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linux-stable/drivers/misc/mei/pci-me.c
Tomas Winkler 33ec082631 mei: revamp mei reset state machine 
1. MEI_DEV_RESETTING device state spans only hardware reset flow
while starting dev state is saved into a local variable for further
reference, this let us to reduce big if statements in case we
are trying to avoid nested resets

2. During initializations if the reset ended in MEI_DEV_DISABLED device
state we bail out with -ENODEV

3. Remove redundant interrupts_enabled parameter as this
 can be deduced from the starting dev_state

4. mei_reset propagates error code to the caller

5. Add mei_restart function to wrap the pci resume

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Alexander Usyskin <alexander.usyskin@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2014-01-13 14:57:21 -08:00

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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.
*
*/
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
#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/aio.h>
#include <linux/pci.h>
#include <linux/poll.h>
#include <linux/init.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/miscdevice.h>
#include <linux/mei.h>
#include "mei_dev.h"
#include "hw-me.h"
#include "client.h"
/* mei_pci_tbl - PCI Device ID Table */
static DEFINE_PCI_DEVICE_TABLE(mei_me_pci_tbl) = {
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82946GZ)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82G35)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82Q965)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82G965)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82GM965)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_82GME965)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82Q35)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82G33)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82Q33)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_82X38)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_3200)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_6)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_7)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_8)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_9)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9_10)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_1)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_2)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_3)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH9M_4)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_1)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_2)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_3)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_ICH10_4)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_IBXPK_1)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_IBXPK_2)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_CPT_1)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PBG_1)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_1)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_2)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_PPT_3)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_LPT_H)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_LPT_W)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_LPT_LP)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_LPT_HR)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MEI_DEV_ID_WPT_LP)},
/* required last entry */
{0, }
};
MODULE_DEVICE_TABLE(pci, mei_me_pci_tbl);
/**
* mei_quirk_probe - probe for devices that doesn't valid ME interface
*
* @pdev: PCI device structure
* @ent: entry into pci_device_table
*
* returns true if ME Interface is valid, false otherwise
*/
static bool mei_me_quirk_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
u32 reg;
if (ent->device == MEI_DEV_ID_PBG_1) {
pci_read_config_dword(pdev, 0x48, &reg);
/* make sure that bit 9 is up and bit 10 is down */
if ((reg & 0x600) == 0x200) {
dev_info(&pdev->dev, "Device doesn't have valid ME Interface\n");
return false;
}
}
return true;
}
/**
* mei_probe - Device Initialization Routine
*
* @pdev: PCI device structure
* @ent: entry in kcs_pci_tbl
*
* returns 0 on success, <0 on failure.
*/
static int mei_me_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
struct mei_device *dev;
struct mei_me_hw *hw;
int err;
if (!mei_me_quirk_probe(pdev, ent)) {
err = -ENODEV;
goto end;
}
/* enable pci dev */
err = pci_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 for mei driver */
err = pci_request_regions(pdev, KBUILD_MODNAME);
if (err) {
dev_err(&pdev->dev, "failed to get pci regions.\n");
goto disable_device;
}
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 release_regions;
}
/* allocates and initializes the mei dev structure */
dev = mei_me_dev_init(pdev);
if (!dev) {
err = -ENOMEM;
goto release_regions;
}
hw = to_me_hw(dev);
/* mapping IO device memory */
hw->mem_addr = pci_iomap(pdev, 0, 0);
if (!hw->mem_addr) {
dev_err(&pdev->dev, "mapping I/O device memory failure.\n");
err = -ENOMEM;
goto free_device;
}
pci_enable_msi(pdev);
/* request and enable interrupt */
if (pci_dev_msi_enabled(pdev))
err = request_threaded_irq(pdev->irq,
NULL,
mei_me_irq_thread_handler,
IRQF_ONESHOT, KBUILD_MODNAME, dev);
else
err = request_threaded_irq(pdev->irq,
mei_me_irq_quick_handler,
mei_me_irq_thread_handler,
IRQF_SHARED, KBUILD_MODNAME, dev);
if (err) {
dev_err(&pdev->dev, "request_threaded_irq failure. irq = %d\n",
pdev->irq);
goto disable_msi;
}
if (mei_start(dev)) {
dev_err(&pdev->dev, "init hw failure.\n");
err = -ENODEV;
goto release_irq;
}
err = mei_register(dev);
if (err)
goto release_irq;
pci_set_drvdata(pdev, dev);
schedule_delayed_work(&dev->timer_work, HZ);
dev_dbg(&pdev->dev, "initialization successful.\n");
return 0;
release_irq:
mei_cancel_work(dev);
mei_disable_interrupts(dev);
free_irq(pdev->irq, dev);
disable_msi:
pci_disable_msi(pdev);
pci_iounmap(pdev, hw->mem_addr);
free_device:
kfree(dev);
release_regions:
pci_release_regions(pdev);
disable_device:
pci_disable_device(pdev);
end:
dev_err(&pdev->dev, "initialization failed.\n");
return err;
}
/**
* mei_remove - Device Removal Routine
*
* @pdev: PCI device structure
*
* mei_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;
struct mei_me_hw *hw;
dev = pci_get_drvdata(pdev);
if (!dev)
return;
hw = to_me_hw(dev);
dev_dbg(&pdev->dev, "stop\n");
mei_stop(dev);
/* disable interrupts */
mei_disable_interrupts(dev);
free_irq(pdev->irq, dev);
pci_disable_msi(pdev);
if (hw->mem_addr)
pci_iounmap(pdev, hw->mem_addr);
mei_deregister(dev);
kfree(dev);
pci_release_regions(pdev);
pci_disable_device(pdev);
}
#ifdef CONFIG_PM
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;
int err;
dev = pci_get_drvdata(pdev);
if (!dev)
return -ENODEV;
pci_enable_msi(pdev);
/* request and enable interrupt */
if (pci_dev_msi_enabled(pdev))
err = request_threaded_irq(pdev->irq,
NULL,
mei_me_irq_thread_handler,
IRQF_ONESHOT, KBUILD_MODNAME, dev);
else
err = request_threaded_irq(pdev->irq,
mei_me_irq_quick_handler,
mei_me_irq_thread_handler,
IRQF_SHARED, 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;
}
static SIMPLE_DEV_PM_OPS(mei_me_pm_ops, mei_me_pci_suspend, mei_me_pci_resume);
#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_remove,
.driver.pm = MEI_ME_PM_OPS,
};
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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