[S390] add call home support

Signed-off-by: Hans-Joachim Picht <hans@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 224 insertions, 0 deletions

diff --git a/drivers/s390/char/sclp_async.c b/drivers/s390/char/sclp_async.c
new file mode 100644
index 000000000000..daaec185ed36
--- /dev/null
+++ b/drivers/s390/char/sclp_async.c
@@ -0,0 +1,224 @@
+/*
+ * Enable Asynchronous Notification via SCLP.
+ *
+ * Copyright IBM Corp. 2009
+ * Author(s): Hans-Joachim Picht <hans@linux.vnet.ibm.com>
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/module.h>
+#include <linux/device.h>
+#include <linux/stat.h>
+#include <linux/string.h>
+#include <linux/ctype.h>
+#include <linux/kmod.h>
+#include <linux/err.h>
+#include <linux/errno.h>
+#include <linux/proc_fs.h>
+#include <linux/sysctl.h>
+#include <linux/utsname.h>
+#include "sclp.h"
+
+static int callhome_enabled;
+static struct sclp_req *request;
+static struct sclp_async_sccb *sccb;
+static int sclp_async_send_wait(char *message);
+static struct ctl_table_header *callhome_sysctl_header;
+static DEFINE_SPINLOCK(sclp_async_lock);
+static char nodename[64];
+#define SCLP_NORMAL_WRITE       0x00
+
+struct async_evbuf {
+        struct evbuf_header header;
+        u64 reserved;
+        u8 rflags;
+        u8 empty;
+        u8 rtype;
+        u8 otype;
+        char comp_id[12];
+        char data[3000]; /* there is still some space left */
+} __attribute__((packed));
+
+struct sclp_async_sccb {
+        struct sccb_header header;
+        struct async_evbuf evbuf;
+} __attribute__((packed));
+
+static struct sclp_register sclp_async_register = {
+        .send_mask = EVTYP_ASYNC_MASK,
+};
+
+static int call_home_on_panic(struct notifier_block *self,
+                              unsigned long event, void *data)
+{
+                strncat(data, nodename, strlen(nodename));
+                sclp_async_send_wait(data);
+                return NOTIFY_DONE;
+}
+
+static struct notifier_block call_home_panic_nb = {
+        .notifier_call = call_home_on_panic,
+        .priority = INT_MAX,
+};
+
+static int proc_handler_callhome(ctl_table *ctl, int write, struct file *filp,
+                                 void __user *buffer, size_t *count,
+                                 loff_t *ppos)
+{
+        unsigned long val;
+        int len, rc;
+        char buf[2];
+
+        if (!*count | (*ppos && !write)) {
+                *count = 0;
+                return 0;
+        }
+        if (!write) {
+                len =  sprintf(buf, "%d\n", callhome_enabled);
+                buf[len] = '\0';
+                rc = copy_to_user(buffer, buf, sizeof(buf));
+                if (rc != 0)
+                        return -EFAULT;
+        } else {
+                len = *count;
+                rc = copy_from_user(buf, buffer, sizeof(buf));
+                if (rc != 0)
+                        return -EFAULT;
+                if (strict_strtoul(buf, 0, &val) != 0)
+                        return -EINVAL;
+                if (val != 0 && val != 1)
+                        return -EINVAL;
+                callhome_enabled = val;
+        }
+        *count = len;
+        *ppos += len;
+        return 0;
+}
+
+static struct ctl_table callhome_table[] = {
+        {
+                .procname       = "callhome",
+                .mode           = 0644,
+                .proc_handler   = &proc_handler_callhome,
+        },
+        { .ctl_name = 0 }
+};
+
+static struct ctl_table kern_dir_table[] = {
+        {
+                .ctl_name       = CTL_KERN,
+                .procname       = "kernel",
+                .maxlen         = 0,
+                .mode           = 0555,
+                .child          = callhome_table,
+        },
+        { .ctl_name = 0 }
+};
+
+/*
+ * Function used to transfer asynchronous notification
+ * records which waits for send completion
+ */
+static int sclp_async_send_wait(char *message)
+{
+        struct async_evbuf *evb;
+        int rc;
+        unsigned long flags;
+
+        if (!callhome_enabled)
+                return 0;
+        sccb->evbuf.header.type = EVTYP_ASYNC;
+        sccb->evbuf.rtype = 0xA5;
+        sccb->evbuf.otype = 0x00;
+        evb = &sccb->evbuf;
+        request->command = SCLP_CMDW_WRITE_EVENT_DATA;
+        request->sccb = sccb;
+        request->status = SCLP_REQ_FILLED;
+        strncpy(sccb->evbuf.data, message, sizeof(sccb->evbuf.data));
+        /*
+         * Retain Queue
+         * e.g. 5639CC140 500 Red Hat RHEL5 Linux for zSeries (RHEL AS)
+         */
+        strncpy(sccb->evbuf.comp_id, "000000000", sizeof(sccb->evbuf.comp_id));
+        sccb->evbuf.header.length = sizeof(sccb->evbuf);
+        sccb->header.length = sizeof(sccb->evbuf) + sizeof(sccb->header);
+        sccb->header.function_code = SCLP_NORMAL_WRITE;
+        rc = sclp_add_request(request);
+        if (rc)
+                return rc;
+        spin_lock_irqsave(&sclp_async_lock, flags);
+        while (request->status != SCLP_REQ_DONE &&
+                request->status != SCLP_REQ_FAILED) {
+                 sclp_sync_wait();
+        }
+        spin_unlock_irqrestore(&sclp_async_lock, flags);
+        if (request->status != SCLP_REQ_DONE)
+                return -EIO;
+        rc = ((struct sclp_async_sccb *)
+               request->sccb)->header.response_code;
+        if (rc != 0x0020)
+                return -EIO;
+        if (evb->header.flags != 0x80)
+                return -EIO;
+        return rc;
+}
+
+static int __init sclp_async_init(void)
+{
+        int rc;
+
+        rc = sclp_register(&sclp_async_register);
+        if (rc)
+                return rc;
+        callhome_sysctl_header = register_sysctl_table(kern_dir_table);
+        if (!callhome_sysctl_header) {
+                rc = -ENOMEM;
+                goto out_sclp;
+        }
+        if (!(sclp_async_register.sclp_receive_mask & EVTYP_ASYNC_MASK)) {
+                rc = -EOPNOTSUPP;
+                goto out_sclp;
+        }
+        rc = -ENOMEM;
+        request = kzalloc(sizeof(struct sclp_req), GFP_KERNEL);
+        if (!request)
+                goto out_sys;
+        sccb = (struct sclp_async_sccb *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
+        if (!sccb)
+                goto out_mem;
+        rc =  atomic_notifier_chain_register(&panic_notifier_list,
+                                             &call_home_panic_nb);
+        if (rc)
+                goto out_mem;
+
+        strncpy(nodename, init_utsname()->nodename, 64);
+        return 0;
+
+out_mem:
+        kfree(request);
+        free_page((unsigned long) sccb);
+out_sys:
+        unregister_sysctl_table(callhome_sysctl_header);
+out_sclp:
+        sclp_unregister(&sclp_async_register);
+        return rc;
+
+}
+module_init(sclp_async_init);
+
+static void __exit sclp_async_exit(void)
+{
+        atomic_notifier_chain_unregister(&panic_notifier_list,
+                                         &call_home_panic_nb);
+        unregister_sysctl_table(callhome_sysctl_header);
+        sclp_unregister(&sclp_async_register);
+        free_page((unsigned long) sccb);
+        kfree(request);
+}
+module_exit(sclp_async_exit);
+
+MODULE_AUTHOR("Copyright IBM Corp. 2009");
+MODULE_AUTHOR("Hans-Joachim Picht <hans@linux.vnet.ibm.com>");
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("SCLP Asynchronous Notification Records");