4 #include <linux/mutex.h>
5 #include <linux/wait.h>
6 #include <linux/workqueue.h>
7 #include <linux/device.h>
8 #include <linux/types.h>
11 #include <asm/chpid.h>
18 #define SPID_FUNC_SINGLE_PATH 0x00
19 #define SPID_FUNC_MULTI_PATH 0x80
20 #define SPID_FUNC_ESTABLISH 0x00
21 #define SPID_FUNC_RESIGN 0x40
22 #define SPID_FUNC_DISBAND 0x20
24 #define SNID_STATE1_RESET 0
25 #define SNID_STATE1_UNGROUPED 2
26 #define SNID_STATE1_GROUPED 3
28 #define SNID_STATE2_NOT_RESVD 0
29 #define SNID_STATE2_RESVD_ELSE 2
30 #define SNID_STATE2_RESVD_SELF 3
32 #define SNID_STATE3_MULTI_PATH 1
33 #define SNID_STATE3_SINGLE_PATH 0
36 __u8 state1 : 2; /* path state value 1 */
37 __u8 state2 : 2; /* path state value 2 */
38 __u8 state3 : 1; /* path state value 3 */
39 __u8 resvd : 3; /* reserved */
40 } __attribute__ ((packed));
42 struct extended_cssid {
45 } __attribute__ ((packed));
49 __u8 fc; /* SPID function code */
50 struct path_state ps; /* SNID path state */
51 } __attribute__ ((packed)) inf;
53 __u32 cpu_addr : 16; /* CPU address */
54 struct extended_cssid ext_cssid;
55 } __attribute__ ((packed)) pgid_high;
56 __u32 cpu_id : 24; /* CPU identification */
57 __u32 cpu_model : 16; /* CPU model */
58 __u32 tod_high; /* high word TOD clock */
59 } __attribute__ ((packed));
64 * sense-id response buffer layout
68 __u8 reserved; /* always 0x'FF' */
69 __u16 cu_type; /* control unit type */
70 __u8 cu_model; /* control unit model */
71 __u16 dev_type; /* device type */
72 __u8 dev_model; /* device model */
73 __u8 unused; /* padding byte */
75 struct ciw ciw[MAX_CIWS]; /* variable # of CIWs */
76 } __attribute__ ((packed,aligned(4)));
78 struct ccw_device_private {
79 struct ccw_device *cdev;
80 struct subchannel *sch;
81 int state; /* device state */
83 unsigned long registered;
84 struct ccw_dev_id dev_id; /* device id */
85 struct subchannel_id schid; /* subchannel number */
86 __u8 imask; /* lpm mask for SNID/SID/SPGID */
87 int iretry; /* retry counter SNID/SID/SPGID */
89 unsigned int fast:1; /* post with "channel end" */
90 unsigned int repall:1; /* report every interrupt status */
91 unsigned int pgroup:1; /* do path grouping */
92 unsigned int force:1; /* allow forced online */
93 } __attribute__ ((packed)) options;
95 unsigned int pgid_single:1; /* use single path for Set PGID */
96 unsigned int esid:1; /* Ext. SenseID supported by HW */
97 unsigned int dosense:1; /* delayed SENSE required */
98 unsigned int doverify:1; /* delayed path verification */
99 unsigned int donotify:1; /* call notify function */
100 unsigned int recog_done:1; /* dev. recog. complete */
101 unsigned int fake_irb:1; /* deliver faked irb */
102 unsigned int intretry:1; /* retry internal operation */
103 } __attribute__((packed)) flags;
104 unsigned long intparm; /* user interruption parameter */
105 struct qdio_irq *qdio_data;
106 struct irb irb; /* device status */
107 struct senseid senseid; /* SenseID info */
108 struct pgid pgid[8]; /* path group IDs per chpid*/
109 struct ccw1 iccws[2]; /* ccws for SNID/SID/SPGID commands */
110 struct work_struct kick_work;
111 wait_queue_head_t wait_q;
112 struct timer_list timer;
113 void *cmb; /* measurement information */
114 struct list_head cmb_list; /* list of measured devices */
115 u64 cmb_start_time; /* clock value of cmb reset */
116 void *cmb_wait; /* deferred cmb enable/disable */
120 * A css driver handles all subchannels of one type.
121 * Currently, we only care about I/O subchannels (type 0), these
122 * have a ccw_device connected to them.
126 unsigned int subchannel_type;
127 struct device_driver drv;
128 void (*irq)(struct device *);
129 int (*notify)(struct device *, int);
130 void (*verify)(struct device *);
131 void (*termination)(struct device *);
132 int (*probe)(struct subchannel *);
133 int (*remove)(struct subchannel *);
134 void (*shutdown)(struct subchannel *);
138 * all css_drivers have the css_bus_type
140 extern struct bus_type css_bus_type;
142 extern void css_sch_device_unregister(struct subchannel *);
143 extern struct subchannel * get_subchannel_by_schid(struct subchannel_id);
144 extern int css_init_done;
145 extern int for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *);
146 extern void css_process_crw(int, int);
147 extern void css_reiterate_subchannels(void);
148 void css_update_ssd_info(struct subchannel *sch);
150 #define __MAX_SUBCHANNEL 65535
153 struct channel_subsystem {
156 struct channel_path *chps[__MAX_CHPID + 1];
157 struct device device;
158 struct pgid global_pgid;
160 /* channel measurement related */
164 /* for orphaned ccw devices */
165 struct subchannel *pseudo_subchannel;
167 #define to_css(dev) container_of(dev, struct channel_subsystem, device)
169 extern struct bus_type css_bus_type;
170 extern struct channel_subsystem *channel_subsystems[];
172 /* Some helper functions for disconnected state. */
173 int device_is_disconnected(struct subchannel *);
174 void device_set_disconnected(struct subchannel *);
175 void device_trigger_reprobe(struct subchannel *);
177 /* Helper functions for vary on/off. */
178 int device_is_online(struct subchannel *);
179 void device_kill_io(struct subchannel *);
180 void device_set_intretry(struct subchannel *sch);
181 int device_trigger_verify(struct subchannel *sch);
183 /* Machine check helper function. */
184 void device_kill_pending_timer(struct subchannel *);
186 /* Helper functions to build lists for the slow path. */
187 void css_schedule_eval(struct subchannel_id schid);
188 void css_schedule_eval_all(void);
190 int sch_is_pseudo_sch(struct subchannel *);
192 extern struct workqueue_struct *slow_path_wq;
194 extern struct attribute_group *subch_attr_groups[];