1 // SPDX-License-Identifier: GPL-2.0
2 
3 #include <dirent.h>
4 #include <errno.h>
5 #include <fcntl.h>
6 #include <stdio.h>
7 #include <stdlib.h>
8 #include <stdint.h>
9 #include <string.h>
10 #include <unistd.h>
11 #include <sys/ioctl.h>
12 #include <sys/mman.h>
13 #include <sys/types.h>
14 
15 #include <linux/dma-buf.h>
16 #include <drm/drm.h>
17 
18 #include "../../../../include/uapi/linux/dma-heap.h"
19 
20 #define DEVPATH "/dev/dma_heap"
21 
22 static int check_vgem(int fd)
23 {
24 	drm_version_t version = { 0 };
25 	char name[5];
26 	int ret;
27 
28 	version.name_len = 4;
29 	version.name = name;
30 
31 	ret = ioctl(fd, DRM_IOCTL_VERSION, &version);
32 	if (ret)
33 		return 0;
34 
35 	return !strcmp(name, "vgem");
36 }
37 
38 static int open_vgem(void)
39 {
40 	int i, fd;
41 	const char *drmstr = "/dev/dri/card";
42 
43 	fd = -1;
44 	for (i = 0; i < 16; i++) {
45 		char name[80];
46 
47 		snprintf(name, 80, "%s%u", drmstr, i);
48 
49 		fd = open(name, O_RDWR);
50 		if (fd < 0)
51 			continue;
52 
53 		if (!check_vgem(fd)) {
54 			close(fd);
55 			fd = -1;
56 			continue;
57 		} else {
58 			break;
59 		}
60 	}
61 	return fd;
62 }
63 
64 static int import_vgem_fd(int vgem_fd, int dma_buf_fd, uint32_t *handle)
65 {
66 	struct drm_prime_handle import_handle = {
67 		.fd = dma_buf_fd,
68 		.flags = 0,
69 		.handle = 0,
70 	 };
71 	int ret;
72 
73 	ret = ioctl(vgem_fd, DRM_IOCTL_PRIME_FD_TO_HANDLE, &import_handle);
74 	if (ret == 0)
75 		*handle = import_handle.handle;
76 	return ret;
77 }
78 
79 static void close_handle(int vgem_fd, uint32_t handle)
80 {
81 	struct drm_gem_close close = {
82 		.handle = handle,
83 	};
84 
85 	ioctl(vgem_fd, DRM_IOCTL_GEM_CLOSE, &close);
86 }
87 
88 static int dmabuf_heap_open(char *name)
89 {
90 	int ret, fd;
91 	char buf[256];
92 
93 	ret = snprintf(buf, 256, "%s/%s", DEVPATH, name);
94 	if (ret < 0) {
95 		printf("snprintf failed!\n");
96 		return ret;
97 	}
98 
99 	fd = open(buf, O_RDWR);
100 	if (fd < 0)
101 		printf("open %s failed!\n", buf);
102 	return fd;
103 }
104 
105 static int dmabuf_heap_alloc_fdflags(int fd, size_t len, unsigned int fd_flags,
106 				     unsigned int heap_flags, int *dmabuf_fd)
107 {
108 	struct dma_heap_allocation_data data = {
109 		.len = len,
110 		.fd = 0,
111 		.fd_flags = fd_flags,
112 		.heap_flags = heap_flags,
113 	};
114 	int ret;
115 
116 	if (!dmabuf_fd)
117 		return -EINVAL;
118 
119 	ret = ioctl(fd, DMA_HEAP_IOCTL_ALLOC, &data);
120 	if (ret < 0)
121 		return ret;
122 	*dmabuf_fd = (int)data.fd;
123 	return ret;
124 }
125 
126 static int dmabuf_heap_alloc(int fd, size_t len, unsigned int flags,
127 			     int *dmabuf_fd)
128 {
129 	return dmabuf_heap_alloc_fdflags(fd, len, O_RDWR | O_CLOEXEC, flags,
130 					 dmabuf_fd);
131 }
132 
133 static int dmabuf_sync(int fd, int start_stop)
134 {
135 	struct dma_buf_sync sync = {
136 		.flags = start_stop | DMA_BUF_SYNC_RW,
137 	};
138 
139 	return ioctl(fd, DMA_BUF_IOCTL_SYNC, &sync);
140 }
141 
142 #define ONE_MEG (1024 * 1024)
143 
144 static int test_alloc_and_import(char *heap_name)
145 {
146 	int heap_fd = -1, dmabuf_fd = -1, importer_fd = -1;
147 	uint32_t handle = 0;
148 	void *p = NULL;
149 	int ret;
150 
151 	heap_fd = dmabuf_heap_open(heap_name);
152 	if (heap_fd < 0)
153 		return -1;
154 
155 	printf("  Testing allocation and importing:  ");
156 	ret = dmabuf_heap_alloc(heap_fd, ONE_MEG, 0, &dmabuf_fd);
157 	if (ret) {
158 		printf("FAIL (Allocation Failed!)\n");
159 		ret = -1;
160 		goto out;
161 	}
162 	/* mmap and write a simple pattern */
163 	p = mmap(NULL,
164 		 ONE_MEG,
165 		 PROT_READ | PROT_WRITE,
166 		 MAP_SHARED,
167 		 dmabuf_fd,
168 		 0);
169 	if (p == MAP_FAILED) {
170 		printf("FAIL (mmap() failed)\n");
171 		ret = -1;
172 		goto out;
173 	}
174 
175 	dmabuf_sync(dmabuf_fd, DMA_BUF_SYNC_START);
176 	memset(p, 1, ONE_MEG / 2);
177 	memset((char *)p + ONE_MEG / 2, 0, ONE_MEG / 2);
178 	dmabuf_sync(dmabuf_fd, DMA_BUF_SYNC_END);
179 
180 	importer_fd = open_vgem();
181 	if (importer_fd < 0) {
182 		ret = importer_fd;
183 		printf("(Could not open vgem - skipping):  ");
184 	} else {
185 		ret = import_vgem_fd(importer_fd, dmabuf_fd, &handle);
186 		if (ret < 0) {
187 			printf("FAIL (Failed to import buffer)\n");
188 			goto out;
189 		}
190 	}
191 
192 	ret = dmabuf_sync(dmabuf_fd, DMA_BUF_SYNC_START);
193 	if (ret < 0) {
194 		printf("FAIL (DMA_BUF_SYNC_START failed!)\n");
195 		goto out;
196 	}
197 
198 	memset(p, 0xff, ONE_MEG);
199 	ret = dmabuf_sync(dmabuf_fd, DMA_BUF_SYNC_END);
200 	if (ret < 0) {
201 		printf("FAIL (DMA_BUF_SYNC_END failed!)\n");
202 		goto out;
203 	}
204 
205 	close_handle(importer_fd, handle);
206 	ret = 0;
207 	printf(" OK\n");
208 out:
209 	if (p)
210 		munmap(p, ONE_MEG);
211 	if (importer_fd >= 0)
212 		close(importer_fd);
213 	if (dmabuf_fd >= 0)
214 		close(dmabuf_fd);
215 	if (heap_fd >= 0)
216 		close(heap_fd);
217 
218 	return ret;
219 }
220 
221 /* Test the ioctl version compatibility w/ a smaller structure then expected */
222 static int dmabuf_heap_alloc_older(int fd, size_t len, unsigned int flags,
223 				   int *dmabuf_fd)
224 {
225 	int ret;
226 	unsigned int older_alloc_ioctl;
227 	struct dma_heap_allocation_data_smaller {
228 		__u64 len;
229 		__u32 fd;
230 		__u32 fd_flags;
231 	} data = {
232 		.len = len,
233 		.fd = 0,
234 		.fd_flags = O_RDWR | O_CLOEXEC,
235 	};
236 
237 	older_alloc_ioctl = _IOWR(DMA_HEAP_IOC_MAGIC, 0x0,
238 				  struct dma_heap_allocation_data_smaller);
239 	if (!dmabuf_fd)
240 		return -EINVAL;
241 
242 	ret = ioctl(fd, older_alloc_ioctl, &data);
243 	if (ret < 0)
244 		return ret;
245 	*dmabuf_fd = (int)data.fd;
246 	return ret;
247 }
248 
249 /* Test the ioctl version compatibility w/ a larger structure then expected */
250 static int dmabuf_heap_alloc_newer(int fd, size_t len, unsigned int flags,
251 				   int *dmabuf_fd)
252 {
253 	int ret;
254 	unsigned int newer_alloc_ioctl;
255 	struct dma_heap_allocation_data_bigger {
256 		__u64 len;
257 		__u32 fd;
258 		__u32 fd_flags;
259 		__u64 heap_flags;
260 		__u64 garbage1;
261 		__u64 garbage2;
262 		__u64 garbage3;
263 	} data = {
264 		.len = len,
265 		.fd = 0,
266 		.fd_flags = O_RDWR | O_CLOEXEC,
267 		.heap_flags = flags,
268 		.garbage1 = 0xffffffff,
269 		.garbage2 = 0x88888888,
270 		.garbage3 = 0x11111111,
271 	};
272 
273 	newer_alloc_ioctl = _IOWR(DMA_HEAP_IOC_MAGIC, 0x0,
274 				  struct dma_heap_allocation_data_bigger);
275 	if (!dmabuf_fd)
276 		return -EINVAL;
277 
278 	ret = ioctl(fd, newer_alloc_ioctl, &data);
279 	if (ret < 0)
280 		return ret;
281 
282 	*dmabuf_fd = (int)data.fd;
283 	return ret;
284 }
285 
286 static int test_alloc_compat(char *heap_name)
287 {
288 	int heap_fd = -1, dmabuf_fd = -1;
289 	int ret;
290 
291 	heap_fd = dmabuf_heap_open(heap_name);
292 	if (heap_fd < 0)
293 		return -1;
294 
295 	printf("  Testing (theoretical)older alloc compat:  ");
296 	ret = dmabuf_heap_alloc_older(heap_fd, ONE_MEG, 0, &dmabuf_fd);
297 	if (ret) {
298 		printf("FAIL (Older compat allocation failed!)\n");
299 		ret = -1;
300 		goto out;
301 	}
302 	close(dmabuf_fd);
303 	printf("OK\n");
304 
305 	printf("  Testing (theoretical)newer alloc compat:  ");
306 	ret = dmabuf_heap_alloc_newer(heap_fd, ONE_MEG, 0, &dmabuf_fd);
307 	if (ret) {
308 		printf("FAIL (Newer compat allocation failed!)\n");
309 		ret = -1;
310 		goto out;
311 	}
312 	printf("OK\n");
313 out:
314 	if (dmabuf_fd >= 0)
315 		close(dmabuf_fd);
316 	if (heap_fd >= 0)
317 		close(heap_fd);
318 
319 	return ret;
320 }
321 
322 static int test_alloc_errors(char *heap_name)
323 {
324 	int heap_fd = -1, dmabuf_fd = -1;
325 	int ret;
326 
327 	heap_fd = dmabuf_heap_open(heap_name);
328 	if (heap_fd < 0)
329 		return -1;
330 
331 	printf("  Testing expected error cases:  ");
332 	ret = dmabuf_heap_alloc(0, ONE_MEG, 0x111111, &dmabuf_fd);
333 	if (!ret) {
334 		printf("FAIL (Did not see expected error (invalid fd)!)\n");
335 		ret = -1;
336 		goto out;
337 	}
338 
339 	ret = dmabuf_heap_alloc(heap_fd, ONE_MEG, 0x111111, &dmabuf_fd);
340 	if (!ret) {
341 		printf("FAIL (Did not see expected error (invalid heap flags)!)\n");
342 		ret = -1;
343 		goto out;
344 	}
345 
346 	ret = dmabuf_heap_alloc_fdflags(heap_fd, ONE_MEG,
347 					~(O_RDWR | O_CLOEXEC), 0, &dmabuf_fd);
348 	if (!ret) {
349 		printf("FAIL (Did not see expected error (invalid fd flags)!)\n");
350 		ret = -1;
351 		goto out;
352 	}
353 
354 	printf("OK\n");
355 	ret = 0;
356 out:
357 	if (dmabuf_fd >= 0)
358 		close(dmabuf_fd);
359 	if (heap_fd >= 0)
360 		close(heap_fd);
361 
362 	return ret;
363 }
364 
365 int main(void)
366 {
367 	DIR *d;
368 	struct dirent *dir;
369 	int ret = -1;
370 
371 	d = opendir(DEVPATH);
372 	if (!d) {
373 		printf("No %s directory?\n", DEVPATH);
374 		return -1;
375 	}
376 
377 	while ((dir = readdir(d)) != NULL) {
378 		if (!strncmp(dir->d_name, ".", 2))
379 			continue;
380 		if (!strncmp(dir->d_name, "..", 3))
381 			continue;
382 
383 		printf("Testing heap: %s\n", dir->d_name);
384 		printf("=======================================\n");
385 		ret = test_alloc_and_import(dir->d_name);
386 		if (ret)
387 			break;
388 
389 		ret = test_alloc_compat(dir->d_name);
390 		if (ret)
391 			break;
392 
393 		ret = test_alloc_errors(dir->d_name);
394 		if (ret)
395 			break;
396 	}
397 	closedir(d);
398 
399 	return ret;
400 }
401