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Message-Id: <37ef1646-9b12-2432-62d2-3de52090a004@linux.vnet.ibm.com>
Date: Sun, 6 Nov 2016 19:46:08 -0500
From: Stefan Berger <stefanb@...ux.vnet.ibm.com>
To: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>,
tpmdd-devel@...ts.sourceforge.net
Cc: Peter Huewe <peterhuewe@....de>,
Marcel Selhorst <tpmdd@...horst.net>,
Jason Gunthorpe <jgunthorpe@...idianresearch.com>,
open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/3] tpm, tpm_vtpm_proxy: add kdoc comments for
VTPM_PROXY_IOC_NEW_DEV
On 11/04/2016 11:00 PM, Jarkko Sakkinen wrote:
> On Thu, Nov 03, 2016 at 05:57:50PM -0600, Jarkko Sakkinen wrote:
>> Added kdoc comments for VTPM_PROXY_IOC_NEW_DEV so that these can be
>> imported to the kernel documentation written with rst markup and
>> generated with Sphinx.
>>
>> Signed-off-by: Jarkko Sakkinen <jarkko.sakkinen@...ux.intel.com>
> Stefan, is this OK? Are you willing to give Reviewed-by?
Reviewed-by: Stefan Berger <stefanb@...ux.vnet.ibm.com>
Stefan
>
> /Jarkko
>
>> ---
>> drivers/char/tpm/tpm_vtpm_proxy.c | 72 +++++++++++++++++++++++++--------------
>> include/uapi/linux/vtpm_proxy.h | 23 ++++++++++---
>> 2 files changed, 65 insertions(+), 30 deletions(-)
>>
>> diff --git a/drivers/char/tpm/tpm_vtpm_proxy.c b/drivers/char/tpm/tpm_vtpm_proxy.c
>> index 9a94033..3d6f6ca 100644
>> --- a/drivers/char/tpm/tpm_vtpm_proxy.c
>> +++ b/drivers/char/tpm/tpm_vtpm_proxy.c
>> @@ -1,5 +1,6 @@
>> /*
>> * Copyright (C) 2015, 2016 IBM Corporation
>> + * Copyright (C) 2016 Intel Corporation
>> *
>> * Author: Stefan Berger <stefanb@...ibm.com>
>> *
>> @@ -524,6 +525,50 @@ static void vtpm_proxy_delete_device(struct proxy_dev *proxy_dev)
>> * Code related to the control device /dev/vtpmx
>> */
>>
>> +/**
>> + * vtpmx_ioc_new_dev - handler for the %VTPM_PROXY_IOC_NEW_DEV ioctl
>> + * @file: /dev/vtpmx
>> + * @ioctl: the ioctl number
>> + * @arg: pointer to the struct vtpmx_proxy_new_dev
>> + *
>> + * Creates an anonymous file that is used by the process acting as a TPM to
>> + * communicate with the client processes. The function will also add a new TPM
>> + * device through which data is proxied to this TPM acting process. The caller
>> + * will be provided with a file descriptor to communicate with the clients and
>> + * major and minor numbers for the TPM device.
>> + */
>> +static long vtpmx_ioc_new_dev(struct file *file, unsigned int ioctl,
>> + unsigned long arg)
>> +{
>> + void __user *argp = (void __user *)arg;
>> + struct vtpm_proxy_new_dev __user *vtpm_new_dev_p;
>> + struct vtpm_proxy_new_dev vtpm_new_dev;
>> + struct file *vtpm_file;
>> +
>> + if (!capable(CAP_SYS_ADMIN))
>> + return -EPERM;
>> +
>> + vtpm_new_dev_p = argp;
>> +
>> + if (copy_from_user(&vtpm_new_dev, vtpm_new_dev_p,
>> + sizeof(vtpm_new_dev)))
>> + return -EFAULT;
>> +
>> + vtpm_file = vtpm_proxy_create_device(&vtpm_new_dev);
>> + if (IS_ERR(vtpm_file))
>> + return PTR_ERR(vtpm_file);
>> +
>> + if (copy_to_user(vtpm_new_dev_p, &vtpm_new_dev,
>> + sizeof(vtpm_new_dev))) {
>> + put_unused_fd(vtpm_new_dev.fd);
>> + fput(vtpm_file);
>> + return -EFAULT;
>> + }
>> +
>> + fd_install(vtpm_new_dev.fd, vtpm_file);
>> + return 0;
>> +}
>> +
>> /*
>> * vtpmx_fops_ioctl: ioctl on /dev/vtpmx
>> *
>> @@ -531,34 +576,11 @@ static void vtpm_proxy_delete_device(struct proxy_dev *proxy_dev)
>> * Returns 0 on success, a negative error code otherwise.
>> */
>> static long vtpmx_fops_ioctl(struct file *f, unsigned int ioctl,
>> - unsigned long arg)
>> + unsigned long arg)
>> {
>> - void __user *argp = (void __user *)arg;
>> - struct vtpm_proxy_new_dev __user *vtpm_new_dev_p;
>> - struct vtpm_proxy_new_dev vtpm_new_dev;
>> - struct file *file;
>> -
>> switch (ioctl) {
>> case VTPM_PROXY_IOC_NEW_DEV:
>> - if (!capable(CAP_SYS_ADMIN))
>> - return -EPERM;
>> - vtpm_new_dev_p = argp;
>> - if (copy_from_user(&vtpm_new_dev, vtpm_new_dev_p,
>> - sizeof(vtpm_new_dev)))
>> - return -EFAULT;
>> - file = vtpm_proxy_create_device(&vtpm_new_dev);
>> - if (IS_ERR(file))
>> - return PTR_ERR(file);
>> - if (copy_to_user(vtpm_new_dev_p, &vtpm_new_dev,
>> - sizeof(vtpm_new_dev))) {
>> - put_unused_fd(vtpm_new_dev.fd);
>> - fput(file);
>> - return -EFAULT;
>> - }
>> -
>> - fd_install(vtpm_new_dev.fd, file);
>> - return 0;
>> -
>> + return vtpmx_ioc_new_dev(f, ioctl, arg);
>> default:
>> return -ENOIOCTLCMD;
>> }
>> diff --git a/include/uapi/linux/vtpm_proxy.h b/include/uapi/linux/vtpm_proxy.h
>> index 41e8e22..a69e991 100644
>> --- a/include/uapi/linux/vtpm_proxy.h
>> +++ b/include/uapi/linux/vtpm_proxy.h
>> @@ -1,6 +1,7 @@
>> /*
>> * Definitions for the VTPM proxy driver
>> * Copyright (c) 2015, 2016, IBM Corporation
>> + * Copyright (C) 2016 Intel Corporation
>> *
>> * This program is free software; you can redistribute it and/or modify it
>> * under the terms and conditions of the GNU General Public License,
>> @@ -18,8 +19,23 @@
>> #include <linux/types.h>
>> #include <linux/ioctl.h>
>>
>> -/* ioctls */
>> +/**
>> + * enum vtpm_proxy_flags - flags for the proxy TPM
>> + * @VTPM_PROXY_FLAG_TPM2: the proxy TPM uses TPM 2.0 protocol
>> + */
>> +enum vtpm_proxy_flags {
>> + VTPM_PROXY_FLAG_TPM2 = 1,
>> +};
>>
>> +/**
>> + * struct vtpm_proxy_new_dev - parameter structure for the
>> + * %VTPM_PROXY_IOC_NEW_DEV ioctl
>> + * @flags: flags for the proxy TPM
>> + * @tpm_num: index of the TPM device
>> + * @fd: the file descriptor used by the proxy TPM
>> + * @major: the major number of the TPM device
>> + * @minor: the minor number of the TPM device
>> + */
>> struct vtpm_proxy_new_dev {
>> __u32 flags; /* input */
>> __u32 tpm_num; /* output */
>> @@ -28,9 +44,6 @@ struct vtpm_proxy_new_dev {
>> __u32 minor; /* output */
>> };
>>
>> -/* above flags */
>> -#define VTPM_PROXY_FLAG_TPM2 1 /* emulator is TPM 2 */
>> -
>> -#define VTPM_PROXY_IOC_NEW_DEV _IOWR(0xa1, 0x00, struct vtpm_proxy_new_dev)
>> +#define VTPM_PROXY_IOC_NEW_DEV _IOWR(0xa1, 0x00, struct vtpm_proxy_new_dev)
>>
>> #endif /* _UAPI_LINUX_VTPM_PROXY_H */
>> --
>> 2.9.3
>>
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