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 apts_get_static_slider_granular_v2(struct amd_pmf_dev *pdev,
165				       struct amd_pmf_apts_granular_output *data, u32 apts_idx)
166{
167	if (!is_apmf_func_supported(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR))
168		return -EINVAL;
169
170	return apts_if_call_store_buffer(pdev, apts_idx, data, sizeof(*data));
171}
172
173int apmf_get_static_slider_granular_v2(struct amd_pmf_dev *pdev,
174				       struct apmf_static_slider_granular_output_v2 *data)
175{
176	if (!is_apmf_func_supported(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR))
177		return -EINVAL;
178
179	return apmf_if_call_store_buffer(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR,
180					 data, sizeof(*data));
181}
182
183int apmf_get_static_slider_granular(struct amd_pmf_dev *pdev,
184				    struct apmf_static_slider_granular_output *data)
185{
186	if (!is_apmf_func_supported(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR))
187		return -EINVAL;
188
189	return apmf_if_call_store_buffer(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR,
190									 data, sizeof(*data));
191}
192
193int apmf_os_power_slider_update(struct amd_pmf_dev *pdev, u8 event)
194{
195	struct os_power_slider args;
196	struct acpi_buffer params;
197	union acpi_object *info;
198
199	args.size = sizeof(args);
200	args.slider_event = event;
201
202	params.length = sizeof(args);
203	params.pointer = (void *)&args;
204
205	info = apmf_if_call(pdev, APMF_FUNC_OS_POWER_SLIDER_UPDATE, &params);
206	if (!info)
207		return -EIO;
208
209	kfree(info);
210	return 0;
211}
212
213static void apmf_sbios_heartbeat_notify(struct work_struct *work)
214{
215	struct amd_pmf_dev *dev = container_of(work, struct amd_pmf_dev, heart_beat.work);
216	union acpi_object *info;
217
218	dev_dbg(dev->dev, "Sending heartbeat to SBIOS\n");
219	info = apmf_if_call(dev, APMF_FUNC_SBIOS_HEARTBEAT, NULL);
220	if (!info)
221		return;
222
223	schedule_delayed_work(&dev->heart_beat, msecs_to_jiffies(dev->hb_interval * 1000));
224	kfree(info);
225}
226
227int amd_pmf_notify_sbios_heartbeat_event_v2(struct amd_pmf_dev *dev, u8 flag)
228{
229	struct sbios_hb_event_v2 args = { };
230	struct acpi_buffer params;
231	union acpi_object *info;
232
233	args.size = sizeof(args);
234
235	switch (flag) {
236	case ON_LOAD:
237		args.load = 1;
238		break;
239	case ON_UNLOAD:
240		args.unload = 1;
241		break;
242	case ON_SUSPEND:
243		args.suspend = 1;
244		break;
245	case ON_RESUME:
246		args.resume = 1;
247		break;
248	default:
249		dev_dbg(dev->dev, "Failed to send v2 heartbeat event, flag:0x%x\n", flag);
250		return -EINVAL;
251	}
252
253	params.length = sizeof(args);
254	params.pointer = &args;
255
256	info = apmf_if_call(dev, APMF_FUNC_SBIOS_HEARTBEAT_V2, &params);
257	if (!info)
258		return -EIO;
259
260	kfree(info);
261	return 0;
262}
263
264int apmf_update_fan_idx(struct amd_pmf_dev *pdev, bool manual, u32 idx)
265{
266	union acpi_object *info;
267	struct apmf_fan_idx args;
268	struct acpi_buffer params;
269
270	args.size = sizeof(args);
271	args.fan_ctl_mode = manual;
272	args.fan_ctl_idx = idx;
273
274	params.length = sizeof(args);
275	params.pointer = (void *)&args;
276
277	info = apmf_if_call(pdev, APMF_FUNC_SET_FAN_IDX, &params);
278	if (!info)
279		return -EIO;
280
281	kfree(info);
282	return 0;
283}
284
285int apmf_get_auto_mode_def(struct amd_pmf_dev *pdev, struct apmf_auto_mode *data)
286{
287	return apmf_if_call_store_buffer(pdev, APMF_FUNC_AUTO_MODE, data, sizeof(*data));
288}
289
290int apmf_get_sbios_requests_v2(struct amd_pmf_dev *pdev, struct apmf_sbios_req_v2 *req)
291{
292	return apmf_if_call_store_buffer(pdev, APMF_FUNC_SBIOS_REQUESTS, req, sizeof(*req));
293}
294
295int apmf_get_sbios_requests(struct amd_pmf_dev *pdev, struct apmf_sbios_req *req)
296{
297	return apmf_if_call_store_buffer(pdev, APMF_FUNC_SBIOS_REQUESTS,
298									 req, sizeof(*req));
299}
300
301static void apmf_event_handler(acpi_handle handle, u32 event, void *data)
302{
303	struct amd_pmf_dev *pmf_dev = data;
304	struct apmf_sbios_req req;
305	int ret;
306
307	mutex_lock(&pmf_dev->update_mutex);
308	ret = apmf_get_sbios_requests(pmf_dev, &req);
309	if (ret) {
310		dev_err(pmf_dev->dev, "Failed to get SBIOS requests:%d\n", ret);
311		goto out;
312	}
313
314	if (req.pending_req & BIT(APMF_AMT_NOTIFICATION)) {
315		dev_dbg(pmf_dev->dev, "AMT is supported and notifications %s\n",
316			req.amt_event ? "Enabled" : "Disabled");
317		pmf_dev->amt_enabled = !!req.amt_event;
318
319		if (pmf_dev->amt_enabled)
320			amd_pmf_handle_amt(pmf_dev);
321		else
322			amd_pmf_reset_amt(pmf_dev);
323	}
324
325	if (req.pending_req & BIT(APMF_CQL_NOTIFICATION)) {
326		dev_dbg(pmf_dev->dev, "CQL is supported and notifications %s\n",
327			req.cql_event ? "Enabled" : "Disabled");
328
329		/* update the target mode information */
330		if (pmf_dev->amt_enabled)
331			amd_pmf_update_2_cql(pmf_dev, req.cql_event);
332	}
333out:
334	mutex_unlock(&pmf_dev->update_mutex);
335}
336
337static int apmf_if_verify_interface(struct amd_pmf_dev *pdev)
338{
339	struct apmf_verify_interface output;
340	int err;
341
342	err = apmf_if_call_store_buffer(pdev, APMF_FUNC_VERIFY_INTERFACE, &output, sizeof(output));
343	if (err)
344		return err;
345
346	/* only set if not already set by a quirk */
347	if (!pdev->supported_func)
348		pdev->supported_func = output.supported_functions;
349
350	dev_dbg(pdev->dev, "supported functions:0x%x notifications:0x%x version:%u\n",
351		output.supported_functions, output.notification_mask, output.version);
352
353	pdev->pmf_if_version = output.version;
354
355	return 0;
356}
357
358static int apmf_get_system_params(struct amd_pmf_dev *dev)
359{
360	struct apmf_system_params params;
361	int err;
362
363	if (!is_apmf_func_supported(dev, APMF_FUNC_GET_SYS_PARAMS))
364		return -EINVAL;
365
366	err = apmf_if_call_store_buffer(dev, APMF_FUNC_GET_SYS_PARAMS, &params, sizeof(params));
367	if (err)
368		return err;
369
370	dev_dbg(dev->dev, "system params mask:0x%x flags:0x%x cmd_code:0x%x heartbeat:%d\n",
371		params.valid_mask,
372		params.flags,
373		params.command_code,
374		params.heartbeat_int);
375	params.flags = params.flags & params.valid_mask;
376	dev->hb_interval = params.heartbeat_int;
377
378	return 0;
379}
380
381int apmf_get_dyn_slider_def_ac(struct amd_pmf_dev *pdev, struct apmf_dyn_slider_output *data)
382{
383	return apmf_if_call_store_buffer(pdev, APMF_FUNC_DYN_SLIDER_AC, data, sizeof(*data));
384}
385
386int apmf_get_dyn_slider_def_dc(struct amd_pmf_dev *pdev, struct apmf_dyn_slider_output *data)
387{
388	return apmf_if_call_store_buffer(pdev, APMF_FUNC_DYN_SLIDER_DC, data, sizeof(*data));
389}
390
391int apmf_install_handler(struct amd_pmf_dev *pmf_dev)
392{
393	acpi_handle ahandle = ACPI_HANDLE(pmf_dev->dev);
394	acpi_status status;
395
396	/* Install the APMF Notify handler */
397	if (is_apmf_func_supported(pmf_dev, APMF_FUNC_AUTO_MODE) &&
398	    is_apmf_func_supported(pmf_dev, APMF_FUNC_SBIOS_REQUESTS)) {
399		status = acpi_install_notify_handler(ahandle, ACPI_ALL_NOTIFY,
400						     apmf_event_handler, pmf_dev);
401		if (ACPI_FAILURE(status)) {
402			dev_err(pmf_dev->dev, "failed to install notify handler\n");
403			return -ENODEV;
404		}
405
406		/* Call the handler once manually to catch up with possibly missed notifies. */
407		apmf_event_handler(ahandle, 0, pmf_dev);
408	}
409
410	return 0;
411}
412
413static acpi_status apmf_walk_resources(struct acpi_resource *res, void *data)
414{
415	struct amd_pmf_dev *dev = data;
416
417	switch (res->type) {
418	case ACPI_RESOURCE_TYPE_ADDRESS64:
419		dev->policy_addr = res->data.address64.address.minimum;
420		dev->policy_sz = res->data.address64.address.address_length;
421		break;
422	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
423		dev->policy_addr = res->data.fixed_memory32.address;
424		dev->policy_sz = res->data.fixed_memory32.address_length;
425		break;
426	}
427
428	if (!dev->policy_addr || dev->policy_sz > POLICY_BUF_MAX_SZ || dev->policy_sz == 0) {
429		pr_err("Incorrect Policy params, possibly a SBIOS bug\n");
430		return AE_ERROR;
431	}
432
433	return AE_OK;
434}
435
436int apmf_check_smart_pc(struct amd_pmf_dev *pmf_dev)
437{
438	acpi_handle ahandle = ACPI_HANDLE(pmf_dev->dev);
439	acpi_status status;
440
441	status = acpi_walk_resources(ahandle, METHOD_NAME__CRS, apmf_walk_resources, pmf_dev);
442	if (ACPI_FAILURE(status)) {
443		dev_dbg(pmf_dev->dev, "acpi_walk_resources failed :%d\n", status);
444		return -EINVAL;
445	}
446
447	return 0;
448}
449
450void apmf_acpi_deinit(struct amd_pmf_dev *pmf_dev)
451{
452	acpi_handle ahandle = ACPI_HANDLE(pmf_dev->dev);
453
454	if (pmf_dev->hb_interval && pmf_dev->pmf_if_version == PMF_IF_V1)
455		cancel_delayed_work_sync(&pmf_dev->heart_beat);
456
457	if (is_apmf_func_supported(pmf_dev, APMF_FUNC_AUTO_MODE) &&
458	    is_apmf_func_supported(pmf_dev, APMF_FUNC_SBIOS_REQUESTS))
459		acpi_remove_notify_handler(ahandle, ACPI_ALL_NOTIFY, apmf_event_handler);
460}
461
462int apmf_acpi_init(struct amd_pmf_dev *pmf_dev)
463{
464	int ret;
465
466	ret = apmf_if_verify_interface(pmf_dev);
467	if (ret) {
468		dev_err(pmf_dev->dev, "APMF verify interface failed :%d\n", ret);
469		goto out;
470	}
471
472	ret = apmf_get_system_params(pmf_dev);
473	if (ret) {
474		dev_dbg(pmf_dev->dev, "APMF apmf_get_system_params failed :%d\n", ret);
475		goto out;
476	}
477
478	if (pmf_dev->hb_interval && pmf_dev->pmf_if_version == PMF_IF_V1) {
479		/* send heartbeats only if the interval is not zero */
480		INIT_DELAYED_WORK(&pmf_dev->heart_beat, apmf_sbios_heartbeat_notify);
481		schedule_delayed_work(&pmf_dev->heart_beat, 0);
482	}
483
484out:
485	return ret;
486}
487