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powerpc32: provide VIRT_CPU_ACCOUNTING

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This patch provides VIRT_CPU_ACCOUTING to PPC32 architecture.
PPC32 doesn't have the PACA structure, so we use the task_info
structure to store the accounting data.

In order to reuse on PPC32 the PPC64 functions, all u64 data has
been replaced by 'unsigned long' so that it is u32 on PPC32 and
u64 on PPC64

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Scott Wood <oss@buserror.net>
This commit is contained in:
Christophe Leroy 2016-05-17 08:33:46 +02:00 committed by Scott Wood
parent 1afbf61750
commit c223c90386
15 changed files with 158 additions and 67 deletions
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1
arch/powerpc/Kconfig
View File

@ -165,6 +165,7 @@ config PPC
select ARCH_HAS_UBSAN_SANITIZE_ALL
select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
select HAVE_VIRT_CPU_ACCOUNTING
config GENERIC_CSUM
def_bool CPU_LITTLE_ENDIAN

24
arch/powerpc/include/asm/accounting.h Normal file
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@ -0,0 +1,24 @@
/*
* Common time accounting prototypes and such for all ppc machines.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version
* 2 of the License, or (at your option) any later version.
*/
#ifndef __POWERPC_ACCOUNTING_H
#define __POWERPC_ACCOUNTING_H
/* Stuff for accurate time accounting */
struct cpu_accounting_data {
unsigned long user_time; /* accumulated usermode TB ticks */
unsigned long system_time; /* accumulated system TB ticks */
unsigned long user_time_scaled; /* accumulated usermode SPURR ticks */
unsigned long starttime; /* TB value snapshot */
unsigned long starttime_user; /* TB value on exit to usermode */
unsigned long startspurr; /* SPURR value snapshot */
unsigned long utime_sspurr; /* ->user_time when ->startspurr set */
};
#endif

14
arch/powerpc/include/asm/cputime.h
View File

@ -90,11 +90,10 @@ static inline void setup_cputime_one_jiffy(void)
static inline cputime64_t jiffies64_to_cputime64(const u64 jif)
{
u64 ct;
u64 sec;
u64 sec = jif;
/* have to be a little careful about overflow */
ct = jif % HZ;
sec = jif / HZ;
ct = do_div(sec, HZ);
if (ct) {
ct *= tb_ticks_per_sec;
do_div(ct, HZ);
@ -230,7 +229,16 @@ static inline cputime_t clock_t_to_cputime(const unsigned long clk)
#define cputime64_to_clock_t(ct) cputime_to_clock_t((cputime_t)(ct))
/*
* PPC64 uses PACA which is task independent for storing accounting data while
* PPC32 uses struct thread_info, therefore at task switch the accounting data
* has to be populated in the new task
*/
#ifdef CONFIG_PPC64
static inline void arch_vtime_task_switch(struct task_struct *tsk) { }
#else
void arch_vtime_task_switch(struct task_struct *tsk);
#endif
#endif /* __KERNEL__ */
#endif /* CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */

2
arch/powerpc/include/asm/exception-64s.h
View File

@ -287,7 +287,7 @@ do_kvm_##n: \
std r0,GPR0(r1); /* save r0 in stackframe */ \
std r10,GPR1(r1); /* save r1 in stackframe */ \
beq 4f; /* if from kernel mode */ \
ACCOUNT_CPU_USER_ENTRY(r9, r10); \
ACCOUNT_CPU_USER_ENTRY(r13, r9, r10); \
SAVE_PPR(area, r9, r10); \
4: EXCEPTION_PROLOG_COMMON_2(area) \
EXCEPTION_PROLOG_COMMON_3(n) \

9
arch/powerpc/include/asm/paca.h
View File

@ -25,6 +25,7 @@
#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
#include <asm/kvm_book3s_asm.h>
#endif
#include <asm/accounting.h>
register struct paca_struct *local_paca asm("r13");
@ -184,13 +185,7 @@ struct paca_struct {
#endif
/* Stuff for accurate time accounting */
u64 user_time; /* accumulated usermode TB ticks */
u64 system_time; /* accumulated system TB ticks */
u64 user_time_scaled; /* accumulated usermode SPURR ticks */
u64 starttime; /* TB value snapshot */
u64 starttime_user; /* TB value on exit to usermode */
u64 startspurr; /* SPURR value snapshot */
u64 utime_sspurr; /* ->user_time when ->startspurr set */
struct cpu_accounting_data accounting;
u64 stolen_time; /* TB ticks taken by hypervisor */
u64 dtl_ridx; /* read index in dispatch log */
struct dtl_entry *dtl_curr; /* pointer corresponding to dtl_ridx */

24
arch/powerpc/include/asm/ppc_asm.h
View File

@ -24,27 +24,27 @@
*/
#ifndef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
#define ACCOUNT_CPU_USER_ENTRY(ra, rb)
#define ACCOUNT_CPU_USER_EXIT(ra, rb)
#define ACCOUNT_CPU_USER_ENTRY(ptr, ra, rb)
#define ACCOUNT_CPU_USER_EXIT(ptr, ra, rb)
#define ACCOUNT_STOLEN_TIME
#else
#define ACCOUNT_CPU_USER_ENTRY(ra, rb) \
#define ACCOUNT_CPU_USER_ENTRY(ptr, ra, rb) \
MFTB(ra); /* get timebase */ \
ld rb,PACA_STARTTIME_USER(r13); \
std ra,PACA_STARTTIME(r13); \
PPC_LL rb, ACCOUNT_STARTTIME_USER(ptr); \
PPC_STL ra, ACCOUNT_STARTTIME(ptr); \
subf rb,rb,ra; /* subtract start value */ \
ld ra,PACA_USER_TIME(r13); \
PPC_LL ra, ACCOUNT_USER_TIME(ptr); \
add ra,ra,rb; /* add on to user time */ \
std ra,PACA_USER_TIME(r13); \
PPC_STL ra, ACCOUNT_USER_TIME(ptr); \
#define ACCOUNT_CPU_USER_EXIT(ra, rb) \
#define ACCOUNT_CPU_USER_EXIT(ptr, ra, rb) \
MFTB(ra); /* get timebase */ \
ld rb,PACA_STARTTIME(r13); \
std ra,PACA_STARTTIME_USER(r13); \
PPC_LL rb, ACCOUNT_STARTTIME(ptr); \
PPC_STL ra, ACCOUNT_STARTTIME_USER(ptr); \
subf rb,rb,ra; /* subtract start value */ \
ld ra,PACA_SYSTEM_TIME(r13); \
PPC_LL ra, ACCOUNT_SYSTEM_TIME(ptr); \
add ra,ra,rb; /* add on to system time */ \
std ra,PACA_SYSTEM_TIME(r13)
PPC_STL ra, ACCOUNT_SYSTEM_TIME(ptr)
#ifdef CONFIG_PPC_SPLPAR
#define ACCOUNT_STOLEN_TIME \

1
arch/powerpc/include/asm/reg.h
View File

@ -1294,6 +1294,7 @@ static inline unsigned long mfvtb (void)
asm volatile("mfspr %0, %1" : "=r" (rval) : \
"i" (SPRN_TBRU)); rval;})
#endif
#define mftb() mftbl()
#endif /* !__powerpc64__ */
#define mttbl(v) asm volatile("mttbl %0":: "r"(v))

4
arch/powerpc/include/asm/thread_info.h
View File

@ -33,6 +33,7 @@
#include <asm/processor.h>
#include <asm/page.h>
#include <linux/stringify.h>
#include <asm/accounting.h>
/*
* low level task data.
@ -45,6 +46,9 @@ struct thread_info {
unsigned long local_flags; /* private flags for thread */
#ifdef CONFIG_LIVEPATCH
unsigned long *livepatch_sp;
#endif
#if defined(CONFIG_VIRT_CPU_ACCOUNTING_NATIVE) && defined(CONFIG_PPC32)
struct cpu_accounting_data accounting;
#endif
/* low level flags - has atomic operations done on it */
unsigned long flags ____cacheline_aligned_in_smp;

23
arch/powerpc/kernel/asm-offsets.c
View File

@ -240,13 +240,28 @@ int main(void)
DEFINE(PACAHWCPUID, offsetof(struct paca_struct, hw_cpu_id));
DEFINE(PACAKEXECSTATE, offsetof(struct paca_struct, kexec_state));
DEFINE(PACA_DSCR_DEFAULT, offsetof(struct paca_struct, dscr_default));
DEFINE(PACA_STARTTIME, offsetof(struct paca_struct, starttime));
DEFINE(PACA_STARTTIME_USER, offsetof(struct paca_struct, starttime_user));
DEFINE(PACA_USER_TIME, offsetof(struct paca_struct, user_time));
DEFINE(PACA_SYSTEM_TIME, offsetof(struct paca_struct, system_time));
DEFINE(ACCOUNT_STARTTIME,
offsetof(struct paca_struct, accounting.starttime));
DEFINE(ACCOUNT_STARTTIME_USER,
offsetof(struct paca_struct, accounting.starttime_user));
DEFINE(ACCOUNT_USER_TIME,
offsetof(struct paca_struct, accounting.user_time));
DEFINE(ACCOUNT_SYSTEM_TIME,
offsetof(struct paca_struct, accounting.system_time));
DEFINE(PACA_TRAP_SAVE, offsetof(struct paca_struct, trap_save));
DEFINE(PACA_NAPSTATELOST, offsetof(struct paca_struct, nap_state_lost));
DEFINE(PACA_SPRG_VDSO, offsetof(struct paca_struct, sprg_vdso));
#else /* CONFIG_PPC64 */
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
DEFINE(ACCOUNT_STARTTIME,
offsetof(struct thread_info, accounting.starttime));
DEFINE(ACCOUNT_STARTTIME_USER,
offsetof(struct thread_info, accounting.starttime_user));
DEFINE(ACCOUNT_USER_TIME,
offsetof(struct thread_info, accounting.user_time));
DEFINE(ACCOUNT_SYSTEM_TIME,
offsetof(struct thread_info, accounting.system_time));
#endif
#endif /* CONFIG_PPC64 */
/* RTAS */

17
arch/powerpc/kernel/entry_32.S
View File

@ -175,6 +175,12 @@ transfer_to_handler:
addi r12,r12,-1
stw r12,4(r11)
#endif
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
CURRENT_THREAD_INFO(r9, r1)
tophys(r9, r9)
ACCOUNT_CPU_USER_ENTRY(r9, r11, r12)
#endif
b 3f
2: /* if from kernel, check interrupted DOZE/NAP mode and
@ -398,6 +404,13 @@ BEGIN_FTR_SECTION
lwarx r7,0,r1
END_FTR_SECTION_IFSET(CPU_FTR_NEED_PAIRED_STWCX)
stwcx. r0,0,r1 /* to clear the reservation */
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
andi. r4,r8,MSR_PR
beq 3f
CURRENT_THREAD_INFO(r4, r1)
ACCOUNT_CPU_USER_EXIT(r4, r5, r7)
3:
#endif
lwz r4,_LINK(r1)
lwz r5,_CCR(r1)
mtlr r4
@ -769,6 +782,10 @@ restore_user:
andis. r10,r0,DBCR0_IDM@h
bnel- load_dbcr0
#endif
#ifdef CONFIG_VIRT_CPU_ACCOUNTING_NATIVE
CURRENT_THREAD_INFO(r9, r1)
ACCOUNT_CPU_USER_EXIT(r9, r10, r11)
#endif
b restore

6
arch/powerpc/kernel/entry_64.S
View File

@ -72,7 +72,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_TM)
std r0,GPR0(r1)
std r10,GPR1(r1)
beq 2f /* if from kernel mode */
ACCOUNT_CPU_USER_ENTRY(r10, r11)
ACCOUNT_CPU_USER_ENTRY(r13, r10, r11)
2: std r2,GPR2(r1)
std r3,GPR3(r1)
mfcr r2
@ -246,7 +246,7 @@ END_FTR_SECTION_IFCLR(CPU_FTR_STCX_CHECKS_ADDRESS)
ld r4,_LINK(r1)
beq- 1f
ACCOUNT_CPU_USER_EXIT(r11, r12)
ACCOUNT_CPU_USER_EXIT(r13, r11, r12)
BEGIN_FTR_SECTION
HMT_MEDIUM_LOW
@ -859,7 +859,7 @@ END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
BEGIN_FTR_SECTION
mtspr SPRN_PPR,r2 /* Restore PPR */
END_FTR_SECTION_IFSET(CPU_FTR_HAS_PPR)
ACCOUNT_CPU_USER_EXIT(r2, r4)
ACCOUNT_CPU_USER_EXIT(r13, r2, r4)
REST_GPR(13, r1)
1:
mtspr SPRN_SRR1,r3

4
arch/powerpc/kernel/exceptions-64e.S
View File

@ -386,7 +386,7 @@ exc_##n##_common: \
std r10,_NIP(r1); /* save SRR0 to stackframe */ \
std r11,_MSR(r1); /* save SRR1 to stackframe */ \
beq 2f; /* if from kernel mode */ \
ACCOUNT_CPU_USER_ENTRY(r10,r11);/* accounting (uses cr0+eq) */ \
ACCOUNT_CPU_USER_ENTRY(r13,r10,r11);/* accounting (uses cr0+eq) */ \
2: ld r3,excf+EX_R10(r13); /* get back r10 */ \
ld r4,excf+EX_R11(r13); /* get back r11 */ \
mfspr r5,scratch; /* get back r13 */ \
@ -1059,7 +1059,7 @@ fast_exception_return:
andi. r6,r10,MSR_PR
REST_2GPRS(6, r1)
beq 1f
ACCOUNT_CPU_USER_EXIT(r10, r11)
ACCOUNT_CPU_USER_EXIT(r13, r10, r11)
ld r0,GPR13(r1)
1: stdcx. r0,0,r1 /* to clear the reservation */

81
arch/powerpc/kernel/time.c
View File

@ -167,7 +167,15 @@ DEFINE_PER_CPU(unsigned long, cputime_scaled_last_delta);
cputime_t cputime_one_jiffy;
#ifdef CONFIG_PPC_SPLPAR
void (*dtl_consumer)(struct dtl_entry *, u64);
#endif
#ifdef CONFIG_PPC64
#define get_accounting(tsk) (&get_paca()->accounting)
#else
#define get_accounting(tsk) (&task_thread_info(tsk)->accounting)
#endif
static void calc_cputime_factors(void)
{
@ -187,7 +195,7 @@ static void calc_cputime_factors(void)
* Read the SPURR on systems that have it, otherwise the PURR,
* or if that doesn't exist return the timebase value passed in.
*/
static u64 read_spurr(u64 tb)
static unsigned long read_spurr(unsigned long tb)
{
if (cpu_has_feature(CPU_FTR_SPURR))
return mfspr(SPRN_SPURR);
@ -250,8 +258,8 @@ static u64 scan_dispatch_log(u64 stop_tb)
void accumulate_stolen_time(void)
{
u64 sst, ust;
u8 save_soft_enabled = local_paca->soft_enabled;
struct cpu_accounting_data *acct = &local_paca->accounting;
/* We are called early in the exception entry, before
* soft/hard_enabled are sync'ed to the expected state
@ -261,10 +269,10 @@ void accumulate_stolen_time(void)
*/
local_paca->soft_enabled = 0;
sst = scan_dispatch_log(local_paca->starttime_user);
ust = scan_dispatch_log(local_paca->starttime);
local_paca->system_time -= sst;
local_paca->user_time -= ust;
sst = scan_dispatch_log(acct->starttime_user);
ust = scan_dispatch_log(acct->starttime);
acct->system_time -= sst;
acct->user_time -= ust;
local_paca->stolen_time += ust + sst;
local_paca->soft_enabled = save_soft_enabled;
@ -276,7 +284,7 @@ static inline u64 calculate_stolen_time(u64 stop_tb)
if (get_paca()->dtl_ridx != be64_to_cpu(get_lppaca()->dtl_idx)) {
stolen = scan_dispatch_log(stop_tb);
get_paca()->system_time -= stolen;
get_paca()->accounting.system_time -= stolen;
}
stolen += get_paca()->stolen_time;
@ -296,27 +304,29 @@ static inline u64 calculate_stolen_time(u64 stop_tb)
* Account time for a transition between system, hard irq
* or soft irq state.
*/
static u64 vtime_delta(struct task_struct *tsk,
u64 *sys_scaled, u64 *stolen)
static unsigned long vtime_delta(struct task_struct *tsk,
unsigned long *sys_scaled,
unsigned long *stolen)
{
u64 now, nowscaled, deltascaled;
u64 udelta, delta, user_scaled;
unsigned long now, nowscaled, deltascaled;
unsigned long udelta, delta, user_scaled;
struct cpu_accounting_data *acct = get_accounting(tsk);
WARN_ON_ONCE(!irqs_disabled());
now = mftb();
nowscaled = read_spurr(now);
get_paca()->system_time += now - get_paca()->starttime;
get_paca()->starttime = now;
deltascaled = nowscaled - get_paca()->startspurr;
get_paca()->startspurr = nowscaled;
acct->system_time += now - acct->starttime;
acct->starttime = now;
deltascaled = nowscaled - acct->startspurr;
acct->startspurr = nowscaled;
*stolen = calculate_stolen_time(now);
delta = get_paca()->system_time;
get_paca()->system_time = 0;
udelta = get_paca()->user_time - get_paca()->utime_sspurr;
get_paca()->utime_sspurr = get_paca()->user_time;
delta = acct->system_time;
acct->system_time = 0;
udelta = acct->user_time - acct->utime_sspurr;
acct->utime_sspurr = acct->user_time;
/*
* Because we don't read the SPURR on every kernel entry/exit,
@ -338,14 +348,14 @@ static u64 vtime_delta(struct task_struct *tsk,
*sys_scaled = deltascaled;
}
}
get_paca()->user_time_scaled += user_scaled;
acct->user_time_scaled += user_scaled;
return delta;
}
void vtime_account_system(struct task_struct *tsk)
{
u64 delta, sys_scaled, stolen;
unsigned long delta, sys_scaled, stolen;
delta = vtime_delta(tsk, &sys_scaled, &stolen);
account_system_time(tsk, 0, delta, sys_scaled);
@ -356,7 +366,7 @@ EXPORT_SYMBOL_GPL(vtime_account_system);
void vtime_account_idle(struct task_struct *tsk)
{
u64 delta, sys_scaled, stolen;
unsigned long delta, sys_scaled, stolen;
delta = vtime_delta(tsk, &sys_scaled, &stolen);
account_idle_time(delta + stolen);
@ -374,15 +384,32 @@ void vtime_account_idle(struct task_struct *tsk)
void vtime_account_user(struct task_struct *tsk)
{
cputime_t utime, utimescaled;
struct cpu_accounting_data *acct = get_accounting(tsk);
utime = get_paca()->user_time;
utimescaled = get_paca()->user_time_scaled;
get_paca()->user_time = 0;
get_paca()->user_time_scaled = 0;
get_paca()->utime_sspurr = 0;
utime = acct->user_time;
utimescaled = acct->user_time_scaled;
acct->user_time = 0;
acct->user_time_scaled = 0;
acct->utime_sspurr = 0;
account_user_time(tsk, utime, utimescaled);
}
#ifdef CONFIG_PPC32
/*
* Called from the context switch with interrupts disabled, to charge all
* accumulated times to the current process, and to prepare accounting on
* the next process.
*/
void arch_vtime_task_switch(struct task_struct *prev)
{
struct cpu_accounting_data *acct = get_accounting(current);
acct->starttime = get_accounting(prev)->starttime;
acct->system_time = 0;
acct->user_time = 0;
}
#endif /* CONFIG_PPC32 */
#else /* ! CONFIG_VIRT_CPU_ACCOUNTING_NATIVE */
#define calc_cputime_factors()
#endif

1
arch/powerpc/platforms/Kconfig.cputype
View File

@ -1,7 +1,6 @@
config PPC64
bool "64-bit kernel"
default n
select HAVE_VIRT_CPU_ACCOUNTING
select ZLIB_DEFLATE
help
This option selects whether a 32-bit or a 64-bit kernel

14
arch/powerpc/xmon/xmon.c
View File

@ -2213,13 +2213,13 @@ static void dump_one_paca(int cpu)
DUMP(p, subcore_sibling_mask, "x");
#endif
DUMP(p, user_time, "llx");
DUMP(p, system_time, "llx");
DUMP(p, user_time_scaled, "llx");
DUMP(p, starttime, "llx");
DUMP(p, starttime_user, "llx");
DUMP(p, startspurr, "llx");
DUMP(p, utime_sspurr, "llx");
DUMP(p, accounting.user_time, "llx");
DUMP(p, accounting.system_time, "llx");
DUMP(p, accounting.user_time_scaled, "llx");
DUMP(p, accounting.starttime, "llx");
DUMP(p, accounting.starttime_user, "llx");
DUMP(p, accounting.startspurr, "llx");
DUMP(p, accounting.utime_sspurr, "llx");
DUMP(p, stolen_time, "llx");
#undef DUMP