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bus: fsl-mc: add fsl-mc userspace support

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Adding userspace support for the MC (Management Complex) means exporting
an ioctl capable device file representing the root resource container.

This new functionality in the fsl-mc bus driver intends to provide
userspace applications an interface to interact with the MC firmware.

Commands that are composed in userspace are sent to the MC firmware
through the FSL_MC_SEND_MC_COMMAND ioctl.  By default the implicit MC
I/O portal is used for this operation, but if the implicit one is busy,
a dynamic portal is allocated and then freed upon execution.

The command received through the ioctl interface is checked against a
known whitelist of accepted MC commands. Commands that attempt a change
in hardware configuration will need CAP_NET_ADMIN, while commands used
in debugging do not need it.

Acked-by: Laurentiu Tudor <laurentiu.tudor@nxp.com>
Signed-off-by: Ioana Ciornei <ioana.ciornei@nxp.com>
Link: https://lore.kernel.org/r/20210114170752.2927915-4-ciorneiioana@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ioana Ciornei 2021-01-14 19:07:50 +02:00 committed by Greg Kroah-Hartman
parent 4670798926
commit 2cf1e703f0
7 changed files with 618 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
Documentation/userspace-api/ioctl/ioctl-number.rst
View File

@ -180,6 +180,7 @@ Code Seq# Include File Comments
'R' 00-1F linux/random.h conflict!
'R' 01 linux/rfkill.h conflict!
'R' C0-DF net/bluetooth/rfcomm.h
'R' E0 uapi/linux/fsl_mc.h
'S' all linux/cdrom.h conflict!
'S' 80-81 scsi/scsi_ioctl.h conflict!
'S' 82-FF scsi/scsi.h conflict!

7
drivers/bus/fsl-mc/Kconfig
View File

@ -14,3 +14,10 @@ config FSL_MC_BUS
architecture. The fsl-mc bus driver handles discovery of
DPAA2 objects (which are represented as Linux devices) and
binding objects to drivers.
config FSL_MC_UAPI_SUPPORT
bool "Management Complex (MC) userspace support"
depends on FSL_MC_BUS
help
Provides userspace support for interrogating, creating, destroying or
configuring DPAA2 objects exported by the Management Complex.

3
drivers/bus/fsl-mc/Makefile
View File

@ -16,3 +16,6 @@ mc-bus-driver-objs := fsl-mc-bus.o \
fsl-mc-allocator.o \
fsl-mc-msi.o \
dpmcp.o
# MC userspace support
obj-$(CONFIG_FSL_MC_UAPI_SUPPORT) += fsl-mc-uapi.o

12
drivers/bus/fsl-mc/dprc-driver.c
View File

@ -603,6 +603,7 @@ int dprc_setup(struct fsl_mc_device *mc_dev)
struct irq_domain *mc_msi_domain;
bool mc_io_created = false;
bool msi_domain_set = false;
bool uapi_created = false;
u16 major_ver, minor_ver;
size_t region_size;
int error;
@ -635,6 +636,11 @@ int dprc_setup(struct fsl_mc_device *mc_dev)
return error;
mc_io_created = true;
} else {
error = fsl_mc_uapi_create_device_file(mc_bus);
if (error < 0)
return -EPROBE_DEFER;
uapi_created = true;
}
mc_msi_domain = fsl_mc_find_msi_domain(&mc_dev->dev);
@ -692,6 +698,9 @@ error_cleanup_msi_domain:
mc_dev->mc_io = NULL;
}
if (uapi_created)
fsl_mc_uapi_remove_device_file(mc_bus);
return error;
}
EXPORT_SYMBOL_GPL(dprc_setup);
@ -763,6 +772,7 @@ static void dprc_teardown_irq(struct fsl_mc_device *mc_dev)
int dprc_cleanup(struct fsl_mc_device *mc_dev)
{
struct fsl_mc_bus *mc_bus = to_fsl_mc_bus(mc_dev);
int error;
/* this function should be called only for DPRCs, it
@ -793,6 +803,8 @@ int dprc_cleanup(struct fsl_mc_device *mc_dev)
if (!fsl_mc_is_root_dprc(&mc_dev->dev)) {
fsl_destroy_mc_io(mc_dev->mc_io);
mc_dev->mc_io = NULL;
} else {
fsl_mc_uapi_remove_device_file(mc_bus);
}
return 0;

39
drivers/bus/fsl-mc/fsl-mc-private.h
View File

@ -10,6 +10,8 @@
#include <linux/fsl/mc.h>
#include <linux/mutex.h>
#include <linux/ioctl.h>
#include <linux/miscdevice.h>
/*
* Data Path Management Complex (DPMNG) General API
@ -542,6 +544,22 @@ struct fsl_mc_resource_pool {
struct fsl_mc_bus *mc_bus;
};
/**
* struct fsl_mc_uapi - information associated with a device file
* @misc: struct miscdevice linked to the root dprc
* @device: newly created device in /dev
* @mutex: mutex lock to serialize the open/release operations
* @local_instance_in_use: local MC I/O instance in use or not
* @static_mc_io: pointer to the static MC I/O object
*/
struct fsl_mc_uapi {
struct miscdevice misc;
struct device *device;
struct mutex mutex; /* serialize open/release operations */
u32 local_instance_in_use;
struct fsl_mc_io *static_mc_io;
};
/**
* struct fsl_mc_bus - logical bus that corresponds to a physical DPRC
* @mc_dev: fsl-mc device for the bus device itself.
@ -551,6 +569,7 @@ struct fsl_mc_resource_pool {
* @irq_resources: Pointer to array of IRQ objects for the IRQ pool
* @scan_mutex: Serializes bus scanning
* @dprc_attr: DPRC attributes
* @uapi_misc: struct that abstracts the interaction with userspace
*/
struct fsl_mc_bus {
struct fsl_mc_device mc_dev;
@ -558,6 +577,7 @@ struct fsl_mc_bus {
struct fsl_mc_device_irq *irq_resources;
struct mutex scan_mutex; /* serializes bus scanning */
struct dprc_attributes dprc_attr;
struct fsl_mc_uapi uapi_misc;
};
#define to_fsl_mc_bus(_mc_dev) \
@ -614,4 +634,23 @@ struct fsl_mc_device *fsl_mc_device_lookup(struct fsl_mc_obj_desc *obj_desc,
u16 mc_cmd_hdr_read_cmdid(struct fsl_mc_command *cmd);
#ifdef CONFIG_FSL_MC_UAPI_SUPPORT
int fsl_mc_uapi_create_device_file(struct fsl_mc_bus *mc_bus);
void fsl_mc_uapi_remove_device_file(struct fsl_mc_bus *mc_bus);
#else
static inline int fsl_mc_uapi_create_device_file(struct fsl_mc_bus *mc_bus)
{
return 0;
}
static inline void fsl_mc_uapi_remove_device_file(struct fsl_mc_bus *mc_bus)
{
}
#endif
#endif /* _FSL_MC_PRIVATE_H_ */

547
drivers/bus/fsl-mc/fsl-mc-uapi.c Normal file
View File

@ -0,0 +1,547 @@
// SPDX-License-Identifier: GPL-2.0
/*
* Management Complex (MC) userspace support
*
* Copyright 2021 NXP
*
*/
#include <linux/slab.h>
#include <linux/fs.h>
#include <linux/uaccess.h>
#include <linux/miscdevice.h>
#include "fsl-mc-private.h"
struct uapi_priv_data {
struct fsl_mc_uapi *uapi;
struct fsl_mc_io *mc_io;
};
struct fsl_mc_cmd_desc {
u16 cmdid_value;
u16 cmdid_mask;
int size;
bool token;
int flags;
};
#define FSL_MC_CHECK_MODULE_ID BIT(0)
#define FSL_MC_CAP_NET_ADMIN_NEEDED BIT(1)
enum fsl_mc_cmd_index {
DPDBG_DUMP = 0,
DPDBG_SET,
DPRC_GET_CONTAINER_ID,
DPRC_CREATE_CONT,
DPRC_DESTROY_CONT,
DPRC_ASSIGN,
DPRC_UNASSIGN,
DPRC_GET_OBJ_COUNT,
DPRC_GET_OBJ,
DPRC_GET_RES_COUNT,
DPRC_GET_RES_IDS,
DPRC_SET_OBJ_LABEL,
DPRC_SET_LOCKED,
DPRC_CONNECT,
DPRC_DISCONNECT,
DPRC_GET_POOL,
DPRC_GET_POOL_COUNT,
DPRC_GET_CONNECTION,
DPCI_GET_LINK_STATE,
DPCI_GET_PEER_ATTR,
DPAIOP_GET_SL_VERSION,
DPAIOP_GET_STATE,
DPMNG_GET_VERSION,
DPSECI_GET_TX_QUEUE,
DPMAC_GET_COUNTER,
DPMAC_GET_MAC_ADDR,
DPNI_SET_PRIM_MAC,
DPNI_GET_PRIM_MAC,
DPNI_GET_STATISTICS,
DPNI_GET_LINK_STATE,
GET_ATTR,
GET_IRQ_MASK,
GET_IRQ_STATUS,
CLOSE,
OPEN,
GET_API_VERSION,
DESTROY,
CREATE,
};
static struct fsl_mc_cmd_desc fsl_mc_accepted_cmds[] = {
[DPDBG_DUMP] = {
.cmdid_value = 0x1300,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 28,
},
[DPDBG_SET] = {
.cmdid_value = 0x1400,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 28,
},
[DPRC_GET_CONTAINER_ID] = {
.cmdid_value = 0x8300,
.cmdid_mask = 0xFFF0,
.token = false,
.size = 8,
},
[DPRC_CREATE_CONT] = {
.cmdid_value = 0x1510,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 40,
.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
},
[DPRC_DESTROY_CONT] = {
.cmdid_value = 0x1520,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 12,
.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
},
[DPRC_ASSIGN] = {
.cmdid_value = 0x1570,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 40,
.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
},
[DPRC_UNASSIGN] = {
.cmdid_value = 0x1580,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 40,
.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
},
[DPRC_GET_OBJ_COUNT] = {
.cmdid_value = 0x1590,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 16,
},
[DPRC_GET_OBJ] = {
.cmdid_value = 0x15A0,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 12,
},
[DPRC_GET_RES_COUNT] = {
.cmdid_value = 0x15B0,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 32,
},
[DPRC_GET_RES_IDS] = {
.cmdid_value = 0x15C0,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 40,
},
[DPRC_SET_OBJ_LABEL] = {
.cmdid_value = 0x1610,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 48,
.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
},
[DPRC_SET_LOCKED] = {
.cmdid_value = 0x16B0,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 16,
.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
},
[DPRC_CONNECT] = {
.cmdid_value = 0x1670,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 56,
.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
},
[DPRC_DISCONNECT] = {
.cmdid_value = 0x1680,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 32,
.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
},
[DPRC_GET_POOL] = {
.cmdid_value = 0x1690,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 12,
},
[DPRC_GET_POOL_COUNT] = {
.cmdid_value = 0x16A0,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 8,
},
[DPRC_GET_CONNECTION] = {
.cmdid_value = 0x16C0,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 32,
},
[DPCI_GET_LINK_STATE] = {
.cmdid_value = 0x0E10,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 8,
},
[DPCI_GET_PEER_ATTR] = {
.cmdid_value = 0x0E20,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 8,
},
[DPAIOP_GET_SL_VERSION] = {
.cmdid_value = 0x2820,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 8,
},
[DPAIOP_GET_STATE] = {
.cmdid_value = 0x2830,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 8,
},
[DPMNG_GET_VERSION] = {
.cmdid_value = 0x8310,
.cmdid_mask = 0xFFF0,
.token = false,
.size = 8,
},
[DPSECI_GET_TX_QUEUE] = {
.cmdid_value = 0x1970,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 14,
},
[DPMAC_GET_COUNTER] = {
.cmdid_value = 0x0c40,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 9,
},
[DPMAC_GET_MAC_ADDR] = {
.cmdid_value = 0x0c50,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 8,
},
[DPNI_SET_PRIM_MAC] = {
.cmdid_value = 0x2240,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 16,
.flags = FSL_MC_CAP_NET_ADMIN_NEEDED,
},
[DPNI_GET_PRIM_MAC] = {
.cmdid_value = 0x2250,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 8,
},
[DPNI_GET_STATISTICS] = {
.cmdid_value = 0x25D0,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 10,
},
[DPNI_GET_LINK_STATE] = {
.cmdid_value = 0x2150,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 8,
},
[GET_ATTR] = {
.cmdid_value = 0x0040,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 8,
},
[GET_IRQ_MASK] = {
.cmdid_value = 0x0150,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 13,
},
[GET_IRQ_STATUS] = {
.cmdid_value = 0x0160,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 13,
},
[CLOSE] = {
.cmdid_value = 0x8000,
.cmdid_mask = 0xFFF0,
.token = true,
.size = 8,
},
/* Common commands amongst all types of objects. Must be checked last. */
[OPEN] = {
.cmdid_value = 0x8000,
.cmdid_mask = 0xFC00,
.token = false,
.size = 12,
.flags = FSL_MC_CHECK_MODULE_ID,
},
[GET_API_VERSION] = {
.cmdid_value = 0xA000,
.cmdid_mask = 0xFC00,
.token = false,
.size = 8,
.flags = FSL_MC_CHECK_MODULE_ID,
},
[DESTROY] = {
.cmdid_value = 0x9800,
.cmdid_mask = 0xFC00,
.token = true,
.size = 12,
.flags = FSL_MC_CHECK_MODULE_ID | FSL_MC_CAP_NET_ADMIN_NEEDED,
},
[CREATE] = {
.cmdid_value = 0x9000,
.cmdid_mask = 0xFC00,
.token = true,
.size = 64,
.flags = FSL_MC_CHECK_MODULE_ID | FSL_MC_CAP_NET_ADMIN_NEEDED,
},
};
#define FSL_MC_NUM_ACCEPTED_CMDS ARRAY_SIZE(fsl_mc_accepted_cmds)
#define FSL_MC_MAX_MODULE_ID 0x10
static int fsl_mc_command_check(struct fsl_mc_device *mc_dev,
struct fsl_mc_command *mc_cmd)
{
struct fsl_mc_cmd_desc *desc = NULL;
int mc_cmd_max_size, i;
bool token_provided;
u16 cmdid, module_id;
char *mc_cmd_end;
char sum = 0;
/* Check if this is an accepted MC command */
cmdid = mc_cmd_hdr_read_cmdid(mc_cmd);
for (i = 0; i < FSL_MC_NUM_ACCEPTED_CMDS; i++) {
desc = &fsl_mc_accepted_cmds[i];
if ((cmdid & desc->cmdid_mask) == desc->cmdid_value)
break;
}
if (!desc) {
dev_err(&mc_dev->dev, "MC command 0x%04x: cmdid not accepted\n", cmdid);
return -EACCES;
}
/* Check if the size of the command is honored. Anything beyond the
* last valid byte of the command should be zeroed.
*/
mc_cmd_max_size = sizeof(*mc_cmd);
mc_cmd_end = ((char *)mc_cmd) + desc->size;
for (i = desc->size; i < mc_cmd_max_size; i++)
sum |= *mc_cmd_end++;
if (sum) {
dev_err(&mc_dev->dev, "MC command 0x%04x: garbage beyond max size of %d bytes!\n",
cmdid, desc->size);
return -EACCES;
}
/* Some MC commands request a token to be passed so that object
* identification is possible. Check if the token passed in the command
* is as expected.
*/
token_provided = mc_cmd_hdr_read_token(mc_cmd) ? true : false;
if (token_provided != desc->token) {
dev_err(&mc_dev->dev, "MC command 0x%04x: token 0x%04x is invalid!\n",
cmdid, mc_cmd_hdr_read_token(mc_cmd));
return -EACCES;
}
/* If needed, check if the module ID passed is valid */
if (desc->flags & FSL_MC_CHECK_MODULE_ID) {
/* The module ID is represented by bits [4:9] from the cmdid */
module_id = (cmdid & GENMASK(9, 4)) >> 4;
if (module_id == 0 || module_id > FSL_MC_MAX_MODULE_ID) {
dev_err(&mc_dev->dev, "MC command 0x%04x: unknown module ID 0x%x\n",
cmdid, module_id);
return -EACCES;
}
}
/* Some commands alter how hardware resources are managed. For these
* commands, check for CAP_NET_ADMIN.
*/
if (desc->flags & FSL_MC_CAP_NET_ADMIN_NEEDED) {
if (!capable(CAP_NET_ADMIN)) {
dev_err(&mc_dev->dev, "MC command 0x%04x: needs CAP_NET_ADMIN!\n",
cmdid);
return -EPERM;
}
}
return 0;
}
static int fsl_mc_uapi_send_command(struct fsl_mc_device *mc_dev, unsigned long arg,
struct fsl_mc_io *mc_io)
{
struct fsl_mc_command mc_cmd;
int error;
error = copy_from_user(&mc_cmd, (void __user *)arg, sizeof(mc_cmd));
if (error)
return -EFAULT;
error = fsl_mc_command_check(mc_dev, &mc_cmd);
if (error)
return error;
error = mc_send_command(mc_io, &mc_cmd);
if (error)
return error;
error = copy_to_user((void __user *)arg, &mc_cmd, sizeof(mc_cmd));
if (error)
return -EFAULT;
return 0;
}
static int fsl_mc_uapi_dev_open(struct inode *inode, struct file *filep)
{
struct fsl_mc_device *root_mc_device;
struct uapi_priv_data *priv_data;
struct fsl_mc_io *dynamic_mc_io;
struct fsl_mc_uapi *mc_uapi;
struct fsl_mc_bus *mc_bus;
int error;
priv_data = kzalloc(sizeof(*priv_data), GFP_KERNEL);
if (!priv_data)
return -ENOMEM;
mc_uapi = container_of(filep->private_data, struct fsl_mc_uapi, misc);
mc_bus = container_of(mc_uapi, struct fsl_mc_bus, uapi_misc);
root_mc_device = &mc_bus->mc_dev;
mutex_lock(&mc_uapi->mutex);
if (!mc_uapi->local_instance_in_use) {
priv_data->mc_io = mc_uapi->static_mc_io;
mc_uapi->local_instance_in_use = 1;
} else {
error = fsl_mc_portal_allocate(root_mc_device, 0,
&dynamic_mc_io);
if (error) {
dev_dbg(&root_mc_device->dev,
"Could not allocate MC portal\n");
goto error_portal_allocate;
}
priv_data->mc_io = dynamic_mc_io;
}
priv_data->uapi = mc_uapi;
filep->private_data = priv_data;
mutex_unlock(&mc_uapi->mutex);
return 0;
error_portal_allocate:
mutex_unlock(&mc_uapi->mutex);
kfree(priv_data);
return error;
}
static int fsl_mc_uapi_dev_release(struct inode *inode, struct file *filep)
{
struct uapi_priv_data *priv_data;
struct fsl_mc_uapi *mc_uapi;
struct fsl_mc_io *mc_io;
priv_data = filep->private_data;
mc_uapi = priv_data->uapi;
mc_io = priv_data->mc_io;
mutex_lock(&mc_uapi->mutex);
if (mc_io == mc_uapi->static_mc_io)
mc_uapi->local_instance_in_use = 0;
else
fsl_mc_portal_free(mc_io);
kfree(filep->private_data);
filep->private_data = NULL;
mutex_unlock(&mc_uapi->mutex);
return 0;
}
static long fsl_mc_uapi_dev_ioctl(struct file *file,
unsigned int cmd,
unsigned long arg)
{
struct uapi_priv_data *priv_data = file->private_data;
struct fsl_mc_device *root_mc_device;
struct fsl_mc_bus *mc_bus;
int error;
mc_bus = container_of(priv_data->uapi, struct fsl_mc_bus, uapi_misc);
root_mc_device = &mc_bus->mc_dev;
switch (cmd) {
case FSL_MC_SEND_MC_COMMAND:
error = fsl_mc_uapi_send_command(root_mc_device, arg, priv_data->mc_io);
break;
default:
dev_dbg(&root_mc_device->dev, "unexpected ioctl call number\n");
error = -EINVAL;
}
return error;
}
static const struct file_operations fsl_mc_uapi_dev_fops = {
.owner = THIS_MODULE,
.open = fsl_mc_uapi_dev_open,
.release = fsl_mc_uapi_dev_release,
.unlocked_ioctl = fsl_mc_uapi_dev_ioctl,
};
int fsl_mc_uapi_create_device_file(struct fsl_mc_bus *mc_bus)
{
struct fsl_mc_device *mc_dev = &mc_bus->mc_dev;
struct fsl_mc_uapi *mc_uapi = &mc_bus->uapi_misc;
int error;
mc_uapi->misc.minor = MISC_DYNAMIC_MINOR;
mc_uapi->misc.name = dev_name(&mc_dev->dev);
mc_uapi->misc.fops = &fsl_mc_uapi_dev_fops;
error = misc_register(&mc_uapi->misc);
if (error)
return error;
mc_uapi->static_mc_io = mc_bus->mc_dev.mc_io;
mutex_init(&mc_uapi->mutex);
return 0;
}
void fsl_mc_uapi_remove_device_file(struct fsl_mc_bus *mc_bus)
{
misc_deregister(&mc_bus->uapi_misc.misc);
}

9
include/uapi/linux/fsl_mc.h
View File

@ -16,10 +16,19 @@
* struct fsl_mc_command - Management Complex (MC) command structure
* @header: MC command header
* @params: MC command parameters
*
* Used by FSL_MC_SEND_MC_COMMAND
*/
struct fsl_mc_command {
__le64 header;
__le64 params[MC_CMD_NUM_OF_PARAMS];
};
#define FSL_MC_SEND_CMD_IOCTL_TYPE 'R'
#define FSL_MC_SEND_CMD_IOCTL_SEQ 0xE0
#define FSL_MC_SEND_MC_COMMAND \
_IOWR(FSL_MC_SEND_CMD_IOCTL_TYPE, FSL_MC_SEND_CMD_IOCTL_SEQ, \
struct fsl_mc_command)
#endif /* _UAPI_FSL_MC_H_ */