And here goes the proposed patch, for those of you interested. I would like 
some feedback about the solutions adopted (for the interlocking and also the 
host.def changes) before updating the CVS branch.


El Sáb 27 Oct 2001 12:35, Manuel Teira escribió:
> El Vie 26 Oct 2001 22:11, Leif Delgass escribió:
> > Manuel, the hang when switching back from a vt to X with Quake running
> > hangs both in fullscreen and windowed mode (other GL apps like gears
> > don't exhibit this problem, although there is initially some garbage at
> > the top of the screen when returning to X).  I'm sure you're right that
> > it has to do with the locking (or lack thereof) in the enter/leaveVT. 
> > And with that I'm heading out, I'll try to do some more investigation
> > tommorow...
>
> Well. I've written a pair of macros to interlock drm and Xdriver and used
> it in all the accelerated access from the XDriver. I've also used the
> DRILock/DRIUnlock API to lock the ATILeaveVT and ATIEnterVT in the
> aticonsole.c file. After this, we cannot enable 2D accelerated rendering
> yet, because the drm and mesa sides are not honouring this interlocking.
> This should be made when Frank has  the new DMA API finished, because the
> points to lock will be less than now (I suppose that we only will need to
> lock the actual DMA transfers) because the DMAOUTREG is only going to
> append the register writes to a DMA buffer. So, I suppose that the
> EnterVT/LeaveVT bug is still here, because of a non locking DRM.
>
> Anyway, I tried to reenable 2D acceleration and run gears. The engine
> locked after trying to close gears, but the cursor still worked.
>
> My idea is updating the branch with this changes (still without reenabling
> the 2D acceleration) and Leif ones for the AGP corrections. Leif, I've
> (#ifdef)ed the AGP code as you told me, but I think that your host.def
> changes are good for the mach64 branch (disabling the Glide dependencies
> and enabling builds of DRM drivers) and I plan update it too.
>
> Another secondary issue: I'm still have a problem compiling the branch: The
> xf86cfg directory in programs/Xserver/hw/xfree86 needs a lot of shared
> libraries and I think that there is no need to build this utilities in the
> DRI context. So, I'm also going to add another change to the host.def file:
>
> -#define BuildXFree86ConfigTools YES
> +#define BuildXFree86ConfigTools NO
>
> In this way, the Imakefile in programs/Xserver/hw/xfree86 will disable this
> tools build:
> ...
> #if !BuildServersOnly || BuildXFree86ConfigTools
> XF86CFGDIRS = xf86cfg xf86config
> #endif
> ...
>
> and we will need less libraries.
>
> Finally, and to accelerate the build, the line:
>
> #define XF86CardDrivers tdfx i810 mga ati glint vga
>
> should be:
>
> #define XF86CardDrivers ati
>
> And perhaps:
>
> #define XFree86CustomVersion "DRI trunk"
>
> should be replaced by:
>
> #define XFree86CustomVersion "DRI mach64 branch"
>
>
> Do you agree ?
>
>
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Patch against mach64 branch (27-10-2001). Leif Delgass code clean and Manuel Teira Locking proposal.

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