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[PATCH] s390: add vmcp interface

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Add interface to issue VM control program commands.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Christian Borntraeger 2005-06-25 14:55:32 -07:00 committed by Linus Torvalds
parent 77fa22450d
commit 6b979de395
15 changed files with 359 additions and 66 deletions
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1
arch/s390/defconfig
View file

@ -245,6 +245,7 @@ CONFIG_S390_TAPE_BLOCK=y
#
CONFIG_S390_TAPE_34XX=m
# CONFIG_VMLOGRDR is not set
# CONFIG_VMCP is not set
# CONFIG_MONREADER is not set
# CONFIG_DCSS_SHM is not set

109
arch/s390/kernel/cpcmd.c
View file

@ -2,7 +2,7 @@
* arch/s390/kernel/cpcmd.c
*
* S390 version
* Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Copyright (C) 1999,2005 IBM Deutschland Entwicklung GmbH, IBM Corporation
* Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
* Christian Borntraeger (cborntra@de.ibm.com),
*/
@ -18,93 +18,114 @@
#include <asm/system.h>
static DEFINE_SPINLOCK(cpcmd_lock);
static char cpcmd_buf[240];
static char cpcmd_buf[241];
/*
* the caller of __cpcmd has to ensure that the response buffer is below 2 GB
*/
void __cpcmd(char *cmd, char *response, int rlen)
int __cpcmd(const char *cmd, char *response, int rlen, int *response_code)
{
const int mask = 0x40000000L;
unsigned long flags;
int return_code;
int return_len;
int cmdlen;
spin_lock_irqsave(&cpcmd_lock, flags);
cmdlen = strlen(cmd);
BUG_ON(cmdlen > 240);
strcpy(cpcmd_buf, cmd);
memcpy(cpcmd_buf, cmd, cmdlen);
ASCEBC(cpcmd_buf, cmdlen);
if (response != NULL && rlen > 0) {
memset(response, 0, rlen);
#ifndef CONFIG_ARCH_S390X
asm volatile ("LRA 2,0(%0)\n\t"
"LR 4,%1\n\t"
"O 4,%4\n\t"
"LRA 3,0(%2)\n\t"
"LR 5,%3\n\t"
".long 0x83240008 # Diagnose X'08'\n\t"
: /* no output */
: "a" (cpcmd_buf), "d" (cmdlen),
"a" (response), "d" (rlen), "m" (mask)
: "cc", "2", "3", "4", "5" );
asm volatile ( "lra 2,0(%2)\n"
"lr 4,%3\n"
"o 4,%6\n"
"lra 3,0(%4)\n"
"lr 5,%5\n"
"diag 2,4,0x8\n"
"brc 8, .Litfits\n"
"ar 5, %5\n"
".Litfits: \n"
"lr %0,4\n"
"lr %1,5\n"
: "=d" (return_code), "=d" (return_len)
: "a" (cpcmd_buf), "d" (cmdlen),
"a" (response), "d" (rlen), "m" (mask)
: "cc", "2", "3", "4", "5" );
#else /* CONFIG_ARCH_S390X */
asm volatile (" lrag 2,0(%0)\n"
" lgr 4,%1\n"
" o 4,%4\n"
" lrag 3,0(%2)\n"
" lgr 5,%3\n"
" sam31\n"
" .long 0x83240008 # Diagnose X'08'\n"
" sam64"
: /* no output */
: "a" (cpcmd_buf), "d" (cmdlen),
"a" (response), "d" (rlen), "m" (mask)
: "cc", "2", "3", "4", "5" );
asm volatile ( "lrag 2,0(%2)\n"
"lgr 4,%3\n"
"o 4,%6\n"
"lrag 3,0(%4)\n"
"lgr 5,%5\n"
"sam31\n"
"diag 2,4,0x8\n"
"sam64\n"
"brc 8, .Litfits\n"
"agr 5, %5\n"
".Litfits: \n"
"lgr %0,4\n"
"lgr %1,5\n"
: "=d" (return_code), "=d" (return_len)
: "a" (cpcmd_buf), "d" (cmdlen),
"a" (response), "d" (rlen), "m" (mask)
: "cc", "2", "3", "4", "5" );
#endif /* CONFIG_ARCH_S390X */
EBCASC(response, rlen);
} else {
return_len = 0;
#ifndef CONFIG_ARCH_S390X
asm volatile ("LRA 2,0(%0)\n\t"
"LR 3,%1\n\t"
".long 0x83230008 # Diagnose X'08'\n\t"
: /* no output */
: "a" (cpcmd_buf), "d" (cmdlen)
: "2", "3" );
asm volatile ( "lra 2,0(%1)\n"
"lr 3,%2\n"
"diag 2,3,0x8\n"
"lr %0,3\n"
: "=d" (return_code)
: "a" (cpcmd_buf), "d" (cmdlen)
: "2", "3" );
#else /* CONFIG_ARCH_S390X */
asm volatile (" lrag 2,0(%0)\n"
" lgr 3,%1\n"
" sam31\n"
" .long 0x83230008 # Diagnose X'08'\n"
" sam64"
: /* no output */
: "a" (cpcmd_buf), "d" (cmdlen)
: "2", "3" );
asm volatile ( "lrag 2,0(%1)\n"
"lgr 3,%2\n"
"sam31\n"
"diag 2,3,0x8\n"
"sam64\n"
"lgr %0,3\n"
: "=d" (return_code)
: "a" (cpcmd_buf), "d" (cmdlen)
: "2", "3" );
#endif /* CONFIG_ARCH_S390X */
}
spin_unlock_irqrestore(&cpcmd_lock, flags);
if (response_code != NULL)
*response_code = return_code;
return return_len;
}
EXPORT_SYMBOL(__cpcmd);
#ifdef CONFIG_ARCH_S390X
void cpcmd(char *cmd, char *response, int rlen)
int cpcmd(const char *cmd, char *response, int rlen, int *response_code)
{
char *lowbuf;
int len;
if ((rlen == 0) || (response == NULL)
|| !((unsigned long)response >> 31))
__cpcmd(cmd, response, rlen);
len = __cpcmd(cmd, response, rlen, response_code);
else {
lowbuf = kmalloc(rlen, GFP_KERNEL | GFP_DMA);
if (!lowbuf) {
printk(KERN_WARNING
"cpcmd: could not allocate response buffer\n");
return;
return -ENOMEM;
}
__cpcmd(cmd, lowbuf, rlen);
len = __cpcmd(cmd, lowbuf, rlen, response_code);
memcpy(response, lowbuf, rlen);
kfree(lowbuf);
}
return len;
}
EXPORT_SYMBOL(cpcmd);

6
arch/s390/kernel/setup.c
View file

@ -198,11 +198,11 @@ static void __init conmode_default(void)
char *ptr;
if (MACHINE_IS_VM) {
__cpcmd("QUERY CONSOLE", query_buffer, 1024);
__cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
ptr = strstr(query_buffer, "SUBCHANNEL =");
console_irq = simple_strtoul(ptr + 13, NULL, 16);
__cpcmd("QUERY TERM", query_buffer, 1024);
__cpcmd("QUERY TERM", query_buffer, 1024, NULL);
ptr = strstr(query_buffer, "CONMODE");
/*
* Set the conmode to 3215 so that the device recognition
@ -211,7 +211,7 @@ static void __init conmode_default(void)
* 3215 and the 3270 driver will try to access the console
* device (3215 as console and 3270 as normal tty).
*/
__cpcmd("TERM CONMODE 3215", NULL, 0);
__cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
if (ptr == NULL) {
#if defined(CONFIG_SCLP_CONSOLE)
SET_CONSOLE_SCLP;

6
arch/s390/kernel/smp.c
View file

@ -284,7 +284,7 @@ static void do_machine_restart(void * __unused)
* locks are always held disabled).
*/
if (MACHINE_IS_VM)
cpcmd ("IPL", NULL, 0);
cpcmd ("IPL", NULL, 0, NULL);
else
reipl (0x10000 | S390_lowcore.ipl_device);
}
@ -313,7 +313,7 @@ static void do_machine_halt(void * __unused)
if (atomic_compare_and_swap(-1, smp_processor_id(), &cpuid) == 0) {
smp_send_stop();
if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
cpcmd(vmhalt_cmd, NULL, 0);
cpcmd(vmhalt_cmd, NULL, 0, NULL);
signal_processor(smp_processor_id(),
sigp_stop_and_store_status);
}
@ -332,7 +332,7 @@ static void do_machine_power_off(void * __unused)
if (atomic_compare_and_swap(-1, smp_processor_id(), &cpuid) == 0) {
smp_send_stop();
if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
cpcmd(vmpoff_cmd, NULL, 0);
cpcmd(vmpoff_cmd, NULL, 0, NULL);
signal_processor(smp_processor_id(),
sigp_stop_and_store_status);
}

2
arch/s390/kernel/traps.c
View file

@ -735,7 +735,7 @@ void __init trap_init(void)
&ext_int_pfault);
#endif
#ifndef CONFIG_ARCH_S390X
cpcmd("SET PAGEX ON", NULL, 0);
cpcmd("SET PAGEX ON", NULL, 0, NULL);
#endif
}
}

4
arch/s390/mm/extmem.c
View file

@ -576,8 +576,8 @@ segment_save(char *name)
segtype_string[seg->range[i].start & 0xff]);
}
sprintf(cmd2, "SAVESEG %s", name);
cpcmd(cmd1, NULL, 0);
cpcmd(cmd2, NULL, 0);
cpcmd(cmd1, NULL, 0, NULL);
cpcmd(cmd2, NULL, 0, NULL);
spin_unlock(&dcss_lock);
}

7
drivers/s390/Kconfig
View file

@ -187,6 +187,13 @@ config VMLOGRDR
*SYMPTOM.
This driver depends on the IUCV support driver.
config VMCP
tristate "Support for the z/VM CP interface (VM only)"
help
Select this option if you want to be able to interact with the control
program on z/VM
config MONREADER
tristate "API for reading z/VM monitor service records"
depends on IUCV

1
drivers/s390/char/Makefile
View file

@ -19,6 +19,7 @@ obj-$(CONFIG_SCLP_CPI) += sclp_cpi.o
obj-$(CONFIG_ZVM_WATCHDOG) += vmwatchdog.o
obj-$(CONFIG_VMLOGRDR) += vmlogrdr.o
obj-$(CONFIG_VMCP) += vmcp.o
tape-$(CONFIG_S390_TAPE_BLOCK) += tape_block.o
tape-$(CONFIG_PROC_FS) += tape_proc.o

4
drivers/s390/char/con3215.c
View file

@ -860,8 +860,8 @@ con3215_init(void)
/* Set the console mode for VM */
if (MACHINE_IS_VM) {
cpcmd("TERM CONMODE 3215", NULL, 0);
cpcmd("TERM AUTOCR OFF", NULL, 0);
cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
}
/* allocate 3215 request structures */

4
drivers/s390/char/con3270.c
View file

@ -591,8 +591,8 @@ con3270_init(void)
/* Set the console mode for VM */
if (MACHINE_IS_VM) {
cpcmd("TERM CONMODE 3270", 0, 0);
cpcmd("TERM AUTOCR OFF", 0, 0);
cpcmd("TERM CONMODE 3270", NULL, 0, NULL);
cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
}
cdev = ccw_device_probe_console();

219
drivers/s390/char/vmcp.c Normal file
View file

@ -0,0 +1,219 @@
/*
* Copyright (C) 2004,2005 IBM Corporation
* Interface implementation for communication with the v/VM control program
* Author(s): Christian Borntraeger <cborntra@de.ibm.com>
*
*
* z/VMs CP offers the possibility to issue commands via the diagnose code 8
* this driver implements a character device that issues these commands and
* returns the answer of CP.
* The idea of this driver is based on cpint from Neale Ferguson and #CP in CMS
*/
#include <linux/fs.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/miscdevice.h>
#include <linux/module.h>
#include <asm/cpcmd.h>
#include <asm/debug.h>
#include <asm/uaccess.h>
#include "vmcp.h"
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Christian Borntraeger <cborntra@de.ibm.com>");
MODULE_DESCRIPTION("z/VM CP interface");
static debug_info_t *vmcp_debug;
static int vmcp_open(struct inode *inode, struct file *file)
{
struct vmcp_session *session;
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
session = kmalloc(sizeof(*session), GFP_KERNEL);
if (!session)
return -ENOMEM;
session->bufsize = PAGE_SIZE;
session->response = NULL;
session->resp_size = 0;
init_MUTEX(&session->mutex);
file->private_data = session;
return nonseekable_open(inode, file);
}
static int vmcp_release(struct inode *inode, struct file *file)
{
struct vmcp_session *session;
session = (struct vmcp_session *)file->private_data;
file->private_data = NULL;
free_pages((unsigned long)session->response, get_order(session->bufsize));
kfree(session);
return 0;
}
static ssize_t
vmcp_read(struct file *file, char __user * buff, size_t count, loff_t * ppos)
{
size_t tocopy;
struct vmcp_session *session;
session = (struct vmcp_session *)file->private_data;
if (down_interruptible(&session->mutex))
return -ERESTARTSYS;
if (!session->response) {
up(&session->mutex);
return 0;
}
if (*ppos > session->resp_size) {
up(&session->mutex);
return 0;
}
tocopy = min(session->resp_size - (size_t) (*ppos), count);
tocopy = min(tocopy,session->bufsize - (size_t) (*ppos));
if (copy_to_user(buff, session->response + (*ppos), tocopy)) {
up(&session->mutex);
return -EFAULT;
}
up(&session->mutex);
*ppos += tocopy;
return tocopy;
}
static ssize_t
vmcp_write(struct file *file, const char __user * buff, size_t count,
loff_t * ppos)
{
char *cmd;
struct vmcp_session *session;
if (count > 240)
return -EINVAL;
cmd = kmalloc(count + 1, GFP_KERNEL);
if (!cmd)
return -ENOMEM;
if (copy_from_user(cmd, buff, count)) {
kfree(cmd);
return -EFAULT;
}
cmd[count] = '\0';
session = (struct vmcp_session *)file->private_data;
if (down_interruptible(&session->mutex))
return -ERESTARTSYS;
if (!session->response)
session->response = (char *)__get_free_pages(GFP_KERNEL
| __GFP_REPEAT | GFP_DMA,
get_order(session->bufsize));
if (!session->response) {
up(&session->mutex);
kfree(cmd);
return -ENOMEM;
}
debug_text_event(vmcp_debug, 1, cmd);
session->resp_size = cpcmd(cmd, session->response,
session->bufsize,
&session->resp_code);
up(&session->mutex);
kfree(cmd);
*ppos = 0; /* reset the file pointer after a command */
return count;
}
/*
* These ioctls are available, as the semantics of the diagnose 8 call
* does not fit very well into a Linux call. Diagnose X'08' is described in
* CP Programming Services SC24-6084-00
*
* VMCP_GETCODE: gives the CP return code back to user space
* VMCP_SETBUF: sets the response buffer for the next write call. diagnose 8
* expects adjacent pages in real storage and to make matters worse, we
* dont know the size of the response. Therefore we default to PAGESIZE and
* let userspace to change the response size, if userspace expects a bigger
* response
*/
static long vmcp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
struct vmcp_session *session;
int temp;
session = (struct vmcp_session *)file->private_data;
if (down_interruptible(&session->mutex))
return -ERESTARTSYS;
switch (cmd) {
case VMCP_GETCODE:
temp = session->resp_code;
up(&session->mutex);
return put_user(temp, (int __user *)arg);
case VMCP_SETBUF:
free_pages((unsigned long)session->response,
get_order(session->bufsize));
session->response=NULL;
temp = get_user(session->bufsize, (int __user *)arg);
if (get_order(session->bufsize) > 8) {
session->bufsize = PAGE_SIZE;
temp = -EINVAL;
}
up(&session->mutex);
return temp;
case VMCP_GETSIZE:
temp = session->resp_size;
up(&session->mutex);
return put_user(temp, (int __user *)arg);
default:
up(&session->mutex);
return -ENOIOCTLCMD;
}
}
static struct file_operations vmcp_fops = {
.owner = THIS_MODULE,
.open = &vmcp_open,
.release = &vmcp_release,
.read = &vmcp_read,
.llseek = &no_llseek,
.write = &vmcp_write,
.unlocked_ioctl = &vmcp_ioctl,
.compat_ioctl = &vmcp_ioctl
};
static struct miscdevice vmcp_dev = {
.name = "vmcp",
.minor = MISC_DYNAMIC_MINOR,
.fops = &vmcp_fops,
};
static int __init vmcp_init(void)
{
int ret;
if (!MACHINE_IS_VM) {
printk(KERN_WARNING
"z/VM CP interface is only available under z/VM\n");
return -ENODEV;
}
ret = misc_register(&vmcp_dev);
if (!ret)
printk(KERN_INFO "z/VM CP interface loaded\n");
else
printk(KERN_WARNING
"z/VM CP interface not loaded. Could not register misc device.\n");
vmcp_debug = debug_register("vmcp", 0, 1, 240);
debug_register_view(vmcp_debug, &debug_hex_ascii_view);
return ret;
}
static void __exit vmcp_exit(void)
{
WARN_ON(misc_deregister(&vmcp_dev) != 0);
debug_unregister(vmcp_debug);
printk(KERN_INFO "z/VM CP interface unloaded.\n");
}
module_init(vmcp_init);
module_exit(vmcp_exit);

30
drivers/s390/char/vmcp.h Normal file
View file

@ -0,0 +1,30 @@
/*
* Copyright (C) 2004, 2005 IBM Corporation
* Interface implementation for communication with the v/VM control program
* Version 1.0
* Author(s): Christian Borntraeger <cborntra@de.ibm.com>
*
*
* z/VMs CP offers the possibility to issue commands via the diagnose code 8
* this driver implements a character device that issues these commands and
* returns the answer of CP.
*
* The idea of this driver is based on cpint from Neale Ferguson
*/
#include <asm/semaphore.h>
#include <linux/ioctl.h>
#define VMCP_GETCODE _IOR(0x10, 1, int)
#define VMCP_SETBUF _IOW(0x10, 2, int)
#define VMCP_GETSIZE _IOR(0x10, 3, int)
struct vmcp_session {
unsigned int bufsize;
char *response;
int resp_size;
int resp_code;
/* As we use copy_from/to_user, which might *
* sleep and cannot use a spinlock */
struct semaphore mutex;
};

10
drivers/s390/char/vmlogrdr.c
View file

@ -236,7 +236,7 @@ vmlogrdr_get_recording_class_AB(void) {
int len,i;
printk (KERN_DEBUG "vmlogrdr: query command: %s\n", cp_command);
cpcmd(cp_command, cp_response, sizeof(cp_response));
cpcmd(cp_command, cp_response, sizeof(cp_response), NULL);
printk (KERN_DEBUG "vmlogrdr: response: %s", cp_response);
len = strnlen(cp_response,sizeof(cp_response));
// now the parsing
@ -288,7 +288,7 @@ vmlogrdr_recording(struct vmlogrdr_priv_t * logptr, int action, int purge) {
printk (KERN_DEBUG "vmlogrdr: recording command: %s\n",
cp_command);
cpcmd(cp_command, cp_response, sizeof(cp_response));
cpcmd(cp_command, cp_response, sizeof(cp_response), NULL);
printk (KERN_DEBUG "vmlogrdr: recording response: %s",
cp_response);
}
@ -301,7 +301,7 @@ vmlogrdr_recording(struct vmlogrdr_priv_t * logptr, int action, int purge) {
qid_string);
printk (KERN_DEBUG "vmlogrdr: recording command: %s\n", cp_command);
cpcmd(cp_command, cp_response, sizeof(cp_response));
cpcmd(cp_command, cp_response, sizeof(cp_response), NULL);
printk (KERN_DEBUG "vmlogrdr: recording response: %s",
cp_response);
/* The recording command will usually answer with 'Command complete'
@ -607,7 +607,7 @@ vmlogrdr_purge_store(struct device * dev, struct device_attribute *attr, const c
priv->recording_name);
printk (KERN_DEBUG "vmlogrdr: recording command: %s\n", cp_command);
cpcmd(cp_command, cp_response, sizeof(cp_response));
cpcmd(cp_command, cp_response, sizeof(cp_response), NULL);
printk (KERN_DEBUG "vmlogrdr: recording response: %s",
cp_response);
@ -682,7 +682,7 @@ vmlogrdr_recording_status_show(struct device_driver *driver, char *buf) {
char cp_command[] = "QUERY RECORDING ";
int len;
cpcmd(cp_command, buf, 4096);
cpcmd(cp_command, buf, 4096, NULL);
len = strlen(buf);
return len;
}

4
drivers/s390/net/smsgiucv.c
View file

@ -138,7 +138,7 @@ static void __exit
smsg_exit(void)
{
if (smsg_handle > 0) {
cpcmd("SET SMSG OFF", 0, 0);
cpcmd("SET SMSG OFF", NULL, 0, NULL);
iucv_sever(smsg_pathid, 0);
iucv_unregister_program(smsg_handle);
driver_unregister(&smsg_driver);
@ -177,7 +177,7 @@ smsg_init(void)
smsg_handle = 0;
return -EIO;
}
cpcmd("SET SMSG IUCV", 0, 0);
cpcmd("SET SMSG IUCV", NULL, 0, NULL);
return 0;
}

18
include/asm-s390/cpcmd.h
View file

@ -11,14 +11,28 @@
#define __CPCMD__
/*
* the lowlevel function for cpcmd
* the caller of __cpcmd has to ensure that the response buffer is below 2 GB
*/
extern void __cpcmd(char *cmd, char *response, int rlen);
extern int __cpcmd(const char *cmd, char *response, int rlen, int *response_code);
#ifndef __s390x__
#define cpcmd __cpcmd
#else
extern void cpcmd(char *cmd, char *response, int rlen);
/*
* cpcmd is the in-kernel interface for issuing CP commands
*
* cmd: null-terminated command string, max 240 characters
* response: response buffer for VM's textual response
* rlen: size of the response buffer, cpcmd will not exceed this size
* but will cap the output, if its too large. Everything that
* did not fit into the buffer will be silently dropped
* response_code: return pointer for VM's error code
* return value: the size of the response. The caller can check if the buffer
* was large enough by comparing the return value and rlen
* NOTE: If the response buffer is not below 2 GB, cpcmd can sleep
*/
extern int cpcmd(const char *cmd, char *response, int rlen, int *response_code);
#endif /*__s390x__*/
#endif