arch/powerpc/platforms/cell/ras.c

   1 /*
   2  * Copyright 2006-2008, IBM Corporation.
   3  *
   4  * This program is free software; you can redistribute it and/or
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; either version
   7  * 2 of the License, or (at your option) any later version.
   8  */
   9
  10 #undef DEBUG
  11
  12 #include <linux/types.h>
  13 #include <linux/kernel.h>
  14 #include <linux/smp.h>
  15 #include <linux/reboot.h>
  16 #include <linux/kexec.h>
  17 #include <linux/crash_dump.h>
  18
  19 #include <asm/reg.h>
  20 #include <asm/io.h>
  21 #include <asm/prom.h>
  22 #include <asm/machdep.h>
  23 #include <asm/rtas.h>
  24 #include <asm/cell-regs.h>
  25
  26 #include "ras.h"
  27
  28
  29 static void dump_fir(int cpu)
  30 {
  31         struct cbe_pmd_regs __iomem *pregs = cbe_get_cpu_pmd_regs(cpu);
  32         struct cbe_iic_regs __iomem *iregs = cbe_get_cpu_iic_regs(cpu);
  33
  34         if (pregs == NULL)
  35                 return;
  36
  37         /* Todo: do some nicer parsing of bits and based on them go down
  38          * to other sub-units FIRs and not only IIC
  39          */
  40         printk(KERN_ERR "Global Checkstop FIR    : 0x%016lx\n",
  41                in_be64(&pregs->checkstop_fir));
  42         printk(KERN_ERR "Global Recoverable FIR  : 0x%016lx\n",
  43                in_be64(&pregs->checkstop_fir));
  44         printk(KERN_ERR "Global MachineCheck FIR : 0x%016lx\n",
  45                in_be64(&pregs->spec_att_mchk_fir));
  46
  47         if (iregs == NULL)
  48                 return;
  49         printk(KERN_ERR "IOC FIR                 : 0x%016lx\n",
  50                in_be64(&iregs->ioc_fir));
  51
  52 }
  53
  54 void cbe_system_error_exception(struct pt_regs *regs)
  55 {
  56         int cpu = smp_processor_id();
  57
  58         printk(KERN_ERR "System Error Interrupt on CPU %d !\n", cpu);
  59         dump_fir(cpu);
  60         dump_stack();
  61 }
  62
  63 void cbe_maintenance_exception(struct pt_regs *regs)
  64 {
  65         int cpu = smp_processor_id();
  66
  67         /*
  68          * Nothing implemented for the maintenance interrupt at this point
  69          */
  70
  71         printk(KERN_ERR "Unhandled Maintenance interrupt on CPU %d !\n", cpu);
  72         dump_stack();
  73 }
  74
  75 void cbe_thermal_exception(struct pt_regs *regs)
  76 {
  77         int cpu = smp_processor_id();
  78
  79         /*
  80          * Nothing implemented for the thermal interrupt at this point
  81          */
  82
  83         printk(KERN_ERR "Unhandled Thermal interrupt on CPU %d !\n", cpu);
  84         dump_stack();
  85 }
  86
  87 static int cbe_machine_check_handler(struct pt_regs *regs)
  88 {
  89         int cpu = smp_processor_id();
  90
  91         printk(KERN_ERR "Machine Check Interrupt on CPU %d !\n", cpu);
  92         dump_fir(cpu);
  93
  94         /* No recovery from this code now, lets continue */
  95         return 0;
  96 }
  97
  98 struct ptcal_area {
  99         struct list_head list;
 100         int nid;
 101         int order;
 102         struct page *pages;
 103 };
 104
 105 static LIST_HEAD(ptcal_list);
 106
 107 static int ptcal_start_tok, ptcal_stop_tok;
 108
 109 static int __init cbe_ptcal_enable_on_node(int nid, int order)
 110 {
 111         struct ptcal_area *area;
 112         int ret = -ENOMEM;
 113         unsigned long addr;
 114
 115         if (is_kdump_kernel())
 116                 rtas_call(ptcal_stop_tok, 1, 1, NULL, nid);
 117
 118         area = kmalloc(sizeof(*area), GFP_KERNEL);
 119         if (!area)
 120                 goto out_err;
 121
 122         area->nid = nid;
 123         area->order = order;
 124         area->pages = alloc_pages_node(area->nid, GFP_KERNEL, area->order);
 125
 126         if (!area->pages)
 127                 goto out_free_area;
 128
 129         addr = __pa(page_address(area->pages));
 130
 131         ret = -EIO;
 132         if (rtas_call(ptcal_start_tok, 3, 1, NULL, area->nid,
 133                                 (unsigned int)(addr >> 32),
 134                                 (unsigned int)(addr & 0xffffffff))) {
 135                 printk(KERN_ERR "%s: error enabling PTCAL on node %d!\n",
 136                                 __func__, nid);
 137                 goto out_free_pages;
 138         }
 139
 140         list_add(&area->list, &ptcal_list);
 141
 142         return 0;
 143
 144 out_free_pages:
 145         __free_pages(area->pages, area->order);
 146 out_free_area:
 147         kfree(area);
 148 out_err:
 149         return ret;
 150 }
 151
 152 static int __init cbe_ptcal_enable(void)
 153 {
 154         const u32 *size;
 155         struct device_node *np;
 156         int order, found_mic = 0;
 157
 158         np = of_find_node_by_path("/rtas");
 159         if (!np)
 160                 return -ENODEV;
 161
 162         size = of_get_property(np, "ibm,cbe-ptcal-size", NULL);
 163         if (!size)
 164                 return -ENODEV;
 165
 166         pr_debug("%s: enabling PTCAL, size = 0x%x\n", __func__, *size);
 167         order = get_order(*size);
 168         of_node_put(np);
 169
 170         /* support for malta device trees, with be@/mic@ nodes */
 171         for_each_node_by_type(np, "mic-tm") {
 172                 cbe_ptcal_enable_on_node(of_node_to_nid(np), order);
 173                 found_mic = 1;
 174         }
 175
 176         if (found_mic)
 177                 return 0;
 178
 179         /* support for older device tree - use cpu nodes */
 180         for_each_node_by_type(np, "cpu") {
 181                 const u32 *nid = of_get_property(np, "node-id", NULL);
 182                 if (!nid) {
 183                         printk(KERN_ERR "%s: node %s is missing node-id?\n",
 184                                         __func__, np->full_name);
 185                         continue;
 186                 }
 187                 cbe_ptcal_enable_on_node(*nid, order);
 188                 found_mic = 1;
 189         }
 190
 191         return found_mic ? 0 : -ENODEV;
 192 }
 193
 194 static int cbe_ptcal_disable(void)
 195 {
 196         struct ptcal_area *area, *tmp;
 197         int ret = 0;
 198
 199         pr_debug("%s: disabling PTCAL\n", __func__);
 200
 201         list_for_each_entry_safe(area, tmp, &ptcal_list, list) {
 202                 /* disable ptcal on this node */
 203                 if (rtas_call(ptcal_stop_tok, 1, 1, NULL, area->nid)) {
 204                         printk(KERN_ERR "%s: error disabling PTCAL "
 205                                         "on node %d!\n", __func__,
 206                                         area->nid);
 207                         ret = -EIO;
 208                         continue;
 209                 }
 210
 211                 /* ensure we can access the PTCAL area */
 212                 memset(page_address(area->pages), 0,
 213                                 1 << (area->order + PAGE_SHIFT));
 214
 215                 /* clean up */
 216                 list_del(&area->list);
 217                 __free_pages(area->pages, area->order);
 218                 kfree(area);
 219         }
 220
 221         return ret;
 222 }
 223
 224 static int cbe_ptcal_notify_reboot(struct notifier_block *nb,
 225                 unsigned long code, void *data)
 226 {
 227         return cbe_ptcal_disable();
 228 }
 229
 230 static void cbe_ptcal_crash_shutdown(void)
 231 {
 232         cbe_ptcal_disable();
 233 }
 234
 235 static struct notifier_block cbe_ptcal_reboot_notifier = {
 236         .notifier_call = cbe_ptcal_notify_reboot
 237 };
 238
 239 #ifdef CONFIG_PPC_IBM_CELL_RESETBUTTON
 240 static int sysreset_hack;
 241
 242 static int __init cbe_sysreset_init(void)
 243 {
 244         struct cbe_pmd_regs __iomem *regs;
 245
 246         sysreset_hack = machine_is_compatible("IBM,CBPLUS-1.0");
 247         if (!sysreset_hack)
 248                 return 0;
 249
 250         regs = cbe_get_cpu_pmd_regs(0);
 251         if (!regs)
 252                 return 0;
 253
 254         /* Enable JTAG system-reset hack */
 255         out_be32(&regs->fir_mode_reg,
 256                 in_be32(&regs->fir_mode_reg) |
 257                 CBE_PMD_FIR_MODE_M8);
 258
 259         return 0;
 260 }
 261 device_initcall(cbe_sysreset_init);
 262
 263 int cbe_sysreset_hack(void)
 264 {
 265         struct cbe_pmd_regs __iomem *regs;
 266
 267         /*
 268          * The BMC can inject user triggered system reset exceptions,
 269          * but cannot set the system reset reason in srr1,
 270          * so check an extra register here.
 271          */
 272         if (sysreset_hack && (smp_processor_id() == 0)) {
 273                 regs = cbe_get_cpu_pmd_regs(0);
 274                 if (!regs)
 275                         return 0;
 276                 if (in_be64(&regs->ras_esc_0) & 0x0000ffff) {
 277                         out_be64(&regs->ras_esc_0, 0);
 278                         return 0;
 279                 }
 280         }
 281         return 1;
 282 }
 283 #endif /* CONFIG_PPC_IBM_CELL_RESETBUTTON */
 284
 285 int __init cbe_ptcal_init(void)
 286 {
 287         int ret;
 288         ptcal_start_tok = rtas_token("ibm,cbe-start-ptcal");
 289         ptcal_stop_tok = rtas_token("ibm,cbe-stop-ptcal");
 290
 291         if (ptcal_start_tok == RTAS_UNKNOWN_SERVICE
 292                         || ptcal_stop_tok == RTAS_UNKNOWN_SERVICE)
 293                 return -ENODEV;
 294
 295         ret = register_reboot_notifier(&cbe_ptcal_reboot_notifier);
 296         if (ret)
 297                 goto out1;
 298
 299         ret = crash_shutdown_register(&cbe_ptcal_crash_shutdown);
 300         if (ret)
 301                 goto out2;
 302
 303         return cbe_ptcal_enable();
 304
 305 out2:
 306         unregister_reboot_notifier(&cbe_ptcal_reboot_notifier);
 307 out1:
 308         printk(KERN_ERR "Can't disable PTCAL, so not enabling\n");
 309         return ret;
 310 }
 311
 312 arch_initcall(cbe_ptcal_init);
 313
 314 void __init cbe_ras_init(void)
 315 {
 316         unsigned long hid0;
 317
 318         /*
 319          * Enable System Error & thermal interrupts and wakeup conditions
 320          */
 321
 322         hid0 = mfspr(SPRN_HID0);
 323         hid0 |= HID0_CBE_THERM_INT_EN | HID0_CBE_THERM_WAKEUP |
 324                 HID0_CBE_SYSERR_INT_EN | HID0_CBE_SYSERR_WAKEUP;
 325         mtspr(SPRN_HID0, hid0);
 326         mb();
 327
 328         /*
 329          * Install machine check handler. Leave setting of precise mode to
 330          * what the firmware did for now
 331          */
 332         ppc_md.machine_check_exception = cbe_machine_check_handler;
 333         mb();
 334
 335         /*
 336          * For now, we assume that IOC_FIR is already set to forward some
 337          * error conditions to the System Error handler. If that is not true
 338          * then it will have to be fixed up here.
 339          */
 340 }