[patch 2/3] s390: add vmcp interface.

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Date:	Thu, 23 Jun 2005 19:06:51 +0200
To: akpm@osdl.org, cborntra@de.ibm.com, linux-kernel@vger.kernel.org

[patch 2/3] s390: add vmcp interface.

From: Christian Borntraeger <cborntra@de.ibm.com>

Add interface to issue VM control program commands.

Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diffstat:
 arch/s390/defconfig | 1
 arch/s390/kernel/cpcmd.c | 109 ++++++++++++---------
 arch/s390/kernel/setup.c | 6 -
 arch/s390/kernel/smp.c | 6 -
 arch/s390/kernel/traps.c | 2
 arch/s390/mm/extmem.c | 4
 drivers/s390/Kconfig | 7 +
 drivers/s390/char/Makefile | 1
 drivers/s390/char/con3215.c | 4
 drivers/s390/char/con3270.c | 4
 drivers/s390/char/vmcp.c | 219 +++++++++++++++++++++++++++++++++++++++++++
 drivers/s390/char/vmcp.h | 30 +++++
 drivers/s390/char/vmlogrdr.c | 10 -
 drivers/s390/net/smsgiucv.c | 4
 include/asm-s390/cpcmd.h | 18 +++
 15 files changed, 359 insertions(+), 66 deletions(-)

diff -urpN linux-2.6/arch/s390/defconfig linux-2.6-patched/arch/s390/defconfig
--- linux-2.6/arch/s390/defconfig 2005-06-23 18:57:54.000000000 +0200
+++ linux-2.6-patched/arch/s390/defconfig 2005-06-23 18:57:54.000000000 +0200
@@ -254,6 +254,7 @@ 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
 
diff -urpN linux-2.6/arch/s390/kernel/cpcmd.c linux-2.6-patched/arch/s390/kernel/cpcmd.c
--- linux-2.6/arch/s390/kernel/cpcmd.c 2005-06-17 21:48:29.000000000 +0200
+++ linux-2.6-patched/arch/s390/kernel/cpcmd.c 2005-06-23 18:57:54.000000000 +0200
@@ -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);
diff -urpN linux-2.6/arch/s390/kernel/setup.c linux-2.6-patched/arch/s390/kernel/setup.c
--- linux-2.6/arch/s390/kernel/setup.c 2005-06-23 18:57:54.000000000 +0200
+++ linux-2.6-patched/arch/s390/kernel/setup.c 2005-06-23 18:57:54.000000000 +0200
@@ -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;
diff -urpN linux-2.6/arch/s390/kernel/smp.c linux-2.6-patched/arch/s390/kernel/smp.c
--- linux-2.6/arch/s390/kernel/smp.c 2005-06-23 18:57:54.000000000 +0200
+++ linux-2.6-patched/arch/s390/kernel/smp.c 2005-06-23 18:57:54.000000000 +0200
@@ -284,7 +284,7 @@ static void do_machine_restart(void * __
          * 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 * __unu
         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 *
         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);
         }
diff -urpN linux-2.6/arch/s390/kernel/traps.c linux-2.6-patched/arch/s390/kernel/traps.c
--- linux-2.6/arch/s390/kernel/traps.c 2005-06-23 18:57:44.000000000 +0200
+++ linux-2.6-patched/arch/s390/kernel/traps.c 2005-06-23 18:57:54.000000000 +0200
@@ -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
         }
 }
diff -urpN linux-2.6/arch/s390/mm/extmem.c linux-2.6-patched/arch/s390/mm/extmem.c
--- linux-2.6/arch/s390/mm/extmem.c 2005-06-17 21:48:29.000000000 +0200
+++ linux-2.6-patched/arch/s390/mm/extmem.c 2005-06-23 18:57:54.000000000 +0200
@@ -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);
 }
 
diff -urpN linux-2.6/drivers/s390/char/con3215.c linux-2.6-patched/drivers/s390/char/con3215.c
--- linux-2.6/drivers/s390/char/con3215.c 2005-06-17 21:48:29.000000000 +0200
+++ linux-2.6-patched/drivers/s390/char/con3215.c 2005-06-23 18:57:54.000000000 +0200
@@ -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 */
diff -urpN linux-2.6/drivers/s390/char/con3270.c linux-2.6-patched/drivers/s390/char/con3270.c
--- linux-2.6/drivers/s390/char/con3270.c 2005-06-17 21:48:29.000000000 +0200
+++ linux-2.6-patched/drivers/s390/char/con3270.c 2005-06-23 18:57:54.000000000 +0200
@@ -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();
diff -urpN linux-2.6/drivers/s390/char/Makefile linux-2.6-patched/drivers/s390/char/Makefile
--- linux-2.6/drivers/s390/char/Makefile 2005-06-17 21:48:29.000000000 +0200
+++ linux-2.6-patched/drivers/s390/char/Makefile 2005-06-23 18:57:54.000000000 +0200
@@ -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
diff -urpN linux-2.6/drivers/s390/char/vmcp.c linux-2.6-patched/drivers/s390/char/vmcp.c
--- linux-2.6/drivers/s390/char/vmcp.c 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6-patched/drivers/s390/char/vmcp.c 2005-06-23 18:57:54.000000000 +0200
@@ -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);
diff -urpN linux-2.6/drivers/s390/char/vmcp.h linux-2.6-patched/drivers/s390/char/vmcp.h
--- linux-2.6/drivers/s390/char/vmcp.h 1970-01-01 01:00:00.000000000 +0100
+++ linux-2.6-patched/drivers/s390/char/vmcp.h 2005-06-23 18:57:54.000000000 +0200
@@ -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;
+};
diff -urpN linux-2.6/drivers/s390/char/vmlogrdr.c linux-2.6-patched/drivers/s390/char/vmlogrdr.c
--- linux-2.6/drivers/s390/char/vmlogrdr.c 2005-06-23 18:57:45.000000000 +0200
+++ linux-2.6-patched/drivers/s390/char/vmlogrdr.c 2005-06-23 18:57:54.000000000 +0200
@@ -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_
 
                 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_
                 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
                          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 de
         char cp_command[] = "QUERY RECORDING ";
         int len;
 
- cpcmd(cp_command, buf, 4096);
+ cpcmd(cp_command, buf, 4096, NULL);
         len = strlen(buf);
         return len;
 }
diff -urpN linux-2.6/drivers/s390/Kconfig linux-2.6-patched/drivers/s390/Kconfig
--- linux-2.6/drivers/s390/Kconfig 2005-06-17 21:48:29.000000000 +0200
+++ linux-2.6-patched/drivers/s390/Kconfig 2005-06-23 18:57:54.000000000 +0200
@@ -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
diff -urpN linux-2.6/drivers/s390/net/smsgiucv.c linux-2.6-patched/drivers/s390/net/smsgiucv.c
--- linux-2.6/drivers/s390/net/smsgiucv.c 2005-06-17 21:48:29.000000000 +0200
+++ linux-2.6-patched/drivers/s390/net/smsgiucv.c 2005-06-23 18:57:54.000000000 +0200
@@ -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;
 }
 
diff -urpN linux-2.6/include/asm-s390/cpcmd.h linux-2.6-patched/include/asm-s390/cpcmd.h
--- linux-2.6/include/asm-s390/cpcmd.h 2005-06-17 21:48:29.000000000 +0200
+++ linux-2.6-patched/include/asm-s390/cpcmd.h 2005-06-23 18:57:54.000000000 +0200
@@ -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
-
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