               if (vc_cma_chunks_used != chunks_needed) {
1187 +                       LOG_ERR("%s: dma_alloc_from_contiguous failed (%d "
1188 +                               "bytes, allocation %d of %d)",
1189 +                               __func__, VC_CMA_CHUNK_SIZE,
1190 +                               vc_cma_chunks_used, chunks_needed);
1191 +                       goto out_release;
1192 +               }
1193 +
1194 +               vchiq_add_connected_callback(vc_cma_connected_init);
1195 +       }
1196 +
1197 +       rc = alloc_chrdev_region(&vc_cma_devnum, 0, 1, DRIVER_NAME);
1198 +       if (rc < 0) {
1199 +               LOG_ERR("%s: alloc_chrdev_region failed (rc=%d)", __func__, rc);
1200 +               goto out_release;
1201 +       }
1202 +
1203 +       cdev_init(&vc_cma_cdev, &vc_cma_fops);
1204 +       rc = cdev_add(&vc_cma_cdev, vc_cma_devnum, 1);
1205 +       if (rc != 0) {
1206 +               LOG_ERR("%s: cdev_add failed (rc=%d)", __func__, rc);
1207 +               goto out_unregister;
1208 +       }
1209 +
1210 +       vc_cma_class = class_create(THIS_MODULE, DRIVER_NAME);
1211 +       if (IS_ERR(vc_cma_class)) {
1212 +               rc = PTR_ERR(vc_cma_class);
1213 +               LOG_ERR("%s: class_create failed (rc=%d)", __func__, rc);
1214 +               goto out_cdev_del;
1215 +       }
1216 +
1217 +       dev = device_create(vc_cma_class, NULL, vc_cma_devnum, NULL,
1218 +                           DRIVER_NAME);
1219 +       if (IS_ERR(dev)) {
1220 +               rc = PTR_ERR(dev);
1221 +               LOG_ERR("%s: device_create failed (rc=%d)", __func__, rc);
1222 +               goto out_class_destroy;
1223 +       }
1224 +
1225 +       vc_cma_proc_entry = proc_create(DRIVER_NAME, 0444, NULL, &vc_cma_proc_fops);
1226 +       if (vc_cma_proc_entry == NULL) {
1227 +               rc = -EFAULT;
1228 +               LOG_ERR("%s: proc_create failed", __func__);
1229 +               goto out_device_destroy;
1230 +       }
1231 +
1232 +       vc_cma_inited = 1;
1233 +       return 0;
1234 +
1235 +out_device_destroy:
1236 +       device_destroy(vc_cma_class, vc_cma_devnum);
1237 +
1238 +out_class_destroy:
1239 +       class_destroy(vc_cma_class);
1240 +       vc_cma_class = NULL;
1241 +
1242 +out_cdev_del:
1243 +       cdev_del(&vc_cma_cdev);
1244 +
1245 +out_unregister:
1246 +       unregister_chrdev_region(vc_cma_devnum, 1);
1247 +
1248 +out_release:
1249 +       /* It is tempting to try to clean up by calling
1250 +          dma_release_from_contiguous for all allocated chunks, but it isn't
1251 +          a very safe thing to do. If vc_cma_initial is non-zero it is because
1252 +          VideoCore is already using that memory, so giving it back to Linux
1253 +          is likely to be fatal.
1254 +        */
1255 +       return -1;
1256 +}
1257 +
1258 +/****************************************************************************
1259 +*
1260 +*   vc_cma_exit
1261 +*
1262 +***************************************************************************/
1263 +
1264 +static void __exit vc_cma_exit(void)
1265 +{
1266 +       LOG_DBG("%s: called", __func__);
1267 +
1268 +       if (vc_cma_inited) {
1269 +               remove_proc_entry(DRIVER_NAME, NULL);
1270 +               device_destroy(vc_cma_class, vc_cma_devnum);
1271 +               class_destroy(vc_cma_class);
1272 +               cdev_del(&vc_cma_cdev);
1273 +               unregister_chrdev_region(vc_cma_devnum, 1);
1274 +       }
1275 +}
1276 +
1277 +module_init(vc_cma_init);
1278 +module_exit(vc_cma_exit);
1279 +MODULE_LICENSE("GPL");
1280 +MODULE_AUTHOR("Broadcom Corporation");
1281 --- /dev/null
1282 +++ b/include/linux/broadcom/vc_cma.h
1283 @@ -0,0 +1,36 @@
1284 +/*****************************************************************************
1285 +* Copyright 2012 Broadcom Corporation.  All rights reserved.
1286 +*
1287 +* Unless you and Broadcom execute a separate written software license
1288 +* agreement governing use of this software, this software is licensed to you
1289 +* under the terms of the GNU General Public License version 2, available at
1290 +* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
1291 +*
1292 +* Notwithstanding the above, under no circumstances may you combine this
1293 +* software in any way with any other Broadcom software provided under a
1294 +* license other than the GPL, without Broadcom's express prior written
1295 +* consent.
1296 +*****************************************************************************/
1297 +
1298 +#if !defined( VC_CMA_H )
1299 +#define VC_CMA_H
1300 +
1301 +#include <linux/ioctl.h>
1302 +
1303 +#define VC_CMA_IOC_MAGIC 0xc5
1304 +
1305 +#define VC_CMA_IOC_RESERVE _IO(VC_CMA_IOC_MAGIC, 0)
1306 +
1307 +#ifdef __KERNEL__
1308 +
1309 +#ifdef CONFIG_BCM_VC_CMA
1310 +void vc_cma_early_init(void);
1311 +void vc_cma_reserve(void);
1312 +#else
1313 +static inline void vc_cma_early_init(void) { }
1314 +static inline void vc_cma_reserve(void) { }
1315 +#endif
1316 +
1317 +#endif
1318 +
1319 +#endif /* VC_CMA_H */