[Xen-devel] [PATCH v1 21/47] ethernet: myri10ge: use arch_phys_wc_add()

["Luis R. Rodriguez" <mcgrof@xxxxxxxxxxxxxxxx>]

From: "Luis R. Rodriguez" <mcgrof@xxxxxxxx>

This driver already uses ioremap_wc() on the same range
so when write-combining is available that will be used
instead.

Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Suresh Siddha <suresh.b.siddha@xxxxxxxxx>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Juergen Gross <jgross@xxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Hyong-Youb Kim <hykim@xxxxxxxx>
Cc: netdev@xxxxxxxxxxxxxxx
Cc: Juergen Gross <jgross@xxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Dave Airlie <airlied@xxxxxxxxxx>
Cc: Antonino Daplas <adaplas@xxxxxxxxx>
Cc: Jean-Christophe Plagniol-Villard <plagnioj@xxxxxxxxxxxx>
Cc: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
Cc: linux-kernel@xxxxxxxxxxxxxxx
Signed-off-by: Luis R. Rodriguez <mcgrof@xxxxxxxx>
---
 drivers/net/ethernet/myricom/myri10ge/myri10ge.c | 36 ++++++------------------
 1 file changed, 8 insertions(+), 28 deletions(-)

diff --git a/drivers/net/ethernet/myricom/myri10ge/myri10ge.c 
b/drivers/net/ethernet/myricom/myri10ge/myri10ge.c
index 1412f5a..01e4069 100644
--- a/drivers/net/ethernet/myricom/myri10ge/myri10ge.c
+++ b/drivers/net/ethernet/myricom/myri10ge/myri10ge.c
@@ -69,11 +69,7 @@
 #include <net/ip.h>
 #include <net/tcp.h>
 #include <asm/byteorder.h>
-#include <asm/io.h>
 #include <asm/processor.h>
-#ifdef CONFIG_MTRR
-#include <asm/mtrr.h>
-#endif
 #include <net/busy_poll.h>
 
 #include "myri10ge_mcp.h"
@@ -242,8 +238,7 @@ struct myri10ge_priv {
        unsigned int rdma_tags_available;
        int intr_coal_delay;
        __be32 __iomem *intr_coal_delay_ptr;
-       int mtrr;
-       int wc_enabled;
+       int wc_cookie;
        int down_cnt;
        wait_queue_head_t down_wq;
        struct work_struct watchdog_work;
@@ -1984,7 +1979,6 @@ myri10ge_get_ethtool_stats(struct net_device *netdev,
                data[i] = ((u64 *)&link_stats)[i];
 
        data[i++] = (unsigned int)mgp->tx_boundary;
-       data[i++] = (unsigned int)mgp->wc_enabled;
        data[i++] = (unsigned int)mgp->pdev->irq;
        data[i++] = (unsigned int)mgp->msi_enabled;
        data[i++] = (unsigned int)mgp->msix_enabled;
@@ -4040,14 +4034,7 @@ static int myri10ge_probe(struct pci_dev *pdev, const 
struct pci_device_id *ent)
 
        mgp->board_span = pci_resource_len(pdev, 0);
        mgp->iomem_base = pci_resource_start(pdev, 0);
-       mgp->mtrr = -1;
-       mgp->wc_enabled = 0;
-#ifdef CONFIG_MTRR
-       mgp->mtrr = mtrr_add(mgp->iomem_base, mgp->board_span,
-                            MTRR_TYPE_WRCOMB, 1);
-       if (mgp->mtrr >= 0)
-               mgp->wc_enabled = 1;
-#endif
+       mgp->wc_cookie = arch_phys_wc_add(mgp->iomem_base, mgp->board_span);
        mgp->sram = ioremap_wc(mgp->iomem_base, mgp->board_span);
        if (mgp->sram == NULL) {
                dev_err(&pdev->dev, "ioremap failed for %ld bytes at 0x%lx\n",
@@ -4146,14 +4133,14 @@ static int myri10ge_probe(struct pci_dev *pdev, const 
struct pci_device_id *ent)
                goto abort_with_state;
        }
        if (mgp->msix_enabled)
-               dev_info(dev, "%d MSI-X IRQs, tx bndry %d, fw %s, WC %s\n",
+               dev_info(dev, "%d MSI-X IRQs, tx bndry %d, fw %s, MTRR %s, WC 
Enabled\n",
                         mgp->num_slices, mgp->tx_boundary, mgp->fw_name,
-                        (mgp->wc_enabled ? "Enabled" : "Disabled"));
+                        (mgp->wc_cookie > 0 ? "Enabled" : "Disabled"));
        else
-               dev_info(dev, "%s IRQ %d, tx bndry %d, fw %s, WC %s\n",
+               dev_info(dev, "%s IRQ %d, tx bndry %d, fw %s, MTRR %s, WC 
Enabled\n",
                         mgp->msi_enabled ? "MSI" : "xPIC",
                         pdev->irq, mgp->tx_boundary, mgp->fw_name,
-                        (mgp->wc_enabled ? "Enabled" : "Disabled"));
+                        (mgp->wc_cookie > 0 ? "Enabled" : "Disabled"));
 
        board_number++;
        return 0;
@@ -4175,10 +4162,7 @@ abort_with_ioremap:
        iounmap(mgp->sram);
 
 abort_with_mtrr:
-#ifdef CONFIG_MTRR
-       if (mgp->mtrr >= 0)
-               mtrr_del(mgp->mtrr, mgp->iomem_base, mgp->board_span);
-#endif
+       arch_phys_wc_del(mgp->wc_cookie);
        dma_free_coherent(&pdev->dev, sizeof(*mgp->cmd),
                          mgp->cmd, mgp->cmd_bus);
 
@@ -4220,11 +4204,7 @@ static void myri10ge_remove(struct pci_dev *pdev)
        pci_restore_state(pdev);
 
        iounmap(mgp->sram);
-
-#ifdef CONFIG_MTRR
-       if (mgp->mtrr >= 0)
-               mtrr_del(mgp->mtrr, mgp->iomem_base, mgp->board_span);
-#endif
+       arch_phys_wc_del(mgp->wc_cookie);
        myri10ge_free_slices(mgp);
        kfree(mgp->msix_vectors);
        dma_free_coherent(&pdev->dev, sizeof(*mgp->cmd),
-- 
2.3.2.209.gd67f9d5.dirty


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