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 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 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 } 108 109 static 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)); 120 121 out: 122 kfree(info); 123 } 124 125 int 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 } 144 145 out: 146 kfree(info); 147 return err; 148 } 149 150 int 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 } 154 155 int 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 } 160 161 static 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 } 193 out: 194 mutex_unlock(&pmf_dev->update_mutex); 195 } 196 197 static 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 } 212 213 static 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 } 235 236 int 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 } 240 241 int 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 } 245 246 int 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 } 267 268 void 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 } 279 280 int 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 } 301 302 out: 303 return ret; 304 } 305