From patchwork Thu Nov 15 05:52:43 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: AKASHI Takahiro X-Patchwork-Id: 10683535 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id B5AF714DB for ; Thu, 15 Nov 2018 05:54:10 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id A0AF52C140 for ; Thu, 15 Nov 2018 05:54:10 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 94FDC2C15A; Thu, 15 Nov 2018 05:54:10 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-3.6 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_LOW autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id CAF922C140 for ; Thu, 15 Nov 2018 05:54:09 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:Cc:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=JpYj+5GjQULy+nrLdmaq9DtVwo2zErAfZIJlSmdkSZE=; b=bn1RRd4NoMPkTV cO3+PmXi1ml+ZbBZXNOkAX1aEhEsqPvqwoskzWW+h3R4+7A9K4bxhPTPynf14viExo2ufSsY3k8Vy YVOqIpJaAxew0QJ//NgXOWc3lrvuIhPrNbZsw1rRCGkmpO+e4Nc6OEh331IlDLP8fyQLlcWv/ebUj C0WDLFVbgAAWU2TxllEdWuN/ydjo0StmfRU29BUWL7RF778CcpMOZDZw8dktgMiuiSNz/xCyqd+NI OCVVWSXY4P3kSHGyT1IzrCknpyJvxNrjTiUP06/FmwJZKtbDaraVSdSy0KoguUpMYKXT0ywOQMJR2 WXj2uBjJy+D+j9PPQBkQ==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gNAbP-0006uo-KM; Thu, 15 Nov 2018 05:54:07 +0000 Received: from mail-yb1-xb44.google.com ([2607:f8b0:4864:20::b44]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gNAa2-0005RF-AT for linux-arm-kernel@lists.infradead.org; Thu, 15 Nov 2018 05:52:45 +0000 Received: by mail-yb1-xb44.google.com with SMTP id i17-v6so7888978ybp.13 for ; Wed, 14 Nov 2018 21:52:31 -0800 (PST) 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 :mime-version:content-transfer-encoding; bh=vuW0vIeG+fBL43JD346Yj35MDPMUrs8BFpP/g2qIAkI=; b=fmHs7jD24UHXdOuV/RkXNE33quq7FklmXfYHhzdXD54yuqcW05dBiwZbw9bjD6QJi1 04In6CXtz+DS4CTg8ukwS6Y2JN/kyYfarrl7ZKGCclurAduh8t7ooBJ2qMqIrWNyE7wp C9mfdCln8YmApMBPPd6S/bh0RyRPFLGUtIXWk= 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:mime-version:content-transfer-encoding; bh=vuW0vIeG+fBL43JD346Yj35MDPMUrs8BFpP/g2qIAkI=; b=oq8qqRimrzPP2enbgWmWdS7zTAr22mjfmo6LMFyCkO2bSDQwDz9ht845OfMgDfHyyr qgOPKywKizYQqNdNWzjPIujzrfQVscNJsg4aqlGBCNkMl0Wt3Y+Xj/Yeaf57tRaNe7GH NSj9fbCh+bx0cDxIcNM88UP5wj848ZUaXQgfHoSiqyeA741tsqrAXICfgW5ilEMboJA8 tjUT9LpMyXu/l5u8rnYQjzPslRk/y4eMg0U2kfizg4X1FJOtUIPQnj6L/JzPFU6SPhhZ khowzj68/86SgbCcf4Ul4bNt6rpWT4f377L/z80TKKB0kyYRi6tqvZx2Ci/W1XQenlZs pH4Q== X-Gm-Message-State: AGRZ1gK4BPU9N3FksY9BE8fMNMCAotAVwwS9y4WoI1r2Vb+0ZhcjWhBH zyumaHfLasCh8OoG8d/ofilMRg== X-Google-Smtp-Source: AJdET5cSKJSln6HGf2ZJpmsq8nkU9sQMtJCL2cEfX/SXq35ZLGNxWkhAiW8/FTpQTLfMVo/f26hT/g== X-Received: by 2002:a25:b213:: with SMTP id i19-v6mr4461442ybj.414.1542261150950; Wed, 14 Nov 2018 21:52:30 -0800 (PST) Received: from linaro.org ([121.95.100.191]) by smtp.googlemail.com with ESMTPSA id w70sm603729yww.76.2018.11.14.21.52.30 (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Wed, 14 Nov 2018 21:52:30 -0800 (PST) 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 Subject: [PATCH v16 04/16] powerpc, kexec_file: factor out memblock-based arch_kexec_walk_mem() Date: Thu, 15 Nov 2018 14:52:43 +0900 Message-Id: <20181115055254.2812-5-takahiro.akashi@linaro.org> X-Mailer: git-send-email 2.19.0 In-Reply-To: <20181115055254.2812-1-takahiro.akashi@linaro.org> References: <20181115055254.2812-1-takahiro.akashi@linaro.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20181114_215242_555520_72D01F7F X-CRM114-Status: GOOD ( 19.01 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: ard.biesheuvel@linaro.org, bhsharma@redhat.com, kexec@lists.infradead.org, linux-kernel@vger.kernel.org, prudo@linux.ibm.com, AKASHI Takahiro , james.morse@arm.com, "Eric W. Biederman" , linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP Memblock list is another source for usable system memory layout. So move powerpc's arch_kexec_walk_mem() to common code so that other memblock-based architectures, particularly arm64, can also utilise it. A moved function is now renamed to kexec_walk_memblock() and integrated into kexec_locate_mem_hole(), which will now be usable for all architectures with no need for overriding arch_kexec_walk_mem(). With this change, arch_kexec_walk_mem() need no longer be a weak function, and was now renamed to kexec_walk_resources(). Since powerpc doesn't support kdump in its kexec_file_load(), the current kexec_walk_memblock() won't work for kdump either in this form, this will be fixed in the next patch. Signed-off-by: AKASHI Takahiro Cc: "Eric W. Biederman" Acked-by: Dave Young Cc: Vivek Goyal Cc: Baoquan He Acked-by: James Morse --- arch/powerpc/kernel/machine_kexec_file_64.c | 54 ------------------ include/linux/kexec.h | 2 - kernel/kexec_file.c | 61 +++++++++++++++++++-- 3 files changed, 57 insertions(+), 60 deletions(-) diff --git a/arch/powerpc/kernel/machine_kexec_file_64.c b/arch/powerpc/kernel/machine_kexec_file_64.c index c77e95e9b384..0d20c7ad40fa 100644 --- a/arch/powerpc/kernel/machine_kexec_file_64.c +++ b/arch/powerpc/kernel/machine_kexec_file_64.c @@ -24,7 +24,6 @@ #include #include -#include #include #include #include @@ -46,59 +45,6 @@ int arch_kexec_kernel_image_probe(struct kimage *image, void *buf, return kexec_image_probe_default(image, buf, buf_len); } -/** - * arch_kexec_walk_mem - call func(data) for each unreserved memory block - * @kbuf: Context info for the search. Also passed to @func. - * @func: Function to call for each memory block. - * - * This function is used by kexec_add_buffer and kexec_locate_mem_hole - * to find unreserved memory to load kexec segments into. - * - * Return: The memory walk will stop when func returns a non-zero value - * and that value will be returned. If all free regions are visited without - * func returning non-zero, then zero will be returned. - */ -int arch_kexec_walk_mem(struct kexec_buf *kbuf, - int (*func)(struct resource *, void *)) -{ - int ret = 0; - u64 i; - phys_addr_t mstart, mend; - struct resource res = { }; - - if (kbuf->top_down) { - for_each_free_mem_range_reverse(i, NUMA_NO_NODE, 0, - &mstart, &mend, NULL) { - /* - * In memblock, end points to the first byte after the - * range while in kexec, end points to the last byte - * in the range. - */ - res.start = mstart; - res.end = mend - 1; - ret = func(&res, kbuf); - if (ret) - break; - } - } else { - for_each_free_mem_range(i, NUMA_NO_NODE, 0, &mstart, &mend, - NULL) { - /* - * In memblock, end points to the first byte after the - * range while in kexec, end points to the last byte - * in the range. - */ - res.start = mstart; - res.end = mend - 1; - ret = func(&res, kbuf); - if (ret) - break; - } - } - - return ret; -} - /** * setup_purgatory - initialize the purgatory's global variables * @image: kexec image. diff --git a/include/linux/kexec.h b/include/linux/kexec.h index f378cb786f1b..d58d1f2fab10 100644 --- a/include/linux/kexec.h +++ b/include/linux/kexec.h @@ -192,8 +192,6 @@ int __weak arch_kexec_apply_relocations(struct purgatory_info *pi, const Elf_Shdr *relsec, const Elf_Shdr *symtab); -int __weak arch_kexec_walk_mem(struct kexec_buf *kbuf, - int (*func)(struct resource *, void *)); extern int kexec_add_buffer(struct kexec_buf *kbuf); int kexec_locate_mem_hole(struct kexec_buf *kbuf); diff --git a/kernel/kexec_file.c b/kernel/kexec_file.c index 9e6529da12ed..d03195a8cb6e 100644 --- a/kernel/kexec_file.c +++ b/kernel/kexec_file.c @@ -16,6 +16,7 @@ #include #include #include +#include #include #include #include @@ -499,8 +500,57 @@ static int locate_mem_hole_callback(struct resource *res, void *arg) return locate_mem_hole_bottom_up(start, end, kbuf); } +#ifdef CONFIG_ARCH_DISCARD_MEMBLOCK +static int kexec_walk_memblock(struct kexec_buf *kbuf, + int (*func)(struct resource *, void *)) +{ + return 0; +} +#else +static int kexec_walk_memblock(struct kexec_buf *kbuf, + int (*func)(struct resource *, void *)) +{ + int ret = 0; + u64 i; + phys_addr_t mstart, mend; + struct resource res = { }; + + if (kbuf->top_down) { + for_each_free_mem_range_reverse(i, NUMA_NO_NODE, 0, + &mstart, &mend, NULL) { + /* + * In memblock, end points to the first byte after the + * range while in kexec, end points to the last byte + * in the range. + */ + res.start = mstart; + res.end = mend - 1; + ret = func(&res, kbuf); + if (ret) + break; + } + } else { + for_each_free_mem_range(i, NUMA_NO_NODE, 0, &mstart, &mend, + NULL) { + /* + * In memblock, end points to the first byte after the + * range while in kexec, end points to the last byte + * in the range. + */ + res.start = mstart; + res.end = mend - 1; + ret = func(&res, kbuf); + if (ret) + break; + } + } + + return ret; +} +#endif + /** - * arch_kexec_walk_mem - call func(data) on free memory regions + * kexec_walk_resources - call func(data) on free memory regions * @kbuf: Context info for the search. Also passed to @func. * @func: Function to call for each memory region. * @@ -508,8 +558,8 @@ static int locate_mem_hole_callback(struct resource *res, void *arg) * and that value will be returned. If all free regions are visited without * func returning non-zero, then zero will be returned. */ -int __weak arch_kexec_walk_mem(struct kexec_buf *kbuf, - int (*func)(struct resource *, void *)) +static int kexec_walk_resources(struct kexec_buf *kbuf, + int (*func)(struct resource *, void *)) { if (kbuf->image->type == KEXEC_TYPE_CRASH) return walk_iomem_res_desc(crashk_res.desc, @@ -536,7 +586,10 @@ int kexec_locate_mem_hole(struct kexec_buf *kbuf) if (kbuf->mem != KEXEC_BUF_MEM_UNKNOWN) return 0; - ret = arch_kexec_walk_mem(kbuf, locate_mem_hole_callback); + if (IS_ENABLED(CONFIG_ARCH_DISCARD_MEMBLOCK)) + ret = kexec_walk_resources(kbuf, locate_mem_hole_callback); + else + ret = kexec_walk_memblock(kbuf, locate_mem_hole_callback); return ret == 1 ? 0 : -EADDRNOTAVAIL; }