Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * SMP boot-related support |
| 3 | * |
David Mosberger-Tang | 8297511 | 2005-04-25 11:44:02 -0700 | [diff] [blame] | 4 | * Copyright (C) 1998-2003, 2005 Hewlett-Packard Co |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 5 | * David Mosberger-Tang <davidm@hpl.hp.com> |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 6 | * Copyright (C) 2001, 2004-2005 Intel Corp |
| 7 | * Rohit Seth <rohit.seth@intel.com> |
| 8 | * Suresh Siddha <suresh.b.siddha@intel.com> |
| 9 | * Gordon Jin <gordon.jin@intel.com> |
| 10 | * Ashok Raj <ashok.raj@intel.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | * |
| 12 | * 01/05/16 Rohit Seth <rohit.seth@intel.com> Moved SMP booting functions from smp.c to here. |
| 13 | * 01/04/27 David Mosberger <davidm@hpl.hp.com> Added ITC synching code. |
| 14 | * 02/07/31 David Mosberger <davidm@hpl.hp.com> Switch over to hotplug-CPU boot-sequence. |
| 15 | * smp_boot_cpus()/smp_commence() is replaced by |
| 16 | * smp_prepare_cpus()/__cpu_up()/smp_cpus_done(). |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 17 | * 04/06/21 Ashok Raj <ashok.raj@intel.com> Added CPU Hotplug Support |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 18 | * 04/12/26 Jin Gordon <gordon.jin@intel.com> |
| 19 | * 04/12/26 Rohit Seth <rohit.seth@intel.com> |
| 20 | * Add multi-threading and multi-core detection |
| 21 | * 05/01/30 Suresh Siddha <suresh.b.siddha@intel.com> |
| 22 | * Setup cpu_sibling_map and cpu_core_map |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
| 25 | #include <linux/module.h> |
| 26 | #include <linux/acpi.h> |
| 27 | #include <linux/bootmem.h> |
| 28 | #include <linux/cpu.h> |
| 29 | #include <linux/delay.h> |
| 30 | #include <linux/init.h> |
| 31 | #include <linux/interrupt.h> |
| 32 | #include <linux/irq.h> |
| 33 | #include <linux/kernel.h> |
| 34 | #include <linux/kernel_stat.h> |
| 35 | #include <linux/mm.h> |
| 36 | #include <linux/notifier.h> |
| 37 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | #include <linux/spinlock.h> |
| 39 | #include <linux/efi.h> |
| 40 | #include <linux/percpu.h> |
| 41 | #include <linux/bitops.h> |
| 42 | |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 43 | #include <linux/atomic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 44 | #include <asm/cache.h> |
| 45 | #include <asm/current.h> |
| 46 | #include <asm/delay.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | #include <asm/io.h> |
| 48 | #include <asm/irq.h> |
| 49 | #include <asm/machvec.h> |
| 50 | #include <asm/mca.h> |
| 51 | #include <asm/page.h> |
Isaku Yamahata | e51835d | 2008-05-19 22:13:41 +0900 | [diff] [blame] | 52 | #include <asm/paravirt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | #include <asm/pgalloc.h> |
| 54 | #include <asm/pgtable.h> |
| 55 | #include <asm/processor.h> |
| 56 | #include <asm/ptrace.h> |
| 57 | #include <asm/sal.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | #include <asm/tlbflush.h> |
| 59 | #include <asm/unistd.h> |
John Keller | 6e9de18 | 2007-08-22 19:32:06 -0500 | [diff] [blame] | 60 | #include <asm/sn/arch.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | |
| 62 | #define SMP_DEBUG 0 |
| 63 | |
| 64 | #if SMP_DEBUG |
| 65 | #define Dprintk(x...) printk(x) |
| 66 | #else |
| 67 | #define Dprintk(x...) |
| 68 | #endif |
| 69 | |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 70 | #ifdef CONFIG_HOTPLUG_CPU |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 71 | #ifdef CONFIG_PERMIT_BSP_REMOVE |
| 72 | #define bsp_remove_ok 1 |
| 73 | #else |
| 74 | #define bsp_remove_ok 0 |
| 75 | #endif |
| 76 | |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 77 | /* |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 78 | * Global array allocated for NR_CPUS at boot time |
| 79 | */ |
| 80 | struct sal_to_os_boot sal_boot_rendez_state[NR_CPUS]; |
| 81 | |
| 82 | /* |
| 83 | * start_ap in head.S uses this to store current booting cpu |
| 84 | * info. |
| 85 | */ |
| 86 | struct sal_to_os_boot *sal_state_for_booting_cpu = &sal_boot_rendez_state[0]; |
| 87 | |
| 88 | #define set_brendez_area(x) (sal_state_for_booting_cpu = &sal_boot_rendez_state[(x)]); |
| 89 | |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 90 | #else |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 91 | #define set_brendez_area(x) |
| 92 | #endif |
| 93 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | |
| 95 | /* |
| 96 | * ITC synchronization related stuff: |
| 97 | */ |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 98 | #define MASTER (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 99 | #define SLAVE (SMP_CACHE_BYTES/8) |
| 100 | |
| 101 | #define NUM_ROUNDS 64 /* magic value */ |
| 102 | #define NUM_ITERS 5 /* likewise */ |
| 103 | |
| 104 | static DEFINE_SPINLOCK(itc_sync_lock); |
| 105 | static volatile unsigned long go[SLAVE + 1]; |
| 106 | |
| 107 | #define DEBUG_ITC_SYNC 0 |
| 108 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | extern void start_ap (void); |
| 110 | extern unsigned long ia64_iobase; |
| 111 | |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 112 | struct task_struct *task_for_booting_cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | |
| 114 | /* |
| 115 | * State for each CPU |
| 116 | */ |
| 117 | DEFINE_PER_CPU(int, cpu_state); |
| 118 | |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 119 | cpumask_t cpu_core_map[NR_CPUS] __cacheline_aligned; |
Robin Holt | 42aca48 | 2008-07-28 20:36:50 -0500 | [diff] [blame] | 120 | EXPORT_SYMBOL(cpu_core_map); |
Mike Travis | d5a7430 | 2007-10-16 01:24:05 -0700 | [diff] [blame] | 121 | DEFINE_PER_CPU_SHARED_ALIGNED(cpumask_t, cpu_sibling_map); |
| 122 | EXPORT_PER_CPU_SYMBOL(cpu_sibling_map); |
| 123 | |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 124 | int smp_num_siblings = 1; |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 125 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 126 | /* which logical CPU number maps to which CPU (physical APIC ID) */ |
| 127 | volatile int ia64_cpu_to_sapicid[NR_CPUS]; |
| 128 | EXPORT_SYMBOL(ia64_cpu_to_sapicid); |
| 129 | |
| 130 | static volatile cpumask_t cpu_callin_map; |
| 131 | |
| 132 | struct smp_boot_data smp_boot_data __initdata; |
| 133 | |
| 134 | unsigned long ap_wakeup_vector = -1; /* External Int use to wakeup APs */ |
| 135 | |
| 136 | char __initdata no_int_routing; |
| 137 | |
| 138 | unsigned char smp_int_redirect; /* are INT and IPI redirectable by the chipset? */ |
| 139 | |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 140 | #ifdef CONFIG_FORCE_CPEI_RETARGET |
| 141 | #define CPEI_OVERRIDE_DEFAULT (1) |
| 142 | #else |
| 143 | #define CPEI_OVERRIDE_DEFAULT (0) |
| 144 | #endif |
| 145 | |
| 146 | unsigned int force_cpei_retarget = CPEI_OVERRIDE_DEFAULT; |
| 147 | |
| 148 | static int __init |
| 149 | cmdl_force_cpei(char *str) |
| 150 | { |
| 151 | int value=0; |
| 152 | |
| 153 | get_option (&str, &value); |
| 154 | force_cpei_retarget = value; |
| 155 | |
| 156 | return 1; |
| 157 | } |
| 158 | |
| 159 | __setup("force_cpei=", cmdl_force_cpei); |
| 160 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 161 | static int __init |
| 162 | nointroute (char *str) |
| 163 | { |
| 164 | no_int_routing = 1; |
| 165 | printk ("no_int_routing on\n"); |
| 166 | return 1; |
| 167 | } |
| 168 | |
| 169 | __setup("nointroute", nointroute); |
| 170 | |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 171 | static void fix_b0_for_bsp(void) |
| 172 | { |
| 173 | #ifdef CONFIG_HOTPLUG_CPU |
| 174 | int cpuid; |
| 175 | static int fix_bsp_b0 = 1; |
| 176 | |
| 177 | cpuid = smp_processor_id(); |
| 178 | |
| 179 | /* |
| 180 | * Cache the b0 value on the first AP that comes up |
| 181 | */ |
| 182 | if (!(fix_bsp_b0 && cpuid)) |
| 183 | return; |
| 184 | |
| 185 | sal_boot_rendez_state[0].br[0] = sal_boot_rendez_state[cpuid].br[0]; |
| 186 | printk ("Fixed BSP b0 value from CPU %d\n", cpuid); |
| 187 | |
| 188 | fix_bsp_b0 = 0; |
| 189 | #endif |
| 190 | } |
| 191 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 192 | void |
| 193 | sync_master (void *arg) |
| 194 | { |
| 195 | unsigned long flags, i; |
| 196 | |
| 197 | go[MASTER] = 0; |
| 198 | |
| 199 | local_irq_save(flags); |
| 200 | { |
| 201 | for (i = 0; i < NUM_ROUNDS*NUM_ITERS; ++i) { |
David Mosberger-Tang | 8297511 | 2005-04-25 11:44:02 -0700 | [diff] [blame] | 202 | while (!go[MASTER]) |
| 203 | cpu_relax(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | go[MASTER] = 0; |
| 205 | go[SLAVE] = ia64_get_itc(); |
| 206 | } |
| 207 | } |
| 208 | local_irq_restore(flags); |
| 209 | } |
| 210 | |
| 211 | /* |
| 212 | * Return the number of cycles by which our itc differs from the itc on the master |
| 213 | * (time-keeper) CPU. A positive number indicates our itc is ahead of the master, |
| 214 | * negative that it is behind. |
| 215 | */ |
| 216 | static inline long |
| 217 | get_delta (long *rt, long *master) |
| 218 | { |
| 219 | unsigned long best_t0 = 0, best_t1 = ~0UL, best_tm = 0; |
| 220 | unsigned long tcenter, t0, t1, tm; |
| 221 | long i; |
| 222 | |
| 223 | for (i = 0; i < NUM_ITERS; ++i) { |
| 224 | t0 = ia64_get_itc(); |
| 225 | go[MASTER] = 1; |
David Mosberger-Tang | 8297511 | 2005-04-25 11:44:02 -0700 | [diff] [blame] | 226 | while (!(tm = go[SLAVE])) |
| 227 | cpu_relax(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | go[SLAVE] = 0; |
| 229 | t1 = ia64_get_itc(); |
| 230 | |
| 231 | if (t1 - t0 < best_t1 - best_t0) |
| 232 | best_t0 = t0, best_t1 = t1, best_tm = tm; |
| 233 | } |
| 234 | |
| 235 | *rt = best_t1 - best_t0; |
| 236 | *master = best_tm - best_t0; |
| 237 | |
| 238 | /* average best_t0 and best_t1 without overflow: */ |
| 239 | tcenter = (best_t0/2 + best_t1/2); |
| 240 | if (best_t0 % 2 + best_t1 % 2 == 2) |
| 241 | ++tcenter; |
| 242 | return tcenter - best_tm; |
| 243 | } |
| 244 | |
| 245 | /* |
| 246 | * Synchronize ar.itc of the current (slave) CPU with the ar.itc of the MASTER CPU |
| 247 | * (normally the time-keeper CPU). We use a closed loop to eliminate the possibility of |
| 248 | * unaccounted-for errors (such as getting a machine check in the middle of a calibration |
| 249 | * step). The basic idea is for the slave to ask the master what itc value it has and to |
| 250 | * read its own itc before and after the master responds. Each iteration gives us three |
| 251 | * timestamps: |
| 252 | * |
| 253 | * slave master |
| 254 | * |
| 255 | * t0 ---\ |
| 256 | * ---\ |
| 257 | * ---> |
| 258 | * tm |
| 259 | * /--- |
| 260 | * /--- |
| 261 | * t1 <--- |
| 262 | * |
| 263 | * |
| 264 | * The goal is to adjust the slave's ar.itc such that tm falls exactly half-way between t0 |
| 265 | * and t1. If we achieve this, the clocks are synchronized provided the interconnect |
| 266 | * between the slave and the master is symmetric. Even if the interconnect were |
| 267 | * asymmetric, we would still know that the synchronization error is smaller than the |
| 268 | * roundtrip latency (t0 - t1). |
| 269 | * |
| 270 | * When the interconnect is quiet and symmetric, this lets us synchronize the itc to |
| 271 | * within one or two cycles. However, we can only *guarantee* that the synchronization is |
| 272 | * accurate to within a round-trip time, which is typically in the range of several |
| 273 | * hundred cycles (e.g., ~500 cycles). In practice, this means that the itc's are usually |
| 274 | * almost perfectly synchronized, but we shouldn't assume that the accuracy is much better |
| 275 | * than half a micro second or so. |
| 276 | */ |
| 277 | void |
| 278 | ia64_sync_itc (unsigned int master) |
| 279 | { |
| 280 | long i, delta, adj, adjust_latency = 0, done = 0; |
| 281 | unsigned long flags, rt, master_time_stamp, bound; |
| 282 | #if DEBUG_ITC_SYNC |
| 283 | struct { |
| 284 | long rt; /* roundtrip time */ |
| 285 | long master; /* master's timestamp */ |
| 286 | long diff; /* difference between midpoint and master's timestamp */ |
| 287 | long lat; /* estimate of itc adjustment latency */ |
| 288 | } t[NUM_ROUNDS]; |
| 289 | #endif |
| 290 | |
| 291 | /* |
| 292 | * Make sure local timer ticks are disabled while we sync. If |
| 293 | * they were enabled, we'd have to worry about nasty issues |
| 294 | * like setting the ITC ahead of (or a long time before) the |
| 295 | * next scheduled tick. |
| 296 | */ |
| 297 | BUG_ON((ia64_get_itv() & (1 << 16)) == 0); |
| 298 | |
| 299 | go[MASTER] = 1; |
| 300 | |
Jens Axboe | 8691e5a | 2008-06-06 11:18:06 +0200 | [diff] [blame] | 301 | if (smp_call_function_single(master, sync_master, NULL, 0) < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | printk(KERN_ERR "sync_itc: failed to get attention of CPU %u!\n", master); |
| 303 | return; |
| 304 | } |
| 305 | |
David Mosberger-Tang | 8297511 | 2005-04-25 11:44:02 -0700 | [diff] [blame] | 306 | while (go[MASTER]) |
| 307 | cpu_relax(); /* wait for master to be ready */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 308 | |
| 309 | spin_lock_irqsave(&itc_sync_lock, flags); |
| 310 | { |
| 311 | for (i = 0; i < NUM_ROUNDS; ++i) { |
| 312 | delta = get_delta(&rt, &master_time_stamp); |
| 313 | if (delta == 0) { |
| 314 | done = 1; /* let's lock on to this... */ |
| 315 | bound = rt; |
| 316 | } |
| 317 | |
| 318 | if (!done) { |
| 319 | if (i > 0) { |
| 320 | adjust_latency += -delta; |
| 321 | adj = -delta + adjust_latency/4; |
| 322 | } else |
| 323 | adj = -delta; |
| 324 | |
| 325 | ia64_set_itc(ia64_get_itc() + adj); |
| 326 | } |
| 327 | #if DEBUG_ITC_SYNC |
| 328 | t[i].rt = rt; |
| 329 | t[i].master = master_time_stamp; |
| 330 | t[i].diff = delta; |
| 331 | t[i].lat = adjust_latency/4; |
| 332 | #endif |
| 333 | } |
| 334 | } |
| 335 | spin_unlock_irqrestore(&itc_sync_lock, flags); |
| 336 | |
| 337 | #if DEBUG_ITC_SYNC |
| 338 | for (i = 0; i < NUM_ROUNDS; ++i) |
| 339 | printk("rt=%5ld master=%5ld diff=%5ld adjlat=%5ld\n", |
| 340 | t[i].rt, t[i].master, t[i].diff, t[i].lat); |
| 341 | #endif |
| 342 | |
| 343 | printk(KERN_INFO "CPU %d: synchronized ITC with CPU %u (last diff %ld cycles, " |
| 344 | "maxerr %lu cycles)\n", smp_processor_id(), master, delta, rt); |
| 345 | } |
| 346 | |
| 347 | /* |
| 348 | * Ideally sets up per-cpu profiling hooks. Doesn't do much now... |
| 349 | */ |
Greg Kroah-Hartman | 5b5e76e | 2012-12-21 14:05:13 -0800 | [diff] [blame] | 350 | static inline void smp_setup_percpu_timer(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | { |
| 352 | } |
| 353 | |
Paul Gortmaker | ccce9bb | 2013-06-17 15:51:20 -0400 | [diff] [blame] | 354 | static void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | smp_callin (void) |
| 356 | { |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 357 | int cpuid, phys_id, itc_master; |
Jack Steiner | ead6caa | 2007-03-27 14:30:19 -0500 | [diff] [blame] | 358 | struct cpuinfo_ia64 *last_cpuinfo, *this_cpuinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | extern void ia64_init_itm(void); |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 360 | extern volatile int time_keeper_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 361 | |
| 362 | #ifdef CONFIG_PERFMON |
| 363 | extern void pfm_init_percpu(void); |
| 364 | #endif |
| 365 | |
| 366 | cpuid = smp_processor_id(); |
| 367 | phys_id = hard_smp_processor_id(); |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 368 | itc_master = time_keeper_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | |
| 370 | if (cpu_online(cpuid)) { |
| 371 | printk(KERN_ERR "huh, phys CPU#0x%x, CPU#0x%x already present??\n", |
| 372 | phys_id, cpuid); |
| 373 | BUG(); |
| 374 | } |
| 375 | |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 376 | fix_b0_for_bsp(); |
| 377 | |
Lee Schermerhorn | 3bccd99 | 2010-05-26 14:44:59 -0700 | [diff] [blame] | 378 | /* |
| 379 | * numa_node_id() works after this. |
| 380 | */ |
| 381 | set_numa_node(cpu_to_node_map[cpuid]); |
Lee Schermerhorn | fd1197f | 2010-05-26 14:45:01 -0700 | [diff] [blame] | 382 | set_numa_mem(local_memory_node(cpu_to_node_map[cpuid])); |
Lee Schermerhorn | 3bccd99 | 2010-05-26 14:44:59 -0700 | [diff] [blame] | 383 | |
Yasuaki Ishimatsu | e1b30a3 | 2007-07-17 21:22:23 +0900 | [diff] [blame] | 384 | spin_lock(&vector_lock); |
| 385 | /* Setup the per cpu irq handling data structures */ |
| 386 | __setup_vector_irq(cpuid); |
Manfred Spraul | e545a61 | 2008-09-07 16:57:22 +0200 | [diff] [blame] | 387 | notify_cpu_starting(cpuid); |
Srivatsa S. Bhat | 7d7f984 | 2012-03-28 14:42:46 -0700 | [diff] [blame] | 388 | set_cpu_online(cpuid, true); |
Shaohua Li | a9fa06c | 2005-06-25 14:55:05 -0700 | [diff] [blame] | 389 | per_cpu(cpu_state, cpuid) = CPU_ONLINE; |
Yasuaki Ishimatsu | e1b30a3 | 2007-07-17 21:22:23 +0900 | [diff] [blame] | 390 | spin_unlock(&vector_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | |
| 392 | smp_setup_percpu_timer(); |
| 393 | |
| 394 | ia64_mca_cmc_vector_setup(); /* Setup vector on AP */ |
| 395 | |
| 396 | #ifdef CONFIG_PERFMON |
| 397 | pfm_init_percpu(); |
| 398 | #endif |
| 399 | |
| 400 | local_irq_enable(); |
| 401 | |
| 402 | if (!(sal_platform_features & IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT)) { |
| 403 | /* |
| 404 | * Synchronize the ITC with the BP. Need to do this after irqs are |
| 405 | * enabled because ia64_sync_itc() calls smp_call_function_single(), which |
| 406 | * calls spin_unlock_bh(), which calls spin_unlock_bh(), which calls |
| 407 | * local_bh_enable(), which bugs out if irqs are not enabled... |
| 408 | */ |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 409 | Dprintk("Going to syncup ITC with ITC Master.\n"); |
| 410 | ia64_sync_itc(itc_master); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | } |
| 412 | |
| 413 | /* |
| 414 | * Get our bogomips. |
| 415 | */ |
| 416 | ia64_init_itm(); |
Jack Steiner | ead6caa | 2007-03-27 14:30:19 -0500 | [diff] [blame] | 417 | |
| 418 | /* |
| 419 | * Delay calibration can be skipped if new processor is identical to the |
| 420 | * previous processor. |
| 421 | */ |
| 422 | last_cpuinfo = cpu_data(cpuid - 1); |
| 423 | this_cpuinfo = local_cpu_data; |
| 424 | if (last_cpuinfo->itc_freq != this_cpuinfo->itc_freq || |
| 425 | last_cpuinfo->proc_freq != this_cpuinfo->proc_freq || |
| 426 | last_cpuinfo->features != this_cpuinfo->features || |
| 427 | last_cpuinfo->revision != this_cpuinfo->revision || |
| 428 | last_cpuinfo->family != this_cpuinfo->family || |
| 429 | last_cpuinfo->archrev != this_cpuinfo->archrev || |
| 430 | last_cpuinfo->model != this_cpuinfo->model) |
| 431 | calibrate_delay(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | local_cpu_data->loops_per_jiffy = loops_per_jiffy; |
| 433 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | /* |
| 435 | * Allow the master to continue. |
| 436 | */ |
| 437 | cpu_set(cpuid, cpu_callin_map); |
| 438 | Dprintk("Stack on CPU %d at about %p\n",cpuid, &cpuid); |
| 439 | } |
| 440 | |
| 441 | |
| 442 | /* |
| 443 | * Activate a secondary processor. head.S calls this. |
| 444 | */ |
Paul Gortmaker | ccce9bb | 2013-06-17 15:51:20 -0400 | [diff] [blame] | 445 | int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | start_secondary (void *unused) |
| 447 | { |
| 448 | /* Early console may use I/O ports */ |
| 449 | ia64_set_kr(IA64_KR_IO_BASE, __pa(ia64_iobase)); |
Tony Luck | 10617bb | 2008-08-12 10:34:20 -0700 | [diff] [blame] | 450 | #ifndef CONFIG_PRINTK_TIME |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | Dprintk("start_secondary: starting CPU 0x%x\n", hard_smp_processor_id()); |
Tony Luck | 10617bb | 2008-08-12 10:34:20 -0700 | [diff] [blame] | 452 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | efi_map_pal_code(); |
| 454 | cpu_init(); |
Nick Piggin | 5bfb5d6 | 2005-11-08 21:39:01 -0800 | [diff] [blame] | 455 | preempt_disable(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | smp_callin(); |
| 457 | |
Thomas Gleixner | 91d591c | 2013-03-21 22:49:47 +0100 | [diff] [blame] | 458 | cpu_startup_entry(CPUHP_ONLINE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | return 0; |
| 460 | } |
| 461 | |
Paul Gortmaker | ccce9bb | 2013-06-17 15:51:20 -0400 | [diff] [blame] | 462 | static int |
Thomas Gleixner | 13583bf | 2012-04-20 13:05:49 +0000 | [diff] [blame] | 463 | do_boot_cpu (int sapicid, int cpu, struct task_struct *idle) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | { |
| 465 | int timeout; |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 466 | |
Thomas Gleixner | 13583bf | 2012-04-20 13:05:49 +0000 | [diff] [blame] | 467 | task_for_booting_cpu = idle; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | Dprintk("Sending wakeup vector %lu to AP 0x%x/0x%x.\n", ap_wakeup_vector, cpu, sapicid); |
| 469 | |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 470 | set_brendez_area(cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | platform_send_ipi(cpu, ap_wakeup_vector, IA64_IPI_DM_INT, 0); |
| 472 | |
| 473 | /* |
| 474 | * Wait 10s total for the AP to start |
| 475 | */ |
| 476 | Dprintk("Waiting on callin_map ..."); |
| 477 | for (timeout = 0; timeout < 100000; timeout++) { |
| 478 | if (cpu_isset(cpu, cpu_callin_map)) |
| 479 | break; /* It has booted */ |
| 480 | udelay(100); |
| 481 | } |
| 482 | Dprintk("\n"); |
| 483 | |
| 484 | if (!cpu_isset(cpu, cpu_callin_map)) { |
| 485 | printk(KERN_ERR "Processor 0x%x/0x%x is stuck.\n", cpu, sapicid); |
| 486 | ia64_cpu_to_sapicid[cpu] = -1; |
Srivatsa S. Bhat | 7d7f984 | 2012-03-28 14:42:46 -0700 | [diff] [blame] | 487 | set_cpu_online(cpu, false); /* was set in smp_callin() */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | return -EINVAL; |
| 489 | } |
| 490 | return 0; |
| 491 | } |
| 492 | |
| 493 | static int __init |
| 494 | decay (char *str) |
| 495 | { |
| 496 | int ticks; |
| 497 | get_option (&str, &ticks); |
| 498 | return 1; |
| 499 | } |
| 500 | |
| 501 | __setup("decay=", decay); |
| 502 | |
| 503 | /* |
| 504 | * Initialize the logical CPU number to SAPICID mapping |
| 505 | */ |
| 506 | void __init |
| 507 | smp_build_cpu_map (void) |
| 508 | { |
| 509 | int sapicid, cpu, i; |
| 510 | int boot_cpu_id = hard_smp_processor_id(); |
| 511 | |
| 512 | for (cpu = 0; cpu < NR_CPUS; cpu++) { |
| 513 | ia64_cpu_to_sapicid[cpu] = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | } |
| 515 | |
| 516 | ia64_cpu_to_sapicid[0] = boot_cpu_id; |
Srivatsa S. Bhat | 7d7f984 | 2012-03-28 14:42:46 -0700 | [diff] [blame] | 517 | init_cpu_present(cpumask_of(0)); |
Rusty Russell | 2af51a3 | 2009-03-16 14:12:43 +1030 | [diff] [blame] | 518 | set_cpu_possible(0, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | for (cpu = 1, i = 0; i < smp_boot_data.cpu_count; i++) { |
| 520 | sapicid = smp_boot_data.cpu_phys_id[i]; |
| 521 | if (sapicid == boot_cpu_id) |
| 522 | continue; |
Rusty Russell | 2af51a3 | 2009-03-16 14:12:43 +1030 | [diff] [blame] | 523 | set_cpu_present(cpu, true); |
| 524 | set_cpu_possible(cpu, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | ia64_cpu_to_sapicid[cpu] = sapicid; |
| 526 | cpu++; |
| 527 | } |
| 528 | } |
| 529 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 530 | /* |
| 531 | * Cycle through the APs sending Wakeup IPIs to boot each. |
| 532 | */ |
| 533 | void __init |
| 534 | smp_prepare_cpus (unsigned int max_cpus) |
| 535 | { |
| 536 | int boot_cpu_id = hard_smp_processor_id(); |
| 537 | |
| 538 | /* |
| 539 | * Initialize the per-CPU profiling counter/multiplier |
| 540 | */ |
| 541 | |
| 542 | smp_setup_percpu_timer(); |
| 543 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | cpu_set(0, cpu_callin_map); |
| 545 | |
| 546 | local_cpu_data->loops_per_jiffy = loops_per_jiffy; |
| 547 | ia64_cpu_to_sapicid[0] = boot_cpu_id; |
| 548 | |
| 549 | printk(KERN_INFO "Boot processor id 0x%x/0x%x\n", 0, boot_cpu_id); |
| 550 | |
| 551 | current_thread_info()->cpu = 0; |
| 552 | |
| 553 | /* |
| 554 | * If SMP should be disabled, then really disable it! |
| 555 | */ |
| 556 | if (!max_cpus) { |
| 557 | printk(KERN_INFO "SMP mode deactivated.\n"); |
Rusty Russell | 2af51a3 | 2009-03-16 14:12:43 +1030 | [diff] [blame] | 558 | init_cpu_online(cpumask_of(0)); |
| 559 | init_cpu_present(cpumask_of(0)); |
| 560 | init_cpu_possible(cpumask_of(0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 561 | return; |
| 562 | } |
| 563 | } |
| 564 | |
Greg Kroah-Hartman | 5b5e76e | 2012-12-21 14:05:13 -0800 | [diff] [blame] | 565 | void smp_prepare_boot_cpu(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 566 | { |
Srivatsa S. Bhat | 7d7f984 | 2012-03-28 14:42:46 -0700 | [diff] [blame] | 567 | set_cpu_online(smp_processor_id(), true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | cpu_set(smp_processor_id(), cpu_callin_map); |
Lee Schermerhorn | 3bccd99 | 2010-05-26 14:44:59 -0700 | [diff] [blame] | 569 | set_numa_node(cpu_to_node_map[smp_processor_id()]); |
Shaohua Li | a9fa06c | 2005-06-25 14:55:05 -0700 | [diff] [blame] | 570 | per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE; |
Isaku Yamahata | e51835d | 2008-05-19 22:13:41 +0900 | [diff] [blame] | 571 | paravirt_post_smp_prepare_boot_cpu(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 572 | } |
| 573 | |
| 574 | #ifdef CONFIG_HOTPLUG_CPU |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 575 | static inline void |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 576 | clear_cpu_sibling_map(int cpu) |
| 577 | { |
| 578 | int i; |
| 579 | |
Mike Travis | d5a7430 | 2007-10-16 01:24:05 -0700 | [diff] [blame] | 580 | for_each_cpu_mask(i, per_cpu(cpu_sibling_map, cpu)) |
| 581 | cpu_clear(cpu, per_cpu(cpu_sibling_map, i)); |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 582 | for_each_cpu_mask(i, cpu_core_map[cpu]) |
| 583 | cpu_clear(cpu, cpu_core_map[i]); |
| 584 | |
Mike Travis | d5a7430 | 2007-10-16 01:24:05 -0700 | [diff] [blame] | 585 | per_cpu(cpu_sibling_map, cpu) = cpu_core_map[cpu] = CPU_MASK_NONE; |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 586 | } |
| 587 | |
| 588 | static void |
| 589 | remove_siblinginfo(int cpu) |
| 590 | { |
| 591 | int last = 0; |
| 592 | |
| 593 | if (cpu_data(cpu)->threads_per_core == 1 && |
| 594 | cpu_data(cpu)->cores_per_socket == 1) { |
| 595 | cpu_clear(cpu, cpu_core_map[cpu]); |
Mike Travis | d5a7430 | 2007-10-16 01:24:05 -0700 | [diff] [blame] | 596 | cpu_clear(cpu, per_cpu(cpu_sibling_map, cpu)); |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 597 | return; |
| 598 | } |
| 599 | |
| 600 | last = (cpus_weight(cpu_core_map[cpu]) == 1 ? 1 : 0); |
| 601 | |
| 602 | /* remove it from all sibling map's */ |
| 603 | clear_cpu_sibling_map(cpu); |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 604 | } |
| 605 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 606 | extern void fixup_irqs(void); |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 607 | |
| 608 | int migrate_platform_irqs(unsigned int cpu) |
| 609 | { |
| 610 | int new_cpei_cpu; |
Thomas Gleixner | 097e98b | 2011-03-25 19:00:33 +0100 | [diff] [blame] | 611 | struct irq_data *data = NULL; |
Rusty Russell | 0de2652 | 2008-12-13 21:20:26 +1030 | [diff] [blame] | 612 | const struct cpumask *mask; |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 613 | int retval = 0; |
| 614 | |
| 615 | /* |
| 616 | * dont permit CPEI target to removed. |
| 617 | */ |
| 618 | if (cpe_vector > 0 && is_cpu_cpei_target(cpu)) { |
| 619 | printk ("CPU (%d) is CPEI Target\n", cpu); |
| 620 | if (can_cpei_retarget()) { |
| 621 | /* |
| 622 | * Now re-target the CPEI to a different processor |
| 623 | */ |
Srivatsa S. Bhat | 7d7f984 | 2012-03-28 14:42:46 -0700 | [diff] [blame] | 624 | new_cpei_cpu = cpumask_any(cpu_online_mask); |
Rusty Russell | 0de2652 | 2008-12-13 21:20:26 +1030 | [diff] [blame] | 625 | mask = cpumask_of(new_cpei_cpu); |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 626 | set_cpei_target_cpu(new_cpei_cpu); |
Thomas Gleixner | 097e98b | 2011-03-25 19:00:33 +0100 | [diff] [blame] | 627 | data = irq_get_irq_data(ia64_cpe_irq); |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 628 | /* |
Simon Arlott | 72fdbdc | 2007-05-11 14:55:43 -0700 | [diff] [blame] | 629 | * Switch for now, immediately, we need to do fake intr |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 630 | * as other interrupts, but need to study CPEI behaviour with |
| 631 | * polling before making changes. |
| 632 | */ |
Thomas Gleixner | 097e98b | 2011-03-25 19:00:33 +0100 | [diff] [blame] | 633 | if (data && data->chip) { |
| 634 | data->chip->irq_disable(data); |
| 635 | data->chip->irq_set_affinity(data, mask, false); |
| 636 | data->chip->irq_enable(data); |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 637 | printk ("Re-targeting CPEI to cpu %d\n", new_cpei_cpu); |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 638 | } |
| 639 | } |
Thomas Gleixner | 097e98b | 2011-03-25 19:00:33 +0100 | [diff] [blame] | 640 | if (!data) { |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 641 | printk ("Unable to retarget CPEI, offline cpu [%d] failed\n", cpu); |
| 642 | retval = -EBUSY; |
| 643 | } |
| 644 | } |
| 645 | return retval; |
| 646 | } |
| 647 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | /* must be called with cpucontrol mutex held */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | int __cpu_disable(void) |
| 650 | { |
| 651 | int cpu = smp_processor_id(); |
| 652 | |
| 653 | /* |
| 654 | * dont permit boot processor for now |
| 655 | */ |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 656 | if (cpu == 0 && !bsp_remove_ok) { |
| 657 | printk ("Your platform does not support removal of BSP\n"); |
| 658 | return (-EBUSY); |
| 659 | } |
| 660 | |
John Keller | 6e9de18 | 2007-08-22 19:32:06 -0500 | [diff] [blame] | 661 | if (ia64_platform_is("sn2")) { |
| 662 | if (!sn_cpu_disable_allowed(cpu)) |
| 663 | return -EBUSY; |
| 664 | } |
| 665 | |
Srivatsa S. Bhat | 7d7f984 | 2012-03-28 14:42:46 -0700 | [diff] [blame] | 666 | set_cpu_online(cpu, false); |
Alex Chiang | 66db2e6 | 2009-02-09 11:16:16 -0700 | [diff] [blame] | 667 | |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 668 | if (migrate_platform_irqs(cpu)) { |
Srivatsa S. Bhat | 7d7f984 | 2012-03-28 14:42:46 -0700 | [diff] [blame] | 669 | set_cpu_online(cpu, true); |
Alex Chiang | c0acdea | 2009-02-09 11:16:57 -0700 | [diff] [blame] | 670 | return -EBUSY; |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 671 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 673 | remove_siblinginfo(cpu); |
Alex Chiang | 66db2e6 | 2009-02-09 11:16:16 -0700 | [diff] [blame] | 674 | fixup_irqs(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | local_flush_tlb_all(); |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 676 | cpu_clear(cpu, cpu_callin_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | return 0; |
| 678 | } |
| 679 | |
| 680 | void __cpu_die(unsigned int cpu) |
| 681 | { |
| 682 | unsigned int i; |
| 683 | |
| 684 | for (i = 0; i < 100; i++) { |
| 685 | /* They ack this in play_dead by setting CPU_DEAD */ |
| 686 | if (per_cpu(cpu_state, cpu) == CPU_DEAD) |
| 687 | { |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 688 | printk ("CPU %d is now offline\n", cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | return; |
| 690 | } |
| 691 | msleep(100); |
| 692 | } |
| 693 | printk(KERN_ERR "CPU %u didn't die...\n", cpu); |
| 694 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 695 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 696 | |
| 697 | void |
| 698 | smp_cpus_done (unsigned int dummy) |
| 699 | { |
| 700 | int cpu; |
| 701 | unsigned long bogosum = 0; |
| 702 | |
| 703 | /* |
| 704 | * Allow the user to impress friends. |
| 705 | */ |
| 706 | |
hawkes@sgi.com | dc565b5 | 2005-10-10 08:43:26 -0700 | [diff] [blame] | 707 | for_each_online_cpu(cpu) { |
| 708 | bogosum += cpu_data(cpu)->loops_per_jiffy; |
| 709 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | |
| 711 | printk(KERN_INFO "Total of %d processors activated (%lu.%02lu BogoMIPS).\n", |
| 712 | (int)num_online_cpus(), bogosum/(500000/HZ), (bogosum/(5000/HZ))%100); |
| 713 | } |
| 714 | |
Greg Kroah-Hartman | 5b5e76e | 2012-12-21 14:05:13 -0800 | [diff] [blame] | 715 | static inline void set_cpu_sibling_map(int cpu) |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 716 | { |
| 717 | int i; |
| 718 | |
| 719 | for_each_online_cpu(i) { |
| 720 | if ((cpu_data(cpu)->socket_id == cpu_data(i)->socket_id)) { |
| 721 | cpu_set(i, cpu_core_map[cpu]); |
| 722 | cpu_set(cpu, cpu_core_map[i]); |
| 723 | if (cpu_data(cpu)->core_id == cpu_data(i)->core_id) { |
Mike Travis | d5a7430 | 2007-10-16 01:24:05 -0700 | [diff] [blame] | 724 | cpu_set(i, per_cpu(cpu_sibling_map, cpu)); |
| 725 | cpu_set(cpu, per_cpu(cpu_sibling_map, i)); |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 726 | } |
| 727 | } |
| 728 | } |
| 729 | } |
| 730 | |
Paul Gortmaker | ccce9bb | 2013-06-17 15:51:20 -0400 | [diff] [blame] | 731 | int |
Thomas Gleixner | 8239c25 | 2012-04-20 13:05:42 +0000 | [diff] [blame] | 732 | __cpu_up(unsigned int cpu, struct task_struct *tidle) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | { |
| 734 | int ret; |
| 735 | int sapicid; |
| 736 | |
| 737 | sapicid = ia64_cpu_to_sapicid[cpu]; |
| 738 | if (sapicid == -1) |
| 739 | return -EINVAL; |
| 740 | |
| 741 | /* |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 742 | * Already booted cpu? not valid anymore since we dont |
| 743 | * do idle loop tightspin anymore. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | */ |
| 745 | if (cpu_isset(cpu, cpu_callin_map)) |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 746 | return -EINVAL; |
| 747 | |
Shaohua Li | a9fa06c | 2005-06-25 14:55:05 -0700 | [diff] [blame] | 748 | per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | /* Processor goes to start_secondary(), sets online flag */ |
Thomas Gleixner | 13583bf | 2012-04-20 13:05:49 +0000 | [diff] [blame] | 750 | ret = do_boot_cpu(sapicid, cpu, tidle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | if (ret < 0) |
| 752 | return ret; |
| 753 | |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 754 | if (cpu_data(cpu)->threads_per_core == 1 && |
| 755 | cpu_data(cpu)->cores_per_socket == 1) { |
Mike Travis | d5a7430 | 2007-10-16 01:24:05 -0700 | [diff] [blame] | 756 | cpu_set(cpu, per_cpu(cpu_sibling_map, cpu)); |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 757 | cpu_set(cpu, cpu_core_map[cpu]); |
| 758 | return 0; |
| 759 | } |
| 760 | |
| 761 | set_cpu_sibling_map(cpu); |
| 762 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | return 0; |
| 764 | } |
| 765 | |
| 766 | /* |
Simon Arlott | 72fdbdc | 2007-05-11 14:55:43 -0700 | [diff] [blame] | 767 | * Assume that CPUs have been discovered by some platform-dependent interface. For |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | * SoftSDV/Lion, that would be ACPI. |
| 769 | * |
| 770 | * Setup of the IPI irq handler is done in irq.c:init_IRQ_SMP(). |
| 771 | */ |
| 772 | void __init |
| 773 | init_smp_config(void) |
| 774 | { |
| 775 | struct fptr { |
| 776 | unsigned long fp; |
| 777 | unsigned long gp; |
| 778 | } *ap_startup; |
| 779 | long sal_ret; |
| 780 | |
Simon Arlott | 72fdbdc | 2007-05-11 14:55:43 -0700 | [diff] [blame] | 781 | /* Tell SAL where to drop the APs. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 782 | ap_startup = (struct fptr *) start_ap; |
| 783 | sal_ret = ia64_sal_set_vectors(SAL_VECTOR_OS_BOOT_RENDEZ, |
| 784 | ia64_tpa(ap_startup->fp), ia64_tpa(ap_startup->gp), 0, 0, 0, 0); |
| 785 | if (sal_ret < 0) |
| 786 | printk(KERN_ERR "SMP: Can't set SAL AP Boot Rendezvous: %s\n", |
| 787 | ia64_sal_strerror(sal_ret)); |
| 788 | } |
| 789 | |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 790 | /* |
| 791 | * identify_siblings(cpu) gets called from identify_cpu. This populates the |
| 792 | * information related to logical execution units in per_cpu_data structure. |
| 793 | */ |
Greg Kroah-Hartman | 5b5e76e | 2012-12-21 14:05:13 -0800 | [diff] [blame] | 794 | void identify_siblings(struct cpuinfo_ia64 *c) |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 795 | { |
Matthew Wilcox | e088a4a | 2009-05-22 13:49:49 -0700 | [diff] [blame] | 796 | long status; |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 797 | u16 pltid; |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 798 | pal_logical_to_physical_t info; |
| 799 | |
Alex Chiang | 6ff0bc9 | 2008-04-24 12:57:08 -0600 | [diff] [blame] | 800 | status = ia64_pal_logical_to_phys(-1, &info); |
| 801 | if (status != PAL_STATUS_SUCCESS) { |
Alex Chiang | 113134f | 2007-10-19 13:20:09 -0600 | [diff] [blame] | 802 | if (status != PAL_STATUS_UNIMPLEMENTED) { |
| 803 | printk(KERN_ERR |
| 804 | "ia64_pal_logical_to_phys failed with %ld\n", |
| 805 | status); |
| 806 | return; |
| 807 | } |
| 808 | |
| 809 | info.overview_ppid = 0; |
| 810 | info.overview_cpp = 1; |
| 811 | info.overview_tpc = 1; |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 812 | } |
Alex Chiang | 6ff0bc9 | 2008-04-24 12:57:08 -0600 | [diff] [blame] | 813 | |
| 814 | status = ia64_sal_physical_id_info(&pltid); |
| 815 | if (status != PAL_STATUS_SUCCESS) { |
| 816 | if (status != PAL_STATUS_UNIMPLEMENTED) |
| 817 | printk(KERN_ERR |
| 818 | "ia64_sal_pltid failed with %ld\n", |
| 819 | status); |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 820 | return; |
| 821 | } |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 822 | |
| 823 | c->socket_id = (pltid << 8) | info.overview_ppid; |
Alex Chiang | 113134f | 2007-10-19 13:20:09 -0600 | [diff] [blame] | 824 | |
| 825 | if (info.overview_cpp == 1 && info.overview_tpc == 1) |
| 826 | return; |
| 827 | |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 828 | c->cores_per_socket = info.overview_cpp; |
| 829 | c->threads_per_core = info.overview_tpc; |
Fenghua Yu | 4129a95 | 2006-02-27 16:16:22 -0800 | [diff] [blame] | 830 | c->num_log = info.overview_num_log; |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 831 | |
Fenghua Yu | 4129a95 | 2006-02-27 16:16:22 -0800 | [diff] [blame] | 832 | c->core_id = info.log1_cid; |
| 833 | c->thread_id = info.log1_tid; |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 834 | } |
Stephane Eranian | dd562c0 | 2006-09-21 10:35:44 -0700 | [diff] [blame] | 835 | |
| 836 | /* |
| 837 | * returns non zero, if multi-threading is enabled |
| 838 | * on at least one physical package. Due to hotplug cpu |
| 839 | * and (maxcpus=), all threads may not necessarily be enabled |
| 840 | * even though the processor supports multi-threading. |
| 841 | */ |
| 842 | int is_multithreading_enabled(void) |
| 843 | { |
| 844 | int i, j; |
| 845 | |
| 846 | for_each_present_cpu(i) { |
| 847 | for_each_present_cpu(j) { |
| 848 | if (j == i) |
| 849 | continue; |
| 850 | if ((cpu_data(j)->socket_id == cpu_data(i)->socket_id)) { |
| 851 | if (cpu_data(j)->core_id == cpu_data(i)->core_id) |
| 852 | return 1; |
| 853 | } |
| 854 | } |
| 855 | } |
| 856 | return 0; |
| 857 | } |
| 858 | EXPORT_SYMBOL_GPL(is_multithreading_enabled); |