linux-kernel - RE: [PATCH] iommu/io-pgtable-arm: Optimize partial walk flush for large scatter-gather list

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Date:   Thu, 17 Jun 2021 21:18:34 +0000
From:   Krishna Reddy <vdumpa@...dia.com>
To:     Sai Prakash Ranjan <saiprakash.ranjan@...eaurora.org>,
        Robin Murphy <robin.murphy@....com>
CC:     "linux-arm-msm@...r.kernel.org" <linux-arm-msm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        Will Deacon <will@...nel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        Thierry Reding <treding@...dia.com>
Subject: RE: [PATCH] iommu/io-pgtable-arm: Optimize partial walk flush for
 large scatter-gather list

> Instead of flush_ops in init_context hook, perhaps a io_pgtable quirk since this is
> related to tlb, probably a bad name but IO_PGTABLE_QUIRK_TLB_INV which will
> be set in init_context impl hook and the prev condition in
> io_pgtable_tlb_flush_walk()
> becomes something like below. Seems very minimal and neat instead of poking
> into tlb_flush_walk functions or touching dma strict with some flag?
> 
> if (iop->cfg.quirks & IO_PGTABLE_QUIRK_NON_STRICT ||
>      iop->cfg.quirks & IO_PGTABLE_QUIRK_TLB_INV) {
>          iop->cfg.tlb->tlb_flush_all(iop->cookie);
>          return;
> }

Can you name it as IO_PGTABLE_QUIRK_TLB_INV_ASID or IO_PGTABLE_QUIRK_TLB_INV_ALL_ASID?

-KR