From nobody Thu Dec 18 07:10:29 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 8C1A1200D8 for ; Wed, 7 Feb 2024 07:28:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707290907; cv=none; b=EHYZTLJIoD8HTxkQD1GMn0JVfDXC6EpdACujMVBOCnogPGJ226Q18rdiRzGks7JjVhzFDcNHdr2fUupsq9VftZRb1ccPgmLSM9wEeWvUBqdvKaUn6uTiOpUX6+hdSpL6d69/1QaIh1QhW1cDsCZbNago1qbZ+SYbv9Sgm+TjL6o= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1707290907; c=relaxed/simple; bh=HJ8IhDMnRtXRcH7QQWNi/3y6XYnFHwSd1H1sIxy1Luo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=uJ4FTg4lFYiDuCvaCAFSW7uNaMBSRUEwT5ZSieFuLz4FBA69l4La8O/gy2nHeWGVNOcKP0O2qiWvTuqzZJTkTYw9XKIMsAp0DnkknJOwfBK9rmxoWIEIhckxeZmtVCUblNNe2PrEQasuqdIiKKyMfIhadQ7lWm38HlDeKS4zcCo= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=g3bolgMW; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="g3bolgMW" Received: by smtp.kernel.org (Postfix) with ESMTPSA id E6BE8C433F1; Wed, 7 Feb 2024 07:28:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1707290907; bh=HJ8IhDMnRtXRcH7QQWNi/3y6XYnFHwSd1H1sIxy1Luo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=g3bolgMWjULeKQeo+0Oa9LrdecwhDRU38coASeGAR3jLmh6ZBKfnbaIj1VQebVm0C W0Dw5FE4WeUfIJM28Lx0LFaw7OhhcEFLWfU3pjTA3XWt9jlQ6HRwoPsVoApPDI4eHt MtZWzItScs3bZsCm5PfckL3/XkiyapCnCVMWZnIM7hIyLSStwyXdXbVVWd99yfCcOK mGjicbOdj5bPpDYp5wX0SVPn3MRNC7QaH/PmlBP3naTXwmKDyankEMQ3SI+aYWFYB8 tzj5F81DEJ4XS9fSZIoHZjKXhM50eS+olG9L/oAntJygN3YLG3XA7WuSP7rYErR41e G3s0BVw8o31sw== From: Saeed Mahameed To: Arnd Bergmann , Greg Kroah-Hartman Cc: Leon Romanovsky , Jason Gunthorpe , Jiri Pirko , Leonid Bloch , Itay Avraham , Jakub Kicinski , Saeed Mahameed , David Ahern , Aron Silverton , Christoph Hellwig , andrew.gospodarek@broadcom.com, linux-kernel@vger.kernel.org Subject: [PATCH V4 3/5] misc: mlx5ctl: Add info ioctl Date: Tue, 6 Feb 2024 23:24:33 -0800 Message-ID: <20240207072435.14182-4-saeed@kernel.org> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240207072435.14182-1-saeed@kernel.org> References: <20240207072435.14182-1-saeed@kernel.org> 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 Content-Type: text/plain; charset="utf-8" From: Saeed Mahameed Implement INFO ioctl to return the allocated UID and the capability flags and some other useful device information. Example: $ sudo ./mlx5ctl mlx5_core.ctl.0 UCTX UID: 1 UCTX CAP: 0x3 DEV UCTX CAP: 0x3 USER CAP: 0x1d Reviewed-by: Jiri Pirko Reviewed-by: Leon Romanovsky Reviewed-by: Jason Gunthorpe Signed-off-by: Saeed Mahameed --- .../userspace-api/ioctl/ioctl-number.rst | 1 + drivers/misc/mlx5ctl/main.c | 68 +++++++++++++++++++ include/uapi/misc/mlx5ctl.h | 20 ++++++ 3 files changed, 89 insertions(+) create mode 100644 include/uapi/misc/mlx5ctl.h diff --git a/Documentation/userspace-api/ioctl/ioctl-number.rst b/Documenta= tion/userspace-api/ioctl/ioctl-number.rst index 457e16f06e04..17e6ab6d0d9f 100644 --- a/Documentation/userspace-api/ioctl/ioctl-number.rst +++ b/Documentation/userspace-api/ioctl/ioctl-number.rst @@ -89,6 +89,7 @@ Code Seq# Include File = Comments 0x20 all drivers/cdrom/cm206.h 0x22 all scsi/sg.h 0x3E 00-0F linux/counter.h +0x5c all uapi/misc/mlx5ctl.h Nvidi= a ConnectX control '!' 00-1F uapi/linux/seccomp.h '#' 00-3F IEEE = 1394 Subsystem Block= for the entire subsystem diff --git a/drivers/misc/mlx5ctl/main.c b/drivers/misc/mlx5ctl/main.c index 314aeb45bb8e..e4e70359dbe8 100644 --- a/drivers/misc/mlx5ctl/main.c +++ b/drivers/misc/mlx5ctl/main.c @@ -8,6 +8,7 @@ #include #include #include +#include #include #include =20 @@ -214,10 +215,77 @@ static int mlx5ctl_release(struct inode *inode, struc= t file *file) return 0; } =20 +static int mlx5ctl_info_ioctl(struct file *file, + struct mlx5ctl_info __user *arg, + size_t usize) +{ + struct mlx5ctl_fd *mfd =3D file->private_data; + size_t ksize =3D sizeof(struct mlx5ctl_info); + struct mlx5ctl_dev *mcdev =3D mfd->mcdev; + struct mlx5_core_dev *mdev =3D mcdev->mdev; + struct mlx5ctl_info *info; + int err =3D 0; + + if (usize < ksize) + return -EINVAL; + + info =3D kzalloc(ksize, GFP_KERNEL); + if (!info) + return -ENOMEM; + + info->dev_uctx_cap =3D MLX5_CAP_GEN(mdev, uctx_cap); + info->uctx_cap =3D mfd->uctx_cap; + info->uctx_uid =3D mfd->uctx_uid; + info->ucap =3D mfd->ucap; + + if (copy_to_user(arg, info, ksize)) + err =3D -EFAULT; + + kfree(info); + return err; +} + +static long mlx5ctl_ioctl(struct file *file, unsigned int cmd, unsigned lo= ng arg) +{ + struct mlx5ctl_fd *mfd =3D file->private_data; + struct mlx5ctl_dev *mcdev =3D mfd->mcdev; + void __user *argp =3D (void __user *)arg; + size_t size =3D _IOC_SIZE(cmd); + int err =3D 0; + + if (!capable(CAP_SYS_ADMIN)) + return -EPERM; + + mlx5ctl_dbg(mcdev, "ioctl 0x%x type/nr: %d/%d size: %d DIR:%d\n", cmd, + _IOC_TYPE(cmd), _IOC_NR(cmd), _IOC_SIZE(cmd), _IOC_DIR(cmd)); + + down_read(&mcdev->rw_lock); + if (!mcdev->mdev) { + err =3D -ENODEV; + goto unlock; + } + + switch (cmd) { + case MLX5CTL_IOCTL_INFO: + err =3D mlx5ctl_info_ioctl(file, argp, size); + break; + + default: + mlx5ctl_dbg(mcdev, "Unknown ioctl %x\n", cmd); + err =3D -ENOTTY; + break; + } +unlock: + up_read(&mcdev->rw_lock); + return err; +} + static const struct file_operations mlx5ctl_fops =3D { .owner =3D THIS_MODULE, .open =3D mlx5ctl_open, .release =3D mlx5ctl_release, + .unlocked_ioctl =3D mlx5ctl_ioctl, + .compat_ioctl =3D compat_ptr_ioctl, }; =20 static int mlx5ctl_probe(struct auxiliary_device *adev, diff --git a/include/uapi/misc/mlx5ctl.h b/include/uapi/misc/mlx5ctl.h new file mode 100644 index 000000000000..9be944128025 --- /dev/null +++ b/include/uapi/misc/mlx5ctl.h @@ -0,0 +1,20 @@ +/* SPDX-License-Identifier: BSD-3-Clause OR GPL-2.0 WITH Linux-syscall-not= e */ +/* Copyright (c) 2023, NVIDIA CORPORATION & AFFILIATES. All rights reserve= d. */ + +#ifndef __MLX5CTL_IOCTL_H__ +#define __MLX5CTL_IOCTL_H__ + +struct mlx5ctl_info { + __u16 uctx_uid; /* current process allocated UCTX UID */ + __u16 reserved1; /* explicit padding must be zero */ + __u32 uctx_cap; /* current process effective UCTX cap */ + __u32 dev_uctx_cap; /* device's UCTX capabilities */ + __u32 ucap; /* process user capability */ +}; + +#define MLX5CTL_IOCTL_MAGIC 0x5c + +#define MLX5CTL_IOCTL_INFO \ + _IOR(MLX5CTL_IOCTL_MAGIC, 0x0, struct mlx5ctl_info) + +#endif /* __MLX5CTL_IOCTL_H__ */ --=20 2.43.0