arch/powerpc/platforms/powernv/setup.c

   1 /*
   2  * PowerNV setup code.
   3  *
   4  * Copyright 2011 IBM Corp.
   5  *
   6  * This program is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU General Public License
   8  * as published by the Free Software Foundation; either version
   9  * 2 of the License, or (at your option) any later version.
  10  */
  11
  12 #undef DEBUG
  13
  14 #include <linux/cpu.h>
  15 #include <linux/errno.h>
  16 #include <linux/sched.h>
  17 #include <linux/kernel.h>
  18 #include <linux/tty.h>
  19 #include <linux/reboot.h>
  20 #include <linux/init.h>
  21 #include <linux/console.h>
  22 #include <linux/delay.h>
  23 #include <linux/irq.h>
  24 #include <linux/seq_file.h>
  25 #include <linux/of.h>
  26 #include <linux/of_fdt.h>
  27 #include <linux/interrupt.h>
  28 #include <linux/bug.h>
  29 #include <linux/pci.h>
  30 #include <linux/cpufreq.h>
  31
  32 #include <asm/machdep.h>
  33 #include <asm/firmware.h>
  34 #include <asm/xics.h>
  35 #include <asm/xive.h>
  36 #include <asm/opal.h>
  37 #include <asm/kexec.h>
  38 #include <asm/smp.h>
  39 #include <asm/tm.h>
  40 #include <asm/setup.h>
  41 #include <asm/security_features.h>
  42
  43 #include "powernv.h"
  44
  45
  46 static bool fw_feature_is(const char *state, const char *name,
  47                           struct device_node *fw_features)
  48 {
  49         struct device_node *np;
  50         bool rc = false;
  51
  52         np = of_get_child_by_name(fw_features, name);
  53         if (np) {
  54                 rc = of_property_read_bool(np, state);
  55                 of_node_put(np);
  56         }
  57
  58         return rc;
  59 }
  60
  61 static void init_fw_feat_flags(struct device_node *np)
  62 {
  63         if (fw_feature_is("enabled", "inst-spec-barrier-ori31,31,0", np))
  64                 security_ftr_set(SEC_FTR_SPEC_BAR_ORI31);
  65
  66         if (fw_feature_is("enabled", "fw-bcctrl-serialized", np))
  67                 security_ftr_set(SEC_FTR_BCCTRL_SERIALISED);
  68
  69         if (fw_feature_is("enabled", "inst-l1d-flush-ori30,30,0", np))
  70                 security_ftr_set(SEC_FTR_L1D_FLUSH_ORI30);
  71
  72         if (fw_feature_is("enabled", "inst-l1d-flush-trig2", np))
  73                 security_ftr_set(SEC_FTR_L1D_FLUSH_TRIG2);
  74
  75         if (fw_feature_is("enabled", "fw-l1d-thread-split", np))
  76                 security_ftr_set(SEC_FTR_L1D_THREAD_PRIV);
  77
  78         if (fw_feature_is("enabled", "fw-count-cache-disabled", np))
  79                 security_ftr_set(SEC_FTR_COUNT_CACHE_DISABLED);
  80
  81         if (fw_feature_is("enabled", "fw-count-cache-flush-bcctr2,0,0", np))
  82                 security_ftr_set(SEC_FTR_BCCTR_FLUSH_ASSIST);
  83
  84         if (fw_feature_is("enabled", "needs-count-cache-flush-on-context-switch", np))
  85                 security_ftr_set(SEC_FTR_FLUSH_COUNT_CACHE);
  86
  87         /*
  88          * The features below are enabled by default, so we instead look to see
  89          * if firmware has *disabled* them, and clear them if so.
  90          */
  91         if (fw_feature_is("disabled", "speculation-policy-favor-security", np))
  92                 security_ftr_clear(SEC_FTR_FAVOUR_SECURITY);
  93
  94         if (fw_feature_is("disabled", "needs-l1d-flush-msr-pr-0-to-1", np))
  95                 security_ftr_clear(SEC_FTR_L1D_FLUSH_PR);
  96
  97         if (fw_feature_is("disabled", "needs-l1d-flush-msr-hv-1-to-0", np))
  98                 security_ftr_clear(SEC_FTR_L1D_FLUSH_HV);
  99
 100         if (fw_feature_is("disabled", "needs-spec-barrier-for-bound-checks", np))
 101                 security_ftr_clear(SEC_FTR_BNDS_CHK_SPEC_BAR);
 102 }
 103
 104 static void pnv_setup_rfi_flush(void)
 105 {
 106         struct device_node *np, *fw_features;
 107         enum l1d_flush_type type;
 108         bool enable;
 109
 110         /* Default to fallback in case fw-features are not available */
 111         type = L1D_FLUSH_FALLBACK;
 112
 113         np = of_find_node_by_name(NULL, "ibm,opal");
 114         fw_features = of_get_child_by_name(np, "fw-features");
 115         of_node_put(np);
 116
 117         if (fw_features) {
 118                 init_fw_feat_flags(fw_features);
 119                 of_node_put(fw_features);
 120
 121                 if (security_ftr_enabled(SEC_FTR_L1D_FLUSH_TRIG2))
 122                         type = L1D_FLUSH_MTTRIG;
 123
 124                 if (security_ftr_enabled(SEC_FTR_L1D_FLUSH_ORI30))
 125                         type = L1D_FLUSH_ORI;
 126         }
 127
 128         enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) && \
 129                  (security_ftr_enabled(SEC_FTR_L1D_FLUSH_PR)   || \
 130                   security_ftr_enabled(SEC_FTR_L1D_FLUSH_HV));
 131
 132         setup_rfi_flush(type, enable);
 133         setup_count_cache_flush();
 134 }
 135
 136 static void __init pnv_setup_arch(void)
 137 {
 138         set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
 139
 140         pnv_setup_rfi_flush();
 141         setup_stf_barrier();
 142
 143         /* Initialize SMP */
 144         pnv_smp_init();
 145
 146         /* Setup PCI */
 147         pnv_pci_init();
 148
 149         /* Setup RTC and NVRAM callbacks */
 150         if (firmware_has_feature(FW_FEATURE_OPAL))
 151                 opal_nvram_init();
 152
 153         /* Enable NAP mode */
 154         powersave_nap = 1;
 155
 156         /* XXX PMCS */
 157 }
 158
 159 static void __init pnv_init(void)
 160 {
 161         /*
 162          * Initialize the LPC bus now so that legacy serial
 163          * ports can be found on it
 164          */
 165         opal_lpc_init();
 166
 167 #ifdef CONFIG_HVC_OPAL
 168         if (firmware_has_feature(FW_FEATURE_OPAL))
 169                 hvc_opal_init_early();
 170         else
 171 #endif
 172                 add_preferred_console("hvc", 0, NULL);
 173 }
 174
 175 static void __init pnv_init_IRQ(void)
 176 {
 177         /* Try using a XIVE if available, otherwise use a XICS */
 178         if (!xive_native_init())
 179                 xics_init();
 180
 181         WARN_ON(!ppc_md.get_irq);
 182 }
 183
 184 static void pnv_show_cpuinfo(struct seq_file *m)
 185 {
 186         struct device_node *root;
 187         const char *model = "";
 188
 189         root = of_find_node_by_path("/");
 190         if (root)
 191                 model = of_get_property(root, "model", NULL);
 192         seq_printf(m, "machine\t\t: PowerNV %s\n", model);
 193         if (firmware_has_feature(FW_FEATURE_OPAL))
 194                 seq_printf(m, "firmware\t: OPAL\n");
 195         else
 196                 seq_printf(m, "firmware\t: BML\n");
 197         of_node_put(root);
 198         if (radix_enabled())
 199                 seq_printf(m, "MMU\t\t: Radix\n");
 200         else
 201                 seq_printf(m, "MMU\t\t: Hash\n");
 202 }
 203
 204 static void pnv_prepare_going_down(void)
 205 {
 206         /*
 207          * Disable all notifiers from OPAL, we can't
 208          * service interrupts anymore anyway
 209          */
 210         opal_event_shutdown();
 211
 212         /* Print flash update message if one is scheduled. */
 213         opal_flash_update_print_message();
 214
 215         smp_send_stop();
 216
 217         hard_irq_disable();
 218 }
 219
 220 static void  __noreturn pnv_restart(char *cmd)
 221 {
 222         long rc = OPAL_BUSY;
 223
 224         pnv_prepare_going_down();
 225
 226         while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
 227                 rc = opal_cec_reboot();
 228                 if (rc == OPAL_BUSY_EVENT)
 229                         opal_poll_events(NULL);
 230                 else
 231                         mdelay(10);
 232         }
 233         for (;;)
 234                 opal_poll_events(NULL);
 235 }
 236
 237 static void __noreturn pnv_power_off(void)
 238 {
 239         long rc = OPAL_BUSY;
 240
 241         pnv_prepare_going_down();
 242
 243         while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
 244                 rc = opal_cec_power_down(0);
 245                 if (rc == OPAL_BUSY_EVENT)
 246                         opal_poll_events(NULL);
 247                 else
 248                         mdelay(10);
 249         }
 250         for (;;)
 251                 opal_poll_events(NULL);
 252 }
 253
 254 static void __noreturn pnv_halt(void)
 255 {
 256         pnv_power_off();
 257 }
 258
 259 static void pnv_progress(char *s, unsigned short hex)
 260 {
 261 }
 262
 263 static void pnv_shutdown(void)
 264 {
 265         /* Let the PCI code clear up IODA tables */
 266         pnv_pci_shutdown();
 267
 268         /*
 269          * Stop OPAL activity: Unregister all OPAL interrupts so they
 270          * don't fire up while we kexec and make sure all potentially
 271          * DMA'ing ops are complete (such as dump retrieval).
 272          */
 273         opal_shutdown();
 274 }
 275
 276 #ifdef CONFIG_KEXEC_CORE
 277 static void pnv_kexec_wait_secondaries_down(void)
 278 {
 279         int my_cpu, i, notified = -1;
 280
 281         my_cpu = get_cpu();
 282
 283         for_each_online_cpu(i) {
 284                 uint8_t status;
 285                 int64_t rc, timeout = 1000;
 286
 287                 if (i == my_cpu)
 288                         continue;
 289
 290                 for (;;) {
 291                         rc = opal_query_cpu_status(get_hard_smp_processor_id(i),
 292                                                    &status);
 293                         if (rc != OPAL_SUCCESS || status != OPAL_THREAD_STARTED)
 294                                 break;
 295                         barrier();
 296                         if (i != notified) {
 297                                 printk(KERN_INFO "kexec: waiting for cpu %d "
 298                                        "(physical %d) to enter OPAL\n",
 299                                        i, paca_ptrs[i]->hw_cpu_id);
 300                                 notified = i;
 301                         }
 302
 303                         /*
 304                          * On crash secondaries might be unreachable or hung,
 305                          * so timeout if we've waited too long
 306                          * */
 307                         mdelay(1);
 308                         if (timeout-- == 0) {
 309                                 printk(KERN_ERR "kexec: timed out waiting for "
 310                                        "cpu %d (physical %d) to enter OPAL\n",
 311                                        i, paca_ptrs[i]->hw_cpu_id);
 312                                 break;
 313                         }
 314                 }
 315         }
 316 }
 317
 318 static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
 319 {
 320         u64 reinit_flags;
 321
 322         if (xive_enabled())
 323                 xive_teardown_cpu();
 324         else
 325                 xics_kexec_teardown_cpu(secondary);
 326
 327         /* On OPAL, we return all CPUs to firmware */
 328         if (!firmware_has_feature(FW_FEATURE_OPAL))
 329                 return;
 330
 331         if (secondary) {
 332                 /* Return secondary CPUs to firmware on OPAL v3 */
 333                 mb();
 334                 get_paca()->kexec_state = KEXEC_STATE_REAL_MODE;
 335                 mb();
 336
 337                 /* Return the CPU to OPAL */
 338                 opal_return_cpu();
 339         } else {
 340                 /* Primary waits for the secondaries to have reached OPAL */
 341                 pnv_kexec_wait_secondaries_down();
 342
 343                 /* Switch XIVE back to emulation mode */
 344                 if (xive_enabled())
 345                         xive_shutdown();
 346
 347                 /*
 348                  * We might be running as little-endian - now that interrupts
 349                  * are disabled, reset the HILE bit to big-endian so we don't
 350                  * take interrupts in the wrong endian later
 351                  *
 352                  * We reinit to enable both radix and hash on P9 to ensure
 353                  * the mode used by the next kernel is always supported.
 354                  */
 355                 reinit_flags = OPAL_REINIT_CPUS_HILE_BE;
 356                 if (cpu_has_feature(CPU_FTR_ARCH_300))
 357                         reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX |
 358                                 OPAL_REINIT_CPUS_MMU_HASH;
 359                 opal_reinit_cpus(reinit_flags);
 360         }
 361 }
 362 #endif /* CONFIG_KEXEC_CORE */
 363
 364 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
 365 static unsigned long pnv_memory_block_size(void)
 366 {
 367         return 256UL * 1024 * 1024;
 368 }
 369 #endif
 370
 371 static void __init pnv_setup_machdep_opal(void)
 372 {
 373         ppc_md.get_boot_time = opal_get_boot_time;
 374         ppc_md.restart = pnv_restart;
 375         pm_power_off = pnv_power_off;
 376         ppc_md.halt = pnv_halt;
 377         /* ppc_md.system_reset_exception gets filled in by pnv_smp_init() */
 378         ppc_md.machine_check_exception = opal_machine_check;
 379         ppc_md.mce_check_early_recovery = opal_mce_check_early_recovery;
 380         ppc_md.hmi_exception_early = opal_hmi_exception_early;
 381         ppc_md.handle_hmi_exception = opal_handle_hmi_exception;
 382 }
 383
 384 static int __init pnv_probe(void)
 385 {
 386         if (!of_machine_is_compatible("ibm,powernv"))
 387                 return 0;
 388
 389         if (firmware_has_feature(FW_FEATURE_OPAL))
 390                 pnv_setup_machdep_opal();
 391
 392         pr_debug("PowerNV detected !\n");
 393
 394         pnv_init();
 395
 396         return 1;
 397 }
 398
 399 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 400 void __init pnv_tm_init(void)
 401 {
 402         if (!firmware_has_feature(FW_FEATURE_OPAL) ||
 403             !pvr_version_is(PVR_POWER9) ||
 404             early_cpu_has_feature(CPU_FTR_TM))
 405                 return;
 406
 407         if (opal_reinit_cpus(OPAL_REINIT_CPUS_TM_SUSPEND_DISABLED) != OPAL_SUCCESS)
 408                 return;
 409
 410         pr_info("Enabling TM (Transactional Memory) with Suspend Disabled\n");
 411         cur_cpu_spec->cpu_features |= CPU_FTR_TM;
 412         /* Make sure "normal" HTM is off (it should be) */
 413         cur_cpu_spec->cpu_user_features2 &= ~PPC_FEATURE2_HTM;
 414         /* Turn on no suspend mode, and HTM no SC */
 415         cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_HTM_NO_SUSPEND | \
 416                                             PPC_FEATURE2_HTM_NOSC;
 417         tm_suspend_disabled = true;
 418 }
 419 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
 420
 421 /*
 422  * Returns the cpu frequency for 'cpu' in Hz. This is used by
 423  * /proc/cpuinfo
 424  */
 425 static unsigned long pnv_get_proc_freq(unsigned int cpu)
 426 {
 427         unsigned long ret_freq;
 428
 429         ret_freq = cpufreq_get(cpu) * 1000ul;
 430
 431         /*
 432          * If the backend cpufreq driver does not exist,
 433          * then fallback to old way of reporting the clockrate.
 434          */
 435         if (!ret_freq)
 436                 ret_freq = ppc_proc_freq;
 437         return ret_freq;
 438 }
 439
 440 define_machine(powernv) {
 441         .name                   = "PowerNV",
 442         .probe                  = pnv_probe,
 443         .setup_arch             = pnv_setup_arch,
 444         .init_IRQ               = pnv_init_IRQ,
 445         .show_cpuinfo           = pnv_show_cpuinfo,
 446         .get_proc_freq          = pnv_get_proc_freq,
 447         .progress               = pnv_progress,
 448         .machine_shutdown       = pnv_shutdown,
 449         .power_save             = NULL,
 450         .calibrate_decr         = generic_calibrate_decr,
 451 #ifdef CONFIG_KEXEC_CORE
 452         .kexec_cpu_down         = pnv_kexec_cpu_down,
 453 #endif
 454 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
 455         .memory_block_size      = pnv_memory_block_size,
 456 #endif
 457 };