diff options
Diffstat (limited to 'drivers/watchdog/diag288_wdt.c')
| -rw-r--r-- | drivers/watchdog/diag288_wdt.c | 60 |
1 files changed, 7 insertions, 53 deletions
diff --git a/drivers/watchdog/diag288_wdt.c b/drivers/watchdog/diag288_wdt.c index 4631d0a3866a..887d5a6c155b 100644 --- a/drivers/watchdog/diag288_wdt.c +++ b/drivers/watchdog/diag288_wdt.c @@ -27,27 +27,15 @@ #include <linux/moduleparam.h> #include <linux/slab.h> #include <linux/watchdog.h> +#include <asm/machine.h> #include <asm/ebcdic.h> +#include <asm/diag288.h> #include <asm/diag.h> #include <linux/io.h> #define MAX_CMDLEN 240 #define DEFAULT_CMD "SYSTEM RESTART" -#define MIN_INTERVAL 15 /* Minimal time supported by diag88 */ -#define MAX_INTERVAL 3600 /* One hour should be enough - pure estimation */ - -#define WDT_DEFAULT_TIMEOUT 30 - -/* Function codes - init, change, cancel */ -#define WDT_FUNC_INIT 0 -#define WDT_FUNC_CHANGE 1 -#define WDT_FUNC_CANCEL 2 -#define WDT_FUNC_CONCEAL 0x80000000 - -/* Action codes for LPAR watchdog */ -#define LPARWDT_RESTART 0 - static char wdt_cmd[MAX_CMDLEN] = DEFAULT_CMD; static bool conceal_on; static bool nowayout_info = WATCHDOG_NOWAYOUT; @@ -74,22 +62,8 @@ static char *cmd_buf; static int diag288(unsigned int func, unsigned int timeout, unsigned long action, unsigned int len) { - union register_pair r1 = { .even = func, .odd = timeout, }; - union register_pair r3 = { .even = action, .odd = len, }; - int err; - diag_stat_inc(DIAG_STAT_X288); - - err = -EINVAL; - asm volatile( - " diag %[r1],%[r3],0x288\n" - "0: la %[err],0\n" - "1:\n" - EX_TABLE(0b, 1b) - : [err] "+d" (err) - : [r1] "d" (r1.pair), [r3] "d" (r3.pair) - : "cc", "memory"); - return err; + return __diag288(func, timeout, action, len); } static int diag288_str(unsigned int func, unsigned int timeout, char *cmd) @@ -110,7 +84,7 @@ static int wdt_start(struct watchdog_device *dev) int ret; unsigned int func; - if (MACHINE_IS_VM) { + if (machine_is_vm()) { func = conceal_on ? (WDT_FUNC_INIT | WDT_FUNC_CONCEAL) : WDT_FUNC_INIT; ret = diag288_str(func, dev->timeout, wdt_cmd); @@ -136,7 +110,7 @@ static int wdt_ping(struct watchdog_device *dev) int ret; unsigned int func; - if (MACHINE_IS_VM) { + if (machine_is_vm()) { /* * It seems to be ok to z/VM to use the init function to * retrigger the watchdog. On LPAR WDT_FUNC_CHANGE must @@ -188,34 +162,14 @@ static struct watchdog_device wdt_dev = { static int __init diag288_init(void) { - int ret; - watchdog_set_nowayout(&wdt_dev, nowayout_info); - if (MACHINE_IS_VM) { + if (machine_is_vm()) { cmd_buf = kmalloc(MAX_CMDLEN, GFP_KERNEL); if (!cmd_buf) { pr_err("The watchdog cannot be initialized\n"); return -ENOMEM; } - - ret = diag288_str(WDT_FUNC_INIT, MIN_INTERVAL, "BEGIN"); - if (ret != 0) { - pr_err("The watchdog cannot be initialized\n"); - kfree(cmd_buf); - return -EINVAL; - } - } else { - if (diag288(WDT_FUNC_INIT, WDT_DEFAULT_TIMEOUT, - LPARWDT_RESTART, 0)) { - pr_err("The watchdog cannot be initialized\n"); - return -EINVAL; - } - } - - if (diag288(WDT_FUNC_CANCEL, 0, 0, 0)) { - pr_err("The watchdog cannot be deactivated\n"); - return -EINVAL; } return watchdog_register_device(&wdt_dev); @@ -227,5 +181,5 @@ static void __exit diag288_exit(void) kfree(cmd_buf); } -module_init(diag288_init); +module_cpu_feature_match(S390_CPU_FEATURE_D288, diag288_init); module_exit(diag288_exit); |