[linux-2.6-block.git] / drivers / acpi / ioapic.c

// SPDX-License-Identifier: GPL-2.0-only
/*
 * IOAPIC/IOxAPIC/IOSAPIC driver
 *
 * Copyright (C) 2009 Fujitsu Limited.
 * (c) Copyright 2009 Hewlett-Packard Development Company, L.P.
 *
 * Copyright (C) 2014 Intel Corporation
 *
 * Based on original drivers/pci/ioapic.c
 *	Yinghai Lu <yinghai@kernel.org>
 *	Jiang Liu <jiang.liu@intel.com>
 */

/*
 * 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
d2912cb1	1	// SPDX-License-Identifier: GPL-2.0-only
c183619b JL	2	/*
	3	* IOAPIC/IOxAPIC/IOSAPIC driver
	4	*
	5	* Copyright (C) 2009 Fujitsu Limited.
	6	* (c) Copyright 2009 Hewlett-Packard Development Company, L.P.
	7	*
	8	* Copyright (C) 2014 Intel Corporation
	9	*
c183619b JL	10	* Based on original drivers/pci/ioapic.c
	11	* Yinghai Lu <yinghai@kernel.org>
	12	* Jiang Liu <jiang.liu@intel.com>
	13	*/
	14
	15	/*
	16	* This driver manages I/O APICs added by hotplug after boot.
	17	* We try to claim all I/O APIC devices, but those present at boot were
	18	* registered when we parsed the ACPI MADT.
	19	*/
	20
b6aeab44	21	#define pr_fmt(fmt) "ACPI: IOAPIC: " fmt
c183619b JL	22
	23	#include <linux/slab.h>
	24	#include <linux/acpi.h>
	25	#include <linux/pci.h>
	26	#include <acpi/acpi.h>
	27
	28	struct acpi_pci_ioapic {
	29	acpi_handle root_handle;
	30	acpi_handle handle;
	31	u32 gsi_base;
	32	struct resource res;
	33	struct pci_dev *pdev;
	34	struct list_head list;
	35	};
	36
	37	static LIST_HEAD(ioapic_list);
	38	static DEFINE_MUTEX(ioapic_list_lock);
	39
	40	static acpi_status setup_res(struct acpi_resource acpi_res, void data)
	41	{
	42	struct resource *res = data;
	43	struct resource_win win;
	44
e3d5092b JR	45	/*
	46	* We might assign this to 'res' later, make sure all pointers are
	47	* cleared before the resource is added to the global list
	48	*/
	49	memset(&win, 0, sizeof(win));
	50
c183619b	51	res->flags = 0;
6ab7eba5	52	if (acpi_dev_filter_resource_type(acpi_res, IORESOURCE_MEM))
c183619b JL	53	return AE_OK;
	54
	55	if (!acpi_dev_resource_memory(acpi_res, res)) {
	56	if (acpi_dev_resource_address_space(acpi_res, &win) \|\|
	57	acpi_dev_resource_ext_address_space(acpi_res, &win))
	58	*res = win.res;
	59	}
	60	if ((res->flags & IORESOURCE_PREFETCH) \|\|
	61	(res->flags & IORESOURCE_DISABLED))
	62	res->flags = 0;
	63
	64	return AE_CTRL_TERMINATE;
	65	}
	66
	67	static bool acpi_is_ioapic(acpi_handle handle, char **type)
	68	{
	69	acpi_status status;
	70	struct acpi_device_info *info;
	71	char *hid = NULL;
	72	bool match = false;
	73
	74	if (!acpi_has_method(handle, "_GSB"))
	75	return false;
	76
	77	status = acpi_get_object_info(handle, &info);
	78	if (ACPI_SUCCESS(status)) {
	79	if (info->valid & ACPI_VALID_HID)
	80	hid = info->hardware_id.string;
	81	if (hid) {
	82	if (strcmp(hid, "ACPI0009") == 0) {
	83	*type = "IOxAPIC";
	84	match = true;
	85	} else if (strcmp(hid, "ACPI000A") == 0) {
	86	*type = "IOAPIC";
	87	match = true;
	88	}
	89	}
	90	kfree(info);
	91	}
	92
	93	return match;
	94	}
	95
	96	static acpi_status handle_ioapic_add(acpi_handle handle, u32 lvl,
	97	void context, void *rv)
	98	{
	99	acpi_status status;
	100	unsigned long long gsi_base;
	101	struct acpi_pci_ioapic *ioapic;
	102	struct pci_dev *dev = NULL;
162b83bd	103	struct resource res = NULL, pci_res = NULL, *crs_res;
c183619b JL	104	char *type = NULL;
	105
	106	if (!acpi_is_ioapic(handle, &type))
	107	return AE_OK;
	108
	109	mutex_lock(&ioapic_list_lock);
	110	list_for_each_entry(ioapic, &ioapic_list, list)
	111	if (ioapic->handle == handle) {
	112	mutex_unlock(&ioapic_list_lock);
	113	return AE_OK;
	114	}
	115
	116	status = acpi_evaluate_integer(handle, "_GSB", NULL, &gsi_base);
	117	if (ACPI_FAILURE(status)) {
	118	acpi_handle_warn(handle, "failed to evaluate _GSB method\n");
	119	goto exit;
	120	}
	121
	122	ioapic = kzalloc(sizeof(*ioapic), GFP_KERNEL);
	123	if (!ioapic) {
	124	pr_err("cannot allocate memory for new IOAPIC\n");
	125	goto exit;
	126	} else {
	127	ioapic->root_handle = (acpi_handle)context;
	128	ioapic->handle = handle;
	129	ioapic->gsi_base = (u32)gsi_base;
	130	INIT_LIST_HEAD(&ioapic->list);
	131	}
	132
	133	if (acpi_ioapic_registered(handle, (u32)gsi_base))
	134	goto done;
	135
	136	dev = acpi_get_pci_dev(handle);
	137	if (dev && pci_resource_len(dev, 0)) {
	138	if (pci_enable_device(dev) < 0)
	139	goto exit_put;
	140	pci_set_master(dev);
	141	if (pci_request_region(dev, 0, type))
	142	goto exit_disable;
162b83bd	143	pci_res = &dev->resource[0];
c183619b JL	144	ioapic->pdev = dev;
	145	} else {
	146	pci_dev_put(dev);
	147	dev = NULL;
162b83bd	148	}
c183619b	149
162b83bd RW	150	crs_res = &ioapic->res;
162b83bd RW	151	acpi_walk_resources(handle, METHOD_NAME__CRS, setup_res, crs_res);
624cad9d RW	152	crs_res->name = type;
624cad9d RW	153	crs_res->flags \|= IORESOURCE_BUSY;
162b83bd RW	154	if (crs_res->flags == 0) {
	155	acpi_handle_warn(handle, "failed to get resource\n");
	156	goto exit_release;
624cad9d	157	} else if (insert_resource(&iomem_resource, crs_res)) {
162b83bd RW	158	acpi_handle_warn(handle, "failed to insert resource\n");
162b83bd RW	159	goto exit_release;
c183619b JL	160	}
c183619b JL	161
162b83bd RW	162	/* try pci resource first, then "_CRS" resource */
	163	res = pci_res;
	164	if (!res \|\| !res->flags)
	165	res = crs_res;
	166
c183619b JL	167	if (acpi_register_ioapic(handle, res->start, (u32)gsi_base)) {
	168	acpi_handle_warn(handle, "failed to register IOAPIC\n");
	169	goto exit_release;
	170	}
	171	done:
	172	list_add(&ioapic->list, &ioapic_list);
	173	mutex_unlock(&ioapic_list_lock);
	174
	175	if (dev)
	176	dev_info(&dev->dev, "%s at %pR, GSI %u\n",
	177	type, res, (u32)gsi_base);
	178	else
	179	acpi_handle_info(handle, "%s at %pR, GSI %u\n",
	180	type, res, (u32)gsi_base);
	181
	182	return AE_OK;
	183
	184	exit_release:
	185	if (dev)
	186	pci_release_region(dev, 0);
162b83bd RW	187	if (ioapic->res.flags && ioapic->res.parent)
162b83bd RW	188	release_resource(&ioapic->res);
c183619b JL	189	exit_disable:
	190	if (dev)
	191	pci_disable_device(dev);
	192	exit_put:
	193	pci_dev_put(dev);
c183619b JL	194	kfree(ioapic);
	195	exit:
	196	mutex_unlock(&ioapic_list_lock);
	197	(acpi_status )rv = AE_ERROR;
	198	return AE_OK;
	199	}
	200
fe7bd58f	201	int acpi_ioapic_add(acpi_handle root_handle)
c183619b JL	202	{
	203	acpi_status status, retval = AE_OK;
	204
fe7bd58f	205	status = acpi_walk_namespace(ACPI_TYPE_DEVICE, root_handle,
c183619b	206	UINT_MAX, handle_ioapic_add, NULL,
fe7bd58f	207	root_handle, (void **)&retval);
c183619b JL	208
	209	return ACPI_SUCCESS(status) && ACPI_SUCCESS(retval) ? 0 : -ENODEV;
	210	}
	211
f2ae5da7	212	void pci_ioapic_remove(struct acpi_pci_root *root)
c183619b	213	{
c183619b JL	214	struct acpi_pci_ioapic ioapic, tmp;
	215
	216	mutex_lock(&ioapic_list_lock);
	217	list_for_each_entry_safe(ioapic, tmp, &ioapic_list, list) {
	218	if (root->device->handle != ioapic->root_handle)
	219	continue;
c183619b JL	220	if (ioapic->pdev) {
	221	pci_release_region(ioapic->pdev, 0);
	222	pci_disable_device(ioapic->pdev);
	223	pci_dev_put(ioapic->pdev);
c183619b	224	}
f2ae5da7 RW	225	}
	226	mutex_unlock(&ioapic_list_lock);
	227	}
	228
	229	int acpi_ioapic_remove(struct acpi_pci_root *root)
	230	{
	231	int retval = 0;
	232	struct acpi_pci_ioapic ioapic, tmp;
	233
	234	mutex_lock(&ioapic_list_lock);
	235	list_for_each_entry_safe(ioapic, tmp, &ioapic_list, list) {
	236	if (root->device->handle != ioapic->root_handle)
	237	continue;
	238	if (acpi_unregister_ioapic(ioapic->handle, ioapic->gsi_base))
	239	retval = -EBUSY;
162b83bd RW	240	if (ioapic->res.flags && ioapic->res.parent)
162b83bd RW	241	release_resource(&ioapic->res);
c183619b JL	242	list_del(&ioapic->list);
	243	kfree(ioapic);
	244	}
	245	mutex_unlock(&ioapic_list_lock);
	246
	247	return retval;
	248	}