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path: root/drivers/peci/cpu.c
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Diffstat (limited to 'drivers/peci/cpu.c')
-rw-r--r--drivers/peci/cpu.c343
1 files changed, 343 insertions, 0 deletions
diff --git a/drivers/peci/cpu.c b/drivers/peci/cpu.c
new file mode 100644
index 000000000000..68eb61c65d34
--- /dev/null
+++ b/drivers/peci/cpu.c
@@ -0,0 +1,343 @@
+// SPDX-License-Identifier: GPL-2.0-only
+// Copyright (c) 2021 Intel Corporation
+
+#include <linux/auxiliary_bus.h>
+#include <linux/module.h>
+#include <linux/peci.h>
+#include <linux/peci-cpu.h>
+#include <linux/slab.h>
+
+#include "internal.h"
+
+/**
+ * peci_temp_read() - read the maximum die temperature from PECI target device
+ * @device: PECI device to which request is going to be sent
+ * @temp_raw: where to store the read temperature
+ *
+ * It uses GetTemp PECI command.
+ *
+ * Return: 0 if succeeded, other values in case errors.
+ */
+int peci_temp_read(struct peci_device *device, s16 *temp_raw)
+{
+ struct peci_request *req;
+
+ req = peci_xfer_get_temp(device);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+
+ *temp_raw = peci_request_temp_read(req);
+
+ peci_request_free(req);
+
+ return 0;
+}
+EXPORT_SYMBOL_NS_GPL(peci_temp_read, PECI_CPU);
+
+/**
+ * peci_pcs_read() - read PCS register
+ * @device: PECI device to which request is going to be sent
+ * @index: PCS index
+ * @param: PCS parameter
+ * @data: where to store the read data
+ *
+ * It uses RdPkgConfig PECI command.
+ *
+ * Return: 0 if succeeded, other values in case errors.
+ */
+int peci_pcs_read(struct peci_device *device, u8 index, u16 param, u32 *data)
+{
+ struct peci_request *req;
+ int ret;
+
+ req = peci_xfer_pkg_cfg_readl(device, index, param);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+
+ ret = peci_request_status(req);
+ if (ret)
+ goto out_req_free;
+
+ *data = peci_request_data_readl(req);
+out_req_free:
+ peci_request_free(req);
+
+ return ret;
+}
+EXPORT_SYMBOL_NS_GPL(peci_pcs_read, PECI_CPU);
+
+/**
+ * peci_pci_local_read() - read 32-bit memory location using raw address
+ * @device: PECI device to which request is going to be sent
+ * @bus: bus
+ * @dev: device
+ * @func: function
+ * @reg: register
+ * @data: where to store the read data
+ *
+ * It uses RdPCIConfigLocal PECI command.
+ *
+ * Return: 0 if succeeded, other values in case errors.
+ */
+int peci_pci_local_read(struct peci_device *device, u8 bus, u8 dev, u8 func,
+ u16 reg, u32 *data)
+{
+ struct peci_request *req;
+ int ret;
+
+ req = peci_xfer_pci_cfg_local_readl(device, bus, dev, func, reg);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+
+ ret = peci_request_status(req);
+ if (ret)
+ goto out_req_free;
+
+ *data = peci_request_data_readl(req);
+out_req_free:
+ peci_request_free(req);
+
+ return ret;
+}
+EXPORT_SYMBOL_NS_GPL(peci_pci_local_read, PECI_CPU);
+
+/**
+ * peci_ep_pci_local_read() - read 32-bit memory location using raw address
+ * @device: PECI device to which request is going to be sent
+ * @seg: PCI segment
+ * @bus: bus
+ * @dev: device
+ * @func: function
+ * @reg: register
+ * @data: where to store the read data
+ *
+ * Like &peci_pci_local_read, but it uses RdEndpointConfig PECI command.
+ *
+ * Return: 0 if succeeded, other values in case errors.
+ */
+int peci_ep_pci_local_read(struct peci_device *device, u8 seg,
+ u8 bus, u8 dev, u8 func, u16 reg, u32 *data)
+{
+ struct peci_request *req;
+ int ret;
+
+ req = peci_xfer_ep_pci_cfg_local_readl(device, seg, bus, dev, func, reg);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+
+ ret = peci_request_status(req);
+ if (ret)
+ goto out_req_free;
+
+ *data = peci_request_data_readl(req);
+out_req_free:
+ peci_request_free(req);
+
+ return ret;
+}
+EXPORT_SYMBOL_NS_GPL(peci_ep_pci_local_read, PECI_CPU);
+
+/**
+ * peci_mmio_read() - read 32-bit memory location using 64-bit bar offset address
+ * @device: PECI device to which request is going to be sent
+ * @bar: PCI bar
+ * @seg: PCI segment
+ * @bus: bus
+ * @dev: device
+ * @func: function
+ * @address: 64-bit MMIO address
+ * @data: where to store the read data
+ *
+ * It uses RdEndpointConfig PECI command.
+ *
+ * Return: 0 if succeeded, other values in case errors.
+ */
+int peci_mmio_read(struct peci_device *device, u8 bar, u8 seg,
+ u8 bus, u8 dev, u8 func, u64 address, u32 *data)
+{
+ struct peci_request *req;
+ int ret;
+
+ req = peci_xfer_ep_mmio64_readl(device, bar, seg, bus, dev, func, address);
+ if (IS_ERR(req))
+ return PTR_ERR(req);
+
+ ret = peci_request_status(req);
+ if (ret)
+ goto out_req_free;
+
+ *data = peci_request_data_readl(req);
+out_req_free:
+ peci_request_free(req);
+
+ return ret;
+}
+EXPORT_SYMBOL_NS_GPL(peci_mmio_read, PECI_CPU);
+
+static const char * const peci_adev_types[] = {
+ "cputemp",
+ "dimmtemp",
+};
+
+struct peci_cpu {
+ struct peci_device *device;
+ const struct peci_device_id *id;
+};
+
+static void adev_release(struct device *dev)
+{
+ struct auxiliary_device *adev = to_auxiliary_dev(dev);
+
+ auxiliary_device_uninit(adev);
+
+ kfree(adev->name);
+ kfree(adev);
+}
+
+static struct auxiliary_device *adev_alloc(struct peci_cpu *priv, int idx)
+{
+ struct peci_controller *controller = to_peci_controller(priv->device->dev.parent);
+ struct auxiliary_device *adev;
+ const char *name;
+ int ret;
+
+ adev = kzalloc(sizeof(*adev), GFP_KERNEL);
+ if (!adev)
+ return ERR_PTR(-ENOMEM);
+
+ name = kasprintf(GFP_KERNEL, "%s.%s", peci_adev_types[idx], (const char *)priv->id->data);
+ if (!name) {
+ ret = -ENOMEM;
+ goto free_adev;
+ }
+
+ adev->name = name;
+ adev->dev.parent = &priv->device->dev;
+ adev->dev.release = adev_release;
+ adev->id = (controller->id << 16) | (priv->device->addr);
+
+ ret = auxiliary_device_init(adev);
+ if (ret)
+ goto free_name;
+
+ return adev;
+
+free_name:
+ kfree(name);
+free_adev:
+ kfree(adev);
+ return ERR_PTR(ret);
+}
+
+static void unregister_adev(void *_adev)
+{
+ struct auxiliary_device *adev = _adev;
+
+ auxiliary_device_delete(adev);
+}
+
+static int devm_adev_add(struct device *dev, int idx)
+{
+ struct peci_cpu *priv = dev_get_drvdata(dev);
+ struct auxiliary_device *adev;
+ int ret;
+
+ adev = adev_alloc(priv, idx);
+ if (IS_ERR(adev))
+ return PTR_ERR(adev);
+
+ ret = auxiliary_device_add(adev);
+ if (ret) {
+ auxiliary_device_uninit(adev);
+ return ret;
+ }
+
+ ret = devm_add_action_or_reset(&priv->device->dev, unregister_adev, adev);
+ if (ret)
+ return ret;
+
+ return 0;
+}
+
+static void peci_cpu_add_adevices(struct peci_cpu *priv)
+{
+ struct device *dev = &priv->device->dev;
+ int ret, i;
+
+ for (i = 0; i < ARRAY_SIZE(peci_adev_types); i++) {
+ ret = devm_adev_add(dev, i);
+ if (ret) {
+ dev_warn(dev, "Failed to register PECI auxiliary: %s, ret = %d\n",
+ peci_adev_types[i], ret);
+ continue;
+ }
+ }
+}
+
+static int
+peci_cpu_probe(struct peci_device *device, const struct peci_device_id *id)
+{
+ struct device *dev = &device->dev;
+ struct peci_cpu *priv;
+
+ priv = devm_kzalloc(dev, sizeof(*priv), GFP_KERNEL);
+ if (!priv)
+ return -ENOMEM;
+
+ dev_set_drvdata(dev, priv);
+ priv->device = device;
+ priv->id = id;
+
+ peci_cpu_add_adevices(priv);
+
+ return 0;
+}
+
+static const struct peci_device_id peci_cpu_device_ids[] = {
+ { /* Haswell Xeon */
+ .family = 6,
+ .model = INTEL_FAM6_HASWELL_X,
+ .data = "hsx",
+ },
+ { /* Broadwell Xeon */
+ .family = 6,
+ .model = INTEL_FAM6_BROADWELL_X,
+ .data = "bdx",
+ },
+ { /* Broadwell Xeon D */
+ .family = 6,
+ .model = INTEL_FAM6_BROADWELL_D,
+ .data = "bdxd",
+ },
+ { /* Skylake Xeon */
+ .family = 6,
+ .model = INTEL_FAM6_SKYLAKE_X,
+ .data = "skx",
+ },
+ { /* Icelake Xeon */
+ .family = 6,
+ .model = INTEL_FAM6_ICELAKE_X,
+ .data = "icx",
+ },
+ { /* Icelake Xeon D */
+ .family = 6,
+ .model = INTEL_FAM6_ICELAKE_D,
+ .data = "icxd",
+ },
+ { }
+};
+MODULE_DEVICE_TABLE(peci, peci_cpu_device_ids);
+
+static struct peci_driver peci_cpu_driver = {
+ .probe = peci_cpu_probe,
+ .id_table = peci_cpu_device_ids,
+ .driver = {
+ .name = "peci-cpu",
+ },
+};
+module_peci_driver(peci_cpu_driver);
+
+MODULE_AUTHOR("Iwona Winiarska <iwona.winiarska@intel.com>");
+MODULE_DESCRIPTION("PECI CPU driver");
+MODULE_LICENSE("GPL");
+MODULE_IMPORT_NS(PECI);