1 /*
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]; /* in EBCDIC */
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
sclp_ocf_change_notify(struct work_struct * work)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. */
sclp_ocf_handler(struct evbuf_header * evbuf)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 memset(cpc_name, 0, OCF_LENGTH_CPC_NAME);
76 memcpy(cpc_name, cpc + 1, size);
77 }
78 spin_unlock(&sclp_ocf_lock);
79 schedule_work(&sclp_ocf_change_work);
80 }
81
82 static struct sclp_register sclp_ocf_event = {
83 .receive_mask = EVTYP_OCF_MASK,
84 .receiver_fn = sclp_ocf_handler,
85 };
86
sclp_ocf_cpc_name_copy(char * dst)87 void sclp_ocf_cpc_name_copy(char *dst)
88 {
89 spin_lock_irq(&sclp_ocf_lock);
90 memcpy(dst, cpc_name, OCF_LENGTH_CPC_NAME);
91 spin_unlock_irq(&sclp_ocf_lock);
92 }
93 EXPORT_SYMBOL(sclp_ocf_cpc_name_copy);
94
cpc_name_show(struct kobject * kobj,struct kobj_attribute * attr,char * page)95 static ssize_t cpc_name_show(struct kobject *kobj,
96 struct kobj_attribute *attr, char *page)
97 {
98 char name[OCF_LENGTH_CPC_NAME + 1];
99
100 sclp_ocf_cpc_name_copy(name);
101 name[OCF_LENGTH_CPC_NAME] = 0;
102 EBCASC(name, OCF_LENGTH_CPC_NAME);
103 return snprintf(page, PAGE_SIZE, "%s\n", name);
104 }
105
106 static struct kobj_attribute cpc_name_attr =
107 __ATTR(cpc_name, 0444, cpc_name_show, NULL);
108
hmc_network_show(struct kobject * kobj,struct kobj_attribute * attr,char * page)109 static ssize_t hmc_network_show(struct kobject *kobj,
110 struct kobj_attribute *attr, char *page)
111 {
112 int rc;
113
114 spin_lock_irq(&sclp_ocf_lock);
115 rc = snprintf(page, PAGE_SIZE, "%s\n", hmc_network);
116 spin_unlock_irq(&sclp_ocf_lock);
117 return rc;
118 }
119
120 static struct kobj_attribute hmc_network_attr =
121 __ATTR(hmc_network, 0444, hmc_network_show, NULL);
122
123 static struct attribute *ocf_attrs[] = {
124 &cpc_name_attr.attr,
125 &hmc_network_attr.attr,
126 NULL,
127 };
128
129 static struct attribute_group ocf_attr_group = {
130 .attrs = ocf_attrs,
131 };
132
ocf_init(void)133 static int __init ocf_init(void)
134 {
135 int rc;
136
137 INIT_WORK(&sclp_ocf_change_work, sclp_ocf_change_notify);
138 ocf_kset = kset_create_and_add("ocf", NULL, firmware_kobj);
139 if (!ocf_kset)
140 return -ENOMEM;
141
142 rc = sysfs_create_group(&ocf_kset->kobj, &ocf_attr_group);
143 if (rc) {
144 kset_unregister(ocf_kset);
145 return rc;
146 }
147
148 return sclp_register(&sclp_ocf_event);
149 }
150
151 device_initcall(ocf_init);
152