1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3  * Standard 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 #include <linux/module.h>
17 #include <linux/kernel.h>
18 #include <linux/types.h>
19 #include <linux/slab.h>
20 #include <linux/pci.h>
21 #include "../pci.h"
22 #include "shpchp.h"
23 
24 static void interrupt_event_handler(struct work_struct *work);
25 static int shpchp_enable_slot(struct slot *p_slot);
26 static int shpchp_disable_slot(struct slot *p_slot);
27 
queue_interrupt_event(struct slot * p_slot,u32 event_type)28 static int queue_interrupt_event(struct slot *p_slot, u32 event_type)
29 {
30 	struct event_info *info;
31 
32 	info = kmalloc(sizeof(*info), GFP_ATOMIC);
33 	if (!info)
34 		return -ENOMEM;
35 
36 	info->event_type = event_type;
37 	info->p_slot = p_slot;
38 	INIT_WORK(&info->work, interrupt_event_handler);
39 
40 	queue_work(p_slot->wq, &info->work);
41 
42 	return 0;
43 }
44 
shpchp_handle_attention_button(u8 hp_slot,struct controller * ctrl)45 u8 shpchp_handle_attention_button(u8 hp_slot, struct controller *ctrl)
46 {
47 	struct slot *p_slot;
48 	u32 event_type;
49 
50 	/* Attention Button Change */
51 	ctrl_dbg(ctrl, "Attention button interrupt received\n");
52 
53 	p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
54 	p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
55 
56 	/*
57 	 *  Button pressed - See if need to TAKE ACTION!!!
58 	 */
59 	ctrl_info(ctrl, "Button pressed on Slot(%s)\n", slot_name(p_slot));
60 	event_type = INT_BUTTON_PRESS;
61 
62 	queue_interrupt_event(p_slot, event_type);
63 
64 	return 0;
65 
66 }
67 
shpchp_handle_switch_change(u8 hp_slot,struct controller * ctrl)68 u8 shpchp_handle_switch_change(u8 hp_slot, struct controller *ctrl)
69 {
70 	struct slot *p_slot;
71 	u8 getstatus;
72 	u32 event_type;
73 
74 	/* Switch Change */
75 	ctrl_dbg(ctrl, "Switch interrupt received\n");
76 
77 	p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
78 	p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
79 	p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
80 	ctrl_dbg(ctrl, "Card present %x Power status %x\n",
81 		 p_slot->presence_save, p_slot->pwr_save);
82 
83 	if (getstatus) {
84 		/*
85 		 * Switch opened
86 		 */
87 		ctrl_info(ctrl, "Latch open on Slot(%s)\n", slot_name(p_slot));
88 		event_type = INT_SWITCH_OPEN;
89 		if (p_slot->pwr_save && p_slot->presence_save) {
90 			event_type = INT_POWER_FAULT;
91 			ctrl_err(ctrl, "Surprise Removal of card\n");
92 		}
93 	} else {
94 		/*
95 		 *  Switch closed
96 		 */
97 		ctrl_info(ctrl, "Latch close on Slot(%s)\n", slot_name(p_slot));
98 		event_type = INT_SWITCH_CLOSE;
99 	}
100 
101 	queue_interrupt_event(p_slot, event_type);
102 
103 	return 1;
104 }
105 
shpchp_handle_presence_change(u8 hp_slot,struct controller * ctrl)106 u8 shpchp_handle_presence_change(u8 hp_slot, struct controller *ctrl)
107 {
108 	struct slot *p_slot;
109 	u32 event_type;
110 
111 	/* Presence Change */
112 	ctrl_dbg(ctrl, "Presence/Notify input change\n");
113 
114 	p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
115 
116 	/*
117 	 * Save the presence state
118 	 */
119 	p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
120 	if (p_slot->presence_save) {
121 		/*
122 		 * Card Present
123 		 */
124 		ctrl_info(ctrl, "Card present on Slot(%s)\n",
125 			  slot_name(p_slot));
126 		event_type = INT_PRESENCE_ON;
127 	} else {
128 		/*
129 		 * Not Present
130 		 */
131 		ctrl_info(ctrl, "Card not present on Slot(%s)\n",
132 			  slot_name(p_slot));
133 		event_type = INT_PRESENCE_OFF;
134 	}
135 
136 	queue_interrupt_event(p_slot, event_type);
137 
138 	return 1;
139 }
140 
shpchp_handle_power_fault(u8 hp_slot,struct controller * ctrl)141 u8 shpchp_handle_power_fault(u8 hp_slot, struct controller *ctrl)
142 {
143 	struct slot *p_slot;
144 	u32 event_type;
145 
146 	/* Power fault */
147 	ctrl_dbg(ctrl, "Power fault interrupt received\n");
148 
149 	p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
150 
151 	if (!(p_slot->hpc_ops->query_power_fault(p_slot))) {
152 		/*
153 		 * Power fault Cleared
154 		 */
155 		ctrl_info(ctrl, "Power fault cleared on Slot(%s)\n",
156 			  slot_name(p_slot));
157 		p_slot->status = 0x00;
158 		event_type = INT_POWER_FAULT_CLEAR;
159 	} else {
160 		/*
161 		 *   Power fault
162 		 */
163 		ctrl_info(ctrl, "Power fault on Slot(%s)\n", slot_name(p_slot));
164 		event_type = INT_POWER_FAULT;
165 		/* set power fault status for this board */
166 		p_slot->status = 0xFF;
167 		ctrl_info(ctrl, "Power fault bit %x set\n", hp_slot);
168 	}
169 
170 	queue_interrupt_event(p_slot, event_type);
171 
172 	return 1;
173 }
174 
175 /* The following routines constitute the bulk of the
176    hotplug controller logic
177  */
change_bus_speed(struct controller * ctrl,struct slot * p_slot,enum pci_bus_speed speed)178 static int change_bus_speed(struct controller *ctrl, struct slot *p_slot,
179 		enum pci_bus_speed speed)
180 {
181 	int rc = 0;
182 
183 	ctrl_dbg(ctrl, "Change speed to %d\n", speed);
184 	rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, speed);
185 	if (rc) {
186 		ctrl_err(ctrl, "%s: Issue of set bus speed mode command failed\n",
187 			 __func__);
188 		return WRONG_BUS_FREQUENCY;
189 	}
190 	return rc;
191 }
192 
fix_bus_speed(struct controller * ctrl,struct slot * pslot,u8 flag,enum pci_bus_speed asp,enum pci_bus_speed bsp,enum pci_bus_speed msp)193 static int fix_bus_speed(struct controller *ctrl, struct slot *pslot,
194 		u8 flag, enum pci_bus_speed asp, enum pci_bus_speed bsp,
195 		enum pci_bus_speed msp)
196 {
197 	int rc = 0;
198 
199 	/*
200 	 * If other slots on the same bus are occupied, we cannot
201 	 * change the bus speed.
202 	 */
203 	if (flag) {
204 		if (asp < bsp) {
205 			ctrl_err(ctrl, "Speed of bus %x and adapter %x mismatch\n",
206 				 bsp, asp);
207 			rc = WRONG_BUS_FREQUENCY;
208 		}
209 		return rc;
210 	}
211 
212 	if (asp < msp) {
213 		if (bsp != asp)
214 			rc = change_bus_speed(ctrl, pslot, asp);
215 	} else {
216 		if (bsp != msp)
217 			rc = change_bus_speed(ctrl, pslot, msp);
218 	}
219 	return rc;
220 }
221 
222 /**
223  * board_added - Called after a board has been added to the system.
224  * @p_slot: target &slot
225  *
226  * Turns power on for the board.
227  * Configures board.
228  */
board_added(struct slot * p_slot)229 static int board_added(struct slot *p_slot)
230 {
231 	u8 hp_slot;
232 	u8 slots_not_empty = 0;
233 	int rc = 0;
234 	enum pci_bus_speed asp, bsp, msp;
235 	struct controller *ctrl = p_slot->ctrl;
236 	struct pci_bus *parent = ctrl->pci_dev->subordinate;
237 
238 	hp_slot = p_slot->device - ctrl->slot_device_offset;
239 
240 	ctrl_dbg(ctrl, "%s: p_slot->device, slot_offset, hp_slot = %d, %d ,%d\n",
241 		 __func__, p_slot->device, ctrl->slot_device_offset, hp_slot);
242 
243 	/* Power on slot without connecting to bus */
244 	rc = p_slot->hpc_ops->power_on_slot(p_slot);
245 	if (rc) {
246 		ctrl_err(ctrl, "Failed to power on slot\n");
247 		return -1;
248 	}
249 
250 	if ((ctrl->pci_dev->vendor == 0x8086) && (ctrl->pci_dev->device == 0x0332)) {
251 		rc = p_slot->hpc_ops->set_bus_speed_mode(p_slot, PCI_SPEED_33MHz);
252 		if (rc) {
253 			ctrl_err(ctrl, "%s: Issue of set bus speed mode command failed\n",
254 				 __func__);
255 			return WRONG_BUS_FREQUENCY;
256 		}
257 
258 		/* turn on board, blink green LED, turn off Amber LED */
259 		rc = p_slot->hpc_ops->slot_enable(p_slot);
260 		if (rc) {
261 			ctrl_err(ctrl, "Issue of Slot Enable command failed\n");
262 			return rc;
263 		}
264 	}
265 
266 	rc = p_slot->hpc_ops->get_adapter_speed(p_slot, &asp);
267 	if (rc) {
268 		ctrl_err(ctrl, "Can't get adapter speed or bus mode mismatch\n");
269 		return WRONG_BUS_FREQUENCY;
270 	}
271 
272 	bsp = ctrl->pci_dev->subordinate->cur_bus_speed;
273 	msp = ctrl->pci_dev->subordinate->max_bus_speed;
274 
275 	/* Check if there are other slots or devices on the same bus */
276 	if (!list_empty(&ctrl->pci_dev->subordinate->devices))
277 		slots_not_empty = 1;
278 
279 	ctrl_dbg(ctrl, "%s: slots_not_empty %d, adapter_speed %d, bus_speed %d, max_bus_speed %d\n",
280 		 __func__, slots_not_empty, asp,
281 		 bsp, msp);
282 
283 	rc = fix_bus_speed(ctrl, p_slot, slots_not_empty, asp, bsp, msp);
284 	if (rc)
285 		return rc;
286 
287 	/* turn on board, blink green LED, turn off Amber LED */
288 	rc = p_slot->hpc_ops->slot_enable(p_slot);
289 	if (rc) {
290 		ctrl_err(ctrl, "Issue of Slot Enable command failed\n");
291 		return rc;
292 	}
293 
294 	/* Wait for ~1 second */
295 	msleep(1000);
296 
297 	ctrl_dbg(ctrl, "%s: slot status = %x\n", __func__, p_slot->status);
298 	/* Check for a power fault */
299 	if (p_slot->status == 0xFF) {
300 		/* power fault occurred, but it was benign */
301 		ctrl_dbg(ctrl, "%s: Power fault\n", __func__);
302 		rc = POWER_FAILURE;
303 		p_slot->status = 0;
304 		goto err_exit;
305 	}
306 
307 	if (shpchp_configure_device(p_slot)) {
308 		ctrl_err(ctrl, "Cannot add device at %04x:%02x:%02x\n",
309 			 pci_domain_nr(parent), p_slot->bus, p_slot->device);
310 		goto err_exit;
311 	}
312 
313 	p_slot->status = 0;
314 	p_slot->is_a_board = 0x01;
315 	p_slot->pwr_save = 1;
316 
317 	p_slot->hpc_ops->green_led_on(p_slot);
318 
319 	return 0;
320 
321 err_exit:
322 	/* turn off slot, turn on Amber LED, turn off Green LED */
323 	rc = p_slot->hpc_ops->slot_disable(p_slot);
324 	if (rc) {
325 		ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n",
326 			 __func__);
327 		return rc;
328 	}
329 
330 	return(rc);
331 }
332 
333 
334 /**
335  * remove_board - Turns off slot and LEDs
336  * @p_slot: target &slot
337  */
remove_board(struct slot * p_slot)338 static int remove_board(struct slot *p_slot)
339 {
340 	struct controller *ctrl = p_slot->ctrl;
341 	u8 hp_slot;
342 	int rc;
343 
344 	if (shpchp_unconfigure_device(p_slot))
345 		return(1);
346 
347 	hp_slot = p_slot->device - ctrl->slot_device_offset;
348 	p_slot = shpchp_find_slot(ctrl, hp_slot + ctrl->slot_device_offset);
349 
350 	ctrl_dbg(ctrl, "%s: hp_slot = %d\n", __func__, hp_slot);
351 
352 	/* Change status to shutdown */
353 	if (p_slot->is_a_board)
354 		p_slot->status = 0x01;
355 
356 	/* turn off slot, turn on Amber LED, turn off Green LED */
357 	rc = p_slot->hpc_ops->slot_disable(p_slot);
358 	if (rc) {
359 		ctrl_err(ctrl, "%s: Issue of Slot Disable command failed\n",
360 			 __func__);
361 		return rc;
362 	}
363 
364 	rc = p_slot->hpc_ops->set_attention_status(p_slot, 0);
365 	if (rc) {
366 		ctrl_err(ctrl, "Issue of Set Attention command failed\n");
367 		return rc;
368 	}
369 
370 	p_slot->pwr_save = 0;
371 	p_slot->is_a_board = 0;
372 
373 	return 0;
374 }
375 
376 
377 struct pushbutton_work_info {
378 	struct slot *p_slot;
379 	struct work_struct work;
380 };
381 
382 /**
383  * shpchp_pushbutton_thread - handle pushbutton events
384  * @work: &struct work_struct to be handled
385  *
386  * Scheduled procedure to handle blocking stuff for the pushbuttons.
387  * Handles all pending events and exits.
388  */
shpchp_pushbutton_thread(struct work_struct * work)389 static void shpchp_pushbutton_thread(struct work_struct *work)
390 {
391 	struct pushbutton_work_info *info =
392 		container_of(work, struct pushbutton_work_info, work);
393 	struct slot *p_slot = info->p_slot;
394 
395 	mutex_lock(&p_slot->lock);
396 	switch (p_slot->state) {
397 	case POWEROFF_STATE:
398 		mutex_unlock(&p_slot->lock);
399 		shpchp_disable_slot(p_slot);
400 		mutex_lock(&p_slot->lock);
401 		p_slot->state = STATIC_STATE;
402 		break;
403 	case POWERON_STATE:
404 		mutex_unlock(&p_slot->lock);
405 		if (shpchp_enable_slot(p_slot))
406 			p_slot->hpc_ops->green_led_off(p_slot);
407 		mutex_lock(&p_slot->lock);
408 		p_slot->state = STATIC_STATE;
409 		break;
410 	default:
411 		break;
412 	}
413 	mutex_unlock(&p_slot->lock);
414 
415 	kfree(info);
416 }
417 
shpchp_queue_pushbutton_work(struct work_struct * work)418 void shpchp_queue_pushbutton_work(struct work_struct *work)
419 {
420 	struct slot *p_slot = container_of(work, struct slot, work.work);
421 	struct pushbutton_work_info *info;
422 
423 	info = kmalloc(sizeof(*info), GFP_KERNEL);
424 	if (!info) {
425 		ctrl_err(p_slot->ctrl, "%s: Cannot allocate memory\n",
426 			 __func__);
427 		return;
428 	}
429 	info->p_slot = p_slot;
430 	INIT_WORK(&info->work, shpchp_pushbutton_thread);
431 
432 	mutex_lock(&p_slot->lock);
433 	switch (p_slot->state) {
434 	case BLINKINGOFF_STATE:
435 		p_slot->state = POWEROFF_STATE;
436 		break;
437 	case BLINKINGON_STATE:
438 		p_slot->state = POWERON_STATE;
439 		break;
440 	default:
441 		kfree(info);
442 		goto out;
443 	}
444 	queue_work(p_slot->wq, &info->work);
445  out:
446 	mutex_unlock(&p_slot->lock);
447 }
448 
update_slot_info(struct slot * slot)449 static int update_slot_info (struct slot *slot)
450 {
451 	struct hotplug_slot_info *info;
452 	int result;
453 
454 	info = kmalloc(sizeof(*info), GFP_KERNEL);
455 	if (!info)
456 		return -ENOMEM;
457 
458 	slot->hpc_ops->get_power_status(slot, &(info->power_status));
459 	slot->hpc_ops->get_attention_status(slot, &(info->attention_status));
460 	slot->hpc_ops->get_latch_status(slot, &(info->latch_status));
461 	slot->hpc_ops->get_adapter_status(slot, &(info->adapter_status));
462 
463 	result = pci_hp_change_slot_info(slot->hotplug_slot, info);
464 	kfree (info);
465 	return result;
466 }
467 
468 /*
469  * Note: This function must be called with slot->lock held
470  */
handle_button_press_event(struct slot * p_slot)471 static void handle_button_press_event(struct slot *p_slot)
472 {
473 	u8 getstatus;
474 	struct controller *ctrl = p_slot->ctrl;
475 
476 	switch (p_slot->state) {
477 	case STATIC_STATE:
478 		p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
479 		if (getstatus) {
480 			p_slot->state = BLINKINGOFF_STATE;
481 			ctrl_info(ctrl, "PCI slot #%s - powering off due to button press\n",
482 				  slot_name(p_slot));
483 		} else {
484 			p_slot->state = BLINKINGON_STATE;
485 			ctrl_info(ctrl, "PCI slot #%s - powering on due to button press\n",
486 				  slot_name(p_slot));
487 		}
488 		/* blink green LED and turn off amber */
489 		p_slot->hpc_ops->green_led_blink(p_slot);
490 		p_slot->hpc_ops->set_attention_status(p_slot, 0);
491 
492 		queue_delayed_work(p_slot->wq, &p_slot->work, 5*HZ);
493 		break;
494 	case BLINKINGOFF_STATE:
495 	case BLINKINGON_STATE:
496 		/*
497 		 * Cancel if we are still blinking; this means that we
498 		 * press the attention again before the 5 sec. limit
499 		 * expires to cancel hot-add or hot-remove
500 		 */
501 		ctrl_info(ctrl, "Button cancel on Slot(%s)\n",
502 			  slot_name(p_slot));
503 		cancel_delayed_work(&p_slot->work);
504 		if (p_slot->state == BLINKINGOFF_STATE)
505 			p_slot->hpc_ops->green_led_on(p_slot);
506 		else
507 			p_slot->hpc_ops->green_led_off(p_slot);
508 		p_slot->hpc_ops->set_attention_status(p_slot, 0);
509 		ctrl_info(ctrl, "PCI slot #%s - action canceled due to button press\n",
510 			  slot_name(p_slot));
511 		p_slot->state = STATIC_STATE;
512 		break;
513 	case POWEROFF_STATE:
514 	case POWERON_STATE:
515 		/*
516 		 * Ignore if the slot is on power-on or power-off state;
517 		 * this means that the previous attention button action
518 		 * to hot-add or hot-remove is undergoing
519 		 */
520 		ctrl_info(ctrl, "Button ignore on Slot(%s)\n",
521 			  slot_name(p_slot));
522 		update_slot_info(p_slot);
523 		break;
524 	default:
525 		ctrl_warn(ctrl, "Not a valid state\n");
526 		break;
527 	}
528 }
529 
interrupt_event_handler(struct work_struct * work)530 static void interrupt_event_handler(struct work_struct *work)
531 {
532 	struct event_info *info = container_of(work, struct event_info, work);
533 	struct slot *p_slot = info->p_slot;
534 
535 	mutex_lock(&p_slot->lock);
536 	switch (info->event_type) {
537 	case INT_BUTTON_PRESS:
538 		handle_button_press_event(p_slot);
539 		break;
540 	case INT_POWER_FAULT:
541 		ctrl_dbg(p_slot->ctrl, "%s: Power fault\n", __func__);
542 		p_slot->hpc_ops->set_attention_status(p_slot, 1);
543 		p_slot->hpc_ops->green_led_off(p_slot);
544 		break;
545 	default:
546 		update_slot_info(p_slot);
547 		break;
548 	}
549 	mutex_unlock(&p_slot->lock);
550 
551 	kfree(info);
552 }
553 
554 
shpchp_enable_slot(struct slot * p_slot)555 static int shpchp_enable_slot (struct slot *p_slot)
556 {
557 	u8 getstatus = 0;
558 	int rc, retval = -ENODEV;
559 	struct controller *ctrl = p_slot->ctrl;
560 
561 	/* Check to see if (latch closed, card present, power off) */
562 	mutex_lock(&p_slot->ctrl->crit_sect);
563 	rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
564 	if (rc || !getstatus) {
565 		ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
566 		goto out;
567 	}
568 	rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
569 	if (rc || getstatus) {
570 		ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));
571 		goto out;
572 	}
573 	rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
574 	if (rc || getstatus) {
575 		ctrl_info(ctrl, "Already enabled on slot(%s)\n",
576 			  slot_name(p_slot));
577 		goto out;
578 	}
579 
580 	p_slot->is_a_board = 1;
581 
582 	/* We have to save the presence info for these slots */
583 	p_slot->hpc_ops->get_adapter_status(p_slot, &(p_slot->presence_save));
584 	p_slot->hpc_ops->get_power_status(p_slot, &(p_slot->pwr_save));
585 	ctrl_dbg(ctrl, "%s: p_slot->pwr_save %x\n", __func__, p_slot->pwr_save);
586 	p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
587 
588 	if ((p_slot->ctrl->pci_dev->vendor == PCI_VENDOR_ID_AMD &&
589 	     p_slot->ctrl->pci_dev->device == PCI_DEVICE_ID_AMD_POGO_7458)
590 	     && p_slot->ctrl->num_slots == 1) {
591 		/* handle AMD POGO errata; this must be done before enable  */
592 		amd_pogo_errata_save_misc_reg(p_slot);
593 		retval = board_added(p_slot);
594 		/* handle AMD POGO errata; this must be done after enable  */
595 		amd_pogo_errata_restore_misc_reg(p_slot);
596 	} else
597 		retval = board_added(p_slot);
598 
599 	if (retval) {
600 		p_slot->hpc_ops->get_adapter_status(p_slot,
601 				&(p_slot->presence_save));
602 		p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
603 	}
604 
605 	update_slot_info(p_slot);
606  out:
607 	mutex_unlock(&p_slot->ctrl->crit_sect);
608 	return retval;
609 }
610 
611 
shpchp_disable_slot(struct slot * p_slot)612 static int shpchp_disable_slot (struct slot *p_slot)
613 {
614 	u8 getstatus = 0;
615 	int rc, retval = -ENODEV;
616 	struct controller *ctrl = p_slot->ctrl;
617 
618 	if (!p_slot->ctrl)
619 		return -ENODEV;
620 
621 	/* Check to see if (latch closed, card present, power on) */
622 	mutex_lock(&p_slot->ctrl->crit_sect);
623 
624 	rc = p_slot->hpc_ops->get_adapter_status(p_slot, &getstatus);
625 	if (rc || !getstatus) {
626 		ctrl_info(ctrl, "No adapter on slot(%s)\n", slot_name(p_slot));
627 		goto out;
628 	}
629 	rc = p_slot->hpc_ops->get_latch_status(p_slot, &getstatus);
630 	if (rc || getstatus) {
631 		ctrl_info(ctrl, "Latch open on slot(%s)\n", slot_name(p_slot));
632 		goto out;
633 	}
634 	rc = p_slot->hpc_ops->get_power_status(p_slot, &getstatus);
635 	if (rc || !getstatus) {
636 		ctrl_info(ctrl, "Already disabled on slot(%s)\n",
637 			  slot_name(p_slot));
638 		goto out;
639 	}
640 
641 	retval = remove_board(p_slot);
642 	update_slot_info(p_slot);
643  out:
644 	mutex_unlock(&p_slot->ctrl->crit_sect);
645 	return retval;
646 }
647 
shpchp_sysfs_enable_slot(struct slot * p_slot)648 int shpchp_sysfs_enable_slot(struct slot *p_slot)
649 {
650 	int retval = -ENODEV;
651 	struct controller *ctrl = p_slot->ctrl;
652 
653 	mutex_lock(&p_slot->lock);
654 	switch (p_slot->state) {
655 	case BLINKINGON_STATE:
656 		cancel_delayed_work(&p_slot->work);
657 		/* fall through */
658 	case STATIC_STATE:
659 		p_slot->state = POWERON_STATE;
660 		mutex_unlock(&p_slot->lock);
661 		retval = shpchp_enable_slot(p_slot);
662 		mutex_lock(&p_slot->lock);
663 		p_slot->state = STATIC_STATE;
664 		break;
665 	case POWERON_STATE:
666 		ctrl_info(ctrl, "Slot %s is already in powering on state\n",
667 			  slot_name(p_slot));
668 		break;
669 	case BLINKINGOFF_STATE:
670 	case POWEROFF_STATE:
671 		ctrl_info(ctrl, "Already enabled on slot %s\n",
672 			  slot_name(p_slot));
673 		break;
674 	default:
675 		ctrl_err(ctrl, "Not a valid state on slot %s\n",
676 			 slot_name(p_slot));
677 		break;
678 	}
679 	mutex_unlock(&p_slot->lock);
680 
681 	return retval;
682 }
683 
shpchp_sysfs_disable_slot(struct slot * p_slot)684 int shpchp_sysfs_disable_slot(struct slot *p_slot)
685 {
686 	int retval = -ENODEV;
687 	struct controller *ctrl = p_slot->ctrl;
688 
689 	mutex_lock(&p_slot->lock);
690 	switch (p_slot->state) {
691 	case BLINKINGOFF_STATE:
692 		cancel_delayed_work(&p_slot->work);
693 		/* fall through */
694 	case STATIC_STATE:
695 		p_slot->state = POWEROFF_STATE;
696 		mutex_unlock(&p_slot->lock);
697 		retval = shpchp_disable_slot(p_slot);
698 		mutex_lock(&p_slot->lock);
699 		p_slot->state = STATIC_STATE;
700 		break;
701 	case POWEROFF_STATE:
702 		ctrl_info(ctrl, "Slot %s is already in powering off state\n",
703 			  slot_name(p_slot));
704 		break;
705 	case BLINKINGON_STATE:
706 	case POWERON_STATE:
707 		ctrl_info(ctrl, "Already disabled on slot %s\n",
708 			  slot_name(p_slot));
709 		break;
710 	default:
711 		ctrl_err(ctrl, "Not a valid state on slot %s\n",
712 			 slot_name(p_slot));
713 		break;
714 	}
715 	mutex_unlock(&p_slot->lock);
716 
717 	return retval;
718 }
719