linux-kernel - RE: [PATCH AUTOSEL 6.4 10/11] drm/amdkfd: disable IOMMUv2 support for KV/CZ

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Message-ID: <BN9PR12MB5146C9B54B9D21CFA0751890F71FA@BN9PR12MB5146.namprd12.prod.outlook.com>
Date:   Tue, 22 Aug 2023 15:39:11 +0000
From:   "Deucher, Alexander" <Alexander.Deucher@....com>
To:     Sasha Levin <sashal@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
CC:     "Kuehling, Felix" <Felix.Kuehling@....com>,
        "Koenig, Christian" <Christian.Koenig@....com>,
        Mike Lothian <mike@...eburn.co.uk>,
        "Pan, Xinhui" <Xinhui.Pan@....com>,
        "airlied@...il.com" <airlied@...il.com>,
        "daniel@...ll.ch" <daniel@...ll.ch>,
        "amd-gfx@...ts.freedesktop.org" <amd-gfx@...ts.freedesktop.org>,
        "dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>
Subject: RE: [PATCH AUTOSEL 6.4 10/11] drm/amdkfd: disable IOMMUv2 support for
 KV/CZ

[Public]

> -----Original Message-----
> From: Sasha Levin <sashal@...nel.org>
> Sent: Tuesday, August 22, 2023 7:36 AM
> To: linux-kernel@...r.kernel.org; stable@...r.kernel.org
> Cc: Deucher, Alexander <Alexander.Deucher@....com>; Kuehling, Felix
> <Felix.Kuehling@....com>; Koenig, Christian <Christian.Koenig@....com>;
> Mike Lothian <mike@...eburn.co.uk>; Sasha Levin <sashal@...nel.org>; Pan,
> Xinhui <Xinhui.Pan@....com>; airlied@...il.com; daniel@...ll.ch; amd-
> gfx@...ts.freedesktop.org; dri-devel@...ts.freedesktop.org
> Subject: [PATCH AUTOSEL 6.4 10/11] drm/amdkfd: disable IOMMUv2
> support for KV/CZ
>
> From: Alex Deucher <alexander.deucher@....com>
>
> [ Upstream commit 616f92d188ee7142a95a52068efdbea82645f859 ]
>
> Use the dGPU path instead.  There were a lot of platform issues with IOMMU
> in general on these chips due to windows not enabling IOMMU at the time.
> The dGPU path has been used for a long time with newer APUs and works
> fine.  This also paves the way to simplify the driver significantly.
>
> v2: use the dGPU queue manager functions

This is not needed for stable.

Alex

>
> Reviewed-by: Felix Kuehling <Felix.Kuehling@....com>
> Acked-by: Christian König <christian.koenig@....com>
> Tested-by: Mike Lothian <mike@...eburn.co.uk>
> Signed-off-by: Alex Deucher <alexander.deucher@....com>
> Signed-off-by: Sasha Levin <sashal@...nel.org>
> ---
>  drivers/gpu/drm/amd/amdkfd/kfd_device.c               | 6 ------
>  drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c | 8 +-------
>  2 files changed, 1 insertion(+), 13 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device.c
> b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
> index 00f528eb98126..9c8197573dee7 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_device.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_device.c
> @@ -224,10 +224,6 @@ static void kfd_device_info_init(struct kfd_dev *kfd,
>                   asic_type != CHIP_TONGA)
>                       kfd->device_info.supports_cwsr = true;
>
> -             if (asic_type == CHIP_KAVERI ||
> -                 asic_type == CHIP_CARRIZO)
> -                     kfd->device_info.needs_iommu_device = true;
> -
>               if (asic_type != CHIP_HAWAII && !vf)
>                       kfd->device_info.needs_pci_atomics = true;
>       }
> @@ -240,7 +236,6 @@ struct kfd_dev *kgd2kfd_probe(struct
> amdgpu_device *adev, bool vf)
>       uint32_t gfx_target_version = 0;
>
>       switch (adev->asic_type) {
> -#ifdef KFD_SUPPORT_IOMMU_V2
>  #ifdef CONFIG_DRM_AMDGPU_CIK
>       case CHIP_KAVERI:
>               gfx_target_version = 70000;
> @@ -253,7 +248,6 @@ struct kfd_dev *kgd2kfd_probe(struct
> amdgpu_device *adev, bool vf)
>               if (!vf)
>                       f2g = &gfx_v8_kfd2kgd;
>               break;
> -#endif
>  #ifdef CONFIG_DRM_AMDGPU_CIK
>       case CHIP_HAWAII:
>               gfx_target_version = 70001;
> diff --git a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> index 7a95698d83f73..c73417e79745e 100644
> --- a/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> +++ b/drivers/gpu/drm/amd/amdkfd/kfd_device_queue_manager.c
> @@ -2335,18 +2335,12 @@ struct device_queue_manager
> *device_queue_manager_init(struct kfd_dev *dev)
>       }
>
>       switch (dev->adev->asic_type) {
> -     case CHIP_CARRIZO:
> -             device_queue_manager_init_vi(&dqm->asic_ops);
> -             break;
> -
>       case CHIP_KAVERI:
> -             device_queue_manager_init_cik(&dqm->asic_ops);
> -             break;
> -
>       case CHIP_HAWAII:
>               device_queue_manager_init_cik_hawaii(&dqm->asic_ops);
>               break;
>
> +     case CHIP_CARRIZO:
>       case CHIP_TONGA:
>       case CHIP_FIJI:
>       case CHIP_POLARIS10:
> --
> 2.40.1