1*4882a593Smuzhiyun // SPDX-License-Identifier: GPL-2.0
2*4882a593Smuzhiyun /*
3*4882a593Smuzhiyun * Copyright IBM Corp. 2007
4*4882a593Smuzhiyun * Author(s): Heiko Carstens <heiko.carstens@de.ibm.com>
5*4882a593Smuzhiyun */
6*4882a593Smuzhiyun
7*4882a593Smuzhiyun #define KMSG_COMPONENT "sclp_config"
8*4882a593Smuzhiyun #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
9*4882a593Smuzhiyun
10*4882a593Smuzhiyun #include <linux/init.h>
11*4882a593Smuzhiyun #include <linux/errno.h>
12*4882a593Smuzhiyun #include <linux/cpu.h>
13*4882a593Smuzhiyun #include <linux/device.h>
14*4882a593Smuzhiyun #include <linux/workqueue.h>
15*4882a593Smuzhiyun #include <linux/slab.h>
16*4882a593Smuzhiyun #include <linux/sysfs.h>
17*4882a593Smuzhiyun #include <asm/smp.h>
18*4882a593Smuzhiyun
19*4882a593Smuzhiyun #include "sclp.h"
20*4882a593Smuzhiyun
21*4882a593Smuzhiyun struct conf_mgm_data {
22*4882a593Smuzhiyun u8 reserved;
23*4882a593Smuzhiyun u8 ev_qualifier;
24*4882a593Smuzhiyun } __attribute__((packed));
25*4882a593Smuzhiyun
26*4882a593Smuzhiyun #define OFB_DATA_MAX 64
27*4882a593Smuzhiyun
28*4882a593Smuzhiyun struct sclp_ofb_evbuf {
29*4882a593Smuzhiyun struct evbuf_header header;
30*4882a593Smuzhiyun struct conf_mgm_data cm_data;
31*4882a593Smuzhiyun char ev_data[OFB_DATA_MAX];
32*4882a593Smuzhiyun } __packed;
33*4882a593Smuzhiyun
34*4882a593Smuzhiyun struct sclp_ofb_sccb {
35*4882a593Smuzhiyun struct sccb_header header;
36*4882a593Smuzhiyun struct sclp_ofb_evbuf ofb_evbuf;
37*4882a593Smuzhiyun } __packed;
38*4882a593Smuzhiyun
39*4882a593Smuzhiyun #define EV_QUAL_CPU_CHANGE 1
40*4882a593Smuzhiyun #define EV_QUAL_CAP_CHANGE 3
41*4882a593Smuzhiyun #define EV_QUAL_OPEN4BUSINESS 5
42*4882a593Smuzhiyun
43*4882a593Smuzhiyun static struct work_struct sclp_cpu_capability_work;
44*4882a593Smuzhiyun static struct work_struct sclp_cpu_change_work;
45*4882a593Smuzhiyun
sclp_cpu_capability_notify(struct work_struct * work)46*4882a593Smuzhiyun static void sclp_cpu_capability_notify(struct work_struct *work)
47*4882a593Smuzhiyun {
48*4882a593Smuzhiyun int cpu;
49*4882a593Smuzhiyun struct device *dev;
50*4882a593Smuzhiyun
51*4882a593Smuzhiyun s390_update_cpu_mhz();
52*4882a593Smuzhiyun pr_info("CPU capability may have changed\n");
53*4882a593Smuzhiyun get_online_cpus();
54*4882a593Smuzhiyun for_each_online_cpu(cpu) {
55*4882a593Smuzhiyun dev = get_cpu_device(cpu);
56*4882a593Smuzhiyun kobject_uevent(&dev->kobj, KOBJ_CHANGE);
57*4882a593Smuzhiyun }
58*4882a593Smuzhiyun put_online_cpus();
59*4882a593Smuzhiyun }
60*4882a593Smuzhiyun
sclp_cpu_change_notify(struct work_struct * work)61*4882a593Smuzhiyun static void __ref sclp_cpu_change_notify(struct work_struct *work)
62*4882a593Smuzhiyun {
63*4882a593Smuzhiyun lock_device_hotplug();
64*4882a593Smuzhiyun smp_rescan_cpus();
65*4882a593Smuzhiyun unlock_device_hotplug();
66*4882a593Smuzhiyun }
67*4882a593Smuzhiyun
sclp_conf_receiver_fn(struct evbuf_header * evbuf)68*4882a593Smuzhiyun static void sclp_conf_receiver_fn(struct evbuf_header *evbuf)
69*4882a593Smuzhiyun {
70*4882a593Smuzhiyun struct conf_mgm_data *cdata;
71*4882a593Smuzhiyun
72*4882a593Smuzhiyun cdata = (struct conf_mgm_data *)(evbuf + 1);
73*4882a593Smuzhiyun switch (cdata->ev_qualifier) {
74*4882a593Smuzhiyun case EV_QUAL_CPU_CHANGE:
75*4882a593Smuzhiyun schedule_work(&sclp_cpu_change_work);
76*4882a593Smuzhiyun break;
77*4882a593Smuzhiyun case EV_QUAL_CAP_CHANGE:
78*4882a593Smuzhiyun schedule_work(&sclp_cpu_capability_work);
79*4882a593Smuzhiyun break;
80*4882a593Smuzhiyun }
81*4882a593Smuzhiyun }
82*4882a593Smuzhiyun
83*4882a593Smuzhiyun static struct sclp_register sclp_conf_register =
84*4882a593Smuzhiyun {
85*4882a593Smuzhiyun #ifdef CONFIG_SCLP_OFB
86*4882a593Smuzhiyun .send_mask = EVTYP_CONFMGMDATA_MASK,
87*4882a593Smuzhiyun #endif
88*4882a593Smuzhiyun .receive_mask = EVTYP_CONFMGMDATA_MASK,
89*4882a593Smuzhiyun .receiver_fn = sclp_conf_receiver_fn,
90*4882a593Smuzhiyun };
91*4882a593Smuzhiyun
92*4882a593Smuzhiyun #ifdef CONFIG_SCLP_OFB
sclp_ofb_send_req(char * ev_data,size_t len)93*4882a593Smuzhiyun static int sclp_ofb_send_req(char *ev_data, size_t len)
94*4882a593Smuzhiyun {
95*4882a593Smuzhiyun static DEFINE_MUTEX(send_mutex);
96*4882a593Smuzhiyun struct sclp_ofb_sccb *sccb;
97*4882a593Smuzhiyun int rc, response;
98*4882a593Smuzhiyun
99*4882a593Smuzhiyun if (len > OFB_DATA_MAX)
100*4882a593Smuzhiyun return -EINVAL;
101*4882a593Smuzhiyun sccb = (struct sclp_ofb_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
102*4882a593Smuzhiyun if (!sccb)
103*4882a593Smuzhiyun return -ENOMEM;
104*4882a593Smuzhiyun /* Setup SCCB for Control-Program Identification */
105*4882a593Smuzhiyun sccb->header.length = sizeof(struct sclp_ofb_sccb);
106*4882a593Smuzhiyun sccb->ofb_evbuf.header.length = sizeof(struct sclp_ofb_evbuf);
107*4882a593Smuzhiyun sccb->ofb_evbuf.header.type = EVTYP_CONFMGMDATA;
108*4882a593Smuzhiyun sccb->ofb_evbuf.cm_data.ev_qualifier = EV_QUAL_OPEN4BUSINESS;
109*4882a593Smuzhiyun memcpy(sccb->ofb_evbuf.ev_data, ev_data, len);
110*4882a593Smuzhiyun
111*4882a593Smuzhiyun if (!(sclp_conf_register.sclp_receive_mask & EVTYP_CONFMGMDATA_MASK))
112*4882a593Smuzhiyun pr_warn("SCLP receiver did not register to receive "
113*4882a593Smuzhiyun "Configuration Management Data Events.\n");
114*4882a593Smuzhiyun
115*4882a593Smuzhiyun mutex_lock(&send_mutex);
116*4882a593Smuzhiyun rc = sclp_sync_request(SCLP_CMDW_WRITE_EVENT_DATA, sccb);
117*4882a593Smuzhiyun mutex_unlock(&send_mutex);
118*4882a593Smuzhiyun if (rc)
119*4882a593Smuzhiyun goto out;
120*4882a593Smuzhiyun response = sccb->header.response_code;
121*4882a593Smuzhiyun if (response != 0x0020) {
122*4882a593Smuzhiyun pr_err("Open for Business request failed with response code "
123*4882a593Smuzhiyun "0x%04x\n", response);
124*4882a593Smuzhiyun rc = -EIO;
125*4882a593Smuzhiyun }
126*4882a593Smuzhiyun out:
127*4882a593Smuzhiyun free_page((unsigned long)sccb);
128*4882a593Smuzhiyun return rc;
129*4882a593Smuzhiyun }
130*4882a593Smuzhiyun
sysfs_ofb_data_write(struct file * filp,struct kobject * kobj,struct bin_attribute * bin_attr,char * buf,loff_t off,size_t count)131*4882a593Smuzhiyun static ssize_t sysfs_ofb_data_write(struct file *filp, struct kobject *kobj,
132*4882a593Smuzhiyun struct bin_attribute *bin_attr,
133*4882a593Smuzhiyun char *buf, loff_t off, size_t count)
134*4882a593Smuzhiyun {
135*4882a593Smuzhiyun int rc;
136*4882a593Smuzhiyun
137*4882a593Smuzhiyun rc = sclp_ofb_send_req(buf, count);
138*4882a593Smuzhiyun return rc ?: count;
139*4882a593Smuzhiyun }
140*4882a593Smuzhiyun
141*4882a593Smuzhiyun static const struct bin_attribute ofb_bin_attr = {
142*4882a593Smuzhiyun .attr = {
143*4882a593Smuzhiyun .name = "event_data",
144*4882a593Smuzhiyun .mode = S_IWUSR,
145*4882a593Smuzhiyun },
146*4882a593Smuzhiyun .write = sysfs_ofb_data_write,
147*4882a593Smuzhiyun };
148*4882a593Smuzhiyun #endif
149*4882a593Smuzhiyun
sclp_ofb_setup(void)150*4882a593Smuzhiyun static int __init sclp_ofb_setup(void)
151*4882a593Smuzhiyun {
152*4882a593Smuzhiyun #ifdef CONFIG_SCLP_OFB
153*4882a593Smuzhiyun struct kset *ofb_kset;
154*4882a593Smuzhiyun int rc;
155*4882a593Smuzhiyun
156*4882a593Smuzhiyun ofb_kset = kset_create_and_add("ofb", NULL, firmware_kobj);
157*4882a593Smuzhiyun if (!ofb_kset)
158*4882a593Smuzhiyun return -ENOMEM;
159*4882a593Smuzhiyun rc = sysfs_create_bin_file(&ofb_kset->kobj, &ofb_bin_attr);
160*4882a593Smuzhiyun if (rc) {
161*4882a593Smuzhiyun kset_unregister(ofb_kset);
162*4882a593Smuzhiyun return rc;
163*4882a593Smuzhiyun }
164*4882a593Smuzhiyun #endif
165*4882a593Smuzhiyun return 0;
166*4882a593Smuzhiyun }
167*4882a593Smuzhiyun
sclp_conf_init(void)168*4882a593Smuzhiyun static int __init sclp_conf_init(void)
169*4882a593Smuzhiyun {
170*4882a593Smuzhiyun int rc;
171*4882a593Smuzhiyun
172*4882a593Smuzhiyun INIT_WORK(&sclp_cpu_capability_work, sclp_cpu_capability_notify);
173*4882a593Smuzhiyun INIT_WORK(&sclp_cpu_change_work, sclp_cpu_change_notify);
174*4882a593Smuzhiyun rc = sclp_register(&sclp_conf_register);
175*4882a593Smuzhiyun if (rc)
176*4882a593Smuzhiyun return rc;
177*4882a593Smuzhiyun return sclp_ofb_setup();
178*4882a593Smuzhiyun }
179*4882a593Smuzhiyun
180*4882a593Smuzhiyun __initcall(sclp_conf_init);
181