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-rw-r--r--drivers/watchdog/hpwdt.c418
1 files changed, 418 insertions, 0 deletions
diff --git a/drivers/watchdog/hpwdt.c b/drivers/watchdog/hpwdt.c
new file mode 100644
index 000000000..79ed1626d
--- /dev/null
+++ b/drivers/watchdog/hpwdt.c
@@ -0,0 +1,418 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * 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>
+ */
+
+#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>
+#ifdef CONFIG_HPWDT_NMI_DECODING
+#include <asm/nmi.h>
+#endif
+#include <linux/crash_dump.h>
+
+#define HPWDT_VERSION "2.0.4"
+#define SECS_TO_TICKS(secs) ((secs) * 1000 / 128)
+#define TICKS_TO_SECS(ticks) ((ticks) * 128 / 1000)
+#define HPWDT_MAX_TICKS 65535
+#define HPWDT_MAX_TIMER TICKS_TO_SECS(HPWDT_MAX_TICKS)
+#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 int kdumptimeout = -1;
+
+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 */
+ { PCI_DEVICE(PCI_VENDOR_ID_HP_3PAR, 0x0389) }, /* PCtrl */
+ {0}, /* terminate list */
+};
+MODULE_DEVICE_TABLE(pci, hpwdt_devices);
+
+static const struct pci_device_id hpwdt_blacklist[] = {
+ { PCI_DEVICE_SUB(PCI_VENDOR_ID_HP, 0x3306, PCI_VENDOR_ID_HP, 0x1979) }, /* auxilary iLO */
+ { PCI_DEVICE_SUB(PCI_VENDOR_ID_HP, 0x3306, PCI_VENDOR_ID_HP_3PAR, 0x0289) }, /* CL */
+ {0}, /* terminate list */
+};
+
+static struct watchdog_device hpwdt_dev;
+/*
+ * Watchdog operations
+ */
+static int hpwdt_hw_is_running(void)
+{
+ return ioread8(hpwdt_timer_con) & 0x01;
+}
+
+static int hpwdt_start(struct watchdog_device *wdd)
+{
+ int control = 0x81 | (pretimeout ? 0x4 : 0);
+ int reload = SECS_TO_TICKS(min(wdd->timeout, wdd->max_hw_heartbeat_ms/1000));
+
+ dev_dbg(wdd->parent, "start watchdog 0x%08x:0x%08x:0x%02x\n", wdd->timeout, 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 void hpwdt_ping_ticks(int val)
+{
+ val = min(val, HPWDT_MAX_TICKS);
+ iowrite16(val, hpwdt_timer_reg);
+}
+
+static int hpwdt_ping(struct watchdog_device *wdd)
+{
+ int reload = SECS_TO_TICKS(min(wdd->timeout, wdd->max_hw_heartbeat_ms/1000));
+
+ dev_dbg(wdd->parent, "ping watchdog 0x%08x:0x%08x\n", wdd->timeout, reload);
+ hpwdt_ping_ticks(reload);
+
+ 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 = false;
+ 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 (ulReason == NMI_UNKNOWN && !mynmi)
+ return NMI_DONE;
+
+ if (ilo5 && !pretimeout && !mynmi)
+ return NMI_DONE;
+
+ if (kdumptimeout < 0)
+ hpwdt_stop();
+ else if (kdumptimeout == 0)
+ ;
+ else {
+ unsigned int val = max((unsigned int)kdumptimeout, hpwdt_dev.timeout);
+ hpwdt_ping_ticks(SECS_TO_TICKS(val));
+ }
+
+ 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,
+ .timeout = DEFAULT_MARGIN,
+ .pretimeout = PRETIMEOUT_SEC,
+ .max_hw_heartbeat_ms = HPWDT_MAX_TIMER * 1000,
+};
+
+
+/*
+ * 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;
+ }
+
+ if (pci_match_id(hpwdt_blacklist, dev)) {
+ dev_dbg(&dev->dev, "Not supported on this device\n");
+ 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;
+
+ /* Have the core update running timer until user space is ready */
+ if (hpwdt_hw_is_running()) {
+ dev_info(&dev->dev, "timer is running\n");
+ set_bit(WDOG_HW_RUNNING, &hpwdt_dev.status);
+ }
+
+ /* Initialize NMI Decoding functionality */
+ retval = hpwdt_init_nmi_decoding(dev);
+ if (retval != 0)
+ goto error_init_nmi_decoding;
+
+ watchdog_stop_on_unregister(&hpwdt_dev);
+ watchdog_set_nowayout(&hpwdt_dev, nowayout);
+ watchdog_init_timeout(&hpwdt_dev, soft_margin, NULL);
+
+ if (is_kdump_kernel()) {
+ pretimeout = false;
+ kdumptimeout = 0;
+ }
+
+ if (pretimeout && hpwdt_dev.timeout <= PRETIMEOUT_SEC) {
+ dev_warn(&dev->dev, "timeout <= pretimeout. Setting pretimeout to zero\n");
+ pretimeout = false;
+ }
+ hpwdt_dev.pretimeout = pretimeout ? PRETIMEOUT_SEC : 0;
+ kdumptimeout = min(kdumptimeout, HPWDT_MAX_TIMER);
+
+ hpwdt_dev.parent = &dev->dev;
+ retval = watchdog_register_device(&hpwdt_dev);
+ if (retval < 0)
+ goto error_wd_register;
+
+ dev_info(&dev->dev, "HPE Watchdog Timer Driver: Version: %s\n",
+ HPWDT_VERSION);
+ dev_info(&dev->dev, "timeout: %d seconds (nowayout=%d)\n",
+ hpwdt_dev.timeout, nowayout);
+ dev_info(&dev->dev, "pretimeout: %s.\n",
+ pretimeout ? "on" : "off");
+ dev_info(&dev->dev, "kdumptimeout: %d.\n", kdumptimeout);
+
+ 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)
+{
+ 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_named(timeout, soft_margin, int, 0);
+MODULE_PARM_DESC(timeout, "Alias of soft_margin");
+
+module_param(nowayout, bool, 0);
+MODULE_PARM_DESC(nowayout, "Watchdog cannot be stopped once started (default="
+ __MODULE_STRING(WATCHDOG_NOWAYOUT) ")");
+
+module_param(kdumptimeout, int, 0444);
+MODULE_PARM_DESC(kdumptimeout, "Timeout applied for crash kernel transition in seconds");
+
+#ifdef CONFIG_HPWDT_NMI_DECODING
+module_param(pretimeout, bool, 0);
+MODULE_PARM_DESC(pretimeout, "Watchdog pretimeout enabled");
+#endif
+
+module_pci_driver(hpwdt_driver);
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