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From: Eric Huang <jinhuieric.huang@amd.com>
To: "amd-gfx@lists.freedesktop.org" <amd-gfx@lists.freedesktop.org>
Subject: [PATCH] drm/amdgpu: Don't flush HDP on A+A
Date: Tue, 25 May 2021 13:56:32 -0400	[thread overview]
Message-ID: <92d943b2-7a72-e1a2-f29c-b5b54cf80d20@amd.com> (raw)

With XGMI connection flushing HDP on PCIe is unnecessary,
it is also to optimize memory allocation latency.

Signed-off-by: Eric Huang <jinhuieric.huang@amd.com>

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_cpu.c 
b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_cpu.c
index ac45d9c7a4e9..aefb3d2927d5 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_cpu.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_vm_cpu.c
@@ -108,6 +108,8 @@ static int amdgpu_vm_cpu_update(struct 
amdgpu_vm_update_params *p,
  static int amdgpu_vm_cpu_commit(struct amdgpu_vm_update_params *p,
                                 struct dma_fence **fence)
  {
+       if (p->adev->gmc.xgmi.connected_to_cpu)
+               return 0;
         /* Flush HDP */
         mb();
         amdgpu_asic_flush_hdp(p->adev, NULL);
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             reply	other threads:[~2021-05-25 17:56 UTC|newest]

Thread overview: 6+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-25 17:56 Eric Huang [this message]
2021-05-26 13:55 ` [PATCH] drm/amdgpu: Don't flush HDP on A+A Felix Kuehling
2021-05-27 12:14   ` Christian König
2021-05-26 13:58 ` Christian König
2021-05-31 15:51 Eric Huang
2021-05-31 19:40 ` Christian König

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