From patchwork Wed Jun 2 08:55:17 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Kefeng Wang X-Patchwork-Id: 12293479 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=-17.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham 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 240A0C4708F for ; Wed, 2 Jun 2021 09:02:17 +0000 (UTC) Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E4B3A613AA for ; Wed, 2 Jun 2021 09:02:16 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E4B3A613AA Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=huawei.com Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-ID:Date:Subject:CC:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=y/ikvowseD4dA+kZM/uu0QBZ78U6Uot7F5DxG6GpBaQ=; b=L/ThDaZjYwzlYF w+xen9oWZiu6haN8ctax9ZD/6Jk6PuPriTRhVA1V0pltwVXKikhSc3ZJDvhvgKq62hbbatqphmmgY 3GTNwHXjWGMQcoCOkKK9FLphR7z8uS0/YM/TKqLVIaF3LeZGvnq9au2otuLD+UIIV+0US+nJI1uyi cwTZ7CJvKqGK5dcohH5Xn3dBFu2QRe4bC28UKPrCS/eohVyzbksLPBDx2QiKiAtAaxnBzfjJLiHXK KnKlL+eFit87voUABzj55cs2VeS7sytprWXMYVZ3WB6GqAX1EqJ40alWvbbvtKMVFl2N8YMo8NjWL TiQKGDjp6NeNS2HWFXOg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1loMlF-002qTN-Je; Wed, 02 Jun 2021 09:02:01 +0000 Received: from szxga01-in.huawei.com ([45.249.212.187]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1loMVz-002lCO-JW for linux-riscv@lists.infradead.org; Wed, 02 Jun 2021 08:46:17 +0000 Received: from dggemv711-chm.china.huawei.com (unknown [172.30.72.56]) by szxga01-in.huawei.com (SkyGuard) with ESMTP id 4Fw2cK0XPCzYpCy; Wed, 2 Jun 2021 16:43:29 +0800 (CST) Received: from dggpemm500001.china.huawei.com (7.185.36.107) by dggemv711-chm.china.huawei.com (10.1.198.66) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Wed, 2 Jun 2021 16:46:13 +0800 Received: from localhost.localdomain.localdomain (10.175.113.25) by dggpemm500001.china.huawei.com (7.185.36.107) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256) id 15.1.2176.2; Wed, 2 Jun 2021 16:46:13 +0800 From: Kefeng Wang To: , Palmer Dabbelt , CC: Paul Walmsley , Kefeng Wang Subject: [PATCH 2/2] riscv: Add mem kernel parameter support Date: Wed, 2 Jun 2021 16:55:17 +0800 Message-ID: <20210602085517.127481-2-wangkefeng.wang@huawei.com> X-Mailer: git-send-email 2.26.2 In-Reply-To: <20210602085517.127481-1-wangkefeng.wang@huawei.com> References: <20210602085517.127481-1-wangkefeng.wang@huawei.com> MIME-Version: 1.0 X-Originating-IP: [10.175.113.25] X-ClientProxiedBy: dggems701-chm.china.huawei.com (10.3.19.178) To dggpemm500001.china.huawei.com (7.185.36.107) X-CFilter-Loop: Reflected X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210602_014615_850385_E0569DBA X-CRM114-Status: GOOD ( 13.20 ) X-BeenThere: linux-riscv@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org The memblock_enforce_memory_limit() could change the memblock range, so move the dram_end assignment after it in bootmem_init(), then support mem= cmdline. Signed-off-by: Kefeng Wang --- arch/riscv/mm/init.c | 29 +++++++++++++++++++++++++---- 1 file changed, 25 insertions(+), 4 deletions(-) diff --git a/arch/riscv/mm/init.c b/arch/riscv/mm/init.c index 17f2e1da2b3d..ce61510a08c0 100644 --- a/arch/riscv/mm/init.c +++ b/arch/riscv/mm/init.c @@ -127,19 +127,39 @@ void __init mem_init(void) print_vm_layout(); } +/* + * The default maximal physical memory size is -PAGE_OFFSET, + * limit the memory size via mem. + */ +static phys_addr_t memory_limit = -PAGE_OFFSET; + +static int __init early_mem(char *p) +{ + u64 size; + + if (!p) + return 1; + + size = memparse(p, &p) & PAGE_MASK; + memory_limit = min_t(u64, size, memory_limit); + + pr_notice("Memory limited to %lldMB\n", (u64)memory_limit >> 20); + + return 0; +} +early_param("mem", early_mem); + void __init setup_bootmem(void) { phys_addr_t vmlinux_end = __pa_symbol(&_end); phys_addr_t vmlinux_start = __pa_symbol(&_start); - phys_addr_t dram_end = memblock_end_of_DRAM(); phys_addr_t max_mapped_addr = __pa(~(ulong)0); + phys_addr_t dram_end; #ifdef CONFIG_XIP_KERNEL vmlinux_start = __pa_symbol(&_sdata); #endif - - /* The maximal physical memory size is -PAGE_OFFSET. */ - memblock_enforce_memory_limit(-PAGE_OFFSET); + memblock_enforce_memory_limit(memory_limit); /* * Reserve from the start of the kernel to the end of the kernel @@ -154,6 +174,7 @@ void __init setup_bootmem(void) #endif memblock_reserve(vmlinux_start, vmlinux_end - vmlinux_start); + dram_end = memblock_end_of_DRAM(); /* * memblock allocator is not aware of the fact that last 4K bytes of * the addressable memory can not be mapped because of IS_ERR_VALUE