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 | |
Heiko Carstens | f230886 | 2011-01-05 12:48:08 +0100 | [diff] [blame] | 26 | #include <linux/workqueue.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include <linux/module.h> |
| 28 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/mm.h> |
Alexey Dobriyan | 4e950f6 | 2007-07-30 02:36:13 +0400 | [diff] [blame] | 30 | #include <linux/err.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include <linux/spinlock.h> |
| 32 | #include <linux/kernel_stat.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 33 | #include <linux/delay.h> |
| 34 | #include <linux/cache.h> |
| 35 | #include <linux/interrupt.h> |
Christian Borntraeger | 3324e60 | 2009-03-26 15:23:56 +0100 | [diff] [blame] | 36 | #include <linux/irqflags.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | #include <linux/cpu.h> |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 38 | #include <linux/timex.h> |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 39 | #include <linux/bootmem.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 40 | #include <linux/slab.h> |
Michael Holzheu | 60a0c68 | 2011-10-30 15:16:40 +0100 | [diff] [blame] | 41 | #include <linux/crash_dump.h> |
Heiko Carstens | cbb870c | 2010-02-26 22:37:43 +0100 | [diff] [blame] | 42 | #include <asm/asm-offsets.h> |
Michael Holzheu | 46b05d2 | 2007-02-21 10:55:21 +0100 | [diff] [blame] | 43 | #include <asm/ipl.h> |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 44 | #include <asm/setup.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #include <asm/sigp.h> |
| 46 | #include <asm/pgalloc.h> |
| 47 | #include <asm/irq.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 48 | #include <asm/cpcmd.h> |
| 49 | #include <asm/tlbflush.h> |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 50 | #include <asm/timer.h> |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 51 | #include <asm/lowcore.h> |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 52 | #include <asm/sclp.h> |
Martin Schwidefsky | 76d4e00 | 2009-06-12 10:26:21 +0200 | [diff] [blame] | 53 | #include <asm/cputime.h> |
Martin Schwidefsky | c742b31 | 2008-12-31 15:11:42 +0100 | [diff] [blame] | 54 | #include <asm/vdso.h> |
Heiko Carstens | 4bb5e07 | 2009-09-11 10:29:03 +0200 | [diff] [blame] | 55 | #include <asm/cpu.h> |
Heiko Carstens | a806170 | 2008-04-17 07:46:26 +0200 | [diff] [blame] | 56 | #include "entry.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | |
Heiko Carstens | fb380aa | 2010-01-13 20:44:37 +0100 | [diff] [blame] | 58 | /* logical cpu to cpu address */ |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 59 | unsigned short __cpu_logical_map[NR_CPUS]; |
Heiko Carstens | fb380aa | 2010-01-13 20:44:37 +0100 | [diff] [blame] | 60 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | static struct task_struct *current_set[NR_CPUS]; |
| 62 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 63 | static u8 smp_cpu_type; |
| 64 | static int smp_use_sigp_detection; |
| 65 | |
| 66 | enum s390_cpu_state { |
| 67 | CPU_STATE_STANDBY, |
| 68 | CPU_STATE_CONFIGURED, |
| 69 | }; |
| 70 | |
Heiko Carstens | dbd70fb | 2008-04-17 07:46:12 +0200 | [diff] [blame] | 71 | DEFINE_MUTEX(smp_cpu_state_mutex); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 72 | int smp_cpu_polarization[NR_CPUS]; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 73 | static int smp_cpu_state[NR_CPUS]; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 74 | static int cpu_management; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 75 | |
| 76 | static DEFINE_PER_CPU(struct cpu, cpu_devices); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 77 | |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 78 | static void smp_ext_bitcall(int, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 80 | static int raw_cpu_stopped(int cpu) |
Heiko Carstens | 5c0b912 | 2009-09-11 10:29:05 +0200 | [diff] [blame] | 81 | { |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 82 | u32 status; |
Heiko Carstens | 5c0b912 | 2009-09-11 10:29:05 +0200 | [diff] [blame] | 83 | |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 84 | switch (raw_sigp_ps(&status, 0, cpu, sigp_sense)) { |
Heiko Carstens | 5c0b912 | 2009-09-11 10:29:05 +0200 | [diff] [blame] | 85 | case sigp_status_stored: |
| 86 | /* Check for stopped and check stop state */ |
| 87 | if (status & 0x50) |
| 88 | return 1; |
| 89 | break; |
| 90 | default: |
| 91 | break; |
| 92 | } |
| 93 | return 0; |
| 94 | } |
| 95 | |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 96 | static inline int cpu_stopped(int cpu) |
| 97 | { |
| 98 | return raw_cpu_stopped(cpu_logical_map(cpu)); |
| 99 | } |
| 100 | |
Michael Holzheu | 1943f53 | 2011-10-30 15:16:38 +0100 | [diff] [blame] | 101 | /* |
| 102 | * Ensure that PSW restart is done on an online CPU |
| 103 | */ |
| 104 | void smp_restart_with_online_cpu(void) |
| 105 | { |
| 106 | int cpu; |
| 107 | |
| 108 | for_each_online_cpu(cpu) { |
| 109 | if (stap() == __cpu_logical_map[cpu]) { |
| 110 | /* We are online: Enable DAT again and return */ |
Martin Schwidefsky | b50511e | 2011-10-30 15:16:50 +0100 | [diff] [blame] | 111 | __load_psw_mask(psw_kernel_bits | PSW_MASK_DAT); |
Michael Holzheu | 1943f53 | 2011-10-30 15:16:38 +0100 | [diff] [blame] | 112 | return; |
| 113 | } |
| 114 | } |
| 115 | /* We are not online: Do PSW restart on an online CPU */ |
| 116 | while (sigp(cpu, sigp_restart) == sigp_busy) |
| 117 | cpu_relax(); |
| 118 | /* And stop ourself */ |
| 119 | while (raw_sigp(stap(), sigp_stop) == sigp_busy) |
| 120 | cpu_relax(); |
| 121 | for (;;); |
| 122 | } |
| 123 | |
Heiko Carstens | 2c2df11 | 2010-02-26 22:37:34 +0100 | [diff] [blame] | 124 | void smp_switch_to_ipl_cpu(void (*func)(void *), void *data) |
| 125 | { |
| 126 | struct _lowcore *lc, *current_lc; |
| 127 | struct stack_frame *sf; |
| 128 | struct pt_regs *regs; |
| 129 | unsigned long sp; |
| 130 | |
| 131 | if (smp_processor_id() == 0) |
| 132 | func(data); |
Martin Schwidefsky | b50511e | 2011-10-30 15:16:50 +0100 | [diff] [blame] | 133 | __load_psw_mask(PSW_DEFAULT_KEY | PSW_MASK_BASE | |
| 134 | PSW_MASK_EA | PSW_MASK_BA); |
Heiko Carstens | 2c2df11 | 2010-02-26 22:37:34 +0100 | [diff] [blame] | 135 | /* Disable lowcore protection */ |
| 136 | __ctl_clear_bit(0, 28); |
| 137 | current_lc = lowcore_ptr[smp_processor_id()]; |
| 138 | lc = lowcore_ptr[0]; |
| 139 | if (!lc) |
| 140 | lc = current_lc; |
Martin Schwidefsky | b50511e | 2011-10-30 15:16:50 +0100 | [diff] [blame] | 141 | lc->restart_psw.mask = |
| 142 | PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA; |
Heiko Carstens | 2c2df11 | 2010-02-26 22:37:34 +0100 | [diff] [blame] | 143 | lc->restart_psw.addr = PSW_ADDR_AMODE | (unsigned long) smp_restart_cpu; |
| 144 | if (!cpu_online(0)) |
| 145 | smp_switch_to_cpu(func, data, 0, stap(), __cpu_logical_map[0]); |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 146 | while (sigp(0, sigp_stop_and_store_status) == sigp_busy) |
Heiko Carstens | 2c2df11 | 2010-02-26 22:37:34 +0100 | [diff] [blame] | 147 | cpu_relax(); |
| 148 | sp = lc->panic_stack; |
| 149 | sp -= sizeof(struct pt_regs); |
| 150 | regs = (struct pt_regs *) sp; |
| 151 | memcpy(®s->gprs, ¤t_lc->gpregs_save_area, sizeof(regs->gprs)); |
Heiko Carstens | cbb870c | 2010-02-26 22:37:43 +0100 | [diff] [blame] | 152 | regs->psw = lc->psw_save_area; |
Heiko Carstens | 2c2df11 | 2010-02-26 22:37:34 +0100 | [diff] [blame] | 153 | sp -= STACK_FRAME_OVERHEAD; |
| 154 | sf = (struct stack_frame *) sp; |
| 155 | sf->back_chain = regs->gprs[15]; |
| 156 | smp_switch_to_cpu(func, data, sp, stap(), __cpu_logical_map[0]); |
| 157 | } |
| 158 | |
Heiko Carstens | 677d762 | 2007-11-20 11:13:37 +0100 | [diff] [blame] | 159 | void smp_send_stop(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 161 | int cpu, rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | |
Heiko Carstens | 677d762 | 2007-11-20 11:13:37 +0100 | [diff] [blame] | 163 | /* Disable all interrupts/machine checks */ |
Martin Schwidefsky | b50511e | 2011-10-30 15:16:50 +0100 | [diff] [blame] | 164 | __load_psw_mask(psw_kernel_bits | PSW_MASK_DAT); |
Christian Borntraeger | 3324e60 | 2009-03-26 15:23:56 +0100 | [diff] [blame] | 165 | trace_hardirqs_off(); |
Heiko Carstens | 677d762 | 2007-11-20 11:13:37 +0100 | [diff] [blame] | 166 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 167 | /* stop all processors */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | for_each_online_cpu(cpu) { |
| 169 | if (cpu == smp_processor_id()) |
| 170 | continue; |
| 171 | do { |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 172 | rc = sigp(cpu, sigp_stop); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | } while (rc == sigp_busy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | |
Heiko Carstens | 5c0b912 | 2009-09-11 10:29:05 +0200 | [diff] [blame] | 175 | while (!cpu_stopped(cpu)) |
Heiko Carstens | c6b5b84 | 2006-12-04 15:40:33 +0100 | [diff] [blame] | 176 | cpu_relax(); |
| 177 | } |
| 178 | } |
| 179 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | * This is the main routine where commands issued by other |
| 182 | * cpus are handled. |
| 183 | */ |
| 184 | |
Martin Schwidefsky | f6649a7 | 2010-10-25 16:10:38 +0200 | [diff] [blame] | 185 | static void do_ext_call_interrupt(unsigned int ext_int_code, |
| 186 | unsigned int param32, unsigned long param64) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 188 | unsigned long bits; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | |
Heiko Carstens | 2a3a2d6 | 2011-10-30 15:17:19 +0100 | [diff] [blame] | 190 | if (ext_int_code == 0x1202) |
| 191 | kstat_cpu(smp_processor_id()).irqs[EXTINT_EXC]++; |
| 192 | else |
| 193 | kstat_cpu(smp_processor_id()).irqs[EXTINT_EMS]++; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 194 | /* |
| 195 | * handle bit signal external calls |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 196 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | bits = xchg(&S390_lowcore.ext_call_fast, 0); |
| 198 | |
Peter Zijlstra | 184748c | 2011-04-05 17:23:39 +0200 | [diff] [blame] | 199 | if (test_bit(ec_schedule, &bits)) |
| 200 | scheduler_ipi(); |
| 201 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 202 | if (test_bit(ec_call_function, &bits)) |
Heiko Carstens | ca9fc75 | 2008-12-25 13:38:39 +0100 | [diff] [blame] | 203 | generic_smp_call_function_interrupt(); |
| 204 | |
| 205 | if (test_bit(ec_call_function_single, &bits)) |
| 206 | generic_smp_call_function_single_interrupt(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | } |
| 208 | |
| 209 | /* |
| 210 | * Send an external call sigp to another cpu and return without waiting |
| 211 | * for its completion. |
| 212 | */ |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 213 | static void smp_ext_bitcall(int cpu, int sig) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | { |
Martin Schwidefsky | d98e19c | 2011-10-30 15:16:58 +0100 | [diff] [blame] | 215 | int order; |
| 216 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 217 | /* |
| 218 | * Set signaling bit in lowcore of target cpu and kick it |
| 219 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast); |
Martin Schwidefsky | d98e19c | 2011-10-30 15:16:58 +0100 | [diff] [blame] | 221 | while (1) { |
| 222 | order = smp_vcpu_scheduled(cpu) ? |
| 223 | sigp_external_call : sigp_emergency_signal; |
| 224 | if (sigp(cpu, order) != sigp_busy) |
| 225 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | udelay(10); |
Martin Schwidefsky | d98e19c | 2011-10-30 15:16:58 +0100 | [diff] [blame] | 227 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | } |
| 229 | |
Rusty Russell | 630cd04 | 2009-09-24 09:34:45 -0600 | [diff] [blame] | 230 | void arch_send_call_function_ipi_mask(const struct cpumask *mask) |
Heiko Carstens | ca9fc75 | 2008-12-25 13:38:39 +0100 | [diff] [blame] | 231 | { |
| 232 | int cpu; |
| 233 | |
Rusty Russell | 630cd04 | 2009-09-24 09:34:45 -0600 | [diff] [blame] | 234 | for_each_cpu(cpu, mask) |
Heiko Carstens | ca9fc75 | 2008-12-25 13:38:39 +0100 | [diff] [blame] | 235 | smp_ext_bitcall(cpu, ec_call_function); |
| 236 | } |
| 237 | |
| 238 | void arch_send_call_function_single_ipi(int cpu) |
| 239 | { |
| 240 | smp_ext_bitcall(cpu, ec_call_function_single); |
| 241 | } |
| 242 | |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 243 | #ifndef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 244 | /* |
| 245 | * this function sends a 'purge tlb' signal to another CPU. |
| 246 | */ |
Heiko Carstens | a806170 | 2008-04-17 07:46:26 +0200 | [diff] [blame] | 247 | static void smp_ptlb_callback(void *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | { |
Martin Schwidefsky | ba8a922 | 2007-10-22 12:52:44 +0200 | [diff] [blame] | 249 | __tlb_flush_local(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | } |
| 251 | |
| 252 | void smp_ptlb_all(void) |
| 253 | { |
Jens Axboe | 15c8b6c | 2008-05-09 09:39:44 +0200 | [diff] [blame] | 254 | on_each_cpu(smp_ptlb_callback, NULL, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | } |
| 256 | EXPORT_SYMBOL(smp_ptlb_all); |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 257 | #endif /* ! CONFIG_64BIT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | |
| 259 | /* |
| 260 | * this function sends a 'reschedule' IPI to another CPU. |
| 261 | * it goes straight through and wastes no time serializing |
| 262 | * anything. Worst case is that we lose a reschedule ... |
| 263 | */ |
| 264 | void smp_send_reschedule(int cpu) |
| 265 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 266 | smp_ext_bitcall(cpu, ec_schedule); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | } |
| 268 | |
| 269 | /* |
| 270 | * parameter area for the set/clear control bit callbacks |
| 271 | */ |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 272 | struct ec_creg_mask_parms { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | unsigned long orvals[16]; |
| 274 | unsigned long andvals[16]; |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 275 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | |
| 277 | /* |
| 278 | * callback for setting/clearing control bits |
| 279 | */ |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 280 | static void smp_ctl_bit_callback(void *info) |
| 281 | { |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 282 | struct ec_creg_mask_parms *pp = info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | unsigned long cregs[16]; |
| 284 | int i; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 285 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 286 | __ctl_store(cregs, 0, 15); |
| 287 | for (i = 0; i <= 15; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | cregs[i] = (cregs[i] & pp->andvals[i]) | pp->orvals[i]; |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 289 | __ctl_load(cregs, 0, 15); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 290 | } |
| 291 | |
| 292 | /* |
| 293 | * Set a bit in a control register of all cpus |
| 294 | */ |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 295 | void smp_ctl_set_bit(int cr, int bit) |
| 296 | { |
| 297 | struct ec_creg_mask_parms parms; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 299 | memset(&parms.orvals, 0, sizeof(parms.orvals)); |
| 300 | memset(&parms.andvals, 0xff, sizeof(parms.andvals)); |
Jan Glauber | 859c965 | 2011-06-22 16:24:10 +0200 | [diff] [blame] | 301 | parms.orvals[cr] = 1UL << bit; |
Jens Axboe | 15c8b6c | 2008-05-09 09:39:44 +0200 | [diff] [blame] | 302 | on_each_cpu(smp_ctl_bit_callback, &parms, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | } |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 304 | EXPORT_SYMBOL(smp_ctl_set_bit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | |
| 306 | /* |
| 307 | * Clear a bit in a control register of all cpus |
| 308 | */ |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 309 | void smp_ctl_clear_bit(int cr, int bit) |
| 310 | { |
| 311 | struct ec_creg_mask_parms parms; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 313 | memset(&parms.orvals, 0, sizeof(parms.orvals)); |
| 314 | memset(&parms.andvals, 0xff, sizeof(parms.andvals)); |
Jan Glauber | 859c965 | 2011-06-22 16:24:10 +0200 | [diff] [blame] | 315 | parms.andvals[cr] = ~(1UL << bit); |
Jens Axboe | 15c8b6c | 2008-05-09 09:39:44 +0200 | [diff] [blame] | 316 | on_each_cpu(smp_ctl_bit_callback, &parms, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | } |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 318 | EXPORT_SYMBOL(smp_ctl_clear_bit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 319 | |
Michael Holzheu | 60a0c68 | 2011-10-30 15:16:40 +0100 | [diff] [blame] | 320 | #if defined(CONFIG_ZFCPDUMP) || defined(CONFIG_CRASH_DUMP) |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 321 | |
Heiko Carstens | 285f672 | 2007-07-10 11:24:13 +0200 | [diff] [blame] | 322 | 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] | 323 | { |
Michael Holzheu | 60a0c68 | 2011-10-30 15:16:40 +0100 | [diff] [blame] | 324 | if (ipl_info.type != IPL_TYPE_FCP_DUMP && !OLDMEM_BASE) |
| 325 | return; |
| 326 | if (is_kdump_kernel()) |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 327 | return; |
Heiko Carstens | 285f672 | 2007-07-10 11:24:13 +0200 | [diff] [blame] | 328 | if (cpu >= NR_CPUS) { |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 329 | pr_warning("CPU %i exceeds the maximum %i and is excluded from " |
| 330 | "the dump\n", cpu, NR_CPUS - 1); |
Heiko Carstens | 285f672 | 2007-07-10 11:24:13 +0200 | [diff] [blame] | 331 | return; |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 332 | } |
Heiko Carstens | f64ca21 | 2010-02-26 22:37:32 +0100 | [diff] [blame] | 333 | zfcpdump_save_areas[cpu] = kmalloc(sizeof(struct save_area), GFP_KERNEL); |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 334 | while (raw_sigp(phy_cpu, sigp_stop_and_store_status) == sigp_busy) |
Heiko Carstens | 285f672 | 2007-07-10 11:24:13 +0200 | [diff] [blame] | 335 | cpu_relax(); |
Michael Holzheu | 92fe313 | 2010-03-24 11:49:50 +0100 | [diff] [blame] | 336 | memcpy_real(zfcpdump_save_areas[cpu], |
| 337 | (void *)(unsigned long) store_prefix() + SAVE_AREA_BASE, |
| 338 | sizeof(struct save_area)); |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 339 | } |
| 340 | |
Heiko Carstens | f64ca21 | 2010-02-26 22:37:32 +0100 | [diff] [blame] | 341 | struct save_area *zfcpdump_save_areas[NR_CPUS + 1]; |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 342 | EXPORT_SYMBOL_GPL(zfcpdump_save_areas); |
| 343 | |
| 344 | #else |
Heiko Carstens | 285f672 | 2007-07-10 11:24:13 +0200 | [diff] [blame] | 345 | |
| 346 | static inline void smp_get_save_area(unsigned int cpu, unsigned int phy_cpu) { } |
| 347 | |
Michael Holzheu | 59f2e69 | 2009-03-26 15:24:46 +0100 | [diff] [blame] | 348 | #endif /* CONFIG_ZFCPDUMP */ |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 349 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 350 | static int cpu_known(int cpu_id) |
| 351 | { |
| 352 | int cpu; |
| 353 | |
| 354 | for_each_present_cpu(cpu) { |
| 355 | if (__cpu_logical_map[cpu] == cpu_id) |
| 356 | return 1; |
| 357 | } |
| 358 | return 0; |
| 359 | } |
| 360 | |
| 361 | static int smp_rescan_cpus_sigp(cpumask_t avail) |
| 362 | { |
| 363 | int cpu_id, logical_cpu; |
| 364 | |
Rusty Russell | 93632d1 | 2009-03-26 15:24:59 +0100 | [diff] [blame] | 365 | logical_cpu = cpumask_first(&avail); |
| 366 | if (logical_cpu >= nr_cpu_ids) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 367 | return 0; |
Heiko Carstens | 4bb5e07 | 2009-09-11 10:29:03 +0200 | [diff] [blame] | 368 | for (cpu_id = 0; cpu_id <= MAX_CPU_ADDRESS; cpu_id++) { |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 369 | if (cpu_known(cpu_id)) |
| 370 | continue; |
| 371 | __cpu_logical_map[logical_cpu] = cpu_id; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 372 | smp_cpu_polarization[logical_cpu] = POLARIZATION_UNKNWN; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 373 | if (!cpu_stopped(logical_cpu)) |
| 374 | continue; |
KOSAKI Motohiro | 0f1959f | 2011-05-23 10:24:36 +0200 | [diff] [blame] | 375 | set_cpu_present(logical_cpu, true); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 376 | smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED; |
Rusty Russell | 93632d1 | 2009-03-26 15:24:59 +0100 | [diff] [blame] | 377 | logical_cpu = cpumask_next(logical_cpu, &avail); |
| 378 | if (logical_cpu >= nr_cpu_ids) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 379 | break; |
| 380 | } |
| 381 | return 0; |
| 382 | } |
| 383 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 384 | static int smp_rescan_cpus_sclp(cpumask_t avail) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 385 | { |
| 386 | struct sclp_cpu_info *info; |
| 387 | int cpu_id, logical_cpu, cpu; |
| 388 | int rc; |
| 389 | |
Rusty Russell | 93632d1 | 2009-03-26 15:24:59 +0100 | [diff] [blame] | 390 | logical_cpu = cpumask_first(&avail); |
| 391 | if (logical_cpu >= nr_cpu_ids) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 392 | return 0; |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 393 | info = kmalloc(sizeof(*info), GFP_KERNEL); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 394 | if (!info) |
| 395 | return -ENOMEM; |
| 396 | rc = sclp_get_cpu_info(info); |
| 397 | if (rc) |
| 398 | goto out; |
| 399 | for (cpu = 0; cpu < info->combined; cpu++) { |
| 400 | if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type) |
| 401 | continue; |
| 402 | cpu_id = info->cpu[cpu].address; |
| 403 | if (cpu_known(cpu_id)) |
| 404 | continue; |
| 405 | __cpu_logical_map[logical_cpu] = cpu_id; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 406 | smp_cpu_polarization[logical_cpu] = POLARIZATION_UNKNWN; |
KOSAKI Motohiro | 0f1959f | 2011-05-23 10:24:36 +0200 | [diff] [blame] | 407 | set_cpu_present(logical_cpu, true); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 408 | if (cpu >= info->configured) |
| 409 | smp_cpu_state[logical_cpu] = CPU_STATE_STANDBY; |
| 410 | else |
| 411 | smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED; |
Rusty Russell | 93632d1 | 2009-03-26 15:24:59 +0100 | [diff] [blame] | 412 | logical_cpu = cpumask_next(logical_cpu, &avail); |
| 413 | if (logical_cpu >= nr_cpu_ids) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 414 | break; |
| 415 | } |
| 416 | out: |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 417 | kfree(info); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 418 | return rc; |
| 419 | } |
| 420 | |
Heiko Carstens | 1e48951 | 2008-04-30 13:38:37 +0200 | [diff] [blame] | 421 | static int __smp_rescan_cpus(void) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 422 | { |
| 423 | cpumask_t avail; |
| 424 | |
KOSAKI Motohiro | 0f1959f | 2011-05-23 10:24:36 +0200 | [diff] [blame] | 425 | cpumask_xor(&avail, cpu_possible_mask, cpu_present_mask); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 426 | if (smp_use_sigp_detection) |
| 427 | return smp_rescan_cpus_sigp(avail); |
| 428 | else |
| 429 | return smp_rescan_cpus_sclp(avail); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | } |
| 431 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 432 | static void __init smp_detect_cpus(void) |
| 433 | { |
| 434 | unsigned int cpu, c_cpus, s_cpus; |
| 435 | struct sclp_cpu_info *info; |
| 436 | u16 boot_cpu_addr, cpu_addr; |
| 437 | |
| 438 | c_cpus = 1; |
| 439 | s_cpus = 0; |
Martin Schwidefsky | 7b46848 | 2009-03-26 15:24:42 +0100 | [diff] [blame] | 440 | boot_cpu_addr = __cpu_logical_map[0]; |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 441 | info = kmalloc(sizeof(*info), GFP_KERNEL); |
| 442 | if (!info) |
| 443 | panic("smp_detect_cpus failed to allocate memory\n"); |
Michael Holzheu | 60a0c68 | 2011-10-30 15:16:40 +0100 | [diff] [blame] | 444 | #ifdef CONFIG_CRASH_DUMP |
| 445 | if (OLDMEM_BASE && !is_kdump_kernel()) { |
| 446 | struct save_area *save_area; |
| 447 | |
| 448 | save_area = kmalloc(sizeof(*save_area), GFP_KERNEL); |
| 449 | if (!save_area) |
| 450 | panic("could not allocate memory for save area\n"); |
| 451 | copy_oldmem_page(1, (void *) save_area, sizeof(*save_area), |
| 452 | 0x200, 0); |
| 453 | zfcpdump_save_areas[0] = save_area; |
| 454 | } |
| 455 | #endif |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 456 | /* Use sigp detection algorithm if sclp doesn't work. */ |
| 457 | if (sclp_get_cpu_info(info)) { |
| 458 | smp_use_sigp_detection = 1; |
Heiko Carstens | 4bb5e07 | 2009-09-11 10:29:03 +0200 | [diff] [blame] | 459 | for (cpu = 0; cpu <= MAX_CPU_ADDRESS; cpu++) { |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 460 | if (cpu == boot_cpu_addr) |
| 461 | continue; |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 462 | if (!raw_cpu_stopped(cpu)) |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 463 | continue; |
| 464 | smp_get_save_area(c_cpus, cpu); |
| 465 | c_cpus++; |
| 466 | } |
| 467 | goto out; |
| 468 | } |
| 469 | |
| 470 | if (info->has_cpu_type) { |
| 471 | for (cpu = 0; cpu < info->combined; cpu++) { |
| 472 | if (info->cpu[cpu].address == boot_cpu_addr) { |
| 473 | smp_cpu_type = info->cpu[cpu].type; |
| 474 | break; |
| 475 | } |
| 476 | } |
| 477 | } |
| 478 | |
| 479 | for (cpu = 0; cpu < info->combined; cpu++) { |
| 480 | if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type) |
| 481 | continue; |
| 482 | cpu_addr = info->cpu[cpu].address; |
| 483 | if (cpu_addr == boot_cpu_addr) |
| 484 | continue; |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 485 | if (!raw_cpu_stopped(cpu_addr)) { |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 486 | s_cpus++; |
| 487 | continue; |
| 488 | } |
| 489 | smp_get_save_area(c_cpus, cpu_addr); |
| 490 | c_cpus++; |
| 491 | } |
| 492 | out: |
| 493 | kfree(info); |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 494 | 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] | 495 | get_online_cpus(); |
Heiko Carstens | 1e48951 | 2008-04-30 13:38:37 +0200 | [diff] [blame] | 496 | __smp_rescan_cpus(); |
Martin Schwidefsky | 9d40d2e | 2008-01-26 14:11:31 +0100 | [diff] [blame] | 497 | put_online_cpus(); |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 498 | } |
| 499 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 500 | /* |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 501 | * Activate a secondary processor. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 502 | */ |
Heiko Carstens | ea1f4ee | 2007-05-31 17:38:05 +0200 | [diff] [blame] | 503 | int __cpuinit start_secondary(void *cpuvoid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 505 | cpu_init(); |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 506 | preempt_disable(); |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 507 | init_cpu_timer(); |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 508 | init_cpu_vtimer(); |
Heiko Carstens | 29b08d2 | 2006-12-04 15:40:40 +0100 | [diff] [blame] | 509 | pfault_init(); |
| 510 | |
Manfred Spraul | e545a61 | 2008-09-07 16:57:22 +0200 | [diff] [blame] | 511 | notify_cpu_starting(smp_processor_id()); |
Heiko Carstens | ca9fc75 | 2008-12-25 13:38:39 +0100 | [diff] [blame] | 512 | ipi_call_lock(); |
KOSAKI Motohiro | 0f1959f | 2011-05-23 10:24:36 +0200 | [diff] [blame] | 513 | set_cpu_online(smp_processor_id(), true); |
Heiko Carstens | ca9fc75 | 2008-12-25 13:38:39 +0100 | [diff] [blame] | 514 | ipi_call_unlock(); |
Michael Holzheu | 7dd6b33 | 2011-08-03 16:44:19 +0200 | [diff] [blame] | 515 | __ctl_clear_bit(0, 28); /* Disable lowcore protection */ |
Martin Schwidefsky | b50511e | 2011-10-30 15:16:50 +0100 | [diff] [blame] | 516 | S390_lowcore.restart_psw.mask = |
| 517 | PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA; |
Michael Holzheu | 7dd6b33 | 2011-08-03 16:44:19 +0200 | [diff] [blame] | 518 | S390_lowcore.restart_psw.addr = |
| 519 | PSW_ADDR_AMODE | (unsigned long) psw_restart_int_handler; |
| 520 | __ctl_set_bit(0, 28); /* Enable lowcore protection */ |
Heiko Carstens | cc34321 | 2011-08-03 16:44:27 +0200 | [diff] [blame] | 521 | /* |
| 522 | * Wait until the cpu which brought this one up marked it |
| 523 | * active before enabling interrupts. |
| 524 | */ |
| 525 | while (!cpumask_test_cpu(smp_processor_id(), cpu_active_mask)) |
| 526 | cpu_relax(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | local_irq_enable(); |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 528 | /* cpu_idle will call schedule for us */ |
| 529 | cpu_idle(); |
| 530 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | } |
| 532 | |
Heiko Carstens | f230886 | 2011-01-05 12:48:08 +0100 | [diff] [blame] | 533 | struct create_idle { |
| 534 | struct work_struct work; |
| 535 | struct task_struct *idle; |
| 536 | struct completion done; |
| 537 | int cpu; |
| 538 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | |
Heiko Carstens | f230886 | 2011-01-05 12:48:08 +0100 | [diff] [blame] | 540 | static void __cpuinit smp_fork_idle(struct work_struct *work) |
| 541 | { |
| 542 | struct create_idle *c_idle; |
| 543 | |
| 544 | c_idle = container_of(work, struct create_idle, work); |
| 545 | c_idle->idle = fork_idle(c_idle->cpu); |
| 546 | complete(&c_idle->done); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | } |
| 548 | |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 549 | static int __cpuinit smp_alloc_lowcore(int cpu) |
| 550 | { |
| 551 | unsigned long async_stack, panic_stack; |
| 552 | struct _lowcore *lowcore; |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 553 | |
Heiko Carstens | 3fd26a7 | 2009-09-22 22:58:49 +0200 | [diff] [blame] | 554 | lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, LC_ORDER); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 555 | if (!lowcore) |
| 556 | return -ENOMEM; |
| 557 | async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 558 | panic_stack = __get_free_page(GFP_KERNEL); |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 559 | if (!panic_stack || !async_stack) |
| 560 | goto out; |
Heiko Carstens | 98c7b38 | 2008-03-05 12:37:09 +0100 | [diff] [blame] | 561 | memcpy(lowcore, &S390_lowcore, 512); |
| 562 | memset((char *)lowcore + 512, 0, sizeof(*lowcore) - 512); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 563 | lowcore->async_stack = async_stack + ASYNC_SIZE; |
| 564 | lowcore->panic_stack = panic_stack + PAGE_SIZE; |
Martin Schwidefsky | b50511e | 2011-10-30 15:16:50 +0100 | [diff] [blame] | 565 | lowcore->restart_psw.mask = |
| 566 | PSW_DEFAULT_KEY | PSW_MASK_BASE | PSW_MASK_EA | PSW_MASK_BA; |
Michael Holzheu | 7dd6b33 | 2011-08-03 16:44:19 +0200 | [diff] [blame] | 567 | lowcore->restart_psw.addr = |
| 568 | PSW_ADDR_AMODE | (unsigned long) restart_int_handler; |
| 569 | if (user_mode != HOME_SPACE_MODE) |
| 570 | lowcore->restart_psw.mask |= PSW_ASC_HOME; |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 571 | #ifndef CONFIG_64BIT |
| 572 | if (MACHINE_HAS_IEEE) { |
| 573 | unsigned long save_area; |
| 574 | |
| 575 | save_area = get_zeroed_page(GFP_KERNEL); |
| 576 | if (!save_area) |
Martin Schwidefsky | 33b1d09 | 2008-12-25 13:39:27 +0100 | [diff] [blame] | 577 | goto out; |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 578 | lowcore->extended_save_area_addr = (u32) save_area; |
| 579 | } |
Martin Schwidefsky | c742b31 | 2008-12-31 15:11:42 +0100 | [diff] [blame] | 580 | #else |
| 581 | if (vdso_alloc_per_cpu(cpu, lowcore)) |
| 582 | goto out; |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 583 | #endif |
| 584 | lowcore_ptr[cpu] = lowcore; |
| 585 | return 0; |
| 586 | |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 587 | out: |
Martin Schwidefsky | 33b1d09 | 2008-12-25 13:39:27 +0100 | [diff] [blame] | 588 | free_page(panic_stack); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 589 | free_pages(async_stack, ASYNC_ORDER); |
Heiko Carstens | 3fd26a7 | 2009-09-22 22:58:49 +0200 | [diff] [blame] | 590 | free_pages((unsigned long) lowcore, LC_ORDER); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 591 | return -ENOMEM; |
| 592 | } |
| 593 | |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 594 | static void smp_free_lowcore(int cpu) |
| 595 | { |
| 596 | struct _lowcore *lowcore; |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 597 | |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 598 | lowcore = lowcore_ptr[cpu]; |
| 599 | #ifndef CONFIG_64BIT |
| 600 | if (MACHINE_HAS_IEEE) |
| 601 | free_page((unsigned long) lowcore->extended_save_area_addr); |
Martin Schwidefsky | c742b31 | 2008-12-31 15:11:42 +0100 | [diff] [blame] | 602 | #else |
| 603 | vdso_free_per_cpu(cpu, lowcore); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 604 | #endif |
| 605 | free_page(lowcore->panic_stack - PAGE_SIZE); |
| 606 | free_pages(lowcore->async_stack - ASYNC_SIZE, ASYNC_ORDER); |
Heiko Carstens | 3fd26a7 | 2009-09-22 22:58:49 +0200 | [diff] [blame] | 607 | free_pages((unsigned long) lowcore, LC_ORDER); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 608 | lowcore_ptr[cpu] = NULL; |
| 609 | } |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 610 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | /* Upping and downing of CPUs */ |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 612 | int __cpuinit __cpu_up(unsigned int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 613 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 614 | struct _lowcore *cpu_lowcore; |
Heiko Carstens | f230886 | 2011-01-05 12:48:08 +0100 | [diff] [blame] | 615 | struct create_idle c_idle; |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 616 | struct task_struct *idle; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 617 | struct stack_frame *sf; |
Heiko Carstens | d0d3cdf | 2009-03-26 15:24:53 +0100 | [diff] [blame] | 618 | u32 lowcore; |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 619 | int ccode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 620 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 621 | if (smp_cpu_state[cpu] != CPU_STATE_CONFIGURED) |
| 622 | return -EIO; |
Heiko Carstens | f230886 | 2011-01-05 12:48:08 +0100 | [diff] [blame] | 623 | idle = current_set[cpu]; |
| 624 | if (!idle) { |
| 625 | c_idle.done = COMPLETION_INITIALIZER_ONSTACK(c_idle.done); |
| 626 | INIT_WORK_ONSTACK(&c_idle.work, smp_fork_idle); |
| 627 | c_idle.cpu = cpu; |
| 628 | schedule_work(&c_idle.work); |
| 629 | wait_for_completion(&c_idle.done); |
| 630 | if (IS_ERR(c_idle.idle)) |
| 631 | return PTR_ERR(c_idle.idle); |
| 632 | idle = c_idle.idle; |
| 633 | current_set[cpu] = c_idle.idle; |
| 634 | } |
Heiko Carstens | da7f51c | 2011-01-05 12:48:09 +0100 | [diff] [blame] | 635 | init_idle(idle, cpu); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 636 | if (smp_alloc_lowcore(cpu)) |
| 637 | return -ENOMEM; |
Heiko Carstens | d0d3cdf | 2009-03-26 15:24:53 +0100 | [diff] [blame] | 638 | do { |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 639 | ccode = sigp(cpu, sigp_initial_cpu_reset); |
Heiko Carstens | d0d3cdf | 2009-03-26 15:24:53 +0100 | [diff] [blame] | 640 | if (ccode == sigp_busy) |
| 641 | udelay(10); |
| 642 | if (ccode == sigp_not_operational) |
| 643 | goto err_out; |
| 644 | } while (ccode == sigp_busy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | |
Heiko Carstens | d0d3cdf | 2009-03-26 15:24:53 +0100 | [diff] [blame] | 646 | lowcore = (u32)(unsigned long)lowcore_ptr[cpu]; |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 647 | while (sigp_p(lowcore, cpu, sigp_set_prefix) == sigp_busy) |
Heiko Carstens | d0d3cdf | 2009-03-26 15:24:53 +0100 | [diff] [blame] | 648 | udelay(10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 650 | cpu_lowcore = lowcore_ptr[cpu]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | cpu_lowcore->kernel_stack = (unsigned long) |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 652 | task_stack_page(idle) + THREAD_SIZE; |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 653 | cpu_lowcore->thread_info = (unsigned long) task_thread_info(idle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | sf = (struct stack_frame *) (cpu_lowcore->kernel_stack |
| 655 | - sizeof(struct pt_regs) |
| 656 | - sizeof(struct stack_frame)); |
| 657 | memset(sf, 0, sizeof(struct stack_frame)); |
| 658 | sf->gprs[9] = (unsigned long) sf; |
| 659 | cpu_lowcore->save_area[15] = (unsigned long) sf; |
Segher Boessenkool | 24d3e21 | 2008-06-10 10:03:23 +0200 | [diff] [blame] | 660 | __ctl_store(cpu_lowcore->cregs_save_area, 0, 15); |
Martin Schwidefsky | 050eef3 | 2010-08-24 09:26:21 +0200 | [diff] [blame] | 661 | atomic_inc(&init_mm.context.attach_count); |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 662 | asm volatile( |
| 663 | " stam 0,15,0(%0)" |
| 664 | : : "a" (&cpu_lowcore->access_regs_save_area) : "memory"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 665 | cpu_lowcore->percpu_offset = __per_cpu_offset[cpu]; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 666 | cpu_lowcore->current_task = (unsigned long) idle; |
Martin Schwidefsky | 7b46848 | 2009-03-26 15:24:42 +0100 | [diff] [blame] | 667 | cpu_lowcore->cpu_nr = cpu; |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 668 | cpu_lowcore->kernel_asce = S390_lowcore.kernel_asce; |
Christian Ehrhardt | 25097bf | 2009-04-14 15:36:16 +0200 | [diff] [blame] | 669 | cpu_lowcore->machine_flags = S390_lowcore.machine_flags; |
Heiko Carstens | dfd9f7a | 2009-06-12 10:26:44 +0200 | [diff] [blame] | 670 | cpu_lowcore->ftrace_func = S390_lowcore.ftrace_func; |
Martin Schwidefsky | 14375bc | 2010-10-25 16:10:51 +0200 | [diff] [blame] | 671 | memcpy(cpu_lowcore->stfle_fac_list, S390_lowcore.stfle_fac_list, |
| 672 | MAX_FACILITY_BIT/8); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | eieio(); |
Michael Ryan | 699ff13 | 2006-03-24 03:15:17 -0800 | [diff] [blame] | 674 | |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 675 | while (sigp(cpu, sigp_restart) == sigp_busy) |
Michael Ryan | 699ff13 | 2006-03-24 03:15:17 -0800 | [diff] [blame] | 676 | udelay(10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | |
| 678 | while (!cpu_online(cpu)) |
| 679 | cpu_relax(); |
| 680 | return 0; |
Heiko Carstens | d0d3cdf | 2009-03-26 15:24:53 +0100 | [diff] [blame] | 681 | |
| 682 | err_out: |
| 683 | smp_free_lowcore(cpu); |
| 684 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | } |
| 686 | |
Heiko Carstens | 37a3302 | 2006-02-17 13:52:47 -0800 | [diff] [blame] | 687 | static int __init setup_possible_cpus(char *s) |
| 688 | { |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 689 | int pcpus, cpu; |
| 690 | |
| 691 | pcpus = simple_strtoul(s, NULL, 0); |
Heiko Carstens | 88e0128 | 2009-04-14 15:36:25 +0200 | [diff] [blame] | 692 | init_cpu_possible(cpumask_of(0)); |
| 693 | for (cpu = 1; cpu < pcpus && cpu < nr_cpu_ids; cpu++) |
Rusty Russell | def6cfb | 2009-03-26 15:25:00 +0100 | [diff] [blame] | 694 | set_cpu_possible(cpu, true); |
Heiko Carstens | 37a3302 | 2006-02-17 13:52:47 -0800 | [diff] [blame] | 695 | return 0; |
| 696 | } |
| 697 | early_param("possible_cpus", setup_possible_cpus); |
| 698 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 699 | #ifdef CONFIG_HOTPLUG_CPU |
| 700 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 701 | int __cpu_disable(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | { |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 703 | struct ec_creg_mask_parms cr_parms; |
Zwane Mwaikambo | f370513 | 2005-06-25 14:54:50 -0700 | [diff] [blame] | 704 | int cpu = smp_processor_id(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | |
KOSAKI Motohiro | 0f1959f | 2011-05-23 10:24:36 +0200 | [diff] [blame] | 706 | set_cpu_online(cpu, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 707 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 708 | /* Disable pfault pseudo page faults on this cpu. */ |
Heiko Carstens | 29b08d2 | 2006-12-04 15:40:40 +0100 | [diff] [blame] | 709 | pfault_fini(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 711 | memset(&cr_parms.orvals, 0, sizeof(cr_parms.orvals)); |
| 712 | memset(&cr_parms.andvals, 0xff, sizeof(cr_parms.andvals)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 714 | /* disable all external interrupts */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 715 | cr_parms.orvals[0] = 0; |
Heiko Carstens | 5bd4187 | 2011-05-23 10:24:50 +0200 | [diff] [blame] | 716 | cr_parms.andvals[0] = ~(1 << 15 | 1 << 14 | 1 << 13 | 1 << 11 | |
Jan Glauber | cadfce7 | 2011-07-24 10:48:30 +0200 | [diff] [blame] | 717 | 1 << 10 | 1 << 9 | 1 << 6 | 1 << 5 | |
| 718 | 1 << 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | /* disable all I/O interrupts */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 720 | cr_parms.orvals[6] = 0; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 721 | cr_parms.andvals[6] = ~(1 << 31 | 1 << 30 | 1 << 29 | 1 << 28 | |
| 722 | 1 << 27 | 1 << 26 | 1 << 25 | 1 << 24); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | /* disable most machine checks */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | cr_parms.orvals[14] = 0; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 725 | cr_parms.andvals[14] = ~(1 << 28 | 1 << 27 | 1 << 26 | |
| 726 | 1 << 25 | 1 << 24); |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 727 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | smp_ctl_bit_callback(&cr_parms); |
| 729 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | return 0; |
| 731 | } |
| 732 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 733 | void __cpu_die(unsigned int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | { |
| 735 | /* Wait until target cpu is down */ |
Heiko Carstens | 5c0b912 | 2009-09-11 10:29:05 +0200 | [diff] [blame] | 736 | while (!cpu_stopped(cpu)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | cpu_relax(); |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 738 | while (sigp_p(0, cpu, sigp_set_prefix) == sigp_busy) |
Heiko Carstens | 4f8048e | 2009-10-29 15:04:09 +0100 | [diff] [blame] | 739 | udelay(10); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 740 | smp_free_lowcore(cpu); |
Martin Schwidefsky | 050eef3 | 2010-08-24 09:26:21 +0200 | [diff] [blame] | 741 | atomic_dec(&init_mm.context.attach_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 742 | } |
| 743 | |
Heiko Carstens | b456d94 | 2011-05-23 10:24:33 +0200 | [diff] [blame] | 744 | void __noreturn cpu_die(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | { |
| 746 | idle_task_exit(); |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 747 | while (sigp(smp_processor_id(), sigp_stop) == sigp_busy) |
Heiko Carstens | f8501ba | 2009-10-29 15:04:13 +0100 | [diff] [blame] | 748 | cpu_relax(); |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 749 | for (;;); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 750 | } |
| 751 | |
Heiko Carstens | 255acee | 2006-02-17 13:52:46 -0800 | [diff] [blame] | 752 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 753 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | void __init smp_prepare_cpus(unsigned int max_cpus) |
| 755 | { |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 756 | #ifndef CONFIG_64BIT |
| 757 | unsigned long save_area = 0; |
| 758 | #endif |
| 759 | unsigned long async_stack, panic_stack; |
| 760 | struct _lowcore *lowcore; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 761 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 762 | smp_detect_cpus(); |
| 763 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 764 | /* request the 0x1201 emergency signal external interrupt */ |
| 765 | if (register_external_interrupt(0x1201, do_ext_call_interrupt) != 0) |
| 766 | panic("Couldn't request external interrupt 0x1201"); |
Martin Schwidefsky | d98e19c | 2011-10-30 15:16:58 +0100 | [diff] [blame] | 767 | /* request the 0x1202 external call external interrupt */ |
| 768 | if (register_external_interrupt(0x1202, do_ext_call_interrupt) != 0) |
| 769 | panic("Couldn't request external interrupt 0x1202"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 771 | /* Reallocate current lowcore, but keep its contents. */ |
Heiko Carstens | 3fd26a7 | 2009-09-22 22:58:49 +0200 | [diff] [blame] | 772 | lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, LC_ORDER); |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 773 | panic_stack = __get_free_page(GFP_KERNEL); |
| 774 | async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER); |
Martin Schwidefsky | c742b31 | 2008-12-31 15:11:42 +0100 | [diff] [blame] | 775 | BUG_ON(!lowcore || !panic_stack || !async_stack); |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 776 | #ifndef CONFIG_64BIT |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 777 | if (MACHINE_HAS_IEEE) |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 778 | save_area = get_zeroed_page(GFP_KERNEL); |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 779 | #endif |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 780 | local_irq_disable(); |
| 781 | local_mcck_disable(); |
| 782 | lowcore_ptr[smp_processor_id()] = lowcore; |
| 783 | *lowcore = S390_lowcore; |
| 784 | lowcore->panic_stack = panic_stack + PAGE_SIZE; |
| 785 | lowcore->async_stack = async_stack + ASYNC_SIZE; |
| 786 | #ifndef CONFIG_64BIT |
| 787 | if (MACHINE_HAS_IEEE) |
| 788 | lowcore->extended_save_area_addr = (u32) save_area; |
| 789 | #endif |
| 790 | set_prefix((u32)(unsigned long) lowcore); |
| 791 | local_mcck_enable(); |
| 792 | local_irq_enable(); |
Heiko Carstens | 3a6ba46 | 2009-07-24 12:39:51 +0200 | [diff] [blame] | 793 | #ifdef CONFIG_64BIT |
| 794 | if (vdso_alloc_per_cpu(smp_processor_id(), &S390_lowcore)) |
| 795 | BUG(); |
| 796 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 797 | } |
| 798 | |
Heiko Carstens | ea1f4ee | 2007-05-31 17:38:05 +0200 | [diff] [blame] | 799 | void __init smp_prepare_boot_cpu(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 800 | { |
| 801 | BUG_ON(smp_processor_id() != 0); |
| 802 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 803 | current_thread_info()->cpu = 0; |
KOSAKI Motohiro | 0f1959f | 2011-05-23 10:24:36 +0200 | [diff] [blame] | 804 | set_cpu_present(0, true); |
| 805 | set_cpu_online(0, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | S390_lowcore.percpu_offset = __per_cpu_offset[0]; |
| 807 | current_set[0] = current; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 808 | smp_cpu_state[0] = CPU_STATE_CONFIGURED; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 809 | smp_cpu_polarization[0] = POLARIZATION_UNKNWN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 810 | } |
| 811 | |
Heiko Carstens | ea1f4ee | 2007-05-31 17:38:05 +0200 | [diff] [blame] | 812 | void __init smp_cpus_done(unsigned int max_cpus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | } |
| 815 | |
Heiko Carstens | 02beacc | 2010-01-13 20:44:34 +0100 | [diff] [blame] | 816 | void __init smp_setup_processor_id(void) |
| 817 | { |
| 818 | S390_lowcore.cpu_nr = 0; |
| 819 | __cpu_logical_map[0] = stap(); |
| 820 | } |
| 821 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | /* |
| 823 | * the frequency of the profiling timer can be changed |
| 824 | * by writing a multiplier value into /proc/profile. |
| 825 | * |
| 826 | * usually you want to run this on all CPUs ;) |
| 827 | */ |
| 828 | int setup_profiling_timer(unsigned int multiplier) |
| 829 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 830 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | } |
| 832 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 833 | #ifdef CONFIG_HOTPLUG_CPU |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 834 | static ssize_t cpu_configure_show(struct sys_device *dev, |
| 835 | struct sysdev_attribute *attr, char *buf) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 836 | { |
| 837 | ssize_t count; |
| 838 | |
| 839 | mutex_lock(&smp_cpu_state_mutex); |
| 840 | count = sprintf(buf, "%d\n", smp_cpu_state[dev->id]); |
| 841 | mutex_unlock(&smp_cpu_state_mutex); |
| 842 | return count; |
| 843 | } |
| 844 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 845 | static ssize_t cpu_configure_store(struct sys_device *dev, |
| 846 | struct sysdev_attribute *attr, |
| 847 | const char *buf, size_t count) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 848 | { |
| 849 | int cpu = dev->id; |
| 850 | int val, rc; |
| 851 | char delim; |
| 852 | |
| 853 | if (sscanf(buf, "%d %c", &val, &delim) != 1) |
| 854 | return -EINVAL; |
| 855 | if (val != 0 && val != 1) |
| 856 | return -EINVAL; |
| 857 | |
Martin Schwidefsky | 9d40d2e | 2008-01-26 14:11:31 +0100 | [diff] [blame] | 858 | get_online_cpus(); |
Heiko Carstens | 0b18d31 | 2008-04-30 13:38:36 +0200 | [diff] [blame] | 859 | mutex_lock(&smp_cpu_state_mutex); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 860 | rc = -EBUSY; |
Heiko Carstens | 2c2df11 | 2010-02-26 22:37:34 +0100 | [diff] [blame] | 861 | /* disallow configuration changes of online cpus and cpu 0 */ |
| 862 | if (cpu_online(cpu) || cpu == 0) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 863 | goto out; |
| 864 | rc = 0; |
| 865 | switch (val) { |
| 866 | case 0: |
| 867 | if (smp_cpu_state[cpu] == CPU_STATE_CONFIGURED) { |
| 868 | rc = sclp_cpu_deconfigure(__cpu_logical_map[cpu]); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 869 | if (!rc) { |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 870 | smp_cpu_state[cpu] = CPU_STATE_STANDBY; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 871 | smp_cpu_polarization[cpu] = POLARIZATION_UNKNWN; |
| 872 | } |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 873 | } |
| 874 | break; |
| 875 | case 1: |
| 876 | if (smp_cpu_state[cpu] == CPU_STATE_STANDBY) { |
| 877 | rc = sclp_cpu_configure(__cpu_logical_map[cpu]); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 878 | if (!rc) { |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 879 | smp_cpu_state[cpu] = CPU_STATE_CONFIGURED; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 880 | smp_cpu_polarization[cpu] = POLARIZATION_UNKNWN; |
| 881 | } |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 882 | } |
| 883 | break; |
| 884 | default: |
| 885 | break; |
| 886 | } |
| 887 | out: |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 888 | mutex_unlock(&smp_cpu_state_mutex); |
Heiko Carstens | 0b18d31 | 2008-04-30 13:38:36 +0200 | [diff] [blame] | 889 | put_online_cpus(); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 890 | return rc ? rc : count; |
| 891 | } |
| 892 | static SYSDEV_ATTR(configure, 0644, cpu_configure_show, cpu_configure_store); |
| 893 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 894 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 895 | static ssize_t cpu_polarization_show(struct sys_device *dev, |
| 896 | struct sysdev_attribute *attr, char *buf) |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 897 | { |
| 898 | int cpu = dev->id; |
| 899 | ssize_t count; |
| 900 | |
| 901 | mutex_lock(&smp_cpu_state_mutex); |
| 902 | switch (smp_cpu_polarization[cpu]) { |
| 903 | case POLARIZATION_HRZ: |
| 904 | count = sprintf(buf, "horizontal\n"); |
| 905 | break; |
| 906 | case POLARIZATION_VL: |
| 907 | count = sprintf(buf, "vertical:low\n"); |
| 908 | break; |
| 909 | case POLARIZATION_VM: |
| 910 | count = sprintf(buf, "vertical:medium\n"); |
| 911 | break; |
| 912 | case POLARIZATION_VH: |
| 913 | count = sprintf(buf, "vertical:high\n"); |
| 914 | break; |
| 915 | default: |
| 916 | count = sprintf(buf, "unknown\n"); |
| 917 | break; |
| 918 | } |
| 919 | mutex_unlock(&smp_cpu_state_mutex); |
| 920 | return count; |
| 921 | } |
| 922 | static SYSDEV_ATTR(polarization, 0444, cpu_polarization_show, NULL); |
| 923 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 924 | static ssize_t show_cpu_address(struct sys_device *dev, |
| 925 | struct sysdev_attribute *attr, char *buf) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 926 | { |
| 927 | return sprintf(buf, "%d\n", __cpu_logical_map[dev->id]); |
| 928 | } |
| 929 | static SYSDEV_ATTR(address, 0444, show_cpu_address, NULL); |
| 930 | |
| 931 | |
| 932 | static struct attribute *cpu_common_attrs[] = { |
| 933 | #ifdef CONFIG_HOTPLUG_CPU |
| 934 | &attr_configure.attr, |
| 935 | #endif |
| 936 | &attr_address.attr, |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 937 | &attr_polarization.attr, |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 938 | NULL, |
| 939 | }; |
| 940 | |
| 941 | static struct attribute_group cpu_common_attr_group = { |
| 942 | .attrs = cpu_common_attrs, |
| 943 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 945 | static ssize_t show_capability(struct sys_device *dev, |
| 946 | struct sysdev_attribute *attr, char *buf) |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 947 | { |
| 948 | unsigned int capability; |
| 949 | int rc; |
| 950 | |
| 951 | rc = get_cpu_capability(&capability); |
| 952 | if (rc) |
| 953 | return rc; |
| 954 | return sprintf(buf, "%u\n", capability); |
| 955 | } |
| 956 | static SYSDEV_ATTR(capability, 0444, show_capability, NULL); |
| 957 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 958 | static ssize_t show_idle_count(struct sys_device *dev, |
| 959 | struct sysdev_attribute *attr, char *buf) |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 960 | { |
| 961 | struct s390_idle_data *idle; |
| 962 | unsigned long long idle_count; |
Martin Schwidefsky | e98bbaa | 2009-06-22 12:08:20 +0200 | [diff] [blame] | 963 | unsigned int sequence; |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 964 | |
| 965 | idle = &per_cpu(s390_idle, dev->id); |
Martin Schwidefsky | e98bbaa | 2009-06-22 12:08:20 +0200 | [diff] [blame] | 966 | repeat: |
| 967 | sequence = idle->sequence; |
| 968 | smp_rmb(); |
| 969 | if (sequence & 1) |
| 970 | goto repeat; |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 971 | idle_count = idle->idle_count; |
Martin Schwidefsky | 6f43092 | 2008-12-31 15:11:40 +0100 | [diff] [blame] | 972 | if (idle->idle_enter) |
| 973 | idle_count++; |
Martin Schwidefsky | e98bbaa | 2009-06-22 12:08:20 +0200 | [diff] [blame] | 974 | smp_rmb(); |
| 975 | if (idle->sequence != sequence) |
| 976 | goto repeat; |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 977 | return sprintf(buf, "%llu\n", idle_count); |
| 978 | } |
| 979 | static SYSDEV_ATTR(idle_count, 0444, show_idle_count, NULL); |
| 980 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 981 | static ssize_t show_idle_time(struct sys_device *dev, |
| 982 | struct sysdev_attribute *attr, char *buf) |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 983 | { |
| 984 | struct s390_idle_data *idle; |
Martin Schwidefsky | 6f43092 | 2008-12-31 15:11:40 +0100 | [diff] [blame] | 985 | unsigned long long now, idle_time, idle_enter; |
Martin Schwidefsky | e98bbaa | 2009-06-22 12:08:20 +0200 | [diff] [blame] | 986 | unsigned int sequence; |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 987 | |
| 988 | idle = &per_cpu(s390_idle, dev->id); |
Martin Schwidefsky | 6f43092 | 2008-12-31 15:11:40 +0100 | [diff] [blame] | 989 | now = get_clock(); |
Martin Schwidefsky | e98bbaa | 2009-06-22 12:08:20 +0200 | [diff] [blame] | 990 | repeat: |
| 991 | sequence = idle->sequence; |
| 992 | smp_rmb(); |
| 993 | if (sequence & 1) |
| 994 | goto repeat; |
Martin Schwidefsky | 6f43092 | 2008-12-31 15:11:40 +0100 | [diff] [blame] | 995 | idle_time = idle->idle_time; |
| 996 | idle_enter = idle->idle_enter; |
| 997 | if (idle_enter != 0ULL && idle_enter < now) |
| 998 | idle_time += now - idle_enter; |
Martin Schwidefsky | e98bbaa | 2009-06-22 12:08:20 +0200 | [diff] [blame] | 999 | smp_rmb(); |
| 1000 | if (idle->sequence != sequence) |
| 1001 | goto repeat; |
Martin Schwidefsky | 6f43092 | 2008-12-31 15:11:40 +0100 | [diff] [blame] | 1002 | return sprintf(buf, "%llu\n", idle_time >> 12); |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 1003 | } |
Heiko Carstens | 69d39d6 | 2007-11-05 11:10:13 +0100 | [diff] [blame] | 1004 | static SYSDEV_ATTR(idle_time_us, 0444, show_idle_time, NULL); |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 1005 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1006 | static struct attribute *cpu_online_attrs[] = { |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 1007 | &attr_capability.attr, |
| 1008 | &attr_idle_count.attr, |
Heiko Carstens | 69d39d6 | 2007-11-05 11:10:13 +0100 | [diff] [blame] | 1009 | &attr_idle_time_us.attr, |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 1010 | NULL, |
| 1011 | }; |
| 1012 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1013 | static struct attribute_group cpu_online_attr_group = { |
| 1014 | .attrs = cpu_online_attrs, |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 1015 | }; |
| 1016 | |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 1017 | static int __cpuinit smp_cpu_notify(struct notifier_block *self, |
| 1018 | unsigned long action, void *hcpu) |
| 1019 | { |
| 1020 | unsigned int cpu = (unsigned int)(long)hcpu; |
| 1021 | struct cpu *c = &per_cpu(cpu_devices, cpu); |
| 1022 | struct sys_device *s = &c->sysdev; |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 1023 | struct s390_idle_data *idle; |
Akinobu Mita | d882ba6 | 2010-05-26 14:43:34 -0700 | [diff] [blame] | 1024 | int err = 0; |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 1025 | |
| 1026 | switch (action) { |
| 1027 | case CPU_ONLINE: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 1028 | case CPU_ONLINE_FROZEN: |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 1029 | idle = &per_cpu(s390_idle, cpu); |
Martin Schwidefsky | e98bbaa | 2009-06-22 12:08:20 +0200 | [diff] [blame] | 1030 | memset(idle, 0, sizeof(struct s390_idle_data)); |
Akinobu Mita | d882ba6 | 2010-05-26 14:43:34 -0700 | [diff] [blame] | 1031 | err = sysfs_create_group(&s->kobj, &cpu_online_attr_group); |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 1032 | break; |
| 1033 | case CPU_DEAD: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 1034 | case CPU_DEAD_FROZEN: |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1035 | sysfs_remove_group(&s->kobj, &cpu_online_attr_group); |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 1036 | break; |
| 1037 | } |
Akinobu Mita | d882ba6 | 2010-05-26 14:43:34 -0700 | [diff] [blame] | 1038 | return notifier_from_errno(err); |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 1039 | } |
| 1040 | |
| 1041 | static struct notifier_block __cpuinitdata smp_cpu_nb = { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 1042 | .notifier_call = smp_cpu_notify, |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 1043 | }; |
| 1044 | |
Heiko Carstens | 2bc89b5 | 2008-02-05 16:50:40 +0100 | [diff] [blame] | 1045 | static int __devinit smp_add_present_cpu(int cpu) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1046 | { |
| 1047 | struct cpu *c = &per_cpu(cpu_devices, cpu); |
| 1048 | struct sys_device *s = &c->sysdev; |
| 1049 | int rc; |
| 1050 | |
| 1051 | c->hotpluggable = 1; |
| 1052 | rc = register_cpu(c, cpu); |
| 1053 | if (rc) |
| 1054 | goto out; |
| 1055 | rc = sysfs_create_group(&s->kobj, &cpu_common_attr_group); |
| 1056 | if (rc) |
| 1057 | goto out_cpu; |
| 1058 | if (!cpu_online(cpu)) |
| 1059 | goto out; |
| 1060 | rc = sysfs_create_group(&s->kobj, &cpu_online_attr_group); |
| 1061 | if (!rc) |
| 1062 | return 0; |
| 1063 | sysfs_remove_group(&s->kobj, &cpu_common_attr_group); |
| 1064 | out_cpu: |
| 1065 | #ifdef CONFIG_HOTPLUG_CPU |
| 1066 | unregister_cpu(c); |
| 1067 | #endif |
| 1068 | out: |
| 1069 | return rc; |
| 1070 | } |
| 1071 | |
| 1072 | #ifdef CONFIG_HOTPLUG_CPU |
Heiko Carstens | 1e48951 | 2008-04-30 13:38:37 +0200 | [diff] [blame] | 1073 | |
Heiko Carstens | 67060d9 | 2008-05-30 10:03:27 +0200 | [diff] [blame] | 1074 | int __ref smp_rescan_cpus(void) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1075 | { |
| 1076 | cpumask_t newcpus; |
| 1077 | int cpu; |
| 1078 | int rc; |
| 1079 | |
Martin Schwidefsky | 9d40d2e | 2008-01-26 14:11:31 +0100 | [diff] [blame] | 1080 | get_online_cpus(); |
Heiko Carstens | 0b18d31 | 2008-04-30 13:38:36 +0200 | [diff] [blame] | 1081 | mutex_lock(&smp_cpu_state_mutex); |
KOSAKI Motohiro | 0f1959f | 2011-05-23 10:24:36 +0200 | [diff] [blame] | 1082 | cpumask_copy(&newcpus, cpu_present_mask); |
Heiko Carstens | 1e48951 | 2008-04-30 13:38:37 +0200 | [diff] [blame] | 1083 | rc = __smp_rescan_cpus(); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1084 | if (rc) |
| 1085 | goto out; |
KOSAKI Motohiro | 0f1959f | 2011-05-23 10:24:36 +0200 | [diff] [blame] | 1086 | cpumask_andnot(&newcpus, cpu_present_mask, &newcpus); |
| 1087 | for_each_cpu(cpu, &newcpus) { |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1088 | rc = smp_add_present_cpu(cpu); |
| 1089 | if (rc) |
KOSAKI Motohiro | 0f1959f | 2011-05-23 10:24:36 +0200 | [diff] [blame] | 1090 | set_cpu_present(cpu, false); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1091 | } |
| 1092 | rc = 0; |
| 1093 | out: |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1094 | mutex_unlock(&smp_cpu_state_mutex); |
Heiko Carstens | 0b18d31 | 2008-04-30 13:38:36 +0200 | [diff] [blame] | 1095 | put_online_cpus(); |
KOSAKI Motohiro | 0f1959f | 2011-05-23 10:24:36 +0200 | [diff] [blame] | 1096 | if (!cpumask_empty(&newcpus)) |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1097 | topology_schedule_update(); |
Heiko Carstens | 1e48951 | 2008-04-30 13:38:37 +0200 | [diff] [blame] | 1098 | return rc; |
| 1099 | } |
| 1100 | |
Andi Kleen | c9be0a3 | 2010-01-05 12:47:58 +0100 | [diff] [blame] | 1101 | static ssize_t __ref rescan_store(struct sysdev_class *class, |
| 1102 | struct sysdev_class_attribute *attr, |
| 1103 | const char *buf, |
Heiko Carstens | 1e48951 | 2008-04-30 13:38:37 +0200 | [diff] [blame] | 1104 | size_t count) |
| 1105 | { |
| 1106 | int rc; |
| 1107 | |
| 1108 | rc = smp_rescan_cpus(); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1109 | return rc ? rc : count; |
| 1110 | } |
Heiko Carstens | da5aae7 | 2008-10-28 11:10:16 +0100 | [diff] [blame] | 1111 | static SYSDEV_CLASS_ATTR(rescan, 0200, NULL, rescan_store); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1112 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 1113 | |
Heiko Carstens | 5fbcae5 | 2010-02-12 11:19:24 +0100 | [diff] [blame] | 1114 | static ssize_t dispatching_show(struct sysdev_class *class, |
| 1115 | struct sysdev_class_attribute *attr, |
| 1116 | char *buf) |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1117 | { |
| 1118 | ssize_t count; |
| 1119 | |
| 1120 | mutex_lock(&smp_cpu_state_mutex); |
| 1121 | count = sprintf(buf, "%d\n", cpu_management); |
| 1122 | mutex_unlock(&smp_cpu_state_mutex); |
| 1123 | return count; |
| 1124 | } |
| 1125 | |
Andi Kleen | c9be0a3 | 2010-01-05 12:47:58 +0100 | [diff] [blame] | 1126 | static ssize_t dispatching_store(struct sysdev_class *dev, |
| 1127 | struct sysdev_class_attribute *attr, |
| 1128 | const char *buf, |
Heiko Carstens | da5aae7 | 2008-10-28 11:10:16 +0100 | [diff] [blame] | 1129 | size_t count) |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1130 | { |
| 1131 | int val, rc; |
| 1132 | char delim; |
| 1133 | |
| 1134 | if (sscanf(buf, "%d %c", &val, &delim) != 1) |
| 1135 | return -EINVAL; |
| 1136 | if (val != 0 && val != 1) |
| 1137 | return -EINVAL; |
| 1138 | rc = 0; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1139 | get_online_cpus(); |
Heiko Carstens | 0b18d31 | 2008-04-30 13:38:36 +0200 | [diff] [blame] | 1140 | mutex_lock(&smp_cpu_state_mutex); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1141 | if (cpu_management == val) |
| 1142 | goto out; |
| 1143 | rc = topology_set_cpu_management(val); |
| 1144 | if (!rc) |
| 1145 | cpu_management = val; |
| 1146 | out: |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1147 | mutex_unlock(&smp_cpu_state_mutex); |
Heiko Carstens | 0b18d31 | 2008-04-30 13:38:36 +0200 | [diff] [blame] | 1148 | put_online_cpus(); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1149 | return rc ? rc : count; |
| 1150 | } |
Heiko Carstens | da5aae7 | 2008-10-28 11:10:16 +0100 | [diff] [blame] | 1151 | static SYSDEV_CLASS_ATTR(dispatching, 0644, dispatching_show, |
| 1152 | dispatching_store); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1153 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1154 | static int __init topology_init(void) |
| 1155 | { |
| 1156 | int cpu; |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 1157 | int rc; |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 1158 | |
| 1159 | register_cpu_notifier(&smp_cpu_nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1161 | #ifdef CONFIG_HOTPLUG_CPU |
Heiko Carstens | da5aae7 | 2008-10-28 11:10:16 +0100 | [diff] [blame] | 1162 | rc = sysdev_class_create_file(&cpu_sysdev_class, &attr_rescan); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1163 | if (rc) |
| 1164 | return rc; |
| 1165 | #endif |
Heiko Carstens | da5aae7 | 2008-10-28 11:10:16 +0100 | [diff] [blame] | 1166 | rc = sysdev_class_create_file(&cpu_sysdev_class, &attr_dispatching); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1167 | if (rc) |
| 1168 | return rc; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1169 | for_each_present_cpu(cpu) { |
| 1170 | rc = smp_add_present_cpu(cpu); |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 1171 | if (rc) |
| 1172 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | } |
| 1174 | return 0; |
| 1175 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1176 | subsys_initcall(topology_init); |