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lib: Add igt_drop_caches_set()

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This is basically a "drop cache" interface to the igt_debugfs
facilities. Also, update existing users.

Signed-off-by: Oscar Mateo <oscar.mateo@intel.com>
Cc: Damien Lespiau <damien.lespiau@intel.com>
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Oscar Mateo 2013-11-04 16:30:47 +00:00 committed by Daniel Vetter
parent a97402e89a
commit 5f0ab94c3f
4 changed files with 51 additions and 22 deletions
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28
lib/igt_debugfs.c
View File

@ -316,3 +316,31 @@ igt_pipe_crc_get_crcs(igt_pipe_crc_t *pipe_crc, int n_crcs,
*out_crcs = crcs;
}
/*
* Drop caches
*/
int igt_drop_caches_set(uint64_t val)
{
igt_debugfs_t debugfs;
int fd;
char data[19];
size_t nbytes;
int ret = -1;
sprintf(data, "0x%" PRIx64, val);
igt_debugfs_init(&debugfs);
fd = igt_debugfs_open(&debugfs, "i915_gem_drop_caches", O_WRONLY);
if (fd >= 0)
{
nbytes = write(fd, data, strlen(data) + 1);
if (nbytes == strlen(data) + 1)
ret = 0;
close(fd);
}
return ret;
}

15
lib/igt_debugfs.h
View File

@ -79,4 +79,19 @@ void igt_pipe_crc_stop(igt_pipe_crc_t *pipe_crc);
void igt_pipe_crc_get_crcs(igt_pipe_crc_t *pipe_crc, int n_crcs,
igt_crc_t **out_crcs);
/*
* Drop caches
*/
#define DROP_UNBOUND 0x1
#define DROP_BOUND 0x2
#define DROP_RETIRE 0x4
#define DROP_ACTIVE 0x8
#define DROP_ALL (DROP_UNBOUND | \
DROP_BOUND | \
DROP_RETIRE | \
DROP_ACTIVE)
int igt_drop_caches_set(uint64_t val);
#endif /* __IGT_DEBUGFS_H__ */

15
tests/gem_persistent_relocs.c
View File

@ -42,6 +42,7 @@
#include "intel_bufmgr.h"
#include "intel_batchbuffer.h"
#include "intel_gpu_tools.h"
#include "igt_debugfs.h"
/*
* Testcase: Persistent relocations as used by uxa/libva
@ -287,21 +288,13 @@ static void do_forked_test(int fd, unsigned flags)
struct igt_helper_process thrasher = {};
if (flags & (THRASH | THRASH_INACTIVE)) {
char fname[FILENAME_MAX];
int drop_caches_fd;
const char *data = (flags & THRASH_INACTIVE) ? "0x7" : "0xf";
snprintf(fname, FILENAME_MAX, "%s/%i/%s",
"/sys/kernel/debug/dri", drm_get_card(),
"i915_gem_drop_caches");
drop_caches_fd = open(fname, O_WRONLY);
igt_require(drop_caches_fd >= 0);
uint64_t val = (flags & THRASH_INACTIVE) ?
(DROP_RETIRE | DROP_BOUND | DROP_UNBOUND) : DROP_ALL;
igt_fork_helper(&thrasher) {
while (1) {
usleep(1000);
igt_assert(write(drop_caches_fd, data, strlen(data) + 1) == strlen(data) + 1);
do_or_die(igt_drop_caches_set(val));
}
}
}

15
tests/gem_reloc_vs_gpu.c
View File

@ -42,6 +42,7 @@
#include "intel_bufmgr.h"
#include "intel_batchbuffer.h"
#include "intel_gpu_tools.h"
#include "igt_debugfs.h"
/*
* Testcase: Kernel relocations vs. gpu races
@ -282,21 +283,13 @@ static void do_forked_test(int fd, unsigned flags)
struct igt_helper_process thrasher = {};
if (flags & (THRASH | THRASH_INACTIVE)) {
char fname[FILENAME_MAX];
int drop_caches_fd;
const char *data = (flags & THRASH_INACTIVE) ? "0x7" : "0xf";
snprintf(fname, FILENAME_MAX, "%s/%i/%s",
"/sys/kernel/debug/dri", drm_get_card(),
"i915_gem_drop_caches");
drop_caches_fd = open(fname, O_WRONLY);
igt_require(drop_caches_fd >= 0);
uint64_t val = (flags & THRASH_INACTIVE) ?
(DROP_RETIRE | DROP_BOUND | DROP_UNBOUND) : DROP_ALL;
igt_fork_helper(&thrasher) {
while (1) {
usleep(1000);
igt_assert(write(drop_caches_fd, data, strlen(data) + 1) == strlen(data) + 1);
do_or_die(igt_drop_caches_set(val));
}
}
}