arch/powerpc/platforms/cell/ras.c

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This source file includes following definitions.
dump_fir
cbe_system_error_exception
cbe_maintenance_exception
cbe_thermal_exception
cbe_machine_check_handler
cbe_ptcal_enable_on_node
cbe_ptcal_enable
cbe_ptcal_disable
cbe_ptcal_notify_reboot
cbe_ptcal_crash_shutdown
cbe_sysreset_init
cbe_sysreset_hack
cbe_ptcal_init
cbe_ras_init
   1 // SPDX-License-Identifier: GPL-2.0-or-later
   2 /*
   3  * Copyright 2006-2008, IBM Corporation.
   4  */
   5 
   6 #undef DEBUG
   7 
   8 #include <linux/types.h>
   9 #include <linux/kernel.h>
  10 #include <linux/slab.h>
  11 #include <linux/smp.h>
  12 #include <linux/reboot.h>
  13 #include <linux/kexec.h>
  14 #include <linux/crash_dump.h>
  15 
  16 #include <asm/kexec.h>
  17 #include <asm/reg.h>
  18 #include <asm/io.h>
  19 #include <asm/prom.h>
  20 #include <asm/machdep.h>
  21 #include <asm/rtas.h>
  22 #include <asm/cell-regs.h>
  23 
  24 #include "ras.h"
  25 
  26 
  27 static void dump_fir(int cpu)
  28 {
  29         struct cbe_pmd_regs __iomem *pregs = cbe_get_cpu_pmd_regs(cpu);
  30         struct cbe_iic_regs __iomem *iregs = cbe_get_cpu_iic_regs(cpu);
  31 
  32         if (pregs == NULL)
  33                 return;
  34 
  35         /* Todo: do some nicer parsing of bits and based on them go down
  36          * to other sub-units FIRs and not only IIC
  37          */
  38         printk(KERN_ERR "Global Checkstop FIR    : 0x%016llx\n",
  39                in_be64(&pregs->checkstop_fir));
  40         printk(KERN_ERR "Global Recoverable FIR  : 0x%016llx\n",
  41                in_be64(&pregs->checkstop_fir));
  42         printk(KERN_ERR "Global MachineCheck FIR : 0x%016llx\n",
  43                in_be64(&pregs->spec_att_mchk_fir));
  44 
  45         if (iregs == NULL)
  46                 return;
  47         printk(KERN_ERR "IOC FIR                 : 0x%016llx\n",
  48                in_be64(&iregs->ioc_fir));
  49 
  50 }
  51 
  52 void cbe_system_error_exception(struct pt_regs *regs)
  53 {
  54         int cpu = smp_processor_id();
  55 
  56         printk(KERN_ERR "System Error Interrupt on CPU %d !\n", cpu);
  57         dump_fir(cpu);
  58         dump_stack();
  59 }
  60 
  61 void cbe_maintenance_exception(struct pt_regs *regs)
  62 {
  63         int cpu = smp_processor_id();
  64 
  65         /*
  66          * Nothing implemented for the maintenance interrupt at this point
  67          */
  68 
  69         printk(KERN_ERR "Unhandled Maintenance interrupt on CPU %d !\n", cpu);
  70         dump_stack();
  71 }
  72 
  73 void cbe_thermal_exception(struct pt_regs *regs)
  74 {
  75         int cpu = smp_processor_id();
  76 
  77         /*
  78          * Nothing implemented for the thermal interrupt at this point
  79          */
  80 
  81         printk(KERN_ERR "Unhandled Thermal interrupt on CPU %d !\n", cpu);
  82         dump_stack();
  83 }
  84 
  85 static int cbe_machine_check_handler(struct pt_regs *regs)
  86 {
  87         int cpu = smp_processor_id();
  88 
  89         printk(KERN_ERR "Machine Check Interrupt on CPU %d !\n", cpu);
  90         dump_fir(cpu);
  91 
  92         /* No recovery from this code now, lets continue */
  93         return 0;
  94 }
  95 
  96 struct ptcal_area {
  97         struct list_head list;
  98         int nid;
  99         int order;
 100         struct page *pages;
 101 };
 102 
 103 static LIST_HEAD(ptcal_list);
 104 
 105 static int ptcal_start_tok, ptcal_stop_tok;
 106 
 107 static int __init cbe_ptcal_enable_on_node(int nid, int order)
 108 {
 109         struct ptcal_area *area;
 110         int ret = -ENOMEM;
 111         unsigned long addr;
 112 
 113         if (is_kdump_kernel())
 114                 rtas_call(ptcal_stop_tok, 1, 1, NULL, nid);
 115 
 116         area = kmalloc(sizeof(*area), GFP_KERNEL);
 117         if (!area)
 118                 goto out_err;
 119 
 120         area->nid = nid;
 121         area->order = order;
 122         area->pages = __alloc_pages_node(area->nid,
 123                                                 GFP_KERNEL|__GFP_THISNODE,
 124                                                 area->order);
 125 
 126         if (!area->pages) {
 127                 printk(KERN_WARNING "%s: no page on node %d\n",
 128                         __func__, area->nid);
 129                 goto out_free_area;
 130         }
 131 
 132         /*
 133          * We move the ptcal area to the middle of the allocated
 134          * page, in order to avoid prefetches in memcpy and similar
 135          * functions stepping on it.
 136          */
 137         addr = __pa(page_address(area->pages)) + (PAGE_SIZE >> 1);
 138         printk(KERN_DEBUG "%s: enabling PTCAL on node %d address=0x%016lx\n",
 139                         __func__, area->nid, addr);
 140 
 141         ret = -EIO;
 142         if (rtas_call(ptcal_start_tok, 3, 1, NULL, area->nid,
 143                                 (unsigned int)(addr >> 32),
 144                                 (unsigned int)(addr & 0xffffffff))) {
 145                 printk(KERN_ERR "%s: error enabling PTCAL on node %d!\n",
 146                                 __func__, nid);
 147                 goto out_free_pages;
 148         }
 149 
 150         list_add(&area->list, &ptcal_list);
 151 
 152         return 0;
 153 
 154 out_free_pages:
 155         __free_pages(area->pages, area->order);
 156 out_free_area:
 157         kfree(area);
 158 out_err:
 159         return ret;
 160 }
 161 
 162 static int __init cbe_ptcal_enable(void)
 163 {
 164         const u32 *size;
 165         struct device_node *np;
 166         int order, found_mic = 0;
 167 
 168         np = of_find_node_by_path("/rtas");
 169         if (!np)
 170                 return -ENODEV;
 171 
 172         size = of_get_property(np, "ibm,cbe-ptcal-size", NULL);
 173         if (!size) {
 174                 of_node_put(np);
 175                 return -ENODEV;
 176         }
 177 
 178         pr_debug("%s: enabling PTCAL, size = 0x%x\n", __func__, *size);
 179         order = get_order(*size);
 180         of_node_put(np);
 181 
 182         /* support for malta device trees, with be@/mic@ nodes */
 183         for_each_node_by_type(np, "mic-tm") {
 184                 cbe_ptcal_enable_on_node(of_node_to_nid(np), order);
 185                 found_mic = 1;
 186         }
 187 
 188         if (found_mic)
 189                 return 0;
 190 
 191         /* support for older device tree - use cpu nodes */
 192         for_each_node_by_type(np, "cpu") {
 193                 const u32 *nid = of_get_property(np, "node-id", NULL);
 194                 if (!nid) {
 195                         printk(KERN_ERR "%s: node %pOF is missing node-id?\n",
 196                                         __func__, np);
 197                         continue;
 198                 }
 199                 cbe_ptcal_enable_on_node(*nid, order);
 200                 found_mic = 1;
 201         }
 202 
 203         return found_mic ? 0 : -ENODEV;
 204 }
 205 
 206 static int cbe_ptcal_disable(void)
 207 {
 208         struct ptcal_area *area, *tmp;
 209         int ret = 0;
 210 
 211         pr_debug("%s: disabling PTCAL\n", __func__);
 212 
 213         list_for_each_entry_safe(area, tmp, &ptcal_list, list) {
 214                 /* disable ptcal on this node */
 215                 if (rtas_call(ptcal_stop_tok, 1, 1, NULL, area->nid)) {
 216                         printk(KERN_ERR "%s: error disabling PTCAL "
 217                                         "on node %d!\n", __func__,
 218                                         area->nid);
 219                         ret = -EIO;
 220                         continue;
 221                 }
 222 
 223                 /* ensure we can access the PTCAL area */
 224                 memset(page_address(area->pages), 0,
 225                                 1 << (area->order + PAGE_SHIFT));
 226 
 227                 /* clean up */
 228                 list_del(&area->list);
 229                 __free_pages(area->pages, area->order);
 230                 kfree(area);
 231         }
 232 
 233         return ret;
 234 }
 235 
 236 static int cbe_ptcal_notify_reboot(struct notifier_block *nb,
 237                 unsigned long code, void *data)
 238 {
 239         return cbe_ptcal_disable();
 240 }
 241 
 242 static void cbe_ptcal_crash_shutdown(void)
 243 {
 244         cbe_ptcal_disable();
 245 }
 246 
 247 static struct notifier_block cbe_ptcal_reboot_notifier = {
 248         .notifier_call = cbe_ptcal_notify_reboot
 249 };
 250 
 251 #ifdef CONFIG_PPC_IBM_CELL_RESETBUTTON
 252 static int sysreset_hack;
 253 
 254 static int __init cbe_sysreset_init(void)
 255 {
 256         struct cbe_pmd_regs __iomem *regs;
 257 
 258         sysreset_hack = of_machine_is_compatible("IBM,CBPLUS-1.0");
 259         if (!sysreset_hack)
 260                 return 0;
 261 
 262         regs = cbe_get_cpu_pmd_regs(0);
 263         if (!regs)
 264                 return 0;
 265 
 266         /* Enable JTAG system-reset hack */
 267         out_be32(&regs->fir_mode_reg,
 268                 in_be32(&regs->fir_mode_reg) |
 269                 CBE_PMD_FIR_MODE_M8);
 270 
 271         return 0;
 272 }
 273 device_initcall(cbe_sysreset_init);
 274 
 275 int cbe_sysreset_hack(void)
 276 {
 277         struct cbe_pmd_regs __iomem *regs;
 278 
 279         /*
 280          * The BMC can inject user triggered system reset exceptions,
 281          * but cannot set the system reset reason in srr1,
 282          * so check an extra register here.
 283          */
 284         if (sysreset_hack && (smp_processor_id() == 0)) {
 285                 regs = cbe_get_cpu_pmd_regs(0);
 286                 if (!regs)
 287                         return 0;
 288                 if (in_be64(&regs->ras_esc_0) & 0x0000ffff) {
 289                         out_be64(&regs->ras_esc_0, 0);
 290                         return 0;
 291                 }
 292         }
 293         return 1;
 294 }
 295 #endif /* CONFIG_PPC_IBM_CELL_RESETBUTTON */
 296 
 297 static int __init cbe_ptcal_init(void)
 298 {
 299         int ret;
 300         ptcal_start_tok = rtas_token("ibm,cbe-start-ptcal");
 301         ptcal_stop_tok = rtas_token("ibm,cbe-stop-ptcal");
 302 
 303         if (ptcal_start_tok == RTAS_UNKNOWN_SERVICE
 304                         || ptcal_stop_tok == RTAS_UNKNOWN_SERVICE)
 305                 return -ENODEV;
 306 
 307         ret = register_reboot_notifier(&cbe_ptcal_reboot_notifier);
 308         if (ret)
 309                 goto out1;
 310 
 311         ret = crash_shutdown_register(&cbe_ptcal_crash_shutdown);
 312         if (ret)
 313                 goto out2;
 314 
 315         return cbe_ptcal_enable();
 316 
 317 out2:
 318         unregister_reboot_notifier(&cbe_ptcal_reboot_notifier);
 319 out1:
 320         printk(KERN_ERR "Can't disable PTCAL, so not enabling\n");
 321         return ret;
 322 }
 323 
 324 arch_initcall(cbe_ptcal_init);
 325 
 326 void __init cbe_ras_init(void)
 327 {
 328         unsigned long hid0;
 329 
 330         /*
 331          * Enable System Error & thermal interrupts and wakeup conditions
 332          */
 333 
 334         hid0 = mfspr(SPRN_HID0);
 335         hid0 |= HID0_CBE_THERM_INT_EN | HID0_CBE_THERM_WAKEUP |
 336                 HID0_CBE_SYSERR_INT_EN | HID0_CBE_SYSERR_WAKEUP;
 337         mtspr(SPRN_HID0, hid0);
 338         mb();
 339 
 340         /*
 341          * Install machine check handler. Leave setting of precise mode to
 342          * what the firmware did for now
 343          */
 344         ppc_md.machine_check_exception = cbe_machine_check_handler;
 345         mb();
 346 
 347         /*
 348          * For now, we assume that IOC_FIR is already set to forward some
 349          * error conditions to the System Error handler. If that is not true
 350          * then it will have to be fixed up here.
 351          */
 352 }
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root/arch/powerpc/platforms/cell/ras.c

DEFINITIONS
