nvidia-open-gpu-kernel-modules/kernel-open/nvidia-uvm/uvm_ampere.c

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    Copyright (c) 2018-2023 NVIDIA Corporation

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#include "uvm_global.h"
#include "uvm_hal.h"
#include "uvm_gpu.h"
#include "uvm_mem.h"
#include "uvm_ampere_fault_buffer.h"

void uvm_hal_ampere_arch_init_properties(uvm_parent_gpu_t *parent_gpu)
{
    parent_gpu->tlb_batch.va_invalidate_supported = true;

    parent_gpu->tlb_batch.va_range_invalidate_supported = true;

    // TODO: Bug 1767241: Run benchmarks to figure out a good number
    parent_gpu->tlb_batch.max_ranges = 8;

    parent_gpu->utlb_per_gpc_count = uvm_ampere_get_utlbs_per_gpc(parent_gpu);

    parent_gpu->fault_buffer_info.replayable.utlb_count = parent_gpu->rm_info.maxGpcCount *
                                                          parent_gpu->utlb_per_gpc_count;
    {
        uvm_fault_buffer_entry_t *dummy;
        UVM_ASSERT(parent_gpu->fault_buffer_info.replayable.utlb_count <= (1 <<
                                                                           (sizeof(dummy->fault_source.utlb_id) * 8)));
    }

    // A single top level PDE on Ampere covers 128 TB and that's the minimum
    // size that can be used.
    parent_gpu->rm_va_base = 0;
    parent_gpu->rm_va_size = 128 * UVM_SIZE_1TB;

    parent_gpu->uvm_mem_va_base = 384 * UVM_SIZE_1TB;
    parent_gpu->uvm_mem_va_size = UVM_MEM_VA_SIZE;

    // See uvm_mmu.h for mapping placement
    parent_gpu->flat_vidmem_va_base = 160 * UVM_SIZE_1TB;
    parent_gpu->flat_sysmem_va_base = 256 * UVM_SIZE_1TB;

    parent_gpu->ce_phys_vidmem_write_supported = true;

    parent_gpu->peer_copy_mode = g_uvm_global.peer_copy_mode;

    // Not all units on Ampere support 49-bit addressing, including those which
    // access channel buffers.
    parent_gpu->max_channel_va = 1ULL << 40;

    parent_gpu->max_host_va = 1ULL << 40;

    // Ampere can map sysmem with any page size
    parent_gpu->can_map_sysmem_with_large_pages = true;

    // Prefetch instructions will generate faults
    parent_gpu->prefetch_fault_supported = true;

    // Ampere can place GPFIFO in vidmem
    parent_gpu->gpfifo_in_vidmem_supported = true;

    parent_gpu->replayable_faults_supported = true;

    parent_gpu->non_replayable_faults_supported = true;

    parent_gpu->access_counters_supported = true;

    parent_gpu->access_counters_can_use_physical_addresses = false;

    parent_gpu->fault_cancel_va_supported = true;

    parent_gpu->scoped_atomics_supported = true;

    parent_gpu->has_clear_faulted_channel_sw_method = true;

    parent_gpu->has_clear_faulted_channel_method = false;

    parent_gpu->smc.supported = true;

    parent_gpu->sparse_mappings_supported = true;

    UVM_ASSERT(parent_gpu->rm_info.gpuArch == NV2080_CTRL_MC_ARCH_INFO_ARCHITECTURE_GA100);
    if (parent_gpu->rm_info.gpuImplementation == NV2080_CTRL_MC_ARCH_INFO_IMPLEMENTATION_GA100 ||
        parent_gpu->rm_info.gpuImplementation == NV2080_CTRL_MC_ARCH_INFO_IMPLEMENTATION_GA000)
        parent_gpu->map_remap_larger_page_promotion = true;
    else
        parent_gpu->map_remap_larger_page_promotion = false;

    parent_gpu->plc_supported = true;

    parent_gpu->no_ats_range_required = false;
}