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

/*******************************************************************************
    Copyright (c) 2021-2022 NVIDIA Corporation

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        The above copyright notice and this permission notice shall be
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    FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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#include "uvm_common.h"
#include "uvm_linux.h"
#include "uvm_test.h"
#include "uvm_va_space.h"
#include "uvm_va_range.h"
#include "uvm_hmm.h"

NV_STATUS uvm_test_hmm_sanity(UVM_TEST_HMM_SANITY_PARAMS *params, struct file *filp)
{
    uvm_va_space_t *va_space = uvm_va_space_get(filp);
    struct mm_struct *mm;
    uvm_va_block_t *hmm_block = NULL;
    NV_STATUS status;

    mm = uvm_va_space_mm_or_current_retain(va_space);
    if (!mm)
        return NV_WARN_NOTHING_TO_DO;

    uvm_down_write_mmap_lock(mm);
    uvm_va_space_down_write(va_space);

    // TODO: Bug 3351822: [UVM-HMM] Remove temporary testing changes.
    // By default, HMM is enabled system wide but disabled per va_space.
    // This will initialize the va_space for HMM.
    status = uvm_hmm_va_space_initialize_test(va_space);
    if (status != NV_OK)
        goto out;

    uvm_va_space_up_write(va_space);
    uvm_up_write_mmap_lock(mm);

    uvm_down_read_mmap_lock(mm);
    uvm_va_space_down_read(va_space);

    // Try to create an HMM va_block to virtual address zero (NULL).
    // It should fail. There should be no VMA but a va_block for range
    // [0x0 0x1fffff] is possible.
    status = uvm_hmm_va_block_find_create(va_space, 0UL, NULL, &hmm_block);
    TEST_CHECK_GOTO(status == NV_ERR_INVALID_ADDRESS, done);

    // Try to create an HMM va_block which overlaps a managed block.
    // It should fail.
    status = uvm_hmm_va_block_find_create(va_space, params->uvm_address, NULL, &hmm_block);
    TEST_CHECK_GOTO(status == NV_ERR_INVALID_ADDRESS, done);

    // Try to create an HMM va_block; it should succeed.
    status = uvm_hmm_va_block_find_create(va_space, params->hmm_address, NULL, &hmm_block);
    TEST_CHECK_GOTO(status == NV_OK, done);

    // Try to find an existing HMM va_block; it should succeed.
    status = uvm_hmm_va_block_find(va_space, params->hmm_address, &hmm_block);
    TEST_CHECK_GOTO(status == NV_OK, done);

done:
    uvm_va_space_up_read(va_space);
    uvm_up_read_mmap_lock(mm);
    uvm_va_space_mm_or_current_release(va_space, mm);

    return status;

out:
    uvm_va_space_up_write(va_space);
    uvm_up_write_mmap_lock(mm);
    uvm_va_space_mm_or_current_release(va_space, mm);

    return status;
}