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

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    Copyright (c) 2015-2019 NVIDIA Corporation

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#include "uvm_global.h"
#include "uvm_gpu_semaphore.h"
#include "uvm_test.h"
#include "uvm_va_space.h"
#include "uvm_kvmalloc.h"

static NV_STATUS add_and_test(uvm_gpu_tracking_semaphore_t *tracking_sem, NvU32 increment_by)
{
    NvU64 new_value;
    NvU64 completed = uvm_gpu_tracking_semaphore_update_completed_value(tracking_sem);
    new_value = completed + increment_by;
    tracking_sem->queued_value = new_value;

    TEST_CHECK_RET(uvm_gpu_tracking_semaphore_update_completed_value(tracking_sem) == completed);
    TEST_CHECK_RET(uvm_gpu_tracking_semaphore_is_value_completed(tracking_sem, 0));
    if (completed > 0)
        TEST_CHECK_RET(uvm_gpu_tracking_semaphore_is_value_completed(tracking_sem, completed - 1));
    TEST_CHECK_RET(uvm_gpu_tracking_semaphore_is_value_completed(tracking_sem, completed));
    TEST_CHECK_RET(!uvm_gpu_tracking_semaphore_is_value_completed(tracking_sem, completed + 1));
    TEST_CHECK_RET(!uvm_gpu_tracking_semaphore_is_value_completed(tracking_sem, new_value));
    TEST_CHECK_RET(!uvm_gpu_tracking_semaphore_is_completed(tracking_sem));

    uvm_gpu_semaphore_set_payload(&tracking_sem->semaphore, (NvU32)new_value);
    TEST_CHECK_RET(uvm_gpu_tracking_semaphore_update_completed_value(tracking_sem) == new_value);
    TEST_CHECK_RET(uvm_gpu_tracking_semaphore_is_value_completed(tracking_sem, completed));
    TEST_CHECK_RET(uvm_gpu_tracking_semaphore_is_value_completed(tracking_sem, new_value));
    TEST_CHECK_RET(uvm_gpu_tracking_semaphore_is_value_completed(tracking_sem, new_value - 1));
    TEST_CHECK_RET(!uvm_gpu_tracking_semaphore_is_value_completed(tracking_sem, new_value + 1));
    TEST_CHECK_RET(uvm_gpu_tracking_semaphore_is_completed(tracking_sem));

    return NV_OK;
}

static NV_STATUS test_tracking(uvm_va_space_t *va_space)
{
    NV_STATUS status;
    uvm_gpu_tracking_semaphore_t tracking_sem;
    int i;
    uvm_gpu_t *gpu = uvm_va_space_find_first_gpu(va_space);

    if (gpu == NULL)
        return NV_ERR_INVALID_STATE;

    status = uvm_gpu_tracking_semaphore_alloc(gpu->semaphore_pool, &tracking_sem);
    if (status != NV_OK)
        return status;

    status = add_and_test(&tracking_sem, 1);
    if (status != NV_OK)
        goto done;

    for (i = 0; i < 100; ++i) {
        status = add_and_test(&tracking_sem, UINT_MAX - 1);
        if (status != NV_OK)
            goto done;
    }

done:
    uvm_gpu_tracking_semaphore_free(&tracking_sem);
    return status;
}

#define NUM_SEMAPHORES_PER_GPU 4096

static NV_STATUS test_alloc(uvm_va_space_t *va_space)
{
    NV_STATUS status = NV_OK;
    uvm_gpu_t *gpu;
    uvm_gpu_semaphore_t *semaphores;
    int i;
    NvU32 semaphore_count;
    NvU32 gpu_count = uvm_processor_mask_get_gpu_count(&va_space->registered_gpus);
    NvU32 current_semaphore = 0;

    if (gpu_count == 0)
        return NV_ERR_INVALID_STATE;

    semaphore_count = gpu_count * NUM_SEMAPHORES_PER_GPU;

    semaphores = uvm_kvmalloc_zero(semaphore_count * sizeof(*semaphores));
    if (semaphores == NULL)
        return NV_ERR_NO_MEMORY;

    for (i = 0; i < NUM_SEMAPHORES_PER_GPU; ++i) {
        for_each_va_space_gpu(gpu, va_space) {
            status = uvm_gpu_semaphore_alloc(gpu->semaphore_pool, &semaphores[current_semaphore++]);
            if (status != NV_OK)
                goto done;
        }
    }

    for (i = 0; i < current_semaphore; ++i) {
        for_each_va_space_gpu(gpu, va_space) {
            NvU64 gpu_va;

            gpu_va = uvm_gpu_semaphore_get_gpu_uvm_va(&semaphores[i], gpu);
            TEST_CHECK_GOTO(gpu_va != 0, done);

            // In SR-IOV heavy, there should be a mapping in the proxy VA space
            // too.
            if (uvm_gpu_uses_proxy_channel_pool(gpu)) {
                gpu_va = uvm_gpu_semaphore_get_gpu_proxy_va(&semaphores[i], gpu);
                TEST_CHECK_GOTO(gpu_va != 0, done);
            }

            uvm_gpu_semaphore_set_payload(&semaphores[i], 1);
            TEST_CHECK_GOTO(uvm_gpu_semaphore_get_payload(&semaphores[i]) == 1, done);
        }
    }

done:
    for (i = 0; i < current_semaphore; ++i)
        uvm_gpu_semaphore_free(&semaphores[i]);

    uvm_kvfree(semaphores);

    return status;
}


NV_STATUS uvm_test_gpu_semaphore_sanity(UVM_TEST_GPU_SEMAPHORE_SANITY_PARAMS *params, struct file *filp)
{
    NV_STATUS status;
    uvm_va_space_t *va_space = uvm_va_space_get(filp);

    uvm_mutex_lock(&g_uvm_global.global_lock);
    uvm_va_space_down_read_rm(va_space);

    status = test_alloc(va_space);
    if (status != NV_OK)
        goto done;

    status = test_tracking(va_space);
    if (status != NV_OK)
        goto done;

done:
    uvm_va_space_up_read_rm(va_space);
    uvm_mutex_unlock(&g_uvm_global.global_lock);

    return status;
}