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Miller" , Geert Uytterhoeven , linux-m68k@lists.linux-m68k.org, linux-mips@vger.kernel.org, linux-pci@vger.kernel.org, sparclinux@vger.kernel.org, Thomas Bogendoerfer , =?ISO-8859-15?Q?Christian_K=F6nig?= , Yinghai Lu , Igor Mammedov , "Rafael J . Wysocki" , Jonathan Cameron , Lorenzo Pieralisi , =?ISO-8859-2?Q?Krzysztof_Wilczy=F1ski?= , LKML , =?ISO-8859-2?Q?Micha=B3_Winiarski?= , linuxppc-dev@lists.ozlabs.org Subject: Re: [PATCH 02/24] sparc/PCI: Remove pcibios_enable_device() as they do nothing extra In-Reply-To: <8fcc0fd4b74f99d5c4d80d3907e7607a7d4c89da.camel@physik.fu-berlin.de> Message-ID: References: <20250822145605.18172-1-ilpo.jarvinen@linux.intel.com> <20250822145605.18172-3-ilpo.jarvinen@linux.intel.com> <8fcc0fd4b74f99d5c4d80d3907e7607a7d4c89da.camel@physik.fu-berlin.de> X-Mailing-List: linuxppc-dev@lists.ozlabs.org List-Id: List-Help: List-Owner: List-Post: List-Archive: , List-Subscribe: , , List-Unsubscribe: Precedence: list MIME-Version: 1.0 Content-Type: multipart/mixed; boundary="8323328-784219086-1762794272=:1060" This message is in MIME format. The first part should be readable text, while the remaining parts are likely unreadable without MIME-aware tools. --8323328-784219086-1762794272=:1060 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE On Thu, 6 Nov 2025, John Paul Adrian Glaubitz wrote: > Hello Ilpo, >=20 > On Fri, 2025-08-22 at 17:55 +0300, Ilpo J=C3=A4rvinen wrote: > > Under arch/sparc/ there are multiple copies of pcibios_enable_device() > > but none of those seem to do anything extra beyond what > > pci_enable_resources() is supposed to do. These functions could lead to > > inconsistencies in behavior, especially now as pci_enable_resources() > > and the bridge window resource flags behavior are going to be altered > > by upcoming changes. > >=20 > > Remove all pcibios_enable_device() from arch/sparc/ so that PCI core > > can simply call into pci_enable_resources() instead using it's __weak > > version of pcibios_enable_device(). > >=20 > > Signed-off-by: Ilpo J=C3=A4rvinen > > --- > > arch/sparc/kernel/leon_pci.c | 27 --------------------------- > > arch/sparc/kernel/pci.c | 27 --------------------------- > > arch/sparc/kernel/pcic.c | 27 --------------------------- > > 3 files changed, 81 deletions(-) > >=20 > > diff --git a/arch/sparc/kernel/leon_pci.c b/arch/sparc/kernel/leon_pci.= c > > index 8de6646e9ce8..10934dfa987a 100644 > > --- a/arch/sparc/kernel/leon_pci.c > > +++ b/arch/sparc/kernel/leon_pci.c > > @@ -60,30 +60,3 @@ void leon_pci_init(struct platform_device *ofdev, st= ruct leon_pci_info *info) > > =09pci_assign_unassigned_resources(); > > =09pci_bus_add_devices(root_bus); > > } > > - > > -int pcibios_enable_device(struct pci_dev *dev, int mask) > > -{ > > -=09struct resource *res; > > -=09u16 cmd, oldcmd; > > -=09int i; > > - > > -=09pci_read_config_word(dev, PCI_COMMAND, &cmd); > > -=09oldcmd =3D cmd; > > - > > -=09pci_dev_for_each_resource(dev, res, i) { > > -=09=09/* Only set up the requested stuff */ > > -=09=09if (!(mask & (1< > -=09=09=09continue; > > - > > -=09=09if (res->flags & IORESOURCE_IO) > > -=09=09=09cmd |=3D PCI_COMMAND_IO; > > -=09=09if (res->flags & IORESOURCE_MEM) > > -=09=09=09cmd |=3D PCI_COMMAND_MEMORY; > > -=09} > > - > > -=09if (cmd !=3D oldcmd) { > > -=09=09pci_info(dev, "enabling device (%04x -> %04x)\n", oldcmd, cmd); > > -=09=09pci_write_config_word(dev, PCI_COMMAND, cmd); > > -=09} > > -=09return 0; > > -} > > diff --git a/arch/sparc/kernel/pci.c b/arch/sparc/kernel/pci.c > > index ddac216a2aff..a9448088e762 100644 > > --- a/arch/sparc/kernel/pci.c > > +++ b/arch/sparc/kernel/pci.c > > @@ -722,33 +722,6 @@ struct pci_bus *pci_scan_one_pbm(struct pci_pbm_in= fo *pbm, > > =09return bus; > > } > > =20 > > -int pcibios_enable_device(struct pci_dev *dev, int mask) > > -{ > > -=09struct resource *res; > > -=09u16 cmd, oldcmd; > > -=09int i; > > - > > -=09pci_read_config_word(dev, PCI_COMMAND, &cmd); > > -=09oldcmd =3D cmd; > > - > > -=09pci_dev_for_each_resource(dev, res, i) { > > -=09=09/* Only set up the requested stuff */ > > -=09=09if (!(mask & (1< > -=09=09=09continue; > > - > > -=09=09if (res->flags & IORESOURCE_IO) > > -=09=09=09cmd |=3D PCI_COMMAND_IO; > > -=09=09if (res->flags & IORESOURCE_MEM) > > -=09=09=09cmd |=3D PCI_COMMAND_MEMORY; > > -=09} > > - > > -=09if (cmd !=3D oldcmd) { > > -=09=09pci_info(dev, "enabling device (%04x -> %04x)\n", oldcmd, cmd); > > -=09=09pci_write_config_word(dev, PCI_COMMAND, cmd); > > -=09} > > -=09return 0; > > -} > > - > > /* Platform support for /proc/bus/pci/X/Y mmap()s. */ > > int pci_iobar_pfn(struct pci_dev *pdev, int bar, struct vm_area_struct= *vma) > > { > > diff --git a/arch/sparc/kernel/pcic.c b/arch/sparc/kernel/pcic.c > > index 25fe0a061732..3d54ad5656a4 100644 > > --- a/arch/sparc/kernel/pcic.c > > +++ b/arch/sparc/kernel/pcic.c > > @@ -641,33 +641,6 @@ void pcibios_fixup_bus(struct pci_bus *bus) > > =09} > > } > > =20 > > -int pcibios_enable_device(struct pci_dev *dev, int mask) > > -{ > > -=09struct resource *res; > > -=09u16 cmd, oldcmd; > > -=09int i; > > - > > -=09pci_read_config_word(dev, PCI_COMMAND, &cmd); > > -=09oldcmd =3D cmd; > > - > > -=09pci_dev_for_each_resource(dev, res, i) { > > -=09=09/* Only set up the requested stuff */ > > -=09=09if (!(mask & (1< > -=09=09=09continue; > > - > > -=09=09if (res->flags & IORESOURCE_IO) > > -=09=09=09cmd |=3D PCI_COMMAND_IO; > > -=09=09if (res->flags & IORESOURCE_MEM) > > -=09=09=09cmd |=3D PCI_COMMAND_MEMORY; > > -=09} > > - > > -=09if (cmd !=3D oldcmd) { > > -=09=09pci_info(dev, "enabling device (%04x -> %04x)\n", oldcmd, cmd); > > -=09=09pci_write_config_word(dev, PCI_COMMAND, cmd); > > -=09} > > -=09return 0; > > -} > > - > > /* Makes compiler happy */ > > static volatile int pcic_timer_dummy; >=20 > This change actually broke driver initialization on SPARC, see: >=20 > https://github.com/sparclinux/issues/issues/22 Does the attached patch help? 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