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1 /*
2  * Copyright (c) 2013-2019, ARM Limited and Contributors. All rights reserved.
3  *
4  * SPDX-License-Identifier: BSD-3-Clause
5  */
6 
7 #include <assert.h>
8 #include <string.h>
9 
10 #include <arch.h>
11 #include <arch_helpers.h>
12 #include <common/debug.h>
13 #include <lib/pmf/pmf.h>
14 #include <lib/runtime_instr.h>
15 #include <lib/smccc.h>
16 #include <plat/common/platform.h>
17 #include <services/arm_arch_svc.h>
18 
19 #include "psci_private.h"
20 
21 /*******************************************************************************
22  * PSCI frontend api for servicing SMCs. Described in the PSCI spec.
23  ******************************************************************************/
psci_cpu_on(u_register_t target_cpu,uintptr_t entrypoint,u_register_t context_id)24 int psci_cpu_on(u_register_t target_cpu,
25 		uintptr_t entrypoint,
26 		u_register_t context_id)
27 
28 {
29 	int rc;
30 	entry_point_info_t ep;
31 
32 	/* Determine if the cpu exists of not */
33 	rc = psci_validate_mpidr(target_cpu);
34 	if (rc != PSCI_E_SUCCESS)
35 		return PSCI_E_INVALID_PARAMS;
36 
37 	/* Validate the entry point and get the entry_point_info */
38 	rc = psci_validate_entry_point(&ep, entrypoint, context_id);
39 	if (rc != PSCI_E_SUCCESS)
40 		return rc;
41 
42 	/*
43 	 * To turn this cpu on, specify which power
44 	 * levels need to be turned on
45 	 */
46 	return psci_cpu_on_start(target_cpu, &ep);
47 }
48 
psci_version(void)49 unsigned int psci_version(void)
50 {
51 	return PSCI_MAJOR_VER | PSCI_MINOR_VER;
52 }
53 
psci_cpu_suspend(unsigned int power_state,uintptr_t entrypoint,u_register_t context_id)54 int psci_cpu_suspend(unsigned int power_state,
55 		     uintptr_t entrypoint,
56 		     u_register_t context_id)
57 {
58 	int rc;
59 	unsigned int target_pwrlvl, is_power_down_state;
60 	entry_point_info_t ep;
61 	psci_power_state_t state_info = { {PSCI_LOCAL_STATE_RUN} };
62 	plat_local_state_t cpu_pd_state;
63 
64 	/* Validate the power_state parameter */
65 	rc = psci_validate_power_state(power_state, &state_info);
66 	if (rc != PSCI_E_SUCCESS) {
67 		assert(rc == PSCI_E_INVALID_PARAMS);
68 		return rc;
69 	}
70 
71 	/*
72 	 * Get the value of the state type bit from the power state parameter.
73 	 */
74 	is_power_down_state = psci_get_pstate_type(power_state);
75 
76 	/* Sanity check the requested suspend levels */
77 	assert(psci_validate_suspend_req(&state_info, is_power_down_state)
78 			== PSCI_E_SUCCESS);
79 
80 	target_pwrlvl = psci_find_target_suspend_lvl(&state_info);
81 	if (target_pwrlvl == PSCI_INVALID_PWR_LVL) {
82 		ERROR("Invalid target power level for suspend operation\n");
83 		panic();
84 	}
85 
86 	/* Fast path for CPU standby.*/
87 	if (is_cpu_standby_req(is_power_down_state, target_pwrlvl)) {
88 		if  (psci_plat_pm_ops->cpu_standby == NULL)
89 			return PSCI_E_INVALID_PARAMS;
90 
91 		/*
92 		 * Set the state of the CPU power domain to the platform
93 		 * specific retention state and enter the standby state.
94 		 */
95 		cpu_pd_state = state_info.pwr_domain_state[PSCI_CPU_PWR_LVL];
96 		psci_set_cpu_local_state(cpu_pd_state);
97 
98 #if ENABLE_PSCI_STAT
99 		plat_psci_stat_accounting_start(&state_info);
100 #endif
101 
102 #if ENABLE_RUNTIME_INSTRUMENTATION
103 		PMF_CAPTURE_TIMESTAMP(rt_instr_svc,
104 		    RT_INSTR_ENTER_HW_LOW_PWR,
105 		    PMF_NO_CACHE_MAINT);
106 #endif
107 
108 		psci_plat_pm_ops->cpu_standby(cpu_pd_state);
109 
110 		/* Upon exit from standby, set the state back to RUN. */
111 		psci_set_cpu_local_state(PSCI_LOCAL_STATE_RUN);
112 
113 #if ENABLE_RUNTIME_INSTRUMENTATION
114 		PMF_CAPTURE_TIMESTAMP(rt_instr_svc,
115 		    RT_INSTR_EXIT_HW_LOW_PWR,
116 		    PMF_NO_CACHE_MAINT);
117 #endif
118 
119 #if ENABLE_PSCI_STAT
120 		plat_psci_stat_accounting_stop(&state_info);
121 
122 		/* Update PSCI stats */
123 		psci_stats_update_pwr_up(PSCI_CPU_PWR_LVL, &state_info);
124 #endif
125 
126 		return PSCI_E_SUCCESS;
127 	}
128 
129 	/*
130 	 * If a power down state has been requested, we need to verify entry
131 	 * point and program entry information.
132 	 */
133 	if (is_power_down_state != 0U) {
134 		rc = psci_validate_entry_point(&ep, entrypoint, context_id);
135 		if (rc != PSCI_E_SUCCESS)
136 			return rc;
137 	}
138 
139 	/*
140 	 * Do what is needed to enter the power down state. Upon success,
141 	 * enter the final wfi which will power down this CPU. This function
142 	 * might return if the power down was abandoned for any reason, e.g.
143 	 * arrival of an interrupt
144 	 */
145 	psci_cpu_suspend_start(&ep,
146 			    target_pwrlvl,
147 			    &state_info,
148 			    is_power_down_state);
149 
150 	return PSCI_E_SUCCESS;
151 }
152 
153 
psci_system_suspend(uintptr_t entrypoint,u_register_t context_id)154 int psci_system_suspend(uintptr_t entrypoint, u_register_t context_id)
155 {
156 	int rc;
157 	psci_power_state_t state_info;
158 	entry_point_info_t ep;
159 
160 	/* Check if the current CPU is the last ON CPU in the system */
161 	if (psci_is_last_on_cpu() == 0U)
162 		return PSCI_E_DENIED;
163 
164 	/* Validate the entry point and get the entry_point_info */
165 	rc = psci_validate_entry_point(&ep, entrypoint, context_id);
166 	if (rc != PSCI_E_SUCCESS)
167 		return rc;
168 
169 	/* Query the psci_power_state for system suspend */
170 	psci_query_sys_suspend_pwrstate(&state_info);
171 
172 	/*
173 	 * Check if platform allows suspend to Highest power level
174 	 * (System level)
175 	 */
176 	if (psci_find_target_suspend_lvl(&state_info) < PLAT_MAX_PWR_LVL)
177 		return PSCI_E_DENIED;
178 
179 	/* Ensure that the psci_power_state makes sense */
180 	assert(psci_validate_suspend_req(&state_info, PSTATE_TYPE_POWERDOWN)
181 						== PSCI_E_SUCCESS);
182 	assert(is_local_state_off(
183 			state_info.pwr_domain_state[PLAT_MAX_PWR_LVL]) != 0);
184 
185 	/*
186 	 * Do what is needed to enter the system suspend state. This function
187 	 * might return if the power down was abandoned for any reason, e.g.
188 	 * arrival of an interrupt
189 	 */
190 	psci_cpu_suspend_start(&ep,
191 			    PLAT_MAX_PWR_LVL,
192 			    &state_info,
193 			    PSTATE_TYPE_POWERDOWN);
194 
195 	return PSCI_E_SUCCESS;
196 }
197 
psci_cpu_off(void)198 int psci_cpu_off(void)
199 {
200 	int rc;
201 	unsigned int target_pwrlvl = PLAT_MAX_PWR_LVL;
202 
203 	/*
204 	 * Do what is needed to power off this CPU and possible higher power
205 	 * levels if it able to do so. Upon success, enter the final wfi
206 	 * which will power down this CPU.
207 	 */
208 	rc = psci_do_cpu_off(target_pwrlvl);
209 
210 	/*
211 	 * The only error cpu_off can return is E_DENIED. So check if that's
212 	 * indeed the case.
213 	 */
214 	assert(rc == PSCI_E_DENIED);
215 
216 	return rc;
217 }
218 
psci_affinity_info(u_register_t target_affinity,unsigned int lowest_affinity_level)219 int psci_affinity_info(u_register_t target_affinity,
220 		       unsigned int lowest_affinity_level)
221 {
222 	int ret;
223 	unsigned int target_idx;
224 
225 	/* We dont support level higher than PSCI_CPU_PWR_LVL */
226 	if (lowest_affinity_level > PSCI_CPU_PWR_LVL)
227 		return PSCI_E_INVALID_PARAMS;
228 
229 	/* Calculate the cpu index of the target */
230 	ret = plat_core_pos_by_mpidr(target_affinity);
231 	if (ret == -1) {
232 		return PSCI_E_INVALID_PARAMS;
233 	}
234 	target_idx = (unsigned int)ret;
235 
236 	/*
237 	 * Generic management:
238 	 * Perform cache maintanence ahead of reading the target CPU state to
239 	 * ensure that the data is not stale.
240 	 * There is a theoretical edge case where the cache may contain stale
241 	 * data for the target CPU data - this can occur under the following
242 	 * conditions:
243 	 * - the target CPU is in another cluster from the current
244 	 * - the target CPU was the last CPU to shutdown on its cluster
245 	 * - the cluster was removed from coherency as part of the CPU shutdown
246 	 *
247 	 * In this case the cache maintenace that was performed as part of the
248 	 * target CPUs shutdown was not seen by the current CPU's cluster. And
249 	 * so the cache may contain stale data for the target CPU.
250 	 */
251 	flush_cpu_data_by_index(target_idx,
252 				psci_svc_cpu_data.aff_info_state);
253 
254 	return psci_get_aff_info_state_by_idx(target_idx);
255 }
256 
psci_migrate(u_register_t target_cpu)257 int psci_migrate(u_register_t target_cpu)
258 {
259 	int rc;
260 	u_register_t resident_cpu_mpidr;
261 
262 	rc = psci_spd_migrate_info(&resident_cpu_mpidr);
263 	if (rc != PSCI_TOS_UP_MIG_CAP)
264 		return (rc == PSCI_TOS_NOT_UP_MIG_CAP) ?
265 			  PSCI_E_DENIED : PSCI_E_NOT_SUPPORTED;
266 
267 	/*
268 	 * Migrate should only be invoked on the CPU where
269 	 * the Secure OS is resident.
270 	 */
271 	if (resident_cpu_mpidr != read_mpidr_el1())
272 		return PSCI_E_NOT_PRESENT;
273 
274 	/* Check the validity of the specified target cpu */
275 	rc = psci_validate_mpidr(target_cpu);
276 	if (rc != PSCI_E_SUCCESS)
277 		return PSCI_E_INVALID_PARAMS;
278 
279 	assert((psci_spd_pm != NULL) && (psci_spd_pm->svc_migrate != NULL));
280 
281 	rc = psci_spd_pm->svc_migrate(read_mpidr_el1(), target_cpu);
282 	assert((rc == PSCI_E_SUCCESS) || (rc == PSCI_E_INTERN_FAIL));
283 
284 	return rc;
285 }
286 
psci_migrate_info_type(void)287 int psci_migrate_info_type(void)
288 {
289 	u_register_t resident_cpu_mpidr;
290 
291 	return psci_spd_migrate_info(&resident_cpu_mpidr);
292 }
293 
psci_migrate_info_up_cpu(void)294 u_register_t psci_migrate_info_up_cpu(void)
295 {
296 	u_register_t resident_cpu_mpidr;
297 	int rc;
298 
299 	/*
300 	 * Return value of this depends upon what
301 	 * psci_spd_migrate_info() returns.
302 	 */
303 	rc = psci_spd_migrate_info(&resident_cpu_mpidr);
304 	if ((rc != PSCI_TOS_NOT_UP_MIG_CAP) && (rc != PSCI_TOS_UP_MIG_CAP))
305 		return (u_register_t)(register_t) PSCI_E_INVALID_PARAMS;
306 
307 	return resident_cpu_mpidr;
308 }
309 
psci_node_hw_state(u_register_t target_cpu,unsigned int power_level)310 int psci_node_hw_state(u_register_t target_cpu,
311 		       unsigned int power_level)
312 {
313 	int rc;
314 
315 	/* Validate target_cpu */
316 	rc = psci_validate_mpidr(target_cpu);
317 	if (rc != PSCI_E_SUCCESS)
318 		return PSCI_E_INVALID_PARAMS;
319 
320 	/* Validate power_level against PLAT_MAX_PWR_LVL */
321 	if (power_level > PLAT_MAX_PWR_LVL)
322 		return PSCI_E_INVALID_PARAMS;
323 
324 	/*
325 	 * Dispatch this call to platform to query power controller, and pass on
326 	 * to the caller what it returns
327 	 */
328 	assert(psci_plat_pm_ops->get_node_hw_state != NULL);
329 	rc = psci_plat_pm_ops->get_node_hw_state(target_cpu, power_level);
330 	assert(((rc >= HW_ON) && (rc <= HW_STANDBY))
331 		|| (rc == PSCI_E_NOT_SUPPORTED)
332 		|| (rc == PSCI_E_INVALID_PARAMS));
333 	return rc;
334 }
335 
psci_features(unsigned int psci_fid)336 int psci_features(unsigned int psci_fid)
337 {
338 	unsigned int local_caps = psci_caps;
339 
340 	if (psci_fid == SMCCC_VERSION)
341 		return PSCI_E_SUCCESS;
342 
343 	/* Check if it is a 64 bit function */
344 	if (((psci_fid >> FUNCID_CC_SHIFT) & FUNCID_CC_MASK) == SMC_64)
345 		local_caps &= PSCI_CAP_64BIT_MASK;
346 
347 	/* Check for invalid fid */
348 	if (!(is_std_svc_call(psci_fid) && is_valid_fast_smc(psci_fid)
349 			&& is_psci_fid(psci_fid)))
350 		return PSCI_E_NOT_SUPPORTED;
351 
352 
353 	/* Check if the psci fid is supported or not */
354 	if ((local_caps & define_psci_cap(psci_fid)) == 0U)
355 		return PSCI_E_NOT_SUPPORTED;
356 
357 	/* Format the feature flags */
358 	if ((psci_fid == PSCI_CPU_SUSPEND_AARCH32) ||
359 	    (psci_fid == PSCI_CPU_SUSPEND_AARCH64)) {
360 		/*
361 		 * The trusted firmware does not support OS Initiated Mode.
362 		 */
363 		unsigned int ret = ((FF_PSTATE << FF_PSTATE_SHIFT) |
364 			(((FF_SUPPORTS_OS_INIT_MODE == 1U) ? 0U : 1U)
365 				<< FF_MODE_SUPPORT_SHIFT));
366 		return (int) ret;
367 	}
368 
369 	/* Return 0 for all other fid's */
370 	return PSCI_E_SUCCESS;
371 }
372 
373 /*******************************************************************************
374  * PSCI top level handler for servicing SMCs.
375  ******************************************************************************/
psci_smc_handler(uint32_t smc_fid,u_register_t x1,u_register_t x2,u_register_t x3,u_register_t x4,void * cookie,void * handle,u_register_t flags)376 u_register_t psci_smc_handler(uint32_t smc_fid,
377 			  u_register_t x1,
378 			  u_register_t x2,
379 			  u_register_t x3,
380 			  u_register_t x4,
381 			  void *cookie,
382 			  void *handle,
383 			  u_register_t flags)
384 {
385 	u_register_t ret;
386 
387 	if (is_caller_secure(flags))
388 		return (u_register_t)SMC_UNK;
389 
390 	/* Check the fid against the capabilities */
391 	if ((psci_caps & define_psci_cap(smc_fid)) == 0U)
392 		return (u_register_t)SMC_UNK;
393 
394 	if (((smc_fid >> FUNCID_CC_SHIFT) & FUNCID_CC_MASK) == SMC_32) {
395 		/* 32-bit PSCI function, clear top parameter bits */
396 
397 		uint32_t r1 = (uint32_t)x1;
398 		uint32_t r2 = (uint32_t)x2;
399 		uint32_t r3 = (uint32_t)x3;
400 
401 		switch (smc_fid) {
402 		case PSCI_VERSION:
403 			ret = (u_register_t)psci_version();
404 			break;
405 
406 		case PSCI_CPU_OFF:
407 			ret = (u_register_t)psci_cpu_off();
408 			break;
409 
410 		case PSCI_CPU_SUSPEND_AARCH32:
411 			ret = (u_register_t)psci_cpu_suspend(r1, r2, r3);
412 			break;
413 
414 		case PSCI_CPU_ON_AARCH32:
415 			ret = (u_register_t)psci_cpu_on(r1, r2, r3);
416 			break;
417 
418 		case PSCI_AFFINITY_INFO_AARCH32:
419 			ret = (u_register_t)psci_affinity_info(r1, r2);
420 			break;
421 
422 		case PSCI_MIG_AARCH32:
423 			ret = (u_register_t)psci_migrate(r1);
424 			break;
425 
426 		case PSCI_MIG_INFO_TYPE:
427 			ret = (u_register_t)psci_migrate_info_type();
428 			break;
429 
430 		case PSCI_MIG_INFO_UP_CPU_AARCH32:
431 			ret = psci_migrate_info_up_cpu();
432 			break;
433 
434 		case PSCI_NODE_HW_STATE_AARCH32:
435 			ret = (u_register_t)psci_node_hw_state(r1, r2);
436 			break;
437 
438 		case PSCI_SYSTEM_SUSPEND_AARCH32:
439 			ret = (u_register_t)psci_system_suspend(r1, r2);
440 			break;
441 
442 		case PSCI_SYSTEM_OFF:
443 			psci_system_off();
444 			/* We should never return from psci_system_off() */
445 			break;
446 
447 		case PSCI_SYSTEM_RESET:
448 			psci_system_reset();
449 			/* We should never return from psci_system_reset() */
450 			break;
451 
452 		case PSCI_FEATURES:
453 			ret = (u_register_t)psci_features(r1);
454 			break;
455 
456 #if ENABLE_PSCI_STAT
457 		case PSCI_STAT_RESIDENCY_AARCH32:
458 			ret = psci_stat_residency(r1, r2);
459 			break;
460 
461 		case PSCI_STAT_COUNT_AARCH32:
462 			ret = psci_stat_count(r1, r2);
463 			break;
464 #endif
465 		case PSCI_MEM_PROTECT:
466 			ret = psci_mem_protect(r1);
467 			break;
468 
469 		case PSCI_MEM_CHK_RANGE_AARCH32:
470 			ret = psci_mem_chk_range(r1, r2);
471 			break;
472 
473 		case PSCI_SYSTEM_RESET2_AARCH32:
474 			/* We should never return from psci_system_reset2() */
475 			ret = psci_system_reset2(r1, r2);
476 			break;
477 
478 		default:
479 			WARN("Unimplemented PSCI Call: 0x%x\n", smc_fid);
480 			ret = (u_register_t)SMC_UNK;
481 			break;
482 		}
483 	} else {
484 		/* 64-bit PSCI function */
485 
486 		switch (smc_fid) {
487 		case PSCI_CPU_SUSPEND_AARCH64:
488 			ret = (u_register_t)
489 				psci_cpu_suspend((unsigned int)x1, x2, x3);
490 			break;
491 
492 		case PSCI_CPU_ON_AARCH64:
493 			ret = (u_register_t)psci_cpu_on(x1, x2, x3);
494 			break;
495 
496 		case PSCI_AFFINITY_INFO_AARCH64:
497 			ret = (u_register_t)
498 				psci_affinity_info(x1, (unsigned int)x2);
499 			break;
500 
501 		case PSCI_MIG_AARCH64:
502 			ret = (u_register_t)psci_migrate(x1);
503 			break;
504 
505 		case PSCI_MIG_INFO_UP_CPU_AARCH64:
506 			ret = psci_migrate_info_up_cpu();
507 			break;
508 
509 		case PSCI_NODE_HW_STATE_AARCH64:
510 			ret = (u_register_t)psci_node_hw_state(
511 					x1, (unsigned int) x2);
512 			break;
513 
514 		case PSCI_SYSTEM_SUSPEND_AARCH64:
515 			ret = (u_register_t)psci_system_suspend(x1, x2);
516 			break;
517 
518 #if ENABLE_PSCI_STAT
519 		case PSCI_STAT_RESIDENCY_AARCH64:
520 			ret = psci_stat_residency(x1, (unsigned int) x2);
521 			break;
522 
523 		case PSCI_STAT_COUNT_AARCH64:
524 			ret = psci_stat_count(x1, (unsigned int) x2);
525 			break;
526 #endif
527 
528 		case PSCI_MEM_CHK_RANGE_AARCH64:
529 			ret = psci_mem_chk_range(x1, x2);
530 			break;
531 
532 		case PSCI_SYSTEM_RESET2_AARCH64:
533 			/* We should never return from psci_system_reset2() */
534 			ret = psci_system_reset2((uint32_t) x1, x2);
535 			break;
536 
537 		default:
538 			WARN("Unimplemented PSCI Call: 0x%x\n", smc_fid);
539 			ret = (u_register_t)SMC_UNK;
540 			break;
541 		}
542 	}
543 
544 	return ret;
545 }
546