Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
diff --git a/drivers/acpi/pci_link.c b/drivers/acpi/pci_link.c
new file mode 100644
index 0000000..520b28a
--- /dev/null
+++ b/drivers/acpi/pci_link.c
@@ -0,0 +1,904 @@
+/*
+ * 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 <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_HID "PNP0C0F"
+#define ACPI_PCI_LINK_DRIVER_NAME "ACPI PCI Interrupt Link Driver"
+#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_driver acpi_pci_link_driver = {
+ .name = ACPI_PCI_LINK_DRIVER_NAME,
+ .class = ACPI_PCI_LINK_CLASS,
+ .ids = ACPI_PCI_LINK_HID,
+ .ops = {
+ .add = acpi_pci_link_add,
+ .remove = acpi_pci_link_remove,
+ },
+};
+
+struct acpi_pci_link_irq {
+ u8 active; /* Current IRQ */
+ u8 edge_level; /* All IRQs */
+ u8 active_high_low; /* All IRQs */
+ u8 initialized;
+ u8 resource_type;
+ u8 possible_count;
+ u8 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
+};
+
+struct acpi_pci_link {
+ struct list_head node;
+ struct acpi_device *device;
+ acpi_handle handle;
+ struct acpi_pci_link_irq irq;
+};
+
+static struct {
+ int count;
+ struct list_head entries;
+} acpi_link;
+
+
+/* --------------------------------------------------------------------------
+ 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 = (struct acpi_pci_link *) context;
+ u32 i = 0;
+
+ ACPI_FUNCTION_TRACE("acpi_pci_link_check_possible");
+
+ switch (resource->id) {
+ case ACPI_RSTYPE_START_DPF:
+ return_ACPI_STATUS(AE_OK);
+ case ACPI_RSTYPE_IRQ:
+ {
+ struct acpi_resource_irq *p = &resource->data.irq;
+ if (!p || !p->number_of_interrupts) {
+ ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Blank IRQ resource\n"));
+ return_ACPI_STATUS(AE_OK);
+ }
+ for (i = 0; (i<p->number_of_interrupts && i<ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
+ if (!p->interrupts[i]) {
+ ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid IRQ %d\n", p->interrupts[i]));
+ continue;
+ }
+ link->irq.possible[i] = p->interrupts[i];
+ link->irq.possible_count++;
+ }
+ link->irq.edge_level = p->edge_level;
+ link->irq.active_high_low = p->active_high_low;
+ link->irq.resource_type = ACPI_RSTYPE_IRQ;
+ break;
+ }
+ case ACPI_RSTYPE_EXT_IRQ:
+ {
+ struct acpi_resource_ext_irq *p = &resource->data.extended_irq;
+ if (!p || !p->number_of_interrupts) {
+ ACPI_DEBUG_PRINT((ACPI_DB_WARN,
+ "Blank EXT IRQ resource\n"));
+ return_ACPI_STATUS(AE_OK);
+ }
+ for (i = 0; (i<p->number_of_interrupts && i<ACPI_PCI_LINK_MAX_POSSIBLE); i++) {
+ if (!p->interrupts[i]) {
+ ACPI_DEBUG_PRINT((ACPI_DB_WARN, "Invalid IRQ %d\n", p->interrupts[i]));
+ continue;
+ }
+ link->irq.possible[i] = p->interrupts[i];
+ link->irq.possible_count++;
+ }
+ link->irq.edge_level = p->edge_level;
+ link->irq.active_high_low = p->active_high_low;
+ link->irq.resource_type = ACPI_RSTYPE_EXT_IRQ;
+ break;
+ }
+ default:
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+ "Resource is not an IRQ entry\n"));
+ return_ACPI_STATUS(AE_OK);
+ }
+
+ return_ACPI_STATUS(AE_CTRL_TERMINATE);
+}
+
+
+static int
+acpi_pci_link_get_possible (
+ struct acpi_pci_link *link)
+{
+ acpi_status status;
+
+ ACPI_FUNCTION_TRACE("acpi_pci_link_get_possible");
+
+ if (!link)
+ return_VALUE(-EINVAL);
+
+ status = acpi_walk_resources(link->handle, METHOD_NAME__PRS,
+ acpi_pci_link_check_possible, link);
+ if (ACPI_FAILURE(status)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _PRS\n"));
+ return_VALUE(-ENODEV);
+ }
+
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO,
+ "Found %d possible IRQs\n", link->irq.possible_count));
+
+ return_VALUE(0);
+}
+
+
+static acpi_status
+acpi_pci_link_check_current (
+ struct acpi_resource *resource,
+ void *context)
+{
+ int *irq = (int *) context;
+
+ ACPI_FUNCTION_TRACE("acpi_pci_link_check_current");
+
+ switch (resource->id) {
+ case ACPI_RSTYPE_IRQ:
+ {
+ struct acpi_resource_irq *p = &resource->data.irq;
+ if (!p || !p->number_of_interrupts) {
+ /*
+ * 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_ACPI_STATUS(AE_OK);
+ }
+ *irq = p->interrupts[0];
+ break;
+ }
+ case ACPI_RSTYPE_EXT_IRQ:
+ {
+ struct acpi_resource_ext_irq *p = &resource->data.extended_irq;
+ if (!p || !p->number_of_interrupts) {
+ /*
+ * extended IRQ descriptors must
+ * return at least 1 IRQ
+ */
+ ACPI_DEBUG_PRINT((ACPI_DB_WARN,
+ "Blank EXT IRQ resource\n"));
+ return_ACPI_STATUS(AE_OK);
+ }
+ *irq = p->interrupts[0];
+ break;
+ }
+ default:
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+ "Resource isn't an IRQ\n"));
+ return_ACPI_STATUS(AE_OK);
+ }
+ return_ACPI_STATUS(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;
+
+ ACPI_FUNCTION_TRACE("acpi_pci_link_get_current");
+
+ if (!link || !link->handle)
+ return_VALUE(-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) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to read status\n"));
+ goto end;
+ }
+
+ if (!link->device->status.enabled) {
+ ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Link disabled\n"));
+ return_VALUE(0);
+ }
+ }
+
+ /*
+ * Query and parse _CRS to get the current IRQ assignment.
+ */
+
+ status = acpi_walk_resources(link->handle, METHOD_NAME__CRS,
+ acpi_pci_link_check_current, &irq);
+ if (ACPI_FAILURE(status)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _CRS\n"));
+ result = -ENODEV;
+ goto end;
+ }
+
+ if (acpi_strict && !irq) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "_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_VALUE(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};
+
+ ACPI_FUNCTION_TRACE("acpi_pci_link_set");
+
+ if (!link || !irq)
+ return_VALUE(-EINVAL);
+
+ resource = kmalloc( sizeof(*resource)+1, GFP_KERNEL);
+ if(!resource)
+ return_VALUE(-ENOMEM);
+
+ memset(resource, 0, sizeof(*resource)+1);
+ buffer.length = sizeof(*resource) +1;
+ buffer.pointer = resource;
+
+ switch(link->irq.resource_type) {
+ case ACPI_RSTYPE_IRQ:
+ resource->res.id = ACPI_RSTYPE_IRQ;
+ resource->res.length = sizeof(struct acpi_resource);
+ resource->res.data.irq.edge_level = link->irq.edge_level;
+ resource->res.data.irq.active_high_low = link->irq.active_high_low;
+ if (link->irq.edge_level == ACPI_EDGE_SENSITIVE)
+ resource->res.data.irq.shared_exclusive = ACPI_EXCLUSIVE;
+ else
+ resource->res.data.irq.shared_exclusive = ACPI_SHARED;
+ resource->res.data.irq.number_of_interrupts = 1;
+ resource->res.data.irq.interrupts[0] = irq;
+ break;
+
+ case ACPI_RSTYPE_EXT_IRQ:
+ resource->res.id = ACPI_RSTYPE_EXT_IRQ;
+ resource->res.length = sizeof(struct acpi_resource);
+ resource->res.data.extended_irq.producer_consumer = ACPI_CONSUMER;
+ resource->res.data.extended_irq.edge_level = link->irq.edge_level;
+ resource->res.data.extended_irq.active_high_low = link->irq.active_high_low;
+ if (link->irq.edge_level == ACPI_EDGE_SENSITIVE)
+ resource->res.data.irq.shared_exclusive = ACPI_EXCLUSIVE;
+ else
+ resource->res.data.irq.shared_exclusive = ACPI_SHARED;
+ resource->res.data.extended_irq.number_of_interrupts = 1;
+ resource->res.data.extended_irq.interrupts[0] = irq;
+ /* ignore resource_source, it's optional */
+ break;
+ default:
+ printk("ACPI BUG: resource_type %d\n", link->irq.resource_type);
+ result = -EINVAL;
+ goto end;
+
+ }
+ resource->end.id = ACPI_RSTYPE_END_TAG;
+
+ /* Attempt to set the resource */
+ status = acpi_set_current_resources(link->handle, &buffer);
+
+ /* check for total failure */
+ if (ACPI_FAILURE(status)) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _SRS\n"));
+ result = -ENODEV;
+ goto end;
+ }
+
+ /* Query _STA, set device->status */
+ result = acpi_bus_get_status(link->device);
+ if (result) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "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_VALUE(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;
+
+ ACPI_FUNCTION_TRACE("acpi_irq_penalty_init");
+
+ /*
+ * Update penalties to facilitate IRQ balancing.
+ */
+ list_for_each(node, &acpi_link.entries) {
+
+ link = list_entry(node, struct acpi_pci_link, node);
+ if (!link) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "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_fadt.sci_int] += PIRQ_PENALTY_PCI_USING;
+
+ return_VALUE(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;
+
+ ACPI_FUNCTION_TRACE("acpi_pci_link_allocate");
+
+ if (link->irq.initialized)
+ return_VALUE(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(PREFIX "Unable to set IRQ for %s [%s] (likely buggy ACPI BIOS).\n"
+ "Try pci=noacpi or acpi=off\n",
+ acpi_device_name(link->device),
+ acpi_device_bid(link->device));
+ return_VALUE(-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_VALUE(0);
+}
+
+/*
+ * acpi_pci_link_get_irq
+ * success: return IRQ >= 0
+ * failure: return -1
+ */
+
+int
+acpi_pci_link_get_irq (
+ acpi_handle handle,
+ int index,
+ int *edge_level,
+ int *active_high_low,
+ char **name)
+{
+ int result = 0;
+ struct acpi_device *device = NULL;
+ struct acpi_pci_link *link = NULL;
+
+ ACPI_FUNCTION_TRACE("acpi_pci_link_get_irq");
+
+ result = acpi_bus_get_device(handle, &device);
+ if (result) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link device\n"));
+ return_VALUE(-1);
+ }
+
+ link = (struct acpi_pci_link *) acpi_driver_data(device);
+ if (!link) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n"));
+ return_VALUE(-1);
+ }
+
+ /* TBD: Support multiple index (IRQ) entries per Link Device */
+ if (index) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid index %d\n", index));
+ return_VALUE(-1);
+ }
+
+ if (acpi_pci_link_allocate(link))
+ return_VALUE(-1);
+
+ if (!link->irq.active) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link active IRQ is 0!\n"));
+ return_VALUE(-1);
+ }
+
+ if (edge_level) *edge_level = link->irq.edge_level;
+ if (active_high_low) *active_high_low = link->irq.active_high_low;
+ if (name) *name = acpi_device_bid(link->device);
+ return_VALUE(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;
+
+ ACPI_FUNCTION_TRACE("acpi_pci_link_add");
+
+ if (!device)
+ return_VALUE(-EINVAL);
+
+ link = kmalloc(sizeof(struct acpi_pci_link), GFP_KERNEL);
+ if (!link)
+ return_VALUE(-ENOMEM);
+ memset(link, 0, sizeof(struct acpi_pci_link));
+
+ link->device = device;
+ link->handle = device->handle;
+ strcpy(acpi_device_name(device), ACPI_PCI_LINK_DEVICE_NAME);
+ strcpy(acpi_device_class(device), ACPI_PCI_LINK_CLASS);
+ acpi_driver_data(device) = link;
+
+ result = acpi_pci_link_get_possible(link);
+ if (result)
+ goto end;
+
+ /* query and set link->irq.active */
+ acpi_pci_link_get_current(link);
+
+ printk(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(link->handle, "_DIS", 0, NULL);
+
+ if (result)
+ kfree(link);
+
+ return_VALUE(result);
+}
+
+
+static int
+acpi_pci_link_resume (
+ struct acpi_pci_link *link)
+{
+ ACPI_FUNCTION_TRACE("acpi_pci_link_resume");
+
+ if (link->irq.active && link->irq.initialized)
+ return_VALUE(acpi_pci_link_set(link, link->irq.active));
+ else
+ return_VALUE(0);
+}
+
+
+static int
+irqrouter_resume(
+ struct sys_device *dev)
+{
+ struct list_head *node = NULL;
+ struct acpi_pci_link *link = NULL;
+
+ ACPI_FUNCTION_TRACE("irqrouter_resume");
+
+ list_for_each(node, &acpi_link.entries) {
+
+ link = list_entry(node, struct acpi_pci_link, node);
+ if (!link) {
+ ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n"));
+ continue;
+ }
+
+ acpi_pci_link_resume(link);
+ }
+ return_VALUE(0);
+}
+
+
+static int
+acpi_pci_link_remove (
+ struct acpi_device *device,
+ int type)
+{
+ struct acpi_pci_link *link = NULL;
+
+ ACPI_FUNCTION_TRACE("acpi_pci_link_remove");
+
+ if (!device || !acpi_driver_data(device))
+ return_VALUE(-EINVAL);
+
+ link = (struct acpi_pci_link *) acpi_driver_data(device);
+
+ /* TBD: Acquire/release lock */
+ list_del(&link->node);
+
+ kfree(link);
+
+ return_VALUE(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)
+{
+ 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);
+
+
+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;
+
+ ACPI_FUNCTION_TRACE("irqrouter_init_sysfs");
+
+ if (acpi_disabled || acpi_noirq)
+ return_VALUE(0);
+
+ error = sysdev_class_register(&irqrouter_sysdev_class);
+ if (!error)
+ error = sysdev_register(&device_irqrouter);
+
+ return_VALUE(error);
+}
+
+device_initcall(irqrouter_init_sysfs);
+
+
+static int __init acpi_pci_link_init (void)
+{
+ ACPI_FUNCTION_TRACE("acpi_pci_link_init");
+
+ if (acpi_noirq)
+ return_VALUE(0);
+
+ acpi_link.count = 0;
+ INIT_LIST_HEAD(&acpi_link.entries);
+
+ if (acpi_bus_register_driver(&acpi_pci_link_driver) < 0)
+ return_VALUE(-ENODEV);
+
+ return_VALUE(0);
+}
+
+subsys_initcall(acpi_pci_link_init);
