diff options
author | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-03 11:56:24 -0800 |
---|---|---|
committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-01-03 11:56:24 -0800 |
commit | 61420f59a589c0668f70cbe725785837c78ece90 (patch) | |
tree | 79ae77d731cd2425677b9527d50079d8cf34c3b2 /arch/s390 | |
parent | d97106ab53f812910a62d18afb9dbe882819c1ba (diff) | |
parent | c742b31c03f37c5c499178f09f57381aa6c70131 (diff) |
Merge branch 'cputime' of git://git390.osdl.marist.edu/pub/scm/linux-2.6
* 'cputime' of git://git390.osdl.marist.edu/pub/scm/linux-2.6:
[PATCH] fast vdso implementation for CLOCK_THREAD_CPUTIME_ID
[PATCH] improve idle cputime accounting
[PATCH] improve precision of idle time detection.
[PATCH] improve precision of process accounting.
[PATCH] idle cputime accounting
[PATCH] fix scaled & unscaled cputime accounting
Diffstat (limited to 'arch/s390')
-rw-r--r-- | arch/s390/include/asm/cpu.h | 7 | ||||
-rw-r--r-- | arch/s390/include/asm/cputime.h | 42 | ||||
-rw-r--r-- | arch/s390/include/asm/lowcore.h | 49 | ||||
-rw-r--r-- | arch/s390/include/asm/system.h | 4 | ||||
-rw-r--r-- | arch/s390/include/asm/thread_info.h | 2 | ||||
-rw-r--r-- | arch/s390/include/asm/timer.h | 16 | ||||
-rw-r--r-- | arch/s390/include/asm/vdso.h | 15 | ||||
-rw-r--r-- | arch/s390/kernel/asm-offsets.c | 5 | ||||
-rw-r--r-- | arch/s390/kernel/entry.S | 5 | ||||
-rw-r--r-- | arch/s390/kernel/entry64.S | 50 | ||||
-rw-r--r-- | arch/s390/kernel/head64.S | 2 | ||||
-rw-r--r-- | arch/s390/kernel/process.c | 43 | ||||
-rw-r--r-- | arch/s390/kernel/s390_ext.c | 2 | ||||
-rw-r--r-- | arch/s390/kernel/setup.c | 2 | ||||
-rw-r--r-- | arch/s390/kernel/smp.c | 34 | ||||
-rw-r--r-- | arch/s390/kernel/vdso.c | 123 | ||||
-rw-r--r-- | arch/s390/kernel/vdso64/clock_getres.S | 5 | ||||
-rw-r--r-- | arch/s390/kernel/vdso64/clock_gettime.S | 39 | ||||
-rw-r--r-- | arch/s390/kernel/vtime.c | 486 |
19 files changed, 563 insertions, 368 deletions
diff --git a/arch/s390/include/asm/cpu.h b/arch/s390/include/asm/cpu.h index e5a6a9ba3adf..d60a2eefb17b 100644 --- a/arch/s390/include/asm/cpu.h +++ b/arch/s390/include/asm/cpu.h @@ -14,7 +14,6 @@ struct s390_idle_data { spinlock_t lock; - unsigned int in_idle; unsigned long long idle_count; unsigned long long idle_enter; unsigned long long idle_time; @@ -22,12 +21,12 @@ struct s390_idle_data { DECLARE_PER_CPU(struct s390_idle_data, s390_idle); -void s390_idle_leave(void); +void vtime_start_cpu(void); static inline void s390_idle_check(void) { - if ((&__get_cpu_var(s390_idle))->in_idle) - s390_idle_leave(); + if ((&__get_cpu_var(s390_idle))->idle_enter != 0ULL) + vtime_start_cpu(); } #endif /* _ASM_S390_CPU_H_ */ diff --git a/arch/s390/include/asm/cputime.h b/arch/s390/include/asm/cputime.h index 133ce054fc89..521726430afa 100644 --- a/arch/s390/include/asm/cputime.h +++ b/arch/s390/include/asm/cputime.h @@ -11,7 +11,7 @@ #include <asm/div64.h> -/* We want to use micro-second resolution. */ +/* We want to use full resolution of the CPU timer: 2**-12 micro-seconds. */ typedef unsigned long long cputime_t; typedef unsigned long long cputime64_t; @@ -53,9 +53,9 @@ __div(unsigned long long n, unsigned int base) #define cputime_ge(__a, __b) ((__a) >= (__b)) #define cputime_lt(__a, __b) ((__a) < (__b)) #define cputime_le(__a, __b) ((__a) <= (__b)) -#define cputime_to_jiffies(__ct) (__div((__ct), 1000000 / HZ)) +#define cputime_to_jiffies(__ct) (__div((__ct), 4096000000ULL / HZ)) #define cputime_to_scaled(__ct) (__ct) -#define jiffies_to_cputime(__hz) ((cputime_t)(__hz) * (1000000 / HZ)) +#define jiffies_to_cputime(__hz) ((cputime_t)(__hz) * (4096000000ULL / HZ)) #define cputime64_zero (0ULL) #define cputime64_add(__a, __b) ((__a) + (__b)) @@ -64,7 +64,7 @@ __div(unsigned long long n, unsigned int base) static inline u64 cputime64_to_jiffies64(cputime64_t cputime) { - do_div(cputime, 1000000 / HZ); + do_div(cputime, 4096000000ULL / HZ); return cputime; } @@ -74,13 +74,13 @@ cputime64_to_jiffies64(cputime64_t cputime) static inline unsigned int cputime_to_msecs(const cputime_t cputime) { - return __div(cputime, 1000); + return __div(cputime, 4096000); } static inline cputime_t msecs_to_cputime(const unsigned int m) { - return (cputime_t) m * 1000; + return (cputime_t) m * 4096000; } /* @@ -89,13 +89,13 @@ msecs_to_cputime(const unsigned int m) static inline unsigned int cputime_to_secs(const cputime_t cputime) { - return __div(cputime, 1000000); + return __div(cputime, 2048000000) >> 1; } static inline cputime_t secs_to_cputime(const unsigned int s) { - return (cputime_t) s * 1000000; + return (cputime_t) s * 4096000000ULL; } /* @@ -104,7 +104,7 @@ secs_to_cputime(const unsigned int s) static inline cputime_t timespec_to_cputime(const struct timespec *value) { - return value->tv_nsec / 1000 + (u64) value->tv_sec * 1000000; + return value->tv_nsec * 4096 / 1000 + (u64) value->tv_sec * 4096000000ULL; } static inline void @@ -114,12 +114,12 @@ cputime_to_timespec(const cputime_t cputime, struct timespec *value) register_pair rp; rp.pair = cputime >> 1; - asm ("dr %0,%1" : "+d" (rp) : "d" (1000000 >> 1)); - value->tv_nsec = rp.subreg.even * 1000; + asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL)); + value->tv_nsec = rp.subreg.even * 1000 / 4096; value->tv_sec = rp.subreg.odd; #else - value->tv_nsec = (cputime % 1000000) * 1000; - value->tv_sec = cputime / 1000000; + value->tv_nsec = (cputime % 4096000000ULL) * 1000 / 4096; + value->tv_sec = cputime / 4096000000ULL; #endif } @@ -131,7 +131,7 @@ cputime_to_timespec(const cputime_t cputime, struct timespec *value) static inline cputime_t timeval_to_cputime(const struct timeval *value) { - return value->tv_usec + (u64) value->tv_sec * 1000000; + return value->tv_usec * 4096 + (u64) value->tv_sec * 4096000000ULL; } static inline void @@ -141,12 +141,12 @@ cputime_to_timeval(const cputime_t cputime, struct timeval *value) register_pair rp; rp.pair = cputime >> 1; - asm ("dr %0,%1" : "+d" (rp) : "d" (1000000 >> 1)); - value->tv_usec = rp.subreg.even; + asm ("dr %0,%1" : "+d" (rp) : "d" (2048000000UL)); + value->tv_usec = rp.subreg.even / 4096; value->tv_sec = rp.subreg.odd; #else - value->tv_usec = cputime % 1000000; - value->tv_sec = cputime / 1000000; + value->tv_usec = cputime % 4096000000ULL; + value->tv_sec = cputime / 4096000000ULL; #endif } @@ -156,13 +156,13 @@ cputime_to_timeval(const cputime_t cputime, struct timeval *value) static inline clock_t cputime_to_clock_t(cputime_t cputime) { - return __div(cputime, 1000000 / USER_HZ); + return __div(cputime, 4096000000ULL / USER_HZ); } static inline cputime_t clock_t_to_cputime(unsigned long x) { - return (cputime_t) x * (1000000 / USER_HZ); + return (cputime_t) x * (4096000000ULL / USER_HZ); } /* @@ -171,7 +171,7 @@ clock_t_to_cputime(unsigned long x) static inline clock_t cputime64_to_clock_t(cputime64_t cputime) { - return __div(cputime, 1000000 / USER_HZ); + return __div(cputime, 4096000000ULL / USER_HZ); } #endif /* _S390_CPUTIME_H */ diff --git a/arch/s390/include/asm/lowcore.h b/arch/s390/include/asm/lowcore.h index 0bc51d52a899..ffdef5fe8587 100644 --- a/arch/s390/include/asm/lowcore.h +++ b/arch/s390/include/asm/lowcore.h @@ -67,11 +67,11 @@ #define __LC_SYNC_ENTER_TIMER 0x248 #define __LC_ASYNC_ENTER_TIMER 0x250 #define __LC_EXIT_TIMER 0x258 -#define __LC_LAST_UPDATE_TIMER 0x260 -#define __LC_USER_TIMER 0x268 -#define __LC_SYSTEM_TIMER 0x270 -#define __LC_LAST_UPDATE_CLOCK 0x278 -#define __LC_STEAL_CLOCK 0x280 +#define __LC_USER_TIMER 0x260 +#define __LC_SYSTEM_TIMER 0x268 +#define __LC_STEAL_TIMER 0x270 +#define __LC_LAST_UPDATE_TIMER 0x278 +#define __LC_LAST_UPDATE_CLOCK 0x280 #define __LC_RETURN_MCCK_PSW 0x288 #define __LC_KERNEL_STACK 0xC40 #define __LC_THREAD_INFO 0xC44 @@ -89,11 +89,11 @@ #define __LC_SYNC_ENTER_TIMER 0x250 #define __LC_ASYNC_ENTER_TIMER 0x258 #define __LC_EXIT_TIMER 0x260 -#define __LC_LAST_UPDATE_TIMER 0x268 -#define __LC_USER_TIMER 0x270 -#define __LC_SYSTEM_TIMER 0x278 -#define __LC_LAST_UPDATE_CLOCK 0x280 -#define __LC_STEAL_CLOCK 0x288 +#define __LC_USER_TIMER 0x268 +#define __LC_SYSTEM_TIMER 0x270 +#define __LC_STEAL_TIMER 0x278 +#define __LC_LAST_UPDATE_TIMER 0x280 +#define __LC_LAST_UPDATE_CLOCK 0x288 #define __LC_RETURN_MCCK_PSW 0x290 #define __LC_KERNEL_STACK 0xD40 #define __LC_THREAD_INFO 0xD48 @@ -106,8 +106,10 @@ #define __LC_IPLDEV 0xDB8 #define __LC_CURRENT 0xDD8 #define __LC_INT_CLOCK 0xDE8 +#define __LC_VDSO_PER_CPU 0xE38 #endif /* __s390x__ */ +#define __LC_PASTE 0xE40 #define __LC_PANIC_MAGIC 0xE00 #ifndef __s390x__ @@ -252,11 +254,11 @@ struct _lowcore __u64 sync_enter_timer; /* 0x248 */ __u64 async_enter_timer; /* 0x250 */ __u64 exit_timer; /* 0x258 */ - __u64 last_update_timer; /* 0x260 */ - __u64 user_timer; /* 0x268 */ - __u64 system_timer; /* 0x270 */ - __u64 last_update_clock; /* 0x278 */ - __u64 steal_clock; /* 0x280 */ + __u64 user_timer; /* 0x260 */ + __u64 system_timer; /* 0x268 */ + __u64 steal_timer; /* 0x270 */ + __u64 last_update_timer; /* 0x278 */ + __u64 last_update_clock; /* 0x280 */ psw_t return_mcck_psw; /* 0x288 */ __u8 pad8[0xc00-0x290]; /* 0x290 */ @@ -343,11 +345,11 @@ struct _lowcore __u64 sync_enter_timer; /* 0x250 */ __u64 async_enter_timer; /* 0x258 */ __u64 exit_timer; /* 0x260 */ - __u64 last_update_timer; /* 0x268 */ - __u64 user_timer; /* 0x270 */ - __u64 system_timer; /* 0x278 */ - __u64 last_update_clock; /* 0x280 */ - __u64 steal_clock; /* 0x288 */ + __u64 user_timer; /* 0x268 */ + __u64 system_timer; /* 0x270 */ + __u64 steal_timer; /* 0x278 */ + __u64 last_update_timer; /* 0x280 */ + __u64 last_update_clock; /* 0x288 */ psw_t return_mcck_psw; /* 0x290 */ __u8 pad8[0xc00-0x2a0]; /* 0x2a0 */ /* System info area */ @@ -381,7 +383,12 @@ struct _lowcore /* whether the kernel died with panic() or not */ __u32 panic_magic; /* 0xe00 */ - __u8 pad13[0x11b8-0xe04]; /* 0xe04 */ + /* Per cpu primary space access list */ + __u8 pad_0xe04[0xe3c-0xe04]; /* 0xe04 */ + __u32 vdso_per_cpu_data; /* 0xe3c */ + __u32 paste[16]; /* 0xe40 */ + + __u8 pad13[0x11b8-0xe80]; /* 0xe80 */ /* 64 bit extparam used for pfault, diag 250 etc */ __u64 ext_params2; /* 0x11B8 */ diff --git a/arch/s390/include/asm/system.h b/arch/s390/include/asm/system.h index 024ef42ed6d7..3a8b26eb1f2e 100644 --- a/arch/s390/include/asm/system.h +++ b/arch/s390/include/asm/system.h @@ -99,7 +99,7 @@ static inline void restore_access_regs(unsigned int *acrs) prev = __switch_to(prev,next); \ } while (0) -extern void account_vtime(struct task_struct *); +extern void account_vtime(struct task_struct *, struct task_struct *); extern void account_tick_vtime(struct task_struct *); extern void account_system_vtime(struct task_struct *); @@ -121,7 +121,7 @@ static inline void cmma_init(void) { } #define finish_arch_switch(prev) do { \ set_fs(current->thread.mm_segment); \ - account_vtime(prev); \ + account_vtime(prev, current); \ } while (0) #define nop() asm volatile("nop") diff --git a/arch/s390/include/asm/thread_info.h b/arch/s390/include/asm/thread_info.h index c1eaf9604da7..c544aa524535 100644 --- a/arch/s390/include/asm/thread_info.h +++ b/arch/s390/include/asm/thread_info.h @@ -47,6 +47,8 @@ struct thread_info { unsigned int cpu; /* current CPU */ int preempt_count; /* 0 => preemptable, <0 => BUG */ struct restart_block restart_block; + __u64 user_timer; + __u64 system_timer; }; /* diff --git a/arch/s390/include/asm/timer.h b/arch/s390/include/asm/timer.h index 61705d60f995..e4bcab739c19 100644 --- a/arch/s390/include/asm/timer.h +++ b/arch/s390/include/asm/timer.h @@ -23,20 +23,18 @@ struct vtimer_list { __u64 expires; __u64 interval; - spinlock_t lock; - unsigned long magic; - void (*function)(unsigned long); unsigned long data; }; -/* the offset value will wrap after ca. 71 years */ +/* the vtimer value will wrap after ca. 71 years */ struct vtimer_queue { struct list_head list; spinlock_t lock; - __u64 to_expire; /* current event expire time */ - __u64 offset; /* list offset to zero */ - __u64 idle; /* temp var for idle */ + __u64 timer; /* last programmed timer */ + __u64 elapsed; /* elapsed time of timer expire values */ + __u64 idle; /* temp var for idle */ + int do_spt; /* =1: reprogram cpu timer in idle */ }; extern void init_virt_timer(struct vtimer_list *timer); @@ -48,8 +46,8 @@ extern int del_virt_timer(struct vtimer_list *timer); extern void init_cpu_vtimer(void); extern void vtime_init(void); -extern void vtime_start_cpu_timer(void); -extern void vtime_stop_cpu_timer(void); +extern void vtime_stop_cpu(void); +extern void vtime_start_leave(void); #endif /* __KERNEL__ */ diff --git a/arch/s390/include/asm/vdso.h b/arch/s390/include/asm/vdso.h index a44f4fe16a35..7bdd7c8ebc91 100644 --- a/arch/s390/include/asm/vdso.h +++ b/arch/s390/include/asm/vdso.h @@ -12,9 +12,9 @@ #ifndef __ASSEMBLY__ /* - * Note about this structure: + * Note about the vdso_data and vdso_per_cpu_data structures: * - * NEVER USE THIS IN USERSPACE CODE DIRECTLY. The layout of this + * NEVER USE THEM IN USERSPACE CODE DIRECTLY. The layout of the * structure is supposed to be known only to the function in the vdso * itself and may change without notice. */ @@ -28,10 +28,21 @@ struct vdso_data { __u64 wtom_clock_nsec; /* 0x28 */ __u32 tz_minuteswest; /* Minutes west of Greenwich 0x30 */ __u32 tz_dsttime; /* Type of dst correction 0x34 */ + __u32 ectg_available; +}; + +struct vdso_per_cpu_data { + __u64 ectg_timer_base; + __u64 ectg_user_time; }; extern struct vdso_data *vdso_data; +#ifdef CONFIG_64BIT +int vdso_alloc_per_cpu(int cpu, struct _lowcore *lowcore); +void vdso_free_per_cpu(int cpu, struct _lowcore *lowcore); +#endif + #endif /* __ASSEMBLY__ */ #endif /* __KERNEL__ */ diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c index e641f60bac99..67a60016babb 100644 --- a/arch/s390/kernel/asm-offsets.c +++ b/arch/s390/kernel/asm-offsets.c @@ -48,6 +48,11 @@ int main(void) DEFINE(__VDSO_WTOM_SEC, offsetof(struct vdso_data, wtom_clock_sec)); DEFINE(__VDSO_WTOM_NSEC, offsetof(struct vdso_data, wtom_clock_nsec)); DEFINE(__VDSO_TIMEZONE, offsetof(struct vdso_data, tz_minuteswest)); + DEFINE(__VDSO_ECTG_OK, offsetof(struct vdso_data, ectg_available)); + DEFINE(__VDSO_ECTG_BASE, + offsetof(struct vdso_per_cpu_data, ectg_timer_base)); + DEFINE(__VDSO_ECTG_USER, + offsetof(struct vdso_per_cpu_data, ectg_user_time)); /* constants used by the vdso */ DEFINE(CLOCK_REALTIME, CLOCK_REALTIME); DEFINE(CLOCK_MONOTONIC, CLOCK_MONOTONIC); diff --git a/arch/s390/kernel/entry.S b/arch/s390/kernel/entry.S index 55de521aef77..1268aa2991bf 100644 --- a/arch/s390/kernel/entry.S +++ b/arch/s390/kernel/entry.S @@ -583,8 +583,8 @@ kernel_per: .globl io_int_handler io_int_handler: - stpt __LC_ASYNC_ENTER_TIMER stck __LC_INT_CLOCK + stpt __LC_ASYNC_ENTER_TIMER SAVE_ALL_BASE __LC_SAVE_AREA+16 SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+16 @@ -723,8 +723,8 @@ io_notify_resume: .globl ext_int_handler ext_int_handler: - stpt __LC_ASYNC_ENTER_TIMER stck __LC_INT_CLOCK + stpt __LC_ASYNC_ENTER_TIMER SAVE_ALL_BASE __LC_SAVE_AREA+16 SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+16 @@ -750,6 +750,7 @@ __critical_end: .globl mcck_int_handler mcck_int_handler: + stck __LC_INT_CLOCK spt __LC_CPU_TIMER_SAVE_AREA # revalidate cpu timer lm %r0,%r15,__LC_GPREGS_SAVE_AREA # revalidate gprs SAVE_ALL_BASE __LC_SAVE_AREA+32 diff --git a/arch/s390/kernel/entry64.S b/arch/s390/kernel/entry64.S index 16bb4fd1a403..c6fbde13971a 100644 --- a/arch/s390/kernel/entry64.S +++ b/arch/s390/kernel/entry64.S @@ -177,8 +177,11 @@ _TIF_WORK_INT = (_TIF_SIGPENDING | _TIF_NOTIFY_RESUME | _TIF_NEED_RESCHED | \ .if !\sync ni \psworg+1,0xfd # clear wait state bit .endif - lmg %r0,%r15,SP_R0(%r15) # load gprs 0-15 of user + lg %r14,__LC_VDSO_PER_CPU + lmg %r0,%r13,SP_R0(%r15) # load gprs 0-13 of user stpt __LC_EXIT_TIMER + mvc __VDSO_ECTG_BASE(16,%r14),__LC_EXIT_TIMER + lmg %r14,%r15,SP_R14(%r15) # load grps 14-15 of user lpswe \psworg # back to caller .endm @@ -559,8 +562,8 @@ kernel_per: */ .globl io_int_handler io_int_handler: - stpt __LC_ASYNC_ENTER_TIMER stck __LC_INT_CLOCK + stpt __LC_ASYNC_ENTER_TIMER SAVE_ALL_BASE __LC_SAVE_AREA+32 SAVE_ALL_ASYNC __LC_IO_OLD_PSW,__LC_SAVE_AREA+32 CREATE_STACK_FRAME __LC_IO_OLD_PSW,__LC_SAVE_AREA+32 @@ -721,8 +724,8 @@ io_notify_resume: */ .globl ext_int_handler ext_int_handler: - stpt __LC_ASYNC_ENTER_TIMER stck __LC_INT_CLOCK + stpt __LC_ASYNC_ENTER_TIMER SAVE_ALL_BASE __LC_SAVE_AREA+32 SAVE_ALL_ASYNC __LC_EXT_OLD_PSW,__LC_SAVE_AREA+32 CREATE_STACK_FRAME __LC_EXT_OLD_PSW,__LC_SAVE_AREA+32 @@ -746,6 +749,7 @@ __critical_end: */ .globl mcck_int_handler mcck_int_handler: + stck __LC_INT_CLOCK la %r1,4095 # revalidate r1 spt __LC_CPU_TIMER_SAVE_AREA-4095(%r1) # revalidate cpu timer lmg %r0,%r15,__LC_GPREGS_SAVE_AREA-4095(%r1)# revalidate gprs @@ -979,23 +983,23 @@ cleanup_sysc_return: cleanup_sysc_leave: clc 8(8,%r12),BASED(cleanup_sysc_leave_insn) - je 2f - mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER + je 3f clc 8(8,%r12),BASED(cleanup_sysc_leave_insn+8) - je 2f - mvc __LC_RETURN_PSW(16),SP_PSW(%r15) + jhe 0f + mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER +0: mvc __LC_RETURN_PSW(16),SP_PSW(%r15) cghi %r12,__LC_MCK_OLD_PSW - jne 0f + jne 1f mvc __LC_SAVE_AREA+64(32),SP_R12(%r15) - j 1f -0: mvc __LC_SAVE_AREA+32(32),SP_R12(%r15) -1: lmg %r0,%r11,SP_R0(%r15) + j 2f +1: mvc __LC_SAVE_AREA+32(32),SP_R12(%r15) +2: lmg %r0,%r11,SP_R0(%r15) lg %r15,SP_R15(%r15) -2: la %r12,__LC_RETURN_PSW +3: la %r12,__LC_RETURN_PSW br %r14 cleanup_sysc_leave_insn: .quad sysc_done - 4 - .quad sysc_done - 8 + .quad sysc_done - 16 cleanup_io_return: mvc __LC_RETURN_PSW(8),0(%r12) @@ -1005,23 +1009,23 @@ cleanup_io_return: cleanup_io_leave: clc 8(8,%r12),BASED(cleanup_io_leave_insn) - je 2f - mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER + je 3f clc 8(8,%r12),BASED(cleanup_io_leave_insn+8) - je 2f - mvc __LC_RETURN_PSW(16),SP_PSW(%r15) + jhe 0f + mvc __LC_EXIT_TIMER(8),__LC_ASYNC_ENTER_TIMER +0: mvc __LC_RETURN_PSW(16),SP_PSW(%r15) cghi %r12,__LC_MCK_OLD_PSW - jne 0f + jne 1f mvc __LC_SAVE_AREA+64(32),SP_R12(%r15) - j 1f -0: mvc __LC_SAVE_AREA+32(32),SP_R12(%r15) -1: lmg %r0,%r11,SP_R0(%r15) + j 2f +1: mvc __LC_SAVE_AREA+32(32),SP_R12(%r15) +2: lmg %r0,%r11,SP_R0(%r15) lg %r15,SP_R15(%r15) -2: la %r12,__LC_RETURN_PSW +3: la %r12,__LC_RETURN_PSW br %r14 cleanup_io_leave_insn: .quad io_done - 4 - .quad io_done - 8 + .quad io_done - 16 /* * Integer constants diff --git a/arch/s390/kernel/head64.S b/arch/s390/kernel/head64.S index 3ccd36b24b8f..f9f70aa15244 100644 --- a/arch/s390/kernel/head64.S +++ b/arch/s390/kernel/head64.S @@ -87,6 +87,8 @@ startup_continue: lg %r12,.Lparmaddr-.LPG1(%r13) # pointer to parameter area # move IPL device to lowcore mvc __LC_IPLDEV(4),IPL_DEVICE+4-PARMAREA(%r12) + lghi %r0,__LC_PASTE + stg %r0,__LC_VDSO_PER_CPU # # Setup stack # diff --git a/arch/s390/kernel/process.c b/arch/s390/kernel/process.c index 04f8c67a6101..b6110bdf8dc2 100644 --- a/arch/s390/kernel/process.c +++ b/arch/s390/kernel/process.c @@ -38,6 +38,7 @@ #include <linux/utsname.h> #include <linux/tick.h> #include <linux/elfcore.h> +#include <linux/kernel_stat.h> #include <asm/uaccess.h> #include <asm/pgtable.h> #include <asm/system.h> @@ -45,7 +46,6 @@ #include <asm/processor.h> #include <asm/irq.h> #include <asm/timer.h> -#include <asm/cpu.h> #include "entry.h" asmlinkage void ret_from_fork(void) asm ("ret_from_fork"); @@ -75,36 +75,6 @@ unsigned long thread_saved_pc(struct task_struct *tsk) return sf->gprs[8]; } -DEFINE_PER_CPU(struct s390_idle_data, s390_idle) = { - .lock = __SPIN_LOCK_UNLOCKED(s390_idle.lock) -}; - -static int s390_idle_enter(void) -{ - struct s390_idle_data *idle; - - idle = &__get_cpu_var(s390_idle); - spin_lock(&idle->lock); - idle->idle_count++; - idle->in_idle = 1; - idle->idle_enter = get_clock(); - spin_unlock(&idle->lock); - vtime_stop_cpu_timer(); - return NOTIFY_OK; -} - -void s390_idle_leave(void) -{ - struct s390_idle_data *idle; - - vtime_start_cpu_timer(); - idle = &__get_cpu_var(s390_idle); - spin_lock(&idle->lock); - idle->idle_time += get_clock() - idle->idle_enter; - idle->in_idle = 0; - spin_unlock(&idle->lock); -} - extern void s390_handle_mcck(void); /* * The idle loop on a S390... @@ -117,10 +87,6 @@ static void default_idle(void) local_irq_enable(); return; } - if (s390_idle_enter() == NOTIFY_BAD) { - local_irq_enable(); - return; - } #ifdef CONFIG_HOTPLUG_CPU if (cpu_is_offline(smp_processor_id())) { preempt_enable_no_resched(); @@ -130,7 +96,6 @@ static void default_idle(void) local_mcck_disable(); if (test_thread_flag(TIF_MCCK_PENDING)) { local_mcck_enable(); - s390_idle_leave(); local_irq_enable(); s390_handle_mcck(); return; @@ -138,9 +103,9 @@ static void default_idle(void) trace_hardirqs_on(); /* Don't trace preempt off for idle. */ stop_critical_timings(); - /* Wait for external, I/O or machine check interrupt. */ - __load_psw_mask(psw_kernel_bits | PSW_MASK_WAIT | - PSW_MASK_IO | PSW_MASK_EXT); + /* Stop virtual timer and halt the cpu. */ + vtime_stop_cpu(); + /* Reenable preemption tracer. */ start_critical_timings(); } diff --git a/arch/s390/kernel/s390_ext.c b/arch/s390/kernel/s390_ext.c index e019b419efc6..a0d2d55d7fb3 100644 --- a/arch/s390/kernel/s390_ext.c +++ b/arch/s390/kernel/s390_ext.c @@ -119,8 +119,8 @@ void do_extint(struct pt_regs *regs, unsigned short code) struct pt_regs *old_regs; old_regs = set_irq_regs(regs); - irq_enter(); s390_idle_check(); + irq_enter(); if (S390_lowcore.int_clock >= S390_lowcore.clock_comparator) /* Serve timer interrupts first. */ clock_comparator_work(); diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index b7a1efd5522c..d825f4950e4e 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -427,6 +427,8 @@ setup_lowcore(void) /* enable extended save area */ __ctl_set_bit(14, 29); } +#else + lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; #endif set_prefix((u32)(unsigned long) lc); } diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index 3ed5c7a83c6c..9c0ccb532a45 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -47,6 +47,7 @@ #include <asm/lowcore.h> #include <asm/sclp.h> #include <asm/cpu.h> +#include <asm/vdso.h> #include "entry.h" /* @@ -500,6 +501,9 @@ static int __cpuinit smp_alloc_lowcore(int cpu) goto out; lowcore->extended_save_area_addr = (u32) save_area; } +#else + if (vdso_alloc_per_cpu(cpu, lowcore)) + goto out; #endif lowcore_ptr[cpu] = lowcore; return 0; @@ -522,6 +526,8 @@ static void smp_free_lowcore(int cpu) #ifndef CONFIG_64BIT if (MACHINE_HAS_IEEE) free_page((unsigned long) lowcore->extended_save_area_addr); +#else + vdso_free_per_cpu(cpu, lowcore); #endif free_page(lowcore->panic_stack - PAGE_SIZE); free_pages(lowcore->async_stack - ASYNC_SIZE, ASYNC_ORDER); @@ -664,6 +670,7 @@ void __init smp_prepare_cpus(unsigned int max_cpus) lowcore = (void *) __get_free_pages(GFP_KERNEL | GFP_DMA, lc_order); panic_stack = __get_free_page(GFP_KERNEL); async_stack = __get_free_pages(GFP_KERNEL, ASYNC_ORDER); + BUG_ON(!lowcore || !panic_stack || !async_stack); #ifndef CONFIG_64BIT if (MACHINE_HAS_IEEE) save_area = get_zeroed_page(GFP_KERNEL); @@ -677,6 +684,8 @@ void __init smp_prepare_cpus(unsigned int max_cpus) #ifndef CONFIG_64BIT if (MACHINE_HAS_IEEE) lowcore->extended_save_area_addr = (u32) save_area; +#else + BUG_ON(vdso_alloc_per_cpu(smp_processor_id(), lowcore)); #endif set_prefix((u32)(unsigned long) lowcore); local_mcck_enable(); @@ -845,9 +854,11 @@ static ssize_t show_idle_count(struct sys_device *dev, unsigned long long idle_count; idle = &per_cpu(s390_idle, dev->id); - spin_lock_irq(&idle->lock); + spin_lock(&idle->lock); idle_count = idle->idle_count; - spin_unlock_irq(&idle->lock); + if (idle->idle_enter) + idle_count++; + spin_unlock(&idle->lock); return sprintf(buf, "%llu\n", idle_count); } static SYSDEV_ATTR(idle_count, 0444, show_idle_count, NULL); @@ -856,18 +867,17 @@ static ssize_t show_idle_time(struct sys_device *dev, struct sysdev_attribute *attr, char *buf) { struct s390_idle_data *idle; - unsigned long long new_time; + unsigned long long now, idle_time, idle_enter; idle = &per_cpu(s390_idle, dev->id); - spin_lock_irq(&idle->lock); - if (idle->in_idle) { - new_time = get_clock(); - idle->idle_time += new_time - idle->idle_enter; - idle->idle_enter = new_time; - } - new_time = idle->idle_time; - spin_unlock_irq(&idle->lock); - return sprintf(buf, "%llu\n", new_time >> 12); + spin_lock(&idle->lock); + now = get_clock(); + idle_time = idle->idle_time; + idle_enter = idle->idle_enter; + if (idle_enter != 0ULL && idle_enter < now) + idle_time += now - idle_enter; + spin_unlock(&idle->lock); + return sprintf(buf, "%llu\n", idle_time >> 12); } static SYSDEV_ATTR(idle_time_us, 0444, show_idle_time, NULL); diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c index 10a6ccef4412..25a6a82f1c02 100644 --- a/arch/s390/kernel/vdso.c +++ b/arch/s390/kernel/vdso.c @@ -31,9 +31,6 @@ #include <asm/sections.h> #include <asm/vdso.h> -/* Max supported size for symbol names */ -#define MAX_SYMNAME 64 - #if defined(CONFIG_32BIT) || defined(CONFIG_COMPAT) extern char vdso32_start, vdso32_end; static void *vdso32_kbase = &vdso32_start; @@ -71,6 +68,119 @@ static union { struct vdso_data *vdso_data = &vdso_data_store.data; /* + * Setup vdso data page. + */ +static void vdso_init_data(struct vdso_data *vd) +{ + unsigned int facility_list; + + facility_list = stfl(); + vd->ectg_available = switch_amode && (facility_list & 1); +} + +#ifdef CONFIG_64BIT +/* + * Setup per cpu vdso data page. + */ +static void vdso_init_per_cpu_data(int cpu, struct vdso_per_cpu_data *vpcd) +{ +} + +/* + * Allocate/free per cpu vdso data. + */ +#ifdef CONFIG_64BIT +#define SEGMENT_ORDER 2 +#else +#define SEGMENT_ORDER 1 +#endif + +int vdso_alloc_per_cpu(int cpu, struct _lowcore *lowcore) +{ + unsigned long segment_table, page_table, page_frame; + u32 *psal, *aste; + int i; + + lowcore->vdso_per_cpu_data = __LC_PASTE; + + if (!switch_amode || !vdso_enabled) + return 0; + + segment_table = __get_free_pages(GFP_KERNEL, SEGMENT_ORDER); + page_table = get_zeroed_page(GFP_KERNEL | GFP_DMA); + page_frame = get_zeroed_page(GFP_KERNEL); + if (!segment_table || !page_table || !page_frame) + goto out; + + clear_table((unsigned long *) segment_table, _SEGMENT_ENTRY_EMPTY, + PAGE_SIZE << SEGMENT_ORDER); + clear_table((unsigned long *) page_table, _PAGE_TYPE_EMPTY, + 256*sizeof(unsigned long)); + + *(unsigned long *) segment_table = _SEGMENT_ENTRY + page_table; + *(unsigned long *) page_table = _PAGE_RO + page_frame; + + psal = (u32 *) (page_table + 256*sizeof(unsigned long)); + aste = psal + 32; + + for (i = 4; i < 32; i += 4) + psal[i] = 0x80000000; + + lowcore->paste[4] = (u32)(addr_t) psal; + psal[0] = 0x20000000; + psal[2] = (u32)(addr_t) aste; + *(unsigned long *) (aste + 2) = segment_table + + _ASCE_TABLE_LENGTH + _ASCE_USER_BITS + _ASCE_TYPE_SEGMENT; + aste[4] = (u32)(addr_t) psal; + lowcore->vdso_per_cpu_data = page_frame; + + vdso_init_per_cpu_data(cpu, (struct vdso_per_cpu_data *) page_frame); + return 0; + +out: + free_page(page_frame); + free_page(page_table); + free_pages(segment_table, SEGMENT_ORDER); + return -ENOMEM; +} + +#ifdef CONFIG_HOTPLUG_CPU +void vdso_free_per_cpu(int cpu, struct _lowcore *lowcore) +{ + unsigned long segment_table, page_table, page_frame; + u32 *psal, *aste; + + if (!switch_amode || !vdso_enabled) + return; + + psal = (u32 *)(addr_t) lowcore->paste[4]; + aste = (u32 *)(addr_t) psal[2]; + segment_table = *(unsigned long *)(aste + 2) & PAGE_MASK; + page_table = *(unsigned long *) segment_table; + page_frame = *(unsigned long *) page_table; + + free_page(page_frame); + free_page(page_table); + free_pages(segment_table, SEGMENT_ORDER); +} +#endif /* CONFIG_HOTPLUG_CPU */ + +static void __vdso_init_cr5(void *dummy) +{ + unsigned long cr5; + + cr5 = offsetof(struct _lowcore, paste); + __ctl_load(cr5, 5, 5); +} + +static void vdso_init_cr5(void) +{ + if (switch_amode && vdso_enabled) + on_each_cpu(__vdso_init_cr5, NULL, 1); +} +#endif /* CONFIG_64BIT */ + +/* * This is called from binfmt_elf, we create the special vma for the * vDSO and insert it into the mm struct tree */ @@ -172,6 +282,9 @@ static int __init vdso_init(void) { int i; + if (!vdso_enabled) + return 0; + vdso_init_data(vdso_data); #if defined(CONFIG_32BIT) || defined(CONFIG_COMPAT) /* Calculate the size of the 32 bit vDSO */ vdso32_pages = ((&vdso32_end - &vdso32_start @@ -208,6 +321,10 @@ static int __init vdso_init(void) } vdso64_pagelist[vdso64_pages - 1] = virt_to_page(vdso_data); |