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: 12011343 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER, INCLUDES_PATCH,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, 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 25A31C433E0 for ; Mon, 11 Jan 2021 18:01:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id E36C420738 for ; Mon, 11 Jan 2021 18:01:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2389665AbhAKSAs (ORCPT ); Mon, 11 Jan 2021 13:00:48 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:54882 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2389620AbhAKSAr (ORCPT ); Mon, 11 Jan 2021 13:00:47 -0500 Received: from mail-wr1-x430.google.com (mail-wr1-x430.google.com [IPv6:2a00:1450:4864:20::430]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 5199DC061786 for ; Mon, 11 Jan 2021 10:00:07 -0800 (PST) Received: by mail-wr1-x430.google.com with SMTP id r7so708058wrc.5 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=bgRuoywSaJyZKWfTQZ2i+mDSHWg+Axv/S64vcWRBZUM7wC6FdIO9Mr1WOtllPeculY zhdp+w3wcfRtV0QXldE6vDf83O4jziK6oUBgOtVsG8GHaU50v6Tlnw+vMAPqPUsSLUll LYBIIfAOWrdo3k0wd+Pl3PUFivitTzv473nzEv0ed/cyaRqw6lFMYdYEaJen8n6Afu80 h9E1JOFuXVTIWPQRRI8BE4AWbjJR/nSkCbpHn9ltCUksznvvycezVmyekwK9/v5IKR0k Yoz/KNOSCqRzJUs5GM+ffByM6u9VThsscNgZmHL8H1Y4ap96FqRcyA79QU4wsj8HLvVD /b5g== X-Gm-Message-State: AOAM531kHVH9ImlREDzv4dnKKAM7Pp8nkg6Q1YEkz3Jp5us/dVT0uMbJ Tf0LoVOU1BNXf1G96DEMZ+DeHw== X-Google-Smtp-Source: ABdhPJyJUY4VchB207CwJz2pmCVJkJfTUIdTxaXswHaiiPtGVLt3mk/Nn2cUZ2JDTVWPpNyeMkyrvw== 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: 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(+) 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