blob: 2553db0fdb5285965df26f1c62d903415c0068fb [file] [log] [blame]
Martin Schwidefsky7eb9d5b2011-05-23 10:24:43 +02001/*
Martin Schwidefsky7eb9d5b2011-05-23 10:24:43 +02002 * 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
28static char hmc_network[OCF_LENGTH_HMC_NETWORK + 1];
29static char cpc_name[OCF_LENGTH_CPC_NAME + 1];
30
31static DEFINE_SPINLOCK(sclp_ocf_lock);
32static struct work_struct sclp_ocf_change_work;
33
34static struct kset *ocf_kset;
35
36static 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. */
42static 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
83static struct sclp_register sclp_ocf_event = {
84 .receive_mask = EVTYP_OCF_MASK,
85 .receiver_fn = sclp_ocf_handler,
86};
87
88static 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
99static struct kobj_attribute cpc_name_attr =
100 __ATTR(cpc_name, 0444, cpc_name_show, NULL);
101
102static 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
113static struct kobj_attribute hmc_network_attr =
114 __ATTR(hmc_network, 0444, hmc_network_show, NULL);
115
116static struct attribute *ocf_attrs[] = {
117 &cpc_name_attr.attr,
118 &hmc_network_attr.attr,
119 NULL,
120};
121
122static struct attribute_group ocf_attr_group = {
123 .attrs = ocf_attrs,
124};
125
126static 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
144device_initcall(ocf_init);