1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  *  Copyright IBM Corp. 2001, 2018
4  *  Author(s): Robert Burroughs
5  *	       Eric Rossman (edrossma@us.ibm.com)
6  *
7  *  Hotplug & misc device support: Jochen Roehrig (roehrig@de.ibm.com)
8  *  Major cleanup & driver split: Martin Schwidefsky <schwidefsky@de.ibm.com>
9  *				  Ralph Wuerthner <rwuerthn@de.ibm.com>
10  *  MSGTYPE restruct:		  Holger Dengler <hd@linux.vnet.ibm.com>
11  */
12 
13 #include <linux/module.h>
14 #include <linux/init.h>
15 #include <linux/err.h>
16 #include <linux/delay.h>
17 #include <linux/slab.h>
18 #include <linux/atomic.h>
19 #include <linux/uaccess.h>
20 #include <linux/mod_devicetable.h>
21 
22 #include "ap_bus.h"
23 #include "zcrypt_api.h"
24 #include "zcrypt_error.h"
25 #include "zcrypt_msgtype6.h"
26 #include "zcrypt_cex2c.h"
27 #include "zcrypt_cca_key.h"
28 
29 #define CEX2C_MIN_MOD_SIZE	 16	/*  128 bits	*/
30 #define CEX2C_MAX_MOD_SIZE	256	/* 2048 bits	*/
31 #define CEX3C_MIN_MOD_SIZE	 16	/*  128 bits	*/
32 #define CEX3C_MAX_MOD_SIZE	512	/* 4096 bits	*/
33 #define CEX2C_MAX_XCRB_MESSAGE_SIZE (12*1024)
34 #define CEX2C_CLEANUP_TIME	(15*HZ)
35 
36 MODULE_AUTHOR("IBM Corporation");
37 MODULE_DESCRIPTION("CEX2C/CEX3C Cryptographic Coprocessor device driver, " \
38 		   "Copyright IBM Corp. 2001, 2018");
39 MODULE_LICENSE("GPL");
40 
41 static struct ap_device_id zcrypt_cex2c_card_ids[] = {
42 	{ .dev_type = AP_DEVICE_TYPE_CEX2C,
43 	  .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE },
44 	{ .dev_type = AP_DEVICE_TYPE_CEX3C,
45 	  .match_flags = AP_DEVICE_ID_MATCH_CARD_TYPE },
46 	{ /* end of list */ },
47 };
48 
49 MODULE_DEVICE_TABLE(ap, zcrypt_cex2c_card_ids);
50 
51 static struct ap_device_id zcrypt_cex2c_queue_ids[] = {
52 	{ .dev_type = AP_DEVICE_TYPE_CEX2C,
53 	  .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
54 	{ .dev_type = AP_DEVICE_TYPE_CEX3C,
55 	  .match_flags = AP_DEVICE_ID_MATCH_QUEUE_TYPE },
56 	{ /* end of list */ },
57 };
58 
59 MODULE_DEVICE_TABLE(ap, zcrypt_cex2c_queue_ids);
60 
61 /**
62  * Large random number detection function. Its sends a message to a CEX2C/CEX3C
63  * card to find out if large random numbers are supported.
64  * @ap_dev: pointer to the AP device.
65  *
66  * Returns 1 if large random numbers are supported, 0 if not and < 0 on error.
67  */
68 static int zcrypt_cex2c_rng_supported(struct ap_queue *aq)
69 {
70 	struct ap_message ap_msg;
71 	unsigned long long psmid;
72 	unsigned int domain;
73 	struct {
74 		struct type86_hdr hdr;
75 		struct type86_fmt2_ext fmt2;
76 		struct CPRBX cprbx;
77 	} __packed *reply;
78 	struct {
79 		struct type6_hdr hdr;
80 		struct CPRBX cprbx;
81 		char function_code[2];
82 		short int rule_length;
83 		char rule[8];
84 		short int verb_length;
85 		short int key_length;
86 	} __packed *msg;
87 	int rc, i;
88 
89 	ap_init_message(&ap_msg);
90 	ap_msg.message = (void *) get_zeroed_page(GFP_KERNEL);
91 	if (!ap_msg.message)
92 		return -ENOMEM;
93 
94 	rng_type6CPRB_msgX(&ap_msg, 4, &domain);
95 
96 	msg = ap_msg.message;
97 	msg->cprbx.domain = AP_QID_QUEUE(aq->qid);
98 
99 	rc = ap_send(aq->qid, 0x0102030405060708ULL, ap_msg.message,
100 		     ap_msg.length);
101 	if (rc)
102 		goto out_free;
103 
104 	/* Wait for the test message to complete. */
105 	for (i = 0; i < 2 * HZ; i++) {
106 		msleep(1000 / HZ);
107 		rc = ap_recv(aq->qid, &psmid, ap_msg.message, 4096);
108 		if (rc == 0 && psmid == 0x0102030405060708ULL)
109 			break;
110 	}
111 
112 	if (i >= 2 * HZ) {
113 		/* Got no answer. */
114 		rc = -ENODEV;
115 		goto out_free;
116 	}
117 
118 	reply = ap_msg.message;
119 	if (reply->cprbx.ccp_rtcode == 0 && reply->cprbx.ccp_rscode == 0)
120 		rc = 1;
121 	else
122 		rc = 0;
123 out_free:
124 	free_page((unsigned long) ap_msg.message);
125 	return rc;
126 }
127 
128 /**
129  * Probe function for CEX2C/CEX3C card devices. It always accepts the
130  * AP device since the bus_match already checked the hardware type.
131  * @ap_dev: pointer to the AP card device.
132  */
133 static int zcrypt_cex2c_card_probe(struct ap_device *ap_dev)
134 {
135 	/*
136 	 * Normalized speed ratings per crypto adapter
137 	 * MEX_1k, MEX_2k, MEX_4k, CRT_1k, CRT_2k, CRT_4k, RNG, SECKEY
138 	 */
139 	static const int CEX2C_SPEED_IDX[] = {
140 		1000, 1400, 2400, 1100, 1500, 2600, 100, 12};
141 	static const int CEX3C_SPEED_IDX[] = {
142 		500,  700, 1400,  550,	800, 1500,  80, 10};
143 
144 	struct ap_card *ac = to_ap_card(&ap_dev->device);
145 	struct zcrypt_card *zc;
146 	int rc = 0;
147 
148 	zc = zcrypt_card_alloc();
149 	if (!zc)
150 		return -ENOMEM;
151 	zc->card = ac;
152 	ac->private = zc;
153 	switch (ac->ap_dev.device_type) {
154 	case AP_DEVICE_TYPE_CEX2C:
155 		zc->user_space_type = ZCRYPT_CEX2C;
156 		zc->type_string = "CEX2C";
157 		memcpy(zc->speed_rating, CEX2C_SPEED_IDX,
158 		       sizeof(CEX2C_SPEED_IDX));
159 		zc->min_mod_size = CEX2C_MIN_MOD_SIZE;
160 		zc->max_mod_size = CEX2C_MAX_MOD_SIZE;
161 		zc->max_exp_bit_length = CEX2C_MAX_MOD_SIZE;
162 		break;
163 	case AP_DEVICE_TYPE_CEX3C:
164 		zc->user_space_type = ZCRYPT_CEX3C;
165 		zc->type_string = "CEX3C";
166 		memcpy(zc->speed_rating, CEX3C_SPEED_IDX,
167 		       sizeof(CEX3C_SPEED_IDX));
168 		zc->min_mod_size = CEX3C_MIN_MOD_SIZE;
169 		zc->max_mod_size = CEX3C_MAX_MOD_SIZE;
170 		zc->max_exp_bit_length = CEX3C_MAX_MOD_SIZE;
171 		break;
172 	default:
173 		zcrypt_card_free(zc);
174 		return -ENODEV;
175 	}
176 	zc->online = 1;
177 
178 	rc = zcrypt_card_register(zc);
179 	if (rc) {
180 		ac->private = NULL;
181 		zcrypt_card_free(zc);
182 	}
183 
184 	return rc;
185 }
186 
187 /**
188  * This is called to remove the CEX2C/CEX3C card driver information
189  * if an AP card device is removed.
190  */
191 static void zcrypt_cex2c_card_remove(struct ap_device *ap_dev)
192 {
193 	struct zcrypt_card *zc = to_ap_card(&ap_dev->device)->private;
194 
195 	if (zc)
196 		zcrypt_card_unregister(zc);
197 }
198 
199 static struct ap_driver zcrypt_cex2c_card_driver = {
200 	.probe = zcrypt_cex2c_card_probe,
201 	.remove = zcrypt_cex2c_card_remove,
202 	.ids = zcrypt_cex2c_card_ids,
203 	.flags = AP_DRIVER_FLAG_DEFAULT,
204 };
205 
206 /**
207  * Probe function for CEX2C/CEX3C queue devices. It always accepts the
208  * AP device since the bus_match already checked the hardware type.
209  * @ap_dev: pointer to the AP card device.
210  */
211 static int zcrypt_cex2c_queue_probe(struct ap_device *ap_dev)
212 {
213 	struct ap_queue *aq = to_ap_queue(&ap_dev->device);
214 	struct zcrypt_queue *zq;
215 	int rc;
216 
217 	zq = zcrypt_queue_alloc(CEX2C_MAX_XCRB_MESSAGE_SIZE);
218 	if (!zq)
219 		return -ENOMEM;
220 	zq->queue = aq;
221 	zq->online = 1;
222 	atomic_set(&zq->load, 0);
223 	rc = zcrypt_cex2c_rng_supported(aq);
224 	if (rc < 0) {
225 		zcrypt_queue_free(zq);
226 		return rc;
227 	}
228 	if (rc)
229 		zq->ops = zcrypt_msgtype(MSGTYPE06_NAME,
230 					 MSGTYPE06_VARIANT_DEFAULT);
231 	else
232 		zq->ops = zcrypt_msgtype(MSGTYPE06_NAME,
233 					 MSGTYPE06_VARIANT_NORNG);
234 	ap_queue_init_reply(aq, &zq->reply);
235 	aq->request_timeout = CEX2C_CLEANUP_TIME;
236 	aq->private = zq;
237 	rc = zcrypt_queue_register(zq);
238 	if (rc) {
239 		aq->private = NULL;
240 		zcrypt_queue_free(zq);
241 	}
242 	return rc;
243 }
244 
245 /**
246  * This is called to remove the CEX2C/CEX3C queue driver information
247  * if an AP queue device is removed.
248  */
249 static void zcrypt_cex2c_queue_remove(struct ap_device *ap_dev)
250 {
251 	struct ap_queue *aq = to_ap_queue(&ap_dev->device);
252 	struct zcrypt_queue *zq = aq->private;
253 
254 	if (zq)
255 		zcrypt_queue_unregister(zq);
256 }
257 
258 static struct ap_driver zcrypt_cex2c_queue_driver = {
259 	.probe = zcrypt_cex2c_queue_probe,
260 	.remove = zcrypt_cex2c_queue_remove,
261 	.suspend = ap_queue_suspend,
262 	.resume = ap_queue_resume,
263 	.ids = zcrypt_cex2c_queue_ids,
264 	.flags = AP_DRIVER_FLAG_DEFAULT,
265 };
266 
267 int __init zcrypt_cex2c_init(void)
268 {
269 	int rc;
270 
271 	rc = ap_driver_register(&zcrypt_cex2c_card_driver,
272 				THIS_MODULE, "cex2card");
273 	if (rc)
274 		return rc;
275 
276 	rc = ap_driver_register(&zcrypt_cex2c_queue_driver,
277 				THIS_MODULE, "cex2cqueue");
278 	if (rc)
279 		ap_driver_unregister(&zcrypt_cex2c_card_driver);
280 
281 	return rc;
282 }
283 
284 void zcrypt_cex2c_exit(void)
285 {
286 	ap_driver_unregister(&zcrypt_cex2c_queue_driver);
287 	ap_driver_unregister(&zcrypt_cex2c_card_driver);
288 }
289 
290 module_init(zcrypt_cex2c_init);
291 module_exit(zcrypt_cex2c_exit);
292