summaryrefslogtreecommitdiff
path: root/drivers/s390/crypto/ap_bus.h
blob: 472efd3a755c4b139f42de39ea61bd4190872a3f (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
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
/* SPDX-License-Identifier: GPL-2.0+ */
/*
 * Copyright IBM Corp. 2006, 2019
 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
 *	      Martin Schwidefsky <schwidefsky@de.ibm.com>
 *	      Ralph Wuerthner <rwuerthn@de.ibm.com>
 *	      Felix Beck <felix.beck@de.ibm.com>
 *	      Holger Dengler <hd@linux.vnet.ibm.com>
 *
 * Adjunct processor bus header file.
 */

#ifndef _AP_BUS_H_
#define _AP_BUS_H_

#include <linux/device.h>
#include <linux/types.h>
#include <linux/hashtable.h>
#include <asm/isc.h>
#include <asm/ap.h>

#define AP_DEVICES 256		/* Number of AP devices. */
#define AP_DOMAINS 256		/* Number of AP domains. */
#define AP_IOCTLS  256		/* Number of ioctls. */
#define AP_RESET_TIMEOUT (HZ*0.7)	/* Time in ticks for reset timeouts. */
#define AP_CONFIG_TIME 30	/* Time in seconds between AP bus rescans. */
#define AP_POLL_TIME 1		/* Time in ticks between receive polls. */

extern int ap_domain_index;

extern DECLARE_HASHTABLE(ap_queues, 8);
extern spinlock_t ap_queues_lock;

static inline int ap_test_bit(unsigned int *ptr, unsigned int nr)
{
	return (*ptr & (0x80000000u >> nr)) != 0;
}

#define AP_RESPONSE_NORMAL		0x00
#define AP_RESPONSE_Q_NOT_AVAIL		0x01
#define AP_RESPONSE_RESET_IN_PROGRESS	0x02
#define AP_RESPONSE_DECONFIGURED	0x03
#define AP_RESPONSE_CHECKSTOPPED	0x04
#define AP_RESPONSE_BUSY		0x05
#define AP_RESPONSE_INVALID_ADDRESS	0x06
#define AP_RESPONSE_OTHERWISE_CHANGED	0x07
#define AP_RESPONSE_Q_FULL		0x10
#define AP_RESPONSE_NO_PENDING_REPLY	0x10
#define AP_RESPONSE_INDEX_TOO_BIG	0x11
#define AP_RESPONSE_NO_FIRST_PART	0x13
#define AP_RESPONSE_MESSAGE_TOO_BIG	0x15
#define AP_RESPONSE_REQ_FAC_NOT_INST	0x16
#define AP_RESPONSE_INVALID_DOMAIN	0x42

/*
 * Known device types
 */
#define AP_DEVICE_TYPE_PCICC	3
#define AP_DEVICE_TYPE_PCICA	4
#define AP_DEVICE_TYPE_PCIXCC	5
#define AP_DEVICE_TYPE_CEX2A	6
#define AP_DEVICE_TYPE_CEX2C	7
#define AP_DEVICE_TYPE_CEX3A	8
#define AP_DEVICE_TYPE_CEX3C	9
#define AP_DEVICE_TYPE_CEX4	10
#define AP_DEVICE_TYPE_CEX5	11
#define AP_DEVICE_TYPE_CEX6	12
#define AP_DEVICE_TYPE_CEX7	13

/*
 * Known function facilities
 */
#define AP_FUNC_MEX4K 1
#define AP_FUNC_CRT4K 2
#define AP_FUNC_COPRO 3
#define AP_FUNC_ACCEL 4
#define AP_FUNC_EP11  5
#define AP_FUNC_APXA  6

/*
 * AP interrupt states
 */
#define AP_INTR_DISABLED	0	/* AP interrupt disabled */
#define AP_INTR_ENABLED		1	/* AP interrupt enabled */

/*
 * AP queue state machine states
 */
enum ap_sm_state {
	AP_SM_STATE_RESET_START = 0,
	AP_SM_STATE_RESET_WAIT,
	AP_SM_STATE_SETIRQ_WAIT,
	AP_SM_STATE_IDLE,
	AP_SM_STATE_WORKING,
	AP_SM_STATE_QUEUE_FULL,
	NR_AP_SM_STATES
};

/*
 * AP queue state machine events
 */
enum ap_sm_event {
	AP_SM_EVENT_POLL,
	AP_SM_EVENT_TIMEOUT,
	NR_AP_SM_EVENTS
};

/*
 * AP queue state wait behaviour
 */
enum ap_sm_wait {
	AP_SM_WAIT_AGAIN,	/* retry immediately */
	AP_SM_WAIT_TIMEOUT,	/* wait for timeout */
	AP_SM_WAIT_INTERRUPT,	/* wait for thin interrupt (if available) */
	AP_SM_WAIT_NONE,	/* no wait */
	NR_AP_SM_WAIT
};

/*
 * AP queue device states
 */
enum ap_dev_state {
	AP_DEV_STATE_UNINITIATED = 0,	/* fresh and virgin, not touched */
	AP_DEV_STATE_OPERATING,		/* queue dev is working normal */
	AP_DEV_STATE_SHUTDOWN,		/* remove/unbind/shutdown in progress */
	AP_DEV_STATE_ERROR,		/* device is in error state */
	NR_AP_DEV_STATES
};

struct ap_device;
struct ap_message;

/*
 * The ap driver struct includes a flags field which holds some info for
 * the ap bus about the driver. Currently only one flag is supported and
 * used: The DEFAULT flag marks an ap driver as a default driver which is
 * used together with the apmask and aqmask whitelisting of the ap bus.
 */
#define AP_DRIVER_FLAG_DEFAULT 0x0001

struct ap_driver {
	struct device_driver driver;
	struct ap_device_id *ids;
	unsigned int flags;

	int (*probe)(struct ap_device *);
	void (*remove)(struct ap_device *);
};

#define to_ap_drv(x) container_of((x), struct ap_driver, driver)

int ap_driver_register(struct ap_driver *, struct module *, char *);
void ap_driver_unregister(struct ap_driver *);

struct ap_device {
	struct device device;
	struct ap_driver *drv;		/* Pointer to AP device driver. */
	int device_type;		/* AP device type. */
};

#define to_ap_dev(x) container_of((x), struct ap_device, device)

struct ap_card {
	struct ap_device ap_dev;
	void *private;			/* ap driver private pointer. */
	int raw_hwtype;			/* AP raw hardware type. */
	unsigned int functions;		/* AP device function bitfield. */
	int queue_depth;		/* AP queue depth.*/
	int id;				/* AP card number. */
	bool config;			/* configured state */
	atomic64_t total_request_count;	/* # requests ever for this AP device.*/
};

#define to_ap_card(x) container_of((x), struct ap_card, ap_dev.device)

struct ap_queue {
	struct ap_device ap_dev;
	struct hlist_node hnode;	/* Node for the ap_queues hashtable */
	struct ap_card *card;		/* Ptr to assoc. AP card. */
	spinlock_t lock;		/* Per device lock. */
	void *private;			/* ap driver private pointer. */
	enum ap_dev_state dev_state;	/* queue device state */
	bool config;			/* configured state */
	ap_qid_t qid;			/* AP queue id. */
	int interrupt;			/* indicate if interrupts are enabled */
	int queue_count;		/* # messages currently on AP queue. */
	int pendingq_count;		/* # requests on pendingq list. */
	int requestq_count;		/* # requests on requestq list. */
	u64 total_request_count;	/* # requests ever for this AP device.*/
	int request_timeout;		/* Request timeout in jiffies. */
	struct timer_list timeout;	/* Timer for request timeouts. */
	struct list_head pendingq;	/* List of message sent to AP queue. */
	struct list_head requestq;	/* List of message yet to be sent. */
	struct ap_message *reply;	/* Per device reply message. */
	enum ap_sm_state sm_state;	/* ap queue state machine state */
	int last_err_rc;		/* last error state response code */
};

#define to_ap_queue(x) container_of((x), struct ap_queue, ap_dev.device)

typedef enum ap_sm_wait (ap_func_t)(struct ap_queue *queue);

/* failure injection cmd struct */
struct ap_fi {
	union {
		u16 cmd;		/* fi flags + action */
		struct {
			u8 flags;	/* fi flags only */
			u8 action;	/* fi action only */
		};
	};
};

/* all currently known fi actions */
enum ap_fi_actions {
	AP_FI_ACTION_CCA_AGENT_FF   = 0x01,
	AP_FI_ACTION_CCA_DOM_INVAL  = 0x02,
	AP_FI_ACTION_NQAP_QID_INVAL = 0x03,
};

/* all currently known fi flags */
enum ap_fi_flags {
	AP_FI_FLAG_NO_RETRY	  = 0x01,
	AP_FI_FLAG_TOGGLE_SPECIAL = 0x02,
};

struct ap_message {
	struct list_head list;		/* Request queueing. */
	unsigned long long psmid;	/* Message id. */
	void *msg;			/* Pointer to message buffer. */
	unsigned int len;		/* Message length. */
	u16 flags;			/* Flags, see AP_MSG_FLAG_xxx */
	struct ap_fi fi;		/* Failure Injection cmd */
	int rc;				/* Return code for this message */
	void *private;			/* ap driver private pointer. */
	/* receive is called from tasklet context */
	void (*receive)(struct ap_queue *, struct ap_message *,
			struct ap_message *);
};

#define AP_MSG_FLAG_SPECIAL  1		/* flag msg as 'special' with NQAP */

/**
 * ap_init_message() - Initialize ap_message.
 * Initialize a message before using. Otherwise this might result in
 * unexpected behaviour.
 */
static inline void ap_init_message(struct ap_message *ap_msg)
{
	memset(ap_msg, 0, sizeof(*ap_msg));
}

/**
 * ap_release_message() - Release ap_message.
 * Releases all memory used internal within the ap_message struct
 * Currently this is the message and private field.
 */
static inline void ap_release_message(struct ap_message *ap_msg)
{
	kfree_sensitive(ap_msg->msg);
	kfree_sensitive(ap_msg->private);
}

/*
 * Note: don't use ap_send/ap_recv after using ap_queue_message
 * for the first time. Otherwise the ap message queue will get
 * confused.
 */
int ap_send(ap_qid_t, unsigned long long, void *, size_t);
int ap_recv(ap_qid_t, unsigned long long *, void *, size_t);

enum ap_sm_wait ap_sm_event(struct ap_queue *aq, enum ap_sm_event event);
enum ap_sm_wait ap_sm_event_loop(struct ap_queue *aq, enum ap_sm_event event);

int ap_queue_message(struct ap_queue *aq, struct ap_message *ap_msg);
void ap_cancel_message(struct ap_queue *aq, struct ap_message *ap_msg);
void ap_flush_queue(struct ap_queue *aq);

void *ap_airq_ptr(void);
void ap_wait(enum ap_sm_wait wait);
void ap_request_timeout(struct timer_list *t);
void ap_bus_force_rescan(void);

int ap_test_config_usage_domain(unsigned int domain);
int ap_test_config_ctrl_domain(unsigned int domain);

void ap_queue_init_reply(struct ap_queue *aq, struct ap_message *ap_msg);
struct ap_queue *ap_queue_create(ap_qid_t qid, int device_type);
void ap_queue_prepare_remove(struct ap_queue *aq);
void ap_queue_remove(struct ap_queue *aq);
void ap_queue_init_state(struct ap_queue *aq);

struct ap_card *ap_card_create(int id, int queue_depth, int raw_device_type,
			       int comp_device_type, unsigned int functions);

struct ap_perms {
	unsigned long ioctlm[BITS_TO_LONGS(AP_IOCTLS)];
	unsigned long apm[BITS_TO_LONGS(AP_DEVICES)];
	unsigned long aqm[BITS_TO_LONGS(AP_DOMAINS)];
};
extern struct ap_perms ap_perms;
extern struct mutex ap_perms_mutex;

/*
 * Get ap_queue device for this qid.
 * Returns ptr to the struct ap_queue device or NULL if there
 * was no ap_queue device with this qid found. When something is
 * found, the reference count of the embedded device is increased.
 * So the caller has to decrease the reference count after use
 * with a call to put_device(&aq->ap_dev.device).
 */
struct ap_queue *ap_get_qdev(ap_qid_t qid);

/*
 * check APQN for owned/reserved by ap bus and default driver(s).
 * Checks if this APQN is or will be in use by the ap bus
 * and the default set of drivers.
 * If yes, returns 1, if not returns 0. On error a negative
 * errno value is returned.
 */
int ap_owned_by_def_drv(int card, int queue);

/*
 * check 'matrix' of APQNs for owned/reserved by ap bus and
 * default driver(s).
 * Checks if there is at least one APQN in the given 'matrix'
 * marked as owned/reserved by the ap bus and default driver(s).
 * If such an APQN is found the return value is 1, otherwise
 * 0 is returned. On error a negative errno value is returned.
 * The parameter apm is a bitmask which should be declared
 * as DECLARE_BITMAP(apm, AP_DEVICES), the aqm parameter is
 * similar, should be declared as DECLARE_BITMAP(aqm, AP_DOMAINS).
 */
int ap_apqn_in_matrix_owned_by_def_drv(unsigned long *apm,
				       unsigned long *aqm);

/*
 * ap_parse_mask_str() - helper function to parse a bitmap string
 * and clear/set the bits in the bitmap accordingly. The string may be
 * given as absolute value, a hex string like 0x1F2E3D4C5B6A" simple
 * overwriting the current content of the bitmap. Or as relative string
 * like "+1-16,-32,-0x40,+128" where only single bits or ranges of
 * bits are cleared or set. Distinction is done based on the very
 * first character which may be '+' or '-' for the relative string
 * and othewise assume to be an absolute value string. If parsing fails
 * a negative errno value is returned. All arguments and bitmaps are
 * big endian order.
 */
int ap_parse_mask_str(const char *str,
		      unsigned long *bitmap, int bits,
		      struct mutex *lock);

/*
 * Interface to wait for the AP bus to have done one initial ap bus
 * scan and all detected APQNs have been bound to device drivers.
 * If these both conditions are not fulfilled, this function blocks
 * on a condition with wait_for_completion_killable_timeout().
 * If these both conditions are fulfilled (before the timeout hits)
 * the return value is 0. If the timeout (in jiffies) hits instead
 * -ETIME is returned. On failures negative return values are
 * returned to the caller.
 */
int ap_wait_init_apqn_bindings_complete(unsigned long timeout);

#endif /* _AP_BUS_H_ */