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 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 smtp.lore.kernel.org (Postfix) with ESMTPS id 7C83CEE7FF4 for ; Mon, 11 Sep 2023 13:19:27 +0000 (UTC) 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=qdHmKz17tLuEyvHEcZHlU4vVUkHOI2jZjxCRjo/05HI=; b=a8ht247cB1Te26 xEQQ3auBoETyTr2/OSHfpz5fyRcXls56huUw2YIiq+BWavBiBgDPCluT4WEZnq/t9tYQAhwKexOGI 22SF1UdyMVKOd7VoPWgJEUZgaJ6EKq5ysQKCUM4FZFHpsTDdEU60az4+BnRntpnLr+VydHeFt/Jiw 7/m2mNFWKGxbO/9Od6c5M4GWqU4kHV0i0all8/9g1dMQ/rwUvngFHiZSvbjnK1SJL7PtGq0f5JO4+ 5l9Z0dVyQ783rbjEe+vN4avUirV65rENJp7EMS+HVx7GRrN6CCT7KOLq0wMfWyYSoH0HfXxz+iPFz E9yGsOoOyUhJd5BZoquQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.96 #2 (Red Hat Linux)) id 1qfgp3-000amW-2d; Mon, 11 Sep 2023 13:19:25 +0000 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]) by bombadil.infradead.org with esmtps (Exim 4.96 #2 (Red Hat Linux)) id 1qfgp0-000alY-1j for kexec@lists.infradead.org; Mon, 11 Sep 2023 13:19:24 +0000 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1694438359; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=Hbw5LcVAhn/MF5vOS6EegrWEmv1/qJLDPF4qVdxgL4s=; b=bHHZyfYgR+beSFNUnkeqcLUDaegdgq4Xo6uSjFMdSh+COl2ZFwhUyUlI9FvYHNmedl7YBy kTFZs/E6p3vkESdufKRaUy8bxyGCLvkWbsU9kBFtc3SxQ2ZtoZG+fzk8Z9s5c1qbLlrf++ sVQgW+qbbGksYeRyNhNKs4wH43k2PR8= Received: from mimecast-mx02.redhat.com (mx-ext.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-348-XQhtsyerOp25TxNVgyqOQg-1; Mon, 11 Sep 2023 09:19:16 -0400 X-MC-Unique: XQhtsyerOp25TxNVgyqOQg-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.rdu2.redhat.com [10.11.54.6]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id C1D0E38117E9; Mon, 11 Sep 2023 13:19:15 +0000 (UTC) Received: from piliu.users.ipa.redhat.com (unknown [10.72.120.8]) by smtp.corp.redhat.com (Postfix) with ESMTP id 617D12156701; Mon, 11 Sep 2023 13:19:11 +0000 (UTC) From: Pingfan Liu To: linuxppc-dev@lists.ozlabs.org Cc: Pingfan Liu , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Mahesh Salgaonkar , Wen Xiong , Baoquan He , Ming Lei , kexec@lists.infradead.org Subject: [PATCHv6 2/3] powerpc/setup: Handle the case when boot_cpuid greater than nr_cpus Date: Mon, 11 Sep 2023 21:18:54 +0800 Message-Id: <20230911131855.40738-3-piliu@redhat.com> In-Reply-To: <20230911131855.40738-1-piliu@redhat.com> References: <20230911131855.40738-1-piliu@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.6 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230911_061922_704372_1375814E X-CRM114-Status: GOOD ( 17.14 ) X-BeenThere: kexec@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "kexec" Errors-To: kexec-bounces+kexec=archiver.kernel.org@lists.infradead.org If the boot_cpuid is smaller than nr_cpus, it requires extra effort to ensure the boot_cpu is in cpu_present_mask. This can be achieved by reserving the last quota for the boot cpu. Note: the restriction on nr_cpus will be lifted with more effort in the next patch Signed-off-by: Pingfan Liu Cc: Michael Ellerman Cc: Nicholas Piggin Cc: Christophe Leroy Cc: Mahesh Salgaonkar Cc: Wen Xiong Cc: Baoquan He Cc: Ming Lei Cc: kexec@lists.infradead.org To: linuxppc-dev@lists.ozlabs.org --- arch/powerpc/kernel/setup-common.c | 25 ++++++++++++++++++++++--- 1 file changed, 22 insertions(+), 3 deletions(-) diff --git a/arch/powerpc/kernel/setup-common.c b/arch/powerpc/kernel/setup-common.c index a07af8de6674..58a988c64dd2 100644 --- a/arch/powerpc/kernel/setup-common.c +++ b/arch/powerpc/kernel/setup-common.c @@ -456,8 +456,8 @@ struct interrupt_server_node { void __init smp_setup_cpu_maps(void) { struct device_node *dn; - int shift = 0, cpu = 0; - int j, nthreads = 1; + int terminate, shift = 0, cpu = 0; + int j, bt_thread = 0, nthreads = 1; int len; struct interrupt_server_node *intserv_node, *n; struct list_head *bt_node, head; @@ -520,6 +520,7 @@ void __init smp_setup_cpu_maps(void) for (j = 0 ; j < nthreads; j++) { if (be32_to_cpu(intserv[j]) == boot_cpu_hwid) { bt_node = &intserv_node->node; + bt_thread = j; found_boot_cpu = true; /* * Record the round-shift between dt @@ -539,11 +540,21 @@ void __init smp_setup_cpu_maps(void) /* Select the primary thread, the boot cpu's slibing, as the logic 0 */ list_add_tail(&head, bt_node); pr_info("the round shift between dt seq and the cpu logic number: %d\n", shift); + terminate = nr_cpu_ids; list_for_each_entry(intserv_node, &head, node) { + j = 0; + /* Choose a start point to cover the boot cpu */ + if (nr_cpu_ids - 1 < bt_thread) { + /* + * The processor core puts assumption on the thread id, + * not to breach the assumption. + */ + terminate = nr_cpu_ids - 1; + } avail = intserv_node->avail; nthreads = intserv_node->len / sizeof(int); - for (j = 0; j < nthreads && cpu < nr_cpu_ids; j++) { + for (; j < nthreads && cpu < terminate; j++) { set_cpu_present(cpu, avail); set_cpu_possible(cpu, true); cpu_to_phys_id[cpu] = be32_to_cpu(intserv_node->intserv[j]); @@ -551,6 +562,14 @@ void __init smp_setup_cpu_maps(void) j, cpu, be32_to_cpu(intserv[j])); cpu++; } + /* Online the boot cpu */ + if (nr_cpu_ids - 1 < bt_thread) { + set_cpu_present(bt_thread, avail); + set_cpu_possible(bt_thread, true); + cpu_to_phys_id[bt_thread] = be32_to_cpu(intserv_node->intserv[bt_thread]); + DBG(" thread %d -> cpu %d (hard id %d)\n", + bt_thread, bt_thread, be32_to_cpu(intserv[bt_thread])); + } } list_for_each_entry_safe(intserv_node, n, &head, node) { -- 2.31.1 _______________________________________________ kexec mailing list kexec@lists.infradead.org http://lists.infradead.org/mailman/listinfo/kexec