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Tue, 10 Dec 2024 21:23:21 +0000 (GMT) Message-ID: <49deb7fa-a0a5-4ace-b3cc-1d07e0d273b4@linux.ibm.com> Date: Tue, 10 Dec 2024 16:23:20 -0500 Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/6] s390: enable ARCH_HAS_PHYS_TO_DMA To: Christoph Hellwig Cc: joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, gerald.schaefer@linux.ibm.com, schnelle@linux.ibm.com, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, svens@linux.ibm.com, borntraeger@linux.ibm.com, farman@linux.ibm.com, clegoate@redhat.com, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org References: <20241209192403.107090-1-mjrosato@linux.ibm.com> <20241209192403.107090-3-mjrosato@linux.ibm.com> Content-Language: en-US From: Matthew Rosato In-Reply-To: Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: yhnDXqh8mc7otoZXfW6WMDPFm7kLwqb9 X-Proofpoint-GUID: yhnDXqh8mc7otoZXfW6WMDPFm7kLwqb9 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1051,Hydra:6.0.680,FMLib:17.12.62.30 definitions=2024-10-15_01,2024-10-11_01,2024-09-30_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxlogscore=622 adultscore=0 lowpriorityscore=0 clxscore=1011 phishscore=0 impostorscore=0 suspectscore=0 spamscore=0 mlxscore=0 priorityscore=1501 malwarescore=0 bulkscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2412100152 On 12/9/24 11:33 PM, Christoph Hellwig wrote: > On Mon, Dec 09, 2024 at 02:23:59PM -0500, Matthew Rosato wrote: >> PCI devices on s390 have a DMA offset that is reported via CLP. In >> preparation for allowing identity domains, enable ARCH_HAS_PHYS_TO_DMA >> for s390 and get the dma offset for all PCI devices from the reported >> CLP value. > > Nothing new should select ARCH_HAS_PHYS_TO_DMA, please fill out the > bus_dma_region attached to the device instead. > OK, thanks for the pointer. I think I've got it converted, will test some more and include this change in next version.