1 /* SPDX-License-Identifier: GPL-2.0 */
2 #ifndef S390_IO_SCH_H
3 #define S390_IO_SCH_H
4 
5 #include <linux/types.h>
6 #include <asm/schid.h>
7 #include <asm/ccwdev.h>
8 #include <asm/irq.h>
9 #include "css.h"
10 #include "orb.h"
11 
12 struct io_subchannel_private {
13 	union orb orb;		/* operation request block */
14 	struct ccw1 sense_ccw;	/* static ccw for sense command */
15 	struct ccw_device *cdev;/* pointer to the child ccw device */
16 	struct {
17 		unsigned int suspend:1;	/* allow suspend */
18 		unsigned int prefetch:1;/* deny prefetch */
19 		unsigned int inter:1;	/* suppress intermediate interrupts */
20 	} __packed options;
21 } __aligned(8);
22 
23 #define to_io_private(n) ((struct io_subchannel_private *) \
24 			  dev_get_drvdata(&(n)->dev))
25 #define set_io_private(n, p) (dev_set_drvdata(&(n)->dev, p))
26 
sch_get_cdev(struct subchannel * sch)27 static inline struct ccw_device *sch_get_cdev(struct subchannel *sch)
28 {
29 	struct io_subchannel_private *priv = to_io_private(sch);
30 	return priv ? priv->cdev : NULL;
31 }
32 
sch_set_cdev(struct subchannel * sch,struct ccw_device * cdev)33 static inline void sch_set_cdev(struct subchannel *sch,
34 				struct ccw_device *cdev)
35 {
36 	struct io_subchannel_private *priv = to_io_private(sch);
37 	if (priv)
38 		priv->cdev = cdev;
39 }
40 
41 #define MAX_CIWS 8
42 
43 /*
44  * Possible status values for a CCW request's I/O.
45  */
46 enum io_status {
47 	IO_DONE,
48 	IO_RUNNING,
49 	IO_STATUS_ERROR,
50 	IO_PATH_ERROR,
51 	IO_REJECTED,
52 	IO_KILLED
53 };
54 
55 /**
56  * ccw_request - Internal CCW request.
57  * @cp: channel program to start
58  * @timeout: maximum allowable time in jiffies between start I/O and interrupt
59  * @maxretries: number of retries per I/O operation and path
60  * @lpm: mask of paths to use
61  * @check: optional callback that determines if results are final
62  * @filter: optional callback to adjust request status based on IRB data
63  * @callback: final callback
64  * @data: user-defined pointer passed to all callbacks
65  * @singlepath: if set, use only one path from @lpm per start I/O
66  * @cancel: non-zero if request was cancelled
67  * @done: non-zero if request was finished
68  * @mask: current path mask
69  * @retries: current number of retries
70  * @drc: delayed return code
71  */
72 struct ccw_request {
73 	struct ccw1 *cp;
74 	unsigned long timeout;
75 	u16 maxretries;
76 	u8 lpm;
77 	int (*check)(struct ccw_device *, void *);
78 	enum io_status (*filter)(struct ccw_device *, void *, struct irb *,
79 				 enum io_status);
80 	void (*callback)(struct ccw_device *, void *, int);
81 	void *data;
82 	unsigned int singlepath:1;
83 	/* These fields are used internally. */
84 	unsigned int cancel:1;
85 	unsigned int done:1;
86 	u16 mask;
87 	u16 retries;
88 	int drc;
89 } __attribute__((packed));
90 
91 /*
92  * sense-id response buffer layout
93  */
94 struct senseid {
95 	/* common part */
96 	u8  reserved;	/* always 0x'FF' */
97 	u16 cu_type;	/* control unit type */
98 	u8  cu_model;	/* control unit model */
99 	u16 dev_type;	/* device type */
100 	u8  dev_model;	/* device model */
101 	u8  unused;	/* padding byte */
102 	/* extended part */
103 	struct ciw ciw[MAX_CIWS];	/* variable # of CIWs */
104 }  __attribute__ ((packed, aligned(4)));
105 
106 enum cdev_todo {
107 	CDEV_TODO_NOTHING,
108 	CDEV_TODO_ENABLE_CMF,
109 	CDEV_TODO_REBIND,
110 	CDEV_TODO_REGISTER,
111 	CDEV_TODO_UNREG,
112 	CDEV_TODO_UNREG_EVAL,
113 };
114 
115 #define FAKE_CMD_IRB	1
116 #define FAKE_TM_IRB	2
117 
118 struct ccw_device_private {
119 	struct ccw_device *cdev;
120 	struct subchannel *sch;
121 	int state;		/* device state */
122 	atomic_t onoff;
123 	struct ccw_dev_id dev_id;	/* device id */
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_noirq_mask;	/* mask of paths for which no irq was
130 				   received */
131 	u8 path_notoper_mask;	/* mask of paths which were found
132 				   not operable */
133 	u8 path_gone_mask;	/* mask of paths, that became unavailable */
134 	u8 path_new_mask;	/* mask of paths, that became available */
135 	u8 path_broken_mask;	/* mask of paths, which were found to be
136 				   unusable */
137 	struct {
138 		unsigned int fast:1;	/* post with "channel end" */
139 		unsigned int repall:1;	/* report every interrupt status */
140 		unsigned int pgroup:1;	/* do path grouping */
141 		unsigned int force:1;	/* allow forced online */
142 		unsigned int mpath:1;	/* do multipathing */
143 	} __attribute__ ((packed)) options;
144 	struct {
145 		unsigned int esid:1;	    /* Ext. SenseID supported by HW */
146 		unsigned int dosense:1;	    /* delayed SENSE required */
147 		unsigned int doverify:1;    /* delayed path verification */
148 		unsigned int donotify:1;    /* call notify function */
149 		unsigned int recog_done:1;  /* dev. recog. complete */
150 		unsigned int fake_irb:2;    /* deliver faked irb */
151 		unsigned int resuming:1;    /* recognition while resume */
152 		unsigned int pgroup:1;	    /* pathgroup is set up */
153 		unsigned int mpath:1;	    /* multipathing is set up */
154 		unsigned int pgid_unknown:1;/* unknown pgid state */
155 		unsigned int initialized:1; /* set if initial reference held */
156 	} __attribute__((packed)) flags;
157 	unsigned long intparm;	/* user interruption parameter */
158 	struct qdio_irq *qdio_data;
159 	struct irb irb;		/* device status */
160 	int async_kill_io_rc;
161 	struct senseid senseid;	/* SenseID info */
162 	struct pgid pgid[8];	/* path group IDs per chpid*/
163 	struct ccw1 iccws[2];	/* ccws for SNID/SID/SPGID commands */
164 	struct work_struct todo_work;
165 	enum cdev_todo todo;
166 	wait_queue_head_t wait_q;
167 	struct timer_list timer;
168 	void *cmb;			/* measurement information */
169 	struct list_head cmb_list;	/* list of measured devices */
170 	u64 cmb_start_time;		/* clock value of cmb reset */
171 	void *cmb_wait;			/* deferred cmb enable/disable */
172 	enum interruption_class int_class;
173 };
174 
175 #endif
176