drivers/dma/idxd/init.c - linux - Git at Google

 // SPDX-License-Identifier: GPL-2.0
 /* Copyright(c) 2019 Intel Corporation. All rights rsvd. */
 #include <linux/init.h>
 #include <linux/kernel.h>
 #include <linux/module.h>
 #include <linux/slab.h>
 #include <linux/pci.h>
 #include <linux/interrupt.h>
 #include <linux/delay.h>
 #include <linux/dma-mapping.h>
 #include <linux/workqueue.h>
 #include <linux/aer.h>
 #include <linux/fs.h>
 #include <linux/io-64-nonatomic-lo-hi.h>
 #include <linux/device.h>
 #include <linux/idr.h>
 #include <uapi/linux/idxd.h>
 #include <linux/dmaengine.h>
 #include "../dmaengine.h"
 #include "registers.h"
 #include "idxd.h"

 MODULE_VERSION(IDXD_DRIVER_VERSION);
 MODULE_LICENSE("GPL v2");
 MODULE_AUTHOR("Intel Corporation");

 #define DRV_NAME "idxd"

 static struct idr idxd_idrs[IDXD_TYPE_MAX];
 static struct mutex idxd_idr_lock;

 static struct pci_device_id idxd_pci_tbl[] = {
 	/* DSA ver 1.0 platforms */
 	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_DSA_SPR0) },
 	{ 0, }
 };
 MODULE_DEVICE_TABLE(pci, idxd_pci_tbl);

 static char *idxd_name[] = {
 	"dsa",
 };

 const char *idxd_get_dev_name(struct idxd_device *idxd)
 {
 	return idxd_name[idxd->type];
 }

 static int idxd_setup_interrupts(struct idxd_device *idxd)
 {
 	struct pci_dev *pdev = idxd->pdev;
 	struct device *dev = &pdev->dev;
 	struct msix_entry *msix;
 	struct idxd_irq_entry *irq_entry;
 	int i, msixcnt;
 	int rc = 0;

 	msixcnt = pci_msix_vec_count(pdev);
 	if (msixcnt < 0) {
 		dev_err(dev, "Not MSI-X interrupt capable.\n");
 		goto err_no_irq;
 	}

 	idxd->msix_entries = devm_kzalloc(dev, sizeof(struct msix_entry) *
 			msixcnt, GFP_KERNEL);
 	if (!idxd->msix_entries) {
 		rc = -ENOMEM;
 		goto err_no_irq;
 	}

 	for (i = 0; i < msixcnt; i++)
 		idxd->msix_entries[i].entry = i;

 	rc = pci_enable_msix_exact(pdev, idxd->msix_entries, msixcnt);
 	if (rc) {
 		dev_err(dev, "Failed enabling %d MSIX entries.\n", msixcnt);
 		goto err_no_irq;
 	}
 	dev_dbg(dev, "Enabled %d msix vectors\n", msixcnt);

 	/*
 	 * We implement 1 completion list per MSI-X entry except for
 	 * entry 0, which is for errors and others.
 	 */
 	idxd->irq_entries = devm_kcalloc(dev, msixcnt,
 					 sizeof(struct idxd_irq_entry),
 					 GFP_KERNEL);
 	if (!idxd->irq_entries) {
 		rc = -ENOMEM;
 		goto err_no_irq;
 	}

 	for (i = 0; i < msixcnt; i++) {
 		idxd->irq_entries[i].id = i;
 		idxd->irq_entries[i].idxd = idxd;
 	}

 	msix = &idxd->msix_entries[0];
 	irq_entry = &idxd->irq_entries[0];
 	rc = devm_request_threaded_irq(dev, msix->vector, idxd_irq_handler,
 				       idxd_misc_thread, 0, "idxd-misc",
 				       irq_entry);
 	if (rc < 0) {
 		dev_err(dev, "Failed to allocate misc interrupt.\n");
 		goto err_no_irq;
 	}

 	dev_dbg(dev, "Allocated idxd-misc handler on msix vector %d\n",
 		msix->vector);

 	/* first MSI-X entry is not for wq interrupts */
 	idxd->num_wq_irqs = msixcnt - 1;

 	for (i = 1; i < msixcnt; i++) {
 		msix = &idxd->msix_entries[i];
 		irq_entry = &idxd->irq_entries[i];

 		init_llist_head(&idxd->irq_entries[i].pending_llist);
 		INIT_LIST_HEAD(&idxd->irq_entries[i].work_list);
 		rc = devm_request_threaded_irq(dev, msix->vector,
 					       idxd_irq_handler,
 					       idxd_wq_thread, 0,
 					       "idxd-portal", irq_entry);
 		if (rc < 0) {
 			dev_err(dev, "Failed to allocate irq %d.\n",
 				msix->vector);
 			goto err_no_irq;
 		}
 		dev_dbg(dev, "Allocated idxd-msix %d for vector %d\n",
 			i, msix->vector);
 	}

 	idxd_unmask_error_interrupts(idxd);

 	return 0;

  err_no_irq:
 	/* Disable error interrupt generation */
 	idxd_mask_error_interrupts(idxd);
 	pci_disable_msix(pdev);
 	dev_err(dev, "No usable interrupts\n");
 	return rc;
 }

 static int idxd_setup_internals(struct idxd_device *idxd)
 {
 	struct device *dev = &idxd->pdev->dev;
 	int i;

 	init_waitqueue_head(&idxd->cmd_waitq);
 	idxd->groups = devm_kcalloc(dev, idxd->max_groups,
 				    sizeof(struct idxd_group), GFP_KERNEL);
 	if (!idxd->groups)
 		return -ENOMEM;

 	for (i = 0; i < idxd->max_groups; i++) {
 		idxd->groups[i].idxd = idxd;
 		idxd->groups[i].id = i;
 		idxd->groups[i].tc_a = -1;
 		idxd->groups[i].tc_b = -1;
 	}

 	idxd->wqs = devm_kcalloc(dev, idxd->max_wqs, sizeof(struct idxd_wq),
 				 GFP_KERNEL);
 	if (!idxd->wqs)
 		return -ENOMEM;

 	idxd->engines = devm_kcalloc(dev, idxd->max_engines,
 				     sizeof(struct idxd_engine), GFP_KERNEL);
 	if (!idxd->engines)
 		return -ENOMEM;

 	for (i = 0; i < idxd->max_wqs; i++) {
 		struct idxd_wq *wq = &idxd->wqs[i];

 		wq->id = i;
 		wq->idxd = idxd;
 		mutex_init(&wq->wq_lock);
 		wq->idxd_cdev.minor = -1;
 	}

 	for (i = 0; i < idxd->max_engines; i++) {
 		idxd->engines[i].idxd = idxd;
 		idxd->engines[i].id = i;
 	}

 	idxd->wq = create_workqueue(dev_name(dev));
 	if (!idxd->wq)
 		return -ENOMEM;

 	return 0;
 }

 static void idxd_read_table_offsets(struct idxd_device *idxd)
 {
 	union offsets_reg offsets;
 	struct device *dev = &idxd->pdev->dev;

 	offsets.bits[0] = ioread64(idxd->reg_base + IDXD_TABLE_OFFSET);
 	offsets.bits[1] = ioread64(idxd->reg_base + IDXD_TABLE_OFFSET
 			+ sizeof(u64));
 	idxd->grpcfg_offset = offsets.grpcfg * 0x100;
 	dev_dbg(dev, "IDXD Group Config Offset: %#x\n", idxd->grpcfg_offset);
 	idxd->wqcfg_offset = offsets.wqcfg * 0x100;
 	dev_dbg(dev, "IDXD Work Queue Config Offset: %#x\n",
 		idxd->wqcfg_offset);
 	idxd->msix_perm_offset = offsets.msix_perm * 0x100;
 	dev_dbg(dev, "IDXD MSIX Permission Offset: %#x\n",
 		idxd->msix_perm_offset);
 	idxd->perfmon_offset = offsets.perfmon * 0x100;
 	dev_dbg(dev, "IDXD Perfmon Offset: %#x\n", idxd->perfmon_offset);
 }

 static void idxd_read_caps(struct idxd_device *idxd)
 {
 	struct device *dev = &idxd->pdev->dev;
 	int i;

 	/* reading generic capabilities */
 	idxd->hw.gen_cap.bits = ioread64(idxd->reg_base + IDXD_GENCAP_OFFSET);
 	dev_dbg(dev, "gen_cap: %#llx\n", idxd->hw.gen_cap.bits);
 	idxd->max_xfer_bytes = 1ULL << idxd->hw.gen_cap.max_xfer_shift;
 	dev_dbg(dev, "max xfer size: %llu bytes\n", idxd->max_xfer_bytes);
 	idxd->max_batch_size = 1U << idxd->hw.gen_cap.max_batch_shift;
 	dev_dbg(dev, "max batch size: %u\n", idxd->max_batch_size);
 	if (idxd->hw.gen_cap.config_en)
 		set_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags);

 	/* reading group capabilities */
 	idxd->hw.group_cap.bits =
 		ioread64(idxd->reg_base + IDXD_GRPCAP_OFFSET);
 	dev_dbg(dev, "group_cap: %#llx\n", idxd->hw.group_cap.bits);
 	idxd->max_groups = idxd->hw.group_cap.num_groups;
 	dev_dbg(dev, "max groups: %u\n", idxd->max_groups);
 	idxd->max_tokens = idxd->hw.group_cap.total_tokens;
 	dev_dbg(dev, "max tokens: %u\n", idxd->max_tokens);
 	idxd->nr_tokens = idxd->max_tokens;

 	/* read engine capabilities */
 	idxd->hw.engine_cap.bits =
 		ioread64(idxd->reg_base + IDXD_ENGCAP_OFFSET);
 	dev_dbg(dev, "engine_cap: %#llx\n", idxd->hw.engine_cap.bits);
 	idxd->max_engines = idxd->hw.engine_cap.num_engines;
 	dev_dbg(dev, "max engines: %u\n", idxd->max_engines);

 	/* read workqueue capabilities */
 	idxd->hw.wq_cap.bits = ioread64(idxd->reg_base + IDXD_WQCAP_OFFSET);
 	dev_dbg(dev, "wq_cap: %#llx\n", idxd->hw.wq_cap.bits);
 	idxd->max_wq_size = idxd->hw.wq_cap.total_wq_size;
 	dev_dbg(dev, "total workqueue size: %u\n", idxd->max_wq_size);
 	idxd->max_wqs = idxd->hw.wq_cap.num_wqs;
 	dev_dbg(dev, "max workqueues: %u\n", idxd->max_wqs);

 	/* reading operation capabilities */
 	for (i = 0; i < 4; i++) {
 		idxd->hw.opcap.bits[i] = ioread64(idxd->reg_base +
 				IDXD_OPCAP_OFFSET + i * sizeof(u64));
 		dev_dbg(dev, "opcap[%d]: %#llx\n", i, idxd->hw.opcap.bits[i]);
 	}
 }

 static struct idxd_device *idxd_alloc(struct pci_dev *pdev,
 				      void __iomem * const *iomap)
 {
 	struct device *dev = &pdev->dev;
 	struct idxd_device *idxd;

 	idxd = devm_kzalloc(dev, sizeof(struct idxd_device), GFP_KERNEL);
 	if (!idxd)
 		return NULL;

 	idxd->pdev = pdev;
 	idxd->reg_base = iomap[IDXD_MMIO_BAR];
 	spin_lock_init(&idxd->dev_lock);

 	return idxd;
 }

 static int idxd_probe(struct idxd_device *idxd)
 {
 	struct pci_dev *pdev = idxd->pdev;
 	struct device *dev = &pdev->dev;
 	int rc;

 	dev_dbg(dev, "%s entered and resetting device\n", __func__);
 	idxd_device_init_reset(idxd);
 	dev_dbg(dev, "IDXD reset complete\n");

 	idxd_read_caps(idxd);
 	idxd_read_table_offsets(idxd);

 	rc = idxd_setup_internals(idxd);
 	if (rc)
 		goto err_setup;

 	rc = idxd_setup_interrupts(idxd);
 	if (rc)
 		goto err_setup;

 	dev_dbg(dev, "IDXD interrupt setup complete.\n");

 	mutex_lock(&idxd_idr_lock);
 	idxd->id = idr_alloc(&idxd_idrs[idxd->type], idxd, 0, 0, GFP_KERNEL);
 	mutex_unlock(&idxd_idr_lock);
 	if (idxd->id < 0) {
 		rc = -ENOMEM;
 		goto err_idr_fail;
 	}

 	idxd->major = idxd_cdev_get_major(idxd);

 	dev_dbg(dev, "IDXD device %d probed successfully\n", idxd->id);
 	return 0;

  err_idr_fail:
 	idxd_mask_error_interrupts(idxd);
 	idxd_mask_msix_vectors(idxd);
  err_setup:
 	return rc;
 }

 static int idxd_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 {
 	void __iomem * const *iomap;
 	struct device *dev = &pdev->dev;
 	struct idxd_device *idxd;
 	int rc;
 	unsigned int mask;

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

 	dev_dbg(dev, "Mapping BARs\n");
 	mask = (1 << IDXD_MMIO_BAR);
 	rc = pcim_iomap_regions(pdev, mask, DRV_NAME);
 	if (rc)
 		return rc;

 	iomap = pcim_iomap_table(pdev);
 	if (!iomap)
 		return -ENOMEM;

 	dev_dbg(dev, "Set DMA masks\n");
 	rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
 	if (rc)
 		rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
 	if (rc)
 		return rc;

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

 	dev_dbg(dev, "Alloc IDXD context\n");
 	idxd = idxd_alloc(pdev, iomap);
 	if (!idxd)
 		return -ENOMEM;

 	idxd_set_type(idxd);

 	dev_dbg(dev, "Set PCI master\n");
 	pci_set_master(pdev);
 	pci_set_drvdata(pdev, idxd);

 	idxd->hw.version = ioread32(idxd->reg_base + IDXD_VER_OFFSET);
 	rc = idxd_probe(idxd);
 	if (rc) {
 		dev_err(dev, "Intel(R) IDXD DMA Engine init failed\n");
 		return -ENODEV;
 	}

 	rc = idxd_setup_sysfs(idxd);
 	if (rc) {
 		dev_err(dev, "IDXD sysfs setup failed\n");
 		return -ENODEV;
 	}

 	idxd->state = IDXD_DEV_CONF_READY;

 	dev_info(&pdev->dev, "Intel(R) Accelerator Device (v%x)\n",
 		 idxd->hw.version);

 	return 0;
 }

 static void idxd_flush_pending_llist(struct idxd_irq_entry *ie)
 {
 	struct idxd_desc *desc, *itr;
 	struct llist_node *head;

 	head = llist_del_all(&ie->pending_llist);
 	if (!head)
 		return;

 	llist_for_each_entry_safe(desc, itr, head, llnode) {
 		idxd_dma_complete_txd(desc, IDXD_COMPLETE_ABORT);
 		idxd_free_desc(desc->wq, desc);
 	}
 }

 static void idxd_flush_work_list(struct idxd_irq_entry *ie)
 {
 	struct idxd_desc *desc, *iter;

 	list_for_each_entry_safe(desc, iter, &ie->work_list, list) {
 		list_del(&desc->list);
 		idxd_dma_complete_txd(desc, IDXD_COMPLETE_ABORT);
 		idxd_free_desc(desc->wq, desc);
 	}
 }

 static void idxd_shutdown(struct pci_dev *pdev)
 {
 	struct idxd_device *idxd = pci_get_drvdata(pdev);
 	int rc, i;
 	struct idxd_irq_entry *irq_entry;
 	int msixcnt = pci_msix_vec_count(pdev);

 	rc = idxd_device_disable(idxd);
 	if (rc)
 		dev_err(&pdev->dev, "Disabling device failed\n");

 	dev_dbg(&pdev->dev, "%s called\n", __func__);
 	idxd_mask_msix_vectors(idxd);
 	idxd_mask_error_interrupts(idxd);

 	for (i = 0; i < msixcnt; i++) {
 		irq_entry = &idxd->irq_entries[i];
 		synchronize_irq(idxd->msix_entries[i].vector);
 		if (i == 0)
 			continue;
 		idxd_flush_pending_llist(irq_entry);
 		idxd_flush_work_list(irq_entry);
 	}

 	destroy_workqueue(idxd->wq);
 }

 static void idxd_remove(struct pci_dev *pdev)
 {
 	struct idxd_device *idxd = pci_get_drvdata(pdev);

 	dev_dbg(&pdev->dev, "%s called\n", __func__);
 	idxd_cleanup_sysfs(idxd);
 	idxd_shutdown(pdev);
 	mutex_lock(&idxd_idr_lock);
 	idr_remove(&idxd_idrs[idxd->type], idxd->id);
 	mutex_unlock(&idxd_idr_lock);
 }

 static struct pci_driver idxd_pci_driver = {
 	.name		= DRV_NAME,
 	.id_table	= idxd_pci_tbl,
 	.probe		= idxd_pci_probe,
 	.remove		= idxd_remove,
 	.shutdown	= idxd_shutdown,
 };

 static int __init idxd_init_module(void)
 {
 	int err, i;

 	/*
 	 * If the CPU does not support write512, there's no point in
 	 * enumerating the device. We can not utilize it.
 	 */
 	if (!boot_cpu_has(X86_FEATURE_MOVDIR64B)) {
 		pr_warn("idxd driver failed to load without MOVDIR64B.\n");
 		return -ENODEV;
 	}

 	pr_info("%s: Intel(R) Accelerator Devices Driver %s\n",
 		DRV_NAME, IDXD_DRIVER_VERSION);

 	mutex_init(&idxd_idr_lock);
 	for (i = 0; i < IDXD_TYPE_MAX; i++)
 		idr_init(&idxd_idrs[i]);

 	err = idxd_register_bus_type();
 	if (err < 0)
 		return err;

 	err = idxd_register_driver();
 	if (err < 0)
 		goto err_idxd_driver_register;

 	err = idxd_cdev_register();
 	if (err)
 		goto err_cdev_register;

 	err = pci_register_driver(&idxd_pci_driver);
 	if (err)
 		goto err_pci_register;

 	return 0;

 err_pci_register:
 	idxd_cdev_remove();
 err_cdev_register:
 	idxd_unregister_driver();
 err_idxd_driver_register:
 	idxd_unregister_bus_type();
 	return err;
 }
 module_init(idxd_init_module);

 static void __exit idxd_exit_module(void)
 {
 	pci_unregister_driver(&idxd_pci_driver);
 	idxd_cdev_remove();
 	idxd_unregister_bus_type();
 }
 module_exit(idxd_exit_module);
	// SPDX-License-Identifier: GPL-2.0
	/* Copyright(c) 2019 Intel Corporation. All rights rsvd. */
	#include <linux/init.h>
	#include <linux/kernel.h>
	#include <linux/module.h>
	#include <linux/slab.h>
	#include <linux/pci.h>
	#include <linux/interrupt.h>
	#include <linux/delay.h>
	#include <linux/dma-mapping.h>
	#include <linux/workqueue.h>
	#include <linux/aer.h>
	#include <linux/fs.h>
	#include <linux/io-64-nonatomic-lo-hi.h>
	#include <linux/device.h>
	#include <linux/idr.h>
	#include <uapi/linux/idxd.h>
	#include <linux/dmaengine.h>
	#include "../dmaengine.h"
	#include "registers.h"
	#include "idxd.h"

	MODULE_VERSION(IDXD_DRIVER_VERSION);
	MODULE_LICENSE("GPL v2");
	MODULE_AUTHOR("Intel Corporation");

	#define DRV_NAME "idxd"

	static struct idr idxd_idrs[IDXD_TYPE_MAX];
	static struct mutex idxd_idr_lock;

	static struct pci_device_id idxd_pci_tbl[] = {
	/* DSA ver 1.0 platforms */
	{ PCI_VDEVICE(INTEL, PCI_DEVICE_ID_INTEL_DSA_SPR0) },
	{ 0, }
	};
	MODULE_DEVICE_TABLE(pci, idxd_pci_tbl);

	static char *idxd_name[] = {
	"dsa",
	};

	const char idxd_get_dev_name(struct idxd_device idxd)
	{
	return idxd_name[idxd->type];
	}

	static int idxd_setup_interrupts(struct idxd_device *idxd)
	{
	struct pci_dev *pdev = idxd->pdev;
	struct device *dev = &pdev->dev;
	struct msix_entry *msix;
	struct idxd_irq_entry *irq_entry;
	int i, msixcnt;
	int rc = 0;

	msixcnt = pci_msix_vec_count(pdev);
	if (msixcnt < 0) {
	dev_err(dev, "Not MSI-X interrupt capable.\n");
	goto err_no_irq;
	}

	idxd->msix_entries = devm_kzalloc(dev, sizeof(struct msix_entry) *
	msixcnt, GFP_KERNEL);
	if (!idxd->msix_entries) {
	rc = -ENOMEM;
	goto err_no_irq;
	}

	for (i = 0; i < msixcnt; i++)
	idxd->msix_entries[i].entry = i;

	rc = pci_enable_msix_exact(pdev, idxd->msix_entries, msixcnt);
	if (rc) {
	dev_err(dev, "Failed enabling %d MSIX entries.\n", msixcnt);
	goto err_no_irq;
	}
	dev_dbg(dev, "Enabled %d msix vectors\n", msixcnt);

	/*
	* We implement 1 completion list per MSI-X entry except for
	* entry 0, which is for errors and others.
	*/
	idxd->irq_entries = devm_kcalloc(dev, msixcnt,
	sizeof(struct idxd_irq_entry),
	GFP_KERNEL);
	if (!idxd->irq_entries) {
	rc = -ENOMEM;
	goto err_no_irq;
	}

	for (i = 0; i < msixcnt; i++) {
	idxd->irq_entries[i].id = i;
	idxd->irq_entries[i].idxd = idxd;
	}

	msix = &idxd->msix_entries[0];
	irq_entry = &idxd->irq_entries[0];
	rc = devm_request_threaded_irq(dev, msix->vector, idxd_irq_handler,
	idxd_misc_thread, 0, "idxd-misc",
	irq_entry);
	if (rc < 0) {
	dev_err(dev, "Failed to allocate misc interrupt.\n");
	goto err_no_irq;
	}

	dev_dbg(dev, "Allocated idxd-misc handler on msix vector %d\n",
	msix->vector);

	/* first MSI-X entry is not for wq interrupts */
	idxd->num_wq_irqs = msixcnt - 1;

	for (i = 1; i < msixcnt; i++) {
	msix = &idxd->msix_entries[i];
	irq_entry = &idxd->irq_entries[i];

	init_llist_head(&idxd->irq_entries[i].pending_llist);
	INIT_LIST_HEAD(&idxd->irq_entries[i].work_list);
	rc = devm_request_threaded_irq(dev, msix->vector,
	idxd_irq_handler,
	idxd_wq_thread, 0,
	"idxd-portal", irq_entry);
	if (rc < 0) {
	dev_err(dev, "Failed to allocate irq %d.\n",
	msix->vector);
	goto err_no_irq;
	}
	dev_dbg(dev, "Allocated idxd-msix %d for vector %d\n",
	i, msix->vector);
	}

	idxd_unmask_error_interrupts(idxd);

	return 0;

	err_no_irq:
	/* Disable error interrupt generation */
	idxd_mask_error_interrupts(idxd);
	pci_disable_msix(pdev);
	dev_err(dev, "No usable interrupts\n");
	return rc;
	}

	static int idxd_setup_internals(struct idxd_device *idxd)
	{
	struct device *dev = &idxd->pdev->dev;
	int i;

	init_waitqueue_head(&idxd->cmd_waitq);
	idxd->groups = devm_kcalloc(dev, idxd->max_groups,
	sizeof(struct idxd_group), GFP_KERNEL);
	if (!idxd->groups)
	return -ENOMEM;

	for (i = 0; i < idxd->max_groups; i++) {
	idxd->groups[i].idxd = idxd;
	idxd->groups[i].id = i;
	idxd->groups[i].tc_a = -1;
	idxd->groups[i].tc_b = -1;
	}

	idxd->wqs = devm_kcalloc(dev, idxd->max_wqs, sizeof(struct idxd_wq),
	GFP_KERNEL);
	if (!idxd->wqs)
	return -ENOMEM;

	idxd->engines = devm_kcalloc(dev, idxd->max_engines,
	sizeof(struct idxd_engine), GFP_KERNEL);
	if (!idxd->engines)
	return -ENOMEM;

	for (i = 0; i < idxd->max_wqs; i++) {
	struct idxd_wq *wq = &idxd->wqs[i];

	wq->id = i;
	wq->idxd = idxd;
	mutex_init(&wq->wq_lock);
	wq->idxd_cdev.minor = -1;
	}

	for (i = 0; i < idxd->max_engines; i++) {
	idxd->engines[i].idxd = idxd;
	idxd->engines[i].id = i;
	}

	idxd->wq = create_workqueue(dev_name(dev));
	if (!idxd->wq)
	return -ENOMEM;

	return 0;
	}

	static void idxd_read_table_offsets(struct idxd_device *idxd)
	{
	union offsets_reg offsets;
	struct device *dev = &idxd->pdev->dev;

	offsets.bits[0] = ioread64(idxd->reg_base + IDXD_TABLE_OFFSET);
	offsets.bits[1] = ioread64(idxd->reg_base + IDXD_TABLE_OFFSET
	+ sizeof(u64));
	idxd->grpcfg_offset = offsets.grpcfg * 0x100;
	dev_dbg(dev, "IDXD Group Config Offset: %#x\n", idxd->grpcfg_offset);
	idxd->wqcfg_offset = offsets.wqcfg * 0x100;
	dev_dbg(dev, "IDXD Work Queue Config Offset: %#x\n",
	idxd->wqcfg_offset);
	idxd->msix_perm_offset = offsets.msix_perm * 0x100;
	dev_dbg(dev, "IDXD MSIX Permission Offset: %#x\n",
	idxd->msix_perm_offset);
	idxd->perfmon_offset = offsets.perfmon * 0x100;
	dev_dbg(dev, "IDXD Perfmon Offset: %#x\n", idxd->perfmon_offset);
	}

	static void idxd_read_caps(struct idxd_device *idxd)
	{
	struct device *dev = &idxd->pdev->dev;
	int i;

	/* reading generic capabilities */
	idxd->hw.gen_cap.bits = ioread64(idxd->reg_base + IDXD_GENCAP_OFFSET);
	dev_dbg(dev, "gen_cap: %#llx\n", idxd->hw.gen_cap.bits);
	idxd->max_xfer_bytes = 1ULL << idxd->hw.gen_cap.max_xfer_shift;
	dev_dbg(dev, "max xfer size: %llu bytes\n", idxd->max_xfer_bytes);
	idxd->max_batch_size = 1U << idxd->hw.gen_cap.max_batch_shift;
	dev_dbg(dev, "max batch size: %u\n", idxd->max_batch_size);
	if (idxd->hw.gen_cap.config_en)
	set_bit(IDXD_FLAG_CONFIGURABLE, &idxd->flags);

	/* reading group capabilities */
	idxd->hw.group_cap.bits =
	ioread64(idxd->reg_base + IDXD_GRPCAP_OFFSET);
	dev_dbg(dev, "group_cap: %#llx\n", idxd->hw.group_cap.bits);
	idxd->max_groups = idxd->hw.group_cap.num_groups;
	dev_dbg(dev, "max groups: %u\n", idxd->max_groups);
	idxd->max_tokens = idxd->hw.group_cap.total_tokens;
	dev_dbg(dev, "max tokens: %u\n", idxd->max_tokens);
	idxd->nr_tokens = idxd->max_tokens;

	/* read engine capabilities */
	idxd->hw.engine_cap.bits =
	ioread64(idxd->reg_base + IDXD_ENGCAP_OFFSET);
	dev_dbg(dev, "engine_cap: %#llx\n", idxd->hw.engine_cap.bits);
	idxd->max_engines = idxd->hw.engine_cap.num_engines;
	dev_dbg(dev, "max engines: %u\n", idxd->max_engines);

	/* read workqueue capabilities */
	idxd->hw.wq_cap.bits = ioread64(idxd->reg_base + IDXD_WQCAP_OFFSET);
	dev_dbg(dev, "wq_cap: %#llx\n", idxd->hw.wq_cap.bits);
	idxd->max_wq_size = idxd->hw.wq_cap.total_wq_size;
	dev_dbg(dev, "total workqueue size: %u\n", idxd->max_wq_size);
	idxd->max_wqs = idxd->hw.wq_cap.num_wqs;
	dev_dbg(dev, "max workqueues: %u\n", idxd->max_wqs);

	/* reading operation capabilities */
	for (i = 0; i < 4; i++) {
	idxd->hw.opcap.bits[i] = ioread64(idxd->reg_base +
	IDXD_OPCAP_OFFSET + i * sizeof(u64));
	dev_dbg(dev, "opcap[%d]: %#llx\n", i, idxd->hw.opcap.bits[i]);
	}
	}

	static struct idxd_device idxd_alloc(struct pci_dev pdev,
	void __iomem * const *iomap)
	{
	struct device *dev = &pdev->dev;
	struct idxd_device *idxd;

	idxd = devm_kzalloc(dev, sizeof(struct idxd_device), GFP_KERNEL);
	if (!idxd)
	return NULL;

	idxd->pdev = pdev;
	idxd->reg_base = iomap[IDXD_MMIO_BAR];
	spin_lock_init(&idxd->dev_lock);

	return idxd;
	}

	static int idxd_probe(struct idxd_device *idxd)
	{
	struct pci_dev *pdev = idxd->pdev;
	struct device *dev = &pdev->dev;
	int rc;

	dev_dbg(dev, "%s entered and resetting device\n", __func__);
	idxd_device_init_reset(idxd);
	dev_dbg(dev, "IDXD reset complete\n");

	idxd_read_caps(idxd);
	idxd_read_table_offsets(idxd);

	rc = idxd_setup_internals(idxd);
	if (rc)
	goto err_setup;

	rc = idxd_setup_interrupts(idxd);
	if (rc)
	goto err_setup;

	dev_dbg(dev, "IDXD interrupt setup complete.\n");

	mutex_lock(&idxd_idr_lock);
	idxd->id = idr_alloc(&idxd_idrs[idxd->type], idxd, 0, 0, GFP_KERNEL);
	mutex_unlock(&idxd_idr_lock);
	if (idxd->id < 0) {
	rc = -ENOMEM;
	goto err_idr_fail;
	}

	idxd->major = idxd_cdev_get_major(idxd);

	dev_dbg(dev, "IDXD device %d probed successfully\n", idxd->id);
	return 0;

	err_idr_fail:
	idxd_mask_error_interrupts(idxd);
	idxd_mask_msix_vectors(idxd);
	err_setup:
	return rc;
	}

	static int idxd_pci_probe(struct pci_dev pdev, const struct pci_device_id id)
	{
	void __iomem * const *iomap;
	struct device *dev = &pdev->dev;
	struct idxd_device *idxd;
	int rc;
	unsigned int mask;

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

	dev_dbg(dev, "Mapping BARs\n");
	mask = (1 << IDXD_MMIO_BAR);
	rc = pcim_iomap_regions(pdev, mask, DRV_NAME);
	if (rc)
	return rc;

	iomap = pcim_iomap_table(pdev);
	if (!iomap)
	return -ENOMEM;

	dev_dbg(dev, "Set DMA masks\n");
	rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
	if (rc)
	rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
	if (rc)
	return rc;

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

	dev_dbg(dev, "Alloc IDXD context\n");
	idxd = idxd_alloc(pdev, iomap);
	if (!idxd)
	return -ENOMEM;

	idxd_set_type(idxd);

	dev_dbg(dev, "Set PCI master\n");
	pci_set_master(pdev);
	pci_set_drvdata(pdev, idxd);

	idxd->hw.version = ioread32(idxd->reg_base + IDXD_VER_OFFSET);
	rc = idxd_probe(idxd);
	if (rc) {
	dev_err(dev, "Intel(R) IDXD DMA Engine init failed\n");
	return -ENODEV;
	}

	rc = idxd_setup_sysfs(idxd);
	if (rc) {
	dev_err(dev, "IDXD sysfs setup failed\n");
	return -ENODEV;
	}

	idxd->state = IDXD_DEV_CONF_READY;

	dev_info(&pdev->dev, "Intel(R) Accelerator Device (v%x)\n",
	idxd->hw.version);

	return 0;
	}

	static void idxd_flush_pending_llist(struct idxd_irq_entry *ie)
	{
	struct idxd_desc desc, itr;
	struct llist_node *head;

	head = llist_del_all(&ie->pending_llist);
	if (!head)
	return;

	llist_for_each_entry_safe(desc, itr, head, llnode) {
	idxd_dma_complete_txd(desc, IDXD_COMPLETE_ABORT);
	idxd_free_desc(desc->wq, desc);
	}
	}

	static void idxd_flush_work_list(struct idxd_irq_entry *ie)
	{
	struct idxd_desc desc, iter;

	list_for_each_entry_safe(desc, iter, &ie->work_list, list) {
	list_del(&desc->list);
	idxd_dma_complete_txd(desc, IDXD_COMPLETE_ABORT);
	idxd_free_desc(desc->wq, desc);
	}
	}

	static void idxd_shutdown(struct pci_dev *pdev)
	{
	struct idxd_device *idxd = pci_get_drvdata(pdev);
	int rc, i;
	struct idxd_irq_entry *irq_entry;
	int msixcnt = pci_msix_vec_count(pdev);

	rc = idxd_device_disable(idxd);
	if (rc)
	dev_err(&pdev->dev, "Disabling device failed\n");

	dev_dbg(&pdev->dev, "%s called\n", __func__);
	idxd_mask_msix_vectors(idxd);
	idxd_mask_error_interrupts(idxd);

	for (i = 0; i < msixcnt; i++) {
	irq_entry = &idxd->irq_entries[i];
	synchronize_irq(idxd->msix_entries[i].vector);
	if (i == 0)
	continue;
	idxd_flush_pending_llist(irq_entry);
	idxd_flush_work_list(irq_entry);
	}

	destroy_workqueue(idxd->wq);
	}

	static void idxd_remove(struct pci_dev *pdev)
	{
	struct idxd_device *idxd = pci_get_drvdata(pdev);

	dev_dbg(&pdev->dev, "%s called\n", __func__);
	idxd_cleanup_sysfs(idxd);
	idxd_shutdown(pdev);
	mutex_lock(&idxd_idr_lock);
	idr_remove(&idxd_idrs[idxd->type], idxd->id);
	mutex_unlock(&idxd_idr_lock);
	}

	static struct pci_driver idxd_pci_driver = {
	.name = DRV_NAME,
	.id_table = idxd_pci_tbl,
	.probe = idxd_pci_probe,
	.remove = idxd_remove,
	.shutdown = idxd_shutdown,
	};

	static int __init idxd_init_module(void)
	{
	int err, i;

	/*
	* If the CPU does not support write512, there's no point in
	* enumerating the device. We can not utilize it.
	*/
	if (!boot_cpu_has(X86_FEATURE_MOVDIR64B)) {
	pr_warn("idxd driver failed to load without MOVDIR64B.\n");
	return -ENODEV;
	}

	pr_info("%s: Intel(R) Accelerator Devices Driver %s\n",
	DRV_NAME, IDXD_DRIVER_VERSION);

	mutex_init(&idxd_idr_lock);
	for (i = 0; i < IDXD_TYPE_MAX; i++)
	idr_init(&idxd_idrs[i]);

	err = idxd_register_bus_type();
	if (err < 0)
	return err;

	err = idxd_register_driver();
	if (err < 0)
	goto err_idxd_driver_register;

	err = idxd_cdev_register();
	if (err)
	goto err_cdev_register;

	err = pci_register_driver(&idxd_pci_driver);
	if (err)
	goto err_pci_register;

	return 0;

	err_pci_register:
	idxd_cdev_remove();
	err_cdev_register:
	idxd_unregister_driver();
	err_idxd_driver_register:
	idxd_unregister_bus_type();
	return err;
	}
	module_init(idxd_init_module);

	static void __exit idxd_exit_module(void)
	{
	pci_unregister_driver(&idxd_pci_driver);
	idxd_cdev_remove();
	idxd_unregister_bus_type();
	}
	module_exit(idxd_exit_module);