From patchwork Tue Dec 3 19:30:51 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: =?utf-8?q?Thomas_Hellstr=C3=B6m_=28Intel=29?= X-Patchwork-Id: 11271833 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DC66B112B for ; Tue, 3 Dec 2019 19:40:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id B8073206DF for ; Tue, 3 Dec 2019 19:40:17 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (1024-bit key) header.d=shipmail.org header.i=@shipmail.org header.b="IWUw2wOu" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727024AbfLCTkR (ORCPT ); Tue, 3 Dec 2019 14:40:17 -0500 Received: from pio-pvt-msa3.bahnhof.se ([79.136.2.42]:32802 "EHLO pio-pvt-msa3.bahnhof.se" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726932AbfLCTkR (ORCPT ); Tue, 3 Dec 2019 14:40:17 -0500 X-Greylist: delayed 545 seconds by postgrey-1.27 at vger.kernel.org; Tue, 03 Dec 2019 14:40:16 EST Received: from localhost (localhost [127.0.0.1]) by pio-pvt-msa3.bahnhof.se (Postfix) with ESMTP id 5DA303F40C; Tue, 3 Dec 2019 20:31:10 +0100 (CET) Authentication-Results: pio-pvt-msa3.bahnhof.se; dkim=pass (1024-bit key; unprotected) header.d=shipmail.org header.i=@shipmail.org header.b=IWUw2wOu; dkim-atps=neutral X-Virus-Scanned: Debian amavisd-new at bahnhof.se X-Spam-Flag: NO X-Spam-Score: -2.099 X-Spam-Level: X-Spam-Status: No, score=-2.099 tagged_above=-999 required=6.31 tests=[BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, URIBL_BLOCKED=0.001] autolearn=ham autolearn_force=no Received: from pio-pvt-msa3.bahnhof.se ([127.0.0.1]) by localhost (pio-pvt-msa3.bahnhof.se [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id GszfSkUBF-df; Tue, 3 Dec 2019 20:31:09 +0100 (CET) Received: from mail1.shipmail.org (h-205-35.A357.priv.bahnhof.se [155.4.205.35]) (Authenticated sender: mb878879) by pio-pvt-msa3.bahnhof.se (Postfix) with ESMTPA id A4D303F32A; Tue, 3 Dec 2019 20:31:08 +0100 (CET) Received: from localhost.localdomain.localdomain (h-205-35.A357.priv.bahnhof.se [155.4.205.35]) by mail1.shipmail.org (Postfix) with ESMTPSA id 089943624F0; Tue, 3 Dec 2019 20:31:08 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=shipmail.org; s=mail; t=1575401468; bh=/7/9dHn0758DXVRpByBE3suS6EMBPMa3AZ/s9f6Z6zs=; h=From:To:Cc:Subject:Date:From; b=IWUw2wOuOW1jkYMfOxmqV6aoPv44z4kscF7BE7ZbNI56R1SMvAYnSqgW5TRZ0Gojc qyWhEmeOJp7rtRASElV/EXZiM19YU4hPwhNshv+phLOagICH6JlDrcrO3oymMLjuXL PJOpmD+Q31CMW/4/QlEEml8oQjQfKmeXrd++jprQ= From: =?utf-8?q?Thomas_Hellstr=C3=B6m_=28VMware=29?= To: linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org, pv-drivers@vmware.com Cc: Thomas Hellstrom , "James E.J. Bottomley" , "Martin K. Petersen" , Vishal Bhakta , Jim Gill Subject: [PATCH RESEND 1/2] scsi: vmw_pvscsi: Fix swiotlb operation Date: Tue, 3 Dec 2019 20:30:51 +0100 Message-Id: <20191203193052.7583-1-thomas_os@shipmail.org> X-Mailer: git-send-email 2.21.0 MIME-Version: 1.0 Sender: linux-scsi-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-scsi@vger.kernel.org From: Thomas Hellstrom With swiotlb, the first byte of the sense buffer may in some cases be uninitialized since we use DMA_FROM_DEVICE, and the device incorrectly doesn't clear it. In those cases, clear it after DMA unmapping. Cc: "James E.J. Bottomley" Cc: "Martin K. Petersen" Suggested-by: Vishal Bhakta Signed-off-by: Thomas Hellstrom Acked-by: Jim Gill --- drivers/scsi/vmw_pvscsi.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) diff --git a/drivers/scsi/vmw_pvscsi.c b/drivers/scsi/vmw_pvscsi.c index 70008816c91f..8a09d184a320 100644 --- a/drivers/scsi/vmw_pvscsi.c +++ b/drivers/scsi/vmw_pvscsi.c @@ -402,6 +402,17 @@ static int pvscsi_map_buffers(struct pvscsi_adapter *adapter, return 0; } +/* + * The device incorrectly doesn't clear the first byte of the sense + * buffer in some cases. We have to do it ourselves. + * Otherwise we run into trouble when SWIOTLB is forced. + */ +static void pvscsi_patch_sense(struct scsi_cmnd *cmd) +{ + if (cmd->sense_buffer) + cmd->sense_buffer[0] = 0; +} + static void pvscsi_unmap_buffers(const struct pvscsi_adapter *adapter, struct pvscsi_ctx *ctx) { @@ -544,6 +555,8 @@ static void pvscsi_complete_request(struct pvscsi_adapter *adapter, cmd = ctx->cmd; abort_cmp = ctx->abort_cmp; pvscsi_unmap_buffers(adapter, ctx); + if (sdstat != SAM_STAT_CHECK_CONDITION) + pvscsi_patch_sense(cmd); pvscsi_release_context(adapter, ctx); if (abort_cmp) { /* @@ -873,6 +886,7 @@ static void pvscsi_reset_all(struct pvscsi_adapter *adapter) scmd_printk(KERN_ERR, cmd, "Forced reset on cmd %p\n", cmd); pvscsi_unmap_buffers(adapter, ctx); + pvscsi_patch_sense(cmd); pvscsi_release_context(adapter, ctx); cmd->result = (DID_RESET << 16); cmd->scsi_done(cmd);