From: Ben Goz <ben.goz@xxxxxxx>
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@xxxxxxx>
Signed-off-by: Oded Gabbay <oded.gabbay@xxxxxxx>
---
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
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