RE: [PATCH] drm/amdkfd: Only apply heavy-weight TLB flush on Aldebaran

["Chen, Guchun" <Guchun.Chen@xxxxxxx>]

[Public]

Original patch will cause regressions on Aldebaran as well, so this workaround is still invalid.

Regards,
Guchun

-----Original Message-----
From: amd-gfx <amd-gfx-bounces@xxxxxxxxxxxxxxxxxxxxx> On Behalf Of Eric Huang
Sent: Friday, July 9, 2021 3:54 AM
To: amd-gfx@xxxxxxxxxxxxxxxxxxxxx
Cc: Huang, JinHuiEric <JinHuiEric.Huang@xxxxxxx>; Kuehling, Felix <Felix.Kuehling@xxxxxxx>
Subject: [PATCH] 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:
  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@xxxxxxx>
---
 drivers/gpu/drm/amd/amdkfd/kfd_chardev.c | 37 +++++++++++++-----------
 1 file changed, 20 insertions(+), 17 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
index ebb4872c5a9d..5f2655cf0162 100644
--- a/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
+++ b/drivers/gpu/drm/amd/amdkfd/kfd_chardev.c
@@ -1773,26 +1773,29 @@ 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);
 
-	/* 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;
-		if (!amdgpu_read_lock(peer->ddev, true)) {
-			kfd_flush_tlb(peer_pdd, TLB_FLUSH_HEAVYWEIGHT);
-			amdgpu_read_unlock(peer->ddev);
+		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;
+			if (!amdgpu_read_lock(peer->ddev, true)) {
+				kfd_flush_tlb(peer_pdd, TLB_FLUSH_HEAVYWEIGHT);
+				amdgpu_read_unlock(peer->ddev);
+			}
+		}
+	}
 	kfree(devices_arr);
 
 	return 0;
--
2.25.1

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