Adding upstream version 4.19.249.upstream/4.19.249

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 376 insertions, 0 deletions

diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
new file mode 100644
index 000000000..9dc62a461
--- /dev/null
+++ b/drivers/watchdog/hpwdt.c
@@ -0,0 +1,376 @@
+/*
+ *	HPE WatchDog Driver
+ *	based on
+ *
+ *	SoftDog	0.05:	A Software Watchdog Device
+ *
+ *	(c) Copyright 2018 Hewlett Packard Enterprise Development LP
+ *	Thomas Mingarelli <thomas.mingarelli@hpe.com>
+ *
+ *	This program is free software; you can redistribute it and/or
+ *	modify it under the terms of the GNU General Public License
+ *	version 2 as published by the Free Software Foundation
+ *
+ */
+
+#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
+
+#include <linux/device.h>
+#include <linux/io.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/moduleparam.h>
+#include <linux/pci.h>
+#include <linux/pci_ids.h>
+#include <linux/types.h>
+#include <linux/watchdog.h>
+#include <asm/nmi.h>
+
+#define HPWDT_VERSION			"2.0.0"
+#define SECS_TO_TICKS(secs)		((secs) * 1000 / 128)
+#define TICKS_TO_SECS(ticks)		((ticks) * 128 / 1000)
+#define HPWDT_MAX_TIMER			TICKS_TO_SECS(65535)
+#define DEFAULT_MARGIN			30
+#define PRETIMEOUT_SEC			9
+
+static bool ilo5;
+static unsigned int soft_margin = DEFAULT_MARGIN;	/* in seconds */
+static bool nowayout = WATCHDOG_NOWAYOUT;
+static bool pretimeout = IS_ENABLED(CONFIG_HPWDT_NMI_DECODING);
+
+static void __iomem *pci_mem_addr;		/* the PCI-memory address */
+static unsigned long __iomem *hpwdt_nmistat;
+static unsigned long __iomem *hpwdt_timer_reg;
+static unsigned long __iomem *hpwdt_timer_con;
+
+static const struct pci_device_id hpwdt_devices[] = {
+	{ PCI_DEVICE(PCI_VENDOR_ID_COMPAQ, 0xB203) },	/* iLO2 */
+	{ PCI_DEVICE(PCI_VENDOR_ID_HP, 0x3306) },	/* iLO3 */
+	{0},			/* terminate list */
+};
+MODULE_DEVICE_TABLE(pci, hpwdt_devices);
+
+
+/*
+ *	Watchdog operations
+ */
+static int hpwdt_start(struct watchdog_device *wdd)
+{
+	int control = 0x81 | (pretimeout ? 0x4 : 0);
+	int reload = SECS_TO_TICKS(wdd->timeout);
+
+	dev_dbg(wdd->parent, "start watchdog 0x%08x:0x%02x\n", reload, control);
+	iowrite16(reload, hpwdt_timer_reg);
+	iowrite8(control, hpwdt_timer_con);
+
+	return 0;
+}
+
+static void hpwdt_stop(void)
+{
+	unsigned long data;
+
+	pr_debug("stop  watchdog\n");
+
+	data = ioread8(hpwdt_timer_con);
+	data &= 0xFE;
+	iowrite8(data, hpwdt_timer_con);
+}
+
+static int hpwdt_stop_core(struct watchdog_device *wdd)
+{
+	hpwdt_stop();
+
+	return 0;
+}
+
+static int hpwdt_ping(struct watchdog_device *wdd)
+{
+	int reload = SECS_TO_TICKS(wdd->timeout);
+
+	dev_dbg(wdd->parent, "ping  watchdog 0x%08x\n", reload);
+	iowrite16(reload, hpwdt_timer_reg);
+
+	return 0;
+}
+
+static unsigned int hpwdt_gettimeleft(struct watchdog_device *wdd)
+{
+	return TICKS_TO_SECS(ioread16(hpwdt_timer_reg));
+}
+
+static int hpwdt_settimeout(struct watchdog_device *wdd, unsigned int val)
+{
+	dev_dbg(wdd->parent, "set_timeout = %d\n", val);
+
+	wdd->timeout = val;
+	if (val <= wdd->pretimeout) {
+		dev_dbg(wdd->parent, "pretimeout < timeout. Setting to zero\n");
+		wdd->pretimeout = 0;
+		pretimeout = 0;
+		if (watchdog_active(wdd))
+			hpwdt_start(wdd);
+	}
+	hpwdt_ping(wdd);
+
+	return 0;
+}
+
+#ifdef CONFIG_HPWDT_NMI_DECODING
+static int hpwdt_set_pretimeout(struct watchdog_device *wdd, unsigned int req)
+{
+	unsigned int val = 0;
+
+	dev_dbg(wdd->parent, "set_pretimeout = %d\n", req);
+	if (req) {
+		val = PRETIMEOUT_SEC;
+		if (val >= wdd->timeout)
+			return -EINVAL;
+	}
+
+	if (val != req)
+		dev_dbg(wdd->parent, "Rounding pretimeout to: %d\n", val);
+
+	wdd->pretimeout = val;
+	pretimeout = !!val;
+
+	if (watchdog_active(wdd))
+		hpwdt_start(wdd);
+
+	return 0;
+}
+
+static int hpwdt_my_nmi(void)
+{
+	return ioread8(hpwdt_nmistat) & 0x6;
+}
+
+/*
+ *	NMI Handler
+ */
+static int hpwdt_pretimeout(unsigned int ulReason, struct pt_regs *regs)
+{
+	unsigned int mynmi = hpwdt_my_nmi();
+	static char panic_msg[] =
+		"00: An NMI occurred. Depending on your system the reason "
+		"for the NMI is logged in any one of the following resources:\n"
+		"1. Integrated Management Log (IML)\n"
+		"2. OA Syslog\n"
+		"3. OA Forward Progress Log\n"
+		"4. iLO Event Log";
+
+	if (ilo5 && ulReason == NMI_UNKNOWN && !mynmi)
+		return NMI_DONE;
+
+	if (ilo5 && !pretimeout)
+		return NMI_DONE;
+
+	hpwdt_stop();
+
+	hex_byte_pack(panic_msg, mynmi);
+	nmi_panic(regs, panic_msg);
+
+	return NMI_HANDLED;
+}
+#endif /* CONFIG_HPWDT_NMI_DECODING */
+
+
+static const struct watchdog_info ident = {
+	.options = WDIOF_PRETIMEOUT    |
+		   WDIOF_SETTIMEOUT    |
+		   WDIOF_KEEPALIVEPING |
+		   WDIOF_MAGICCLOSE,
+	.identity = "HPE iLO2+ HW Watchdog Timer",
+};
+
+/*
+ *	Kernel interfaces
+ */
+
+static const struct watchdog_ops hpwdt_ops = {
+	.owner		= THIS_MODULE,
+	.start		= hpwdt_start,
+	.stop		= hpwdt_stop_core,
+	.ping		= hpwdt_ping,
+	.set_timeout	= hpwdt_settimeout,
+	.get_timeleft	= hpwdt_gettimeleft,
+#ifdef CONFIG_HPWDT_NMI_DECODING
+	.set_pretimeout	= hpwdt_set_pretimeout,
+#endif
+};
+
+static struct watchdog_device hpwdt_dev = {
+	.info		= &ident,
+	.ops		= &hpwdt_ops,
+	.min_timeout	= 1,
+	.max_timeout	= HPWDT_MAX_TIMER,
+	.timeout	= DEFAULT_MARGIN,
+#ifdef CONFIG_HPWDT_NMI_DECODING
+	.pretimeout	= PRETIMEOUT_SEC,
+#endif
+};
+
+
+/*
+ *	Init & Exit
+ */
+
+static int hpwdt_init_nmi_decoding(struct pci_dev *dev)
+{
+#ifdef CONFIG_HPWDT_NMI_DECODING
+	int retval;
+	/*
+	 * Only one function can register for NMI_UNKNOWN
+	 */
+	retval = register_nmi_handler(NMI_UNKNOWN, hpwdt_pretimeout, 0, "hpwdt");
+	if (retval)
+		goto error;
+	retval = register_nmi_handler(NMI_SERR, hpwdt_pretimeout, 0, "hpwdt");
+	if (retval)
+		goto error1;
+	retval = register_nmi_handler(NMI_IO_CHECK, hpwdt_pretimeout, 0, "hpwdt");
+	if (retval)
+		goto error2;
+
+	dev_info(&dev->dev,
+		"HPE Watchdog Timer Driver: NMI decoding initialized\n");
+
+	return 0;
+
+error2:
+	unregister_nmi_handler(NMI_SERR, "hpwdt");
+error1:
+	unregister_nmi_handler(NMI_UNKNOWN, "hpwdt");
+error:
+	dev_warn(&dev->dev,
+		"Unable to register a die notifier (err=%d).\n",
+		retval);
+	return retval;
+#endif	/* CONFIG_HPWDT_NMI_DECODING */
+	return 0;
+}
+
+static void hpwdt_exit_nmi_decoding(void)
+{
+#ifdef CONFIG_HPWDT_NMI_DECODING
+	unregister_nmi_handler(NMI_UNKNOWN, "hpwdt");
+	unregister_nmi_handler(NMI_SERR, "hpwdt");
+	unregister_nmi_handler(NMI_IO_CHECK, "hpwdt");
+#endif
+}
+
+static int hpwdt_init_one(struct pci_dev *dev,
+					const struct pci_device_id *ent)
+{
+	int retval;
+
+	/*
+	 * First let's find out if we are on an iLO2+ server. We will
+	 * not run on a legacy ASM box.
+	 * So we only support the G5 ProLiant servers and higher.
+	 */
+	if (dev->subsystem_vendor != PCI_VENDOR_ID_HP &&
+	    dev->subsystem_vendor != PCI_VENDOR_ID_HP_3PAR) {
+		dev_warn(&dev->dev,
+			"This server does not have an iLO2+ ASIC.\n");
+		return -ENODEV;
+	}
+
+	/*
+	 * Ignore all auxilary iLO devices with the following PCI ID
+	 */
+	if (dev->subsystem_vendor == PCI_VENDOR_ID_HP &&
+	    dev->subsystem_device == 0x1979)
+		return -ENODEV;
+
+	if (pci_enable_device(dev)) {
+		dev_warn(&dev->dev,
+			"Not possible to enable PCI Device: 0x%x:0x%x.\n",
+			ent->vendor, ent->device);
+		return -ENODEV;
+	}
+
+	pci_mem_addr = pci_iomap(dev, 1, 0x80);
+	if (!pci_mem_addr) {
+		dev_warn(&dev->dev,
+			"Unable to detect the iLO2+ server memory.\n");
+		retval = -ENOMEM;
+		goto error_pci_iomap;
+	}
+	hpwdt_nmistat	= pci_mem_addr + 0x6e;
+	hpwdt_timer_reg = pci_mem_addr + 0x70;
+	hpwdt_timer_con = pci_mem_addr + 0x72;
+
+	/* Make sure that timer is disabled until /dev/watchdog is opened */
+	hpwdt_stop();
+
+	/* Initialize NMI Decoding functionality */
+	retval = hpwdt_init_nmi_decoding(dev);
+	if (retval != 0)
+		goto error_init_nmi_decoding;
+
+	watchdog_set_nowayout(&hpwdt_dev, nowayout);
+	if (watchdog_init_timeout(&hpwdt_dev, soft_margin, NULL))
+		dev_warn(&dev->dev, "Invalid soft_margin: %d.\n", soft_margin);
+
+	hpwdt_dev.parent = &dev->dev;
+	retval = watchdog_register_device(&hpwdt_dev);
+	if (retval < 0) {
+		dev_err(&dev->dev, "watchdog register failed: %d.\n", retval);
+		goto error_wd_register;
+	}
+
+	dev_info(&dev->dev, "HPE Watchdog Timer Driver: %s"
+			", timer margin: %d seconds (nowayout=%d).\n",
+			HPWDT_VERSION, hpwdt_dev.timeout, nowayout);
+
+	if (dev->subsystem_vendor == PCI_VENDOR_ID_HP_3PAR)
+		ilo5 = true;
+
+	return 0;
+
+error_wd_register:
+	hpwdt_exit_nmi_decoding();
+error_init_nmi_decoding:
+	pci_iounmap(dev, pci_mem_addr);
+error_pci_iomap:
+	pci_disable_device(dev);
+	return retval;
+}
+
+static void hpwdt_exit(struct pci_dev *dev)
+{
+	if (!nowayout)
+		hpwdt_stop();
+
+	watchdog_unregister_device(&hpwdt_dev);
+	hpwdt_exit_nmi_decoding();
+	pci_iounmap(dev, pci_mem_addr);
+	pci_disable_device(dev);
+}
+
+static struct pci_driver hpwdt_driver = {
+	.name = "hpwdt",
+	.id_table = hpwdt_devices,
+	.probe = hpwdt_init_one,
+	.remove = hpwdt_exit,
+};
+
+MODULE_AUTHOR("Tom Mingarelli");
+MODULE_DESCRIPTION("hpe watchdog driver");
+MODULE_LICENSE("GPL");
+MODULE_VERSION(HPWDT_VERSION);
+
+module_param(soft_margin, int, 0);
+MODULE_PARM_DESC(soft_margin, "Watchdog timeout in seconds");
+
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
+		__MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+#ifdef CONFIG_HPWDT_NMI_DECODING
+module_param(pretimeout, bool, 0);
+MODULE_PARM_DESC(pretimeout, "Watchdog pretimeout enabled");
+#endif
+
+module_pci_driver(hpwdt_driver);