[PATCH] Re-fix DGA removal.

[Peter Hutterer]

On Tue, Sep 29, 2009 at 11:34:24AM -0700, Keith Packard wrote:
> Removing DGA ended up breaking any drivers calling into the old
> xf86DiDGAInit function as it tried to see if DGA was already enabled
> and ended up crashing if the VT wasn't completely initialized. Oops.
> 
> Also, if the driver initializes DGA itself, have the DiDGA
> initialization overwrite that information as the DiDGA code will call
> ReInit on mode detect.
> 
> Signed-off-by: Keith Packard <keithp at keithp.com>
> ---
>  hw/xfree86/common/xf86DGA.c  |   29 ++++++++++++++++-------------
>  hw/xfree86/modes/xf86Crtc.c  |    4 ++--
>  hw/xfree86/modes/xf86Crtc.h  |    8 ++++++++
>  hw/xfree86/modes/xf86DiDGA.c |   15 ++++++++++++---
>  4 files changed, 38 insertions(+), 18 deletions(-)
> 
> diff --git a/hw/xfree86/common/xf86DGA.c b/hw/xfree86/common/xf86DGA.c
> index 42b7c58..804fd37 100644
> --- a/hw/xfree86/common/xf86DGA.c
> +++ b/hw/xfree86/common/xf86DGA.c
> @@ -120,8 +120,22 @@ DGAInit(
>  
>      DGAScreenKey = &DGAScreenKeyIndex;
>  
> -    if(!(pScreenPriv = (DGAScreenPtr)xalloc(sizeof(DGAScreenRec))))
> -	return FALSE;
> +    pScreenPriv = DGA_GET_SCREEN_PRIV(pScreen);
> +
> +    if (!pScreenPriv)
> +    {
> +	if(!(pScreenPriv = (DGAScreenPtr)xalloc(sizeof(DGAScreenRec))))
> +	    return FALSE;
> +	dixSetPrivate(&pScreen->devPrivates, DGAScreenKey, pScreenPriv);
> +	pScreenPriv->CloseScreen = pScreen->CloseScreen;
> +	pScreen->CloseScreen = DGACloseScreen;
> +	pScreenPriv->DestroyColormap = pScreen->DestroyColormap;
> +	pScreen->DestroyColormap = DGADestroyColormap;
> +	pScreenPriv->InstallColormap = pScreen->InstallColormap;
> +	pScreen->InstallColormap = DGAInstallColormap;
> +	pScreenPriv->UninstallColormap = pScreen->UninstallColormap;
> +	pScreen->UninstallColormap = DGAUninstallColormap;
> +    }
>  
>      pScreenPriv->pScrn = pScrn;
>      pScreenPriv->numModes = num;
> @@ -146,17 +160,6 @@ DGAInit(
>  	    modes[i].flags &= ~DGA_PIXMAP_AVAILABLE;
>  #endif
>  
> -    dixSetPrivate(&pScreen->devPrivates, DGAScreenKey, pScreenPriv);
> -    pScreenPriv->CloseScreen = pScreen->CloseScreen;
> -    pScreen->CloseScreen = DGACloseScreen;
> -    pScreenPriv->DestroyColormap = pScreen->DestroyColormap;
> -    pScreen->DestroyColormap = DGADestroyColormap;
> -    pScreenPriv->InstallColormap = pScreen->InstallColormap;
> -    pScreen->InstallColormap = DGAInstallColormap;
> -    pScreenPriv->UninstallColormap = pScreen->UninstallColormap;
> -    pScreen->UninstallColormap = DGAUninstallColormap;
> -
> -
>      return TRUE;
>  }
>  
> diff --git a/hw/xfree86/modes/xf86Crtc.c b/hw/xfree86/modes/xf86Crtc.c
> index c1e31e0..f274725 100644
> --- a/hw/xfree86/modes/xf86Crtc.c
> +++ b/hw/xfree86/modes/xf86Crtc.c
> @@ -806,7 +806,7 @@ xf86CrtcScreenInit (ScreenPtr screen)
>      screen->CloseScreen = xf86CrtcCloseScreen;
>      
>  #ifdef XFreeXDGA
> -    xf86DiDGAInit(screen, 0);
> +    _xf86_di_dga_init_for_reals(screen);
>  #endif
>  #ifdef RANDR_13_INTERFACE
>      return RANDR_INTERFACE_VERSION;
> @@ -1928,7 +1928,7 @@ xf86SetScrnInfoModes (ScrnInfoPtr scrn)
>      scrn->currentMode = scrn->modes;
>  #ifdef XFreeXDGA
>      if (scrn->pScreen)
> -	    xf86DiDGAReInit(scrn->pScreen);
> +	    _xf86_di_dga_reinit_for_reals(scrn->pScreen);
>  #endif
>  }
>  
> diff --git a/hw/xfree86/modes/xf86Crtc.h b/hw/xfree86/modes/xf86Crtc.h
> index 69afaa5..edf84d8 100644
> --- a/hw/xfree86/modes/xf86Crtc.h
> +++ b/hw/xfree86/modes/xf86Crtc.h
> @@ -833,6 +833,10 @@ xf86OutputGetEDID (xf86OutputPtr output, I2CBusPtr pDDCBus);
>  extern _X_EXPORT Bool
>  xf86DiDGAInit (ScreenPtr pScreen, unsigned long dga_address);
>  
> +/* this is the real function, used only internally */
> +_X_INTERNAL Bool
> +_xf86_di_dga_init_for_reals (ScreenPtr pScreen);

s/_for_reals//
yes, it's boring. but jokes like that only work for a short time. 
For example, anyone tell me what *exactly* party_like_its_1989 does when
set? No? Thought so. Leave jokes and general expressions of hatred for the
comments and commit messages.

> +
>  /**
>   * Re-initialize dga for this screen (as when the set of modes changes)
>   */
> @@ -841,6 +845,10 @@ extern _X_EXPORT Bool
>  xf86DiDGAReInit (ScreenPtr pScreen);
>  #endif
>  
> +/* This is the real function, used only internally */
> +_X_INTERNAL Bool
> +_xf86_di_dga_reinit_for_reals (ScreenPtr pScreen);
> +
>  /*
>   * Set the subpixel order reported for the screen using
>   * the information from the outputs
> diff --git a/hw/xfree86/modes/xf86DiDGA.c b/hw/xfree86/modes/xf86DiDGA.c
> index 0f7b834..3df3754 100644
> --- a/hw/xfree86/modes/xf86DiDGA.c
> +++ b/hw/xfree86/modes/xf86DiDGA.c
> @@ -175,6 +175,12 @@ static DGAFunctionRec xf86_dga_funcs = {
>  Bool
>  xf86DiDGAReInit (ScreenPtr pScreen)
>  {
> +    return TRUE;
> +}
> +
> +_X_INTERNAL Bool

no _X_INTERNAL here if it's already in the header files

> +_xf86_di_dga_reinit_for_reals (ScreenPtr pScreen)
> +{
>      ScrnInfoPtr		scrn = xf86Screens[pScreen->myNum];
>      xf86CrtcConfigPtr   xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
>      
> @@ -190,12 +196,15 @@ xf86DiDGAReInit (ScreenPtr pScreen)
>  Bool
>  xf86DiDGAInit (ScreenPtr pScreen, unsigned long dga_address)
>  {
> +    return TRUE;
> +}
> +
> +_X_INTERNAL Bool

same here.

Cheers,
  Peter

> +_xf86_di_dga_init_for_reals (ScreenPtr pScreen)
> +{
>      ScrnInfoPtr		scrn = xf86Screens[pScreen->myNum];
>      xf86CrtcConfigPtr   xf86_config = XF86_CRTC_CONFIG_PTR(scrn);
>  
> -    if (DGAAvailable(pScreen->myNum))
> -	return TRUE;
> -
>      xf86_config->dga_flags = 0;
>      xf86_config->dga_address = 0;
>      xf86_config->dga_width = 0;
> -- 
> 1.6.4.3