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linux/drivers/thermal/int340x_thermal/processor_thermal_device.c
Srinivas Pandruvada f1ba9eb85b thermal: int340x: processor_thermal: support acpi notification 
BIOS/EC can change PPCC element dynamically and inform OS about the change.
When this driver receives notification, it will read PPCC element again.

Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
2016-05-08 00:07:38 +08:00

515 lines
13 KiB
C
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/*
* processor_thermal_device.c
* Copyright (c) 2014, Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
*/
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/pci.h>
#include <linux/interrupt.h>
#include <linux/platform_device.h>
#include <linux/acpi.h>
#include <linux/thermal.h>
#include "int340x_thermal_zone.h"
#include "../intel_soc_dts_iosf.h"
/* Broadwell-U/HSB thermal reporting device */
#define PCI_DEVICE_ID_PROC_BDW_THERMAL 0x1603
#define PCI_DEVICE_ID_PROC_HSB_THERMAL 0x0A03
/* Skylake thermal reporting device */
#define PCI_DEVICE_ID_PROC_SKL_THERMAL 0x1903
/* Braswell thermal reporting device */
#define PCI_DEVICE_ID_PROC_BSW_THERMAL 0x22DC
/* Broxton thermal reporting device */
#define PCI_DEVICE_ID_PROC_BXT0_THERMAL 0x0A8C
#define PCI_DEVICE_ID_PROC_BXT1_THERMAL 0x1A8C
#define PCI_DEVICE_ID_PROC_BXTX_THERMAL 0x4A8C
#define PCI_DEVICE_ID_PROC_BXTP_THERMAL 0x5A8C
struct power_config {
u32 index;
u32 min_uw;
u32 max_uw;
u32 tmin_us;
u32 tmax_us;
u32 step_uw;
};
struct proc_thermal_device {
struct device *dev;
struct acpi_device *adev;
struct power_config power_limits[2];
struct int34x_thermal_zone *int340x_zone;
struct intel_soc_dts_sensors *soc_dts;
};
enum proc_thermal_emum_mode_type {
PROC_THERMAL_NONE,
PROC_THERMAL_PCI,
PROC_THERMAL_PLATFORM_DEV
};
/*
* We can have only one type of enumeration, PCI or Platform,
* not both. So we don't need instance specific data.
*/
static enum proc_thermal_emum_mode_type proc_thermal_emum_mode =
PROC_THERMAL_NONE;
#define POWER_LIMIT_SHOW(index, suffix) \
static ssize_t power_limit_##index##_##suffix##_show(struct device *dev, \
struct device_attribute *attr, \
char *buf) \
{ \
struct pci_dev *pci_dev; \
struct platform_device *pdev; \
struct proc_thermal_device *proc_dev; \
\
if (proc_thermal_emum_mode == PROC_THERMAL_PLATFORM_DEV) { \
pdev = to_platform_device(dev); \
proc_dev = platform_get_drvdata(pdev); \
} else { \
pci_dev = to_pci_dev(dev); \
proc_dev = pci_get_drvdata(pci_dev); \
} \
return sprintf(buf, "%lu\n",\
(unsigned long)proc_dev->power_limits[index].suffix * 1000); \
}
POWER_LIMIT_SHOW(0, min_uw)
POWER_LIMIT_SHOW(0, max_uw)
POWER_LIMIT_SHOW(0, step_uw)
POWER_LIMIT_SHOW(0, tmin_us)
POWER_LIMIT_SHOW(0, tmax_us)
POWER_LIMIT_SHOW(1, min_uw)
POWER_LIMIT_SHOW(1, max_uw)
POWER_LIMIT_SHOW(1, step_uw)
POWER_LIMIT_SHOW(1, tmin_us)
POWER_LIMIT_SHOW(1, tmax_us)
static DEVICE_ATTR_RO(power_limit_0_min_uw);
static DEVICE_ATTR_RO(power_limit_0_max_uw);
static DEVICE_ATTR_RO(power_limit_0_step_uw);
static DEVICE_ATTR_RO(power_limit_0_tmin_us);
static DEVICE_ATTR_RO(power_limit_0_tmax_us);
static DEVICE_ATTR_RO(power_limit_1_min_uw);
static DEVICE_ATTR_RO(power_limit_1_max_uw);
static DEVICE_ATTR_RO(power_limit_1_step_uw);
static DEVICE_ATTR_RO(power_limit_1_tmin_us);
static DEVICE_ATTR_RO(power_limit_1_tmax_us);
static struct attribute *power_limit_attrs[] = {
&dev_attr_power_limit_0_min_uw.attr,
&dev_attr_power_limit_1_min_uw.attr,
&dev_attr_power_limit_0_max_uw.attr,
&dev_attr_power_limit_1_max_uw.attr,
&dev_attr_power_limit_0_step_uw.attr,
&dev_attr_power_limit_1_step_uw.attr,
&dev_attr_power_limit_0_tmin_us.attr,
&dev_attr_power_limit_1_tmin_us.attr,
&dev_attr_power_limit_0_tmax_us.attr,
&dev_attr_power_limit_1_tmax_us.attr,
NULL
};
static struct attribute_group power_limit_attribute_group = {
.attrs = power_limit_attrs,
.name = "power_limits"
};
static int stored_tjmax; /* since it is fixed, we can have local storage */
static int get_tjmax(void)
{
u32 eax, edx;
u32 val;
int err;
err = rdmsr_safe(MSR_IA32_TEMPERATURE_TARGET, &eax, &edx);
if (err)
return err;
val = (eax >> 16) & 0xff;
if (val)
return val;
return -EINVAL;
}
static int read_temp_msr(int *temp)
{
int cpu;
u32 eax, edx;
int err;
unsigned long curr_temp_off = 0;
*temp = 0;
for_each_online_cpu(cpu) {
err = rdmsr_safe_on_cpu(cpu, MSR_IA32_THERM_STATUS, &eax,
&edx);
if (err)
goto err_ret;
else {
if (eax & 0x80000000) {
curr_temp_off = (eax >> 16) & 0x7f;
if (!*temp || curr_temp_off < *temp)
*temp = curr_temp_off;
} else {
err = -EINVAL;
goto err_ret;
}
}
}
return 0;
err_ret:
return err;
}
static int proc_thermal_get_zone_temp(struct thermal_zone_device *zone,
int *temp)
{
int ret;
ret = read_temp_msr(temp);
if (!ret)
*temp = (stored_tjmax - *temp) * 1000;
return ret;
}
static struct thermal_zone_device_ops proc_thermal_local_ops = {
.get_temp = proc_thermal_get_zone_temp,
};
static int proc_thermal_read_ppcc(struct proc_thermal_device *proc_priv)
{
int i;
acpi_status status;
struct acpi_buffer buf = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *elements, *ppcc;
union acpi_object *p;
int ret = 0;
status = acpi_evaluate_object(proc_priv->adev->handle, "PPCC",
NULL, &buf);
if (ACPI_FAILURE(status))
return -ENODEV;
p = buf.pointer;
if (!p || (p->type != ACPI_TYPE_PACKAGE)) {
dev_err(proc_priv->dev, "Invalid PPCC data\n");
ret = -EFAULT;
goto free_buffer;
}
if (!p->package.count) {
dev_err(proc_priv->dev, "Invalid PPCC package size\n");
ret = -EFAULT;
goto free_buffer;
}
for (i = 0; i < min((int)p->package.count - 1, 2); ++i) {
elements = &(p->package.elements[i+1]);
if (elements->type != ACPI_TYPE_PACKAGE ||
elements->package.count != 6) {
ret = -EFAULT;
goto free_buffer;
}
ppcc = elements->package.elements;
proc_priv->power_limits[i].index = ppcc[0].integer.value;
proc_priv->power_limits[i].min_uw = ppcc[1].integer.value;
proc_priv->power_limits[i].max_uw = ppcc[2].integer.value;
proc_priv->power_limits[i].tmin_us = ppcc[3].integer.value;
proc_priv->power_limits[i].tmax_us = ppcc[4].integer.value;
proc_priv->power_limits[i].step_uw = ppcc[5].integer.value;
}
free_buffer:
kfree(buf.pointer);
return ret;
}
#define PROC_POWER_CAPABILITY_CHANGED 0x83
static void proc_thermal_notify(acpi_handle handle, u32 event, void *data)
{
struct proc_thermal_device *proc_priv = data;
if (!proc_priv)
return;
switch (event) {
case PROC_POWER_CAPABILITY_CHANGED:
proc_thermal_read_ppcc(proc_priv);
int340x_thermal_zone_device_update(proc_priv->int340x_zone);
break;
default:
dev_err(proc_priv->dev, "Unsupported event [0x%x]\n", event);
break;
}
}
static int proc_thermal_add(struct device *dev,
struct proc_thermal_device **priv)
{
struct proc_thermal_device *proc_priv;
struct acpi_device *adev;
acpi_status status;
unsigned long long tmp;
struct thermal_zone_device_ops *ops = NULL;
int ret;
adev = ACPI_COMPANION(dev);
if (!adev)
return -ENODEV;
proc_priv = devm_kzalloc(dev, sizeof(*proc_priv), GFP_KERNEL);
if (!proc_priv)
return -ENOMEM;
proc_priv->dev = dev;
proc_priv->adev = adev;
*priv = proc_priv;
ret = proc_thermal_read_ppcc(proc_priv);
if (!ret) {
ret = sysfs_create_group(&dev->kobj,
&power_limit_attribute_group);
}
if (ret)
return ret;
status = acpi_evaluate_integer(adev->handle, "_TMP", NULL, &tmp);
if (ACPI_FAILURE(status)) {
/* there is no _TMP method, add local method */
stored_tjmax = get_tjmax();
if (stored_tjmax > 0)
ops = &proc_thermal_local_ops;
}
proc_priv->int340x_zone = int340x_thermal_zone_add(adev, ops);
if (IS_ERR(proc_priv->int340x_zone)) {
ret = PTR_ERR(proc_priv->int340x_zone);
goto remove_group;
} else
ret = 0;
ret = acpi_install_notify_handler(adev->handle, ACPI_DEVICE_NOTIFY,
proc_thermal_notify,
(void *)proc_priv);
if (ret)
goto remove_zone;
return 0;
remove_zone:
int340x_thermal_zone_remove(proc_priv->int340x_zone);
remove_group:
sysfs_remove_group(&proc_priv->dev->kobj,
&power_limit_attribute_group);
return ret;
}
static void proc_thermal_remove(struct proc_thermal_device *proc_priv)
{
acpi_remove_notify_handler(proc_priv->adev->handle,
ACPI_DEVICE_NOTIFY, proc_thermal_notify);
int340x_thermal_zone_remove(proc_priv->int340x_zone);
sysfs_remove_group(&proc_priv->dev->kobj,
&power_limit_attribute_group);
}
static int int3401_add(struct platform_device *pdev)
{
struct proc_thermal_device *proc_priv;
int ret;
if (proc_thermal_emum_mode == PROC_THERMAL_PCI) {
dev_err(&pdev->dev, "error: enumerated as PCI dev\n");
return -ENODEV;
}
ret = proc_thermal_add(&pdev->dev, &proc_priv);
if (ret)
return ret;
platform_set_drvdata(pdev, proc_priv);
proc_thermal_emum_mode = PROC_THERMAL_PLATFORM_DEV;
return 0;
}
static int int3401_remove(struct platform_device *pdev)
{
proc_thermal_remove(platform_get_drvdata(pdev));
return 0;
}
static irqreturn_t proc_thermal_pci_msi_irq(int irq, void *devid)
{
struct proc_thermal_device *proc_priv;
struct pci_dev *pdev = devid;
proc_priv = pci_get_drvdata(pdev);
intel_soc_dts_iosf_interrupt_handler(proc_priv->soc_dts);
return IRQ_HANDLED;
}
static int proc_thermal_pci_probe(struct pci_dev *pdev,
const struct pci_device_id *unused)
{
struct proc_thermal_device *proc_priv;
int ret;
if (proc_thermal_emum_mode == PROC_THERMAL_PLATFORM_DEV) {
dev_err(&pdev->dev, "error: enumerated as platform dev\n");
return -ENODEV;
}
ret = pci_enable_device(pdev);
if (ret < 0) {
dev_err(&pdev->dev, "error: could not enable device\n");
return ret;
}
ret = proc_thermal_add(&pdev->dev, &proc_priv);
if (ret) {
pci_disable_device(pdev);
return ret;
}
pci_set_drvdata(pdev, proc_priv);
proc_thermal_emum_mode = PROC_THERMAL_PCI;
if (pdev->device == PCI_DEVICE_ID_PROC_BSW_THERMAL) {
/*
* Enumerate additional DTS sensors available via IOSF.
* But we are not treating as a failure condition, if
* there are no aux DTSs enabled or fails. This driver
* already exposes sensors, which can be accessed via
* ACPI/MSR. So we don't want to fail for auxiliary DTSs.
*/
proc_priv->soc_dts = intel_soc_dts_iosf_init(
INTEL_SOC_DTS_INTERRUPT_MSI, 2, 0);
if (proc_priv->soc_dts && pdev->irq) {
ret = pci_enable_msi(pdev);
if (!ret) {
ret = request_threaded_irq(pdev->irq, NULL,
proc_thermal_pci_msi_irq,
IRQF_ONESHOT, "proc_thermal",
pdev);
if (ret) {
intel_soc_dts_iosf_exit(
proc_priv->soc_dts);
pci_disable_msi(pdev);
proc_priv->soc_dts = NULL;
}
}
} else
dev_err(&pdev->dev, "No auxiliary DTSs enabled\n");
}
return 0;
}
static void proc_thermal_pci_remove(struct pci_dev *pdev)
{
struct proc_thermal_device *proc_priv = pci_get_drvdata(pdev);
if (proc_priv->soc_dts) {
intel_soc_dts_iosf_exit(proc_priv->soc_dts);
if (pdev->irq) {
free_irq(pdev->irq, pdev);
pci_disable_msi(pdev);
}
}
proc_thermal_remove(proc_priv);
pci_disable_device(pdev);
}
static const struct pci_device_id proc_thermal_pci_ids[] = {
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BDW_THERMAL)},
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_HSB_THERMAL)},
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_SKL_THERMAL)},
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BSW_THERMAL)},
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BXT0_THERMAL)},
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BXT1_THERMAL)},
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BXTX_THERMAL)},
{ PCI_DEVICE(PCI_VENDOR_ID_INTEL, PCI_DEVICE_ID_PROC_BXTP_THERMAL)},
{ 0, },
};
MODULE_DEVICE_TABLE(pci, proc_thermal_pci_ids);
static struct pci_driver proc_thermal_pci_driver = {
.name = "proc_thermal",
.probe = proc_thermal_pci_probe,
.remove = proc_thermal_pci_remove,
.id_table = proc_thermal_pci_ids,
};
static const struct acpi_device_id int3401_device_ids[] = {
{"INT3401", 0},
{"", 0},
};
MODULE_DEVICE_TABLE(acpi, int3401_device_ids);
static struct platform_driver int3401_driver = {
.probe = int3401_add,
.remove = int3401_remove,
.driver = {
.name = "int3401 thermal",
.acpi_match_table = int3401_device_ids,
},
};
static int __init proc_thermal_init(void)
{
int ret;
ret = platform_driver_register(&int3401_driver);
if (ret)
return ret;
ret = pci_register_driver(&proc_thermal_pci_driver);
return ret;
}
static void __exit proc_thermal_exit(void)
{
platform_driver_unregister(&int3401_driver);
pci_unregister_driver(&proc_thermal_pci_driver);
}
module_init(proc_thermal_init);
module_exit(proc_thermal_exit);
MODULE_AUTHOR("Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>");
MODULE_DESCRIPTION("Processor Thermal Reporting Device Driver");
MODULE_LICENSE("GPL v2");
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