From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-172.mta0.migadu.com (out-172.mta0.migadu.com [91.218.175.172]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id E6A1720A5C4 for ; Mon, 9 Jun 2025 15:15:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=91.218.175.172 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749482159; cv=none; b=OxXpjW1jFHNeS0Bojce/V4OR03XohSxLfAkmPdYA+L6Odi6yPXHkFfH50PQoy80aserNmgQeb0pBBXUjKB/4W9zM9Ta6FVRy2lpby9gA1thdhDZ2APW4ejrLUDXmQI+NhwhKQXU9odt/Ts+BVwCGvDtZgLmEZd2ohUiCPPb/0VE= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1749482159; c=relaxed/simple; bh=QNG+zE4mWFtb9FRr3WpazQqA5rZC9KHWvHl/3r0KaKA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=ht1oEGhbpbHUyzQPvDm7kWlvafgEo5zLeMfLziPp5Lx1+t5ScCrHmx6cUInbwTFGzY9zoWwE6bYXMHfg6WYR8YUB1+sFi42F2jBZerzwx59q7/iEx+r9DAm6hVMrq1EhH11uJa8QXtvMKxVleS1/C+CZjouJtoAyKtZSkCoAJ7c= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=T36oThN+; arc=none smtp.client-ip=91.218.175.172 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="T36oThN+" X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1749482154; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=vnBXWEQUwbJBMJqABehIHdgXCe5t+ZWB6B67l34UOkg=; b=T36oThN+afmjEL3b2yIiP0jODfdIpRRreJ6et2nVryRxWNRTsTs0+FwG7J8XgvINl5491K bkrt3f3D7LEJrOO1y+GAFWS7fNEZFUOJ1NOY4gn+VxCJJoNtL2aCG0OlHd//pC5GauiNl3 bDLGXWO/yvs0xva/6KoEj1uhZp/ZqAM= From: Dawei Li To: andersson@kernel.org, mathieu.poirier@linaro.org Cc: linux-remoteproc@vger.kernel.org, linux-kernel@vger.kernel.org, dawei.li@linux.dev, set_pte_at@outlook.com Subject: [PATCH v4 2/3] rpmsg: char: Implement eptdev based on anonymous inode Date: Mon, 9 Jun 2025 23:15:30 +0800 Message-Id: <20250609151531.22621-3-dawei.li@linux.dev> In-Reply-To: <20250609151531.22621-1-dawei.li@linux.dev> References: <20250609151531.22621-1-dawei.li@linux.dev> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT Introduce new eptdev abstraction based on anonymous inode. The new API is exactly same with legacy one except: - It's anonymous and devnode/path free. - Its fops->open() is empty. Signed-off-by: Dawei Li --- drivers/rpmsg/rpmsg_char.c | 49 ++++++++++++++++++++++++++++++++++++++ drivers/rpmsg/rpmsg_char.h | 23 ++++++++++++++++++ 2 files changed, 72 insertions(+) diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c index 6c19f2146698..babc63cc4238 100644 --- a/drivers/rpmsg/rpmsg_char.c +++ b/drivers/rpmsg/rpmsg_char.c @@ -13,6 +13,7 @@ #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt +#include #include #include #include @@ -517,6 +518,54 @@ int rpmsg_chrdev_eptdev_create(struct rpmsg_device *rpdev, struct device *parent } EXPORT_SYMBOL(rpmsg_chrdev_eptdev_create); +static const struct file_operations rpmsg_anonymous_eptdev_fops = { + .owner = THIS_MODULE, + .release = rpmsg_eptdev_release, + .read_iter = rpmsg_eptdev_read_iter, + .write_iter = rpmsg_eptdev_write_iter, + .poll = rpmsg_eptdev_poll, + .unlocked_ioctl = rpmsg_eptdev_ioctl, + .compat_ioctl = compat_ptr_ioctl, +}; + +int rpmsg_anonymous_eptdev_create(struct rpmsg_device *rpdev, struct device *parent, + struct rpmsg_channel_info chinfo, unsigned int flags, + int *pfd) +{ + struct rpmsg_eptdev *eptdev; + int ret, fd; + + /* Anonymous inode only supports these file flags */ + if (flags & ~(O_ACCMODE | O_NONBLOCK | O_CLOEXEC)) + return -EINVAL; + + eptdev = rpmsg_eptdev_alloc(rpdev, parent, false); + if (IS_ERR(eptdev)) + return PTR_ERR(eptdev); + + ret = rpmsg_eptdev_add(eptdev, chinfo, false); + if (ret) { + dev_err(&eptdev->dev, "failed to add %s\n", eptdev->chinfo.name); + return ret; + } + + fd = anon_inode_getfd("rpmsg-eptdev", &rpmsg_anonymous_eptdev_fops, eptdev, flags); + if (fd < 0) { + put_device(&eptdev->dev); + return fd; + } + + mutex_lock(&eptdev->ept_lock); + ret = __rpmsg_eptdev_open(eptdev); + mutex_unlock(&eptdev->ept_lock); + + if (!ret) + *pfd = fd; + + return ret; +} +EXPORT_SYMBOL(rpmsg_anonymous_eptdev_create); + static int rpmsg_chrdev_probe(struct rpmsg_device *rpdev) { struct rpmsg_channel_info chinfo; diff --git a/drivers/rpmsg/rpmsg_char.h b/drivers/rpmsg/rpmsg_char.h index 117d9cbc52f0..70ce2c511f13 100644 --- a/drivers/rpmsg/rpmsg_char.h +++ b/drivers/rpmsg/rpmsg_char.h @@ -19,6 +19,22 @@ int rpmsg_chrdev_eptdev_create(struct rpmsg_device *rpdev, struct device *parent, struct rpmsg_channel_info chinfo); +/** + * rpmsg_anonymous_eptdev_create() - register anonymous device and its associated + * fd based on an endpoint + * @rpdev: prepared rpdev to be used for creating endpoints + * @parent: parent device + * @chinfo: associated endpoint channel information. + * @flag: file flag + * @pfd: fd in represent of endpoint device + * + * This function create a new rpmsg endpoint device and its associated fd to instantiate a new + * endpoint based on chinfo information. + */ +int rpmsg_anonymous_eptdev_create(struct rpmsg_device *rpdev, struct device *parent, + struct rpmsg_channel_info chinfo, unsigned int flags, + int *pfd); + /** * rpmsg_chrdev_eptdev_destroy() - destroy created char device endpoint. * @data: private data associated to the endpoint device @@ -36,6 +52,13 @@ static inline int rpmsg_chrdev_eptdev_create(struct rpmsg_device *rpdev, struct return -ENXIO; } +static inline int rpmsg_anonymous_eptdev_create(struct rpmsg_device *rpdev, struct device *parent, + struct rpmsg_channel_info chinfo, + unsigned int flags, int *pfd) +{ + return -ENXIO; +} + static inline int rpmsg_chrdev_eptdev_destroy(struct device *dev, void *data) { return -ENXIO; -- 2.25.1