• Kan Liang's avatar
    perf/x86: Support outputting XMM registers · 878068ea
    Kan Liang authored
    Starting from Icelake, XMM registers can be collected in PEBS record.
    But current code only output the pt_regs.
    
    Add a new struct x86_perf_regs for both pt_regs and xmm_regs. The
    xmm_regs will be used later to keep a pointer to PEBS record which has
    XMM information.
    
    XMM registers are 128 bit. To simplify the code, they are handled like
    two different registers, which means setting two bits in the register
    bitmap. This also allows only sampling the lower 64bit bits in XMM.
    
    The index of XMM registers starts from 32. There are 16 XMM registers.
    So all reserved space for regs are used. Remove REG_RESERVED.
    
    Add PERF_REG_X86_XMM_MAX, which stands for the max number of all x86
    regs including both GPRs and XMM.
    
    Add REG_NOSUPPORT for 32bit to exclude unsupported registers.
    
    Previous platforms can not collect XMM information in PEBS record.
    Adding pebs_no_xmm_regs to indicate the unsupported platforms.
    
    The common code still validates the supported registers. However, it
    cannot check model specific registers, e.g. XMM. Add extra check in
    x86_pmu_hw_config() to reject invalid config of regs_user and regs_intr.
    The regs_user never supports XMM collection.
    The regs_intr only supports XMM collection when sampling PEBS event on
    icelake and later platforms.
    Originally-by: default avatarAndi Kleen <ak@linux.intel.com>
    Suggested-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
    Signed-off-by: default avatarKan Liang <kan.liang@linux.intel.com>
    Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
    Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
    Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Jiri Olsa <jolsa@redhat.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Stephane Eranian <eranian@google.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Vince Weaver <vincent.weaver@maine.edu>
    Cc: acme@kernel.org
    Cc: jolsa@kernel.org
    Link: https://lkml.kernel.org/r/20190402194509.2832-3-kan.liang@linux.intel.comSigned-off-by: default avatarIngo Molnar <mingo@kernel.org>
    878068ea
perf_event.h 28.6 KB