1 /* SPDX-License-Identifier: GPL-2.0 */
2 /*
3  *    Copyright IBM Corp. 2007, 2010
4  *    Author(s): Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
5  */
6 
7 #ifndef S390_CHP_H
8 #define S390_CHP_H
9 
10 #include <linux/types.h>
11 #include <linux/device.h>
12 #include <linux/mutex.h>
13 #include <asm/chpid.h>
14 #include "chsc.h"
15 #include "css.h"
16 
17 #define CHP_STATUS_STANDBY		0
18 #define CHP_STATUS_CONFIGURED		1
19 #define CHP_STATUS_RESERVED		2
20 #define CHP_STATUS_NOT_RECOGNIZED	3
21 
22 #define CHP_ONLINE 0
23 #define CHP_OFFLINE 1
24 #define CHP_VARY_ON 2
25 #define CHP_VARY_OFF 3
26 
27 struct chp_link {
28 	struct chp_id chpid;
29 	u32 fla_mask;
30 	u16 fla;
31 };
32 
chp_test_bit(u8 * bitmap,int num)33 static inline int chp_test_bit(u8 *bitmap, int num)
34 {
35 	int byte = num >> 3;
36 	int mask = 128 >> (num & 7);
37 
38 	return (bitmap[byte] & mask) ? 1 : 0;
39 }
40 
41 
42 struct channel_path {
43 	struct device dev;
44 	struct chp_id chpid;
45 	struct mutex lock; /* Serialize access to below members. */
46 	int state;
47 	struct channel_path_desc_fmt0 desc;
48 	struct channel_path_desc_fmt1 desc_fmt1;
49 	struct channel_path_desc_fmt3 desc_fmt3;
50 	/* Channel-measurement related stuff: */
51 	int cmg;
52 	int shared;
53 	struct cmg_chars cmg_chars;
54 };
55 
56 /* Return channel_path struct for given chpid. */
chpid_to_chp(struct chp_id chpid)57 static inline struct channel_path *chpid_to_chp(struct chp_id chpid)
58 {
59 	return css_by_id(chpid.cssid)->chps[chpid.id];
60 }
61 
62 int chp_get_status(struct chp_id chpid);
63 u8 chp_get_sch_opm(struct subchannel *sch);
64 int chp_is_registered(struct chp_id chpid);
65 struct channel_path_desc_fmt0 *chp_get_chp_desc(struct chp_id chpid);
66 void chp_remove_cmg_attr(struct channel_path *chp);
67 int chp_add_cmg_attr(struct channel_path *chp);
68 int chp_update_desc(struct channel_path *chp);
69 int chp_new(struct chp_id chpid);
70 void chp_cfg_schedule(struct chp_id chpid, int configure);
71 void chp_cfg_cancel_deconfigure(struct chp_id chpid);
72 int chp_info_get_status(struct chp_id chpid);
73 int chp_ssd_get_mask(struct chsc_ssd_info *, struct chp_link *);
74 #endif /* S390_CHP_H */
75