From nobody Mon Dec 15 21:49:00 2025 Received: from out-170.mta1.migadu.com (out-170.mta1.migadu.com [95.215.58.170]) (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 C80BC2FB985 for ; Wed, 15 Oct 2025 15:19:15 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.170 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760541559; cv=none; b=gyuYOjA6CzKRndFrivAWn90fwpLVE0yny8PFZcu0gBwGwaHzrRwhKpqtvHNbGvjCneZYDPlpOZ4Boe5eOF3OeAWyR6vAcBh+GS//nR/isDO6g3qBouCwTLdSyRNQtvn5E0halw+RlRUNxRvK3Po+Nl7N1O3CbhsIT7oGr9uej7I= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1760541559; c=relaxed/simple; bh=a9xKhDk+BGtJ4JiaTrGo1b0mvMJxDoS0zpI5Gu5pD4Q=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=u3E/Yj+h2fD1f2CU1/dMDNUts100TpiRjXPeA/r6lmLrplBi1kB8De+H8p0vzt4K+3xUZqMmyWiol/oOYaI+BkRX+5roIR+fVdZJdf+FpJ2I6QjBjmhFSxgBnKgJ+KC/xvv45g+9Swwk1DL7NKkz5nCK3BWpRGZE4o01ECEJryw= 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=udULT81v; arc=none smtp.client-ip=95.215.58.170 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="udULT81v" 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=1760541553; 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=FSAoHN+I0q5gvwL07/+w9FpvcidtI68SZ5LkGFNNr6w=; b=udULT81vHIEVtIBF5XvtutmVrlGPzNupoyXCUuAEkSjJ5KIHh+zFjEWykswdr5yVjG9eAv S2y3mltUcBCzV9/DoUrxNsqRQtreuXr4DGXKGSwGIkjWff9qBg0OHS/MKV/rZEW9VL59DF c2ZDhOOd2eIZ1QLTvCqFHicpK3drHjk= 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 v5 3/3] rpmsg: ctrl: Introduce RPMSG_CREATE_EPT_FD_IOCTL uAPI Date: Wed, 15 Oct 2025 23:17:18 +0800 Message-Id: <20251015151718.3927-4-dawei.li@linux.dev> In-Reply-To: <20251015151718.3927-1-dawei.li@linux.dev> References: <20251015151718.3927-1-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: quoted-printable X-Migadu-Flow: FLOW_OUT Content-Type: text/plain; charset="utf-8" Implement RPMSG_CREATE_EPT_FD_IOCTL, new uAPI for rpmsg ctrl, which shares most of operations of RPMSG_CREATE_EPT_IOCTL except that it returns fd representing eptdev to userspace directly. Possible calling procedures for userspace are: - fd =3D open("/dev/rpmsg_ctrlX") - ioctl(fd, RPMSG_CREATE_EPT_FD_IOCTL, &info); - fd_ep =3D info.fd - operations on fd_ep(write, read, poll ioctl) - ioctl(fd_ep, RPMSG_DESTROY_EPT_IOCTL) - close(fd_ep) - close(fd) Signed-off-by: Dawei Li --- drivers/rpmsg/rpmsg_ctrl.c | 35 ++++++++++++++++++++++++++++------- include/uapi/linux/rpmsg.h | 27 ++++++++++++++++++++++++++- 2 files changed, 54 insertions(+), 8 deletions(-) diff --git a/drivers/rpmsg/rpmsg_ctrl.c b/drivers/rpmsg/rpmsg_ctrl.c index 28f57945ccd9..efb207506e5c 100644 --- a/drivers/rpmsg/rpmsg_ctrl.c +++ b/drivers/rpmsg/rpmsg_ctrl.c @@ -75,19 +75,30 @@ static long rpmsg_ctrldev_ioctl(struct file *fp, unsign= ed int cmd, unsigned long arg) { struct rpmsg_ctrldev *ctrldev =3D fp->private_data; + struct rpmsg_endpoint_fd_info ept_fd_info; void __user *argp =3D (void __user *)arg; struct rpmsg_endpoint_info eptinfo; struct rpmsg_channel_info chinfo; struct rpmsg_device *rpdev; int ret =3D 0; =20 - if (copy_from_user(&eptinfo, argp, sizeof(eptinfo))) - return -EFAULT; - - memcpy(chinfo.name, eptinfo.name, RPMSG_NAME_SIZE); - chinfo.name[RPMSG_NAME_SIZE - 1] =3D '\0'; - chinfo.src =3D eptinfo.src; - chinfo.dst =3D eptinfo.dst; + if (cmd =3D=3D RPMSG_CREATE_EPT_FD_IOCTL) { + if (copy_from_user(&ept_fd_info, argp, sizeof(ept_fd_info))) + return -EFAULT; + + memcpy(chinfo.name, ept_fd_info.name, RPMSG_NAME_SIZE); + chinfo.name[RPMSG_NAME_SIZE - 1] =3D '\0'; + chinfo.src =3D ept_fd_info.src; + chinfo.dst =3D ept_fd_info.dst; + } else { + if (copy_from_user(&eptinfo, argp, sizeof(eptinfo))) + return -EFAULT; + + memcpy(chinfo.name, eptinfo.name, RPMSG_NAME_SIZE); + chinfo.name[RPMSG_NAME_SIZE - 1] =3D '\0'; + chinfo.src =3D eptinfo.src; + chinfo.dst =3D eptinfo.dst; + } =20 mutex_lock(&ctrldev->ctrl_lock); switch (cmd) { @@ -110,6 +121,16 @@ static long rpmsg_ctrldev_ioctl(struct file *fp, unsig= ned int cmd, chinfo.name, ret); break; =20 + case RPMSG_CREATE_EPT_FD_IOCTL: + ret =3D rpmsg_anonymous_eptdev_create(ctrldev->rpdev, &ctrldev->dev, chi= nfo, + ept_fd_info.flags, &ept_fd_info.fd); + if (ret) + break; + + if (copy_to_user(argp, &ept_fd_info, sizeof(ept_fd_info))) + ret =3D -EFAULT; + break; + default: ret =3D -EINVAL; } diff --git a/include/uapi/linux/rpmsg.h b/include/uapi/linux/rpmsg.h index f0c8da2b185b..02befb298f71 100644 --- a/include/uapi/linux/rpmsg.h +++ b/include/uapi/linux/rpmsg.h @@ -29,7 +29,8 @@ struct rpmsg_endpoint_info { #define RPMSG_CREATE_EPT_IOCTL _IOW(0xb5, 0x1, struct rpmsg_endpoint_info) =20 /** - * Destroy a rpmsg char device endpoint created by the RPMSG_CREATE_EPT_IO= CTL. + * Destroy a rpmsg char device endpoint created by the RPMSG_CREATE_EPT_IO= CTL + * or RPMSG_CREATE_EPT_FD_IOCTL. */ #define RPMSG_DESTROY_EPT_IOCTL _IO(0xb5, 0x2) =20 @@ -53,4 +54,28 @@ struct rpmsg_endpoint_info { */ #define RPMSG_SET_INCOMING_FLOWCONTROL _IOR(0xb5, 0x6, int) =20 +/** + * struct rpmsg_endpoint_fd_info - endpoint & fd info representation + * @name: name of service + * @src: local address. To set to RPMSG_ADDR_ANY if not used. + * @dst: destination address. To set to RPMSG_ADDR_ANY if not used. + * @flags: file flags of endpoint device, valid flags: + * O_RDONLY/O_WRONLY/O_RDWR + * O_NONBLOCK + * O_CLOEXEC + * @fd: fd returned from driver + */ +struct rpmsg_endpoint_fd_info { + char name[32]; + __u32 src; + __u32 dst; + __u32 flags; + __s32 fd; +}; + +/** + * Instantiate a new rmpsg endpoint which is represented by fd + */ +#define RPMSG_CREATE_EPT_FD_IOCTL _IOWR(0xb5, 0x7, struct rpmsg_endpoint_f= d_info) + #endif --=20 2.25.1