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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT 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 D9DFAC433E0 for ; Tue, 7 Jul 2020 13:15:59 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id B46A220771 for ; Tue, 7 Jul 2020 13:15:59 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594127759; bh=MaphCiqMCAcv/7HIRD7elKhsP5r80jyqeJ2IlQWWTYQ=; h=From:To:Cc:Subject:Date:List-ID:From; b=MEnyN6VyVClp8HpmFeHpP0iC1fPcoac3CSHEDYOaDAcu8CtOHjYz2oDoBQ+LRQv19 esizDCOEs61V2UvdK5fPGZL62yOJMgfU+iwJCbQRHhhVwf2qjiKOOh8d+4toJTy9+Y u1u0/Omn2RGYTfz09ub1GUXUdAh2w7FWyFq2vV0k= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727064AbgGGNP7 (ORCPT ); Tue, 7 Jul 2020 09:15:59 -0400 Received: from mail.kernel.org ([198.145.29.99]:49770 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725944AbgGGNP6 (ORCPT ); Tue, 7 Jul 2020 09:15:58 -0400 Received: from localhost (unknown [213.57.247.131]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 640742075B; Tue, 7 Jul 2020 13:15:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594127758; bh=MaphCiqMCAcv/7HIRD7elKhsP5r80jyqeJ2IlQWWTYQ=; h=From:To:Cc:Subject:Date:From; b=eKJ1KBo9rcnB7ZHCv/YbR7F2zJoeGIxXC74OHL/aQy/qQgWmdPvEucoHCv+GRaboT iaRo8F88VyQYdL1w2Twl4kzL2Aovfr2TSyJLy3O5R65wAzd/JsCgQbd/82xoXM5QiN lb+71WRbqtsIlNatLLbZrh3iYAtjzxm06f0jLaFw= From: Leon Romanovsky To: Doug Ledford , Jason Gunthorpe Cc: Maor Gottlieb , linux-rdma@vger.kernel.org, Matthew Wilcox Subject: [PATCH rdma-rc v1] RDMA/mlx5: Use xa_lock_irq when access to SRQ table Date: Tue, 7 Jul 2020 16:15:51 +0300 Message-Id: <20200707131551.1153207-1-leon@kernel.org> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-rdma-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-rdma@vger.kernel.org From: Maor Gottlieb SRQ table is accessed both from interrupt and process context, therefore we must use xa_lock_irq. [ 9878.321379] -------------------------------- [ 9878.322349] inconsistent {IN-HARDIRQ-W} -> {HARDIRQ-ON-W} usage. [ 9878.323667] kworker/u17:9/8573 [HC0[0]:SC0[0]:HE1:SE1] takes: [ 9878.324894] ffff8883e3503d30 (&xa->xa_lock#13){?...}-{2:2}, at: mlx5_cmd_get_srq+0x18/0x70 [mlx5_ib] [ 9878.326816] {IN-HARDIRQ-W} state was registered at: [ 9878.327905] lock_acquire+0xb9/0x3a0 [ 9878.328720] _raw_spin_lock+0x25/0x30 [ 9878.329475] srq_event_notifier+0x2b/0xc0 [mlx5_ib] [ 9878.330433] notifier_call_chain+0x45/0x70 [ 9878.331393] __atomic_notifier_call_chain+0x69/0x100 [ 9878.332530] forward_event+0x36/0xc0 [mlx5_core] [ 9878.333558] notifier_call_chain+0x45/0x70 [ 9878.334418] __atomic_notifier_call_chain+0x69/0x100 [ 9878.335498] mlx5_eq_async_int+0xc5/0x160 [mlx5_core] [ 9878.336543] notifier_call_chain+0x45/0x70 [ 9878.337354] __atomic_notifier_call_chain+0x69/0x100 [ 9878.338337] mlx5_irq_int_handler+0x19/0x30 [mlx5_core] [ 9878.339369] __handle_irq_event_percpu+0x43/0x2a0 [ 9878.340382] handle_irq_event_percpu+0x30/0x70 [ 9878.341252] handle_irq_event+0x34/0x60 [ 9878.342020] handle_edge_irq+0x7c/0x1b0 [ 9878.342788] do_IRQ+0x60/0x110 [ 9878.343482] ret_from_intr+0x0/0x2a [ 9878.344251] default_idle+0x34/0x160 [ 9878.344996] do_idle+0x1ec/0x220 [ 9878.345682] cpu_startup_entry+0x19/0x20 [ 9878.346511] start_secondary+0x153/0x1a0 [ 9878.347328] secondary_startup_64+0xa4/0xb0 [ 9878.348226] irq event stamp: 20907 [ 9878.348953] hardirqs last enabled at (20907): [] _raw_spin_unlock_irq+0x24/0x30 [ 9878.350599] hardirqs last disabled at (20906): [] _raw_spin_lock_irq+0xf/0x40 [ 9878.352300] softirqs last enabled at (20746): [] __do_softirq+0x2c9/0x436 [ 9878.353859] softirqs last disabled at (20681): [] irq_exit+0xb3/0xc0 [ 9878.355365] [ 9878.355365] other info that might help us debug this: [ 9878.356703] Possible unsafe locking scenario: [ 9878.356703] [ 9878.357941] CPU0 [ 9878.358522] ---- [ 9878.359109] lock(&xa->xa_lock#13); [ 9878.359875] [ 9878.360504] lock(&xa->xa_lock#13); [ 9878.361315] [ 9878.361315] *** DEADLOCK *** [ 9878.361315] [ 9878.362632] 2 locks held by kworker/u17:9/8573: [ 9878.374883] #0: ffff888295218d38 ((wq_completion)mlx5_ib_page_fault){+.+.}-{0:0}, at: process_one_work+0x1f1/0x5f0 [ 9878.376728] #1: ffff888401647e78 ((work_completion)(&pfault->work)){+.+.}-{0:0}, at: process_one_work+0x1f1/0x5f0 [ 9878.378550] [ 9878.378550] stack backtrace: [ 9878.379489] CPU: 0 PID: 8573 Comm: kworker/u17:9 Tainted: G O 5.7.0_for_upstream_min_debug_2020_06_14_11_31_46_41 #1 [ 9878.381730] Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.12.1-0-ga5cab58e9a3f-prebuilt.qemu.org 04/01/2014 [ 9878.383940] Workqueue: mlx5_ib_page_fault mlx5_ib_eqe_pf_action [mlx5_ib] [ 9878.385239] Call Trace: [ 9878.385822] dump_stack+0x71/0x9b [ 9878.386519] mark_lock+0x4f2/0x590 [ 9878.387263] ? print_shortest_lock_dependencies+0x200/0x200 [ 9878.388362] __lock_acquire+0xa00/0x1eb0 [ 9878.389133] lock_acquire+0xb9/0x3a0 [ 9878.389854] ? mlx5_cmd_get_srq+0x18/0x70 [mlx5_ib] [ 9878.390796] _raw_spin_lock+0x25/0x30 [ 9878.391533] ? mlx5_cmd_get_srq+0x18/0x70 [mlx5_ib] [ 9878.392455] mlx5_cmd_get_srq+0x18/0x70 [mlx5_ib] [ 9878.393351] mlx5_ib_eqe_pf_action+0x257/0xa30 [mlx5_ib] [ 9878.394337] ? process_one_work+0x209/0x5f0 [ 9878.395150] process_one_work+0x27b/0x5f0 [ 9878.395939] ? __schedule+0x280/0x7e0 [ 9878.396683] worker_thread+0x2d/0x3c0 [ 9878.397424] ? process_one_work+0x5f0/0x5f0 [ 9878.398249] kthread+0x111/0x130 [ 9878.398926] ? kthread_park+0x90/0x90 [ 9878.399709] ret_from_fork+0x24/0x30 Fixes: b02a29eb8841 ("mlx5: Convert mlx5_srq_table to XArray") Signed-off-by: Maor Gottlieb Signed-off-by: Leon Romanovsky --- Changelog: v1: * I left Fixes as before to make sure that it is taken properly to stable@. * xa_lock_irqsave -> xa_lock_irq v0: https://lore.kernel.org/linux-rdma/20200707110612.882962-2-leon@kernel.org --- drivers/infiniband/hw/mlx5/srq_cmd.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/infiniband/hw/mlx5/srq_cmd.c b/drivers/infiniband/hw/mlx5/srq_cmd.c index 6f5eadc4d183..11699c1f7ba0 100644 --- a/drivers/infiniband/hw/mlx5/srq_cmd.c +++ b/drivers/infiniband/hw/mlx5/srq_cmd.c @@ -83,11 +83,11 @@ struct mlx5_core_srq *mlx5_cmd_get_srq(struct mlx5_ib_dev *dev, u32 srqn) struct mlx5_srq_table *table = &dev->srq_table; struct mlx5_core_srq *srq; - xa_lock(&table->array); + xa_lock_irq(&table->array); srq = xa_load(&table->array, srqn); if (srq) refcount_inc(&srq->common.refcount); - xa_unlock(&table->array); + xa_unlock_irq(&table->array); return srq; } @@ -655,11 +655,11 @@ static int srq_event_notifier(struct notifier_block *nb, eqe = data; srqn = be32_to_cpu(eqe->data.qp_srq.qp_srq_n) & 0xffffff; - xa_lock(&table->array); + xa_lock_irq(&table->array); srq = xa_load(&table->array, srqn); if (srq) refcount_inc(&srq->common.refcount); - xa_unlock(&table->array); + xa_unlock_irq(&table->array); if (!srq) return NOTIFY_OK; -- 2.26.2