Date: Tue, 23 Dec 2008 18:33:22 +0100 From: Andre Albsmeier <Andre.Albsmeier@siemens.com> To: Andre Albsmeier <Andre.Albsmeier@siemens.com> Cc: freebsd-hackers@freebsd.org Subject: Re: How to "detach" a foreign driver from a device so my driver can attach? Message-ID: <20081223173322.GA4123@curry.mchp.siemens.de> In-Reply-To: <20081216230430.GA24352@curry.mchp.siemens.de> References: <20081216230430.GA24352@curry.mchp.siemens.de>
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On Wed, 17-Dec-2008 at 00:04:30 +0100, Andre Albsmeier wrote: > Hello all, > > I am writing a driver which attaches to the Host-PCI bridge. When > compiled into the kernel or loaded by the loader everything works > and the driver gets attached. This is due to the fact that I return > BUS_PROBE_SPECIFIC in my probe routine which gains over the -10000 > returned by pci_hostb_probe() in i386/pci/pci_bus.c. > > However, when I want to load my driver via kldload this fails since > the hostb device has already been attached during kernel load (when > my driver was not present): > > hostb0@pci0:0:0: class=0x060000 card=0x11d510cf chip=0x35808086 rev=0x02 hdr=0x00 > > What can I do to make my driver load via kldload? > Is there a way to detach the hostb0 from the Host-PCI bridge? Found the answer myself but will post it here in case anyone got a similar problem one day: I added the device detach method for the hostb driver to sys/i386/pci/pci_bus.c: --- sys/i386/pci/pci_bus.c.ORI 2007-08-17 08:12:33.000000000 +0200 +++ sys/i386/pci/pci_bus.c 2008-12-23 13:34:35.000000000 +0100 @@ -619,10 +619,13 @@ return 0; } +static int pci_hostb_detach(device_t dev) { return 0; } + static device_method_t pci_hostb_methods[] = { /* Device interface */ DEVMETHOD(device_probe, pci_hostb_probe), DEVMETHOD(device_attach, pci_hostb_attach), + DEVMETHOD(device_detach, pci_hostb_detach), DEVMETHOD(device_shutdown, bus_generic_shutdown), DEVMETHOD(device_suspend, bus_generic_suspend), DEVMETHOD(device_resume, bus_generic_resume), Now, when kldload'ing my driver, it can walk through all devices and detach hostb using device_detach(). -Andre
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