[PATCH 4/5] drm/amdgpu: Initialize Aldebaran RLC function pointers

[Skvortsov, Victor]

[AMD Official Use Only]

Hey Alex,

This change was based on the fact that amd-mainline-dkms-5.13 calls get_xgmi_info() in gmc_v9_0_early_init(). But I can see that drm-next it's instead called in gmc_v9_0_sw_init(). So, I'm not sure whats the correct behavior. But I do agree that the change is kind of ugly. I don't know where else to put it if we do need to call get_xgmi_info() in early_init.

Thanks,
Victor

-----Original Message-----
From: Alex Deucher <alexdeucher at gmail.com> 
Sent: Wednesday, December 15, 2021 4:38 PM
To: Skvortsov, Victor <Victor.Skvortsov at amd.com>
Cc: amd-gfx list <amd-gfx at lists.freedesktop.org>; Deng, Emily <Emily.Deng at amd.com>; Liu, Monk <Monk.Liu at amd.com>; Ming, Davis <Davis.Ming at amd.com>; Liu, Shaoyun <Shaoyun.Liu at amd.com>; Zhou, Peng Ju <PengJu.Zhou at amd.com>; Chen, JingWen <JingWen.Chen2 at amd.com>; Chen, Horace <Horace.Chen at amd.com>; Nieto, David M <David.Nieto at amd.com>
Subject: Re: [PATCH 4/5] drm/amdgpu: Initialize Aldebaran RLC function pointers

[CAUTION: External Email]

On Wed, Dec 15, 2021 at 1:56 PM Victor Skvortsov <victor.skvortsov at amd.com> wrote:
>
> In SRIOV, RLC function pointers must be initialized early as we rely 
> on the RLCG interface for all GC register access.
>
> Signed-off-by: Victor Skvortsov <victor.skvortsov at amd.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c | 2 ++
>  drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c         | 3 +--
>  drivers/gpu/drm/amd/amdgpu/gfx_v9_0.h         | 2 ++
>  3 files changed, 5 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c 
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
> index 65e1f6cc59dd..1bc92a38d124 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_discovery.c
> @@ -844,6 +844,8 @@ static int amdgpu_discovery_set_gc_ip_blocks(struct amdgpu_device *adev)
>         case IP_VERSION(9, 4, 1):
>         case IP_VERSION(9, 4, 2):
>                 amdgpu_device_ip_block_add(adev, &gfx_v9_0_ip_block);
> +               if (amdgpu_sriov_vf(adev) && adev->ip_versions[GC_HWIP][0] == IP_VERSION(9, 4, 2))
> +                       gfx_v9_0_set_rlc_funcs(adev);

amdgpu_discovery.c is IP independent.  I'd rather not add random IP specific function calls.  gfx_v9_0_set_rlc_funcs() already gets called in gfx_v9_0_early_init().  Is that not early enough?  In general we shouldn't be touching the hardware much if at all in early_init.

Alex

>                 break;
>         case IP_VERSION(10, 1, 10):
>         case IP_VERSION(10, 1, 2):
> diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c 
> b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
> index edb3e3b08eed..d252b06efa43 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.c
> @@ -816,7 +816,6 @@ static void gfx_v9_0_sriov_wreg(struct 
> amdgpu_device *adev, u32 offset,  static void 
> gfx_v9_0_set_ring_funcs(struct amdgpu_device *adev);  static void 
> gfx_v9_0_set_irq_funcs(struct amdgpu_device *adev);  static void 
> gfx_v9_0_set_gds_init(struct amdgpu_device *adev); -static void 
> gfx_v9_0_set_rlc_funcs(struct amdgpu_device *adev);  static int gfx_v9_0_get_cu_info(struct amdgpu_device *adev,
>                                 struct amdgpu_cu_info *cu_info);  
> static uint64_t gfx_v9_0_get_gpu_clock_counter(struct amdgpu_device 
> *adev); @@ -7066,7 +7065,7 @@ static void gfx_v9_0_set_irq_funcs(struct amdgpu_device *adev)
>         adev->gfx.cp_ecc_error_irq.funcs = 
> &gfx_v9_0_cp_ecc_error_irq_funcs;  }
>
> -static void gfx_v9_0_set_rlc_funcs(struct amdgpu_device *adev)
> +void gfx_v9_0_set_rlc_funcs(struct amdgpu_device *adev)
>  {
>         switch (adev->ip_versions[GC_HWIP][0]) {
>         case IP_VERSION(9, 0, 1):
> diff --git a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.h 
> b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.h
> index dfe8d4841f58..1817e252354f 100644
> --- a/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.h
> +++ b/drivers/gpu/drm/amd/amdgpu/gfx_v9_0.h
> @@ -29,4 +29,6 @@ extern const struct amdgpu_ip_block_version 
> gfx_v9_0_ip_block;  void gfx_v9_0_select_se_sh(struct amdgpu_device *adev, u32 se_num, u32 sh_num,
>                            u32 instance);
>
> +void gfx_v9_0_set_rlc_funcs(struct amdgpu_device *adev);
> +
>  #endif
> --
> 2.25.1
>