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powerpc: Rework runlatch code

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This moves the inlines into system.h and changes the runlatch
code to use the thread local flags (non-atomic) rather than
the TIF flags (atomic) to keep track of the latch state.

The code to turn it back on in an asynchronous interrupt is
now simplified and partially inlined.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Benjamin Herrenschmidt 2012-03-01 12:45:27 +11:00
parent 7450f6f03e
commit fe1952fc0a
6 changed files with 89 additions and 57 deletions
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50
arch/powerpc/include/asm/exception-64s.h
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@ -284,35 +284,39 @@ label##_hv: \
rlwimi r11,r12,0,MSR_EE; \
mtmsrd r11,1
#define STD_EXCEPTION_COMMON(trap, label, hdlr) \
.align 7; \
.globl label##_common; \
label##_common: \
EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \
DISABLE_INTS; \
bl .save_nvgprs; \
addi r3,r1,STACK_FRAME_OVERHEAD; \
bl hdlr; \
b .ret_from_except
#define ADD_NVGPRS \
bl .save_nvgprs
#define RUNLATCH_ON \
BEGIN_FTR_SECTION \
clrrdi r3,r1,THREAD_SHIFT; \
ld r4,TI_LOCAL_FLAGS(r3); \
andi. r0,r4,_TLF_RUNLATCH; \
beql ppc64_runlatch_on_trampoline; \
END_FTR_SECTION_IFSET(CPU_FTR_CTRL)
#define EXCEPTION_COMMON(trap, label, hdlr, ret, additions) \
.align 7; \
.globl label##_common; \
label##_common: \
EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \
additions; \
addi r3,r1,STACK_FRAME_OVERHEAD; \
bl hdlr; \
b ret
#define STD_EXCEPTION_COMMON(trap, label, hdlr) \
EXCEPTION_COMMON(trap, label, hdlr, ret_from_except, \
ADD_NVGPRS;DISABLE_INTS)
/*
* Like STD_EXCEPTION_COMMON, but for exceptions that can occur
* in the idle task and therefore need the special idle handling
* (finish nap and runlatch)
*/
#define STD_EXCEPTION_COMMON_ASYNC(trap, label, hdlr) \
.align 7; \
.globl label##_common; \
label##_common: \
EXCEPTION_PROLOG_COMMON(trap, PACA_EXGEN); \
FINISH_NAP; \
DISABLE_INTS; \
BEGIN_FTR_SECTION \
bl .ppc64_runlatch_on; \
END_FTR_SECTION_IFSET(CPU_FTR_CTRL) \
addi r3,r1,STACK_FRAME_OVERHEAD; \
bl hdlr; \
b .ret_from_except_lite
#define STD_EXCEPTION_COMMON_ASYNC(trap, label, hdlr) \
EXCEPTION_COMMON(trap, label, hdlr, ret_from_except_lite, \
FINISH_NAP;RUNLATCH_ON;DISABLE_INTS)
/*
* When the idle code in power4_idle puts the CPU into NAP mode,

22
arch/powerpc/include/asm/reg.h
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@ -1079,30 +1079,12 @@
#define proc_trap() asm volatile("trap")
#ifdef CONFIG_PPC64
extern void ppc64_runlatch_on(void);
extern void __ppc64_runlatch_off(void);
#define ppc64_runlatch_off() \
do { \
if (cpu_has_feature(CPU_FTR_CTRL) && \
test_thread_flag(TIF_RUNLATCH)) \
__ppc64_runlatch_off(); \
} while (0)
#define __get_SP() ({unsigned long sp; \
asm volatile("mr %0,1": "=r" (sp)); sp;})
extern unsigned long scom970_read(unsigned int address);
extern void scom970_write(unsigned int address, unsigned long value);
#else
#define ppc64_runlatch_on()
#define ppc64_runlatch_off()
#endif /* CONFIG_PPC64 */
#define __get_SP() ({unsigned long sp; \
asm volatile("mr %0,1": "=r" (sp)); sp;})
struct pt_regs;
extern void ppc_save_regs(struct pt_regs *regs);

38
arch/powerpc/include/asm/system.h
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@ -550,5 +550,43 @@ extern void reloc_got2(unsigned long);
extern struct dentry *powerpc_debugfs_root;
#ifdef CONFIG_PPC64
extern void __ppc64_runlatch_on(void);
extern void __ppc64_runlatch_off(void);
/*
* We manually hard enable-disable, this is called
* in the idle loop and we don't want to mess up
* with soft-disable/enable & interrupt replay.
*/
#define ppc64_runlatch_off() \
do { \
if (cpu_has_feature(CPU_FTR_CTRL) && \
test_thread_local_flags(_TLF_RUNLATCH)) { \
unsigned long msr = mfmsr(); \
__hard_irq_disable(); \
__ppc64_runlatch_off(); \
if (msr & MSR_EE) \
__hard_irq_enable(); \
} \
} while (0)
#define ppc64_runlatch_on() \
do { \
if (cpu_has_feature(CPU_FTR_CTRL) && \
!test_thread_local_flags(_TLF_RUNLATCH)) { \
unsigned long msr = mfmsr(); \
__hard_irq_disable(); \
__ppc64_runlatch_on(); \
if (msr & MSR_EE) \
__hard_irq_enable(); \
} \
} while (0)
#else
#define ppc64_runlatch_on()
#define ppc64_runlatch_off()
#endif /* CONFIG_PPC64 */
#endif /* __KERNEL__ */
#endif /* _ASM_POWERPC_SYSTEM_H */

9
arch/powerpc/include/asm/thread_info.h
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@ -110,7 +110,6 @@ static inline struct thread_info *current_thread_info(void)
#define TIF_NOERROR 12 /* Force successful syscall return */
#define TIF_NOTIFY_RESUME 13 /* callback before returning to user */
#define TIF_SYSCALL_TRACEPOINT 15 /* syscall tracepoint instrumentation */
#define TIF_RUNLATCH 16 /* Is the runlatch enabled? */
/* as above, but as bit values */
#define _TIF_SYSCALL_TRACE (1<<TIF_SYSCALL_TRACE)
@ -141,11 +140,13 @@ static inline struct thread_info *current_thread_info(void)
#define TLF_SLEEPING 1 /* suspend code enabled SLEEP mode */
#define TLF_RESTORE_SIGMASK 2 /* Restore signal mask in do_signal */
#define TLF_LAZY_MMU 3 /* tlb_batch is active */
#define TLF_RUNLATCH 4 /* Is the runlatch enabled? */
#define _TLF_NAPPING (1 << TLF_NAPPING)
#define _TLF_SLEEPING (1 << TLF_SLEEPING)
#define _TLF_RESTORE_SIGMASK (1 << TLF_RESTORE_SIGMASK)
#define _TLF_LAZY_MMU (1 << TLF_LAZY_MMU)
#define _TLF_RUNLATCH (1 << TLF_RUNLATCH)
#ifndef __ASSEMBLY__
#define HAVE_SET_RESTORE_SIGMASK 1
@ -156,6 +157,12 @@ static inline void set_restore_sigmask(void)
set_bit(TIF_SIGPENDING, &ti->flags);
}
static inline bool test_thread_local_flags(unsigned int flags)
{
struct thread_info *ti = current_thread_info();
return (ti->local_flags & flags) != 0;
}
#ifdef CONFIG_PPC64
#define is_32bit_task() (test_thread_flag(TIF_32BIT))
#else

3
arch/powerpc/kernel/exceptions-64s.S
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@ -483,6 +483,9 @@ machine_check_common:
system_call_entry:
b system_call_common
ppc64_runlatch_on_trampoline:
b .__ppc64_runlatch_on
/*
* Here we have detected that the kernel stack pointer is bad.
* R9 contains the saved CR, r13 points to the paca,

24
arch/powerpc/kernel/process.c
View File

@ -1220,34 +1220,32 @@ void dump_stack(void)
EXPORT_SYMBOL(dump_stack);
#ifdef CONFIG_PPC64
void ppc64_runlatch_on(void)
/* Called with hard IRQs off */
void __ppc64_runlatch_on(void)
{
struct thread_info *ti = current_thread_info();
unsigned long ctrl;
if (cpu_has_feature(CPU_FTR_CTRL) && !test_thread_flag(TIF_RUNLATCH)) {
HMT_medium();
ctrl = mfspr(SPRN_CTRLF);
ctrl |= CTRL_RUNLATCH;
mtspr(SPRN_CTRLT, ctrl);
ctrl = mfspr(SPRN_CTRLF);
ctrl |= CTRL_RUNLATCH;
mtspr(SPRN_CTRLT, ctrl);
set_thread_flag(TIF_RUNLATCH);
}
ti->local_flags |= TLF_RUNLATCH;
}
/* Called with hard IRQs off */
void __ppc64_runlatch_off(void)
{
struct thread_info *ti = current_thread_info();
unsigned long ctrl;
HMT_medium();
clear_thread_flag(TIF_RUNLATCH);
ti->local_flags &= ~TLF_RUNLATCH;
ctrl = mfspr(SPRN_CTRLF);
ctrl &= ~CTRL_RUNLATCH;
mtspr(SPRN_CTRLT, ctrl);
}
#endif
#endif /* CONFIG_PPC64 */
#if THREAD_SHIFT < PAGE_SHIFT