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Wed, 12 Feb 2025 21:34:21 +0000 (GMT) From: Matthew Rosato To: joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, gerald.schaefer@linux.ibm.com, schnelle@linux.ibm.com Cc: 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, jgg@nvidia.com, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Subject: [PATCH v5 2/4] s390/pci: store DMA offset in bus_dma_region Date: Wed, 12 Feb 2025 16:34:16 -0500 Message-ID: <20250212213418.182902-3-mjrosato@linux.ibm.com> X-Mailer: git-send-email 2.48.1 In-Reply-To: <20250212213418.182902-1-mjrosato@linux.ibm.com> References: <20250212213418.182902-1-mjrosato@linux.ibm.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-GUID: K5T5_4uNLo_nPJYvu_eeRl2jxD43pfgS X-Proofpoint-ORIG-GUID: K5T5_4uNLo_nPJYvu_eeRl2jxD43pfgS X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1057,Hydra:6.0.680,FMLib:17.12.68.34 definitions=2025-02-12_06,2025-02-11_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 malwarescore=0 mlxscore=0 lowpriorityscore=0 adultscore=0 bulkscore=0 priorityscore=1501 mlxlogscore=768 clxscore=1015 phishscore=0 impostorscore=0 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2501170000 definitions=main-2502120152 Content-Type: text/plain; charset="utf-8" PCI devices on s390 have a DMA offset that is reported via CLP. In preparation for allowing identity domains, setup the bus_dma_region for all PCI devices using the reported CLP value. Signed-off-by: Matthew Rosato Reviewed-by: Niklas Schnelle Tested-by: Niklas Schnelle --- arch/s390/pci/pci_bus.c | 25 +++++++++++++++++++++++++ 1 file changed, 25 insertions(+) diff --git a/arch/s390/pci/pci_bus.c b/arch/s390/pci/pci_bus.c index 857afbc4828f..3fa113c4ad8f 100644 --- a/arch/s390/pci/pci_bus.c +++ b/arch/s390/pci/pci_bus.c @@ -19,6 +19,7 @@ #include #include #include +#include =20 #include #include @@ -283,10 +284,34 @@ static struct zpci_bus *zpci_bus_alloc(int topo, bool= topo_is_tid) return zbus; } =20 +static void pci_dma_range_setup(struct pci_dev *pdev) +{ + struct zpci_dev *zdev =3D to_zpci(pdev); + struct bus_dma_region *map; + u64 aligned_end; + + map =3D kzalloc(sizeof(*map), GFP_KERNEL); + if (!map) + return; + + map->cpu_start =3D 0; + map->dma_start =3D PAGE_ALIGN(zdev->start_dma); + aligned_end =3D PAGE_ALIGN_DOWN(zdev->end_dma + 1); + if (aligned_end >=3D map->dma_start) + map->size =3D aligned_end - map->dma_start; + else + map->size =3D 0; + WARN_ON_ONCE(map->size =3D=3D 0); + + pdev->dev.dma_range_map =3D map; +} + void pcibios_bus_add_device(struct pci_dev *pdev) { struct zpci_dev *zdev =3D to_zpci(pdev); =20 + pci_dma_range_setup(pdev); + /* * With pdev->no_vf_scan the common PCI probing code does not * perform PF/VF linking. --=20 2.48.1