13ddd9992SAKASHI Takahiro // SPDX-License-Identifier: GPL-2.0 23ddd9992SAKASHI Takahiro /* 33ddd9992SAKASHI Takahiro * kexec_file for arm64 43ddd9992SAKASHI Takahiro * 53ddd9992SAKASHI Takahiro * Copyright (C) 2018 Linaro Limited 63ddd9992SAKASHI Takahiro * Author: AKASHI Takahiro <takahiro.akashi@linaro.org> 73ddd9992SAKASHI Takahiro * 852b2a8afSAKASHI Takahiro * Most code is derived from arm64 port of kexec-tools 93ddd9992SAKASHI Takahiro */ 103ddd9992SAKASHI Takahiro 113ddd9992SAKASHI Takahiro #define pr_fmt(fmt) "kexec_file: " fmt 123ddd9992SAKASHI Takahiro 1352b2a8afSAKASHI Takahiro #include <linux/ioport.h> 1452b2a8afSAKASHI Takahiro #include <linux/kernel.h> 153ddd9992SAKASHI Takahiro #include <linux/kexec.h> 1652b2a8afSAKASHI Takahiro #include <linux/libfdt.h> 1752b2a8afSAKASHI Takahiro #include <linux/memblock.h> 18*ac10be5cSRob Herring #include <linux/of.h> 1952b2a8afSAKASHI Takahiro #include <linux/of_fdt.h> 203751e728SAKASHI Takahiro #include <linux/slab.h> 2152b2a8afSAKASHI Takahiro #include <linux/string.h> 2252b2a8afSAKASHI Takahiro #include <linux/types.h> 23732291c4SArnd Bergmann #include <linux/vmalloc.h> 243ddd9992SAKASHI Takahiro 253ddd9992SAKASHI Takahiro const struct kexec_file_ops * const kexec_file_loaders[] = { 26f3b70e50SAKASHI Takahiro &kexec_image_ops, 273ddd9992SAKASHI Takahiro NULL 283ddd9992SAKASHI Takahiro }; 2952b2a8afSAKASHI Takahiro 3052b2a8afSAKASHI Takahiro int arch_kimage_file_post_load_cleanup(struct kimage *image) 3152b2a8afSAKASHI Takahiro { 32*ac10be5cSRob Herring kvfree(image->arch.dtb); 3352b2a8afSAKASHI Takahiro image->arch.dtb = NULL; 3452b2a8afSAKASHI Takahiro 357b558cc3SLakshmi Ramasubramanian vfree(image->elf_headers); 367b558cc3SLakshmi Ramasubramanian image->elf_headers = NULL; 377b558cc3SLakshmi Ramasubramanian image->elf_headers_sz = 0; 383751e728SAKASHI Takahiro 3952b2a8afSAKASHI Takahiro return kexec_image_post_load_cleanup_default(image); 4052b2a8afSAKASHI Takahiro } 4152b2a8afSAKASHI Takahiro 423751e728SAKASHI Takahiro static int prepare_elf_headers(void **addr, unsigned long *sz) 433751e728SAKASHI Takahiro { 443751e728SAKASHI Takahiro struct crash_mem *cmem; 453751e728SAKASHI Takahiro unsigned int nr_ranges; 463751e728SAKASHI Takahiro int ret; 473751e728SAKASHI Takahiro u64 i; 483751e728SAKASHI Takahiro phys_addr_t start, end; 493751e728SAKASHI Takahiro 503751e728SAKASHI Takahiro nr_ranges = 1; /* for exclusion of crashkernel region */ 516e245ad4SMike Rapoport for_each_mem_range(i, &start, &end) 523751e728SAKASHI Takahiro nr_ranges++; 533751e728SAKASHI Takahiro 54bf508ec9SGustavo A. R. Silva cmem = kmalloc(struct_size(cmem, ranges, nr_ranges), GFP_KERNEL); 553751e728SAKASHI Takahiro if (!cmem) 563751e728SAKASHI Takahiro return -ENOMEM; 573751e728SAKASHI Takahiro 583751e728SAKASHI Takahiro cmem->max_nr_ranges = nr_ranges; 593751e728SAKASHI Takahiro cmem->nr_ranges = 0; 606e245ad4SMike Rapoport for_each_mem_range(i, &start, &end) { 613751e728SAKASHI Takahiro cmem->ranges[cmem->nr_ranges].start = start; 623751e728SAKASHI Takahiro cmem->ranges[cmem->nr_ranges].end = end - 1; 633751e728SAKASHI Takahiro cmem->nr_ranges++; 643751e728SAKASHI Takahiro } 653751e728SAKASHI Takahiro 663751e728SAKASHI Takahiro /* Exclude crashkernel region */ 673751e728SAKASHI Takahiro ret = crash_exclude_mem_range(cmem, crashk_res.start, crashk_res.end); 683751e728SAKASHI Takahiro 693751e728SAKASHI Takahiro if (!ret) 703751e728SAKASHI Takahiro ret = crash_prepare_elf64_headers(cmem, true, addr, sz); 713751e728SAKASHI Takahiro 723751e728SAKASHI Takahiro kfree(cmem); 733751e728SAKASHI Takahiro return ret; 743751e728SAKASHI Takahiro } 753751e728SAKASHI Takahiro 76108aa503SBenjamin Gwin /* 77108aa503SBenjamin Gwin * Tries to add the initrd and DTB to the image. If it is not possible to find 78108aa503SBenjamin Gwin * valid locations, this function will undo changes to the image and return non 79108aa503SBenjamin Gwin * zero. 80108aa503SBenjamin Gwin */ 8152b2a8afSAKASHI Takahiro int load_other_segments(struct kimage *image, 8252b2a8afSAKASHI Takahiro unsigned long kernel_load_addr, 8352b2a8afSAKASHI Takahiro unsigned long kernel_size, 8452b2a8afSAKASHI Takahiro char *initrd, unsigned long initrd_len, 8552b2a8afSAKASHI Takahiro char *cmdline) 8652b2a8afSAKASHI Takahiro { 8752b2a8afSAKASHI Takahiro struct kexec_buf kbuf; 883751e728SAKASHI Takahiro void *headers, *dtb = NULL; 89108aa503SBenjamin Gwin unsigned long headers_sz, initrd_load_addr = 0, dtb_len, 90108aa503SBenjamin Gwin orig_segments = image->nr_segments; 9152b2a8afSAKASHI Takahiro int ret = 0; 9252b2a8afSAKASHI Takahiro 9352b2a8afSAKASHI Takahiro kbuf.image = image; 9452b2a8afSAKASHI Takahiro /* not allocate anything below the kernel */ 9552b2a8afSAKASHI Takahiro kbuf.buf_min = kernel_load_addr + kernel_size; 9652b2a8afSAKASHI Takahiro 973751e728SAKASHI Takahiro /* load elf core header */ 983751e728SAKASHI Takahiro if (image->type == KEXEC_TYPE_CRASH) { 993751e728SAKASHI Takahiro ret = prepare_elf_headers(&headers, &headers_sz); 1003751e728SAKASHI Takahiro if (ret) { 1013751e728SAKASHI Takahiro pr_err("Preparing elf core header failed\n"); 1023751e728SAKASHI Takahiro goto out_err; 1033751e728SAKASHI Takahiro } 1043751e728SAKASHI Takahiro 1053751e728SAKASHI Takahiro kbuf.buffer = headers; 1063751e728SAKASHI Takahiro kbuf.bufsz = headers_sz; 1073751e728SAKASHI Takahiro kbuf.mem = KEXEC_BUF_MEM_UNKNOWN; 1083751e728SAKASHI Takahiro kbuf.memsz = headers_sz; 1093751e728SAKASHI Takahiro kbuf.buf_align = SZ_64K; /* largest supported page size */ 1103751e728SAKASHI Takahiro kbuf.buf_max = ULONG_MAX; 1113751e728SAKASHI Takahiro kbuf.top_down = true; 1123751e728SAKASHI Takahiro 1133751e728SAKASHI Takahiro ret = kexec_add_buffer(&kbuf); 1143751e728SAKASHI Takahiro if (ret) { 1153751e728SAKASHI Takahiro vfree(headers); 1163751e728SAKASHI Takahiro goto out_err; 1173751e728SAKASHI Takahiro } 1187b558cc3SLakshmi Ramasubramanian image->elf_headers = headers; 1197b558cc3SLakshmi Ramasubramanian image->elf_load_addr = kbuf.mem; 1207b558cc3SLakshmi Ramasubramanian image->elf_headers_sz = headers_sz; 1213751e728SAKASHI Takahiro 1223751e728SAKASHI Takahiro pr_debug("Loaded elf core header at 0x%lx bufsz=0x%lx memsz=0x%lx\n", 1237b558cc3SLakshmi Ramasubramanian image->elf_load_addr, kbuf.bufsz, kbuf.memsz); 1243751e728SAKASHI Takahiro } 1253751e728SAKASHI Takahiro 12652b2a8afSAKASHI Takahiro /* load initrd */ 12752b2a8afSAKASHI Takahiro if (initrd) { 12852b2a8afSAKASHI Takahiro kbuf.buffer = initrd; 12952b2a8afSAKASHI Takahiro kbuf.bufsz = initrd_len; 130c19d050fSBhupesh Sharma kbuf.mem = KEXEC_BUF_MEM_UNKNOWN; 13152b2a8afSAKASHI Takahiro kbuf.memsz = initrd_len; 13252b2a8afSAKASHI Takahiro kbuf.buf_align = 0; 13352b2a8afSAKASHI Takahiro /* within 1GB-aligned window of up to 32GB in size */ 13452b2a8afSAKASHI Takahiro kbuf.buf_max = round_down(kernel_load_addr, SZ_1G) 13552b2a8afSAKASHI Takahiro + (unsigned long)SZ_1G * 32; 13652b2a8afSAKASHI Takahiro kbuf.top_down = false; 13752b2a8afSAKASHI Takahiro 13852b2a8afSAKASHI Takahiro ret = kexec_add_buffer(&kbuf); 13952b2a8afSAKASHI Takahiro if (ret) 14052b2a8afSAKASHI Takahiro goto out_err; 14152b2a8afSAKASHI Takahiro initrd_load_addr = kbuf.mem; 14252b2a8afSAKASHI Takahiro 14352b2a8afSAKASHI Takahiro pr_debug("Loaded initrd at 0x%lx bufsz=0x%lx memsz=0x%lx\n", 14451075e0cSŁukasz Stelmach initrd_load_addr, kbuf.bufsz, kbuf.memsz); 14552b2a8afSAKASHI Takahiro } 14652b2a8afSAKASHI Takahiro 14752b2a8afSAKASHI Takahiro /* load dtb */ 148*ac10be5cSRob Herring dtb = of_kexec_alloc_and_setup_fdt(image, initrd_load_addr, 149*ac10be5cSRob Herring initrd_len, cmdline, 0); 150*ac10be5cSRob Herring if (!dtb) { 15152b2a8afSAKASHI Takahiro pr_err("Preparing for new dtb failed\n"); 15252b2a8afSAKASHI Takahiro goto out_err; 15352b2a8afSAKASHI Takahiro } 15452b2a8afSAKASHI Takahiro 155*ac10be5cSRob Herring /* trim it */ 156*ac10be5cSRob Herring fdt_pack(dtb); 15752b2a8afSAKASHI Takahiro dtb_len = fdt_totalsize(dtb); 15852b2a8afSAKASHI Takahiro kbuf.buffer = dtb; 15952b2a8afSAKASHI Takahiro kbuf.bufsz = dtb_len; 160c19d050fSBhupesh Sharma kbuf.mem = KEXEC_BUF_MEM_UNKNOWN; 16152b2a8afSAKASHI Takahiro kbuf.memsz = dtb_len; 16252b2a8afSAKASHI Takahiro /* not across 2MB boundary */ 16352b2a8afSAKASHI Takahiro kbuf.buf_align = SZ_2M; 16452b2a8afSAKASHI Takahiro kbuf.buf_max = ULONG_MAX; 16552b2a8afSAKASHI Takahiro kbuf.top_down = true; 16652b2a8afSAKASHI Takahiro 16752b2a8afSAKASHI Takahiro ret = kexec_add_buffer(&kbuf); 16852b2a8afSAKASHI Takahiro if (ret) 16952b2a8afSAKASHI Takahiro goto out_err; 17052b2a8afSAKASHI Takahiro image->arch.dtb = dtb; 17152b2a8afSAKASHI Takahiro image->arch.dtb_mem = kbuf.mem; 17252b2a8afSAKASHI Takahiro 17352b2a8afSAKASHI Takahiro pr_debug("Loaded dtb at 0x%lx bufsz=0x%lx memsz=0x%lx\n", 17451075e0cSŁukasz Stelmach kbuf.mem, kbuf.bufsz, kbuf.memsz); 17552b2a8afSAKASHI Takahiro 17652b2a8afSAKASHI Takahiro return 0; 17752b2a8afSAKASHI Takahiro 17852b2a8afSAKASHI Takahiro out_err: 179108aa503SBenjamin Gwin image->nr_segments = orig_segments; 180*ac10be5cSRob Herring kvfree(dtb); 18152b2a8afSAKASHI Takahiro return ret; 18252b2a8afSAKASHI Takahiro } 183