From nobody Mon Apr 6 01:43:49 2026 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 286B6C6FA82 for ; Tue, 13 Sep 2022 06:42:18 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230095AbiIMGmQ (ORCPT ); Tue, 13 Sep 2022 02:42:16 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:35712 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230471AbiIMGmM (ORCPT ); Tue, 13 Sep 2022 02:42:12 -0400 Received: from mga01.intel.com (mga01.intel.com [192.55.52.88]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 586DF58526 for ; Mon, 12 Sep 2022 23:42:11 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1663051331; x=1694587331; h=from:to:cc:subject:date:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=C4y1rYIKX4fqF3zCci/fAjCkU8Jw0wyitSdCTFzi5Ss=; b=mjSob+YMQYY64k3ihyki+pZfl863gax3uHEjNt2/LFUbjM7KgfQV0CMI e1JsANF+WLhlHPLUZL6UmH1pwOuFf7WHhM5sgZJ2L9yIagDQIAE7f6Kmt NTVzMysNuxmVzv0TYZfmgzTy+vPAFOfm1tp7Dlqxthp4KLzGFCgq02PJx UGrJIrsrS9bHgpKrYWv+d7ryZu37wzzXLDmQQAn0SWDLAC7ODY6O2nJZY nWdeV3V6kkCRnib5B3FFIf0XlHMxK6mOdEFGf8nrPA8OnQlW9TCQJvEmu 0kqdbjzm47icjKmow91RVNIuS6oRb6u5ujoHfzKkDs6Tvg85OmuuSRCnh A==; X-IronPort-AV: E=McAfee;i="6500,9779,10468"; a="324296478" X-IronPort-AV: E=Sophos;i="5.93,312,1654585200"; d="scan'208";a="324296478" Received: from fmsmga008.fm.intel.com ([10.253.24.58]) by fmsmga101.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 12 Sep 2022 23:41:56 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.93,312,1654585200"; d="scan'208";a="678428866" Received: from q.bj.intel.com ([10.238.154.102]) by fmsmga008.fm.intel.com with ESMTP; 12 Sep 2022 23:41:53 -0700 From: shaoqin.huang@intel.com To: rppt@kernel.org Cc: Shaoqin Huang , Karolina Drobnik , Rebecca Mckeever , David Hildenbrand , linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 2/3] memblock test: Add test to memblock_reserve() 129th region Date: Tue, 13 Sep 2022 14:41:31 +0800 Message-Id: <20220913064138.407601-3-shaoqin.huang@intel.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220913064138.407601-1-shaoqin.huang@intel.com> References: <20220913064138.407601-1-shaoqin.huang@intel.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Shaoqin Huang Reserve 129th region in the memblock, and this will trigger the memblock_double_array() function, this needs valid memory regions. So using dummy_physical_memory_init() to allocate a valid memory region. At the same time, reserve 128 faked memory region, and make sure these reserved region not intersect with the valid memory region. So memblock_double_array() will choose the valid memory region, and it will success. Also need to restore the reserved.regions after memblock_double_array(), to make sure the subsequent tests can run as normal. Signed-off-by: Shaoqin Huang --- tools/testing/memblock/tests/basic_api.c | 90 ++++++++++++++++++++++++ 1 file changed, 90 insertions(+) diff --git a/tools/testing/memblock/tests/basic_api.c b/tools/testing/membl= ock/tests/basic_api.c index 7120fd8e47b1..1924524ad868 100644 --- a/tools/testing/memblock/tests/basic_api.c +++ b/tools/testing/memblock/tests/basic_api.c @@ -895,6 +895,95 @@ static int memblock_reserve_near_max_check(void) return 0; } =20 +/* + * A test that trying to reserve the 129th memory block. + * Expect to trigger memblock_double_array() to double the + * memblock.memory.max, find a new valid memory as + * reserved.regions. + */ +static int memblock_reserve_many_check(void) +{ + int i; + void *orig_region; + struct region r =3D { + .base =3D SZ_16K, + .size =3D MEM_SIZE, + }; + phys_addr_t memory_base =3D SZ_128K; + phys_addr_t new_reserved_regions_size; + + PREFIX_PUSH(); + + reset_memblock_regions(); + memblock_allow_resize(); + + /* Add a valid memory region used by double_array(). */ + dummy_physical_memory_init(); + memblock_add(dummy_physical_memory_base(), MEM_SIZE); + + for (i =3D 0; i < INIT_MEMBLOCK_REGIONS; i++) { + /* Reserve some fakes memory region to fulfill the memblock. */ + memblock_reserve(memory_base, MEM_SIZE); + + ASSERT_EQ(memblock.reserved.cnt, i + 1); + ASSERT_EQ(memblock.reserved.total_size, (i + 1) * MEM_SIZE); + + /* Keep the gap so these memory region will not be merged. */ + memory_base +=3D MEM_SIZE * 2; + } + + orig_region =3D memblock.reserved.regions; + + /* This reserve the 129 memory_region, and makes it double array. */ + memblock_reserve(memory_base, MEM_SIZE); + + /* + * This is the memory region size used by the doubled reserved.regions, + * and it has been reserved due to it has been used. The size is used to + * calculate the total_size that the memblock.reserved have now. + */ + new_reserved_regions_size =3D PAGE_ALIGN((INIT_MEMBLOCK_REGIONS * 2) * + sizeof(struct memblock_region)); + /* + * The double_array() will find a free memory region as the new + * reserved.regions, and the used memory region will be reserved, so + * there will be one more region exist in the reserved memblock. And the + * one more reserved region's size is new_reserved_regions_size. + */ + ASSERT_EQ(memblock.reserved.cnt, INIT_MEMBLOCK_REGIONS + 2); + ASSERT_EQ(memblock.reserved.total_size, (INIT_MEMBLOCK_REGIONS + 1) * MEM= _SIZE + + new_reserved_regions_size); + ASSERT_EQ(memblock.reserved.max, INIT_MEMBLOCK_REGIONS * 2); + + /* + * Now memblock_double_array() works fine. Let's check after the + * double_array(), the memblock_reserve() still works as normal. + */ + memblock_reserve(r.base, r.size); + ASSERT_EQ(memblock.reserved.regions[0].base, r.base); + ASSERT_EQ(memblock.reserved.regions[0].size, r.size); + + ASSERT_EQ(memblock.reserved.cnt, INIT_MEMBLOCK_REGIONS + 3); + ASSERT_EQ(memblock.reserved.total_size, (INIT_MEMBLOCK_REGIONS + 2) * MEM= _SIZE + + new_reserved_regions_size); + ASSERT_EQ(memblock.reserved.max, INIT_MEMBLOCK_REGIONS * 2); + + dummy_physical_memory_cleanup(); + + /* + * The current reserved.regions is occupying a range of memory that + * allocated from dummy_physical_memory_init(). After free the memory, + * we must not use it. So restore the origin memory region to make sure + * the tests can run as normal and not affected by the double array. + */ + memblock.reserved.regions =3D orig_region; + memblock.reserved.cnt =3D INIT_MEMBLOCK_REGIONS; + + test_pass_pop(); + + return 0; +} + static int memblock_reserve_checks(void) { prefix_reset(); @@ -909,6 +998,7 @@ static int memblock_reserve_checks(void) memblock_reserve_twice_check(); memblock_reserve_between_check(); memblock_reserve_near_max_check(); + memblock_reserve_many_check(); =20 prefix_pop(); =20 --=20 2.34.1