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 2083AC433FE for ; Mon, 13 Dec 2021 12:28:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235483AbhLMM2e (ORCPT ); Mon, 13 Dec 2021 07:28:34 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:32161 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235297AbhLMM2Y (ORCPT ); Mon, 13 Dec 2021 07:28:24 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1639398503; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:in-reply-to:in-reply-to:references:references; bh=rTXDZrXPlfq+xyqjAIT5qWvY4GCGUra41drHaxTKJRM=; b=CaKcwIoOZip5jjgQz/H3WYuLJE796rJj9t6hGH+bCSuUYCk6y7sMfWPT3a3yrNnuWMb9IH Il465OyEnMnHnz1rpH2f1l0uRTJfNQgUzjms5L0hT503CRBPDeDXWWGUW3uq3sC/seRUJH a0pOyYFNRIlkKAQWZfr7VFquuo3PRWY= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-22-9Iu2KUIaNiGiv9ltAQ48bA-1; Mon, 13 Dec 2021 07:28:18 -0500 X-MC-Unique: 9Iu2KUIaNiGiv9ltAQ48bA-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.phx2.redhat.com [10.5.11.13]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 166601853028; Mon, 13 Dec 2021 12:28:17 +0000 (UTC) Received: from MiWiFi-R3L-srv.redhat.com (ovpn-12-202.pek2.redhat.com [10.72.12.202]) by smtp.corp.redhat.com (Postfix) with ESMTP id DC973694D8; Mon, 13 Dec 2021 12:27:51 +0000 (UTC) From: Baoquan He To: linux-kernel@vger.kernel.org Cc: linux-mm@kvack.org, akpm@linux-foundation.org, hch@lst.de, cl@linux.com, John.p.donnelly@oracle.com, kexec@lists.infradead.org, bhe@redhat.com, stable@vger.kernel.org, Marek Szyprowski , Robin Murphy , iommu@lists.linux-foundation.org Subject: [PATCH v3 4/5] dma/pool: create dma atomic pool only if dma zone has managed pages Date: Mon, 13 Dec 2021 20:27:11 +0800 Message-Id: <20211213122712.23805-5-bhe@redhat.com> In-Reply-To: <20211213122712.23805-1-bhe@redhat.com> References: <20211213122712.23805-1-bhe@redhat.com> X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently three dma atomic pools are initialized as long as the relevant kernel codes are built in. While in kdump kernel of x86_64, this is not right when trying to create atomic_pool_dma, because there's no managed pages in DMA zone. In the case, DMA zone only has low 1M memory presented and locked down by memblock allocator. So no pages are added into buddy of DMA zone. Please check commit f1d4d47c5851 ("x86/setup: Always reserve the first 1M of RAM"). Then in kdump kernel of x86_64, it always prints below failure message: DMA: preallocated 128 KiB GFP_KERNEL pool for atomic allocations swapper/0: page allocation failure: order:5, mode:0xcc1(GFP_KERNEL|GFP_DMA), nodemask=(null),cpuset=/,mems_allowed=0 CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.13.0-0.rc5.20210611git929d931f2b40.42.fc35.x86_64 #1 Hardware name: Dell Inc. PowerEdge R910/0P658H, BIOS 2.12.0 06/04/2018 Call Trace: dump_stack+0x7f/0xa1 warn_alloc.cold+0x72/0xd6 ? _raw_spin_unlock_irq+0x24/0x40 ? __alloc_pages_direct_compact+0x90/0x1b0 __alloc_pages_slowpath.constprop.0+0xf29/0xf50 ? __cond_resched+0x16/0x50 ? prepare_alloc_pages.constprop.0+0x19d/0x1b0 __alloc_pages+0x24d/0x2c0 ? __dma_atomic_pool_init+0x93/0x93 alloc_page_interleave+0x13/0xb0 atomic_pool_expand+0x118/0x210 ? __dma_atomic_pool_init+0x93/0x93 __dma_atomic_pool_init+0x45/0x93 dma_atomic_pool_init+0xdb/0x176 do_one_initcall+0x67/0x320 ? rcu_read_lock_sched_held+0x3f/0x80 kernel_init_freeable+0x290/0x2dc ? rest_init+0x24f/0x24f kernel_init+0xa/0x111 ret_from_fork+0x22/0x30 Mem-Info: ...... DMA: failed to allocate 128 KiB GFP_KERNEL|GFP_DMA pool for atomic allocation DMA: preallocated 128 KiB GFP_KERNEL|GFP_DMA32 pool for atomic allocations Here, let's check if DMA zone has managed pages, then create atomic_pool_dma if yes. Otherwise just skip it. Fixes: 6f599d84231f ("x86/kdump: Always reserve the low 1M when the crashkernel option is specified") Cc: stable@vger.kernel.org Signed-off-by: Baoquan He Cc: Christoph Hellwig Cc: Marek Szyprowski Cc: Robin Murphy Cc: iommu@lists.linux-foundation.org --- kernel/dma/pool.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/kernel/dma/pool.c b/kernel/dma/pool.c index 5a85804b5beb..00df3edd6c5d 100644 --- a/kernel/dma/pool.c +++ b/kernel/dma/pool.c @@ -206,7 +206,7 @@ static int __init dma_atomic_pool_init(void) GFP_KERNEL); if (!atomic_pool_kernel) ret = -ENOMEM; - if (IS_ENABLED(CONFIG_ZONE_DMA)) { + if (has_managed_dma()) { atomic_pool_dma = __dma_atomic_pool_init(atomic_pool_size, GFP_KERNEL | GFP_DMA); if (!atomic_pool_dma) @@ -229,7 +229,7 @@ static inline struct gen_pool *dma_guess_pool(struct gen_pool *prev, gfp_t gfp) if (prev == NULL) { if (IS_ENABLED(CONFIG_ZONE_DMA32) && (gfp & GFP_DMA32)) return atomic_pool_dma32; - if (IS_ENABLED(CONFIG_ZONE_DMA) && (gfp & GFP_DMA)) + if (atomic_pool_dma && (gfp & GFP_DMA)) return atomic_pool_dma; return atomic_pool_kernel; } -- 2.17.2