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Diffstat (limited to '')
| -rw-r--r-- | drivers/s390/crypto/ap_bus.h | 392 |
1 files changed, 392 insertions, 0 deletions
diff --git a/drivers/s390/crypto/ap_bus.h b/drivers/s390/crypto/ap_bus.h new file mode 100644 index 000000000..0f1793395 --- /dev/null +++ b/drivers/s390/crypto/ap_bus.h @@ -0,0 +1,392 @@ +/* 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. */ +#define AP_DEFAULT_MAX_MSG_SIZE (12 * 1024) +#define AP_TAPQ_ML_FIELD_CHUNK_SIZE (4096) + +extern int ap_domain_index; +extern atomic_t ap_max_msg_size; + +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_INVALID_GISA 0x08 +#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 +#define AP_DEVICE_TYPE_CEX8 14 + +/* + * 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 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 = 0, /* 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 *); + int (*in_use)(unsigned long *apm, unsigned long *aqm); + /* + * Called at the start of the ap bus scan function when + * the crypto config information (qci) has changed. + * This callback is not invoked if there is no AP + * QCI support available. + */ + void (*on_config_changed)(struct ap_config_info *new_config_info, + struct ap_config_info *old_config_info); + /* + * Called at the end of the ap bus scan function when + * the crypto config information (qci) has changed. + * This callback is not invoked if there is no AP + * QCI support available. + */ + void (*on_scan_complete)(struct ap_config_info *new_config_info, + struct ap_config_info *old_config_info); +}; + +#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; + 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; + 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. */ + unsigned int maxmsgsize; /* AP msg limit for this card */ + bool config; /* configured state */ + bool chkstop; /* checkstop 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. */ + enum ap_dev_state dev_state; /* queue device state */ + bool config; /* configured state */ + bool chkstop; /* checkstop state */ + ap_qid_t qid; /* AP queue id. */ + bool 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; /* actual msg len in msg buffer */ + unsigned int bufsize; /* allocated msg buffer size */ + 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 0x0001 /* flag msg as 'special' with NQAP */ +#define AP_MSG_FLAG_USAGE 0x0002 /* CCA, EP11: usage (no admin) msg */ +#define AP_MSG_FLAG_ADMIN 0x0004 /* CCA, EP11: admin (=control) msg */ + +/** + * 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_type, + int comp_type, unsigned int functions, int ml); + +#define APMASKSIZE (BITS_TO_LONGS(AP_DEVICES) * sizeof(unsigned long)) +#define AQMASKSIZE (BITS_TO_LONGS(AP_DOMAINS) * sizeof(unsigned long)) + +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)]; + unsigned long adm[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); + +void ap_send_config_uevent(struct ap_device *ap_dev, bool cfg); +void ap_send_online_uevent(struct ap_device *ap_dev, int online); + +#endif /* _AP_BUS_H_ */ |