From patchwork Fri Mar 20 19:42:40 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Grygorii Strashko X-Patchwork-Id: 211542 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=-9.9 required=3.0 tests=DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=unavailable 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 5DC9EC4332E for ; Fri, 20 Mar 2020 19:43:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 2C7B620787 for ; Fri, 20 Mar 2020 19:43:42 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (1024-bit key) header.d=ti.com header.i=@ti.com header.b="sIfUJA5S" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727345AbgCTTnh (ORCPT ); Fri, 20 Mar 2020 15:43:37 -0400 Received: from lelv0143.ext.ti.com ([198.47.23.248]:44740 "EHLO lelv0143.ext.ti.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726738AbgCTTng (ORCPT ); Fri, 20 Mar 2020 15:43:36 -0400 Received: from lelv0265.itg.ti.com ([10.180.67.224]) by lelv0143.ext.ti.com (8.15.2/8.15.2) with ESMTP id 02KJhWjT018628; Fri, 20 Mar 2020 14:43:32 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ti.com; s=ti-com-17Q1; t=1584733412; bh=BDh7JDA1u67mI0bzRlP2YIugwKL6tYVjHl2OGCvCnQg=; h=From:To:CC:Subject:Date:In-Reply-To:References; b=sIfUJA5SYpQnO7hOqr/NZCNRsJMhS7qf61RA/lx6dBfomdhcGr9pq9yUfqfBsPk8B VVqfMsIF9xQH2zcAb1EEiTTGXTpTC/laERuzICWZomAA+2nja1AZQc8HNgnZokZUDS EL89nv9jWX9kL4R2lV66eV87bGnaE91IXnq83V4I= Received: from DLEE112.ent.ti.com (dlee112.ent.ti.com [157.170.170.23]) by lelv0265.itg.ti.com (8.15.2/8.15.2) with ESMTPS id 02KJhWRA018988 (version=TLSv1.2 cipher=AES256-GCM-SHA384 bits=256 verify=FAIL); Fri, 20 Mar 2020 14:43:32 -0500 Received: from DLEE107.ent.ti.com (157.170.170.37) by DLEE112.ent.ti.com (157.170.170.23) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1847.3; Fri, 20 Mar 2020 14:43:32 -0500 Received: from lelv0326.itg.ti.com (10.180.67.84) by DLEE107.ent.ti.com (157.170.170.37) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256_P256) id 15.1.1847.3 via Frontend Transport; Fri, 20 Mar 2020 14:43:32 -0500 Received: from localhost (ileax41-snat.itg.ti.com [10.172.224.153]) by lelv0326.itg.ti.com (8.15.2/8.15.2) with ESMTP id 02KJhVMH099429; Fri, 20 Mar 2020 14:43:31 -0500 From: Grygorii Strashko To: "David S . Miller" , Richard Cochran , Lokesh Vutla , Tony Lindgren CC: Sekhar Nori , Murali Karicheri , netdev , , , Grygorii Strashko Subject: [PATCH net-next v3 07/11] net: ethernet: ti: cpts: rework locking Date: Fri, 20 Mar 2020 21:42:40 +0200 Message-ID: <20200320194244.4703-8-grygorii.strashko@ti.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200320194244.4703-1-grygorii.strashko@ti.com> References: <20200320194244.4703-1-grygorii.strashko@ti.com> MIME-Version: 1.0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 Sender: linux-omap-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-omap@vger.kernel.org Now spinlock is used to synchronize everything which is not required. Add mutex and use to sync access to PTP interface and PTP worker and use spinlock only to sync FIFO/events processing. Signed-off-by: Grygorii Strashko --- drivers/net/ethernet/ti/cpts.c | 53 +++++++++++++++++++--------------- drivers/net/ethernet/ti/cpts.h | 3 +- 2 files changed, 32 insertions(+), 24 deletions(-) diff --git a/drivers/net/ethernet/ti/cpts.c b/drivers/net/ethernet/ti/cpts.c index 10061e17d7b4..3cfa0f78287b 100644 --- a/drivers/net/ethernet/ti/cpts.c +++ b/drivers/net/ethernet/ti/cpts.c @@ -99,9 +99,12 @@ static void cpts_purge_txq(struct cpts *cpts) */ static int cpts_fifo_read(struct cpts *cpts, int match) { + struct cpts_event *event; + unsigned long flags; int i, type = -1; u32 hi, lo; - struct cpts_event *event; + + spin_lock_irqsave(&cpts->lock, flags); for (i = 0; i < CPTS_FIFO_DEPTH; i++) { if (cpts_fifo_pop(cpts, &hi, &lo)) @@ -109,7 +112,7 @@ static int cpts_fifo_read(struct cpts *cpts, int match) if (list_empty(&cpts->pool) && cpts_purge_events(cpts)) { dev_info(cpts->dev, "cpts: event pool empty\n"); - return -1; + break; } event = list_first_entry(&cpts->pool, struct cpts_event, list); @@ -148,6 +151,9 @@ static int cpts_fifo_read(struct cpts *cpts, int match) if (type == match) break; } + + spin_unlock_irqrestore(&cpts->lock, flags); + return type == match ? 0 : -1; } @@ -161,10 +167,15 @@ static u64 cpts_systim_read(const struct cyclecounter *cc) static void cpts_update_cur_time(struct cpts *cpts, int match, struct ptp_system_timestamp *sts) { + unsigned long flags; + + /* use spin_lock_irqsave() here as it has to run very fast */ + spin_lock_irqsave(&cpts->lock, flags); ptp_read_system_prets(sts); cpts_write32(cpts, TS_PUSH, ts_push); cpts_read32(cpts, ts_push); ptp_read_system_postts(sts); + spin_unlock_irqrestore(&cpts->lock, flags); if (cpts_fifo_read(cpts, match) && match != -1) dev_err(cpts->dev, "cpts: unable to obtain a time stamp\n"); @@ -174,11 +185,10 @@ static void cpts_update_cur_time(struct cpts *cpts, int match, static int cpts_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb) { - u64 adj; - u32 diff, mult; - int neg_adj = 0; - unsigned long flags; struct cpts *cpts = container_of(ptp, struct cpts, info); + int neg_adj = 0; + u32 diff, mult; + u64 adj; if (ppb < 0) { neg_adj = 1; @@ -189,25 +199,23 @@ static int cpts_ptp_adjfreq(struct ptp_clock_info *ptp, s32 ppb) adj *= ppb; diff = div_u64(adj, 1000000000ULL); - spin_lock_irqsave(&cpts->lock, flags); + mutex_lock(&cpts->ptp_clk_mutex); cpts->mult_new = neg_adj ? mult - diff : mult + diff; cpts_update_cur_time(cpts, CPTS_EV_PUSH, NULL); - spin_unlock_irqrestore(&cpts->lock, flags); - + mutex_unlock(&cpts->ptp_clk_mutex); return 0; } static int cpts_ptp_adjtime(struct ptp_clock_info *ptp, s64 delta) { - unsigned long flags; struct cpts *cpts = container_of(ptp, struct cpts, info); - spin_lock_irqsave(&cpts->lock, flags); + mutex_lock(&cpts->ptp_clk_mutex); timecounter_adjtime(&cpts->tc, delta); - spin_unlock_irqrestore(&cpts->lock, flags); + mutex_unlock(&cpts->ptp_clk_mutex); return 0; } @@ -217,15 +225,14 @@ static int cpts_ptp_gettimeex(struct ptp_clock_info *ptp, struct ptp_system_timestamp *sts) { struct cpts *cpts = container_of(ptp, struct cpts, info); - unsigned long flags; u64 ns; - spin_lock_irqsave(&cpts->lock, flags); + mutex_lock(&cpts->ptp_clk_mutex); cpts_update_cur_time(cpts, CPTS_EV_PUSH, sts); ns = timecounter_read(&cpts->tc); - spin_unlock_irqrestore(&cpts->lock, flags); + mutex_unlock(&cpts->ptp_clk_mutex); *ts = ns_to_timespec64(ns); @@ -235,15 +242,14 @@ static int cpts_ptp_gettimeex(struct ptp_clock_info *ptp, static int cpts_ptp_settime(struct ptp_clock_info *ptp, const struct timespec64 *ts) { - u64 ns; - unsigned long flags; struct cpts *cpts = container_of(ptp, struct cpts, info); + u64 ns; ns = timespec64_to_ns(ts); - spin_lock_irqsave(&cpts->lock, flags); + mutex_lock(&cpts->ptp_clk_mutex); timecounter_init(&cpts->tc, &cpts->cc, ns); - spin_unlock_irqrestore(&cpts->lock, flags); + mutex_unlock(&cpts->ptp_clk_mutex); return 0; } @@ -339,10 +345,9 @@ static long cpts_overflow_check(struct ptp_clock_info *ptp) unsigned long flags; u64 ns; - spin_lock_irqsave(&cpts->lock, flags); - cpts_update_cur_time(cpts, -1, NULL); - spin_unlock_irqrestore(&cpts->lock, flags); + mutex_lock(&cpts->ptp_clk_mutex); + cpts_update_cur_time(cpts, -1, NULL); ns = timecounter_read(&cpts->tc); cpts_process_events(cpts); @@ -356,6 +361,7 @@ static long cpts_overflow_check(struct ptp_clock_info *ptp) spin_unlock_irqrestore(&cpts->txq.lock, flags); dev_dbg(cpts->dev, "cpts overflow check at %lld\n", ns); + mutex_unlock(&cpts->ptp_clk_mutex); return (long)delay; } @@ -425,8 +431,8 @@ static u64 cpts_find_ts(struct cpts *cpts, struct sk_buff *skb, u32 mtype_seqid; u64 ns = 0; - spin_lock_irqsave(&cpts->lock, flags); cpts_fifo_read(cpts, -1); + spin_lock_irqsave(&cpts->lock, flags); list_for_each_safe(this, next, &cpts->events) { event = list_entry(this, struct cpts_event, list); if (event_expired(event)) { @@ -703,6 +709,7 @@ struct cpts *cpts_create(struct device *dev, void __iomem *regs, cpts->dev = dev; cpts->reg = (struct cpsw_cpts __iomem *)regs; spin_lock_init(&cpts->lock); + mutex_init(&cpts->ptp_clk_mutex); ret = cpts_of_parse(cpts, node); if (ret) diff --git a/drivers/net/ethernet/ti/cpts.h b/drivers/net/ethernet/ti/cpts.h index 421630049ee7..f16e14d67f5f 100644 --- a/drivers/net/ethernet/ti/cpts.h +++ b/drivers/net/ethernet/ti/cpts.h @@ -104,7 +104,7 @@ struct cpts { int rx_enable; struct ptp_clock_info info; struct ptp_clock *clock; - spinlock_t lock; /* protects time registers */ + spinlock_t lock; /* protects fifo/events */ u32 cc_mult; /* for the nominal frequency */ struct cyclecounter cc; struct timecounter tc; @@ -117,6 +117,7 @@ struct cpts { struct sk_buff_head txq; u64 cur_timestamp; u32 mult_new; + struct mutex ptp_clk_mutex; /* sync PTP interface and worker */ }; void cpts_rx_timestamp(struct cpts *cpts, struct sk_buff *skb);