hostb(4) and vgapci(4) patch

Eric Anderson anderson at
Wed Dec 14 19:32:49 PST 2005

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 
>- 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 
>- 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: In function `agp_i810_detach':
/usr/src/sys/pci/agp_i810.c:463: warning: unused variable `child'
*** Error code 1

Stop in /usr/obj/usr/src/sys/NEUTRINO.
*** Error code 1

Stop in /usr/src.
*** Error code 1

Stop in /usr/src.

7.0-CURRENT #48: Tue Dec 13 08:47:11 CST 2005

Anything else you would like?


Eric Anderson        Sr. Systems Administrator        Centaur Technology
Anything that works is better than anything that doesn't.

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