[PATCH 2/2] drm/amdkfd: unmap VMID<-->PASID when relesing VMID (non-HWS)

[Oded Gabbay]

From: Ben Goz <ben....@amd.com>

This patch fixes a bug where deallocate_vmid() didn't actually unmap the
VMID<-->PASID mapping (in the registers).
That can cause undefined behavior.

This bug only occurs in non-HWS mode.

Signed-off-by: Ben Goz <ben.goz at amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay at amd.com>
---
 drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c 
b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
index 3b08ed6..9c8961d 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
@@ -161,6 +161,9 @@ static void deallocate_vmid(struct device_queue_manager 
*dqm,
 {
        int bit = qpd->vmid - KFD_VMID_START_OFFSET;

+       /* Release the vmid mapping */
+       set_pasid_vmid_mapping(dqm, 0, qpd->vmid);
+
        set_bit(bit, (unsigned long *)&dqm->vmid_bitmap);
        qpd->vmid = 0;
        q->properties.vmid = 0;
-- 
1.9.1