blob: 91a9e47a3482505ca0a77d41a9e74db0fe032286 [file] [log] [blame]
// 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);
kfree(hpriv);
/* Now the FD is really closed */
atomic_dec(&hdev->fd_open_cnt);
/* This allows a new user context to open the device */
hdev->user_ctx = NULL;
}
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;
}
/*
* 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;
if ((vma->vm_pgoff & HL_MMAP_CB_MASK) == HL_MMAP_CB_MASK) {
vma->vm_pgoff ^= HL_MMAP_CB_MASK;
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
};
/*
* device_setup_cdev - setup 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
*
* Create a cdev and a Linux device for habanalabs's device. Need to be
* called at the end of the habanalabs device initialization process,
* because this function exposes the device to the user
*/
static int device_setup_cdev(struct hl_device *hdev, struct class *hclass,
int minor, const struct file_operations *fops)
{
int err, devno = MKDEV(hdev->major, minor);
struct cdev *hdev_cdev = &hdev->cdev;
char *name;
name = kasprintf(GFP_KERNEL, "hl%d", hdev->id);
if (!name)
return -ENOMEM;
cdev_init(hdev_cdev, fops);
hdev_cdev->owner = THIS_MODULE;
err = cdev_add(hdev_cdev, devno, 1);
if (err) {
pr_err("Failed to add char device %s\n", name);
goto err_cdev_add;
}
hdev->dev = device_create(hclass, NULL, devno, NULL, "%s", name);
if (IS_ERR(hdev->dev)) {
pr_err("Failed to create device %s\n", name);
err = PTR_ERR(hdev->dev);
goto err_device_create;
}
dev_set_drvdata(hdev->dev, hdev);
kfree(name);
return 0;
err_device_create:
cdev_del(hdev_cdev);
err_cdev_add:
kfree(name);
return err;
}
/*
* 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 rc;
switch (hdev->asic_type) {
case ASIC_GOYA:
goya_set_asic_funcs(hdev);
strlcpy(hdev->asic_name, "GOYA", 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;
hdev->cq_wq = alloc_workqueue("hl-free-jobs", WQ_UNBOUND, 0);
if (hdev->cq_wq == NULL) {
dev_err(hdev->dev, "Failed to allocate CQ workqueue\n");
rc = -ENOMEM;
goto asid_fini;
}
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;
}
hl_cb_mgr_init(&hdev->kernel_cb_mgr);
mutex_init(&hdev->fd_open_cnt_lock);
mutex_init(&hdev->send_cpu_message_lock);
INIT_LIST_HEAD(&hdev->hw_queues_mirror_list);
spin_lock_init(&hdev->hw_queues_mirror_lock);
atomic_set(&hdev->in_reset, 0);
atomic_set(&hdev->fd_open_cnt, 0);
atomic_set(&hdev->cs_active_cnt, 0);
return 0;
free_eq_wq:
destroy_workqueue(hdev->eq_wq);
free_cq_wq:
destroy_workqueue(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)
{
mutex_destroy(&hdev->send_cpu_message_lock);
hl_cb_mgr_fini(hdev, &hdev->kernel_cb_mgr);
kfree(hdev->hl_chip_info);
destroy_workqueue(hdev->eq_wq);
destroy_workqueue(hdev->cq_wq);
hl_asid_fini(hdev);
if (hdev->asic_funcs->early_fini)
hdev->asic_funcs->early_fini(hdev);
mutex_destroy(&hdev->fd_open_cnt_lock);
}
static void set_freq_to_low_job(struct work_struct *work)
{
struct hl_device *hdev = container_of(work, struct hl_device,
work_freq.work);
if (atomic_read(&hdev->fd_open_cnt) == 0)
hl_device_set_frequency(hdev, PLL_LOW);
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;
INIT_DELAYED_WORK(&hdev->work_freq, set_freq_to_low_job);
hdev->high_pll = hdev->asic_prop.high_pll;
/* force setting to low frequency */
atomic_set(&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);
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;
}
}
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;
}
/*
* 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.
* We allose to set PLL to low only if there is no user process
* Returns 0 if no change was done, otherwise returns 1;
*/
int hl_device_set_frequency(struct hl_device *hdev, enum hl_pll_frequency freq)
{
enum hl_pll_frequency old_freq =
(freq == PLL_HIGH) ? PLL_LOW : PLL_HIGH;
int ret;
if (hdev->pm_mng_profile == PM_MANUAL)
return 0;
ret = atomic_cmpxchg(&hdev->curr_pll_profile, old_freq, freq);
if (ret == freq)
return 0;
/*
* in case we want to lower frequency, check if device is not
* opened. We must have a check here to workaround race condition with
* hl_device_open
*/
if ((freq == PLL_LOW) && (atomic_read(&hdev->fd_open_cnt) > 0)) {
atomic_set(&hdev->curr_pll_profile, PLL_HIGH);
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);
return 1;
}
/*
* 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 void device_kill_open_processes(struct hl_device *hdev)
{
u16 pending_total, pending_cnt;
struct task_struct *task = NULL;
if (hdev->pldm)
pending_total = HL_PLDM_PENDING_RESET_PER_SEC;
else
pending_total = HL_PENDING_RESET_PER_SEC;
pending_cnt = pending_total;
/* Flush all processes that are inside hl_open */
mutex_lock(&hdev->fd_open_cnt_lock);
while ((atomic_read(&hdev->fd_open_cnt)) && (pending_cnt)) {
pending_cnt--;
dev_info(hdev->dev,
"Can't HARD reset, waiting for user to close FD\n");
ssleep(1);
}
if (atomic_read(&hdev->fd_open_cnt)) {
task = get_pid_task(hdev->user_ctx->hpriv->taskpid,
PIDTYPE_PID);
if (task) {
dev_info(hdev->dev, "Killing user processes\n");
send_sig(SIGKILL, task, 1);
msleep(100);
put_task_struct(task);
}
}
/* 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 ((atomic_read(&hdev->fd_open_cnt)) && (pending_cnt)) {
pending_cnt--;
ssleep(1);
}
if (atomic_read(&hdev->fd_open_cnt))
dev_crit(hdev->dev,
"Going to hard reset with open user contexts\n");
mutex_unlock(&hdev->fd_open_cnt_lock);
}
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;
device_kill_open_processes(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
*
* 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;
}
/*
* 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;
/* 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);
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;
if (!hdev->pdev) {
dev_err(hdev->dev,
"Reset action is NOT supported in simulator\n");
rc = -EINVAL;
goto out_err;
}
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);
/* Release kernel context */
if ((hard_reset) && (hl_ctx_put(hdev->kernel_ctx) == 1))
hdev->kernel_ctx = NULL;
/* Reset the H/W. It will be in idle state after this returns */
hdev->asic_funcs->hw_fini(hdev, hard_reset);
if (hard_reset) {
hl_vm_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]);
/* Make sure the context switch phase will run again */
if (hdev->user_ctx) {
atomic_set(&hdev->user_ctx->thread_ctx_switch_token, 1);
hdev->user_ctx->thread_ctx_switch_wait_token = 0;
}
/* 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;
}
/* Allocate the kernel context */
hdev->kernel_ctx = kzalloc(sizeof(*hdev->kernel_ctx),
GFP_KERNEL);
if (!hdev->kernel_ctx) {
rc = -ENOMEM;
goto out_err;
}
hdev->user_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;
goto out_err;
}
}
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;
}
hdev->disabled = false;
/* 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, hdev->max_power);
} 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++;
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_ready_cnt;
/* Create device */
rc = device_setup_cdev(hdev, hclass, hdev->id, &hl_ops);
if (rc)
goto out_disabled;
/* Initialize ASIC function pointers and perform early init */
rc = device_early_init(hdev);
if (rc)
goto release_device;
/*
* 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;
}
/*
* 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
*/
hdev->completion_queue =
kcalloc(hdev->asic_prop.completion_queues_count,
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 < hdev->asic_prop.completion_queues_count;
i++, cq_ready_cnt++) {
rc = hl_cq_init(hdev, &hdev->completion_queue[i], i);
if (rc) {
dev_err(hdev->dev,
"failed to initialize completion queue\n");
goto cq_fini;
}
}
/*
* 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;
}
/* Allocate the kernel context */
hdev->kernel_ctx = kzalloc(sizeof(*hdev->kernel_ctx), GFP_KERNEL);
if (!hdev->kernel_ctx) {
rc = -ENOMEM;
goto eq_fini;
}
hdev->user_ctx = NULL;
rc = hl_ctx_init(hdev, hdev->kernel_ctx, true);
if (rc) {
dev_err(hdev->dev, "failed to initialize kernel context\n");
goto free_ctx;
}
rc = hl_cb_pool_init(hdev);
if (rc) {
dev_err(hdev->dev, "failed to initialize CB pool\n");
goto release_ctx;
}
rc = hl_sysfs_init(hdev);
if (rc) {
dev_err(hdev->dev, "failed to initialize sysfs\n");
goto free_cb_pool;
}
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->hw_fini(hdev, true);
}
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;
}
hdev->disabled = false;
/* 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;
}
/* After test_queues, KMD can start sending messages to device CPU */
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;
}
/*
* 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
*/
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;
free_cb_pool:
hl_cb_pool_fini(hdev);
release_ctx:
if (hl_ctx_put(hdev->kernel_ctx) != 1)
dev_err(hdev->dev,
"kernel ctx is still alive on initialization failure\n");
free_ctx:
kfree(hdev->kernel_ctx);
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);
release_device:
device_destroy(hclass, hdev->dev->devt);
cdev_del(&hdev->cdev);
out_disabled:
hdev->disabled = true;
if (hdev->pdev)
dev_err(&hdev->pdev->dev,
"Failed to initialize hl%d. Device is NOT usable !\n",
hdev->id);
else
pr_err("Failed to initialize hl%d. Device is NOT usable !\n",
hdev->id);
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 (could take up to a few seconds in worst case).
*/
timeout = ktime_add_us(ktime_get(),
HL_PENDING_RESET_PER_SEC * 1000 * 1000 * 4);
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;
}
}
/* 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);
hdev->hard_reset_pending = true;
device_kill_open_processes(hdev);
hl_hwmon_fini(hdev);
device_late_fini(hdev);
hl_debugfs_remove_device(hdev);
hl_sysfs_fini(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);
hl_cb_pool_fini(hdev);
/* Release kernel context */
if ((hdev->kernel_ctx) && (hl_ctx_put(hdev->kernel_ctx) != 1))
dev_err(hdev->dev, "kernel ctx is still alive\n");
/* Reset the H/W. It will be in idle state after this returns */
hdev->asic_funcs->hw_fini(hdev, true);
hl_vm_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 device from user */
device_destroy(hdev->dev->class, hdev->dev->devt);
cdev_del(&hdev->cdev);
pr_info("removed device successfully\n");
}
/*
* hl_poll_timeout_memory - Periodically poll a host memory address
* until it is not zero or a timeout occurs
* @hdev: pointer to habanalabs device structure
* @addr: Address to poll
* @timeout_us: timeout in us
* @val: Variable to read the value into
*
* Returns 0 on success and -ETIMEDOUT upon a timeout. In either
* case, the last read value at @addr is stored in @val. Must not
* be called from atomic context if sleep_us or timeout_us are used.
*
* The function sleeps for 100us with timeout value of
* timeout_us
*/
int hl_poll_timeout_memory(struct hl_device *hdev, u64 addr,
u32 timeout_us, u32 *val)
{
/*
* address in this function points always to a memory location in the
* host's (server's) memory. That location is updated asynchronously
* either by the direct access of the device or by another core
*/
u32 *paddr = (u32 *) (uintptr_t) addr;
ktime_t timeout;
/* timeout should be longer when working with simulator */
if (!hdev->pdev)
timeout_us *= 10;
timeout = ktime_add_us(ktime_get(), timeout_us);
might_sleep();
for (;;) {
/*
* Flush CPU read/write buffers to make sure we read updates
* done by other cores or by the device
*/
mb();
*val = *paddr;
if (*val)
break;
if (ktime_compare(ktime_get(), timeout) > 0) {
*val = *paddr;
break;
}
usleep_range((100 >> 2) + 1, 100);
}
return *val ? 0 : -ETIMEDOUT;
}
/*
* hl_poll_timeout_devicememory - Periodically poll a device memory address
* until it is not zero or a timeout occurs
* @hdev: pointer to habanalabs device structure
* @addr: Device address to poll
* @timeout_us: timeout in us
* @val: Variable to read the value into
*
* Returns 0 on success and -ETIMEDOUT upon a timeout. In either
* case, the last read value at @addr is stored in @val. Must not
* be called from atomic context if sleep_us or timeout_us are used.
*
* The function sleeps for 100us with timeout value of
* timeout_us
*/
int hl_poll_timeout_device_memory(struct hl_device *hdev, void __iomem *addr,
u32 timeout_us, u32 *val)
{
ktime_t timeout = ktime_add_us(ktime_get(), timeout_us);
might_sleep();
for (;;) {
*val = readl(addr);
if (*val)
break;
if (ktime_compare(ktime_get(), timeout) > 0) {
*val = readl(addr);
break;
}
usleep_range((100 >> 2) + 1, 100);
}
return *val ? 0 : -ETIMEDOUT;
}
/*
* 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);
}