mirror of https://gitee.com/openkylin/linux.git
93 lines
2.3 KiB
C
93 lines
2.3 KiB
C
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/*
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* This file is subject to the terms and conditions of the GNU General Public
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* License. See the file "COPYING" in the main directory of this archive
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* for more details.
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*
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* Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
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*/
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/*
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* Cross Partition (XP) sn2-based functions.
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*
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* Architecture specific implementation of common functions.
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*/
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#include <linux/device.h>
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#include <asm/sn/sn_sal.h>
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#include "xp.h"
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/*
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* The export of xp_nofault_PIOR needs to happen here since it is defined
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* in drivers/misc/sgi-xp/xp_nofault.S. The target of the nofault read is
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* defined here.
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*/
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EXPORT_SYMBOL_GPL(xp_nofault_PIOR);
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u64 xp_nofault_PIOR_target;
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EXPORT_SYMBOL_GPL(xp_nofault_PIOR_target);
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/*
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* Register a nofault code region which performs a cross-partition PIO read.
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* If the PIO read times out, the MCA handler will consume the error and
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* return to a kernel-provided instruction to indicate an error. This PIO read
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* exists because it is guaranteed to timeout if the destination is down
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* (AMO operations do not timeout on at least some CPUs on Shubs <= v1.2,
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* which unfortunately we have to work around).
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*/
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static enum xp_retval
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xp_register_nofault_code_sn2(void)
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{
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int ret;
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u64 func_addr;
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u64 err_func_addr;
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func_addr = *(u64 *)xp_nofault_PIOR;
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err_func_addr = *(u64 *)xp_error_PIOR;
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ret = sn_register_nofault_code(func_addr, err_func_addr, err_func_addr,
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1, 1);
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if (ret != 0) {
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dev_err(xp, "can't register nofault code, error=%d\n", ret);
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return xpSalError;
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}
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/*
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* Setup the nofault PIO read target. (There is no special reason why
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* SH_IPI_ACCESS was selected.)
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*/
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if (is_shub1())
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xp_nofault_PIOR_target = SH1_IPI_ACCESS;
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else if (is_shub2())
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xp_nofault_PIOR_target = SH2_IPI_ACCESS0;
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return xpSuccess;
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}
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void
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xp_unregister_nofault_code_sn2(void)
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{
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u64 func_addr = *(u64 *)xp_nofault_PIOR;
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u64 err_func_addr = *(u64 *)xp_error_PIOR;
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/* unregister the PIO read nofault code region */
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(void)sn_register_nofault_code(func_addr, err_func_addr,
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err_func_addr, 1, 0);
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}
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enum xp_retval
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xp_init_sn2(void)
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{
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BUG_ON(!is_shub());
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xp_max_npartitions = XP_MAX_NPARTITIONS_SN2;
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return xp_register_nofault_code_sn2();
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}
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void
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xp_exit_sn2(void)
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{
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BUG_ON(!is_shub());
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xp_unregister_nofault_code_sn2();
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}
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