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 #include <linux/of.h>
16
17 #include <asm/kexec.h>
18 #include <asm/reg.h>
19 #include <asm/io.h>
20 #include <asm/machdep.h>
21 #include <asm/rtas.h>
22 #include <asm/cell-regs.h>
23
24 #include "ras.h"
25
26
dump_fir(int cpu)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
DEFINE_INTERRUPT_HANDLER(cbe_system_error_exception)52 DEFINE_INTERRUPT_HANDLER(cbe_system_error_exception)
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
DEFINE_INTERRUPT_HANDLER(cbe_maintenance_exception)61 DEFINE_INTERRUPT_HANDLER(cbe_maintenance_exception)
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
DEFINE_INTERRUPT_HANDLER(cbe_thermal_exception)73 DEFINE_INTERRUPT_HANDLER(cbe_thermal_exception)
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
cbe_machine_check_handler(struct pt_regs * regs)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
cbe_ptcal_enable_on_node(int nid,int order)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
cbe_ptcal_enable(void)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
cbe_ptcal_disable(void)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
cbe_ptcal_notify_reboot(struct notifier_block * nb,unsigned long code,void * data)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
cbe_ptcal_crash_shutdown(void)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
cbe_sysreset_init(void)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(®s->fir_mode_reg,
268 in_be32(®s->fir_mode_reg) |
269 CBE_PMD_FIR_MODE_M8);
270
271 return 0;
272 }
273 device_initcall(cbe_sysreset_init);
274
cbe_sysreset_hack(void)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(®s->ras_esc_0) & 0x0000ffff) {
289 out_be64(®s->ras_esc_0, 0);
290 return 0;
291 }
292 }
293 return 1;
294 }
295 #endif /* CONFIG_PPC_IBM_CELL_RESETBUTTON */
296
cbe_ptcal_init(void)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
cbe_ras_init(void)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 }
353