summaryrefslogtreecommitdiffstats
path: root/drivers/acpi/nfit/intel.c
blob: bb033b74bff0d11e789f7e8b3b7931cafaec38ef (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
// SPDX-License-Identifier: GPL-2.0
/* Copyright(c) 2018 Intel Corporation. All rights reserved. */
#include <linux/libnvdimm.h>
#include <linux/ndctl.h>
#include <linux/acpi.h>
#include <asm/smp.h>
#include "intel.h"
#include "nfit.h"

static enum nvdimm_security_state intel_security_state(struct nvdimm *nvdimm)
{
	struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
	struct {
		struct nd_cmd_pkg pkg;
		struct nd_intel_get_security_state cmd;
	} nd_cmd = {
		.pkg = {
			.nd_command = NVDIMM_INTEL_GET_SECURITY_STATE,
			.nd_family = NVDIMM_FAMILY_INTEL,
			.nd_size_out =
				sizeof(struct nd_intel_get_security_state),
			.nd_fw_size =
				sizeof(struct nd_intel_get_security_state),
		},
	};
	int rc;

	if (!test_bit(NVDIMM_INTEL_GET_SECURITY_STATE, &nfit_mem->dsm_mask))
		return -ENXIO;

	rc = nvdimm_ctl(nvdimm, ND_CMD_CALL, &nd_cmd, sizeof(nd_cmd), NULL);
	if (rc < 0)
		return rc;
	if (nd_cmd.cmd.status)
		return -EIO;

	/* check and see if security is enabled and locked */
	if (nd_cmd.cmd.state & ND_INTEL_SEC_STATE_UNSUPPORTED)
		return -ENXIO;
	else if (nd_cmd.cmd.state & ND_INTEL_SEC_STATE_ENABLED) {
		if (nd_cmd.cmd.state & ND_INTEL_SEC_STATE_LOCKED)
			return NVDIMM_SECURITY_LOCKED;
		else if (nd_cmd.cmd.state & ND_INTEL_SEC_STATE_FROZEN ||
				nd_cmd.cmd.state & ND_INTEL_SEC_STATE_PLIMIT)
			return NVDIMM_SECURITY_FROZEN;
		else
			return NVDIMM_SECURITY_UNLOCKED;
	}
	return NVDIMM_SECURITY_DISABLED;
}

static int intel_security_freeze(struct nvdimm *nvdimm)
{
	struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
	struct {
		struct nd_cmd_pkg pkg;
		struct nd_intel_freeze_lock cmd;
	} nd_cmd = {
		.pkg = {
			.nd_command = NVDIMM_INTEL_FREEZE_LOCK,
			.nd_family = NVDIMM_FAMILY_INTEL,
			.nd_size_out = ND_INTEL_STATUS_SIZE,
			.nd_fw_size = ND_INTEL_STATUS_SIZE,
		},
	};
	int rc;

	if (!test_bit(NVDIMM_INTEL_FREEZE_LOCK, &nfit_mem->dsm_mask))
		return -ENOTTY;

	rc = nvdimm_ctl(nvdimm, ND_CMD_CALL, &nd_cmd, sizeof(nd_cmd), NULL);
	if (rc < 0)
		return rc;
	if (nd_cmd.cmd.status)
		return -EIO;
	return 0;
}

static int intel_security_change_key(struct nvdimm *nvdimm,
		const struct nvdimm_key_data *old_data,
		const struct nvdimm_key_data *new_data)
{
	struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
	struct {
		struct nd_cmd_pkg pkg;
		struct nd_intel_set_passphrase cmd;
	} nd_cmd = {
		.pkg = {
			.nd_command = NVDIMM_INTEL_SET_PASSPHRASE,
			.nd_family = NVDIMM_FAMILY_INTEL,
			.nd_size_in = ND_INTEL_PASSPHRASE_SIZE * 2,
			.nd_size_out = ND_INTEL_STATUS_SIZE,
			.nd_fw_size = ND_INTEL_STATUS_SIZE,
		},
	};
	int rc;

	if (!test_bit(NVDIMM_INTEL_SET_PASSPHRASE, &nfit_mem->dsm_mask))
		return -ENOTTY;

	if (old_data)
		memcpy(nd_cmd.cmd.old_pass, old_data->data,
				sizeof(nd_cmd.cmd.old_pass));
	memcpy(nd_cmd.cmd.new_pass, new_data->data,
			sizeof(nd_cmd.cmd.new_pass));
	rc = nvdimm_ctl(nvdimm, ND_CMD_CALL, &nd_cmd, sizeof(nd_cmd), NULL);
	if (rc < 0)
		return rc;

	switch (nd_cmd.cmd.status) {
	case 0:
		return 0;
	case ND_INTEL_STATUS_INVALID_PASS:
		return -EINVAL;
	case ND_INTEL_STATUS_NOT_SUPPORTED:
		return -EOPNOTSUPP;
	case ND_INTEL_STATUS_INVALID_STATE:
	default:
		return -EIO;
	}
}

static void nvdimm_invalidate_cache(void);

static int intel_security_unlock(struct nvdimm *nvdimm,
		const struct nvdimm_key_data *key_data)
{
	struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
	struct {
		struct nd_cmd_pkg pkg;
		struct nd_intel_unlock_unit cmd;
	} nd_cmd = {
		.pkg = {
			.nd_command = NVDIMM_INTEL_UNLOCK_UNIT,
			.nd_family = NVDIMM_FAMILY_INTEL,
			.nd_size_in = ND_INTEL_PASSPHRASE_SIZE,
			.nd_size_out = ND_INTEL_STATUS_SIZE,
			.nd_fw_size = ND_INTEL_STATUS_SIZE,
		},
	};
	int rc;

	if (!test_bit(NVDIMM_INTEL_UNLOCK_UNIT, &nfit_mem->dsm_mask))
		return -ENOTTY;

	memcpy(nd_cmd.cmd.passphrase, key_data->data,
			sizeof(nd_cmd.cmd.passphrase));
	rc = nvdimm_ctl(nvdimm, ND_CMD_CALL, &nd_cmd, sizeof(nd_cmd), NULL);
	if (rc < 0)
		return rc;
	switch (nd_cmd.cmd.status) {
	case 0:
		break;
	case ND_INTEL_STATUS_INVALID_PASS:
		return -EINVAL;
	default:
		return -EIO;
	}

	/* DIMM unlocked, invalidate all CPU caches before we read it */
	nvdimm_invalidate_cache();

	return 0;
}

static int intel_security_disable(struct nvdimm *nvdimm,
		const struct nvdimm_key_data *key_data)
{
	int rc;
	struct nfit_mem *nfit_mem = nvdimm_provider_data(nvdimm);
	struct {
		struct nd_cmd_pkg pkg;
		struct nd_intel_disable_passphrase cmd;
	} nd_cmd = {
		.pkg = {
			.nd_command = NVDIMM_INTEL_DISABLE_PASSPHRASE,
			.nd_family = NVDIMM_FAMILY_INTEL,
			.nd_size_in = ND_INTEL_PASSPHRASE_SIZE,
			.nd_size_out = ND_INTEL_STATUS_SIZE,
			.nd_fw_size = ND_INTEL_STATUS_SIZE,
		},
	};

	if (!test_bit(NVDIMM_INTEL_DISABLE_PASSPHRASE, &nfit_mem->dsm_mask))
		return -ENOTTY;

	memcpy(nd_cmd.cmd.passphrase, key_data->data,
			sizeof(nd_cmd.cmd.passphrase));
	rc = nvdimm_ctl(nvdimm, ND_CMD_CALL, &nd_cmd, sizeof(nd_cmd), NULL);
	if (rc < 0)
		return rc;

	switch (nd_cmd.cmd.status) {
	case 0:
		break;
	case ND_INTEL_STATUS_INVALID_PASS:
		return -EINVAL;
	case ND_INTEL_STATUS_INVALID_STATE:
	default:
		return -ENXIO;
	}

	return 0;
}

/*
 * TODO: define a cross arch wbinvd equivalent when/if
 * NVDIMM_FAMILY_INTEL command support arrives on another arch.
 */
#ifdef CONFIG_X86
static void nvdimm_invalidate_cache(void)
{
	wbinvd_on_all_cpus();
}
#else
static void nvdimm_invalidate_cache(void)
{
	WARN_ON_ONCE("cache invalidation required after unlock\n");
}
#endif

static const struct nvdimm_security_ops __intel_security_ops = {
	.state = intel_security_state,
	.freeze = intel_security_freeze,
	.change_key = intel_security_change_key,
	.disable = intel_security_disable,
#ifdef CONFIG_X86
	.unlock = intel_security_unlock,
#endif
};

const struct nvdimm_security_ops *intel_security_ops = &__intel_security_ops;