[WATCHDOG 14/57] ibmasr: coding style, locking verify
There is a new #if 0 section here which is a suggested fix for the horrible PCI hack in the existing code. Would be good if someone with a box that uses this device could test it. Signed-off-by: Alan Cox <alan@redhat.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
This commit is contained in:
parent
0829291ea4
commit
02355c329a
|
@ -19,9 +19,8 @@
|
|||
#include <linux/miscdevice.h>
|
||||
#include <linux/watchdog.h>
|
||||
#include <linux/dmi.h>
|
||||
|
||||
#include <asm/io.h>
|
||||
#include <asm/uaccess.h>
|
||||
#include <linux/io.h>
|
||||
#include <linux/uaccess.h>
|
||||
|
||||
|
||||
enum {
|
||||
|
@ -70,10 +69,13 @@ static char asr_expect_close;
|
|||
static unsigned int asr_type, asr_base, asr_length;
|
||||
static unsigned int asr_read_addr, asr_write_addr;
|
||||
static unsigned char asr_toggle_mask, asr_disable_mask;
|
||||
static spinlock_t asr_lock;
|
||||
|
||||
static void asr_toggle(void)
|
||||
static void __asr_toggle(void)
|
||||
{
|
||||
unsigned char reg = inb(asr_read_addr);
|
||||
unsigned char reg;
|
||||
|
||||
reg = inb(asr_read_addr);
|
||||
|
||||
outb(reg & ~asr_toggle_mask, asr_write_addr);
|
||||
reg = inb(asr_read_addr);
|
||||
|
@ -83,12 +85,21 @@ static void asr_toggle(void)
|
|||
|
||||
outb(reg & ~asr_toggle_mask, asr_write_addr);
|
||||
reg = inb(asr_read_addr);
|
||||
spin_unlock(&asr_lock);
|
||||
}
|
||||
|
||||
static void asr_toggle(void)
|
||||
{
|
||||
spin_lock(&asr_lock);
|
||||
__asr_toggle();
|
||||
spin_unlock(&asr_lock);
|
||||
}
|
||||
|
||||
static void asr_enable(void)
|
||||
{
|
||||
unsigned char reg;
|
||||
|
||||
spin_lock(&asr_lock);
|
||||
if (asr_type == ASMTYPE_TOPAZ) {
|
||||
/* asr_write_addr == asr_read_addr */
|
||||
reg = inb(asr_read_addr);
|
||||
|
@ -99,17 +110,21 @@ static void asr_enable(void)
|
|||
* First make sure the hardware timer is reset by toggling
|
||||
* ASR hardware timer line.
|
||||
*/
|
||||
asr_toggle();
|
||||
__asr_toggle();
|
||||
|
||||
reg = inb(asr_read_addr);
|
||||
outb(reg & ~asr_disable_mask, asr_write_addr);
|
||||
}
|
||||
reg = inb(asr_read_addr);
|
||||
spin_unlock(&asr_lock);
|
||||
}
|
||||
|
||||
static void asr_disable(void)
|
||||
{
|
||||
unsigned char reg = inb(asr_read_addr);
|
||||
unsigned char reg;
|
||||
|
||||
spin_lock(&asr_lock);
|
||||
reg = inb(asr_read_addr);
|
||||
|
||||
if (asr_type == ASMTYPE_TOPAZ)
|
||||
/* asr_write_addr == asr_read_addr */
|
||||
|
@ -122,6 +137,7 @@ static void asr_disable(void)
|
|||
outb(reg | asr_disable_mask, asr_write_addr);
|
||||
}
|
||||
reg = inb(asr_read_addr);
|
||||
spin_unlock(&asr_lock);
|
||||
}
|
||||
|
||||
static int __init asr_get_base_address(void)
|
||||
|
@ -133,7 +149,8 @@ static int __init asr_get_base_address(void)
|
|||
|
||||
switch (asr_type) {
|
||||
case ASMTYPE_TOPAZ:
|
||||
/* SELECT SuperIO CHIP FOR QUERYING (WRITE 0x07 TO BOTH 0x2E and 0x2F) */
|
||||
/* SELECT SuperIO CHIP FOR QUERYING
|
||||
(WRITE 0x07 TO BOTH 0x2E and 0x2F) */
|
||||
outb(0x07, 0x2e);
|
||||
outb(0x07, 0x2f);
|
||||
|
||||
|
@ -154,14 +171,26 @@ static int __init asr_get_base_address(void)
|
|||
|
||||
case ASMTYPE_JASPER:
|
||||
type = "Jaspers ";
|
||||
|
||||
/* FIXME: need to use pci_config_lock here, but it's not exported */
|
||||
#if 0
|
||||
u32 r;
|
||||
/* Suggested fix */
|
||||
pdev = pci_get_bus_and_slot(0, DEVFN(0x1f, 0));
|
||||
if (pdev == NULL)
|
||||
return -ENODEV;
|
||||
pci_read_config_dword(pdev, 0x58, &r);
|
||||
asr_base = r & 0xFFFE;
|
||||
pci_dev_put(pdev);
|
||||
#else
|
||||
/* FIXME: need to use pci_config_lock here,
|
||||
but it's not exported */
|
||||
|
||||
/* spin_lock_irqsave(&pci_config_lock, flags);*/
|
||||
|
||||
/* Select the SuperIO chip in the PCI I/O port register */
|
||||
outl(0x8000f858, 0xcf8);
|
||||
|
||||
/* BUS 0, Slot 1F, fnc 0, offset 58 */
|
||||
|
||||
/*
|
||||
* Read the base address for the SuperIO chip.
|
||||
* Only the lower 16 bits are valid, but the address is word
|
||||
|
@ -170,7 +199,7 @@ static int __init asr_get_base_address(void)
|
|||
asr_base = inl(0xcfc) & 0xfffe;
|
||||
|
||||
/* spin_unlock_irqrestore(&pci_config_lock, flags);*/
|
||||
|
||||
#endif
|
||||
asr_read_addr = asr_write_addr =
|
||||
asr_base + JASPER_ASR_REG_OFFSET;
|
||||
asr_toggle_mask = JASPER_ASR_TOGGLE_MASK;
|
||||
|
@ -241,11 +270,10 @@ static ssize_t asr_write(struct file *file, const char __user *buf,
|
|||
return count;
|
||||
}
|
||||
|
||||
static int asr_ioctl(struct inode *inode, struct file *file,
|
||||
unsigned int cmd, unsigned long arg)
|
||||
static long asr_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
|
||||
{
|
||||
static const struct watchdog_info ident = {
|
||||
.options = WDIOF_KEEPALIVEPING |
|
||||
.options = WDIOF_KEEPALIVEPING |
|
||||
WDIOF_MAGICCLOSE,
|
||||
.identity = "IBM ASR"
|
||||
};
|
||||
|
@ -254,53 +282,45 @@ static int asr_ioctl(struct inode *inode, struct file *file,
|
|||
int heartbeat;
|
||||
|
||||
switch (cmd) {
|
||||
case WDIOC_GETSUPPORT:
|
||||
return copy_to_user(argp, &ident, sizeof(ident)) ?
|
||||
-EFAULT : 0;
|
||||
|
||||
case WDIOC_GETSTATUS:
|
||||
case WDIOC_GETBOOTSTATUS:
|
||||
return put_user(0, p);
|
||||
|
||||
case WDIOC_KEEPALIVE:
|
||||
asr_toggle();
|
||||
return 0;
|
||||
|
||||
/*
|
||||
* The hardware has a fixed timeout value, so no WDIOC_SETTIMEOUT
|
||||
* and WDIOC_GETTIMEOUT always returns 256.
|
||||
*/
|
||||
case WDIOC_GETTIMEOUT:
|
||||
heartbeat = 256;
|
||||
return put_user(heartbeat, p);
|
||||
|
||||
case WDIOC_SETOPTIONS: {
|
||||
int new_options, retval = -EINVAL;
|
||||
|
||||
if (get_user(new_options, p))
|
||||
return -EFAULT;
|
||||
|
||||
if (new_options & WDIOS_DISABLECARD) {
|
||||
asr_disable();
|
||||
retval = 0;
|
||||
}
|
||||
|
||||
if (new_options & WDIOS_ENABLECARD) {
|
||||
asr_enable();
|
||||
asr_toggle();
|
||||
retval = 0;
|
||||
}
|
||||
|
||||
return retval;
|
||||
case WDIOC_GETSUPPORT:
|
||||
return copy_to_user(argp, &ident, sizeof(ident)) ? -EFAULT : 0;
|
||||
case WDIOC_GETSTATUS:
|
||||
case WDIOC_GETBOOTSTATUS:
|
||||
return put_user(0, p);
|
||||
case WDIOC_KEEPALIVE:
|
||||
asr_toggle();
|
||||
return 0;
|
||||
/*
|
||||
* The hardware has a fixed timeout value, so no WDIOC_SETTIMEOUT
|
||||
* and WDIOC_GETTIMEOUT always returns 256.
|
||||
*/
|
||||
case WDIOC_GETTIMEOUT:
|
||||
heartbeat = 256;
|
||||
return put_user(heartbeat, p);
|
||||
case WDIOC_SETOPTIONS:
|
||||
{
|
||||
int new_options, retval = -EINVAL;
|
||||
if (get_user(new_options, p))
|
||||
return -EFAULT;
|
||||
if (new_options & WDIOS_DISABLECARD) {
|
||||
asr_disable();
|
||||
retval = 0;
|
||||
}
|
||||
if (new_options & WDIOS_ENABLECARD) {
|
||||
asr_enable();
|
||||
asr_toggle();
|
||||
retval = 0;
|
||||
}
|
||||
return retval;
|
||||
}
|
||||
default:
|
||||
return -ENOTTY;
|
||||
}
|
||||
|
||||
return -ENOTTY;
|
||||
}
|
||||
|
||||
static int asr_open(struct inode *inode, struct file *file)
|
||||
{
|
||||
if(test_and_set_bit(0, &asr_is_open))
|
||||
if (test_and_set_bit(0, &asr_is_open))
|
||||
return -EBUSY;
|
||||
|
||||
asr_toggle();
|
||||
|
@ -314,7 +334,8 @@ static int asr_release(struct inode *inode, struct file *file)
|
|||
if (asr_expect_close == 42)
|
||||
asr_disable();
|
||||
else {
|
||||
printk(KERN_CRIT PFX "unexpected close, not stopping watchdog!\n");
|
||||
printk(KERN_CRIT PFX
|
||||
"unexpected close, not stopping watchdog!\n");
|
||||
asr_toggle();
|
||||
}
|
||||
clear_bit(0, &asr_is_open);
|
||||
|
@ -323,12 +344,12 @@ static int asr_release(struct inode *inode, struct file *file)
|
|||
}
|
||||
|
||||
static const struct file_operations asr_fops = {
|
||||
.owner = THIS_MODULE,
|
||||
.llseek = no_llseek,
|
||||
.write = asr_write,
|
||||
.ioctl = asr_ioctl,
|
||||
.open = asr_open,
|
||||
.release = asr_release,
|
||||
.owner = THIS_MODULE,
|
||||
.llseek = no_llseek,
|
||||
.write = asr_write,
|
||||
.unlocked_ioctl = asr_ioctl,
|
||||
.open = asr_open,
|
||||
.release = asr_release,
|
||||
};
|
||||
|
||||
static struct miscdevice asr_miscdev = {
|
||||
|
@ -367,6 +388,8 @@ static int __init ibmasr_init(void)
|
|||
if (!asr_type)
|
||||
return -ENODEV;
|
||||
|
||||
spin_lock_init(&asr_lock);
|
||||
|
||||
rc = asr_get_base_address();
|
||||
if (rc)
|
||||
return rc;
|
||||
|
@ -395,7 +418,9 @@ module_init(ibmasr_init);
|
|||
module_exit(ibmasr_exit);
|
||||
|
||||
module_param(nowayout, int, 0);
|
||||
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default=" __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
|
||||
MODULE_PARM_DESC(nowayout,
|
||||
"Watchdog cannot be stopped once started (default="
|
||||
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
|
||||
|
||||
MODULE_DESCRIPTION("IBM Automatic Server Restart driver");
|
||||
MODULE_AUTHOR("Andrey Panin");
|
||||
|
|
Loading…
Reference in a new issue