linux/drivers/soc/qcom/mdt_loader.c
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   1/*
   2 * Qualcomm Peripheral Image Loader
   3 *
   4 * Copyright (C) 2016 Linaro Ltd
   5 * Copyright (C) 2015 Sony Mobile Communications Inc
   6 * Copyright (c) 2012-2013, The Linux Foundation. All rights reserved.
   7 *
   8 * This program is free software; you can redistribute it and/or
   9 * modify it under the terms of the GNU General Public License
  10 * version 2 as published by the Free Software Foundation.
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 * GNU General Public License for more details.
  16 */
  17
  18#include <linux/device.h>
  19#include <linux/elf.h>
  20#include <linux/firmware.h>
  21#include <linux/kernel.h>
  22#include <linux/module.h>
  23#include <linux/qcom_scm.h>
  24#include <linux/sizes.h>
  25#include <linux/slab.h>
  26#include <linux/soc/qcom/mdt_loader.h>
  27
  28static bool mdt_phdr_valid(const struct elf32_phdr *phdr)
  29{
  30        if (phdr->p_type != PT_LOAD)
  31                return false;
  32
  33        if ((phdr->p_flags & QCOM_MDT_TYPE_MASK) == QCOM_MDT_TYPE_HASH)
  34                return false;
  35
  36        if (!phdr->p_memsz)
  37                return false;
  38
  39        return true;
  40}
  41
  42/**
  43 * qcom_mdt_get_size() - acquire size of the memory region needed to load mdt
  44 * @fw:         firmware object for the mdt file
  45 *
  46 * Returns size of the loaded firmware blob, or -EINVAL on failure.
  47 */
  48ssize_t qcom_mdt_get_size(const struct firmware *fw)
  49{
  50        const struct elf32_phdr *phdrs;
  51        const struct elf32_phdr *phdr;
  52        const struct elf32_hdr *ehdr;
  53        phys_addr_t min_addr = PHYS_ADDR_MAX;
  54        phys_addr_t max_addr = 0;
  55        int i;
  56
  57        ehdr = (struct elf32_hdr *)fw->data;
  58        phdrs = (struct elf32_phdr *)(ehdr + 1);
  59
  60        for (i = 0; i < ehdr->e_phnum; i++) {
  61                phdr = &phdrs[i];
  62
  63                if (!mdt_phdr_valid(phdr))
  64                        continue;
  65
  66                if (phdr->p_paddr < min_addr)
  67                        min_addr = phdr->p_paddr;
  68
  69                if (phdr->p_paddr + phdr->p_memsz > max_addr)
  70                        max_addr = ALIGN(phdr->p_paddr + phdr->p_memsz, SZ_4K);
  71        }
  72
  73        return min_addr < max_addr ? max_addr - min_addr : -EINVAL;
  74}
  75EXPORT_SYMBOL_GPL(qcom_mdt_get_size);
  76
  77static int __qcom_mdt_load(struct device *dev, const struct firmware *fw,
  78                           const char *firmware, int pas_id, void *mem_region,
  79                           phys_addr_t mem_phys, size_t mem_size,
  80                           phys_addr_t *reloc_base, bool pas_init)
  81{
  82        const struct elf32_phdr *phdrs;
  83        const struct elf32_phdr *phdr;
  84        const struct elf32_hdr *ehdr;
  85        const struct firmware *seg_fw;
  86        phys_addr_t mem_reloc;
  87        phys_addr_t min_addr = PHYS_ADDR_MAX;
  88        phys_addr_t max_addr = 0;
  89        size_t fw_name_len;
  90        ssize_t offset;
  91        char *fw_name;
  92        bool relocate = false;
  93        void *ptr;
  94        int ret;
  95        int i;
  96
  97        if (!fw || !mem_region || !mem_phys || !mem_size)
  98                return -EINVAL;
  99
 100        ehdr = (struct elf32_hdr *)fw->data;
 101        phdrs = (struct elf32_phdr *)(ehdr + 1);
 102
 103        fw_name_len = strlen(firmware);
 104        if (fw_name_len <= 4)
 105                return -EINVAL;
 106
 107        fw_name = kstrdup(firmware, GFP_KERNEL);
 108        if (!fw_name)
 109                return -ENOMEM;
 110
 111        if (pas_init) {
 112                ret = qcom_scm_pas_init_image(pas_id, fw->data, fw->size);
 113                if (ret) {
 114                        dev_err(dev, "invalid firmware metadata\n");
 115                        goto out;
 116                }
 117        }
 118
 119        for (i = 0; i < ehdr->e_phnum; i++) {
 120                phdr = &phdrs[i];
 121
 122                if (!mdt_phdr_valid(phdr))
 123                        continue;
 124
 125                if (phdr->p_flags & QCOM_MDT_RELOCATABLE)
 126                        relocate = true;
 127
 128                if (phdr->p_paddr < min_addr)
 129                        min_addr = phdr->p_paddr;
 130
 131                if (phdr->p_paddr + phdr->p_memsz > max_addr)
 132                        max_addr = ALIGN(phdr->p_paddr + phdr->p_memsz, SZ_4K);
 133        }
 134
 135        if (relocate) {
 136                if (pas_init) {
 137                        ret = qcom_scm_pas_mem_setup(pas_id, mem_phys,
 138                                                     max_addr - min_addr);
 139                        if (ret) {
 140                                dev_err(dev, "unable to setup relocation\n");
 141                                goto out;
 142                        }
 143                }
 144
 145                /*
 146                 * The image is relocatable, so offset each segment based on
 147                 * the lowest segment address.
 148                 */
 149                mem_reloc = min_addr;
 150        } else {
 151                /*
 152                 * Image is not relocatable, so offset each segment based on
 153                 * the allocated physical chunk of memory.
 154                 */
 155                mem_reloc = mem_phys;
 156        }
 157
 158        for (i = 0; i < ehdr->e_phnum; i++) {
 159                phdr = &phdrs[i];
 160
 161                if (!mdt_phdr_valid(phdr))
 162                        continue;
 163
 164                offset = phdr->p_paddr - mem_reloc;
 165                if (offset < 0 || offset + phdr->p_memsz > mem_size) {
 166                        dev_err(dev, "segment outside memory range\n");
 167                        ret = -EINVAL;
 168                        break;
 169                }
 170
 171                ptr = mem_region + offset;
 172
 173                if (phdr->p_filesz) {
 174                        sprintf(fw_name + fw_name_len - 3, "b%02d", i);
 175                        ret = request_firmware_into_buf(&seg_fw, fw_name, dev,
 176                                                        ptr, phdr->p_filesz);
 177                        if (ret) {
 178                                dev_err(dev, "failed to load %s\n", fw_name);
 179                                break;
 180                        }
 181
 182                        release_firmware(seg_fw);
 183                }
 184
 185                if (phdr->p_memsz > phdr->p_filesz)
 186                        memset(ptr + phdr->p_filesz, 0, phdr->p_memsz - phdr->p_filesz);
 187        }
 188
 189        if (reloc_base)
 190                *reloc_base = mem_reloc;
 191
 192out:
 193        kfree(fw_name);
 194
 195        return ret;
 196}
 197
 198/**
 199 * qcom_mdt_load() - load the firmware which header is loaded as fw
 200 * @dev:        device handle to associate resources with
 201 * @fw:         firmware object for the mdt file
 202 * @firmware:   name of the firmware, for construction of segment file names
 203 * @pas_id:     PAS identifier
 204 * @mem_region: allocated memory region to load firmware into
 205 * @mem_phys:   physical address of allocated memory region
 206 * @mem_size:   size of the allocated memory region
 207 * @reloc_base: adjusted physical address after relocation
 208 *
 209 * Returns 0 on success, negative errno otherwise.
 210 */
 211int qcom_mdt_load(struct device *dev, const struct firmware *fw,
 212                  const char *firmware, int pas_id, void *mem_region,
 213                  phys_addr_t mem_phys, size_t mem_size,
 214                  phys_addr_t *reloc_base)
 215{
 216        return __qcom_mdt_load(dev, fw, firmware, pas_id, mem_region, mem_phys,
 217                               mem_size, reloc_base, true);
 218}
 219EXPORT_SYMBOL_GPL(qcom_mdt_load);
 220
 221/**
 222 * qcom_mdt_load_no_init() - load the firmware which header is loaded as fw
 223 * @dev:        device handle to associate resources with
 224 * @fw:         firmware object for the mdt file
 225 * @firmware:   name of the firmware, for construction of segment file names
 226 * @pas_id:     PAS identifier
 227 * @mem_region: allocated memory region to load firmware into
 228 * @mem_phys:   physical address of allocated memory region
 229 * @mem_size:   size of the allocated memory region
 230 * @reloc_base: adjusted physical address after relocation
 231 *
 232 * Returns 0 on success, negative errno otherwise.
 233 */
 234int qcom_mdt_load_no_init(struct device *dev, const struct firmware *fw,
 235                          const char *firmware, int pas_id,
 236                          void *mem_region, phys_addr_t mem_phys,
 237                          size_t mem_size, phys_addr_t *reloc_base)
 238{
 239        return __qcom_mdt_load(dev, fw, firmware, pas_id, mem_region, mem_phys,
 240                               mem_size, reloc_base, false);
 241}
 242EXPORT_SYMBOL_GPL(qcom_mdt_load_no_init);
 243
 244MODULE_DESCRIPTION("Firmware parser for Qualcomm MDT format");
 245MODULE_LICENSE("GPL v2");
 246