2 * This file is subject to the terms and conditions of the GNU General Public
3 * License. See the file "COPYING" in the main directory of this archive
6 * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved.
10 * Cross Partition (XP) sn2-based functions.
12 * Architecture specific implementation of common functions.
15 #include <linux/module.h>
16 #include <linux/device.h>
17 #include <asm/sn/bte.h>
18 #include <asm/sn/sn_sal.h>
22 * The export of xp_nofault_PIOR needs to happen here since it is defined
23 * in drivers/misc/sgi-xp/xp_nofault.S. The target of the nofault read is
26 EXPORT_SYMBOL_GPL(xp_nofault_PIOR);
28 u64 xp_nofault_PIOR_target;
29 EXPORT_SYMBOL_GPL(xp_nofault_PIOR_target);
32 * Register a nofault code region which performs a cross-partition PIO read.
33 * If the PIO read times out, the MCA handler will consume the error and
34 * return to a kernel-provided instruction to indicate an error. This PIO read
35 * exists because it is guaranteed to timeout if the destination is down
36 * (amo operations do not timeout on at least some CPUs on Shubs <= v1.2,
37 * which unfortunately we have to work around).
40 xp_register_nofault_code_sn2(void)
46 func_addr = *(u64 *)xp_nofault_PIOR;
47 err_func_addr = *(u64 *)xp_error_PIOR;
48 ret = sn_register_nofault_code(func_addr, err_func_addr, err_func_addr,
51 dev_err(xp, "can't register nofault code, error=%d\n", ret);
55 * Setup the nofault PIO read target. (There is no special reason why
56 * SH_IPI_ACCESS was selected.)
59 xp_nofault_PIOR_target = SH1_IPI_ACCESS;
61 xp_nofault_PIOR_target = SH2_IPI_ACCESS0;
67 xp_unregister_nofault_code_sn2(void)
69 u64 func_addr = *(u64 *)xp_nofault_PIOR;
70 u64 err_func_addr = *(u64 *)xp_error_PIOR;
72 /* unregister the PIO read nofault code region */
73 (void)sn_register_nofault_code(func_addr, err_func_addr,
78 * Wrapper for bte_copy().
80 * vdst - virtual address of the destination of the transfer.
81 * psrc - physical address of the source of the transfer.
82 * len - number of bytes to transfer from source to destination.
84 * Note: xp_remote_memcpy_sn2() should never be called while holding a spinlock.
87 xp_remote_memcpy_sn2(void *vdst, const void *psrc, size_t len)
90 u64 pdst = ia64_tpa(vdst);
91 /* ??? What are the rules governing the src and dst addresses passed in?
92 * ??? Currently we're assuming that dst is a virtual address and src
93 * ??? is a physical address, is this appropriate? Can we allow them to
94 * ??? be whatever and we make the change here without damaging the
99 * Ensure that the physically mapped memory is contiguous.
101 * We do this by ensuring that the memory is from region 7 only.
102 * If the need should arise to use memory from one of the other
103 * regions, then modify the BUG_ON() statement to ensure that the
104 * memory from that region is always physically contiguous.
106 BUG_ON(REGION_NUMBER(vdst) != RGN_KERNEL);
108 ret = bte_copy((u64)psrc, pdst, len, (BTE_NOTIFY | BTE_WACQUIRE), NULL);
109 if (ret == BTE_SUCCESS)
113 dev_err(xp, "bte_copy() on shub2 failed, error=0x%x\n", ret);
115 dev_err(xp, "bte_copy() failed, error=%d\n", ret);
117 return xpBteCopyError;
121 xp_cpu_to_nasid_sn2(int cpuid)
123 return cpuid_to_nasid(cpuid);
131 xp_max_npartitions = XP_MAX_NPARTITIONS_SN2;
132 xp_partition_id = sn_partition_id;
133 xp_region_size = sn_region_size;
135 xp_remote_memcpy = xp_remote_memcpy_sn2;
136 xp_cpu_to_nasid = xp_cpu_to_nasid_sn2;
138 return xp_register_nofault_code_sn2();
146 xp_unregister_nofault_code_sn2();