i40e: Ioremap changes

For future device support we do not want to map the whole CSR space since some
of it is mapped by other drivers with different mapping methods.

Note: As a side effect, the flash region (if exposed through the memory map)
gets unmapped too since it follows the future use region.

Change-ID: Ic729a2eacd692984220b1a415ff4fa0f98ea419a
Signed-off-by: Anjali Singhai Jain <anjali.singhai@intel.com>
Signed-off-by: Jesse Brandeburg <jesse.brandeburg@intel.com>
Tested-by: Jim Young <james.m.young@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>

2 files changed, 7 insertions, 2 deletions

diff --git a/drivers/net/ethernet/intel/i40e/i40e.h b/drivers/net/ethernet/intel/i40e/i40e.h
index c5137313b62a..ce3fbb87544e 100644
--- a/drivers/net/ethernet/intel/i40e/i40e.h
+++ b/drivers/net/ethernet/intel/i40e/i40e.h
@@ -72,6 +72,7 @@
 
 #define I40E_MAX_NUM_DESCRIPTORS      4096
 #define I40E_MAX_REGISTER     0x800000
+#define I40E_MAX_CSR_SPACE (4 * 1024 * 1024 - 64 * 1024)
 #define I40E_DEFAULT_NUM_DESCRIPTORS  512
 #define I40E_REQ_DESCRIPTOR_MULTIPLE  32
 #define I40E_MIN_NUM_DESCRIPTORS      64
diff --git a/drivers/net/ethernet/intel/i40e/i40e_main.c b/drivers/net/ethernet/intel/i40e/i40e_main.c
index 02b57c3aa4bb..f769005ea28c 100644
--- a/drivers/net/ethernet/intel/i40e/i40e_main.c
+++ b/drivers/net/ethernet/intel/i40e/i40e_main.c
@@ -9459,6 +9459,7 @@ static int i40e_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
         struct i40e_pf *pf;
         struct i40e_hw *hw;
         static u16 pfs_found;
+        u32 ioremap_len;
         u16 link_status;
         int err = 0;
         u32 len;
@@ -9507,8 +9508,11 @@ static int i40e_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 
         hw = &pf->hw;
         hw->back = pf;
-        hw->hw_addr = ioremap(pci_resource_start(pdev, 0),
-                              pci_resource_len(pdev, 0));
+
+        ioremap_len = min_t(int, pci_resource_len(pdev, 0),
+                            I40E_MAX_CSR_SPACE);
+
+        hw->hw_addr = ioremap(pci_resource_start(pdev, 0), ioremap_len);
         if (!hw->hw_addr) {
                 err = -EIO;
                 dev_info(&pdev->dev, "ioremap(0x%04x, 0x%04x) failed: 0x%x\n",