Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 1541 insertions, 0 deletions

diff --git a/drivers/misc/habanalabs/common/device.c b/drivers/misc/habanalabs/common/device.c
new file mode 100644
index 000000000..7b0bf4707
--- /dev/null
+++ b/drivers/misc/habanalabs/common/device.c
@@ -0,0 +1,1541 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Copyright 2016-2019 HabanaLabs, Ltd.
+ * All Rights Reserved.
+ */
+
+#define pr_fmt(fmt)			"habanalabs: " fmt
+
+#include "habanalabs.h"
+
+#include <linux/pci.h>
+#include <linux/sched/signal.h>
+#include <linux/hwmon.h>
+#include <uapi/misc/habanalabs.h>
+
+#define HL_PLDM_PENDING_RESET_PER_SEC	(HL_PENDING_RESET_PER_SEC * 10)
+
+bool hl_device_disabled_or_in_reset(struct hl_device *hdev)
+{
+	if ((hdev->disabled) || (atomic_read(&hdev->in_reset)))
+		return true;
+	else
+		return false;
+}
+
+enum hl_device_status hl_device_status(struct hl_device *hdev)
+{
+	enum hl_device_status status;
+
+	if (hdev->disabled)
+		status = HL_DEVICE_STATUS_MALFUNCTION;
+	else if (atomic_read(&hdev->in_reset))
+		status = HL_DEVICE_STATUS_IN_RESET;
+	else
+		status = HL_DEVICE_STATUS_OPERATIONAL;
+
+	return status;
+}
+
+static void hpriv_release(struct kref *ref)
+{
+	struct hl_fpriv *hpriv;
+	struct hl_device *hdev;
+
+	hpriv = container_of(ref, struct hl_fpriv, refcount);
+
+	hdev = hpriv->hdev;
+
+	put_pid(hpriv->taskpid);
+
+	hl_debugfs_remove_file(hpriv);
+
+	mutex_destroy(&hpriv->restore_phase_mutex);
+
+	mutex_lock(&hdev->fpriv_list_lock);
+	list_del(&hpriv->dev_node);
+	hdev->compute_ctx = NULL;
+	mutex_unlock(&hdev->fpriv_list_lock);
+
+	kfree(hpriv);
+}
+
+void hl_hpriv_get(struct hl_fpriv *hpriv)
+{
+	kref_get(&hpriv->refcount);
+}
+
+void hl_hpriv_put(struct hl_fpriv *hpriv)
+{
+	kref_put(&hpriv->refcount, hpriv_release);
+}
+
+/*
+ * hl_device_release - release function for habanalabs device
+ *
+ * @inode: pointer to inode structure
+ * @filp: pointer to file structure
+ *
+ * Called when process closes an habanalabs device
+ */
+static int hl_device_release(struct inode *inode, struct file *filp)
+{
+	struct hl_fpriv *hpriv = filp->private_data;
+
+	hl_cb_mgr_fini(hpriv->hdev, &hpriv->cb_mgr);
+	hl_ctx_mgr_fini(hpriv->hdev, &hpriv->ctx_mgr);
+
+	filp->private_data = NULL;
+
+	hl_hpriv_put(hpriv);
+
+	return 0;
+}
+
+static int hl_device_release_ctrl(struct inode *inode, struct file *filp)
+{
+	struct hl_fpriv *hpriv = filp->private_data;
+	struct hl_device *hdev;
+
+	filp->private_data = NULL;
+
+	hdev = hpriv->hdev;
+
+	mutex_lock(&hdev->fpriv_list_lock);
+	list_del(&hpriv->dev_node);
+	mutex_unlock(&hdev->fpriv_list_lock);
+
+	put_pid(hpriv->taskpid);
+
+	kfree(hpriv);
+
+	return 0;
+}
+
+/*
+ * hl_mmap - mmap function for habanalabs device
+ *
+ * @*filp: pointer to file structure
+ * @*vma: pointer to vm_area_struct of the process
+ *
+ * Called when process does an mmap on habanalabs device. Call the device's mmap
+ * function at the end of the common code.
+ */
+static int hl_mmap(struct file *filp, struct vm_area_struct *vma)
+{
+	struct hl_fpriv *hpriv = filp->private_data;
+	unsigned long vm_pgoff;
+
+	vm_pgoff = vma->vm_pgoff;
+	vma->vm_pgoff = HL_MMAP_OFFSET_VALUE_GET(vm_pgoff);
+
+	switch (vm_pgoff & HL_MMAP_TYPE_MASK) {
+	case HL_MMAP_TYPE_CB:
+		return hl_cb_mmap(hpriv, vma);
+	}
+
+	return -EINVAL;
+}
+
+static const struct file_operations hl_ops = {
+	.owner = THIS_MODULE,
+	.open = hl_device_open,
+	.release = hl_device_release,
+	.mmap = hl_mmap,
+	.unlocked_ioctl = hl_ioctl,
+	.compat_ioctl = hl_ioctl
+};
+
+static const struct file_operations hl_ctrl_ops = {
+	.owner = THIS_MODULE,
+	.open = hl_device_open_ctrl,
+	.release = hl_device_release_ctrl,
+	.unlocked_ioctl = hl_ioctl_control,
+	.compat_ioctl = hl_ioctl_control
+};
+
+static void device_release_func(struct device *dev)
+{
+	kfree(dev);
+}
+
+/*
+ * device_init_cdev - Initialize cdev and device for habanalabs device
+ *
+ * @hdev: pointer to habanalabs device structure
+ * @hclass: pointer to the class object of the device
+ * @minor: minor number of the specific device
+ * @fpos: file operations to install for this device
+ * @name: name of the device as it will appear in the filesystem
+ * @cdev: pointer to the char device object that will be initialized
+ * @dev: pointer to the device object that will be initialized
+ *
+ * Initialize a cdev and a Linux device for habanalabs's device.
+ */
+static int device_init_cdev(struct hl_device *hdev, struct class *hclass,
+				int minor, const struct file_operations *fops,
+				char *name, struct cdev *cdev,
+				struct device **dev)
+{
+	cdev_init(cdev, fops);
+	cdev->owner = THIS_MODULE;
+
+	*dev = kzalloc(sizeof(**dev), GFP_KERNEL);
+	if (!*dev)
+		return -ENOMEM;
+
+	device_initialize(*dev);
+	(*dev)->devt = MKDEV(hdev->major, minor);
+	(*dev)->class = hclass;
+	(*dev)->release = device_release_func;
+	dev_set_drvdata(*dev, hdev);
+	dev_set_name(*dev, "%s", name);
+
+	return 0;
+}
+
+static int device_cdev_sysfs_add(struct hl_device *hdev)
+{
+	int rc;
+
+	rc = cdev_device_add(&hdev->cdev, hdev->dev);
+	if (rc) {
+		dev_err(hdev->dev,
+			"failed to add a char device to the system\n");
+		return rc;
+	}
+
+	rc = cdev_device_add(&hdev->cdev_ctrl, hdev->dev_ctrl);
+	if (rc) {
+		dev_err(hdev->dev,
+			"failed to add a control char device to the system\n");
+		goto delete_cdev_device;
+	}
+
+	/* hl_sysfs_init() must be done after adding the device to the system */
+	rc = hl_sysfs_init(hdev);
+	if (rc) {
+		dev_err(hdev->dev, "failed to initialize sysfs\n");
+		goto delete_ctrl_cdev_device;
+	}
+
+	hdev->cdev_sysfs_created = true;
+
+	return 0;
+
+delete_ctrl_cdev_device:
+	cdev_device_del(&hdev->cdev_ctrl, hdev->dev_ctrl);
+delete_cdev_device:
+	cdev_device_del(&hdev->cdev, hdev->dev);
+	return rc;
+}
+
+static void device_cdev_sysfs_del(struct hl_device *hdev)
+{
+	if (!hdev->cdev_sysfs_created)
+		goto put_devices;
+
+	hl_sysfs_fini(hdev);
+	cdev_device_del(&hdev->cdev_ctrl, hdev->dev_ctrl);
+	cdev_device_del(&hdev->cdev, hdev->dev);
+
+put_devices:
+	put_device(hdev->dev);
+	put_device(hdev->dev_ctrl);
+}
+
+/*
+ * device_early_init - do some early initialization for the habanalabs device
+ *
+ * @hdev: pointer to habanalabs device structure
+ *
+ * Install the relevant function pointers and call the early_init function,
+ * if such a function exists
+ */
+static int device_early_init(struct hl_device *hdev)
+{
+	int i, rc;
+	char workq_name[32];
+
+	switch (hdev->asic_type) {
+	case ASIC_GOYA:
+		goya_set_asic_funcs(hdev);
+		strlcpy(hdev->asic_name, "GOYA", sizeof(hdev->asic_name));
+		break;
+	case ASIC_GAUDI:
+		gaudi_set_asic_funcs(hdev);
+		sprintf(hdev->asic_name, "GAUDI");
+		break;
+	default:
+		dev_err(hdev->dev, "Unrecognized ASIC type %d\n",
+			hdev->asic_type);
+		return -EINVAL;
+	}
+
+	rc = hdev->asic_funcs->early_init(hdev);
+	if (rc)
+		return rc;
+
+	rc = hl_asid_init(hdev);
+	if (rc)
+		goto early_fini;
+
+	if (hdev->asic_prop.completion_queues_count) {
+		hdev->cq_wq = kcalloc(hdev->asic_prop.completion_queues_count,
+				sizeof(*hdev->cq_wq),
+				GFP_ATOMIC);
+		if (!hdev->cq_wq) {
+			rc = -ENOMEM;
+			goto asid_fini;
+		}
+	}
+
+	for (i = 0 ; i < hdev->asic_prop.completion_queues_count ; i++) {
+		snprintf(workq_name, 32, "hl-free-jobs-%u", (u32) i);
+		hdev->cq_wq[i] = create_singlethread_workqueue(workq_name);
+		if (hdev->cq_wq[i] == NULL) {
+			dev_err(hdev->dev, "Failed to allocate CQ workqueue\n");
+			rc = -ENOMEM;
+			goto free_cq_wq;
+		}
+	}
+
+	hdev->eq_wq = alloc_workqueue("hl-events", WQ_UNBOUND, 0);
+	if (hdev->eq_wq == NULL) {
+		dev_err(hdev->dev, "Failed to allocate EQ workqueue\n");
+		rc = -ENOMEM;
+		goto free_cq_wq;
+	}
+
+	hdev->hl_chip_info = kzalloc(sizeof(struct hwmon_chip_info),
+					GFP_KERNEL);
+	if (!hdev->hl_chip_info) {
+		rc = -ENOMEM;
+		goto free_eq_wq;
+	}
+
+	hdev->idle_busy_ts_arr = kmalloc_array(HL_IDLE_BUSY_TS_ARR_SIZE,
+					sizeof(struct hl_device_idle_busy_ts),
+					(GFP_KERNEL | __GFP_ZERO));
+	if (!hdev->idle_busy_ts_arr) {
+		rc = -ENOMEM;
+		goto free_chip_info;
+	}
+
+	rc = hl_mmu_if_set_funcs(hdev);
+	if (rc)
+		goto free_idle_busy_ts_arr;
+
+	hl_cb_mgr_init(&hdev->kernel_cb_mgr);
+
+	mutex_init(&hdev->send_cpu_message_lock);
+	mutex_init(&hdev->debug_lock);
+	mutex_init(&hdev->mmu_cache_lock);
+	INIT_LIST_HEAD(&hdev->hw_queues_mirror_list);
+	spin_lock_init(&hdev->hw_queues_mirror_lock);
+	INIT_LIST_HEAD(&hdev->fpriv_list);
+	mutex_init(&hdev->fpriv_list_lock);
+	atomic_set(&hdev->in_reset, 0);
+
+	return 0;
+
+free_idle_busy_ts_arr:
+	kfree(hdev->idle_busy_ts_arr);
+free_chip_info:
+	kfree(hdev->hl_chip_info);
+free_eq_wq:
+	destroy_workqueue(hdev->eq_wq);
+free_cq_wq:
+	for (i = 0 ; i < hdev->asic_prop.completion_queues_count ; i++)
+		if (hdev->cq_wq[i])
+			destroy_workqueue(hdev->cq_wq[i]);
+	kfree(hdev->cq_wq);
+asid_fini:
+	hl_asid_fini(hdev);
+early_fini:
+	if (hdev->asic_funcs->early_fini)
+		hdev->asic_funcs->early_fini(hdev);
+
+	return rc;
+}
+
+/*
+ * device_early_fini - finalize all that was done in device_early_init
+ *
+ * @hdev: pointer to habanalabs device structure
+ *
+ */
+static void device_early_fini(struct hl_device *hdev)
+{
+	int i;
+
+	mutex_destroy(&hdev->mmu_cache_lock);
+	mutex_destroy(&hdev->debug_lock);
+	mutex_destroy(&hdev->send_cpu_message_lock);
+
+	mutex_destroy(&hdev->fpriv_list_lock);
+
+	hl_cb_mgr_fini(hdev, &hdev->kernel_cb_mgr);
+
+	kfree(hdev->idle_busy_ts_arr);
+	kfree(hdev->hl_chip_info);
+
+	destroy_workqueue(hdev->eq_wq);
+
+	for (i = 0 ; i < hdev->asic_prop.completion_queues_count ; i++)
+		destroy_workqueue(hdev->cq_wq[i]);
+	kfree(hdev->cq_wq);
+
+	hl_asid_fini(hdev);
+
+	if (hdev->asic_funcs->early_fini)
+		hdev->asic_funcs->early_fini(hdev);
+}
+
+static void set_freq_to_low_job(struct work_struct *work)
+{
+	struct hl_device *hdev = container_of(work, struct hl_device,
+						work_freq.work);
+
+	mutex_lock(&hdev->fpriv_list_lock);
+
+	if (!hdev->compute_ctx)
+		hl_device_set_frequency(hdev, PLL_LOW);
+
+	mutex_unlock(&hdev->fpriv_list_lock);
+
+	schedule_delayed_work(&hdev->work_freq,
+			usecs_to_jiffies(HL_PLL_LOW_JOB_FREQ_USEC));
+}
+
+static void hl_device_heartbeat(struct work_struct *work)
+{
+	struct hl_device *hdev = container_of(work, struct hl_device,
+						work_heartbeat.work);
+
+	if (hl_device_disabled_or_in_reset(hdev))
+		goto reschedule;
+
+	if (!hdev->asic_funcs->send_heartbeat(hdev))
+		goto reschedule;
+
+	dev_err(hdev->dev, "Device heartbeat failed!\n");
+	hl_device_reset(hdev, true, false);
+
+	return;
+
+reschedule:
+	schedule_delayed_work(&hdev->work_heartbeat,
+			usecs_to_jiffies(HL_HEARTBEAT_PER_USEC));
+}
+
+/*
+ * device_late_init - do late stuff initialization for the habanalabs device
+ *
+ * @hdev: pointer to habanalabs device structure
+ *
+ * Do stuff that either needs the device H/W queues to be active or needs
+ * to happen after all the rest of the initialization is finished
+ */
+static int device_late_init(struct hl_device *hdev)
+{
+	int rc;
+
+	if (hdev->asic_funcs->late_init) {
+		rc = hdev->asic_funcs->late_init(hdev);
+		if (rc) {
+			dev_err(hdev->dev,
+				"failed late initialization for the H/W\n");
+			return rc;
+		}
+	}
+
+	hdev->high_pll = hdev->asic_prop.high_pll;
+
+	/* force setting to low frequency */
+	hdev->curr_pll_profile = PLL_LOW;
+
+	if (hdev->pm_mng_profile == PM_AUTO)
+		hdev->asic_funcs->set_pll_profile(hdev, PLL_LOW);
+	else
+		hdev->asic_funcs->set_pll_profile(hdev, PLL_LAST);
+
+	INIT_DELAYED_WORK(&hdev->work_freq, set_freq_to_low_job);
+	schedule_delayed_work(&hdev->work_freq,
+	usecs_to_jiffies(HL_PLL_LOW_JOB_FREQ_USEC));
+
+	if (hdev->heartbeat) {
+		INIT_DELAYED_WORK(&hdev->work_heartbeat, hl_device_heartbeat);
+		schedule_delayed_work(&hdev->work_heartbeat,
+				usecs_to_jiffies(HL_HEARTBEAT_PER_USEC));
+	}
+
+	hdev->late_init_done = true;
+
+	return 0;
+}
+
+/*
+ * device_late_fini - finalize all that was done in device_late_init
+ *
+ * @hdev: pointer to habanalabs device structure
+ *
+ */
+static void device_late_fini(struct hl_device *hdev)
+{
+	if (!hdev->late_init_done)
+		return;
+
+	cancel_delayed_work_sync(&hdev->work_freq);
+	if (hdev->heartbeat)
+		cancel_delayed_work_sync(&hdev->work_heartbeat);
+
+	if (hdev->asic_funcs->late_fini)
+		hdev->asic_funcs->late_fini(hdev);
+
+	hdev->late_init_done = false;
+}
+
+uint32_t hl_device_utilization(struct hl_device *hdev, uint32_t period_ms)
+{
+	struct hl_device_idle_busy_ts *ts;
+	ktime_t zero_ktime, curr = ktime_get();
+	u32 overlap_cnt = 0, last_index = hdev->idle_busy_ts_idx;
+	s64 period_us, last_start_us, last_end_us, last_busy_time_us,
+		total_busy_time_us = 0, total_busy_time_ms;
+
+	zero_ktime = ktime_set(0, 0);
+	period_us = period_ms * USEC_PER_MSEC;
+	ts = &hdev->idle_busy_ts_arr[last_index];
+
+	/* check case that device is currently in idle */
+	if (!ktime_compare(ts->busy_to_idle_ts, zero_ktime) &&
+			!ktime_compare(ts->idle_to_busy_ts, zero_ktime)) {
+
+		last_index--;
+		/* Handle case idle_busy_ts_idx was 0 */
+		if (last_index > HL_IDLE_BUSY_TS_ARR_SIZE)
+			last_index = HL_IDLE_BUSY_TS_ARR_SIZE - 1;
+
+		ts = &hdev->idle_busy_ts_arr[last_index];
+	}
+
+	while (overlap_cnt < HL_IDLE_BUSY_TS_ARR_SIZE) {
+		/* Check if we are in last sample case. i.e. if the sample
+		 * begun before the sampling period. This could be a real
+		 * sample or 0 so need to handle both cases
+		 */
+		last_start_us = ktime_to_us(
+				ktime_sub(curr, ts->idle_to_busy_ts));
+
+		if (last_start_us > period_us) {
+
+			/* First check two cases:
+			 * 1. If the device is currently busy
+			 * 2. If the device was idle during the whole sampling
+			 *    period
+			 */
+
+			if (!ktime_compare(ts->busy_to_idle_ts, zero_ktime)) {
+				/* Check if the device is currently busy */
+				if (ktime_compare(ts->idle_to_busy_ts,
+						zero_ktime))
+					return 100;
+
+				/* We either didn't have any activity or we
+				 * reached an entry which is 0. Either way,
+				 * exit and return what was accumulated so far
+				 */
+				break;
+			}
+
+			/* If sample has finished, check it is relevant */
+			last_end_us = ktime_to_us(
+					ktime_sub(curr, ts->busy_to_idle_ts));
+
+			if (last_end_us > period_us)
+				break;
+
+			/* It is relevant so add it but with adjustment */
+			last_busy_time_us = ktime_to_us(
+						ktime_sub(ts->busy_to_idle_ts,
+						ts->idle_to_busy_ts));
+			total_busy_time_us += last_busy_time_us -
+					(last_start_us - period_us);
+			break;
+		}
+
+		/* Check if the sample is finished or still open */
+		if (ktime_compare(ts->busy_to_idle_ts, zero_ktime))
+			last_busy_time_us = ktime_to_us(
+						ktime_sub(ts->busy_to_idle_ts,
+						ts->idle_to_busy_ts));
+		else
+			last_busy_time_us = ktime_to_us(
+					ktime_sub(curr, ts->idle_to_busy_ts));
+
+		total_busy_time_us += last_busy_time_us;
+
+		last_index--;
+		/* Handle case idle_busy_ts_idx was 0 */
+		if (last_index > HL_IDLE_BUSY_TS_ARR_SIZE)
+			last_index = HL_IDLE_BUSY_TS_ARR_SIZE - 1;
+
+		ts = &hdev->idle_busy_ts_arr[last_index];
+
+		overlap_cnt++;
+	}
+
+	total_busy_time_ms = DIV_ROUND_UP_ULL(total_busy_time_us,
+						USEC_PER_MSEC);
+
+	return DIV_ROUND_UP_ULL(total_busy_time_ms * 100, period_ms);
+}
+
+/*
+ * hl_device_set_frequency - set the frequency of the device
+ *
+ * @hdev: pointer to habanalabs device structure
+ * @freq: the new frequency value
+ *
+ * Change the frequency if needed. This function has no protection against
+ * concurrency, therefore it is assumed that the calling function has protected
+ * itself against the case of calling this function from multiple threads with
+ * different values
+ *
+ * Returns 0 if no change was done, otherwise returns 1
+ */
+int hl_device_set_frequency(struct hl_device *hdev, enum hl_pll_frequency freq)
+{
+	if ((hdev->pm_mng_profile == PM_MANUAL) ||
+			(hdev->curr_pll_profile == freq))
+		return 0;
+
+	dev_dbg(hdev->dev, "Changing device frequency to %s\n",
+		freq == PLL_HIGH ? "high" : "low");
+
+	hdev->asic_funcs->set_pll_profile(hdev, freq);
+
+	hdev->curr_pll_profile = freq;
+
+	return 1;
+}
+
+int hl_device_set_debug_mode(struct hl_device *hdev, bool enable)
+{
+	int rc = 0;
+
+	mutex_lock(&hdev->debug_lock);
+
+	if (!enable) {
+		if (!hdev->in_debug) {
+			dev_err(hdev->dev,
+				"Failed to disable debug mode because device was not in debug mode\n");
+			rc = -EFAULT;
+			goto out;
+		}
+
+		if (!hdev->hard_reset_pending)
+			hdev->asic_funcs->halt_coresight(hdev);
+
+		hdev->in_debug = 0;
+
+		if (!hdev->hard_reset_pending)
+			hdev->asic_funcs->set_clock_gating(hdev);
+
+		goto out;
+	}
+
+	if (hdev->in_debug) {
+		dev_err(hdev->dev,
+			"Failed to enable debug mode because device is already in debug mode\n");
+		rc = -EFAULT;
+		goto out;
+	}
+
+	hdev->asic_funcs->disable_clock_gating(hdev);
+	hdev->in_debug = 1;
+
+out:
+	mutex_unlock(&hdev->debug_lock);
+
+	return rc;
+}
+
+/*
+ * hl_device_suspend - initiate device suspend
+ *
+ * @hdev: pointer to habanalabs device structure
+ *
+ * Puts the hw in the suspend state (all asics).
+ * Returns 0 for success or an error on failure.
+ * Called at driver suspend.
+ */
+int hl_device_suspend(struct hl_device *hdev)
+{
+	int rc;
+
+	pci_save_state(hdev->pdev);
+
+	/* Block future CS/VM/JOB completion operations */
+	rc = atomic_cmpxchg(&hdev->in_reset, 0, 1);
+	if (rc) {
+		dev_err(hdev->dev, "Can't suspend while in reset\n");
+		return -EIO;
+	}
+
+	/* This blocks all other stuff that is not blocked by in_reset */
+	hdev->disabled = true;
+
+	/*
+	 * Flush anyone that is inside the critical section of enqueue
+	 * jobs to the H/W
+	 */
+	hdev->asic_funcs->hw_queues_lock(hdev);
+	hdev->asic_funcs->hw_queues_unlock(hdev);
+
+	/* Flush processes that are sending message to CPU */
+	mutex_lock(&hdev->send_cpu_message_lock);
+	mutex_unlock(&hdev->send_cpu_message_lock);
+
+	rc = hdev->asic_funcs->suspend(hdev);
+	if (rc)
+		dev_err(hdev->dev,
+			"Failed to disable PCI access of device CPU\n");
+
+	/* Shut down the device */
+	pci_disable_device(hdev->pdev);
+	pci_set_power_state(hdev->pdev, PCI_D3hot);
+
+	return 0;
+}
+
+/*
+ * hl_device_resume - initiate device resume
+ *
+ * @hdev: pointer to habanalabs device structure
+ *
+ * Bring the hw back to operating state (all asics).
+ * Returns 0 for success or an error on failure.
+ * Called at driver resume.
+ */
+int hl_device_resume(struct hl_device *hdev)
+{
+	int rc;
+
+	pci_set_power_state(hdev->pdev, PCI_D0);
+	pci_restore_state(hdev->pdev);
+	rc = pci_enable_device_mem(hdev->pdev);
+	if (rc) {
+		dev_err(hdev->dev,
+			"Failed to enable PCI device in resume\n");
+		return rc;
+	}
+
+	pci_set_master(hdev->pdev);
+
+	rc = hdev->asic_funcs->resume(hdev);
+	if (rc) {
+		dev_err(hdev->dev, "Failed to resume device after suspend\n");
+		goto disable_device;
+	}
+
+
+	hdev->disabled = false;
+	atomic_set(&hdev->in_reset, 0);
+
+	rc = hl_device_reset(hdev, true, false);
+	if (rc) {
+		dev_err(hdev->dev, "Failed to reset device during resume\n");
+		goto disable_device;
+	}
+
+	return 0;
+
+disable_device:
+	pci_clear_master(hdev->pdev);
+	pci_disable_device(hdev->pdev);
+
+	return rc;
+}
+
+static int device_kill_open_processes(struct hl_device *hdev)
+{
+	u16 pending_total, pending_cnt;
+	struct hl_fpriv	*hpriv;
+	struct task_struct *task = NULL;
+
+	if (hdev->pldm)
+		pending_total = HL_PLDM_PENDING_RESET_PER_SEC;
+	else
+		pending_total = HL_PENDING_RESET_PER_SEC;
+
+	/* Giving time for user to close FD, and for processes that are inside
+	 * hl_device_open to finish
+	 */
+	if (!list_empty(&hdev->fpriv_list))
+		ssleep(1);
+
+	mutex_lock(&hdev->fpriv_list_lock);
+
+	/* This section must be protected because we are dereferencing
+	 * pointers that are freed if the process exits
+	 */
+	list_for_each_entry(hpriv, &hdev->fpriv_list, dev_node) {
+		task = get_pid_task(hpriv->taskpid, PIDTYPE_PID);
+		if (task) {
+			dev_info(hdev->dev, "Killing user process pid=%d\n",
+				task_pid_nr(task));
+			send_sig(SIGKILL, task, 1);
+			usleep_range(1000, 10000);
+
+			put_task_struct(task);
+		}
+	}
+
+	mutex_unlock(&hdev->fpriv_list_lock);
+
+	/* We killed the open users, but because the driver cleans up after the
+	 * user contexts are closed (e.g. mmu mappings), we need to wait again
+	 * to make sure the cleaning phase is finished before continuing with
+	 * the reset
+	 */
+
+	pending_cnt = pending_total;
+
+	while ((!list_empty(&hdev->fpriv_list)) && (pending_cnt)) {
+		dev_info(hdev->dev,
+			"Waiting for all unmap operations to finish before hard reset\n");
+
+		pending_cnt--;
+
+		ssleep(1);
+	}
+
+	return list_empty(&hdev->fpriv_list) ? 0 : -EBUSY;
+}
+
+static void device_hard_reset_pending(struct work_struct *work)
+{
+	struct hl_device_reset_work *device_reset_work =
+		container_of(work, struct hl_device_reset_work, reset_work);
+	struct hl_device *hdev = device_reset_work->hdev;
+
+	hl_device_reset(hdev, true, true);
+
+	kfree(device_reset_work);
+}
+
+/*
+ * hl_device_reset - reset the device
+ *
+ * @hdev: pointer to habanalabs device structure
+ * @hard_reset: should we do hard reset to all engines or just reset the
+ *              compute/dma engines
+ * @from_hard_reset_thread: is the caller the hard-reset thread
+ *
+ * Block future CS and wait for pending CS to be enqueued
+ * Call ASIC H/W fini
+ * Flush all completions
+ * Re-initialize all internal data structures
+ * Call ASIC H/W init, late_init
+ * Test queues
+ * Enable device
+ *
+ * Returns 0 for success or an error on failure.
+ */
+int hl_device_reset(struct hl_device *hdev, bool hard_reset,
+			bool from_hard_reset_thread)
+{
+	int i, rc;
+
+	if (!hdev->init_done) {
+		dev_err(hdev->dev,
+			"Can't reset before initialization is done\n");
+		return 0;
+	}
+
+	if ((!hard_reset) && (!hdev->supports_soft_reset)) {
+		dev_dbg(hdev->dev, "Doing hard-reset instead of soft-reset\n");
+		hard_reset = true;
+	}
+
+	/*
+	 * Prevent concurrency in this function - only one reset should be
+	 * done at any given time. Only need to perform this if we didn't
+	 * get from the dedicated hard reset thread
+	 */
+	if (!from_hard_reset_thread) {
+		/* Block future CS/VM/JOB completion operations */
+		rc = atomic_cmpxchg(&hdev->in_reset, 0, 1);
+		if (rc)
+			return 0;
+
+		if (hard_reset) {
+			/* Disable PCI access from device F/W so he won't send
+			 * us additional interrupts. We disable MSI/MSI-X at
+			 * the halt_engines function and we can't have the F/W
+			 * sending us interrupts after that. We need to disable
+			 * the access here because if the device is marked
+			 * disable, the message won't be send. Also, in case
+			 * of heartbeat, the device CPU is marked as disable
+			 * so this message won't be sent
+			 */
+			if (hl_fw_send_pci_access_msg(hdev,
+					CPUCP_PACKET_DISABLE_PCI_ACCESS))
+				dev_warn(hdev->dev,
+					"Failed to disable PCI access by F/W\n");
+		}
+
+		/* This also blocks future CS/VM/JOB completion operations */
+		hdev->disabled = true;
+
+		/* Flush anyone that is inside the critical section of enqueue
+		 * jobs to the H/W
+		 */
+		hdev->asic_funcs->hw_queues_lock(hdev);
+		hdev->asic_funcs->hw_queues_unlock(hdev);
+
+		/* Flush anyone that is inside device open */
+		mutex_lock(&hdev->fpriv_list_lock);
+		mutex_unlock(&hdev->fpriv_list_lock);
+
+		dev_err(hdev->dev, "Going to RESET device!\n");
+	}
+
+again:
+	if ((hard_reset) && (!from_hard_reset_thread)) {
+		struct hl_device_reset_work *device_reset_work;
+
+		hdev->hard_reset_pending = true;
+
+		device_reset_work = kzalloc(sizeof(*device_reset_work),
+						GFP_ATOMIC);
+		if (!device_reset_work) {
+			rc = -ENOMEM;
+			goto out_err;
+		}
+
+		/*
+		 * Because the reset function can't run from interrupt or
+		 * from heartbeat work, we need to call the reset function
+		 * from a dedicated work
+		 */
+		INIT_WORK(&device_reset_work->reset_work,
+				device_hard_reset_pending);
+		device_reset_work->hdev = hdev;
+		schedule_work(&device_reset_work->reset_work);
+
+		return 0;
+	}
+
+	if (hard_reset) {
+		device_late_fini(hdev);
+
+		/*
+		 * Now that the heartbeat thread is closed, flush processes
+		 * which are sending messages to CPU
+		 */
+		mutex_lock(&hdev->send_cpu_message_lock);
+		mutex_unlock(&hdev->send_cpu_message_lock);
+	}
+
+	/*
+	 * Halt the engines and disable interrupts so we won't get any more
+	 * completions from H/W and we won't have any accesses from the
+	 * H/W to the host machine
+	 */
+	hdev->asic_funcs->halt_engines(hdev, hard_reset);
+
+	/* Go over all the queues, release all CS and their jobs */
+	hl_cs_rollback_all(hdev);
+
+	if (hard_reset) {
+		/* Kill processes here after CS rollback. This is because the
+		 * process can't really exit until all its CSs are done, which
+		 * is what we do in cs rollback
+		 */
+		rc = device_kill_open_processes(hdev);
+		if (rc) {
+			dev_crit(hdev->dev,
+				"Failed to kill all open processes, stopping hard reset\n");
+			goto out_err;
+		}
+
+		/* Flush the Event queue workers to make sure no other thread is
+		 * reading or writing to registers during the reset
+		 */
+		flush_workqueue(hdev->eq_wq);
+	}
+
+	/* Reset the H/W. It will be in idle state after this returns */
+	hdev->asic_funcs->hw_fini(hdev, hard_reset);
+
+	if (hard_reset) {
+		/* Release kernel context */
+		if (hl_ctx_put(hdev->kernel_ctx) == 1)
+			hdev->kernel_ctx = NULL;
+		hl_vm_fini(hdev);
+		hl_mmu_fini(hdev);
+		hl_eq_reset(hdev, &hdev->event_queue);
+	}
+
+	/* Re-initialize PI,CI to 0 in all queues (hw queue, cq) */
+	hl_hw_queue_reset(hdev, hard_reset);
+	for (i = 0 ; i < hdev->asic_prop.completion_queues_count ; i++)
+		hl_cq_reset(hdev, &hdev->completion_queue[i]);
+
+	hdev->idle_busy_ts_idx = 0;
+	hdev->idle_busy_ts_arr[0].busy_to_idle_ts = ktime_set(0, 0);
+	hdev->idle_busy_ts_arr[0].idle_to_busy_ts = ktime_set(0, 0);
+
+	if (hdev->cs_active_cnt)
+		dev_crit(hdev->dev, "CS active cnt %d is not 0 during reset\n",
+			hdev->cs_active_cnt);
+
+	mutex_lock(&hdev->fpriv_list_lock);
+
+	/* Make sure the context switch phase will run again */
+	if (hdev->compute_ctx) {
+		atomic_set(&hdev->compute_ctx->thread_ctx_switch_token, 1);
+		hdev->compute_ctx->thread_ctx_switch_wait_token = 0;
+	}
+
+	mutex_unlock(&hdev->fpriv_list_lock);
+
+	/* Finished tear-down, starting to re-initialize */
+
+	if (hard_reset) {
+		hdev->device_cpu_disabled = false;
+		hdev->hard_reset_pending = false;
+
+		if (hdev->kernel_ctx) {
+			dev_crit(hdev->dev,
+				"kernel ctx was alive during hard reset, something is terribly wrong\n");
+			rc = -EBUSY;
+			goto out_err;
+		}
+
+		rc = hl_mmu_init(hdev);
+		if (rc) {
+			dev_err(hdev->dev,
+				"Failed to initialize MMU S/W after hard reset\n");
+			goto out_err;
+		}
+
+		/* Allocate the kernel context */
+		hdev->kernel_ctx = kzalloc(sizeof(*hdev->kernel_ctx),
+						GFP_KERNEL);
+		if (!hdev->kernel_ctx) {
+			rc = -ENOMEM;
+			hl_mmu_fini(hdev);
+			goto out_err;
+		}
+
+		hdev->compute_ctx = NULL;
+
+		rc = hl_ctx_init(hdev, hdev->kernel_ctx, true);
+		if (rc) {
+			dev_err(hdev->dev,
+				"failed to init kernel ctx in hard reset\n");
+			kfree(hdev->kernel_ctx);
+			hdev->kernel_ctx = NULL;
+			hl_mmu_fini(hdev);
+			goto out_err;
+		}
+	}
+
+	/* Device is now enabled as part of the initialization requires
+	 * communication with the device firmware to get information that
+	 * is required for the initialization itself
+	 */
+	hdev->disabled = false;
+
+	rc = hdev->asic_funcs->hw_init(hdev);
+	if (rc) {
+		dev_err(hdev->dev,
+			"failed to initialize the H/W after reset\n");
+		goto out_err;
+	}
+
+	/* Check that the communication with the device is working */
+	rc = hdev->asic_funcs->test_queues(hdev);
+	if (rc) {
+		dev_err(hdev->dev,
+			"Failed to detect if device is alive after reset\n");
+		goto out_err;
+	}
+
+	if (hard_reset) {
+		rc = device_late_init(hdev);
+		if (rc) {
+			dev_err(hdev->dev,
+				"Failed late init after hard reset\n");
+			goto out_err;
+		}
+
+		rc = hl_vm_init(hdev);
+		if (rc) {
+			dev_err(hdev->dev,
+				"Failed to init memory module after hard reset\n");
+			goto out_err;
+		}
+
+		hl_set_max_power(hdev);
+	} else {
+		rc = hdev->asic_funcs->soft_reset_late_init(hdev);
+		if (rc) {
+			dev_err(hdev->dev,
+				"Failed late init after soft reset\n");
+			goto out_err;
+		}
+	}
+
+	atomic_set(&hdev->in_reset, 0);
+
+	if (hard_reset)
+		hdev->hard_reset_cnt++;
+	else
+		hdev->soft_reset_cnt++;
+
+	dev_warn(hdev->dev, "Successfully finished resetting the device\n");
+
+	return 0;
+
+out_err:
+	hdev->disabled = true;
+
+	if (hard_reset) {
+		dev_err(hdev->dev,
+			"Failed to reset! Device is NOT usable\n");
+		hdev->hard_reset_cnt++;
+	} else {
+		dev_err(hdev->dev,
+			"Failed to do soft-reset, trying hard reset\n");
+		hdev->soft_reset_cnt++;
+		hard_reset = true;
+		goto again;
+	}
+
+	atomic_set(&hdev->in_reset, 0);
+
+	return rc;
+}
+
+/*
+ * hl_device_init - main initialization function for habanalabs device
+ *
+ * @hdev: pointer to habanalabs device structure
+ *
+ * Allocate an id for the device, do early initialization and then call the
+ * ASIC specific initialization functions. Finally, create the cdev and the
+ * Linux device to expose it to the user
+ */
+int hl_device_init(struct hl_device *hdev, struct class *hclass)
+{
+	int i, rc, cq_cnt, cq_ready_cnt;
+	char *name;
+	bool add_cdev_sysfs_on_err = false;
+
+	name = kasprintf(GFP_KERNEL, "hl%d", hdev->id / 2);
+	if (!name) {
+		rc = -ENOMEM;
+		goto out_disabled;
+	}
+
+	/* Initialize cdev and device structures */
+	rc = device_init_cdev(hdev, hclass, hdev->id, &hl_ops, name,
+				&hdev->cdev, &hdev->dev);
+
+	kfree(name);
+
+	if (rc)
+		goto out_disabled;
+
+	name = kasprintf(GFP_KERNEL, "hl_controlD%d", hdev->id / 2);
+	if (!name) {
+		rc = -ENOMEM;
+		goto free_dev;
+	}
+
+	/* Initialize cdev and device structures for control device */
+	rc = device_init_cdev(hdev, hclass, hdev->id_control, &hl_ctrl_ops,
+				name, &hdev->cdev_ctrl, &hdev->dev_ctrl);
+
+	kfree(name);
+
+	if (rc)
+		goto free_dev;
+
+	/* Initialize ASIC function pointers and perform early init */
+	rc = device_early_init(hdev);
+	if (rc)
+		goto free_dev_ctrl;
+
+	/*
+	 * Start calling ASIC initialization. First S/W then H/W and finally
+	 * late init
+	 */
+	rc = hdev->asic_funcs->sw_init(hdev);
+	if (rc)
+		goto early_fini;
+
+	/*
+	 * Initialize the H/W queues. Must be done before hw_init, because
+	 * there the addresses of the kernel queue are being written to the
+	 * registers of the device
+	 */
+	rc = hl_hw_queues_create(hdev);
+	if (rc) {
+		dev_err(hdev->dev, "failed to initialize kernel queues\n");
+		goto sw_fini;
+	}
+
+	cq_cnt = hdev->asic_prop.completion_queues_count;
+
+	/*
+	 * Initialize the completion queues. Must be done before hw_init,
+	 * because there the addresses of the completion queues are being
+	 * passed as arguments to request_irq
+	 */
+	if (cq_cnt) {
+		hdev->completion_queue = kcalloc(cq_cnt,
+				sizeof(*hdev->completion_queue),
+				GFP_KERNEL);
+
+		if (!hdev->completion_queue) {
+			dev_err(hdev->dev,
+				"failed to allocate completion queues\n");
+			rc = -ENOMEM;
+			goto hw_queues_destroy;
+		}
+	}
+
+	for (i = 0, cq_ready_cnt = 0 ; i < cq_cnt ; i++, cq_ready_cnt++) {
+		rc = hl_cq_init(hdev, &hdev->completion_queue[i],
+				hdev->asic_funcs->get_queue_id_for_cq(hdev, i));
+		if (rc) {
+			dev_err(hdev->dev,
+				"failed to initialize completion queue\n");
+			goto cq_fini;
+		}
+		hdev->completion_queue[i].cq_idx = i;
+	}
+
+	/*
+	 * Initialize the event queue. Must be done before hw_init,
+	 * because there the address of the event queue is being
+	 * passed as argument to request_irq
+	 */
+	rc = hl_eq_init(hdev, &hdev->event_queue);
+	if (rc) {
+		dev_err(hdev->dev, "failed to initialize event queue\n");
+		goto cq_fini;
+	}
+
+	/* MMU S/W must be initialized before kernel context is created */
+	rc = hl_mmu_init(hdev);
+	if (rc) {
+		dev_err(hdev->dev, "Failed to initialize MMU S/W structures\n");
+		goto eq_fini;
+	}
+
+	/* Allocate the kernel context */
+	hdev->kernel_ctx = kzalloc(sizeof(*hdev->kernel_ctx), GFP_KERNEL);
+	if (!hdev->kernel_ctx) {
+		rc = -ENOMEM;
+		goto mmu_fini;
+	}
+
+	hdev->compute_ctx = NULL;
+
+	rc = hl_ctx_init(hdev, hdev->kernel_ctx, true);
+	if (rc) {
+		dev_err(hdev->dev, "failed to initialize kernel context\n");
+		kfree(hdev->kernel_ctx);
+		goto mmu_fini;
+	}
+
+	rc = hl_cb_pool_init(hdev);
+	if (rc) {
+		dev_err(hdev->dev, "failed to initialize CB pool\n");
+		goto release_ctx;
+	}
+
+	hl_debugfs_add_device(hdev);
+
+	if (hdev->asic_funcs->get_hw_state(hdev) == HL_DEVICE_HW_STATE_DIRTY) {
+		dev_info(hdev->dev,
+			"H/W state is dirty, must reset before initializing\n");
+		hdev->asic_funcs->halt_engines(hdev, true);
+		hdev->asic_funcs->hw_fini(hdev, true);
+	}
+
+	/*
+	 * From this point, in case of an error, add char devices and create
+	 * sysfs nodes as part of the error flow, to allow debugging.
+	 */
+	add_cdev_sysfs_on_err = true;
+
+	/* Device is now enabled as part of the initialization requires
+	 * communication with the device firmware to get information that
+	 * is required for the initialization itself
+	 */
+	hdev->disabled = false;
+
+	rc = hdev->asic_funcs->hw_init(hdev);
+	if (rc) {
+		dev_err(hdev->dev, "failed to initialize the H/W\n");
+		rc = 0;
+		goto out_disabled;
+	}
+
+	/* Check that the communication with the device is working */
+	rc = hdev->asic_funcs->test_queues(hdev);
+	if (rc) {
+		dev_err(hdev->dev, "Failed to detect if device is alive\n");
+		rc = 0;
+		goto out_disabled;
+	}
+
+	rc = device_late_init(hdev);
+	if (rc) {
+		dev_err(hdev->dev, "Failed late initialization\n");
+		rc = 0;
+		goto out_disabled;
+	}
+
+	dev_info(hdev->dev, "Found %s device with %lluGB DRAM\n",
+		hdev->asic_name,
+		hdev->asic_prop.dram_size / 1024 / 1024 / 1024);
+
+	rc = hl_vm_init(hdev);
+	if (rc) {
+		dev_err(hdev->dev, "Failed to initialize memory module\n");
+		rc = 0;
+		goto out_disabled;
+	}
+
+	/*
+	 * Expose devices and sysfs nodes to user.
+	 * From here there is no need to add char devices and create sysfs nodes
+	 * in case of an error.
+	 */
+	add_cdev_sysfs_on_err = false;
+	rc = device_cdev_sysfs_add(hdev);
+	if (rc) {
+		dev_err(hdev->dev,
+			"Failed to add char devices and sysfs nodes\n");
+		rc = 0;
+		goto out_disabled;
+	}
+
+	/* Need to call this again because the max power might change,
+	 * depending on card type for certain ASICs
+	 */
+	hl_set_max_power(hdev);
+
+	/*
+	 * hl_hwmon_init() must be called after device_late_init(), because only
+	 * there we get the information from the device about which
+	 * hwmon-related sensors the device supports.
+	 * Furthermore, it must be done after adding the device to the system.
+	 */
+	rc = hl_hwmon_init(hdev);
+	if (rc) {
+		dev_err(hdev->dev, "Failed to initialize hwmon\n");
+		rc = 0;
+		goto out_disabled;
+	}
+
+	dev_notice(hdev->dev,
+		"Successfully added device to habanalabs driver\n");
+
+	hdev->init_done = true;
+
+	return 0;
+
+release_ctx:
+	if (hl_ctx_put(hdev->kernel_ctx) != 1)
+		dev_err(hdev->dev,
+			"kernel ctx is still alive on initialization failure\n");
+mmu_fini:
+	hl_mmu_fini(hdev);
+eq_fini:
+	hl_eq_fini(hdev, &hdev->event_queue);
+cq_fini:
+	for (i = 0 ; i < cq_ready_cnt ; i++)
+		hl_cq_fini(hdev, &hdev->completion_queue[i]);
+	kfree(hdev->completion_queue);
+hw_queues_destroy:
+	hl_hw_queues_destroy(hdev);
+sw_fini:
+	hdev->asic_funcs->sw_fini(hdev);
+early_fini:
+	device_early_fini(hdev);
+free_dev_ctrl:
+	put_device(hdev->dev_ctrl);
+free_dev:
+	put_device(hdev->dev);
+out_disabled:
+	hdev->disabled = true;
+	if (add_cdev_sysfs_on_err)
+		device_cdev_sysfs_add(hdev);
+	if (hdev->pdev)
+		dev_err(&hdev->pdev->dev,
+			"Failed to initialize hl%d. Device is NOT usable !\n",
+			hdev->id / 2);
+	else
+		pr_err("Failed to initialize hl%d. Device is NOT usable !\n",
+			hdev->id / 2);
+
+	return rc;
+}
+
+/*
+ * hl_device_fini - main tear-down function for habanalabs device
+ *
+ * @hdev: pointer to habanalabs device structure
+ *
+ * Destroy the device, call ASIC fini functions and release the id
+ */
+void hl_device_fini(struct hl_device *hdev)
+{
+	int i, rc;
+	ktime_t timeout;
+
+	dev_info(hdev->dev, "Removing device\n");
+
+	/*
+	 * This function is competing with the reset function, so try to
+	 * take the reset atomic and if we are already in middle of reset,
+	 * wait until reset function is finished. Reset function is designed
+	 * to always finish. However, in Gaudi, because of all the network
+	 * ports, the hard reset could take between 10-30 seconds
+	 */
+
+	timeout = ktime_add_us(ktime_get(),
+				HL_HARD_RESET_MAX_TIMEOUT * 1000 * 1000);
+	rc = atomic_cmpxchg(&hdev->in_reset, 0, 1);
+	while (rc) {
+		usleep_range(50, 200);
+		rc = atomic_cmpxchg(&hdev->in_reset, 0, 1);
+		if (ktime_compare(ktime_get(), timeout) > 0) {
+			WARN(1, "Failed to remove device because reset function did not finish\n");
+			return;
+		}
+	}
+
+	/* Disable PCI access from device F/W so it won't send us additional
+	 * interrupts. We disable MSI/MSI-X at the halt_engines function and we
+	 * can't have the F/W sending us interrupts after that. We need to
+	 * disable the access here because if the device is marked disable, the
+	 * message won't be send. Also, in case of heartbeat, the device CPU is
+	 * marked as disable so this message won't be sent
+	 */
+	hl_fw_send_pci_access_msg(hdev,	CPUCP_PACKET_DISABLE_PCI_ACCESS);
+
+	/* Mark device as disabled */
+	hdev->disabled = true;
+
+	/* Flush anyone that is inside the critical section of enqueue
+	 * jobs to the H/W
+	 */
+	hdev->asic_funcs->hw_queues_lock(hdev);
+	hdev->asic_funcs->hw_queues_unlock(hdev);
+
+	/* Flush anyone that is inside device open */
+	mutex_lock(&hdev->fpriv_list_lock);
+	mutex_unlock(&hdev->fpriv_list_lock);
+
+	hdev->hard_reset_pending = true;
+
+	hl_hwmon_fini(hdev);
+
+	device_late_fini(hdev);
+
+	hl_debugfs_remove_device(hdev);
+
+	/*
+	 * Halt the engines and disable interrupts so we won't get any more
+	 * completions from H/W and we won't have any accesses from the
+	 * H/W to the host machine
+	 */
+	hdev->asic_funcs->halt_engines(hdev, true);
+
+	/* Go over all the queues, release all CS and their jobs */
+	hl_cs_rollback_all(hdev);
+
+	/* Kill processes here after CS rollback. This is because the process
+	 * can't really exit until all its CSs are done, which is what we
+	 * do in cs rollback
+	 */
+	rc = device_kill_open_processes(hdev);
+	if (rc)
+		dev_crit(hdev->dev, "Failed to kill all open processes\n");
+
+	hl_cb_pool_fini(hdev);
+
+	/* Reset the H/W. It will be in idle state after this returns */
+	hdev->asic_funcs->hw_fini(hdev, true);
+
+	/* Release kernel context */
+	if ((hdev->kernel_ctx) && (hl_ctx_put(hdev->kernel_ctx) != 1))
+		dev_err(hdev->dev, "kernel ctx is still alive\n");
+
+	hl_vm_fini(hdev);
+
+	hl_mmu_fini(hdev);
+
+	hl_eq_fini(hdev, &hdev->event_queue);
+
+	for (i = 0 ; i < hdev->asic_prop.completion_queues_count ; i++)
+		hl_cq_fini(hdev, &hdev->completion_queue[i]);
+	kfree(hdev->completion_queue);
+
+	hl_hw_queues_destroy(hdev);
+
+	/* Call ASIC S/W finalize function */
+	hdev->asic_funcs->sw_fini(hdev);
+
+	device_early_fini(hdev);
+
+	/* Hide devices and sysfs nodes from user */
+	device_cdev_sysfs_del(hdev);
+
+	pr_info("removed device successfully\n");
+}
+
+/*
+ * MMIO register access helper functions.
+ */
+
+/*
+ * hl_rreg - Read an MMIO register
+ *
+ * @hdev: pointer to habanalabs device structure
+ * @reg: MMIO register offset (in bytes)
+ *
+ * Returns the value of the MMIO register we are asked to read
+ *
+ */
+inline u32 hl_rreg(struct hl_device *hdev, u32 reg)
+{
+	return readl(hdev->rmmio + reg);
+}
+
+/*
+ * hl_wreg - Write to an MMIO register
+ *
+ * @hdev: pointer to habanalabs device structure
+ * @reg: MMIO register offset (in bytes)
+ * @val: 32-bit value
+ *
+ * Writes the 32-bit value into the MMIO register
+ *
+ */
+inline void hl_wreg(struct hl_device *hdev, u32 reg, u32 val)
+{
+	writel(val, hdev->rmmio + reg);
+}