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authorChristian Borntraeger <cborntra@de.ibm.com>2005-06-25 17:55:32 -0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-06-25 19:24:37 -0400
commit6b979de395c7e1b7e59f74a870e1d1911853eccb (patch)
tree82502e9e93c977b0f812d017f5d8d4e12436c6c8
parent77fa22450de00d535de2cc8be653983560828000 (diff)
[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>
Diffstat
-rw-r--r--arch/s390/defconfig1
-rw-r--r--arch/s390/kernel/cpcmd.c109
-rw-r--r--arch/s390/kernel/setup.c6
-rw-r--r--arch/s390/kernel/smp.c6
-rw-r--r--arch/s390/kernel/traps.c2
-rw-r--r--arch/s390/mm/extmem.c4
-rw-r--r--drivers/s390/Kconfig7
-rw-r--r--drivers/s390/char/Makefile1
-rw-r--r--drivers/s390/char/con3215.c4
-rw-r--r--drivers/s390/char/con3270.c4
-rw-r--r--drivers/s390/char/vmcp.c219
-rw-r--r--drivers/s390/char/vmcp.h30
-rw-r--r--drivers/s390/char/vmlogrdr.c10
-rw-r--r--drivers/s390/net/smsgiucv.c4
-rw-r--r--include/asm-s390/cpcmd.h18
15 files changed, 359 insertions, 66 deletions
diff --git a/arch/s390/defconfig b/arch/s390/defconfig
index 07fd0414a4bf..89850b2c27ea 100644
--- a/arch/s390/defconfig
+++ b/arch/s390/defconfig
@@ -245,6 +245,7 @@ CONFIG_S390_TAPE_BLOCK=y
245# 245#
246CONFIG_S390_TAPE_34XX=m 246CONFIG_S390_TAPE_34XX=m
247# CONFIG_VMLOGRDR is not set 247# CONFIG_VMLOGRDR is not set
248# CONFIG_VMCP is not set
248# CONFIG_MONREADER is not set 249# CONFIG_MONREADER is not set
249# CONFIG_DCSS_SHM is not set 250# CONFIG_DCSS_SHM is not set
250 251
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 @@
2 * arch/s390/kernel/cpcmd.c 2 * arch/s390/kernel/cpcmd.c
3 * 3 *
4 * S390 version 4 * S390 version
5 * Copyright (C) 1999,2000 IBM Deutschland Entwicklung GmbH, IBM Corporation 5 * Copyright (C) 1999,2005 IBM Deutschland Entwicklung GmbH, IBM Corporation
6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com), 6 * Author(s): Martin Schwidefsky (schwidefsky@de.ibm.com),
7 * Christian Borntraeger (cborntra@de.ibm.com), 7 * Christian Borntraeger (cborntra@de.ibm.com),
8 */ 8 */
@@ -18,93 +18,114 @@
18#include <asm/system.h> 18#include <asm/system.h>
19 19
20static DEFINE_SPINLOCK(cpcmd_lock); 20static DEFINE_SPINLOCK(cpcmd_lock);
21static char cpcmd_buf[240]; 21static char cpcmd_buf[241];
22 22
23/* 23/*
24 * the caller of __cpcmd has to ensure that the response buffer is below 2 GB 24 * the caller of __cpcmd has to ensure that the response buffer is below 2 GB
25 */ 25 */
26void __cpcmd(char *cmd, char *response, int rlen) 26int __cpcmd(const char *cmd, char *response, int rlen, int *response_code)
27{ 27{
28 const int mask = 0x40000000L; 28 const int mask = 0x40000000L;
29 unsigned long flags; 29 unsigned long flags;
30 int return_code;
31 int return_len;
30 int cmdlen; 32 int cmdlen;
31 33
32 spin_lock_irqsave(&cpcmd_lock, flags); 34 spin_lock_irqsave(&cpcmd_lock, flags);
33 cmdlen = strlen(cmd); 35 cmdlen = strlen(cmd);
34 BUG_ON(cmdlen > 240); 36 BUG_ON(cmdlen > 240);
35 strcpy(cpcmd_buf, cmd); 37 memcpy(cpcmd_buf, cmd, cmdlen);
36 ASCEBC(cpcmd_buf, cmdlen); 38 ASCEBC(cpcmd_buf, cmdlen);
37 39
38 if (response != NULL && rlen > 0) { 40 if (response != NULL && rlen > 0) {
39 memset(response, 0, rlen); 41 memset(response, 0, rlen);
40#ifndef CONFIG_ARCH_S390X 42#ifndef CONFIG_ARCH_S390X
41 asm volatile ("LRA 2,0(%0)\n\t" 43 asm volatile ( "lra 2,0(%2)\n"
42 "LR 4,%1\n\t" 44 "lr 4,%3\n"
43 "O 4,%4\n\t" 45 "o 4,%6\n"
44 "LRA 3,0(%2)\n\t" 46 "lra 3,0(%4)\n"
45 "LR 5,%3\n\t" 47 "lr 5,%5\n"
46 ".long 0x83240008 # Diagnose X'08'\n\t" 48 "diag 2,4,0x8\n"
47 : /* no output */ 49 "brc 8, .Litfits\n"
48 : "a" (cpcmd_buf), "d" (cmdlen), 50 "ar 5, %5\n"
49 "a" (response), "d" (rlen), "m" (mask) 51 ".Litfits: \n"
50 : "cc", "2", "3", "4", "5" ); 52 "lr %0,4\n"
53 "lr %1,5\n"
54 : "=d" (return_code), "=d" (return_len)
55 : "a" (cpcmd_buf), "d" (cmdlen),
56 "a" (response), "d" (rlen), "m" (mask)
57 : "cc", "2", "3", "4", "5" );
51#else /* CONFIG_ARCH_S390X */ 58#else /* CONFIG_ARCH_S390X */
52 asm volatile (" lrag 2,0(%0)\n" 59 asm volatile ( "lrag 2,0(%2)\n"
53 " lgr 4,%1\n" 60 "lgr 4,%3\n"
54 " o 4,%4\n" 61 "o 4,%6\n"
55 " lrag 3,0(%2)\n" 62 "lrag 3,0(%4)\n"
56 " lgr 5,%3\n" 63 "lgr 5,%5\n"
57 " sam31\n" 64 "sam31\n"
58 " .long 0x83240008 # Diagnose X'08'\n" 65 "diag 2,4,0x8\n"
59 " sam64" 66 "sam64\n"
60 : /* no output */ 67 "brc 8, .Litfits\n"
61 : "a" (cpcmd_buf), "d" (cmdlen), 68 "agr 5, %5\n"
62 "a" (response), "d" (rlen), "m" (mask) 69 ".Litfits: \n"
63 : "cc", "2", "3", "4", "5" ); 70 "lgr %0,4\n"
71 "lgr %1,5\n"
72 : "=d" (return_code), "=d" (return_len)
73 : "a" (cpcmd_buf), "d" (cmdlen),
74 "a" (response), "d" (rlen), "m" (mask)
75 : "cc", "2", "3", "4", "5" );
64#endif /* CONFIG_ARCH_S390X */ 76#endif /* CONFIG_ARCH_S390X */
65 EBCASC(response, rlen); 77 EBCASC(response, rlen);
66 } else { 78 } else {
79 return_len = 0;
67#ifndef CONFIG_ARCH_S390X 80#ifndef CONFIG_ARCH_S390X
68 asm volatile ("LRA 2,0(%0)\n\t" 81 asm volatile ( "lra 2,0(%1)\n"
69 "LR 3,%1\n\t" 82 "lr 3,%2\n"
70 ".long 0x83230008 # Diagnose X'08'\n\t" 83 "diag 2,3,0x8\n"
71 : /* no output */ 84 "lr %0,3\n"
72 : "a" (cpcmd_buf), "d" (cmdlen) 85 : "=d" (return_code)
73 : "2", "3" ); 86 : "a" (cpcmd_buf), "d" (cmdlen)
87 : "2", "3" );
74#else /* CONFIG_ARCH_S390X */ 88#else /* CONFIG_ARCH_S390X */
75 asm volatile (" lrag 2,0(%0)\n" 89 asm volatile ( "lrag 2,0(%1)\n"
76 " lgr 3,%1\n" 90 "lgr 3,%2\n"
77 " sam31\n" 91 "sam31\n"
78 " .long 0x83230008 # Diagnose X'08'\n" 92 "diag 2,3,0x8\n"
79 " sam64" 93 "sam64\n"
80 : /* no output */ 94 "lgr %0,3\n"
81 : "a" (cpcmd_buf), "d" (cmdlen) 95 : "=d" (return_code)
82 : "2", "3" ); 96 : "a" (cpcmd_buf), "d" (cmdlen)
97 : "2", "3" );
83#endif /* CONFIG_ARCH_S390X */ 98#endif /* CONFIG_ARCH_S390X */
84 } 99 }
85 spin_unlock_irqrestore(&cpcmd_lock, flags); 100 spin_unlock_irqrestore(&cpcmd_lock, flags);
101 if (response_code != NULL)
102 *response_code = return_code;
103 return return_len;
86} 104}
87 105
88EXPORT_SYMBOL(__cpcmd); 106EXPORT_SYMBOL(__cpcmd);
89 107
90#ifdef CONFIG_ARCH_S390X 108#ifdef CONFIG_ARCH_S390X
91void cpcmd(char *cmd, char *response, int rlen) 109int cpcmd(const char *cmd, char *response, int rlen, int *response_code)
92{ 110{
93 char *lowbuf; 111 char *lowbuf;
112 int len;
113
94 if ((rlen == 0) || (response == NULL) 114 if ((rlen == 0) || (response == NULL)
95 || !((unsigned long)response >> 31)) 115 || !((unsigned long)response >> 31))
96 __cpcmd(cmd, response, rlen); 116 len = __cpcmd(cmd, response, rlen, response_code);
97 else { 117 else {
98 lowbuf = kmalloc(rlen, GFP_KERNEL | GFP_DMA); 118 lowbuf = kmalloc(rlen, GFP_KERNEL | GFP_DMA);
99 if (!lowbuf) { 119 if (!lowbuf) {
100 printk(KERN_WARNING 120 printk(KERN_WARNING
101 "cpcmd: could not allocate response buffer\n"); 121 "cpcmd: could not allocate response buffer\n");
102 return; 122 return -ENOMEM;
103 } 123 }
104 __cpcmd(cmd, lowbuf, rlen); 124 len = __cpcmd(cmd, lowbuf, rlen, response_code);
105 memcpy(response, lowbuf, rlen); 125 memcpy(response, lowbuf, rlen);
106 kfree(lowbuf); 126 kfree(lowbuf);
107 } 127 }
128 return len;
108} 129}
109 130
110EXPORT_SYMBOL(cpcmd); 131EXPORT_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)
198 char *ptr; 198 char *ptr;
199 199
200 if (MACHINE_IS_VM) { 200 if (MACHINE_IS_VM) {
201 __cpcmd("QUERY CONSOLE", query_buffer, 1024); 201 __cpcmd("QUERY CONSOLE", query_buffer, 1024, NULL);
202 console_devno = simple_strtoul(query_buffer + 5, NULL, 16); 202 console_devno = simple_strtoul(query_buffer + 5, NULL, 16);
203 ptr = strstr(query_buffer, "SUBCHANNEL ="); 203 ptr = strstr(query_buffer, "SUBCHANNEL =");
204 console_irq = simple_strtoul(ptr + 13, NULL, 16); 204 console_irq = simple_strtoul(ptr + 13, NULL, 16);
205 __cpcmd("QUERY TERM", query_buffer, 1024); 205 __cpcmd("QUERY TERM", query_buffer, 1024, NULL);
206 ptr = strstr(query_buffer, "CONMODE"); 206 ptr = strstr(query_buffer, "CONMODE");
207 /* 207 /*
208 * Set the conmode to 3215 so that the device recognition 208 * Set the conmode to 3215 so that the device recognition
@@ -211,7 +211,7 @@ static void __init conmode_default(void)
211 * 3215 and the 3270 driver will try to access the console 211 * 3215 and the 3270 driver will try to access the console
212 * device (3215 as console and 3270 as normal tty). 212 * device (3215 as console and 3270 as normal tty).
213 */ 213 */
214 __cpcmd("TERM CONMODE 3215", NULL, 0); 214 __cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
215 if (ptr == NULL) { 215 if (ptr == NULL) {
216#if defined(CONFIG_SCLP_CONSOLE) 216#if defined(CONFIG_SCLP_CONSOLE)
217 SET_CONSOLE_SCLP; 217 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)
284 * locks are always held disabled). 284 * locks are always held disabled).
285 */ 285 */
286 if (MACHINE_IS_VM) 286 if (MACHINE_IS_VM)
287 cpcmd ("IPL", NULL, 0); 287 cpcmd ("IPL", NULL, 0, NULL);
288 else 288 else
289 reipl (0x10000 | S390_lowcore.ipl_device); 289 reipl (0x10000 | S390_lowcore.ipl_device);
290} 290}
@@ -313,7 +313,7 @@ static void do_machine_halt(void * __unused)
313 if (atomic_compare_and_swap(-1, smp_processor_id(), &cpuid) == 0) { 313 if (atomic_compare_and_swap(-1, smp_processor_id(), &cpuid) == 0) {
314 smp_send_stop(); 314 smp_send_stop();
315 if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0) 315 if (MACHINE_IS_VM && strlen(vmhalt_cmd) > 0)
316 cpcmd(vmhalt_cmd, NULL, 0); 316 cpcmd(vmhalt_cmd, NULL, 0, NULL);
317 signal_processor(smp_processor_id(), 317 signal_processor(smp_processor_id(),
318 sigp_stop_and_store_status); 318 sigp_stop_and_store_status);
319 } 319 }
@@ -332,7 +332,7 @@ static void do_machine_power_off(void * __unused)
332 if (atomic_compare_and_swap(-1, smp_processor_id(), &cpuid) == 0) { 332 if (atomic_compare_and_swap(-1, smp_processor_id(), &cpuid) == 0) {
333 smp_send_stop(); 333 smp_send_stop();
334 if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0) 334 if (MACHINE_IS_VM && strlen(vmpoff_cmd) > 0)
335 cpcmd(vmpoff_cmd, NULL, 0); 335 cpcmd(vmpoff_cmd, NULL, 0, NULL);
336 signal_processor(smp_processor_id(), 336 signal_processor(smp_processor_id(),
337 sigp_stop_and_store_status); 337 sigp_stop_and_store_status);
338 } 338 }
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)
735 &ext_int_pfault); 735 &ext_int_pfault);
736#endif 736#endif
737#ifndef CONFIG_ARCH_S390X 737#ifndef CONFIG_ARCH_S390X
738 cpcmd("SET PAGEX ON", NULL, 0); 738 cpcmd("SET PAGEX ON", NULL, 0, NULL);
739#endif 739#endif
740 } 740 }
741} 741}
diff --git a/arch/s390/mm/extmem.c b/arch/s390/mm/extmem.c
index 648deed17e25..c5348108ca3c 100644
--- a/arch/s390/mm/extmem.c
+++ b/arch/s390/mm/extmem.c
@@ -576,8 +576,8 @@ segment_save(char *name)
576 segtype_string[seg->range[i].start & 0xff]); 576 segtype_string[seg->range[i].start & 0xff]);
577 } 577 }
578 sprintf(cmd2, "SAVESEG %s", name); 578 sprintf(cmd2, "SAVESEG %s", name);
579 cpcmd(cmd1, NULL, 0); 579 cpcmd(cmd1, NULL, 0, NULL);
580 cpcmd(cmd2, NULL, 0); 580 cpcmd(cmd2, NULL, 0, NULL);
581 spin_unlock(&dcss_lock); 581 spin_unlock(&dcss_lock);
582} 582}
583 583
diff --git a/drivers/s390/Kconfig b/drivers/s390/Kconfig
index 96413c2cd1ad..a86a650f3d6d 100644
--- a/drivers/s390/Kconfig
+++ b/drivers/s390/Kconfig
@@ -187,6 +187,13 @@ config VMLOGRDR
187 *SYMPTOM. 187 *SYMPTOM.
188 This driver depends on the IUCV support driver. 188 This driver depends on the IUCV support driver.
189 189
190config VMCP
191 tristate "Support for the z/VM CP interface (VM only)"
192 help
193 Select this option if you want to be able to interact with the control
194 program on z/VM
195
196
190config MONREADER 197config MONREADER
191 tristate "API for reading z/VM monitor service records" 198 tristate "API for reading z/VM monitor service records"
192 depends on IUCV 199 depends on IUCV
diff --git a/drivers/s390/char/Makefile b/drivers/s390/char/Makefile
index 14e8cce9f862..6377a96735df 100644
--- a/drivers/s390/char/Makefile
+++ b/drivers/s390/char/Makefile
@@ -19,6 +19,7 @@ obj-$(CONFIG_SCLP_CPI) += sclp_cpi.o
19 19
20obj-$(CONFIG_ZVM_WATCHDOG) += vmwatchdog.o 20obj-$(CONFIG_ZVM_WATCHDOG) += vmwatchdog.o
21obj-$(CONFIG_VMLOGRDR) += vmlogrdr.o 21obj-$(CONFIG_VMLOGRDR) += vmlogrdr.o
22obj-$(CONFIG_VMCP) += vmcp.o
22 23
23tape-$(CONFIG_S390_TAPE_BLOCK) += tape_block.o 24tape-$(CONFIG_S390_TAPE_BLOCK) += tape_block.o
24tape-$(CONFIG_PROC_FS) += tape_proc.o 25tape-$(CONFIG_PROC_FS) += tape_proc.o
diff --git a/drivers/s390/char/con3215.c b/drivers/s390/char/con3215.c
index 022f17bff731..f11a67fda40e 100644
--- a/drivers/s390/char/con3215.c
+++ b/drivers/s390/char/con3215.c
@@ -860,8 +860,8 @@ con3215_init(void)
860 860
861 /* Set the console mode for VM */ 861 /* Set the console mode for VM */
862 if (MACHINE_IS_VM) { 862 if (MACHINE_IS_VM) {
863 cpcmd("TERM CONMODE 3215", NULL, 0); 863 cpcmd("TERM CONMODE 3215", NULL, 0, NULL);
864 cpcmd("TERM AUTOCR OFF", NULL, 0); 864 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
865 } 865 }
866 866
867 /* allocate 3215 request structures */ 867 /* allocate 3215 request structures */
diff --git a/drivers/s390/char/con3270.c b/drivers/s390/char/con3270.c
index d52fb57a6b19..fc7a213e591f 100644
--- a/drivers/s390/char/con3270.c
+++ b/drivers/s390/char/con3270.c
@@ -591,8 +591,8 @@ con3270_init(void)
591 591
592 /* Set the console mode for VM */ 592 /* Set the console mode for VM */
593 if (MACHINE_IS_VM) { 593 if (MACHINE_IS_VM) {
594 cpcmd("TERM CONMODE 3270", 0, 0); 594 cpcmd("TERM CONMODE 3270", NULL, 0, NULL);
595 cpcmd("TERM AUTOCR OFF", 0, 0); 595 cpcmd("TERM AUTOCR OFF", NULL, 0, NULL);
596 } 596 }
597 597
598 cdev = ccw_device_probe_console(); 598 cdev = ccw_device_probe_console();
diff --git a/drivers/s390/char/vmcp.c b/drivers/s390/char/vmcp.c
new file mode 100644
index 000000000000..dfbbf235ca2b
--- /dev/null
+++ b/drivers/s390/char/vmcp.c
@@ -0,0 +1,219 @@
1/*
2 * Copyright (C) 2004,2005 IBM Corporation
3 * Interface implementation for communication with the v/VM control program
4 * Author(s): Christian Borntraeger <cborntra@de.ibm.com>
5 *
6 *
7 * z/VMs CP offers the possibility to issue commands via the diagnose code 8
8 * this driver implements a character device that issues these commands and
9 * returns the answer of CP.
10
11 * The idea of this driver is based on cpint from Neale Ferguson and #CP in CMS
12 */
13
14#include <linux/fs.h>
15#include <linux/init.h>
16#include <linux/kernel.h>
17#include <linux/miscdevice.h>
18#include <linux/module.h>
19#include <asm/cpcmd.h>
20#include <asm/debug.h>
21#include <asm/uaccess.h>
22#include "vmcp.h"
23
24MODULE_LICENSE("GPL");
25MODULE_AUTHOR("Christian Borntraeger <cborntra@de.ibm.com>");
26MODULE_DESCRIPTION("z/VM CP interface");
27
28static debug_info_t *vmcp_debug;
29
30static int vmcp_open(struct inode *inode, struct file *file)
31{
32 struct vmcp_session *session;
33
34 if (!capable(CAP_SYS_ADMIN))
35 return -EPERM;
36
37 session = kmalloc(sizeof(*session), GFP_KERNEL);
38 if (!session)
39 return -ENOMEM;
40 session->bufsize = PAGE_SIZE;
41 session->response = NULL;
42 session->resp_size = 0;
43 init_MUTEX(&session->mutex);
44 file->private_data = session;
45 return nonseekable_open(inode, file);
46}
47
48static int vmcp_release(struct inode *inode, struct file *file)
49{
50 struct vmcp_session *session;
51
52 session = (struct vmcp_session *)file->private_data;
53 file->private_data = NULL;
54 free_pages((unsigned long)session->response, get_order(session->bufsize));
55 kfree(session);
56 return 0;
57}
58
59static ssize_t
60vmcp_read(struct file *file, char __user * buff, size_t count, loff_t * ppos)
61{
62 size_t tocopy;
63 struct vmcp_session *session;
64
65 session = (struct vmcp_session *)file->private_data;
66 if (down_interruptible(&session->mutex))
67 return -ERESTARTSYS;
68 if (!session->response) {
69 up(&session->mutex);
70 return 0;
71 }
72 if (*ppos > session->resp_size) {
73 up(&session->mutex);
74 return 0;
75 }
76 tocopy = min(session->resp_size - (size_t) (*ppos), count);
77 tocopy = min(tocopy,session->bufsize - (size_t) (*ppos));
78
79 if (copy_to_user(buff, session->response + (*ppos), tocopy)) {
80 up(&session->mutex);
81 return -EFAULT;
82 }
83 up(&session->mutex);
84 *ppos += tocopy;
85 return tocopy;
86}
87
88static ssize_t
89vmcp_write(struct file *file, const char __user * buff, size_t count,
90 loff_t * ppos)
91{
92 char *cmd;
93 struct vmcp_session *session;
94
95 if (count > 240)
96 return -EINVAL;
97 cmd = kmalloc(count + 1, GFP_KERNEL);
98 if (!cmd)
99 return -ENOMEM;
100 if (copy_from_user(cmd, buff, count)) {
101 kfree(cmd);
102 return -EFAULT;
103 }
104 cmd[count] = '\0';
105 session = (struct vmcp_session *)file->private_data;
106 if (down_interruptible(&session->mutex))
107 return -ERESTARTSYS;
108 if (!session->response)
109 session->response = (char *)__get_free_pages(GFP_KERNEL
110 | __GFP_REPEAT | GFP_DMA,
111 get_order(session->bufsize));
112 if (!session->response) {
113 up(&session->mutex);
114 kfree(cmd);
115 return -ENOMEM;
116 }
117 debug_text_event(vmcp_debug, 1, cmd);
118 session->resp_size = cpcmd(cmd, session->response,
119 session->bufsize,
120 &session->resp_code);
121 up(&session->mutex);
122 kfree(cmd);
123 *ppos = 0; /* reset the file pointer after a command */
124 return count;
125}
126
127
128/*
129 * These ioctls are available, as the semantics of the diagnose 8 call
130 * does not fit very well into a Linux call. Diagnose X'08' is described in
131 * CP Programming Services SC24-6084-00
132 *
133 * VMCP_GETCODE: gives the CP return code back to user space
134 * VMCP_SETBUF: sets the response buffer for the next write call. diagnose 8
135 * expects adjacent pages in real storage and to make matters worse, we
136 * dont know the size of the response. Therefore we default to PAGESIZE and
137 * let userspace to change the response size, if userspace expects a bigger
138 * response
139 */
140static long vmcp_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
141{
142 struct vmcp_session *session;
143 int temp;
144
145 session = (struct vmcp_session *)file->private_data;
146 if (down_interruptible(&session->mutex))
147 return -ERESTARTSYS;
148 switch (cmd) {
149 case VMCP_GETCODE:
150 temp = session->resp_code;
151 up(&session->mutex);
152 return put_user(temp, (int __user *)arg);
153 case VMCP_SETBUF:
154 free_pages((unsigned long)session->response,
155 get_order(session->bufsize));
156 session->response=NULL;
157 temp = get_user(session->bufsize, (int __user *)arg);
158 if (get_order(session->bufsize) > 8) {
159 session->bufsize = PAGE_SIZE;
160 temp = -EINVAL;
161 }
162 up(&session->mutex);
163 return temp;
164 case VMCP_GETSIZE:
165 temp = session->resp_size;
166 up(&session->mutex);
167 return put_user(temp, (int __user *)arg);
168 default:
169 up(&session->mutex);
170 return -ENOIOCTLCMD;
171 }
172}
173
174static struct file_operations vmcp_fops = {
175 .owner = THIS_MODULE,
176 .open = &vmcp_open,
177 .release = &vmcp_release,
178 .read = &vmcp_read,
179 .llseek = &no_llseek,
180 .write = &vmcp_write,
181 .unlocked_ioctl = &vmcp_ioctl,
182 .compat_ioctl = &vmcp_ioctl
183};
184
185static struct miscdevice vmcp_dev = {
186 .name = "vmcp",
187 .minor = MISC_DYNAMIC_MINOR,
188 .fops = &vmcp_fops,
189};
190
191static int __init vmcp_init(void)
192{
193 int ret;
194
195 if (!MACHINE_IS_VM) {
196 printk(KERN_WARNING
197 "z/VM CP interface is only available under z/VM\n");
198 return -ENODEV;
199 }
200 ret = misc_register(&vmcp_dev);
201 if (!ret)
202 printk(KERN_INFO "z/VM CP interface loaded\n");
203 else
204 printk(KERN_WARNING
205 "z/VM CP interface not loaded. Could not register misc device.\n");
206 vmcp_debug = debug_register("vmcp", 0, 1, 240);
207 debug_register_view(vmcp_debug, &debug_hex_ascii_view);
208 return ret;
209}
210
211static void __exit vmcp_exit(void)
212{
213 WARN_ON(misc_deregister(&vmcp_dev) != 0);
214 debug_unregister(vmcp_debug);
215 printk(KERN_INFO "z/VM CP interface unloaded.\n");
216}
217
218module_init(vmcp_init);
219module_exit(vmcp_exit);
diff --git a/drivers/s390/char/vmcp.h b/drivers/s390/char/vmcp.h
new file mode 100644
index 000000000000..87389e730465
--- /dev/null
+++ b/drivers/s390/char/vmcp.h
@@ -0,0 +1,30 @@
1/*
2 * Copyright (C) 2004, 2005 IBM Corporation
3 * Interface implementation for communication with the v/VM control program
4 * Version 1.0
5 * Author(s): Christian Borntraeger <cborntra@de.ibm.com>
6 *
7 *
8 * z/VMs CP offers the possibility to issue commands via the diagnose code 8
9 * this driver implements a character device that issues these commands and
10 * returns the answer of CP.
11 *
12 * The idea of this driver is based on cpint from Neale Ferguson
13 */
14
15#include <asm/semaphore.h>
16#include <linux/ioctl.h>
17
18#define VMCP_GETCODE _IOR(0x10, 1, int)
19#define VMCP_SETBUF _IOW(0x10, 2, int)
20#define VMCP_GETSIZE _IOR(0x10, 3, int)
21
22struct vmcp_session {
23 unsigned int bufsize;
24 char *response;
25 int resp_size;
26 int resp_code;
27 /* As we use copy_from/to_user, which might *
28 * sleep and cannot use a spinlock */
29 struct semaphore mutex;
30};
diff --git a/drivers/s390/char/vmlogrdr.c b/drivers/s390/char/vmlogrdr.c
index f7717327d15e..491f00c032e8 100644
--- a/drivers/s390/char/vmlogrdr.c
+++ b/drivers/s390/char/vmlogrdr.c
@@ -236,7 +236,7 @@ vmlogrdr_get_recording_class_AB(void) {
236 int len,i; 236 int len,i;
237 237
238 printk (KERN_DEBUG "vmlogrdr: query command: %s\n", cp_command); 238 printk (KERN_DEBUG "vmlogrdr: query command: %s\n", cp_command);
239 cpcmd(cp_command, cp_response, sizeof(cp_response)); 239 cpcmd(cp_command, cp_response, sizeof(cp_response), NULL);
240 printk (KERN_DEBUG "vmlogrdr: response: %s", cp_response); 240 printk (KERN_DEBUG "vmlogrdr: response: %s", cp_response);
241 len = strnlen(cp_response,sizeof(cp_response)); 241 len = strnlen(cp_response,sizeof(cp_response));
242 // now the parsing 242 // now the parsing
@@ -288,7 +288,7 @@ vmlogrdr_recording(struct vmlogrdr_priv_t * logptr, int action, int purge) {
288 288
289 printk (KERN_DEBUG "vmlogrdr: recording command: %s\n", 289 printk (KERN_DEBUG "vmlogrdr: recording command: %s\n",
290 cp_command); 290 cp_command);
291 cpcmd(cp_command, cp_response, sizeof(cp_response)); 291 cpcmd(cp_command, cp_response, sizeof(cp_response), NULL);
292 printk (KERN_DEBUG "vmlogrdr: recording response: %s", 292 printk (KERN_DEBUG "vmlogrdr: recording response: %s",
293 cp_response); 293 cp_response);
294 } 294 }
@@ -301,7 +301,7 @@ vmlogrdr_recording(struct vmlogrdr_priv_t * logptr, int action, int purge) {
301 qid_string); 301 qid_string);
302 302
303 printk (KERN_DEBUG "vmlogrdr: recording command: %s\n", cp_command); 303 printk (KERN_DEBUG "vmlogrdr: recording command: %s\n", cp_command);
304 cpcmd(cp_command, cp_response, sizeof(cp_response)); 304 cpcmd(cp_command, cp_response, sizeof(cp_response), NULL);
305 printk (KERN_DEBUG "vmlogrdr: recording response: %s", 305 printk (KERN_DEBUG "vmlogrdr: recording response: %s",
306 cp_response); 306 cp_response);
307 /* The recording command will usually answer with 'Command complete' 307 /* 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
607 priv->recording_name); 607 priv->recording_name);
608 608
609 printk (KERN_DEBUG "vmlogrdr: recording command: %s\n", cp_command); 609 printk (KERN_DEBUG "vmlogrdr: recording command: %s\n", cp_command);
610 cpcmd(cp_command, cp_response, sizeof(cp_response)); 610 cpcmd(cp_command, cp_response, sizeof(cp_response), NULL);
611 printk (KERN_DEBUG "vmlogrdr: recording response: %s", 611 printk (KERN_DEBUG "vmlogrdr: recording response: %s",
612 cp_response); 612 cp_response);
613 613
@@ -682,7 +682,7 @@ vmlogrdr_recording_status_show(struct device_driver *driver, char *buf) {
682 char cp_command[] = "QUERY RECORDING "; 682 char cp_command[] = "QUERY RECORDING ";
683 int len; 683 int len;
684 684
685 cpcmd(cp_command, buf, 4096); 685 cpcmd(cp_command, buf, 4096, NULL);
686 len = strlen(buf); 686 len = strlen(buf);
687 return len; 687 return len;
688} 688}
diff --git a/drivers/s390/net/smsgiucv.c b/drivers/s390/net/smsgiucv.c
index 1e3f7f3c662f..d6469baa7e16 100644
--- a/drivers/s390/net/smsgiucv.c
+++ b/drivers/s390/net/smsgiucv.c
@@ -138,7 +138,7 @@ static void __exit
138smsg_exit(void) 138smsg_exit(void)
139{ 139{
140 if (smsg_handle > 0) { 140 if (smsg_handle > 0) {
141 cpcmd("SET SMSG OFF", 0, 0); 141 cpcmd("SET SMSG OFF", NULL, 0, NULL);
142 iucv_sever(smsg_pathid, 0); 142 iucv_sever(smsg_pathid, 0);
143 iucv_unregister_program(smsg_handle); 143 iucv_unregister_program(smsg_handle);
144 driver_unregister(&smsg_driver); 144 driver_unregister(&smsg_driver);
@@ -177,7 +177,7 @@ smsg_init(void)
177 smsg_handle = 0; 177 smsg_handle = 0;
178 return -EIO; 178 return -EIO;
179 } 179 }
180 cpcmd("SET SMSG IUCV", 0, 0); 180 cpcmd("SET SMSG IUCV", NULL, 0, NULL);
181 return 0; 181 return 0;
182} 182}
183 183
diff --git a/include/asm-s390/cpcmd.h b/include/asm-s390/cpcmd.h
index 1d33c5da083e..1fcf65be7a23 100644
--- a/include/asm-s390/cpcmd.h
+++ b/include/asm-s390/cpcmd.h
@@ -11,14 +11,28 @@
11#define __CPCMD__ 11#define __CPCMD__
12 12
13/* 13/*
14 * the lowlevel function for cpcmd
14 * the caller of __cpcmd has to ensure that the response buffer is below 2 GB 15 * the caller of __cpcmd has to ensure that the response buffer is below 2 GB
15 */ 16 */
16extern void __cpcmd(char *cmd, char *response, int rlen); 17extern int __cpcmd(const char *cmd, char *response, int rlen, int *response_code);
17 18
18#ifndef __s390x__ 19#ifndef __s390x__
19#define cpcmd __cpcmd 20#define cpcmd __cpcmd
20#else 21#else
21extern void cpcmd(char *cmd, char *response, int rlen); 22/*
23 * cpcmd is the in-kernel interface for issuing CP commands
24 *
25 * cmd: null-terminated command string, max 240 characters
26 * response: response buffer for VM's textual response
27 * rlen: size of the response buffer, cpcmd will not exceed this size
28 * but will cap the output, if its too large. Everything that
29 * did not fit into the buffer will be silently dropped
30 * response_code: return pointer for VM's error code
31 * return value: the size of the response. The caller can check if the buffer
32 * was large enough by comparing the return value and rlen
33 * NOTE: If the response buffer is not below 2 GB, cpcmd can sleep
34 */
35extern int cpcmd(const char *cmd, char *response, int rlen, int *response_code);
22#endif /*__s390x__*/ 36#endif /*__s390x__*/
23 37
24#endif 38#endif
generated by cgit v1.2.2 (git 2.25.0) at 2024-10-09 18:14:39 -0400