diff options
Diffstat (limited to 'drivers/misc/sgi-xp/xp_sn2.c')
| -rw-r--r-- | drivers/misc/sgi-xp/xp_sn2.c | 92 |
1 files changed, 92 insertions, 0 deletions
diff --git a/drivers/misc/sgi-xp/xp_sn2.c b/drivers/misc/sgi-xp/xp_sn2.c new file mode 100644 index 000000000000..b92579356a64 --- /dev/null +++ b/drivers/misc/sgi-xp/xp_sn2.c @@ -0,0 +1,92 @@ +/* + * 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) 2008 Silicon Graphics, Inc. All Rights Reserved. + */ + +/* + * Cross Partition (XP) sn2-based functions. + * + * Architecture specific implementation of common functions. + */ + +#include <linux/device.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); + +/* + * 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). + */ +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; +} + +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); +} + +enum xp_retval +xp_init_sn2(void) +{ + BUG_ON(!is_shub()); + + xp_max_npartitions = XP_MAX_NPARTITIONS_SN2; + + return xp_register_nofault_code_sn2(); +} + +void +xp_exit_sn2(void) +{ + BUG_ON(!is_shub()); + + xp_unregister_nofault_code_sn2(); +} + |