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
93int is_apmf_func_supported(struct amd_pmf_dev *pdev, unsigned long index)
94{
95	/* If bit-n is set, that indicates function n+1 is supported */
96	return !!(pdev->supported_func & BIT(index - 1));
97}
98
99int apmf_get_static_slider_granular(struct amd_pmf_dev *pdev,
100				    struct apmf_static_slider_granular_output *data)
101{
102	if (!is_apmf_func_supported(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR))
103		return -EINVAL;
104
105	return apmf_if_call_store_buffer(pdev, APMF_FUNC_STATIC_SLIDER_GRANULAR,
106									 data, sizeof(*data));
107}
108
109int apmf_os_power_slider_update(struct amd_pmf_dev *pdev, u8 event)
110{
111	struct os_power_slider args;
112	struct acpi_buffer params;
113	union acpi_object *info;
114	int err = 0;
115
116	args.size = sizeof(args);
117	args.slider_event = event;
118
119	params.length = sizeof(args);
120	params.pointer = (void *)&args;
121
122	info = apmf_if_call(pdev, APMF_FUNC_OS_POWER_SLIDER_UPDATE, &params);
123	if (!info)
124		err = -EIO;
125
126	kfree(info);
127	return err;
128}
129
130static void apmf_sbios_heartbeat_notify(struct work_struct *work)
131{
132	struct amd_pmf_dev *dev = container_of(work, struct amd_pmf_dev, heart_beat.work);
133	union acpi_object *info;
134
135	dev_dbg(dev->dev, "Sending heartbeat to SBIOS\n");
136	info = apmf_if_call(dev, APMF_FUNC_SBIOS_HEARTBEAT, NULL);
137	if (!info)
138		goto out;
139
140	schedule_delayed_work(&dev->heart_beat, msecs_to_jiffies(dev->hb_interval * 1000));
141
142out:
143	kfree(info);
144}
145
146int apmf_update_fan_idx(struct amd_pmf_dev *pdev, bool manual, u32 idx)
147{
148	union acpi_object *info;
149	struct apmf_fan_idx args;
150	struct acpi_buffer params;
151	int err = 0;
152
153	args.size = sizeof(args);
154	args.fan_ctl_mode = manual;
155	args.fan_ctl_idx = idx;
156
157	params.length = sizeof(args);
158	params.pointer = (void *)&args;
159
160	info = apmf_if_call(pdev, APMF_FUNC_SET_FAN_IDX, &params);
161	if (!info) {
162		err = -EIO;
163		goto out;
164	}
165
166out:
167	kfree(info);
168	return err;
169}
170
171int apmf_get_auto_mode_def(struct amd_pmf_dev *pdev, struct apmf_auto_mode *data)
172{
173	return apmf_if_call_store_buffer(pdev, APMF_FUNC_AUTO_MODE, data, sizeof(*data));
174}
175
176int apmf_get_sbios_requests(struct amd_pmf_dev *pdev, struct apmf_sbios_req *req)
177{
178	return apmf_if_call_store_buffer(pdev, APMF_FUNC_SBIOS_REQUESTS,
179									 req, sizeof(*req));
180}
181
182static void apmf_event_handler(acpi_handle handle, u32 event, void *data)
183{
184	struct amd_pmf_dev *pmf_dev = data;
185	struct apmf_sbios_req req;
186	int ret;
187
188	mutex_lock(&pmf_dev->update_mutex);
189	ret = apmf_get_sbios_requests(pmf_dev, &req);
190	if (ret) {
191		dev_err(pmf_dev->dev, "Failed to get SBIOS requests:%d\n", ret);
192		goto out;
193	}
194
195	if (req.pending_req & BIT(APMF_AMT_NOTIFICATION)) {
196		dev_dbg(pmf_dev->dev, "AMT is supported and notifications %s\n",
197			req.amt_event ? "Enabled" : "Disabled");
198		pmf_dev->amt_enabled = !!req.amt_event;
199
200		if (pmf_dev->amt_enabled)
201			amd_pmf_handle_amt(pmf_dev);
202		else
203			amd_pmf_reset_amt(pmf_dev);
204	}
205
206	if (req.pending_req & BIT(APMF_CQL_NOTIFICATION)) {
207		dev_dbg(pmf_dev->dev, "CQL is supported and notifications %s\n",
208			req.cql_event ? "Enabled" : "Disabled");
209
210		/* update the target mode information */
211		if (pmf_dev->amt_enabled)
212			amd_pmf_update_2_cql(pmf_dev, req.cql_event);
213	}
214out:
215	mutex_unlock(&pmf_dev->update_mutex);
216}
217
218static int apmf_if_verify_interface(struct amd_pmf_dev *pdev)
219{
220	struct apmf_verify_interface output;
221	int err;
222
223	err = apmf_if_call_store_buffer(pdev, APMF_FUNC_VERIFY_INTERFACE, &output, sizeof(output));
224	if (err)
225		return err;
226
227	pdev->supported_func = output.supported_functions;
228	dev_dbg(pdev->dev, "supported functions:0x%x notifications:0x%x\n",
229		output.supported_functions, output.notification_mask);
230
231	return 0;
232}
233
234static int apmf_get_system_params(struct amd_pmf_dev *dev)
235{
236	struct apmf_system_params params;
237	int err;
238
239	if (!is_apmf_func_supported(dev, APMF_FUNC_GET_SYS_PARAMS))
240		return -EINVAL;
241
242	err = apmf_if_call_store_buffer(dev, APMF_FUNC_GET_SYS_PARAMS, &params, sizeof(params));
243	if (err)
244		return err;
245
246	dev_dbg(dev->dev, "system params mask:0x%x flags:0x%x cmd_code:0x%x heartbeat:%d\n",
247		params.valid_mask,
248		params.flags,
249		params.command_code,
250		params.heartbeat_int);
251	params.flags = params.flags & params.valid_mask;
252	dev->hb_interval = params.heartbeat_int;
253
254	return 0;
255}
256
257int apmf_get_dyn_slider_def_ac(struct amd_pmf_dev *pdev, struct apmf_dyn_slider_output *data)
258{
259	return apmf_if_call_store_buffer(pdev, APMF_FUNC_DYN_SLIDER_AC, data, sizeof(*data));
260}
261
262int apmf_get_dyn_slider_def_dc(struct amd_pmf_dev *pdev, struct apmf_dyn_slider_output *data)
263{
264	return apmf_if_call_store_buffer(pdev, APMF_FUNC_DYN_SLIDER_DC, data, sizeof(*data));
265}
266
267int apmf_install_handler(struct amd_pmf_dev *pmf_dev)
268{
269	acpi_handle ahandle = ACPI_HANDLE(pmf_dev->dev);
270	acpi_status status;
271
272	/* Install the APMF Notify handler */
273	if (is_apmf_func_supported(pmf_dev, APMF_FUNC_AUTO_MODE) &&
274	    is_apmf_func_supported(pmf_dev, APMF_FUNC_SBIOS_REQUESTS)) {
275		status = acpi_install_notify_handler(ahandle, ACPI_ALL_NOTIFY,
276						     apmf_event_handler, pmf_dev);
277		if (ACPI_FAILURE(status)) {
278			dev_err(pmf_dev->dev, "failed to install notify handler\n");
279			return -ENODEV;
280		}
281
282		/* Call the handler once manually to catch up with possibly missed notifies. */
283		apmf_event_handler(ahandle, 0, pmf_dev);
284	}
285
286	return 0;
287}
288
289void apmf_acpi_deinit(struct amd_pmf_dev *pmf_dev)
290{
291	acpi_handle ahandle = ACPI_HANDLE(pmf_dev->dev);
292
293	if (pmf_dev->hb_interval)
294		cancel_delayed_work_sync(&pmf_dev->heart_beat);
295
296	if (is_apmf_func_supported(pmf_dev, APMF_FUNC_AUTO_MODE) &&
297	    is_apmf_func_supported(pmf_dev, APMF_FUNC_SBIOS_REQUESTS))
298		acpi_remove_notify_handler(ahandle, ACPI_ALL_NOTIFY, apmf_event_handler);
299}
300
301int apmf_acpi_init(struct amd_pmf_dev *pmf_dev)
302{
303	int ret;
304
305	ret = apmf_if_verify_interface(pmf_dev);
306	if (ret) {
307		dev_err(pmf_dev->dev, "APMF verify interface failed :%d\n", ret);
308		goto out;
309	}
310
311	ret = apmf_get_system_params(pmf_dev);
312	if (ret) {
313		dev_dbg(pmf_dev->dev, "APMF apmf_get_system_params failed :%d\n", ret);
314		goto out;
315	}
316
317	if (pmf_dev->hb_interval) {
318		/* send heartbeats only if the interval is not zero */
319		INIT_DELAYED_WORK(&pmf_dev->heart_beat, apmf_sbios_heartbeat_notify);
320		schedule_delayed_work(&pmf_dev->heart_beat, 0);
321	}
322
323out:
324	return ret;
325}
326