764 lines
18 KiB
C
764 lines
18 KiB
C
/*
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* HP WatchDog Driver
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* based on
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*
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* SoftDog 0.05: A Software Watchdog Device
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*
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* (c) Copyright 2007 Hewlett-Packard Development Company, L.P.
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* Thomas Mingarelli <thomas.mingarelli@hp.com>
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* version 2 as published by the Free Software Foundation
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*
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*/
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#include <linux/device.h>
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#include <linux/fs.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/io.h>
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#include <linux/irq.h>
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#include <linux/kernel.h>
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#include <linux/miscdevice.h>
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#include <linux/mm.h>
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#include <linux/module.h>
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#include <linux/kdebug.h>
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#include <linux/moduleparam.h>
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#include <linux/notifier.h>
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#include <linux/pci.h>
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#include <linux/pci_ids.h>
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#include <linux/reboot.h>
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#include <linux/sched.h>
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#include <linux/timer.h>
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#include <linux/types.h>
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#include <linux/uaccess.h>
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#include <linux/watchdog.h>
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#include <linux/dmi.h>
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#include <linux/efi.h>
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#include <linux/string.h>
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#include <linux/bootmem.h>
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#include <linux/slab.h>
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#include <asm/desc.h>
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#define PCI_BIOS32_SD_VALUE 0x5F32335F /* "_32_" */
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#define CRU_BIOS_SIGNATURE_VALUE 0x55524324
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#define PCI_BIOS32_PARAGRAPH_LEN 16
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#define PCI_ROM_BASE1 0x000F0000
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#define ROM_SIZE 0x10000
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struct bios32_service_dir {
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u32 signature;
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u32 entry_point;
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u8 revision;
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u8 length;
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u8 checksum;
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u8 reserved[5];
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};
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/* type 212 */
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struct smbios_cru64_info {
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u8 type;
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u8 byte_length;
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u16 handle;
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u32 signature;
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u64 physical_address;
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u32 double_length;
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u32 double_offset;
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};
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#define SMBIOS_CRU64_INFORMATION 212
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struct cmn_registers {
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union {
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struct {
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u8 ral;
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u8 rah;
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u16 rea2;
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};
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u32 reax;
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} u1;
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union {
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struct {
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u8 rbl;
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u8 rbh;
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u8 reb2l;
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u8 reb2h;
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};
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u32 rebx;
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} u2;
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union {
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struct {
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u8 rcl;
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u8 rch;
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u16 rec2;
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};
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u32 recx;
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} u3;
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union {
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struct {
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u8 rdl;
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u8 rdh;
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u16 red2;
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};
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u32 redx;
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} u4;
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u32 resi;
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u32 redi;
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u16 rds;
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u16 res;
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u32 reflags;
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} __attribute__((packed));
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#define DEFAULT_MARGIN 30
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static unsigned int soft_margin = DEFAULT_MARGIN; /* in seconds */
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static unsigned int reload; /* the computed soft_margin */
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static int nowayout = WATCHDOG_NOWAYOUT;
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static char expect_release;
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static unsigned long hpwdt_is_open;
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static void __iomem *pci_mem_addr; /* the PCI-memory address */
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static unsigned long __iomem *hpwdt_timer_reg;
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static unsigned long __iomem *hpwdt_timer_con;
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static DEFINE_SPINLOCK(rom_lock);
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static void *cru_rom_addr;
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static struct cmn_registers cmn_regs;
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static struct pci_device_id hpwdt_devices[] = {
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{
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.vendor = PCI_VENDOR_ID_COMPAQ,
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.device = 0xB203,
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.subvendor = PCI_ANY_ID,
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.subdevice = PCI_ANY_ID,
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},
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{0}, /* terminate list */
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};
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MODULE_DEVICE_TABLE(pci, hpwdt_devices);
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extern asmlinkage void asminline_call(struct cmn_registers *pi86Regs, unsigned long *pRomEntry);
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#ifndef CONFIG_X86_64
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/* --32 Bit Bios------------------------------------------------------------ */
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#define HPWDT_ARCH 32
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asm(".text \n\t"
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".align 4 \n"
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"asminline_call: \n\t"
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"pushl %ebp \n\t"
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"movl %esp, %ebp \n\t"
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"pusha \n\t"
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"pushf \n\t"
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"push %es \n\t"
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"push %ds \n\t"
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"pop %es \n\t"
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"movl 8(%ebp),%eax \n\t"
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"movl 4(%eax),%ebx \n\t"
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"movl 8(%eax),%ecx \n\t"
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"movl 12(%eax),%edx \n\t"
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"movl 16(%eax),%esi \n\t"
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"movl 20(%eax),%edi \n\t"
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"movl (%eax),%eax \n\t"
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"push %cs \n\t"
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"call *12(%ebp) \n\t"
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"pushf \n\t"
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"pushl %eax \n\t"
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"movl 8(%ebp),%eax \n\t"
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"movl %ebx,4(%eax) \n\t"
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"movl %ecx,8(%eax) \n\t"
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"movl %edx,12(%eax) \n\t"
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"movl %esi,16(%eax) \n\t"
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"movl %edi,20(%eax) \n\t"
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"movw %ds,24(%eax) \n\t"
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"movw %es,26(%eax) \n\t"
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"popl %ebx \n\t"
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"movl %ebx,(%eax) \n\t"
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"popl %ebx \n\t"
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"movl %ebx,28(%eax) \n\t"
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"pop %es \n\t"
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"popf \n\t"
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"popa \n\t"
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"leave \n\t"
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"ret \n\t"
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".previous");
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/*
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* cru_detect
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*
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* Routine Description:
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* This function uses the 32-bit BIOS Service Directory record to
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* search for a $CRU record.
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*
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* Return Value:
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* 0 : SUCCESS
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* <0 : FAILURE
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*/
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static int __devinit cru_detect(unsigned long map_entry,
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unsigned long map_offset)
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{
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void *bios32_map;
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unsigned long *bios32_entrypoint;
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unsigned long cru_physical_address;
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unsigned long cru_length;
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unsigned long physical_bios_base = 0;
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unsigned long physical_bios_offset = 0;
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int retval = -ENODEV;
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bios32_map = ioremap(map_entry, (2 * PAGE_SIZE));
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if (bios32_map == NULL)
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return -ENODEV;
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bios32_entrypoint = bios32_map + map_offset;
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cmn_regs.u1.reax = CRU_BIOS_SIGNATURE_VALUE;
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asminline_call(&cmn_regs, bios32_entrypoint);
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if (cmn_regs.u1.ral != 0) {
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printk(KERN_WARNING
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"hpwdt: Call succeeded but with an error: 0x%x\n",
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cmn_regs.u1.ral);
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} else {
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physical_bios_base = cmn_regs.u2.rebx;
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physical_bios_offset = cmn_regs.u4.redx;
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cru_length = cmn_regs.u3.recx;
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cru_physical_address =
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physical_bios_base + physical_bios_offset;
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/* If the values look OK, then map it in. */
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if ((physical_bios_base + physical_bios_offset)) {
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cru_rom_addr =
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ioremap(cru_physical_address, cru_length);
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if (cru_rom_addr)
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retval = 0;
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}
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printk(KERN_DEBUG "hpwdt: CRU Base Address: 0x%lx\n",
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physical_bios_base);
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printk(KERN_DEBUG "hpwdt: CRU Offset Address: 0x%lx\n",
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physical_bios_offset);
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printk(KERN_DEBUG "hpwdt: CRU Length: 0x%lx\n",
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cru_length);
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printk(KERN_DEBUG "hpwdt: CRU Mapped Address: 0x%x\n",
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(unsigned int)&cru_rom_addr);
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}
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iounmap(bios32_map);
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return retval;
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}
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/*
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* bios_checksum
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*/
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static int __devinit bios_checksum(const char __iomem *ptr, int len)
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{
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char sum = 0;
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int i;
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/*
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* calculate checksum of size bytes. This should add up
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* to zero if we have a valid header.
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*/
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for (i = 0; i < len; i++)
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sum += ptr[i];
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return ((sum == 0) && (len > 0));
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}
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/*
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* bios32_present
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*
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* Routine Description:
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* This function finds the 32-bit BIOS Service Directory
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*
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* Return Value:
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* 0 : SUCCESS
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* <0 : FAILURE
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*/
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static int __devinit bios32_present(const char __iomem *p)
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{
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struct bios32_service_dir *bios_32_ptr;
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int length;
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unsigned long map_entry, map_offset;
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bios_32_ptr = (struct bios32_service_dir *) p;
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/*
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* Search for signature by checking equal to the swizzled value
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* instead of calling another routine to perform a strcmp.
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*/
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if (bios_32_ptr->signature == PCI_BIOS32_SD_VALUE) {
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length = bios_32_ptr->length * PCI_BIOS32_PARAGRAPH_LEN;
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if (bios_checksum(p, length)) {
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/*
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* According to the spec, we're looking for the
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* first 4KB-aligned address below the entrypoint
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* listed in the header. The Service Directory code
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* is guaranteed to occupy no more than 2 4KB pages.
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*/
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map_entry = bios_32_ptr->entry_point & ~(PAGE_SIZE - 1);
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map_offset = bios_32_ptr->entry_point - map_entry;
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return cru_detect(map_entry, map_offset);
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}
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}
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return -ENODEV;
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}
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static int __devinit detect_cru_service(void)
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{
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char __iomem *p, *q;
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int rc = -1;
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/*
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* Search from 0x0f0000 through 0x0fffff, inclusive.
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*/
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p = ioremap(PCI_ROM_BASE1, ROM_SIZE);
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if (p == NULL)
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return -ENOMEM;
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for (q = p; q < p + ROM_SIZE; q += 16) {
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rc = bios32_present(q);
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if (!rc)
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break;
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}
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iounmap(p);
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return rc;
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}
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#else
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/* --64 Bit Bios------------------------------------------------------------ */
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#define HPWDT_ARCH 64
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asm(".text \n\t"
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".align 4 \n"
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"asminline_call: \n\t"
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"pushq %rbp \n\t"
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"movq %rsp, %rbp \n\t"
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"pushq %rax \n\t"
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"pushq %rbx \n\t"
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"pushq %rdx \n\t"
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"pushq %r12 \n\t"
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"pushq %r9 \n\t"
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"movq %rsi, %r12 \n\t"
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"movq %rdi, %r9 \n\t"
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"movl 4(%r9),%ebx \n\t"
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"movl 8(%r9),%ecx \n\t"
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"movl 12(%r9),%edx \n\t"
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"movl 16(%r9),%esi \n\t"
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"movl 20(%r9),%edi \n\t"
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"movl (%r9),%eax \n\t"
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"call *%r12 \n\t"
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"pushfq \n\t"
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"popq %r12 \n\t"
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"popfq \n\t"
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"movl %eax, (%r9) \n\t"
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"movl %ebx, 4(%r9) \n\t"
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"movl %ecx, 8(%r9) \n\t"
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"movl %edx, 12(%r9) \n\t"
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"movl %esi, 16(%r9) \n\t"
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"movl %edi, 20(%r9) \n\t"
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"movq %r12, %rax \n\t"
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"movl %eax, 28(%r9) \n\t"
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"popq %r9 \n\t"
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"popq %r12 \n\t"
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"popq %rdx \n\t"
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"popq %rbx \n\t"
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"popq %rax \n\t"
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"leave \n\t"
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"ret \n\t"
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".previous");
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/*
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* dmi_find_cru
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*
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* Routine Description:
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* This function checks whether or not a SMBIOS/DMI record is
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* the 64bit CRU info or not
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*/
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static void __devinit dmi_find_cru(const struct dmi_header *dm)
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{
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struct smbios_cru64_info *smbios_cru64_ptr;
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unsigned long cru_physical_address;
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if (dm->type == SMBIOS_CRU64_INFORMATION) {
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smbios_cru64_ptr = (struct smbios_cru64_info *) dm;
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if (smbios_cru64_ptr->signature == CRU_BIOS_SIGNATURE_VALUE) {
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cru_physical_address =
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smbios_cru64_ptr->physical_address +
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smbios_cru64_ptr->double_offset;
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cru_rom_addr = ioremap(cru_physical_address,
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smbios_cru64_ptr->double_length);
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}
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}
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}
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static int __devinit detect_cru_service(void)
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{
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cru_rom_addr = NULL;
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dmi_walk(dmi_find_cru);
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/* if cru_rom_addr has been set then we found a CRU service */
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return ((cru_rom_addr != NULL) ? 0: -ENODEV);
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}
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/* ------------------------------------------------------------------------- */
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#endif
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/*
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* NMI Handler
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*/
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static int hpwdt_pretimeout(struct notifier_block *nb, unsigned long ulReason,
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void *data)
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{
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unsigned long rom_pl;
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static int die_nmi_called;
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if (ulReason != DIE_NMI && ulReason != DIE_NMI_IPI)
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return NOTIFY_OK;
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spin_lock_irqsave(&rom_lock, rom_pl);
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if (!die_nmi_called)
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asminline_call(&cmn_regs, cru_rom_addr);
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die_nmi_called = 1;
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spin_unlock_irqrestore(&rom_lock, rom_pl);
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if (cmn_regs.u1.ral == 0) {
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printk(KERN_WARNING "hpwdt: An NMI occurred, "
|
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"but unable to determine source.\n");
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} else {
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panic("An NMI occurred, please see the Integrated "
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"Management Log for details.\n");
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}
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|
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return NOTIFY_STOP;
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}
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|
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/*
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* Watchdog operations
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*/
|
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static void hpwdt_start(void)
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{
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reload = (soft_margin * 1000) / 128;
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iowrite16(reload, hpwdt_timer_reg);
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iowrite16(0x85, hpwdt_timer_con);
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}
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|
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static void hpwdt_stop(void)
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{
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unsigned long data;
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data = ioread16(hpwdt_timer_con);
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data &= 0xFE;
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iowrite16(data, hpwdt_timer_con);
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}
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|
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static void hpwdt_ping(void)
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{
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iowrite16(reload, hpwdt_timer_reg);
|
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}
|
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|
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static int hpwdt_change_timer(int new_margin)
|
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{
|
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/* Arbitrary, can't find the card's limits */
|
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if (new_margin < 30 || new_margin > 600) {
|
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printk(KERN_WARNING
|
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"hpwdt: New value passed in is invalid: %d seconds.\n",
|
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new_margin);
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return -EINVAL;
|
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}
|
|
|
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soft_margin = new_margin;
|
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printk(KERN_DEBUG
|
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"hpwdt: New timer passed in is %d seconds.\n",
|
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new_margin);
|
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reload = (soft_margin * 1000) / 128;
|
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|
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return 0;
|
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}
|
|
|
|
/*
|
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* /dev/watchdog handling
|
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*/
|
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static int hpwdt_open(struct inode *inode, struct file *file)
|
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{
|
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/* /dev/watchdog can only be opened once */
|
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if (test_and_set_bit(0, &hpwdt_is_open))
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return -EBUSY;
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|
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/* Start the watchdog */
|
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hpwdt_start();
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hpwdt_ping();
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|
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return nonseekable_open(inode, file);
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}
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|
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static int hpwdt_release(struct inode *inode, struct file *file)
|
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{
|
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/* Stop the watchdog */
|
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if (expect_release == 42) {
|
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hpwdt_stop();
|
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} else {
|
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printk(KERN_CRIT
|
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"hpwdt: Unexpected close, not stopping watchdog!\n");
|
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hpwdt_ping();
|
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}
|
|
|
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expect_release = 0;
|
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|
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/* /dev/watchdog is being closed, make sure it can be re-opened */
|
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clear_bit(0, &hpwdt_is_open);
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|
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return 0;
|
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}
|
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|
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static ssize_t hpwdt_write(struct file *file, const char __user *data,
|
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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
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|
* 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 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 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,
|
|
};
|
|
|
|
/*
|
|
* Init & Exit
|
|
*/
|
|
|
|
static int __devinit hpwdt_init_one(struct pci_dev *dev,
|
|
const struct pci_device_id *ent)
|
|
{
|
|
int retval;
|
|
|
|
/*
|
|
* 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) {
|
|
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;
|
|
|
|
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: 1.00"
|
|
", timer margin: %d seconds( nowayout=%d).\n",
|
|
soft_margin, nowayout);
|
|
|
|
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_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_init(hpwdt_init);
|
|
module_exit(hpwdt_cleanup);
|