Thomas Gleixner | 457c899 | 2019-05-19 13:08:55 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0-only |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | /* |
| 3 | * SMP boot-related support |
| 4 | * |
David Mosberger-Tang | 82975115 | 2005-04-25 11:44:02 -0700 | [diff] [blame] | 5 | * Copyright (C) 1998-2003, 2005 Hewlett-Packard Co |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | * David Mosberger-Tang <davidm@hpl.hp.com> |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 7 | * Copyright (C) 2001, 2004-2005 Intel Corp |
| 8 | * Rohit Seth <rohit.seth@intel.com> |
| 9 | * Suresh Siddha <suresh.b.siddha@intel.com> |
| 10 | * Gordon Jin <gordon.jin@intel.com> |
| 11 | * Ashok Raj <ashok.raj@intel.com> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | * |
| 13 | * 01/05/16 Rohit Seth <rohit.seth@intel.com> Moved SMP booting functions from smp.c to here. |
| 14 | * 01/04/27 David Mosberger <davidm@hpl.hp.com> Added ITC synching code. |
| 15 | * 02/07/31 David Mosberger <davidm@hpl.hp.com> Switch over to hotplug-CPU boot-sequence. |
| 16 | * smp_boot_cpus()/smp_commence() is replaced by |
| 17 | * smp_prepare_cpus()/__cpu_up()/smp_cpus_done(). |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 18 | * 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] | 19 | * 04/12/26 Jin Gordon <gordon.jin@intel.com> |
| 20 | * 04/12/26 Rohit Seth <rohit.seth@intel.com> |
| 21 | * Add multi-threading and multi-core detection |
| 22 | * 05/01/30 Suresh Siddha <suresh.b.siddha@intel.com> |
| 23 | * Setup cpu_sibling_map and cpu_core_map |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | |
| 26 | #include <linux/module.h> |
| 27 | #include <linux/acpi.h> |
Mike Rapoport | 57c8a66 | 2018-10-30 15:09:49 -0700 | [diff] [blame] | 28 | #include <linux/memblock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/cpu.h> |
| 30 | #include <linux/delay.h> |
| 31 | #include <linux/init.h> |
| 32 | #include <linux/interrupt.h> |
| 33 | #include <linux/irq.h> |
| 34 | #include <linux/kernel.h> |
| 35 | #include <linux/kernel_stat.h> |
| 36 | #include <linux/mm.h> |
| 37 | #include <linux/notifier.h> |
| 38 | #include <linux/smp.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include <linux/spinlock.h> |
| 40 | #include <linux/efi.h> |
| 41 | #include <linux/percpu.h> |
| 42 | #include <linux/bitops.h> |
| 43 | |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 44 | #include <linux/atomic.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | #include <asm/cache.h> |
| 46 | #include <asm/current.h> |
| 47 | #include <asm/delay.h> |
Ard Biesheuvel | 8ff059b | 2021-01-18 13:38:42 +0100 | [diff] [blame] | 48 | #include <asm/efi.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | #include <asm/io.h> |
| 50 | #include <asm/irq.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #include <asm/mca.h> |
| 52 | #include <asm/page.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | #include <asm/processor.h> |
| 54 | #include <asm/ptrace.h> |
| 55 | #include <asm/sal.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | #include <asm/tlbflush.h> |
| 57 | #include <asm/unistd.h> |
| 58 | |
| 59 | #define SMP_DEBUG 0 |
| 60 | |
| 61 | #if SMP_DEBUG |
| 62 | #define Dprintk(x...) printk(x) |
| 63 | #else |
| 64 | #define Dprintk(x...) |
| 65 | #endif |
| 66 | |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 67 | #ifdef CONFIG_HOTPLUG_CPU |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 68 | #ifdef CONFIG_PERMIT_BSP_REMOVE |
| 69 | #define bsp_remove_ok 1 |
| 70 | #else |
| 71 | #define bsp_remove_ok 0 |
| 72 | #endif |
| 73 | |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 74 | /* |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 75 | * Global array allocated for NR_CPUS at boot time |
| 76 | */ |
| 77 | struct sal_to_os_boot sal_boot_rendez_state[NR_CPUS]; |
| 78 | |
| 79 | /* |
| 80 | * start_ap in head.S uses this to store current booting cpu |
| 81 | * info. |
| 82 | */ |
| 83 | struct sal_to_os_boot *sal_state_for_booting_cpu = &sal_boot_rendez_state[0]; |
| 84 | |
| 85 | #define set_brendez_area(x) (sal_state_for_booting_cpu = &sal_boot_rendez_state[(x)]); |
| 86 | |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 87 | #else |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 88 | #define set_brendez_area(x) |
| 89 | #endif |
| 90 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 91 | |
| 92 | /* |
| 93 | * ITC synchronization related stuff: |
| 94 | */ |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 95 | #define MASTER (0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | #define SLAVE (SMP_CACHE_BYTES/8) |
| 97 | |
| 98 | #define NUM_ROUNDS 64 /* magic value */ |
| 99 | #define NUM_ITERS 5 /* likewise */ |
| 100 | |
| 101 | static DEFINE_SPINLOCK(itc_sync_lock); |
| 102 | static volatile unsigned long go[SLAVE + 1]; |
| 103 | |
| 104 | #define DEBUG_ITC_SYNC 0 |
| 105 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | extern void start_ap (void); |
| 107 | extern unsigned long ia64_iobase; |
| 108 | |
Ingo Molnar | 36c8b58 | 2006-07-03 00:25:41 -0700 | [diff] [blame] | 109 | struct task_struct *task_for_booting_cpu; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | |
| 111 | /* |
| 112 | * State for each CPU |
| 113 | */ |
| 114 | DEFINE_PER_CPU(int, cpu_state); |
| 115 | |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 116 | cpumask_t cpu_core_map[NR_CPUS] __cacheline_aligned; |
Robin Holt | 42aca48 | 2008-07-28 20:36:50 -0500 | [diff] [blame] | 117 | EXPORT_SYMBOL(cpu_core_map); |
Mike Travis | d5a7430 | 2007-10-16 01:24:05 -0700 | [diff] [blame] | 118 | DEFINE_PER_CPU_SHARED_ALIGNED(cpumask_t, cpu_sibling_map); |
| 119 | EXPORT_PER_CPU_SYMBOL(cpu_sibling_map); |
| 120 | |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 121 | int smp_num_siblings = 1; |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 122 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | /* which logical CPU number maps to which CPU (physical APIC ID) */ |
| 124 | volatile int ia64_cpu_to_sapicid[NR_CPUS]; |
| 125 | EXPORT_SYMBOL(ia64_cpu_to_sapicid); |
| 126 | |
Rusty Russell | 5eda786 | 2015-06-01 15:53:53 +0930 | [diff] [blame] | 127 | static cpumask_t cpu_callin_map; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | |
| 129 | struct smp_boot_data smp_boot_data __initdata; |
| 130 | |
| 131 | unsigned long ap_wakeup_vector = -1; /* External Int use to wakeup APs */ |
| 132 | |
| 133 | char __initdata no_int_routing; |
| 134 | |
| 135 | unsigned char smp_int_redirect; /* are INT and IPI redirectable by the chipset? */ |
| 136 | |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 137 | #ifdef CONFIG_FORCE_CPEI_RETARGET |
| 138 | #define CPEI_OVERRIDE_DEFAULT (1) |
| 139 | #else |
| 140 | #define CPEI_OVERRIDE_DEFAULT (0) |
| 141 | #endif |
| 142 | |
| 143 | unsigned int force_cpei_retarget = CPEI_OVERRIDE_DEFAULT; |
| 144 | |
| 145 | static int __init |
| 146 | cmdl_force_cpei(char *str) |
| 147 | { |
| 148 | int value=0; |
| 149 | |
| 150 | get_option (&str, &value); |
| 151 | force_cpei_retarget = value; |
| 152 | |
| 153 | return 1; |
| 154 | } |
| 155 | |
| 156 | __setup("force_cpei=", cmdl_force_cpei); |
| 157 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 158 | static int __init |
| 159 | nointroute (char *str) |
| 160 | { |
| 161 | no_int_routing = 1; |
| 162 | printk ("no_int_routing on\n"); |
| 163 | return 1; |
| 164 | } |
| 165 | |
| 166 | __setup("nointroute", nointroute); |
| 167 | |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 168 | static void fix_b0_for_bsp(void) |
| 169 | { |
| 170 | #ifdef CONFIG_HOTPLUG_CPU |
| 171 | int cpuid; |
| 172 | static int fix_bsp_b0 = 1; |
| 173 | |
| 174 | cpuid = smp_processor_id(); |
| 175 | |
| 176 | /* |
| 177 | * Cache the b0 value on the first AP that comes up |
| 178 | */ |
| 179 | if (!(fix_bsp_b0 && cpuid)) |
| 180 | return; |
| 181 | |
| 182 | sal_boot_rendez_state[0].br[0] = sal_boot_rendez_state[cpuid].br[0]; |
| 183 | printk ("Fixed BSP b0 value from CPU %d\n", cpuid); |
| 184 | |
| 185 | fix_bsp_b0 = 0; |
| 186 | #endif |
| 187 | } |
| 188 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | void |
| 190 | sync_master (void *arg) |
| 191 | { |
| 192 | unsigned long flags, i; |
| 193 | |
| 194 | go[MASTER] = 0; |
| 195 | |
| 196 | local_irq_save(flags); |
| 197 | { |
| 198 | for (i = 0; i < NUM_ROUNDS*NUM_ITERS; ++i) { |
David Mosberger-Tang | 82975115 | 2005-04-25 11:44:02 -0700 | [diff] [blame] | 199 | while (!go[MASTER]) |
| 200 | cpu_relax(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 201 | go[MASTER] = 0; |
| 202 | go[SLAVE] = ia64_get_itc(); |
| 203 | } |
| 204 | } |
| 205 | local_irq_restore(flags); |
| 206 | } |
| 207 | |
| 208 | /* |
| 209 | * Return the number of cycles by which our itc differs from the itc on the master |
| 210 | * (time-keeper) CPU. A positive number indicates our itc is ahead of the master, |
| 211 | * negative that it is behind. |
| 212 | */ |
| 213 | static inline long |
| 214 | get_delta (long *rt, long *master) |
| 215 | { |
| 216 | unsigned long best_t0 = 0, best_t1 = ~0UL, best_tm = 0; |
| 217 | unsigned long tcenter, t0, t1, tm; |
| 218 | long i; |
| 219 | |
| 220 | for (i = 0; i < NUM_ITERS; ++i) { |
| 221 | t0 = ia64_get_itc(); |
| 222 | go[MASTER] = 1; |
David Mosberger-Tang | 82975115 | 2005-04-25 11:44:02 -0700 | [diff] [blame] | 223 | while (!(tm = go[SLAVE])) |
| 224 | cpu_relax(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | go[SLAVE] = 0; |
| 226 | t1 = ia64_get_itc(); |
| 227 | |
| 228 | if (t1 - t0 < best_t1 - best_t0) |
| 229 | best_t0 = t0, best_t1 = t1, best_tm = tm; |
| 230 | } |
| 231 | |
| 232 | *rt = best_t1 - best_t0; |
| 233 | *master = best_tm - best_t0; |
| 234 | |
| 235 | /* average best_t0 and best_t1 without overflow: */ |
| 236 | tcenter = (best_t0/2 + best_t1/2); |
| 237 | if (best_t0 % 2 + best_t1 % 2 == 2) |
| 238 | ++tcenter; |
| 239 | return tcenter - best_tm; |
| 240 | } |
| 241 | |
| 242 | /* |
| 243 | * Synchronize ar.itc of the current (slave) CPU with the ar.itc of the MASTER CPU |
| 244 | * (normally the time-keeper CPU). We use a closed loop to eliminate the possibility of |
| 245 | * unaccounted-for errors (such as getting a machine check in the middle of a calibration |
| 246 | * step). The basic idea is for the slave to ask the master what itc value it has and to |
| 247 | * read its own itc before and after the master responds. Each iteration gives us three |
| 248 | * timestamps: |
| 249 | * |
| 250 | * slave master |
| 251 | * |
| 252 | * t0 ---\ |
| 253 | * ---\ |
| 254 | * ---> |
| 255 | * tm |
| 256 | * /--- |
| 257 | * /--- |
| 258 | * t1 <--- |
| 259 | * |
| 260 | * |
| 261 | * The goal is to adjust the slave's ar.itc such that tm falls exactly half-way between t0 |
| 262 | * and t1. If we achieve this, the clocks are synchronized provided the interconnect |
| 263 | * between the slave and the master is symmetric. Even if the interconnect were |
| 264 | * asymmetric, we would still know that the synchronization error is smaller than the |
| 265 | * roundtrip latency (t0 - t1). |
| 266 | * |
| 267 | * When the interconnect is quiet and symmetric, this lets us synchronize the itc to |
| 268 | * within one or two cycles. However, we can only *guarantee* that the synchronization is |
| 269 | * accurate to within a round-trip time, which is typically in the range of several |
| 270 | * hundred cycles (e.g., ~500 cycles). In practice, this means that the itc's are usually |
| 271 | * almost perfectly synchronized, but we shouldn't assume that the accuracy is much better |
| 272 | * than half a micro second or so. |
| 273 | */ |
| 274 | void |
| 275 | ia64_sync_itc (unsigned int master) |
| 276 | { |
| 277 | long i, delta, adj, adjust_latency = 0, done = 0; |
| 278 | unsigned long flags, rt, master_time_stamp, bound; |
| 279 | #if DEBUG_ITC_SYNC |
| 280 | struct { |
| 281 | long rt; /* roundtrip time */ |
| 282 | long master; /* master's timestamp */ |
| 283 | long diff; /* difference between midpoint and master's timestamp */ |
| 284 | long lat; /* estimate of itc adjustment latency */ |
| 285 | } t[NUM_ROUNDS]; |
| 286 | #endif |
| 287 | |
| 288 | /* |
| 289 | * Make sure local timer ticks are disabled while we sync. If |
| 290 | * they were enabled, we'd have to worry about nasty issues |
| 291 | * like setting the ITC ahead of (or a long time before) the |
| 292 | * next scheduled tick. |
| 293 | */ |
| 294 | BUG_ON((ia64_get_itv() & (1 << 16)) == 0); |
| 295 | |
| 296 | go[MASTER] = 1; |
| 297 | |
Jens Axboe | 8691e5a | 2008-06-06 11:18:06 +0200 | [diff] [blame] | 298 | if (smp_call_function_single(master, sync_master, NULL, 0) < 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 299 | printk(KERN_ERR "sync_itc: failed to get attention of CPU %u!\n", master); |
| 300 | return; |
| 301 | } |
| 302 | |
David Mosberger-Tang | 82975115 | 2005-04-25 11:44:02 -0700 | [diff] [blame] | 303 | while (go[MASTER]) |
| 304 | cpu_relax(); /* wait for master to be ready */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | |
| 306 | spin_lock_irqsave(&itc_sync_lock, flags); |
| 307 | { |
| 308 | for (i = 0; i < NUM_ROUNDS; ++i) { |
| 309 | delta = get_delta(&rt, &master_time_stamp); |
| 310 | if (delta == 0) { |
| 311 | done = 1; /* let's lock on to this... */ |
| 312 | bound = rt; |
| 313 | } |
| 314 | |
| 315 | if (!done) { |
| 316 | if (i > 0) { |
| 317 | adjust_latency += -delta; |
| 318 | adj = -delta + adjust_latency/4; |
| 319 | } else |
| 320 | adj = -delta; |
| 321 | |
| 322 | ia64_set_itc(ia64_get_itc() + adj); |
| 323 | } |
| 324 | #if DEBUG_ITC_SYNC |
| 325 | t[i].rt = rt; |
| 326 | t[i].master = master_time_stamp; |
| 327 | t[i].diff = delta; |
| 328 | t[i].lat = adjust_latency/4; |
| 329 | #endif |
| 330 | } |
| 331 | } |
| 332 | spin_unlock_irqrestore(&itc_sync_lock, flags); |
| 333 | |
| 334 | #if DEBUG_ITC_SYNC |
| 335 | for (i = 0; i < NUM_ROUNDS; ++i) |
| 336 | printk("rt=%5ld master=%5ld diff=%5ld adjlat=%5ld\n", |
| 337 | t[i].rt, t[i].master, t[i].diff, t[i].lat); |
| 338 | #endif |
| 339 | |
| 340 | printk(KERN_INFO "CPU %d: synchronized ITC with CPU %u (last diff %ld cycles, " |
| 341 | "maxerr %lu cycles)\n", smp_processor_id(), master, delta, rt); |
| 342 | } |
| 343 | |
| 344 | /* |
| 345 | * Ideally sets up per-cpu profiling hooks. Doesn't do much now... |
| 346 | */ |
Greg Kroah-Hartman | 5b5e76e | 2012-12-21 14:05:13 -0800 | [diff] [blame] | 347 | static inline void smp_setup_percpu_timer(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | { |
| 349 | } |
| 350 | |
Paul Gortmaker | ccce9bb | 2013-06-17 15:51:20 -0400 | [diff] [blame] | 351 | static void |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | smp_callin (void) |
| 353 | { |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 354 | int cpuid, phys_id, itc_master; |
Jack Steiner | ead6caa | 2007-03-27 14:30:19 -0500 | [diff] [blame] | 355 | struct cpuinfo_ia64 *last_cpuinfo, *this_cpuinfo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | extern void ia64_init_itm(void); |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 357 | extern volatile int time_keeper_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | cpuid = smp_processor_id(); |
| 360 | phys_id = hard_smp_processor_id(); |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 361 | itc_master = time_keeper_id; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | |
| 363 | if (cpu_online(cpuid)) { |
| 364 | printk(KERN_ERR "huh, phys CPU#0x%x, CPU#0x%x already present??\n", |
| 365 | phys_id, cpuid); |
| 366 | BUG(); |
| 367 | } |
| 368 | |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 369 | fix_b0_for_bsp(); |
| 370 | |
Lee Schermerhorn | 3bccd99 | 2010-05-26 14:44:59 -0700 | [diff] [blame] | 371 | /* |
| 372 | * numa_node_id() works after this. |
| 373 | */ |
| 374 | set_numa_node(cpu_to_node_map[cpuid]); |
Lee Schermerhorn | fd1197f | 2010-05-26 14:45:01 -0700 | [diff] [blame] | 375 | set_numa_mem(local_memory_node(cpu_to_node_map[cpuid])); |
Lee Schermerhorn | 3bccd99 | 2010-05-26 14:44:59 -0700 | [diff] [blame] | 376 | |
Yasuaki Ishimatsu | e1b30a3 | 2007-07-17 21:22:23 +0900 | [diff] [blame] | 377 | spin_lock(&vector_lock); |
| 378 | /* Setup the per cpu irq handling data structures */ |
| 379 | __setup_vector_irq(cpuid); |
Manfred Spraul | e545a61 | 2008-09-07 16:57:22 +0200 | [diff] [blame] | 380 | notify_cpu_starting(cpuid); |
Srivatsa S. Bhat | 7d7f984 | 2012-03-28 14:42:46 -0700 | [diff] [blame] | 381 | set_cpu_online(cpuid, true); |
Shaohua Li | a9fa06c2 | 2005-06-25 14:55:05 -0700 | [diff] [blame] | 382 | per_cpu(cpu_state, cpuid) = CPU_ONLINE; |
Yasuaki Ishimatsu | e1b30a3 | 2007-07-17 21:22:23 +0900 | [diff] [blame] | 383 | spin_unlock(&vector_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | |
| 385 | smp_setup_percpu_timer(); |
| 386 | |
| 387 | ia64_mca_cmc_vector_setup(); /* Setup vector on AP */ |
| 388 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | local_irq_enable(); |
| 390 | |
| 391 | if (!(sal_platform_features & IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT)) { |
| 392 | /* |
| 393 | * Synchronize the ITC with the BP. Need to do this after irqs are |
| 394 | * enabled because ia64_sync_itc() calls smp_call_function_single(), which |
| 395 | * calls spin_unlock_bh(), which calls spin_unlock_bh(), which calls |
| 396 | * local_bh_enable(), which bugs out if irqs are not enabled... |
| 397 | */ |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 398 | Dprintk("Going to syncup ITC with ITC Master.\n"); |
| 399 | ia64_sync_itc(itc_master); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | } |
| 401 | |
| 402 | /* |
| 403 | * Get our bogomips. |
| 404 | */ |
| 405 | ia64_init_itm(); |
Jack Steiner | ead6caa | 2007-03-27 14:30:19 -0500 | [diff] [blame] | 406 | |
| 407 | /* |
| 408 | * Delay calibration can be skipped if new processor is identical to the |
| 409 | * previous processor. |
| 410 | */ |
| 411 | last_cpuinfo = cpu_data(cpuid - 1); |
| 412 | this_cpuinfo = local_cpu_data; |
| 413 | if (last_cpuinfo->itc_freq != this_cpuinfo->itc_freq || |
| 414 | last_cpuinfo->proc_freq != this_cpuinfo->proc_freq || |
| 415 | last_cpuinfo->features != this_cpuinfo->features || |
| 416 | last_cpuinfo->revision != this_cpuinfo->revision || |
| 417 | last_cpuinfo->family != this_cpuinfo->family || |
| 418 | last_cpuinfo->archrev != this_cpuinfo->archrev || |
| 419 | last_cpuinfo->model != this_cpuinfo->model) |
| 420 | calibrate_delay(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 421 | local_cpu_data->loops_per_jiffy = loops_per_jiffy; |
| 422 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | /* |
| 424 | * Allow the master to continue. |
| 425 | */ |
Rusty Russell | 5d2068d | 2015-03-05 10:49:16 +1030 | [diff] [blame] | 426 | cpumask_set_cpu(cpuid, &cpu_callin_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | Dprintk("Stack on CPU %d at about %p\n",cpuid, &cpuid); |
| 428 | } |
| 429 | |
| 430 | |
| 431 | /* |
| 432 | * Activate a secondary processor. head.S calls this. |
| 433 | */ |
Paul Gortmaker | ccce9bb | 2013-06-17 15:51:20 -0400 | [diff] [blame] | 434 | int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 435 | start_secondary (void *unused) |
| 436 | { |
| 437 | /* Early console may use I/O ports */ |
| 438 | ia64_set_kr(IA64_KR_IO_BASE, __pa(ia64_iobase)); |
Tony Luck | 10617bb | 2008-08-12 10:34:20 -0700 | [diff] [blame] | 439 | #ifndef CONFIG_PRINTK_TIME |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | Dprintk("start_secondary: starting CPU 0x%x\n", hard_smp_processor_id()); |
Tony Luck | 10617bb | 2008-08-12 10:34:20 -0700 | [diff] [blame] | 441 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 442 | efi_map_pal_code(); |
| 443 | cpu_init(); |
| 444 | smp_callin(); |
| 445 | |
Thomas Gleixner | fc6d73d | 2016-02-26 18:43:40 +0000 | [diff] [blame] | 446 | cpu_startup_entry(CPUHP_AP_ONLINE_IDLE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | return 0; |
| 448 | } |
| 449 | |
Paul Gortmaker | ccce9bb | 2013-06-17 15:51:20 -0400 | [diff] [blame] | 450 | static int |
Thomas Gleixner | 13583bf | 2012-04-20 13:05:49 +0000 | [diff] [blame] | 451 | do_boot_cpu (int sapicid, int cpu, struct task_struct *idle) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | { |
| 453 | int timeout; |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 454 | |
Thomas Gleixner | 13583bf | 2012-04-20 13:05:49 +0000 | [diff] [blame] | 455 | task_for_booting_cpu = idle; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | Dprintk("Sending wakeup vector %lu to AP 0x%x/0x%x.\n", ap_wakeup_vector, cpu, sapicid); |
| 457 | |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 458 | set_brendez_area(cpu); |
Christoph Hellwig | 05933aa | 2019-08-13 09:25:02 +0200 | [diff] [blame] | 459 | ia64_send_ipi(cpu, ap_wakeup_vector, IA64_IPI_DM_INT, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 460 | |
| 461 | /* |
| 462 | * Wait 10s total for the AP to start |
| 463 | */ |
| 464 | Dprintk("Waiting on callin_map ..."); |
| 465 | for (timeout = 0; timeout < 100000; timeout++) { |
Rusty Russell | 5d2068d | 2015-03-05 10:49:16 +1030 | [diff] [blame] | 466 | if (cpumask_test_cpu(cpu, &cpu_callin_map)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 467 | break; /* It has booted */ |
Rusty Russell | 5eda786 | 2015-06-01 15:53:53 +0930 | [diff] [blame] | 468 | barrier(); /* Make sure we re-read cpu_callin_map */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | udelay(100); |
| 470 | } |
| 471 | Dprintk("\n"); |
| 472 | |
Rusty Russell | 5d2068d | 2015-03-05 10:49:16 +1030 | [diff] [blame] | 473 | if (!cpumask_test_cpu(cpu, &cpu_callin_map)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 474 | printk(KERN_ERR "Processor 0x%x/0x%x is stuck.\n", cpu, sapicid); |
| 475 | ia64_cpu_to_sapicid[cpu] = -1; |
Srivatsa S. Bhat | 7d7f984 | 2012-03-28 14:42:46 -0700 | [diff] [blame] | 476 | set_cpu_online(cpu, false); /* was set in smp_callin() */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | return -EINVAL; |
| 478 | } |
| 479 | return 0; |
| 480 | } |
| 481 | |
| 482 | static int __init |
| 483 | decay (char *str) |
| 484 | { |
| 485 | int ticks; |
| 486 | get_option (&str, &ticks); |
| 487 | return 1; |
| 488 | } |
| 489 | |
| 490 | __setup("decay=", decay); |
| 491 | |
| 492 | /* |
| 493 | * Initialize the logical CPU number to SAPICID mapping |
| 494 | */ |
| 495 | void __init |
| 496 | smp_build_cpu_map (void) |
| 497 | { |
| 498 | int sapicid, cpu, i; |
| 499 | int boot_cpu_id = hard_smp_processor_id(); |
| 500 | |
| 501 | for (cpu = 0; cpu < NR_CPUS; cpu++) { |
| 502 | ia64_cpu_to_sapicid[cpu] = -1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | } |
| 504 | |
| 505 | ia64_cpu_to_sapicid[0] = boot_cpu_id; |
Srivatsa S. Bhat | 7d7f984 | 2012-03-28 14:42:46 -0700 | [diff] [blame] | 506 | init_cpu_present(cpumask_of(0)); |
Rusty Russell | 2af51a3 | 2009-03-16 14:12:43 +1030 | [diff] [blame] | 507 | set_cpu_possible(0, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | for (cpu = 1, i = 0; i < smp_boot_data.cpu_count; i++) { |
| 509 | sapicid = smp_boot_data.cpu_phys_id[i]; |
| 510 | if (sapicid == boot_cpu_id) |
| 511 | continue; |
Rusty Russell | 2af51a3 | 2009-03-16 14:12:43 +1030 | [diff] [blame] | 512 | set_cpu_present(cpu, true); |
| 513 | set_cpu_possible(cpu, true); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 514 | ia64_cpu_to_sapicid[cpu] = sapicid; |
| 515 | cpu++; |
| 516 | } |
| 517 | } |
| 518 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | /* |
| 520 | * Cycle through the APs sending Wakeup IPIs to boot each. |
| 521 | */ |
| 522 | void __init |
| 523 | smp_prepare_cpus (unsigned int max_cpus) |
| 524 | { |
| 525 | int boot_cpu_id = hard_smp_processor_id(); |
| 526 | |
| 527 | /* |
| 528 | * Initialize the per-CPU profiling counter/multiplier |
| 529 | */ |
| 530 | |
| 531 | smp_setup_percpu_timer(); |
| 532 | |
Rusty Russell | 5d2068d | 2015-03-05 10:49:16 +1030 | [diff] [blame] | 533 | cpumask_set_cpu(0, &cpu_callin_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | |
| 535 | local_cpu_data->loops_per_jiffy = loops_per_jiffy; |
| 536 | ia64_cpu_to_sapicid[0] = boot_cpu_id; |
| 537 | |
| 538 | printk(KERN_INFO "Boot processor id 0x%x/0x%x\n", 0, boot_cpu_id); |
| 539 | |
| 540 | current_thread_info()->cpu = 0; |
| 541 | |
| 542 | /* |
| 543 | * If SMP should be disabled, then really disable it! |
| 544 | */ |
| 545 | if (!max_cpus) { |
| 546 | printk(KERN_INFO "SMP mode deactivated.\n"); |
Rusty Russell | 2af51a3 | 2009-03-16 14:12:43 +1030 | [diff] [blame] | 547 | init_cpu_online(cpumask_of(0)); |
| 548 | init_cpu_present(cpumask_of(0)); |
| 549 | init_cpu_possible(cpumask_of(0)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | return; |
| 551 | } |
| 552 | } |
| 553 | |
Greg Kroah-Hartman | 5b5e76e | 2012-12-21 14:05:13 -0800 | [diff] [blame] | 554 | void smp_prepare_boot_cpu(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | { |
Srivatsa S. Bhat | 7d7f984 | 2012-03-28 14:42:46 -0700 | [diff] [blame] | 556 | set_cpu_online(smp_processor_id(), true); |
Rusty Russell | 5d2068d | 2015-03-05 10:49:16 +1030 | [diff] [blame] | 557 | cpumask_set_cpu(smp_processor_id(), &cpu_callin_map); |
Lee Schermerhorn | 3bccd99 | 2010-05-26 14:44:59 -0700 | [diff] [blame] | 558 | set_numa_node(cpu_to_node_map[smp_processor_id()]); |
Shaohua Li | a9fa06c2 | 2005-06-25 14:55:05 -0700 | [diff] [blame] | 559 | per_cpu(cpu_state, smp_processor_id()) = CPU_ONLINE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | } |
| 561 | |
| 562 | #ifdef CONFIG_HOTPLUG_CPU |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 563 | static inline void |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 564 | clear_cpu_sibling_map(int cpu) |
| 565 | { |
| 566 | int i; |
| 567 | |
Rusty Russell | 5d2068d | 2015-03-05 10:49:16 +1030 | [diff] [blame] | 568 | for_each_cpu(i, &per_cpu(cpu_sibling_map, cpu)) |
| 569 | cpumask_clear_cpu(cpu, &per_cpu(cpu_sibling_map, i)); |
| 570 | for_each_cpu(i, &cpu_core_map[cpu]) |
| 571 | cpumask_clear_cpu(cpu, &cpu_core_map[i]); |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 572 | |
Mike Travis | d5a7430 | 2007-10-16 01:24:05 -0700 | [diff] [blame] | 573 | 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] | 574 | } |
| 575 | |
| 576 | static void |
| 577 | remove_siblinginfo(int cpu) |
| 578 | { |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 579 | if (cpu_data(cpu)->threads_per_core == 1 && |
| 580 | cpu_data(cpu)->cores_per_socket == 1) { |
Rusty Russell | 5d2068d | 2015-03-05 10:49:16 +1030 | [diff] [blame] | 581 | cpumask_clear_cpu(cpu, &cpu_core_map[cpu]); |
| 582 | cpumask_clear_cpu(cpu, &per_cpu(cpu_sibling_map, cpu)); |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 583 | return; |
| 584 | } |
| 585 | |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 586 | /* remove it from all sibling map's */ |
| 587 | clear_cpu_sibling_map(cpu); |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 588 | } |
| 589 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 590 | extern void fixup_irqs(void); |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 591 | |
| 592 | int migrate_platform_irqs(unsigned int cpu) |
| 593 | { |
| 594 | int new_cpei_cpu; |
Thomas Gleixner | 097e98b | 2011-03-25 19:00:33 +0100 | [diff] [blame] | 595 | struct irq_data *data = NULL; |
Rusty Russell | 0de2652 | 2008-12-13 21:20:26 +1030 | [diff] [blame] | 596 | const struct cpumask *mask; |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 597 | int retval = 0; |
| 598 | |
| 599 | /* |
| 600 | * dont permit CPEI target to removed. |
| 601 | */ |
| 602 | if (cpe_vector > 0 && is_cpu_cpei_target(cpu)) { |
| 603 | printk ("CPU (%d) is CPEI Target\n", cpu); |
| 604 | if (can_cpei_retarget()) { |
| 605 | /* |
| 606 | * Now re-target the CPEI to a different processor |
| 607 | */ |
Srivatsa S. Bhat | 7d7f984 | 2012-03-28 14:42:46 -0700 | [diff] [blame] | 608 | new_cpei_cpu = cpumask_any(cpu_online_mask); |
Rusty Russell | 0de2652 | 2008-12-13 21:20:26 +1030 | [diff] [blame] | 609 | mask = cpumask_of(new_cpei_cpu); |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 610 | set_cpei_target_cpu(new_cpei_cpu); |
Thomas Gleixner | 097e98b | 2011-03-25 19:00:33 +0100 | [diff] [blame] | 611 | data = irq_get_irq_data(ia64_cpe_irq); |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 612 | /* |
Simon Arlott | 72fdbdc | 2007-05-11 14:55:43 -0700 | [diff] [blame] | 613 | * Switch for now, immediately, we need to do fake intr |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 614 | * as other interrupts, but need to study CPEI behaviour with |
| 615 | * polling before making changes. |
| 616 | */ |
Thomas Gleixner | 097e98b | 2011-03-25 19:00:33 +0100 | [diff] [blame] | 617 | if (data && data->chip) { |
| 618 | data->chip->irq_disable(data); |
| 619 | data->chip->irq_set_affinity(data, mask, false); |
| 620 | data->chip->irq_enable(data); |
Lucas De Marchi | 25985ed | 2011-03-30 22:57:33 -0300 | [diff] [blame] | 621 | printk ("Re-targeting CPEI to cpu %d\n", new_cpei_cpu); |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 622 | } |
| 623 | } |
Thomas Gleixner | 097e98b | 2011-03-25 19:00:33 +0100 | [diff] [blame] | 624 | if (!data) { |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 625 | printk ("Unable to retarget CPEI, offline cpu [%d] failed\n", cpu); |
| 626 | retval = -EBUSY; |
| 627 | } |
| 628 | } |
| 629 | return retval; |
| 630 | } |
| 631 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 632 | /* must be called with cpucontrol mutex held */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | int __cpu_disable(void) |
| 634 | { |
| 635 | int cpu = smp_processor_id(); |
| 636 | |
| 637 | /* |
| 638 | * dont permit boot processor for now |
| 639 | */ |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 640 | if (cpu == 0 && !bsp_remove_ok) { |
| 641 | printk ("Your platform does not support removal of BSP\n"); |
| 642 | return (-EBUSY); |
| 643 | } |
| 644 | |
Srivatsa S. Bhat | 7d7f984 | 2012-03-28 14:42:46 -0700 | [diff] [blame] | 645 | set_cpu_online(cpu, false); |
Alex Chiang | 66db2e6 | 2009-02-09 11:16:16 -0700 | [diff] [blame] | 646 | |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 647 | if (migrate_platform_irqs(cpu)) { |
Srivatsa S. Bhat | 7d7f984 | 2012-03-28 14:42:46 -0700 | [diff] [blame] | 648 | set_cpu_online(cpu, true); |
Alex Chiang | c0acdea | 2009-02-09 11:16:57 -0700 | [diff] [blame] | 649 | return -EBUSY; |
Ashok Raj | ff74190 | 2005-11-11 14:32:40 -0800 | [diff] [blame] | 650 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 652 | remove_siblinginfo(cpu); |
Alex Chiang | 66db2e6 | 2009-02-09 11:16:16 -0700 | [diff] [blame] | 653 | fixup_irqs(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | local_flush_tlb_all(); |
Rusty Russell | 5d2068d | 2015-03-05 10:49:16 +1030 | [diff] [blame] | 655 | cpumask_clear_cpu(cpu, &cpu_callin_map); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | return 0; |
| 657 | } |
| 658 | |
| 659 | void __cpu_die(unsigned int cpu) |
| 660 | { |
| 661 | unsigned int i; |
| 662 | |
| 663 | for (i = 0; i < 100; i++) { |
| 664 | /* They ack this in play_dead by setting CPU_DEAD */ |
| 665 | if (per_cpu(cpu_state, cpu) == CPU_DEAD) |
| 666 | { |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 667 | printk ("CPU %d is now offline\n", cpu); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | return; |
| 669 | } |
| 670 | msleep(100); |
| 671 | } |
| 672 | printk(KERN_ERR "CPU %u didn't die...\n", cpu); |
| 673 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 674 | #endif /* CONFIG_HOTPLUG_CPU */ |
| 675 | |
| 676 | void |
| 677 | smp_cpus_done (unsigned int dummy) |
| 678 | { |
| 679 | int cpu; |
| 680 | unsigned long bogosum = 0; |
| 681 | |
| 682 | /* |
| 683 | * Allow the user to impress friends. |
| 684 | */ |
| 685 | |
hawkes@sgi.com | dc565b5 | 2005-10-10 08:43:26 -0700 | [diff] [blame] | 686 | for_each_online_cpu(cpu) { |
| 687 | bogosum += cpu_data(cpu)->loops_per_jiffy; |
| 688 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 689 | |
| 690 | printk(KERN_INFO "Total of %d processors activated (%lu.%02lu BogoMIPS).\n", |
| 691 | (int)num_online_cpus(), bogosum/(500000/HZ), (bogosum/(5000/HZ))%100); |
| 692 | } |
| 693 | |
Greg Kroah-Hartman | 5b5e76e | 2012-12-21 14:05:13 -0800 | [diff] [blame] | 694 | static inline void set_cpu_sibling_map(int cpu) |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 695 | { |
| 696 | int i; |
| 697 | |
| 698 | for_each_online_cpu(i) { |
| 699 | if ((cpu_data(cpu)->socket_id == cpu_data(i)->socket_id)) { |
Rusty Russell | 5d2068d | 2015-03-05 10:49:16 +1030 | [diff] [blame] | 700 | cpumask_set_cpu(i, &cpu_core_map[cpu]); |
| 701 | cpumask_set_cpu(cpu, &cpu_core_map[i]); |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 702 | if (cpu_data(cpu)->core_id == cpu_data(i)->core_id) { |
Rusty Russell | 5d2068d | 2015-03-05 10:49:16 +1030 | [diff] [blame] | 703 | cpumask_set_cpu(i, |
| 704 | &per_cpu(cpu_sibling_map, cpu)); |
| 705 | cpumask_set_cpu(cpu, |
| 706 | &per_cpu(cpu_sibling_map, i)); |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 707 | } |
| 708 | } |
| 709 | } |
| 710 | } |
| 711 | |
Paul Gortmaker | ccce9bb | 2013-06-17 15:51:20 -0400 | [diff] [blame] | 712 | int |
Thomas Gleixner | 8239c25 | 2012-04-20 13:05:42 +0000 | [diff] [blame] | 713 | __cpu_up(unsigned int cpu, struct task_struct *tidle) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | { |
| 715 | int ret; |
| 716 | int sapicid; |
| 717 | |
| 718 | sapicid = ia64_cpu_to_sapicid[cpu]; |
| 719 | if (sapicid == -1) |
| 720 | return -EINVAL; |
| 721 | |
| 722 | /* |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 723 | * Already booted cpu? not valid anymore since we dont |
| 724 | * do idle loop tightspin anymore. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | */ |
Rusty Russell | 5d2068d | 2015-03-05 10:49:16 +1030 | [diff] [blame] | 726 | if (cpumask_test_cpu(cpu, &cpu_callin_map)) |
Ashok Raj | b8d8b88 | 2005-04-22 14:44:40 -0700 | [diff] [blame] | 727 | return -EINVAL; |
| 728 | |
Shaohua Li | a9fa06c2 | 2005-06-25 14:55:05 -0700 | [diff] [blame] | 729 | per_cpu(cpu_state, cpu) = CPU_UP_PREPARE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 730 | /* Processor goes to start_secondary(), sets online flag */ |
Thomas Gleixner | 13583bf | 2012-04-20 13:05:49 +0000 | [diff] [blame] | 731 | ret = do_boot_cpu(sapicid, cpu, tidle); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | if (ret < 0) |
| 733 | return ret; |
| 734 | |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 735 | if (cpu_data(cpu)->threads_per_core == 1 && |
| 736 | cpu_data(cpu)->cores_per_socket == 1) { |
Rusty Russell | 5d2068d | 2015-03-05 10:49:16 +1030 | [diff] [blame] | 737 | cpumask_set_cpu(cpu, &per_cpu(cpu_sibling_map, cpu)); |
| 738 | cpumask_set_cpu(cpu, &cpu_core_map[cpu]); |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 739 | return 0; |
| 740 | } |
| 741 | |
| 742 | set_cpu_sibling_map(cpu); |
| 743 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 744 | return 0; |
| 745 | } |
| 746 | |
| 747 | /* |
Simon Arlott | 72fdbdc | 2007-05-11 14:55:43 -0700 | [diff] [blame] | 748 | * Assume that CPUs have been discovered by some platform-dependent interface. For |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 749 | * SoftSDV/Lion, that would be ACPI. |
| 750 | * |
| 751 | * Setup of the IPI irq handler is done in irq.c:init_IRQ_SMP(). |
| 752 | */ |
| 753 | void __init |
| 754 | init_smp_config(void) |
| 755 | { |
| 756 | struct fptr { |
| 757 | unsigned long fp; |
| 758 | unsigned long gp; |
| 759 | } *ap_startup; |
| 760 | long sal_ret; |
| 761 | |
Simon Arlott | 72fdbdc | 2007-05-11 14:55:43 -0700 | [diff] [blame] | 762 | /* Tell SAL where to drop the APs. */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 763 | ap_startup = (struct fptr *) start_ap; |
| 764 | sal_ret = ia64_sal_set_vectors(SAL_VECTOR_OS_BOOT_RENDEZ, |
| 765 | ia64_tpa(ap_startup->fp), ia64_tpa(ap_startup->gp), 0, 0, 0, 0); |
| 766 | if (sal_ret < 0) |
| 767 | printk(KERN_ERR "SMP: Can't set SAL AP Boot Rendezvous: %s\n", |
| 768 | ia64_sal_strerror(sal_ret)); |
| 769 | } |
| 770 | |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 771 | /* |
| 772 | * identify_siblings(cpu) gets called from identify_cpu. This populates the |
| 773 | * information related to logical execution units in per_cpu_data structure. |
| 774 | */ |
Greg Kroah-Hartman | 5b5e76e | 2012-12-21 14:05:13 -0800 | [diff] [blame] | 775 | void identify_siblings(struct cpuinfo_ia64 *c) |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 776 | { |
Matthew Wilcox | e088a4a | 2009-05-22 13:49:49 -0700 | [diff] [blame] | 777 | long status; |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 778 | u16 pltid; |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 779 | pal_logical_to_physical_t info; |
| 780 | |
Alex Chiang | 6ff0bc9 | 2008-04-24 12:57:08 -0600 | [diff] [blame] | 781 | status = ia64_pal_logical_to_phys(-1, &info); |
| 782 | if (status != PAL_STATUS_SUCCESS) { |
Alex Chiang | 113134f | 2007-10-19 13:20:09 -0600 | [diff] [blame] | 783 | if (status != PAL_STATUS_UNIMPLEMENTED) { |
| 784 | printk(KERN_ERR |
| 785 | "ia64_pal_logical_to_phys failed with %ld\n", |
| 786 | status); |
| 787 | return; |
| 788 | } |
| 789 | |
| 790 | info.overview_ppid = 0; |
| 791 | info.overview_cpp = 1; |
| 792 | info.overview_tpc = 1; |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 793 | } |
Alex Chiang | 6ff0bc9 | 2008-04-24 12:57:08 -0600 | [diff] [blame] | 794 | |
| 795 | status = ia64_sal_physical_id_info(&pltid); |
| 796 | if (status != PAL_STATUS_SUCCESS) { |
| 797 | if (status != PAL_STATUS_UNIMPLEMENTED) |
| 798 | printk(KERN_ERR |
| 799 | "ia64_sal_pltid failed with %ld\n", |
| 800 | status); |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 801 | return; |
| 802 | } |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 803 | |
| 804 | c->socket_id = (pltid << 8) | info.overview_ppid; |
Alex Chiang | 113134f | 2007-10-19 13:20:09 -0600 | [diff] [blame] | 805 | |
| 806 | if (info.overview_cpp == 1 && info.overview_tpc == 1) |
| 807 | return; |
| 808 | |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 809 | c->cores_per_socket = info.overview_cpp; |
| 810 | c->threads_per_core = info.overview_tpc; |
Fenghua Yu | 4129a95 | 2006-02-27 16:16:22 -0800 | [diff] [blame] | 811 | c->num_log = info.overview_num_log; |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 812 | |
Fenghua Yu | 4129a95 | 2006-02-27 16:16:22 -0800 | [diff] [blame] | 813 | c->core_id = info.log1_cid; |
| 814 | c->thread_id = info.log1_tid; |
Suresh Siddha | e927ecb | 2005-04-25 13:25:06 -0700 | [diff] [blame] | 815 | } |
Stephane Eranian | dd562c0 | 2006-09-21 10:35:44 -0700 | [diff] [blame] | 816 | |
| 817 | /* |
| 818 | * returns non zero, if multi-threading is enabled |
| 819 | * on at least one physical package. Due to hotplug cpu |
| 820 | * and (maxcpus=), all threads may not necessarily be enabled |
| 821 | * even though the processor supports multi-threading. |
| 822 | */ |
| 823 | int is_multithreading_enabled(void) |
| 824 | { |
| 825 | int i, j; |
| 826 | |
| 827 | for_each_present_cpu(i) { |
| 828 | for_each_present_cpu(j) { |
| 829 | if (j == i) |
| 830 | continue; |
| 831 | if ((cpu_data(j)->socket_id == cpu_data(i)->socket_id)) { |
| 832 | if (cpu_data(j)->core_id == cpu_data(i)->core_id) |
| 833 | return 1; |
| 834 | } |
| 835 | } |
| 836 | } |
| 837 | return 0; |
| 838 | } |
| 839 | EXPORT_SYMBOL_GPL(is_multithreading_enabled); |