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| 1 | +/* |
| 2 | + * |
| 3 | + * Copyright (C) 2024 Intel Corporation |
| 4 | + * |
| 5 | + * Under the Apache License v2.0 with LLVM Exceptions. See LICENSE.TXT. |
| 6 | + * SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 7 | + * |
| 8 | + */ |
| 9 | + |
| 10 | +#include <assert.h> |
| 11 | +#include <stdio.h> |
| 12 | +#include <stdlib.h> |
| 13 | +#include <ze_api.h> |
| 14 | + |
| 15 | +#include "umf/memory_pool.h" |
| 16 | +#include "umf/pools/pool_disjoint.h" |
| 17 | +#include "umf/providers/provider_level_zero.h" |
| 18 | + |
| 19 | +// This function initializes the Level Zero driver and creates a context in the |
| 20 | +// first GPU device found. |
| 21 | +int level_zero_init(ze_driver_handle_t *driver, ze_device_handle_t *device, |
| 22 | + ze_context_handle_t *context) { |
| 23 | + |
| 24 | + // Initialize the Level Zero driver |
| 25 | + ze_result_t ze_result = zeInit(0); |
| 26 | + assert(ze_result == ZE_RESULT_SUCCESS); |
| 27 | + |
| 28 | + // Discover all the driver instances |
| 29 | + uint32_t driverCount = 0; |
| 30 | + ze_result = zeDriverGet(&driverCount, NULL); |
| 31 | + assert(ze_result == ZE_RESULT_SUCCESS); |
| 32 | + assert(driverCount > 0); |
| 33 | + |
| 34 | + ze_driver_handle_t *all_drivers = |
| 35 | + (ze_driver_handle_t *)calloc(driverCount, sizeof(ze_driver_handle_t)); |
| 36 | + ze_result = zeDriverGet(&driverCount, all_drivers); |
| 37 | + assert(ze_result == ZE_RESULT_SUCCESS); |
| 38 | + |
| 39 | + // Find a driver instance with a GPU device |
| 40 | + for (uint32_t i = 0; i < driverCount; ++i) { |
| 41 | + assert(all_drivers[i] != NULL); |
| 42 | + |
| 43 | + // Discover all the devices |
| 44 | + uint32_t deviceCount = 0; |
| 45 | + ze_result = zeDeviceGet(all_drivers[i], &deviceCount, NULL); |
| 46 | + assert(ze_result == ZE_RESULT_SUCCESS); |
| 47 | + assert(deviceCount > 0); |
| 48 | + |
| 49 | + ze_device_handle_t *all_devices = (ze_device_handle_t *)calloc( |
| 50 | + deviceCount, sizeof(ze_device_handle_t)); |
| 51 | + ze_result = zeDeviceGet(all_drivers[i], &deviceCount, all_devices); |
| 52 | + assert(ze_result == ZE_RESULT_SUCCESS); |
| 53 | + |
| 54 | + // Loop through the devices to find a GPU device |
| 55 | + for (uint32_t d = 0; d < deviceCount; ++d) { |
| 56 | + assert(all_devices[d] != NULL); |
| 57 | + |
| 58 | + ze_device_properties_t device_properties = {0}; |
| 59 | + device_properties.stype = ZE_STRUCTURE_TYPE_DEVICE_PROPERTIES; |
| 60 | + ze_result = |
| 61 | + zeDeviceGetProperties(all_devices[d], &device_properties); |
| 62 | + assert(ze_result == ZE_RESULT_SUCCESS); |
| 63 | + |
| 64 | + if (ZE_DEVICE_TYPE_GPU == device_properties.type) { |
| 65 | + *driver = all_drivers[i]; |
| 66 | + *device = all_devices[d]; |
| 67 | + printf("GPU device found: %p\n", device); |
| 68 | + break; |
| 69 | + } |
| 70 | + } |
| 71 | + |
| 72 | + free(all_devices); |
| 73 | + if (NULL != driver) { |
| 74 | + break; |
| 75 | + } |
| 76 | + } |
| 77 | + |
| 78 | + // In case no suitable device was found, print an error message and exit |
| 79 | + if (NULL == device) { |
| 80 | + printf("Failed to find GPU device!"); |
| 81 | + return -1; |
| 82 | + } |
| 83 | + |
| 84 | + // Create context |
| 85 | + ze_context_desc_t ctxtDesc = {ZE_STRUCTURE_TYPE_CONTEXT_DESC, NULL, 0}; |
| 86 | + ze_result = zeContextCreate(*driver, &ctxtDesc, context); |
| 87 | + assert(ze_result == ZE_RESULT_SUCCESS); |
| 88 | + assert(*context != NULL); |
| 89 | + |
| 90 | + // Free the memory |
| 91 | + free(all_drivers); |
| 92 | + return 0; |
| 93 | +} |
| 94 | + |
| 95 | +int main(void) { |
| 96 | + |
| 97 | + // A result object for storing UMF API result status |
| 98 | + umf_result_t res; |
| 99 | + |
| 100 | + // Initialize Level Zero |
| 101 | + ze_driver_handle_t hDriver; |
| 102 | + ze_device_handle_t hDevice; |
| 103 | + ze_context_handle_t hContext; |
| 104 | + int ret = level_zero_init(&hDriver, &hDevice, &hContext); |
| 105 | + if (ret < 0) { |
| 106 | + // Initialization failed or no GPU devices was found |
| 107 | + return -1; |
| 108 | + } |
| 109 | + |
| 110 | + // Setup parameters for the Level Zero memory provider. It will be used for |
| 111 | + // allocating memory from Level Zero devices. |
| 112 | + level_zero_memory_provider_params_t ze_memory_provider_params; |
| 113 | + ze_memory_provider_params.level_zero_context_handle = hContext; |
| 114 | + ze_memory_provider_params.level_zero_device_handle = hDevice; |
| 115 | + // Set the memory type to shared to allow the memory to be accessed on both |
| 116 | + // CPU and GPU. |
| 117 | + ze_memory_provider_params.memory_type = UMF_MEMORY_TYPE_SHARED; |
| 118 | + |
| 119 | + // Create Level Zero memory provider |
| 120 | + umf_memory_provider_handle_t ze_memory_provider; |
| 121 | + res = umfMemoryProviderCreate(umfLevelZeroMemoryProviderOps(), |
| 122 | + &ze_memory_provider_params, |
| 123 | + &ze_memory_provider); |
| 124 | + if (res != UMF_RESULT_SUCCESS) { |
| 125 | + printf("Failed to create a memory provider!"); |
| 126 | + goto level_zero_destroy; |
| 127 | + } |
| 128 | + |
| 129 | + printf("Level Zero memory provider created at %p\n", |
| 130 | + (void *)ze_memory_provider); |
| 131 | + |
| 132 | + // Setup parametes for the Disjoint Pool. It will be used for managing the |
| 133 | + // memory allocated using memory provider. |
| 134 | + umf_disjoint_pool_params_t disjoint_memory_pool_params = |
| 135 | + umfDisjointPoolParamsDefault(); |
| 136 | + // Set the Slab Min Size to 64KB - the page size for GPU allocations |
| 137 | + disjoint_memory_pool_params.SlabMinSize = 64 * 1024L; |
| 138 | + // We would keep only single slab per each allocation bucket |
| 139 | + disjoint_memory_pool_params.Capacity = 1; |
| 140 | + // Set the maximum poolable size to 64KB - objects with size above this |
| 141 | + // limit will not be stored/allocated from the pool. |
| 142 | + disjoint_memory_pool_params.MaxPoolableSize = 64 * 1024L; |
| 143 | + // Enable tracing |
| 144 | + disjoint_memory_pool_params.PoolTrace = 1; |
| 145 | + |
| 146 | + // Create Disjoint Pool memory pool. |
| 147 | + umf_memory_pool_handle_t ze_disjoint_memory_pool; |
| 148 | + res = umfPoolCreate(umfDisjointPoolOps(), ze_memory_provider, |
| 149 | + &disjoint_memory_pool_params, UMF_POOL_CREATE_FLAG_NONE, |
| 150 | + &ze_disjoint_memory_pool); |
| 151 | + if (res != UMF_RESULT_SUCCESS) { |
| 152 | + printf("Failed to create a memory pool!"); |
| 153 | + goto memory_provider_destroy; |
| 154 | + } |
| 155 | + |
| 156 | + printf("Disjoint Pool created at %p\n", (void *)ze_disjoint_memory_pool); |
| 157 | + |
| 158 | + // Allocate some memory from the pool |
| 159 | + void *ptr = umfPoolMalloc(ze_disjoint_memory_pool, sizeof(int)); |
| 160 | + if (res != UMF_RESULT_SUCCESS) { |
| 161 | + printf("Failed to allocate memory from the memory pool!"); |
| 162 | + goto memory_pool_destroy; |
| 163 | + } |
| 164 | + |
| 165 | + // Use allocated memory |
| 166 | + *(int *)ptr = 1; |
| 167 | + |
| 168 | + // Free allocated memory |
| 169 | + res = umfFree(ptr); |
| 170 | + if (res != UMF_RESULT_SUCCESS) { |
| 171 | + printf("Failed to free memory to the pool!"); |
| 172 | + goto memory_pool_destroy; |
| 173 | + } |
| 174 | + printf("Freed memory at %p\n", ptr); |
| 175 | + |
| 176 | + // Cleanup |
| 177 | + umfPoolDestroy(ze_disjoint_memory_pool); |
| 178 | + umfMemoryProviderDestroy(ze_memory_provider); |
| 179 | + zeContextDestroy(hContext); |
| 180 | + return 0; |
| 181 | + |
| 182 | +memory_pool_destroy: |
| 183 | + umfPoolDestroy(ze_disjoint_memory_pool); |
| 184 | + |
| 185 | +memory_provider_destroy: |
| 186 | + umfMemoryProviderDestroy(ze_memory_provider); |
| 187 | + |
| 188 | +level_zero_destroy: |
| 189 | + zeContextDestroy(hContext); |
| 190 | + return -1; |
| 191 | +} |
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