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| author | Guo Ren <guoren@linux.alibaba.com> | 2020-07-31 09:13:51 +0000 |
|---|---|---|
| committer | Guo Ren <guoren@linux.alibaba.com> | 2020-08-01 08:17:51 +0000 |
| commit | bdcd93ef9afb42a6051e472fa62c693b1f9edbd8 (patch) | |
| tree | 58fcd5141c136757f1ee99628a8cbad5427c1d51 /arch/csky/kernel/entry.S | |
| parent | e6169c4b4413f97cc36ceebc8dd6d2518f341d0f (diff) | |
| download | lwn-bdcd93ef9afb42a6051e472fa62c693b1f9edbd8.tar.gz lwn-bdcd93ef9afb42a6051e472fa62c693b1f9edbd8.zip | |
csky: Add context tracking support
This patch support context tracking with no hz full.
Here is the test result with dynticks-testing (see tick_stop):
cat /sys/kernel/debug/tracing/per_cpu/cpu0/trace
tracer: nop
entries-in-buffer/entries-written: 356/356 #P:1
_-----=> irqs-off
/ _----=> need-resched
| / _---=> hardirq/softirq
|| / _--=> preempt-depth
||| / delay
TASK-PID CPU# |||| TIMESTAMP FUNCTION
| | | |||| | |
...
sleep-192 [000] d.h. 167.088270: hrtimer_expire_entry: hrtimer=(ptrval) function=tick_sched_timer now=166436355700
sleep-192 [000] d.h. 167.092279: hrtimer_expire_entry: hrtimer=(ptrval) function=tick_sched_timer now=166440365700
<idle>-0 [000] d.h2 167.096492: hrtimer_expire_entry: hrtimer=(ptrval) function=tick_sched_timer now=166444578400
<idle>-0 [000] d..1 167.097876: tick_stop: success=1 dependency=NONE
^^^^^^^^^
<idle>-0 [000] d.h1 168.818206: hrtimer_expire_entry: hrtimer=(ptrval) function=tick_sched_timer now=168166280900
kworker/u2:0-7 [000] .... 168.821760: workqueue_execute_start: work struct (ptrval): function wb_workfn
kworker/u2:0-7 [000] d.h1 168.824464: hrtimer_expire_entry: hrtimer=(ptrval) function=tick_sched_timer now=168172547100
kworker/0:1-18 [000] .... 168.825053: workqueue_execute_start: work struct (ptrval): function vmstat_update
kworker/0:1-18 [000] .... 168.825238: workqueue_execute_start: work struct (ptrval): function vmstat_shepherd
kworker/0:1-18 [000] .... 168.825516: workqueue_execute_start: work struct (ptrval): function neigh_periodic_work
<idle>-0 [000] d..1 168.826121: tick_stop: success=1 dependency=NONE
kworker/u2:0-7 [000] .... 169.377327: workqueue_execute_start: work struct (ptrval): function flush_to_ldisc
<idle>-0 [000] d..1 169.379832: tick_stop: success=1 dependency=NONE
kworker/u2:0-7 [000] .... 169.607935: workqueue_execute_start: work struct (ptrval): function flush_to_ldisc
kworker/u2:0-7 [000] d.h1 169.608148: hrtimer_expire_entry: hrtimer=(ptrval) function=tick_sched_timer now=168956235500
<idle>-0 [000] d..1 169.608654: tick_stop: success=1 dependency=NONE
Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Cc: Greentime Hu <greentime.hu@sifive.com>
Cc: Arnd Bergmann <arnd@arndb.de>
Diffstat (limited to 'arch/csky/kernel/entry.S')
| -rw-r--r-- | arch/csky/kernel/entry.S | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/arch/csky/kernel/entry.S b/arch/csky/kernel/entry.S index efd2e696e3cd..5a5cabd076e1 100644 --- a/arch/csky/kernel/entry.S +++ b/arch/csky/kernel/entry.S @@ -23,6 +23,24 @@ #endif .endm +.macro context_tracking +#ifdef CONFIG_CONTEXT_TRACKING + mfcr a0, epsr + btsti a0, 31 + bt 1f + jbsr context_tracking_user_exit + ldw a0, (sp, LSAVE_A0) + ldw a1, (sp, LSAVE_A1) + ldw a2, (sp, LSAVE_A2) + ldw a3, (sp, LSAVE_A3) +#if defined(__CSKYABIV1__) + ldw r6, (sp, LSAVE_A4) + ldw r7, (sp, LSAVE_A5) +#endif +1: +#endif +.endm + .macro tlbop_begin name, val0, val1, val2 ENTRY(csky_\name) mtcr a3, ss2 @@ -103,6 +121,7 @@ ENTRY(csky_\name) .endm .macro tlbop_end is_write zero_fp + context_tracking RD_MEH a2 psrset ee, ie mov a0, sp @@ -128,6 +147,7 @@ tlbop_end 1 ENTRY(csky_systemcall) SAVE_ALL TRAP0_SIZE zero_fp + context_tracking psrset ee, ie lrw r9, __NR_syscalls @@ -237,6 +257,9 @@ ret_from_exception: and r10, r9 cmpnei r10, 0 bt exit_work +#ifdef CONFIG_CONTEXT_TRACKING + jbsr context_tracking_user_enter +#endif 1: #ifdef CONFIG_PREEMPTION mov r9, sp @@ -277,6 +300,7 @@ work_resched: ENTRY(csky_trap) SAVE_ALL 0 zero_fp + context_tracking psrset ee mov a0, sp /* Push Stack pointer arg */ jbsr trap_c /* Call C-level trap handler */ @@ -311,6 +335,7 @@ ENTRY(csky_get_tls) ENTRY(csky_irq) SAVE_ALL 0 zero_fp + context_tracking psrset ee #ifdef CONFIG_TRACE_IRQFLAGS |