From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-24.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,NICE_REPLY_A,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1,USER_IN_DEF_DKIM_WL autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 047E7C433FE for ; Mon, 7 Dec 2020 01:51:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id C6CAD22BE8 for ; Mon, 7 Dec 2020 01:51:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728582AbgLGBvY (ORCPT ); Sun, 6 Dec 2020 20:51:24 -0500 Received: from linux.microsoft.com ([13.77.154.182]:49282 "EHLO linux.microsoft.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727040AbgLGBvY (ORCPT ); Sun, 6 Dec 2020 20:51:24 -0500 Received: from [192.168.0.104] (c-73-42-176-67.hsd1.wa.comcast.net [73.42.176.67]) by linux.microsoft.com (Postfix) with ESMTPSA id 73EE020B717A; Sun, 6 Dec 2020 17:50:41 -0800 (PST) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 73EE020B717A DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1607305842; bh=vtq8CyQBySYNuts4DDchsgC3KgHAe6Af4KocNaAPQZw=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=LtRQZg+2FE0F3ZEro0HxgFb8Pb+6iJetwOA0BneYeF5Eoen9J+voUIfOUSV3N1MHj CGHdsDIzs9J6/zsAxGtOeTqBj2S34LHl/L4d3DWv15UwNk35LTXbLoZB8fon4tPM9e 4H/TLv4OSL4EA5GJnMUkrk//mHAUyOxsk3GGXsn4= Subject: Re: [PATCH v10 2/8] powerpc: Move delete_fdt_mem_rsv() to drivers/of/kexec.c To: Thiago Jung Bauermann Cc: zohar@linux.ibm.com, robh@kernel.org, gregkh@linuxfoundation.org, james.morse@arm.com, catalin.marinas@arm.com, sashal@kernel.org, will@kernel.org, mpe@ellerman.id.au, benh@kernel.crashing.org, paulus@samba.org, robh+dt@kernel.org, frowand.list@gmail.com, vincenzo.frascino@arm.com, mark.rutland@arm.com, dmitry.kasatkin@gmail.com, jmorris@namei.org, serge@hallyn.com, pasha.tatashin@soleen.com, allison@lohutok.net, kstewart@linuxfoundation.org, takahiro.akashi@linaro.org, tglx@linutronix.de, masahiroy@kernel.org, bhsharma@redhat.com, mbrugger@suse.com, hsinyi@chromium.org, tao.li@vivo.com, christophe.leroy@c-s.fr, linux-integrity@vger.kernel.org, linux-kernel@vger.kernel.org, devicetree@vger.kernel.org, prsriva@linux.microsoft.com, balajib@linux.microsoft.com References: <20201204195149.611-1-nramas@linux.microsoft.com> <20201204195149.611-3-nramas@linux.microsoft.com> <87ft4louto.fsf@manicouagan.localdomain> From: Lakshmi Ramasubramanian Message-ID: <40f8c03a-f08f-d49e-b404-9a6d79873dd1@linux.microsoft.com> Date: Sun, 6 Dec 2020 17:50:40 -0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.10.0 MIME-Version: 1.0 In-Reply-To: <87ft4louto.fsf@manicouagan.localdomain> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 12/4/20 6:22 PM, Thiago Jung Bauermann wrote: > > Hello Lakshmi, > > Lakshmi Ramasubramanian writes: > >> delete_fdt_mem_rsv() retrieves the memory reserve map entry, for >> the given starting address and size, from the device tree blob, and >> removes the entry from the device tree blob. This function is called >> to free the resources reserved for the buffer used for carrying forward >> the IMA measurement logs on kexec. This function does not have >> architecture specific code, but is currently limited to powerpc. >> >> Move delete_fdt_mem_rsv() to "drivers/of/kexec_fdt.c" so that it is > > s/kexec_fdt.c/kexec.c/ Missed that in the patch description. Will fix it. Thanks. >> accessible for other architectures as well. >> >> Co-developed-by: Prakhar Srivastava >> Signed-off-by: Prakhar Srivastava >> Signed-off-by: Lakshmi Ramasubramanian >> --- >> arch/powerpc/include/asm/kexec.h | 1 - >> arch/powerpc/kexec/file_load.c | 32 ----------------- >> drivers/of/Makefile | 1 + >> drivers/of/kexec.c | 61 ++++++++++++++++++++++++++++++++ >> include/linux/kexec.h | 5 +++ >> 5 files changed, 67 insertions(+), 33 deletions(-) >> create mode 100644 drivers/of/kexec.c >> >> diff --git a/arch/powerpc/include/asm/kexec.h b/arch/powerpc/include/asm/kexec.h >> index 55d6ede30c19..7c223031ecdd 100644 >> --- a/arch/powerpc/include/asm/kexec.h >> +++ b/arch/powerpc/include/asm/kexec.h >> @@ -126,7 +126,6 @@ int setup_purgatory(struct kimage *image, const void *slave_code, >> int setup_new_fdt(const struct kimage *image, void *fdt, >> unsigned long initrd_load_addr, unsigned long initrd_len, >> const char *cmdline); >> -int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size); >> >> #ifdef CONFIG_PPC64 >> struct kexec_buf; >> diff --git a/arch/powerpc/kexec/file_load.c b/arch/powerpc/kexec/file_load.c >> index 9a232bc36c8f..9efc98b1e2ae 100644 >> --- a/arch/powerpc/kexec/file_load.c >> +++ b/arch/powerpc/kexec/file_load.c >> @@ -109,38 +109,6 @@ int setup_purgatory(struct kimage *image, const void *slave_code, >> return 0; >> } >> >> -/** >> - * delete_fdt_mem_rsv - delete memory reservation with given address and size >> - * >> - * Return: 0 on success, or negative errno on error. >> - */ >> -int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size) >> -{ >> - int i, ret, num_rsvs = fdt_num_mem_rsv(fdt); >> - >> - for (i = 0; i < num_rsvs; i++) { >> - uint64_t rsv_start, rsv_size; >> - >> - ret = fdt_get_mem_rsv(fdt, i, &rsv_start, &rsv_size); >> - if (ret) { >> - pr_err("Malformed device tree.\n"); >> - return -EINVAL; >> - } >> - >> - if (rsv_start == start && rsv_size == size) { >> - ret = fdt_del_mem_rsv(fdt, i); >> - if (ret) { >> - pr_err("Error deleting device tree reservation.\n"); >> - return -EINVAL; >> - } >> - >> - return 0; >> - } >> - } >> - >> - return -ENOENT; >> -} >> - >> /* >> * setup_new_fdt - modify /chosen and memory reservation for the next kernel >> * @image: kexec image being loaded. >> diff --git a/drivers/of/Makefile b/drivers/of/Makefile >> index 6e1e5212f058..77d24712c0c8 100644 >> --- a/drivers/of/Makefile >> +++ b/drivers/of/Makefile >> @@ -13,5 +13,6 @@ obj-$(CONFIG_OF_RESERVED_MEM) += of_reserved_mem.o >> obj-$(CONFIG_OF_RESOLVE) += resolver.o >> obj-$(CONFIG_OF_OVERLAY) += overlay.o >> obj-$(CONFIG_OF_NUMA) += of_numa.o >> +obj-$(CONFIG_OF_FLATTREE) += kexec.o > > Isn't this too broad? kexec.o will only be useful to kernel configs > which enable CONFIG_KEXEC_FILE, so perhaps do: > > ifdef CONFIG_OF_FLATTREE > ifdef CONFIG_KEXEC_FILE > obj-y += kexec.o > endif > endif > > What do you think? Per Rob's feedback on v9 patch set, I have moved all the architecture independent ima kexec functions to a single file "drivers/of/kexec.c" Since these functions are enabled on different kernel CONFIGs, I have used IS_ENABLED(CONFIG_XYZ) macro instead of "#ifdef" in the C file to conditionally compile. > >> obj-$(CONFIG_OF_UNITTEST) += unittest-data/ >> diff --git a/drivers/of/kexec.c b/drivers/of/kexec.c >> new file mode 100644 >> index 000000000000..b7d59105fcb8 >> --- /dev/null >> +++ b/drivers/of/kexec.c >> @@ -0,0 +1,61 @@ >> +// SPDX-License-Identifier: GPL-2.0+ >> +/* >> + * Copyright (C) 2020 Microsoft Corporation >> + * >> + * Author: Lakshmi Ramasubramanian (nramas@linux.microsoft.com) >> + * >> + * File: kexec.c >> + * Defines kexec related functions. >> + */ >> + >> +#define pr_fmt(fmt) "OF: kexec: " fmt >> + >> +#include >> +#include >> +#include >> +#include >> +#include >> +#include >> +#include >> + >> +/** >> + * delete_fdt_mem_rsv - delete memory reservation with given address and size >> + * >> + * @fdt: Flattened Device Tree to update >> + * @start: Starting address of the reservation to delete >> + * @size: Size of the reservation to delete >> + * >> + * Return: 0 on success, or negative errno on error. >> + */ >> +int delete_fdt_mem_rsv(void *fdt, unsigned long start, unsigned long size) >> +{ >> + int i, ret, num_rsvs; >> + >> + if (!IS_ENABLED(CONFIG_KEXEC_FILE)) >> + return 0; > > If you agree with my suggestion, then this IS_ENABLED() wouldn't be > needed. > Please see my response above. If there is a way to keep all the ima kexec functions in a single file and yet not use "#ifdef" in C file to conditionally compile, please let me know. I'll update. thanks, -lakshmi >> + >> + num_rsvs = fdt_num_mem_rsv(fdt); >> + for (i = 0; i < num_rsvs; i++) { >> + uint64_t rsv_start, rsv_size; >> + >> + ret = fdt_get_mem_rsv(fdt, i, &rsv_start, &rsv_size); >> + if (ret) { >> + pr_err("Malformed device tree.\n"); >> + return -EINVAL; >> + } >> + >> + if (rsv_start == start && rsv_size == size) { >> + ret = fdt_del_mem_rsv(fdt, i); >> + if (ret) { >> + pr_err("Error deleting device tree reservation.\n"); >> + return -EINVAL; >> + } >> + >> + pr_debug("Freed reserved memory at %lu of size %lu\n", >> + start, size); >> + return 0; >> + } >> + } >> + >> + return -ENOENT; >> +} > > The function code is unchanged apart from the addition of the > IS_ENABLED() and the pr_debug(), so that is good. > >> diff --git a/include/linux/kexec.h b/include/linux/kexec.h >> index 9e93bef52968..d0234c4815da 100644 >> --- a/include/linux/kexec.h >> +++ b/include/linux/kexec.h >> @@ -407,6 +407,11 @@ static inline int kexec_crash_loaded(void) { return 0; } >> #define kexec_in_progress false >> #endif /* CONFIG_KEXEC_CORE */ >> >> +#if defined(CONFIG_OF_FLATTREE) > > This would also change to require CONFIG_KEXEC_FILE. > >> +extern int delete_fdt_mem_rsv(void *fdt, unsigned long start, >> + unsigned long size); >> +#endif /* CONFIG_OF_FLATTREE */ >> + >> #endif /* !defined(__ASSEBMLY__) */ >> >> #endif /* LINUX_KEXEC_H */ > >