[linux.git] / drivers / acpi / ioapic.c

/*
 * IOAPIC/IOxAPIC/IOSAPIC driver
 *
 * Copyright (C) 2009 Fujitsu Limited.
 * (c) Copyright 2009 Hewlett-Packard Development Company, L.P.
 *
 * Copyright (C) 2014 Intel Corporation
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 *
 * Based on original drivers/pci/ioapic.c
 *	Yinghai Lu <[email protected]>
 *	Jiang Liu <[email protected]>
 */

/*
 * This driver manages I/O APICs added by hotplug after boot.
 * We try to claim all I/O APIC devices, but those present at boot were
 * registered when we parsed the ACPI MADT.
 */

#define pr_fmt(fmt) "ACPI: IOAPIC: " fmt

#include <linux/slab.h>
#include <linux/acpi.h>
#include <linux/pci.h>
#include <acpi/acpi.h>

struct acpi_pci_ioapic {
	acpi_handle	root_handle;
	acpi_handle	handle;
	u32		gsi_base;
	struct resource	res;
	struct pci_dev	*pdev;
	struct list_head list;
};

static LIST_HEAD(ioapic_list);
static DEFINE_MUTEX(ioapic_list_lock);

static acpi_status setup_res(struct acpi_resource *acpi_res, void *data)
{
	struct resource *res = data;
	struct resource_win win;

	/*
	 * We might assign this to 'res' later, make sure all pointers are
	 * cleared before the resource is added to the global list
	 */
	memset(&win, 0, sizeof(win));

	res->flags = 0;
	if (acpi_dev_filter_resource_type(acpi_res, IORESOURCE_MEM))
		return AE_OK;

	if (!acpi_dev_resource_memory(acpi_res, res)) {
		if (acpi_dev_resource_address_space(acpi_res, &win) ||
		    acpi_dev_resource_ext_address_space(acpi_res, &win))
			*res = win.res;
	}
	if ((res->flags & IORESOURCE_PREFETCH) ||
	    (res->flags & IORESOURCE_DISABLED))
		res->flags = 0;

	return AE_CTRL_TERMINATE;
}

static bool acpi_is_ioapic(acpi_handle handle, char **type)
{
	acpi_status status;
	struct acpi_device_info *info;
	char *hid = NULL;
	bool match = false;

	if (!acpi_has_method(handle, "_GSB"))
		return false;

	status = acpi_get_object_info(handle, &info);
	if (ACPI_SUCCESS(status)) {
		if (info->valid & ACPI_VALID_HID)
			hid = info->hardware_id.string;
		if (hid) {
			if (strcmp(hid, "ACPI0009") == 0) {
				*type = "IOxAPIC";
				match = true;
			} else if (strcmp(hid, "ACPI000A") == 0) {
				*type = "IOAPIC";
				match = true;
			}
		}
		kfree(info);
	}

	return match;
}

static acpi_status handle_ioapic_add(acpi_handle handle, u32 lvl,
				     void *context, void **rv)
{
	acpi_status status;
	unsigned long long gsi_base;
	struct acpi_pci_ioapic *ioapic;
	struct pci_dev *dev = NULL;
	struct resource *res = NULL, *pci_res = NULL, *crs_res;
	char *type = NULL;

	if (!acpi_is_ioapic(handle, &type))
		return AE_OK;

	mutex_lock(&ioapic_list_lock);
	list_for_each_entry(ioapic, &ioapic_list, list)
		if (ioapic->handle == handle) {
			mutex_unlock(&ioapic_list_lock);
			return AE_OK;
		}

	status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsi_base);
	if (ACPI_FAILURE(status)) {
		acpi_handle_warn(handle, "failed to evaluate _GSB method\n");
		goto exit;
	}

	ioapic = kzalloc(sizeof(*ioapic), GFP_KERNEL);
	if (!ioapic) {
		pr_err("cannot allocate memory for new IOAPIC\n");
		goto exit;
	} else {
		ioapic->root_handle = (acpi_handle)context;
		ioapic->handle = handle;
		ioapic->gsi_base = (u32)gsi_base;
		INIT_LIST_HEAD(&ioapic->list);
	}

	if (acpi_ioapic_registered(handle, (u32)gsi_base))
		goto done;

	dev = acpi_get_pci_dev(handle);
	if (dev && pci_resource_len(dev, 0)) {
		if (pci_enable_device(dev) < 0)
			goto exit_put;
		pci_set_master(dev);
		if (pci_request_region(dev, 0, type))
			goto exit_disable;
		pci_res = &dev->resource[0];
		ioapic->pdev = dev;
	} else {
		pci_dev_put(dev);
		dev = NULL;
	}

	crs_res = &ioapic->res;
	acpi_walk_resources(handle, METHOD_NAME__CRS, setup_res, crs_res);
	crs_res->name = type;
	crs_res->flags |= IORESOURCE_BUSY;
	if (crs_res->flags == 0) {
		acpi_handle_warn(handle, "failed to get resource\n");
		goto exit_release;
	} else if (insert_resource(&iomem_resource, crs_res)) {
		acpi_handle_warn(handle, "failed to insert resource\n");
		goto exit_release;
	}

	/* try pci resource first, then "_CRS" resource */
	res = pci_res;
	if (!res || !res->flags)
		res = crs_res;

	if (acpi_register_ioapic(handle, res->start, (u32)gsi_base)) {
		acpi_handle_warn(handle, "failed to register IOAPIC\n");
		goto exit_release;
	}
done:
	list_add(&ioapic->list, &ioapic_list);
	mutex_unlock(&ioapic_list_lock);

	if (dev)
		dev_info(&dev->dev, "%s at %pR, GSI %u\n",
			 type, res, (u32)gsi_base);
	else
		acpi_handle_info(handle, "%s at %pR, GSI %u\n",
				 type, res, (u32)gsi_base);

	return AE_OK;

exit_release:
	if (dev)
		pci_release_region(dev, 0);
	if (ioapic->res.flags && ioapic->res.parent)
		release_resource(&ioapic->res);
exit_disable:
	if (dev)
		pci_disable_device(dev);
exit_put:
	pci_dev_put(dev);
	kfree(ioapic);
exit:
	mutex_unlock(&ioapic_list_lock);
	*(acpi_status *)rv = AE_ERROR;
	return AE_OK;
}

int acpi_ioapic_add(acpi_handle root_handle)
{
	acpi_status status, retval = AE_OK;

	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, root_handle,
				     UINT_MAX, handle_ioapic_add, NULL,
				     root_handle, (void **)&retval);

	return ACPI_SUCCESS(status) && ACPI_SUCCESS(retval) ? 0 : -ENODEV;
}

void pci_ioapic_remove(struct acpi_pci_root *root)
{
	struct acpi_pci_ioapic *ioapic, *tmp;

	mutex_lock(&ioapic_list_lock);
	list_for_each_entry_safe(ioapic, tmp, &ioapic_list, list) {
		if (root->device->handle != ioapic->root_handle)
			continue;
		if (ioapic->pdev) {
			pci_release_region(ioapic->pdev, 0);
			pci_disable_device(ioapic->pdev);
			pci_dev_put(ioapic->pdev);
		}
	}
	mutex_unlock(&ioapic_list_lock);
}

int acpi_ioapic_remove(struct acpi_pci_root *root)
{
	int retval = 0;
	struct acpi_pci_ioapic *ioapic, *tmp;

	mutex_lock(&ioapic_list_lock);
	list_for_each_entry_safe(ioapic, tmp, &ioapic_list, list) {
		if (root->device->handle != ioapic->root_handle)
			continue;
		if (acpi_unregister_ioapic(ioapic->handle, ioapic->gsi_base))
			retval = -EBUSY;
		if (ioapic->res.flags && ioapic->res.parent)
			release_resource(&ioapic->res);
		list_del(&ioapic->list);
		kfree(ioapic);
	}
	mutex_unlock(&ioapic_list_lock);

	return retval;
}
Commit	Line	Data
c183619b JL	1	/*
	2	* IOAPIC/IOxAPIC/IOSAPIC driver
	3	*
	4	* Copyright (C) 2009 Fujitsu Limited.
	5	* (c) Copyright 2009 Hewlett-Packard Development Company, L.P.
	6	*
	7	* Copyright (C) 2014 Intel Corporation
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*
	13	* Based on original drivers/pci/ioapic.c
	14	* Yinghai Lu <[email protected]>
	15	* Jiang Liu <[email protected]>
	16	*/
	17
	18	/*
	19	* This driver manages I/O APICs added by hotplug after boot.
	20	* We try to claim all I/O APIC devices, but those present at boot were
	21	* registered when we parsed the ACPI MADT.
	22	*/
	23
b6aeab44	24	#define pr_fmt(fmt) "ACPI: IOAPIC: " fmt
c183619b JL	25
	26	#include <linux/slab.h>
	27	#include <linux/acpi.h>
	28	#include <linux/pci.h>
	29	#include <acpi/acpi.h>
	30
	31	struct acpi_pci_ioapic {
	32	acpi_handle root_handle;
	33	acpi_handle handle;
	34	u32 gsi_base;
	35	struct resource res;
	36	struct pci_dev *pdev;
	37	struct list_head list;
	38	};
	39
	40	static LIST_HEAD(ioapic_list);
	41	static DEFINE_MUTEX(ioapic_list_lock);
	42
	43	static acpi_status setup_res(struct acpi_resource acpi_res, void data)
	44	{
	45	struct resource *res = data;
	46	struct resource_win win;
	47
e3d5092b JR	48	/*
	49	* We might assign this to 'res' later, make sure all pointers are
	50	* cleared before the resource is added to the global list
	51	*/
	52	memset(&win, 0, sizeof(win));
	53
c183619b	54	res->flags = 0;
6ab7eba5	55	if (acpi_dev_filter_resource_type(acpi_res, IORESOURCE_MEM))
c183619b JL	56	return AE_OK;
	57
	58	if (!acpi_dev_resource_memory(acpi_res, res)) {
	59	if (acpi_dev_resource_address_space(acpi_res, &win) \|\|
	60	acpi_dev_resource_ext_address_space(acpi_res, &win))
	61	*res = win.res;
	62	}
	63	if ((res->flags & IORESOURCE_PREFETCH) \|\|
	64	(res->flags & IORESOURCE_DISABLED))
	65	res->flags = 0;
	66
	67	return AE_CTRL_TERMINATE;
	68	}
	69
	70	static bool acpi_is_ioapic(acpi_handle handle, char **type)
	71	{
	72	acpi_status status;
	73	struct acpi_device_info *info;
	74	char *hid = NULL;
	75	bool match = false;
	76
	77	if (!acpi_has_method(handle, "_GSB"))
	78	return false;
	79
	80	status = acpi_get_object_info(handle, &info);
	81	if (ACPI_SUCCESS(status)) {
	82	if (info->valid & ACPI_VALID_HID)
	83	hid = info->hardware_id.string;
	84	if (hid) {
	85	if (strcmp(hid, "ACPI0009") == 0) {
	86	*type = "IOxAPIC";
	87	match = true;
	88	} else if (strcmp(hid, "ACPI000A") == 0) {
	89	*type = "IOAPIC";
	90	match = true;
	91	}
	92	}
	93	kfree(info);
	94	}
	95
	96	return match;
	97	}
	98
	99	static acpi_status handle_ioapic_add(acpi_handle handle, u32 lvl,
	100	void context, void *rv)
	101	{
	102	acpi_status status;
	103	unsigned long long gsi_base;
	104	struct acpi_pci_ioapic *ioapic;
	105	struct pci_dev *dev = NULL;
162b83bd	106	struct resource res = NULL, pci_res = NULL, *crs_res;
c183619b JL	107	char *type = NULL;
	108
	109	if (!acpi_is_ioapic(handle, &type))
	110	return AE_OK;
	111
	112	mutex_lock(&ioapic_list_lock);
	113	list_for_each_entry(ioapic, &ioapic_list, list)
	114	if (ioapic->handle == handle) {
	115	mutex_unlock(&ioapic_list_lock);
	116	return AE_OK;
	117	}
	118
	119	status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsi_base);
	120	if (ACPI_FAILURE(status)) {
	121	acpi_handle_warn(handle, "failed to evaluate _GSB method\n");
	122	goto exit;
	123	}
	124
	125	ioapic = kzalloc(sizeof(*ioapic), GFP_KERNEL);
	126	if (!ioapic) {
	127	pr_err("cannot allocate memory for new IOAPIC\n");
	128	goto exit;
	129	} else {
	130	ioapic->root_handle = (acpi_handle)context;
	131	ioapic->handle = handle;
	132	ioapic->gsi_base = (u32)gsi_base;
	133	INIT_LIST_HEAD(&ioapic->list);
	134	}
	135
	136	if (acpi_ioapic_registered(handle, (u32)gsi_base))
	137	goto done;
	138
	139	dev = acpi_get_pci_dev(handle);
	140	if (dev && pci_resource_len(dev, 0)) {
	141	if (pci_enable_device(dev) < 0)
	142	goto exit_put;
	143	pci_set_master(dev);
	144	if (pci_request_region(dev, 0, type))
	145	goto exit_disable;
162b83bd	146	pci_res = &dev->resource[0];
c183619b JL	147	ioapic->pdev = dev;
	148	} else {
	149	pci_dev_put(dev);
	150	dev = NULL;
162b83bd	151	}
c183619b	152
162b83bd RW	153	crs_res = &ioapic->res;
162b83bd RW	154	acpi_walk_resources(handle, METHOD_NAME__CRS, setup_res, crs_res);
624cad9d RW	155	crs_res->name = type;
624cad9d RW	156	crs_res->flags \|= IORESOURCE_BUSY;
162b83bd RW	157	if (crs_res->flags == 0) {
	158	acpi_handle_warn(handle, "failed to get resource\n");
	159	goto exit_release;
624cad9d	160	} else if (insert_resource(&iomem_resource, crs_res)) {
162b83bd RW	161	acpi_handle_warn(handle, "failed to insert resource\n");
162b83bd RW	162	goto exit_release;
c183619b JL	163	}
c183619b JL	164
162b83bd RW	165	/* try pci resource first, then "_CRS" resource */
	166	res = pci_res;
	167	if (!res \|\| !res->flags)
	168	res = crs_res;
	169
c183619b JL	170	if (acpi_register_ioapic(handle, res->start, (u32)gsi_base)) {
	171	acpi_handle_warn(handle, "failed to register IOAPIC\n");
	172	goto exit_release;
	173	}
	174	done:
	175	list_add(&ioapic->list, &ioapic_list);
	176	mutex_unlock(&ioapic_list_lock);
	177
	178	if (dev)
	179	dev_info(&dev->dev, "%s at %pR, GSI %u\n",
	180	type, res, (u32)gsi_base);
	181	else
	182	acpi_handle_info(handle, "%s at %pR, GSI %u\n",
	183	type, res, (u32)gsi_base);
	184
	185	return AE_OK;
	186
	187	exit_release:
	188	if (dev)
	189	pci_release_region(dev, 0);
162b83bd RW	190	if (ioapic->res.flags && ioapic->res.parent)
162b83bd RW	191	release_resource(&ioapic->res);
c183619b JL	192	exit_disable:
	193	if (dev)
	194	pci_disable_device(dev);
	195	exit_put:
	196	pci_dev_put(dev);
c183619b JL	197	kfree(ioapic);
	198	exit:
	199	mutex_unlock(&ioapic_list_lock);
	200	(acpi_status )rv = AE_ERROR;
	201	return AE_OK;
	202	}
	203
fe7bd58f	204	int acpi_ioapic_add(acpi_handle root_handle)
c183619b JL	205	{
	206	acpi_status status, retval = AE_OK;
	207
fe7bd58f	208	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, root_handle,
c183619b	209	UINT_MAX, handle_ioapic_add, NULL,
fe7bd58f	210	root_handle, (void **)&retval);
c183619b JL	211
	212	return ACPI_SUCCESS(status) && ACPI_SUCCESS(retval) ? 0 : -ENODEV;
	213	}
	214
f2ae5da7	215	void pci_ioapic_remove(struct acpi_pci_root *root)
c183619b	216	{
c183619b JL	217	struct acpi_pci_ioapic ioapic, tmp;
	218
	219	mutex_lock(&ioapic_list_lock);
	220	list_for_each_entry_safe(ioapic, tmp, &ioapic_list, list) {
	221	if (root->device->handle != ioapic->root_handle)
	222	continue;
c183619b JL	223	if (ioapic->pdev) {
	224	pci_release_region(ioapic->pdev, 0);
	225	pci_disable_device(ioapic->pdev);
	226	pci_dev_put(ioapic->pdev);
c183619b	227	}
f2ae5da7 RW	228	}
	229	mutex_unlock(&ioapic_list_lock);
	230	}
	231
	232	int acpi_ioapic_remove(struct acpi_pci_root *root)
	233	{
	234	int retval = 0;
	235	struct acpi_pci_ioapic ioapic, tmp;
	236
	237	mutex_lock(&ioapic_list_lock);
	238	list_for_each_entry_safe(ioapic, tmp, &ioapic_list, list) {
	239	if (root->device->handle != ioapic->root_handle)
	240	continue;
	241	if (acpi_unregister_ioapic(ioapic->handle, ioapic->gsi_base))
	242	retval = -EBUSY;
162b83bd RW	243	if (ioapic->res.flags && ioapic->res.parent)
162b83bd RW	244	release_resource(&ioapic->res);
c183619b JL	245	list_del(&ioapic->list);
	246	kfree(ioapic);
	247	}
	248	mutex_unlock(&ioapic_list_lock);
	249
	250	return retval;
	251	}