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drm/i915/selftest: Update the SLPC selftest

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Use the new efficient frequency toggling interface. Also
create a helper function to restore the frequencies after
the test is done.

v2: Restore max freq first and then min.

Signed-off-by: Vinay Belgaumkar <vinay.belgaumkar@intel.com>
Reviewed-by: Andi Shyti <andi.shyti@linux.intel.com>
Signed-off-by: John Harrison <John.C.Harrison@Intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230426003942.1924347-2-vinay.belgaumkar@intel.com
This commit is contained in:
Vinay Belgaumkar
2023-04-25 17:39:42 -07:00
committed by John Harrison
parent 55f9720dbf
commit c73bd1706c
1 changed files with 37 additions and 5 deletions
Download Patch File Download Diff File Expand all files Collapse all files

42
drivers/gpu/drm/i915/gt/selftest_slpc.c
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@@ -70,6 +70,31 @@ static int slpc_set_freq(struct intel_gt *gt, u32 freq)
return err;
}
static int slpc_restore_freq(struct intel_guc_slpc *slpc, u32 min, u32 max)
{
int err;
err = slpc_set_max_freq(slpc, max);
if (err) {
pr_err("Unable to restore max freq");
return err;
}
err = slpc_set_min_freq(slpc, min);
if (err) {
pr_err("Unable to restore min freq");
return err;
}
err = intel_guc_slpc_set_ignore_eff_freq(slpc, false);
if (err) {
pr_err("Unable to restore efficient freq");
return err;
}
return 0;
}
static u64 measure_power_at_freq(struct intel_gt *gt, int *freq, u64 *power)
{
int err = 0;
@@ -268,8 +293,7 @@ static int run_test(struct intel_gt *gt, int test_type)
/*
* Set min frequency to RPn so that we can test the whole
* range of RPn-RP0. This also turns off efficient freq
* usage and makes results more predictable.
* range of RPn-RP0.
*/
err = slpc_set_min_freq(slpc, slpc->min_freq);
if (err) {
@@ -277,6 +301,15 @@ static int run_test(struct intel_gt *gt, int test_type)
return err;
}
/*
* Turn off efficient frequency so RPn/RP0 ranges are obeyed.
*/
err = intel_guc_slpc_set_ignore_eff_freq(slpc, true);
if (err) {
pr_err("Unable to turn off efficient freq!");
return err;
}
intel_gt_pm_wait_for_idle(gt);
intel_gt_pm_get(gt);
for_each_engine(engine, gt, id) {
@@ -358,9 +391,8 @@ static int run_test(struct intel_gt *gt, int test_type)
break;
}
/* Restore min/max frequencies */
slpc_set_max_freq(slpc, slpc_max_freq);
slpc_set_min_freq(slpc, slpc_min_freq);
/* Restore min/max/efficient frequencies */
err = slpc_restore_freq(slpc, slpc_min_freq, slpc_max_freq);
if (igt_flush_test(gt->i915))
err = -EIO;