1 /*
2  * Copyright 2012 Advanced Micro Devices, Inc.
3  *
4  * Permission is hereby granted, free of charge, to any person obtaining a
5  * copy of this software and associated documentation files (the "Software"),
6  * to deal in the Software without restriction, including without limitation
7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
8  * and/or sell copies of the Software, and to permit persons to whom the
9  * Software is furnished to do so, subject to the following conditions:
10  *
11  * The above copyright notice and this permission notice shall be included in
12  * all copies or substantial portions of the Software.
13  *
14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
20  * OTHER DEALINGS IN THE SOFTWARE.
21  *
22  */
23 
24 #include <linux/pci.h>
25 #include <linux/acpi.h>
26 #include <linux/slab.h>
27 #include <linux/power_supply.h>
28 #include <linux/pm_runtime.h>
29 #include <linux/suspend.h>
30 #include <acpi/video.h>
31 #include <acpi/actbl.h>
32 
33 #include <drm/drm_crtc_helper.h>
34 #include "amdgpu.h"
35 #include "amdgpu_pm.h"
36 #include "amdgpu_display.h"
37 #include "amd_acpi.h"
38 #include "atom.h"
39 
40 struct amdgpu_atif_notification_cfg {
41 	bool enabled;
42 	int command_code;
43 };
44 
45 struct amdgpu_atif_notifications {
46 	bool thermal_state;
47 	bool forced_power_state;
48 	bool system_power_state;
49 	bool brightness_change;
50 	bool dgpu_display_event;
51 	bool gpu_package_power_limit;
52 };
53 
54 struct amdgpu_atif_functions {
55 	bool system_params;
56 	bool sbios_requests;
57 	bool temperature_change;
58 	bool query_backlight_transfer_characteristics;
59 	bool ready_to_undock;
60 	bool external_gpu_information;
61 };
62 
63 struct amdgpu_atif {
64 	acpi_handle handle;
65 
66 	struct amdgpu_atif_notifications notifications;
67 	struct amdgpu_atif_functions functions;
68 	struct amdgpu_atif_notification_cfg notification_cfg;
69 	struct backlight_device *bd;
70 	struct amdgpu_dm_backlight_caps backlight_caps;
71 };
72 
73 struct amdgpu_atcs_functions {
74 	bool get_ext_state;
75 	bool pcie_perf_req;
76 	bool pcie_dev_rdy;
77 	bool pcie_bus_width;
78 	bool power_shift_control;
79 };
80 
81 struct amdgpu_atcs {
82 	acpi_handle handle;
83 
84 	struct amdgpu_atcs_functions functions;
85 };
86 
87 static struct amdgpu_acpi_priv {
88 	struct amdgpu_atif atif;
89 	struct amdgpu_atcs atcs;
90 } amdgpu_acpi_priv;
91 
92 /* Call the ATIF method
93  */
94 /**
95  * amdgpu_atif_call - call an ATIF method
96  *
97  * @atif: atif structure
98  * @function: the ATIF function to execute
99  * @params: ATIF function params
100  *
101  * Executes the requested ATIF function (all asics).
102  * Returns a pointer to the acpi output buffer.
103  */
104 static union acpi_object *amdgpu_atif_call(struct amdgpu_atif *atif,
105 					   int function,
106 					   struct acpi_buffer *params)
107 {
108 	acpi_status status;
109 	union acpi_object atif_arg_elements[2];
110 	struct acpi_object_list atif_arg;
111 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
112 
113 	atif_arg.count = 2;
114 	atif_arg.pointer = &atif_arg_elements[0];
115 
116 	atif_arg_elements[0].type = ACPI_TYPE_INTEGER;
117 	atif_arg_elements[0].integer.value = function;
118 
119 	if (params) {
120 		atif_arg_elements[1].type = ACPI_TYPE_BUFFER;
121 		atif_arg_elements[1].buffer.length = params->length;
122 		atif_arg_elements[1].buffer.pointer = params->pointer;
123 	} else {
124 		/* We need a second fake parameter */
125 		atif_arg_elements[1].type = ACPI_TYPE_INTEGER;
126 		atif_arg_elements[1].integer.value = 0;
127 	}
128 
129 	status = acpi_evaluate_object(atif->handle, NULL, &atif_arg,
130 				      &buffer);
131 
132 	/* Fail only if calling the method fails and ATIF is supported */
133 	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
134 		DRM_DEBUG_DRIVER("failed to evaluate ATIF got %s\n",
135 				 acpi_format_exception(status));
136 		kfree(buffer.pointer);
137 		return NULL;
138 	}
139 
140 	return buffer.pointer;
141 }
142 
143 /**
144  * amdgpu_atif_parse_notification - parse supported notifications
145  *
146  * @n: supported notifications struct
147  * @mask: supported notifications mask from ATIF
148  *
149  * Use the supported notifications mask from ATIF function
150  * ATIF_FUNCTION_VERIFY_INTERFACE to determine what notifications
151  * are supported (all asics).
152  */
153 static void amdgpu_atif_parse_notification(struct amdgpu_atif_notifications *n, u32 mask)
154 {
155 	n->thermal_state = mask & ATIF_THERMAL_STATE_CHANGE_REQUEST_SUPPORTED;
156 	n->forced_power_state = mask & ATIF_FORCED_POWER_STATE_CHANGE_REQUEST_SUPPORTED;
157 	n->system_power_state = mask & ATIF_SYSTEM_POWER_SOURCE_CHANGE_REQUEST_SUPPORTED;
158 	n->brightness_change = mask & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST_SUPPORTED;
159 	n->dgpu_display_event = mask & ATIF_DGPU_DISPLAY_EVENT_SUPPORTED;
160 	n->gpu_package_power_limit = mask & ATIF_GPU_PACKAGE_POWER_LIMIT_REQUEST_SUPPORTED;
161 }
162 
163 /**
164  * amdgpu_atif_parse_functions - parse supported functions
165  *
166  * @f: supported functions struct
167  * @mask: supported functions mask from ATIF
168  *
169  * Use the supported functions mask from ATIF function
170  * ATIF_FUNCTION_VERIFY_INTERFACE to determine what functions
171  * are supported (all asics).
172  */
173 static void amdgpu_atif_parse_functions(struct amdgpu_atif_functions *f, u32 mask)
174 {
175 	f->system_params = mask & ATIF_GET_SYSTEM_PARAMETERS_SUPPORTED;
176 	f->sbios_requests = mask & ATIF_GET_SYSTEM_BIOS_REQUESTS_SUPPORTED;
177 	f->temperature_change = mask & ATIF_TEMPERATURE_CHANGE_NOTIFICATION_SUPPORTED;
178 	f->query_backlight_transfer_characteristics =
179 		mask & ATIF_QUERY_BACKLIGHT_TRANSFER_CHARACTERISTICS_SUPPORTED;
180 	f->ready_to_undock = mask & ATIF_READY_TO_UNDOCK_NOTIFICATION_SUPPORTED;
181 	f->external_gpu_information = mask & ATIF_GET_EXTERNAL_GPU_INFORMATION_SUPPORTED;
182 }
183 
184 /**
185  * amdgpu_atif_verify_interface - verify ATIF
186  *
187  * @atif: amdgpu atif struct
188  *
189  * Execute the ATIF_FUNCTION_VERIFY_INTERFACE ATIF function
190  * to initialize ATIF and determine what features are supported
191  * (all asics).
192  * returns 0 on success, error on failure.
193  */
194 static int amdgpu_atif_verify_interface(struct amdgpu_atif *atif)
195 {
196 	union acpi_object *info;
197 	struct atif_verify_interface output;
198 	size_t size;
199 	int err = 0;
200 
201 	info = amdgpu_atif_call(atif, ATIF_FUNCTION_VERIFY_INTERFACE, NULL);
202 	if (!info)
203 		return -EIO;
204 
205 	memset(&output, 0, sizeof(output));
206 
207 	size = *(u16 *) info->buffer.pointer;
208 	if (size < 12) {
209 		DRM_INFO("ATIF buffer is too small: %zu\n", size);
210 		err = -EINVAL;
211 		goto out;
212 	}
213 	size = min(sizeof(output), size);
214 
215 	memcpy(&output, info->buffer.pointer, size);
216 
217 	/* TODO: check version? */
218 	DRM_DEBUG_DRIVER("ATIF version %u\n", output.version);
219 
220 	amdgpu_atif_parse_notification(&atif->notifications, output.notification_mask);
221 	amdgpu_atif_parse_functions(&atif->functions, output.function_bits);
222 
223 out:
224 	kfree(info);
225 	return err;
226 }
227 
228 /**
229  * amdgpu_atif_get_notification_params - determine notify configuration
230  *
231  * @atif: acpi handle
232  *
233  * Execute the ATIF_FUNCTION_GET_SYSTEM_PARAMETERS ATIF function
234  * to determine if a notifier is used and if so which one
235  * (all asics).  This is either Notify(VGA, 0x81) or Notify(VGA, n)
236  * where n is specified in the result if a notifier is used.
237  * Returns 0 on success, error on failure.
238  */
239 static int amdgpu_atif_get_notification_params(struct amdgpu_atif *atif)
240 {
241 	union acpi_object *info;
242 	struct amdgpu_atif_notification_cfg *n = &atif->notification_cfg;
243 	struct atif_system_params params;
244 	size_t size;
245 	int err = 0;
246 
247 	info = amdgpu_atif_call(atif, ATIF_FUNCTION_GET_SYSTEM_PARAMETERS,
248 				NULL);
249 	if (!info) {
250 		err = -EIO;
251 		goto out;
252 	}
253 
254 	size = *(u16 *) info->buffer.pointer;
255 	if (size < 10) {
256 		err = -EINVAL;
257 		goto out;
258 	}
259 
260 	memset(&params, 0, sizeof(params));
261 	size = min(sizeof(params), size);
262 	memcpy(&params, info->buffer.pointer, size);
263 
264 	DRM_DEBUG_DRIVER("SYSTEM_PARAMS: mask = %#x, flags = %#x\n",
265 			params.flags, params.valid_mask);
266 	params.flags = params.flags & params.valid_mask;
267 
268 	if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_NONE) {
269 		n->enabled = false;
270 		n->command_code = 0;
271 	} else if ((params.flags & ATIF_NOTIFY_MASK) == ATIF_NOTIFY_81) {
272 		n->enabled = true;
273 		n->command_code = 0x81;
274 	} else {
275 		if (size < 11) {
276 			err = -EINVAL;
277 			goto out;
278 		}
279 		n->enabled = true;
280 		n->command_code = params.command_code;
281 	}
282 
283 out:
284 	DRM_DEBUG_DRIVER("Notification %s, command code = %#x\n",
285 			(n->enabled ? "enabled" : "disabled"),
286 			n->command_code);
287 	kfree(info);
288 	return err;
289 }
290 
291 /**
292  * amdgpu_atif_query_backlight_caps - get min and max backlight input signal
293  *
294  * @atif: acpi handle
295  *
296  * Execute the QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS ATIF function
297  * to determine the acceptable range of backlight values
298  *
299  * Backlight_caps.caps_valid will be set to true if the query is successful
300  *
301  * The input signals are in range 0-255
302  *
303  * This function assumes the display with backlight is the first LCD
304  *
305  * Returns 0 on success, error on failure.
306  */
307 static int amdgpu_atif_query_backlight_caps(struct amdgpu_atif *atif)
308 {
309 	union acpi_object *info;
310 	struct atif_qbtc_output characteristics;
311 	struct atif_qbtc_arguments arguments;
312 	struct acpi_buffer params;
313 	size_t size;
314 	int err = 0;
315 
316 	arguments.size = sizeof(arguments);
317 	arguments.requested_display = ATIF_QBTC_REQUEST_LCD1;
318 
319 	params.length = sizeof(arguments);
320 	params.pointer = (void *)&arguments;
321 
322 	info = amdgpu_atif_call(atif,
323 		ATIF_FUNCTION_QUERY_BRIGHTNESS_TRANSFER_CHARACTERISTICS,
324 		&params);
325 	if (!info) {
326 		err = -EIO;
327 		goto out;
328 	}
329 
330 	size = *(u16 *) info->buffer.pointer;
331 	if (size < 10) {
332 		err = -EINVAL;
333 		goto out;
334 	}
335 
336 	memset(&characteristics, 0, sizeof(characteristics));
337 	size = min(sizeof(characteristics), size);
338 	memcpy(&characteristics, info->buffer.pointer, size);
339 
340 	atif->backlight_caps.caps_valid = true;
341 	atif->backlight_caps.min_input_signal =
342 			characteristics.min_input_signal;
343 	atif->backlight_caps.max_input_signal =
344 			characteristics.max_input_signal;
345 out:
346 	kfree(info);
347 	return err;
348 }
349 
350 /**
351  * amdgpu_atif_get_sbios_requests - get requested sbios event
352  *
353  * @atif: acpi handle
354  * @req: atif sbios request struct
355  *
356  * Execute the ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS ATIF function
357  * to determine what requests the sbios is making to the driver
358  * (all asics).
359  * Returns 0 on success, error on failure.
360  */
361 static int amdgpu_atif_get_sbios_requests(struct amdgpu_atif *atif,
362 					  struct atif_sbios_requests *req)
363 {
364 	union acpi_object *info;
365 	size_t size;
366 	int count = 0;
367 
368 	info = amdgpu_atif_call(atif, ATIF_FUNCTION_GET_SYSTEM_BIOS_REQUESTS,
369 				NULL);
370 	if (!info)
371 		return -EIO;
372 
373 	size = *(u16 *)info->buffer.pointer;
374 	if (size < 0xd) {
375 		count = -EINVAL;
376 		goto out;
377 	}
378 	memset(req, 0, sizeof(*req));
379 
380 	size = min(sizeof(*req), size);
381 	memcpy(req, info->buffer.pointer, size);
382 	DRM_DEBUG_DRIVER("SBIOS pending requests: %#x\n", req->pending);
383 
384 	count = hweight32(req->pending);
385 
386 out:
387 	kfree(info);
388 	return count;
389 }
390 
391 /**
392  * amdgpu_atif_handler - handle ATIF notify requests
393  *
394  * @adev: amdgpu_device pointer
395  * @event: atif sbios request struct
396  *
397  * Checks the acpi event and if it matches an atif event,
398  * handles it.
399  *
400  * Returns:
401  * NOTIFY_BAD or NOTIFY_DONE, depending on the event.
402  */
403 static int amdgpu_atif_handler(struct amdgpu_device *adev,
404 			       struct acpi_bus_event *event)
405 {
406 	struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
407 	int count;
408 
409 	DRM_DEBUG_DRIVER("event, device_class = %s, type = %#x\n",
410 			event->device_class, event->type);
411 
412 	if (strcmp(event->device_class, ACPI_VIDEO_CLASS) != 0)
413 		return NOTIFY_DONE;
414 
415 	/* Is this actually our event? */
416 	if (!atif->notification_cfg.enabled ||
417 	    event->type != atif->notification_cfg.command_code) {
418 		/* These events will generate keypresses otherwise */
419 		if (event->type == ACPI_VIDEO_NOTIFY_PROBE)
420 			return NOTIFY_BAD;
421 		else
422 			return NOTIFY_DONE;
423 	}
424 
425 	if (atif->functions.sbios_requests) {
426 		struct atif_sbios_requests req;
427 
428 		/* Check pending SBIOS requests */
429 		count = amdgpu_atif_get_sbios_requests(atif, &req);
430 
431 		if (count <= 0)
432 			return NOTIFY_BAD;
433 
434 		DRM_DEBUG_DRIVER("ATIF: %d pending SBIOS requests\n", count);
435 
436 		if (req.pending & ATIF_PANEL_BRIGHTNESS_CHANGE_REQUEST) {
437 			if (atif->bd) {
438 				DRM_DEBUG_DRIVER("Changing brightness to %d\n",
439 						 req.backlight_level);
440 				/*
441 				 * XXX backlight_device_set_brightness() is
442 				 * hardwired to post BACKLIGHT_UPDATE_SYSFS.
443 				 * It probably should accept 'reason' parameter.
444 				 */
445 				backlight_device_set_brightness(atif->bd, req.backlight_level);
446 			}
447 		}
448 
449 		if (req.pending & ATIF_DGPU_DISPLAY_EVENT) {
450 			if (adev->flags & AMD_IS_PX) {
451 				pm_runtime_get_sync(adev_to_drm(adev)->dev);
452 				/* Just fire off a uevent and let userspace tell us what to do */
453 				drm_helper_hpd_irq_event(adev_to_drm(adev));
454 				pm_runtime_mark_last_busy(adev_to_drm(adev)->dev);
455 				pm_runtime_put_autosuspend(adev_to_drm(adev)->dev);
456 			}
457 		}
458 		/* TODO: check other events */
459 	}
460 
461 	/* We've handled the event, stop the notifier chain. The ACPI interface
462 	 * overloads ACPI_VIDEO_NOTIFY_PROBE, we don't want to send that to
463 	 * userspace if the event was generated only to signal a SBIOS
464 	 * request.
465 	 */
466 	return NOTIFY_BAD;
467 }
468 
469 /* Call the ATCS method
470  */
471 /**
472  * amdgpu_atcs_call - call an ATCS method
473  *
474  * @atcs: atcs structure
475  * @function: the ATCS function to execute
476  * @params: ATCS function params
477  *
478  * Executes the requested ATCS function (all asics).
479  * Returns a pointer to the acpi output buffer.
480  */
481 static union acpi_object *amdgpu_atcs_call(struct amdgpu_atcs *atcs,
482 					   int function,
483 					   struct acpi_buffer *params)
484 {
485 	acpi_status status;
486 	union acpi_object atcs_arg_elements[2];
487 	struct acpi_object_list atcs_arg;
488 	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
489 
490 	atcs_arg.count = 2;
491 	atcs_arg.pointer = &atcs_arg_elements[0];
492 
493 	atcs_arg_elements[0].type = ACPI_TYPE_INTEGER;
494 	atcs_arg_elements[0].integer.value = function;
495 
496 	if (params) {
497 		atcs_arg_elements[1].type = ACPI_TYPE_BUFFER;
498 		atcs_arg_elements[1].buffer.length = params->length;
499 		atcs_arg_elements[1].buffer.pointer = params->pointer;
500 	} else {
501 		/* We need a second fake parameter */
502 		atcs_arg_elements[1].type = ACPI_TYPE_INTEGER;
503 		atcs_arg_elements[1].integer.value = 0;
504 	}
505 
506 	status = acpi_evaluate_object(atcs->handle, NULL, &atcs_arg, &buffer);
507 
508 	/* Fail only if calling the method fails and ATIF is supported */
509 	if (ACPI_FAILURE(status) && status != AE_NOT_FOUND) {
510 		DRM_DEBUG_DRIVER("failed to evaluate ATCS got %s\n",
511 				 acpi_format_exception(status));
512 		kfree(buffer.pointer);
513 		return NULL;
514 	}
515 
516 	return buffer.pointer;
517 }
518 
519 /**
520  * amdgpu_atcs_parse_functions - parse supported functions
521  *
522  * @f: supported functions struct
523  * @mask: supported functions mask from ATCS
524  *
525  * Use the supported functions mask from ATCS function
526  * ATCS_FUNCTION_VERIFY_INTERFACE to determine what functions
527  * are supported (all asics).
528  */
529 static void amdgpu_atcs_parse_functions(struct amdgpu_atcs_functions *f, u32 mask)
530 {
531 	f->get_ext_state = mask & ATCS_GET_EXTERNAL_STATE_SUPPORTED;
532 	f->pcie_perf_req = mask & ATCS_PCIE_PERFORMANCE_REQUEST_SUPPORTED;
533 	f->pcie_dev_rdy = mask & ATCS_PCIE_DEVICE_READY_NOTIFICATION_SUPPORTED;
534 	f->pcie_bus_width = mask & ATCS_SET_PCIE_BUS_WIDTH_SUPPORTED;
535 	f->power_shift_control = mask & ATCS_SET_POWER_SHIFT_CONTROL_SUPPORTED;
536 }
537 
538 /**
539  * amdgpu_atcs_verify_interface - verify ATCS
540  *
541  * @atcs: amdgpu atcs struct
542  *
543  * Execute the ATCS_FUNCTION_VERIFY_INTERFACE ATCS function
544  * to initialize ATCS and determine what features are supported
545  * (all asics).
546  * returns 0 on success, error on failure.
547  */
548 static int amdgpu_atcs_verify_interface(struct amdgpu_atcs *atcs)
549 {
550 	union acpi_object *info;
551 	struct atcs_verify_interface output;
552 	size_t size;
553 	int err = 0;
554 
555 	info = amdgpu_atcs_call(atcs, ATCS_FUNCTION_VERIFY_INTERFACE, NULL);
556 	if (!info)
557 		return -EIO;
558 
559 	memset(&output, 0, sizeof(output));
560 
561 	size = *(u16 *) info->buffer.pointer;
562 	if (size < 8) {
563 		DRM_INFO("ATCS buffer is too small: %zu\n", size);
564 		err = -EINVAL;
565 		goto out;
566 	}
567 	size = min(sizeof(output), size);
568 
569 	memcpy(&output, info->buffer.pointer, size);
570 
571 	/* TODO: check version? */
572 	DRM_DEBUG_DRIVER("ATCS version %u\n", output.version);
573 
574 	amdgpu_atcs_parse_functions(&atcs->functions, output.function_bits);
575 
576 out:
577 	kfree(info);
578 	return err;
579 }
580 
581 /**
582  * amdgpu_acpi_is_pcie_performance_request_supported
583  *
584  * @adev: amdgpu_device pointer
585  *
586  * Check if the ATCS pcie_perf_req and pcie_dev_rdy methods
587  * are supported (all asics).
588  * returns true if supported, false if not.
589  */
590 bool amdgpu_acpi_is_pcie_performance_request_supported(struct amdgpu_device *adev)
591 {
592 	struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
593 
594 	if (atcs->functions.pcie_perf_req && atcs->functions.pcie_dev_rdy)
595 		return true;
596 
597 	return false;
598 }
599 
600 /**
601  * amdgpu_acpi_is_power_shift_control_supported
602  *
603  * Check if the ATCS power shift control method
604  * is supported.
605  * returns true if supported, false if not.
606  */
607 bool amdgpu_acpi_is_power_shift_control_supported(void)
608 {
609 	return amdgpu_acpi_priv.atcs.functions.power_shift_control;
610 }
611 
612 /**
613  * amdgpu_acpi_pcie_notify_device_ready
614  *
615  * @adev: amdgpu_device pointer
616  *
617  * Executes the PCIE_DEVICE_READY_NOTIFICATION method
618  * (all asics).
619  * returns 0 on success, error on failure.
620  */
621 int amdgpu_acpi_pcie_notify_device_ready(struct amdgpu_device *adev)
622 {
623 	union acpi_object *info;
624 	struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
625 
626 	if (!atcs->functions.pcie_dev_rdy)
627 		return -EINVAL;
628 
629 	info = amdgpu_atcs_call(atcs, ATCS_FUNCTION_PCIE_DEVICE_READY_NOTIFICATION, NULL);
630 	if (!info)
631 		return -EIO;
632 
633 	kfree(info);
634 
635 	return 0;
636 }
637 
638 /**
639  * amdgpu_acpi_pcie_performance_request
640  *
641  * @adev: amdgpu_device pointer
642  * @perf_req: requested perf level (pcie gen speed)
643  * @advertise: set advertise caps flag if set
644  *
645  * Executes the PCIE_PERFORMANCE_REQUEST method to
646  * change the pcie gen speed (all asics).
647  * returns 0 on success, error on failure.
648  */
649 int amdgpu_acpi_pcie_performance_request(struct amdgpu_device *adev,
650 					 u8 perf_req, bool advertise)
651 {
652 	union acpi_object *info;
653 	struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
654 	struct atcs_pref_req_input atcs_input;
655 	struct atcs_pref_req_output atcs_output;
656 	struct acpi_buffer params;
657 	size_t size;
658 	u32 retry = 3;
659 
660 	if (amdgpu_acpi_pcie_notify_device_ready(adev))
661 		return -EINVAL;
662 
663 	if (!atcs->functions.pcie_perf_req)
664 		return -EINVAL;
665 
666 	atcs_input.size = sizeof(struct atcs_pref_req_input);
667 	/* client id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
668 	atcs_input.client_id = adev->pdev->devfn | (adev->pdev->bus->number << 8);
669 	atcs_input.valid_flags_mask = ATCS_VALID_FLAGS_MASK;
670 	atcs_input.flags = ATCS_WAIT_FOR_COMPLETION;
671 	if (advertise)
672 		atcs_input.flags |= ATCS_ADVERTISE_CAPS;
673 	atcs_input.req_type = ATCS_PCIE_LINK_SPEED;
674 	atcs_input.perf_req = perf_req;
675 
676 	params.length = sizeof(struct atcs_pref_req_input);
677 	params.pointer = &atcs_input;
678 
679 	while (retry--) {
680 		info = amdgpu_atcs_call(atcs, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST, &params);
681 		if (!info)
682 			return -EIO;
683 
684 		memset(&atcs_output, 0, sizeof(atcs_output));
685 
686 		size = *(u16 *) info->buffer.pointer;
687 		if (size < 3) {
688 			DRM_INFO("ATCS buffer is too small: %zu\n", size);
689 			kfree(info);
690 			return -EINVAL;
691 		}
692 		size = min(sizeof(atcs_output), size);
693 
694 		memcpy(&atcs_output, info->buffer.pointer, size);
695 
696 		kfree(info);
697 
698 		switch (atcs_output.ret_val) {
699 		case ATCS_REQUEST_REFUSED:
700 		default:
701 			return -EINVAL;
702 		case ATCS_REQUEST_COMPLETE:
703 			return 0;
704 		case ATCS_REQUEST_IN_PROGRESS:
705 			udelay(10);
706 			break;
707 		}
708 	}
709 
710 	return 0;
711 }
712 
713 /**
714  * amdgpu_acpi_power_shift_control
715  *
716  * @adev: amdgpu_device pointer
717  * @dev_state: device acpi state
718  * @drv_state: driver state
719  *
720  * Executes the POWER_SHIFT_CONTROL method to
721  * communicate current dGPU device state and
722  * driver state to APU/SBIOS.
723  * returns 0 on success, error on failure.
724  */
725 int amdgpu_acpi_power_shift_control(struct amdgpu_device *adev,
726 				    u8 dev_state, bool drv_state)
727 {
728 	union acpi_object *info;
729 	struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
730 	struct atcs_pwr_shift_input atcs_input;
731 	struct acpi_buffer params;
732 
733 	if (!amdgpu_acpi_is_power_shift_control_supported())
734 		return -EINVAL;
735 
736 	atcs_input.size = sizeof(struct atcs_pwr_shift_input);
737 	/* dGPU id (bit 2-0: func num, 7-3: dev num, 15-8: bus num) */
738 	atcs_input.dgpu_id = adev->pdev->devfn | (adev->pdev->bus->number << 8);
739 	atcs_input.dev_acpi_state = dev_state;
740 	atcs_input.drv_state = drv_state;
741 
742 	params.length = sizeof(struct atcs_pwr_shift_input);
743 	params.pointer = &atcs_input;
744 
745 	info = amdgpu_atcs_call(atcs, ATCS_FUNCTION_POWER_SHIFT_CONTROL, &params);
746 	if (!info) {
747 		DRM_ERROR("ATCS PSC update failed\n");
748 		return -EIO;
749 	}
750 
751 	return 0;
752 }
753 
754 /**
755  * amdgpu_acpi_smart_shift_update - update dGPU device state to SBIOS
756  *
757  * @dev: drm_device pointer
758  * @ss_state: current smart shift event
759  *
760  * returns 0 on success,
761  * otherwise return error number.
762  */
763 int amdgpu_acpi_smart_shift_update(struct drm_device *dev, enum amdgpu_ss ss_state)
764 {
765 	struct amdgpu_device *adev = drm_to_adev(dev);
766 	int r;
767 
768 	if (!amdgpu_device_supports_smart_shift(dev))
769 		return 0;
770 
771 	switch (ss_state) {
772 	/* SBIOS trigger “stop”, “enable” and “start” at D0, Driver Operational.
773 	 * SBIOS trigger “stop” at D3, Driver Not Operational.
774 	 * SBIOS trigger “stop” and “disable” at D0, Driver NOT operational.
775 	 */
776 	case AMDGPU_SS_DRV_LOAD:
777 		r = amdgpu_acpi_power_shift_control(adev,
778 						    AMDGPU_ATCS_PSC_DEV_STATE_D0,
779 						    AMDGPU_ATCS_PSC_DRV_STATE_OPR);
780 		break;
781 	case AMDGPU_SS_DEV_D0:
782 		r = amdgpu_acpi_power_shift_control(adev,
783 						    AMDGPU_ATCS_PSC_DEV_STATE_D0,
784 						    AMDGPU_ATCS_PSC_DRV_STATE_OPR);
785 		break;
786 	case AMDGPU_SS_DEV_D3:
787 		r = amdgpu_acpi_power_shift_control(adev,
788 						    AMDGPU_ATCS_PSC_DEV_STATE_D3_HOT,
789 						    AMDGPU_ATCS_PSC_DRV_STATE_NOT_OPR);
790 		break;
791 	case AMDGPU_SS_DRV_UNLOAD:
792 		r = amdgpu_acpi_power_shift_control(adev,
793 						    AMDGPU_ATCS_PSC_DEV_STATE_D0,
794 						    AMDGPU_ATCS_PSC_DRV_STATE_NOT_OPR);
795 		break;
796 	default:
797 		return -EINVAL;
798 	}
799 
800 	return r;
801 }
802 
803 /**
804  * amdgpu_acpi_event - handle notify events
805  *
806  * @nb: notifier block
807  * @val: val
808  * @data: acpi event
809  *
810  * Calls relevant amdgpu functions in response to various
811  * acpi events.
812  * Returns NOTIFY code
813  */
814 static int amdgpu_acpi_event(struct notifier_block *nb,
815 			     unsigned long val,
816 			     void *data)
817 {
818 	struct amdgpu_device *adev = container_of(nb, struct amdgpu_device, acpi_nb);
819 	struct acpi_bus_event *entry = (struct acpi_bus_event *)data;
820 
821 	if (strcmp(entry->device_class, ACPI_AC_CLASS) == 0) {
822 		if (power_supply_is_system_supplied() > 0)
823 			DRM_DEBUG_DRIVER("pm: AC\n");
824 		else
825 			DRM_DEBUG_DRIVER("pm: DC\n");
826 
827 		amdgpu_pm_acpi_event_handler(adev);
828 	}
829 
830 	/* Check for pending SBIOS requests */
831 	return amdgpu_atif_handler(adev, entry);
832 }
833 
834 /* Call all ACPI methods here */
835 /**
836  * amdgpu_acpi_init - init driver acpi support
837  *
838  * @adev: amdgpu_device pointer
839  *
840  * Verifies the AMD ACPI interfaces and registers with the acpi
841  * notifier chain (all asics).
842  * Returns 0 on success, error on failure.
843  */
844 int amdgpu_acpi_init(struct amdgpu_device *adev)
845 {
846 	struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
847 
848 	if (atif->notifications.brightness_change) {
849 		if (amdgpu_device_has_dc_support(adev)) {
850 #if defined(CONFIG_DRM_AMD_DC)
851 			struct amdgpu_display_manager *dm = &adev->dm;
852 			if (dm->backlight_dev[0])
853 				atif->bd = dm->backlight_dev[0];
854 #endif
855 		} else {
856 			struct drm_encoder *tmp;
857 
858 			/* Find the encoder controlling the brightness */
859 			list_for_each_entry(tmp, &adev_to_drm(adev)->mode_config.encoder_list,
860 					    head) {
861 				struct amdgpu_encoder *enc = to_amdgpu_encoder(tmp);
862 
863 				if ((enc->devices & (ATOM_DEVICE_LCD_SUPPORT)) &&
864 				    enc->enc_priv) {
865 					struct amdgpu_encoder_atom_dig *dig = enc->enc_priv;
866 					if (dig->bl_dev) {
867 						atif->bd = dig->bl_dev;
868 						break;
869 					}
870 				}
871 			}
872 		}
873 	}
874 	adev->acpi_nb.notifier_call = amdgpu_acpi_event;
875 	register_acpi_notifier(&adev->acpi_nb);
876 
877 	return 0;
878 }
879 
880 void amdgpu_acpi_get_backlight_caps(struct amdgpu_dm_backlight_caps *caps)
881 {
882 	struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
883 
884 	caps->caps_valid = atif->backlight_caps.caps_valid;
885 	caps->min_input_signal = atif->backlight_caps.min_input_signal;
886 	caps->max_input_signal = atif->backlight_caps.max_input_signal;
887 }
888 
889 /**
890  * amdgpu_acpi_fini - tear down driver acpi support
891  *
892  * @adev: amdgpu_device pointer
893  *
894  * Unregisters with the acpi notifier chain (all asics).
895  */
896 void amdgpu_acpi_fini(struct amdgpu_device *adev)
897 {
898 	unregister_acpi_notifier(&adev->acpi_nb);
899 }
900 
901 /**
902  * amdgpu_atif_pci_probe_handle - look up the ATIF handle
903  *
904  * @pdev: pci device
905  *
906  * Look up the ATIF handles (all asics).
907  * Returns true if the handle is found, false if not.
908  */
909 static bool amdgpu_atif_pci_probe_handle(struct pci_dev *pdev)
910 {
911 	char acpi_method_name[255] = { 0 };
912 	struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
913 	acpi_handle dhandle, atif_handle;
914 	acpi_status status;
915 	int ret;
916 
917 	dhandle = ACPI_HANDLE(&pdev->dev);
918 	if (!dhandle)
919 		return false;
920 
921 	status = acpi_get_handle(dhandle, "ATIF", &atif_handle);
922 	if (ACPI_FAILURE(status)) {
923 		return false;
924 	}
925 	amdgpu_acpi_priv.atif.handle = atif_handle;
926 	acpi_get_name(amdgpu_acpi_priv.atif.handle, ACPI_FULL_PATHNAME, &buffer);
927 	DRM_DEBUG_DRIVER("Found ATIF handle %s\n", acpi_method_name);
928 	ret = amdgpu_atif_verify_interface(&amdgpu_acpi_priv.atif);
929 	if (ret) {
930 		amdgpu_acpi_priv.atif.handle = 0;
931 		return false;
932 	}
933 	return true;
934 }
935 
936 /**
937  * amdgpu_atcs_pci_probe_handle - look up the ATCS handle
938  *
939  * @pdev: pci device
940  *
941  * Look up the ATCS handles (all asics).
942  * Returns true if the handle is found, false if not.
943  */
944 static bool amdgpu_atcs_pci_probe_handle(struct pci_dev *pdev)
945 {
946 	char acpi_method_name[255] = { 0 };
947 	struct acpi_buffer buffer = { sizeof(acpi_method_name), acpi_method_name };
948 	acpi_handle dhandle, atcs_handle;
949 	acpi_status status;
950 	int ret;
951 
952 	dhandle = ACPI_HANDLE(&pdev->dev);
953 	if (!dhandle)
954 		return false;
955 
956 	status = acpi_get_handle(dhandle, "ATCS", &atcs_handle);
957 	if (ACPI_FAILURE(status)) {
958 		return false;
959 	}
960 	amdgpu_acpi_priv.atcs.handle = atcs_handle;
961 	acpi_get_name(amdgpu_acpi_priv.atcs.handle, ACPI_FULL_PATHNAME, &buffer);
962 	DRM_DEBUG_DRIVER("Found ATCS handle %s\n", acpi_method_name);
963 	ret = amdgpu_atcs_verify_interface(&amdgpu_acpi_priv.atcs);
964 	if (ret) {
965 		amdgpu_acpi_priv.atcs.handle = 0;
966 		return false;
967 	}
968 	return true;
969 }
970 
971 /*
972  * amdgpu_acpi_detect - detect ACPI ATIF/ATCS methods
973  *
974  * Check if we have the ATIF/ATCS methods and populate
975  * the structures in the driver.
976  */
977 void amdgpu_acpi_detect(void)
978 {
979 	struct amdgpu_atif *atif = &amdgpu_acpi_priv.atif;
980 	struct amdgpu_atcs *atcs = &amdgpu_acpi_priv.atcs;
981 	struct pci_dev *pdev = NULL;
982 	int ret;
983 
984 	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
985 		if (!atif->handle)
986 			amdgpu_atif_pci_probe_handle(pdev);
987 		if (!atcs->handle)
988 			amdgpu_atcs_pci_probe_handle(pdev);
989 	}
990 
991 	while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_OTHER << 8, pdev)) != NULL) {
992 		if (!atif->handle)
993 			amdgpu_atif_pci_probe_handle(pdev);
994 		if (!atcs->handle)
995 			amdgpu_atcs_pci_probe_handle(pdev);
996 	}
997 
998 	if (atif->functions.sbios_requests && !atif->functions.system_params) {
999 		/* XXX check this workraround, if sbios request function is
1000 		 * present we have to see how it's configured in the system
1001 		 * params
1002 		 */
1003 		atif->functions.system_params = true;
1004 	}
1005 
1006 	if (atif->functions.system_params) {
1007 		ret = amdgpu_atif_get_notification_params(atif);
1008 		if (ret) {
1009 			DRM_DEBUG_DRIVER("Call to GET_SYSTEM_PARAMS failed: %d\n",
1010 					ret);
1011 			/* Disable notification */
1012 			atif->notification_cfg.enabled = false;
1013 		}
1014 	}
1015 
1016 	if (atif->functions.query_backlight_transfer_characteristics) {
1017 		ret = amdgpu_atif_query_backlight_caps(atif);
1018 		if (ret) {
1019 			DRM_DEBUG_DRIVER("Call to QUERY_BACKLIGHT_TRANSFER_CHARACTERISTICS failed: %d\n",
1020 					ret);
1021 			atif->backlight_caps.caps_valid = false;
1022 		}
1023 	} else {
1024 		atif->backlight_caps.caps_valid = false;
1025 	}
1026 }
1027 
1028 #if IS_ENABLED(CONFIG_SUSPEND)
1029 /**
1030  * amdgpu_acpi_is_s3_active
1031  *
1032  * @adev: amdgpu_device_pointer
1033  *
1034  * returns true if supported, false if not.
1035  */
1036 bool amdgpu_acpi_is_s3_active(struct amdgpu_device *adev)
1037 {
1038 	return !(adev->flags & AMD_IS_APU) ||
1039 		(pm_suspend_target_state == PM_SUSPEND_MEM);
1040 }
1041 
1042 /**
1043  * amdgpu_acpi_should_gpu_reset
1044  *
1045  * @adev: amdgpu_device_pointer
1046  *
1047  * returns true if should reset GPU, false if not
1048  */
1049 bool amdgpu_acpi_should_gpu_reset(struct amdgpu_device *adev)
1050 {
1051 	if (adev->flags & AMD_IS_APU)
1052 		return false;
1053 	return pm_suspend_target_state != PM_SUSPEND_TO_IDLE;
1054 }
1055 
1056 /**
1057  * amdgpu_acpi_is_s0ix_active
1058  *
1059  * @adev: amdgpu_device_pointer
1060  *
1061  * returns true if supported, false if not.
1062  */
1063 bool amdgpu_acpi_is_s0ix_active(struct amdgpu_device *adev)
1064 {
1065 	if (!(adev->flags & AMD_IS_APU) ||
1066 	    (pm_suspend_target_state != PM_SUSPEND_TO_IDLE))
1067 		return false;
1068 
1069 	if (!(acpi_gbl_FADT.flags & ACPI_FADT_LOW_POWER_S0)) {
1070 		dev_warn_once(adev->dev,
1071 			      "Power consumption will be higher as BIOS has not been configured for suspend-to-idle.\n"
1072 			      "To use suspend-to-idle change the sleep mode in BIOS setup.\n");
1073 		return false;
1074 	}
1075 
1076 #if !IS_ENABLED(CONFIG_AMD_PMC)
1077 	dev_warn_once(adev->dev,
1078 		      "Power consumption will be higher as the kernel has not been compiled with CONFIG_AMD_PMC.\n");
1079 	return false;
1080 #else
1081 	return true;
1082 #endif /* CONFIG_AMD_PMC */
1083 }
1084 
1085 #endif /* CONFIG_SUSPEND */
1086