On 22/11/2017 19:00, Chris Wilson wrote:
The kernel doesn't like it when you set max_freq < min_freq and
complains bitterly. So before setting max_freq = min_freq, first set
min_freq to min_freq!
Signed-off-by: Chris Wilson <[email protected]>
Cc: Tvrtko Ursulin <[email protected]>
---
tests/perf_pmu.c | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/tests/perf_pmu.c b/tests/perf_pmu.c
index bcb90c84..b8422211 100644
--- a/tests/perf_pmu.c
+++ b/tests/perf_pmu.c
@@ -946,6 +946,8 @@ test_frequency(int gem_fd)
min_freq = igt_sysfs_get_u32(sysfs, "gt_RPn_freq_mhz");
max_freq = igt_sysfs_get_u32(sysfs, "gt_RP0_freq_mhz");
boost_freq = igt_sysfs_get_u32(sysfs, "gt_boost_freq_mhz");
+ igt_info("Frequency: min=%u, max=%u, boost=%u MHz\n",
+ min_freq, max_freq, boost_freq);
igt_require(min_freq > 0 && max_freq > 0 && boost_freq > 0);
igt_require(max_freq > min_freq);
igt_require(boost_freq > min_freq);
@@ -956,6 +958,8 @@ test_frequency(int gem_fd)
/*
* Set GPU to min frequency and read PMU counters.
*/
+ igt_require(igt_sysfs_set_u32(sysfs, "gt_min_freq_mhz", min_freq));
+ igt_require(igt_sysfs_get_u32(sysfs, "gt_min_freq_mhz") == min_freq);
igt_require(igt_sysfs_set_u32(sysfs, "gt_max_freq_mhz", min_freq));
igt_require(igt_sysfs_get_u32(sysfs, "gt_max_freq_mhz") == min_freq);
igt_require(igt_sysfs_set_u32(sysfs, "gt_boost_freq_mhz", min_freq));
I don't see any harm, but also don't see how min freq is not min freq at
this point. Dealing with random state on the system or some lack of
cleanup from the test itself?
Anyway,
Reviewed-by: Tvrtko Ursulin <[email protected]>
Regards,
Tvrtko
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