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

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#include "uvm_hal.h"
#include "uvm_hal_types.h"
#include "hwref/hopper/gh100/dev_fault.h"

// TODO: Bug  1835884: [uvm] Query the maximum number of subcontexts from RM
// ... to validate the ve_id
#define MAX_SUBCONTEXTS 64
NvU8 uvm_hal_hopper_fault_buffer_get_ve_id(NvU16 mmu_engine_id, uvm_mmu_engine_type_t mmu_engine_type)
{
    // Only graphics engines can generate MMU faults from different subcontexts
    if (mmu_engine_type == UVM_MMU_ENGINE_TYPE_GRAPHICS) {
        NvU16 ve_id = mmu_engine_id - NV_PFAULT_MMU_ENG_ID_GRAPHICS;
        UVM_ASSERT(ve_id < MAX_SUBCONTEXTS);

        return (NvU8)ve_id;
    }
    else {
        return 0;
    }
}

static bool client_id_ce(NvU16 client_id)
{
    if (client_id >= NV_PFAULT_CLIENT_HUB_HSCE0 && client_id <= NV_PFAULT_CLIENT_HUB_HSCE9)
        return true;

    if (client_id >= NV_PFAULT_CLIENT_HUB_HSCE10 && client_id <= NV_PFAULT_CLIENT_HUB_HSCE15)
        return true;

    switch (client_id) {
        case NV_PFAULT_CLIENT_HUB_CE0:
        case NV_PFAULT_CLIENT_HUB_CE1:
        case NV_PFAULT_CLIENT_HUB_CE2:
        case NV_PFAULT_CLIENT_HUB_CE3:
            return true;
    }

    return false;
}

uvm_mmu_engine_type_t uvm_hal_hopper_fault_buffer_get_mmu_engine_type(NvU16 mmu_engine_id,
                                                                      uvm_fault_client_type_t client_type,
                                                                      NvU16 client_id)
{
    // Servicing CE and Host (HUB clients) faults.
    if (client_type == UVM_FAULT_CLIENT_TYPE_HUB) {
        if (client_id_ce(client_id)) {
            UVM_ASSERT(mmu_engine_id >= NV_PFAULT_MMU_ENG_ID_CE0 && mmu_engine_id <= NV_PFAULT_MMU_ENG_ID_CE9);

            return UVM_MMU_ENGINE_TYPE_CE;
        }

        if (client_id == NV_PFAULT_CLIENT_HUB_HOST || client_id == NV_PFAULT_CLIENT_HUB_ESC) {
            UVM_ASSERT(mmu_engine_id >= NV_PFAULT_MMU_ENG_ID_HOST0 && mmu_engine_id <= NV_PFAULT_MMU_ENG_ID_HOST44);

            return UVM_MMU_ENGINE_TYPE_HOST;
        }
    }

    // We shouldn't be servicing faults from any other engines other than GR.
    UVM_ASSERT_MSG(client_id <= NV_PFAULT_CLIENT_GPC_ROP_3, "Unexpected client ID: 0x%x\n", client_id);
    UVM_ASSERT_MSG(mmu_engine_id >= NV_PFAULT_MMU_ENG_ID_GRAPHICS, "Unexpected engine ID: 0x%x\n", mmu_engine_id);
    UVM_ASSERT(client_type == UVM_FAULT_CLIENT_TYPE_GPC);

    return UVM_MMU_ENGINE_TYPE_GRAPHICS;
}