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> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame^] | 39 | #include <linux/slab.h> |
Heiko Carstens | cbb870c | 2010-02-26 22:37:43 +0100 | [diff] [blame] | 40 | #include <asm/asm-offsets.h> |
Michael Holzheu | 46b05d2 | 2007-02-21 10:55:21 +0100 | [diff] [blame] | 41 | #include <asm/ipl.h> |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 42 | #include <asm/setup.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | #include <asm/sigp.h> |
| 44 | #include <asm/pgalloc.h> |
| 45 | #include <asm/irq.h> |
| 46 | #include <asm/s390_ext.h> |
| 47 | #include <asm/cpcmd.h> |
| 48 | #include <asm/tlbflush.h> |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 49 | #include <asm/timer.h> |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 50 | #include <asm/lowcore.h> |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 51 | #include <asm/sclp.h> |
Martin Schwidefsky | 76d4e00 | 2009-06-12 10:26:21 +0200 | [diff] [blame] | 52 | #include <asm/cputime.h> |
Martin Schwidefsky | c742b31 | 2008-12-31 15:11:42 +0100 | [diff] [blame] | 53 | #include <asm/vdso.h> |
Heiko Carstens | 4bb5e07 | 2009-09-11 10:29:03 +0200 | [diff] [blame] | 54 | #include <asm/cpu.h> |
Heiko Carstens | a806170 | 2008-04-17 07:46:26 +0200 | [diff] [blame] | 55 | #include "entry.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
Heiko Carstens | fb380aa | 2010-01-13 20:44:37 +0100 | [diff] [blame] | 57 | /* logical cpu to cpu address */ |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 58 | unsigned short __cpu_logical_map[NR_CPUS]; |
Heiko Carstens | fb380aa | 2010-01-13 20:44:37 +0100 | [diff] [blame] | 59 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | static struct task_struct *current_set[NR_CPUS]; |
| 61 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 62 | static u8 smp_cpu_type; |
| 63 | static int smp_use_sigp_detection; |
| 64 | |
| 65 | enum s390_cpu_state { |
| 66 | CPU_STATE_STANDBY, |
| 67 | CPU_STATE_CONFIGURED, |
| 68 | }; |
| 69 | |
Heiko Carstens | dbd70fb | 2008-04-17 07:46:12 +0200 | [diff] [blame] | 70 | DEFINE_MUTEX(smp_cpu_state_mutex); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 71 | int smp_cpu_polarization[NR_CPUS]; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 72 | static int smp_cpu_state[NR_CPUS]; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 73 | static int cpu_management; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 74 | |
| 75 | static DEFINE_PER_CPU(struct cpu, cpu_devices); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 76 | |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 77 | static void smp_ext_bitcall(int, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 79 | static int raw_cpu_stopped(int cpu) |
Heiko Carstens | 5c0b912 | 2009-09-11 10:29:05 +0200 | [diff] [blame] | 80 | { |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 81 | u32 status; |
Heiko Carstens | 5c0b912 | 2009-09-11 10:29:05 +0200 | [diff] [blame] | 82 | |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 83 | switch (raw_sigp_ps(&status, 0, cpu, sigp_sense)) { |
Heiko Carstens | 5c0b912 | 2009-09-11 10:29:05 +0200 | [diff] [blame] | 84 | case sigp_status_stored: |
| 85 | /* Check for stopped and check stop state */ |
| 86 | if (status & 0x50) |
| 87 | return 1; |
| 88 | break; |
| 89 | default: |
| 90 | break; |
| 91 | } |
| 92 | return 0; |
| 93 | } |
| 94 | |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 95 | static inline int cpu_stopped(int cpu) |
| 96 | { |
| 97 | return raw_cpu_stopped(cpu_logical_map(cpu)); |
| 98 | } |
| 99 | |
Heiko Carstens | 2c2df11 | 2010-02-26 22:37:34 +0100 | [diff] [blame] | 100 | void smp_switch_to_ipl_cpu(void (*func)(void *), void *data) |
| 101 | { |
| 102 | struct _lowcore *lc, *current_lc; |
| 103 | struct stack_frame *sf; |
| 104 | struct pt_regs *regs; |
| 105 | unsigned long sp; |
| 106 | |
| 107 | if (smp_processor_id() == 0) |
| 108 | func(data); |
| 109 | __load_psw_mask(PSW_BASE_BITS | PSW_DEFAULT_KEY); |
| 110 | /* Disable lowcore protection */ |
| 111 | __ctl_clear_bit(0, 28); |
| 112 | current_lc = lowcore_ptr[smp_processor_id()]; |
| 113 | lc = lowcore_ptr[0]; |
| 114 | if (!lc) |
| 115 | lc = current_lc; |
| 116 | lc->restart_psw.mask = PSW_BASE_BITS | PSW_DEFAULT_KEY; |
| 117 | lc->restart_psw.addr = PSW_ADDR_AMODE | (unsigned long) smp_restart_cpu; |
| 118 | if (!cpu_online(0)) |
| 119 | smp_switch_to_cpu(func, data, 0, stap(), __cpu_logical_map[0]); |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 120 | while (sigp(0, sigp_stop_and_store_status) == sigp_busy) |
Heiko Carstens | 2c2df11 | 2010-02-26 22:37:34 +0100 | [diff] [blame] | 121 | cpu_relax(); |
| 122 | sp = lc->panic_stack; |
| 123 | sp -= sizeof(struct pt_regs); |
| 124 | regs = (struct pt_regs *) sp; |
| 125 | memcpy(®s->gprs, ¤t_lc->gpregs_save_area, sizeof(regs->gprs)); |
Heiko Carstens | cbb870c | 2010-02-26 22:37:43 +0100 | [diff] [blame] | 126 | regs->psw = lc->psw_save_area; |
Heiko Carstens | 2c2df11 | 2010-02-26 22:37:34 +0100 | [diff] [blame] | 127 | sp -= STACK_FRAME_OVERHEAD; |
| 128 | sf = (struct stack_frame *) sp; |
| 129 | sf->back_chain = regs->gprs[15]; |
| 130 | smp_switch_to_cpu(func, data, sp, stap(), __cpu_logical_map[0]); |
| 131 | } |
| 132 | |
Heiko Carstens | 677d762 | 2007-11-20 11:13:37 +0100 | [diff] [blame] | 133 | void smp_send_stop(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 135 | int cpu, rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | |
Heiko Carstens | 677d762 | 2007-11-20 11:13:37 +0100 | [diff] [blame] | 137 | /* Disable all interrupts/machine checks */ |
| 138 | __load_psw_mask(psw_kernel_bits & ~PSW_MASK_MCHECK); |
Christian Borntraeger | 3324e60 | 2009-03-26 15:23:56 +0100 | [diff] [blame] | 139 | trace_hardirqs_off(); |
Heiko Carstens | 677d762 | 2007-11-20 11:13:37 +0100 | [diff] [blame] | 140 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 141 | /* stop all processors */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | for_each_online_cpu(cpu) { |
| 143 | if (cpu == smp_processor_id()) |
| 144 | continue; |
| 145 | do { |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 146 | rc = sigp(cpu, sigp_stop); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | } while (rc == sigp_busy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 148 | |
Heiko Carstens | 5c0b912 | 2009-09-11 10:29:05 +0200 | [diff] [blame] | 149 | while (!cpu_stopped(cpu)) |
Heiko Carstens | c6b5b84 | 2006-12-04 15:40:33 +0100 | [diff] [blame] | 150 | cpu_relax(); |
| 151 | } |
| 152 | } |
| 153 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | * This is the main routine where commands issued by other |
| 156 | * cpus are handled. |
| 157 | */ |
| 158 | |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 159 | static void do_ext_call_interrupt(__u16 code) |
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 | unsigned long bits; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 162 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 163 | /* |
| 164 | * handle bit signal external calls |
| 165 | * |
| 166 | * For the ec_schedule signal we have to do nothing. All the work |
| 167 | * is done automatically when we return from the interrupt. |
| 168 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | bits = xchg(&S390_lowcore.ext_call_fast, 0); |
| 170 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 171 | if (test_bit(ec_call_function, &bits)) |
Heiko Carstens | ca9fc75 | 2008-12-25 13:38:39 +0100 | [diff] [blame] | 172 | generic_smp_call_function_interrupt(); |
| 173 | |
| 174 | if (test_bit(ec_call_function_single, &bits)) |
| 175 | generic_smp_call_function_single_interrupt(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 176 | } |
| 177 | |
| 178 | /* |
| 179 | * Send an external call sigp to another cpu and return without waiting |
| 180 | * for its completion. |
| 181 | */ |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 182 | static void smp_ext_bitcall(int cpu, int sig) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 184 | /* |
| 185 | * Set signaling bit in lowcore of target cpu and kick it |
| 186 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 187 | set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast); |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 188 | while (sigp(cpu, sigp_emergency_signal) == sigp_busy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | udelay(10); |
| 190 | } |
| 191 | |
Rusty Russell | 630cd04 | 2009-09-24 09:34:45 -0600 | [diff] [blame] | 192 | void arch_send_call_function_ipi_mask(const struct cpumask *mask) |
Heiko Carstens | ca9fc75 | 2008-12-25 13:38:39 +0100 | [diff] [blame] | 193 | { |
| 194 | int cpu; |
| 195 | |
Rusty Russell | 630cd04 | 2009-09-24 09:34:45 -0600 | [diff] [blame] | 196 | for_each_cpu(cpu, mask) |
Heiko Carstens | ca9fc75 | 2008-12-25 13:38:39 +0100 | [diff] [blame] | 197 | smp_ext_bitcall(cpu, ec_call_function); |
| 198 | } |
| 199 | |
| 200 | void arch_send_call_function_single_ipi(int cpu) |
| 201 | { |
| 202 | smp_ext_bitcall(cpu, ec_call_function_single); |
| 203 | } |
| 204 | |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 205 | #ifndef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | /* |
| 207 | * this function sends a 'purge tlb' signal to another CPU. |
| 208 | */ |
Heiko Carstens | a806170 | 2008-04-17 07:46:26 +0200 | [diff] [blame] | 209 | static void smp_ptlb_callback(void *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | { |
Martin Schwidefsky | ba8a922 | 2007-10-22 12:52:44 +0200 | [diff] [blame] | 211 | __tlb_flush_local(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | } |
| 213 | |
| 214 | void smp_ptlb_all(void) |
| 215 | { |
Jens Axboe | 15c8b6c | 2008-05-09 09:39:44 +0200 | [diff] [blame] | 216 | on_each_cpu(smp_ptlb_callback, NULL, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | } |
| 218 | EXPORT_SYMBOL(smp_ptlb_all); |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 219 | #endif /* ! CONFIG_64BIT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | |
| 221 | /* |
| 222 | * this function sends a 'reschedule' IPI to another CPU. |
| 223 | * it goes straight through and wastes no time serializing |
| 224 | * anything. Worst case is that we lose a reschedule ... |
| 225 | */ |
| 226 | void smp_send_reschedule(int cpu) |
| 227 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 228 | smp_ext_bitcall(cpu, ec_schedule); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | } |
| 230 | |
| 231 | /* |
| 232 | * parameter area for the set/clear control bit callbacks |
| 233 | */ |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 234 | struct ec_creg_mask_parms { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 235 | unsigned long orvals[16]; |
| 236 | unsigned long andvals[16]; |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 237 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 238 | |
| 239 | /* |
| 240 | * callback for setting/clearing control bits |
| 241 | */ |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 242 | static void smp_ctl_bit_callback(void *info) |
| 243 | { |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 244 | struct ec_creg_mask_parms *pp = info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 245 | unsigned long cregs[16]; |
| 246 | int i; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 247 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 248 | __ctl_store(cregs, 0, 15); |
| 249 | for (i = 0; i <= 15; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 250 | cregs[i] = (cregs[i] & pp->andvals[i]) | pp->orvals[i]; |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 251 | __ctl_load(cregs, 0, 15); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 252 | } |
| 253 | |
| 254 | /* |
| 255 | * Set a bit in a control register of all cpus |
| 256 | */ |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 257 | void smp_ctl_set_bit(int cr, int bit) |
| 258 | { |
| 259 | struct ec_creg_mask_parms parms; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 260 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 261 | memset(&parms.orvals, 0, sizeof(parms.orvals)); |
| 262 | memset(&parms.andvals, 0xff, sizeof(parms.andvals)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | parms.orvals[cr] = 1 << bit; |
Jens Axboe | 15c8b6c | 2008-05-09 09:39:44 +0200 | [diff] [blame] | 264 | on_each_cpu(smp_ctl_bit_callback, &parms, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | } |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 266 | EXPORT_SYMBOL(smp_ctl_set_bit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | |
| 268 | /* |
| 269 | * Clear a bit in a control register of all cpus |
| 270 | */ |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 271 | void smp_ctl_clear_bit(int cr, int bit) |
| 272 | { |
| 273 | struct ec_creg_mask_parms parms; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 274 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 275 | memset(&parms.orvals, 0, sizeof(parms.orvals)); |
| 276 | memset(&parms.andvals, 0xff, sizeof(parms.andvals)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 277 | parms.andvals[cr] = ~(1L << bit); |
Jens Axboe | 15c8b6c | 2008-05-09 09:39:44 +0200 | [diff] [blame] | 278 | on_each_cpu(smp_ctl_bit_callback, &parms, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 279 | } |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 280 | EXPORT_SYMBOL(smp_ctl_clear_bit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | |
Michael Holzheu | 59f2e69 | 2009-03-26 15:24:46 +0100 | [diff] [blame] | 282 | #ifdef CONFIG_ZFCPDUMP |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 283 | |
Heiko Carstens | 285f672 | 2007-07-10 11:24:13 +0200 | [diff] [blame] | 284 | 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] | 285 | { |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 286 | if (ipl_info.type != IPL_TYPE_FCP_DUMP) |
| 287 | return; |
Heiko Carstens | 285f672 | 2007-07-10 11:24:13 +0200 | [diff] [blame] | 288 | if (cpu >= NR_CPUS) { |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 289 | pr_warning("CPU %i exceeds the maximum %i and is excluded from " |
| 290 | "the dump\n", cpu, NR_CPUS - 1); |
Heiko Carstens | 285f672 | 2007-07-10 11:24:13 +0200 | [diff] [blame] | 291 | return; |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 292 | } |
Heiko Carstens | f64ca21 | 2010-02-26 22:37:32 +0100 | [diff] [blame] | 293 | zfcpdump_save_areas[cpu] = kmalloc(sizeof(struct save_area), GFP_KERNEL); |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 294 | while (raw_sigp(phy_cpu, sigp_stop_and_store_status) == sigp_busy) |
Heiko Carstens | 285f672 | 2007-07-10 11:24:13 +0200 | [diff] [blame] | 295 | cpu_relax(); |
Michael Holzheu | 92fe313 | 2010-03-24 11:49:50 +0100 | [diff] [blame] | 296 | memcpy_real(zfcpdump_save_areas[cpu], |
| 297 | (void *)(unsigned long) store_prefix() + SAVE_AREA_BASE, |
| 298 | sizeof(struct save_area)); |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 299 | } |
| 300 | |
Heiko Carstens | f64ca21 | 2010-02-26 22:37:32 +0100 | [diff] [blame] | 301 | struct save_area *zfcpdump_save_areas[NR_CPUS + 1]; |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 302 | EXPORT_SYMBOL_GPL(zfcpdump_save_areas); |
| 303 | |
| 304 | #else |
Heiko Carstens | 285f672 | 2007-07-10 11:24:13 +0200 | [diff] [blame] | 305 | |
| 306 | static inline void smp_get_save_area(unsigned int cpu, unsigned int phy_cpu) { } |
| 307 | |
Michael Holzheu | 59f2e69 | 2009-03-26 15:24:46 +0100 | [diff] [blame] | 308 | #endif /* CONFIG_ZFCPDUMP */ |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 309 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 310 | static int cpu_known(int cpu_id) |
| 311 | { |
| 312 | int cpu; |
| 313 | |
| 314 | for_each_present_cpu(cpu) { |
| 315 | if (__cpu_logical_map[cpu] == cpu_id) |
| 316 | return 1; |
| 317 | } |
| 318 | return 0; |
| 319 | } |
| 320 | |
| 321 | static int smp_rescan_cpus_sigp(cpumask_t avail) |
| 322 | { |
| 323 | int cpu_id, logical_cpu; |
| 324 | |
Rusty Russell | 93632d1 | 2009-03-26 15:24:59 +0100 | [diff] [blame] | 325 | logical_cpu = cpumask_first(&avail); |
| 326 | if (logical_cpu >= nr_cpu_ids) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 327 | return 0; |
Heiko Carstens | 4bb5e07 | 2009-09-11 10:29:03 +0200 | [diff] [blame] | 328 | for (cpu_id = 0; cpu_id <= MAX_CPU_ADDRESS; cpu_id++) { |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 329 | if (cpu_known(cpu_id)) |
| 330 | continue; |
| 331 | __cpu_logical_map[logical_cpu] = cpu_id; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 332 | smp_cpu_polarization[logical_cpu] = POLARIZATION_UNKNWN; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 333 | if (!cpu_stopped(logical_cpu)) |
| 334 | continue; |
| 335 | cpu_set(logical_cpu, cpu_present_map); |
| 336 | smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED; |
Rusty Russell | 93632d1 | 2009-03-26 15:24:59 +0100 | [diff] [blame] | 337 | logical_cpu = cpumask_next(logical_cpu, &avail); |
| 338 | if (logical_cpu >= nr_cpu_ids) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 339 | break; |
| 340 | } |
| 341 | return 0; |
| 342 | } |
| 343 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 344 | static int smp_rescan_cpus_sclp(cpumask_t avail) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 345 | { |
| 346 | struct sclp_cpu_info *info; |
| 347 | int cpu_id, logical_cpu, cpu; |
| 348 | int rc; |
| 349 | |
Rusty Russell | 93632d1 | 2009-03-26 15:24:59 +0100 | [diff] [blame] | 350 | logical_cpu = cpumask_first(&avail); |
| 351 | if (logical_cpu >= nr_cpu_ids) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 352 | return 0; |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 353 | info = kmalloc(sizeof(*info), GFP_KERNEL); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 354 | if (!info) |
| 355 | return -ENOMEM; |
| 356 | rc = sclp_get_cpu_info(info); |
| 357 | if (rc) |
| 358 | goto out; |
| 359 | for (cpu = 0; cpu < info->combined; cpu++) { |
| 360 | if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type) |
| 361 | continue; |
| 362 | cpu_id = info->cpu[cpu].address; |
| 363 | if (cpu_known(cpu_id)) |
| 364 | continue; |
| 365 | __cpu_logical_map[logical_cpu] = cpu_id; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 366 | smp_cpu_polarization[logical_cpu] = POLARIZATION_UNKNWN; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 367 | cpu_set(logical_cpu, cpu_present_map); |
| 368 | if (cpu >= info->configured) |
| 369 | smp_cpu_state[logical_cpu] = CPU_STATE_STANDBY; |
| 370 | else |
| 371 | smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED; |
Rusty Russell | 93632d1 | 2009-03-26 15:24:59 +0100 | [diff] [blame] | 372 | logical_cpu = cpumask_next(logical_cpu, &avail); |
| 373 | if (logical_cpu >= nr_cpu_ids) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 374 | break; |
| 375 | } |
| 376 | out: |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 377 | kfree(info); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 378 | return rc; |
| 379 | } |
| 380 | |
Heiko Carstens | 1e48951 | 2008-04-30 13:38:37 +0200 | [diff] [blame] | 381 | static int __smp_rescan_cpus(void) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 382 | { |
| 383 | cpumask_t avail; |
| 384 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 385 | cpus_xor(avail, cpu_possible_map, cpu_present_map); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 386 | if (smp_use_sigp_detection) |
| 387 | return smp_rescan_cpus_sigp(avail); |
| 388 | else |
| 389 | return smp_rescan_cpus_sclp(avail); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | } |
| 391 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 392 | static void __init smp_detect_cpus(void) |
| 393 | { |
| 394 | unsigned int cpu, c_cpus, s_cpus; |
| 395 | struct sclp_cpu_info *info; |
| 396 | u16 boot_cpu_addr, cpu_addr; |
| 397 | |
| 398 | c_cpus = 1; |
| 399 | s_cpus = 0; |
Martin Schwidefsky | 7b46848 | 2009-03-26 15:24:42 +0100 | [diff] [blame] | 400 | boot_cpu_addr = __cpu_logical_map[0]; |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 401 | info = kmalloc(sizeof(*info), GFP_KERNEL); |
| 402 | if (!info) |
| 403 | panic("smp_detect_cpus failed to allocate memory\n"); |
| 404 | /* Use sigp detection algorithm if sclp doesn't work. */ |
| 405 | if (sclp_get_cpu_info(info)) { |
| 406 | smp_use_sigp_detection = 1; |
Heiko Carstens | 4bb5e07 | 2009-09-11 10:29:03 +0200 | [diff] [blame] | 407 | for (cpu = 0; cpu <= MAX_CPU_ADDRESS; cpu++) { |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 408 | if (cpu == boot_cpu_addr) |
| 409 | continue; |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 410 | if (!raw_cpu_stopped(cpu)) |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 411 | continue; |
| 412 | smp_get_save_area(c_cpus, cpu); |
| 413 | c_cpus++; |
| 414 | } |
| 415 | goto out; |
| 416 | } |
| 417 | |
| 418 | if (info->has_cpu_type) { |
| 419 | for (cpu = 0; cpu < info->combined; cpu++) { |
| 420 | if (info->cpu[cpu].address == boot_cpu_addr) { |
| 421 | smp_cpu_type = info->cpu[cpu].type; |
| 422 | break; |
| 423 | } |
| 424 | } |
| 425 | } |
| 426 | |
| 427 | for (cpu = 0; cpu < info->combined; cpu++) { |
| 428 | if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type) |
| 429 | continue; |
| 430 | cpu_addr = info->cpu[cpu].address; |
| 431 | if (cpu_addr == boot_cpu_addr) |
| 432 | continue; |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 433 | if (!raw_cpu_stopped(cpu_addr)) { |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 434 | s_cpus++; |
| 435 | continue; |
| 436 | } |
| 437 | smp_get_save_area(c_cpus, cpu_addr); |
| 438 | c_cpus++; |
| 439 | } |
| 440 | out: |
| 441 | kfree(info); |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 442 | 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] | 443 | get_online_cpus(); |
Heiko Carstens | 1e48951 | 2008-04-30 13:38:37 +0200 | [diff] [blame] | 444 | __smp_rescan_cpus(); |
Martin Schwidefsky | 9d40d2e | 2008-01-26 14:11:31 +0100 | [diff] [blame] | 445 | put_online_cpus(); |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 446 | } |
| 447 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | /* |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 449 | * Activate a secondary processor. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 450 | */ |
Heiko Carstens | ea1f4ee | 2007-05-31 17:38:05 +0200 | [diff] [blame] | 451 | int __cpuinit start_secondary(void *cpuvoid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 453 | /* Setup the cpu */ |
| 454 | cpu_init(); |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 455 | preempt_disable(); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 456 | /* Enable TOD clock interrupts on the secondary cpu. */ |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 457 | init_cpu_timer(); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 458 | /* Enable cpu timer interrupts on the secondary cpu. */ |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 459 | init_cpu_vtimer(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | /* Enable pfault pseudo page faults on this cpu. */ |
Heiko Carstens | 29b08d2 | 2006-12-04 15:40:40 +0100 | [diff] [blame] | 461 | pfault_init(); |
| 462 | |
Manfred Spraul | e545a61 | 2008-09-07 16:57:22 +0200 | [diff] [blame] | 463 | /* call cpu notifiers */ |
| 464 | notify_cpu_starting(smp_processor_id()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | /* Mark this cpu as online */ |
Heiko Carstens | ca9fc75 | 2008-12-25 13:38:39 +0100 | [diff] [blame] | 466 | ipi_call_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | cpu_set(smp_processor_id(), cpu_online_map); |
Heiko Carstens | ca9fc75 | 2008-12-25 13:38:39 +0100 | [diff] [blame] | 468 | ipi_call_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | /* Switch on interrupts */ |
| 470 | local_irq_enable(); |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 471 | /* Print info about this processor */ |
Martin Schwidefsky | 7b46848 | 2009-03-26 15:24:42 +0100 | [diff] [blame] | 472 | print_cpu_info(); |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 473 | /* cpu_idle will call schedule for us */ |
| 474 | cpu_idle(); |
| 475 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | } |
| 477 | |
| 478 | static void __init smp_create_idle(unsigned int cpu) |
| 479 | { |
| 480 | struct task_struct *p; |
| 481 | |
| 482 | /* |
| 483 | * don't care about the psw and regs settings since we'll never |
| 484 | * reschedule the forked task. |
| 485 | */ |
| 486 | p = fork_idle(cpu); |
| 487 | if (IS_ERR(p)) |
| 488 | panic("failed fork for CPU %u: %li", cpu, PTR_ERR(p)); |
| 489 | current_set[cpu] = p; |
| 490 | } |
| 491 | |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 492 | static int __cpuinit smp_alloc_lowcore(int cpu) |
| 493 | { |
| 494 | unsigned long async_stack, panic_stack; |
| 495 | struct _lowcore *lowcore; |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 496 | |
Heiko Carstens | 3fd26a7 | 2009-09-22 22:58:49 +0200 | [diff] [blame] | 497 | lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, LC_ORDER); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 498 | if (!lowcore) |
| 499 | return -ENOMEM; |
| 500 | async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 501 | panic_stack = __get_free_page(GFP_KERNEL); |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 502 | if (!panic_stack || !async_stack) |
| 503 | goto out; |
Heiko Carstens | 98c7b38 | 2008-03-05 12:37:09 +0100 | [diff] [blame] | 504 | memcpy(lowcore, &S390_lowcore, 512); |
| 505 | memset((char *)lowcore + 512, 0, sizeof(*lowcore) - 512); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 506 | lowcore->async_stack = async_stack + ASYNC_SIZE; |
| 507 | lowcore->panic_stack = panic_stack + PAGE_SIZE; |
| 508 | |
| 509 | #ifndef CONFIG_64BIT |
| 510 | if (MACHINE_HAS_IEEE) { |
| 511 | unsigned long save_area; |
| 512 | |
| 513 | save_area = get_zeroed_page(GFP_KERNEL); |
| 514 | if (!save_area) |
Martin Schwidefsky | 33b1d09 | 2008-12-25 13:39:27 +0100 | [diff] [blame] | 515 | goto out; |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 516 | lowcore->extended_save_area_addr = (u32) save_area; |
| 517 | } |
Martin Schwidefsky | c742b31 | 2008-12-31 15:11:42 +0100 | [diff] [blame] | 518 | #else |
| 519 | if (vdso_alloc_per_cpu(cpu, lowcore)) |
| 520 | goto out; |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 521 | #endif |
| 522 | lowcore_ptr[cpu] = lowcore; |
| 523 | return 0; |
| 524 | |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 525 | out: |
Martin Schwidefsky | 33b1d09 | 2008-12-25 13:39:27 +0100 | [diff] [blame] | 526 | free_page(panic_stack); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 527 | free_pages(async_stack, ASYNC_ORDER); |
Heiko Carstens | 3fd26a7 | 2009-09-22 22:58:49 +0200 | [diff] [blame] | 528 | free_pages((unsigned long) lowcore, LC_ORDER); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 529 | return -ENOMEM; |
| 530 | } |
| 531 | |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 532 | static void smp_free_lowcore(int cpu) |
| 533 | { |
| 534 | struct _lowcore *lowcore; |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 535 | |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 536 | lowcore = lowcore_ptr[cpu]; |
| 537 | #ifndef CONFIG_64BIT |
| 538 | if (MACHINE_HAS_IEEE) |
| 539 | free_page((unsigned long) lowcore->extended_save_area_addr); |
Martin Schwidefsky | c742b31 | 2008-12-31 15:11:42 +0100 | [diff] [blame] | 540 | #else |
| 541 | vdso_free_per_cpu(cpu, lowcore); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 542 | #endif |
| 543 | free_page(lowcore->panic_stack - PAGE_SIZE); |
| 544 | free_pages(lowcore->async_stack - ASYNC_SIZE, ASYNC_ORDER); |
Heiko Carstens | 3fd26a7 | 2009-09-22 22:58:49 +0200 | [diff] [blame] | 545 | free_pages((unsigned long) lowcore, LC_ORDER); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 546 | lowcore_ptr[cpu] = NULL; |
| 547 | } |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 548 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | /* Upping and downing of CPUs */ |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 550 | int __cpuinit __cpu_up(unsigned int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 551 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 552 | struct _lowcore *cpu_lowcore; |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 553 | struct task_struct *idle; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 554 | struct stack_frame *sf; |
Heiko Carstens | d0d3cdf | 2009-03-26 15:24:53 +0100 | [diff] [blame] | 555 | u32 lowcore; |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 556 | int ccode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 558 | if (smp_cpu_state[cpu] != CPU_STATE_CONFIGURED) |
| 559 | return -EIO; |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 560 | if (smp_alloc_lowcore(cpu)) |
| 561 | return -ENOMEM; |
Heiko Carstens | d0d3cdf | 2009-03-26 15:24:53 +0100 | [diff] [blame] | 562 | do { |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 563 | ccode = sigp(cpu, sigp_initial_cpu_reset); |
Heiko Carstens | d0d3cdf | 2009-03-26 15:24:53 +0100 | [diff] [blame] | 564 | if (ccode == sigp_busy) |
| 565 | udelay(10); |
| 566 | if (ccode == sigp_not_operational) |
| 567 | goto err_out; |
| 568 | } while (ccode == sigp_busy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | |
Heiko Carstens | d0d3cdf | 2009-03-26 15:24:53 +0100 | [diff] [blame] | 570 | lowcore = (u32)(unsigned long)lowcore_ptr[cpu]; |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 571 | while (sigp_p(lowcore, cpu, sigp_set_prefix) == sigp_busy) |
Heiko Carstens | d0d3cdf | 2009-03-26 15:24:53 +0100 | [diff] [blame] | 572 | udelay(10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | |
| 574 | idle = current_set[cpu]; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 575 | cpu_lowcore = lowcore_ptr[cpu]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | cpu_lowcore->kernel_stack = (unsigned long) |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 577 | task_stack_page(idle) + THREAD_SIZE; |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 578 | cpu_lowcore->thread_info = (unsigned long) task_thread_info(idle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 579 | sf = (struct stack_frame *) (cpu_lowcore->kernel_stack |
| 580 | - sizeof(struct pt_regs) |
| 581 | - sizeof(struct stack_frame)); |
| 582 | memset(sf, 0, sizeof(struct stack_frame)); |
| 583 | sf->gprs[9] = (unsigned long) sf; |
| 584 | cpu_lowcore->save_area[15] = (unsigned long) sf; |
Segher Boessenkool | 24d3e21 | 2008-06-10 10:03:23 +0200 | [diff] [blame] | 585 | __ctl_store(cpu_lowcore->cregs_save_area, 0, 15); |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 586 | asm volatile( |
| 587 | " stam 0,15,0(%0)" |
| 588 | : : "a" (&cpu_lowcore->access_regs_save_area) : "memory"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | cpu_lowcore->percpu_offset = __per_cpu_offset[cpu]; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 590 | cpu_lowcore->current_task = (unsigned long) idle; |
Martin Schwidefsky | 7b46848 | 2009-03-26 15:24:42 +0100 | [diff] [blame] | 591 | cpu_lowcore->cpu_nr = cpu; |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 592 | cpu_lowcore->kernel_asce = S390_lowcore.kernel_asce; |
Christian Ehrhardt | 25097bf | 2009-04-14 15:36:16 +0200 | [diff] [blame] | 593 | cpu_lowcore->machine_flags = S390_lowcore.machine_flags; |
Heiko Carstens | dfd9f7a | 2009-06-12 10:26:44 +0200 | [diff] [blame] | 594 | cpu_lowcore->ftrace_func = S390_lowcore.ftrace_func; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 595 | eieio(); |
Michael Ryan | 699ff13 | 2006-03-24 03:15:17 -0800 | [diff] [blame] | 596 | |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 597 | while (sigp(cpu, sigp_restart) == sigp_busy) |
Michael Ryan | 699ff13 | 2006-03-24 03:15:17 -0800 | [diff] [blame] | 598 | udelay(10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | |
| 600 | while (!cpu_online(cpu)) |
| 601 | cpu_relax(); |
| 602 | return 0; |
Heiko Carstens | d0d3cdf | 2009-03-26 15:24:53 +0100 | [diff] [blame] | 603 | |
| 604 | err_out: |
| 605 | smp_free_lowcore(cpu); |
| 606 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | } |
| 608 | |
Heiko Carstens | 37a3302 | 2006-02-17 13:52:47 -0800 | [diff] [blame] | 609 | static int __init setup_possible_cpus(char *s) |
| 610 | { |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 611 | int pcpus, cpu; |
| 612 | |
| 613 | pcpus = simple_strtoul(s, NULL, 0); |
Heiko Carstens | 88e0128 | 2009-04-14 15:36:25 +0200 | [diff] [blame] | 614 | init_cpu_possible(cpumask_of(0)); |
| 615 | for (cpu = 1; cpu < pcpus && cpu < nr_cpu_ids; cpu++) |
Rusty Russell | def6cfb | 2009-03-26 15:25:00 +0100 | [diff] [blame] | 616 | set_cpu_possible(cpu, true); |
Heiko Carstens | 37a3302 | 2006-02-17 13:52:47 -0800 | [diff] [blame] | 617 | return 0; |
| 618 | } |
| 619 | early_param("possible_cpus", setup_possible_cpus); |
| 620 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 621 | #ifdef CONFIG_HOTPLUG_CPU |
| 622 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 623 | int __cpu_disable(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 624 | { |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 625 | struct ec_creg_mask_parms cr_parms; |
Zwane Mwaikambo | f370513 | 2005-06-25 14:54:50 -0700 | [diff] [blame] | 626 | int cpu = smp_processor_id(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | |
Zwane Mwaikambo | f370513 | 2005-06-25 14:54:50 -0700 | [diff] [blame] | 628 | cpu_clear(cpu, cpu_online_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 629 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 630 | /* Disable pfault pseudo page faults on this cpu. */ |
Heiko Carstens | 29b08d2 | 2006-12-04 15:40:40 +0100 | [diff] [blame] | 631 | pfault_fini(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 633 | memset(&cr_parms.orvals, 0, sizeof(cr_parms.orvals)); |
| 634 | memset(&cr_parms.andvals, 0xff, sizeof(cr_parms.andvals)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 635 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 636 | /* disable all external interrupts */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | cr_parms.orvals[0] = 0; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 638 | cr_parms.andvals[0] = ~(1 << 15 | 1 << 14 | 1 << 13 | 1 << 12 | |
| 639 | 1 << 11 | 1 << 10 | 1 << 6 | 1 << 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | /* disable all I/O interrupts */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | cr_parms.orvals[6] = 0; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 642 | cr_parms.andvals[6] = ~(1 << 31 | 1 << 30 | 1 << 29 | 1 << 28 | |
| 643 | 1 << 27 | 1 << 26 | 1 << 25 | 1 << 24); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 644 | /* disable most machine checks */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 645 | cr_parms.orvals[14] = 0; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 646 | cr_parms.andvals[14] = ~(1 << 28 | 1 << 27 | 1 << 26 | |
| 647 | 1 << 25 | 1 << 24); |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 648 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | smp_ctl_bit_callback(&cr_parms); |
| 650 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | return 0; |
| 652 | } |
| 653 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 654 | void __cpu_die(unsigned int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | { |
| 656 | /* Wait until target cpu is down */ |
Heiko Carstens | 5c0b912 | 2009-09-11 10:29:05 +0200 | [diff] [blame] | 657 | while (!cpu_stopped(cpu)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 658 | cpu_relax(); |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 659 | while (sigp_p(0, cpu, sigp_set_prefix) == sigp_busy) |
Heiko Carstens | 4f8048e | 2009-10-29 15:04:09 +0100 | [diff] [blame] | 660 | udelay(10); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 661 | smp_free_lowcore(cpu); |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 662 | pr_info("Processor %d stopped\n", cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 663 | } |
| 664 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 665 | void cpu_die(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 666 | { |
| 667 | idle_task_exit(); |
Heiko Carstens | a93b8ec | 2010-02-26 22:37:35 +0100 | [diff] [blame] | 668 | while (sigp(smp_processor_id(), sigp_stop) == sigp_busy) |
Heiko Carstens | f8501ba | 2009-10-29 15:04:13 +0100 | [diff] [blame] | 669 | cpu_relax(); |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 670 | for (;;); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | } |
| 672 | |
Heiko Carstens | 255acee | 2006-02-17 13:52:46 -0800 | [diff] [blame] | 673 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 674 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | void __init smp_prepare_cpus(unsigned int max_cpus) |
| 676 | { |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 677 | #ifndef CONFIG_64BIT |
| 678 | unsigned long save_area = 0; |
| 679 | #endif |
| 680 | unsigned long async_stack, panic_stack; |
| 681 | struct _lowcore *lowcore; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | unsigned int cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 683 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 684 | smp_detect_cpus(); |
| 685 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 686 | /* request the 0x1201 emergency signal external interrupt */ |
| 687 | if (register_external_interrupt(0x1201, do_ext_call_interrupt) != 0) |
| 688 | panic("Couldn't request external interrupt 0x1201"); |
Martin Schwidefsky | 7b46848 | 2009-03-26 15:24:42 +0100 | [diff] [blame] | 689 | print_cpu_info(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 691 | /* Reallocate current lowcore, but keep its contents. */ |
Heiko Carstens | 3fd26a7 | 2009-09-22 22:58:49 +0200 | [diff] [blame] | 692 | lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, LC_ORDER); |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 693 | panic_stack = __get_free_page(GFP_KERNEL); |
| 694 | async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER); |
Martin Schwidefsky | c742b31 | 2008-12-31 15:11:42 +0100 | [diff] [blame] | 695 | BUG_ON(!lowcore || !panic_stack || !async_stack); |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 696 | #ifndef CONFIG_64BIT |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 697 | if (MACHINE_HAS_IEEE) |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 698 | save_area = get_zeroed_page(GFP_KERNEL); |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 699 | #endif |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 700 | local_irq_disable(); |
| 701 | local_mcck_disable(); |
| 702 | lowcore_ptr[smp_processor_id()] = lowcore; |
| 703 | *lowcore = S390_lowcore; |
| 704 | lowcore->panic_stack = panic_stack + PAGE_SIZE; |
| 705 | lowcore->async_stack = async_stack + ASYNC_SIZE; |
| 706 | #ifndef CONFIG_64BIT |
| 707 | if (MACHINE_HAS_IEEE) |
| 708 | lowcore->extended_save_area_addr = (u32) save_area; |
| 709 | #endif |
| 710 | set_prefix((u32)(unsigned long) lowcore); |
| 711 | local_mcck_enable(); |
| 712 | local_irq_enable(); |
Heiko Carstens | 3a6ba46 | 2009-07-24 12:39:51 +0200 | [diff] [blame] | 713 | #ifdef CONFIG_64BIT |
| 714 | if (vdso_alloc_per_cpu(smp_processor_id(), &S390_lowcore)) |
| 715 | BUG(); |
| 716 | #endif |
KAMEZAWA Hiroyuki | 97db7fb | 2006-03-31 02:30:26 -0800 | [diff] [blame] | 717 | for_each_possible_cpu(cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | if (cpu != smp_processor_id()) |
| 719 | smp_create_idle(cpu); |
| 720 | } |
| 721 | |
Heiko Carstens | ea1f4ee | 2007-05-31 17:38:05 +0200 | [diff] [blame] | 722 | void __init smp_prepare_boot_cpu(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | { |
| 724 | BUG_ON(smp_processor_id() != 0); |
| 725 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 726 | current_thread_info()->cpu = 0; |
| 727 | cpu_set(0, cpu_present_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | cpu_set(0, cpu_online_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 729 | S390_lowcore.percpu_offset = __per_cpu_offset[0]; |
| 730 | current_set[0] = current; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 731 | smp_cpu_state[0] = CPU_STATE_CONFIGURED; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 732 | smp_cpu_polarization[0] = POLARIZATION_UNKNWN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | } |
| 734 | |
Heiko Carstens | ea1f4ee | 2007-05-31 17:38:05 +0200 | [diff] [blame] | 735 | void __init smp_cpus_done(unsigned int max_cpus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 736 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | } |
| 738 | |
Heiko Carstens | 02beacc | 2010-01-13 20:44:34 +0100 | [diff] [blame] | 739 | void __init smp_setup_processor_id(void) |
| 740 | { |
| 741 | S390_lowcore.cpu_nr = 0; |
| 742 | __cpu_logical_map[0] = stap(); |
| 743 | } |
| 744 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | /* |
| 746 | * the frequency of the profiling timer can be changed |
| 747 | * by writing a multiplier value into /proc/profile. |
| 748 | * |
| 749 | * usually you want to run this on all CPUs ;) |
| 750 | */ |
| 751 | int setup_profiling_timer(unsigned int multiplier) |
| 752 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 753 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | } |
| 755 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 756 | #ifdef CONFIG_HOTPLUG_CPU |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 757 | static ssize_t cpu_configure_show(struct sys_device *dev, |
| 758 | struct sysdev_attribute *attr, char *buf) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 759 | { |
| 760 | ssize_t count; |
| 761 | |
| 762 | mutex_lock(&smp_cpu_state_mutex); |
| 763 | count = sprintf(buf, "%d\n", smp_cpu_state[dev->id]); |
| 764 | mutex_unlock(&smp_cpu_state_mutex); |
| 765 | return count; |
| 766 | } |
| 767 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 768 | static ssize_t cpu_configure_store(struct sys_device *dev, |
| 769 | struct sysdev_attribute *attr, |
| 770 | const char *buf, size_t count) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 771 | { |
| 772 | int cpu = dev->id; |
| 773 | int val, rc; |
| 774 | char delim; |
| 775 | |
| 776 | if (sscanf(buf, "%d %c", &val, &delim) != 1) |
| 777 | return -EINVAL; |
| 778 | if (val != 0 && val != 1) |
| 779 | return -EINVAL; |
| 780 | |
Martin Schwidefsky | 9d40d2e | 2008-01-26 14:11:31 +0100 | [diff] [blame] | 781 | get_online_cpus(); |
Heiko Carstens | 0b18d31 | 2008-04-30 13:38:36 +0200 | [diff] [blame] | 782 | mutex_lock(&smp_cpu_state_mutex); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 783 | rc = -EBUSY; |
Heiko Carstens | 2c2df11 | 2010-02-26 22:37:34 +0100 | [diff] [blame] | 784 | /* disallow configuration changes of online cpus and cpu 0 */ |
| 785 | if (cpu_online(cpu) || cpu == 0) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 786 | goto out; |
| 787 | rc = 0; |
| 788 | switch (val) { |
| 789 | case 0: |
| 790 | if (smp_cpu_state[cpu] == CPU_STATE_CONFIGURED) { |
| 791 | rc = sclp_cpu_deconfigure(__cpu_logical_map[cpu]); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 792 | if (!rc) { |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 793 | smp_cpu_state[cpu] = CPU_STATE_STANDBY; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 794 | smp_cpu_polarization[cpu] = POLARIZATION_UNKNWN; |
| 795 | } |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 796 | } |
| 797 | break; |
| 798 | case 1: |
| 799 | if (smp_cpu_state[cpu] == CPU_STATE_STANDBY) { |
| 800 | rc = sclp_cpu_configure(__cpu_logical_map[cpu]); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 801 | if (!rc) { |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 802 | smp_cpu_state[cpu] = CPU_STATE_CONFIGURED; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 803 | smp_cpu_polarization[cpu] = POLARIZATION_UNKNWN; |
| 804 | } |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 805 | } |
| 806 | break; |
| 807 | default: |
| 808 | break; |
| 809 | } |
| 810 | out: |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 811 | mutex_unlock(&smp_cpu_state_mutex); |
Heiko Carstens | 0b18d31 | 2008-04-30 13:38:36 +0200 | [diff] [blame] | 812 | put_online_cpus(); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 813 | return rc ? rc : count; |
| 814 | } |
| 815 | static SYSDEV_ATTR(configure, 0644, cpu_configure_show, cpu_configure_store); |
| 816 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 817 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 818 | static ssize_t cpu_polarization_show(struct sys_device *dev, |
| 819 | struct sysdev_attribute *attr, char *buf) |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 820 | { |
| 821 | int cpu = dev->id; |
| 822 | ssize_t count; |
| 823 | |
| 824 | mutex_lock(&smp_cpu_state_mutex); |
| 825 | switch (smp_cpu_polarization[cpu]) { |
| 826 | case POLARIZATION_HRZ: |
| 827 | count = sprintf(buf, "horizontal\n"); |
| 828 | break; |
| 829 | case POLARIZATION_VL: |
| 830 | count = sprintf(buf, "vertical:low\n"); |
| 831 | break; |
| 832 | case POLARIZATION_VM: |
| 833 | count = sprintf(buf, "vertical:medium\n"); |
| 834 | break; |
| 835 | case POLARIZATION_VH: |
| 836 | count = sprintf(buf, "vertical:high\n"); |
| 837 | break; |
| 838 | default: |
| 839 | count = sprintf(buf, "unknown\n"); |
| 840 | break; |
| 841 | } |
| 842 | mutex_unlock(&smp_cpu_state_mutex); |
| 843 | return count; |
| 844 | } |
| 845 | static SYSDEV_ATTR(polarization, 0444, cpu_polarization_show, NULL); |
| 846 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 847 | static ssize_t show_cpu_address(struct sys_device *dev, |
| 848 | struct sysdev_attribute *attr, char *buf) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 849 | { |
| 850 | return sprintf(buf, "%d\n", __cpu_logical_map[dev->id]); |
| 851 | } |
| 852 | static SYSDEV_ATTR(address, 0444, show_cpu_address, NULL); |
| 853 | |
| 854 | |
| 855 | static struct attribute *cpu_common_attrs[] = { |
| 856 | #ifdef CONFIG_HOTPLUG_CPU |
| 857 | &attr_configure.attr, |
| 858 | #endif |
| 859 | &attr_address.attr, |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 860 | &attr_polarization.attr, |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 861 | NULL, |
| 862 | }; |
| 863 | |
| 864 | static struct attribute_group cpu_common_attr_group = { |
| 865 | .attrs = cpu_common_attrs, |
| 866 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 868 | static ssize_t show_capability(struct sys_device *dev, |
| 869 | struct sysdev_attribute *attr, char *buf) |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 870 | { |
| 871 | unsigned int capability; |
| 872 | int rc; |
| 873 | |
| 874 | rc = get_cpu_capability(&capability); |
| 875 | if (rc) |
| 876 | return rc; |
| 877 | return sprintf(buf, "%u\n", capability); |
| 878 | } |
| 879 | static SYSDEV_ATTR(capability, 0444, show_capability, NULL); |
| 880 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 881 | static ssize_t show_idle_count(struct sys_device *dev, |
| 882 | struct sysdev_attribute *attr, char *buf) |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 883 | { |
| 884 | struct s390_idle_data *idle; |
| 885 | unsigned long long idle_count; |
Martin Schwidefsky | e98bbaa | 2009-06-22 12:08:20 +0200 | [diff] [blame] | 886 | unsigned int sequence; |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 887 | |
| 888 | idle = &per_cpu(s390_idle, dev->id); |
Martin Schwidefsky | e98bbaa | 2009-06-22 12:08:20 +0200 | [diff] [blame] | 889 | repeat: |
| 890 | sequence = idle->sequence; |
| 891 | smp_rmb(); |
| 892 | if (sequence & 1) |
| 893 | goto repeat; |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 894 | idle_count = idle->idle_count; |
Martin Schwidefsky | 6f43092 | 2008-12-31 15:11:40 +0100 | [diff] [blame] | 895 | if (idle->idle_enter) |
| 896 | idle_count++; |
Martin Schwidefsky | e98bbaa | 2009-06-22 12:08:20 +0200 | [diff] [blame] | 897 | smp_rmb(); |
| 898 | if (idle->sequence != sequence) |
| 899 | goto repeat; |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 900 | return sprintf(buf, "%llu\n", idle_count); |
| 901 | } |
| 902 | static SYSDEV_ATTR(idle_count, 0444, show_idle_count, NULL); |
| 903 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 904 | static ssize_t show_idle_time(struct sys_device *dev, |
| 905 | struct sysdev_attribute *attr, char *buf) |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 906 | { |
| 907 | struct s390_idle_data *idle; |
Martin Schwidefsky | 6f43092 | 2008-12-31 15:11:40 +0100 | [diff] [blame] | 908 | unsigned long long now, idle_time, idle_enter; |
Martin Schwidefsky | e98bbaa | 2009-06-22 12:08:20 +0200 | [diff] [blame] | 909 | unsigned int sequence; |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 910 | |
| 911 | idle = &per_cpu(s390_idle, dev->id); |
Martin Schwidefsky | 6f43092 | 2008-12-31 15:11:40 +0100 | [diff] [blame] | 912 | now = get_clock(); |
Martin Schwidefsky | e98bbaa | 2009-06-22 12:08:20 +0200 | [diff] [blame] | 913 | repeat: |
| 914 | sequence = idle->sequence; |
| 915 | smp_rmb(); |
| 916 | if (sequence & 1) |
| 917 | goto repeat; |
Martin Schwidefsky | 6f43092 | 2008-12-31 15:11:40 +0100 | [diff] [blame] | 918 | idle_time = idle->idle_time; |
| 919 | idle_enter = idle->idle_enter; |
| 920 | if (idle_enter != 0ULL && idle_enter < now) |
| 921 | idle_time += now - idle_enter; |
Martin Schwidefsky | e98bbaa | 2009-06-22 12:08:20 +0200 | [diff] [blame] | 922 | smp_rmb(); |
| 923 | if (idle->sequence != sequence) |
| 924 | goto repeat; |
Martin Schwidefsky | 6f43092 | 2008-12-31 15:11:40 +0100 | [diff] [blame] | 925 | return sprintf(buf, "%llu\n", idle_time >> 12); |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 926 | } |
Heiko Carstens | 69d39d6 | 2007-11-05 11:10:13 +0100 | [diff] [blame] | 927 | static SYSDEV_ATTR(idle_time_us, 0444, show_idle_time, NULL); |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 928 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 929 | static struct attribute *cpu_online_attrs[] = { |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 930 | &attr_capability.attr, |
| 931 | &attr_idle_count.attr, |
Heiko Carstens | 69d39d6 | 2007-11-05 11:10:13 +0100 | [diff] [blame] | 932 | &attr_idle_time_us.attr, |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 933 | NULL, |
| 934 | }; |
| 935 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 936 | static struct attribute_group cpu_online_attr_group = { |
| 937 | .attrs = cpu_online_attrs, |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 938 | }; |
| 939 | |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 940 | static int __cpuinit smp_cpu_notify(struct notifier_block *self, |
| 941 | unsigned long action, void *hcpu) |
| 942 | { |
| 943 | unsigned int cpu = (unsigned int)(long)hcpu; |
| 944 | struct cpu *c = &per_cpu(cpu_devices, cpu); |
| 945 | struct sys_device *s = &c->sysdev; |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 946 | struct s390_idle_data *idle; |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 947 | |
| 948 | switch (action) { |
| 949 | case CPU_ONLINE: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 950 | case CPU_ONLINE_FROZEN: |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 951 | idle = &per_cpu(s390_idle, cpu); |
Martin Schwidefsky | e98bbaa | 2009-06-22 12:08:20 +0200 | [diff] [blame] | 952 | memset(idle, 0, sizeof(struct s390_idle_data)); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 953 | if (sysfs_create_group(&s->kobj, &cpu_online_attr_group)) |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 954 | return NOTIFY_BAD; |
| 955 | break; |
| 956 | case CPU_DEAD: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 957 | case CPU_DEAD_FROZEN: |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 958 | sysfs_remove_group(&s->kobj, &cpu_online_attr_group); |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 959 | break; |
| 960 | } |
| 961 | return NOTIFY_OK; |
| 962 | } |
| 963 | |
| 964 | static struct notifier_block __cpuinitdata smp_cpu_nb = { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 965 | .notifier_call = smp_cpu_notify, |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 966 | }; |
| 967 | |
Heiko Carstens | 2bc89b5 | 2008-02-05 16:50:40 +0100 | [diff] [blame] | 968 | static int __devinit smp_add_present_cpu(int cpu) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 969 | { |
| 970 | struct cpu *c = &per_cpu(cpu_devices, cpu); |
| 971 | struct sys_device *s = &c->sysdev; |
| 972 | int rc; |
| 973 | |
| 974 | c->hotpluggable = 1; |
| 975 | rc = register_cpu(c, cpu); |
| 976 | if (rc) |
| 977 | goto out; |
| 978 | rc = sysfs_create_group(&s->kobj, &cpu_common_attr_group); |
| 979 | if (rc) |
| 980 | goto out_cpu; |
| 981 | if (!cpu_online(cpu)) |
| 982 | goto out; |
| 983 | rc = sysfs_create_group(&s->kobj, &cpu_online_attr_group); |
| 984 | if (!rc) |
| 985 | return 0; |
| 986 | sysfs_remove_group(&s->kobj, &cpu_common_attr_group); |
| 987 | out_cpu: |
| 988 | #ifdef CONFIG_HOTPLUG_CPU |
| 989 | unregister_cpu(c); |
| 990 | #endif |
| 991 | out: |
| 992 | return rc; |
| 993 | } |
| 994 | |
| 995 | #ifdef CONFIG_HOTPLUG_CPU |
Heiko Carstens | 1e48951 | 2008-04-30 13:38:37 +0200 | [diff] [blame] | 996 | |
Heiko Carstens | 67060d9 | 2008-05-30 10:03:27 +0200 | [diff] [blame] | 997 | int __ref smp_rescan_cpus(void) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 998 | { |
| 999 | cpumask_t newcpus; |
| 1000 | int cpu; |
| 1001 | int rc; |
| 1002 | |
Martin Schwidefsky | 9d40d2e | 2008-01-26 14:11:31 +0100 | [diff] [blame] | 1003 | get_online_cpus(); |
Heiko Carstens | 0b18d31 | 2008-04-30 13:38:36 +0200 | [diff] [blame] | 1004 | mutex_lock(&smp_cpu_state_mutex); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1005 | newcpus = cpu_present_map; |
Heiko Carstens | 1e48951 | 2008-04-30 13:38:37 +0200 | [diff] [blame] | 1006 | rc = __smp_rescan_cpus(); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1007 | if (rc) |
| 1008 | goto out; |
| 1009 | cpus_andnot(newcpus, cpu_present_map, newcpus); |
| 1010 | for_each_cpu_mask(cpu, newcpus) { |
| 1011 | rc = smp_add_present_cpu(cpu); |
| 1012 | if (rc) |
| 1013 | cpu_clear(cpu, cpu_present_map); |
| 1014 | } |
| 1015 | rc = 0; |
| 1016 | out: |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1017 | mutex_unlock(&smp_cpu_state_mutex); |
Heiko Carstens | 0b18d31 | 2008-04-30 13:38:36 +0200 | [diff] [blame] | 1018 | put_online_cpus(); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1019 | if (!cpus_empty(newcpus)) |
| 1020 | topology_schedule_update(); |
Heiko Carstens | 1e48951 | 2008-04-30 13:38:37 +0200 | [diff] [blame] | 1021 | return rc; |
| 1022 | } |
| 1023 | |
Andi Kleen | c9be0a3 | 2010-01-05 12:47:58 +0100 | [diff] [blame] | 1024 | static ssize_t __ref rescan_store(struct sysdev_class *class, |
| 1025 | struct sysdev_class_attribute *attr, |
| 1026 | const char *buf, |
Heiko Carstens | 1e48951 | 2008-04-30 13:38:37 +0200 | [diff] [blame] | 1027 | size_t count) |
| 1028 | { |
| 1029 | int rc; |
| 1030 | |
| 1031 | rc = smp_rescan_cpus(); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1032 | return rc ? rc : count; |
| 1033 | } |
Heiko Carstens | da5aae7 | 2008-10-28 11:10:16 +0100 | [diff] [blame] | 1034 | static SYSDEV_CLASS_ATTR(rescan, 0200, NULL, rescan_store); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1035 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 1036 | |
Heiko Carstens | 5fbcae5 | 2010-02-12 11:19:24 +0100 | [diff] [blame] | 1037 | static ssize_t dispatching_show(struct sysdev_class *class, |
| 1038 | struct sysdev_class_attribute *attr, |
| 1039 | char *buf) |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1040 | { |
| 1041 | ssize_t count; |
| 1042 | |
| 1043 | mutex_lock(&smp_cpu_state_mutex); |
| 1044 | count = sprintf(buf, "%d\n", cpu_management); |
| 1045 | mutex_unlock(&smp_cpu_state_mutex); |
| 1046 | return count; |
| 1047 | } |
| 1048 | |
Andi Kleen | c9be0a3 | 2010-01-05 12:47:58 +0100 | [diff] [blame] | 1049 | static ssize_t dispatching_store(struct sysdev_class *dev, |
| 1050 | struct sysdev_class_attribute *attr, |
| 1051 | const char *buf, |
Heiko Carstens | da5aae7 | 2008-10-28 11:10:16 +0100 | [diff] [blame] | 1052 | size_t count) |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1053 | { |
| 1054 | int val, rc; |
| 1055 | char delim; |
| 1056 | |
| 1057 | if (sscanf(buf, "%d %c", &val, &delim) != 1) |
| 1058 | return -EINVAL; |
| 1059 | if (val != 0 && val != 1) |
| 1060 | return -EINVAL; |
| 1061 | rc = 0; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1062 | get_online_cpus(); |
Heiko Carstens | 0b18d31 | 2008-04-30 13:38:36 +0200 | [diff] [blame] | 1063 | mutex_lock(&smp_cpu_state_mutex); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1064 | if (cpu_management == val) |
| 1065 | goto out; |
| 1066 | rc = topology_set_cpu_management(val); |
| 1067 | if (!rc) |
| 1068 | cpu_management = val; |
| 1069 | out: |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1070 | mutex_unlock(&smp_cpu_state_mutex); |
Heiko Carstens | 0b18d31 | 2008-04-30 13:38:36 +0200 | [diff] [blame] | 1071 | put_online_cpus(); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1072 | return rc ? rc : count; |
| 1073 | } |
Heiko Carstens | da5aae7 | 2008-10-28 11:10:16 +0100 | [diff] [blame] | 1074 | static SYSDEV_CLASS_ATTR(dispatching, 0644, dispatching_show, |
| 1075 | dispatching_store); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1076 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1077 | static int __init topology_init(void) |
| 1078 | { |
| 1079 | int cpu; |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 1080 | int rc; |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 1081 | |
| 1082 | register_cpu_notifier(&smp_cpu_nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1083 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1084 | #ifdef CONFIG_HOTPLUG_CPU |
Heiko Carstens | da5aae7 | 2008-10-28 11:10:16 +0100 | [diff] [blame] | 1085 | rc = sysdev_class_create_file(&cpu_sysdev_class, &attr_rescan); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1086 | if (rc) |
| 1087 | return rc; |
| 1088 | #endif |
Heiko Carstens | da5aae7 | 2008-10-28 11:10:16 +0100 | [diff] [blame] | 1089 | rc = sysdev_class_create_file(&cpu_sysdev_class, &attr_dispatching); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1090 | if (rc) |
| 1091 | return rc; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1092 | for_each_present_cpu(cpu) { |
| 1093 | rc = smp_add_present_cpu(cpu); |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 1094 | if (rc) |
| 1095 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1096 | } |
| 1097 | return 0; |
| 1098 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | subsys_initcall(topology_init); |