redonkable/alistair23-linux
redonkable/alistair23-linux
1
0
Fork 0
Code Releases Activity
alistair23-linux/drivers/misc/mei/pci-txe.c
Tomeu Vizoso 989561de9b PM / Domains: add setter for dev.pm_domain 
Adds a function that sets the pointer to dev_pm_domain in struct device
and that warns if the device has already finished probing. The reason
why we want to enforce that is because in the general case that can
cause problems and also that we can simplify code quite a bit if we can
always assume that.

This patch also changes all current code that directly sets the
dev.pm_domain pointer.

Signed-off-by: Tomeu Vizoso <tomeu.vizoso@collabora.com>
Reviewed-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2016-01-08 01:12:06 +01:00

438 lines
9.5 KiB
C
Raw Blame History

/*
*
* Intel Management Engine Interface (Intel MEI) Linux driver
* Copyright (c) 2013-2014, 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/module.h>
#include <linux/kernel.h>
#include <linux/device.h>
#include <linux/fs.h>
#include <linux/errno.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/init.h>
#include <linux/sched.h>
#include <linux/uuid.h>
#include <linux/jiffies.h>
#include <linux/interrupt.h>
#include <linux/workqueue.h>
#include <linux/pm_domain.h>
#include <linux/pm_runtime.h>
#include <linux/mei.h>
#include "mei_dev.h"
#include "hw-txe.h"
static const struct pci_device_id mei_txe_pci_tbl[] = {
{PCI_VDEVICE(INTEL, 0x0F18)}, /* Baytrail */
{PCI_VDEVICE(INTEL, 0x2298)}, /* Cherrytrail */
{0, }
};
MODULE_DEVICE_TABLE(pci, mei_txe_pci_tbl);
#ifdef CONFIG_PM
static inline void mei_txe_set_pm_domain(struct mei_device *dev);
static inline void mei_txe_unset_pm_domain(struct mei_device *dev);
#else
static inline void mei_txe_set_pm_domain(struct mei_device *dev) {}
static inline void mei_txe_unset_pm_domain(struct mei_device *dev) {}
#endif /* CONFIG_PM */
static void mei_txe_pci_iounmap(struct pci_dev *pdev, struct mei_txe_hw *hw)
{
int i;
for (i = SEC_BAR; i < NUM_OF_MEM_BARS; i++) {
if (hw->mem_addr[i]) {
pci_iounmap(pdev, hw->mem_addr[i]);
hw->mem_addr[i] = NULL;
}
}
}
/**
* mei_txe_probe - Device Initialization Routine
*
* @pdev: PCI device structure
* @ent: entry in mei_txe_pci_tbl
*
* Return: 0 on success, <0 on failure.
*/
static int mei_txe_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
{
struct mei_device *dev;
struct mei_txe_hw *hw;
int err;
int i;
/* 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;
}
err = pci_set_dma_mask(pdev, DMA_BIT_MASK(36));
if (err) {
err = pci_set_dma_mask(pdev, DMA_BIT_MASK(32));
if (err) {
dev_err(&pdev->dev, "No suitable DMA available.\n");
goto release_regions;
}
}
/* allocates and initializes the mei dev structure */
dev = mei_txe_dev_init(pdev);
if (!dev) {
err = -ENOMEM;
goto release_regions;
}
hw = to_txe_hw(dev);
/* mapping IO device memory */
for (i = SEC_BAR; i < NUM_OF_MEM_BARS; i++) {
hw->mem_addr[i] = pci_iomap(pdev, i, 0);
if (!hw->mem_addr[i]) {
dev_err(&pdev->dev, "mapping I/O device memory failure.\n");
err = -ENOMEM;
goto free_device;
}
}
pci_enable_msi(pdev);
/* clear spurious interrupts */
mei_clear_interrupts(dev);
/* request and enable interrupt */
if (pci_dev_msi_enabled(pdev))
err = request_threaded_irq(pdev->irq,
NULL,
mei_txe_irq_thread_handler,
IRQF_ONESHOT, KBUILD_MODNAME, dev);
else
err = request_threaded_irq(pdev->irq,
mei_txe_irq_quick_handler,
mei_txe_irq_thread_handler,
IRQF_SHARED, KBUILD_MODNAME, dev);
if (err) {
dev_err(&pdev->dev, "mei: request_threaded_irq failure. irq = %d\n",
pdev->irq);
goto free_device;
}
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_TXI_RPM_TIMEOUT);
pm_runtime_use_autosuspend(&pdev->dev);
err = mei_register(dev, &pdev->dev);
if (err)
goto release_irq;
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_txe_set_pm_domain(dev);
pm_runtime_put_noidle(&pdev->dev);
return 0;
release_irq:
mei_cancel_work(dev);
/* disable interrupts */
mei_disable_interrupts(dev);
free_irq(pdev->irq, dev);
pci_disable_msi(pdev);
free_device:
mei_txe_pci_iounmap(pdev, hw);
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_txe_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_txe_remove(struct pci_dev *pdev)
{
struct mei_device *dev;
struct mei_txe_hw *hw;
dev = pci_get_drvdata(pdev);
if (!dev) {
dev_err(&pdev->dev, "mei: dev =NULL\n");
return;
}
pm_runtime_get_noresume(&pdev->dev);
hw = to_txe_hw(dev);
mei_stop(dev);
if (!pci_dev_run_wake(pdev))
mei_txe_unset_pm_domain(dev);
/* disable interrupts */
mei_disable_interrupts(dev);
free_irq(pdev->irq, dev);
pci_disable_msi(pdev);
pci_set_drvdata(pdev, NULL);
mei_txe_pci_iounmap(pdev, hw);
mei_deregister(dev);
kfree(dev);
pci_release_regions(pdev);
pci_disable_device(pdev);
}
#ifdef CONFIG_PM_SLEEP
static int mei_txe_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_txe_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);
mei_clear_interrupts(dev);
/* request and enable interrupt */
if (pci_dev_msi_enabled(pdev))
err = request_threaded_irq(pdev->irq,
NULL,
mei_txe_irq_thread_handler,
IRQF_ONESHOT, KBUILD_MODNAME, dev);
else
err = request_threaded_irq(pdev->irq,
mei_txe_irq_quick_handler,
mei_txe_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);
return err;
}
#endif /* CONFIG_PM_SLEEP */
#ifdef CONFIG_PM
static int mei_txe_pm_runtime_idle(struct device *device)
{
struct pci_dev *pdev = to_pci_dev(device);
struct mei_device *dev;
dev_dbg(&pdev->dev, "rpm: txe: 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_txe_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: txe: 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_txe_aliveness_set_sync(dev, 0);
else
ret = -EAGAIN;
/*
* If everything is okay we're about to enter PCI low
* power state (D3) therefor we need to disable the
* interrupts towards host.
* However if device is not wakeable we do not enter
* D-low state and we need to keep the interrupt kicking
*/
if (!ret && pci_dev_run_wake(pdev))
mei_disable_interrupts(dev);
dev_dbg(&pdev->dev, "rpm: txe: runtime suspend ret=%d\n", ret);
mutex_unlock(&dev->device_lock);
return ret;
}
static int mei_txe_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: txe: runtime resume\n");
dev = pci_get_drvdata(pdev);
if (!dev)
return -ENODEV;
mutex_lock(&dev->device_lock);
mei_enable_interrupts(dev);
ret = mei_txe_aliveness_set_sync(dev, 1);
mutex_unlock(&dev->device_lock);
dev_dbg(&pdev->dev, "rpm: txe: runtime resume ret = %d\n", ret);
return ret;
}
/**
* mei_txe_set_pm_domain - fill and set pm domain structure for device
*
* @dev: mei_device
*/
static inline void mei_txe_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_txe_pm_runtime_suspend;
dev->pg_domain.ops.runtime_resume = mei_txe_pm_runtime_resume;
dev->pg_domain.ops.runtime_idle = mei_txe_pm_runtime_idle;
dev_pm_domain_set(&pdev->dev, &dev->pg_domain);
}
}
/**
* mei_txe_unset_pm_domain - clean pm domain structure for device
*
* @dev: mei_device
*/
static inline void mei_txe_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_txe_pm_ops = {
SET_SYSTEM_SLEEP_PM_OPS(mei_txe_pci_suspend,
mei_txe_pci_resume)
SET_RUNTIME_PM_OPS(
mei_txe_pm_runtime_suspend,
mei_txe_pm_runtime_resume,
mei_txe_pm_runtime_idle)
};
#define MEI_TXE_PM_OPS (&mei_txe_pm_ops)
#else
#define MEI_TXE_PM_OPS NULL
#endif /* CONFIG_PM */
/*
* PCI driver structure
*/
static struct pci_driver mei_txe_driver = {
.name = KBUILD_MODNAME,
.id_table = mei_txe_pci_tbl,
.probe = mei_txe_probe,
.remove = mei_txe_remove,
.shutdown = mei_txe_remove,
.driver.pm = MEI_TXE_PM_OPS,
};
module_pci_driver(mei_txe_driver);
MODULE_AUTHOR("Intel Corporation");
MODULE_DESCRIPTION("Intel(R) Trusted Execution Environment Interface");
MODULE_LICENSE("GPL v2");
View git blame Copy permalink