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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2003-2022, Intel Corporation. All rights reserved.
4 * Intel Management Engine Interface (Intel MEI) Linux driver
5 */
6
7#include <linux/module.h>
8#include <linux/kernel.h>
9#include <linux/device.h>
10#include <linux/errno.h>
11#include <linux/types.h>
12#include <linux/pci.h>
13#include <linux/dma-mapping.h>
14#include <linux/sched.h>
15#include <linux/interrupt.h>
16
17#include <linux/pm_domain.h>
18#include <linux/pm_runtime.h>
19
20#include <linux/mei.h>
21
22#include "mei_dev.h"
23#include "client.h"
24#include "hw-me-regs.h"
25#include "hw-me.h"
26
27/* mei_pci_tbl - PCI Device ID Table */
28static const struct pci_device_id mei_me_pci_tbl[] = {
29 {MEI_PCI_DEVICE(MEI_DEV_ID_82946GZ, MEI_ME_ICH_CFG)},
30 {MEI_PCI_DEVICE(MEI_DEV_ID_82G35, MEI_ME_ICH_CFG)},
31 {MEI_PCI_DEVICE(MEI_DEV_ID_82Q965, MEI_ME_ICH_CFG)},
32 {MEI_PCI_DEVICE(MEI_DEV_ID_82G965, MEI_ME_ICH_CFG)},
33 {MEI_PCI_DEVICE(MEI_DEV_ID_82GM965, MEI_ME_ICH_CFG)},
34 {MEI_PCI_DEVICE(MEI_DEV_ID_82GME965, MEI_ME_ICH_CFG)},
35 {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82Q35, MEI_ME_ICH_CFG)},
36 {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82G33, MEI_ME_ICH_CFG)},
37 {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82Q33, MEI_ME_ICH_CFG)},
38 {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82X38, MEI_ME_ICH_CFG)},
39 {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_3200, MEI_ME_ICH_CFG)},
40
41 {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_6, MEI_ME_ICH_CFG)},
42 {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_7, MEI_ME_ICH_CFG)},
43 {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_8, MEI_ME_ICH_CFG)},
44 {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_9, MEI_ME_ICH_CFG)},
45 {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_10, MEI_ME_ICH_CFG)},
46 {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_1, MEI_ME_ICH_CFG)},
47 {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_2, MEI_ME_ICH_CFG)},
48 {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_3, MEI_ME_ICH_CFG)},
49 {MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_4, MEI_ME_ICH_CFG)},
50
51 {MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_1, MEI_ME_ICH10_CFG)},
52 {MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_2, MEI_ME_ICH10_CFG)},
53 {MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_3, MEI_ME_ICH10_CFG)},
54 {MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_4, MEI_ME_ICH10_CFG)},
55
56 {MEI_PCI_DEVICE(MEI_DEV_ID_IBXPK_1, MEI_ME_PCH6_CFG)},
57 {MEI_PCI_DEVICE(MEI_DEV_ID_IBXPK_2, MEI_ME_PCH6_CFG)},
58 {MEI_PCI_DEVICE(MEI_DEV_ID_CPT_1, MEI_ME_PCH_CPT_PBG_CFG)},
59 {MEI_PCI_DEVICE(MEI_DEV_ID_PBG_1, MEI_ME_PCH_CPT_PBG_CFG)},
60 {MEI_PCI_DEVICE(MEI_DEV_ID_PPT_1, MEI_ME_PCH7_CFG)},
61 {MEI_PCI_DEVICE(MEI_DEV_ID_PPT_2, MEI_ME_PCH7_CFG)},
62 {MEI_PCI_DEVICE(MEI_DEV_ID_PPT_3, MEI_ME_PCH7_CFG)},
63 {MEI_PCI_DEVICE(MEI_DEV_ID_LPT_H, MEI_ME_PCH8_SPS_4_CFG)},
64 {MEI_PCI_DEVICE(MEI_DEV_ID_LPT_W, MEI_ME_PCH8_SPS_4_CFG)},
65 {MEI_PCI_DEVICE(MEI_DEV_ID_LPT_LP, MEI_ME_PCH8_CFG)},
66 {MEI_PCI_DEVICE(MEI_DEV_ID_LPT_HR, MEI_ME_PCH8_SPS_4_CFG)},
67 {MEI_PCI_DEVICE(MEI_DEV_ID_WPT_LP, MEI_ME_PCH8_CFG)},
68 {MEI_PCI_DEVICE(MEI_DEV_ID_WPT_LP_2, MEI_ME_PCH8_CFG)},
69
70 {MEI_PCI_DEVICE(MEI_DEV_ID_SPT, MEI_ME_PCH8_CFG)},
71 {MEI_PCI_DEVICE(MEI_DEV_ID_SPT_2, MEI_ME_PCH8_CFG)},
72 {MEI_PCI_DEVICE(MEI_DEV_ID_SPT_3, MEI_ME_PCH8_ITOUCH_CFG)},
73 {MEI_PCI_DEVICE(MEI_DEV_ID_SPT_H, MEI_ME_PCH8_SPS_4_CFG)},
74 {MEI_PCI_DEVICE(MEI_DEV_ID_SPT_H_2, MEI_ME_PCH8_SPS_4_CFG)},
75 {MEI_PCI_DEVICE(MEI_DEV_ID_LBG, MEI_ME_PCH12_SPS_4_CFG)},
76
77 {MEI_PCI_DEVICE(MEI_DEV_ID_BXT_M, MEI_ME_PCH8_CFG)},
78 {MEI_PCI_DEVICE(MEI_DEV_ID_APL_I, MEI_ME_PCH8_CFG)},
79
80 {MEI_PCI_DEVICE(MEI_DEV_ID_DNV_IE, MEI_ME_PCH8_CFG)},
81
82 {MEI_PCI_DEVICE(MEI_DEV_ID_GLK, MEI_ME_PCH8_CFG)},
83
84 {MEI_PCI_DEVICE(MEI_DEV_ID_KBP, MEI_ME_PCH8_CFG)},
85 {MEI_PCI_DEVICE(MEI_DEV_ID_KBP_2, MEI_ME_PCH8_CFG)},
86 {MEI_PCI_DEVICE(MEI_DEV_ID_KBP_3, MEI_ME_PCH8_CFG)},
87
88 {MEI_PCI_DEVICE(MEI_DEV_ID_CNP_LP, MEI_ME_PCH12_CFG)},
89 {MEI_PCI_DEVICE(MEI_DEV_ID_CNP_LP_3, MEI_ME_PCH8_ITOUCH_CFG)},
90 {MEI_PCI_DEVICE(MEI_DEV_ID_CNP_H, MEI_ME_PCH12_SPS_CFG)},
91 {MEI_PCI_DEVICE(MEI_DEV_ID_CNP_H_3, MEI_ME_PCH12_SPS_ITOUCH_CFG)},
92
93 {MEI_PCI_DEVICE(MEI_DEV_ID_CMP_LP, MEI_ME_PCH12_CFG)},
94 {MEI_PCI_DEVICE(MEI_DEV_ID_CMP_LP_3, MEI_ME_PCH8_ITOUCH_CFG)},
95 {MEI_PCI_DEVICE(MEI_DEV_ID_CMP_V, MEI_ME_PCH12_CFG)},
96 {MEI_PCI_DEVICE(MEI_DEV_ID_CMP_H, MEI_ME_PCH12_CFG)},
97 {MEI_PCI_DEVICE(MEI_DEV_ID_CMP_H_3, MEI_ME_PCH8_ITOUCH_CFG)},
98
99 {MEI_PCI_DEVICE(MEI_DEV_ID_ICP_LP, MEI_ME_PCH12_CFG)},
100 {MEI_PCI_DEVICE(MEI_DEV_ID_ICP_N, MEI_ME_PCH12_CFG)},
101
102 {MEI_PCI_DEVICE(MEI_DEV_ID_TGP_LP, MEI_ME_PCH15_CFG)},
103 {MEI_PCI_DEVICE(MEI_DEV_ID_TGP_H, MEI_ME_PCH15_SPS_CFG)},
104
105 {MEI_PCI_DEVICE(MEI_DEV_ID_JSP_N, MEI_ME_PCH15_CFG)},
106
107 {MEI_PCI_DEVICE(MEI_DEV_ID_MCC, MEI_ME_PCH15_CFG)},
108 {MEI_PCI_DEVICE(MEI_DEV_ID_MCC_4, MEI_ME_PCH8_CFG)},
109
110 {MEI_PCI_DEVICE(MEI_DEV_ID_CDF, MEI_ME_PCH8_CFG)},
111
112 {MEI_PCI_DEVICE(MEI_DEV_ID_EBG, MEI_ME_PCH15_SPS_CFG)},
113
114 {MEI_PCI_DEVICE(MEI_DEV_ID_ADP_S, MEI_ME_PCH15_CFG)},
115 {MEI_PCI_DEVICE(MEI_DEV_ID_ADP_LP, MEI_ME_PCH15_CFG)},
116 {MEI_PCI_DEVICE(MEI_DEV_ID_ADP_P, MEI_ME_PCH15_CFG)},
117 {MEI_PCI_DEVICE(MEI_DEV_ID_ADP_N, MEI_ME_PCH15_CFG)},
118
119 {MEI_PCI_DEVICE(MEI_DEV_ID_RPL_S, MEI_ME_PCH15_CFG)},
120
121 {MEI_PCI_DEVICE(MEI_DEV_ID_MTL_M, MEI_ME_PCH15_CFG)},
122
123 /* required last entry */
124 {0, }
125};
126
127MODULE_DEVICE_TABLE(pci, mei_me_pci_tbl);
128
129#ifdef CONFIG_PM
130static inline void mei_me_set_pm_domain(struct mei_device *dev);
131static inline void mei_me_unset_pm_domain(struct mei_device *dev);
132#else
133static inline void mei_me_set_pm_domain(struct mei_device *dev) {}
134static inline void mei_me_unset_pm_domain(struct mei_device *dev) {}
135#endif /* CONFIG_PM */
136
137static int mei_me_read_fws(const struct mei_device *dev, int where, u32 *val)
138{
139 struct pci_dev *pdev = to_pci_dev(dev->dev);
140
141 return pci_read_config_dword(pdev, where, val);
142}
143
144/**
145 * mei_me_quirk_probe - probe for devices that doesn't valid ME interface
146 *
147 * @pdev: PCI device structure
148 * @cfg: per generation config
149 *
150 * Return: true if ME Interface is valid, false otherwise
151 */
152static bool mei_me_quirk_probe(struct pci_dev *pdev,
153 const struct mei_cfg *cfg)
154{
155 if (cfg->quirk_probe && cfg->quirk_probe(pdev)) {
156 dev_info(&pdev->dev, "Device doesn't have valid ME Interface\n");
157 return false;
158 }
159
160 return true;
161}
162
163/**
164 * mei_me_probe - Device Initialization Routine
165 *
166 * @pdev: PCI device structure
167 * @ent: entry in kcs_pci_tbl
168 *
169 * Return: 0 on success, <0 on failure.
170 */
171static int mei_me_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
172{
173 const struct mei_cfg *cfg;
174 struct mei_device *dev;
175 struct mei_me_hw *hw;
176 unsigned int irqflags;
177 int err;
178
179 cfg = mei_me_get_cfg(ent->driver_data);
180 if (!cfg)
181 return -ENODEV;
182
183 if (!mei_me_quirk_probe(pdev, cfg))
184 return -ENODEV;
185
186 /* enable pci dev */
187 err = pcim_enable_device(pdev);
188 if (err) {
189 dev_err(&pdev->dev, "failed to enable pci device.\n");
190 goto end;
191 }
192 /* set PCI host mastering */
193 pci_set_master(pdev);
194 /* pci request regions and mapping IO device memory for mei driver */
195 err = pcim_iomap_regions(pdev, BIT(0), KBUILD_MODNAME);
196 if (err) {
197 dev_err(&pdev->dev, "failed to get pci regions.\n");
198 goto end;
199 }
200
201 err = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(64));
202 if (err) {
203 dev_err(&pdev->dev, "No usable DMA configuration, aborting\n");
204 goto end;
205 }
206
207 /* allocates and initializes the mei dev structure */
208 dev = mei_me_dev_init(&pdev->dev, cfg, false);
209 if (!dev) {
210 err = -ENOMEM;
211 goto end;
212 }
213 hw = to_me_hw(dev);
214 hw->mem_addr = pcim_iomap_table(pdev)[0];
215 hw->read_fws = mei_me_read_fws;
216
217 pci_enable_msi(pdev);
218
219 hw->irq = pdev->irq;
220
221 /* request and enable interrupt */
222 irqflags = pci_dev_msi_enabled(pdev) ? IRQF_ONESHOT : IRQF_SHARED;
223
224 err = request_threaded_irq(pdev->irq,
225 mei_me_irq_quick_handler,
226 mei_me_irq_thread_handler,
227 irqflags, KBUILD_MODNAME, dev);
228 if (err) {
229 dev_err(&pdev->dev, "request_threaded_irq failure. irq = %d\n",
230 pdev->irq);
231 goto end;
232 }
233
234 if (mei_start(dev)) {
235 dev_err(&pdev->dev, "init hw failure.\n");
236 err = -ENODEV;
237 goto release_irq;
238 }
239
240 pm_runtime_set_autosuspend_delay(&pdev->dev, MEI_ME_RPM_TIMEOUT);
241 pm_runtime_use_autosuspend(&pdev->dev);
242
243 err = mei_register(dev, &pdev->dev);
244 if (err)
245 goto stop;
246
247 pci_set_drvdata(pdev, dev);
248
249 /*
250 * MEI requires to resume from runtime suspend mode
251 * in order to perform link reset flow upon system suspend.
252 */
253 dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_NO_DIRECT_COMPLETE);
254
255 /*
256 * ME maps runtime suspend/resume to D0i states,
257 * hence we need to go around native PCI runtime service which
258 * eventually brings the device into D3cold/hot state,
259 * but the mei device cannot wake up from D3 unlike from D0i3.
260 * To get around the PCI device native runtime pm,
261 * ME uses runtime pm domain handlers which take precedence
262 * over the driver's pm handlers.
263 */
264 mei_me_set_pm_domain(dev);
265
266 if (mei_pg_is_enabled(dev)) {
267 pm_runtime_put_noidle(&pdev->dev);
268 if (hw->d0i3_supported)
269 pm_runtime_allow(&pdev->dev);
270 }
271
272 dev_dbg(&pdev->dev, "initialization successful.\n");
273
274 return 0;
275
276stop:
277 mei_stop(dev);
278release_irq:
279 mei_cancel_work(dev);
280 mei_disable_interrupts(dev);
281 free_irq(pdev->irq, dev);
282end:
283 dev_err(&pdev->dev, "initialization failed.\n");
284 return err;
285}
286
287/**
288 * mei_me_shutdown - Device Removal Routine
289 *
290 * @pdev: PCI device structure
291 *
292 * mei_me_shutdown is called from the reboot notifier
293 * it's a simplified version of remove so we go down
294 * faster.
295 */
296static void mei_me_shutdown(struct pci_dev *pdev)
297{
298 struct mei_device *dev;
299
300 dev = pci_get_drvdata(pdev);
301 if (!dev)
302 return;
303
304 dev_dbg(&pdev->dev, "shutdown\n");
305 mei_stop(dev);
306
307 mei_me_unset_pm_domain(dev);
308
309 mei_disable_interrupts(dev);
310 free_irq(pdev->irq, dev);
311}
312
313/**
314 * mei_me_remove - Device Removal Routine
315 *
316 * @pdev: PCI device structure
317 *
318 * mei_me_remove is called by the PCI subsystem to alert the driver
319 * that it should release a PCI device.
320 */
321static void mei_me_remove(struct pci_dev *pdev)
322{
323 struct mei_device *dev;
324
325 dev = pci_get_drvdata(pdev);
326 if (!dev)
327 return;
328
329 if (mei_pg_is_enabled(dev))
330 pm_runtime_get_noresume(&pdev->dev);
331
332 dev_dbg(&pdev->dev, "stop\n");
333 mei_stop(dev);
334
335 mei_me_unset_pm_domain(dev);
336
337 mei_disable_interrupts(dev);
338
339 free_irq(pdev->irq, dev);
340
341 mei_deregister(dev);
342}
343
344#ifdef CONFIG_PM_SLEEP
345static int mei_me_pci_suspend(struct device *device)
346{
347 struct pci_dev *pdev = to_pci_dev(device);
348 struct mei_device *dev = pci_get_drvdata(pdev);
349
350 if (!dev)
351 return -ENODEV;
352
353 dev_dbg(&pdev->dev, "suspend\n");
354
355 mei_stop(dev);
356
357 mei_disable_interrupts(dev);
358
359 free_irq(pdev->irq, dev);
360 pci_disable_msi(pdev);
361
362 return 0;
363}
364
365static int mei_me_pci_resume(struct device *device)
366{
367 struct pci_dev *pdev = to_pci_dev(device);
368 struct mei_device *dev;
369 unsigned int irqflags;
370 int err;
371
372 dev = pci_get_drvdata(pdev);
373 if (!dev)
374 return -ENODEV;
375
376 pci_enable_msi(pdev);
377
378 irqflags = pci_dev_msi_enabled(pdev) ? IRQF_ONESHOT : IRQF_SHARED;
379
380 /* request and enable interrupt */
381 err = request_threaded_irq(pdev->irq,
382 mei_me_irq_quick_handler,
383 mei_me_irq_thread_handler,
384 irqflags, KBUILD_MODNAME, dev);
385
386 if (err) {
387 dev_err(&pdev->dev, "request_threaded_irq failed: irq = %d.\n",
388 pdev->irq);
389 return err;
390 }
391
392 err = mei_restart(dev);
393 if (err)
394 return err;
395
396 /* Start timer if stopped in suspend */
397 schedule_delayed_work(&dev->timer_work, HZ);
398
399 return 0;
400}
401#endif /* CONFIG_PM_SLEEP */
402
403#ifdef CONFIG_PM
404static int mei_me_pm_runtime_idle(struct device *device)
405{
406 struct mei_device *dev;
407
408 dev_dbg(device, "rpm: me: runtime_idle\n");
409
410 dev = dev_get_drvdata(device);
411 if (!dev)
412 return -ENODEV;
413 if (mei_write_is_idle(dev))
414 pm_runtime_autosuspend(device);
415
416 return -EBUSY;
417}
418
419static int mei_me_pm_runtime_suspend(struct device *device)
420{
421 struct mei_device *dev;
422 int ret;
423
424 dev_dbg(device, "rpm: me: runtime suspend\n");
425
426 dev = dev_get_drvdata(device);
427 if (!dev)
428 return -ENODEV;
429
430 mutex_lock(&dev->device_lock);
431
432 if (mei_write_is_idle(dev))
433 ret = mei_me_pg_enter_sync(dev);
434 else
435 ret = -EAGAIN;
436
437 mutex_unlock(&dev->device_lock);
438
439 dev_dbg(device, "rpm: me: runtime suspend ret=%d\n", ret);
440
441 if (ret && ret != -EAGAIN)
442 schedule_work(&dev->reset_work);
443
444 return ret;
445}
446
447static int mei_me_pm_runtime_resume(struct device *device)
448{
449 struct mei_device *dev;
450 int ret;
451
452 dev_dbg(device, "rpm: me: runtime resume\n");
453
454 dev = dev_get_drvdata(device);
455 if (!dev)
456 return -ENODEV;
457
458 mutex_lock(&dev->device_lock);
459
460 ret = mei_me_pg_exit_sync(dev);
461
462 mutex_unlock(&dev->device_lock);
463
464 dev_dbg(device, "rpm: me: runtime resume ret = %d\n", ret);
465
466 if (ret)
467 schedule_work(&dev->reset_work);
468
469 return ret;
470}
471
472/**
473 * mei_me_set_pm_domain - fill and set pm domain structure for device
474 *
475 * @dev: mei_device
476 */
477static inline void mei_me_set_pm_domain(struct mei_device *dev)
478{
479 struct pci_dev *pdev = to_pci_dev(dev->dev);
480
481 if (pdev->dev.bus && pdev->dev.bus->pm) {
482 dev->pg_domain.ops = *pdev->dev.bus->pm;
483
484 dev->pg_domain.ops.runtime_suspend = mei_me_pm_runtime_suspend;
485 dev->pg_domain.ops.runtime_resume = mei_me_pm_runtime_resume;
486 dev->pg_domain.ops.runtime_idle = mei_me_pm_runtime_idle;
487
488 dev_pm_domain_set(&pdev->dev, &dev->pg_domain);
489 }
490}
491
492/**
493 * mei_me_unset_pm_domain - clean pm domain structure for device
494 *
495 * @dev: mei_device
496 */
497static inline void mei_me_unset_pm_domain(struct mei_device *dev)
498{
499 /* stop using pm callbacks if any */
500 dev_pm_domain_set(dev->dev, NULL);
501}
502
503static const struct dev_pm_ops mei_me_pm_ops = {
504 SET_SYSTEM_SLEEP_PM_OPS(mei_me_pci_suspend,
505 mei_me_pci_resume)
506 SET_RUNTIME_PM_OPS(
507 mei_me_pm_runtime_suspend,
508 mei_me_pm_runtime_resume,
509 mei_me_pm_runtime_idle)
510};
511
512#define MEI_ME_PM_OPS (&mei_me_pm_ops)
513#else
514#define MEI_ME_PM_OPS NULL
515#endif /* CONFIG_PM */
516/*
517 * PCI driver structure
518 */
519static struct pci_driver mei_me_driver = {
520 .name = KBUILD_MODNAME,
521 .id_table = mei_me_pci_tbl,
522 .probe = mei_me_probe,
523 .remove = mei_me_remove,
524 .shutdown = mei_me_shutdown,
525 .driver.pm = MEI_ME_PM_OPS,
526 .driver.probe_type = PROBE_PREFER_ASYNCHRONOUS,
527};
528
529module_pci_driver(mei_me_driver);
530
531MODULE_AUTHOR("Intel Corporation");
532MODULE_DESCRIPTION("Intel(R) Management Engine Interface");
533MODULE_LICENSE("GPL v2");