target/linux/brcm2708/patches-4.1/0010-cma-Add-vc_cma-driver-to-enable-use-of-CMA.patch

   1 From 2bb9c01de4c90a8b7a9b52be95f504177abeaf45 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 010/121] cma: Add vc_cma driver to enable use of CMA
   5
   6 Signed-off-by: popcornmix <popcornmix@gmail.com>
   7
   8 vc_cma: Make the vc_cma area the default contiguous DMA area
   9 ---
  10  drivers/char/Kconfig                  |    2 +
  11  drivers/char/Makefile                 |    1 +
  12  drivers/char/broadcom/Kconfig         |   15 +
  13  drivers/char/broadcom/Makefile        |    1 +
  14  drivers/char/broadcom/vc_cma/Makefile |   14 +
  15  drivers/char/broadcom/vc_cma/vc_cma.c | 1193 +++++++++++++++++++++++++++++++++
  16  include/linux/broadcom/vc_cma.h       |   29 +
  17  7 files changed, 1255 insertions(+)
  18  create mode 100644 drivers/char/broadcom/Kconfig
  19  create mode 100644 drivers/char/broadcom/Makefile
  20  create mode 100644 drivers/char/broadcom/vc_cma/Makefile
  21  create mode 100644 drivers/char/broadcom/vc_cma/vc_cma.c
  22  create mode 100644 include/linux/broadcom/vc_cma.h
  23
  24 --- a/drivers/char/Kconfig
  25 +++ b/drivers/char/Kconfig
  26 @@ -590,6 +590,8 @@ config DEVPORT
  27
  28  source "drivers/s390/char/Kconfig"
  29
  30 +source "drivers/char/broadcom/Kconfig"
  31 +
  32  config MSM_SMD_PKT
  33         bool "Enable device interface for some SMD packet ports"
  34         default n
  35 --- a/drivers/char/Makefile
  36 +++ b/drivers/char/Makefile
  37 @@ -62,3 +62,4 @@ js-rtc-y = rtc.o
  38
  39  obj-$(CONFIG_TILE_SROM)                += tile-srom.o
  40  obj-$(CONFIG_XILLYBUS)         += xillybus/
  41 +obj-$(CONFIG_BRCM_CHAR_DRIVERS) += broadcom/
  42 --- /dev/null
  43 +++ b/drivers/char/broadcom/Kconfig
  44 @@ -0,0 +1,15 @@
  45 +#
  46 +# Broadcom char driver config
  47 +#
  48 +
  49 +menuconfig BRCM_CHAR_DRIVERS
  50 +       bool "Broadcom Char Drivers"
  51 +       help
  52 +         Broadcom's char drivers
  53 +
  54 +config BCM_VC_CMA
  55 +       bool "Videocore CMA"
  56 +       depends on CMA && BRCM_CHAR_DRIVERS && BCM2708_VCHIQ
  57 +       default n
  58 +        help
  59 +          Helper for videocore CMA access.
  60 --- /dev/null
  61 +++ b/drivers/char/broadcom/Makefile
  62 @@ -0,0 +1 @@
  63 +obj-$(CONFIG_BCM_VC_CMA)       += vc_cma/
  64 --- /dev/null
  65 +++ b/drivers/char/broadcom/vc_cma/Makefile
  66 @@ -0,0 +1,14 @@
  67 +ccflags-y  += -Wall -Wstrict-prototypes -Wno-trigraphs
  68 +ccflags-y  += -Werror
  69 +ccflags-y  += -Iinclude/linux/broadcom
  70 +ccflags-y  += -Idrivers/misc/vc04_services
  71 +ccflags-y  += -Idrivers/misc/vc04_services/interface/vchi
  72 +ccflags-y  += -Idrivers/misc/vc04_services/interface/vchiq_arm
  73 +
  74 +ccflags-y  += -D__KERNEL__
  75 +ccflags-y  += -D__linux__
  76 +ccflags-y  += -Werror
  77 +
  78 +obj-$(CONFIG_BCM_VC_CMA) += vc-cma.o
  79 +
  80 +vc-cma-objs := vc_cma.o
  81 --- /dev/null
  82 +++ b/drivers/char/broadcom/vc_cma/vc_cma.c
  83 @@ -0,0 +1,1193 @@
  84 +/**
  85 + * Copyright (c) 2010-2012 Broadcom. All rights reserved.
  86 + *
  87 + * Redistribution and use in source and binary forms, with or without
  88 + * modification, are permitted provided that the following conditions
  89 + * are met:
  90 + * 1. Redistributions of source code must retain the above copyright
  91 + *    notice, this list of conditions, and the following disclaimer,
  92 + *    without modification.
  93 + * 2. Redistributions in binary form must reproduce the above copyright
  94 + *    notice, this list of conditions and the following disclaimer in the
  95 + *    documentation and/or other materials provided with the distribution.
  96 + * 3. The names of the above-listed copyright holders may not be used
  97 + *    to endorse or promote products derived from this software without
  98 + *    specific prior written permission.
  99 + *
 100 + * ALTERNATIVELY, this software may be distributed under the terms of the
 101 + * GNU General Public License ("GPL") version 2, as published by the Free
 102 + * Software Foundation.
 103 + *
 104 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 105 + * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 106 + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 107 + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 108 + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 109 + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 110 + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 111 + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 112 + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 113 + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 114 + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 115 + */
 116 +
 117 +#include <linux/kernel.h>
 118 +#include <linux/module.h>
 119 +#include <linux/kthread.h>
 120 +#include <linux/fs.h>
 121 +#include <linux/device.h>
 122 +#include <linux/cdev.h>
 123 +#include <linux/mm.h>
 124 +#include <linux/proc_fs.h>
 125 +#include <linux/seq_file.h>
 126 +#include <linux/dma-mapping.h>
 127 +#include <linux/dma-contiguous.h>
 128 +#include <linux/platform_device.h>
 129 +#include <linux/uaccess.h>
 130 +#include <asm/cacheflush.h>
 131 +
 132 +#include "vc_cma.h"
 133 +
 134 +#include "vchiq_util.h"
 135 +#include "vchiq_connected.h"
 136 +//#include "debug_sym.h"
 137 +//#include "vc_mem.h"
 138 +
 139 +#define DRIVER_NAME  "vc-cma"
 140 +
 141 +#define LOG_DBG(fmt, ...) \
 142 +       if (vc_cma_debug) \
 143 +               printk(KERN_INFO fmt "\n", ##__VA_ARGS__)
 144 +#define LOG_INFO(fmt, ...) \
 145 +       printk(KERN_INFO fmt "\n", ##__VA_ARGS__)
 146 +#define LOG_ERR(fmt, ...) \
 147 +       printk(KERN_ERR fmt "\n", ##__VA_ARGS__)
 148 +
 149 +#define VC_CMA_FOURCC VCHIQ_MAKE_FOURCC('C', 'M', 'A', ' ')
 150 +#define VC_CMA_VERSION 2
 151 +
 152 +#define VC_CMA_CHUNK_ORDER 6   /* 256K */
 153 +#define VC_CMA_CHUNK_SIZE (4096 << VC_CMA_CHUNK_ORDER)
 154 +#define VC_CMA_MAX_PARAMS_PER_MSG \
 155 +       ((VCHIQ_MAX_MSG_SIZE - sizeof(unsigned short))/sizeof(unsigned short))
 156 +#define VC_CMA_RESERVE_COUNT_MAX 16
 157 +
 158 +#define PAGES_PER_CHUNK (VC_CMA_CHUNK_SIZE / PAGE_SIZE)
 159 +
 160 +#define VCADDR_TO_PHYSADDR(vcaddr) (mm_vc_mem_phys_addr + vcaddr)
 161 +
 162 +#define loud_error(...) \
 163 +       LOG_ERR("===== " __VA_ARGS__)
 164 +
 165 +enum {
 166 +       VC_CMA_MSG_QUIT,
 167 +       VC_CMA_MSG_OPEN,
 168 +       VC_CMA_MSG_TICK,
 169 +       VC_CMA_MSG_ALLOC,       /* chunk count */
 170 +       VC_CMA_MSG_FREE,        /* chunk, chunk, ... */
 171 +       VC_CMA_MSG_ALLOCATED,   /* chunk, chunk, ... */
 172 +       VC_CMA_MSG_REQUEST_ALLOC,       /* chunk count */
 173 +       VC_CMA_MSG_REQUEST_FREE,        /* chunk count */
 174 +       VC_CMA_MSG_RESERVE,     /* bytes lo, bytes hi */
 175 +       VC_CMA_MSG_UPDATE_RESERVE,
 176 +       VC_CMA_MSG_MAX
 177 +};
 178 +
 179 +struct cma_msg {
 180 +       unsigned short type;
 181 +       unsigned short params[VC_CMA_MAX_PARAMS_PER_MSG];
 182 +};
 183 +
 184 +struct vc_cma_reserve_user {
 185 +       unsigned int pid;
 186 +       unsigned int reserve;
 187 +};
 188 +
 189 +/* Device (/dev) related variables */
 190 +static dev_t vc_cma_devnum;
 191 +static struct class *vc_cma_class;
 192 +static struct cdev vc_cma_cdev;
 193 +static int vc_cma_inited;
 194 +static int vc_cma_debug;
 195 +
 196 +/* Proc entry */
 197 +static struct proc_dir_entry *vc_cma_proc_entry;
 198 +
 199 +phys_addr_t vc_cma_base;
 200 +struct page *vc_cma_base_page;
 201 +unsigned int vc_cma_size;
 202 +EXPORT_SYMBOL(vc_cma_size);
 203 +unsigned int vc_cma_initial;
 204 +unsigned int vc_cma_chunks;
 205 +unsigned int vc_cma_chunks_used;
 206 +unsigned int vc_cma_chunks_reserved;
 207 +
 208 +
 209 +void *vc_cma_dma_alloc;
 210 +unsigned int vc_cma_dma_size;
 211 +
 212 +static int in_loud_error;
 213 +
 214 +unsigned int vc_cma_reserve_total;
 215 +unsigned int vc_cma_reserve_count;
 216 +struct vc_cma_reserve_user vc_cma_reserve_users[VC_CMA_RESERVE_COUNT_MAX];
 217 +static DEFINE_SEMAPHORE(vc_cma_reserve_mutex);
 218 +static DEFINE_SEMAPHORE(vc_cma_worker_queue_push_mutex);
 219 +
 220 +static u64 vc_cma_dma_mask = DMA_BIT_MASK(32);
 221 +static struct platform_device vc_cma_device = {
 222 +       .name = "vc-cma",
 223 +       .id = 0,
 224 +       .dev = {
 225 +               .dma_mask = &vc_cma_dma_mask,
 226 +               .coherent_dma_mask = DMA_BIT_MASK(32),
 227 +               },
 228 +};
 229 +
 230 +static VCHIQ_INSTANCE_T cma_instance;
 231 +static VCHIQ_SERVICE_HANDLE_T cma_service;
 232 +static VCHIU_QUEUE_T cma_msg_queue;
 233 +static struct task_struct *cma_worker;
 234 +
 235 +static int vc_cma_set_reserve(unsigned int reserve, unsigned int pid);
 236 +static int vc_cma_alloc_chunks(int num_chunks, struct cma_msg *reply);
 237 +static VCHIQ_STATUS_T cma_service_callback(VCHIQ_REASON_T reason,
 238 +                                          VCHIQ_HEADER_T * header,
 239 +                                          VCHIQ_SERVICE_HANDLE_T service,
 240 +                                          void *bulk_userdata);
 241 +static void send_vc_msg(unsigned short type,
 242 +                       unsigned short param1, unsigned short param2);
 243 +static bool send_worker_msg(VCHIQ_HEADER_T * msg);
 244 +
 245 +static int early_vc_cma_mem(char *p)
 246 +{
 247 +       unsigned int new_size;
 248 +       printk(KERN_NOTICE "early_vc_cma_mem(%s)", p);
 249 +       vc_cma_size = memparse(p, &p);
 250 +       vc_cma_initial = vc_cma_size;
 251 +       if (*p == '/')
 252 +               vc_cma_size = memparse(p + 1, &p);
 253 +       if (*p == '@')
 254 +               vc_cma_base = memparse(p + 1, &p);
 255 +
 256 +       new_size = (vc_cma_size - ((-vc_cma_base) & (VC_CMA_CHUNK_SIZE - 1)))
 257 +           & ~(VC_CMA_CHUNK_SIZE - 1);
 258 +       if (new_size > vc_cma_size)
 259 +               vc_cma_size = 0;
 260 +       vc_cma_initial = (vc_cma_initial + VC_CMA_CHUNK_SIZE - 1)
 261 +           & ~(VC_CMA_CHUNK_SIZE - 1);
 262 +       if (vc_cma_initial > vc_cma_size)
 263 +               vc_cma_initial = vc_cma_size;
 264 +       vc_cma_base = (vc_cma_base + VC_CMA_CHUNK_SIZE - 1)
 265 +           & ~(VC_CMA_CHUNK_SIZE - 1);
 266 +
 267 +       printk(KERN_NOTICE " -> initial %x, size %x, base %x", vc_cma_initial,
 268 +              vc_cma_size, (unsigned int)vc_cma_base);
 269 +
 270 +       return 0;
 271 +}
 272 +
 273 +early_param("vc-cma-mem", early_vc_cma_mem);
 274 +
 275 +void vc_cma_early_init(void)
 276 +{
 277 +       LOG_DBG("vc_cma_early_init - vc_cma_chunks = %d", vc_cma_chunks);
 278 +       if (vc_cma_size) {
 279 +               int rc = platform_device_register(&vc_cma_device);
 280 +               LOG_DBG("platform_device_register -> %d", rc);
 281 +       }
 282 +}
 283 +
 284 +void vc_cma_reserve(void)
 285 +{
 286 +       /* if vc_cma_size is set, then declare vc CMA area of the same
 287 +        * size from the end of memory
 288 +        */
 289 +       if (vc_cma_size) {
 290 +               if (dma_declare_contiguous(&vc_cma_device.dev, vc_cma_size,
 291 +                                          vc_cma_base, 0) == 0) {
 292 +                       if (!dev_get_cma_area(NULL)) {
 293 +                               /* There is no default CMA area - make this
 294 +                                  the default */
 295 +                               struct cma *vc_cma_area = dev_get_cma_area(
 296 +                                       &vc_cma_device.dev);
 297 +                               dma_contiguous_set_default(vc_cma_area);
 298 +                               LOG_INFO("vc_cma_reserve - using vc_cma as "
 299 +                                        "the default contiguous DMA area");
 300 +                       }
 301 +               } else {
 302 +                       LOG_ERR("vc_cma: dma_declare_contiguous(%x,%x) failed",
 303 +                               vc_cma_size, (unsigned int)vc_cma_base);
 304 +                       vc_cma_size = 0;
 305 +               }
 306 +       }
 307 +       vc_cma_chunks = vc_cma_size / VC_CMA_CHUNK_SIZE;
 308 +}
 309 +
 310 +/****************************************************************************
 311 +*
 312 +*   vc_cma_open
 313 +*
 314 +***************************************************************************/
 315 +
 316 +static int vc_cma_open(struct inode *inode, struct file *file)
 317 +{
 318 +       (void)inode;
 319 +       (void)file;
 320 +
 321 +       return 0;
 322 +}
 323 +
 324 +/****************************************************************************
 325 +*
 326 +*   vc_cma_release
 327 +*
 328 +***************************************************************************/
 329 +
 330 +static int vc_cma_release(struct inode *inode, struct file *file)
 331 +{
 332 +       (void)inode;
 333 +       (void)file;
 334 +
 335 +       vc_cma_set_reserve(0, current->tgid);
 336 +
 337 +       return 0;
 338 +}
 339 +
 340 +/****************************************************************************
 341 +*
 342 +*   vc_cma_ioctl
 343 +*
 344 +***************************************************************************/
 345 +
 346 +static long vc_cma_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 347 +{
 348 +       int rc = 0;
 349 +
 350 +       (void)cmd;
 351 +       (void)arg;
 352 +
 353 +       switch (cmd) {
 354 +       case VC_CMA_IOC_RESERVE:
 355 +               rc = vc_cma_set_reserve((unsigned int)arg, current->tgid);
 356 +               if (rc >= 0)
 357 +                       rc = 0;
 358 +               break;
 359 +       default:
 360 +               LOG_ERR("vc-cma: Unknown ioctl %x", cmd);
 361 +               return -ENOTTY;
 362 +       }
 363 +
 364 +       return rc;
 365 +}
 366 +
 367 +/****************************************************************************
 368 +*
 369 +*   File Operations for the driver.
 370 +*
 371 +***************************************************************************/
 372 +
 373 +static const struct file_operations vc_cma_fops = {
 374 +       .owner = THIS_MODULE,
 375 +       .open = vc_cma_open,
 376 +       .release = vc_cma_release,
 377 +       .unlocked_ioctl = vc_cma_ioctl,
 378 +};
 379 +
 380 +/****************************************************************************
 381 +*
 382 +*   vc_cma_proc_open
 383 +*
 384 +***************************************************************************/
 385 +
 386 +static int vc_cma_show_info(struct seq_file *m, void *v)
 387 +{
 388 +       int i;
 389 +
 390 +       seq_printf(m, "Videocore CMA:\n");
 391 +       seq_printf(m, "   Base       : %08x\n", (unsigned int)vc_cma_base);
 392 +       seq_printf(m, "   Length     : %08x\n", vc_cma_size);
 393 +       seq_printf(m, "   Initial    : %08x\n", vc_cma_initial);
 394 +       seq_printf(m, "   Chunk size : %08x\n", VC_CMA_CHUNK_SIZE);
 395 +       seq_printf(m, "   Chunks     : %4d (%d bytes)\n",
 396 +                  (int)vc_cma_chunks,
 397 +                  (int)(vc_cma_chunks * VC_CMA_CHUNK_SIZE));
 398 +       seq_printf(m, "   Used       : %4d (%d bytes)\n",
 399 +                  (int)vc_cma_chunks_used,
 400 +                  (int)(vc_cma_chunks_used * VC_CMA_CHUNK_SIZE));
 401 +       seq_printf(m, "   Reserved   : %4d (%d bytes)\n",
 402 +                  (unsigned int)vc_cma_chunks_reserved,
 403 +                  (int)(vc_cma_chunks_reserved * VC_CMA_CHUNK_SIZE));
 404 +
 405 +       for (i = 0; i < vc_cma_reserve_count; i++) {
 406 +               struct vc_cma_reserve_user *user = &vc_cma_reserve_users[i];
 407 +               seq_printf(m, "     PID %5d: %d bytes\n", user->pid,
 408 +                          user->reserve);
 409 +       }
 410 +       seq_printf(m, "   dma_alloc  : %p (%d pages)\n",
 411 +                  vc_cma_dma_alloc ? page_address(vc_cma_dma_alloc) : 0,
 412 +                  vc_cma_dma_size);
 413 +
 414 +       seq_printf(m, "\n");
 415 +
 416 +       return 0;
 417 +}
 418 +
 419 +static int vc_cma_proc_open(struct inode *inode, struct file *file)
 420 +{
 421 +       return single_open(file, vc_cma_show_info, NULL);
 422 +}
 423 +
 424 +/****************************************************************************
 425 +*
 426 +*   vc_cma_proc_write
 427 +*
 428 +***************************************************************************/
 429 +
 430 +static int vc_cma_proc_write(struct file *file,
 431 +                            const char __user *buffer,
 432 +                            size_t size, loff_t *ppos)
 433 +{
 434 +       int rc = -EFAULT;
 435 +       char input_str[20];
 436 +
 437 +       memset(input_str, 0, sizeof(input_str));
 438 +
 439 +       if (size > sizeof(input_str)) {
 440 +               LOG_ERR("%s: input string length too long", __func__);
 441 +               goto out;
 442 +       }
 443 +
 444 +       if (copy_from_user(input_str, buffer, size - 1)) {
 445 +               LOG_ERR("%s: failed to get input string", __func__);
 446 +               goto out;
 447 +       }
 448 +#define ALLOC_STR "alloc"
 449 +#define FREE_STR "free"
 450 +#define DEBUG_STR "debug"
 451 +#define RESERVE_STR "reserve"
 452 +#define DMA_ALLOC_STR "dma_alloc"
 453 +#define DMA_FREE_STR "dma_free"
 454 +       if (strncmp(input_str, ALLOC_STR, strlen(ALLOC_STR)) == 0) {
 455 +               int alloc_size;
 456 +               char *p = input_str + strlen(ALLOC_STR);
 457 +
 458 +               while (*p == ' ')
 459 +                       p++;
 460 +               alloc_size = memparse(p, NULL);
 461 +               LOG_INFO("/proc/vc-cma: alloc %d", alloc_size);
 462 +               if (alloc_size)
 463 +                       send_vc_msg(VC_CMA_MSG_REQUEST_FREE,
 464 +                                   alloc_size / VC_CMA_CHUNK_SIZE, 0);
 465 +               else
 466 +                       LOG_ERR("invalid size '%s'", p);
 467 +               rc = size;
 468 +       } else if (strncmp(input_str, FREE_STR, strlen(FREE_STR)) == 0) {
 469 +               int alloc_size;
 470 +               char *p = input_str + strlen(FREE_STR);
 471 +
 472 +               while (*p == ' ')
 473 +                       p++;
 474 +               alloc_size = memparse(p, NULL);
 475 +               LOG_INFO("/proc/vc-cma: free %d", alloc_size);
 476 +               if (alloc_size)
 477 +                       send_vc_msg(VC_CMA_MSG_REQUEST_ALLOC,
 478 +                                   alloc_size / VC_CMA_CHUNK_SIZE, 0);
 479 +               else
 480 +                       LOG_ERR("invalid size '%s'", p);
 481 +               rc = size;
 482 +       } else if (strncmp(input_str, DEBUG_STR, strlen(DEBUG_STR)) == 0) {
 483 +               char *p = input_str + strlen(DEBUG_STR);
 484 +               while (*p == ' ')
 485 +                       p++;
 486 +               if ((strcmp(p, "on") == 0) || (strcmp(p, "1") == 0))
 487 +                       vc_cma_debug = 1;
 488 +               else if ((strcmp(p, "off") == 0) || (strcmp(p, "0") == 0))
 489 +                       vc_cma_debug = 0;
 490 +               LOG_INFO("/proc/vc-cma: debug %s", vc_cma_debug ? "on" : "off");
 491 +               rc = size;
 492 +       } else if (strncmp(input_str, RESERVE_STR, strlen(RESERVE_STR)) == 0) {
 493 +               int alloc_size;
 494 +               int reserved;
 495 +               char *p = input_str + strlen(RESERVE_STR);
 496 +               while (*p == ' ')
 497 +                       p++;
 498 +               alloc_size = memparse(p, NULL);
 499 +
 500 +               reserved = vc_cma_set_reserve(alloc_size, current->tgid);
 501 +               rc = (reserved >= 0) ? size : reserved;
 502 +       } else if (strncmp(input_str, DMA_ALLOC_STR, strlen(DMA_ALLOC_STR)) == 0) {
 503 +               int alloc_size;
 504 +               char *p = input_str + strlen(DMA_ALLOC_STR);
 505 +               while (*p == ' ')
 506 +                       p++;
 507 +               alloc_size = memparse(p, NULL);
 508 +
 509 +               if (vc_cma_dma_alloc) {
 510 +                   dma_release_from_contiguous(NULL, vc_cma_dma_alloc,
 511 +                                               vc_cma_dma_size);
 512 +                   vc_cma_dma_alloc = NULL;
 513 +                   vc_cma_dma_size = 0;
 514 +               }
 515 +               vc_cma_dma_alloc = dma_alloc_from_contiguous(NULL, alloc_size, 0);
 516 +               vc_cma_dma_size = (vc_cma_dma_alloc ? alloc_size : 0);
 517 +               if (vc_cma_dma_alloc)
 518 +                       LOG_INFO("dma_alloc(%d pages) -> %p", alloc_size, page_address(vc_cma_dma_alloc));
 519 +               else
 520 +                       LOG_ERR("dma_alloc(%d pages) failed", alloc_size);
 521 +               rc = size;
 522 +       } else if (strncmp(input_str, DMA_FREE_STR, strlen(DMA_FREE_STR)) == 0) {
 523 +               if (vc_cma_dma_alloc) {
 524 +                   dma_release_from_contiguous(NULL, vc_cma_dma_alloc,
 525 +                                               vc_cma_dma_size);
 526 +                   vc_cma_dma_alloc = NULL;
 527 +                   vc_cma_dma_size = 0;
 528 +               }
 529 +               rc = size;
 530 +       }
 531 +
 532 +out:
 533 +       return rc;
 534 +}
 535 +
 536 +/****************************************************************************
 537 +*
 538 +*   File Operations for /proc interface.
 539 +*
 540 +***************************************************************************/
 541 +
 542 +static const struct file_operations vc_cma_proc_fops = {
 543 +       .open = vc_cma_proc_open,
 544 +       .read = seq_read,
 545 +       .write = vc_cma_proc_write,
 546 +       .llseek = seq_lseek,
 547 +       .release = single_release
 548 +};
 549 +
 550 +static int vc_cma_set_reserve(unsigned int reserve, unsigned int pid)
 551 +{
 552 +       struct vc_cma_reserve_user *user = NULL;
 553 +       int delta = 0;
 554 +       int i;
 555 +
 556 +       if (down_interruptible(&vc_cma_reserve_mutex))
 557 +               return -ERESTARTSYS;
 558 +
 559 +       for (i = 0; i < vc_cma_reserve_count; i++) {
 560 +               if (pid == vc_cma_reserve_users[i].pid) {
 561 +                       user = &vc_cma_reserve_users[i];
 562 +                       delta = reserve - user->reserve;
 563 +                       if (reserve)
 564 +                               user->reserve = reserve;
 565 +                       else {
 566 +                               /* Remove this entry by copying downwards */
 567 +                               while ((i + 1) < vc_cma_reserve_count) {
 568 +                                       user[0].pid = user[1].pid;
 569 +                                       user[0].reserve = user[1].reserve;
 570 +                                       user++;
 571 +                                       i++;
 572 +                               }
 573 +                               vc_cma_reserve_count--;
 574 +                               user = NULL;
 575 +                       }
 576 +                       break;
 577 +               }
 578 +       }
 579 +
 580 +       if (reserve && !user) {
 581 +               if (vc_cma_reserve_count == VC_CMA_RESERVE_COUNT_MAX) {
 582 +                       LOG_ERR("vc-cma: Too many reservations - "
 583 +                               "increase CMA_RESERVE_COUNT_MAX");
 584 +                       up(&vc_cma_reserve_mutex);
 585 +                       return -EBUSY;
 586 +               }
 587 +               user = &vc_cma_reserve_users[vc_cma_reserve_count];
 588 +               user->pid = pid;
 589 +               user->reserve = reserve;
 590 +               delta = reserve;
 591 +               vc_cma_reserve_count++;
 592 +       }
 593 +
 594 +       vc_cma_reserve_total += delta;
 595 +
 596 +       send_vc_msg(VC_CMA_MSG_RESERVE,
 597 +                   vc_cma_reserve_total & 0xffff, vc_cma_reserve_total >> 16);
 598 +
 599 +       send_worker_msg((VCHIQ_HEADER_T *) VC_CMA_MSG_UPDATE_RESERVE);
 600 +
 601 +       LOG_DBG("/proc/vc-cma: reserve %d (PID %d) - total %u",
 602 +               reserve, pid, vc_cma_reserve_total);
 603 +
 604 +       up(&vc_cma_reserve_mutex);
 605 +
 606 +       return vc_cma_reserve_total;
 607 +}
 608 +
 609 +static VCHIQ_STATUS_T cma_service_callback(VCHIQ_REASON_T reason,
 610 +                                          VCHIQ_HEADER_T * header,
 611 +                                          VCHIQ_SERVICE_HANDLE_T service,
 612 +                                          void *bulk_userdata)
 613 +{
 614 +       switch (reason) {
 615 +       case VCHIQ_MESSAGE_AVAILABLE:
 616 +               if (!send_worker_msg(header))
 617 +                       return VCHIQ_RETRY;
 618 +               break;
 619 +       case VCHIQ_SERVICE_CLOSED:
 620 +               LOG_DBG("CMA service closed");
 621 +               break;
 622 +       default:
 623 +               LOG_ERR("Unexpected CMA callback reason %d", reason);
 624 +               break;
 625 +       }
 626 +       return VCHIQ_SUCCESS;
 627 +}
 628 +
 629 +static void send_vc_msg(unsigned short type,
 630 +                       unsigned short param1, unsigned short param2)
 631 +{
 632 +       unsigned short msg[] = { type, param1, param2 };
 633 +       VCHIQ_ELEMENT_T elem = { &msg, sizeof(msg) };
 634 +       VCHIQ_STATUS_T ret;
 635 +       vchiq_use_service(cma_service);
 636 +       ret = vchiq_queue_message(cma_service, &elem, 1);
 637 +       vchiq_release_service(cma_service);
 638 +       if (ret != VCHIQ_SUCCESS)
 639 +               LOG_ERR("vchiq_queue_message returned %x", ret);
 640 +}
 641 +
 642 +static bool send_worker_msg(VCHIQ_HEADER_T * msg)
 643 +{
 644 +       if (down_interruptible(&vc_cma_worker_queue_push_mutex))
 645 +               return false;
 646 +       vchiu_queue_push(&cma_msg_queue, msg);
 647 +       up(&vc_cma_worker_queue_push_mutex);
 648 +       return true;
 649 +}
 650 +
 651 +static int vc_cma_alloc_chunks(int num_chunks, struct cma_msg *reply)
 652 +{
 653 +       int i;
 654 +       for (i = 0; i < num_chunks; i++) {
 655 +               struct page *chunk;
 656 +               unsigned int chunk_num;
 657 +               uint8_t *chunk_addr;
 658 +               size_t chunk_size = PAGES_PER_CHUNK << PAGE_SHIFT;
 659 +
 660 +               chunk = dma_alloc_from_contiguous(&vc_cma_device.dev,
 661 +                                                 PAGES_PER_CHUNK,
 662 +                                                 VC_CMA_CHUNK_ORDER);
 663 +               if (!chunk)
 664 +                       break;
 665 +
 666 +               chunk_addr = page_address(chunk);
 667 +               dmac_flush_range(chunk_addr, chunk_addr + chunk_size);
 668 +               outer_inv_range(__pa(chunk_addr), __pa(chunk_addr) +
 669 +                       chunk_size);
 670 +
 671 +               chunk_num =
 672 +                   (page_to_phys(chunk) - vc_cma_base) / VC_CMA_CHUNK_SIZE;
 673 +               BUG_ON(((page_to_phys(chunk) - vc_cma_base) %
 674 +                       VC_CMA_CHUNK_SIZE) != 0);
 675 +               if (chunk_num >= vc_cma_chunks) {
 676 +                       phys_addr_t _pa = vc_cma_base + vc_cma_size - 1;
 677 +                       LOG_ERR("%s: ===============================",
 678 +                               __func__);
 679 +                       LOG_ERR("%s: chunk phys %x, vc_cma %pa-%pa - "
 680 +                               "bad SPARSEMEM configuration?",
 681 +                               __func__, (unsigned int)page_to_phys(chunk),
 682 +                               &vc_cma_base, &_pa);
 683 +                       LOG_ERR("%s: dev->cma_area = %p", __func__,
 684 +                               (void*)0/*vc_cma_device.dev.cma_area*/);
 685 +                       LOG_ERR("%s: ===============================",
 686 +                               __func__);
 687 +                       break;
 688 +               }
 689 +               reply->params[i] = chunk_num;
 690 +               vc_cma_chunks_used++;
 691 +       }
 692 +
 693 +       if (i < num_chunks) {
 694 +               LOG_ERR("%s: dma_alloc_from_contiguous failed "
 695 +                       "for %x bytes (alloc %d of %d, %d free)",
 696 +                       __func__, VC_CMA_CHUNK_SIZE, i,
 697 +                       num_chunks, vc_cma_chunks - vc_cma_chunks_used);
 698 +               num_chunks = i;
 699 +       }
 700 +
 701 +       LOG_DBG("CMA allocated %d chunks -> %d used",
 702 +               num_chunks, vc_cma_chunks_used);
 703 +       reply->type = VC_CMA_MSG_ALLOCATED;
 704 +
 705 +       {
 706 +               VCHIQ_ELEMENT_T elem = {
 707 +                       reply,
 708 +                       offsetof(struct cma_msg, params[0]) +
 709 +                           num_chunks * sizeof(reply->params[0])
 710 +               };
 711 +               VCHIQ_STATUS_T ret;
 712 +               vchiq_use_service(cma_service);
 713 +               ret = vchiq_queue_message(cma_service, &elem, 1);
 714 +               vchiq_release_service(cma_service);
 715 +               if (ret != VCHIQ_SUCCESS)
 716 +                       LOG_ERR("vchiq_queue_message return " "%x", ret);
 717 +       }
 718 +
 719 +       return num_chunks;
 720 +}
 721 +
 722 +static int cma_worker_proc(void *param)
 723 +{
 724 +       static struct cma_msg reply;
 725 +       (void)param;
 726 +
 727 +       while (1) {
 728 +               VCHIQ_HEADER_T *msg;
 729 +               static struct cma_msg msg_copy;
 730 +               struct cma_msg *cma_msg = &msg_copy;
 731 +               int type, msg_size;
 732 +
 733 +               msg = vchiu_queue_pop(&cma_msg_queue);
 734 +               if ((unsigned int)msg >= VC_CMA_MSG_MAX) {
 735 +                       msg_size = msg->size;
 736 +                       memcpy(&msg_copy, msg->data, msg_size);
 737 +                       type = cma_msg->type;
 738 +                       vchiq_release_message(cma_service, msg);
 739 +               } else {
 740 +                       msg_size = 0;
 741 +                       type = (int)msg;
 742 +                       if (type == VC_CMA_MSG_QUIT)
 743 +                               break;
 744 +                       else if (type == VC_CMA_MSG_UPDATE_RESERVE) {
 745 +                               msg = NULL;
 746 +                               cma_msg = NULL;
 747 +                       } else {
 748 +                               BUG();
 749 +                               continue;
 750 +                       }
 751 +               }
 752 +
 753 +               switch (type) {
 754 +               case VC_CMA_MSG_ALLOC:{
 755 +                               int num_chunks, free_chunks;
 756 +                               num_chunks = cma_msg->params[0];
 757 +                               free_chunks =
 758 +                                   vc_cma_chunks - vc_cma_chunks_used;
 759 +                               LOG_DBG("CMA_MSG_ALLOC(%d chunks)", num_chunks);
 760 +                               if (num_chunks > VC_CMA_MAX_PARAMS_PER_MSG) {
 761 +                                       LOG_ERR
 762 +                                           ("CMA_MSG_ALLOC - chunk count (%d) "
 763 +                                            "exceeds VC_CMA_MAX_PARAMS_PER_MSG (%d)",
 764 +                                            num_chunks,
 765 +                                            VC_CMA_MAX_PARAMS_PER_MSG);
 766 +                                       num_chunks = VC_CMA_MAX_PARAMS_PER_MSG;
 767 +                               }
 768 +
 769 +                               if (num_chunks > free_chunks) {
 770 +                                       LOG_ERR
 771 +                                           ("CMA_MSG_ALLOC - chunk count (%d) "
 772 +                                            "exceeds free chunks (%d)",
 773 +                                            num_chunks, free_chunks);
 774 +                                       num_chunks = free_chunks;
 775 +                               }
 776 +
 777 +                               vc_cma_alloc_chunks(num_chunks, &reply);
 778 +                       }
 779 +                       break;
 780 +
 781 +               case VC_CMA_MSG_FREE:{
 782 +                               int chunk_count =
 783 +                                   (msg_size -
 784 +                                    offsetof(struct cma_msg,
 785 +                                             params)) /
 786 +                                   sizeof(cma_msg->params[0]);
 787 +                               int i;
 788 +                               BUG_ON(chunk_count <= 0);
 789 +
 790 +                               LOG_DBG("CMA_MSG_FREE(%d chunks - %x, ...)",
 791 +                                       chunk_count, cma_msg->params[0]);
 792 +                               for (i = 0; i < chunk_count; i++) {
 793 +                                       int chunk_num = cma_msg->params[i];
 794 +                                       struct page *page = vc_cma_base_page +
 795 +                                           chunk_num * PAGES_PER_CHUNK;
 796 +                                       if (chunk_num >= vc_cma_chunks) {
 797 +                                               LOG_ERR
 798 +                                                   ("CMA_MSG_FREE - chunk %d of %d"
 799 +                                                    " (value %x) exceeds maximum "
 800 +                                                    "(%x)", i, chunk_count,
 801 +                                                    chunk_num,
 802 +                                                    vc_cma_chunks - 1);
 803 +                                               break;
 804 +                                       }
 805 +
 806 +                                       if (!dma_release_from_contiguous
 807 +                                           (&vc_cma_device.dev, page,
 808 +                                            PAGES_PER_CHUNK)) {
 809 +                                               phys_addr_t _pa = page_to_phys(page);
 810 +                                               LOG_ERR
 811 +                                                   ("CMA_MSG_FREE - failed to "
 812 +                                                    "release chunk %d (phys %pa, "
 813 +                                                    "page %x)", chunk_num,
 814 +                                                    &_pa,
 815 +                                                    (unsigned int)page);
 816 +                                       }
 817 +                                       vc_cma_chunks_used--;
 818 +                               }
 819 +                               LOG_DBG("CMA released %d chunks -> %d used",
 820 +                                       i, vc_cma_chunks_used);
 821 +                       }
 822 +                       break;
 823 +
 824 +               case VC_CMA_MSG_UPDATE_RESERVE:{
 825 +                               int chunks_needed =
 826 +                                   ((vc_cma_reserve_total + VC_CMA_CHUNK_SIZE -
 827 +                                     1)
 828 +                                    / VC_CMA_CHUNK_SIZE) -
 829 +                                   vc_cma_chunks_reserved;
 830 +
 831 +                               LOG_DBG
 832 +                                   ("CMA_MSG_UPDATE_RESERVE(%d chunks needed)",
 833 +                                    chunks_needed);
 834 +
 835 +                               /* Cap the reservations to what is available */
 836 +                               if (chunks_needed > 0) {
 837 +                                       if (chunks_needed >
 838 +                                           (vc_cma_chunks -
 839 +                                            vc_cma_chunks_used))
 840 +                                               chunks_needed =
 841 +                                                   (vc_cma_chunks -
 842 +                                                    vc_cma_chunks_used);
 843 +
 844 +                                       chunks_needed =
 845 +                                           vc_cma_alloc_chunks(chunks_needed,
 846 +                                                               &reply);
 847 +                               }
 848 +
 849 +                               LOG_DBG
 850 +                                   ("CMA_MSG_UPDATE_RESERVE(%d chunks allocated)",
 851 +                                    chunks_needed);
 852 +                               vc_cma_chunks_reserved += chunks_needed;
 853 +                       }
 854 +                       break;
 855 +
 856 +               default:
 857 +                       LOG_ERR("unexpected msg type %d", type);
 858 +                       break;
 859 +               }
 860 +       }
 861 +
 862 +       LOG_DBG("quitting...");
 863 +       return 0;
 864 +}
 865 +
 866 +/****************************************************************************
 867 +*
 868 +*   vc_cma_connected_init
 869 +*
 870 +*   This function is called once the videocore has been connected.
 871 +*
 872 +***************************************************************************/
 873 +
 874 +static void vc_cma_connected_init(void)
 875 +{
 876 +       VCHIQ_SERVICE_PARAMS_T service_params;
 877 +
 878 +       LOG_DBG("vc_cma_connected_init");
 879 +
 880 +       if (!vchiu_queue_init(&cma_msg_queue, 16)) {
 881 +               LOG_ERR("could not create CMA msg queue");
 882 +               goto fail_queue;
 883 +       }
 884 +
 885 +       if (vchiq_initialise(&cma_instance) != VCHIQ_SUCCESS)
 886 +               goto fail_vchiq_init;
 887 +
 888 +       vchiq_connect(cma_instance);
 889 +
 890 +       service_params.fourcc = VC_CMA_FOURCC;
 891 +       service_params.callback = cma_service_callback;
 892 +       service_params.userdata = NULL;
 893 +       service_params.version = VC_CMA_VERSION;
 894 +       service_params.version_min = VC_CMA_VERSION;
 895 +
 896 +       if (vchiq_open_service(cma_instance, &service_params,
 897 +                              &cma_service) != VCHIQ_SUCCESS) {
 898 +               LOG_ERR("failed to open service - already in use?");
 899 +               goto fail_vchiq_open;
 900 +       }
 901 +
 902 +       vchiq_release_service(cma_service);
 903 +
 904 +       cma_worker = kthread_create(cma_worker_proc, NULL, "cma_worker");
 905 +       if (!cma_worker) {
 906 +               LOG_ERR("could not create CMA worker thread");
 907 +               goto fail_worker;
 908 +       }
 909 +       set_user_nice(cma_worker, -20);
 910 +       wake_up_process(cma_worker);
 911 +
 912 +       return;
 913 +
 914 +fail_worker:
 915 +       vchiq_close_service(cma_service);
 916 +fail_vchiq_open:
 917 +       vchiq_shutdown(cma_instance);
 918 +fail_vchiq_init:
 919 +       vchiu_queue_delete(&cma_msg_queue);
 920 +fail_queue:
 921 +       return;
 922 +}
 923 +
 924 +void
 925 +loud_error_header(void)
 926 +{
 927 +       if (in_loud_error)
 928 +               return;
 929 +
 930 +       LOG_ERR("============================================================"
 931 +               "================");
 932 +       LOG_ERR("============================================================"
 933 +               "================");
 934 +       LOG_ERR("=====");
 935 +
 936 +       in_loud_error = 1;
 937 +}
 938 +
 939 +void
 940 +loud_error_footer(void)
 941 +{
 942 +       if (!in_loud_error)
 943 +               return;
 944 +
 945 +       LOG_ERR("=====");
 946 +       LOG_ERR("============================================================"
 947 +               "================");
 948 +       LOG_ERR("============================================================"
 949 +               "================");
 950 +
 951 +       in_loud_error = 0;
 952 +}
 953 +
 954 +#if 1
 955 +static int check_cma_config(void) { return 1; }
 956 +#else
 957 +static int
 958 +read_vc_debug_var(VC_MEM_ACCESS_HANDLE_T handle,
 959 +       const char *symbol,
 960 +       void *buf, size_t bufsize)
 961 +{
 962 +       VC_MEM_ADDR_T vcMemAddr;
 963 +       size_t vcMemSize;
 964 +       uint8_t *mapAddr;
 965 +       off_t  vcMapAddr;
 966 +
 967 +       if (!LookupVideoCoreSymbol(handle, symbol,
 968 +               &vcMemAddr,
 969 +               &vcMemSize)) {
 970 +               loud_error_header();
 971 +               loud_error(
 972 +                       "failed to find VC symbol \"%s\".",
 973 +                       symbol);
 974 +               loud_error_footer();
 975 +               return 0;
 976 +       }
 977 +
 978 +       if (vcMemSize != bufsize) {
 979 +               loud_error_header();
 980 +               loud_error(
 981 +                       "VC symbol \"%s\" is the wrong size.",
 982 +                       symbol);
 983 +               loud_error_footer();
 984 +               return 0;
 985 +       }
 986 +
 987 +       vcMapAddr = (off_t)vcMemAddr & VC_MEM_TO_ARM_ADDR_MASK;
 988 +       vcMapAddr += mm_vc_mem_phys_addr;
 989 +       mapAddr = ioremap_nocache(vcMapAddr, vcMemSize);
 990 +       if (mapAddr == 0) {
 991 +               loud_error_header();
 992 +               loud_error(
 993 +                       "failed to ioremap \"%s\" @ 0x%x "
 994 +                       "(phys: 0x%x, size: %u).",
 995 +                       symbol,
 996 +                       (unsigned int)vcMapAddr,
 997 +                       (unsigned int)vcMemAddr,
 998 +                       (unsigned int)vcMemSize);
 999 +               loud_error_footer();
1000 +               return 0;
1001 +       }
1002 +
1003 +       memcpy(buf, mapAddr, bufsize);
1004 +       iounmap(mapAddr);
1005 +
1006 +       return 1;
1007 +}
1008 +
1009 +
1010 +static int
1011 +check_cma_config(void)
1012 +{
1013 +       VC_MEM_ACCESS_HANDLE_T mem_hndl;
1014 +       VC_MEM_ADDR_T mempool_start;
1015 +       VC_MEM_ADDR_T mempool_end;
1016 +       VC_MEM_ADDR_T mempool_offline_start;
1017 +       VC_MEM_ADDR_T mempool_offline_end;
1018 +       VC_MEM_ADDR_T cam_alloc_base;
1019 +       VC_MEM_ADDR_T cam_alloc_size;
1020 +       VC_MEM_ADDR_T cam_alloc_end;
1021 +       int success = 0;
1022 +
1023 +       if (OpenVideoCoreMemory(&mem_hndl) != 0)
1024 +               goto out;
1025 +
1026 +       /* Read the relevant VideoCore variables */
1027 +       if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_START",
1028 +               &mempool_start,
1029 +               sizeof(mempool_start)))
1030 +               goto close;
1031 +
1032 +       if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_END",
1033 +               &mempool_end,
1034 +               sizeof(mempool_end)))
1035 +               goto close;
1036 +
1037 +       if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_OFFLINE_START",
1038 +               &mempool_offline_start,
1039 +               sizeof(mempool_offline_start)))
1040 +               goto close;
1041 +
1042 +       if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_OFFLINE_END",
1043 +               &mempool_offline_end,
1044 +               sizeof(mempool_offline_end)))
1045 +               goto close;
1046 +
1047 +       if (!read_vc_debug_var(mem_hndl, "cam_alloc_base",
1048 +               &cam_alloc_base,
1049 +               sizeof(cam_alloc_base)))
1050 +               goto close;
1051 +
1052 +       if (!read_vc_debug_var(mem_hndl, "cam_alloc_size",
1053 +               &cam_alloc_size,
1054 +               sizeof(cam_alloc_size)))
1055 +               goto close;
1056 +
1057 +       cam_alloc_end = cam_alloc_base + cam_alloc_size;
1058 +
1059 +       success = 1;
1060 +
1061 +       /* Now the sanity checks */
1062 +       if (!mempool_offline_start)
1063 +               mempool_offline_start = mempool_start;
1064 +       if (!mempool_offline_end)
1065 +               mempool_offline_end = mempool_end;
1066 +
1067 +       if (VCADDR_TO_PHYSADDR(mempool_offline_start) != vc_cma_base) {
1068 +               loud_error_header();
1069 +               loud_error(
1070 +                       "__MEMPOOL_OFFLINE_START(%x -> %lx) doesn't match "
1071 +                       "vc_cma_base(%x)",
1072 +                       mempool_offline_start,
1073 +                       VCADDR_TO_PHYSADDR(mempool_offline_start),
1074 +                       vc_cma_base);
1075 +               success = 0;
1076 +       }
1077 +
1078 +       if (VCADDR_TO_PHYSADDR(mempool_offline_end) !=
1079 +               (vc_cma_base + vc_cma_size)) {
1080 +               loud_error_header();
1081 +               loud_error(
1082 +                       "__MEMPOOL_OFFLINE_END(%x -> %lx) doesn't match "
1083 +                       "vc_cma_base(%x) + vc_cma_size(%x) = %x",
1084 +                       mempool_offline_start,
1085 +                       VCADDR_TO_PHYSADDR(mempool_offline_end),
1086 +                       vc_cma_base, vc_cma_size, vc_cma_base + vc_cma_size);
1087 +               success = 0;
1088 +       }
1089 +
1090 +       if (mempool_end < mempool_start) {
1091 +               loud_error_header();
1092 +               loud_error(
1093 +                       "__MEMPOOL_END(%x) must not be before "
1094 +                       "__MEMPOOL_START(%x)",
1095 +                       mempool_end,
1096 +                       mempool_start);
1097 +               success = 0;
1098 +       }
1099 +
1100 +       if (mempool_offline_end < mempool_offline_start) {
1101 +               loud_error_header();
1102 +               loud_error(
1103 +                       "__MEMPOOL_OFFLINE_END(%x) must not be before "
1104 +                       "__MEMPOOL_OFFLINE_START(%x)",
1105 +                       mempool_offline_end,
1106 +                       mempool_offline_start);
1107 +               success = 0;
1108 +       }
1109 +
1110 +       if (mempool_offline_start < mempool_start) {
1111 +               loud_error_header();
1112 +               loud_error(
1113 +                       "__MEMPOOL_OFFLINE_START(%x) must not be before "
1114 +                       "__MEMPOOL_START(%x)",
1115 +                       mempool_offline_start,
1116 +                       mempool_start);
1117 +               success = 0;
1118 +       }
1119 +
1120 +       if (mempool_offline_end > mempool_end) {
1121 +               loud_error_header();
1122 +               loud_error(
1123 +                       "__MEMPOOL_OFFLINE_END(%x) must not be after "
1124 +                       "__MEMPOOL_END(%x)",
1125 +                       mempool_offline_end,
1126 +                       mempool_end);
1127 +               success = 0;
1128 +       }
1129 +
1130 +       if ((cam_alloc_base < mempool_end) &&
1131 +               (cam_alloc_end > mempool_start)) {
1132 +               loud_error_header();
1133 +               loud_error(
1134 +                       "cam_alloc pool(%x-%x) overlaps "
1135 +                       "mempool(%x-%x)",
1136 +                       cam_alloc_base, cam_alloc_end,
1137 +                       mempool_start, mempool_end);
1138 +               success = 0;
1139 +       }
1140 +
1141 +       loud_error_footer();
1142 +
1143 +close:
1144 +       CloseVideoCoreMemory(mem_hndl);
1145 +
1146 +out:
1147 +       return success;
1148 +}
1149 +#endif
1150 +
1151 +static int vc_cma_init(void)
1152 +{
1153 +       int rc = -EFAULT;
1154 +       struct device *dev;
1155 +
1156 +       if (!check_cma_config())
1157 +               goto out_release;
1158 +
1159 +       LOG_INFO("vc-cma: Videocore CMA driver");
1160 +       LOG_INFO("vc-cma: vc_cma_base      = %pa", &vc_cma_base);
1161 +       LOG_INFO("vc-cma: vc_cma_size      = 0x%08x (%u MiB)",
1162 +                vc_cma_size, vc_cma_size / (1024 * 1024));
1163 +       LOG_INFO("vc-cma: vc_cma_initial   = 0x%08x (%u MiB)",
1164 +                vc_cma_initial, vc_cma_initial / (1024 * 1024));
1165 +
1166 +       vc_cma_base_page = phys_to_page(vc_cma_base);
1167 +
1168 +       if (vc_cma_chunks) {
1169 +               int chunks_needed = vc_cma_initial / VC_CMA_CHUNK_SIZE;
1170 +
1171 +               for (vc_cma_chunks_used = 0;
1172 +                    vc_cma_chunks_used < chunks_needed; vc_cma_chunks_used++) {
1173 +                       struct page *chunk;
1174 +                       chunk = dma_alloc_from_contiguous(&vc_cma_device.dev,
1175 +                                                         PAGES_PER_CHUNK,
1176 +                                                         VC_CMA_CHUNK_ORDER);
1177 +                       if (!chunk)
1178 +                               break;
1179 +                       BUG_ON(((page_to_phys(chunk) - vc_cma_base) %
1180 +                               VC_CMA_CHUNK_SIZE) != 0);
1181 +               }
1182 +               if (vc_cma_chunks_used != chunks_needed) {
1183 +                       LOG_ERR("%s: dma_alloc_from_contiguous failed (%d "
1184 +                               "bytes, allocation %d of %d)",
1185 +                               __func__, VC_CMA_CHUNK_SIZE,
1186 +                               vc_cma_chunks_used, chunks_needed);
1187 +                       goto out_release;
1188 +               }
1189 +
1190 +               vchiq_add_connected_callback(vc_cma_connected_init);
1191 +       }
1192 +
1193 +       rc = alloc_chrdev_region(&vc_cma_devnum, 0, 1, DRIVER_NAME);
1194 +       if (rc < 0) {
1195 +               LOG_ERR("%s: alloc_chrdev_region failed (rc=%d)", __func__, rc);
1196 +               goto out_release;
1197 +       }
1198 +
1199 +       cdev_init(&vc_cma_cdev, &vc_cma_fops);
1200 +       rc = cdev_add(&vc_cma_cdev, vc_cma_devnum, 1);
1201 +       if (rc != 0) {
1202 +               LOG_ERR("%s: cdev_add failed (rc=%d)", __func__, rc);
1203 +               goto out_unregister;
1204 +       }
1205 +
1206 +       vc_cma_class = class_create(THIS_MODULE, DRIVER_NAME);
1207 +       if (IS_ERR(vc_cma_class)) {
1208 +               rc = PTR_ERR(vc_cma_class);
1209 +               LOG_ERR("%s: class_create failed (rc=%d)", __func__, rc);
1210 +               goto out_cdev_del;
1211 +       }
1212 +
1213 +       dev = device_create(vc_cma_class, NULL, vc_cma_devnum, NULL,
1214 +                           DRIVER_NAME);
1215 +       if (IS_ERR(dev)) {
1216 +               rc = PTR_ERR(dev);
1217 +               LOG_ERR("%s: device_create failed (rc=%d)", __func__, rc);
1218 +               goto out_class_destroy;
1219 +       }
1220 +
1221 +       vc_cma_proc_entry = proc_create(DRIVER_NAME, 0444, NULL, &vc_cma_proc_fops);
1222 +       if (vc_cma_proc_entry == NULL) {
1223 +               rc = -EFAULT;
1224 +               LOG_ERR("%s: proc_create failed", __func__);
1225 +               goto out_device_destroy;
1226 +       }
1227 +
1228 +       vc_cma_inited = 1;
1229 +       return 0;
1230 +
1231 +out_device_destroy:
1232 +       device_destroy(vc_cma_class, vc_cma_devnum);
1233 +
1234 +out_class_destroy:
1235 +       class_destroy(vc_cma_class);
1236 +       vc_cma_class = NULL;
1237 +
1238 +out_cdev_del:
1239 +       cdev_del(&vc_cma_cdev);
1240 +
1241 +out_unregister:
1242 +       unregister_chrdev_region(vc_cma_devnum, 1);
1243 +
1244 +out_release:
1245 +       /* It is tempting to try to clean up by calling
1246 +          dma_release_from_contiguous for all allocated chunks, but it isn't
1247 +          a very safe thing to do. If vc_cma_initial is non-zero it is because
1248 +          VideoCore is already using that memory, so giving it back to Linux
1249 +          is likely to be fatal.
1250 +        */
1251 +       return -1;
1252 +}
1253 +
1254 +/****************************************************************************
1255 +*
1256 +*   vc_cma_exit
1257 +*
1258 +***************************************************************************/
1259 +
1260 +static void __exit vc_cma_exit(void)
1261 +{
1262 +       LOG_DBG("%s: called", __func__);
1263 +
1264 +       if (vc_cma_inited) {
1265 +               remove_proc_entry(DRIVER_NAME, NULL);
1266 +               device_destroy(vc_cma_class, vc_cma_devnum);
1267 +               class_destroy(vc_cma_class);
1268 +               cdev_del(&vc_cma_cdev);
1269 +               unregister_chrdev_region(vc_cma_devnum, 1);
1270 +       }
1271 +}
1272 +
1273 +module_init(vc_cma_init);
1274 +module_exit(vc_cma_exit);
1275 +MODULE_LICENSE("GPL");
1276 +MODULE_AUTHOR("Broadcom Corporation");
1277 --- /dev/null
1278 +++ b/include/linux/broadcom/vc_cma.h
1279 @@ -0,0 +1,29 @@
1280 +/*****************************************************************************
1281 +* Copyright 2012 Broadcom Corporation.  All rights reserved.
1282 +*
1283 +* Unless you and Broadcom execute a separate written software license
1284 +* agreement governing use of this software, this software is licensed to you
1285 +* under the terms of the GNU General Public License version 2, available at
1286 +* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
1287 +*
1288 +* Notwithstanding the above, under no circumstances may you combine this
1289 +* software in any way with any other Broadcom software provided under a
1290 +* license other than the GPL, without Broadcom's express prior written
1291 +* consent.
1292 +*****************************************************************************/
1293 +
1294 +#if !defined( VC_CMA_H )
1295 +#define VC_CMA_H
1296 +
1297 +#include <linux/ioctl.h>
1298 +
1299 +#define VC_CMA_IOC_MAGIC 0xc5
1300 +
1301 +#define VC_CMA_IOC_RESERVE _IO(VC_CMA_IOC_MAGIC, 0)
1302 +
1303 +#ifdef __KERNEL__
1304 +extern void __init vc_cma_early_init(void);
1305 +extern void __init vc_cma_reserve(void);
1306 +#endif
1307 +
1308 +#endif /* VC_CMA_H */