6.18-stable review patch. If anyone has any objections, please let me know.
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From: Matthew Brost matthew.brost@intel.com
commit 6f0f404bd289d79a260b634c5b3f4d330b13472c upstream.
A 10ms timeslice for long-running workloads is far too long and causes significant jitter in benchmarks when the system is shared. Adjust the value to 5ms for preempt-fencing VMs, as the resume step there is quite costly as memory is moved around, and set it to zero for pagefault VMs, since switching back to pagefault mode after dma-fence mode is relatively fast.
Also change min_run_period_ms to 'unsiged int' type rather than 's64' as only positive values make sense.
Fixes: dd08ebf6c352 ("drm/xe: Introduce a new DRM driver for Intel GPUs") Cc: stable@vger.kernel.org Signed-off-by: Matthew Brost matthew.brost@intel.com Reviewed-by: Thomas Hellström thomas.hellstrom@linux.intel.com Link: https://patch.msgid.link/20251212182847.1683222-2-matthew.brost@intel.com (cherry picked from commit 33a5abd9a68394aa67f9618b20eee65ee8702ff4) Signed-off-by: Thomas Hellström thomas.hellstrom@linux.intel.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/xe/xe_vm.c | 5 ++++- drivers/gpu/drm/xe/xe_vm_types.h | 2 +- 2 files changed, 5 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/xe/xe_vm.c +++ b/drivers/gpu/drm/xe/xe_vm.c @@ -1481,7 +1481,10 @@ struct xe_vm *xe_vm_create(struct xe_dev INIT_WORK(&vm->destroy_work, vm_destroy_work_func);
INIT_LIST_HEAD(&vm->preempt.exec_queues); - vm->preempt.min_run_period_ms = 10; /* FIXME: Wire up to uAPI */ + if (flags & XE_VM_FLAG_FAULT_MODE) + vm->preempt.min_run_period_ms = 0; + else + vm->preempt.min_run_period_ms = 5;
for_each_tile(tile, xe, id) xe_range_fence_tree_init(&vm->rftree[id]); --- a/drivers/gpu/drm/xe/xe_vm_types.h +++ b/drivers/gpu/drm/xe/xe_vm_types.h @@ -268,7 +268,7 @@ struct xe_vm { * @min_run_period_ms: The minimum run period before preempting * an engine again */ - s64 min_run_period_ms; + unsigned int min_run_period_ms; /** @exec_queues: list of exec queues attached to this VM */ struct list_head exec_queues; /** @num_exec_queues: number exec queues attached to this VM */