[mirror_ubuntu-bionic-kernel.git] / drivers / pci / hotplug / acpi_pcihp.c

/*
 * Common ACPI functions for hot plug platforms
 *
 * Copyright (C) 2006 Intel Corporation
 *
 * All rights reserved.
 *
 * 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, GOOD TITLE or
 * NON INFRINGEMENT.  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., 675 Mass Ave, Cambridge, MA 02139, USA.
 *
 * Send feedback to <kristen.c.accardi@intel.com>
 *
 */

#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/kernel.h>
#include <linux/types.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <linux/acpi.h>
#include <linux/pci-acpi.h>

#define MY_NAME	"acpi_pcihp"

#define dbg(fmt, arg...) do { if (debug_acpi) printk(KERN_DEBUG "%s: %s: " fmt , MY_NAME , __func__ , ## arg); } while (0)
#define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg)
#define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg)
#define warn(format, arg...) printk(KERN_WARNING "%s: " format , MY_NAME , ## arg)

#define	METHOD_NAME__SUN	"_SUN"
#define	METHOD_NAME_OSHP	"OSHP"

static int debug_acpi;

static acpi_status
decode_type0_hpx_record(union acpi_object *record, struct hotplug_params *hpx)
{
	int i;
	union acpi_object *fields = record->package.elements;
	u32 revision = fields[1].integer.value;

	switch (revision) {
	case 1:
		if (record->package.count != 6)
			return AE_ERROR;
		for (i = 2; i < 6; i++)
			if (fields[i].type != ACPI_TYPE_INTEGER)
				return AE_ERROR;
		hpx->t0 = &hpx->type0_data;
		hpx->t0->revision        = revision;
		hpx->t0->cache_line_size = fields[2].integer.value;
		hpx->t0->latency_timer   = fields[3].integer.value;
		hpx->t0->enable_serr     = fields[4].integer.value;
		hpx->t0->enable_perr     = fields[5].integer.value;
		break;
	default:
		printk(KERN_WARNING
		       "%s: Type 0 Revision %d record not supported\n",
		       __func__, revision);
		return AE_ERROR;
	}
	return AE_OK;
}

static acpi_status
decode_type1_hpx_record(union acpi_object *record, struct hotplug_params *hpx)
{
	int i;
	union acpi_object *fields = record->package.elements;
	u32 revision = fields[1].integer.value;

	switch (revision) {
	case 1:
		if (record->package.count != 5)
			return AE_ERROR;
		for (i = 2; i < 5; i++)
			if (fields[i].type != ACPI_TYPE_INTEGER)
				return AE_ERROR;
		hpx->t1 = &hpx->type1_data;
		hpx->t1->revision      = revision;
		hpx->t1->max_mem_read  = fields[2].integer.value;
		hpx->t1->avg_max_split = fields[3].integer.value;
		hpx->t1->tot_max_split = fields[4].integer.value;
		break;
	default:
		printk(KERN_WARNING
		       "%s: Type 1 Revision %d record not supported\n",
		       __func__, revision);
		return AE_ERROR;
	}
	return AE_OK;
}

static acpi_status
decode_type2_hpx_record(union acpi_object *record, struct hotplug_params *hpx)
{
	int i;
	union acpi_object *fields = record->package.elements;
	u32 revision = fields[1].integer.value;

	switch (revision) {
	case 1:
		if (record->package.count != 18)
			return AE_ERROR;
		for (i = 2; i < 18; i++)
			if (fields[i].type != ACPI_TYPE_INTEGER)
				return AE_ERROR;
		hpx->t2 = &hpx->type2_data;
		hpx->t2->revision      = revision;
		hpx->t2->unc_err_mask_and      = fields[2].integer.value;
		hpx->t2->unc_err_mask_or       = fields[3].integer.value;
		hpx->t2->unc_err_sever_and     = fields[4].integer.value;
		hpx->t2->unc_err_sever_or      = fields[5].integer.value;
		hpx->t2->cor_err_mask_and      = fields[6].integer.value;
		hpx->t2->cor_err_mask_or       = fields[7].integer.value;
		hpx->t2->adv_err_cap_and       = fields[8].integer.value;
		hpx->t2->adv_err_cap_or        = fields[9].integer.value;
		hpx->t2->pci_exp_devctl_and    = fields[10].integer.value;
		hpx->t2->pci_exp_devctl_or     = fields[11].integer.value;
		hpx->t2->pci_exp_lnkctl_and    = fields[12].integer.value;
		hpx->t2->pci_exp_lnkctl_or     = fields[13].integer.value;
		hpx->t2->sec_unc_err_sever_and = fields[14].integer.value;
		hpx->t2->sec_unc_err_sever_or  = fields[15].integer.value;
		hpx->t2->sec_unc_err_mask_and  = fields[16].integer.value;
		hpx->t2->sec_unc_err_mask_or   = fields[17].integer.value;
		break;
	default:
		printk(KERN_WARNING
		       "%s: Type 2 Revision %d record not supported\n",
		       __func__, revision);
		return AE_ERROR;
	}
	return AE_OK;
}

static acpi_status
acpi_run_hpx(acpi_handle handle, struct hotplug_params *hpx)
{
	acpi_status status;
	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
	union acpi_object *package, *record, *fields;
	u32 type;
	int i;

	/* Clear the return buffer with zeros */
	memset(hpx, 0, sizeof(struct hotplug_params));

	status = acpi_evaluate_object(handle, "_HPX", NULL, &buffer);
	if (ACPI_FAILURE(status))
		return status;

	package = (union acpi_object *)buffer.pointer;
	if (package->type != ACPI_TYPE_PACKAGE) {
		status = AE_ERROR;
		goto exit;
	}

	for (i = 0; i < package->package.count; i++) {
		record = &package->package.elements[i];
		if (record->type != ACPI_TYPE_PACKAGE) {
			status = AE_ERROR;
			goto exit;
		}

		fields = record->package.elements;
		if (fields[0].type != ACPI_TYPE_INTEGER ||
		    fields[1].type != ACPI_TYPE_INTEGER) {
			status = AE_ERROR;
			goto exit;
		}

		type = fields[0].integer.value;
		switch (type) {
		case 0:
			status = decode_type0_hpx_record(record, hpx);
			if (ACPI_FAILURE(status))
				goto exit;
			break;
		case 1:
			status = decode_type1_hpx_record(record, hpx);
			if (ACPI_FAILURE(status))
				goto exit;
			break;
		case 2:
			status = decode_type2_hpx_record(record, hpx);
			if (ACPI_FAILURE(status))
				goto exit;
			break;
		default:
			printk(KERN_ERR "%s: Type %d record not supported\n",
			       __func__, type);
			status = AE_ERROR;
			goto exit;
		}
	}
 exit:
	kfree(buffer.pointer);
	return status;
}

static acpi_status
acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp)
{
	acpi_status status;
	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	union acpi_object *package, *fields;
	int i;

	memset(hpp, 0, sizeof(struct hotplug_params));

	status = acpi_evaluate_object(handle, "_HPP", NULL, &buffer);
	if (ACPI_FAILURE(status))
		return status;

	package = (union acpi_object *) buffer.pointer;
	if (package->type != ACPI_TYPE_PACKAGE ||
	    package->package.count != 4) {
		status = AE_ERROR;
		goto exit;
	}

	fields = package->package.elements;
	for (i = 0; i < 4; i++) {
		if (fields[i].type != ACPI_TYPE_INTEGER) {
			status = AE_ERROR;
			goto exit;
		}
	}

	hpp->t0 = &hpp->type0_data;
	hpp->t0->revision        = 1;
	hpp->t0->cache_line_size = fields[0].integer.value;
	hpp->t0->latency_timer   = fields[1].integer.value;
	hpp->t0->enable_serr     = fields[2].integer.value;
	hpp->t0->enable_perr     = fields[3].integer.value;

exit:
	kfree(buffer.pointer);
	return status;
}


/* acpi_run_oshp - get control of hotplug from the firmware
 *
 * @handle - the handle of the hotplug controller.
 */
static acpi_status acpi_run_oshp(acpi_handle handle)
{
	acpi_status		status;
	struct acpi_buffer	string = { ACPI_ALLOCATE_BUFFER, NULL };

	acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);

	/* run OSHP */
	status = acpi_evaluate_object(handle, METHOD_NAME_OSHP, NULL, NULL);
	if (ACPI_FAILURE(status))
		if (status != AE_NOT_FOUND)
			printk(KERN_ERR "%s:%s OSHP fails=0x%x\n",
			       __func__, (char *)string.pointer, status);
		else
			dbg("%s:%s OSHP not found\n",
			    __func__, (char *)string.pointer);
	else
		pr_debug("%s:%s OSHP passes\n", __func__,
			(char *)string.pointer);

	kfree(string.pointer);
	return status;
}

/* pci_get_hp_params
 *
 * @dev - the pci_dev for which we want parameters
 * @hpp - allocated by the caller
 */
int pci_get_hp_params(struct pci_dev *dev, struct hotplug_params *hpp)
{
	acpi_status status;
	acpi_handle handle, phandle;
	struct pci_bus *pbus;

	handle = NULL;
	for (pbus = dev->bus; pbus; pbus = pbus->parent) {
		handle = acpi_pci_get_bridge_handle(pbus);
		if (handle)
			break;
	}

	/*
	 * _HPP settings apply to all child buses, until another _HPP is
	 * encountered. If we don't find an _HPP for the input pci dev,
	 * look for it in the parent device scope since that would apply to
	 * this pci dev.
	 */
	while (handle) {
		status = acpi_run_hpx(handle, hpp);
		if (ACPI_SUCCESS(status))
			return 0;
		status = acpi_run_hpp(handle, hpp);
		if (ACPI_SUCCESS(status))
			return 0;
		if (acpi_is_root_bridge(handle))
			break;
		status = acpi_get_parent(handle, &phandle);
		if (ACPI_FAILURE(status))
			break;
		handle = phandle;
	}
	return -ENODEV;
}
EXPORT_SYMBOL_GPL(pci_get_hp_params);

/**
 * acpi_get_hp_hw_control_from_firmware
 * @dev: the pci_dev of the bridge that has a hotplug controller
 * @flags: requested control bits for _OSC
 *
 * Attempt to take hotplug control from firmware.
 */
int acpi_get_hp_hw_control_from_firmware(struct pci_dev *pdev, u32 flags)
{
	acpi_status status;
	acpi_handle chandle, handle;
	struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL };

	flags &= (OSC_PCI_EXPRESS_NATIVE_HP_CONTROL |
		  OSC_SHPC_NATIVE_HP_CONTROL |
		  OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
	if (!flags) {
		err("Invalid flags %u specified!\n", flags);
		return -EINVAL;
	}

	/*
	 * Per PCI firmware specification, we should run the ACPI _OSC
	 * method to get control of hotplug hardware before using it. If
	 * an _OSC is missing, we look for an OSHP to do the same thing.
	 * To handle different BIOS behavior, we look for _OSC on a root
	 * bridge preferentially (according to PCI fw spec). Later for
	 * OSHP within the scope of the hotplug controller and its parents,
	 * upto the host bridge under which this controller exists.
	 */
	handle = acpi_find_root_bridge_handle(pdev);
	if (handle) {
		acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
		dbg("Trying to get hotplug control for %s\n",
				(char *)string.pointer);
		status = acpi_pci_osc_control_set(handle, flags);
		if (ACPI_SUCCESS(status))
			goto got_one;
		kfree(string.pointer);
		string = (struct acpi_buffer){ ACPI_ALLOCATE_BUFFER, NULL };
	}

	handle = DEVICE_ACPI_HANDLE(&pdev->dev);
	if (!handle) {
		/*
		 * This hotplug controller was not listed in the ACPI name
		 * space at all. Try to get acpi handle of parent pci bus.
		 */
		struct pci_bus *pbus;
		for (pbus = pdev->bus; pbus; pbus = pbus->parent) {
			handle = acpi_pci_get_bridge_handle(pbus);
			if (handle)
				break;
		}
	}

	while (handle) {
		acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
		dbg("Trying to get hotplug control for %s \n",
		    (char *)string.pointer);
		status = acpi_run_oshp(handle);
		if (ACPI_SUCCESS(status))
			goto got_one;
		if (acpi_is_root_bridge(handle))
			break;
		chandle = handle;
		status = acpi_get_parent(chandle, &handle);
		if (ACPI_FAILURE(status))
			break;
	}

	dbg("Cannot get control of hotplug hardware for pci %s\n",
	    pci_name(pdev));

	kfree(string.pointer);
	return -ENODEV;
got_one:
	dbg("Gained control for hotplug HW for pci %s (%s)\n",
	    pci_name(pdev), (char *)string.pointer);
	kfree(string.pointer);
	return 0;
}
EXPORT_SYMBOL(acpi_get_hp_hw_control_from_firmware);

static int is_ejectable(acpi_handle handle)
{
	acpi_status status;
	acpi_handle tmp;
	unsigned long long removable;
	status = acpi_get_handle(handle, "_ADR", &tmp);
	if (ACPI_FAILURE(status))
		return 0;
	status = acpi_get_handle(handle, "_EJ0", &tmp);
	if (ACPI_SUCCESS(status))
		return 1;
	status = acpi_evaluate_integer(handle, "_RMV", NULL, &removable);
	if (ACPI_SUCCESS(status) && removable)
		return 1;
	return 0;
}

/**
 * acpi_pcihp_check_ejectable - check if handle is ejectable ACPI PCI slot
 * @pbus: the PCI bus of the PCI slot corresponding to 'handle'
 * @handle: ACPI handle to check
 *
 * Return 1 if handle is ejectable PCI slot, 0 otherwise.
 */
int acpi_pci_check_ejectable(struct pci_bus *pbus, acpi_handle handle)
{
	acpi_handle bridge_handle, parent_handle;

	if (!(bridge_handle = acpi_pci_get_bridge_handle(pbus)))
		return 0;
	if ((ACPI_FAILURE(acpi_get_parent(handle, &parent_handle))))
		return 0;
	if (bridge_handle != parent_handle)
		return 0;
	return is_ejectable(handle);
}
EXPORT_SYMBOL_GPL(acpi_pci_check_ejectable);

static acpi_status
check_hotplug(acpi_handle handle, u32 lvl, void *context, void **rv)
{
	int *found = (int *)context;
	if (is_ejectable(handle)) {
		*found = 1;
		return AE_CTRL_TERMINATE;
	}
	return AE_OK;
}

/**
 * acpi_pci_detect_ejectable - check if the PCI bus has ejectable slots
 * @handle - handle of the PCI bus to scan
 *
 * Returns 1 if the PCI bus has ACPI based ejectable slots, 0 otherwise.
 */
int acpi_pci_detect_ejectable(acpi_handle handle)
{
	int found = 0;

	if (!handle)
		return found;

	acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
			    check_hotplug, (void *)&found, NULL);
	return found;
}
EXPORT_SYMBOL_GPL(acpi_pci_detect_ejectable);

module_param(debug_acpi, bool, 0644);
MODULE_PARM_DESC(debug_acpi, "Debugging mode for ACPI enabled or not");
Commit	Line	Data
1da177e4	1	/*
783c49fc	2	* Common ACPI functions for hot plug platforms
1da177e4	3	*
783c49fc	4	* Copyright (C) 2006 Intel Corporation
1da177e4 LT	5	*
	6	* All rights reserved.
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or (at
	11	* your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful, but
	14	* WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
	16	* NON INFRINGEMENT. See the GNU General Public License for more
	17	* details.
	18	*
	19	* You should have received a copy of the GNU General Public License
	20	* along with this program; if not, write to the Free Software
	21	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	22	*
8cf4c195	23	* Send feedback to <kristen.c.accardi@intel.com>
1da177e4 LT	24	*
	25	*/
	26
1da177e4	27	#include <linux/module.h>
aad20cab	28	#include <linux/moduleparam.h>
1da177e4 LT	29	#include <linux/kernel.h>
	30	#include <linux/types.h>
	31	#include <linux/pci.h>
7a54f25c	32	#include <linux/pci_hotplug.h>
9f5404d8	33	#include <linux/acpi.h>
ac9c052d	34	#include <linux/pci-acpi.h>
1da177e4	35
aad20cab KK	36	#define MY_NAME "acpi_pcihp"
aad20cab KK	37
66bef8c0	38	#define dbg(fmt, arg...) do { if (debug_acpi) printk(KERN_DEBUG "%s: %s: " fmt , MY_NAME , __func__ , ## arg); } while (0)
aad20cab KK	39	#define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg)
	40	#define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg)
	41	#define warn(format, arg...) printk(KERN_WARNING "%s: " format , MY_NAME , ## arg)
	42
1da177e4	43	#define METHOD_NAME__SUN "_SUN"
1da177e4 LT	44	#define METHOD_NAME_OSHP "OSHP"
1da177e4 LT	45
aad20cab KK	46	static int debug_acpi;
aad20cab KK	47
e22b7350 KK	48	static acpi_status
	49	decode_type0_hpx_record(union acpi_object record, struct hotplug_params hpx)
	50	{
	51	int i;
	52	union acpi_object *fields = record->package.elements;
	53	u32 revision = fields[1].integer.value;
	54
	55	switch (revision) {
	56	case 1:
	57	if (record->package.count != 6)
	58	return AE_ERROR;
	59	for (i = 2; i < 6; i++)
	60	if (fields[i].type != ACPI_TYPE_INTEGER)
	61	return AE_ERROR;
	62	hpx->t0 = &hpx->type0_data;
	63	hpx->t0->revision = revision;
	64	hpx->t0->cache_line_size = fields[2].integer.value;
	65	hpx->t0->latency_timer = fields[3].integer.value;
	66	hpx->t0->enable_serr = fields[4].integer.value;
	67	hpx->t0->enable_perr = fields[5].integer.value;
	68	break;
	69	default:
	70	printk(KERN_WARNING
	71	"%s: Type 0 Revision %d record not supported\n",
66bef8c0	72	__func__, revision);
e22b7350 KK	73	return AE_ERROR;
	74	}
	75	return AE_OK;
	76	}
	77
	78	static acpi_status
	79	decode_type1_hpx_record(union acpi_object record, struct hotplug_params hpx)
	80	{
	81	int i;
	82	union acpi_object *fields = record->package.elements;
	83	u32 revision = fields[1].integer.value;
	84
	85	switch (revision) {
	86	case 1:
	87	if (record->package.count != 5)
	88	return AE_ERROR;
	89	for (i = 2; i < 5; i++)
	90	if (fields[i].type != ACPI_TYPE_INTEGER)
	91	return AE_ERROR;
	92	hpx->t1 = &hpx->type1_data;
	93	hpx->t1->revision = revision;
	94	hpx->t1->max_mem_read = fields[2].integer.value;
	95	hpx->t1->avg_max_split = fields[3].integer.value;
	96	hpx->t1->tot_max_split = fields[4].integer.value;
	97	break;
	98	default:
	99	printk(KERN_WARNING
	100	"%s: Type 1 Revision %d record not supported\n",
66bef8c0	101	__func__, revision);
e22b7350 KK	102	return AE_ERROR;
	103	}
	104	return AE_OK;
	105	}
	106
	107	static acpi_status
	108	decode_type2_hpx_record(union acpi_object record, struct hotplug_params hpx)
	109	{
	110	int i;
	111	union acpi_object *fields = record->package.elements;
	112	u32 revision = fields[1].integer.value;
	113
	114	switch (revision) {
	115	case 1:
	116	if (record->package.count != 18)
	117	return AE_ERROR;
	118	for (i = 2; i < 18; i++)
	119	if (fields[i].type != ACPI_TYPE_INTEGER)
	120	return AE_ERROR;
	121	hpx->t2 = &hpx->type2_data;
	122	hpx->t2->revision = revision;
	123	hpx->t2->unc_err_mask_and = fields[2].integer.value;
	124	hpx->t2->unc_err_mask_or = fields[3].integer.value;
	125	hpx->t2->unc_err_sever_and = fields[4].integer.value;
	126	hpx->t2->unc_err_sever_or = fields[5].integer.value;
	127	hpx->t2->cor_err_mask_and = fields[6].integer.value;
	128	hpx->t2->cor_err_mask_or = fields[7].integer.value;
	129	hpx->t2->adv_err_cap_and = fields[8].integer.value;
	130	hpx->t2->adv_err_cap_or = fields[9].integer.value;
	131	hpx->t2->pci_exp_devctl_and = fields[10].integer.value;
	132	hpx->t2->pci_exp_devctl_or = fields[11].integer.value;
	133	hpx->t2->pci_exp_lnkctl_and = fields[12].integer.value;
	134	hpx->t2->pci_exp_lnkctl_or = fields[13].integer.value;
	135	hpx->t2->sec_unc_err_sever_and = fields[14].integer.value;
	136	hpx->t2->sec_unc_err_sever_or = fields[15].integer.value;
	137	hpx->t2->sec_unc_err_mask_and = fields[16].integer.value;
	138	hpx->t2->sec_unc_err_mask_or = fields[17].integer.value;
	139	break;
	140	default:
	141	printk(KERN_WARNING
	142	"%s: Type 2 Revision %d record not supported\n",
66bef8c0	143	__func__, revision);
e22b7350 KK	144	return AE_ERROR;
	145	}
	146	return AE_OK;
	147	}
	148
	149	static acpi_status
	150	acpi_run_hpx(acpi_handle handle, struct hotplug_params *hpx)
	151	{
	152	acpi_status status;
	153	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
	154	union acpi_object package, record, *fields;
	155	u32 type;
	156	int i;
	157
	158	/* Clear the return buffer with zeros */
	159	memset(hpx, 0, sizeof(struct hotplug_params));
	160
	161	status = acpi_evaluate_object(handle, "_HPX", NULL, &buffer);
	162	if (ACPI_FAILURE(status))
	163	return status;
	164
	165	package = (union acpi_object *)buffer.pointer;
	166	if (package->type != ACPI_TYPE_PACKAGE) {
	167	status = AE_ERROR;
	168	goto exit;
	169	}
	170
	171	for (i = 0; i < package->package.count; i++) {
	172	record = &package->package.elements[i];
	173	if (record->type != ACPI_TYPE_PACKAGE) {
	174	status = AE_ERROR;
	175	goto exit;
	176	}
	177
	178	fields = record->package.elements;
	179	if (fields[0].type != ACPI_TYPE_INTEGER \|\|
	180	fields[1].type != ACPI_TYPE_INTEGER) {
	181	status = AE_ERROR;
	182	goto exit;
	183	}
	184
	185	type = fields[0].integer.value;
	186	switch (type) {
	187	case 0:
	188	status = decode_type0_hpx_record(record, hpx);
	189	if (ACPI_FAILURE(status))
	190	goto exit;
	191	break;
	192	case 1:
	193	status = decode_type1_hpx_record(record, hpx);
	194	if (ACPI_FAILURE(status))
	195	goto exit;
	196	break;
	197	case 2:
	198	status = decode_type2_hpx_record(record, hpx);
	199	if (ACPI_FAILURE(status))
	200	goto exit;
	201	break;
	202	default:
	203	printk(KERN_ERR "%s: Type %d record not supported\n",
66bef8c0	204	__func__, type);
e22b7350 KK	205	status = AE_ERROR;
	206	goto exit;
	207	}
	208	}
	209	exit:
	210	kfree(buffer.pointer);
	211	return status;
	212	}
1da177e4	213
a8a2be94 RS	214	static acpi_status
a8a2be94 RS	215	acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp)
1da177e4	216	{
5e3573db BH	217	acpi_status status;
	218	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	219	union acpi_object package, fields;
	220	int i;
b2e6e3ba	221
e22b7350 KK	222	memset(hpp, 0, sizeof(struct hotplug_params));
e22b7350 KK	223
5e3573db BH	224	status = acpi_evaluate_object(handle, "_HPP", NULL, &buffer);
	225	if (ACPI_FAILURE(status))
	226	return status;
1da177e4	227
5e3573db BH	228	package = (union acpi_object *) buffer.pointer;
	229	if (package->type != ACPI_TYPE_PACKAGE \|\|
	230	package->package.count != 4) {
a8a2be94	231	status = AE_ERROR;
5e3573db	232	goto exit;
1da177e4 LT	233	}
1da177e4 LT	234
5e3573db BH	235	fields = package->package.elements;
	236	for (i = 0; i < 4; i++) {
	237	if (fields[i].type != ACPI_TYPE_INTEGER) {
a8a2be94	238	status = AE_ERROR;
5e3573db	239	goto exit;
1da177e4 LT	240	}
	241	}
	242
e22b7350	243	hpp->t0 = &hpp->type0_data;
5e3573db BH	244	hpp->t0->revision = 1;
	245	hpp->t0->cache_line_size = fields[0].integer.value;
	246	hpp->t0->latency_timer = fields[1].integer.value;
	247	hpp->t0->enable_serr = fields[2].integer.value;
	248	hpp->t0->enable_perr = fields[3].integer.value;
1da177e4	249
5e3573db BH	250	exit:
5e3573db BH	251	kfree(buffer.pointer);
a8a2be94	252	return status;
1da177e4 LT	253	}
1da177e4 LT	254
783c49fc KA	255
	256
	257	/* acpi_run_oshp - get control of hotplug from the firmware
	258	*
	259	* @handle - the handle of the hotplug controller.
	260	*/
ac9c052d	261	static acpi_status acpi_run_oshp(acpi_handle handle)
1da177e4 LT	262	{
1da177e4 LT	263	acpi_status status;
b2e6e3ba MT	264	struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL };
	265
	266	acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
1da177e4 LT	267
1da177e4 LT	268	/* run OSHP */
a8a2be94	269	status = acpi_evaluate_object(handle, METHOD_NAME_OSHP, NULL, NULL);
783c49fc	270	if (ACPI_FAILURE(status))
aad20cab KK	271	if (status != AE_NOT_FOUND)
aad20cab KK	272	printk(KERN_ERR "%s:%s OSHP fails=0x%x\n",
66bef8c0	273	__func__, (char *)string.pointer, status);
aad20cab KK	274	else
aad20cab KK	275	dbg("%s:%s OSHP not found\n",
66bef8c0	276	__func__, (char *)string.pointer);
783c49fc	277	else
66bef8c0	278	pr_debug("%s:%s OSHP passes\n", __func__,
b2e6e3ba MT	279	(char *)string.pointer);
b2e6e3ba MT	280
81b26bca	281	kfree(string.pointer);
783c49fc KA	282	return status;
783c49fc KA	283	}
783c49fc	284
e81995bb	285	/* pci_get_hp_params
783c49fc	286	*
6a29172b	287	* @dev - the pci_dev for which we want parameters
783c49fc KA	288	* @hpp - allocated by the caller
783c49fc KA	289	*/
e81995bb	290	int pci_get_hp_params(struct pci_dev dev, struct hotplug_params hpp)
783c49fc	291	{
6a29172b	292	acpi_status status;
7430e34c	293	acpi_handle handle, phandle;
267efd7e KK	294	struct pci_bus *pbus;
	295
	296	handle = NULL;
6a29172b	297	for (pbus = dev->bus; pbus; pbus = pbus->parent) {
267efd7e KK	298	handle = acpi_pci_get_bridge_handle(pbus);
267efd7e KK	299	if (handle)
7430e34c	300	break;
267efd7e	301	}
783c49fc KA	302
	303	/*
	304	* _HPP settings apply to all child buses, until another _HPP is
	305	* encountered. If we don't find an _HPP for the input pci dev,
	306	* look for it in the parent device scope since that would apply to
e81995bb	307	* this pci dev.
783c49fc	308	*/
7430e34c	309	while (handle) {
e22b7350 KK	310	status = acpi_run_hpx(handle, hpp);
e22b7350 KK	311	if (ACPI_SUCCESS(status))
6a29172b	312	return 0;
783c49fc	313	status = acpi_run_hpp(handle, hpp);
7430e34c	314	if (ACPI_SUCCESS(status))
6a29172b	315	return 0;
27558203	316	if (acpi_is_root_bridge(handle))
7430e34c KK	317	break;
	318	status = acpi_get_parent(handle, &phandle);
	319	if (ACPI_FAILURE(status))
783c49fc	320	break;
7430e34c	321	handle = phandle;
1da177e4	322	}
6a29172b	323	return -ENODEV;
1da177e4	324	}
e81995bb	325	EXPORT_SYMBOL_GPL(pci_get_hp_params);
783c49fc	326
ac9c052d KK	327	/**
	328	* acpi_get_hp_hw_control_from_firmware
	329	* @dev: the pci_dev of the bridge that has a hotplug controller
	330	* @flags: requested control bits for _OSC
	331	*
	332	* Attempt to take hotplug control from firmware.
	333	*/
d391f00f	334	int acpi_get_hp_hw_control_from_firmware(struct pci_dev *pdev, u32 flags)
ac9c052d KK	335	{
ac9c052d KK	336	acpi_status status;
e0d94bee	337	acpi_handle chandle, handle;
ac9c052d KK	338	struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL };
	339
	340	flags &= (OSC_PCI_EXPRESS_NATIVE_HP_CONTROL \|
	341	OSC_SHPC_NATIVE_HP_CONTROL \|
	342	OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
	343	if (!flags) {
	344	err("Invalid flags %u specified!\n", flags);
	345	return -EINVAL;
	346	}
	347
	348	/*
	349	* Per PCI firmware specification, we should run the ACPI _OSC
	350	* method to get control of hotplug hardware before using it. If
	351	* an _OSC is missing, we look for an OSHP to do the same thing.
e0d94bee JS	352	* To handle different BIOS behavior, we look for _OSC on a root
	353	* bridge preferentially (according to PCI fw spec). Later for
	354	* OSHP within the scope of the hotplug controller and its parents,
ac9c052d KK	355	* upto the host bridge under which this controller exists.
ac9c052d KK	356	*/
056c58e8	357	handle = acpi_find_root_bridge_handle(pdev);
e0d94bee JS	358	if (handle) {
	359	acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
	360	dbg("Trying to get hotplug control for %s\n",
	361	(char *)string.pointer);
9f5404d8	362	status = acpi_pci_osc_control_set(handle, flags);
e0d94bee JS	363	if (ACPI_SUCCESS(status))
	364	goto got_one;
	365	kfree(string.pointer);
	366	string = (struct acpi_buffer){ ACPI_ALLOCATE_BUFFER, NULL };
	367	}
	368
d391f00f KK	369	handle = DEVICE_ACPI_HANDLE(&pdev->dev);
d391f00f KK	370	if (!handle) {
ac9c052d KK	371	/*
	372	* This hotplug controller was not listed in the ACPI name
	373	* space at all. Try to get acpi handle of parent pci bus.
	374	*/
d391f00f KK	375	struct pci_bus *pbus;
	376	for (pbus = pdev->bus; pbus; pbus = pbus->parent) {
	377	handle = acpi_pci_get_bridge_handle(pbus);
	378	if (handle)
	379	break;
	380	}
ac9c052d KK	381	}
	382
	383	while (handle) {
	384	acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
	385	dbg("Trying to get hotplug control for %s \n",
	386	(char *)string.pointer);
e0d94bee JS	387	status = acpi_run_oshp(handle);
	388	if (ACPI_SUCCESS(status))
	389	goto got_one;
27558203	390	if (acpi_is_root_bridge(handle))
ac9c052d KK	391	break;
	392	chandle = handle;
	393	status = acpi_get_parent(chandle, &handle);
	394	if (ACPI_FAILURE(status))
	395	break;
	396	}
	397
	398	dbg("Cannot get control of hotplug hardware for pci %s\n",
d391f00f	399	pci_name(pdev));
ac9c052d KK	400
	401	kfree(string.pointer);
	402	return -ENODEV;
e0d94bee	403	got_one:
d391f00f KK	404	dbg("Gained control for hotplug HW for pci %s (%s)\n",
d391f00f KK	405	pci_name(pdev), (char *)string.pointer);
e0d94bee JS	406	kfree(string.pointer);
e0d94bee JS	407	return 0;
ac9c052d KK	408	}
ac9c052d KK	409	EXPORT_SYMBOL(acpi_get_hp_hw_control_from_firmware);
1da177e4	410
e8c331e9 KK	411	static int is_ejectable(acpi_handle handle)
	412	{
	413	acpi_status status;
	414	acpi_handle tmp;
	415	unsigned long long removable;
	416	status = acpi_get_handle(handle, "_ADR", &tmp);
	417	if (ACPI_FAILURE(status))
	418	return 0;
	419	status = acpi_get_handle(handle, "_EJ0", &tmp);
	420	if (ACPI_SUCCESS(status))
	421	return 1;
	422	status = acpi_evaluate_integer(handle, "_RMV", NULL, &removable);
	423	if (ACPI_SUCCESS(status) && removable)
	424	return 1;
	425	return 0;
	426	}
	427
	428	/**
	429	* acpi_pcihp_check_ejectable - check if handle is ejectable ACPI PCI slot
	430	* @pbus: the PCI bus of the PCI slot corresponding to 'handle'
	431	* @handle: ACPI handle to check
	432	*
	433	* Return 1 if handle is ejectable PCI slot, 0 otherwise.
	434	*/
	435	int acpi_pci_check_ejectable(struct pci_bus *pbus, acpi_handle handle)
	436	{
	437	acpi_handle bridge_handle, parent_handle;
	438
	439	if (!(bridge_handle = acpi_pci_get_bridge_handle(pbus)))
	440	return 0;
	441	if ((ACPI_FAILURE(acpi_get_parent(handle, &parent_handle))))
	442	return 0;
	443	if (bridge_handle != parent_handle)
	444	return 0;
	445	return is_ejectable(handle);
	446	}
	447	EXPORT_SYMBOL_GPL(acpi_pci_check_ejectable);
	448
	449	static acpi_status
	450	check_hotplug(acpi_handle handle, u32 lvl, void context, void *rv)
	451	{
	452	int found = (int )context;
	453	if (is_ejectable(handle)) {
	454	*found = 1;
	455	return AE_CTRL_TERMINATE;
	456	}
	457	return AE_OK;
	458	}
	459
	460	/**
	461	* acpi_pci_detect_ejectable - check if the PCI bus has ejectable slots
7f538669	462	* @handle - handle of the PCI bus to scan
e8c331e9 KK	463	*
	464	* Returns 1 if the PCI bus has ACPI based ejectable slots, 0 otherwise.
	465	*/
7f538669	466	int acpi_pci_detect_ejectable(acpi_handle handle)
e8c331e9	467	{
e8c331e9 KK	468	int found = 0;
e8c331e9 KK	469
7f538669 AC	470	if (!handle)
	471	return found;
	472
	473	acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
e8c331e9 KK	474	check_hotplug, (void *)&found, NULL);
	475	return found;
	476	}
	477	EXPORT_SYMBOL_GPL(acpi_pci_detect_ejectable);
	478
aad20cab KK	479	module_param(debug_acpi, bool, 0644);
aad20cab KK	480	MODULE_PARM_DESC(debug_acpi, "Debugging mode for ACPI enabled or not");