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SubjectRe: [PATCH v9 2/8] hwtracing: hisi_ptt: Add trace function support for HiSilicon PCIe Tune and Trace device
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On 2022/7/12 1:41, Mathieu Poirier wrote:
> On Mon, Jun 06, 2022 at 07:55:49PM +0800, Yicong Yang wrote:
>> HiSilicon PCIe tune and trace device(PTT) is a PCIe Root Complex integrated
>> Endpoint(RCiEP) device, providing the capability to dynamically monitor and
>> tune the PCIe traffic and trace the TLP headers.
>>
>> Add the driver for the device to enable the trace function. Register PMU
>> device of PTT trace, then users can use trace through perf command. The
>> driver makes use of perf AUX trace function and support the following
>> events to configure the trace:
>>
>> - filter: select Root port or Endpoint to trace
>> - type: select the type of traced TLP headers
>> - direction: select the direction of traced TLP headers
>> - format: select the data format of the traced TLP headers
>>
>> This patch initially add basic trace support of PTT device.
>>
>> Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
>> Reviewed-by: John Garry <john.garry@huawei.com>
>> Signed-off-by: Yicong Yang <yangyicong@hisilicon.com>
>> ---
>> drivers/Makefile | 1 +
>> drivers/hwtracing/Kconfig | 2 +
>> drivers/hwtracing/ptt/Kconfig | 12 +
>> drivers/hwtracing/ptt/Makefile | 2 +
>> drivers/hwtracing/ptt/hisi_ptt.c | 956 +++++++++++++++++++++++++++++++
>> drivers/hwtracing/ptt/hisi_ptt.h | 177 ++++++
>> 6 files changed, 1150 insertions(+)
>> create mode 100644 drivers/hwtracing/ptt/Kconfig
>> create mode 100644 drivers/hwtracing/ptt/Makefile
>> create mode 100644 drivers/hwtracing/ptt/hisi_ptt.c
>> create mode 100644 drivers/hwtracing/ptt/hisi_ptt.h
>>
>> diff --git a/drivers/Makefile b/drivers/Makefile
>> index 9a30842b22c5..bf67e0e23c18 100644
>> --- a/drivers/Makefile
>> +++ b/drivers/Makefile
>> @@ -176,6 +176,7 @@ obj-$(CONFIG_USB4) += thunderbolt/
>> obj-$(CONFIG_CORESIGHT) += hwtracing/coresight/
>> obj-y += hwtracing/intel_th/
>> obj-$(CONFIG_STM) += hwtracing/stm/
>> +obj-$(CONFIG_HISI_PTT) += hwtracing/ptt/
>> obj-$(CONFIG_ANDROID) += android/
>> obj-$(CONFIG_NVMEM) += nvmem/
>> obj-$(CONFIG_FPGA) += fpga/
>> diff --git a/drivers/hwtracing/Kconfig b/drivers/hwtracing/Kconfig
>> index 13085835a636..911ee977103c 100644
>> --- a/drivers/hwtracing/Kconfig
>> +++ b/drivers/hwtracing/Kconfig
>> @@ -5,4 +5,6 @@ source "drivers/hwtracing/stm/Kconfig"
>>
>> source "drivers/hwtracing/intel_th/Kconfig"
>>
>> +source "drivers/hwtracing/ptt/Kconfig"
>> +
>> endmenu
>> diff --git a/drivers/hwtracing/ptt/Kconfig b/drivers/hwtracing/ptt/Kconfig
>> new file mode 100644
>> index 000000000000..6d46a09ffeb9
>> --- /dev/null
>> +++ b/drivers/hwtracing/ptt/Kconfig
>> @@ -0,0 +1,12 @@
>> +# SPDX-License-Identifier: GPL-2.0-only
>> +config HISI_PTT
>> + tristate "HiSilicon PCIe Tune and Trace Device"
>> + depends on ARM64 || (COMPILE_TEST && 64BIT)
>> + depends on PCI && HAS_DMA && HAS_IOMEM && PERF_EVENTS
>> + help
>> + HiSilicon PCIe Tune and Trace device exists as a PCIe RCiEP
>> + device, and it provides support for PCIe traffic tuning and
>> + tracing TLP headers to the memory.
>> +
>> + This driver can also be built as a module. If so, the module
>> + will be called hisi_ptt.
>> diff --git a/drivers/hwtracing/ptt/Makefile b/drivers/hwtracing/ptt/Makefile
>> new file mode 100644
>> index 000000000000..908c09a98161
>> --- /dev/null
>> +++ b/drivers/hwtracing/ptt/Makefile
>> @@ -0,0 +1,2 @@
>> +# SPDX-License-Identifier: GPL-2.0
>> +obj-$(CONFIG_HISI_PTT) += hisi_ptt.o
>> diff --git a/drivers/hwtracing/ptt/hisi_ptt.c b/drivers/hwtracing/ptt/hisi_ptt.c
>> new file mode 100644
>> index 000000000000..e317be2e1311
>> --- /dev/null
>> +++ b/drivers/hwtracing/ptt/hisi_ptt.c
>> @@ -0,0 +1,956 @@
>> +// 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>
>> + */
>> +
>> +#include <linux/bitfield.h>
>> +#include <linux/bitops.h>
>> +#include <linux/cpuhotplug.h>
>> +#include <linux/delay.h>
>> +#include <linux/dma-iommu.h>
>> +#include <linux/dma-mapping.h>
>> +#include <linux/interrupt.h>
>> +#include <linux/io.h>
>> +#include <linux/iommu.h>
>> +#include <linux/iopoll.h>
>> +#include <linux/module.h>
>> +#include <linux/sysfs.h>
>> +#include <linux/vmalloc.h>
>> +
>> +#include "hisi_ptt.h"
>> +
>> +/* Dynamic CPU hotplug state used by PTT */
>> +static enum cpuhp_state hisi_ptt_pmu_online;
>> +
>> +static u16 hisi_ptt_get_filter_val(u16 devid, bool is_port)
>> +{
>> + if (is_port)
>> + return BIT(HISI_PCIE_CORE_PORT_ID(devid & 0xff));
>> +
>> + return devid;
>> +}
>> +
>> +static bool hisi_ptt_wait_trace_hw_idle(struct hisi_ptt *hisi_ptt)
>> +{
>> + u32 val;
>> +
>> + return !readl_poll_timeout_atomic(hisi_ptt->iobase + HISI_PTT_TRACE_STS,
>> + val, val & HISI_PTT_TRACE_IDLE,
>> + HISI_PTT_WAIT_POLL_INTERVAL_US,
>> + HISI_PTT_WAIT_TRACE_TIMEOUT_US);
>> +}
>> +
>> +static void hisi_ptt_wait_dma_reset_done(struct hisi_ptt *hisi_ptt)
>> +{
>> + u32 val;
>> +
>> + readl_poll_timeout_atomic(hisi_ptt->iobase + HISI_PTT_TRACE_WR_STS,
>> + val, !val, HISI_PTT_RESET_POLL_INTERVAL_US,
>> + HISI_PTT_RESET_TIMEOUT_US);
>> +}
>> +
>> +static void hisi_ptt_trace_end(struct hisi_ptt *hisi_ptt)
>> +{
>> + writel(0, hisi_ptt->iobase + HISI_PTT_TRACE_CTRL);
>> + hisi_ptt->trace_ctrl.started = false;
>> +}
>> +
>> +static int hisi_ptt_trace_start(struct hisi_ptt *hisi_ptt)
>> +{
>> + struct hisi_ptt_trace_ctrl *ctrl = &hisi_ptt->trace_ctrl;
>> + u32 val;
>> + int i;
>> +
>> + /* Check device idle before start trace */
>> + if (!hisi_ptt_wait_trace_hw_idle(hisi_ptt)) {
>> + pci_err(hisi_ptt->pdev, "Failed to start trace, the device is still busy\n");
>> + return -EBUSY;
>> + }
>> +
>> + ctrl->started = true;
>> +
>> + /* Reset the DMA before start tracing */
>> + val = readl(hisi_ptt->iobase + HISI_PTT_TRACE_CTRL);
>> + val |= HISI_PTT_TRACE_CTRL_RST;
>> + writel(val, hisi_ptt->iobase + HISI_PTT_TRACE_CTRL);
>> +
>> + hisi_ptt_wait_dma_reset_done(hisi_ptt);
>> +
>> + val = readl(hisi_ptt->iobase + HISI_PTT_TRACE_CTRL);
>> + val &= ~HISI_PTT_TRACE_CTRL_RST;
>> + writel(val, hisi_ptt->iobase + HISI_PTT_TRACE_CTRL);
>> +
>> + /* Reset the index of current buffer */
>> + hisi_ptt->trace_ctrl.buf_index = 0;
>> +
>> + /* Zero the trace buffers */
>> + for (i = 0; i < HISI_PTT_TRACE_BUF_CNT; i++)
>> + memset(ctrl->trace_buf[i].addr, 0, HISI_PTT_TRACE_BUF_SIZE);
>> +
>> + /* Clear the interrupt status */
>> + writel(HISI_PTT_TRACE_INT_STAT_MASK, hisi_ptt->iobase + HISI_PTT_TRACE_INT_STAT);
>> + writel(0, hisi_ptt->iobase + HISI_PTT_TRACE_INT_MASK);
>> +
>> + /* Set the trace control register */
>> + val = FIELD_PREP(HISI_PTT_TRACE_CTRL_TYPE_SEL, ctrl->type);
>> + val |= FIELD_PREP(HISI_PTT_TRACE_CTRL_RXTX_SEL, ctrl->direction);
>> + val |= FIELD_PREP(HISI_PTT_TRACE_CTRL_DATA_FORMAT, ctrl->format);
>> + val |= FIELD_PREP(HISI_PTT_TRACE_CTRL_TARGET_SEL, hisi_ptt->trace_ctrl.filter);
>> + if (!hisi_ptt->trace_ctrl.is_port)
>> + val |= HISI_PTT_TRACE_CTRL_FILTER_MODE;
>> +
>> + /* Start the Trace */
>> + val |= HISI_PTT_TRACE_CTRL_EN;
>> + writel(val, hisi_ptt->iobase + HISI_PTT_TRACE_CTRL);
>> +
>> + return 0;
>> +}
>> +
>> +static int hisi_ptt_update_aux(struct hisi_ptt *hisi_ptt, int index, bool stop)
>> +{
>> + struct hisi_ptt_trace_ctrl *ctrl = &hisi_ptt->trace_ctrl;
>> + struct perf_output_handle *handle = &ctrl->handle;
>> + struct perf_event *event = handle->event;
>> + struct hisi_ptt_pmu_buf *buf;
>> + size_t size;
>> + void *addr;
>> +
>> + buf = perf_get_aux(handle);
>> + if (!buf || !handle->size)
>> + return -EINVAL;
>> +
>> + addr = ctrl->trace_buf[ctrl->buf_index].addr;
>> +
>> + /*
>> + * If we're going to stop, read the size of already traced data from
>> + * HISI_PTT_TRACE_WR_STS. Otherwise we're coming from the interrupt,
>> + * the data size is always HISI_PTT_TRACE_BUF_SIZE.
>> + */
>> + if (stop) {
>> + u32 reg;
>> +
>> + reg = readl(hisi_ptt->iobase + HISI_PTT_TRACE_WR_STS);
>> + size = FIELD_GET(HISI_PTT_TRACE_WR_STS_WRITE, reg);
>> + } else {
>> + size = HISI_PTT_TRACE_BUF_SIZE;
>> + }
>> +
>> + memcpy(buf->base + buf->pos, addr, size);
>> + buf->pos += size;
>> +
>> + /*
>> + * Just commit the traced data if we're going to stop. Otherwise if the
>> + * resident AUX buffer cannot contain the data of next trace buffer,
>> + * apply a new one.
>> + */
>> + if (stop) {
>> + perf_aux_output_end(handle, buf->pos);
>> + } else if (buf->length - buf->pos < HISI_PTT_TRACE_BUF_SIZE) {
>> + perf_aux_output_end(handle, buf->pos);
>> +
>> + buf = perf_aux_output_begin(handle, event);
>> + if (!buf)
>> + return -EINVAL;
>> +
>> + buf->pos = handle->head % buf->length;
>> + if (buf->length - buf->pos < HISI_PTT_TRACE_BUF_SIZE) {
>> + perf_aux_output_end(handle, 0);
>> + return -EINVAL;
>> + }
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static irqreturn_t hisi_ptt_isr(int irq, void *context)
>> +{
>> + struct hisi_ptt *hisi_ptt = context;
>> + u32 status, buf_idx;
>> +
>> + status = readl(hisi_ptt->iobase + HISI_PTT_TRACE_INT_STAT);
>> + if (!(status & HISI_PTT_TRACE_INT_STAT_MASK))
>> + return IRQ_NONE;
>> +
>> + buf_idx = ffs(status) - 1;
>> +
>> + /* Clear the interrupt status of buffer @buf_idx */
>> + writel(status, hisi_ptt->iobase + HISI_PTT_TRACE_INT_STAT);
>> +
>> + /*
>> + * Update the AUX buffer and cache the current buffer index,
>> + * as we need to know this and save the data when the trace
>> + * is ended out of the interrupt handler. End the trace
>> + * if the updating fails.
>> + */
>> + if (hisi_ptt_update_aux(hisi_ptt, buf_idx, false))
>> + hisi_ptt_trace_end(hisi_ptt);
>> + else
>> + hisi_ptt->trace_ctrl.buf_index = (buf_idx + 1) % HISI_PTT_TRACE_BUF_CNT;
>> +
>> + return IRQ_HANDLED;
>> +}
>> +
>> +static void hisi_ptt_irq_free_vectors(void *pdev)
>> +{
>> + pci_free_irq_vectors(pdev);
>> +}
>> +
>> +static int hisi_ptt_register_irq(struct hisi_ptt *hisi_ptt)
>> +{
>> + struct pci_dev *pdev = hisi_ptt->pdev;
>> + int ret;
>> +
>> + ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI);
>> + if (ret < 0) {
>> + pci_err(pdev, "failed to allocate irq vector, ret = %d\n", ret);
>> + return ret;
>> + }
>> +
>> + ret = devm_add_action_or_reset(&pdev->dev, hisi_ptt_irq_free_vectors, pdev);
>> + if (ret < 0)
>> + return ret;
>> +
>> + ret = devm_request_threaded_irq(&pdev->dev,
>> + pci_irq_vector(pdev, HISI_PTT_TRACE_DMA_IRQ),
>> + NULL, hisi_ptt_isr, 0,
>> + DRV_NAME, hisi_ptt);
>> + if (ret) {
>> + pci_err(pdev, "failed to request irq %d, ret = %d\n",
>> + pci_irq_vector(pdev, HISI_PTT_TRACE_DMA_IRQ), ret);
>> + return ret;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static int hisi_ptt_init_filters(struct pci_dev *pdev, void *data)
>> +{
>> + struct hisi_ptt_filter_desc *filter;
>> + struct hisi_ptt *hisi_ptt = data;
>> +
>> + /*
>> + * We won't fail the probe if filter allocation failed here. The filters
>> + * should be partial initialized and users would know which filter fails
>> + * through the log. Other functions of PTT device are still available.
>> + */
>> + filter = kzalloc(sizeof(*filter), GFP_KERNEL);
>> + if (!filter) {
>> + pci_err(hisi_ptt->pdev, "failed to add filter %s\n", pci_name(pdev));
>> + return -ENOMEM;
>> + }
>> +
>> + filter->devid = PCI_DEVID(pdev->bus->number, pdev->devfn);
>> +
>> + if (pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT) {
>> + filter->is_port = true;
>> + list_add_tail(&filter->list, &hisi_ptt->port_filters);
>> +
>> + /* Update the available port mask */
>> + hisi_ptt->port_mask |= hisi_ptt_get_filter_val(filter->devid, true);
>> + } else {
>> + list_add_tail(&filter->list, &hisi_ptt->req_filters);
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static void hisi_ptt_release_filters(void *data)
>> +{
>> + struct hisi_ptt_filter_desc *filter, *tmp;
>> + struct hisi_ptt *hisi_ptt = data;
>> +
>> + list_for_each_entry_safe(filter, tmp, &hisi_ptt->req_filters, list) {
>> + list_del(&filter->list);
>> + kfree(filter);
>> + }
>> +
>> + list_for_each_entry_safe(filter, tmp, &hisi_ptt->port_filters, list) {
>> + list_del(&filter->list);
>> + kfree(filter);
>> + }
>> +}
>> +
>> +static int hisi_ptt_config_trace_buf(struct hisi_ptt *hisi_ptt)
>> +{
>> + struct hisi_ptt_trace_ctrl *ctrl = &hisi_ptt->trace_ctrl;
>> + struct device *dev = &hisi_ptt->pdev->dev;
>> + int i;
>> +
>> + ctrl->trace_buf = devm_kcalloc(dev, HISI_PTT_TRACE_BUF_CNT,
>> + sizeof(*ctrl->trace_buf), GFP_KERNEL);
>> + if (!ctrl->trace_buf)
>> + return -ENOMEM;
>> +
>> + for (i = 0; i < HISI_PTT_TRACE_BUF_CNT; ++i) {
>> + ctrl->trace_buf[i].addr = dmam_alloc_coherent(dev, HISI_PTT_TRACE_BUF_SIZE,
>> + &ctrl->trace_buf[i].dma,
>> + GFP_KERNEL);
>> + if (!ctrl->trace_buf[i].addr)
>> + return -ENOMEM;
>> + }
>> +
>> + /* Configure the trace DMA buffer */
>> + for (i = 0; i < HISI_PTT_TRACE_BUF_CNT; i++) {
>> + writel(lower_32_bits(ctrl->trace_buf[i].dma),
>> + hisi_ptt->iobase + HISI_PTT_TRACE_ADDR_BASE_LO_0 +
>> + i * HISI_PTT_TRACE_ADDR_STRIDE);
>> + writel(upper_32_bits(ctrl->trace_buf[i].dma),
>> + hisi_ptt->iobase + HISI_PTT_TRACE_ADDR_BASE_HI_0 +
>> + i * HISI_PTT_TRACE_ADDR_STRIDE);
>> + }
>> + writel(HISI_PTT_TRACE_BUF_SIZE, hisi_ptt->iobase + HISI_PTT_TRACE_ADDR_SIZE);
>> +
>> + return 0;
>> +}
>> +
>> +static int hisi_ptt_init_ctrls(struct hisi_ptt *hisi_ptt)
>> +{
>> + struct pci_dev *pdev = hisi_ptt->pdev;
>> + struct pci_bus *bus;
>> + int ret;
>> + u32 reg;
>> +
>> + INIT_LIST_HEAD(&hisi_ptt->port_filters);
>> + INIT_LIST_HEAD(&hisi_ptt->req_filters);
>> +
>> + ret = hisi_ptt_config_trace_buf(hisi_ptt);
>> + if (ret)
>> + return ret;
>> +
>> + /*
>> + * The device range register provides the information about the root
>> + * ports which the RCiEP can control and trace. The RCiEP and the root
>> + * ports which it supports are on the same PCIe core, with same domain
>> + * number but maybe different bus number. The device range register
>> + * will tell us which root ports we can support, Bit[31:16] indicates
>> + * the upper BDF numbers of the root port, while Bit[15:0] indicates
>> + * the lower.
>> + */
>> + reg = readl(hisi_ptt->iobase + HISI_PTT_DEVICE_RANGE);
>> + hisi_ptt->upper_bdf = FIELD_GET(HISI_PTT_DEVICE_RANGE_UPPER, reg);
>> + hisi_ptt->lower_bdf = FIELD_GET(HISI_PTT_DEVICE_RANGE_LOWER, reg);
>> +
>> + bus = pci_find_bus(pci_domain_nr(pdev->bus), PCI_BUS_NUM(hisi_ptt->upper_bdf));
>> + if (bus)
>> + pci_walk_bus(bus, hisi_ptt_init_filters, hisi_ptt);
>> +
>> + ret = devm_add_action_or_reset(&pdev->dev, hisi_ptt_release_filters, hisi_ptt);
>> + if (ret)
>> + return ret;
>> +
>> + hisi_ptt->trace_ctrl.on_cpu = -1;
>> + return 0;
>> +}
>> +
>> +static ssize_t available_root_port_filters_show(struct device *dev,
>> + struct device_attribute *attr,
>> + char *buf)
>> +{
>> + struct hisi_ptt *hisi_ptt = to_hisi_ptt(dev_get_drvdata(dev));
>> + struct hisi_ptt_filter_desc *filter;
>> + int pos = 0;
>> +
>> + if (list_empty(&hisi_ptt->port_filters))
>> + return sysfs_emit(buf, "\n");
>> +
>> + list_for_each_entry(filter, &hisi_ptt->port_filters, list) {
>> + u16 devid = filter->devid;
>> +
>> + pos += sysfs_emit_at(buf, pos, "%04x:%02x:%02x.%d\t0x%05lx\n",
>> + pci_domain_nr(hisi_ptt->pdev->bus),
>> + PCI_BUS_NUM(devid),
>> + PCI_SLOT(devid & 0xff),
>> + PCI_FUNC(devid & 0xff),
>> + hisi_ptt_get_filter_val(devid, true) |
>> + HISI_PTT_PMU_FILTER_IS_PORT);
>> + }
>> +
>> + return pos;
>> +}
>> +static DEVICE_ATTR_ADMIN_RO(available_root_port_filters);
>> +
>> +static ssize_t available_requester_filters_show(struct device *dev,
>> + struct device_attribute *attr,
>> + char *buf)
>> +{
>> + struct hisi_ptt *hisi_ptt = to_hisi_ptt(dev_get_drvdata(dev));
>> + struct hisi_ptt_filter_desc *filter;
>> + int pos = 0;
>> +
>> + if (list_empty(&hisi_ptt->req_filters))
>> + return sysfs_emit(buf, "\n");
>> +
>> + list_for_each_entry(filter, &hisi_ptt->req_filters, list) {
>> + u16 devid = filter->devid;
>> +
>> + pos += sysfs_emit_at(buf, pos, "%04x:%02x:%02x.%d\t0x%05x\n",
>> + pci_domain_nr(hisi_ptt->pdev->bus),
>> + PCI_BUS_NUM(devid),
>> + PCI_SLOT(devid & 0xff),
>> + PCI_FUNC(devid & 0xff),
>> + hisi_ptt_get_filter_val(devid, false));
>> + }
>> +
>> + return pos;
>> +}
>> +static DEVICE_ATTR_ADMIN_RO(available_requester_filters);
>> +
>> +static ssize_t cpumask_show(struct device *dev, struct device_attribute *attr,
>> + char *buf)
>> +{
>> + struct hisi_ptt *hisi_ptt = to_hisi_ptt(dev_get_drvdata(dev));
>> + const cpumask_t *cpumask = cpumask_of_node(dev_to_node(&hisi_ptt->pdev->dev));
>> +
>> + return cpumap_print_to_pagebuf(true, buf, cpumask);
>> +}
>> +static DEVICE_ATTR_RO(cpumask);
>> +
>> +static struct attribute *hisi_ptt_cpumask_attrs[] = {
>> + &dev_attr_cpumask.attr,
>> + NULL
>> +};
>> +
>> +static const struct attribute_group hisi_ptt_cpumask_attr_group = {
>> + .attrs = hisi_ptt_cpumask_attrs,
>> +};
>> +
>> +PMU_FORMAT_ATTR(filter, "config:0-19");
>
> Here bit 0-19 are for filters but HISI_PTT_PMU_FILTER_IS_PORT is only for bit 19
> and HISI_PTT_PMU_FILTER_VAL_MASK defines a mask for bits 0-15. What is going on
> with bit 16-18? If this is a bug then it should be fixed, if not some inline
> documentation is required.
>

I'll add some comment here. It's designed on purpose to reserve some bits for the
filter for the extension, otherwise we need a new config field if more filter
is introduced.

>> +PMU_FORMAT_ATTR(direction, "config:20-23");
>> +PMU_FORMAT_ATTR(type, "config:24-31");
>> +PMU_FORMAT_ATTR(format, "config:32-35");
>> +
>> +static struct attribute *hisi_ptt_pmu_format_attrs[] = {
>> + &format_attr_filter.attr,
>> + &format_attr_direction.attr,
>> + &format_attr_type.attr,
>> + &format_attr_format.attr,
>> + NULL
>> +};
>> +
>> +static struct attribute_group hisi_ptt_pmu_format_group = {
>> + .name = "format",
>> + .attrs = hisi_ptt_pmu_format_attrs,
>> +};
>> +
>> +static struct attribute *hisi_ptt_pmu_filter_attrs[] = {
>> + &dev_attr_available_root_port_filters.attr,
>> + &dev_attr_available_requester_filters.attr,
>> + NULL
>> +};
>> +
>> +static struct attribute_group hisi_ptt_pmu_filter_group = {
>> + .attrs = hisi_ptt_pmu_filter_attrs,
>> +};
>> +
>> +static const struct attribute_group *hisi_ptt_pmu_groups[] = {
>> + &hisi_ptt_cpumask_attr_group,
>> + &hisi_ptt_pmu_format_group,
>> + &hisi_ptt_pmu_filter_group,
>> + NULL
>> +};
>> +
>> +static int hisi_ptt_trace_valid_direction(u32 val)
>> +{
>> + /*
>> + * The supported value of the direction parameter. See hisi_ptt.rst
>> + * documentation for more details.
>> + */
>> + static const u32 hisi_ptt_trace_available_direction[] = {
>> + 0,
>> + 1,
>> + 2,
>> + 3,
>> + };
>
> I would not have commented otherwise but since you are re-spinning this, I think
> there would be value in documenting the value of the direction parameters like
> it was done in hisi_ptt_trace_valid_type(). That way one doesn't have to go
> fish out the values in hisi_ptt.rst
>

Since the value will have different effects according to the data format so I lead
the reader to the documentation for more detailed information. Will enrich a bit
here like:

/*
* The direction values have different effects according to the data
* format (specified in the parentheses). TLP set A/B means different
* set of TLP types. See hisi_ptt.rst documentation for more details.
*/
static const u32 hisi_ptt_trace_available_direction[] = {
0, /* inbound(4DW) or reserved(8DW) */
1, /* outbound(4DW) */
2, /* {in, out}bound(4DW) or inbound(8DW), TLP set A */
3, /* {in, out}bound(4DW) or inbound(8DW), TLP set B */
};

> With the above:
> Acked-by: Mathieu Poirier <mathieu.poirier@linaro.org>
>

Thanks a lot for the review!

Regards.

>> + int i;
>> +
>> + for (i = 0; i < ARRAY_SIZE(hisi_ptt_trace_available_direction); i++) {
>> + if (val == hisi_ptt_trace_available_direction[i])
>> + return 0;
>> + }
>> +
>> + return -EINVAL;
>> +}
>> +
>> +static int hisi_ptt_trace_valid_type(u32 val)
>> +{
>> + /* Different types can be set simultaneously */
>> + static const u32 hisi_ptt_trace_available_type[] = {
>> + 1, /* posted_request */
>> + 2, /* non-posted_request */
>> + 4, /* completion */
>> + };
>> + int i;
>> +
>> + if (!val)
>> + return -EINVAL;
>> +
>> + /*
>> + * Walk the available list and clear the valid bits of
>> + * the config. If there is any resident bit after the
>> + * walk then the config is invalid.
>> + */
>> + for (i = 0; i < ARRAY_SIZE(hisi_ptt_trace_available_type); i++)
>> + val &= ~hisi_ptt_trace_available_type[i];
>> +
>> + if (val)
>> + return -EINVAL;
>> +
>> + return 0;
>> +}
>> +
>> +static int hisi_ptt_trace_valid_format(u32 val)
>> +{
>> + static const u32 hisi_ptt_trace_availble_format[] = {
>> + 0, /* 4DW */
>> + 1, /* 8DW */
>> + };
>> + int i;
>> +
>> + for (i = 0; i < ARRAY_SIZE(hisi_ptt_trace_availble_format); i++) {
>> + if (val == hisi_ptt_trace_availble_format[i])
>> + return 0;
>> + }
>> +
>> + return -EINVAL;
>> +}
>> +
>> +static int hisi_ptt_trace_valid_filter(struct hisi_ptt *hisi_ptt, u64 config)
>> +{
>> + unsigned long val, port_mask = hisi_ptt->port_mask;
>> + struct hisi_ptt_filter_desc *filter;
>> +
>> + hisi_ptt->trace_ctrl.is_port = FIELD_GET(HISI_PTT_PMU_FILTER_IS_PORT, config);
>> + val = FIELD_GET(HISI_PTT_PMU_FILTER_VAL_MASK, config);
>> +
>> + /*
>> + * Port filters are defined as bit mask. For port filters, check
>> + * the bits in the @val are within the range of hisi_ptt->port_mask
>> + * and whether it's empty or not, otherwise user has specified
>> + * some unsupported root ports.
>> + *
>> + * For Requester ID filters, walk the available filter list to see
>> + * whether we have one matched.
>> + */
>> + if (!hisi_ptt->trace_ctrl.is_port) {
>> + list_for_each_entry(filter, &hisi_ptt->req_filters, list) {
>> + if (val == hisi_ptt_get_filter_val(filter->devid, filter->is_port))
>> + return 0;
>> + }
>> + } else if (bitmap_subset(&val, &port_mask, BITS_PER_LONG)) {
>> + return 0;
>> + }
>> +
>> + return -EINVAL;
>> +}
>> +
>> +static void hisi_ptt_pmu_init_configs(struct hisi_ptt *hisi_ptt, struct perf_event *event)
>> +{
>> + struct hisi_ptt_trace_ctrl *ctrl = &hisi_ptt->trace_ctrl;
>> + u32 val;
>> +
>> + val = FIELD_GET(HISI_PTT_PMU_FILTER_VAL_MASK, event->attr.config);
>> + hisi_ptt->trace_ctrl.filter = val;
>> +
>> + val = FIELD_GET(HISI_PTT_PMU_DIRECTION_MASK, event->attr.config);
>> + ctrl->direction = val;
>> +
>> + val = FIELD_GET(HISI_PTT_PMU_TYPE_MASK, event->attr.config);
>> + ctrl->type = val;
>> +
>> + val = FIELD_GET(HISI_PTT_PMU_FORMAT_MASK, event->attr.config);
>> + ctrl->format = val;
>> +}
>> +
>> +static int hisi_ptt_pmu_event_init(struct perf_event *event)
>> +{
>> + struct hisi_ptt *hisi_ptt = to_hisi_ptt(event->pmu);
>> + int ret;
>> + u32 val;
>> +
>> + if (event->cpu < 0) {
>> + dev_dbg(event->pmu->dev, "Per-task mode not supported\n");
>> + return -EOPNOTSUPP;
>> + }
>> +
>> + if (event->attr.type != hisi_ptt->hisi_ptt_pmu.type)
>> + return -ENOENT;
>> +
>> + ret = hisi_ptt_trace_valid_filter(hisi_ptt, event->attr.config);
>> + if (ret < 0)
>> + return ret;
>> +
>> + val = FIELD_GET(HISI_PTT_PMU_DIRECTION_MASK, event->attr.config);
>> + ret = hisi_ptt_trace_valid_direction(val);
>> + if (ret < 0)
>> + return ret;
>> +
>> + val = FIELD_GET(HISI_PTT_PMU_TYPE_MASK, event->attr.config);
>> + ret = hisi_ptt_trace_valid_type(val);
>> + if (ret < 0)
>> + return ret;
>> +
>> + val = FIELD_GET(HISI_PTT_PMU_FORMAT_MASK, event->attr.config);
>> + return hisi_ptt_trace_valid_format(val);
>> +}
>> +
>> +static void *hisi_ptt_pmu_setup_aux(struct perf_event *event, void **pages,
>> + int nr_pages, bool overwrite)
>> +{
>> + struct hisi_ptt_pmu_buf *buf;
>> + struct page **pagelist;
>> + int i;
>> +
>> + if (overwrite) {
>> + dev_warn(event->pmu->dev, "Overwrite mode is not supported\n");
>> + return NULL;
>> + }
>> +
>> + /* If the pages size less than buffers, we cannot start trace */
>> + if (nr_pages < HISI_PTT_TRACE_TOTAL_BUF_SIZE / PAGE_SIZE)
>> + return NULL;
>> +
>> + buf = kzalloc(sizeof(*buf), GFP_KERNEL);
>> + if (!buf)
>> + return NULL;
>> +
>> + pagelist = kcalloc(nr_pages, sizeof(*pagelist), GFP_KERNEL);
>> + if (!pagelist)
>> + goto err;
>> +
>> + for (i = 0; i < nr_pages; i++)
>> + pagelist[i] = virt_to_page(pages[i]);
>> +
>> + buf->base = vmap(pagelist, nr_pages, VM_MAP, PAGE_KERNEL);
>> + if (!buf->base) {
>> + kfree(pagelist);
>> + goto err;
>> + }
>> +
>> + buf->nr_pages = nr_pages;
>> + buf->length = nr_pages * PAGE_SIZE;
>> + buf->pos = 0;
>> +
>> + kfree(pagelist);
>> + return buf;
>> +err:
>> + kfree(buf);
>> + return NULL;
>> +}
>> +
>> +static void hisi_ptt_pmu_free_aux(void *aux)
>> +{
>> + struct hisi_ptt_pmu_buf *buf = aux;
>> +
>> + vunmap(buf->base);
>> + kfree(buf);
>> +}
>> +
>> +static void hisi_ptt_pmu_start(struct perf_event *event, int flags)
>> +{
>> + struct hisi_ptt *hisi_ptt = to_hisi_ptt(event->pmu);
>> + struct perf_output_handle *handle = &hisi_ptt->trace_ctrl.handle;
>> + struct hw_perf_event *hwc = &event->hw;
>> + struct device *dev = event->pmu->dev;
>> + struct hisi_ptt_pmu_buf *buf;
>> + int cpu = event->cpu;
>> + int ret;
>> +
>> + hwc->state = 0;
>> +
>> + /* Serialize the perf process if user specified several CPUs */
>> + spin_lock(&hisi_ptt->pmu_lock);
>> + if (hisi_ptt->trace_ctrl.started) {
>> + dev_dbg(dev, "trace has already started\n");
>> + goto stop;
>> + }
>> +
>> + /*
>> + * Handle the interrupt on the same cpu which starts the trace to avoid
>> + * context mismatch. Otherwise we'll trigger the WARN from the perf
>> + * core in event_function_local().
>> + */
>> + WARN_ON(irq_set_affinity(pci_irq_vector(hisi_ptt->pdev, HISI_PTT_TRACE_DMA_IRQ),
>> + cpumask_of(cpu)));
>> + hisi_ptt->trace_ctrl.on_cpu = cpu;
>> +
>> + buf = perf_aux_output_begin(handle, event);
>> + if (!buf) {
>> + dev_dbg(dev, "aux output begin failed\n");
>> + goto stop;
>> + }
>> +
>> + buf->pos = handle->head % buf->length;
>> +
>> + hisi_ptt_pmu_init_configs(hisi_ptt, event);
>> +
>> + ret = hisi_ptt_trace_start(hisi_ptt);
>> + if (ret) {
>> + dev_dbg(dev, "trace start failed, ret = %d\n", ret);
>> + perf_aux_output_end(handle, 0);
>> + goto stop;
>> + }
>> +
>> + spin_unlock(&hisi_ptt->pmu_lock);
>> + return;
>> +stop:
>> + event->hw.state |= PERF_HES_STOPPED;
>> + spin_unlock(&hisi_ptt->pmu_lock);
>> +}
>> +
>> +static void hisi_ptt_pmu_stop(struct perf_event *event, int flags)
>> +{
>> + struct hisi_ptt *hisi_ptt = to_hisi_ptt(event->pmu);
>> + struct hw_perf_event *hwc = &event->hw;
>> +
>> + if (hwc->state & PERF_HES_STOPPED)
>> + return;
>> +
>> + spin_lock(&hisi_ptt->pmu_lock);
>> + if (hisi_ptt->trace_ctrl.started) {
>> + hisi_ptt_trace_end(hisi_ptt);
>> + WARN(!hisi_ptt_wait_trace_hw_idle(hisi_ptt), "Device is still busy");
>> + hisi_ptt_update_aux(hisi_ptt, hisi_ptt->trace_ctrl.buf_index, true);
>> + }
>> + spin_unlock(&hisi_ptt->pmu_lock);
>> +
>> + hwc->state |= PERF_HES_STOPPED;
>> + perf_event_update_userpage(event);
>> + hwc->state |= PERF_HES_UPTODATE;
>> +}
>> +
>> +static int hisi_ptt_pmu_add(struct perf_event *event, int flags)
>> +{
>> + struct hisi_ptt *hisi_ptt = to_hisi_ptt(event->pmu);
>> + struct hw_perf_event *hwc = &event->hw;
>> + int cpu = event->cpu;
>> +
>> + /* Only allow the cpus on the device's node to add the event */
>> + if (!cpumask_test_cpu(cpu, cpumask_of_node(dev_to_node(&hisi_ptt->pdev->dev))))
>> + return 0;
>> +
>> + hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE;
>> +
>> + if (flags & PERF_EF_START) {
>> + hisi_ptt_pmu_start(event, PERF_EF_RELOAD);
>> + if (hwc->state & PERF_HES_STOPPED)
>> + return -EINVAL;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static void hisi_ptt_pmu_del(struct perf_event *event, int flags)
>> +{
>> + hisi_ptt_pmu_stop(event, PERF_EF_UPDATE);
>> +}
>> +
>> +static void hisi_ptt_remove_cpuhp_instance(void *hotplug_node)
>> +{
>> + cpuhp_state_remove_instance(hisi_ptt_pmu_online, hotplug_node);
>> +}
>> +
>> +static void hisi_ptt_unregister_pmu(void *pmu)
>> +{
>> + perf_pmu_unregister(pmu);
>> +}
>> +
>> +static int hisi_ptt_register_pmu(struct hisi_ptt *hisi_ptt)
>> +{
>> + u16 core_id, sicl_id;
>> + char *pmu_name;
>> + u32 reg;
>> + int ret;
>> +
>> + ret = cpuhp_state_add_instance(hisi_ptt_pmu_online, &hisi_ptt->hotplug_node);
>> + if (ret)
>> + return ret;
>> +
>> + ret = devm_add_action_or_reset(&hisi_ptt->pdev->dev,
>> + hisi_ptt_remove_cpuhp_instance,
>> + &hisi_ptt->hotplug_node);
>> + if (ret)
>> + return ret;
>> +
>> + spin_lock_init(&hisi_ptt->pmu_lock);
>> +
>> + hisi_ptt->hisi_ptt_pmu = (struct pmu) {
>> + .module = THIS_MODULE,
>> + .capabilities = PERF_PMU_CAP_EXCLUSIVE | PERF_PMU_CAP_ITRACE,
>> + .task_ctx_nr = perf_sw_context,
>> + .attr_groups = hisi_ptt_pmu_groups,
>> + .event_init = hisi_ptt_pmu_event_init,
>> + .setup_aux = hisi_ptt_pmu_setup_aux,
>> + .free_aux = hisi_ptt_pmu_free_aux,
>> + .start = hisi_ptt_pmu_start,
>> + .stop = hisi_ptt_pmu_stop,
>> + .add = hisi_ptt_pmu_add,
>> + .del = hisi_ptt_pmu_del,
>> + };
>> +
>> + reg = readl(hisi_ptt->iobase + HISI_PTT_LOCATION);
>> + core_id = FIELD_GET(HISI_PTT_CORE_ID, reg);
>> + sicl_id = FIELD_GET(HISI_PTT_SICL_ID, reg);
>> +
>> + pmu_name = devm_kasprintf(&hisi_ptt->pdev->dev, GFP_KERNEL, "hisi_ptt%u_%u",
>> + sicl_id, core_id);
>> + if (!pmu_name)
>> + return -ENOMEM;
>> +
>> + ret = perf_pmu_register(&hisi_ptt->hisi_ptt_pmu, pmu_name, -1);
>> + if (ret)
>> + return ret;
>> +
>> + return devm_add_action_or_reset(&hisi_ptt->pdev->dev,
>> + hisi_ptt_unregister_pmu,
>> + &hisi_ptt->hisi_ptt_pmu);
>> +}
>> +
>> +/*
>> + * The DMA of PTT trace can only use direct mappings due to some
>> + * hardware restriction. Check whether there is no IOMMU or the
>> + * policy of the IOMMU domain is passthrough, otherwise the trace
>> + * cannot work.
>> + *
>> + * The PTT device is supposed to behind an ARM SMMUv3, which
>> + * should have passthrough the device by a quirk.
>> + */
>> +static int hisi_ptt_check_iommu_mapping(struct pci_dev *pdev)
>> +{
>> + struct iommu_domain *iommu_domain;
>> +
>> + iommu_domain = iommu_get_domain_for_dev(&pdev->dev);
>> + if (!iommu_domain || iommu_domain->type == IOMMU_DOMAIN_IDENTITY)
>> + return 0;
>> +
>> + return -EOPNOTSUPP;
>> +}
>> +
>> +static int hisi_ptt_probe(struct pci_dev *pdev,
>> + const struct pci_device_id *id)
>> +{
>> + struct hisi_ptt *hisi_ptt;
>> + int ret;
>> +
>> + ret = hisi_ptt_check_iommu_mapping(pdev);
>> + if (ret) {
>> + pci_err(pdev, "requires direct DMA mappings\n");
>> + return ret;
>> + }
>> +
>> + hisi_ptt = devm_kzalloc(&pdev->dev, sizeof(*hisi_ptt), GFP_KERNEL);
>> + if (!hisi_ptt)
>> + return -ENOMEM;
>> +
>> + hisi_ptt->pdev = pdev;
>> + pci_set_drvdata(pdev, hisi_ptt);
>> +
>> + ret = pcim_enable_device(pdev);
>> + if (ret) {
>> + pci_err(pdev, "failed to enable device, ret = %d\n", ret);
>> + return ret;
>> + }
>> +
>> + ret = pcim_iomap_regions(pdev, BIT(2), DRV_NAME);
>> + if (ret) {
>> + pci_err(pdev, "failed to remap io memory, ret = %d\n", ret);
>> + return ret;
>> + }
>> +
>> + hisi_ptt->iobase = pcim_iomap_table(pdev)[2];
>> +
>> + ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
>> + if (ret) {
>> + pci_err(pdev, "failed to set 64 bit dma mask, ret = %d\n", ret);
>> + return ret;
>> + }
>> +
>> + pci_set_master(pdev);
>> +
>> + ret = hisi_ptt_register_irq(hisi_ptt);
>> + if (ret)
>> + return ret;
>> +
>> + ret = hisi_ptt_init_ctrls(hisi_ptt);
>> + if (ret) {
>> + pci_err(pdev, "failed to init controls, ret = %d\n", ret);
>> + return ret;
>> + }
>> +
>> + ret = hisi_ptt_register_pmu(hisi_ptt);
>> + if (ret) {
>> + pci_err(pdev, "failed to register PMU device, ret = %d", ret);
>> + return ret;
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +static const struct pci_device_id hisi_ptt_id_tbl[] = {
>> + { PCI_DEVICE(PCI_VENDOR_ID_HUAWEI, 0xa12e) },
>> + { }
>> +};
>> +MODULE_DEVICE_TABLE(pci, hisi_ptt_id_tbl);
>> +
>> +static struct pci_driver hisi_ptt_driver = {
>> + .name = DRV_NAME,
>> + .id_table = hisi_ptt_id_tbl,
>> + .probe = hisi_ptt_probe,
>> +};
>> +
>> +static int hisi_ptt_cpu_teardown(unsigned int cpu, struct hlist_node *node)
>> +{
>> + struct hisi_ptt *hisi_ptt;
>> + int target, src;
>> +
>> + hisi_ptt = hlist_entry_safe(node, struct hisi_ptt, hotplug_node);
>> + src = hisi_ptt->trace_ctrl.on_cpu;
>> +
>> + if (!hisi_ptt->trace_ctrl.started || src != cpu)
>> + return 0;
>> +
>> + target = cpumask_any(cpumask_of_node(dev_to_node(&hisi_ptt->pdev->dev)));
>> + if (target >= nr_cpu_ids) {
>> + dev_err(hisi_ptt->hisi_ptt_pmu.dev,
>> + "no available cpu for perf context migration\n");
>> + return 0;
>> + }
>> +
>> + perf_pmu_migrate_context(&hisi_ptt->hisi_ptt_pmu, src, target);
>> + WARN_ON(irq_set_affinity(pci_irq_vector(hisi_ptt->pdev, HISI_PTT_TRACE_DMA_IRQ),
>> + cpumask_of(cpu)));
>> + hisi_ptt->trace_ctrl.on_cpu = target;
>> +
>> + return 0;
>> +}
>> +
>> +static int __init hisi_ptt_init(void)
>> +{
>> + int ret;
>> +
>> + ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, DRV_NAME, NULL,
>> + hisi_ptt_cpu_teardown);
>> + if (ret < 0)
>> + return ret;
>> + hisi_ptt_pmu_online = ret;
>> +
>> + ret = pci_register_driver(&hisi_ptt_driver);
>> + if (ret)
>> + cpuhp_remove_multi_state(hisi_ptt_pmu_online);
>> +
>> + return ret;
>> +}
>> +module_init(hisi_ptt_init);
>> +
>> +static void __exit hisi_ptt_exit(void)
>> +{
>> + pci_unregister_driver(&hisi_ptt_driver);
>> + cpuhp_remove_multi_state(hisi_ptt_pmu_online);
>> +}
>> +module_exit(hisi_ptt_exit);
>> +
>> +MODULE_LICENSE("GPL");
>> +MODULE_AUTHOR("Yicong Yang <yangyicong@hisilicon.com>");
>> +MODULE_DESCRIPTION("Driver for HiSilicon PCIe tune and trace device");
>> diff --git a/drivers/hwtracing/ptt/hisi_ptt.h b/drivers/hwtracing/ptt/hisi_ptt.h
>> new file mode 100644
>> index 000000000000..43b2fe77a770
>> --- /dev/null
>> +++ b/drivers/hwtracing/ptt/hisi_ptt.h
>> @@ -0,0 +1,177 @@
>> +/* 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/list.h>
>> +#include <linux/pci.h>
>> +#include <linux/perf_event.h>
>> +#include <linux/spinlock.h>
>> +#include <linux/types.h>
>> +
>> +#define DRV_NAME "hisi_ptt"
>> +
>> +/*
>> + * The definition of the device registers and register fields.
>> + */
>> +#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_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_TRACE_TIMEOUT_US 100UL
>> +#define HISI_PTT_WAIT_POLL_INTERVAL_US 10UL
>> +
>> +#define HISI_PCIE_CORE_PORT_ID(devfn) (PCI_FUNC(devfn) << 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_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;
>> +};
>> +
>> +/**
>> + * struct hisi_ptt_filter_desc - Descriptor of the PTT trace filter
>> + * @list: entry of this descriptor in the filter list
>> + * @is_port: the PCI device of the filter is a Root Port or not
>> + * @devid: the PCI device's devid of the filter
>> + */
>> +struct hisi_ptt_filter_desc {
>> + struct list_head list;
>> + bool is_port;
>> + 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
>> + * @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
>> + * @pmu_lock: lock to serialize the perf process
>> + * @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
>> + * @port_mask: port mask of the managed root ports
>> + */
>> +struct hisi_ptt {
>> + struct hisi_ptt_trace_ctrl trace_ctrl;
>> + struct hlist_node hotplug_node;
>> + struct pmu hisi_ptt_pmu;
>> + void __iomem *iobase;
>> + struct pci_dev *pdev;
>> + spinlock_t pmu_lock;
>> + 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;
>> + u16 port_mask;
>> +};
>> +
>> +#define to_hisi_ptt(pmu) container_of(pmu, struct hisi_ptt, hisi_ptt_pmu)
>> +
>> +#endif /* _HISI_PTT_H */
>> --
>> 2.24.0
> .
>

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