Re: [PATCH v4 19/19] iommu: Remove detach_dev callback

[Jason Gunthorpe <jgg@nvidia.com>]

On Wed, Jan 04, 2023 at 08:57:25PM +0800, Lu Baolu wrote:
> The detach_dev callback of domain ops is not called in the IOMMU core.
> Remove this callback to avoid dead code. The trace event for detaching
> domain from device is removed accordingly.
> 
> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
> ---
>  include/linux/iommu.h        |  2 --
>  include/trace/events/iommu.h |  7 -------
>  drivers/iommu/iommu-traces.c |  1 -
>  drivers/iommu/iommu.c        | 29 +++++------------------------
>  4 files changed, 5 insertions(+), 34 deletions(-)
> 
> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index 0d10566b3cb2..a8063f26ff69 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -299,7 +299,6 @@ struct iommu_ops {
>   * * EBUSY	- device is attached to a domain and cannot be changed
>   * * ENODEV	- device specific errors, not able to be attached
>   * * <others>	- treated as ENODEV by the caller. Use is discouraged
> - * @detach_dev: detach an iommu domain from a device
>   * @set_dev_pasid: set an iommu domain to a pasid of device
>   * @map: map a physically contiguous memory region to an iommu domain
>   * @map_pages: map a physically contiguous set of pages of the same size to
> @@ -320,7 +319,6 @@ struct iommu_ops {
>   */
>  struct iommu_domain_ops {
>  	int (*attach_dev)(struct iommu_domain *domain, struct device *dev);
> -	void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
>  	int (*set_dev_pasid)(struct iommu_domain *domain, struct device *dev,
>  			     ioasid_t pasid);
>  
> diff --git a/include/trace/events/iommu.h b/include/trace/events/iommu.h
> index 29096fe12623..70743db1fb75 100644
> --- a/include/trace/events/iommu.h
> +++ b/include/trace/events/iommu.h
> @@ -76,13 +76,6 @@ DEFINE_EVENT(iommu_device_event, attach_device_to_domain,
>  	TP_ARGS(dev)
>  );
>  
> -DEFINE_EVENT(iommu_device_event, detach_device_from_domain,
> -
> -	TP_PROTO(struct device *dev),
> -
> -	TP_ARGS(dev)
> -);
> -

did you want to add a trace for the set_platform_dma_ops in the
earlier patch?

Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>

Jason