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Sat, 6 Sep 2025 11:49:03 GMT Received: from smtpav06.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 5008458055; Sat, 6 Sep 2025 11:49:03 +0000 (GMT) Received: from smtpav06.wdc07v.mail.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id CA6A25804E; Sat, 6 Sep 2025 11:48:59 +0000 (GMT) Received: from [9.43.107.45] (unknown [9.43.107.45]) by smtpav06.wdc07v.mail.ibm.com (Postfix) with ESMTP; Sat, 6 Sep 2025 11:48:59 +0000 (GMT) Message-ID: <88359a18-7b82-41b5-b000-d4df837efd23@linux.ibm.com> Date: Sat, 6 Sep 2025 17:18:57 +0530 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 0/3] powerpc: Cleanup and convert to MSI parent domain To: Thomas Gleixner , Nam Cao , Michael Ellerman , Nicholas Piggin , Christophe Leroy , Marc Zyngier , Gautam Menghani , linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org References: <87y0qvy6hb.ffs@tglx> Content-Language: en-US From: Madhavan Srinivasan In-Reply-To: <87y0qvy6hb.ffs@tglx> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-TM-AS-GCONF: 00 X-Proofpoint-GUID: 4Kh3TUHBmB-yM0LSrAVxQtD1dCxCpaJj X-Proofpoint-ORIG-GUID: B4TI_8vZxenGmBxhhLh2rVLrsgQUjp9i X-Authority-Analysis: v=2.4 cv=J52q7BnS c=1 sm=1 tr=0 ts=68bc1fb1 cx=c_pps a=GFwsV6G8L6GxiO2Y/PsHdQ==:117 a=GFwsV6G8L6GxiO2Y/PsHdQ==:17 a=IkcTkHD0fZMA:10 a=yJojWOMRYYMA:10 a=VwQbUJbxAAAA:8 a=8RBs8q9EwLlXG4qsgXIA:9 a=QEXdDO2ut3YA:10 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwOTA2MDAyNSBTYWx0ZWRfX4WYIcpfPAHl6 LFImDKnYLisqUBc4ugz0KFRtevC/jhdaUPLDIcqlJ8i4k/DXrqhpqah5XTMkZIplHi/oAJGtsv4 RWml+Igi1wmuC2DDr3GlPMsonIPdXleUQpED5mNOJK93BLbbJu9quMitoe7OOQt0e/TN4k/fOGk L7llbBAMSggAbAjn13e8UnXxQc8tsewrgb+bAHMenkaRpCivObWpo7B+9kIj3oYfr1kZJrHM3fF h9ygRw/+l3YfMrB3HNN/6W2wro4pkm6DL9KkXuOF3kyZZKR5nYf7Nrf70vTXZQF2R/n07xlJdiT Ti/m42HNGdDDnbJhvMvYhb9aylL6EkMsKlRSiI98XhRZ0ldytEx1766kDtawnRXJbs424k6uqbe 0ybctWtl X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1117,Hydra:6.1.9,FMLib:17.12.80.40 definitions=2025-09-06_03,2025-09-04_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 impostorscore=0 clxscore=1011 suspectscore=0 spamscore=0 phishscore=0 bulkscore=0 adultscore=0 malwarescore=0 priorityscore=1501 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2507300000 definitions=main-2509060025 On 9/3/25 7:37 PM, Thomas Gleixner wrote: > On Mon, Aug 11 2025 at 11:28, Nam Cao wrote: > >> The initial implementation of PCI/MSI interrupt domains in the hierarchical >> interrupt domain model used a shortcut by providing a global PCI/MSI >> domain. >> >> This works because the PCI/MSI[X] hardware is standardized and uniform, but >> it violates the basic design principle of hierarchical interrupt domains: >> Each hardware block involved in the interrupt delivery chain should have a >> separate interrupt domain. >> >> For PCI/MSI[X], the interrupt controller is per PCI device and not a global >> made-up entity. >> >> Unsurprisingly, the shortcut turned out to have downsides as it does not >> allow dynamic allocation of interrupt vectors after initialization and it >> prevents supporting IMS on PCI. For further details, see: >> >> https://lore.kernel.org/lkml/20221111120501.026511281@linutronix.de/ >> >> The solution is implementing per device MSI domains, this means the >> entities which provide global PCI/MSI domain so far have to implement MSI >> parent domain functionality instead. >> >> This series: >> >> - Untangle XIVE driver from Powernv and Pseries drivers >> >> - Convert the Powernv and Pseries drivers to implement MSI parent domain >> functionality > > Polite reminder to the PPC folks. Can we please get this moving so we > can finally cleanup the pci_msi_create_irq_domain() leftovers? Yes, sorry for the delay, Will add this to my next after the test Maddy > > Thanks, > > tglx