summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/platforms/cell/ras.c
blob: 3961a085b432b4046bd2525c2e850c708da49ae4 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
#define DEBUG

#include <linux/types.h>
#include <linux/kernel.h>
#include <linux/smp.h>
#include <linux/reboot.h>

#include <asm/reg.h>
#include <asm/io.h>
#include <asm/prom.h>
#include <asm/machdep.h>
#include <asm/rtas.h>

#include "ras.h"
#include "cbe_regs.h"


static void dump_fir(int cpu)
{
	struct cbe_pmd_regs __iomem *pregs = cbe_get_cpu_pmd_regs(cpu);
	struct cbe_iic_regs __iomem *iregs = cbe_get_cpu_iic_regs(cpu);

	if (pregs == NULL)
		return;

	/* Todo: do some nicer parsing of bits and based on them go down
	 * to other sub-units FIRs and not only IIC
	 */
	printk(KERN_ERR "Global Checkstop FIR    : 0x%016lx\n",
	       in_be64(&pregs->checkstop_fir));
	printk(KERN_ERR "Global Recoverable FIR  : 0x%016lx\n",
	       in_be64(&pregs->checkstop_fir));
	printk(KERN_ERR "Global MachineCheck FIR : 0x%016lx\n",
	       in_be64(&pregs->spec_att_mchk_fir));

	if (iregs == NULL)
		return;
	printk(KERN_ERR "IOC FIR                 : 0x%016lx\n",
	       in_be64(&iregs->ioc_fir));

}

void cbe_system_error_exception(struct pt_regs *regs)
{
	int cpu = smp_processor_id();

	printk(KERN_ERR "System Error Interrupt on CPU %d !\n", cpu);
	dump_fir(cpu);
	dump_stack();
}

void cbe_maintenance_exception(struct pt_regs *regs)
{
	int cpu = smp_processor_id();

	/*
	 * Nothing implemented for the maintenance interrupt at this point
	 */

	printk(KERN_ERR "Unhandled Maintenance interrupt on CPU %d !\n", cpu);
	dump_stack();
}

void cbe_thermal_exception(struct pt_regs *regs)
{
	int cpu = smp_processor_id();

	/*
	 * Nothing implemented for the thermal interrupt at this point
	 */

	printk(KERN_ERR "Unhandled Thermal interrupt on CPU %d !\n", cpu);
	dump_stack();
}

static int cbe_machine_check_handler(struct pt_regs *regs)
{
	int cpu = smp_processor_id();

	printk(KERN_ERR "Machine Check Interrupt on CPU %d !\n", cpu);
	dump_fir(cpu);

	/* No recovery from this code now, lets continue */
	return 0;
}

struct ptcal_area {
	struct list_head list;
	int nid;
	int order;
	struct page *pages;
};

static LIST_HEAD(ptcal_list);

static int ptcal_start_tok, ptcal_stop_tok;

static int __init cbe_ptcal_enable_on_node(int nid, int order)
{
	struct ptcal_area *area;
	int ret = -ENOMEM;
	unsigned long addr;

#ifdef CONFIG_CRASH_DUMP
	rtas_call(ptcal_stop_tok, 1, 1, NULL, nid);
#endif

	area = kmalloc(sizeof(*area), GFP_KERNEL);
	if (!area)
		goto out_err;

	area->nid = nid;
	area->order = order;
	area->pages = alloc_pages_node(area->nid, GFP_KERNEL, area->order);

	if (!area->pages)
		goto out_free_area;

	addr = __pa(page_address(area->pages));

	ret = -EIO;
	if (rtas_call(ptcal_start_tok, 3, 1, NULL, area->nid,
				(unsigned int)(addr >> 32),
				(unsigned int)(addr & 0xffffffff))) {
		printk(KERN_ERR "%s: error enabling PTCAL on node %d!\n",
				__FUNCTION__, nid);
		goto out_free_pages;
	}

	list_add(&area->list, &ptcal_list);

	return 0;

out_free_pages:
	__free_pages(area->pages, area->order);
out_free_area:
	kfree(area);
out_err:
	return ret;
}

static int __init cbe_ptcal_enable(void)
{
	const u32 *size;
	struct device_node *np;
	int order, found_mic = 0;

	np = of_find_node_by_path("/rtas");
	if (!np)
		return -ENODEV;

	size = of_get_property(np, "ibm,cbe-ptcal-size", NULL);
	if (!size)
		return -ENODEV;

	pr_debug("%s: enabling PTCAL, size = 0x%x\n", __FUNCTION__, *size);
	order = get_order(*size);
	of_node_put(np);

	/* support for malta device trees, with be@/mic@ nodes */
	for_each_node_by_type(np, "mic-tm") {
		cbe_ptcal_enable_on_node(of_node_to_nid(np), order);
		found_mic = 1;
	}

	if (found_mic)
		return 0;

	/* support for older device tree - use cpu nodes */
	for_each_node_by_type(np, "cpu") {
		const u32 *nid = of_get_property(np, "node-id", NULL);
		if (!nid) {
			printk(KERN_ERR "%s: node %s is missing node-id?\n",
					__FUNCTION__, np->full_name);
			continue;
		}
		cbe_ptcal_enable_on_node(*nid, order);
		found_mic = 1;
	}

	return found_mic ? 0 : -ENODEV;
}

static int cbe_ptcal_disable(void)
{
	struct ptcal_area *area, *tmp;
	int ret = 0;

	pr_debug("%s: disabling PTCAL\n", __FUNCTION__);

	list_for_each_entry_safe(area, tmp, &ptcal_list, list) {
		/* disable ptcal on this node */
		if (rtas_call(ptcal_stop_tok, 1, 1, NULL, area->nid)) {
			printk(KERN_ERR "%s: error disabling PTCAL "
					"on node %d!\n", __FUNCTION__,
					area->nid);
			ret = -EIO;
			continue;
		}

		/* ensure we can access the PTCAL area */
		memset(page_address(area->pages), 0,
				1 << (area->order + PAGE_SHIFT));

		/* clean up */
		list_del(&area->list);
		__free_pages(area->pages, area->order);
		kfree(area);
	}

	return ret;
}

static int cbe_ptcal_notify_reboot(struct notifier_block *nb,
		unsigned long code, void *data)
{
	return cbe_ptcal_disable();
}

static struct notifier_block cbe_ptcal_reboot_notifier = {
	.notifier_call = cbe_ptcal_notify_reboot
};

int __init cbe_ptcal_init(void)
{
	int ret;
	ptcal_start_tok = rtas_token("ibm,cbe-start-ptcal");
	ptcal_stop_tok = rtas_token("ibm,cbe-stop-ptcal");

	if (ptcal_start_tok == RTAS_UNKNOWN_SERVICE
			|| ptcal_stop_tok == RTAS_UNKNOWN_SERVICE)
		return -ENODEV;

	ret = register_reboot_notifier(&cbe_ptcal_reboot_notifier);
	if (ret) {
		printk(KERN_ERR "Can't disable PTCAL, so not enabling\n");
		return ret;
	}

	return cbe_ptcal_enable();
}

arch_initcall(cbe_ptcal_init);

void __init cbe_ras_init(void)
{
	unsigned long hid0;

	/*
	 * Enable System Error & thermal interrupts and wakeup conditions
	 */

	hid0 = mfspr(SPRN_HID0);
	hid0 |= HID0_CBE_THERM_INT_EN | HID0_CBE_THERM_WAKEUP |
		HID0_CBE_SYSERR_INT_EN | HID0_CBE_SYSERR_WAKEUP;
	mtspr(SPRN_HID0, hid0);
	mb();

	/*
	 * Install machine check handler. Leave setting of precise mode to
	 * what the firmware did for now
	 */
	ppc_md.machine_check_exception = cbe_machine_check_handler;
	mb();

	/*
	 * For now, we assume that IOC_FIR is already set to forward some
	 * error conditions to the System Error handler. If that is not true
	 * then it will have to be fixed up here.
	 */
}