From patchwork Tue Oct 27 08:39:36 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Loic Poulain X-Patchwork-Id: 298571 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=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, 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 A90F6C388F9 for ; Tue, 27 Oct 2020 08:33:22 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 582A921D24 for ; Tue, 27 Oct 2020 08:33:22 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="wugiRjSd" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2894950AbgJ0IdT (ORCPT ); Tue, 27 Oct 2020 04:33:19 -0400 Received: from mail-wm1-f67.google.com ([209.85.128.67]:33577 "EHLO mail-wm1-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2894934AbgJ0IdS (ORCPT ); Tue, 27 Oct 2020 04:33:18 -0400 Received: by mail-wm1-f67.google.com with SMTP id l20so542180wme.0 for ; Tue, 27 Oct 2020 01:33:14 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linaro.org; s=google; h=from:to:cc:subject:date:message-id; bh=U/MlWRxuh8uUr+vmJkiS4054PFdvq7A/wa6DJ1XOAEc=; b=wugiRjSdvw8wQdvKpUxTNVedcZ6NOrfWbbgBdzXhMOX5kI/Ns/djPwPgsMC0EvqHvS fbTh5HGLKo5rKK3Pi5pTYYM1dHY5H+Vx7Z1k9WKsxSPZtCqthMRpAVbHQ/eIFIly1h0G JMxmF+A6HDD28PUWW8u1hTqmkXYVoJ0nU5C+eWE7IOrgnpscmRmRFt/MXzcLIxX/XAOj xbZiBrWNiIXvrO4nFh/SMrD7pmikuGIDevF9l6UwASJR3Rq+kIY0pzB6tX3kuGTv8HMk kZcnavOvYKeBZnRv0qXXKcbJbzlEYCol+fNt+RLn+zf5WP6XhN8Ars/gViNdnMFdSh0U L8Vg== 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=U/MlWRxuh8uUr+vmJkiS4054PFdvq7A/wa6DJ1XOAEc=; b=fAYCu1RMZnh7ripMzxZNz2q3b/1wgK4UWesxCwKj+2TGfFV8taQChkTUkQGvUqiE4W VLGebIGAPoS6hss/1rloogCSq6BYLNwWuEZq4X9wx+X/z8lyiDnonbTi0mKvF79ekDRB wHIztAcYSREzFHUYCLEIsO8wU5FIcuG5VDOeNgk4/6oN3WKmqNE9gUtxdZJNFJtXmcAO aFrKFf6KHyiUjenI6WMaqa/pijxVtqQ1RV/Z1DFhJ05FBjyPwSkOGjBHrDl/u77+6qSI GteanSti2xgfccMLhNaqwsdouX8jdydUVI7GCcJT4OYGO1Nrpp+9mL+18efc+x2I+7Gk p7ww== X-Gm-Message-State: AOAM532JPGAl3wF9j+wNslEQkNHvq7pUQOdn7jTRzt+aUtbQLfOaScuC B82x8Tc24VQqhAnuoQD5tHjOMA== X-Google-Smtp-Source: ABdhPJysd+TQD2LRMFSTrN483vEA9Is4itZxLwdZPhjQpsh3lOLfjolcK0ML0phnkCIVl+a/fFT0Fw== X-Received: by 2002:a05:600c:2246:: with SMTP id a6mr1372275wmm.135.1603787594035; Tue, 27 Oct 2020 01:33:14 -0700 (PDT) Received: from localhost.localdomain ([88.122.66.28]) by smtp.gmail.com with ESMTPSA id u6sm976361wmj.40.2020.10.27.01.33.13 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 27 Oct 2020 01:33:13 -0700 (PDT) From: Loic Poulain To: kuba@kernel.org, davem@davemloft.net, manivannan.sadhasivam@linaro.org, hemantk@codeaurora.org Cc: netdev@vger.kernel.org, linux-arm-msm@vger.kernel.org, jhugo@codeaurora.org, bbhatt@codeaurora.org, Loic Poulain Subject: [PATCH v7 1/2] bus: mhi: Add mhi_queue_is_full function Date: Tue, 27 Oct 2020 09:39:36 +0100 Message-Id: <1603787977-6975-1-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 This function can be used by client driver to determine whether it's possible to queue new elements in a channel ring. Signed-off-by: Loic Poulain --- v1->v5: not part of the series v6: Add this commit, used for stopping TX queue v7: no change drivers/bus/mhi/core/main.c | 15 +++++++++++++-- include/linux/mhi.h | 7 +++++++ 2 files changed, 20 insertions(+), 2 deletions(-) diff --git a/drivers/bus/mhi/core/main.c b/drivers/bus/mhi/core/main.c index a588eac..44aa11f 100644 --- a/drivers/bus/mhi/core/main.c +++ b/drivers/bus/mhi/core/main.c @@ -943,8 +943,8 @@ void mhi_ctrl_ev_task(unsigned long data) } } -static bool mhi_is_ring_full(struct mhi_controller *mhi_cntrl, - struct mhi_ring *ring) +static inline bool mhi_is_ring_full(struct mhi_controller *mhi_cntrl, + struct mhi_ring *ring) { void *tmp = ring->wp + ring->el_size; @@ -1173,6 +1173,17 @@ int mhi_queue_buf(struct mhi_device *mhi_dev, enum dma_data_direction dir, } EXPORT_SYMBOL_GPL(mhi_queue_buf); +bool mhi_queue_is_full(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 mhi_is_ring_full(mhi_cntrl, tre_ring); +} +EXPORT_SYMBOL_GPL(mhi_queue_is_full); + int mhi_send_cmd(struct mhi_controller *mhi_cntrl, struct mhi_chan *mhi_chan, enum mhi_cmd_type cmd) diff --git a/include/linux/mhi.h b/include/linux/mhi.h index 9d67e75..f72c3a4 100644 --- a/include/linux/mhi.h +++ b/include/linux/mhi.h @@ -745,4 +745,11 @@ int mhi_queue_buf(struct mhi_device *mhi_dev, enum dma_data_direction dir, int mhi_queue_skb(struct mhi_device *mhi_dev, enum dma_data_direction dir, struct sk_buff *skb, size_t len, enum mhi_flags mflags); +/** + * mhi_queue_is_full - Determine whether queueing new elements is possible + * @mhi_dev: Device associated with the channels + * @dir: DMA direction for the channel + */ +bool mhi_queue_is_full(struct mhi_device *mhi_dev, enum dma_data_direction dir); + #endif /* _MHI_H_ */