From patchwork Tue Oct 13 23:25:19 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Mathieu Poirier X-Patchwork-Id: 11837207 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 4E4D914B5 for ; Wed, 14 Oct 2020 09:24:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 0D703206F4 for ; Wed, 14 Oct 2020 09:24:36 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=linaro.org header.i=@linaro.org header.b="vfYybF6X" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729301AbgJNJYg (ORCPT ); Wed, 14 Oct 2020 05:24:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39964 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730812AbgJNJUK (ORCPT ); Wed, 14 Oct 2020 05:20:10 -0400 Received: from mail-pg1-x542.google.com (mail-pg1-x542.google.com [IPv6:2607:f8b0:4864:20::542]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id C3631C08EAC1 for ; Tue, 13 Oct 2020 16:25:32 -0700 (PDT) Received: by mail-pg1-x542.google.com with SMTP id x13so726796pgp.7 for ; Tue, 13 Oct 2020 16:25:32 -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:in-reply-to:references :mime-version:content-transfer-encoding; bh=l3Mt/0E9AmGeziRvZyZJfVySy927OsM82c2xG5wHBJ0=; b=vfYybF6Xx0JLOBoKy7O795Xg8FWZlvzUUw3+rZbNAkKS20S6kK9UqruBKkRvb4NFTT S/JVwIEXLyhr4NhAg9LjErZNpknyoEcWy+uKGvjxLbYDEm30mdceLxutDoxM7tsjMkeJ ZX5NvHVVsFr750r8QTsZsi+hSKZprNApmk7Z0U2lISuY6a2lN5MyEHWWT8ogNr8e+Kf+ pgExKU4ko7atGtnhawaT2p2k/swPbGmc2kxlekEwKj9OQWgKinm1dGNm+Ckm+jvMvKg0 jG9R/edlQW/1xBEceYAfqfKfMgyXZfHeO99hzQKjZ/zbd7h8oyAYpGiF+p6ItWzo72ZY AghQ== 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:in-reply-to :references:mime-version:content-transfer-encoding; bh=l3Mt/0E9AmGeziRvZyZJfVySy927OsM82c2xG5wHBJ0=; b=BPuKSf2ZQ0DNGvkJR+Oc069bm8nvp4p3Gi3Q/aNTWJUSCIeZgw34cGS+RYiLY3j971 2Xo2aevwLArJz5DafGcMZwpBB/z4PKSvWRbBKc8Cs7wjJtkP39DRvYfm6eHRU3N7Tccz BfBB0+CsQGUMTZ3gfgZAePwe4DAVZD7FvOCjmL3eTUHBIiHZ60fqWp+raxCL+ilu4FxD MHGDhGcfRByapyX1QYAF0iprzEBhM6kzOD/32PgjtPxX2s/DdHWjnqk/dzMNNxfZBndP kaLRGB4xKcVrj+eYPK2aSLj8V3mGP+pXL82EpGtThXCE3DatBXJnLZWOHM33/FQPvlIL mbLQ== X-Gm-Message-State: AOAM5320HQ9NpDeAsOSzMUg0rCo71hnZVauDDyY1F5lMm1sZifwz8xm/ GS/G90TYCb0x0VwUhvq2GRidcQ== X-Google-Smtp-Source: ABdhPJzEJ/TDl6Cn89HkHFRbim59nkC5HRgyfhLFGK1p4KY7VJEs3812nYPYwy822nyv33PvfjArcA== X-Received: by 2002:a63:f815:: with SMTP id n21mr1573710pgh.410.1602631532303; Tue, 13 Oct 2020 16:25:32 -0700 (PDT) Received: from xps15.cg.shawcable.net (S0106002369de4dac.cg.shawcable.net. [68.147.8.254]) by smtp.gmail.com with ESMTPSA id b8sm791871pfr.159.2020.10.13.16.25.31 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 13 Oct 2020 16:25:31 -0700 (PDT) From: Mathieu Poirier To: ohad@wizery.com, bjorn.andersson@linaro.org Cc: guennadi.liakhovetski@linux.intel.com, arnaud.pouliquen@st.com, linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 9/9] rpmsg: Turn name service into a stand alone driver Date: Tue, 13 Oct 2020 17:25:19 -0600 Message-Id: <20201013232519.1367542-10-mathieu.poirier@linaro.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201013232519.1367542-1-mathieu.poirier@linaro.org> References: <20201013232519.1367542-1-mathieu.poirier@linaro.org> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-remoteproc@vger.kernel.org From: Arnaud Pouliquen Make the RPMSG name service announcement a stand alone driver so that it can be reused by other subsystems. It is also the first step in making the functionatlity transport independent, i.e that is not tied to virtIO. Co-developed-by: Mathieu Poirier Signed-off-by: Arnaud Pouliquen --- drivers/rpmsg/Kconfig | 8 +++ drivers/rpmsg/Makefile | 1 + drivers/rpmsg/rpmsg_ns.c | 110 +++++++++++++++++++++++++++++++ drivers/rpmsg/virtio_rpmsg_bus.c | 84 +++++------------------ include/linux/rpmsg_ns.h | 17 +++++ 5 files changed, 154 insertions(+), 66 deletions(-) create mode 100644 drivers/rpmsg/rpmsg_ns.c diff --git a/drivers/rpmsg/Kconfig b/drivers/rpmsg/Kconfig index f96716893c2a..c3fc75e6514b 100644 --- a/drivers/rpmsg/Kconfig +++ b/drivers/rpmsg/Kconfig @@ -15,6 +15,14 @@ config RPMSG_CHAR in /dev. They make it possible for user-space programs to send and receive rpmsg packets. +config RPMSG_NS + tristate "RPMSG name service announcement" + depends on RPMSG + help + Say Y here to enable the support of the name service announcement + channel that probes the associated RPMsg device on remote endpoint + service announcement. + config RPMSG_MTK_SCP tristate "MediaTek SCP" depends on MTK_SCP diff --git a/drivers/rpmsg/Makefile b/drivers/rpmsg/Makefile index ffe932ef6050..8d452656f0ee 100644 --- a/drivers/rpmsg/Makefile +++ b/drivers/rpmsg/Makefile @@ -1,6 +1,7 @@ # SPDX-License-Identifier: GPL-2.0 obj-$(CONFIG_RPMSG) += rpmsg_core.o obj-$(CONFIG_RPMSG_CHAR) += rpmsg_char.o +obj-$(CONFIG_RPMSG_NS) += rpmsg_ns.o obj-$(CONFIG_RPMSG_MTK_SCP) += mtk_rpmsg.o qcom_glink-objs := qcom_glink_native.o qcom_glink_ssr.o obj-$(CONFIG_RPMSG_QCOM_GLINK) += qcom_glink.o diff --git a/drivers/rpmsg/rpmsg_ns.c b/drivers/rpmsg/rpmsg_ns.c new file mode 100644 index 000000000000..65be20583c8f --- /dev/null +++ b/drivers/rpmsg/rpmsg_ns.c @@ -0,0 +1,110 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) STMicroelectronics 2020 - All Rights Reserved + */ +#include +#include +#include +#include +#include +#include +#include + +#include "rpmsg_internal.h" + +/* invoked when a name service announcement arrives */ +static int rpmsg_ns_cb(struct rpmsg_device *rpdev, void *data, int len, + void *priv, u32 src) +{ + struct rpmsg_ns_msg *msg = data; + struct rpmsg_device *newch; + struct rpmsg_channel_info chinfo; + struct device *dev = rpdev->dev.parent; + int ret; + +#if defined(CONFIG_DYNAMIC_DEBUG) + dynamic_hex_dump("NS announcement: ", DUMP_PREFIX_NONE, 16, 1, + data, len, true); +#endif + + if (len != sizeof(*msg)) { + dev_err(dev, "malformed ns msg (%d)\n", len); + return -EINVAL; + } + + /* don't trust the remote processor for null terminating the name */ + msg->name[RPMSG_NAME_SIZE - 1] = '\0'; + + strncpy(chinfo.name, msg->name, sizeof(chinfo.name)); + chinfo.src = RPMSG_ADDR_ANY; + chinfo.dst = rpmsg32_to_cpu(rpdev, msg->addr); + + dev_info(dev, "%sing channel %s addr 0x%x\n", + rpmsg32_to_cpu(rpdev, msg->flags) & RPMSG_NS_DESTROY ? + "destroy" : "creat", msg->name, chinfo.dst); + + if (rpmsg32_to_cpu(rpdev, msg->flags) & RPMSG_NS_DESTROY) { + ret = rpmsg_release_channel(rpdev, &chinfo); + if (ret) + dev_err(dev, "rpmsg_destroy_channel failed: %d\n", ret); + } else { + newch = rpmsg_create_channel(rpdev, &chinfo); + if (!newch) + dev_err(dev, "rpmsg_create_channel failed\n"); + } + + return 0; +} + + +static int rpmsg_ns_probe(struct rpmsg_device *rpdev) +{ + struct rpmsg_endpoint *ns_ept; + struct rpmsg_channel_info ns_chinfo = { + .src = RPMSG_NS_ADDR, + .dst = RPMSG_NS_ADDR, + .name = "name_service", + }; + + /* + * Create the NS announcement service endpoint associated to the RPMsg + * device. The endpoint will be automatically destroyed when the RPMsg + * device will be deleted. + */ + ns_ept = rpmsg_create_ept(rpdev, rpmsg_ns_cb, NULL, ns_chinfo); + if (!ns_ept) { + dev_err(&rpdev->dev, "failed to create the ns ept\n"); + return -ENOMEM; + } + rpdev->ept = ns_ept; + + return 0; +} + +static struct rpmsg_driver rpmsg_ns_driver = { + .drv.name = "rpmsg_ns", + .probe = rpmsg_ns_probe, +}; + +static int rpmsg_ns_init(void) +{ + int ret; + + ret = register_rpmsg_driver(&rpmsg_ns_driver); + if (ret < 0) + pr_err("%s: Failed to register rpmsg driver\n", __func__); + + return ret; +} +postcore_initcall(rpmsg_ns_init); + +static void rpmsg_ns_exit(void) +{ + unregister_rpmsg_driver(&rpmsg_ns_driver); +} +module_exit(rpmsg_ns_exit); + +MODULE_DESCRIPTION("Name service announcement rpmsg Driver"); +MODULE_AUTHOR("Arnaud Pouliquen "); +MODULE_ALIAS("rpmsg_ns"); +MODULE_LICENSE("GPL v2"); diff --git a/drivers/rpmsg/virtio_rpmsg_bus.c b/drivers/rpmsg/virtio_rpmsg_bus.c index 1488b9ddc18d..a5284dc40ac5 100644 --- a/drivers/rpmsg/virtio_rpmsg_bus.c +++ b/drivers/rpmsg/virtio_rpmsg_bus.c @@ -49,7 +49,6 @@ * @endpoints_lock: lock of the endpoints set * @sendq: wait queue of sending contexts waiting for a tx buffers * @sleepers: number of senders that are waiting for a tx buffer - * @ns_ept: the bus's name service endpoint * * This structure stores the rpmsg state of a given virtio remote processor * device (there might be several virtio proc devices for each physical @@ -68,7 +67,6 @@ struct virtproc_info { struct mutex endpoints_lock; wait_queue_head_t sendq; atomic_t sleepers; - struct rpmsg_endpoint *ns_ept; }; /** @@ -794,68 +792,14 @@ static void rpmsg_xmit_done(struct virtqueue *svq) wake_up_interruptible(&vrp->sendq); } -/* invoked when a name service announcement arrives */ -static int rpmsg_ns_cb(struct rpmsg_device *rpdev, void *data, int len, - void *priv, u32 src) -{ - struct rpmsg_ns_msg *msg = data; - struct rpmsg_device *newch; - struct rpmsg_channel_info chinfo; - struct virtproc_info *vrp = priv; - struct device *dev = &vrp->vdev->dev; - int ret; - -#if defined(CONFIG_DYNAMIC_DEBUG) - dynamic_hex_dump("NS announcement: ", DUMP_PREFIX_NONE, 16, 1, - data, len, true); -#endif - - if (len != sizeof(*msg)) { - dev_err(dev, "malformed ns msg (%d)\n", len); - return -EINVAL; - } - - /* - * the name service ept does _not_ belong to a real rpmsg channel, - * and is handled by the rpmsg bus itself. - * for sanity reasons, make sure a valid rpdev has _not_ sneaked - * in somehow. - */ - if (rpdev) { - dev_err(dev, "anomaly: ns ept has an rpdev handle\n"); - return -EINVAL; - } - - /* don't trust the remote processor for null terminating the name */ - msg->name[RPMSG_NAME_SIZE - 1] = '\0'; - - strncpy(chinfo.name, msg->name, sizeof(chinfo.name)); - chinfo.src = RPMSG_ADDR_ANY; - chinfo.dst = rpmsg32_to_cpu(rpdev, msg->addr); - - dev_info(dev, "%sing channel %s addr 0x%x\n", - rpmsg32_to_cpu(rpdev, msg->flags) & RPMSG_NS_DESTROY ? - "destroy" : "creat", msg->name, chinfo.dst); - - if (rpmsg32_to_cpu(rpdev, msg->flags) & RPMSG_NS_DESTROY) { - ret = rpmsg_unregister_device(&vrp->vdev->dev, &chinfo); - if (ret) - dev_err(dev, "rpmsg_destroy_channel failed: %d\n", ret); - } else { - newch = __rpmsg_create_channel(vrp, &chinfo); - if (!newch) - dev_err(dev, "rpmsg_create_channel failed\n"); - } - - return 0; -} - static int rpmsg_probe(struct virtio_device *vdev) { vq_callback_t *vq_cbs[] = { rpmsg_recv_done, rpmsg_xmit_done }; static const char * const names[] = { "input", "output" }; struct virtqueue *vqs[2]; struct virtproc_info *vrp; + struct virtio_rpmsg_channel *vch; + struct rpmsg_device *rpdev_ns; void *bufs_va; int err = 0, i; size_t total_buf_space; @@ -931,14 +875,25 @@ static int rpmsg_probe(struct virtio_device *vdev) /* if supported by the remote processor, enable the name service */ if (virtio_has_feature(vdev, VIRTIO_RPMSG_F_NS)) { - /* a dedicated endpoint handles the name service msgs */ - vrp->ns_ept = __rpmsg_create_ept(vrp, NULL, rpmsg_ns_cb, - vrp, RPMSG_NS_ADDR); - if (!vrp->ns_ept) { - dev_err(&vdev->dev, "failed to create the ns ept\n"); + vch = kzalloc(sizeof(*vch), GFP_KERNEL); + if (!vch) { err = -ENOMEM; goto free_coherent; } + + /* Link the channel to our vrp */ + vch->vrp = vrp; + + /* Assign public information to the rpmsg_device */ + rpdev_ns = &vch->rpdev; + rpdev_ns->ops = &virtio_rpmsg_ops; + + rpdev_ns->dev.parent = &vrp->vdev->dev; + rpdev_ns->dev.release = virtio_rpmsg_release_device; + + err = rpmsg_ns_register_device(rpdev_ns); + if (err) + goto free_coherent; } /* @@ -991,9 +946,6 @@ static void rpmsg_remove(struct virtio_device *vdev) if (ret) dev_warn(&vdev->dev, "can't remove rpmsg device: %d\n", ret); - if (vrp->ns_ept) - __rpmsg_destroy_ept(vrp, vrp->ns_ept); - idr_destroy(&vrp->endpoints); vdev->config->del_vqs(vrp->vdev); diff --git a/include/linux/rpmsg_ns.h b/include/linux/rpmsg_ns.h index 3d836b8580b2..9e529ef40ce5 100644 --- a/include/linux/rpmsg_ns.h +++ b/include/linux/rpmsg_ns.h @@ -59,4 +59,21 @@ enum rpmsg_ns_flags { /* Address 53 is reserved for advertising remote services */ #define RPMSG_NS_ADDR (53) +/** + * rpmsg_ns_register_device() - register name service device based on rpdev + * @rpdev: prepared rpdev to be used for creating endpoints + * + * This function wraps rpmsg_register_device() preparing the rpdev for use as + * basis for the rpmsg name service device. + */ +static inline int rpmsg_ns_register_device(struct rpmsg_device *rpdev) +{ + strcpy(rpdev->id.name, "rpmsg_ns"); + rpdev->driver_override = "rpmsg_ns"; + rpdev->src = RPMSG_NS_ADDR; + rpdev->dst = RPMSG_NS_ADDR; + + return rpmsg_register_device(rpdev); +} + #endif