Commit-ID: 1039b306b1c68c2b4183b22a131c5f031dfedc2b Gitweb: http://git.kernel.org/tip/1039b306b1c68c2b4183b22a131c5f031dfedc2b Author: Hans Rosenfeld <hans.rosenfeld@xxxxxxx> AuthorDate: Tue, 5 Apr 2011 17:50:55 +0200 Committer: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx> CommitDate: Wed, 6 Apr 2011 14:15:20 -0700 x86, xsave: add kernel support for AMDs Lightweight Profiling (LWP) This patch extends the xsave structure to support the LWP state. The xstate feature bit for LWP is added to XCNTXT_NONLAZY, thereby enabling kernel support for saving/restoring LWP state. The LWP state is also saved/restored on signal entry/return, just like all other xstates. LWP state needs to be reset (disabled) when entering a signal handler. Signed-off-by: Hans Rosenfeld <hans.rosenfeld@xxxxxxx> Link: http://lkml.kernel.org/r/1302018656-586370-8-git-send-email-hans.rosenfeld@xxxxxxx Signed-off-by: H. Peter Anvin <hpa@xxxxxxxxxxxxxxx> --- arch/x86/include/asm/msr-index.h | 1 + arch/x86/include/asm/processor.h | 12 ++++++++++++ arch/x86/include/asm/sigcontext.h | 12 ++++++++++++ arch/x86/include/asm/xsave.h | 3 ++- arch/x86/kernel/xsave.c | 2 ++ 5 files changed, 29 insertions(+), 1 deletions(-) diff --git a/arch/x86/include/asm/msr-index.h b/arch/x86/include/asm/msr-index.h index fd5a1f3..55edab6 100644 --- a/arch/x86/include/asm/msr-index.h +++ b/arch/x86/include/asm/msr-index.h @@ -131,6 +131,7 @@ #define MSR_AMD64_IBSDCPHYSAD 0xc0011039 #define MSR_AMD64_IBSCTL 0xc001103a #define MSR_AMD64_IBSBRTARGET 0xc001103b +#define MSR_AMD64_LWP_CBADDR 0xc0000106 /* Fam 15h MSRs */ #define MSR_F15H_PERF_CTL 0xc0010200 diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h index 4c25ab4..df2cbd4 100644 --- a/arch/x86/include/asm/processor.h +++ b/arch/x86/include/asm/processor.h @@ -353,6 +353,17 @@ struct ymmh_struct { u32 ymmh_space[64]; }; +struct lwp_struct { + u64 lwpcb_addr; + u32 flags; + u32 buf_head_offset; + u64 buf_base; + u32 buf_size; + u32 filters; + u64 saved_event_record[4]; + u32 event_counter[16]; +}; + struct xsave_hdr_struct { u64 xstate_bv; u64 reserved1[2]; @@ -363,6 +374,7 @@ struct xsave_struct { struct i387_fxsave_struct i387; struct xsave_hdr_struct xsave_hdr; struct ymmh_struct ymmh; + struct lwp_struct lwp; /* new processor state extensions will go here */ } __attribute__ ((packed, aligned (64))); diff --git a/arch/x86/include/asm/sigcontext.h b/arch/x86/include/asm/sigcontext.h index 04459d2..0a58b82 100644 --- a/arch/x86/include/asm/sigcontext.h +++ b/arch/x86/include/asm/sigcontext.h @@ -274,6 +274,17 @@ struct _ymmh_state { __u32 ymmh_space[64]; }; +struct _lwp_state { + __u64 lwpcb_addr; + __u32 flags; + __u32 buf_head_offset; + __u64 buf_base; + __u32 buf_size; + __u32 filters; + __u64 saved_event_record[4]; + __u32 event_counter[16]; +}; + /* * Extended state pointed by the fpstate pointer in the sigcontext. * In addition to the fpstate, information encoded in the xstate_hdr @@ -284,6 +295,7 @@ struct _xstate { struct _fpstate fpstate; struct _xsave_hdr xstate_hdr; struct _ymmh_state ymmh; + struct _lwp_state lwp; /* new processor state extensions go here */ }; diff --git a/arch/x86/include/asm/xsave.h b/arch/x86/include/asm/xsave.h index 4ccee3c..be89f0e 100644 --- a/arch/x86/include/asm/xsave.h +++ b/arch/x86/include/asm/xsave.h @@ -9,6 +9,7 @@ #define XSTATE_FP 0x1 #define XSTATE_SSE 0x2 #define XSTATE_YMM 0x4 +#define XSTATE_LWP (1ULL << 62) #define XSTATE_FPSSE (XSTATE_FP | XSTATE_SSE) @@ -24,7 +25,7 @@ * These are the features that the OS can handle currently. */ #define XCNTXT_LAZY (XSTATE_FP | XSTATE_SSE | XSTATE_YMM) -#define XCNTXT_NONLAZY 0 +#define XCNTXT_NONLAZY (XSTATE_LWP) #define XCNTXT_MASK (XCNTXT_LAZY | XCNTXT_NONLAZY) diff --git a/arch/x86/kernel/xsave.c b/arch/x86/kernel/xsave.c index 56ab3d3..a188362 100644 --- a/arch/x86/kernel/xsave.c +++ b/arch/x86/kernel/xsave.c @@ -177,6 +177,8 @@ int save_xstates_sigframe(void __user *buf, unsigned int size) (struct _fpstate_ia32 __user *) buf) ? -1 : 1; save_xstates(tsk); + if (pcntxt_mask & XSTATE_LWP) + wrmsrl(MSR_AMD64_LWP_CBADDR, 0); if (use_xsaveopt()) sanitize_i387_state(tsk); -- To unsubscribe from this list: send the line "unsubscribe linux-tip-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html