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 
check_vgem(int fd)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 
open_vgem(void)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 
import_vgem_fd(int vgem_fd,int dma_buf_fd,uint32_t * handle)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 
close_handle(int vgem_fd,uint32_t handle)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 
dmabuf_heap_open(char * name)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 
dmabuf_heap_alloc_fdflags(int fd,size_t len,unsigned int fd_flags,unsigned int heap_flags,int * dmabuf_fd)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 
dmabuf_heap_alloc(int fd,size_t len,unsigned int flags,int * dmabuf_fd)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 
dmabuf_sync(int fd,int start_stop)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 
test_alloc_and_import(char * heap_name)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 
test_alloc_zeroed(char * heap_name,size_t size)221 static int test_alloc_zeroed(char *heap_name, size_t size)
222 {
223 	int heap_fd = -1, dmabuf_fd[32];
224 	int i, j, ret;
225 	void *p = NULL;
226 	char *c;
227 
228 	printf("  Testing alloced %ldk buffers are zeroed:  ", size / 1024);
229 	heap_fd = dmabuf_heap_open(heap_name);
230 	if (heap_fd < 0)
231 		return -1;
232 
233 	/* Allocate and fill a bunch of buffers */
234 	for (i = 0; i < 32; i++) {
235 		ret = dmabuf_heap_alloc(heap_fd, size, 0, &dmabuf_fd[i]);
236 		if (ret < 0) {
237 			printf("FAIL (Allocation (%i) failed)\n", i);
238 			goto out;
239 		}
240 		/* mmap and fill with simple pattern */
241 		p = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, dmabuf_fd[i], 0);
242 		if (p == MAP_FAILED) {
243 			printf("FAIL (mmap() failed!)\n");
244 			ret = -1;
245 			goto out;
246 		}
247 		dmabuf_sync(dmabuf_fd[i], DMA_BUF_SYNC_START);
248 		memset(p, 0xff, size);
249 		dmabuf_sync(dmabuf_fd[i], DMA_BUF_SYNC_END);
250 		munmap(p, size);
251 	}
252 	/* close them all */
253 	for (i = 0; i < 32; i++)
254 		close(dmabuf_fd[i]);
255 
256 	/* Allocate and validate all buffers are zeroed */
257 	for (i = 0; i < 32; i++) {
258 		ret = dmabuf_heap_alloc(heap_fd, size, 0, &dmabuf_fd[i]);
259 		if (ret < 0) {
260 			printf("FAIL (Allocation (%i) failed)\n", i);
261 			goto out;
262 		}
263 
264 		/* mmap and validate everything is zero */
265 		p = mmap(NULL, size, PROT_READ | PROT_WRITE, MAP_SHARED, dmabuf_fd[i], 0);
266 		if (p == MAP_FAILED) {
267 			printf("FAIL (mmap() failed!)\n");
268 			ret = -1;
269 			goto out;
270 		}
271 		dmabuf_sync(dmabuf_fd[i], DMA_BUF_SYNC_START);
272 		c = (char *)p;
273 		for (j = 0; j < size; j++) {
274 			if (c[j] != 0) {
275 				printf("FAIL (Allocated buffer not zeroed @ %i)\n", j);
276 				break;
277 			}
278 		}
279 		dmabuf_sync(dmabuf_fd[i], DMA_BUF_SYNC_END);
280 		munmap(p, size);
281 	}
282 	/* close them all */
283 	for (i = 0; i < 32; i++)
284 		close(dmabuf_fd[i]);
285 
286 	close(heap_fd);
287 	printf("OK\n");
288 	return 0;
289 
290 out:
291 	while (i > 0) {
292 		close(dmabuf_fd[i]);
293 		i--;
294 	}
295 	close(heap_fd);
296 	return ret;
297 }
298 
299 /* Test the ioctl version compatibility w/ a smaller structure then expected */
dmabuf_heap_alloc_older(int fd,size_t len,unsigned int flags,int * dmabuf_fd)300 static int dmabuf_heap_alloc_older(int fd, size_t len, unsigned int flags,
301 				   int *dmabuf_fd)
302 {
303 	int ret;
304 	unsigned int older_alloc_ioctl;
305 	struct dma_heap_allocation_data_smaller {
306 		__u64 len;
307 		__u32 fd;
308 		__u32 fd_flags;
309 	} data = {
310 		.len = len,
311 		.fd = 0,
312 		.fd_flags = O_RDWR | O_CLOEXEC,
313 	};
314 
315 	older_alloc_ioctl = _IOWR(DMA_HEAP_IOC_MAGIC, 0x0,
316 				  struct dma_heap_allocation_data_smaller);
317 	if (!dmabuf_fd)
318 		return -EINVAL;
319 
320 	ret = ioctl(fd, older_alloc_ioctl, &data);
321 	if (ret < 0)
322 		return ret;
323 	*dmabuf_fd = (int)data.fd;
324 	return ret;
325 }
326 
327 /* Test the ioctl version compatibility w/ a larger structure then expected */
dmabuf_heap_alloc_newer(int fd,size_t len,unsigned int flags,int * dmabuf_fd)328 static int dmabuf_heap_alloc_newer(int fd, size_t len, unsigned int flags,
329 				   int *dmabuf_fd)
330 {
331 	int ret;
332 	unsigned int newer_alloc_ioctl;
333 	struct dma_heap_allocation_data_bigger {
334 		__u64 len;
335 		__u32 fd;
336 		__u32 fd_flags;
337 		__u64 heap_flags;
338 		__u64 garbage1;
339 		__u64 garbage2;
340 		__u64 garbage3;
341 	} data = {
342 		.len = len,
343 		.fd = 0,
344 		.fd_flags = O_RDWR | O_CLOEXEC,
345 		.heap_flags = flags,
346 		.garbage1 = 0xffffffff,
347 		.garbage2 = 0x88888888,
348 		.garbage3 = 0x11111111,
349 	};
350 
351 	newer_alloc_ioctl = _IOWR(DMA_HEAP_IOC_MAGIC, 0x0,
352 				  struct dma_heap_allocation_data_bigger);
353 	if (!dmabuf_fd)
354 		return -EINVAL;
355 
356 	ret = ioctl(fd, newer_alloc_ioctl, &data);
357 	if (ret < 0)
358 		return ret;
359 
360 	*dmabuf_fd = (int)data.fd;
361 	return ret;
362 }
363 
test_alloc_compat(char * heap_name)364 static int test_alloc_compat(char *heap_name)
365 {
366 	int heap_fd = -1, dmabuf_fd = -1;
367 	int ret;
368 
369 	heap_fd = dmabuf_heap_open(heap_name);
370 	if (heap_fd < 0)
371 		return -1;
372 
373 	printf("  Testing (theoretical)older alloc compat:  ");
374 	ret = dmabuf_heap_alloc_older(heap_fd, ONE_MEG, 0, &dmabuf_fd);
375 	if (ret) {
376 		printf("FAIL (Older compat allocation failed!)\n");
377 		ret = -1;
378 		goto out;
379 	}
380 	close(dmabuf_fd);
381 	printf("OK\n");
382 
383 	printf("  Testing (theoretical)newer alloc compat:  ");
384 	ret = dmabuf_heap_alloc_newer(heap_fd, ONE_MEG, 0, &dmabuf_fd);
385 	if (ret) {
386 		printf("FAIL (Newer compat allocation failed!)\n");
387 		ret = -1;
388 		goto out;
389 	}
390 	printf("OK\n");
391 out:
392 	if (dmabuf_fd >= 0)
393 		close(dmabuf_fd);
394 	if (heap_fd >= 0)
395 		close(heap_fd);
396 
397 	return ret;
398 }
399 
test_alloc_errors(char * heap_name)400 static int test_alloc_errors(char *heap_name)
401 {
402 	int heap_fd = -1, dmabuf_fd = -1;
403 	int ret;
404 
405 	heap_fd = dmabuf_heap_open(heap_name);
406 	if (heap_fd < 0)
407 		return -1;
408 
409 	printf("  Testing expected error cases:  ");
410 	ret = dmabuf_heap_alloc(0, ONE_MEG, 0x111111, &dmabuf_fd);
411 	if (!ret) {
412 		printf("FAIL (Did not see expected error (invalid fd)!)\n");
413 		ret = -1;
414 		goto out;
415 	}
416 
417 	ret = dmabuf_heap_alloc(heap_fd, ONE_MEG, 0x111111, &dmabuf_fd);
418 	if (!ret) {
419 		printf("FAIL (Did not see expected error (invalid heap flags)!)\n");
420 		ret = -1;
421 		goto out;
422 	}
423 
424 	ret = dmabuf_heap_alloc_fdflags(heap_fd, ONE_MEG,
425 					~(O_RDWR | O_CLOEXEC), 0, &dmabuf_fd);
426 	if (!ret) {
427 		printf("FAIL (Did not see expected error (invalid fd flags)!)\n");
428 		ret = -1;
429 		goto out;
430 	}
431 
432 	printf("OK\n");
433 	ret = 0;
434 out:
435 	if (dmabuf_fd >= 0)
436 		close(dmabuf_fd);
437 	if (heap_fd >= 0)
438 		close(heap_fd);
439 
440 	return ret;
441 }
442 
main(void)443 int main(void)
444 {
445 	DIR *d;
446 	struct dirent *dir;
447 	int ret = -1;
448 
449 	d = opendir(DEVPATH);
450 	if (!d) {
451 		printf("No %s directory?\n", DEVPATH);
452 		return -1;
453 	}
454 
455 	while ((dir = readdir(d)) != NULL) {
456 		if (!strncmp(dir->d_name, ".", 2))
457 			continue;
458 		if (!strncmp(dir->d_name, "..", 3))
459 			continue;
460 
461 		printf("Testing heap: %s\n", dir->d_name);
462 		printf("=======================================\n");
463 		ret = test_alloc_and_import(dir->d_name);
464 		if (ret)
465 			break;
466 
467 		ret = test_alloc_zeroed(dir->d_name, 4 * 1024);
468 		if (ret)
469 			break;
470 
471 		ret = test_alloc_zeroed(dir->d_name, ONE_MEG);
472 		if (ret)
473 			break;
474 
475 		ret = test_alloc_compat(dir->d_name);
476 		if (ret)
477 			break;
478 
479 		ret = test_alloc_errors(dir->d_name);
480 		if (ret)
481 			break;
482 	}
483 	closedir(d);
484 
485 	return ret;
486 }
487