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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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5c4c0106e9
The shutdown handler quiesces the device, it performs link reset in order to close all connections and notify the device that is not longer managed by the driver. This is essentially a stripped down version of the PCI remove() function where only the necessary amount of work is done to stop any further activity. Signed-off-by: Tomas Winkler <tomas.winkler@intel.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
424 lines
9.3 KiB
C
424 lines
9.3 KiB
C
/*
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*
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* Intel Management Engine Interface (Intel MEI) Linux driver
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* Copyright (c) 2013-2014, Intel Corporation.
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms and conditions of the GNU General Public License,
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* version 2, as published by the Free Software Foundation.
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*
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* This program is distributed in the hope it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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* more details.
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*
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*/
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#include <linux/module.h>
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#include <linux/kernel.h>
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#include <linux/device.h>
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#include <linux/fs.h>
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#include <linux/errno.h>
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#include <linux/types.h>
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#include <linux/pci.h>
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/uuid.h>
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#include <linux/jiffies.h>
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#include <linux/interrupt.h>
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#include <linux/workqueue.h>
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#include <linux/pm_domain.h>
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#include <linux/pm_runtime.h>
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#include <linux/mei.h>
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#include "mei_dev.h"
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#include "hw-txe.h"
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static const struct pci_device_id mei_txe_pci_tbl[] = {
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{PCI_VDEVICE(INTEL, 0x0F18)}, /* Baytrail */
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{PCI_VDEVICE(INTEL, 0x2298)}, /* Cherrytrail */
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{0, }
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};
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MODULE_DEVICE_TABLE(pci, mei_txe_pci_tbl);
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#ifdef CONFIG_PM
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static inline void mei_txe_set_pm_domain(struct mei_device *dev);
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static inline void mei_txe_unset_pm_domain(struct mei_device *dev);
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#else
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static inline void mei_txe_set_pm_domain(struct mei_device *dev) {}
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static inline void mei_txe_unset_pm_domain(struct mei_device *dev) {}
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#endif /* CONFIG_PM */
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/**
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* mei_txe_probe - Device Initialization Routine
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*
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* @pdev: PCI device structure
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* @ent: entry in mei_txe_pci_tbl
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*
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* Return: 0 on success, <0 on failure.
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*/
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static int mei_txe_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
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{
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struct mei_device *dev;
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struct mei_txe_hw *hw;
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const int mask = BIT(SEC_BAR) | BIT(BRIDGE_BAR);
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int err;
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/* enable pci dev */
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err = pcim_enable_device(pdev);
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if (err) {
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dev_err(&pdev->dev, "failed to enable pci device.\n");
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goto end;
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}
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/* set PCI host mastering */
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pci_set_master(pdev);
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/* pci request regions and mapping IO device memory for mei driver */
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err = pcim_iomap_regions(pdev, mask, KBUILD_MODNAME);
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if (err) {
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dev_err(&pdev->dev, "failed to get pci regions.\n");
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goto end;
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}
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err = pci_set_dma_mask(pdev, DMA_BIT_MASK(36));
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if (err) {
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err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
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if (err) {
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dev_err(&pdev->dev, "No suitable DMA available.\n");
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goto end;
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}
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}
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/* allocates and initializes the mei dev structure */
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dev = mei_txe_dev_init(pdev);
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if (!dev) {
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err = -ENOMEM;
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goto end;
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}
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hw = to_txe_hw(dev);
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hw->mem_addr = pcim_iomap_table(pdev);
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pci_enable_msi(pdev);
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/* clear spurious interrupts */
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mei_clear_interrupts(dev);
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/* request and enable interrupt */
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if (pci_dev_msi_enabled(pdev))
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err = request_threaded_irq(pdev->irq,
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NULL,
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mei_txe_irq_thread_handler,
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IRQF_ONESHOT, KBUILD_MODNAME, dev);
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else
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err = request_threaded_irq(pdev->irq,
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mei_txe_irq_quick_handler,
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mei_txe_irq_thread_handler,
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IRQF_SHARED, KBUILD_MODNAME, dev);
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if (err) {
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dev_err(&pdev->dev, "mei: request_threaded_irq failure. irq = %d\n",
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pdev->irq);
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goto end;
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}
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if (mei_start(dev)) {
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dev_err(&pdev->dev, "init hw failure.\n");
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err = -ENODEV;
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goto release_irq;
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}
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pm_runtime_set_autosuspend_delay(&pdev->dev, MEI_TXI_RPM_TIMEOUT);
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pm_runtime_use_autosuspend(&pdev->dev);
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err = mei_register(dev, &pdev->dev);
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if (err)
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goto stop;
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pci_set_drvdata(pdev, dev);
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/*
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* For not wake-able HW runtime pm framework
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* can't be used on pci device level.
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* Use domain runtime pm callbacks instead.
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*/
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if (!pci_dev_run_wake(pdev))
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mei_txe_set_pm_domain(dev);
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pm_runtime_put_noidle(&pdev->dev);
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return 0;
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stop:
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mei_stop(dev);
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release_irq:
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mei_cancel_work(dev);
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mei_disable_interrupts(dev);
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free_irq(pdev->irq, dev);
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end:
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dev_err(&pdev->dev, "initialization failed.\n");
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return err;
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}
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/**
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* mei_txe_remove - Device Shutdown Routine
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*
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* @pdev: PCI device structure
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*
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* mei_txe_shutdown is called from the reboot notifier
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* it's a simplified version of remove so we go down
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* faster.
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*/
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static void mei_txe_shutdown(struct pci_dev *pdev)
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{
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struct mei_device *dev;
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dev = pci_get_drvdata(pdev);
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if (!dev)
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return;
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dev_dbg(&pdev->dev, "shutdown\n");
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mei_stop(dev);
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if (!pci_dev_run_wake(pdev))
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mei_txe_unset_pm_domain(dev);
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mei_disable_interrupts(dev);
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free_irq(pdev->irq, dev);
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}
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/**
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* mei_txe_remove - Device Removal Routine
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*
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* @pdev: PCI device structure
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*
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* mei_remove is called by the PCI subsystem to alert the driver
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* that it should release a PCI device.
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*/
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static void mei_txe_remove(struct pci_dev *pdev)
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{
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struct mei_device *dev;
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dev = pci_get_drvdata(pdev);
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if (!dev) {
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dev_err(&pdev->dev, "mei: dev == NULL\n");
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return;
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}
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pm_runtime_get_noresume(&pdev->dev);
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mei_stop(dev);
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if (!pci_dev_run_wake(pdev))
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mei_txe_unset_pm_domain(dev);
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mei_disable_interrupts(dev);
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free_irq(pdev->irq, dev);
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mei_deregister(dev);
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}
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#ifdef CONFIG_PM_SLEEP
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static int mei_txe_pci_suspend(struct device *device)
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{
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struct pci_dev *pdev = to_pci_dev(device);
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struct mei_device *dev = pci_get_drvdata(pdev);
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if (!dev)
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return -ENODEV;
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dev_dbg(&pdev->dev, "suspend\n");
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mei_stop(dev);
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mei_disable_interrupts(dev);
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free_irq(pdev->irq, dev);
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pci_disable_msi(pdev);
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return 0;
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}
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static int mei_txe_pci_resume(struct device *device)
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{
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struct pci_dev *pdev = to_pci_dev(device);
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struct mei_device *dev;
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int err;
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dev = pci_get_drvdata(pdev);
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if (!dev)
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return -ENODEV;
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pci_enable_msi(pdev);
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mei_clear_interrupts(dev);
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/* request and enable interrupt */
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if (pci_dev_msi_enabled(pdev))
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err = request_threaded_irq(pdev->irq,
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NULL,
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mei_txe_irq_thread_handler,
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IRQF_ONESHOT, KBUILD_MODNAME, dev);
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else
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err = request_threaded_irq(pdev->irq,
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mei_txe_irq_quick_handler,
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mei_txe_irq_thread_handler,
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IRQF_SHARED, KBUILD_MODNAME, dev);
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if (err) {
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dev_err(&pdev->dev, "request_threaded_irq failed: irq = %d.\n",
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pdev->irq);
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return err;
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}
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err = mei_restart(dev);
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return err;
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}
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#endif /* CONFIG_PM_SLEEP */
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#ifdef CONFIG_PM
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static int mei_txe_pm_runtime_idle(struct device *device)
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{
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struct pci_dev *pdev = to_pci_dev(device);
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struct mei_device *dev;
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dev_dbg(&pdev->dev, "rpm: txe: runtime_idle\n");
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dev = pci_get_drvdata(pdev);
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if (!dev)
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return -ENODEV;
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if (mei_write_is_idle(dev))
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pm_runtime_autosuspend(device);
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return -EBUSY;
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}
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static int mei_txe_pm_runtime_suspend(struct device *device)
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{
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struct pci_dev *pdev = to_pci_dev(device);
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struct mei_device *dev;
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int ret;
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dev_dbg(&pdev->dev, "rpm: txe: runtime suspend\n");
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dev = pci_get_drvdata(pdev);
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if (!dev)
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return -ENODEV;
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mutex_lock(&dev->device_lock);
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if (mei_write_is_idle(dev))
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ret = mei_txe_aliveness_set_sync(dev, 0);
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else
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ret = -EAGAIN;
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/*
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* If everything is okay we're about to enter PCI low
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* power state (D3) therefor we need to disable the
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* interrupts towards host.
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* However if device is not wakeable we do not enter
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* D-low state and we need to keep the interrupt kicking
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*/
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if (!ret && pci_dev_run_wake(pdev))
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mei_disable_interrupts(dev);
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dev_dbg(&pdev->dev, "rpm: txe: runtime suspend ret=%d\n", ret);
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mutex_unlock(&dev->device_lock);
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if (ret && ret != -EAGAIN)
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schedule_work(&dev->reset_work);
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return ret;
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}
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static int mei_txe_pm_runtime_resume(struct device *device)
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{
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struct pci_dev *pdev = to_pci_dev(device);
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struct mei_device *dev;
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int ret;
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dev_dbg(&pdev->dev, "rpm: txe: runtime resume\n");
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dev = pci_get_drvdata(pdev);
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if (!dev)
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return -ENODEV;
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mutex_lock(&dev->device_lock);
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mei_enable_interrupts(dev);
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ret = mei_txe_aliveness_set_sync(dev, 1);
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mutex_unlock(&dev->device_lock);
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dev_dbg(&pdev->dev, "rpm: txe: runtime resume ret = %d\n", ret);
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if (ret)
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schedule_work(&dev->reset_work);
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return ret;
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}
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/**
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* mei_txe_set_pm_domain - fill and set pm domain structure for device
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*
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* @dev: mei_device
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*/
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static inline void mei_txe_set_pm_domain(struct mei_device *dev)
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{
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struct pci_dev *pdev = to_pci_dev(dev->dev);
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if (pdev->dev.bus && pdev->dev.bus->pm) {
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dev->pg_domain.ops = *pdev->dev.bus->pm;
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dev->pg_domain.ops.runtime_suspend = mei_txe_pm_runtime_suspend;
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dev->pg_domain.ops.runtime_resume = mei_txe_pm_runtime_resume;
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dev->pg_domain.ops.runtime_idle = mei_txe_pm_runtime_idle;
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dev_pm_domain_set(&pdev->dev, &dev->pg_domain);
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}
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}
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/**
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* mei_txe_unset_pm_domain - clean pm domain structure for device
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*
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* @dev: mei_device
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*/
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static inline void mei_txe_unset_pm_domain(struct mei_device *dev)
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{
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/* stop using pm callbacks if any */
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dev_pm_domain_set(dev->dev, NULL);
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}
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static const struct dev_pm_ops mei_txe_pm_ops = {
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SET_SYSTEM_SLEEP_PM_OPS(mei_txe_pci_suspend,
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mei_txe_pci_resume)
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SET_RUNTIME_PM_OPS(
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mei_txe_pm_runtime_suspend,
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mei_txe_pm_runtime_resume,
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mei_txe_pm_runtime_idle)
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};
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#define MEI_TXE_PM_OPS (&mei_txe_pm_ops)
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#else
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#define MEI_TXE_PM_OPS NULL
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#endif /* CONFIG_PM */
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/*
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* PCI driver structure
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*/
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static struct pci_driver mei_txe_driver = {
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.name = KBUILD_MODNAME,
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.id_table = mei_txe_pci_tbl,
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.probe = mei_txe_probe,
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.remove = mei_txe_remove,
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.shutdown = mei_txe_shutdown,
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.driver.pm = MEI_TXE_PM_OPS,
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};
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module_pci_driver(mei_txe_driver);
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MODULE_AUTHOR("Intel Corporation");
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MODULE_DESCRIPTION("Intel(R) Trusted Execution Environment Interface");
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MODULE_LICENSE("GPL v2");
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