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linux/drivers/misc/mei/pci-me.c
Alexander Usyskin 2f79d3d1f7 mei: add device kind to sysfs 
Some of the mei device heads are not generic and have
a specific purpose, we need to announce it to the user space
so it is possible to detect the correct device node via
matching attributes.

Generic heads are marked as 'mei' while special purpose heads
have their own names. Currently we are adding 'itouch' string
for Intel IPTS 1.0, 2.0 devices.

This is done via new sysfs attribute 'kind'.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Link: https://lore.kernel.org/r/20200728192242.3117779-1-tomas.winkler@intel.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-07-29 16:21:13 +02:00

528 lines
13 KiB
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// SPDX-License-Identifier: GPL-2.0
/*
* Copyright (c) 2003-2020, Intel Corporation. All rights reserved.
* Intel Management Engine Interface (Intel MEI) Linux driver
*/
#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/sched.h>
#include <linux/interrupt.h>
#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>
#include <linux/mei.h>
#include "mei_dev.h"
#include "client.h"
#include "hw-me-regs.h"
#include "hw-me.h"
/* mei_pci_tbl - PCI Device ID Table */
static const struct pci_device_id mei_me_pci_tbl[] = {
{MEI_PCI_DEVICE(MEI_DEV_ID_82946GZ, MEI_ME_ICH_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_82G35, MEI_ME_ICH_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_82Q965, MEI_ME_ICH_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_82G965, MEI_ME_ICH_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_82GM965, MEI_ME_ICH_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_82GME965, MEI_ME_ICH_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82Q35, MEI_ME_ICH_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82G33, MEI_ME_ICH_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82Q33, MEI_ME_ICH_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82X38, MEI_ME_ICH_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_3200, MEI_ME_ICH_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_6, MEI_ME_ICH_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_7, MEI_ME_ICH_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_8, MEI_ME_ICH_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_9, MEI_ME_ICH_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_10, MEI_ME_ICH_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_1, MEI_ME_ICH_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_2, MEI_ME_ICH_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_3, MEI_ME_ICH_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_4, MEI_ME_ICH_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_1, MEI_ME_ICH10_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_2, MEI_ME_ICH10_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_3, MEI_ME_ICH10_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_4, MEI_ME_ICH10_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_IBXPK_1, MEI_ME_PCH6_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_IBXPK_2, MEI_ME_PCH6_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_CPT_1, MEI_ME_PCH_CPT_PBG_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_PBG_1, MEI_ME_PCH_CPT_PBG_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_PPT_1, MEI_ME_PCH7_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_PPT_2, MEI_ME_PCH7_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_PPT_3, MEI_ME_PCH7_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_LPT_H, MEI_ME_PCH8_SPS_4_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_LPT_W, MEI_ME_PCH8_SPS_4_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_LPT_LP, MEI_ME_PCH8_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_LPT_HR, MEI_ME_PCH8_SPS_4_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_WPT_LP, MEI_ME_PCH8_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_WPT_LP_2, MEI_ME_PCH8_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_SPT, MEI_ME_PCH8_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_SPT_2, MEI_ME_PCH8_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_SPT_3, MEI_ME_PCH8_ITOUCH_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_SPT_H, MEI_ME_PCH8_SPS_4_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_SPT_H_2, MEI_ME_PCH8_SPS_4_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_LBG, MEI_ME_PCH12_SPS_4_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_BXT_M, MEI_ME_PCH8_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_APL_I, MEI_ME_PCH8_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_DNV_IE, MEI_ME_PCH8_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_GLK, MEI_ME_PCH8_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_KBP, MEI_ME_PCH8_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_KBP_2, MEI_ME_PCH8_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_KBP_3, MEI_ME_PCH8_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_CNP_LP, MEI_ME_PCH12_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_CNP_LP_3, MEI_ME_PCH8_ITOUCH_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_CNP_H, MEI_ME_PCH12_SPS_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_CNP_H_3, MEI_ME_PCH12_SPS_ITOUCH_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_CMP_LP, MEI_ME_PCH12_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_CMP_LP_3, MEI_ME_PCH8_ITOUCH_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_CMP_V, MEI_ME_PCH12_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_CMP_H, MEI_ME_PCH12_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_CMP_H_3, MEI_ME_PCH8_ITOUCH_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICP_LP, MEI_ME_PCH12_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_TGP_LP, MEI_ME_PCH15_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_TGP_H, MEI_ME_PCH15_SPS_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_JSP_N, MEI_ME_PCH15_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_MCC, MEI_ME_PCH15_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_MCC_4, MEI_ME_PCH8_CFG)},
{MEI_PCI_DEVICE(MEI_DEV_ID_CDF, MEI_ME_PCH8_CFG)},
/* required last entry */
{0, }
};
MODULE_DEVICE_TABLE(pci, mei_me_pci_tbl);
#ifdef CONFIG_PM
static inline void mei_me_set_pm_domain(struct mei_device *dev);
static inline void mei_me_unset_pm_domain(struct mei_device *dev);
#else
static inline void mei_me_set_pm_domain(struct mei_device *dev) {}
static inline void mei_me_unset_pm_domain(struct mei_device *dev) {}
#endif /* CONFIG_PM */
static int mei_me_read_fws(const struct mei_device *dev, int where, u32 *val)
{
struct pci_dev *pdev = to_pci_dev(dev->dev);
return pci_read_config_dword(pdev, where, val);
}
/**
* mei_me_quirk_probe - probe for devices that doesn't valid ME interface
*
* @pdev: PCI device structure
* @cfg: per generation config
*
* Return: true if ME Interface is valid, false otherwise
*/
static bool mei_me_quirk_probe(struct pci_dev *pdev,
const struct mei_cfg *cfg)
{
if (cfg->quirk_probe && cfg->quirk_probe(pdev)) {
dev_info(&pdev->dev, "Device doesn't have valid ME Interface\n");
return false;
}
return true;
}
/**
* mei_me_probe - Device Initialization Routine
*
* @pdev: PCI device structure
* @ent: entry in kcs_pci_tbl
*
* Return: 0 on success, <0 on failure.
*/
static int mei_me_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
const struct mei_cfg *cfg;
struct mei_device *dev;
struct mei_me_hw *hw;
unsigned int irqflags;
int err;
cfg = mei_me_get_cfg(ent->driver_data);
if (!cfg)
return -ENODEV;
if (!mei_me_quirk_probe(pdev, cfg))
return -ENODEV;
/* enable pci dev */
err = pcim_enable_device(pdev);
if (err) {
dev_err(&pdev->dev, "failed to enable pci device.\n");
goto end;
}
/* set PCI host mastering */
pci_set_master(pdev);
/* pci request regions and mapping IO device memory for mei driver */
err = pcim_iomap_regions(pdev, BIT(0), KBUILD_MODNAME);
if (err) {
dev_err(&pdev->dev, "failed to get pci regions.\n");
goto end;
}
if (dma_set_mask(&pdev->dev, DMA_BIT_MASK(64)) ||
dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64))) {
err = dma_set_mask(&pdev->dev, DMA_BIT_MASK(32));
if (err)
err = dma_set_coherent_mask(&pdev->dev,
DMA_BIT_MASK(32));
}
if (err) {
dev_err(&pdev->dev, "No usable DMA configuration, aborting\n");
goto end;
}
/* allocates and initializes the mei dev structure */
dev = mei_me_dev_init(&pdev->dev, cfg);
if (!dev) {
err = -ENOMEM;
goto end;
}
hw = to_me_hw(dev);
hw->mem_addr = pcim_iomap_table(pdev)[0];
hw->read_fws = mei_me_read_fws;
pci_enable_msi(pdev);
hw->irq = pdev->irq;
/* request and enable interrupt */
irqflags = pci_dev_msi_enabled(pdev) ? IRQF_ONESHOT : IRQF_SHARED;
err = request_threaded_irq(pdev->irq,
mei_me_irq_quick_handler,
mei_me_irq_thread_handler,
irqflags, KBUILD_MODNAME, dev);
if (err) {
dev_err(&pdev->dev, "request_threaded_irq failure. irq = %d\n",
pdev->irq);
goto end;
}
if (mei_start(dev)) {
dev_err(&pdev->dev, "init hw failure.\n");
err = -ENODEV;
goto release_irq;
}
pm_runtime_set_autosuspend_delay(&pdev->dev, MEI_ME_RPM_TIMEOUT);
pm_runtime_use_autosuspend(&pdev->dev);
err = mei_register(dev, &pdev->dev);
if (err)
goto stop;
pci_set_drvdata(pdev, dev);
/*
* MEI requires to resume from runtime suspend mode
* in order to perform link reset flow upon system suspend.
*/
dev_pm_set_driver_flags(&pdev->dev, DPM_FLAG_NO_DIRECT_COMPLETE);
/*
* ME maps runtime suspend/resume to D0i states,
* hence we need to go around native PCI runtime service which
* eventually brings the device into D3cold/hot state,
* but the mei device cannot wake up from D3 unlike from D0i3.
* To get around the PCI device native runtime pm,
* ME uses runtime pm domain handlers which take precedence
* over the driver's pm handlers.
*/
mei_me_set_pm_domain(dev);
if (mei_pg_is_enabled(dev)) {
pm_runtime_put_noidle(&pdev->dev);
if (hw->d0i3_supported)
pm_runtime_allow(&pdev->dev);
}
dev_dbg(&pdev->dev, "initialization successful.\n");
return 0;
stop:
mei_stop(dev);
release_irq:
mei_cancel_work(dev);
mei_disable_interrupts(dev);
free_irq(pdev->irq, dev);
end:
dev_err(&pdev->dev, "initialization failed.\n");
return err;
}
/**
* mei_me_shutdown - Device Removal Routine
*
* @pdev: PCI device structure
*
* mei_me_shutdown is called from the reboot notifier
* it's a simplified version of remove so we go down
* faster.
*/
static void mei_me_shutdown(struct pci_dev *pdev)
{
struct mei_device *dev;
dev = pci_get_drvdata(pdev);
if (!dev)
return;
dev_dbg(&pdev->dev, "shutdown\n");
mei_stop(dev);
mei_me_unset_pm_domain(dev);
mei_disable_interrupts(dev);
free_irq(pdev->irq, dev);
}
/**
* mei_me_remove - Device Removal Routine
*
* @pdev: PCI device structure
*
* mei_me_remove is called by the PCI subsystem to alert the driver
* that it should release a PCI device.
*/
static void mei_me_remove(struct pci_dev *pdev)
{
struct mei_device *dev;
dev = pci_get_drvdata(pdev);
if (!dev)
return;
if (mei_pg_is_enabled(dev))
pm_runtime_get_noresume(&pdev->dev);
dev_dbg(&pdev->dev, "stop\n");
mei_stop(dev);
mei_me_unset_pm_domain(dev);
mei_disable_interrupts(dev);
free_irq(pdev->irq, dev);
mei_deregister(dev);
}
#ifdef CONFIG_PM_SLEEP
static int mei_me_pci_suspend(struct device *device)
{
struct pci_dev *pdev = to_pci_dev(device);
struct mei_device *dev = pci_get_drvdata(pdev);
if (!dev)
return -ENODEV;
dev_dbg(&pdev->dev, "suspend\n");
mei_stop(dev);
mei_disable_interrupts(dev);
free_irq(pdev->irq, dev);
pci_disable_msi(pdev);
return 0;
}
static int mei_me_pci_resume(struct device *device)
{
struct pci_dev *pdev = to_pci_dev(device);
struct mei_device *dev;
unsigned int irqflags;
int err;
dev = pci_get_drvdata(pdev);
if (!dev)
return -ENODEV;
pci_enable_msi(pdev);
irqflags = pci_dev_msi_enabled(pdev) ? IRQF_ONESHOT : IRQF_SHARED;
/* request and enable interrupt */
err = request_threaded_irq(pdev->irq,
mei_me_irq_quick_handler,
mei_me_irq_thread_handler,
irqflags, KBUILD_MODNAME, dev);
if (err) {
dev_err(&pdev->dev, "request_threaded_irq failed: irq = %d.\n",
pdev->irq);
return err;
}
err = mei_restart(dev);
if (err)
return err;
/* Start timer if stopped in suspend */
schedule_delayed_work(&dev->timer_work, HZ);
return 0;
}
#endif /* CONFIG_PM_SLEEP */
#ifdef CONFIG_PM
static int mei_me_pm_runtime_idle(struct device *device)
{
struct mei_device *dev;
dev_dbg(device, "rpm: me: runtime_idle\n");
dev = dev_get_drvdata(device);
if (!dev)
return -ENODEV;
if (mei_write_is_idle(dev))
pm_runtime_autosuspend(device);
return -EBUSY;
}
static int mei_me_pm_runtime_suspend(struct device *device)
{
struct mei_device *dev;
int ret;
dev_dbg(device, "rpm: me: runtime suspend\n");
dev = dev_get_drvdata(device);
if (!dev)
return -ENODEV;
mutex_lock(&dev->device_lock);
if (mei_write_is_idle(dev))
ret = mei_me_pg_enter_sync(dev);
else
ret = -EAGAIN;
mutex_unlock(&dev->device_lock);
dev_dbg(device, "rpm: me: runtime suspend ret=%d\n", ret);
if (ret && ret != -EAGAIN)
schedule_work(&dev->reset_work);
return ret;
}
static int mei_me_pm_runtime_resume(struct device *device)
{
struct mei_device *dev;
int ret;
dev_dbg(device, "rpm: me: runtime resume\n");
dev = dev_get_drvdata(device);
if (!dev)
return -ENODEV;
mutex_lock(&dev->device_lock);
ret = mei_me_pg_exit_sync(dev);
mutex_unlock(&dev->device_lock);
dev_dbg(device, "rpm: me: runtime resume ret = %d\n", ret);
if (ret)
schedule_work(&dev->reset_work);
return ret;
}
/**
* mei_me_set_pm_domain - fill and set pm domain structure for device
*
* @dev: mei_device
*/
static inline void mei_me_set_pm_domain(struct mei_device *dev)
{
struct pci_dev *pdev = to_pci_dev(dev->dev);
if (pdev->dev.bus && pdev->dev.bus->pm) {
dev->pg_domain.ops = *pdev->dev.bus->pm;
dev->pg_domain.ops.runtime_suspend = mei_me_pm_runtime_suspend;
dev->pg_domain.ops.runtime_resume = mei_me_pm_runtime_resume;
dev->pg_domain.ops.runtime_idle = mei_me_pm_runtime_idle;
dev_pm_domain_set(&pdev->dev, &dev->pg_domain);
}
}
/**
* mei_me_unset_pm_domain - clean pm domain structure for device
*
* @dev: mei_device
*/
static inline void mei_me_unset_pm_domain(struct mei_device *dev)
{
/* stop using pm callbacks if any */
dev_pm_domain_set(dev->dev, NULL);
}
static const struct dev_pm_ops mei_me_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(mei_me_pci_suspend,
mei_me_pci_resume)
SET_RUNTIME_PM_OPS(
mei_me_pm_runtime_suspend,
mei_me_pm_runtime_resume,
mei_me_pm_runtime_idle)
};
#define MEI_ME_PM_OPS (&mei_me_pm_ops)
#else
#define MEI_ME_PM_OPS NULL
#endif /* CONFIG_PM */
/*
* PCI driver structure
*/
static struct pci_driver mei_me_driver = {
.name = KBUILD_MODNAME,
.id_table = mei_me_pci_tbl,
.probe = mei_me_probe,
.remove = mei_me_remove,
.shutdown = mei_me_shutdown,
.driver.pm = MEI_ME_PM_OPS,
.driver.probe_type = PROBE_PREFER_ASYNCHRONOUS,
};
module_pci_driver(mei_me_driver);
MODULE_AUTHOR("Intel Corporation");
MODULE_DESCRIPTION("Intel(R) Management Engine Interface");
MODULE_LICENSE("GPL v2");
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