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12#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14#include <linux/device.h>
15#include <linux/io.h>
16#include <linux/kernel.h>
17#include <linux/module.h>
18#include <linux/moduleparam.h>
19#include <linux/pci.h>
20#include <linux/pci_ids.h>
21#include <linux/types.h>
22#include <linux/watchdog.h>
23#include <asm/nmi.h>
24
25#define HPWDT_VERSION "2.0.3"
26#define SECS_TO_TICKS(secs) ((secs) * 1000 / 128)
27#define TICKS_TO_SECS(ticks) ((ticks) * 128 / 1000)
28#define HPWDT_MAX_TICKS 65535
29#define HPWDT_MAX_TIMER TICKS_TO_SECS(HPWDT_MAX_TICKS)
30#define DEFAULT_MARGIN 30
31#define PRETIMEOUT_SEC 9
32
33static bool ilo5;
34static unsigned int soft_margin = DEFAULT_MARGIN;
35static bool nowayout = WATCHDOG_NOWAYOUT;
36static bool pretimeout = IS_ENABLED(CONFIG_HPWDT_NMI_DECODING);
37static int kdumptimeout = -1;
38
39static void __iomem *pci_mem_addr;
40static unsigned long __iomem *hpwdt_nmistat;
41static unsigned long __iomem *hpwdt_timer_reg;
42static unsigned long __iomem *hpwdt_timer_con;
43
44static const struct pci_device_id hpwdt_devices[] = {
45 { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) },
46 { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) },
47 {0},
48};
49MODULE_DEVICE_TABLE(pci, hpwdt_devices);
50
51static const struct pci_device_id hpwdt_blacklist[] = {
52 { PCI_DEVICE_SUB(PCI_VENDOR_ID_HP, 0x3306, PCI_VENDOR_ID_HP, 0x1979) },
53 { PCI_DEVICE_SUB(PCI_VENDOR_ID_HP, 0x3306, PCI_VENDOR_ID_HP_3PAR, 0x0289) },
54 {0},
55};
56
57static struct watchdog_device hpwdt_dev;
58
59
60
61static int hpwdt_hw_is_running(void)
62{
63 return ioread8(hpwdt_timer_con) & 0x01;
64}
65
66static int hpwdt_start(struct watchdog_device *wdd)
67{
68 int control = 0x81 | (pretimeout ? 0x4 : 0);
69 int reload = SECS_TO_TICKS(min(wdd->timeout, wdd->max_hw_heartbeat_ms/1000));
70
71 dev_dbg(wdd->parent, "start watchdog 0x%08x:0x%08x:0x%02x\n", wdd->timeout, reload, control);
72 iowrite16(reload, hpwdt_timer_reg);
73 iowrite8(control, hpwdt_timer_con);
74
75 return 0;
76}
77
78static void hpwdt_stop(void)
79{
80 unsigned long data;
81
82 pr_debug("stop watchdog\n");
83
84 data = ioread8(hpwdt_timer_con);
85 data &= 0xFE;
86 iowrite8(data, hpwdt_timer_con);
87}
88
89static int hpwdt_stop_core(struct watchdog_device *wdd)
90{
91 hpwdt_stop();
92
93 return 0;
94}
95
96static void hpwdt_ping_ticks(int val)
97{
98 val = min(val, HPWDT_MAX_TICKS);
99 iowrite16(val, hpwdt_timer_reg);
100}
101
102static int hpwdt_ping(struct watchdog_device *wdd)
103{
104 int reload = SECS_TO_TICKS(min(wdd->timeout, wdd->max_hw_heartbeat_ms/1000));
105
106 dev_dbg(wdd->parent, "ping watchdog 0x%08x:0x%08x\n", wdd->timeout, reload);
107 hpwdt_ping_ticks(reload);
108
109 return 0;
110}
111
112static unsigned int hpwdt_gettimeleft(struct watchdog_device *wdd)
113{
114 return TICKS_TO_SECS(ioread16(hpwdt_timer_reg));
115}
116
117static int hpwdt_settimeout(struct watchdog_device *wdd, unsigned int val)
118{
119 dev_dbg(wdd->parent, "set_timeout = %d\n", val);
120
121 wdd->timeout = val;
122 if (val <= wdd->pretimeout) {
123 dev_dbg(wdd->parent, "pretimeout < timeout. Setting to zero\n");
124 wdd->pretimeout = 0;
125 pretimeout = 0;
126 if (watchdog_active(wdd))
127 hpwdt_start(wdd);
128 }
129 hpwdt_ping(wdd);
130
131 return 0;
132}
133
134#ifdef CONFIG_HPWDT_NMI_DECODING
135static int hpwdt_set_pretimeout(struct watchdog_device *wdd, unsigned int req)
136{
137 unsigned int val = 0;
138
139 dev_dbg(wdd->parent, "set_pretimeout = %d\n", req);
140 if (req) {
141 val = PRETIMEOUT_SEC;
142 if (val >= wdd->timeout)
143 return -EINVAL;
144 }
145
146 if (val != req)
147 dev_dbg(wdd->parent, "Rounding pretimeout to: %d\n", val);
148
149 wdd->pretimeout = val;
150 pretimeout = !!val;
151
152 if (watchdog_active(wdd))
153 hpwdt_start(wdd);
154
155 return 0;
156}
157
158static int hpwdt_my_nmi(void)
159{
160 return ioread8(hpwdt_nmistat) & 0x6;
161}
162
163
164
165
166static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs)
167{
168 unsigned int mynmi = hpwdt_my_nmi();
169 static char panic_msg[] =
170 "00: An NMI occurred. Depending on your system the reason "
171 "for the NMI is logged in any one of the following resources:\n"
172 "1. Integrated Management Log (IML)\n"
173 "2. OA Syslog\n"
174 "3. OA Forward Progress Log\n"
175 "4. iLO Event Log";
176
177 if (ilo5 && ulReason == NMI_UNKNOWN && !mynmi)
178 return NMI_DONE;
179
180 if (ilo5 && !pretimeout && !mynmi)
181 return NMI_DONE;
182
183 if (kdumptimeout < 0)
184 hpwdt_stop();
185 else if (kdumptimeout == 0)
186 ;
187 else {
188 unsigned int val = max((unsigned int)kdumptimeout, hpwdt_dev.timeout);
189 hpwdt_ping_ticks(SECS_TO_TICKS(val));
190 }
191
192 hex_byte_pack(panic_msg, mynmi);
193 nmi_panic(regs, panic_msg);
194
195 return NMI_HANDLED;
196}
197#endif
198
199
200static const struct watchdog_info ident = {
201 .options = WDIOF_PRETIMEOUT |
202 WDIOF_SETTIMEOUT |
203 WDIOF_KEEPALIVEPING |
204 WDIOF_MAGICCLOSE,
205 .identity = "HPE iLO2+ HW Watchdog Timer",
206};
207
208
209
210
211
212static const struct watchdog_ops hpwdt_ops = {
213 .owner = THIS_MODULE,
214 .start = hpwdt_start,
215 .stop = hpwdt_stop_core,
216 .ping = hpwdt_ping,
217 .set_timeout = hpwdt_settimeout,
218 .get_timeleft = hpwdt_gettimeleft,
219#ifdef CONFIG_HPWDT_NMI_DECODING
220 .set_pretimeout = hpwdt_set_pretimeout,
221#endif
222};
223
224static struct watchdog_device hpwdt_dev = {
225 .info = &ident,
226 .ops = &hpwdt_ops,
227 .min_timeout = 1,
228 .timeout = DEFAULT_MARGIN,
229 .pretimeout = PRETIMEOUT_SEC,
230 .max_hw_heartbeat_ms = HPWDT_MAX_TIMER * 1000,
231};
232
233
234
235
236
237
238static int hpwdt_init_nmi_decoding(struct pci_dev *dev)
239{
240#ifdef CONFIG_HPWDT_NMI_DECODING
241 int retval;
242
243
244
245 retval = register_nmi_handler(NMI_UNKNOWN, hpwdt_pretimeout, 0, "hpwdt");
246 if (retval)
247 goto error;
248 retval = register_nmi_handler(NMI_SERR, hpwdt_pretimeout, 0, "hpwdt");
249 if (retval)
250 goto error1;
251 retval = register_nmi_handler(NMI_IO_CHECK, hpwdt_pretimeout, 0, "hpwdt");
252 if (retval)
253 goto error2;
254
255 dev_info(&dev->dev,
256 "HPE Watchdog Timer Driver: NMI decoding initialized\n");
257
258 return 0;
259
260error2:
261 unregister_nmi_handler(NMI_SERR, "hpwdt");
262error1:
263 unregister_nmi_handler(NMI_UNKNOWN, "hpwdt");
264error:
265 dev_warn(&dev->dev,
266 "Unable to register a die notifier (err=%d).\n",
267 retval);
268 return retval;
269#endif
270 return 0;
271}
272
273static void hpwdt_exit_nmi_decoding(void)
274{
275#ifdef CONFIG_HPWDT_NMI_DECODING
276 unregister_nmi_handler(NMI_UNKNOWN, "hpwdt");
277 unregister_nmi_handler(NMI_SERR, "hpwdt");
278 unregister_nmi_handler(NMI_IO_CHECK, "hpwdt");
279#endif
280}
281
282static int hpwdt_init_one(struct pci_dev *dev,
283 const struct pci_device_id *ent)
284{
285 int retval;
286
287
288
289
290
291
292 if (dev->subsystem_vendor != PCI_VENDOR_ID_HP &&
293 dev->subsystem_vendor != PCI_VENDOR_ID_HP_3PAR) {
294 dev_warn(&dev->dev,
295 "This server does not have an iLO2+ ASIC.\n");
296 return -ENODEV;
297 }
298
299 if (pci_match_id(hpwdt_blacklist, dev)) {
300 dev_dbg(&dev->dev, "Not supported on this device\n");
301 return -ENODEV;
302 }
303
304 if (pci_enable_device(dev)) {
305 dev_warn(&dev->dev,
306 "Not possible to enable PCI Device: 0x%x:0x%x.\n",
307 ent->vendor, ent->device);
308 return -ENODEV;
309 }
310
311 pci_mem_addr = pci_iomap(dev, 1, 0x80);
312 if (!pci_mem_addr) {
313 dev_warn(&dev->dev,
314 "Unable to detect the iLO2+ server memory.\n");
315 retval = -ENOMEM;
316 goto error_pci_iomap;
317 }
318 hpwdt_nmistat = pci_mem_addr + 0x6e;
319 hpwdt_timer_reg = pci_mem_addr + 0x70;
320 hpwdt_timer_con = pci_mem_addr + 0x72;
321
322
323 if (hpwdt_hw_is_running()) {
324 dev_info(&dev->dev, "timer is running\n");
325 set_bit(WDOG_HW_RUNNING, &hpwdt_dev.status);
326 }
327
328
329 retval = hpwdt_init_nmi_decoding(dev);
330 if (retval != 0)
331 goto error_init_nmi_decoding;
332
333 watchdog_stop_on_unregister(&hpwdt_dev);
334 watchdog_set_nowayout(&hpwdt_dev, nowayout);
335 watchdog_init_timeout(&hpwdt_dev, soft_margin, NULL);
336
337 if (pretimeout && hpwdt_dev.timeout <= PRETIMEOUT_SEC) {
338 dev_warn(&dev->dev, "timeout <= pretimeout. Setting pretimeout to zero\n");
339 pretimeout = 0;
340 }
341 hpwdt_dev.pretimeout = pretimeout ? PRETIMEOUT_SEC : 0;
342 kdumptimeout = min(kdumptimeout, HPWDT_MAX_TIMER);
343
344 hpwdt_dev.parent = &dev->dev;
345 retval = watchdog_register_device(&hpwdt_dev);
346 if (retval < 0)
347 goto error_wd_register;
348
349 dev_info(&dev->dev, "HPE Watchdog Timer Driver: Version: %s\n",
350 HPWDT_VERSION);
351 dev_info(&dev->dev, "timeout: %d seconds (nowayout=%d)\n",
352 hpwdt_dev.timeout, nowayout);
353 dev_info(&dev->dev, "pretimeout: %s.\n",
354 pretimeout ? "on" : "off");
355 dev_info(&dev->dev, "kdumptimeout: %d.\n", kdumptimeout);
356
357 if (dev->subsystem_vendor == PCI_VENDOR_ID_HP_3PAR)
358 ilo5 = true;
359
360 return 0;
361
362error_wd_register:
363 hpwdt_exit_nmi_decoding();
364error_init_nmi_decoding:
365 pci_iounmap(dev, pci_mem_addr);
366error_pci_iomap:
367 pci_disable_device(dev);
368 return retval;
369}
370
371static void hpwdt_exit(struct pci_dev *dev)
372{
373 watchdog_unregister_device(&hpwdt_dev);
374 hpwdt_exit_nmi_decoding();
375 pci_iounmap(dev, pci_mem_addr);
376 pci_disable_device(dev);
377}
378
379static struct pci_driver hpwdt_driver = {
380 .name = "hpwdt",
381 .id_table = hpwdt_devices,
382 .probe = hpwdt_init_one,
383 .remove = hpwdt_exit,
384};
385
386MODULE_AUTHOR("Tom Mingarelli");
387MODULE_DESCRIPTION("hpe watchdog driver");
388MODULE_LICENSE("GPL");
389MODULE_VERSION(HPWDT_VERSION);
390
391module_param(soft_margin, int, 0);
392MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
393
394module_param_named(timeout, soft_margin, int, 0);
395MODULE_PARM_DESC(timeout, "Alias of soft_margin");
396
397module_param(nowayout, bool, 0);
398MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
399 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
400
401module_param(kdumptimeout, int, 0444);
402MODULE_PARM_DESC(kdumptimeout, "Timeout applied for crash kernel transition in seconds");
403
404#ifdef CONFIG_HPWDT_NMI_DECODING
405module_param(pretimeout, bool, 0);
406MODULE_PARM_DESC(pretimeout, "Watchdog pretimeout enabled");
407#endif
408
409module_pci_driver(hpwdt_driver);
410
