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Date: Mon, 10 Aug 2015 14:02:17 +0000
From: "Liang, Kan" <kan.liang@...el.com>
To: Peter Zijlstra <peterz@...radead.org>,
Andy Lutomirski <luto@...capital.net>
CC: Thomas Gleixner <tglx@...utronix.de>,
"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"H. Peter Anvin" <hpa@...or.com>,
"Andrew Lutomirski" <luto@...nel.org>,
Linus Torvalds <torvalds@...ux-foundation.org>,
Ingo Molnar <mingo@...nel.org>,
"linux-tip-commits@...r.kernel.org"
<linux-tip-commits@...r.kernel.org>
Subject: RE: [tip:perf/core] perf/x86: Add an MSR PMU driver
> On Thu, Aug 06, 2015 at 05:59:43PM +0200, Peter Zijlstra wrote:
> > On Thu, Aug 06, 2015 at 08:30:08AM -0700, Andy Lutomirski wrote:
> > > On Thu, Aug 6, 2015 at 8:21 AM, Peter Zijlstra <peterz@...radead.org>
> wrote:
> > > > On Tue, Aug 04, 2015 at 08:39:27PM +0000, Liang, Kan wrote:
> > > > - default:
> > > > - err = -ENOTSUPP;
> > > > + if (!msr[i].test() || rdmsrl_safe(msr[i].msr, &val))
> > > > + msr[i].attr = NULL;
> > >
> > > IIRC rdmsrl_safe literally never fails under QEMU TCG, and I'm not
> >
> > *sigh* the borkage never stops does it :-(
> >
> > > entirely sure what happens under KVM if emulation kicks in. It
> > > might pay to keep the model check for the non-architectural stuff,
> > > or at least check for a nonzero return value.
> >
> > Of course, 0 might be a valid value.. Esp. for the SMI counter.
>
> This then..
>
> ---
> arch/x86/kernel/cpu/perf_event_msr.c | 170 +++++++++++++++++-------
> -----------
> 1 file changed, 85 insertions(+), 85 deletions(-)
>
> --- a/arch/x86/kernel/cpu/perf_event_msr.c
> +++ b/arch/x86/kernel/cpu/perf_event_msr.c
> @@ -10,17 +10,63 @@ enum perf_msr_id {
> PERF_MSR_EVENT_MAX,
> };
>
> +bool test_aperfmperf(int idx)
> +{
> + return boot_cpu_has(X86_FEATURE_APERFMPERF);
> +}
> +
> +bool test_intel(int idx)
> +{
> + if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL ||
> + boot_cpu_data.x86 != 6)
> + return false;
> +
> + switch (boot_cpu_data.x86_model) {
> + case 30: /* 45nm Nehalem */
> + case 26: /* 45nm Nehalem-EP */
> + case 46: /* 45nm Nehalem-EX */
> +
> + case 37: /* 32nm Westmere */
> + case 44: /* 32nm Westmere-EP */
> + case 47: /* 32nm Westmere-EX */
> +
> + case 42: /* 32nm SandyBridge */
> + case 45: /* 32nm SandyBridge-E/EN/EP */
> +
> + case 58: /* 22nm IvyBridge */
> + case 62: /* 22nm IvyBridge-EP/EX */
> +
> + case 60: /* 22nm Haswell Core */
> + case 63: /* 22nm Haswell Server */
> + case 69: /* 22nm Haswell ULT */
> + case 70: /* 22nm Haswell + GT3e (Intel Iris Pro graphics) */
> +
> + case 61: /* 14nm Broadwell Core-M */
> + case 86: /* 14nm Broadwell Xeon D */
> + case 71: /* 14nm Broadwell + GT3e (Intel Iris Pro graphics) */
> + case 79: /* 14nm Broadwell Server */
> +
> + case 55: /* 22nm Atom "Silvermont" */
> + case 77: /* 22nm Atom "Silvermont Avoton/Rangely" */
> + case 76: /* 14nm Atom "Airmont" */
> + if (idx == PERF_MSR_SMI)
> + return true;
> + break;
> +
> + case 78: /* 14nm Skylake Mobile */
> + case 94: /* 14nm Skylake Desktop */
> + if (idx == PERF_MSR_SMI || idx = PERF_MSR_PPERF)
Here is a typo. The rest is OK for me.
I did some simple test on HSX.
Tested-by: Kan Liang <kan.liang@...el.com>
> + return true;
> + break;
> + }
> +
> + return false;
> +}
> +
> struct perf_msr {
> - int id;
> u64 msr;
> -};
> -
> -static struct perf_msr msr[] = {
> - { PERF_MSR_TSC, 0 },
> - { PERF_MSR_APERF, MSR_IA32_APERF },
> - { PERF_MSR_MPERF, MSR_IA32_MPERF },
> - { PERF_MSR_PPERF, MSR_PPERF },
> - { PERF_MSR_SMI, MSR_SMI_COUNT },
> + struct perf_pmu_events_attr *attr;
> + bool (*test)(int idx);
> };
>
> PMU_EVENT_ATTR_STRING(tsc, evattr_tsc, "event=0x00");
> @@ -29,8 +75,16 @@ PMU_EVENT_ATTR_STRING(mperf, evattr_mper
> PMU_EVENT_ATTR_STRING(pperf, evattr_pperf, "event=0x03");
> PMU_EVENT_ATTR_STRING(smi, evattr_smi, "event=0x04");
>
> +static struct perf_msr msr[] = {
> + [PERF_MSR_TSC] = { 0, &evattr_tsc,
> NULL, },
> + [PERF_MSR_APERF] = { MSR_IA32_APERF, &evattr_aperf,
> test_aperfmperf, },
> + [PERF_MSR_MPERF] = { MSR_IA32_MPERF, &evattr_mperf,
> test_aperfmperf, },
> + [PERF_MSR_PPERF] = { MSR_PPERF, &evattr_pperf,
> test_intel, },
> + [PERF_MSR_SMI] = { MSR_SMI_COUNT, &evattr_smi,
> test_intel, },
> +};
> +
> static struct attribute *events_attrs[PERF_MSR_EVENT_MAX + 1] = {
> - &evattr_tsc.attr.attr,
> + NULL,
> };
>
> static struct attribute_group events_attr_group = { @@ -74,6 +128,9 @@
> static int msr_event_init(struct perf_ev
> event->attr.sample_period) /* no sampling */
> return -EINVAL;
>
> + if (!msr[cfg].attr)
> + return -EINVAL;
> +
> event->hw.idx = -1;
> event->hw.event_base = msr[cfg].msr;
> event->hw.config = cfg;
> @@ -151,89 +208,32 @@ static struct pmu pmu_msr = {
> .capabilities = PERF_PMU_CAP_NO_INTERRUPT,
> };
>
> -static int __init intel_msr_init(int idx) -{
> - if (boot_cpu_data.x86 != 6)
> - return 0;
> -
> - switch (boot_cpu_data.x86_model) {
> - case 30: /* 45nm Nehalem */
> - case 26: /* 45nm Nehalem-EP */
> - case 46: /* 45nm Nehalem-EX */
> -
> - case 37: /* 32nm Westmere */
> - case 44: /* 32nm Westmere-EP */
> - case 47: /* 32nm Westmere-EX */
> -
> - case 42: /* 32nm SandyBridge */
> - case 45: /* 32nm SandyBridge-E/EN/EP */
> -
> - case 58: /* 22nm IvyBridge */
> - case 62: /* 22nm IvyBridge-EP/EX */
> -
> - case 60: /* 22nm Haswell Core */
> - case 63: /* 22nm Haswell Server */
> - case 69: /* 22nm Haswell ULT */
> - case 70: /* 22nm Haswell + GT3e (Intel Iris Pro graphics) */
> -
> - case 61: /* 14nm Broadwell Core-M */
> - case 86: /* 14nm Broadwell Xeon D */
> - case 71: /* 14nm Broadwell + GT3e (Intel Iris Pro graphics) */
> - case 79: /* 14nm Broadwell Server */
> - events_attrs[idx++] = &evattr_smi.attr.attr;
> - break;
> -
> - case 78: /* 14nm Skylake Mobile */
> - case 94: /* 14nm Skylake Desktop */
> - events_attrs[idx++] = &evattr_pperf.attr.attr;
> - events_attrs[idx++] = &evattr_smi.attr.attr;
> - break;
> -
> - case 55: /* 22nm Atom "Silvermont" */
> - case 76: /* 14nm Atom "Airmont" */
> - case 77: /* 22nm Atom "Silvermont Avoton/Rangely" */
> - events_attrs[idx++] = &evattr_smi.attr.attr;
> - break;
> - }
> -
> - events_attrs[idx] = NULL;
> -
> - return 0;
> -}
> -
> -static int __init amd_msr_init(int idx) -{
> - return 0;
> -}
> -
> static int __init msr_init(void)
> {
> - int err;
> - int idx = 1;
> + int i, j = 0;
>
> - if (boot_cpu_has(X86_FEATURE_APERFMPERF)) {
> - events_attrs[idx++] = &evattr_aperf.attr.attr;
> - events_attrs[idx++] = &evattr_mperf.attr.attr;
> - events_attrs[idx] = NULL;
> + if (!boot_cpu_has(X86_FEATURE_TSC)) {
> + pr_cont("no MSR PMU driver.\n");
> + return 0;
> }
>
> - switch (boot_cpu_data.x86_vendor) {
> - case X86_VENDOR_INTEL:
> - err = intel_msr_init(idx);
> - break;
> -
> - case X86_VENDOR_AMD:
> - err = amd_msr_init(idx);
> - break;
> -
> - default:
> - err = -ENOTSUPP;
> + /* Probe the MSRs. */
> + for (i = PERF_MSR_TSC + 1; i < PERF_MSR_EVENT_MAX; i++) {
> + u64 val;
> +
> + /*
> + * Virt sucks arse; you cannot tell if a R/O MSR is present :/
> + */
> + if (!msr[i].test(i) || rdmsrl_safe(msr[i].msr, &val))
> + msr[i].attr = NULL;
> }
>
> - if (err != 0) {
> - pr_cont("no msr PMU driver.\n");
> - return 0;
> + /* List remaining MSRs in the sysfs attrs. */
> + for (i = 0; i < PERF_MSR_EVENT_MAX; i++) {
> + if (msr[i].attr)
> + events_attrs[j++] = &msr[i].attr->attr.attr;
> }
> + events_attrs[j] = NULL;
>
> perf_pmu_register(&pmu_msr, "msr", -1);
>
--
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