2 * Intel MIC Platform Software Stack (MPSS)
4 * Copyright(c) 2013 Intel Corporation.
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License, version 2, as
8 * published by the Free Software Foundation.
10 * This program is distributed in the hope that it will be useful, but
11 * WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * General Public License for more details.
15 * The full GNU General Public License is included in this distribution in
16 * the file called "COPYING".
18 * Intel MIC Host driver.
20 * Global TODO's across the driver to be added after initial base
21 * patches are accepted upstream:
22 * 1) Enable DMA support.
23 * 2) Enable per vring interrupt support.
26 #include <linux/module.h>
27 #include <linux/pci.h>
28 #include <linux/poll.h>
29 #include <linux/suspend.h>
31 #include <linux/mic_common.h>
32 #include "../common/mic_dev.h"
33 #include "mic_device.h"
37 #include "mic_virtio.h"
39 static const char mic_driver_name[] = "mic";
41 static DEFINE_PCI_DEVICE_TABLE(mic_pci_tbl) = {
42 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2250)},
43 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2251)},
44 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2252)},
45 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2253)},
46 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2254)},
47 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2255)},
48 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2256)},
49 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2257)},
50 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2258)},
51 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2259)},
52 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_225a)},
53 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_225b)},
54 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_225c)},
55 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_225d)},
56 {PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_225e)},
58 /* required last entry */
62 MODULE_DEVICE_TABLE(pci, mic_pci_tbl);
64 /* ID allocator for MIC devices */
65 static struct ida g_mic_ida;
66 /* Class of MIC devices for sysfs accessibility. */
67 static struct class *g_mic_class;
68 /* Base device node number for MIC devices */
69 static dev_t g_mic_devno;
71 static const struct file_operations mic_fops = {
73 .release = mic_release,
74 .unlocked_ioctl = mic_ioctl,
80 /* Initialize the device page */
81 static int mic_dp_init(struct mic_device *mdev)
83 mdev->dp = kzalloc(MIC_DP_SIZE, GFP_KERNEL);
85 dev_err(mdev->sdev->parent, "%s %d err %d\n",
86 __func__, __LINE__, -ENOMEM);
90 mdev->dp_dma_addr = mic_map_single(mdev,
91 mdev->dp, MIC_DP_SIZE);
92 if (mic_map_error(mdev->dp_dma_addr)) {
94 dev_err(mdev->sdev->parent, "%s %d err %d\n",
95 __func__, __LINE__, -ENOMEM);
98 mdev->ops->write_spad(mdev, MIC_DPLO_SPAD, mdev->dp_dma_addr);
99 mdev->ops->write_spad(mdev, MIC_DPHI_SPAD, mdev->dp_dma_addr >> 32);
103 /* Uninitialize the device page */
104 static void mic_dp_uninit(struct mic_device *mdev)
106 mic_unmap_single(mdev, mdev->dp_dma_addr, MIC_DP_SIZE);
111 * mic_shutdown_db - Shutdown doorbell interrupt handler.
113 static irqreturn_t mic_shutdown_db(int irq, void *data)
115 struct mic_device *mdev = data;
116 struct mic_bootparam *bootparam = mdev->dp;
118 mdev->ops->ack_interrupt(mdev);
120 switch (bootparam->shutdown_status) {
126 schedule_work(&mdev->shutdown_work);
135 * mic_ops_init: Initialize HW specific operation tables.
137 * @mdev: pointer to mic_device instance
141 static void mic_ops_init(struct mic_device *mdev)
143 switch (mdev->family) {
144 case MIC_FAMILY_X100:
145 mdev->ops = &mic_x100_ops;
146 mdev->intr_ops = &mic_x100_intr_ops;
147 mdev->smpt_ops = &mic_x100_smpt_ops;
155 * mic_get_family - Determine hardware family to which this MIC belongs.
157 * @pdev: The pci device structure
161 static enum mic_hw_family mic_get_family(struct pci_dev *pdev)
163 enum mic_hw_family family;
165 switch (pdev->device) {
166 case MIC_X100_PCI_DEVICE_2250:
167 case MIC_X100_PCI_DEVICE_2251:
168 case MIC_X100_PCI_DEVICE_2252:
169 case MIC_X100_PCI_DEVICE_2253:
170 case MIC_X100_PCI_DEVICE_2254:
171 case MIC_X100_PCI_DEVICE_2255:
172 case MIC_X100_PCI_DEVICE_2256:
173 case MIC_X100_PCI_DEVICE_2257:
174 case MIC_X100_PCI_DEVICE_2258:
175 case MIC_X100_PCI_DEVICE_2259:
176 case MIC_X100_PCI_DEVICE_225a:
177 case MIC_X100_PCI_DEVICE_225b:
178 case MIC_X100_PCI_DEVICE_225c:
179 case MIC_X100_PCI_DEVICE_225d:
180 case MIC_X100_PCI_DEVICE_225e:
181 family = MIC_FAMILY_X100;
184 family = MIC_FAMILY_UNKNOWN;
191 * mic_pm_notifier: Notifier callback function that handles
194 * @notifier_block: The notifier structure.
195 * @pm_event: The event for which the driver was notified.
196 * @unused: Meaningless. Always NULL.
198 * returns NOTIFY_DONE
200 static int mic_pm_notifier(struct notifier_block *notifier,
201 unsigned long pm_event, void *unused)
203 struct mic_device *mdev = container_of(notifier,
204 struct mic_device, pm_notifier);
207 case PM_HIBERNATION_PREPARE:
209 case PM_SUSPEND_PREPARE:
210 mic_prepare_suspend(mdev);
212 case PM_POST_HIBERNATION:
214 case PM_POST_SUSPEND:
216 case PM_POST_RESTORE:
217 mic_complete_resume(mdev);
219 case PM_RESTORE_PREPARE:
228 * mic_device_init - Allocates and initializes the MIC device structure
230 * @mdev: pointer to mic_device instance
231 * @pdev: The pci device structure
236 mic_device_init(struct mic_device *mdev, struct pci_dev *pdev)
240 mdev->family = mic_get_family(pdev);
241 mdev->stepping = pdev->revision;
243 mic_sysfs_init(mdev);
244 mutex_init(&mdev->mic_mutex);
245 mdev->irq_info.next_avail_src = 0;
246 INIT_WORK(&mdev->reset_trigger_work, mic_reset_trigger_work);
247 INIT_WORK(&mdev->shutdown_work, mic_shutdown_work);
248 init_completion(&mdev->reset_wait);
249 INIT_LIST_HEAD(&mdev->vdev_list);
250 mdev->pm_notifier.notifier_call = mic_pm_notifier;
251 rc = register_pm_notifier(&mdev->pm_notifier);
253 dev_err(&pdev->dev, "register_pm_notifier failed rc %d\n",
255 goto register_pm_notifier_fail;
258 register_pm_notifier_fail:
259 flush_work(&mdev->shutdown_work);
260 flush_work(&mdev->reset_trigger_work);
265 * mic_device_uninit - Frees resources allocated during mic_device_init(..)
267 * @mdev: pointer to mic_device instance
271 static void mic_device_uninit(struct mic_device *mdev)
273 /* The cmdline sysfs entry might have allocated cmdline */
274 kfree(mdev->cmdline);
275 kfree(mdev->firmware);
276 kfree(mdev->ramdisk);
277 kfree(mdev->bootmode);
278 flush_work(&mdev->reset_trigger_work);
279 flush_work(&mdev->shutdown_work);
280 unregister_pm_notifier(&mdev->pm_notifier);
284 * mic_probe - Device Initialization Routine
286 * @pdev: PCI device structure
287 * @ent: entry in mic_pci_tbl
289 * returns 0 on success, < 0 on failure.
291 static int mic_probe(struct pci_dev *pdev,
292 const struct pci_device_id *ent)
295 struct mic_device *mdev;
297 mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
300 dev_err(&pdev->dev, "mdev kmalloc failed rc %d\n", rc);
301 goto mdev_alloc_fail;
303 mdev->id = ida_simple_get(&g_mic_ida, 0, MIC_MAX_NUM_DEVS, GFP_KERNEL);
306 dev_err(&pdev->dev, "ida_simple_get failed rc %d\n", rc);
310 rc = mic_device_init(mdev, pdev);
312 dev_err(&pdev->dev, "mic_device_init failed rc %d\n", rc);
313 goto device_init_fail;
316 rc = pci_enable_device(pdev);
318 dev_err(&pdev->dev, "failed to enable pci device.\n");
322 pci_set_master(pdev);
324 rc = pci_request_regions(pdev, mic_driver_name);
326 dev_err(&pdev->dev, "failed to get pci regions.\n");
330 rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
332 dev_err(&pdev->dev, "Cannot set DMA mask\n");
333 goto release_regions;
336 mdev->mmio.pa = pci_resource_start(pdev, mdev->ops->mmio_bar);
337 mdev->mmio.len = pci_resource_len(pdev, mdev->ops->mmio_bar);
338 mdev->mmio.va = pci_ioremap_bar(pdev, mdev->ops->mmio_bar);
339 if (!mdev->mmio.va) {
340 dev_err(&pdev->dev, "Cannot remap MMIO BAR\n");
342 goto release_regions;
345 mdev->aper.pa = pci_resource_start(pdev, mdev->ops->aper_bar);
346 mdev->aper.len = pci_resource_len(pdev, mdev->ops->aper_bar);
347 mdev->aper.va = ioremap_wc(mdev->aper.pa, mdev->aper.len);
348 if (!mdev->aper.va) {
349 dev_err(&pdev->dev, "Cannot remap Aperture BAR\n");
354 mdev->intr_ops->intr_init(mdev);
355 rc = mic_setup_interrupts(mdev, pdev);
357 dev_err(&pdev->dev, "mic_setup_interrupts failed %d\n", rc);
360 rc = mic_smpt_init(mdev);
362 dev_err(&pdev->dev, "smpt_init failed %d\n", rc);
363 goto free_interrupts;
366 pci_set_drvdata(pdev, mdev);
368 mdev->sdev = device_create_with_groups(g_mic_class, &pdev->dev,
369 MKDEV(MAJOR(g_mic_devno), mdev->id), NULL,
370 mdev->attr_group, "mic%d", mdev->id);
371 if (IS_ERR(mdev->sdev)) {
372 rc = PTR_ERR(mdev->sdev);
374 "device_create_with_groups failed rc %d\n", rc);
377 mdev->state_sysfs = sysfs_get_dirent(mdev->sdev->kobj.sd, "state");
378 if (!mdev->state_sysfs) {
380 dev_err(&pdev->dev, "sysfs_get_dirent failed rc %d\n", rc);
384 rc = mic_dp_init(mdev);
386 dev_err(&pdev->dev, "mic_dp_init failed rc %d\n", rc);
389 mutex_lock(&mdev->mic_mutex);
391 mdev->shutdown_db = mic_next_db(mdev);
392 mdev->shutdown_cookie = mic_request_irq(mdev, mic_shutdown_db,
393 "shutdown-interrupt", mdev, mdev->shutdown_db, MIC_INTR_DB);
394 if (IS_ERR(mdev->shutdown_cookie)) {
395 rc = PTR_ERR(mdev->shutdown_cookie);
396 mutex_unlock(&mdev->mic_mutex);
399 mutex_unlock(&mdev->mic_mutex);
400 mic_bootparam_init(mdev);
402 mic_create_debug_dir(mdev);
403 cdev_init(&mdev->cdev, &mic_fops);
404 mdev->cdev.owner = THIS_MODULE;
405 rc = cdev_add(&mdev->cdev, MKDEV(MAJOR(g_mic_devno), mdev->id), 1);
407 dev_err(&pdev->dev, "cdev_add err id %d rc %d\n", mdev->id, rc);
408 goto cleanup_debug_dir;
412 mic_delete_debug_dir(mdev);
413 mutex_lock(&mdev->mic_mutex);
414 mic_free_irq(mdev, mdev->shutdown_cookie, mdev);
415 mutex_unlock(&mdev->mic_mutex);
419 sysfs_put(mdev->state_sysfs);
421 device_destroy(g_mic_class, MKDEV(MAJOR(g_mic_devno), mdev->id));
423 mic_smpt_uninit(mdev);
425 mic_free_interrupts(mdev, pdev);
427 iounmap(mdev->aper.va);
429 iounmap(mdev->mmio.va);
431 pci_release_regions(pdev);
433 pci_disable_device(pdev);
435 mic_device_uninit(mdev);
437 ida_simple_remove(&g_mic_ida, mdev->id);
441 dev_err(&pdev->dev, "Probe failed rc %d\n", rc);
446 * mic_remove - Device Removal Routine
447 * mic_remove is called by the PCI subsystem to alert the driver
448 * that it should release a PCI device.
450 * @pdev: PCI device structure
452 static void mic_remove(struct pci_dev *pdev)
454 struct mic_device *mdev;
456 mdev = pci_get_drvdata(pdev);
460 mic_stop(mdev, false);
461 cdev_del(&mdev->cdev);
462 mic_delete_debug_dir(mdev);
463 mutex_lock(&mdev->mic_mutex);
464 mic_free_irq(mdev, mdev->shutdown_cookie, mdev);
465 mutex_unlock(&mdev->mic_mutex);
466 flush_work(&mdev->shutdown_work);
468 sysfs_put(mdev->state_sysfs);
469 device_destroy(g_mic_class, MKDEV(MAJOR(g_mic_devno), mdev->id));
470 mic_smpt_uninit(mdev);
471 mic_free_interrupts(mdev, pdev);
472 iounmap(mdev->mmio.va);
473 iounmap(mdev->aper.va);
474 mic_device_uninit(mdev);
475 pci_release_regions(pdev);
476 pci_disable_device(pdev);
477 ida_simple_remove(&g_mic_ida, mdev->id);
480 static struct pci_driver mic_driver = {
481 .name = mic_driver_name,
482 .id_table = mic_pci_tbl,
487 static int __init mic_init(void)
491 ret = alloc_chrdev_region(&g_mic_devno, 0,
492 MIC_MAX_NUM_DEVS, mic_driver_name);
494 pr_err("alloc_chrdev_region failed ret %d\n", ret);
498 g_mic_class = class_create(THIS_MODULE, mic_driver_name);
499 if (IS_ERR(g_mic_class)) {
500 ret = PTR_ERR(g_mic_class);
501 pr_err("class_create failed ret %d\n", ret);
506 ida_init(&g_mic_ida);
507 ret = pci_register_driver(&mic_driver);
509 pr_err("pci_register_driver failed ret %d\n", ret);
510 goto cleanup_debugfs;
515 class_destroy(g_mic_class);
517 unregister_chrdev_region(g_mic_devno, MIC_MAX_NUM_DEVS);
522 static void __exit mic_exit(void)
524 pci_unregister_driver(&mic_driver);
525 ida_destroy(&g_mic_ida);
527 class_destroy(g_mic_class);
528 unregister_chrdev_region(g_mic_devno, MIC_MAX_NUM_DEVS);
531 module_init(mic_init);
532 module_exit(mic_exit);
534 MODULE_AUTHOR("Intel Corporation");
535 MODULE_DESCRIPTION("Intel(R) MIC X100 Host driver");
536 MODULE_LICENSE("GPL v2");