diff options
Diffstat (limited to 'drivers/perf/dwc_pcie_pmu.c')
| -rw-r--r-- | drivers/perf/dwc_pcie_pmu.c | 792 |
1 files changed, 792 insertions, 0 deletions
diff --git a/drivers/perf/dwc_pcie_pmu.c b/drivers/perf/dwc_pcie_pmu.c new file mode 100644 index 0000000000..957058ad00 --- /dev/null +++ b/drivers/perf/dwc_pcie_pmu.c @@ -0,0 +1,792 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Synopsys DesignWare PCIe PMU driver + * + * Copyright (C) 2021-2023 Alibaba Inc. + */ + +#include <linux/bitfield.h> +#include <linux/bitops.h> +#include <linux/cpuhotplug.h> +#include <linux/cpumask.h> +#include <linux/device.h> +#include <linux/errno.h> +#include <linux/kernel.h> +#include <linux/list.h> +#include <linux/perf_event.h> +#include <linux/pci.h> +#include <linux/platform_device.h> +#include <linux/smp.h> +#include <linux/sysfs.h> +#include <linux/types.h> + +#define DWC_PCIE_VSEC_RAS_DES_ID 0x02 +#define DWC_PCIE_EVENT_CNT_CTL 0x8 + +/* + * Event Counter Data Select includes two parts: + * - 27-24: Group number(4-bit: 0..0x7) + * - 23-16: Event number(8-bit: 0..0x13) within the Group + * + * Put them together as in TRM. + */ +#define DWC_PCIE_CNT_EVENT_SEL GENMASK(27, 16) +#define DWC_PCIE_CNT_LANE_SEL GENMASK(11, 8) +#define DWC_PCIE_CNT_STATUS BIT(7) +#define DWC_PCIE_CNT_ENABLE GENMASK(4, 2) +#define DWC_PCIE_PER_EVENT_OFF 0x1 +#define DWC_PCIE_PER_EVENT_ON 0x3 +#define DWC_PCIE_EVENT_CLEAR GENMASK(1, 0) +#define DWC_PCIE_EVENT_PER_CLEAR 0x1 + +#define DWC_PCIE_EVENT_CNT_DATA 0xC + +#define DWC_PCIE_TIME_BASED_ANAL_CTL 0x10 +#define DWC_PCIE_TIME_BASED_REPORT_SEL GENMASK(31, 24) +#define DWC_PCIE_TIME_BASED_DURATION_SEL GENMASK(15, 8) +#define DWC_PCIE_DURATION_MANUAL_CTL 0x0 +#define DWC_PCIE_DURATION_1MS 0x1 +#define DWC_PCIE_DURATION_10MS 0x2 +#define DWC_PCIE_DURATION_100MS 0x3 +#define DWC_PCIE_DURATION_1S 0x4 +#define DWC_PCIE_DURATION_2S 0x5 +#define DWC_PCIE_DURATION_4S 0x6 +#define DWC_PCIE_DURATION_4US 0xFF +#define DWC_PCIE_TIME_BASED_TIMER_START BIT(0) +#define DWC_PCIE_TIME_BASED_CNT_ENABLE 0x1 + +#define DWC_PCIE_TIME_BASED_ANAL_DATA_REG_LOW 0x14 +#define DWC_PCIE_TIME_BASED_ANAL_DATA_REG_HIGH 0x18 + +/* Event attributes */ +#define DWC_PCIE_CONFIG_EVENTID GENMASK(15, 0) +#define DWC_PCIE_CONFIG_TYPE GENMASK(19, 16) +#define DWC_PCIE_CONFIG_LANE GENMASK(27, 20) + +#define DWC_PCIE_EVENT_ID(event) FIELD_GET(DWC_PCIE_CONFIG_EVENTID, (event)->attr.config) +#define DWC_PCIE_EVENT_TYPE(event) FIELD_GET(DWC_PCIE_CONFIG_TYPE, (event)->attr.config) +#define DWC_PCIE_EVENT_LANE(event) FIELD_GET(DWC_PCIE_CONFIG_LANE, (event)->attr.config) + +enum dwc_pcie_event_type { + DWC_PCIE_TIME_BASE_EVENT, + DWC_PCIE_LANE_EVENT, + DWC_PCIE_EVENT_TYPE_MAX, +}; + +#define DWC_PCIE_LANE_EVENT_MAX_PERIOD GENMASK_ULL(31, 0) +#define DWC_PCIE_MAX_PERIOD GENMASK_ULL(63, 0) + +struct dwc_pcie_pmu { + struct pmu pmu; + struct pci_dev *pdev; /* Root Port device */ + u16 ras_des_offset; + u32 nr_lanes; + + struct list_head pmu_node; + struct hlist_node cpuhp_node; + struct perf_event *event[DWC_PCIE_EVENT_TYPE_MAX]; + int on_cpu; +}; + +#define to_dwc_pcie_pmu(p) (container_of(p, struct dwc_pcie_pmu, pmu)) + +static int dwc_pcie_pmu_hp_state; +static struct list_head dwc_pcie_dev_info_head = + LIST_HEAD_INIT(dwc_pcie_dev_info_head); +static bool notify; + +struct dwc_pcie_dev_info { + struct platform_device *plat_dev; + struct pci_dev *pdev; + struct list_head dev_node; +}; + +struct dwc_pcie_vendor_id { + int vendor_id; +}; + +static const struct dwc_pcie_vendor_id dwc_pcie_vendor_ids[] = { + {.vendor_id = PCI_VENDOR_ID_ALIBABA }, + {} /* terminator */ +}; + +static ssize_t cpumask_show(struct device *dev, + struct device_attribute *attr, + char *buf) +{ + struct dwc_pcie_pmu *pcie_pmu = to_dwc_pcie_pmu(dev_get_drvdata(dev)); + + return cpumap_print_to_pagebuf(true, buf, cpumask_of(pcie_pmu->on_cpu)); +} +static DEVICE_ATTR_RO(cpumask); + +static struct attribute *dwc_pcie_pmu_cpumask_attrs[] = { + &dev_attr_cpumask.attr, + NULL +}; + +static struct attribute_group dwc_pcie_cpumask_attr_group = { + .attrs = dwc_pcie_pmu_cpumask_attrs, +}; + +struct dwc_pcie_format_attr { + struct device_attribute attr; + u64 field; + int config; +}; + +PMU_FORMAT_ATTR(eventid, "config:0-15"); +PMU_FORMAT_ATTR(type, "config:16-19"); +PMU_FORMAT_ATTR(lane, "config:20-27"); + +static struct attribute *dwc_pcie_format_attrs[] = { + &format_attr_type.attr, + &format_attr_eventid.attr, + &format_attr_lane.attr, + NULL, +}; + +static struct attribute_group dwc_pcie_format_attrs_group = { + .name = "format", + .attrs = dwc_pcie_format_attrs, +}; + +struct dwc_pcie_event_attr { + struct device_attribute attr; + enum dwc_pcie_event_type type; + u16 eventid; + u8 lane; +}; + +static ssize_t dwc_pcie_event_show(struct device *dev, + struct device_attribute *attr, char *buf) +{ + struct dwc_pcie_event_attr *eattr; + + eattr = container_of(attr, typeof(*eattr), attr); + + if (eattr->type == DWC_PCIE_LANE_EVENT) + return sysfs_emit(buf, "eventid=0x%x,type=0x%x,lane=?\n", + eattr->eventid, eattr->type); + else if (eattr->type == DWC_PCIE_TIME_BASE_EVENT) + return sysfs_emit(buf, "eventid=0x%x,type=0x%x\n", + eattr->eventid, eattr->type); + + return 0; +} + +#define DWC_PCIE_EVENT_ATTR(_name, _type, _eventid, _lane) \ + (&((struct dwc_pcie_event_attr[]) {{ \ + .attr = __ATTR(_name, 0444, dwc_pcie_event_show, NULL), \ + .type = _type, \ + .eventid = _eventid, \ + .lane = _lane, \ + }})[0].attr.attr) + +#define DWC_PCIE_PMU_TIME_BASE_EVENT_ATTR(_name, _eventid) \ + DWC_PCIE_EVENT_ATTR(_name, DWC_PCIE_TIME_BASE_EVENT, _eventid, 0) +#define DWC_PCIE_PMU_LANE_EVENT_ATTR(_name, _eventid) \ + DWC_PCIE_EVENT_ATTR(_name, DWC_PCIE_LANE_EVENT, _eventid, 0) + +static struct attribute *dwc_pcie_pmu_time_event_attrs[] = { + /* Group #0 */ + DWC_PCIE_PMU_TIME_BASE_EVENT_ATTR(one_cycle, 0x00), + DWC_PCIE_PMU_TIME_BASE_EVENT_ATTR(TX_L0S, 0x01), + DWC_PCIE_PMU_TIME_BASE_EVENT_ATTR(RX_L0S, 0x02), + DWC_PCIE_PMU_TIME_BASE_EVENT_ATTR(L0, 0x03), + DWC_PCIE_PMU_TIME_BASE_EVENT_ATTR(L1, 0x04), + DWC_PCIE_PMU_TIME_BASE_EVENT_ATTR(L1_1, 0x05), + DWC_PCIE_PMU_TIME_BASE_EVENT_ATTR(L1_2, 0x06), + DWC_PCIE_PMU_TIME_BASE_EVENT_ATTR(CFG_RCVRY, 0x07), + DWC_PCIE_PMU_TIME_BASE_EVENT_ATTR(TX_RX_L0S, 0x08), + DWC_PCIE_PMU_TIME_BASE_EVENT_ATTR(L1_AUX, 0x09), + + /* Group #1 */ + DWC_PCIE_PMU_TIME_BASE_EVENT_ATTR(Tx_PCIe_TLP_Data_Payload, 0x20), + DWC_PCIE_PMU_TIME_BASE_EVENT_ATTR(Rx_PCIe_TLP_Data_Payload, 0x21), + DWC_PCIE_PMU_TIME_BASE_EVENT_ATTR(Tx_CCIX_TLP_Data_Payload, 0x22), + DWC_PCIE_PMU_TIME_BASE_EVENT_ATTR(Rx_CCIX_TLP_Data_Payload, 0x23), + + /* + * Leave it to the user to specify the lane ID to avoid generating + * a list of hundreds of events. + */ + DWC_PCIE_PMU_LANE_EVENT_ATTR(tx_ack_dllp, 0x600), + DWC_PCIE_PMU_LANE_EVENT_ATTR(tx_update_fc_dllp, 0x601), + DWC_PCIE_PMU_LANE_EVENT_ATTR(rx_ack_dllp, 0x602), + DWC_PCIE_PMU_LANE_EVENT_ATTR(rx_update_fc_dllp, 0x603), + DWC_PCIE_PMU_LANE_EVENT_ATTR(rx_nulified_tlp, 0x604), + DWC_PCIE_PMU_LANE_EVENT_ATTR(tx_nulified_tlp, 0x605), + DWC_PCIE_PMU_LANE_EVENT_ATTR(rx_duplicate_tl, 0x606), + DWC_PCIE_PMU_LANE_EVENT_ATTR(tx_memory_write, 0x700), + DWC_PCIE_PMU_LANE_EVENT_ATTR(tx_memory_read, 0x701), + DWC_PCIE_PMU_LANE_EVENT_ATTR(tx_configuration_write, 0x702), + DWC_PCIE_PMU_LANE_EVENT_ATTR(tx_configuration_read, 0x703), + DWC_PCIE_PMU_LANE_EVENT_ATTR(tx_io_write, 0x704), + DWC_PCIE_PMU_LANE_EVENT_ATTR(tx_io_read, 0x705), + DWC_PCIE_PMU_LANE_EVENT_ATTR(tx_completion_without_data, 0x706), + DWC_PCIE_PMU_LANE_EVENT_ATTR(tx_completion_with_data, 0x707), + DWC_PCIE_PMU_LANE_EVENT_ATTR(tx_message_tlp, 0x708), + DWC_PCIE_PMU_LANE_EVENT_ATTR(tx_atomic, 0x709), + DWC_PCIE_PMU_LANE_EVENT_ATTR(tx_tlp_with_prefix, 0x70A), + DWC_PCIE_PMU_LANE_EVENT_ATTR(rx_memory_write, 0x70B), + DWC_PCIE_PMU_LANE_EVENT_ATTR(rx_memory_read, 0x70C), + DWC_PCIE_PMU_LANE_EVENT_ATTR(rx_io_write, 0x70F), + DWC_PCIE_PMU_LANE_EVENT_ATTR(rx_io_read, 0x710), + DWC_PCIE_PMU_LANE_EVENT_ATTR(rx_completion_without_data, 0x711), + DWC_PCIE_PMU_LANE_EVENT_ATTR(rx_completion_with_data, 0x712), + DWC_PCIE_PMU_LANE_EVENT_ATTR(rx_message_tlp, 0x713), + DWC_PCIE_PMU_LANE_EVENT_ATTR(rx_atomic, 0x714), + DWC_PCIE_PMU_LANE_EVENT_ATTR(rx_tlp_with_prefix, 0x715), + DWC_PCIE_PMU_LANE_EVENT_ATTR(tx_ccix_tlp, 0x716), + DWC_PCIE_PMU_LANE_EVENT_ATTR(rx_ccix_tlp, 0x717), + NULL +}; + +static const struct attribute_group dwc_pcie_event_attrs_group = { + .name = "events", + .attrs = dwc_pcie_pmu_time_event_attrs, +}; + +static const struct attribute_group *dwc_pcie_attr_groups[] = { + &dwc_pcie_event_attrs_group, + &dwc_pcie_format_attrs_group, + &dwc_pcie_cpumask_attr_group, + NULL +}; + +static void dwc_pcie_pmu_lane_event_enable(struct dwc_pcie_pmu *pcie_pmu, + bool enable) +{ + struct pci_dev *pdev = pcie_pmu->pdev; + u16 ras_des_offset = pcie_pmu->ras_des_offset; + + if (enable) + pci_clear_and_set_config_dword(pdev, + ras_des_offset + DWC_PCIE_EVENT_CNT_CTL, + DWC_PCIE_CNT_ENABLE, DWC_PCIE_PER_EVENT_ON); + else + pci_clear_and_set_config_dword(pdev, + ras_des_offset + DWC_PCIE_EVENT_CNT_CTL, + DWC_PCIE_CNT_ENABLE, DWC_PCIE_PER_EVENT_OFF); +} + +static void dwc_pcie_pmu_time_based_event_enable(struct dwc_pcie_pmu *pcie_pmu, + bool enable) +{ + struct pci_dev *pdev = pcie_pmu->pdev; + u16 ras_des_offset = pcie_pmu->ras_des_offset; + + pci_clear_and_set_config_dword(pdev, + ras_des_offset + DWC_PCIE_TIME_BASED_ANAL_CTL, + DWC_PCIE_TIME_BASED_TIMER_START, enable); +} + +static u64 dwc_pcie_pmu_read_lane_event_counter(struct perf_event *event) +{ + struct dwc_pcie_pmu *pcie_pmu = to_dwc_pcie_pmu(event->pmu); + struct pci_dev *pdev = pcie_pmu->pdev; + u16 ras_des_offset = pcie_pmu->ras_des_offset; + u32 val; + + pci_read_config_dword(pdev, ras_des_offset + DWC_PCIE_EVENT_CNT_DATA, &val); + + return val; +} + +static u64 dwc_pcie_pmu_read_time_based_counter(struct perf_event *event) +{ + struct dwc_pcie_pmu *pcie_pmu = to_dwc_pcie_pmu(event->pmu); + struct pci_dev *pdev = pcie_pmu->pdev; + int event_id = DWC_PCIE_EVENT_ID(event); + u16 ras_des_offset = pcie_pmu->ras_des_offset; + u32 lo, hi, ss; + u64 val; + + /* + * The 64-bit value of the data counter is spread across two + * registers that are not synchronized. In order to read them + * atomically, ensure that the high 32 bits match before and after + * reading the low 32 bits. + */ + pci_read_config_dword(pdev, + ras_des_offset + DWC_PCIE_TIME_BASED_ANAL_DATA_REG_HIGH, &hi); + do { + /* snapshot the high 32 bits */ + ss = hi; + + pci_read_config_dword( + pdev, ras_des_offset + DWC_PCIE_TIME_BASED_ANAL_DATA_REG_LOW, + &lo); + pci_read_config_dword( + pdev, ras_des_offset + DWC_PCIE_TIME_BASED_ANAL_DATA_REG_HIGH, + &hi); + } while (hi != ss); + + val = ((u64)hi << 32) | lo; + /* + * The Group#1 event measures the amount of data processed in 16-byte + * units. Simplify the end-user interface by multiplying the counter + * at the point of read. + */ + if (event_id >= 0x20 && event_id <= 0x23) + val *= 16; + + return val; +} + +static void dwc_pcie_pmu_event_update(struct perf_event *event) +{ + struct hw_perf_event *hwc = &event->hw; + enum dwc_pcie_event_type type = DWC_PCIE_EVENT_TYPE(event); + u64 delta, prev, now = 0; + + do { + prev = local64_read(&hwc->prev_count); + + if (type == DWC_PCIE_LANE_EVENT) + now = dwc_pcie_pmu_read_lane_event_counter(event); + else if (type == DWC_PCIE_TIME_BASE_EVENT) + now = dwc_pcie_pmu_read_time_based_counter(event); + + } while (local64_cmpxchg(&hwc->prev_count, prev, now) != prev); + + delta = (now - prev) & DWC_PCIE_MAX_PERIOD; + /* 32-bit counter for Lane Event Counting */ + if (type == DWC_PCIE_LANE_EVENT) + delta &= DWC_PCIE_LANE_EVENT_MAX_PERIOD; + + local64_add(delta, &event->count); +} + +static int dwc_pcie_pmu_event_init(struct perf_event *event) +{ + struct dwc_pcie_pmu *pcie_pmu = to_dwc_pcie_pmu(event->pmu); + enum dwc_pcie_event_type type = DWC_PCIE_EVENT_TYPE(event); + struct perf_event *sibling; + u32 lane; + + if (event->attr.type != event->pmu->type) + return -ENOENT; + + /* We don't support sampling */ + if (is_sampling_event(event)) + return -EINVAL; + + /* We cannot support task bound events */ + if (event->cpu < 0 || event->attach_state & PERF_ATTACH_TASK) + return -EINVAL; + + if (event->group_leader != event && + !is_software_event(event->group_leader)) + return -EINVAL; + + for_each_sibling_event(sibling, event->group_leader) { + if (sibling->pmu != event->pmu && !is_software_event(sibling)) + return -EINVAL; + } + + if (type < 0 || type >= DWC_PCIE_EVENT_TYPE_MAX) + return -EINVAL; + + if (type == DWC_PCIE_LANE_EVENT) { + lane = DWC_PCIE_EVENT_LANE(event); + if (lane < 0 || lane >= pcie_pmu->nr_lanes) + return -EINVAL; + } + + event->cpu = pcie_pmu->on_cpu; + + return 0; +} + +static void dwc_pcie_pmu_event_start(struct perf_event *event, int flags) +{ + struct hw_perf_event *hwc = &event->hw; + struct dwc_pcie_pmu *pcie_pmu = to_dwc_pcie_pmu(event->pmu); + enum dwc_pcie_event_type type = DWC_PCIE_EVENT_TYPE(event); + + hwc->state = 0; + local64_set(&hwc->prev_count, 0); + + if (type == DWC_PCIE_LANE_EVENT) + dwc_pcie_pmu_lane_event_enable(pcie_pmu, true); + else if (type == DWC_PCIE_TIME_BASE_EVENT) + dwc_pcie_pmu_time_based_event_enable(pcie_pmu, true); +} + +static void dwc_pcie_pmu_event_stop(struct perf_event *event, int flags) +{ + struct dwc_pcie_pmu *pcie_pmu = to_dwc_pcie_pmu(event->pmu); + enum dwc_pcie_event_type type = DWC_PCIE_EVENT_TYPE(event); + struct hw_perf_event *hwc = &event->hw; + + if (event->hw.state & PERF_HES_STOPPED) + return; + + if (type == DWC_PCIE_LANE_EVENT) + dwc_pcie_pmu_lane_event_enable(pcie_pmu, false); + else if (type == DWC_PCIE_TIME_BASE_EVENT) + dwc_pcie_pmu_time_based_event_enable(pcie_pmu, false); + + dwc_pcie_pmu_event_update(event); + hwc->state |= PERF_HES_STOPPED | PERF_HES_UPTODATE; +} + +static int dwc_pcie_pmu_event_add(struct perf_event *event, int flags) +{ + struct dwc_pcie_pmu *pcie_pmu = to_dwc_pcie_pmu(event->pmu); + struct pci_dev *pdev = pcie_pmu->pdev; + struct hw_perf_event *hwc = &event->hw; + enum dwc_pcie_event_type type = DWC_PCIE_EVENT_TYPE(event); + int event_id = DWC_PCIE_EVENT_ID(event); + int lane = DWC_PCIE_EVENT_LANE(event); + u16 ras_des_offset = pcie_pmu->ras_des_offset; + u32 ctrl; + + /* one counter for each type and it is in use */ + if (pcie_pmu->event[type]) + return -ENOSPC; + + pcie_pmu->event[type] = event; + hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE; + + if (type == DWC_PCIE_LANE_EVENT) { + /* EVENT_COUNTER_DATA_REG needs clear manually */ + ctrl = FIELD_PREP(DWC_PCIE_CNT_EVENT_SEL, event_id) | + FIELD_PREP(DWC_PCIE_CNT_LANE_SEL, lane) | + FIELD_PREP(DWC_PCIE_CNT_ENABLE, DWC_PCIE_PER_EVENT_OFF) | + FIELD_PREP(DWC_PCIE_EVENT_CLEAR, DWC_PCIE_EVENT_PER_CLEAR); + pci_write_config_dword(pdev, ras_des_offset + DWC_PCIE_EVENT_CNT_CTL, + ctrl); + } else if (type == DWC_PCIE_TIME_BASE_EVENT) { + /* + * TIME_BASED_ANAL_DATA_REG is a 64 bit register, we can safely + * use it with any manually controlled duration. And it is + * cleared when next measurement starts. + */ + ctrl = FIELD_PREP(DWC_PCIE_TIME_BASED_REPORT_SEL, event_id) | + FIELD_PREP(DWC_PCIE_TIME_BASED_DURATION_SEL, + DWC_PCIE_DURATION_MANUAL_CTL) | + DWC_PCIE_TIME_BASED_CNT_ENABLE; + pci_write_config_dword( + pdev, ras_des_offset + DWC_PCIE_TIME_BASED_ANAL_CTL, ctrl); + } + + if (flags & PERF_EF_START) + dwc_pcie_pmu_event_start(event, PERF_EF_RELOAD); + + perf_event_update_userpage(event); + + return 0; +} + +static void dwc_pcie_pmu_event_del(struct perf_event *event, int flags) +{ + struct dwc_pcie_pmu *pcie_pmu = to_dwc_pcie_pmu(event->pmu); + enum dwc_pcie_event_type type = DWC_PCIE_EVENT_TYPE(event); + + dwc_pcie_pmu_event_stop(event, flags | PERF_EF_UPDATE); + perf_event_update_userpage(event); + pcie_pmu->event[type] = NULL; +} + +static void dwc_pcie_pmu_remove_cpuhp_instance(void *hotplug_node) +{ + cpuhp_state_remove_instance_nocalls(dwc_pcie_pmu_hp_state, hotplug_node); +} + +/* + * Find the binded DES capability device info of a PCI device. + * @pdev: The PCI device. + */ +static struct dwc_pcie_dev_info *dwc_pcie_find_dev_info(struct pci_dev *pdev) +{ + struct dwc_pcie_dev_info *dev_info; + + list_for_each_entry(dev_info, &dwc_pcie_dev_info_head, dev_node) + if (dev_info->pdev == pdev) + return dev_info; + + return NULL; +} + +static void dwc_pcie_unregister_pmu(void *data) +{ + struct dwc_pcie_pmu *pcie_pmu = data; + + perf_pmu_unregister(&pcie_pmu->pmu); +} + +static bool dwc_pcie_match_des_cap(struct pci_dev *pdev) +{ + const struct dwc_pcie_vendor_id *vid; + u16 vsec = 0; + u32 val; + + if (!pci_is_pcie(pdev) || !(pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT)) + return false; + + for (vid = dwc_pcie_vendor_ids; vid->vendor_id; vid++) { + vsec = pci_find_vsec_capability(pdev, vid->vendor_id, + DWC_PCIE_VSEC_RAS_DES_ID); + if (vsec) + break; + } + if (!vsec) + return false; + + pci_read_config_dword(pdev, vsec + PCI_VNDR_HEADER, &val); + if (PCI_VNDR_HEADER_REV(val) != 0x04) + return false; + + pci_dbg(pdev, + "Detected PCIe Vendor-Specific Extended Capability RAS DES\n"); + return true; +} + +static void dwc_pcie_unregister_dev(struct dwc_pcie_dev_info *dev_info) +{ + platform_device_unregister(dev_info->plat_dev); + list_del(&dev_info->dev_node); + kfree(dev_info); +} + +static int dwc_pcie_register_dev(struct pci_dev *pdev) +{ + struct platform_device *plat_dev; + struct dwc_pcie_dev_info *dev_info; + u32 bdf; + + bdf = PCI_DEVID(pdev->bus->number, pdev->devfn); + plat_dev = platform_device_register_data(NULL, "dwc_pcie_pmu", bdf, + pdev, sizeof(*pdev)); + + if (IS_ERR(plat_dev)) + return PTR_ERR(plat_dev); + + dev_info = kzalloc(sizeof(*dev_info), GFP_KERNEL); + if (!dev_info) + return -ENOMEM; + + /* Cache platform device to handle pci device hotplug */ + dev_info->plat_dev = plat_dev; + dev_info->pdev = pdev; + list_add(&dev_info->dev_node, &dwc_pcie_dev_info_head); + + return 0; +} + +static int dwc_pcie_pmu_notifier(struct notifier_block *nb, + unsigned long action, void *data) +{ + struct device *dev = data; + struct pci_dev *pdev = to_pci_dev(dev); + struct dwc_pcie_dev_info *dev_info; + + switch (action) { + case BUS_NOTIFY_ADD_DEVICE: + if (!dwc_pcie_match_des_cap(pdev)) + return NOTIFY_DONE; + if (dwc_pcie_register_dev(pdev)) + return NOTIFY_BAD; + break; + case BUS_NOTIFY_DEL_DEVICE: + dev_info = dwc_pcie_find_dev_info(pdev); + if (!dev_info) + return NOTIFY_DONE; + dwc_pcie_unregister_dev(dev_info); + break; + } + + return NOTIFY_OK; +} + +static struct notifier_block dwc_pcie_pmu_nb = { + .notifier_call = dwc_pcie_pmu_notifier, +}; + +static int dwc_pcie_pmu_probe(struct platform_device *plat_dev) +{ + struct pci_dev *pdev = plat_dev->dev.platform_data; + struct dwc_pcie_pmu *pcie_pmu; + char *name; + u32 bdf, val; + u16 vsec; + int ret; + + vsec = pci_find_vsec_capability(pdev, pdev->vendor, + DWC_PCIE_VSEC_RAS_DES_ID); + pci_read_config_dword(pdev, vsec + PCI_VNDR_HEADER, &val); + bdf = PCI_DEVID(pdev->bus->number, pdev->devfn); + name = devm_kasprintf(&plat_dev->dev, GFP_KERNEL, "dwc_rootport_%x", bdf); + if (!name) + return -ENOMEM; + + pcie_pmu = devm_kzalloc(&plat_dev->dev, sizeof(*pcie_pmu), GFP_KERNEL); + if (!pcie_pmu) + return -ENOMEM; + + pcie_pmu->pdev = pdev; + pcie_pmu->ras_des_offset = vsec; + pcie_pmu->nr_lanes = pcie_get_width_cap(pdev); + pcie_pmu->on_cpu = -1; + pcie_pmu->pmu = (struct pmu){ + .name = name, + .parent = &pdev->dev, + .module = THIS_MODULE, + .attr_groups = dwc_pcie_attr_groups, + .capabilities = PERF_PMU_CAP_NO_EXCLUDE, + .task_ctx_nr = perf_invalid_context, + .event_init = dwc_pcie_pmu_event_init, + .add = dwc_pcie_pmu_event_add, + .del = dwc_pcie_pmu_event_del, + .start = dwc_pcie_pmu_event_start, + .stop = dwc_pcie_pmu_event_stop, + .read = dwc_pcie_pmu_event_update, + }; + + /* Add this instance to the list used by the offline callback */ + ret = cpuhp_state_add_instance(dwc_pcie_pmu_hp_state, + &pcie_pmu->cpuhp_node); + if (ret) { + pci_err(pdev, "Error %d registering hotplug @%x\n", ret, bdf); + return ret; + } + + /* Unwind when platform driver removes */ + ret = devm_add_action_or_reset(&plat_dev->dev, + dwc_pcie_pmu_remove_cpuhp_instance, + &pcie_pmu->cpuhp_node); + if (ret) + return ret; + + ret = perf_pmu_register(&pcie_pmu->pmu, name, -1); + if (ret) { + pci_err(pdev, "Error %d registering PMU @%x\n", ret, bdf); + return ret; + } + ret = devm_add_action_or_reset(&plat_dev->dev, dwc_pcie_unregister_pmu, + pcie_pmu); + if (ret) + return ret; + + return 0; +} + +static int dwc_pcie_pmu_online_cpu(unsigned int cpu, struct hlist_node *cpuhp_node) +{ + struct dwc_pcie_pmu *pcie_pmu; + + pcie_pmu = hlist_entry_safe(cpuhp_node, struct dwc_pcie_pmu, cpuhp_node); + if (pcie_pmu->on_cpu == -1) + pcie_pmu->on_cpu = cpumask_local_spread( + 0, dev_to_node(&pcie_pmu->pdev->dev)); + + return 0; +} + +static int dwc_pcie_pmu_offline_cpu(unsigned int cpu, struct hlist_node *cpuhp_node) +{ + struct dwc_pcie_pmu *pcie_pmu; + struct pci_dev *pdev; + int node; + cpumask_t mask; + unsigned int target; + + pcie_pmu = hlist_entry_safe(cpuhp_node, struct dwc_pcie_pmu, cpuhp_node); + /* Nothing to do if this CPU doesn't own the PMU */ + if (cpu != pcie_pmu->on_cpu) + return 0; + + pcie_pmu->on_cpu = -1; + pdev = pcie_pmu->pdev; + node = dev_to_node(&pdev->dev); + if (cpumask_and(&mask, cpumask_of_node(node), cpu_online_mask) && + cpumask_andnot(&mask, &mask, cpumask_of(cpu))) + target = cpumask_any(&mask); + else + target = cpumask_any_but(cpu_online_mask, cpu); + + if (target >= nr_cpu_ids) { + pci_err(pdev, "There is no CPU to set\n"); + return 0; + } + + /* This PMU does NOT support interrupt, just migrate context. */ + perf_pmu_migrate_context(&pcie_pmu->pmu, cpu, target); + pcie_pmu->on_cpu = target; + + return 0; +} + +static struct platform_driver dwc_pcie_pmu_driver = { + .probe = dwc_pcie_pmu_probe, + .driver = {.name = "dwc_pcie_pmu",}, +}; + +static int __init dwc_pcie_pmu_init(void) +{ + struct pci_dev *pdev = NULL; + bool found = false; + int ret; + + for_each_pci_dev(pdev) { + if (!dwc_pcie_match_des_cap(pdev)) + continue; + + ret = dwc_pcie_register_dev(pdev); + if (ret) { + pci_dev_put(pdev); + return ret; + } + + found = true; + } + if (!found) + return -ENODEV; + + ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, + "perf/dwc_pcie_pmu:online", + dwc_pcie_pmu_online_cpu, + dwc_pcie_pmu_offline_cpu); + if (ret < 0) + return ret; + + dwc_pcie_pmu_hp_state = ret; + + ret = platform_driver_register(&dwc_pcie_pmu_driver); + if (ret) + goto platform_driver_register_err; + + ret = bus_register_notifier(&pci_bus_type, &dwc_pcie_pmu_nb); + if (ret) + goto platform_driver_register_err; + notify = true; + + return 0; + +platform_driver_register_err: + cpuhp_remove_multi_state(dwc_pcie_pmu_hp_state); + + return ret; +} + +static void __exit dwc_pcie_pmu_exit(void) +{ + struct dwc_pcie_dev_info *dev_info, *tmp; + + if (notify) + bus_unregister_notifier(&pci_bus_type, &dwc_pcie_pmu_nb); + list_for_each_entry_safe(dev_info, tmp, &dwc_pcie_dev_info_head, dev_node) + dwc_pcie_unregister_dev(dev_info); + platform_driver_unregister(&dwc_pcie_pmu_driver); + cpuhp_remove_multi_state(dwc_pcie_pmu_hp_state); +} + +module_init(dwc_pcie_pmu_init); +module_exit(dwc_pcie_pmu_exit); + +MODULE_DESCRIPTION("PMU driver for DesignWare Cores PCI Express Controller"); +MODULE_AUTHOR("Shuai Xue <xueshuai@linux.alibaba.com>"); +MODULE_LICENSE("GPL v2"); |