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 X-Spam-Level: X-Spam-Status: No, score=-2.5 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3188AC433DF for ; Thu, 2 Jul 2020 17:55:10 +0000 (UTC) Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by mail.kernel.org (Postfix) with ESMTP id DC87F20760 for ; Thu, 2 Jul 2020 17:55:09 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org DC87F20760 Authentication-Results: mail.kernel.org; dmarc=none (p=none dis=none) header.from=arm.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=owner-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix) id 496F58D0014; Thu, 2 Jul 2020 13:55:09 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 445928D000C; Thu, 2 Jul 2020 13:55:09 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 35B348D0014; Thu, 2 Jul 2020 13:55:09 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from forelay.hostedemail.com (smtprelay0195.hostedemail.com [216.40.44.195]) by kanga.kvack.org (Postfix) with ESMTP id 1D5028D000C for ; Thu, 2 Jul 2020 13:55:09 -0400 (EDT) Received: from smtpin13.hostedemail.com (10.5.19.251.rfc1918.com [10.5.19.251]) by forelay02.hostedemail.com (Postfix) with ESMTP id ADC4D2C96 for ; Thu, 2 Jul 2020 17:55:08 +0000 (UTC) X-FDA: 76993887096.13.jewel64_600a46826e8b Received: from filter.hostedemail.com (10.5.16.251.rfc1918.com [10.5.16.251]) by smtpin13.hostedemail.com (Postfix) with ESMTP id 6FC4318140B75 for ; Thu, 2 Jul 2020 17:55:08 +0000 (UTC) X-HE-Tag: jewel64_600a46826e8b X-Filterd-Recvd-Size: 1871 Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf01.hostedemail.com (Postfix) with ESMTP for ; Thu, 2 Jul 2020 17:55:07 +0000 (UTC) Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id B4C1A1FB; Thu, 2 Jul 2020 10:55:06 -0700 (PDT) Received: from [192.168.122.166] (unknown [172.31.20.19]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 653B23F71E; Thu, 2 Jul 2020 10:55:06 -0700 (PDT) To: "linux-arm-kernel@lists.infradead.org" , linux-mm@kvack.org, "linux-usb@vger.kernel.org" , rientjes@google.com, Christoph Hellwig , Nicolas Saenz Julienne , "linux-kernel@vger.kernel.org" From: Jeremy Linton Subject: [BUG] XHCI getting ZONE_DMA32 memory > than its bus_dma_limit Message-ID: <34619bdf-6527-ae82-7e4d-e2ea7c67ed56@arm.com> Date: Thu, 2 Jul 2020 12:49:14 -0500 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 6FC4318140B75 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam01 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Hi, Using 5.8rc3: The rpi4 has a 3G dev->bus_dma_limit on its XHCI controller. With a usb3 hub, plus a few devices plugged in, randomly devices will fail operations. This appears to because xhci_alloc_container_ctx() is getting buffers > 3G via dma_pool_zalloc(). Tracking that down, it seems to be caused by dma_alloc_from_pool() using dev_to_pool()->dma_direct_optimal_gfp_mask() to "optimistically" select the atomic_pool_dma32 but then failing to verify that the allocations in the pool are less than the dev bus_dma_limit. Thanks,