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path: root/drivers/s390/char/sclp_ocf.c
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Diffstat (limited to 'drivers/s390/char/sclp_ocf.c')
-rw-r--r--drivers/s390/char/sclp_ocf.c152
1 files changed, 152 insertions, 0 deletions
diff --git a/drivers/s390/char/sclp_ocf.c b/drivers/s390/char/sclp_ocf.c
new file mode 100644
index 000000000..d35f10ea5
--- /dev/null
+++ b/drivers/s390/char/sclp_ocf.c
@@ -0,0 +1,152 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * SCLP OCF communication parameters sysfs interface
+ *
+ * Copyright IBM Corp. 2011
+ * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
+ */
+
+#define KMSG_COMPONENT "sclp_ocf"
+#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
+
+#include <linux/kernel.h>
+#include <linux/init.h>
+#include <linux/stat.h>
+#include <linux/device.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+#include <linux/kmod.h>
+#include <linux/timer.h>
+#include <linux/err.h>
+#include <asm/ebcdic.h>
+#include <asm/sclp.h>
+
+#include "sclp.h"
+
+#define OCF_LENGTH_HMC_NETWORK 8UL
+#define OCF_LENGTH_CPC_NAME 8UL
+
+static char hmc_network[OCF_LENGTH_HMC_NETWORK + 1];
+static char cpc_name[OCF_LENGTH_CPC_NAME]; /* in EBCDIC */
+
+static DEFINE_SPINLOCK(sclp_ocf_lock);
+static struct work_struct sclp_ocf_change_work;
+
+static struct kset *ocf_kset;
+
+static void sclp_ocf_change_notify(struct work_struct *work)
+{
+ kobject_uevent(&ocf_kset->kobj, KOBJ_CHANGE);
+}
+
+/* Handler for OCF event. Look for the CPC image name. */
+static void sclp_ocf_handler(struct evbuf_header *evbuf)
+{
+ struct gds_vector *v;
+ struct gds_subvector *sv, *netid, *cpc;
+ size_t size;
+
+ /* Find the 0x9f00 block. */
+ v = sclp_find_gds_vector(evbuf + 1, (void *) evbuf + evbuf->length,
+ 0x9f00);
+ if (!v)
+ return;
+ /* Find the 0x9f22 block inside the 0x9f00 block. */
+ v = sclp_find_gds_vector(v + 1, (void *) v + v->length, 0x9f22);
+ if (!v)
+ return;
+ /* Find the 0x81 block inside the 0x9f22 block. */
+ sv = sclp_find_gds_subvector(v + 1, (void *) v + v->length, 0x81);
+ if (!sv)
+ return;
+ /* Find the 0x01 block inside the 0x81 block. */
+ netid = sclp_find_gds_subvector(sv + 1, (void *) sv + sv->length, 1);
+ /* Find the 0x02 block inside the 0x81 block. */
+ cpc = sclp_find_gds_subvector(sv + 1, (void *) sv + sv->length, 2);
+ /* Copy network name and cpc name. */
+ spin_lock(&sclp_ocf_lock);
+ if (netid) {
+ size = min(OCF_LENGTH_HMC_NETWORK, (size_t) netid->length);
+ memcpy(hmc_network, netid + 1, size);
+ EBCASC(hmc_network, size);
+ hmc_network[size] = 0;
+ }
+ if (cpc) {
+ size = min(OCF_LENGTH_CPC_NAME, (size_t) cpc->length);
+ memset(cpc_name, 0, OCF_LENGTH_CPC_NAME);
+ memcpy(cpc_name, cpc + 1, size);
+ }
+ spin_unlock(&sclp_ocf_lock);
+ schedule_work(&sclp_ocf_change_work);
+}
+
+static struct sclp_register sclp_ocf_event = {
+ .receive_mask = EVTYP_OCF_MASK,
+ .receiver_fn = sclp_ocf_handler,
+};
+
+void sclp_ocf_cpc_name_copy(char *dst)
+{
+ spin_lock_irq(&sclp_ocf_lock);
+ memcpy(dst, cpc_name, OCF_LENGTH_CPC_NAME);
+ spin_unlock_irq(&sclp_ocf_lock);
+}
+EXPORT_SYMBOL(sclp_ocf_cpc_name_copy);
+
+static ssize_t cpc_name_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *page)
+{
+ char name[OCF_LENGTH_CPC_NAME + 1];
+
+ sclp_ocf_cpc_name_copy(name);
+ name[OCF_LENGTH_CPC_NAME] = 0;
+ EBCASC(name, OCF_LENGTH_CPC_NAME);
+ return snprintf(page, PAGE_SIZE, "%s\n", name);
+}
+
+static struct kobj_attribute cpc_name_attr =
+ __ATTR(cpc_name, 0444, cpc_name_show, NULL);
+
+static ssize_t hmc_network_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *page)
+{
+ int rc;
+
+ spin_lock_irq(&sclp_ocf_lock);
+ rc = snprintf(page, PAGE_SIZE, "%s\n", hmc_network);
+ spin_unlock_irq(&sclp_ocf_lock);
+ return rc;
+}
+
+static struct kobj_attribute hmc_network_attr =
+ __ATTR(hmc_network, 0444, hmc_network_show, NULL);
+
+static struct attribute *ocf_attrs[] = {
+ &cpc_name_attr.attr,
+ &hmc_network_attr.attr,
+ NULL,
+};
+
+static const struct attribute_group ocf_attr_group = {
+ .attrs = ocf_attrs,
+};
+
+static int __init ocf_init(void)
+{
+ int rc;
+
+ INIT_WORK(&sclp_ocf_change_work, sclp_ocf_change_notify);
+ ocf_kset = kset_create_and_add("ocf", NULL, firmware_kobj);
+ if (!ocf_kset)
+ return -ENOMEM;
+
+ rc = sysfs_create_group(&ocf_kset->kobj, &ocf_attr_group);
+ if (rc) {
+ kset_unregister(ocf_kset);
+ return rc;
+ }
+
+ return sclp_register(&sclp_ocf_event);
+}
+
+device_initcall(ocf_init);