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[2620:137:e000::1:20]) by mx.google.com with ESMTP id b22-20020a170906709600b0078d4b605b71si4818370ejk.338.2022.10.26.01.05.35; Wed, 26 Oct 2022 01:06:00 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) client-ip=2620:137:e000::1:20; Authentication-Results: mx.google.com; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:20 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233250AbiJZH4p (ORCPT + 99 others); Wed, 26 Oct 2022 03:56:45 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56896 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232935AbiJZH4m (ORCPT ); Wed, 26 Oct 2022 03:56:42 -0400 Received: from loongson.cn (mail.loongson.cn [114.242.206.163]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id BFD3E9E2F5 for ; Wed, 26 Oct 2022 00:56:39 -0700 (PDT) Received: from loongson.cn (unknown [10.20.42.32]) by gateway (Coremail) with SMTP id _____8Dxfbc26FhjgI4CAA--.5005S3; Wed, 26 Oct 2022 15:56:38 +0800 (CST) Received: from loongson-pc.loongson.cn (unknown [10.20.42.32]) by localhost.localdomain (Coremail) with SMTP id AQAAf8Dx_eE26FhjnjMFAA--.19364S2; Wed, 26 Oct 2022 15:56:38 +0800 (CST) From: Jianmin Lv To: Huacai Chen , WANG Xuerui Cc: linux-kernel@vger.kernel.org, loongarch@lists.linux.dev Subject: [PATCH] LoongArch: Fix memsection size Date: Wed, 26 Oct 2022 15:56:38 +0800 Message-Id: <20221026075638.9396-1-lvjianmin@loongson.cn> X-Mailer: git-send-email 2.20.1 MIME-Version: 1.0 X-CM-TRANSID: AQAAf8Dx_eE26FhjnjMFAA--.19364S2 X-CM-SenderInfo: 5oymxthqpl0qxorr0wxvrqhubq/ X-Coremail-Antispam: 1Uk129KBjvJXoW7Ar17Cr48uFy5JFyxZrWrXwb_yoW8Xw18pF nF9r1kKrs8WF4fCr4Iy3s8uFy5K395u34UtF98Z34DCw43WF1vyr4jywsrZF9rXw48AFWI qFZxXw4kZayUA3DanT9S1TB71UUUUUUqnTZGkaVYY2UrUUUUj1kv1TuYvTs0mT0YCTnIWj qI5I8CrVACY4xI64kE6c02F40Ex7xfYxn0WfASr-VFAUDa7-sFnT9fnUUIcSsGvfJTRUUU b7kYFVCjjxCrM7AC8VAFwI0_Jr0_Gr1l1xkIjI8I6I8E6xAIw20EY4v20xvaj40_Wr0E3s 1l1IIY67AEw4v_JrI_Jryl8cAvFVAK0II2c7xJM28CjxkF64kEwVA0rcxSw2x7M28EF7xv wVC0I7IYx2IY67AKxVWUJVWUCwA2z4x0Y4vE2Ix0cI8IcVCY1x0267AKxVWUJVW8JwA2z4 x0Y4vEx4A2jsIE14v26r4UJVWxJr1l84ACjcxK6I8E87Iv6xkF7I0E14v26F4UJVW0owAS 0I0E0xvYzxvE52x082IY62kv0487Mc804VCY07AIYIkI8VC2zVCFFI0UMc02F40EFcxC0V AKzVAqx4xG6I80ewAv7VC0I7IYx2IY67AKxVWUJVWUGwAv7VC2z280aVAFwI0_Jr0_Gr1l Ox8S6xCaFVCjc4AY6r1j6r4UM4x0Y48IcxkI7VAKI48JMxAIw28IcxkI7VAKI48JMxC20s 026xCaFVCjc4AY6r1j6r4UMI8I3I0E5I8CrVAFwI0_Jr0_Jr4lx2IqxVCjr7xvwVAFwI0_ JrI_JrWlx4CE17CEb7AF67AKxVWUAVWUtwCIc40Y0x0EwIxGrwCI42IY6xIIjxv20xvE14 v26r1j6r1xMIIF0xvE2Ix0cI8IcVCY1x0267AKxVWUJVW8JwCI42IY6xAIw20EY4v20xva j40_Jr0_JF4lIxAIcVC2z280aVAFwI0_Jr0_Gr1lIxAIcVC2z280aVCY1x0267AKxVWUJV W8JbIYCTnIWIevJa73UjIFyTuYvjxU25EfUUUUU X-Spam-Status: No, score=-1.9 required=5.0 tests=BAYES_00,SPF_HELO_PASS, SPF_PASS autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org X-getmail-retrieved-from-mailbox: =?utf-8?q?INBOX?= X-GMAIL-THRID: =?utf-8?q?1747736656137452996?= X-GMAIL-MSGID: =?utf-8?q?1747736656137452996?= On LoongArch, the physical address space ranging from 0 to 0xfffffff is always memory, which is in the low half of the memsection range from 0 to 0x1fffffff with 512M memsection size, and the high half will be a hole with invalid memory pages. This situation may cause some issues. For example, the range of 0x10000000 to 0x1fffffff is io registers, which will be considered as valid memory range since which is in the memsection of range of 0 to 0x1fffffff. During S3 sleep and resume, these io registers will be saved and restored as valid memory page (pfn_valid() of common version considers that all pages in a memsection are valid), which will cause exception, especially when restoring during resume. We can use 256M size for memsection of LoongArch, or use the way as ARM64 to walk through all memory memblock to check if a mem pfn is valid which maybe lower performance. For simplicity, this patch just use the former way. Signed-off-by: Jianmin Lv diff --git a/arch/loongarch/include/asm/sparsemem.h b/arch/loongarch/include/asm/sparsemem.h index 3d18cdf1b069..05903b40a625 100644 --- a/arch/loongarch/include/asm/sparsemem.h +++ b/arch/loongarch/include/asm/sparsemem.h @@ -8,7 +8,7 @@ * SECTION_SIZE_BITS 2^N: how big each section will be * MAX_PHYSMEM_BITS 2^N: how much memory we can have in that space */ -#define SECTION_SIZE_BITS 29 /* 2^29 = Largest Huge Page Size */ +#define SECTION_SIZE_BITS 28 #define MAX_PHYSMEM_BITS 48 #endif /* CONFIG_SPARSEMEM */