[RFC PATCH 2/2] {topost} drivers/perf: hisi: add driver for HNS3 PMU
John Garry
john.garry at huawei.com
Thu Mar 25 15:53:42 GMT 2021
On 22/03/2021 01:49, Guangbin Huang wrote:
> HNS3 PMU End Point device supports to collect performance statistics
> of bandwidth, latency, packet rate, interrupt rate in HiSilicon SoC
> NIC.
>
I tried to apply this patch as an experiment, but it does not apply
cleanly on v5.12-rc4 or v5.11. What is the baseline?
> NIC of each IO DIE has one PMU device for it. Driver registers each
> PMU device to perf, and exports information of supported events,
> filter mode of each event, identifier and so on via sysfs.
>
> Each PMU device has its own control, counter and interrupt registers,
> and supports up to 8 events by hardware.
>
> Filter options contains:
> event - select event
> subevent - select subevent
> port - select physical port of nic
> tc - select tc(must be used with port)
> func - select PF/VF
> queue - select queue of PF/VF(must be used with func)
> intr - select interrupt number(must be used with func)
> global - select all functions of IO DIE
>
> Signed-off-by: Guangbin Huang <huangguangbin2 at huawei.com>
> ---
> MAINTAINERS | 5 +
> drivers/perf/pci/Kconfig | 10 +
> drivers/perf/pci/hisilicon/Makefile | 1 +
> drivers/perf/pci/hisilicon/hns3_pmu.c | 1937 +++++++++++++++++++++++++++++++++
> include/linux/cpuhotplug.h | 1 +
> 5 files changed, 1954 insertions(+)
> create mode 100644 drivers/perf/pci/hisilicon/hns3_pmu.c
>
> diff --git a/MAINTAINERS b/MAINTAINERS
> index 3353de0..9a94395 100644
> --- a/MAINTAINERS
> +++ b/MAINTAINERS
> @@ -8023,6 +8023,11 @@ W: http://www.hisilicon.com
> F: Documentation/admin-guide/perf/hisi-pmu.rst
> F: drivers/perf/hisilicon
>
> +HISILICON HNS3 PMU DRIVER
> +M: Guangbin Huang <huangguangbin2 at huawei.com>
> +S: Supported
> +F: drivers/perf/pci/hisilicon/hns3_pmu.c
You seemed to miss the rst doc
> +
> HISILICON QM AND ZIP Controller DRIVER
> M: Zhou Wang <wangzhou1 at hisilicon.com>
> L: linux-crypto at vger.kernel.org
> diff --git a/drivers/perf/pci/Kconfig b/drivers/perf/pci/Kconfig
> index 6fd7978..ff10054 100644
> --- a/drivers/perf/pci/Kconfig
> +++ b/drivers/perf/pci/Kconfig
> @@ -13,4 +13,14 @@ config HISI_PCIE_PMU
> IEP devices.
> Adds the PCIe PMU into perf events system for monitoring latency,
> bandwidth etc.
> +
> +config HNS3_PMU
> + tristate "HNS3 PERF PMU"
> + depends on ARM64 && PCI
COMPILE_TEST?
> + default m
I don't think that this should be added
> + help
> + Provide support for HNS3 performance monitoring unit (PMU) IEP
> + devices.
> + Adds the HNS3 PMU into perf events system for monitoring latency,
> + bandwidth etc.
> endmenu
> diff --git a/drivers/perf/pci/hisilicon/Makefile b/drivers/perf/pci/hisilicon/Makefile
> index 37813b6..e6b89d8 100644
> --- a/drivers/perf/pci/hisilicon/Makefile
> +++ b/drivers/perf/pci/hisilicon/Makefile
> @@ -1,2 +1,3 @@
> # SPDX-License-Identifier: GPL-2.0-only
> obj-$(CONFIG_HISI_PCIE_PMU) += hisi_pcie_pmu.o
> +obj-$(CONFIG_HNS3_PMU) += hns3_pmu.o
> diff --git a/drivers/perf/pci/hisilicon/hns3_pmu.c b/drivers/perf/pci/hisilicon/hns3_pmu.c
> new file mode 100644
> index 0000000..f840549
> --- /dev/null
> +++ b/drivers/perf/pci/hisilicon/hns3_pmu.c
> @@ -0,0 +1,1937 @@
> +// SPDX-License-Identifier: GPL-2.0-only
> +/*
> + * This driver adds support for HNS3 PMU IEP device. Related perf events are
iEP
> + * bandwidth, latency, packet rate, interrupt rate etc.
> + *
> + * Copyright (C) 2021 HiSilicon Limited
> + */
> +#include <linux/bitfield.h>
> +#include <linux/bitmap.h>
> +#include <linux/bug.h>
> +#include <linux/cpuhotplug.h>
> +#include <linux/cpumask.h>
> +#include <linux/delay.h>
> +#include <linux/device.h>
> +#include <linux/err.h>
> +#include <linux/interrupt.h>
> +#include <linux/irq.h>
> +#include <linux/kernel.h>
> +#include <linux/list.h>
> +#include <linux/module.h>
> +#include <linux/pci.h>
> +#include <linux/perf_event.h>
> +#include <linux/smp.h>
> +
> +#define BAR_ID 2
> +
> +#define HNS3_PMU_DEVICE_ID 0xA22B
personally I don't see a point in declaring a macro for a value which is
only used once. And it's not a magic number.
> +#define HNS3_IRQ_VECTOR 0
> +#define HNS3_IRQ_VECS 1
> +
> +/* max event counters supported */
> +#define HNS3_PMU_MAX_COUNTERS 8
> +
> +/* registers offset address */
> +#define HNS3_PMU_REG_GLOBAL_CTRL 0x0000
> +#define HNS3_PMU_REG_CLOCK_FREQ 0x0020
> +#define HNS3_PMU_REG_BDF 0x0FE0
> +#define HNS3_PMU_REG_VERSION 0x0FE4
> +#define HNS3_PMU_REG_DEVICE_ID 0x0FE8
> +
> +#define HNS3_PMU_REG_EVENT_OFFSET 0x1000
> +#define HNS3_PMU_REG_EVENT_SIZE 0x1000
> +#define HNS3_PMU_REG_EVENT_CTRL_LOW 0x00
> +#define HNS3_PMU_REG_EVENT_CTRL_HIGH 0x04
> +#define HNS3_PMU_REG_EVENT_INTR_STATUS 0x08
> +#define HNS3_PMU_REG_EVENT_INTR_MASK 0x0C
> +#define HNS3_PMU_REG_EVENT_COUNTER 0x10
> +#define HNS3_PMU_REG_EVENT_EXT_COUNTER 0x18
> +#define HNS3_PMU_REG_EVENT_QID_CTRL 0x28
> +#define HNS3_PMU_REG_EVENT_QID_PARA 0x2C
> +
> +#define HNS3_PMU_FILTER_SUPPORT_GLOBAL BIT(0)
> +#define HNS3_PMU_FILTER_SUPPORT_PORT BIT(1)
> +#define HNS3_PMU_FILTER_SUPPORT_PORT_TC BIT(2)
> +#define HNS3_PMU_FILTER_SUPPORT_FUNC BIT(3)
> +#define HNS3_PMU_FILTER_SUPPORT_FUNC_QUEUE BIT(4)
> +#define HNS3_PMU_FILTER_SUPPORT_FUNC_INTR BIT(5)
> +
> +#define HNS3_PMU_FILTER_ALL_TC 0xF
> +#define HNS3_PMU_FILTER_ALL_QUEUE 0xFFFF
> +
> +#define HNS3_PMU_CTRL_SUBEVENT_S 4
> +#define HNS3_PMU_CTRL_FILTER_MODE_S 24
> +
> +#define HNS3_PMU_GLOBAL_START BIT(0)
> +
> +#define HNS3_PMU_EVENT_STATUS_RESET BIT(11)
> +#define HNS3_PMU_EVENT_EN BIT(12)
> +#define HNS3_PMU_EVENT_OVERFLOW_RESTART BIT(15)
> +
> +#define HNS3_PMU_QID_PARA_FUNC_S 0
> +#define HNS3_PMU_QID_PARA_QUEUE_S 16
> +
> +#define HNS3_PMU_QID_CTRL_REQ_ENABLE BIT(0)
> +#define HNS3_PMU_QID_CTRL_DONE BIT(1)
> +#define HNS3_PMU_QID_CTRL_MISS BIT(2)
> +
> +#define HNS3_PMU_INTR_MASK_OVERFLOW BIT(1)
> +
> +#define HNS3_PMU_FREQ_1K_HZ 1000
> +#define HNS3_PMU_FREQ_1G_HZ 1000000000
really?
> +
> +#define HNS3_PMU_INVALID_CPU_ID (-1)
> +
> +enum hns3_pmu_event_type {
> + HNS3_PMU_EVENT_TYPE_BANDWIDTH,
> + HNS3_PMU_EVENT_TYPE_PACKET_RATE,
> + HNS3_PMU_EVENT_TYPE_LATENCY,
> + HNS3_PMU_EVENT_TYPE_INTR_RATE,
> +};
> +
> +enum hns3_pmu_bandwidth_subevent_code {
> + HNS3_PMU_SUBEVT_BW_IGU_SSU,
> + HNS3_PMU_SUBEVT_BW_SSU_EGU,
> + HNS3_PMU_SUBEVT_BW_SSU_RPU,
> + HNS3_PMU_SUBEVT_BW_SSU_ROCE,
is it intended that sometimes we have _BW_XXX_SSU and sometimes _BW_SSU_YYY?
> + HNS3_PMU_SUBEVT_BW_ROCE_SSU,
> + HNS3_PMU_SUBEVT_BW_TPU_SSU,
> + HNS3_PMU_SUBEVT_BW_RPU_RCBRX,
> + HNS3_PMU_SUBEVT_BW_RCBTX_TPU,
> + HNS3_PMU_SUBEVT_BW_RCBTX_TXSCH,
> + HNS3_PMU_SUBEVT_BW_WR_FBD,
> + HNS3_PMU_SUBEVT_BW_WR_EBD,
> + HNS3_PMU_SUBEVT_BW_RD_FBD,
> + HNS3_PMU_SUBEVT_BW_RD_EBD,
> + HNS3_PMU_SUBEVT_BW_RD_PAY_M0,
> + HNS3_PMU_SUBEVT_BW_RD_PAY_M1,
> + HNS3_PMU_SUBEVT_BW_WR_PAY_M0,
> + HNS3_PMU_SUBEVT_BW_WR_PAY_M1,
> +};
> +
> +enum hns3_pmu_packet_rate_subevent_code {
> + HNS3_PMU_SUBEVT_PPS_IGU_SSU,
> + HNS3_PMU_SUBEVT_PPS_SSU_EGU,
> + HNS3_PMU_SUBEVT_PPS_SSU_RPU,
> + HNS3_PMU_SUBEVT_PPS_SSU_ROCE,
> + HNS3_PMU_SUBEVT_PPS_ROCE_SSU,
> + HNS3_PMU_SUBEVT_PPS_TPU_SSU,
> + HNS3_PMU_SUBEVT_PPS_RPU_RCBRX,
> + HNS3_PMU_SUBEVT_PPS_RCBTX_TPU,
> + HNS3_PMU_SUBEVT_PPS_RCBTX_SCH,
> + HNS3_PMU_SUBEVT_PPS_WR_FBD,
> + HNS3_PMU_SUBEVT_PPS_WR_EBD,
> + HNS3_PMU_SUBEVT_PPS_RD_FBD,
> + HNS3_PMU_SUBEVT_PPS_RD_EBD,
> + HNS3_PMU_SUBEVT_PPS_RD_PAY_M0,
> + HNS3_PMU_SUBEVT_PPS_RD_PAY_M1,
> + HNS3_PMU_SUBEVT_PPS_WR_PAY_M0,
> + HNS3_PMU_SUBEVT_PPS_WR_PAY_M1,
> + HNS3_PMU_SUBEVT_PPS_TX_PRE,
> + HNS3_PMU_SUBEVT_PPS_RX_PRE,
> +};
> +
> +enum hns3_pmu_latency_subevent_code {
> + HNS3_PMU_SUBEVT_DLY_RX_INTR,
> + HNS3_PMU_SUBEVT_DLY_RX_INTR_ROH,
> + HNS3_PMU_SUBEVT_DLY_TX_PUSH,
> + HNS3_PMU_SUBEVT_DLY_TX_PUSH_ROH,
> + HNS3_PMU_SUBEVT_DLY_TX,
> + HNS3_PMU_SUBEVT_DLY_TX_ROH,
> + HNS3_PMU_SUBEVT_DLY_SSU_TX_NIC,
> + HNS3_PMU_SUBEVT_DLY_SSU_TX_ROCE,
> + HNS3_PMU_SUBEVT_DLY_SSU_RX_NIC,
> + HNS3_PMU_SUBEVT_DLY_SSU_RX_ROCE,
> + HNS3_PMU_SUBEVT_DLY_SSU_T2R_NIC,
> + HNS3_PMU_SUBEVT_DLY_SSU_T2R_ROCE,
> + HNS3_PMU_SUBEVT_DLY_SSU_R2T_NIC,
> + HNS3_PMU_SUBEVT_DLY_SSU_R2T_ROCE,
> + HNS3_PMU_SUBEVT_DLY_RPU,
> + HNS3_PMU_SUBEVT_DLY_TPU,
> + HNS3_PMU_SUBEVT_DLY_RPE,
> + HNS3_PMU_SUBEVT_DLY_TPE,
> + HNS3_PMU_SUBEVT_DLY_TPE_PUSH,
> + HNS3_PMU_SUBEVT_DLY_WR_FBD,
> + HNS3_PMU_SUBEVT_DLY_WR_EBD,
> + HNS3_PMU_SUBEVT_DLY_RD_FBD,
> + HNS3_PMU_SUBEVT_DLY_RD_EBD,
> + HNS3_PMU_SUBEVT_DLY_RD_PAY_M0,
> + HNS3_PMU_SUBEVT_DLY_RD_PAY_M1,
> + HNS3_PMU_SUBEVT_DLY_WR_PAY_M0,
> + HNS3_PMU_SUBEVT_DLY_WR_PAY_M1,
> + HNS3_PMU_SUBEVT_DLY_INTR_MERGE,
> + HNS3_PMU_SUBEVT_DLY_MSIX_WRITE,
> +};
> +
> +enum hns3_pmu_interrupt_rate_subevent_code {
> + HNS3_PMU_SUBEVT_INTR_MSIX_NIC,
> + HNS3_PMU_SUBEVT_INTR_MSIX_ROH,
> + HNS3_PMU_SUBEVT_INTR_MERGE,
> +};
> +
> +/* filter mode supported by each bandwidth subevent code */
> +#define HNS3_PMU_FILTER_BW_IGU_SSU 0x07
> +#define HNS3_PMU_FILTER_BW_SSU_EGU 0x07
> +#define HNS3_PMU_FILTER_BW_SSU_RPU 0x1F
> +#define HNS3_PMU_FILTER_BW_SSU_ROCE 0x0F
> +#define HNS3_PMU_FILTER_BW_ROCE_SSU 0x0F
> +#define HNS3_PMU_FILTER_BW_TPU_SSU 0x1F
> +#define HNS3_PMU_FILTER_BW_RPU_RCBRX 0x11
> +#define HNS3_PMU_FILTER_BW_RCBTX_TPU 0x1F
> +#define HNS3_PMU_FILTER_BW_RCBTX_TXSCH 0x1B
> +#define HNS3_PMU_FILTER_BW_WR_FBD 0x1B
> +#define HNS3_PMU_FILTER_BW_WR_EBD 0x1B
> +#define HNS3_PMU_FILTER_BW_RD_FBD 0x1B
> +#define HNS3_PMU_FILTER_BW_RD_EBD 0x1B
> +#define HNS3_PMU_FILTER_BW_RD_PAY_M0 0x01
> +#define HNS3_PMU_FILTER_BW_RD_PAY_M1 0x01
> +#define HNS3_PMU_FILTER_BW_WR_PAY_M0 0x01
> +#define HNS3_PMU_FILTER_BW_WR_PAY_M1 0x01
> +
> +/* filter mode supported by each packet rate subevent code */
> +#define HNS3_PMU_FILTER_PPS_IGU_SSU 0x07
> +#define HNS3_PMU_FILTER_PPS_SSU_EGU 0x07
> +#define HNS3_PMU_FILTER_PPS_SSU_RPU 0x1F
> +#define HNS3_PMU_FILTER_PPS_SSU_ROCE 0x0F
> +#define HNS3_PMU_FILTER_PPS_ROCE_SSU 0x0F
> +#define HNS3_PMU_FILTER_PPS_TPU_SSU 0x1F
> +#define HNS3_PMU_FILTER_PPS_RPU_RCBRX 0x11
> +#define HNS3_PMU_FILTER_PPS_RCBTX_TPU 0x1F
> +#define HNS3_PMU_FILTER_PPS_RCBTX_SCH 0x1B
> +#define HNS3_PMU_FILTER_PPS_WR_FBD 0x1B
> +#define HNS3_PMU_FILTER_PPS_WR_EBD 0x1B
> +#define HNS3_PMU_FILTER_PPS_RD_FBD 0x1B
> +#define HNS3_PMU_FILTER_PPS_RD_EBD 0x1B
> +#define HNS3_PMU_FILTER_PPS_RD_PAY_M0 0x01
> +#define HNS3_PMU_FILTER_PPS_RD_PAY_M1 0x01
> +#define HNS3_PMU_FILTER_PPS_WR_PAY_M0 0x01
> +#define HNS3_PMU_FILTER_PPS_WR_PAY_M1 0x01
> +#define HNS3_PMU_FILTER_PPS_TX_PRE 0x21
> +#define HNS3_PMU_FILTER_PPS_RX_PRE 0x21
> +
> +/* filter mode supported by each latency subevent code */
> +#define HNS3_PMU_FILTER_DLY_RX_INTR 0x01
> +#define HNS3_PMU_FILTER_DLY_RX_INTR_ROH 0x01
> +#define HNS3_PMU_FILTER_DLY_TX_PUSH 0x01
> +#define HNS3_PMU_FILTER_DLY_TX_PUSH_ROH 0x01
> +#define HNS3_PMU_FILTER_DLY_TX 0x01
> +#define HNS3_PMU_FILTER_DLY_TX_ROH 0x01
> +#define HNS3_PMU_FILTER_DLY_SSU_TX_NIC 0x0F
> +#define HNS3_PMU_FILTER_DLY_SSU_TX_ROCE 0x0F
> +#define HNS3_PMU_FILTER_DLY_SSU_RX_NIC 0x07
> +#define HNS3_PMU_FILTER_DLY_SSU_RX_ROCE 0x07
> +#define HNS3_PMU_FILTER_DLY_SSU_T2R_NIC 0x1F
> +#define HNS3_PMU_FILTER_DLY_SSU_T2R_ROCE 0x0F
> +#define HNS3_PMU_FILTER_DLY_SSU_R2T_NIC 0x07
> +#define HNS3_PMU_FILTER_DLY_SSU_R2T_ROCE 0x07
> +#define HNS3_PMU_FILTER_DLY_RPU 0x11
> +#define HNS3_PMU_FILTER_DLY_TPU 0x1F
> +#define HNS3_PMU_FILTER_DLY_RPE 0x1B
> +#define HNS3_PMU_FILTER_DLY_TPE 0x1B
> +#define HNS3_PMU_FILTER_DLY_TPE_PUSH 0x1B
> +#define HNS3_PMU_FILTER_DLY_WR_FBD 0x1B
> +#define HNS3_PMU_FILTER_DLY_WR_EBD 0x11
> +#define HNS3_PMU_FILTER_DLY_RD_FBD 0x1B
> +#define HNS3_PMU_FILTER_DLY_RD_EBD 0x1B
> +#define HNS3_PMU_FILTER_DLY_RD_PAY_M0 0x01
> +#define HNS3_PMU_FILTER_DLY_RD_PAY_M1 0x01
> +#define HNS3_PMU_FILTER_DLY_WR_PAY_M0 0x01
> +#define HNS3_PMU_FILTER_DLY_WR_PAY_M1 0x01
> +#define HNS3_PMU_FILTER_DLY_INTR_MERGE 0x01
> +#define HNS3_PMU_FILTER_DLY_MSIX_WRITE 0x01
> +
> +/* filter mode supported by each interrupt rate subevent code */
> +#define HNS3_PMU_FILTER_INTR_MSIX_NIC 0x01
> +#define HNS3_PMU_FILTER_INTR_MSIX_ROH 0x01
> +#define HNS3_PMU_FILTER_INTR_MERGE 0x01
> +
> +/* hardware filter mode */
I don't think that this comment helps much
> +enum hns3_pmu_hw_filter_mode {
> + HNS3_PMU_HW_FILTER_GLOBAL,
> + HNS3_PMU_HW_FILTER_PORT,
> + HNS3_PMU_HW_FILTER_PORT_TC,
> + HNS3_PMU_HW_FILTER_FUNC,
> + HNS3_PMU_HW_FILTER_FUNC_QUEUE,
> + HNS3_PMU_HW_FILTER_FUNC_INTR,
> +};
> +
> +struct hns3_pmu_event_attr {
> + u8 event;
> + u8 subevent;
> + u16 filter_support;
> +};
> +
> +struct hns3_pmu {
> + struct perf_event *hw_events[HNS3_PMU_MAX_COUNTERS];
> + struct hlist_node node;
> + struct pci_dev *pdev;
> + struct pmu pmu;
> + void __iomem *base;
> + cpumask_t associated_cpus;
> + int domain_id;
> + int irq;
> + int on_cpu;
> + u32 identifier;
> + u32 hw_clk;
> + /* maximum and minimun bdf allowed by PMU */
> + u16 bdf_min;
> + u16 bdf_max;
> +};
> +
> +#define to_hns3_pmu(p) (container_of((p), struct hns3_pmu, pmu))
> +#define attr_to_dattr(a) (container_of((a), struct device_attribute, attr))
> +#define dattr_to_eattr(d) (container_of((d), struct dev_ext_attribute, attr))
> +
> +#define GET_PCI_DEVFN(bdf) ((bdf) & 0xFF)
> +
> +#define FILTER_CONDITION_PORT(port) ((1 << (port)) & 0xFF)
> +#define FILTER_CONDITION_PORT_TC(port, tc) (((port) << 3) | ((tc) & 0x07))
> +#define FILTER_CONDITION_FUNC_INTR(func, intr) (((intr) << 8) | (func))
> +
> +#define BYTES_TO_BITS(bytes) ((bytes) * 8)
> +
> +#define HNS3_PMU_FILTER_ATTR(_name, _config, _start, _end) \
> + static inline u64 hns3_get_##_name(struct perf_event *event) \
> + { \
> + return FIELD_GET(GENMASK_ULL(_end, _start), \
> + event->attr._config); \
> + }
> +
> +HNS3_PMU_FILTER_ATTR(event, config, 0, 7);
> +HNS3_PMU_FILTER_ATTR(subevent, config, 8, 15);
> +HNS3_PMU_FILTER_ATTR(port, config1, 0, 3);
> +HNS3_PMU_FILTER_ATTR(tc, config1, 4, 7);
> +HNS3_PMU_FILTER_ATTR(func, config1, 8, 23);
> +HNS3_PMU_FILTER_ATTR(queue, config1, 24, 39);
> +HNS3_PMU_FILTER_ATTR(intr, config1, 40, 51);
> +HNS3_PMU_FILTER_ATTR(global, config1, 52, 52);
> +
> +/* construct each bandwidth event */
> +#define HNS3_PMU_EVENT_CONSTRUCT_BW_IGU_SSU \
> + (&(struct hns3_pmu_event_attr) {HNS3_PMU_EVENT_TYPE_BANDWIDTH, \
> + HNS3_PMU_SUBEVT_BW_IGU_SSU, \
> + HNS3_PMU_FILTER_BW_IGU_SSU})
How about add:
#define BW_EVENT(name)\
(&(struct hns3_pmu_event_attr) {HNS3_PMU_EVENT_TYPE_BANDWIDTH,\
HNS3_PMU_SUBEVT_BW_#name, \
HNS3_PMU_FILTER_BW_#name})
#define HNS3_PMU_EVENT_CONSTRUCT_BW_SSU_EGU BW_EVENT(SSU_EGU)
As above, I couldn't apply the patch to experiment.
> +static ssize_t hns3_pmu_sysfs_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct dev_ext_attribute *eattr;
> +
> + eattr = container_of(attr, struct dev_ext_attribute, attr);
> +
> + return sprintf(buf, "%s\n", (char *)eattr->var);
> +}
> +
> +static ssize_t hns3_pmu_event_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct hns3_pmu_event_attr *event;
> + struct dev_ext_attribute *eattr;
> +
> + eattr = container_of(attr, struct dev_ext_attribute, attr);
> + event = (struct hns3_pmu_event_attr *)eattr->var;
> +
> + return sprintf(buf, "event=%#x, subevent=%#x\n", event->event,
> + event->subevent);
see comment on rst file about a single value per sysfs file
> +}
> +
> +static ssize_t hns3_pmu_filter_mode_show(struct device *dev,
> + struct device_attribute *attr,
> + char *buf)
> +{
> + struct hns3_pmu_event_attr *event;
> + struct dev_ext_attribute *eattr;
> + int ret;
> +
> + eattr = container_of(attr, struct dev_ext_attribute, attr);
> + event = (struct hns3_pmu_event_attr *)eattr->var;
> +
> + ret = sprintf(buf, "filter mode supported: ");
> + if (event->filter_support & HNS3_PMU_FILTER_SUPPORT_GLOBAL)
> + ret += sprintf(buf + ret, "global/");
> + if (event->filter_support & HNS3_PMU_FILTER_SUPPORT_PORT)
> + ret += sprintf(buf + ret, "port/");
> + if (event->filter_support & HNS3_PMU_FILTER_SUPPORT_PORT_TC)
> + ret += sprintf(buf + ret, "port-tc/");
> + if (event->filter_support & HNS3_PMU_FILTER_SUPPORT_FUNC)
> + ret += sprintf(buf + ret, "func/");
> + if (event->filter_support & HNS3_PMU_FILTER_SUPPORT_FUNC_QUEUE)
> + ret += sprintf(buf + ret, "func-queue/");
> + if (event->filter_support & HNS3_PMU_FILTER_SUPPORT_FUNC_INTR)
> + ret += sprintf(buf + ret, "func-intr/");
> +
> + ret += sprintf(buf + ret, "\n");
> +
as above
> + return ret;
> +}
> +
> +#define HNS3_PMU_ATTR(_name, _func, _config) \
> + (&((struct dev_ext_attribute[]) { \
> + { __ATTR(_name, 0444, _func, NULL), (void *)_config } \
> + })[0].attr.attr)
> +
> +#define HNS3_PMU_FORMAT_ATTR(_name, _format) \
> + HNS3_PMU_ATTR(_name, hns3_pmu_sysfs_show, (void *)_format)
> +#define HNS3_PMU_EVENT_ATTR(_name, _event) \
> + HNS3_PMU_ATTR(_name, hns3_pmu_event_show, (void *)_event)
> +
> +static u8 hns3_pmu_hw_filter_modes[] = {
> + HNS3_PMU_HW_FILTER_GLOBAL,
> + HNS3_PMU_HW_FILTER_PORT,
> + HNS3_PMU_HW_FILTER_PORT_TC,
> + HNS3_PMU_HW_FILTER_FUNC,
> + HNS3_PMU_HW_FILTER_FUNC_QUEUE,
> + HNS3_PMU_HW_FILTER_FUNC_INTR
> +};
> +
> +#define HNS3_PMU_SET_HW_FILTER(_hwc, _mode) \
> + ((_hwc)->addr_filters = (void *)&hns3_pmu_hw_filter_modes[(_mode)])
> +
> +static ssize_t identifier_show(struct device *dev,
> + struct device_attribute *attr, char *buf)
> +{
> + struct hns3_pmu *hns3_pmu;
> +
> + hns3_pmu = to_hns3_pmu(dev_get_drvdata(dev));
> +
> + return sprintf(buf, "%#x\n", hns3_pmu->identifier);
generally we prefix 0x to hex numbers to avoid doubt
> +}
> +static DEVICE_ATTR_RO(identifier);
> +
> +static ssize_t cpumask_show(struct device *dev, struct device_attribute *attr,
> + char *buf)
> +{
> + struct hns3_pmu *hns3_pmu;
> +
> + hns3_pmu = to_hns3_pmu(dev_get_drvdata(dev));
> +
> + return sprintf(buf, "%d\n", hns3_pmu->on_cpu);
> +}
> +static DEVICE_ATTR_RO(cpumask);
> +
> +static struct attribute *hns3_pmu_events_attr[] = {
> + /* bandwidth events */
> + HNS3_PMU_EVENT_ATTR(bw_igu_ssu,
> + HNS3_PMU_EVENT_CONSTRUCT_BW_IGU_SSU),
> + HNS3_PMU_EVENT_ATTR(bw_ssu_egu,
> + HNS3_PMU_EVENT_CONSTRUCT_BW_SSU_EGU),
> + HNS3_PMU_EVENT_ATTR(bw_ssu_rpu,
... so many events. I'd say perf list is big...
HNS3_PMU_EVENT_CONSTRUCT_INTR_MERGE),
> + NULL
> +};
> +
> +static struct attribute_group hns3_pmu_events_group = {
> + .name = "events",
> + .attrs = hns3_pmu_events_attr,
> +};
> +
> +static struct attribute_group hns3_pmu_filter_mode_group = {
> + .name = "filtermode",
> +};
> +
> +static struct attribute *hns3_pmu_format_attr[] = {
> + HNS3_PMU_FORMAT_ATTR(event, "config:0-7"),
> + HNS3_PMU_FORMAT_ATTR(subevent, "config:8-15"),
> + HNS3_PMU_FORMAT_ATTR(port, "config1:0-3"),
> + HNS3_PMU_FORMAT_ATTR(tc, "config1:4-7"),
> + HNS3_PMU_FORMAT_ATTR(func, "config1:8-23"),
> + HNS3_PMU_FORMAT_ATTR(queue, "config1:24-39"),
> + HNS3_PMU_FORMAT_ATTR(intr, "config1:40-51"),
> + HNS3_PMU_FORMAT_ATTR(global, "config1:52-52"),
> + NULL
> +};
> +
> +static struct attribute_group hns3_pmu_format_group = {
> + .name = "format",
> + .attrs = hns3_pmu_format_attr,
> +};
> +
> +static struct attribute *hns3_pmu_cpumask_attrs[] = {
> + &dev_attr_cpumask.attr,
> + NULL
> +};
> +
> +static struct attribute_group hns3_pmu_cpumask_attr_group = {
> + .attrs = hns3_pmu_cpumask_attrs,
> +};
> +
> +static struct attribute *hns3_pmu_identifier_attrs[] = {
> + &dev_attr_identifier.attr,
> + NULL
> +};
> +
> +static struct attribute_group hns3_pmu_identifier_attr_group = {
> + .attrs = hns3_pmu_identifier_attrs,
> +};
> +
> +static const struct attribute_group *hns3_pmu_attr_groups[] = {
> + &hns3_pmu_events_group,
> + &hns3_pmu_filter_mode_group,
> + &hns3_pmu_format_group,
> + &hns3_pmu_cpumask_attr_group,
> + &hns3_pmu_identifier_attr_group,
> + NULL
> +};
> +
> +static int hns3_pmu_init_filter_mode_group(void)
> +{
> + u32 group_size = ARRAY_SIZE(hns3_pmu_events_attr);
> + struct dev_ext_attribute *eattr_filter;
> + struct dev_ext_attribute *eattr_event;
> + struct device_attribute *dattr_event;
> + struct attribute **attr_filter;
> + struct attribute *attr_event;
> + u32 i;
> +
> + attr_filter = kcalloc(group_size, sizeof(struct attribute *),
> + GFP_KERNEL);
> + if (!attr_filter)
> + return -ENOMEM;
do we really need dynamic memory for all of this? I seem to recall
asking this all before...
> +
> + eattr_filter = kcalloc(group_size - 1, sizeof(struct dev_ext_attribute),
> + GFP_KERNEL);
> + if (!eattr_filter) {
> + kfree(attr_filter);
> + return -ENOMEM;
> + }
> +
> + for (i = 0; i < group_size - 1; i++) {
> + attr_event = hns3_pmu_events_attr[i];
> + dattr_event = attr_to_dattr(attr_event);
> + eattr_event = dattr_to_eattr(dattr_event);
> +
> + memcpy(&eattr_filter[i], eattr_event,
> + sizeof(struct dev_ext_attribute));
> + eattr_filter[i].attr.show = hns3_pmu_filter_mode_show;
> +
> + attr_filter[i] = &eattr_filter[i].attr.attr;
> + }
> +
> + hns3_pmu_filter_mode_group.attrs = attr_filter;
> +
> + return 0;
> +}
> +
> +static void hns3_pmu_uinit_filter_mode_group(void)
Any function which accepts no argument and returns nothing is
suspicious. See comment about dynamic memory allocation earlier.
> +{
> + struct dev_ext_attribute *eattr;
> + struct device_attribute *dattr;
> + struct attribute **attrs;
> +
> + attrs = hns3_pmu_filter_mode_group.attrs;
> + dattr = attr_to_dattr(attrs[0]);
> + eattr = dattr_to_eattr(dattr);
> +
> + kfree(eattr);
> + kfree(attrs);
> +
> + hns3_pmu_filter_mode_group.attrs = NULL;
> +}
> +
> +static u32 hns3_pmu_get_offset(u32 offset, u32 idx)
> +{
> + return offset + HNS3_PMU_REG_EVENT_OFFSET +
> + HNS3_PMU_REG_EVENT_SIZE * idx;
> +}
> +
> +static u32 hns3_pmu_readl(struct hns3_pmu *hns3_pmu, u32 reg_offset, u32 idx)
> +{
> + u32 offset = hns3_pmu_get_offset(reg_offset, idx);
> +
> + return readl(hns3_pmu->base + offset);
> +}
> +
> +static void hns3_pmu_writel(struct hns3_pmu *hns3_pmu, u32 reg_offset, u32 idx,
> + u32 val)
> +{
> + u32 offset = hns3_pmu_get_offset(reg_offset, idx);
> +
> + writel(val, hns3_pmu->base + offset);
> +}
> +
> +static u64 hns3_pmu_readq(struct hns3_pmu *hns3_pmu, u32 reg_offset, u32 idx)
> +{
> + u32 offset = hns3_pmu_get_offset(reg_offset, idx);
> +
> + return readq(hns3_pmu->base + offset);
> +}
> +
> +static void hns3_pmu_writeq(struct hns3_pmu *hns3_pmu, u32 reg_offset, u32 idx,
> + u64 val)
> +{
> + u32 offset = hns3_pmu_get_offset(reg_offset, idx);
> +
> + writeq(val, hns3_pmu->base + offset);
> +}
> +
> +static int hns3_pmu_get_event_idx(struct hns3_pmu *hns3_pmu)
> +{
> + int idx;
> +
> + for (idx = 0; idx < HNS3_PMU_MAX_COUNTERS; idx++)
> + if (!hns3_pmu->hw_events[idx])
> + return idx;
> +
> + return -EBUSY;
> +}
> +
> +static bool hns3_pmu_valid_bdf(struct hns3_pmu *hns3_pmu, u16 bdf)
> +{
> + struct pci_dev *pci_dev;
> + u8 bus, devfn;
> +
> + if (bdf < hns3_pmu->bdf_min || bdf > hns3_pmu->bdf_max) {
> + pci_err(hns3_pmu->pdev, "Invalid EP device: %#x!\n", bdf);
> + return false;
> + }
> +
> + bus = PCI_BUS_NUM(bdf);
> + devfn = GET_PCI_DEVFN(bdf);
> + pci_dev = pci_get_domain_bus_and_slot(hns3_pmu->domain_id, bus, devfn);
> + if (!pci_dev) {
> + pci_err(hns3_pmu->pdev, "Nonexistent EP device: %#x!\n", bdf);
> + return false;
> + }
> +
> + pci_dev_put(pci_dev);
> + return true;
> +}
> +
> +static void hns3_pmu_set_qid_para(struct hns3_pmu *hns3_pmu, u32 idx, u16 bdf,
> + u16 queue)
> +{
> + u32 val;
> +
> + val = GET_PCI_DEVFN(bdf);
> + val |= (u32)queue << HNS3_PMU_QID_PARA_QUEUE_S;
> + hns3_pmu_writel(hns3_pmu, HNS3_PMU_REG_EVENT_QID_PARA, idx, val);
> +}
> +
> +static bool hns3_pmu_qid_req_start(struct hns3_pmu *hns3_pmu, u32 idx)
> +{
> +#define HNS3_PMU_QID_REQ_WAIT_TIMES 5
> +
> + bool queue_id_valid = false;
> + u32 cnt = 0;
> + u32 val;
> +
> + /* enable queue id request */
> + hns3_pmu_writel(hns3_pmu, HNS3_PMU_REG_EVENT_QID_CTRL, idx,
> + HNS3_PMU_QID_CTRL_REQ_ENABLE);
> +
> + while (cnt < HNS3_PMU_QID_REQ_WAIT_TIMES) {
> + val = hns3_pmu_readl(hns3_pmu,
> + HNS3_PMU_REG_EVENT_QID_CTRL, idx);
> + if (val & HNS3_PMU_QID_CTRL_DONE) {
> + queue_id_valid = (val & HNS3_PMU_QID_CTRL_MISS) == 0;
> + break;
> + }
> +
> + cnt++;
> + /* sleep at least 1ms to wait for hardware checks qid done */
> + usleep_range(1000, 2000);
readl_poll_timeout()?
> + }
> +
> + /* disable qid request and clear status */
> + hns3_pmu_writel(hns3_pmu, HNS3_PMU_REG_EVENT_QID_CTRL, idx, 0);
> +
> + return queue_id_valid;
> +}
> +
> +static bool hns3_pmu_valid_queue(struct hns3_pmu *hns3_pmu, u32 idx, u16 bdf,
> + u16 queue)
> +{
> + hns3_pmu_set_qid_para(hns3_pmu, idx, bdf, queue);
> +
> + return hns3_pmu_qid_req_start(hns3_pmu, idx);
> +}
> +
> +static struct hns3_pmu_event_attr *hns3_pmu_get_pmu_event(u8 event, u8 subevent)
> +{
> + struct hns3_pmu_event_attr *pmu_event;
> + struct dev_ext_attribute *eattr;
> + struct device_attribute *dattr;
> + struct attribute *attr;
> + u32 i;
> +
> + for (i = 0; i < ARRAY_SIZE(hns3_pmu_events_attr) - 1; i++) {
> + attr = hns3_pmu_events_attr[i];
> + dattr = container_of(attr, struct device_attribute, attr);
> + eattr = container_of(dattr, struct dev_ext_attribute, attr);
> + pmu_event = (struct hns3_pmu_event_attr *)eattr->var;
> +
> + if (event == pmu_event->event &&
> + subevent == pmu_event->subevent)
> + return pmu_event;
> + }
> +
> + return NULL;
> +}
> +
> +static int hns3_pmu_set_func_mode(struct perf_event *event,
> + struct hns3_pmu *hns3_pmu)
> +{
> + struct hw_perf_event *hwc = &event->hw;
> + u16 func_bdf = hns3_get_func(event);
> +
> + if (!hns3_pmu_valid_bdf(hns3_pmu, func_bdf))
> + return -ENOENT;
> +
> + HNS3_PMU_SET_HW_FILTER(hwc, HNS3_PMU_HW_FILTER_FUNC);
> +
> + return 0;
> +}
> +
> +static int hns3_pmu_set_func_queue_mode(struct perf_event *event,
> + struct hns3_pmu *hns3_pmu)
> +{
> + struct hw_perf_event *hwc = &event->hw;
> + u16 queue_id = hns3_get_queue(event);
> + u16 func_bdf = hns3_get_func(event);
> +
> + if (!hns3_pmu_valid_bdf(hns3_pmu, func_bdf))
> + return -ENOENT;
> +
> + if (!hns3_pmu_valid_queue(hns3_pmu, hwc->idx, func_bdf, queue_id)) {
> + pci_err(hns3_pmu->pdev, "Invalid queue: %u\n", queue_id);
> + return -ENOENT;
> + }
> +
> + HNS3_PMU_SET_HW_FILTER(hwc, HNS3_PMU_HW_FILTER_FUNC_QUEUE);
> +
> + return 0;
> +}
> +
> +static bool hns3_pmu_check_global_mode(struct perf_event *event,
> + struct hns3_pmu_event_attr *pmu_event)
> +{
> + u8 global = hns3_get_global(event);
> +
> + return pmu_event->filter_support & HNS3_PMU_FILTER_SUPPORT_GLOBAL &&
> + global;
> +}
> +
> +static bool hns3_pmu_check_func_mode(struct perf_event *event,
> + struct hns3_pmu_event_attr *pmu_event)
what are you checking? "check" in a function name is too vague
"is_supported" or "is_enabled" are better terms
> +{
> + u16 queue_id = hns3_get_queue(event);
> + u16 func_bdf = hns3_get_func(event);
> +
> + return pmu_event->filter_support & HNS3_PMU_FILTER_SUPPORT_FUNC &&
> + queue_id == HNS3_PMU_FILTER_ALL_QUEUE && func_bdf;
logical AND on u16 looks strange (func_bdf is what I am referring to)
> +}
> +
> +static bool
> +hns3_pmu_check_func_queue_mode(struct perf_event *event,
> + struct hns3_pmu_event_attr *pmu_event)
> +{
> + u16 queue_id = hns3_get_queue(event);
> + u16 func_bdf = hns3_get_func(event);
> +
> + return pmu_event->filter_support & HNS3_PMU_FILTER_SUPPORT_FUNC_QUEUE &&
> + queue_id != HNS3_PMU_FILTER_ALL_QUEUE && func_bdf;
> +}
> +
> +static bool hns3_pmu_check_port_mode(struct perf_event *event,
> + struct hns3_pmu_event_attr *pmu_event)
> +{
> + u8 tc_id = hns3_get_tc(event);
> +
> + return pmu_event->filter_support & HNS3_PMU_FILTER_SUPPORT_PORT &&
> + tc_id == HNS3_PMU_FILTER_ALL_TC;
> +}
> +
> +static bool hns3_pmu_check_port_tc_mode(struct perf_event *event,
> + struct hns3_pmu_event_attr *pmu_event)
> +{
> + u8 tc_id = hns3_get_tc(event);
> +
> + return pmu_event->filter_support & HNS3_PMU_FILTER_SUPPORT_PORT_TC &&
> + tc_id != HNS3_PMU_FILTER_ALL_TC;
> +}
> +
> +static bool hns3_pmu_check_func_intr_mode(struct perf_event *event,
> + struct hns3_pmu *hns3_pmu,
> + struct hns3_pmu_event_attr *pmu_event)
> +{
> + u16 func_bdf = hns3_get_func(event);
> +
> + return pmu_event->filter_support & HNS3_PMU_FILTER_SUPPORT_FUNC_INTR &&
> + hns3_pmu_valid_bdf(hns3_pmu, func_bdf);
> +}
> +
> +static int hns3_pmu_check_config(struct perf_event *event,
> + struct hns3_pmu *hns3_pmu)
please explain what this function is supposed to be doing. It is quite a
strange style, to say the least.
> +{
> + struct hns3_pmu_event_attr *pmu_event;
> + struct hw_perf_event *hwc = &event->hw;
> + u8 subevent_id = hns3_get_subevent(event);
> + u8 event_id = hns3_get_event(event);
> +
> + pmu_event = hns3_pmu_get_pmu_event(event_id, subevent_id);
> + if (!pmu_event) {
> + pci_err(hns3_pmu->pdev, "Invalid pmu event\n");
> + return -ENOENT;
> + }
> +
> + if (hns3_pmu_check_global_mode(event, pmu_event)) {
> + HNS3_PMU_SET_HW_FILTER(hwc, HNS3_PMU_HW_FILTER_GLOBAL);
> + return 0;
> + }
> +
> + if (hns3_pmu_check_func_mode(event, pmu_event))
> + return hns3_pmu_set_func_mode(event, hns3_pmu);
> +
> + if (hns3_pmu_check_func_queue_mode(event, pmu_event))
> + return hns3_pmu_set_func_queue_mode(event, hns3_pmu);
> +
> + if (hns3_pmu_check_port_mode(event, pmu_event)) {
> + HNS3_PMU_SET_HW_FILTER(hwc, HNS3_PMU_HW_FILTER_PORT);
> + return 0;
> + }
> +
> + if (hns3_pmu_check_port_tc_mode(event, pmu_event)) {
> + HNS3_PMU_SET_HW_FILTER(hwc, HNS3_PMU_HW_FILTER_PORT_TC);
> + return 0;
> + }
> +
> + if (hns3_pmu_check_func_intr_mode(event, hns3_pmu, pmu_event)) {
> + HNS3_PMU_SET_HW_FILTER(hwc, HNS3_PMU_HW_FILTER_FUNC_INTR);
> + return 0;
> + }
> +
> + return -ENOENT;
> +}
> +
> +static bool hns3_pmu_validate_event_group(struct perf_event *event)
> +{
> + struct perf_event *leader = event->group_leader;
> + struct perf_event *sibling;
> + int counters = 1;
> +
> + if (!is_software_event(leader)) {
> + /*
> + * We must NOT create groups containing mixed PMUs, although
> + * software events are acceptable
> + */
> + if (leader->pmu != event->pmu)
> + return false;
> +
> + /* Increase counter for the leader */
> + if (leader != event)
> + counters++;
> + }
> +
> + for_each_sibling_event(sibling, event->group_leader) {
> + if (is_software_event(sibling))
> + continue;
> +
> + if (sibling->pmu != event->pmu)
> + return false;
> +
> + /* Increase counter for each sibling */
> + counters++;
> + }
> +
> + return counters <= HNS3_PMU_MAX_COUNTERS;
> +}
> +
> +static u32 hns3_pmu_get_filter_condition(struct perf_event *event)
> +{
> + struct hw_perf_event *hwc = &event->hw;
> + u16 func_bdf = hns3_get_func(event);
> + u16 intr_id = hns3_get_intr(event);
> + u8 port_id = hns3_get_port(event);
> + u8 tc_id = hns3_get_tc(event);
> + u8 filter_mode;
> + u32 filter = 0;
> +
> + filter_mode = *(u8 *)hwc->addr_filters;
> + switch (filter_mode) {
> + case HNS3_PMU_HW_FILTER_PORT:
> + filter = FILTER_CONDITION_PORT(port_id);
> + break;
> + case HNS3_PMU_HW_FILTER_PORT_TC:
> + filter = FILTER_CONDITION_PORT_TC(port_id, tc_id);
> + break;
> + case HNS3_PMU_HW_FILTER_FUNC:
> + case HNS3_PMU_HW_FILTER_FUNC_QUEUE:
> + filter = GET_PCI_DEVFN(func_bdf);
> + break;
> + case HNS3_PMU_HW_FILTER_FUNC_INTR:
> + filter = FILTER_CONDITION_FUNC_INTR(GET_PCI_DEVFN(func_bdf),
> + intr_id);
> + break;
> + default:
> + break;
> + }
> +
> + return filter;
> +}
> +
> +static void hns3_pmu_config_filter(struct perf_event *event)
> +{
> + struct hns3_pmu *hns3_pmu = to_hns3_pmu(event->pmu);
> + struct hw_perf_event *hwc = &event->hw;
> + u8 filter_mode = *(u8 *)hwc->addr_filters;
> + u8 subevent_id = hns3_get_subevent(event);
> + u16 queue_id = hns3_get_queue(event);
> + u8 event_id = hns3_get_event(event);
> + u16 func_bdf = hns3_get_func(event);
> + u32 idx = hwc->idx;
> + u32 val;
> +
> + val = event_id;
> + val |= subevent_id << HNS3_PMU_CTRL_SUBEVENT_S;
> + val |= filter_mode << HNS3_PMU_CTRL_FILTER_MODE_S;
> + val |= HNS3_PMU_EVENT_OVERFLOW_RESTART;
> + hns3_pmu_writel(hns3_pmu, HNS3_PMU_REG_EVENT_CTRL_LOW, idx, val);
> +
> + val = hns3_pmu_get_filter_condition(event);
> + hns3_pmu_writel(hns3_pmu, HNS3_PMU_REG_EVENT_CTRL_HIGH, idx, val);
> +
> + if (filter_mode == HNS3_PMU_HW_FILTER_FUNC_QUEUE)
> + hns3_pmu_set_qid_para(hns3_pmu, idx, func_bdf, queue_id);
> +}
> +
> +static void hns3_pmu_enable_counter(struct hns3_pmu *hns3_pmu,
> + struct hw_perf_event *hwc)
> +{
> + u32 idx = hwc->idx;
> + u32 val;
> +
> + val = hns3_pmu_readl(hns3_pmu, HNS3_PMU_REG_EVENT_CTRL_LOW, idx);
> + val |= HNS3_PMU_EVENT_EN;
> + hns3_pmu_writel(hns3_pmu, HNS3_PMU_REG_EVENT_CTRL_LOW, idx, val);
> +}
> +
> +static void hns3_pmu_disable_counter(struct hns3_pmu *hns3_pmu,
> + struct hw_perf_event *hwc)
> +{
> + u32 idx = hwc->idx;
> + u32 val;
> +
> + val = hns3_pmu_readl(hns3_pmu, HNS3_PMU_REG_EVENT_CTRL_LOW, idx);
> + val &= ~HNS3_PMU_EVENT_EN;
> + hns3_pmu_writel(hns3_pmu, HNS3_PMU_REG_EVENT_CTRL_LOW, idx, val);
> +}
> +
> +static void hns3_pmu_enable_intr(struct hns3_pmu *hns3_pmu,
> + struct hw_perf_event *hwc)
> +{
> + u32 idx = hwc->idx;
> + u32 val;
> +
> + val = hns3_pmu_readl(hns3_pmu, HNS3_PMU_REG_EVENT_INTR_MASK, idx);
> + val &= ~HNS3_PMU_INTR_MASK_OVERFLOW;
> + hns3_pmu_writel(hns3_pmu, HNS3_PMU_REG_EVENT_INTR_MASK, idx, val);
> +}
> +
> +static void hns3_pmu_disable_intr(struct hns3_pmu *hns3_pmu,
> + struct hw_perf_event *hwc)
> +{
> + u32 idx = hwc->idx;
> + u32 val;
> +
> + val = hns3_pmu_readl(hns3_pmu, HNS3_PMU_REG_EVENT_INTR_MASK, idx);
> + val |= HNS3_PMU_INTR_MASK_OVERFLOW;
> + hns3_pmu_writel(hns3_pmu, HNS3_PMU_REG_EVENT_INTR_MASK, idx, val);
> +}
> +
> +static void hns3_pmu_clear_intr_status(struct hns3_pmu *hns3_pmu, u32 idx)
> +{
> + u32 val;
> +
> + val = hns3_pmu_readl(hns3_pmu, HNS3_PMU_REG_EVENT_CTRL_LOW, idx);
> + val |= HNS3_PMU_EVENT_STATUS_RESET;
> + hns3_pmu_writel(hns3_pmu, HNS3_PMU_REG_EVENT_CTRL_LOW, idx, val);
> +
> + val = hns3_pmu_readl(hns3_pmu, HNS3_PMU_REG_EVENT_CTRL_LOW, idx);
> + val &= ~HNS3_PMU_EVENT_STATUS_RESET;
> + hns3_pmu_writel(hns3_pmu, HNS3_PMU_REG_EVENT_CTRL_LOW, idx, val);
> +}
> +
> +static void hns3_pmu_read_counter(struct perf_event *event, u64 *cnt,
> + u64 *cnt_ext)
> +{
> + struct hns3_pmu *hns3_pmu = to_hns3_pmu(event->pmu);
> + u32 idx = event->hw.idx;
> +
> + *cnt = hns3_pmu_readq(hns3_pmu, HNS3_PMU_REG_EVENT_COUNTER, idx);
> + *cnt_ext = hns3_pmu_readq(hns3_pmu, HNS3_PMU_REG_EVENT_EXT_COUNTER,
> + idx);
> +}
> +
> +static void hns3_pmu_write_counter(struct perf_event *event, u64 cnt,
> + u64 cnt_ext)
> +{
> + struct hns3_pmu *hns3_pmu = to_hns3_pmu(event->pmu);
> + u32 idx = event->hw.idx;
> +
> + hns3_pmu_writeq(hns3_pmu, HNS3_PMU_REG_EVENT_COUNTER, idx, cnt);
> + hns3_pmu_writeq(hns3_pmu, HNS3_PMU_REG_EVENT_EXT_COUNTER, idx, cnt_ext);
> +}
> +
> +static void hns3_pmu_init_counter(struct perf_event *event)
> +{
> + struct hw_perf_event *hwc = &event->hw;
> + struct hw_perf_event_extra *hwc_ext;
> +
> + hwc_ext = &hwc->extra_reg;
> + local64_set(&hwc->prev_count, 0);
> + hwc_ext->config = 0;
> + hns3_pmu_write_counter(event, 0, 0);
> +}
> +
> +static u64 hns3_pmu_tick_to_ms(u32 hw_clk, u64 ticks)
what hw_clk is this?
> +{
> + u64 time_ms = ticks / (hw_clk / HNS3_PMU_FREQ_1K_HZ);
> +
> + if (!time_ms)
> + time_ms = 1;
> +
> + return time_ms;
> +}
> +
> +static u64 hns3_pmu_calculate(u8 event_type, u32 hw_clk, u64 val, u64 val_ext)
calculate what? The arguments are totally cryptic.
> +{
> + u64 result;
> +
> + if (!hw_clk || !val || !val_ext)
> + return 0;
> +
> + switch (event_type) {
> + /* val: byte number, val_ext: timer ticks number */
> + case HNS3_PMU_EVENT_TYPE_BANDWIDTH:
> + /* process data to set unit of bandwidth as "KBits/s" */
> + result = val / hns3_pmu_tick_to_ms(hw_clk, val_ext);
> + result = BYTES_TO_BITS(result);
> + break;
> +
> + /* val: packet number, val_ext: timer ticks number */
> + case HNS3_PMU_EVENT_TYPE_PACKET_RATE:
> + /* val: interrupt number, val_ext: timer ticks number */
> + case HNS3_PMU_EVENT_TYPE_INTR_RATE:
> + /* process data to set unit as "pps" */
> + result = val * HNS3_PMU_FREQ_1K_HZ /
> + hns3_pmu_tick_to_ms(hw_clk, val_ext);
> + break;
> +
> + /* val: timer ticks number, val_ext: packet number */
> + case HNS3_PMU_EVENT_TYPE_LATENCY:
> + /* process data to set unit of latency as "ns" */
> + result = val / val_ext;
> + result = result * HNS3_PMU_FREQ_1G_HZ / hw_clk;
> + break;
> +
> + default:
> + result = val / val_ext;
> + break;
> + }
> +
> + return result;
> +}
> +
> +static int hns3_pmu_event_init(struct perf_event *event)
> +{
> + struct hns3_pmu *hns3_pmu = to_hns3_pmu(event->pmu);
> + struct hw_perf_event *hwc = &event->hw;
> + int idx;
> + int ret;
> +
> + if (event->attr.type != event->pmu->type)
> + return -ENOENT;
> +
> + /* Sampling is not supported */
> + if (is_sampling_event(event) || event->attach_state & PERF_ATTACH_TASK)
> + return -EOPNOTSUPP;
> +
> + if (hns3_pmu->on_cpu < 0) {
> + pci_err(hns3_pmu->pdev, "PMU has no online CPU.\n");
> + return -EINVAL;
> + }
> +
> + idx = hns3_pmu_get_event_idx(hns3_pmu);
> + if (idx < 0) {
> + pci_err(hns3_pmu->pdev, "Up to %u events are supported!\n",
> + HNS3_PMU_MAX_COUNTERS);
> + return -EBUSY;
> + }
> +
> + hwc->idx = idx;
> + event->cpu = hns3_pmu->on_cpu;
> +
> + ret = hns3_pmu_check_config(event, hns3_pmu);
> + if (ret) {
> + pci_err(hns3_pmu->pdev, "Invalid filter, ret = %d.\n", ret);
> + return ret;
> + }
> +
> + if (!hns3_pmu_validate_event_group(event)) {
> + pci_err(hns3_pmu->pdev, "Invalid event group.\n");
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static void hns3_pmu_read(struct perf_event *event)
> +{
> + struct hns3_pmu *hns3_pmu = to_hns3_pmu(event->pmu);
> + struct hw_perf_event *hwc = &event->hw;
> + struct hw_perf_event_extra *hwc_ext;
> + u64 new_cnt_ext, prev_cnt_ext;
> + u64 new_cnt, prev_cnt, delta;
> +
> + hwc_ext = &hwc->extra_reg;
> + do {
> + prev_cnt = local64_read(&hwc->prev_count);
> + prev_cnt_ext = hwc_ext->config;
> + hns3_pmu_read_counter(event, &new_cnt, &new_cnt_ext);
> + } while (local64_cmpxchg(&hwc->prev_count, prev_cnt, new_cnt) !=
> + prev_cnt);
> +
> + hwc_ext->config = new_cnt_ext;
> +
> + delta = hns3_pmu_calculate(hns3_get_event(event), hns3_pmu->hw_clk,
> + new_cnt - prev_cnt,
> + new_cnt_ext - prev_cnt_ext);
> +
> + local64_add(delta, &event->count);
> +}
> +
> +static void hns3_pmu_start(struct perf_event *event, int flags)
> +{
> + struct hns3_pmu *hns3_pmu = to_hns3_pmu(event->pmu);
> + struct hw_perf_event *hwc = &event->hw;
> +
> + if (WARN_ON_ONCE(!(hwc->state & PERF_HES_STOPPED)))
> + return;
> +
> + WARN_ON_ONCE(!(hwc->state & PERF_HES_UPTODATE));
> + hwc->state = 0;
> +
> + hns3_pmu_config_filter(event);
> + hns3_pmu_init_counter(event);
> + hns3_pmu_enable_intr(hns3_pmu, hwc);
> + hns3_pmu_enable_counter(hns3_pmu, hwc);
> +
> + perf_event_update_userpage(event);
> +}
> +
> +static void hns3_pmu_stop(struct perf_event *event, int flags)
> +{
> + struct hns3_pmu *hns3_pmu = to_hns3_pmu(event->pmu);
> + struct hw_perf_event *hwc = &event->hw;
> +
> + hns3_pmu_disable_counter(hns3_pmu, hwc);
> + hns3_pmu_disable_intr(hns3_pmu, hwc);
> +
> + WARN_ON_ONCE(hwc->state & PERF_HES_STOPPED);
> + hwc->state |= PERF_HES_STOPPED;
> +
> + if (hwc->state & PERF_HES_UPTODATE)
> + return;
> +
> + /* Read hardware counter and update the perf counter statistics */
> + hns3_pmu_read(event);
> + hwc->state |= PERF_HES_UPTODATE;
> +}
> +
> +static int hns3_pmu_add(struct perf_event *event, int flags)
> +{
> + struct hns3_pmu *hns3_pmu = to_hns3_pmu(event->pmu);
> + struct hw_perf_event *hwc = &event->hw;
> + int idx;
> +
> + hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE;
> +
> + /* Get an available counter index for counting */
> + idx = hns3_pmu_get_event_idx(hns3_pmu);
> + if (idx < 0)
> + return idx;
> +
> + hwc->idx = idx;
> + hns3_pmu->hw_events[idx] = event;
> +
> + if (flags & PERF_EF_START)
> + hns3_pmu_start(event, PERF_EF_RELOAD);
> +
> + return 0;
> +}
> +
> +static void hns3_pmu_del(struct perf_event *event, int flags)
> +{
> + struct hns3_pmu *hns3_pmu = to_hns3_pmu(event->pmu);
> + struct hw_perf_event *hwc = &event->hw;
> +
> + hns3_pmu_stop(event, PERF_EF_UPDATE);
> + hns3_pmu->hw_events[hwc->idx] = NULL;
> + perf_event_update_userpage(event);
> +}
> +
> +static void hns3_pmu_enable(struct pmu *pmu)
> +{
> + struct hns3_pmu *hns3_pmu = to_hns3_pmu(pmu);
> + u32 val;
> +
> + val = readl(hns3_pmu->base + HNS3_PMU_REG_GLOBAL_CTRL);
> + val |= HNS3_PMU_GLOBAL_START;
> + writel(val, hns3_pmu->base + HNS3_PMU_REG_GLOBAL_CTRL);
> +}
> +
> +static void hns3_pmu_disable(struct pmu *pmu)
> +{
> + struct hns3_pmu *hns3_pmu = to_hns3_pmu(pmu);
> + u32 val;
> +
> + val = readl(hns3_pmu->base + HNS3_PMU_REG_GLOBAL_CTRL);
> + val &= ~HNS3_PMU_GLOBAL_START;
> + writel(val, hns3_pmu->base + HNS3_PMU_REG_GLOBAL_CTRL);
> +}
> +
> +static int hns3_pmu_alloc(struct pci_dev *pdev, struct hns3_pmu *hns3_pmu)
> +{
> + u16 device_id;
> + char *name;
> + u32 val;
> +
> + hns3_pmu->base = pci_ioremap_bar(pdev, BAR_ID);
> + if (!hns3_pmu->base) {
> + pci_err(pdev, "ioremap failed for hns3_pmu resource\n");
> + pci_release_regions(pdev);
> + return -ENOMEM;
> + }
> +
> + hns3_pmu->hw_clk = readl(hns3_pmu->base + HNS3_PMU_REG_CLOCK_FREQ);
> +
> + val = readl(hns3_pmu->base + HNS3_PMU_REG_BDF);
> + hns3_pmu->bdf_min = val & 0xffff;
> + hns3_pmu->bdf_max = val >> 16;
> +
> + val = readl(hns3_pmu->base + HNS3_PMU_REG_DEVICE_ID);
> + device_id = val & 0xffff;
> + name = devm_kasprintf(&pdev->dev, GFP_KERNEL, "hns3_pmu_%u", device_id);
you don't check the return value
> +
> + hns3_pmu->pdev = pdev;
> + hns3_pmu->domain_id = pdev->bus->domain_nr;
> + hns3_pmu->on_cpu = HNS3_PMU_INVALID_CPU_ID;
> + hns3_pmu->identifier = readl(hns3_pmu->base + HNS3_PMU_REG_VERSION);
> + hns3_pmu->pmu = (struct pmu) {
> + .name = name,
> + .module = THIS_MODULE,
> + .event_init = hns3_pmu_event_init,
> + .pmu_enable = hns3_pmu_enable,
> + .pmu_disable = hns3_pmu_disable,
> + .add = hns3_pmu_add,
> + .del = hns3_pmu_del,
> + .start = hns3_pmu_start,
> + .stop = hns3_pmu_stop,
> + .read = hns3_pmu_read,
> + .task_ctx_nr = perf_invalid_context,
> + .attr_groups = hns3_pmu_attr_groups,
> + .capabilities = PERF_PMU_CAP_NO_EXCLUDE,
> + };
> +
> + return 0;
> +}
> +
> +static irqreturn_t hns3_pmu_irq(int irq, void *data)
> +{
> + struct hns3_pmu *hns3_pmu = data;
> + u32 intr_status, idx;
> +
> + for (idx = 0; idx < HNS3_PMU_MAX_COUNTERS; idx++) {
> + intr_status = hns3_pmu_readl(hns3_pmu,
> + HNS3_PMU_REG_EVENT_INTR_STATUS,
> + idx);
> +
> + /*
> + * As each counter will restart from 0 when it is overflowed,
> + * extra processing is no need, just clear interrupt status.
> + */
> + if (intr_status)
> + hns3_pmu_clear_intr_status(hns3_pmu, idx);
> + }
> +
> + return IRQ_HANDLED;
> +}
> +
> +static int hns3_pmu_associate_cpu(struct hns3_pmu *hns3_pmu, unsigned int cpu)
> +{
> + struct device *dev = &hns3_pmu->pdev->dev;
> + const struct cpumask *mask;
> +
> + /*
> + * Check whether this CPU is associated with this HNS3 PMU
> + * according to the NUMA node.
> + */
> + mask = (dev_to_node(dev) == NUMA_NO_NODE) ? cpu_online_mask :
> + cpumask_of_node(dev_to_node(dev));
> +
> + return cpumask_test_cpu(cpu, mask);
> +}
> +
> +static int hns3_pmu_online_cpu(unsigned int cpu, struct hlist_node *node)
> +{
I think someone may be factoring this out of all the hisi PMUs..
And here I really don't know why we do this with online/offline mechanism.
Can't we do for_each_possible_cpu()?
We do offline/online for hisi_uncore_pmu() as we need finer grain detail
if cluster/super cluster.
> + struct hns3_pmu *hns3_pmu;
> +
> + hns3_pmu = hlist_entry_safe(node, struct hns3_pmu, node);
> + if (!hns3_pmu)
> + return -ENODEV;
> +
> + if (!hns3_pmu_associate_cpu(hns3_pmu, cpu))
> + return 0;
> +
> + cpumask_set_cpu(cpu, &hns3_pmu->associated_cpus);
> + if (hns3_pmu->on_cpu != HNS3_PMU_INVALID_CPU_ID)
> + return 0;
> +
> + /* Use this CPU in cpumask for event counting */
> + hns3_pmu->on_cpu = cpu;
> +
> + /* Overflow interrupt also should use the same CPU */
> + irq_set_affinity_hint(hns3_pmu->irq, cpumask_of(cpu));
> +
> + return 0;
> +}
> +
> +static int hns3_pmu_offline_cpu(unsigned int cpu, struct hlist_node *node)
> +{
> + struct hns3_pmu *hns3_pmu;
> + cpumask_t pmu_online_cpus;
> + unsigned int target;
> +
> + hns3_pmu = hlist_entry_safe(node, struct hns3_pmu, node);
> + if (!hns3_pmu)
> + return -ENODEV;
> +
> + if (!cpumask_test_and_clear_cpu(cpu, &hns3_pmu->associated_cpus))
> + return 0;
> +
> + if (hns3_pmu->on_cpu != cpu)
> + return 0;
> +
> + /* Give up ownership of the PMU */
> + hns3_pmu->on_cpu = HNS3_PMU_INVALID_CPU_ID;
> +
> + /* Choose a new CPU to migrate ownership of the PMU */
> + cpumask_and(&pmu_online_cpus, &hns3_pmu->associated_cpus,
> + cpu_online_mask);
> + target = cpumask_any_but(&pmu_online_cpus, cpu);
> + if (target >= nr_cpu_ids)
> + return 0;
> +
> + hns3_pmu->on_cpu = target;
> + perf_pmu_migrate_context(&hns3_pmu->pmu, cpu, target);
> + irq_set_affinity_hint(hns3_pmu->irq, cpumask_of(target));
> +
> + return 0;
> +}
> +
> +static int hns3_pmu_irq_register(struct pci_dev *pdev,
> + struct hns3_pmu *hns3_pmu)
> +{
> + int irq, ret;
> +
> + ret = pci_alloc_irq_vectors(pdev, HNS3_IRQ_VECS, HNS3_IRQ_VECS,
just use 1 directly here
> + PCI_IRQ_MSI);
> + if (ret < 0) {
> + pci_err(pdev, "failed to enable MSI vectors, ret = %d.\n", ret);
> + return ret;
> + }
> +
> + irq = pci_irq_vector(pdev, HNS3_IRQ_VECTOR);
> + ret = request_irq(irq, hns3_pmu_irq, IRQF_SHARED,
> + hns3_pmu->pmu.name, hns3_pmu);
don't we have managed versions of all these now?
> + if (ret) {
> + pci_err(pdev, "failed to register irq, ret = %d.\n", ret);
> + pci_free_irq_vectors(pdev);
> + return ret;
> + }
> +
> + hns3_pmu->irq = irq;
> +
> + return 0;
> +}
> +
> +static int hns3_pmu_init(struct pci_dev *pdev, struct hns3_pmu *hns3_pmu)
> +{
> + int ret;
> +
> + ret = hns3_pmu_alloc(pdev, hns3_pmu);
> + if (ret)
> + return ret;
> +
> + ret = hns3_pmu_irq_register(pdev, hns3_pmu);
> + if (ret)
> + goto err_set_pmu_fail;
> +
> + ret = cpuhp_state_add_instance(CPUHP_AP_PERF_ARM_HNS3_PMU_ONLINE,
> + &hns3_pmu->node);
> + if (ret) {
> + pci_err(pdev, "failed to register hotplug, ret = %d.\n", ret);
> + goto err_irq_unregister;
> + }
> +
> + ret = perf_pmu_register(&hns3_pmu->pmu, hns3_pmu->pmu.name,
> + HNS3_PMU_INVALID_CPU_ID);
> + if (ret) {
> + pci_err(pdev, "failed to register HNS3 PMU, ret = %d.\n", ret);
> + goto err_hotplug_unregister;
> + }
> +
> + return ret;
> +
> +err_hotplug_unregister:
> + cpuhp_state_remove_instance(CPUHP_AP_PERF_ARM_HNS3_PMU_ONLINE,
> + &hns3_pmu->node);
> +
> +err_irq_unregister:
> + irq_set_affinity_hint(hns3_pmu->irq, NULL);
> + free_irq(hns3_pmu->irq, hns3_pmu);
> +
> +err_set_pmu_fail:
> + iounmap(hns3_pmu->base);
> +
> + return ret;
> +}
> +
> +static void hns3_pmu_uninit(struct pci_dev *pdev, struct hns3_pmu *hns3_pmu)
> +{
> + perf_pmu_unregister(&hns3_pmu->pmu);
> + irq_set_affinity_hint(hns3_pmu->irq, NULL);
> + free_irq(hns3_pmu->irq, hns3_pmu);
> + pci_free_irq_vectors(pdev);
> + cpuhp_state_remove_instance(CPUHP_AP_PERF_ARM_HNS3_PMU_ONLINE,
> + &hns3_pmu->node);
> + iounmap(hns3_pmu->base);
> +}
> +
> +static int hns3_pmu_init_dev(struct pci_dev *pdev)
> +{
> + int ret;
> +
> + ret = pci_enable_device(pdev);
> + if (ret) {
> + pci_err(pdev, "failed to enable pci device, ret = %d.\n", ret);
> + return ret;
> + }
> +
> + ret = pci_request_mem_regions(pdev, "hns3_pmu");
> + if (ret < 0) {
> + pci_err(pdev, "failed to request pci mem regions, ret = %d.\n",
> + ret);
> + pci_disable_device(pdev);
> + return ret;
> + }
> +
> + pci_set_master(pdev);
> +
> + return 0;
> +}
> +
> +static void hns3_pmu_uninit_dev(struct pci_dev *pdev)
> +{
> + pci_clear_master(pdev);
> + pci_release_mem_regions(pdev);
> + pci_disable_device(pdev);
> +}
> +
> +static int hns3_pmu_probe(struct pci_dev *pdev, const struct pci_device_id *id)
> +{
> + struct hns3_pmu *hns3_pmu;
> + int ret;
> +
> + hns3_pmu = devm_kzalloc(&pdev->dev, sizeof(*hns3_pmu), GFP_KERNEL);
> + if (!hns3_pmu)
> + return -ENOMEM;
> +
> + ret = hns3_pmu_init_dev(pdev);
> + if (ret)
> + return ret;
> +
> + ret = hns3_pmu_init(pdev, hns3_pmu);
> + if (ret) {
> + hns3_pmu_uninit_dev(pdev);
> + return ret;
> + }
> +
> + pci_set_drvdata(pdev, hns3_pmu);
> +
> + return ret;
> +}
> +
> +static void hns3_pmu_remove(struct pci_dev *pdev)
> +{
> + hns3_pmu_uninit(pdev, pci_get_drvdata(pdev));
> + hns3_pmu_uninit_dev(pdev);
> + pci_set_drvdata(pdev, NULL);
> +}
> +
> +static const struct pci_device_id hns3_pmu_ids[] = {
> + { PCI_DEVICE(PCI_VENDOR_ID_HUAWEI, HNS3_PMU_DEVICE_ID) },
> + { 0, }
> +};
> +MODULE_DEVICE_TABLE(pci, hns3_pmu_ids);
> +
> +static struct pci_driver hns3_pmu_driver = {
> + .name = "hns3_pmu",
> + .id_table = hns3_pmu_ids,
> + .probe = hns3_pmu_probe,
> + .remove = hns3_pmu_remove,
> +};
> +
> +static int __init hns3_pmu_module_init(void)
> +{
> + int ret;
> +
> + ret = hns3_pmu_init_filter_mode_group();
> + if (ret)
> + return ret;
> +
> + ret = cpuhp_setup_state_multi(CPUHP_AP_PERF_ARM_HNS3_PMU_ONLINE,
> + "AP_PERF_ARM_HNS3_PMU_ONLINE",
> + hns3_pmu_online_cpu,
> + hns3_pmu_offline_cpu);
> + if (ret) {
> + pr_err("failed to setup HNS3 PMU hotplug, ret = %d.\n", ret);
> + goto err_init;
> + }
> +
> + ret = pci_register_driver(&hns3_pmu_driver);
> + if (ret) {
> + pr_err("failed to register pci driver, ret = %d.\n", ret);
> + goto err_hp;
> + }
> +
> + return 0;
> +
> +err_hp:
> + cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_HNS3_PMU_ONLINE);
> +err_init:
> + hns3_pmu_uinit_filter_mode_group();
> + return ret;
> +}
> +module_init(hns3_pmu_module_init);
> +
> +static void __exit hns3_pmu_module_exit(void)
> +{
> + pci_unregister_driver(&hns3_pmu_driver);
> + cpuhp_remove_multi_state(CPUHP_AP_PERF_ARM_HNS3_PMU_ONLINE);
> + hns3_pmu_uinit_filter_mode_group();
> +}
> +module_exit(hns3_pmu_module_exit);
> +
> +MODULE_DESCRIPTION("HNS3 PMU driver");
> +MODULE_LICENSE("GPL v2");
> diff --git a/include/linux/cpuhotplug.h b/include/linux/cpuhotplug.h
> index 113f51f..50c50e6 100644
> --- a/include/linux/cpuhotplug.h
> +++ b/include/linux/cpuhotplug.h
> @@ -174,6 +174,7 @@ enum cpuhp_state {
> CPUHP_AP_PERF_ARM_HISI_DDRC_ONLINE,
> CPUHP_AP_PERF_ARM_HISI_HHA_ONLINE,
> CPUHP_AP_PERF_ARM_HISI_L3_ONLINE,
> + CPUHP_AP_PERF_ARM_HNS3_PMU_ONLINE,
> CPUHP_AP_PERF_ARM_L2X0_ONLINE,
> CPUHP_AP_PERF_ARM_QCOM_L2_ONLINE,
> CPUHP_AP_PERF_ARM_QCOM_L3_ONLINE,
>
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