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 5C587C63797 for ; Thu, 12 Jan 2023 16:01:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232564AbjALQBL (ORCPT ); Thu, 12 Jan 2023 11:01:11 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42066 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S234146AbjALQAn (ORCPT ); Thu, 12 Jan 2023 11:00:43 -0500 Received: from mail-qt1-x836.google.com (mail-qt1-x836.google.com [IPv6:2607:f8b0:4864:20::836]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B0E5A625C for ; Thu, 12 Jan 2023 07:53:36 -0800 (PST) Received: by mail-qt1-x836.google.com with SMTP id z12so16745106qtv.5 for ; Thu, 12 Jan 2023 07:53:36 -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=0GttG9cGo2fGw7Ie6+QYs6E6KpCITpSOtaS4vLsszc8=; b=Cs86hcYwXW1kyT1Ar3qnL76ZCbnEz0PuLFPljmDEP02SjXoY1Z3RjcF2o1cZcrfit5 QsRJZD+pHkF5Lp65YJU8iZVYq4d7OoijI3kadHA/0fI4edzur6B4RGyBR3E4vF662I/j wNEecnuesci1bDHq9WwQtoP5yUf7oWgsfjkZY6J0nUR1rgflYRRAS4sWd2NT04xkGNd1 biHCt1RQu1AIGF++m/rRURQXtxdvBzCNjbZDBLpYJd7CRbWoeaX/X1UlYq/ECAWaQ3II //PX23Rf28b9O8k3iB6GI8CVbc4v8x/BmlLTWUreFOpaZbasteZ4LBpLbnySid+akRmc d17g== 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=0GttG9cGo2fGw7Ie6+QYs6E6KpCITpSOtaS4vLsszc8=; b=uji2i+H0XuWauqeu8gnwFLHfy0MrUUV+hoZm6VP8BJ5mgJNhGgI7bE2/YzwqRxwCQe VPZ02dyom8jH7iWMJ0KDKKW5TNWs+6GmJc/sNoHcVLF+WyaSqcGBNuVf823qyB2W8iry 2HT05CSQdoXlbBXSUeFbh28pTMCMMArKVuIKyWEc2CD1gbZrjY6S9eII36B/4wJjC+bG TkUu0EC3VNtT5x5ebf9+hgIFLpTV2kXWDGA04dUcOSijtr+ZVCjwegb4k3JfKaOdRmi9 tYsr76FN1FaPrTDd2yEytI4k6bEJ3tG5WEcjHP5sy7rpyxMWXHCeimFR0GMcjKuyiNBz xmVg== X-Gm-Message-State: AFqh2kr1sLHe39hNFw2p9/AczT85QPPKqdG3RQiU8NFcbcQJrBQ1cErh 240ah/ClId2CN/gHdHFghOg= X-Google-Smtp-Source: AMrXdXujjvIkIMxOnezoY+bqzXiyRl7Otg+3lH6xNrFMGBGSGIg4NYiYb1pdv7pwlHe5tHHIls2pwQ== X-Received: by 2002:ac8:7409:0:b0:3b1:691f:3d7a with SMTP id p9-20020ac87409000000b003b1691f3d7amr5867423qtq.68.1673538815891; Thu, 12 Jan 2023 07:53:35 -0800 (PST) Received: from vultr.guest ([173.199.122.241]) by smtp.gmail.com with ESMTPSA id l17-20020ac848d1000000b003ab43dabfb1sm9280836qtr.55.2023.01.12.07.53.34 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 12 Jan 2023 07:53:35 -0800 (PST) From: Yafang Shao To: 42.hyeyoo@gmail.com, vbabka@suse.cz, 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 Cc: linux-mm@kvack.org, bpf@vger.kernel.org, Yafang Shao Subject: [RFC PATCH bpf-next v2 02/11] mm: percpu: introduce percpu_size() Date: Thu, 12 Jan 2023 15:53:17 +0000 Message-Id: <20230112155326.26902-3-laoar.shao@gmail.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20230112155326.26902-1-laoar.shao@gmail.com> References: <20230112155326.26902-1-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 --- 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