OpenCloudOS-Kernel/drivers/misc/sgi-xp/xp_main.c

262 lines
7.0 KiB
C

/*
* 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.
*
* (C) Copyright 2020 Hewlett Packard Enterprise Development LP
* Copyright (c) 2004-2008 Silicon Graphics, Inc. All Rights Reserved.
*/
/*
* Cross Partition (XP) base.
*
* XP provides a base from which its users can interact
* with XPC, yet not be dependent on XPC.
*
*/
#include <linux/module.h>
#include <linux/device.h>
#include "xp.h"
/* define the XP debug device structures to be used with dev_dbg() et al */
struct device_driver xp_dbg_name = {
.name = "xp"
};
struct device xp_dbg_subname = {
.init_name = "", /* set to "" */
.driver = &xp_dbg_name
};
struct device *xp = &xp_dbg_subname;
/* max #of partitions possible */
short xp_max_npartitions;
EXPORT_SYMBOL_GPL(xp_max_npartitions);
short xp_partition_id;
EXPORT_SYMBOL_GPL(xp_partition_id);
u8 xp_region_size;
EXPORT_SYMBOL_GPL(xp_region_size);
unsigned long (*xp_pa) (void *addr);
EXPORT_SYMBOL_GPL(xp_pa);
unsigned long (*xp_socket_pa) (unsigned long gpa);
EXPORT_SYMBOL_GPL(xp_socket_pa);
enum xp_retval (*xp_remote_memcpy) (unsigned long dst_gpa,
const unsigned long src_gpa, size_t len);
EXPORT_SYMBOL_GPL(xp_remote_memcpy);
int (*xp_cpu_to_nasid) (int cpuid);
EXPORT_SYMBOL_GPL(xp_cpu_to_nasid);
enum xp_retval (*xp_expand_memprotect) (unsigned long phys_addr,
unsigned long size);
EXPORT_SYMBOL_GPL(xp_expand_memprotect);
enum xp_retval (*xp_restrict_memprotect) (unsigned long phys_addr,
unsigned long size);
EXPORT_SYMBOL_GPL(xp_restrict_memprotect);
/*
* xpc_registrations[] keeps track of xpc_connect()'s done by the kernel-level
* users of XPC.
*/
struct xpc_registration xpc_registrations[XPC_MAX_NCHANNELS];
EXPORT_SYMBOL_GPL(xpc_registrations);
/*
* Initialize the XPC interface to NULL to indicate that XPC isn't loaded.
*/
struct xpc_interface xpc_interface = { };
EXPORT_SYMBOL_GPL(xpc_interface);
/*
* XPC calls this when it (the XPC module) has been loaded.
*/
void
xpc_set_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 *))
{
xpc_interface.connect = connect;
xpc_interface.disconnect = disconnect;
xpc_interface.send = send;
xpc_interface.send_notify = send_notify;
xpc_interface.received = received;
xpc_interface.partid_to_nasids = partid_to_nasids;
}
EXPORT_SYMBOL_GPL(xpc_set_interface);
/*
* XPC calls this when it (the XPC module) is being unloaded.
*/
void
xpc_clear_interface(void)
{
memset(&xpc_interface, 0, sizeof(xpc_interface));
}
EXPORT_SYMBOL_GPL(xpc_clear_interface);
/*
* Register for automatic establishment of a channel connection whenever
* a partition comes up.
*
* Arguments:
*
* ch_number - channel # to register for connection.
* func - function to call for asynchronous notification of channel
* state changes (i.e., connection, disconnection, error) and
* the arrival of incoming messages.
* key - pointer to optional user-defined value that gets passed back
* to the user on any callouts made to func.
* payload_size - size in bytes of the XPC message's payload area which
* contains a user-defined message. The user should make
* this large enough to hold their largest message.
* nentries - max #of XPC message entries a message queue can contain.
* The actual number, which is determined when a connection
* is established and may be less then requested, will be
* passed to the user via the xpConnected callout.
* assigned_limit - max number of kthreads allowed to be processing
* messages (per connection) at any given instant.
* idle_limit - max number of kthreads allowed to be idle at any given
* instant.
*/
enum xp_retval
xpc_connect(int ch_number, xpc_channel_func func, void *key, u16 payload_size,
u16 nentries, u32 assigned_limit, u32 idle_limit)
{
struct xpc_registration *registration;
DBUG_ON(ch_number < 0 || ch_number >= XPC_MAX_NCHANNELS);
DBUG_ON(payload_size == 0 || nentries == 0);
DBUG_ON(func == NULL);
DBUG_ON(assigned_limit == 0 || idle_limit > assigned_limit);
if (XPC_MSG_SIZE(payload_size) > XPC_MSG_MAX_SIZE)
return xpPayloadTooBig;
registration = &xpc_registrations[ch_number];
if (mutex_lock_interruptible(&registration->mutex) != 0)
return xpInterrupted;
/* if XPC_CHANNEL_REGISTERED(ch_number) */
if (registration->func != NULL) {
mutex_unlock(&registration->mutex);
return xpAlreadyRegistered;
}
/* register the channel for connection */
registration->entry_size = XPC_MSG_SIZE(payload_size);
registration->nentries = nentries;
registration->assigned_limit = assigned_limit;
registration->idle_limit = idle_limit;
registration->key = key;
registration->func = func;
mutex_unlock(&registration->mutex);
if (xpc_interface.connect)
xpc_interface.connect(ch_number);
return xpSuccess;
}
EXPORT_SYMBOL_GPL(xpc_connect);
/*
* Remove the registration for automatic connection of the specified channel
* when a partition comes up.
*
* Before returning this xpc_disconnect() will wait for all connections on the
* specified channel have been closed/torndown. So the caller can be assured
* that they will not be receiving any more callouts from XPC to their
* function registered via xpc_connect().
*
* Arguments:
*
* ch_number - channel # to unregister.
*/
void
xpc_disconnect(int ch_number)
{
struct xpc_registration *registration;
DBUG_ON(ch_number < 0 || ch_number >= XPC_MAX_NCHANNELS);
registration = &xpc_registrations[ch_number];
/*
* We've decided not to make this a down_interruptible(), since we
* figured XPC's users will just turn around and call xpc_disconnect()
* again anyways, so we might as well wait, if need be.
*/
mutex_lock(&registration->mutex);
/* if !XPC_CHANNEL_REGISTERED(ch_number) */
if (registration->func == NULL) {
mutex_unlock(&registration->mutex);
return;
}
/* remove the connection registration for the specified channel */
registration->func = NULL;
registration->key = NULL;
registration->nentries = 0;
registration->entry_size = 0;
registration->assigned_limit = 0;
registration->idle_limit = 0;
if (xpc_interface.disconnect)
xpc_interface.disconnect(ch_number);
mutex_unlock(&registration->mutex);
return;
}
EXPORT_SYMBOL_GPL(xpc_disconnect);
static int __init
xp_init(void)
{
enum xp_retval ret;
int ch_number;
/* initialize the connection registration mutex */
for (ch_number = 0; ch_number < XPC_MAX_NCHANNELS; ch_number++)
mutex_init(&xpc_registrations[ch_number].mutex);
if (is_uv_system())
ret = xp_init_uv();
else
ret = 0;
if (ret != xpSuccess)
return ret;
return 0;
}
module_init(xp_init);
static void __exit
xp_exit(void)
{
if (is_uv_system())
xp_exit_uv();
}
module_exit(xp_exit);
MODULE_AUTHOR("Silicon Graphics, Inc.");
MODULE_DESCRIPTION("Cross Partition (XP) base");
MODULE_LICENSE("GPL");