target/linux/brcm2708/patches-3.10/0006-cma-Add-vc_cma-driver-to-enable-use-of-CMA.patch

   1 From 15b3faf99f1b16184620bc89be78a5f205acbe92 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 006/196] cma: Add vc_cma driver to enable use of CMA
   5
   6 Signed-off-by: popcornmix <popcornmix@gmail.com>
   7 ---
   8  drivers/char/Kconfig                  |    2 +
   9  drivers/char/Makefile                 |    3 +
  10  drivers/char/broadcom/Kconfig         |   16 +
  11  drivers/char/broadcom/Makefile        |    2 +
  12  drivers/char/broadcom/vc_cma/Makefile |   15 +
  13  drivers/char/broadcom/vc_cma/vc_cma.c | 1143 +++++++++++++++++++++++++++++++++
  14  drivers/misc/Makefile                 |    2 +-
  15  include/linux/broadcom/vc_cma.h       |   30 +
  16  8 files changed, 1212 insertions(+), 1 deletion(-)
  17  create mode 100644 drivers/char/broadcom/Kconfig
  18  create mode 100644 drivers/char/broadcom/Makefile
  19  create mode 100644 drivers/char/broadcom/vc_cma/Makefile
  20  create mode 100644 drivers/char/broadcom/vc_cma/vc_cma.c
  21  create mode 100644 include/linux/broadcom/vc_cma.h
  22
  23 diff --git a/drivers/char/Kconfig b/drivers/char/Kconfig
  24 index 3bb6fa3..022b91c 100644
  25 --- a/drivers/char/Kconfig
  26 +++ b/drivers/char/Kconfig
  27 @@ -586,6 +586,8 @@ config DEVPORT
  28
  29  source "drivers/s390/char/Kconfig"
  30
  31 +source "drivers/char/broadcom/Kconfig"
  32 +
  33  config MSM_SMD_PKT
  34         bool "Enable device interface for some SMD packet ports"
  35         default n
  36 diff --git a/drivers/char/Makefile b/drivers/char/Makefile
  37 index 7ff1d0d..c594502 100644
  38 --- a/drivers/char/Makefile
  39 +++ b/drivers/char/Makefile
  40 @@ -62,3 +62,6 @@ obj-$(CONFIG_JS_RTC)          += js-rtc.o
  41  js-rtc-y = rtc.o
  42
  43  obj-$(CONFIG_TILE_SROM)                += tile-srom.o
  44 +
  45 +obj-$(CONFIG_BRCM_CHAR_DRIVERS) += broadcom/
  46 +
  47 diff --git a/drivers/char/broadcom/Kconfig b/drivers/char/broadcom/Kconfig
  48 new file mode 100644
  49 index 0000000..e23b440
  50 --- /dev/null
  51 +++ b/drivers/char/broadcom/Kconfig
  52 @@ -0,0 +1,16 @@
  53 +#
  54 +# Broadcom char driver config
  55 +#
  56 +
  57 +menuconfig BRCM_CHAR_DRIVERS
  58 +       bool "Broadcom Char Drivers"
  59 +       help
  60 +         Broadcom's char drivers
  61 +
  62 +config BCM_VC_CMA
  63 +       bool "Videocore CMA"
  64 +       depends on CMA && BRCM_CHAR_DRIVERS
  65 +       default n
  66 +        help
  67 +          Helper for videocore CMA access.
  68 +
  69 diff --git a/drivers/char/broadcom/Makefile b/drivers/char/broadcom/Makefile
  70 new file mode 100644
  71 index 0000000..c8574c8
  72 --- /dev/null
  73 +++ b/drivers/char/broadcom/Makefile
  74 @@ -0,0 +1,2 @@
  75 +obj-$(CONFIG_BCM_VC_CMA)       += vc_cma/
  76 +
  77 diff --git a/drivers/char/broadcom/vc_cma/Makefile b/drivers/char/broadcom/vc_cma/Makefile
  78 new file mode 100644
  79 index 0000000..ae71918
  80 --- /dev/null
  81 +++ b/drivers/char/broadcom/vc_cma/Makefile
  82 @@ -0,0 +1,15 @@
  83 +EXTRA_CFLAGS  += -Wall -Wstrict-prototypes -Wno-trigraphs
  84 +EXTRA_CFLAGS  += -Werror
  85 +EXTRA_CFLAGS  += -I"include/linux/broadcom"
  86 +EXTRA_CFLAGS  += -I"drivers/misc/vc04_services"
  87 +EXTRA_CFLAGS  += -I"drivers/misc/vc04_services/interface/vchi"
  88 +EXTRA_CFLAGS  += -I"drivers/misc/vc04_services/interface/vchiq_arm"
  89 +
  90 +EXTRA_CFLAGS  += -D__KERNEL__
  91 +EXTRA_CFLAGS  += -D__linux__
  92 +EXTRA_CFLAGS  += -Werror
  93 +
  94 +obj-$(CONFIG_BCM_VC_CMA) += vc-cma.o
  95 +
  96 +vc-cma-objs := vc_cma.o
  97 +
  98 diff --git a/drivers/char/broadcom/vc_cma/vc_cma.c b/drivers/char/broadcom/vc_cma/vc_cma.c
  99 new file mode 100644
 100 index 0000000..fe80887
 101 --- /dev/null
 102 +++ b/drivers/char/broadcom/vc_cma/vc_cma.c
 103 @@ -0,0 +1,1143 @@
 104 +/**
 105 + * Copyright (c) 2010-2012 Broadcom. All rights reserved.
 106 + *
 107 + * Redistribution and use in source and binary forms, with or without
 108 + * modification, are permitted provided that the following conditions
 109 + * are met:
 110 + * 1. Redistributions of source code must retain the above copyright
 111 + *    notice, this list of conditions, and the following disclaimer,
 112 + *    without modification.
 113 + * 2. Redistributions in binary form must reproduce the above copyright
 114 + *    notice, this list of conditions and the following disclaimer in the
 115 + *    documentation and/or other materials provided with the distribution.
 116 + * 3. The names of the above-listed copyright holders may not be used
 117 + *    to endorse or promote products derived from this software without
 118 + *    specific prior written permission.
 119 + *
 120 + * ALTERNATIVELY, this software may be distributed under the terms of the
 121 + * GNU General Public License ("GPL") version 2, as published by the Free
 122 + * Software Foundation.
 123 + *
 124 + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 125 + * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 126 + * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 127 + * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 128 + * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 129 + * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 130 + * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 131 + * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 132 + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 133 + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 134 + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 135 + */
 136 +
 137 +#include <linux/kernel.h>
 138 +#include <linux/module.h>
 139 +#include <linux/kthread.h>
 140 +#include <linux/fs.h>
 141 +#include <linux/device.h>
 142 +#include <linux/cdev.h>
 143 +#include <linux/mm.h>
 144 +#include <linux/proc_fs.h>
 145 +#include <linux/seq_file.h>
 146 +#include <linux/dma-mapping.h>
 147 +#include <linux/dma-contiguous.h>
 148 +#include <linux/platform_device.h>
 149 +#include <linux/uaccess.h>
 150 +#include <asm/cacheflush.h>
 151 +
 152 +#include "vc_cma.h"
 153 +
 154 +#include "vchiq_util.h"
 155 +#include "vchiq_connected.h"
 156 +//#include "debug_sym.h"
 157 +//#include "vc_mem.h"
 158 +
 159 +#define DRIVER_NAME  "vc-cma"
 160 +
 161 +#define LOG_DBG(fmt, ...) \
 162 +       if (vc_cma_debug) \
 163 +               printk(KERN_INFO fmt "\n", ##__VA_ARGS__)
 164 +#define LOG_ERR(fmt, ...) \
 165 +       printk(KERN_ERR fmt "\n", ##__VA_ARGS__)
 166 +
 167 +#define VC_CMA_FOURCC VCHIQ_MAKE_FOURCC('C', 'M', 'A', ' ')
 168 +#define VC_CMA_VERSION 2
 169 +
 170 +#define VC_CMA_CHUNK_ORDER 6   /* 256K */
 171 +#define VC_CMA_CHUNK_SIZE (4096 << VC_CMA_CHUNK_ORDER)
 172 +#define VC_CMA_MAX_PARAMS_PER_MSG \
 173 +       ((VCHIQ_MAX_MSG_SIZE - sizeof(unsigned short))/sizeof(unsigned short))
 174 +#define VC_CMA_RESERVE_COUNT_MAX 16
 175 +
 176 +#define PAGES_PER_CHUNK (VC_CMA_CHUNK_SIZE / PAGE_SIZE)
 177 +
 178 +#define VCADDR_TO_PHYSADDR(vcaddr) (mm_vc_mem_phys_addr + vcaddr)
 179 +
 180 +#define loud_error(...) \
 181 +       LOG_ERR("===== " __VA_ARGS__)
 182 +
 183 +enum {
 184 +       VC_CMA_MSG_QUIT,
 185 +       VC_CMA_MSG_OPEN,
 186 +       VC_CMA_MSG_TICK,
 187 +       VC_CMA_MSG_ALLOC,       /* chunk count */
 188 +       VC_CMA_MSG_FREE,        /* chunk, chunk, ... */
 189 +       VC_CMA_MSG_ALLOCATED,   /* chunk, chunk, ... */
 190 +       VC_CMA_MSG_REQUEST_ALLOC,       /* chunk count */
 191 +       VC_CMA_MSG_REQUEST_FREE,        /* chunk count */
 192 +       VC_CMA_MSG_RESERVE,     /* bytes lo, bytes hi */
 193 +       VC_CMA_MSG_UPDATE_RESERVE,
 194 +       VC_CMA_MSG_MAX
 195 +};
 196 +
 197 +struct cma_msg {
 198 +       unsigned short type;
 199 +       unsigned short params[VC_CMA_MAX_PARAMS_PER_MSG];
 200 +};
 201 +
 202 +struct vc_cma_reserve_user {
 203 +       unsigned int pid;
 204 +       unsigned int reserve;
 205 +};
 206 +
 207 +/* Device (/dev) related variables */
 208 +static dev_t vc_cma_devnum;
 209 +static struct class *vc_cma_class;
 210 +static struct cdev vc_cma_cdev;
 211 +static int vc_cma_inited;
 212 +static int vc_cma_debug;
 213 +
 214 +/* Proc entry */
 215 +static struct proc_dir_entry *vc_cma_proc_entry;
 216 +
 217 +phys_addr_t vc_cma_base;
 218 +struct page *vc_cma_base_page;
 219 +unsigned int vc_cma_size;
 220 +EXPORT_SYMBOL(vc_cma_size);
 221 +unsigned int vc_cma_initial;
 222 +unsigned int vc_cma_chunks;
 223 +unsigned int vc_cma_chunks_used;
 224 +unsigned int vc_cma_chunks_reserved;
 225 +
 226 +static int in_loud_error;
 227 +
 228 +unsigned int vc_cma_reserve_total;
 229 +unsigned int vc_cma_reserve_count;
 230 +struct vc_cma_reserve_user vc_cma_reserve_users[VC_CMA_RESERVE_COUNT_MAX];
 231 +static DEFINE_SEMAPHORE(vc_cma_reserve_mutex);
 232 +static DEFINE_SEMAPHORE(vc_cma_worker_queue_push_mutex);
 233 +
 234 +static u64 vc_cma_dma_mask = DMA_BIT_MASK(32);
 235 +static struct platform_device vc_cma_device = {
 236 +       .name = "vc-cma",
 237 +       .id = 0,
 238 +       .dev = {
 239 +               .dma_mask = &vc_cma_dma_mask,
 240 +               .coherent_dma_mask = DMA_BIT_MASK(32),
 241 +               },
 242 +};
 243 +
 244 +static VCHIQ_INSTANCE_T cma_instance;
 245 +static VCHIQ_SERVICE_HANDLE_T cma_service;
 246 +static VCHIU_QUEUE_T cma_msg_queue;
 247 +static struct task_struct *cma_worker;
 248 +
 249 +static int vc_cma_set_reserve(unsigned int reserve, unsigned int pid);
 250 +static int vc_cma_alloc_chunks(int num_chunks, struct cma_msg *reply);
 251 +static VCHIQ_STATUS_T cma_service_callback(VCHIQ_REASON_T reason,
 252 +                                          VCHIQ_HEADER_T * header,
 253 +                                          VCHIQ_SERVICE_HANDLE_T service,
 254 +                                          void *bulk_userdata);
 255 +static void send_vc_msg(unsigned short type,
 256 +                       unsigned short param1, unsigned short param2);
 257 +static bool send_worker_msg(VCHIQ_HEADER_T * msg);
 258 +
 259 +static int early_vc_cma_mem(char *p)
 260 +{
 261 +       unsigned int new_size;
 262 +       printk(KERN_NOTICE "early_vc_cma_mem(%s)", p);
 263 +       vc_cma_size = memparse(p, &p);
 264 +       vc_cma_initial = vc_cma_size;
 265 +       if (*p == '/')
 266 +               vc_cma_size = memparse(p + 1, &p);
 267 +       if (*p == '@')
 268 +               vc_cma_base = memparse(p + 1, &p);
 269 +
 270 +       new_size = (vc_cma_size - ((-vc_cma_base) & (VC_CMA_CHUNK_SIZE - 1)))
 271 +           & ~(VC_CMA_CHUNK_SIZE - 1);
 272 +       if (new_size > vc_cma_size)
 273 +               vc_cma_size = 0;
 274 +       vc_cma_initial = (vc_cma_initial + VC_CMA_CHUNK_SIZE - 1)
 275 +           & ~(VC_CMA_CHUNK_SIZE - 1);
 276 +       if (vc_cma_initial > vc_cma_size)
 277 +               vc_cma_initial = vc_cma_size;
 278 +       vc_cma_base = (vc_cma_base + VC_CMA_CHUNK_SIZE - 1)
 279 +           & ~(VC_CMA_CHUNK_SIZE - 1);
 280 +
 281 +       printk(KERN_NOTICE " -> initial %x, size %x, base %x", vc_cma_initial,
 282 +              vc_cma_size, (unsigned int)vc_cma_base);
 283 +
 284 +       return 0;
 285 +}
 286 +
 287 +early_param("vc-cma-mem", early_vc_cma_mem);
 288 +
 289 +void vc_cma_early_init(void)
 290 +{
 291 +       LOG_DBG("vc_cma_early_init - vc_cma_chunks = %d", vc_cma_chunks);
 292 +       if (vc_cma_size) {
 293 +               int rc = platform_device_register(&vc_cma_device);
 294 +               LOG_DBG("platform_device_register -> %d", rc);
 295 +       }
 296 +}
 297 +
 298 +void vc_cma_reserve(void)
 299 +{
 300 +       /* if vc_cma_size is set, then declare vc CMA area of the same
 301 +        * size from the end of memory
 302 +        */
 303 +       if (vc_cma_size) {
 304 +               if (dma_declare_contiguous(NULL /*&vc_cma_device.dev*/, vc_cma_size,
 305 +                                          vc_cma_base, 0) == 0) {
 306 +               } else {
 307 +                       LOG_ERR("vc_cma: dma_declare_contiguous(%x,%x) failed",
 308 +                               vc_cma_size, (unsigned int)vc_cma_base);
 309 +                       vc_cma_size = 0;
 310 +               }
 311 +       }
 312 +       vc_cma_chunks = vc_cma_size / VC_CMA_CHUNK_SIZE;
 313 +}
 314 +
 315 +/****************************************************************************
 316 +*
 317 +*   vc_cma_open
 318 +*
 319 +***************************************************************************/
 320 +
 321 +static int vc_cma_open(struct inode *inode, struct file *file)
 322 +{
 323 +       (void)inode;
 324 +       (void)file;
 325 +
 326 +       return 0;
 327 +}
 328 +
 329 +/****************************************************************************
 330 +*
 331 +*   vc_cma_release
 332 +*
 333 +***************************************************************************/
 334 +
 335 +static int vc_cma_release(struct inode *inode, struct file *file)
 336 +{
 337 +       (void)inode;
 338 +       (void)file;
 339 +
 340 +       vc_cma_set_reserve(0, current->tgid);
 341 +
 342 +       return 0;
 343 +}
 344 +
 345 +/****************************************************************************
 346 +*
 347 +*   vc_cma_ioctl
 348 +*
 349 +***************************************************************************/
 350 +
 351 +static long vc_cma_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
 352 +{
 353 +       int rc = 0;
 354 +
 355 +       (void)cmd;
 356 +       (void)arg;
 357 +
 358 +       switch (cmd) {
 359 +       case VC_CMA_IOC_RESERVE:
 360 +               rc = vc_cma_set_reserve((unsigned int)arg, current->tgid);
 361 +               if (rc >= 0)
 362 +                       rc = 0;
 363 +               break;
 364 +       default:
 365 +               LOG_ERR("vc-cma: Unknown ioctl %x", cmd);
 366 +               return -ENOTTY;
 367 +       }
 368 +
 369 +       return rc;
 370 +}
 371 +
 372 +/****************************************************************************
 373 +*
 374 +*   File Operations for the driver.
 375 +*
 376 +***************************************************************************/
 377 +
 378 +static const struct file_operations vc_cma_fops = {
 379 +       .owner = THIS_MODULE,
 380 +       .open = vc_cma_open,
 381 +       .release = vc_cma_release,
 382 +       .unlocked_ioctl = vc_cma_ioctl,
 383 +};
 384 +
 385 +/****************************************************************************
 386 +*
 387 +*   vc_cma_proc_open
 388 +*
 389 +***************************************************************************/
 390 +
 391 +static int vc_cma_show_info(struct seq_file *m, void *v)
 392 +{
 393 +       int i;
 394 +
 395 +       seq_printf(m, "Videocore CMA:\n");
 396 +       seq_printf(m, "   Base       : %08x\n", (unsigned int)vc_cma_base);
 397 +       seq_printf(m, "   Length     : %08x\n", vc_cma_size);
 398 +       seq_printf(m, "   Initial    : %08x\n", vc_cma_initial);
 399 +       seq_printf(m, "   Chunk size : %08x\n", VC_CMA_CHUNK_SIZE);
 400 +       seq_printf(m, "   Chunks     : %4d (%d bytes)\n",
 401 +                  (int)vc_cma_chunks,
 402 +                  (int)(vc_cma_chunks * VC_CMA_CHUNK_SIZE));
 403 +       seq_printf(m, "   Used       : %4d (%d bytes)\n",
 404 +                  (int)vc_cma_chunks_used,
 405 +                  (int)(vc_cma_chunks_used * VC_CMA_CHUNK_SIZE));
 406 +       seq_printf(m, "   Reserved   : %4d (%d bytes)\n",
 407 +                  (unsigned int)vc_cma_chunks_reserved,
 408 +                  (int)(vc_cma_chunks_reserved * VC_CMA_CHUNK_SIZE));
 409 +
 410 +       for (i = 0; i < vc_cma_reserve_count; i++) {
 411 +               struct vc_cma_reserve_user *user = &vc_cma_reserve_users[i];
 412 +               seq_printf(m, "     PID %5d: %d bytes\n", user->pid,
 413 +                          user->reserve);
 414 +       }
 415 +
 416 +       seq_printf(m, "\n");
 417 +
 418 +       return 0;
 419 +}
 420 +
 421 +static int vc_cma_proc_open(struct inode *inode, struct file *file)
 422 +{
 423 +       return single_open(file, vc_cma_show_info, NULL);
 424 +}
 425 +
 426 +/****************************************************************************
 427 +*
 428 +*   vc_cma_proc_write
 429 +*
 430 +***************************************************************************/
 431 +
 432 +static int vc_cma_proc_write(struct file *file,
 433 +                            const char __user *buffer,
 434 +                            size_t size, loff_t *ppos)
 435 +{
 436 +       int rc = -EFAULT;
 437 +       char input_str[20];
 438 +
 439 +       memset(input_str, 0, sizeof(input_str));
 440 +
 441 +       if (size > sizeof(input_str)) {
 442 +               LOG_ERR("%s: input string length too long", __func__);
 443 +               goto out;
 444 +       }
 445 +
 446 +       if (copy_from_user(input_str, buffer, size - 1)) {
 447 +               LOG_ERR("%s: failed to get input string", __func__);
 448 +               goto out;
 449 +       }
 450 +#define ALLOC_STR "alloc"
 451 +#define FREE_STR "free"
 452 +#define DEBUG_STR "debug"
 453 +#define RESERVE_STR "reserve"
 454 +       if (strncmp(input_str, ALLOC_STR, strlen(ALLOC_STR)) == 0) {
 455 +               int size;
 456 +               char *p = input_str + strlen(ALLOC_STR);
 457 +
 458 +               while (*p == ' ')
 459 +                       p++;
 460 +               size = memparse(p, NULL);
 461 +               LOG_ERR("/proc/vc-cma: alloc %d", size);
 462 +               if (size)
 463 +                       send_vc_msg(VC_CMA_MSG_REQUEST_FREE,
 464 +                                   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 size;
 470 +               char *p = input_str + strlen(FREE_STR);
 471 +
 472 +               while (*p == ' ')
 473 +                       p++;
 474 +               size = memparse(p, NULL);
 475 +               LOG_ERR("/proc/vc-cma: free %d", size);
 476 +               if (size)
 477 +                       send_vc_msg(VC_CMA_MSG_REQUEST_ALLOC,
 478 +                                   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_ERR("/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 size;
 494 +               int reserved;
 495 +               char *p = input_str + strlen(RESERVE_STR);
 496 +               while (*p == ' ')
 497 +                       p++;
 498 +               size = memparse(p, NULL);
 499 +
 500 +               reserved = vc_cma_set_reserve(size, current->tgid);
 501 +               rc = (reserved >= 0) ? size : reserved;
 502 +       }
 503 +
 504 +out:
 505 +       return rc;
 506 +}
 507 +
 508 +/****************************************************************************
 509 +*
 510 +*   File Operations for /proc interface.
 511 +*
 512 +***************************************************************************/
 513 +
 514 +static const struct file_operations vc_cma_proc_fops = {
 515 +       .open = vc_cma_proc_open,
 516 +       .read = seq_read,
 517 +       .write = vc_cma_proc_write,
 518 +       .llseek = seq_lseek,
 519 +       .release = single_release
 520 +};
 521 +
 522 +static int vc_cma_set_reserve(unsigned int reserve, unsigned int pid)
 523 +{
 524 +       struct vc_cma_reserve_user *user = NULL;
 525 +       int delta = 0;
 526 +       int i;
 527 +
 528 +       if (down_interruptible(&vc_cma_reserve_mutex))
 529 +               return -ERESTARTSYS;
 530 +
 531 +       for (i = 0; i < vc_cma_reserve_count; i++) {
 532 +               if (pid == vc_cma_reserve_users[i].pid) {
 533 +                       user = &vc_cma_reserve_users[i];
 534 +                       delta = reserve - user->reserve;
 535 +                       if (reserve)
 536 +                               user->reserve = reserve;
 537 +                       else {
 538 +                               /* Remove this entry by copying downwards */
 539 +                               while ((i + 1) < vc_cma_reserve_count) {
 540 +                                       user[0].pid = user[1].pid;
 541 +                                       user[0].reserve = user[1].reserve;
 542 +                                       user++;
 543 +                                       i++;
 544 +                               }
 545 +                               vc_cma_reserve_count--;
 546 +                               user = NULL;
 547 +                       }
 548 +                       break;
 549 +               }
 550 +       }
 551 +
 552 +       if (reserve && !user) {
 553 +               if (vc_cma_reserve_count == VC_CMA_RESERVE_COUNT_MAX) {
 554 +                       LOG_ERR("vc-cma: Too many reservations - "
 555 +                               "increase CMA_RESERVE_COUNT_MAX");
 556 +                       up(&vc_cma_reserve_mutex);
 557 +                       return -EBUSY;
 558 +               }
 559 +               user = &vc_cma_reserve_users[vc_cma_reserve_count];
 560 +               user->pid = pid;
 561 +               user->reserve = reserve;
 562 +               delta = reserve;
 563 +               vc_cma_reserve_count++;
 564 +       }
 565 +
 566 +       vc_cma_reserve_total += delta;
 567 +
 568 +       send_vc_msg(VC_CMA_MSG_RESERVE,
 569 +                   vc_cma_reserve_total & 0xffff, vc_cma_reserve_total >> 16);
 570 +
 571 +       send_worker_msg((VCHIQ_HEADER_T *) VC_CMA_MSG_UPDATE_RESERVE);
 572 +
 573 +       LOG_DBG("/proc/vc-cma: reserve %d (PID %d) - total %u",
 574 +               reserve, pid, vc_cma_reserve_total);
 575 +
 576 +       up(&vc_cma_reserve_mutex);
 577 +
 578 +       return vc_cma_reserve_total;
 579 +}
 580 +
 581 +static VCHIQ_STATUS_T cma_service_callback(VCHIQ_REASON_T reason,
 582 +                                          VCHIQ_HEADER_T * header,
 583 +                                          VCHIQ_SERVICE_HANDLE_T service,
 584 +                                          void *bulk_userdata)
 585 +{
 586 +       switch (reason) {
 587 +       case VCHIQ_MESSAGE_AVAILABLE:
 588 +               if (!send_worker_msg(header))
 589 +                       return VCHIQ_RETRY;
 590 +               break;
 591 +       case VCHIQ_SERVICE_CLOSED:
 592 +               LOG_DBG("CMA service closed");
 593 +               break;
 594 +       default:
 595 +               LOG_ERR("Unexpected CMA callback reason %d", reason);
 596 +               break;
 597 +       }
 598 +       return VCHIQ_SUCCESS;
 599 +}
 600 +
 601 +static void send_vc_msg(unsigned short type,
 602 +                       unsigned short param1, unsigned short param2)
 603 +{
 604 +       unsigned short msg[] = { type, param1, param2 };
 605 +       VCHIQ_ELEMENT_T elem = { &msg, sizeof(msg) };
 606 +       VCHIQ_STATUS_T ret;
 607 +       vchiq_use_service(cma_service);
 608 +       ret = vchiq_queue_message(cma_service, &elem, 1);
 609 +       vchiq_release_service(cma_service);
 610 +       if (ret != VCHIQ_SUCCESS)
 611 +               LOG_ERR("vchiq_queue_message returned %x", ret);
 612 +}
 613 +
 614 +static bool send_worker_msg(VCHIQ_HEADER_T * msg)
 615 +{
 616 +       if (down_interruptible(&vc_cma_worker_queue_push_mutex))
 617 +               return false;
 618 +       vchiu_queue_push(&cma_msg_queue, msg);
 619 +       up(&vc_cma_worker_queue_push_mutex);
 620 +       return true;
 621 +}
 622 +
 623 +static int vc_cma_alloc_chunks(int num_chunks, struct cma_msg *reply)
 624 +{
 625 +       int i;
 626 +       for (i = 0; i < num_chunks; i++) {
 627 +               struct page *chunk;
 628 +               unsigned int chunk_num;
 629 +               uint8_t *chunk_addr;
 630 +               size_t chunk_size = PAGES_PER_CHUNK << PAGE_SHIFT;
 631 +
 632 +               chunk = dma_alloc_from_contiguous(NULL /*&vc_cma_device.dev*/,
 633 +                                                 PAGES_PER_CHUNK,
 634 +                                                 VC_CMA_CHUNK_ORDER);
 635 +               if (!chunk)
 636 +                       break;
 637 +
 638 +               chunk_addr = page_address(chunk);
 639 +               dmac_flush_range(chunk_addr, chunk_addr + chunk_size);
 640 +               outer_inv_range(__pa(chunk_addr), __pa(chunk_addr) +
 641 +                       chunk_size);
 642 +
 643 +               chunk_num =
 644 +                   (page_to_phys(chunk) - vc_cma_base) / VC_CMA_CHUNK_SIZE;
 645 +               BUG_ON(((page_to_phys(chunk) - vc_cma_base) %
 646 +                       VC_CMA_CHUNK_SIZE) != 0);
 647 +               if (chunk_num >= vc_cma_chunks) {
 648 +                       LOG_ERR("%s: ===============================",
 649 +                               __func__);
 650 +                       LOG_ERR("%s: chunk phys %x, vc_cma %x-%x - "
 651 +                               "bad SPARSEMEM configuration?",
 652 +                               __func__, (unsigned int)page_to_phys(chunk),
 653 +                               vc_cma_base, vc_cma_base + vc_cma_size - 1);
 654 +                       LOG_ERR("%s: dev->cma_area = %p\n", __func__,
 655 +                               vc_cma_device.dev.cma_area);
 656 +                       LOG_ERR("%s: ===============================",
 657 +                               __func__);
 658 +                       break;
 659 +               }
 660 +               reply->params[i] = chunk_num;
 661 +               vc_cma_chunks_used++;
 662 +       }
 663 +
 664 +       if (i < num_chunks) {
 665 +               LOG_ERR("%s: dma_alloc_from_contiguous failed "
 666 +                       "for %x bytes (alloc %d of %d, %d free)",
 667 +                       __func__, VC_CMA_CHUNK_SIZE, i,
 668 +                       num_chunks, vc_cma_chunks - vc_cma_chunks_used);
 669 +               num_chunks = i;
 670 +       }
 671 +
 672 +       LOG_DBG("CMA allocated %d chunks -> %d used",
 673 +               num_chunks, vc_cma_chunks_used);
 674 +       reply->type = VC_CMA_MSG_ALLOCATED;
 675 +
 676 +       {
 677 +               VCHIQ_ELEMENT_T elem = {
 678 +                       reply,
 679 +                       offsetof(struct cma_msg, params[0]) +
 680 +                           num_chunks * sizeof(reply->params[0])
 681 +               };
 682 +               VCHIQ_STATUS_T ret;
 683 +               vchiq_use_service(cma_service);
 684 +               ret = vchiq_queue_message(cma_service, &elem, 1);
 685 +               vchiq_release_service(cma_service);
 686 +               if (ret != VCHIQ_SUCCESS)
 687 +                       LOG_ERR("vchiq_queue_message return " "%x", ret);
 688 +       }
 689 +
 690 +       return num_chunks;
 691 +}
 692 +
 693 +static int cma_worker_proc(void *param)
 694 +{
 695 +       static struct cma_msg reply;
 696 +       (void)param;
 697 +
 698 +       while (1) {
 699 +               VCHIQ_HEADER_T *msg;
 700 +               static struct cma_msg msg_copy;
 701 +               struct cma_msg *cma_msg = &msg_copy;
 702 +               int type, msg_size;
 703 +
 704 +               msg = vchiu_queue_pop(&cma_msg_queue);
 705 +               if ((unsigned int)msg >= VC_CMA_MSG_MAX) {
 706 +                       msg_size = msg->size;
 707 +                       memcpy(&msg_copy, msg->data, msg_size);
 708 +                       type = cma_msg->type;
 709 +                       vchiq_release_message(cma_service, msg);
 710 +               } else {
 711 +                       msg_size = 0;
 712 +                       type = (int)msg;
 713 +                       if (type == VC_CMA_MSG_QUIT)
 714 +                               break;
 715 +                       else if (type == VC_CMA_MSG_UPDATE_RESERVE) {
 716 +                               msg = NULL;
 717 +                               cma_msg = NULL;
 718 +                       } else {
 719 +                               BUG();
 720 +                               continue;
 721 +                       }
 722 +               }
 723 +
 724 +               switch (type) {
 725 +               case VC_CMA_MSG_ALLOC:{
 726 +                               int num_chunks, free_chunks;
 727 +                               num_chunks = cma_msg->params[0];
 728 +                               free_chunks =
 729 +                                   vc_cma_chunks - vc_cma_chunks_used;
 730 +                               LOG_DBG("CMA_MSG_ALLOC(%d chunks)", num_chunks);
 731 +                               if (num_chunks > VC_CMA_MAX_PARAMS_PER_MSG) {
 732 +                                       LOG_ERR
 733 +                                           ("CMA_MSG_ALLOC - chunk count (%d) "
 734 +                                            "exceeds VC_CMA_MAX_PARAMS_PER_MSG (%d)",
 735 +                                            num_chunks,
 736 +                                            VC_CMA_MAX_PARAMS_PER_MSG);
 737 +                                       num_chunks = VC_CMA_MAX_PARAMS_PER_MSG;
 738 +                               }
 739 +
 740 +                               if (num_chunks > free_chunks) {
 741 +                                       LOG_ERR
 742 +                                           ("CMA_MSG_ALLOC - chunk count (%d) "
 743 +                                            "exceeds free chunks (%d)",
 744 +                                            num_chunks, free_chunks);
 745 +                                       num_chunks = free_chunks;
 746 +                               }
 747 +
 748 +                               vc_cma_alloc_chunks(num_chunks, &reply);
 749 +                       }
 750 +                       break;
 751 +
 752 +               case VC_CMA_MSG_FREE:{
 753 +                               int chunk_count =
 754 +                                   (msg_size -
 755 +                                    offsetof(struct cma_msg,
 756 +                                             params)) /
 757 +                                   sizeof(cma_msg->params[0]);
 758 +                               int i;
 759 +                               BUG_ON(chunk_count <= 0);
 760 +
 761 +                               LOG_DBG("CMA_MSG_FREE(%d chunks - %x, ...)",
 762 +                                       chunk_count, cma_msg->params[0]);
 763 +                               for (i = 0; i < chunk_count; i++) {
 764 +                                       int chunk_num = cma_msg->params[i];
 765 +                                       struct page *page = vc_cma_base_page +
 766 +                                           chunk_num * PAGES_PER_CHUNK;
 767 +                                       if (chunk_num >= vc_cma_chunks) {
 768 +                                               LOG_ERR
 769 +                                                   ("CMA_MSG_FREE - chunk %d of %d"
 770 +                                                    " (value %x) exceeds maximum "
 771 +                                                    "(%x)", i, chunk_count,
 772 +                                                    chunk_num,
 773 +                                                    vc_cma_chunks - 1);
 774 +                                               break;
 775 +                                       }
 776 +
 777 +                                       if (!dma_release_from_contiguous
 778 +                                           (NULL /*&vc_cma_device.dev*/, page,
 779 +                                            PAGES_PER_CHUNK)) {
 780 +                                               LOG_ERR
 781 +                                                   ("CMA_MSG_FREE - failed to "
 782 +                                                    "release chunk %d (phys %x, "
 783 +                                                    "page %x)", chunk_num,
 784 +                                                    page_to_phys(page),
 785 +                                                    (unsigned int)page);
 786 +                                       }
 787 +                                       vc_cma_chunks_used--;
 788 +                               }
 789 +                               LOG_DBG("CMA released %d chunks -> %d used",
 790 +                                       i, vc_cma_chunks_used);
 791 +                       }
 792 +                       break;
 793 +
 794 +               case VC_CMA_MSG_UPDATE_RESERVE:{
 795 +                               int chunks_needed =
 796 +                                   ((vc_cma_reserve_total + VC_CMA_CHUNK_SIZE -
 797 +                                     1)
 798 +                                    / VC_CMA_CHUNK_SIZE) -
 799 +                                   vc_cma_chunks_reserved;
 800 +
 801 +                               LOG_DBG
 802 +                                   ("CMA_MSG_UPDATE_RESERVE(%d chunks needed)",
 803 +                                    chunks_needed);
 804 +
 805 +                               /* Cap the reservations to what is available */
 806 +                               if (chunks_needed > 0) {
 807 +                                       if (chunks_needed >
 808 +                                           (vc_cma_chunks -
 809 +                                            vc_cma_chunks_used))
 810 +                                               chunks_needed =
 811 +                                                   (vc_cma_chunks -
 812 +                                                    vc_cma_chunks_used);
 813 +
 814 +                                       chunks_needed =
 815 +                                           vc_cma_alloc_chunks(chunks_needed,
 816 +                                                               &reply);
 817 +                               }
 818 +
 819 +                               LOG_DBG
 820 +                                   ("CMA_MSG_UPDATE_RESERVE(%d chunks allocated)",
 821 +                                    chunks_needed);
 822 +                               vc_cma_chunks_reserved += chunks_needed;
 823 +                       }
 824 +                       break;
 825 +
 826 +               default:
 827 +                       LOG_ERR("unexpected msg type %d", type);
 828 +                       break;
 829 +               }
 830 +       }
 831 +
 832 +       LOG_DBG("quitting...");
 833 +       return 0;
 834 +}
 835 +
 836 +/****************************************************************************
 837 +*
 838 +*   vc_cma_connected_init
 839 +*
 840 +*   This function is called once the videocore has been connected.
 841 +*
 842 +***************************************************************************/
 843 +
 844 +static void vc_cma_connected_init(void)
 845 +{
 846 +       VCHIQ_SERVICE_PARAMS_T service_params;
 847 +
 848 +       LOG_DBG("vc_cma_connected_init");
 849 +
 850 +       if (!vchiu_queue_init(&cma_msg_queue, 16)) {
 851 +               LOG_ERR("could not create CMA msg queue");
 852 +               goto fail_queue;
 853 +       }
 854 +
 855 +       if (vchiq_initialise(&cma_instance) != VCHIQ_SUCCESS)
 856 +               goto fail_vchiq_init;
 857 +
 858 +       vchiq_connect(cma_instance);
 859 +
 860 +       service_params.fourcc = VC_CMA_FOURCC;
 861 +       service_params.callback = cma_service_callback;
 862 +       service_params.userdata = NULL;
 863 +       service_params.version = VC_CMA_VERSION;
 864 +       service_params.version_min = VC_CMA_VERSION;
 865 +
 866 +       if (vchiq_open_service(cma_instance, &service_params,
 867 +                              &cma_service) != VCHIQ_SUCCESS) {
 868 +               LOG_ERR("failed to open service - already in use?");
 869 +               goto fail_vchiq_open;
 870 +       }
 871 +
 872 +       vchiq_release_service(cma_service);
 873 +
 874 +       cma_worker = kthread_create(cma_worker_proc, NULL, "cma_worker");
 875 +       if (!cma_worker) {
 876 +               LOG_ERR("could not create CMA worker thread");
 877 +               goto fail_worker;
 878 +       }
 879 +       set_user_nice(cma_worker, -20);
 880 +       wake_up_process(cma_worker);
 881 +
 882 +       return;
 883 +
 884 +fail_worker:
 885 +       vchiq_close_service(cma_service);
 886 +fail_vchiq_open:
 887 +       vchiq_shutdown(cma_instance);
 888 +fail_vchiq_init:
 889 +       vchiu_queue_delete(&cma_msg_queue);
 890 +fail_queue:
 891 +       return;
 892 +}
 893 +
 894 +void
 895 +loud_error_header(void)
 896 +{
 897 +       if (in_loud_error)
 898 +               return;
 899 +
 900 +       LOG_ERR("============================================================"
 901 +               "================");
 902 +       LOG_ERR("============================================================"
 903 +               "================");
 904 +       LOG_ERR("=====");
 905 +
 906 +       in_loud_error = 1;
 907 +}
 908 +
 909 +void
 910 +loud_error_footer(void)
 911 +{
 912 +       if (!in_loud_error)
 913 +               return;
 914 +
 915 +       LOG_ERR("=====");
 916 +       LOG_ERR("============================================================"
 917 +               "================");
 918 +       LOG_ERR("============================================================"
 919 +               "================");
 920 +
 921 +       in_loud_error = 0;
 922 +}
 923 +
 924 +#if 1
 925 +static int check_cma_config(void) { return 1; }
 926 +#else
 927 +static int
 928 +read_vc_debug_var(VC_MEM_ACCESS_HANDLE_T handle,
 929 +       const char *symbol,
 930 +       void *buf, size_t bufsize)
 931 +{
 932 +       VC_MEM_ADDR_T vcMemAddr;
 933 +       size_t vcMemSize;
 934 +       uint8_t *mapAddr;
 935 +       off_t  vcMapAddr;
 936 +
 937 +       if (!LookupVideoCoreSymbol(handle, symbol,
 938 +               &vcMemAddr,
 939 +               &vcMemSize)) {
 940 +               loud_error_header();
 941 +               loud_error(
 942 +                       "failed to find VC symbol \"%s\".",
 943 +                       symbol);
 944 +               loud_error_footer();
 945 +               return 0;
 946 +       }
 947 +
 948 +       if (vcMemSize != bufsize) {
 949 +               loud_error_header();
 950 +               loud_error(
 951 +                       "VC symbol \"%s\" is the wrong size.",
 952 +                       symbol);
 953 +               loud_error_footer();
 954 +               return 0;
 955 +       }
 956 +
 957 +       vcMapAddr = (off_t)vcMemAddr & VC_MEM_TO_ARM_ADDR_MASK;
 958 +       vcMapAddr += mm_vc_mem_phys_addr;
 959 +       mapAddr = ioremap_nocache(vcMapAddr, vcMemSize);
 960 +       if (mapAddr == 0) {
 961 +               loud_error_header();
 962 +               loud_error(
 963 +                       "failed to ioremap \"%s\" @ 0x%x "
 964 +                       "(phys: 0x%x, size: %u).",
 965 +                       symbol,
 966 +                       (unsigned int)vcMapAddr,
 967 +                       (unsigned int)vcMemAddr,
 968 +                       (unsigned int)vcMemSize);
 969 +               loud_error_footer();
 970 +               return 0;
 971 +       }
 972 +
 973 +       memcpy(buf, mapAddr, bufsize);
 974 +       iounmap(mapAddr);
 975 +
 976 +       return 1;
 977 +}
 978 +
 979 +
 980 +static int
 981 +check_cma_config(void)
 982 +{
 983 +       VC_MEM_ACCESS_HANDLE_T mem_hndl;
 984 +       VC_MEM_ADDR_T mempool_start;
 985 +       VC_MEM_ADDR_T mempool_end;
 986 +       VC_MEM_ADDR_T mempool_offline_start;
 987 +       VC_MEM_ADDR_T mempool_offline_end;
 988 +       VC_MEM_ADDR_T cam_alloc_base;
 989 +       VC_MEM_ADDR_T cam_alloc_size;
 990 +       VC_MEM_ADDR_T cam_alloc_end;
 991 +       int success = 0;
 992 +
 993 +       if (OpenVideoCoreMemory(&mem_hndl) != 0)
 994 +               goto out;
 995 +
 996 +       /* Read the relevant VideoCore variables */
 997 +       if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_START",
 998 +               &mempool_start,
 999 +               sizeof(mempool_start)))
1000 +               goto close;
1001 +
1002 +       if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_END",
1003 +               &mempool_end,
1004 +               sizeof(mempool_end)))
1005 +               goto close;
1006 +
1007 +       if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_OFFLINE_START",
1008 +               &mempool_offline_start,
1009 +               sizeof(mempool_offline_start)))
1010 +               goto close;
1011 +
1012 +       if (!read_vc_debug_var(mem_hndl, "__MEMPOOL_OFFLINE_END",
1013 +               &mempool_offline_end,
1014 +               sizeof(mempool_offline_end)))
1015 +               goto close;
1016 +
1017 +       if (!read_vc_debug_var(mem_hndl, "cam_alloc_base",
1018 +               &cam_alloc_base,
1019 +               sizeof(cam_alloc_base)))
1020 +               goto close;
1021 +
1022 +       if (!read_vc_debug_var(mem_hndl, "cam_alloc_size",
1023 +               &cam_alloc_size,
1024 +               sizeof(cam_alloc_size)))
1025 +               goto close;
1026 +
1027 +       cam_alloc_end = cam_alloc_base + cam_alloc_size;
1028 +
1029 +       success = 1;
1030 +
1031 +       /* Now the sanity checks */
1032 +       if (!mempool_offline_start)
1033 +               mempool_offline_start = mempool_start;
1034 +       if (!mempool_offline_end)
1035 +               mempool_offline_end = mempool_end;
1036 +
1037 +       if (VCADDR_TO_PHYSADDR(mempool_offline_start) != vc_cma_base) {
1038 +               loud_error_header();
1039 +               loud_error(
1040 +                       "__MEMPOOL_OFFLINE_START(%x -> %lx) doesn't match "
1041 +                       "vc_cma_base(%x)",
1042 +                       mempool_offline_start,
1043 +                       VCADDR_TO_PHYSADDR(mempool_offline_start),
1044 +                       vc_cma_base);
1045 +               success = 0;
1046 +       }
1047 +
1048 +       if (VCADDR_TO_PHYSADDR(mempool_offline_end) !=
1049 +               (vc_cma_base + vc_cma_size)) {
1050 +               loud_error_header();
1051 +               loud_error(
1052 +                       "__MEMPOOL_OFFLINE_END(%x -> %lx) doesn't match "
1053 +                       "vc_cma_base(%x) + vc_cma_size(%x) = %x",
1054 +                       mempool_offline_start,
1055 +                       VCADDR_TO_PHYSADDR(mempool_offline_end),
1056 +                       vc_cma_base, vc_cma_size, vc_cma_base + vc_cma_size);
1057 +               success = 0;
1058 +       }
1059 +
1060 +       if (mempool_end < mempool_start) {
1061 +               loud_error_header();
1062 +               loud_error(
1063 +                       "__MEMPOOL_END(%x) must not be before "
1064 +                       "__MEMPOOL_START(%x)",
1065 +                       mempool_end,
1066 +                       mempool_start);
1067 +               success = 0;
1068 +       }
1069 +
1070 +       if (mempool_offline_end < mempool_offline_start) {
1071 +               loud_error_header();
1072 +               loud_error(
1073 +                       "__MEMPOOL_OFFLINE_END(%x) must not be before "
1074 +                       "__MEMPOOL_OFFLINE_START(%x)",
1075 +                       mempool_offline_end,
1076 +                       mempool_offline_start);
1077 +               success = 0;
1078 +       }
1079 +
1080 +       if (mempool_offline_start < mempool_start) {
1081 +               loud_error_header();
1082 +               loud_error(
1083 +                       "__MEMPOOL_OFFLINE_START(%x) must not be before "
1084 +                       "__MEMPOOL_START(%x)",
1085 +                       mempool_offline_start,
1086 +                       mempool_start);
1087 +               success = 0;
1088 +       }
1089 +
1090 +       if (mempool_offline_end > mempool_end) {
1091 +               loud_error_header();
1092 +               loud_error(
1093 +                       "__MEMPOOL_OFFLINE_END(%x) must not be after "
1094 +                       "__MEMPOOL_END(%x)",
1095 +                       mempool_offline_end,
1096 +                       mempool_end);
1097 +               success = 0;
1098 +       }
1099 +
1100 +       if ((cam_alloc_base < mempool_end) &&
1101 +               (cam_alloc_end > mempool_start)) {
1102 +               loud_error_header();
1103 +               loud_error(
1104 +                       "cam_alloc pool(%x-%x) overlaps "
1105 +                       "mempool(%x-%x)",
1106 +                       cam_alloc_base, cam_alloc_end,
1107 +                       mempool_start, mempool_end);
1108 +               success = 0;
1109 +       }
1110 +
1111 +       loud_error_footer();
1112 +
1113 +close:
1114 +       CloseVideoCoreMemory(mem_hndl);
1115 +
1116 +out:
1117 +       return success;
1118 +}
1119 +#endif
1120 +
1121 +static int vc_cma_init(void)
1122 +{
1123 +       int rc = -EFAULT;
1124 +       struct device *dev;
1125 +
1126 +       if (!check_cma_config())
1127 +               goto out_release;
1128 +
1129 +       printk(KERN_INFO "vc-cma: Videocore CMA driver\n");
1130 +       printk(KERN_INFO "vc-cma: vc_cma_base      = 0x%08x\n", vc_cma_base);
1131 +       printk(KERN_INFO "vc-cma: vc_cma_size      = 0x%08x (%u MiB)\n",
1132 +              vc_cma_size, vc_cma_size / (1024 * 1024));
1133 +       printk(KERN_INFO "vc-cma: vc_cma_initial   = 0x%08x (%u MiB)\n",
1134 +              vc_cma_initial, vc_cma_initial / (1024 * 1024));
1135 +
1136 +       vc_cma_base_page = phys_to_page(vc_cma_base);
1137 +
1138 +       if (vc_cma_chunks) {
1139 +               int chunks_needed = vc_cma_initial / VC_CMA_CHUNK_SIZE;
1140 +
1141 +               for (vc_cma_chunks_used = 0;
1142 +                    vc_cma_chunks_used < chunks_needed; vc_cma_chunks_used++) {
1143 +                       struct page *chunk;
1144 +                       chunk = dma_alloc_from_contiguous(NULL /*&vc_cma_device.dev*/,
1145 +                                                         PAGES_PER_CHUNK,
1146 +                                                         VC_CMA_CHUNK_ORDER);
1147 +                       if (!chunk)
1148 +                               break;
1149 +                       BUG_ON(((page_to_phys(chunk) - vc_cma_base) %
1150 +                               VC_CMA_CHUNK_SIZE) != 0);
1151 +               }
1152 +               if (vc_cma_chunks_used != chunks_needed) {
1153 +                       LOG_ERR("%s: dma_alloc_from_contiguous failed (%d "
1154 +                               "bytes, allocation %d of %d)",
1155 +                               __func__, VC_CMA_CHUNK_SIZE,
1156 +                               vc_cma_chunks_used, chunks_needed);
1157 +                       goto out_release;
1158 +               }
1159 +
1160 +               vchiq_add_connected_callback(vc_cma_connected_init);
1161 +       }
1162 +
1163 +       rc = alloc_chrdev_region(&vc_cma_devnum, 0, 1, DRIVER_NAME);
1164 +       if (rc < 0) {
1165 +               LOG_ERR("%s: alloc_chrdev_region failed (rc=%d)", __func__, rc);
1166 +               goto out_release;
1167 +       }
1168 +
1169 +       cdev_init(&vc_cma_cdev, &vc_cma_fops);
1170 +       rc = cdev_add(&vc_cma_cdev, vc_cma_devnum, 1);
1171 +       if (rc != 0) {
1172 +               LOG_ERR("%s: cdev_add failed (rc=%d)", __func__, rc);
1173 +               goto out_unregister;
1174 +       }
1175 +
1176 +       vc_cma_class = class_create(THIS_MODULE, DRIVER_NAME);
1177 +       if (IS_ERR(vc_cma_class)) {
1178 +               rc = PTR_ERR(vc_cma_class);
1179 +               LOG_ERR("%s: class_create failed (rc=%d)", __func__, rc);
1180 +               goto out_cdev_del;
1181 +       }
1182 +
1183 +       dev = device_create(vc_cma_class, NULL, vc_cma_devnum, NULL,
1184 +                           DRIVER_NAME);
1185 +       if (IS_ERR(dev)) {
1186 +               rc = PTR_ERR(dev);
1187 +               LOG_ERR("%s: device_create failed (rc=%d)", __func__, rc);
1188 +               goto out_class_destroy;
1189 +       }
1190 +
1191 +       vc_cma_proc_entry = proc_create(DRIVER_NAME, 0444, NULL, &vc_cma_proc_fops);
1192 +       if (vc_cma_proc_entry == NULL) {
1193 +               rc = -EFAULT;
1194 +               LOG_ERR("%s: proc_create failed", __func__);
1195 +               goto out_device_destroy;
1196 +       }
1197 +
1198 +       vc_cma_inited = 1;
1199 +       return 0;
1200 +
1201 +out_device_destroy:
1202 +       device_destroy(vc_cma_class, vc_cma_devnum);
1203 +
1204 +out_class_destroy:
1205 +       class_destroy(vc_cma_class);
1206 +       vc_cma_class = NULL;
1207 +
1208 +out_cdev_del:
1209 +       cdev_del(&vc_cma_cdev);
1210 +
1211 +out_unregister:
1212 +       unregister_chrdev_region(vc_cma_devnum, 1);
1213 +
1214 +out_release:
1215 +       /* It is tempting to try to clean up by calling
1216 +          dma_release_from_contiguous for all allocated chunks, but it isn't
1217 +          a very safe thing to do. If vc_cma_initial is non-zero it is because
1218 +          VideoCore is already using that memory, so giving it back to Linux
1219 +          is likely to be fatal.
1220 +        */
1221 +       return -1;
1222 +}
1223 +
1224 +/****************************************************************************
1225 +*
1226 +*   vc_cma_exit
1227 +*
1228 +***************************************************************************/
1229 +
1230 +static void __exit vc_cma_exit(void)
1231 +{
1232 +       LOG_DBG("%s: called", __func__);
1233 +
1234 +       if (vc_cma_inited) {
1235 +               remove_proc_entry(DRIVER_NAME, NULL);
1236 +               device_destroy(vc_cma_class, vc_cma_devnum);
1237 +               class_destroy(vc_cma_class);
1238 +               cdev_del(&vc_cma_cdev);
1239 +               unregister_chrdev_region(vc_cma_devnum, 1);
1240 +       }
1241 +}
1242 +
1243 +module_init(vc_cma_init);
1244 +module_exit(vc_cma_exit);
1245 +MODULE_LICENSE("GPL");
1246 +MODULE_AUTHOR("Broadcom Corporation");
1247 diff --git a/drivers/misc/Makefile b/drivers/misc/Makefile
1248 index d72aaf2..24b40c3 100644
1249 --- a/drivers/misc/Makefile
1250 +++ b/drivers/misc/Makefile
1251 @@ -53,4 +53,4 @@ obj-$(CONFIG_INTEL_MEI)               += mei/
1252  obj-$(CONFIG_VMWARE_VMCI)      += vmw_vmci/
1253  obj-$(CONFIG_LATTICE_ECP3_CONFIG)      += lattice-ecp3-config.o
1254  obj-$(CONFIG_SRAM)             += sram.o
1255 -obj-y                          += vc04_services/
1256 +obj-$(CONFIG_BCM2708_VCHIQ)    += vc04_services/
1257 diff --git a/include/linux/broadcom/vc_cma.h b/include/linux/broadcom/vc_cma.h
1258 new file mode 100644
1259 index 0000000..bdc9d79
1260 --- /dev/null
1261 +++ b/include/linux/broadcom/vc_cma.h
1262 @@ -0,0 +1,30 @@
1263 +/*****************************************************************************
1264 +* Copyright 2012 Broadcom Corporation.  All rights reserved.
1265 +*
1266 +* Unless you and Broadcom execute a separate written software license
1267 +* agreement governing use of this software, this software is licensed to you
1268 +* under the terms of the GNU General Public License version 2, available at
1269 +* http://www.broadcom.com/licenses/GPLv2.php (the "GPL").
1270 +*
1271 +* Notwithstanding the above, under no circumstances may you combine this
1272 +* software in any way with any other Broadcom software provided under a
1273 +* license other than the GPL, without Broadcom's express prior written
1274 +* consent.
1275 +*****************************************************************************/
1276 +
1277 +#if !defined( VC_CMA_H )
1278 +#define VC_CMA_H
1279 +
1280 +#include <linux/ioctl.h>
1281 +
1282 +#define VC_CMA_IOC_MAGIC 0xc5
1283 +
1284 +#define VC_CMA_IOC_RESERVE _IO(VC_CMA_IOC_MAGIC, 0)
1285 +
1286 +#ifdef __KERNEL__
1287 +extern void __init vc_cma_early_init(void);
1288 +extern void __init vc_cma_reserve(void);
1289 +#endif
1290 +
1291 +#endif /* VC_CMA_H */
1292 +
1293 --
1294 1.9.1
1295