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Date: Wed, 23 May 2012 21:32:00 +0200 From: Jiri Olsa <jolsa@...hat.com> To: acme@...hat.com, a.p.zijlstra@...llo.nl, mingo@...e.hu, paulus@...ba.org, cjashfor@...ux.vnet.ibm.com, fweisbec@...il.com Cc: eranian@...gle.com, gorcunov@...nvz.org, tzanussi@...il.com, mhiramat@...hat.com, robert.richter@....com, fche@...hat.com, linux-kernel@...r.kernel.org, masami.hiramatsu.pt@...achi.com, drepper@...il.com, asharma@...com, benjamin.redelings@...cent.org, Jiri Olsa <jolsa@...hat.com> Subject: [PATCH 01/16] perf: Unified API to record selective sets of arch registers This brings a new API to help the selective dump of registers on event sampling, and its implementation in x86. Added HAVE_PERF_REGS config option to determine if the architecture provides perf registers ABI. The architecture must provide a non-zero and unique id to identify the origin of a register set because interpreting a register dump requires to know from which architecture it comes. The achitecture is considered different between the 32 and 64 bits. x86-32 has the id 1, x86-64 has the id 2. The information about desired registers will be passed in u64 mask. It's up to the architecture to map the registers into the mask bits. Signed-off-by: Frederic Weisbecker <fweisbec@...il.com> Signed-off-by: Jiri Olsa <jolsa@...hat.com> --- arch/Kconfig | 6 ++ arch/x86/Kconfig | 1 + arch/x86/include/asm/perf_regs.h | 10 ++++ arch/x86/include/asm/perf_regs_32.h | 84 +++++++++++++++++++++++++++++ arch/x86/include/asm/perf_regs_64.h | 99 +++++++++++++++++++++++++++++++++++ include/linux/perf_regs.h | 28 ++++++++++ 6 files changed, 228 insertions(+), 0 deletions(-) create mode 100644 arch/x86/include/asm/perf_regs.h create mode 100644 arch/x86/include/asm/perf_regs_32.h create mode 100644 arch/x86/include/asm/perf_regs_64.h create mode 100644 include/linux/perf_regs.h diff --git a/arch/Kconfig b/arch/Kconfig index e9a9108..6c37af4 100644 --- a/arch/Kconfig +++ b/arch/Kconfig @@ -219,6 +219,12 @@ config HAVE_PERF_EVENTS_NMI subsystem. Also has support for calculating CPU cycle events to determine how many clock cycles in a given period. +config HAVE_PERF_REGS + bool + help + Support selective register dumps for perf events. This includes + bit-mapping of each registers and a unique architecture id. + config HAVE_ARCH_JUMP_LABEL bool diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index 5638c74..77e155c 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -59,6 +59,7 @@ config X86 select HAVE_MIXED_BREAKPOINTS_REGS select PERF_EVENTS select HAVE_PERF_EVENTS_NMI + select HAVE_PERF_REGS select ANON_INODES select HAVE_ALIGNED_STRUCT_PAGE if SLUB && !M386 select HAVE_CMPXCHG_LOCAL if !M386 diff --git a/arch/x86/include/asm/perf_regs.h b/arch/x86/include/asm/perf_regs.h new file mode 100644 index 0000000..c2ea804 --- /dev/null +++ b/arch/x86/include/asm/perf_regs.h @@ -0,0 +1,10 @@ +#ifndef _ASM_X86_PERF_REGS_H +#define _ASM_X86_PERF_REGS_H + +#ifdef CONFIG_X86_32 +#include "perf_regs_32.h" +#else +#include "perf_regs_64.h" +#endif + +#endif /* _ASM_X86_PERF_REGS_H */ diff --git a/arch/x86/include/asm/perf_regs_32.h b/arch/x86/include/asm/perf_regs_32.h new file mode 100644 index 0000000..8201750 --- /dev/null +++ b/arch/x86/include/asm/perf_regs_32.h @@ -0,0 +1,84 @@ +#ifndef _ASM_X86_PERF_REGS_32_H +#define _ASM_X86_PERF_REGS_32_H + +enum perf_event_x86_32_regs { + PERF_X86_32_REG_EAX, + PERF_X86_32_REG_EBX, + PERF_X86_32_REG_ECX, + PERF_X86_32_REG_EDX, + PERF_X86_32_REG_ESI, + PERF_X86_32_REG_EDI, + PERF_X86_32_REG_EBP, + PERF_X86_32_REG_ESP, + PERF_X86_32_REG_EIP, + PERF_X86_32_REG_FLAGS, + PERF_X86_32_REG_CS, + PERF_X86_32_REG_DS, + PERF_X86_32_REG_ES, + PERF_X86_32_REG_FS, + PERF_X86_32_REG_GS, + + /* Non ABI */ + PERF_X86_32_REG_MAX, +}; + +enum { + PERF_REGS_ABI_X86_32 = 1UL +}; + +static inline u64 perf_reg_version(void) +{ + return PERF_REGS_ABI_X86_32; +} + +#ifdef __KERNEL__ +#define PERF_X86_32_REG_RESERVED (~((1ULL << PERF_X86_32_REG_MAX) - 1ULL)) + +static inline int perf_reg_validate(u64 mask) +{ + if (mask & PERF_X86_32_REG_RESERVED) + return -EINVAL; + + return 0; +} + +static inline u64 perf_reg_value(struct pt_regs *regs, int idx) +{ + switch (idx) { + case PERF_X86_32_REG_EAX: + return regs->ax; + case PERF_X86_32_REG_EBX: + return regs->bx; + case PERF_X86_32_REG_ECX: + return regs->cx; + case PERF_X86_32_REG_EDX: + return regs->dx; + case PERF_X86_32_REG_ESI: + return regs->si; + case PERF_X86_32_REG_EDI: + return regs->di; + case PERF_X86_32_REG_EBP: + return regs->bp; + case PERF_X86_32_REG_ESP: + return regs->sp; + case PERF_X86_32_REG_EIP: + return regs->ip; + case PERF_X86_32_REG_FLAGS: + return regs->flags; + case PERF_X86_32_REG_CS: + return regs->cs; + case PERF_X86_32_REG_DS: + return regs->ds; + case PERF_X86_32_REG_ES: + return regs->es; + case PERF_X86_32_REG_FS: + return regs->fs; + case PERF_X86_32_REG_GS: + return regs->gs; + } + + return 0; +} + +#endif /* __KERNEL__ */ +#endif /* _ASM_X86_PERF_REGS_32_H */ diff --git a/arch/x86/include/asm/perf_regs_64.h b/arch/x86/include/asm/perf_regs_64.h new file mode 100644 index 0000000..63d7f1f --- /dev/null +++ b/arch/x86/include/asm/perf_regs_64.h @@ -0,0 +1,99 @@ +#ifndef _ASM_X86_PERF_REGS_64_H +#define _ASM_X86_PERF_REGS_64_H + +enum perf_event_x86_64_regs { + PERF_X86_64_REG_RAX, + PERF_X86_64_REG_RBX, + PERF_X86_64_REG_RCX, + PERF_X86_64_REG_RDX, + PERF_X86_64_REG_RSI, + PERF_X86_64_REG_RDI, + PERF_X86_64_REG_R8, + PERF_X86_64_REG_R9, + PERF_X86_64_REG_R10, + PERF_X86_64_REG_R11, + PERF_X86_64_REG_R12, + PERF_X86_64_REG_R13, + PERF_X86_64_REG_R14, + PERF_X86_64_REG_R15, + PERF_X86_64_REG_RBP, + PERF_X86_64_REG_RSP, + PERF_X86_64_REG_RIP, + PERF_X86_64_REG_FLAGS, + PERF_X86_64_REG_CS, + PERF_X86_64_REG_SS, + + /* Non ABI */ + PERF_X86_64_REG_MAX, +}; + +enum { + PERF_REGS_ABI_X86_64 = 2UL +}; + +static inline u64 perf_reg_version(void) +{ + return PERF_REGS_ABI_X86_64; +} + +#ifdef __KERNEL__ +#define PERF_X86_64_REG_RESERVED (~((1ULL << PERF_X86_64_REG_MAX) - 1ULL)) + +static inline int perf_reg_validate(u64 mask) +{ + if (mask & PERF_X86_64_REG_RESERVED) + return -EINVAL; + + return 0; +} + +static inline u64 perf_reg_value(struct pt_regs *regs, int idx) +{ + switch (idx) { + case PERF_X86_64_REG_RAX: + return regs->ax; + case PERF_X86_64_REG_RBX: + return regs->bx; + case PERF_X86_64_REG_RCX: + return regs->cx; + case PERF_X86_64_REG_RDX: + return regs->dx; + case PERF_X86_64_REG_RSI: + return regs->si; + case PERF_X86_64_REG_RDI: + return regs->di; + case PERF_X86_64_REG_R8: + return regs->r8; + case PERF_X86_64_REG_R9: + return regs->r9; + case PERF_X86_64_REG_R10: + return regs->r10; + case PERF_X86_64_REG_R11: + return regs->r11; + case PERF_X86_64_REG_R12: + return regs->r12; + case PERF_X86_64_REG_R13: + return regs->r13; + case PERF_X86_64_REG_R14: + return regs->r14; + case PERF_X86_64_REG_R15: + return regs->r15; + case PERF_X86_64_REG_RBP: + return regs->bp; + case PERF_X86_64_REG_RSP: + return regs->sp; + case PERF_X86_64_REG_RIP: + return regs->ip; + case PERF_X86_64_REG_FLAGS: + return regs->flags; + case PERF_X86_64_REG_CS: + return regs->cs; + case PERF_X86_64_REG_SS: + return regs->ss; + } + + return 0; +} + +#endif /* __KERNEL__ */ +#endif /* _ASM_X86_PERF_REGS_64_H */ diff --git a/include/linux/perf_regs.h b/include/linux/perf_regs.h new file mode 100644 index 0000000..3d761d5 --- /dev/null +++ b/include/linux/perf_regs.h @@ -0,0 +1,28 @@ +#ifndef _LINUX_PERF_REGS_H +#define _LINUX_PERF_REGS_H + +enum { + PERF_REGS_ABI_NONE = 0UL, +}; + +#ifdef CONFIG_HAVE_PERF_REGS +#include <asm/perf_regs.h> +#else +static inline unsigned long perf_reg_version(void) +{ + return PERF_REGS_ABI_NONE; +} + +#ifdef __KERNEL__ +static inline unsigned long perf_reg_value(struct pt_regs *regs, int idx) +{ + return 0; +} + +static inline int perf_reg_validate(u64 mask) +{ + return mask ? -ENOSYS : 0; +} +#endif /* __KERNEL__ */ +#endif /* CONFIG_HAVE_PERF_REGS */ +#endif /* __ASM_GENERIC_PERF_REGS_H */ -- 1.7.7.6 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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