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
apmf_if_call(struct amd_pmf_dev * pdev,int fn,struct acpi_buffer * param)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
apmf_if_call_store_buffer(struct amd_pmf_dev * pdev,int fn,void * dest,size_t out_sz)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
is_apmf_func_supported(struct amd_pmf_dev * pdev,unsigned long index)93 int 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
apmf_get_static_slider_granular(struct amd_pmf_dev * pdev,struct apmf_static_slider_granular_output * data)99 int 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
apmf_os_power_slider_update(struct amd_pmf_dev * pdev,u8 event)109 int 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, ¶ms);
123 if (!info)
124 err = -EIO;
125
126 kfree(info);
127 return err;
128 }
129
apmf_sbios_heartbeat_notify(struct work_struct * work)130 static 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
142 out:
143 kfree(info);
144 }
145
apmf_update_fan_idx(struct amd_pmf_dev * pdev,bool manual,u32 idx)146 int 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, ¶ms);
161 if (!info) {
162 err = -EIO;
163 goto out;
164 }
165
166 out:
167 kfree(info);
168 return err;
169 }
170
apmf_get_auto_mode_def(struct amd_pmf_dev * pdev,struct apmf_auto_mode * data)171 int 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
apmf_get_sbios_requests(struct amd_pmf_dev * pdev,struct apmf_sbios_req * req)176 int 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
apmf_event_handler(acpi_handle handle,u32 event,void * data)182 static 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 }
214 out:
215 mutex_unlock(&pmf_dev->update_mutex);
216 }
217
apmf_if_verify_interface(struct amd_pmf_dev * pdev)218 static 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
apmf_get_system_params(struct amd_pmf_dev * dev)234 static 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, ¶ms, 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
apmf_get_dyn_slider_def_ac(struct amd_pmf_dev * pdev,struct apmf_dyn_slider_output * data)257 int 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
apmf_get_dyn_slider_def_dc(struct amd_pmf_dev * pdev,struct apmf_dyn_slider_output * data)262 int 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
apmf_install_handler(struct amd_pmf_dev * pmf_dev)267 int 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
apmf_acpi_deinit(struct amd_pmf_dev * pmf_dev)289 void 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
apmf_acpi_init(struct amd_pmf_dev * pmf_dev)301 int 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
323 out:
324 return ret;
325 }
326