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>

diff --git a/arch/csky/Kconfig b/arch/csky/Kconfig
index ad98b93..af23873 100644 (file)
--- a/arch/csky/Kconfig
+++ b/arch/csky/Kconfig
@@ -42,6 +42,8 @@ config CSKY
        select HAVE_ARCH_MMAP_RND_BITS
        select HAVE_ARCH_SECCOMP_FILTER
        select HAVE_COPY_THREAD_TLS
+       select HAVE_CONTEXT_TRACKING
+       select HAVE_VIRT_CPU_ACCOUNTING_GEN
        select HAVE_DEBUG_BUGVERBOSE
        select HAVE_DYNAMIC_FTRACE
        select HAVE_DYNAMIC_FTRACE_WITH_REGS

diff --git a/arch/csky/kernel/entry.S b/arch/csky/kernel/entry.S
index efd2e69..5a5cabd 100644 (file)
--- 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