Date: Wed, 14 Dec 2005 17:20:00 -0500 From: John Baldwin <jhb@freebsd.org> To: current@freebsd.org Cc: anholt@freebsd.org Subject: hostb(4) and vgapci(4) patch Message-ID: <200512141720.01572.jhb@freebsd.org>
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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. http://www.FreeBSD.org/~jhb/patches/agp_cvs.patch -- John Baldwin <jhb@FreeBSD.org> <>< http://www.FreeBSD.org/~jhb/ "Power Users Use the Power to Serve" = http://www.FreeBSD.org
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