Improve mrpc efficiency by leveraging write combining

Previously, fill 1k mrpc input buffer took 1024 memwr tlps,
with each payload 1 dwords, while only 1 byte is valid(enabled).
In this case, too many of tlps within a timer windows introduce
tlp throttling.
By use of the write combining buffer,  1k data fillingtake 16
memwr tlps with each payload 16 dwords.

switchtec.c

@@ -126,6 +126,15 @@ static void stuser_set_state(struct switchtec_user *stuser,
 
 static void mrpc_complete_cmd(struct switchtec_dev *stdev);
 
+static void flush_wc_buf(struct switchtec_dev *stdev)
+{
+ struct ntb_dbmsg_regs __iomem *mmio_dbmsg;
+
+ mmio_dbmsg = (void __iomem *)stdev->mmio_ntb +
+ SWITCHTEC_NTB_REG_DBMSG_OFFSET;
+ ioread32(&mmio_dbmsg->reserved1[0]);
+}
+
 static void mrpc_cmd_submit(struct switchtec_dev *stdev)
 {
  /* requires the mrpc_mutex to already be held when called */
@@ -150,6 +159,7 @@ static void mrpc_cmd_submit(struct switchtec_dev *stdev)
  stdev->mrpc_busy = 1;
  memcpy_toio(&stdev->mmio_mrpc->input_data,
  stuser->data, stuser->data_len);
+ flush_wc_buf(stdev);
  iowrite32(stuser->cmd, &stdev->mmio_mrpc->cmd);
 
  schedule_delayed_work(&stdev->mrpc_timeout,
@@ -1310,23 +1320,38 @@ static int switchtec_init_pci(struct switchtec_dev *stdev,
  struct pci_dev *pdev)
 {
  int rc;
+ void __iomem *map;
+ unsigned long res_start, res_len;
 
  rc = pcim_enable_device(pdev);
  if (rc)
  return rc;
 
- rc = pcim_iomap_regions(pdev, 0x1, KBUILD_MODNAME);
- if (rc)
- return rc;
-
  rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
  if (rc)
  return rc;
 
  pci_set_master(pdev);
 
- stdev->mmio = pcim_iomap_table(pdev)[0];
- stdev->mmio_mrpc = stdev->mmio + SWITCHTEC_GAS_MRPC_OFFSET;
+ res_start = pci_resource_start(pdev, 0);
+ res_len = pci_resource_len(pdev, 0);
+
+ if (!devm_request_mem_region(&pdev->dev, res_start,
+ res_len, KBUILD_MODNAME))
+ return -EBUSY;
+
+ stdev->mmio_mrpc = devm_ioremap_wc(&pdev->dev, res_start,
+ SWITCHTEC_GAS_TOP_CFG_OFFSET);
+ if (!stdev->mmio_mrpc)
+ return -ENOMEM;
+
+ map = devm_ioremap(&pdev->dev,
+ res_start + SWITCHTEC_GAS_TOP_CFG_OFFSET,
+ res_len - SWITCHTEC_GAS_TOP_CFG_OFFSET);
+ if (!map)
+ return -ENOMEM;
+
+ stdev->mmio = map - SWITCHTEC_GAS_TOP_CFG_OFFSET;
  stdev->mmio_sw_event = stdev->mmio + SWITCHTEC_GAS_SW_EVENT_OFFSET;
  stdev->mmio_sys_info = stdev->mmio + SWITCHTEC_GAS_SYS_INFO_OFFSET;
  stdev->mmio_flash_info = stdev->mmio + SWITCHTEC_GAS_FLASH_INFO_OFFSET;