myri10ge: use pci_map_page to prepare the dmatest buffer

Allocate a specific page and use pci_map_page for dma test instead
of relying on another existing buffer.

Signed-off-by: Brice Goglin <brice@myri.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 16 insertions, 6 deletions

diff --git a/drivers/net/myri10ge/myri10ge.c b/drivers/net/myri10ge/myri10ge.c
index db282ed9ab7d..eab9b5acd0cf 100644
--- a/drivers/net/myri10ge/myri10ge.c
+++ b/drivers/net/myri10ge/myri10ge.c
@@ -717,6 +717,8 @@ static int myri10ge_reset(struct myri10ge_priv *mgp)
         int status;
         size_t bytes;
         u32 len;
+        struct page *dmatest_page;
+        dma_addr_t dmatest_bus;
 
         /* try to send a reset command to the card to see if it
          * is alive */
@@ -726,6 +728,11 @@ static int myri10ge_reset(struct myri10ge_priv *mgp)
                 dev_err(&mgp->pdev->dev, "failed reset\n");
                 return -ENXIO;
         }
+        dmatest_page = alloc_page(GFP_KERNEL);
+        if (!dmatest_page)
+                return -ENOMEM;
+        dmatest_bus = pci_map_page(mgp->pdev, dmatest_page, 0, PAGE_SIZE,
+                                   DMA_BIDIRECTIONAL);
 
         /* Now exchange information about interrupts  */
 
@@ -764,8 +771,8 @@ static int myri10ge_reset(struct myri10ge_priv *mgp)
 
         len = mgp->tx.boundary;
 
-        cmd.data0 = MYRI10GE_LOWPART_TO_U32(mgp->rx_done.bus);
-        cmd.data1 = MYRI10GE_HIGHPART_TO_U32(mgp->rx_done.bus);
+        cmd.data0 = MYRI10GE_LOWPART_TO_U32(dmatest_bus);
+        cmd.data1 = MYRI10GE_HIGHPART_TO_U32(dmatest_bus);
         cmd.data2 = len * 0x10000;
         status = myri10ge_send_cmd(mgp, MXGEFW_DMA_TEST, &cmd, 0);
         if (status == 0)
@@ -774,8 +781,8 @@ static int myri10ge_reset(struct myri10ge_priv *mgp)
         else
                 dev_warn(&mgp->pdev->dev, "DMA read benchmark failed: %d\n",
                          status);
-        cmd.data0 = MYRI10GE_LOWPART_TO_U32(mgp->rx_done.bus);
-        cmd.data1 = MYRI10GE_HIGHPART_TO_U32(mgp->rx_done.bus);
+        cmd.data0 = MYRI10GE_LOWPART_TO_U32(dmatest_bus);
+        cmd.data1 = MYRI10GE_HIGHPART_TO_U32(dmatest_bus);
         cmd.data2 = len * 0x1;
         status = myri10ge_send_cmd(mgp, MXGEFW_DMA_TEST, &cmd, 0);
         if (status == 0)
@@ -785,8 +792,8 @@ static int myri10ge_reset(struct myri10ge_priv *mgp)
                 dev_warn(&mgp->pdev->dev, "DMA write benchmark failed: %d\n",
                          status);
 
-        cmd.data0 = MYRI10GE_LOWPART_TO_U32(mgp->rx_done.bus);
-        cmd.data1 = MYRI10GE_HIGHPART_TO_U32(mgp->rx_done.bus);
+        cmd.data0 = MYRI10GE_LOWPART_TO_U32(dmatest_bus);
+        cmd.data1 = MYRI10GE_HIGHPART_TO_U32(dmatest_bus);
         cmd.data2 = len * 0x10001;
         status = myri10ge_send_cmd(mgp, MXGEFW_DMA_TEST, &cmd, 0);
         if (status == 0)
@@ -796,6 +803,9 @@ static int myri10ge_reset(struct myri10ge_priv *mgp)
                 dev_warn(&mgp->pdev->dev,
                          "DMA read/write benchmark failed: %d\n", status);
 
+        pci_unmap_page(mgp->pdev, dmatest_bus, PAGE_SIZE, DMA_BIDIRECTIONAL);
+        put_page(dmatest_page);
+
         memset(mgp->rx_done.entry, 0, bytes);
 
         /* reset mcp/driver shared state back to 0 */