linux-kernel - Re: [PATCH 01/11] RISC-V: drivers/iommu: Add RISC-V IOMMU

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Message-ID: <45d32e95-9d57-a424-63bd-b894cf0d3a2b@linux.intel.com>
Date:   Thu, 20 Jul 2023 20:31:19 +0800
From:   Baolu Lu <baolu.lu@...ux.intel.com>
To:     Tomasz Jeznach <tjeznach@...osinc.com>,
        Joerg Roedel <joro@...tes.org>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Paul Walmsley <paul.walmsley@...ive.com>
Cc:     baolu.lu@...ux.intel.com, Palmer Dabbelt <palmer@...belt.com>,
        Albert Ou <aou@...s.berkeley.edu>,
        Anup Patel <apatel@...tanamicro.com>,
        Sunil V L <sunilvl@...tanamicro.com>,
        Nick Kossifidis <mick@....forth.gr>,
        Sebastien Boeuf <seb@...osinc.com>, iommu@...ts.linux.dev,
        linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux@...osinc.com
Subject: Re: [PATCH 01/11] RISC-V: drivers/iommu: Add RISC-V IOMMU - Ziommu
 support.

On 2023/7/20 3:33, Tomasz Jeznach wrote:
> +static void riscv_iommu_iotlb_sync_map(struct iommu_domain *iommu_domain,
> +				       unsigned long iova, size_t size)
> +{
> +	unsigned long end = iova + size - 1;
> +	/*
> +	 * Given we don't know the page size used by this range, we assume the
> +	 * smallest page size to ensure all possible entries are flushed from
> +	 * the IOATC.
> +	 */
> +	size_t pgsize = PAGE_SIZE;
> +	riscv_iommu_flush_iotlb_range(iommu_domain, &iova, &end, &pgsize);
> +}

Does RISC-V IOMMU require to invalidate the TLB cache after new mappings
are created?

Best regards,
baolu