linux-kernel - Re: [PATCH v2 09/12] iommu: Move iopf

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Date:   Thu, 10 Aug 2023 16:02:43 -0300
From:   Jason Gunthorpe <jgg@...pe.ca>
To:     Lu Baolu <baolu.lu@...ux.intel.com>
Cc:     Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Kevin Tian <kevin.tian@...el.com>,
        Jean-Philippe Brucker <jean-philippe@...aro.org>,
        Nicolin Chen <nicolinc@...dia.com>,
        Yi Liu <yi.l.liu@...el.com>,
        Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        iommu@...ts.linux.dev, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 09/12] iommu: Move iopf_handler() to iommu-sva.c

On Thu, Jul 27, 2023 at 01:48:34PM +0800, Lu Baolu wrote:
> The iopf_handler() function handles a fault_group for a SVA domain. Move
> it to the right place.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> ---
>  drivers/iommu/iommu-sva.h  | 17 +++++++++++++
>  drivers/iommu/io-pgfault.c | 50 +++-----------------------------------
>  drivers/iommu/iommu-sva.c  | 49 +++++++++++++++++++++++++++++++++++++
>  3 files changed, 69 insertions(+), 47 deletions(-)
> diff --git a/drivers/iommu/iommu-sva.c b/drivers/iommu/iommu-sva.c
> index 05c0fb2acbc4..ab42cfdd7636 100644
> --- a/drivers/iommu/iommu-sva.c
> +++ b/drivers/iommu/iommu-sva.c
> @@ -219,3 +219,52 @@ void mm_pasid_drop(struct mm_struct *mm)

> +static void iopf_handler(struct work_struct *work)
> +{
> +	struct iopf_fault *iopf;
> +	struct iopf_group *group;
> +	struct iommu_domain *domain;
> +	enum iommu_page_response_code status = IOMMU_PAGE_RESP_SUCCESS;
> +
> +	group = container_of(work, struct iopf_group, work);
> +	domain = iommu_get_domain_for_dev_pasid(group->dev,
> +				group->last_fault.fault.prm.pasid, 0);
> +	if (!domain || !domain->iopf_handler)
> +		status = IOMMU_PAGE_RESP_INVALID;
> +
> +	list_for_each_entry(iopf, &group->faults, list) {
> +		/*
> +		 * For the moment, errors are sticky: don't handle subsequent
> +		 * faults in the group if there is an error.
> +		 */
> +		if (status == IOMMU_PAGE_RESP_SUCCESS)
> +			status = domain->iopf_handler(&iopf->fault,
> +						      domain->fault_data);
> +	}
> +
> +	iopf_complete_group(group->dev, &group->last_fault, status);
> +	iopf_free_group(group);
> +}

Routing faults to domains is generic code, not SVA code.

SVA starts at domain->iopf_handler

Jason