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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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795d45b22c
After disabling both CONFIG_DEBUG_LOCKING_API_SELFTESTS and netconsole (using current mainline) I get a login prompt, and also... [ 5.181668] SELinux: policy loaded with handle_unknown=deny [ 5.183315] type=1403 audit(1202100038.157:3): policy loaded auid=4294967295 ses=4294967295 [ 5.822073] SELinux: initialized (dev usbfs, type usbfs), uses genfs_contexts [ 7.819146] ------------[ cut here ]------------ [ 7.819146] WARNING: at kernel/lockdep.c:2033 trace_hardirqs_on+0x9b/0x10d() [ 7.819146] Modules linked in: generic ext3 jbd ide_disk ide_core [ 7.819146] Pid: 399, comm: hwclock Not tainted 2.6.24 #4 [ 7.819146] [<c011d140>] warn_on_slowpath+0x41/0x51 [ 7.819146] [<c01364a9>] ? lock_release_holdtime+0x50/0x56 [ 7.819146] [<c013770c>] ? check_usage_forwards+0x19/0x3b [ 7.819146] [<c01390c4>] ? __lock_acquire+0xac3/0xb0b [ 7.819146] [<c0108c98>] ? native_sched_clock+0x8b/0x9f [ 7.819146] [<c01364a9>] ? lock_release_holdtime+0x50/0x56 [ 7.819146] [<c030ca6c>] ? _spin_unlock_irq+0x22/0x42 [ 7.819146] [<c013848b>] trace_hardirqs_on+0x9b/0x10d [ 7.819146] [<c030ca6c>] _spin_unlock_irq+0x22/0x42 [ 7.819146] [<c011481e>] hpet_rtc_interrupt+0xdf/0x290 [ 7.819146] [<c014ea90>] handle_IRQ_event+0x1a/0x46 [ 7.819146] [<c014f8ea>] handle_edge_irq+0xbe/0xff [ 7.819146] [<c0106e08>] do_IRQ+0x6d/0x84 [ 7.819146] [<c0105596>] common_interrupt+0x2e/0x34 [ 7.819146] [<c013007b>] ? ktime_get_ts+0x8/0x3f [ 7.819146] [<c0139420>] ? lock_release+0x167/0x16f [ 7.819146] [<c017974a>] ? core_sys_select+0x2c/0x327 [ 7.819146] [<c0179792>] core_sys_select+0x74/0x327 [ 7.819146] [<c0108c98>] ? native_sched_clock+0x8b/0x9f [ 7.819146] [<c01364a9>] ? lock_release_holdtime+0x50/0x56 [ 7.819146] [<c030ca6c>] ? _spin_unlock_irq+0x22/0x42 [ 7.819146] [<c01384d6>] ? trace_hardirqs_on+0xe6/0x10d [ 7.819146] [<c030ca77>] ? _spin_unlock_irq+0x2d/0x42 [ 7.819146] [<c023b437>] ? rtc_do_ioctl+0x11b/0x677 [ 7.819146] [<c01c487e>] ? inode_has_perm+0x5e/0x68 [ 7.819146] [<c01364a9>] ? lock_release_holdtime+0x50/0x56 [ 7.819146] [<c0108c98>] ? native_sched_clock+0x8b/0x9f [ 7.819146] [<c01c490b>] ? file_has_perm+0x83/0x8c [ 7.819146] [<c023ba08>] ? rtc_ioctl+0xf/0x11 [ 7.819146] [<c017898d>] ? do_ioctl+0x55/0x67 [ 7.819146] [<c0179d15>] sys_select+0x93/0x163 [ 7.819146] [<c0104b39>] ? sysenter_past_esp+0x9a/0xa5 [ 7.819146] [<c0104afe>] sysenter_past_esp+0x5f/0xa5 [ 7.819146] ======================= [ 7.819146] ---[ end trace 96540ca301ffb84c ]--- [ 7.819210] rtc: lost 6 interrupts [ 7.870668] type=1400 audit(1202128840.794:4): avc: denied { audit_write } for pid=399 comm="hwclock" capability=29 scontext=system_u:system_r:hwclock_t:s0 tcontext=system_u:system_r:hwclock_t:s0 tclass=capability [ 9.538866] input: PC Speaker as /class/input/input5 Because hpet_rtc_interrupt()'s call to get_rtc_time() ends up resolving to include/asm-generic/rtc.h's (hilariously inlined) get_rtc_time(), which does spin_unlock_irq() from hard IRQ context. The obvious patch fixes it. Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Ingo Molnar <mingo@elte.hu>
218 lines
5.2 KiB
C
218 lines
5.2 KiB
C
/*
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* include/asm-generic/rtc.h
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*
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* Author: Tom Rini <trini@mvista.com>
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*
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* Based on:
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* drivers/char/rtc.c
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*
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* Please read the COPYING file for all license details.
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*/
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#ifndef __ASM_RTC_H__
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#define __ASM_RTC_H__
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#ifdef __KERNEL__
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#include <linux/mc146818rtc.h>
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#include <linux/rtc.h>
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#include <linux/bcd.h>
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#define RTC_PIE 0x40 /* periodic interrupt enable */
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#define RTC_AIE 0x20 /* alarm interrupt enable */
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#define RTC_UIE 0x10 /* update-finished interrupt enable */
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/* some dummy definitions */
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#define RTC_BATT_BAD 0x100 /* battery bad */
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#define RTC_SQWE 0x08 /* enable square-wave output */
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#define RTC_DM_BINARY 0x04 /* all time/date values are BCD if clear */
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#define RTC_24H 0x02 /* 24 hour mode - else hours bit 7 means pm */
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#define RTC_DST_EN 0x01 /* auto switch DST - works f. USA only */
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/*
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* Returns true if a clock update is in progress
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*/
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static inline unsigned char rtc_is_updating(void)
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{
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unsigned char uip;
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unsigned long flags;
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spin_lock_irqsave(&rtc_lock, flags);
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uip = (CMOS_READ(RTC_FREQ_SELECT) & RTC_UIP);
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spin_unlock_irqrestore(&rtc_lock, flags);
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return uip;
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}
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static inline unsigned int get_rtc_time(struct rtc_time *time)
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{
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unsigned long uip_watchdog = jiffies;
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unsigned char ctrl;
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unsigned long flags;
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#ifdef CONFIG_MACH_DECSTATION
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unsigned int real_year;
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#endif
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/*
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* read RTC once any update in progress is done. The update
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* can take just over 2ms. We wait 10 to 20ms. There is no need to
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* to poll-wait (up to 1s - eeccch) for the falling edge of RTC_UIP.
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* If you need to know *exactly* when a second has started, enable
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* periodic update complete interrupts, (via ioctl) and then
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* immediately read /dev/rtc which will block until you get the IRQ.
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* Once the read clears, read the RTC time (again via ioctl). Easy.
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*/
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if (rtc_is_updating() != 0)
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while (jiffies - uip_watchdog < 2*HZ/100) {
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barrier();
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cpu_relax();
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}
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/*
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* Only the values that we read from the RTC are set. We leave
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* tm_wday, tm_yday and tm_isdst untouched. Even though the
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* RTC has RTC_DAY_OF_WEEK, we ignore it, as it is only updated
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* by the RTC when initially set to a non-zero value.
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*/
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spin_lock_irqsave(&rtc_lock, flags);
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time->tm_sec = CMOS_READ(RTC_SECONDS);
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time->tm_min = CMOS_READ(RTC_MINUTES);
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time->tm_hour = CMOS_READ(RTC_HOURS);
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time->tm_mday = CMOS_READ(RTC_DAY_OF_MONTH);
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time->tm_mon = CMOS_READ(RTC_MONTH);
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time->tm_year = CMOS_READ(RTC_YEAR);
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#ifdef CONFIG_MACH_DECSTATION
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real_year = CMOS_READ(RTC_DEC_YEAR);
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#endif
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ctrl = CMOS_READ(RTC_CONTROL);
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spin_unlock_irqrestore(&rtc_lock, flags);
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if (!(ctrl & RTC_DM_BINARY) || RTC_ALWAYS_BCD)
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{
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BCD_TO_BIN(time->tm_sec);
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BCD_TO_BIN(time->tm_min);
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BCD_TO_BIN(time->tm_hour);
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BCD_TO_BIN(time->tm_mday);
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BCD_TO_BIN(time->tm_mon);
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BCD_TO_BIN(time->tm_year);
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}
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#ifdef CONFIG_MACH_DECSTATION
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time->tm_year += real_year - 72;
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#endif
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/*
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* Account for differences between how the RTC uses the values
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* and how they are defined in a struct rtc_time;
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*/
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if (time->tm_year <= 69)
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time->tm_year += 100;
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time->tm_mon--;
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return RTC_24H;
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}
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/* Set the current date and time in the real time clock. */
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static inline int set_rtc_time(struct rtc_time *time)
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{
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unsigned long flags;
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unsigned char mon, day, hrs, min, sec;
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unsigned char save_control, save_freq_select;
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unsigned int yrs;
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#ifdef CONFIG_MACH_DECSTATION
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unsigned int real_yrs, leap_yr;
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#endif
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yrs = time->tm_year;
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mon = time->tm_mon + 1; /* tm_mon starts at zero */
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day = time->tm_mday;
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hrs = time->tm_hour;
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min = time->tm_min;
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sec = time->tm_sec;
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if (yrs > 255) /* They are unsigned */
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return -EINVAL;
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spin_lock_irqsave(&rtc_lock, flags);
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#ifdef CONFIG_MACH_DECSTATION
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real_yrs = yrs;
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leap_yr = ((!((yrs + 1900) % 4) && ((yrs + 1900) % 100)) ||
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!((yrs + 1900) % 400));
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yrs = 72;
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/*
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* We want to keep the year set to 73 until March
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* for non-leap years, so that Feb, 29th is handled
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* correctly.
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*/
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if (!leap_yr && mon < 3) {
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real_yrs--;
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yrs = 73;
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}
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#endif
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/* These limits and adjustments are independent of
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* whether the chip is in binary mode or not.
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*/
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if (yrs > 169) {
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spin_unlock_irqrestore(&rtc_lock, flags);
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return -EINVAL;
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}
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if (yrs >= 100)
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yrs -= 100;
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if (!(CMOS_READ(RTC_CONTROL) & RTC_DM_BINARY)
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|| RTC_ALWAYS_BCD) {
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BIN_TO_BCD(sec);
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BIN_TO_BCD(min);
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BIN_TO_BCD(hrs);
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BIN_TO_BCD(day);
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BIN_TO_BCD(mon);
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BIN_TO_BCD(yrs);
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}
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save_control = CMOS_READ(RTC_CONTROL);
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CMOS_WRITE((save_control|RTC_SET), RTC_CONTROL);
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save_freq_select = CMOS_READ(RTC_FREQ_SELECT);
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CMOS_WRITE((save_freq_select|RTC_DIV_RESET2), RTC_FREQ_SELECT);
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#ifdef CONFIG_MACH_DECSTATION
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CMOS_WRITE(real_yrs, RTC_DEC_YEAR);
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#endif
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CMOS_WRITE(yrs, RTC_YEAR);
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CMOS_WRITE(mon, RTC_MONTH);
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CMOS_WRITE(day, RTC_DAY_OF_MONTH);
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CMOS_WRITE(hrs, RTC_HOURS);
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CMOS_WRITE(min, RTC_MINUTES);
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CMOS_WRITE(sec, RTC_SECONDS);
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CMOS_WRITE(save_control, RTC_CONTROL);
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CMOS_WRITE(save_freq_select, RTC_FREQ_SELECT);
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spin_unlock_irqrestore(&rtc_lock, flags);
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return 0;
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}
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static inline unsigned int get_rtc_ss(void)
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{
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struct rtc_time h;
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get_rtc_time(&h);
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return h.tm_sec;
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}
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static inline int get_rtc_pll(struct rtc_pll_info *pll)
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{
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return -EINVAL;
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}
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static inline int set_rtc_pll(struct rtc_pll_info *pll)
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{
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return -EINVAL;
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}
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#endif /* __KERNEL__ */
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#endif /* __ASM_RTC_H__ */
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