Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1757017Ab3JKIuJ (ORCPT ); Fri, 11 Oct 2013 04:50:09 -0400 Received: from mail-bk0-f52.google.com ([209.85.214.52]:52185 "EHLO mail-bk0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756767Ab3JKIuE (ORCPT ); Fri, 11 Oct 2013 04:50:04 -0400 From: Matias Bjorling To: willy@linux.intel.com Cc: linux-kernel@vger.kernel.org, linux-nvme@lists.infradead.org, Matias Bjorling Subject: [PATCH 1/2] NVMe: Refactor doorbell Date: Fri, 11 Oct 2013 10:48:52 +0200 Message-Id: <1381481333-23888-2-git-send-email-m@bjorling.me> X-Mailer: git-send-email 1.8.1.2 In-Reply-To: <1381481333-23888-1-git-send-email-m@bjorling.me> References: <1381481333-23888-1-git-send-email-m@bjorling.me> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2569 Lines: 85 The doorbell code is repeated various places. Refactor it into its own function for clarity. Signed-off-by: Matias Bjorling --- drivers/block/nvme-core.c | 29 +++++++++++++---------------- 1 file changed, 13 insertions(+), 16 deletions(-) diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c index da52092..40998d5 100644 --- a/drivers/block/nvme-core.c +++ b/drivers/block/nvme-core.c @@ -242,6 +242,13 @@ void put_nvmeq(struct nvme_queue *nvmeq) put_cpu(); } +static inline void nvme_ring_doorbell(struct nvme_queue *nvmeq) +{ + if (++nvmeq->sq_tail == nvmeq->q_depth) + nvmeq->sq_tail = 0; + writel(nvmeq->sq_tail, nvmeq->q_db); +} + /** * nvme_submit_cmd() - Copy a command into a queue and ring the doorbell * @nvmeq: The queue to use @@ -252,14 +259,10 @@ void put_nvmeq(struct nvme_queue *nvmeq) static int nvme_submit_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd) { unsigned long flags; - u16 tail; + spin_lock_irqsave(&nvmeq->q_lock, flags); - tail = nvmeq->sq_tail; - memcpy(&nvmeq->sq_cmds[tail], cmd, sizeof(*cmd)); - if (++tail == nvmeq->q_depth) - tail = 0; - writel(tail, nvmeq->q_db); - nvmeq->sq_tail = tail; + memcpy(&nvmeq->sq_cmds[nvmeq->sq_tail], cmd, sizeof(*cmd)); + nvme_ring_doorbell(nvmeq); spin_unlock_irqrestore(&nvmeq->q_lock, flags); return 0; @@ -619,9 +622,7 @@ static int nvme_submit_discard(struct nvme_queue *nvmeq, struct nvme_ns *ns, cmnd->dsm.nr = 0; cmnd->dsm.attributes = cpu_to_le32(NVME_DSMGMT_AD); - if (++nvmeq->sq_tail == nvmeq->q_depth) - nvmeq->sq_tail = 0; - writel(nvmeq->sq_tail, nvmeq->q_db); + nvme_ring_doorbell(nvmeq); return 0; } @@ -636,9 +637,7 @@ static int nvme_submit_flush(struct nvme_queue *nvmeq, struct nvme_ns *ns, cmnd->common.command_id = cmdid; cmnd->common.nsid = cpu_to_le32(ns->ns_id); - if (++nvmeq->sq_tail == nvmeq->q_depth) - nvmeq->sq_tail = 0; - writel(nvmeq->sq_tail, nvmeq->q_db); + nvme_ring_doorbell(nvmeq); return 0; } @@ -729,9 +728,7 @@ static int nvme_submit_bio_queue(struct nvme_queue *nvmeq, struct nvme_ns *ns, cmnd->rw.dsmgmt = cpu_to_le32(dsmgmt); nvme_start_io_acct(bio); - if (++nvmeq->sq_tail == nvmeq->q_depth) - nvmeq->sq_tail = 0; - writel(nvmeq->sq_tail, nvmeq->q_db); + nvme_ring_doorbell(nvmeq); return 0; -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/