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[209.132.180.67]) by mx.google.com with ESMTP id l6si6000209pgn.429.2017.10.23.23.23.12; Mon, 23 Oct 2017 23:23:12 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=eeSwUGau; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751746AbdJXGXK (ORCPT + 27 others); Tue, 24 Oct 2017 02:23:10 -0400 Received: from mail-pg0-f68.google.com ([74.125.83.68]:43744 "EHLO mail-pg0-f68.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932177AbdJXGWL (ORCPT ); Tue, 24 Oct 2017 02:22:11 -0400 Received: by mail-pg0-f68.google.com with SMTP id s75so13711423pgs.0 for ; Mon, 23 Oct 2017 23:22:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=EUDVxNklGgTBLqy4+SSgleaRNqtOZvqCz83pUUNgi98=; b=eeSwUGauJwdlbjZDjI6qvSU7yxdKBQlGVxgvzjoIICts3+wQep+qtDOJOeF7scfPLI 9Q2+At9G1m5s57acBJmtYLs9zJiIB9LMokiV5GL9YvVFYrng5xkUBfa/u0BXEZoj9aWf rZQMhoddx08YGARaZ7aiIxmq8WZwqjwr8IIKo= X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=EUDVxNklGgTBLqy4+SSgleaRNqtOZvqCz83pUUNgi98=; b=lSj3iT60MNCnRzsP4ryOII+LAhPzi7gh1fF9F2saaRX7go0QRW35Elw3rC4qt68eFR Z6M5WByqACNS/D/xoXCB+YQHXDyx+UFwU0k/Z5o5+BG6Q6NhjPRv9reVoH90PsxGKYoM V/+HviWBgXuaz0ojMK2GKKNYhLF0CZgG/RKVQDQDLo/SX1+btTZ8ECPZoq/zcco7pQl4 wU04Ij5qcgKYq5xD56ojJdaC99uV39DRC1BXHw2QQmZBY48dX9gSqBg/kMWRiYvrH2xv s0VF2iPNu8a1f3FThy/Jg+qJbPmu2YPJZ2pAlLgdSHZ6Hx+dNV7CZvbZXKpfpl4EjMFt fCMQ== X-Gm-Message-State: AMCzsaWOFdVMFCQ+egHFuOf3z7EdbSEPO6T47uQJBQ5G+eosPIJA5Na8 v4DelZhidbSssi/622Wf66NWwg== X-Google-Smtp-Source: ABhQp+SWp+tN9NgivVY1+ag3s+q5BGWA6UnGUSCZ3h5d/vLaaW/PtF42ZCFXgCiK8Fy/hwsjmdDdMw== X-Received: by 10.99.154.66 with SMTP id e2mr13818401pgo.116.1508826130923; Mon, 23 Oct 2017 23:22:10 -0700 (PDT) Received: from linaro.org ([121.95.100.191]) by smtp.googlemail.com with ESMTPSA id c9sm16617653pfj.76.2017.10.23.23.22.09 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Mon, 23 Oct 2017 23:22:10 -0700 (PDT) From: AKASHI Takahiro To: catalin.marinas@arm.com, will.deacon@arm.com, bauerman@linux.vnet.ibm.com, dhowells@redhat.com, vgoyal@redhat.com, herbert@gondor.apana.org.au, davem@davemloft.net, akpm@linux-foundation.org, mpe@ellerman.id.au, dyoung@redhat.com, bhe@redhat.com, arnd@arndb.de, ard.biesheuvel@linaro.org, julien.thierry@arm.com Cc: kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, AKASHI Takahiro Subject: [PATCH v6 07/10] arm64: kexec_file: load initrd, device-tree and purgatory segments Date: Tue, 24 Oct 2017 15:23:51 +0900 Message-Id: <20171024062354.22621-8-takahiro.akashi@linaro.org> X-Mailer: git-send-email 2.14.1 In-Reply-To: <20171024062354.22621-1-takahiro.akashi@linaro.org> References: <20171024062354.22621-1-takahiro.akashi@linaro.org> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org load_other_segments() sets up and adds all the memory segments necessary other than kernel, including initrd, device-tree blob and purgatory. Most of the code was borrowed from kexec-tools' counterpart. arch_kimage_kernel_post_load_cleanup() is meant to free arm64-specific data allocated for loading kernel. Signed-off-by: AKASHI Takahiro Cc: Catalin Marinas Cc: Will Deacon --- arch/arm64/include/asm/kexec.h | 22 ++++ arch/arm64/kernel/Makefile | 3 +- arch/arm64/kernel/machine_kexec_file.c | 213 +++++++++++++++++++++++++++++++++ 3 files changed, 237 insertions(+), 1 deletion(-) create mode 100644 arch/arm64/kernel/machine_kexec_file.c -- 2.14.1 diff --git a/arch/arm64/include/asm/kexec.h b/arch/arm64/include/asm/kexec.h index e17f0529a882..2fadd3cbf3af 100644 --- a/arch/arm64/include/asm/kexec.h +++ b/arch/arm64/include/asm/kexec.h @@ -93,6 +93,28 @@ static inline void crash_prepare_suspend(void) {} static inline void crash_post_resume(void) {} #endif +#ifdef CONFIG_KEXEC_FILE +#define ARCH_HAS_KIMAGE_ARCH + +struct kimage_arch { + void *dtb_buf; +}; + +struct kimage; + +#define arch_kimage_file_post_load_cleanup arch_kimage_file_post_load_cleanup +extern int arch_kimage_file_post_load_cleanup(struct kimage *image); + +extern int setup_dtb(struct kimage *image, + unsigned long initrd_load_addr, unsigned long initrd_len, + char *cmdline, unsigned long cmdline_len, + char **dtb_buf, size_t *dtb_buf_len); +extern int load_other_segments(struct kimage *image, + unsigned long kernel_load_addr, + char *initrd, unsigned long initrd_len, + char *cmdline, unsigned long cmdline_len); +#endif + #endif /* __ASSEMBLY__ */ #endif diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile index f2b4e816b6de..5df003d6157c 100644 --- a/arch/arm64/kernel/Makefile +++ b/arch/arm64/kernel/Makefile @@ -48,8 +48,9 @@ arm64-obj-$(CONFIG_ARM64_ACPI_PARKING_PROTOCOL) += acpi_parking_protocol.o arm64-obj-$(CONFIG_PARAVIRT) += paravirt.o arm64-obj-$(CONFIG_RANDOMIZE_BASE) += kaslr.o arm64-obj-$(CONFIG_HIBERNATION) += hibernate.o hibernate-asm.o -arm64-obj-$(CONFIG_KEXEC) += machine_kexec.o relocate_kernel.o \ +arm64-obj-$(CONFIG_KEXEC_CORE) += machine_kexec.o relocate_kernel.o \ cpu-reset.o +arm64-obj-$(CONFIG_KEXEC_FILE) += machine_kexec_file.o arm64-obj-$(CONFIG_ARM64_RELOC_TEST) += arm64-reloc-test.o arm64-reloc-test-y := reloc_test_core.o reloc_test_syms.o arm64-obj-$(CONFIG_CRASH_DUMP) += crash_dump.o diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c new file mode 100644 index 000000000000..81af1602e149 --- /dev/null +++ b/arch/arm64/kernel/machine_kexec_file.c @@ -0,0 +1,213 @@ +/* + * kexec_file for arm64 + * + * Copyright (C) 2017 Linaro Limited + * Author: AKASHI Takahiro + * + * Most code is derived from arm64 port of kexec-tools + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License version 2 as + * published by the Free Software Foundation. + */ + +#define pr_fmt(fmt) "kexec_file: " fmt + +#include +#include +#include +#include +#include +#include + +static int __dt_root_addr_cells; +static int __dt_root_size_cells; + +const struct kexec_file_ops * const kexec_file_loaders[] = { + NULL +}; + +int arch_kimage_file_post_load_cleanup(struct kimage *image) +{ + vfree(image->arch.dtb_buf); + image->arch.dtb_buf = NULL; + + return _kimage_file_post_load_cleanup(image); +} + +int arch_kexec_walk_mem(struct kexec_buf *kbuf, int (*func)(u64, u64, void *)) +{ + if (kbuf->image->type == KEXEC_TYPE_CRASH) + return walk_iomem_res_desc(crashk_res.desc, + IORESOURCE_SYSTEM_RAM | IORESOURCE_BUSY, + crashk_res.start, crashk_res.end, + kbuf, func); + else if (kbuf->top_down) + return walk_system_ram_res_rev(0, ULONG_MAX, kbuf, func); + else + return walk_system_ram_res(0, ULONG_MAX, kbuf, func); +} + +int setup_dtb(struct kimage *image, + unsigned long initrd_load_addr, unsigned long initrd_len, + char *cmdline, unsigned long cmdline_len, + char **dtb_buf, size_t *dtb_buf_len) +{ + char *buf = NULL; + size_t buf_size; + int nodeoffset; + u64 value; + int range_len; + int ret; + + /* duplicate dt blob */ + buf_size = fdt_totalsize(initial_boot_params); + range_len = (__dt_root_addr_cells + __dt_root_size_cells) * sizeof(u32); + + if (initrd_load_addr) + buf_size += fdt_prop_len("initrd-start", sizeof(u64)) + + fdt_prop_len("initrd-end", sizeof(u64)); + + if (cmdline) + buf_size += fdt_prop_len("bootargs", cmdline_len + 1); + + buf = vmalloc(buf_size); + if (!buf) { + ret = -ENOMEM; + goto out_err; + } + + ret = fdt_open_into(initial_boot_params, buf, buf_size); + if (ret) + goto out_err; + + nodeoffset = fdt_path_offset(buf, "/chosen"); + if (nodeoffset < 0) + goto out_err; + + /* add bootargs */ + if (cmdline) { + ret = fdt_setprop(buf, nodeoffset, "bootargs", + cmdline, cmdline_len + 1); + if (ret) + goto out_err; + } + + /* add initrd-* */ + if (initrd_load_addr) { + value = cpu_to_fdt64(initrd_load_addr); + ret = fdt_setprop(buf, nodeoffset, "initrd-start", + &value, sizeof(value)); + if (ret) + goto out_err; + + value = cpu_to_fdt64(initrd_load_addr + initrd_len); + ret = fdt_setprop(buf, nodeoffset, "initrd-end", + &value, sizeof(value)); + if (ret) + goto out_err; + } + + /* trim a buffer */ + fdt_pack(buf); + *dtb_buf = buf; + *dtb_buf_len = fdt_totalsize(buf); + + return 0; + +out_err: + vfree(buf); + return ret; +} + +int load_other_segments(struct kimage *image, unsigned long kernel_load_addr, + char *initrd, unsigned long initrd_len, + char *cmdline, unsigned long cmdline_len) +{ + struct kexec_buf kbuf; + unsigned long initrd_load_addr = 0; + unsigned long purgatory_load_addr, dtb_load_addr; + char *dtb = NULL; + unsigned long dtb_len; + int ret = 0; + + kbuf.image = image; + /* not allocate anything below the kernel */ + kbuf.buf_min = kernel_load_addr; + + /* Load initrd */ + if (initrd) { + kbuf.buffer = initrd; + kbuf.bufsz = initrd_len; + kbuf.memsz = initrd_len; + kbuf.buf_align = PAGE_SIZE; + /* within 1GB-aligned window of up to 32GB in size */ + kbuf.buf_max = round_down(kernel_load_addr, SZ_1G) + + (unsigned long)SZ_1G * 31; + kbuf.top_down = 0; + + ret = kexec_add_buffer(&kbuf); + if (ret) + goto out_err; + initrd_load_addr = kbuf.mem; + + pr_debug("Loaded initrd at 0x%lx bufsz=0x%lx memsz=0x%lx\n", + initrd_load_addr, initrd_len, initrd_len); + } + + /* Load dtb blob */ + ret = setup_dtb(image, initrd_load_addr, initrd_len, + cmdline, cmdline_len, &dtb, &dtb_len); + if (ret) { + pr_err("Preparing for new dtb failed\n"); + goto out_err; + } + + kbuf.buffer = dtb; + kbuf.bufsz = dtb_len; + kbuf.memsz = dtb_len; + /* not across 2MB boundary */ + kbuf.buf_align = SZ_2M; + kbuf.buf_max = ULONG_MAX; + kbuf.top_down = 1; + + ret = kexec_add_buffer(&kbuf); + if (ret) + goto out_err; + dtb_load_addr = kbuf.mem; + image->arch.dtb_buf = dtb; + + pr_debug("Loaded dtb at 0x%lx bufsz=0x%lx memsz=0x%lx\n", + dtb_load_addr, dtb_len, dtb_len); + + /* Load purgatory */ + ret = kexec_load_purgatory(image, kernel_load_addr, ULONG_MAX, 1, + &purgatory_load_addr); + if (ret) { + pr_err("Loading purgatory failed\n"); + goto out_err; + } + + ret = kexec_purgatory_get_set_symbol(image, "kernel_entry", + &kernel_load_addr, sizeof(kernel_load_addr), 0); + if (ret) { + pr_err("Setting symbol (kernel_entry) failed.\n"); + goto out_err; + } + + ret = kexec_purgatory_get_set_symbol(image, "dtb_addr", + &dtb_load_addr, sizeof(dtb_load_addr), 0); + if (ret) { + pr_err("Setting symbol (dtb_addr) failed.\n"); + goto out_err; + } + + pr_debug("Loaded purgatory at 0x%lx\n", purgatory_load_addr); + + return 0; + +out_err: + vfree(dtb); + image->arch.dtb_buf = NULL; + return ret; +}