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device.c
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device.c
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// 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/hwmon.h>
#include <uapi/misc/habanalabs.h>
enum hl_device_status hl_device_status(struct hl_device *hdev)
{
enum hl_device_status status;
if (atomic_read(&hdev->in_reset))
status = HL_DEVICE_STATUS_IN_RESET;
else if (hdev->needs_reset)
status = HL_DEVICE_STATUS_NEEDS_RESET;
else if (hdev->disabled)
status = HL_DEVICE_STATUS_MALFUNCTION;
else
status = HL_DEVICE_STATUS_OPERATIONAL;
return status;
}
bool hl_device_operational(struct hl_device *hdev,
enum hl_device_status *status)
{
enum hl_device_status current_status;
current_status = hl_device_status(hdev);
if (status)
*status = current_status;
switch (current_status) {
case HL_DEVICE_STATUS_IN_RESET:
case HL_DEVICE_STATUS_MALFUNCTION:
case HL_DEVICE_STATUS_NEEDS_RESET:
return false;
case HL_DEVICE_STATUS_OPERATIONAL:
default:
return true;
}
}
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);
if (hdev->reset_upon_device_release)
hl_device_reset(hdev, 0);
}
void hl_hpriv_get(struct hl_fpriv *hpriv)
{
kref_get(&hpriv->refcount);
}
int hl_hpriv_put(struct hl_fpriv *hpriv)
{
return 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;
struct hl_device *hdev = hpriv->hdev;
filp->private_data = NULL;
if (!hdev) {
pr_crit("Closing FD after device was removed. Memory leak will occur and it is advised to reboot.\n");
put_pid(hpriv->taskpid);
return 0;
}
/* Each pending user interrupt holds the user's context, hence we
* must release them all before calling hl_ctx_mgr_fini().
*/
hl_release_pending_user_interrupts(hpriv->hdev);
hl_cb_mgr_fini(hdev, &hpriv->cb_mgr);
hl_ctx_mgr_fini(hdev, &hpriv->ctx_mgr);
if (!hl_hpriv_put(hpriv))
dev_warn(hdev->dev,
"Device is still in use because there are live CS and/or memory mappings\n");
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 = hpriv->hdev;
filp->private_data = NULL;
if (!hdev) {
pr_err("Closing FD after device was removed\n");
goto out;
}
mutex_lock(&hdev->fpriv_list_lock);
list_del(&hpriv->dev_node);
mutex_unlock(&hdev->fpriv_list_lock);
out:
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;
struct hl_device *hdev = hpriv->hdev;
unsigned long vm_pgoff;
if (!hdev) {
pr_err_ratelimited("Trying to mmap after device was removed! Please close FD\n");
return -ENODEV;
}
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);
case HL_MMAP_TYPE_BLOCK:
return hl_hw_block_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);
}
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.work);
struct hl_device *hdev = device_reset_work->hdev;
int rc;
rc = hl_device_reset(hdev, HL_RESET_HARD | HL_RESET_FROM_RESET_THREAD);
if ((rc == -EBUSY) && !hdev->device_fini_pending) {
dev_info(hdev->dev,
"Could not reset device. will try again in %u seconds",
HL_PENDING_RESET_PER_SEC);
queue_delayed_work(device_reset_work->wq,
&device_reset_work->reset_work,
msecs_to_jiffies(HL_PENDING_RESET_PER_SEC * 1000));
}
}
/*
* 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);
strscpy(hdev->asic_name, "GOYA", sizeof(hdev->asic_name));
break;
case ASIC_GAUDI:
gaudi_set_asic_funcs(hdev);
strscpy(hdev->asic_name, "GAUDI", sizeof(hdev->asic_name));
break;
case ASIC_GAUDI_SEC:
gaudi_set_asic_funcs(hdev);
strscpy(hdev->asic_name, "GAUDI SEC", sizeof(hdev->asic_name));
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_KERNEL);
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->sob_reset_wq = alloc_workqueue("hl-sob-reset", WQ_UNBOUND, 0);
if (!hdev->sob_reset_wq) {
dev_err(hdev->dev,
"Failed to allocate SOB reset workqueue\n");
rc = -ENOMEM;
goto free_eq_wq;
}
hdev->hl_chip_info = kzalloc(sizeof(struct hwmon_chip_info),
GFP_KERNEL);
if (!hdev->hl_chip_info) {
rc = -ENOMEM;
goto free_sob_reset_wq;
}
rc = hl_mmu_if_set_funcs(hdev);
if (rc)
goto free_chip_info;
hl_cb_mgr_init(&hdev->kernel_cb_mgr);
hdev->device_reset_work.wq =
create_singlethread_workqueue("hl_device_reset");
if (!hdev->device_reset_work.wq) {
rc = -ENOMEM;
dev_err(hdev->dev, "Failed to create device reset WQ\n");
goto free_cb_mgr;
}
INIT_DELAYED_WORK(&hdev->device_reset_work.reset_work,
device_hard_reset_pending);
hdev->device_reset_work.hdev = hdev;
hdev->device_fini_pending = 0;
mutex_init(&hdev->send_cpu_message_lock);
mutex_init(&hdev->debug_lock);
INIT_LIST_HEAD(&hdev->cs_mirror_list);
spin_lock_init(&hdev->cs_mirror_lock);
INIT_LIST_HEAD(&hdev->fpriv_list);
mutex_init(&hdev->fpriv_list_lock);
atomic_set(&hdev->in_reset, 0);
return 0;
free_cb_mgr:
hl_cb_mgr_fini(hdev, &hdev->kernel_cb_mgr);
free_chip_info:
kfree(hdev->hl_chip_info);
free_sob_reset_wq:
destroy_workqueue(hdev->sob_reset_wq);
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->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->hl_chip_info);
destroy_workqueue(hdev->sob_reset_wq);
destroy_workqueue(hdev->eq_wq);
destroy_workqueue(hdev->device_reset_work.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_operational(hdev, NULL))
goto reschedule;
if (!hdev->asic_funcs->send_heartbeat(hdev))
goto reschedule;
dev_err(hdev->dev, "Device heartbeat failed!\n");
hl_device_reset(hdev, HL_RESET_HARD | HL_RESET_HEARTBEAT);
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;
}
int hl_device_utilization(struct hl_device *hdev, u32 *utilization)
{
u64 max_power, curr_power, dc_power, dividend;
int rc;
max_power = hdev->asic_prop.max_power_default;
dc_power = hdev->asic_prop.dc_power_default;
rc = hl_fw_cpucp_power_get(hdev, &curr_power);
if (rc)
return rc;
curr_power = clamp(curr_power, dc_power, max_power);
dividend = (curr_power - dc_power) * 100;
*utilization = (u32) div_u64(dividend, (max_power - dc_power));
return 0;
}
/*
* 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, HL_RESET_HARD);
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, u32 timeout)
{
struct hl_fpriv *hpriv;
struct task_struct *task = NULL;
u32 pending_cnt;
/* 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);
if (timeout) {
pending_cnt = timeout;
} else {
if (hdev->process_kill_trial_cnt) {
/* Processes have been already killed */
pending_cnt = 1;
goto wait_for_processes;
} else {
/* Wait a small period after process kill */
pending_cnt = HL_PENDING_RESET_PER_SEC;
}
}
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 that doesn't mean they are closed.
* It could be that they are running a long cleanup phase in the driver
* e.g. MMU unmappings, or running other long teardown flow even before
* our cleanup.
* Therefore we need to wait again to make sure they are closed before
* continuing with the reset.
*/
wait_for_processes:
while ((!list_empty(&hdev->fpriv_list)) && (pending_cnt)) {
dev_dbg(hdev->dev,
"Waiting for all unmap operations to finish before hard reset\n");
pending_cnt--;
ssleep(1);
}
/* All processes exited successfully */
if (list_empty(&hdev->fpriv_list))
return 0;
/* Give up waiting for processes to exit */
if (hdev->process_kill_trial_cnt == HL_PENDING_RESET_MAX_TRIALS)
return -ETIME;
hdev->process_kill_trial_cnt++;
return -EBUSY;
}
static void device_disable_open_processes(struct hl_device *hdev)
{
struct hl_fpriv *hpriv;
mutex_lock(&hdev->fpriv_list_lock);
list_for_each_entry(hpriv, &hdev->fpriv_list, dev_node)
hpriv->hdev = NULL;
mutex_unlock(&hdev->fpriv_list_lock);
}
/*
* hl_device_reset - reset the device
*
* @hdev: pointer to habanalabs device structure
* @flags: reset flags.
*
* 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, u32 flags)
{
u64 idle_mask[HL_BUSY_ENGINES_MASK_EXT_SIZE] = {0};
bool hard_reset, 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;
}
hard_reset = (flags & HL_RESET_HARD) != 0;
from_hard_reset_thread = (flags & HL_RESET_FROM_RESET_THREAD) != 0;
if ((!hard_reset) && (!hdev->supports_soft_reset)) {
dev_dbg(hdev->dev, "Doing hard-reset instead of soft-reset\n");
hard_reset = true;
}
/* Re-entry of reset thread */
if (from_hard_reset_thread && hdev->process_kill_trial_cnt)
goto kill_processes;
/*
* 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 reset is due to heartbeat, device CPU is no responsive in
* which case no point sending PCI disable message to it
*/
if (hard_reset && !(flags & HL_RESET_HEARTBEAT)) {
/* 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)) {
hdev->hard_reset_pending = true;
hdev->process_kill_trial_cnt = 0;
/*
* Because the reset function can't run from interrupt or
* from heartbeat work, we need to call the reset function
* from a dedicated work
*/
queue_delayed_work(hdev->device_reset_work.wq,
&hdev->device_reset_work.reset_work, 0);
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);
/* Release all pending user interrupts, each pending user interrupt
* holds a reference to user context
*/
hl_release_pending_user_interrupts(hdev);
kill_processes:
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, 0);
if (rc == -EBUSY) {
if (hdev->device_fini_pending) {
dev_crit(hdev->dev,
"Failed to kill all open processes, stopping hard reset\n");
goto out_err;
}
/* signal reset thread to reschedule */
return rc;
}