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 <[email protected]>
---
arch/x86/events/Makefile | 2 +
arch/x86/events/core.c | 4 +
arch/x86/events/perf_event.h | 9 +
arch/x86/events/zhaoxin/Makefile | 2 +
arch/x86/events/zhaoxin/core.c | 618 +++++++++++++++++++++++++++++++++
arch/x86/kernel/cpu/perfctr-watchdog.c | 6 +
6 files changed, 641 insertions(+)
create mode 100644 arch/x86/events/zhaoxin/Makefile
create mode 100644 arch/x86/events/zhaoxin/core.c
diff --git a/arch/x86/events/Makefile b/arch/x86/events/Makefile
index 9e07f55..6f1d1fd 100644
--- 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/
diff --git a/arch/x86/events/core.c b/arch/x86/events/core.c
index 3bb738f..e76048e 100644
--- a/arch/x86/events/core.c
+++ b/arch/x86/events/core.c
@@ -1839,6 +1839,10 @@ static int __init init_hw_perf_events(void)
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;
}
diff --git a/arch/x86/events/perf_event.h b/arch/x86/events/perf_event.h
index f1cd1ca..f6bbdca 100644
--- a/arch/x86/events/perf_event.h
+++ b/arch/x86/events/perf_event.h
@@ -1133,3 +1133,12 @@ static inline int is_ht_workaround_enabled(void)
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*/
diff --git a/arch/x86/events/zhaoxin/Makefile b/arch/x86/events/zhaoxin/Makefile
new file mode 100644
index 0000000..642c1174
--- /dev/null
+++ b/arch/x86/events/zhaoxin/Makefile
@@ -0,0 +1,2 @@
+# SPDX-License-Identifier: GPL-2.0
+obj-y += core.o
diff --git a/arch/x86/events/zhaoxin/core.c b/arch/x86/events/zhaoxin/core.c
new file mode 100644
index 0000000..442251a
--- /dev/null
+++ b/arch/x86/events/zhaoxin/core.c
@@ -0,0 +1,618 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Per cpu state
+ *
+ * Used to coordinate shared registers among events on a single PMU.
+ */
+
+#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 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 bit;
+ u64 status;
+ bool is_zxc;
+ int handled = 0;
+
+ 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;
+
+ if (boot_cpu_data.x86 == 0x06 &&
+ (boot_cpu_data.x86_model == 0x0f ||
+ boot_cpu_data.x86_model == 0x19))
+ is_zxc = true;
+again:
+
+ /*Clearing status works only if the global control is enable on zxc.*/
+ if (is_zxc)
+ wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL, x86_pmu.intel_ctrl);
+
+ zhaoxin_pmu_ack_status(status);
+
+ if (is_zxc)
+ wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL, 0);
+
+ 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) {
+ x86_pmu = zhaoxin_pmu;
+ pr_info("Version check pass!\n");
+ } else
+ return -ENODEV;
+
+ 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;
+
+ 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, ");
+ } else
+ return -ENODEV;
+ break;
+ 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;
+}
+
diff --git a/arch/x86/kernel/cpu/perfctr-watchdog.c b/arch/x86/kernel/cpu/perfctr-watchdog.c
index 9556930..63a5828 100644
--- a/arch/x86/kernel/cpu/perfctr-watchdog.c
+++ b/arch/x86/kernel/cpu/perfctr-watchdog.c
@@ -63,6 +63,9 @@ static inline unsigned int nmi_perfctr_msr_to_bit(unsigned int msr)
case 15:
return msr - MSR_P4_BPU_PERFCTR0;
}
+ case X86_VENDOR_ZHAOXIN:
+ case X86_VENDOR_CENTAUR:
+ return msr - MSR_ARCH_PERFMON_PERFCTR0;
}
return 0;
}
@@ -92,6 +95,9 @@ static inline unsigned int nmi_evntsel_msr_to_bit(unsigned int msr)
case 15:
return msr - MSR_P4_BSU_ESCR0;
}
+ case X86_VENDOR_ZHAOXIN:
+ case X86_VENDOR_CENTAUR:
+ return msr - MSR_ARCH_PERFMON_EVENTSEL0;
}
return 0;
--
2.7.4
On Tue, Mar 31, 2020 at 05:39:59PM +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.
This looks like an Intel Architectural PMU v2 or so, is that correct? Do
you have a link to documentation for your CPU?
> +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 int zhaoxin_pmu_handle_irq(struct pt_regs *regs)
> +{
> + struct perf_sample_data data;
> + struct cpu_hw_events *cpuc;
> + int bit;
> + u64 status;
> + bool is_zxc;
> + int handled = 0;
> +
> + 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;
> +
> + if (boot_cpu_data.x86 == 0x06 &&
> + (boot_cpu_data.x86_model == 0x0f ||
> + boot_cpu_data.x86_model == 0x19))
> + is_zxc = true;
> +again:
> +
> + /*Clearing status works only if the global control is enable on zxc.*/
> + if (is_zxc)
> + wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL, x86_pmu.intel_ctrl);
> +
> + zhaoxin_pmu_ack_status(status);
> +
> + if (is_zxc)
> + wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL, 0);
That's an unfortunate errata; perhaps write it like so:
static inline void zxc_pmu_ack_status(u64 status)
{
/*
* ZXC needs global control enabled in order to clear status bits.
*/
zhaoxin_pmu_enable_all(0);
zhaoxin_pmu_ack_status(status);
zhaoxin_pmu_disable_all();
}
if (is_zxc)
zxc_pmu_ack_status(status);
else
zhaoxin_pmu_ack_status(status);
Alternatively; you can do a whole zxc specific handle_irq() and move the
get/ack status before disable_all(). If you do that, then factor this:
> + /*
> + * 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);
> + }
bit into it's own function so you don't have to duplicate it. Then the
two handle_irq() functions only differ in the status handling.
> +
> + /*
> + * 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;
> +}
On 2020/3/31 下午6:18, Peter Zijlstra wrote:
> On Tue, Mar 31, 2020 at 05:39:59PM +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.
>
> This looks like an Intel Architectural PMU v2 or so, is that correct? Do
> you have a link to documentation for your CPU?
>
I'm sorry for such a late reply. Yes, the usage method is the same as
Intel PMU v2, but there is no online document at present. For your
convenience, provide some event descriptions as follows:
-----------------------------------------------------------------------------------------------------------------------------------
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.
-----------------------------------------------------------------------------------------------------------------------------------
>> +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 int zhaoxin_pmu_handle_irq(struct pt_regs *regs)
>> +{
>> + struct perf_sample_data data;
>> + struct cpu_hw_events *cpuc;
>> + int bit;
>> + u64 status;
>> + bool is_zxc;
>> + int handled = 0;
>> +
>> + 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;
>> +
>> + if (boot_cpu_data.x86 == 0x06 &&
>> + (boot_cpu_data.x86_model == 0x0f ||
>> + boot_cpu_data.x86_model == 0x19))
>> + is_zxc = true;
>> +again:
>> +
>> + /*Clearing status works only if the global control is enable on zxc.*/
>> + if (is_zxc)
>> + wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL, x86_pmu.intel_ctrl);
>> +
>> + zhaoxin_pmu_ack_status(status);
>> +
>> + if (is_zxc)
>> + wrmsrl(MSR_CORE_PERF_GLOBAL_CTRL, 0);
>
> That's an unfortunate errata; perhaps write it like so:
>
Thank you very much for your advice, I have changed the code.
> static inline void zxc_pmu_ack_status(u64 status)
> {
> /*
> * ZXC needs global control enabled in order to clear status bits.
> */
> zhaoxin_pmu_enable_all(0);
> zhaoxin_pmu_ack_status(status);
> zhaoxin_pmu_disable_all();
> }
>
> if (is_zxc)
> zxc_pmu_ack_status(status);
> else
> zhaoxin_pmu_ack_status(status);
>
> Alternatively; you can do a whole zxc specific handle_irq() and move the
> get/ack status before disable_all(). If you do that, then factor this:
>
>> + /*
>> + * 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);
>> + }
>
> bit into it's own function so you don't have to duplicate it. Then the
> two handle_irq() functions only differ in the status handling.
>
>> +
>> + /*
>> + * 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;
>> +}
> .
>