Pin header-only pixmaps in memory.

Off-screen reallocation could have used a stale pointer.
Separate framebuffer mapping computation from actual frame buffer mapping.
    Now map the frame buffer from vesaEnable so that VT switch shares the
    same mapping code. This makes sure any shadow framebuffer is allocated
    again.

hw/kdrive/src/kaa.c

@@ -51,8 +51,10 @@ int kaaPixmapPrivateIndex;
 
 #define KAA_PIXMAP_SCORE_MOVE_IN    10
 #define KAA_PIXMAP_SCORE_MAX	    20
+#define KAA_PIXMAP_SCORE_INIT	    0
 #define KAA_PIXMAP_SCORE_MOVE_OUT   -10
 #define KAA_PIXMAP_SCORE_MIN	    -20
+#define KAA_PIXMAP_SCORE_PINNED	    1000
 
 #define MIN_OFFPIX_SIZE		(4096)
 
@@ -212,6 +214,9 @@ kaaPixmapUseScreen (PixmapPtr pPixmap)
 {
     KaaPixmapPriv (pPixmap);
 
+    if (pKaaPixmap->score == KAA_PIXMAP_SCORE_PINNED)
+	return;
+
     if (pKaaPixmap->score < KAA_PIXMAP_SCORE_MAX)
     {
 	pKaaPixmap->score++;
@@ -226,6 +231,9 @@ kaaPixmapUseMemory (PixmapPtr pPixmap)
 {
     KaaPixmapPriv (pPixmap);
 
+    if (pKaaPixmap->score == KAA_PIXMAP_SCORE_PINNED)
+	return;
+
     if (pKaaPixmap->score > KAA_PIXMAP_SCORE_MIN)
     {
 	pKaaPixmap->score--;
@@ -282,10 +290,15 @@ kaaCreatePixmap(ScreenPtr pScreen, int w, int h, int depth)
     if (!pPixmap)
 	return NULL;
     pKaaPixmap = KaaGetPixmapPriv(pPixmap);
-    pKaaPixmap->score = 0;
+    if (!w || !h)
+	pKaaPixmap->score == KAA_PIXMAP_SCORE_PINNED;
+    else
+	pKaaPixmap->score = KAA_PIXMAP_SCORE_INIT;
+    
     pKaaPixmap->area = NULL;
     
-    if ((pPixmap->devKind * h) >= MIN_OFFPIX_SIZE)
+    if (pKaaPixmap->score != KAA_PIXMAP_SCORE_PINNED &&
+	(pPixmap->devKind * h) >= MIN_OFFPIX_SIZE)
 	kaaPixmapAllocArea (pPixmap);
     return pPixmap;
 }

hw/kdrive/src/kdrive.h

@@ -882,7 +882,7 @@ KdOffscreenAlloc (ScreenPtr pScreen, int size, int align,
 		  KdOffscreenSaveProc save,
 		  pointer privData);
 
-void
+KdOffscreenArea *
 KdOffscreenFree (ScreenPtr pScreen, KdOffscreenArea *area);
 
 void

hw/kdrive/src/koffscreen.c

@@ -55,12 +55,12 @@ KdOffscreenValidate (ScreenPtr pScreen)
 #define KdOffscreenValidate(s)
 #endif
 
-static void
+static KdOffscreenArea *
 KdOffscreenKickOut (ScreenPtr pScreen, KdOffscreenArea *area)
 {
     if (area->save)
 	(*area->save) (pScreen, area);
-    KdOffscreenFree (pScreen, area);
+    return KdOffscreenFree (pScreen, area);
 }
 
 KdOffscreenArea *
@@ -161,14 +161,14 @@ KdOffscreenAlloc (ScreenPtr pScreen, int size, int align,
 	 * Kick out first area if in use
 	 */
 	if (area->state != KdOffscreenAvail)
-	    KdOffscreenKickOut (pScreen, area);
+	    area = KdOffscreenKickOut (pScreen, area);
 	/*
 	 * Now get the system to merge the other needed areas together
 	 */
 	while (area->size < real_size)
 	{
 	    assert (area->next && area->next->state == KdOffscreenRemovable);
-	    KdOffscreenKickOut (pScreen, area->next);
+	    (void) KdOffscreenKickOut (pScreen, area->next);
 	}
     }
     
@@ -225,7 +225,7 @@ KdOffscreenSwapOut (ScreenPtr pScreen)
 		break;
 	}
 	assert (area->state != KdOffscreenAvail);
-	KdOffscreenKickOut (pScreen, area);
+	(void) KdOffscreenKickOut (pScreen, area);
 	KdOffscreenValidate (pScreen);
     }    
     KdOffscreenValidate (pScreen);
@@ -251,7 +251,7 @@ KdOffscreenMerge (KdOffscreenArea *area)
     xfree (next);
 }
 
-void
+KdOffscreenArea *
 KdOffscreenFree (ScreenPtr pScreen, KdOffscreenArea *area)
 {
     KdScreenPriv(pScreen);
@@ -281,9 +281,13 @@ KdOffscreenFree (ScreenPtr pScreen, KdOffscreenArea *area)
     
     /* link with prev area if free */
     if (prev && prev->state == KdOffscreenAvail)
-	KdOffscreenMerge (prev);
+    {
+	area = prev;
+	KdOffscreenMerge (area);
+    }
 
     KdOffscreenValidate (pScreen);
+    return area;
 }
 
 Bool

hw/kdrive/vesa/vesa.c

@@ -47,6 +47,12 @@ Bool vesa_map_holes = TRUE;
 #define vesaWidth(scr,vmib) ((vmib)->XResolution)
 #define vesaHeight(scr,vmib) ((vmib)->YResolution)
 
+static Bool
+vesaComputeFramebufferMapping (KdScreenInfo *screen);
+
+static Bool
+vesaMapFramebuffer (KdScreenInfo    *screen);
+    
 static Bool
 vesaModeSupportable (VesaModePtr mode, Bool complain)
 {
@@ -507,7 +513,11 @@ vesaScreenInitialize (KdScreenInfo *screen, VesaScreenPrivPtr pscr)
     }
     screen->rate = 72;
 
-    return vesaMapFramebuffer (screen);
+    if (!vesaComputeFramebufferMapping (screen))
+	return FALSE;
+    if (!vesaMapFramebuffer (screen))
+	return FALSE;
+    return TRUE;
 }
 
 Bool
@@ -850,10 +860,9 @@ vesaSetShadow (ScreenPtr pScreen)
     return KdShadowSet (pScreen, pscr->randr, update, window);
 }
 
-Bool
-vesaMapFramebuffer (KdScreenInfo    *screen)
+static Bool
+vesaComputeFramebufferMapping (KdScreenInfo *screen)
 {
-    VesaCardPrivPtr	priv = screen->card->driver;
     VesaScreenPrivPtr	pscr = screen->driver;
     int			depth, bpp, fbbpp;
     Pixel		allbits;
@@ -956,7 +965,27 @@ vesaMapFramebuffer (KdScreenInfo    *screen)
 	pscr->mapping = VESA_WINDOWED;
 	pscr->shadow = TRUE;
     }
+    KdComputeMouseMatrix (&m, pscr->randr, 
+			  pscr->mode.XResolution, pscr->mode.YResolution);
     
+    KdSetMouseMatrix (&m);
+    
+    screen->width = pscr->mode.XResolution;
+    screen->height = pscr->mode.YResolution;
+    screen->fb[0].depth = depth;
+    screen->fb[0].bitsPerPixel = bpp;
+
+    return TRUE;
+}
+
+static Bool
+vesaMapFramebuffer (KdScreenInfo    *screen)
+{
+    VesaCardPrivPtr	priv = screen->card->driver;
+    VesaScreenPrivPtr	pscr = screen->driver;
+
+    if (pscr->mapped)
+	return TRUE;
     switch (pscr->mapping) {
     case VESA_MONO:
     case VESA_LINEAR:
@@ -981,17 +1010,8 @@ vesaMapFramebuffer (KdScreenInfo    *screen)
 	break;
     }
     
-    KdComputeMouseMatrix (&m, pscr->randr, 
-			  pscr->mode.XResolution, pscr->mode.YResolution);
-    
-    KdSetMouseMatrix (&m);
-    
-    screen->width = pscr->mode.XResolution;
-    screen->height = pscr->mode.YResolution;
     screen->memory_base = pscr->fb;
     screen->memory_size = pscr->fb_size;
-    screen->fb[0].depth = depth;
-    screen->fb[0].bitsPerPixel = bpp;
     
     if (pscr->shadow)
     {
@@ -1008,16 +1028,21 @@ vesaMapFramebuffer (KdScreenInfo    *screen)
 				     screen->fb[0].bitsPerPixel);
 	screen->off_screen_base = screen->fb[0].byteStride * screen->height;
     }
+    pscr->mapped = TRUE;
     
     return TRUE;
 }
 
-void
+static void
 vesaUnmapFramebuffer (KdScreenInfo  *screen)
 {
     VesaCardPrivPtr	    priv = screen->card->driver;
     VesaScreenPrivPtr	    pscr = screen->driver;
     
+    if (!pscr->mapped)
+	return;
+    
+    pscr->mapped = FALSE;
     KdShadowFbFree (screen, 0);
     if (pscr->fb)
     {
@@ -1201,6 +1226,9 @@ vesaRandRSetConfig (ScreenPtr		pScreen,
     
     vesaUnmapFramebuffer (screen);
     
+    if (!vesaComputeFramebufferMapping (screen))
+	goto bail3;
+
     if (!vesaMapFramebuffer (screen))
 	goto bail3;
     
@@ -1231,6 +1259,7 @@ vesaRandRSetConfig (ScreenPtr		pScreen,
 bail4:
     vesaUnmapFramebuffer (screen);
     *pscr = oldscr;
+    (void) vesaComputeFramebufferMapping (screen);
     (void) vesaMapFramebuffer (screen);
     
 bail3:
@@ -1332,6 +1361,10 @@ vesaEnable(ScreenPtr pScreen)
     int			i;
     CARD32		size;
     char		*p;
+    Bool		was_mapped = pscr->mapped;
+
+    if (!vesaMapFramebuffer (screen))
+	return FALSE;
 
     if (!vesaSetMode (pScreen, &pscr->mode))
 	return FALSE;
@@ -1340,39 +1373,6 @@ vesaEnable(ScreenPtr pScreen)
     case VESA_MONO:
 	VgaSetWritePlaneMask (priv->vi, 0x1);
     case VESA_LINEAR:
-	/*
-	 * Remap the frame buffer if necessary
-	 */
-	if (!pscr->fb)
-	{
-	    if (pscr->mode.vbe)
-		pscr->fb = VbeMapFramebuffer(priv->vi, priv->vbeInfo, 
-					     pscr->mode.mode,
-					     &pscr->fb_size,
-					     &pscr->fb_phys);
-	    else
-		pscr->fb = VgaMapFramebuffer (priv->vi, 
-					      pscr->mode.mode,
-					      &pscr->fb_size,
-					      &pscr->fb_phys);
-	    if (!pscr->fb)
-		return FALSE;
-	    screen->fb[0].frameBuffer = (CARD8 *)(pscr->fb);
-	    screen->memory_base = pscr->fb;
-	    /*
-	     * Set frame buffer mapping
-	     */
-	    if (!pscr->shadow)
-	    {
-		(*pScreen->ModifyPixmapHeader) (fbGetScreenPixmap (pScreen),
-						pScreen->width,
-						pScreen->height,
-						screen->fb[0].depth,
-						screen->fb[0].bitsPerPixel,
-						screen->fb[0].byteStride,
-						screen->fb[0].frameBuffer);
-	    }
-	}
 	if (vesa_restore_font)
 	    memcpy (priv->text, pscr->fb, VESA_TEXT_SAVE);
 	break;
@@ -1405,6 +1405,16 @@ vesaEnable(ScreenPtr pScreen)
 	}
 	break;
     }
+    if (!was_mapped)
+    {
+	(*pScreen->ModifyPixmapHeader) (fbGetScreenPixmap (pScreen),
+					pScreen->width,
+					pScreen->height,
+					screen->fb[0].depth,
+					screen->fb[0].bitsPerPixel,
+					screen->fb[0].byteStride,
+					screen->fb[0].frameBuffer);
+    }
     return TRUE;
 }
 

hw/kdrive/vesa/vesa.h

@@ -102,6 +102,7 @@ typedef struct _VesaScreenPriv {
     int		fb_size;
     CARD32	fb_phys;
     PixmapPtr	pShadow;
+    Bool	mapped;
 } VesaScreenPrivRec, *VesaScreenPrivPtr;
 
 extern int vesa_video_mode;
@@ -223,12 +224,6 @@ vesaScreenInit(KdScreenInfo *screen);
 PixmapPtr
 vesaGetPixmap (ScreenPtr pScreen);
 
-Bool
-vesaMapFramebuffer (KdScreenInfo    *screen);
-
-void
-vesaUnmapFramebuffer (KdScreenInfo  *screen);
-
 Bool
 vesaInitScreen(ScreenPtr pScreen);