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Tue, 03 Nov 2020 10:29:17 +0000 MIME-Version: 1.0 Date: Tue, 03 Nov 2020 10:29:17 +0000 From: Marc Zyngier To: Thomas Gleixner Subject: Re: Aw: Re: [PATCH] pci: mediatek: fix warning in msi.h In-Reply-To: <87o8ke7njb.fsf@nanos.tec.linutronix.de> References: <20201031140330.83768-1-linux@fw-web.de> <878sbm9icl.fsf@nanos.tec.linutronix.de> <87lfflti8q.wl-maz@kernel.org> <1604253261.22363.0.camel@mtkswgap22> <87k0v4u4uq.wl-maz@kernel.org> <87pn4w90hm.fsf@nanos.tec.linutronix.de> <87h7q791j8.fsf@nanos.tec.linutronix.de> <877dr38kt8.fsf@nanos.tec.linutronix.de> <901c5eb8bbaa3fe53ddc8f65917e48ef@kernel.org> <87o8ke7njb.fsf@nanos.tec.linutronix.de> User-Agent: Roundcube Webmail/1.4.9 Message-ID: <016e887822baeae42599b910aaa33218@kernel.org> X-Sender: maz@kernel.org X-SA-Exim-Connect-IP: 51.254.78.96 X-SA-Exim-Rcpt-To: tglx@linutronix.de, frank-w@public-files.de, ryder.lee@mediatek.com, linux-mediatek@lists.infradead.org, linux@fw-web.de, linux-kernel@vger.kernel.org, matthias.bgg@gmail.com, linux-pci@vger.kernel.org, bhelgaas@google.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201103_052923_297415_27C3AD9C X-CRM114-Status: GOOD ( 13.67 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Ryder Lee , Frank Wunderlich , linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org, Bjorn Helgaas , linux-mediatek@lists.infradead.org, Matthias Brugger , Frank Wunderlich Content-Transfer-Encoding: 7bit Content-Type: text/plain; charset="us-ascii"; Format="flowed" Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org On 2020-11-03 10:16, Thomas Gleixner wrote: > On Tue, Nov 03 2020 at 09:54, Marc Zyngier wrote: >> On 2020-11-02 22:18, Thomas Gleixner wrote: >>> On Mon, Nov 02 2020 at 17:16, Thomas Gleixner wrote: >>>> On Mon, Nov 02 2020 at 11:30, Marc Zyngier wrote: >>>>> --- a/drivers/pci/probe.c >>>>> +++ b/drivers/pci/probe.c >>>>> @@ -871,6 +871,8 @@ static void pci_set_bus_msi_domain(struct >>>>> pci_bus >>>>> *bus) >>>>> d = pci_host_bridge_msi_domain(b); >>>>> >>>>> dev_set_msi_domain(&bus->dev, d); >>>>> + if (!d) >>>>> + bus->bus_flags |= PCI_BUS_FLAGS_NO_MSI; >>>> >>>> Hrm, that might break legacy setups (no irqdomain support). I'd >>>> rather >>>> prefer to explicitly tell the pci core at host registration time. >>> >>> s/might break/ breaks / Just validated :) >> >> For my own edification, can you point me to the failing case? > > Any architecture which selects PCI_MSI_ARCH_FALLBACKS and does not have > irqdomain support runs into: > > if (!d) > bus->bus_flags |= PCI_BUS_FLAGS_NO_MSI; > > which in turn makes pci_msi_supported() return 0 and consequently makes > pci_enable_msi[x]() fail. I pointer that out in [1], together with a potential fix. Not sure if anything else breaks though. Thanks, M. [1] https://lore.kernel.org/r/336d6588567949029c52ecfbb87660c1@kernel.org/ -- Jazz is not dead. It just smells funny... _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek