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<1a1c9b992a9a957e200d55b0a1330a0c3d75baa0.camel@linux.ibm.com> Subject: Re: [PATCH v2 2/3] s390/pci: store DMA offset in bus_dma_region From: Niklas Schnelle To: Matthew Rosato , joro@8bytes.org, will@kernel.org, robin.murphy@arm.com, gerald.schaefer@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, iommu@lists.linux.dev, linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org Date: Mon, 16 Dec 2024 10:29:56 +0100 In-Reply-To: <20241213224941.571060-3-mjrosato@linux.ibm.com> References: <20241213224941.571060-1-mjrosato@linux.ibm.com> <20241213224941.571060-3-mjrosato@linux.ibm.com> Autocrypt: addr=schnelle@linux.ibm.com; prefer-encrypt=mutual; keydata=mQINBGHm3M8BEAC+MIQkfoPIAKdjjk84OSQ8erd2OICj98+GdhMQpIjHXn/RJdCZLa58k /ay5x0xIHkWzx1JJOm4Lki7WEzRbYDexQEJP0xUia0U+4Yg7PJL4Dg/W4Ho28dRBROoJjgJSLSHwc 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UO2yxhPHgoW99OuZw3IRHe0+mNR67JbIpSuFWDFNjZ0nckQcU1taSEUi0euWs7i4MEkm0NsOsVhbs 4D2vMiC6kO/FqWOPmWZeAjyJw/KRUG4PaJAr5zJUx57nhKWgeTniW712n4DwCUh77D/PHY0nqBTG/ B+QQCR/FYGpTFkO4DRVfapT8njDrsWyVpP9o64VNZP42S+DuRGWfUKCMAXsM/wPzRiDEVfnZMcUR9 vwLSHeoV7MiIFC0xIrp5ES9R00t4UFgqtGc36DV71qjR+66Im0= Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.54.2 (3.54.2-1.fc41) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-ORIG-GUID: JHXACY7HyTDr-Mapzy3qTZZ1vZUXk_HX X-Proofpoint-GUID: JHXACY7HyTDr-Mapzy3qTZZ1vZUXk_HX 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 malwarescore=0 clxscore=1011 lowpriorityscore=0 impostorscore=0 spamscore=0 mlxscore=0 adultscore=0 mlxlogscore=999 suspectscore=0 bulkscore=0 phishscore=0 priorityscore=1501 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2412160079 On Fri, 2024-12-13 at 17:49 -0500, Matthew Rosato wrote: > 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. >=20 > Signed-off-by: Matthew Rosato > --- > arch/s390/pci/pci_bus.c | 18 ++++++++++++++++++ > 1 file changed, 18 insertions(+) >=20 > diff --git a/arch/s390/pci/pci_bus.c b/arch/s390/pci/pci_bus.c > index d5ace00d10f0..14527687d0f2 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 > @@ -284,10 +285,27 @@ static struct zpci_bus *zpci_bus_alloc(int topo, bo= ol 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; > + > + map =3D kzalloc(sizeof(*map), GFP_KERNEL); > + if (!map) > + return; > + > + map->cpu_start =3D 0; > + map->dma_start =3D PAGE_ALIGN(zdev->start_dma); > + map->size =3D (u64)virt_to_phys(high_memory); I don't think we should restrict the size here to the size of memory. Instead I think it should be zdev->end_dma - zdev->start_dma. Since we handle the restriction to memory size as reserved regions I think that should be compatible. Also I think otherwise this might break the admittedly odd s390_iommu_aperture=3DX kernel parameter on LPARs. > + 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.