drivers/dma/ioat/pci.c - kernel/msm-4.19 - Gitiles

 /*
  * Intel I/OAT DMA Linux driver
  * Copyright(c) 2007 - 2009 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,
  * version 2, as published by the Free Software Foundation.
  *
  * This program is distributed in the hope that it will be useful, but WITHOUT
  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
  * more details.
  *
  * The full GNU General Public License is included in this distribution in
  * the file called "COPYING".
  *
  */

 /*
  * This driver supports an Intel I/OAT DMA engine, which does asynchronous
  * copy operations.
  */

 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/interrupt.h>
 #include <linux/dca.h>
 #include <linux/slab.h>
 #include <linux/acpi.h>
 #include "dma.h"
 #include "registers.h"
 #include "hw.h"

 MODULE_VERSION(IOAT_DMA_VERSION);
 MODULE_LICENSE("Dual BSD/GPL");
 MODULE_AUTHOR("Intel Corporation");

 static struct pci_device_id ioat_pci_tbl[] = {
 	/* I/OAT v3 platforms */
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG0) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG1) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG2) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG3) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG4) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG5) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG6) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG7) },

 	/* I/OAT v3.2 platforms */
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF0) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF1) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF2) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF3) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF4) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF5) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF6) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF7) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF8) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF9) },

 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB0) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB1) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB2) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB3) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB4) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB5) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB6) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB7) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB8) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB9) },

 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB0) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB1) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB2) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB3) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB4) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB5) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB6) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB7) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB8) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB9) },

 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW0) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW1) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW2) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW3) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW4) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW5) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW6) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW7) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW8) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW9) },

 	/* I/OAT v3.3 platforms */
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD0) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD1) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD2) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD3) },

 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE0) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE1) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE2) },
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE3) },

 	{ 0, }
 };
 MODULE_DEVICE_TABLE(pci, ioat_pci_tbl);

 static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id);
 static void ioat_remove(struct pci_dev *pdev);

 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)");

 struct kmem_cache *ioat_cache;
 struct kmem_cache *ioat3_sed_cache;

 #define DRV_NAME "ioatdma"

 static struct pci_driver ioat_pci_driver = {
 	.name		= DRV_NAME,
 	.id_table	= ioat_pci_tbl,
 	.probe		= ioat_pci_probe,
 	.remove		= ioat_remove,
 };

 static struct ioatdma_device *
 alloc_ioatdma(struct pci_dev *pdev, void __iomem *iobase)
 {
 	struct device *dev = &pdev->dev;
 	struct ioatdma_device *d = devm_kzalloc(dev, sizeof(*d), GFP_KERNEL);

 	if (!d)
 		return NULL;
 	d->pdev = pdev;
 	d->reg_base = iobase;
 	return d;
 }

 /*
  * The dmaengine core assumes that async DMA devices will only be removed
  * when they not used anymore, or it assumes dma_async_device_unregister()
  * will only be called by dma driver exit routines. But this assumption is
  * not true for the IOAT driver, which calls dma_async_device_unregister()
  * from ioat_remove(). So current IOAT driver doesn't support device
  * hot-removal because it may cause system crash to hot-remove inuse IOAT
  * devices.
  *
  * This is a hack to disable IOAT devices under ejectable PCI host bridge
  * so it won't break PCI host bridge hot-removal.
  */
 static bool ioat_pci_has_ejectable_acpi_ancestor(struct pci_dev *pdev)
 {
 #ifdef CONFIG_ACPI
 	struct pci_bus *bus = pdev->bus;
 	struct acpi_device *adev;

 	while (bus->parent)
 		bus = bus->parent;
 	for (adev = ACPI_COMPANION(bus->bridge); adev; adev = adev->parent)
 		if (adev->flags.ejectable)
 			return true;
 #endif

 	return false;
 }

 static int ioat_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	void __iomem * const *iomap;
 	struct device *dev = &pdev->dev;
 	struct ioatdma_device *device;
 	int err;

 	if (ioat_pci_has_ejectable_acpi_ancestor(pdev)) {
 		dev_dbg(&pdev->dev, "ignore ejectable IOAT device.\n");
 		return -ENODEV;
 	}

 	err = pcim_enable_device(pdev);
 	if (err)
 		return err;

 	err = pcim_iomap_regions(pdev, 1 << IOAT_MMIO_BAR, DRV_NAME);
 	if (err)
 		return err;
 	iomap = pcim_iomap_table(pdev);
 	if (!iomap)
 		return -ENOMEM;

 	err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
 	if (err)
 		err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
 	if (err)
 		return err;

 	err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
 	if (err)
 		err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
 	if (err)
 		return err;

 	device = alloc_ioatdma(pdev, iomap[IOAT_MMIO_BAR]);
 	if (!device)
 		return -ENOMEM;
 	pci_set_master(pdev);
 	pci_set_drvdata(pdev, device);

 	device->version = readb(device->reg_base + IOAT_VER_OFFSET);
 	if (device->version >= IOAT_VER_3_0)
 		err = ioat3_dma_probe(device, ioat_dca_enabled);
 	else
 		return -ENODEV;

 	if (err) {
 		dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n");
 		return -ENODEV;
 	}

 	return 0;
 }

 static void ioat_remove(struct pci_dev *pdev)
 {
 	struct ioatdma_device *device = pci_get_drvdata(pdev);

 	if (!device)
 		return;

 	dev_err(&pdev->dev, "Removing dma and dca services\n");
 	if (device->dca) {
 		unregister_dca_provider(device->dca, &pdev->dev);
 		free_dca_provider(device->dca);
 		device->dca = NULL;
 	}
 	ioat_dma_remove(device);
 }

 static int __init ioat_init_module(void)
 {
 	int err = -ENOMEM;

 	pr_info("%s: Intel(R) QuickData Technology Driver %s\n",
 		DRV_NAME, IOAT_DMA_VERSION);

 	ioat_cache = kmem_cache_create("ioat", sizeof(struct ioat_ring_ent),
 					0, SLAB_HWCACHE_ALIGN, NULL);
 	if (!ioat_cache)
 		return -ENOMEM;

 	ioat3_sed_cache = KMEM_CACHE(ioat_sed_ent, 0);
 	if (!ioat3_sed_cache)
 		goto err_ioat_cache;

 	err = pci_register_driver(&ioat_pci_driver);
 	if (err)
 		goto err_ioat3_cache;

 	return 0;

  err_ioat3_cache:
 	kmem_cache_destroy(ioat3_sed_cache);

  err_ioat_cache:
 	kmem_cache_destroy(ioat_cache);

 	return err;
 }
 module_init(ioat_init_module);

 static void __exit ioat_exit_module(void)
 {
 	pci_unregister_driver(&ioat_pci_driver);
 	kmem_cache_destroy(ioat_cache);
 }
 module_exit(ioat_exit_module);
	/*
	* Intel I/OAT DMA Linux driver
	* Copyright(c) 2007 - 2009 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,
	* version 2, as published by the Free Software Foundation.
	*
	* This program is distributed in the hope that it will be useful, but WITHOUT
	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	* more details.
	*
	* The full GNU General Public License is included in this distribution in
	* the file called "COPYING".
	*
	*/

	/*
	* This driver supports an Intel I/OAT DMA engine, which does asynchronous
	* copy operations.
	*/

	#include <linux/init.h>
	#include <linux/module.h>
	#include <linux/pci.h>
	#include <linux/interrupt.h>
	#include <linux/dca.h>
	#include <linux/slab.h>
	#include <linux/acpi.h>
	#include "dma.h"
	#include "registers.h"
	#include "hw.h"

	MODULE_VERSION(IOAT_DMA_VERSION);
	MODULE_LICENSE("Dual BSD/GPL");
	MODULE_AUTHOR("Intel Corporation");

	static struct pci_device_id ioat_pci_tbl[] = {
	/* I/OAT v3 platforms */
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG0) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG1) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG2) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG3) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG4) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG5) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG6) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_TBG7) },

	/* I/OAT v3.2 platforms */
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF0) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF1) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF2) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF3) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF4) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF5) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF6) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF7) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF8) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_JSF9) },

	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB0) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB1) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB2) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB3) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB4) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB5) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB6) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB7) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB8) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_SNB9) },

	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB0) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB1) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB2) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB3) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB4) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB5) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB6) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB7) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB8) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_IVB9) },

	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW0) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW1) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW2) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW3) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW4) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW5) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW6) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW7) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW8) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_HSW9) },

	/* I/OAT v3.3 platforms */
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD0) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD1) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD2) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BWD3) },

	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE0) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE1) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE2) },
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_IOAT_BDXDE3) },

	{ 0, }
	};
	MODULE_DEVICE_TABLE(pci, ioat_pci_tbl);

	static int ioat_pci_probe(struct pci_dev pdev, const struct pci_device_id id);
	static void ioat_remove(struct pci_dev *pdev);

	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)");

	struct kmem_cache *ioat_cache;
	struct kmem_cache *ioat3_sed_cache;

	#define DRV_NAME "ioatdma"

	static struct pci_driver ioat_pci_driver = {
	.name = DRV_NAME,
	.id_table = ioat_pci_tbl,
	.probe = ioat_pci_probe,
	.remove = ioat_remove,
	};

	static struct ioatdma_device *
	alloc_ioatdma(struct pci_dev pdev, void __iomem iobase)
	{
	struct device *dev = &pdev->dev;
	struct ioatdma_device d = devm_kzalloc(dev, sizeof(d), GFP_KERNEL);

	if (!d)
	return NULL;
	d->pdev = pdev;
	d->reg_base = iobase;
	return d;
	}

	/*
	* The dmaengine core assumes that async DMA devices will only be removed
	* when they not used anymore, or it assumes dma_async_device_unregister()
	* will only be called by dma driver exit routines. But this assumption is
	* not true for the IOAT driver, which calls dma_async_device_unregister()
	* from ioat_remove(). So current IOAT driver doesn't support device
	* hot-removal because it may cause system crash to hot-remove inuse IOAT
	* devices.
	*
	* This is a hack to disable IOAT devices under ejectable PCI host bridge
	* so it won't break PCI host bridge hot-removal.
	*/
	static bool ioat_pci_has_ejectable_acpi_ancestor(struct pci_dev *pdev)
	{
	#ifdef CONFIG_ACPI
	struct pci_bus *bus = pdev->bus;
	struct acpi_device *adev;

	while (bus->parent)
	bus = bus->parent;
	for (adev = ACPI_COMPANION(bus->bridge); adev; adev = adev->parent)
	if (adev->flags.ejectable)
	return true;
	#endif

	return false;
	}

	static int ioat_pci_probe(struct pci_dev pdev, const struct pci_device_id id)
	{
	void __iomem * const *iomap;
	struct device *dev = &pdev->dev;
	struct ioatdma_device *device;
	int err;

	if (ioat_pci_has_ejectable_acpi_ancestor(pdev)) {
	dev_dbg(&pdev->dev, "ignore ejectable IOAT device.\n");
	return -ENODEV;
	}

	err = pcim_enable_device(pdev);
	if (err)
	return err;

	err = pcim_iomap_regions(pdev, 1 << IOAT_MMIO_BAR, DRV_NAME);
	if (err)
	return err;
	iomap = pcim_iomap_table(pdev);
	if (!iomap)
	return -ENOMEM;

	err = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
	if (err)
	err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
	if (err)
	return err;

	err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(64));
	if (err)
	err = pci_set_consistent_dma_mask(pdev, DMA_BIT_MASK(32));
	if (err)
	return err;

	device = alloc_ioatdma(pdev, iomap[IOAT_MMIO_BAR]);
	if (!device)
	return -ENOMEM;
	pci_set_master(pdev);
	pci_set_drvdata(pdev, device);

	device->version = readb(device->reg_base + IOAT_VER_OFFSET);
	if (device->version >= IOAT_VER_3_0)
	err = ioat3_dma_probe(device, ioat_dca_enabled);
	else
	return -ENODEV;

	if (err) {
	dev_err(dev, "Intel(R) I/OAT DMA Engine init failed\n");
	return -ENODEV;
	}

	return 0;
	}

	static void ioat_remove(struct pci_dev *pdev)
	{
	struct ioatdma_device *device = pci_get_drvdata(pdev);

	if (!device)
	return;

	dev_err(&pdev->dev, "Removing dma and dca services\n");
	if (device->dca) {
	unregister_dca_provider(device->dca, &pdev->dev);
	free_dca_provider(device->dca);
	device->dca = NULL;
	}
	ioat_dma_remove(device);
	}

	static int __init ioat_init_module(void)
	{
	int err = -ENOMEM;

	pr_info("%s: Intel(R) QuickData Technology Driver %s\n",
	DRV_NAME, IOAT_DMA_VERSION);

	ioat_cache = kmem_cache_create("ioat", sizeof(struct ioat_ring_ent),
	0, SLAB_HWCACHE_ALIGN, NULL);
	if (!ioat_cache)
	return -ENOMEM;

	ioat3_sed_cache = KMEM_CACHE(ioat_sed_ent, 0);
	if (!ioat3_sed_cache)
	goto err_ioat_cache;

	err = pci_register_driver(&ioat_pci_driver);
	if (err)
	goto err_ioat3_cache;

	return 0;

	err_ioat3_cache:
	kmem_cache_destroy(ioat3_sed_cache);

	err_ioat_cache:
	kmem_cache_destroy(ioat_cache);

	return err;
	}
	module_init(ioat_init_module);

	static void __exit ioat_exit_module(void)
	{
	pci_unregister_driver(&ioat_pci_driver);
	kmem_cache_destroy(ioat_cache);
	}
	module_exit(ioat_exit_module);