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Date: Wed, 6 May 2020 20:55:54 +0800
From: CodyYao-oc <CodyYao-oc@...oxin.com>
To: Peter Zijlstra <peterz@...radead.org>
CC: <mingo@...hat.com>, <acme@...nel.org>, <mark.rutland@....com>,
<alexander.shishkin@...ux.intel.com>, <jolsa@...hat.com>,
<namhyung@...nel.org>, <tglx@...utronix.de>, <bp@...en8.de>,
<x86@...nel.org>, <hpa@...or.com>, <linux-kernel@...r.kernel.org>,
<cooperyan@...oxin.com>, <codyyao@...oxin.com>
Subject: Re: [PATCH] x86/perf: Add hardware performance events support for
Zhaoxin CPU.
On 2020/4/15 下午6:31, Peter Zijlstra wrote:
> On Wed, Apr 15, 2020 at 12:23:40PM +0200, Peter Zijlstra wrote:
>> On Mon, Apr 13, 2020 at 11:14:29AM +0800, CodyYao-oc wrote:
>>> Zhaoxin CPU has provided facilities for monitoring performance
>>> via PMU(Performance Monitor Unit), but the functionality is unused so far.
>>> Therefore, add support for zhaoxin pmu to make performance related
>>> hardware events available.
>>>
>>> Signed-off-by: CodyYao-oc <CodyYao-oc@...oxin.com>
>>> Reported-by: kbuild test robot <lkp@...el.com>
>>
>> What's that reported-by thing? Did the robot complain you didn't have a
>> PMU implementation?
>>
>> Anyway, I've made the below changes to the patch.
>
> In whole, the patch now looks like this. I've also added that event
> table you provided last time to the Changelog.
>
> ---
> Subject: x86/perf: Add hardware performance events support for Zhaoxin CPU.
> From: CodyYao-oc <CodyYao-oc@...oxin.com>
> Date: Mon, 13 Apr 2020 11:14:29 +0800
>
> From: CodyYao-oc <CodyYao-oc@...oxin.com>
>
> Zhaoxin CPU has provided facilities for monitoring performance
> via PMU (Performance Monitor Unit), but the functionality is unused so far.
> Therefore, add support for zhaoxin pmu to make performance related
> hardware events available.
>
> The PMU is mostly an Intel Architectural PerfMon-v2 with a novel
> errata for the ZXC line. It supports the following events:
>
> -----------------------------------------------------------------------------------------------------------------------------------
> Event | Event | Umask | Description
> | Select | |
> -----------------------------------------------------------------------------------------------------------------------------------
> cpu-cycles | 82h | 00h | unhalt core clock
> instructions | 00h | 00h | number of instructions at retirement.
> cache-references | 15h | 05h | number of fillq pushs at the current cycle.
> cache-misses | 1ah | 05h | number of l2 miss pushed by fillq.
> branch-instructions | 28h | 00h | counts the number of branch instructions retired.
> branch-misses | 29h | 00h | mispredicted branch instructions at retirement.
> bus-cycles | 83h | 00h | unhalt bus clock
> stalled-cycles-frontend | 01h | 01h | Increments each cycle the # of Uops issued by the RAT to RS.
> stalled-cycles-backend | 0fh | 04h | RS0/1/2/3/45 empty
> L1-dcache-loads | 68h | 05h | number of retire/commit load.
> L1-dcache-load-misses | 4bh | 05h | retired load uops whose data source followed an L1 miss.
> L1-dcache-stores | 69h | 06h | number of retire/commit Store,no LEA
> L1-dcache-store-misses | 62h | 05h | cache lines in M state evicted out of L1D due to Snoop HitM or dirty line replacement.
> L1-icache-loads | 00h | 03h | number of l1i cache access for valid normal fetch,including un-cacheable access.
> L1-icache-load-misses | 01h | 03h | number of l1i cache miss for valid normal fetch,including un-cacheable miss.
> L1-icache-prefetches | 0ah | 03h | number of prefetch.
> L1-icache-prefetch-misses | 0bh | 03h | number of prefetch miss.
> dTLB-loads | 68h | 05h | number of retire/commit load
> dTLB-load-misses | 2ch | 05h | number of load operations miss all level tlbs and cause a tablewalk.
> dTLB-stores | 69h | 06h | number of retire/commit Store,no LEA
> dTLB-store-misses | 30h | 05h | number of store operations miss all level tlbs and cause a tablewalk.
> dTLB-prefetches | 64h | 05h | number of hardware pte prefetch requests dispatched out of the prefetch FIFO.
> dTLB-prefetch-misses | 65h | 05h | number of hardware pte prefetch requests miss the l1d data cache.
> iTLB-load | 00h | 00h | actually counter instructions.
> iTLB-load-misses | 34h | 05h | number of code operations miss all level tlbs and cause a tablewalk.
> -----------------------------------------------------------------------------------------------------------------------------------
>
> Reported-by: kbuild test robot <lkp@...el.com>
> Signed-off-by: CodyYao-oc <CodyYao-oc@...oxin.com>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
> Link: https://lkml.kernel.org/r/1586747669-4827-1-git-send-email-CodyYao-oc@zhaoxin.com
> ---
> arch/x86/events/Makefile | 2
> arch/x86/events/core.c | 4
> arch/x86/events/perf_event.h | 10
> arch/x86/events/zhaoxin/Makefile | 2
> arch/x86/events/zhaoxin/core.c | 613 +++++++++++++++++++++++++++++++++
> arch/x86/kernel/cpu/perfctr-watchdog.c | 8
> 6 files changed, 639 insertions(+)
> create mode 100644 arch/x86/events/zhaoxin/Makefile
> create mode 100644 arch/x86/events/zhaoxin/core.c
>
> --- a/arch/x86/events/Makefile
> +++ b/arch/x86/events/Makefile
> @@ -3,3 +3,5 @@ obj-y += core.o probe.o
> obj-y += amd/
> obj-$(CONFIG_X86_LOCAL_APIC) += msr.o
> obj-$(CONFIG_CPU_SUP_INTEL) += intel/
> +obj-$(CONFIG_CPU_SUP_CENTAUR) += zhaoxin/
> +obj-$(CONFIG_CPU_SUP_ZHAOXIN) += zhaoxin/
> --- a/arch/x86/events/core.c
> +++ b/arch/x86/events/core.c
> @@ -1839,6 +1839,10 @@ static int __init init_hw_perf_events(vo
> err = amd_pmu_init();
> x86_pmu.name = "HYGON";
> break;
> + case X86_VENDOR_ZHAOXIN:
> + case X86_VENDOR_CENTAUR:
> + err = zhaoxin_pmu_init();
> + break;
> default:
> err = -ENOTSUPP;
> }
> --- a/arch/x86/events/perf_event.h
> +++ b/arch/x86/events/perf_event.h
> @@ -618,6 +618,7 @@ struct x86_pmu {
>
> /* PMI handler bits */
> unsigned int late_ack :1,
> + enabled_ack :1,
> counter_freezing :1;
> /*
> * sysfs attrs
> @@ -1133,3 +1134,12 @@ static inline int is_ht_workaround_enabl
> return 0;
> }
> #endif /* CONFIG_CPU_SUP_INTEL */
> +
> +#if ((defined CONFIG_CPU_SUP_CENTAUR) || (defined CONFIG_CPU_SUP_ZHAOXIN))
> +int zhaoxin_pmu_init(void);
> +#else
> +static inline int zhaoxin_pmu_init(void)
> +{
> + return 0;
> +}
> +#endif /*CONFIG_CPU_SUP_CENTAUR or CONFIG_CPU_SUP_ZHAOXIN*/
> --- /dev/null
> +++ b/arch/x86/events/zhaoxin/Makefile
> @@ -0,0 +1,2 @@
> +# SPDX-License-Identifier: GPL-2.0
> +obj-y += core.o
> --- /dev/null
> +++ b/arch/x86/events/zhaoxin/core.c
> @@ -0,0 +1,613 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * Zhoaxin PMU; like Intel Architectural PerfMon-v2
> + */
> +
> +#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
> +
> +#include <linux/stddef.h>
> +#include <linux/types.h>
> +#include <linux/init.h>
> +#include <linux/slab.h>
> +#include <linux/export.h>
> +#include <linux/nmi.h>
> +
> +#include <asm/cpufeature.h>
> +#include <asm/hardirq.h>
> +#include <asm/apic.h>
> +
> +#include "../perf_event.h"
> +
> +/*
> + * Zhaoxin PerfMon, used on zxc and later.
> + */
> +static u64 zx_pmon_event_map[PERF_COUNT_HW_MAX] __read_mostly = {
> +
> + [PERF_COUNT_HW_CPU_CYCLES] = 0x0082,
> + [PERF_COUNT_HW_INSTRUCTIONS] = 0x00c0,
> + [PERF_COUNT_HW_CACHE_REFERENCES] = 0x0515,
> + [PERF_COUNT_HW_CACHE_MISSES] = 0x051a,
> + [PERF_COUNT_HW_BUS_CYCLES] = 0x0083,
> +};
> +
> +static struct event_constraint zxc_event_constraints[] __read_mostly = {
> +
> + FIXED_EVENT_CONSTRAINT(0x0082, 1), /* unhalted core clock cycles */
> + EVENT_CONSTRAINT_END
> +};
> +
> +static struct event_constraint zxd_event_constraints[] __read_mostly = {
> +
> + FIXED_EVENT_CONSTRAINT(0x00c0, 0), /* retired instructions */
> + FIXED_EVENT_CONSTRAINT(0x0082, 1), /* unhalted core clock cycles */
> + FIXED_EVENT_CONSTRAINT(0x0083, 2), /* unhalted bus clock cycles */
> + EVENT_CONSTRAINT_END
> +};
> +
> +static __initconst const u64 zxd_hw_cache_event_ids
> + [PERF_COUNT_HW_CACHE_MAX]
> + [PERF_COUNT_HW_CACHE_OP_MAX]
> + [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
> +[C(L1D)] = {
> + [C(OP_READ)] = {
> + [C(RESULT_ACCESS)] = 0x0042,
> + [C(RESULT_MISS)] = 0x0538,
> + },
> + [C(OP_WRITE)] = {
> + [C(RESULT_ACCESS)] = 0x0043,
> + [C(RESULT_MISS)] = 0x0562,
> + },
> + [C(OP_PREFETCH)] = {
> + [C(RESULT_ACCESS)] = -1,
> + [C(RESULT_MISS)] = -1,
> + },
> +},
> +[C(L1I)] = {
> + [C(OP_READ)] = {
> + [C(RESULT_ACCESS)] = 0x0300,
> + [C(RESULT_MISS)] = 0x0301,
> + },
> + [C(OP_WRITE)] = {
> + [C(RESULT_ACCESS)] = -1,
> + [C(RESULT_MISS)] = -1,
> + },
> + [C(OP_PREFETCH)] = {
> + [C(RESULT_ACCESS)] = 0x030a,
> + [C(RESULT_MISS)] = 0x030b,
> + },
> +},
> +[C(LL)] = {
> + [C(OP_READ)] = {
> + [C(RESULT_ACCESS)] = -1,
> + [C(RESULT_MISS)] = -1,
> + },
> + [C(OP_WRITE)] = {
> + [C(RESULT_ACCESS)] = -1,
> + [C(RESULT_MISS)] = -1,
> + },
> + [C(OP_PREFETCH)] = {
> + [C(RESULT_ACCESS)] = -1,
> + [C(RESULT_MISS)] = -1,
> + },
> +},
> +[C(DTLB)] = {
> + [C(OP_READ)] = {
> + [C(RESULT_ACCESS)] = 0x0042,
> + [C(RESULT_MISS)] = 0x052c,
> + },
> + [C(OP_WRITE)] = {
> + [C(RESULT_ACCESS)] = 0x0043,
> + [C(RESULT_MISS)] = 0x0530,
> + },
> + [C(OP_PREFETCH)] = {
> + [C(RESULT_ACCESS)] = 0x0564,
> + [C(RESULT_MISS)] = 0x0565,
> + },
> +},
> +[C(ITLB)] = {
> + [C(OP_READ)] = {
> + [C(RESULT_ACCESS)] = 0x00c0,
> + [C(RESULT_MISS)] = 0x0534,
> + },
> + [C(OP_WRITE)] = {
> + [C(RESULT_ACCESS)] = -1,
> + [C(RESULT_MISS)] = -1,
> + },
> + [C(OP_PREFETCH)] = {
> + [C(RESULT_ACCESS)] = -1,
> + [C(RESULT_MISS)] = -1,
> + },
> +},
> +[C(BPU)] = {
> + [C(OP_READ)] = {
> + [C(RESULT_ACCESS)] = 0x0700,
> + [C(RESULT_MISS)] = 0x0709,
> + },
> + [C(OP_WRITE)] = {
> + [C(RESULT_ACCESS)] = -1,
> + [C(RESULT_MISS)] = -1,
> + },
> + [C(OP_PREFETCH)] = {
> + [C(RESULT_ACCESS)] = -1,
> + [C(RESULT_MISS)] = -1,
> + },
> +},
> +[C(NODE)] = {
> + [C(OP_READ)] = {
> + [C(RESULT_ACCESS)] = -1,
> + [C(RESULT_MISS)] = -1,
> + },
> + [C(OP_WRITE)] = {
> + [C(RESULT_ACCESS)] = -1,
> + [C(RESULT_MISS)] = -1,
> + },
> + [C(OP_PREFETCH)] = {
> + [C(RESULT_ACCESS)] = -1,
> + [C(RESULT_MISS)] = -1,
> + },
> +},
> +};
> +
> +static __initconst const u64 zxe_hw_cache_event_ids
> + [PERF_COUNT_HW_CACHE_MAX]
> + [PERF_COUNT_HW_CACHE_OP_MAX]
> + [PERF_COUNT_HW_CACHE_RESULT_MAX] = {
> +[C(L1D)] = {
> + [C(OP_READ)] = {
> + [C(RESULT_ACCESS)] = 0x0568,
> + [C(RESULT_MISS)] = 0x054b,
> + },
> + [C(OP_WRITE)] = {
> + [C(RESULT_ACCESS)] = 0x0669,
> + [C(RESULT_MISS)] = 0x0562,
> + },
> + [C(OP_PREFETCH)] = {
> + [C(RESULT_ACCESS)] = -1,
> + [C(RESULT_MISS)] = -1,
> + },
> +},
> +[C(L1I)] = {
> + [C(OP_READ)] = {
> + [C(RESULT_ACCESS)] = 0x0300,
> + [C(RESULT_MISS)] = 0x0301,
> + },
> + [C(OP_WRITE)] = {
> + [C(RESULT_ACCESS)] = -1,
> + [C(RESULT_MISS)] = -1,
> + },
> + [C(OP_PREFETCH)] = {
> + [C(RESULT_ACCESS)] = 0x030a,
> + [C(RESULT_MISS)] = 0x030b,
> + },
> +},
> +[C(LL)] = {
> + [C(OP_READ)] = {
> + [C(RESULT_ACCESS)] = 0x0,
> + [C(RESULT_MISS)] = 0x0,
> + },
> + [C(OP_WRITE)] = {
> + [C(RESULT_ACCESS)] = 0x0,
> + [C(RESULT_MISS)] = 0x0,
> + },
> + [C(OP_PREFETCH)] = {
> + [C(RESULT_ACCESS)] = 0x0,
> + [C(RESULT_MISS)] = 0x0,
> + },
> +},
> +[C(DTLB)] = {
> + [C(OP_READ)] = {
> + [C(RESULT_ACCESS)] = 0x0568,
> + [C(RESULT_MISS)] = 0x052c,
> + },
> + [C(OP_WRITE)] = {
> + [C(RESULT_ACCESS)] = 0x0669,
> + [C(RESULT_MISS)] = 0x0530,
> + },
> + [C(OP_PREFETCH)] = {
> + [C(RESULT_ACCESS)] = 0x0564,
> + [C(RESULT_MISS)] = 0x0565,
> + },
> +},
> +[C(ITLB)] = {
> + [C(OP_READ)] = {
> + [C(RESULT_ACCESS)] = 0x00c0,
> + [C(RESULT_MISS)] = 0x0534,
> + },
> + [C(OP_WRITE)] = {
> + [C(RESULT_ACCESS)] = -1,
> + [C(RESULT_MISS)] = -1,
> + },
> + [C(OP_PREFETCH)] = {
> + [C(RESULT_ACCESS)] = -1,
> + [C(RESULT_MISS)] = -1,
> + },
> +},
> +[C(BPU)] = {
> + [C(OP_READ)] = {
> + [C(RESULT_ACCESS)] = 0x0028,
> + [C(RESULT_MISS)] = 0x0029,
> + },
> + [C(OP_WRITE)] = {
> + [C(RESULT_ACCESS)] = -1,
> + [C(RESULT_MISS)] = -1,
> + },
> + [C(OP_PREFETCH)] = {
> + [C(RESULT_ACCESS)] = -1,
> + [C(RESULT_MISS)] = -1,
> + },
> +},
> +[C(NODE)] = {
> + [C(OP_READ)] = {
> + [C(RESULT_ACCESS)] = -1,
> + [C(RESULT_MISS)] = -1,
> + },
> + [C(OP_WRITE)] = {
> + [C(RESULT_ACCESS)] = -1,
> + [C(RESULT_MISS)] = -1,
> + },
> + [C(OP_PREFETCH)] = {
> + [C(RESULT_ACCESS)] = -1,
> + [C(RESULT_MISS)] = -1,
> + },
> +},
> +};
> +
> +static void zhaoxin_pmu_disable_all(void)
> +{
> + wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL, 0);
> +}
> +
> +static void zhaoxin_pmu_enable_all(int added)
> +{
> + wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL, x86_pmu.intel_ctrl);
> +}
> +
> +static inline u64 zhaoxin_pmu_get_status(void)
> +{
> + u64 status;
> +
> + rdmsrl(MSR_CORE_PERF_GLOBAL_STATUS, status);
> +
> + return status;
> +}
> +
> +static inline void zhaoxin_pmu_ack_status(u64 ack)
> +{
> + wrmsrl(MSR_CORE_PERF_GLOBAL_OVF_CTRL, ack);
> +}
> +
> +static inline void zxc_pmu_ack_status(u64 ack)
> +{
> + /*
> + * ZXC needs global control enabled in order to clear status bits.
> + */
> + zhaoxin_pmu_enable_all(0);
> + zhaoxin_pmu_ack_status(ack);
> + zhaoxin_pmu_disable_all();
> +}
> +
> +static void zhaoxin_pmu_disable_fixed(struct hw_perf_event *hwc)
> +{
> + int idx = hwc->idx - INTEL_PMC_IDX_FIXED;
> + u64 ctrl_val, mask;
> +
> + mask = 0xfULL << (idx * 4);
> +
> + rdmsrl(hwc->config_base, ctrl_val);
> + ctrl_val &= ~mask;
> + wrmsrl(hwc->config_base, ctrl_val);
> +}
> +
> +static void zhaoxin_pmu_disable_event(struct perf_event *event)
> +{
> + struct hw_perf_event *hwc = &event->hw;
> +
> + if (unlikely(hwc->config_base == MSR_ARCH_PERFMON_FIXED_CTR_CTRL)) {
> + zhaoxin_pmu_disable_fixed(hwc);
> + return;
> + }
> +
> + x86_pmu_disable_event(event);
> +}
> +
> +static void zhaoxin_pmu_enable_fixed(struct hw_perf_event *hwc)
> +{
> + int idx = hwc->idx - INTEL_PMC_IDX_FIXED;
> + u64 ctrl_val, bits, mask;
> +
> + /*
> + * Enable IRQ generation (0x8),
> + * and enable ring-3 counting (0x2) and ring-0 counting (0x1)
> + * if requested:
> + */
> + bits = 0x8ULL;
> + if (hwc->config & ARCH_PERFMON_EVENTSEL_USR)
> + bits |= 0x2;
> + if (hwc->config & ARCH_PERFMON_EVENTSEL_OS)
> + bits |= 0x1;
> +
> + bits <<= (idx * 4);
> + mask = 0xfULL << (idx * 4);
> +
> + rdmsrl(hwc->config_base, ctrl_val);
> + ctrl_val &= ~mask;
> + ctrl_val |= bits;
> + wrmsrl(hwc->config_base, ctrl_val);
> +}
> +
> +static void zhaoxin_pmu_enable_event(struct perf_event *event)
> +{
> + struct hw_perf_event *hwc = &event->hw;
> +
> + if (unlikely(hwc->config_base == MSR_ARCH_PERFMON_FIXED_CTR_CTRL)) {
> + zhaoxin_pmu_enable_fixed(hwc);
> + return;
> + }
> +
> + __x86_pmu_enable_event(hwc, ARCH_PERFMON_EVENTSEL_ENABLE);
> +}
> +
> +/*
> + * This handler is triggered by the local APIC, so the APIC IRQ handling
> + * rules apply:
> + */
> +static int zhaoxin_pmu_handle_irq(struct pt_regs *regs)
> +{
> + struct perf_sample_data data;
> + struct cpu_hw_events *cpuc;
> + int handled = 0;
> + u64 status;
> + int bit;
> +
> + cpuc = this_cpu_ptr(&cpu_hw_events);
> + apic_write(APIC_LVTPC, APIC_DM_NMI);
> + zhaoxin_pmu_disable_all();
> + status = zhaoxin_pmu_get_status();
> + if (!status)
> + goto done;
> +
> +again:
> + if (x86_pmu.enabled_ack)
> + zxc_pmu_ack_status(status);
> + else
> + zhaoxin_pmu_ack_status(status);
> +
> + inc_irq_stat(apic_perf_irqs);
> +
> + /*
> + * CondChgd bit 63 doesn't mean any overflow status. Ignore
> + * and clear the bit.
> + */
> + if (__test_and_clear_bit(63, (unsigned long *)&status)) {
> + if (!status)
> + goto done;
> + }
> +
> + for_each_set_bit(bit, (unsigned long *)&status, X86_PMC_IDX_MAX) {
> + struct perf_event *event = cpuc->events[bit];
> +
> + handled++;
> +
> + if (!test_bit(bit, cpuc->active_mask))
> + continue;
> +
> + x86_perf_event_update(event);
> + perf_sample_data_init(&data, 0, event->hw.last_period);
> +
> + if (!x86_perf_event_set_period(event))
> + continue;
> +
> + if (perf_event_overflow(event, &data, regs))
> + x86_pmu_stop(event, 0);
> + }
> +
> + /*
> + * Repeat if there is more work to be done:
> + */
> + status = zhaoxin_pmu_get_status();
> + if (status)
> + goto again;
> +
> +done:
> + zhaoxin_pmu_enable_all(0);
> + return handled;
> +}
> +
> +static u64 zhaoxin_pmu_event_map(int hw_event)
> +{
> + return zx_pmon_event_map[hw_event];
> +}
> +
> +static struct event_constraint *
> +zhaoxin_get_event_constraints(struct cpu_hw_events *cpuc, int idx,
> + struct perf_event *event)
> +{
> + struct event_constraint *c;
> +
> + if (x86_pmu.event_constraints) {
> + for_each_event_constraint(c, x86_pmu.event_constraints) {
> + if ((event->hw.config & c->cmask) == c->code)
> + return c;
> + }
> + }
> +
> + return &unconstrained;
> +}
> +
> +PMU_FORMAT_ATTR(event, "config:0-7");
> +PMU_FORMAT_ATTR(umask, "config:8-15");
> +PMU_FORMAT_ATTR(edge, "config:18");
> +PMU_FORMAT_ATTR(inv, "config:23");
> +PMU_FORMAT_ATTR(cmask, "config:24-31");
> +
> +static struct attribute *zx_arch_formats_attr[] = {
> + &format_attr_event.attr,
> + &format_attr_umask.attr,
> + &format_attr_edge.attr,
> + &format_attr_inv.attr,
> + &format_attr_cmask.attr,
> + NULL,
> +};
> +
> +static ssize_t zhaoxin_event_sysfs_show(char *page, u64 config)
> +{
> + u64 event = (config & ARCH_PERFMON_EVENTSEL_EVENT);
> +
> + return x86_event_sysfs_show(page, config, event);
> +}
> +
> +static const struct x86_pmu zhaoxin_pmu __initconst = {
> + .name = "zhaoxin",
> + .handle_irq = zhaoxin_pmu_handle_irq,
> + .disable_all = zhaoxin_pmu_disable_all,
> + .enable_all = zhaoxin_pmu_enable_all,
> + .enable = zhaoxin_pmu_enable_event,
> + .disable = zhaoxin_pmu_disable_event,
> + .hw_config = x86_pmu_hw_config,
> + .schedule_events = x86_schedule_events,
> + .eventsel = MSR_ARCH_PERFMON_EVENTSEL0,
> + .perfctr = MSR_ARCH_PERFMON_PERFCTR0,
> + .event_map = zhaoxin_pmu_event_map,
> + .max_events = ARRAY_SIZE(zx_pmon_event_map),
> + .apic = 1,
> + /*
> + * For zxd/zxe, read/write operation for PMCx MSR is 48 bits.
> + */
> + .max_period = (1ULL << 47) - 1,
> + .get_event_constraints = zhaoxin_get_event_constraints,
> +
> + .format_attrs = zx_arch_formats_attr,
> + .events_sysfs_show = zhaoxin_event_sysfs_show,
> +};
> +
> +static const struct { int id; char *name; } zx_arch_events_map[] __initconst = {
> + { PERF_COUNT_HW_CPU_CYCLES, "cpu cycles" },
> + { PERF_COUNT_HW_INSTRUCTIONS, "instructions" },
> + { PERF_COUNT_HW_BUS_CYCLES, "bus cycles" },
> + { PERF_COUNT_HW_CACHE_REFERENCES, "cache references" },
> + { PERF_COUNT_HW_CACHE_MISSES, "cache misses" },
> + { PERF_COUNT_HW_BRANCH_INSTRUCTIONS, "branch instructions" },
> + { PERF_COUNT_HW_BRANCH_MISSES, "branch misses" },
> +};
> +
> +static __init void zhaoxin_arch_events_quirk(void)
> +{
> + int bit;
> +
> + /* disable event that reported as not presend by cpuid */
> + for_each_set_bit(bit, x86_pmu.events_mask, ARRAY_SIZE(zx_arch_events_map)) {
> + zx_pmon_event_map[zx_arch_events_map[bit].id] = 0;
> + pr_warn("CPUID marked event: \'%s\' unavailable\n",
> + zx_arch_events_map[bit].name);
> + }
> +}
> +
> +__init int zhaoxin_pmu_init(void)
> +{
> + union cpuid10_edx edx;
> + union cpuid10_eax eax;
> + union cpuid10_ebx ebx;
> + struct event_constraint *c;
> + unsigned int unused;
> + int version;
> +
> + pr_info("Welcome to zhaoxin pmu!\n");
> +
> + /*
> + * Check whether the Architectural PerfMon supports
> + * hw_event or not.
> + */
> + cpuid(10, &eax.full, &ebx.full, &unused, &edx.full);
> +
> + if (eax.split.mask_length < ARCH_PERFMON_EVENTS_COUNT - 1)
> + return -ENODEV;
> +
> + version = eax.split.version_id;
> + if (version != 2)
> + return -ENODEV;
> +
> + x86_pmu = zhaoxin_pmu;
> + pr_info("Version check pass!\n");
> +
> + x86_pmu.version = version;
> + x86_pmu.num_counters = eax.split.num_counters;
> + x86_pmu.cntval_bits = eax.split.bit_width;
> + x86_pmu.cntval_mask = (1ULL << eax.split.bit_width) - 1;
> + x86_pmu.events_maskl = ebx.full;
> + x86_pmu.events_mask_len = eax.split.mask_length;
> +
> + x86_pmu.num_counters_fixed = edx.split.num_counters_fixed;
> + x86_add_quirk(zhaoxin_arch_events_quirk);
> +
> + switch (boot_cpu_data.x86) {
> + case 0x06:
> + if (boot_cpu_data.x86_model == 0x0f || boot_cpu_data.x86_model == 0x19) {
> +
> + x86_pmu.max_period = x86_pmu.cntval_mask >> 1;
> +
> + /* Clearing status works only if the global control is enable on zxc. */
> + x86_pmu.enabled_ack = 1;
> +
> + x86_pmu.event_constraints = zxc_event_constraints;
> + zx_pmon_event_map[PERF_COUNT_HW_INSTRUCTIONS] = 0;
> + zx_pmon_event_map[PERF_COUNT_HW_CACHE_REFERENCES] = 0;
> + zx_pmon_event_map[PERF_COUNT_HW_CACHE_MISSES] = 0;
> + zx_pmon_event_map[PERF_COUNT_HW_BUS_CYCLES] = 0;
> +
> + pr_cont("ZXC events, ");
> + break;
> + }
> + return -ENODEV;
> +
> + case 0x07:
> + zx_pmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_FRONTEND] =
> + X86_CONFIG(.event = 0x01, .umask = 0x01, .inv = 0x01, .cmask = 0x01);
> +
> + zx_pmon_event_map[PERF_COUNT_HW_STALLED_CYCLES_BACKEND] =
> + X86_CONFIG(.event = 0x0f, .umask = 0x04, .inv = 0, .cmask = 0);
> +
> + switch (boot_cpu_data.x86_model) {
> + case 0x1b:
> + memcpy(hw_cache_event_ids, zxd_hw_cache_event_ids,
> + sizeof(hw_cache_event_ids));
> +
> + x86_pmu.event_constraints = zxd_event_constraints;
> +
> + zx_pmon_event_map[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x0700;
> + zx_pmon_event_map[PERF_COUNT_HW_BRANCH_MISSES] = 0x0709;
> +
> + pr_cont("ZXD events, ");
> + break;
> + case 0x3b:
> + memcpy(hw_cache_event_ids, zxe_hw_cache_event_ids,
> + sizeof(hw_cache_event_ids));
> +
> + x86_pmu.event_constraints = zxd_event_constraints;
> +
> + zx_pmon_event_map[PERF_COUNT_HW_BRANCH_INSTRUCTIONS] = 0x0028;
> + zx_pmon_event_map[PERF_COUNT_HW_BRANCH_MISSES] = 0x0029;
> +
> + pr_cont("ZXE events, ");
> + break;
> + default:
> + return -ENODEV;
> + }
> + break;
> +
> + default:
> + return -ENODEV;
> + }
> +
> + x86_pmu.intel_ctrl = (1 << (x86_pmu.num_counters)) - 1;
> + x86_pmu.intel_ctrl |= ((1LL << x86_pmu.num_counters_fixed)-1) << INTEL_PMC_IDX_FIXED;
> +
> + if (x86_pmu.event_constraints) {
> + for_each_event_constraint(c, x86_pmu.event_constraints) {
> + c->idxmsk64 |= (1ULL << x86_pmu.num_counters) - 1;
> + c->weight += x86_pmu.num_counters;
> + }
> + }
> +
> + return 0;
> +}
> +
> --- a/arch/x86/kernel/cpu/perfctr-watchdog.c
> +++ b/arch/x86/kernel/cpu/perfctr-watchdog.c
> @@ -63,6 +63,10 @@ static inline unsigned int nmi_perfctr_m
> case 15:
> return msr - MSR_P4_BPU_PERFCTR0;
> }
> + fallthrough;
> + case X86_VENDOR_ZHAOXIN:
> + case X86_VENDOR_CENTAUR:
> + return msr - MSR_ARCH_PERFMON_PERFCTR0;
> }
> return 0;
> }
> @@ -92,6 +96,10 @@ static inline unsigned int nmi_evntsel_m
> case 15:
> return msr - MSR_P4_BSU_ESCR0;
> }
> + fallthrough;
> + case X86_VENDOR_ZHAOXIN:
> + case X86_VENDOR_CENTAUR:
> + return msr - MSR_ARCH_PERFMON_EVENTSEL0;
> }
> return 0;
>
> .
>
Dear Peter,
I'm so sorry that my coding errors have caused a misunderstanding. The
above 'fallthrough' should be 'break' in perfctr-watchdog.c, I changed
it when I resend the patch. But it looks like that there is no need to
resend the patch, becasue I got an email on May 2nd from tip-bot2, which
tells me this commit has been merged into the perf/core branch of tip.
Is there any way to change 'fallthrough' to 'break'? I guess I have no
permission to change the perf/core branch of tip, if you can, please help.
Thank you very much for your patience and kind help.
Cody.
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