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 .family = 6, 298 .model = INTEL_FAM6_HASWELL_X, 299 .data = "hsx", 300 }, 301 { /* Broadwell Xeon */ 302 .family = 6, 303 .model = INTEL_FAM6_BROADWELL_X, 304 .data = "bdx", 305 }, 306 { /* Broadwell Xeon D */ 307 .family = 6, 308 .model = INTEL_FAM6_BROADWELL_D, 309 .data = "bdxd", 310 }, 311 { /* Skylake Xeon */ 312 .family = 6, 313 .model = INTEL_FAM6_SKYLAKE_X, 314 .data = "skx", 315 }, 316 { /* Icelake Xeon */ 317 .family = 6, 318 .model = INTEL_FAM6_ICELAKE_X, 319 .data = "icx", 320 }, 321 { /* Icelake Xeon D */ 322 .family = 6, 323 .model = INTEL_FAM6_ICELAKE_D, 324 .data = "icxd", 325 }, 326 { } 327 }; 328 MODULE_DEVICE_TABLE(peci, peci_cpu_device_ids); 329 330 static struct peci_driver peci_cpu_driver = { 331 .probe = peci_cpu_probe, 332 .id_table = peci_cpu_device_ids, 333 .driver = { 334 .name = "peci-cpu", 335 }, 336 }; 337 module_peci_driver(peci_cpu_driver); 338 339 MODULE_AUTHOR("Iwona Winiarska <iwona.winiarska@intel.com>"); 340 MODULE_DESCRIPTION("PECI CPU driver"); 341 MODULE_LICENSE("GPL"); 342 MODULE_IMPORT_NS(PECI); 343