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1/*
2 * PCI Express Hot Plug Controller Driver
3 *
4 * Copyright (C) 1995,2001 Compaq Computer Corporation
5 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
6 * Copyright (C) 2001 IBM Corp.
7 * Copyright (C) 2003-2004 Intel Corporation
8 *
9 * All rights reserved.
10 *
11 * This program is free software; you can redistribute it and/or modify
12 * it under the terms of the GNU General Public License as published by
13 * the Free Software Foundation; either version 2 of the License, or (at
14 * your option) any later version.
15 *
16 * This program is distributed in the hope that it will be useful, but
17 * WITHOUT ANY WARRANTY; without even the implied warranty of
18 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
19 * NON INFRINGEMENT. See the GNU General Public License for more
20 * details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, write to the Free Software
24 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
25 *
26 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
27 *
28 */
29
30#include <linux/module.h>
31#include <linux/kernel.h>
32#include <linux/types.h>
33#include <linux/slab.h>
34#include <linux/pci.h>
35#include "../pci.h"
36#include "pciehp.h"
37
38static void interrupt_event_handler(struct work_struct *work);
39
40static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
41{
42 struct event_info *info;
43
44 info = kmalloc(sizeof(*info), GFP_ATOMIC);
45 if (!info)
46 return -ENOMEM;
47
48 info->event_type = event_type;
49 info->p_slot = p_slot;
50 INIT_WORK(&info->work, interrupt_event_handler);
51
52 queue_work(p_slot->wq, &info->work);
53
54 return 0;
55}
56
57u8 pciehp_handle_attention_button(struct slot *p_slot)
58{
59 u32 event_type;
60 struct controller *ctrl = p_slot->ctrl;
61
62 /* Attention Button Change */
63 ctrl_dbg(ctrl, "Attention button interrupt received\n");
64
65 /*
66 * Button pressed - See if need to TAKE ACTION!!!
67 */
68 ctrl_info(ctrl, "Button pressed on Slot(%s)\n", slot_name(p_slot));
69 event_type = INT_BUTTON_PRESS;
70
71 queue_interrupt_event(p_slot, event_type);
72
73 return 0;
74}
75
76u8 pciehp_handle_switch_change(struct slot *p_slot)
77{
78 u8 getstatus;
79 u32 event_type;
80 struct controller *ctrl = p_slot->ctrl;
81
82 /* Switch Change */
83 ctrl_dbg(ctrl, "Switch interrupt received\n");
84
85 pciehp_get_latch_status(p_slot, &getstatus);
86 if (getstatus) {
87 /*
88 * Switch opened
89 */
90 ctrl_info(ctrl, "Latch open on Slot(%s)\n", slot_name(p_slot));
91 event_type = INT_SWITCH_OPEN;
92 } else {
93 /*
94 * Switch closed
95 */
96 ctrl_info(ctrl, "Latch close on Slot(%s)\n", slot_name(p_slot));
97 event_type = INT_SWITCH_CLOSE;
98 }
99
100 queue_interrupt_event(p_slot, event_type);
101
102 return 1;
103}
104
105u8 pciehp_handle_presence_change(struct slot *p_slot)
106{
107 u32 event_type;
108 u8 presence_save;
109 struct controller *ctrl = p_slot->ctrl;
110
111 /* Presence Change */
112 ctrl_dbg(ctrl, "Presence/Notify input change\n");
113
114 /* Switch is open, assume a presence change
115 * Save the presence state
116 */
117 pciehp_get_adapter_status(p_slot, &presence_save);
118 if (presence_save) {
119 /*
120 * Card Present
121 */
122 ctrl_info(ctrl, "Card present on Slot(%s)\n", slot_name(p_slot));
123 event_type = INT_PRESENCE_ON;
124 } else {
125 /*
126 * Not Present
127 */
128 ctrl_info(ctrl, "Card not present on Slot(%s)\n",
129 slot_name(p_slot));
130 event_type = INT_PRESENCE_OFF;
131 }
132
133 queue_interrupt_event(p_slot, event_type);
134
135 return 1;
136}
137
138u8 pciehp_handle_power_fault(struct slot *p_slot)
139{
140 u32 event_type;
141 struct controller *ctrl = p_slot->ctrl;
142
143 /* power fault */
144 ctrl_dbg(ctrl, "Power fault interrupt received\n");
145 ctrl_err(ctrl, "Power fault on slot %s\n", slot_name(p_slot));
146 event_type = INT_POWER_FAULT;
147 ctrl_info(ctrl, "Power fault bit %x set\n", 0);
148 queue_interrupt_event(p_slot, event_type);
149
150 return 1;
151}
152
153void pciehp_handle_linkstate_change(struct slot *p_slot)
154{
155 u32 event_type;
156 struct controller *ctrl = p_slot->ctrl;
157
158 /* Link Status Change */
159 ctrl_dbg(ctrl, "Data Link Layer State change\n");
160
161 if (pciehp_check_link_active(ctrl)) {
162 ctrl_info(ctrl, "slot(%s): Link Up event\n",
163 slot_name(p_slot));
164 event_type = INT_LINK_UP;
165 } else {
166 ctrl_info(ctrl, "slot(%s): Link Down event\n",
167 slot_name(p_slot));
168 event_type = INT_LINK_DOWN;
169 }
170
171 queue_interrupt_event(p_slot, event_type);
172}
173
174/* The following routines constitute the bulk of the
175 hotplug controller logic
176 */
177
178static void set_slot_off(struct controller *ctrl, struct slot * pslot)
179{
180 /* turn off slot, turn on Amber LED, turn off Green LED if supported*/
181 if (POWER_CTRL(ctrl)) {
182 pciehp_power_off_slot(pslot);
183
184 /*
185 * After turning power off, we must wait for at least 1 second
186 * before taking any action that relies on power having been
187 * removed from the slot/adapter.
188 */
189 msleep(1000);
190 }
191
192 pciehp_green_led_off(pslot);
193 pciehp_set_attention_status(pslot, 1);
194}
195
196/**
197 * board_added - Called after a board has been added to the system.
198 * @p_slot: &slot where board is added
199 *
200 * Turns power on for the board.
201 * Configures board.
202 */
203static int board_added(struct slot *p_slot)
204{
205 int retval = 0;
206 struct controller *ctrl = p_slot->ctrl;
207 struct pci_bus *parent = ctrl->pcie->port->subordinate;
208
209 if (POWER_CTRL(ctrl)) {
210 /* Power on slot */
211 retval = pciehp_power_on_slot(p_slot);
212 if (retval)
213 return retval;
214 }
215
216 pciehp_green_led_blink(p_slot);
217
218 /* Check link training status */
219 retval = pciehp_check_link_status(ctrl);
220 if (retval) {
221 ctrl_err(ctrl, "Failed to check link status\n");
222 goto err_exit;
223 }
224
225 /* Check for a power fault */
226 if (ctrl->power_fault_detected || pciehp_query_power_fault(p_slot)) {
227 ctrl_err(ctrl, "Power fault on slot %s\n", slot_name(p_slot));
228 retval = -EIO;
229 goto err_exit;
230 }
231
232 retval = pciehp_configure_device(p_slot);
233 if (retval) {
234 ctrl_err(ctrl, "Cannot add device at %04x:%02x:00\n",
235 pci_domain_nr(parent), parent->number);
236 if (retval != -EEXIST)
237 goto err_exit;
238 }
239
240 pciehp_green_led_on(p_slot);
241 return 0;
242
243err_exit:
244 set_slot_off(ctrl, p_slot);
245 return retval;
246}
247
248/**
249 * remove_board - Turns off slot and LEDs
250 * @p_slot: slot where board is being removed
251 */
252static int remove_board(struct slot *p_slot)
253{
254 int retval;
255 struct controller *ctrl = p_slot->ctrl;
256
257 retval = pciehp_unconfigure_device(p_slot);
258 if (retval)
259 return retval;
260
261 if (POWER_CTRL(ctrl)) {
262 pciehp_power_off_slot(p_slot);
263
264 /*
265 * After turning power off, we must wait for at least 1 second
266 * before taking any action that relies on power having been
267 * removed from the slot/adapter.
268 */
269 msleep(1000);
270 }
271
272 /* turn off Green LED */
273 pciehp_green_led_off(p_slot);
274 return 0;
275}
276
277struct power_work_info {
278 struct slot *p_slot;
279 struct work_struct work;
280 unsigned int req;
281#define DISABLE_REQ 0
282#define ENABLE_REQ 1
283};
284
285/**
286 * pciehp_power_thread - handle pushbutton events
287 * @work: &struct work_struct describing work to be done
288 *
289 * Scheduled procedure to handle blocking stuff for the pushbuttons.
290 * Handles all pending events and exits.
291 */
292static void pciehp_power_thread(struct work_struct *work)
293{
294 struct power_work_info *info =
295 container_of(work, struct power_work_info, work);
296 struct slot *p_slot = info->p_slot;
297 int ret;
298
299 switch (info->req) {
300 case DISABLE_REQ:
301 ctrl_dbg(p_slot->ctrl,
302 "Disabling domain:bus:device=%04x:%02x:00\n",
303 pci_domain_nr(p_slot->ctrl->pcie->port->subordinate),
304 p_slot->ctrl->pcie->port->subordinate->number);
305 mutex_lock(&p_slot->hotplug_lock);
306 pciehp_disable_slot(p_slot);
307 mutex_unlock(&p_slot->hotplug_lock);
308 mutex_lock(&p_slot->lock);
309 p_slot->state = STATIC_STATE;
310 mutex_unlock(&p_slot->lock);
311 break;
312 case ENABLE_REQ:
313 ctrl_dbg(p_slot->ctrl,
314 "Enabling domain:bus:device=%04x:%02x:00\n",
315 pci_domain_nr(p_slot->ctrl->pcie->port->subordinate),
316 p_slot->ctrl->pcie->port->subordinate->number);
317 mutex_lock(&p_slot->hotplug_lock);
318 ret = pciehp_enable_slot(p_slot);
319 mutex_unlock(&p_slot->hotplug_lock);
320 if (ret)
321 pciehp_green_led_off(p_slot);
322 mutex_lock(&p_slot->lock);
323 p_slot->state = STATIC_STATE;
324 mutex_unlock(&p_slot->lock);
325 break;
326 default:
327 break;
328 }
329
330 kfree(info);
331}
332
333void pciehp_queue_pushbutton_work(struct work_struct *work)
334{
335 struct slot *p_slot = container_of(work, struct slot, work.work);
336 struct power_work_info *info;
337
338 info = kmalloc(sizeof(*info), GFP_KERNEL);
339 if (!info) {
340 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
341 __func__);
342 return;
343 }
344 info->p_slot = p_slot;
345 INIT_WORK(&info->work, pciehp_power_thread);
346
347 mutex_lock(&p_slot->lock);
348 switch (p_slot->state) {
349 case BLINKINGOFF_STATE:
350 p_slot->state = POWEROFF_STATE;
351 info->req = DISABLE_REQ;
352 break;
353 case BLINKINGON_STATE:
354 p_slot->state = POWERON_STATE;
355 info->req = ENABLE_REQ;
356 break;
357 default:
358 kfree(info);
359 goto out;
360 }
361 queue_work(p_slot->wq, &info->work);
362 out:
363 mutex_unlock(&p_slot->lock);
364}
365
366/*
367 * Note: This function must be called with slot->lock held
368 */
369static void handle_button_press_event(struct slot *p_slot)
370{
371 struct controller *ctrl = p_slot->ctrl;
372 u8 getstatus;
373
374 switch (p_slot->state) {
375 case STATIC_STATE:
376 pciehp_get_power_status(p_slot, &getstatus);
377 if (getstatus) {
378 p_slot->state = BLINKINGOFF_STATE;
379 ctrl_info(ctrl,
380 "PCI slot #%s - powering off due to button "
381 "press.\n", slot_name(p_slot));
382 } else {
383 p_slot->state = BLINKINGON_STATE;
384 ctrl_info(ctrl,
385 "PCI slot #%s - powering on due to button "
386 "press.\n", slot_name(p_slot));
387 }
388 /* blink green LED and turn off amber */
389 pciehp_green_led_blink(p_slot);
390 pciehp_set_attention_status(p_slot, 0);
391 queue_delayed_work(p_slot->wq, &p_slot->work, 5*HZ);
392 break;
393 case BLINKINGOFF_STATE:
394 case BLINKINGON_STATE:
395 /*
396 * Cancel if we are still blinking; this means that we
397 * press the attention again before the 5 sec. limit
398 * expires to cancel hot-add or hot-remove
399 */
400 ctrl_info(ctrl, "Button cancel on Slot(%s)\n", slot_name(p_slot));
401 cancel_delayed_work(&p_slot->work);
402 if (p_slot->state == BLINKINGOFF_STATE)
403 pciehp_green_led_on(p_slot);
404 else
405 pciehp_green_led_off(p_slot);
406 pciehp_set_attention_status(p_slot, 0);
407 ctrl_info(ctrl, "PCI slot #%s - action canceled "
408 "due to button press\n", slot_name(p_slot));
409 p_slot->state = STATIC_STATE;
410 break;
411 case POWEROFF_STATE:
412 case POWERON_STATE:
413 /*
414 * Ignore if the slot is on power-on or power-off state;
415 * this means that the previous attention button action
416 * to hot-add or hot-remove is undergoing
417 */
418 ctrl_info(ctrl, "Button ignore on Slot(%s)\n", slot_name(p_slot));
419 break;
420 default:
421 ctrl_warn(ctrl, "Not a valid state\n");
422 break;
423 }
424}
425
426/*
427 * Note: This function must be called with slot->lock held
428 */
429static void handle_surprise_event(struct slot *p_slot)
430{
431 u8 getstatus;
432 struct power_work_info *info;
433
434 info = kmalloc(sizeof(*info), GFP_KERNEL);
435 if (!info) {
436 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
437 __func__);
438 return;
439 }
440 info->p_slot = p_slot;
441 INIT_WORK(&info->work, pciehp_power_thread);
442
443 pciehp_get_adapter_status(p_slot, &getstatus);
444 if (!getstatus) {
445 p_slot->state = POWEROFF_STATE;
446 info->req = DISABLE_REQ;
447 } else {
448 p_slot->state = POWERON_STATE;
449 info->req = ENABLE_REQ;
450 }
451
452 queue_work(p_slot->wq, &info->work);
453}
454
455/*
456 * Note: This function must be called with slot->lock held
457 */
458static void handle_link_event(struct slot *p_slot, u32 event)
459{
460 struct controller *ctrl = p_slot->ctrl;
461 struct power_work_info *info;
462
463 info = kmalloc(sizeof(*info), GFP_KERNEL);
464 if (!info) {
465 ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
466 __func__);
467 return;
468 }
469 info->p_slot = p_slot;
470 info->req = event == INT_LINK_UP ? ENABLE_REQ : DISABLE_REQ;
471 INIT_WORK(&info->work, pciehp_power_thread);
472
473 switch (p_slot->state) {
474 case BLINKINGON_STATE:
475 case BLINKINGOFF_STATE:
476 cancel_delayed_work(&p_slot->work);
477 /* Fall through */
478 case STATIC_STATE:
479 p_slot->state = event == INT_LINK_UP ?
480 POWERON_STATE : POWEROFF_STATE;
481 queue_work(p_slot->wq, &info->work);
482 break;
483 case POWERON_STATE:
484 if (event == INT_LINK_UP) {
485 ctrl_info(ctrl,
486 "Link Up event ignored on slot(%s): already powering on\n",
487 slot_name(p_slot));
488 kfree(info);
489 } else {
490 ctrl_info(ctrl,
491 "Link Down event queued on slot(%s): currently getting powered on\n",
492 slot_name(p_slot));
493 p_slot->state = POWEROFF_STATE;
494 queue_work(p_slot->wq, &info->work);
495 }
496 break;
497 case POWEROFF_STATE:
498 if (event == INT_LINK_UP) {
499 ctrl_info(ctrl,
500 "Link Up event queued on slot(%s): currently getting powered off\n",
501 slot_name(p_slot));
502 p_slot->state = POWERON_STATE;
503 queue_work(p_slot->wq, &info->work);
504 } else {
505 ctrl_info(ctrl,
506 "Link Down event ignored on slot(%s): already powering off\n",
507 slot_name(p_slot));
508 kfree(info);
509 }
510 break;
511 default:
512 ctrl_err(ctrl, "Not a valid state on slot(%s)\n",
513 slot_name(p_slot));
514 kfree(info);
515 break;
516 }
517}
518
519static void interrupt_event_handler(struct work_struct *work)
520{
521 struct event_info *info = container_of(work, struct event_info, work);
522 struct slot *p_slot = info->p_slot;
523 struct controller *ctrl = p_slot->ctrl;
524
525 mutex_lock(&p_slot->lock);
526 switch (info->event_type) {
527 case INT_BUTTON_PRESS:
528 handle_button_press_event(p_slot);
529 break;
530 case INT_POWER_FAULT:
531 if (!POWER_CTRL(ctrl))
532 break;
533 pciehp_set_attention_status(p_slot, 1);
534 pciehp_green_led_off(p_slot);
535 break;
536 case INT_PRESENCE_ON:
537 if (!HP_SUPR_RM(ctrl))
538 break;
539 ctrl_dbg(ctrl, "Surprise Insertion\n");
540 handle_surprise_event(p_slot);
541 break;
542 case INT_PRESENCE_OFF:
543 /*
544 * Regardless of surprise capability, we need to
545 * definitely remove a card that has been pulled out!
546 */
547 ctrl_dbg(ctrl, "Surprise Removal\n");
548 handle_surprise_event(p_slot);
549 break;
550 case INT_LINK_UP:
551 case INT_LINK_DOWN:
552 handle_link_event(p_slot, info->event_type);
553 break;
554 default:
555 break;
556 }
557 mutex_unlock(&p_slot->lock);
558
559 kfree(info);
560}
561
562/*
563 * Note: This function must be called with slot->hotplug_lock held
564 */
565int pciehp_enable_slot(struct slot *p_slot)
566{
567 u8 getstatus = 0;
568 int rc;
569 struct controller *ctrl = p_slot->ctrl;
570
571 pciehp_get_adapter_status(p_slot, &getstatus);
572 if (!getstatus) {
573 ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
574 return -ENODEV;
575 }
576 if (MRL_SENS(p_slot->ctrl)) {
577 pciehp_get_latch_status(p_slot, &getstatus);
578 if (getstatus) {
579 ctrl_info(ctrl, "Latch open on slot(%s)\n",
580 slot_name(p_slot));
581 return -ENODEV;
582 }
583 }
584
585 if (POWER_CTRL(p_slot->ctrl)) {
586 pciehp_get_power_status(p_slot, &getstatus);
587 if (getstatus) {
588 ctrl_info(ctrl, "Already enabled on slot(%s)\n",
589 slot_name(p_slot));
590 return -EINVAL;
591 }
592 }
593
594 pciehp_get_latch_status(p_slot, &getstatus);
595
596 rc = board_added(p_slot);
597 if (rc)
598 pciehp_get_latch_status(p_slot, &getstatus);
599
600 return rc;
601}
602
603/*
604 * Note: This function must be called with slot->hotplug_lock held
605 */
606int pciehp_disable_slot(struct slot *p_slot)
607{
608 u8 getstatus = 0;
609 struct controller *ctrl = p_slot->ctrl;
610
611 if (!p_slot->ctrl)
612 return 1;
613
614 if (POWER_CTRL(p_slot->ctrl)) {
615 pciehp_get_power_status(p_slot, &getstatus);
616 if (!getstatus) {
617 ctrl_info(ctrl, "Already disabled on slot(%s)\n",
618 slot_name(p_slot));
619 return -EINVAL;
620 }
621 }
622
623 return remove_board(p_slot);
624}
625
626int pciehp_sysfs_enable_slot(struct slot *p_slot)
627{
628 int retval = -ENODEV;
629 struct controller *ctrl = p_slot->ctrl;
630
631 mutex_lock(&p_slot->lock);
632 switch (p_slot->state) {
633 case BLINKINGON_STATE:
634 cancel_delayed_work(&p_slot->work);
635 case STATIC_STATE:
636 p_slot->state = POWERON_STATE;
637 mutex_unlock(&p_slot->lock);
638 mutex_lock(&p_slot->hotplug_lock);
639 retval = pciehp_enable_slot(p_slot);
640 mutex_unlock(&p_slot->hotplug_lock);
641 mutex_lock(&p_slot->lock);
642 p_slot->state = STATIC_STATE;
643 break;
644 case POWERON_STATE:
645 ctrl_info(ctrl, "Slot %s is already in powering on state\n",
646 slot_name(p_slot));
647 break;
648 case BLINKINGOFF_STATE:
649 case POWEROFF_STATE:
650 ctrl_info(ctrl, "Already enabled on slot %s\n",
651 slot_name(p_slot));
652 break;
653 default:
654 ctrl_err(ctrl, "Not a valid state on slot %s\n",
655 slot_name(p_slot));
656 break;
657 }
658 mutex_unlock(&p_slot->lock);
659
660 return retval;
661}
662
663int pciehp_sysfs_disable_slot(struct slot *p_slot)
664{
665 int retval = -ENODEV;
666 struct controller *ctrl = p_slot->ctrl;
667
668 mutex_lock(&p_slot->lock);
669 switch (p_slot->state) {
670 case BLINKINGOFF_STATE:
671 cancel_delayed_work(&p_slot->work);
672 case STATIC_STATE:
673 p_slot->state = POWEROFF_STATE;
674 mutex_unlock(&p_slot->lock);
675 retval = pciehp_disable_slot(p_slot);
676 mutex_lock(&p_slot->lock);
677 p_slot->state = STATIC_STATE;
678 break;
679 case POWEROFF_STATE:
680 ctrl_info(ctrl, "Slot %s is already in powering off state\n",
681 slot_name(p_slot));
682 break;
683 case BLINKINGON_STATE:
684 case POWERON_STATE:
685 ctrl_info(ctrl, "Already disabled on slot %s\n",
686 slot_name(p_slot));
687 break;
688 default:
689 ctrl_err(ctrl, "Not a valid state on slot %s\n",
690 slot_name(p_slot));
691 break;
692 }
693 mutex_unlock(&p_slot->lock);
694
695 return retval;
696}
1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * PCI Express Hot Plug Controller Driver
4 *
5 * Copyright (C) 1995,2001 Compaq Computer Corporation
6 * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
7 * Copyright (C) 2001 IBM Corp.
8 * Copyright (C) 2003-2004 Intel Corporation
9 *
10 * All rights reserved.
11 *
12 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
13 *
14 */
15
16#define dev_fmt(fmt) "pciehp: " fmt
17
18#include <linux/kernel.h>
19#include <linux/types.h>
20#include <linux/pm_runtime.h>
21#include <linux/pci.h>
22#include "pciehp.h"
23
24/* The following routines constitute the bulk of the
25 hotplug controller logic
26 */
27
28#define SAFE_REMOVAL true
29#define SURPRISE_REMOVAL false
30
31static void set_slot_off(struct controller *ctrl)
32{
33 /*
34 * Turn off slot, turn on attention indicator, turn off power
35 * indicator
36 */
37 if (POWER_CTRL(ctrl)) {
38 pciehp_power_off_slot(ctrl);
39
40 /*
41 * After turning power off, we must wait for at least 1 second
42 * before taking any action that relies on power having been
43 * removed from the slot/adapter.
44 */
45 msleep(1000);
46 }
47
48 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
49 PCI_EXP_SLTCTL_ATTN_IND_ON);
50}
51
52/**
53 * board_added - Called after a board has been added to the system.
54 * @ctrl: PCIe hotplug controller where board is added
55 *
56 * Turns power on for the board.
57 * Configures board.
58 */
59static int board_added(struct controller *ctrl)
60{
61 int retval = 0;
62 struct pci_bus *parent = ctrl->pcie->port->subordinate;
63
64 if (POWER_CTRL(ctrl)) {
65 /* Power on slot */
66 retval = pciehp_power_on_slot(ctrl);
67 if (retval)
68 return retval;
69 }
70
71 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK,
72 INDICATOR_NOOP);
73
74 /* Check link training status */
75 retval = pciehp_check_link_status(ctrl);
76 if (retval) {
77 ctrl_err(ctrl, "Failed to check link status\n");
78 goto err_exit;
79 }
80
81 /* Check for a power fault */
82 if (ctrl->power_fault_detected || pciehp_query_power_fault(ctrl)) {
83 ctrl_err(ctrl, "Slot(%s): Power fault\n", slot_name(ctrl));
84 retval = -EIO;
85 goto err_exit;
86 }
87
88 retval = pciehp_configure_device(ctrl);
89 if (retval) {
90 if (retval != -EEXIST) {
91 ctrl_err(ctrl, "Cannot add device at %04x:%02x:00\n",
92 pci_domain_nr(parent), parent->number);
93 goto err_exit;
94 }
95 }
96
97 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON,
98 PCI_EXP_SLTCTL_ATTN_IND_OFF);
99 return 0;
100
101err_exit:
102 set_slot_off(ctrl);
103 return retval;
104}
105
106/**
107 * remove_board - Turn off slot and Power Indicator
108 * @ctrl: PCIe hotplug controller where board is being removed
109 * @safe_removal: whether the board is safely removed (versus surprise removed)
110 */
111static void remove_board(struct controller *ctrl, bool safe_removal)
112{
113 pciehp_unconfigure_device(ctrl, safe_removal);
114
115 if (POWER_CTRL(ctrl)) {
116 pciehp_power_off_slot(ctrl);
117
118 /*
119 * After turning power off, we must wait for at least 1 second
120 * before taking any action that relies on power having been
121 * removed from the slot/adapter.
122 */
123 msleep(1000);
124
125 /* Ignore link or presence changes caused by power off */
126 atomic_and(~(PCI_EXP_SLTSTA_DLLSC | PCI_EXP_SLTSTA_PDC),
127 &ctrl->pending_events);
128 }
129
130 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
131 INDICATOR_NOOP);
132}
133
134static int pciehp_enable_slot(struct controller *ctrl);
135static int pciehp_disable_slot(struct controller *ctrl, bool safe_removal);
136
137void pciehp_request(struct controller *ctrl, int action)
138{
139 atomic_or(action, &ctrl->pending_events);
140 if (!pciehp_poll_mode)
141 irq_wake_thread(ctrl->pcie->irq, ctrl);
142}
143
144void pciehp_queue_pushbutton_work(struct work_struct *work)
145{
146 struct controller *ctrl = container_of(work, struct controller,
147 button_work.work);
148
149 mutex_lock(&ctrl->state_lock);
150 switch (ctrl->state) {
151 case BLINKINGOFF_STATE:
152 pciehp_request(ctrl, DISABLE_SLOT);
153 break;
154 case BLINKINGON_STATE:
155 pciehp_request(ctrl, PCI_EXP_SLTSTA_PDC);
156 break;
157 default:
158 break;
159 }
160 mutex_unlock(&ctrl->state_lock);
161}
162
163void pciehp_handle_button_press(struct controller *ctrl)
164{
165 mutex_lock(&ctrl->state_lock);
166 switch (ctrl->state) {
167 case OFF_STATE:
168 case ON_STATE:
169 if (ctrl->state == ON_STATE) {
170 ctrl->state = BLINKINGOFF_STATE;
171 ctrl_info(ctrl, "Slot(%s): Powering off due to button press\n",
172 slot_name(ctrl));
173 } else {
174 ctrl->state = BLINKINGON_STATE;
175 ctrl_info(ctrl, "Slot(%s) Powering on due to button press\n",
176 slot_name(ctrl));
177 }
178 /* blink power indicator and turn off attention */
179 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK,
180 PCI_EXP_SLTCTL_ATTN_IND_OFF);
181 schedule_delayed_work(&ctrl->button_work, 5 * HZ);
182 break;
183 case BLINKINGOFF_STATE:
184 case BLINKINGON_STATE:
185 /*
186 * Cancel if we are still blinking; this means that we
187 * press the attention again before the 5 sec. limit
188 * expires to cancel hot-add or hot-remove
189 */
190 ctrl_info(ctrl, "Slot(%s): Button cancel\n", slot_name(ctrl));
191 cancel_delayed_work(&ctrl->button_work);
192 if (ctrl->state == BLINKINGOFF_STATE) {
193 ctrl->state = ON_STATE;
194 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON,
195 PCI_EXP_SLTCTL_ATTN_IND_OFF);
196 } else {
197 ctrl->state = OFF_STATE;
198 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
199 PCI_EXP_SLTCTL_ATTN_IND_OFF);
200 }
201 ctrl_info(ctrl, "Slot(%s): Action canceled due to button press\n",
202 slot_name(ctrl));
203 break;
204 default:
205 ctrl_err(ctrl, "Slot(%s): Ignoring invalid state %#x\n",
206 slot_name(ctrl), ctrl->state);
207 break;
208 }
209 mutex_unlock(&ctrl->state_lock);
210}
211
212void pciehp_handle_disable_request(struct controller *ctrl)
213{
214 mutex_lock(&ctrl->state_lock);
215 switch (ctrl->state) {
216 case BLINKINGON_STATE:
217 case BLINKINGOFF_STATE:
218 cancel_delayed_work(&ctrl->button_work);
219 break;
220 }
221 ctrl->state = POWEROFF_STATE;
222 mutex_unlock(&ctrl->state_lock);
223
224 ctrl->request_result = pciehp_disable_slot(ctrl, SAFE_REMOVAL);
225}
226
227void pciehp_handle_presence_or_link_change(struct controller *ctrl, u32 events)
228{
229 int present, link_active;
230
231 /*
232 * If the slot is on and presence or link has changed, turn it off.
233 * Even if it's occupied again, we cannot assume the card is the same.
234 */
235 mutex_lock(&ctrl->state_lock);
236 switch (ctrl->state) {
237 case BLINKINGOFF_STATE:
238 cancel_delayed_work(&ctrl->button_work);
239 fallthrough;
240 case ON_STATE:
241 ctrl->state = POWEROFF_STATE;
242 mutex_unlock(&ctrl->state_lock);
243 if (events & PCI_EXP_SLTSTA_DLLSC)
244 ctrl_info(ctrl, "Slot(%s): Link Down\n",
245 slot_name(ctrl));
246 if (events & PCI_EXP_SLTSTA_PDC)
247 ctrl_info(ctrl, "Slot(%s): Card not present\n",
248 slot_name(ctrl));
249 pciehp_disable_slot(ctrl, SURPRISE_REMOVAL);
250 break;
251 default:
252 mutex_unlock(&ctrl->state_lock);
253 break;
254 }
255
256 /* Turn the slot on if it's occupied or link is up */
257 mutex_lock(&ctrl->state_lock);
258 present = pciehp_card_present(ctrl);
259 link_active = pciehp_check_link_active(ctrl);
260 if (present <= 0 && link_active <= 0) {
261 mutex_unlock(&ctrl->state_lock);
262 return;
263 }
264
265 switch (ctrl->state) {
266 case BLINKINGON_STATE:
267 cancel_delayed_work(&ctrl->button_work);
268 fallthrough;
269 case OFF_STATE:
270 ctrl->state = POWERON_STATE;
271 mutex_unlock(&ctrl->state_lock);
272 if (present)
273 ctrl_info(ctrl, "Slot(%s): Card present\n",
274 slot_name(ctrl));
275 if (link_active)
276 ctrl_info(ctrl, "Slot(%s): Link Up\n",
277 slot_name(ctrl));
278 ctrl->request_result = pciehp_enable_slot(ctrl);
279 break;
280 default:
281 mutex_unlock(&ctrl->state_lock);
282 break;
283 }
284}
285
286static int __pciehp_enable_slot(struct controller *ctrl)
287{
288 u8 getstatus = 0;
289
290 if (MRL_SENS(ctrl)) {
291 pciehp_get_latch_status(ctrl, &getstatus);
292 if (getstatus) {
293 ctrl_info(ctrl, "Slot(%s): Latch open\n",
294 slot_name(ctrl));
295 return -ENODEV;
296 }
297 }
298
299 if (POWER_CTRL(ctrl)) {
300 pciehp_get_power_status(ctrl, &getstatus);
301 if (getstatus) {
302 ctrl_info(ctrl, "Slot(%s): Already enabled\n",
303 slot_name(ctrl));
304 return 0;
305 }
306 }
307
308 return board_added(ctrl);
309}
310
311static int pciehp_enable_slot(struct controller *ctrl)
312{
313 int ret;
314
315 pm_runtime_get_sync(&ctrl->pcie->port->dev);
316 ret = __pciehp_enable_slot(ctrl);
317 if (ret && ATTN_BUTTN(ctrl))
318 /* may be blinking */
319 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
320 INDICATOR_NOOP);
321 pm_runtime_put(&ctrl->pcie->port->dev);
322
323 mutex_lock(&ctrl->state_lock);
324 ctrl->state = ret ? OFF_STATE : ON_STATE;
325 mutex_unlock(&ctrl->state_lock);
326
327 return ret;
328}
329
330static int __pciehp_disable_slot(struct controller *ctrl, bool safe_removal)
331{
332 u8 getstatus = 0;
333
334 if (POWER_CTRL(ctrl)) {
335 pciehp_get_power_status(ctrl, &getstatus);
336 if (!getstatus) {
337 ctrl_info(ctrl, "Slot(%s): Already disabled\n",
338 slot_name(ctrl));
339 return -EINVAL;
340 }
341 }
342
343 remove_board(ctrl, safe_removal);
344 return 0;
345}
346
347static int pciehp_disable_slot(struct controller *ctrl, bool safe_removal)
348{
349 int ret;
350
351 pm_runtime_get_sync(&ctrl->pcie->port->dev);
352 ret = __pciehp_disable_slot(ctrl, safe_removal);
353 pm_runtime_put(&ctrl->pcie->port->dev);
354
355 mutex_lock(&ctrl->state_lock);
356 ctrl->state = OFF_STATE;
357 mutex_unlock(&ctrl->state_lock);
358
359 return ret;
360}
361
362int pciehp_sysfs_enable_slot(struct hotplug_slot *hotplug_slot)
363{
364 struct controller *ctrl = to_ctrl(hotplug_slot);
365
366 mutex_lock(&ctrl->state_lock);
367 switch (ctrl->state) {
368 case BLINKINGON_STATE:
369 case OFF_STATE:
370 mutex_unlock(&ctrl->state_lock);
371 /*
372 * The IRQ thread becomes a no-op if the user pulls out the
373 * card before the thread wakes up, so initialize to -ENODEV.
374 */
375 ctrl->request_result = -ENODEV;
376 pciehp_request(ctrl, PCI_EXP_SLTSTA_PDC);
377 wait_event(ctrl->requester,
378 !atomic_read(&ctrl->pending_events) &&
379 !ctrl->ist_running);
380 return ctrl->request_result;
381 case POWERON_STATE:
382 ctrl_info(ctrl, "Slot(%s): Already in powering on state\n",
383 slot_name(ctrl));
384 break;
385 case BLINKINGOFF_STATE:
386 case ON_STATE:
387 case POWEROFF_STATE:
388 ctrl_info(ctrl, "Slot(%s): Already enabled\n",
389 slot_name(ctrl));
390 break;
391 default:
392 ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
393 slot_name(ctrl), ctrl->state);
394 break;
395 }
396 mutex_unlock(&ctrl->state_lock);
397
398 return -ENODEV;
399}
400
401int pciehp_sysfs_disable_slot(struct hotplug_slot *hotplug_slot)
402{
403 struct controller *ctrl = to_ctrl(hotplug_slot);
404
405 mutex_lock(&ctrl->state_lock);
406 switch (ctrl->state) {
407 case BLINKINGOFF_STATE:
408 case ON_STATE:
409 mutex_unlock(&ctrl->state_lock);
410 pciehp_request(ctrl, DISABLE_SLOT);
411 wait_event(ctrl->requester,
412 !atomic_read(&ctrl->pending_events) &&
413 !ctrl->ist_running);
414 return ctrl->request_result;
415 case POWEROFF_STATE:
416 ctrl_info(ctrl, "Slot(%s): Already in powering off state\n",
417 slot_name(ctrl));
418 break;
419 case BLINKINGON_STATE:
420 case OFF_STATE:
421 case POWERON_STATE:
422 ctrl_info(ctrl, "Slot(%s): Already disabled\n",
423 slot_name(ctrl));
424 break;
425 default:
426 ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
427 slot_name(ctrl), ctrl->state);
428 break;
429 }
430 mutex_unlock(&ctrl->state_lock);
431
432 return -ENODEV;
433}