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 <asm/irq.h>
8 #include "css.h"
9 #include "orb.h"
10
11 struct io_subchannel_private {
12 union orb orb; /* operation request block */
13 struct ccw1 sense_ccw; /* static ccw for sense command */
14 struct ccw_device *cdev;/* pointer to the child ccw device */
15 struct {
16 unsigned int suspend:1; /* allow suspend */
17 unsigned int prefetch:1;/* deny prefetch */
18 unsigned int inter:1; /* suppress intermediate interrupts */
19 } __packed options;
20 } __aligned(8);
21
22 #define to_io_private(n) ((struct io_subchannel_private *) \
23 dev_get_drvdata(&(n)->dev))
24 #define set_io_private(n, p) (dev_set_drvdata(&(n)->dev, p))
25
sch_get_cdev(struct subchannel * sch)26 static inline struct ccw_device *sch_get_cdev(struct subchannel *sch)
27 {
28 struct io_subchannel_private *priv = to_io_private(sch);
29 return priv ? priv->cdev : NULL;
30 }
31
sch_set_cdev(struct subchannel * sch,struct ccw_device * cdev)32 static inline void sch_set_cdev(struct subchannel *sch,
33 struct ccw_device *cdev)
34 {
35 struct io_subchannel_private *priv = to_io_private(sch);
36 if (priv)
37 priv->cdev = cdev;
38 }
39
40 #define MAX_CIWS 8
41
42 /*
43 * Possible status values for a CCW request's I/O.
44 */
45 enum io_status {
46 IO_DONE,
47 IO_RUNNING,
48 IO_STATUS_ERROR,
49 IO_PATH_ERROR,
50 IO_REJECTED,
51 IO_KILLED
52 };
53
54 /**
55 * ccw_request - Internal CCW request.
56 * @cp: channel program to start
57 * @timeout: maximum allowable time in jiffies between start I/O and interrupt
58 * @maxretries: number of retries per I/O operation and path
59 * @lpm: mask of paths to use
60 * @check: optional callback that determines if results are final
61 * @filter: optional callback to adjust request status based on IRB data
62 * @callback: final callback
63 * @data: user-defined pointer passed to all callbacks
64 * @singlepath: if set, use only one path from @lpm per start I/O
65 * @cancel: non-zero if request was cancelled
66 * @done: non-zero if request was finished
67 * @mask: current path mask
68 * @retries: current number of retries
69 * @drc: delayed return code
70 */
71 struct ccw_request {
72 struct ccw1 *cp;
73 unsigned long timeout;
74 u16 maxretries;
75 u8 lpm;
76 int (*check)(struct ccw_device *, void *);
77 enum io_status (*filter)(struct ccw_device *, void *, struct irb *,
78 enum io_status);
79 void (*callback)(struct ccw_device *, void *, int);
80 void *data;
81 unsigned int singlepath:1;
82 /* These fields are used internally. */
83 unsigned int cancel:1;
84 unsigned int done:1;
85 u16 mask;
86 u16 retries;
87 int drc;
88 } __attribute__((packed));
89
90 /*
91 * sense-id response buffer layout
92 */
93 struct senseid {
94 /* common part */
95 u8 reserved; /* always 0x'FF' */
96 u16 cu_type; /* control unit type */
97 u8 cu_model; /* control unit model */
98 u16 dev_type; /* device type */
99 u8 dev_model; /* device model */
100 u8 unused; /* padding byte */
101 /* extended part */
102 struct ciw ciw[MAX_CIWS]; /* variable # of CIWs */
103 } __attribute__ ((packed, aligned(4)));
104
105 enum cdev_todo {
106 CDEV_TODO_NOTHING,
107 CDEV_TODO_ENABLE_CMF,
108 CDEV_TODO_REBIND,
109 CDEV_TODO_REGISTER,
110 CDEV_TODO_UNREG,
111 CDEV_TODO_UNREG_EVAL,
112 };
113
114 #define FAKE_CMD_IRB 1
115 #define FAKE_TM_IRB 2
116
117 struct ccw_device_private {
118 struct ccw_device *cdev;
119 struct subchannel *sch;
120 int state; /* device state */
121 atomic_t onoff;
122 struct ccw_dev_id dev_id; /* device id */
123 struct subchannel_id schid; /* subchannel number */
124 struct ccw_request req; /* internal I/O request */
125 int iretry;
126 u8 pgid_valid_mask; /* mask of valid PGIDs */
127 u8 pgid_todo_mask; /* mask of PGIDs to be adjusted */
128 u8 pgid_reset_mask; /* mask of PGIDs which were reset */
129 u8 path_gone_mask; /* mask of paths, that became unavailable */
130 u8 path_new_mask; /* mask of paths, that became available */
131 struct {
132 unsigned int fast:1; /* post with "channel end" */
133 unsigned int repall:1; /* report every interrupt status */
134 unsigned int pgroup:1; /* do path grouping */
135 unsigned int force:1; /* allow forced online */
136 unsigned int mpath:1; /* do multipathing */
137 } __attribute__ ((packed)) options;
138 struct {
139 unsigned int esid:1; /* Ext. SenseID supported by HW */
140 unsigned int dosense:1; /* delayed SENSE required */
141 unsigned int doverify:1; /* delayed path verification */
142 unsigned int donotify:1; /* call notify function */
143 unsigned int recog_done:1; /* dev. recog. complete */
144 unsigned int fake_irb:2; /* deliver faked irb */
145 unsigned int resuming:1; /* recognition while resume */
146 unsigned int pgroup:1; /* pathgroup is set up */
147 unsigned int mpath:1; /* multipathing is set up */
148 unsigned int initialized:1; /* set if initial reference held */
149 } __attribute__((packed)) flags;
150 unsigned long intparm; /* user interruption parameter */
151 struct qdio_irq *qdio_data;
152 struct irb irb; /* device status */
153 struct senseid senseid; /* SenseID info */
154 struct pgid pgid[8]; /* path group IDs per chpid*/
155 struct ccw1 iccws[2]; /* ccws for SNID/SID/SPGID commands */
156 struct work_struct todo_work;
157 enum cdev_todo todo;
158 wait_queue_head_t wait_q;
159 struct timer_list timer;
160 void *cmb; /* measurement information */
161 struct list_head cmb_list; /* list of measured devices */
162 u64 cmb_start_time; /* clock value of cmb reset */
163 void *cmb_wait; /* deferred cmb enable/disable */
164 enum interruption_class int_class;
165 };
166
rsch(struct subchannel_id schid)167 static inline int rsch(struct subchannel_id schid)
168 {
169 register struct subchannel_id reg1 asm("1") = schid;
170 int ccode;
171
172 asm volatile(
173 " rsch\n"
174 " ipm %0\n"
175 " srl %0,28"
176 : "=d" (ccode)
177 : "d" (reg1)
178 : "cc", "memory");
179 return ccode;
180 }
181
hsch(struct subchannel_id schid)182 static inline int hsch(struct subchannel_id schid)
183 {
184 register struct subchannel_id reg1 asm("1") = schid;
185 int ccode;
186
187 asm volatile(
188 " hsch\n"
189 " ipm %0\n"
190 " srl %0,28"
191 : "=d" (ccode)
192 : "d" (reg1)
193 : "cc");
194 return ccode;
195 }
196
xsch(struct subchannel_id schid)197 static inline int xsch(struct subchannel_id schid)
198 {
199 register struct subchannel_id reg1 asm("1") = schid;
200 int ccode;
201
202 asm volatile(
203 " .insn rre,0xb2760000,%1,0\n"
204 " ipm %0\n"
205 " srl %0,28"
206 : "=d" (ccode)
207 : "d" (reg1)
208 : "cc");
209 return ccode;
210 }
211
212 #endif
213