diff options
Diffstat (limited to 'drivers/gpu/drm/msm/adreno/a5xx_gpu.h')
| -rw-r--r-- | drivers/gpu/drm/msm/adreno/a5xx_gpu.h | 109 |
1 files changed, 107 insertions, 2 deletions
diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.h b/drivers/gpu/drm/msm/adreno/a5xx_gpu.h index e94451685bf8..6fb8c2f9b9e4 100644 --- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.h +++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.h @@ -1,4 +1,4 @@ -/* Copyright (c) 2016 The Linux Foundation. All rights reserved. +/* 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 @@ -35,10 +35,100 @@ struct a5xx_gpu { 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); @@ -55,7 +145,22 @@ static inline int spin_usecs(struct msm_gpu *gpu, uint32_t usecs, return -ETIMEDOUT; } -bool a5xx_idle(struct msm_gpu *gpu); +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__ */ |