xref: /linux/drivers/platform/x86/amd/pmf/acpi.c (revision 023a25b071a2d28f8eb8ba46da14f275c92d38d1) 
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 
17 static 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 
50 static 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 
88 out:
89 	kfree(info);
90 	return err;
91 }
92 
93 static 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 
121 static 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);
153 out:
154 	kfree(info);
155 	return err;
156 }
157 
158 int 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 
164 int 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 
173 int 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 
183 int 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 
193 int 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 
213 static 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 
227 int 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 
264 int 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 
285 static int apmf_notify_smart_pc_update(struct amd_pmf_dev *pdev, u32 val, u32 preq, u32 index)
286 {
287 	struct amd_pmf_notify_smart_pc_update args;
288 	struct acpi_buffer params;
289 	union acpi_object *info;
290 
291 	args.size = sizeof(args);
292 	args.pending_req = preq;
293 	args.custom_bios[index] = val;
294 
295 	params.length = sizeof(args);
296 	params.pointer = &args;
297 
298 	info = apmf_if_call(pdev, APMF_FUNC_NOTIFY_SMART_PC_UPDATES, &params);
299 	if (!info)
300 		return -EIO;
301 
302 	kfree(info);
303 	dev_dbg(pdev->dev, "Notify smart pc update, val: %u\n", val);
304 
305 	return 0;
306 }
307 
308 int apmf_get_auto_mode_def(struct amd_pmf_dev *pdev, struct apmf_auto_mode *data)
309 {
310 	return apmf_if_call_store_buffer(pdev, APMF_FUNC_AUTO_MODE, data, sizeof(*data));
311 }
312 
313 int apmf_get_sbios_requests_v2(struct amd_pmf_dev *pdev, struct apmf_sbios_req_v2 *req)
314 {
315 	return apmf_if_call_store_buffer(pdev, APMF_FUNC_SBIOS_REQUESTS, req, sizeof(*req));
316 }
317 
318 int apmf_get_sbios_requests(struct amd_pmf_dev *pdev, struct apmf_sbios_req *req)
319 {
320 	return apmf_if_call_store_buffer(pdev, APMF_FUNC_SBIOS_REQUESTS,
321 									 req, sizeof(*req));
322 }
323 
324 static void apmf_event_handler(acpi_handle handle, u32 event, void *data)
325 {
326 	struct amd_pmf_dev *pmf_dev = data;
327 	struct apmf_sbios_req req;
328 	int ret;
329 
330 	mutex_lock(&pmf_dev->update_mutex);
331 	ret = apmf_get_sbios_requests(pmf_dev, &req);
332 	if (ret) {
333 		dev_err(pmf_dev->dev, "Failed to get SBIOS requests:%d\n", ret);
334 		goto out;
335 	}
336 
337 	if (req.pending_req & BIT(APMF_AMT_NOTIFICATION)) {
338 		dev_dbg(pmf_dev->dev, "AMT is supported and notifications %s\n",
339 			req.amt_event ? "Enabled" : "Disabled");
340 		pmf_dev->amt_enabled = !!req.amt_event;
341 
342 		if (pmf_dev->amt_enabled)
343 			amd_pmf_handle_amt(pmf_dev);
344 		else
345 			amd_pmf_reset_amt(pmf_dev);
346 	}
347 
348 	if (req.pending_req & BIT(APMF_CQL_NOTIFICATION)) {
349 		dev_dbg(pmf_dev->dev, "CQL is supported and notifications %s\n",
350 			req.cql_event ? "Enabled" : "Disabled");
351 
352 		/* update the target mode information */
353 		if (pmf_dev->amt_enabled)
354 			amd_pmf_update_2_cql(pmf_dev, req.cql_event);
355 	}
356 out:
357 	mutex_unlock(&pmf_dev->update_mutex);
358 }
359 
360 static int apmf_if_verify_interface(struct amd_pmf_dev *pdev)
361 {
362 	struct apmf_verify_interface output;
363 	int err;
364 
365 	err = apmf_if_call_store_buffer(pdev, APMF_FUNC_VERIFY_INTERFACE, &output, sizeof(output));
366 	if (err)
367 		return err;
368 
369 	/* only set if not already set by a quirk */
370 	if (!pdev->supported_func)
371 		pdev->supported_func = output.supported_functions;
372 
373 	dev_dbg(pdev->dev, "supported functions:0x%x notifications:0x%x version:%u\n",
374 		output.supported_functions, output.notification_mask, output.version);
375 
376 	pdev->pmf_if_version = output.version;
377 
378 	return 0;
379 }
380 
381 static int apmf_get_system_params(struct amd_pmf_dev *dev)
382 {
383 	struct apmf_system_params params;
384 	int err;
385 
386 	if (!is_apmf_func_supported(dev, APMF_FUNC_GET_SYS_PARAMS))
387 		return -EINVAL;
388 
389 	err = apmf_if_call_store_buffer(dev, APMF_FUNC_GET_SYS_PARAMS, &params, sizeof(params));
390 	if (err)
391 		return err;
392 
393 	dev_dbg(dev->dev, "system params mask:0x%x flags:0x%x cmd_code:0x%x heartbeat:%d\n",
394 		params.valid_mask,
395 		params.flags,
396 		params.command_code,
397 		params.heartbeat_int);
398 	params.flags = params.flags & params.valid_mask;
399 	dev->hb_interval = params.heartbeat_int;
400 
401 	return 0;
402 }
403 
404 int apmf_get_dyn_slider_def_ac(struct amd_pmf_dev *pdev, struct apmf_dyn_slider_output *data)
405 {
406 	return apmf_if_call_store_buffer(pdev, APMF_FUNC_DYN_SLIDER_AC, data, sizeof(*data));
407 }
408 
409 int apmf_get_dyn_slider_def_dc(struct amd_pmf_dev *pdev, struct apmf_dyn_slider_output *data)
410 {
411 	return apmf_if_call_store_buffer(pdev, APMF_FUNC_DYN_SLIDER_DC, data, sizeof(*data));
412 }
413 
414 int apmf_install_handler(struct amd_pmf_dev *pmf_dev)
415 {
416 	acpi_handle ahandle = ACPI_HANDLE(pmf_dev->dev);
417 	acpi_status status;
418 
419 	/* Install the APMF Notify handler */
420 	if (is_apmf_func_supported(pmf_dev, APMF_FUNC_AUTO_MODE) &&
421 	    is_apmf_func_supported(pmf_dev, APMF_FUNC_SBIOS_REQUESTS)) {
422 		status = acpi_install_notify_handler(ahandle, ACPI_ALL_NOTIFY,
423 						     apmf_event_handler, pmf_dev);
424 		if (ACPI_FAILURE(status)) {
425 			dev_err(pmf_dev->dev, "failed to install notify handler\n");
426 			return -ENODEV;
427 		}
428 
429 		/* Call the handler once manually to catch up with possibly missed notifies. */
430 		apmf_event_handler(ahandle, 0, pmf_dev);
431 	}
432 
433 	return 0;
434 }
435 
436 static acpi_status apmf_walk_resources(struct acpi_resource *res, void *data)
437 {
438 	struct amd_pmf_dev *dev = data;
439 
440 	switch (res->type) {
441 	case ACPI_RESOURCE_TYPE_ADDRESS64:
442 		dev->policy_addr = res->data.address64.address.minimum;
443 		dev->policy_sz = res->data.address64.address.address_length;
444 		break;
445 	case ACPI_RESOURCE_TYPE_FIXED_MEMORY32:
446 		dev->policy_addr = res->data.fixed_memory32.address;
447 		dev->policy_sz = res->data.fixed_memory32.address_length;
448 		break;
449 	}
450 
451 	if (!dev->policy_addr || dev->policy_sz > POLICY_BUF_MAX_SZ || dev->policy_sz == 0) {
452 		pr_err("Incorrect Policy params, possibly a SBIOS bug\n");
453 		return AE_ERROR;
454 	}
455 
456 	return AE_OK;
457 }
458 
459 int apmf_check_smart_pc(struct amd_pmf_dev *pmf_dev)
460 {
461 	acpi_handle ahandle = ACPI_HANDLE(pmf_dev->dev);
462 	acpi_status status;
463 
464 	status = acpi_walk_resources(ahandle, METHOD_NAME__CRS, apmf_walk_resources, pmf_dev);
465 	if (ACPI_FAILURE(status)) {
466 		dev_dbg(pmf_dev->dev, "acpi_walk_resources failed :%d\n", status);
467 		return -EINVAL;
468 	}
469 
470 	return 0;
471 }
472 
473 int amd_pmf_smartpc_apply_bios_output(struct amd_pmf_dev *dev, u32 val, u32 preq, u32 idx)
474 {
475 	if (!is_apmf_func_supported(dev, APMF_FUNC_NOTIFY_SMART_PC_UPDATES))
476 		return -EINVAL;
477 
478 	return apmf_notify_smart_pc_update(dev, val, preq, idx);
479 }
480 
481 void apmf_acpi_deinit(struct amd_pmf_dev *pmf_dev)
482 {
483 	acpi_handle ahandle = ACPI_HANDLE(pmf_dev->dev);
484 
485 	if (pmf_dev->hb_interval && pmf_dev->pmf_if_version == PMF_IF_V1)
486 		cancel_delayed_work_sync(&pmf_dev->heart_beat);
487 
488 	if (is_apmf_func_supported(pmf_dev, APMF_FUNC_AUTO_MODE) &&
489 	    is_apmf_func_supported(pmf_dev, APMF_FUNC_SBIOS_REQUESTS))
490 		acpi_remove_notify_handler(ahandle, ACPI_ALL_NOTIFY, apmf_event_handler);
491 }
492 
493 int apmf_acpi_init(struct amd_pmf_dev *pmf_dev)
494 {
495 	int ret;
496 
497 	ret = apmf_if_verify_interface(pmf_dev);
498 	if (ret) {
499 		dev_err(pmf_dev->dev, "APMF verify interface failed :%d\n", ret);
500 		goto out;
501 	}
502 
503 	ret = apmf_get_system_params(pmf_dev);
504 	if (ret) {
505 		dev_dbg(pmf_dev->dev, "APMF apmf_get_system_params failed :%d\n", ret);
506 		goto out;
507 	}
508 
509 	if (pmf_dev->hb_interval && pmf_dev->pmf_if_version == PMF_IF_V1) {
510 		/* send heartbeats only if the interval is not zero */
511 		INIT_DELAYED_WORK(&pmf_dev->heart_beat, apmf_sbios_heartbeat_notify);
512 		schedule_delayed_work(&pmf_dev->heart_beat, 0);
513 	}
514 
515 out:
516 	return ret;
517 }
518