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Thread-Topic: [PATCH V2 3/3] Adding device_dma_parameters->offset_preserve_mask to NVMe driver. 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Wouldn't it be=0A= >> more efficient to set it once during device initialization?=0A= >>=0A= >> And more importantly, this isn't thread safe: one CPU may be setting the= =0A= >> device's dma alignment mask to 0 while another CPU is expecting it to be= =0A= >> NVME_CTRL_PAGE_SIZE - 1.=0A= > I was having trouble getting the OS booted when setting it once during= =0A= > initialization. However when I rebased to the latest rc6 this morning it= =0A= > seems to be working with setting the mask on probe. I am still testing o= ut=0A= > and will appreciate any idea what may cause the nvme driver to fail=0A= > with a single mask.=0A= Based on the Keith's comment it needs to be completely avoided in hot path.= =0A= =0A= Did you get a chance to bisect the problem in the rc6 ? We need to know the= =0A= root cause otherwise it might happen again after we add this patch.=0A= 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=-4.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 47D40C433DB for ; Tue, 2 Feb 2021 00:00:06 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id E421B64EDA for ; Tue, 2 Feb 2021 00:00:05 +0000 (UTC) DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org E421B64EDA Authentication-Results: mail.kernel.org; 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Thread-Topic: [PATCH V2 3/3] Adding device_dma_parameters->offset_preserve_mask to NVMe driver. 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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-nvme" Errors-To: linux-nvme-bounces+linux-nvme=archiver.kernel.org@lists.infradead.org On 2/1/21 13:27, Jianxiong Gao wrote: >> Why is this setting being done and undone on each IO? Wouldn't it be >> more efficient to set it once during device initialization? >> >> And more importantly, this isn't thread safe: one CPU may be setting the >> device's dma alignment mask to 0 while another CPU is expecting it to be >> NVME_CTRL_PAGE_SIZE - 1. > I was having trouble getting the OS booted when setting it once during > initialization. However when I rebased to the latest rc6 this morning it > seems to be working with setting the mask on probe. I am still testing out > and will appreciate any idea what may cause the nvme driver to fail > with a single mask. Based on the Keith's comment it needs to be completely avoided in hot path. Did you get a chance to bisect the problem in the rc6 ? We need to know the root cause otherwise it might happen again after we add this patch. _______________________________________________ Linux-nvme mailing list Linux-nvme@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-nvme 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=-3.5 required=3.0 tests=BAYES_00,DKIM_INVALID, DKIM_SIGNED,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE, SPF_PASS,URIBL_BLOCKED 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 024CEC433DB for ; Tue, 2 Feb 2021 00:49:09 +0000 (UTC) Received: from silver.osuosl.org (smtp3.osuosl.org [140.211.166.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id 918DA64D5D for ; 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Thread-Topic: [PATCH V2 3/3] Adding device_dma_parameters->offset_preserve_mask to NVMe driver. 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charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: iommu-bounces@lists.linux-foundation.org Sender: "iommu" On 2/1/21 13:27, Jianxiong Gao wrote: >> Why is this setting being done and undone on each IO? Wouldn't it be >> more efficient to set it once during device initialization? >> >> And more importantly, this isn't thread safe: one CPU may be setting the >> device's dma alignment mask to 0 while another CPU is expecting it to be >> NVME_CTRL_PAGE_SIZE - 1. > I was having trouble getting the OS booted when setting it once during > initialization. However when I rebased to the latest rc6 this morning it > seems to be working with setting the mask on probe. I am still testing out > and will appreciate any idea what may cause the nvme driver to fail > with a single mask. Based on the Keith's comment it needs to be completely avoided in hot path. Did you get a chance to bisect the problem in the rc6 ? We need to know the root cause otherwise it might happen again after we add this patch. _______________________________________________ iommu mailing list iommu@lists.linux-foundation.org https://lists.linuxfoundation.org/mailman/listinfo/iommu