lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

sgi-xp: support runtime selection of xp_max_npartitions

Browse Source 
Support runtime selection of the max number of partitions based on the
hardware being run on.

Signed-off-by: Dean Nelson <dcn@sgi.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dean Nelson
2008-07-29 22:34:04 -07:00
committed by Linus Torvalds
parent 78ce1bbe44
commit bc63d387e4
10 changed files with 266 additions and 151 deletions
Download Patch File Download Diff File Expand all files Collapse all files

84
drivers/misc/sgi-xp/xp_main.c
View File

@@ -15,28 +15,32 @@
*/
#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 <linux/device.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);
/* define the XP debug device structures to be used with dev_dbg() et al */
u64 xp_nofault_PIOR_target;
EXPORT_SYMBOL_GPL(xp_nofault_PIOR_target);
struct device_driver xp_dbg_name = {
.name = "xp"
};
struct device xp_dbg_subname = {
.bus_id = {0}, /* 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);
/*
* xpc_registrations[] keeps track of xpc_connect()'s done by the kernel-level
* users of XPC.
*/
struct xpc_registration xpc_registrations[XPC_NCHANNELS];
struct xpc_registration xpc_registrations[XPC_MAX_NCHANNELS];
EXPORT_SYMBOL_GPL(xpc_registrations);
/*
@@ -135,7 +139,7 @@ xpc_connect(int ch_number, xpc_channel_func func, void *key, u16 payload_size,
{
struct xpc_registration *registration;
DBUG_ON(ch_number < 0 || ch_number >= XPC_NCHANNELS);
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);
@@ -185,7 +189,7 @@ xpc_disconnect(int ch_number)
{
struct xpc_registration *registration;
DBUG_ON(ch_number < 0 || ch_number >= XPC_NCHANNELS);
DBUG_ON(ch_number < 0 || ch_number >= XPC_MAX_NCHANNELS);
registration = &xpc_registrations[ch_number];
@@ -221,39 +225,21 @@ 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;
enum xp_retval ret;
int ch_number;
if (!ia64_platform_is("sn2"))
if (is_shub())
ret = xp_init_sn2();
else if (is_uv())
ret = xp_init_uv();
else
ret = xpUnsupported;
if (ret != xpSuccess)
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++)
for (ch_number = 0; ch_number < XPC_MAX_NCHANNELS; ch_number++)
mutex_init(&xpc_registrations[ch_number].mutex);
return 0;
@@ -264,12 +250,10 @@ 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);
if (is_shub())
xp_exit_sn2();
else if (is_uv())
xp_exit_uv();
}
module_exit(xp_exit);