Release 4.10 drivers/acpi/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.
 *
 * ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
 *
 * 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/syscore_ops.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/pm.h>
#include <linux/pci.h>
#include <linux/mutex.h>
#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/irq.h>

#include "internal.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,
			     const struct acpi_device_id *not_used);
static void acpi_pci_link_remove(struct acpi_device *device);


static const struct acpi_device_id link_device_ids[] = {
	{"PNP0C0F", 0},
	{"", 0},
};


static struct acpi_scan_handler pci_link_handler = {
	.ids = link_device_ids,
	.attach = acpi_pci_link_add,
	.detach = 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 {
	
u32 active;		/* Current IRQ */
	
u8 triggering;		/* All IRQs */
	
u8 polarity;		/* All IRQs */
	
u8 resource_type;
	
u8 possible_count;
	
u32 possible[ACPI_PCI_LINK_MAX_POSSIBLE];
	
u8 initialized:1;
	
u8 reserved:7;
};


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

static LIST_HEAD(acpi_link_list);
static DEFINE_MUTEX(acpi_link_lock);


static int sci_irq = -1, sci_penalty;

/* --------------------------------------------------------------------------
                            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;

	switch (resource->type) {
	case ACPI_RESOURCE_TYPE_START_DEPENDENT:
	case ACPI_RESOURCE_TYPE_END_TAG:
		return AE_OK;
	case ACPI_RESOURCE_TYPE_IRQ:
		{
			struct acpi_resource_irq *p = &resource->data.irq;
			if (!p || !p->interrupt_count) {
				ACPI_DEBUG_PRINT((ACPI_DB_INFO,
						  "Blank _PRS 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 _PRS 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 _PRS 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 _PRS 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 "_PRS resource type 0x%x isn't an IRQ\n",
		       resource->type);
		return AE_OK;
	}

	return AE_CTRL_TERMINATE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
andy grover
andy grover
252
76.83%
6
42.86%
len brown
len brown
32
9.76%
5
35.71%
robert moore
robert moore
18
5.49%
1
7.14%
bjorn helgaas
bjorn helgaas
16
4.88%
1
7.14%
patrick mochel
patrick mochel
10
3.05%
1
7.14%
Total
328
100.00%
14
100.00%



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

	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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
andy grover
andy grover
62
84.93%
3
50.00%
patrick mochel
patrick mochel
6
8.22%
2
33.33%
thomas renninger
thomas renninger
5
6.85%
1
16.67%
Total
73
100.00%
6
100.00%



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

	switch (resource->type) {
	case ACPI_RESOURCE_TYPE_START_DEPENDENT:
	case ACPI_RESOURCE_TYPE_END_TAG:
		return AE_OK;
	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 _CRS 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 _CRS EXT IRQ resource\n");
				return AE_OK;
			}
			*irq = p->interrupts[0];
			break;
		}
		break;
	default:
		printk(KERN_ERR PREFIX "_CRS resource type 0x%x isn't an IRQ\n",
		       resource->type);
		return AE_OK;
	}

	return AE_CTRL_TERMINATE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
andy grover
andy grover
119
75.80%
4
30.77%
len brown
len brown
13
8.28%
6
46.15%
bjorn helgaas
bjorn helgaas
12
7.64%
1
7.69%
patrick mochel
patrick mochel
8
5.10%
1
7.69%
robert moore
robert moore
5
3.18%
1
7.69%
Total
157
100.00%
13
100.00%

/*
 * 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;
	int irq = 0;

	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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
andy grover
andy grover
155
84.24%
4
44.44%
len brown
len brown
18
9.78%
2
22.22%
patrick mochel
patrick mochel
6
3.26%
2
22.22%
thomas renninger
thomas renninger
5
2.72%
1
11.11%
Total
184
100.00%
9
100.00%



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

	if (!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;
	resource->end.length = sizeof(struct acpi_resource);

	/* 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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
andy grover
andy grover
310
54.77%
7
31.82%
len brown
len brown
198
34.98%
7
31.82%
robert moore
robert moore
21
3.71%
1
4.55%
yinghai lu
yinghai lu
12
2.12%
1
4.55%
thomas renninger
thomas renninger
10
1.77%
1
4.55%
patrick mochel
patrick mochel
8
1.41%
2
9.09%
jiri kosina
jiri kosina
5
0.88%
1
4.55%
burman yan
burman yan
1
0.18%
1
4.55%
dave jones
dave jones
1
0.18%
1
4.55%
Total
566
100.00%
22
100.00%

/* --------------------------------------------------------------------------
                            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_ISA_IRQS	16


#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_isa_irq_penalty[ACPI_MAX_ISA_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 */
	0,				/* IRQ9  PCI, often acpi */
	0,				/* IRQ10 PCI */
	0,				/* 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 */
};



static int acpi_irq_pci_sharing_penalty(int irq)
{
	struct acpi_pci_link *link;
	int penalty = 0;
	int i;

	list_for_each_entry(link, &acpi_link_list, list) {
		/*
                 * If a link is active, penalize its IRQ heavily
                 * so we try to choose a different IRQ.
                 */
		if (link->irq.active && link->irq.active == irq)
			penalty += PIRQ_PENALTY_PCI_USING;

		/*
                 * penalize the IRQs PCI might use, but not as severely.
                 */
		for (i = 0; i < link->irq.possible_count; i++)
			if (link->irq.possible[i] == irq)
				penalty += PIRQ_PENALTY_PCI_POSSIBLE /
					link->irq.possible_count;
	}

	return penalty;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sinan kaya
sinan kaya
97
100.00%
2
100.00%
Total
97
100.00%
2
100.00%



static int acpi_irq_get_penalty(int irq)
{
	int penalty = 0;

	if (irq == sci_irq)
		penalty += sci_penalty;

	if (irq < ACPI_MAX_ISA_IRQS)
		return penalty + acpi_isa_irq_penalty[irq];

	return penalty + acpi_irq_pci_sharing_penalty(irq);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sinan kaya
sinan kaya
46
100.00%
3
100.00%
Total
46
100.00%
3
100.00%



int __init acpi_irq_penalty_init(void)
{
	struct acpi_pci_link *link;
	int i;

	/*
         * Update penalties to facilitate IRQ balancing.
         */
	list_for_each_entry(link, &acpi_link_list, list) {

		/*
                 * 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_IRQS)
					acpi_isa_irq_penalty[link->irq.
							 possible[i]] +=
					    penalty;
			}

		} else if (link->irq.active &&
				(link->irq.active < ACPI_MAX_ISA_IRQS)) {
			acpi_isa_irq_penalty[link->irq.active] +=
			    PIRQ_PENALTY_PCI_POSSIBLE;
		}
	}

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sinan kaya
sinan kaya
130
100.00%
1
100.00%
Total
130
100.00%
1
100.00%


static int acpi_irq_balance = -1;	
/* 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_get_penalty(irq) >
			    acpi_irq_get_penalty(link->irq.possible[i]))
				irq = link->irq.possible[i];
		}
	}
	if (acpi_irq_get_penalty(irq) >= PIRQ_PENALTY_ISA_ALWAYS) {
		printk(KERN_ERR PREFIX "No IRQ available for %s [%s]. "
			    "Try pci=noacpi or acpi=off\n",
			    acpi_device_name(link->device),
			    acpi_device_bid(link->device));
		return -ENODEV;
	}

	/* 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 {
		if (link->irq.active < ACPI_MAX_ISA_IRQS)
			acpi_isa_irq_penalty[link->irq.active] +=
				PIRQ_PENALTY_PCI_USING;

		printk(KERN_WARNING 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;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
andy grover
andy grover
132
40.74%
5
25.00%
len brown
len brown
102
31.48%
6
30.00%
sinan kaya
sinan kaya
30
9.26%
2
10.00%
li shaohua
li shaohua
24
7.41%
2
10.00%
jiang liu
jiang liu
23
7.10%
1
5.00%
patrick mochel
patrick mochel
6
1.85%
1
5.00%
frank seidel
frank seidel
5
1.54%
1
5.00%
thomas renninger
thomas renninger
1
0.31%
1
5.00%
nathan bryant
nathan bryant
1
0.31%
1
5.00%
Total
324
100.00%
20
100.00%

/*
 * 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;
	struct acpi_device *device;
	struct acpi_pci_link *link;

	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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
andy grover
andy grover
110
47.01%
4
33.33%
li shaohua
li shaohua
50
21.37%
1
8.33%
len brown
len brown
47
20.09%
3
25.00%
patrick mochel
patrick mochel
14
5.98%
1
8.33%
robert moore
robert moore
8
3.42%
1
8.33%
ingo molnar
ingo molnar
4
1.71%
1
8.33%
bjorn helgaas
bjorn helgaas
1
0.43%
1
8.33%
Total
234
100.00%
12
100.00%

/*
 * 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;
	struct acpi_pci_link *link;
	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_evaluate_object(link->device->handle, "_DIS", NULL, NULL);

	mutex_unlock(&acpi_link_lock);
	return (link->irq.active);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
li shaohua
li shaohua
133
78.70%
2
22.22%
len brown
len brown
13
7.69%
2
22.22%
patrick mochel
patrick mochel
12
7.10%
2
22.22%
andy grover
andy grover
6
3.55%
1
11.11%
ingo molnar
ingo molnar
3
1.78%
1
11.11%
donald d dugger
donald d dugger
2
1.18%
1
11.11%
Total
169
100.00%
9
100.00%

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



static int acpi_pci_link_add(struct acpi_device *device,
			     const struct acpi_device_id *not_used)
{
	int result;
	struct acpi_pci_link *link;
	int i;
	int found = 0;

	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);
	device->driver_data = 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(KERN_CONT " *%d", link->irq.possible[i]);
			found = 1;
		} else
			printk(KERN_CONT " %d", link->irq.possible[i]);
	}

	printk(KERN_CONT ")");

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

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

	printk(KERN_CONT "\n");

	list_add_tail(&link->list, &acpi_link_list);

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

	if (result)
		kfree(link);

	return result < 0 ? result : 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
andy grover
andy grover
195
66.55%
3
16.67%
len brown
len brown
50
17.06%
3
16.67%
rafael j. wysocki
rafael j. wysocki
12
4.10%
1
5.56%
li shaohua
li shaohua
10
3.41%
1
5.56%
kay sievers
kay sievers
6
2.05%
1
5.56%
patrick mochel
patrick mochel
5
1.71%
2
11.11%
dan aloni
dan aloni
4
1.37%
1
5.56%
donald d dugger
donald d dugger
2
0.68%
1
5.56%
andrew morton
andrew morton
2
0.68%
1
5.56%
pavel machek
pavel machek
2
0.68%
1
5.56%
bjorn helgaas
bjorn helgaas
2
0.68%
1
5.56%
ingo molnar
ingo molnar
2
0.68%
1
5.56%
burman yan
burman yan
1
0.34%
1
5.56%
Total
293
100.00%
18
100.00%



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));

	return 0;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
linus torvalds
linus torvalds
38
82.61%
1
33.33%
patrick mochel
patrick mochel
6
13.04%
1
33.33%
andy grover
andy grover
2
4.35%
1
33.33%
Total
46
100.00%
3
100.00%



static void irqrouter_resume(void)
{
	struct acpi_pci_link *link;

	list_for_each_entry(link, &acpi_link_list, list) {
		acpi_pci_link_resume(link);
	}
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
nathan bryant
nathan bryant
16
57.14%
1
20.00%
bjorn helgaas
bjorn helgaas
4
14.29%
1
20.00%
linus torvalds
linus torvalds
4
14.29%
1
20.00%
li shaohua
li shaohua
2
7.14%
1
20.00%
rafael j. wysocki
rafael j. wysocki
2
7.14%
1
20.00%
Total
28
100.00%
5
100.00%



static void acpi_pci_link_remove(struct acpi_device *device)
{
	struct acpi_pci_link *link;

	link = acpi_driver_data(device);

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

	kfree(link);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
andy grover
andy grover
33
68.75%
2
28.57%
li shaohua
li shaohua
10
20.83%
1
14.29%
ingo molnar
ingo molnar
2
4.17%
1
14.29%
rafael j. wysocki
rafael j. wysocki
1
2.08%
1
14.29%
nathan bryant
nathan bryant
1
2.08%
1
14.29%
bjorn helgaas
bjorn helgaas
1
2.08%
1
14.29%
Total
48
100.00%
7
100.00%

/*
 * modify acpi_isa_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;
		int new_penalty;

		retval = get_option(&str, &irq);

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

		/* see if this is a ISA IRQ */
		if ((irq < 0) || (irq >= ACPI_MAX_ISA_IRQS))
			continue;

		if (used)
			new_penalty = acpi_isa_irq_penalty[irq] +
					PIRQ_PENALTY_ISA_USED;
		else
			new_penalty = 0;

		acpi_isa_irq_penalty[irq] = new_penalty;
		if (retval != 2)	/* no next number */
			break;
	}
	return 1;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
len brown
len brown
79
71.17%
1
20.00%
sinan kaya
sinan kaya
23
20.72%
3
60.00%
rafael j. wysocki
rafael j. wysocki
9
8.11%
1
20.00%
Total
111
100.00%
5
100.00%

/*
 * 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 ((irq >= 0) && (irq < ARRAY_SIZE(acpi_isa_irq_penalty)))
		acpi_isa_irq_penalty[irq] +=
		  (active ? PIRQ_PENALTY_ISA_USED : PIRQ_PENALTY_PCI_USING);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sinan kaya
sinan kaya
15
36.59%
5
55.56%
rafael j. wysocki
rafael j. wysocki
11
26.83%
1
11.11%
len brown
len brown
7
17.07%
1
11.11%
li shaohua
li shaohua
5
12.20%
1
11.11%
bjorn helgaas
bjorn helgaas
3
7.32%
1
11.11%
Total
41
100.00%
9
100.00%



bool acpi_isa_irq_available(int irq)
{
	return irq >= 0 && (irq >= ARRAY_SIZE(acpi_isa_irq_penalty) ||
		    acpi_irq_get_penalty(irq) < PIRQ_PENALTY_ISA_ALWAYS);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
jiang liu
jiang liu
19
65.52%
1
20.00%
sinan kaya
sinan kaya
5
17.24%
3
60.00%
rafael j. wysocki
rafael j. wysocki
5
17.24%
1
20.00%
Total
29
100.00%
5
100.00%



void acpi_penalize_sci_irq(int irq, int trigger, int polarity)
{
	sci_irq = irq;

	if (trigger == ACPI_MADT_TRIGGER_LEVEL &&
	    polarity == ACPI_MADT_POLARITY_ACTIVE_LOW)
		sci_penalty = PIRQ_PENALTY_PCI_USING;
	else
		sci_penalty = PIRQ_PENALTY_ISA_ALWAYS;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
sinan kaya
sinan kaya
37
100.00%
1
100.00%
Total
37
100.00%
1
100.00%

/*
 * 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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
len brown
len brown
19
100.00%
1
100.00%
Total
19
100.00%
1
100.00%

__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);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
len brown
len brown
19
100.00%
1
100.00%
Total
19
100.00%
1
100.00%

__setup("acpi_irq_pci=", acpi_irq_pci);



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

Contributors
Person
Tokens
Prop
Commits
CommitProp
len brown
len brown
18
100.00%
1
100.00%
Total
18
100.00%
1
100.00%

__setup("acpi_irq_nobalance", acpi_irq_nobalance_set);



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

Contributors
Person
Tokens
Prop
Commits
CommitProp
len brown
len brown
17
94.44%
1
50.00%
roel kluin
roel kluin
1
5.56%
1
50.00%
Total
18
100.00%
2
100.00%

__setup("acpi_irq_balance", acpi_irq_balance_set);


static struct syscore_ops irqrouter_syscore_ops = {
	.resume = irqrouter_resume,
};



void __init acpi_pci_link_init(void)
{
	if (acpi_noirq)
		return;

	if (acpi_irq_balance == -1) {
		/* no command line switch: enable balancing in IOAPIC mode */
		if (acpi_irq_model == ACPI_IRQ_MODEL_IOAPIC)
			acpi_irq_balance = 1;
		else
			acpi_irq_balance = 0;
	}
	register_syscore_ops(&irqrouter_syscore_ops);
	acpi_scan_add_handler(&pci_link_handler);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
bjorn helgaas
bjorn helgaas
25
50.00%
1
20.00%
andy grover
andy grover
9
18.00%
1
20.00%
rafael j. wysocki
rafael j. wysocki
9
18.00%
1
20.00%
patrick mochel
patrick mochel
6
12.00%
1
20.00%
nathan bryant
nathan bryant
1
2.00%
1
20.00%
Total
50
100.00%
5
100.00%

Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
andy grover
andy grover
1522
44.40%
10
12.50%
len brown
len brown
726
21.18%
19
23.75%
sinan kaya
sinan kaya
404
11.79%
11
13.75%
li shaohua
li shaohua
254
7.41%
4
5.00%
patrick mochel
patrick mochel
103
3.00%
4
5.00%
bjorn helgaas
bjorn helgaas
73
2.13%
5
6.25%
rafael j. wysocki
rafael j. wysocki
67
1.95%
3
3.75%
robert moore
robert moore
54
1.58%
1
1.25%
linus torvalds
linus torvalds
44
1.28%
1
1.25%
jiang liu
jiang liu
42
1.23%
1
1.25%
thomas renninger
thomas renninger
42
1.23%
2
2.50%
nathan bryant
nathan bryant
28
0.82%
1
1.25%
ingo molnar
ingo molnar
15
0.44%
1
1.25%
yinghai lu
yinghai lu
12
0.35%
1
1.25%
kay sievers
kay sievers
7
0.20%
2
2.50%
frank seidel
frank seidel
5
0.15%
1
1.25%
jiri kosina
jiri kosina
5
0.15%
1
1.25%
donald d dugger
donald d dugger
4
0.12%
1
1.25%
dan aloni
dan aloni
4
0.12%
1
1.25%
tejun heo
tejun heo
3
0.09%
1
1.25%
rashika kheria
rashika kheria
3
0.09%
1
1.25%
andrew morton
andrew morton
2
0.06%
1
1.25%
burman yan
burman yan
2
0.06%
1
1.25%
pavel machek
pavel machek
2
0.06%
1
1.25%
dave jones
dave jones
1
0.03%
1
1.25%
adrian bunk
adrian bunk
1
0.03%
1
1.25%
lv zheng
lv zheng
1
0.03%
1
1.25%
roel kluin
roel kluin
1
0.03%
1
1.25%
marton nemeth
marton nemeth
1
0.03%
1
1.25%
Total
3428
100.00%
80
100.00%
Directory: drivers/acpi

Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.