ccwdev.h (8506B)
1/* SPDX-License-Identifier: GPL-2.0 */ 2/* 3 * Copyright IBM Corp. 2002, 2009 4 * 5 * Author(s): Arnd Bergmann <arndb@de.ibm.com> 6 * 7 * Interface for CCW device drivers 8 */ 9#ifndef _S390_CCWDEV_H_ 10#define _S390_CCWDEV_H_ 11 12#include <linux/device.h> 13#include <linux/mod_devicetable.h> 14#include <asm/chsc.h> 15#include <asm/fcx.h> 16#include <asm/irq.h> 17#include <asm/schid.h> 18 19/* structs from asm/cio.h */ 20struct irb; 21struct ccw1; 22struct ccw_dev_id; 23 24/* simplified initializers for struct ccw_device: 25 * CCW_DEVICE and CCW_DEVICE_DEVTYPE initialize one 26 * entry in your MODULE_DEVICE_TABLE and set the match_flag correctly */ 27#define CCW_DEVICE(cu, cum) \ 28 .cu_type=(cu), .cu_model=(cum), \ 29 .match_flags=(CCW_DEVICE_ID_MATCH_CU_TYPE \ 30 | (cum ? CCW_DEVICE_ID_MATCH_CU_MODEL : 0)) 31 32#define CCW_DEVICE_DEVTYPE(cu, cum, dev, devm) \ 33 .cu_type=(cu), .cu_model=(cum), .dev_type=(dev), .dev_model=(devm),\ 34 .match_flags=CCW_DEVICE_ID_MATCH_CU_TYPE \ 35 | ((cum) ? CCW_DEVICE_ID_MATCH_CU_MODEL : 0) \ 36 | CCW_DEVICE_ID_MATCH_DEVICE_TYPE \ 37 | ((devm) ? CCW_DEVICE_ID_MATCH_DEVICE_MODEL : 0) 38 39/* scan through an array of device ids and return the first 40 * entry that matches the device. 41 * 42 * the array must end with an entry containing zero match_flags 43 */ 44static inline const struct ccw_device_id * 45ccw_device_id_match(const struct ccw_device_id *array, 46 const struct ccw_device_id *match) 47{ 48 const struct ccw_device_id *id = array; 49 50 for (id = array; id->match_flags; id++) { 51 if ((id->match_flags & CCW_DEVICE_ID_MATCH_CU_TYPE) 52 && (id->cu_type != match->cu_type)) 53 continue; 54 55 if ((id->match_flags & CCW_DEVICE_ID_MATCH_CU_MODEL) 56 && (id->cu_model != match->cu_model)) 57 continue; 58 59 if ((id->match_flags & CCW_DEVICE_ID_MATCH_DEVICE_TYPE) 60 && (id->dev_type != match->dev_type)) 61 continue; 62 63 if ((id->match_flags & CCW_DEVICE_ID_MATCH_DEVICE_MODEL) 64 && (id->dev_model != match->dev_model)) 65 continue; 66 67 return id; 68 } 69 70 return NULL; 71} 72 73/** 74 * struct ccw_device - channel attached device 75 * @ccwlock: pointer to device lock 76 * @id: id of this device 77 * @drv: ccw driver for this device 78 * @dev: embedded device structure 79 * @online: online status of device 80 * @handler: interrupt handler 81 * 82 * @handler is a member of the device rather than the driver since a driver 83 * can have different interrupt handlers for different ccw devices 84 * (multi-subchannel drivers). 85 */ 86struct ccw_device { 87 spinlock_t *ccwlock; 88/* private: */ 89 struct ccw_device_private *private; /* cio private information */ 90/* public: */ 91 struct ccw_device_id id; 92 struct ccw_driver *drv; 93 struct device dev; 94 int online; 95 void (*handler) (struct ccw_device *, unsigned long, struct irb *); 96}; 97 98/* 99 * Possible events used by the path_event notifier. 100 */ 101#define PE_NONE 0x0 102#define PE_PATH_GONE 0x1 /* A path is no longer available. */ 103#define PE_PATH_AVAILABLE 0x2 /* A path has become available and 104 was successfully verified. */ 105#define PE_PATHGROUP_ESTABLISHED 0x4 /* A pathgroup was reset and had 106 to be established again. */ 107#define PE_PATH_FCES_EVENT 0x8 /* The FCES Status of a path has 108 * changed. */ 109 110/* 111 * Possible CIO actions triggered by the unit check handler. 112 */ 113enum uc_todo { 114 UC_TODO_RETRY, 115 UC_TODO_RETRY_ON_NEW_PATH, 116 UC_TODO_STOP 117}; 118 119/** 120 * struct ccw_driver - device driver for channel attached devices 121 * @ids: ids supported by this driver 122 * @probe: function called on probe 123 * @remove: function called on remove 124 * @set_online: called when setting device online 125 * @set_offline: called when setting device offline 126 * @notify: notify driver of device state changes 127 * @path_event: notify driver of channel path events 128 * @shutdown: called at device shutdown 129 * @uc_handler: callback for unit check handler 130 * @driver: embedded device driver structure 131 * @int_class: interruption class to use for accounting interrupts 132 */ 133struct ccw_driver { 134 struct ccw_device_id *ids; 135 int (*probe) (struct ccw_device *); 136 void (*remove) (struct ccw_device *); 137 int (*set_online) (struct ccw_device *); 138 int (*set_offline) (struct ccw_device *); 139 int (*notify) (struct ccw_device *, int); 140 void (*path_event) (struct ccw_device *, int *); 141 void (*shutdown) (struct ccw_device *); 142 enum uc_todo (*uc_handler) (struct ccw_device *, struct irb *); 143 struct device_driver driver; 144 enum interruption_class int_class; 145}; 146 147extern struct ccw_device *get_ccwdev_by_busid(struct ccw_driver *cdrv, 148 const char *bus_id); 149 150/* devices drivers call these during module load and unload. 151 * When a driver is registered, its probe method is called 152 * when new devices for its type pop up */ 153extern int ccw_driver_register (struct ccw_driver *driver); 154extern void ccw_driver_unregister (struct ccw_driver *driver); 155extern int ccw_device_set_options_mask(struct ccw_device *, unsigned long); 156extern int ccw_device_set_options(struct ccw_device *, unsigned long); 157extern void ccw_device_clear_options(struct ccw_device *, unsigned long); 158int ccw_device_is_pathgroup(struct ccw_device *cdev); 159int ccw_device_is_multipath(struct ccw_device *cdev); 160 161/* Allow for i/o completion notification after primary interrupt status. */ 162#define CCWDEV_EARLY_NOTIFICATION 0x0001 163/* Report all interrupt conditions. */ 164#define CCWDEV_REPORT_ALL 0x0002 165/* Try to perform path grouping. */ 166#define CCWDEV_DO_PATHGROUP 0x0004 167/* Allow forced onlining of boxed devices. */ 168#define CCWDEV_ALLOW_FORCE 0x0008 169/* Try to use multipath mode. */ 170#define CCWDEV_DO_MULTIPATH 0x0010 171 172extern int ccw_device_start(struct ccw_device *, struct ccw1 *, 173 unsigned long, __u8, unsigned long); 174extern int ccw_device_start_timeout(struct ccw_device *, struct ccw1 *, 175 unsigned long, __u8, unsigned long, int); 176extern int ccw_device_start_key(struct ccw_device *, struct ccw1 *, 177 unsigned long, __u8, __u8, unsigned long); 178extern int ccw_device_start_timeout_key(struct ccw_device *, struct ccw1 *, 179 unsigned long, __u8, __u8, 180 unsigned long, int); 181 182 183extern int ccw_device_resume(struct ccw_device *); 184extern int ccw_device_halt(struct ccw_device *, unsigned long); 185extern int ccw_device_clear(struct ccw_device *, unsigned long); 186int ccw_device_tm_start_key(struct ccw_device *cdev, struct tcw *tcw, 187 unsigned long intparm, u8 lpm, u8 key); 188int ccw_device_tm_start_key(struct ccw_device *, struct tcw *, 189 unsigned long, u8, u8); 190int ccw_device_tm_start_timeout_key(struct ccw_device *, struct tcw *, 191 unsigned long, u8, u8, int); 192int ccw_device_tm_start(struct ccw_device *, struct tcw *, 193 unsigned long, u8); 194int ccw_device_tm_start_timeout(struct ccw_device *, struct tcw *, 195 unsigned long, u8, int); 196int ccw_device_tm_intrg(struct ccw_device *cdev); 197 198int ccw_device_get_mdc(struct ccw_device *cdev, u8 mask); 199 200extern int ccw_device_set_online(struct ccw_device *cdev); 201extern int ccw_device_set_offline(struct ccw_device *cdev); 202 203 204extern struct ciw *ccw_device_get_ciw(struct ccw_device *, __u32 cmd); 205extern __u8 ccw_device_get_path_mask(struct ccw_device *); 206extern void ccw_device_get_id(struct ccw_device *, struct ccw_dev_id *); 207 208#define get_ccwdev_lock(x) (x)->ccwlock 209 210#define to_ccwdev(n) container_of(n, struct ccw_device, dev) 211#define to_ccwdrv(n) container_of(n, struct ccw_driver, driver) 212 213extern struct ccw_device *ccw_device_create_console(struct ccw_driver *); 214extern void ccw_device_destroy_console(struct ccw_device *); 215extern int ccw_device_enable_console(struct ccw_device *); 216extern void ccw_device_wait_idle(struct ccw_device *); 217extern int ccw_device_force_console(struct ccw_device *); 218 219extern void *ccw_device_dma_zalloc(struct ccw_device *cdev, size_t size); 220extern void ccw_device_dma_free(struct ccw_device *cdev, 221 void *cpu_addr, size_t size); 222 223int ccw_device_siosl(struct ccw_device *); 224 225extern void ccw_device_get_schid(struct ccw_device *, struct subchannel_id *); 226 227struct channel_path_desc_fmt0 *ccw_device_get_chp_desc(struct ccw_device *, int); 228u8 *ccw_device_get_util_str(struct ccw_device *cdev, int chp_idx); 229int ccw_device_pnso(struct ccw_device *cdev, 230 struct chsc_pnso_area *pnso_area, u8 oc, 231 struct chsc_pnso_resume_token resume_token, int cnc); 232int ccw_device_get_cssid(struct ccw_device *cdev, u8 *cssid); 233int ccw_device_get_iid(struct ccw_device *cdev, u8 *iid); 234int ccw_device_get_chpid(struct ccw_device *cdev, int chp_idx, u8 *chpid); 235int ccw_device_get_chid(struct ccw_device *cdev, int chp_idx, u16 *chid); 236#endif /* _S390_CCWDEV_H_ */