LXR linux/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 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
  11void 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}
  38IWL_EXPORT_SYMBOL(iwl_free_fw_paging);
  39
  40static 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
 108static 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        dma_sync_single_for_device(fwrt->trans->dev,
 156                                   fwrt->fw_paging_db[0].fw_paging_phys,
 157                                   fwrt->fw_paging_db[0].fw_paging_size,
 158                                   DMA_BIDIRECTIONAL);
 159
 160        IWL_DEBUG_FW(fwrt,
 161                     "Paging: copied %d CSS bytes to first block\n",
 162                     fwrt->fw_paging_db[0].fw_paging_size);
 163
 164        sec_idx++;
 165
 166        /*
 167         * Copy the paging blocks to the dram.  The loop index starts
 168         * from 1 since the CSS block (index 0) was already copied to
 169         * dram.  We use num_of_paging_blk + 1 to account for that.
 170         */
 171        for (idx = 1; idx < fwrt->num_of_paging_blk + 1; idx++) {
 172                struct iwl_fw_paging *block = &fwrt->fw_paging_db[idx];
 173                int remaining = image->sec[sec_idx].len - offset;
 174                int len = block->fw_paging_size;
 175
 176                /*
 177                 * For the last block, we copy all that is remaining,
 178                 * for all other blocks, we copy fw_paging_size at a
 179                 * time. */
 180                if (idx == fwrt->num_of_paging_blk) {
 181                        len = remaining;
 182                        if (remaining !=
 183                            fwrt->num_of_pages_in_last_blk * FW_PAGING_SIZE) {
 184                                IWL_ERR(fwrt,
 185                                        "Paging: last block contains more data than expected %d\n",
 186                                        remaining);
 187                                ret = -EINVAL;
 188                                goto err;
 189                        }
 190                } else if (block->fw_paging_size > remaining) {
 191                        IWL_ERR(fwrt,
 192                                "Paging: not enough data in other in block %d (%d)\n",
 193                                idx, remaining);
 194                        ret = -EINVAL;
 195                        goto err;
 196                }
 197
 198                memcpy(page_address(block->fw_paging_block),
 199                       image->sec[sec_idx].data + offset, len);
 200                dma_sync_single_for_device(fwrt->trans->dev,
 201                                           block->fw_paging_phys,
 202                                           block->fw_paging_size,
 203                                           DMA_BIDIRECTIONAL);
 204
 205                IWL_DEBUG_FW(fwrt,
 206                             "Paging: copied %d paging bytes to block %d\n",
 207                             len, idx);
 208
 209                offset += block->fw_paging_size;
 210        }
 211
 212        return 0;
 213
 214err:
 215        iwl_free_fw_paging(fwrt);
 216        return ret;
 217}
 218
 219static int iwl_save_fw_paging(struct iwl_fw_runtime *fwrt,
 220                              const struct fw_img *fw)
 221{
 222        int ret;
 223
 224        ret = iwl_alloc_fw_paging_mem(fwrt, fw);
 225        if (ret)
 226                return ret;
 227
 228        return iwl_fill_paging_mem(fwrt, fw);
 229}
 230
 231/* send paging cmd to FW in case CPU2 has paging image */
 232static int iwl_send_paging_cmd(struct iwl_fw_runtime *fwrt,
 233                               const struct fw_img *fw)
 234{
 235        struct iwl_fw_paging_cmd paging_cmd = {
 236                .flags = cpu_to_le32(PAGING_CMD_IS_SECURED |
 237                                     PAGING_CMD_IS_ENABLED |
 238                                     (fwrt->num_of_pages_in_last_blk <<
 239                                      PAGING_CMD_NUM_OF_PAGES_IN_LAST_GRP_POS)),
 240                .block_size = cpu_to_le32(BLOCK_2_EXP_SIZE),
 241                .block_num = cpu_to_le32(fwrt->num_of_paging_blk),
 242        };
 243        struct iwl_host_cmd hcmd = {
 244                .id = iwl_cmd_id(FW_PAGING_BLOCK_CMD, IWL_ALWAYS_LONG_GROUP, 0),
 245                .len = { sizeof(paging_cmd), },
 246                .data = { &paging_cmd, },
 247        };
 248        int blk_idx;
 249
 250        /* loop for for all paging blocks + CSS block */
 251        for (blk_idx = 0; blk_idx < fwrt->num_of_paging_blk + 1; blk_idx++) {
 252                dma_addr_t addr = fwrt->fw_paging_db[blk_idx].fw_paging_phys;
 253                __le32 phy_addr;
 254
 255                addr = addr >> PAGE_2_EXP_SIZE;
 256                phy_addr = cpu_to_le32(addr);
 257                paging_cmd.device_phy_addr[blk_idx] = phy_addr;
 258        }
 259
 260        return iwl_trans_send_cmd(fwrt->trans, &hcmd);
 261}
 262
 263int iwl_init_paging(struct iwl_fw_runtime *fwrt, enum iwl_ucode_type type)
 264{
 265        const struct fw_img *fw = &fwrt->fw->img[type];
 266        int ret;
 267
 268        if (fwrt->trans->trans_cfg->gen2)
 269                return 0;
 270
 271        /*
 272         * Configure and operate fw paging mechanism.
 273         * The driver configures the paging flow only once.
 274         * The CPU2 paging image is included in the IWL_UCODE_INIT image.
 275         */
 276        if (!fw->paging_mem_size)
 277                return 0;
 278
 279        ret = iwl_save_fw_paging(fwrt, fw);
 280        if (ret) {
 281                IWL_ERR(fwrt, "failed to save the FW paging image\n");
 282                return ret;
 283        }
 284
 285        ret = iwl_send_paging_cmd(fwrt, fw);
 286        if (ret) {
 287                IWL_ERR(fwrt, "failed to send the paging cmd\n");
 288                iwl_free_fw_paging(fwrt);
 289                return ret;
 290        }
 291
 292        return 0;
 293}
 294IWL_EXPORT_SYMBOL(iwl_init_paging);
 295