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From:   Michael Ellerman <patch-notifications@ellerman.id.au>
To:     Leonardo Bras <leobras.c@gmail.com>,
        Murilo Fossa Vicentini <muvic@linux.ibm.com>,
        Michael Ellerman <mpe@ellerman.id.au>,
        Alexey Kardashevskiy <aik@ozlabs.ru>,
        David Dai <zdai@linux.vnet.ibm.com>,
        Ram Pai <linuxram@us.ibm.com>,
        Thiago Jung Bauermann <bauerman@linux.ibm.com>,
        Paul Mackerras <paulus@samba.org>,
        Benjamin Herrenschmidt <benh@kernel.crashing.org>,
        Brian King <brking@linux.vnet.ibm.com>
Cc:     linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org
In-Reply-To: <20200805030455.123024-1-leobras.c@gmail.com>
References: <20200805030455.123024-1-leobras.c@gmail.com>
Subject: Re: [PATCH v5 0/4] Allow bigger 64bit window by removing default DMA window
Message-Id: <159965717483.808686.14535897310310541742.b4-ty@ellerman.id.au>
Date:   Wed,  9 Sep 2020 23:27:53 +1000 (AEST)
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

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