drivers/platform/x86/amd/pmf/acpi.c

   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 <[email protected]>
   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, &params);
 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, &params, 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 }