[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>

4 files changed, 72 insertions, 51 deletions

diff --git a/arch/s390/kernel/cpcmd.c b/arch/s390/kernel/cpcmd.c
index 44df8dc07c59..20062145e84e 100644
--- a/arch/s390/kernel/cpcmd.c
+++ b/arch/s390/kernel/cpcmd.c
@@ -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 --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index eb7be0ad7175..b6d740ac0e6e 100644
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -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 --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c
index 50c335067cfe..642572a8e334 100644
--- a/arch/s390/kernel/smp.c
+++ b/arch/s390/kernel/smp.c
@@ -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);
 	}
diff --git a/arch/s390/kernel/traps.c b/arch/s390/kernel/traps.c
index ca34b6f34b38..bc7b7be7acbe 100644
--- a/arch/s390/kernel/traps.c
+++ b/arch/s390/kernel/traps.c
@@ -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
 	}
 }