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s390/sclp: Add SCLP character device driver

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Add a character misc device "sclp_ctl" that allows to run SCCBs
from user space using the SCLP_CTL_SCCB ioctl.

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Michael Holzheu 2013-06-06 09:52:08 +02:00 committed by Martin Schwidefsky
parent e9a8f32a98
commit d475f942b1
8 changed files with 192 additions and 15 deletions
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1
Documentation/ioctl/ioctl-number.txt
View File

@ -72,6 +72,7 @@ Code Seq#(hex) Include File Comments
0x06 all linux/lp.h
0x09 all linux/raid/md_u.h
0x10 00-0F drivers/char/s390/vmcp.h
0x10 10-1F arch/s390/include/uapi/sclp_ctl.h
0x12 all linux/fs.h
linux/blkpg.h
0x1b all InfiniBand Subsystem <http://infiniband.sourceforge.net/>

1
arch/s390/include/uapi/asm/Kbuild
View File

@ -35,6 +35,7 @@ header-y += siginfo.h
header-y += signal.h
header-y += socket.h
header-y += sockios.h
header-y += sclp_ctl.h
header-y += stat.h
header-y += statfs.h
header-y += swab.h

24
arch/s390/include/uapi/asm/sclp_ctl.h Normal file
View File

@ -0,0 +1,24 @@
/*
* IOCTL interface for SCLP
*
* Copyright IBM Corp. 2012
*
* Author: Michael Holzheu <holzheu@linux.vnet.ibm.com>
*/
#ifndef _ASM_SCLP_CTL_H
#define _ASM_SCLP_CTL_H
#include <linux/types.h>
struct sclp_ctl_sccb {
__u32 cmdw;
__u64 sccb;
} __attribute__((packed));
#define SCLP_CTL_IOCTL_MAGIC 0x10
#define SCLP_CTL_SCCB \
_IOWR(SCLP_CTL_IOCTL_MAGIC, 0x10, struct sclp_ctl_sccb)
#endif

2
drivers/s390/char/Makefile
View File

@ -3,7 +3,7 @@
#
obj-y += ctrlchar.o keyboard.o defkeymap.o sclp.o sclp_rw.o sclp_quiesce.o \
sclp_cmd.o sclp_config.o sclp_cpi_sys.o sclp_ocf.o
sclp_cmd.o sclp_config.o sclp_cpi_sys.o sclp_ocf.o sclp_ctl.o
obj-$(CONFIG_TN3270) += raw3270.o
obj-$(CONFIG_TN3270_CONSOLE) += con3270.o

15
drivers/s390/char/sclp.c
View File

@ -148,14 +148,19 @@ static int sclp_init(void);
int
sclp_service_call(sclp_cmdw_t command, void *sccb)
{
int cc;
int cc = 4; /* Initialize for program check handling */
asm volatile(
" .insn rre,0xb2200000,%1,%2\n" /* servc %1,%2 */
" ipm %0\n"
" srl %0,28"
: "=&d" (cc) : "d" (command), "a" (__pa(sccb))
"0: .insn rre,0xb2200000,%1,%2\n" /* servc %1,%2 */
"1: ipm %0\n"
" srl %0,28\n"
"2:\n"
EX_TABLE(0b, 2b)
EX_TABLE(1b, 2b)
: "+&d" (cc) : "d" (command), "a" (__pa(sccb))
: "cc", "memory");
if (cc == 4)
return -EINVAL;
if (cc == 3)
return -EIO;
if (cc == 2)

1
drivers/s390/char/sclp.h
View File

@ -171,6 +171,7 @@ int sclp_remove_processed(struct sccb_header *sccb);
int sclp_deactivate(void);
int sclp_reactivate(void);
int sclp_service_call(sclp_cmdw_t command, void *sccb);
int sclp_sync_request(sclp_cmdw_t command, void *sccb);
int sclp_sdias_init(void);
void sclp_sdias_exit(void);

18
drivers/s390/char/sclp_cmd.c
View File

@ -195,7 +195,7 @@ static void sclp_sync_callback(struct sclp_req *req, void *data)
complete(completion);
}
static int do_sync_request(sclp_cmdw_t cmd, void *sccb)
int sclp_sync_request(sclp_cmdw_t cmd, void *sccb)
{
struct completion completion;
struct sclp_req *request;
@ -270,7 +270,7 @@ int sclp_get_cpu_info(struct sclp_cpu_info *info)
if (!sccb)
return -ENOMEM;
sccb->header.length = sizeof(*sccb);
rc = do_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb);
rc = sclp_sync_request(SCLP_CMDW_READ_CPU_INFO, sccb);
if (rc)
goto out;
if (sccb->header.response_code != 0x0010) {
@ -304,7 +304,7 @@ static int do_cpu_configure(sclp_cmdw_t cmd)
if (!sccb)
return -ENOMEM;
sccb->header.length = sizeof(*sccb);
rc = do_sync_request(cmd, sccb);
rc = sclp_sync_request(cmd, sccb);
if (rc)
goto out;
switch (sccb->header.response_code) {
@ -374,7 +374,7 @@ static int do_assign_storage(sclp_cmdw_t cmd, u16 rn)
return -ENOMEM;
sccb->header.length = PAGE_SIZE;
sccb->rn = rn;
rc = do_sync_request(cmd, sccb);
rc = sclp_sync_request(cmd, sccb);
if (rc)
goto out;
switch (sccb->header.response_code) {
@ -429,7 +429,7 @@ static int sclp_attach_storage(u8 id)
if (!sccb)
return -ENOMEM;
sccb->header.length = PAGE_SIZE;
rc = do_sync_request(0x00080001 | id << 8, sccb);
rc = sclp_sync_request(0x00080001 | id << 8, sccb);
if (rc)
goto out;
switch (sccb->header.response_code) {
@ -627,7 +627,7 @@ static int __init sclp_detect_standby_memory(void)
for (id = 0; id <= sclp_max_storage_id; id++) {
memset(sccb, 0, PAGE_SIZE);
sccb->header.length = PAGE_SIZE;
rc = do_sync_request(0x00040001 | id << 8, sccb);
rc = sclp_sync_request(0x00040001 | id << 8, sccb);
if (rc)
goto out;
switch (sccb->header.response_code) {
@ -714,7 +714,7 @@ static int do_pci_configure(sclp_cmdw_t cmd, u32 fid)
sccb->header.length = PAGE_SIZE;
sccb->atype = SCLP_RECONFIG_PCI_ATPYE;
sccb->aid = fid;
rc = do_sync_request(cmd, sccb);
rc = sclp_sync_request(cmd, sccb);
if (rc)
goto out;
switch (sccb->header.response_code) {
@ -771,7 +771,7 @@ static int do_chp_configure(sclp_cmdw_t cmd)
if (!sccb)
return -ENOMEM;
sccb->header.length = sizeof(*sccb);
rc = do_sync_request(cmd, sccb);
rc = sclp_sync_request(cmd, sccb);
if (rc)
goto out;
switch (sccb->header.response_code) {
@ -846,7 +846,7 @@ int sclp_chp_read_info(struct sclp_chp_info *info)
if (!sccb)
return -ENOMEM;
sccb->header.length = sizeof(*sccb);
rc = do_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
rc = sclp_sync_request(SCLP_CMDW_READ_CHPATH_INFORMATION, sccb);
if (rc)
goto out;
if (sccb->header.response_code != 0x0010) {

145
drivers/s390/char/sclp_ctl.c Normal file
View File

@ -0,0 +1,145 @@
/*
* IOCTL interface for SCLP
*
* Copyright IBM Corp. 2012
*
* Author: Michael Holzheu <holzheu@linux.vnet.ibm.com>
*/
#include <linux/compat.h>
#include <linux/uaccess.h>
#include <linux/miscdevice.h>
#include <linux/gfp.h>
#include <linux/module.h>
#include <linux/ioctl.h>
#include <linux/fs.h>
#include <linux/compat.h>
#include <asm/compat.h>
#include <asm/sclp_ctl.h>
#include <asm/sclp.h>
#include "sclp.h"
/*
* Supported command words
*/
static unsigned int sclp_ctl_sccb_wlist[] = {
0x00400002,
0x00410002,
};
/*
* Check if command word is supported
*/
static int sclp_ctl_cmdw_supported(unsigned int cmdw)
{
int i;
for (i = 0; i < ARRAY_SIZE(sclp_ctl_sccb_wlist); i++) {
if (cmdw == sclp_ctl_sccb_wlist[i])
return 1;
}
return 0;
}
static void __user *u64_to_uptr(u64 value)
{
if (is_compat_task())
return compat_ptr(value);
else
return (void __user *)(unsigned long)value;
}
/*
* Start SCLP request
*/
static int sclp_ctl_ioctl_sccb(void __user *user_area)
{
struct sclp_ctl_sccb ctl_sccb;
struct sccb_header *sccb;
int rc;
if (copy_from_user(&ctl_sccb, user_area, sizeof(ctl_sccb)))
return -EFAULT;
if (!sclp_ctl_cmdw_supported(ctl_sccb.cmdw))
return -EOPNOTSUPP;
sccb = (void *) get_zeroed_page(GFP_KERNEL | GFP_DMA);
if (!sccb)
return -ENOMEM;
if (copy_from_user(sccb, u64_to_uptr(ctl_sccb.sccb), sizeof(*sccb))) {
rc = -EFAULT;
goto out_free;
}
if (sccb->length > PAGE_SIZE || sccb->length < 8)
return -EINVAL;
if (copy_from_user(sccb, u64_to_uptr(ctl_sccb.sccb), sccb->length)) {
rc = -EFAULT;
goto out_free;
}
rc = sclp_sync_request(ctl_sccb.cmdw, sccb);
if (rc)
goto out_free;
if (copy_to_user(u64_to_uptr(ctl_sccb.sccb), sccb, sccb->length))
rc = -EFAULT;
out_free:
free_page((unsigned long) sccb);
return rc;
}
/*
* SCLP SCCB ioctl function
*/
static long sclp_ctl_ioctl(struct file *filp, unsigned int cmd,
unsigned long arg)
{
void __user *argp;
if (is_compat_task())
argp = compat_ptr(arg);
else
argp = (void __user *) arg;
switch (cmd) {
case SCLP_CTL_SCCB:
return sclp_ctl_ioctl_sccb(argp);
default: /* unknown ioctl number */
return -ENOTTY;
}
}
/*
* File operations
*/
static const struct file_operations sclp_ctl_fops = {
.owner = THIS_MODULE,
.open = nonseekable_open,
.unlocked_ioctl = sclp_ctl_ioctl,
.compat_ioctl = sclp_ctl_ioctl,
.llseek = no_llseek,
};
/*
* Misc device definition
*/
static struct miscdevice sclp_ctl_device = {
.minor = MISC_DYNAMIC_MINOR,
.name = "sclp",
.fops = &sclp_ctl_fops,
};
/*
* Register sclp_ctl misc device
*/
static int __init sclp_ctl_init(void)
{
return misc_register(&sclp_ctl_device);
}
module_init(sclp_ctl_init);
/*
* Deregister sclp_ctl misc device
*/
static void __exit sclp_ctl_exit(void)
{
misc_deregister(&sclp_ctl_device);
}
module_exit(sclp_ctl_exit);