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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#include <linux/crash_dump.h>
25
26#define HPWDT_VERSION "2.0.4"
27#define SECS_TO_TICKS(secs) ((secs) * 1000 / 128)
28#define TICKS_TO_SECS(ticks) ((ticks) * 128 / 1000)
29#define HPWDT_MAX_TICKS 65535
30#define HPWDT_MAX_TIMER TICKS_TO_SECS(HPWDT_MAX_TICKS)
31#define DEFAULT_MARGIN 30
32#define PRETIMEOUT_SEC 9
33
34static bool ilo5;
35static unsigned int soft_margin = DEFAULT_MARGIN;
36static bool nowayout = WATCHDOG_NOWAYOUT;
37static bool pretimeout = IS_ENABLED(CONFIG_HPWDT_NMI_DECODING);
38static int kdumptimeout = -1;
39
40static void __iomem *pci_mem_addr;
41static unsigned long __iomem *hpwdt_nmistat;
42static unsigned long __iomem *hpwdt_timer_reg;
43static unsigned long __iomem *hpwdt_timer_con;
44
45static const struct pci_device_id hpwdt_devices[] = {
46 { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) },
47 { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) },
48 {0},
49};
50MODULE_DEVICE_TABLE(pci, hpwdt_devices);
51
52static const struct pci_device_id hpwdt_blacklist[] = {
53 { PCI_DEVICE_SUB(PCI_VENDOR_ID_HP, 0x3306, PCI_VENDOR_ID_HP, 0x1979) },
54 { PCI_DEVICE_SUB(PCI_VENDOR_ID_HP, 0x3306, PCI_VENDOR_ID_HP_3PAR, 0x0289) },
55 {0},
56};
57
58static struct watchdog_device hpwdt_dev;
59
60
61
62static int hpwdt_hw_is_running(void)
63{
64 return ioread8(hpwdt_timer_con) & 0x01;
65}
66
67static int hpwdt_start(struct watchdog_device *wdd)
68{
69 int control = 0x81 | (pretimeout ? 0x4 : 0);
70 int reload = SECS_TO_TICKS(min(wdd->timeout, wdd->max_hw_heartbeat_ms/1000));
71
72 dev_dbg(wdd->parent, "start watchdog 0x%08x:0x%08x:0x%02x\n", wdd->timeout, reload, control);
73 iowrite16(reload, hpwdt_timer_reg);
74 iowrite8(control, hpwdt_timer_con);
75
76 return 0;
77}
78
79static void hpwdt_stop(void)
80{
81 unsigned long data;
82
83 pr_debug("stop watchdog\n");
84
85 data = ioread8(hpwdt_timer_con);
86 data &= 0xFE;
87 iowrite8(data, hpwdt_timer_con);
88}
89
90static int hpwdt_stop_core(struct watchdog_device *wdd)
91{
92 hpwdt_stop();
93
94 return 0;
95}
96
97static void hpwdt_ping_ticks(int val)
98{
99 val = min(val, HPWDT_MAX_TICKS);
100 iowrite16(val, hpwdt_timer_reg);
101}
102
103static int hpwdt_ping(struct watchdog_device *wdd)
104{
105 int reload = SECS_TO_TICKS(min(wdd->timeout, wdd->max_hw_heartbeat_ms/1000));
106
107 dev_dbg(wdd->parent, "ping watchdog 0x%08x:0x%08x\n", wdd->timeout, reload);
108 hpwdt_ping_ticks(reload);
109
110 return 0;
111}
112
113static unsigned int hpwdt_gettimeleft(struct watchdog_device *wdd)
114{
115 return TICKS_TO_SECS(ioread16(hpwdt_timer_reg));
116}
117
118static int hpwdt_settimeout(struct watchdog_device *wdd, unsigned int val)
119{
120 dev_dbg(wdd->parent, "set_timeout = %d\n", val);
121
122 wdd->timeout = val;
123 if (val <= wdd->pretimeout) {
124 dev_dbg(wdd->parent, "pretimeout < timeout. Setting to zero\n");
125 wdd->pretimeout = 0;
126 pretimeout = 0;
127 if (watchdog_active(wdd))
128 hpwdt_start(wdd);
129 }
130 hpwdt_ping(wdd);
131
132 return 0;
133}
134
135#ifdef CONFIG_HPWDT_NMI_DECODING
136static int hpwdt_set_pretimeout(struct watchdog_device *wdd, unsigned int req)
137{
138 unsigned int val = 0;
139
140 dev_dbg(wdd->parent, "set_pretimeout = %d\n", req);
141 if (req) {
142 val = PRETIMEOUT_SEC;
143 if (val >= wdd->timeout)
144 return -EINVAL;
145 }
146
147 if (val != req)
148 dev_dbg(wdd->parent, "Rounding pretimeout to: %d\n", val);
149
150 wdd->pretimeout = val;
151 pretimeout = !!val;
152
153 if (watchdog_active(wdd))
154 hpwdt_start(wdd);
155
156 return 0;
157}
158
159static int hpwdt_my_nmi(void)
160{
161 return ioread8(hpwdt_nmistat) & 0x6;
162}
163
164
165
166
167static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs)
168{
169 unsigned int mynmi = hpwdt_my_nmi();
170 static char panic_msg[] =
171 "00: An NMI occurred. Depending on your system the reason "
172 "for the NMI is logged in any one of the following resources:\n"
173 "1. Integrated Management Log (IML)\n"
174 "2. OA Syslog\n"
175 "3. OA Forward Progress Log\n"
176 "4. iLO Event Log";
177
178 if (ilo5 && ulReason == NMI_UNKNOWN && !mynmi)
179 return NMI_DONE;
180
181 if (ilo5 && !pretimeout && !mynmi)
182 return NMI_DONE;
183
184 if (kdumptimeout < 0)
185 hpwdt_stop();
186 else if (kdumptimeout == 0)
187 ;
188 else {
189 unsigned int val = max((unsigned int)kdumptimeout, hpwdt_dev.timeout);
190 hpwdt_ping_ticks(SECS_TO_TICKS(val));
191 }
192
193 hex_byte_pack(panic_msg, mynmi);
194 nmi_panic(regs, panic_msg);
195
196 return NMI_HANDLED;
197}
198#endif
199
200
201static const struct watchdog_info ident = {
202 .options = WDIOF_PRETIMEOUT |
203 WDIOF_SETTIMEOUT |
204 WDIOF_KEEPALIVEPING |
205 WDIOF_MAGICCLOSE,
206 .identity = "HPE iLO2+ HW Watchdog Timer",
207};
208
209
210
211
212
213static const struct watchdog_ops hpwdt_ops = {
214 .owner = THIS_MODULE,
215 .start = hpwdt_start,
216 .stop = hpwdt_stop_core,
217 .ping = hpwdt_ping,
218 .set_timeout = hpwdt_settimeout,
219 .get_timeleft = hpwdt_gettimeleft,
220#ifdef CONFIG_HPWDT_NMI_DECODING
221 .set_pretimeout = hpwdt_set_pretimeout,
222#endif
223};
224
225static struct watchdog_device hpwdt_dev = {
226 .info = &ident,
227 .ops = &hpwdt_ops,
228 .min_timeout = 1,
229 .timeout = DEFAULT_MARGIN,
230 .pretimeout = PRETIMEOUT_SEC,
231 .max_hw_heartbeat_ms = HPWDT_MAX_TIMER * 1000,
232};
233
234
235
236
237
238
239static int hpwdt_init_nmi_decoding(struct pci_dev *dev)
240{
241#ifdef CONFIG_HPWDT_NMI_DECODING
242 int retval;
243
244
245
246 retval = register_nmi_handler(NMI_UNKNOWN, hpwdt_pretimeout, 0, "hpwdt");
247 if (retval)
248 goto error;
249 retval = register_nmi_handler(NMI_SERR, hpwdt_pretimeout, 0, "hpwdt");
250 if (retval)
251 goto error1;
252 retval = register_nmi_handler(NMI_IO_CHECK, hpwdt_pretimeout, 0, "hpwdt");
253 if (retval)
254 goto error2;
255
256 dev_info(&dev->dev,
257 "HPE Watchdog Timer Driver: NMI decoding initialized\n");
258
259 return 0;
260
261error2:
262 unregister_nmi_handler(NMI_SERR, "hpwdt");
263error1:
264 unregister_nmi_handler(NMI_UNKNOWN, "hpwdt");
265error:
266 dev_warn(&dev->dev,
267 "Unable to register a die notifier (err=%d).\n",
268 retval);
269 return retval;
270#endif
271 return 0;
272}
273
274static void hpwdt_exit_nmi_decoding(void)
275{
276#ifdef CONFIG_HPWDT_NMI_DECODING
277 unregister_nmi_handler(NMI_UNKNOWN, "hpwdt");
278 unregister_nmi_handler(NMI_SERR, "hpwdt");
279 unregister_nmi_handler(NMI_IO_CHECK, "hpwdt");
280#endif
281}
282
283static int hpwdt_init_one(struct pci_dev *dev,
284 const struct pci_device_id *ent)
285{
286 int retval;
287
288
289
290
291
292
293 if (dev->subsystem_vendor != PCI_VENDOR_ID_HP &&
294 dev->subsystem_vendor != PCI_VENDOR_ID_HP_3PAR) {
295 dev_warn(&dev->dev,
296 "This server does not have an iLO2+ ASIC.\n");
297 return -ENODEV;
298 }
299
300 if (pci_match_id(hpwdt_blacklist, dev)) {
301 dev_dbg(&dev->dev, "Not supported on this device\n");
302 return -ENODEV;
303 }
304
305 if (pci_enable_device(dev)) {
306 dev_warn(&dev->dev,
307 "Not possible to enable PCI Device: 0x%x:0x%x.\n",
308 ent->vendor, ent->device);
309 return -ENODEV;
310 }
311
312 pci_mem_addr = pci_iomap(dev, 1, 0x80);
313 if (!pci_mem_addr) {
314 dev_warn(&dev->dev,
315 "Unable to detect the iLO2+ server memory.\n");
316 retval = -ENOMEM;
317 goto error_pci_iomap;
318 }
319 hpwdt_nmistat = pci_mem_addr + 0x6e;
320 hpwdt_timer_reg = pci_mem_addr + 0x70;
321 hpwdt_timer_con = pci_mem_addr + 0x72;
322
323
324 if (hpwdt_hw_is_running()) {
325 dev_info(&dev->dev, "timer is running\n");
326 set_bit(WDOG_HW_RUNNING, &hpwdt_dev.status);
327 }
328
329
330 retval = hpwdt_init_nmi_decoding(dev);
331 if (retval != 0)
332 goto error_init_nmi_decoding;
333
334 watchdog_stop_on_unregister(&hpwdt_dev);
335 watchdog_set_nowayout(&hpwdt_dev, nowayout);
336 watchdog_init_timeout(&hpwdt_dev, soft_margin, NULL);
337
338 if (is_kdump_kernel()) {
339 pretimeout = 0;
340 kdumptimeout = 0;
341 }
342
343 if (pretimeout && hpwdt_dev.timeout <= PRETIMEOUT_SEC) {
344 dev_warn(&dev->dev, "timeout <= pretimeout. Setting pretimeout to zero\n");
345 pretimeout = 0;
346 }
347 hpwdt_dev.pretimeout = pretimeout ? PRETIMEOUT_SEC : 0;
348 kdumptimeout = min(kdumptimeout, HPWDT_MAX_TIMER);
349
350 hpwdt_dev.parent = &dev->dev;
351 retval = watchdog_register_device(&hpwdt_dev);
352 if (retval < 0)
353 goto error_wd_register;
354
355 dev_info(&dev->dev, "HPE Watchdog Timer Driver: Version: %s\n",
356 HPWDT_VERSION);
357 dev_info(&dev->dev, "timeout: %d seconds (nowayout=%d)\n",
358 hpwdt_dev.timeout, nowayout);
359 dev_info(&dev->dev, "pretimeout: %s.\n",
360 pretimeout ? "on" : "off");
361 dev_info(&dev->dev, "kdumptimeout: %d.\n", kdumptimeout);
362
363 if (dev->subsystem_vendor == PCI_VENDOR_ID_HP_3PAR)
364 ilo5 = true;
365
366 return 0;
367
368error_wd_register:
369 hpwdt_exit_nmi_decoding();
370error_init_nmi_decoding:
371 pci_iounmap(dev, pci_mem_addr);
372error_pci_iomap:
373 pci_disable_device(dev);
374 return retval;
375}
376
377static void hpwdt_exit(struct pci_dev *dev)
378{
379 watchdog_unregister_device(&hpwdt_dev);
380 hpwdt_exit_nmi_decoding();
381 pci_iounmap(dev, pci_mem_addr);
382 pci_disable_device(dev);
383}
384
385static struct pci_driver hpwdt_driver = {
386 .name = "hpwdt",
387 .id_table = hpwdt_devices,
388 .probe = hpwdt_init_one,
389 .remove = hpwdt_exit,
390};
391
392MODULE_AUTHOR("Tom Mingarelli");
393MODULE_DESCRIPTION("hpe watchdog driver");
394MODULE_LICENSE("GPL");
395MODULE_VERSION(HPWDT_VERSION);
396
397module_param(soft_margin, int, 0);
398MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
399
400module_param_named(timeout, soft_margin, int, 0);
401MODULE_PARM_DESC(timeout, "Alias of soft_margin");
402
403module_param(nowayout, bool, 0);
404MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
405 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
406
407module_param(kdumptimeout, int, 0444);
408MODULE_PARM_DESC(kdumptimeout, "Timeout applied for crash kernel transition in seconds");
409
410#ifdef CONFIG_HPWDT_NMI_DECODING
411module_param(pretimeout, bool, 0);
412MODULE_PARM_DESC(pretimeout, "Watchdog pretimeout enabled");
413#endif
414
415module_pci_driver(hpwdt_driver);
416
