diff options
| -rw-r--r-- | drivers/gpu/drm/xe/xe_gt_throttle.c | 58 |
1 files changed, 56 insertions, 2 deletions
diff --git a/drivers/gpu/drm/xe/xe_gt_throttle.c b/drivers/gpu/drm/xe/xe_gt_throttle.c index fa7068aac334..82c5fbcdfbe3 100644 --- a/drivers/gpu/drm/xe/xe_gt_throttle.c +++ b/drivers/gpu/drm/xe/xe_gt_throttle.c @@ -22,9 +22,15 @@ * Their availability depend on the platform and some may not be visible if that * reason is not available. * + * The ``reasons`` attribute can be used by sysadmin to monitor all possible + * reasons for throttling and report them. It's preferred over monitoring + * ``status`` and then reading the reason from individual attributes since that + * is racy. If there's no throttling happening, "none" is returned. + * * The following attributes are available on Crescent Island platform: * - * - ``status``: Overall throttle status + * - ``status``: Overall throttle status (0: no throttling, 1: throttling) + * - ``reasons``: Array of reasons causing throttling separated by space * - ``reason_pl1``: package PL1 * - ``reason_pl2``: package PL2 * - ``reason_pl4``: package PL4 @@ -43,7 +49,8 @@ * * Other platforms support the following reasons: * - * - ``status``: Overall status + * - ``status``: Overall throttle status (0: no throttling, 1: throttling) + * - ``reasons``: Array of reasons causing throttling separated by space * - ``reason_pl1``: package PL1 * - ``reason_pl2``: package PL2 * - ``reason_pl4``: package PL4, Iccmax etc. @@ -111,12 +118,57 @@ static ssize_t reason_show(struct kobject *kobj, return sysfs_emit(buff, "%u\n", is_throttled_by(gt, ta->mask)); } +static const struct attribute_group *get_platform_throttle_group(struct xe_device *xe); + +static ssize_t reasons_show(struct kobject *kobj, + struct kobj_attribute *attr, char *buff) +{ + struct xe_gt *gt = throttle_to_gt(kobj); + struct xe_device *xe = gt_to_xe(gt); + const struct attribute_group *group; + struct attribute **pother; + ssize_t ret = 0; + u32 reasons; + + reasons = xe_gt_throttle_get_limit_reasons(gt); + if (!reasons) + goto ret_none; + + group = get_platform_throttle_group(xe); + for (pother = group->attrs; *pother; pother++) { + struct kobj_attribute *kattr = container_of(*pother, struct kobj_attribute, attr); + struct throttle_attribute *other_ta = kobj_attribute_to_throttle(kattr); + + if (other_ta->mask != U32_MAX && reasons & other_ta->mask) + ret += sysfs_emit_at(buff, ret, "%s ", (*pother)->name); + } + + if (drm_WARN_ONCE(&xe->drm, !ret, "Unknown reason: %#x\n", reasons)) + goto ret_none; + + /* Drop extra space from last iteration above */ + ret--; + ret += sysfs_emit_at(buff, ret, "\n"); + + return ret; + +ret_none: + return sysfs_emit(buff, "none\n"); +} + #define THROTTLE_ATTR_RO(name, _mask) \ struct throttle_attribute attr_##name = { \ .attr = __ATTR(name, 0444, reason_show, NULL), \ .mask = _mask, \ } +#define THROTTLE_ATTR_RO_FUNC(name, _mask, _show) \ + struct throttle_attribute attr_##name = { \ + .attr = __ATTR(name, 0444, _show, NULL), \ + .mask = _mask, \ + } + +static THROTTLE_ATTR_RO_FUNC(reasons, 0, reasons_show); static THROTTLE_ATTR_RO(status, U32_MAX); static THROTTLE_ATTR_RO(reason_pl1, POWER_LIMIT_1_MASK); static THROTTLE_ATTR_RO(reason_pl2, POWER_LIMIT_2_MASK); @@ -128,6 +180,7 @@ static THROTTLE_ATTR_RO(reason_vr_thermalert, VR_THERMALERT_MASK); static THROTTLE_ATTR_RO(reason_vr_tdc, VR_TDC_MASK); static struct attribute *throttle_attrs[] = { + &attr_reasons.attr.attr, &attr_status.attr.attr, &attr_reason_pl1.attr.attr, &attr_reason_pl2.attr.attr, @@ -153,6 +206,7 @@ static THROTTLE_ATTR_RO(reason_psys_crit, PSYS_CRIT_MASK); static struct attribute *cri_throttle_attrs[] = { /* Common */ + &attr_reasons.attr.attr, &attr_status.attr.attr, &attr_reason_pl1.attr.attr, &attr_reason_pl2.attr.attr, |