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=-20.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 CCEE6C11F92 for ; Tue, 6 Jul 2021 11:39:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id BAF2C61DEB for ; Tue, 6 Jul 2021 11:39:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S239180AbhGFLkg (ORCPT ); Tue, 6 Jul 2021 07:40:36 -0400 Received: from mail.kernel.org ([198.145.29.99]:35650 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235018AbhGFL3d (ORCPT ); Tue, 6 Jul 2021 07:29:33 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 982A961CCA; Tue, 6 Jul 2021 11:20:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1625570433; bh=RDbpPRpPUHIEKUJqvm9HdxzVT2iLNoTodQeRLLStWfI=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FwCJoJwgKpAbgiPuLR6XOYx1OLSRtWb0cwfBl9WXg21RsQ5tTj+HnP8E7Rswv+bE7 aLSdR+D3jnPt/txusR/KfWYj1oq1HOvqRL8X738WnS1O/yMma8hwVx7eQeLnZ1qdiX DmxaEjSAZ+A+PRBSKfwXuP3zw05J3q209AYB+avV/YYGWdAZrhrpukhki6QsSIMRwb pdzGPPVzAyrDaJTs+AepBXl8sv6KEQlFrz5qgFzqmzF5xR8RKmWMtYF+JSnMEcifkH sNv7R485YZ6AMrEMaBQmtNaP/t7rRdvLQfDCajw9kcbTs3AjymOZtKZMM174TKQ+gO Zk/FVbHnJl39w== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Jonathan Kim , Felix Kuehling , Alex Deucher , Sasha Levin , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org Subject: [PATCH AUTOSEL 5.12 095/160] drm/amdkfd: fix circular locking on get_wave_state Date: Tue, 6 Jul 2021 07:17:21 -0400 Message-Id: <20210706111827.2060499-95-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210706111827.2060499-1-sashal@kernel.org> References: <20210706111827.2060499-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jonathan Kim [ Upstream commit 63f6e01237257e7226efc5087f3f0b525d320f54 ] get_wave_state acquires the mmap_lock on copy_to_user but so do mmu_notifiers. mmu_notifiers allows dqm locking so do get_wave_state outside the dqm_lock to prevent circular locking. v2: squash in unused variable removal. Signed-off-by: Jonathan Kim Reviewed-by: Felix Kuehling Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- .../drm/amd/amdkfd/kfd_device_queue_manager.c | 28 +++++++++---------- 1 file changed, 13 insertions(+), 15 deletions(-) diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c index a4266c4bca13..df05eca73275 100644 --- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c +++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c @@ -1677,29 +1677,27 @@ static int get_wave_state(struct device_queue_manager *dqm, u32 *save_area_used_size) { struct mqd_manager *mqd_mgr; - int r; dqm_lock(dqm); - if (q->properties.type != KFD_QUEUE_TYPE_COMPUTE || - q->properties.is_active || !q->device->cwsr_enabled) { - r = -EINVAL; - goto dqm_unlock; - } - mqd_mgr = dqm->mqd_mgrs[KFD_MQD_TYPE_CP]; - if (!mqd_mgr->get_wave_state) { - r = -EINVAL; - goto dqm_unlock; + if (q->properties.type != KFD_QUEUE_TYPE_COMPUTE || + q->properties.is_active || !q->device->cwsr_enabled || + !mqd_mgr->get_wave_state) { + dqm_unlock(dqm); + return -EINVAL; } - r = mqd_mgr->get_wave_state(mqd_mgr, q->mqd, ctl_stack, - ctl_stack_used_size, save_area_used_size); - -dqm_unlock: dqm_unlock(dqm); - return r; + + /* + * get_wave_state is outside the dqm lock to prevent circular locking + * and the queue should be protected against destruction by the process + * lock. + */ + return mqd_mgr->get_wave_state(mqd_mgr, q->mqd, ctl_stack, + ctl_stack_used_size, save_area_used_size); } static int process_termination_cpsch(struct device_queue_manager *dqm, -- 2.30.2