2 * drivers/s390/char/sclp_ocf.c
3 * SCLP OCF communication parameters sysfs interface
5 * Copyright IBM Corp. 2011
6 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
9 #define KMSG_COMPONENT "sclp_ocf"
10 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
12 #include <linux/kernel.h>
13 #include <linux/init.h>
14 #include <linux/stat.h>
15 #include <linux/device.h>
16 #include <linux/string.h>
17 #include <linux/ctype.h>
18 #include <linux/kmod.h>
19 #include <linux/timer.h>
20 #include <linux/err.h>
21 #include <asm/ebcdic.h>
26 #define OCF_LENGTH_HMC_NETWORK 8UL
27 #define OCF_LENGTH_CPC_NAME 8UL
29 static char hmc_network[OCF_LENGTH_HMC_NETWORK + 1];
30 static char cpc_name[OCF_LENGTH_CPC_NAME + 1];
32 static DEFINE_SPINLOCK(sclp_ocf_lock);
33 static struct work_struct sclp_ocf_change_work;
35 static struct kset *ocf_kset;
37 static void sclp_ocf_change_notify(struct work_struct *work)
39 kobject_uevent(&ocf_kset->kobj, KOBJ_CHANGE);
42 /* Handler for OCF event. Look for the CPC image name. */
43 static void sclp_ocf_handler(struct evbuf_header *evbuf)
46 struct gds_subvector *sv, *netid, *cpc;
49 /* Find the 0x9f00 block. */
50 v = sclp_find_gds_vector(evbuf + 1, (void *) evbuf + evbuf->length,
54 /* Find the 0x9f22 block inside the 0x9f00 block. */
55 v = sclp_find_gds_vector(v + 1, (void *) v + v->length, 0x9f22);
58 /* Find the 0x81 block inside the 0x9f22 block. */
59 sv = sclp_find_gds_subvector(v + 1, (void *) v + v->length, 0x81);
62 /* Find the 0x01 block inside the 0x81 block. */
63 netid = sclp_find_gds_subvector(sv + 1, (void *) sv + sv->length, 1);
64 /* Find the 0x02 block inside the 0x81 block. */
65 cpc = sclp_find_gds_subvector(sv + 1, (void *) sv + sv->length, 2);
66 /* Copy network name and cpc name. */
67 spin_lock(&sclp_ocf_lock);
69 size = min(OCF_LENGTH_HMC_NETWORK, (size_t) netid->length);
70 memcpy(hmc_network, netid + 1, size);
71 EBCASC(hmc_network, size);
72 hmc_network[size] = 0;
75 size = min(OCF_LENGTH_CPC_NAME, (size_t) cpc->length);
76 memcpy(cpc_name, cpc + 1, size);
77 EBCASC(cpc_name, size);
80 spin_unlock(&sclp_ocf_lock);
81 schedule_work(&sclp_ocf_change_work);
84 static struct sclp_register sclp_ocf_event = {
85 .receive_mask = EVTYP_OCF_MASK,
86 .receiver_fn = sclp_ocf_handler,
89 static ssize_t cpc_name_show(struct kobject *kobj,
90 struct kobj_attribute *attr, char *page)
94 spin_lock_irq(&sclp_ocf_lock);
95 rc = snprintf(page, PAGE_SIZE, "%s\n", cpc_name);
96 spin_unlock_irq(&sclp_ocf_lock);
100 static struct kobj_attribute cpc_name_attr =
101 __ATTR(cpc_name, 0444, cpc_name_show, NULL);
103 static ssize_t hmc_network_show(struct kobject *kobj,
104 struct kobj_attribute *attr, char *page)
108 spin_lock_irq(&sclp_ocf_lock);
109 rc = snprintf(page, PAGE_SIZE, "%s\n", hmc_network);
110 spin_unlock_irq(&sclp_ocf_lock);
114 static struct kobj_attribute hmc_network_attr =
115 __ATTR(hmc_network, 0444, hmc_network_show, NULL);
117 static struct attribute *ocf_attrs[] = {
119 &hmc_network_attr.attr,
123 static struct attribute_group ocf_attr_group = {
127 static int __init ocf_init(void)
131 INIT_WORK(&sclp_ocf_change_work, sclp_ocf_change_notify);
132 ocf_kset = kset_create_and_add("ocf", NULL, firmware_kobj);
136 rc = sysfs_create_group(&ocf_kset->kobj, &ocf_attr_group);
138 kset_unregister(ocf_kset);
142 return sclp_register(&sclp_ocf_event);
145 device_initcall(ocf_init);