linux-kernel - Re: [PATCH v7 04/12] iommu: Cleanup iopf data structure definitions

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Message-ID: <46f1e3dc-62f7-489e-9b7b-0398c32a279c@intel.com>
Date:   Mon, 4 Dec 2023 19:03:59 +0800
From:   Yi Liu <yi.l.liu@...el.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>,
        "Jean-Philippe Brucker" <jean-philippe@...aro.org>,
        Nicolin Chen <nicolinc@...dia.com>
CC:     Jacob Pan <jacob.jun.pan@...ux.intel.com>,
        Yan Zhao <yan.y.zhao@...el.com>, <iommu@...ts.linux.dev>,
        <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Jason Gunthorpe <jgg@...dia.com>
Subject: Re: [PATCH v7 04/12] iommu: Cleanup iopf data structure definitions

On 2023/11/15 11:02, Lu Baolu wrote:
> struct iommu_fault_page_request and struct iommu_page_response are not
> part of uAPI anymore. Convert them to data structures for kAPI.
> 
> Signed-off-by: Lu Baolu <baolu.lu@...ux.intel.com>
> Reviewed-by: Jason Gunthorpe <jgg@...dia.com>
> Reviewed-by: Kevin Tian <kevin.tian@...el.com>
> Tested-by: Yan Zhao <yan.y.zhao@...el.com>
> ---
>   include/linux/iommu.h      | 27 +++++++++++----------------
>   drivers/iommu/io-pgfault.c |  1 -
>   drivers/iommu/iommu.c      |  4 ----
>   3 files changed, 11 insertions(+), 21 deletions(-)

Reviewed-by: Yi Liu <yi.l.liu@...el.com>

> diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> index 81eee1afec72..79775859af42 100644
> --- a/include/linux/iommu.h
> +++ b/include/linux/iommu.h
> @@ -71,12 +71,12 @@ struct iommu_fault_page_request {
>   #define IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE	(1 << 1)
>   #define IOMMU_FAULT_PAGE_REQUEST_PRIV_DATA	(1 << 2)
>   #define IOMMU_FAULT_PAGE_RESPONSE_NEEDS_PASID	(1 << 3)
> -	__u32	flags;
> -	__u32	pasid;
> -	__u32	grpid;
> -	__u32	perm;
> -	__u64	addr;
> -	__u64	private_data[2];
> +	u32	flags;
> +	u32	pasid;
> +	u32	grpid;
> +	u32	perm;
> +	u64	addr;
> +	u64	private_data[2];
>   };
>   
>   /**
> @@ -85,7 +85,7 @@ struct iommu_fault_page_request {
>    * @prm: Page Request message, when @type is %IOMMU_FAULT_PAGE_REQ
>    */
>   struct iommu_fault {
> -	__u32	type;
> +	u32 type;
>   	struct iommu_fault_page_request prm;
>   };
>   
> @@ -106,8 +106,6 @@ enum iommu_page_response_code {
>   
>   /**
>    * struct iommu_page_response - Generic page response information
> - * @argsz: User filled size of this data
> - * @version: API version of this structure
>    * @flags: encodes whether the corresponding fields are valid
>    *         (IOMMU_FAULT_PAGE_RESPONSE_* values)
>    * @pasid: Process Address Space ID
> @@ -115,14 +113,11 @@ enum iommu_page_response_code {
>    * @code: response code from &enum iommu_page_response_code
>    */
>   struct iommu_page_response {
> -	__u32	argsz;
> -#define IOMMU_PAGE_RESP_VERSION_1	1
> -	__u32	version;
>   #define IOMMU_PAGE_RESP_PASID_VALID	(1 << 0)
> -	__u32	flags;
> -	__u32	pasid;
> -	__u32	grpid;
> -	__u32	code;
> +	u32	flags;
> +	u32	pasid;
> +	u32	grpid;
> +	u32	code;
>   };
>   
>   
> diff --git a/drivers/iommu/io-pgfault.c b/drivers/iommu/io-pgfault.c
> index e5b8b9110c13..24b5545352ae 100644
> --- a/drivers/iommu/io-pgfault.c
> +++ b/drivers/iommu/io-pgfault.c
> @@ -56,7 +56,6 @@ static int iopf_complete_group(struct device *dev, struct iopf_fault *iopf,
>   			       enum iommu_page_response_code status)
>   {
>   	struct iommu_page_response resp = {
> -		.version		= IOMMU_PAGE_RESP_VERSION_1,
>   		.pasid			= iopf->fault.prm.pasid,
>   		.grpid			= iopf->fault.prm.grpid,
>   		.code			= status,
> diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
> index f17a1113f3d6..f24513e2b025 100644
> --- a/drivers/iommu/iommu.c
> +++ b/drivers/iommu/iommu.c
> @@ -1465,10 +1465,6 @@ int iommu_page_response(struct device *dev,
>   	if (!param || !param->fault_param)
>   		return -EINVAL;
>   
> -	if (msg->version != IOMMU_PAGE_RESP_VERSION_1 ||
> -	    msg->flags & ~IOMMU_PAGE_RESP_PASID_VALID)
> -		return -EINVAL;
> -
>   	/* Only send response if there is a fault report pending */
>   	mutex_lock(&param->fault_param->lock);
>   	if (list_empty(&param->fault_param->faults)) {

-- 
Regards,
Yi Liu