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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
42#include "powernv.h"
43
44static void pnv_setup_rfi_flush(void)
45{
46 struct device_node *np, *fw_features;
47 enum l1d_flush_type type;
48 int enable;
49
50
51 type = L1D_FLUSH_FALLBACK;
52 enable = 1;
53
54 np = of_find_node_by_name(NULL, "ibm,opal");
55 fw_features = of_get_child_by_name(np, "fw-features");
56 of_node_put(np);
57
58 if (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;
62
63 of_node_put(np);
64
65 np = of_get_child_by_name(fw_features, "inst-l1d-flush-ori30,30,0");
66 if (np && of_property_read_bool(np, "enabled"))
67 type = L1D_FLUSH_ORI;
68
69 of_node_put(np);
70
71
72 enable = 2;
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"))
75 enable--;
76
77 of_node_put(np);
78
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"))
81 enable--;
82
83 np = of_get_child_by_name(fw_features, "speculation-policy-favor-security");
84 if (np && of_property_read_bool(np, "disabled"))
85 enable = 0;
86
87 of_node_put(np);
88 of_node_put(fw_features);
89 }
90
91 setup_rfi_flush(type, enable > 0);
92}
93
94static void __init pnv_setup_arch(void)
95{
96 set_arch_panic_timeout(10, ARCH_PANIC_TIMEOUT);
97
98 pnv_setup_rfi_flush();
99
100
101 pnv_smp_init();
102
103
104 pnv_pci_init();
105
106
107 if (firmware_has_feature(FW_FEATURE_OPAL))
108 opal_nvram_init();
109
110
111 powersave_nap = 1;
112
113
114}
115
116static void __init pnv_init(void)
117{
118
119
120
121
122 opal_lpc_init();
123
124#ifdef CONFIG_HVC_OPAL
125 if (firmware_has_feature(FW_FEATURE_OPAL))
126 hvc_opal_init_early();
127 else
128#endif
129 add_preferred_console("hvc", 0, NULL);
130}
131
132static void __init pnv_init_IRQ(void)
133{
134
135 if (!xive_native_init())
136 xics_init();
137
138 WARN_ON(!ppc_md.get_irq);
139}
140
141static void pnv_show_cpuinfo(struct seq_file *m)
142{
143 struct device_node *root;
144 const char *model = "";
145
146 root = of_find_node_by_path("/");
147 if (root)
148 model = of_get_property(root, "model", NULL);
149 seq_printf(m, "machine\t\t: PowerNV %s\n", model);
150 if (firmware_has_feature(FW_FEATURE_OPAL))
151 seq_printf(m, "firmware\t: OPAL\n");
152 else
153 seq_printf(m, "firmware\t: BML\n");
154 of_node_put(root);
155 if (radix_enabled())
156 seq_printf(m, "MMU\t\t: Radix\n");
157 else
158 seq_printf(m, "MMU\t\t: Hash\n");
159}
160
161static void pnv_prepare_going_down(void)
162{
163
164
165
166
167 opal_event_shutdown();
168
169
170 local_irq_disable();
171
172
173
174
175
176
177
178
179 opal_flash_term_callback();
180}
181
182static void __noreturn pnv_restart(char *cmd)
183{
184 long rc = OPAL_BUSY;
185
186 pnv_prepare_going_down();
187
188 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
189 rc = opal_cec_reboot();
190 if (rc == OPAL_BUSY_EVENT)
191 opal_poll_events(NULL);
192 else
193 mdelay(10);
194 }
195 for (;;)
196 opal_poll_events(NULL);
197}
198
199static void __noreturn pnv_power_off(void)
200{
201 long rc = OPAL_BUSY;
202
203 pnv_prepare_going_down();
204
205 while (rc == OPAL_BUSY || rc == OPAL_BUSY_EVENT) {
206 rc = opal_cec_power_down(0);
207 if (rc == OPAL_BUSY_EVENT)
208 opal_poll_events(NULL);
209 else
210 mdelay(10);
211 }
212 for (;;)
213 opal_poll_events(NULL);
214}
215
216static void __noreturn pnv_halt(void)
217{
218 pnv_power_off();
219}
220
221static void pnv_progress(char *s, unsigned short hex)
222{
223}
224
225static void pnv_shutdown(void)
226{
227
228 pnv_pci_shutdown();
229
230
231
232
233
234
235 opal_shutdown();
236}
237
238#ifdef CONFIG_KEXEC_CORE
239static void pnv_kexec_wait_secondaries_down(void)
240{
241 int my_cpu, i, notified = -1;
242
243 my_cpu = get_cpu();
244
245 for_each_online_cpu(i) {
246 uint8_t status;
247 int64_t rc, timeout = 1000;
248
249 if (i == my_cpu)
250 continue;
251
252 for (;;) {
253 rc = opal_query_cpu_status(get_hard_smp_processor_id(i),
254 &status);
255 if (rc != OPAL_SUCCESS || status != OPAL_THREAD_STARTED)
256 break;
257 barrier();
258 if (i != notified) {
259 printk(KERN_INFO "kexec: waiting for cpu %d "
260 "(physical %d) to enter OPAL\n",
261 i, paca[i].hw_cpu_id);
262 notified = i;
263 }
264
265
266
267
268
269 mdelay(1);
270 if (timeout-- == 0) {
271 printk(KERN_ERR "kexec: timed out waiting for "
272 "cpu %d (physical %d) to enter OPAL\n",
273 i, paca[i].hw_cpu_id);
274 break;
275 }
276 }
277 }
278}
279
280static void pnv_kexec_cpu_down(int crash_shutdown, int secondary)
281{
282 u64 reinit_flags;
283
284 if (xive_enabled())
285 xive_kexec_teardown_cpu(secondary);
286 else
287 xics_kexec_teardown_cpu(secondary);
288
289
290 if (!firmware_has_feature(FW_FEATURE_OPAL))
291 return;
292
293 if (secondary) {
294
295 mb();
296 get_paca()->kexec_state = KEXEC_STATE_REAL_MODE;
297 mb();
298
299
300 opal_return_cpu();
301 } else {
302
303 pnv_kexec_wait_secondaries_down();
304
305
306 if (xive_enabled())
307 xive_shutdown();
308
309
310
311
312
313
314
315
316
317 reinit_flags = OPAL_REINIT_CPUS_HILE_BE;
318 if (cpu_has_feature(CPU_FTR_ARCH_300))
319 reinit_flags |= OPAL_REINIT_CPUS_MMU_RADIX |
320 OPAL_REINIT_CPUS_MMU_HASH;
321 opal_reinit_cpus(reinit_flags);
322 }
323}
324#endif
325
326#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
327static unsigned long pnv_memory_block_size(void)
328{
329
330
331
332
333
334 if (radix_enabled())
335 return 1UL * 1024 * 1024 * 1024;
336 else
337 return 256UL * 1024 * 1024;
338}
339#endif
340
341static void __init pnv_setup_machdep_opal(void)
342{
343 ppc_md.get_boot_time = opal_get_boot_time;
344 ppc_md.restart = pnv_restart;
345 pm_power_off = pnv_power_off;
346 ppc_md.halt = pnv_halt;
347
348 ppc_md.machine_check_exception = opal_machine_check;
349 ppc_md.mce_check_early_recovery = opal_mce_check_early_recovery;
350 ppc_md.hmi_exception_early = opal_hmi_exception_early;
351 ppc_md.handle_hmi_exception = opal_handle_hmi_exception;
352}
353
354static int __init pnv_probe(void)
355{
356 if (!of_machine_is_compatible("ibm,powernv"))
357 return 0;
358
359 if (firmware_has_feature(FW_FEATURE_OPAL))
360 pnv_setup_machdep_opal();
361
362 pr_debug("PowerNV detected !\n");
363
364 pnv_init();
365
366 return 1;
367}
368
369#ifdef CONFIG_PPC_TRANSACTIONAL_MEM
370void __init pnv_tm_init(void)
371{
372 if (!firmware_has_feature(FW_FEATURE_OPAL) ||
373 !pvr_version_is(PVR_POWER9) ||
374 early_cpu_has_feature(CPU_FTR_TM))
375 return;
376
377 if (opal_reinit_cpus(OPAL_REINIT_CPUS_TM_SUSPEND_DISABLED) != OPAL_SUCCESS)
378 return;
379
380 pr_info("Enabling TM (Transactional Memory) with Suspend Disabled\n");
381 cur_cpu_spec->cpu_features |= CPU_FTR_TM;
382
383 cur_cpu_spec->cpu_user_features2 &= ~PPC_FEATURE2_HTM;
384
385 cur_cpu_spec->cpu_user_features2 |= PPC_FEATURE2_HTM_NO_SUSPEND | \
386 PPC_FEATURE2_HTM_NOSC;
387 tm_suspend_disabled = true;
388}
389#endif
390
391
392
393
394
395static unsigned long pnv_get_proc_freq(unsigned int cpu)
396{
397 unsigned long ret_freq;
398
399 ret_freq = cpufreq_get(cpu) * 1000ul;
400
401
402
403
404
405 if (!ret_freq)
406 ret_freq = ppc_proc_freq;
407 return ret_freq;
408}
409
410define_machine(powernv) {
411 .name = "PowerNV",
412 .probe = pnv_probe,
413 .setup_arch = pnv_setup_arch,
414 .init_IRQ = pnv_init_IRQ,
415 .show_cpuinfo = pnv_show_cpuinfo,
416 .get_proc_freq = pnv_get_proc_freq,
417 .progress = pnv_progress,
418 .machine_shutdown = pnv_shutdown,
419 .power_save = NULL,
420 .calibrate_decr = generic_calibrate_decr,
421#ifdef CONFIG_KEXEC_CORE
422 .kexec_cpu_down = pnv_kexec_cpu_down,
423#endif
424#ifdef CONFIG_MEMORY_HOTPLUG_SPARSE
425 .memory_block_size = pnv_memory_block_size,
426#endif
427};
428