1 /* SPDX-License-Identifier: GPL-2.0+ */
2 /*
3  * Copyright IBM Corp. 2006, 2023
4  * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com>
5  *	      Martin Schwidefsky <schwidefsky@de.ibm.com>
6  *	      Ralph Wuerthner <rwuerthn@de.ibm.com>
7  *	      Felix Beck <felix.beck@de.ibm.com>
8  *	      Holger Dengler <hd@linux.vnet.ibm.com>
9  *
10  * Adjunct processor bus header file.
11  */
12 
13 #ifndef _AP_BUS_H_
14 #define _AP_BUS_H_
15 
16 #include <linux/device.h>
17 #include <linux/types.h>
18 #include <linux/hashtable.h>
19 #include <asm/isc.h>
20 #include <asm/ap.h>
21 
22 #define AP_DEVICES 256		/* Number of AP devices. */
23 #define AP_DOMAINS 256		/* Number of AP domains. */
24 #define AP_IOCTLS  256		/* Number of ioctls. */
25 #define AP_RESET_TIMEOUT (HZ*0.7)	/* Time in ticks for reset timeouts. */
26 #define AP_CONFIG_TIME 30	/* Time in seconds between AP bus rescans. */
27 #define AP_POLL_TIME 1		/* Time in ticks between receive polls. */
28 #define AP_DEFAULT_MAX_MSG_SIZE (12 * 1024)
29 #define AP_TAPQ_ML_FIELD_CHUNK_SIZE (4096)
30 
31 extern int ap_domain_index;
32 extern atomic_t ap_max_msg_size;
33 
34 extern DECLARE_HASHTABLE(ap_queues, 8);
35 extern spinlock_t ap_queues_lock;
36 
ap_test_bit(unsigned int * ptr,unsigned int nr)37 static inline int ap_test_bit(unsigned int *ptr, unsigned int nr)
38 {
39 	return (*ptr & (0x80000000u >> nr)) != 0;
40 }
41 
42 #define AP_RESPONSE_NORMAL		     0x00
43 #define AP_RESPONSE_Q_NOT_AVAIL		     0x01
44 #define AP_RESPONSE_RESET_IN_PROGRESS	     0x02
45 #define AP_RESPONSE_DECONFIGURED	     0x03
46 #define AP_RESPONSE_CHECKSTOPPED	     0x04
47 #define AP_RESPONSE_BUSY		     0x05
48 #define AP_RESPONSE_INVALID_ADDRESS	     0x06
49 #define AP_RESPONSE_OTHERWISE_CHANGED	     0x07
50 #define AP_RESPONSE_INVALID_GISA	     0x08
51 #define AP_RESPONSE_Q_BOUND_TO_ANOTHER	     0x09
52 #define AP_RESPONSE_STATE_CHANGE_IN_PROGRESS 0x0A
53 #define AP_RESPONSE_Q_NOT_BOUND		     0x0B
54 #define AP_RESPONSE_Q_FULL		     0x10
55 #define AP_RESPONSE_NO_PENDING_REPLY	     0x10
56 #define AP_RESPONSE_INDEX_TOO_BIG	     0x11
57 #define AP_RESPONSE_NO_FIRST_PART	     0x13
58 #define AP_RESPONSE_MESSAGE_TOO_BIG	     0x15
59 #define AP_RESPONSE_REQ_FAC_NOT_INST	     0x16
60 #define AP_RESPONSE_Q_BIND_ERROR	     0x30
61 #define AP_RESPONSE_Q_NOT_AVAIL_FOR_ASSOC    0x31
62 #define AP_RESPONSE_Q_NOT_EMPTY		     0x32
63 #define AP_RESPONSE_BIND_LIMIT_EXCEEDED	     0x33
64 #define AP_RESPONSE_INVALID_ASSOC_SECRET     0x34
65 #define AP_RESPONSE_ASSOC_SECRET_NOT_UNIQUE  0x35
66 #define AP_RESPONSE_ASSOC_FAILED	     0x36
67 #define AP_RESPONSE_INVALID_DOMAIN	     0x42
68 
69 /*
70  * Supported AP device types
71  */
72 #define AP_DEVICE_TYPE_CEX4	10
73 #define AP_DEVICE_TYPE_CEX5	11
74 #define AP_DEVICE_TYPE_CEX6	12
75 #define AP_DEVICE_TYPE_CEX7	13
76 #define AP_DEVICE_TYPE_CEX8	14
77 
78 /*
79  * Known function facilities
80  */
81 #define AP_FUNC_MEX4K 1
82 #define AP_FUNC_CRT4K 2
83 #define AP_FUNC_COPRO 3
84 #define AP_FUNC_ACCEL 4
85 #define AP_FUNC_EP11  5
86 #define AP_FUNC_APXA  6
87 
88 /*
89  * AP queue state machine states
90  */
91 enum ap_sm_state {
92 	AP_SM_STATE_RESET_START = 0,
93 	AP_SM_STATE_RESET_WAIT,
94 	AP_SM_STATE_SETIRQ_WAIT,
95 	AP_SM_STATE_IDLE,
96 	AP_SM_STATE_WORKING,
97 	AP_SM_STATE_QUEUE_FULL,
98 	AP_SM_STATE_ASSOC_WAIT,
99 	NR_AP_SM_STATES
100 };
101 
102 /*
103  * AP queue state machine events
104  */
105 enum ap_sm_event {
106 	AP_SM_EVENT_POLL,
107 	AP_SM_EVENT_TIMEOUT,
108 	NR_AP_SM_EVENTS
109 };
110 
111 /*
112  * AP queue state wait behaviour
113  */
114 enum ap_sm_wait {
115 	AP_SM_WAIT_AGAIN = 0,	 /* retry immediately */
116 	AP_SM_WAIT_HIGH_TIMEOUT, /* poll high freq, wait for timeout */
117 	AP_SM_WAIT_LOW_TIMEOUT,	 /* poll low freq, wait for timeout */
118 	AP_SM_WAIT_INTERRUPT,	 /* wait for thin interrupt (if available) */
119 	AP_SM_WAIT_NONE,	 /* no wait */
120 	NR_AP_SM_WAIT
121 };
122 
123 /*
124  * AP queue device states
125  */
126 enum ap_dev_state {
127 	AP_DEV_STATE_UNINITIATED = 0,	/* fresh and virgin, not touched */
128 	AP_DEV_STATE_OPERATING,		/* queue dev is working normal */
129 	AP_DEV_STATE_SHUTDOWN,		/* remove/unbind/shutdown in progress */
130 	AP_DEV_STATE_ERROR,		/* device is in error state */
131 	NR_AP_DEV_STATES
132 };
133 
134 struct ap_device;
135 struct ap_message;
136 
137 /*
138  * The ap driver struct includes a flags field which holds some info for
139  * the ap bus about the driver. Currently only one flag is supported and
140  * used: The DEFAULT flag marks an ap driver as a default driver which is
141  * used together with the apmask and aqmask whitelisting of the ap bus.
142  */
143 #define AP_DRIVER_FLAG_DEFAULT 0x0001
144 
145 struct ap_driver {
146 	struct device_driver driver;
147 	struct ap_device_id *ids;
148 	unsigned int flags;
149 
150 	int (*probe)(struct ap_device *);
151 	void (*remove)(struct ap_device *);
152 	int (*in_use)(unsigned long *apm, unsigned long *aqm);
153 	/*
154 	 * Called at the start of the ap bus scan function when
155 	 * the crypto config information (qci) has changed.
156 	 * This callback is not invoked if there is no AP
157 	 * QCI support available.
158 	 */
159 	void (*on_config_changed)(struct ap_config_info *new_config_info,
160 				  struct ap_config_info *old_config_info);
161 	/*
162 	 * Called at the end of the ap bus scan function when
163 	 * the crypto config information (qci) has changed.
164 	 * This callback is not invoked if there is no AP
165 	 * QCI support available.
166 	 */
167 	void (*on_scan_complete)(struct ap_config_info *new_config_info,
168 				 struct ap_config_info *old_config_info);
169 };
170 
171 #define to_ap_drv(x) container_of((x), struct ap_driver, driver)
172 
173 int ap_driver_register(struct ap_driver *, struct module *, char *);
174 void ap_driver_unregister(struct ap_driver *);
175 
176 struct ap_device {
177 	struct device device;
178 	int device_type;		/* AP device type. */
179 };
180 
181 #define to_ap_dev(x) container_of((x), struct ap_device, device)
182 
183 struct ap_card {
184 	struct ap_device ap_dev;
185 	int raw_hwtype;			/* AP raw hardware type. */
186 	unsigned int functions;		/* TAPQ GR2 upper 32 facility bits */
187 	int queue_depth;		/* AP queue depth.*/
188 	int id;				/* AP card number. */
189 	unsigned int maxmsgsize;	/* AP msg limit for this card */
190 	bool config;			/* configured state */
191 	bool chkstop;			/* checkstop state */
192 	atomic64_t total_request_count;	/* # requests ever for this AP device.*/
193 };
194 
195 #define TAPQ_CARD_FUNC_CMP_MASK 0xFFFF0000
196 #define ASSOC_IDX_INVALID 0x10000
197 
198 #define to_ap_card(x) container_of((x), struct ap_card, ap_dev.device)
199 
200 struct ap_queue {
201 	struct ap_device ap_dev;
202 	struct hlist_node hnode;	/* Node for the ap_queues hashtable */
203 	struct ap_card *card;		/* Ptr to assoc. AP card. */
204 	spinlock_t lock;		/* Per device lock. */
205 	enum ap_dev_state dev_state;	/* queue device state */
206 	bool config;			/* configured state */
207 	bool chkstop;			/* checkstop state */
208 	ap_qid_t qid;			/* AP queue id. */
209 	bool interrupt;			/* indicate if interrupts are enabled */
210 	unsigned int assoc_idx;		/* SE association index */
211 	int queue_count;		/* # messages currently on AP queue. */
212 	int pendingq_count;		/* # requests on pendingq list. */
213 	int requestq_count;		/* # requests on requestq list. */
214 	u64 total_request_count;	/* # requests ever for this AP device.*/
215 	int request_timeout;		/* Request timeout in jiffies. */
216 	struct timer_list timeout;	/* Timer for request timeouts. */
217 	struct list_head pendingq;	/* List of message sent to AP queue. */
218 	struct list_head requestq;	/* List of message yet to be sent. */
219 	struct ap_message *reply;	/* Per device reply message. */
220 	enum ap_sm_state sm_state;	/* ap queue state machine state */
221 	int rapq_fbit;			/* fbit arg for next rapq invocation */
222 	int last_err_rc;		/* last error state response code */
223 };
224 
225 #define to_ap_queue(x) container_of((x), struct ap_queue, ap_dev.device)
226 
227 typedef enum ap_sm_wait (ap_func_t)(struct ap_queue *queue);
228 
229 struct ap_message {
230 	struct list_head list;		/* Request queueing. */
231 	unsigned long psmid;		/* Message id. */
232 	void *msg;			/* Pointer to message buffer. */
233 	size_t len;			/* actual msg len in msg buffer */
234 	size_t bufsize;			/* allocated msg buffer size */
235 	u16 flags;			/* Flags, see AP_MSG_FLAG_xxx */
236 	int rc;				/* Return code for this message */
237 	void *private;			/* ap driver private pointer. */
238 	/* receive is called from tasklet context */
239 	void (*receive)(struct ap_queue *, struct ap_message *,
240 			struct ap_message *);
241 };
242 
243 #define AP_MSG_FLAG_SPECIAL  0x0001	/* flag msg as 'special' with NQAP */
244 #define AP_MSG_FLAG_USAGE    0x0002	/* CCA, EP11: usage (no admin) msg */
245 #define AP_MSG_FLAG_ADMIN    0x0004	/* CCA, EP11: admin (=control) msg */
246 
247 /**
248  * ap_init_message() - Initialize ap_message.
249  * Initialize a message before using. Otherwise this might result in
250  * unexpected behaviour.
251  */
ap_init_message(struct ap_message * ap_msg)252 static inline void ap_init_message(struct ap_message *ap_msg)
253 {
254 	memset(ap_msg, 0, sizeof(*ap_msg));
255 }
256 
257 /**
258  * ap_release_message() - Release ap_message.
259  * Releases all memory used internal within the ap_message struct
260  * Currently this is the message and private field.
261  */
ap_release_message(struct ap_message * ap_msg)262 static inline void ap_release_message(struct ap_message *ap_msg)
263 {
264 	kfree_sensitive(ap_msg->msg);
265 	kfree_sensitive(ap_msg->private);
266 }
267 
268 enum ap_sm_wait ap_sm_event(struct ap_queue *aq, enum ap_sm_event event);
269 enum ap_sm_wait ap_sm_event_loop(struct ap_queue *aq, enum ap_sm_event event);
270 
271 int ap_queue_message(struct ap_queue *aq, struct ap_message *ap_msg);
272 void ap_cancel_message(struct ap_queue *aq, struct ap_message *ap_msg);
273 void ap_flush_queue(struct ap_queue *aq);
274 
275 void *ap_airq_ptr(void);
276 int ap_sb_available(void);
277 bool ap_is_se_guest(void);
278 void ap_wait(enum ap_sm_wait wait);
279 void ap_request_timeout(struct timer_list *t);
280 void ap_bus_force_rescan(void);
281 
282 int ap_test_config_usage_domain(unsigned int domain);
283 int ap_test_config_ctrl_domain(unsigned int domain);
284 
285 void ap_queue_init_reply(struct ap_queue *aq, struct ap_message *ap_msg);
286 struct ap_queue *ap_queue_create(ap_qid_t qid, int device_type);
287 void ap_queue_prepare_remove(struct ap_queue *aq);
288 void ap_queue_remove(struct ap_queue *aq);
289 void ap_queue_init_state(struct ap_queue *aq);
290 void _ap_queue_init_state(struct ap_queue *aq);
291 
292 struct ap_card *ap_card_create(int id, int queue_depth, int raw_type,
293 			       int comp_type, unsigned int functions, int ml);
294 
295 #define APMASKSIZE (BITS_TO_LONGS(AP_DEVICES) * sizeof(unsigned long))
296 #define AQMASKSIZE (BITS_TO_LONGS(AP_DOMAINS) * sizeof(unsigned long))
297 
298 struct ap_perms {
299 	unsigned long ioctlm[BITS_TO_LONGS(AP_IOCTLS)];
300 	unsigned long apm[BITS_TO_LONGS(AP_DEVICES)];
301 	unsigned long aqm[BITS_TO_LONGS(AP_DOMAINS)];
302 	unsigned long adm[BITS_TO_LONGS(AP_DOMAINS)];
303 };
304 
305 extern struct ap_perms ap_perms;
306 extern struct mutex ap_perms_mutex;
307 
308 /*
309  * Get ap_queue device for this qid.
310  * Returns ptr to the struct ap_queue device or NULL if there
311  * was no ap_queue device with this qid found. When something is
312  * found, the reference count of the embedded device is increased.
313  * So the caller has to decrease the reference count after use
314  * with a call to put_device(&aq->ap_dev.device).
315  */
316 struct ap_queue *ap_get_qdev(ap_qid_t qid);
317 
318 /*
319  * check APQN for owned/reserved by ap bus and default driver(s).
320  * Checks if this APQN is or will be in use by the ap bus
321  * and the default set of drivers.
322  * If yes, returns 1, if not returns 0. On error a negative
323  * errno value is returned.
324  */
325 int ap_owned_by_def_drv(int card, int queue);
326 
327 /*
328  * check 'matrix' of APQNs for owned/reserved by ap bus and
329  * default driver(s).
330  * Checks if there is at least one APQN in the given 'matrix'
331  * marked as owned/reserved by the ap bus and default driver(s).
332  * If such an APQN is found the return value is 1, otherwise
333  * 0 is returned. On error a negative errno value is returned.
334  * The parameter apm is a bitmask which should be declared
335  * as DECLARE_BITMAP(apm, AP_DEVICES), the aqm parameter is
336  * similar, should be declared as DECLARE_BITMAP(aqm, AP_DOMAINS).
337  */
338 int ap_apqn_in_matrix_owned_by_def_drv(unsigned long *apm,
339 				       unsigned long *aqm);
340 
341 /*
342  * ap_parse_mask_str() - helper function to parse a bitmap string
343  * and clear/set the bits in the bitmap accordingly. The string may be
344  * given as absolute value, a hex string like 0x1F2E3D4C5B6A" simple
345  * overwriting the current content of the bitmap. Or as relative string
346  * like "+1-16,-32,-0x40,+128" where only single bits or ranges of
347  * bits are cleared or set. Distinction is done based on the very
348  * first character which may be '+' or '-' for the relative string
349  * and otherwise assume to be an absolute value string. If parsing fails
350  * a negative errno value is returned. All arguments and bitmaps are
351  * big endian order.
352  */
353 int ap_parse_mask_str(const char *str,
354 		      unsigned long *bitmap, int bits,
355 		      struct mutex *lock);
356 
357 /*
358  * Interface to wait for the AP bus to have done one initial ap bus
359  * scan and all detected APQNs have been bound to device drivers.
360  * If these both conditions are not fulfilled, this function blocks
361  * on a condition with wait_for_completion_killable_timeout().
362  * If these both conditions are fulfilled (before the timeout hits)
363  * the return value is 0. If the timeout (in jiffies) hits instead
364  * -ETIME is returned. On failures negative return values are
365  * returned to the caller.
366  */
367 int ap_wait_init_apqn_bindings_complete(unsigned long timeout);
368 
369 void ap_send_config_uevent(struct ap_device *ap_dev, bool cfg);
370 void ap_send_online_uevent(struct ap_device *ap_dev, int online);
371 
372 #endif /* _AP_BUS_H_ */
373