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[PATCH] s390: add vmcp interface 

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
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

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