aboutsummaryrefslogtreecommitdiff
path: root/services/std_svc/psci/psci_main.c
blob: 0ffa5d739ea8c46b0ecdbf5f90d51968ceecd669 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
/*
 * Copyright (c) 2013-2014, ARM Limited and Contributors. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * Redistributions of source code must retain the above copyright notice, this
 * list of conditions and the following disclaimer.
 *
 * Redistributions in binary form must reproduce the above copyright notice,
 * this list of conditions and the following disclaimer in the documentation
 * and/or other materials provided with the distribution.
 *
 * Neither the name of ARM nor the names of its contributors may be used
 * to endorse or promote products derived from this software without specific
 * prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
 * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
 * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
 * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */

#include <arch.h>
#include <arch_helpers.h>
#include <assert.h>
#include <runtime_svc.h>
#include <debug.h>
#include "psci_private.h"

/*******************************************************************************
 * PSCI frontend api for servicing SMCs. Described in the PSCI spec.
 ******************************************************************************/
int psci_cpu_on(unsigned long target_cpu,
		unsigned long entrypoint,
		unsigned long context_id)

{
	int rc;
	unsigned int start_afflvl, end_afflvl;

	/* Determine if the cpu exists of not */
	rc = psci_validate_mpidr(target_cpu, MPIDR_AFFLVL0);
	if (rc != PSCI_E_SUCCESS) {
		goto exit;
	}

	/*
	 * To turn this cpu on, specify which affinity
	 * levels need to be turned on
	 */
	start_afflvl = MPIDR_AFFLVL0;
	end_afflvl = get_max_afflvl();
	rc = psci_afflvl_on(target_cpu,
			    entrypoint,
			    context_id,
			    start_afflvl,
			    end_afflvl);

exit:
	return rc;
}

unsigned int psci_version(void)
{
	return PSCI_MAJOR_VER | PSCI_MINOR_VER;
}

int psci_cpu_suspend(unsigned int power_state,
		     unsigned long entrypoint,
		     unsigned long context_id)
{
	int rc;
	unsigned int target_afflvl, pstate_type;

	/* Check SBZ bits in power state are zero */
	if (psci_validate_power_state(power_state))
		return PSCI_E_INVALID_PARAMS;

	/* Sanity check the requested state */
	target_afflvl = psci_get_pstate_afflvl(power_state);
	if (target_afflvl > MPIDR_MAX_AFFLVL)
		return PSCI_E_INVALID_PARAMS;

	/* Determine the 'state type' in the 'power_state' parameter */
	pstate_type = psci_get_pstate_type(power_state);

	/*
	 * Ensure that we have a platform specific handler for entering
	 * a standby state.
	 */
	if (pstate_type == PSTATE_TYPE_STANDBY) {
		if  (!psci_plat_pm_ops->affinst_standby)
			return PSCI_E_INVALID_PARAMS;

		rc = psci_plat_pm_ops->affinst_standby(power_state);
		assert(rc == PSCI_E_INVALID_PARAMS || rc == PSCI_E_SUCCESS);
		return rc;
	}

	/*
	 * Do what is needed to enter the power down state. Upon success,
	 * enter the final wfi which will power down this cpu else return
	 * an error.
	 */
	rc = psci_afflvl_suspend(entrypoint,
				 context_id,
				 power_state,
				 MPIDR_AFFLVL0,
				 target_afflvl);
	if (rc == PSCI_E_SUCCESS)
		psci_power_down_wfi();
	assert(rc == PSCI_E_INVALID_PARAMS);
	return rc;
}

int psci_cpu_off(void)
{
	int rc;
	int target_afflvl = get_max_afflvl();

	/*
	 * Traverse from the highest to the lowest affinity level. When the
	 * lowest affinity level is hit, all the locks are acquired. State
	 * management is done immediately followed by cpu, cluster ...
	 * ..target_afflvl specific actions as this function unwinds back.
	 */
	rc = psci_afflvl_off(MPIDR_AFFLVL0, target_afflvl);

	/*
	 * Check if all actions needed to safely power down this cpu have
	 * successfully completed. Enter a wfi loop which will allow the
	 * power controller to physically power down this cpu.
	 */
	if (rc == PSCI_E_SUCCESS)
		psci_power_down_wfi();

	/*
	 * The only error cpu_off can return is E_DENIED. So check if that's
	 * indeed the case.
	 */
	assert (rc == PSCI_E_DENIED);

	return rc;
}

int psci_affinity_info(unsigned long target_affinity,
		       unsigned int lowest_affinity_level)
{
	int rc = PSCI_E_INVALID_PARAMS;
	unsigned int aff_state;
	aff_map_node_t *node;

	if (lowest_affinity_level > get_max_afflvl())
		return rc;

	node = psci_get_aff_map_node(target_affinity, lowest_affinity_level);
	if (node && (node->state & PSCI_AFF_PRESENT)) {

		/*
		 * TODO: For affinity levels higher than 0 i.e. cpu, the
		 * state will always be either ON or OFF. Need to investigate
		 * how critical is it to support ON_PENDING here.
		 */
		aff_state = psci_get_state(node);

		/* A suspended cpu is available & on for the OS */
		if (aff_state == PSCI_STATE_SUSPEND) {
			aff_state = PSCI_STATE_ON;
		}

		rc = aff_state;
	}

	return rc;
}

/* Unimplemented */
int psci_migrate(unsigned int target_cpu)
{
	return PSCI_E_NOT_SUPPORTED;
}

/* Unimplemented */
unsigned int psci_migrate_info_type(void)
{
	return PSCI_TOS_NOT_PRESENT_MP;
}

unsigned long psci_migrate_info_up_cpu(void)
{
	/*
	 * Return value of this currently unsupported call depends upon
	 * what psci_migrate_info_type() returns.
	 */
	return PSCI_E_SUCCESS;
}

/*******************************************************************************
 * PSCI top level handler for servicing SMCs.
 ******************************************************************************/
uint64_t psci_smc_handler(uint32_t smc_fid,
			  uint64_t x1,
			  uint64_t x2,
			  uint64_t x3,
			  uint64_t x4,
			  void *cookie,
			  void *handle,
			  uint64_t flags)
{
	if (is_caller_secure(flags))
		SMC_RET1(handle, SMC_UNK);

	if (((smc_fid >> FUNCID_CC_SHIFT) & FUNCID_CC_MASK) == SMC_32) {
		/* 32-bit PSCI function, clear top parameter bits */

		x1 = (uint32_t)x1;
		x2 = (uint32_t)x2;
		x3 = (uint32_t)x3;

		switch (smc_fid) {
		case PSCI_VERSION:
			SMC_RET1(handle, psci_version());

		case PSCI_CPU_OFF:
			SMC_RET1(handle, psci_cpu_off());

		case PSCI_CPU_SUSPEND_AARCH32:
			SMC_RET1(handle, psci_cpu_suspend(x1, x2, x3));

		case PSCI_CPU_ON_AARCH32:
			SMC_RET1(handle, psci_cpu_on(x1, x2, x3));

		case PSCI_AFFINITY_INFO_AARCH32:
			SMC_RET1(handle, psci_affinity_info(x1, x2));

		case PSCI_MIG_AARCH32:
			SMC_RET1(handle, psci_migrate(x1));

		case PSCI_MIG_INFO_TYPE:
			SMC_RET1(handle, psci_migrate_info_type());

		case PSCI_MIG_INFO_UP_CPU_AARCH32:
			SMC_RET1(handle, psci_migrate_info_up_cpu());

		case PSCI_SYSTEM_OFF:
			psci_system_off();
			/* We should never return from psci_system_off() */

		case PSCI_SYSTEM_RESET:
			psci_system_reset();
			/* We should never return from psci_system_reset() */

		default:
			break;
		}
	} else {
		/* 64-bit PSCI function */

		switch (smc_fid) {
		case PSCI_CPU_SUSPEND_AARCH64:
			SMC_RET1(handle, psci_cpu_suspend(x1, x2, x3));

		case PSCI_CPU_ON_AARCH64:
			SMC_RET1(handle, psci_cpu_on(x1, x2, x3));

		case PSCI_AFFINITY_INFO_AARCH64:
			SMC_RET1(handle, psci_affinity_info(x1, x2));

		case PSCI_MIG_AARCH64:
			SMC_RET1(handle, psci_migrate(x1));

		case PSCI_MIG_INFO_UP_CPU_AARCH64:
			SMC_RET1(handle, psci_migrate_info_up_cpu());

		default:
			break;
		}
	}

	WARN("Unimplemented PSCI Call: 0x%x \n", smc_fid);
	SMC_RET1(handle, SMC_UNK);
}