From patchwork Thu Dec 10 11:15:49 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Loic Poulain X-Patchwork-Id: 1414002 Return-Path: X-Original-To: patchwork-incoming-netdev@ozlabs.org Delivered-To: patchwork-incoming-netdev@ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=netdev-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=linaro.org Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=linaro.org header.i=@linaro.org header.a=rsa-sha256 header.s=google header.b=thzzgsdX; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 4CsB5T3dWcz9sWC for ; Thu, 10 Dec 2020 22:09:49 +1100 (AEDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732998AbgLJLJd (ORCPT ); Thu, 10 Dec 2020 06:09:33 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57936 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731319AbgLJLJa (ORCPT ); Thu, 10 Dec 2020 06:09:30 -0500 Received: from mail-wm1-x342.google.com (mail-wm1-x342.google.com [IPv6:2a00:1450:4864:20::342]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 43C87C061793 for ; Thu, 10 Dec 2020 03:08:50 -0800 (PST) Received: by mail-wm1-x342.google.com with SMTP id g185so4862351wmf.3 for ; Thu, 10 Dec 2020 03:08:50 -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=VapKC0F7lyscSctbK97hEtuP5mXbtCFlx94A7dqei/c=; b=thzzgsdXnMcBCx4HmSmaa1ZwCbajIM4XmNOg9MwjyjmioAJYcIbAJW1meuJwoFDkM3 xW41EHEvBr+b1eGkrtXEamJqtafB91ERnpZ2vfbSHzrAVOOpl6yZKjtGhOvbXU3VDvKI oD5aRb0r7DhYgGnGIQXSNcTDhXuWiv/X5QmfdOT1zTYRrXS1mVhGrdOsWBhJdvrKeQbX 0r7GXEcT4keLDBliAJ8NRpjy/OdW9LOGfR1D77L3M9nbj5bf1Of8QFnd1nUSjSx6cE44 lEtz6iDphnhvFrJb4vSCqRwexayYrCegDf44XZnWB01L1KQlZmxFG1VNBo0gmhtkDmxI T2JQ== 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=VapKC0F7lyscSctbK97hEtuP5mXbtCFlx94A7dqei/c=; b=MH3Sku9ZbQTaToWvymyC1Rqq/earG9Lb51wzgs6TTHXZN44h+aurp4zwGQDFbiKD8j t6y/wa/v5d/HyLfjeBLd6t4x4XPPLiq+6Bxz2geTOHHJFoyREvPgo8bSqMijwSS9hpVR TNXyhqWwwGn97a0jJYaFB8D6P1uivntRyEyVGKkROPvp6pl1r/Hrkw4pdfW1K1awLEet vv+uq1kfr1f3d2x5UH1ETad/putWznqHwYcN7+JMCdfyuajOelBPy+NrcG7CkQ6dTbAj qvpEhLrV14q4fCA08pxmie5rUi3xrCzp8D1GNS0WIfmyL1Qk74MmTpQEMojWn1JHGK9G Lkiw== X-Gm-Message-State: AOAM533l6w84yhoDP8SIx42UNuB19Sf5dKacYRz00xsLj6YhUuCTJLU5 D7bg+58Sg8ZOM5NPs/r7pp0IFA== X-Google-Smtp-Source: ABdhPJyOWS+5uAXDH8mhqvSCmbXlXNt+9gVCBrc6da4fN5Lm4DZ9VLwEellB0qolj6aDFhFCOMoyPQ== X-Received: by 2002:a1c:6a13:: with SMTP id f19mr7405352wmc.10.1607598528905; Thu, 10 Dec 2020 03:08:48 -0800 (PST) Received: from localhost.localdomain ([2a01:e0a:490:8730:4468:1cc2:be0c:233f]) by smtp.gmail.com with ESMTPSA id n123sm8961809wmn.7.2020.12.10.03.08.48 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 10 Dec 2020 03:08:48 -0800 (PST) From: Loic Poulain To: kuba@kernel.org, davem@davemloft.net Cc: manivannan.sadhasivam@linaro.org, linux-arm-msm@vger.kernel.org, netdev@vger.kernel.org, jhugo@codeaurora.org, Hemant Kumar Subject: [PATCH v2 1/3] bus: mhi: core: Add helper API to return number of free TREs Date: Thu, 10 Dec 2020 12:15:49 +0100 Message-Id: <1607598951-2340-1-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 --- v2: no change 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 54d9c80..a24ba4f 100644 --- a/drivers/bus/mhi/core/main.c +++ b/drivers/bus/mhi/core/main.c @@ -303,6 +303,18 @@ 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 09f786e..25c69a0 100644 --- a/include/linux/mhi.h +++ b/include/linux/mhi.h @@ -616,6 +616,15 @@ 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