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[23.128.96.18]) by mx.google.com with ESMTP id v19si156790eds.239.2021.01.11.09.10.30; Mon, 11 Jan 2021 09:10:30 -0800 (PST) Received-SPF: pass (google.com: domain of linux-arm-msm-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=kUW5CqEQ; spf=pass (google.com: domain of linux-arm-msm-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-arm-msm-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 S2389252AbhAKRJ0 (ORCPT + 15 others); Mon, 11 Jan 2021 12:09:26 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43744 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389249AbhAKRJ0 (ORCPT ); Mon, 11 Jan 2021 12:09:26 -0500 Received: from mail-wm1-x32b.google.com (mail-wm1-x32b.google.com [IPv6:2a00:1450:4864:20::32b]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id EB717C061794 for ; Mon, 11 Jan 2021 09:08:44 -0800 (PST) Received: by mail-wm1-x32b.google.com with SMTP id a6so453772wmc.2 for ; Mon, 11 Jan 2021 09:08:44 -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=kUW5CqEQs9SETIKZTrB6N2/ELutK/EqnMQN/CwzHvXbjSgIhpYzHwh9zCbi0+Luhy7 tYmM0jU+B0uuE+o2EX+2zjJMkzLBrfsIX0oCT672GTS3OV4NKAQoPIoHXFj1iSNPet/Y VF+baHMUY9F52SRfoRdK4YZ+qKpHTt5L+iybZYBHErnglzKbSBXxdFqyn58KPn7U6th4 SPcyY8NldxtYldlfa+tbHAwzRAI/GI9L15gow1kuMlZijAtNBJqCvb/zhi+SfzlinZgb 0zrdVAhWVtARgDPsEvK1wanyDHcsIvu9FHMWf73IH+Pq3HNX/IHPwkTlF47dgfo/sPoN KhsA== 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=aJ2l6wTklIvVk9AnW6HFw3nzBxZ7psIaRzQLzy7yk2eisGGMBrc4oji40wRdaLmCgg Zx/82+skSMMnEzu6GmytMvQN5BoDqKYfb7JN1Q5dwKBV4WasozQftQmqewhs0PZX08wC a7GWQKkcxJ9DHiQ8H7o5XNehfEdUVupPJheD+WszP0Rk2+j/8v0RHBp1+TbScvlLwed1 /8ICYxsOJ1+9ec7uWcAmi8kCG8JJhisfRbzbmoflElg9bzw+QWDZ7cLxvTZVgSj7ARq/ sqzHJImBQSXva7solYf8MDbFvVmKPf0dHLnBskHGPAuFZciSetrFD6aexwy3HDl0UWe9 4ESA== X-Gm-Message-State: AOAM530Jhzb9LgUJgxktc7HrX8FIW2IfwKdIL1/AqsMNzrR55HEVLhG1 psAx3llcNV2X6FZ2R46JelXCeg== X-Received: by 2002:a1c:6506:: with SMTP id z6mr596622wmb.55.1610384923659; Mon, 11 Jan 2021 09:08:43 -0800 (PST) Received: from localhost.localdomain ([88.122.66.28]) by smtp.gmail.com with ESMTPSA id i18sm279364wrp.74.2021.01.11.09.08.42 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Mon, 11 Jan 2021 09:08:43 -0800 (PST) From: Loic Poulain To: kuba@kernel.org, davem@davemloft.net Cc: linux-kernel@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 18:16:17 +0100 Message-Id: <1610385379-15140-1-git-send-email-loic.poulain@linaro.org> X-Mailer: git-send-email 2.7.4 Precedence: bulk List-ID: X-Mailing-List: linux-arm-msm@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