powerpc/vas: Save configured window credits

Save the configured max window credits for a window in the vas_window
structure. We will need this when polling for return of window credits.

Signed-off-by: Sukadev Bhattiprolu <sukadev@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

arch/powerpc/platforms/powernv/vas-window.c

@@ -674,7 +674,7 @@ static void init_winctx_for_rxwin(struct vas_window *rxwin,
 
 	winctx->rx_fifo = rxattr->rx_fifo;
 	winctx->rx_fifo_size = rxattr->rx_fifo_size;
-	winctx->wcreds_max = rxattr->wcreds_max ?: VAS_WCREDS_DEFAULT;
+	winctx->wcreds_max = rxwin->wcreds_max;
 	winctx->pin_win = rxattr->pin_win;
 
 	winctx->nx_win = rxattr->nx_win;
@@ -844,6 +844,7 @@ struct vas_window *vas_rx_win_open(int vasid, enum vas_cop_type cop,
 	rxwin->nx_win = rxattr->nx_win;
 	rxwin->user_win = rxattr->user_win;
 	rxwin->cop = cop;
+	rxwin->wcreds_max = rxattr->wcreds_max ?: VAS_WCREDS_DEFAULT;
 	if (rxattr->user_win)
 		rxwin->pid = task_pid_vnr(current);
 
@@ -893,7 +894,7 @@ static void init_winctx_for_txwin(struct vas_window *txwin,
 	 */
 	memset(winctx, 0, sizeof(struct vas_winctx));
 
-	winctx->wcreds_max = txattr->wcreds_max ?: VAS_WCREDS_DEFAULT;
+	winctx->wcreds_max = txwin->wcreds_max;
 
 	winctx->user_win = txattr->user_win;
 	winctx->nx_win = txwin->rxwin->nx_win;
@@ -978,6 +979,7 @@ struct vas_window *vas_tx_win_open(int vasid, enum vas_cop_type cop,
 	txwin->nx_win = txwin->rxwin->nx_win;
 	txwin->pid = attr->pid;
 	txwin->user_win = attr->user_win;
+	txwin->wcreds_max = attr->wcreds_max ?: VAS_WCREDS_DEFAULT;
 
 	init_winctx_for_txwin(txwin, attr, &winctx);
 

arch/powerpc/platforms/powernv/vas.h

@@ -332,6 +332,7 @@ struct vas_window {
 	void *hvwc_map;		/* HV window context */
 	void *uwc_map;		/* OS/User window context */
 	pid_t pid;		/* Linux process id of owner */
+	int wcreds_max;		/* Window credits */
 
 	/* Fields applicable only to send windows */
 	void *paste_kaddr;