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[59.124.168.89]) by smtp.gmail.com with ESMTPSA id u11-20020a17090a410b00b0025023726fc4sm617596pjf.26.2023.06.15.23.33.11 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 15 Jun 2023 23:33:15 -0700 (PDT) From: Eric Lin To: conor@kernel.org, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, palmer@dabbelt.com, paul.walmsley@sifive.com, aou@eecs.berkeley.edu, maz@kernel.org, chenhuacai@kernel.org, baolu.lu@linux.intel.com, will@kernel.org, kan.liang@linux.intel.com, nnac123@linux.ibm.com, pierre.gondois@arm.com, huangguangbin2@huawei.com, jgross@suse.com, chao.gao@intel.com, maobibo@loongson.cn, linux-riscv@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, dslin1010@gmail.com Cc: Greentime Hu , Eric Lin , Zong Li , Nick Hu Subject: [PATCH 2/3] soc: sifive: Add SiFive private L2 cache PMU driver Date: Fri, 16 Jun 2023 14:32:09 +0800 Message-Id: <20230616063210.19063-3-eric.lin@sifive.com> X-Mailer: git-send-email 2.40.1 In-Reply-To: <20230616063210.19063-1-eric.lin@sifive.com> References: <20230616063210.19063-1-eric.lin@sifive.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" From: Greentime Hu This adds SiFive private L2 cache PMU driver. User can use perf tool to profile by event name and event id. Example: $ perf stat -C 0 -e /sifive_pl2_pmu/inner_acquire_block_btot/ -e /sifive_pl2_pmu/inner_acquire_block_ntob/ -e /sifive_pl2_pmu/inner_acquire_block_ntot/ ls Performance counter stats for 'CPU(s) 0': 300 sifive_pl2_pmu/inner_acquire_block_btot/ 17801 sifive_pl2_pmu/inner_acquire_block_ntob/ 5253 sifive_pl2_pmu/inner_acquire_block_ntot/ 0.088917326 seconds time elapsed $ perf stat -C 0 -e /sifive_pl2_pmu/event=3D0x10001/ -e /sifive_pl2_pmu/event=3D0x4001/ -e /sifive_pl2_pmu/event=3D0x8001/ ls Performance counter stats for 'CPU(s) 0': 251 sifive_pl2_pmu/event=3D0x10001/ 2620 sifive_pl2_pmu/event=3D0x4001/ 644 sifive_pl2_pmu/event=3D0x8001/ 0.092827110 seconds time elapsed Signed-off-by: Greentime Hu Signed-off-by: Eric Lin Reviewed-by: Zong Li Reviewed-by: Nick Hu --- drivers/soc/sifive/Kconfig | 9 + drivers/soc/sifive/Makefile | 1 + drivers/soc/sifive/sifive_pl2.h | 20 + drivers/soc/sifive/sifive_pl2_cache.c | 16 + drivers/soc/sifive/sifive_pl2_pmu.c | 669 ++++++++++++++++++++++++++ include/linux/cpuhotplug.h | 1 + 6 files changed, 716 insertions(+) create mode 100644 drivers/soc/sifive/sifive_pl2_pmu.c diff --git a/drivers/soc/sifive/Kconfig b/drivers/soc/sifive/Kconfig index 573564295058..deeb752287c7 100644 --- a/drivers/soc/sifive/Kconfig +++ b/drivers/soc/sifive/Kconfig @@ -15,4 +15,13 @@ config SIFIVE_PL2 with both the upstream L1 caches and downstream L3 cache or memory, enabling a high-performance cache subsystem. =20 +config SIFIVE_PL2_PMU + bool "Sifive private L2 Cache PMU" + depends on SIFIVE_PL2 && PERF_EVENTS + default y + help + Support for the private L2 cache controller performance monitor unit + (PMU) on SiFive platforms. The SiFive private L2 PMU can monitor the + each hart L2 cache performance and it consists of a set of event + programmable counters and their event selector registers. endif diff --git a/drivers/soc/sifive/Makefile b/drivers/soc/sifive/Makefile index 707493e1c691..4bb3f97ef3f8 100644 --- a/drivers/soc/sifive/Makefile +++ b/drivers/soc/sifive/Makefile @@ -2,3 +2,4 @@ =20 obj-$(CONFIG_SIFIVE_CCACHE) +=3D sifive_ccache.o obj-$(CONFIG_SIFIVE_PL2) +=3D sifive_pl2_cache.o +obj-$(CONFIG_SIFIVE_PL2_PMU) +=3D sifive_pl2_pmu.o diff --git a/drivers/soc/sifive/sifive_pl2.h b/drivers/soc/sifive/sifive_pl= 2.h index 57aa1019d5ed..21207b0d6092 100644 --- a/drivers/soc/sifive/sifive_pl2.h +++ b/drivers/soc/sifive/sifive_pl2.h @@ -7,10 +7,16 @@ #ifndef _SIFIVE_PL2_H #define _SIFIVE_PL2_H =20 +#define SIFIVE_PL2_PMU_MAX_COUNTERS 64 +#define SIFIVE_PL2_SELECT_BASE_OFFSET 0x2000 +#define SIFIVE_PL2_COUNTER_BASE_OFFSET 0x3000 + #define SIFIVE_PL2_CONFIG1_OFFSET 0x1000 #define SIFIVE_PL2_CONFIG0_OFFSET 0x1008 #define SIFIVE_PL2_PMCLIENT_OFFSET 0x2800 =20 +#define SIFIVE_PL2_COUNTER_MASK GENMASK_ULL(63, 0) + struct sifive_pl2_state { void __iomem *pl2_base; u32 config1; @@ -18,6 +24,20 @@ struct sifive_pl2_state { u64 pmclientfilter; }; =20 +struct sifive_pl2_pmu_event { + struct perf_event **events; + void __iomem *event_counter_base; + void __iomem *event_select_base; + u32 counters; + DECLARE_BITMAP(used_mask, SIFIVE_PL2_PMU_MAX_COUNTERS); +}; + +struct sifive_pl2_pmu { + struct pmu *pmu; + struct hlist_node node; + cpumask_t cpumask; +}; + int sifive_pl2_pmu_init(void); int sifive_pl2_pmu_probe(struct device_node *pl2_node, void __iomem *pl2_base, int cpu); diff --git a/drivers/soc/sifive/sifive_pl2_cache.c b/drivers/soc/sifive/sif= ive_pl2_cache.c index aeb51d576af9..56d67879de54 100644 --- a/drivers/soc/sifive/sifive_pl2_cache.c +++ b/drivers/soc/sifive/sifive_pl2_cache.c @@ -161,6 +161,14 @@ static int sifive_pl2_cache_dev_probe(struct platform_= device *pdev) pl2_config_read(pl2_base, cpu); pl2_state->pl2_base =3D pl2_base; =20 + if (IS_ENABLED(CONFIG_SIFIVE_PL2_PMU)) { + ret =3D sifive_pl2_pmu_probe(pl2_node, pl2_base, cpu); + if (ret) { + pr_err("Fail to probe sifive_pl2_pmu driver.\n"); + goto early_err; + } + } + return 0; =20 early_err: @@ -196,6 +204,14 @@ static int __init sifive_pl2_cache_init(void) =20 sifive_pl2_pm_init(); =20 + if (IS_ENABLED(CONFIG_SIFIVE_PL2_PMU)) { + ret =3D sifive_pl2_pmu_init(); + if (ret) { + pr_err("Fail to init sifive_pl2_pmu driver.\n"); + return ret; + } + } + return ret; } =20 diff --git a/drivers/soc/sifive/sifive_pl2_pmu.c b/drivers/soc/sifive/sifiv= e_pl2_pmu.c new file mode 100644 index 000000000000..848f0445437a --- /dev/null +++ b/drivers/soc/sifive/sifive_pl2_pmu.c @@ -0,0 +1,669 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * SiFive private L2 cache controller PMU Driver + * + * Copyright (C) 2018-2023 SiFive, Inc. + */ + +#define pr_fmt(fmt) "pL2CACHE_PMU: " fmt + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include "sifive_pl2.h" + +static bool pl2pmu_init_done; +static struct sifive_pl2_pmu sifive_pl2_pmu; +static DEFINE_PER_CPU(struct sifive_pl2_pmu_event, sifive_pl2_pmu_event); + +#ifndef readq +static inline unsigned long long readq(void __iomem *addr) +{ + return readl(addr) | (((unsigned long long)readl(addr + 4)) << 32LL); +} +#endif + +#ifndef writeq +static inline void writeq(unsigned long long v, void __iomem *addr) +{ + writel(lower_32_bits(v), addr); + writel(upper_32_bits(v), addr + 4); +} +#endif + +/* + * Add sysfs attributes + * + * We export: + * - formats, used by perf user space and other tools to configure events + * - events, used by perf user space and other tools to create events + * symbolically, e.g.: + * perf stat -a -e sifive_pl2_pmu/inner_put_partial_data_hit/ ls + * perf stat -a -e sifive_pl2_pmu/event=3D0x101/ ls + * - cpumask, used by perf user space and other tools to know on which CPUs + */ + +/* cpumask */ +static ssize_t cpumask_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + return cpumap_print_to_pagebuf(true, buf, &sifive_pl2_pmu.cpumask); +}; + +static DEVICE_ATTR_RO(cpumask); + +static struct attribute *sifive_pl2_pmu_cpumask_attrs[] =3D { + &dev_attr_cpumask.attr, + NULL, +}; + +static const struct attribute_group sifive_pl2_pmu_cpumask_attr_group =3D { + .attrs =3D sifive_pl2_pmu_cpumask_attrs, +}; + +/* formats */ +static ssize_t sifive_pl2_pmu_format_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct dev_ext_attribute *eattr; + + eattr =3D container_of(attr, struct dev_ext_attribute, attr); + return sysfs_emit(buf, "%s\n", (char *)eattr->var); +} + +#define SIFIVE_PL2_PMU_PMU_FORMAT_ATTR(_name, _config) \ + (&((struct dev_ext_attribute[]) { \ + { .attr =3D __ATTR(_name, 0444, sifive_pl2_pmu_format_show, NULL),\ + .var =3D (void *)_config, } \ + })[0].attr.attr) + +static struct attribute *sifive_pl2_pmu_formats[] =3D { + SIFIVE_PL2_PMU_PMU_FORMAT_ATTR(event, "config:0-63"), + NULL, +}; + +static struct attribute_group sifive_pl2_pmu_format_group =3D { + .name =3D "format", + .attrs =3D sifive_pl2_pmu_formats, +}; + +/* events */ + +static ssize_t sifive_pl2_pmu_event_show(struct device *dev, + struct device_attribute *attr, + char *page) +{ + struct perf_pmu_events_attr *pmu_attr; + + pmu_attr =3D container_of(attr, struct perf_pmu_events_attr, attr); + return sysfs_emit(page, "event=3D0x%02llx\n", pmu_attr->id); +} + +#define SET_EVENT_SELECT(_event, _set) (((u64)1 << ((_event) + 8)) | (_set= )) +#define PL2_PMU_EVENT_ATTR(_name, _event, _set) \ + PMU_EVENT_ATTR_ID(_name, sifive_pl2_pmu_event_show, \ + SET_EVENT_SELECT(_event, _set)) + +enum pl2_pmu_event_set1 { + INNER_PUT_FULL_DATA =3D 0, + INNER_PUT_PARTIAL_DATA, + INNER_ARITHMETIC_DATA, + INNER_GET, + INNER_PREFETCH_READ, + INNER_PREFETCH_WRITE, + INNER_ACQUIRE_BLOCK_NTOB, + INNER_ACQUIRE_BLOCK_NTOT, + INNER_ACQUIRE_BLOCK_BTOT, + INNER_ACQUIRE_PERM_NTOT, + INNER_ACQUIRE_PERM_BTOT, + INNER_RELEASE_TTOB, + INNER_RELEASE_TTON, + INNER_RELEASE_BTON, + INNER_RELEASE_DATA_TTOB, + INNER_RELEASE_DATA_TTON, + INNER_RELEASE_DATA_BTON, + INNER_RELEASE_DATA_TTOT, + INNER_PROBE_BLOCK_TOT, + INNER_PROBE_BLOCK_TOB, + INNER_PROBE_BLOCK_TON, + INNER_PROBE_PERM_TON, + INNER_PROBE_ACK_TTOB, + INNER_PROBE_ACK_TTON, + INNER_PROBE_ACK_BTON, + INNER_PROBE_ACK_TTOT, + INNER_PROBE_ACK_BTOB, + INNER_PROBE_ACK_NTON, + INNER_PROBE_ACK_DATA_TTOB, + INNER_PROBE_ACK_DATA_TTON, + INNER_PROBE_ACK_DATA_TTOT, + PL2_PMU_MAX_EVENT1_IDX +}; + +enum pl2_pmu_event_set2 { + INNER_PUT_FULL_DATA_HIT =3D 0, + INNER_PUT_PARTIAL_DATA_HIT, + INNER_ARITHMETIC_DATA_HIT, + INNER_GET_HIT, + INNER_PREFETCH_READ_HIT, + INNER_ACQUIRE_BLOCK_NTOB_HIT, + INNER_ACQUIRE_PERM_NTOT_HIT, + INNER_RELEASE_TTOB_HIT, + INNER_RELEASE_DATA_TTOB_HIT, + OUTER_PROBE_BLOCK_TOT_HIT, + INNER_PUT_FULL_DATA_HIT_SHARED, + INNER_PUT_PARTIAL_DATA_HIT_SHARED, + INNER_ARITHMETIC_DATA_HIT_SHARED, + INNER_GET_HIT_SHARED, + INNER_PREFETCH_READ_HIT_SHARED, + INNER_ACQUIRE_BLOCK_HIT_SHARED, + INNER_ACQUIRE_PERM_NTOT_HIT_SHARED, + OUTER_PROBE_BLOCK_TOT_HIT_SHARED, + OUTER_PROBE_BLOCK_TOT_HIT_DIRTY, + PL2_PMU_MAX_EVENT2_IDX +}; + +enum pl2_pmu_event_set3 { + OUTER_PUT_FULL_DATA =3D 0, + OUTER_PUT_PARTIAL_DATA, + OUTER_ARITHMETIC_DATA, + OUTER_GET, + OUTER_PREFETCH_READ, + OUTER_PREFETCH_WRITE, + OUTER_ACQUIRE_BLOCK_NTOB, + OUTER_ACQUIRE_BLOCK_NTOT, + OUTER_ACQUIRE_BLOCK_BTOT, + OUTER_ACQUIRE_PERM_NTOT, + OUTER_ACQUIRE_PERM_BTOT, + OUTER_RELEARE_TTOB, + OUTER_RELEARE_TTON, + OUTER_RELEARE_BTON, + OUTER_RELEARE_DATA_TTOB, + OUTER_RELEARE_DATA_TTON, + OUTER_RELEARE_DATA_BTON, + OUTER_RELEARE_DATA_TTOT, + OUTER_PROBE_BLOCK_TOT, + OUTER_PROBE_BLOCK_TOB, + OUTER_PROBE_BLOCK_TON, + OUTER_PROBE_PERM_TON, + OUTER_PROBE_ACK_TTOB, + OUTER_PROBE_ACK_TTON, + OUTER_PROBE_ACK_BTON, + OUTER_PROBE_ACK_TTOT, + OUTER_PROBE_ACK_BTOB, + OUTER_PROBE_ACK_NTON, + OUTER_PROBE_ACK_DATA_TTOB, + OUTER_PROBE_ACK_DATA_TTON, + OUTER_PROBE_ACK_DATA_TTOT, + PL2_PMU_MAX_EVENT3_IDX +}; + +enum pl2_pmu_event_set4 { + INNER_HINT_HITS_MSHR =3D 0, + INNER_READ_HITS_MSHR, + INNER_WRITE_HITS_MSHR, + INNER_READ_REPLAY, + INNER_WRITE_REPLAY, + OUTER_PROBE_REPLAY, + PL2_PMU_MAX_EVENT4_IDX +}; + +static struct attribute *sifive_pl2_pmu_events[] =3D { + PL2_PMU_EVENT_ATTR(inner_put_full_data, INNER_PUT_FULL_DATA, 1), + PL2_PMU_EVENT_ATTR(inner_put_partial_data, INNER_PUT_PARTIAL_DATA, 1), + PL2_PMU_EVENT_ATTR(inner_arithmetic_data, INNER_ARITHMETIC_DATA, 1), + PL2_PMU_EVENT_ATTR(inner_get, INNER_GET, 1), + PL2_PMU_EVENT_ATTR(inner_prefetch_read, INNER_PREFETCH_READ, 1), + PL2_PMU_EVENT_ATTR(inner_prefetch_write, INNER_PREFETCH_WRITE, 1), + PL2_PMU_EVENT_ATTR(inner_acquire_block_ntob, INNER_ACQUIRE_BLOCK_NTOB, 1), + PL2_PMU_EVENT_ATTR(inner_acquire_block_ntot, INNER_ACQUIRE_BLOCK_NTOT, 1), + PL2_PMU_EVENT_ATTR(inner_acquire_block_btot, INNER_ACQUIRE_BLOCK_BTOT, 1), + PL2_PMU_EVENT_ATTR(inner_acquire_perm_ntot, INNER_ACQUIRE_PERM_NTOT, 1), + PL2_PMU_EVENT_ATTR(inner_acquire_perm_btot, INNER_ACQUIRE_PERM_BTOT, 1), + PL2_PMU_EVENT_ATTR(inner_release_ttob, INNER_RELEASE_TTOB, 1), + PL2_PMU_EVENT_ATTR(inner_release_tton, INNER_RELEASE_TTON, 1), + PL2_PMU_EVENT_ATTR(inner_release_bton, INNER_RELEASE_BTON, 1), + PL2_PMU_EVENT_ATTR(inner_release_data_ttob, INNER_RELEASE_DATA_TTOB, 1), + PL2_PMU_EVENT_ATTR(inner_release_data_tton, INNER_RELEASE_DATA_TTON, 1), + PL2_PMU_EVENT_ATTR(inner_release_data_bton, INNER_RELEASE_DATA_BTON, 1), + PL2_PMU_EVENT_ATTR(inner_release_data_ttot, INNER_RELEASE_DATA_TTOT, 1), + PL2_PMU_EVENT_ATTR(inner_probe_block_tot, INNER_PROBE_BLOCK_TOT, 1), + PL2_PMU_EVENT_ATTR(inner_probe_block_tob, INNER_PROBE_BLOCK_TOB, 1), + PL2_PMU_EVENT_ATTR(inner_probe_block_ton, INNER_PROBE_BLOCK_TON, 1), + PL2_PMU_EVENT_ATTR(inner_probe_perm_ton, INNER_PROBE_PERM_TON, 1), + PL2_PMU_EVENT_ATTR(inner_probe_ack_ttob, INNER_PROBE_ACK_TTOB, 1), + PL2_PMU_EVENT_ATTR(inner_probe_ack_tton, INNER_PROBE_ACK_TTON, 1), + PL2_PMU_EVENT_ATTR(inner_probe_ack_bton, INNER_PROBE_ACK_BTON, 1), + PL2_PMU_EVENT_ATTR(inner_probe_ack_ttot, INNER_PROBE_ACK_TTOT, 1), + PL2_PMU_EVENT_ATTR(inner_probe_ack_btob, INNER_PROBE_ACK_BTOB, 1), + PL2_PMU_EVENT_ATTR(inner_probe_ack_nton, INNER_PROBE_ACK_NTON, 1), + PL2_PMU_EVENT_ATTR(inner_probe_ack_data_ttob, INNER_PROBE_ACK_DATA_TTOB, = 1), + PL2_PMU_EVENT_ATTR(inner_probe_ack_data_tton, INNER_PROBE_ACK_DATA_TTON, = 1), + PL2_PMU_EVENT_ATTR(inner_probe_ack_data_ttot, INNER_PROBE_ACK_DATA_TTOT, = 1), + + PL2_PMU_EVENT_ATTR(inner_put_full_data_hit, INNER_PUT_FULL_DATA_HIT, 2), + PL2_PMU_EVENT_ATTR(inner_put_partial_data_hit, INNER_PUT_PARTIAL_DATA_HIT= , 2), + PL2_PMU_EVENT_ATTR(inner_arithmetic_data_hit, INNER_ARITHMETIC_DATA_HIT, = 2), + PL2_PMU_EVENT_ATTR(inner_get_hit, INNER_GET_HIT, 2), + PL2_PMU_EVENT_ATTR(inner_prefetch_read_hit, INNER_PREFETCH_READ_HIT, 2), + PL2_PMU_EVENT_ATTR(inner_acquire_block_ntob_hit, INNER_ACQUIRE_BLOCK_NTOB= _HIT, 2), + PL2_PMU_EVENT_ATTR(inner_acquire_perm_ntot_hit, INNER_ACQUIRE_PERM_NTOT_H= IT, 2), + PL2_PMU_EVENT_ATTR(inner_release_ttob_hit, INNER_RELEASE_TTOB_HIT, 2), + PL2_PMU_EVENT_ATTR(inner_release_data_ttob_hit, INNER_RELEASE_DATA_TTOB_H= IT, 2), + PL2_PMU_EVENT_ATTR(outer_probe_block_tot_hit, OUTER_PROBE_BLOCK_TOT_HIT, = 2), + PL2_PMU_EVENT_ATTR(inner_put_full_data_hit_shared, INNER_PUT_FULL_DATA_HI= T_SHARED, 2), + PL2_PMU_EVENT_ATTR(inner_put_partial_data_hit_shared, INNER_PUT_PARTIAL_D= ATA_HIT_SHARED, 2), + PL2_PMU_EVENT_ATTR(inner_arithmetic_data_hit_shared, INNER_ARITHMETIC_DAT= A_HIT_SHARED, 2), + PL2_PMU_EVENT_ATTR(inner_get_hit_shared, INNER_GET_HIT_SHARED, 2), + PL2_PMU_EVENT_ATTR(inner_prefetch_read_hit_shared, INNER_PREFETCH_READ_HI= T_SHARED, 2), + PL2_PMU_EVENT_ATTR(inner_acquire_block_hit_shared, INNER_ACQUIRE_BLOCK_HI= T_SHARED, 2), + PL2_PMU_EVENT_ATTR(inner_acquire_perm_hit_shared, INNER_ACQUIRE_PERM_NTOT= _HIT_SHARED, 2), + PL2_PMU_EVENT_ATTR(outer_probe_block_tot_hit_shared, OUTER_PROBE_BLOCK_TO= T_HIT_SHARED, 2), + PL2_PMU_EVENT_ATTR(outer_probe_block_tot_hit_dirty, OUTER_PROBE_BLOCK_TOT= _HIT_DIRTY, 2), + + PL2_PMU_EVENT_ATTR(outer_put_full_data, OUTER_PUT_FULL_DATA, 3), + PL2_PMU_EVENT_ATTR(outer_put_partial_data, OUTER_PUT_PARTIAL_DATA, 3), + PL2_PMU_EVENT_ATTR(outer_arithmetic_data, OUTER_ARITHMETIC_DATA, 3), + PL2_PMU_EVENT_ATTR(outer_get, OUTER_GET, 3), + PL2_PMU_EVENT_ATTR(outer_prefetch_read, OUTER_PREFETCH_READ, 3), + PL2_PMU_EVENT_ATTR(outer_prefetch_write, OUTER_PREFETCH_WRITE, 3), + PL2_PMU_EVENT_ATTR(outer_acquire_block_ntob, OUTER_ACQUIRE_BLOCK_NTOB, 3), + PL2_PMU_EVENT_ATTR(outer_acquire_block_ntot, OUTER_ACQUIRE_BLOCK_NTOT, 3), + PL2_PMU_EVENT_ATTR(outer_acquire_block_btot, OUTER_ACQUIRE_BLOCK_BTOT, 3), + PL2_PMU_EVENT_ATTR(outer_acquire_perm_ntot, OUTER_ACQUIRE_PERM_NTOT, 3), + PL2_PMU_EVENT_ATTR(outer_acquire_perm_btot, OUTER_ACQUIRE_PERM_BTOT, 3), + PL2_PMU_EVENT_ATTR(outer_release_ttob, OUTER_RELEARE_TTOB, 3), + PL2_PMU_EVENT_ATTR(outer_release_tton, OUTER_RELEARE_TTON, 3), + PL2_PMU_EVENT_ATTR(outer_release_bton, OUTER_RELEARE_BTON, 3), + PL2_PMU_EVENT_ATTR(outer_release_data_ttob, OUTER_RELEARE_DATA_TTOB, 3), + PL2_PMU_EVENT_ATTR(outer_release_data_tton, OUTER_RELEARE_DATA_TTON, 3), + PL2_PMU_EVENT_ATTR(outer_release_data_bton, OUTER_RELEARE_DATA_BTON, 3), + PL2_PMU_EVENT_ATTR(outer_release_data_ttot, OUTER_RELEARE_DATA_TTOT, 3), + PL2_PMU_EVENT_ATTR(outer_probe_block_tot, OUTER_PROBE_BLOCK_TOT, 3), + PL2_PMU_EVENT_ATTR(outer_probe_block_tob, OUTER_PROBE_BLOCK_TOB, 3), + PL2_PMU_EVENT_ATTR(outer_probe_block_ton, OUTER_PROBE_BLOCK_TON, 3), + PL2_PMU_EVENT_ATTR(outer_probe_perm_ton, OUTER_PROBE_PERM_TON, 3), + PL2_PMU_EVENT_ATTR(outer_probe_ack_ttob, OUTER_PROBE_ACK_TTOB, 3), + PL2_PMU_EVENT_ATTR(outer_probe_ack_tton, OUTER_PROBE_ACK_TTON, 3), + PL2_PMU_EVENT_ATTR(outer_probe_ack_bton, OUTER_PROBE_ACK_BTON, 3), + PL2_PMU_EVENT_ATTR(outer_probe_ack_ttot, OUTER_PROBE_ACK_TTOT, 3), + PL2_PMU_EVENT_ATTR(outer_probe_ack_btob, OUTER_PROBE_ACK_BTOB, 3), + PL2_PMU_EVENT_ATTR(outer_probe_ack_nton, OUTER_PROBE_ACK_NTON, 3), + PL2_PMU_EVENT_ATTR(outer_probe_ack_data_ttob, OUTER_PROBE_ACK_DATA_TTOB, = 3), + PL2_PMU_EVENT_ATTR(outer_probe_ack_data_tton, OUTER_PROBE_ACK_DATA_TTON, = 3), + PL2_PMU_EVENT_ATTR(outer_probe_ack_data_ttot, OUTER_PROBE_ACK_DATA_TTOT, = 3), + + PL2_PMU_EVENT_ATTR(inner_hint_hits_mshr, INNER_HINT_HITS_MSHR, 4), + PL2_PMU_EVENT_ATTR(inner_read_hits_mshr, INNER_READ_HITS_MSHR, 4), + PL2_PMU_EVENT_ATTR(inner_write_hits_mshr, INNER_WRITE_HITS_MSHR, 4), + PL2_PMU_EVENT_ATTR(inner_read_replay, INNER_READ_REPLAY, 4), + PL2_PMU_EVENT_ATTR(inner_write_replay, INNER_WRITE_REPLAY, 4), + PL2_PMU_EVENT_ATTR(outer_probe_replay, OUTER_PROBE_REPLAY, 4), + NULL +}; + +static struct attribute_group sifive_pl2_pmu_events_group =3D { + .name =3D "events", + .attrs =3D sifive_pl2_pmu_events, +}; + +/* + * Per PMU device attribute groups + */ + +static const struct attribute_group *sifive_pl2_pmu_attr_grps[] =3D { + &sifive_pl2_pmu_format_group, + &sifive_pl2_pmu_events_group, + &sifive_pl2_pmu_cpumask_attr_group, + NULL, +}; + +/* + * Low-level functions: reading and writing counters + */ + +static inline u64 read_counter(int idx) +{ + struct sifive_pl2_pmu_event *ptr =3D this_cpu_ptr(&sifive_pl2_pmu_event); + + if (WARN_ON_ONCE(idx < 0 || idx > ptr->counters)) + return -EINVAL; + + return readq(ptr->event_counter_base + idx * 8); +} + +static inline void write_counter(int idx, u64 val) +{ + struct sifive_pl2_pmu_event *ptr =3D this_cpu_ptr(&sifive_pl2_pmu_event); + + writeq(val, ptr->event_counter_base + idx * 8); +} + +/* + * pmu->read: read and update the counter + */ +static void sifive_pl2_pmu_read(struct perf_event *event) +{ + struct hw_perf_event *hwc =3D &event->hw; + u64 prev_raw_count, new_raw_count; + u64 oldval; + int idx =3D hwc->idx; + u64 delta; + + do { + prev_raw_count =3D local64_read(&hwc->prev_count); + new_raw_count =3D read_counter(idx); + + oldval =3D local64_cmpxchg(&hwc->prev_count, prev_raw_count, + new_raw_count); + } while (oldval !=3D prev_raw_count); + + /* delta is the value to update the counter we maintain in the kernel. */ + delta =3D (new_raw_count - prev_raw_count) & SIFIVE_PL2_COUNTER_MASK; + local64_add(delta, &event->count); +} + +/* + * State transition functions: + * + * stop()/start() & add()/del() + */ + +/* + * pmu->stop: stop the counter + */ +static void sifive_pl2_pmu_stop(struct perf_event *event, int flags) +{ + struct hw_perf_event *hwc =3D &event->hw; + struct sifive_pl2_pmu_event *ptr =3D this_cpu_ptr(&sifive_pl2_pmu_event); + + /* Disable this counter to count events */ + writeq(0, ptr->event_select_base + (hwc->idx * 8)); + + WARN_ON_ONCE(hwc->state & PERF_HES_STOPPED); + hwc->state |=3D PERF_HES_STOPPED; + + if ((flags & PERF_EF_UPDATE) && !(hwc->state & PERF_HES_UPTODATE)) { + sifive_pl2_pmu_read(event); + hwc->state |=3D PERF_HES_UPTODATE; + } +} + +/* + * pmu->start: start the event. + */ +static void sifive_pl2_pmu_start(struct perf_event *event, int flags) +{ + struct hw_perf_event *hwc =3D &event->hw; + struct sifive_pl2_pmu_event *ptr =3D this_cpu_ptr(&sifive_pl2_pmu_event); + + if (WARN_ON_ONCE(!(event->hw.state & PERF_HES_STOPPED))) + return; + + if (flags & PERF_EF_RELOAD) + WARN_ON_ONCE(!(event->hw.state & PERF_HES_UPTODATE)); + + hwc->state =3D 0; + perf_event_update_userpage(event); + + /* Set initial value 0 */ + local64_set(&hwc->prev_count, 0); + write_counter(hwc->idx, 0); + + /* Enable counter to count these events */ + writeq(hwc->config, ptr->event_select_base + (hwc->idx * 8)); +} + +/* + * pmu->add: add the event to PMU. + */ +static int sifive_pl2_pmu_add(struct perf_event *event, int flags) +{ + struct hw_perf_event *hwc =3D &event->hw; + struct sifive_pl2_pmu_event *ptr =3D this_cpu_ptr(&sifive_pl2_pmu_event); + int idx; + u64 config =3D event->attr.config; + u64 set =3D config & 0xff; + u64 ev_type =3D config >> 8; + + /* Check if this is a valid set and event. */ + switch (set) { + case 1: + if (ev_type >=3D (BIT_ULL(PL2_PMU_MAX_EVENT1_IDX))) + return -ENOENT; + break; + case 2: + if (ev_type >=3D (BIT_ULL(PL2_PMU_MAX_EVENT2_IDX))) + return -ENOENT; + break; + case 3: + if (ev_type >=3D (BIT_ULL(PL2_PMU_MAX_EVENT3_IDX))) + return -ENOENT; + break; + case 4: + if (ev_type >=3D (BIT_ULL(PL2_PMU_MAX_EVENT4_IDX))) + return -ENOENT; + break; + case 0: + default: + return -ENOENT; + } + + idx =3D find_first_zero_bit(ptr->used_mask, ptr->counters); + /* The counters are all in use. */ + if (idx =3D=3D ptr->counters) + return -EAGAIN; + + set_bit(idx, ptr->used_mask); + + /* Found an available counter idx for this event. */ + hwc->idx =3D idx; + ptr->events[hwc->idx] =3D event; + + hwc->state =3D PERF_HES_UPTODATE | PERF_HES_STOPPED; + + if (flags & PERF_EF_START) + sifive_pl2_pmu_start(event, PERF_EF_RELOAD); + + perf_event_update_userpage(event); + return 0; +} + +/* + * pmu->del: delete the event from PMU. + */ +static void sifive_pl2_pmu_del(struct perf_event *event, int flags) +{ + struct sifive_pl2_pmu_event *ptr =3D this_cpu_ptr(&sifive_pl2_pmu_event); + struct hw_perf_event *hwc =3D &event->hw; + + /* Stop the counter and release this counter. */ + ptr->events[hwc->idx] =3D NULL; + sifive_pl2_pmu_stop(event, PERF_EF_UPDATE); + clear_bit(hwc->idx, ptr->used_mask); + perf_event_update_userpage(event); +} + +/* + * Event Initialization/Finalization + */ + +static int sifive_pl2_pmu_event_init(struct perf_event *event) +{ + struct hw_perf_event *hwc =3D &event->hw; + + /* Don't allocate hw counter yet. */ + hwc->idx =3D -1; + hwc->config =3D event->attr.config; + + return 0; +} + +/* + * Initialization + */ + +static struct pmu sifive_pl2_generic_pmu =3D { + .name =3D "sifive_pl2_pmu", + .task_ctx_nr =3D perf_invalid_context, + .event_init =3D sifive_pl2_pmu_event_init, + .add =3D sifive_pl2_pmu_add, + .del =3D sifive_pl2_pmu_del, + .start =3D sifive_pl2_pmu_start, + .stop =3D sifive_pl2_pmu_stop, + .read =3D sifive_pl2_pmu_read, + .attr_groups =3D sifive_pl2_pmu_attr_grps, + .capabilities =3D PERF_PMU_CAP_NO_EXCLUDE | PERF_PMU_CAP_NO_INTERRUPT, +}; + +static struct sifive_pl2_pmu sifive_pl2_pmu =3D { + .pmu =3D &sifive_pl2_generic_pmu, +}; + +/* + * CPU Hotplug call back function + */ +static int sifive_pl2_pmu_online_cpu(unsigned int cpu, struct hlist_node *= node) +{ + struct sifive_pl2_pmu *ptr =3D hlist_entry_safe(node, struct sifive_pl2_p= mu, node); + + if (!cpumask_test_cpu(cpu, &ptr->cpumask)) + cpumask_set_cpu(cpu, &ptr->cpumask); + + return 0; +} + +static int sifive_pl2_pmu_offline_cpu(unsigned int cpu, struct hlist_node = *node) +{ + struct sifive_pl2_pmu *ptr =3D hlist_entry_safe(node, struct sifive_pl2_p= mu, node); + + /* Clear this cpu in cpumask */ + cpumask_test_and_clear_cpu(cpu, &ptr->cpumask); + + return 0; +} + +/* + * PM notifer for suspend to ram + */ +#ifdef CONFIG_CPU_PM +static int sifive_pl2_pmu_pm_notify(struct notifier_block *b, unsigned lon= g cmd, + void *v) +{ + struct sifive_pl2_pmu_event *ptr =3D this_cpu_ptr(&sifive_pl2_pmu_event); + struct perf_event *event; + int idx; + int enabled_event =3D bitmap_weight(ptr->used_mask, ptr->counters); + + if (!enabled_event) + return NOTIFY_OK; + + for (idx =3D 0; idx < ptr->counters; idx++) { + event =3D ptr->events[idx]; + if (!event) + continue; + + switch (cmd) { + case CPU_PM_ENTER: + /* Stop and update the counter */ + sifive_pl2_pmu_stop(event, PERF_EF_UPDATE); + break; + case CPU_PM_ENTER_FAILED: + case CPU_PM_EXIT: + /* + * Restore and enable the counter. + * + * Requires RCU read locking to be functional, + * wrap the call within RCU_NONIDLE to make the + * RCU subsystem aware this cpu is not idle from + * an RCU perspective for the sifive_pl2_pmu_start() call + * duration. + */ + RCU_NONIDLE(sifive_pl2_pmu_start(event, PERF_EF_RELOAD)); + break; + default: + break; + } + } + + return NOTIFY_OK; +} + +static struct notifier_block sifive_pl2_pmu_pm_notifier_block =3D { + .notifier_call =3D sifive_pl2_pmu_pm_notify, +}; + +static inline void sifive_pl2_pmu_pm_init(void) +{ + cpu_pm_register_notifier(&sifive_pl2_pmu_pm_notifier_block); +} + +#else +static inline void sifive_pl2_pmu_pm_init(void) { } +#endif /* CONFIG_CPU_PM */ + +int sifive_pl2_pmu_probe(struct device_node *pl2_node, + void __iomem *pl2_base, int cpu) +{ + struct sifive_pl2_pmu_event *ptr =3D per_cpu_ptr(&sifive_pl2_pmu_event, c= pu); + int ret =3D -EINVAL; + + /* Get counter numbers. */ + ret =3D of_property_read_u32(pl2_node, "sifive,perfmon-counters", &ptr->c= ounters); + if (ret) { + pr_err("Not found sifive,perfmon-counters property\n"); + goto early_err; + } + pr_info("perfmon-counters: %d for CPU %d\n", ptr->counters, cpu); + + /* Allocate perf_event. */ + ptr->events =3D kcalloc(ptr->counters, sizeof(struct perf_event), GFP_KER= NEL); + if (!ptr->events) + return -ENOMEM; + + ptr->event_select_base =3D pl2_base + SIFIVE_PL2_SELECT_BASE_OFFSET; + ptr->event_counter_base =3D pl2_base + SIFIVE_PL2_COUNTER_BASE_OFFSET; + + if (!pl2pmu_init_done) { + ret =3D perf_pmu_register(sifive_pl2_pmu.pmu, sifive_pl2_pmu.pmu->name, = -1); + if (ret) { + cpuhp_state_remove_instance(CPUHP_AP_PERF_RISCV_SIFIVE_PL2_PMU_ONLINE, + &sifive_pl2_pmu.node); + pr_err("Failed to register sifive_pl2_pmu.pmu: %d\n", ret); + } + sifive_pl2_pmu_pm_init(); + pl2pmu_init_done =3D true; + } + + return 0; + +early_err: + return ret; +} + +int sifive_pl2_pmu_init(void) +{ + int ret =3D 0; + + ret =3D cpuhp_setup_state_multi(CPUHP_AP_PERF_RISCV_SIFIVE_PL2_PMU_ONLINE, + "perf/sifive/pl2pmu:online", + sifive_pl2_pmu_online_cpu, + sifive_pl2_pmu_offline_cpu); + if (ret) + pr_err("Failed to register CPU hotplug notifier %d\n", ret); + + ret =3D cpuhp_state_add_instance(CPUHP_AP_PERF_RISCV_SIFIVE_PL2_PMU_ONLIN= E, + &sifive_pl2_pmu.node); + if (ret) + pr_err("Failed to add hotplug instance: %d\n", ret); + + return ret; +} diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h index 35cd5ba0030b..9c1a91c8cdaa 100644 --- a/include/linux/cpuhotplug.h +++ b/include/linux/cpuhotplug.h @@ -243,6 +243,7 @@ enum cpuhp_state { CPUHP_AP_PERF_POWERPC_HV_24x7_ONLINE, CPUHP_AP_PERF_POWERPC_HV_GPCI_ONLINE, CPUHP_AP_PERF_CSKY_ONLINE, + CPUHP_AP_PERF_RISCV_SIFIVE_PL2_PMU_ONLINE, CPUHP_AP_WATCHDOG_ONLINE, CPUHP_AP_WORKQUEUE_ONLINE, CPUHP_AP_RANDOM_ONLINE, --=20 2.40.1