patch-2.4.22 linux-2.4.22/drivers/acpi/pci_link.c

• Lines: 630
• Date: 2003-08-25 04:44:41.000000000 -0700
• Orig file: linux-2.4.21/drivers/acpi/pci_link.c
• Orig date: 1969-12-31 16:00:00.000000000 -0800

diff -urN linux-2.4.21/drivers/acpi/pci_link.c linux-2.4.22/drivers/acpi/pci_link.c
@@ -0,0 +1,629 @@
+/*
+ *  pci_link.c - ACPI PCI Interrupt Link Device Driver ($Revision: 35 $)
+ *
+ *  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/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 PREFIX			"ACPI: "
+
+
+#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			setonboot;
+	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
+   -------------------------------------------------------------------------- */
+
+static acpi_status
+acpi_pci_link_check_possible (
+	struct acpi_resource	*resource,
+	void			*context)
+{
+	struct acpi_pci_link	*link = (struct acpi_pci_link *) context;
+	int			i = 0;
+
+	ACPI_FUNCTION_TRACE("acpi_pci_link_check_possible");
+
+	switch (resource->id) {
+	case ACPI_RSTYPE_START_DPF:
+		return 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 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;
+		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 IRQ resource\n"));
+			return 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;
+		break;
+	}
+	default:
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 
+			"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;
+
+	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) {
+			ACPI_DEBUG_PRINT((ACPI_DB_WARN,
+				"Blank IRQ resource\n"));
+			return 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) {
+			ACPI_DEBUG_PRINT((ACPI_DB_WARN,
+				"Blank IRQ resource\n"));
+			return AE_OK;
+		}
+		*irq = p->interrupts[0];
+		break;
+	}
+	default:
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
+			"Resource isn't an IRQ\n"));
+		return AE_OK;
+	}
+	return AE_CTRL_TERMINATE;
+}
+
+
+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;
+
+	/* Make sure the link is enabled (no use querying if it isn't). */
+	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 (!irq) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "No IRQ resource found\n"));
+		result = -ENODEV;
+		goto end;
+	}
+
+	/*
+	 * Note that we don't validate that the current IRQ (_CRS) exists
+	 * within the possible IRQs (_PRS): we blindly assume that whatever
+	 * IRQ a boot-enabled Link device is set to is the correct one.
+	 * (Required to support systems such as the Toshiba 5005-S504.)
+	 */
+	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 = {sizeof(resource)+1, &resource};
+	int			i = 0;
+	int			valid = 0;
+
+	ACPI_FUNCTION_TRACE("acpi_pci_link_set");
+
+	if (!link || !irq)
+		return_VALUE(-EINVAL);
+
+	/* We don't check irqs the first time around */
+	if (link->irq.setonboot) {
+		/* See if we're already at the target IRQ. */
+		if (irq == link->irq.active)
+			return_VALUE(0);
+
+		/* Make sure the target IRQ in the list of possible IRQs. */
+		for (i=0; i<link->irq.possible_count; i++) {
+			if (irq == link->irq.possible[i])
+				valid = 1;
+		}
+		if (!valid) {
+			ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Target IRQ %d invalid\n", irq));
+			return_VALUE(-EINVAL);
+		}
+	}
+
+	memset(&resource, 0, sizeof(resource));
+
+	/* NOTE: PCI interrupts are always level / active_low / shared. But not all
+	   interrupts > 15 are PCI interrupts. Rely on the ACPI IRQ definition for 
+	   parameters */
+	if (irq <= 15) {
+		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;
+		resource.res.data.irq.shared_exclusive = ACPI_SHARED;
+		resource.res.data.irq.number_of_interrupts = 1;
+		resource.res.data.irq.interrupts[0] = irq;
+	}
+	else {
+		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;
+		resource.res.data.extended_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 */
+	}
+	resource.end.id = ACPI_RSTYPE_END_TAG;
+
+	/* Attempt to set the resource */
+	status = acpi_set_current_resources(link->handle, &buffer);
+	if (ACPI_FAILURE(status)) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Error evaluating _SRS\n"));
+		return_VALUE(-ENODEV);
+	}
+
+	/* Make sure the device is enabled. */
+	result = acpi_bus_get_status(link->device);
+	if (result) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Unable to read status\n"));
+		return_VALUE(result);
+	}
+	if (!link->device->status.enabled) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link disabled\n"));
+		return_VALUE(-ENODEV);
+	}
+
+	/* Make sure the active IRQ is the one we requested. */
+	result = acpi_pci_link_get_current(link);
+	if (result) {
+		return_VALUE(result);
+	}
+   
+	if (link->irq.active != irq) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, 
+			"Attempt to enable at IRQ %d resulted in IRQ %d\n", 
+			irq, link->irq.active));
+		link->irq.active = 0;
+		acpi_ut_evaluate_object (link->handle, "_DIS", 0, NULL);	   
+		return_VALUE(-ENODEV);
+	}
+
+	ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Set IRQ %d\n", link->irq.active));
+	
+	return_VALUE(0);
+}
+
+
+/* --------------------------------------------------------------------------
+                            PCI Link IRQ Management
+   -------------------------------------------------------------------------- */
+
+#define ACPI_MAX_IRQS		256
+#define ACPI_MAX_ISA_IRQ	16
+
+/*
+ * IRQ penalties are used to promote PCI IRQ balancing.  We set each ISA-
+ * possible IRQ (0-15) with a default penalty relative to its feasibility
+ * for PCI's use:
+ *
+ *   Never use:		0, 1, 2 (timer, keyboard, and cascade)
+ *   Avoid using:	13, 14, and 15 (FP error and IDE)
+ *   Penalize:		3, 4, 6, 7, 12 (known ISA uses)
+ *
+ * Thus we're left with IRQs 5, 9, 10, 11, and everything above 15 (IO[S]APIC)
+ * as 'best bets' for PCI use.
+ */
+
+static int acpi_irq_penalty[ACPI_MAX_IRQS] = {
+	1000000,  1000000,  1000000,    10000, 
+	  10000,        0,    10000,    10000,
+	  10000,        0,        0,        0, 
+	  10000,   100000,   100000,   100000,
+};
+
+
+int
+acpi_pci_link_check (void)
+{
+	struct list_head	*node = NULL;
+	struct acpi_pci_link    *link = NULL;
+	int			i = 0;
+
+	ACPI_FUNCTION_TRACE("acpi_pci_link_check");
+
+	/*
+	 * 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;
+		}
+
+		if (link->irq.active)
+			acpi_irq_penalty[link->irq.active] += 100;
+		else if (link->irq.possible_count) {
+			int penalty = 100 / 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;
+			}
+		}
+	}
+
+	return_VALUE(0);
+}
+
+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.setonboot)
+		return_VALUE(0);
+
+	if (link->irq.active) {
+		irq = link->irq.active;
+	} else {
+		irq = link->irq.possible[0];
+	}
+
+		/* 
+		 * 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). Aborting ACPI-based IRQ routing. 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] += 100;
+		printk(PREFIX "%s [%s] enabled at IRQ %d\n", 
+			acpi_device_name(link->device),
+			acpi_device_bid(link->device), link->irq.active);
+	}
+
+	link->irq.setonboot = 1;
+	return_VALUE(0);
+}
+
+
+int
+acpi_pci_link_get_irq (
+	acpi_handle		handle,
+	int			index,
+	int*			edge_level,
+	int*			active_high_low)
+{
+	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(0);
+	}
+
+	link = (struct acpi_pci_link *) acpi_driver_data(device);
+	if (!link) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid link context\n"));
+		return_VALUE(0);
+	}
+
+	/* TBD: Support multiple index (IRQ) entries per Link Device */
+	if (index) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Invalid index %d\n", index));
+		return_VALUE(0);
+	}
+
+	if (acpi_pci_link_allocate(link)) {
+		return -ENODEV;
+	}
+	   
+	if (!link->irq.active) {
+		ACPI_DEBUG_PRINT((ACPI_DB_ERROR, "Link disabled\n"));
+		return_VALUE(0);
+	}
+
+	if (edge_level) *edge_level = link->irq.edge_level;
+	if (active_high_low) *active_high_low = link->irq.active_high_low;
+	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;
+	sprintf(acpi_device_name(device), "%s", ACPI_PCI_LINK_DEVICE_NAME);
+	sprintf(acpi_device_class(device), "%s", ACPI_PCI_LINK_CLASS);
+	acpi_driver_data(device) = link;
+
+	result = acpi_pci_link_get_possible(link);
+	if (result)
+		goto end;
+
+	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]);
+	}
+	if (!link->irq.active)
+		printk(", disabled");
+	else if (!found)
+		printk(", enabled at IRQ %d", link->irq.active);
+	printk(")\n");
+
+	/* TBD: Acquire/release lock */
+	list_add_tail(&link->node, &acpi_link.entries);
+	acpi_link.count++;
+
+end:
+	if (result)
+		kfree(link);
+
+	return_VALUE(result);
+}
+
+
+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);
+}
+
+
+int __init
+acpi_pci_link_init (void)
+{
+	ACPI_FUNCTION_TRACE("acpi_pci_link_init");
+
+	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);
+}