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pci_link.c

/*
 *  pci_link.c - ACPI PCI Interrupt Link Device Driver ($Revision: 34 $)
 *
 *  Copyright (C) 2001, 2002 Andy Grover <andrew.grover@intel.com>
 *  Copyright (C) 2001, 2002 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
 *  Copyright (C) 2002       Dominik Brodowski <devel@brodo.de>
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 *  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; either version 2 of the License, or (at
 *  your option) any later version.
 *
 *  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.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * TBD: 
 *      1. Support more than one IRQ resource entry per link device (index).
 *    2. Implement start/stop mechanism and use ACPI Bus Driver facilities
 *       for IRQ management (e.g. start()->_SRS).
 */

#include <linux/sysdev.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/proc_fs.h>
#include <linux/spinlock.h>
#include <linux/pm.h>
#include <linux/pci.h>
#include <linux/mutex.h>

#include <acpi/acpi_bus.h>
#include <acpi/acpi_drivers.h>

#define _COMPONENT            ACPI_PCI_COMPONENT
ACPI_MODULE_NAME("pci_link");
#define ACPI_PCI_LINK_CLASS         "pci_irq_routing"
#define ACPI_PCI_LINK_DEVICE_NAME   "PCI Interrupt Link"
#define ACPI_PCI_LINK_FILE_INFO           "info"
#define ACPI_PCI_LINK_FILE_STATUS   "state"
#define ACPI_PCI_LINK_MAX_POSSIBLE 16
static int acpi_pci_link_add(struct acpi_device *device);
static int acpi_pci_link_remove(struct acpi_device *device, int type);

static struct acpi_device_id link_device_ids[] = {
      {"PNP0C0F", 0},
      {"", 0},
};
MODULE_DEVICE_TABLE(acpi, link_device_ids);

static struct acpi_driver acpi_pci_link_driver = {
      .name = "pci_link",
      .class = ACPI_PCI_LINK_CLASS,
      .ids = link_device_ids,
      .ops = {
            .add = acpi_pci_link_add,
            .remove = acpi_pci_link_remove,
            },
};

/*
 * If a link is initialized, we never change its active and initialized
 * later even the link is disable. Instead, we just repick the active irq
 */
struct acpi_pci_link_irq {
      u8 active;        /* Current IRQ */
      u8 triggering;          /* All IRQs */
      u8 polarity;      /* All IRQs */
      u8 resource_type;
      u8 possible_count;
      u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
      u8 initialized:1;
      u8 reserved:7;
};

struct acpi_pci_link {
      struct list_head node;
      struct acpi_device *device;
      struct acpi_pci_link_irq irq;
      int refcnt;
};

static struct {
      int count;
      struct list_head entries;
} acpi_link;
DEFINE_MUTEX(acpi_link_lock);

/* --------------------------------------------------------------------------
                            PCI Link Device Management
   -------------------------------------------------------------------------- */

/*
 * set context (link) possible list from resource list
 */
static acpi_status
acpi_pci_link_check_possible(struct acpi_resource *resource, void *context)
{
      struct acpi_pci_link *link = context;
      u32 i = 0;


      switch (resource->type) {
      case ACPI_RESOURCE_TYPE_START_DEPENDENT:
            return AE_OK;
      case ACPI_RESOURCE_TYPE_IRQ:
            {
                  struct acpi_resource_irq *p = &resource->data.irq;
                  if (!p || !p->interrupt_count) {
                        printk(KERN_WARNING PREFIX "Blank IRQ resource\n");
                        return AE_OK;
                  }
                  for (i = 0;
                       (i < p->interrupt_count
                        && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
                        if (!p->interrupts[i]) {
                              printk(KERN_WARNING PREFIX "Invalid IRQ %d\n",
                                          p->interrupts[i]);
                              continue;
                        }
                        link->irq.possible[i] = p->interrupts[i];
                        link->irq.possible_count++;
                  }
                  link->irq.triggering = p->triggering;
                  link->irq.polarity = p->polarity;
                  link->irq.resource_type = ACPI_RESOURCE_TYPE_IRQ;
                  break;
            }
      case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
            {
                  struct acpi_resource_extended_irq *p =
                      &resource->data.extended_irq;
                  if (!p || !p->interrupt_count) {
                        printk(KERN_WARNING PREFIX
                                    "Blank EXT IRQ resource\n");
                        return AE_OK;
                  }
                  for (i = 0;
                       (i < p->interrupt_count
                        && i < ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
                        if (!p->interrupts[i]) {
                              printk(KERN_WARNING PREFIX "Invalid IRQ %d\n",
                                          p->interrupts[i]);
                              continue;
                        }
                        link->irq.possible[i] = p->interrupts[i];
                        link->irq.possible_count++;
                  }
                  link->irq.triggering = p->triggering;
                  link->irq.polarity = p->polarity;
                  link->irq.resource_type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
                  break;
            }
      default:
            printk(KERN_ERR PREFIX "Resource is not an IRQ entry\n");
            return AE_OK;
      }

      return AE_CTRL_TERMINATE;
}

static int acpi_pci_link_get_possible(struct acpi_pci_link *link)
{
      acpi_status status;


      if (!link)
            return -EINVAL;

      status = acpi_walk_resources(link->device->handle, METHOD_NAME__PRS,
                             acpi_pci_link_check_possible, link);
      if (ACPI_FAILURE(status)) {
            ACPI_EXCEPTION((AE_INFO, status, "Evaluating _PRS"));
            return -ENODEV;
      }

      ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                    "Found %d possible IRQs\n",
                    link->irq.possible_count));

      return 0;
}

static acpi_status
acpi_pci_link_check_current(struct acpi_resource *resource, void *context)
{
      int *irq = (int *)context;


      switch (resource->type) {
      case ACPI_RESOURCE_TYPE_IRQ:
            {
                  struct acpi_resource_irq *p = &resource->data.irq;
                  if (!p || !p->interrupt_count) {
                        /*
                         * IRQ descriptors may have no IRQ# bits set,
                         * particularly those those w/ _STA disabled
                         */
                        ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                                      "Blank IRQ resource\n"));
                        return AE_OK;
                  }
                  *irq = p->interrupts[0];
                  break;
            }
      case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
            {
                  struct acpi_resource_extended_irq *p =
                      &resource->data.extended_irq;
                  if (!p || !p->interrupt_count) {
                        /*
                         * extended IRQ descriptors must
                         * return at least 1 IRQ
                         */
                        printk(KERN_WARNING PREFIX
                                    "Blank EXT IRQ resource\n");
                        return AE_OK;
                  }
                  *irq = p->interrupts[0];
                  break;
            }
            break;
      default:
            printk(KERN_ERR PREFIX "Resource %d isn't an IRQ\n", resource->type);
      case ACPI_RESOURCE_TYPE_END_TAG:
            return AE_OK;
      }
      return AE_CTRL_TERMINATE;
}

/*
 * Run _CRS and set link->irq.active
 *
 * return value:
 * 0 - success
 * !0 - failure
 */
static int acpi_pci_link_get_current(struct acpi_pci_link *link)
{
      int result = 0;
      acpi_status status = AE_OK;
      int irq = 0;

      if (!link)
            return -EINVAL;

      link->irq.active = 0;

      /* in practice, status disabled is meaningless, ignore it */
      if (acpi_strict) {
            /* Query _STA, set link->device->status */
            result = acpi_bus_get_status(link->device);
            if (result) {
                  printk(KERN_ERR PREFIX "Unable to read status\n");
                  goto end;
            }

            if (!link->device->status.enabled) {
                  ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n"));
                  return 0;
            }
      }

      /* 
       * Query and parse _CRS to get the current IRQ assignment. 
       */

      status = acpi_walk_resources(link->device->handle, METHOD_NAME__CRS,
                             acpi_pci_link_check_current, &irq);
      if (ACPI_FAILURE(status)) {
            ACPI_EXCEPTION((AE_INFO, status, "Evaluating _CRS"));
            result = -ENODEV;
            goto end;
      }

      if (acpi_strict && !irq) {
            printk(KERN_ERR PREFIX "_CRS returned 0\n");
            result = -ENODEV;
      }

      link->irq.active = irq;

      ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link at IRQ %d \n", link->irq.active));

      end:
      return result;
}

static int acpi_pci_link_set(struct acpi_pci_link *link, int irq)
{
      int result = 0;
      acpi_status status = AE_OK;
      struct {
            struct acpi_resource res;
            struct acpi_resource end;
      } *resource;
      struct acpi_buffer buffer = { 0, NULL };


      if (!link || !irq)
            return -EINVAL;

      resource = kzalloc(sizeof(*resource) + 1, irqs_disabled() ? GFP_ATOMIC: GFP_KERNEL);
      if (!resource)
            return -ENOMEM;

      buffer.length = sizeof(*resource) + 1;
      buffer.pointer = resource;

      switch (link->irq.resource_type) {
      case ACPI_RESOURCE_TYPE_IRQ:
            resource->res.type = ACPI_RESOURCE_TYPE_IRQ;
            resource->res.length = sizeof(struct acpi_resource);
            resource->res.data.irq.triggering = link->irq.triggering;
            resource->res.data.irq.polarity =
                link->irq.polarity;
            if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
                  resource->res.data.irq.sharable =
                      ACPI_EXCLUSIVE;
            else
                  resource->res.data.irq.sharable = ACPI_SHARED;
            resource->res.data.irq.interrupt_count = 1;
            resource->res.data.irq.interrupts[0] = irq;
            break;

      case ACPI_RESOURCE_TYPE_EXTENDED_IRQ:
            resource->res.type = ACPI_RESOURCE_TYPE_EXTENDED_IRQ;
            resource->res.length = sizeof(struct acpi_resource);
            resource->res.data.extended_irq.producer_consumer =
                ACPI_CONSUMER;
            resource->res.data.extended_irq.triggering =
                link->irq.triggering;
            resource->res.data.extended_irq.polarity =
                link->irq.polarity;
            if (link->irq.triggering == ACPI_EDGE_SENSITIVE)
                  resource->res.data.irq.sharable =
                      ACPI_EXCLUSIVE;
            else
                  resource->res.data.irq.sharable = ACPI_SHARED;
            resource->res.data.extended_irq.interrupt_count = 1;
            resource->res.data.extended_irq.interrupts[0] = irq;
            /* ignore resource_source, it's optional */
            break;
      default:
            printk(KERN_ERR PREFIX "Invalid Resource_type %d\n", link->irq.resource_type);
            result = -EINVAL;
            goto end;

      }
      resource->end.type = ACPI_RESOURCE_TYPE_END_TAG;

      /* Attempt to set the resource */
      status = acpi_set_current_resources(link->device->handle, &buffer);

      /* check for total failure */
      if (ACPI_FAILURE(status)) {
            ACPI_EXCEPTION((AE_INFO, status, "Evaluating _SRS"));
            result = -ENODEV;
            goto end;
      }

      /* Query _STA, set device->status */
      result = acpi_bus_get_status(link->device);
      if (result) {
            printk(KERN_ERR PREFIX "Unable to read status\n");
            goto end;
      }
      if (!link->device->status.enabled) {
            printk(KERN_WARNING PREFIX
                        "%s [%s] disabled and referenced, BIOS bug\n",
                        acpi_device_name(link->device),
                        acpi_device_bid(link->device));
      }

      /* Query _CRS, set link->irq.active */
      result = acpi_pci_link_get_current(link);
      if (result) {
            goto end;
      }

      /*
       * Is current setting not what we set?
       * set link->irq.active
       */
      if (link->irq.active != irq) {
            /*
             * policy: when _CRS doesn't return what we just _SRS
             * assume _SRS worked and override _CRS value.
             */
            printk(KERN_WARNING PREFIX
                        "%s [%s] BIOS reported IRQ %d, using IRQ %d\n",
                        acpi_device_name(link->device),
                        acpi_device_bid(link->device), link->irq.active, irq);
            link->irq.active = irq;
      }

      ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active));

      end:
      kfree(resource);
      return result;
}

/* --------------------------------------------------------------------------
                            PCI Link IRQ Management
   -------------------------------------------------------------------------- */

/*
 * "acpi_irq_balance" (default in APIC mode) enables ACPI to use PIC Interrupt
 * Link Devices to move the PIRQs around to minimize sharing.
 * 
 * "acpi_irq_nobalance" (default in PIC mode) tells ACPI not to move any PIC IRQs
 * that the BIOS has already set to active.  This is necessary because
 * ACPI has no automatic means of knowing what ISA IRQs are used.  Note that
 * if the BIOS doesn't set a Link Device active, ACPI needs to program it
 * even if acpi_irq_nobalance is set.
 *
 * A tables of penalties avoids directing PCI interrupts to well known
 * ISA IRQs. Boot params are available to over-ride the default table:
 *
 * List interrupts that are free for PCI use.
 * acpi_irq_pci=n[,m]
 *
 * List interrupts that should not be used for PCI:
 * acpi_irq_isa=n[,m]
 *
 * Note that PCI IRQ routers have a list of possible IRQs,
 * which may not include the IRQs this table says are available.
 * 
 * Since this heuristic can't tell the difference between a link
 * that no device will attach to, vs. a link which may be shared
 * by multiple active devices -- it is not optimal.
 *
 * If interrupt performance is that important, get an IO-APIC system
 * with a pin dedicated to each device.  Or for that matter, an MSI
 * enabled system.
 */

#define ACPI_MAX_IRQS         256
#define ACPI_MAX_ISA_IRQ      16

#define PIRQ_PENALTY_PCI_AVAILABLE  (0)
#define PIRQ_PENALTY_PCI_POSSIBLE   (16*16)
#define PIRQ_PENALTY_PCI_USING            (16*16*16)
#define PIRQ_PENALTY_ISA_TYPICAL    (16*16*16*16)
#define PIRQ_PENALTY_ISA_USED       (16*16*16*16*16)
#define PIRQ_PENALTY_ISA_ALWAYS           (16*16*16*16*16*16)

static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
      PIRQ_PENALTY_ISA_ALWAYS,      /* IRQ0 timer */
      PIRQ_PENALTY_ISA_ALWAYS,      /* IRQ1 keyboard */
      PIRQ_PENALTY_ISA_ALWAYS,      /* IRQ2 cascade */
      PIRQ_PENALTY_ISA_TYPICAL,     /* IRQ3 serial */
      PIRQ_PENALTY_ISA_TYPICAL,     /* IRQ4 serial */
      PIRQ_PENALTY_ISA_TYPICAL,     /* IRQ5 sometimes SoundBlaster */
      PIRQ_PENALTY_ISA_TYPICAL,     /* IRQ6 */
      PIRQ_PENALTY_ISA_TYPICAL,     /* IRQ7 parallel, spurious */
      PIRQ_PENALTY_ISA_TYPICAL,     /* IRQ8 rtc, sometimes */
      PIRQ_PENALTY_PCI_AVAILABLE,   /* IRQ9  PCI, often acpi */
      PIRQ_PENALTY_PCI_AVAILABLE,   /* IRQ10 PCI */
      PIRQ_PENALTY_PCI_AVAILABLE,   /* IRQ11 PCI */
      PIRQ_PENALTY_ISA_USED,  /* IRQ12 mouse */
      PIRQ_PENALTY_ISA_USED,  /* IRQ13 fpe, sometimes */
      PIRQ_PENALTY_ISA_USED,  /* IRQ14 ide0 */
      PIRQ_PENALTY_ISA_USED,  /* IRQ15 ide1 */
      /* >IRQ15 */
};

int __init acpi_irq_penalty_init(void)
{
      struct list_head *node = NULL;
      struct acpi_pci_link *link = NULL;
      int i = 0;


      /*
       * Update penalties to facilitate IRQ balancing.
       */
      list_for_each(node, &acpi_link.entries) {

            link = list_entry(node, struct acpi_pci_link, node);
            if (!link) {
                  printk(KERN_ERR PREFIX "Invalid link context\n");
                  continue;
            }

            /*
             * reflect the possible and active irqs in the penalty table --
             * useful for breaking ties.
             */
            if (link->irq.possible_count) {
                  int penalty =
                      PIRQ_PENALTY_PCI_POSSIBLE /
                      link->irq.possible_count;

                  for (i = 0; i < link->irq.possible_count; i++) {
                        if (link->irq.possible[i] < ACPI_MAX_ISA_IRQ)
                              acpi_irq_penalty[link->irq.
                                           possible[i]] +=
                                  penalty;
                  }

            } else if (link->irq.active) {
                  acpi_irq_penalty[link->irq.active] +=
                      PIRQ_PENALTY_PCI_POSSIBLE;
            }
      }
      /* Add a penalty for the SCI */
      acpi_irq_penalty[acpi_gbl_FADT.sci_interrupt] += PIRQ_PENALTY_PCI_USING;

      return 0;
}

static int acpi_irq_balance;  /* 0: static, 1: balance */

static int acpi_pci_link_allocate(struct acpi_pci_link *link)
{
      int irq;
      int i;


      if (link->irq.initialized) {
            if (link->refcnt == 0)
                  /* This means the link is disabled but initialized */
                  acpi_pci_link_set(link, link->irq.active);
            return 0;
      }

      /*
       * search for active IRQ in list of possible IRQs.
       */
      for (i = 0; i < link->irq.possible_count; ++i) {
            if (link->irq.active == link->irq.possible[i])
                  break;
      }
      /*
       * forget active IRQ that is not in possible list
       */
      if (i == link->irq.possible_count) {
            if (acpi_strict)
                  printk(KERN_WARNING PREFIX "_CRS %d not found"
                              " in _PRS\n", link->irq.active);
            link->irq.active = 0;
      }

      /*
       * if active found, use it; else pick entry from end of possible list.
       */
      if (link->irq.active) {
            irq = link->irq.active;
      } else {
            irq = link->irq.possible[link->irq.possible_count - 1];
      }

      if (acpi_irq_balance || !link->irq.active) {
            /*
             * Select the best IRQ.  This is done in reverse to promote
             * the use of IRQs 9, 10, 11, and >15.
             */
            for (i = (link->irq.possible_count - 1); i >= 0; i--) {
                  if (acpi_irq_penalty[irq] >
                      acpi_irq_penalty[link->irq.possible[i]])
                        irq = link->irq.possible[i];
            }
      }

      /* Attempt to enable the link device at this IRQ. */
      if (acpi_pci_link_set(link, irq)) {
            printk(KERN_ERR PREFIX "Unable to set IRQ for %s [%s]. "
                      "Try pci=noacpi or acpi=off\n",
                      acpi_device_name(link->device),
                      acpi_device_bid(link->device));
            return -ENODEV;
      } else {
            acpi_irq_penalty[link->irq.active] += PIRQ_PENALTY_PCI_USING;
            printk(PREFIX "%s [%s] enabled at IRQ %d\n",
                   acpi_device_name(link->device),
                   acpi_device_bid(link->device), link->irq.active);
      }

      link->irq.initialized = 1;

      return 0;
}

/*
 * acpi_pci_link_allocate_irq
 * success: return IRQ >= 0
 * failure: return -1
 */

int
acpi_pci_link_allocate_irq(acpi_handle handle,
                     int index,
                     int *triggering, int *polarity, char **name)
{
      int result = 0;
      struct acpi_device *device = NULL;
      struct acpi_pci_link *link = NULL;


      result = acpi_bus_get_device(handle, &device);
      if (result) {
            printk(KERN_ERR PREFIX "Invalid link device\n");
            return -1;
      }

      link = acpi_driver_data(device);
      if (!link) {
            printk(KERN_ERR PREFIX "Invalid link context\n");
            return -1;
      }

      /* TBD: Support multiple index (IRQ) entries per Link Device */
      if (index) {
            printk(KERN_ERR PREFIX "Invalid index %d\n", index);
            return -1;
      }

      mutex_lock(&acpi_link_lock);
      if (acpi_pci_link_allocate(link)) {
            mutex_unlock(&acpi_link_lock);
            return -1;
      }

      if (!link->irq.active) {
            mutex_unlock(&acpi_link_lock);
            printk(KERN_ERR PREFIX "Link active IRQ is 0!\n");
            return -1;
      }
      link->refcnt++;
      mutex_unlock(&acpi_link_lock);

      if (triggering)
            *triggering = link->irq.triggering;
      if (polarity)
            *polarity = link->irq.polarity;
      if (name)
            *name = acpi_device_bid(link->device);
      ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                    "Link %s is referenced\n",
                    acpi_device_bid(link->device)));
      return (link->irq.active);
}

/*
 * We don't change link's irq information here.  After it is reenabled, we
 * continue use the info
 */
int acpi_pci_link_free_irq(acpi_handle handle)
{
      struct acpi_device *device = NULL;
      struct acpi_pci_link *link = NULL;
      acpi_status result;


      result = acpi_bus_get_device(handle, &device);
      if (result) {
            printk(KERN_ERR PREFIX "Invalid link device\n");
            return -1;
      }

      link = acpi_driver_data(device);
      if (!link) {
            printk(KERN_ERR PREFIX "Invalid link context\n");
            return -1;
      }

      mutex_lock(&acpi_link_lock);
      if (!link->irq.initialized) {
            mutex_unlock(&acpi_link_lock);
            printk(KERN_ERR PREFIX "Link isn't initialized\n");
            return -1;
      }
#ifdef      FUTURE_USE
      /*
       * The Link reference count allows us to _DISable an unused link
       * and suspend time, and set it again  on resume.
       * However, 2.6.12 still has irq_router.resume
       * which blindly restores the link state.
       * So we disable the reference count method
       * to prevent duplicate acpi_pci_link_set()
       * which would harm some systems
       */
      link->refcnt--;
#endif
      ACPI_DEBUG_PRINT((ACPI_DB_INFO,
                    "Link %s is dereferenced\n",
                    acpi_device_bid(link->device)));

      if (link->refcnt == 0) {
            acpi_ut_evaluate_object(link->device->handle, "_DIS", 0, NULL);
      }
      mutex_unlock(&acpi_link_lock);
      return (link->irq.active);
}

/* --------------------------------------------------------------------------
                                 Driver Interface
   -------------------------------------------------------------------------- */

static int acpi_pci_link_add(struct acpi_device *device)
{
      int result = 0;
      struct acpi_pci_link *link = NULL;
      int i = 0;
      int found = 0;


      if (!device)
            return -EINVAL;

      link = kzalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);
      if (!link)
            return -ENOMEM;

      link->device = device;
      strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME);
      strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS);
      acpi_driver_data(device) = link;

      mutex_lock(&acpi_link_lock);
      result = acpi_pci_link_get_possible(link);
      if (result)
            goto end;

      /* query and set link->irq.active */
      acpi_pci_link_get_current(link);

      printk(KERN_INFO PREFIX "%s [%s] (IRQs", acpi_device_name(device),
             acpi_device_bid(device));
      for (i = 0; i < link->irq.possible_count; i++) {
            if (link->irq.active == link->irq.possible[i]) {
                  printk(" *%d", link->irq.possible[i]);
                  found = 1;
            } else
                  printk(" %d", link->irq.possible[i]);
      }

      printk(")");

      if (!found)
            printk(" *%d", link->irq.active);

      if (!link->device->status.enabled)
            printk(", disabled.");

      printk("\n");

      /* TBD: Acquire/release lock */
      list_add_tail(&link->node, &acpi_link.entries);
      acpi_link.count++;

      end:
      /* disable all links -- to be activated on use */
      acpi_ut_evaluate_object(device->handle, "_DIS", 0, NULL);
      mutex_unlock(&acpi_link_lock);

      if (result)
            kfree(link);

      return result;
}

static int acpi_pci_link_resume(struct acpi_pci_link *link)
{

      if (link->refcnt && link->irq.active && link->irq.initialized)
            return (acpi_pci_link_set(link, link->irq.active));
      else
            return 0;
}

static int irqrouter_resume(struct sys_device *dev)
{
      struct list_head *node = NULL;
      struct acpi_pci_link *link = NULL;


      /* Make sure SCI is enabled again (Apple firmware bug?) */
      acpi_set_register(ACPI_BITREG_SCI_ENABLE, 1);

      list_for_each(node, &acpi_link.entries) {
            link = list_entry(node, struct acpi_pci_link, node);
            if (!link) {
                  printk(KERN_ERR PREFIX "Invalid link context\n");
                  continue;
            }
            acpi_pci_link_resume(link);
      }
      return 0;
}

static int acpi_pci_link_remove(struct acpi_device *device, int type)
{
      struct acpi_pci_link *link = NULL;


      if (!device || !acpi_driver_data(device))
            return -EINVAL;

      link = acpi_driver_data(device);

      mutex_lock(&acpi_link_lock);
      list_del(&link->node);
      mutex_unlock(&acpi_link_lock);

      kfree(link);

      return 0;
}

/*
 * modify acpi_irq_penalty[] from cmdline
 */
static int __init acpi_irq_penalty_update(char *str, int used)
{
      int i;

      for (i = 0; i < 16; i++) {
            int retval;
            int irq;

            retval = get_option(&str, &irq);

            if (!retval)
                  break;      /* no number found */

            if (irq < 0)
                  continue;

            if (irq >= ACPI_MAX_IRQS)
                  continue;

            if (used)
                  acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
            else
                  acpi_irq_penalty[irq] = PIRQ_PENALTY_PCI_AVAILABLE;

            if (retval != 2)  /* no next number */
                  break;
      }
      return 1;
}

/*
 * We'd like PNP to call this routine for the
 * single ISA_USED value for each legacy device.
 * But instead it calls us with each POSSIBLE setting.
 * There is no ISA_POSSIBLE weight, so we simply use
 * the (small) PCI_USING penalty.
 */
void acpi_penalize_isa_irq(int irq, int active)
{
      if (active)
            acpi_irq_penalty[irq] += PIRQ_PENALTY_ISA_USED;
      else
            acpi_irq_penalty[irq] += PIRQ_PENALTY_PCI_USING;
}

/*
 * Over-ride default table to reserve additional IRQs for use by ISA
 * e.g. acpi_irq_isa=5
 * Useful for telling ACPI how not to interfere with your ISA sound card.
 */
static int __init acpi_irq_isa(char *str)
{
      return acpi_irq_penalty_update(str, 1);
}

__setup("acpi_irq_isa=", acpi_irq_isa);

/*
 * Over-ride default table to free additional IRQs for use by PCI
 * e.g. acpi_irq_pci=7,15
 * Used for acpi_irq_balance to free up IRQs to reduce PCI IRQ sharing.
 */
static int __init acpi_irq_pci(char *str)
{
      return acpi_irq_penalty_update(str, 0);
}

__setup("acpi_irq_pci=", acpi_irq_pci);

static int __init acpi_irq_nobalance_set(char *str)
{
      acpi_irq_balance = 0;
      return 1;
}

__setup("acpi_irq_nobalance", acpi_irq_nobalance_set);

int __init acpi_irq_balance_set(char *str)
{
      acpi_irq_balance = 1;
      return 1;
}

__setup("acpi_irq_balance", acpi_irq_balance_set);

/* FIXME: we will remove this interface after all drivers call pci_disable_device */
static struct sysdev_class irqrouter_sysdev_class = {
      set_kset_name("irqrouter"),
      .resume = irqrouter_resume,
};

static struct sys_device device_irqrouter = {
      .id = 0,
      .cls = &irqrouter_sysdev_class,
};

static int __init irqrouter_init_sysfs(void)
{
      int error;


      if (acpi_disabled || acpi_noirq)
            return 0;

      error = sysdev_class_register(&irqrouter_sysdev_class);
      if (!error)
            error = sysdev_register(&device_irqrouter);

      return error;
}

device_initcall(irqrouter_init_sysfs);

static int __init acpi_pci_link_init(void)
{

      if (acpi_noirq)
            return 0;

      acpi_link.count = 0;
      INIT_LIST_HEAD(&acpi_link.entries);

      if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0)
            return -ENODEV;

      return 0;
}

subsys_initcall(acpi_pci_link_init);

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