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16#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
17
18#include <linux/device.h>
19#include <linux/io.h>
20#include <linux/kernel.h>
21#include <linux/module.h>
22#include <linux/moduleparam.h>
23#include <linux/pci.h>
24#include <linux/pci_ids.h>
25#include <linux/types.h>
26#include <linux/watchdog.h>
27#include <asm/nmi.h>
28
29#define HPWDT_VERSION "2.0.2"
30#define SECS_TO_TICKS(secs) ((secs) * 1000 / 128)
31#define TICKS_TO_SECS(ticks) ((ticks) * 128 / 1000)
32#define HPWDT_MAX_TIMER TICKS_TO_SECS(65535)
33#define DEFAULT_MARGIN 30
34#define PRETIMEOUT_SEC 9
35
36static bool ilo5;
37static unsigned int soft_margin = DEFAULT_MARGIN;
38static bool nowayout = WATCHDOG_NOWAYOUT;
39static bool pretimeout = IS_ENABLED(CONFIG_HPWDT_NMI_DECODING);
40
41static void __iomem *pci_mem_addr;
42static unsigned long __iomem *hpwdt_nmistat;
43static unsigned long __iomem *hpwdt_timer_reg;
44static unsigned long __iomem *hpwdt_timer_con;
45
46static const struct pci_device_id hpwdt_devices[] = {
47 { PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) },
48 { PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) },
49 {0},
50};
51MODULE_DEVICE_TABLE(pci, hpwdt_devices);
52
53static const struct pci_device_id hpwdt_blacklist[] = {
54 { PCI_DEVICE_SUB(PCI_VENDOR_ID_HP, 0x3306, PCI_VENDOR_ID_HP, 0x1979) },
55 { PCI_DEVICE_SUB(PCI_VENDOR_ID_HP, 0x3306, PCI_VENDOR_ID_HP_3PAR, 0x0289) },
56 {0},
57};
58
59
60
61
62static int hpwdt_start(struct watchdog_device *wdd)
63{
64 int control = 0x81 | (pretimeout ? 0x4 : 0);
65 int reload = SECS_TO_TICKS(wdd->timeout);
66
67 dev_dbg(wdd->parent, "start watchdog 0x%08x:0x%02x\n", reload, control);
68 iowrite16(reload, hpwdt_timer_reg);
69 iowrite8(control, hpwdt_timer_con);
70
71 return 0;
72}
73
74static void hpwdt_stop(void)
75{
76 unsigned long data;
77
78 pr_debug("stop watchdog\n");
79
80 data = ioread8(hpwdt_timer_con);
81 data &= 0xFE;
82 iowrite8(data, hpwdt_timer_con);
83}
84
85static int hpwdt_stop_core(struct watchdog_device *wdd)
86{
87 hpwdt_stop();
88
89 return 0;
90}
91
92static int hpwdt_ping(struct watchdog_device *wdd)
93{
94 int reload = SECS_TO_TICKS(wdd->timeout);
95
96 dev_dbg(wdd->parent, "ping watchdog 0x%08x\n", reload);
97 iowrite16(reload, hpwdt_timer_reg);
98
99 return 0;
100}
101
102static unsigned int hpwdt_gettimeleft(struct watchdog_device *wdd)
103{
104 return TICKS_TO_SECS(ioread16(hpwdt_timer_reg));
105}
106
107static int hpwdt_settimeout(struct watchdog_device *wdd, unsigned int val)
108{
109 dev_dbg(wdd->parent, "set_timeout = %d\n", val);
110
111 wdd->timeout = val;
112 if (val <= wdd->pretimeout) {
113 dev_dbg(wdd->parent, "pretimeout < timeout. Setting to zero\n");
114 wdd->pretimeout = 0;
115 pretimeout = 0;
116 if (watchdog_active(wdd))
117 hpwdt_start(wdd);
118 }
119 hpwdt_ping(wdd);
120
121 return 0;
122}
123
124#ifdef CONFIG_HPWDT_NMI_DECODING
125static int hpwdt_set_pretimeout(struct watchdog_device *wdd, unsigned int req)
126{
127 unsigned int val = 0;
128
129 dev_dbg(wdd->parent, "set_pretimeout = %d\n", req);
130 if (req) {
131 val = PRETIMEOUT_SEC;
132 if (val >= wdd->timeout)
133 return -EINVAL;
134 }
135
136 if (val != req)
137 dev_dbg(wdd->parent, "Rounding pretimeout to: %d\n", val);
138
139 wdd->pretimeout = val;
140 pretimeout = !!val;
141
142 if (watchdog_active(wdd))
143 hpwdt_start(wdd);
144
145 return 0;
146}
147
148static int hpwdt_my_nmi(void)
149{
150 return ioread8(hpwdt_nmistat) & 0x6;
151}
152
153
154
155
156static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs)
157{
158 unsigned int mynmi = hpwdt_my_nmi();
159 static char panic_msg[] =
160 "00: An NMI occurred. Depending on your system the reason "
161 "for the NMI is logged in any one of the following resources:\n"
162 "1. Integrated Management Log (IML)\n"
163 "2. OA Syslog\n"
164 "3. OA Forward Progress Log\n"
165 "4. iLO Event Log";
166
167 if (ilo5 && ulReason == NMI_UNKNOWN && !mynmi)
168 return NMI_DONE;
169
170 if (ilo5 && !pretimeout && !mynmi)
171 return NMI_DONE;
172
173 hpwdt_stop();
174
175 hex_byte_pack(panic_msg, mynmi);
176 nmi_panic(regs, panic_msg);
177
178 return NMI_HANDLED;
179}
180#endif
181
182
183static const struct watchdog_info ident = {
184 .options = WDIOF_PRETIMEOUT |
185 WDIOF_SETTIMEOUT |
186 WDIOF_KEEPALIVEPING |
187 WDIOF_MAGICCLOSE,
188 .identity = "HPE iLO2+ HW Watchdog Timer",
189};
190
191
192
193
194
195static const struct watchdog_ops hpwdt_ops = {
196 .owner = THIS_MODULE,
197 .start = hpwdt_start,
198 .stop = hpwdt_stop_core,
199 .ping = hpwdt_ping,
200 .set_timeout = hpwdt_settimeout,
201 .get_timeleft = hpwdt_gettimeleft,
202#ifdef CONFIG_HPWDT_NMI_DECODING
203 .set_pretimeout = hpwdt_set_pretimeout,
204#endif
205};
206
207static struct watchdog_device hpwdt_dev = {
208 .info = &ident,
209 .ops = &hpwdt_ops,
210 .min_timeout = 1,
211 .max_timeout = HPWDT_MAX_TIMER,
212 .timeout = DEFAULT_MARGIN,
213 .pretimeout = PRETIMEOUT_SEC,
214};
215
216
217
218
219
220
221static int hpwdt_init_nmi_decoding(struct pci_dev *dev)
222{
223#ifdef CONFIG_HPWDT_NMI_DECODING
224 int retval;
225
226
227
228 retval = register_nmi_handler(NMI_UNKNOWN, hpwdt_pretimeout, 0, "hpwdt");
229 if (retval)
230 goto error;
231 retval = register_nmi_handler(NMI_SERR, hpwdt_pretimeout, 0, "hpwdt");
232 if (retval)
233 goto error1;
234 retval = register_nmi_handler(NMI_IO_CHECK, hpwdt_pretimeout, 0, "hpwdt");
235 if (retval)
236 goto error2;
237
238 dev_info(&dev->dev,
239 "HPE Watchdog Timer Driver: NMI decoding initialized\n");
240
241 return 0;
242
243error2:
244 unregister_nmi_handler(NMI_SERR, "hpwdt");
245error1:
246 unregister_nmi_handler(NMI_UNKNOWN, "hpwdt");
247error:
248 dev_warn(&dev->dev,
249 "Unable to register a die notifier (err=%d).\n",
250 retval);
251 return retval;
252#endif
253 return 0;
254}
255
256static void hpwdt_exit_nmi_decoding(void)
257{
258#ifdef CONFIG_HPWDT_NMI_DECODING
259 unregister_nmi_handler(NMI_UNKNOWN, "hpwdt");
260 unregister_nmi_handler(NMI_SERR, "hpwdt");
261 unregister_nmi_handler(NMI_IO_CHECK, "hpwdt");
262#endif
263}
264
265static int hpwdt_init_one(struct pci_dev *dev,
266 const struct pci_device_id *ent)
267{
268 int retval;
269
270
271
272
273
274
275 if (dev->subsystem_vendor != PCI_VENDOR_ID_HP &&
276 dev->subsystem_vendor != PCI_VENDOR_ID_HP_3PAR) {
277 dev_warn(&dev->dev,
278 "This server does not have an iLO2+ ASIC.\n");
279 return -ENODEV;
280 }
281
282 if (pci_match_id(hpwdt_blacklist, dev)) {
283 dev_dbg(&dev->dev, "Not supported on this device\n");
284 return -ENODEV;
285 }
286
287 if (pci_enable_device(dev)) {
288 dev_warn(&dev->dev,
289 "Not possible to enable PCI Device: 0x%x:0x%x.\n",
290 ent->vendor, ent->device);
291 return -ENODEV;
292 }
293
294 pci_mem_addr = pci_iomap(dev, 1, 0x80);
295 if (!pci_mem_addr) {
296 dev_warn(&dev->dev,
297 "Unable to detect the iLO2+ server memory.\n");
298 retval = -ENOMEM;
299 goto error_pci_iomap;
300 }
301 hpwdt_nmistat = pci_mem_addr + 0x6e;
302 hpwdt_timer_reg = pci_mem_addr + 0x70;
303 hpwdt_timer_con = pci_mem_addr + 0x72;
304
305
306 hpwdt_stop();
307
308
309 retval = hpwdt_init_nmi_decoding(dev);
310 if (retval != 0)
311 goto error_init_nmi_decoding;
312
313 watchdog_set_nowayout(&hpwdt_dev, nowayout);
314 if (watchdog_init_timeout(&hpwdt_dev, soft_margin, NULL))
315 dev_warn(&dev->dev, "Invalid soft_margin: %d.\n", soft_margin);
316
317 if (pretimeout && hpwdt_dev.timeout <= PRETIMEOUT_SEC) {
318 dev_warn(&dev->dev, "timeout <= pretimeout. Setting pretimeout to zero\n");
319 pretimeout = 0;
320 }
321 hpwdt_dev.pretimeout = pretimeout ? PRETIMEOUT_SEC : 0;
322
323 hpwdt_dev.parent = &dev->dev;
324 retval = watchdog_register_device(&hpwdt_dev);
325 if (retval < 0) {
326 dev_err(&dev->dev, "watchdog register failed: %d.\n", retval);
327 goto error_wd_register;
328 }
329
330 dev_info(&dev->dev, "HPE Watchdog Timer Driver: Version: %s\n",
331 HPWDT_VERSION);
332 dev_info(&dev->dev, "timeout: %d seconds (nowayout=%d)\n",
333 hpwdt_dev.timeout, nowayout);
334 dev_info(&dev->dev, "pretimeout: %s.\n",
335 pretimeout ? "on" : "off");
336
337 if (dev->subsystem_vendor == PCI_VENDOR_ID_HP_3PAR)
338 ilo5 = true;
339
340 return 0;
341
342error_wd_register:
343 hpwdt_exit_nmi_decoding();
344error_init_nmi_decoding:
345 pci_iounmap(dev, pci_mem_addr);
346error_pci_iomap:
347 pci_disable_device(dev);
348 return retval;
349}
350
351static void hpwdt_exit(struct pci_dev *dev)
352{
353 if (!nowayout)
354 hpwdt_stop();
355
356 watchdog_unregister_device(&hpwdt_dev);
357 hpwdt_exit_nmi_decoding();
358 pci_iounmap(dev, pci_mem_addr);
359 pci_disable_device(dev);
360}
361
362static struct pci_driver hpwdt_driver = {
363 .name = "hpwdt",
364 .id_table = hpwdt_devices,
365 .probe = hpwdt_init_one,
366 .remove = hpwdt_exit,
367};
368
369MODULE_AUTHOR("Tom Mingarelli");
370MODULE_DESCRIPTION("hpe watchdog driver");
371MODULE_LICENSE("GPL");
372MODULE_VERSION(HPWDT_VERSION);
373
374module_param(soft_margin, int, 0);
375MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
376
377module_param_named(timeout, soft_margin, int, 0);
378MODULE_PARM_DESC(timeout, "Alias of soft_margin");
379
380module_param(nowayout, bool, 0);
381MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
382 __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
383
384#ifdef CONFIG_HPWDT_NMI_DECODING
385module_param(pretimeout, bool, 0);
386MODULE_PARM_DESC(pretimeout, "Watchdog pretimeout enabled");
387#endif
388
389module_pci_driver(hpwdt_driver);
390
