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