Re: [PATCH v1 6/8] gpu/host1x: Use iommu_attach/detach_device()

From: Jason Gunthorpe via iommu <iommu@lists.linux-foundation.org>
To: Lu Baolu <baolu.lu@linux.intel.com>
Cc: Stuart Yoder <stuyoder@gmail.com>,
	rafael@kernel.org, David Airlie <airlied@linux.ie>,
	linux-pci@vger.kernel.org,
	Thierry Reding <thierry.reding@gmail.com>,
	Diana Craciun <diana.craciun@oss.nxp.com>,
	Dmitry Osipenko <digetx@gmail.com>, Will Deacon <will@kernel.org>,
	Ashok Raj <ashok.raj@intel.com>,
	Jonathan Hunter <jonathanh@nvidia.com>,
	Christoph Hellwig <hch@infradead.org>,
	Kevin Tian <kevin.tian@intel.com>,
	Chaitanya Kulkarni <kch@nvidia.com>,
	Alex Williamson <alex.williamson@redhat.com>,
	kvm@vger.kernel.org, Bjorn Helgaas <bhelgaas@google.com>,
	Dan Williams <dan.j.williams@intel.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Cornelia Huck <cohuck@redhat.com>,
	linux-kernel@vger.kernel.org, Li Yang <leoyang.li@nxp.com>,
	iommu@lists.linux-foundation.org,
	Jacob jun Pan <jacob.jun.pan@intel.com>,
	Daniel Vetter <daniel@ffwll.ch>,
	Robin Murphy <robin.murphy@arm.com>
Subject: Re: [PATCH v1 6/8] gpu/host1x: Use iommu_attach/detach_device()
Date: Thu, 6 Jan 2022 11:35:43 -0400	[thread overview]
Message-ID: <20220106153543.GD2328285@nvidia.com> (raw)
In-Reply-To: <20220106022053.2406748-7-baolu.lu@linux.intel.com>

On Thu, Jan 06, 2022 at 10:20:51AM +0800, Lu Baolu wrote:
> Ordinary drivers should use iommu_attach/detach_device() for domain
> attaching and detaching.
> 
> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
>  drivers/gpu/host1x/dev.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/host1x/dev.c b/drivers/gpu/host1x/dev.c
> index fbb6447b8659..6e08cb6202cc 100644
> +++ b/drivers/gpu/host1x/dev.c
> @@ -265,7 +265,7 @@ static struct iommu_domain *host1x_iommu_attach(struct host1x *host)
>  			goto put_cache;
>  		}
>  
> -		err = iommu_attach_group(host->domain, host->group);
> +		err = iommu_attach_device(host->domain, host->dev);
>  		if (err) {
>  			if (err == -ENODEV)
>  				err = 0;
> @@ -335,7 +335,7 @@ static void host1x_iommu_exit(struct host1x *host)
>  {
>  	if (host->domain) {
>  		put_iova_domain(&host->iova);
> -		iommu_detach_group(host->domain, host->group);
> +		iommu_detach_device(host->domain, host->dev);
>  
>  		iommu_domain_free(host->domain);
>  		host->domain = NULL;

Shouldn't this add the flag to tegra_host1x_driver ?

And do like we did in the other tegra stuff and switch to the dma api
when !host1x_wants_iommu() ?

Jason
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