From patchwork Wed Jun 15 14:58:49 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: John Crispin X-Patchwork-Id: 9178731 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 20CC2608A2 for ; Wed, 15 Jun 2016 14:59:49 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 0CC8427DA4 for ; Wed, 15 Jun 2016 14:59:49 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 019EF2818B; Wed, 15 Jun 2016 14:59:48 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-4.2 required=2.0 tests=BAYES_00, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.9]) (using TLSv1.2 with cipher AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 65A3B27F54 for ; Wed, 15 Jun 2016 14:59:47 +0000 (UTC) Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.80.1 #2 (Red Hat Linux)) id 1bDCIE-0000Ux-Gg; Wed, 15 Jun 2016 14:59:46 +0000 Received: from nbd.name ([2a01:4f8:131:30e2::2]) by bombadil.infradead.org with esmtps (Exim 4.80.1 #2 (Red Hat Linux)) id 1bDCIB-0000JF-MB for linux-mediatek@lists.infradead.org; Wed, 15 Jun 2016 14:59:44 +0000 From: John Crispin To: "David S. Miller" Subject: [PATCH 3/4] net-next: mediatek: add IRQ locking Date: Wed, 15 Jun 2016 16:58:49 +0200 Message-Id: <1466002730-58476-4-git-send-email-john@phrozen.org> X-Mailer: git-send-email 1.7.10.4 In-Reply-To: <1466002730-58476-1-git-send-email-john@phrozen.org> References: <1466002730-58476-1-git-send-email-john@phrozen.org> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20160615_075943_950354_63103CD0 X-CRM114-Status: UNSURE ( 7.43 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.20 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sean Wang , netdev@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, John Crispin , Felix Fietkau MIME-Version: 1.0 Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+patchwork-linux-mediatek=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP The code that enables and disables IRQs is missing proper locking. After adding the IRQ grouping patch and routing the RX and TX IRQs to different cores we experienced IRQ stalls. Fix this by adding proper locking. We use a dedicated lock to reduce the latency if the IRQ code. Signed-off-by: John Crispin --- drivers/net/ethernet/mediatek/mtk_eth_soc.c | 7 +++++++ drivers/net/ethernet/mediatek/mtk_eth_soc.h | 1 + 2 files changed, 8 insertions(+) diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.c b/drivers/net/ethernet/mediatek/mtk_eth_soc.c index cc38eae..c7da00b 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.c +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.c @@ -300,18 +300,24 @@ static void mtk_mdio_cleanup(struct mtk_eth *eth) static inline void mtk_irq_disable(struct mtk_eth *eth, u32 mask) { + unsigned long flags; u32 val; + spin_lock_irqsave(ð->irq_lock, flags); val = mtk_r32(eth, MTK_QDMA_INT_MASK); mtk_w32(eth, val & ~mask, MTK_QDMA_INT_MASK); + spin_unlock_irqrestore(ð->irq_lock, flags); } static inline void mtk_irq_enable(struct mtk_eth *eth, u32 mask) { + unsigned long flags; u32 val; + spin_lock_irqsave(ð->irq_lock, flags); val = mtk_r32(eth, MTK_QDMA_INT_MASK); mtk_w32(eth, val | mask, MTK_QDMA_INT_MASK); + spin_unlock_irqrestore(ð->irq_lock, flags); } static int mtk_set_mac_address(struct net_device *dev, void *p) @@ -1739,6 +1745,7 @@ static int mtk_probe(struct platform_device *pdev) return PTR_ERR(eth->base); spin_lock_init(ð->page_lock); + spin_lock_init(ð->irq_lock); eth->ethsys = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "mediatek,ethsys"); diff --git a/drivers/net/ethernet/mediatek/mtk_eth_soc.h b/drivers/net/ethernet/mediatek/mtk_eth_soc.h index a5eb7c6..3159d2a 100644 --- a/drivers/net/ethernet/mediatek/mtk_eth_soc.h +++ b/drivers/net/ethernet/mediatek/mtk_eth_soc.h @@ -373,6 +373,7 @@ struct mtk_eth { void __iomem *base; struct reset_control *rstc; spinlock_t page_lock; + spinlock_t irq_lock; struct net_device dummy_dev; struct net_device *netdev[MTK_MAX_DEVS]; struct mtk_mac *mac[MTK_MAX_DEVS];