drm/radeon: fix PFP sync in vm_flush

Otherwise the next IB might start reading commands
with the page table still invalid.

Signed-off-by: Christian König <deathsimple@vodafone.de>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/gpu/drm/radeon/si.c b/drivers/gpu/drm/radeon/si.c
index df8dd770164..da184de021b 100644
--- a/drivers/gpu/drm/radeon/si.c
+++ b/drivers/gpu/drm/radeon/si.c
@@ -2868,6 +2868,10 @@ void si_vm_flush(struct radeon_device *rdev, int ridx, struct radeon_vm *vm)
         radeon_ring_write(ring, VM_INVALIDATE_REQUEST >> 2);
         radeon_ring_write(ring, 0);
         radeon_ring_write(ring, 1 << vm->id);
+
+        /* sync PFP to ME, otherwise we might get invalid PFP reads */
+        radeon_ring_write(ring, PACKET3(PACKET3_PFP_SYNC_ME, 0));
+        radeon_ring_write(ring, 0x0);
 }
 
 /*