Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * arch/s390/kernel/smp.c |
| 3 | * |
Hans-Joachim Picht | 155af2f | 2009-06-16 10:30:52 +0200 | [diff] [blame] | 4 | * Copyright IBM Corp. 1999, 2009 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 6 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
| 7 | * Heiko Carstens (heiko.carstens@de.ibm.com) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 9 | * based on other smp stuff by |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | * (c) 1995 Alan Cox, CymruNET Ltd <alan@cymru.net> |
| 11 | * (c) 1998 Ingo Molnar |
| 12 | * |
| 13 | * We work with logical cpu numbering everywhere we can. The only |
| 14 | * functions using the real cpu address (got from STAP) are the sigp |
| 15 | * functions. For all other functions we use the identity mapping. |
| 16 | * That means that cpu_number_map[i] == i for every cpu. cpu_number_map is |
| 17 | * used e.g. to find the idle task belonging to a logical cpu. Every array |
| 18 | * in the kernel is sorted by the logical cpu number and not by the physical |
| 19 | * one which is causing all the confusion with __cpu_logical_map and |
| 20 | * cpu_number_map in other architectures. |
| 21 | */ |
| 22 | |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 23 | #define KMSG_COMPONENT "cpu" |
| 24 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 25 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/module.h> |
| 27 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/mm.h> |
Alexey Dobriyan | 4e950f6 | 2007-07-30 02:36:13 +0400 | [diff] [blame] | 29 | #include <linux/err.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/spinlock.h> |
| 31 | #include <linux/kernel_stat.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <linux/delay.h> |
| 33 | #include <linux/cache.h> |
| 34 | #include <linux/interrupt.h> |
Christian Borntraeger | 3324e60 | 2009-03-26 15:23:56 +0100 | [diff] [blame] | 35 | #include <linux/irqflags.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include <linux/cpu.h> |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 37 | #include <linux/timex.h> |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 38 | #include <linux/bootmem.h> |
Michael Holzheu | 46b05d2 | 2007-02-21 10:55:21 +0100 | [diff] [blame] | 39 | #include <asm/ipl.h> |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 40 | #include <asm/setup.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #include <asm/sigp.h> |
| 42 | #include <asm/pgalloc.h> |
| 43 | #include <asm/irq.h> |
| 44 | #include <asm/s390_ext.h> |
| 45 | #include <asm/cpcmd.h> |
| 46 | #include <asm/tlbflush.h> |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 47 | #include <asm/timer.h> |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 48 | #include <asm/lowcore.h> |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 49 | #include <asm/sclp.h> |
Martin Schwidefsky | 76d4e00 | 2009-06-12 10:26:21 +0200 | [diff] [blame] | 50 | #include <asm/cputime.h> |
Martin Schwidefsky | c742b31 | 2008-12-31 15:11:42 +0100 | [diff] [blame] | 51 | #include <asm/vdso.h> |
Heiko Carstens | 4bb5e07 | 2009-09-11 10:29:03 +0200 | [diff] [blame] | 52 | #include <asm/cpu.h> |
Heiko Carstens | a806170 | 2008-04-17 07:46:26 +0200 | [diff] [blame] | 53 | #include "entry.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | static struct task_struct *current_set[NR_CPUS]; |
| 56 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 57 | static u8 smp_cpu_type; |
| 58 | static int smp_use_sigp_detection; |
| 59 | |
| 60 | enum s390_cpu_state { |
| 61 | CPU_STATE_STANDBY, |
| 62 | CPU_STATE_CONFIGURED, |
| 63 | }; |
| 64 | |
Heiko Carstens | dbd70fb | 2008-04-17 07:46:12 +0200 | [diff] [blame] | 65 | DEFINE_MUTEX(smp_cpu_state_mutex); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 66 | int smp_cpu_polarization[NR_CPUS]; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 67 | static int smp_cpu_state[NR_CPUS]; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 68 | static int cpu_management; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 69 | |
| 70 | static DEFINE_PER_CPU(struct cpu, cpu_devices); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 71 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | static void smp_ext_bitcall(int, ec_bit_sig); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
Heiko Carstens | 5c0b912 | 2009-09-11 10:29:05 +0200 | [diff] [blame] | 74 | static int cpu_stopped(int cpu) |
| 75 | { |
| 76 | __u32 status; |
| 77 | |
| 78 | switch (signal_processor_ps(&status, 0, cpu, sigp_sense)) { |
| 79 | case sigp_order_code_accepted: |
| 80 | case sigp_status_stored: |
| 81 | /* Check for stopped and check stop state */ |
| 82 | if (status & 0x50) |
| 83 | return 1; |
| 84 | break; |
| 85 | default: |
| 86 | break; |
| 87 | } |
| 88 | return 0; |
| 89 | } |
| 90 | |
Heiko Carstens | 677d762 | 2007-11-20 11:13:37 +0100 | [diff] [blame] | 91 | void smp_send_stop(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 93 | int cpu, rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
Heiko Carstens | 677d762 | 2007-11-20 11:13:37 +0100 | [diff] [blame] | 95 | /* Disable all interrupts/machine checks */ |
| 96 | __load_psw_mask(psw_kernel_bits & ~PSW_MASK_MCHECK); |
Christian Borntraeger | 3324e60 | 2009-03-26 15:23:56 +0100 | [diff] [blame] | 97 | trace_hardirqs_off(); |
Heiko Carstens | 677d762 | 2007-11-20 11:13:37 +0100 | [diff] [blame] | 98 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 99 | /* stop all processors */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | for_each_online_cpu(cpu) { |
| 101 | if (cpu == smp_processor_id()) |
| 102 | continue; |
| 103 | do { |
| 104 | rc = signal_processor(cpu, sigp_stop); |
| 105 | } while (rc == sigp_busy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | |
Heiko Carstens | 5c0b912 | 2009-09-11 10:29:05 +0200 | [diff] [blame] | 107 | while (!cpu_stopped(cpu)) |
Heiko Carstens | c6b5b84 | 2006-12-04 15:40:33 +0100 | [diff] [blame] | 108 | cpu_relax(); |
| 109 | } |
| 110 | } |
| 111 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | * This is the main routine where commands issued by other |
| 114 | * cpus are handled. |
| 115 | */ |
| 116 | |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 117 | static void do_ext_call_interrupt(__u16 code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 119 | unsigned long bits; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 120 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 121 | /* |
| 122 | * handle bit signal external calls |
| 123 | * |
| 124 | * For the ec_schedule signal we have to do nothing. All the work |
| 125 | * is done automatically when we return from the interrupt. |
| 126 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | bits = xchg(&S390_lowcore.ext_call_fast, 0); |
| 128 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 129 | if (test_bit(ec_call_function, &bits)) |
Heiko Carstens | ca9fc75 | 2008-12-25 13:38:39 +0100 | [diff] [blame] | 130 | generic_smp_call_function_interrupt(); |
| 131 | |
| 132 | if (test_bit(ec_call_function_single, &bits)) |
| 133 | generic_smp_call_function_single_interrupt(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | } |
| 135 | |
| 136 | /* |
| 137 | * Send an external call sigp to another cpu and return without waiting |
| 138 | * for its completion. |
| 139 | */ |
| 140 | static void smp_ext_bitcall(int cpu, ec_bit_sig sig) |
| 141 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 142 | /* |
| 143 | * Set signaling bit in lowcore of target cpu and kick it |
| 144 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast); |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 146 | while (signal_processor(cpu, sigp_emergency_signal) == sigp_busy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | udelay(10); |
| 148 | } |
| 149 | |
Rusty Russell | 630cd04 | 2009-09-24 09:34:45 -0600 | [diff] [blame] | 150 | void arch_send_call_function_ipi_mask(const struct cpumask *mask) |
Heiko Carstens | ca9fc75 | 2008-12-25 13:38:39 +0100 | [diff] [blame] | 151 | { |
| 152 | int cpu; |
| 153 | |
Rusty Russell | 630cd04 | 2009-09-24 09:34:45 -0600 | [diff] [blame] | 154 | for_each_cpu(cpu, mask) |
Heiko Carstens | ca9fc75 | 2008-12-25 13:38:39 +0100 | [diff] [blame] | 155 | smp_ext_bitcall(cpu, ec_call_function); |
| 156 | } |
| 157 | |
| 158 | void arch_send_call_function_single_ipi(int cpu) |
| 159 | { |
| 160 | smp_ext_bitcall(cpu, ec_call_function_single); |
| 161 | } |
| 162 | |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 163 | #ifndef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | /* |
| 165 | * this function sends a 'purge tlb' signal to another CPU. |
| 166 | */ |
Heiko Carstens | a806170 | 2008-04-17 07:46:26 +0200 | [diff] [blame] | 167 | static void smp_ptlb_callback(void *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | { |
Martin Schwidefsky | ba8a922 | 2007-10-22 12:52:44 +0200 | [diff] [blame] | 169 | __tlb_flush_local(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | } |
| 171 | |
| 172 | void smp_ptlb_all(void) |
| 173 | { |
Jens Axboe | 15c8b6c | 2008-05-09 09:39:44 +0200 | [diff] [blame] | 174 | on_each_cpu(smp_ptlb_callback, NULL, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | } |
| 176 | EXPORT_SYMBOL(smp_ptlb_all); |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 177 | #endif /* ! CONFIG_64BIT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | |
| 179 | /* |
| 180 | * this function sends a 'reschedule' IPI to another CPU. |
| 181 | * it goes straight through and wastes no time serializing |
| 182 | * anything. Worst case is that we lose a reschedule ... |
| 183 | */ |
| 184 | void smp_send_reschedule(int cpu) |
| 185 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 186 | smp_ext_bitcall(cpu, ec_schedule); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | } |
| 188 | |
| 189 | /* |
| 190 | * parameter area for the set/clear control bit callbacks |
| 191 | */ |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 192 | struct ec_creg_mask_parms { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 193 | unsigned long orvals[16]; |
| 194 | unsigned long andvals[16]; |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 195 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | |
| 197 | /* |
| 198 | * callback for setting/clearing control bits |
| 199 | */ |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 200 | static void smp_ctl_bit_callback(void *info) |
| 201 | { |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 202 | struct ec_creg_mask_parms *pp = info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | unsigned long cregs[16]; |
| 204 | int i; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 205 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 206 | __ctl_store(cregs, 0, 15); |
| 207 | for (i = 0; i <= 15; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | cregs[i] = (cregs[i] & pp->andvals[i]) | pp->orvals[i]; |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 209 | __ctl_load(cregs, 0, 15); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | } |
| 211 | |
| 212 | /* |
| 213 | * Set a bit in a control register of all cpus |
| 214 | */ |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 215 | void smp_ctl_set_bit(int cr, int bit) |
| 216 | { |
| 217 | struct ec_creg_mask_parms parms; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 219 | memset(&parms.orvals, 0, sizeof(parms.orvals)); |
| 220 | memset(&parms.andvals, 0xff, sizeof(parms.andvals)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | parms.orvals[cr] = 1 << bit; |
Jens Axboe | 15c8b6c | 2008-05-09 09:39:44 +0200 | [diff] [blame] | 222 | on_each_cpu(smp_ctl_bit_callback, &parms, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 223 | } |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 224 | EXPORT_SYMBOL(smp_ctl_set_bit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | |
| 226 | /* |
| 227 | * Clear a bit in a control register of all cpus |
| 228 | */ |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 229 | void smp_ctl_clear_bit(int cr, int bit) |
| 230 | { |
| 231 | struct ec_creg_mask_parms parms; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 233 | memset(&parms.orvals, 0, sizeof(parms.orvals)); |
| 234 | memset(&parms.andvals, 0xff, sizeof(parms.andvals)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | parms.andvals[cr] = ~(1L << bit); |
Jens Axboe | 15c8b6c | 2008-05-09 09:39:44 +0200 | [diff] [blame] | 236 | on_each_cpu(smp_ctl_bit_callback, &parms, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | } |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 238 | EXPORT_SYMBOL(smp_ctl_clear_bit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 240 | /* |
| 241 | * In early ipl state a temp. logically cpu number is needed, so the sigp |
| 242 | * functions can be used to sense other cpus. Since NR_CPUS is >= 2 on |
| 243 | * CONFIG_SMP and the ipl cpu is logical cpu 0, it must be 1. |
| 244 | */ |
| 245 | #define CPU_INIT_NO 1 |
| 246 | |
Michael Holzheu | 59f2e69 | 2009-03-26 15:24:46 +0100 | [diff] [blame] | 247 | #ifdef CONFIG_ZFCPDUMP |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 248 | |
| 249 | /* |
| 250 | * zfcpdump_prefix_array holds prefix registers for the following scenario: |
| 251 | * 64 bit zfcpdump kernel and 31 bit kernel which is to be dumped. We have to |
| 252 | * save its prefix registers, since they get lost, when switching from 31 bit |
| 253 | * to 64 bit. |
| 254 | */ |
| 255 | unsigned int zfcpdump_prefix_array[NR_CPUS + 1] \ |
| 256 | __attribute__((__section__(".data"))); |
| 257 | |
Heiko Carstens | 285f672 | 2007-07-10 11:24:13 +0200 | [diff] [blame] | 258 | static void __init smp_get_save_area(unsigned int cpu, unsigned int phy_cpu) |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 259 | { |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 260 | if (ipl_info.type != IPL_TYPE_FCP_DUMP) |
| 261 | return; |
Heiko Carstens | 285f672 | 2007-07-10 11:24:13 +0200 | [diff] [blame] | 262 | if (cpu >= NR_CPUS) { |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 263 | pr_warning("CPU %i exceeds the maximum %i and is excluded from " |
| 264 | "the dump\n", cpu, NR_CPUS - 1); |
Heiko Carstens | 285f672 | 2007-07-10 11:24:13 +0200 | [diff] [blame] | 265 | return; |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 266 | } |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 267 | zfcpdump_save_areas[cpu] = kmalloc(sizeof(union save_area), GFP_KERNEL); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 268 | __cpu_logical_map[CPU_INIT_NO] = (__u16) phy_cpu; |
| 269 | while (signal_processor(CPU_INIT_NO, sigp_stop_and_store_status) == |
| 270 | sigp_busy) |
Heiko Carstens | 285f672 | 2007-07-10 11:24:13 +0200 | [diff] [blame] | 271 | cpu_relax(); |
| 272 | memcpy(zfcpdump_save_areas[cpu], |
| 273 | (void *)(unsigned long) store_prefix() + SAVE_AREA_BASE, |
| 274 | SAVE_AREA_SIZE); |
| 275 | #ifdef CONFIG_64BIT |
| 276 | /* copy original prefix register */ |
| 277 | zfcpdump_save_areas[cpu]->s390x.pref_reg = zfcpdump_prefix_array[cpu]; |
| 278 | #endif |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 279 | } |
| 280 | |
| 281 | union save_area *zfcpdump_save_areas[NR_CPUS + 1]; |
| 282 | EXPORT_SYMBOL_GPL(zfcpdump_save_areas); |
| 283 | |
| 284 | #else |
Heiko Carstens | 285f672 | 2007-07-10 11:24:13 +0200 | [diff] [blame] | 285 | |
| 286 | static inline void smp_get_save_area(unsigned int cpu, unsigned int phy_cpu) { } |
| 287 | |
Michael Holzheu | 59f2e69 | 2009-03-26 15:24:46 +0100 | [diff] [blame] | 288 | #endif /* CONFIG_ZFCPDUMP */ |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 289 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 290 | static int cpu_known(int cpu_id) |
| 291 | { |
| 292 | int cpu; |
| 293 | |
| 294 | for_each_present_cpu(cpu) { |
| 295 | if (__cpu_logical_map[cpu] == cpu_id) |
| 296 | return 1; |
| 297 | } |
| 298 | return 0; |
| 299 | } |
| 300 | |
| 301 | static int smp_rescan_cpus_sigp(cpumask_t avail) |
| 302 | { |
| 303 | int cpu_id, logical_cpu; |
| 304 | |
Rusty Russell | 93632d1 | 2009-03-26 15:24:59 +0100 | [diff] [blame] | 305 | logical_cpu = cpumask_first(&avail); |
| 306 | if (logical_cpu >= nr_cpu_ids) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 307 | return 0; |
Heiko Carstens | 4bb5e07 | 2009-09-11 10:29:03 +0200 | [diff] [blame] | 308 | for (cpu_id = 0; cpu_id <= MAX_CPU_ADDRESS; cpu_id++) { |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 309 | if (cpu_known(cpu_id)) |
| 310 | continue; |
| 311 | __cpu_logical_map[logical_cpu] = cpu_id; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 312 | smp_cpu_polarization[logical_cpu] = POLARIZATION_UNKNWN; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 313 | if (!cpu_stopped(logical_cpu)) |
| 314 | continue; |
| 315 | cpu_set(logical_cpu, cpu_present_map); |
| 316 | smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED; |
Rusty Russell | 93632d1 | 2009-03-26 15:24:59 +0100 | [diff] [blame] | 317 | logical_cpu = cpumask_next(logical_cpu, &avail); |
| 318 | if (logical_cpu >= nr_cpu_ids) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 319 | break; |
| 320 | } |
| 321 | return 0; |
| 322 | } |
| 323 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 324 | static int smp_rescan_cpus_sclp(cpumask_t avail) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 325 | { |
| 326 | struct sclp_cpu_info *info; |
| 327 | int cpu_id, logical_cpu, cpu; |
| 328 | int rc; |
| 329 | |
Rusty Russell | 93632d1 | 2009-03-26 15:24:59 +0100 | [diff] [blame] | 330 | logical_cpu = cpumask_first(&avail); |
| 331 | if (logical_cpu >= nr_cpu_ids) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 332 | return 0; |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 333 | info = kmalloc(sizeof(*info), GFP_KERNEL); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 334 | if (!info) |
| 335 | return -ENOMEM; |
| 336 | rc = sclp_get_cpu_info(info); |
| 337 | if (rc) |
| 338 | goto out; |
| 339 | for (cpu = 0; cpu < info->combined; cpu++) { |
| 340 | if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type) |
| 341 | continue; |
| 342 | cpu_id = info->cpu[cpu].address; |
| 343 | if (cpu_known(cpu_id)) |
| 344 | continue; |
| 345 | __cpu_logical_map[logical_cpu] = cpu_id; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 346 | smp_cpu_polarization[logical_cpu] = POLARIZATION_UNKNWN; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 347 | cpu_set(logical_cpu, cpu_present_map); |
| 348 | if (cpu >= info->configured) |
| 349 | smp_cpu_state[logical_cpu] = CPU_STATE_STANDBY; |
| 350 | else |
| 351 | smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED; |
Rusty Russell | 93632d1 | 2009-03-26 15:24:59 +0100 | [diff] [blame] | 352 | logical_cpu = cpumask_next(logical_cpu, &avail); |
| 353 | if (logical_cpu >= nr_cpu_ids) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 354 | break; |
| 355 | } |
| 356 | out: |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 357 | kfree(info); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 358 | return rc; |
| 359 | } |
| 360 | |
Heiko Carstens | 1e48951 | 2008-04-30 13:38:37 +0200 | [diff] [blame] | 361 | static int __smp_rescan_cpus(void) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 362 | { |
| 363 | cpumask_t avail; |
| 364 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 365 | cpus_xor(avail, cpu_possible_map, cpu_present_map); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 366 | if (smp_use_sigp_detection) |
| 367 | return smp_rescan_cpus_sigp(avail); |
| 368 | else |
| 369 | return smp_rescan_cpus_sclp(avail); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 370 | } |
| 371 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 372 | static void __init smp_detect_cpus(void) |
| 373 | { |
| 374 | unsigned int cpu, c_cpus, s_cpus; |
| 375 | struct sclp_cpu_info *info; |
| 376 | u16 boot_cpu_addr, cpu_addr; |
| 377 | |
| 378 | c_cpus = 1; |
| 379 | s_cpus = 0; |
Martin Schwidefsky | 7b46848 | 2009-03-26 15:24:42 +0100 | [diff] [blame] | 380 | boot_cpu_addr = __cpu_logical_map[0]; |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 381 | info = kmalloc(sizeof(*info), GFP_KERNEL); |
| 382 | if (!info) |
| 383 | panic("smp_detect_cpus failed to allocate memory\n"); |
| 384 | /* Use sigp detection algorithm if sclp doesn't work. */ |
| 385 | if (sclp_get_cpu_info(info)) { |
| 386 | smp_use_sigp_detection = 1; |
Heiko Carstens | 4bb5e07 | 2009-09-11 10:29:03 +0200 | [diff] [blame] | 387 | for (cpu = 0; cpu <= MAX_CPU_ADDRESS; cpu++) { |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 388 | if (cpu == boot_cpu_addr) |
| 389 | continue; |
| 390 | __cpu_logical_map[CPU_INIT_NO] = cpu; |
| 391 | if (!cpu_stopped(CPU_INIT_NO)) |
| 392 | continue; |
| 393 | smp_get_save_area(c_cpus, cpu); |
| 394 | c_cpus++; |
| 395 | } |
| 396 | goto out; |
| 397 | } |
| 398 | |
| 399 | if (info->has_cpu_type) { |
| 400 | for (cpu = 0; cpu < info->combined; cpu++) { |
| 401 | if (info->cpu[cpu].address == boot_cpu_addr) { |
| 402 | smp_cpu_type = info->cpu[cpu].type; |
| 403 | break; |
| 404 | } |
| 405 | } |
| 406 | } |
| 407 | |
| 408 | for (cpu = 0; cpu < info->combined; cpu++) { |
| 409 | if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type) |
| 410 | continue; |
| 411 | cpu_addr = info->cpu[cpu].address; |
| 412 | if (cpu_addr == boot_cpu_addr) |
| 413 | continue; |
| 414 | __cpu_logical_map[CPU_INIT_NO] = cpu_addr; |
| 415 | if (!cpu_stopped(CPU_INIT_NO)) { |
| 416 | s_cpus++; |
| 417 | continue; |
| 418 | } |
| 419 | smp_get_save_area(c_cpus, cpu_addr); |
| 420 | c_cpus++; |
| 421 | } |
| 422 | out: |
| 423 | kfree(info); |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 424 | pr_info("%d configured CPUs, %d standby CPUs\n", c_cpus, s_cpus); |
Martin Schwidefsky | 9d40d2e | 2008-01-26 14:11:31 +0100 | [diff] [blame] | 425 | get_online_cpus(); |
Heiko Carstens | 1e48951 | 2008-04-30 13:38:37 +0200 | [diff] [blame] | 426 | __smp_rescan_cpus(); |
Martin Schwidefsky | 9d40d2e | 2008-01-26 14:11:31 +0100 | [diff] [blame] | 427 | put_online_cpus(); |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 428 | } |
| 429 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | /* |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 431 | * Activate a secondary processor. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | */ |
Heiko Carstens | ea1f4ee | 2007-05-31 17:38:05 +0200 | [diff] [blame] | 433 | int __cpuinit start_secondary(void *cpuvoid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 435 | /* Setup the cpu */ |
| 436 | cpu_init(); |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 437 | preempt_disable(); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 438 | /* Enable TOD clock interrupts on the secondary cpu. */ |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 439 | init_cpu_timer(); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 440 | /* Enable cpu timer interrupts on the secondary cpu. */ |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 441 | init_cpu_vtimer(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | /* Enable pfault pseudo page faults on this cpu. */ |
Heiko Carstens | 29b08d2 | 2006-12-04 15:40:40 +0100 | [diff] [blame] | 443 | pfault_init(); |
| 444 | |
Manfred Spraul | e545a61 | 2008-09-07 16:57:22 +0200 | [diff] [blame] | 445 | /* call cpu notifiers */ |
| 446 | notify_cpu_starting(smp_processor_id()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | /* Mark this cpu as online */ |
Heiko Carstens | ca9fc75 | 2008-12-25 13:38:39 +0100 | [diff] [blame] | 448 | ipi_call_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 449 | cpu_set(smp_processor_id(), cpu_online_map); |
Heiko Carstens | ca9fc75 | 2008-12-25 13:38:39 +0100 | [diff] [blame] | 450 | ipi_call_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | /* Switch on interrupts */ |
| 452 | local_irq_enable(); |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 453 | /* Print info about this processor */ |
Martin Schwidefsky | 7b46848 | 2009-03-26 15:24:42 +0100 | [diff] [blame] | 454 | print_cpu_info(); |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 455 | /* cpu_idle will call schedule for us */ |
| 456 | cpu_idle(); |
| 457 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | } |
| 459 | |
| 460 | static void __init smp_create_idle(unsigned int cpu) |
| 461 | { |
| 462 | struct task_struct *p; |
| 463 | |
| 464 | /* |
| 465 | * don't care about the psw and regs settings since we'll never |
| 466 | * reschedule the forked task. |
| 467 | */ |
| 468 | p = fork_idle(cpu); |
| 469 | if (IS_ERR(p)) |
| 470 | panic("failed fork for CPU %u: %li", cpu, PTR_ERR(p)); |
| 471 | current_set[cpu] = p; |
| 472 | } |
| 473 | |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 474 | static int __cpuinit smp_alloc_lowcore(int cpu) |
| 475 | { |
| 476 | unsigned long async_stack, panic_stack; |
| 477 | struct _lowcore *lowcore; |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 478 | |
Heiko Carstens | 3fd26a7 | 2009-09-22 22:58:49 +0200 | [diff] [blame] | 479 | lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, LC_ORDER); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 480 | if (!lowcore) |
| 481 | return -ENOMEM; |
| 482 | async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 483 | panic_stack = __get_free_page(GFP_KERNEL); |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 484 | if (!panic_stack || !async_stack) |
| 485 | goto out; |
Heiko Carstens | 98c7b38 | 2008-03-05 12:37:09 +0100 | [diff] [blame] | 486 | memcpy(lowcore, &S390_lowcore, 512); |
| 487 | memset((char *)lowcore + 512, 0, sizeof(*lowcore) - 512); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 488 | lowcore->async_stack = async_stack + ASYNC_SIZE; |
| 489 | lowcore->panic_stack = panic_stack + PAGE_SIZE; |
| 490 | |
| 491 | #ifndef CONFIG_64BIT |
| 492 | if (MACHINE_HAS_IEEE) { |
| 493 | unsigned long save_area; |
| 494 | |
| 495 | save_area = get_zeroed_page(GFP_KERNEL); |
| 496 | if (!save_area) |
Martin Schwidefsky | 33b1d09 | 2008-12-25 13:39:27 +0100 | [diff] [blame] | 497 | goto out; |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 498 | lowcore->extended_save_area_addr = (u32) save_area; |
| 499 | } |
Martin Schwidefsky | c742b31 | 2008-12-31 15:11:42 +0100 | [diff] [blame] | 500 | #else |
| 501 | if (vdso_alloc_per_cpu(cpu, lowcore)) |
| 502 | goto out; |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 503 | #endif |
| 504 | lowcore_ptr[cpu] = lowcore; |
| 505 | return 0; |
| 506 | |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 507 | out: |
Martin Schwidefsky | 33b1d09 | 2008-12-25 13:39:27 +0100 | [diff] [blame] | 508 | free_page(panic_stack); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 509 | free_pages(async_stack, ASYNC_ORDER); |
Heiko Carstens | 3fd26a7 | 2009-09-22 22:58:49 +0200 | [diff] [blame] | 510 | free_pages((unsigned long) lowcore, LC_ORDER); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 511 | return -ENOMEM; |
| 512 | } |
| 513 | |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 514 | static void smp_free_lowcore(int cpu) |
| 515 | { |
| 516 | struct _lowcore *lowcore; |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 517 | |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 518 | lowcore = lowcore_ptr[cpu]; |
| 519 | #ifndef CONFIG_64BIT |
| 520 | if (MACHINE_HAS_IEEE) |
| 521 | free_page((unsigned long) lowcore->extended_save_area_addr); |
Martin Schwidefsky | c742b31 | 2008-12-31 15:11:42 +0100 | [diff] [blame] | 522 | #else |
| 523 | vdso_free_per_cpu(cpu, lowcore); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 524 | #endif |
| 525 | free_page(lowcore->panic_stack - PAGE_SIZE); |
| 526 | free_pages(lowcore->async_stack - ASYNC_SIZE, ASYNC_ORDER); |
Heiko Carstens | 3fd26a7 | 2009-09-22 22:58:49 +0200 | [diff] [blame] | 527 | free_pages((unsigned long) lowcore, LC_ORDER); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 528 | lowcore_ptr[cpu] = NULL; |
| 529 | } |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 530 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | /* Upping and downing of CPUs */ |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 532 | int __cpuinit __cpu_up(unsigned int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 533 | { |
| 534 | struct task_struct *idle; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 535 | struct _lowcore *cpu_lowcore; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 536 | struct stack_frame *sf; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 537 | sigp_ccode ccode; |
Heiko Carstens | d0d3cdf | 2009-03-26 15:24:53 +0100 | [diff] [blame] | 538 | u32 lowcore; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 540 | if (smp_cpu_state[cpu] != CPU_STATE_CONFIGURED) |
| 541 | return -EIO; |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 542 | if (smp_alloc_lowcore(cpu)) |
| 543 | return -ENOMEM; |
Heiko Carstens | d0d3cdf | 2009-03-26 15:24:53 +0100 | [diff] [blame] | 544 | do { |
| 545 | ccode = signal_processor(cpu, sigp_initial_cpu_reset); |
| 546 | if (ccode == sigp_busy) |
| 547 | udelay(10); |
| 548 | if (ccode == sigp_not_operational) |
| 549 | goto err_out; |
| 550 | } while (ccode == sigp_busy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | |
Heiko Carstens | d0d3cdf | 2009-03-26 15:24:53 +0100 | [diff] [blame] | 552 | lowcore = (u32)(unsigned long)lowcore_ptr[cpu]; |
| 553 | while (signal_processor_p(lowcore, cpu, sigp_set_prefix) == sigp_busy) |
| 554 | udelay(10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | |
| 556 | idle = current_set[cpu]; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 557 | cpu_lowcore = lowcore_ptr[cpu]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | cpu_lowcore->kernel_stack = (unsigned long) |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 559 | task_stack_page(idle) + THREAD_SIZE; |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 560 | cpu_lowcore->thread_info = (unsigned long) task_thread_info(idle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | sf = (struct stack_frame *) (cpu_lowcore->kernel_stack |
| 562 | - sizeof(struct pt_regs) |
| 563 | - sizeof(struct stack_frame)); |
| 564 | memset(sf, 0, sizeof(struct stack_frame)); |
| 565 | sf->gprs[9] = (unsigned long) sf; |
| 566 | cpu_lowcore->save_area[15] = (unsigned long) sf; |
Segher Boessenkool | 24d3e21 | 2008-06-10 10:03:23 +0200 | [diff] [blame] | 567 | __ctl_store(cpu_lowcore->cregs_save_area, 0, 15); |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 568 | asm volatile( |
| 569 | " stam 0,15,0(%0)" |
| 570 | : : "a" (&cpu_lowcore->access_regs_save_area) : "memory"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | cpu_lowcore->percpu_offset = __per_cpu_offset[cpu]; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 572 | cpu_lowcore->current_task = (unsigned long) idle; |
Martin Schwidefsky | 7b46848 | 2009-03-26 15:24:42 +0100 | [diff] [blame] | 573 | cpu_lowcore->cpu_nr = cpu; |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 574 | cpu_lowcore->kernel_asce = S390_lowcore.kernel_asce; |
Christian Ehrhardt | 25097bf | 2009-04-14 15:36:16 +0200 | [diff] [blame] | 575 | cpu_lowcore->machine_flags = S390_lowcore.machine_flags; |
Heiko Carstens | dfd9f7a | 2009-06-12 10:26:44 +0200 | [diff] [blame] | 576 | cpu_lowcore->ftrace_func = S390_lowcore.ftrace_func; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | eieio(); |
Michael Ryan | 699ff13 | 2006-03-24 03:15:17 -0800 | [diff] [blame] | 578 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 579 | while (signal_processor(cpu, sigp_restart) == sigp_busy) |
Michael Ryan | 699ff13 | 2006-03-24 03:15:17 -0800 | [diff] [blame] | 580 | udelay(10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | |
| 582 | while (!cpu_online(cpu)) |
| 583 | cpu_relax(); |
| 584 | return 0; |
Heiko Carstens | d0d3cdf | 2009-03-26 15:24:53 +0100 | [diff] [blame] | 585 | |
| 586 | err_out: |
| 587 | smp_free_lowcore(cpu); |
| 588 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | } |
| 590 | |
Heiko Carstens | 37a3302 | 2006-02-17 13:52:47 -0800 | [diff] [blame] | 591 | static int __init setup_possible_cpus(char *s) |
| 592 | { |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 593 | int pcpus, cpu; |
| 594 | |
| 595 | pcpus = simple_strtoul(s, NULL, 0); |
Heiko Carstens | 88e0128 | 2009-04-14 15:36:25 +0200 | [diff] [blame] | 596 | init_cpu_possible(cpumask_of(0)); |
| 597 | for (cpu = 1; cpu < pcpus && cpu < nr_cpu_ids; cpu++) |
Rusty Russell | def6cfb | 2009-03-26 15:25:00 +0100 | [diff] [blame] | 598 | set_cpu_possible(cpu, true); |
Heiko Carstens | 37a3302 | 2006-02-17 13:52:47 -0800 | [diff] [blame] | 599 | return 0; |
| 600 | } |
| 601 | early_param("possible_cpus", setup_possible_cpus); |
| 602 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 603 | #ifdef CONFIG_HOTPLUG_CPU |
| 604 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 605 | int __cpu_disable(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | { |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 607 | struct ec_creg_mask_parms cr_parms; |
Zwane Mwaikambo | f370513 | 2005-06-25 14:54:50 -0700 | [diff] [blame] | 608 | int cpu = smp_processor_id(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | |
Zwane Mwaikambo | f370513 | 2005-06-25 14:54:50 -0700 | [diff] [blame] | 610 | cpu_clear(cpu, cpu_online_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 612 | /* Disable pfault pseudo page faults on this cpu. */ |
Heiko Carstens | 29b08d2 | 2006-12-04 15:40:40 +0100 | [diff] [blame] | 613 | pfault_fini(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 615 | memset(&cr_parms.orvals, 0, sizeof(cr_parms.orvals)); |
| 616 | memset(&cr_parms.andvals, 0xff, sizeof(cr_parms.andvals)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 618 | /* disable all external interrupts */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | cr_parms.orvals[0] = 0; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 620 | cr_parms.andvals[0] = ~(1 << 15 | 1 << 14 | 1 << 13 | 1 << 12 | |
| 621 | 1 << 11 | 1 << 10 | 1 << 6 | 1 << 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 622 | /* disable all I/O interrupts */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | cr_parms.orvals[6] = 0; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 624 | cr_parms.andvals[6] = ~(1 << 31 | 1 << 30 | 1 << 29 | 1 << 28 | |
| 625 | 1 << 27 | 1 << 26 | 1 << 25 | 1 << 24); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | /* disable most machine checks */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | cr_parms.orvals[14] = 0; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 628 | cr_parms.andvals[14] = ~(1 << 28 | 1 << 27 | 1 << 26 | |
| 629 | 1 << 25 | 1 << 24); |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 630 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | smp_ctl_bit_callback(&cr_parms); |
| 632 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | return 0; |
| 634 | } |
| 635 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 636 | void __cpu_die(unsigned int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | { |
| 638 | /* Wait until target cpu is down */ |
Heiko Carstens | 5c0b912 | 2009-09-11 10:29:05 +0200 | [diff] [blame] | 639 | while (!cpu_stopped(cpu)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | cpu_relax(); |
Heiko Carstens | 4f8048e | 2009-10-29 15:04:09 +0100 | [diff] [blame] | 641 | while (signal_processor_p(0, cpu, sigp_set_prefix) == sigp_busy) |
| 642 | udelay(10); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 643 | smp_free_lowcore(cpu); |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 644 | pr_info("Processor %d stopped\n", cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | } |
| 646 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 647 | void cpu_die(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | { |
| 649 | idle_task_exit(); |
Heiko Carstens | f8501ba | 2009-10-29 15:04:13 +0100 | [diff] [blame^] | 650 | while (signal_processor(smp_processor_id(), sigp_stop) == sigp_busy) |
| 651 | cpu_relax(); |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 652 | for (;;); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | } |
| 654 | |
Heiko Carstens | 255acee | 2006-02-17 13:52:46 -0800 | [diff] [blame] | 655 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 656 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 657 | void __init smp_prepare_cpus(unsigned int max_cpus) |
| 658 | { |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 659 | #ifndef CONFIG_64BIT |
| 660 | unsigned long save_area = 0; |
| 661 | #endif |
| 662 | unsigned long async_stack, panic_stack; |
| 663 | struct _lowcore *lowcore; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 664 | unsigned int cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 666 | smp_detect_cpus(); |
| 667 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 668 | /* request the 0x1201 emergency signal external interrupt */ |
| 669 | if (register_external_interrupt(0x1201, do_ext_call_interrupt) != 0) |
| 670 | panic("Couldn't request external interrupt 0x1201"); |
Martin Schwidefsky | 7b46848 | 2009-03-26 15:24:42 +0100 | [diff] [blame] | 671 | print_cpu_info(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 673 | /* Reallocate current lowcore, but keep its contents. */ |
Heiko Carstens | 3fd26a7 | 2009-09-22 22:58:49 +0200 | [diff] [blame] | 674 | lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, LC_ORDER); |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 675 | panic_stack = __get_free_page(GFP_KERNEL); |
| 676 | async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER); |
Martin Schwidefsky | c742b31 | 2008-12-31 15:11:42 +0100 | [diff] [blame] | 677 | BUG_ON(!lowcore || !panic_stack || !async_stack); |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 678 | #ifndef CONFIG_64BIT |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 679 | if (MACHINE_HAS_IEEE) |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 680 | save_area = get_zeroed_page(GFP_KERNEL); |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 681 | #endif |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 682 | local_irq_disable(); |
| 683 | local_mcck_disable(); |
| 684 | lowcore_ptr[smp_processor_id()] = lowcore; |
| 685 | *lowcore = S390_lowcore; |
| 686 | lowcore->panic_stack = panic_stack + PAGE_SIZE; |
| 687 | lowcore->async_stack = async_stack + ASYNC_SIZE; |
| 688 | #ifndef CONFIG_64BIT |
| 689 | if (MACHINE_HAS_IEEE) |
| 690 | lowcore->extended_save_area_addr = (u32) save_area; |
| 691 | #endif |
| 692 | set_prefix((u32)(unsigned long) lowcore); |
| 693 | local_mcck_enable(); |
| 694 | local_irq_enable(); |
Heiko Carstens | 3a6ba46 | 2009-07-24 12:39:51 +0200 | [diff] [blame] | 695 | #ifdef CONFIG_64BIT |
| 696 | if (vdso_alloc_per_cpu(smp_processor_id(), &S390_lowcore)) |
| 697 | BUG(); |
| 698 | #endif |
KAMEZAWA Hiroyuki | 97db7fb | 2006-03-31 02:30:26 -0800 | [diff] [blame] | 699 | for_each_possible_cpu(cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 700 | if (cpu != smp_processor_id()) |
| 701 | smp_create_idle(cpu); |
| 702 | } |
| 703 | |
Heiko Carstens | ea1f4ee | 2007-05-31 17:38:05 +0200 | [diff] [blame] | 704 | void __init smp_prepare_boot_cpu(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | { |
| 706 | BUG_ON(smp_processor_id() != 0); |
| 707 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 708 | current_thread_info()->cpu = 0; |
| 709 | cpu_set(0, cpu_present_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | cpu_set(0, cpu_online_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 711 | S390_lowcore.percpu_offset = __per_cpu_offset[0]; |
| 712 | current_set[0] = current; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 713 | smp_cpu_state[0] = CPU_STATE_CONFIGURED; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 714 | smp_cpu_polarization[0] = POLARIZATION_UNKNWN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | } |
| 716 | |
Heiko Carstens | ea1f4ee | 2007-05-31 17:38:05 +0200 | [diff] [blame] | 717 | void __init smp_cpus_done(unsigned int max_cpus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | } |
| 720 | |
| 721 | /* |
| 722 | * the frequency of the profiling timer can be changed |
| 723 | * by writing a multiplier value into /proc/profile. |
| 724 | * |
| 725 | * usually you want to run this on all CPUs ;) |
| 726 | */ |
| 727 | int setup_profiling_timer(unsigned int multiplier) |
| 728 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 729 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | } |
| 731 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 732 | #ifdef CONFIG_HOTPLUG_CPU |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 733 | static ssize_t cpu_configure_show(struct sys_device *dev, |
| 734 | struct sysdev_attribute *attr, char *buf) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 735 | { |
| 736 | ssize_t count; |
| 737 | |
| 738 | mutex_lock(&smp_cpu_state_mutex); |
| 739 | count = sprintf(buf, "%d\n", smp_cpu_state[dev->id]); |
| 740 | mutex_unlock(&smp_cpu_state_mutex); |
| 741 | return count; |
| 742 | } |
| 743 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 744 | static ssize_t cpu_configure_store(struct sys_device *dev, |
| 745 | struct sysdev_attribute *attr, |
| 746 | const char *buf, size_t count) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 747 | { |
| 748 | int cpu = dev->id; |
| 749 | int val, rc; |
| 750 | char delim; |
| 751 | |
| 752 | if (sscanf(buf, "%d %c", &val, &delim) != 1) |
| 753 | return -EINVAL; |
| 754 | if (val != 0 && val != 1) |
| 755 | return -EINVAL; |
| 756 | |
Martin Schwidefsky | 9d40d2e | 2008-01-26 14:11:31 +0100 | [diff] [blame] | 757 | get_online_cpus(); |
Heiko Carstens | 0b18d31 | 2008-04-30 13:38:36 +0200 | [diff] [blame] | 758 | mutex_lock(&smp_cpu_state_mutex); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 759 | rc = -EBUSY; |
| 760 | if (cpu_online(cpu)) |
| 761 | goto out; |
| 762 | rc = 0; |
| 763 | switch (val) { |
| 764 | case 0: |
| 765 | if (smp_cpu_state[cpu] == CPU_STATE_CONFIGURED) { |
| 766 | rc = sclp_cpu_deconfigure(__cpu_logical_map[cpu]); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 767 | if (!rc) { |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 768 | smp_cpu_state[cpu] = CPU_STATE_STANDBY; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 769 | smp_cpu_polarization[cpu] = POLARIZATION_UNKNWN; |
| 770 | } |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 771 | } |
| 772 | break; |
| 773 | case 1: |
| 774 | if (smp_cpu_state[cpu] == CPU_STATE_STANDBY) { |
| 775 | rc = sclp_cpu_configure(__cpu_logical_map[cpu]); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 776 | if (!rc) { |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 777 | smp_cpu_state[cpu] = CPU_STATE_CONFIGURED; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 778 | smp_cpu_polarization[cpu] = POLARIZATION_UNKNWN; |
| 779 | } |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 780 | } |
| 781 | break; |
| 782 | default: |
| 783 | break; |
| 784 | } |
| 785 | out: |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 786 | mutex_unlock(&smp_cpu_state_mutex); |
Heiko Carstens | 0b18d31 | 2008-04-30 13:38:36 +0200 | [diff] [blame] | 787 | put_online_cpus(); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 788 | return rc ? rc : count; |
| 789 | } |
| 790 | static SYSDEV_ATTR(configure, 0644, cpu_configure_show, cpu_configure_store); |
| 791 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 792 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 793 | static ssize_t cpu_polarization_show(struct sys_device *dev, |
| 794 | struct sysdev_attribute *attr, char *buf) |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 795 | { |
| 796 | int cpu = dev->id; |
| 797 | ssize_t count; |
| 798 | |
| 799 | mutex_lock(&smp_cpu_state_mutex); |
| 800 | switch (smp_cpu_polarization[cpu]) { |
| 801 | case POLARIZATION_HRZ: |
| 802 | count = sprintf(buf, "horizontal\n"); |
| 803 | break; |
| 804 | case POLARIZATION_VL: |
| 805 | count = sprintf(buf, "vertical:low\n"); |
| 806 | break; |
| 807 | case POLARIZATION_VM: |
| 808 | count = sprintf(buf, "vertical:medium\n"); |
| 809 | break; |
| 810 | case POLARIZATION_VH: |
| 811 | count = sprintf(buf, "vertical:high\n"); |
| 812 | break; |
| 813 | default: |
| 814 | count = sprintf(buf, "unknown\n"); |
| 815 | break; |
| 816 | } |
| 817 | mutex_unlock(&smp_cpu_state_mutex); |
| 818 | return count; |
| 819 | } |
| 820 | static SYSDEV_ATTR(polarization, 0444, cpu_polarization_show, NULL); |
| 821 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 822 | static ssize_t show_cpu_address(struct sys_device *dev, |
| 823 | struct sysdev_attribute *attr, char *buf) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 824 | { |
| 825 | return sprintf(buf, "%d\n", __cpu_logical_map[dev->id]); |
| 826 | } |
| 827 | static SYSDEV_ATTR(address, 0444, show_cpu_address, NULL); |
| 828 | |
| 829 | |
| 830 | static struct attribute *cpu_common_attrs[] = { |
| 831 | #ifdef CONFIG_HOTPLUG_CPU |
| 832 | &attr_configure.attr, |
| 833 | #endif |
| 834 | &attr_address.attr, |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 835 | &attr_polarization.attr, |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 836 | NULL, |
| 837 | }; |
| 838 | |
| 839 | static struct attribute_group cpu_common_attr_group = { |
| 840 | .attrs = cpu_common_attrs, |
| 841 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 843 | static ssize_t show_capability(struct sys_device *dev, |
| 844 | struct sysdev_attribute *attr, char *buf) |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 845 | { |
| 846 | unsigned int capability; |
| 847 | int rc; |
| 848 | |
| 849 | rc = get_cpu_capability(&capability); |
| 850 | if (rc) |
| 851 | return rc; |
| 852 | return sprintf(buf, "%u\n", capability); |
| 853 | } |
| 854 | static SYSDEV_ATTR(capability, 0444, show_capability, NULL); |
| 855 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 856 | static ssize_t show_idle_count(struct sys_device *dev, |
| 857 | struct sysdev_attribute *attr, char *buf) |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 858 | { |
| 859 | struct s390_idle_data *idle; |
| 860 | unsigned long long idle_count; |
Martin Schwidefsky | e98bbaa | 2009-06-22 12:08:20 +0200 | [diff] [blame] | 861 | unsigned int sequence; |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 862 | |
| 863 | idle = &per_cpu(s390_idle, dev->id); |
Martin Schwidefsky | e98bbaa | 2009-06-22 12:08:20 +0200 | [diff] [blame] | 864 | repeat: |
| 865 | sequence = idle->sequence; |
| 866 | smp_rmb(); |
| 867 | if (sequence & 1) |
| 868 | goto repeat; |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 869 | idle_count = idle->idle_count; |
Martin Schwidefsky | 6f43092 | 2008-12-31 15:11:40 +0100 | [diff] [blame] | 870 | if (idle->idle_enter) |
| 871 | idle_count++; |
Martin Schwidefsky | e98bbaa | 2009-06-22 12:08:20 +0200 | [diff] [blame] | 872 | smp_rmb(); |
| 873 | if (idle->sequence != sequence) |
| 874 | goto repeat; |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 875 | return sprintf(buf, "%llu\n", idle_count); |
| 876 | } |
| 877 | static SYSDEV_ATTR(idle_count, 0444, show_idle_count, NULL); |
| 878 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 879 | static ssize_t show_idle_time(struct sys_device *dev, |
| 880 | struct sysdev_attribute *attr, char *buf) |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 881 | { |
| 882 | struct s390_idle_data *idle; |
Martin Schwidefsky | 6f43092 | 2008-12-31 15:11:40 +0100 | [diff] [blame] | 883 | unsigned long long now, idle_time, idle_enter; |
Martin Schwidefsky | e98bbaa | 2009-06-22 12:08:20 +0200 | [diff] [blame] | 884 | unsigned int sequence; |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 885 | |
| 886 | idle = &per_cpu(s390_idle, dev->id); |
Martin Schwidefsky | 6f43092 | 2008-12-31 15:11:40 +0100 | [diff] [blame] | 887 | now = get_clock(); |
Martin Schwidefsky | e98bbaa | 2009-06-22 12:08:20 +0200 | [diff] [blame] | 888 | repeat: |
| 889 | sequence = idle->sequence; |
| 890 | smp_rmb(); |
| 891 | if (sequence & 1) |
| 892 | goto repeat; |
Martin Schwidefsky | 6f43092 | 2008-12-31 15:11:40 +0100 | [diff] [blame] | 893 | idle_time = idle->idle_time; |
| 894 | idle_enter = idle->idle_enter; |
| 895 | if (idle_enter != 0ULL && idle_enter < now) |
| 896 | idle_time += now - idle_enter; |
Martin Schwidefsky | e98bbaa | 2009-06-22 12:08:20 +0200 | [diff] [blame] | 897 | smp_rmb(); |
| 898 | if (idle->sequence != sequence) |
| 899 | goto repeat; |
Martin Schwidefsky | 6f43092 | 2008-12-31 15:11:40 +0100 | [diff] [blame] | 900 | return sprintf(buf, "%llu\n", idle_time >> 12); |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 901 | } |
Heiko Carstens | 69d39d6 | 2007-11-05 11:10:13 +0100 | [diff] [blame] | 902 | static SYSDEV_ATTR(idle_time_us, 0444, show_idle_time, NULL); |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 903 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 904 | static struct attribute *cpu_online_attrs[] = { |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 905 | &attr_capability.attr, |
| 906 | &attr_idle_count.attr, |
Heiko Carstens | 69d39d6 | 2007-11-05 11:10:13 +0100 | [diff] [blame] | 907 | &attr_idle_time_us.attr, |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 908 | NULL, |
| 909 | }; |
| 910 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 911 | static struct attribute_group cpu_online_attr_group = { |
| 912 | .attrs = cpu_online_attrs, |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 913 | }; |
| 914 | |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 915 | static int __cpuinit smp_cpu_notify(struct notifier_block *self, |
| 916 | unsigned long action, void *hcpu) |
| 917 | { |
| 918 | unsigned int cpu = (unsigned int)(long)hcpu; |
| 919 | struct cpu *c = &per_cpu(cpu_devices, cpu); |
| 920 | struct sys_device *s = &c->sysdev; |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 921 | struct s390_idle_data *idle; |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 922 | |
| 923 | switch (action) { |
| 924 | case CPU_ONLINE: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 925 | case CPU_ONLINE_FROZEN: |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 926 | idle = &per_cpu(s390_idle, cpu); |
Martin Schwidefsky | e98bbaa | 2009-06-22 12:08:20 +0200 | [diff] [blame] | 927 | memset(idle, 0, sizeof(struct s390_idle_data)); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 928 | if (sysfs_create_group(&s->kobj, &cpu_online_attr_group)) |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 929 | return NOTIFY_BAD; |
| 930 | break; |
| 931 | case CPU_DEAD: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 932 | case CPU_DEAD_FROZEN: |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 933 | sysfs_remove_group(&s->kobj, &cpu_online_attr_group); |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 934 | break; |
| 935 | } |
| 936 | return NOTIFY_OK; |
| 937 | } |
| 938 | |
| 939 | static struct notifier_block __cpuinitdata smp_cpu_nb = { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 940 | .notifier_call = smp_cpu_notify, |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 941 | }; |
| 942 | |
Heiko Carstens | 2bc89b5 | 2008-02-05 16:50:40 +0100 | [diff] [blame] | 943 | static int __devinit smp_add_present_cpu(int cpu) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 944 | { |
| 945 | struct cpu *c = &per_cpu(cpu_devices, cpu); |
| 946 | struct sys_device *s = &c->sysdev; |
| 947 | int rc; |
| 948 | |
| 949 | c->hotpluggable = 1; |
| 950 | rc = register_cpu(c, cpu); |
| 951 | if (rc) |
| 952 | goto out; |
| 953 | rc = sysfs_create_group(&s->kobj, &cpu_common_attr_group); |
| 954 | if (rc) |
| 955 | goto out_cpu; |
| 956 | if (!cpu_online(cpu)) |
| 957 | goto out; |
| 958 | rc = sysfs_create_group(&s->kobj, &cpu_online_attr_group); |
| 959 | if (!rc) |
| 960 | return 0; |
| 961 | sysfs_remove_group(&s->kobj, &cpu_common_attr_group); |
| 962 | out_cpu: |
| 963 | #ifdef CONFIG_HOTPLUG_CPU |
| 964 | unregister_cpu(c); |
| 965 | #endif |
| 966 | out: |
| 967 | return rc; |
| 968 | } |
| 969 | |
| 970 | #ifdef CONFIG_HOTPLUG_CPU |
Heiko Carstens | 1e48951 | 2008-04-30 13:38:37 +0200 | [diff] [blame] | 971 | |
Heiko Carstens | 67060d9 | 2008-05-30 10:03:27 +0200 | [diff] [blame] | 972 | int __ref smp_rescan_cpus(void) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 973 | { |
| 974 | cpumask_t newcpus; |
| 975 | int cpu; |
| 976 | int rc; |
| 977 | |
Martin Schwidefsky | 9d40d2e | 2008-01-26 14:11:31 +0100 | [diff] [blame] | 978 | get_online_cpus(); |
Heiko Carstens | 0b18d31 | 2008-04-30 13:38:36 +0200 | [diff] [blame] | 979 | mutex_lock(&smp_cpu_state_mutex); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 980 | newcpus = cpu_present_map; |
Heiko Carstens | 1e48951 | 2008-04-30 13:38:37 +0200 | [diff] [blame] | 981 | rc = __smp_rescan_cpus(); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 982 | if (rc) |
| 983 | goto out; |
| 984 | cpus_andnot(newcpus, cpu_present_map, newcpus); |
| 985 | for_each_cpu_mask(cpu, newcpus) { |
| 986 | rc = smp_add_present_cpu(cpu); |
| 987 | if (rc) |
| 988 | cpu_clear(cpu, cpu_present_map); |
| 989 | } |
| 990 | rc = 0; |
| 991 | out: |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 992 | mutex_unlock(&smp_cpu_state_mutex); |
Heiko Carstens | 0b18d31 | 2008-04-30 13:38:36 +0200 | [diff] [blame] | 993 | put_online_cpus(); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 994 | if (!cpus_empty(newcpus)) |
| 995 | topology_schedule_update(); |
Heiko Carstens | 1e48951 | 2008-04-30 13:38:37 +0200 | [diff] [blame] | 996 | return rc; |
| 997 | } |
| 998 | |
Heiko Carstens | da5aae7 | 2008-10-28 11:10:16 +0100 | [diff] [blame] | 999 | static ssize_t __ref rescan_store(struct sysdev_class *class, const char *buf, |
Heiko Carstens | 1e48951 | 2008-04-30 13:38:37 +0200 | [diff] [blame] | 1000 | size_t count) |
| 1001 | { |
| 1002 | int rc; |
| 1003 | |
| 1004 | rc = smp_rescan_cpus(); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1005 | return rc ? rc : count; |
| 1006 | } |
Heiko Carstens | da5aae7 | 2008-10-28 11:10:16 +0100 | [diff] [blame] | 1007 | static SYSDEV_CLASS_ATTR(rescan, 0200, NULL, rescan_store); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1008 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 1009 | |
Heiko Carstens | da5aae7 | 2008-10-28 11:10:16 +0100 | [diff] [blame] | 1010 | static ssize_t dispatching_show(struct sysdev_class *class, char *buf) |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1011 | { |
| 1012 | ssize_t count; |
| 1013 | |
| 1014 | mutex_lock(&smp_cpu_state_mutex); |
| 1015 | count = sprintf(buf, "%d\n", cpu_management); |
| 1016 | mutex_unlock(&smp_cpu_state_mutex); |
| 1017 | return count; |
| 1018 | } |
| 1019 | |
Heiko Carstens | da5aae7 | 2008-10-28 11:10:16 +0100 | [diff] [blame] | 1020 | static ssize_t dispatching_store(struct sysdev_class *dev, const char *buf, |
| 1021 | size_t count) |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1022 | { |
| 1023 | int val, rc; |
| 1024 | char delim; |
| 1025 | |
| 1026 | if (sscanf(buf, "%d %c", &val, &delim) != 1) |
| 1027 | return -EINVAL; |
| 1028 | if (val != 0 && val != 1) |
| 1029 | return -EINVAL; |
| 1030 | rc = 0; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1031 | get_online_cpus(); |
Heiko Carstens | 0b18d31 | 2008-04-30 13:38:36 +0200 | [diff] [blame] | 1032 | mutex_lock(&smp_cpu_state_mutex); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1033 | if (cpu_management == val) |
| 1034 | goto out; |
| 1035 | rc = topology_set_cpu_management(val); |
| 1036 | if (!rc) |
| 1037 | cpu_management = val; |
| 1038 | out: |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1039 | mutex_unlock(&smp_cpu_state_mutex); |
Heiko Carstens | 0b18d31 | 2008-04-30 13:38:36 +0200 | [diff] [blame] | 1040 | put_online_cpus(); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1041 | return rc ? rc : count; |
| 1042 | } |
Heiko Carstens | da5aae7 | 2008-10-28 11:10:16 +0100 | [diff] [blame] | 1043 | static SYSDEV_CLASS_ATTR(dispatching, 0644, dispatching_show, |
| 1044 | dispatching_store); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1045 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1046 | static int __init topology_init(void) |
| 1047 | { |
| 1048 | int cpu; |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 1049 | int rc; |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 1050 | |
| 1051 | register_cpu_notifier(&smp_cpu_nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1052 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1053 | #ifdef CONFIG_HOTPLUG_CPU |
Heiko Carstens | da5aae7 | 2008-10-28 11:10:16 +0100 | [diff] [blame] | 1054 | rc = sysdev_class_create_file(&cpu_sysdev_class, &attr_rescan); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1055 | if (rc) |
| 1056 | return rc; |
| 1057 | #endif |
Heiko Carstens | da5aae7 | 2008-10-28 11:10:16 +0100 | [diff] [blame] | 1058 | rc = sysdev_class_create_file(&cpu_sysdev_class, &attr_dispatching); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1059 | if (rc) |
| 1060 | return rc; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1061 | for_each_present_cpu(cpu) { |
| 1062 | rc = smp_add_present_cpu(cpu); |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 1063 | if (rc) |
| 1064 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | } |
| 1066 | return 0; |
| 1067 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | subsys_initcall(topology_init); |