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>
44 static void pnv_setup_rfi_flush(void)
46 struct device_node *np, *fw_features;
47 enum l1d_flush_type type;
50 /* Default to fallback in case fw-features are not available */
51 type = L1D_FLUSH_FALLBACK;
54 np = of_find_node_by_name(NULL, "ibm,opal");
55 fw_features = of_get_child_by_name(np, "fw-features");
59 np = of_get_child_by_name(fw_features, "inst-l1d-flush-trig2");
60 if (np && of_property_read_bool(np, "enabled"))
61 type = L1D_FLUSH_MTTRIG;
65 np = of_get_child_by_name(fw_features, "inst-l1d-flush-ori30,30,0");
66 if (np && of_property_read_bool(np, "enabled"))
71 /* Enable unless firmware says NOT to */
73 np = of_get_child_by_name(fw_features, "needs-l1d-flush-msr-hv-1-to-0");
74 if (np && of_property_read_bool(np, "disabled"))
79 np = of_get_child_by_name(fw_features, "needs-l1d-flush-msr-pr-0-to-1");
80 if (np && of_property_read_bool(np, "disabled"))
84 of_node_put(fw_features);
87 setup_rfi_flush(type, enable > 0);
90 static void __init pnv_setup_arch(void)
92 set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
94 pnv_setup_rfi_flush();
102 /* Setup RTC and NVRAM callbacks */
103 if (firmware_has_feature(FW_FEATURE_OPAL))
106 /* Enable NAP mode */
112 static void __init pnv_init(void)
115 * Initialize the LPC bus now so that legacy serial
116 * ports can be found on it
120 #ifdef CONFIG_HVC_OPAL
121 if (firmware_has_feature(FW_FEATURE_OPAL))
122 hvc_opal_init_early();
125 add_preferred_console("hvc", 0, NULL);
128 static void __init pnv_init_IRQ(void)
130 /* Try using a XIVE if available, otherwise use a XICS */
131 if (!xive_native_init())
134 WARN_ON(!ppc_md.get_irq);
137 static void pnv_show_cpuinfo(struct seq_file *m)
139 struct device_node *root;
140 const char *model = "";
142 root = of_find_node_by_path("/");
144 model = of_get_property(root, "model", NULL);
145 seq_printf(m, "machine\t\t: PowerNV %s\n", model);
146 if (firmware_has_feature(FW_FEATURE_OPAL))
147 seq_printf(m, "firmware\t: OPAL\n");
149 seq_printf(m, "firmware\t: BML\n");
152 seq_printf(m, "MMU\t\t: Radix\n");
154 seq_printf(m, "MMU\t\t: Hash\n");
157 static void pnv_prepare_going_down(void)
160 * Disable all notifiers from OPAL, we can't
161 * service interrupts anymore anyway
163 opal_event_shutdown();
165 /* Soft disable interrupts */
169 * Return secondary CPUs to firwmare if a flash update
170 * is pending otherwise we will get all sort of error
171 * messages about CPU being stuck etc.. This will also
172 * have the side effect of hard disabling interrupts so
173 * past this point, the kernel is effectively dead.
175 opal_flash_term_callback();
178 static void __noreturn pnv_restart(char *cmd)
182 pnv_prepare_going_down();
184 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
185 rc = opal_cec_reboot();
186 if (rc == OPAL_BUSY_EVENT)
187 opal_poll_events(NULL);
192 opal_poll_events(NULL);
195 static void __noreturn pnv_power_off(void)
199 pnv_prepare_going_down();
201 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
202 rc = opal_cec_power_down(0);
203 if (rc == OPAL_BUSY_EVENT)
204 opal_poll_events(NULL);
209 opal_poll_events(NULL);
212 static void __noreturn pnv_halt(void)
217 static void pnv_progress(char *s, unsigned short hex)
221 static void pnv_shutdown(void)
223 /* Let the PCI code clear up IODA tables */
227 * Stop OPAL activity: Unregister all OPAL interrupts so they
228 * don't fire up while we kexec and make sure all potentially
229 * DMA'ing ops are complete (such as dump retrieval).
234 #ifdef CONFIG_KEXEC_CORE
235 static void pnv_kexec_wait_secondaries_down(void)
237 int my_cpu, i, notified = -1;
241 for_each_online_cpu(i) {
243 int64_t rc, timeout = 1000;
249 rc = opal_query_cpu_status(get_hard_smp_processor_id(i),
251 if (rc != OPAL_SUCCESS || status != OPAL_THREAD_STARTED)
255 printk(KERN_INFO "kexec: waiting for cpu %d "
256 "(physical %d) to enter OPAL\n",
257 i, paca[i].hw_cpu_id);
262 * On crash secondaries might be unreachable or hung,
263 * so timeout if we've waited too long
266 if (timeout-- == 0) {
267 printk(KERN_ERR "kexec: timed out waiting for "
268 "cpu %d (physical %d) to enter OPAL\n",
269 i, paca[i].hw_cpu_id);
276 static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
281 xive_kexec_teardown_cpu(secondary);
283 xics_kexec_teardown_cpu(secondary);
285 /* On OPAL, we return all CPUs to firmware */
286 if (!firmware_has_feature(FW_FEATURE_OPAL))
290 /* Return secondary CPUs to firmware on OPAL v3 */
292 get_paca()->kexec_state = KEXEC_STATE_REAL_MODE;
295 /* Return the CPU to OPAL */
298 /* Primary waits for the secondaries to have reached OPAL */
299 pnv_kexec_wait_secondaries_down();
301 /* Switch XIVE back to emulation mode */
306 * We might be running as little-endian - now that interrupts
307 * are disabled, reset the HILE bit to big-endian so we don't
308 * take interrupts in the wrong endian later
310 * We reinit to enable both radix and hash on P9 to ensure
311 * the mode used by the next kernel is always supported.
313 reinit_flags = OPAL_REINIT_CPUS_HILE_BE;
314 if (cpu_has_feature(CPU_FTR_ARCH_300))
315 reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX |
316 OPAL_REINIT_CPUS_MMU_HASH;
317 opal_reinit_cpus(reinit_flags);
320 #endif /* CONFIG_KEXEC_CORE */
322 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
323 static unsigned long pnv_memory_block_size(void)
326 * We map the kernel linear region with 1GB large pages on radix. For
327 * memory hot unplug to work our memory block size must be at least
331 return 1UL * 1024 * 1024 * 1024;
333 return 256UL * 1024 * 1024;
337 static void __init pnv_setup_machdep_opal(void)
339 ppc_md.get_boot_time = opal_get_boot_time;
340 ppc_md.restart = pnv_restart;
341 pm_power_off = pnv_power_off;
342 ppc_md.halt = pnv_halt;
343 /* ppc_md.system_reset_exception gets filled in by pnv_smp_init() */
344 ppc_md.machine_check_exception = opal_machine_check;
345 ppc_md.mce_check_early_recovery = opal_mce_check_early_recovery;
346 ppc_md.hmi_exception_early = opal_hmi_exception_early;
347 ppc_md.handle_hmi_exception = opal_handle_hmi_exception;
350 static int __init pnv_probe(void)
352 if (!of_machine_is_compatible("ibm,powernv"))
355 if (firmware_has_feature(FW_FEATURE_OPAL))
356 pnv_setup_machdep_opal();
358 pr_debug("PowerNV detected !\n");
365 #ifdef CONFIG_PPC_TRANSACTIONAL_MEM
366 void __init pnv_tm_init(void)
368 if (!firmware_has_feature(FW_FEATURE_OPAL) ||
369 !pvr_version_is(PVR_POWER9) ||
370 early_cpu_has_feature(CPU_FTR_TM))
373 if (opal_reinit_cpus(OPAL_REINIT_CPUS_TM_SUSPEND_DISABLED) != OPAL_SUCCESS)
376 pr_info("Enabling TM (Transactional Memory) with Suspend Disabled\n");
377 cur_cpu_spec->cpu_features |= CPU_FTR_TM;
378 /* Make sure "normal" HTM is off (it should be) */
379 cur_cpu_spec->cpu_user_features2 &= ~PPC_FEATURE2_HTM;
380 /* Turn on no suspend mode, and HTM no SC */
381 cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_HTM_NO_SUSPEND | \
382 PPC_FEATURE2_HTM_NOSC;
383 tm_suspend_disabled = true;
385 #endif /* CONFIG_PPC_TRANSACTIONAL_MEM */
388 * Returns the cpu frequency for 'cpu' in Hz. This is used by
391 static unsigned long pnv_get_proc_freq(unsigned int cpu)
393 unsigned long ret_freq;
395 ret_freq = cpufreq_get(cpu) * 1000ul;
398 * If the backend cpufreq driver does not exist,
399 * then fallback to old way of reporting the clockrate.
402 ret_freq = ppc_proc_freq;
406 define_machine(powernv) {
409 .setup_arch = pnv_setup_arch,
410 .init_IRQ = pnv_init_IRQ,
411 .show_cpuinfo = pnv_show_cpuinfo,
412 .get_proc_freq = pnv_get_proc_freq,
413 .progress = pnv_progress,
414 .machine_shutdown = pnv_shutdown,
416 .calibrate_decr = generic_calibrate_decr,
417 #ifdef CONFIG_KEXEC_CORE
418 .kexec_cpu_down = pnv_kexec_cpu_down,
420 #ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
421 .memory_block_size = pnv_memory_block_size,