drivers/gpu/drm/msm/adreno/a5xx_gpu.h

   1 /* Copyright (c) 2016-2017 The Linux Foundation. All rights reserved.
   2  *
   3  * This program is free software; you can redistribute it and/or modify
   4  * it under the terms of the GNU General Public License version 2 and
   5  * only version 2 as published by the Free Software Foundation.
   6  *
   7  * This program is distributed in the hope that it will be useful,
   8  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   9  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  10  * GNU General Public License for more details.
  11  *
  12  */
  13 #ifndef __A5XX_GPU_H__
  14 #define __A5XX_GPU_H__
  15
  16 #include "adreno_gpu.h"
  17
  18 /* Bringing over the hack from the previous targets */
  19 #undef ROP_COPY
  20 #undef ROP_XOR
  21
  22 #include "a5xx.xml.h"
  23
  24 struct a5xx_gpu {
  25         struct adreno_gpu base;
  26
  27         struct drm_gem_object *pm4_bo;
  28         uint64_t pm4_iova;
  29
  30         struct drm_gem_object *pfp_bo;
  31         uint64_t pfp_iova;
  32
  33         struct drm_gem_object *gpmu_bo;
  34         uint64_t gpmu_iova;
  35         uint32_t gpmu_dwords;
  36
  37         uint32_t lm_leakage;
  38
  39         struct msm_ringbuffer *cur_ring;
  40         struct msm_ringbuffer *next_ring;
  41
  42         struct drm_gem_object *preempt_bo[MSM_GPU_MAX_RINGS];
  43         struct a5xx_preempt_record *preempt[MSM_GPU_MAX_RINGS];
  44         uint64_t preempt_iova[MSM_GPU_MAX_RINGS];
  45
  46         atomic_t preempt_state;
  47         struct timer_list preempt_timer;
  48 };
  49
  50 #define to_a5xx_gpu(x) container_of(x, struct a5xx_gpu, base)
  51
  52 /*
  53  * In order to do lockless preemption we use a simple state machine to progress
  54  * through the process.
  55  *
  56  * PREEMPT_NONE - no preemption in progress.  Next state START.
  57  * PREEMPT_START - The trigger is evaulating if preemption is possible. Next
  58  * states: TRIGGERED, NONE
  59  * PREEMPT_ABORT - An intermediate state before moving back to NONE. Next
  60  * state: NONE.
  61  * PREEMPT_TRIGGERED: A preemption has been executed on the hardware. Next
  62  * states: FAULTED, PENDING
  63  * PREEMPT_FAULTED: A preemption timed out (never completed). This will trigger
  64  * recovery.  Next state: N/A
  65  * PREEMPT_PENDING: Preemption complete interrupt fired - the callback is
  66  * checking the success of the operation. Next state: FAULTED, NONE.
  67  */
  68
  69 enum preempt_state {
  70         PREEMPT_NONE = 0,
  71         PREEMPT_START,
  72         PREEMPT_ABORT,
  73         PREEMPT_TRIGGERED,
  74         PREEMPT_FAULTED,
  75         PREEMPT_PENDING,
  76 };
  77
  78 /*
  79  * struct a5xx_preempt_record is a shared buffer between the microcode and the
  80  * CPU to store the state for preemption. The record itself is much larger
  81  * (64k) but most of that is used by the CP for storage.
  82  *
  83  * There is a preemption record assigned per ringbuffer. When the CPU triggers a
  84  * preemption, it fills out the record with the useful information (wptr, ring
  85  * base, etc) and the microcode uses that information to set up the CP following
  86  * the preemption.  When a ring is switched out, the CP will save the ringbuffer
  87  * state back to the record. In this way, once the records are properly set up
  88  * the CPU can quickly switch back and forth between ringbuffers by only
  89  * updating a few registers (often only the wptr).
  90  *
  91  * These are the CPU aware registers in the record:
  92  * @magic: Must always be 0x27C4BAFC
  93  * @info: Type of the record - written 0 by the CPU, updated by the CP
  94  * @data: Data field from SET_RENDER_MODE or a checkpoint. Written and used by
  95  * the CP
  96  * @cntl: Value of RB_CNTL written by CPU, save/restored by CP
  97  * @rptr: Value of RB_RPTR written by CPU, save/restored by CP
  98  * @wptr: Value of RB_WPTR written by CPU, save/restored by CP
  99  * @rptr_addr: Value of RB_RPTR_ADDR written by CPU, save/restored by CP
 100  * @rbase: Value of RB_BASE written by CPU, save/restored by CP
 101  * @counter: GPU address of the storage area for the performance counters
 102  */
 103 struct a5xx_preempt_record {
 104         uint32_t magic;
 105         uint32_t info;
 106         uint32_t data;
 107         uint32_t cntl;
 108         uint32_t rptr;
 109         uint32_t wptr;
 110         uint64_t rptr_addr;
 111         uint64_t rbase;
 112         uint64_t counter;
 113 };
 114
 115 /* Magic identifier for the preemption record */
 116 #define A5XX_PREEMPT_RECORD_MAGIC 0x27C4BAFCUL
 117
 118 /*
 119  * Even though the structure above is only a few bytes, we need a full 64k to
 120  * store the entire preemption record from the CP
 121  */
 122 #define A5XX_PREEMPT_RECORD_SIZE (64 * 1024)
 123
 124 /*
 125  * The preemption counter block is a storage area for the value of the
 126  * preemption counters that are saved immediately before context switch. We
 127  * append it on to the end of the allocation for the preemption record.
 128  */
 129 #define A5XX_PREEMPT_COUNTER_SIZE (16 * 4)
 130
 131
 132 int a5xx_power_init(struct msm_gpu *gpu);
 133 void a5xx_gpmu_ucode_init(struct msm_gpu *gpu);
 134
 135 static inline int spin_usecs(struct msm_gpu *gpu, uint32_t usecs,
 136                 uint32_t reg, uint32_t mask, uint32_t value)
 137 {
 138         while (usecs--) {
 139                 udelay(1);
 140                 if ((gpu_read(gpu, reg) & mask) == value)
 141                         return 0;
 142                 cpu_relax();
 143         }
 144
 145         return -ETIMEDOUT;
 146 }
 147
 148 bool a5xx_idle(struct msm_gpu *gpu, struct msm_ringbuffer *ring);
 149 void a5xx_set_hwcg(struct msm_gpu *gpu, bool state);
 150
 151 void a5xx_preempt_init(struct msm_gpu *gpu);
 152 void a5xx_preempt_hw_init(struct msm_gpu *gpu);
 153 void a5xx_preempt_trigger(struct msm_gpu *gpu);
 154 void a5xx_preempt_irq(struct msm_gpu *gpu);
 155 void a5xx_preempt_fini(struct msm_gpu *gpu);
 156
 157 /* Return true if we are in a preempt state */
 158 static inline bool a5xx_in_preempt(struct a5xx_gpu *a5xx_gpu)
 159 {
 160         int preempt_state = atomic_read(&a5xx_gpu->preempt_state);
 161
 162         return !(preempt_state == PREEMPT_NONE ||
 163                         preempt_state == PREEMPT_ABORT);
 164 }
 165
 166 #endif /* __A5XX_GPU_H__ */