diff options
Diffstat (limited to 'drivers/misc/sgi-xp/xp_main.c')
| -rw-r--r-- | drivers/misc/sgi-xp/xp_main.c | 279 |
1 files changed, 279 insertions, 0 deletions
diff --git a/drivers/misc/sgi-xp/xp_main.c b/drivers/misc/sgi-xp/xp_main.c new file mode 100644 index 00000000000..1fbf99bae96 --- /dev/null +++ b/drivers/misc/sgi-xp/xp_main.c @@ -0,0 +1,279 @@ +/* + * 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. + */ + +/* + * Cross Partition (XP) base. + * + * XP provides a base from which its users can interact + * with XPC, yet not be dependent on XPC. + * + */ + +#include <linux/kernel.h> +#include <linux/interrupt.h> +#include <linux/module.h> +#include <linux/mutex.h> +#include <asm/sn/intr.h> +#include <asm/sn/sn_sal.h> +#include "xp.h" + +/* + * The export of xp_nofault_PIOR needs to happen here since it is defined + * in drivers/misc/sgi-xp/xp_nofault.S. The target of the nofault read is + * defined here. + */ +EXPORT_SYMBOL_GPL(xp_nofault_PIOR); + +u64 xp_nofault_PIOR_target; +EXPORT_SYMBOL_GPL(xp_nofault_PIOR_target); + +/* + * xpc_registrations[] keeps track of xpc_connect()'s done by the kernel-level + * users of XPC. + */ +struct xpc_registration xpc_registrations[XPC_NCHANNELS]; +EXPORT_SYMBOL_GPL(xpc_registrations); + +/* + * Initialize the XPC interface to indicate that XPC isn't loaded. + */ +static enum xpc_retval +xpc_notloaded(void) +{ + return xpcNotLoaded; +} + +struct xpc_interface xpc_interface = { + (void (*)(int))xpc_notloaded, + (void (*)(int))xpc_notloaded, + (enum xpc_retval(*)(partid_t, int, u32, void **))xpc_notloaded, + (enum xpc_retval(*)(partid_t, int, void *))xpc_notloaded, + (enum xpc_retval(*)(partid_t, int, void *, xpc_notify_func, void *)) + xpc_notloaded, + (void (*)(partid_t, int, void *))xpc_notloaded, + (enum xpc_retval(*)(partid_t, void *))xpc_notloaded +}; +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 xpc_retval (*allocate) (partid_t, int, u32, void **), + enum xpc_retval (*send) (partid_t, int, void *), + enum xpc_retval (*send_notify) (partid_t, int, void *, + xpc_notify_func, void *), + void (*received) (partid_t, int, void *), + enum xpc_retval (*partid_to_nasids) (partid_t, void *)) +{ + xpc_interface.connect = connect; + xpc_interface.disconnect = disconnect; + xpc_interface.allocate = allocate; + 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) +{ + xpc_interface.connect = (void (*)(int))xpc_notloaded; + xpc_interface.disconnect = (void (*)(int))xpc_notloaded; + xpc_interface.allocate = (enum xpc_retval(*)(partid_t, int, u32, + void **))xpc_notloaded; + xpc_interface.send = (enum xpc_retval(*)(partid_t, int, void *)) + xpc_notloaded; + xpc_interface.send_notify = (enum xpc_retval(*)(partid_t, int, void *, + xpc_notify_func, + void *))xpc_notloaded; + xpc_interface.received = (void (*)(partid_t, int, void *)) + xpc_notloaded; + xpc_interface.partid_to_nasids = (enum xpc_retval(*)(partid_t, void *)) + xpc_notloaded; +} +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 xpcConnected 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 xpc_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_NCHANNELS); + DBUG_ON(payload_size == 0 || nentries == 0); + DBUG_ON(func == NULL); + DBUG_ON(assigned_limit == 0 || idle_limit > assigned_limit); + + registration = &xpc_registrations[ch_number]; + + if (mutex_lock_interruptible(®istration->mutex) != 0) + return xpcInterrupted; + + /* if XPC_CHANNEL_REGISTERED(ch_number) */ + if (registration->func != NULL) { + mutex_unlock(®istration->mutex); + return xpcAlreadyRegistered; + } + + /* register the channel for connection */ + registration->msg_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(®istration->mutex); + + xpc_interface.connect(ch_number); + + return xpcSuccess; +} +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_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(®istration->mutex); + + /* if !XPC_CHANNEL_REGISTERED(ch_number) */ + if (registration->func == NULL) { + mutex_unlock(®istration->mutex); + return; + } + + /* remove the connection registration for the specified channel */ + registration->func = NULL; + registration->key = NULL; + registration->nentries = 0; + registration->msg_size = 0; + registration->assigned_limit = 0; + registration->idle_limit = 0; + + xpc_interface.disconnect(ch_number); + + mutex_unlock(®istration->mutex); + + return; +} +EXPORT_SYMBOL_GPL(xpc_disconnect); + +int __init +xp_init(void) +{ + int ret, ch_number; + u64 func_addr = *(u64 *)xp_nofault_PIOR; + u64 err_func_addr = *(u64 *)xp_error_PIOR; + + if (!ia64_platform_is("sn2")) + return -ENODEV; + + /* + * Register a nofault code region which performs a cross-partition + * PIO read. If the PIO read times out, the MCA handler will consume + * the error and return to a kernel-provided instruction to indicate + * an error. This PIO read exists because it is guaranteed to timeout + * if the destination is down (AMO operations do not timeout on at + * least some CPUs on Shubs <= v1.2, which unfortunately we have to + * work around). + */ + ret = sn_register_nofault_code(func_addr, err_func_addr, err_func_addr, + 1, 1); + if (ret != 0) { + printk(KERN_ERR "XP: can't register nofault code, error=%d\n", + ret); + } + /* + * Setup the nofault PIO read target. (There is no special reason why + * SH_IPI_ACCESS was selected.) + */ + if (is_shub2()) + xp_nofault_PIOR_target = SH2_IPI_ACCESS0; + else + xp_nofault_PIOR_target = SH1_IPI_ACCESS; + + /* initialize the connection registration mutex */ + for (ch_number = 0; ch_number < XPC_NCHANNELS; ch_number++) + mutex_init(&xpc_registrations[ch_number].mutex); + + return 0; +} + +module_init(xp_init); + +void __exit +xp_exit(void) +{ + u64 func_addr = *(u64 *)xp_nofault_PIOR; + u64 err_func_addr = *(u64 *)xp_error_PIOR; + + /* unregister the PIO read nofault code region */ + (void)sn_register_nofault_code(func_addr, err_func_addr, + err_func_addr, 1, 0); +} + +module_exit(xp_exit); + +MODULE_AUTHOR("Silicon Graphics, Inc."); +MODULE_DESCRIPTION("Cross Partition (XP) base"); +MODULE_LICENSE("GPL"); |