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Diffstat (limited to 'drivers/misc/habanalabs/common/habanalabs_drv.c')
-rw-r--r--drivers/misc/habanalabs/common/habanalabs_drv.c735
1 files changed, 735 insertions, 0 deletions
diff --git a/drivers/misc/habanalabs/common/habanalabs_drv.c b/drivers/misc/habanalabs/common/habanalabs_drv.c
new file mode 100644
index 000000000..ae3cab3f4
--- /dev/null
+++ b/drivers/misc/habanalabs/common/habanalabs_drv.c
@@ -0,0 +1,735 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Copyright 2016-2021 HabanaLabs, Ltd.
+ * All Rights Reserved.
+ *
+ */
+
+#define pr_fmt(fmt) "habanalabs: " fmt
+
+#include "habanalabs.h"
+
+#include <linux/pci.h>
+#include <linux/aer.h>
+#include <linux/module.h>
+
+#define CREATE_TRACE_POINTS
+#include <trace/events/habanalabs.h>
+
+#define HL_DRIVER_AUTHOR "HabanaLabs Kernel Driver Team"
+
+#define HL_DRIVER_DESC "Driver for HabanaLabs's AI Accelerators"
+
+MODULE_AUTHOR(HL_DRIVER_AUTHOR);
+MODULE_DESCRIPTION(HL_DRIVER_DESC);
+MODULE_LICENSE("GPL v2");
+
+static int hl_major;
+static struct class *hl_class;
+static DEFINE_IDR(hl_devs_idr);
+static DEFINE_MUTEX(hl_devs_idr_lock);
+
+#define HL_DEFAULT_TIMEOUT_LOCKED 30 /* 30 seconds */
+#define GAUDI_DEFAULT_TIMEOUT_LOCKED 600 /* 10 minutes */
+
+static int timeout_locked = HL_DEFAULT_TIMEOUT_LOCKED;
+static int reset_on_lockup = 1;
+static int memory_scrub;
+static ulong boot_error_status_mask = ULONG_MAX;
+
+module_param(timeout_locked, int, 0444);
+MODULE_PARM_DESC(timeout_locked,
+ "Device lockup timeout in seconds (0 = disabled, default 30s)");
+
+module_param(reset_on_lockup, int, 0444);
+MODULE_PARM_DESC(reset_on_lockup,
+ "Do device reset on lockup (0 = no, 1 = yes, default yes)");
+
+module_param(memory_scrub, int, 0444);
+MODULE_PARM_DESC(memory_scrub,
+ "Scrub device memory in various states (0 = no, 1 = yes, default no)");
+
+module_param(boot_error_status_mask, ulong, 0444);
+MODULE_PARM_DESC(boot_error_status_mask,
+ "Mask of the error status during device CPU boot (If bitX is cleared then error X is masked. Default all 1's)");
+
+#define PCI_IDS_GOYA 0x0001
+#define PCI_IDS_GAUDI 0x1000
+#define PCI_IDS_GAUDI_SEC 0x1010
+
+#define PCI_IDS_GAUDI2 0x1020
+
+static const struct pci_device_id ids[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_HABANALABS, PCI_IDS_GOYA), },
+ { PCI_DEVICE(PCI_VENDOR_ID_HABANALABS, PCI_IDS_GAUDI), },
+ { PCI_DEVICE(PCI_VENDOR_ID_HABANALABS, PCI_IDS_GAUDI_SEC), },
+ { PCI_DEVICE(PCI_VENDOR_ID_HABANALABS, PCI_IDS_GAUDI2), },
+ { 0, }
+};
+MODULE_DEVICE_TABLE(pci, ids);
+
+/*
+ * get_asic_type - translate device id to asic type
+ *
+ * @device: id of the PCI device
+ *
+ * Translate device id to asic type.
+ * In case of unidentified device, return -1
+ */
+static enum hl_asic_type get_asic_type(u16 device)
+{
+ enum hl_asic_type asic_type;
+
+ switch (device) {
+ case PCI_IDS_GOYA:
+ asic_type = ASIC_GOYA;
+ break;
+ case PCI_IDS_GAUDI:
+ asic_type = ASIC_GAUDI;
+ break;
+ case PCI_IDS_GAUDI_SEC:
+ asic_type = ASIC_GAUDI_SEC;
+ break;
+ case PCI_IDS_GAUDI2:
+ asic_type = ASIC_GAUDI2;
+ break;
+ default:
+ asic_type = ASIC_INVALID;
+ break;
+ }
+
+ return asic_type;
+}
+
+static bool is_asic_secured(enum hl_asic_type asic_type)
+{
+ switch (asic_type) {
+ case ASIC_GAUDI_SEC:
+ return true;
+ default:
+ return false;
+ }
+}
+
+/*
+ * hl_device_open - open function for habanalabs device
+ *
+ * @inode: pointer to inode structure
+ * @filp: pointer to file structure
+ *
+ * Called when process opens an habanalabs device.
+ */
+int hl_device_open(struct inode *inode, struct file *filp)
+{
+ enum hl_device_status status;
+ struct hl_device *hdev;
+ struct hl_fpriv *hpriv;
+ int rc;
+
+ mutex_lock(&hl_devs_idr_lock);
+ hdev = idr_find(&hl_devs_idr, iminor(inode));
+ mutex_unlock(&hl_devs_idr_lock);
+
+ if (!hdev) {
+ pr_err("Couldn't find device %d:%d\n",
+ imajor(inode), iminor(inode));
+ return -ENXIO;
+ }
+
+ hpriv = kzalloc(sizeof(*hpriv), GFP_KERNEL);
+ if (!hpriv)
+ return -ENOMEM;
+
+ hpriv->hdev = hdev;
+ filp->private_data = hpriv;
+ hpriv->filp = filp;
+
+ mutex_init(&hpriv->notifier_event.lock);
+ mutex_init(&hpriv->restore_phase_mutex);
+ mutex_init(&hpriv->ctx_lock);
+ kref_init(&hpriv->refcount);
+ nonseekable_open(inode, filp);
+
+ hl_ctx_mgr_init(&hpriv->ctx_mgr);
+ hl_mem_mgr_init(hpriv->hdev->dev, &hpriv->mem_mgr);
+
+ hpriv->taskpid = get_task_pid(current, PIDTYPE_PID);
+
+ mutex_lock(&hdev->fpriv_list_lock);
+
+ if (!hl_device_operational(hdev, &status)) {
+ dev_dbg_ratelimited(hdev->dev,
+ "Can't open %s because it is %s\n",
+ dev_name(hdev->dev), hdev->status[status]);
+
+ if (status == HL_DEVICE_STATUS_IN_RESET ||
+ status == HL_DEVICE_STATUS_IN_RESET_AFTER_DEVICE_RELEASE)
+ rc = -EAGAIN;
+ else
+ rc = -EPERM;
+
+ goto out_err;
+ }
+
+ if (hdev->is_in_dram_scrub) {
+ dev_dbg_ratelimited(hdev->dev,
+ "Can't open %s during dram scrub\n",
+ dev_name(hdev->dev));
+ rc = -EAGAIN;
+ goto out_err;
+ }
+
+ if (hdev->compute_ctx_in_release) {
+ dev_dbg_ratelimited(hdev->dev,
+ "Can't open %s because another user is still releasing it\n",
+ dev_name(hdev->dev));
+ rc = -EAGAIN;
+ goto out_err;
+ }
+
+ if (hdev->is_compute_ctx_active) {
+ dev_dbg_ratelimited(hdev->dev,
+ "Can't open %s because another user is working on it\n",
+ dev_name(hdev->dev));
+ rc = -EBUSY;
+ goto out_err;
+ }
+
+ rc = hl_ctx_create(hdev, hpriv);
+ if (rc) {
+ dev_err(hdev->dev, "Failed to create context %d\n", rc);
+ goto out_err;
+ }
+
+ list_add(&hpriv->dev_node, &hdev->fpriv_list);
+ mutex_unlock(&hdev->fpriv_list_lock);
+
+ hdev->asic_funcs->send_device_activity(hdev, true);
+
+ hl_debugfs_add_file(hpriv);
+
+ atomic_set(&hdev->captured_err_info.cs_timeout.write_enable, 1);
+ atomic_set(&hdev->captured_err_info.razwi.write_enable, 1);
+ hdev->captured_err_info.undef_opcode.write_enable = true;
+
+ hdev->open_counter++;
+ hdev->last_successful_open_jif = jiffies;
+ hdev->last_successful_open_ktime = ktime_get();
+
+ return 0;
+
+out_err:
+ mutex_unlock(&hdev->fpriv_list_lock);
+ hl_mem_mgr_fini(&hpriv->mem_mgr);
+ hl_ctx_mgr_fini(hpriv->hdev, &hpriv->ctx_mgr);
+ filp->private_data = NULL;
+ mutex_destroy(&hpriv->ctx_lock);
+ mutex_destroy(&hpriv->restore_phase_mutex);
+ mutex_destroy(&hpriv->notifier_event.lock);
+ put_pid(hpriv->taskpid);
+
+ kfree(hpriv);
+
+ return rc;
+}
+
+int hl_device_open_ctrl(struct inode *inode, struct file *filp)
+{
+ struct hl_device *hdev;
+ struct hl_fpriv *hpriv;
+ int rc;
+
+ mutex_lock(&hl_devs_idr_lock);
+ hdev = idr_find(&hl_devs_idr, iminor(inode));
+ mutex_unlock(&hl_devs_idr_lock);
+
+ if (!hdev) {
+ pr_err("Couldn't find device %d:%d\n",
+ imajor(inode), iminor(inode));
+ return -ENXIO;
+ }
+
+ hpriv = kzalloc(sizeof(*hpriv), GFP_KERNEL);
+ if (!hpriv)
+ return -ENOMEM;
+
+ /* Prevent other routines from reading partial hpriv data by
+ * initializing hpriv fields before inserting it to the list
+ */
+ hpriv->hdev = hdev;
+ filp->private_data = hpriv;
+ hpriv->filp = filp;
+
+ mutex_init(&hpriv->notifier_event.lock);
+ nonseekable_open(inode, filp);
+
+ hpriv->taskpid = get_task_pid(current, PIDTYPE_PID);
+
+ mutex_lock(&hdev->fpriv_ctrl_list_lock);
+
+ if (!hl_device_operational(hdev, NULL)) {
+ dev_dbg_ratelimited(hdev->dev_ctrl,
+ "Can't open %s because it is disabled or in reset\n",
+ dev_name(hdev->dev_ctrl));
+ rc = -EPERM;
+ goto out_err;
+ }
+
+ list_add(&hpriv->dev_node, &hdev->fpriv_ctrl_list);
+ mutex_unlock(&hdev->fpriv_ctrl_list_lock);
+
+ return 0;
+
+out_err:
+ mutex_unlock(&hdev->fpriv_ctrl_list_lock);
+ filp->private_data = NULL;
+ put_pid(hpriv->taskpid);
+
+ kfree(hpriv);
+
+ return rc;
+}
+
+static void set_driver_behavior_per_device(struct hl_device *hdev)
+{
+ hdev->nic_ports_mask = 0;
+ hdev->fw_components = FW_TYPE_ALL_TYPES;
+ hdev->mmu_enable = MMU_EN_ALL;
+ hdev->cpu_queues_enable = 1;
+ hdev->pldm = 0;
+ hdev->hard_reset_on_fw_events = 1;
+ hdev->bmc_enable = 1;
+ hdev->reset_on_preboot_fail = 1;
+ hdev->heartbeat = 1;
+}
+
+static void copy_kernel_module_params_to_device(struct hl_device *hdev)
+{
+ hdev->asic_prop.fw_security_enabled = is_asic_secured(hdev->asic_type);
+
+ hdev->major = hl_major;
+ hdev->memory_scrub = memory_scrub;
+ hdev->reset_on_lockup = reset_on_lockup;
+ hdev->boot_error_status_mask = boot_error_status_mask;
+}
+
+static void fixup_device_params_per_asic(struct hl_device *hdev, int timeout)
+{
+ switch (hdev->asic_type) {
+ case ASIC_GAUDI:
+ case ASIC_GAUDI_SEC:
+ /* If user didn't request a different timeout than the default one, we have
+ * a different default timeout for Gaudi
+ */
+ if (timeout == HL_DEFAULT_TIMEOUT_LOCKED)
+ hdev->timeout_jiffies = msecs_to_jiffies(GAUDI_DEFAULT_TIMEOUT_LOCKED *
+ MSEC_PER_SEC);
+
+ hdev->reset_upon_device_release = 0;
+ break;
+
+ case ASIC_GOYA:
+ hdev->reset_upon_device_release = 0;
+ break;
+
+ default:
+ hdev->reset_upon_device_release = 1;
+ break;
+ }
+}
+
+static int fixup_device_params(struct hl_device *hdev)
+{
+ int tmp_timeout;
+
+ tmp_timeout = timeout_locked;
+
+ hdev->fw_poll_interval_usec = HL_FW_STATUS_POLL_INTERVAL_USEC;
+ hdev->fw_comms_poll_interval_usec = HL_FW_STATUS_POLL_INTERVAL_USEC;
+
+ if (tmp_timeout)
+ hdev->timeout_jiffies = msecs_to_jiffies(tmp_timeout * MSEC_PER_SEC);
+ else
+ hdev->timeout_jiffies = MAX_SCHEDULE_TIMEOUT;
+
+ hdev->stop_on_err = true;
+ hdev->reset_info.curr_reset_cause = HL_RESET_CAUSE_UNKNOWN;
+ hdev->reset_info.prev_reset_trigger = HL_RESET_TRIGGER_DEFAULT;
+
+ /* Enable only after the initialization of the device */
+ hdev->disabled = true;
+
+ if (!(hdev->fw_components & FW_TYPE_PREBOOT_CPU) &&
+ (hdev->fw_components & ~FW_TYPE_PREBOOT_CPU)) {
+ pr_err("Preboot must be set along with other components");
+ return -EINVAL;
+ }
+
+ /* If CPU queues not enabled, no way to do heartbeat */
+ if (!hdev->cpu_queues_enable)
+ hdev->heartbeat = 0;
+
+ fixup_device_params_per_asic(hdev, tmp_timeout);
+
+ return 0;
+}
+
+/**
+ * create_hdev - create habanalabs device instance
+ *
+ * @dev: will hold the pointer to the new habanalabs device structure
+ * @pdev: pointer to the pci device
+ *
+ * Allocate memory for habanalabs device and initialize basic fields
+ * Identify the ASIC type
+ * Allocate ID (minor) for the device (only for real devices)
+ */
+static int create_hdev(struct hl_device **dev, struct pci_dev *pdev)
+{
+ int main_id, ctrl_id = 0, rc = 0;
+ struct hl_device *hdev;
+
+ *dev = NULL;
+
+ hdev = kzalloc(sizeof(*hdev), GFP_KERNEL);
+ if (!hdev)
+ return -ENOMEM;
+
+ /* Will be NULL in case of simulator device */
+ hdev->pdev = pdev;
+
+ /* Assign status description string */
+ strncpy(hdev->status[HL_DEVICE_STATUS_OPERATIONAL], "operational", HL_STR_MAX);
+ strncpy(hdev->status[HL_DEVICE_STATUS_IN_RESET], "in reset", HL_STR_MAX);
+ strncpy(hdev->status[HL_DEVICE_STATUS_MALFUNCTION], "disabled", HL_STR_MAX);
+ strncpy(hdev->status[HL_DEVICE_STATUS_NEEDS_RESET], "needs reset", HL_STR_MAX);
+ strncpy(hdev->status[HL_DEVICE_STATUS_IN_DEVICE_CREATION],
+ "in device creation", HL_STR_MAX);
+ strncpy(hdev->status[HL_DEVICE_STATUS_IN_RESET_AFTER_DEVICE_RELEASE],
+ "in reset after device release", HL_STR_MAX);
+
+
+ /* First, we must find out which ASIC are we handling. This is needed
+ * to configure the behavior of the driver (kernel parameters)
+ */
+ hdev->asic_type = get_asic_type(pdev->device);
+ if (hdev->asic_type == ASIC_INVALID) {
+ dev_err(&pdev->dev, "Unsupported ASIC\n");
+ rc = -ENODEV;
+ goto free_hdev;
+ }
+
+ copy_kernel_module_params_to_device(hdev);
+
+ set_driver_behavior_per_device(hdev);
+
+ fixup_device_params(hdev);
+
+ mutex_lock(&hl_devs_idr_lock);
+
+ /* Always save 2 numbers, 1 for main device and 1 for control.
+ * They must be consecutive
+ */
+ main_id = idr_alloc(&hl_devs_idr, hdev, 0, HL_MAX_MINORS, GFP_KERNEL);
+
+ if (main_id >= 0)
+ ctrl_id = idr_alloc(&hl_devs_idr, hdev, main_id + 1,
+ main_id + 2, GFP_KERNEL);
+
+ mutex_unlock(&hl_devs_idr_lock);
+
+ if ((main_id < 0) || (ctrl_id < 0)) {
+ if ((main_id == -ENOSPC) || (ctrl_id == -ENOSPC))
+ pr_err("too many devices in the system\n");
+
+ if (main_id >= 0) {
+ mutex_lock(&hl_devs_idr_lock);
+ idr_remove(&hl_devs_idr, main_id);
+ mutex_unlock(&hl_devs_idr_lock);
+ }
+
+ rc = -EBUSY;
+ goto free_hdev;
+ }
+
+ hdev->id = main_id;
+ hdev->id_control = ctrl_id;
+
+ *dev = hdev;
+
+ return 0;
+
+free_hdev:
+ kfree(hdev);
+ return rc;
+}
+
+/*
+ * destroy_hdev - destroy habanalabs device instance
+ *
+ * @dev: pointer to the habanalabs device structure
+ *
+ */
+static void destroy_hdev(struct hl_device *hdev)
+{
+ /* Remove device from the device list */
+ mutex_lock(&hl_devs_idr_lock);
+ idr_remove(&hl_devs_idr, hdev->id);
+ idr_remove(&hl_devs_idr, hdev->id_control);
+ mutex_unlock(&hl_devs_idr_lock);
+
+ kfree(hdev);
+}
+
+static int hl_pmops_suspend(struct device *dev)
+{
+ struct hl_device *hdev = dev_get_drvdata(dev);
+
+ pr_debug("Going to suspend PCI device\n");
+
+ if (!hdev) {
+ pr_err("device pointer is NULL in suspend\n");
+ return 0;
+ }
+
+ return hl_device_suspend(hdev);
+}
+
+static int hl_pmops_resume(struct device *dev)
+{
+ struct hl_device *hdev = dev_get_drvdata(dev);
+
+ pr_debug("Going to resume PCI device\n");
+
+ if (!hdev) {
+ pr_err("device pointer is NULL in resume\n");
+ return 0;
+ }
+
+ return hl_device_resume(hdev);
+}
+
+/**
+ * hl_pci_probe - probe PCI habanalabs devices
+ *
+ * @pdev: pointer to pci device
+ * @id: pointer to pci device id structure
+ *
+ * Standard PCI probe function for habanalabs device.
+ * Create a new habanalabs device and initialize it according to the
+ * device's type
+ */
+static int hl_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
+{
+ struct hl_device *hdev;
+ int rc;
+
+ dev_info(&pdev->dev, HL_NAME
+ " device found [%04x:%04x] (rev %x)\n",
+ (int)pdev->vendor, (int)pdev->device, (int)pdev->revision);
+
+ rc = create_hdev(&hdev, pdev);
+ if (rc)
+ return rc;
+
+ pci_set_drvdata(pdev, hdev);
+
+ pci_enable_pcie_error_reporting(pdev);
+
+ rc = hl_device_init(hdev, hl_class);
+ if (rc) {
+ dev_err(&pdev->dev, "Fatal error during habanalabs device init\n");
+ rc = -ENODEV;
+ goto disable_device;
+ }
+
+ return 0;
+
+disable_device:
+ pci_disable_pcie_error_reporting(pdev);
+ pci_set_drvdata(pdev, NULL);
+ destroy_hdev(hdev);
+
+ return rc;
+}
+
+/*
+ * hl_pci_remove - remove PCI habanalabs devices
+ *
+ * @pdev: pointer to pci device
+ *
+ * Standard PCI remove function for habanalabs device
+ */
+static void hl_pci_remove(struct pci_dev *pdev)
+{
+ struct hl_device *hdev;
+
+ hdev = pci_get_drvdata(pdev);
+ if (!hdev)
+ return;
+
+ hl_device_fini(hdev);
+ pci_disable_pcie_error_reporting(pdev);
+ pci_set_drvdata(pdev, NULL);
+ destroy_hdev(hdev);
+}
+
+/**
+ * hl_pci_err_detected - a PCI bus error detected on this device
+ *
+ * @pdev: pointer to pci device
+ * @state: PCI error type
+ *
+ * Called by the PCI subsystem whenever a non-correctable
+ * PCI bus error is detected
+ */
+static pci_ers_result_t
+hl_pci_err_detected(struct pci_dev *pdev, pci_channel_state_t state)
+{
+ struct hl_device *hdev = pci_get_drvdata(pdev);
+ enum pci_ers_result result;
+
+ switch (state) {
+ case pci_channel_io_normal:
+ return PCI_ERS_RESULT_CAN_RECOVER;
+
+ case pci_channel_io_frozen:
+ dev_warn(hdev->dev, "frozen state error detected\n");
+ result = PCI_ERS_RESULT_NEED_RESET;
+ break;
+
+ case pci_channel_io_perm_failure:
+ dev_warn(hdev->dev, "failure state error detected\n");
+ result = PCI_ERS_RESULT_DISCONNECT;
+ break;
+
+ default:
+ result = PCI_ERS_RESULT_NONE;
+ }
+
+ hdev->asic_funcs->halt_engines(hdev, true, false);
+
+ return result;
+}
+
+/**
+ * hl_pci_err_resume - resume after a PCI slot reset
+ *
+ * @pdev: pointer to pci device
+ *
+ */
+static void hl_pci_err_resume(struct pci_dev *pdev)
+{
+ struct hl_device *hdev = pci_get_drvdata(pdev);
+
+ dev_warn(hdev->dev, "Resuming device after PCI slot reset\n");
+ hl_device_resume(hdev);
+}
+
+/**
+ * hl_pci_err_slot_reset - a PCI slot reset has just happened
+ *
+ * @pdev: pointer to pci device
+ *
+ * Determine if the driver can recover from the PCI slot reset
+ */
+static pci_ers_result_t hl_pci_err_slot_reset(struct pci_dev *pdev)
+{
+ return PCI_ERS_RESULT_RECOVERED;
+}
+
+static const struct dev_pm_ops hl_pm_ops = {
+ .suspend = hl_pmops_suspend,
+ .resume = hl_pmops_resume,
+};
+
+static const struct pci_error_handlers hl_pci_err_handler = {
+ .error_detected = hl_pci_err_detected,
+ .slot_reset = hl_pci_err_slot_reset,
+ .resume = hl_pci_err_resume,
+};
+
+static struct pci_driver hl_pci_driver = {
+ .name = HL_NAME,
+ .id_table = ids,
+ .probe = hl_pci_probe,
+ .remove = hl_pci_remove,
+ .shutdown = hl_pci_remove,
+ .driver = {
+ .name = HL_NAME,
+ .pm = &hl_pm_ops,
+ .probe_type = PROBE_PREFER_ASYNCHRONOUS,
+ },
+ .err_handler = &hl_pci_err_handler,
+};
+
+/*
+ * hl_init - Initialize the habanalabs kernel driver
+ */
+static int __init hl_init(void)
+{
+ int rc;
+ dev_t dev;
+
+ pr_info("loading driver\n");
+
+ rc = alloc_chrdev_region(&dev, 0, HL_MAX_MINORS, HL_NAME);
+ if (rc < 0) {
+ pr_err("unable to get major\n");
+ return rc;
+ }
+
+ hl_major = MAJOR(dev);
+
+ hl_class = class_create(THIS_MODULE, HL_NAME);
+ if (IS_ERR(hl_class)) {
+ pr_err("failed to allocate class\n");
+ rc = PTR_ERR(hl_class);
+ goto remove_major;
+ }
+
+ hl_debugfs_init();
+
+ rc = pci_register_driver(&hl_pci_driver);
+ if (rc) {
+ pr_err("failed to register pci device\n");
+ goto remove_debugfs;
+ }
+
+ pr_debug("driver loaded\n");
+
+ return 0;
+
+remove_debugfs:
+ hl_debugfs_fini();
+ class_destroy(hl_class);
+remove_major:
+ unregister_chrdev_region(MKDEV(hl_major, 0), HL_MAX_MINORS);
+ return rc;
+}
+
+/*
+ * hl_exit - Release all resources of the habanalabs kernel driver
+ */
+static void __exit hl_exit(void)
+{
+ pci_unregister_driver(&hl_pci_driver);
+
+ /*
+ * Removing debugfs must be after all devices or simulator devices
+ * have been removed because otherwise we get a bug in the
+ * debugfs module for referencing NULL objects
+ */
+ hl_debugfs_fini();
+
+ class_destroy(hl_class);
+ unregister_chrdev_region(MKDEV(hl_major, 0), HL_MAX_MINORS);
+
+ idr_destroy(&hl_devs_idr);
+
+ pr_debug("driver removed\n");
+}
+
+module_init(hl_init);
+module_exit(hl_exit);