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From b3e03fc1e3e59f737bd820241fcd7fb069d06183 Mon Sep 17 00:00:00 2001
From: Alex Deucher <alexander.deucher@amd.com>
Date: Tue, 27 Mar 2018 17:10:56 -0500
Subject: [PATCH 4191/5725] drm/amdgpu/gmc9: use
amdgpu_ring_emit_reg_write_reg_wait in gpu tlb flush
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
Use amdgpu_ring_emit_reg_write_reg_wait. On engines that support it,
it provides a write and wait in a single packet which avoids a missed
ack if a world switch happens between the request and waiting for the
ack.
Reviewed-by: Huang Rui <ray.huang@amd.com>
Reviewed-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
---
drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c | 8 +++-----
1 file changed, 3 insertions(+), 5 deletions(-)
diff --git a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
index 4017c9c..2d40733 100644
--- a/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gmc_v9_0.c
@@ -384,11 +384,9 @@ static uint64_t gmc_v9_0_emit_flush_gpu_tlb(struct amdgpu_ring *ring,
amdgpu_ring_emit_wreg(ring, hub->ctx0_ptb_addr_hi32 + (2 * vmid),
upper_32_bits(pd_addr));
- amdgpu_ring_emit_wreg(ring, hub->vm_inv_eng0_req + eng, req);
-
- /* wait for the invalidate to complete */
- amdgpu_ring_emit_reg_wait(ring, hub->vm_inv_eng0_ack + eng,
- 1 << vmid, 1 << vmid);
+ amdgpu_ring_emit_reg_write_reg_wait(ring, hub->vm_inv_eng0_req + eng,
+ hub->vm_inv_eng0_ack + eng,
+ req, 1 << vmid);
return pd_addr;
}
--
2.7.4
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