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[module] test mmaping with offsets in test program

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This commit makes the test program try the following cases:
* mmaping 0-offset dmabuf with 0 offset
* mmaping 0-offset dmabuf with 1 page offset
* mmaping page-offset dmabuf with 0 offset
* mmaping page-offset dmabuf with 1 page offset
* mmaping device with 0 offset
* mmaping device with 1 page offset
This commit is contained in:
Quantum 2021-02-05 23:25:09 -05:00 committed by Geoffrey McRae
parent 5774e21965
commit 328f9078ee
2 changed files with 79 additions and 4 deletions
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76
module/test.c
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@ -1,5 +1,6 @@
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <inttypes.h>
#include <unistd.h> #include <unistd.h>
#include <string.h> #include <string.h>
#include <fcntl.h> #include <fcntl.h>
@ -13,6 +14,8 @@
int main(void) int main(void)
{ {
int page_size = getpagesize();
int fd = open("/dev/kvmfr0", O_RDWR); int fd = open("/dev/kvmfr0", O_RDWR);
if (fd < 0) if (fd < 0)
{ {
@ -23,6 +26,7 @@ int main(void)
unsigned long size = ioctl(fd, KVMFR_DMABUF_GETSIZE , 0); unsigned long size = ioctl(fd, KVMFR_DMABUF_GETSIZE , 0);
printf("Size: %lu MiB\n", size / 1024 / 1024); printf("Size: %lu MiB\n", size / 1024 / 1024);
// mmaping 0-offset dmabuf with 0 offset
struct kvmfr_dmabuf_create create = struct kvmfr_dmabuf_create create =
{ {
.flags = KVMFR_DMABUF_FLAG_CLOEXEC, .flags = KVMFR_DMABUF_FLAG_CLOEXEC,
@ -37,14 +41,78 @@ int main(void)
} }
void * mem = mmap(NULL, create.size, PROT_READ | PROT_WRITE, MAP_SHARED, dmaFd, 0); void * mem = mmap(NULL, create.size, PROT_READ | PROT_WRITE, MAP_SHARED, dmaFd, 0);
if (!mem) if (mem == MAP_FAILED)
{ {
perror("mmap"); perror("mmap on dmabuf with no offset");
return -1; return -1;
} }
memset(mem, 0xAA, create.size); memset(mem, 0xAA, create.size);
strcpy(mem + page_size, "Hello, world!");
munmap(mem, create.size); munmap(mem, create.size);
// mmaping 0-offset dmabuf with 1 page offset
mem = mmap(NULL, page_size, PROT_READ | PROT_WRITE, MAP_SHARED, dmaFd, page_size);
if (mem == MAP_FAILED)
{
perror("mmap on dmabuf with offset");
return -1;
}
printf("Read string: %s\n", (char *) mem);
munmap(mem, page_size);
close(dmaFd);
// mmaping page-offset dmabuf with 0 offset
create.offset = page_size;
create.size = 2 * page_size;
dmaFd = ioctl(fd, KVMFR_DMABUF_CREATE, &create);
mem = mmap(NULL, create.size, PROT_READ | PROT_WRITE, MAP_SHARED, dmaFd, 0);
if (mem == MAP_FAILED)
{
perror("mmap on offset dmabuf with no offset");
return -1;
}
printf("Read string: %s\n", (char *) mem);
munmap(mem, create.size);
// mmaping page-offset dmabuf with 1 page offset
char *bytes = mmap(NULL, page_size, PROT_READ | PROT_WRITE, MAP_SHARED, dmaFd, page_size);
if (bytes == MAP_FAILED)
{
perror("mmap on offset dmabuf with offset");
return -1;
}
for (int i = 0; i < page_size; i++)
if (bytes[i] != (char) 0xAA)
printf("Index: %d: 0x%02x\n", i, (unsigned) bytes[i]);
munmap(mem, page_size);
close(dmaFd);
// mmaping device with 0 offset
mem = mmap(NULL, page_size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, page_size);
if (mem == MAP_FAILED)
{
perror("mmap on file with offset");
return -1;
}
printf("Read string: %s\n", (char *) mem);
munmap(mem, page_size);
// mmaping device with 0 offset
uint32_t *data = mmap(NULL, create.size, PROT_READ | PROT_WRITE, MAP_SHARED, fd, 0);
if (data == MAP_FAILED)
{
perror("mmap on file with no offset");
return -1;
}
for (size_t i = 0; i < create.size / sizeof(uint32_t); i++)
{
if (data[i] != 0xAAAAAAAA)
printf("Index %lu: 0x%08" PRIx32 "\n", i, data[i]);
}
munmap(data, create.size);
close(fd); close(fd);
return 0; return 0;
} }

7
module/test.expected Normal file
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@ -0,0 +1,7 @@
Read string: Hello, world!
Read string: Hello, world!
Read string: Hello, world!
Index 1024: 0x6c6c6548
Index 1025: 0x77202c6f
Index 1026: 0x646c726f
Index 1027: 0xaaaa0021