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Wed, 26 Jun 2024 11:20:51 GMT Received: from smtpav02.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 00D4758082; Wed, 26 Jun 2024 11:20:49 +0000 (GMT) Received: from smtpav02.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id A4E9658093; Wed, 26 Jun 2024 11:20:46 +0000 (GMT) Received: from [9.179.2.26] (unknown [9.179.2.26]) by smtpav02.dal12v.mail.ibm.com (Postfix) with ESMTP; Wed, 26 Jun 2024 11:20:46 +0000 (GMT) Message-ID: Subject: Re: [PATCH v4 2/4] s390/pci: Add quirk support and set pdev-non_compliant_bars for ISM devices From: Niklas Schnelle To: Bjorn Helgaas , Christoph Hellwig , Gerald Schaefer , Heiko Carstens , Vasily Gorbik , Alexander Gordeev , Christian Borntraeger , Sven Schnelle , Alex Williamson , Gerd Bayer , Matthew Rosato , Jason Gunthorpe Cc: linux-s390@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org Date: Wed, 26 Jun 2024 13:20:45 +0200 In-Reply-To: <20240626-vfio_pci_mmap-v4-2-7f038870f022@linux.ibm.com> References: <20240626-vfio_pci_mmap-v4-0-7f038870f022@linux.ibm.com> <20240626-vfio_pci_mmap-v4-2-7f038870f022@linux.ibm.com> Autocrypt: addr=schnelle@linux.ibm.com; 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charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.52.2 (3.52.2-1.fc40) 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-ORIG-GUID: P96uNEp4CflryVNo56zJFA_mjXNWdruA X-Proofpoint-GUID: oiz9z4CzFhgLlTcObjGprijPRj4uxIAO X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.28.16 definitions=2024-06-26_05,2024-06-25_01,2024-05-17_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 adultscore=0 suspectscore=0 lowpriorityscore=0 clxscore=1015 impostorscore=0 priorityscore=1501 bulkscore=0 malwarescore=0 phishscore=0 mlxlogscore=999 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2406140001 definitions=main-2406260082 On Wed, 2024-06-26 at 13:15 +0200, Niklas Schnelle wrote: > On s390 there is a virtual PCI device called ISM which has a few > pecularities. For one it claims to have a 256 TiB PCI BAR which leads to > any attempt to ioremap() in its entirety failing. This is problematic > since mapping the whole BAR is the default behavior of for example QEMU > with VFIO_PCI_MMAP enabled. >=20 > Even if one tried to map this BAR only partially the mapping would not > be usable on systems with MIO support enabled unless using the function > handle based PCI instructions directly. This is because of another > oddity in that this virtual PCI device does not support the newer memory > I/O (MIO) PCI instructions and legacy PCI instructions are not > accessible through writeq()/readq() or by user-space when MIO is in use. >=20 > Indicate that ISM's BAR is special and does not conform to PCI BAR > expectations by setting pdev->non_compliant_bars such that drivers not > specifically developed for ISM can easily ignore it. To this end add > basic PCI quirks support modeled after x86's arch/x86/pci/fixup.c and > move the ISM device's PCI ID to the common header to make it accessible. > Also enable CONFIG_PCI_QUIRKS whenever CONFIG_PCI is enabled. >=20 > Signed-off-by: Niklas Schnelle > --- >=20 Fixed the '-' instead of '->' typo in the patch subject locally. Chances are we get a v5 anyway. Thanks, Niklas