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 21 struct 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 30 struct msm_rbmemptrs { 31 volatile uint32_t rptr; 32 volatile uint32_t fence; 33 /* Introduced on A7xx */ 34 volatile uint32_t bv_rptr; 35 volatile uint32_t bv_fence; 36 37 volatile struct msm_gpu_submit_stats stats[MSM_GPU_SUBMIT_STATS_COUNT]; 38 volatile u64 ttbr0; 39 volatile u32 context_idr; 40 41 volatile u32 perfcntr_fence; 42 }; 43 44 struct msm_cp_state { 45 uint64_t ib1_base, ib2_base; 46 uint32_t ib1_rem, ib2_rem; 47 }; 48 49 struct msm_ringbuffer { 50 struct msm_gpu *gpu; 51 int id; 52 struct drm_gem_object *bo; 53 uint32_t *start, *end, *cur, *next; 54 55 /* 56 * The job scheduler for this ring. 57 */ 58 struct drm_gpu_scheduler sched; 59 bool sched_initialized; 60 61 /* 62 * List of in-flight submits on this ring. Protected by submit_lock. 63 * 64 * Currently just submits that are already written into the ring, not 65 * submits that are still in drm_gpu_scheduler's queues. At a later 66 * step we could probably move to letting drm_gpu_scheduler manage 67 * hangcheck detection and keep track of submit jobs that are in- 68 * flight. 69 */ 70 struct list_head submits; 71 spinlock_t submit_lock; 72 73 uint64_t iova; 74 uint32_t hangcheck_fence; 75 struct msm_rbmemptrs *memptrs; 76 uint64_t memptrs_iova; 77 struct msm_fence_context *fctx; 78 79 /** 80 * hangcheck_progress_retries: 81 * 82 * The number of extra hangcheck duration cycles that we have given 83 * due to it appearing that the GPU is making forward progress. 84 * 85 * For GPU generations which support progress detection (see. 86 * msm_gpu_funcs::progress()), if the GPU appears to be making progress 87 * (ie. the CP has advanced in the command stream, we'll allow up to 88 * DRM_MSM_HANGCHECK_PROGRESS_RETRIES expirations of the hangcheck timer 89 * before killing the job. But to detect progress we need two sample 90 * points, so the duration of the hangcheck timer is halved. In other 91 * words we'll let the submit run for up to: 92 * 93 * (DRM_MSM_HANGCHECK_DEFAULT_PERIOD / 2) * (DRM_MSM_HANGCHECK_PROGRESS_RETRIES + 1) 94 */ 95 int hangcheck_progress_retries; 96 97 /** 98 * last_cp_state: The state of the CP at the last call to gpu->progress() 99 */ 100 struct msm_cp_state last_cp_state; 101 102 /* 103 * preempt_lock protects preemption and serializes wptr updates against 104 * preemption. Can be aquired from irq context. 105 */ 106 spinlock_t preempt_lock; 107 108 /* 109 * Whether we skipped writing wptr and it needs to be updated in the 110 * future when the ring becomes current. 111 */ 112 bool restore_wptr; 113 114 /** 115 * cur_ctx_seqno: 116 * 117 * The ctx->seqno value of the last context to submit to this ring 118 * Tracked by seqno rather than pointer value to avoid dangling 119 * pointers, and cases where a ctx can be freed and a new one created 120 * with the same address. 121 */ 122 int cur_ctx_seqno; 123 }; 124 125 struct msm_ringbuffer *msm_ringbuffer_new(struct msm_gpu *gpu, int id, 126 void *memptrs, uint64_t memptrs_iova); 127 void msm_ringbuffer_destroy(struct msm_ringbuffer *ring); 128 129 /* ringbuffer helpers (the parts that are same for a3xx/a2xx/z180..) */ 130 131 static inline void 132 OUT_RING(struct msm_ringbuffer *ring, uint32_t data) 133 { 134 /* 135 * ring->next points to the current command being written - it won't be 136 * committed as ring->cur until the flush 137 */ 138 if (ring->next == ring->end) 139 ring->next = ring->start; 140 *(ring->next++) = data; 141 } 142 143 #endif /* __MSM_RINGBUFFER_H__ */ 144