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[S390] sclp: sysfs interface for SCLP cpi
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Signed-off-by: Michael Ernst <mernst@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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Michael Ernst authored and Martin Schwidefsky committed Jan 26, 2008
1 parent dfa77f6 commit c05ffc4
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Showing 4 changed files with 432 additions and 231 deletions.
2 changes: 1 addition & 1 deletion drivers/s390/char/Makefile
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#

obj-y += ctrlchar.o keyboard.o defkeymap.o sclp.o sclp_rw.o sclp_quiesce.o \
sclp_info.o sclp_config.o sclp_chp.o
sclp_info.o sclp_config.o sclp_chp.o sclp_cpi_sys.o

obj-$(CONFIG_TN3270) += raw3270.o
obj-$(CONFIG_TN3270_CONSOLE) += con3270.o
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246 changes: 16 additions & 230 deletions drivers/s390/char/sclp_cpi.c
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@@ -1,255 +1,41 @@
/*
* Author: Martin Peschke <mpeschke@de.ibm.com>
* Copyright (C) 2001 IBM Entwicklung GmbH, IBM Corporation
* drivers/s390/char/sclp_cpi.c
* SCLP control programm identification
*
* SCLP Control-Program Identification.
* Copyright IBM Corp. 2001, 2007
* Author(s): Martin Peschke <mpeschke@de.ibm.com>
* Michael Ernst <mernst@de.ibm.com>
*/

#include <linux/version.h>
#include <linux/kmod.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/init.h>
#include <linux/timer.h>
#include <linux/string.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <asm/ebcdic.h>
#include <asm/semaphore.h>

#include "sclp.h"
#include "sclp_rw.h"

#define CPI_LENGTH_SYSTEM_TYPE 8
#define CPI_LENGTH_SYSTEM_NAME 8
#define CPI_LENGTH_SYSPLEX_NAME 8

struct cpi_evbuf {
struct evbuf_header header;
u8 id_format;
u8 reserved0;
u8 system_type[CPI_LENGTH_SYSTEM_TYPE];
u64 reserved1;
u8 system_name[CPI_LENGTH_SYSTEM_NAME];
u64 reserved2;
u64 system_level;
u64 reserved3;
u8 sysplex_name[CPI_LENGTH_SYSPLEX_NAME];
u8 reserved4[16];
} __attribute__((packed));

struct cpi_sccb {
struct sccb_header header;
struct cpi_evbuf cpi_evbuf;
} __attribute__((packed));

/* Event type structure for write message and write priority message */
static struct sclp_register sclp_cpi_event =
{
.send_mask = EVTYP_CTLPROGIDENT_MASK
};
#include <linux/version.h>
#include "sclp_cpi_sys.h"

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("Identify this operating system instance "
"to the System z hardware");
MODULE_AUTHOR("Martin Peschke <mpeschke@de.ibm.com>, "
"Michael Ernst <mernst@de.ibm.com>");

MODULE_AUTHOR(
"Martin Peschke, IBM Deutschland Entwicklung GmbH "
"<mpeschke@de.ibm.com>");

MODULE_DESCRIPTION(
"identify this operating system instance to the S/390 "
"or zSeries hardware");
static char *system_name = "";
static char *sysplex_name = "";

static char *system_name = NULL;
module_param(system_name, charp, 0);
MODULE_PARM_DESC(system_name, "e.g. hostname - max. 8 characters");

static char *sysplex_name = NULL;
#ifdef ALLOW_SYSPLEX_NAME
module_param(sysplex_name, charp, 0);
MODULE_PARM_DESC(sysplex_name, "if applicable - max. 8 characters");
#endif

/* use default value for this field (as well as for system level) */
static char *system_type = "LINUX";

static int
cpi_check_parms(void)
static int __init cpi_module_init(void)
{
/* reject if no system type specified */
if (!system_type) {
printk("cpi: bug: no system type specified\n");
return -EINVAL;
}

/* reject if system type larger than 8 characters */
if (strlen(system_type) > CPI_LENGTH_SYSTEM_NAME) {
printk("cpi: bug: system type has length of %li characters - "
"only %i characters supported\n",
strlen(system_type), CPI_LENGTH_SYSTEM_TYPE);
return -EINVAL;
}

/* reject if no system name specified */
if (!system_name) {
printk("cpi: no system name specified\n");
return -EINVAL;
}

/* reject if system name larger than 8 characters */
if (strlen(system_name) > CPI_LENGTH_SYSTEM_NAME) {
printk("cpi: system name has length of %li characters - "
"only %i characters supported\n",
strlen(system_name), CPI_LENGTH_SYSTEM_NAME);
return -EINVAL;
}

/* reject if specified sysplex name larger than 8 characters */
if (sysplex_name && strlen(sysplex_name) > CPI_LENGTH_SYSPLEX_NAME) {
printk("cpi: sysplex name has length of %li characters"
" - only %i characters supported\n",
strlen(sysplex_name), CPI_LENGTH_SYSPLEX_NAME);
return -EINVAL;
}
return 0;
return sclp_cpi_set_data(system_name, sysplex_name, "LINUX",
LINUX_VERSION_CODE);
}

static void
cpi_callback(struct sclp_req *req, void *data)
{
struct semaphore *sem;

sem = (struct semaphore *) data;
up(sem);
}

static struct sclp_req *
cpi_prepare_req(void)
{
struct sclp_req *req;
struct cpi_sccb *sccb;
struct cpi_evbuf *evb;

req = kmalloc(sizeof(struct sclp_req), GFP_KERNEL);
if (req == NULL)
return ERR_PTR(-ENOMEM);
sccb = (struct cpi_sccb *) __get_free_page(GFP_KERNEL | GFP_DMA);
if (sccb == NULL) {
kfree(req);
return ERR_PTR(-ENOMEM);
}
memset(sccb, 0, sizeof(struct cpi_sccb));

/* setup SCCB for Control-Program Identification */
sccb->header.length = sizeof(struct cpi_sccb);
sccb->cpi_evbuf.header.length = sizeof(struct cpi_evbuf);
sccb->cpi_evbuf.header.type = 0x0B;
evb = &sccb->cpi_evbuf;

/* set system type */
memset(evb->system_type, ' ', CPI_LENGTH_SYSTEM_TYPE);
memcpy(evb->system_type, system_type, strlen(system_type));
sclp_ascebc_str(evb->system_type, CPI_LENGTH_SYSTEM_TYPE);
EBC_TOUPPER(evb->system_type, CPI_LENGTH_SYSTEM_TYPE);

/* set system name */
memset(evb->system_name, ' ', CPI_LENGTH_SYSTEM_NAME);
memcpy(evb->system_name, system_name, strlen(system_name));
sclp_ascebc_str(evb->system_name, CPI_LENGTH_SYSTEM_NAME);
EBC_TOUPPER(evb->system_name, CPI_LENGTH_SYSTEM_NAME);

/* set system level */
evb->system_level = LINUX_VERSION_CODE;

/* set sysplex name */
if (sysplex_name) {
memset(evb->sysplex_name, ' ', CPI_LENGTH_SYSPLEX_NAME);
memcpy(evb->sysplex_name, sysplex_name, strlen(sysplex_name));
sclp_ascebc_str(evb->sysplex_name, CPI_LENGTH_SYSPLEX_NAME);
EBC_TOUPPER(evb->sysplex_name, CPI_LENGTH_SYSPLEX_NAME);
}

/* prepare request data structure presented to SCLP driver */
req->command = SCLP_CMDW_WRITE_EVENT_DATA;
req->sccb = sccb;
req->status = SCLP_REQ_FILLED;
req->callback = cpi_callback;
return req;
}

static void
cpi_free_req(struct sclp_req *req)
{
free_page((unsigned long) req->sccb);
kfree(req);
}

static int __init
cpi_module_init(void)
{
struct semaphore sem;
struct sclp_req *req;
int rc;

rc = cpi_check_parms();
if (rc)
return rc;

rc = sclp_register(&sclp_cpi_event);
if (rc) {
/* could not register sclp event. Die. */
printk(KERN_WARNING "cpi: could not register to hardware "
"console.\n");
return -EINVAL;
}
if (!(sclp_cpi_event.sclp_send_mask & EVTYP_CTLPROGIDENT_MASK)) {
printk(KERN_WARNING "cpi: no control program identification "
"support\n");
sclp_unregister(&sclp_cpi_event);
return -EOPNOTSUPP;
}

req = cpi_prepare_req();
if (IS_ERR(req)) {
printk(KERN_WARNING "cpi: couldn't allocate request\n");
sclp_unregister(&sclp_cpi_event);
return PTR_ERR(req);
}

/* Prepare semaphore */
sema_init(&sem, 0);
req->callback_data = &sem;
/* Add request to sclp queue */
rc = sclp_add_request(req);
if (rc) {
printk(KERN_WARNING "cpi: could not start request\n");
cpi_free_req(req);
sclp_unregister(&sclp_cpi_event);
return rc;
}
/* make "insmod" sleep until callback arrives */
down(&sem);

rc = ((struct cpi_sccb *) req->sccb)->header.response_code;
if (rc != 0x0020) {
printk(KERN_WARNING "cpi: failed with response code 0x%x\n",
rc);
rc = -ECOMM;
} else
rc = 0;

cpi_free_req(req);
sclp_unregister(&sclp_cpi_event);

return rc;
}


static void __exit cpi_module_exit(void)
{
}


/* declare driver module init/cleanup functions */
module_init(cpi_module_init);
module_exit(cpi_module_exit);

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