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_dma_area { |
13 | struct ccw1 sense_ccw; /* static ccw for sense command */ |
14 | }; |
15 | |
16 | struct io_subchannel_private { |
17 | union orb orb; /* operation request block */ |
18 | struct ccw_device *cdev;/* pointer to the child ccw device */ |
19 | struct { |
20 | unsigned int suspend:1; /* allow suspend */ |
21 | unsigned int prefetch:1;/* deny prefetch */ |
22 | unsigned int inter:1; /* suppress intermediate interrupts */ |
23 | } __packed options; |
24 | struct io_subchannel_dma_area *dma_area; |
25 | dma_addr_t dma_area_dma; |
26 | } __aligned(8); |
27 | |
28 | #define to_io_private(n) ((struct io_subchannel_private *) \ |
29 | dev_get_drvdata(&(n)->dev)) |
30 | #define set_io_private(n, p) (dev_set_drvdata(&(n)->dev, p)) |
31 | |
32 | static inline struct ccw_device *sch_get_cdev(struct subchannel *sch) |
33 | { |
34 | struct io_subchannel_private *priv = to_io_private(sch); |
35 | return priv ? priv->cdev : NULL; |
36 | } |
37 | |
38 | static inline void sch_set_cdev(struct subchannel *sch, |
39 | struct ccw_device *cdev) |
40 | { |
41 | struct io_subchannel_private *priv = to_io_private(sch); |
42 | if (priv) |
43 | priv->cdev = cdev; |
44 | } |
45 | |
46 | #define MAX_CIWS 8 |
47 | |
48 | /* |
49 | * Possible status values for a CCW request's I/O. |
50 | */ |
51 | enum io_status { |
52 | IO_DONE, |
53 | IO_RUNNING, |
54 | IO_STATUS_ERROR, |
55 | IO_PATH_ERROR, |
56 | IO_REJECTED, |
57 | IO_KILLED |
58 | }; |
59 | |
60 | /** |
61 | * ccw_request - Internal CCW request. |
62 | * @cp: channel program to start |
63 | * @timeout: maximum allowable time in jiffies between start I/O and interrupt |
64 | * @maxretries: number of retries per I/O operation and path |
65 | * @lpm: mask of paths to use |
66 | * @check: optional callback that determines if results are final |
67 | * @filter: optional callback to adjust request status based on IRB data |
68 | * @callback: final callback |
69 | * @data: user-defined pointer passed to all callbacks |
70 | * @singlepath: if set, use only one path from @lpm per start I/O |
71 | * @cancel: non-zero if request was cancelled |
72 | * @done: non-zero if request was finished |
73 | * @mask: current path mask |
74 | * @retries: current number of retries |
75 | * @drc: delayed return code |
76 | */ |
77 | struct ccw_request { |
78 | struct ccw1 *cp; |
79 | unsigned long timeout; |
80 | u16 maxretries; |
81 | u8 lpm; |
82 | int (*check)(struct ccw_device *, void *); |
83 | enum io_status (*filter)(struct ccw_device *, void *, struct irb *, |
84 | enum io_status); |
85 | void (*callback)(struct ccw_device *, void *, int); |
86 | void *data; |
87 | unsigned int singlepath:1; |
88 | /* These fields are used internally. */ |
89 | unsigned int cancel:1; |
90 | unsigned int done:1; |
91 | u16 mask; |
92 | u16 retries; |
93 | int drc; |
94 | } __attribute__((packed)); |
95 | |
96 | /* |
97 | * sense-id response buffer layout |
98 | */ |
99 | struct senseid { |
100 | /* common part */ |
101 | u8 reserved; /* always 0x'FF' */ |
102 | u16 cu_type; /* control unit type */ |
103 | u8 cu_model; /* control unit model */ |
104 | u16 dev_type; /* device type */ |
105 | u8 dev_model; /* device model */ |
106 | u8 unused; /* padding byte */ |
107 | /* extended part */ |
108 | struct ciw ciw[MAX_CIWS]; /* variable # of CIWs */ |
109 | } __attribute__ ((packed, aligned(4))); |
110 | |
111 | enum cdev_todo { |
112 | CDEV_TODO_NOTHING, |
113 | CDEV_TODO_ENABLE_CMF, |
114 | CDEV_TODO_REBIND, |
115 | CDEV_TODO_REGISTER, |
116 | CDEV_TODO_UNREG, |
117 | CDEV_TODO_UNREG_EVAL, |
118 | }; |
119 | |
120 | #define FAKE_CMD_IRB 1 |
121 | #define FAKE_TM_IRB 2 |
122 | |
123 | struct ccw_device_dma_area { |
124 | struct senseid senseid; /* SenseID info */ |
125 | struct ccw1 iccws[2]; /* ccws for SNID/SID/SPGID commands */ |
126 | struct irb irb; /* device status */ |
127 | struct pgid pgid[8]; /* path group IDs per chpid*/ |
128 | }; |
129 | |
130 | struct ccw_device_private { |
131 | struct ccw_device *cdev; |
132 | struct subchannel *sch; |
133 | int state; /* device state */ |
134 | atomic_t onoff; |
135 | struct ccw_dev_id dev_id; /* device id */ |
136 | struct ccw_request req; /* internal I/O request */ |
137 | int iretry; |
138 | u8 pgid_valid_mask; /* mask of valid PGIDs */ |
139 | u8 pgid_todo_mask; /* mask of PGIDs to be adjusted */ |
140 | u8 pgid_reset_mask; /* mask of PGIDs which were reset */ |
141 | u8 path_noirq_mask; /* mask of paths for which no irq was |
142 | received */ |
143 | u8 path_notoper_mask; /* mask of paths which were found |
144 | not operable */ |
145 | u8 path_gone_mask; /* mask of paths, that became unavailable */ |
146 | u8 path_new_mask; /* mask of paths, that became available */ |
147 | u8 path_broken_mask; /* mask of paths, which were found to be |
148 | unusable */ |
149 | struct { |
150 | unsigned int fast:1; /* post with "channel end" */ |
151 | unsigned int repall:1; /* report every interrupt status */ |
152 | unsigned int pgroup:1; /* do path grouping */ |
153 | unsigned int force:1; /* allow forced online */ |
154 | unsigned int mpath:1; /* do multipathing */ |
155 | } __attribute__ ((packed)) options; |
156 | struct { |
157 | unsigned int esid:1; /* Ext. SenseID supported by HW */ |
158 | unsigned int dosense:1; /* delayed SENSE required */ |
159 | unsigned int doverify:1; /* delayed path verification */ |
160 | unsigned int donotify:1; /* call notify function */ |
161 | unsigned int recog_done:1; /* dev. recog. complete */ |
162 | unsigned int fake_irb:2; /* deliver faked irb */ |
163 | unsigned int pgroup:1; /* pathgroup is set up */ |
164 | unsigned int mpath:1; /* multipathing is set up */ |
165 | unsigned int pgid_unknown:1;/* unknown pgid state */ |
166 | unsigned int initialized:1; /* set if initial reference held */ |
167 | } __attribute__((packed)) flags; |
168 | unsigned long intparm; /* user interruption parameter */ |
169 | struct qdio_irq *qdio_data; |
170 | int async_kill_io_rc; |
171 | struct work_struct todo_work; |
172 | enum cdev_todo todo; |
173 | wait_queue_head_t wait_q; |
174 | struct timer_list timer; |
175 | void *cmb; /* measurement information */ |
176 | struct list_head cmb_list; /* list of measured devices */ |
177 | u64 cmb_start_time; /* clock value of cmb reset */ |
178 | void *cmb_wait; /* deferred cmb enable/disable */ |
179 | struct gen_pool *dma_pool; |
180 | struct ccw_device_dma_area *dma_area; |
181 | enum interruption_class int_class; |
182 | }; |
183 | |
184 | #endif |
185 | |