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/slab.h> 15 #include <linux/smp.h> 16 #include <linux/reboot.h> 17 #include <linux/kexec.h> 18 #include <linux/crash_dump.h> 19 20 #include <asm/kexec.h> 21 #include <asm/reg.h> 22 #include <asm/io.h> 23 #include <asm/prom.h> 24 #include <asm/machdep.h> 25 #include <asm/rtas.h> 26 #include <asm/cell-regs.h> 27 28 #include "ras.h" 29 30 31 static void dump_fir(int cpu) 32 { 33 struct cbe_pmd_regs __iomem *pregs = cbe_get_cpu_pmd_regs(cpu); 34 struct cbe_iic_regs __iomem *iregs = cbe_get_cpu_iic_regs(cpu); 35 36 if (pregs == NULL) 37 return; 38 39 /* Todo: do some nicer parsing of bits and based on them go down 40 * to other sub-units FIRs and not only IIC 41 */ 42 printk(KERN_ERR "Global Checkstop FIR : 0x%016llx\n", 43 in_be64(&pregs->checkstop_fir)); 44 printk(KERN_ERR "Global Recoverable FIR : 0x%016llx\n", 45 in_be64(&pregs->checkstop_fir)); 46 printk(KERN_ERR "Global MachineCheck FIR : 0x%016llx\n", 47 in_be64(&pregs->spec_att_mchk_fir)); 48 49 if (iregs == NULL) 50 return; 51 printk(KERN_ERR "IOC FIR : 0x%016llx\n", 52 in_be64(&iregs->ioc_fir)); 53 54 } 55 56 void cbe_system_error_exception(struct pt_regs *regs) 57 { 58 int cpu = smp_processor_id(); 59 60 printk(KERN_ERR "System Error Interrupt on CPU %d !\n", cpu); 61 dump_fir(cpu); 62 dump_stack(); 63 } 64 65 void cbe_maintenance_exception(struct pt_regs *regs) 66 { 67 int cpu = smp_processor_id(); 68 69 /* 70 * Nothing implemented for the maintenance interrupt at this point 71 */ 72 73 printk(KERN_ERR "Unhandled Maintenance interrupt on CPU %d !\n", cpu); 74 dump_stack(); 75 } 76 77 void cbe_thermal_exception(struct pt_regs *regs) 78 { 79 int cpu = smp_processor_id(); 80 81 /* 82 * Nothing implemented for the thermal interrupt at this point 83 */ 84 85 printk(KERN_ERR "Unhandled Thermal interrupt on CPU %d !\n", cpu); 86 dump_stack(); 87 } 88 89 static int cbe_machine_check_handler(struct pt_regs *regs) 90 { 91 int cpu = smp_processor_id(); 92 93 printk(KERN_ERR "Machine Check Interrupt on CPU %d !\n", cpu); 94 dump_fir(cpu); 95 96 /* No recovery from this code now, lets continue */ 97 return 0; 98 } 99 100 struct ptcal_area { 101 struct list_head list; 102 int nid; 103 int order; 104 struct page *pages; 105 }; 106 107 static LIST_HEAD(ptcal_list); 108 109 static int ptcal_start_tok, ptcal_stop_tok; 110 111 static int __init cbe_ptcal_enable_on_node(int nid, int order) 112 { 113 struct ptcal_area *area; 114 int ret = -ENOMEM; 115 unsigned long addr; 116 117 if (is_kdump_kernel()) 118 rtas_call(ptcal_stop_tok, 1, 1, NULL, nid); 119 120 area = kmalloc(sizeof(*area), GFP_KERNEL); 121 if (!area) 122 goto out_err; 123 124 area->nid = nid; 125 area->order = order; 126 area->pages = alloc_pages_exact_node(area->nid, GFP_KERNEL|GFP_THISNODE, 127 area->order); 128 129 if (!area->pages) { 130 printk(KERN_WARNING "%s: no page on node %d\n", 131 __func__, area->nid); 132 goto out_free_area; 133 } 134 135 /* 136 * We move the ptcal area to the middle of the allocated 137 * page, in order to avoid prefetches in memcpy and similar 138 * functions stepping on it. 139 */ 140 addr = __pa(page_address(area->pages)) + (PAGE_SIZE >> 1); 141 printk(KERN_DEBUG "%s: enabling PTCAL on node %d address=0x%016lx\n", 142 __func__, area->nid, addr); 143 144 ret = -EIO; 145 if (rtas_call(ptcal_start_tok, 3, 1, NULL, area->nid, 146 (unsigned int)(addr >> 32), 147 (unsigned int)(addr & 0xffffffff))) { 148 printk(KERN_ERR "%s: error enabling PTCAL on node %d!\n", 149 __func__, nid); 150 goto out_free_pages; 151 } 152 153 list_add(&area->list, &ptcal_list); 154 155 return 0; 156 157 out_free_pages: 158 __free_pages(area->pages, area->order); 159 out_free_area: 160 kfree(area); 161 out_err: 162 return ret; 163 } 164 165 static int __init cbe_ptcal_enable(void) 166 { 167 const u32 *size; 168 struct device_node *np; 169 int order, found_mic = 0; 170 171 np = of_find_node_by_path("/rtas"); 172 if (!np) 173 return -ENODEV; 174 175 size = of_get_property(np, "ibm,cbe-ptcal-size", NULL); 176 if (!size) { 177 of_node_put(np); 178 return -ENODEV; 179 } 180 181 pr_debug("%s: enabling PTCAL, size = 0x%x\n", __func__, *size); 182 order = get_order(*size); 183 of_node_put(np); 184 185 /* support for malta device trees, with be@/mic@ nodes */ 186 for_each_node_by_type(np, "mic-tm") { 187 cbe_ptcal_enable_on_node(of_node_to_nid(np), order); 188 found_mic = 1; 189 } 190 191 if (found_mic) 192 return 0; 193 194 /* support for older device tree - use cpu nodes */ 195 for_each_node_by_type(np, "cpu") { 196 const u32 *nid = of_get_property(np, "node-id", NULL); 197 if (!nid) { 198 printk(KERN_ERR "%s: node %s is missing node-id?\n", 199 __func__, np->full_name); 200 continue; 201 } 202 cbe_ptcal_enable_on_node(*nid, order); 203 found_mic = 1; 204 } 205 206 return found_mic ? 0 : -ENODEV; 207 } 208 209 static int cbe_ptcal_disable(void) 210 { 211 struct ptcal_area *area, *tmp; 212 int ret = 0; 213 214 pr_debug("%s: disabling PTCAL\n", __func__); 215 216 list_for_each_entry_safe(area, tmp, &ptcal_list, list) { 217 /* disable ptcal on this node */ 218 if (rtas_call(ptcal_stop_tok, 1, 1, NULL, area->nid)) { 219 printk(KERN_ERR "%s: error disabling PTCAL " 220 "on node %d!\n", __func__, 221 area->nid); 222 ret = -EIO; 223 continue; 224 } 225 226 /* ensure we can access the PTCAL area */ 227 memset(page_address(area->pages), 0, 228 1 << (area->order + PAGE_SHIFT)); 229 230 /* clean up */ 231 list_del(&area->list); 232 __free_pages(area->pages, area->order); 233 kfree(area); 234 } 235 236 return ret; 237 } 238 239 static int cbe_ptcal_notify_reboot(struct notifier_block *nb, 240 unsigned long code, void *data) 241 { 242 return cbe_ptcal_disable(); 243 } 244 245 static void cbe_ptcal_crash_shutdown(void) 246 { 247 cbe_ptcal_disable(); 248 } 249 250 static struct notifier_block cbe_ptcal_reboot_notifier = { 251 .notifier_call = cbe_ptcal_notify_reboot 252 }; 253 254 #ifdef CONFIG_PPC_IBM_CELL_RESETBUTTON 255 static int sysreset_hack; 256 257 static int __init cbe_sysreset_init(void) 258 { 259 struct cbe_pmd_regs __iomem *regs; 260 261 sysreset_hack = of_machine_is_compatible("IBM,CBPLUS-1.0"); 262 if (!sysreset_hack) 263 return 0; 264 265 regs = cbe_get_cpu_pmd_regs(0); 266 if (!regs) 267 return 0; 268 269 /* Enable JTAG system-reset hack */ 270 out_be32(®s->fir_mode_reg, 271 in_be32(®s->fir_mode_reg) | 272 CBE_PMD_FIR_MODE_M8); 273 274 return 0; 275 } 276 device_initcall(cbe_sysreset_init); 277 278 int cbe_sysreset_hack(void) 279 { 280 struct cbe_pmd_regs __iomem *regs; 281 282 /* 283 * The BMC can inject user triggered system reset exceptions, 284 * but cannot set the system reset reason in srr1, 285 * so check an extra register here. 286 */ 287 if (sysreset_hack && (smp_processor_id() == 0)) { 288 regs = cbe_get_cpu_pmd_regs(0); 289 if (!regs) 290 return 0; 291 if (in_be64(®s->ras_esc_0) & 0x0000ffff) { 292 out_be64(®s->ras_esc_0, 0); 293 return 0; 294 } 295 } 296 return 1; 297 } 298 #endif /* CONFIG_PPC_IBM_CELL_RESETBUTTON */ 299 300 int __init cbe_ptcal_init(void) 301 { 302 int ret; 303 ptcal_start_tok = rtas_token("ibm,cbe-start-ptcal"); 304 ptcal_stop_tok = rtas_token("ibm,cbe-stop-ptcal"); 305 306 if (ptcal_start_tok == RTAS_UNKNOWN_SERVICE 307 || ptcal_stop_tok == RTAS_UNKNOWN_SERVICE) 308 return -ENODEV; 309 310 ret = register_reboot_notifier(&cbe_ptcal_reboot_notifier); 311 if (ret) 312 goto out1; 313 314 ret = crash_shutdown_register(&cbe_ptcal_crash_shutdown); 315 if (ret) 316 goto out2; 317 318 return cbe_ptcal_enable(); 319 320 out2: 321 unregister_reboot_notifier(&cbe_ptcal_reboot_notifier); 322 out1: 323 printk(KERN_ERR "Can't disable PTCAL, so not enabling\n"); 324 return ret; 325 } 326 327 arch_initcall(cbe_ptcal_init); 328 329 void __init cbe_ras_init(void) 330 { 331 unsigned long hid0; 332 333 /* 334 * Enable System Error & thermal interrupts and wakeup conditions 335 */ 336 337 hid0 = mfspr(SPRN_HID0); 338 hid0 |= HID0_CBE_THERM_INT_EN | HID0_CBE_THERM_WAKEUP | 339 HID0_CBE_SYSERR_INT_EN | HID0_CBE_SYSERR_WAKEUP; 340 mtspr(SPRN_HID0, hid0); 341 mb(); 342 343 /* 344 * Install machine check handler. Leave setting of precise mode to 345 * what the firmware did for now 346 */ 347 ppc_md.machine_check_exception = cbe_machine_check_handler; 348 mb(); 349 350 /* 351 * For now, we assume that IOC_FIR is already set to forward some 352 * error conditions to the System Error handler. If that is not true 353 * then it will have to be fixed up here. 354 */ 355 } 356