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git.proxmox.com Git - mirror_ubuntu-focal-kernel.git/blob - drivers/pci/hotplug/pciehp_ctrl.c
2 * PCI Express Hot Plug Controller Driver
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
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.
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
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.
26 * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
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>
38 static void interrupt_event_handler(struct work_struct
*work
);
40 void pciehp_queue_interrupt_event(struct slot
*p_slot
, u32 event_type
)
42 struct event_info
*info
;
44 info
= kmalloc(sizeof(*info
), GFP_ATOMIC
);
46 ctrl_err(p_slot
->ctrl
, "dropped event %d (ENOMEM)\n", event_type
);
50 INIT_WORK(&info
->work
, interrupt_event_handler
);
51 info
->event_type
= event_type
;
52 info
->p_slot
= p_slot
;
53 queue_work(p_slot
->wq
, &info
->work
);
56 /* The following routines constitute the bulk of the
57 hotplug controller logic
60 static void set_slot_off(struct controller
*ctrl
, struct slot
*pslot
)
62 /* turn off slot, turn on Amber LED, turn off Green LED if supported*/
63 if (POWER_CTRL(ctrl
)) {
64 pciehp_power_off_slot(pslot
);
67 * After turning power off, we must wait for at least 1 second
68 * before taking any action that relies on power having been
69 * removed from the slot/adapter.
74 pciehp_green_led_off(pslot
);
75 pciehp_set_attention_status(pslot
, 1);
79 * board_added - Called after a board has been added to the system.
80 * @p_slot: &slot where board is added
82 * Turns power on for the board.
85 static int board_added(struct slot
*p_slot
)
88 struct controller
*ctrl
= p_slot
->ctrl
;
89 struct pci_bus
*parent
= ctrl
->pcie
->port
->subordinate
;
91 if (POWER_CTRL(ctrl
)) {
93 retval
= pciehp_power_on_slot(p_slot
);
98 pciehp_green_led_blink(p_slot
);
100 /* Check link training status */
101 retval
= pciehp_check_link_status(ctrl
);
103 ctrl_err(ctrl
, "Failed to check link status\n");
107 /* Check for a power fault */
108 if (ctrl
->power_fault_detected
|| pciehp_query_power_fault(p_slot
)) {
109 ctrl_err(ctrl
, "Power fault on slot %s\n", slot_name(p_slot
));
114 retval
= pciehp_configure_device(p_slot
);
116 ctrl_err(ctrl
, "Cannot add device at %04x:%02x:00\n",
117 pci_domain_nr(parent
), parent
->number
);
118 if (retval
!= -EEXIST
)
122 pciehp_green_led_on(p_slot
);
126 set_slot_off(ctrl
, p_slot
);
131 * remove_board - Turns off slot and LEDs
132 * @p_slot: slot where board is being removed
134 static int remove_board(struct slot
*p_slot
)
137 struct controller
*ctrl
= p_slot
->ctrl
;
139 retval
= pciehp_unconfigure_device(p_slot
);
143 if (POWER_CTRL(ctrl
)) {
144 pciehp_power_off_slot(p_slot
);
147 * After turning power off, we must wait for at least 1 second
148 * before taking any action that relies on power having been
149 * removed from the slot/adapter.
154 /* turn off Green LED */
155 pciehp_green_led_off(p_slot
);
159 struct power_work_info
{
161 struct work_struct work
;
163 #define DISABLE_REQ 0
168 * pciehp_power_thread - handle pushbutton events
169 * @work: &struct work_struct describing work to be done
171 * Scheduled procedure to handle blocking stuff for the pushbuttons.
172 * Handles all pending events and exits.
174 static void pciehp_power_thread(struct work_struct
*work
)
176 struct power_work_info
*info
=
177 container_of(work
, struct power_work_info
, work
);
178 struct slot
*p_slot
= info
->p_slot
;
183 mutex_lock(&p_slot
->hotplug_lock
);
184 pciehp_disable_slot(p_slot
);
185 mutex_unlock(&p_slot
->hotplug_lock
);
186 mutex_lock(&p_slot
->lock
);
187 p_slot
->state
= STATIC_STATE
;
188 mutex_unlock(&p_slot
->lock
);
191 mutex_lock(&p_slot
->hotplug_lock
);
192 ret
= pciehp_enable_slot(p_slot
);
193 mutex_unlock(&p_slot
->hotplug_lock
);
195 pciehp_green_led_off(p_slot
);
196 mutex_lock(&p_slot
->lock
);
197 p_slot
->state
= STATIC_STATE
;
198 mutex_unlock(&p_slot
->lock
);
207 void pciehp_queue_pushbutton_work(struct work_struct
*work
)
209 struct slot
*p_slot
= container_of(work
, struct slot
, work
.work
);
210 struct power_work_info
*info
;
212 info
= kmalloc(sizeof(*info
), GFP_KERNEL
);
214 ctrl_err(p_slot
->ctrl
, "%s: Cannot allocate memory\n",
218 info
->p_slot
= p_slot
;
219 INIT_WORK(&info
->work
, pciehp_power_thread
);
221 mutex_lock(&p_slot
->lock
);
222 switch (p_slot
->state
) {
223 case BLINKINGOFF_STATE
:
224 p_slot
->state
= POWEROFF_STATE
;
225 info
->req
= DISABLE_REQ
;
227 case BLINKINGON_STATE
:
228 p_slot
->state
= POWERON_STATE
;
229 info
->req
= ENABLE_REQ
;
235 queue_work(p_slot
->wq
, &info
->work
);
237 mutex_unlock(&p_slot
->lock
);
241 * Note: This function must be called with slot->lock held
243 static void handle_button_press_event(struct slot
*p_slot
)
245 struct controller
*ctrl
= p_slot
->ctrl
;
248 switch (p_slot
->state
) {
250 pciehp_get_power_status(p_slot
, &getstatus
);
252 p_slot
->state
= BLINKINGOFF_STATE
;
253 ctrl_info(ctrl
, "PCI slot #%s - powering off due to button press\n",
256 p_slot
->state
= BLINKINGON_STATE
;
257 ctrl_info(ctrl
, "PCI slot #%s - powering on due to button press\n",
260 /* blink green LED and turn off amber */
261 pciehp_green_led_blink(p_slot
);
262 pciehp_set_attention_status(p_slot
, 0);
263 queue_delayed_work(p_slot
->wq
, &p_slot
->work
, 5*HZ
);
265 case BLINKINGOFF_STATE
:
266 case BLINKINGON_STATE
:
268 * Cancel if we are still blinking; this means that we
269 * press the attention again before the 5 sec. limit
270 * expires to cancel hot-add or hot-remove
272 ctrl_info(ctrl
, "Button cancel on Slot(%s)\n", slot_name(p_slot
));
273 cancel_delayed_work(&p_slot
->work
);
274 if (p_slot
->state
== BLINKINGOFF_STATE
)
275 pciehp_green_led_on(p_slot
);
277 pciehp_green_led_off(p_slot
);
278 pciehp_set_attention_status(p_slot
, 0);
279 ctrl_info(ctrl
, "PCI slot #%s - action canceled due to button press\n",
281 p_slot
->state
= STATIC_STATE
;
286 * Ignore if the slot is on power-on or power-off state;
287 * this means that the previous attention button action
288 * to hot-add or hot-remove is undergoing
290 ctrl_info(ctrl
, "Button ignore on Slot(%s)\n", slot_name(p_slot
));
293 ctrl_warn(ctrl
, "ignoring invalid state %#x\n", p_slot
->state
);
299 * Note: This function must be called with slot->lock held
301 static void handle_surprise_event(struct slot
*p_slot
)
304 struct power_work_info
*info
;
306 info
= kmalloc(sizeof(*info
), GFP_KERNEL
);
308 ctrl_err(p_slot
->ctrl
, "%s: Cannot allocate memory\n",
312 info
->p_slot
= p_slot
;
313 INIT_WORK(&info
->work
, pciehp_power_thread
);
315 pciehp_get_adapter_status(p_slot
, &getstatus
);
317 p_slot
->state
= POWEROFF_STATE
;
318 info
->req
= DISABLE_REQ
;
320 p_slot
->state
= POWERON_STATE
;
321 info
->req
= ENABLE_REQ
;
324 queue_work(p_slot
->wq
, &info
->work
);
328 * Note: This function must be called with slot->lock held
330 static void handle_link_event(struct slot
*p_slot
, u32 event
)
332 struct controller
*ctrl
= p_slot
->ctrl
;
333 struct power_work_info
*info
;
335 info
= kmalloc(sizeof(*info
), GFP_KERNEL
);
337 ctrl_err(p_slot
->ctrl
, "%s: Cannot allocate memory\n",
341 info
->p_slot
= p_slot
;
342 info
->req
= event
== INT_LINK_UP
? ENABLE_REQ
: DISABLE_REQ
;
343 INIT_WORK(&info
->work
, pciehp_power_thread
);
345 switch (p_slot
->state
) {
346 case BLINKINGON_STATE
:
347 case BLINKINGOFF_STATE
:
348 cancel_delayed_work(&p_slot
->work
);
351 p_slot
->state
= event
== INT_LINK_UP
?
352 POWERON_STATE
: POWEROFF_STATE
;
353 queue_work(p_slot
->wq
, &info
->work
);
356 if (event
== INT_LINK_UP
) {
358 "Link Up event ignored on slot(%s): already powering on\n",
363 "Link Down event queued on slot(%s): currently getting powered on\n",
365 p_slot
->state
= POWEROFF_STATE
;
366 queue_work(p_slot
->wq
, &info
->work
);
370 if (event
== INT_LINK_UP
) {
372 "Link Up event queued on slot(%s): currently getting powered off\n",
374 p_slot
->state
= POWERON_STATE
;
375 queue_work(p_slot
->wq
, &info
->work
);
378 "Link Down event ignored on slot(%s): already powering off\n",
384 ctrl_err(ctrl
, "ignoring invalid state %#x on slot(%s)\n",
385 p_slot
->state
, slot_name(p_slot
));
391 static void interrupt_event_handler(struct work_struct
*work
)
393 struct event_info
*info
= container_of(work
, struct event_info
, work
);
394 struct slot
*p_slot
= info
->p_slot
;
395 struct controller
*ctrl
= p_slot
->ctrl
;
397 mutex_lock(&p_slot
->lock
);
398 switch (info
->event_type
) {
399 case INT_BUTTON_PRESS
:
400 handle_button_press_event(p_slot
);
402 case INT_POWER_FAULT
:
403 if (!POWER_CTRL(ctrl
))
405 pciehp_set_attention_status(p_slot
, 1);
406 pciehp_green_led_off(p_slot
);
408 case INT_PRESENCE_ON
:
409 handle_surprise_event(p_slot
);
411 case INT_PRESENCE_OFF
:
413 * Regardless of surprise capability, we need to
414 * definitely remove a card that has been pulled out!
416 handle_surprise_event(p_slot
);
420 handle_link_event(p_slot
, info
->event_type
);
425 mutex_unlock(&p_slot
->lock
);
431 * Note: This function must be called with slot->hotplug_lock held
433 int pciehp_enable_slot(struct slot
*p_slot
)
437 struct controller
*ctrl
= p_slot
->ctrl
;
439 pciehp_get_adapter_status(p_slot
, &getstatus
);
441 ctrl_info(ctrl
, "No adapter on slot(%s)\n", slot_name(p_slot
));
444 if (MRL_SENS(p_slot
->ctrl
)) {
445 pciehp_get_latch_status(p_slot
, &getstatus
);
447 ctrl_info(ctrl
, "Latch open on slot(%s)\n",
453 if (POWER_CTRL(p_slot
->ctrl
)) {
454 pciehp_get_power_status(p_slot
, &getstatus
);
456 ctrl_info(ctrl
, "Already enabled on slot(%s)\n",
462 pciehp_get_latch_status(p_slot
, &getstatus
);
464 rc
= board_added(p_slot
);
466 pciehp_get_latch_status(p_slot
, &getstatus
);
472 * Note: This function must be called with slot->hotplug_lock held
474 int pciehp_disable_slot(struct slot
*p_slot
)
477 struct controller
*ctrl
= p_slot
->ctrl
;
482 if (POWER_CTRL(p_slot
->ctrl
)) {
483 pciehp_get_power_status(p_slot
, &getstatus
);
485 ctrl_info(ctrl
, "Already disabled on slot(%s)\n",
491 return remove_board(p_slot
);
494 int pciehp_sysfs_enable_slot(struct slot
*p_slot
)
496 int retval
= -ENODEV
;
497 struct controller
*ctrl
= p_slot
->ctrl
;
499 mutex_lock(&p_slot
->lock
);
500 switch (p_slot
->state
) {
501 case BLINKINGON_STATE
:
502 cancel_delayed_work(&p_slot
->work
);
504 p_slot
->state
= POWERON_STATE
;
505 mutex_unlock(&p_slot
->lock
);
506 mutex_lock(&p_slot
->hotplug_lock
);
507 retval
= pciehp_enable_slot(p_slot
);
508 mutex_unlock(&p_slot
->hotplug_lock
);
509 mutex_lock(&p_slot
->lock
);
510 p_slot
->state
= STATIC_STATE
;
513 ctrl_info(ctrl
, "Slot %s is already in powering on state\n",
516 case BLINKINGOFF_STATE
:
518 ctrl_info(ctrl
, "Already enabled on slot %s\n",
522 ctrl_err(ctrl
, "invalid state %#x on slot %s\n",
523 p_slot
->state
, slot_name(p_slot
));
526 mutex_unlock(&p_slot
->lock
);
531 int pciehp_sysfs_disable_slot(struct slot
*p_slot
)
533 int retval
= -ENODEV
;
534 struct controller
*ctrl
= p_slot
->ctrl
;
536 mutex_lock(&p_slot
->lock
);
537 switch (p_slot
->state
) {
538 case BLINKINGOFF_STATE
:
539 cancel_delayed_work(&p_slot
->work
);
541 p_slot
->state
= POWEROFF_STATE
;
542 mutex_unlock(&p_slot
->lock
);
543 retval
= pciehp_disable_slot(p_slot
);
544 mutex_lock(&p_slot
->lock
);
545 p_slot
->state
= STATIC_STATE
;
548 ctrl_info(ctrl
, "Slot %s is already in powering off state\n",
551 case BLINKINGON_STATE
:
553 ctrl_info(ctrl
, "Already disabled on slot %s\n",
557 ctrl_err(ctrl
, "invalid state %#x on slot %s\n",
558 p_slot
->state
, slot_name(p_slot
));
561 mutex_unlock(&p_slot
->lock
);