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From: Felix Kuehling <Felix.Kuehling@amd.com>
To: amd-gfx@lists.freedesktop.org
Cc: jay.cornwall@amd.com, christian.koenig@amd.com
Subject: [PATCH 1/1] drm/amdgpu: Sync with VM root BO when switching VM to CPU update mode
Date: Wed, 20 May 2020 18:51:59 -0400	[thread overview]
Message-ID: <20200520225159.977-1-Felix.Kuehling@amd.com> (raw)

This fixes an intermittent bug where a root PD clear operation still in
progress could overwrite a PDE update done by the CPU, resulting in a
VM fault.

Fixes: 108b4d928c03 ("drm/amd/amdgpu: Update VM function pointer")
Reported-by: Jay Cornwall <Jay.Cornwall@amd.com>
Tested-by: Jay Cornwall <Jay.Cornwall@amd.com>
Signed-off-by: Felix Kuehling <Felix.Kuehling@amd.com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c | 11 +++++++++--
 1 file changed, 9 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
index 414a0b1c2e5a..7417754e9141 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm.c
@@ -3000,10 +3000,17 @@ int amdgpu_vm_make_compute(struct amdgpu_device *adev, struct amdgpu_vm *vm,
 		   !amdgpu_gmc_vram_full_visible(&adev->gmc)),
 		  "CPU update of VM recommended only for large BAR system\n");
 
-	if (vm->use_cpu_for_update)
+	if (vm->use_cpu_for_update) {
+		/* Sync with last SDMA update/clear before switching to CPU */
+		r = amdgpu_bo_sync_wait(vm->root.base.bo,
+					AMDGPU_FENCE_OWNER_UNDEFINED, true);
+		if (r)
+			goto free_idr;
+
 		vm->update_funcs = &amdgpu_vm_cpu_funcs;
-	else
+	} else {
 		vm->update_funcs = &amdgpu_vm_sdma_funcs;
+	}
 	dma_fence_put(vm->last_update);
 	vm->last_update = NULL;
 	vm->is_compute_context = true;
-- 
2.17.1

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             reply	other threads:[~2020-05-20 22:52 UTC|newest]

Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-05-20 22:51 Felix Kuehling [this message]
2020-05-21 13:50 ` [PATCH 1/1] drm/amdgpu: Sync with VM root BO when switching VM to CPU update mode Christian König
2020-05-21 17:06   ` Felix Kuehling
2020-05-22  8:59     ` Christian König

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