mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-26 00:35:35 +07:00
0878a42086
Hard-reset of our device should never fail, due to dangers of permanent damage to the H/W. This patch removes the last place in the reset path where the driver might exit before doing the actual reset. Signed-off-by: Oded Gabbay <oded.gabbay@gmail.com>
1201 lines
28 KiB
C
1201 lines
28 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Copyright 2016-2019 HabanaLabs, Ltd.
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* All Rights Reserved.
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*/
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#include "habanalabs.h"
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#include <linux/pci.h>
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#include <linux/sched/signal.h>
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#include <linux/hwmon.h>
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#define HL_PLDM_PENDING_RESET_PER_SEC (HL_PENDING_RESET_PER_SEC * 10)
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bool hl_device_disabled_or_in_reset(struct hl_device *hdev)
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{
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if ((hdev->disabled) || (atomic_read(&hdev->in_reset)))
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return true;
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else
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return false;
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}
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static void hpriv_release(struct kref *ref)
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{
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struct hl_fpriv *hpriv;
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struct hl_device *hdev;
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hpriv = container_of(ref, struct hl_fpriv, refcount);
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hdev = hpriv->hdev;
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put_pid(hpriv->taskpid);
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hl_debugfs_remove_file(hpriv);
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mutex_destroy(&hpriv->restore_phase_mutex);
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kfree(hpriv);
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/* Now the FD is really closed */
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atomic_dec(&hdev->fd_open_cnt);
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/* This allows a new user context to open the device */
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hdev->user_ctx = NULL;
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}
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void hl_hpriv_get(struct hl_fpriv *hpriv)
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{
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kref_get(&hpriv->refcount);
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}
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void hl_hpriv_put(struct hl_fpriv *hpriv)
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{
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kref_put(&hpriv->refcount, hpriv_release);
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}
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/*
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* hl_device_release - release function for habanalabs device
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*
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* @inode: pointer to inode structure
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* @filp: pointer to file structure
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*
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* Called when process closes an habanalabs device
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*/
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static int hl_device_release(struct inode *inode, struct file *filp)
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{
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struct hl_fpriv *hpriv = filp->private_data;
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hl_cb_mgr_fini(hpriv->hdev, &hpriv->cb_mgr);
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hl_ctx_mgr_fini(hpriv->hdev, &hpriv->ctx_mgr);
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filp->private_data = NULL;
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hl_hpriv_put(hpriv);
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return 0;
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}
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/*
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* hl_mmap - mmap function for habanalabs device
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*
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* @*filp: pointer to file structure
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* @*vma: pointer to vm_area_struct of the process
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*
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* Called when process does an mmap on habanalabs device. Call the device's mmap
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* function at the end of the common code.
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*/
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static int hl_mmap(struct file *filp, struct vm_area_struct *vma)
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{
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struct hl_fpriv *hpriv = filp->private_data;
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if ((vma->vm_pgoff & HL_MMAP_CB_MASK) == HL_MMAP_CB_MASK) {
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vma->vm_pgoff ^= HL_MMAP_CB_MASK;
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return hl_cb_mmap(hpriv, vma);
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}
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return -EINVAL;
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}
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static const struct file_operations hl_ops = {
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.owner = THIS_MODULE,
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.open = hl_device_open,
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.release = hl_device_release,
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.mmap = hl_mmap,
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.unlocked_ioctl = hl_ioctl,
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.compat_ioctl = hl_ioctl
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};
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/*
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* device_setup_cdev - setup cdev and device for habanalabs device
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*
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* @hdev: pointer to habanalabs device structure
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* @hclass: pointer to the class object of the device
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* @minor: minor number of the specific device
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* @fpos : file operations to install for this device
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*
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* Create a cdev and a Linux device for habanalabs's device. Need to be
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* called at the end of the habanalabs device initialization process,
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* because this function exposes the device to the user
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*/
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static int device_setup_cdev(struct hl_device *hdev, struct class *hclass,
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int minor, const struct file_operations *fops)
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{
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int err, devno = MKDEV(hdev->major, minor);
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struct cdev *hdev_cdev = &hdev->cdev;
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char *name;
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name = kasprintf(GFP_KERNEL, "hl%d", hdev->id);
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if (!name)
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return -ENOMEM;
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cdev_init(hdev_cdev, fops);
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hdev_cdev->owner = THIS_MODULE;
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err = cdev_add(hdev_cdev, devno, 1);
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if (err) {
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pr_err("Failed to add char device %s\n", name);
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goto err_cdev_add;
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}
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hdev->dev = device_create(hclass, NULL, devno, NULL, "%s", name);
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if (IS_ERR(hdev->dev)) {
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pr_err("Failed to create device %s\n", name);
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err = PTR_ERR(hdev->dev);
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goto err_device_create;
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}
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dev_set_drvdata(hdev->dev, hdev);
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kfree(name);
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return 0;
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err_device_create:
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cdev_del(hdev_cdev);
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err_cdev_add:
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kfree(name);
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return err;
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}
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/*
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* device_early_init - do some early initialization for the habanalabs device
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*
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* @hdev: pointer to habanalabs device structure
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*
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* Install the relevant function pointers and call the early_init function,
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* if such a function exists
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*/
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static int device_early_init(struct hl_device *hdev)
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{
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int rc;
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switch (hdev->asic_type) {
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case ASIC_GOYA:
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goya_set_asic_funcs(hdev);
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strlcpy(hdev->asic_name, "GOYA", sizeof(hdev->asic_name));
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break;
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default:
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dev_err(hdev->dev, "Unrecognized ASIC type %d\n",
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hdev->asic_type);
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return -EINVAL;
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}
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rc = hdev->asic_funcs->early_init(hdev);
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if (rc)
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return rc;
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rc = hl_asid_init(hdev);
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if (rc)
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goto early_fini;
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hdev->cq_wq = alloc_workqueue("hl-free-jobs", WQ_UNBOUND, 0);
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if (hdev->cq_wq == NULL) {
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dev_err(hdev->dev, "Failed to allocate CQ workqueue\n");
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rc = -ENOMEM;
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goto asid_fini;
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}
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hdev->eq_wq = alloc_workqueue("hl-events", WQ_UNBOUND, 0);
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if (hdev->eq_wq == NULL) {
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dev_err(hdev->dev, "Failed to allocate EQ workqueue\n");
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rc = -ENOMEM;
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goto free_cq_wq;
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}
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hdev->hl_chip_info = kzalloc(sizeof(struct hwmon_chip_info),
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GFP_KERNEL);
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if (!hdev->hl_chip_info) {
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rc = -ENOMEM;
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goto free_eq_wq;
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}
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hl_cb_mgr_init(&hdev->kernel_cb_mgr);
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mutex_init(&hdev->fd_open_cnt_lock);
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mutex_init(&hdev->send_cpu_message_lock);
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INIT_LIST_HEAD(&hdev->hw_queues_mirror_list);
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spin_lock_init(&hdev->hw_queues_mirror_lock);
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atomic_set(&hdev->in_reset, 0);
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atomic_set(&hdev->fd_open_cnt, 0);
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atomic_set(&hdev->cs_active_cnt, 0);
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return 0;
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free_eq_wq:
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destroy_workqueue(hdev->eq_wq);
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free_cq_wq:
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destroy_workqueue(hdev->cq_wq);
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asid_fini:
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hl_asid_fini(hdev);
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early_fini:
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if (hdev->asic_funcs->early_fini)
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hdev->asic_funcs->early_fini(hdev);
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return rc;
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}
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/*
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* device_early_fini - finalize all that was done in device_early_init
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*
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* @hdev: pointer to habanalabs device structure
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*
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*/
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static void device_early_fini(struct hl_device *hdev)
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{
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mutex_destroy(&hdev->send_cpu_message_lock);
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hl_cb_mgr_fini(hdev, &hdev->kernel_cb_mgr);
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kfree(hdev->hl_chip_info);
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destroy_workqueue(hdev->eq_wq);
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destroy_workqueue(hdev->cq_wq);
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hl_asid_fini(hdev);
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if (hdev->asic_funcs->early_fini)
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hdev->asic_funcs->early_fini(hdev);
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mutex_destroy(&hdev->fd_open_cnt_lock);
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}
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static void set_freq_to_low_job(struct work_struct *work)
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{
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struct hl_device *hdev = container_of(work, struct hl_device,
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work_freq.work);
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if (atomic_read(&hdev->fd_open_cnt) == 0)
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hl_device_set_frequency(hdev, PLL_LOW);
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schedule_delayed_work(&hdev->work_freq,
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usecs_to_jiffies(HL_PLL_LOW_JOB_FREQ_USEC));
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}
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static void hl_device_heartbeat(struct work_struct *work)
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{
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struct hl_device *hdev = container_of(work, struct hl_device,
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work_heartbeat.work);
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if (hl_device_disabled_or_in_reset(hdev))
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goto reschedule;
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if (!hdev->asic_funcs->send_heartbeat(hdev))
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goto reschedule;
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dev_err(hdev->dev, "Device heartbeat failed!\n");
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hl_device_reset(hdev, true, false);
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return;
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reschedule:
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schedule_delayed_work(&hdev->work_heartbeat,
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usecs_to_jiffies(HL_HEARTBEAT_PER_USEC));
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}
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/*
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* device_late_init - do late stuff initialization for the habanalabs device
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*
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* @hdev: pointer to habanalabs device structure
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*
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* Do stuff that either needs the device H/W queues to be active or needs
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* to happen after all the rest of the initialization is finished
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*/
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static int device_late_init(struct hl_device *hdev)
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{
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int rc;
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INIT_DELAYED_WORK(&hdev->work_freq, set_freq_to_low_job);
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hdev->high_pll = hdev->asic_prop.high_pll;
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/* force setting to low frequency */
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atomic_set(&hdev->curr_pll_profile, PLL_LOW);
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if (hdev->pm_mng_profile == PM_AUTO)
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hdev->asic_funcs->set_pll_profile(hdev, PLL_LOW);
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else
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hdev->asic_funcs->set_pll_profile(hdev, PLL_LAST);
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if (hdev->asic_funcs->late_init) {
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rc = hdev->asic_funcs->late_init(hdev);
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if (rc) {
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dev_err(hdev->dev,
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"failed late initialization for the H/W\n");
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return rc;
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}
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}
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schedule_delayed_work(&hdev->work_freq,
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usecs_to_jiffies(HL_PLL_LOW_JOB_FREQ_USEC));
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if (hdev->heartbeat) {
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INIT_DELAYED_WORK(&hdev->work_heartbeat, hl_device_heartbeat);
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schedule_delayed_work(&hdev->work_heartbeat,
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usecs_to_jiffies(HL_HEARTBEAT_PER_USEC));
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}
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hdev->late_init_done = true;
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return 0;
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}
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/*
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* device_late_fini - finalize all that was done in device_late_init
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*
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* @hdev: pointer to habanalabs device structure
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*
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*/
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static void device_late_fini(struct hl_device *hdev)
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{
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if (!hdev->late_init_done)
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return;
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cancel_delayed_work_sync(&hdev->work_freq);
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if (hdev->heartbeat)
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cancel_delayed_work_sync(&hdev->work_heartbeat);
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if (hdev->asic_funcs->late_fini)
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hdev->asic_funcs->late_fini(hdev);
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hdev->late_init_done = false;
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}
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/*
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* hl_device_set_frequency - set the frequency of the device
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*
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* @hdev: pointer to habanalabs device structure
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* @freq: the new frequency value
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*
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* Change the frequency if needed.
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* We allose to set PLL to low only if there is no user process
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* Returns 0 if no change was done, otherwise returns 1;
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*/
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int hl_device_set_frequency(struct hl_device *hdev, enum hl_pll_frequency freq)
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{
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enum hl_pll_frequency old_freq =
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(freq == PLL_HIGH) ? PLL_LOW : PLL_HIGH;
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int ret;
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if (hdev->pm_mng_profile == PM_MANUAL)
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return 0;
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ret = atomic_cmpxchg(&hdev->curr_pll_profile, old_freq, freq);
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if (ret == freq)
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return 0;
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/*
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* in case we want to lower frequency, check if device is not
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* opened. We must have a check here to workaround race condition with
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* hl_device_open
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*/
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if ((freq == PLL_LOW) && (atomic_read(&hdev->fd_open_cnt) > 0)) {
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atomic_set(&hdev->curr_pll_profile, PLL_HIGH);
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return 0;
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}
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dev_dbg(hdev->dev, "Changing device frequency to %s\n",
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freq == PLL_HIGH ? "high" : "low");
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hdev->asic_funcs->set_pll_profile(hdev, freq);
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return 1;
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}
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/*
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* hl_device_suspend - initiate device suspend
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*
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* @hdev: pointer to habanalabs device structure
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*
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* Puts the hw in the suspend state (all asics).
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* Returns 0 for success or an error on failure.
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* Called at driver suspend.
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*/
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int hl_device_suspend(struct hl_device *hdev)
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{
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int rc;
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pci_save_state(hdev->pdev);
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/* Block future CS/VM/JOB completion operations */
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rc = atomic_cmpxchg(&hdev->in_reset, 0, 1);
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if (rc) {
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dev_err(hdev->dev, "Can't suspend while in reset\n");
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return -EIO;
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}
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/* This blocks all other stuff that is not blocked by in_reset */
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hdev->disabled = true;
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/*
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* Flush anyone that is inside the critical section of enqueue
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* jobs to the H/W
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*/
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hdev->asic_funcs->hw_queues_lock(hdev);
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hdev->asic_funcs->hw_queues_unlock(hdev);
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/* Flush processes that are sending message to CPU */
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mutex_lock(&hdev->send_cpu_message_lock);
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mutex_unlock(&hdev->send_cpu_message_lock);
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rc = hdev->asic_funcs->suspend(hdev);
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if (rc)
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dev_err(hdev->dev,
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"Failed to disable PCI access of device CPU\n");
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/* Shut down the device */
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pci_disable_device(hdev->pdev);
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pci_set_power_state(hdev->pdev, PCI_D3hot);
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return 0;
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}
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/*
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* hl_device_resume - initiate device resume
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*
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* @hdev: pointer to habanalabs device structure
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*
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* Bring the hw back to operating state (all asics).
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* Returns 0 for success or an error on failure.
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* Called at driver resume.
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*/
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int hl_device_resume(struct hl_device *hdev)
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{
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int rc;
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pci_set_power_state(hdev->pdev, PCI_D0);
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pci_restore_state(hdev->pdev);
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rc = pci_enable_device_mem(hdev->pdev);
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if (rc) {
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dev_err(hdev->dev,
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"Failed to enable PCI device in resume\n");
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return rc;
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}
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pci_set_master(hdev->pdev);
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rc = hdev->asic_funcs->resume(hdev);
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if (rc) {
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dev_err(hdev->dev, "Failed to resume device after suspend\n");
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goto disable_device;
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}
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hdev->disabled = false;
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atomic_set(&hdev->in_reset, 0);
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rc = hl_device_reset(hdev, true, false);
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if (rc) {
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dev_err(hdev->dev, "Failed to reset device during resume\n");
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goto disable_device;
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}
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return 0;
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disable_device:
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pci_clear_master(hdev->pdev);
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pci_disable_device(hdev->pdev);
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return rc;
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}
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|
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static void hl_device_hard_reset_pending(struct work_struct *work)
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{
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struct hl_device_reset_work *device_reset_work =
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container_of(work, struct hl_device_reset_work, reset_work);
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struct hl_device *hdev = device_reset_work->hdev;
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u16 pending_total, pending_cnt;
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struct task_struct *task = NULL;
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if (hdev->pldm)
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pending_total = HL_PLDM_PENDING_RESET_PER_SEC;
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else
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pending_total = HL_PENDING_RESET_PER_SEC;
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|
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pending_cnt = pending_total;
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|
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/* Flush all processes that are inside hl_open */
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mutex_lock(&hdev->fd_open_cnt_lock);
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|
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while ((atomic_read(&hdev->fd_open_cnt)) && (pending_cnt)) {
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|
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pending_cnt--;
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|
|
|
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);
|
|
}
|
|
}
|
|
|
|
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);
|
|
|
|
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;
|
|
|
|
if (!hdev->pdev) {
|
|
dev_err(hdev->dev,
|
|
"Reset action is NOT supported in simulator\n");
|
|
rc = -EINVAL;
|
|
goto out_err;
|
|
}
|
|
|
|
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,
|
|
hl_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 setup phase for the user context will run again */
|
|
if (hdev->user_ctx) {
|
|
atomic_set(&hdev->user_ctx->thread_restore_token, 1);
|
|
hdev->user_ctx->thread_restore_wait_token = 0;
|
|
}
|
|
|
|
/* Finished tear-down, starting to re-initialize */
|
|
|
|
if (hard_reset) {
|
|
hdev->device_cpu_disabled = 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);
|
|
|
|
hdev->hard_reset_pending = false;
|
|
} 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;
|
|
|
|
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 = 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);
|
|
}
|