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|
// SPDX-License-Identifier: GPL-2.0
/*
* Copyright 2016-2021 HabanaLabs, Ltd.
* All Rights Reserved.
*
*/
#define pr_fmt(fmt) "habanalabs: " fmt
#include "habanalabs.h"
#include "../include/hw_ip/pci/pci_general.h"
#include <linux/pci.h>
#include <linux/module.h>
#include <linux/vmalloc.h>
#include <linux/version.h>
#include <drm/drm_accel.h>
#include <drm/drm_drv.h>
#include <drm/drm_ioctl.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 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);
static const struct drm_ioctl_desc hl_drm_ioctls[] = {
DRM_IOCTL_DEF_DRV(HL_INFO, hl_info_ioctl, 0),
DRM_IOCTL_DEF_DRV(HL_CB, hl_cb_ioctl, 0),
DRM_IOCTL_DEF_DRV(HL_CS, hl_cs_ioctl, 0),
DRM_IOCTL_DEF_DRV(HL_WAIT_CS, hl_wait_ioctl, 0),
DRM_IOCTL_DEF_DRV(HL_MEMORY, hl_mem_ioctl, 0),
DRM_IOCTL_DEF_DRV(HL_DEBUG, hl_debug_ioctl, 0),
};
static const struct file_operations hl_fops = {
.owner = THIS_MODULE,
.open = accel_open,
.release = drm_release,
.unlocked_ioctl = drm_ioctl,
.compat_ioctl = drm_compat_ioctl,
.llseek = noop_llseek,
.mmap = hl_mmap
};
static const struct drm_driver hl_driver = {
.driver_features = DRIVER_COMPUTE_ACCEL,
.name = HL_NAME,
.desc = HL_DRIVER_DESC,
.major = LINUX_VERSION_MAJOR,
.minor = LINUX_VERSION_PATCHLEVEL,
.patchlevel = LINUX_VERSION_SUBLEVEL,
.date = "20190505",
.fops = &hl_fops,
.open = hl_device_open,
.postclose = hl_device_release,
.ioctls = hl_drm_ioctls,
.num_ioctls = ARRAY_SIZE(hl_drm_ioctls)
};
/*
* get_asic_type - translate device id to asic type
*
* @hdev: pointer to habanalabs device structure.
*
* Translate device id and revision id to asic type.
* In case of unidentified device, return -1
*/
static enum hl_asic_type get_asic_type(struct hl_device *hdev)
{
struct pci_dev *pdev = hdev->pdev;
enum hl_asic_type asic_type = ASIC_INVALID;
switch (pdev->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:
switch (pdev->revision) {
case REV_ID_A:
asic_type = ASIC_GAUDI2;
break;
case REV_ID_B:
asic_type = ASIC_GAUDI2B;
break;
default:
break;
}
break;
default:
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.
* @ddev: pointer to DRM device structure.
* @file: pointer to DRM file private data structure.
*
* Called when process opens an habanalabs device.
*/
int hl_device_open(struct drm_device *ddev, struct drm_file *file_priv)
{
struct hl_device *hdev = to_hl_device(ddev);
enum hl_device_status status;
struct hl_fpriv *hpriv;
int rc;
hpriv = kzalloc(sizeof(*hpriv), GFP_KERNEL);
if (!hpriv)
return -ENOMEM;
hpriv->hdev = hdev;
mutex_init(&hpriv->notifier_event.lock);
mutex_init(&hpriv->restore_phase_mutex);
mutex_init(&hpriv->ctx_lock);
kref_init(&hpriv->refcount);
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);
hl_enable_err_info_capture(&hdev->captured_err_info);
hdev->open_counter++;
hdev->last_successful_open_jif = jiffies;
hdev->last_successful_open_ktime = ktime_get();
file_priv->driver_priv = hpriv;
hpriv->file_priv = file_priv;
return 0;
out_err:
mutex_unlock(&hdev->fpriv_list_lock);
hl_mem_mgr_fini(&hpriv->mem_mgr);
hl_mem_mgr_idr_destroy(&hpriv->mem_mgr);
hl_ctx_mgr_fini(hpriv->hdev, &hpriv->ctx_mgr);
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;
nonseekable_open(inode, filp);
hpriv->taskpid = get_task_pid(current, PIDTYPE_PID);
mutex_lock(&hdev->fpriv_ctrl_list_lock);
if (!hl_ctrl_device_operational(hdev, NULL)) {
dev_dbg_ratelimited(hdev->dev_ctrl,
"Can't open %s because it is disabled\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->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;
}
static int allocate_device_id(struct hl_device *hdev)
{
int id;
mutex_lock(&hl_devs_idr_lock);
id = idr_alloc(&hl_devs_idr, hdev, 0, HL_MAX_MINORS, GFP_KERNEL);
mutex_unlock(&hl_devs_idr_lock);
if (id < 0) {
if (id == -ENOSPC)
pr_err("too many devices in the system\n");
return -EBUSY;
}
hdev->id = id;
/*
* Firstly initialized with the internal device ID.
* Will be updated later after the DRM device registration to hold the minor ID.
*/
hdev->cdev_idx = hdev->id;
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)
{
struct hl_device *hdev;
int rc;
*dev = NULL;
hdev = devm_drm_dev_alloc(&pdev->dev, &hl_driver, struct hl_device, drm);
if (IS_ERR(hdev))
return PTR_ERR(hdev);
hdev->dev = hdev->drm.dev;
/* Will be NULL in case of simulator device */
hdev->pdev = pdev;
/* Assign status description string */
strscpy(hdev->status[HL_DEVICE_STATUS_OPERATIONAL], "operational", HL_STR_MAX);
strscpy(hdev->status[HL_DEVICE_STATUS_IN_RESET], "in reset", HL_STR_MAX);
strscpy(hdev->status[HL_DEVICE_STATUS_MALFUNCTION], "disabled", HL_STR_MAX);
strscpy(hdev->status[HL_DEVICE_STATUS_NEEDS_RESET], "needs reset", HL_STR_MAX);
strscpy(hdev->status[HL_DEVICE_STATUS_IN_DEVICE_CREATION],
"in device creation", HL_STR_MAX);
strscpy(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(hdev);
if (hdev->asic_type == ASIC_INVALID) {
dev_err(&pdev->dev, "Unsupported ASIC\n");
rc = -ENODEV;
goto out_err;
}
copy_kernel_module_params_to_device(hdev);
set_driver_behavior_per_device(hdev);
fixup_device_params(hdev);
rc = allocate_device_id(hdev);
if (rc)
goto out_err;
*dev = hdev;
return 0;
out_err:
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);
mutex_unlock(&hl_devs_idr_lock);
}
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);
rc = hl_device_init(hdev);
if (rc) {
dev_err(&pdev->dev, "Fatal error during habanalabs device init\n");
rc = -ENODEV;
goto disable_device;
}
return 0;
disable_device:
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_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:
dev_warn(hdev->dev, "PCI normal state error detected\n");
return PCI_ERS_RESULT_CAN_RECOVER;
case pci_channel_io_frozen:
dev_warn(hdev->dev, "PCI frozen state error detected\n");
result = PCI_ERS_RESULT_NEED_RESET;
break;
case pci_channel_io_perm_failure:
dev_warn(hdev->dev, "PCI 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)
{
struct hl_device *hdev = pci_get_drvdata(pdev);
dev_warn(hdev->dev, "PCI slot reset detected\n");
return PCI_ERS_RESULT_RECOVERED;
}
static void hl_pci_reset_prepare(struct pci_dev *pdev)
{
struct hl_device *hdev;
hdev = pci_get_drvdata(pdev);
if (!hdev)
return;
hdev->disabled = true;
}
static void hl_pci_reset_done(struct pci_dev *pdev)
{
struct hl_device *hdev;
u32 flags;
hdev = pci_get_drvdata(pdev);
if (!hdev)
return;
/*
* Schedule a thread to trigger hard reset.
* The reason for this handler, is for rare cases where the driver is up
* and FLR occurs. This is valid only when working with no VM, so FW handles FLR
* and resets the device. FW will go back preboot stage, so driver needs to perform
* hard reset in order to load FW fit again.
*/
flags = HL_DRV_RESET_HARD | HL_DRV_RESET_BYPASS_REQ_TO_FW;
hl_device_reset(hdev, flags);
}
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,
.reset_prepare = hl_pci_reset_prepare,
.reset_done = hl_pci_reset_done,
};
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);
rc = pci_register_driver(&hl_pci_driver);
if (rc) {
pr_err("failed to register pci device\n");
goto remove_major;
}
pr_debug("driver loaded\n");
return 0;
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);
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);
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