linux-kernel - Re: [PATCH v4 07/13] iommu/arm-smmu-v3: Keep track of attached ssids

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Message-ID: <ZK9cyDaFkAKc1SvJ@Asurada-Nvidia>
Date:   Wed, 12 Jul 2023 19:09:12 -0700
From:   Nicolin Chen <nicolinc@...dia.com>
To:     Michael Shavit <mshavit@...gle.com>
CC:     Will Deacon <will@...nel.org>, Robin Murphy <robin.murphy@....com>,
        "Joerg Roedel" <joro@...tes.org>, <jean-philippe@...aro.org>,
        <jgg@...dia.com>, <baolu.lu@...ux.intel.com>,
        <linux-arm-kernel@...ts.infradead.org>, <iommu@...ts.linux.dev>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 07/13] iommu/arm-smmu-v3: Keep track of attached ssids

On Wed, Jun 21, 2023 at 02:37:19PM +0800, Michael Shavit wrote:
 
> +/* List of {masters, ssid} that a domain is attached to */
> +struct arm_smmu_attached_domain {
> +       struct list_head        domain_head;
> +       struct arm_smmu_domain  *domain;
> +       struct arm_smmu_master  *master;
> +       int                     ssid;
> +};
> +
>  /* SMMU private data for each master */
>  struct arm_smmu_master {
>         struct arm_smmu_device          *smmu;
>         struct device                   *dev;
> -       struct arm_smmu_domain          *domain;
> +       struct arm_smmu_attached_domain non_pasid_domain;
>         struct list_head                domain_head;
>         struct arm_smmu_stream          *streams;
>         struct arm_smmu_s1_cfg          owned_s1_cfg;
> @@ -724,8 +732,8 @@ struct arm_smmu_domain {
> 
>         struct iommu_domain                     domain;
> 
> -       struct list_head                        devices;
> -       spinlock_t                              devices_lock;
> +       struct list_head                        attached_domains;
> +       spinlock_t                              attached_domains_lock;

Yea, I think that this arm_smmu_attached_domain is similar to
the "subdomain" that I was talking about in the previous reply,
though having a list of attached domains under a domain doesn't
feel very clear.

Perhaps it would be good to have some renaming and kdoc too.

And since we have a group of subdomains that are simply indexed
by ssids, perhaps we can add an xarray to store a subdomain ptr
along with an ssid, replacing the list?

Thanks
Nicolin