4 * Copyright 2011 IBM Corp.
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.
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>
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>
32 #include <asm/machdep.h>
33 #include <asm/firmware.h>
37 #include <asm/kexec.h>
40 #include <asm/setup.h>
41 #include <asm/security_features.h>
46 static bool fw_feature_is(const char *state, const char *name,
47 struct device_node *fw_features)
49 struct device_node *np;
52 np = of_get_child_by_name(fw_features, name);
54 rc = of_property_read_bool(np, state);
61 static void init_fw_feat_flags(struct device_node *np)
63 if (fw_feature_is("enabled", "inst-spec-barrier-ori31,31,0", np))
64 security_ftr_set(SEC_FTR_SPEC_BAR_ORI31);
66 if (fw_feature_is("enabled", "fw-bcctrl-serialized", np))
67 security_ftr_set(SEC_FTR_BCCTRL_SERIALISED);
69 if (fw_feature_is("enabled", "inst-l1d-flush-ori30,30,0", np))
70 security_ftr_set(SEC_FTR_L1D_FLUSH_ORI30);
72 if (fw_feature_is("enabled", "inst-l1d-flush-trig2", np))
73 security_ftr_set(SEC_FTR_L1D_FLUSH_TRIG2);
75 if (fw_feature_is("enabled", "fw-l1d-thread-split", np))
76 security_ftr_set(SEC_FTR_L1D_THREAD_PRIV);
78 if (fw_feature_is("enabled", "fw-count-cache-disabled", np))
79 security_ftr_set(SEC_FTR_COUNT_CACHE_DISABLED);
81 if (fw_feature_is("enabled", "fw-count-cache-flush-bcctr2,0,0", np))
82 security_ftr_set(SEC_FTR_BCCTR_FLUSH_ASSIST);
84 if (fw_feature_is("enabled", "needs-count-cache-flush-on-context-switch", np))
85 security_ftr_set(SEC_FTR_FLUSH_COUNT_CACHE);
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.
91 if (fw_feature_is("disabled", "speculation-policy-favor-security", np))
92 security_ftr_clear(SEC_FTR_FAVOUR_SECURITY);
94 if (fw_feature_is("disabled", "needs-l1d-flush-msr-pr-0-to-1", np))
95 security_ftr_clear(SEC_FTR_L1D_FLUSH_PR);
97 if (fw_feature_is("disabled", "needs-l1d-flush-msr-hv-1-to-0", np))
98 security_ftr_clear(SEC_FTR_L1D_FLUSH_HV);
100 if (fw_feature_is("disabled", "needs-spec-barrier-for-bound-checks", np))
101 security_ftr_clear(SEC_FTR_BNDS_CHK_SPEC_BAR);
104 static void pnv_setup_rfi_flush(void)
106 struct device_node *np, *fw_features;
107 enum l1d_flush_type type;
110 /* Default to fallback in case fw-features are not available */
111 type = L1D_FLUSH_FALLBACK;
113 np = of_find_node_by_name(NULL, "ibm,opal");
114 fw_features = of_get_child_by_name(np, "fw-features");
118 init_fw_feat_flags(fw_features);
119 of_node_put(fw_features);
121 if (security_ftr_enabled(SEC_FTR_L1D_FLUSH_TRIG2))
122 type = L1D_FLUSH_MTTRIG;
124 if (security_ftr_enabled(SEC_FTR_L1D_FLUSH_ORI30))
125 type = L1D_FLUSH_ORI;
129 * If we are non-Power9 bare metal, we don't need to flush on kernel
130 * entry or after user access: they fix a P9 specific vulnerability.
132 if (!pvr_version_is(PVR_POWER9)) {
133 security_ftr_clear(SEC_FTR_L1D_FLUSH_ENTRY);
134 security_ftr_clear(SEC_FTR_L1D_FLUSH_UACCESS);
137 enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) && \
138 (security_ftr_enabled(SEC_FTR_L1D_FLUSH_PR) || \
139 security_ftr_enabled(SEC_FTR_L1D_FLUSH_HV));
141 setup_rfi_flush(type, enable);
142 setup_count_cache_flush();
144 enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) &&
145 security_ftr_enabled(SEC_FTR_L1D_FLUSH_ENTRY);
146 setup_entry_flush(enable);
148 enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) &&
149 security_ftr_enabled(SEC_FTR_L1D_FLUSH_UACCESS);
150 setup_uaccess_flush(enable);
153 static void __init pnv_setup_arch(void)
155 set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
157 pnv_setup_rfi_flush();
166 /* Setup RTC and NVRAM callbacks */
167 if (firmware_has_feature(FW_FEATURE_OPAL))
170 /* Enable NAP mode */
178 static void __init pnv_init(void)
181 * Initialize the LPC bus now so that legacy serial
182 * ports can be found on it
186 #ifdef CONFIG_HVC_OPAL
187 if (firmware_has_feature(FW_FEATURE_OPAL))
188 hvc_opal_init_early();
191 add_preferred_console("hvc", 0, NULL);
194 static void __init pnv_init_IRQ(void)
196 /* Try using a XIVE if available, otherwise use a XICS */
197 if (!xive_native_init())
200 WARN_ON(!ppc_md.get_irq);
203 static void pnv_show_cpuinfo(struct seq_file *m)
205 struct device_node *root;
206 const char *model = "";
208 root = of_find_node_by_path("/");
210 model = of_get_property(root, "model", NULL);
211 seq_printf(m, "machine\t\t: PowerNV %s\n", model);
212 if (firmware_has_feature(FW_FEATURE_OPAL))
213 seq_printf(m, "firmware\t: OPAL\n");
215 seq_printf(m, "firmware\t: BML\n");
218 seq_printf(m, "MMU\t\t: Radix\n");
220 seq_printf(m, "MMU\t\t: Hash\n");
223 static void pnv_prepare_going_down(void)
226 * Disable all notifiers from OPAL, we can't
227 * service interrupts anymore anyway
229 opal_event_shutdown();
231 /* Print flash update message if one is scheduled. */
232 opal_flash_update_print_message();
239 static void __noreturn pnv_restart(char *cmd)
243 pnv_prepare_going_down();
245 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
246 rc = opal_cec_reboot();
247 if (rc == OPAL_BUSY_EVENT)
248 opal_poll_events(NULL);
253 opal_poll_events(NULL);
256 static void __noreturn pnv_power_off(void)
260 pnv_prepare_going_down();
262 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
263 rc = opal_cec_power_down(0);
264 if (rc == OPAL_BUSY_EVENT)
265 opal_poll_events(NULL);
270 opal_poll_events(NULL);
273 static void __noreturn pnv_halt(void)
278 static void pnv_progress(char *s, unsigned short hex)
282 static void pnv_shutdown(void)
284 /* Let the PCI code clear up IODA tables */
288 * Stop OPAL activity: Unregister all OPAL interrupts so they
289 * don't fire up while we kexec and make sure all potentially
290 * DMA'ing ops are complete (such as dump retrieval).
295 #ifdef CONFIG_KEXEC_CORE
296 static void pnv_kexec_wait_secondaries_down(void)
298 int my_cpu, i, notified = -1;
302 for_each_online_cpu(i) {
304 int64_t rc, timeout = 1000;
310 rc = opal_query_cpu_status(get_hard_smp_processor_id(i),
312 if (rc != OPAL_SUCCESS || status != OPAL_THREAD_STARTED)
316 printk(KERN_INFO "kexec: waiting for cpu %d "
317 "(physical %d) to enter OPAL\n",
318 i, paca_ptrs[i]->hw_cpu_id);
323 * On crash secondaries might be unreachable or hung,
324 * so timeout if we've waited too long
327 if (timeout-- == 0) {
328 printk(KERN_ERR "kexec: timed out waiting for "
329 "cpu %d (physical %d) to enter OPAL\n",
330 i, paca_ptrs[i]->hw_cpu_id);
337 static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
344 xics_kexec_teardown_cpu(secondary);
346 /* On OPAL, we return all CPUs to firmware */
347 if (!firmware_has_feature(FW_FEATURE_OPAL))
351 /* Return secondary CPUs to firmware on OPAL v3 */
353 get_paca()->kexec_state = KEXEC_STATE_REAL_MODE;
356 /* Return the CPU to OPAL */
359 /* Primary waits for the secondaries to have reached OPAL */
360 pnv_kexec_wait_secondaries_down();
362 /* Switch XIVE back to emulation mode */
367 * We might be running as little-endian - now that interrupts
368 * are disabled, reset the HILE bit to big-endian so we don't
369 * take interrupts in the wrong endian later
371 * We reinit to enable both radix and hash on P9 to ensure
372 * the mode used by the next kernel is always supported.
374 reinit_flags = OPAL_REINIT_CPUS_HILE_BE;
375 if (cpu_has_feature(CPU_FTR_ARCH_300))
376 reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX |
377 OPAL_REINIT_CPUS_MMU_HASH;
378 opal_reinit_cpus(reinit_flags);
381 #endif /* CONFIG_KEXEC_CORE */
383 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
384 static unsigned long pnv_memory_block_size(void)
386 return 256UL * 1024 * 1024;
390 static void __init pnv_setup_machdep_opal(void)
392 ppc_md.get_boot_time = opal_get_boot_time;
393 ppc_md.restart = pnv_restart;
394 pm_power_off = pnv_power_off;
395 ppc_md.halt = pnv_halt;
396 /* ppc_md.system_reset_exception gets filled in by pnv_smp_init() */
397 ppc_md.machine_check_exception = opal_machine_check;
398 ppc_md.mce_check_early_recovery = opal_mce_check_early_recovery;
399 ppc_md.hmi_exception_early = opal_hmi_exception_early;
400 ppc_md.handle_hmi_exception = opal_handle_hmi_exception;
403 static int __init pnv_probe(void)
405 if (!of_machine_is_compatible("ibm,powernv"))
408 if (firmware_has_feature(FW_FEATURE_OPAL))
409 pnv_setup_machdep_opal();
411 pr_debug("PowerNV detected !\n");
418 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
419 void __init pnv_tm_init(void)
421 if (!firmware_has_feature(FW_FEATURE_OPAL) ||
422 !pvr_version_is(PVR_POWER9) ||
423 early_cpu_has_feature(CPU_FTR_TM))
426 if (opal_reinit_cpus(OPAL_REINIT_CPUS_TM_SUSPEND_DISABLED) != OPAL_SUCCESS)
429 pr_info("Enabling TM (Transactional Memory) with Suspend Disabled\n");
430 cur_cpu_spec->cpu_features |= CPU_FTR_TM;
431 /* Make sure "normal" HTM is off (it should be) */
432 cur_cpu_spec->cpu_user_features2 &= ~PPC_FEATURE2_HTM;
433 /* Turn on no suspend mode, and HTM no SC */
434 cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_HTM_NO_SUSPEND | \
435 PPC_FEATURE2_HTM_NOSC;
436 tm_suspend_disabled = true;
438 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
441 * Returns the cpu frequency for 'cpu' in Hz. This is used by
444 static unsigned long pnv_get_proc_freq(unsigned int cpu)
446 unsigned long ret_freq;
448 ret_freq = cpufreq_get(cpu) * 1000ul;
451 * If the backend cpufreq driver does not exist,
452 * then fallback to old way of reporting the clockrate.
455 ret_freq = ppc_proc_freq;
459 define_machine(powernv) {
462 .setup_arch = pnv_setup_arch,
463 .init_IRQ = pnv_init_IRQ,
464 .show_cpuinfo = pnv_show_cpuinfo,
465 .get_proc_freq = pnv_get_proc_freq,
466 .progress = pnv_progress,
467 .machine_shutdown = pnv_shutdown,
469 .calibrate_decr = generic_calibrate_decr,
470 #ifdef CONFIG_KEXEC_CORE
471 .kexec_cpu_down = pnv_kexec_cpu_down,
473 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
474 .memory_block_size = pnv_memory_block_size,