Re: [PATCH 15/19] drm/msm: Add support for private address space instances

[Bjorn Andersson <bjorn.andersson@linaro.org>]

On Thu 13 Aug 21:41 CDT 2020, Rob Clark wrote:

> From: Jordan Crouse <jcrouse@codeaurora.org>
> 
> Add support for allocating private address space instances. Targets that
> support per-context pagetables should implement their own function to
> allocate private address spaces.
> 
> The default will return a pointer to the global address space.
> 

Reviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>

> Signed-off-by: Jordan Crouse <jcrouse@codeaurora.org>
> Signed-off-by: Rob Clark <robdclark@chromium.org>
> ---
>  drivers/gpu/drm/msm/msm_drv.c     | 13 +++++++------
>  drivers/gpu/drm/msm/msm_drv.h     |  5 +++++
>  drivers/gpu/drm/msm/msm_gem_vma.c |  9 +++++++++
>  drivers/gpu/drm/msm/msm_gpu.c     | 22 ++++++++++++++++++++++
>  drivers/gpu/drm/msm/msm_gpu.h     |  5 +++++
>  5 files changed, 48 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/msm/msm_drv.c b/drivers/gpu/drm/msm/msm_drv.c
> index 01845a3b8d52..8e70d220bba8 100644
> --- a/drivers/gpu/drm/msm/msm_drv.c
> +++ b/drivers/gpu/drm/msm/msm_drv.c
> @@ -597,7 +597,7 @@ static int context_init(struct drm_device *dev, struct drm_file *file)
>  	kref_init(&ctx->ref);
>  	msm_submitqueue_init(dev, ctx);
>  
> -	ctx->aspace = priv->gpu ? priv->gpu->aspace : NULL;
> +	ctx->aspace = msm_gpu_create_private_address_space(priv->gpu);
>  	file->driver_priv = ctx;
>  
>  	return 0;
> @@ -780,18 +780,19 @@ static int msm_ioctl_gem_cpu_fini(struct drm_device *dev, void *data,
>  }
>  
>  static int msm_ioctl_gem_info_iova(struct drm_device *dev,
> -		struct drm_gem_object *obj, uint64_t *iova)
> +		struct drm_file *file, struct drm_gem_object *obj,
> +		uint64_t *iova)
>  {
> -	struct msm_drm_private *priv = dev->dev_private;
> +	struct msm_file_private *ctx = file->driver_priv;
>  
> -	if (!priv->gpu)
> +	if (!ctx->aspace)
>  		return -EINVAL;
>  
>  	/*
>  	 * Don't pin the memory here - just get an address so that userspace can
>  	 * be productive
>  	 */
> -	return msm_gem_get_iova(obj, priv->gpu->aspace, iova);
> +	return msm_gem_get_iova(obj, ctx->aspace, iova);
>  }
>  
>  static int msm_ioctl_gem_info(struct drm_device *dev, void *data,
> @@ -830,7 +831,7 @@ static int msm_ioctl_gem_info(struct drm_device *dev, void *data,
>  		args->value = msm_gem_mmap_offset(obj);
>  		break;
>  	case MSM_INFO_GET_IOVA:
> -		ret = msm_ioctl_gem_info_iova(dev, obj, &args->value);
> +		ret = msm_ioctl_gem_info_iova(dev, file, obj, &args->value);
>  		break;
>  	case MSM_INFO_SET_NAME:
>  		/* length check should leave room for terminating null: */
> diff --git a/drivers/gpu/drm/msm/msm_drv.h b/drivers/gpu/drm/msm/msm_drv.h
> index 4561bfb5e745..2ca9c3c03845 100644
> --- a/drivers/gpu/drm/msm/msm_drv.h
> +++ b/drivers/gpu/drm/msm/msm_drv.h
> @@ -249,6 +249,10 @@ int msm_gem_map_vma(struct msm_gem_address_space *aspace,
>  void msm_gem_close_vma(struct msm_gem_address_space *aspace,
>  		struct msm_gem_vma *vma);
>  
> +
> +struct msm_gem_address_space *
> +msm_gem_address_space_get(struct msm_gem_address_space *aspace);
> +
>  void msm_gem_address_space_put(struct msm_gem_address_space *aspace);
>  
>  struct msm_gem_address_space *
> @@ -434,6 +438,7 @@ static inline void __msm_file_private_destroy(struct kref *kref)
>  	struct msm_file_private *ctx = container_of(kref,
>  		struct msm_file_private, ref);
>  
> +	msm_gem_address_space_put(ctx->aspace);
>  	kfree(ctx);
>  }
>  
> diff --git a/drivers/gpu/drm/msm/msm_gem_vma.c b/drivers/gpu/drm/msm/msm_gem_vma.c
> index 5f6a11211b64..29cc1305cf37 100644
> --- a/drivers/gpu/drm/msm/msm_gem_vma.c
> +++ b/drivers/gpu/drm/msm/msm_gem_vma.c
> @@ -27,6 +27,15 @@ void msm_gem_address_space_put(struct msm_gem_address_space *aspace)
>  		kref_put(&aspace->kref, msm_gem_address_space_destroy);
>  }
>  
> +struct msm_gem_address_space *
> +msm_gem_address_space_get(struct msm_gem_address_space *aspace)
> +{
> +	if (!IS_ERR_OR_NULL(aspace))
> +		kref_get(&aspace->kref);
> +
> +	return aspace;
> +}
> +
>  /* Actually unmap memory for the vma */
>  void msm_gem_purge_vma(struct msm_gem_address_space *aspace,
>  		struct msm_gem_vma *vma)
> diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
> index e1a3cbe25a0c..951850804d77 100644
> --- a/drivers/gpu/drm/msm/msm_gpu.c
> +++ b/drivers/gpu/drm/msm/msm_gpu.c
> @@ -823,6 +823,28 @@ static int get_clocks(struct platform_device *pdev, struct msm_gpu *gpu)
>  	return 0;
>  }
>  
> +/* Return a new address space for a msm_drm_private instance */
> +struct msm_gem_address_space *
> +msm_gpu_create_private_address_space(struct msm_gpu *gpu)
> +{
> +	struct msm_gem_address_space *aspace = NULL;
> +
> +	if (!gpu)
> +		return NULL;
> +
> +	/*
> +	 * If the target doesn't support private address spaces then return
> +	 * the global one
> +	 */
> +	if (gpu->funcs->create_private_address_space)
> +		aspace = gpu->funcs->create_private_address_space(gpu);
> +
> +	if (IS_ERR_OR_NULL(aspace))
> +		aspace = msm_gem_address_space_get(gpu->aspace);
> +
> +	return aspace;
> +}
> +
>  int msm_gpu_init(struct drm_device *drm, struct platform_device *pdev,
>  		struct msm_gpu *gpu, const struct msm_gpu_funcs *funcs,
>  		const char *name, struct msm_gpu_config *config)
> diff --git a/drivers/gpu/drm/msm/msm_gpu.h b/drivers/gpu/drm/msm/msm_gpu.h
> index 1f96ac0d9049..4052a18e18c2 100644
> --- a/drivers/gpu/drm/msm/msm_gpu.h
> +++ b/drivers/gpu/drm/msm/msm_gpu.h
> @@ -65,6 +65,8 @@ struct msm_gpu_funcs {
>  	void (*gpu_set_freq)(struct msm_gpu *gpu, struct dev_pm_opp *opp);
>  	struct msm_gem_address_space *(*create_address_space)
>  		(struct msm_gpu *gpu, struct platform_device *pdev);
> +	struct msm_gem_address_space *(*create_private_address_space)
> +		(struct msm_gpu *gpu);
>  };
>  
>  struct msm_gpu {
> @@ -295,6 +297,9 @@ int msm_gpu_init(struct drm_device *drm, struct platform_device *pdev,
>  		struct msm_gpu *gpu, const struct msm_gpu_funcs *funcs,
>  		const char *name, struct msm_gpu_config *config);
>  
> +struct msm_gem_address_space *
> +msm_gpu_create_private_address_space(struct msm_gpu *gpu);
> +
>  void msm_gpu_cleanup(struct msm_gpu *gpu);
>  
>  struct msm_gpu *adreno_load_gpu(struct drm_device *dev);
> -- 
> 2.26.2
>