linux-kernel - Re: [PATCH v6 00/11] DDW + Indirect Mapping

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Date:   Tue, 31 Aug 2021 23:56:58 +1000
From:   Michael Ellerman <patch-notifications@...erman.id.au>
To:     Alexey Kardashevskiy <aik@...abs.ru>,
        Nicolin Chen <nicoleotsuka@...il.com>,
        David Gibson <david@...son.dropbear.id.au>,
        Leonardo Bras <leobras.c@...il.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        kernel test robot <lkp@...el.com>,
        Frederic Barrat <fbarrat@...ux.ibm.com>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org
Subject: Re: [PATCH v6 00/11] DDW + Indirect Mapping

On Tue, 17 Aug 2021 03:39:18 -0300, Leonardo Bras wrote:
> So far it's assumed possible to map the guest RAM 1:1 to the bus, which
> works with a small number of devices. SRIOV changes it as the user can
> configure hundreds VFs and since phyp preallocates TCEs and does not
> allow IOMMU pages bigger than 64K, it has to limit the number of TCEs
> per a PE to limit waste of physical pages.
> 
> As of today, if the assumed direct mapping is not possible, DDW creation
> is skipped and the default DMA window "ibm,dma-window" is used instead.
> 
> [...]

Applied to powerpc/next.

[01/11] powerpc/pseries/iommu: Replace hard-coded page shift
        https://git.kernel.org/powerpc/c/0c634bafe3bbee7a36dca7f1277057e05bf14d91
[02/11] powerpc/kernel/iommu: Add new iommu_table_in_use() helper
        https://git.kernel.org/powerpc/c/3c33066a21903076722a2881556a92aa3cd7d359
[03/11] powerpc/pseries/iommu: Add iommu_pseries_alloc_table() helper
        https://git.kernel.org/powerpc/c/4ff8677a0b192a58d998d1d34fc5168203041a24
[04/11] powerpc/pseries/iommu: Add ddw_list_new_entry() helper
        https://git.kernel.org/powerpc/c/92a23219299cedde52e3298788484f4875d5ce0f
[05/11] powerpc/pseries/iommu: Allow DDW windows starting at 0x00
        https://git.kernel.org/powerpc/c/2ca73c54ce24489518a56d816331b774044c2445
[06/11] powerpc/pseries/iommu: Add ddw_property_create() and refactor enable_ddw()
        https://git.kernel.org/powerpc/c/7ed2ed2db2685a285cb09ab330dc4efea0b64022
[07/11] powerpc/pseries/iommu: Reorganize iommu_table_setparms*() with new helper
        https://git.kernel.org/powerpc/c/fc8cba8f989fb98e496b33a78476861e246c42a0
[08/11] powerpc/pseries/iommu: Update remove_dma_window() to accept property name
        https://git.kernel.org/powerpc/c/a5fd95120c653962a9e75e260a35436b96d2c991
[09/11] powerpc/pseries/iommu: Find existing DDW with given property name
        https://git.kernel.org/powerpc/c/8599395d34f2dd7b77bef42da1d99798e7a3d58f
[10/11] powerpc/pseries/iommu: Make use of DDW for indirect mapping
        https://git.kernel.org/powerpc/c/381ceda88c4c4c8345cad1cffa6328892f15dca6
[11/11] powerpc/pseries/iommu: Rename "direct window" to "dma window"
        https://git.kernel.org/powerpc/c/57dbbe590f152e5e8a3ff8bf5ba163df34eeae0b

cheers