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Date: Wed, 9 Sep 2020 23:27:53 +1000 (AEST) From: Michael Ellerman <patch-notifications@...erman.id.au> To: Leonardo Bras <leobras.c@...il.com>, Murilo Fossa Vicentini <muvic@...ux.ibm.com>, Michael Ellerman <mpe@...erman.id.au>, Alexey Kardashevskiy <aik@...abs.ru>, David Dai <zdai@...ux.vnet.ibm.com>, Ram Pai <linuxram@...ibm.com>, Thiago Jung Bauermann <bauerman@...ux.ibm.com>, Paul Mackerras <paulus@...ba.org>, Benjamin Herrenschmidt <benh@...nel.crashing.org>, Brian King <brking@...ux.vnet.ibm.com> Cc: linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org Subject: Re: [PATCH v5 0/4] Allow bigger 64bit window by removing default DMA window On Wed, 5 Aug 2020 00:04:51 -0300, Leonardo Bras wrote: > There are some devices in which a hypervisor may only allow 1 DMA window > to exist at a time, and in those cases, a DDW is never created to them, > since the default DMA window keeps using this resource. > > LoPAR recommends this procedure: > 1. Remove the default DMA window, > 2. Query for which configs the DDW can be created, > 3. Create a DDW. > > [...] Applied to powerpc/next. [1/4] powerpc/pseries/iommu: Create defines for operations in ibm, ddw-applicable https://git.kernel.org/powerpc/c/cac3e629086f1b2e31c87a6c9b0130d29843ae86 [2/4] powerpc/pseries/iommu: Update call to ibm, query-pe-dma-windows https://git.kernel.org/powerpc/c/80f0251231131d164eddab78d2b6c1b8e37d0093 [3/4] powerpc/pseries/iommu: Move window-removing part of remove_ddw into remove_dma_window https://git.kernel.org/powerpc/c/74d0b3994e147a2b503170b5e02f1d07dc086586 [4/4] powerpc/pseries/iommu: Allow bigger 64bit window by removing default DMA window https://git.kernel.org/powerpc/c/8c0d51592f6f0123953633d1ecf21e843fce0bfd cheers
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