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ras.c

/*
 * Copyright 2006-2008, IBM Corporation.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version
 * 2 of the License, or (at your option) any later version.
 */

#undef DEBUG

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/smp.h>
#include <linux/reboot.h>

#include <asm/reg.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/kexec.h>
#include <asm/machdep.h>
#include <asm/rtas.h>
#include <asm/cell-regs.h>

#include "ras.h"


static void dump_fir(int cpu)
{
      struct cbe_pmd_regs __iomem *pregs = cbe_get_cpu_pmd_regs(cpu);
      struct cbe_iic_regs __iomem *iregs = cbe_get_cpu_iic_regs(cpu);

      if (pregs == NULL)
            return;

      /* Todo: do some nicer parsing of bits and based on them go down
       * to other sub-units FIRs and not only IIC
       */
      printk(KERN_ERR "Global Checkstop FIR    : 0x%016lx\n",
             in_be64(&pregs->checkstop_fir));
      printk(KERN_ERR "Global Recoverable FIR  : 0x%016lx\n",
             in_be64(&pregs->checkstop_fir));
      printk(KERN_ERR "Global MachineCheck FIR : 0x%016lx\n",
             in_be64(&pregs->spec_att_mchk_fir));

      if (iregs == NULL)
            return;
      printk(KERN_ERR "IOC FIR                 : 0x%016lx\n",
             in_be64(&iregs->ioc_fir));

}

void cbe_system_error_exception(struct pt_regs *regs)
{
      int cpu = smp_processor_id();

      printk(KERN_ERR "System Error Interrupt on CPU %d !\n", cpu);
      dump_fir(cpu);
      dump_stack();
}

void cbe_maintenance_exception(struct pt_regs *regs)
{
      int cpu = smp_processor_id();

      /*
       * Nothing implemented for the maintenance interrupt at this point
       */

      printk(KERN_ERR "Unhandled Maintenance interrupt on CPU %d !\n", cpu);
      dump_stack();
}

void cbe_thermal_exception(struct pt_regs *regs)
{
      int cpu = smp_processor_id();

      /*
       * Nothing implemented for the thermal interrupt at this point
       */

      printk(KERN_ERR "Unhandled Thermal interrupt on CPU %d !\n", cpu);
      dump_stack();
}

static int cbe_machine_check_handler(struct pt_regs *regs)
{
      int cpu = smp_processor_id();

      printk(KERN_ERR "Machine Check Interrupt on CPU %d !\n", cpu);
      dump_fir(cpu);

      /* No recovery from this code now, lets continue */
      return 0;
}

struct ptcal_area {
      struct list_head list;
      int nid;
      int order;
      struct page *pages;
};

static LIST_HEAD(ptcal_list);

static int ptcal_start_tok, ptcal_stop_tok;

static int __init cbe_ptcal_enable_on_node(int nid, int order)
{
      struct ptcal_area *area;
      int ret = -ENOMEM;
      unsigned long addr;

#ifdef CONFIG_CRASH_DUMP
      rtas_call(ptcal_stop_tok, 1, 1, NULL, nid);
#endif

      area = kmalloc(sizeof(*area), GFP_KERNEL);
      if (!area)
            goto out_err;

      area->nid = nid;
      area->order = order;
      area->pages = alloc_pages_node(area->nid, GFP_KERNEL, area->order);

      if (!area->pages)
            goto out_free_area;

      addr = __pa(page_address(area->pages));

      ret = -EIO;
      if (rtas_call(ptcal_start_tok, 3, 1, NULL, area->nid,
                        (unsigned int)(addr >> 32),
                        (unsigned int)(addr & 0xffffffff))) {
            printk(KERN_ERR "%s: error enabling PTCAL on node %d!\n",
                        __func__, nid);
            goto out_free_pages;
      }

      list_add(&area->list, &ptcal_list);

      return 0;

out_free_pages:
      __free_pages(area->pages, area->order);
out_free_area:
      kfree(area);
out_err:
      return ret;
}

static int __init cbe_ptcal_enable(void)
{
      const u32 *size;
      struct device_node *np;
      int order, found_mic = 0;

      np = of_find_node_by_path("/rtas");
      if (!np)
            return -ENODEV;

      size = of_get_property(np, "ibm,cbe-ptcal-size", NULL);
      if (!size)
            return -ENODEV;

      pr_debug("%s: enabling PTCAL, size = 0x%x\n", __func__, *size);
      order = get_order(*size);
      of_node_put(np);

      /* support for malta device trees, with be@/mic@ nodes */
      for_each_node_by_type(np, "mic-tm") {
            cbe_ptcal_enable_on_node(of_node_to_nid(np), order);
            found_mic = 1;
      }

      if (found_mic)
            return 0;

      /* support for older device tree - use cpu nodes */
      for_each_node_by_type(np, "cpu") {
            const u32 *nid = of_get_property(np, "node-id", NULL);
            if (!nid) {
                  printk(KERN_ERR "%s: node %s is missing node-id?\n",
                              __func__, np->full_name);
                  continue;
            }
            cbe_ptcal_enable_on_node(*nid, order);
            found_mic = 1;
      }

      return found_mic ? 0 : -ENODEV;
}

static int cbe_ptcal_disable(void)
{
      struct ptcal_area *area, *tmp;
      int ret = 0;

      pr_debug("%s: disabling PTCAL\n", __func__);

      list_for_each_entry_safe(area, tmp, &ptcal_list, list) {
            /* disable ptcal on this node */
            if (rtas_call(ptcal_stop_tok, 1, 1, NULL, area->nid)) {
                  printk(KERN_ERR "%s: error disabling PTCAL "
                              "on node %d!\n", __func__,
                              area->nid);
                  ret = -EIO;
                  continue;
            }

            /* ensure we can access the PTCAL area */
            memset(page_address(area->pages), 0,
                        1 << (area->order + PAGE_SHIFT));

            /* clean up */
            list_del(&area->list);
            __free_pages(area->pages, area->order);
            kfree(area);
      }

      return ret;
}

static int cbe_ptcal_notify_reboot(struct notifier_block *nb,
            unsigned long code, void *data)
{
      return cbe_ptcal_disable();
}

static void cbe_ptcal_crash_shutdown(void)
{
      cbe_ptcal_disable();
}

static struct notifier_block cbe_ptcal_reboot_notifier = {
      .notifier_call = cbe_ptcal_notify_reboot
};

#ifdef CONFIG_PPC_IBM_CELL_RESETBUTTON
static int sysreset_hack;

static int __init cbe_sysreset_init(void)
{
      struct cbe_pmd_regs __iomem *regs;

      sysreset_hack = machine_is_compatible("IBM,CBPLUS-1.0");
      if (!sysreset_hack)
            return 0;

      regs = cbe_get_cpu_pmd_regs(0);
      if (!regs)
            return 0;

      /* Enable JTAG system-reset hack */
      out_be32(&regs->fir_mode_reg,
            in_be32(&regs->fir_mode_reg) |
            CBE_PMD_FIR_MODE_M8);

      return 0;
}
device_initcall(cbe_sysreset_init);

int cbe_sysreset_hack(void)
{
      struct cbe_pmd_regs __iomem *regs;

      /*
       * The BMC can inject user triggered system reset exceptions,
       * but cannot set the system reset reason in srr1,
       * so check an extra register here.
       */
      if (sysreset_hack && (smp_processor_id() == 0)) {
            regs = cbe_get_cpu_pmd_regs(0);
            if (!regs)
                  return 0;
            if (in_be64(&regs->ras_esc_0) & 0x0000ffff) {
                  out_be64(&regs->ras_esc_0, 0);
                  return 0;
            }
      }
      return 1;
}
#endif /* CONFIG_PPC_IBM_CELL_RESETBUTTON */

int __init cbe_ptcal_init(void)
{
      int ret;
      ptcal_start_tok = rtas_token("ibm,cbe-start-ptcal");
      ptcal_stop_tok = rtas_token("ibm,cbe-stop-ptcal");

      if (ptcal_start_tok == RTAS_UNKNOWN_SERVICE
                  || ptcal_stop_tok == RTAS_UNKNOWN_SERVICE)
            return -ENODEV;

      ret = register_reboot_notifier(&cbe_ptcal_reboot_notifier);
      if (ret)
            goto out1;

      ret = crash_shutdown_register(&cbe_ptcal_crash_shutdown);
      if (ret)
            goto out2;

      return cbe_ptcal_enable();

out2:
      unregister_reboot_notifier(&cbe_ptcal_reboot_notifier);
out1:
      printk(KERN_ERR "Can't disable PTCAL, so not enabling\n");
      return ret;
}

arch_initcall(cbe_ptcal_init);

void __init cbe_ras_init(void)
{
      unsigned long hid0;

      /*
       * Enable System Error & thermal interrupts and wakeup conditions
       */

      hid0 = mfspr(SPRN_HID0);
      hid0 |= HID0_CBE_THERM_INT_EN | HID0_CBE_THERM_WAKEUP |
            HID0_CBE_SYSERR_INT_EN | HID0_CBE_SYSERR_WAKEUP;
      mtspr(SPRN_HID0, hid0);
      mb();

      /*
       * Install machine check handler. Leave setting of precise mode to
       * what the firmware did for now
       */
      ppc_md.machine_check_exception = cbe_machine_check_handler;
      mb();

      /*
       * For now, we assume that IOC_FIR is already set to forward some
       * error conditions to the System Error handler. If that is not true
       * then it will have to be fixed up here.
       */
}

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