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-rw-r--r--drivers/ntb/ntb_transport.c13
1 files changed, 13 insertions, 0 deletions
diff --git a/drivers/ntb/ntb_transport.c b/drivers/ntb/ntb_transport.c
index 611fef48bdc3..e9bf2f47b61a 100644
--- a/drivers/ntb/ntb_transport.c
+++ b/drivers/ntb/ntb_transport.c
@@ -576,6 +576,19 @@ static int ntb_set_mw(struct ntb_transport *nt, int num_mw, unsigned int size)
return -ENOMEM;
}
+ /*
+ * we must ensure that the memory address allocated is BAR size
+ * aligned in order for the XLAT register to take the value. This
+ * is a requirement of the hardware. It is recommended to setup CMA
+ * for BAR sizes equal or greater than 4MB.
+ */
+ if (!IS_ALIGNED(mw->dma_addr, mw->size)) {
+ dev_err(&pdev->dev, "DMA memory %pad not aligned to BAR size\n",
+ &mw->dma_addr);
+ ntb_free_mw(nt, num_mw);
+ return -ENOMEM;
+ }
+
/* Notify HW the memory location of the receive buffer */
ntb_set_mw_addr(nt->ndev, num_mw, mw->dma_addr);