NTB: Use DMA Engine to Transmit and Receive
Allocate and use a DMA engine channel to transmit and receive data over
NTB. If none is allocated, fall back to using the CPU to transfer data.
Signed-off-by: Jon Mason <jon.mason@intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
diff --git a/drivers/ntb/ntb_hw.c b/drivers/ntb/ntb_hw.c
index ab34795..0345817 100644
--- a/drivers/ntb/ntb_hw.c
+++ b/drivers/ntb/ntb_hw.c
@@ -350,6 +350,23 @@
}
/**
+ * ntb_get_mw_base() - get addr for the NTB memory window
+ * @ndev: pointer to ntb_device instance
+ * @mw: memory window number
+ *
+ * This function provides the base address of the memory window specified.
+ *
+ * RETURNS: address, or NULL on error.
+ */
+resource_size_t ntb_get_mw_base(struct ntb_device *ndev, unsigned int mw)
+{
+ if (mw >= ntb_max_mw(ndev))
+ return 0;
+
+ return pci_resource_start(ndev->pdev, MW_TO_BAR(mw));
+}
+
+/**
* ntb_get_mw_vbase() - get virtual addr for the NTB memory window
* @ndev: pointer to ntb_device instance
* @mw: memory window number