drm/amdkfd: Only apply heavy-weight TLB flush on Aldebaran

It is to workaround HW bug on other Asics and based on
reverting two commits back:
  drm/amdkfd: Add heavy-weight TLB flush after unmapping
  drm/amdkfd: Add memory sync before TLB flush on unmap

Signed-off-by: Eric Huang <jinhuieric.huang@amd.com>
Reviewed-by: Felix Kuehling <Felix.Kuehling@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdkfd/kfd_chardev.c

@@ -1570,23 +1570,25 @@ static int kfd_ioctl_unmap_memory_from_gpu(struct file *filep,
 	}
 	mutex_unlock(&p->mutex);
 
-	err = amdgpu_amdkfd_gpuvm_sync_memory(dev->kgd, (struct kgd_mem *) mem, true);
-	if (err) {
-		pr_debug("Sync memory failed, wait interrupted by user signal\n");
-		goto sync_memory_failed;
-	}
+	if (dev->device_info->asic_family == CHIP_ALDEBARAN) {
+		err = amdgpu_amdkfd_gpuvm_sync_memory(dev->kgd,
+				(struct kgd_mem *) mem, true);
+		if (err) {
+			pr_debug("Sync memory failed, wait interrupted by user signal\n");
+			goto sync_memory_failed;
+		}
 
-	/* Flush TLBs after waiting for the page table updates to complete */
-	for (i = 0; i < args->n_devices; i++) {
-		peer = kfd_device_by_id(devices_arr[i]);
-		if (WARN_ON_ONCE(!peer))
-			continue;
-		peer_pdd = kfd_get_process_device_data(peer, p);
-		if (WARN_ON_ONCE(!peer_pdd))
-			continue;
-		kfd_flush_tlb(peer_pdd, TLB_FLUSH_HEAVYWEIGHT);
+		/* Flush TLBs after waiting for the page table updates to complete */
+		for (i = 0; i < args->n_devices; i++) {
+			peer = kfd_device_by_id(devices_arr[i]);
+			if (WARN_ON_ONCE(!peer))
+				continue;
+			peer_pdd = kfd_get_process_device_data(peer, p);
+			if (WARN_ON_ONCE(!peer_pdd))
+				continue;
+			kfd_flush_tlb(peer_pdd, TLB_FLUSH_HEAVYWEIGHT);
+		}
 	}
-
 	kfree(devices_arr);
 
 	return 0;