1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2013 Red Hat
4 * Author: Rob Clark <robdclark@gmail.com>
5 */
6
7#ifndef __MSM_RINGBUFFER_H__
8#define __MSM_RINGBUFFER_H__
9
10#include "drm/gpu_scheduler.h"
11#include "msm_drv.h"
12
13#define rbmemptr(ring, member) \
14 ((ring)->memptrs_iova + offsetof(struct msm_rbmemptrs, member))
15
16#define rbmemptr_stats(ring, index, member) \
17 (rbmemptr((ring), stats) + \
18 ((index) * sizeof(struct msm_gpu_submit_stats)) + \
19 offsetof(struct msm_gpu_submit_stats, member))
20
21struct msm_gpu_submit_stats {
22 u64 cpcycles_start;
23 u64 cpcycles_end;
24 u64 alwayson_start;
25 u64 alwayson_end;
26};
27
28#define MSM_GPU_SUBMIT_STATS_COUNT 64
29
30struct msm_rbmemptrs {
31 volatile uint32_t rptr;
32 volatile uint32_t fence;
33 /* Introduced on A7xx */
34 volatile uint32_t bv_fence;
35
36 volatile struct msm_gpu_submit_stats stats[MSM_GPU_SUBMIT_STATS_COUNT];
37 volatile u64 ttbr0;
38};
39
40struct msm_cp_state {
41 uint64_t ib1_base, ib2_base;
42 uint32_t ib1_rem, ib2_rem;
43};
44
45struct msm_ringbuffer {
46 struct msm_gpu *gpu;
47 int id;
48 struct drm_gem_object *bo;
49 uint32_t *start, *end, *cur, *next;
50
51 /*
52 * The job scheduler for this ring.
53 */
54 struct drm_gpu_scheduler sched;
55
56 /*
57 * List of in-flight submits on this ring. Protected by submit_lock.
58 *
59 * Currently just submits that are already written into the ring, not
60 * submits that are still in drm_gpu_scheduler's queues. At a later
61 * step we could probably move to letting drm_gpu_scheduler manage
62 * hangcheck detection and keep track of submit jobs that are in-
63 * flight.
64 */
65 struct list_head submits;
66 spinlock_t submit_lock;
67
68 uint64_t iova;
69 uint32_t hangcheck_fence;
70 struct msm_rbmemptrs *memptrs;
71 uint64_t memptrs_iova;
72 struct msm_fence_context *fctx;
73
74 /**
75 * hangcheck_progress_retries:
76 *
77 * The number of extra hangcheck duration cycles that we have given
78 * due to it appearing that the GPU is making forward progress.
79 *
80 * For GPU generations which support progress detection (see.
81 * msm_gpu_funcs::progress()), if the GPU appears to be making progress
82 * (ie. the CP has advanced in the command stream, we'll allow up to
83 * DRM_MSM_HANGCHECK_PROGRESS_RETRIES expirations of the hangcheck timer
84 * before killing the job. But to detect progress we need two sample
85 * points, so the duration of the hangcheck timer is halved. In other
86 * words we'll let the submit run for up to:
87 *
88 * (DRM_MSM_HANGCHECK_DEFAULT_PERIOD / 2) * (DRM_MSM_HANGCHECK_PROGRESS_RETRIES + 1)
89 */
90 int hangcheck_progress_retries;
91
92 /**
93 * last_cp_state: The state of the CP at the last call to gpu->progress()
94 */
95 struct msm_cp_state last_cp_state;
96
97 /*
98 * preempt_lock protects preemption and serializes wptr updates against
99 * preemption. Can be aquired from irq context.
100 */
101 spinlock_t preempt_lock;
102};
103
104struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int id,
105 void *memptrs, uint64_t memptrs_iova);
106void msm_ringbuffer_destroy(struct msm_ringbuffer *ring);
107
108/* ringbuffer helpers (the parts that are same for a3xx/a2xx/z180..) */
109
110static inline void
111OUT_RING(struct msm_ringbuffer *ring, uint32_t data)
112{
113 /*
114 * ring->next points to the current command being written - it won't be
115 * committed as ring->cur until the flush
116 */
117 if (ring->next == ring->end)
118 ring->next = ring->start;
119 *(ring->next++) = data;
120}
121
122#endif /* __MSM_RINGBUFFER_H__ */
123

source code of linux/drivers/gpu/drm/msm/msm_ringbuffer.h