Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * arch/s390/kernel/smp.c |
| 3 | * |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 4 | * Copyright IBM Corp. 1999,2007 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * Author(s): Denis Joseph Barrow (djbarrow@de.ibm.com,barrow_dj@yahoo.com), |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 6 | * Martin Schwidefsky (schwidefsky@de.ibm.com) |
| 7 | * Heiko Carstens (heiko.carstens@de.ibm.com) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 9 | * based on other smp stuff by |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | * (c) 1995 Alan Cox, CymruNET Ltd <alan@cymru.net> |
| 11 | * (c) 1998 Ingo Molnar |
| 12 | * |
| 13 | * We work with logical cpu numbering everywhere we can. The only |
| 14 | * functions using the real cpu address (got from STAP) are the sigp |
| 15 | * functions. For all other functions we use the identity mapping. |
| 16 | * That means that cpu_number_map[i] == i for every cpu. cpu_number_map is |
| 17 | * used e.g. to find the idle task belonging to a logical cpu. Every array |
| 18 | * in the kernel is sorted by the logical cpu number and not by the physical |
| 19 | * one which is causing all the confusion with __cpu_logical_map and |
| 20 | * cpu_number_map in other architectures. |
| 21 | */ |
| 22 | |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 23 | #define KMSG_COMPONENT "cpu" |
| 24 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt |
| 25 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/module.h> |
| 27 | #include <linux/init.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include <linux/mm.h> |
Alexey Dobriyan | 4e950f6 | 2007-07-30 02:36:13 +0400 | [diff] [blame] | 29 | #include <linux/err.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | #include <linux/spinlock.h> |
| 31 | #include <linux/kernel_stat.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include <linux/delay.h> |
| 33 | #include <linux/cache.h> |
| 34 | #include <linux/interrupt.h> |
Christian Borntraeger | 3324e60 | 2009-03-26 15:23:56 +0100 | [diff] [blame] | 35 | #include <linux/irqflags.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include <linux/cpu.h> |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 37 | #include <linux/timex.h> |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 38 | #include <linux/bootmem.h> |
Michael Holzheu | 46b05d2 | 2007-02-21 10:55:21 +0100 | [diff] [blame] | 39 | #include <asm/ipl.h> |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 40 | #include <asm/setup.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | #include <asm/sigp.h> |
| 42 | #include <asm/pgalloc.h> |
| 43 | #include <asm/irq.h> |
| 44 | #include <asm/s390_ext.h> |
| 45 | #include <asm/cpcmd.h> |
| 46 | #include <asm/tlbflush.h> |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 47 | #include <asm/timer.h> |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 48 | #include <asm/lowcore.h> |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 49 | #include <asm/sclp.h> |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 50 | #include <asm/cpu.h> |
Martin Schwidefsky | c742b31 | 2008-12-31 15:11:42 +0100 | [diff] [blame] | 51 | #include <asm/vdso.h> |
Heiko Carstens | a806170 | 2008-04-17 07:46:26 +0200 | [diff] [blame] | 52 | #include "entry.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | static struct task_struct *current_set[NR_CPUS]; |
| 55 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 56 | static u8 smp_cpu_type; |
| 57 | static int smp_use_sigp_detection; |
| 58 | |
| 59 | enum s390_cpu_state { |
| 60 | CPU_STATE_STANDBY, |
| 61 | CPU_STATE_CONFIGURED, |
| 62 | }; |
| 63 | |
Heiko Carstens | dbd70fb | 2008-04-17 07:46:12 +0200 | [diff] [blame] | 64 | DEFINE_MUTEX(smp_cpu_state_mutex); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 65 | int smp_cpu_polarization[NR_CPUS]; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 66 | static int smp_cpu_state[NR_CPUS]; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 67 | static int cpu_management; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 68 | |
| 69 | static DEFINE_PER_CPU(struct cpu, cpu_devices); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 70 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | static void smp_ext_bitcall(int, ec_bit_sig); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 72 | |
Heiko Carstens | 677d762 | 2007-11-20 11:13:37 +0100 | [diff] [blame] | 73 | void smp_send_stop(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 75 | int cpu, rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
Heiko Carstens | 677d762 | 2007-11-20 11:13:37 +0100 | [diff] [blame] | 77 | /* Disable all interrupts/machine checks */ |
| 78 | __load_psw_mask(psw_kernel_bits & ~PSW_MASK_MCHECK); |
Christian Borntraeger | 3324e60 | 2009-03-26 15:23:56 +0100 | [diff] [blame] | 79 | trace_hardirqs_off(); |
Heiko Carstens | 677d762 | 2007-11-20 11:13:37 +0100 | [diff] [blame] | 80 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 81 | /* stop all processors */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | for_each_online_cpu(cpu) { |
| 83 | if (cpu == smp_processor_id()) |
| 84 | continue; |
| 85 | do { |
| 86 | rc = signal_processor(cpu, sigp_stop); |
| 87 | } while (rc == sigp_busy); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 88 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 89 | while (!smp_cpu_not_running(cpu)) |
Heiko Carstens | c6b5b84 | 2006-12-04 15:40:33 +0100 | [diff] [blame] | 90 | cpu_relax(); |
| 91 | } |
| 92 | } |
| 93 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 95 | * This is the main routine where commands issued by other |
| 96 | * cpus are handled. |
| 97 | */ |
| 98 | |
Heiko Carstens | 2b67fc4 | 2007-02-05 21:16:47 +0100 | [diff] [blame] | 99 | static void do_ext_call_interrupt(__u16 code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 100 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 101 | unsigned long bits; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 103 | /* |
| 104 | * handle bit signal external calls |
| 105 | * |
| 106 | * For the ec_schedule signal we have to do nothing. All the work |
| 107 | * is done automatically when we return from the interrupt. |
| 108 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | bits = xchg(&S390_lowcore.ext_call_fast, 0); |
| 110 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 111 | if (test_bit(ec_call_function, &bits)) |
Heiko Carstens | ca9fc75 | 2008-12-25 13:38:39 +0100 | [diff] [blame] | 112 | generic_smp_call_function_interrupt(); |
| 113 | |
| 114 | if (test_bit(ec_call_function_single, &bits)) |
| 115 | generic_smp_call_function_single_interrupt(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 116 | } |
| 117 | |
| 118 | /* |
| 119 | * Send an external call sigp to another cpu and return without waiting |
| 120 | * for its completion. |
| 121 | */ |
| 122 | static void smp_ext_bitcall(int cpu, ec_bit_sig sig) |
| 123 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 124 | /* |
| 125 | * Set signaling bit in lowcore of target cpu and kick it |
| 126 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | set_bit(sig, (unsigned long *) &lowcore_ptr[cpu]->ext_call_fast); |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 128 | while (signal_processor(cpu, sigp_emergency_signal) == sigp_busy) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | udelay(10); |
| 130 | } |
| 131 | |
Heiko Carstens | ca9fc75 | 2008-12-25 13:38:39 +0100 | [diff] [blame] | 132 | void arch_send_call_function_ipi(cpumask_t mask) |
| 133 | { |
| 134 | int cpu; |
| 135 | |
| 136 | for_each_cpu_mask(cpu, mask) |
| 137 | smp_ext_bitcall(cpu, ec_call_function); |
| 138 | } |
| 139 | |
| 140 | void arch_send_call_function_single_ipi(int cpu) |
| 141 | { |
| 142 | smp_ext_bitcall(cpu, ec_call_function_single); |
| 143 | } |
| 144 | |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 145 | #ifndef CONFIG_64BIT |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | /* |
| 147 | * this function sends a 'purge tlb' signal to another CPU. |
| 148 | */ |
Heiko Carstens | a806170 | 2008-04-17 07:46:26 +0200 | [diff] [blame] | 149 | static void smp_ptlb_callback(void *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | { |
Martin Schwidefsky | ba8a922 | 2007-10-22 12:52:44 +0200 | [diff] [blame] | 151 | __tlb_flush_local(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | } |
| 153 | |
| 154 | void smp_ptlb_all(void) |
| 155 | { |
Jens Axboe | 15c8b6c | 2008-05-09 09:39:44 +0200 | [diff] [blame] | 156 | on_each_cpu(smp_ptlb_callback, NULL, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 157 | } |
| 158 | EXPORT_SYMBOL(smp_ptlb_all); |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 159 | #endif /* ! CONFIG_64BIT */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | |
| 161 | /* |
| 162 | * this function sends a 'reschedule' IPI to another CPU. |
| 163 | * it goes straight through and wastes no time serializing |
| 164 | * anything. Worst case is that we lose a reschedule ... |
| 165 | */ |
| 166 | void smp_send_reschedule(int cpu) |
| 167 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 168 | smp_ext_bitcall(cpu, ec_schedule); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 169 | } |
| 170 | |
| 171 | /* |
| 172 | * parameter area for the set/clear control bit callbacks |
| 173 | */ |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 174 | struct ec_creg_mask_parms { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | unsigned long orvals[16]; |
| 176 | unsigned long andvals[16]; |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 177 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | |
| 179 | /* |
| 180 | * callback for setting/clearing control bits |
| 181 | */ |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 182 | static void smp_ctl_bit_callback(void *info) |
| 183 | { |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 184 | struct ec_creg_mask_parms *pp = info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | unsigned long cregs[16]; |
| 186 | int i; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 187 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 188 | __ctl_store(cregs, 0, 15); |
| 189 | for (i = 0; i <= 15; i++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | cregs[i] = (cregs[i] & pp->andvals[i]) | pp->orvals[i]; |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 191 | __ctl_load(cregs, 0, 15); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | } |
| 193 | |
| 194 | /* |
| 195 | * Set a bit in a control register of all cpus |
| 196 | */ |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 197 | void smp_ctl_set_bit(int cr, int bit) |
| 198 | { |
| 199 | struct ec_creg_mask_parms parms; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 201 | memset(&parms.orvals, 0, sizeof(parms.orvals)); |
| 202 | memset(&parms.andvals, 0xff, sizeof(parms.andvals)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | parms.orvals[cr] = 1 << bit; |
Jens Axboe | 15c8b6c | 2008-05-09 09:39:44 +0200 | [diff] [blame] | 204 | on_each_cpu(smp_ctl_bit_callback, &parms, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 205 | } |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 206 | EXPORT_SYMBOL(smp_ctl_set_bit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | |
| 208 | /* |
| 209 | * Clear a bit in a control register of all cpus |
| 210 | */ |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 211 | void smp_ctl_clear_bit(int cr, int bit) |
| 212 | { |
| 213 | struct ec_creg_mask_parms parms; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 215 | memset(&parms.orvals, 0, sizeof(parms.orvals)); |
| 216 | memset(&parms.andvals, 0xff, sizeof(parms.andvals)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 217 | parms.andvals[cr] = ~(1L << bit); |
Jens Axboe | 15c8b6c | 2008-05-09 09:39:44 +0200 | [diff] [blame] | 218 | on_each_cpu(smp_ctl_bit_callback, &parms, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 219 | } |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 220 | EXPORT_SYMBOL(smp_ctl_clear_bit); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 222 | /* |
| 223 | * In early ipl state a temp. logically cpu number is needed, so the sigp |
| 224 | * functions can be used to sense other cpus. Since NR_CPUS is >= 2 on |
| 225 | * CONFIG_SMP and the ipl cpu is logical cpu 0, it must be 1. |
| 226 | */ |
| 227 | #define CPU_INIT_NO 1 |
| 228 | |
Michael Holzheu | 59f2e69 | 2009-03-26 15:24:46 +0100 | [diff] [blame^] | 229 | #ifdef CONFIG_ZFCPDUMP |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 230 | |
| 231 | /* |
| 232 | * zfcpdump_prefix_array holds prefix registers for the following scenario: |
| 233 | * 64 bit zfcpdump kernel and 31 bit kernel which is to be dumped. We have to |
| 234 | * save its prefix registers, since they get lost, when switching from 31 bit |
| 235 | * to 64 bit. |
| 236 | */ |
| 237 | unsigned int zfcpdump_prefix_array[NR_CPUS + 1] \ |
| 238 | __attribute__((__section__(".data"))); |
| 239 | |
Heiko Carstens | 285f672 | 2007-07-10 11:24:13 +0200 | [diff] [blame] | 240 | 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] | 241 | { |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 242 | if (ipl_info.type != IPL_TYPE_FCP_DUMP) |
| 243 | return; |
Heiko Carstens | 285f672 | 2007-07-10 11:24:13 +0200 | [diff] [blame] | 244 | if (cpu >= NR_CPUS) { |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 245 | pr_warning("CPU %i exceeds the maximum %i and is excluded from " |
| 246 | "the dump\n", cpu, NR_CPUS - 1); |
Heiko Carstens | 285f672 | 2007-07-10 11:24:13 +0200 | [diff] [blame] | 247 | return; |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 248 | } |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 249 | zfcpdump_save_areas[cpu] = kmalloc(sizeof(union save_area), GFP_KERNEL); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 250 | __cpu_logical_map[CPU_INIT_NO] = (__u16) phy_cpu; |
| 251 | while (signal_processor(CPU_INIT_NO, sigp_stop_and_store_status) == |
| 252 | sigp_busy) |
Heiko Carstens | 285f672 | 2007-07-10 11:24:13 +0200 | [diff] [blame] | 253 | cpu_relax(); |
| 254 | memcpy(zfcpdump_save_areas[cpu], |
| 255 | (void *)(unsigned long) store_prefix() + SAVE_AREA_BASE, |
| 256 | SAVE_AREA_SIZE); |
| 257 | #ifdef CONFIG_64BIT |
| 258 | /* copy original prefix register */ |
| 259 | zfcpdump_save_areas[cpu]->s390x.pref_reg = zfcpdump_prefix_array[cpu]; |
| 260 | #endif |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 261 | } |
| 262 | |
| 263 | union save_area *zfcpdump_save_areas[NR_CPUS + 1]; |
| 264 | EXPORT_SYMBOL_GPL(zfcpdump_save_areas); |
| 265 | |
| 266 | #else |
Heiko Carstens | 285f672 | 2007-07-10 11:24:13 +0200 | [diff] [blame] | 267 | |
| 268 | static inline void smp_get_save_area(unsigned int cpu, unsigned int phy_cpu) { } |
| 269 | |
Michael Holzheu | 59f2e69 | 2009-03-26 15:24:46 +0100 | [diff] [blame^] | 270 | #endif /* CONFIG_ZFCPDUMP */ |
Michael Holzheu | 411ed32 | 2007-04-27 16:01:49 +0200 | [diff] [blame] | 271 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 272 | static int cpu_stopped(int cpu) |
| 273 | { |
| 274 | __u32 status; |
| 275 | |
| 276 | /* Check for stopped state */ |
| 277 | if (signal_processor_ps(&status, 0, cpu, sigp_sense) == |
| 278 | sigp_status_stored) { |
| 279 | if (status & 0x40) |
| 280 | return 1; |
| 281 | } |
| 282 | return 0; |
| 283 | } |
| 284 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 285 | static int cpu_known(int cpu_id) |
| 286 | { |
| 287 | int cpu; |
| 288 | |
| 289 | for_each_present_cpu(cpu) { |
| 290 | if (__cpu_logical_map[cpu] == cpu_id) |
| 291 | return 1; |
| 292 | } |
| 293 | return 0; |
| 294 | } |
| 295 | |
| 296 | static int smp_rescan_cpus_sigp(cpumask_t avail) |
| 297 | { |
| 298 | int cpu_id, logical_cpu; |
| 299 | |
| 300 | logical_cpu = first_cpu(avail); |
| 301 | if (logical_cpu == NR_CPUS) |
| 302 | return 0; |
| 303 | for (cpu_id = 0; cpu_id <= 65535; cpu_id++) { |
| 304 | if (cpu_known(cpu_id)) |
| 305 | continue; |
| 306 | __cpu_logical_map[logical_cpu] = cpu_id; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 307 | smp_cpu_polarization[logical_cpu] = POLARIZATION_UNKNWN; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 308 | if (!cpu_stopped(logical_cpu)) |
| 309 | continue; |
| 310 | cpu_set(logical_cpu, cpu_present_map); |
| 311 | smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED; |
| 312 | logical_cpu = next_cpu(logical_cpu, avail); |
| 313 | if (logical_cpu == NR_CPUS) |
| 314 | break; |
| 315 | } |
| 316 | return 0; |
| 317 | } |
| 318 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 319 | static int smp_rescan_cpus_sclp(cpumask_t avail) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 320 | { |
| 321 | struct sclp_cpu_info *info; |
| 322 | int cpu_id, logical_cpu, cpu; |
| 323 | int rc; |
| 324 | |
| 325 | logical_cpu = first_cpu(avail); |
| 326 | if (logical_cpu == NR_CPUS) |
| 327 | return 0; |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 328 | info = kmalloc(sizeof(*info), GFP_KERNEL); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 329 | if (!info) |
| 330 | return -ENOMEM; |
| 331 | rc = sclp_get_cpu_info(info); |
| 332 | if (rc) |
| 333 | goto out; |
| 334 | for (cpu = 0; cpu < info->combined; cpu++) { |
| 335 | if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type) |
| 336 | continue; |
| 337 | cpu_id = info->cpu[cpu].address; |
| 338 | if (cpu_known(cpu_id)) |
| 339 | continue; |
| 340 | __cpu_logical_map[logical_cpu] = cpu_id; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 341 | smp_cpu_polarization[logical_cpu] = POLARIZATION_UNKNWN; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 342 | cpu_set(logical_cpu, cpu_present_map); |
| 343 | if (cpu >= info->configured) |
| 344 | smp_cpu_state[logical_cpu] = CPU_STATE_STANDBY; |
| 345 | else |
| 346 | smp_cpu_state[logical_cpu] = CPU_STATE_CONFIGURED; |
| 347 | logical_cpu = next_cpu(logical_cpu, avail); |
| 348 | if (logical_cpu == NR_CPUS) |
| 349 | break; |
| 350 | } |
| 351 | out: |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 352 | kfree(info); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 353 | return rc; |
| 354 | } |
| 355 | |
Heiko Carstens | 1e48951 | 2008-04-30 13:38:37 +0200 | [diff] [blame] | 356 | static int __smp_rescan_cpus(void) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 357 | { |
| 358 | cpumask_t avail; |
| 359 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 360 | cpus_xor(avail, cpu_possible_map, cpu_present_map); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 361 | if (smp_use_sigp_detection) |
| 362 | return smp_rescan_cpus_sigp(avail); |
| 363 | else |
| 364 | return smp_rescan_cpus_sclp(avail); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | } |
| 366 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 367 | static void __init smp_detect_cpus(void) |
| 368 | { |
| 369 | unsigned int cpu, c_cpus, s_cpus; |
| 370 | struct sclp_cpu_info *info; |
| 371 | u16 boot_cpu_addr, cpu_addr; |
| 372 | |
| 373 | c_cpus = 1; |
| 374 | s_cpus = 0; |
Martin Schwidefsky | 7b46848 | 2009-03-26 15:24:42 +0100 | [diff] [blame] | 375 | boot_cpu_addr = __cpu_logical_map[0]; |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 376 | info = kmalloc(sizeof(*info), GFP_KERNEL); |
| 377 | if (!info) |
| 378 | panic("smp_detect_cpus failed to allocate memory\n"); |
| 379 | /* Use sigp detection algorithm if sclp doesn't work. */ |
| 380 | if (sclp_get_cpu_info(info)) { |
| 381 | smp_use_sigp_detection = 1; |
| 382 | for (cpu = 0; cpu <= 65535; cpu++) { |
| 383 | if (cpu == boot_cpu_addr) |
| 384 | continue; |
| 385 | __cpu_logical_map[CPU_INIT_NO] = cpu; |
| 386 | if (!cpu_stopped(CPU_INIT_NO)) |
| 387 | continue; |
| 388 | smp_get_save_area(c_cpus, cpu); |
| 389 | c_cpus++; |
| 390 | } |
| 391 | goto out; |
| 392 | } |
| 393 | |
| 394 | if (info->has_cpu_type) { |
| 395 | for (cpu = 0; cpu < info->combined; cpu++) { |
| 396 | if (info->cpu[cpu].address == boot_cpu_addr) { |
| 397 | smp_cpu_type = info->cpu[cpu].type; |
| 398 | break; |
| 399 | } |
| 400 | } |
| 401 | } |
| 402 | |
| 403 | for (cpu = 0; cpu < info->combined; cpu++) { |
| 404 | if (info->has_cpu_type && info->cpu[cpu].type != smp_cpu_type) |
| 405 | continue; |
| 406 | cpu_addr = info->cpu[cpu].address; |
| 407 | if (cpu_addr == boot_cpu_addr) |
| 408 | continue; |
| 409 | __cpu_logical_map[CPU_INIT_NO] = cpu_addr; |
| 410 | if (!cpu_stopped(CPU_INIT_NO)) { |
| 411 | s_cpus++; |
| 412 | continue; |
| 413 | } |
| 414 | smp_get_save_area(c_cpus, cpu_addr); |
| 415 | c_cpus++; |
| 416 | } |
| 417 | out: |
| 418 | kfree(info); |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 419 | 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] | 420 | get_online_cpus(); |
Heiko Carstens | 1e48951 | 2008-04-30 13:38:37 +0200 | [diff] [blame] | 421 | __smp_rescan_cpus(); |
Martin Schwidefsky | 9d40d2e | 2008-01-26 14:11:31 +0100 | [diff] [blame] | 422 | put_online_cpus(); |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 423 | } |
| 424 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | /* |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 426 | * Activate a secondary processor. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | */ |
Heiko Carstens | ea1f4ee | 2007-05-31 17:38:05 +0200 | [diff] [blame] | 428 | int __cpuinit start_secondary(void *cpuvoid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 430 | /* Setup the cpu */ |
| 431 | cpu_init(); |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 432 | preempt_disable(); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 433 | /* Enable TOD clock interrupts on the secondary cpu. */ |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 434 | init_cpu_timer(); |
Martin Schwidefsky | d54853e | 2007-02-05 21:18:19 +0100 | [diff] [blame] | 435 | /* Enable cpu timer interrupts on the secondary cpu. */ |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 436 | init_cpu_vtimer(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | /* Enable pfault pseudo page faults on this cpu. */ |
Heiko Carstens | 29b08d2 | 2006-12-04 15:40:40 +0100 | [diff] [blame] | 438 | pfault_init(); |
| 439 | |
Manfred Spraul | e545a61 | 2008-09-07 16:57:22 +0200 | [diff] [blame] | 440 | /* call cpu notifiers */ |
| 441 | notify_cpu_starting(smp_processor_id()); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | /* Mark this cpu as online */ |
Heiko Carstens | ca9fc75 | 2008-12-25 13:38:39 +0100 | [diff] [blame] | 443 | ipi_call_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | cpu_set(smp_processor_id(), cpu_online_map); |
Heiko Carstens | ca9fc75 | 2008-12-25 13:38:39 +0100 | [diff] [blame] | 445 | ipi_call_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | /* Switch on interrupts */ |
| 447 | local_irq_enable(); |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 448 | /* Print info about this processor */ |
Martin Schwidefsky | 7b46848 | 2009-03-26 15:24:42 +0100 | [diff] [blame] | 449 | print_cpu_info(); |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 450 | /* cpu_idle will call schedule for us */ |
| 451 | cpu_idle(); |
| 452 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | } |
| 454 | |
| 455 | static void __init smp_create_idle(unsigned int cpu) |
| 456 | { |
| 457 | struct task_struct *p; |
| 458 | |
| 459 | /* |
| 460 | * don't care about the psw and regs settings since we'll never |
| 461 | * reschedule the forked task. |
| 462 | */ |
| 463 | p = fork_idle(cpu); |
| 464 | if (IS_ERR(p)) |
| 465 | panic("failed fork for CPU %u: %li", cpu, PTR_ERR(p)); |
| 466 | current_set[cpu] = p; |
| 467 | } |
| 468 | |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 469 | static int __cpuinit smp_alloc_lowcore(int cpu) |
| 470 | { |
| 471 | unsigned long async_stack, panic_stack; |
| 472 | struct _lowcore *lowcore; |
| 473 | int lc_order; |
| 474 | |
| 475 | lc_order = sizeof(long) == 8 ? 1 : 0; |
| 476 | lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, lc_order); |
| 477 | if (!lowcore) |
| 478 | return -ENOMEM; |
| 479 | async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 480 | panic_stack = __get_free_page(GFP_KERNEL); |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 481 | if (!panic_stack || !async_stack) |
| 482 | goto out; |
Heiko Carstens | 98c7b38 | 2008-03-05 12:37:09 +0100 | [diff] [blame] | 483 | memcpy(lowcore, &S390_lowcore, 512); |
| 484 | memset((char *)lowcore + 512, 0, sizeof(*lowcore) - 512); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 485 | lowcore->async_stack = async_stack + ASYNC_SIZE; |
| 486 | lowcore->panic_stack = panic_stack + PAGE_SIZE; |
| 487 | |
| 488 | #ifndef CONFIG_64BIT |
| 489 | if (MACHINE_HAS_IEEE) { |
| 490 | unsigned long save_area; |
| 491 | |
| 492 | save_area = get_zeroed_page(GFP_KERNEL); |
| 493 | if (!save_area) |
Martin Schwidefsky | 33b1d09 | 2008-12-25 13:39:27 +0100 | [diff] [blame] | 494 | goto out; |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 495 | lowcore->extended_save_area_addr = (u32) save_area; |
| 496 | } |
Martin Schwidefsky | c742b31 | 2008-12-31 15:11:42 +0100 | [diff] [blame] | 497 | #else |
| 498 | if (vdso_alloc_per_cpu(cpu, lowcore)) |
| 499 | goto out; |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 500 | #endif |
| 501 | lowcore_ptr[cpu] = lowcore; |
| 502 | return 0; |
| 503 | |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 504 | out: |
Martin Schwidefsky | 33b1d09 | 2008-12-25 13:39:27 +0100 | [diff] [blame] | 505 | free_page(panic_stack); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 506 | free_pages(async_stack, ASYNC_ORDER); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 507 | free_pages((unsigned long) lowcore, lc_order); |
| 508 | return -ENOMEM; |
| 509 | } |
| 510 | |
| 511 | #ifdef CONFIG_HOTPLUG_CPU |
| 512 | static void smp_free_lowcore(int cpu) |
| 513 | { |
| 514 | struct _lowcore *lowcore; |
| 515 | int lc_order; |
| 516 | |
| 517 | lc_order = sizeof(long) == 8 ? 1 : 0; |
| 518 | lowcore = lowcore_ptr[cpu]; |
| 519 | #ifndef CONFIG_64BIT |
| 520 | if (MACHINE_HAS_IEEE) |
| 521 | free_page((unsigned long) lowcore->extended_save_area_addr); |
Martin Schwidefsky | c742b31 | 2008-12-31 15:11:42 +0100 | [diff] [blame] | 522 | #else |
| 523 | vdso_free_per_cpu(cpu, lowcore); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 524 | #endif |
| 525 | free_page(lowcore->panic_stack - PAGE_SIZE); |
| 526 | free_pages(lowcore->async_stack - ASYNC_SIZE, ASYNC_ORDER); |
| 527 | free_pages((unsigned long) lowcore, lc_order); |
| 528 | lowcore_ptr[cpu] = NULL; |
| 529 | } |
| 530 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 531 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | /* Upping and downing of CPUs */ |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 533 | int __cpuinit __cpu_up(unsigned int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | { |
| 535 | struct task_struct *idle; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 536 | struct _lowcore *cpu_lowcore; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 537 | struct stack_frame *sf; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 538 | sigp_ccode ccode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 539 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 540 | if (smp_cpu_state[cpu] != CPU_STATE_CONFIGURED) |
| 541 | return -EIO; |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 542 | if (smp_alloc_lowcore(cpu)) |
| 543 | return -ENOMEM; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | |
| 545 | ccode = signal_processor_p((__u32)(unsigned long)(lowcore_ptr[cpu]), |
| 546 | cpu, sigp_set_prefix); |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 547 | if (ccode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 548 | return -EIO; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 549 | |
| 550 | idle = current_set[cpu]; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 551 | cpu_lowcore = lowcore_ptr[cpu]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 552 | cpu_lowcore->kernel_stack = (unsigned long) |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 553 | task_stack_page(idle) + THREAD_SIZE; |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 554 | cpu_lowcore->thread_info = (unsigned long) task_thread_info(idle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | sf = (struct stack_frame *) (cpu_lowcore->kernel_stack |
| 556 | - sizeof(struct pt_regs) |
| 557 | - sizeof(struct stack_frame)); |
| 558 | memset(sf, 0, sizeof(struct stack_frame)); |
| 559 | sf->gprs[9] = (unsigned long) sf; |
| 560 | cpu_lowcore->save_area[15] = (unsigned long) sf; |
Segher Boessenkool | 24d3e21 | 2008-06-10 10:03:23 +0200 | [diff] [blame] | 561 | __ctl_store(cpu_lowcore->cregs_save_area, 0, 15); |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 562 | asm volatile( |
| 563 | " stam 0,15,0(%0)" |
| 564 | : : "a" (&cpu_lowcore->access_regs_save_area) : "memory"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | cpu_lowcore->percpu_offset = __per_cpu_offset[cpu]; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 566 | cpu_lowcore->current_task = (unsigned long) idle; |
Martin Schwidefsky | 7b46848 | 2009-03-26 15:24:42 +0100 | [diff] [blame] | 567 | cpu_lowcore->cpu_nr = cpu; |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 568 | cpu_lowcore->kernel_asce = S390_lowcore.kernel_asce; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 569 | eieio(); |
Michael Ryan | 699ff13 | 2006-03-24 03:15:17 -0800 | [diff] [blame] | 570 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 571 | while (signal_processor(cpu, sigp_restart) == sigp_busy) |
Michael Ryan | 699ff13 | 2006-03-24 03:15:17 -0800 | [diff] [blame] | 572 | udelay(10); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | |
| 574 | while (!cpu_online(cpu)) |
| 575 | cpu_relax(); |
| 576 | return 0; |
| 577 | } |
| 578 | |
Heiko Carstens | 37a3302 | 2006-02-17 13:52:47 -0800 | [diff] [blame] | 579 | static int __init setup_possible_cpus(char *s) |
| 580 | { |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 581 | int pcpus, cpu; |
| 582 | |
| 583 | pcpus = simple_strtoul(s, NULL, 0); |
| 584 | cpu_possible_map = cpumask_of_cpu(0); |
| 585 | for (cpu = 1; cpu < pcpus && cpu < NR_CPUS; cpu++) |
| 586 | cpu_set(cpu, cpu_possible_map); |
Heiko Carstens | 37a3302 | 2006-02-17 13:52:47 -0800 | [diff] [blame] | 587 | return 0; |
| 588 | } |
| 589 | early_param("possible_cpus", setup_possible_cpus); |
| 590 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 591 | #ifdef CONFIG_HOTPLUG_CPU |
| 592 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 593 | int __cpu_disable(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | { |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 595 | struct ec_creg_mask_parms cr_parms; |
Zwane Mwaikambo | f370513 | 2005-06-25 14:54:50 -0700 | [diff] [blame] | 596 | int cpu = smp_processor_id(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | |
Zwane Mwaikambo | f370513 | 2005-06-25 14:54:50 -0700 | [diff] [blame] | 598 | cpu_clear(cpu, cpu_online_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 600 | /* Disable pfault pseudo page faults on this cpu. */ |
Heiko Carstens | 29b08d2 | 2006-12-04 15:40:40 +0100 | [diff] [blame] | 601 | pfault_fini(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 602 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 603 | memset(&cr_parms.orvals, 0, sizeof(cr_parms.orvals)); |
| 604 | memset(&cr_parms.andvals, 0xff, sizeof(cr_parms.andvals)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 605 | |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 606 | /* disable all external interrupts */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 607 | cr_parms.orvals[0] = 0; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 608 | cr_parms.andvals[0] = ~(1 << 15 | 1 << 14 | 1 << 13 | 1 << 12 | |
| 609 | 1 << 11 | 1 << 10 | 1 << 6 | 1 << 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 610 | /* disable all I/O interrupts */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | cr_parms.orvals[6] = 0; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 612 | cr_parms.andvals[6] = ~(1 << 31 | 1 << 30 | 1 << 29 | 1 << 28 | |
| 613 | 1 << 27 | 1 << 26 | 1 << 25 | 1 << 24); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 614 | /* disable most machine checks */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | cr_parms.orvals[14] = 0; |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 616 | cr_parms.andvals[14] = ~(1 << 28 | 1 << 27 | 1 << 26 | |
| 617 | 1 << 25 | 1 << 24); |
Martin Schwidefsky | 94c12cc | 2006-09-28 16:56:43 +0200 | [diff] [blame] | 618 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | smp_ctl_bit_callback(&cr_parms); |
| 620 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | return 0; |
| 622 | } |
| 623 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 624 | void __cpu_die(unsigned int cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | { |
| 626 | /* Wait until target cpu is down */ |
| 627 | while (!smp_cpu_not_running(cpu)) |
| 628 | cpu_relax(); |
Heiko Carstens | 1cb6bb4 | 2008-01-26 14:11:14 +0100 | [diff] [blame] | 629 | smp_free_lowcore(cpu); |
Martin Schwidefsky | 395d31d | 2008-12-25 13:39:50 +0100 | [diff] [blame] | 630 | pr_info("Processor %d stopped\n", cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | } |
| 632 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 633 | void cpu_die(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | { |
| 635 | idle_task_exit(); |
| 636 | signal_processor(smp_processor_id(), sigp_stop); |
| 637 | BUG(); |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 638 | for (;;); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 639 | } |
| 640 | |
Heiko Carstens | 255acee | 2006-02-17 13:52:46 -0800 | [diff] [blame] | 641 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 642 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | void __init smp_prepare_cpus(unsigned int max_cpus) |
| 644 | { |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 645 | #ifndef CONFIG_64BIT |
| 646 | unsigned long save_area = 0; |
| 647 | #endif |
| 648 | unsigned long async_stack, panic_stack; |
| 649 | struct _lowcore *lowcore; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | unsigned int cpu; |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 651 | int lc_order; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 653 | smp_detect_cpus(); |
| 654 | |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 655 | /* request the 0x1201 emergency signal external interrupt */ |
| 656 | if (register_external_interrupt(0x1201, do_ext_call_interrupt) != 0) |
| 657 | panic("Couldn't request external interrupt 0x1201"); |
Martin Schwidefsky | 7b46848 | 2009-03-26 15:24:42 +0100 | [diff] [blame] | 658 | print_cpu_info(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 660 | /* Reallocate current lowcore, but keep its contents. */ |
| 661 | lc_order = sizeof(long) == 8 ? 1 : 0; |
| 662 | lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, lc_order); |
| 663 | panic_stack = __get_free_page(GFP_KERNEL); |
| 664 | async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER); |
Martin Schwidefsky | c742b31 | 2008-12-31 15:11:42 +0100 | [diff] [blame] | 665 | BUG_ON(!lowcore || !panic_stack || !async_stack); |
Martin Schwidefsky | 347a8dc | 2006-01-06 00:19:28 -0800 | [diff] [blame] | 666 | #ifndef CONFIG_64BIT |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 667 | if (MACHINE_HAS_IEEE) |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 668 | save_area = get_zeroed_page(GFP_KERNEL); |
Heiko Carstens | 77fa224 | 2005-06-25 14:55:30 -0700 | [diff] [blame] | 669 | #endif |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 670 | local_irq_disable(); |
| 671 | local_mcck_disable(); |
| 672 | lowcore_ptr[smp_processor_id()] = lowcore; |
| 673 | *lowcore = S390_lowcore; |
| 674 | lowcore->panic_stack = panic_stack + PAGE_SIZE; |
| 675 | lowcore->async_stack = async_stack + ASYNC_SIZE; |
| 676 | #ifndef CONFIG_64BIT |
| 677 | if (MACHINE_HAS_IEEE) |
| 678 | lowcore->extended_save_area_addr = (u32) save_area; |
Martin Schwidefsky | c742b31 | 2008-12-31 15:11:42 +0100 | [diff] [blame] | 679 | #else |
Heiko Carstens | 81ffa04 | 2009-01-09 12:14:54 +0100 | [diff] [blame] | 680 | if (vdso_alloc_per_cpu(smp_processor_id(), lowcore)) |
| 681 | BUG(); |
Heiko Carstens | 591bb4f | 2008-02-19 15:29:29 +0100 | [diff] [blame] | 682 | #endif |
| 683 | set_prefix((u32)(unsigned long) lowcore); |
| 684 | local_mcck_enable(); |
| 685 | local_irq_enable(); |
KAMEZAWA Hiroyuki | 97db7fb | 2006-03-31 02:30:26 -0800 | [diff] [blame] | 686 | for_each_possible_cpu(cpu) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | if (cpu != smp_processor_id()) |
| 688 | smp_create_idle(cpu); |
| 689 | } |
| 690 | |
Heiko Carstens | ea1f4ee | 2007-05-31 17:38:05 +0200 | [diff] [blame] | 691 | void __init smp_prepare_boot_cpu(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | { |
| 693 | BUG_ON(smp_processor_id() != 0); |
| 694 | |
Heiko Carstens | 48483b3 | 2008-01-26 14:11:05 +0100 | [diff] [blame] | 695 | current_thread_info()->cpu = 0; |
| 696 | cpu_set(0, cpu_present_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | cpu_set(0, cpu_online_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 698 | S390_lowcore.percpu_offset = __per_cpu_offset[0]; |
| 699 | current_set[0] = current; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 700 | smp_cpu_state[0] = CPU_STATE_CONFIGURED; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 701 | smp_cpu_polarization[0] = POLARIZATION_UNKNWN; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 702 | } |
| 703 | |
Heiko Carstens | ea1f4ee | 2007-05-31 17:38:05 +0200 | [diff] [blame] | 704 | void __init smp_cpus_done(unsigned int max_cpus) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 706 | } |
| 707 | |
| 708 | /* |
| 709 | * the frequency of the profiling timer can be changed |
| 710 | * by writing a multiplier value into /proc/profile. |
| 711 | * |
| 712 | * usually you want to run this on all CPUs ;) |
| 713 | */ |
| 714 | int setup_profiling_timer(unsigned int multiplier) |
| 715 | { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 716 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 717 | } |
| 718 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 719 | #ifdef CONFIG_HOTPLUG_CPU |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 720 | static ssize_t cpu_configure_show(struct sys_device *dev, |
| 721 | struct sysdev_attribute *attr, char *buf) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 722 | { |
| 723 | ssize_t count; |
| 724 | |
| 725 | mutex_lock(&smp_cpu_state_mutex); |
| 726 | count = sprintf(buf, "%d\n", smp_cpu_state[dev->id]); |
| 727 | mutex_unlock(&smp_cpu_state_mutex); |
| 728 | return count; |
| 729 | } |
| 730 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 731 | static ssize_t cpu_configure_store(struct sys_device *dev, |
| 732 | struct sysdev_attribute *attr, |
| 733 | const char *buf, size_t count) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 734 | { |
| 735 | int cpu = dev->id; |
| 736 | int val, rc; |
| 737 | char delim; |
| 738 | |
| 739 | if (sscanf(buf, "%d %c", &val, &delim) != 1) |
| 740 | return -EINVAL; |
| 741 | if (val != 0 && val != 1) |
| 742 | return -EINVAL; |
| 743 | |
Martin Schwidefsky | 9d40d2e | 2008-01-26 14:11:31 +0100 | [diff] [blame] | 744 | get_online_cpus(); |
Heiko Carstens | 0b18d31 | 2008-04-30 13:38:36 +0200 | [diff] [blame] | 745 | mutex_lock(&smp_cpu_state_mutex); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 746 | rc = -EBUSY; |
| 747 | if (cpu_online(cpu)) |
| 748 | goto out; |
| 749 | rc = 0; |
| 750 | switch (val) { |
| 751 | case 0: |
| 752 | if (smp_cpu_state[cpu] == CPU_STATE_CONFIGURED) { |
| 753 | rc = sclp_cpu_deconfigure(__cpu_logical_map[cpu]); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 754 | if (!rc) { |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 755 | smp_cpu_state[cpu] = CPU_STATE_STANDBY; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 756 | smp_cpu_polarization[cpu] = POLARIZATION_UNKNWN; |
| 757 | } |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 758 | } |
| 759 | break; |
| 760 | case 1: |
| 761 | if (smp_cpu_state[cpu] == CPU_STATE_STANDBY) { |
| 762 | rc = sclp_cpu_configure(__cpu_logical_map[cpu]); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 763 | if (!rc) { |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 764 | smp_cpu_state[cpu] = CPU_STATE_CONFIGURED; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 765 | smp_cpu_polarization[cpu] = POLARIZATION_UNKNWN; |
| 766 | } |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 767 | } |
| 768 | break; |
| 769 | default: |
| 770 | break; |
| 771 | } |
| 772 | out: |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 773 | mutex_unlock(&smp_cpu_state_mutex); |
Heiko Carstens | 0b18d31 | 2008-04-30 13:38:36 +0200 | [diff] [blame] | 774 | put_online_cpus(); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 775 | return rc ? rc : count; |
| 776 | } |
| 777 | static SYSDEV_ATTR(configure, 0644, cpu_configure_show, cpu_configure_store); |
| 778 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 779 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 780 | static ssize_t cpu_polarization_show(struct sys_device *dev, |
| 781 | struct sysdev_attribute *attr, char *buf) |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 782 | { |
| 783 | int cpu = dev->id; |
| 784 | ssize_t count; |
| 785 | |
| 786 | mutex_lock(&smp_cpu_state_mutex); |
| 787 | switch (smp_cpu_polarization[cpu]) { |
| 788 | case POLARIZATION_HRZ: |
| 789 | count = sprintf(buf, "horizontal\n"); |
| 790 | break; |
| 791 | case POLARIZATION_VL: |
| 792 | count = sprintf(buf, "vertical:low\n"); |
| 793 | break; |
| 794 | case POLARIZATION_VM: |
| 795 | count = sprintf(buf, "vertical:medium\n"); |
| 796 | break; |
| 797 | case POLARIZATION_VH: |
| 798 | count = sprintf(buf, "vertical:high\n"); |
| 799 | break; |
| 800 | default: |
| 801 | count = sprintf(buf, "unknown\n"); |
| 802 | break; |
| 803 | } |
| 804 | mutex_unlock(&smp_cpu_state_mutex); |
| 805 | return count; |
| 806 | } |
| 807 | static SYSDEV_ATTR(polarization, 0444, cpu_polarization_show, NULL); |
| 808 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 809 | static ssize_t show_cpu_address(struct sys_device *dev, |
| 810 | struct sysdev_attribute *attr, char *buf) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 811 | { |
| 812 | return sprintf(buf, "%d\n", __cpu_logical_map[dev->id]); |
| 813 | } |
| 814 | static SYSDEV_ATTR(address, 0444, show_cpu_address, NULL); |
| 815 | |
| 816 | |
| 817 | static struct attribute *cpu_common_attrs[] = { |
| 818 | #ifdef CONFIG_HOTPLUG_CPU |
| 819 | &attr_configure.attr, |
| 820 | #endif |
| 821 | &attr_address.attr, |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 822 | &attr_polarization.attr, |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 823 | NULL, |
| 824 | }; |
| 825 | |
| 826 | static struct attribute_group cpu_common_attr_group = { |
| 827 | .attrs = cpu_common_attrs, |
| 828 | }; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 830 | static ssize_t show_capability(struct sys_device *dev, |
| 831 | struct sysdev_attribute *attr, char *buf) |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 832 | { |
| 833 | unsigned int capability; |
| 834 | int rc; |
| 835 | |
| 836 | rc = get_cpu_capability(&capability); |
| 837 | if (rc) |
| 838 | return rc; |
| 839 | return sprintf(buf, "%u\n", capability); |
| 840 | } |
| 841 | static SYSDEV_ATTR(capability, 0444, show_capability, NULL); |
| 842 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 843 | static ssize_t show_idle_count(struct sys_device *dev, |
| 844 | struct sysdev_attribute *attr, char *buf) |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 845 | { |
| 846 | struct s390_idle_data *idle; |
| 847 | unsigned long long idle_count; |
| 848 | |
| 849 | idle = &per_cpu(s390_idle, dev->id); |
Martin Schwidefsky | 6f43092 | 2008-12-31 15:11:40 +0100 | [diff] [blame] | 850 | spin_lock(&idle->lock); |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 851 | idle_count = idle->idle_count; |
Martin Schwidefsky | 6f43092 | 2008-12-31 15:11:40 +0100 | [diff] [blame] | 852 | if (idle->idle_enter) |
| 853 | idle_count++; |
| 854 | spin_unlock(&idle->lock); |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 855 | return sprintf(buf, "%llu\n", idle_count); |
| 856 | } |
| 857 | static SYSDEV_ATTR(idle_count, 0444, show_idle_count, NULL); |
| 858 | |
Andi Kleen | 4a0b2b4 | 2008-07-01 18:48:41 +0200 | [diff] [blame] | 859 | static ssize_t show_idle_time(struct sys_device *dev, |
| 860 | struct sysdev_attribute *attr, char *buf) |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 861 | { |
| 862 | struct s390_idle_data *idle; |
Martin Schwidefsky | 6f43092 | 2008-12-31 15:11:40 +0100 | [diff] [blame] | 863 | unsigned long long now, idle_time, idle_enter; |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 864 | |
| 865 | idle = &per_cpu(s390_idle, dev->id); |
Martin Schwidefsky | 6f43092 | 2008-12-31 15:11:40 +0100 | [diff] [blame] | 866 | spin_lock(&idle->lock); |
| 867 | now = get_clock(); |
| 868 | idle_time = idle->idle_time; |
| 869 | idle_enter = idle->idle_enter; |
| 870 | if (idle_enter != 0ULL && idle_enter < now) |
| 871 | idle_time += now - idle_enter; |
| 872 | spin_unlock(&idle->lock); |
| 873 | return sprintf(buf, "%llu\n", idle_time >> 12); |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 874 | } |
Heiko Carstens | 69d39d6 | 2007-11-05 11:10:13 +0100 | [diff] [blame] | 875 | static SYSDEV_ATTR(idle_time_us, 0444, show_idle_time, NULL); |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 876 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 877 | static struct attribute *cpu_online_attrs[] = { |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 878 | &attr_capability.attr, |
| 879 | &attr_idle_count.attr, |
Heiko Carstens | 69d39d6 | 2007-11-05 11:10:13 +0100 | [diff] [blame] | 880 | &attr_idle_time_us.attr, |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 881 | NULL, |
| 882 | }; |
| 883 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 884 | static struct attribute_group cpu_online_attr_group = { |
| 885 | .attrs = cpu_online_attrs, |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 886 | }; |
| 887 | |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 888 | static int __cpuinit smp_cpu_notify(struct notifier_block *self, |
| 889 | unsigned long action, void *hcpu) |
| 890 | { |
| 891 | unsigned int cpu = (unsigned int)(long)hcpu; |
| 892 | struct cpu *c = &per_cpu(cpu_devices, cpu); |
| 893 | struct sys_device *s = &c->sysdev; |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 894 | struct s390_idle_data *idle; |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 895 | |
| 896 | switch (action) { |
| 897 | case CPU_ONLINE: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 898 | case CPU_ONLINE_FROZEN: |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 899 | idle = &per_cpu(s390_idle, cpu); |
| 900 | spin_lock_irq(&idle->lock); |
| 901 | idle->idle_enter = 0; |
| 902 | idle->idle_time = 0; |
| 903 | idle->idle_count = 0; |
| 904 | spin_unlock_irq(&idle->lock); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 905 | if (sysfs_create_group(&s->kobj, &cpu_online_attr_group)) |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 906 | return NOTIFY_BAD; |
| 907 | break; |
| 908 | case CPU_DEAD: |
Rafael J. Wysocki | 8bb7844 | 2007-05-09 02:35:10 -0700 | [diff] [blame] | 909 | case CPU_DEAD_FROZEN: |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 910 | sysfs_remove_group(&s->kobj, &cpu_online_attr_group); |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 911 | break; |
| 912 | } |
| 913 | return NOTIFY_OK; |
| 914 | } |
| 915 | |
| 916 | static struct notifier_block __cpuinitdata smp_cpu_nb = { |
Heiko Carstens | 39ce010 | 2007-04-27 16:02:00 +0200 | [diff] [blame] | 917 | .notifier_call = smp_cpu_notify, |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 918 | }; |
| 919 | |
Heiko Carstens | 2bc89b5 | 2008-02-05 16:50:40 +0100 | [diff] [blame] | 920 | static int __devinit smp_add_present_cpu(int cpu) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 921 | { |
| 922 | struct cpu *c = &per_cpu(cpu_devices, cpu); |
| 923 | struct sys_device *s = &c->sysdev; |
| 924 | int rc; |
| 925 | |
| 926 | c->hotpluggable = 1; |
| 927 | rc = register_cpu(c, cpu); |
| 928 | if (rc) |
| 929 | goto out; |
| 930 | rc = sysfs_create_group(&s->kobj, &cpu_common_attr_group); |
| 931 | if (rc) |
| 932 | goto out_cpu; |
| 933 | if (!cpu_online(cpu)) |
| 934 | goto out; |
| 935 | rc = sysfs_create_group(&s->kobj, &cpu_online_attr_group); |
| 936 | if (!rc) |
| 937 | return 0; |
| 938 | sysfs_remove_group(&s->kobj, &cpu_common_attr_group); |
| 939 | out_cpu: |
| 940 | #ifdef CONFIG_HOTPLUG_CPU |
| 941 | unregister_cpu(c); |
| 942 | #endif |
| 943 | out: |
| 944 | return rc; |
| 945 | } |
| 946 | |
| 947 | #ifdef CONFIG_HOTPLUG_CPU |
Heiko Carstens | 1e48951 | 2008-04-30 13:38:37 +0200 | [diff] [blame] | 948 | |
Heiko Carstens | 67060d9 | 2008-05-30 10:03:27 +0200 | [diff] [blame] | 949 | int __ref smp_rescan_cpus(void) |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 950 | { |
| 951 | cpumask_t newcpus; |
| 952 | int cpu; |
| 953 | int rc; |
| 954 | |
Martin Schwidefsky | 9d40d2e | 2008-01-26 14:11:31 +0100 | [diff] [blame] | 955 | get_online_cpus(); |
Heiko Carstens | 0b18d31 | 2008-04-30 13:38:36 +0200 | [diff] [blame] | 956 | mutex_lock(&smp_cpu_state_mutex); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 957 | newcpus = cpu_present_map; |
Heiko Carstens | 1e48951 | 2008-04-30 13:38:37 +0200 | [diff] [blame] | 958 | rc = __smp_rescan_cpus(); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 959 | if (rc) |
| 960 | goto out; |
| 961 | cpus_andnot(newcpus, cpu_present_map, newcpus); |
| 962 | for_each_cpu_mask(cpu, newcpus) { |
| 963 | rc = smp_add_present_cpu(cpu); |
| 964 | if (rc) |
| 965 | cpu_clear(cpu, cpu_present_map); |
| 966 | } |
| 967 | rc = 0; |
| 968 | out: |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 969 | mutex_unlock(&smp_cpu_state_mutex); |
Heiko Carstens | 0b18d31 | 2008-04-30 13:38:36 +0200 | [diff] [blame] | 970 | put_online_cpus(); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 971 | if (!cpus_empty(newcpus)) |
| 972 | topology_schedule_update(); |
Heiko Carstens | 1e48951 | 2008-04-30 13:38:37 +0200 | [diff] [blame] | 973 | return rc; |
| 974 | } |
| 975 | |
Heiko Carstens | da5aae7 | 2008-10-28 11:10:16 +0100 | [diff] [blame] | 976 | static ssize_t __ref rescan_store(struct sysdev_class *class, const char *buf, |
Heiko Carstens | 1e48951 | 2008-04-30 13:38:37 +0200 | [diff] [blame] | 977 | size_t count) |
| 978 | { |
| 979 | int rc; |
| 980 | |
| 981 | rc = smp_rescan_cpus(); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 982 | return rc ? rc : count; |
| 983 | } |
Heiko Carstens | da5aae7 | 2008-10-28 11:10:16 +0100 | [diff] [blame] | 984 | static SYSDEV_CLASS_ATTR(rescan, 0200, NULL, rescan_store); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 985 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 986 | |
Heiko Carstens | da5aae7 | 2008-10-28 11:10:16 +0100 | [diff] [blame] | 987 | static ssize_t dispatching_show(struct sysdev_class *class, char *buf) |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 988 | { |
| 989 | ssize_t count; |
| 990 | |
| 991 | mutex_lock(&smp_cpu_state_mutex); |
| 992 | count = sprintf(buf, "%d\n", cpu_management); |
| 993 | mutex_unlock(&smp_cpu_state_mutex); |
| 994 | return count; |
| 995 | } |
| 996 | |
Heiko Carstens | da5aae7 | 2008-10-28 11:10:16 +0100 | [diff] [blame] | 997 | static ssize_t dispatching_store(struct sysdev_class *dev, const char *buf, |
| 998 | size_t count) |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 999 | { |
| 1000 | int val, rc; |
| 1001 | char delim; |
| 1002 | |
| 1003 | if (sscanf(buf, "%d %c", &val, &delim) != 1) |
| 1004 | return -EINVAL; |
| 1005 | if (val != 0 && val != 1) |
| 1006 | return -EINVAL; |
| 1007 | rc = 0; |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1008 | get_online_cpus(); |
Heiko Carstens | 0b18d31 | 2008-04-30 13:38:36 +0200 | [diff] [blame] | 1009 | mutex_lock(&smp_cpu_state_mutex); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1010 | if (cpu_management == val) |
| 1011 | goto out; |
| 1012 | rc = topology_set_cpu_management(val); |
| 1013 | if (!rc) |
| 1014 | cpu_management = val; |
| 1015 | out: |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1016 | mutex_unlock(&smp_cpu_state_mutex); |
Heiko Carstens | 0b18d31 | 2008-04-30 13:38:36 +0200 | [diff] [blame] | 1017 | put_online_cpus(); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1018 | return rc ? rc : count; |
| 1019 | } |
Heiko Carstens | da5aae7 | 2008-10-28 11:10:16 +0100 | [diff] [blame] | 1020 | static SYSDEV_CLASS_ATTR(dispatching, 0644, dispatching_show, |
| 1021 | dispatching_store); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1022 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1023 | static int __init topology_init(void) |
| 1024 | { |
| 1025 | int cpu; |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 1026 | int rc; |
Heiko Carstens | 2fc2d1e | 2007-04-27 16:01:56 +0200 | [diff] [blame] | 1027 | |
| 1028 | register_cpu_notifier(&smp_cpu_nb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1029 | |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1030 | #ifdef CONFIG_HOTPLUG_CPU |
Heiko Carstens | da5aae7 | 2008-10-28 11:10:16 +0100 | [diff] [blame] | 1031 | rc = sysdev_class_create_file(&cpu_sysdev_class, &attr_rescan); |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1032 | if (rc) |
| 1033 | return rc; |
| 1034 | #endif |
Heiko Carstens | da5aae7 | 2008-10-28 11:10:16 +0100 | [diff] [blame] | 1035 | rc = sysdev_class_create_file(&cpu_sysdev_class, &attr_dispatching); |
Heiko Carstens | c10fde0 | 2008-04-17 07:46:13 +0200 | [diff] [blame] | 1036 | if (rc) |
| 1037 | return rc; |
Heiko Carstens | 08d0796 | 2008-01-26 14:10:56 +0100 | [diff] [blame] | 1038 | for_each_present_cpu(cpu) { |
| 1039 | rc = smp_add_present_cpu(cpu); |
Heiko Carstens | fae8b22 | 2007-10-22 12:52:39 +0200 | [diff] [blame] | 1040 | if (rc) |
| 1041 | return rc; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | } |
| 1043 | return 0; |
| 1044 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1045 | subsys_initcall(topology_init); |