Re: [PATCH v2 16/18] vfio/gvt: Use mdev_get_type_group_id()

[Zhenyu Wang <zhenyuw@linux.intel.com>]

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On 2021.04.06 16:40:39 -0300, Jason Gunthorpe wrote:
> intel_gvt_init_vgpu_type_groups() makes gvt->types 1:1 with the
> supported_type_groups array, so the type_group_id is also the index into
> gvt->types. Use it directly and remove the string matching.
> 
> Reviewed-by: Kevin Tian <kevin.tian@intel.com>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
> Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>
> ---

Reviewed-by: Zhenyu Wang <zhenyuw@linux.intel.com>

For two gvt specific changes in this series, it's better to just merge through
vfio tree.

Thanks

>  drivers/gpu/drm/i915/gvt/gvt.c   | 24 +++++++-----------------
>  drivers/gpu/drm/i915/gvt/gvt.h   |  4 ++--
>  drivers/gpu/drm/i915/gvt/kvmgt.c |  5 ++---
>  3 files changed, 11 insertions(+), 22 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/gvt/gvt.c b/drivers/gpu/drm/i915/gvt/gvt.c
> index d1d8ee4a5f16a3..4b47a18e9dfa0f 100644
> --- a/drivers/gpu/drm/i915/gvt/gvt.c
> +++ b/drivers/gpu/drm/i915/gvt/gvt.c
> @@ -46,22 +46,12 @@ static const char * const supported_hypervisors[] = {
>  	[INTEL_GVT_HYPERVISOR_KVM] = "KVM",
>  };
>  
> -static struct intel_vgpu_type *intel_gvt_find_vgpu_type(struct intel_gvt *gvt,
> -		const char *name)
> +static struct intel_vgpu_type *
> +intel_gvt_find_vgpu_type(struct intel_gvt *gvt, unsigned int type_group_id)
>  {
> -	const char *driver_name =
> -		dev_driver_string(&gvt->gt->i915->drm.pdev->dev);
> -	int i;
> -
> -	name += strlen(driver_name) + 1;
> -	for (i = 0; i < gvt->num_types; i++) {
> -		struct intel_vgpu_type *t = &gvt->types[i];
> -
> -		if (!strncmp(t->name, name, sizeof(t->name)))
> -			return t;
> -	}
> -
> -	return NULL;
> +	if (WARN_ON(type_group_id >= gvt->num_types))
> +		return NULL;
> +	return &gvt->types[type_group_id];
>  }
>  
>  static ssize_t available_instances_show(struct kobject *kobj,
> @@ -71,7 +61,7 @@ static ssize_t available_instances_show(struct kobject *kobj,
>  	unsigned int num = 0;
>  	void *gvt = kdev_to_i915(dev)->gvt;
>  
> -	type = intel_gvt_find_vgpu_type(gvt, kobject_name(kobj));
> +	type = intel_gvt_find_vgpu_type(gvt, mtype_get_type_group_id(kobj));
>  	if (!type)
>  		num = 0;
>  	else
> @@ -92,7 +82,7 @@ static ssize_t description_show(struct kobject *kobj, struct device *dev,
>  	struct intel_vgpu_type *type;
>  	void *gvt = kdev_to_i915(dev)->gvt;
>  
> -	type = intel_gvt_find_vgpu_type(gvt, kobject_name(kobj));
> +	type = intel_gvt_find_vgpu_type(gvt, mtype_get_type_group_id(kobj));
>  	if (!type)
>  		return 0;
>  
> diff --git a/drivers/gpu/drm/i915/gvt/gvt.h b/drivers/gpu/drm/i915/gvt/gvt.h
> index 03c993d68f105a..0cf480f42850d2 100644
> --- a/drivers/gpu/drm/i915/gvt/gvt.h
> +++ b/drivers/gpu/drm/i915/gvt/gvt.h
> @@ -569,8 +569,8 @@ struct intel_gvt_ops {
>  	void (*vgpu_reset)(struct intel_vgpu *);
>  	void (*vgpu_activate)(struct intel_vgpu *);
>  	void (*vgpu_deactivate)(struct intel_vgpu *);
> -	struct intel_vgpu_type *(*gvt_find_vgpu_type)(struct intel_gvt *gvt,
> -			const char *name);
> +	struct intel_vgpu_type *(*gvt_find_vgpu_type)(
> +		struct intel_gvt *gvt, unsigned int type_group_id);
>  	bool (*get_gvt_attrs)(struct attribute_group ***intel_vgpu_type_groups);
>  	int (*vgpu_query_plane)(struct intel_vgpu *vgpu, void *);
>  	int (*vgpu_get_dmabuf)(struct intel_vgpu *vgpu, unsigned int);
> diff --git a/drivers/gpu/drm/i915/gvt/kvmgt.c b/drivers/gpu/drm/i915/gvt/kvmgt.c
> index b4348256ae9591..16e1e4a38aa1f6 100644
> --- a/drivers/gpu/drm/i915/gvt/kvmgt.c
> +++ b/drivers/gpu/drm/i915/gvt/kvmgt.c
> @@ -700,10 +700,9 @@ static int intel_vgpu_create(struct kobject *kobj, struct mdev_device *mdev)
>  	pdev = mdev_parent_dev(mdev);
>  	gvt = kdev_to_i915(pdev)->gvt;
>  
> -	type = intel_gvt_ops->gvt_find_vgpu_type(gvt, kobject_name(kobj));
> +	type = intel_gvt_ops->gvt_find_vgpu_type(gvt,
> +						 mdev_get_type_group_id(mdev));
>  	if (!type) {
> -		gvt_vgpu_err("failed to find type %s to create\n",
> -						kobject_name(kobj));
>  		ret = -EINVAL;
>  		goto out;
>  	}
> -- 
> 2.31.1
> 

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