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path: root/drivers/misc/habanalabs/habanalabs_drv.c
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Diffstat (limited to 'drivers/misc/habanalabs/habanalabs_drv.c')
-rw-r--r--drivers/misc/habanalabs/habanalabs_drv.c461
1 files changed, 461 insertions, 0 deletions
diff --git a/drivers/misc/habanalabs/habanalabs_drv.c b/drivers/misc/habanalabs/habanalabs_drv.c
new file mode 100644
index 000000000000..748601463f11
--- /dev/null
+++ b/drivers/misc/habanalabs/habanalabs_drv.c
@@ -0,0 +1,461 @@
+// SPDX-License-Identifier: GPL-2.0
+
+/*
+ * Copyright 2016-2019 HabanaLabs, Ltd.
+ * All Rights Reserved.
+ *
+ */
+
+#include "habanalabs.h"
+
+#include <linux/pci.h>
+#include <linux/module.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 struct class *hl_class;
+static DEFINE_IDR(hl_devs_idr);
+static DEFINE_MUTEX(hl_devs_idr_lock);
+
+static int timeout_locked = 5;
+static int reset_on_lockup = 1;
+
+module_param(timeout_locked, int, 0444);
+MODULE_PARM_DESC(timeout_locked,
+ "Device lockup timeout in seconds (0 = disabled, default 5s)");
+
+module_param(reset_on_lockup, int, 0444);
+MODULE_PARM_DESC(reset_on_lockup,
+ "Do device reset on lockup (0 = no, 1 = yes, default yes)");
+
+#define PCI_VENDOR_ID_HABANALABS 0x1da3
+
+#define PCI_IDS_GOYA 0x0001
+
+static const struct pci_device_id ids[] = {
+ { PCI_DEVICE(PCI_VENDOR_ID_HABANALABS, PCI_IDS_GOYA), },
+ { 0, }
+};
+MODULE_DEVICE_TABLE(pci, ids);
+
+/*
+ * get_asic_type - translate device id to asic type
+ *
+ * @device: id of the PCI device
+ *
+ * Translate device id to asic type.
+ * In case of unidentified device, return -1
+ */
+static enum hl_asic_type get_asic_type(u16 device)
+{
+ enum hl_asic_type asic_type;
+
+ switch (device) {
+ case PCI_IDS_GOYA:
+ asic_type = ASIC_GOYA;
+ break;
+ default:
+ asic_type = ASIC_INVALID;
+ break;
+ }
+
+ return asic_type;
+}
+
+/*
+ * hl_device_open - open function for habanalabs device
+ *
+ * @inode: pointer to inode structure
+ * @filp: pointer to file structure
+ *
+ * Called when process opens an habanalabs device.
+ */
+int hl_device_open(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;
+ }
+
+ mutex_lock(&hdev->fd_open_cnt_lock);
+
+ if (hl_device_disabled_or_in_reset(hdev)) {
+ dev_err_ratelimited(hdev->dev,
+ "Can't open %s because it is disabled or in reset\n",
+ dev_name(hdev->dev));
+ mutex_unlock(&hdev->fd_open_cnt_lock);
+ return -EPERM;
+ }
+
+ if (atomic_read(&hdev->fd_open_cnt)) {
+ dev_info_ratelimited(hdev->dev,
+ "Device %s is already attached to application\n",
+ dev_name(hdev->dev));
+ mutex_unlock(&hdev->fd_open_cnt_lock);
+ return -EBUSY;
+ }
+
+ atomic_inc(&hdev->fd_open_cnt);
+
+ mutex_unlock(&hdev->fd_open_cnt_lock);
+
+ hpriv = kzalloc(sizeof(*hpriv), GFP_KERNEL);
+ if (!hpriv) {
+ rc = -ENOMEM;
+ goto close_device;
+ }
+
+ hpriv->hdev = hdev;
+ filp->private_data = hpriv;
+ hpriv->filp = filp;
+ mutex_init(&hpriv->restore_phase_mutex);
+ kref_init(&hpriv->refcount);
+ nonseekable_open(inode, filp);
+
+ hl_cb_mgr_init(&hpriv->cb_mgr);
+ hl_ctx_mgr_init(&hpriv->ctx_mgr);
+
+ rc = hl_ctx_create(hdev, hpriv);
+ if (rc) {
+ dev_err(hdev->dev, "Failed to open FD (CTX fail)\n");
+ goto out_err;
+ }
+
+ hpriv->taskpid = find_get_pid(current->pid);
+
+ /*
+ * Device is IDLE at this point so it is legal to change PLLs. There
+ * is no need to check anything because if the PLL is already HIGH, the
+ * set function will return without doing anything
+ */
+ hl_device_set_frequency(hdev, PLL_HIGH);
+
+ hl_debugfs_add_file(hpriv);
+
+ return 0;
+
+out_err:
+ filp->private_data = NULL;
+ hl_ctx_mgr_fini(hpriv->hdev, &hpriv->ctx_mgr);
+ hl_cb_mgr_fini(hpriv->hdev, &hpriv->cb_mgr);
+ mutex_destroy(&hpriv->restore_phase_mutex);
+ kfree(hpriv);
+
+close_device:
+ atomic_dec(&hdev->fd_open_cnt);
+ return rc;
+}
+
+/*
+ * create_hdev - create habanalabs device instance
+ *
+ * @dev: will hold the pointer to the new habanalabs device structure
+ * @pdev: pointer to the pci device
+ * @asic_type: in case of simulator device, which device is it
+ * @minor: in case of simulator device, the minor of the device
+ *
+ * Allocate memory for habanalabs device and initialize basic fields
+ * Identify the ASIC type
+ * Allocate ID (minor) for the device (only for real devices)
+ */
+int create_hdev(struct hl_device **dev, struct pci_dev *pdev,
+ enum hl_asic_type asic_type, int minor)
+{
+ struct hl_device *hdev;
+ int rc;
+
+ *dev = NULL;
+
+ hdev = kzalloc(sizeof(*hdev), GFP_KERNEL);
+ if (!hdev)
+ return -ENOMEM;
+
+ hdev->major = hl_major;
+ hdev->reset_on_lockup = reset_on_lockup;
+
+ /* Parameters for bring-up - set them to defaults */
+ hdev->mmu_enable = 1;
+ hdev->cpu_enable = 1;
+ hdev->reset_pcilink = 0;
+ hdev->cpu_queues_enable = 1;
+ hdev->fw_loading = 1;
+ hdev->pldm = 0;
+ hdev->heartbeat = 1;
+
+ /* If CPU is disabled, no point in loading FW */
+ if (!hdev->cpu_enable)
+ hdev->fw_loading = 0;
+
+ /* If we don't load FW, no need to initialize CPU queues */
+ if (!hdev->fw_loading)
+ hdev->cpu_queues_enable = 0;
+
+ /* If CPU queues not enabled, no way to do heartbeat */
+ if (!hdev->cpu_queues_enable)
+ hdev->heartbeat = 0;
+
+ if (timeout_locked)
+ hdev->timeout_jiffies = msecs_to_jiffies(timeout_locked * 1000);
+ else
+ hdev->timeout_jiffies = MAX_SCHEDULE_TIMEOUT;
+
+ hdev->disabled = true;
+ hdev->pdev = pdev; /* can be NULL in case of simulator device */
+
+ if (asic_type == ASIC_AUTO_DETECT) {
+ hdev->asic_type = get_asic_type(pdev->device);
+ if (hdev->asic_type == ASIC_INVALID) {
+ dev_err(&pdev->dev, "Unsupported ASIC\n");
+ rc = -ENODEV;
+ goto free_hdev;
+ }
+ } else {
+ hdev->asic_type = asic_type;
+ }
+
+ mutex_lock(&hl_devs_idr_lock);
+
+ if (minor == -1) {
+ rc = idr_alloc(&hl_devs_idr, hdev, 0, HL_MAX_MINORS,
+ GFP_KERNEL);
+ } else {
+ void *old_idr = idr_replace(&hl_devs_idr, hdev, minor);
+
+ if (IS_ERR_VALUE(old_idr)) {
+ rc = PTR_ERR(old_idr);
+ pr_err("Error %d when trying to replace minor %d\n",
+ rc, minor);
+ mutex_unlock(&hl_devs_idr_lock);
+ goto free_hdev;
+ }
+ rc = minor;
+ }
+
+ mutex_unlock(&hl_devs_idr_lock);
+
+ if (rc < 0) {
+ if (rc == -ENOSPC) {
+ pr_err("too many devices in the system\n");
+ rc = -EBUSY;
+ }
+ goto free_hdev;
+ }
+
+ hdev->id = rc;
+
+ *dev = hdev;
+
+ return 0;
+
+free_hdev:
+ kfree(hdev);
+ return rc;
+}
+
+/*
+ * destroy_hdev - destroy habanalabs device instance
+ *
+ * @dev: pointer to the habanalabs device structure
+ *
+ */
+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);
+
+ kfree(hdev);
+}
+
+static int hl_pmops_suspend(struct device *dev)
+{
+ struct pci_dev *pdev = to_pci_dev(dev);
+ struct hl_device *hdev = pci_get_drvdata(pdev);
+
+ 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 pci_dev *pdev = to_pci_dev(dev);
+ struct hl_device *hdev = pci_get_drvdata(pdev);
+
+ 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, ASIC_AUTO_DETECT, -1);
+ if (rc)
+ return rc;
+
+ pci_set_drvdata(pdev, hdev);
+
+ rc = hl_device_init(hdev, hl_class);
+ 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);
+}
+
+static const struct dev_pm_ops hl_pm_ops = {
+ .suspend = hl_pmops_suspend,
+ .resume = hl_pmops_resume,
+};
+
+static struct pci_driver hl_pci_driver = {
+ .name = HL_NAME,
+ .id_table = ids,
+ .probe = hl_pci_probe,
+ .remove = hl_pci_remove,
+ .driver.pm = &hl_pm_ops,
+};
+
+/*
+ * 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);
+
+ hl_class = class_create(THIS_MODULE, HL_NAME);
+ if (IS_ERR(hl_class)) {
+ pr_err("failed to allocate class\n");
+ rc = PTR_ERR(hl_class);
+ goto remove_major;
+ }
+
+ hl_debugfs_init();
+
+ rc = pci_register_driver(&hl_pci_driver);
+ if (rc) {
+ pr_err("failed to register pci device\n");
+ goto remove_debugfs;
+ }
+
+ pr_debug("driver loaded\n");
+
+ return 0;
+
+remove_debugfs:
+ hl_debugfs_fini();
+ class_destroy(hl_class);
+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);
+
+ /*
+ * Removing debugfs must be after all devices or simulator devices
+ * have been removed because otherwise we get a bug in the
+ * debugfs module for referencing NULL objects
+ */
+ hl_debugfs_fini();
+
+ class_destroy(hl_class);
+ 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);