[PATCH v4 10/23] iommufd/viommu: Introduce IOMMUFD_OBJ_HW_QUEUE and its related struct

[Jason Gunthorpe]

On Thu, May 08, 2025 at 08:02:31PM -0700, Nicolin Chen wrote:
> +#define iommufd_hw_queue_alloc(viommu, drv_struct, member)                     \
> +	({                                                                     \
> +		drv_struct *ret;                                               \
> +									       \
> +		static_assert(__same_type(struct iommufd_viommu, *viommu));    \
> +		static_assert(__same_type(struct iommufd_hw_queue,             \
> +					  ((drv_struct *)NULL)->member));      \
> +		static_assert(offsetof(drv_struct, member.obj) == 0);          \
> +		ret = (drv_struct *)_iommufd_object_alloc(                     \
> +			viommu->ictx, sizeof(drv_struct),                      \
> +			IOMMUFD_OBJ_HW_QUEUE);                                 \
> +		if (!IS_ERR(ret)) {                                            \
> +			ret->member.viommu = viommu;                           \
> +			ret->member.ictx = viommu->ictx;                       \
> +		}                                                              \
> +		ret;                                                           \
> +	})

This should just call 

__iommufd_object_alloc(viommu->ictx, ret, IOMMUFD_OBJ_HW_QUEUE member.obj)

And all the casting and asserts should be in that macro, move it to
this header

>  /* Helper for IOMMU driver to destroy structures created by allocators above */
>  #define iommufd_struct_destroy(drv_struct, member)                             \
>  	({                                                                     \

This is abort not destroy, the names should be consistent. But looking
more at the series I think it will be better to do the little rework I
suggested and not give this function to the driver in the first place.

Jason