1 // SPDX-License-Identifier: GPL-2.0
3  * Ring-buffer memory mapping tests
36 	return ret == -1 ? -errno : 0;  in __tracefs_write()
45 		return -1;  in __tracefs_write_int()
63 		return -1;  in tracefs_reset()
65 		return -1;  in tracefs_reset()
67 		return -1;  in tracefs_reset()
69 		return -1;  in tracefs_reset()
79 int tracefs_cpu_map(struct tracefs_cpu_map_desc *desc, int cpu)  in tracefs_cpu_map()  argument
83 	void *map;  in tracefs_cpu_map()  local
86 		     TRACEFS_ROOT"/per_cpu/cpu%d/trace_pipe_raw",  in tracefs_cpu_map()
87 		     cpu) < 0)  in tracefs_cpu_map()
88 		return -ENOMEM;  in tracefs_cpu_map()
90 	desc->cpu_fd = open(cpu_path, O_RDONLY | O_NONBLOCK);  in tracefs_cpu_map()
92 	if (desc->cpu_fd < 0)  in tracefs_cpu_map()
93 		return -ENODEV;  in tracefs_cpu_map()
96 	map = mmap(NULL, page_size, PROT_READ, MAP_SHARED, desc->cpu_fd, 0);  in tracefs_cpu_map()
97 	if (map == MAP_FAILED)  in tracefs_cpu_map()
98 		return -errno;  in tracefs_cpu_map()
100 	desc->meta = (struct trace_buffer_meta *)map;  in tracefs_cpu_map()
102 	/* the meta-page is bigger than the original mapping */  in tracefs_cpu_map()
103 	if (page_size < desc->meta->meta_struct_len) {  in tracefs_cpu_map()
104 		int meta_page_size = desc->meta->meta_page_size;  in tracefs_cpu_map()
106 		munmap(desc->meta, page_size);  in tracefs_cpu_map()
116 	munmap(desc->meta, desc->meta->meta_page_size);  in tracefs_cpu_unmap()
117 	close(desc->cpu_fd);  in tracefs_cpu_unmap()
120 FIXTURE(map) {  in FIXTURE()  argument
125 FIXTURE_VARIANT(map) {  in FIXTURE_VARIANT()  argument
129 FIXTURE_VARIANT_ADD(map, subbuf_size_4k) {  in FIXTURE_VARIANT_ADD()  argument
133 FIXTURE_VARIANT_ADD(map, subbuf_size_8k) {  in FIXTURE_VARIANT_ADD()  argument
137 FIXTURE_SETUP(map)  in FIXTURE_SETUP()  argument
139 	int cpu = sched_getcpu();  in FIXTURE_SETUP()  local
155 	self->umount = umount;  in FIXTURE_SETUP()
157 	ASSERT_GE(cpu, 0);  in FIXTURE_SETUP()
161 	tracefs_write_int(TRACEFS_ROOT"/buffer_subbuf_size_kb", variant->subbuf_size);  in FIXTURE_SETUP()
163 	ASSERT_EQ(tracefs_cpu_map(&self->map_desc, cpu), 0);  in FIXTURE_SETUP()
166 	 * Ensure generated events will be found on this very same ring-buffer.  in FIXTURE_SETUP()
169 	CPU_SET(cpu, &cpu_mask);  in FIXTURE_SETUP()
173 FIXTURE_TEARDOWN(map)  in FIXTURE_TEARDOWN()  argument
177 	if (self->umount)  in FIXTURE_TEARDOWN()
180 	tracefs_cpu_unmap(&self->map_desc);  in FIXTURE_TEARDOWN()
183 TEST_F(map, meta_page_check)  in TEST_F()  argument
185 	struct tracefs_cpu_map_desc *desc = &self->map_desc;  in TEST_F()
188 	ASSERT_EQ(desc->meta->entries, 0);  in TEST_F()
189 	ASSERT_EQ(desc->meta->overrun, 0);  in TEST_F()
190 	ASSERT_EQ(desc->meta->read, 0);  in TEST_F()
192 	ASSERT_EQ(desc->meta->reader.id, 0);  in TEST_F()
193 	ASSERT_EQ(desc->meta->reader.read, 0);  in TEST_F()
195 	ASSERT_EQ(ioctl(desc->cpu_fd, TRACE_MMAP_IOCTL_GET_READER), 0);  in TEST_F()
196 	ASSERT_EQ(desc->meta->reader.id, 0);  in TEST_F()
202 	ASSERT_EQ(ioctl(desc->cpu_fd, TRACE_MMAP_IOCTL_GET_READER), 0);  in TEST_F()
204 	ASSERT_EQ(desc->meta->entries, 16);  in TEST_F()
205 	ASSERT_EQ(desc->meta->overrun, 0);  in TEST_F()
206 	ASSERT_EQ(desc->meta->read, 16);  in TEST_F()
208 	ASSERT_EQ(desc->meta->reader.id, 1);  in TEST_F()
214 TEST_F(map, data_mmap)  in TEST_F()  argument
216 	struct tracefs_cpu_map_desc *desc = &self->map_desc;  in TEST_F()
220 	meta_len = desc->meta->meta_page_size;  in TEST_F()
221 	data_len = desc->meta->subbuf_size * desc->meta->nr_subbufs;  in TEST_F()
223 	/* Map all the available subbufs */  in TEST_F()
225 		    desc->cpu_fd, meta_len);  in TEST_F()
229 	/* Map all the available subbufs - 1 */  in TEST_F()
230 	data_len -= desc->meta->subbuf_size;  in TEST_F()
232 		    desc->cpu_fd, meta_len);  in TEST_F()
236 	/* Offset within ring-buffer bounds, mapping size overflow */  in TEST_F()
237 	meta_len += desc->meta->subbuf_size * 2;  in TEST_F()
239 		    desc->cpu_fd, meta_len);  in TEST_F()
242 	/* Offset outside ring-buffer bounds */  in TEST_F()
243 	data_len = desc->meta->subbuf_size * desc->meta->nr_subbufs;  in TEST_F()
245 		    desc->cpu_fd, data_len + (desc->meta->subbuf_size * 2));  in TEST_F()
248 	/* Verify meta-page padding */  in TEST_F()
249 	if (desc->meta->meta_page_size > getpagesize()) {  in TEST_F()
250 		data_len = desc->meta->meta_page_size;  in TEST_F()
252 			    PROT_READ, MAP_SHARED, desc->cpu_fd, 0);  in TEST_F()
255 		for (int i = desc->meta->meta_struct_len;  in TEST_F()
256 		     i < desc->meta->meta_page_size; i += sizeof(int))  in TEST_F()
287 	self->umount = umount;  in FIXTURE_SETUP()
296 	if (self->umount)  in FIXTURE_TEARDOWN()
303 	int cpu = sched_getcpu();  in TEST_F()  local
305 	ASSERT_GE(cpu, 0);  in TEST_F()
308 	ASSERT_EQ(tracefs_cpu_map(&map_desc, cpu), -EBUSY);  in TEST_F()
314 	int cpu = sched_getcpu();  in TEST_F()  local
316 	ASSERT_EQ(tracefs_cpu_map(&map_desc, cpu), 0);  in TEST_F()
319 				  "snapshot"), -EBUSY);  in TEST_F()
321 				  "1"), -EBUSY);  in TEST_F()