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bc63d387 DN |
1 | /* |
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 | |
4 | * for more details. | |
5 | * | |
6 | * Copyright (c) 2008 Silicon Graphics, Inc. All Rights Reserved. | |
7 | */ | |
8 | ||
9 | /* | |
10 | * Cross Partition (XP) sn2-based functions. | |
11 | * | |
12 | * Architecture specific implementation of common functions. | |
13 | */ | |
14 | ||
261f3b49 | 15 | #include <linux/module.h> |
bc63d387 | 16 | #include <linux/device.h> |
908787db | 17 | #include <asm/sn/bte.h> |
bc63d387 DN |
18 | #include <asm/sn/sn_sal.h> |
19 | #include "xp.h" | |
20 | ||
21 | /* | |
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 | |
24 | * defined here. | |
25 | */ | |
26 | EXPORT_SYMBOL_GPL(xp_nofault_PIOR); | |
27 | ||
28 | u64 xp_nofault_PIOR_target; | |
29 | EXPORT_SYMBOL_GPL(xp_nofault_PIOR_target); | |
30 | ||
31 | /* | |
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 | |
c39838ce | 36 | * (amo operations do not timeout on at least some CPUs on Shubs <= v1.2, |
bc63d387 DN |
37 | * which unfortunately we have to work around). |
38 | */ | |
39 | static enum xp_retval | |
40 | xp_register_nofault_code_sn2(void) | |
41 | { | |
42 | int ret; | |
43 | u64 func_addr; | |
44 | u64 err_func_addr; | |
45 | ||
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, | |
49 | 1, 1); | |
50 | if (ret != 0) { | |
51 | dev_err(xp, "can't register nofault code, error=%d\n", ret); | |
52 | return xpSalError; | |
53 | } | |
54 | /* | |
55 | * Setup the nofault PIO read target. (There is no special reason why | |
56 | * SH_IPI_ACCESS was selected.) | |
57 | */ | |
58 | if (is_shub1()) | |
59 | xp_nofault_PIOR_target = SH1_IPI_ACCESS; | |
60 | else if (is_shub2()) | |
61 | xp_nofault_PIOR_target = SH2_IPI_ACCESS0; | |
62 | ||
63 | return xpSuccess; | |
64 | } | |
65 | ||
a812dcc3 | 66 | static void |
bc63d387 DN |
67 | xp_unregister_nofault_code_sn2(void) |
68 | { | |
69 | u64 func_addr = *(u64 *)xp_nofault_PIOR; | |
70 | u64 err_func_addr = *(u64 *)xp_error_PIOR; | |
71 | ||
72 | /* unregister the PIO read nofault code region */ | |
73 | (void)sn_register_nofault_code(func_addr, err_func_addr, | |
74 | err_func_addr, 1, 0); | |
75 | } | |
76 | ||
a812dcc3 DN |
77 | /* |
78 | * Convert a virtual memory address to a physical memory address. | |
79 | */ | |
80 | static unsigned long | |
81 | xp_pa_sn2(void *addr) | |
82 | { | |
83 | return __pa(addr); | |
84 | } | |
85 | ||
908787db DN |
86 | /* |
87 | * Wrapper for bte_copy(). | |
88 | * | |
a812dcc3 DN |
89 | * dst_pa - physical address of the destination of the transfer. |
90 | * src_pa - physical address of the source of the transfer. | |
908787db DN |
91 | * len - number of bytes to transfer from source to destination. |
92 | * | |
93 | * Note: xp_remote_memcpy_sn2() should never be called while holding a spinlock. | |
94 | */ | |
95 | static enum xp_retval | |
a812dcc3 DN |
96 | xp_remote_memcpy_sn2(unsigned long dst_pa, const unsigned long src_pa, |
97 | size_t len) | |
908787db DN |
98 | { |
99 | bte_result_t ret; | |
908787db | 100 | |
a812dcc3 | 101 | ret = bte_copy(src_pa, dst_pa, len, (BTE_NOTIFY | BTE_WACQUIRE), NULL); |
908787db DN |
102 | if (ret == BTE_SUCCESS) |
103 | return xpSuccess; | |
104 | ||
a812dcc3 DN |
105 | if (is_shub2()) { |
106 | dev_err(xp, "bte_copy() on shub2 failed, error=0x%x dst_pa=" | |
107 | "0x%016lx src_pa=0x%016lx len=%ld\\n", ret, dst_pa, | |
108 | src_pa, len); | |
109 | } else { | |
110 | dev_err(xp, "bte_copy() failed, error=%d dst_pa=0x%016lx " | |
111 | "src_pa=0x%016lx len=%ld\\n", ret, dst_pa, src_pa, len); | |
112 | } | |
908787db DN |
113 | |
114 | return xpBteCopyError; | |
115 | } | |
116 | ||
261f3b49 DN |
117 | static int |
118 | xp_cpu_to_nasid_sn2(int cpuid) | |
119 | { | |
120 | return cpuid_to_nasid(cpuid); | |
121 | } | |
122 | ||
6c1c325d DN |
123 | static enum xp_retval |
124 | xp_expand_memprotect_sn2(unsigned long phys_addr, unsigned long size) | |
125 | { | |
126 | u64 nasid_array = 0; | |
127 | int ret; | |
128 | ||
129 | ret = sn_change_memprotect(phys_addr, size, SN_MEMPROT_ACCESS_CLASS_1, | |
130 | &nasid_array); | |
131 | if (ret != 0) { | |
132 | dev_err(xp, "sn_change_memprotect(,, " | |
133 | "SN_MEMPROT_ACCESS_CLASS_1,) failed ret=%d\n", ret); | |
134 | return xpSalError; | |
135 | } | |
136 | return xpSuccess; | |
137 | } | |
138 | ||
139 | static enum xp_retval | |
140 | xp_restrict_memprotect_sn2(unsigned long phys_addr, unsigned long size) | |
141 | { | |
142 | u64 nasid_array = 0; | |
143 | int ret; | |
144 | ||
145 | ret = sn_change_memprotect(phys_addr, size, SN_MEMPROT_ACCESS_CLASS_0, | |
146 | &nasid_array); | |
147 | if (ret != 0) { | |
148 | dev_err(xp, "sn_change_memprotect(,, " | |
149 | "SN_MEMPROT_ACCESS_CLASS_0,) failed ret=%d\n", ret); | |
150 | return xpSalError; | |
151 | } | |
152 | return xpSuccess; | |
153 | } | |
154 | ||
bc63d387 DN |
155 | enum xp_retval |
156 | xp_init_sn2(void) | |
157 | { | |
158 | BUG_ON(!is_shub()); | |
159 | ||
160 | xp_max_npartitions = XP_MAX_NPARTITIONS_SN2; | |
261f3b49 DN |
161 | xp_partition_id = sn_partition_id; |
162 | xp_region_size = sn_region_size; | |
bc63d387 | 163 | |
a812dcc3 | 164 | xp_pa = xp_pa_sn2; |
908787db | 165 | xp_remote_memcpy = xp_remote_memcpy_sn2; |
261f3b49 | 166 | xp_cpu_to_nasid = xp_cpu_to_nasid_sn2; |
6c1c325d DN |
167 | xp_expand_memprotect = xp_expand_memprotect_sn2; |
168 | xp_restrict_memprotect = xp_restrict_memprotect_sn2; | |
908787db | 169 | |
bc63d387 DN |
170 | return xp_register_nofault_code_sn2(); |
171 | } | |
172 | ||
173 | void | |
174 | xp_exit_sn2(void) | |
175 | { | |
176 | BUG_ON(!is_shub()); | |
177 | ||
178 | xp_unregister_nofault_code_sn2(); | |
179 | } | |
180 |