Automatic merge with /usr/src/ntfs-2.6.git.

1 files changed, 223 insertions, 0 deletions

diff --git a/arch/i386/kernel/crash.c b/arch/i386/kernel/crash.c
new file mode 100644
index 000000000000..e5fab12f7926
--- /dev/null
+++ b/arch/i386/kernel/crash.c
@@ -0,0 +1,223 @@
+/*
+ * Architecture specific (i386) functions for kexec based crash dumps.
+ *
+ * Created by: Hariprasad Nellitheertha (hari@in.ibm.com)
+ *
+ * Copyright (C) IBM Corporation, 2004. All rights reserved.
+ *
+ */
+
+#include <linux/init.h>
+#include <linux/types.h>
+#include <linux/kernel.h>
+#include <linux/smp.h>
+#include <linux/irq.h>
+#include <linux/reboot.h>
+#include <linux/kexec.h>
+#include <linux/irq.h>
+#include <linux/delay.h>
+#include <linux/elf.h>
+#include <linux/elfcore.h>
+
+#include <asm/processor.h>
+#include <asm/hardirq.h>
+#include <asm/nmi.h>
+#include <asm/hw_irq.h>
+#include <asm/apic.h>
+#include <mach_ipi.h>
+
+
+note_buf_t crash_notes[NR_CPUS];
+/* This keeps a track of which one is crashing cpu. */
+static int crashing_cpu;
+
+static u32 *append_elf_note(u32 *buf, char *name, unsigned type, void *data,
+                                                               size_t data_len)
+{
+        struct elf_note note;
+
+        note.n_namesz = strlen(name) + 1;
+        note.n_descsz = data_len;
+        note.n_type   = type;
+        memcpy(buf, &note, sizeof(note));
+        buf += (sizeof(note) +3)/4;
+        memcpy(buf, name, note.n_namesz);
+        buf += (note.n_namesz + 3)/4;
+        memcpy(buf, data, note.n_descsz);
+        buf += (note.n_descsz + 3)/4;
+
+        return buf;
+}
+
+static void final_note(u32 *buf)
+{
+        struct elf_note note;
+
+        note.n_namesz = 0;
+        note.n_descsz = 0;
+        note.n_type   = 0;
+        memcpy(buf, &note, sizeof(note));
+}
+
+static void crash_save_this_cpu(struct pt_regs *regs, int cpu)
+{
+        struct elf_prstatus prstatus;
+        u32 *buf;
+
+        if ((cpu < 0) || (cpu >= NR_CPUS))
+                return;
+
+        /* Using ELF notes here is opportunistic.
+         * I need a well defined structure format
+         * for the data I pass, and I need tags
+         * on the data to indicate what information I have
+         * squirrelled away.  ELF notes happen to provide
+         * all of that that no need to invent something new.
+         */
+        buf = &crash_notes[cpu][0];
+        memset(&prstatus, 0, sizeof(prstatus));
+        prstatus.pr_pid = current->pid;
+        elf_core_copy_regs(&prstatus.pr_reg, regs);
+        buf = append_elf_note(buf, "CORE", NT_PRSTATUS, &prstatus,
+                                sizeof(prstatus));
+        final_note(buf);
+}
+
+static void crash_get_current_regs(struct pt_regs *regs)
+{
+        __asm__ __volatile__("movl %%ebx,%0" : "=m"(regs->ebx));
+        __asm__ __volatile__("movl %%ecx,%0" : "=m"(regs->ecx));
+        __asm__ __volatile__("movl %%edx,%0" : "=m"(regs->edx));
+        __asm__ __volatile__("movl %%esi,%0" : "=m"(regs->esi));
+        __asm__ __volatile__("movl %%edi,%0" : "=m"(regs->edi));
+        __asm__ __volatile__("movl %%ebp,%0" : "=m"(regs->ebp));
+        __asm__ __volatile__("movl %%eax,%0" : "=m"(regs->eax));
+        __asm__ __volatile__("movl %%esp,%0" : "=m"(regs->esp));
+        __asm__ __volatile__("movw %%ss, %%ax;" :"=a"(regs->xss));
+        __asm__ __volatile__("movw %%cs, %%ax;" :"=a"(regs->xcs));
+        __asm__ __volatile__("movw %%ds, %%ax;" :"=a"(regs->xds));
+        __asm__ __volatile__("movw %%es, %%ax;" :"=a"(regs->xes));
+        __asm__ __volatile__("pushfl; popl %0" :"=m"(regs->eflags));
+
+        regs->eip = (unsigned long)current_text_addr();
+}
+
+/* CPU does not save ss and esp on stack if execution is already
+ * running in kernel mode at the time of NMI occurrence. This code
+ * fixes it.
+ */
+static void crash_setup_regs(struct pt_regs *newregs, struct pt_regs *oldregs)
+{
+        memcpy(newregs, oldregs, sizeof(*newregs));
+        newregs->esp = (unsigned long)&(oldregs->esp);
+        __asm__ __volatile__("xorl %eax, %eax;");
+        __asm__ __volatile__ ("movw %%ss, %%ax;" :"=a"(newregs->xss));
+}
+
+/* We may have saved_regs from where the error came from
+ * or it is NULL if via a direct panic().
+ */
+static void crash_save_self(struct pt_regs *saved_regs)
+{
+        struct pt_regs regs;
+        int cpu;
+
+        cpu = smp_processor_id();
+        if (saved_regs)
+                crash_setup_regs(&regs, saved_regs);
+        else
+                crash_get_current_regs(&regs);
+        crash_save_this_cpu(&regs, cpu);
+}
+
+#ifdef CONFIG_SMP
+static atomic_t waiting_for_crash_ipi;
+
+static int crash_nmi_callback(struct pt_regs *regs, int cpu)
+{
+        struct pt_regs fixed_regs;
+
+        /* Don't do anything if this handler is invoked on crashing cpu.
+         * Otherwise, system will completely hang. Crashing cpu can get
+         * an NMI if system was initially booted with nmi_watchdog parameter.
+         */
+        if (cpu == crashing_cpu)
+                return 1;
+        local_irq_disable();
+
+        if (!user_mode(regs)) {
+                crash_setup_regs(&fixed_regs, regs);
+                regs = &fixed_regs;
+        }
+        crash_save_this_cpu(regs, cpu);
+        disable_local_APIC();
+        atomic_dec(&waiting_for_crash_ipi);
+        /* Assume hlt works */
+        __asm__("hlt");
+        for(;;);
+
+        return 1;
+}
+
+/*
+ * By using the NMI code instead of a vector we just sneak thru the
+ * word generator coming out with just what we want.  AND it does
+ * not matter if clustered_apic_mode is set or not.
+ */
+static void smp_send_nmi_allbutself(void)
+{
+        send_IPI_allbutself(APIC_DM_NMI);
+}
+
+static void nmi_shootdown_cpus(void)
+{
+        unsigned long msecs;
+
+        atomic_set(&waiting_for_crash_ipi, num_online_cpus() - 1);
+        /* Would it be better to replace the trap vector here? */
+        set_nmi_callback(crash_nmi_callback);
+        /* Ensure the new callback function is set before sending
+         * out the NMI
+         */
+        wmb();
+
+        smp_send_nmi_allbutself();
+
+        msecs = 1000; /* Wait at most a second for the other cpus to stop */
+        while ((atomic_read(&waiting_for_crash_ipi) > 0) && msecs) {
+                mdelay(1);
+                msecs--;
+        }
+
+        /* Leave the nmi callback set */
+        disable_local_APIC();
+}
+#else
+static void nmi_shootdown_cpus(void)
+{
+        /* There are no cpus to shootdown */
+}
+#endif
+
+void machine_crash_shutdown(struct pt_regs *regs)
+{
+        /* This function is only called after the system
+         * has paniced or is otherwise in a critical state.
+         * The minimum amount of code to allow a kexec'd kernel
+         * to run successfully needs to happen here.
+         *
+         * In practice this means shooting down the other cpus in
+         * an SMP system.
+         */
+        /* The kernel is broken so disable interrupts */
+        local_irq_disable();
+
+        /* Make a note of crashing cpu. Will be used in NMI callback.*/
+        crashing_cpu = smp_processor_id();
+        nmi_shootdown_cpus();
+        lapic_shutdown();
+#if defined(CONFIG_X86_IO_APIC)
+        disable_IO_APIC();
+#endif
+        crash_save_self(regs);
+}