linux-kernel - Re: [RFC PATCH v2 2/2] iommu/amd: Add support for fast IOTLB flushing

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Message-ID: <2783078a-1cf6-58da-35a7-98f91afabcc4@amd.com>
Date:   Wed, 24 Jan 2018 18:43:18 +0700
From:   Suravee Suthikulpanit <suravee.suthikulpanit@....com>
To:     linux-kernel@...r.kernel.org, iommu@...ts.linux-foundation.org
Cc:     joro@...tes.org, jroedel@...e.de, alex.williamson@...hat.com
Subject: Re: [RFC PATCH v2 2/2] iommu/amd: Add support for fast IOTLB flushing

Hi Joerg,

On 12/27/17 4:20 PM, Suravee Suthikulpanit wrote:
> Implement the newly added IOTLB flushing interface for AMD IOMMU.
> 
> Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
> ---
>   drivers/iommu/amd_iommu.c       | 73 ++++++++++++++++++++++++++++++++++++++++-
>   drivers/iommu/amd_iommu_init.c  |  7 ++++
>   drivers/iommu/amd_iommu_types.h |  7 ++++
>   3 files changed, 86 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/iommu/amd_iommu.c b/drivers/iommu/amd_iommu.c
> index 7d5eb00..42fe365 100644
> --- a/drivers/iommu/amd_iommu.c
> +++ b/drivers/iommu/amd_iommu.c
>  ...
> @@ -3163,6 +3168,69 @@ static bool amd_iommu_is_attach_deferred(struct iommu_domain *domain,
>   	return dev_data->defer_attach;
>   }
>   
> +static void amd_iommu_flush_iotlb_all(struct iommu_domain *domain)
> +{
> +	struct protection_domain *dom = to_pdomain(domain);
> +
> +	domain_flush_tlb_pde(dom);
> +}

I made a mistake here ...

> ...
> +static void amd_iommu_iotlb_sync(struct iommu_domain *domain)
> +{
> +	struct protection_domain *pdom = to_pdomain(domain);
> +	struct amd_iommu_flush_entries *entry, *next;
> +	unsigned long flags;
> +
> +	/* Note:
> +	 * Currently, IOMMU driver just flushes the whole IO/TLB for
> +	 * a given domain. So, just remove entries from the list here.
> +	 */
> +	spin_lock_irqsave(&amd_iommu_flush_list_lock, flags);
> +	list_for_each_entry_safe(entry, next, &amd_iommu_flush_list, list) {
> +		list_del(&entry->list);
> +		kfree(entry);
> +	}
> +	spin_unlock_irqrestore(&amd_iommu_flush_list_lock, flags);
> +
> +	domain_flush_tlb_pde(pdom);
> +}

... and here where I should also call domain_flush_complete() after
domain_flush_tlb_pde(). I'll send out a new version (v3) as a separate patch
from the series.

Thanks,
Suravee