drm/xe: Add min/max cap for engine scheduler properties

Add sysfs entries for the min, max, and defaults for each of
engine scheduler controls for every hardware engine class.

Non-elevated user IOCTLs to set these controls must be within
the min-max ranges of the sysfs entries, elevated user can set
these controls to any value. However, introduced compile time
CONFIG min-max values which restricts elevated user to be in
compile time min-max range if at all sysfs min/max are violated.

Sysfs entries examples are,
DUT# cat /sys/class/drm/cardX/device/tileN/gtN/engines/ccs/.defaults/
job_timeout_max         job_timeout_ms          preempt_timeout_min     timeslice_duration_max  timeslice_duration_us
job_timeout_min         preempt_timeout_max     preempt_timeout_us      timeslice_duration_min

DUT# cat /sys/class/drm/card1/device/tileN/gtN/engines/ccs/
.defaults/              job_timeout_min         preempt_timeout_max     preempt_timeout_us      timeslice_duration_min
job_timeout_max         job_timeout_ms          preempt_timeout_min     timeslice_duration_max  timeslice_duration_us

V12:
   - Rebase
V11:
   - Make engine_get_prop_minmax and enforce_sched_limit static - Matt
   - use enum in place of string in engine_get_prop_minmax - Matt
   - no need to use enforce_sched_limit or no need to filter min/max
     per user type in sysfs - Matt
V10:
   - Add kernel doc for non-static func
   - Make helper to get min/max for range validation - Matt
   - Filter min/max per user type
V9 :
   - Rebase to use s/xe_engine/xe_hw_engine/ - Matt
V8 :
   - fix enforce_sched_limit and avoid code duplication - Niranjana
   - Make sure min < max - Niranjana
V7 :
   - Rebase to replace hw engine with eclass interface
   - return EINVAL in place of EPERM
   - Use some APIs to avoid code duplication
V6 :
   - Rebase changes to reflect per engine class props interface - MattB
   - Use #if ENABLED - MattB
   - Remove MAX_SCHED_TIMEOUT check as range validation is enough
V5 :
   - Rebase to resolve conflicts - CI
V4 :
   - Rebase
   - Update commit to reflect tile addition
   - Use XE_HW macro directly as they are already filtered
     for CONFIG checks - Niranjana
   - Add CONFIG for enable/disable min/max limitation
     on elevated user. Default is enable - Matt/Joonas
V3 :
   - Resolve CI hooks warning for kernel-doc
V2 :
   - Restric min/max setting to #define default min/max for
     elevated user - Himal
   - Remove unrelated changes from patch - Niranjana

Reviewed-by: Niranjana Vishwanathapura <niranjana.vishwanathapura@intel.com>
Reviewed-by: Matthew Brost <matthew.brost@intel.com>
Signed-off-by: Tejas Upadhyay <tejas.upadhyay@intel.com>
Signed-off-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/drivers/gpu/drm/xe/xe_hw_engine.c b/drivers/gpu/drm/xe/xe_hw_engine.c
index b7be7b0acb35..b8fcc6e985cf 100644
--- a/drivers/gpu/drm/xe/xe_hw_engine.c
+++ b/drivers/gpu/drm/xe/xe_hw_engine.c
@@ -364,8 +364,16 @@ static void hw_engine_init_early(struct xe_gt *gt, struct xe_hw_engine *hwe,
 
 	if (!gt->eclass[hwe->class].sched_props.job_timeout_ms) {
 		gt->eclass[hwe->class].sched_props.job_timeout_ms = 5 * 1000;
+		gt->eclass[hwe->class].sched_props.job_timeout_min = XE_HW_ENGINE_JOB_TIMEOUT_MIN;
+		gt->eclass[hwe->class].sched_props.job_timeout_max = XE_HW_ENGINE_JOB_TIMEOUT_MAX;
 		gt->eclass[hwe->class].sched_props.timeslice_us = 1 * 1000;
+		gt->eclass[hwe->class].sched_props.timeslice_min = XE_HW_ENGINE_TIMESLICE_MIN;
+		gt->eclass[hwe->class].sched_props.timeslice_max = XE_HW_ENGINE_TIMESLICE_MAX;
 		gt->eclass[hwe->class].sched_props.preempt_timeout_us = 640 * 1000;
+		gt->eclass[hwe->class].sched_props.preempt_timeout_min =
+								XE_HW_ENGINE_PREEMPT_TIMEOUT_MIN;
+		gt->eclass[hwe->class].sched_props.preempt_timeout_max =
+								XE_HW_ENGINE_PREEMPT_TIMEOUT_MAX;
 		/* Record default props */
 		gt->eclass[hwe->class].defaults = gt->eclass[hwe->class].sched_props;
 	}