Commit 7738be97 authored by Ashutosh Dixit's avatar Ashutosh Dixit Committed by Rodrigo Vivi

drm/i915/gt: Perf_limit_reasons are only available for Gen11+

Register GT0_PERF_LIMIT_REASONS (0x1381a8) is available only for
Gen11+. Therefore ensure perf_limit_reasons sysfs files are created only
for Gen11+. Otherwise on Gen < 5 accessing these files results in the
following oops:

<1> [88.829420] BUG: unable to handle page fault for address: ffffc90000bb81a8
<1> [88.829438] #PF: supervisor read access in kernel mode
<1> [88.829447] #PF: error_code(0x0000) - not-present page

This patch is a backport of the drm-tip commit 0d2d2010
("drm/i915: Perf_limit_reasons are only available for Gen11+") to
drm-intel-fixes. The backport is not identical to the original, it only
includes the sysfs portions of if. The debugfs portion is not available
in drm-intel-fixes so has not been backported.

Bspec: 20008
Bug: https://gitlab.freedesktop.org/drm/intel/-/issues/6863
Fixes: fa68bff7 ("drm/i915/gt: Add sysfs throttle frequency interfaces")
Signed-off-by: default avatarAshutosh Dixit <ashutosh.dixit@intel.com>
Reviewed-by: default avatarRodrigo Vivi <rodrigo.vivi@intel.com>
Signed-off-by: default avatarRodrigo Vivi <rodrigo.vivi@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220919162401.2077713-1-ashutosh.dixit@intel.com
(backported from commit 0d2d2010)
parent 6ef7d362
......@@ -545,8 +545,7 @@ static INTEL_GT_RPS_BOOL_ATTR_RO(throttle_reason_ratl, RATL_MASK);
static INTEL_GT_RPS_BOOL_ATTR_RO(throttle_reason_vr_thermalert, VR_THERMALERT_MASK);
static INTEL_GT_RPS_BOOL_ATTR_RO(throttle_reason_vr_tdc, VR_TDC_MASK);
static const struct attribute *freq_attrs[] = {
&dev_attr_punit_req_freq_mhz.attr,
static const struct attribute *throttle_reason_attrs[] = {
&attr_throttle_reason_status.attr,
&attr_throttle_reason_pl1.attr,
&attr_throttle_reason_pl2.attr,
......@@ -763,12 +762,20 @@ void intel_gt_sysfs_pm_init(struct intel_gt *gt, struct kobject *kobj)
if (!is_object_gt(kobj))
return;
ret = sysfs_create_files(kobj, freq_attrs);
ret = sysfs_create_file(kobj, &dev_attr_punit_req_freq_mhz.attr);
if (ret)
drm_warn(&gt->i915->drm,
"failed to create gt%u throttle sysfs files (%pe)",
"failed to create gt%u punit_req_freq_mhz sysfs (%pe)",
gt->info.id, ERR_PTR(ret));
if (GRAPHICS_VER(gt->i915) >= 11) {
ret = sysfs_create_files(kobj, throttle_reason_attrs);
if (ret)
drm_warn(&gt->i915->drm,
"failed to create gt%u throttle sysfs files (%pe)",
gt->info.id, ERR_PTR(ret));
}
if (HAS_MEDIA_RATIO_MODE(gt->i915) && intel_uc_uses_guc_slpc(&gt->uc)) {
ret = sysfs_create_files(kobj, media_perf_power_attrs);
if (ret)
......
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