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Wed, 25 Mar 2026 17:44:28 +0000 (GMT) Message-ID: <64a0373e-a20d-4890-b2f7-c6e2f9d279af@linux.ibm.com> Date: Wed, 25 Mar 2026 10:44:28 -0700 Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v11 2/9] s390/pci: Add architecture specific resource/bus address translation To: =?UTF-8?Q?Ilpo_J=C3=A4rvinen?= , Bjorn Helgaas Cc: linux-s390@vger.kernel.org, LKML , linux-pci@vger.kernel.org, Lukas Wunner , alex@shazbot.org, kbusch@kernel.org, clg@redhat.com, stable@vger.kernel.org, schnelle@linux.ibm.com, mjrosato@linux.ibm.com References: <20260324230641.GA1162880@bhelgaas> <328a79ef-7b73-582f-f36b-5139ff04e24d@linux.intel.com> Content-Language: en-US From: Farhan Ali In-Reply-To: <328a79ef-7b73-582f-f36b-5139ff04e24d@linux.intel.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: TlfwTHPCASCXXYzxyoSoW4oxqjy2u9B9 X-Proofpoint-ORIG-GUID: TlfwTHPCASCXXYzxyoSoW4oxqjy2u9B9 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwMzI1MDEyNSBTYWx0ZWRfXwkR086dKHMas 0LiDAUIGqMpKNdL5N5ZUeVEEt9VVoVHQsxQ3EX+J8DjiY8B3flRuT6/BGAkDcozt8pjOlVLtF6B TdaOfWFq1ma6y09hVWpmUhLazicdV5wFDAIH94pRQgUrBFJ6uyVV4qf6eql8506LsaBvhk7rjTl DngazpUEEdMEIs1YrQj9FK3VrLPD5765PmVT/r05nUjjrvAf4WbauNbLzIVjg2vT1G3sVYuQXV9 FxIJo29K8wAxMTMftDS9uFXT5iE6BzQqG4uCayNU8HPqA4hngQOzSt6nUVRunnRn0TvbTKHH0jM SanllJ3Nkxz7CGDqtdpRR4YuegNZ5ZmTYaqFc75Q0+XS9tYvM1BS/IMBhVicGwdq5x0KJ4rKs0r 2uog2PrApcjhyq5yd8Y05LgRYFj2FbKuMuB3aYns62sN/nnBc5rBDeQOYXdvhjFynN2eJIYvNBw bBkeWd5H3T97YIx0x3A== X-Authority-Analysis: v=2.4 cv=KbXfcAYD c=1 sm=1 tr=0 ts=69c41f00 cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=RzCfie-kr_QcCd8fBx8p:22 a=YtWjIhaGdMQ7bBwzLDoA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-25_05,2026-03-24_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 impostorscore=0 malwarescore=0 adultscore=0 clxscore=1015 priorityscore=1501 bulkscore=0 lowpriorityscore=0 phishscore=0 spamscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2603050001 definitions=main-2603250125 On 3/25/2026 4:58 AM, Ilpo Järvinen wrote: > On Tue, 24 Mar 2026, Bjorn Helgaas wrote: > >> [+cc Ilpo just for awareness; I assume there's nothing Linux can >> actually *do* with s390 PCI resources?] > I'm somewhat aware they've this speciality (and besides that, I'm > waiting for this change in order to proceed with the series to detect > which resources are properly setup when we enumerate them which got > reverted earlier). > > An additional thought related to this, there's IORESOURCE_PCI_FIXED > results in skipping most of the resource fitting and assignment code, so > if nothing really should touch these resources, perhaps that flag might be > of some help. I need to look into IORESOURCE_PCI_FIXED. Looking at briefly I think it may work for pci_restore_bars(), though need to check other callers of pcibios_resource_to_bus() to see if they will overwrite the BARs. But for now will remove this patch as part of this series and send it out as a separate patch. Thanks Farhan >