From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mx0a-001b2d01.pphosted.com (mx0a-001b2d01.pphosted.com [148.163.156.1]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 3tJNWR1cHGzDvsY for ; Wed, 16 Nov 2016 10:14:27 +1100 (AEDT) Received: from pps.filterd (m0098394.ppops.net [127.0.0.1]) by mx0a-001b2d01.pphosted.com (8.16.0.17/8.16.0.17) with SMTP id uAFNEGt5122699 for ; Tue, 15 Nov 2016 18:14:25 -0500 Received: from e36.co.us.ibm.com (e36.co.us.ibm.com [32.97.110.154]) by mx0a-001b2d01.pphosted.com with ESMTP id 26r77vtge5-1 (version=TLSv1.2 cipher=AES256-SHA bits=256 verify=NOT) for ; Tue, 15 Nov 2016 18:14:25 -0500 Received: from localhost by e36.co.us.ibm.com with IBM ESMTP SMTP Gateway: Authorized Use Only! Violators will be prosecuted for from ; Tue, 15 Nov 2016 16:14:24 -0700 From: Uma Krishnan To: linux-scsi@vger.kernel.org, James Bottomley , "Martin K. Petersen" , "Matthew R. Ochs" , "Manoj N. Kumar" Cc: Brian King , linuxppc-dev@lists.ozlabs.org, Ian Munsie , Andrew Donnellan , Frederic Barrat , Christophe Lombard , Uma Krishnan Subject: [PATCH 03/14] cxlflash: Improve context_reset() logic Date: Tue, 15 Nov 2016 17:14:12 -0600 In-Reply-To: <1479251530-22573-1-git-send-email-ukrishn@linux.vnet.ibm.com> References: <1479251530-22573-1-git-send-email-ukrishn@linux.vnet.ibm.com> Message-Id: <1479251652-22780-1-git-send-email-ukrishn@linux.vnet.ibm.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Currently, the context reset routine waits for command room to be available before sending the reset request. Per review of the SISLite specification and clarifications from the CXL Flash AFU designers, this wait is unnecessary. The reset request can be sent anytime regardless of command room, so long as only a single reset request is active at any one point in time. This commit simplifies the reset routine by removing the wait for command room. Additionally it adds a debug trace to help pinpoint hardware errors when a context reset does not complete. Signed-off-by: Uma Krishnan --- drivers/scsi/cxlflash/main.c | 23 +++++------------------ 1 file changed, 5 insertions(+), 18 deletions(-) diff --git a/drivers/scsi/cxlflash/main.c b/drivers/scsi/cxlflash/main.c index 6004860..6d33d8c 100644 --- a/drivers/scsi/cxlflash/main.c +++ b/drivers/scsi/cxlflash/main.c @@ -263,8 +263,9 @@ static void context_reset(struct afu_cmd *cmd) { int nretry = 0; u64 rrin = 0x1; - u64 room = 0; struct afu *afu = cmd->parent; + struct cxlflash_cfg *cfg = afu->parent; + struct device *dev = &cfg->dev->dev; ulong lock_flags; pr_debug("%s: cmd=%p\n", __func__, cmd); @@ -280,23 +281,6 @@ static void context_reset(struct afu_cmd *cmd) cmd->sa.host_use_b[0] |= (B_DONE | B_ERROR | B_TIMEOUT); spin_unlock_irqrestore(&cmd->slock, lock_flags); - /* - * We really want to send this reset at all costs, so spread - * out wait time on successive retries for available room. - */ - do { - room = readq_be(&afu->host_map->cmd_room); - atomic64_set(&afu->room, room); - if (room) - goto write_rrin; - udelay(1 << nretry); - } while (nretry++ < MC_ROOM_RETRY_CNT); - - pr_err("%s: no cmd_room to send reset\n", __func__); - return; - -write_rrin: - nretry = 0; writeq_be(rrin, &afu->host_map->ioarrin); do { rrin = readq_be(&afu->host_map->ioarrin); @@ -305,6 +289,9 @@ static void context_reset(struct afu_cmd *cmd) /* Double delay each time */ udelay(1 << nretry); } while (nretry++ < MC_ROOM_RETRY_CNT); + + dev_dbg(dev, "%s: returning rrin=0x%016llX nretry=%d\n", + __func__, rrin, nretry); } /** -- 2.1.0