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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id D247AC05027 for ; Thu, 2 Feb 2023 01:42:25 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231262AbjBBBmY (ORCPT ); Wed, 1 Feb 2023 20:42:24 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47148 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229660AbjBBBmX (ORCPT ); Wed, 1 Feb 2023 20:42:23 -0500 Received: from mail-pj1-x1031.google.com (mail-pj1-x1031.google.com [IPv6:2607:f8b0:4864:20::1031]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id CDBD877526 for ; Wed, 1 Feb 2023 17:42:22 -0800 (PST) Received: by mail-pj1-x1031.google.com with SMTP id j5so498699pjn.5 for ; Wed, 01 Feb 2023 17:42:22 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=HRKKHzUPeYRgy9sp4sc6HU9jmgQ/kndp4UTR0lBuLfE=; b=XgJCNvo3Mxgtg5Cm1ISnzALszmieUGA5g+mJmIl1lai7/r9rTtYkS3lVzxT8o3lN9P M07KKCtnz0xTxGyblruhALIg8QtCdiv0QIEPRfGk63fKr+7soH35NVOt9nlCiG6uZMI1 6C8k8MP6uMuCdf3W9QcjepEoOVtGmdI8Wp/s/Q9Z2mWDgX2AAC4YUXmgK4/NU1E5OFtY bm1PQVqxf9D4x3Wiski2pMGKHx1GH+/fEne7NjldfB6ly5ft+PiCb2uiJJ1G/VxOcJee wrj6uM4nSHqYrDuB9s+QK7xx9U+P75pCWOuCwgfEHRqrLxuxOo0FpP9kShHIcslp/3gK +WAg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=HRKKHzUPeYRgy9sp4sc6HU9jmgQ/kndp4UTR0lBuLfE=; b=tTThvvRnUmThnjpirb1CHPvpxPMb/BbqckNBqpuztUoSY7M0aDj5nioriqP/eFn9Yw FLEcLTRXUgEIE6AwZ0us+7nOnnNll3s+TZJ9RAFYOjidT3h1V89VIsoZvvyV2SkpCYNj mGLTN22Z//do+3YC/Oq/Wdp1keOVTL1U/WwI7UOBMyHaRClXg4XnmQwAyzwbxM4kYeJ3 2wMBtL3Ym+P6UdmKkYCwjj8aiRQQ7DBByaWipo5hY1pBge0puijVDjTk7KGbxX7ZfHdI ROTWDS/CNZfyEqWydxIMHqhvdPn/9sda1EpFEdmfA7yxqyG4+YYJcVJWPceBFXnl/gDF 2vYQ== X-Gm-Message-State: AO0yUKVOVrxv4TU6Jn1RsxQ3DC59DixmgHp1bRopPWZXuP7DkNxlMhFO MMt/o52FSkFgve+/37Ye6Ag= X-Google-Smtp-Source: AK7set9GF2+wbpIKssdijZ0MvTlGQkES0Y8qB6dhHwsPA23hO7kBC462w0w9sb2JVm95BPkSBvmTuQ== X-Received: by 2002:a17:90a:1997:b0:230:3af9:177 with SMTP id 23-20020a17090a199700b002303af90177mr693628pji.8.1675302142358; Wed, 01 Feb 2023 17:42:22 -0800 (PST) Received: from vultr.guest ([2001:19f0:7001:3f48:5400:4ff:fe4a:8c8b]) by smtp.gmail.com with ESMTPSA id t191-20020a6381c8000000b004e8f7f23c4bsm6594205pgd.76.2023.02.01.17.42.17 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 01 Feb 2023 17:42:22 -0800 (PST) From: Yafang Shao To: ast@kernel.org, daniel@iogearbox.net, andrii@kernel.org, kafai@fb.com, songliubraving@fb.com, yhs@fb.com, john.fastabend@gmail.com, kpsingh@kernel.org, sdf@google.com, haoluo@google.com, jolsa@kernel.org, tj@kernel.org, dennis@kernel.org, cl@linux.com, akpm@linux-foundation.org, penberg@kernel.org, rientjes@google.com, iamjoonsoo.kim@lge.com, roman.gushchin@linux.dev, 42.hyeyoo@gmail.com, vbabka@suse.cz, urezki@gmail.com Cc: linux-mm@kvack.org, bpf@vger.kernel.org, Yafang Shao Subject: [PATCH bpf-next 2/7] mm: percpu: introduce percpu_size() Date: Thu, 2 Feb 2023 01:41:53 +0000 Message-Id: <20230202014158.19616-3-laoar.shao@gmail.com> X-Mailer: git-send-email 2.39.0 In-Reply-To: <20230202014158.19616-1-laoar.shao@gmail.com> References: <20230202014158.19616-1-laoar.shao@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: bpf@vger.kernel.org Introduce a new helper percpu_size() to report full size of underlying allocation of a percpu address. Signed-off-by: Yafang Shao Cc: Dennis Zhou Cc: Tejun Heo Cc: Christoph Lameter --- include/linux/percpu.h | 1 + mm/percpu.c | 35 +++++++++++++++++++++++++++++++++++ 2 files changed, 36 insertions(+) diff --git a/include/linux/percpu.h b/include/linux/percpu.h index 1338ea2..7be4234 100644 --- a/include/linux/percpu.h +++ b/include/linux/percpu.h @@ -137,5 +137,6 @@ extern int __init pcpu_page_first_chunk(size_t reserved_size, __alignof__(type)) extern unsigned long pcpu_nr_pages(void); +extern size_t percpu_size(void __percpu *ptr); #endif /* __LINUX_PERCPU_H */ diff --git a/mm/percpu.c b/mm/percpu.c index acd78da..5580688 100644 --- a/mm/percpu.c +++ b/mm/percpu.c @@ -2302,6 +2302,41 @@ void free_percpu(void __percpu *ptr) } EXPORT_SYMBOL_GPL(free_percpu); +/** + * percpu_size - report full size of underlying allocation of percpu addr + * @ptr: pointer to percpu area + * + * CONTEXT: + * Can be called from atomic context. + */ +size_t percpu_size(void __percpu *ptr) +{ + int bit_off, bits, end, off, size; + struct pcpu_chunk *chunk; + unsigned long flags; + void *addr; + + if (!ptr) + return 0; + + addr = __pcpu_ptr_to_addr(ptr); + + spin_lock_irqsave(&pcpu_lock, flags); + chunk = pcpu_chunk_addr_search(addr); + off = addr - chunk->base_addr; + bit_off = off / PCPU_MIN_ALLOC_SIZE; + + /* find end index */ + end = find_next_bit(chunk->bound_map, pcpu_chunk_map_bits(chunk), + bit_off + 1); + spin_unlock_irqrestore(&pcpu_lock, flags); + + bits = end - bit_off; + size = bits * PCPU_MIN_ALLOC_SIZE; + + return pcpu_obj_full_size(size); +} + bool __is_kernel_percpu_address(unsigned long addr, unsigned long *can_addr) { #ifdef CONFIG_SMP -- 1.8.3.1