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

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    Copyright (c) 2015-2021 NVIDIA Corporation

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#include "uvm_rm_mem.h"
#include "uvm_test.h"
#include "uvm_test_ioctl.h"
#include "uvm_va_space.h"
#include "uvm_kvmalloc.h"

static NV_STATUS map_cpu(uvm_rm_mem_t *rm_mem)
{
    void *cpu_va;

    // Map
    TEST_NV_CHECK_RET(uvm_rm_mem_map_cpu(rm_mem));
    TEST_CHECK_RET(uvm_rm_mem_mapped_on_cpu(rm_mem));

    // Mapping if already mapped is OK
    TEST_NV_CHECK_RET(uvm_rm_mem_map_cpu(rm_mem));

    // Unmap
    uvm_rm_mem_unmap_cpu(rm_mem);
    // Unmapping already unmapped also OK
    uvm_rm_mem_unmap_cpu(rm_mem);

    // Map again
    TEST_NV_CHECK_RET(uvm_rm_mem_map_cpu(rm_mem));

    cpu_va = uvm_rm_mem_get_cpu_va(rm_mem);
    TEST_CHECK_RET(cpu_va != NULL);

    // Check that the CPU VA is writable.
    // memset and memcpy might cause alignment faults on aarch64.
    // See Bug 2668765 for more details. Since this is a test ioctl and
    // therefore not a critical performance path, it's safe to use memset_io on
    // all platforms.
    memset_io(cpu_va, 0, rm_mem->size);

    return NV_OK;
}

static NV_STATUS map_gpu_owner(uvm_rm_mem_t *rm_mem)
{
    uvm_gpu_t *gpu = rm_mem->gpu_owner;

    // The memory should have been automatically mapped in the GPU owner
    TEST_CHECK_RET(uvm_rm_mem_mapped_on_gpu(rm_mem, gpu));

    // In SR-IOV heavy, there are two VA spaces per GPU, so there are two
    // mappings for a single rm_mem object on a GPU, even if the memory is
    // located in vidmem.
    TEST_CHECK_RET(uvm_rm_mem_mapped_on_gpu_proxy(rm_mem, gpu) == uvm_gpu_uses_proxy_channel_pool(gpu));

    // Explicitly mapping or unmapping to the GPU that owns the allocation is
    // not allowed, so the testing related to GPU owners is simpler than that of
    // other GPUs.
    return NV_OK;
}

static NV_STATUS map_other_gpus(uvm_rm_mem_t *rm_mem, uvm_va_space_t *va_space)
{
    uvm_gpu_t *gpu_owner = rm_mem->gpu_owner;
    uvm_gpu_t *gpu;

    for_each_va_space_gpu(gpu, va_space) {
        if (gpu == gpu_owner)
            continue;

        TEST_NV_CHECK_RET(uvm_rm_mem_map_gpu(rm_mem, gpu));
        TEST_CHECK_RET(uvm_rm_mem_mapped_on_gpu(rm_mem, gpu));

        // Mappings are not ref counted, so additional map calls are no-ops
        TEST_NV_CHECK_RET(uvm_rm_mem_map_gpu(rm_mem, gpu));

        // The previous GPU map calls added mappings to the proxy VA space
        // when in SR-IOV heavy mode
        TEST_CHECK_RET(uvm_rm_mem_mapped_on_gpu_proxy(rm_mem, gpu) == uvm_gpu_uses_proxy_channel_pool(gpu));

        // Unmapping removes all mappings
        uvm_rm_mem_unmap_gpu(rm_mem, gpu);
        TEST_CHECK_RET(!uvm_rm_mem_mapped_on_gpu(rm_mem, gpu));
        TEST_CHECK_RET(!uvm_rm_mem_mapped_on_gpu_proxy(rm_mem, gpu));

        // Additional unmappings are no-ops
        uvm_rm_mem_unmap_gpu(rm_mem, gpu);
        TEST_CHECK_RET(!uvm_rm_mem_mapped_on_gpu(rm_mem, gpu));
        TEST_CHECK_RET(!uvm_rm_mem_mapped_on_gpu_proxy(rm_mem, gpu));

        // Subsequent mappings should behave as they did in the beginning.
        TEST_NV_CHECK_RET(uvm_rm_mem_map_gpu(rm_mem, gpu));
        TEST_CHECK_RET(uvm_rm_mem_mapped_on_gpu(rm_mem, gpu));

        TEST_CHECK_RET(uvm_rm_mem_mapped_on_gpu_proxy(rm_mem, gpu) == uvm_gpu_uses_proxy_channel_pool(gpu));
    }

    return NV_OK;
}

static NV_STATUS test_all_gpus_in_va(uvm_va_space_t *va_space)
{
    uvm_gpu_t *gpu;
    uvm_rm_mem_t *rm_mem = NULL;
    NV_STATUS status = NV_OK;

    // Create allocations of these types
    static const uvm_rm_mem_type_t mem_types[] = { UVM_RM_MEM_TYPE_SYS, UVM_RM_MEM_TYPE_GPU };
    // Create allocations of these sizes
    static const size_t sizes[] = {1, 4, 16, 128, 1024, 4096, 1024 * 1024, 4 * 1024 * 1024};

    uvm_assert_rwsem_locked(&va_space->lock);

    TEST_CHECK_RET(!uvm_processor_mask_empty(&va_space->registered_gpus));

    for_each_va_space_gpu(gpu, va_space) {
        int i, j;

        for (i = 0; i < ARRAY_SIZE(sizes); ++i) {
            for (j = 0; j < ARRAY_SIZE(mem_types); ++j) {

                // Create an allocation in the GPU's address space
                TEST_NV_CHECK_RET(uvm_rm_mem_alloc(gpu, mem_types[j], sizes[i], &rm_mem));

                // Test CPU mappings
                TEST_NV_CHECK_GOTO(map_cpu(rm_mem), error);

                // Test mappings in the GPU owning the allocation
                TEST_NV_CHECK_GOTO(map_gpu_owner(rm_mem), error);

                // For sysmem allocations, test mappings on all other GPUs
                if (rm_mem->type == UVM_RM_MEM_TYPE_SYS)
                    TEST_NV_CHECK_GOTO(map_other_gpus(rm_mem, va_space), error);

                uvm_rm_mem_free(rm_mem);
            }
        }
    }

    return NV_OK;

error:
    uvm_rm_mem_free(rm_mem);

    return status;
}

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

    uvm_va_space_down_read_rm(va_space);

    status = test_all_gpus_in_va(va_space);

    uvm_va_space_up_read_rm(va_space);

    return status;
}