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linux/drivers/misc/mic/host/mic_main.c
Linus Torvalds 0324e74534 Driver Core / sysfs patches for 3.13-rc1 
Here's the big driver core / sysfs update for 3.13-rc1.
 
 There's lots of dev_groups updates for different subsystems, as they all
 get slowly migrated over to the safe versions of the attribute groups
 (removing userspace races with the creation of the sysfs files.)  Also
 in here are some kobject updates, devres expansions, and the first round
 of Tejun's sysfs reworking to enable it to be used by other subsystems
 as a backend for an in-kernel filesystem.
 
 All of these have been in linux-next for a while with no reported
 issues.
 
 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Merge tag 'driver-core-3.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core

Pull driver core / sysfs patches from Greg KH:
 "Here's the big driver core / sysfs update for 3.13-rc1.

  There's lots of dev_groups updates for different subsystems, as they
  all get slowly migrated over to the safe versions of the attribute
  groups (removing userspace races with the creation of the sysfs
  files.) Also in here are some kobject updates, devres expansions, and
  the first round of Tejun's sysfs reworking to enable it to be used by
  other subsystems as a backend for an in-kernel filesystem.

  All of these have been in linux-next for a while with no reported
  issues"

* tag 'driver-core-3.13-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/driver-core: (83 commits)
  sysfs: rename sysfs_assoc_lock and explain what it's about
  sysfs: use generic_file_llseek() for sysfs_file_operations
  sysfs: return correct error code on unimplemented mmap()
  mdio_bus: convert bus code to use dev_groups
  device: Make dev_WARN/dev_WARN_ONCE print device as well as driver name
  sysfs: separate out dup filename warning into a separate function
  sysfs: move sysfs_hash_and_remove() to fs/sysfs/dir.c
  sysfs: remove unused sysfs_get_dentry() prototype
  sysfs: honor bin_attr.attr.ignore_lockdep
  sysfs: merge sysfs_elem_bin_attr into sysfs_elem_attr
  devres: restore zeroing behavior of devres_alloc()
  sysfs: fix sysfs_write_file for bin file
  input: gameport: convert bus code to use dev_groups
  input: serio: remove bus usage of dev_attrs
  input: serio: use DEVICE_ATTR_RO()
  i2o: convert bus code to use dev_groups
  memstick: convert bus code to use dev_groups
  tifm: convert bus code to use dev_groups
  virtio: convert bus code to use dev_groups
  ipack: convert bus code to use dev_groups
  ...
2013-11-07 11:42:15 +09:00

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/*
* Intel MIC Platform Software Stack (MPSS)
*
* Copyright(c) 2013 Intel Corporation.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that 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.
*
* The full GNU General Public License is included in this distribution in
* the file called "COPYING".
*
* Intel MIC Host driver.
*
* Global TODO's across the driver to be added after initial base
* patches are accepted upstream:
* 1) Enable DMA support.
* 2) Enable per vring interrupt support.
*/
#include <linux/fs.h>
#include <linux/module.h>
#include <linux/pci.h>
#include <linux/poll.h>
#include <linux/suspend.h>
#include <linux/mic_common.h>
#include "../common/mic_dev.h"
#include "mic_device.h"
#include "mic_x100.h"
#include "mic_smpt.h"
#include "mic_fops.h"
#include "mic_virtio.h"
static const char mic_driver_name[] = "mic";
static DEFINE_PCI_DEVICE_TABLE(mic_pci_tbl) = {
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2250)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2251)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2252)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2253)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2254)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2255)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2256)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2257)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2258)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_2259)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_225a)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_225b)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_225c)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_225d)},
{PCI_DEVICE(PCI_VENDOR_ID_INTEL, MIC_X100_PCI_DEVICE_225e)},
/* required last entry */
{ 0, }
};
MODULE_DEVICE_TABLE(pci, mic_pci_tbl);
/* ID allocator for MIC devices */
static struct ida g_mic_ida;
/* Class of MIC devices for sysfs accessibility. */
static struct class *g_mic_class;
/* Base device node number for MIC devices */
static dev_t g_mic_devno;
static const struct file_operations mic_fops = {
.open = mic_open,
.release = mic_release,
.unlocked_ioctl = mic_ioctl,
.poll = mic_poll,
.mmap = mic_mmap,
.owner = THIS_MODULE,
};
/* Initialize the device page */
static int mic_dp_init(struct mic_device *mdev)
{
mdev->dp = kzalloc(MIC_DP_SIZE, GFP_KERNEL);
if (!mdev->dp) {
dev_err(mdev->sdev->parent, "%s %d err %d\n",
__func__, __LINE__, -ENOMEM);
return -ENOMEM;
}
mdev->dp_dma_addr = mic_map_single(mdev,
mdev->dp, MIC_DP_SIZE);
if (mic_map_error(mdev->dp_dma_addr)) {
kfree(mdev->dp);
dev_err(mdev->sdev->parent, "%s %d err %d\n",
__func__, __LINE__, -ENOMEM);
return -ENOMEM;
}
mdev->ops->write_spad(mdev, MIC_DPLO_SPAD, mdev->dp_dma_addr);
mdev->ops->write_spad(mdev, MIC_DPHI_SPAD, mdev->dp_dma_addr >> 32);
return 0;
}
/* Uninitialize the device page */
static void mic_dp_uninit(struct mic_device *mdev)
{
mic_unmap_single(mdev, mdev->dp_dma_addr, MIC_DP_SIZE);
kfree(mdev->dp);
}
/**
* mic_shutdown_db - Shutdown doorbell interrupt handler.
*/
static irqreturn_t mic_shutdown_db(int irq, void *data)
{
struct mic_device *mdev = data;
struct mic_bootparam *bootparam = mdev->dp;
mdev->ops->ack_interrupt(mdev);
switch (bootparam->shutdown_status) {
case MIC_HALTED:
case MIC_POWER_OFF:
case MIC_RESTART:
/* Fall through */
case MIC_CRASHED:
schedule_work(&mdev->shutdown_work);
break;
default:
break;
};
return IRQ_HANDLED;
}
/**
* mic_ops_init: Initialize HW specific operation tables.
*
* @mdev: pointer to mic_device instance
*
* returns none.
*/
static void mic_ops_init(struct mic_device *mdev)
{
switch (mdev->family) {
case MIC_FAMILY_X100:
mdev->ops = &mic_x100_ops;
mdev->intr_ops = &mic_x100_intr_ops;
mdev->smpt_ops = &mic_x100_smpt_ops;
break;
default:
break;
}
}
/**
* mic_get_family - Determine hardware family to which this MIC belongs.
*
* @pdev: The pci device structure
*
* returns family.
*/
static enum mic_hw_family mic_get_family(struct pci_dev *pdev)
{
enum mic_hw_family family;
switch (pdev->device) {
case MIC_X100_PCI_DEVICE_2250:
case MIC_X100_PCI_DEVICE_2251:
case MIC_X100_PCI_DEVICE_2252:
case MIC_X100_PCI_DEVICE_2253:
case MIC_X100_PCI_DEVICE_2254:
case MIC_X100_PCI_DEVICE_2255:
case MIC_X100_PCI_DEVICE_2256:
case MIC_X100_PCI_DEVICE_2257:
case MIC_X100_PCI_DEVICE_2258:
case MIC_X100_PCI_DEVICE_2259:
case MIC_X100_PCI_DEVICE_225a:
case MIC_X100_PCI_DEVICE_225b:
case MIC_X100_PCI_DEVICE_225c:
case MIC_X100_PCI_DEVICE_225d:
case MIC_X100_PCI_DEVICE_225e:
family = MIC_FAMILY_X100;
break;
default:
family = MIC_FAMILY_UNKNOWN;
break;
}
return family;
}
/**
* mic_pm_notifier: Notifier callback function that handles
* PM notifications.
*
* @notifier_block: The notifier structure.
* @pm_event: The event for which the driver was notified.
* @unused: Meaningless. Always NULL.
*
* returns NOTIFY_DONE
*/
static int mic_pm_notifier(struct notifier_block *notifier,
unsigned long pm_event, void *unused)
{
struct mic_device *mdev = container_of(notifier,
struct mic_device, pm_notifier);
switch (pm_event) {
case PM_HIBERNATION_PREPARE:
/* Fall through */
case PM_SUSPEND_PREPARE:
mic_prepare_suspend(mdev);
break;
case PM_POST_HIBERNATION:
/* Fall through */
case PM_POST_SUSPEND:
/* Fall through */
case PM_POST_RESTORE:
mic_complete_resume(mdev);
break;
case PM_RESTORE_PREPARE:
break;
default:
break;
}
return NOTIFY_DONE;
}
/**
* mic_device_init - Allocates and initializes the MIC device structure
*
* @mdev: pointer to mic_device instance
* @pdev: The pci device structure
*
* returns none.
*/
static int
mic_device_init(struct mic_device *mdev, struct pci_dev *pdev)
{
int rc;
mdev->family = mic_get_family(pdev);
mdev->stepping = pdev->revision;
mic_ops_init(mdev);
mic_sysfs_init(mdev);
mutex_init(&mdev->mic_mutex);
mdev->irq_info.next_avail_src = 0;
INIT_WORK(&mdev->reset_trigger_work, mic_reset_trigger_work);
INIT_WORK(&mdev->shutdown_work, mic_shutdown_work);
init_completion(&mdev->reset_wait);
INIT_LIST_HEAD(&mdev->vdev_list);
mdev->pm_notifier.notifier_call = mic_pm_notifier;
rc = register_pm_notifier(&mdev->pm_notifier);
if (rc) {
dev_err(&pdev->dev, "register_pm_notifier failed rc %d\n",
rc);
goto register_pm_notifier_fail;
}
return 0;
register_pm_notifier_fail:
flush_work(&mdev->shutdown_work);
flush_work(&mdev->reset_trigger_work);
return rc;
}
/**
* mic_device_uninit - Frees resources allocated during mic_device_init(..)
*
* @mdev: pointer to mic_device instance
*
* returns none
*/
static void mic_device_uninit(struct mic_device *mdev)
{
/* The cmdline sysfs entry might have allocated cmdline */
kfree(mdev->cmdline);
kfree(mdev->firmware);
kfree(mdev->ramdisk);
kfree(mdev->bootmode);
flush_work(&mdev->reset_trigger_work);
flush_work(&mdev->shutdown_work);
unregister_pm_notifier(&mdev->pm_notifier);
}
/**
* mic_probe - Device Initialization Routine
*
* @pdev: PCI device structure
* @ent: entry in mic_pci_tbl
*
* returns 0 on success, < 0 on failure.
*/
static int mic_probe(struct pci_dev *pdev,
const struct pci_device_id *ent)
{
int rc;
struct mic_device *mdev;
mdev = kzalloc(sizeof(*mdev), GFP_KERNEL);
if (!mdev) {
rc = -ENOMEM;
dev_err(&pdev->dev, "mdev kmalloc failed rc %d\n", rc);
goto mdev_alloc_fail;
}
mdev->id = ida_simple_get(&g_mic_ida, 0, MIC_MAX_NUM_DEVS, GFP_KERNEL);
if (mdev->id < 0) {
rc = mdev->id;
dev_err(&pdev->dev, "ida_simple_get failed rc %d\n", rc);
goto ida_fail;
}
rc = mic_device_init(mdev, pdev);
if (rc) {
dev_err(&pdev->dev, "mic_device_init failed rc %d\n", rc);
goto device_init_fail;
}
rc = pci_enable_device(pdev);
if (rc) {
dev_err(&pdev->dev, "failed to enable pci device.\n");
goto uninit_device;
}
pci_set_master(pdev);
rc = pci_request_regions(pdev, mic_driver_name);
if (rc) {
dev_err(&pdev->dev, "failed to get pci regions.\n");
goto disable_device;
}
rc = pci_set_dma_mask(pdev, DMA_BIT_MASK(64));
if (rc) {
dev_err(&pdev->dev, "Cannot set DMA mask\n");
goto release_regions;
}
mdev->mmio.pa = pci_resource_start(pdev, mdev->ops->mmio_bar);
mdev->mmio.len = pci_resource_len(pdev, mdev->ops->mmio_bar);
mdev->mmio.va = pci_ioremap_bar(pdev, mdev->ops->mmio_bar);
if (!mdev->mmio.va) {
dev_err(&pdev->dev, "Cannot remap MMIO BAR\n");
rc = -EIO;
goto release_regions;
}
mdev->aper.pa = pci_resource_start(pdev, mdev->ops->aper_bar);
mdev->aper.len = pci_resource_len(pdev, mdev->ops->aper_bar);
mdev->aper.va = ioremap_wc(mdev->aper.pa, mdev->aper.len);
if (!mdev->aper.va) {
dev_err(&pdev->dev, "Cannot remap Aperture BAR\n");
rc = -EIO;
goto unmap_mmio;
}
mdev->intr_ops->intr_init(mdev);
rc = mic_setup_interrupts(mdev, pdev);
if (rc) {
dev_err(&pdev->dev, "mic_setup_interrupts failed %d\n", rc);
goto unmap_aper;
}
rc = mic_smpt_init(mdev);
if (rc) {
dev_err(&pdev->dev, "smpt_init failed %d\n", rc);
goto free_interrupts;
}
pci_set_drvdata(pdev, mdev);
mdev->sdev = device_create_with_groups(g_mic_class, &pdev->dev,
MKDEV(MAJOR(g_mic_devno), mdev->id), NULL,
mdev->attr_group, "mic%d", mdev->id);
if (IS_ERR(mdev->sdev)) {
rc = PTR_ERR(mdev->sdev);
dev_err(&pdev->dev,
"device_create_with_groups failed rc %d\n", rc);
goto smpt_uninit;
}
mdev->state_sysfs = sysfs_get_dirent(mdev->sdev->kobj.sd, "state");
if (!mdev->state_sysfs) {
rc = -ENODEV;
dev_err(&pdev->dev, "sysfs_get_dirent failed rc %d\n", rc);
goto destroy_device;
}
rc = mic_dp_init(mdev);
if (rc) {
dev_err(&pdev->dev, "mic_dp_init failed rc %d\n", rc);
goto sysfs_put;
}
mutex_lock(&mdev->mic_mutex);
mdev->shutdown_db = mic_next_db(mdev);
mdev->shutdown_cookie = mic_request_irq(mdev, mic_shutdown_db,
"shutdown-interrupt", mdev, mdev->shutdown_db, MIC_INTR_DB);
if (IS_ERR(mdev->shutdown_cookie)) {
rc = PTR_ERR(mdev->shutdown_cookie);
mutex_unlock(&mdev->mic_mutex);
goto dp_uninit;
}
mutex_unlock(&mdev->mic_mutex);
mic_bootparam_init(mdev);
mic_create_debug_dir(mdev);
cdev_init(&mdev->cdev, &mic_fops);
mdev->cdev.owner = THIS_MODULE;
rc = cdev_add(&mdev->cdev, MKDEV(MAJOR(g_mic_devno), mdev->id), 1);
if (rc) {
dev_err(&pdev->dev, "cdev_add err id %d rc %d\n", mdev->id, rc);
goto cleanup_debug_dir;
}
return 0;
cleanup_debug_dir:
mic_delete_debug_dir(mdev);
mutex_lock(&mdev->mic_mutex);
mic_free_irq(mdev, mdev->shutdown_cookie, mdev);
mutex_unlock(&mdev->mic_mutex);
dp_uninit:
mic_dp_uninit(mdev);
sysfs_put:
sysfs_put(mdev->state_sysfs);
destroy_device:
device_destroy(g_mic_class, MKDEV(MAJOR(g_mic_devno), mdev->id));
smpt_uninit:
mic_smpt_uninit(mdev);
free_interrupts:
mic_free_interrupts(mdev, pdev);
unmap_aper:
iounmap(mdev->aper.va);
unmap_mmio:
iounmap(mdev->mmio.va);
release_regions:
pci_release_regions(pdev);
disable_device:
pci_disable_device(pdev);
uninit_device:
mic_device_uninit(mdev);
device_init_fail:
ida_simple_remove(&g_mic_ida, mdev->id);
ida_fail:
kfree(mdev);
mdev_alloc_fail:
dev_err(&pdev->dev, "Probe failed rc %d\n", rc);
return rc;
}
/**
* mic_remove - Device Removal Routine
* mic_remove is called by the PCI subsystem to alert the driver
* that it should release a PCI device.
*
* @pdev: PCI device structure
*/
static void mic_remove(struct pci_dev *pdev)
{
struct mic_device *mdev;
mdev = pci_get_drvdata(pdev);
if (!mdev)
return;
mic_stop(mdev, false);
cdev_del(&mdev->cdev);
mic_delete_debug_dir(mdev);
mutex_lock(&mdev->mic_mutex);
mic_free_irq(mdev, mdev->shutdown_cookie, mdev);
mutex_unlock(&mdev->mic_mutex);
flush_work(&mdev->shutdown_work);
mic_dp_uninit(mdev);
sysfs_put(mdev->state_sysfs);
device_destroy(g_mic_class, MKDEV(MAJOR(g_mic_devno), mdev->id));
mic_smpt_uninit(mdev);
mic_free_interrupts(mdev, pdev);
iounmap(mdev->mmio.va);
iounmap(mdev->aper.va);
mic_device_uninit(mdev);
pci_release_regions(pdev);
pci_disable_device(pdev);
ida_simple_remove(&g_mic_ida, mdev->id);
kfree(mdev);
}
static struct pci_driver mic_driver = {
.name = mic_driver_name,
.id_table = mic_pci_tbl,
.probe = mic_probe,
.remove = mic_remove
};
static int __init mic_init(void)
{
int ret;
ret = alloc_chrdev_region(&g_mic_devno, 0,
MIC_MAX_NUM_DEVS, mic_driver_name);
if (ret) {
pr_err("alloc_chrdev_region failed ret %d\n", ret);
goto error;
}
g_mic_class = class_create(THIS_MODULE, mic_driver_name);
if (IS_ERR(g_mic_class)) {
ret = PTR_ERR(g_mic_class);
pr_err("class_create failed ret %d\n", ret);
goto cleanup_chrdev;
}
mic_init_debugfs();
ida_init(&g_mic_ida);
ret = pci_register_driver(&mic_driver);
if (ret) {
pr_err("pci_register_driver failed ret %d\n", ret);
goto cleanup_debugfs;
}
return ret;
cleanup_debugfs:
mic_exit_debugfs();
class_destroy(g_mic_class);
cleanup_chrdev:
unregister_chrdev_region(g_mic_devno, MIC_MAX_NUM_DEVS);
error:
return ret;
}
static void __exit mic_exit(void)
{
pci_unregister_driver(&mic_driver);
ida_destroy(&g_mic_ida);
mic_exit_debugfs();
class_destroy(g_mic_class);
unregister_chrdev_region(g_mic_devno, MIC_MAX_NUM_DEVS);
}
module_init(mic_init);
module_exit(mic_exit);
MODULE_AUTHOR("Intel Corporation");
MODULE_DESCRIPTION("Intel(R) MIC X100 Host driver");
MODULE_LICENSE("GPL v2");
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