[PATCH] drm/xe/vm: Keep the device awake for TLB inval

[Nirmoy Das]

GT can suspend while TLB invalidation is happening in the background.
This would cause a TLB timeout when that happens. Keep the device awake
when using fence which doesn't wait for the TLB invalidation to finish.

Cc: Matthew Brost <matthew.brost at intel.com>
Signed-off-by: Nirmoy Das <nirmoy.das at intel.com>
---
Adding strace here for more information:

xe_pm-18095   [001] .....  3493.481048: xe_vma_unbind: dev=0000:00:02.0, vma=ffff8881c3062b00, asid=0x0000f, start=0x0000001a0000, end=0x0000001a1fff, userptr=0x000000000000,
xe_pm-18095   [001] .....  3493.481063: xe_vm_cpu_bind: dev=0000:00:02.0, vm=ffff88812a00d000, asid=0x0000f
xe_pm-18095   [001] .....  3493.481093: xe_gt_tlb_invalidation_fence_create: dev=0000:00:02.0, fence=ffff88811bf3d000, seqno=0
xe_pm-18095   [001] .....  3493.481095: xe_gt_tlb_invalidation_fence_work_func: dev=0000:00:02.0, fence=ffff88811bf3d000, seqno=0
xe_pm-18095   [001] .....  3493.481097: xe_gt_tlb_TL_fence_send: dev=0000:00:02.0, fence=ffff88811bf3d000, seqno=93
xe_pm-18095   [001] d..1.  3493.481097: xe_guc_ctb_h2g: H2G CTB: dev=0000:00:02.0, gt0: action=0x7000, len=8, tail=44, head=36
kworker/1:2-17900   [001] .....  3493.481302: xe_exec_queue_stop: dev=0000:00:02.0, 3:0x2, gt=0, width=1, guc_id=0, guc_state=0x0, flags=0x13
kworker/1:2-17900   [001] .....  3493.481303: xe_exec_queue_stop: dev=0000:00:02.0, 3:0x1, gt=0, width=1, guc_id=1, guc_state=0x0, flags=0x4
kworker/1:2-17900   [001] .....  3493.481305: xe_exec_queue_stop: dev=0000:00:02.0, 0:0x1, gt=0, width=1, guc_id=2, guc_state=0x0, flags=0x0
xe_pm-18095   [001] .....  3493.756294: xe_guc_ctb_h2g: H2G CTB: dev=0000:00:02.0, gt0: action=0x3003, len=5, tail=5, head=0
xe_pm-18095   [001] d..1.  3493.756470: xe_guc_ctb_h2g: H2G CTB: dev=0000:00:02.0, gt0: action=0x3003, len=5, tail=10, head=5
kworker/u32:1-17912   [006] d..1.  3493.756535: xe_guc_ctb_g2h: G2H CTB: dev=0000:00:02.0, gt0: action=0x0, len=2, tail=2, head=2
xe_pm-18095   [001] .....  3493.756557: xe_guc_ctb_h2g: H2G CTB: dev=0000:00:02.0, gt0: action=0x3003, len=5, tail=15, head=10
xe_pm-18095   [001] .....  3493.756559: xe_guc_ctb_h2g: H2G CTB: dev=0000:00:02.0, gt0: action=0x3004, len=3, tail=18, head=10
kworker/1:2-17900   [001] d..1.  3497.951783: xe_gt_tlb_invalidation_fence_timeout: dev=0000:00:02.0, fence=ffff88811bf3d000, seqno=93

 drivers/gpu/drm/xe/xe_vm.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/xe/xe_vm.c b/drivers/gpu/drm/xe/xe_vm.c
index b6932cc98ff9..241b7ea00d5f 100644
--- a/drivers/gpu/drm/xe/xe_vm.c
+++ b/drivers/gpu/drm/xe/xe_vm.c
@@ -2700,6 +2700,7 @@ static int vm_bind_ioctl_ops_execute(struct xe_vm *vm,
 	struct dma_fence *fence;
 	int err;
 
+	xe_pm_runtime_get(vm->xe);
 	lockdep_assert_held_write(&vm->lock);
 
 	drm_exec_init(&exec, DRM_EXEC_INTERRUPTIBLE_WAIT |
@@ -2721,6 +2722,7 @@ static int vm_bind_ioctl_ops_execute(struct xe_vm *vm,
 
 unlock:
 	drm_exec_fini(&exec);
+	xe_pm_runtime_put(vm->xe);
 	return err;
 }
 
-- 
2.42.0