[IA64] IA64 Kexec/kdump

Changes and updates.

1. Remove fake rendz path and related code according to discuss with Khalid Aziz.
2. fc.i offset fix in relocate_kernel.S.
3. iospic shutdown code eoi and mask race fix from Fujitsu.
4. Warm boot hook in machine_kexec to SN SAL code from Jack Steiner.
5. Send slave to SAL slave loop patch from Jay Lan.
6. Kdump on non-recoverable MCA event patch from Jay Lan
7. Use CTL_UNNUMBERED in kdump_on_init sysctl.

Signed-off-by: Zou Nan hai <nanhai.zou@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>

1 files changed, 245 insertions, 0 deletions

diff --git a/arch/ia64/kernel/crash.c b/arch/ia64/kernel/crash.c
new file mode 100644
index 000000000000..0aabedf95dad
--- /dev/null
+++ b/arch/ia64/kernel/crash.c
@@ -0,0 +1,245 @@
+/*
+ * arch/ia64/kernel/crash.c
+ *
+ * Architecture specific (ia64) functions for kexec based crash dumps.
+ *
+ * Created by: Khalid Aziz <khalid.aziz@hp.com>
+ * Copyright (C) 2005 Hewlett-Packard Development Company, L.P.
+ * Copyright (C) 2005 Intel Corp        Zou Nan hai <nanhai.zou@intel.com>
+ *
+ */
+#include <linux/smp.h>
+#include <linux/delay.h>
+#include <linux/crash_dump.h>
+#include <linux/bootmem.h>
+#include <linux/kexec.h>
+#include <linux/elfcore.h>
+#include <linux/sysctl.h>
+#include <linux/init.h>
+
+#include <asm/kdebug.h>
+#include <asm/mca.h>
+#include <asm/uaccess.h>
+
+int kdump_status[NR_CPUS];
+atomic_t kdump_cpu_freezed;
+atomic_t kdump_in_progress;
+int kdump_on_init = 1;
+ssize_t
+copy_oldmem_page(unsigned long pfn, char *buf,
+                size_t csize, unsigned long offset, int userbuf)
+{
+        void  *vaddr;
+
+        if (!csize)
+                return 0;
+        vaddr = __va(pfn<<PAGE_SHIFT);
+        if (userbuf) {
+                if (copy_to_user(buf, (vaddr + offset), csize)) {
+                        return -EFAULT;
+                }
+        } else
+                memcpy(buf, (vaddr + offset), csize);
+        return csize;
+}
+
+static inline Elf64_Word
+*append_elf_note(Elf64_Word *buf, char *name, unsigned type, void *data,
+                size_t data_len)
+{
+        struct elf_note *note = (struct elf_note *)buf;
+        note->n_namesz = strlen(name) + 1;
+        note->n_descsz = data_len;
+        note->n_type   = type;
+        buf += (sizeof(*note) + 3)/4;
+        memcpy(buf, name, note->n_namesz);
+        buf += (note->n_namesz + 3)/4;
+        memcpy(buf, data, data_len);
+        buf += (data_len + 3)/4;
+        return buf;
+}
+
+static void
+final_note(void *buf)
+{
+        memset(buf, 0, sizeof(struct elf_note));
+}
+
+extern void ia64_dump_cpu_regs(void *);
+
+static DEFINE_PER_CPU(struct elf_prstatus, elf_prstatus);
+
+void
+crash_save_this_cpu()
+{
+        void *buf;
+        unsigned long cfm, sof, sol;
+
+        int cpu = smp_processor_id();
+        struct elf_prstatus *prstatus = &per_cpu(elf_prstatus, cpu);
+
+        elf_greg_t *dst = (elf_greg_t *)&(prstatus->pr_reg);
+        memset(prstatus, 0, sizeof(*prstatus));
+        prstatus->pr_pid = current->pid;
+
+        ia64_dump_cpu_regs(dst);
+        cfm = dst[43];
+        sol = (cfm >> 7) & 0x7f;
+        sof = cfm & 0x7f;
+        dst[46] = (unsigned long)ia64_rse_skip_regs((unsigned long *)dst[46],
+                        sof - sol);
+
+        buf = (u64 *) per_cpu_ptr(crash_notes, cpu);
+        if (!buf)
+                return;
+        buf = append_elf_note(buf, "CORE", NT_PRSTATUS, prstatus,
+                        sizeof(*prstatus));
+        final_note(buf);
+}
+
+static int
+kdump_wait_cpu_freeze(void)
+{
+        int cpu_num = num_online_cpus() - 1;
+        int timeout = 1000;
+        while(timeout-- > 0) {
+                if (atomic_read(&kdump_cpu_freezed) == cpu_num)
+                        return 0;
+                udelay(1000);
+        }
+        return 1;
+}
+
+void
+machine_crash_shutdown(struct pt_regs *pt)
+{
+        /* 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.
+         */
+        kexec_disable_iosapic();
+#ifdef CONFIG_SMP
+        kdump_smp_send_stop();
+        if (kdump_wait_cpu_freeze() && kdump_on_init)   {
+                //not all cpu response to IPI, send INIT to freeze them
+                kdump_smp_send_init();
+        }
+#endif
+}
+
+static void
+machine_kdump_on_init(void)
+{
+        local_irq_disable();
+        kexec_disable_iosapic();
+        machine_kexec(ia64_kimage);
+}
+
+void
+kdump_cpu_freeze(struct unw_frame_info *info, void *arg)
+{
+        int cpuid;
+        local_irq_disable();
+        cpuid = smp_processor_id();
+        crash_save_this_cpu();
+        current->thread.ksp = (__u64)info->sw - 16;
+        atomic_inc(&kdump_cpu_freezed);
+        kdump_status[cpuid] = 1;
+        mb();
+        if (cpuid == 0) {
+                for (;;)
+                        cpu_relax();
+        } else
+                ia64_jump_to_sal(&sal_boot_rendez_state[cpuid]);
+}
+
+static int
+kdump_init_notifier(struct notifier_block *self, unsigned long val, void *data)
+{
+        struct ia64_mca_notify_die *nd;
+        struct die_args *args = data;
+
+        if (!kdump_on_init)
+                return NOTIFY_DONE;
+
+        if (val != DIE_INIT_MONARCH_ENTER &&
+            val != DIE_INIT_SLAVE_ENTER &&
+            val != DIE_MCA_RENDZVOUS_LEAVE &&
+            val != DIE_MCA_MONARCH_LEAVE)
+                return NOTIFY_DONE;
+
+        nd = (struct ia64_mca_notify_die *)args->err;
+        /* Reason code 1 means machine check rendezous*/
+        if ((val == DIE_INIT_MONARCH_ENTER || DIE_INIT_SLAVE_ENTER) &&
+                 nd->sos->rv_rc == 1)
+                return NOTIFY_DONE;
+
+        switch (val) {
+                case DIE_INIT_MONARCH_ENTER:
+                        machine_kdump_on_init();
+                        break;
+                case DIE_INIT_SLAVE_ENTER:
+                        unw_init_running(kdump_cpu_freeze, NULL);
+                        break;
+                case DIE_MCA_RENDZVOUS_LEAVE:
+                        if (atomic_read(&kdump_in_progress))
+                                unw_init_running(kdump_cpu_freeze, NULL);
+                        break;
+                case DIE_MCA_MONARCH_LEAVE:
+                     /* die_register->signr indicate if MCA is recoverable */
+                        if (!args->signr)
+                                machine_kdump_on_init();
+                        break;
+        }
+        return NOTIFY_DONE;
+}
+
+#ifdef CONFIG_SYSCTL
+static ctl_table kdump_on_init_table[] = {
+        {
+                .ctl_name = CTL_UNNUMBERED,
+                .procname = "kdump_on_init",
+                .data = &kdump_on_init,
+                .maxlen = sizeof(int),
+                .mode = 0644,
+                .proc_handler = &proc_dointvec,
+        },
+        { .ctl_name = 0 }
+};
+
+static ctl_table sys_table[] = {
+        {
+          .ctl_name = CTL_KERN,
+          .procname = "kernel",
+          .mode = 0555,
+          .child = kdump_on_init_table,
+        },
+        { .ctl_name = 0 }
+};
+#endif
+
+static int
+machine_crash_setup(void)
+{
+        char *from = strstr(saved_command_line, "elfcorehdr=");
+        static struct notifier_block kdump_init_notifier_nb = {
+                .notifier_call = kdump_init_notifier,
+        };
+        int ret;
+        if (from)
+                elfcorehdr_addr = memparse(from+11, &from);
+        saved_max_pfn = (unsigned long)-1;
+        if((ret = register_die_notifier(&kdump_init_notifier_nb)) != 0)
+                return ret;
+#ifdef CONFIG_SYSCTL
+        register_sysctl_table(sys_table, 0);
+#endif
+        return 0;
+}
+
+__initcall(machine_crash_setup);
+