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>
secure_computing() is called first in syscall_trace_enter() so that a system call will be aborted quickly without doing succeeding syscall tracing if seccomp rules want to deny that system call. TODO: - Update https://github.com/seccomp/libseccomp csky support Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Cc: Arnd Bergmann <arnd@arndb.de>
Put the rseq_syscall check point at the prologue of the syscall will break the a0 ... a7. This will casue system call bug when DEBUG_RSEQ is enabled. So move it to the epilogue of syscall, but before syscall_trace. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
There is no fixup or feature in the patch, we only cleanup with: - Remove unnecessary reg used (r11, r12), just use r9 & r10 & syscallid regs as temp useage. - Add _TIF_SYSCALL_WORK and _TIF_WORK_MASK to gather macros. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Current implementation could destory a4 & a5 when strace, so we need to get them from pt_regs by SAVE_ALL. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
log: [ 0.13373200] Calibrating delay loop... [ 0.14077600] ------------[ cut here ]------------ [ 0.14116700] WARNING: CPU: 0 PID: 0 at kernel/sched/core.c:3790 preempt_count_add+0xc8/0x11c [ 0.14348000] DEBUG_LOCKS_WARN_ON((preempt_count() < 0))Modules linked in: [ 0.14395100] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.6.0 #7 [ 0.14410800] [ 0.14427400] Call Trace: [ 0.14450700] [<807cd226>] dump_stack+0x8a/0xe4 [ 0.14473500] [<80072792>] __warn+0x10e/0x15c [ 0.14495900] [<80072852>] warn_slowpath_fmt+0x72/0xc0 [ 0.14518600] [<800a5240>] preempt_count_add+0xc8/0x11c [ 0.14544900] [<807ef918>] _raw_spin_lock+0x28/0x68 [ 0.14572600] [<800e0eb8>] vprintk_emit+0x84/0x2d8 [ 0.14599000] [<800e113a>] vprintk_default+0x2e/0x44 [ 0.14625100] [<800e2042>] vprintk_func+0x12a/0x1d0 [ 0.14651300] [<800e1804>] printk+0x30/0x48 [ 0.14677600] [<80008052>] lockdep_init+0x12/0xb0 [ 0.14703800] [<80002080>] start_kernel+0x558/0x7f8 [ 0.14730000] [<800052bc>] csky_start+0x58/0x94 [ 0.14756600] irq event stamp: 34 [ 0.14775100] hardirqs last enabled at (33): [<80067370>] ret_from_exception+0x2c/0x72 [ 0.14793700] hardirqs last disabled at (34): [<800e0eae>] vprintk_emit+0x7a/0x2d8 [ 0.14812300] softirqs last enabled at (32): [<800655b0>] __do_softirq+0x578/0x6d8 [ 0.14830800] softirqs last disabled at (25): [<8007b3b8>] irq_exit+0xec/0x128 The preempt_count of reg could be destroyed after csky_do_IRQ without reload from memory. After reference to other architectures (arm64, riscv), we move preempt entry into ret_from_exception and disable irq at the beginning of ret_from_exception instead of RESTORE_ALL. Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Reported-by: Lu Baoquan <lu.baoquan@intellif.com>
All processes' PSR could success from SETUP_MMU, so need set it in INIT_THREAD again. And use a3 instead of r7 in __switch_to for code convention. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Interrupt has been disabled in __schedule() with local_irq_disable() and enabled in finish_task_switch->finish_lock_switch() with local_irq_enabled(), So needn't to disable irq here. Signed-off-by: Liu Yibin <jiulong@linux.alibaba.com> Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
This patch adds support for uprobes on csky architecture. Just like kprobe, it support single-step and simulate instructions. Signed-off-by: Guo Ren <guoren@linux.alibaba.com> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Steven Rostedt (VMware) <rostedt@goodmis.org>
Lockdep is needed by proving the spinlocks and rwlocks. Currently, we only put trace_hardirqs_on/off with csky_irq and ret_from_exception. Signed-off-by: Guo Ren <guoren@linux.alibaba.com>