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    Copyright (c) 2015 NVIDIA Corporation

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#ifndef __UVM_GPU_PAGE_FAULT_H__
#define __UVM_GPU_PAGE_FAULT_H__

#include "nvtypes.h"
#include "uvm_types.h"
#include "uvm_hal_types.h"
#include "uvm_tracker.h"

typedef enum
{
    // Issue a fault replay after all faults for a block within a batch have been serviced
    UVM_PERF_FAULT_REPLAY_POLICY_BLOCK = 0,

    // Issue a fault replay after each fault batch has been serviced
    UVM_PERF_FAULT_REPLAY_POLICY_BATCH,

    // Like UVM_PERF_FAULT_REPLAY_POLICY_BATCH but only one batch of faults is serviced. The fault buffer is flushed
    // before issuing the replay. The potential benefit is that we can resume execution of some SMs earlier, if SMs
    // are faulting on different sets of pages.
    UVM_PERF_FAULT_REPLAY_POLICY_BATCH_FLUSH,

    // Issue a fault replay after all faults in the buffer have been serviced
    UVM_PERF_FAULT_REPLAY_POLICY_ONCE,

    // TODO: Bug 1768226: Implement uTLB-aware fault replay policy

    UVM_PERF_FAULT_REPLAY_POLICY_MAX,
} uvm_perf_fault_replay_policy_t;

const char *uvm_perf_fault_replay_policy_string(uvm_perf_fault_replay_policy_t fault_replay);

NV_STATUS uvm_gpu_fault_buffer_init(uvm_parent_gpu_t *parent_gpu);
void uvm_gpu_fault_buffer_deinit(uvm_parent_gpu_t *parent_gpu);

void uvm_gpu_fault_buffer_resume(uvm_parent_gpu_t *parent_gpu);

bool uvm_gpu_replayable_faults_pending(uvm_parent_gpu_t *parent_gpu);

// Clear valid bit for all remaining unserviced faults in the buffer, set GET to
// PUT, and push a fault replay of type UVM_FAULT_REPLAY_TYPE_START. It does not
// wait for the replay to complete before returning. The pushed replay is added
// to the GPU's replay_tracker.
//
// LOCKING: Takes gpu->isr_lock
NV_STATUS uvm_gpu_fault_buffer_flush(uvm_gpu_t *gpu);

// Enable/disable HW support for prefetch-initiated faults
void uvm_gpu_enable_prefetch_faults(uvm_parent_gpu_t *parent_gpu);
void uvm_gpu_disable_prefetch_faults(uvm_parent_gpu_t *parent_gpu);

// Service pending replayable faults on the given GPU. This function must be
// only called from the ISR bottom half
void uvm_gpu_service_replayable_faults(uvm_gpu_t *gpu);

#endif // __UVM_GPU_PAGE_FAULT_H__
