AuxXxilium/linux_dsm_epyc7002
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linux_dsm_epyc7002/drivers/misc/mei/pci-me.c
Alexander Usyskin 67de6bf1e4 mei: me: enable asynchronous probing 
On some platforms, currently Broxton, Apollo Lake and Kaby Lake,
ME FW may be busy with internal bookkeeping and answering late
to the start message.
As a mitigation, the driver requests for a synchronous probing
to prevent stalling of the overall boot process. For example,
on a Apollo Lake platform the overall boot time has reduced from
~0.9 to ~0.6 seconds on average.

Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2017-07-17 15:07:39 +02:00

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/*
*
* Intel Management Engine Interface (Intel MEI) Linux driver
* Copyright (c) 2003-2012, 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/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/fcntl.h>
#include <linux/pci.h>
#include <linux/poll.h>
#include <linux/ioctl.h>
#include <linux/cdev.h>
#include <linux/sched.h>
#include <linux/uuid.h>
#include <linux/compat.h>
#include <linux/jiffies.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_legacy_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_82G35, mei_me_legacy_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_82Q965, mei_me_legacy_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_82G965, mei_me_legacy_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_82GM965, mei_me_legacy_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_82GME965, mei_me_legacy_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82Q35, mei_me_legacy_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82G33, mei_me_legacy_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82Q33, mei_me_legacy_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_82X38, mei_me_legacy_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_3200, mei_me_legacy_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_6, mei_me_legacy_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_7, mei_me_legacy_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_8, mei_me_legacy_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_9, mei_me_legacy_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9_10, mei_me_legacy_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_1, mei_me_legacy_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_2, mei_me_legacy_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_3, mei_me_legacy_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH9M_4, mei_me_legacy_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_1, mei_me_ich_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_2, mei_me_ich_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_3, mei_me_ich_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_ICH10_4, mei_me_ich_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_IBXPK_1, mei_me_pch_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_IBXPK_2, mei_me_pch_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_pch_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_PPT_2, mei_me_pch_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_PPT_3, mei_me_pch_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_LPT_H, mei_me_pch8_sps_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_LPT_W, mei_me_pch8_sps_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_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_H, mei_me_pch8_sps_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_SPT_H_2, mei_me_pch8_sps_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_LBG, mei_me_pch8_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_KBP, mei_me_pch8_cfg)},
{MEI_PCI_DEVICE(MEI_DEV_ID_KBP_2, 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 */
/**
* 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_cfg *)(ent->driver_data);
struct mei_device *dev;
struct mei_me_hw *hw;
unsigned int irqflags;
int err;
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, cfg);
if (!dev) {
err = -ENOMEM;
goto end;
}
hw = to_me_hw(dev);
hw->mem_addr = pcim_iomap_table(pdev)[0];
pci_enable_msi(pdev);
/* 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);
/*
* For not wake-able HW runtime pm framework
* can't be used on pci device level.
* Use domain runtime pm callbacks instead.
*/
if (!pci_dev_run_wake(pdev))
mei_me_set_pm_domain(dev);
if (mei_pg_is_enabled(dev))
pm_runtime_put_noidle(&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);
if (!pci_dev_run_wake(pdev))
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);
if (!pci_dev_run_wake(pdev))
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 pci_dev *pdev = to_pci_dev(device);
struct mei_device *dev;
dev_dbg(&pdev->dev, "rpm: me: runtime_idle\n");
dev = pci_get_drvdata(pdev);
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 pci_dev *pdev = to_pci_dev(device);
struct mei_device *dev;
int ret;
dev_dbg(&pdev->dev, "rpm: me: runtime suspend\n");
dev = pci_get_drvdata(pdev);
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(&pdev->dev, "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 pci_dev *pdev = to_pci_dev(device);
struct mei_device *dev;
int ret;
dev_dbg(&pdev->dev, "rpm: me: runtime resume\n");
dev = pci_get_drvdata(pdev);
if (!dev)
return -ENODEV;
mutex_lock(&dev->device_lock);
ret = mei_me_pg_exit_sync(dev);
mutex_unlock(&dev->device_lock);
dev_dbg(&pdev->dev, "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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