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gem_ppgtt: Test VMA leak on context destruction

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Test that VMAs associated with a context are cleaned up when
contexts are destroyed.

In practice this emulates the leak seen between fbcon and X server.
Every time the X server exits we gain one VMA on the fbcon frame
buffer object as externally visible via for example
/sys/kernel/debug/dri/0/i915_gem_gtt.

v2: Use igt_debugfs_open, getline and strstr instead of home-brewed
string matching. (Thomas Wood)

v3: Rebase for drm_open_driver.

Signed-off-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Thomas Wood <thomas.wood@intel.com>
Signed-off-by: Thomas Wood <thomas.wood@intel.com>
This commit is contained in:
Tvrtko Ursulin 2015-09-24 12:05:07 +01:00 committed by Thomas Wood
parent 2442f595d2
commit 1ea96af776
1 changed files with 86 additions and 0 deletions
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86
tests/gem_ppgtt.c
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@ -37,6 +37,7 @@
#include <drm.h>
#include "intel_bufmgr.h"
#include "igt_debugfs.h"
#define WIDTH 512
#define STRIDE (WIDTH*4)
@ -265,6 +266,88 @@ static void flink_and_close(void)
close(fd2);
}
static bool grep_name(const char *fname, const char *match)
{
int fd;
FILE *fh;
size_t n = 0;
char *line = NULL;
char *matched = NULL;
fd = igt_debugfs_open(fname, O_RDONLY);
igt_assert(fd >= 0);
fh = fdopen(fd, "r");
igt_assert(fh);
while (getline(&line, &n, fh) >= 0) {
matched = strstr(line, match);
if (line) {
free(line);
line = NULL;
}
if (matched)
break;
}
if (line)
free(line);
fclose(fh);
return matched != NULL;
}
static void flink_and_exit(void)
{
uint32_t fd, fd2;
uint32_t bo, flinked_bo, name;
char match[100];
int to_match;
bool matched;
int retry = 0;
const int retries = 50;
fd = drm_open_driver(DRIVER_INTEL);
igt_require(uses_full_ppgtt(fd));
bo = gem_create(fd, 4096);
name = gem_flink(fd, bo);
to_match = snprintf(match, sizeof(match), "(name: %u)", name);
igt_assert(to_match < sizeof(match));
fd2 = drm_open_driver(DRIVER_INTEL);
flinked_bo = gem_open(fd2, name);
exec_and_get_offset(fd2, flinked_bo);
gem_sync(fd2, flinked_bo);
/* Verify looking for string works OK. */
matched = grep_name("i915_gem_gtt", match);
igt_assert_eq(matched, true);
gem_close(fd2, flinked_bo);
/* Close the context. */
close(fd2);
retry:
/* Give cleanup some time to run. */
usleep(100000);
/* The flinked bo VMA should have been cleared now, so list of VMAs
* in debugfs should not contain the one for the imported object.
*/
matched = grep_name("i915_gem_gtt", match);
if (matched && retry++ < retries)
goto retry;
igt_assert_eq(matched, false);
gem_close(fd, bo);
close(fd);
}
#define N_CHILD 8
int main(int argc, char **argv)
{
@ -297,5 +380,8 @@ int main(int argc, char **argv)
igt_subtest("flink-and-close-vma-leak")
flink_and_close();
igt_subtest("flink-and-exit-vma-leak")
flink_and_exit();
igt_exit();
}