From patchwork Sat Feb 13 16:10:43 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Lakshmi Ramasubramanian X-Patchwork-Id: 1440224 Return-Path: X-Original-To: patchwork-incoming@ozlabs.org Delivered-To: patchwork-incoming@ozlabs.org Received: from lists.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (4096 bits)) (No client certificate requested) by ozlabs.org (Postfix) with ESMTPS id 4DdFyL2BYfz9rx8 for ; Sun, 14 Feb 2021 03:22:34 +1100 (AEDT) Authentication-Results: ozlabs.org; dkim=fail reason="signature verification failed" (1024-bit key; unprotected) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.a=rsa-sha256 header.s=default header.b=Lt4b0cgf; dkim-atps=neutral Received: from bilbo.ozlabs.org (lists.ozlabs.org [IPv6:2401:3900:2:1::3]) by lists.ozlabs.org (Postfix) with ESMTP id 4DdFyL1NzSzDxWk for ; Sun, 14 Feb 2021 03:22:34 +1100 (AEDT) X-Original-To: linuxppc-dev@lists.ozlabs.org Delivered-To: linuxppc-dev@lists.ozlabs.org Authentication-Results: lists.ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=linux.microsoft.com (client-ip=13.77.154.182; helo=linux.microsoft.com; envelope-from=nramas@linux.microsoft.com; receiver=) Authentication-Results: lists.ozlabs.org; dkim=pass (1024-bit key; unprotected) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.a=rsa-sha256 header.s=default header.b=Lt4b0cgf; dkim-atps=neutral Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by lists.ozlabs.org (Postfix) with ESMTP id 4DdFj01BCTzDqBr for ; Sun, 14 Feb 2021 03:11:00 +1100 (AEDT) Received: from localhost.localdomain (c-73-42-176-67.hsd1.wa.comcast.net [73.42.176.67]) by linux.microsoft.com (Postfix) with ESMTPSA id DD88920B57A6; Sat, 13 Feb 2021 08:10:57 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com DD88920B57A6 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1613232658; bh=+ekBh8PFmZx2WTPRqFx8ENqa+iyEYnl2iF37cIuTI5o=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Lt4b0cgf83fmtw4RSmuyOcgDMcBBTDZeYUc2j9FyqiRmOz+U48KRaDQhDqr9xIPpg W6koEtIFBRGi3BCbFDoUa9HOjAtNd7/BFVOcwfmRA4D0bOu8v3YYqLGp+7/Ih2+n/7 gTOdQOpL+BG7mJYTJkbLImGo301S0TybwsHIZ+L4= From: Lakshmi Ramasubramanian To: zohar@linux.ibm.com, bauerman@linux.ibm.com, robh@kernel.org, takahiro.akashi@linaro.org, gregkh@linuxfoundation.org, will@kernel.org, joe@perches.com, catalin.marinas@arm.com, mpe@ellerman.id.au Subject: [PATCH v18 05/11] powerpc: Use common of_kexec_alloc_and_setup_fdt() Date: Sat, 13 Feb 2021 08:10:43 -0800 Message-Id: <20210213161049.6190-6-nramas@linux.microsoft.com> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210213161049.6190-1-nramas@linux.microsoft.com> References: <20210213161049.6190-1-nramas@linux.microsoft.com> MIME-Version: 1.0 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: mark.rutland@arm.com, tao.li@vivo.com, paulus@samba.org, vincenzo.frascino@arm.com, frowand.list@gmail.com, sashal@kernel.org, masahiroy@kernel.org, jmorris@namei.org, allison@lohutok.net, serge@hallyn.com, devicetree@vger.kernel.org, pasha.tatashin@soleen.com, prsriva@linux.microsoft.com, hsinyi@chromium.org, linux-arm-kernel@lists.infradead.org, christophe.leroy@c-s.fr, mbrugger@suse.com, balajib@linux.microsoft.com, dmitry.kasatkin@gmail.com, linux-kernel@vger.kernel.org, james.morse@arm.com, linux-integrity@vger.kernel.org, linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+patchwork-incoming=ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" From: Rob Herring The code for setting up the /chosen node in the device tree and updating the memory reservation for the next kernel has been moved to of_kexec_alloc_and_setup_fdt() defined in "drivers/of/kexec.c". Use the common of_kexec_alloc_and_setup_fdt() to setup the device tree and update the memory reservation for kexec for powerpc. Signed-off-by: Rob Herring Signed-off-by: Lakshmi Ramasubramanian Reviewed-by: Thiago Jung Bauermann --- arch/powerpc/include/asm/kexec.h | 1 + arch/powerpc/kexec/elf_64.c | 30 ++++--- arch/powerpc/kexec/file_load.c | 132 +----------------------------- arch/powerpc/kexec/file_load_64.c | 3 + 4 files changed, 26 insertions(+), 140 deletions(-) diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h index 4d9b250cf1e6..f59946c6f9e6 100644 --- a/arch/powerpc/include/asm/kexec.h +++ b/arch/powerpc/include/asm/kexec.h @@ -111,6 +111,7 @@ struct kimage_arch { unsigned long elf_load_addr; unsigned long elf_headers_sz; void *elf_headers; + void *fdt; #ifdef CONFIG_IMA_KEXEC phys_addr_t ima_buffer_addr; diff --git a/arch/powerpc/kexec/elf_64.c b/arch/powerpc/kexec/elf_64.c index d0e459bb2f05..87e34611f93d 100644 --- a/arch/powerpc/kexec/elf_64.c +++ b/arch/powerpc/kexec/elf_64.c @@ -19,6 +19,7 @@ #include #include #include +#include #include #include #include @@ -29,7 +30,6 @@ static void *elf64_load(struct kimage *image, char *kernel_buf, unsigned long cmdline_len) { int ret; - unsigned int fdt_size; unsigned long kernel_load_addr; unsigned long initrd_load_addr = 0, fdt_load_addr; void *fdt; @@ -102,15 +102,10 @@ static void *elf64_load(struct kimage *image, char *kernel_buf, pr_debug("Loaded initrd at 0x%lx\n", initrd_load_addr); } - fdt_size = fdt_totalsize(initial_boot_params) * 2; - fdt = kmalloc(fdt_size, GFP_KERNEL); + fdt = of_kexec_alloc_and_setup_fdt(image, initrd_load_addr, + initrd_len, cmdline, + fdt_totalsize(initial_boot_params)); if (!fdt) { - pr_err("Not enough memory for the device tree.\n"); - ret = -ENOMEM; - goto out; - } - ret = fdt_open_into(initial_boot_params, fdt, fdt_size); - if (ret < 0) { pr_err("Error setting up the new device tree.\n"); ret = -EINVAL; goto out; @@ -124,13 +119,17 @@ static void *elf64_load(struct kimage *image, char *kernel_buf, fdt_pack(fdt); kbuf.buffer = fdt; - kbuf.bufsz = kbuf.memsz = fdt_size; + kbuf.bufsz = kbuf.memsz = fdt_totalsize(fdt); kbuf.buf_align = PAGE_SIZE; kbuf.top_down = true; kbuf.mem = KEXEC_BUF_MEM_UNKNOWN; ret = kexec_add_buffer(&kbuf); if (ret) goto out; + + /* FDT will be freed in arch_kimage_file_post_load_cleanup */ + image->arch.fdt = fdt; + fdt_load_addr = kbuf.mem; pr_debug("Loaded device tree at 0x%lx\n", fdt_load_addr); @@ -145,8 +144,15 @@ static void *elf64_load(struct kimage *image, char *kernel_buf, kfree(modified_cmdline); kexec_free_elf_info(&elf_info); - /* Make kimage_file_post_load_cleanup free the fdt buffer for us. */ - return ret ? ERR_PTR(ret) : fdt; + /* + * Once FDT buffer has been successfully passed to kexec_add_buffer(), + * the FDT buffer address is saved in image->arch.fdt. In that case, + * the memory cannot be freed here in case of any other error. + */ + if (ret && !image->arch.fdt) + kvfree(fdt); + + return ret ? ERR_PTR(ret) : NULL; } const struct kexec_file_ops kexec_elf64_ops = { diff --git a/arch/powerpc/kexec/file_load.c b/arch/powerpc/kexec/file_load.c index f7c31daf8a2e..af5a4724a70e 100644 --- a/arch/powerpc/kexec/file_load.c +++ b/arch/powerpc/kexec/file_load.c @@ -156,135 +156,11 @@ int setup_new_fdt(const struct kimage *image, void *fdt, unsigned long initrd_load_addr, unsigned long initrd_len, const char *cmdline) { - int ret, chosen_node; - const void *prop; - - /* Remove memory reservation for the current device tree. */ - ret = delete_fdt_mem_rsv(fdt, __pa(initial_boot_params), - fdt_totalsize(initial_boot_params)); - if (ret == 0) - pr_debug("Removed old device tree reservation.\n"); - else if (ret != -ENOENT) - return ret; - - chosen_node = fdt_path_offset(fdt, "/chosen"); - if (chosen_node == -FDT_ERR_NOTFOUND) { - chosen_node = fdt_add_subnode(fdt, fdt_path_offset(fdt, "/"), - "chosen"); - if (chosen_node < 0) { - pr_err("Error creating /chosen.\n"); - return -EINVAL; - } - } else if (chosen_node < 0) { - pr_err("Malformed device tree: error reading /chosen.\n"); - return -EINVAL; - } - - /* Did we boot using an initrd? */ - prop = fdt_getprop(fdt, chosen_node, "linux,initrd-start", NULL); - if (prop) { - uint64_t tmp_start, tmp_end, tmp_size; - - tmp_start = fdt64_to_cpu(*((const fdt64_t *) prop)); - - prop = fdt_getprop(fdt, chosen_node, "linux,initrd-end", NULL); - if (!prop) { - pr_err("Malformed device tree.\n"); - return -EINVAL; - } - tmp_end = fdt64_to_cpu(*((const fdt64_t *) prop)); - - /* - * kexec reserves exact initrd size, while firmware may - * reserve a multiple of PAGE_SIZE, so check for both. - */ - tmp_size = tmp_end - tmp_start; - ret = delete_fdt_mem_rsv(fdt, tmp_start, tmp_size); - if (ret == -ENOENT) - ret = delete_fdt_mem_rsv(fdt, tmp_start, - round_up(tmp_size, PAGE_SIZE)); - if (ret == 0) - pr_debug("Removed old initrd reservation.\n"); - else if (ret != -ENOENT) - return ret; - - /* If there's no new initrd, delete the old initrd's info. */ - if (initrd_len == 0) { - ret = fdt_delprop(fdt, chosen_node, - "linux,initrd-start"); - if (ret) { - pr_err("Error deleting linux,initrd-start.\n"); - return -EINVAL; - } - - ret = fdt_delprop(fdt, chosen_node, "linux,initrd-end"); - if (ret) { - pr_err("Error deleting linux,initrd-end.\n"); - return -EINVAL; - } - } - } - - if (initrd_len) { - ret = fdt_setprop_u64(fdt, chosen_node, - "linux,initrd-start", - initrd_load_addr); - if (ret < 0) - goto err; - - /* initrd-end is the first address after the initrd image. */ - ret = fdt_setprop_u64(fdt, chosen_node, "linux,initrd-end", - initrd_load_addr + initrd_len); - if (ret < 0) - goto err; - - ret = fdt_add_mem_rsv(fdt, initrd_load_addr, initrd_len); - if (ret) { - pr_err("Error reserving initrd memory: %s\n", - fdt_strerror(ret)); - return -EINVAL; - } - } - - if (cmdline != NULL) { - ret = fdt_setprop_string(fdt, chosen_node, "bootargs", cmdline); - if (ret < 0) - goto err; - } else { - ret = fdt_delprop(fdt, chosen_node, "bootargs"); - if (ret && ret != -FDT_ERR_NOTFOUND) { - pr_err("Error deleting bootargs.\n"); - return -EINVAL; - } - } - - if (image->type == KEXEC_TYPE_CRASH) { - /* - * Avoid elfcorehdr from being stomped on in kdump kernel by - * setting up memory reserve map. - */ - ret = fdt_add_mem_rsv(fdt, image->arch.elf_load_addr, - image->arch.elf_headers_sz); - if (ret) { - pr_err("Error reserving elfcorehdr memory: %s\n", - fdt_strerror(ret)); - goto err; - } - } - - ret = setup_ima_buffer(image, fdt, chosen_node); - if (ret) { - pr_err("Error setting up the new device tree.\n"); - return ret; - } + int ret; - ret = fdt_setprop(fdt, chosen_node, "linux,booted-from-kexec", NULL, 0); + ret = setup_ima_buffer(image, fdt, fdt_path_offset(fdt, "/chosen")); if (ret) - goto err; - - return 0; + pr_err("Error setting up the new device tree.\n"); -err: - pr_err("Error setting up the new device tree.\n"); - return -EINVAL; + return ret; } diff --git a/arch/powerpc/kexec/file_load_64.c b/arch/powerpc/kexec/file_load_64.c index e539b7d401a2..0463ed8ff9ea 100644 --- a/arch/powerpc/kexec/file_load_64.c +++ b/arch/powerpc/kexec/file_load_64.c @@ -1111,5 +1111,8 @@ int arch_kimage_file_post_load_cleanup(struct kimage *image) image->arch.elf_headers = NULL; image->arch.elf_headers_sz = 0; + kvfree(image->arch.fdt); + image->arch.fdt = NULL; + return kexec_image_post_load_cleanup_default(image); }