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<62069e893ea338c17283b6c81b108f89d4ab2d77.camel@linux.ibm.com> Subject: Re: [PATCH v3 1/3] s390/pci: check for relaxed translation capability 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: Wed, 29 Jan 2025 11:07:46 +0100 In-Reply-To: <20250124201717.348736-2-mjrosato@linux.ibm.com> References: <20250124201717.348736-1-mjrosato@linux.ibm.com> <20250124201717.348736-2-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 3.54.3 (3.54.3-1.fc41) Precedence: bulk X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 0QHzY146MOcbErV0abwRYByxHMg6hRQf X-Proofpoint-ORIG-GUID: 0QHzY146MOcbErV0abwRYByxHMg6hRQf 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=2025-01-28_04,2025-01-27_01,2024-11-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 lowpriorityscore=0 bulkscore=0 phishscore=0 mlxlogscore=854 spamscore=0 priorityscore=1501 suspectscore=0 clxscore=1015 mlxscore=0 impostorscore=0 malwarescore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2411120000 definitions=main-2501290081 On Fri, 2025-01-24 at 15:17 -0500, Matthew Rosato wrote: > For each zdev, record whether or not CLP indicates relaxed translation > capability for the associated device group. >=20 > Signed-off-by: Matthew Rosato > --- > arch/s390/include/asm/pci.h | 2 +- > arch/s390/include/asm/pci_clp.h | 4 +++- > arch/s390/pci/pci_clp.c | 1 + > 3 files changed, 5 insertions(+), 2 deletions(-) >=20 > diff --git a/arch/s390/include/asm/pci.h b/arch/s390/include/asm/pci.h > index 474e1f8d1d3c..8fe4c7a72c0b 100644 > --- a/arch/s390/include/asm/pci.h > +++ b/arch/s390/include/asm/pci.h > @@ -144,7 +144,7 @@ struct zpci_dev { > u8 util_str_avail : 1; > u8 irqs_registered : 1; > u8 tid_avail : 1; > - u8 reserved : 1; > + u8 rtr_avail : 1; /* Relaxed translation allowed */ > unsigned int devfn; /* DEVFN part of the RID*/ > =20 > u8 pfip[CLP_PFIP_NR_SEGMENTS]; /* pci function internal path */ > diff --git a/arch/s390/include/asm/pci_clp.h b/arch/s390/include/asm/pci_= clp.h > index 3fff2f7095c8..7ebff39c84b3 100644 > --- a/arch/s390/include/asm/pci_clp.h > +++ b/arch/s390/include/asm/pci_clp.h > @@ -156,7 +156,9 @@ struct clp_rsp_query_pci_grp { > u16 : 4; > u16 noi : 12; /* number of interrupts */ > u8 version; > - u8 : 6; > + u8 : 2; > + u8 rtr : 1; /* Relaxed translation requirement */ > + u8 : 3; > u8 frame : 1; > u8 refresh : 1; /* TLB refresh mode */ > u16 : 3; > diff --git a/arch/s390/pci/pci_clp.c b/arch/s390/pci/pci_clp.c > index 14bf7e8d06b7..27248686e588 100644 > --- a/arch/s390/pci/pci_clp.c > +++ b/arch/s390/pci/pci_clp.c > @@ -112,6 +112,7 @@ static void clp_store_query_pci_fngrp(struct zpci_dev= *zdev, > zdev->version =3D response->version; > zdev->maxstbl =3D response->maxstbl; > zdev->dtsm =3D response->dtsm; > + zdev->rtr_avail =3D response->rtr; > =20 > switch (response->version) { > case 1: Checked the bit positions and as discussed out of band I gave the whole series a try too. So feel free to add: Reviewed-by: Niklas Schnelle Tested-by: Niklas Schnelle