On Fri, Feb 13, 2015 at 06:24:09PM +0000, Stephen Boyd wrote: > Scorpion supports a set of local performance monitor event > selection registers (LPM) sitting behind a cp15 based interface > that extend the architected PMU events to include Scorpion CPU > and Venum VFP specific events. To use these events the user is > expected to program the lpm register with the event code shifted > into the group they care about and then point the PMNx event at > that region+group combo by writing a LPMn_GROUPx event. Add > support for this hardware. > > Note: the raw event number is a pure software construct that > allows us to map the multi-dimensional number space of regions, > groups, and event codes into a flat event number space suitable > for use by the perf framework. > > This is based on code originally written by Ashwin Chaugule and > Neil Leeder [1] massaged to become similar to the Krait PMU > support code. > > [1] https://www.codeaurora.org/cgit/quic/la/kernel/msm/tree/arch/arm/kernel/perf_event_msm.c?h=msm-3.4 > > Cc: Mark Rutland <mark.rutland@xxxxxxx> > Cc: Neil Leeder <nleeder@xxxxxxxxxxxxxx> > Cc: Ashwin Chaugule <ashwinc@xxxxxxxxxxxxxx> > Cc: <devicetree@xxxxxxxxxxxxxxx> > Signed-off-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx> > --- > Documentation/devicetree/bindings/arm/pmu.txt | 2 + > arch/arm/kernel/perf_event_cpu.c | 2 + > arch/arm/kernel/perf_event_v7.c | 417 ++++++++++++++++++++++++++ > 3 files changed, 421 insertions(+) [...] > +static void scorpion_evt_setup(int idx, u32 config_base) > +{ > + u32 val; > + u32 mask; > + u32 vval, fval; > + unsigned int region; > + unsigned int group; > + unsigned int code; > + unsigned int group_shift; > + bool venum_event; > + > + krait_decode_event(config_base, ®ion, &group, &code, &venum_event, > + NULL); > + > + group_shift = group * 8; > + mask = 0xff << group_shift; > + > + /* Configure evtsel for the region and group */ > + if (venum_event) > + val = SCORPION_VLPM_GROUP0; > + else > + val = scorpion_get_pmresrn_event(region); > + val += group; > + /* Mix in mode-exclusion bits */ > + val |= config_base & (ARMV7_EXCLUDE_USER | ARMV7_EXCLUDE_PL1); > + armv7_pmnc_write_evtsel(idx, val); > + > + asm volatile("mcr p15, 0, %0, c9, c15, 0" : : "r" (0)); What's this guy doing? > +static int scorpion_pmu_get_event_idx(struct pmu_hw_events *cpuc, > + struct perf_event *event) > +{ > + int idx; > + int bit = -1; > + unsigned int region; > + unsigned int code; > + unsigned int group; > + bool venum_event, scorpion_event; > + struct hw_perf_event *hwc = &event->hw; > + > + krait_decode_event(hwc->config_base, ®ion, &group, &code, > + &venum_event, &scorpion_event); > + > + if (venum_event || scorpion_event) { > + /* Ignore invalid events */ > + if (group > 3 || region > 3) Where does the 3 come from? Will -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
