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igt/gem_mmap_gtt: Add a test to exercise coherency between GTT/CPU

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This checks whether a write through the GTT is immediately visible to
the CPU.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
This commit is contained in:
Chris Wilson 2016-01-07 10:54:30 +00:00
parent 8528b484e8
commit fca862cdd3
1 changed files with 79 additions and 0 deletions
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79
tests/gem_mmap_gtt.c
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@ -253,6 +253,83 @@ test_write_gtt(int fd)
munmap(src, OBJECT_SIZE);
}
static unsigned int clflush_size;
static int setup_clflush(void)
{
FILE *file;
char *line = NULL;
size_t size = 0;
int first_stanza = 1;
int has_clflush = 0;
file = fopen("/proc/cpuinfo", "r");
if (file == NULL)
return 0;
while (getline(&line, &size, file) != -1) {
if (strncmp(line, "processor", 9) == 0) {
if (!first_stanza)
break;
first_stanza = 0;
}
if (strncmp(line, "flags", 5) == 0) {
if (strstr(line, "clflush"))
has_clflush = 1;
}
if (strncmp(line, "clflush size", 12) == 0) {
char *colon = strchr(line, ':');
if (colon)
clflush_size = atoi(colon + 1);
}
}
free(line);
fclose(file);
return has_clflush && clflush_size;
}
static void clflush(void *addr, int size)
{
char *p, *end;
end = (char *)addr + size;
p = (char *)((uintptr_t)addr & ~((uintptr_t)clflush_size - 1));
asm volatile("mfence" ::: "memory");
for (; p < end; p += clflush_size)
asm volatile("clflush %0" : "+m" (*(volatile char *)p));
asm volatile("mfence" ::: "memory");
}
static void
test_coherency(int fd)
{
uint32_t handle;
uint32_t *gtt, *cpu;
int i;
igt_require(setup_clflush());
handle = gem_create(fd, OBJECT_SIZE);
gtt = gem_mmap__gtt(fd, handle, OBJECT_SIZE, PROT_READ | PROT_WRITE);
cpu = gem_mmap__cpu(fd, handle, 0, OBJECT_SIZE, PROT_READ | PROT_WRITE);
set_domain_gtt(fd, handle);
for (i = 0; i < OBJECT_SIZE / 64; i++) {
int x = 16*i + (i%16);
gtt[x] = i;
clflush(&cpu[x], sizeof(cpu[x]));
igt_assert_eq(cpu[x], i);
}
munmap(cpu, OBJECT_SIZE);
munmap(gtt, OBJECT_SIZE);
gem_close(fd, handle);
}
static void
test_huge_bo(int fd, int huge, int tiling)
{
@ -520,6 +597,8 @@ igt_main
test_write(fd);
igt_subtest("basic-write-gtt")
test_write_gtt(fd);
igt_subtest("coherency")
test_coherency(fd);
igt_subtest("basic-read-write")
test_read_write(fd, READ_BEFORE_WRITE);
igt_subtest("basic-write-read")