summaryrefslogtreecommitdiffstats
path: root/drivers/crypto/ccp/sp-dev.c
blob: b2879767fc983664deccaa0d68b0bc1dda844fc6 (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
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
/*
 * AMD Secure Processor driver
 *
 * Copyright (C) 2017-2018 Advanced Micro Devices, Inc.
 *
 * Author: Tom Lendacky <thomas.lendacky@amd.com>
 * Author: Gary R Hook <gary.hook@amd.com>
 * Author: Brijesh Singh <brijesh.singh@amd.com>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/spinlock.h>
#include <linux/spinlock_types.h>
#include <linux/types.h>
#include <linux/ccp.h>

#include "ccp-dev.h"
#include "sp-dev.h"

MODULE_AUTHOR("Tom Lendacky <thomas.lendacky@amd.com>");
MODULE_AUTHOR("Gary R Hook <gary.hook@amd.com>");
MODULE_LICENSE("GPL");
MODULE_VERSION("1.1.0");
MODULE_DESCRIPTION("AMD Secure Processor driver");

/* List of SPs, SP count, read-write access lock, and access functions
 *
 * Lock structure: get sp_unit_lock for reading whenever we need to
 * examine the SP list.
 */
static DEFINE_RWLOCK(sp_unit_lock);
static LIST_HEAD(sp_units);

/* Ever-increasing value to produce unique unit numbers */
static atomic_t sp_ordinal;

static void sp_add_device(struct sp_device *sp)
{
	unsigned long flags;

	write_lock_irqsave(&sp_unit_lock, flags);

	list_add_tail(&sp->entry, &sp_units);

	write_unlock_irqrestore(&sp_unit_lock, flags);
}

static void sp_del_device(struct sp_device *sp)
{
	unsigned long flags;

	write_lock_irqsave(&sp_unit_lock, flags);

	list_del(&sp->entry);

	write_unlock_irqrestore(&sp_unit_lock, flags);
}

static irqreturn_t sp_irq_handler(int irq, void *data)
{
	struct sp_device *sp = data;

	if (sp->ccp_irq_handler)
		sp->ccp_irq_handler(irq, sp->ccp_irq_data);

	if (sp->psp_irq_handler)
		sp->psp_irq_handler(irq, sp->psp_irq_data);

	return IRQ_HANDLED;
}

int sp_request_ccp_irq(struct sp_device *sp, irq_handler_t handler,
		       const char *name, void *data)
{
	int ret;

	if ((sp->psp_irq == sp->ccp_irq) && sp->dev_vdata->psp_vdata) {
		/* Need a common routine to manage all interrupts */
		sp->ccp_irq_data = data;
		sp->ccp_irq_handler = handler;

		if (!sp->irq_registered) {
			ret = request_irq(sp->ccp_irq, sp_irq_handler, 0,
					  sp->name, sp);
			if (ret)
				return ret;

			sp->irq_registered = true;
		}
	} else {
		/* Each sub-device can manage it's own interrupt */
		ret = request_irq(sp->ccp_irq, handler, 0, name, data);
		if (ret)
			return ret;
	}

	return 0;
}

int sp_request_psp_irq(struct sp_device *sp, irq_handler_t handler,
		       const char *name, void *data)
{
	int ret;

	if ((sp->psp_irq == sp->ccp_irq) && sp->dev_vdata->ccp_vdata) {
		/* Need a common routine to manage all interrupts */
		sp->psp_irq_data = data;
		sp->psp_irq_handler = handler;

		if (!sp->irq_registered) {
			ret = request_irq(sp->psp_irq, sp_irq_handler, 0,
					  sp->name, sp);
			if (ret)
				return ret;

			sp->irq_registered = true;
		}
	} else {
		/* Each sub-device can manage it's own interrupt */
		ret = request_irq(sp->psp_irq, handler, 0, name, data);
		if (ret)
			return ret;
	}

	return 0;
}

void sp_free_ccp_irq(struct sp_device *sp, void *data)
{
	if ((sp->psp_irq == sp->ccp_irq) && sp->dev_vdata->psp_vdata) {
		/* Using common routine to manage all interrupts */
		if (!sp->psp_irq_handler) {
			/* Nothing else using it, so free it */
			free_irq(sp->ccp_irq, sp);

			sp->irq_registered = false;
		}

		sp->ccp_irq_handler = NULL;
		sp->ccp_irq_data = NULL;
	} else {
		/* Each sub-device can manage it's own interrupt */
		free_irq(sp->ccp_irq, data);
	}
}

void sp_free_psp_irq(struct sp_device *sp, void *data)
{
	if ((sp->psp_irq == sp->ccp_irq) && sp->dev_vdata->ccp_vdata) {
		/* Using common routine to manage all interrupts */
		if (!sp->ccp_irq_handler) {
			/* Nothing else using it, so free it */
			free_irq(sp->psp_irq, sp);

			sp->irq_registered = false;
		}

		sp->psp_irq_handler = NULL;
		sp->psp_irq_data = NULL;
	} else {
		/* Each sub-device can manage it's own interrupt */
		free_irq(sp->psp_irq, data);
	}
}

/**
 * sp_alloc_struct - allocate and initialize the sp_device struct
 *
 * @dev: device struct of the SP
 */
struct sp_device *sp_alloc_struct(struct device *dev)
{
	struct sp_device *sp;

	sp = devm_kzalloc(dev, sizeof(*sp), GFP_KERNEL);
	if (!sp)
		return NULL;

	sp->dev = dev;
	sp->ord = atomic_inc_return(&sp_ordinal);
	snprintf(sp->name, SP_MAX_NAME_LEN, "sp-%u", sp->ord);

	return sp;
}

int sp_init(struct sp_device *sp)
{
	sp_add_device(sp);

	if (sp->dev_vdata->ccp_vdata)
		ccp_dev_init(sp);

	if (sp->dev_vdata->psp_vdata)
		psp_dev_init(sp);
	return 0;
}

void sp_destroy(struct sp_device *sp)
{
	if (sp->dev_vdata->ccp_vdata)
		ccp_dev_destroy(sp);

	if (sp->dev_vdata->psp_vdata)
		psp_dev_destroy(sp);

	sp_del_device(sp);
}

#ifdef CONFIG_PM
int sp_suspend(struct sp_device *sp, pm_message_t state)
{
	int ret;

	if (sp->dev_vdata->ccp_vdata) {
		ret = ccp_dev_suspend(sp, state);
		if (ret)
			return ret;
	}

	return 0;
}

int sp_resume(struct sp_device *sp)
{
	int ret;

	if (sp->dev_vdata->ccp_vdata) {
		ret = ccp_dev_resume(sp);
		if (ret)
			return ret;
	}

	return 0;
}
#endif

struct sp_device *sp_get_psp_master_device(void)
{
	struct sp_device *i, *ret = NULL;
	unsigned long flags;

	write_lock_irqsave(&sp_unit_lock, flags);
	if (list_empty(&sp_units))
		goto unlock;

	list_for_each_entry(i, &sp_units, entry) {
		if (i->psp_data && i->get_psp_master_device) {
			ret = i->get_psp_master_device();
			break;
		}
	}

unlock:
	write_unlock_irqrestore(&sp_unit_lock, flags);
	return ret;
}

static int __init sp_mod_init(void)
{
#ifdef CONFIG_X86
	int ret;

	ret = sp_pci_init();
	if (ret)
		return ret;

#ifdef CONFIG_CRYPTO_DEV_SP_PSP
	psp_pci_init();
#endif

	return 0;
#endif

#ifdef CONFIG_ARM64
	int ret;

	ret = sp_platform_init();
	if (ret)
		return ret;

	return 0;
#endif

	return -ENODEV;
}

static void __exit sp_mod_exit(void)
{
#ifdef CONFIG_X86

#ifdef CONFIG_CRYPTO_DEV_SP_PSP
	psp_pci_exit();
#endif

	sp_pci_exit();
#endif

#ifdef CONFIG_ARM64
	sp_platform_exit();
#endif
}

module_init(sp_mod_init);
module_exit(sp_mod_exit);