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
  41 #include "powernv.h"
  42
  43 static void __init pnv_setup_arch(void)
  44 {
  45         set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
  46
  47         /* Initialize SMP */
  48         pnv_smp_init();
  49
  50         /* Setup PCI */
  51         pnv_pci_init();
  52
  53         /* Setup RTC and NVRAM callbacks */
  54         if (firmware_has_feature(FW_FEATURE_OPAL))
  55                 opal_nvram_init();
  56
  57         /* Enable NAP mode */
  58         powersave_nap = 1;
  59
  60         /* XXX PMCS */
  61 }
  62
  63 static void __init pnv_init(void)
  64 {
  65         /*
  66          * Initialize the LPC bus now so that legacy serial
  67          * ports can be found on it
  68          */
  69         opal_lpc_init();
  70
  71 #ifdef CONFIG_HVC_OPAL
  72         if (firmware_has_feature(FW_FEATURE_OPAL))
  73                 hvc_opal_init_early();
  74         else
  75 #endif
  76                 add_preferred_console("hvc", 0, NULL);
  77 }
  78
  79 static void __init pnv_init_IRQ(void)
  80 {
  81         /* Try using a XIVE if available, otherwise use a XICS */
  82         if (!xive_native_init())
  83                 xics_init();
  84
  85         WARN_ON(!ppc_md.get_irq);
  86 }
  87
  88 static void pnv_show_cpuinfo(struct seq_file *m)
  89 {
  90         struct device_node *root;
  91         const char *model = "";
  92
  93         root = of_find_node_by_path("/");
  94         if (root)
  95                 model = of_get_property(root, "model", NULL);
  96         seq_printf(m, "machine\t\t: PowerNV %s\n", model);
  97         if (firmware_has_feature(FW_FEATURE_OPAL))
  98                 seq_printf(m, "firmware\t: OPAL\n");
  99         else
 100                 seq_printf(m, "firmware\t: BML\n");
 101         of_node_put(root);
 102         if (radix_enabled())
 103                 seq_printf(m, "MMU\t\t: Radix\n");
 104         else
 105                 seq_printf(m, "MMU\t\t: Hash\n");
 106 }
 107
 108 static void pnv_prepare_going_down(void)
 109 {
 110         /*
 111          * Disable all notifiers from OPAL, we can't
 112          * service interrupts anymore anyway
 113          */
 114         opal_event_shutdown();
 115
 116         /* Soft disable interrupts */
 117         local_irq_disable();
 118
 119         /*
 120          * Return secondary CPUs to firwmare if a flash update
 121          * is pending otherwise we will get all sort of error
 122          * messages about CPU being stuck etc.. This will also
 123          * have the side effect of hard disabling interrupts so
 124          * past this point, the kernel is effectively dead.
 125          */
 126         opal_flash_term_callback();
 127 }
 128
 129 static void  __noreturn pnv_restart(char *cmd)
 130 {
 131         long rc = OPAL_BUSY;
 132
 133         pnv_prepare_going_down();
 134
 135         while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
 136                 rc = opal_cec_reboot();
 137                 if (rc == OPAL_BUSY_EVENT)
 138                         opal_poll_events(NULL);
 139                 else
 140                         mdelay(10);
 141         }
 142         for (;;)
 143                 opal_poll_events(NULL);
 144 }
 145
 146 static void __noreturn pnv_power_off(void)
 147 {
 148         long rc = OPAL_BUSY;
 149
 150         pnv_prepare_going_down();
 151
 152         while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
 153                 rc = opal_cec_power_down(0);
 154                 if (rc == OPAL_BUSY_EVENT)
 155                         opal_poll_events(NULL);
 156                 else
 157                         mdelay(10);
 158         }
 159         for (;;)
 160                 opal_poll_events(NULL);
 161 }
 162
 163 static void __noreturn pnv_halt(void)
 164 {
 165         pnv_power_off();
 166 }
 167
 168 static void pnv_progress(char *s, unsigned short hex)
 169 {
 170 }
 171
 172 static void pnv_shutdown(void)
 173 {
 174         /* Let the PCI code clear up IODA tables */
 175         pnv_pci_shutdown();
 176
 177         /*
 178          * Stop OPAL activity: Unregister all OPAL interrupts so they
 179          * don't fire up while we kexec and make sure all potentially
 180          * DMA'ing ops are complete (such as dump retrieval).
 181          */
 182         opal_shutdown();
 183 }
 184
 185 #ifdef CONFIG_KEXEC_CORE
 186 static void pnv_kexec_wait_secondaries_down(void)
 187 {
 188         int my_cpu, i, notified = -1;
 189
 190         my_cpu = get_cpu();
 191
 192         for_each_online_cpu(i) {
 193                 uint8_t status;
 194                 int64_t rc, timeout = 1000;
 195
 196                 if (i == my_cpu)
 197                         continue;
 198
 199                 for (;;) {
 200                         rc = opal_query_cpu_status(get_hard_smp_processor_id(i),
 201                                                    &status);
 202                         if (rc != OPAL_SUCCESS || status != OPAL_THREAD_STARTED)
 203                                 break;
 204                         barrier();
 205                         if (i != notified) {
 206                                 printk(KERN_INFO "kexec: waiting for cpu %d "
 207                                        "(physical %d) to enter OPAL\n",
 208                                        i, paca[i].hw_cpu_id);
 209                                 notified = i;
 210                         }
 211
 212                         /*
 213                          * On crash secondaries might be unreachable or hung,
 214                          * so timeout if we've waited too long
 215                          * */
 216                         mdelay(1);
 217                         if (timeout-- == 0) {
 218                                 printk(KERN_ERR "kexec: timed out waiting for "
 219                                        "cpu %d (physical %d) to enter OPAL\n",
 220                                        i, paca[i].hw_cpu_id);
 221                                 break;
 222                         }
 223                 }
 224         }
 225 }
 226
 227 static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
 228 {
 229         u64 reinit_flags;
 230
 231         if (xive_enabled())
 232                 xive_kexec_teardown_cpu(secondary);
 233         else
 234                 xics_kexec_teardown_cpu(secondary);
 235
 236         /* On OPAL, we return all CPUs to firmware */
 237         if (!firmware_has_feature(FW_FEATURE_OPAL))
 238                 return;
 239
 240         if (secondary) {
 241                 /* Return secondary CPUs to firmware on OPAL v3 */
 242                 mb();
 243                 get_paca()->kexec_state = KEXEC_STATE_REAL_MODE;
 244                 mb();
 245
 246                 /* Return the CPU to OPAL */
 247                 opal_return_cpu();
 248         } else {
 249                 /* Primary waits for the secondaries to have reached OPAL */
 250                 pnv_kexec_wait_secondaries_down();
 251
 252                 /* Switch XIVE back to emulation mode */
 253                 if (xive_enabled())
 254                         xive_shutdown();
 255
 256                 /*
 257                  * We might be running as little-endian - now that interrupts
 258                  * are disabled, reset the HILE bit to big-endian so we don't
 259                  * take interrupts in the wrong endian later
 260                  *
 261                  * We reinit to enable both radix and hash on P9 to ensure
 262                  * the mode used by the next kernel is always supported.
 263                  */
 264                 reinit_flags = OPAL_REINIT_CPUS_HILE_BE;
 265                 if (cpu_has_feature(CPU_FTR_ARCH_300))
 266                         reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX |
 267                                 OPAL_REINIT_CPUS_MMU_HASH;
 268                 opal_reinit_cpus(reinit_flags);
 269         }
 270 }
 271 #endif /* CONFIG_KEXEC_CORE */
 272
 273 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
 274 static unsigned long pnv_memory_block_size(void)
 275 {
 276         /*
 277          * We map the kernel linear region with 1GB large pages on radix. For
 278          * memory hot unplug to work our memory block size must be at least
 279          * this size.
 280          */
 281         if (radix_enabled())
 282                 return 1UL * 1024 * 1024 * 1024;
 283         else
 284                 return 256UL * 1024 * 1024;
 285 }
 286 #endif
 287
 288 static void __init pnv_setup_machdep_opal(void)
 289 {
 290         ppc_md.get_boot_time = opal_get_boot_time;
 291         ppc_md.restart = pnv_restart;
 292         pm_power_off = pnv_power_off;
 293         ppc_md.halt = pnv_halt;
 294         /* ppc_md.system_reset_exception gets filled in by pnv_smp_init() */
 295         ppc_md.machine_check_exception = opal_machine_check;
 296         ppc_md.mce_check_early_recovery = opal_mce_check_early_recovery;
 297         ppc_md.hmi_exception_early = opal_hmi_exception_early;
 298         ppc_md.handle_hmi_exception = opal_handle_hmi_exception;
 299 }
 300
 301 static int __init pnv_probe(void)
 302 {
 303         if (!of_machine_is_compatible("ibm,powernv"))
 304                 return 0;
 305
 306         if (firmware_has_feature(FW_FEATURE_OPAL))
 307                 pnv_setup_machdep_opal();
 308
 309         pr_debug("PowerNV detected !\n");
 310
 311         pnv_init();
 312
 313         return 1;
 314 }
 315
 316 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
 317 void __init pnv_tm_init(void)
 318 {
 319         if (!firmware_has_feature(FW_FEATURE_OPAL) ||
 320             !pvr_version_is(PVR_POWER9) ||
 321             early_cpu_has_feature(CPU_FTR_TM))
 322                 return;
 323
 324         if (opal_reinit_cpus(OPAL_REINIT_CPUS_TM_SUSPEND_DISABLED) != OPAL_SUCCESS)
 325                 return;
 326
 327         pr_info("Enabling TM (Transactional Memory) with Suspend Disabled\n");
 328         cur_cpu_spec->cpu_features |= CPU_FTR_TM;
 329         /* Make sure "normal" HTM is off (it should be) */
 330         cur_cpu_spec->cpu_user_features2 &= ~PPC_FEATURE2_HTM;
 331         /* Turn on no suspend mode, and HTM no SC */
 332         cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_HTM_NO_SUSPEND | \
 333                                             PPC_FEATURE2_HTM_NOSC;
 334         tm_suspend_disabled = true;
 335 }
 336 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
 337
 338 /*
 339  * Returns the cpu frequency for 'cpu' in Hz. This is used by
 340  * /proc/cpuinfo
 341  */
 342 static unsigned long pnv_get_proc_freq(unsigned int cpu)
 343 {
 344         unsigned long ret_freq;
 345
 346         ret_freq = cpufreq_get(cpu) * 1000ul;
 347
 348         /*
 349          * If the backend cpufreq driver does not exist,
 350          * then fallback to old way of reporting the clockrate.
 351          */
 352         if (!ret_freq)
 353                 ret_freq = ppc_proc_freq;
 354         return ret_freq;
 355 }
 356
 357 define_machine(powernv) {
 358         .name                   = "PowerNV",
 359         .probe                  = pnv_probe,
 360         .setup_arch             = pnv_setup_arch,
 361         .init_IRQ               = pnv_init_IRQ,
 362         .show_cpuinfo           = pnv_show_cpuinfo,
 363         .get_proc_freq          = pnv_get_proc_freq,
 364         .progress               = pnv_progress,
 365         .machine_shutdown       = pnv_shutdown,
 366         .power_save             = NULL,
 367         .calibrate_decr         = generic_calibrate_decr,
 368 #ifdef CONFIG_KEXEC_CORE
 369         .kexec_cpu_down         = pnv_kexec_cpu_down,
 370 #endif
 371 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
 372         .memory_block_size      = pnv_memory_block_size,
 373 #endif
 374 };