linux-kernel - Re: [PATCH v2 12/22] wifi: ath11k: Use iommu_paging_domain

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Date: Tue, 4 Jun 2024 06:34:38 -0700
From: Jeff Johnson <quic_jjohnson@...cinc.com>
To: Lu Baolu <baolu.lu@...ux.intel.com>, Joerg Roedel <joro@...tes.org>,
        Will
 Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        Jason
 Gunthorpe <jgg@...pe.ca>, Kevin Tian <kevin.tian@...el.com>
CC: Yi Liu <yi.l.liu@...el.com>, David Airlie <airlied@...il.com>,
        Daniel
 Vetter <daniel@...ll.ch>, Kalle Valo <kvalo@...nel.org>,
        Bjorn Andersson
	<andersson@...nel.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Alex
 Williamson <alex.williamson@...hat.com>, <mst@...hat.com>,
        Jason Wang
	<jasowang@...hat.com>,
        Thierry Reding <thierry.reding@...il.com>,
        Jonathan
 Hunter <jonathanh@...dia.com>,
        Mikko Perttunen <mperttunen@...dia.com>, <iommu@...ts.linux.dev>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 12/22] wifi: ath11k: Use iommu_paging_domain_alloc()

On 6/3/24 18:51, Lu Baolu wrote:
> An iommu domain is allocated in ath11k_ahb_fw_resources_init() and is
> attached to ab_ahb->fw.dev in the same function.
> 
> Use iommu_paging_domain_alloc() to make it explicit.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>

Acked-by: Jeff Johnson <quic_jjohnson@...cinc.com>

> ---
>   drivers/net/wireless/ath/ath11k/ahb.c | 6 +++---
>   1 file changed, 3 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/wireless/ath/ath11k/ahb.c b/drivers/net/wireless/ath/ath11k/ahb.c
> index ca0f17ddebba..a469647719f9 100644
> --- a/drivers/net/wireless/ath/ath11k/ahb.c
> +++ b/drivers/net/wireless/ath/ath11k/ahb.c
> @@ -1001,10 +1001,10 @@ static int ath11k_ahb_fw_resources_init(struct ath11k_base *ab)
>   
>   	ab_ahb->fw.dev = &pdev->dev;
>   
> -	iommu_dom = iommu_domain_alloc(&platform_bus_type);
> -	if (!iommu_dom) {
> +	iommu_dom = iommu_paging_domain_alloc(ab_ahb->fw.dev);
> +	if (IS_ERR(iommu_dom)) {
>   		ath11k_err(ab, "failed to allocate iommu domain\n");
> -		ret = -ENOMEM;
> +		ret = PTR_ERR(iommu_dom);
>   		goto err_unregister;
>   	}
>