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[209.132.180.67]) by mx.google.com with ESMTP id t23-v6si8069218pgk.26.2018.09.07.01.00.56; Fri, 07 Sep 2018 01:00:56 -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=MZ9A3QxJ; 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 S1728132AbeIGMki (ORCPT + 32 others); Fri, 7 Sep 2018 08:40:38 -0400 Received: from mail-pl1-f195.google.com ([209.85.214.195]:38602 "EHLO mail-pl1-f195.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726596AbeIGMki (ORCPT ); Fri, 7 Sep 2018 08:40:38 -0400 Received: by mail-pl1-f195.google.com with SMTP id u11-v6so6231252plq.5 for ; Fri, 07 Sep 2018 01:00:54 -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=kuvWS+UEUvQZ2xoTaqUxXfZ4y4Bfqw3nkDkVU5NcSio=; b=MZ9A3QxJ7yRFgCIEoDFMglvR9MFB25h+UXHZBcN7/UOYpmmUXgi1mSCgTP+t/wweU0 zwdH74SMalwuKNMY0AKwCfQ5f1pJS+9JZj7BJZoARJLLUyk5aTxJjMD6xisomeA4BNng aKJBLMbfPRiLXNAnDCTTDLTUryjVXLq/w4MEI= 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=kuvWS+UEUvQZ2xoTaqUxXfZ4y4Bfqw3nkDkVU5NcSio=; b=aanWjAZ4+n5ik5EJ3RduIz5j7kAES6xHDElXHexhqIA6Is+R+03C9ju4nuSbfe+FcN Gwjdhaejg+nHZZAr9R0mXt3v9CrMlH+OdChaTmN36nQhhD23eKABi2XfYqR2u5PLJs0M DGWv31jaIfqO8780UHvDQ7VXZmJCNo5YPLDnFNqPvAe1DN4wo985PddXczVemW4ak/LC QcZ3qWkLcyqrcWZr14IcICf+DB2Am6suBdf4KALhrRG7hIgW9+ZuBag0/CP3R3PBgNwe EA5nCI2Hb8ZDmP4/5EkAfNg88vJN+129Jc504SpghqcW6chRsfv3G9vfVHcip4ZXg6wV LlGQ== X-Gm-Message-State: APzg51DMZsIimBLmawZrz0Yi0mdLXRKyVQORx8NhR5IOySZDXE1CeD0s 4axOS3yjDuT76A3bKuSOU8imyw== X-Received: by 2002:a17:902:3c5:: with SMTP id d63-v6mr6654075pld.145.1536307253444; Fri, 07 Sep 2018 01:00:53 -0700 (PDT) Received: from linaro.org ([121.95.100.191]) by smtp.googlemail.com with ESMTPSA id d12-v6sm10819689pfk.69.2018.09.07.01.00.52 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 07 Sep 2018 01:00:52 -0700 (PDT) From: AKASHI Takahiro To: catalin.marinas@arm.com, will.deacon@arm.com, dhowells@redhat.com, vgoyal@redhat.com, herbert@gondor.apana.org.au, davem@davemloft.net, dyoung@redhat.com, bhe@redhat.com, arnd@arndb.de, schwidefsky@de.ibm.com, heiko.carstens@de.ibm.com Cc: prudo@linux.ibm.com, ard.biesheuvel@linaro.org, james.morse@arm.com, bhsharma@redhat.com, kexec@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, AKASHI Takahiro Subject: [PATCH v14 10/16] arm64: kexec_file: load initrd and device-tree Date: Fri, 7 Sep 2018 17:00:34 +0900 Message-Id: <20180907080040.4967-5-takahiro.akashi@linaro.org> X-Mailer: git-send-email 2.18.0 In-Reply-To: <20180907080040.4967-1-takahiro.akashi@linaro.org> References: <20180907080040.4967-1-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() is expected to allocate and place all the necessary memory segments other than kernel, including initrd and device-tree blob (and elf core header for crash). While most of the code was borrowed from kexec-tools' counterpart, users may not be allowed to specify dtb explicitly, instead, the dtb presented by the original boot loader is reused. arch_kimage_kernel_post_load_cleanup() is responsible for freeing arm64- specific data allocated in load_other_segments(). Signed-off-by: AKASHI Takahiro Cc: Catalin Marinas Cc: Will Deacon Reviewed-by: James Morse --- arch/arm64/include/asm/kexec.h | 17 +++ arch/arm64/kernel/machine_kexec_file.c | 188 +++++++++++++++++++++++++ 2 files changed, 205 insertions(+) -- 2.18.0 diff --git a/arch/arm64/include/asm/kexec.h b/arch/arm64/include/asm/kexec.h index e17f0529a882..157b2897d911 100644 --- a/arch/arm64/include/asm/kexec.h +++ b/arch/arm64/include/asm/kexec.h @@ -93,6 +93,23 @@ 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; + unsigned long dtb_mem; +}; + +struct kimage; + +extern int arch_kimage_file_post_load_cleanup(struct kimage *image); +extern int load_other_segments(struct kimage *image, + unsigned long kernel_load_addr, unsigned long kernel_size, + char *initrd, unsigned long initrd_len, + char *cmdline, unsigned long cmdline_len); +#endif + #endif /* __ASSEMBLY__ */ #endif diff --git a/arch/arm64/kernel/machine_kexec_file.c b/arch/arm64/kernel/machine_kexec_file.c index c38a8048ed00..f53f14bd1700 100644 --- a/arch/arm64/kernel/machine_kexec_file.c +++ b/arch/arm64/kernel/machine_kexec_file.c @@ -5,12 +5,200 @@ * Copyright (C) 2018 Linaro Limited * Author: AKASHI Takahiro * + * Most code is derived from arm64 port of kexec-tools */ #define pr_fmt(fmt) "kexec_file: " fmt +#include +#include #include +#include +#include +#include +#include +#include + +/* relevant device tree properties */ +#define FDT_PSTR_INITRD_STA "linux,initrd-start" +#define FDT_PSTR_INITRD_END "linux,initrd-end" +#define FDT_PSTR_BOOTARGS "bootargs" const struct kexec_file_ops * const kexec_file_loaders[] = { NULL }; + +int arch_kimage_file_post_load_cleanup(struct kimage *image) +{ + vfree(image->arch.dtb); + image->arch.dtb = NULL; + + return kexec_image_post_load_cleanup_default(image); +} + +static int setup_dtb(struct kimage *image, + unsigned long initrd_load_addr, unsigned long initrd_len, + char *cmdline, unsigned long cmdline_len, + void **dtb_buf, unsigned long *dtb_buf_len) +{ + void *buf = NULL; + size_t buf_size; + int nodeoffset; + int ret; + + /* duplicate dt blob */ + buf_size = fdt_totalsize(initial_boot_params); + + if (initrd_load_addr) { + /* can be redundant, but trimmed at the end */ + buf_size += fdt_prop_len(FDT_PSTR_INITRD_STA, sizeof(u64)); + buf_size += fdt_prop_len(FDT_PSTR_INITRD_END, sizeof(u64)); + } + + if (cmdline) + /* can be redundant, but trimmed at the end */ + buf_size += fdt_prop_len(FDT_PSTR_BOOTARGS, cmdline_len); + + buf = vmalloc(buf_size); + if (!buf) { + ret = -ENOMEM; + goto out_err; + } + + ret = fdt_open_into(initial_boot_params, buf, buf_size); + if (ret) { + ret = -EINVAL; + goto out_err; + } + + nodeoffset = fdt_path_offset(buf, "/chosen"); + if (nodeoffset < 0) { + ret = -EINVAL; + goto out_err; + } + + /* add bootargs */ + if (cmdline) { + ret = fdt_setprop_string(buf, nodeoffset, FDT_PSTR_BOOTARGS, + cmdline); + if (ret) { + ret = -EINVAL; + goto out_err; + } + } else { + ret = fdt_delprop(buf, nodeoffset, FDT_PSTR_BOOTARGS); + if (ret && (ret != -FDT_ERR_NOTFOUND)) { + ret = -EINVAL; + goto out_err; + } + } + + /* add initrd-* */ + if (initrd_load_addr) { + ret = fdt_setprop_u64(buf, nodeoffset, FDT_PSTR_INITRD_STA, + initrd_load_addr); + if (ret) { + ret = -EINVAL; + goto out_err; + } + + ret = fdt_setprop_u64(buf, nodeoffset, FDT_PSTR_INITRD_END, + initrd_load_addr + initrd_len); + if (ret) { + ret = -EINVAL; + goto out_err; + } + } else { + ret = fdt_delprop(buf, nodeoffset, FDT_PSTR_INITRD_STA); + if (ret && (ret != -FDT_ERR_NOTFOUND)) { + ret = -EINVAL; + goto out_err; + } + + ret = fdt_delprop(buf, nodeoffset, FDT_PSTR_INITRD_END); + if (ret && (ret != -FDT_ERR_NOTFOUND)) { + ret = -EINVAL; + 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, + unsigned long kernel_size, + char *initrd, unsigned long initrd_len, + char *cmdline, unsigned long cmdline_len) +{ + struct kexec_buf kbuf; + void *dtb = NULL; + unsigned long initrd_load_addr = 0, dtb_len; + int ret = 0; + + kbuf.image = image; + /* not allocate anything below the kernel */ + kbuf.buf_min = kernel_load_addr + kernel_size; + + /* load initrd */ + if (initrd) { + kbuf.buffer = initrd; + kbuf.bufsz = initrd_len; + kbuf.mem = 0; + kbuf.memsz = initrd_len; + kbuf.buf_align = 0; + /* within 1GB-aligned window of up to 32GB in size */ + kbuf.buf_max = round_down(kernel_load_addr, SZ_1G) + + (unsigned long)SZ_1G * 32; + kbuf.top_down = false; + + 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.mem = 0; + kbuf.memsz = dtb_len; + /* not across 2MB boundary */ + kbuf.buf_align = SZ_2M; + kbuf.buf_max = ULONG_MAX; + kbuf.top_down = true; + + ret = kexec_add_buffer(&kbuf); + if (ret) + goto out_err; + image->arch.dtb = dtb; + image->arch.dtb_mem = kbuf.mem; + + pr_debug("Loaded dtb at 0x%lx bufsz=0x%lx memsz=0x%lx\n", + kbuf.mem, dtb_len, dtb_len); + + return 0; + +out_err: + vfree(dtb); + return ret; +}