1 /* SPDX-License-Identifier: MIT */
3 * Copyright © 2019 Intel Corporation
6 #ifndef _I915_PERF_TYPES_H_
7 #define _I915_PERF_TYPES_H_
9 #include <linux/atomic.h>
10 #include <linux/device.h>
11 #include <linux/hrtimer.h>
12 #include <linux/llist.h>
13 #include <linux/poll.h>
14 #include <linux/sysfs.h>
15 #include <linux/types.h>
16 #include <linux/uuid.h>
17 #include <linux/wait.h>
20 #include "intel_wakeref.h"
22 struct drm_i915_private;
24 struct i915_gem_context;
28 struct intel_engine_cs;
30 struct i915_oa_format {
40 struct i915_oa_config {
41 struct i915_perf *perf;
43 char uuid[UUID_STRING_LEN + 1];
46 const struct i915_oa_reg *mux_regs;
48 const struct i915_oa_reg *b_counter_regs;
49 u32 b_counter_regs_len;
50 const struct i915_oa_reg *flex_regs;
53 struct attribute_group sysfs_metric;
54 struct attribute *attrs[2];
55 struct device_attribute sysfs_metric_id;
61 struct i915_perf_stream;
64 * struct i915_perf_stream_ops - the OPs to support a specific stream type
66 struct i915_perf_stream_ops {
68 * @enable: Enables the collection of HW samples, either in response to
69 * `I915_PERF_IOCTL_ENABLE` or implicitly called when stream is opened
70 * without `I915_PERF_FLAG_DISABLED`.
72 void (*enable)(struct i915_perf_stream *stream);
75 * @disable: Disables the collection of HW samples, either in response
76 * to `I915_PERF_IOCTL_DISABLE` or implicitly called before destroying
79 void (*disable)(struct i915_perf_stream *stream);
82 * @poll_wait: Call poll_wait, passing a wait queue that will be woken
83 * once there is something ready to read() for the stream
85 void (*poll_wait)(struct i915_perf_stream *stream,
90 * @wait_unlocked: For handling a blocking read, wait until there is
91 * something to ready to read() for the stream. E.g. wait on the same
92 * wait queue that would be passed to poll_wait().
94 int (*wait_unlocked)(struct i915_perf_stream *stream);
97 * @read: Copy buffered metrics as records to userspace
98 * **buf**: the userspace, destination buffer
99 * **count**: the number of bytes to copy, requested by userspace
100 * **offset**: zero at the start of the read, updated as the read
101 * proceeds, it represents how many bytes have been copied so far and
102 * the buffer offset for copying the next record.
104 * Copy as many buffered i915 perf samples and records for this stream
105 * to userspace as will fit in the given buffer.
107 * Only write complete records; returning -%ENOSPC if there isn't room
108 * for a complete record.
110 * Return any error condition that results in a short read such as
111 * -%ENOSPC or -%EFAULT, even though these may be squashed before
112 * returning to userspace.
114 int (*read)(struct i915_perf_stream *stream,
120 * @destroy: Cleanup any stream specific resources.
122 * The stream will always be disabled before this is called.
124 void (*destroy)(struct i915_perf_stream *stream);
128 * struct i915_perf_stream - state for a single open stream FD
130 struct i915_perf_stream {
132 * @perf: i915_perf backpointer
134 struct i915_perf *perf;
137 * @uncore: mmio access path
139 struct intel_uncore *uncore;
142 * @engine: Engine associated with this performance stream.
144 struct intel_engine_cs *engine;
147 * @sample_flags: Flags representing the `DRM_I915_PERF_PROP_SAMPLE_*`
148 * properties given when opening a stream, representing the contents
149 * of a single sample as read() by userspace.
154 * @sample_size: Considering the configured contents of a sample
155 * combined with the required header size, this is the total size
156 * of a single sample record.
161 * @ctx: %NULL if measuring system-wide across all contexts or a
162 * specific context that is being monitored.
164 struct i915_gem_context *ctx;
167 * @enabled: Whether the stream is currently enabled, considering
168 * whether the stream was opened in a disabled state and based
169 * on `I915_PERF_IOCTL_ENABLE` and `I915_PERF_IOCTL_DISABLE` calls.
174 * @hold_preemption: Whether preemption is put on hold for command
175 * submissions done on the @ctx. This is useful for some drivers that
176 * cannot easily post process the OA buffer context to subtract delta
177 * of performance counters not associated with @ctx.
179 bool hold_preemption;
182 * @ops: The callbacks providing the implementation of this specific
183 * type of configured stream.
185 const struct i915_perf_stream_ops *ops;
188 * @oa_config: The OA configuration used by the stream.
190 struct i915_oa_config *oa_config;
193 * @oa_config_bos: A list of struct i915_oa_config_bo allocated lazily
194 * each time @oa_config changes.
196 struct llist_head oa_config_bos;
199 * @pinned_ctx: The OA context specific information.
201 struct intel_context *pinned_ctx;
203 u32 specific_ctx_id_mask;
205 struct hrtimer poll_check_timer;
206 wait_queue_head_t poll_wq;
213 * @oa_buffer: State of the OA buffer.
216 struct i915_vma *vma;
224 * @ptr_lock: Locks reads and writes to all head/tail state
226 * Consider: the head and tail pointer state needs to be read
227 * consistently from a hrtimer callback (atomic context) and
228 * read() fop (user context) with tail pointer updates happening
229 * in atomic context and head updates in user context and the
230 * (unlikely) possibility of read() errors needing to reset all
233 * Note: Contention/performance aren't currently a significant
234 * concern here considering the relatively low frequency of
235 * hrtimer callbacks (5ms period) and that reads typically only
236 * happen in response to a hrtimer event and likely complete
237 * before the next callback.
239 * Note: This lock is not held *while* reading and copying data
240 * to userspace so the value of head observed in htrimer
241 * callbacks won't represent any partial consumption of data.
246 * @tails: One 'aging' tail pointer and one 'aged' tail pointer ready to
249 * Initial values of 0xffffffff are invalid and imply that an
250 * update is required (and should be ignored by an attempted
258 * @aged_tail_idx: Index for the aged tail ready to read() data up to.
260 unsigned int aged_tail_idx;
263 * @aging_timestamp: A monotonic timestamp for when the current aging tail pointer
264 * was read; used to determine when it is old enough to trust.
269 * @head: Although we can always read back the head pointer register,
270 * we prefer to avoid trusting the HW state, just to avoid any
271 * risk that some hardware condition could * somehow bump the
272 * head pointer unpredictably and cause us to forward the wrong
273 * OA buffer data to userspace.
279 * A batch buffer doing a wait on the GPU for the NOA logic to be
282 struct i915_vma *noa_wait;
286 * struct i915_oa_ops - Gen specific implementation of an OA unit stream
290 * @is_valid_b_counter_reg: Validates register's address for
291 * programming boolean counters for a particular platform.
293 bool (*is_valid_b_counter_reg)(struct i915_perf *perf, u32 addr);
296 * @is_valid_mux_reg: Validates register's address for programming mux
297 * for a particular platform.
299 bool (*is_valid_mux_reg)(struct i915_perf *perf, u32 addr);
302 * @is_valid_flex_reg: Validates register's address for programming
303 * flex EU filtering for a particular platform.
305 bool (*is_valid_flex_reg)(struct i915_perf *perf, u32 addr);
308 * @enable_metric_set: Selects and applies any MUX configuration to set
309 * up the Boolean and Custom (B/C) counters that are part of the
310 * counter reports being sampled. May apply system constraints such as
311 * disabling EU clock gating as required.
313 int (*enable_metric_set)(struct i915_perf_stream *stream);
316 * @disable_metric_set: Remove system constraints associated with using
319 void (*disable_metric_set)(struct i915_perf_stream *stream);
322 * @oa_enable: Enable periodic sampling
324 void (*oa_enable)(struct i915_perf_stream *stream);
327 * @oa_disable: Disable periodic sampling
329 void (*oa_disable)(struct i915_perf_stream *stream);
332 * @read: Copy data from the circular OA buffer into a given userspace
335 int (*read)(struct i915_perf_stream *stream,
341 * @oa_hw_tail_read: read the OA tail pointer register
343 * In particular this enables us to share all the fiddly code for
344 * handling the OA unit tail pointer race that affects multiple
347 u32 (*oa_hw_tail_read)(struct i915_perf_stream *stream);
351 struct drm_i915_private *i915;
353 struct kobject *metrics_kobj;
354 struct ctl_table_header *sysctl_header;
357 * Lock associated with adding/modifying/removing OA configs
358 * in perf->metrics_idr.
360 struct mutex metrics_lock;
363 * List of dynamic configurations (struct i915_oa_config), you
364 * need to hold perf->metrics_lock to access it.
366 struct idr metrics_idr;
369 * Lock associated with anything below within this structure
370 * except exclusive_stream.
375 * The stream currently using the OA unit. If accessed
376 * outside a syscall associated to its file
379 struct i915_perf_stream *exclusive_stream;
382 * For rate limiting any notifications of spurious
385 struct ratelimit_state spurious_report_rs;
387 struct i915_oa_config test_config;
389 u32 gen7_latched_oastatus1;
390 u32 ctx_oactxctrl_offset;
391 u32 ctx_flexeu0_offset;
394 * The RPT_ID/reason field for Gen8+ includes a bit
395 * to determine if the CTX ID in the report is valid
396 * but the specific bit differs between Gen 8 and 9
398 u32 gen8_valid_ctx_bit;
400 struct i915_oa_ops ops;
401 const struct i915_oa_format *oa_formats;
403 atomic64_t noa_programming_delay;
406 #endif /* _I915_PERF_TYPES_H_ */