hostb(4) and vgapci(4) patch

John Baldwin jhb at
Thu Dec 15 09:57:18 PST 2005

On Wednesday 14 December 2005 10:32 pm, Eric Anderson wrote:
> John Baldwin wrote:
> >I have a patch that is an attempt to untangle a few things in relation to
> >Host-PCI bridges and VGA PCI devices.  Basically, the change is to create
> > a more "real" hostb driver as well as a new vgapci driver and to change
> > agp, drm, and acpi_video to attach to these drivers.  This means among
> > other things:
> >
> >- In theory you can now kldload agp after boot since it still has a place
> > to attach to.
> >- i830/915 drm is no longer a child of agp, instead both become children
> > of vgapci0.
> >- You can now use acpi_video with drm as both attach as children of
> > vgapci0. - This provides a way for us to possibly solve the DPMS problem
> > for suspend/resume (including a cleaner way to do the hack dpms patch I
> > posted to acpi@ a long while ago that several people still use).
> >
> >Some other details include:
> >
> >- agp devices no longer map the _entire_ aperture into contiguous KVA
> > meaning that it might be possible now to use a 256 MB aperture without
> > panicing - I've added a new pci_if.m method for locating a specific
> > capability for a PCI device.
> >
> >I have tested this on my laptop and verified that dri still works, but it
> >needs some wider testing, especially the i830/i915 case is slightly more
> >complicated.  Also, this is not going to work with the nvidia-driver
> >currently, but that's something that can be fixed in the future.  If the
> > agp non-mapping does fix the 256 MB aperture issues then I will probably
> > MFC that part to RELENG_6.
> >
> >
> cc -c -O2 -pipe -fno-strict-aliasing -march=pentiumpro -Wall
> -Wredundant-decls -Wnested-externs -Wstrict-prototypes
> -Wmissing-prototypes -Wpointer-arith -Winline -Wcast-qual
> -fformat-extensions -std=c99 -g -nostdinc -I-  -I. -I/usr/src/sys
> -I/usr/src/sys/contrib/altq -D_KERNEL -DHAVE_KERNEL_OPTION_HEADERS
> -include opt_global.h -fno-common -finline-limit=8000 --param
> inline-unit-growth=100 --param large-function-growth=1000
> -mno-align-long-strings -mpreferred-stack-boundary=2  -mno-mmx
> -mno-3dnow -mno-sse -mno-sse2 -mno-sse3 -ffreestanding -Werror
> /usr/src/sys/pci/agp_i810.c
> /usr/src/sys/pci/agp_i810.c: In function `agp_i810_detach':
> /usr/src/sys/pci/agp_i810.c:463: warning: unused variable `child'
> *** Error code 1

If you delete this line to fix the warning does it work ok?

John Baldwin <jhb at>  <><
"Power Users Use the Power to Serve"  =

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