mirror of
https://github.com/FEX-Emu/linux.git
synced 2024-12-21 00:42:16 +00:00
6f681c2eab
The hpwdt timer is a 16 bit value with 128ms resolution. Let applications use this entire range. Signed-off-by: dann frazier <dannf@hp.com> Acked-by: Thomas Mingarelli <Thomas.Mingarelli@hp.com> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
810 lines
19 KiB
C
810 lines
19 KiB
C
/*
|
|
* HP WatchDog Driver
|
|
* based on
|
|
*
|
|
* SoftDog 0.05: A Software Watchdog Device
|
|
*
|
|
* (c) Copyright 2007 Hewlett-Packard Development Company, L.P.
|
|
* Thomas Mingarelli <thomas.mingarelli@hp.com>
|
|
*
|
|
* This program is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU General Public License
|
|
* version 2 as published by the Free Software Foundation
|
|
*
|
|
*/
|
|
|
|
#include <linux/device.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/init.h>
|
|
#include <linux/io.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/kernel.h>
|
|
#include <linux/miscdevice.h>
|
|
#include <linux/module.h>
|
|
#include <linux/moduleparam.h>
|
|
#include <linux/pci.h>
|
|
#include <linux/pci_ids.h>
|
|
#include <linux/types.h>
|
|
#include <linux/uaccess.h>
|
|
#include <linux/watchdog.h>
|
|
#include <linux/dmi.h>
|
|
#include <linux/spinlock.h>
|
|
#include <linux/nmi.h>
|
|
#include <linux/kdebug.h>
|
|
#include <linux/notifier.h>
|
|
#include <asm/cacheflush.h>
|
|
|
|
#define HPWDT_VERSION "1.1.1"
|
|
#define SECS_TO_TICKS(secs) ((secs) * 1000 / 128)
|
|
#define TICKS_TO_SECS(ticks) ((ticks) * 128 / 1000)
|
|
#define HPWDT_MAX_TIMER TICKS_TO_SECS(65535)
|
|
#define DEFAULT_MARGIN 30
|
|
|
|
static unsigned int soft_margin = DEFAULT_MARGIN; /* in seconds */
|
|
static unsigned int reload; /* the computed soft_margin */
|
|
static int nowayout = WATCHDOG_NOWAYOUT;
|
|
static char expect_release;
|
|
static unsigned long hpwdt_is_open;
|
|
|
|
static void __iomem *pci_mem_addr; /* the PCI-memory address */
|
|
static unsigned long __iomem *hpwdt_timer_reg;
|
|
static unsigned long __iomem *hpwdt_timer_con;
|
|
|
|
static struct pci_device_id hpwdt_devices[] = {
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) }, /* iLO2 */
|
|
{ PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) }, /* iLO3 */
|
|
{0}, /* terminate list */
|
|
};
|
|
MODULE_DEVICE_TABLE(pci, hpwdt_devices);
|
|
|
|
#define PCI_BIOS32_SD_VALUE 0x5F32335F /* "_32_" */
|
|
#define CRU_BIOS_SIGNATURE_VALUE 0x55524324
|
|
#define PCI_BIOS32_PARAGRAPH_LEN 16
|
|
#define PCI_ROM_BASE1 0x000F0000
|
|
#define ROM_SIZE 0x10000
|
|
|
|
struct bios32_service_dir {
|
|
u32 signature;
|
|
u32 entry_point;
|
|
u8 revision;
|
|
u8 length;
|
|
u8 checksum;
|
|
u8 reserved[5];
|
|
};
|
|
|
|
/* type 212 */
|
|
struct smbios_cru64_info {
|
|
u8 type;
|
|
u8 byte_length;
|
|
u16 handle;
|
|
u32 signature;
|
|
u64 physical_address;
|
|
u32 double_length;
|
|
u32 double_offset;
|
|
};
|
|
#define SMBIOS_CRU64_INFORMATION 212
|
|
|
|
struct cmn_registers {
|
|
union {
|
|
struct {
|
|
u8 ral;
|
|
u8 rah;
|
|
u16 rea2;
|
|
};
|
|
u32 reax;
|
|
} u1;
|
|
union {
|
|
struct {
|
|
u8 rbl;
|
|
u8 rbh;
|
|
u8 reb2l;
|
|
u8 reb2h;
|
|
};
|
|
u32 rebx;
|
|
} u2;
|
|
union {
|
|
struct {
|
|
u8 rcl;
|
|
u8 rch;
|
|
u16 rec2;
|
|
};
|
|
u32 recx;
|
|
} u3;
|
|
union {
|
|
struct {
|
|
u8 rdl;
|
|
u8 rdh;
|
|
u16 red2;
|
|
};
|
|
u32 redx;
|
|
} u4;
|
|
|
|
u32 resi;
|
|
u32 redi;
|
|
u16 rds;
|
|
u16 res;
|
|
u32 reflags;
|
|
} __attribute__((packed));
|
|
|
|
static unsigned int hpwdt_nmi_sourcing;
|
|
static unsigned int allow_kdump;
|
|
static unsigned int priority; /* hpwdt at end of die_notify list */
|
|
static DEFINE_SPINLOCK(rom_lock);
|
|
static void *cru_rom_addr;
|
|
static struct cmn_registers cmn_regs;
|
|
|
|
extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs,
|
|
unsigned long *pRomEntry);
|
|
|
|
#ifdef CONFIG_X86_32
|
|
/* --32 Bit Bios------------------------------------------------------------ */
|
|
|
|
#define HPWDT_ARCH 32
|
|
|
|
asm(".text \n\t"
|
|
".align 4 \n"
|
|
"asminline_call: \n\t"
|
|
"pushl %ebp \n\t"
|
|
"movl %esp, %ebp \n\t"
|
|
"pusha \n\t"
|
|
"pushf \n\t"
|
|
"push %es \n\t"
|
|
"push %ds \n\t"
|
|
"pop %es \n\t"
|
|
"movl 8(%ebp),%eax \n\t"
|
|
"movl 4(%eax),%ebx \n\t"
|
|
"movl 8(%eax),%ecx \n\t"
|
|
"movl 12(%eax),%edx \n\t"
|
|
"movl 16(%eax),%esi \n\t"
|
|
"movl 20(%eax),%edi \n\t"
|
|
"movl (%eax),%eax \n\t"
|
|
"push %cs \n\t"
|
|
"call *12(%ebp) \n\t"
|
|
"pushf \n\t"
|
|
"pushl %eax \n\t"
|
|
"movl 8(%ebp),%eax \n\t"
|
|
"movl %ebx,4(%eax) \n\t"
|
|
"movl %ecx,8(%eax) \n\t"
|
|
"movl %edx,12(%eax) \n\t"
|
|
"movl %esi,16(%eax) \n\t"
|
|
"movl %edi,20(%eax) \n\t"
|
|
"movw %ds,24(%eax) \n\t"
|
|
"movw %es,26(%eax) \n\t"
|
|
"popl %ebx \n\t"
|
|
"movl %ebx,(%eax) \n\t"
|
|
"popl %ebx \n\t"
|
|
"movl %ebx,28(%eax) \n\t"
|
|
"pop %es \n\t"
|
|
"popf \n\t"
|
|
"popa \n\t"
|
|
"leave \n\t"
|
|
"ret \n\t"
|
|
".previous");
|
|
|
|
|
|
/*
|
|
* cru_detect
|
|
*
|
|
* Routine Description:
|
|
* This function uses the 32-bit BIOS Service Directory record to
|
|
* search for a $CRU record.
|
|
*
|
|
* Return Value:
|
|
* 0 : SUCCESS
|
|
* <0 : FAILURE
|
|
*/
|
|
static int __devinit cru_detect(unsigned long map_entry,
|
|
unsigned long map_offset)
|
|
{
|
|
void *bios32_map;
|
|
unsigned long *bios32_entrypoint;
|
|
unsigned long cru_physical_address;
|
|
unsigned long cru_length;
|
|
unsigned long physical_bios_base = 0;
|
|
unsigned long physical_bios_offset = 0;
|
|
int retval = -ENODEV;
|
|
|
|
bios32_map = ioremap(map_entry, (2 * PAGE_SIZE));
|
|
|
|
if (bios32_map == NULL)
|
|
return -ENODEV;
|
|
|
|
bios32_entrypoint = bios32_map + map_offset;
|
|
|
|
cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE;
|
|
|
|
asminline_call(&cmn_regs, bios32_entrypoint);
|
|
|
|
if (cmn_regs.u1.ral != 0) {
|
|
printk(KERN_WARNING
|
|
"hpwdt: Call succeeded but with an error: 0x%x\n",
|
|
cmn_regs.u1.ral);
|
|
} else {
|
|
physical_bios_base = cmn_regs.u2.rebx;
|
|
physical_bios_offset = cmn_regs.u4.redx;
|
|
cru_length = cmn_regs.u3.recx;
|
|
cru_physical_address =
|
|
physical_bios_base + physical_bios_offset;
|
|
|
|
/* If the values look OK, then map it in. */
|
|
if ((physical_bios_base + physical_bios_offset)) {
|
|
cru_rom_addr =
|
|
ioremap(cru_physical_address, cru_length);
|
|
if (cru_rom_addr)
|
|
retval = 0;
|
|
}
|
|
|
|
printk(KERN_DEBUG "hpwdt: CRU Base Address: 0x%lx\n",
|
|
physical_bios_base);
|
|
printk(KERN_DEBUG "hpwdt: CRU Offset Address: 0x%lx\n",
|
|
physical_bios_offset);
|
|
printk(KERN_DEBUG "hpwdt: CRU Length: 0x%lx\n",
|
|
cru_length);
|
|
printk(KERN_DEBUG "hpwdt: CRU Mapped Address: %p\n",
|
|
&cru_rom_addr);
|
|
}
|
|
iounmap(bios32_map);
|
|
return retval;
|
|
}
|
|
|
|
/*
|
|
* bios_checksum
|
|
*/
|
|
static int __devinit bios_checksum(const char __iomem *ptr, int len)
|
|
{
|
|
char sum = 0;
|
|
int i;
|
|
|
|
/*
|
|
* calculate checksum of size bytes. This should add up
|
|
* to zero if we have a valid header.
|
|
*/
|
|
for (i = 0; i < len; i++)
|
|
sum += ptr[i];
|
|
|
|
return ((sum == 0) && (len > 0));
|
|
}
|
|
|
|
/*
|
|
* bios32_present
|
|
*
|
|
* Routine Description:
|
|
* This function finds the 32-bit BIOS Service Directory
|
|
*
|
|
* Return Value:
|
|
* 0 : SUCCESS
|
|
* <0 : FAILURE
|
|
*/
|
|
static int __devinit bios32_present(const char __iomem *p)
|
|
{
|
|
struct bios32_service_dir *bios_32_ptr;
|
|
int length;
|
|
unsigned long map_entry, map_offset;
|
|
|
|
bios_32_ptr = (struct bios32_service_dir *) p;
|
|
|
|
/*
|
|
* Search for signature by checking equal to the swizzled value
|
|
* instead of calling another routine to perform a strcmp.
|
|
*/
|
|
if (bios_32_ptr->signature == PCI_BIOS32_SD_VALUE) {
|
|
length = bios_32_ptr->length * PCI_BIOS32_PARAGRAPH_LEN;
|
|
if (bios_checksum(p, length)) {
|
|
/*
|
|
* According to the spec, we're looking for the
|
|
* first 4KB-aligned address below the entrypoint
|
|
* listed in the header. The Service Directory code
|
|
* is guaranteed to occupy no more than 2 4KB pages.
|
|
*/
|
|
map_entry = bios_32_ptr->entry_point & ~(PAGE_SIZE - 1);
|
|
map_offset = bios_32_ptr->entry_point - map_entry;
|
|
|
|
return cru_detect(map_entry, map_offset);
|
|
}
|
|
}
|
|
return -ENODEV;
|
|
}
|
|
|
|
static int __devinit detect_cru_service(void)
|
|
{
|
|
char __iomem *p, *q;
|
|
int rc = -1;
|
|
|
|
/*
|
|
* Search from 0x0f0000 through 0x0fffff, inclusive.
|
|
*/
|
|
p = ioremap(PCI_ROM_BASE1, ROM_SIZE);
|
|
if (p == NULL)
|
|
return -ENOMEM;
|
|
|
|
for (q = p; q < p + ROM_SIZE; q += 16) {
|
|
rc = bios32_present(q);
|
|
if (!rc)
|
|
break;
|
|
}
|
|
iounmap(p);
|
|
return rc;
|
|
}
|
|
/* ------------------------------------------------------------------------- */
|
|
#endif /* CONFIG_X86_32 */
|
|
#ifdef CONFIG_X86_64
|
|
/* --64 Bit Bios------------------------------------------------------------ */
|
|
|
|
#define HPWDT_ARCH 64
|
|
|
|
asm(".text \n\t"
|
|
".align 4 \n"
|
|
"asminline_call: \n\t"
|
|
"pushq %rbp \n\t"
|
|
"movq %rsp, %rbp \n\t"
|
|
"pushq %rax \n\t"
|
|
"pushq %rbx \n\t"
|
|
"pushq %rdx \n\t"
|
|
"pushq %r12 \n\t"
|
|
"pushq %r9 \n\t"
|
|
"movq %rsi, %r12 \n\t"
|
|
"movq %rdi, %r9 \n\t"
|
|
"movl 4(%r9),%ebx \n\t"
|
|
"movl 8(%r9),%ecx \n\t"
|
|
"movl 12(%r9),%edx \n\t"
|
|
"movl 16(%r9),%esi \n\t"
|
|
"movl 20(%r9),%edi \n\t"
|
|
"movl (%r9),%eax \n\t"
|
|
"call *%r12 \n\t"
|
|
"pushfq \n\t"
|
|
"popq %r12 \n\t"
|
|
"movl %eax, (%r9) \n\t"
|
|
"movl %ebx, 4(%r9) \n\t"
|
|
"movl %ecx, 8(%r9) \n\t"
|
|
"movl %edx, 12(%r9) \n\t"
|
|
"movl %esi, 16(%r9) \n\t"
|
|
"movl %edi, 20(%r9) \n\t"
|
|
"movq %r12, %rax \n\t"
|
|
"movl %eax, 28(%r9) \n\t"
|
|
"popq %r9 \n\t"
|
|
"popq %r12 \n\t"
|
|
"popq %rdx \n\t"
|
|
"popq %rbx \n\t"
|
|
"popq %rax \n\t"
|
|
"leave \n\t"
|
|
"ret \n\t"
|
|
".previous");
|
|
|
|
/*
|
|
* dmi_find_cru
|
|
*
|
|
* Routine Description:
|
|
* This function checks whether or not a SMBIOS/DMI record is
|
|
* the 64bit CRU info or not
|
|
*/
|
|
static void __devinit dmi_find_cru(const struct dmi_header *dm, void *dummy)
|
|
{
|
|
struct smbios_cru64_info *smbios_cru64_ptr;
|
|
unsigned long cru_physical_address;
|
|
|
|
if (dm->type == SMBIOS_CRU64_INFORMATION) {
|
|
smbios_cru64_ptr = (struct smbios_cru64_info *) dm;
|
|
if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) {
|
|
cru_physical_address =
|
|
smbios_cru64_ptr->physical_address +
|
|
smbios_cru64_ptr->double_offset;
|
|
cru_rom_addr = ioremap(cru_physical_address,
|
|
smbios_cru64_ptr->double_length);
|
|
set_memory_x((unsigned long)cru_rom_addr & PAGE_MASK,
|
|
smbios_cru64_ptr->double_length >> PAGE_SHIFT);
|
|
}
|
|
}
|
|
}
|
|
|
|
static int __devinit detect_cru_service(void)
|
|
{
|
|
cru_rom_addr = NULL;
|
|
|
|
dmi_walk(dmi_find_cru, NULL);
|
|
|
|
/* if cru_rom_addr has been set then we found a CRU service */
|
|
return ((cru_rom_addr != NULL) ? 0 : -ENODEV);
|
|
}
|
|
/* ------------------------------------------------------------------------- */
|
|
#endif /* CONFIG_X86_64 */
|
|
|
|
/*
|
|
* Watchdog operations
|
|
*/
|
|
static void hpwdt_start(void)
|
|
{
|
|
reload = SECS_TO_TICKS(soft_margin);
|
|
iowrite16(reload, hpwdt_timer_reg);
|
|
iowrite16(0x85, hpwdt_timer_con);
|
|
}
|
|
|
|
static void hpwdt_stop(void)
|
|
{
|
|
unsigned long data;
|
|
|
|
data = ioread16(hpwdt_timer_con);
|
|
data &= 0xFE;
|
|
iowrite16(data, hpwdt_timer_con);
|
|
}
|
|
|
|
static void hpwdt_ping(void)
|
|
{
|
|
iowrite16(reload, hpwdt_timer_reg);
|
|
}
|
|
|
|
static int hpwdt_change_timer(int new_margin)
|
|
{
|
|
if (new_margin < 1 || new_margin > HPWDT_MAX_TIMER) {
|
|
printk(KERN_WARNING
|
|
"hpwdt: New value passed in is invalid: %d seconds.\n",
|
|
new_margin);
|
|
return -EINVAL;
|
|
}
|
|
|
|
soft_margin = new_margin;
|
|
printk(KERN_DEBUG
|
|
"hpwdt: New timer passed in is %d seconds.\n",
|
|
new_margin);
|
|
reload = SECS_TO_TICKS(soft_margin);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* NMI Handler
|
|
*/
|
|
static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason,
|
|
void *data)
|
|
{
|
|
unsigned long rom_pl;
|
|
static int die_nmi_called;
|
|
|
|
if (ulReason != DIE_NMI && ulReason != DIE_NMI_IPI)
|
|
return NOTIFY_OK;
|
|
|
|
if (hpwdt_nmi_sourcing) {
|
|
spin_lock_irqsave(&rom_lock, rom_pl);
|
|
if (!die_nmi_called)
|
|
asminline_call(&cmn_regs, cru_rom_addr);
|
|
die_nmi_called = 1;
|
|
spin_unlock_irqrestore(&rom_lock, rom_pl);
|
|
if (cmn_regs.u1.ral == 0) {
|
|
printk(KERN_WARNING "hpwdt: An NMI occurred, "
|
|
"but unable to determine source.\n");
|
|
} else {
|
|
if (allow_kdump)
|
|
hpwdt_stop();
|
|
panic("An NMI occurred, please see the Integrated "
|
|
"Management Log for details.\n");
|
|
}
|
|
}
|
|
return NOTIFY_OK;
|
|
}
|
|
|
|
/*
|
|
* /dev/watchdog handling
|
|
*/
|
|
static int hpwdt_open(struct inode *inode, struct file *file)
|
|
{
|
|
/* /dev/watchdog can only be opened once */
|
|
if (test_and_set_bit(0, &hpwdt_is_open))
|
|
return -EBUSY;
|
|
|
|
/* Start the watchdog */
|
|
hpwdt_start();
|
|
hpwdt_ping();
|
|
|
|
return nonseekable_open(inode, file);
|
|
}
|
|
|
|
static int hpwdt_release(struct inode *inode, struct file *file)
|
|
{
|
|
/* Stop the watchdog */
|
|
if (expect_release == 42) {
|
|
hpwdt_stop();
|
|
} else {
|
|
printk(KERN_CRIT
|
|
"hpwdt: Unexpected close, not stopping watchdog!\n");
|
|
hpwdt_ping();
|
|
}
|
|
|
|
expect_release = 0;
|
|
|
|
/* /dev/watchdog is being closed, make sure it can be re-opened */
|
|
clear_bit(0, &hpwdt_is_open);
|
|
|
|
return 0;
|
|
}
|
|
|
|
static ssize_t hpwdt_write(struct file *file, const char __user *data,
|
|
size_t len, loff_t *ppos)
|
|
{
|
|
/* See if we got the magic character 'V' and reload the timer */
|
|
if (len) {
|
|
if (!nowayout) {
|
|
size_t i;
|
|
|
|
/* note: just in case someone wrote the magic character
|
|
* five months ago... */
|
|
expect_release = 0;
|
|
|
|
/* scan to see whether or not we got the magic char. */
|
|
for (i = 0; i != len; i++) {
|
|
char c;
|
|
if (get_user(c, data + i))
|
|
return -EFAULT;
|
|
if (c == 'V')
|
|
expect_release = 42;
|
|
}
|
|
}
|
|
|
|
/* someone wrote to us, we should reload the timer */
|
|
hpwdt_ping();
|
|
}
|
|
|
|
return len;
|
|
}
|
|
|
|
static const struct watchdog_info ident = {
|
|
.options = WDIOF_SETTIMEOUT |
|
|
WDIOF_KEEPALIVEPING |
|
|
WDIOF_MAGICCLOSE,
|
|
.identity = "HP iLO2+ HW Watchdog Timer",
|
|
};
|
|
|
|
static long hpwdt_ioctl(struct file *file, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
void __user *argp = (void __user *)arg;
|
|
int __user *p = argp;
|
|
int new_margin;
|
|
int ret = -ENOTTY;
|
|
|
|
switch (cmd) {
|
|
case WDIOC_GETSUPPORT:
|
|
ret = 0;
|
|
if (copy_to_user(argp, &ident, sizeof(ident)))
|
|
ret = -EFAULT;
|
|
break;
|
|
|
|
case WDIOC_GETSTATUS:
|
|
case WDIOC_GETBOOTSTATUS:
|
|
ret = put_user(0, p);
|
|
break;
|
|
|
|
case WDIOC_KEEPALIVE:
|
|
hpwdt_ping();
|
|
ret = 0;
|
|
break;
|
|
|
|
case WDIOC_SETTIMEOUT:
|
|
ret = get_user(new_margin, p);
|
|
if (ret)
|
|
break;
|
|
|
|
ret = hpwdt_change_timer(new_margin);
|
|
if (ret)
|
|
break;
|
|
|
|
hpwdt_ping();
|
|
/* Fall */
|
|
case WDIOC_GETTIMEOUT:
|
|
ret = put_user(soft_margin, p);
|
|
break;
|
|
}
|
|
return ret;
|
|
}
|
|
|
|
/*
|
|
* Kernel interfaces
|
|
*/
|
|
static const struct file_operations hpwdt_fops = {
|
|
.owner = THIS_MODULE,
|
|
.llseek = no_llseek,
|
|
.write = hpwdt_write,
|
|
.unlocked_ioctl = hpwdt_ioctl,
|
|
.open = hpwdt_open,
|
|
.release = hpwdt_release,
|
|
};
|
|
|
|
static struct miscdevice hpwdt_miscdev = {
|
|
.minor = WATCHDOG_MINOR,
|
|
.name = "watchdog",
|
|
.fops = &hpwdt_fops,
|
|
};
|
|
|
|
static struct notifier_block die_notifier = {
|
|
.notifier_call = hpwdt_pretimeout,
|
|
.priority = 0,
|
|
};
|
|
|
|
/*
|
|
* Init & Exit
|
|
*/
|
|
|
|
#ifdef ARCH_HAS_NMI_WATCHDOG
|
|
static void __devinit hpwdt_check_nmi_sourcing(struct pci_dev *dev)
|
|
{
|
|
/*
|
|
* If nmi_watchdog is turned off then we can turn on
|
|
* our nmi sourcing capability.
|
|
*/
|
|
if (!nmi_watchdog_active())
|
|
hpwdt_nmi_sourcing = 1;
|
|
else
|
|
dev_warn(&dev->dev, "NMI sourcing is disabled. To enable this "
|
|
"functionality you must reboot with nmi_watchdog=0 "
|
|
"and load the hpwdt driver with priority=1.\n");
|
|
}
|
|
#else
|
|
static void __devinit hpwdt_check_nmi_sourcing(struct pci_dev *dev)
|
|
{
|
|
dev_warn(&dev->dev, "NMI sourcing is disabled. "
|
|
"Your kernel does not support a NMI Watchdog.\n");
|
|
}
|
|
#endif
|
|
|
|
static int __devinit hpwdt_init_one(struct pci_dev *dev,
|
|
const struct pci_device_id *ent)
|
|
{
|
|
int retval;
|
|
|
|
/*
|
|
* Check if we can do NMI sourcing or not
|
|
*/
|
|
hpwdt_check_nmi_sourcing(dev);
|
|
|
|
/*
|
|
* First let's find out if we are on an iLO2+ server. We will
|
|
* not run on a legacy ASM box.
|
|
* So we only support the G5 ProLiant servers and higher.
|
|
*/
|
|
if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) {
|
|
dev_warn(&dev->dev,
|
|
"This server does not have an iLO2+ ASIC.\n");
|
|
return -ENODEV;
|
|
}
|
|
|
|
if (pci_enable_device(dev)) {
|
|
dev_warn(&dev->dev,
|
|
"Not possible to enable PCI Device: 0x%x:0x%x.\n",
|
|
ent->vendor, ent->device);
|
|
return -ENODEV;
|
|
}
|
|
|
|
pci_mem_addr = pci_iomap(dev, 1, 0x80);
|
|
if (!pci_mem_addr) {
|
|
dev_warn(&dev->dev,
|
|
"Unable to detect the iLO2+ server memory.\n");
|
|
retval = -ENOMEM;
|
|
goto error_pci_iomap;
|
|
}
|
|
hpwdt_timer_reg = pci_mem_addr + 0x70;
|
|
hpwdt_timer_con = pci_mem_addr + 0x72;
|
|
|
|
/* Make sure that we have a valid soft_margin */
|
|
if (hpwdt_change_timer(soft_margin))
|
|
hpwdt_change_timer(DEFAULT_MARGIN);
|
|
|
|
/*
|
|
* We need to map the ROM to get the CRU service.
|
|
* For 32 bit Operating Systems we need to go through the 32 Bit
|
|
* BIOS Service Directory
|
|
* For 64 bit Operating Systems we get that service through SMBIOS.
|
|
*/
|
|
retval = detect_cru_service();
|
|
if (retval < 0) {
|
|
dev_warn(&dev->dev,
|
|
"Unable to detect the %d Bit CRU Service.\n",
|
|
HPWDT_ARCH);
|
|
goto error_get_cru;
|
|
}
|
|
|
|
/*
|
|
* We know this is the only CRU call we need to make so lets keep as
|
|
* few instructions as possible once the NMI comes in.
|
|
*/
|
|
cmn_regs.u1.rah = 0x0D;
|
|
cmn_regs.u1.ral = 0x02;
|
|
|
|
/*
|
|
* If the priority is set to 1, then we will be put first on the
|
|
* die notify list to handle a critical NMI. The default is to
|
|
* be last so other users of the NMI signal can function.
|
|
*/
|
|
if (priority)
|
|
die_notifier.priority = 0x7FFFFFFF;
|
|
|
|
retval = register_die_notifier(&die_notifier);
|
|
if (retval != 0) {
|
|
dev_warn(&dev->dev,
|
|
"Unable to register a die notifier (err=%d).\n",
|
|
retval);
|
|
goto error_die_notifier;
|
|
}
|
|
|
|
retval = misc_register(&hpwdt_miscdev);
|
|
if (retval < 0) {
|
|
dev_warn(&dev->dev,
|
|
"Unable to register miscdev on minor=%d (err=%d).\n",
|
|
WATCHDOG_MINOR, retval);
|
|
goto error_misc_register;
|
|
}
|
|
|
|
printk(KERN_INFO
|
|
"hp Watchdog Timer Driver: %s"
|
|
", timer margin: %d seconds (nowayout=%d)"
|
|
", allow kernel dump: %s (default = 0/OFF)"
|
|
", priority: %s (default = 0/LAST).\n",
|
|
HPWDT_VERSION, soft_margin, nowayout,
|
|
(allow_kdump == 0) ? "OFF" : "ON",
|
|
(priority == 0) ? "LAST" : "FIRST");
|
|
|
|
return 0;
|
|
|
|
error_misc_register:
|
|
unregister_die_notifier(&die_notifier);
|
|
error_die_notifier:
|
|
if (cru_rom_addr)
|
|
iounmap(cru_rom_addr);
|
|
error_get_cru:
|
|
pci_iounmap(dev, pci_mem_addr);
|
|
error_pci_iomap:
|
|
pci_disable_device(dev);
|
|
return retval;
|
|
}
|
|
|
|
static void __devexit hpwdt_exit(struct pci_dev *dev)
|
|
{
|
|
if (!nowayout)
|
|
hpwdt_stop();
|
|
|
|
misc_deregister(&hpwdt_miscdev);
|
|
unregister_die_notifier(&die_notifier);
|
|
|
|
if (cru_rom_addr)
|
|
iounmap(cru_rom_addr);
|
|
pci_iounmap(dev, pci_mem_addr);
|
|
pci_disable_device(dev);
|
|
}
|
|
|
|
static struct pci_driver hpwdt_driver = {
|
|
.name = "hpwdt",
|
|
.id_table = hpwdt_devices,
|
|
.probe = hpwdt_init_one,
|
|
.remove = __devexit_p(hpwdt_exit),
|
|
};
|
|
|
|
static void __exit hpwdt_cleanup(void)
|
|
{
|
|
pci_unregister_driver(&hpwdt_driver);
|
|
}
|
|
|
|
static int __init hpwdt_init(void)
|
|
{
|
|
return pci_register_driver(&hpwdt_driver);
|
|
}
|
|
|
|
MODULE_AUTHOR("Tom Mingarelli");
|
|
MODULE_DESCRIPTION("hp watchdog driver");
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_VERSION(HPWDT_VERSION);
|
|
MODULE_ALIAS_MISCDEV(WATCHDOG_MINOR);
|
|
|
|
module_param(soft_margin, int, 0);
|
|
MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
|
|
|
|
module_param(nowayout, int, 0);
|
|
MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
|
|
__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
|
|
|
|
module_param(allow_kdump, int, 0);
|
|
MODULE_PARM_DESC(allow_kdump, "Start a kernel dump after NMI occurs");
|
|
|
|
module_param(priority, int, 0);
|
|
MODULE_PARM_DESC(priority, "The hpwdt driver handles NMIs first or last"
|
|
" (default = 0/Last)\n");
|
|
|
|
module_init(hpwdt_init);
|
|
module_exit(hpwdt_cleanup);
|