153 lines
3.8 KiB
C
153 lines
3.8 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* SCLP OCF communication parameters sysfs interface
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*
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* Copyright IBM Corp. 2011
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* Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
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*/
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#define KMSG_COMPONENT "sclp_ocf"
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#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
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#include <linux/kernel.h>
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#include <linux/init.h>
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#include <linux/stat.h>
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#include <linux/device.h>
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#include <linux/string.h>
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#include <linux/ctype.h>
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#include <linux/kmod.h>
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#include <linux/timer.h>
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#include <linux/err.h>
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#include <asm/ebcdic.h>
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#include <asm/sclp.h>
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#include "sclp.h"
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#define OCF_LENGTH_HMC_NETWORK 8UL
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#define OCF_LENGTH_CPC_NAME 8UL
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static char hmc_network[OCF_LENGTH_HMC_NETWORK + 1];
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static char cpc_name[OCF_LENGTH_CPC_NAME]; /* in EBCDIC */
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static DEFINE_SPINLOCK(sclp_ocf_lock);
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static struct work_struct sclp_ocf_change_work;
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static struct kset *ocf_kset;
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static void sclp_ocf_change_notify(struct work_struct *work)
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{
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kobject_uevent(&ocf_kset->kobj, KOBJ_CHANGE);
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}
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/* Handler for OCF event. Look for the CPC image name. */
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static void sclp_ocf_handler(struct evbuf_header *evbuf)
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{
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struct gds_vector *v;
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struct gds_subvector *sv, *netid, *cpc;
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size_t size;
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/* Find the 0x9f00 block. */
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v = sclp_find_gds_vector(evbuf + 1, (void *) evbuf + evbuf->length,
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0x9f00);
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if (!v)
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return;
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/* Find the 0x9f22 block inside the 0x9f00 block. */
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v = sclp_find_gds_vector(v + 1, (void *) v + v->length, 0x9f22);
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if (!v)
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return;
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/* Find the 0x81 block inside the 0x9f22 block. */
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sv = sclp_find_gds_subvector(v + 1, (void *) v + v->length, 0x81);
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if (!sv)
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return;
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/* Find the 0x01 block inside the 0x81 block. */
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netid = sclp_find_gds_subvector(sv + 1, (void *) sv + sv->length, 1);
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/* Find the 0x02 block inside the 0x81 block. */
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cpc = sclp_find_gds_subvector(sv + 1, (void *) sv + sv->length, 2);
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/* Copy network name and cpc name. */
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spin_lock(&sclp_ocf_lock);
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if (netid) {
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size = min(OCF_LENGTH_HMC_NETWORK, (size_t) netid->length);
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memcpy(hmc_network, netid + 1, size);
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EBCASC(hmc_network, size);
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hmc_network[size] = 0;
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}
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if (cpc) {
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size = min(OCF_LENGTH_CPC_NAME, (size_t) cpc->length);
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memset(cpc_name, 0, OCF_LENGTH_CPC_NAME);
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memcpy(cpc_name, cpc + 1, size);
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}
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spin_unlock(&sclp_ocf_lock);
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schedule_work(&sclp_ocf_change_work);
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}
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static struct sclp_register sclp_ocf_event = {
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.receive_mask = EVTYP_OCF_MASK,
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.receiver_fn = sclp_ocf_handler,
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};
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void sclp_ocf_cpc_name_copy(char *dst)
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{
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spin_lock_irq(&sclp_ocf_lock);
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memcpy(dst, cpc_name, OCF_LENGTH_CPC_NAME);
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spin_unlock_irq(&sclp_ocf_lock);
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}
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EXPORT_SYMBOL(sclp_ocf_cpc_name_copy);
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static ssize_t cpc_name_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *page)
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{
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char name[OCF_LENGTH_CPC_NAME + 1];
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sclp_ocf_cpc_name_copy(name);
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name[OCF_LENGTH_CPC_NAME] = 0;
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EBCASC(name, OCF_LENGTH_CPC_NAME);
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return snprintf(page, PAGE_SIZE, "%s\n", name);
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}
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static struct kobj_attribute cpc_name_attr =
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__ATTR(cpc_name, 0444, cpc_name_show, NULL);
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static ssize_t hmc_network_show(struct kobject *kobj,
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struct kobj_attribute *attr, char *page)
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{
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int rc;
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spin_lock_irq(&sclp_ocf_lock);
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rc = snprintf(page, PAGE_SIZE, "%s\n", hmc_network);
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spin_unlock_irq(&sclp_ocf_lock);
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return rc;
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}
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static struct kobj_attribute hmc_network_attr =
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__ATTR(hmc_network, 0444, hmc_network_show, NULL);
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static struct attribute *ocf_attrs[] = {
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&cpc_name_attr.attr,
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&hmc_network_attr.attr,
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NULL,
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};
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static const struct attribute_group ocf_attr_group = {
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.attrs = ocf_attrs,
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};
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static int __init ocf_init(void)
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{
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int rc;
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INIT_WORK(&sclp_ocf_change_work, sclp_ocf_change_notify);
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ocf_kset = kset_create_and_add("ocf", NULL, firmware_kobj);
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if (!ocf_kset)
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return -ENOMEM;
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rc = sysfs_create_group(&ocf_kset->kobj, &ocf_attr_group);
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if (rc) {
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kset_unregister(ocf_kset);
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return rc;
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}
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return sclp_register(&sclp_ocf_event);
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}
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device_initcall(ocf_init);
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