linux_dsm_epyc7002/drivers/watchdog/hpwdt.c

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// 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>
#include <asm/nmi.h>
#define HPWDT_VERSION "2.0.2"
#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);
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 */
};
/*
* 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 && !mynmi)
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,
.pretimeout = PRETIMEOUT_SEC,
};
/*
* Init & Exit
*/
static int hpwdt_init_nmi_decoding(struct pci_dev *dev)
{
watchdog: hpwdt: Remove legacy NMI sourcing. Gen8 and prior Proliant systems supported the "CRU" interface to firmware. This interfaces allows linux to "call back" into firmware to source the cause of an NMI. This feature isn't fully utilized as the actual source of the NMI isn't printed, the driver only indicates that the source couldn't be determined when the call fails. With the advent of Gen9, iCRU replaces the CRU. The call back feature is no longer available in firmware. To be compatible and not attempt to call back into firmware on system not supporting CRU, the SMBIOS table is consulted to determine if it is safe to make the call back or not. This results in about half of the driver code being devoted to either making CRU calls or determing if it is safe to make CRU calls. As noted, the driver isn't really using the results of the CRU calls. Furthermore, as a consequence of the Spectre security issue, the BIOS/EFI calls are being wrapped into Spectre-disabling section. Removing the call back in hpwdt_pretimeout assists in this effort. As the CRU sourcing of the NMI isn't required for handling the NMI and there are security concerns with making the call back, remove the legacy (pre Gen9) NMI sourcing and the DMI code to determine if the system had the CRU interface. Signed-off-by: Jerry Hoemann <jerry.hoemann@hpe.com> Acked-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2018-02-26 10:22:20 +07:00
#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;
watchdog: hpwdt: Remove legacy NMI sourcing. Gen8 and prior Proliant systems supported the "CRU" interface to firmware. This interfaces allows linux to "call back" into firmware to source the cause of an NMI. This feature isn't fully utilized as the actual source of the NMI isn't printed, the driver only indicates that the source couldn't be determined when the call fails. With the advent of Gen9, iCRU replaces the CRU. The call back feature is no longer available in firmware. To be compatible and not attempt to call back into firmware on system not supporting CRU, the SMBIOS table is consulted to determine if it is safe to make the call back or not. This results in about half of the driver code being devoted to either making CRU calls or determing if it is safe to make CRU calls. As noted, the driver isn't really using the results of the CRU calls. Furthermore, as a consequence of the Spectre security issue, the BIOS/EFI calls are being wrapped into Spectre-disabling section. Removing the call back in hpwdt_pretimeout assists in this effort. As the CRU sourcing of the NMI isn't required for handling the NMI and there are security concerns with making the call back, remove the legacy (pre Gen9) NMI sourcing and the DMI code to determine if the system had the CRU interface. Signed-off-by: Jerry Hoemann <jerry.hoemann@hpe.com> Acked-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2018-02-26 10:22:20 +07:00
#endif /* CONFIG_HPWDT_NMI_DECODING */
return 0;
}
static void hpwdt_exit_nmi_decoding(void)
{
watchdog: hpwdt: Remove legacy NMI sourcing. Gen8 and prior Proliant systems supported the "CRU" interface to firmware. This interfaces allows linux to "call back" into firmware to source the cause of an NMI. This feature isn't fully utilized as the actual source of the NMI isn't printed, the driver only indicates that the source couldn't be determined when the call fails. With the advent of Gen9, iCRU replaces the CRU. The call back feature is no longer available in firmware. To be compatible and not attempt to call back into firmware on system not supporting CRU, the SMBIOS table is consulted to determine if it is safe to make the call back or not. This results in about half of the driver code being devoted to either making CRU calls or determing if it is safe to make CRU calls. As noted, the driver isn't really using the results of the CRU calls. Furthermore, as a consequence of the Spectre security issue, the BIOS/EFI calls are being wrapped into Spectre-disabling section. Removing the call back in hpwdt_pretimeout assists in this effort. As the CRU sourcing of the NMI isn't required for handling the NMI and there are security concerns with making the call back, remove the legacy (pre Gen9) NMI sourcing and the DMI code to determine if the system had the CRU interface. Signed-off-by: Jerry Hoemann <jerry.hoemann@hpe.com> Acked-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2018-02-26 10:22:20 +07:00
#ifdef CONFIG_HPWDT_NMI_DECODING
unregister_nmi_handler(NMI_UNKNOWN, "hpwdt");
unregister_nmi_handler(NMI_SERR, "hpwdt");
unregister_nmi_handler(NMI_IO_CHECK, "hpwdt");
watchdog: hpwdt: Remove legacy NMI sourcing. Gen8 and prior Proliant systems supported the "CRU" interface to firmware. This interfaces allows linux to "call back" into firmware to source the cause of an NMI. This feature isn't fully utilized as the actual source of the NMI isn't printed, the driver only indicates that the source couldn't be determined when the call fails. With the advent of Gen9, iCRU replaces the CRU. The call back feature is no longer available in firmware. To be compatible and not attempt to call back into firmware on system not supporting CRU, the SMBIOS table is consulted to determine if it is safe to make the call back or not. This results in about half of the driver code being devoted to either making CRU calls or determing if it is safe to make CRU calls. As noted, the driver isn't really using the results of the CRU calls. Furthermore, as a consequence of the Spectre security issue, the BIOS/EFI calls are being wrapped into Spectre-disabling section. Removing the call back in hpwdt_pretimeout assists in this effort. As the CRU sourcing of the NMI isn't required for handling the NMI and there are security concerns with making the call back, remove the legacy (pre Gen9) NMI sourcing and the DMI code to determine if the system had the CRU interface. Signed-off-by: Jerry Hoemann <jerry.hoemann@hpe.com> Acked-by: Ingo Molnar <mingo@kernel.org> Reviewed-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Guenter Roeck <linux@roeck-us.net> Signed-off-by: Wim Van Sebroeck <wim@iguana.be>
2018-02-26 10:22:20 +07:00
#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;
/* 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_stop_on_unregister(&hpwdt_dev);
watchdog_set_nowayout(&hpwdt_dev, nowayout);
watchdog_init_timeout(&hpwdt_dev, soft_margin, NULL);
if (pretimeout && hpwdt_dev.timeout <= PRETIMEOUT_SEC) {
dev_warn(&dev->dev, "timeout <= pretimeout. Setting pretimeout to zero\n");
pretimeout = 0;
}
hpwdt_dev.pretimeout = pretimeout ? PRETIMEOUT_SEC : 0;
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");
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) ")");
#ifdef CONFIG_HPWDT_NMI_DECODING
module_param(pretimeout, bool, 0);
MODULE_PARM_DESC(pretimeout, "Watchdog pretimeout enabled");
#endif
module_pci_driver(hpwdt_driver);