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[23.128.96.18]) by mx.google.com with ESMTP id b5si6987071edz.386.2020.06.19.21.26.39; Fri, 19 Jun 2020 21:27:01 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@oracle.com header.s=corp-2020-01-29 header.b=QJt1iKuz; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=oracle.com Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2436678AbgFSSl6 (ORCPT + 99 others); Fri, 19 Jun 2020 14:41:58 -0400 Received: from userp2130.oracle.com ([156.151.31.86]:52110 "EHLO userp2130.oracle.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732225AbgFSSl6 (ORCPT ); Fri, 19 Jun 2020 14:41:58 -0400 Received: from pps.filterd (userp2130.oracle.com [127.0.0.1]) by userp2130.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 05JIWdFx070739; Fri, 19 Jun 2020 18:41:56 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=oracle.com; h=from : to : subject : date : message-id; s=corp-2020-01-29; bh=41SJszYT73pPwR3/1I12iphb74gh+cbWYaqqArUgJ2c=; b=QJt1iKuzgVYYKvCFAWAf602XaEeVmcJ8kxsHxezNBc3JjdR+VxgQbcmgrw+yjknqrP7f tDgZC68lu6QmwJPRweNhJw/tKd8FQZRvYOtHoGDuayBCwH5G4h6okAohjXFpb3Gt1eAe XHDWkBDjcp2VGnj0gKRf+VV083NkYq1g9YDCHL44dPdOoSTAr1HVvgFKwmgzprYO1jFT L0JM6jLzKjlVa0pMn9x4gMqPRUADp48fCxBWajOhDRC8rW5Z6tJ0tvj2C/aQxVMLdVWp 91QMwT8t6C5o9tN7pjDUI0dx6W6kPAUy/KVqTT2jYLPpIaT8xlnXkHoxU1iUKYCqTaIC qw== Received: from userp3020.oracle.com (userp3020.oracle.com [156.151.31.79]) by userp2130.oracle.com with ESMTP id 31q66087sc-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 19 Jun 2020 18:41:56 +0000 Received: from pps.filterd (userp3020.oracle.com [127.0.0.1]) by userp3020.oracle.com (8.16.0.42/8.16.0.42) with SMTP id 05JIXrrG074615; Fri, 19 Jun 2020 18:41:56 GMT Received: from userv0122.oracle.com (userv0122.oracle.com [156.151.31.75]) by userp3020.oracle.com with ESMTP id 31q6635620-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Fri, 19 Jun 2020 18:41:56 +0000 Received: from abhmp0015.oracle.com (abhmp0015.oracle.com [141.146.116.21]) by userv0122.oracle.com (8.14.4/8.14.4) with ESMTP id 05JIftvS003532; Fri, 19 Jun 2020 18:41:55 GMT Received: from ca-dev-arm29.us.oracle.com (/10.129.136.23) by default (Oracle Beehive Gateway v4.0) with ESMTP ; Fri, 19 Jun 2020 11:41:55 -0700 From: Henry Willard To: , , , Subject: [PATCH] scsi: target: tcmu: Call flush_dcache_page() with proper page struct Date: Fri, 19 Jun 2020 11:41:45 -0700 Message-Id: <1592592105-11497-1-git-send-email-henry.willard@oracle.com> X-Mailer: git-send-email 1.8.3.1 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9657 signatures=668680 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 mlxlogscore=999 spamscore=0 phishscore=0 bulkscore=0 malwarescore=0 mlxscore=0 adultscore=0 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006190135 X-Proofpoint-Virus-Version: vendor=nai engine=6000 definitions=9657 signatures=668680 X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 lowpriorityscore=0 malwarescore=0 bulkscore=0 phishscore=0 adultscore=0 priorityscore=1501 mlxscore=0 spamscore=0 clxscore=1011 mlxlogscore=999 suspectscore=0 impostorscore=0 cotscore=-2147483648 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006190135 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org tcmu_flush_dcache_range() gets called with addresses from both kernel linear space and vmalloc space, so virt_to_page() or vmalloc_to_page() have to be used as appropriate to get the proper page struct. On x86_64 flush_dcache_page() is the default noop implementation, so this hasn't been a problem there. When tcmu_flush_dcache_range() is called with a vmalloc address on Arm64, the result is a kernel panic with the following stack trace: [ 448.873342] CPU: 0 PID: 34102 Comm: iscsi_trx Kdump: loaded Not tainted 5.4.17-2011.3.2.1.el8uek.aarch64 #2 [ 448.876144] Hardware name: QEMU KVM Virtual Machine, BIOS 0.0.0 02/06/2015 [ 448.878377] pstate: 80400005 (Nzcv daif +PAN -UAO) [ 448.880182] pc : flush_dcache_page+0x18/0x60 [ 448.881888] lr : is_ring_space_avail+0x74/0x390 [target_core_user] [ 448.883969] sp : ffff80001720fa70 [ 448.885450] x29: ffff80001720fa70 x28: 0000000000000000 [ 448.887348] x27: 0000000000010000 x26: ffff0003c4b88000 [ 448.889285] x25: 0000000000010000 x24: ffff800017da0000 [ 448.891166] x23: ffffffdfffe00000 x22: 0000000000000078 [ 448.893061] x21: 0000800017da0001 x20: 000000000000ffff [ 448.894931] x19: ffffffffffe5f680 x18: 0000000000000000 [ 448.896826] x17: 0000000000000000 x16: 0000000000000000 [ 448.898704] x15: 0000000000000000 x14: 0000000000000000 [ 448.900562] x13: 0000000000000000 x12: 0000000000000000 [ 448.902403] x11: ffff0003d188e4d0 x10: 0000000000000030 [ 448.904230] x9 : 0000000000000000 x8 : ffff0003d4073f00 [ 448.906094] x7 : 00000000000013b0 x6 : 000000000000003f [ 448.907911] x5 : 0000000000000040 x4 : ffff0003d16d6258 [ 448.909720] x3 : 0000000000010000 x2 : 0000000000000078 [ 448.911664] x1 : ffff0003d16d6228 x0 : ffff800009f43b1c [ 448.913767] Call trace: [ 448.914984] flush_dcache_page+0x18/0x60 [ 448.916518] is_ring_space_avail+0x74/0x390 [target_core_user] [ 448.918450] queue_cmd_ring+0x228/0x700 [target_core_user] [ 448.920318] tcmu_queue_cmd+0xd8/0x14c [target_core_user] [ 448.922192] __target_execute_cmd+0x30/0x130 [target_core_mod] [ 448.924170] target_execute_cmd+0x1a4/0x450 [target_core_mod] [ 448.926212] transport_generic_new_cmd+0x1b8/0x3a0 [target_core_mod] [ 448.928289] transport_handle_cdb_direct+0x50/0xb0 [target_core_mod] [ 448.930368] iscsit_execute_cmd+0x2c0/0x360 [iscsi_target_mod] [ 448.932347] iscsit_sequence_cmd+0xd8/0x1c8 [iscsi_target_mod] [ 448.934313] iscsit_process_scsi_cmd+0xac/0xf8 [iscsi_target_mod] [ 448.936479] iscsit_get_rx_pdu+0x450/0xd68 [iscsi_target_mod] [ 448.938423] iscsi_target_rx_thread+0xc0/0x168 [iscsi_target_mod] [ 448.940387] kthread+0x110/0x114 [ 448.941802] ret_from_fork+0x10/0x18 [ 448.943271] Code: f9000bf3 aa0003f3 aa1e03e0 d503201f (f9400260) [ 448.945271] SMP: stopping secondary CPUs Signed-off-by: Henry Willard --- drivers/target/target_core_user.c | 10 +++++++++- 1 file changed, 9 insertions(+), 1 deletion(-) diff --git a/drivers/target/target_core_user.c b/drivers/target/target_core_user.c index 560bfec933bc..7557c0630483 100644 --- a/drivers/target/target_core_user.c +++ b/drivers/target/target_core_user.c @@ -597,11 +597,19 @@ static inline void tcmu_flush_dcache_range(void *vaddr, size_t size) { unsigned long offset = offset_in_page(vaddr); void *start = vaddr - offset; + struct page *pg; size = round_up(size+offset, PAGE_SIZE); while (size) { - flush_dcache_page(virt_to_page(start)); + if (virt_addr_valid(start)) + pg = virt_to_page(start); + else if (is_vmalloc_addr(start)) + pg = vmalloc_to_page(start); + else + break; + + flush_dcache_page(pg); start += PAGE_SIZE; size -= PAGE_SIZE; } -- 1.8.3.1