From ace9429bb58fd418f0c81d4c2835699bddf6bde6 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Thu, 11 Apr 2024 10:27:49 +0200 Subject: Adding upstream version 6.6.15. Signed-off-by: Daniel Baumann --- drivers/remoteproc/remoteproc_elf_loader.c | 395 +++++++++++++++++++++++++++++ 1 file changed, 395 insertions(+) create mode 100644 drivers/remoteproc/remoteproc_elf_loader.c (limited to 'drivers/remoteproc/remoteproc_elf_loader.c') diff --git a/drivers/remoteproc/remoteproc_elf_loader.c b/drivers/remoteproc/remoteproc_elf_loader.c new file mode 100644 index 0000000000..94177e4160 --- /dev/null +++ b/drivers/remoteproc/remoteproc_elf_loader.c @@ -0,0 +1,395 @@ +// SPDX-License-Identifier: GPL-2.0-only +/* + * Remote Processor Framework ELF loader + * + * Copyright (C) 2011 Texas Instruments, Inc. + * Copyright (C) 2011 Google, Inc. + * + * Ohad Ben-Cohen + * Brian Swetland + * Mark Grosen + * Fernando Guzman Lugo + * Suman Anna + * Robert Tivy + * Armando Uribe De Leon + * Sjur Brændeland + */ + +#define pr_fmt(fmt) "%s: " fmt, __func__ + +#include +#include +#include +#include + +#include "remoteproc_internal.h" +#include "remoteproc_elf_helpers.h" + +/** + * rproc_elf_sanity_check() - Sanity Check for ELF32/ELF64 firmware image + * @rproc: the remote processor handle + * @fw: the ELF firmware image + * + * Make sure this fw image is sane (ie a correct ELF32/ELF64 file). + * + * Return: 0 on success and -EINVAL upon any failure + */ +int rproc_elf_sanity_check(struct rproc *rproc, const struct firmware *fw) +{ + const char *name = rproc->firmware; + struct device *dev = &rproc->dev; + /* + * ELF files are beginning with the same structure. Thus, to simplify + * header parsing, we can use the elf32_hdr one for both elf64 and + * elf32. + */ + struct elf32_hdr *ehdr; + u32 elf_shdr_get_size; + u64 phoff, shoff; + char class; + u16 phnum; + + if (!fw) { + dev_err(dev, "failed to load %s\n", name); + return -EINVAL; + } + + if (fw->size < sizeof(struct elf32_hdr)) { + dev_err(dev, "Image is too small\n"); + return -EINVAL; + } + + ehdr = (struct elf32_hdr *)fw->data; + + if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG)) { + dev_err(dev, "Image is corrupted (bad magic)\n"); + return -EINVAL; + } + + class = ehdr->e_ident[EI_CLASS]; + if (class != ELFCLASS32 && class != ELFCLASS64) { + dev_err(dev, "Unsupported class: %d\n", class); + return -EINVAL; + } + + if (class == ELFCLASS64 && fw->size < sizeof(struct elf64_hdr)) { + dev_err(dev, "elf64 header is too small\n"); + return -EINVAL; + } + + /* We assume the firmware has the same endianness as the host */ +# ifdef __LITTLE_ENDIAN + if (ehdr->e_ident[EI_DATA] != ELFDATA2LSB) { +# else /* BIG ENDIAN */ + if (ehdr->e_ident[EI_DATA] != ELFDATA2MSB) { +# endif + dev_err(dev, "Unsupported firmware endianness\n"); + return -EINVAL; + } + + phoff = elf_hdr_get_e_phoff(class, fw->data); + shoff = elf_hdr_get_e_shoff(class, fw->data); + phnum = elf_hdr_get_e_phnum(class, fw->data); + elf_shdr_get_size = elf_size_of_shdr(class); + + if (fw->size < shoff + elf_shdr_get_size) { + dev_err(dev, "Image is too small\n"); + return -EINVAL; + } + + if (phnum == 0) { + dev_err(dev, "No loadable segments\n"); + return -EINVAL; + } + + if (phoff > fw->size) { + dev_err(dev, "Firmware size is too small\n"); + return -EINVAL; + } + + dev_dbg(dev, "Firmware is an elf%d file\n", + class == ELFCLASS32 ? 32 : 64); + + return 0; +} +EXPORT_SYMBOL(rproc_elf_sanity_check); + +/** + * rproc_elf_get_boot_addr() - Get rproc's boot address. + * @rproc: the remote processor handle + * @fw: the ELF firmware image + * + * Note that the boot address is not a configurable property of all remote + * processors. Some will always boot at a specific hard-coded address. + * + * Return: entry point address of the ELF image + * + */ +u64 rproc_elf_get_boot_addr(struct rproc *rproc, const struct firmware *fw) +{ + return elf_hdr_get_e_entry(fw_elf_get_class(fw), fw->data); +} +EXPORT_SYMBOL(rproc_elf_get_boot_addr); + +/** + * rproc_elf_load_segments() - load firmware segments to memory + * @rproc: remote processor which will be booted using these fw segments + * @fw: the ELF firmware image + * + * This function loads the firmware segments to memory, where the remote + * processor expects them. + * + * Some remote processors will expect their code and data to be placed + * in specific device addresses, and can't have them dynamically assigned. + * + * We currently support only those kind of remote processors, and expect + * the program header's paddr member to contain those addresses. We then go + * through the physically contiguous "carveout" memory regions which we + * allocated (and mapped) earlier on behalf of the remote processor, + * and "translate" device address to kernel addresses, so we can copy the + * segments where they are expected. + * + * Currently we only support remote processors that required carveout + * allocations and got them mapped onto their iommus. Some processors + * might be different: they might not have iommus, and would prefer to + * directly allocate memory for every segment/resource. This is not yet + * supported, though. + * + * Return: 0 on success and an appropriate error code otherwise + */ +int rproc_elf_load_segments(struct rproc *rproc, const struct firmware *fw) +{ + struct device *dev = &rproc->dev; + const void *ehdr, *phdr; + int i, ret = 0; + u16 phnum; + const u8 *elf_data = fw->data; + u8 class = fw_elf_get_class(fw); + u32 elf_phdr_get_size = elf_size_of_phdr(class); + + ehdr = elf_data; + phnum = elf_hdr_get_e_phnum(class, ehdr); + phdr = elf_data + elf_hdr_get_e_phoff(class, ehdr); + + /* go through the available ELF segments */ + for (i = 0; i < phnum; i++, phdr += elf_phdr_get_size) { + u64 da = elf_phdr_get_p_paddr(class, phdr); + u64 memsz = elf_phdr_get_p_memsz(class, phdr); + u64 filesz = elf_phdr_get_p_filesz(class, phdr); + u64 offset = elf_phdr_get_p_offset(class, phdr); + u32 type = elf_phdr_get_p_type(class, phdr); + bool is_iomem = false; + void *ptr; + + if (type != PT_LOAD || !memsz) + continue; + + dev_dbg(dev, "phdr: type %d da 0x%llx memsz 0x%llx filesz 0x%llx\n", + type, da, memsz, filesz); + + if (filesz > memsz) { + dev_err(dev, "bad phdr filesz 0x%llx memsz 0x%llx\n", + filesz, memsz); + ret = -EINVAL; + break; + } + + if (offset + filesz > fw->size) { + dev_err(dev, "truncated fw: need 0x%llx avail 0x%zx\n", + offset + filesz, fw->size); + ret = -EINVAL; + break; + } + + if (!rproc_u64_fit_in_size_t(memsz)) { + dev_err(dev, "size (%llx) does not fit in size_t type\n", + memsz); + ret = -EOVERFLOW; + break; + } + + /* grab the kernel address for this device address */ + ptr = rproc_da_to_va(rproc, da, memsz, &is_iomem); + if (!ptr) { + dev_err(dev, "bad phdr da 0x%llx mem 0x%llx\n", da, + memsz); + ret = -EINVAL; + break; + } + + /* put the segment where the remote processor expects it */ + if (filesz) { + if (is_iomem) + memcpy_toio((void __iomem *)ptr, elf_data + offset, filesz); + else + memcpy(ptr, elf_data + offset, filesz); + } + + /* + * Zero out remaining memory for this segment. + * + * This isn't strictly required since dma_alloc_coherent already + * did this for us. albeit harmless, we may consider removing + * this. + */ + if (memsz > filesz) { + if (is_iomem) + memset_io((void __iomem *)(ptr + filesz), 0, memsz - filesz); + else + memset(ptr + filesz, 0, memsz - filesz); + } + } + + return ret; +} +EXPORT_SYMBOL(rproc_elf_load_segments); + +static const void * +find_table(struct device *dev, const struct firmware *fw) +{ + const void *shdr, *name_table_shdr; + int i; + const char *name_table; + struct resource_table *table = NULL; + const u8 *elf_data = (void *)fw->data; + u8 class = fw_elf_get_class(fw); + size_t fw_size = fw->size; + const void *ehdr = elf_data; + u16 shnum = elf_hdr_get_e_shnum(class, ehdr); + u32 elf_shdr_get_size = elf_size_of_shdr(class); + u16 shstrndx = elf_hdr_get_e_shstrndx(class, ehdr); + + /* look for the resource table and handle it */ + /* First, get the section header according to the elf class */ + shdr = elf_data + elf_hdr_get_e_shoff(class, ehdr); + /* Compute name table section header entry in shdr array */ + name_table_shdr = shdr + (shstrndx * elf_shdr_get_size); + /* Finally, compute the name table section address in elf */ + name_table = elf_data + elf_shdr_get_sh_offset(class, name_table_shdr); + + for (i = 0; i < shnum; i++, shdr += elf_shdr_get_size) { + u64 size = elf_shdr_get_sh_size(class, shdr); + u64 offset = elf_shdr_get_sh_offset(class, shdr); + u32 name = elf_shdr_get_sh_name(class, shdr); + + if (strcmp(name_table + name, ".resource_table")) + continue; + + table = (struct resource_table *)(elf_data + offset); + + /* make sure we have the entire table */ + if (offset + size > fw_size || offset + size < size) { + dev_err(dev, "resource table truncated\n"); + return NULL; + } + + /* make sure table has at least the header */ + if (sizeof(struct resource_table) > size) { + dev_err(dev, "header-less resource table\n"); + return NULL; + } + + /* we don't support any version beyond the first */ + if (table->ver != 1) { + dev_err(dev, "unsupported fw ver: %d\n", table->ver); + return NULL; + } + + /* make sure reserved bytes are zeroes */ + if (table->reserved[0] || table->reserved[1]) { + dev_err(dev, "non zero reserved bytes\n"); + return NULL; + } + + /* make sure the offsets array isn't truncated */ + if (struct_size(table, offset, table->num) > size) { + dev_err(dev, "resource table incomplete\n"); + return NULL; + } + + return shdr; + } + + return NULL; +} + +/** + * rproc_elf_load_rsc_table() - load the resource table + * @rproc: the rproc handle + * @fw: the ELF firmware image + * + * This function finds the resource table inside the remote processor's + * firmware, load it into the @cached_table and update @table_ptr. + * + * Return: 0 on success, negative errno on failure. + */ +int rproc_elf_load_rsc_table(struct rproc *rproc, const struct firmware *fw) +{ + const void *shdr; + struct device *dev = &rproc->dev; + struct resource_table *table = NULL; + const u8 *elf_data = fw->data; + size_t tablesz; + u8 class = fw_elf_get_class(fw); + u64 sh_offset; + + shdr = find_table(dev, fw); + if (!shdr) + return -EINVAL; + + sh_offset = elf_shdr_get_sh_offset(class, shdr); + table = (struct resource_table *)(elf_data + sh_offset); + tablesz = elf_shdr_get_sh_size(class, shdr); + + /* + * Create a copy of the resource table. When a virtio device starts + * and calls vring_new_virtqueue() the address of the allocated vring + * will be stored in the cached_table. Before the device is started, + * cached_table will be copied into device memory. + */ + rproc->cached_table = kmemdup(table, tablesz, GFP_KERNEL); + if (!rproc->cached_table) + return -ENOMEM; + + rproc->table_ptr = rproc->cached_table; + rproc->table_sz = tablesz; + + return 0; +} +EXPORT_SYMBOL(rproc_elf_load_rsc_table); + +/** + * rproc_elf_find_loaded_rsc_table() - find the loaded resource table + * @rproc: the rproc handle + * @fw: the ELF firmware image + * + * This function finds the location of the loaded resource table. Don't + * call this function if the table wasn't loaded yet - it's a bug if you do. + * + * Return: pointer to the resource table if it is found or NULL otherwise. + * If the table wasn't loaded yet the result is unspecified. + */ +struct resource_table *rproc_elf_find_loaded_rsc_table(struct rproc *rproc, + const struct firmware *fw) +{ + const void *shdr; + u64 sh_addr, sh_size; + u8 class = fw_elf_get_class(fw); + struct device *dev = &rproc->dev; + + shdr = find_table(&rproc->dev, fw); + if (!shdr) + return NULL; + + sh_addr = elf_shdr_get_sh_addr(class, shdr); + sh_size = elf_shdr_get_sh_size(class, shdr); + + if (!rproc_u64_fit_in_size_t(sh_size)) { + dev_err(dev, "size (%llx) does not fit in size_t type\n", + sh_size); + return NULL; + } + + return rproc_da_to_va(rproc, sh_addr, sh_size, NULL); +} +EXPORT_SYMBOL(rproc_elf_find_loaded_rsc_table); -- cgit v1.2.3