I/OAT: Add DCA services

Add code to connect to the DCA driver and provide cpu tags for use by
drivers that would like to use Direct Cache Access hints.

    [Adrian Bunk]                Several Kconfig cleanup items
    [Andrew Morten, Chris Leech] Fix for using cpu_physical_id() even when
			         built for uni-processor

Signed-off-by: Shannon Nelson <shannon.nelson@intel.com>
Acked-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 16 insertions, 1 deletions

diff --git a/drivers/dma/ioat.c b/drivers/dma/ioat.c
index ae5817bfc015..f7276bf2fe7e 100644
--- a/drivers/dma/ioat.c
+++ b/drivers/dma/ioat.c
@@ -1,6 +1,6 @@
 /*
  * Intel I/OAT DMA Linux driver
- * Copyright(c) 2004 - 2007 Intel Corporation.
+ * Copyright(c) 2007 Intel Corporation.
  *
  * This program is free software; you can redistribute it and/or modify it
  * under the terms and conditions of the GNU General Public License,
@@ -29,6 +29,7 @@
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/interrupt.h>
+#include <linux/dca.h>
 #include "ioatdma.h"
 #include "ioatdma_registers.h"
 #include "ioatdma_hw.h"
@@ -49,6 +50,7 @@ struct ioat_device {
         struct pci_dev          *pdev;
         void __iomem            *iobase;
         struct ioatdma_device   *dma;
+        struct dca_provider     *dca;
 };
 
 static int __devinit ioat_probe(struct pci_dev *pdev,
@@ -57,6 +59,10 @@ static int __devinit ioat_probe(struct pci_dev *pdev,
 static void __devexit ioat_remove(struct pci_dev *pdev);
 #endif
 
+static int ioat_dca_enabled = 1;
+module_param(ioat_dca_enabled, int, 0644);
+MODULE_PARM_DESC(ioat_dca_enabled, "control support of dca service (default: 1)");
+
 static int ioat_setup_functionality(struct pci_dev *pdev, void __iomem *iobase)
 {
         struct ioat_device *device = pci_get_drvdata(pdev);
@@ -67,6 +73,8 @@ static int ioat_setup_functionality(struct pci_dev *pdev, void __iomem *iobase)
         switch (version) {
         case IOAT_VER_1_2:
                 device->dma = ioat_dma_probe(pdev, iobase);
+                if (ioat_dca_enabled)
+                        device->dca = ioat_dca_init(pdev, iobase);
                 break;
         default:
                 err = -ENODEV;
@@ -83,6 +91,13 @@ static void ioat_shutdown_functionality(struct pci_dev *pdev)
                 ioat_dma_remove(device->dma);
                 device->dma = NULL;
         }
+
+        if (device->dca) {
+                unregister_dca_provider(device->dca);
+                free_dca_provider(device->dca);
+                device->dca = NULL;
+        }
+
 }
 
 static struct pci_driver ioat_pci_drv = {