1 // SPDX-License-Identifier: GPL-2.0
3 * Driver for HiSilicon PCIe tune and trace device
5 * Copyright (c) 2022 HiSilicon Technologies Co., Ltd.
6 * Author: Yicong Yang <yangyicong@hisilicon.com>
9 #include <linux/bitfield.h>
10 #include <linux/bitops.h>
11 #include <linux/cpuhotplug.h>
12 #include <linux/delay.h>
13 #include <linux/dma-mapping.h>
14 #include <linux/interrupt.h>
16 #include <linux/iommu.h>
17 #include <linux/iopoll.h>
18 #include <linux/module.h>
19 #include <linux/sysfs.h>
20 #include <linux/vmalloc.h>
24 /* Dynamic CPU hotplug state used by PTT */
25 static enum cpuhp_state hisi_ptt_pmu_online;
27 static bool hisi_ptt_wait_tuning_finish(struct hisi_ptt *hisi_ptt)
31 return !readl_poll_timeout(hisi_ptt->iobase + HISI_PTT_TUNING_INT_STAT,
32 val, !(val & HISI_PTT_TUNING_INT_STAT_MASK),
33 HISI_PTT_WAIT_POLL_INTERVAL_US,
34 HISI_PTT_WAIT_TUNE_TIMEOUT_US);
37 static ssize_t hisi_ptt_tune_attr_show(struct device *dev,
38 struct device_attribute *attr,
41 struct hisi_ptt *hisi_ptt = to_hisi_ptt(dev_get_drvdata(dev));
42 struct dev_ext_attribute *ext_attr;
43 struct hisi_ptt_tune_desc *desc;
47 ext_attr = container_of(attr, struct dev_ext_attribute, attr);
50 mutex_lock(&hisi_ptt->tune_lock);
52 reg = readl(hisi_ptt->iobase + HISI_PTT_TUNING_CTRL);
53 reg &= ~(HISI_PTT_TUNING_CTRL_CODE | HISI_PTT_TUNING_CTRL_SUB);
54 reg |= FIELD_PREP(HISI_PTT_TUNING_CTRL_CODE | HISI_PTT_TUNING_CTRL_SUB,
56 writel(reg, hisi_ptt->iobase + HISI_PTT_TUNING_CTRL);
58 /* Write all 1 to indicates it's the read process */
59 writel(~0U, hisi_ptt->iobase + HISI_PTT_TUNING_DATA);
61 if (!hisi_ptt_wait_tuning_finish(hisi_ptt)) {
62 mutex_unlock(&hisi_ptt->tune_lock);
66 reg = readl(hisi_ptt->iobase + HISI_PTT_TUNING_DATA);
67 reg &= HISI_PTT_TUNING_DATA_VAL_MASK;
68 val = FIELD_GET(HISI_PTT_TUNING_DATA_VAL_MASK, reg);
70 mutex_unlock(&hisi_ptt->tune_lock);
71 return sysfs_emit(buf, "%u\n", val);
74 static ssize_t hisi_ptt_tune_attr_store(struct device *dev,
75 struct device_attribute *attr,
76 const char *buf, size_t count)
78 struct hisi_ptt *hisi_ptt = to_hisi_ptt(dev_get_drvdata(dev));
79 struct dev_ext_attribute *ext_attr;
80 struct hisi_ptt_tune_desc *desc;
84 ext_attr = container_of(attr, struct dev_ext_attribute, attr);
87 if (kstrtou16(buf, 10, &val))
90 mutex_lock(&hisi_ptt->tune_lock);
92 reg = readl(hisi_ptt->iobase + HISI_PTT_TUNING_CTRL);
93 reg &= ~(HISI_PTT_TUNING_CTRL_CODE | HISI_PTT_TUNING_CTRL_SUB);
94 reg |= FIELD_PREP(HISI_PTT_TUNING_CTRL_CODE | HISI_PTT_TUNING_CTRL_SUB,
96 writel(reg, hisi_ptt->iobase + HISI_PTT_TUNING_CTRL);
97 writel(FIELD_PREP(HISI_PTT_TUNING_DATA_VAL_MASK, val),
98 hisi_ptt->iobase + HISI_PTT_TUNING_DATA);
100 if (!hisi_ptt_wait_tuning_finish(hisi_ptt)) {
101 mutex_unlock(&hisi_ptt->tune_lock);
105 mutex_unlock(&hisi_ptt->tune_lock);
109 #define HISI_PTT_TUNE_ATTR(_name, _val, _show, _store) \
110 static struct hisi_ptt_tune_desc _name##_desc = { \
112 .event_code = (_val), \
114 static struct dev_ext_attribute hisi_ptt_##_name##_attr = { \
115 .attr = __ATTR(_name, 0600, _show, _store), \
116 .var = &_name##_desc, \
119 #define HISI_PTT_TUNE_ATTR_COMMON(_name, _val) \
120 HISI_PTT_TUNE_ATTR(_name, _val, \
121 hisi_ptt_tune_attr_show, \
122 hisi_ptt_tune_attr_store)
125 * The value of the tuning event are composed of two parts: main event code
126 * in BIT[0,15] and subevent code in BIT[16,23]. For example, qox_tx_cpl is
127 * a subevent of 'Tx path QoS control' which for tuning the weight of Tx
128 * completion TLPs. See hisi_ptt.rst documentation for more information.
130 #define HISI_PTT_TUNE_QOS_TX_CPL (0x4 | (3 << 16))
131 #define HISI_PTT_TUNE_QOS_TX_NP (0x4 | (4 << 16))
132 #define HISI_PTT_TUNE_QOS_TX_P (0x4 | (5 << 16))
133 #define HISI_PTT_TUNE_RX_ALLOC_BUF_LEVEL (0x5 | (6 << 16))
134 #define HISI_PTT_TUNE_TX_ALLOC_BUF_LEVEL (0x5 | (7 << 16))
136 HISI_PTT_TUNE_ATTR_COMMON(qos_tx_cpl, HISI_PTT_TUNE_QOS_TX_CPL);
137 HISI_PTT_TUNE_ATTR_COMMON(qos_tx_np, HISI_PTT_TUNE_QOS_TX_NP);
138 HISI_PTT_TUNE_ATTR_COMMON(qos_tx_p, HISI_PTT_TUNE_QOS_TX_P);
139 HISI_PTT_TUNE_ATTR_COMMON(rx_alloc_buf_level, HISI_PTT_TUNE_RX_ALLOC_BUF_LEVEL);
140 HISI_PTT_TUNE_ATTR_COMMON(tx_alloc_buf_level, HISI_PTT_TUNE_TX_ALLOC_BUF_LEVEL);
142 static struct attribute *hisi_ptt_tune_attrs[] = {
143 &hisi_ptt_qos_tx_cpl_attr.attr.attr,
144 &hisi_ptt_qos_tx_np_attr.attr.attr,
145 &hisi_ptt_qos_tx_p_attr.attr.attr,
146 &hisi_ptt_rx_alloc_buf_level_attr.attr.attr,
147 &hisi_ptt_tx_alloc_buf_level_attr.attr.attr,
151 static struct attribute_group hisi_ptt_tune_group = {
153 .attrs = hisi_ptt_tune_attrs,
156 static u16 hisi_ptt_get_filter_val(u16 devid, bool is_port)
159 return BIT(HISI_PCIE_CORE_PORT_ID(devid & 0xff));
164 static bool hisi_ptt_wait_trace_hw_idle(struct hisi_ptt *hisi_ptt)
168 return !readl_poll_timeout_atomic(hisi_ptt->iobase + HISI_PTT_TRACE_STS,
169 val, val & HISI_PTT_TRACE_IDLE,
170 HISI_PTT_WAIT_POLL_INTERVAL_US,
171 HISI_PTT_WAIT_TRACE_TIMEOUT_US);
174 static void hisi_ptt_wait_dma_reset_done(struct hisi_ptt *hisi_ptt)
178 readl_poll_timeout_atomic(hisi_ptt->iobase + HISI_PTT_TRACE_WR_STS,
179 val, !val, HISI_PTT_RESET_POLL_INTERVAL_US,
180 HISI_PTT_RESET_TIMEOUT_US);
183 static void hisi_ptt_trace_end(struct hisi_ptt *hisi_ptt)
185 writel(0, hisi_ptt->iobase + HISI_PTT_TRACE_CTRL);
186 hisi_ptt->trace_ctrl.started = false;
189 static int hisi_ptt_trace_start(struct hisi_ptt *hisi_ptt)
191 struct hisi_ptt_trace_ctrl *ctrl = &hisi_ptt->trace_ctrl;
195 /* Check device idle before start trace */
196 if (!hisi_ptt_wait_trace_hw_idle(hisi_ptt)) {
197 pci_err(hisi_ptt->pdev, "Failed to start trace, the device is still busy\n");
201 ctrl->started = true;
203 /* Reset the DMA before start tracing */
204 val = readl(hisi_ptt->iobase + HISI_PTT_TRACE_CTRL);
205 val |= HISI_PTT_TRACE_CTRL_RST;
206 writel(val, hisi_ptt->iobase + HISI_PTT_TRACE_CTRL);
208 hisi_ptt_wait_dma_reset_done(hisi_ptt);
210 val = readl(hisi_ptt->iobase + HISI_PTT_TRACE_CTRL);
211 val &= ~HISI_PTT_TRACE_CTRL_RST;
212 writel(val, hisi_ptt->iobase + HISI_PTT_TRACE_CTRL);
214 /* Reset the index of current buffer */
215 hisi_ptt->trace_ctrl.buf_index = 0;
217 /* Zero the trace buffers */
218 for (i = 0; i < HISI_PTT_TRACE_BUF_CNT; i++)
219 memset(ctrl->trace_buf[i].addr, 0, HISI_PTT_TRACE_BUF_SIZE);
221 /* Clear the interrupt status */
222 writel(HISI_PTT_TRACE_INT_STAT_MASK, hisi_ptt->iobase + HISI_PTT_TRACE_INT_STAT);
223 writel(0, hisi_ptt->iobase + HISI_PTT_TRACE_INT_MASK);
225 /* Set the trace control register */
226 val = FIELD_PREP(HISI_PTT_TRACE_CTRL_TYPE_SEL, ctrl->type);
227 val |= FIELD_PREP(HISI_PTT_TRACE_CTRL_RXTX_SEL, ctrl->direction);
228 val |= FIELD_PREP(HISI_PTT_TRACE_CTRL_DATA_FORMAT, ctrl->format);
229 val |= FIELD_PREP(HISI_PTT_TRACE_CTRL_TARGET_SEL, hisi_ptt->trace_ctrl.filter);
230 if (!hisi_ptt->trace_ctrl.is_port)
231 val |= HISI_PTT_TRACE_CTRL_FILTER_MODE;
233 /* Start the Trace */
234 val |= HISI_PTT_TRACE_CTRL_EN;
235 writel(val, hisi_ptt->iobase + HISI_PTT_TRACE_CTRL);
240 static int hisi_ptt_update_aux(struct hisi_ptt *hisi_ptt, int index, bool stop)
242 struct hisi_ptt_trace_ctrl *ctrl = &hisi_ptt->trace_ctrl;
243 struct perf_output_handle *handle = &ctrl->handle;
244 struct perf_event *event = handle->event;
245 struct hisi_ptt_pmu_buf *buf;
249 buf = perf_get_aux(handle);
250 if (!buf || !handle->size)
253 addr = ctrl->trace_buf[ctrl->buf_index].addr;
256 * If we're going to stop, read the size of already traced data from
257 * HISI_PTT_TRACE_WR_STS. Otherwise we're coming from the interrupt,
258 * the data size is always HISI_PTT_TRACE_BUF_SIZE.
263 reg = readl(hisi_ptt->iobase + HISI_PTT_TRACE_WR_STS);
264 size = FIELD_GET(HISI_PTT_TRACE_WR_STS_WRITE, reg);
266 size = HISI_PTT_TRACE_BUF_SIZE;
269 memcpy(buf->base + buf->pos, addr, size);
273 * Just commit the traced data if we're going to stop. Otherwise if the
274 * resident AUX buffer cannot contain the data of next trace buffer,
278 perf_aux_output_end(handle, buf->pos);
279 } else if (buf->length - buf->pos < HISI_PTT_TRACE_BUF_SIZE) {
280 perf_aux_output_end(handle, buf->pos);
282 buf = perf_aux_output_begin(handle, event);
286 buf->pos = handle->head % buf->length;
287 if (buf->length - buf->pos < HISI_PTT_TRACE_BUF_SIZE) {
288 perf_aux_output_end(handle, 0);
296 static irqreturn_t hisi_ptt_isr(int irq, void *context)
298 struct hisi_ptt *hisi_ptt = context;
301 status = readl(hisi_ptt->iobase + HISI_PTT_TRACE_INT_STAT);
302 if (!(status & HISI_PTT_TRACE_INT_STAT_MASK))
305 buf_idx = ffs(status) - 1;
307 /* Clear the interrupt status of buffer @buf_idx */
308 writel(status, hisi_ptt->iobase + HISI_PTT_TRACE_INT_STAT);
311 * Update the AUX buffer and cache the current buffer index,
312 * as we need to know this and save the data when the trace
313 * is ended out of the interrupt handler. End the trace
314 * if the updating fails.
316 if (hisi_ptt_update_aux(hisi_ptt, buf_idx, false))
317 hisi_ptt_trace_end(hisi_ptt);
319 hisi_ptt->trace_ctrl.buf_index = (buf_idx + 1) % HISI_PTT_TRACE_BUF_CNT;
324 static void hisi_ptt_irq_free_vectors(void *pdev)
326 pci_free_irq_vectors(pdev);
329 static int hisi_ptt_register_irq(struct hisi_ptt *hisi_ptt)
331 struct pci_dev *pdev = hisi_ptt->pdev;
334 ret = pci_alloc_irq_vectors(pdev, 1, 1, PCI_IRQ_MSI);
336 pci_err(pdev, "failed to allocate irq vector, ret = %d\n", ret);
340 ret = devm_add_action_or_reset(&pdev->dev, hisi_ptt_irq_free_vectors, pdev);
344 hisi_ptt->trace_irq = pci_irq_vector(pdev, HISI_PTT_TRACE_DMA_IRQ);
345 ret = devm_request_irq(&pdev->dev, hisi_ptt->trace_irq, hisi_ptt_isr,
346 IRQF_NOBALANCING | IRQF_NO_THREAD, DRV_NAME,
349 pci_err(pdev, "failed to request irq %d, ret = %d\n",
350 hisi_ptt->trace_irq, ret);
357 static void hisi_ptt_del_free_filter(struct hisi_ptt *hisi_ptt,
358 struct hisi_ptt_filter_desc *filter)
361 hisi_ptt->port_mask &= ~hisi_ptt_get_filter_val(filter->devid, true);
363 list_del(&filter->list);
368 static struct hisi_ptt_filter_desc *
369 hisi_ptt_alloc_add_filter(struct hisi_ptt *hisi_ptt, u16 devid, bool is_port)
371 struct hisi_ptt_filter_desc *filter;
372 u8 devfn = devid & 0xff;
375 filter_name = kasprintf(GFP_KERNEL, "%04x:%02x:%02x.%d", pci_domain_nr(hisi_ptt->pdev->bus),
376 PCI_BUS_NUM(devid), PCI_SLOT(devfn), PCI_FUNC(devfn));
378 pci_err(hisi_ptt->pdev, "failed to allocate name for filter %04x:%02x:%02x.%d\n",
379 pci_domain_nr(hisi_ptt->pdev->bus), PCI_BUS_NUM(devid),
380 PCI_SLOT(devfn), PCI_FUNC(devfn));
384 filter = kzalloc(sizeof(*filter), GFP_KERNEL);
386 pci_err(hisi_ptt->pdev, "failed to add filter for %s\n",
392 filter->name = filter_name;
393 filter->is_port = is_port;
394 filter->devid = devid;
396 if (filter->is_port) {
397 list_add_tail(&filter->list, &hisi_ptt->port_filters);
399 /* Update the available port mask */
400 hisi_ptt->port_mask |= hisi_ptt_get_filter_val(filter->devid, true);
402 list_add_tail(&filter->list, &hisi_ptt->req_filters);
408 static ssize_t hisi_ptt_filter_show(struct device *dev, struct device_attribute *attr,
411 struct hisi_ptt_filter_desc *filter;
412 unsigned long filter_val;
414 filter = container_of(attr, struct hisi_ptt_filter_desc, attr);
415 filter_val = hisi_ptt_get_filter_val(filter->devid, filter->is_port) |
416 (filter->is_port ? HISI_PTT_PMU_FILTER_IS_PORT : 0);
418 return sysfs_emit(buf, "0x%05lx\n", filter_val);
421 static int hisi_ptt_create_rp_filter_attr(struct hisi_ptt *hisi_ptt,
422 struct hisi_ptt_filter_desc *filter)
424 struct kobject *kobj = &hisi_ptt->hisi_ptt_pmu.dev->kobj;
426 sysfs_attr_init(&filter->attr.attr);
427 filter->attr.attr.name = filter->name;
428 filter->attr.attr.mode = 0400; /* DEVICE_ATTR_ADMIN_RO */
429 filter->attr.show = hisi_ptt_filter_show;
431 return sysfs_add_file_to_group(kobj, &filter->attr.attr,
432 HISI_PTT_RP_FILTERS_GRP_NAME);
435 static void hisi_ptt_remove_rp_filter_attr(struct hisi_ptt *hisi_ptt,
436 struct hisi_ptt_filter_desc *filter)
438 struct kobject *kobj = &hisi_ptt->hisi_ptt_pmu.dev->kobj;
440 sysfs_remove_file_from_group(kobj, &filter->attr.attr,
441 HISI_PTT_RP_FILTERS_GRP_NAME);
444 static int hisi_ptt_create_req_filter_attr(struct hisi_ptt *hisi_ptt,
445 struct hisi_ptt_filter_desc *filter)
447 struct kobject *kobj = &hisi_ptt->hisi_ptt_pmu.dev->kobj;
449 sysfs_attr_init(&filter->attr.attr);
450 filter->attr.attr.name = filter->name;
451 filter->attr.attr.mode = 0400; /* DEVICE_ATTR_ADMIN_RO */
452 filter->attr.show = hisi_ptt_filter_show;
454 return sysfs_add_file_to_group(kobj, &filter->attr.attr,
455 HISI_PTT_REQ_FILTERS_GRP_NAME);
458 static void hisi_ptt_remove_req_filter_attr(struct hisi_ptt *hisi_ptt,
459 struct hisi_ptt_filter_desc *filter)
461 struct kobject *kobj = &hisi_ptt->hisi_ptt_pmu.dev->kobj;
463 sysfs_remove_file_from_group(kobj, &filter->attr.attr,
464 HISI_PTT_REQ_FILTERS_GRP_NAME);
467 static int hisi_ptt_create_filter_attr(struct hisi_ptt *hisi_ptt,
468 struct hisi_ptt_filter_desc *filter)
473 ret = hisi_ptt_create_rp_filter_attr(hisi_ptt, filter);
475 ret = hisi_ptt_create_req_filter_attr(hisi_ptt, filter);
478 pci_err(hisi_ptt->pdev, "failed to create sysfs attribute for filter %s\n",
484 static void hisi_ptt_remove_filter_attr(struct hisi_ptt *hisi_ptt,
485 struct hisi_ptt_filter_desc *filter)
488 hisi_ptt_remove_rp_filter_attr(hisi_ptt, filter);
490 hisi_ptt_remove_req_filter_attr(hisi_ptt, filter);
493 static void hisi_ptt_remove_all_filter_attributes(void *data)
495 struct hisi_ptt_filter_desc *filter;
496 struct hisi_ptt *hisi_ptt = data;
498 mutex_lock(&hisi_ptt->filter_lock);
500 list_for_each_entry(filter, &hisi_ptt->req_filters, list)
501 hisi_ptt_remove_filter_attr(hisi_ptt, filter);
503 list_for_each_entry(filter, &hisi_ptt->port_filters, list)
504 hisi_ptt_remove_filter_attr(hisi_ptt, filter);
506 hisi_ptt->sysfs_inited = false;
507 mutex_unlock(&hisi_ptt->filter_lock);
510 static int hisi_ptt_init_filter_attributes(struct hisi_ptt *hisi_ptt)
512 struct hisi_ptt_filter_desc *filter;
515 mutex_lock(&hisi_ptt->filter_lock);
518 * Register the reset callback in the first stage. In reset we traverse
519 * the filters list to remove the sysfs attributes so the callback can
520 * be called safely even without below filter attributes creation.
522 ret = devm_add_action(&hisi_ptt->pdev->dev,
523 hisi_ptt_remove_all_filter_attributes,
528 list_for_each_entry(filter, &hisi_ptt->port_filters, list) {
529 ret = hisi_ptt_create_filter_attr(hisi_ptt, filter);
534 list_for_each_entry(filter, &hisi_ptt->req_filters, list) {
535 ret = hisi_ptt_create_filter_attr(hisi_ptt, filter);
540 hisi_ptt->sysfs_inited = true;
542 mutex_unlock(&hisi_ptt->filter_lock);
546 static void hisi_ptt_update_filters(struct work_struct *work)
548 struct delayed_work *delayed_work = to_delayed_work(work);
549 struct hisi_ptt_filter_update_info info;
550 struct hisi_ptt_filter_desc *filter;
551 struct hisi_ptt *hisi_ptt;
553 hisi_ptt = container_of(delayed_work, struct hisi_ptt, work);
555 if (!mutex_trylock(&hisi_ptt->filter_lock)) {
556 schedule_delayed_work(&hisi_ptt->work, HISI_PTT_WORK_DELAY_MS);
560 while (kfifo_get(&hisi_ptt->filter_update_kfifo, &info)) {
563 * Notify the users if failed to add this filter, others
564 * still work and available. See the comments in
565 * hisi_ptt_init_filters().
567 filter = hisi_ptt_alloc_add_filter(hisi_ptt, info.devid, info.is_port);
572 * If filters' sysfs entries hasn't been initialized,
573 * then we're still at probe stage. Add the filters to
574 * the list and later hisi_ptt_init_filter_attributes()
575 * will create sysfs attributes for all the filters.
577 if (hisi_ptt->sysfs_inited &&
578 hisi_ptt_create_filter_attr(hisi_ptt, filter)) {
579 hisi_ptt_del_free_filter(hisi_ptt, filter);
583 struct hisi_ptt_filter_desc *tmp;
584 struct list_head *target_list;
586 target_list = info.is_port ? &hisi_ptt->port_filters :
587 &hisi_ptt->req_filters;
589 list_for_each_entry_safe(filter, tmp, target_list, list)
590 if (filter->devid == info.devid) {
591 if (hisi_ptt->sysfs_inited)
592 hisi_ptt_remove_filter_attr(hisi_ptt, filter);
594 hisi_ptt_del_free_filter(hisi_ptt, filter);
600 mutex_unlock(&hisi_ptt->filter_lock);
604 * A PCI bus notifier is used here for dynamically updating the filter
607 static int hisi_ptt_notifier_call(struct notifier_block *nb, unsigned long action,
610 struct hisi_ptt *hisi_ptt = container_of(nb, struct hisi_ptt, hisi_ptt_nb);
611 struct hisi_ptt_filter_update_info info;
612 struct pci_dev *pdev, *root_port;
613 struct device *dev = data;
616 pdev = to_pci_dev(dev);
617 root_port = pcie_find_root_port(pdev);
621 port_devid = pci_dev_id(root_port);
622 if (port_devid < hisi_ptt->lower_bdf ||
623 port_devid > hisi_ptt->upper_bdf)
626 info.is_port = pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT;
627 info.devid = pci_dev_id(pdev);
630 case BUS_NOTIFY_ADD_DEVICE:
633 case BUS_NOTIFY_DEL_DEVICE:
641 * The FIFO size is 16 which is sufficient for almost all the cases,
642 * since each PCIe core will have most 8 Root Ports (typically only
643 * 1~4 Root Ports). On failure log the failed filter and let user
646 if (kfifo_in_spinlocked(&hisi_ptt->filter_update_kfifo, &info, 1,
647 &hisi_ptt->filter_update_lock))
648 schedule_delayed_work(&hisi_ptt->work, 0);
650 pci_warn(hisi_ptt->pdev,
651 "filter update fifo overflow for target %s\n",
657 static int hisi_ptt_init_filters(struct pci_dev *pdev, void *data)
659 struct pci_dev *root_port = pcie_find_root_port(pdev);
660 struct hisi_ptt_filter_desc *filter;
661 struct hisi_ptt *hisi_ptt = data;
667 port_devid = pci_dev_id(root_port);
668 if (port_devid < hisi_ptt->lower_bdf ||
669 port_devid > hisi_ptt->upper_bdf)
673 * We won't fail the probe if filter allocation failed here. The filters
674 * should be partial initialized and users would know which filter fails
675 * through the log. Other functions of PTT device are still available.
677 filter = hisi_ptt_alloc_add_filter(hisi_ptt, pci_dev_id(pdev),
678 pci_pcie_type(pdev) == PCI_EXP_TYPE_ROOT_PORT);
685 static void hisi_ptt_release_filters(void *data)
687 struct hisi_ptt_filter_desc *filter, *tmp;
688 struct hisi_ptt *hisi_ptt = data;
690 list_for_each_entry_safe(filter, tmp, &hisi_ptt->req_filters, list)
691 hisi_ptt_del_free_filter(hisi_ptt, filter);
693 list_for_each_entry_safe(filter, tmp, &hisi_ptt->port_filters, list)
694 hisi_ptt_del_free_filter(hisi_ptt, filter);
697 static int hisi_ptt_config_trace_buf(struct hisi_ptt *hisi_ptt)
699 struct hisi_ptt_trace_ctrl *ctrl = &hisi_ptt->trace_ctrl;
700 struct device *dev = &hisi_ptt->pdev->dev;
703 ctrl->trace_buf = devm_kcalloc(dev, HISI_PTT_TRACE_BUF_CNT,
704 sizeof(*ctrl->trace_buf), GFP_KERNEL);
705 if (!ctrl->trace_buf)
708 for (i = 0; i < HISI_PTT_TRACE_BUF_CNT; ++i) {
709 ctrl->trace_buf[i].addr = dmam_alloc_coherent(dev, HISI_PTT_TRACE_BUF_SIZE,
710 &ctrl->trace_buf[i].dma,
712 if (!ctrl->trace_buf[i].addr)
716 /* Configure the trace DMA buffer */
717 for (i = 0; i < HISI_PTT_TRACE_BUF_CNT; i++) {
718 writel(lower_32_bits(ctrl->trace_buf[i].dma),
719 hisi_ptt->iobase + HISI_PTT_TRACE_ADDR_BASE_LO_0 +
720 i * HISI_PTT_TRACE_ADDR_STRIDE);
721 writel(upper_32_bits(ctrl->trace_buf[i].dma),
722 hisi_ptt->iobase + HISI_PTT_TRACE_ADDR_BASE_HI_0 +
723 i * HISI_PTT_TRACE_ADDR_STRIDE);
725 writel(HISI_PTT_TRACE_BUF_SIZE, hisi_ptt->iobase + HISI_PTT_TRACE_ADDR_SIZE);
730 static int hisi_ptt_init_ctrls(struct hisi_ptt *hisi_ptt)
732 struct pci_dev *pdev = hisi_ptt->pdev;
737 INIT_DELAYED_WORK(&hisi_ptt->work, hisi_ptt_update_filters);
738 INIT_KFIFO(hisi_ptt->filter_update_kfifo);
739 spin_lock_init(&hisi_ptt->filter_update_lock);
741 INIT_LIST_HEAD(&hisi_ptt->port_filters);
742 INIT_LIST_HEAD(&hisi_ptt->req_filters);
743 mutex_init(&hisi_ptt->filter_lock);
745 ret = hisi_ptt_config_trace_buf(hisi_ptt);
750 * The device range register provides the information about the root
751 * ports which the RCiEP can control and trace. The RCiEP and the root
752 * ports which it supports are on the same PCIe core, with same domain
753 * number but maybe different bus number. The device range register
754 * will tell us which root ports we can support, Bit[31:16] indicates
755 * the upper BDF numbers of the root port, while Bit[15:0] indicates
758 reg = readl(hisi_ptt->iobase + HISI_PTT_DEVICE_RANGE);
759 hisi_ptt->upper_bdf = FIELD_GET(HISI_PTT_DEVICE_RANGE_UPPER, reg);
760 hisi_ptt->lower_bdf = FIELD_GET(HISI_PTT_DEVICE_RANGE_LOWER, reg);
762 bus = pci_find_bus(pci_domain_nr(pdev->bus), PCI_BUS_NUM(hisi_ptt->upper_bdf));
764 pci_walk_bus(bus, hisi_ptt_init_filters, hisi_ptt);
766 ret = devm_add_action_or_reset(&pdev->dev, hisi_ptt_release_filters, hisi_ptt);
770 hisi_ptt->trace_ctrl.on_cpu = -1;
774 static ssize_t cpumask_show(struct device *dev, struct device_attribute *attr,
777 struct hisi_ptt *hisi_ptt = to_hisi_ptt(dev_get_drvdata(dev));
778 const cpumask_t *cpumask = cpumask_of_node(dev_to_node(&hisi_ptt->pdev->dev));
780 return cpumap_print_to_pagebuf(true, buf, cpumask);
782 static DEVICE_ATTR_RO(cpumask);
784 static struct attribute *hisi_ptt_cpumask_attrs[] = {
785 &dev_attr_cpumask.attr,
789 static const struct attribute_group hisi_ptt_cpumask_attr_group = {
790 .attrs = hisi_ptt_cpumask_attrs,
794 * Bit 19 indicates the filter type, 1 for Root Port filter and 0 for Requester
795 * filter. Bit[15:0] indicates the filter value, for Root Port filter it's
796 * a bit mask of desired ports and for Requester filter it's the Requester ID
797 * of the desired PCIe function. Bit[18:16] is reserved for extension.
799 * See hisi_ptt.rst documentation for detailed information.
801 PMU_FORMAT_ATTR(filter, "config:0-19");
802 PMU_FORMAT_ATTR(direction, "config:20-23");
803 PMU_FORMAT_ATTR(type, "config:24-31");
804 PMU_FORMAT_ATTR(format, "config:32-35");
806 static struct attribute *hisi_ptt_pmu_format_attrs[] = {
807 &format_attr_filter.attr,
808 &format_attr_direction.attr,
809 &format_attr_type.attr,
810 &format_attr_format.attr,
814 static struct attribute_group hisi_ptt_pmu_format_group = {
816 .attrs = hisi_ptt_pmu_format_attrs,
819 static ssize_t hisi_ptt_filter_multiselect_show(struct device *dev,
820 struct device_attribute *attr,
823 struct dev_ext_attribute *ext_attr;
825 ext_attr = container_of(attr, struct dev_ext_attribute, attr);
826 return sysfs_emit(buf, "%s\n", (char *)ext_attr->var);
829 static struct dev_ext_attribute root_port_filters_multiselect = {
831 .attr = { .name = "multiselect", .mode = 0400 },
832 .show = hisi_ptt_filter_multiselect_show,
837 static struct attribute *hisi_ptt_pmu_root_ports_attrs[] = {
838 &root_port_filters_multiselect.attr.attr,
842 static struct attribute_group hisi_ptt_pmu_root_ports_group = {
843 .name = HISI_PTT_RP_FILTERS_GRP_NAME,
844 .attrs = hisi_ptt_pmu_root_ports_attrs,
847 static struct dev_ext_attribute requester_filters_multiselect = {
849 .attr = { .name = "multiselect", .mode = 0400 },
850 .show = hisi_ptt_filter_multiselect_show,
855 static struct attribute *hisi_ptt_pmu_requesters_attrs[] = {
856 &requester_filters_multiselect.attr.attr,
860 static struct attribute_group hisi_ptt_pmu_requesters_group = {
861 .name = HISI_PTT_REQ_FILTERS_GRP_NAME,
862 .attrs = hisi_ptt_pmu_requesters_attrs,
865 static const struct attribute_group *hisi_ptt_pmu_groups[] = {
866 &hisi_ptt_cpumask_attr_group,
867 &hisi_ptt_pmu_format_group,
868 &hisi_ptt_tune_group,
869 &hisi_ptt_pmu_root_ports_group,
870 &hisi_ptt_pmu_requesters_group,
874 static int hisi_ptt_trace_valid_direction(u32 val)
877 * The direction values have different effects according to the data
878 * format (specified in the parentheses). TLP set A/B means different
879 * set of TLP types. See hisi_ptt.rst documentation for more details.
881 static const u32 hisi_ptt_trace_available_direction[] = {
882 0, /* inbound(4DW) or reserved(8DW) */
883 1, /* outbound(4DW) */
884 2, /* {in, out}bound(4DW) or inbound(8DW), TLP set A */
885 3, /* {in, out}bound(4DW) or inbound(8DW), TLP set B */
889 for (i = 0; i < ARRAY_SIZE(hisi_ptt_trace_available_direction); i++) {
890 if (val == hisi_ptt_trace_available_direction[i])
897 static int hisi_ptt_trace_valid_type(u32 val)
899 /* Different types can be set simultaneously */
900 static const u32 hisi_ptt_trace_available_type[] = {
901 1, /* posted_request */
902 2, /* non-posted_request */
911 * Walk the available list and clear the valid bits of
912 * the config. If there is any resident bit after the
913 * walk then the config is invalid.
915 for (i = 0; i < ARRAY_SIZE(hisi_ptt_trace_available_type); i++)
916 val &= ~hisi_ptt_trace_available_type[i];
924 static int hisi_ptt_trace_valid_format(u32 val)
926 static const u32 hisi_ptt_trace_availble_format[] = {
932 for (i = 0; i < ARRAY_SIZE(hisi_ptt_trace_availble_format); i++) {
933 if (val == hisi_ptt_trace_availble_format[i])
940 static int hisi_ptt_trace_valid_filter(struct hisi_ptt *hisi_ptt, u64 config)
942 unsigned long val, port_mask = hisi_ptt->port_mask;
943 struct hisi_ptt_filter_desc *filter;
946 hisi_ptt->trace_ctrl.is_port = FIELD_GET(HISI_PTT_PMU_FILTER_IS_PORT, config);
947 val = FIELD_GET(HISI_PTT_PMU_FILTER_VAL_MASK, config);
950 * Port filters are defined as bit mask. For port filters, check
951 * the bits in the @val are within the range of hisi_ptt->port_mask
952 * and whether it's empty or not, otherwise user has specified
953 * some unsupported root ports.
955 * For Requester ID filters, walk the available filter list to see
956 * whether we have one matched.
958 mutex_lock(&hisi_ptt->filter_lock);
959 if (!hisi_ptt->trace_ctrl.is_port) {
960 list_for_each_entry(filter, &hisi_ptt->req_filters, list) {
961 if (val == hisi_ptt_get_filter_val(filter->devid, filter->is_port))
964 } else if (bitmap_subset(&val, &port_mask, BITS_PER_LONG)) {
970 mutex_unlock(&hisi_ptt->filter_lock);
974 static void hisi_ptt_pmu_init_configs(struct hisi_ptt *hisi_ptt, struct perf_event *event)
976 struct hisi_ptt_trace_ctrl *ctrl = &hisi_ptt->trace_ctrl;
979 val = FIELD_GET(HISI_PTT_PMU_FILTER_VAL_MASK, event->attr.config);
980 hisi_ptt->trace_ctrl.filter = val;
982 val = FIELD_GET(HISI_PTT_PMU_DIRECTION_MASK, event->attr.config);
983 ctrl->direction = val;
985 val = FIELD_GET(HISI_PTT_PMU_TYPE_MASK, event->attr.config);
988 val = FIELD_GET(HISI_PTT_PMU_FORMAT_MASK, event->attr.config);
992 static int hisi_ptt_pmu_event_init(struct perf_event *event)
994 struct hisi_ptt *hisi_ptt = to_hisi_ptt(event->pmu);
998 if (event->cpu < 0) {
999 dev_dbg(event->pmu->dev, "Per-task mode not supported\n");
1003 if (event->attach_state & PERF_ATTACH_TASK)
1006 if (event->attr.type != hisi_ptt->hisi_ptt_pmu.type)
1009 ret = hisi_ptt_trace_valid_filter(hisi_ptt, event->attr.config);
1013 val = FIELD_GET(HISI_PTT_PMU_DIRECTION_MASK, event->attr.config);
1014 ret = hisi_ptt_trace_valid_direction(val);
1018 val = FIELD_GET(HISI_PTT_PMU_TYPE_MASK, event->attr.config);
1019 ret = hisi_ptt_trace_valid_type(val);
1023 val = FIELD_GET(HISI_PTT_PMU_FORMAT_MASK, event->attr.config);
1024 return hisi_ptt_trace_valid_format(val);
1027 static void *hisi_ptt_pmu_setup_aux(struct perf_event *event, void **pages,
1028 int nr_pages, bool overwrite)
1030 struct hisi_ptt_pmu_buf *buf;
1031 struct page **pagelist;
1035 dev_warn(event->pmu->dev, "Overwrite mode is not supported\n");
1039 /* If the pages size less than buffers, we cannot start trace */
1040 if (nr_pages < HISI_PTT_TRACE_TOTAL_BUF_SIZE / PAGE_SIZE)
1043 buf = kzalloc(sizeof(*buf), GFP_KERNEL);
1047 pagelist = kcalloc(nr_pages, sizeof(*pagelist), GFP_KERNEL);
1051 for (i = 0; i < nr_pages; i++)
1052 pagelist[i] = virt_to_page(pages[i]);
1054 buf->base = vmap(pagelist, nr_pages, VM_MAP, PAGE_KERNEL);
1060 buf->nr_pages = nr_pages;
1061 buf->length = nr_pages * PAGE_SIZE;
1071 static void hisi_ptt_pmu_free_aux(void *aux)
1073 struct hisi_ptt_pmu_buf *buf = aux;
1079 static void hisi_ptt_pmu_start(struct perf_event *event, int flags)
1081 struct hisi_ptt *hisi_ptt = to_hisi_ptt(event->pmu);
1082 struct perf_output_handle *handle = &hisi_ptt->trace_ctrl.handle;
1083 struct hw_perf_event *hwc = &event->hw;
1084 struct device *dev = event->pmu->dev;
1085 struct hisi_ptt_pmu_buf *buf;
1086 int cpu = event->cpu;
1091 /* Serialize the perf process if user specified several CPUs */
1092 spin_lock(&hisi_ptt->pmu_lock);
1093 if (hisi_ptt->trace_ctrl.started) {
1094 dev_dbg(dev, "trace has already started\n");
1099 * Handle the interrupt on the same cpu which starts the trace to avoid
1100 * context mismatch. Otherwise we'll trigger the WARN from the perf
1101 * core in event_function_local(). If CPU passed is offline we'll fail
1102 * here, just log it since we can do nothing here.
1104 ret = irq_set_affinity(hisi_ptt->trace_irq, cpumask_of(cpu));
1106 dev_warn(dev, "failed to set the affinity of trace interrupt\n");
1108 hisi_ptt->trace_ctrl.on_cpu = cpu;
1110 buf = perf_aux_output_begin(handle, event);
1112 dev_dbg(dev, "aux output begin failed\n");
1116 buf->pos = handle->head % buf->length;
1118 hisi_ptt_pmu_init_configs(hisi_ptt, event);
1120 ret = hisi_ptt_trace_start(hisi_ptt);
1122 dev_dbg(dev, "trace start failed, ret = %d\n", ret);
1123 perf_aux_output_end(handle, 0);
1127 spin_unlock(&hisi_ptt->pmu_lock);
1130 event->hw.state |= PERF_HES_STOPPED;
1131 spin_unlock(&hisi_ptt->pmu_lock);
1134 static void hisi_ptt_pmu_stop(struct perf_event *event, int flags)
1136 struct hisi_ptt *hisi_ptt = to_hisi_ptt(event->pmu);
1137 struct hw_perf_event *hwc = &event->hw;
1139 if (hwc->state & PERF_HES_STOPPED)
1142 spin_lock(&hisi_ptt->pmu_lock);
1143 if (hisi_ptt->trace_ctrl.started) {
1144 hisi_ptt_trace_end(hisi_ptt);
1146 if (!hisi_ptt_wait_trace_hw_idle(hisi_ptt))
1147 dev_warn(event->pmu->dev, "Device is still busy\n");
1149 hisi_ptt_update_aux(hisi_ptt, hisi_ptt->trace_ctrl.buf_index, true);
1151 spin_unlock(&hisi_ptt->pmu_lock);
1153 hwc->state |= PERF_HES_STOPPED;
1154 perf_event_update_userpage(event);
1155 hwc->state |= PERF_HES_UPTODATE;
1158 static int hisi_ptt_pmu_add(struct perf_event *event, int flags)
1160 struct hisi_ptt *hisi_ptt = to_hisi_ptt(event->pmu);
1161 struct hw_perf_event *hwc = &event->hw;
1162 int cpu = event->cpu;
1164 /* Only allow the cpus on the device's node to add the event */
1165 if (!cpumask_test_cpu(cpu, cpumask_of_node(dev_to_node(&hisi_ptt->pdev->dev))))
1168 hwc->state = PERF_HES_STOPPED | PERF_HES_UPTODATE;
1170 if (flags & PERF_EF_START) {
1171 hisi_ptt_pmu_start(event, PERF_EF_RELOAD);
1172 if (hwc->state & PERF_HES_STOPPED)
1179 static void hisi_ptt_pmu_del(struct perf_event *event, int flags)
1181 hisi_ptt_pmu_stop(event, PERF_EF_UPDATE);
1184 static void hisi_ptt_pmu_read(struct perf_event *event)
1188 static void hisi_ptt_remove_cpuhp_instance(void *hotplug_node)
1190 cpuhp_state_remove_instance_nocalls(hisi_ptt_pmu_online, hotplug_node);
1193 static void hisi_ptt_unregister_pmu(void *pmu)
1195 perf_pmu_unregister(pmu);
1198 static int hisi_ptt_register_pmu(struct hisi_ptt *hisi_ptt)
1200 u16 core_id, sicl_id;
1205 ret = cpuhp_state_add_instance_nocalls(hisi_ptt_pmu_online,
1206 &hisi_ptt->hotplug_node);
1210 ret = devm_add_action_or_reset(&hisi_ptt->pdev->dev,
1211 hisi_ptt_remove_cpuhp_instance,
1212 &hisi_ptt->hotplug_node);
1216 mutex_init(&hisi_ptt->tune_lock);
1217 spin_lock_init(&hisi_ptt->pmu_lock);
1219 hisi_ptt->hisi_ptt_pmu = (struct pmu) {
1220 .module = THIS_MODULE,
1221 .capabilities = PERF_PMU_CAP_EXCLUSIVE | PERF_PMU_CAP_NO_EXCLUDE,
1222 .task_ctx_nr = perf_sw_context,
1223 .attr_groups = hisi_ptt_pmu_groups,
1224 .event_init = hisi_ptt_pmu_event_init,
1225 .setup_aux = hisi_ptt_pmu_setup_aux,
1226 .free_aux = hisi_ptt_pmu_free_aux,
1227 .start = hisi_ptt_pmu_start,
1228 .stop = hisi_ptt_pmu_stop,
1229 .add = hisi_ptt_pmu_add,
1230 .del = hisi_ptt_pmu_del,
1231 .read = hisi_ptt_pmu_read,
1234 reg = readl(hisi_ptt->iobase + HISI_PTT_LOCATION);
1235 core_id = FIELD_GET(HISI_PTT_CORE_ID, reg);
1236 sicl_id = FIELD_GET(HISI_PTT_SICL_ID, reg);
1238 pmu_name = devm_kasprintf(&hisi_ptt->pdev->dev, GFP_KERNEL, "hisi_ptt%u_%u",
1243 ret = perf_pmu_register(&hisi_ptt->hisi_ptt_pmu, pmu_name, -1);
1247 return devm_add_action_or_reset(&hisi_ptt->pdev->dev,
1248 hisi_ptt_unregister_pmu,
1249 &hisi_ptt->hisi_ptt_pmu);
1252 static void hisi_ptt_unregister_filter_update_notifier(void *data)
1254 struct hisi_ptt *hisi_ptt = data;
1256 bus_unregister_notifier(&pci_bus_type, &hisi_ptt->hisi_ptt_nb);
1258 /* Cancel any work that has been queued */
1259 cancel_delayed_work_sync(&hisi_ptt->work);
1262 /* Register the bus notifier for dynamically updating the filter list */
1263 static int hisi_ptt_register_filter_update_notifier(struct hisi_ptt *hisi_ptt)
1267 hisi_ptt->hisi_ptt_nb.notifier_call = hisi_ptt_notifier_call;
1268 ret = bus_register_notifier(&pci_bus_type, &hisi_ptt->hisi_ptt_nb);
1272 return devm_add_action_or_reset(&hisi_ptt->pdev->dev,
1273 hisi_ptt_unregister_filter_update_notifier,
1278 * The DMA of PTT trace can only use direct mappings due to some
1279 * hardware restriction. Check whether there is no IOMMU or the
1280 * policy of the IOMMU domain is passthrough, otherwise the trace
1283 * The PTT device is supposed to behind an ARM SMMUv3, which
1284 * should have passthrough the device by a quirk.
1286 static int hisi_ptt_check_iommu_mapping(struct pci_dev *pdev)
1288 struct iommu_domain *iommu_domain;
1290 iommu_domain = iommu_get_domain_for_dev(&pdev->dev);
1291 if (!iommu_domain || iommu_domain->type == IOMMU_DOMAIN_IDENTITY)
1297 static int hisi_ptt_probe(struct pci_dev *pdev,
1298 const struct pci_device_id *id)
1300 struct hisi_ptt *hisi_ptt;
1303 ret = hisi_ptt_check_iommu_mapping(pdev);
1305 pci_err(pdev, "requires direct DMA mappings\n");
1309 hisi_ptt = devm_kzalloc(&pdev->dev, sizeof(*hisi_ptt), GFP_KERNEL);
1313 hisi_ptt->pdev = pdev;
1314 pci_set_drvdata(pdev, hisi_ptt);
1316 ret = pcim_enable_device(pdev);
1318 pci_err(pdev, "failed to enable device, ret = %d\n", ret);
1322 ret = pcim_iomap_regions(pdev, BIT(2), DRV_NAME);
1324 pci_err(pdev, "failed to remap io memory, ret = %d\n", ret);
1328 hisi_ptt->iobase = pcim_iomap_table(pdev)[2];
1330 ret = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
1332 pci_err(pdev, "failed to set 64 bit dma mask, ret = %d\n", ret);
1336 pci_set_master(pdev);
1338 ret = hisi_ptt_register_irq(hisi_ptt);
1342 ret = hisi_ptt_init_ctrls(hisi_ptt);
1344 pci_err(pdev, "failed to init controls, ret = %d\n", ret);
1348 ret = hisi_ptt_register_filter_update_notifier(hisi_ptt);
1350 pci_warn(pdev, "failed to register filter update notifier, ret = %d", ret);
1352 ret = hisi_ptt_register_pmu(hisi_ptt);
1354 pci_err(pdev, "failed to register PMU device, ret = %d", ret);
1358 ret = hisi_ptt_init_filter_attributes(hisi_ptt);
1360 pci_err(pdev, "failed to init sysfs filter attributes, ret = %d", ret);
1367 static const struct pci_device_id hisi_ptt_id_tbl[] = {
1368 { PCI_DEVICE(PCI_VENDOR_ID_HUAWEI, 0xa12e) },
1371 MODULE_DEVICE_TABLE(pci, hisi_ptt_id_tbl);
1373 static struct pci_driver hisi_ptt_driver = {
1375 .id_table = hisi_ptt_id_tbl,
1376 .probe = hisi_ptt_probe,
1379 static int hisi_ptt_cpu_teardown(unsigned int cpu, struct hlist_node *node)
1381 struct hisi_ptt *hisi_ptt;
1385 hisi_ptt = hlist_entry_safe(node, struct hisi_ptt, hotplug_node);
1386 src = hisi_ptt->trace_ctrl.on_cpu;
1387 dev = hisi_ptt->hisi_ptt_pmu.dev;
1389 if (!hisi_ptt->trace_ctrl.started || src != cpu)
1392 target = cpumask_any_but(cpumask_of_node(dev_to_node(&hisi_ptt->pdev->dev)), cpu);
1393 if (target >= nr_cpu_ids) {
1394 dev_err(dev, "no available cpu for perf context migration\n");
1398 perf_pmu_migrate_context(&hisi_ptt->hisi_ptt_pmu, src, target);
1401 * Also make sure the interrupt bind to the migrated CPU as well. Warn
1402 * the user on failure here.
1404 if (irq_set_affinity(hisi_ptt->trace_irq, cpumask_of(target)))
1405 dev_warn(dev, "failed to set the affinity of trace interrupt\n");
1407 hisi_ptt->trace_ctrl.on_cpu = target;
1411 static int __init hisi_ptt_init(void)
1415 ret = cpuhp_setup_state_multi(CPUHP_AP_ONLINE_DYN, DRV_NAME, NULL,
1416 hisi_ptt_cpu_teardown);
1419 hisi_ptt_pmu_online = ret;
1421 ret = pci_register_driver(&hisi_ptt_driver);
1423 cpuhp_remove_multi_state(hisi_ptt_pmu_online);
1427 module_init(hisi_ptt_init);
1429 static void __exit hisi_ptt_exit(void)
1431 pci_unregister_driver(&hisi_ptt_driver);
1432 cpuhp_remove_multi_state(hisi_ptt_pmu_online);
1434 module_exit(hisi_ptt_exit);
1436 MODULE_LICENSE("GPL");
1437 MODULE_AUTHOR("Yicong Yang <yangyicong@hisilicon.com>");
1438 MODULE_DESCRIPTION("Driver for HiSilicon PCIe tune and trace device");