drivers/s390/crypto/ap_bus.h

   1 // SPDX-License-Identifier: GPL-2.0+
   2 /*
   3  * Copyright IBM Corp. 2006, 2012
   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 <asm/ap.h>
  19
  20 #define AP_DEVICES 64           /* Number of AP devices. */
  21 #define AP_DOMAINS 256          /* Number of AP domains. */
  22 #define AP_RESET_TIMEOUT (HZ*0.7)       /* Time in ticks for reset timeouts. */
  23 #define AP_CONFIG_TIME 30       /* Time in seconds between AP bus rescans. */
  24 #define AP_POLL_TIME 1          /* Time in ticks between receive polls. */
  25
  26 extern int ap_domain_index;
  27
  28 extern spinlock_t ap_list_lock;
  29 extern struct list_head ap_card_list;
  30
  31 static inline int ap_test_bit(unsigned int *ptr, unsigned int nr)
  32 {
  33         return (*ptr & (0x80000000u >> nr)) != 0;
  34 }
  35
  36 #define AP_RESPONSE_NORMAL              0x00
  37 #define AP_RESPONSE_Q_NOT_AVAIL         0x01
  38 #define AP_RESPONSE_RESET_IN_PROGRESS   0x02
  39 #define AP_RESPONSE_DECONFIGURED        0x03
  40 #define AP_RESPONSE_CHECKSTOPPED        0x04
  41 #define AP_RESPONSE_BUSY                0x05
  42 #define AP_RESPONSE_INVALID_ADDRESS     0x06
  43 #define AP_RESPONSE_OTHERWISE_CHANGED   0x07
  44 #define AP_RESPONSE_Q_FULL              0x10
  45 #define AP_RESPONSE_NO_PENDING_REPLY    0x10
  46 #define AP_RESPONSE_INDEX_TOO_BIG       0x11
  47 #define AP_RESPONSE_NO_FIRST_PART       0x13
  48 #define AP_RESPONSE_MESSAGE_TOO_BIG     0x15
  49 #define AP_RESPONSE_REQ_FAC_NOT_INST    0x16
  50
  51 /*
  52  * Known device types
  53  */
  54 #define AP_DEVICE_TYPE_PCICC    3
  55 #define AP_DEVICE_TYPE_PCICA    4
  56 #define AP_DEVICE_TYPE_PCIXCC   5
  57 #define AP_DEVICE_TYPE_CEX2A    6
  58 #define AP_DEVICE_TYPE_CEX2C    7
  59 #define AP_DEVICE_TYPE_CEX3A    8
  60 #define AP_DEVICE_TYPE_CEX3C    9
  61 #define AP_DEVICE_TYPE_CEX4     10
  62 #define AP_DEVICE_TYPE_CEX5     11
  63 #define AP_DEVICE_TYPE_CEX6     12
  64
  65 /*
  66  * Known function facilities
  67  */
  68 #define AP_FUNC_MEX4K 1
  69 #define AP_FUNC_CRT4K 2
  70 #define AP_FUNC_COPRO 3
  71 #define AP_FUNC_ACCEL 4
  72 #define AP_FUNC_EP11  5
  73 #define AP_FUNC_APXA  6
  74
  75 /*
  76  * AP interrupt states
  77  */
  78 #define AP_INTR_DISABLED        0       /* AP interrupt disabled */
  79 #define AP_INTR_ENABLED         1       /* AP interrupt enabled */
  80
  81 /*
  82  * AP device states
  83  */
  84 enum ap_state {
  85         AP_STATE_RESET_START,
  86         AP_STATE_RESET_WAIT,
  87         AP_STATE_SETIRQ_WAIT,
  88         AP_STATE_IDLE,
  89         AP_STATE_WORKING,
  90         AP_STATE_QUEUE_FULL,
  91         AP_STATE_SUSPEND_WAIT,
  92         AP_STATE_BORKED,
  93         NR_AP_STATES
  94 };
  95
  96 /*
  97  * AP device events
  98  */
  99 enum ap_event {
 100         AP_EVENT_POLL,
 101         AP_EVENT_TIMEOUT,
 102         NR_AP_EVENTS
 103 };
 104
 105 /*
 106  * AP wait behaviour
 107  */
 108 enum ap_wait {
 109         AP_WAIT_AGAIN,          /* retry immediately */
 110         AP_WAIT_TIMEOUT,        /* wait for timeout */
 111         AP_WAIT_INTERRUPT,      /* wait for thin interrupt (if available) */
 112         AP_WAIT_NONE,           /* no wait */
 113         NR_AP_WAIT
 114 };
 115
 116 struct ap_device;
 117 struct ap_message;
 118
 119 struct ap_driver {
 120         struct device_driver driver;
 121         struct ap_device_id *ids;
 122
 123         int (*probe)(struct ap_device *);
 124         void (*remove)(struct ap_device *);
 125         void (*suspend)(struct ap_device *);
 126         void (*resume)(struct ap_device *);
 127 };
 128
 129 #define to_ap_drv(x) container_of((x), struct ap_driver, driver)
 130
 131 int ap_driver_register(struct ap_driver *, struct module *, char *);
 132 void ap_driver_unregister(struct ap_driver *);
 133
 134 struct ap_device {
 135         struct device device;
 136         struct ap_driver *drv;          /* Pointer to AP device driver. */
 137         int device_type;                /* AP device type. */
 138 };
 139
 140 #define to_ap_dev(x) container_of((x), struct ap_device, device)
 141
 142 struct ap_card {
 143         struct ap_device ap_dev;
 144         struct list_head list;          /* Private list of AP cards. */
 145         struct list_head queues;        /* List of assoc. AP queues */
 146         void *private;                  /* ap driver private pointer. */
 147         int raw_hwtype;                 /* AP raw hardware type. */
 148         unsigned int functions;         /* AP device function bitfield. */
 149         int queue_depth;                /* AP queue depth.*/
 150         int id;                         /* AP card number. */
 151         atomic_t total_request_count;   /* # requests ever for this AP device.*/
 152 };
 153
 154 #define to_ap_card(x) container_of((x), struct ap_card, ap_dev.device)
 155
 156 struct ap_queue {
 157         struct ap_device ap_dev;
 158         struct list_head list;          /* Private list of AP queues. */
 159         struct ap_card *card;           /* Ptr to assoc. AP card. */
 160         spinlock_t lock;                /* Per device lock. */
 161         void *private;                  /* ap driver private pointer. */
 162         ap_qid_t qid;                   /* AP queue id. */
 163         int interrupt;                  /* indicate if interrupts are enabled */
 164         int queue_count;                /* # messages currently on AP queue. */
 165         enum ap_state state;            /* State of the AP device. */
 166         int pendingq_count;             /* # requests on pendingq list. */
 167         int requestq_count;             /* # requests on requestq list. */
 168         int total_request_count;        /* # requests ever for this AP device.*/
 169         int request_timeout;            /* Request timout in jiffies. */
 170         struct timer_list timeout;      /* Timer for request timeouts. */
 171         struct list_head pendingq;      /* List of message sent to AP queue. */
 172         struct list_head requestq;      /* List of message yet to be sent. */
 173         struct ap_message *reply;       /* Per device reply message. */
 174 };
 175
 176 #define to_ap_queue(x) container_of((x), struct ap_queue, ap_dev.device)
 177
 178 typedef enum ap_wait (ap_func_t)(struct ap_queue *queue);
 179
 180 struct ap_message {
 181         struct list_head list;          /* Request queueing. */
 182         unsigned long long psmid;       /* Message id. */
 183         void *message;                  /* Pointer to message buffer. */
 184         size_t length;                  /* Message length. */
 185         int rc;                         /* Return code for this message */
 186
 187         void *private;                  /* ap driver private pointer. */
 188         unsigned int special:1;         /* Used for special commands. */
 189         /* receive is called from tasklet context */
 190         void (*receive)(struct ap_queue *, struct ap_message *,
 191                         struct ap_message *);
 192 };
 193
 194 /**
 195  * ap_init_message() - Initialize ap_message.
 196  * Initialize a message before using. Otherwise this might result in
 197  * unexpected behaviour.
 198  */
 199 static inline void ap_init_message(struct ap_message *ap_msg)
 200 {
 201         ap_msg->psmid = 0;
 202         ap_msg->length = 0;
 203         ap_msg->rc = 0;
 204         ap_msg->special = 0;
 205         ap_msg->receive = NULL;
 206 }
 207
 208 #define for_each_ap_card(_ac) \
 209         list_for_each_entry(_ac, &ap_card_list, list)
 210
 211 #define for_each_ap_queue(_aq, _ac) \
 212         list_for_each_entry(_aq, &(_ac)->queues, list)
 213
 214 /*
 215  * Note: don't use ap_send/ap_recv after using ap_queue_message
 216  * for the first time. Otherwise the ap message queue will get
 217  * confused.
 218  */
 219 int ap_send(ap_qid_t, unsigned long long, void *, size_t);
 220 int ap_recv(ap_qid_t, unsigned long long *, void *, size_t);
 221
 222 enum ap_wait ap_sm_event(struct ap_queue *aq, enum ap_event event);
 223 enum ap_wait ap_sm_event_loop(struct ap_queue *aq, enum ap_event event);
 224
 225 void ap_queue_message(struct ap_queue *aq, struct ap_message *ap_msg);
 226 void ap_cancel_message(struct ap_queue *aq, struct ap_message *ap_msg);
 227 void ap_flush_queue(struct ap_queue *aq);
 228
 229 void *ap_airq_ptr(void);
 230 void ap_wait(enum ap_wait wait);
 231 void ap_request_timeout(struct timer_list *t);
 232 void ap_bus_force_rescan(void);
 233
 234 void ap_queue_init_reply(struct ap_queue *aq, struct ap_message *ap_msg);
 235 struct ap_queue *ap_queue_create(ap_qid_t qid, int device_type);
 236 void ap_queue_remove(struct ap_queue *aq);
 237 void ap_queue_suspend(struct ap_device *ap_dev);
 238 void ap_queue_resume(struct ap_device *ap_dev);
 239
 240 struct ap_card *ap_card_create(int id, int queue_depth, int raw_device_type,
 241                                int comp_device_type, unsigned int functions);
 242
 243 int ap_module_init(void);
 244 void ap_module_exit(void);
 245
 246 #endif /* _AP_BUS_H_ */