Keep track of how many SW cursors are visible on each screen

And use this to determine when we cannot use page flipping for DRI
clients. We previously did this based on whether the HW cursor cannot
be used on at least one CRTC, which had at least two issues:

* Even while the HW cursor cannot be used, no SW cursor may actually be
  visible (e.g. because all cursors are disabled), in which case we can
  use page flipping for DRI clients anyway
* Even while the HW cursor can be used, there may be SW cursors visible
  from non-core pointer devices, in which case we cannot use page
  flipping for DRI clients anyway

(Ported from amdgpu commit 69e20839bfeb3ee0b0a732d72de0a32d6c5435fc)
Reviewed-by: Alex Deucher <alexander.deucher@amd.com>

src/drmmode_display.c

@@ -34,6 +34,7 @@
 #include <time.h>
 #include "cursorstr.h"
 #include "damagestr.h"
+#include "inputstr.h"
 #include "list.h"
 #include "micmap.h"
 #include "xf86cmap.h"
@@ -2628,6 +2629,56 @@ Bool drmmode_set_bufmgr(ScrnInfoPtr pScrn, drmmode_ptr drmmode, struct radeon_bo
 }
 
 
+static void drmmode_sprite_do_set_cursor(struct radeon_device_priv *device_priv,
+					 ScrnInfoPtr scrn, int x, int y)
+{
+	RADEONInfoPtr info = RADEONPTR(scrn);
+	CursorPtr cursor = device_priv->cursor;
+	Bool sprite_visible = device_priv->sprite_visible;
+
+	if (cursor) {
+		x -= cursor->bits->xhot;
+		y -= cursor->bits->yhot;
+
+		device_priv->sprite_visible =
+			x < scrn->virtualX && y < scrn->virtualY &&
+			(x + cursor->bits->width > 0) &&
+			(y + cursor->bits->height > 0);
+	} else {
+		device_priv->sprite_visible = FALSE;
+	}
+
+	info->sprites_visible += device_priv->sprite_visible - sprite_visible;
+}
+
+void drmmode_sprite_set_cursor(DeviceIntPtr pDev, ScreenPtr pScreen,
+			       CursorPtr pCursor, int x, int y)
+{
+	ScrnInfoPtr scrn = xf86ScreenToScrn(pScreen);
+	RADEONInfoPtr info = RADEONPTR(scrn);
+	struct radeon_device_priv *device_priv =
+		dixLookupScreenPrivate(&pDev->devPrivates,
+				       &radeon_device_private_key, pScreen);
+
+	device_priv->cursor = pCursor;
+	drmmode_sprite_do_set_cursor(device_priv, scrn, x, y);
+
+	info->SetCursor(pDev, pScreen, pCursor, x, y);
+}
+
+void drmmode_sprite_move_cursor(DeviceIntPtr pDev, ScreenPtr pScreen, int x,
+				int y)
+{
+	ScrnInfoPtr scrn = xf86ScreenToScrn(pScreen);
+	RADEONInfoPtr info = RADEONPTR(scrn);
+	struct radeon_device_priv *device_priv =
+		dixLookupScreenPrivate(&pDev->devPrivates,
+				       &radeon_device_private_key, pScreen);
+
+	drmmode_sprite_do_set_cursor(device_priv, scrn, x, y);
+
+	info->MoveCursor(pDev, pScreen, x, y);
+}
 
 void drmmode_set_cursor(ScrnInfoPtr scrn, drmmode_ptr drmmode, int id, struct radeon_bo *bo)
 {

src/drmmode_display.h

@@ -206,6 +206,10 @@ extern Bool drmmode_pre_init(ScrnInfoPtr pScrn, drmmode_ptr drmmode, int cpp);
 extern void drmmode_init(ScrnInfoPtr pScrn, drmmode_ptr drmmode);
 extern void drmmode_fini(ScrnInfoPtr pScrn, drmmode_ptr drmmode);
 extern Bool drmmode_set_bufmgr(ScrnInfoPtr pScrn, drmmode_ptr drmmode, struct radeon_bo_manager *bufmgr);
+extern void drmmode_sprite_set_cursor(DeviceIntPtr pDev, ScreenPtr pScreen,
+				      CursorPtr pCursor, int x, int y);
+extern void drmmode_sprite_move_cursor(DeviceIntPtr pDev, ScreenPtr pScreen, int x,
+				       int y);
 extern void drmmode_set_cursor(ScrnInfoPtr scrn, drmmode_ptr drmmode, int id, struct radeon_bo *bo);
 void drmmode_adjust_frame(ScrnInfoPtr pScrn, drmmode_ptr drmmode, int x, int y);
 extern Bool drmmode_set_desired_modes(ScrnInfoPtr pScrn, drmmode_ptr drmmode,

src/radeon.h

@@ -500,6 +500,13 @@ struct radeon_client_priv {
     uint_fast32_t     needs_flush;
 };
 
+struct radeon_device_priv {
+    CursorPtr cursor;
+    Bool sprite_visible;
+};
+
+extern DevScreenPrivateKeyRec radeon_device_private_key;
+
 typedef struct {
     EntityInfoPtr     pEnt;
     pciVideoPtr       PciInfo;
@@ -550,6 +557,12 @@ typedef struct {
     CreateScreenResourcesProcPtr CreateScreenResources;
     CreateWindowProcPtr CreateWindow;
     WindowExposuresProcPtr WindowExposures;
+    void (*SetCursor) (DeviceIntPtr pDev, ScreenPtr pScreen,
+		       CursorPtr pCursor, int x, int y);
+    void (*MoveCursor) (DeviceIntPtr pDev, ScreenPtr pScreen, int x, int y);
+
+    /* Number of SW cursors currently visible on this screen */
+    int sprites_visible;
 
     Bool              IsSecondary;
 

src/radeon_dri2.c

@@ -723,7 +723,7 @@ can_flip(xf86CrtcPtr crtc, DrawablePtr draw,
 
     if (draw->type != DRAWABLE_WINDOW ||
 	!info->allowPageFlip ||
-	info->hwcursor_disabled ||
+	info->sprites_visible > 0 ||
 	info->drmmode.present_flipping ||
 	!pScrn->vtSema ||
 	!DRI2CanFlip(draw))

src/radeon_kms.c

@@ -38,6 +38,7 @@
 #include "radeon_reg.h"
 #include "radeon_probe.h"
 #include "micmap.h"
+#include "mipointrst.h"
 
 #include "radeon_version.h"
 #include "shadow.h"
@@ -66,6 +67,7 @@
 #include "radeon_vbo.h"
 
 static DevScreenPrivateKeyRec radeon_client_private_key;
+DevScreenPrivateKeyRec radeon_device_private_key;
 
 extern SymTabRec RADEONChipsets[];
 static Bool radeon_setup_kernel_mem(ScreenPtr pScreen);
@@ -1991,6 +1993,23 @@ static Bool RADEONCursorInit_KMS(ScreenPtr pScreen)
     /* Cursor setup */
     miDCInitialize(pScreen, xf86GetPointerScreenFuncs());
 
+    if (info->allowPageFlip) {
+	miPointerScreenPtr PointPriv =
+	    dixLookupPrivate(&pScreen->devPrivates, miPointerScreenKey);
+
+	if (!dixRegisterScreenPrivateKey(&radeon_device_private_key, pScreen,
+					 PRIVATE_DEVICE,
+					 sizeof(struct radeon_device_priv))) {
+	    xf86DrvMsg(pScrn->scrnIndex, X_ERROR, "dixRegisterScreenPrivateKey failed\n");
+	    return FALSE;
+	}
+
+	info->SetCursor = PointPriv->spriteFuncs->SetCursor;
+	info->MoveCursor = PointPriv->spriteFuncs->MoveCursor;
+	PointPriv->spriteFuncs->SetCursor = drmmode_sprite_set_cursor;
+	PointPriv->spriteFuncs->MoveCursor = drmmode_sprite_move_cursor;
+    }
+
     if (xf86ReturnOptValBool(info->Options, OPTION_SW_CURSOR, FALSE))
 	return TRUE;
 
@@ -2147,6 +2166,15 @@ static Bool RADEONCloseScreen_KMS(ScreenPtr pScreen)
 
     pScrn->vtSema = FALSE;
     xf86ClearPrimInitDone(info->pEnt->index);
+
+    if (info->allowPageFlip) {
+	miPointerScreenPtr PointPriv =
+	    dixLookupPrivate(&pScreen->devPrivates, miPointerScreenKey);
+
+	PointPriv->spriteFuncs->SetCursor = info->SetCursor;
+	PointPriv->spriteFuncs->MoveCursor = info->MoveCursor;
+    }
+
     pScreen->BlockHandler = info->BlockHandler;
     pScreen->CloseScreen = info->CloseScreen;
     return pScreen->CloseScreen(pScreen);

src/radeon_present.c

@@ -289,7 +289,7 @@ radeon_present_check_flip(RRCrtcPtr crtc, WindowPtr window, PixmapPtr pixmap,
     if (!info->allowPageFlip)
 	return FALSE;
 
-    if (info->hwcursor_disabled)
+    if (info->sprites_visible > 0)
 	return FALSE;
 
     if (info->drmmode.dri2_flipping)