linux-kernel - Re: [PATCH v6 6/6] iommu/tegra-smmu: Add pagetable mappings to debugfs

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Message-ID: <20210914184933.GA32705@Asurada-Nvidia>
Date:   Tue, 14 Sep 2021 11:49:34 -0700
From:   Nicolin Chen <nicoleotsuka@...il.com>
To:     Dmitry Osipenko <digetx@...il.com>
Cc:     thierry.reding@...il.com, joro@...tes.org, will@...nel.org,
        vdumpa@...dia.com, jonathanh@...dia.com,
        linux-tegra@...r.kernel.org, iommu@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v6 6/6] iommu/tegra-smmu: Add pagetable mappings to
 debugfs

On Tue, Sep 14, 2021 at 04:29:15PM +0300, Dmitry Osipenko wrote:
> 14.09.2021 04:38, Nicolin Chen пишет:
> > +static unsigned long pd_pt_index_iova(unsigned int pd_index, unsigned int pt_index)
> > +{
> > +	return ((dma_addr_t)pd_index & (SMMU_NUM_PDE - 1)) << SMMU_PDE_SHIFT |
> > +	       ((dma_addr_t)pt_index & (SMMU_NUM_PTE - 1)) << SMMU_PTE_SHIFT;
> > +}
> 
> We know that IOVA is fixed to u32 for this controller. Can we avoid all
> these dma_addr_t castings? It should make code cleaner a tad, IMO.

Tegra210 actually supports 34-bit IOVA...