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

   1 // SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause
   2 /*
   3  * Copyright (C) 2012-2014, 2018-2019, 2021 Intel Corporation
   4  * Copyright (C) 2013-2015 Intel Mobile Communications GmbH
   5  * Copyright (C) 2016-2017 Intel Deutschland GmbH
   6  */
   7 #include "iwl-drv.h"
   8 #include "runtime.h"
   9 #include "fw/api/commands.h"
  10
  11 void iwl_free_fw_paging(struct iwl_fw_runtime *fwrt)
  12 {
  13         int i;
  14
  15         if (!fwrt->fw_paging_db[0].fw_paging_block)
  16                 return;
  17
  18         for (i = 0; i < NUM_OF_FW_PAGING_BLOCKS; i++) {
  19                 struct iwl_fw_paging *paging = &fwrt->fw_paging_db[i];
  20
  21                 if (!paging->fw_paging_block) {
  22                         IWL_DEBUG_FW(fwrt,
  23                                      "Paging: block %d already freed, continue to next page\n",
  24                                      i);
  25
  26                         continue;
  27                 }
  28                 dma_unmap_page(fwrt->trans->dev, paging->fw_paging_phys,
  29                                paging->fw_paging_size, DMA_BIDIRECTIONAL);
  30
  31                 __free_pages(paging->fw_paging_block,
  32                              get_order(paging->fw_paging_size));
  33                 paging->fw_paging_block = NULL;
  34         }
  35
  36         memset(fwrt->fw_paging_db, 0, sizeof(fwrt->fw_paging_db));
  37 }
  38 IWL_EXPORT_SYMBOL(iwl_free_fw_paging);
  39
  40 static int iwl_alloc_fw_paging_mem(struct iwl_fw_runtime *fwrt,
  41                                    const struct fw_img *image)
  42 {
  43         struct page *block;
  44         dma_addr_t phys = 0;
  45         int blk_idx, order, num_of_pages, size;
  46
  47         if (fwrt->fw_paging_db[0].fw_paging_block)
  48                 return 0;
  49
  50         /* ensure BLOCK_2_EXP_SIZE is power of 2 of PAGING_BLOCK_SIZE */
  51         BUILD_BUG_ON(BIT(BLOCK_2_EXP_SIZE) != PAGING_BLOCK_SIZE);
  52
  53         num_of_pages = image->paging_mem_size / FW_PAGING_SIZE;
  54         fwrt->num_of_paging_blk =
  55                 DIV_ROUND_UP(num_of_pages, NUM_OF_PAGE_PER_GROUP);
  56         fwrt->num_of_pages_in_last_blk =
  57                 num_of_pages -
  58                 NUM_OF_PAGE_PER_GROUP * (fwrt->num_of_paging_blk - 1);
  59
  60         IWL_DEBUG_FW(fwrt,
  61                      "Paging: allocating mem for %d paging blocks, each block holds 8 pages, last block holds %d pages\n",
  62                      fwrt->num_of_paging_blk,
  63                      fwrt->num_of_pages_in_last_blk);
  64
  65         /*
  66          * Allocate CSS and paging blocks in dram.
  67          */
  68         for (blk_idx = 0; blk_idx < fwrt->num_of_paging_blk + 1; blk_idx++) {
  69                 /* For CSS allocate 4KB, for others PAGING_BLOCK_SIZE (32K) */
  70                 size = blk_idx ? PAGING_BLOCK_SIZE : FW_PAGING_SIZE;
  71                 order = get_order(size);
  72                 block = alloc_pages(GFP_KERNEL, order);
  73                 if (!block) {
  74                         /* free all the previous pages since we failed */
  75                         iwl_free_fw_paging(fwrt);
  76                         return -ENOMEM;
  77                 }
  78
  79                 fwrt->fw_paging_db[blk_idx].fw_paging_block = block;
  80                 fwrt->fw_paging_db[blk_idx].fw_paging_size = size;
  81
  82                 phys = dma_map_page(fwrt->trans->dev, block, 0,
  83                                     PAGE_SIZE << order,
  84                                     DMA_BIDIRECTIONAL);
  85                 if (dma_mapping_error(fwrt->trans->dev, phys)) {
  86                         /*
  87                          * free the previous pages and the current one
  88                          * since we failed to map_page.
  89                          */
  90                         iwl_free_fw_paging(fwrt);
  91                         return -ENOMEM;
  92                 }
  93                 fwrt->fw_paging_db[blk_idx].fw_paging_phys = phys;
  94
  95                 if (!blk_idx)
  96                         IWL_DEBUG_FW(fwrt,
  97                                      "Paging: allocated 4K(CSS) bytes (order %d) for firmware paging.\n",
  98                                      order);
  99                 else
 100                         IWL_DEBUG_FW(fwrt,
 101                                      "Paging: allocated 32K bytes (order %d) for firmware paging.\n",
 102                                      order);
 103         }
 104
 105         return 0;
 106 }
 107
 108 static int iwl_fill_paging_mem(struct iwl_fw_runtime *fwrt,
 109                                const struct fw_img *image)
 110 {
 111         int sec_idx, idx, ret;
 112         u32 offset = 0;
 113
 114         /*
 115          * find where is the paging image start point:
 116          * if CPU2 exist and it's in paging format, then the image looks like:
 117          * CPU1 sections (2 or more)
 118          * CPU1_CPU2_SEPARATOR_SECTION delimiter - separate between CPU1 to CPU2
 119          * CPU2 sections (not paged)
 120          * PAGING_SEPARATOR_SECTION delimiter - separate between CPU2
 121          * non paged to CPU2 paging sec
 122          * CPU2 paging CSS
 123          * CPU2 paging image (including instruction and data)
 124          */
 125         for (sec_idx = 0; sec_idx < image->num_sec; sec_idx++) {
 126                 if (image->sec[sec_idx].offset == PAGING_SEPARATOR_SECTION) {
 127                         sec_idx++;
 128                         break;
 129                 }
 130         }
 131
 132         /*
 133          * If paging is enabled there should be at least 2 more sections left
 134          * (one for CSS and one for Paging data)
 135          */
 136         if (sec_idx >= image->num_sec - 1) {
 137                 IWL_ERR(fwrt, "Paging: Missing CSS and/or paging sections\n");
 138                 ret = -EINVAL;
 139                 goto err;
 140         }
 141
 142         /* copy the CSS block to the dram */
 143         IWL_DEBUG_FW(fwrt, "Paging: load paging CSS to FW, sec = %d\n",
 144                      sec_idx);
 145
 146         if (image->sec[sec_idx].len > fwrt->fw_paging_db[0].fw_paging_size) {
 147                 IWL_ERR(fwrt, "CSS block is larger than paging size\n");
 148                 ret = -EINVAL;
 149                 goto err;
 150         }
 151
 152         memcpy(page_address(fwrt->fw_paging_db[0].fw_paging_block),
 153                image->sec[sec_idx].data,
 154                image->sec[sec_idx].len);
 155         fwrt->fw_paging_db[0].fw_offs = image->sec[sec_idx].offset;
 156         dma_sync_single_for_device(fwrt->trans->dev,
 157                                    fwrt->fw_paging_db[0].fw_paging_phys,
 158                                    fwrt->fw_paging_db[0].fw_paging_size,
 159                                    DMA_BIDIRECTIONAL);
 160
 161         IWL_DEBUG_FW(fwrt,
 162                      "Paging: copied %d CSS bytes to first block\n",
 163                      fwrt->fw_paging_db[0].fw_paging_size);
 164
 165         sec_idx++;
 166
 167         /*
 168          * Copy the paging blocks to the dram.  The loop index starts
 169          * from 1 since the CSS block (index 0) was already copied to
 170          * dram.  We use num_of_paging_blk + 1 to account for that.
 171          */
 172         for (idx = 1; idx < fwrt->num_of_paging_blk + 1; idx++) {
 173                 struct iwl_fw_paging *block = &fwrt->fw_paging_db[idx];
 174                 int remaining = image->sec[sec_idx].len - offset;
 175                 int len = block->fw_paging_size;
 176
 177                 /*
 178                  * For the last block, we copy all that is remaining,
 179                  * for all other blocks, we copy fw_paging_size at a
 180                  * time. */
 181                 if (idx == fwrt->num_of_paging_blk) {
 182                         len = remaining;
 183                         if (remaining !=
 184                             fwrt->num_of_pages_in_last_blk * FW_PAGING_SIZE) {
 185                                 IWL_ERR(fwrt,
 186                                         "Paging: last block contains more data than expected %d\n",
 187                                         remaining);
 188                                 ret = -EINVAL;
 189                                 goto err;
 190                         }
 191                 } else if (block->fw_paging_size > remaining) {
 192                         IWL_ERR(fwrt,
 193                                 "Paging: not enough data in other in block %d (%d)\n",
 194                                 idx, remaining);
 195                         ret = -EINVAL;
 196                         goto err;
 197                 }
 198
 199                 memcpy(page_address(block->fw_paging_block),
 200                        (const u8 *)image->sec[sec_idx].data + offset, len);
 201                 block->fw_offs = image->sec[sec_idx].offset + offset;
 202                 dma_sync_single_for_device(fwrt->trans->dev,
 203                                            block->fw_paging_phys,
 204                                            block->fw_paging_size,
 205                                            DMA_BIDIRECTIONAL);
 206
 207                 IWL_DEBUG_FW(fwrt,
 208                              "Paging: copied %d paging bytes to block %d\n",
 209                              len, idx);
 210
 211                 offset += block->fw_paging_size;
 212         }
 213
 214         return 0;
 215
 216 err:
 217         iwl_free_fw_paging(fwrt);
 218         return ret;
 219 }
 220
 221 static int iwl_save_fw_paging(struct iwl_fw_runtime *fwrt,
 222                               const struct fw_img *fw)
 223 {
 224         int ret;
 225
 226         ret = iwl_alloc_fw_paging_mem(fwrt, fw);
 227         if (ret)
 228                 return ret;
 229
 230         return iwl_fill_paging_mem(fwrt, fw);
 231 }
 232
 233 /* send paging cmd to FW in case CPU2 has paging image */
 234 static int iwl_send_paging_cmd(struct iwl_fw_runtime *fwrt,
 235                                const struct fw_img *fw)
 236 {
 237         struct iwl_fw_paging_cmd paging_cmd = {
 238                 .flags = cpu_to_le32(PAGING_CMD_IS_SECURED |
 239                                      PAGING_CMD_IS_ENABLED |
 240                                      (fwrt->num_of_pages_in_last_blk <<
 241                                       PAGING_CMD_NUM_OF_PAGES_IN_LAST_GRP_POS)),
 242                 .block_size = cpu_to_le32(BLOCK_2_EXP_SIZE),
 243                 .block_num = cpu_to_le32(fwrt->num_of_paging_blk),
 244         };
 245         struct iwl_host_cmd hcmd = {
 246                 .id = WIDE_ID(IWL_ALWAYS_LONG_GROUP, FW_PAGING_BLOCK_CMD),
 247                 .len = { sizeof(paging_cmd), },
 248                 .data = { &paging_cmd, },
 249         };
 250         int blk_idx;
 251
 252         /* loop for all paging blocks + CSS block */
 253         for (blk_idx = 0; blk_idx < fwrt->num_of_paging_blk + 1; blk_idx++) {
 254                 dma_addr_t addr = fwrt->fw_paging_db[blk_idx].fw_paging_phys;
 255                 __le32 phy_addr;
 256
 257                 addr = addr >> PAGE_2_EXP_SIZE;
 258                 phy_addr = cpu_to_le32(addr);
 259                 paging_cmd.device_phy_addr[blk_idx] = phy_addr;
 260         }
 261
 262         return iwl_trans_send_cmd(fwrt->trans, &hcmd);
 263 }
 264
 265 int iwl_init_paging(struct iwl_fw_runtime *fwrt, enum iwl_ucode_type type)
 266 {
 267         const struct fw_img *fw = &fwrt->fw->img[type];
 268         int ret;
 269
 270         if (fwrt->trans->trans_cfg->gen2)
 271                 return 0;
 272
 273         /*
 274          * Configure and operate fw paging mechanism.
 275          * The driver configures the paging flow only once.
 276          * The CPU2 paging image is included in the IWL_UCODE_INIT image.
 277          */
 278         if (!fw->paging_mem_size)
 279                 return 0;
 280
 281         ret = iwl_save_fw_paging(fwrt, fw);
 282         if (ret) {
 283                 IWL_ERR(fwrt, "failed to save the FW paging image\n");
 284                 return ret;
 285         }
 286
 287         ret = iwl_send_paging_cmd(fwrt, fw);
 288         if (ret) {
 289                 IWL_ERR(fwrt, "failed to send the paging cmd\n");
 290                 iwl_free_fw_paging(fwrt);
 291                 return ret;
 292         }
 293
 294         return 0;
 295 }
 296 IWL_EXPORT_SYMBOL(iwl_init_paging);