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Thu, 14 Aug 2025 08:32:05 GMT Received: from smtpav06.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 34A4B58059; Thu, 14 Aug 2025 08:32:05 +0000 (GMT) Received: from smtpav06.dal12v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id DFA0858043; Thu, 14 Aug 2025 08:32:02 +0000 (GMT) Received: from [9.87.142.31] (unknown [9.87.142.31]) by smtpav06.dal12v.mail.ibm.com (Postfix) with ESMTP; Thu, 14 Aug 2025 08:32:02 +0000 (GMT) Message-ID: <39e654cfcce848d57671cbd5d7038f2f9667789a.camel@linux.ibm.com> Subject: Re: [PATCH v15 0/6] Refactor capability search into common macros From: Niklas Schnelle To: Hans Zhang <18255117159@163.com>, lpieralisi@kernel.org, kwilczynski@kernel.org, bhelgaas@google.com, helgaas@kernel.org, jingoohan1@gmail.com, mani@kernel.org Cc: robh@kernel.org, ilpo.jarvinen@linux.intel.com, gbayer@linux.ibm.com, lukas@wunner.de, arnd@kernel.org, geert@linux-m68k.org, linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org Date: Thu, 14 Aug 2025 10:32:02 +0200 In-Reply-To: <20250813144529.303548-1-18255117159@163.com> References: <20250813144529.303548-1-18255117159@163.com> Autocrypt: addr=schnelle@linux.ibm.com; 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charset="UTF-8" Content-Transfer-Encoding: quoted-printable User-Agent: Evolution 3.56.2 (3.56.2-1.fc42) 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-Authority-Analysis: v=2.4 cv=KPRaDEFo c=1 sm=1 tr=0 ts=689d9f07 cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=IkcTkHD0fZMA:10 a=2OwXVqhp2XgA:10 a=VnNF1IyMAAAA:8 a=6-NR3gJOg-QBa0eNMoMA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-ORIG-GUID: -9T7J2Gs3QLAbUG_NUwHiEVw65rCSzfq X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwODEyMDIyNCBTYWx0ZWRfX5aT9NtrjkObK D2Fybx+iw5qyoUdqlcOW1f5WC4dfgFzYXRXoT0XUErQAZBJBmsFWBr4KeOm7JimQHmoHKR8e/OY YQnVO+keO5TwlkJG9Dd1ockZ5GiVH8de3JR6RVu7eIgrmto9r6LnFD9zSrCz/NkNnLSJFMSqyoh qT1M3aWTFuCWAyKVWdCIXj6W7xpHEfZHiou5L6fHmHx64qxGDZ2dSxvMaBiMF60stkXWXNo6LhM hi3/ohMVvjwv1gr8949kM3zqf4hPCeHOBi2Si+R+Mmk42MMSVgBfwaUt3LznKFTM9RfiaMOGuVi ibhoVG3NoTQMYeVKMX1Z76CQb7LDzy/dTGY7/vXD+m03f9Y4ltE2wxG3wmYHpMwtiADo96rExOv luAIN4w0 X-Proofpoint-GUID: 0vTMROrnefqM3TzT0uBd6jihuVkLb6g3 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-08-13_02,2025-08-11_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 phishscore=0 impostorscore=0 bulkscore=0 adultscore=0 priorityscore=1501 malwarescore=0 spamscore=0 clxscore=1015 suspectscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2507300000 definitions=main-2508120224 On Wed, 2025-08-13 at 22:45 +0800, Hans Zhang wrote: > Dear Maintainers, >=20 > This patch series addresses long-standing code duplication in PCI > capability discovery logic across the PCI core and controller drivers. > The existing implementation ties capability search to fully initialized > PCI device structures, limiting its usability during early controller > initialization phases where device/bus structures may not yet be > available. >=20 > The primary goal is to decouple capability discovery from PCI device > dependencies by introducing a unified framework using config space > accessor-based macros. This enables: >=20 > 1. Early Capability Discovery: Host controllers (e.g., Cadence, DWC) > can now perform capability searches during pre-initialization stages > using their native config accessors. >=20 > 2. Code Consolidation: Common logic for standard and extended capability > searches is refactored into shared macros (`PCI_FIND_NEXT_CAP` and > `PCI_FIND_NEXT_EXT_CAP`), eliminating redundant implementations. >=20 > 3. Safety and Maintainability: TTL checks are centralized within the > macros to prevent infinite loops, while hardcoded offsets in drivers > are replaced with dynamic discovery, reducing fragility. >=20 > Key improvements include: =20 > - Driver Conversions: DesignWare and Cadence drivers are migrated to > use the new macros, removing device-specific assumptions and ensuring > consistent error handling. >=20 > - Enhanced Readability: Magic numbers are replaced with symbolic > constants, and config space accessors are standardized for clarity. >=20 > - Backward Compatibility: Existing PCI core behavior remains unchanged. >=20 > --- > Dear Niklas and Gerd, >=20 > Can you test this series of patches on the s390? >=20 > Thank you very much. Hi Hans, I gave this series a try on top of v6.17-rc1 on s390 and a bunch of PCI devices including the mlx5 cards that Gerd we originally saw issues with. All looks well now. So feel free to add as appropriate: Tested-by: Niklas Schnelle Thanks, Niklas