static enum xp_retval
xp_register_nofault_code_sn2(void)
{
int ret;
u64 func_addr;
u64 err_func_addr;
func_addr = *(u64 *)xp_nofault_PIOR;
err_func_addr = *(u64 *)xp_error_PIOR;
ret = sn_register_nofault_code(func_addr, err_func_addr, err_func_addr,
1, 1);
if (ret != 0) {
dev_err(xp, "can't register nofault code, error=%d\n", ret);
return xpSalError;
}
/*
* Setup the nofault PIO read target. (There is no special reason why
* SH_IPI_ACCESS was selected.)
*/
if (is_shub1())
xp_nofault_PIOR_target = SH1_IPI_ACCESS;
else if (is_shub2())
xp_nofault_PIOR_target = SH2_IPI_ACCESS0;
return xpSuccess;
}
static enum xp_retval
xp_register_nofault_code_sn2(void)
{
int ret;
u64 func_addr;
u64 err_func_addr;
func_addr = *(u64 *)xp_nofault_PIOR;
err_func_addr = *(u64 *)xp_error_PIOR;
ret = sn_register_nofault_code(func_addr, err_func_addr, err_func_addr,
1, 1);
if (ret != 0) {
dev_err(xp, "can't register nofault code, error=%d\n", ret);
return xpSalError;
}
/*
*/
if (is_shub1())
xp_nofault_PIOR_target = SH1_IPI_ACCESS;
else if (is_shub2())
xp_nofault_PIOR_target = SH2_IPI_ACCESS0;
return xpSuccess;
}
static void
xp_unregister_nofault_code_sn2(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);
}
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).
*/
if ((ret = sn_register_nofault_code(func_addr, err_func_addr,
err_func_addr, 1, 1)) != 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;
}
