drivers/net/wireless/intel/iwlwifi/fw/paging.c

   1 /******************************************************************************
   2  *
   3  * This file is provided under a dual BSD/GPLv2 license.  When using or
   4  * redistributing this file, you may do so under either license.
   5  *
   6  * GPL LICENSE SUMMARY
   7  *
   8  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
   9  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  10  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
  11  * Copyright(c) 2018        Intel Corporation
  12  *
  13  * This program is free software; you can redistribute it and/or modify
  14  * it under the terms of version 2 of the GNU General Public License as
  15  * published by the Free Software Foundation.
  16  *
  17  * This program is distributed in the hope that it will be useful, but
  18  * WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  20  * General Public License for more details.
  21  *
  22  * The full GNU General Public License is included in this distribution
  23  * in the file called COPYING.
  24  *
  25  * Contact Information:
  26  *  Intel Linux Wireless <linuxwifi@intel.com>
  27  * Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
  28  *
  29  * BSD LICENSE
  30  *
  31  * Copyright(c) 2012 - 2014 Intel Corporation. All rights reserved.
  32  * Copyright(c) 2013 - 2015 Intel Mobile Communications GmbH
  33  * Copyright(c) 2016 - 2017 Intel Deutschland GmbH
  34  * Copyright(c) 2018        Intel Corporation
  35  * All rights reserved.
  36  *
  37  * Redistribution and use in source and binary forms, with or without
  38  * modification, are permitted provided that the following conditions
  39  * are met:
  40  *
  41  *  * Redistributions of source code must retain the above copyright
  42  *    notice, this list of conditions and the following disclaimer.
  43  *  * Redistributions in binary form must reproduce the above copyright
  44  *    notice, this list of conditions and the following disclaimer in
  45  *    the documentation and/or other materials provided with the
  46  *    distribution.
  47  *  * Neither the name Intel Corporation nor the names of its
  48  *    contributors may be used to endorse or promote products derived
  49  *    from this software without specific prior written permission.
  50  *
  51  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  52  * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  53  * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  54  * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  55  * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  56  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  57  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  58  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  59  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  60  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  61  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  62  *
  63  *****************************************************************************/
  64 #include "iwl-drv.h"
  65 #include "runtime.h"
  66 #include "fw/api/commands.h"
  67
  68 void iwl_free_fw_paging(struct iwl_fw_runtime *fwrt)
  69 {
  70         int i;
  71
  72         if (!fwrt->fw_paging_db[0].fw_paging_block)
  73                 return;
  74
  75         for (i = 0; i < NUM_OF_FW_PAGING_BLOCKS; i++) {
  76                 struct iwl_fw_paging *paging = &fwrt->fw_paging_db[i];
  77
  78                 if (!paging->fw_paging_block) {
  79                         IWL_DEBUG_FW(fwrt,
  80                                      "Paging: block %d already freed, continue to next page\n",
  81                                      i);
  82
  83                         continue;
  84                 }
  85                 dma_unmap_page(fwrt->trans->dev, paging->fw_paging_phys,
  86                                paging->fw_paging_size, DMA_BIDIRECTIONAL);
  87
  88                 __free_pages(paging->fw_paging_block,
  89                              get_order(paging->fw_paging_size));
  90                 paging->fw_paging_block = NULL;
  91         }
  92
  93         memset(fwrt->fw_paging_db, 0, sizeof(fwrt->fw_paging_db));
  94 }
  95 IWL_EXPORT_SYMBOL(iwl_free_fw_paging);
  96
  97 static int iwl_alloc_fw_paging_mem(struct iwl_fw_runtime *fwrt,
  98                                    const struct fw_img *image)
  99 {
 100         struct page *block;
 101         dma_addr_t phys = 0;
 102         int blk_idx, order, num_of_pages, size;
 103
 104         if (fwrt->fw_paging_db[0].fw_paging_block)
 105                 return 0;
 106
 107         /* ensure BLOCK_2_EXP_SIZE is power of 2 of PAGING_BLOCK_SIZE */
 108         BUILD_BUG_ON(BIT(BLOCK_2_EXP_SIZE) != PAGING_BLOCK_SIZE);
 109
 110         num_of_pages = image->paging_mem_size / FW_PAGING_SIZE;
 111         fwrt->num_of_paging_blk =
 112                 DIV_ROUND_UP(num_of_pages, NUM_OF_PAGE_PER_GROUP);
 113         fwrt->num_of_pages_in_last_blk =
 114                 num_of_pages -
 115                 NUM_OF_PAGE_PER_GROUP * (fwrt->num_of_paging_blk - 1);
 116
 117         IWL_DEBUG_FW(fwrt,
 118                      "Paging: allocating mem for %d paging blocks, each block holds 8 pages, last block holds %d pages\n",
 119                      fwrt->num_of_paging_blk,
 120                      fwrt->num_of_pages_in_last_blk);
 121
 122         /*
 123          * Allocate CSS and paging blocks in dram.
 124          */
 125         for (blk_idx = 0; blk_idx < fwrt->num_of_paging_blk + 1; blk_idx++) {
 126                 /* For CSS allocate 4KB, for others PAGING_BLOCK_SIZE (32K) */
 127                 size = blk_idx ? PAGING_BLOCK_SIZE : FW_PAGING_SIZE;
 128                 order = get_order(size);
 129                 block = alloc_pages(GFP_KERNEL, order);
 130                 if (!block) {
 131                         /* free all the previous pages since we failed */
 132                         iwl_free_fw_paging(fwrt);
 133                         return -ENOMEM;
 134                 }
 135
 136                 fwrt->fw_paging_db[blk_idx].fw_paging_block = block;
 137                 fwrt->fw_paging_db[blk_idx].fw_paging_size = size;
 138
 139                 phys = dma_map_page(fwrt->trans->dev, block, 0,
 140                                     PAGE_SIZE << order,
 141                                     DMA_BIDIRECTIONAL);
 142                 if (dma_mapping_error(fwrt->trans->dev, phys)) {
 143                         /*
 144                          * free the previous pages and the current one
 145                          * since we failed to map_page.
 146                          */
 147                         iwl_free_fw_paging(fwrt);
 148                         return -ENOMEM;
 149                 }
 150                 fwrt->fw_paging_db[blk_idx].fw_paging_phys = phys;
 151
 152                 if (!blk_idx)
 153                         IWL_DEBUG_FW(fwrt,
 154                                      "Paging: allocated 4K(CSS) bytes (order %d) for firmware paging.\n",
 155                                      order);
 156                 else
 157                         IWL_DEBUG_FW(fwrt,
 158                                      "Paging: allocated 32K bytes (order %d) for firmware paging.\n",
 159                                      order);
 160         }
 161
 162         return 0;
 163 }
 164
 165 static int iwl_fill_paging_mem(struct iwl_fw_runtime *fwrt,
 166                                const struct fw_img *image)
 167 {
 168         int sec_idx, idx, ret;
 169         u32 offset = 0;
 170
 171         /*
 172          * find where is the paging image start point:
 173          * if CPU2 exist and it's in paging format, then the image looks like:
 174          * CPU1 sections (2 or more)
 175          * CPU1_CPU2_SEPARATOR_SECTION delimiter - separate between CPU1 to CPU2
 176          * CPU2 sections (not paged)
 177          * PAGING_SEPARATOR_SECTION delimiter - separate between CPU2
 178          * non paged to CPU2 paging sec
 179          * CPU2 paging CSS
 180          * CPU2 paging image (including instruction and data)
 181          */
 182         for (sec_idx = 0; sec_idx < image->num_sec; sec_idx++) {
 183                 if (image->sec[sec_idx].offset == PAGING_SEPARATOR_SECTION) {
 184                         sec_idx++;
 185                         break;
 186                 }
 187         }
 188
 189         /*
 190          * If paging is enabled there should be at least 2 more sections left
 191          * (one for CSS and one for Paging data)
 192          */
 193         if (sec_idx >= image->num_sec - 1) {
 194                 IWL_ERR(fwrt, "Paging: Missing CSS and/or paging sections\n");
 195                 ret = -EINVAL;
 196                 goto err;
 197         }
 198
 199         /* copy the CSS block to the dram */
 200         IWL_DEBUG_FW(fwrt, "Paging: load paging CSS to FW, sec = %d\n",
 201                      sec_idx);
 202
 203         if (image->sec[sec_idx].len > fwrt->fw_paging_db[0].fw_paging_size) {
 204                 IWL_ERR(fwrt, "CSS block is larger than paging size\n");
 205                 ret = -EINVAL;
 206                 goto err;
 207         }
 208
 209         memcpy(page_address(fwrt->fw_paging_db[0].fw_paging_block),
 210                image->sec[sec_idx].data,
 211                image->sec[sec_idx].len);
 212         dma_sync_single_for_device(fwrt->trans->dev,
 213                                    fwrt->fw_paging_db[0].fw_paging_phys,
 214                                    fwrt->fw_paging_db[0].fw_paging_size,
 215                                    DMA_BIDIRECTIONAL);
 216
 217         IWL_DEBUG_FW(fwrt,
 218                      "Paging: copied %d CSS bytes to first block\n",
 219                      fwrt->fw_paging_db[0].fw_paging_size);
 220
 221         sec_idx++;
 222
 223         /*
 224          * Copy the paging blocks to the dram.  The loop index starts
 225          * from 1 since the CSS block (index 0) was already copied to
 226          * dram.  We use num_of_paging_blk + 1 to account for that.
 227          */
 228         for (idx = 1; idx < fwrt->num_of_paging_blk + 1; idx++) {
 229                 struct iwl_fw_paging *block = &fwrt->fw_paging_db[idx];
 230                 int remaining = image->sec[sec_idx].len - offset;
 231                 int len = block->fw_paging_size;
 232
 233                 /*
 234                  * For the last block, we copy all that is remaining,
 235                  * for all other blocks, we copy fw_paging_size at a
 236                  * time. */
 237                 if (idx == fwrt->num_of_paging_blk) {
 238                         len = remaining;
 239                         if (remaining !=
 240                             fwrt->num_of_pages_in_last_blk * FW_PAGING_SIZE) {
 241                                 IWL_ERR(fwrt,
 242                                         "Paging: last block contains more data than expected %d\n",
 243                                         remaining);
 244                                 ret = -EINVAL;
 245                                 goto err;
 246                         }
 247                 } else if (block->fw_paging_size > remaining) {
 248                         IWL_ERR(fwrt,
 249                                 "Paging: not enough data in other in block %d (%d)\n",
 250                                 idx, remaining);
 251                         ret = -EINVAL;
 252                         goto err;
 253                 }
 254
 255                 memcpy(page_address(block->fw_paging_block),
 256                        image->sec[sec_idx].data + offset, len);
 257                 dma_sync_single_for_device(fwrt->trans->dev,
 258                                            block->fw_paging_phys,
 259                                            block->fw_paging_size,
 260                                            DMA_BIDIRECTIONAL);
 261
 262                 IWL_DEBUG_FW(fwrt,
 263                              "Paging: copied %d paging bytes to block %d\n",
 264                              len, idx);
 265
 266                 offset += block->fw_paging_size;
 267         }
 268
 269         return 0;
 270
 271 err:
 272         iwl_free_fw_paging(fwrt);
 273         return ret;
 274 }
 275
 276 static int iwl_save_fw_paging(struct iwl_fw_runtime *fwrt,
 277                               const struct fw_img *fw)
 278 {
 279         int ret;
 280
 281         ret = iwl_alloc_fw_paging_mem(fwrt, fw);
 282         if (ret)
 283                 return ret;
 284
 285         return iwl_fill_paging_mem(fwrt, fw);
 286 }
 287
 288 /* send paging cmd to FW in case CPU2 has paging image */
 289 static int iwl_send_paging_cmd(struct iwl_fw_runtime *fwrt,
 290                                const struct fw_img *fw)
 291 {
 292         struct iwl_fw_paging_cmd paging_cmd = {
 293                 .flags = cpu_to_le32(PAGING_CMD_IS_SECURED |
 294                                      PAGING_CMD_IS_ENABLED |
 295                                      (fwrt->num_of_pages_in_last_blk <<
 296                                       PAGING_CMD_NUM_OF_PAGES_IN_LAST_GRP_POS)),
 297                 .block_size = cpu_to_le32(BLOCK_2_EXP_SIZE),
 298                 .block_num = cpu_to_le32(fwrt->num_of_paging_blk),
 299         };
 300         struct iwl_host_cmd hcmd = {
 301                 .id = iwl_cmd_id(FW_PAGING_BLOCK_CMD, IWL_ALWAYS_LONG_GROUP, 0),
 302                 .len = { sizeof(paging_cmd), },
 303                 .data = { &paging_cmd, },
 304         };
 305         int blk_idx;
 306
 307         /* loop for for all paging blocks + CSS block */
 308         for (blk_idx = 0; blk_idx < fwrt->num_of_paging_blk + 1; blk_idx++) {
 309                 dma_addr_t addr = fwrt->fw_paging_db[blk_idx].fw_paging_phys;
 310                 __le32 phy_addr;
 311
 312                 addr = addr >> PAGE_2_EXP_SIZE;
 313                 phy_addr = cpu_to_le32(addr);
 314                 paging_cmd.device_phy_addr[blk_idx] = phy_addr;
 315         }
 316
 317         return iwl_trans_send_cmd(fwrt->trans, &hcmd);
 318 }
 319
 320 int iwl_init_paging(struct iwl_fw_runtime *fwrt, enum iwl_ucode_type type)
 321 {
 322         const struct fw_img *fw = &fwrt->fw->img[type];
 323         int ret;
 324
 325         if (fwrt->trans->cfg->gen2)
 326                 return 0;
 327
 328         /*
 329          * Configure and operate fw paging mechanism.
 330          * The driver configures the paging flow only once.
 331          * The CPU2 paging image is included in the IWL_UCODE_INIT image.
 332          */
 333         if (!fw->paging_mem_size)
 334                 return 0;
 335
 336         ret = iwl_save_fw_paging(fwrt, fw);
 337         if (ret) {
 338                 IWL_ERR(fwrt, "failed to save the FW paging image\n");
 339                 return ret;
 340         }
 341
 342         ret = iwl_send_paging_cmd(fwrt, fw);
 343         if (ret) {
 344                 IWL_ERR(fwrt, "failed to send the paging cmd\n");
 345                 iwl_free_fw_paging(fwrt);
 346                 return ret;
 347         }
 348
 349         return 0;
 350 }
 351 IWL_EXPORT_SYMBOL(iwl_init_paging);