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/* Copyright (c) 2016-2017 The Linux Foundation. All rights reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 and
* only version 2 as published by the Free Software Foundation.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
*/
#ifndef __A5XX_GPU_H__
#define __A5XX_GPU_H__
#include "adreno_gpu.h"
/* Bringing over the hack from the previous targets */
#undef ROP_COPY
#undef ROP_XOR
#include "a5xx.xml.h"
struct a5xx_gpu {
struct adreno_gpu base;
struct drm_gem_object *pm4_bo;
uint64_t pm4_iova;
struct drm_gem_object *pfp_bo;
uint64_t pfp_iova;
struct drm_gem_object *gpmu_bo;
uint64_t gpmu_iova;
uint32_t gpmu_dwords;
uint32_t lm_leakage;
struct msm_ringbuffer *cur_ring;
struct msm_ringbuffer *next_ring;
struct drm_gem_object *preempt_bo[MSM_GPU_MAX_RINGS];
struct a5xx_preempt_record *preempt[MSM_GPU_MAX_RINGS];
uint64_t preempt_iova[MSM_GPU_MAX_RINGS];
atomic_t preempt_state;
struct timer_list preempt_timer;
};
#define to_a5xx_gpu(x) container_of(x, struct a5xx_gpu, base)
/*
* In order to do lockless preemption we use a simple state machine to progress
* through the process.
*
* PREEMPT_NONE - no preemption in progress. Next state START.
* PREEMPT_START - The trigger is evaulating if preemption is possible. Next
* states: TRIGGERED, NONE
* PREEMPT_ABORT - An intermediate state before moving back to NONE. Next
* state: NONE.
* PREEMPT_TRIGGERED: A preemption has been executed on the hardware. Next
* states: FAULTED, PENDING
* PREEMPT_FAULTED: A preemption timed out (never completed). This will trigger
* recovery. Next state: N/A
* PREEMPT_PENDING: Preemption complete interrupt fired - the callback is
* checking the success of the operation. Next state: FAULTED, NONE.
*/
enum preempt_state {
PREEMPT_NONE = 0,
PREEMPT_START,
PREEMPT_ABORT,
PREEMPT_TRIGGERED,
PREEMPT_FAULTED,
PREEMPT_PENDING,
};
/*
* struct a5xx_preempt_record is a shared buffer between the microcode and the
* CPU to store the state for preemption. The record itself is much larger
* (64k) but most of that is used by the CP for storage.
*
* There is a preemption record assigned per ringbuffer. When the CPU triggers a
* preemption, it fills out the record with the useful information (wptr, ring
* base, etc) and the microcode uses that information to set up the CP following
* the preemption. When a ring is switched out, the CP will save the ringbuffer
* state back to the record. In this way, once the records are properly set up
* the CPU can quickly switch back and forth between ringbuffers by only
* updating a few registers (often only the wptr).
*
* These are the CPU aware registers in the record:
* @magic: Must always be 0x27C4BAFC
* @info: Type of the record - written 0 by the CPU, updated by the CP
* @data: Data field from SET_RENDER_MODE or a checkpoint. Written and used by
* the CP
* @cntl: Value of RB_CNTL written by CPU, save/restored by CP
* @rptr: Value of RB_RPTR written by CPU, save/restored by CP
* @wptr: Value of RB_WPTR written by CPU, save/restored by CP
* @rptr_addr: Value of RB_RPTR_ADDR written by CPU, save/restored by CP
* @rbase: Value of RB_BASE written by CPU, save/restored by CP
* @counter: GPU address of the storage area for the performance counters
*/
struct a5xx_preempt_record {
uint32_t magic;
uint32_t info;
uint32_t data;
uint32_t cntl;
uint32_t rptr;
uint32_t wptr;
uint64_t rptr_addr;
uint64_t rbase;
uint64_t counter;
};
/* Magic identifier for the preemption record */
#define A5XX_PREEMPT_RECORD_MAGIC 0x27C4BAFCUL
/*
* Even though the structure above is only a few bytes, we need a full 64k to
* store the entire preemption record from the CP
*/
#define A5XX_PREEMPT_RECORD_SIZE (64 * 1024)
/*
* The preemption counter block is a storage area for the value of the
* preemption counters that are saved immediately before context switch. We
* append it on to the end of the allocation for the preemption record.
*/
#define A5XX_PREEMPT_COUNTER_SIZE (16 * 4)
int a5xx_power_init(struct msm_gpu *gpu);
void a5xx_gpmu_ucode_init(struct msm_gpu *gpu);
static inline int spin_usecs(struct msm_gpu *gpu, uint32_t usecs,
uint32_t reg, uint32_t mask, uint32_t value)
{
while (usecs--) {
udelay(1);
if ((gpu_read(gpu, reg) & mask) == value)
return 0;
cpu_relax();
}
return -ETIMEDOUT;
}
bool a5xx_idle(struct msm_gpu *gpu, struct msm_ringbuffer *ring);
void a5xx_set_hwcg(struct msm_gpu *gpu, bool state);
void a5xx_preempt_init(struct msm_gpu *gpu);
void a5xx_preempt_hw_init(struct msm_gpu *gpu);
void a5xx_preempt_trigger(struct msm_gpu *gpu);
void a5xx_preempt_irq(struct msm_gpu *gpu);
void a5xx_preempt_fini(struct msm_gpu *gpu);
/* Return true if we are in a preempt state */
static inline bool a5xx_in_preempt(struct a5xx_gpu *a5xx_gpu)
{
int preempt_state = atomic_read(&a5xx_gpu->preempt_state);
return !(preempt_state == PREEMPT_NONE ||
preempt_state == PREEMPT_ABORT);
}
#endif /* __A5XX_GPU_H__ */
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