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1/* SPDX-License-Identifier: MIT */
2/*
3 * Copyright © 2024 Intel Corporation
4 */
5
6#ifndef _ABI_GUC_LOG_ABI_H
7#define _ABI_GUC_LOG_ABI_H
8
9#include <linux/types.h>
10
11/* GuC logging buffer types */
12enum guc_log_buffer_type {
13 GUC_LOG_BUFFER_CRASH_DUMP,
14 GUC_LOG_BUFFER_DEBUG,
15 GUC_LOG_BUFFER_CAPTURE,
16};
17
18#define GUC_LOG_BUFFER_TYPE_MAX 3
19
20/**
21 * struct guc_log_buffer_state - GuC log buffer state
22 *
23 * Below state structure is used for coordination of retrieval of GuC firmware
24 * logs. Separate state is maintained for each log buffer type.
25 * read_ptr points to the location where Xe read last in log buffer and
26 * is read only for GuC firmware. write_ptr is incremented by GuC with number
27 * of bytes written for each log entry and is read only for Xe.
28 * When any type of log buffer becomes half full, GuC sends a flush interrupt.
29 * GuC firmware expects that while it is writing to 2nd half of the buffer,
30 * first half would get consumed by Host and then get a flush completed
31 * acknowledgment from Host, so that it does not end up doing any overwrite
32 * causing loss of logs. So when buffer gets half filled & Xe has requested
33 * for interrupt, GuC will set flush_to_file field, set the sampled_write_ptr
34 * to the value of write_ptr and raise the interrupt.
35 * On receiving the interrupt Xe should read the buffer, clear flush_to_file
36 * field and also update read_ptr with the value of sample_write_ptr, before
37 * sending an acknowledgment to GuC. marker & version fields are for internal
38 * usage of GuC and opaque to Xe. buffer_full_cnt field is incremented every
39 * time GuC detects the log buffer overflow.
40 */
41struct guc_log_buffer_state {
42 /** @marker: buffer state start marker */
43 u32 marker[2];
44 /** @read_ptr: the last byte offset that was read by KMD previously */
45 u32 read_ptr;
46 /**
47 * @write_ptr: the next byte offset location that will be written by
48 * GuC
49 */
50 u32 write_ptr;
51 /** @size: Log buffer size */
52 u32 size;
53 /**
54 * @sampled_write_ptr: Log buffer write pointer
55 * This is written by GuC to the byte offset of the next free entry in
56 * the buffer on log buffer half full or state capture notification
57 */
58 u32 sampled_write_ptr;
59 /**
60 * @wrap_offset: wraparound offset
61 * This is the byte offset of location 1 byte after last valid guc log
62 * event entry written by Guc firmware before there was a wraparound.
63 * This field is updated by guc firmware and should be used by Host
64 * when copying buffer contents to file.
65 */
66 u32 wrap_offset;
67 /** @flags: Flush to file flag and buffer full count */
68 u32 flags;
69#define GUC_LOG_BUFFER_STATE_FLUSH_TO_FILE GENMASK(0, 0)
70#define GUC_LOG_BUFFER_STATE_BUFFER_FULL_CNT GENMASK(4, 1)
71 /** @version: The Guc-Log-Entry format version */
72 u32 version;
73} __packed;
74
75#endif