drivers/peci/cpu.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 // Copyright (c) 2021 Intel Corporation
   3
   4 #include <linux/auxiliary_bus.h>
   5 #include <linux/module.h>
   6 #include <linux/peci.h>
   7 #include <linux/peci-cpu.h>
   8 #include <linux/slab.h>
   9
  10 #include "internal.h"
  11
  12 /**
  13  * peci_temp_read() - read the maximum die temperature from PECI target device
  14  * @device: PECI device to which request is going to be sent
  15  * @temp_raw: where to store the read temperature
  16  *
  17  * It uses GetTemp PECI command.
  18  *
  19  * Return: 0 if succeeded, other values in case errors.
  20  */
  21 int peci_temp_read(struct peci_device *device, s16 *temp_raw)
  22 {
  23         struct peci_request *req;
  24
  25         req = peci_xfer_get_temp(device);
  26         if (IS_ERR(req))
  27                 return PTR_ERR(req);
  28
  29         *temp_raw = peci_request_temp_read(req);
  30
  31         peci_request_free(req);
  32
  33         return 0;
  34 }
  35 EXPORT_SYMBOL_NS_GPL(peci_temp_read, "PECI_CPU");
  36
  37 /**
  38  * peci_pcs_read() - read PCS register
  39  * @device: PECI device to which request is going to be sent
  40  * @index: PCS index
  41  * @param: PCS parameter
  42  * @data: where to store the read data
  43  *
  44  * It uses RdPkgConfig PECI command.
  45  *
  46  * Return: 0 if succeeded, other values in case errors.
  47  */
  48 int peci_pcs_read(struct peci_device *device, u8 index, u16 param, u32 *data)
  49 {
  50         struct peci_request *req;
  51         int ret;
  52
  53         req = peci_xfer_pkg_cfg_readl(device, index, param);
  54         if (IS_ERR(req))
  55                 return PTR_ERR(req);
  56
  57         ret = peci_request_status(req);
  58         if (ret)
  59                 goto out_req_free;
  60
  61         *data = peci_request_data_readl(req);
  62 out_req_free:
  63         peci_request_free(req);
  64
  65         return ret;
  66 }
  67 EXPORT_SYMBOL_NS_GPL(peci_pcs_read, "PECI_CPU");
  68
  69 /**
  70  * peci_pci_local_read() - read 32-bit memory location using raw address
  71  * @device: PECI device to which request is going to be sent
  72  * @bus: bus
  73  * @dev: device
  74  * @func: function
  75  * @reg: register
  76  * @data: where to store the read data
  77  *
  78  * It uses RdPCIConfigLocal PECI command.
  79  *
  80  * Return: 0 if succeeded, other values in case errors.
  81  */
  82 int peci_pci_local_read(struct peci_device *device, u8 bus, u8 dev, u8 func,
  83                         u16 reg, u32 *data)
  84 {
  85         struct peci_request *req;
  86         int ret;
  87
  88         req = peci_xfer_pci_cfg_local_readl(device, bus, dev, func, reg);
  89         if (IS_ERR(req))
  90                 return PTR_ERR(req);
  91
  92         ret = peci_request_status(req);
  93         if (ret)
  94                 goto out_req_free;
  95
  96         *data = peci_request_data_readl(req);
  97 out_req_free:
  98         peci_request_free(req);
  99
 100         return ret;
 101 }
 102 EXPORT_SYMBOL_NS_GPL(peci_pci_local_read, "PECI_CPU");
 103
 104 /**
 105  * peci_ep_pci_local_read() - read 32-bit memory location using raw address
 106  * @device: PECI device to which request is going to be sent
 107  * @seg: PCI segment
 108  * @bus: bus
 109  * @dev: device
 110  * @func: function
 111  * @reg: register
 112  * @data: where to store the read data
 113  *
 114  * Like &peci_pci_local_read, but it uses RdEndpointConfig PECI command.
 115  *
 116  * Return: 0 if succeeded, other values in case errors.
 117  */
 118 int peci_ep_pci_local_read(struct peci_device *device, u8 seg,
 119                            u8 bus, u8 dev, u8 func, u16 reg, u32 *data)
 120 {
 121         struct peci_request *req;
 122         int ret;
 123
 124         req = peci_xfer_ep_pci_cfg_local_readl(device, seg, bus, dev, func, reg);
 125         if (IS_ERR(req))
 126                 return PTR_ERR(req);
 127
 128         ret = peci_request_status(req);
 129         if (ret)
 130                 goto out_req_free;
 131
 132         *data = peci_request_data_readl(req);
 133 out_req_free:
 134         peci_request_free(req);
 135
 136         return ret;
 137 }
 138 EXPORT_SYMBOL_NS_GPL(peci_ep_pci_local_read, "PECI_CPU");
 139
 140 /**
 141  * peci_mmio_read() - read 32-bit memory location using 64-bit bar offset address
 142  * @device: PECI device to which request is going to be sent
 143  * @bar: PCI bar
 144  * @seg: PCI segment
 145  * @bus: bus
 146  * @dev: device
 147  * @func: function
 148  * @address: 64-bit MMIO address
 149  * @data: where to store the read data
 150  *
 151  * It uses RdEndpointConfig PECI command.
 152  *
 153  * Return: 0 if succeeded, other values in case errors.
 154  */
 155 int peci_mmio_read(struct peci_device *device, u8 bar, u8 seg,
 156                    u8 bus, u8 dev, u8 func, u64 address, u32 *data)
 157 {
 158         struct peci_request *req;
 159         int ret;
 160
 161         req = peci_xfer_ep_mmio64_readl(device, bar, seg, bus, dev, func, address);
 162         if (IS_ERR(req))
 163                 return PTR_ERR(req);
 164
 165         ret = peci_request_status(req);
 166         if (ret)
 167                 goto out_req_free;
 168
 169         *data = peci_request_data_readl(req);
 170 out_req_free:
 171         peci_request_free(req);
 172
 173         return ret;
 174 }
 175 EXPORT_SYMBOL_NS_GPL(peci_mmio_read, "PECI_CPU");
 176
 177 static const char * const peci_adev_types[] = {
 178         "cputemp",
 179         "dimmtemp",
 180 };
 181
 182 struct peci_cpu {
 183         struct peci_device *device;
 184         const struct peci_device_id *id;
 185 };
 186
 187 static void adev_release(struct device *dev)
 188 {
 189         struct auxiliary_device *adev = to_auxiliary_dev(dev);
 190
 191         kfree(adev->name);
 192         kfree(adev);
 193 }
 194
 195 static struct auxiliary_device *adev_alloc(struct peci_cpu *priv, int idx)
 196 {
 197         struct peci_controller *controller = to_peci_controller(priv->device->dev.parent);
 198         struct auxiliary_device *adev;
 199         const char *name;
 200         int ret;
 201
 202         adev = kzalloc(sizeof(*adev), GFP_KERNEL);
 203         if (!adev)
 204                 return ERR_PTR(-ENOMEM);
 205
 206         name = kasprintf(GFP_KERNEL, "%s.%s", peci_adev_types[idx], (const char *)priv->id->data);
 207         if (!name) {
 208                 ret = -ENOMEM;
 209                 goto free_adev;
 210         }
 211
 212         adev->name = name;
 213         adev->dev.parent = &priv->device->dev;
 214         adev->dev.release = adev_release;
 215         adev->id = (controller->id << 16) | (priv->device->addr);
 216
 217         ret = auxiliary_device_init(adev);
 218         if (ret)
 219                 goto free_name;
 220
 221         return adev;
 222
 223 free_name:
 224         kfree(name);
 225 free_adev:
 226         kfree(adev);
 227         return ERR_PTR(ret);
 228 }
 229
 230 static void unregister_adev(void *_adev)
 231 {
 232         struct auxiliary_device *adev = _adev;
 233
 234         auxiliary_device_delete(adev);
 235         auxiliary_device_uninit(adev);
 236 }
 237
 238 static int devm_adev_add(struct device *dev, int idx)
 239 {
 240         struct peci_cpu *priv = dev_get_drvdata(dev);
 241         struct auxiliary_device *adev;
 242         int ret;
 243
 244         adev = adev_alloc(priv, idx);
 245         if (IS_ERR(adev))
 246                 return PTR_ERR(adev);
 247
 248         ret = auxiliary_device_add(adev);
 249         if (ret) {
 250                 auxiliary_device_uninit(adev);
 251                 return ret;
 252         }
 253
 254         ret = devm_add_action_or_reset(&priv->device->dev, unregister_adev, adev);
 255         if (ret)
 256                 return ret;
 257
 258         return 0;
 259 }
 260
 261 static void peci_cpu_add_adevices(struct peci_cpu *priv)
 262 {
 263         struct device *dev = &priv->device->dev;
 264         int ret, i;
 265
 266         for (i = 0; i < ARRAY_SIZE(peci_adev_types); i++) {
 267                 ret = devm_adev_add(dev, i);
 268                 if (ret) {
 269                         dev_warn(dev, "Failed to register PECI auxiliary: %s, ret = %d\n",
 270                                  peci_adev_types[i], ret);
 271                         continue;
 272                 }
 273         }
 274 }
 275
 276 static int
 277 peci_cpu_probe(struct peci_device *device, const struct peci_device_id *id)
 278 {
 279         struct device *dev = &device->dev;
 280         struct peci_cpu *priv;
 281
 282         priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
 283         if (!priv)
 284                 return -ENOMEM;
 285
 286         dev_set_drvdata(dev, priv);
 287         priv->device = device;
 288         priv->id = id;
 289
 290         peci_cpu_add_adevices(priv);
 291
 292         return 0;
 293 }
 294
 295 static const struct peci_device_id peci_cpu_device_ids[] = {
 296         { /* Haswell Xeon */
 297                 .x86_vfm = INTEL_HASWELL_X,
 298                 .data   = "hsx",
 299         },
 300         { /* Broadwell Xeon */
 301                 .x86_vfm = INTEL_BROADWELL_X,
 302                 .data   = "bdx",
 303         },
 304         { /* Broadwell Xeon D */
 305                 .x86_vfm = INTEL_BROADWELL_D,
 306                 .data   = "bdxd",
 307         },
 308         { /* Skylake Xeon */
 309                 .x86_vfm = INTEL_SKYLAKE_X,
 310                 .data   = "skx",
 311         },
 312         { /* Icelake Xeon */
 313                 .x86_vfm = INTEL_ICELAKE_X,
 314                 .data   = "icx",
 315         },
 316         { /* Icelake Xeon D */
 317                 .x86_vfm = INTEL_ICELAKE_D,
 318                 .data   = "icxd",
 319         },
 320         { /* Sapphire Rapids Xeon */
 321                 .x86_vfm = INTEL_SAPPHIRERAPIDS_X,
 322                 .data   = "spr",
 323         },
 324         { }
 325 };
 326 MODULE_DEVICE_TABLE(peci, peci_cpu_device_ids);
 327
 328 static struct peci_driver peci_cpu_driver = {
 329         .probe          = peci_cpu_probe,
 330         .id_table       = peci_cpu_device_ids,
 331         .driver         = {
 332                 .name           = "peci-cpu",
 333         },
 334 };
 335 module_peci_driver(peci_cpu_driver);
 336
 337 MODULE_AUTHOR("Iwona Winiarska <iwona.winiarska@intel.com>");
 338 MODULE_DESCRIPTION("PECI CPU driver");
 339 MODULE_LICENSE("GPL");
 340 MODULE_IMPORT_NS("PECI");