acpi.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * AMD Platform Management Framework Driver
  4 *
  5 * Copyright (c) 2022, Advanced Micro Devices, Inc.
  6 * All Rights Reserved.
  7 *
  8 * Author: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
  9 */
 10
 11#include <linux/acpi.h>
 12#include "pmf.h"
 13
 14#define APMF_CQL_NOTIFICATION  2
 15#define APMF_AMT_NOTIFICATION  3
 16
 17static union acpi_object *apmf_if_call(struct amd_pmf_dev *pdev, int fn, struct acpi_buffer *param)
 18{
 19	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 20	acpi_handle ahandle = ACPI_HANDLE(pdev->dev);
 21	struct acpi_object_list apmf_if_arg_list;
 22	union acpi_object apmf_if_args[2];
 23	acpi_status status;
 24
 25	apmf_if_arg_list.count = 2;
 26	apmf_if_arg_list.pointer = &apmf_if_args[0];
 27
 28	apmf_if_args[0].type = ACPI_TYPE_INTEGER;
 29	apmf_if_args[0].integer.value = fn;
 30
 31	if (param) {
 32		apmf_if_args[1].type = ACPI_TYPE_BUFFER;
 33		apmf_if_args[1].buffer.length = param->length;
 34		apmf_if_args[1].buffer.pointer = param->pointer;
 35	} else {
 36		apmf_if_args[1].type = ACPI_TYPE_INTEGER;
 37		apmf_if_args[1].integer.value = 0;
 38	}
 39
 40	status = acpi_evaluate_object(ahandle, "APMF", &apmf_if_arg_list, &buffer);
 41	if (ACPI_FAILURE(status)) {
 42		dev_err(pdev->dev, "APMF method:%d call failed\n", fn);
 43		kfree(buffer.pointer);
 44		return NULL;
 45	}
 46
 47	return buffer.pointer;
 48}
 49
 50static int apmf_if_call_store_buffer(struct amd_pmf_dev *pdev, int fn, void *dest, size_t out_sz)
 51{
 52	union acpi_object *info;
 53	size_t size;
 54	int err = 0;
 55
 56	info = apmf_if_call(pdev, fn, NULL);
 57	if (!info)
 58		return -EIO;
 59
 60	if (info->type != ACPI_TYPE_BUFFER) {
 61		dev_err(pdev->dev, "object is not a buffer\n");
 62		err = -EINVAL;
 63		goto out;
 64	}
 65
 66	if (info->buffer.length < 2) {
 67		dev_err(pdev->dev, "buffer too small\n");
 68		err = -EINVAL;
 69		goto out;
 70	}
 71
 72	size = *(u16 *)info->buffer.pointer;
 73	if (info->buffer.length < size) {
 74		dev_err(pdev->dev, "buffer smaller then headersize %u < %zu\n",
 75			info->buffer.length, size);
 76		err = -EINVAL;
 77		goto out;
 78	}
 79
 80	if (size < out_sz) {
 81		dev_err(pdev->dev, "buffer too small %zu\n", size);
 82		err = -EINVAL;
 83		goto out;
 84	}
 85
 86	memcpy(dest, info->buffer.pointer, out_sz);
 87
 88out:
 89	kfree(info);
 90	return err;
 91}
 92
 93static union acpi_object *apts_if_call(struct amd_pmf_dev *pdev, u32 state_index)
 94{
 95	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
 96	acpi_handle ahandle = ACPI_HANDLE(pdev->dev);
 97	struct acpi_object_list apts_if_arg_list;
 98	union acpi_object apts_if_args[3];
 99	acpi_status status;
100
101	apts_if_arg_list.count = 3;
102	apts_if_arg_list.pointer = &apts_if_args[0];
103
104	apts_if_args[0].type = ACPI_TYPE_INTEGER;
105	apts_if_args[0].integer.value = 1;
106	apts_if_args[1].type = ACPI_TYPE_INTEGER;
107	apts_if_args[1].integer.value = state_index;
108	apts_if_args[2].type = ACPI_TYPE_INTEGER;
109	apts_if_args[2].integer.value = 0;
110
111	status = acpi_evaluate_object(ahandle, "APTS", &apts_if_arg_list, &buffer);
112	if (ACPI_FAILURE(status)) {
113		dev_err(pdev->dev, "APTS state_idx:%u call failed\n", state_index);
114		kfree(buffer.pointer);
115		return NULL;
116	}
117
118	return buffer.pointer;
119}
120
121static int apts_if_call_store_buffer(struct amd_pmf_dev *pdev,
122				     u32 index, void *data, size_t out_sz)
123{
124	union acpi_object *info;
125	size_t size;
126	int err = 0;
127
128	info = apts_if_call(pdev, index);
129	if (!info)
130		return -EIO;
131
132	if (info->type != ACPI_TYPE_BUFFER) {
133		dev_err(pdev->dev, "object is not a buffer\n");
134		err = -EINVAL;
135		goto out;
136	}
137
138	size = *(u16 *)info->buffer.pointer;
139	if (info->buffer.length < size) {
140		dev_err(pdev->dev, "buffer smaller than header size %u < %zu\n",
141			info->buffer.length, size);
142		err = -EINVAL;
143		goto out;
144	}
145
146	if (size < out_sz) {
147		dev_err(pdev->dev, "buffer too small %zu\n", size);
148		err = -EINVAL;
149		goto out;
150	}
151
152	memcpy(data, info->buffer.pointer, out_sz);
153out:
154	kfree(info);
155	return err;
156}
157
158int is_apmf_func_supported(struct amd_pmf_dev *pdev, unsigned long index)
159{
160	/* If bit-n is set, that indicates function n+1 is supported */
161	return !!(pdev->supported_func & BIT(index - 1));
162}
163
164int is_apmf_bios_input_notifications_supported(struct amd_pmf_dev *pdev)
165{
166	return !!(pdev->notifications & CUSTOM_BIOS_INPUT_BITS);
167}
168
169int apts_get_static_slider_granular_v2(struct amd_pmf_dev *pdev,
170				       struct amd_pmf_apts_granular_output *data, u32 apts_idx)
171{
172	if (!is_apmf_func_supported(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR))
173		return -EINVAL;
174
175	return apts_if_call_store_buffer(pdev, apts_idx, data, sizeof(*data));
176}
177
178int apmf_get_static_slider_granular_v2(struct amd_pmf_dev *pdev,
179				       struct apmf_static_slider_granular_output_v2 *data)
180{
181	if (!is_apmf_func_supported(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR))
182		return -EINVAL;
183
184	return apmf_if_call_store_buffer(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR,
185					 data, sizeof(*data));
186}
187
188int apmf_get_static_slider_granular(struct amd_pmf_dev *pdev,
189				    struct apmf_static_slider_granular_output *data)
190{
191	if (!is_apmf_func_supported(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR))
192		return -EINVAL;
193
194	return apmf_if_call_store_buffer(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR,
195									 data, sizeof(*data));
196}
197
198int apmf_os_power_slider_update(struct amd_pmf_dev *pdev, u8 event)
199{
200	struct os_power_slider args;
201	struct acpi_buffer params;
202	union acpi_object *info;
203
204	args.size = sizeof(args);
205	args.slider_event = event;
206
207	params.length = sizeof(args);
208	params.pointer = (void *)&args;
209
210	info = apmf_if_call(pdev, APMF_FUNC_OS_POWER_SLIDER_UPDATE, &params);
211	if (!info)
212		return -EIO;
213
214	kfree(info);
215	return 0;
216}
217
218static void apmf_sbios_heartbeat_notify(struct work_struct *work)
219{
220	struct amd_pmf_dev *dev = container_of(work, struct amd_pmf_dev, heart_beat.work);
221	union acpi_object *info;
222
223	dev_dbg(dev->dev, "Sending heartbeat to SBIOS\n");
224	info = apmf_if_call(dev, APMF_FUNC_SBIOS_HEARTBEAT, NULL);
225	if (!info)
226		return;
227
228	schedule_delayed_work(&dev->heart_beat, secs_to_jiffies(dev->hb_interval));
229	kfree(info);
230}
231
232int amd_pmf_notify_sbios_heartbeat_event_v2(struct amd_pmf_dev *dev, u8 flag)
233{
234	struct sbios_hb_event_v2 args = { };
235	struct acpi_buffer params;
236	union acpi_object *info;
237
238	args.size = sizeof(args);
239
240	switch (flag) {
241	case ON_LOAD:
242		args.load = 1;
243		break;
244	case ON_UNLOAD:
245		args.unload = 1;
246		break;
247	case ON_SUSPEND:
248		args.suspend = 1;
249		break;
250	case ON_RESUME:
251		args.resume = 1;
252		break;
253	default:
254		dev_dbg(dev->dev, "Failed to send v2 heartbeat event, flag:0x%x\n", flag);
255		return -EINVAL;
256	}
257
258	params.length = sizeof(args);
259	params.pointer = &args;
260
261	info = apmf_if_call(dev, APMF_FUNC_SBIOS_HEARTBEAT_V2, &params);
262	if (!info)
263		return -EIO;
264
265	kfree(info);
266	return 0;
267}
268
269int apmf_update_fan_idx(struct amd_pmf_dev *pdev, bool manual, u32 idx)
270{
271	union acpi_object *info;
272	struct apmf_fan_idx args;
273	struct acpi_buffer params;
274
275	args.size = sizeof(args);
276	args.fan_ctl_mode = manual;
277	args.fan_ctl_idx = idx;
278
279	params.length = sizeof(args);
280	params.pointer = (void *)&args;
281
282	info = apmf_if_call(pdev, APMF_FUNC_SET_FAN_IDX, &params);
283	if (!info)
284		return -EIO;
285
286	kfree(info);
287	return 0;
288}
289
290static int apmf_notify_smart_pc_update(struct amd_pmf_dev *pdev, u32 val, u32 preq, u32 index)
291{
292	struct amd_pmf_notify_smart_pc_update args;
293	struct acpi_buffer params;
294	union acpi_object *info;
295
296	args.size = sizeof(args);
297	args.pending_req = preq;
298	args.custom_bios[index] = val;
299
300	params.length = sizeof(args);
301	params.pointer = &args;
302
303	info = apmf_if_call(pdev, APMF_FUNC_NOTIFY_SMART_PC_UPDATES, &params);
304	if (!info)
305		return -EIO;
306
307	kfree(info);
308	dev_dbg(pdev->dev, "Notify smart pc update, val: %u\n", val);
309
310	return 0;
311}
312
313int apmf_get_auto_mode_def(struct amd_pmf_dev *pdev, struct apmf_auto_mode *data)
314{
315	return apmf_if_call_store_buffer(pdev, APMF_FUNC_AUTO_MODE, data, sizeof(*data));
316}
317
318int apmf_get_sbios_requests_v2(struct amd_pmf_dev *pdev, struct apmf_sbios_req_v2 *req)
319{
320	return apmf_if_call_store_buffer(pdev, APMF_FUNC_SBIOS_REQUESTS, req, sizeof(*req));
321}
322
323int apmf_get_sbios_requests_v1(struct amd_pmf_dev *pdev, struct apmf_sbios_req_v1 *req)
324{
325	return apmf_if_call_store_buffer(pdev, APMF_FUNC_SBIOS_REQUESTS, req, sizeof(*req));
326}
327
328int apmf_get_sbios_requests(struct amd_pmf_dev *pdev, struct apmf_sbios_req *req)
329{
330	return apmf_if_call_store_buffer(pdev, APMF_FUNC_SBIOS_REQUESTS,
331									 req, sizeof(*req));
332}
333
334static void amd_pmf_handle_early_preq(struct amd_pmf_dev *pdev)
335{
336	if (!pdev->cb_flag)
337		return;
338
339	amd_pmf_invoke_cmd_enact(pdev);
340	pdev->cb_flag = false;
341}
342
343static void apmf_event_handler_v2(acpi_handle handle, u32 event, void *data)
344{
345	struct amd_pmf_dev *pmf_dev = data;
346	int ret;
347
348	guard(mutex)(&pmf_dev->cb_mutex);
349
350	ret = apmf_get_sbios_requests_v2(pmf_dev, &pmf_dev->req);
351	if (ret) {
352		dev_err(pmf_dev->dev, "Failed to get v2 SBIOS requests: %d\n", ret);
353		return;
354	}
355
356	dev_dbg(pmf_dev->dev, "Pending request (preq): 0x%x\n", pmf_dev->req.pending_req);
357
358	amd_pmf_handle_early_preq(pmf_dev);
359}
360
361static void apmf_event_handler_v1(acpi_handle handle, u32 event, void *data)
362{
363	struct amd_pmf_dev *pmf_dev = data;
364	int ret;
365
366	guard(mutex)(&pmf_dev->cb_mutex);
367
368	ret = apmf_get_sbios_requests_v1(pmf_dev, &pmf_dev->req1);
369	if (ret) {
370		dev_err(pmf_dev->dev, "Failed to get v1 SBIOS requests: %d\n", ret);
371		return;
372	}
373
374	dev_dbg(pmf_dev->dev, "Pending request (preq1): 0x%x\n", pmf_dev->req1.pending_req);
375
376	amd_pmf_handle_early_preq(pmf_dev);
377}
378
379static void apmf_event_handler(acpi_handle handle, u32 event, void *data)
380{
381	struct amd_pmf_dev *pmf_dev = data;
382	struct apmf_sbios_req req;
383	int ret;
384
385	guard(mutex)(&pmf_dev->update_mutex);
386	ret = apmf_get_sbios_requests(pmf_dev, &req);
387	if (ret) {
388		dev_err(pmf_dev->dev, "Failed to get SBIOS requests:%d\n", ret);
389		return;
390	}
391
392	if (req.pending_req & BIT(APMF_AMT_NOTIFICATION)) {
393		dev_dbg(pmf_dev->dev, "AMT is supported and notifications %s\n",
394			req.amt_event ? "Enabled" : "Disabled");
395		pmf_dev->amt_enabled = !!req.amt_event;
396
397		if (pmf_dev->amt_enabled)
398			amd_pmf_handle_amt(pmf_dev);
399		else
400			amd_pmf_reset_amt(pmf_dev);
401	}
402
403	if (req.pending_req & BIT(APMF_CQL_NOTIFICATION)) {
404		dev_dbg(pmf_dev->dev, "CQL is supported and notifications %s\n",
405			req.cql_event ? "Enabled" : "Disabled");
406
407		/* update the target mode information */
408		if (pmf_dev->amt_enabled)
409			amd_pmf_update_2_cql(pmf_dev, req.cql_event);
410	}
411}
412
413static int apmf_if_verify_interface(struct amd_pmf_dev *pdev)
414{
415	struct apmf_verify_interface output;
416	int err;
417
418	err = apmf_if_call_store_buffer(pdev, APMF_FUNC_VERIFY_INTERFACE, &output, sizeof(output));
419	if (err)
420		return err;
421
422	/* only set if not already set by a quirk */
423	if (!pdev->supported_func)
424		pdev->supported_func = output.supported_functions;
425
426	dev_dbg(pdev->dev, "supported functions:0x%x notifications:0x%x version:%u\n",
427		output.supported_functions, output.notification_mask, output.version);
428
429	pdev->pmf_if_version = output.version;
430
431	pdev->notifications =  output.notification_mask;
432	return 0;
433}
434
435static int apmf_get_system_params(struct amd_pmf_dev *dev)
436{
437	struct apmf_system_params params;
438	int err;
439
440	if (!is_apmf_func_supported(dev, APMF_FUNC_GET_SYS_PARAMS))
441		return -EINVAL;
442
443	err = apmf_if_call_store_buffer(dev, APMF_FUNC_GET_SYS_PARAMS, &params, sizeof(params));
444	if (err)
445		return err;
446
447	dev_dbg(dev->dev, "system params mask:0x%x flags:0x%x cmd_code:0x%x heartbeat:%d\n",
448		params.valid_mask,
449		params.flags,
450		params.command_code,
451		params.heartbeat_int);
452	params.flags = params.flags & params.valid_mask;
453	dev->hb_interval = params.heartbeat_int;
454
455	return 0;
456}
457
458int apmf_get_dyn_slider_def_ac(struct amd_pmf_dev *pdev, struct apmf_dyn_slider_output *data)
459{
460	return apmf_if_call_store_buffer(pdev, APMF_FUNC_DYN_SLIDER_AC, data, sizeof(*data));
461}
462
463int apmf_get_dyn_slider_def_dc(struct amd_pmf_dev *pdev, struct apmf_dyn_slider_output *data)
464{
465	return apmf_if_call_store_buffer(pdev, APMF_FUNC_DYN_SLIDER_DC, data, sizeof(*data));
466}
467
468static apmf_event_handler_t apmf_event_handlers[] = {
469	[PMF_IF_V1] = apmf_event_handler_v1,
470	[PMF_IF_V2] = apmf_event_handler_v2,
471};
472
473int apmf_install_handler(struct amd_pmf_dev *pmf_dev)
474{
475	acpi_handle ahandle = ACPI_HANDLE(pmf_dev->dev);
476	acpi_status status;
477
478	/* Install the APMF Notify handler */
479	if (is_apmf_func_supported(pmf_dev, APMF_FUNC_AUTO_MODE) &&
480	    is_apmf_func_supported(pmf_dev, APMF_FUNC_SBIOS_REQUESTS)) {
481		status = acpi_install_notify_handler(ahandle, ACPI_ALL_NOTIFY,
482						     apmf_event_handler, pmf_dev);
483		if (ACPI_FAILURE(status)) {
484			dev_err(pmf_dev->dev, "failed to install notify handler\n");
485			return -ENODEV;
486		}
487
488		/* Call the handler once manually to catch up with possibly missed notifies. */
489		apmf_event_handler(ahandle, 0, pmf_dev);
490	}
491
492	if (!pmf_dev->smart_pc_enabled)
493		return -EINVAL;
494
495	switch (pmf_dev->pmf_if_version) {
496	case PMF_IF_V1:
497		if (!is_apmf_bios_input_notifications_supported(pmf_dev))
498			break;
499		fallthrough;
500	case PMF_IF_V2:
501		status = acpi_install_notify_handler(ahandle, ACPI_ALL_NOTIFY,
502				apmf_event_handlers[pmf_dev->pmf_if_version], pmf_dev);
503		if (ACPI_FAILURE(status)) {
504			dev_err(pmf_dev->dev,
505				"failed to install notify handler v%d for custom BIOS inputs\n",
506				pmf_dev->pmf_if_version);
507			return -ENODEV;
508		}
509		break;
510	default:
511		break;
512	}
513
514	return 0;
515}
516
517int apmf_check_smart_pc(struct amd_pmf_dev *pmf_dev)
518{
519	struct platform_device *pdev = to_platform_device(pmf_dev->dev);
520
521	pmf_dev->res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
522	if (!pmf_dev->res) {
523		dev_dbg(pmf_dev->dev, "Failed to get I/O memory resource\n");
524		return -EINVAL;
525	}
526
527	pmf_dev->policy_addr = pmf_dev->res->start;
528	/*
529	 * We cannot use resource_size() here because it adds an extra byte to round off the size.
530	 * In the case of PMF ResourceTemplate(), this rounding is already handled within the _CRS.
531	 * Using resource_size() would increase the resource size by 1, causing a mismatch with the
532	 * length field and leading to issues. Therefore, simply use end-start of the ACPI resource
533	 * to obtain the actual length.
534	 */
535	pmf_dev->policy_sz = pmf_dev->res->end - pmf_dev->res->start;
536
537	if (!pmf_dev->policy_addr || pmf_dev->policy_sz > POLICY_BUF_MAX_SZ ||
538	    pmf_dev->policy_sz == 0) {
539		dev_err(pmf_dev->dev, "Incorrect policy params, possibly a SBIOS bug\n");
540		return -EINVAL;
541	}
542
543	return 0;
544}
545
546int amd_pmf_smartpc_apply_bios_output(struct amd_pmf_dev *dev, u32 val, u32 preq, u32 idx)
547{
548	if (!is_apmf_func_supported(dev, APMF_FUNC_NOTIFY_SMART_PC_UPDATES))
549		return -EINVAL;
550
551	return apmf_notify_smart_pc_update(dev, val, preq, idx);
552}
553
554void apmf_acpi_deinit(struct amd_pmf_dev *pmf_dev)
555{
556	acpi_handle ahandle = ACPI_HANDLE(pmf_dev->dev);
557
558	if (pmf_dev->hb_interval && pmf_dev->pmf_if_version == PMF_IF_V1)
559		cancel_delayed_work_sync(&pmf_dev->heart_beat);
560
561	if (is_apmf_func_supported(pmf_dev, APMF_FUNC_AUTO_MODE) &&
562	    is_apmf_func_supported(pmf_dev, APMF_FUNC_SBIOS_REQUESTS))
563		acpi_remove_notify_handler(ahandle, ACPI_ALL_NOTIFY, apmf_event_handler);
564
565	if (!pmf_dev->smart_pc_enabled)
566		return;
567
568	switch (pmf_dev->pmf_if_version) {
569	case PMF_IF_V1:
570		if (!is_apmf_bios_input_notifications_supported(pmf_dev))
571			break;
572		fallthrough;
573	case PMF_IF_V2:
574		acpi_remove_notify_handler(ahandle, ACPI_ALL_NOTIFY,
575					   apmf_event_handlers[pmf_dev->pmf_if_version]);
576		break;
577	default:
578		break;
579	}
580}
581
582int apmf_acpi_init(struct amd_pmf_dev *pmf_dev)
583{
584	int ret;
585
586	ret = apmf_if_verify_interface(pmf_dev);
587	if (ret) {
588		dev_err(pmf_dev->dev, "APMF verify interface failed :%d\n", ret);
589		goto out;
590	}
591
592	ret = apmf_get_system_params(pmf_dev);
593	if (ret) {
594		dev_dbg(pmf_dev->dev, "APMF apmf_get_system_params failed :%d\n", ret);
595		goto out;
596	}
597
598	if (pmf_dev->hb_interval && pmf_dev->pmf_if_version == PMF_IF_V1) {
599		/* send heartbeats only if the interval is not zero */
600		INIT_DELAYED_WORK(&pmf_dev->heart_beat, apmf_sbios_heartbeat_notify);
601		schedule_delayed_work(&pmf_dev->heart_beat, 0);
602	}
603
604out:
605	return ret;
606}