disable pwm7

hc

2024-05-10 23fa18eaa71266feff7ba8d83022d9e1cc83c65a

 kernel/drivers/watchdog/hpwdt.c
..
..
@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
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2
 /*
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  *	HPE WatchDog Driver
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  *	based on
..
..
@@ -6,11 +7,6 @@
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  *
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  *	(c) Copyright 2018 Hewlett Packard Enterprise Development LP
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9
  *	Thomas Mingarelli <thomas.mingarelli@hpe.com>
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- *
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- *	This program is free software; you can redistribute it and/or
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- *	modify it under the terms of the GNU General Public License
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- *	version 2 as published by the Free Software Foundation
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- *
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10
  */
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11
 
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12
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
..
..
@@ -26,10 +22,11 @@
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22
 #include <linux/watchdog.h>
27
23
 #include <asm/nmi.h>
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24
 
29
-#define HPWDT_VERSION			"2.0.0"
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+#define HPWDT_VERSION			"2.0.3"
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26
 #define SECS_TO_TICKS(secs)		((secs) * 1000 / 128)
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27
 #define TICKS_TO_SECS(ticks)		((ticks) * 128 / 1000)
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-#define HPWDT_MAX_TIMER			TICKS_TO_SECS(65535)
28
+#define HPWDT_MAX_TICKS			65535
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+#define HPWDT_MAX_TIMER			TICKS_TO_SECS(HPWDT_MAX_TICKS)
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30
 #define DEFAULT_MARGIN			30
34
31
 #define PRETIMEOUT_SEC			9
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32
 
..
..
@@ -37,6 +34,7 @@
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34
 static unsigned int soft_margin = DEFAULT_MARGIN;	/* in seconds */
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35
 static bool nowayout = WATCHDOG_NOWAYOUT;
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36
 static bool pretimeout = IS_ENABLED(CONFIG_HPWDT_NMI_DECODING);
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+static int kdumptimeout = -1;
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38
 
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 static void __iomem *pci_mem_addr;		/* the PCI-memory address */
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40
 static unsigned long __iomem *hpwdt_nmistat;
..
..
@@ -50,16 +48,27 @@
50
48
 };
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49
 MODULE_DEVICE_TABLE(pci, hpwdt_devices);
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50
 
51
+static const struct pci_device_id hpwdt_blacklist[] = {
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+	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_HP, 0x3306, PCI_VENDOR_ID_HP, 0x1979) }, /* auxilary iLO */
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+	{ PCI_DEVICE_SUB(PCI_VENDOR_ID_HP, 0x3306, PCI_VENDOR_ID_HP_3PAR, 0x0289) },  /* CL */
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+	{0},			/* terminate list */
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+};
53
56
 
57
+static struct watchdog_device hpwdt_dev;
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 /*
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  *	Watchdog operations
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60
  */
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+static int hpwdt_hw_is_running(void)
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+{
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+	return ioread8(hpwdt_timer_con) & 0x01;
64
+}
65
+
57
66
 static int hpwdt_start(struct watchdog_device *wdd)
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67
 {
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68
 	int control = 0x81 | (pretimeout ? 0x4 : 0);
60
-	int reload = SECS_TO_TICKS(wdd->timeout);
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+	int reload = SECS_TO_TICKS(min(wdd->timeout, wdd->max_hw_heartbeat_ms/1000));
61
70
 
62
-	dev_dbg(wdd->parent, "start watchdog 0x%08x:0x%02x\n", reload, control);
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+	dev_dbg(wdd->parent, "start watchdog 0x%08x:0x%08x:0x%02x\n", wdd->timeout, reload, control);
63
72
 	iowrite16(reload, hpwdt_timer_reg);
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73
 	iowrite8(control, hpwdt_timer_con);
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74
 
..
..
@@ -84,12 +93,18 @@
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93
 	return 0;
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94
 }
86
95
 
96
+static void hpwdt_ping_ticks(int val)
97
+{
98
+	val = min(val, HPWDT_MAX_TICKS);
99
+	iowrite16(val, hpwdt_timer_reg);
100
+}
101
+
87
102
 static int hpwdt_ping(struct watchdog_device *wdd)
88
103
 {
89
-	int reload = SECS_TO_TICKS(wdd->timeout);
104
+	int reload = SECS_TO_TICKS(min(wdd->timeout, wdd->max_hw_heartbeat_ms/1000));
90
105
 
91
-	dev_dbg(wdd->parent, "ping  watchdog 0x%08x\n", reload);
92
-	iowrite16(reload, hpwdt_timer_reg);
106
+	dev_dbg(wdd->parent, "ping  watchdog 0x%08x:0x%08x\n", wdd->timeout, reload);
107
+	hpwdt_ping_ticks(reload);
93
108
 
94
109
 	return 0;
95
110
 }
..
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@@ -162,10 +177,17 @@
162
177
 	if (ilo5 && ulReason == NMI_UNKNOWN && !mynmi)
163
178
 		return NMI_DONE;
164
179
 
165
-	if (ilo5 && !pretimeout)
180
+	if (ilo5 && !pretimeout && !mynmi)
166
181
 		return NMI_DONE;
167
182
 
168
-	hpwdt_stop();
183
+	if (kdumptimeout < 0)
184
+		hpwdt_stop();
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+	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
+	}
169
191
 
170
192
 	hex_byte_pack(panic_msg, mynmi);
171
193
 	nmi_panic(regs, panic_msg);
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@@ -203,11 +225,9 @@
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 	.info		= &ident,
204
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 	.ops		= &hpwdt_ops,
205
227
 	.min_timeout	= 1,
206
-	.max_timeout	= HPWDT_MAX_TIMER,
207
228
 	.timeout	= DEFAULT_MARGIN,
208
-#ifdef CONFIG_HPWDT_NMI_DECODING
209
229
 	.pretimeout	= PRETIMEOUT_SEC,
210
-#endif
230
+	.max_hw_heartbeat_ms	= HPWDT_MAX_TIMER * 1000,
211
231
 };
212
232
 
213
233
 
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@@ -276,12 +296,10 @@
276
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 		return -ENODEV;
277
297
 	}
278
298
 
279
-	/*
280
-	 * Ignore all auxilary iLO devices with the following PCI ID
281
-	 */
282
-	if (dev->subsystem_vendor == PCI_VENDOR_ID_HP &&
283
-	    dev->subsystem_device == 0x1979)
299
+	if (pci_match_id(hpwdt_blacklist, dev)) {
300
+		dev_dbg(&dev->dev, "Not supported on this device\n");
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301
 		return -ENODEV;
302
+	}
285
303
 
286
304
 	if (pci_enable_device(dev)) {
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305
 		dev_warn(&dev->dev,
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@@ -301,28 +319,40 @@
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 	hpwdt_timer_reg = pci_mem_addr + 0x70;
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320
 	hpwdt_timer_con = pci_mem_addr + 0x72;
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321
 
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-	/* Make sure that timer is disabled until /dev/watchdog is opened */
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-	hpwdt_stop();
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+	/* Have the core update running timer until user space is ready */
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+	if (hpwdt_hw_is_running()) {
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+		dev_info(&dev->dev, "timer is running\n");
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+		set_bit(WDOG_HW_RUNNING, &hpwdt_dev.status);
326
+	}
306
327
 
307
328
 	/* Initialize NMI Decoding functionality */
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 	retval = hpwdt_init_nmi_decoding(dev);
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330
 	if (retval != 0)
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331
 		goto error_init_nmi_decoding;
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332
 
333
+	watchdog_stop_on_unregister(&hpwdt_dev);
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334
 	watchdog_set_nowayout(&hpwdt_dev, nowayout);
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-	if (watchdog_init_timeout(&hpwdt_dev, soft_margin, NULL))
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-		dev_warn(&dev->dev, "Invalid soft_margin: %d.\n", soft_margin);
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+	watchdog_init_timeout(&hpwdt_dev, soft_margin, NULL);
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+
337
+	if (pretimeout && hpwdt_dev.timeout <= PRETIMEOUT_SEC) {
338
+		dev_warn(&dev->dev, "timeout <= pretimeout. Setting pretimeout to zero\n");
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+		pretimeout = 0;
340
+	}
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+	hpwdt_dev.pretimeout = pretimeout ? PRETIMEOUT_SEC : 0;
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+	kdumptimeout = min(kdumptimeout, HPWDT_MAX_TIMER);
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343
 
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 	hpwdt_dev.parent = &dev->dev;
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345
 	retval = watchdog_register_device(&hpwdt_dev);
318
-	if (retval < 0) {
319
-		dev_err(&dev->dev, "watchdog register failed: %d.\n", retval);
346
+	if (retval < 0)
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347
 		goto error_wd_register;
321
-	}
322
348
 
323
-	dev_info(&dev->dev, "HPE Watchdog Timer Driver: %s"
324
-			", timer margin: %d seconds (nowayout=%d).\n",
325
-			HPWDT_VERSION, hpwdt_dev.timeout, nowayout);
349
+	dev_info(&dev->dev, "HPE Watchdog Timer Driver: Version: %s\n",
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+				HPWDT_VERSION);
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+	dev_info(&dev->dev, "timeout: %d seconds (nowayout=%d)\n",
352
+				hpwdt_dev.timeout, nowayout);
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+	dev_info(&dev->dev, "pretimeout: %s.\n",
354
+				pretimeout ? "on" : "off");
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+	dev_info(&dev->dev, "kdumptimeout: %d.\n", kdumptimeout);
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356
 
327
357
 	if (dev->subsystem_vendor == PCI_VENDOR_ID_HP_3PAR)
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 		ilo5 = true;
..
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@@ -340,9 +370,6 @@
340
370
 
341
371
 static void hpwdt_exit(struct pci_dev *dev)
342
372
 {
343
-	if (!nowayout)
344
-		hpwdt_stop();
345
-
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373
 	watchdog_unregister_device(&hpwdt_dev);
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 	hpwdt_exit_nmi_decoding();
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 	pci_iounmap(dev, pci_mem_addr);
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..
@@ -364,10 +391,16 @@
364
391
 module_param(soft_margin, int, 0);
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392
 MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
366
393
 
394
+module_param_named(timeout, soft_margin, int, 0);
395
+MODULE_PARM_DESC(timeout, "Alias of soft_margin");
396
+
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397
 module_param(nowayout, bool, 0);
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398
 MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
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399
 		__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
370
400
 
401
+module_param(kdumptimeout, int, 0444);
402
+MODULE_PARM_DESC(kdumptimeout, "Timeout applied for crash kernel transition in seconds");
403
+
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404
 #ifdef CONFIG_HPWDT_NMI_DECODING
372
405
 module_param(pretimeout, bool, 0);
373
406
 MODULE_PARM_DESC(pretimeout, "Watchdog pretimeout enabled");