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>
12 #include <linux/bits.h>
13 #include <linux/cpumask.h>
14 #include <linux/device.h>
15 #include <linux/kfifo.h>
16 #include <linux/list.h>
17 #include <linux/mutex.h>
18 #include <linux/notifier.h>
19 #include <linux/pci.h>
20 #include <linux/perf_event.h>
21 #include <linux/spinlock.h>
22 #include <linux/types.h>
23 #include <linux/workqueue.h>
25 #define DRV_NAME "hisi_ptt"
28 * The definition of the device registers and register fields.
30 #define HISI_PTT_TUNING_CTRL 0x0000
31 #define HISI_PTT_TUNING_CTRL_CODE GENMASK(15, 0)
32 #define HISI_PTT_TUNING_CTRL_SUB GENMASK(23, 16)
33 #define HISI_PTT_TUNING_DATA 0x0004
34 #define HISI_PTT_TUNING_DATA_VAL_MASK GENMASK(15, 0)
35 #define HISI_PTT_TRACE_ADDR_SIZE 0x0800
36 #define HISI_PTT_TRACE_ADDR_BASE_LO_0 0x0810
37 #define HISI_PTT_TRACE_ADDR_BASE_HI_0 0x0814
38 #define HISI_PTT_TRACE_ADDR_STRIDE 0x8
39 #define HISI_PTT_TRACE_CTRL 0x0850
40 #define HISI_PTT_TRACE_CTRL_EN BIT(0)
41 #define HISI_PTT_TRACE_CTRL_RST BIT(1)
42 #define HISI_PTT_TRACE_CTRL_RXTX_SEL GENMASK(3, 2)
43 #define HISI_PTT_TRACE_CTRL_TYPE_SEL GENMASK(7, 4)
44 #define HISI_PTT_TRACE_CTRL_DATA_FORMAT BIT(14)
45 #define HISI_PTT_TRACE_CTRL_FILTER_MODE BIT(15)
46 #define HISI_PTT_TRACE_CTRL_TARGET_SEL GENMASK(31, 16)
47 #define HISI_PTT_TRACE_INT_STAT 0x0890
48 #define HISI_PTT_TRACE_INT_STAT_MASK GENMASK(3, 0)
49 #define HISI_PTT_TRACE_INT_MASK 0x0894
50 #define HISI_PTT_TUNING_INT_STAT 0x0898
51 #define HISI_PTT_TUNING_INT_STAT_MASK BIT(0)
52 #define HISI_PTT_TRACE_WR_STS 0x08a0
53 #define HISI_PTT_TRACE_WR_STS_WRITE GENMASK(27, 0)
54 #define HISI_PTT_TRACE_WR_STS_BUFFER GENMASK(29, 28)
55 #define HISI_PTT_TRACE_STS 0x08b0
56 #define HISI_PTT_TRACE_IDLE BIT(0)
57 #define HISI_PTT_DEVICE_RANGE 0x0fe0
58 #define HISI_PTT_DEVICE_RANGE_UPPER GENMASK(31, 16)
59 #define HISI_PTT_DEVICE_RANGE_LOWER GENMASK(15, 0)
60 #define HISI_PTT_LOCATION 0x0fe8
61 #define HISI_PTT_CORE_ID GENMASK(15, 0)
62 #define HISI_PTT_SICL_ID GENMASK(31, 16)
64 /* Parameters of PTT trace DMA part. */
65 #define HISI_PTT_TRACE_DMA_IRQ 0
66 #define HISI_PTT_TRACE_BUF_CNT 4
67 #define HISI_PTT_TRACE_BUF_SIZE SZ_4M
68 #define HISI_PTT_TRACE_TOTAL_BUF_SIZE (HISI_PTT_TRACE_BUF_SIZE * \
69 HISI_PTT_TRACE_BUF_CNT)
70 /* Wait time for hardware DMA to reset */
71 #define HISI_PTT_RESET_TIMEOUT_US 10UL
72 #define HISI_PTT_RESET_POLL_INTERVAL_US 1UL
73 /* Poll timeout and interval for waiting hardware work to finish */
74 #define HISI_PTT_WAIT_TUNE_TIMEOUT_US 1000000UL
75 #define HISI_PTT_WAIT_TRACE_TIMEOUT_US 100UL
76 #define HISI_PTT_WAIT_POLL_INTERVAL_US 10UL
78 /* FIFO size for dynamically updating the PTT trace filter list. */
79 #define HISI_PTT_FILTER_UPDATE_FIFO_SIZE 16
80 /* Delay time for filter updating work */
81 #define HISI_PTT_WORK_DELAY_MS 100UL
83 #define HISI_PCIE_CORE_PORT_ID(devfn) ((PCI_SLOT(devfn) & 0x7) << 1)
85 /* Definition of the PMU configs */
86 #define HISI_PTT_PMU_FILTER_IS_PORT BIT(19)
87 #define HISI_PTT_PMU_FILTER_VAL_MASK GENMASK(15, 0)
88 #define HISI_PTT_PMU_DIRECTION_MASK GENMASK(23, 20)
89 #define HISI_PTT_PMU_TYPE_MASK GENMASK(31, 24)
90 #define HISI_PTT_PMU_FORMAT_MASK GENMASK(35, 32)
93 * struct hisi_ptt_tune_desc - Describe tune event for PTT tune
94 * @hisi_ptt: PTT device this tune event belongs to
95 * @name: name of this event
96 * @event_code: code of the event
98 struct hisi_ptt_tune_desc {
99 struct hisi_ptt *hisi_ptt;
105 * struct hisi_ptt_dma_buffer - Describe a single trace buffer of PTT trace.
106 * The detail of the data format is described
107 * in the documentation of PTT device.
108 * @dma: DMA address of this buffer visible to the device
109 * @addr: virtual address of this buffer visible to the cpu
111 struct hisi_ptt_dma_buffer {
117 * struct hisi_ptt_trace_ctrl - Control and status of PTT trace
118 * @trace_buf: array of the trace buffers for holding the trace data.
119 * the length will be HISI_PTT_TRACE_BUF_CNT.
120 * @handle: perf output handle of current trace session
121 * @buf_index: the index of current using trace buffer
122 * @on_cpu: current tracing cpu
123 * @started: current trace status, true for started
124 * @is_port: whether we're tracing root port or not
125 * @direction: direction of the TLP headers to trace
126 * @filter: filter value for tracing the TLP headers
127 * @format: format of the TLP headers to trace
128 * @type: type of the TLP headers to trace
130 struct hisi_ptt_trace_ctrl {
131 struct hisi_ptt_dma_buffer *trace_buf;
132 struct perf_output_handle handle;
144 * sysfs attribute group name for root port filters and requester filters:
145 * /sys/devices/hisi_ptt<sicl_id>_<core_id>/root_port_filters
147 * /sys/devices/hisi_ptt<sicl_id>_<core_id>/requester_filters
149 #define HISI_PTT_RP_FILTERS_GRP_NAME "root_port_filters"
150 #define HISI_PTT_REQ_FILTERS_GRP_NAME "requester_filters"
153 * struct hisi_ptt_filter_desc - Descriptor of the PTT trace filter
154 * @attr: sysfs attribute of this filter
155 * @list: entry of this descriptor in the filter list
156 * @is_port: the PCI device of the filter is a Root Port or not
157 * @name: name of this filter, same as the name of the related PCI device
158 * @devid: the PCI device's devid of the filter
160 struct hisi_ptt_filter_desc {
161 struct device_attribute attr;
162 struct list_head list;
169 * struct hisi_ptt_filter_update_info - Information for PTT filter updating
170 * @is_port: the PCI device to update is a Root Port or not
171 * @is_add: adding to the filter or not
172 * @devid: the PCI device's devid of the filter
174 struct hisi_ptt_filter_update_info {
181 * struct hisi_ptt_pmu_buf - Descriptor of the AUX buffer of PTT trace
182 * @length: size of the AUX buffer
183 * @nr_pages: number of pages of the AUX buffer
184 * @base: start address of AUX buffer
185 * @pos: position in the AUX buffer to commit traced data
187 struct hisi_ptt_pmu_buf {
195 * struct hisi_ptt - Per PTT device data
196 * @trace_ctrl: the control information of PTT trace
197 * @hisi_ptt_nb: dynamic filter update notifier
198 * @hotplug_node: node for register cpu hotplug event
199 * @hisi_ptt_pmu: the pum device of trace
200 * @iobase: base IO address of the device
201 * @pdev: pci_dev of this PTT device
202 * @tune_lock: lock to serialize the tune process
203 * @pmu_lock: lock to serialize the perf process
204 * @trace_irq: interrupt number used by trace
205 * @upper_bdf: the upper BDF range of the PCI devices managed by this PTT device
206 * @lower_bdf: the lower BDF range of the PCI devices managed by this PTT device
207 * @port_filters: the filter list of root ports
208 * @req_filters: the filter list of requester ID
209 * @filter_lock: lock to protect the filters
210 * @sysfs_inited: whether the filters' sysfs entries has been initialized
211 * @port_mask: port mask of the managed root ports
212 * @work: delayed work for filter updating
213 * @filter_update_lock: spinlock to protect the filter update fifo
214 * @filter_update_fifo: fifo of the filters waiting to update the filter list
217 struct hisi_ptt_trace_ctrl trace_ctrl;
218 struct notifier_block hisi_ptt_nb;
219 struct hlist_node hotplug_node;
220 struct pmu hisi_ptt_pmu;
221 void __iomem *iobase;
222 struct pci_dev *pdev;
223 struct mutex tune_lock;
230 * The trace TLP headers can either be filtered by certain
231 * root port, or by the requester ID. Organize the filters
232 * by @port_filters and @req_filters here. The mask of all
233 * the valid ports is also cached for doing sanity check
236 struct list_head port_filters;
237 struct list_head req_filters;
238 struct mutex filter_lock;
243 * We use a delayed work here to avoid indefinitely waiting for
244 * the hisi_ptt->mutex which protecting the filter list. The
245 * work will be delayed only if the mutex can not be held,
246 * otherwise no delay will be applied.
248 struct delayed_work work;
249 spinlock_t filter_update_lock;
250 DECLARE_KFIFO(filter_update_kfifo, struct hisi_ptt_filter_update_info,
251 HISI_PTT_FILTER_UPDATE_FIFO_SIZE);
254 #define to_hisi_ptt(pmu) container_of(pmu, struct hisi_ptt, hisi_ptt_pmu)
256 #endif /* _HISI_PTT_H */