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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
23#include "../pci.h"
24#include "pciehp.h"
25
26/* The following routines constitute the bulk of the
27 hotplug controller logic
28 */
29
30#define SAFE_REMOVAL true
31#define SURPRISE_REMOVAL false
32
33static void set_slot_off(struct controller *ctrl)
34{
35 /*
36 * Turn off slot, turn on attention indicator, turn off power
37 * indicator
38 */
39 if (POWER_CTRL(ctrl)) {
40 pciehp_power_off_slot(ctrl);
41
42 /*
43 * After turning power off, we must wait for at least 1 second
44 * before taking any action that relies on power having been
45 * removed from the slot/adapter.
46 */
47 msleep(1000);
48 }
49
50 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
51 PCI_EXP_SLTCTL_ATTN_IND_ON);
52}
53
54/**
55 * board_added - Called after a board has been added to the system.
56 * @ctrl: PCIe hotplug controller where board is added
57 *
58 * Turns power on for the board.
59 * Configures board.
60 */
61static int board_added(struct controller *ctrl)
62{
63 int retval = 0;
64 struct pci_bus *parent = ctrl->pcie->port->subordinate;
65
66 if (POWER_CTRL(ctrl)) {
67 /* Power on slot */
68 retval = pciehp_power_on_slot(ctrl);
69 if (retval)
70 return retval;
71 }
72
73 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK,
74 INDICATOR_NOOP);
75
76 /* Check link training status */
77 retval = pciehp_check_link_status(ctrl);
78 if (retval)
79 goto err_exit;
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 /* Don't carry LBMS indications across */
134 pcie_reset_lbms_count(ctrl->pcie->port);
135}
136
137static int pciehp_enable_slot(struct controller *ctrl);
138static int pciehp_disable_slot(struct controller *ctrl, bool safe_removal);
139
140void pciehp_request(struct controller *ctrl, int action)
141{
142 atomic_or(action, &ctrl->pending_events);
143 if (!pciehp_poll_mode)
144 irq_wake_thread(ctrl->pcie->irq, ctrl);
145}
146
147void pciehp_queue_pushbutton_work(struct work_struct *work)
148{
149 struct controller *ctrl = container_of(work, struct controller,
150 button_work.work);
151
152 mutex_lock(&ctrl->state_lock);
153 switch (ctrl->state) {
154 case BLINKINGOFF_STATE:
155 pciehp_request(ctrl, DISABLE_SLOT);
156 break;
157 case BLINKINGON_STATE:
158 pciehp_request(ctrl, PCI_EXP_SLTSTA_PDC);
159 break;
160 default:
161 break;
162 }
163 mutex_unlock(&ctrl->state_lock);
164}
165
166void pciehp_handle_button_press(struct controller *ctrl)
167{
168 mutex_lock(&ctrl->state_lock);
169 switch (ctrl->state) {
170 case OFF_STATE:
171 case ON_STATE:
172 if (ctrl->state == ON_STATE) {
173 ctrl->state = BLINKINGOFF_STATE;
174 ctrl_info(ctrl, "Slot(%s): Button press: will power off in 5 sec\n",
175 slot_name(ctrl));
176 } else {
177 ctrl->state = BLINKINGON_STATE;
178 ctrl_info(ctrl, "Slot(%s): Button press: will power on in 5 sec\n",
179 slot_name(ctrl));
180 }
181 /* blink power indicator and turn off attention */
182 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK,
183 PCI_EXP_SLTCTL_ATTN_IND_OFF);
184 schedule_delayed_work(&ctrl->button_work, 5 * HZ);
185 break;
186 case BLINKINGOFF_STATE:
187 case BLINKINGON_STATE:
188 /*
189 * Cancel if we are still blinking; this means that we
190 * press the attention again before the 5 sec. limit
191 * expires to cancel hot-add or hot-remove
192 */
193 cancel_delayed_work(&ctrl->button_work);
194 if (ctrl->state == BLINKINGOFF_STATE) {
195 ctrl->state = ON_STATE;
196 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON,
197 PCI_EXP_SLTCTL_ATTN_IND_OFF);
198 ctrl_info(ctrl, "Slot(%s): Button press: canceling request to power off\n",
199 slot_name(ctrl));
200 } else {
201 ctrl->state = OFF_STATE;
202 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
203 PCI_EXP_SLTCTL_ATTN_IND_OFF);
204 ctrl_info(ctrl, "Slot(%s): Button press: canceling request to power on\n",
205 slot_name(ctrl));
206 }
207 break;
208 default:
209 ctrl_err(ctrl, "Slot(%s): Button press: ignoring invalid state %#x\n",
210 slot_name(ctrl), ctrl->state);
211 break;
212 }
213 mutex_unlock(&ctrl->state_lock);
214}
215
216void pciehp_handle_disable_request(struct controller *ctrl)
217{
218 mutex_lock(&ctrl->state_lock);
219 switch (ctrl->state) {
220 case BLINKINGON_STATE:
221 case BLINKINGOFF_STATE:
222 cancel_delayed_work(&ctrl->button_work);
223 break;
224 }
225 ctrl->state = POWEROFF_STATE;
226 mutex_unlock(&ctrl->state_lock);
227
228 ctrl->request_result = pciehp_disable_slot(ctrl, SAFE_REMOVAL);
229}
230
231void pciehp_handle_presence_or_link_change(struct controller *ctrl, u32 events)
232{
233 int present, link_active;
234
235 /*
236 * If the slot is on and presence or link has changed, turn it off.
237 * Even if it's occupied again, we cannot assume the card is the same.
238 */
239 mutex_lock(&ctrl->state_lock);
240 switch (ctrl->state) {
241 case BLINKINGOFF_STATE:
242 cancel_delayed_work(&ctrl->button_work);
243 fallthrough;
244 case ON_STATE:
245 ctrl->state = POWEROFF_STATE;
246 mutex_unlock(&ctrl->state_lock);
247 if (events & PCI_EXP_SLTSTA_DLLSC)
248 ctrl_info(ctrl, "Slot(%s): Link Down\n",
249 slot_name(ctrl));
250 if (events & PCI_EXP_SLTSTA_PDC)
251 ctrl_info(ctrl, "Slot(%s): Card not present\n",
252 slot_name(ctrl));
253 pciehp_disable_slot(ctrl, SURPRISE_REMOVAL);
254 break;
255 default:
256 mutex_unlock(&ctrl->state_lock);
257 break;
258 }
259
260 /* Turn the slot on if it's occupied or link is up */
261 mutex_lock(&ctrl->state_lock);
262 present = pciehp_card_present(ctrl);
263 link_active = pciehp_check_link_active(ctrl);
264 if (present <= 0 && link_active <= 0) {
265 if (ctrl->state == BLINKINGON_STATE) {
266 ctrl->state = OFF_STATE;
267 cancel_delayed_work(&ctrl->button_work);
268 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
269 INDICATOR_NOOP);
270 ctrl_info(ctrl, "Slot(%s): Card not present\n",
271 slot_name(ctrl));
272 }
273 mutex_unlock(&ctrl->state_lock);
274 return;
275 }
276
277 switch (ctrl->state) {
278 case BLINKINGON_STATE:
279 cancel_delayed_work(&ctrl->button_work);
280 fallthrough;
281 case OFF_STATE:
282 ctrl->state = POWERON_STATE;
283 mutex_unlock(&ctrl->state_lock);
284 if (present)
285 ctrl_info(ctrl, "Slot(%s): Card present\n",
286 slot_name(ctrl));
287 if (link_active)
288 ctrl_info(ctrl, "Slot(%s): Link Up\n",
289 slot_name(ctrl));
290 ctrl->request_result = pciehp_enable_slot(ctrl);
291 break;
292 default:
293 mutex_unlock(&ctrl->state_lock);
294 break;
295 }
296}
297
298static int __pciehp_enable_slot(struct controller *ctrl)
299{
300 u8 getstatus = 0;
301
302 if (MRL_SENS(ctrl)) {
303 pciehp_get_latch_status(ctrl, &getstatus);
304 if (getstatus) {
305 ctrl_info(ctrl, "Slot(%s): Latch open\n",
306 slot_name(ctrl));
307 return -ENODEV;
308 }
309 }
310
311 if (POWER_CTRL(ctrl)) {
312 pciehp_get_power_status(ctrl, &getstatus);
313 if (getstatus) {
314 ctrl_info(ctrl, "Slot(%s): Already enabled\n",
315 slot_name(ctrl));
316 return 0;
317 }
318 }
319
320 return board_added(ctrl);
321}
322
323static int pciehp_enable_slot(struct controller *ctrl)
324{
325 int ret;
326
327 pm_runtime_get_sync(&ctrl->pcie->port->dev);
328 ret = __pciehp_enable_slot(ctrl);
329 if (ret && ATTN_BUTTN(ctrl))
330 /* may be blinking */
331 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
332 INDICATOR_NOOP);
333 pm_runtime_put(&ctrl->pcie->port->dev);
334
335 mutex_lock(&ctrl->state_lock);
336 ctrl->state = ret ? OFF_STATE : ON_STATE;
337 mutex_unlock(&ctrl->state_lock);
338
339 return ret;
340}
341
342static int __pciehp_disable_slot(struct controller *ctrl, bool safe_removal)
343{
344 u8 getstatus = 0;
345
346 if (POWER_CTRL(ctrl)) {
347 pciehp_get_power_status(ctrl, &getstatus);
348 if (!getstatus) {
349 ctrl_info(ctrl, "Slot(%s): Already disabled\n",
350 slot_name(ctrl));
351 return -EINVAL;
352 }
353 }
354
355 remove_board(ctrl, safe_removal);
356 return 0;
357}
358
359static int pciehp_disable_slot(struct controller *ctrl, bool safe_removal)
360{
361 int ret;
362
363 pm_runtime_get_sync(&ctrl->pcie->port->dev);
364 ret = __pciehp_disable_slot(ctrl, safe_removal);
365 pm_runtime_put(&ctrl->pcie->port->dev);
366
367 mutex_lock(&ctrl->state_lock);
368 ctrl->state = OFF_STATE;
369 mutex_unlock(&ctrl->state_lock);
370
371 return ret;
372}
373
374int pciehp_sysfs_enable_slot(struct hotplug_slot *hotplug_slot)
375{
376 struct controller *ctrl = to_ctrl(hotplug_slot);
377
378 mutex_lock(&ctrl->state_lock);
379 switch (ctrl->state) {
380 case BLINKINGON_STATE:
381 case OFF_STATE:
382 mutex_unlock(&ctrl->state_lock);
383 /*
384 * The IRQ thread becomes a no-op if the user pulls out the
385 * card before the thread wakes up, so initialize to -ENODEV.
386 */
387 ctrl->request_result = -ENODEV;
388 pciehp_request(ctrl, PCI_EXP_SLTSTA_PDC);
389 wait_event(ctrl->requester,
390 !atomic_read(&ctrl->pending_events) &&
391 !ctrl->ist_running);
392 return ctrl->request_result;
393 case POWERON_STATE:
394 ctrl_info(ctrl, "Slot(%s): Already in powering on state\n",
395 slot_name(ctrl));
396 break;
397 case BLINKINGOFF_STATE:
398 case ON_STATE:
399 case POWEROFF_STATE:
400 ctrl_info(ctrl, "Slot(%s): Already enabled\n",
401 slot_name(ctrl));
402 break;
403 default:
404 ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
405 slot_name(ctrl), ctrl->state);
406 break;
407 }
408 mutex_unlock(&ctrl->state_lock);
409
410 return -ENODEV;
411}
412
413int pciehp_sysfs_disable_slot(struct hotplug_slot *hotplug_slot)
414{
415 struct controller *ctrl = to_ctrl(hotplug_slot);
416
417 mutex_lock(&ctrl->state_lock);
418 switch (ctrl->state) {
419 case BLINKINGOFF_STATE:
420 case ON_STATE:
421 mutex_unlock(&ctrl->state_lock);
422 pciehp_request(ctrl, DISABLE_SLOT);
423 wait_event(ctrl->requester,
424 !atomic_read(&ctrl->pending_events) &&
425 !ctrl->ist_running);
426 return ctrl->request_result;
427 case POWEROFF_STATE:
428 ctrl_info(ctrl, "Slot(%s): Already in powering off state\n",
429 slot_name(ctrl));
430 break;
431 case BLINKINGON_STATE:
432 case OFF_STATE:
433 case POWERON_STATE:
434 ctrl_info(ctrl, "Slot(%s): Already disabled\n",
435 slot_name(ctrl));
436 break;
437 default:
438 ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
439 slot_name(ctrl), ctrl->state);
440 break;
441 }
442 mutex_unlock(&ctrl->state_lock);
443
444 return -ENODEV;
445}
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 goto err_exit;
78
79 /* Check for a power fault */
80 if (ctrl->power_fault_detected || pciehp_query_power_fault(ctrl)) {
81 ctrl_err(ctrl, "Slot(%s): Power fault\n", slot_name(ctrl));
82 retval = -EIO;
83 goto err_exit;
84 }
85
86 retval = pciehp_configure_device(ctrl);
87 if (retval) {
88 if (retval != -EEXIST) {
89 ctrl_err(ctrl, "Cannot add device at %04x:%02x:00\n",
90 pci_domain_nr(parent), parent->number);
91 goto err_exit;
92 }
93 }
94
95 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON,
96 PCI_EXP_SLTCTL_ATTN_IND_OFF);
97 return 0;
98
99err_exit:
100 set_slot_off(ctrl);
101 return retval;
102}
103
104/**
105 * remove_board - Turn off slot and Power Indicator
106 * @ctrl: PCIe hotplug controller where board is being removed
107 * @safe_removal: whether the board is safely removed (versus surprise removed)
108 */
109static void remove_board(struct controller *ctrl, bool safe_removal)
110{
111 pciehp_unconfigure_device(ctrl, safe_removal);
112
113 if (POWER_CTRL(ctrl)) {
114 pciehp_power_off_slot(ctrl);
115
116 /*
117 * After turning power off, we must wait for at least 1 second
118 * before taking any action that relies on power having been
119 * removed from the slot/adapter.
120 */
121 msleep(1000);
122
123 /* Ignore link or presence changes caused by power off */
124 atomic_and(~(PCI_EXP_SLTSTA_DLLSC | PCI_EXP_SLTSTA_PDC),
125 &ctrl->pending_events);
126 }
127
128 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
129 INDICATOR_NOOP);
130}
131
132static int pciehp_enable_slot(struct controller *ctrl);
133static int pciehp_disable_slot(struct controller *ctrl, bool safe_removal);
134
135void pciehp_request(struct controller *ctrl, int action)
136{
137 atomic_or(action, &ctrl->pending_events);
138 if (!pciehp_poll_mode)
139 irq_wake_thread(ctrl->pcie->irq, ctrl);
140}
141
142void pciehp_queue_pushbutton_work(struct work_struct *work)
143{
144 struct controller *ctrl = container_of(work, struct controller,
145 button_work.work);
146
147 mutex_lock(&ctrl->state_lock);
148 switch (ctrl->state) {
149 case BLINKINGOFF_STATE:
150 pciehp_request(ctrl, DISABLE_SLOT);
151 break;
152 case BLINKINGON_STATE:
153 pciehp_request(ctrl, PCI_EXP_SLTSTA_PDC);
154 break;
155 default:
156 break;
157 }
158 mutex_unlock(&ctrl->state_lock);
159}
160
161void pciehp_handle_button_press(struct controller *ctrl)
162{
163 mutex_lock(&ctrl->state_lock);
164 switch (ctrl->state) {
165 case OFF_STATE:
166 case ON_STATE:
167 if (ctrl->state == ON_STATE) {
168 ctrl->state = BLINKINGOFF_STATE;
169 ctrl_info(ctrl, "Slot(%s): Powering off due to button press\n",
170 slot_name(ctrl));
171 } else {
172 ctrl->state = BLINKINGON_STATE;
173 ctrl_info(ctrl, "Slot(%s) Powering on due to button press\n",
174 slot_name(ctrl));
175 }
176 /* blink power indicator and turn off attention */
177 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_BLINK,
178 PCI_EXP_SLTCTL_ATTN_IND_OFF);
179 schedule_delayed_work(&ctrl->button_work, 5 * HZ);
180 break;
181 case BLINKINGOFF_STATE:
182 case BLINKINGON_STATE:
183 /*
184 * Cancel if we are still blinking; this means that we
185 * press the attention again before the 5 sec. limit
186 * expires to cancel hot-add or hot-remove
187 */
188 ctrl_info(ctrl, "Slot(%s): Button cancel\n", slot_name(ctrl));
189 cancel_delayed_work(&ctrl->button_work);
190 if (ctrl->state == BLINKINGOFF_STATE) {
191 ctrl->state = ON_STATE;
192 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_ON,
193 PCI_EXP_SLTCTL_ATTN_IND_OFF);
194 } else {
195 ctrl->state = OFF_STATE;
196 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
197 PCI_EXP_SLTCTL_ATTN_IND_OFF);
198 }
199 ctrl_info(ctrl, "Slot(%s): Action canceled due to button press\n",
200 slot_name(ctrl));
201 break;
202 default:
203 ctrl_err(ctrl, "Slot(%s): Ignoring invalid state %#x\n",
204 slot_name(ctrl), ctrl->state);
205 break;
206 }
207 mutex_unlock(&ctrl->state_lock);
208}
209
210void pciehp_handle_disable_request(struct controller *ctrl)
211{
212 mutex_lock(&ctrl->state_lock);
213 switch (ctrl->state) {
214 case BLINKINGON_STATE:
215 case BLINKINGOFF_STATE:
216 cancel_delayed_work(&ctrl->button_work);
217 break;
218 }
219 ctrl->state = POWEROFF_STATE;
220 mutex_unlock(&ctrl->state_lock);
221
222 ctrl->request_result = pciehp_disable_slot(ctrl, SAFE_REMOVAL);
223}
224
225void pciehp_handle_presence_or_link_change(struct controller *ctrl, u32 events)
226{
227 int present, link_active;
228
229 /*
230 * If the slot is on and presence or link has changed, turn it off.
231 * Even if it's occupied again, we cannot assume the card is the same.
232 */
233 mutex_lock(&ctrl->state_lock);
234 switch (ctrl->state) {
235 case BLINKINGOFF_STATE:
236 cancel_delayed_work(&ctrl->button_work);
237 fallthrough;
238 case ON_STATE:
239 ctrl->state = POWEROFF_STATE;
240 mutex_unlock(&ctrl->state_lock);
241 if (events & PCI_EXP_SLTSTA_DLLSC)
242 ctrl_info(ctrl, "Slot(%s): Link Down\n",
243 slot_name(ctrl));
244 if (events & PCI_EXP_SLTSTA_PDC)
245 ctrl_info(ctrl, "Slot(%s): Card not present\n",
246 slot_name(ctrl));
247 pciehp_disable_slot(ctrl, SURPRISE_REMOVAL);
248 break;
249 default:
250 mutex_unlock(&ctrl->state_lock);
251 break;
252 }
253
254 /* Turn the slot on if it's occupied or link is up */
255 mutex_lock(&ctrl->state_lock);
256 present = pciehp_card_present(ctrl);
257 link_active = pciehp_check_link_active(ctrl);
258 if (present <= 0 && link_active <= 0) {
259 mutex_unlock(&ctrl->state_lock);
260 return;
261 }
262
263 switch (ctrl->state) {
264 case BLINKINGON_STATE:
265 cancel_delayed_work(&ctrl->button_work);
266 fallthrough;
267 case OFF_STATE:
268 ctrl->state = POWERON_STATE;
269 mutex_unlock(&ctrl->state_lock);
270 if (present)
271 ctrl_info(ctrl, "Slot(%s): Card present\n",
272 slot_name(ctrl));
273 if (link_active)
274 ctrl_info(ctrl, "Slot(%s): Link Up\n",
275 slot_name(ctrl));
276 ctrl->request_result = pciehp_enable_slot(ctrl);
277 break;
278 default:
279 mutex_unlock(&ctrl->state_lock);
280 break;
281 }
282}
283
284static int __pciehp_enable_slot(struct controller *ctrl)
285{
286 u8 getstatus = 0;
287
288 if (MRL_SENS(ctrl)) {
289 pciehp_get_latch_status(ctrl, &getstatus);
290 if (getstatus) {
291 ctrl_info(ctrl, "Slot(%s): Latch open\n",
292 slot_name(ctrl));
293 return -ENODEV;
294 }
295 }
296
297 if (POWER_CTRL(ctrl)) {
298 pciehp_get_power_status(ctrl, &getstatus);
299 if (getstatus) {
300 ctrl_info(ctrl, "Slot(%s): Already enabled\n",
301 slot_name(ctrl));
302 return 0;
303 }
304 }
305
306 return board_added(ctrl);
307}
308
309static int pciehp_enable_slot(struct controller *ctrl)
310{
311 int ret;
312
313 pm_runtime_get_sync(&ctrl->pcie->port->dev);
314 ret = __pciehp_enable_slot(ctrl);
315 if (ret && ATTN_BUTTN(ctrl))
316 /* may be blinking */
317 pciehp_set_indicators(ctrl, PCI_EXP_SLTCTL_PWR_IND_OFF,
318 INDICATOR_NOOP);
319 pm_runtime_put(&ctrl->pcie->port->dev);
320
321 mutex_lock(&ctrl->state_lock);
322 ctrl->state = ret ? OFF_STATE : ON_STATE;
323 mutex_unlock(&ctrl->state_lock);
324
325 return ret;
326}
327
328static int __pciehp_disable_slot(struct controller *ctrl, bool safe_removal)
329{
330 u8 getstatus = 0;
331
332 if (POWER_CTRL(ctrl)) {
333 pciehp_get_power_status(ctrl, &getstatus);
334 if (!getstatus) {
335 ctrl_info(ctrl, "Slot(%s): Already disabled\n",
336 slot_name(ctrl));
337 return -EINVAL;
338 }
339 }
340
341 remove_board(ctrl, safe_removal);
342 return 0;
343}
344
345static int pciehp_disable_slot(struct controller *ctrl, bool safe_removal)
346{
347 int ret;
348
349 pm_runtime_get_sync(&ctrl->pcie->port->dev);
350 ret = __pciehp_disable_slot(ctrl, safe_removal);
351 pm_runtime_put(&ctrl->pcie->port->dev);
352
353 mutex_lock(&ctrl->state_lock);
354 ctrl->state = OFF_STATE;
355 mutex_unlock(&ctrl->state_lock);
356
357 return ret;
358}
359
360int pciehp_sysfs_enable_slot(struct hotplug_slot *hotplug_slot)
361{
362 struct controller *ctrl = to_ctrl(hotplug_slot);
363
364 mutex_lock(&ctrl->state_lock);
365 switch (ctrl->state) {
366 case BLINKINGON_STATE:
367 case OFF_STATE:
368 mutex_unlock(&ctrl->state_lock);
369 /*
370 * The IRQ thread becomes a no-op if the user pulls out the
371 * card before the thread wakes up, so initialize to -ENODEV.
372 */
373 ctrl->request_result = -ENODEV;
374 pciehp_request(ctrl, PCI_EXP_SLTSTA_PDC);
375 wait_event(ctrl->requester,
376 !atomic_read(&ctrl->pending_events) &&
377 !ctrl->ist_running);
378 return ctrl->request_result;
379 case POWERON_STATE:
380 ctrl_info(ctrl, "Slot(%s): Already in powering on state\n",
381 slot_name(ctrl));
382 break;
383 case BLINKINGOFF_STATE:
384 case ON_STATE:
385 case POWEROFF_STATE:
386 ctrl_info(ctrl, "Slot(%s): Already enabled\n",
387 slot_name(ctrl));
388 break;
389 default:
390 ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
391 slot_name(ctrl), ctrl->state);
392 break;
393 }
394 mutex_unlock(&ctrl->state_lock);
395
396 return -ENODEV;
397}
398
399int pciehp_sysfs_disable_slot(struct hotplug_slot *hotplug_slot)
400{
401 struct controller *ctrl = to_ctrl(hotplug_slot);
402
403 mutex_lock(&ctrl->state_lock);
404 switch (ctrl->state) {
405 case BLINKINGOFF_STATE:
406 case ON_STATE:
407 mutex_unlock(&ctrl->state_lock);
408 pciehp_request(ctrl, DISABLE_SLOT);
409 wait_event(ctrl->requester,
410 !atomic_read(&ctrl->pending_events) &&
411 !ctrl->ist_running);
412 return ctrl->request_result;
413 case POWEROFF_STATE:
414 ctrl_info(ctrl, "Slot(%s): Already in powering off state\n",
415 slot_name(ctrl));
416 break;
417 case BLINKINGON_STATE:
418 case OFF_STATE:
419 case POWERON_STATE:
420 ctrl_info(ctrl, "Slot(%s): Already disabled\n",
421 slot_name(ctrl));
422 break;
423 default:
424 ctrl_err(ctrl, "Slot(%s): Invalid state %#x\n",
425 slot_name(ctrl), ctrl->state);
426 break;
427 }
428 mutex_unlock(&ctrl->state_lock);
429
430 return -ENODEV;
431}