1 //
2 // Copyright (c) 2017 The Khronos Group Inc.
3 //
4 // Licensed under the Apache License, Version 2.0 (the "License");
5 // you may not use this file except in compliance with the License.
6 // You may obtain a copy of the License at
7 //
8 // http://www.apache.org/licenses/LICENSE-2.0
9 //
10 // Unless required by applicable law or agreed to in writing, software
11 // distributed under the License is distributed on an "AS IS" BASIS,
12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 // See the License for the specific language governing permissions and
14 // limitations under the License.
15 //
16 #include "harness/compat.h"
17
18 #include <stdio.h>
19 #include <stdlib.h>
20 #include <string.h>
21 #include <sys/types.h>
22 #include <sys/stat.h>
23
24
25 #include "procs.h"
26
27 const char *wg_barrier_kernel_code =
28 "__kernel void compute_sum(__global int *a, int n, __global int *tmp_sum, __global int *sum)\n"
29 "{\n"
30 " int tid = get_local_id(0);\n"
31 " int lsize = get_local_size(0);\n"
32 " int i;\n"
33 "\n"
34 " tmp_sum[tid] = 0;\n"
35 " for (i=tid; i<n; i+=lsize)\n"
36 " tmp_sum[tid] += a[i];\n"
37 " \n"
38 " // updated to work for any workgroup size \n"
39 " for (i=hadd(lsize,1); lsize>1; i = hadd(i,1))\n"
40 " {\n"
41 " work_group_barrier(CLK_GLOBAL_MEM_FENCE);\n"
42 " if (tid + i < lsize)\n"
43 " tmp_sum[tid] += tmp_sum[tid + i];\n"
44 " lsize = i; \n"
45 " }\n"
46 "\n"
47 " //no barrier is required here because last person to write to tmp_sum[0] was tid 0 \n"
48 " if (tid == 0)\n"
49 " *sum = tmp_sum[0];\n"
50 "}\n";
51
52
53 static int
verify_sum(int * inptr,int * tmpptr,int * outptr,int n)54 verify_sum(int *inptr, int *tmpptr, int *outptr, int n)
55 {
56 int i;
57 int reference = 0;
58
59 for (i=0; i<n; i++)
60 {
61 reference += inptr[i];
62 }
63
64 if (reference != outptr[0])
65 {
66 log_error("work_group_barrier test failed\n");
67 return -1;
68 }
69
70 log_info("work_group_barrier test passed\n");
71 return 0;
72 }
73
74
75 int
test_wg_barrier(cl_device_id device,cl_context context,cl_command_queue queue,int num_elements)76 test_wg_barrier(cl_device_id device, cl_context context, cl_command_queue queue, int num_elements)
77 {
78 cl_mem streams[3];
79 cl_int *input_ptr = NULL, *output_ptr = NULL, *tmp_ptr =NULL;
80 cl_program program;
81 cl_kernel kernel;
82 size_t global_threads[3];
83 size_t local_threads[3];
84 int err;
85 int i;
86 size_t max_local_workgroup_size[3];
87 size_t max_threadgroup_size = 0;
88 MTdata d;
89
90 err = create_single_kernel_helper_with_build_options(
91 context, &program, &kernel, 1, &wg_barrier_kernel_code, "compute_sum",
92 nullptr);
93 test_error(err, "Failed to build kernel/program.");
94
95 err = clGetKernelWorkGroupInfo(kernel, device, CL_KERNEL_WORK_GROUP_SIZE,
96 sizeof(max_threadgroup_size), &max_threadgroup_size, NULL);
97 test_error(err, "clGetKernelWorkgroupInfo failed.");
98
99 err = clGetDeviceInfo(device, CL_DEVICE_MAX_WORK_ITEM_SIZES, sizeof(max_local_workgroup_size), max_local_workgroup_size, NULL);
100 test_error(err, "clGetDeviceInfo failed for CL_DEVICE_MAX_WORK_ITEM_SIZES");
101
102 // Pick the minimum of the device and the kernel
103 if (max_threadgroup_size > max_local_workgroup_size[0])
104 max_threadgroup_size = max_local_workgroup_size[0];
105
106 // work group size must divide evenly into the global size
107 while( num_elements % max_threadgroup_size )
108 max_threadgroup_size--;
109
110 input_ptr = (int*)malloc(sizeof(int) * num_elements);
111 output_ptr = (int*)malloc(sizeof(int));
112
113 streams[0] = clCreateBuffer(context, CL_MEM_READ_WRITE,
114 sizeof(cl_int) * num_elements, NULL, &err);
115 test_error(err, "clCreateBuffer failed.");
116 streams[1] =
117 clCreateBuffer(context, CL_MEM_READ_WRITE, sizeof(cl_int), NULL, &err);
118 test_error(err, "clCreateBuffer failed.");
119 streams[2] =
120 clCreateBuffer(context, CL_MEM_READ_WRITE,
121 sizeof(cl_int) * max_threadgroup_size, NULL, &err);
122 test_error(err, "clCreateBuffer failed.");
123
124 d = init_genrand( gRandomSeed );
125 for (i=0; i<num_elements; i++)
126 input_ptr[i] = (int)get_random_float(-0x01000000, 0x01000000, d);
127 free_mtdata(d); d = NULL;
128
129 err = clEnqueueWriteBuffer(queue, streams[0], CL_TRUE, 0, sizeof(cl_int)*num_elements, (void *)input_ptr, 0, NULL, NULL);
130 test_error(err, "clEnqueueWriteBuffer failed.");
131
132 err = clSetKernelArg(kernel, 0, sizeof streams[0], &streams[0]);
133 err |= clSetKernelArg(kernel, 1, sizeof num_elements, &num_elements);
134 err |= clSetKernelArg(kernel, 2, sizeof streams[2], &streams[2]);
135 err |= clSetKernelArg(kernel, 3, sizeof streams[1], &streams[1]);
136 test_error(err, "clSetKernelArg failed.");
137
138 global_threads[0] = max_threadgroup_size;
139 local_threads[0] = max_threadgroup_size;
140
141 err = clEnqueueNDRangeKernel( queue, kernel, 1, NULL, global_threads, local_threads, 0, NULL, NULL );
142 test_error(err, "clEnqueueNDRangeKernel failed.");
143
144 err = clEnqueueReadBuffer( queue, streams[1], true, 0, sizeof(cl_int), (void *)output_ptr, 0, NULL, NULL );
145 test_error(err, "clEnqueueReadBuffer failed.");
146
147 err = verify_sum(input_ptr, tmp_ptr, output_ptr, num_elements);
148
149 // cleanup
150 clReleaseMemObject(streams[0]);
151 clReleaseMemObject(streams[1]);
152 clReleaseMemObject(streams[2]);
153 clReleaseKernel(kernel);
154 clReleaseProgram(program);
155 free(input_ptr);
156 free(output_ptr);
157
158 return err;
159 }
160