Commit | Line | Data |
---|---|---|
1da177e4 | 1 | /* |
69a80d3f | 2 | * SMP support for pSeries machines. |
1da177e4 LT |
3 | * |
4 | * Dave Engebretsen, Peter Bergner, and | |
5 | * Mike Corrigan {engebret|bergner|mikec}@us.ibm.com | |
6 | * | |
7 | * Plus various changes from other IBM teams... | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or | |
10 | * modify it under the terms of the GNU General Public License | |
11 | * as published by the Free Software Foundation; either version | |
12 | * 2 of the License, or (at your option) any later version. | |
13 | */ | |
14 | ||
1da177e4 | 15 | |
1da177e4 LT |
16 | #include <linux/kernel.h> |
17 | #include <linux/module.h> | |
18 | #include <linux/sched.h> | |
19 | #include <linux/smp.h> | |
20 | #include <linux/interrupt.h> | |
21 | #include <linux/delay.h> | |
22 | #include <linux/init.h> | |
23 | #include <linux/spinlock.h> | |
24 | #include <linux/cache.h> | |
25 | #include <linux/err.h> | |
26 | #include <linux/sysdev.h> | |
27 | #include <linux/cpu.h> | |
28 | ||
29 | #include <asm/ptrace.h> | |
30 | #include <asm/atomic.h> | |
31 | #include <asm/irq.h> | |
32 | #include <asm/page.h> | |
33 | #include <asm/pgtable.h> | |
34 | #include <asm/io.h> | |
35 | #include <asm/prom.h> | |
36 | #include <asm/smp.h> | |
37 | #include <asm/paca.h> | |
1da177e4 | 38 | #include <asm/machdep.h> |
1da177e4 | 39 | #include <asm/cputable.h> |
1ababe11 | 40 | #include <asm/firmware.h> |
1da177e4 LT |
41 | #include <asm/system.h> |
42 | #include <asm/rtas.h> | |
1da177e4 | 43 | #include <asm/pSeries_reconfig.h> |
bbeb3f4c | 44 | #include <asm/mpic.h> |
271c3f35 | 45 | #include <asm/vdso_datapage.h> |
8d089085 | 46 | #include <asm/cputhreads.h> |
1da177e4 | 47 | |
a1218720 | 48 | #include "plpar_wrappers.h" |
8feaeca2 | 49 | #include "pseries.h" |
d13f7208 | 50 | #include "xics.h" |
3aa565f5 | 51 | #include "offline_states.h" |
a1218720 | 52 | |
1da177e4 LT |
53 | |
54 | /* | |
6a75a6b8 MM |
55 | * The Primary thread of each non-boot processor was started from the OF client |
56 | * interface by prom_hold_cpus and is spinning on secondary_hold_spinloop. | |
1da177e4 LT |
57 | */ |
58 | static cpumask_t of_spin_map; | |
59 | ||
f8b67691 MN |
60 | /* Query where a cpu is now. Return codes #defined in plpar_wrappers.h */ |
61 | int smp_query_cpu_stopped(unsigned int pcpu) | |
62 | { | |
63 | int cpu_status, status; | |
64 | int qcss_tok = rtas_token("query-cpu-stopped-state"); | |
65 | ||
66 | if (qcss_tok == RTAS_UNKNOWN_SERVICE) { | |
67 | printk(KERN_INFO "Firmware doesn't support " | |
68 | "query-cpu-stopped-state\n"); | |
69 | return QCSS_HARDWARE_ERROR; | |
70 | } | |
71 | ||
72 | status = rtas_call(qcss_tok, 1, 2, &cpu_status, pcpu); | |
73 | if (status != 0) { | |
74 | printk(KERN_ERR | |
75 | "RTAS query-cpu-stopped-state failed: %i\n", status); | |
76 | return status; | |
77 | } | |
78 | ||
79 | return cpu_status; | |
80 | } | |
81 | ||
1da177e4 LT |
82 | /** |
83 | * smp_startup_cpu() - start the given cpu | |
84 | * | |
85 | * At boot time, there is nothing to do for primary threads which were | |
86 | * started from Open Firmware. For anything else, call RTAS with the | |
87 | * appropriate start location. | |
88 | * | |
89 | * Returns: | |
90 | * 0 - failure | |
91 | * 1 - success | |
92 | */ | |
93 | static inline int __devinit smp_startup_cpu(unsigned int lcpu) | |
94 | { | |
95 | int status; | |
96 | unsigned long start_here = __pa((u32)*((unsigned long *) | |
f39b7a55 | 97 | generic_secondary_smp_init)); |
1da177e4 | 98 | unsigned int pcpu; |
1ed2fd2d | 99 | int start_cpu; |
1da177e4 LT |
100 | |
101 | if (cpu_isset(lcpu, of_spin_map)) | |
102 | /* Already started by OF and sitting in spin loop */ | |
103 | return 1; | |
104 | ||
105 | pcpu = get_hard_smp_processor_id(lcpu); | |
106 | ||
107 | /* Fixup atomic count: it exited inside IRQ handler. */ | |
b5e2fc1c | 108 | task_thread_info(paca[lcpu].__current)->preempt_count = 0; |
1da177e4 | 109 | |
3aa565f5 GS |
110 | if (get_cpu_current_state(lcpu) == CPU_STATE_INACTIVE) |
111 | goto out; | |
112 | ||
1ed2fd2d AB |
113 | /* |
114 | * If the RTAS start-cpu token does not exist then presume the | |
115 | * cpu is already spinning. | |
116 | */ | |
117 | start_cpu = rtas_token("start-cpu"); | |
118 | if (start_cpu == RTAS_UNKNOWN_SERVICE) | |
119 | return 1; | |
120 | ||
496b7a51 | 121 | status = rtas_call(start_cpu, 3, 1, NULL, pcpu, start_here, pcpu); |
1da177e4 LT |
122 | if (status != 0) { |
123 | printk(KERN_ERR "start-cpu failed: %i\n", status); | |
124 | return 0; | |
125 | } | |
1ed2fd2d | 126 | |
3aa565f5 | 127 | out: |
1da177e4 LT |
128 | return 1; |
129 | } | |
130 | ||
cebf589c | 131 | #ifdef CONFIG_XICS |
1da177e4 LT |
132 | static void __devinit smp_xics_setup_cpu(int cpu) |
133 | { | |
134 | if (cpu != boot_cpuid) | |
135 | xics_setup_cpu(); | |
136 | ||
1ababe11 | 137 | if (firmware_has_feature(FW_FEATURE_SPLPAR)) |
1da177e4 LT |
138 | vpa_init(cpu); |
139 | ||
140 | cpu_clear(cpu, of_spin_map); | |
3aa565f5 GS |
141 | set_cpu_current_state(cpu, CPU_STATE_ONLINE); |
142 | set_default_offline_state(cpu); | |
1da177e4 | 143 | |
1da177e4 | 144 | } |
cebf589c | 145 | #endif /* CONFIG_XICS */ |
1da177e4 | 146 | |
1da177e4 LT |
147 | static void __devinit smp_pSeries_kick_cpu(int nr) |
148 | { | |
3aa565f5 GS |
149 | long rc; |
150 | unsigned long hcpuid; | |
1da177e4 LT |
151 | BUG_ON(nr < 0 || nr >= NR_CPUS); |
152 | ||
153 | if (!smp_startup_cpu(nr)) | |
154 | return; | |
155 | ||
156 | /* | |
157 | * The processor is currently spinning, waiting for the | |
158 | * cpu_start field to become non-zero After we set cpu_start, | |
159 | * the processor will continue on to secondary_start | |
160 | */ | |
161 | paca[nr].cpu_start = 1; | |
3aa565f5 GS |
162 | |
163 | set_preferred_offline_state(nr, CPU_STATE_ONLINE); | |
164 | ||
165 | if (get_cpu_current_state(nr) == CPU_STATE_INACTIVE) { | |
166 | hcpuid = get_hard_smp_processor_id(nr); | |
167 | rc = plpar_hcall_norets(H_PROD, hcpuid); | |
168 | if (rc != H_SUCCESS) | |
5a2ad98e JP |
169 | printk(KERN_ERR "Error: Prod to wake up processor %d " |
170 | "Ret= %ld\n", nr, rc); | |
3aa565f5 | 171 | } |
1da177e4 LT |
172 | } |
173 | ||
174 | static int smp_pSeries_cpu_bootable(unsigned int nr) | |
175 | { | |
176 | /* Special case - we inhibit secondary thread startup | |
6a75a6b8 | 177 | * during boot if the user requests it. |
1da177e4 LT |
178 | */ |
179 | if (system_state < SYSTEM_RUNNING && | |
0231c290 | 180 | cpu_has_feature(CPU_FTR_SMT) && |
8d089085 | 181 | !smt_enabled_at_boot && cpu_thread_in_core(nr) != 0) |
1da177e4 LT |
182 | return 0; |
183 | ||
184 | return 1; | |
185 | } | |
cebf589c | 186 | #ifdef CONFIG_MPIC |
1da177e4 LT |
187 | static struct smp_ops_t pSeries_mpic_smp_ops = { |
188 | .message_pass = smp_mpic_message_pass, | |
189 | .probe = smp_mpic_probe, | |
190 | .kick_cpu = smp_pSeries_kick_cpu, | |
191 | .setup_cpu = smp_mpic_setup_cpu, | |
192 | }; | |
cebf589c AB |
193 | #endif |
194 | #ifdef CONFIG_XICS | |
1da177e4 LT |
195 | static struct smp_ops_t pSeries_xics_smp_ops = { |
196 | .message_pass = smp_xics_message_pass, | |
197 | .probe = smp_xics_probe, | |
198 | .kick_cpu = smp_pSeries_kick_cpu, | |
199 | .setup_cpu = smp_xics_setup_cpu, | |
200 | .cpu_bootable = smp_pSeries_cpu_bootable, | |
201 | }; | |
cebf589c | 202 | #endif |
1da177e4 LT |
203 | |
204 | /* This is called very early */ | |
0ebfff14 | 205 | static void __init smp_init_pseries(void) |
1da177e4 LT |
206 | { |
207 | int i; | |
208 | ||
f7ebf352 | 209 | pr_debug(" -> smp_init_pSeries()\n"); |
1da177e4 | 210 | |
1da177e4 | 211 | /* Mark threads which are still spinning in hold loops. */ |
0231c290 AB |
212 | if (cpu_has_feature(CPU_FTR_SMT)) { |
213 | for_each_present_cpu(i) { | |
6a75a6b8 | 214 | if (cpu_thread_in_core(i) == 0) |
1da177e4 LT |
215 | cpu_set(i, of_spin_map); |
216 | } | |
0231c290 | 217 | } else { |
1da177e4 | 218 | of_spin_map = cpu_present_map; |
0231c290 | 219 | } |
1da177e4 LT |
220 | |
221 | cpu_clear(boot_cpuid, of_spin_map); | |
222 | ||
223 | /* Non-lpar has additional take/give timebase */ | |
224 | if (rtas_token("freeze-time-base") != RTAS_UNKNOWN_SERVICE) { | |
c4007a2f BH |
225 | smp_ops->give_timebase = rtas_give_timebase; |
226 | smp_ops->take_timebase = rtas_take_timebase; | |
1da177e4 LT |
227 | } |
228 | ||
f7ebf352 | 229 | pr_debug(" <- smp_init_pSeries()\n"); |
1da177e4 LT |
230 | } |
231 | ||
0ebfff14 BH |
232 | #ifdef CONFIG_MPIC |
233 | void __init smp_init_pseries_mpic(void) | |
234 | { | |
235 | smp_ops = &pSeries_mpic_smp_ops; | |
236 | ||
237 | smp_init_pseries(); | |
238 | } | |
239 | #endif | |
240 | ||
241 | void __init smp_init_pseries_xics(void) | |
242 | { | |
243 | smp_ops = &pSeries_xics_smp_ops; | |
244 | ||
245 | smp_init_pseries(); | |
246 | } |