Commit | Line | Data |
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7eb9d5be | 1 | /* |
7eb9d5be MS |
2 | * SCLP OCF communication parameters sysfs interface |
3 | * | |
4 | * Copyright IBM Corp. 2011 | |
5 | * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com> | |
6 | */ | |
7 | ||
8 | #define KMSG_COMPONENT "sclp_ocf" | |
9 | #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt | |
10 | ||
11 | #include <linux/kernel.h> | |
12 | #include <linux/init.h> | |
13 | #include <linux/stat.h> | |
14 | #include <linux/device.h> | |
15 | #include <linux/string.h> | |
16 | #include <linux/ctype.h> | |
17 | #include <linux/kmod.h> | |
18 | #include <linux/timer.h> | |
19 | #include <linux/err.h> | |
20 | #include <asm/ebcdic.h> | |
21 | #include <asm/sclp.h> | |
22 | ||
23 | #include "sclp.h" | |
24 | ||
25 | #define OCF_LENGTH_HMC_NETWORK 8UL | |
26 | #define OCF_LENGTH_CPC_NAME 8UL | |
27 | ||
28 | static char hmc_network[OCF_LENGTH_HMC_NETWORK + 1]; | |
29 | static char cpc_name[OCF_LENGTH_CPC_NAME + 1]; | |
30 | ||
31 | static DEFINE_SPINLOCK(sclp_ocf_lock); | |
32 | static struct work_struct sclp_ocf_change_work; | |
33 | ||
34 | static struct kset *ocf_kset; | |
35 | ||
36 | static void sclp_ocf_change_notify(struct work_struct *work) | |
37 | { | |
38 | kobject_uevent(&ocf_kset->kobj, KOBJ_CHANGE); | |
39 | } | |
40 | ||
41 | /* Handler for OCF event. Look for the CPC image name. */ | |
42 | static void sclp_ocf_handler(struct evbuf_header *evbuf) | |
43 | { | |
44 | struct gds_vector *v; | |
45 | struct gds_subvector *sv, *netid, *cpc; | |
46 | size_t size; | |
47 | ||
48 | /* Find the 0x9f00 block. */ | |
49 | v = sclp_find_gds_vector(evbuf + 1, (void *) evbuf + evbuf->length, | |
50 | 0x9f00); | |
51 | if (!v) | |
52 | return; | |
53 | /* Find the 0x9f22 block inside the 0x9f00 block. */ | |
54 | v = sclp_find_gds_vector(v + 1, (void *) v + v->length, 0x9f22); | |
55 | if (!v) | |
56 | return; | |
57 | /* Find the 0x81 block inside the 0x9f22 block. */ | |
58 | sv = sclp_find_gds_subvector(v + 1, (void *) v + v->length, 0x81); | |
59 | if (!sv) | |
60 | return; | |
61 | /* Find the 0x01 block inside the 0x81 block. */ | |
62 | netid = sclp_find_gds_subvector(sv + 1, (void *) sv + sv->length, 1); | |
63 | /* Find the 0x02 block inside the 0x81 block. */ | |
64 | cpc = sclp_find_gds_subvector(sv + 1, (void *) sv + sv->length, 2); | |
65 | /* Copy network name and cpc name. */ | |
66 | spin_lock(&sclp_ocf_lock); | |
67 | if (netid) { | |
68 | size = min(OCF_LENGTH_HMC_NETWORK, (size_t) netid->length); | |
69 | memcpy(hmc_network, netid + 1, size); | |
70 | EBCASC(hmc_network, size); | |
71 | hmc_network[size] = 0; | |
72 | } | |
73 | if (cpc) { | |
74 | size = min(OCF_LENGTH_CPC_NAME, (size_t) cpc->length); | |
75 | memcpy(cpc_name, cpc + 1, size); | |
76 | EBCASC(cpc_name, size); | |
77 | cpc_name[size] = 0; | |
78 | } | |
79 | spin_unlock(&sclp_ocf_lock); | |
80 | schedule_work(&sclp_ocf_change_work); | |
81 | } | |
82 | ||
83 | static struct sclp_register sclp_ocf_event = { | |
84 | .receive_mask = EVTYP_OCF_MASK, | |
85 | .receiver_fn = sclp_ocf_handler, | |
86 | }; | |
87 | ||
88 | static ssize_t cpc_name_show(struct kobject *kobj, | |
89 | struct kobj_attribute *attr, char *page) | |
90 | { | |
91 | int rc; | |
92 | ||
93 | spin_lock_irq(&sclp_ocf_lock); | |
94 | rc = snprintf(page, PAGE_SIZE, "%s\n", cpc_name); | |
95 | spin_unlock_irq(&sclp_ocf_lock); | |
96 | return rc; | |
97 | } | |
98 | ||
99 | static struct kobj_attribute cpc_name_attr = | |
100 | __ATTR(cpc_name, 0444, cpc_name_show, NULL); | |
101 | ||
102 | static ssize_t hmc_network_show(struct kobject *kobj, | |
103 | struct kobj_attribute *attr, char *page) | |
104 | { | |
105 | int rc; | |
106 | ||
107 | spin_lock_irq(&sclp_ocf_lock); | |
108 | rc = snprintf(page, PAGE_SIZE, "%s\n", hmc_network); | |
109 | spin_unlock_irq(&sclp_ocf_lock); | |
110 | return rc; | |
111 | } | |
112 | ||
113 | static struct kobj_attribute hmc_network_attr = | |
114 | __ATTR(hmc_network, 0444, hmc_network_show, NULL); | |
115 | ||
116 | static struct attribute *ocf_attrs[] = { | |
117 | &cpc_name_attr.attr, | |
118 | &hmc_network_attr.attr, | |
119 | NULL, | |
120 | }; | |
121 | ||
122 | static struct attribute_group ocf_attr_group = { | |
123 | .attrs = ocf_attrs, | |
124 | }; | |
125 | ||
126 | static int __init ocf_init(void) | |
127 | { | |
128 | int rc; | |
129 | ||
130 | INIT_WORK(&sclp_ocf_change_work, sclp_ocf_change_notify); | |
131 | ocf_kset = kset_create_and_add("ocf", NULL, firmware_kobj); | |
132 | if (!ocf_kset) | |
133 | return -ENOMEM; | |
134 | ||
135 | rc = sysfs_create_group(&ocf_kset->kobj, &ocf_attr_group); | |
136 | if (rc) { | |
137 | kset_unregister(ocf_kset); | |
138 | return rc; | |
139 | } | |
140 | ||
141 | return sclp_register(&sclp_ocf_event); | |
142 | } | |
143 | ||
144 | device_initcall(ocf_init); |