[PATCH] drm/amd/amdgpu: Fix the CGCG setting is overwritten for SRIOV.

[Liu, Monk]

Sounds a good idea

@Wan, Gavin can you try hawking's advice ?

_____________________________________
Monk Liu|GPU Virtualization Team |AMD


-----Original Message-----
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Zhang, Hawking
Sent: Friday, May 22, 2020 1:09 PM
To: Chen, Guchun <Guchun.Chen at amd.com>; Wan, Gavin <Gavin.Wan at amd.com>; amd-gfx at lists.freedesktop.org
Cc: Wan, Gavin <Gavin.Wan at amd.com>
Subject: RE: [PATCH] drm/amd/amdgpu: Fix the CGCG setting is overwritten for SRIOV.

[AMD Public Use]

Can we leverage existing CG flags to control this rather than add amdgpu_sriov_vf(adev) check everywhere?

If GC CG feature is programmed by host. We can just mask out the following flags for guest driver case (amdgpu_sriov_vf(adev)).

AMD_CG_SUPPORT_GFX_MGCG |
	     AMD_CG_SUPPORT_GFX_CGLS |
	     AMD_CG_SUPPORT_GFX_CGCG |
	     AMD_CG_SUPPORT_GFX_CGLS |
	     AMD_CG_SUPPORT_GFX_3D_CGCG |
	     AMD_CG_SUPPORT_GFX_3D_CGLS

There are too many amdgpu_sriov_vf(adev) Check in amdgpu driver, which actually add unnecessary sustaining effort.

Regards,
Hawking

-----Original Message-----
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Chen, Guchun
Sent: Friday, May 22, 2020 11:47
To: Wan, Gavin <Gavin.Wan at amd.com>; amd-gfx at lists.freedesktop.org
Cc: Wan, Gavin <Gavin.Wan at amd.com>
Subject: RE: [PATCH] drm/amd/amdgpu: Fix the CGCG setting is overwritten for SRIOV.

[AMD Public Use]

Please see one comment below.

Regards,
Guchun

-----Original Message-----
From: amd-gfx <amd-gfx-bounces at lists.freedesktop.org> On Behalf Of Gavin Wan
Sent: Friday, May 22, 2020 3:53 AM
To: amd-gfx at lists.freedesktop.org
Cc: Wan, Gavin <Gavin.Wan at amd.com>
Subject: [PATCH] drm/amd/amdgpu: Fix the CGCG setting is overwritten for SRIOV.

For SRIOV, since the CGCG is set on host side. The Guest should not program CGCG again.

The patch ignores setting CGCG for SRIOV.

Change-Id: Ic336fab3b23b8371c9e9e192182a3ba14a8db8e1
Signed-off-by: Gavin Wan <Gavin.Wan at amd.com>
---
 drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
index bd5dd4f64311..52b6e4759cf3 100644
--- a/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
+++ b/drivers/gpu/drm/amd/amdgpu/gfx_v10_0.c
@@ -4558,6 +4558,9 @@ static void gfx_v10_0_constants_init(struct amdgpu_device *adev)  static void gfx_v10_0_enable_gui_idle_interrupt(struct amdgpu_device *adev,
 					       bool enable)
 {
+	if (amdgpu_sriov_vf(adev))
+		return;
+
[Guchun]This coding style is not correct. You should put the check after the declare of 'u32 tmp'.
Maybe it's better to split below line to declare and execution parts respectively.

 	u32 tmp = RREG32_SOC15(GC, 0, mmCP_INT_CNTL_RING0);
 
 	tmp = REG_SET_FIELD(tmp, CP_INT_CNTL_RING0, CNTX_BUSY_INT_ENABLE, @@ -6842,6 +6845,9 @@ static void gfx_v10_0_update_medium_grain_clock_gating(struct amdgpu_device *ade  {
 	uint32_t data, def;
 
+	if (amdgpu_sriov_vf(adev))
+		return;
+
 	/* It is disabled by HW by default */
 	if (enable && (adev->cg_flags & AMD_CG_SUPPORT_GFX_MGCG)) {
 		/* 0 - Disable some blocks' MGCG */
@@ -6911,6 +6917,9 @@ static void gfx_v10_0_update_3d_clock_gating(struct amdgpu_device *adev,  {
 	uint32_t data, def;
 
+	if (amdgpu_sriov_vf(adev))
+		return;
+
 	/* Enable 3D CGCG/CGLS */
 	if (enable && (adev->cg_flags & AMD_CG_SUPPORT_GFX_3D_CGCG)) {
 		/* write cmd to clear cgcg/cgls ov */ @@ -6953,6 +6962,9 @@ static void gfx_v10_0_update_coarse_grain_clock_gating(struct amdgpu_device *ade  {
 	uint32_t def, data;
 
+	if (amdgpu_sriov_vf(adev))
+		return;
+
 	if (enable && (adev->cg_flags & AMD_CG_SUPPORT_GFX_CGCG)) {
 		def = data = RREG32_SOC15(GC, 0, mmRLC_CGTT_MGCG_OVERRIDE);
 		/* unset CGCG override */
@@ -6994,6 +7006,9 @@ static void gfx_v10_0_update_coarse_grain_clock_gating(struct amdgpu_device *ade  static int gfx_v10_0_update_gfx_clock_gating(struct amdgpu_device *adev,
 					    bool enable)
 {
+	if (amdgpu_sriov_vf(adev))
+		return;
+
 	amdgpu_gfx_rlc_enter_safe_mode(adev);
 
 	if (enable) {
--
2.25.1

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