1 #ifndef S390_IO_SCH_H
2 #define S390_IO_SCH_H
3
4 #include <linux/types.h>
5 #include <asm/schid.h>
6 #include <asm/ccwdev.h>
7 #include "css.h"
8 #include "orb.h"
9
10 struct io_subchannel_private {
11 union orb orb; /* operation request block */
12 struct ccw1 sense_ccw; /* static ccw for sense command */
13 struct ccw_device *cdev;/* pointer to the child ccw device */
14 struct {
15 unsigned int suspend:1; /* allow suspend */
16 unsigned int prefetch:1;/* deny prefetch */
17 unsigned int inter:1; /* suppress intermediate interrupts */
18 } __packed options;
19 } __aligned(8);
20
21 #define to_io_private(n) ((struct io_subchannel_private *) \
22 dev_get_drvdata(&(n)->dev))
23 #define set_io_private(n, p) (dev_set_drvdata(&(n)->dev, p))
24
sch_get_cdev(struct subchannel * sch)25 static inline struct ccw_device *sch_get_cdev(struct subchannel *sch)
26 {
27 struct io_subchannel_private *priv = to_io_private(sch);
28 return priv ? priv->cdev : NULL;
29 }
30
sch_set_cdev(struct subchannel * sch,struct ccw_device * cdev)31 static inline void sch_set_cdev(struct subchannel *sch,
32 struct ccw_device *cdev)
33 {
34 struct io_subchannel_private *priv = to_io_private(sch);
35 if (priv)
36 priv->cdev = cdev;
37 }
38
39 #define MAX_CIWS 8
40
41 /*
42 * Possible status values for a CCW request's I/O.
43 */
44 enum io_status {
45 IO_DONE,
46 IO_RUNNING,
47 IO_STATUS_ERROR,
48 IO_PATH_ERROR,
49 IO_REJECTED,
50 IO_KILLED
51 };
52
53 /**
54 * ccw_request - Internal CCW request.
55 * @cp: channel program to start
56 * @timeout: maximum allowable time in jiffies between start I/O and interrupt
57 * @maxretries: number of retries per I/O operation and path
58 * @lpm: mask of paths to use
59 * @check: optional callback that determines if results are final
60 * @filter: optional callback to adjust request status based on IRB data
61 * @callback: final callback
62 * @data: user-defined pointer passed to all callbacks
63 * @singlepath: if set, use only one path from @lpm per start I/O
64 * @cancel: non-zero if request was cancelled
65 * @done: non-zero if request was finished
66 * @mask: current path mask
67 * @retries: current number of retries
68 * @drc: delayed return code
69 */
70 struct ccw_request {
71 struct ccw1 *cp;
72 unsigned long timeout;
73 u16 maxretries;
74 u8 lpm;
75 int (*check)(struct ccw_device *, void *);
76 enum io_status (*filter)(struct ccw_device *, void *, struct irb *,
77 enum io_status);
78 void (*callback)(struct ccw_device *, void *, int);
79 void *data;
80 unsigned int singlepath:1;
81 /* These fields are used internally. */
82 unsigned int cancel:1;
83 unsigned int done:1;
84 u16 mask;
85 u16 retries;
86 int drc;
87 } __attribute__((packed));
88
89 /*
90 * sense-id response buffer layout
91 */
92 struct senseid {
93 /* common part */
94 u8 reserved; /* always 0x'FF' */
95 u16 cu_type; /* control unit type */
96 u8 cu_model; /* control unit model */
97 u16 dev_type; /* device type */
98 u8 dev_model; /* device model */
99 u8 unused; /* padding byte */
100 /* extended part */
101 struct ciw ciw[MAX_CIWS]; /* variable # of CIWs */
102 } __attribute__ ((packed, aligned(4)));
103
104 enum cdev_todo {
105 CDEV_TODO_NOTHING,
106 CDEV_TODO_ENABLE_CMF,
107 CDEV_TODO_REBIND,
108 CDEV_TODO_REGISTER,
109 CDEV_TODO_UNREG,
110 CDEV_TODO_UNREG_EVAL,
111 };
112
113 struct ccw_device_private {
114 struct ccw_device *cdev;
115 struct subchannel *sch;
116 int state; /* device state */
117 atomic_t onoff;
118 struct ccw_dev_id dev_id; /* device id */
119 struct subchannel_id schid; /* subchannel number */
120 struct ccw_request req; /* internal I/O request */
121 int iretry;
122 u8 pgid_valid_mask; /* mask of valid PGIDs */
123 u8 pgid_todo_mask; /* mask of PGIDs to be adjusted */
124 u8 pgid_reset_mask; /* mask of PGIDs which were reset */
125 u8 path_gone_mask; /* mask of paths, that became unavailable */
126 u8 path_new_mask; /* mask of paths, that became available */
127 struct {
128 unsigned int fast:1; /* post with "channel end" */
129 unsigned int repall:1; /* report every interrupt status */
130 unsigned int pgroup:1; /* do path grouping */
131 unsigned int force:1; /* allow forced online */
132 unsigned int mpath:1; /* do multipathing */
133 } __attribute__ ((packed)) options;
134 struct {
135 unsigned int esid:1; /* Ext. SenseID supported by HW */
136 unsigned int dosense:1; /* delayed SENSE required */
137 unsigned int doverify:1; /* delayed path verification */
138 unsigned int donotify:1; /* call notify function */
139 unsigned int recog_done:1; /* dev. recog. complete */
140 unsigned int fake_irb:1; /* deliver faked irb */
141 unsigned int resuming:1; /* recognition while resume */
142 unsigned int pgroup:1; /* pathgroup is set up */
143 unsigned int mpath:1; /* multipathing is set up */
144 unsigned int initialized:1; /* set if initial reference held */
145 } __attribute__((packed)) flags;
146 unsigned long intparm; /* user interruption parameter */
147 struct qdio_irq *qdio_data;
148 struct irb irb; /* device status */
149 struct senseid senseid; /* SenseID info */
150 struct pgid pgid[8]; /* path group IDs per chpid*/
151 struct ccw1 iccws[2]; /* ccws for SNID/SID/SPGID commands */
152 struct work_struct todo_work;
153 enum cdev_todo todo;
154 wait_queue_head_t wait_q;
155 struct timer_list timer;
156 void *cmb; /* measurement information */
157 struct list_head cmb_list; /* list of measured devices */
158 u64 cmb_start_time; /* clock value of cmb reset */
159 void *cmb_wait; /* deferred cmb enable/disable */
160 };
161
rsch(struct subchannel_id schid)162 static inline int rsch(struct subchannel_id schid)
163 {
164 register struct subchannel_id reg1 asm("1") = schid;
165 int ccode;
166
167 asm volatile(
168 " rsch\n"
169 " ipm %0\n"
170 " srl %0,28"
171 : "=d" (ccode)
172 : "d" (reg1)
173 : "cc", "memory");
174 return ccode;
175 }
176
hsch(struct subchannel_id schid)177 static inline int hsch(struct subchannel_id schid)
178 {
179 register struct subchannel_id reg1 asm("1") = schid;
180 int ccode;
181
182 asm volatile(
183 " hsch\n"
184 " ipm %0\n"
185 " srl %0,28"
186 : "=d" (ccode)
187 : "d" (reg1)
188 : "cc");
189 return ccode;
190 }
191
xsch(struct subchannel_id schid)192 static inline int xsch(struct subchannel_id schid)
193 {
194 register struct subchannel_id reg1 asm("1") = schid;
195 int ccode;
196
197 asm volatile(
198 " .insn rre,0xb2760000,%1,0\n"
199 " ipm %0\n"
200 " srl %0,28"
201 : "=d" (ccode)
202 : "d" (reg1)
203 : "cc");
204 return ccode;
205 }
206
207 #endif
208