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linux/drivers/misc/sgi-xp/xp.h
Kees Cook 234041dfe5 sgi-xp: Use designated initializers 
Prepare to mark sensitive kernel structures for randomization by making
sure they're using designated initializers. In this case, no initializers
are needed (they can be NULL initialized and callers adjusted to check
for NULL, which is more efficient than an indirect call).

Cc: Robin Holt <robinmholt@gmail.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Reviewed-by: Christoph Hellwig <hch@infradead.org>
2017-05-28 10:22:42 -07:00

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/*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file "COPYING" in the main directory of this archive
* for more details.
*
* Copyright (C) 2004-2008 Silicon Graphics, Inc. All rights reserved.
*/
/*
* External Cross Partition (XP) structures and defines.
*/
#ifndef _DRIVERS_MISC_SGIXP_XP_H
#define _DRIVERS_MISC_SGIXP_XP_H
#include <linux/mutex.h>
#if defined CONFIG_X86_UV || defined CONFIG_IA64_SGI_UV
#include <asm/uv/uv.h>
#define is_uv() is_uv_system()
#endif
#ifndef is_uv
#define is_uv() 0
#endif
#if defined CONFIG_IA64
#include <asm/sn/arch.h> /* defines is_shub1() and is_shub2() */
#define is_shub() ia64_platform_is("sn2")
#endif
#ifndef is_shub1
#define is_shub1() 0
#endif
#ifndef is_shub2
#define is_shub2() 0
#endif
#ifndef is_shub
#define is_shub() 0
#endif
#ifdef USE_DBUG_ON
#define DBUG_ON(condition) BUG_ON(condition)
#else
#define DBUG_ON(condition)
#endif
/*
* Define the maximum number of partitions the system can possibly support.
* It is based on the maximum number of hardware partitionable regions. The
* term 'region' in this context refers to the minimum number of nodes that
* can comprise an access protection grouping. The access protection is in
* regards to memory, IPI and IOI.
*
* The maximum number of hardware partitionable regions is equal to the
* maximum number of nodes in the entire system divided by the minimum number
* of nodes that comprise an access protection grouping.
*/
#define XP_MAX_NPARTITIONS_SN2 64
#define XP_MAX_NPARTITIONS_UV 256
/*
* XPC establishes channel connections between the local partition and any
* other partition that is currently up. Over these channels, kernel-level
* `users' can communicate with their counterparts on the other partitions.
*
* If the need for additional channels arises, one can simply increase
* XPC_MAX_NCHANNELS accordingly. If the day should come where that number
* exceeds the absolute MAXIMUM number of channels possible (eight), then one
* will need to make changes to the XPC code to accommodate for this.
*
* The absolute maximum number of channels possible is limited to eight for
* performance reasons on sn2 hardware. The internal cross partition structures
* require sixteen bytes per channel, and eight allows all of this
* interface-shared info to fit in one 128-byte cacheline.
*/
#define XPC_MEM_CHANNEL 0 /* memory channel number */
#define XPC_NET_CHANNEL 1 /* network channel number */
#define XPC_MAX_NCHANNELS 2 /* max #of channels allowed */
#if XPC_MAX_NCHANNELS > 8
#error XPC_MAX_NCHANNELS exceeds absolute MAXIMUM possible.
#endif
/*
* Define macro, XPC_MSG_SIZE(), is provided for the user
* that wants to fit as many msg entries as possible in a given memory size
* (e.g. a memory page).
*/
#define XPC_MSG_MAX_SIZE 128
#define XPC_MSG_HDR_MAX_SIZE 16
#define XPC_MSG_PAYLOAD_MAX_SIZE (XPC_MSG_MAX_SIZE - XPC_MSG_HDR_MAX_SIZE)
#define XPC_MSG_SIZE(_payload_size) \
ALIGN(XPC_MSG_HDR_MAX_SIZE + (_payload_size), \
is_uv() ? 64 : 128)
/*
* Define the return values and values passed to user's callout functions.
* (It is important to add new value codes at the end just preceding
* xpUnknownReason, which must have the highest numerical value.)
*/
enum xp_retval {
xpSuccess = 0,
xpNotConnected, /* 1: channel is not connected */
xpConnected, /* 2: channel connected (opened) */
xpRETIRED1, /* 3: (formerly xpDisconnected) */
xpMsgReceived, /* 4: message received */
xpMsgDelivered, /* 5: message delivered and acknowledged */
xpRETIRED2, /* 6: (formerly xpTransferFailed) */
xpNoWait, /* 7: operation would require wait */
xpRetry, /* 8: retry operation */
xpTimeout, /* 9: timeout in xpc_allocate_msg_wait() */
xpInterrupted, /* 10: interrupted wait */
xpUnequalMsgSizes, /* 11: message size disparity between sides */
xpInvalidAddress, /* 12: invalid address */
xpNoMemory, /* 13: no memory available for XPC structures */
xpLackOfResources, /* 14: insufficient resources for operation */
xpUnregistered, /* 15: channel is not registered */
xpAlreadyRegistered, /* 16: channel is already registered */
xpPartitionDown, /* 17: remote partition is down */
xpNotLoaded, /* 18: XPC module is not loaded */
xpUnloading, /* 19: this side is unloading XPC module */
xpBadMagic, /* 20: XPC MAGIC string not found */
xpReactivating, /* 21: remote partition was reactivated */
xpUnregistering, /* 22: this side is unregistering channel */
xpOtherUnregistering, /* 23: other side is unregistering channel */
xpCloneKThread, /* 24: cloning kernel thread */
xpCloneKThreadFailed, /* 25: cloning kernel thread failed */
xpNoHeartbeat, /* 26: remote partition has no heartbeat */
xpPioReadError, /* 27: PIO read error */
xpPhysAddrRegFailed, /* 28: registration of phys addr range failed */
xpRETIRED3, /* 29: (formerly xpBteDirectoryError) */
xpRETIRED4, /* 30: (formerly xpBtePoisonError) */
xpRETIRED5, /* 31: (formerly xpBteWriteError) */
xpRETIRED6, /* 32: (formerly xpBteAccessError) */
xpRETIRED7, /* 33: (formerly xpBtePWriteError) */
xpRETIRED8, /* 34: (formerly xpBtePReadError) */
xpRETIRED9, /* 35: (formerly xpBteTimeOutError) */
xpRETIRED10, /* 36: (formerly xpBteXtalkError) */
xpRETIRED11, /* 37: (formerly xpBteNotAvailable) */
xpRETIRED12, /* 38: (formerly xpBteUnmappedError) */
xpBadVersion, /* 39: bad version number */
xpVarsNotSet, /* 40: the XPC variables are not set up */
xpNoRsvdPageAddr, /* 41: unable to get rsvd page's phys addr */
xpInvalidPartid, /* 42: invalid partition ID */
xpLocalPartid, /* 43: local partition ID */
xpOtherGoingDown, /* 44: other side going down, reason unknown */
xpSystemGoingDown, /* 45: system is going down, reason unknown */
xpSystemHalt, /* 46: system is being halted */
xpSystemReboot, /* 47: system is being rebooted */
xpSystemPoweroff, /* 48: system is being powered off */
xpDisconnecting, /* 49: channel disconnecting (closing) */
xpOpenCloseError, /* 50: channel open/close protocol error */
xpDisconnected, /* 51: channel disconnected (closed) */
xpBteCopyError, /* 52: bte_copy() returned error */
xpSalError, /* 53: sn SAL error */
xpRsvdPageNotSet, /* 54: the reserved page is not set up */
xpPayloadTooBig, /* 55: payload too large for message slot */
xpUnsupported, /* 56: unsupported functionality or resource */
xpNeedMoreInfo, /* 57: more info is needed by SAL */
xpGruCopyError, /* 58: gru_copy_gru() returned error */
xpGruSendMqError, /* 59: gru send message queue related error */
xpBadChannelNumber, /* 60: invalid channel number */
xpBadMsgType, /* 61: invalid message type */
xpBiosError, /* 62: BIOS error */
xpUnknownReason /* 63: unknown reason - must be last in enum */
};
/*
* Define the callout function type used by XPC to update the user on
* connection activity and state changes via the user function registered
* by xpc_connect().
*
* Arguments:
*
* reason - reason code.
* partid - partition ID associated with condition.
* ch_number - channel # associated with condition.
* data - pointer to optional data.
* key - pointer to optional user-defined value provided as the "key"
* argument to xpc_connect().
*
* A reason code of xpConnected indicates that a connection has been
* established to the specified partition on the specified channel. The data
* argument indicates the max number of entries allowed in the message queue.
*
* A reason code of xpMsgReceived indicates that a XPC message arrived from
* the specified partition on the specified channel. The data argument
* specifies the address of the message's payload. The user must call
* xpc_received() when finished with the payload.
*
* All other reason codes indicate failure. The data argmument is NULL.
* When a failure reason code is received, one can assume that the channel
* is not connected.
*/
typedef void (*xpc_channel_func) (enum xp_retval reason, short partid,
int ch_number, void *data, void *key);
/*
* Define the callout function type used by XPC to notify the user of
* messages received and delivered via the user function registered by
* xpc_send_notify().
*
* Arguments:
*
* reason - reason code.
* partid - partition ID associated with condition.
* ch_number - channel # associated with condition.
* key - pointer to optional user-defined value provided as the "key"
* argument to xpc_send_notify().
*
* A reason code of xpMsgDelivered indicates that the message was delivered
* to the intended recipient and that they have acknowledged its receipt by
* calling xpc_received().
*
* All other reason codes indicate failure.
*
* NOTE: The user defined function must be callable by an interrupt handler
* and thus cannot block.
*/
typedef void (*xpc_notify_func) (enum xp_retval reason, short partid,
int ch_number, void *key);
/*
* The following is a registration entry. There is a global array of these,
* one per channel. It is used to record the connection registration made
* by the users of XPC. As long as a registration entry exists, for any
* partition that comes up, XPC will attempt to establish a connection on
* that channel. Notification that a connection has been made will occur via
* the xpc_channel_func function.
*
* The 'func' field points to the function to call when aynchronous
* notification is required for such events as: a connection established/lost,
* or an incoming message received, or an error condition encountered. A
* non-NULL 'func' field indicates that there is an active registration for
* the channel.
*/
struct xpc_registration {
struct mutex mutex;
xpc_channel_func func; /* function to call */
void *key; /* pointer to user's key */
u16 nentries; /* #of msg entries in local msg queue */
u16 entry_size; /* message queue's message entry size */
u32 assigned_limit; /* limit on #of assigned kthreads */
u32 idle_limit; /* limit on #of idle kthreads */
} ____cacheline_aligned;
#define XPC_CHANNEL_REGISTERED(_c) (xpc_registrations[_c].func != NULL)
/* the following are valid xpc_send() or xpc_send_notify() flags */
#define XPC_WAIT 0 /* wait flag */
#define XPC_NOWAIT 1 /* no wait flag */
struct xpc_interface {
void (*connect) (int);
void (*disconnect) (int);
enum xp_retval (*send) (short, int, u32, void *, u16);
enum xp_retval (*send_notify) (short, int, u32, void *, u16,
xpc_notify_func, void *);
void (*received) (short, int, void *);
enum xp_retval (*partid_to_nasids) (short, void *);
};
extern struct xpc_interface xpc_interface;
extern void xpc_set_interface(void (*)(int),
void (*)(int),
enum xp_retval (*)(short, int, u32, void *, u16),
enum xp_retval (*)(short, int, u32, void *, u16,
xpc_notify_func, void *),
void (*)(short, int, void *),
enum xp_retval (*)(short, void *));
extern void xpc_clear_interface(void);
extern enum xp_retval xpc_connect(int, xpc_channel_func, void *, u16,
u16, u32, u32);
extern void xpc_disconnect(int);
static inline enum xp_retval
xpc_send(short partid, int ch_number, u32 flags, void *payload,
u16 payload_size)
{
if (!xpc_interface.send)
return xpNotLoaded;
return xpc_interface.send(partid, ch_number, flags, payload,
payload_size);
}
static inline enum xp_retval
xpc_send_notify(short partid, int ch_number, u32 flags, void *payload,
u16 payload_size, xpc_notify_func func, void *key)
{
if (!xpc_interface.send_notify)
return xpNotLoaded;
return xpc_interface.send_notify(partid, ch_number, flags, payload,
payload_size, func, key);
}
static inline void
xpc_received(short partid, int ch_number, void *payload)
{
if (xpc_interface.received)
xpc_interface.received(partid, ch_number, payload);
}
static inline enum xp_retval
xpc_partid_to_nasids(short partid, void *nasids)
{
if (!xpc_interface.partid_to_nasids)
return xpNotLoaded;
return xpc_interface.partid_to_nasids(partid, nasids);
}
extern short xp_max_npartitions;
extern short xp_partition_id;
extern u8 xp_region_size;
extern unsigned long (*xp_pa) (void *);
extern unsigned long (*xp_socket_pa) (unsigned long);
extern enum xp_retval (*xp_remote_memcpy) (unsigned long, const unsigned long,
size_t);
extern int (*xp_cpu_to_nasid) (int);
extern enum xp_retval (*xp_expand_memprotect) (unsigned long, unsigned long);
extern enum xp_retval (*xp_restrict_memprotect) (unsigned long, unsigned long);
extern u64 xp_nofault_PIOR_target;
extern int xp_nofault_PIOR(void *);
extern int xp_error_PIOR(void);
extern struct device *xp;
extern enum xp_retval xp_init_sn2(void);
extern enum xp_retval xp_init_uv(void);
extern void xp_exit_sn2(void);
extern void xp_exit_uv(void);
#endif /* _DRIVERS_MISC_SGIXP_XP_H */
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