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device-init.c

/*
 *  PS3 device registration routines.
 *
 *  Copyright (C) 2007 Sony Computer Entertainment Inc.
 *  Copyright 2007 Sony Corp.
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; version 2 of the License.
 *
 *  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.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#include <linux/delay.h>
#include <linux/freezer.h>
#include <linux/kernel.h>
#include <linux/kthread.h>
#include <linux/init.h>
#include <linux/reboot.h>

#include <asm/firmware.h>
#include <asm/lv1call.h>
#include <asm/ps3stor.h>

#include "platform.h"

static int __init ps3_register_lpm_devices(void)
{
      int result;
      u64 tmp1;
      u64 tmp2;
      struct ps3_system_bus_device *dev;

      pr_debug(" -> %s:%d\n", __func__, __LINE__);

      dev = kzalloc(sizeof(*dev), GFP_KERNEL);
      if (!dev)
            return -ENOMEM;

      dev->match_id = PS3_MATCH_ID_LPM;
      dev->dev_type = PS3_DEVICE_TYPE_LPM;

      /* The current lpm driver only supports a single BE processor. */

      result = ps3_repository_read_be_node_id(0, &dev->lpm.node_id);

      if (result) {
            pr_debug("%s:%d: ps3_repository_read_be_node_id failed \n",
                  __func__, __LINE__);
            goto fail_read_repo;
      }

      result = ps3_repository_read_lpm_privileges(dev->lpm.node_id, &tmp1,
            &dev->lpm.rights);

      if (result) {
            pr_debug("%s:%d: ps3_repository_read_lpm_privleges failed \n",
                  __func__, __LINE__);
            goto fail_read_repo;
      }

      lv1_get_logical_partition_id(&tmp2);

      if (tmp1 != tmp2) {
            pr_debug("%s:%d: wrong lpar\n",
                  __func__, __LINE__);
            result = -ENODEV;
            goto fail_rights;
      }

      if (!(dev->lpm.rights & PS3_LPM_RIGHTS_USE_LPM)) {
            pr_debug("%s:%d: don't have rights to use lpm\n",
                  __func__, __LINE__);
            result = -EPERM;
            goto fail_rights;
      }

      pr_debug("%s:%d: pu_id %lu, rights %lu(%lxh)\n",
            __func__, __LINE__, dev->lpm.pu_id, dev->lpm.rights,
            dev->lpm.rights);

      result = ps3_repository_read_pu_id(0, &dev->lpm.pu_id);

      if (result) {
            pr_debug("%s:%d: ps3_repository_read_pu_id failed \n",
                  __func__, __LINE__);
            goto fail_read_repo;
      }

      result = ps3_system_bus_device_register(dev);

      if (result) {
            pr_debug("%s:%d ps3_system_bus_device_register failed\n",
                  __func__, __LINE__);
            goto fail_register;
      }

      pr_debug(" <- %s:%d\n", __func__, __LINE__);
      return 0;


fail_register:
fail_rights:
fail_read_repo:
      kfree(dev);
      pr_debug(" <- %s:%d: failed\n", __func__, __LINE__);
      return result;
}

/**
 * ps3_setup_gelic_device - Setup and register a gelic device instance.
 *
 * Allocates memory for a struct ps3_system_bus_device instance, initialises the
 * structure members, and registers the device instance with the system bus.
 */

static int __init ps3_setup_gelic_device(
      const struct ps3_repository_device *repo)
{
      int result;
      struct layout {
            struct ps3_system_bus_device dev;
            struct ps3_dma_region d_region;
      } *p;

      pr_debug(" -> %s:%d\n", __func__, __LINE__);

      BUG_ON(repo->bus_type != PS3_BUS_TYPE_SB);
      BUG_ON(repo->dev_type != PS3_DEV_TYPE_SB_GELIC);

      p = kzalloc(sizeof(struct layout), GFP_KERNEL);

      if (!p) {
            result = -ENOMEM;
            goto fail_malloc;
      }

      p->dev.match_id = PS3_MATCH_ID_GELIC;
      p->dev.dev_type = PS3_DEVICE_TYPE_SB;
      p->dev.bus_id = repo->bus_id;
      p->dev.dev_id = repo->dev_id;
      p->dev.d_region = &p->d_region;

      result = ps3_repository_find_interrupt(repo,
            PS3_INTERRUPT_TYPE_EVENT_PORT, &p->dev.interrupt_id);

      if (result) {
            pr_debug("%s:%d ps3_repository_find_interrupt failed\n",
                  __func__, __LINE__);
            goto fail_find_interrupt;
      }

      BUG_ON(p->dev.interrupt_id != 0);

      result = ps3_dma_region_init(&p->dev, p->dev.d_region, PS3_DMA_64K,
            PS3_DMA_OTHER, NULL, 0);

      if (result) {
            pr_debug("%s:%d ps3_dma_region_init failed\n",
                  __func__, __LINE__);
            goto fail_dma_init;
      }

      result = ps3_system_bus_device_register(&p->dev);

      if (result) {
            pr_debug("%s:%d ps3_system_bus_device_register failed\n",
                  __func__, __LINE__);
            goto fail_device_register;
      }

      pr_debug(" <- %s:%d\n", __func__, __LINE__);
      return result;

fail_device_register:
fail_dma_init:
fail_find_interrupt:
      kfree(p);
fail_malloc:
      pr_debug(" <- %s:%d: fail.\n", __func__, __LINE__);
      return result;
}

static int __init_refok ps3_setup_uhc_device(
      const struct ps3_repository_device *repo, enum ps3_match_id match_id,
      enum ps3_interrupt_type interrupt_type, enum ps3_reg_type reg_type)
{
      int result;
      struct layout {
            struct ps3_system_bus_device dev;
            struct ps3_dma_region d_region;
            struct ps3_mmio_region m_region;
      } *p;
      u64 bus_addr;
      u64 len;

      pr_debug(" -> %s:%d\n", __func__, __LINE__);

      BUG_ON(repo->bus_type != PS3_BUS_TYPE_SB);
      BUG_ON(repo->dev_type != PS3_DEV_TYPE_SB_USB);

      p = kzalloc(sizeof(struct layout), GFP_KERNEL);

      if (!p) {
            result = -ENOMEM;
            goto fail_malloc;
      }

      p->dev.match_id = match_id;
      p->dev.dev_type = PS3_DEVICE_TYPE_SB;
      p->dev.bus_id = repo->bus_id;
      p->dev.dev_id = repo->dev_id;
      p->dev.d_region = &p->d_region;
      p->dev.m_region = &p->m_region;

      result = ps3_repository_find_interrupt(repo,
            interrupt_type, &p->dev.interrupt_id);

      if (result) {
            pr_debug("%s:%d ps3_repository_find_interrupt failed\n",
                  __func__, __LINE__);
            goto fail_find_interrupt;
      }

      result = ps3_repository_find_reg(repo, reg_type,
            &bus_addr, &len);

      if (result) {
            pr_debug("%s:%d ps3_repository_find_reg failed\n",
                  __func__, __LINE__);
            goto fail_find_reg;
      }

      result = ps3_dma_region_init(&p->dev, p->dev.d_region, PS3_DMA_64K,
            PS3_DMA_INTERNAL, NULL, 0);

      if (result) {
            pr_debug("%s:%d ps3_dma_region_init failed\n",
                  __func__, __LINE__);
            goto fail_dma_init;
      }

      result = ps3_mmio_region_init(&p->dev, p->dev.m_region, bus_addr, len,
            PS3_MMIO_4K);

      if (result) {
            pr_debug("%s:%d ps3_mmio_region_init failed\n",
                  __func__, __LINE__);
            goto fail_mmio_init;
      }

      result = ps3_system_bus_device_register(&p->dev);

      if (result) {
            pr_debug("%s:%d ps3_system_bus_device_register failed\n",
                  __func__, __LINE__);
            goto fail_device_register;
      }

      pr_debug(" <- %s:%d\n", __func__, __LINE__);
      return result;

fail_device_register:
fail_mmio_init:
fail_dma_init:
fail_find_reg:
fail_find_interrupt:
      kfree(p);
fail_malloc:
      pr_debug(" <- %s:%d: fail.\n", __func__, __LINE__);
      return result;
}

static int __init ps3_setup_ehci_device(
      const struct ps3_repository_device *repo)
{
      return ps3_setup_uhc_device(repo, PS3_MATCH_ID_EHCI,
            PS3_INTERRUPT_TYPE_SB_EHCI, PS3_REG_TYPE_SB_EHCI);
}

static int __init ps3_setup_ohci_device(
      const struct ps3_repository_device *repo)
{
      return ps3_setup_uhc_device(repo, PS3_MATCH_ID_OHCI,
            PS3_INTERRUPT_TYPE_SB_OHCI, PS3_REG_TYPE_SB_OHCI);
}

static int __init ps3_setup_vuart_device(enum ps3_match_id match_id,
      unsigned int port_number)
{
      int result;
      struct layout {
            struct ps3_system_bus_device dev;
      } *p;

      pr_debug(" -> %s:%d: match_id %u, port %u\n", __func__, __LINE__,
            match_id, port_number);

      p = kzalloc(sizeof(struct layout), GFP_KERNEL);

      if (!p)
            return -ENOMEM;

      p->dev.match_id = match_id;
      p->dev.dev_type = PS3_DEVICE_TYPE_VUART;
      p->dev.port_number = port_number;

      result = ps3_system_bus_device_register(&p->dev);

      if (result)
            pr_debug("%s:%d ps3_system_bus_device_register failed\n",
                  __func__, __LINE__);

      pr_debug(" <- %s:%d\n", __func__, __LINE__);
      return result;
}

static int ps3_setup_storage_dev(const struct ps3_repository_device *repo,
                         enum ps3_match_id match_id)
{
      int result;
      struct ps3_storage_device *p;
      u64 port, blk_size, num_blocks;
      unsigned int num_regions, i;

      pr_debug(" -> %s:%u: match_id %u\n", __func__, __LINE__, match_id);

      result = ps3_repository_read_stor_dev_info(repo->bus_index,
                                       repo->dev_index, &port,
                                       &blk_size, &num_blocks,
                                       &num_regions);
      if (result) {
            printk(KERN_ERR "%s:%u: _read_stor_dev_info failed %d\n",
                   __func__, __LINE__, result);
            return -ENODEV;
      }

      pr_debug("%s:%u: (%u:%u:%u): port %lu blk_size %lu num_blocks %lu "
             "num_regions %u\n", __func__, __LINE__, repo->bus_index,
             repo->dev_index, repo->dev_type, port, blk_size, num_blocks,
             num_regions);

      p = kzalloc(sizeof(struct ps3_storage_device) +
                num_regions * sizeof(struct ps3_storage_region),
                GFP_KERNEL);
      if (!p) {
            result = -ENOMEM;
            goto fail_malloc;
      }

      p->sbd.match_id = match_id;
      p->sbd.dev_type = PS3_DEVICE_TYPE_SB;
      p->sbd.bus_id = repo->bus_id;
      p->sbd.dev_id = repo->dev_id;
      p->sbd.d_region = &p->dma_region;
      p->blk_size = blk_size;
      p->num_regions = num_regions;

      result = ps3_repository_find_interrupt(repo,
                                     PS3_INTERRUPT_TYPE_EVENT_PORT,
                                     &p->sbd.interrupt_id);
      if (result) {
            printk(KERN_ERR "%s:%u: find_interrupt failed %d\n", __func__,
                   __LINE__, result);
            result = -ENODEV;
            goto fail_find_interrupt;
      }

      for (i = 0; i < num_regions; i++) {
            unsigned int id;
            u64 start, size;

            result = ps3_repository_read_stor_dev_region(repo->bus_index,
                                               repo->dev_index,
                                               i, &id, &start,
                                               &size);
            if (result) {
                  printk(KERN_ERR
                         "%s:%u: read_stor_dev_region failed %d\n",
                         __func__, __LINE__, result);
                  result = -ENODEV;
                  goto fail_read_region;
            }
            pr_debug("%s:%u: region %u: id %u start %lu size %lu\n",
                   __func__, __LINE__, i, id, start, size);

            p->regions[i].id = id;
            p->regions[i].start = start;
            p->regions[i].size = size;
      }

      result = ps3_system_bus_device_register(&p->sbd);
      if (result) {
            pr_debug("%s:%u ps3_system_bus_device_register failed\n",
                   __func__, __LINE__);
            goto fail_device_register;
      }

      pr_debug(" <- %s:%u\n", __func__, __LINE__);
      return 0;

fail_device_register:
fail_read_region:
fail_find_interrupt:
      kfree(p);
fail_malloc:
      pr_debug(" <- %s:%u: fail.\n", __func__, __LINE__);
      return result;
}

static int __init ps3_register_vuart_devices(void)
{
      int result;
      unsigned int port_number;

      pr_debug(" -> %s:%d\n", __func__, __LINE__);

      result = ps3_repository_read_vuart_av_port(&port_number);
      if (result)
            port_number = 0; /* av default */

      result = ps3_setup_vuart_device(PS3_MATCH_ID_AV_SETTINGS, port_number);
      WARN_ON(result);

      result = ps3_repository_read_vuart_sysmgr_port(&port_number);
      if (result)
            port_number = 2; /* sysmgr default */

      result = ps3_setup_vuart_device(PS3_MATCH_ID_SYSTEM_MANAGER,
            port_number);
      WARN_ON(result);

      pr_debug(" <- %s:%d\n", __func__, __LINE__);
      return result;
}

static int __init ps3_register_sound_devices(void)
{
      int result;
      struct layout {
            struct ps3_system_bus_device dev;
            struct ps3_dma_region d_region;
            struct ps3_mmio_region m_region;
      } *p;

      pr_debug(" -> %s:%d\n", __func__, __LINE__);

      p = kzalloc(sizeof(*p), GFP_KERNEL);
      if (!p)
            return -ENOMEM;

      p->dev.match_id = PS3_MATCH_ID_SOUND;
      p->dev.dev_type = PS3_DEVICE_TYPE_IOC0;
      p->dev.d_region = &p->d_region;
      p->dev.m_region = &p->m_region;

      result = ps3_system_bus_device_register(&p->dev);

      if (result)
            pr_debug("%s:%d ps3_system_bus_device_register failed\n",
                  __func__, __LINE__);

      pr_debug(" <- %s:%d\n", __func__, __LINE__);
      return result;
}

static int __init ps3_register_graphics_devices(void)
{
      int result;
      struct layout {
            struct ps3_system_bus_device dev;
      } *p;

      pr_debug(" -> %s:%d\n", __func__, __LINE__);

      p = kzalloc(sizeof(struct layout), GFP_KERNEL);

      if (!p)
            return -ENOMEM;

      p->dev.match_id = PS3_MATCH_ID_GRAPHICS;
      p->dev.match_sub_id = PS3_MATCH_SUB_ID_FB;
      p->dev.dev_type = PS3_DEVICE_TYPE_IOC0;

      result = ps3_system_bus_device_register(&p->dev);

      if (result)
            pr_debug("%s:%d ps3_system_bus_device_register failed\n",
                  __func__, __LINE__);

      pr_debug(" <- %s:%d\n", __func__, __LINE__);
      return result;
}

/**
 * ps3_setup_dynamic_device - Setup a dynamic device from the repository
 */

static int ps3_setup_dynamic_device(const struct ps3_repository_device *repo)
{
      int result;

      switch (repo->dev_type) {
      case PS3_DEV_TYPE_STOR_DISK:
            result = ps3_setup_storage_dev(repo, PS3_MATCH_ID_STOR_DISK);

            /* Some devices are not accessable from the Other OS lpar. */
            if (result == -ENODEV) {
                  result = 0;
                  pr_debug("%s:%u: not accessable\n", __func__,
                         __LINE__);
            }

            if (result)
                  pr_debug("%s:%u ps3_setup_storage_dev failed\n",
                         __func__, __LINE__);
            break;

      case PS3_DEV_TYPE_STOR_ROM:
            result = ps3_setup_storage_dev(repo, PS3_MATCH_ID_STOR_ROM);
            if (result)
                  pr_debug("%s:%u ps3_setup_storage_dev failed\n",
                         __func__, __LINE__);
            break;

      case PS3_DEV_TYPE_STOR_FLASH:
            result = ps3_setup_storage_dev(repo, PS3_MATCH_ID_STOR_FLASH);
            if (result)
                  pr_debug("%s:%u ps3_setup_storage_dev failed\n",
                         __func__, __LINE__);
            break;

      default:
            result = 0;
            pr_debug("%s:%u: unsupported dev_type %u\n", __func__, __LINE__,
                  repo->dev_type);
      }

      return result;
}

/**
 * ps3_setup_static_device - Setup a static device from the repository
 */

static int __init ps3_setup_static_device(const struct ps3_repository_device *repo)
{
      int result;

      switch (repo->dev_type) {
      case PS3_DEV_TYPE_SB_GELIC:
            result = ps3_setup_gelic_device(repo);
            if (result) {
                  pr_debug("%s:%d ps3_setup_gelic_device failed\n",
                        __func__, __LINE__);
            }
            break;
      case PS3_DEV_TYPE_SB_USB:

            /* Each USB device has both an EHCI and an OHCI HC */

            result = ps3_setup_ehci_device(repo);

            if (result) {
                  pr_debug("%s:%d ps3_setup_ehci_device failed\n",
                        __func__, __LINE__);
            }

            result = ps3_setup_ohci_device(repo);

            if (result) {
                  pr_debug("%s:%d ps3_setup_ohci_device failed\n",
                        __func__, __LINE__);
            }
            break;

      default:
            return ps3_setup_dynamic_device(repo);
      }

      return result;
}

static void ps3_find_and_add_device(u64 bus_id, u64 dev_id)
{
      struct ps3_repository_device repo;
      int res;
      unsigned int retries;
      unsigned long rem;

      /*
       * On some firmware versions (e.g. 1.90), the device may not show up
       * in the repository immediately
       */
      for (retries = 0; retries < 10; retries++) {
            res = ps3_repository_find_device_by_id(&repo, bus_id, dev_id);
            if (!res)
                  goto found;

            rem = msleep_interruptible(100);
            if (rem)
                  break;
      }
      pr_warning("%s:%u: device %lu:%lu not found\n", __func__, __LINE__,
               bus_id, dev_id);
      return;

found:
      if (retries)
            pr_debug("%s:%u: device %lu:%lu found after %u retries\n",
                   __func__, __LINE__, bus_id, dev_id, retries);

      ps3_setup_dynamic_device(&repo);
      return;
}

#define PS3_NOTIFICATION_DEV_ID           ULONG_MAX
#define PS3_NOTIFICATION_INTERRUPT_ID     0

00627 struct ps3_notification_device {
      struct ps3_system_bus_device sbd;
      spinlock_t lock;
      u64 tag;
      u64 lv1_status;
      struct completion done;
};

enum ps3_notify_type {
      notify_device_ready = 0,
      notify_region_probe = 1,
      notify_region_update = 2,
};

00641 struct ps3_notify_cmd {
      u64 operation_code;           /* must be zero */
      u64 event_mask;               /* OR of 1UL << enum ps3_notify_type */
};

00646 struct ps3_notify_event {
      u64 event_type;               /* enum ps3_notify_type */
      u64 bus_id;
      u64 dev_id;
      u64 dev_type;
      u64 dev_port;
};

static irqreturn_t ps3_notification_interrupt(int irq, void *data)
{
      struct ps3_notification_device *dev = data;
      int res;
      u64 tag, status;

      spin_lock(&dev->lock);
      res = lv1_storage_get_async_status(PS3_NOTIFICATION_DEV_ID, &tag,
                                 &status);
      if (tag != dev->tag)
            pr_err("%s:%u: tag mismatch, got %lx, expected %lx\n",
                   __func__, __LINE__, tag, dev->tag);

      if (res) {
            pr_err("%s:%u: res %d status 0x%lx\n", __func__, __LINE__, res,
                   status);
      } else {
            pr_debug("%s:%u: completed, status 0x%lx\n", __func__,
                   __LINE__, status);
            dev->lv1_status = status;
            complete(&dev->done);
      }
      spin_unlock(&dev->lock);
      return IRQ_HANDLED;
}

static int ps3_notification_read_write(struct ps3_notification_device *dev,
                               u64 lpar, int write)
{
      const char *op = write ? "write" : "read";
      unsigned long flags;
      int res;

      init_completion(&dev->done);
      spin_lock_irqsave(&dev->lock, flags);
      res = write ? lv1_storage_write(dev->sbd.dev_id, 0, 0, 1, 0, lpar,
                              &dev->tag)
                : lv1_storage_read(dev->sbd.dev_id, 0, 0, 1, 0, lpar,
                               &dev->tag);
      spin_unlock_irqrestore(&dev->lock, flags);
      if (res) {
            pr_err("%s:%u: %s failed %d\n", __func__, __LINE__, op, res);
            return -EPERM;
      }
      pr_debug("%s:%u: notification %s issued\n", __func__, __LINE__, op);

      res = wait_event_interruptible(dev->done.wait,
                               dev->done.done || kthread_should_stop());
      if (kthread_should_stop())
            res = -EINTR;
      if (res) {
            pr_debug("%s:%u: interrupted %s\n", __func__, __LINE__, op);
            return res;
      }

      if (dev->lv1_status) {
            pr_err("%s:%u: %s not completed, status 0x%lx\n", __func__,
                   __LINE__, op, dev->lv1_status);
            return -EIO;
      }
      pr_debug("%s:%u: notification %s completed\n", __func__, __LINE__, op);

      return 0;
}

static struct task_struct *probe_task;

/**
 * ps3_probe_thread - Background repository probing at system startup.
 *
 * This implementation only supports background probing on a single bus.
 * It uses the hypervisor's storage device notification mechanism to wait until
 * a storage device is ready.  The device notification mechanism uses a
 * pseudo device to asynchronously notify the guest when storage devices become
 * ready.  The notification device has a block size of 512 bytes.
 */

static int ps3_probe_thread(void *data)
{
      struct ps3_notification_device dev;
      int res;
      unsigned int irq;
      u64 lpar;
      void *buf;
      struct ps3_notify_cmd *notify_cmd;
      struct ps3_notify_event *notify_event;

      pr_debug(" -> %s:%u: kthread started\n", __func__, __LINE__);

      buf = kzalloc(512, GFP_KERNEL);
      if (!buf)
            return -ENOMEM;

      lpar = ps3_mm_phys_to_lpar(__pa(buf));
      notify_cmd = buf;
      notify_event = buf;

      /* dummy system bus device */
      dev.sbd.bus_id = (u64)data;
      dev.sbd.dev_id = PS3_NOTIFICATION_DEV_ID;
      dev.sbd.interrupt_id = PS3_NOTIFICATION_INTERRUPT_ID;

      res = lv1_open_device(dev.sbd.bus_id, dev.sbd.dev_id, 0);
      if (res) {
            pr_err("%s:%u: lv1_open_device failed %s\n", __func__,
                   __LINE__, ps3_result(res));
            goto fail_free;
      }

      res = ps3_sb_event_receive_port_setup(&dev.sbd, PS3_BINDING_CPU_ANY,
                                    &irq);
      if (res) {
            pr_err("%s:%u: ps3_sb_event_receive_port_setup failed %d\n",
                   __func__, __LINE__, res);
             goto fail_close_device;
      }

      spin_lock_init(&dev.lock);

      res = request_irq(irq, ps3_notification_interrupt, IRQF_DISABLED,
                    "ps3_notification", &dev);
      if (res) {
            pr_err("%s:%u: request_irq failed %d\n", __func__, __LINE__,
                   res);
            goto fail_sb_event_receive_port_destroy;
      }

      /* Setup and write the request for device notification. */
      notify_cmd->operation_code = 0; /* must be zero */
      notify_cmd->event_mask = 1UL << notify_region_probe;

      res = ps3_notification_read_write(&dev, lpar, 1);
      if (res)
            goto fail_free_irq;

      /* Loop here processing the requested notification events. */
      do {
            try_to_freeze();

            memset(notify_event, 0, sizeof(*notify_event));

            res = ps3_notification_read_write(&dev, lpar, 0);
            if (res)
                  break;

            pr_debug("%s:%u: notify event type 0x%lx bus id %lu dev id %lu"
                   " type %lu port %lu\n", __func__, __LINE__,
                   notify_event->event_type, notify_event->bus_id,
                   notify_event->dev_id, notify_event->dev_type,
                   notify_event->dev_port);

            if (notify_event->event_type != notify_region_probe ||
                notify_event->bus_id != dev.sbd.bus_id) {
                  pr_warning("%s:%u: bad notify_event: event %lu, "
                           "dev_id %lu, dev_type %lu\n",
                           __func__, __LINE__, notify_event->event_type,
                           notify_event->dev_id,
                           notify_event->dev_type);
                  continue;
            }

            ps3_find_and_add_device(dev.sbd.bus_id, notify_event->dev_id);

      } while (!kthread_should_stop());

fail_free_irq:
      free_irq(irq, &dev);
fail_sb_event_receive_port_destroy:
      ps3_sb_event_receive_port_destroy(&dev.sbd, irq);
fail_close_device:
      lv1_close_device(dev.sbd.bus_id, dev.sbd.dev_id);
fail_free:
      kfree(buf);

      probe_task = NULL;

      pr_debug(" <- %s:%u: kthread finished\n", __func__, __LINE__);

      return 0;
}

/**
 * ps3_stop_probe_thread - Stops the background probe thread.
 *
 */

static int ps3_stop_probe_thread(struct notifier_block *nb, unsigned long code,
                         void *data)
{
      if (probe_task)
            kthread_stop(probe_task);
      return 0;
}

static struct notifier_block nb = {
      .notifier_call = ps3_stop_probe_thread
};

/**
 * ps3_start_probe_thread - Starts the background probe thread.
 *
 */

static int __init ps3_start_probe_thread(enum ps3_bus_type bus_type)
{
      int result;
      struct task_struct *task;
      struct ps3_repository_device repo;

      pr_debug(" -> %s:%d\n", __func__, __LINE__);

      memset(&repo, 0, sizeof(repo));

      repo.bus_type = bus_type;

      result = ps3_repository_find_bus(repo.bus_type, 0, &repo.bus_index);

      if (result) {
            printk(KERN_ERR "%s: Cannot find bus (%d)\n", __func__, result);
            return -ENODEV;
      }

      result = ps3_repository_read_bus_id(repo.bus_index, &repo.bus_id);

      if (result) {
            printk(KERN_ERR "%s: read_bus_id failed %d\n", __func__,
                  result);
            return -ENODEV;
      }

      task = kthread_run(ps3_probe_thread, (void *)repo.bus_id,
                     "ps3-probe-%u", bus_type);

      if (IS_ERR(task)) {
            result = PTR_ERR(task);
            printk(KERN_ERR "%s: kthread_run failed %d\n", __func__,
                   result);
            return result;
      }

      probe_task = task;
      register_reboot_notifier(&nb);

      pr_debug(" <- %s:%d\n", __func__, __LINE__);
      return 0;
}

/**
 * ps3_register_devices - Probe the system and register devices found.
 *
 * A device_initcall() routine.
 */

static int __init ps3_register_devices(void)
{
      int result;

      if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
            return -ENODEV;

      pr_debug(" -> %s:%d\n", __func__, __LINE__);

      /* ps3_repository_dump_bus_info(); */

      result = ps3_start_probe_thread(PS3_BUS_TYPE_STORAGE);

      ps3_register_vuart_devices();

      ps3_register_graphics_devices();

      ps3_repository_find_devices(PS3_BUS_TYPE_SB, ps3_setup_static_device);

      ps3_register_sound_devices();

      ps3_register_lpm_devices();

      pr_debug(" <- %s:%d\n", __func__, __LINE__);
      return 0;
}

device_initcall(ps3_register_devices);

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