1 // SPDX-License-Identifier: GPL-2.0-or-later
5 * Copyright 2011 IBM Corp.
10 #include <linux/cpu.h>
11 #include <linux/errno.h>
12 #include <linux/sched.h>
13 #include <linux/kernel.h>
14 #include <linux/tty.h>
15 #include <linux/reboot.h>
16 #include <linux/init.h>
17 #include <linux/console.h>
18 #include <linux/delay.h>
19 #include <linux/irq.h>
20 #include <linux/seq_file.h>
22 #include <linux/of_fdt.h>
23 #include <linux/interrupt.h>
24 #include <linux/bug.h>
25 #include <linux/pci.h>
26 #include <linux/cpufreq.h>
28 #include <asm/machdep.h>
29 #include <asm/firmware.h>
33 #include <asm/kexec.h>
36 #include <asm/setup.h>
37 #include <asm/security_features.h>
42 static bool fw_feature_is(const char *state, const char *name,
43 struct device_node *fw_features)
45 struct device_node *np;
48 np = of_get_child_by_name(fw_features, name);
50 rc = of_property_read_bool(np, state);
57 static void init_fw_feat_flags(struct device_node *np)
59 if (fw_feature_is("enabled", "inst-spec-barrier-ori31,31,0", np))
60 security_ftr_set(SEC_FTR_SPEC_BAR_ORI31);
62 if (fw_feature_is("enabled", "fw-bcctrl-serialized", np))
63 security_ftr_set(SEC_FTR_BCCTRL_SERIALISED);
65 if (fw_feature_is("enabled", "inst-l1d-flush-ori30,30,0", np))
66 security_ftr_set(SEC_FTR_L1D_FLUSH_ORI30);
68 if (fw_feature_is("enabled", "inst-l1d-flush-trig2", np))
69 security_ftr_set(SEC_FTR_L1D_FLUSH_TRIG2);
71 if (fw_feature_is("enabled", "fw-l1d-thread-split", np))
72 security_ftr_set(SEC_FTR_L1D_THREAD_PRIV);
74 if (fw_feature_is("enabled", "fw-count-cache-disabled", np))
75 security_ftr_set(SEC_FTR_COUNT_CACHE_DISABLED);
77 if (fw_feature_is("enabled", "fw-count-cache-flush-bcctr2,0,0", np))
78 security_ftr_set(SEC_FTR_BCCTR_FLUSH_ASSIST);
80 if (fw_feature_is("enabled", "needs-count-cache-flush-on-context-switch", np))
81 security_ftr_set(SEC_FTR_FLUSH_COUNT_CACHE);
84 * The features below are enabled by default, so we instead look to see
85 * if firmware has *disabled* them, and clear them if so.
87 if (fw_feature_is("disabled", "speculation-policy-favor-security", np))
88 security_ftr_clear(SEC_FTR_FAVOUR_SECURITY);
90 if (fw_feature_is("disabled", "needs-l1d-flush-msr-pr-0-to-1", np))
91 security_ftr_clear(SEC_FTR_L1D_FLUSH_PR);
93 if (fw_feature_is("disabled", "needs-l1d-flush-msr-hv-1-to-0", np))
94 security_ftr_clear(SEC_FTR_L1D_FLUSH_HV);
96 if (fw_feature_is("disabled", "needs-spec-barrier-for-bound-checks", np))
97 security_ftr_clear(SEC_FTR_BNDS_CHK_SPEC_BAR);
100 static void pnv_setup_rfi_flush(void)
102 struct device_node *np, *fw_features;
103 enum l1d_flush_type type;
106 /* Default to fallback in case fw-features are not available */
107 type = L1D_FLUSH_FALLBACK;
109 np = of_find_node_by_name(NULL, "ibm,opal");
110 fw_features = of_get_child_by_name(np, "fw-features");
114 init_fw_feat_flags(fw_features);
115 of_node_put(fw_features);
117 if (security_ftr_enabled(SEC_FTR_L1D_FLUSH_TRIG2))
118 type = L1D_FLUSH_MTTRIG;
120 if (security_ftr_enabled(SEC_FTR_L1D_FLUSH_ORI30))
121 type = L1D_FLUSH_ORI;
124 enable = security_ftr_enabled(SEC_FTR_FAVOUR_SECURITY) && \
125 (security_ftr_enabled(SEC_FTR_L1D_FLUSH_PR) || \
126 security_ftr_enabled(SEC_FTR_L1D_FLUSH_HV));
128 setup_rfi_flush(type, enable);
129 setup_count_cache_flush();
132 static void __init pnv_setup_arch(void)
134 set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
136 pnv_setup_rfi_flush();
145 /* Setup RTC and NVRAM callbacks */
146 if (firmware_has_feature(FW_FEATURE_OPAL))
149 /* Enable NAP mode */
155 static void __init pnv_init(void)
158 * Initialize the LPC bus now so that legacy serial
159 * ports can be found on it
163 #ifdef CONFIG_HVC_OPAL
164 if (firmware_has_feature(FW_FEATURE_OPAL))
165 hvc_opal_init_early();
168 add_preferred_console("hvc", 0, NULL);
171 static void __init pnv_init_IRQ(void)
173 /* Try using a XIVE if available, otherwise use a XICS */
174 if (!xive_native_init())
177 WARN_ON(!ppc_md.get_irq);
180 static void pnv_show_cpuinfo(struct seq_file *m)
182 struct device_node *root;
183 const char *model = "";
185 root = of_find_node_by_path("/");
187 model = of_get_property(root, "model", NULL);
188 seq_printf(m, "machine\t\t: PowerNV %s\n", model);
189 if (firmware_has_feature(FW_FEATURE_OPAL))
190 seq_printf(m, "firmware\t: OPAL\n");
192 seq_printf(m, "firmware\t: BML\n");
195 seq_printf(m, "MMU\t\t: Radix\n");
197 seq_printf(m, "MMU\t\t: Hash\n");
200 static void pnv_prepare_going_down(void)
203 * Disable all notifiers from OPAL, we can't
204 * service interrupts anymore anyway
206 opal_event_shutdown();
208 /* Print flash update message if one is scheduled. */
209 opal_flash_update_print_message();
216 static void __noreturn pnv_restart(char *cmd)
220 pnv_prepare_going_down();
224 rc = opal_cec_reboot();
225 else if (strcmp(cmd, "full") == 0)
226 rc = opal_cec_reboot2(OPAL_REBOOT_FULL_IPL, NULL);
228 rc = OPAL_UNSUPPORTED;
230 if (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
231 /* Opal is busy wait for some time and retry */
232 opal_poll_events(NULL);
235 } else if (cmd && rc) {
236 /* Unknown error while issuing reboot */
237 if (rc == OPAL_UNSUPPORTED)
238 pr_err("Unsupported '%s' reboot.\n", cmd);
240 pr_err("Unable to issue '%s' reboot. Err=%ld\n",
242 pr_info("Forcing a cec-reboot\n");
246 } else if (rc != OPAL_SUCCESS) {
247 /* Unknown error while issuing cec-reboot */
248 pr_err("Unable to reboot. Err=%ld\n", rc);
251 } while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT);
254 opal_poll_events(NULL);
257 static void __noreturn pnv_power_off(void)
261 pnv_prepare_going_down();
263 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
264 rc = opal_cec_power_down(0);
265 if (rc == OPAL_BUSY_EVENT)
266 opal_poll_events(NULL);
271 opal_poll_events(NULL);
274 static void __noreturn pnv_halt(void)
279 static void pnv_progress(char *s, unsigned short hex)
283 static void pnv_shutdown(void)
285 /* Let the PCI code clear up IODA tables */
289 * Stop OPAL activity: Unregister all OPAL interrupts so they
290 * don't fire up while we kexec and make sure all potentially
291 * DMA'ing ops are complete (such as dump retrieval).
296 #ifdef CONFIG_KEXEC_CORE
297 static void pnv_kexec_wait_secondaries_down(void)
299 int my_cpu, i, notified = -1;
303 for_each_online_cpu(i) {
305 int64_t rc, timeout = 1000;
311 rc = opal_query_cpu_status(get_hard_smp_processor_id(i),
313 if (rc != OPAL_SUCCESS || status != OPAL_THREAD_STARTED)
317 printk(KERN_INFO "kexec: waiting for cpu %d "
318 "(physical %d) to enter OPAL\n",
319 i, paca_ptrs[i]->hw_cpu_id);
324 * On crash secondaries might be unreachable or hung,
325 * so timeout if we've waited too long
328 if (timeout-- == 0) {
329 printk(KERN_ERR "kexec: timed out waiting for "
330 "cpu %d (physical %d) to enter OPAL\n",
331 i, paca_ptrs[i]->hw_cpu_id);
338 static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
345 xics_kexec_teardown_cpu(secondary);
347 /* On OPAL, we return all CPUs to firmware */
348 if (!firmware_has_feature(FW_FEATURE_OPAL))
352 /* Return secondary CPUs to firmware on OPAL v3 */
354 get_paca()->kexec_state = KEXEC_STATE_REAL_MODE;
357 /* Return the CPU to OPAL */
360 /* Primary waits for the secondaries to have reached OPAL */
361 pnv_kexec_wait_secondaries_down();
363 /* Switch XIVE back to emulation mode */
368 * We might be running as little-endian - now that interrupts
369 * are disabled, reset the HILE bit to big-endian so we don't
370 * take interrupts in the wrong endian later
372 * We reinit to enable both radix and hash on P9 to ensure
373 * the mode used by the next kernel is always supported.
375 reinit_flags = OPAL_REINIT_CPUS_HILE_BE;
376 if (cpu_has_feature(CPU_FTR_ARCH_300))
377 reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX |
378 OPAL_REINIT_CPUS_MMU_HASH;
379 opal_reinit_cpus(reinit_flags);
382 #endif /* CONFIG_KEXEC_CORE */
384 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
385 static unsigned long pnv_memory_block_size(void)
387 return 256UL * 1024 * 1024;
391 static void __init pnv_setup_machdep_opal(void)
393 ppc_md.get_boot_time = opal_get_boot_time;
394 ppc_md.restart = pnv_restart;
395 pm_power_off = pnv_power_off;
396 ppc_md.halt = pnv_halt;
397 /* ppc_md.system_reset_exception gets filled in by pnv_smp_init() */
398 ppc_md.machine_check_exception = opal_machine_check;
399 ppc_md.mce_check_early_recovery = opal_mce_check_early_recovery;
400 if (opal_check_token(OPAL_HANDLE_HMI2))
401 ppc_md.hmi_exception_early = opal_hmi_exception_early2;
403 ppc_md.hmi_exception_early = opal_hmi_exception_early;
404 ppc_md.handle_hmi_exception = opal_handle_hmi_exception;
407 static int __init pnv_probe(void)
409 if (!of_machine_is_compatible("ibm,powernv"))
412 if (firmware_has_feature(FW_FEATURE_OPAL))
413 pnv_setup_machdep_opal();
415 pr_debug("PowerNV detected !\n");
422 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
423 void __init pnv_tm_init(void)
425 if (!firmware_has_feature(FW_FEATURE_OPAL) ||
426 !pvr_version_is(PVR_POWER9) ||
427 early_cpu_has_feature(CPU_FTR_TM))
430 if (opal_reinit_cpus(OPAL_REINIT_CPUS_TM_SUSPEND_DISABLED) != OPAL_SUCCESS)
433 pr_info("Enabling TM (Transactional Memory) with Suspend Disabled\n");
434 cur_cpu_spec->cpu_features |= CPU_FTR_TM;
435 /* Make sure "normal" HTM is off (it should be) */
436 cur_cpu_spec->cpu_user_features2 &= ~PPC_FEATURE2_HTM;
437 /* Turn on no suspend mode, and HTM no SC */
438 cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_HTM_NO_SUSPEND | \
439 PPC_FEATURE2_HTM_NOSC;
440 tm_suspend_disabled = true;
442 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
445 * Returns the cpu frequency for 'cpu' in Hz. This is used by
448 static unsigned long pnv_get_proc_freq(unsigned int cpu)
450 unsigned long ret_freq;
452 ret_freq = cpufreq_get(cpu) * 1000ul;
455 * If the backend cpufreq driver does not exist,
456 * then fallback to old way of reporting the clockrate.
459 ret_freq = ppc_proc_freq;
463 static long pnv_machine_check_early(struct pt_regs *regs)
467 if (cur_cpu_spec && cur_cpu_spec->machine_check_early)
468 handled = cur_cpu_spec->machine_check_early(regs);
473 define_machine(powernv) {
476 .setup_arch = pnv_setup_arch,
477 .init_IRQ = pnv_init_IRQ,
478 .show_cpuinfo = pnv_show_cpuinfo,
479 .get_proc_freq = pnv_get_proc_freq,
480 .progress = pnv_progress,
481 .machine_shutdown = pnv_shutdown,
483 .calibrate_decr = generic_calibrate_decr,
484 .machine_check_early = pnv_machine_check_early,
485 #ifdef CONFIG_KEXEC_CORE
486 .kexec_cpu_down = pnv_kexec_cpu_down,
488 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
489 .memory_block_size = pnv_memory_block_size,