From patchwork Wed Aug 16 17:19:01 2017 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Sricharan Ramabadhran X-Patchwork-Id: 9904351 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id 0A081603B5 for ; Wed, 16 Aug 2017 17:24:34 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E4F93289B6 for ; Wed, 16 Aug 2017 17:24:33 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D72B928856; Wed, 16 Aug 2017 17:24:33 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.8 required=2.0 tests=BAYES_00,DKIM_SIGNED, RCVD_IN_DNSWL_HI,T_DKIM_INVALID autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5A825288B3 for ; Wed, 16 Aug 2017 17:24:33 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752339AbdHPRYR (ORCPT ); Wed, 16 Aug 2017 13:24:17 -0400 Received: from smtp.codeaurora.org ([198.145.29.96]:51678 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752219AbdHPRT6 (ORCPT ); Wed, 16 Aug 2017 13:19:58 -0400 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 4A54E60720; Wed, 16 Aug 2017 17:19:54 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1502903997; bh=ZjlsX2rWT8nEfTNRClILGd2ksaDphZwAF9E5TtMjLNs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=TLL9NsDL406EMgtXvKqAoj4sLVnqbUBz3ex9sS5MZuB1NDkfCqXXJJHdhVYeKbpQ3 O9U6e1oLRxbVqV3JTB3Q1+Q28HIaub5m9o+RPhX244YxBxy5QmlY4WbYv49h6gEHxT GhknM5O8eLr0Xw14SB39os+4bC8Y+u4o8U+4nAzo= Received: from srichara-linux.qualcomm.com (blr-c-bdr-fw-01_globalnat_allzones-outside.qualcomm.com [103.229.19.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: sricharan@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 32AC460847; Wed, 16 Aug 2017 17:19:49 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1502903992; bh=ZjlsX2rWT8nEfTNRClILGd2ksaDphZwAF9E5TtMjLNs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OmD7hr4pX6W93NYoCtOShXvwrL6QAAdbrKa8kwc8AzfRtCpxJHw7z0Q6VKuGu0k4/ 67jVuzo0A12geM3Krz/ZHHqBxmsBhFaWsAPfbzQAaRLBEbp7SVB1bWohCQwxn+d/Xq +ojFop9P8L/Ecn0ZAyx4E8YEgNcs5wPKk8H9NEe0= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 32AC460847 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=sricharan@codeaurora.org From: Sricharan R To: ohad@wizery.com, bjorn.andersson@linaro.org, linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-msm@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: sricharan@codeaurora.org Subject: [PATCH 08/18] rpmsg: glink: Add support for transport version negotiation Date: Wed, 16 Aug 2017 22:49:01 +0530 Message-Id: <1502903951-5403-9-git-send-email-sricharan@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1502903951-5403-1-git-send-email-sricharan@codeaurora.org> References: <1502903951-5403-1-git-send-email-sricharan@codeaurora.org> Sender: linux-remoteproc-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-remoteproc@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP G-link supports a version number and feature flags for each transport. A combination of the version number and feature flags enable/disable: (*) G-Link software updates for each edge (*) Individual features for each edge Endpoints negotiate both the version and the supported flags when the transport is opened and they cannot be changed after negotiation has been completed. Each full implementation of G-Link must support a minimum of the current version, the previous version, and the base negotiation version called v0. Signed-off-by: Sricharan R Signed-off-by: Bjorn Andersson --- drivers/rpmsg/qcom_glink_native.c | 75 ++++++++++++++++++++++++++++++++++++--- drivers/rpmsg/qcom_glink_native.h | 5 +++ drivers/rpmsg/qcom_glink_rpm.c | 4 ++- drivers/rpmsg/qcom_glink_smem.c | 1 + 4 files changed, 79 insertions(+), 6 deletions(-) diff --git a/drivers/rpmsg/qcom_glink_native.c b/drivers/rpmsg/qcom_glink_native.c index dd22a23..4d24561 100644 --- a/drivers/rpmsg/qcom_glink_native.c +++ b/drivers/rpmsg/qcom_glink_native.c @@ -31,6 +31,7 @@ #include "qcom_glink_native.h" #define GLINK_NAME_SIZE 32 +#define GLINK_VERSION_1 1 #define RPM_GLINK_CID_MIN 1 #define RPM_GLINK_CID_MAX 65536 @@ -93,6 +94,9 @@ struct qcom_glink { struct mutex idr_lock; struct idr lcids; struct idr rcids; + unsigned long features; + + bool intentless; }; enum { @@ -255,8 +259,8 @@ static int qcom_glink_send_version(struct qcom_glink *glink) struct glink_msg msg; msg.cmd = cpu_to_le16(RPM_CMD_VERSION); - msg.param1 = cpu_to_le16(1); - msg.param2 = cpu_to_le32(GLINK_FEATURE_INTENTLESS); + msg.param1 = cpu_to_le16(GLINK_VERSION_1); + msg.param2 = cpu_to_le32(glink->features); return qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); } @@ -266,8 +270,8 @@ static void qcom_glink_send_version_ack(struct qcom_glink *glink) struct glink_msg msg; msg.cmd = cpu_to_le16(RPM_CMD_VERSION_ACK); - msg.param1 = cpu_to_le16(1); - msg.param2 = cpu_to_le32(0); + msg.param1 = cpu_to_le16(GLINK_VERSION_1); + msg.param2 = cpu_to_le32(glink->features); qcom_glink_tx(glink, &msg, sizeof(msg), NULL, 0, true); } @@ -361,6 +365,63 @@ static void qcom_glink_send_close_ack(struct qcom_glink *glink, qcom_glink_tx(glink, &req, sizeof(req), NULL, 0, true); } +/** + * qcom_glink_receive_version() - receive version/features from remote system + * + * @glink: pointer to transport interface + * @r_version: remote version + * @r_features: remote features + * + * This function is called in response to a remote-initiated version/feature + * negotiation sequence. + */ +static void qcom_glink_receive_version(struct qcom_glink *glink, + u32 version, + u32 features) +{ + switch (version) { + case 0: + break; + case GLINK_VERSION_1: + glink->features &= features; + /* FALLTHROUGH */ + default: + qcom_glink_send_version_ack(glink); + break; + } +} + +/** + * qcom_glink_receive_version_ack() - receive negotiation ack from remote system + * + * @glink: pointer to transport interface + * @r_version: remote version response + * @r_features: remote features response + * + * This function is called in response to a local-initiated version/feature + * negotiation sequence and is the counter-offer from the remote side based + * upon the initial version and feature set requested. + */ +static void qcom_glink_receive_version_ack(struct qcom_glink *glink, + u32 version, + u32 features) +{ + switch (version) { + case 0: + /* Version negotiation failed */ + break; + case GLINK_VERSION_1: + if (features == glink->features) + break; + + glink->features &= features; + /* FALLTHROUGH */ + default: + qcom_glink_send_version(glink); + break; + } +} + static int qcom_glink_rx_defer(struct qcom_glink *glink, size_t extra) { struct glink_defer_cmd *dcmd; @@ -908,9 +969,10 @@ static void qcom_glink_work(struct work_struct *work) switch (cmd) { case RPM_CMD_VERSION: - qcom_glink_send_version_ack(glink); + qcom_glink_receive_version(glink, param1, param2); break; case RPM_CMD_VERSION_ACK: + qcom_glink_receive_version_ack(glink, param1, param2); break; case RPM_CMD_OPEN: qcom_glink_rx_open(glink, param1, msg->data); @@ -931,6 +993,7 @@ static void qcom_glink_work(struct work_struct *work) } struct qcom_glink *qcom_glink_native_probe(struct device *dev, + unsigned long features, struct qcom_glink_pipe *rx, struct qcom_glink_pipe *tx) { @@ -946,6 +1009,8 @@ struct qcom_glink *qcom_glink_native_probe(struct device *dev, glink->tx_pipe = tx; glink->rx_pipe = rx; + glink->features = features; + mutex_init(&glink->tx_lock); spin_lock_init(&glink->rx_lock); INIT_LIST_HEAD(&glink->rx_queue); diff --git a/drivers/rpmsg/qcom_glink_native.h b/drivers/rpmsg/qcom_glink_native.h index d5627a4..f418787 100644 --- a/drivers/rpmsg/qcom_glink_native.h +++ b/drivers/rpmsg/qcom_glink_native.h @@ -14,6 +14,10 @@ #ifndef __QCOM_GLINK_NATIVE_H__ #define __QCOM_GLINK_NATIVE_H__ +#define GLINK_FEATURE_INTENT_REUSE BIT(0) +#define GLINK_FEATURE_MIGRATION BIT(1) +#define GLINK_FEATURE_TRACER_PKT BIT(2) + struct qcom_glink_pipe { size_t length; @@ -31,6 +35,7 @@ struct qcom_glink_pipe { struct qcom_glink; struct qcom_glink *qcom_glink_native_probe(struct device *dev, + unsigned long features, struct qcom_glink_pipe *rx, struct qcom_glink_pipe *tx); void qcom_glink_native_remove(struct qcom_glink *glink); diff --git a/drivers/rpmsg/qcom_glink_rpm.c b/drivers/rpmsg/qcom_glink_rpm.c index cc73af0..7d039cd 100644 --- a/drivers/rpmsg/qcom_glink_rpm.c +++ b/drivers/rpmsg/qcom_glink_rpm.c @@ -302,7 +302,9 @@ static int glink_rpm_probe(struct platform_device *pdev) writel(0, tx_pipe->head); writel(0, rx_pipe->tail); - glink = qcom_glink_native_probe(&pdev->dev, &rx_pipe->native, + glink = qcom_glink_native_probe(&pdev->dev, + 0, + &rx_pipe->native, &tx_pipe->native); if (IS_ERR(glink)) return PTR_ERR(glink); diff --git a/drivers/rpmsg/qcom_glink_smem.c b/drivers/rpmsg/qcom_glink_smem.c index defa10b..496a5e3 100644 --- a/drivers/rpmsg/qcom_glink_smem.c +++ b/drivers/rpmsg/qcom_glink_smem.c @@ -278,6 +278,7 @@ struct qcom_glink *qcom_glink_smem_register(struct device *parent, *tx_pipe->head = 0; glink = qcom_glink_native_probe(dev, + GLINK_FEATURE_TRACER_PKT, &rx_pipe->native, &tx_pipe->native); if (IS_ERR(glink)) { ret = PTR_ERR(glink);