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peci: Add support for PECI device drivers
Add support for PECI device drivers, which unlike PECI controller drivers are actually able to provide functionalities to userspace. Also, extend peci_request API to allow querying more details about PECI device (e.g. model/family), that's going to be used to find a compatible peci_driver. Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Acked-by: Joel Stanley <joel@jms.id.au> Signed-off-by: Iwona Winiarska <iwona.winiarska@intel.com> Link: https://lore.kernel.org/r/20220208153639.255278-9-iwona.winiarska@intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Iwona Winiarska
Greg Kroah-Hartman
parent
42bed52b2e
commit
6b8145b054
@ -160,8 +160,52 @@ err_put:
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}
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EXPORT_SYMBOL_NS_GPL(devm_peci_controller_add, PECI);
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static const struct peci_device_id *
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peci_bus_match_device_id(const struct peci_device_id *id, struct peci_device *device)
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{
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while (id->family != 0) {
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if (id->family == device->info.family &&
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id->model == device->info.model)
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return id;
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id++;
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}
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return NULL;
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}
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static int peci_bus_device_match(struct device *dev, struct device_driver *drv)
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{
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struct peci_device *device = to_peci_device(dev);
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struct peci_driver *peci_drv = to_peci_driver(drv);
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if (dev->type != &peci_device_type)
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return 0;
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return !!peci_bus_match_device_id(peci_drv->id_table, device);
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}
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static int peci_bus_device_probe(struct device *dev)
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{
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struct peci_device *device = to_peci_device(dev);
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struct peci_driver *driver = to_peci_driver(dev->driver);
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return driver->probe(device, peci_bus_match_device_id(driver->id_table, device));
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}
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static void peci_bus_device_remove(struct device *dev)
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{
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struct peci_device *device = to_peci_device(dev);
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struct peci_driver *driver = to_peci_driver(dev->driver);
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if (driver->remove)
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driver->remove(device);
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}
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struct bus_type peci_bus_type = {
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.name = "peci",
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.match = peci_bus_device_match,
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.probe = peci_bus_device_probe,
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.remove = peci_bus_device_remove,
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.bus_groups = peci_bus_groups,
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};
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@ -1,6 +1,7 @@
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// SPDX-License-Identifier: GPL-2.0-only
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// Copyright (c) 2018-2021 Intel Corporation
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#include <linux/bitfield.h>
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#include <linux/peci.h>
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#include <linux/slab.h>
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@ -13,6 +14,104 @@
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*/
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static DEFINE_MUTEX(peci_device_del_lock);
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#define REVISION_NUM_MASK GENMASK(15, 8)
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static int peci_get_revision(struct peci_device *device, u8 *revision)
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{
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struct peci_request *req;
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u64 dib;
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req = peci_xfer_get_dib(device);
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if (IS_ERR(req))
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return PTR_ERR(req);
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/*
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* PECI device may be in a state where it is unable to return a proper
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* DIB, in which case it returns 0 as DIB value.
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* Let's treat this as an error to avoid carrying on with the detection
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* using invalid revision.
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*/
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dib = peci_request_dib_read(req);
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if (dib == 0) {
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peci_request_free(req);
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return -EIO;
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}
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*revision = FIELD_GET(REVISION_NUM_MASK, dib);
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peci_request_free(req);
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return 0;
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}
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static int peci_get_cpu_id(struct peci_device *device, u32 *cpu_id)
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{
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struct peci_request *req;
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int ret;
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req = peci_xfer_pkg_cfg_readl(device, PECI_PCS_PKG_ID, PECI_PKG_ID_CPU_ID);
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if (IS_ERR(req))
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return PTR_ERR(req);
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ret = peci_request_status(req);
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if (ret)
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goto out_req_free;
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*cpu_id = peci_request_data_readl(req);
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out_req_free:
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peci_request_free(req);
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return ret;
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}
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static unsigned int peci_x86_cpu_family(unsigned int sig)
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{
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unsigned int x86;
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x86 = (sig >> 8) & 0xf;
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if (x86 == 0xf)
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x86 += (sig >> 20) & 0xff;
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return x86;
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}
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static unsigned int peci_x86_cpu_model(unsigned int sig)
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{
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unsigned int fam, model;
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fam = peci_x86_cpu_family(sig);
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model = (sig >> 4) & 0xf;
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if (fam >= 0x6)
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model += ((sig >> 16) & 0xf) << 4;
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return model;
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}
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static int peci_device_info_init(struct peci_device *device)
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{
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u8 revision;
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u32 cpu_id;
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int ret;
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ret = peci_get_cpu_id(device, &cpu_id);
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if (ret)
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return ret;
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device->info.family = peci_x86_cpu_family(cpu_id);
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device->info.model = peci_x86_cpu_model(cpu_id);
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ret = peci_get_revision(device, &revision);
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if (ret)
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return ret;
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device->info.peci_revision = revision;
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device->info.socket_id = device->addr - PECI_BASE_ADDR;
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return 0;
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}
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static int peci_detect(struct peci_controller *controller, u8 addr)
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{
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/*
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@ -82,6 +181,10 @@ int peci_device_create(struct peci_controller *controller, u8 addr)
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device->dev.bus = &peci_bus_type;
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device->dev.type = &peci_device_type;
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ret = peci_device_info_init(device);
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if (ret)
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goto err_put;
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ret = dev_set_name(&device->dev, "%d-%02x", controller->id, device->addr);
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if (ret)
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goto err_put;
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@ -108,6 +211,33 @@ void peci_device_destroy(struct peci_device *device)
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mutex_unlock(&peci_device_del_lock);
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}
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int __peci_driver_register(struct peci_driver *driver, struct module *owner,
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const char *mod_name)
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{
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driver->driver.bus = &peci_bus_type;
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driver->driver.owner = owner;
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driver->driver.mod_name = mod_name;
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if (!driver->probe) {
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pr_err("peci: trying to register driver without probe callback\n");
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return -EINVAL;
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}
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if (!driver->id_table) {
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pr_err("peci: trying to register driver without device id table\n");
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return -EINVAL;
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}
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return driver_register(&driver->driver);
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}
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EXPORT_SYMBOL_NS_GPL(__peci_driver_register, PECI);
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void peci_driver_unregister(struct peci_driver *driver)
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{
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driver_unregister(&driver->driver);
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}
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EXPORT_SYMBOL_NS_GPL(peci_driver_unregister, PECI);
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static void peci_device_release(struct device *dev)
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{
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struct peci_device *device = to_peci_device(dev);
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@ -19,6 +19,35 @@ struct peci_request;
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struct peci_request *peci_request_alloc(struct peci_device *device, u8 tx_len, u8 rx_len);
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void peci_request_free(struct peci_request *req);
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int peci_request_status(struct peci_request *req);
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u64 peci_request_dib_read(struct peci_request *req);
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u8 peci_request_data_readb(struct peci_request *req);
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u16 peci_request_data_readw(struct peci_request *req);
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u32 peci_request_data_readl(struct peci_request *req);
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u64 peci_request_data_readq(struct peci_request *req);
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struct peci_request *peci_xfer_get_dib(struct peci_device *device);
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struct peci_request *peci_xfer_get_temp(struct peci_device *device);
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struct peci_request *peci_xfer_pkg_cfg_readb(struct peci_device *device, u8 index, u16 param);
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struct peci_request *peci_xfer_pkg_cfg_readw(struct peci_device *device, u8 index, u16 param);
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struct peci_request *peci_xfer_pkg_cfg_readl(struct peci_device *device, u8 index, u16 param);
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struct peci_request *peci_xfer_pkg_cfg_readq(struct peci_device *device, u8 index, u16 param);
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/**
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* struct peci_device_id - PECI device data to match
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* @data: pointer to driver private data specific to device
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* @family: device family
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* @model: device model
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*/
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struct peci_device_id {
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const void *data;
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u16 family;
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u8 model;
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};
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extern struct device_type peci_device_type;
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extern const struct attribute_group *peci_device_groups[];
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@ -28,6 +57,51 @@ void peci_device_destroy(struct peci_device *device);
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extern struct bus_type peci_bus_type;
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extern const struct attribute_group *peci_bus_groups[];
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/**
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* struct peci_driver - PECI driver
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* @driver: inherit device driver
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* @probe: probe callback
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* @remove: remove callback
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* @id_table: PECI device match table to decide which device to bind
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*/
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struct peci_driver {
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struct device_driver driver;
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int (*probe)(struct peci_device *device, const struct peci_device_id *id);
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void (*remove)(struct peci_device *device);
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const struct peci_device_id *id_table;
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};
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static inline struct peci_driver *to_peci_driver(struct device_driver *d)
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{
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return container_of(d, struct peci_driver, driver);
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}
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int __peci_driver_register(struct peci_driver *driver, struct module *owner,
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const char *mod_name);
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/**
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* peci_driver_register() - register PECI driver
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* @driver: the driver to be registered
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*
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* PECI drivers that don't need to do anything special in module init should
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* use the convenience "module_peci_driver" macro instead
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*
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* Return: zero on success, else a negative error code.
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*/
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#define peci_driver_register(driver) \
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__peci_driver_register(driver, THIS_MODULE, KBUILD_MODNAME)
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void peci_driver_unregister(struct peci_driver *driver);
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/**
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* module_peci_driver() - helper macro for registering a modular PECI driver
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* @__peci_driver: peci_driver struct
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*
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* Helper macro for PECI drivers which do not do anything special in module
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* init/exit. This eliminates a lot of boilerplate. Each module may only
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* use this macro once, and calling it replaces module_init() and module_exit()
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*/
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#define module_peci_driver(__peci_driver) \
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module_driver(__peci_driver, peci_driver_register, peci_driver_unregister)
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extern struct device_type peci_controller_type;
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int peci_controller_scan_devices(struct peci_controller *controller);
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@ -1,13 +1,140 @@
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// SPDX-License-Identifier: GPL-2.0-only
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// Copyright (c) 2021 Intel Corporation
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#include <linux/bug.h>
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#include <linux/export.h>
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#include <linux/peci.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <asm/unaligned.h>
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#include "internal.h"
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#define PECI_GET_DIB_CMD 0xf7
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#define PECI_GET_DIB_WR_LEN 1
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#define PECI_GET_DIB_RD_LEN 8
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#define PECI_RDPKGCFG_CMD 0xa1
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#define PECI_RDPKGCFG_WR_LEN 5
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#define PECI_RDPKGCFG_RD_LEN_BASE 1
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#define PECI_WRPKGCFG_CMD 0xa5
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#define PECI_WRPKGCFG_WR_LEN_BASE 6
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#define PECI_WRPKGCFG_RD_LEN 1
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/* Device Specific Completion Code (CC) Definition */
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#define PECI_CC_SUCCESS 0x40
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#define PECI_CC_NEED_RETRY 0x80
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#define PECI_CC_OUT_OF_RESOURCE 0x81
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#define PECI_CC_UNAVAIL_RESOURCE 0x82
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#define PECI_CC_INVALID_REQ 0x90
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#define PECI_CC_MCA_ERROR 0x91
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#define PECI_CC_CATASTROPHIC_MCA_ERROR 0x93
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#define PECI_CC_FATAL_MCA_ERROR 0x94
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#define PECI_CC_PARITY_ERR_GPSB_OR_PMSB 0x98
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#define PECI_CC_PARITY_ERR_GPSB_OR_PMSB_IERR 0x9B
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#define PECI_CC_PARITY_ERR_GPSB_OR_PMSB_MCA 0x9C
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#define PECI_RETRY_BIT BIT(0)
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#define PECI_RETRY_TIMEOUT msecs_to_jiffies(700)
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#define PECI_RETRY_INTERVAL_MIN msecs_to_jiffies(1)
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#define PECI_RETRY_INTERVAL_MAX msecs_to_jiffies(128)
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static u8 peci_request_data_cc(struct peci_request *req)
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{
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return req->rx.buf[0];
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}
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/**
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* peci_request_status() - return -errno based on PECI completion code
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* @req: the PECI request that contains response data with completion code
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*
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* It can't be used for Ping(), GetDIB() and GetTemp() - for those commands we
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* don't expect completion code in the response.
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*
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* Return: -errno
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*/
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int peci_request_status(struct peci_request *req)
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{
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u8 cc = peci_request_data_cc(req);
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if (cc != PECI_CC_SUCCESS)
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dev_dbg(&req->device->dev, "ret: %#02x\n", cc);
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switch (cc) {
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case PECI_CC_SUCCESS:
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return 0;
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case PECI_CC_NEED_RETRY:
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case PECI_CC_OUT_OF_RESOURCE:
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case PECI_CC_UNAVAIL_RESOURCE:
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return -EAGAIN;
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case PECI_CC_INVALID_REQ:
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return -EINVAL;
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case PECI_CC_MCA_ERROR:
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case PECI_CC_CATASTROPHIC_MCA_ERROR:
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case PECI_CC_FATAL_MCA_ERROR:
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case PECI_CC_PARITY_ERR_GPSB_OR_PMSB:
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case PECI_CC_PARITY_ERR_GPSB_OR_PMSB_IERR:
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case PECI_CC_PARITY_ERR_GPSB_OR_PMSB_MCA:
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return -EIO;
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}
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WARN_ONCE(1, "Unknown PECI completion code: %#02x\n", cc);
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return -EIO;
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}
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EXPORT_SYMBOL_NS_GPL(peci_request_status, PECI);
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static int peci_request_xfer(struct peci_request *req)
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{
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struct peci_device *device = req->device;
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struct peci_controller *controller = to_peci_controller(device->dev.parent);
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int ret;
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mutex_lock(&controller->bus_lock);
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ret = controller->ops->xfer(controller, device->addr, req);
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mutex_unlock(&controller->bus_lock);
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return ret;
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}
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static int peci_request_xfer_retry(struct peci_request *req)
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{
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long wait_interval = PECI_RETRY_INTERVAL_MIN;
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struct peci_device *device = req->device;
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struct peci_controller *controller = to_peci_controller(device->dev.parent);
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unsigned long start = jiffies;
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int ret;
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/* Don't try to use it for ping */
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if (WARN_ON(req->tx.len == 0))
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return 0;
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do {
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ret = peci_request_xfer(req);
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if (ret) {
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dev_dbg(&controller->dev, "xfer error: %d\n", ret);
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return ret;
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}
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if (peci_request_status(req) != -EAGAIN)
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return 0;
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/* Set the retry bit to indicate a retry attempt */
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req->tx.buf[1] |= PECI_RETRY_BIT;
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if (schedule_timeout_interruptible(wait_interval))
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return -ERESTARTSYS;
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wait_interval = min_t(long, wait_interval * 2, PECI_RETRY_INTERVAL_MAX);
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} while (time_before(jiffies, start + PECI_RETRY_TIMEOUT));
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dev_dbg(&controller->dev, "request timed out\n");
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return -ETIMEDOUT;
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}
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/**
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* peci_request_alloc() - allocate &struct peci_requests
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* @device: PECI device to which request is going to be sent
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@ -53,3 +180,90 @@ void peci_request_free(struct peci_request *req)
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kfree(req);
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}
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EXPORT_SYMBOL_NS_GPL(peci_request_free, PECI);
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|
||||
struct peci_request *peci_xfer_get_dib(struct peci_device *device)
|
||||
{
|
||||
struct peci_request *req;
|
||||
int ret;
|
||||
|
||||
req = peci_request_alloc(device, PECI_GET_DIB_WR_LEN, PECI_GET_DIB_RD_LEN);
|
||||
if (!req)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
req->tx.buf[0] = PECI_GET_DIB_CMD;
|
||||
|
||||
ret = peci_request_xfer(req);
|
||||
if (ret) {
|
||||
peci_request_free(req);
|
||||
return ERR_PTR(ret);
|
||||
}
|
||||
|
||||
return req;
|
||||
}
|
||||
EXPORT_SYMBOL_NS_GPL(peci_xfer_get_dib, PECI);
|
||||
|
||||
static struct peci_request *
|
||||
__pkg_cfg_read(struct peci_device *device, u8 index, u16 param, u8 len)
|
||||
{
|
||||
struct peci_request *req;
|
||||
int ret;
|
||||
|
||||
req = peci_request_alloc(device, PECI_RDPKGCFG_WR_LEN, PECI_RDPKGCFG_RD_LEN_BASE + len);
|
||||
if (!req)
|
||||
return ERR_PTR(-ENOMEM);
|
||||
|
||||
req->tx.buf[0] = PECI_RDPKGCFG_CMD;
|
||||
req->tx.buf[1] = 0;
|
||||
req->tx.buf[2] = index;
|
||||
put_unaligned_le16(param, &req->tx.buf[3]);
|
||||
|
||||
ret = peci_request_xfer_retry(req);
|
||||
if (ret) {
|
||||
peci_request_free(req);
|
||||
return ERR_PTR(ret);
|
||||
}
|
||||
|
||||
return req;
|
||||
}
|
||||
|
||||
u8 peci_request_data_readb(struct peci_request *req)
|
||||
{
|
||||
return req->rx.buf[1];
|
||||
}
|
||||
EXPORT_SYMBOL_NS_GPL(peci_request_data_readb, PECI);
|
||||
|
||||
u16 peci_request_data_readw(struct peci_request *req)
|
||||
{
|
||||
return get_unaligned_le16(&req->rx.buf[1]);
|
||||
}
|
||||
EXPORT_SYMBOL_NS_GPL(peci_request_data_readw, PECI);
|
||||
|
||||
u32 peci_request_data_readl(struct peci_request *req)
|
||||
{
|
||||
return get_unaligned_le32(&req->rx.buf[1]);
|
||||
}
|
||||
EXPORT_SYMBOL_NS_GPL(peci_request_data_readl, PECI);
|
||||
|
||||
u64 peci_request_data_readq(struct peci_request *req)
|
||||
{
|
||||
return get_unaligned_le64(&req->rx.buf[1]);
|
||||
}
|
||||
EXPORT_SYMBOL_NS_GPL(peci_request_data_readq, PECI);
|
||||
|
||||
u64 peci_request_dib_read(struct peci_request *req)
|
||||
{
|
||||
return get_unaligned_le64(&req->rx.buf[0]);
|
||||
}
|
||||
EXPORT_SYMBOL_NS_GPL(peci_request_dib_read, PECI);
|
||||
|
||||
#define __read_pkg_config(x, type) \
|
||||
struct peci_request *peci_xfer_pkg_cfg_##x(struct peci_device *device, u8 index, u16 param) \
|
||||
{ \
|
||||
return __pkg_cfg_read(device, index, param, sizeof(type)); \
|
||||
} \
|
||||
EXPORT_SYMBOL_NS_GPL(peci_xfer_pkg_cfg_##x, PECI)
|
||||
|
||||
__read_pkg_config(readb, u8);
|
||||
__read_pkg_config(readw, u16);
|
||||
__read_pkg_config(readl, u32);
|
||||
__read_pkg_config(readq, u64);
|
||||
|
||||
@ -14,6 +14,14 @@
|
||||
*/
|
||||
#define PECI_REQUEST_MAX_BUF_SIZE 32
|
||||
|
||||
#define PECI_PCS_PKG_ID 0 /* Package Identifier Read */
|
||||
#define PECI_PKG_ID_CPU_ID 0x0000 /* CPUID Info */
|
||||
#define PECI_PKG_ID_PLATFORM_ID 0x0001 /* Platform ID */
|
||||
#define PECI_PKG_ID_DEVICE_ID 0x0002 /* Uncore Device ID */
|
||||
#define PECI_PKG_ID_MAX_THREAD_ID 0x0003 /* Max Thread ID */
|
||||
#define PECI_PKG_ID_MICROCODE_REV 0x0004 /* CPU Microcode Update Revision */
|
||||
#define PECI_PKG_ID_MCA_ERROR_LOG 0x0005 /* Machine Check Status */
|
||||
|
||||
struct peci_controller;
|
||||
struct peci_request;
|
||||
|
||||
@ -59,6 +67,11 @@ static inline struct peci_controller *to_peci_controller(void *d)
|
||||
* struct peci_device - PECI device
|
||||
* @dev: device object to register PECI device to the device model
|
||||
* @controller: manages the bus segment hosting this PECI device
|
||||
* @info: PECI device characteristics
|
||||
* @info.family: device family
|
||||
* @info.model: device model
|
||||
* @info.peci_revision: PECI revision supported by the PECI device
|
||||
* @info.socket_id: the socket ID represented by the PECI device
|
||||
* @addr: address used on the PECI bus connected to the parent controller
|
||||
* @deleted: indicates that PECI device was already deleted
|
||||
*
|
||||
@ -68,6 +81,12 @@ static inline struct peci_controller *to_peci_controller(void *d)
|
||||
*/
|
||||
struct peci_device {
|
||||
struct device dev;
|
||||
struct {
|
||||
u16 family;
|
||||
u8 model;
|
||||
u8 peci_revision;
|
||||
u8 socket_id;
|
||||
} info;
|
||||
u8 addr;
|
||||
bool deleted;
|
||||
};
|
||||
|
||||
Loading…
Reference in New Issue
Block a user