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Message-ID: <20071015182606.GA23822@pazke.donpac.ru>
Date: Mon, 15 Oct 2007 22:26:06 +0400
From: Andrey Panin <pazke@...pac.ru>
To: thomas.mingarelli@...com
Cc: linux-kernel@...r.kernel.org
Subject: Re: [HP ProLiant WatchDog driver] hpwdt HP WatchDog Patch
On 288, 10 15, 2007 at 02:05:50PM -0400, thomas.mingarelli@...com wrote:
> Hp is providing a Hardware WatchDog Timer driver that will only work with the
> specific HW Timer located in the HP ProLiant iLO 2 ASIC. The iLO 2 HW Timer
> will generate a Non-maskable Interrupt (NMI) 9 seconds before physically
> resetting the server, by removing power, so that the event can be logged to
> the HP Integrated Management Log (IML), a Non-Volatile Random Access Memory
> (NVRAM). The logging of the event is performed using the HP ProLiant ROM via
> an Industry Standard access known as a BIOS Service Directory Entry.
Isn't this functionality available already via IPMI ?
>
> --- linux-2.6.23.1/drivers/char/watchdog/Makefile.orig 2007-10-12 11:43:44.000000000 -0500
> +++ linux-2.6.23.1/drivers/char/watchdog/Makefile 2007-10-15 07:56:31.000000000 -0500
> @@ -118,3 +118,10 @@
>
> # Architecture Independant
> obj-$(CONFIG_SOFT_WATCHDOG) += softdog.o
> +
> +#
> +# Makefile for the hp WatchDog driver.
> +#
> +CFLAGS_hpwdt.o += -O
> +obj-$(CONFIG_HP_WATCHDOG) += hpwdt.o
> +
> --- linux-2.6.23.1/drivers/char/watchdog/Kconfig.orig 2007-10-12 11:43:44.000000000 -0500
> +++ linux-2.6.23.1/drivers/char/watchdog/Kconfig 2007-10-15 07:57:27.000000000 -0500
> @@ -55,6 +55,19 @@
> To compile this driver as a module, choose M here: the
> module will be called softdog.
>
> +config HP_WATCHDOG
> + tristate "Hewlett-Packard watchdog"
> + depends on WATCHDOG && X86
> + help
> + A software monitoring watchdog and NMI sourcing driver. This driver
> + will detect lockups and provide stack trace. Also, when an NMI
> + occurs this driver will make the necessary BIOS calls to log
> + the cause of the NMI. This is a driver that will only load on a
> + HP ProLiant system with a minimum of iLO2 support.
> + To compile this driver as a module, choose M here: the
> + module will be called hpwdt.
> +
> +
> # ALPHA Architecture
>
> # ARM Architecture
> --- linux-2.6.23.1/drivers/char/watchdog/hpwdt.c.orig 2007-10-15 07:53:12.000000000 -0500
> +++ linux-2.6.23.1/drivers/char/watchdog/hpwdt.c 2007-10-15 07:53:12.000000000 -0500
> @@ -1 +1,877 @@
> +/*
> + * 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@...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/fs.h>
> +#include <linux/init.h>
> +#include <linux/interrupt.h>
> +#include <linux/kdebug.h>
> +#include <linux/kernel.h>
> +#include <linux/miscdevice.h>
> +#include <linux/mm.h>
> +#include <linux/module.h>
> +#include <linux/moduleparam.h>
> +#include <linux/notifier.h>
> +#include <linux/pci.h>
> +#include <linux/pci_ids.h>
> +#include <linux/reboot.h>
> +#include <linux/sched.h>
> +#include <linux/timer.h>
> +#include <linux/types.h>
> +#include <linux/watchdog.h>
> +#include <asm/desc.h>
> +#include <asm/io.h>
> +#include <asm/irq.h>
> +#include <asm/uaccess.h>
> +
> +#define PCI_BIOS32_SD_VALUE 0x5F32335F
> +#define CRU_BIOS_SIGNATURE_VALUE 0x55524324
> +#define PCI_BIOS32_PARAGRAPH_LEN 16
> +#define PCI_ROM_BASE1 0x000F0000
> +#define ROM_SIZE 0x0FFFF
> +
> +typedef struct _BIOS32_SERVICE_DIRECTORY {
> + u32 signature;
> + u32 entry_point;
> + u8 revision;
> + u8 length;
> + u8 checksum;
> + u8 reserved[5];
> +} BIOS32_SERVICE_DIRECTORY, *PBIOS32_SERVICE_DIRECTORY;
> +
> +
> +/*
> + * SMBIOSEntryPoint - defines SMBIOS entry point structure
> + *
> + * anchor_string[4] - anchor string (_SM_)
> + * check_sum - checksum of the entry point structure
> + * length - length of the entry point structure
> + * major_ver - major version (02h for revision 2.1)
> + * minor_ver - minor version (01h for revision 2.1)
> + * max_struct_size - size of the largest SMBIOS structure
> + * revision - entry point structure revision implemented
> + * reserved[5] - reserved
> + * intermediate_anchor[5] - intermediate anchor string (_DM_)
> + * intermediate_check_sum - intermediate checksum
> + * table_length - structure table length
> + * table_address - structure table address
> + * number_structs - number of structures present
> + * bcd_revision - BCD revision
> + */
> +typedef struct _SMBIOSEntryPoint {
> + u8 anchor_string[4];
> + u8 check_sum;
> + u8 length;
> + u8 major_ver;
> + u8 minor_ver;
> + u16 max_struct_size;
> + u8 revision;
> + u8 reserved[5];
> + u8 intermediate_anchor[5];
> + u8 intermediate_check_sum;
> + u16 table_length;
> + u64 table_address;
> + u16 number_structs;
> + u8 bcd_revision;
> +}SMBIOSEntryPoint;
> +
> +
> +/* type 212 */
> +typedef struct _CQSMBIOS_CRU64_INFO {
> + u8 type;
> + u8 byte_length;
> + u16 handle;
> + u32 signature;
> + u64 physical_address;
> + u32 double_length;
> + u32 double_offset;
> +} CQSMBIOS_CRU64_INFO, *PCQSMBIOS_CRU64_INFO;
> +
> +typedef struct _SMBIOS_HEADER {
> + u8 byte_type;
> + u8 byte_length;
> + u16 handle;
> +} SMBIOS_HEADER, *PSMBIOS_HEADER;
> +
> +#pragma pack(1)
> +typedef struct _CMN_REGISTERS {
> + union {
> + struct {
> + u8 ral;
> + u8 rah;
> + u16 rea2;
> + } s1;
> + u32 reax;
> + } u1;
> + union {
> + struct {
> + u8 rbl;
> + u8 rbh;
> + u8 reb2l;
> + u8 reb2h;
> + } s1;
> + u32 rebx;
> + } u2;
> + union {
> + struct {
> + u8 rcl;
> + u8 rch;
> + u16 rec2;
> + } s1;
> + u32 recx;
> + } u3;
> + union {
> + struct {
> + u8 rdl;
> + u8 rdh;
> + u16 red2;
> + } s1;
> + u32 redx;
> + } u4;
> +
> + u32 resi;
> + u32 redi;
> + u16 rds;
> + u16 res;
> + u32 reflags;
> +} CMN_REGISTERS, *PCMN_REGISTERS;
> +#pragma pack()
> +
> +#define CQSMBIOS_CRU64_INFORMATION 212
> +
> +static unsigned int soft_margin = 2; /* in minutes */
> +static unsigned long *hpwdt_timer_reg;
> +static unsigned long *hpwdt_timer_con;
> +static unsigned int reload;
> +static unsigned int new_margin;
> +static u16 tbl_len;
> +static u64 tbl_addr;
> +static int die_reg;
> +static int pci_enable;
> +
> +static DEFINE_SPINLOCK(rom_lock);
> +
> +static void *gpVirtRomCRUAddr;
> +static void *gpBios32Map;
> +static unsigned char *gpBios32EntryPoint;
> +static void *p_mem_addr;
> +
> +static int hpwdt_pretimeout(struct notifier_block *, unsigned long, void *);
> +static CMN_REGISTERS cmn_regs;
> +
> +static struct pci_device_id hpwdt_devices[] = {
> + {
> + .vendor = PCI_VENDOR_ID_COMPAQ,
> + .device = 0xB203,
> + .subvendor = PCI_ANY_ID,
> + .subdevice = PCI_ANY_ID,
> + },
> + {0}, /* terminate list */
> +};
> +
> +MODULE_DEVICE_TABLE(pci, hpwdt_devices);
> +
> +asmlinkage void asminline_call(PCMN_REGISTERS pi86Regs,
> + unsigned long *pRomEntry)
> +{
> +#ifdef CONFIG_X86_64
> + asm("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"
> + "popfq \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");
> +#endif
> +
> +#ifdef CONFIG_X86_32
> + asm("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");
> +#endif
> +}
> +
> +/*
> + * smbios_get_record
> + *
> + * Routine Description:
> + * This function will get the next record in the SMB Tables
> + *
> + * Return Value:
> + * 1 : SUCCESS - if record found
> + * 0 : FAILURE - if record not found
> + */
> +int smbios_get_record(unsigned char **ppRecord, void *smbios_table_ptr)
> +{
> + unsigned char *buffer;
> + PSMBIOS_HEADER header_ptr;
> +
> + /*
> + * if ppRecord is NULL, find the first record
> + */
> + if (*ppRecord == 0) {
> + *ppRecord = smbios_table_ptr;
> + buffer = smbios_table_ptr;
> + } else {
> + header_ptr = (PSMBIOS_HEADER) * ppRecord;
> + buffer = *ppRecord;
> +
> + /*
> + * skip over the structure itself
> + */
> + *ppRecord += header_ptr->byte_length;
> +
> + buffer += header_ptr->byte_length;
> +
> + /*
> + * skip over any strings following the structure
> + */
> + while (*buffer || *(buffer + 1))
> + buffer++;
> +
> + /*
> + * skip over the double NULL characters
> + */
> + buffer += 2;
> + }
> + if (buffer >= ((unsigned char *)smbios_table_ptr + tbl_len))
> + return 0;
> +
> + *ppRecord = buffer;
> + return 1;
> +}
> +
> +/*
> + * smbios_get_record_by_type
> + *
> + * Routine Description:
> + * This function will get a record in the SMB Table by the type specified
> + *
> + * Return Value:
> + * 1 : SUCCESS - if record found
> + * 0 : FAILURE - if record not found
> + */
> +int smbios_get_record_by_type(unsigned char type, unsigned short copy,
> + void **ppRecord, void *smbios_table_ptr)
> +{
> + unsigned char *save_state_ptr = NULL;
> + PSMBIOS_HEADER header_ptr;
> +
> + while (smbios_get_record(&save_state_ptr, smbios_table_ptr)) {
> + header_ptr = (PSMBIOS_HEADER) save_state_ptr;
> + if (header_ptr->byte_type == type) {
> + if (copy == 0) {
> + *ppRecord = (void *)save_state_ptr;
> + return 1;
> + } else
> + copy--;
> + }
> + }
> + return 0;
> +}
> +
> +/*
> + * smbios_get_64bit_cru_info
> + *
> + * Routine Description:
> + * This routine will collect the 64bit CRU entry point from SMBIOS
> + * table.
> + *
> + * Return Value:
> + * 0 : SUCCESS
> + * <0 : FAILURE
> + */
> +int __devinit smbios_get_64bit_cru_info(void)
> +{
> + unsigned short copy;
> + unsigned char *record_ptr = NULL;
> + PCQSMBIOS_CRU64_INFO smbios_cru64_ptr;
> + unsigned long cru_physical_address;
> + void *smbios_table_ptr;
> + int retval = -ENOMEM;
> +
> + smbios_table_ptr = ioremap((unsigned int)tbl_addr, tbl_len);
> + if (!smbios_table_ptr)
> + return retval;
> +
> + copy = 0;
> + while (smbios_get_record_by_type
> + (CQSMBIOS_CRU64_INFORMATION, copy, (void *)&record_ptr,
> + smbios_table_ptr)) {
> + /*
> + * In the event the ROM has a bug, let's print this
> + * out and quit before we get into trouble.
> + */
> + if (!record_ptr) {
> + printk(KERN_WARNING
> + "hpwdt: smbios: Missing CQSMBIOS_CRU64_INFO!\n");
> + retval = -ENODEV;
> + break;
> + }
> + smbios_cru64_ptr = (PCQSMBIOS_CRU64_INFO) record_ptr;
> + if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) {
> +
> + cru_physical_address =
> + smbios_cru64_ptr->physical_address +
> + smbios_cru64_ptr->double_offset;
> + gpVirtRomCRUAddr =
> + ioremap((unsigned long)cru_physical_address,
> + smbios_cru64_ptr->double_length);
> + if (gpVirtRomCRUAddr)
> + retval = 0;
> + break;
> + }
> + }
> +
> + iounmap(smbios_table_ptr);
> + return retval;
> +}
> +
> +/*
> + * smbios_detect
> + *
> + * Routine Description:
> + * This function parses SMBIOS to retrieve the 64 bit CRU Service.
> + *
> + * Return Value:
> + * 0 : SUCCESS
> + * <0 : FAILURE
> + */
> +int smbios_detect(void)
> +{
> + unsigned char *p_virtual_rom;
> + unsigned char *p;
> + SMBIOSEntryPoint *pEPS;
> + int retval = -ENOMEM;
> +
> + /*
> + * Search from 0x0f0000 through 0x0fffff, inclusive.
> + */
> + p_virtual_rom = ioremap(PCI_ROM_BASE1, ROM_SIZE);
> + if (!p_virtual_rom)
> + return retval;
> +
> + for (p = p_virtual_rom; p < p_virtual_rom + ROM_SIZE; p += 16) {
> + pEPS = (SMBIOSEntryPoint *) p;
> + if ((strncmp((char *)pEPS->anchor_string, "_SM_",
> + sizeof(pEPS->anchor_string))) == 0) {
> + tbl_addr = pEPS->table_address;
> + tbl_len = pEPS->table_length;
> + retval = 0;
> + break;
> + }
> + }
> + iounmap(p_virtual_rom);
> + return retval;
> +}
> +
> +/*
> + * 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
> + */
> +int __devinit cru_detect(void)
> +{
> + unsigned long cru_physical_address;
> + unsigned long cru_length;
> + unsigned long physical_bios_base = 0;
> + unsigned long physical_bios_offset = 0;
> + int retval = -ENODEV;
> +
> + memset(&cmn_regs, 0, sizeof(CMN_REGISTERS));
> +
> + cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE;
> +
> + asminline_call(&cmn_regs, (unsigned long *)gpBios32EntryPoint);
> +
> + if (cmn_regs.u1.s1.ral != 0) {
> + printk(KERN_WARNING
> + "hpwdt: Call succeeded but with an error: 0x%x\n",
> + cmn_regs.u1.s1.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)) {
> + gpVirtRomCRUAddr =
> + ioremap(cru_physical_address, cru_length);
> + if (gpVirtRomCRUAddr)
> + 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: 0x%x\n",
> + (unsigned int)&gpVirtRomCRUAddr);
> + }
> + iounmap(gpBios32Map);
> + return retval;
> +}
> +
> +/*
> + * valid_checksum
> + */
> +static int valid_checksum(void *header_ptr, unsigned char size)
> +{
> + unsigned char i;
> + unsigned char check_sum = 0;
> + unsigned char *ptr = header_ptr;
> +
> + /*
> + * calculate checksum of size bytes. This should add up
> + * to zero if we have a valid header.
> + */
> + for (i = 0; i < size; i++, ptr++)
> + check_sum = (check_sum + (*ptr));
> +
> + return ((check_sum == 0) && (size > 0));
> +}
> +
> +/*
> + * check_for_bios32_support
> + *
> + * Routine Description:
> + * This function determine if a pointer is pointing to the
> + * 32 bit BIOS Directory Services entry in ROM space.
> + *
> + * Return Value:
> + * 1 - if found the correct signature
> + * 0 - unable to find _32_
> + */
> +static int check_for_bios32_support(PBIOS32_SERVICE_DIRECTORY bios_32_ptr)
> +{
> + /*
> + * 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) {
> + if (valid_checksum((void *)bios_32_ptr,
> + ((unsigned char)(bios_32_ptr->length *
> + PCI_BIOS32_PARAGRAPH_LEN))))
> + return 1;
> + }
> + return 0;
> +}
> +
> +/*
> + * find_32bit_bios_sd
> + *
> + * Routine Description:
> + * This function find the 32-bit BIOS Service Directory
> + *
> + * Return Value:
> + * 0 : SUCCESS
> + * <0 : FAILURE
> + */
> +int __devinit find_32bit_bios_sd(void)
> +{
> + PBIOS32_SERVICE_DIRECTORY bios_32_data_ptr;
> + unsigned long map_entry, map_offset;
> + void *pRomVirtAddr;
> + unsigned char *p;
> + int retval = -ENOMEM;
> +
> + pRomVirtAddr = ioremap(PCI_ROM_BASE1, ROM_SIZE);
> + if (!pRomVirtAddr) {
> + printk(KERN_WARNING "hpwdt: Unable to map in BIOS ROM.\n");
> + return retval;
> + }
> +
> + /*
> + * BIOS32 spec indicates that the signature will be
> + * paragraph-aligned, so we'll skip by 16 bytes each pass
> + * through the loop.
> + */
> + for (p = pRomVirtAddr;
> + p < ((unsigned char *)pRomVirtAddr + ROM_SIZE); p += 16) {
> +
> + if (!check_for_bios32_support((PBIOS32_SERVICE_DIRECTORY) p))
> + continue;
> +
> + /* Found a Service Directory. */
> + bios_32_data_ptr = (PBIOS32_SERVICE_DIRECTORY) p;
> +
> + /*
> + * 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_data_ptr->entry_point & ~(PAGE_SIZE - 1);
> + map_offset = bios_32_data_ptr->entry_point - map_entry;
> +
> + gpBios32Map = ioremap(map_entry, (2 * PAGE_SIZE));
> +
> + if (gpBios32Map) {
> + /* This will be unmapped in cru_detect. */
> + gpBios32EntryPoint = gpBios32Map + map_offset;
> + retval = 0;
> + }
> + break;
> + }
> + iounmap(pRomVirtAddr);
> + return retval;
> +}
> +
> +static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason,
> + void *dummy)
> +{
> + static unsigned long rom_pl;
> + static int die_nmi_called = 0;
> +
> + if (ulReason == DIE_NMI || ulReason == DIE_NMI_IPI) {
> + spin_lock_irqsave(&rom_lock, rom_pl);
> + if (!die_nmi_called)
> + asminline_call(&cmn_regs, gpVirtRomCRUAddr);
> + die_nmi_called = 1;
> + spin_unlock_irqrestore(&rom_lock, rom_pl);
> + if (cmn_regs.u1.s1.ral == 0) {
> + printk(KERN_WARNING "hpwdt: An NMI occurred, "
> + "but unable to determine source.\n");
> + } else {
> + panic("An NMI occurred, please see the Integrated "
> + "Management Log for details.\n");
> + }
> + }
> + return NOTIFY_STOP;
> +}
> +
> +/*
> + * Refresh the timer.
> + */
> +static void hpwdt_ping(void)
> +{
> + writew(reload, hpwdt_timer_reg);
> +}
> +
> +static int hpwdt_open(struct inode *inode, struct file *file)
> +{
> + reload = ((soft_margin * 60) * 1000) / 128;
> + /*
> + * Setting this bit is irreversible; once enabled, there is
> + * no way to disable the watchdog.
> + */
> + writew(0x85, hpwdt_timer_con);
> + return 0;
> +}
> +
> +/*
> + * Shut off the timer.
> + * Note: if we really have enabled the watchdog, there
> + * is no way to turn off.
> + */
> +static int hpwdt_release(struct inode *inode, struct file *file)
> +{
> + return 0;
> +}
> +
> +static ssize_t
> +hpwdt_write(struct file *file, const char *data, size_t len, loff_t * ppos)
> +{
> + /*
> + * Refresh the timer.
> + */
> + if (len)
> + hpwdt_ping();
> +
> + return len;
> +}
> +
> +static struct watchdog_info ident = {
> + .options = WDIOF_SETTIMEOUT,
> + .identity = "hp Watchdog",
> +};
> +
> +static long
> +hpwdt_ioctl(struct file *file, unsigned int cmd,
> + unsigned long arg)
> +{
> + int ret = -ENOIOCTLCMD;
> +
> + switch (cmd) {
> + case WDIOC_GETSUPPORT:
> + ret = 0;
> + if (copy_to_user((void *)arg, &ident, sizeof(ident)))
> + ret = -EFAULT;
> + break;
> +
> + case WDIOC_GETSTATUS:
> + ret = 0;
> + break;
> +
> + case WDIOC_GETBOOTSTATUS:
> + ret = put_user(0, (int *)arg);
> + break;
> +
> + case WDIOC_KEEPALIVE:
> + hpwdt_ping();
> + ret = 0;
> + break;
> +
> + case WDIOC_SETTIMEOUT:
> + ret = get_user(new_margin, (int *)arg);
> + if (ret)
> + break;
> +
> + /* Arbitrary, can't find the card's limits */
> + if (new_margin < 2 || new_margin > 30) {
> + ret = -EINVAL;
> + break;
> + }
> +
> + soft_margin = new_margin;
> + printk(KERN_DEBUG
> + "hpwdt: New timer passed in is %d minutes.\n",
> + new_margin);
> + reload = ((soft_margin * 60) * 1000) / 128;
> + hpwdt_ping();
> + /* Fall */
> + case WDIOC_GETTIMEOUT:
> + ret = put_user(new_margin, (int *)arg);
> + break;
> + }
> + return ret;
> +}
> +
> +static 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 = 0x7FFFFFFF,
> +};
> +
> +static int __devinit hpwdt_init_one(struct pci_dev *dev,
> + const struct pci_device_id *ent)
> +{
> + int retval;
> +
> + if (pci_enable_device(dev)) {
> + printk(KERN_WARNING
> + "hpwdt: Not possible to enable PCI Device\n");
> + return -ENODEV;
> + }
> + pci_enable = 1;
> +
> + /*
> + * First let's find out if we are on an iLO2 server. We will
> + * not run on a legacy ASM box.
> + */
> + if (dev->subsystem_vendor != PCI_VENDOR_ID_HP) {
> + printk(KERN_WARNING
> + "hpwdt: This server does not have an iLO2 ASIC.\n");
> + return -ENODEV;
> + }
> +
> + retval = misc_register(&hpwdt_miscdev);
> + if (retval < 0)
> + return retval;
> +
> + p_mem_addr = ioremap((unsigned long)pci_resource_start(dev, 1), 0x80);
> + if (!p_mem_addr) {
> + retval = -ENOMEM;
> + goto error_out;
> + }
> + hpwdt_timer_reg = (p_mem_addr + 0x70);
> + hpwdt_timer_con = (p_mem_addr + 0x72);
> +
> +#ifndef CONFIG_X86_64
> + /*
> + * Let's try to map in the ROM for 32 bit Operating Systems because
> + * we need get the CRU Service through the 32 Bit BIOS SD.
> + * This is not the case for 64 bit Operating Systems where we get
> + * that service through SMBIOS.
> + */
> + retval = find_32bit_bios_sd();
> + if (retval < 0) {
> + printk(KERN_WARNING
> + "hpwdt: No 32 Bit BIOS Service Directory found.\n");
> + goto error_out;
> + }
> +
> + retval = cru_detect();
> + if (retval < 0) {
> + printk(KERN_WARNING
> + "hpwdt: Unable to detect 32 Bit CRU Service.\n");
> + goto error_out;
> + }
> +#else
> + retval = smbios_detect();
> + if (retval < 0) {
> + printk(KERN_WARNING "hpwdt: No 64 Bit SMBIOS found.\n");
> + goto error_out;
> + }
> +
> + retval = smbios_get_64bit_cru_info();
> + if (retval < 0) {
> + printk(KERN_WARNING
> + "hpwdt: Unable to detect the 64 Bit CRU Service.\n");
> + goto error_out;
> + }
> +#endif
> + /*
> + * 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.
> + */
> + memset(&cmn_regs, 0, sizeof(CMN_REGISTERS));
> + cmn_regs.u1.s1.rah = 0x0D;
> + cmn_regs.u1.s1.ral = 0x02;
> +
> + retval = register_die_notifier(&die_notifier);
> + if (retval != 0) {
> + printk(KERN_WARNING
> + "hpwdt: Unable to register a die notifier.\n");
> + goto error_out;
> + }
> + die_reg = 1;
> +
> + new_margin = soft_margin;
> + printk("hp Watchdog Timer Driver: 1.00, timer margin: %d minutes\n",
> + new_margin);
> +
> + return 0;
> +error_out:
> + printk(KERN_WARNING "hpwdt: NMI support is not possible.\n");
> + misc_deregister(&hpwdt_miscdev);
> + if (pci_enable)
> + pci_disable_device(dev);
> + if (p_mem_addr)
> + iounmap(p_mem_addr);
> + if (gpVirtRomCRUAddr)
> + iounmap(gpVirtRomCRUAddr);
> + return retval;
> +}
> +
> +static void __devexit hpwdt_exit(struct pci_dev *dev)
> +{
> + if (die_reg)
> + unregister_die_notifier(&die_notifier);
> +
> + misc_deregister(&hpwdt_miscdev);
> + if (p_mem_addr)
> + iounmap(p_mem_addr);
> + if (gpVirtRomCRUAddr)
> + iounmap(gpVirtRomCRUAddr);
> +}
> +
> +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_ALIAS_MISCDEV(WATCHDOG_MINOR);
> +
> +module_param(soft_margin, int, 0);
> +MODULE_PARM_DESC(soft_margin, "Watchdog timeout in minutes");
> +
> +module_init(hpwdt_init);
> +module_exit(hpwdt_cleanup);
> -
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--
Andrey Panin | Linux and UNIX system administrator
pazke@...pac.ru | PGP key: wwwkeys.pgp.net
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