NTB: Clear property bits in BAR value

The lower bits read from a BAR register will contain property bits
that we do not care about. Clear those so that we can use the BAR
values for limit and xlat registers.

Reported-by: Conrad Meyer <cem@freebsd.org>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Jon Mason <jdmason@kudzu.us>

drivers/ntb/hw/intel/ntb_hw_intel.c

@@ -875,7 +875,7 @@ static int intel_ntb_mw_set_trans(struct ntb_dev *ntb, int idx,
 	limit_reg = bar2_off(ndev->xlat_reg->bar2_limit, bar);
 
 	if (bar < 4 || !ndev->bar4_split) {
-		base = ioread64(mmio + base_reg);
+		base = ioread64(mmio + base_reg) & NTB_BAR_MASK_64;
 
 		/* Set the limit if supported, if size is not mw_size */
 		if (limit_reg && size != mw_size)
@@ -906,7 +906,7 @@ static int intel_ntb_mw_set_trans(struct ntb_dev *ntb, int idx,
 		if ((addr + size) & (~0ull << 32))
 			return -EINVAL;
 
-		base = ioread32(mmio + base_reg);
+		base = ioread32(mmio + base_reg) & NTB_BAR_MASK_32;
 
 		/* Set the limit if supported, if size is not mw_size */
 		if (limit_reg && size != mw_size)

drivers/ntb/hw/intel/ntb_hw_intel.h

@@ -245,6 +245,9 @@
 #define NTB_UNSAFE_DB			BIT_ULL(0)
 #define NTB_UNSAFE_SPAD			BIT_ULL(1)
 
+#define NTB_BAR_MASK_64			~(0xfull)
+#define NTB_BAR_MASK_32			~(0xfu)
+
 struct intel_ntb_dev;
 
 struct intel_ntb_reg {