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=-11.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=ham 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 AD11CC433E0 for ; Tue, 26 Jan 2021 11:55:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 77C332311E for ; Tue, 26 Jan 2021 11:55:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2405015AbhAZLz2 (ORCPT ); Tue, 26 Jan 2021 06:55:28 -0500 Received: from us-smtp-delivery-124.mimecast.com ([216.205.24.124]:37967 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2392571AbhAZLzN (ORCPT ); Tue, 26 Jan 2021 06:55:13 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1611662027; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc; bh=tf6SOP1+uSuFzlR74PmLs+Qb9Jg6cZLWh14S6+CIZes=; b=MhkV411IRAlYwWWABWXrSaKKYvTCqAsKHZjXfEB7WWPrWljBWI4AFJhu4VES4w5UxHZCCQ eWlM9XvZyTjpkRbGGGZ0plB/N7q8q5jaTpVk8dpgYpoOdhUWli5cIDaEgFkBDUoUcYZoZV mds9aMP5+whLl9ktPQDB2u9U7bwjsrA= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) (Using TLS) by relay.mimecast.com with ESMTP id us-mta-57-GJ2V3kJMNZOg9DuCyXGLxQ-1; Tue, 26 Jan 2021 06:53:46 -0500 X-MC-Unique: GJ2V3kJMNZOg9DuCyXGLxQ-1 Received: from smtp.corp.redhat.com (int-mx07.intmail.prod.int.phx2.redhat.com [10.5.11.22]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id A71C5180A096; Tue, 26 Jan 2021 11:53:44 +0000 (UTC) Received: from localhost.localdomain.com (ovpn-12-72.pek2.redhat.com [10.72.12.72]) by smtp.corp.redhat.com (Postfix) with ESMTP id 7095710016F7; Tue, 26 Jan 2021 11:53:40 +0000 (UTC) From: Lianbo Jiang To: linux-kernel@vger.kernel.org Cc: joro@8bytes.org, will@kernel.org, iommu@lists.linux-foundation.org, jsnitsel@redhat.com, thomas.lendacky@amd.com, robin.murphy@arm.com, bhe@redhat.com, hch@infradead.org, baolu.lu@linux.intel.com Subject: [PATCH v3 0/2] iommu: fix the failure of deferred attach for iommu attach device Date: Tue, 26 Jan 2021 19:53:35 +0800 Message-Id: <20210126115337.20068-1-lijiang@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patchset is to fix the failure of deferred attach for iommu attach device, it includes the following two patches: [1] [PATCH 1/2] dma-iommu: use static-key to minimize the impact in the fast-path This is a prepared patch for the second one, move out the is_kdump_kernel() check from iommu_dma_deferred_attach() to iommu_dma_init(), and use the static-key in the fast-path to minimize the impact in the normal case. [2] [PATCH 2/2] iommu: use the __iommu_attach_device() directly for deferred attach Move the handling currently in iommu_dma_deferred_attach() into the iommu core code so that it can call the __iommu_attach_device() directly instead of the iommu_attach_device(). The external interface iommu_attach_device() is not suitable for handling this situation. Changes since v1: [1] use the __iommu_attach_device() directly for deferred attach [2] use static-key to minimize the impact in the fast-path Changes since v2: [1] remove the underscores for the variable "__deferred_attach", and change its name to iommu_deferred_attach_enabled [Suggested by Christoph Hellwig] [2] remove the "do_" from the iommu_do_deferred_attach(), and change its name to iommu_deferred_attach() [3] remove the "extern" from the definition of iommu_deferred_attach() in include/linux/iommu.h Lianbo Jiang (2): dma-iommu: use static-key to minimize the impact in the fast-path iommu: use the __iommu_attach_device() directly for deferred attach drivers/iommu/dma-iommu.c | 29 +++++++++++------------------ drivers/iommu/iommu.c | 10 ++++++++++ include/linux/iommu.h | 1 + 3 files changed, 22 insertions(+), 18 deletions(-) -- 2.17.1