[V2 05/11] drm/amdgpu/virt: add high level interfaces for virt

[Alexander.Deucher@xxxxxxx (Deucher, Alexander)]

> -----Original Message-----
> From: amd-gfx [mailto:amd-gfx-bounces at lists.freedesktop.org] On Behalf
> Of Xiangliang Yu
> Sent: Tuesday, January 10, 2017 5:01 AM
> To: amd-gfx at lists.freedesktop.org
> Cc: Yu, Xiangliang
> Subject: [V2 05/11] drm/amdgpu/virt: add high level interfaces for virt
> 
> Add high level interfaces that is not relate to specific asic. So
> asic files just need to implement the interfaces to support
> virtualization.
> 
> Signed-off-by: Xiangliang Yu <Xiangliang.Yu at amd.com>

Reviewed-by: Alex Deucher <alexander.deucher at amd.com>

> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c | 57
> ++++++++++++++++++++++++++++++++
>  drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h | 15 +++++++++
>  2 files changed, 72 insertions(+)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
> index 6520a4e..f32a789 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
> @@ -84,3 +84,60 @@ void amdgpu_virt_kiq_wreg(struct amdgpu_device
> *adev, uint32_t reg, uint32_t v)
>  		DRM_ERROR("wait for kiq fence error: %ld.\n", r);
>  	fence_put(f);
>  }
> +
> +/**
> + * amdgpu_virt_request_full_gpu() - request full gpu access
> + * @amdgpu:	amdgpu device.
> + * @init:	is driver init time.
> + * When start to init/fini driver, first need to request full gpu access.
> + * Return: Zero if request success, otherwise will return error.
> + */
> +int amdgpu_virt_request_full_gpu(struct amdgpu_device *adev, bool init)
> +{
> +	struct amdgpu_virt *virt = &adev->virt;
> +
> +	if (virt->ops && virt->ops->req_full_gpu) {
> +		adev->virt.caps &= ~AMDGPU_SRIOV_CAPS_RUNTIME;
> +		return virt->ops->req_full_gpu(adev, init);
> +	}
> +
> +	return 0;
> +}
> +
> +/**
> + * amdgpu_virt_release_full_gpu() - release full gpu access
> + * @amdgpu:	amdgpu device.
> + * @init:	is driver init time.
> + * When finishing driver init/fini, need to release full gpu access.
> + * Return: Zero if release success, otherwise will returen error.
> + */
> +int amdgpu_virt_release_full_gpu(struct amdgpu_device *adev, bool init)
> +{
> +	struct amdgpu_virt *virt = &adev->virt;
> +	int r;
> +
> +	if (virt->ops && virt->ops->rel_full_gpu) {
> +		r = virt->ops->rel_full_gpu(adev, init);
> +		adev->virt.caps |= AMDGPU_SRIOV_CAPS_RUNTIME;
> +		return r;
> +	}
> +	return 0;
> +}
> +
> +/**
> + * amdgpu_virt_reset_gpu() - reset gpu
> + * @amdgpu:	amdgpu device.
> + * Send reset command to GPU hypervisor to reset GPU that VM is using
> + * Return: Zero if reset success, otherwise will return error.
> + */
> +int amdgpu_virt_reset_gpu(struct amdgpu_device *adev)
> +{
> +	struct amdgpu_virt *virt = &adev->virt;
> +
> +	if (virt->ops && virt->ops->reset_gpu) {
> +		adev->virt.caps &= ~AMDGPU_SRIOV_CAPS_RUNTIME;
> +		return virt->ops->reset_gpu(adev);
> +	}
> +
> +	return 0;
> +}
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
> b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
> index 24f0590..3f8fc0f 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.h
> @@ -29,11 +29,23 @@
>  #define AMDGPU_SRIOV_CAPS_IS_VF        (1 << 2) /* this GPU is a virtual
> function */
>  #define AMDGPU_PASSTHROUGH_MODE        (1 << 3) /* thw whole GPU is
> pass through for VM */
>  #define AMDGPU_SRIOV_CAPS_RUNTIME      (1 << 4) /* is out of full access
> mode */
> +
> +/**
> + * struct amdgpu_virt_ops - amdgpu device virt operations
> + */
> +struct amdgpu_virt_ops {
> +	int (*req_full_gpu)(struct amdgpu_device *adev, bool init);
> +	int (*rel_full_gpu)(struct amdgpu_device *adev, bool init);
> +	int (*reset_gpu)(struct amdgpu_device *adev);
> +};
> +
>  /* GPU virtualization */
>  struct amdgpu_virt {
>  	uint32_t		caps;
>  	uint32_t		val_offs;
>  	struct mutex		lock;
> +
> +	const struct amdgpu_virt_ops	*ops;
>  };
> 
>  #define amdgpu_sriov_enabled(adev) \
> @@ -63,5 +75,8 @@ static inline bool is_virtual_machine(void)
>  void amdgpu_virt_init_setting(struct amdgpu_device *adev);
>  uint32_t amdgpu_virt_kiq_rreg(struct amdgpu_device *adev, uint32_t reg);
>  void amdgpu_virt_kiq_wreg(struct amdgpu_device *adev, uint32_t reg,
> uint32_t v);
> +int amdgpu_virt_request_full_gpu(struct amdgpu_device *adev, bool init);
> +int amdgpu_virt_release_full_gpu(struct amdgpu_device *adev, bool init);
> +int amdgpu_virt_reset_gpu(struct amdgpu_device *adev);
> 
>  #endif
> --
> 2.7.4
> 
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