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/* SPDX-License-Identifier: GPL-2.0 */
/*
* Driver for HiSilicon PCIe tune and trace device
*
* Copyright (c) 2022 HiSilicon Technologies Co., Ltd.
* Author: Yicong Yang <yangyicong@hisilicon.com>
*/
#ifndef _HISI_PTT_H
#define _HISI_PTT_H
#include <linux/bits.h>
#include <linux/cpumask.h>
#include <linux/device.h>
#include <linux/kfifo.h>
#include <linux/list.h>
#include <linux/mutex.h>
#include <linux/notifier.h>
#include <linux/pci.h>
#include <linux/perf_event.h>
#include <linux/spinlock.h>
#include <linux/types.h>
#include <linux/workqueue.h>
#define DRV_NAME "hisi_ptt"
/*
* The definition of the device registers and register fields.
*/
#define HISI_PTT_TUNING_CTRL 0x0000
#define HISI_PTT_TUNING_CTRL_CODE GENMASK(15, 0)
#define HISI_PTT_TUNING_CTRL_SUB GENMASK(23, 16)
#define HISI_PTT_TUNING_DATA 0x0004
#define HISI_PTT_TUNING_DATA_VAL_MASK GENMASK(15, 0)
#define HISI_PTT_TRACE_ADDR_SIZE 0x0800
#define HISI_PTT_TRACE_ADDR_BASE_LO_0 0x0810
#define HISI_PTT_TRACE_ADDR_BASE_HI_0 0x0814
#define HISI_PTT_TRACE_ADDR_STRIDE 0x8
#define HISI_PTT_TRACE_CTRL 0x0850
#define HISI_PTT_TRACE_CTRL_EN BIT(0)
#define HISI_PTT_TRACE_CTRL_RST BIT(1)
#define HISI_PTT_TRACE_CTRL_RXTX_SEL GENMASK(3, 2)
#define HISI_PTT_TRACE_CTRL_TYPE_SEL GENMASK(7, 4)
#define HISI_PTT_TRACE_CTRL_DATA_FORMAT BIT(14)
#define HISI_PTT_TRACE_CTRL_FILTER_MODE BIT(15)
#define HISI_PTT_TRACE_CTRL_TARGET_SEL GENMASK(31, 16)
#define HISI_PTT_TRACE_INT_STAT 0x0890
#define HISI_PTT_TRACE_INT_STAT_MASK GENMASK(3, 0)
#define HISI_PTT_TRACE_INT_MASK 0x0894
#define HISI_PTT_TUNING_INT_STAT 0x0898
#define HISI_PTT_TUNING_INT_STAT_MASK BIT(0)
#define HISI_PTT_TRACE_WR_STS 0x08a0
#define HISI_PTT_TRACE_WR_STS_WRITE GENMASK(27, 0)
#define HISI_PTT_TRACE_WR_STS_BUFFER GENMASK(29, 28)
#define HISI_PTT_TRACE_STS 0x08b0
#define HISI_PTT_TRACE_IDLE BIT(0)
#define HISI_PTT_DEVICE_RANGE 0x0fe0
#define HISI_PTT_DEVICE_RANGE_UPPER GENMASK(31, 16)
#define HISI_PTT_DEVICE_RANGE_LOWER GENMASK(15, 0)
#define HISI_PTT_LOCATION 0x0fe8
#define HISI_PTT_CORE_ID GENMASK(15, 0)
#define HISI_PTT_SICL_ID GENMASK(31, 16)
/* Parameters of PTT trace DMA part. */
#define HISI_PTT_TRACE_DMA_IRQ 0
#define HISI_PTT_TRACE_BUF_CNT 4
#define HISI_PTT_TRACE_BUF_SIZE SZ_4M
#define HISI_PTT_TRACE_TOTAL_BUF_SIZE (HISI_PTT_TRACE_BUF_SIZE * \
HISI_PTT_TRACE_BUF_CNT)
/* Wait time for hardware DMA to reset */
#define HISI_PTT_RESET_TIMEOUT_US 10UL
#define HISI_PTT_RESET_POLL_INTERVAL_US 1UL
/* Poll timeout and interval for waiting hardware work to finish */
#define HISI_PTT_WAIT_TUNE_TIMEOUT_US 1000000UL
#define HISI_PTT_WAIT_TRACE_TIMEOUT_US 100UL
#define HISI_PTT_WAIT_POLL_INTERVAL_US 10UL
/* FIFO size for dynamically updating the PTT trace filter list. */
#define HISI_PTT_FILTER_UPDATE_FIFO_SIZE 16
/* Delay time for filter updating work */
#define HISI_PTT_WORK_DELAY_MS 100UL
#define HISI_PCIE_CORE_PORT_ID(devfn) ((PCI_SLOT(devfn) & 0x7) << 1)
/* Definition of the PMU configs */
#define HISI_PTT_PMU_FILTER_IS_PORT BIT(19)
#define HISI_PTT_PMU_FILTER_VAL_MASK GENMASK(15, 0)
#define HISI_PTT_PMU_DIRECTION_MASK GENMASK(23, 20)
#define HISI_PTT_PMU_TYPE_MASK GENMASK(31, 24)
#define HISI_PTT_PMU_FORMAT_MASK GENMASK(35, 32)
/**
* struct hisi_ptt_tune_desc - Describe tune event for PTT tune
* @hisi_ptt: PTT device this tune event belongs to
* @name: name of this event
* @event_code: code of the event
*/
struct hisi_ptt_tune_desc {
struct hisi_ptt *hisi_ptt;
const char *name;
u32 event_code;
};
/**
* struct hisi_ptt_dma_buffer - Describe a single trace buffer of PTT trace.
* The detail of the data format is described
* in the documentation of PTT device.
* @dma: DMA address of this buffer visible to the device
* @addr: virtual address of this buffer visible to the cpu
*/
struct hisi_ptt_dma_buffer {
dma_addr_t dma;
void *addr;
};
/**
* struct hisi_ptt_trace_ctrl - Control and status of PTT trace
* @trace_buf: array of the trace buffers for holding the trace data.
* the length will be HISI_PTT_TRACE_BUF_CNT.
* @handle: perf output handle of current trace session
* @buf_index: the index of current using trace buffer
* @on_cpu: current tracing cpu
* @started: current trace status, true for started
* @is_port: whether we're tracing root port or not
* @direction: direction of the TLP headers to trace
* @filter: filter value for tracing the TLP headers
* @format: format of the TLP headers to trace
* @type: type of the TLP headers to trace
*/
struct hisi_ptt_trace_ctrl {
struct hisi_ptt_dma_buffer *trace_buf;
struct perf_output_handle handle;
u32 buf_index;
int on_cpu;
bool started;
bool is_port;
u32 direction:2;
u32 filter:16;
u32 format:1;
u32 type:4;
};
/*
* sysfs attribute group name for root port filters and requester filters:
* /sys/devices/hisi_ptt<sicl_id>_<core_id>/root_port_filters
* and
* /sys/devices/hisi_ptt<sicl_id>_<core_id>/requester_filters
*/
#define HISI_PTT_RP_FILTERS_GRP_NAME "root_port_filters"
#define HISI_PTT_REQ_FILTERS_GRP_NAME "requester_filters"
/**
* struct hisi_ptt_filter_desc - Descriptor of the PTT trace filter
* @attr: sysfs attribute of this filter
* @list: entry of this descriptor in the filter list
* @is_port: the PCI device of the filter is a Root Port or not
* @name: name of this filter, same as the name of the related PCI device
* @devid: the PCI device's devid of the filter
*/
struct hisi_ptt_filter_desc {
struct device_attribute attr;
struct list_head list;
bool is_port;
char *name;
u16 devid;
};
/**
* struct hisi_ptt_filter_update_info - Information for PTT filter updating
* @is_port: the PCI device to update is a Root Port or not
* @is_add: adding to the filter or not
* @devid: the PCI device's devid of the filter
*/
struct hisi_ptt_filter_update_info {
bool is_port;
bool is_add;
u16 devid;
};
/**
* struct hisi_ptt_pmu_buf - Descriptor of the AUX buffer of PTT trace
* @length: size of the AUX buffer
* @nr_pages: number of pages of the AUX buffer
* @base: start address of AUX buffer
* @pos: position in the AUX buffer to commit traced data
*/
struct hisi_ptt_pmu_buf {
size_t length;
int nr_pages;
void *base;
long pos;
};
/**
* struct hisi_ptt - Per PTT device data
* @trace_ctrl: the control information of PTT trace
* @hisi_ptt_nb: dynamic filter update notifier
* @hotplug_node: node for register cpu hotplug event
* @hisi_ptt_pmu: the pum device of trace
* @iobase: base IO address of the device
* @pdev: pci_dev of this PTT device
* @tune_lock: lock to serialize the tune process
* @pmu_lock: lock to serialize the perf process
* @trace_irq: interrupt number used by trace
* @upper_bdf: the upper BDF range of the PCI devices managed by this PTT device
* @lower_bdf: the lower BDF range of the PCI devices managed by this PTT device
* @port_filters: the filter list of root ports
* @req_filters: the filter list of requester ID
* @filter_lock: lock to protect the filters
* @sysfs_inited: whether the filters' sysfs entries has been initialized
* @port_mask: port mask of the managed root ports
* @work: delayed work for filter updating
* @filter_update_lock: spinlock to protect the filter update fifo
* @filter_update_fifo: fifo of the filters waiting to update the filter list
*/
struct hisi_ptt {
struct hisi_ptt_trace_ctrl trace_ctrl;
struct notifier_block hisi_ptt_nb;
struct hlist_node hotplug_node;
struct pmu hisi_ptt_pmu;
void __iomem *iobase;
struct pci_dev *pdev;
struct mutex tune_lock;
spinlock_t pmu_lock;
int trace_irq;
u32 upper_bdf;
u32 lower_bdf;
/*
* The trace TLP headers can either be filtered by certain
* root port, or by the requester ID. Organize the filters
* by @port_filters and @req_filters here. The mask of all
* the valid ports is also cached for doing sanity check
* of user input.
*/
struct list_head port_filters;
struct list_head req_filters;
struct mutex filter_lock;
bool sysfs_inited;
u16 port_mask;
/*
* We use a delayed work here to avoid indefinitely waiting for
* the hisi_ptt->mutex which protecting the filter list. The
* work will be delayed only if the mutex can not be held,
* otherwise no delay will be applied.
*/
struct delayed_work work;
spinlock_t filter_update_lock;
DECLARE_KFIFO(filter_update_kfifo, struct hisi_ptt_filter_update_info,
HISI_PTT_FILTER_UPDATE_FIFO_SIZE);
};
#define to_hisi_ptt(pmu) container_of(pmu, struct hisi_ptt, hisi_ptt_pmu)
#endif /* _HISI_PTT_H */
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