From patchwork Mon Jan 11 18:07:40 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Loic Poulain X-Patchwork-Id: 360517 Delivered-To: patch@linaro.org Received: by 2002:a17:906:4755:0:0:0:0 with SMTP id j21csp2706383ejs; Mon, 11 Jan 2021 10:00:49 -0800 (PST) X-Google-Smtp-Source: ABdhPJxzWmISvga6Zx6YEsmGoGzQEfhp7BXV5zVY/gJjpUkXNfIB7D57obDhC1rU3tEhs5eT+1vk X-Received: by 2002:a17:906:a04e:: with SMTP id bg14mr432449ejb.149.1610388049569; Mon, 11 Jan 2021 10:00:49 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1610388049; cv=none; d=google.com; s=arc-20160816; b=dhkzTU60fM8N3AS5j7ijG57m3KqTSalyhb1zcJg3zd9O4ZUdnzsvy6YSBMEU+UvgQ0 g4lZvtPOPJAO6Ak1SarnSGFXLrg9p5APSpeCOnTyJaV7ropHOJb0DDCznXWGGgXInUQ4 J8urVkImGR6FnXuJZR3aYD7hXGTHbpXjABKHybPZmaTBB1Gubl+Bfinp8fARG8o8yBSo oykZ5JDXSCltMekI/pX3gBQSuow7N6aizzEaNZ30VpDyK4XhC3mNOdKWUkqtix8mbB37 xv2A3mSv9ymmhqFWkAP4ByAH857CZO+izbb5hcCGGRlAtoq19Kx0aC/4U1xqcAKdvjUk ahrQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:message-id:date:subject:cc:to:from :dkim-signature; bh=i5vkZMIp6m8L5GT9AIEfOu/P1P8j2pgSz4aGREmv2dc=; b=bgSp1NXn3sDGF6CtmC5giS7xINCjuMTApHVnJgzqPQU9Q7HAukY/L2m4fyIVntbguK qe84noDvF343RquBESbkn5imDdAHCSuGelRrWpmx5NIaSvvswyTkHMYysUQP/84eGnxn GXHLZid5R+56uPIdoi1PVax2DVH5SArAV1/uW5s6PfWduH8tWD8lGCkV7FRWDaGuXhE6 Tz7abr0g/zKJRY26fJd7Va/s3UAmxYRMrdkbQkLU5HPvRcuKprGlGTvjIFes0em+Ste0 7Ut37ff6S9MMY67gr2WsXboSULu8vv0gGcppsrWJaPrtVMgYyqvayHwAh+eiX0GN0rQY ZRzQ== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b="I/AKHGG3"; spf=pass (google.com: domain of netdev-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=netdev-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. [23.128.96.18]) by mx.google.com with ESMTP id pw18si69209ejb.163.2021.01.11.10.00.49; Mon, 11 Jan 2021 10:00:49 -0800 (PST) Received-SPF: pass (google.com: domain of netdev-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b="I/AKHGG3"; spf=pass (google.com: domain of netdev-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=netdev-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2390088AbhAKSAs (ORCPT + 7 others); Mon, 11 Jan 2021 13:00:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54884 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389642AbhAKSAr (ORCPT ); Mon, 11 Jan 2021 13:00:47 -0500 Received: from mail-wr1-x42f.google.com (mail-wr1-x42f.google.com [IPv6:2a00:1450:4864:20::42f]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 52187C061794 for ; Mon, 11 Jan 2021 10:00:07 -0800 (PST) Received: by mail-wr1-x42f.google.com with SMTP id 91so694974wrj.7 for ; Mon, 11 Jan 2021 10:00:07 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id; bh=i5vkZMIp6m8L5GT9AIEfOu/P1P8j2pgSz4aGREmv2dc=; b=I/AKHGG3HMoRNy9lYcu3nJW8P7K50NkFE3b0sIJR4X1p8WYUTccsLtiyI0q81OljfG /Ejv1bmW1NNaPlUdEzB5SS4Xz0th4TlfipWApn2JyVw0ppDEmVpVAFyk3n3/6CjK96If cpgLvyCfMcQSGUUgQLqZKZjC00no64RfBbpdPs2Os/bNpB3M+HwF2hb6xEz/lrZQjytg Ryg5pOBQZ4cXDp2Vo7+M3qpVIO6HjpUWebrG9MR0meOhjcgFpCGB7jO+jot1bqfIgVuF ebXeYOhdRHmKN7mucpPo2msHkd95Hd38u5js9ulbMtmjSq4JgPZNE4pOu1P1LOfWXK/1 gWLQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id; bh=i5vkZMIp6m8L5GT9AIEfOu/P1P8j2pgSz4aGREmv2dc=; b=RZuFwFjmz1OYLa8ySgPiG7soiTc9ZMCLaiASVovlMZVqEZpQqekIJyLMZFdjQ9VPhC cEnk2Xg8r3rwfmqslsNFkEdqIcDLlMk0+aDwDvFeV79gHoSspbQK9aoKg8mHVfiUKrHQ XlyFK568jqHf93dOiShtwpmkdg87mhUA8fKLdHK8VrGvnH4RGWqhFzZrUCVqpn/nSrML Jo0kjikquSvT24PZ1iXYxtJkF58PAOvYa2aNADGXGffZfCtv0xXzAit61Lc+fDxc/Jyb kluhAQHyixaPbutwwAqliIqB6lYoBqh3WGeWTHuUE72hsvIJ5XdO8R0G/zYOfhnT+YGH h1Jw== X-Gm-Message-State: AOAM5339sxUuMHwlosuHXJlKYTFe7v5jtGJ9kYWeTbhd+P5A0OyEP8o3 r8kKiMwjeA0bKcW8mnkxZrLeFtFcqvkjSQ== X-Received: by 2002:adf:d085:: with SMTP id y5mr317551wrh.41.1610388006052; Mon, 11 Jan 2021 10:00:06 -0800 (PST) Received: from localhost.localdomain ([88.122.66.28]) by smtp.gmail.com with ESMTPSA id s12sm77662wmh.29.2021.01.11.10.00.05 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 11 Jan 2021 10:00:05 -0800 (PST) From: Loic Poulain To: kuba@kernel.org, davem@davemloft.net Cc: netdev@vger.kernel.org, linux-arm-msm@vger.kernel.org, manivannan.sadhasivam@linaro.org, Hemant Kumar Subject: [PATCH net-next 1/3] bus: mhi: core: Add helper API to return number of free TREs Date: Mon, 11 Jan 2021 19:07:40 +0100 Message-Id: <1610388462-16322-1-git-send-email-loic.poulain@linaro.org> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: netdev@vger.kernel.org From: Hemant Kumar Introduce mhi_get_free_desc_count() API to return number of TREs available to queue buffer. MHI clients can use this API to know before hand if ring is full without calling queue API. Signed-off-by: Hemant Kumar Reviewed-by: Jeffrey Hugo Reviewed-by: Manivannan Sadhasivam --- drivers/bus/mhi/core/main.c | 12 ++++++++++++ include/linux/mhi.h | 9 +++++++++ 2 files changed, 21 insertions(+) -- 2.7.4 diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c index 3db1108..4e31f4f 100644 --- a/drivers/bus/mhi/core/main.c +++ b/drivers/bus/mhi/core/main.c @@ -309,6 +309,18 @@ int mhi_destroy_device(struct device *dev, void *data) return 0; } +int mhi_get_free_desc_count(struct mhi_device *mhi_dev, + enum dma_data_direction dir) +{ + struct mhi_controller *mhi_cntrl = mhi_dev->mhi_cntrl; + struct mhi_chan *mhi_chan = (dir == DMA_TO_DEVICE) ? + mhi_dev->ul_chan : mhi_dev->dl_chan; + struct mhi_ring *tre_ring = &mhi_chan->tre_ring; + + return get_nr_avail_ring_elements(mhi_cntrl, tre_ring); +} +EXPORT_SYMBOL_GPL(mhi_get_free_desc_count); + void mhi_notify(struct mhi_device *mhi_dev, enum mhi_callback cb_reason) { struct mhi_driver *mhi_drv; diff --git a/include/linux/mhi.h b/include/linux/mhi.h index cd571ad..62da830 100644 --- a/include/linux/mhi.h +++ b/include/linux/mhi.h @@ -614,6 +614,15 @@ void mhi_set_mhi_state(struct mhi_controller *mhi_cntrl, void mhi_notify(struct mhi_device *mhi_dev, enum mhi_callback cb_reason); /** + * mhi_get_free_desc_count - Get transfer ring length + * Get # of TD available to queue buffers + * @mhi_dev: Device associated with the channels + * @dir: Direction of the channel + */ +int mhi_get_free_desc_count(struct mhi_device *mhi_dev, + enum dma_data_direction dir); + +/** * mhi_prepare_for_power_up - Do pre-initialization before power up. * This is optional, call this before power up if * the controller does not want bus framework to From patchwork Mon Jan 11 18:07:42 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Loic Poulain X-Patchwork-Id: 360518 Delivered-To: patch@linaro.org Received: by 2002:a17:906:4755:0:0:0:0 with SMTP id j21csp2706415ejs; Mon, 11 Jan 2021 10:00:51 -0800 (PST) X-Google-Smtp-Source: ABdhPJyE37Wt18n+ANifBQnuqNnzPwZSMtscPEU/dt7Gq0yljKga1fNIN0XVExBsarmZAEnRW5cH X-Received: by 2002:a17:906:1cd4:: with SMTP id i20mr442762ejh.415.1610388051388; Mon, 11 Jan 2021 10:00:51 -0800 (PST) ARC-Seal: i=1; a=rsa-sha256; t=1610388051; cv=none; d=google.com; s=arc-20160816; b=tj7ljIHjq/d3KPLDJ/k02vVsjwCxS8MEWHmsrFUhkrWpV2K5xwRB+crNLlQwLPEokj r16hsanjZMify6xKFsZp5+I/lwVS5hTz6pB+c/ZD/H+bxWDI/CPb8DPx3S9ev3112N2/ 0IdJc9uyscWPa4EtbvQpW8KfH7LObZgYq8BCDH7zH5/C2f4Wv8y1HNcvThHuMYemw/m4 rE9cSY2LDHVteZ5VrRTfE2bqytfoJxn8QLCAehPQvw7sGMetJlp8CkxWL1NTqUOVH7Ve JjSVHzWsKBeAla3WY1X+J8Hje95UJ31nB0WZros3hcM//g/17yezg94WBtowR/NHQ7r8 KTKQ== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=list-id:precedence:references:in-reply-to:message-id:date:subject :cc:to:from:dkim-signature; bh=o6VGoAvdQqK2Elm/WglYXBR1TIROqoxTQR1mS7lNbWE=; b=AT6tNnL4fBtpua88thbNeDoWufgSoT92q3uWiKm/f6fI7qfwv3X4yDadbfAPiJ631p ZdGmHCiwIpwyhonmTDBMo6HPmGS0l5xK5LH4DmaDZr1RYCZ+UzRU0z3MTDy0IoH6U1gz WKhjjdkPdVxodeDjAJNpSvWEqCzKGgCjKd5YNJ0JUUrwqunKPDhDCWcJVkaTSeFODTz6 sX1dAPKx8LGbIwWpwotXAqEP9Dk1gklrD3uNI/Rr1HZ2htQMIBP2+csILf6ftDeWeb2m aL9geqf8sthEvRi3rCCu9VdqiBO67KFUW3wakcLIdfE0GTei++SgoB5Hwng0sVlvQsx8 MUHA== ARC-Authentication-Results: i=1; mx.google.com; dkim=pass header.i=@linaro.org header.s=google header.b=aLk7IIrY; spf=pass (google.com: domain of netdev-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=netdev-owner@vger.kernel.org; dmarc=pass (p=NONE sp=NONE dis=NONE) header.from=linaro.org Return-Path: Received: from vger.kernel.org (vger.kernel.org. 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Signed-off-by: Loic Poulain --- drivers/net/mhi_net.c | 13 +++++-------- 1 file changed, 5 insertions(+), 8 deletions(-) -- 2.7.4 diff --git a/drivers/net/mhi_net.c b/drivers/net/mhi_net.c index 3da820b..f83562d 100644 --- a/drivers/net/mhi_net.c +++ b/drivers/net/mhi_net.c @@ -25,7 +25,6 @@ struct mhi_net_stats { u64_stats_t tx_bytes; u64_stats_t tx_errors; u64_stats_t tx_dropped; - atomic_t rx_queued; struct u64_stats_sync tx_syncp; struct u64_stats_sync rx_syncp; }; @@ -138,9 +137,9 @@ static void mhi_net_dl_callback(struct mhi_device *mhi_dev, { struct mhi_net_dev *mhi_netdev = dev_get_drvdata(&mhi_dev->dev); struct sk_buff *skb = mhi_res->buf_addr; - int remaining; + int free_desc_count; - remaining = atomic_dec_return(&mhi_netdev->stats.rx_queued); + free_desc_count = mhi_get_free_desc_count(mhi_dev, DMA_FROM_DEVICE); if (unlikely(mhi_res->transaction_status)) { dev_kfree_skb_any(skb); @@ -164,7 +163,7 @@ static void mhi_net_dl_callback(struct mhi_device *mhi_dev, } /* Refill if RX buffers queue becomes low */ - if (remaining <= mhi_netdev->rx_queue_sz / 2) + if (free_desc_count >= mhi_netdev->rx_queue_sz / 2) schedule_delayed_work(&mhi_netdev->rx_refill, 0); } @@ -211,7 +210,7 @@ static void mhi_net_rx_refill_work(struct work_struct *work) struct sk_buff *skb; int err; - while (atomic_read(&mhi_netdev->stats.rx_queued) < mhi_netdev->rx_queue_sz) { + while (!mhi_queue_is_full(mdev, DMA_FROM_DEVICE)) { skb = netdev_alloc_skb(ndev, size); if (unlikely(!skb)) break; @@ -224,8 +223,6 @@ static void mhi_net_rx_refill_work(struct work_struct *work) break; } - atomic_inc(&mhi_netdev->stats.rx_queued); - /* Do not hog the CPU if rx buffers are consumed faster than * queued (unlikely). */ @@ -233,7 +230,7 @@ static void mhi_net_rx_refill_work(struct work_struct *work) } /* If we're still starved of rx buffers, reschedule later */ - if (unlikely(!atomic_read(&mhi_netdev->stats.rx_queued))) + if (mhi_get_free_desc_count(mdev, DMA_FROM_DEVICE) == mhi_netdev->rx_queue_sz) schedule_delayed_work(&mhi_netdev->rx_refill, HZ / 2); }