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bdb226ba ME |
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 | |
acf7d768 | 11 | |
acf7d768 BH |
12 | #include <linux/types.h> |
13 | #include <linux/kernel.h> | |
5a0e3ad6 | 14 | #include <linux/slab.h> |
acf7d768 | 15 | #include <linux/smp.h> |
150f7e3c | 16 | #include <linux/reboot.h> |
62a8bd6c MM |
17 | #include <linux/kexec.h> |
18 | #include <linux/crash_dump.h> | |
acf7d768 | 19 | |
9c8b4aff | 20 | #include <asm/kexec.h> |
acf7d768 BH |
21 | #include <asm/reg.h> |
22 | #include <asm/io.h> | |
23 | #include <asm/prom.h> | |
24 | #include <asm/machdep.h> | |
150f7e3c | 25 | #include <asm/rtas.h> |
eef686a0 | 26 | #include <asm/cell-regs.h> |
acf7d768 BH |
27 | |
28 | #include "ras.h" | |
acf7d768 BH |
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 | */ | |
fe333321 | 42 | printk(KERN_ERR "Global Checkstop FIR : 0x%016llx\n", |
acf7d768 | 43 | in_be64(&pregs->checkstop_fir)); |
fe333321 | 44 | printk(KERN_ERR "Global Recoverable FIR : 0x%016llx\n", |
acf7d768 | 45 | in_be64(&pregs->checkstop_fir)); |
fe333321 | 46 | printk(KERN_ERR "Global MachineCheck FIR : 0x%016llx\n", |
acf7d768 BH |
47 | in_be64(&pregs->spec_att_mchk_fir)); |
48 | ||
49 | if (iregs == NULL) | |
50 | return; | |
fe333321 | 51 | printk(KERN_ERR "IOC FIR : 0x%016llx\n", |
acf7d768 BH |
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 | ||
150f7e3c JK |
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 | ||
62a8bd6c | 117 | if (is_kdump_kernel()) |
54622f10 | 118 | rtas_call(ptcal_stop_tok, 1, 1, NULL, nid); |
150f7e3c JK |
119 | |
120 | area = kmalloc(sizeof(*area), GFP_KERNEL); | |
121 | if (!area) | |
122 | goto out_err; | |
123 | ||
124 | area->nid = nid; | |
125 | area->order = order; | |
96db800f | 126 | area->pages = __alloc_pages_node(area->nid, |
e97ca8e5 | 127 | GFP_KERNEL|__GFP_THISNODE, |
6484eb3e | 128 | area->order); |
150f7e3c | 129 | |
37cd8ed9 GS |
130 | if (!area->pages) { |
131 | printk(KERN_WARNING "%s: no page on node %d\n", | |
132 | __func__, area->nid); | |
150f7e3c | 133 | goto out_free_area; |
37cd8ed9 | 134 | } |
150f7e3c | 135 | |
37cd8ed9 GS |
136 | /* |
137 | * We move the ptcal area to the middle of the allocated | |
138 | * page, in order to avoid prefetches in memcpy and similar | |
139 | * functions stepping on it. | |
140 | */ | |
141 | addr = __pa(page_address(area->pages)) + (PAGE_SIZE >> 1); | |
142 | printk(KERN_DEBUG "%s: enabling PTCAL on node %d address=0x%016lx\n", | |
143 | __func__, area->nid, addr); | |
150f7e3c JK |
144 | |
145 | ret = -EIO; | |
146 | if (rtas_call(ptcal_start_tok, 3, 1, NULL, area->nid, | |
147 | (unsigned int)(addr >> 32), | |
148 | (unsigned int)(addr & 0xffffffff))) { | |
149 | printk(KERN_ERR "%s: error enabling PTCAL on node %d!\n", | |
e48b1b45 | 150 | __func__, nid); |
150f7e3c JK |
151 | goto out_free_pages; |
152 | } | |
153 | ||
154 | list_add(&area->list, &ptcal_list); | |
155 | ||
156 | return 0; | |
157 | ||
158 | out_free_pages: | |
159 | __free_pages(area->pages, area->order); | |
160 | out_free_area: | |
161 | kfree(area); | |
162 | out_err: | |
163 | return ret; | |
164 | } | |
165 | ||
166 | static int __init cbe_ptcal_enable(void) | |
167 | { | |
168 | const u32 *size; | |
169 | struct device_node *np; | |
170 | int order, found_mic = 0; | |
171 | ||
172 | np = of_find_node_by_path("/rtas"); | |
173 | if (!np) | |
174 | return -ENODEV; | |
175 | ||
12d371a6 | 176 | size = of_get_property(np, "ibm,cbe-ptcal-size", NULL); |
182f30e4 JL |
177 | if (!size) { |
178 | of_node_put(np); | |
150f7e3c | 179 | return -ENODEV; |
182f30e4 | 180 | } |
150f7e3c | 181 | |
e48b1b45 | 182 | pr_debug("%s: enabling PTCAL, size = 0x%x\n", __func__, *size); |
150f7e3c JK |
183 | order = get_order(*size); |
184 | of_node_put(np); | |
185 | ||
186 | /* support for malta device trees, with be@/mic@ nodes */ | |
187 | for_each_node_by_type(np, "mic-tm") { | |
188 | cbe_ptcal_enable_on_node(of_node_to_nid(np), order); | |
189 | found_mic = 1; | |
190 | } | |
191 | ||
192 | if (found_mic) | |
193 | return 0; | |
194 | ||
195 | /* support for older device tree - use cpu nodes */ | |
196 | for_each_node_by_type(np, "cpu") { | |
12d371a6 | 197 | const u32 *nid = of_get_property(np, "node-id", NULL); |
150f7e3c JK |
198 | if (!nid) { |
199 | printk(KERN_ERR "%s: node %s is missing node-id?\n", | |
e48b1b45 | 200 | __func__, np->full_name); |
150f7e3c JK |
201 | continue; |
202 | } | |
203 | cbe_ptcal_enable_on_node(*nid, order); | |
204 | found_mic = 1; | |
205 | } | |
206 | ||
207 | return found_mic ? 0 : -ENODEV; | |
208 | } | |
209 | ||
210 | static int cbe_ptcal_disable(void) | |
211 | { | |
212 | struct ptcal_area *area, *tmp; | |
213 | int ret = 0; | |
214 | ||
e48b1b45 | 215 | pr_debug("%s: disabling PTCAL\n", __func__); |
150f7e3c JK |
216 | |
217 | list_for_each_entry_safe(area, tmp, &ptcal_list, list) { | |
218 | /* disable ptcal on this node */ | |
219 | if (rtas_call(ptcal_stop_tok, 1, 1, NULL, area->nid)) { | |
220 | printk(KERN_ERR "%s: error disabling PTCAL " | |
e48b1b45 | 221 | "on node %d!\n", __func__, |
150f7e3c JK |
222 | area->nid); |
223 | ret = -EIO; | |
224 | continue; | |
225 | } | |
226 | ||
227 | /* ensure we can access the PTCAL area */ | |
228 | memset(page_address(area->pages), 0, | |
229 | 1 << (area->order + PAGE_SHIFT)); | |
230 | ||
231 | /* clean up */ | |
232 | list_del(&area->list); | |
233 | __free_pages(area->pages, area->order); | |
234 | kfree(area); | |
235 | } | |
236 | ||
237 | return ret; | |
238 | } | |
239 | ||
240 | static int cbe_ptcal_notify_reboot(struct notifier_block *nb, | |
241 | unsigned long code, void *data) | |
242 | { | |
243 | return cbe_ptcal_disable(); | |
244 | } | |
245 | ||
5acb0807 AB |
246 | static void cbe_ptcal_crash_shutdown(void) |
247 | { | |
248 | cbe_ptcal_disable(); | |
249 | } | |
250 | ||
150f7e3c JK |
251 | static struct notifier_block cbe_ptcal_reboot_notifier = { |
252 | .notifier_call = cbe_ptcal_notify_reboot | |
253 | }; | |
254 | ||
70694a8b CK |
255 | #ifdef CONFIG_PPC_IBM_CELL_RESETBUTTON |
256 | static int sysreset_hack; | |
257 | ||
258 | static int __init cbe_sysreset_init(void) | |
259 | { | |
260 | struct cbe_pmd_regs __iomem *regs; | |
261 | ||
71a157e8 | 262 | sysreset_hack = of_machine_is_compatible("IBM,CBPLUS-1.0"); |
70694a8b CK |
263 | if (!sysreset_hack) |
264 | return 0; | |
265 | ||
266 | regs = cbe_get_cpu_pmd_regs(0); | |
267 | if (!regs) | |
268 | return 0; | |
269 | ||
270 | /* Enable JTAG system-reset hack */ | |
271 | out_be32(®s->fir_mode_reg, | |
272 | in_be32(®s->fir_mode_reg) | | |
273 | CBE_PMD_FIR_MODE_M8); | |
274 | ||
275 | return 0; | |
276 | } | |
277 | device_initcall(cbe_sysreset_init); | |
278 | ||
279 | int cbe_sysreset_hack(void) | |
280 | { | |
281 | struct cbe_pmd_regs __iomem *regs; | |
282 | ||
283 | /* | |
284 | * The BMC can inject user triggered system reset exceptions, | |
285 | * but cannot set the system reset reason in srr1, | |
286 | * so check an extra register here. | |
287 | */ | |
288 | if (sysreset_hack && (smp_processor_id() == 0)) { | |
289 | regs = cbe_get_cpu_pmd_regs(0); | |
290 | if (!regs) | |
291 | return 0; | |
292 | if (in_be64(®s->ras_esc_0) & 0x0000ffff) { | |
293 | out_be64(®s->ras_esc_0, 0); | |
294 | return 0; | |
295 | } | |
296 | } | |
297 | return 1; | |
298 | } | |
299 | #endif /* CONFIG_PPC_IBM_CELL_RESETBUTTON */ | |
300 | ||
150f7e3c JK |
301 | int __init cbe_ptcal_init(void) |
302 | { | |
303 | int ret; | |
304 | ptcal_start_tok = rtas_token("ibm,cbe-start-ptcal"); | |
305 | ptcal_stop_tok = rtas_token("ibm,cbe-stop-ptcal"); | |
306 | ||
307 | if (ptcal_start_tok == RTAS_UNKNOWN_SERVICE | |
308 | || ptcal_stop_tok == RTAS_UNKNOWN_SERVICE) | |
309 | return -ENODEV; | |
310 | ||
311 | ret = register_reboot_notifier(&cbe_ptcal_reboot_notifier); | |
5acb0807 AB |
312 | if (ret) |
313 | goto out1; | |
314 | ||
315 | ret = crash_shutdown_register(&cbe_ptcal_crash_shutdown); | |
316 | if (ret) | |
317 | goto out2; | |
150f7e3c JK |
318 | |
319 | return cbe_ptcal_enable(); | |
5acb0807 AB |
320 | |
321 | out2: | |
322 | unregister_reboot_notifier(&cbe_ptcal_reboot_notifier); | |
323 | out1: | |
324 | printk(KERN_ERR "Can't disable PTCAL, so not enabling\n"); | |
325 | return ret; | |
150f7e3c JK |
326 | } |
327 | ||
328 | arch_initcall(cbe_ptcal_init); | |
329 | ||
acf7d768 BH |
330 | void __init cbe_ras_init(void) |
331 | { | |
332 | unsigned long hid0; | |
333 | ||
334 | /* | |
335 | * Enable System Error & thermal interrupts and wakeup conditions | |
336 | */ | |
337 | ||
338 | hid0 = mfspr(SPRN_HID0); | |
339 | hid0 |= HID0_CBE_THERM_INT_EN | HID0_CBE_THERM_WAKEUP | | |
340 | HID0_CBE_SYSERR_INT_EN | HID0_CBE_SYSERR_WAKEUP; | |
341 | mtspr(SPRN_HID0, hid0); | |
342 | mb(); | |
343 | ||
344 | /* | |
345 | * Install machine check handler. Leave setting of precise mode to | |
346 | * what the firmware did for now | |
347 | */ | |
348 | ppc_md.machine_check_exception = cbe_machine_check_handler; | |
349 | mb(); | |
350 | ||
351 | /* | |
352 | * For now, we assume that IOC_FIR is already set to forward some | |
353 | * error conditions to the System Error handler. If that is not true | |
354 | * then it will have to be fixed up here. | |
355 | */ | |
356 | } |