[net-next-2.6.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>
#include <linux/slab.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;
		if (status == AE_SUPPORT)
			goto no_control;
		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;
	}
no_control:
	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, NULL, (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>
5a0e3ad6	35	#include <linux/slab.h>
1da177e4	36
aad20cab KK	37	#define MY_NAME "acpi_pcihp"
aad20cab KK	38
66bef8c0	39	#define dbg(fmt, arg...) do { if (debug_acpi) printk(KERN_DEBUG "%s: %s: " fmt , MY_NAME , __func__ , ## arg); } while (0)
aad20cab KK	40	#define err(format, arg...) printk(KERN_ERR "%s: " format , MY_NAME , ## arg)
	41	#define info(format, arg...) printk(KERN_INFO "%s: " format , MY_NAME , ## arg)
	42	#define warn(format, arg...) printk(KERN_WARNING "%s: " format , MY_NAME , ## arg)
	43
1da177e4	44	#define METHOD_NAME__SUN "_SUN"
1da177e4 LT	45	#define METHOD_NAME_OSHP "OSHP"
1da177e4 LT	46
aad20cab KK	47	static int debug_acpi;
aad20cab KK	48
e22b7350 KK	49	static acpi_status
	50	decode_type0_hpx_record(union acpi_object record, struct hotplug_params hpx)
	51	{
	52	int i;
	53	union acpi_object *fields = record->package.elements;
	54	u32 revision = fields[1].integer.value;
	55
	56	switch (revision) {
	57	case 1:
	58	if (record->package.count != 6)
	59	return AE_ERROR;
	60	for (i = 2; i < 6; i++)
	61	if (fields[i].type != ACPI_TYPE_INTEGER)
	62	return AE_ERROR;
	63	hpx->t0 = &hpx->type0_data;
	64	hpx->t0->revision = revision;
	65	hpx->t0->cache_line_size = fields[2].integer.value;
	66	hpx->t0->latency_timer = fields[3].integer.value;
	67	hpx->t0->enable_serr = fields[4].integer.value;
	68	hpx->t0->enable_perr = fields[5].integer.value;
	69	break;
	70	default:
	71	printk(KERN_WARNING
	72	"%s: Type 0 Revision %d record not supported\n",
66bef8c0	73	__func__, revision);
e22b7350 KK	74	return AE_ERROR;
	75	}
	76	return AE_OK;
	77	}
	78
	79	static acpi_status
	80	decode_type1_hpx_record(union acpi_object record, struct hotplug_params hpx)
	81	{
	82	int i;
	83	union acpi_object *fields = record->package.elements;
	84	u32 revision = fields[1].integer.value;
	85
	86	switch (revision) {
	87	case 1:
	88	if (record->package.count != 5)
	89	return AE_ERROR;
	90	for (i = 2; i < 5; i++)
	91	if (fields[i].type != ACPI_TYPE_INTEGER)
	92	return AE_ERROR;
	93	hpx->t1 = &hpx->type1_data;
	94	hpx->t1->revision = revision;
	95	hpx->t1->max_mem_read = fields[2].integer.value;
	96	hpx->t1->avg_max_split = fields[3].integer.value;
	97	hpx->t1->tot_max_split = fields[4].integer.value;
	98	break;
	99	default:
	100	printk(KERN_WARNING
	101	"%s: Type 1 Revision %d record not supported\n",
66bef8c0	102	__func__, revision);
e22b7350 KK	103	return AE_ERROR;
	104	}
	105	return AE_OK;
	106	}
	107
	108	static acpi_status
	109	decode_type2_hpx_record(union acpi_object record, struct hotplug_params hpx)
	110	{
	111	int i;
	112	union acpi_object *fields = record->package.elements;
	113	u32 revision = fields[1].integer.value;
	114
	115	switch (revision) {
	116	case 1:
	117	if (record->package.count != 18)
	118	return AE_ERROR;
	119	for (i = 2; i < 18; i++)
	120	if (fields[i].type != ACPI_TYPE_INTEGER)
	121	return AE_ERROR;
	122	hpx->t2 = &hpx->type2_data;
	123	hpx->t2->revision = revision;
	124	hpx->t2->unc_err_mask_and = fields[2].integer.value;
	125	hpx->t2->unc_err_mask_or = fields[3].integer.value;
	126	hpx->t2->unc_err_sever_and = fields[4].integer.value;
	127	hpx->t2->unc_err_sever_or = fields[5].integer.value;
	128	hpx->t2->cor_err_mask_and = fields[6].integer.value;
	129	hpx->t2->cor_err_mask_or = fields[7].integer.value;
	130	hpx->t2->adv_err_cap_and = fields[8].integer.value;
	131	hpx->t2->adv_err_cap_or = fields[9].integer.value;
	132	hpx->t2->pci_exp_devctl_and = fields[10].integer.value;
	133	hpx->t2->pci_exp_devctl_or = fields[11].integer.value;
	134	hpx->t2->pci_exp_lnkctl_and = fields[12].integer.value;
	135	hpx->t2->pci_exp_lnkctl_or = fields[13].integer.value;
	136	hpx->t2->sec_unc_err_sever_and = fields[14].integer.value;
	137	hpx->t2->sec_unc_err_sever_or = fields[15].integer.value;
	138	hpx->t2->sec_unc_err_mask_and = fields[16].integer.value;
	139	hpx->t2->sec_unc_err_mask_or = fields[17].integer.value;
	140	break;
	141	default:
	142	printk(KERN_WARNING
	143	"%s: Type 2 Revision %d record not supported\n",
66bef8c0	144	__func__, revision);
e22b7350 KK	145	return AE_ERROR;
	146	}
	147	return AE_OK;
	148	}
	149
	150	static acpi_status
	151	acpi_run_hpx(acpi_handle handle, struct hotplug_params *hpx)
	152	{
	153	acpi_status status;
	154	struct acpi_buffer buffer = {ACPI_ALLOCATE_BUFFER, NULL};
	155	union acpi_object package, record, *fields;
	156	u32 type;
	157	int i;
	158
	159	/* Clear the return buffer with zeros */
	160	memset(hpx, 0, sizeof(struct hotplug_params));
	161
	162	status = acpi_evaluate_object(handle, "_HPX", NULL, &buffer);
	163	if (ACPI_FAILURE(status))
	164	return status;
	165
	166	package = (union acpi_object *)buffer.pointer;
	167	if (package->type != ACPI_TYPE_PACKAGE) {
	168	status = AE_ERROR;
	169	goto exit;
	170	}
	171
	172	for (i = 0; i < package->package.count; i++) {
	173	record = &package->package.elements[i];
	174	if (record->type != ACPI_TYPE_PACKAGE) {
	175	status = AE_ERROR;
	176	goto exit;
	177	}
	178
	179	fields = record->package.elements;
	180	if (fields[0].type != ACPI_TYPE_INTEGER \|\|
	181	fields[1].type != ACPI_TYPE_INTEGER) {
	182	status = AE_ERROR;
	183	goto exit;
	184	}
	185
	186	type = fields[0].integer.value;
	187	switch (type) {
	188	case 0:
	189	status = decode_type0_hpx_record(record, hpx);
	190	if (ACPI_FAILURE(status))
	191	goto exit;
	192	break;
	193	case 1:
	194	status = decode_type1_hpx_record(record, hpx);
	195	if (ACPI_FAILURE(status))
	196	goto exit;
	197	break;
	198	case 2:
	199	status = decode_type2_hpx_record(record, hpx);
	200	if (ACPI_FAILURE(status))
	201	goto exit;
	202	break;
	203	default:
	204	printk(KERN_ERR "%s: Type %d record not supported\n",
66bef8c0	205	__func__, type);
e22b7350 KK	206	status = AE_ERROR;
	207	goto exit;
	208	}
	209	}
	210	exit:
	211	kfree(buffer.pointer);
	212	return status;
	213	}
1da177e4	214
a8a2be94 RS	215	static acpi_status
a8a2be94 RS	216	acpi_run_hpp(acpi_handle handle, struct hotplug_params *hpp)
1da177e4	217	{
5e3573db BH	218	acpi_status status;
	219	struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
	220	union acpi_object package, fields;
	221	int i;
b2e6e3ba	222
e22b7350 KK	223	memset(hpp, 0, sizeof(struct hotplug_params));
e22b7350 KK	224
5e3573db BH	225	status = acpi_evaluate_object(handle, "_HPP", NULL, &buffer);
	226	if (ACPI_FAILURE(status))
	227	return status;
1da177e4	228
5e3573db BH	229	package = (union acpi_object *) buffer.pointer;
	230	if (package->type != ACPI_TYPE_PACKAGE \|\|
	231	package->package.count != 4) {
a8a2be94	232	status = AE_ERROR;
5e3573db	233	goto exit;
1da177e4 LT	234	}
1da177e4 LT	235
5e3573db BH	236	fields = package->package.elements;
	237	for (i = 0; i < 4; i++) {
	238	if (fields[i].type != ACPI_TYPE_INTEGER) {
a8a2be94	239	status = AE_ERROR;
5e3573db	240	goto exit;
1da177e4 LT	241	}
	242	}
	243
e22b7350	244	hpp->t0 = &hpp->type0_data;
5e3573db BH	245	hpp->t0->revision = 1;
	246	hpp->t0->cache_line_size = fields[0].integer.value;
	247	hpp->t0->latency_timer = fields[1].integer.value;
	248	hpp->t0->enable_serr = fields[2].integer.value;
	249	hpp->t0->enable_perr = fields[3].integer.value;
1da177e4	250
5e3573db BH	251	exit:
5e3573db BH	252	kfree(buffer.pointer);
a8a2be94	253	return status;
1da177e4 LT	254	}
1da177e4 LT	255
783c49fc KA	256
	257
	258	/* acpi_run_oshp - get control of hotplug from the firmware
	259	*
	260	* @handle - the handle of the hotplug controller.
	261	*/
ac9c052d	262	static acpi_status acpi_run_oshp(acpi_handle handle)
1da177e4 LT	263	{
1da177e4 LT	264	acpi_status status;
b2e6e3ba MT	265	struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL };
	266
	267	acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
1da177e4 LT	268
1da177e4 LT	269	/* run OSHP */
a8a2be94	270	status = acpi_evaluate_object(handle, METHOD_NAME_OSHP, NULL, NULL);
783c49fc	271	if (ACPI_FAILURE(status))
aad20cab KK	272	if (status != AE_NOT_FOUND)
aad20cab KK	273	printk(KERN_ERR "%s:%s OSHP fails=0x%x\n",
66bef8c0	274	__func__, (char *)string.pointer, status);
aad20cab KK	275	else
aad20cab KK	276	dbg("%s:%s OSHP not found\n",
66bef8c0	277	__func__, (char *)string.pointer);
783c49fc	278	else
66bef8c0	279	pr_debug("%s:%s OSHP passes\n", __func__,
b2e6e3ba MT	280	(char *)string.pointer);
b2e6e3ba MT	281
81b26bca	282	kfree(string.pointer);
783c49fc KA	283	return status;
783c49fc KA	284	}
783c49fc	285
e81995bb	286	/* pci_get_hp_params
783c49fc	287	*
6a29172b	288	* @dev - the pci_dev for which we want parameters
783c49fc KA	289	* @hpp - allocated by the caller
783c49fc KA	290	*/
e81995bb	291	int pci_get_hp_params(struct pci_dev dev, struct hotplug_params hpp)
783c49fc	292	{
6a29172b	293	acpi_status status;
7430e34c	294	acpi_handle handle, phandle;
267efd7e KK	295	struct pci_bus *pbus;
	296
	297	handle = NULL;
6a29172b	298	for (pbus = dev->bus; pbus; pbus = pbus->parent) {
267efd7e KK	299	handle = acpi_pci_get_bridge_handle(pbus);
267efd7e KK	300	if (handle)
7430e34c	301	break;
267efd7e	302	}
783c49fc KA	303
	304	/*
	305	* _HPP settings apply to all child buses, until another _HPP is
	306	* encountered. If we don't find an _HPP for the input pci dev,
	307	* look for it in the parent device scope since that would apply to
e81995bb	308	* this pci dev.
783c49fc	309	*/
7430e34c	310	while (handle) {
e22b7350 KK	311	status = acpi_run_hpx(handle, hpp);
e22b7350 KK	312	if (ACPI_SUCCESS(status))
6a29172b	313	return 0;
783c49fc	314	status = acpi_run_hpp(handle, hpp);
7430e34c	315	if (ACPI_SUCCESS(status))
6a29172b	316	return 0;
27558203	317	if (acpi_is_root_bridge(handle))
7430e34c KK	318	break;
	319	status = acpi_get_parent(handle, &phandle);
	320	if (ACPI_FAILURE(status))
783c49fc	321	break;
7430e34c	322	handle = phandle;
1da177e4	323	}
6a29172b	324	return -ENODEV;
1da177e4	325	}
e81995bb	326	EXPORT_SYMBOL_GPL(pci_get_hp_params);
783c49fc	327
ac9c052d KK	328	/**
	329	* acpi_get_hp_hw_control_from_firmware
	330	* @dev: the pci_dev of the bridge that has a hotplug controller
	331	* @flags: requested control bits for _OSC
	332	*
	333	* Attempt to take hotplug control from firmware.
	334	*/
d391f00f	335	int acpi_get_hp_hw_control_from_firmware(struct pci_dev *pdev, u32 flags)
ac9c052d KK	336	{
ac9c052d KK	337	acpi_status status;
e0d94bee	338	acpi_handle chandle, handle;
ac9c052d KK	339	struct acpi_buffer string = { ACPI_ALLOCATE_BUFFER, NULL };
	340
	341	flags &= (OSC_PCI_EXPRESS_NATIVE_HP_CONTROL \|
	342	OSC_SHPC_NATIVE_HP_CONTROL \|
	343	OSC_PCI_EXPRESS_CAP_STRUCTURE_CONTROL);
	344	if (!flags) {
	345	err("Invalid flags %u specified!\n", flags);
	346	return -EINVAL;
	347	}
	348
	349	/*
	350	* Per PCI firmware specification, we should run the ACPI _OSC
	351	* method to get control of hotplug hardware before using it. If
	352	* an _OSC is missing, we look for an OSHP to do the same thing.
e0d94bee JS	353	* To handle different BIOS behavior, we look for _OSC on a root
	354	* bridge preferentially (according to PCI fw spec). Later for
	355	* OSHP within the scope of the hotplug controller and its parents,
ac9c052d KK	356	* upto the host bridge under which this controller exists.
ac9c052d KK	357	*/
056c58e8	358	handle = acpi_find_root_bridge_handle(pdev);
e0d94bee JS	359	if (handle) {
	360	acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
	361	dbg("Trying to get hotplug control for %s\n",
	362	(char *)string.pointer);
9f5404d8	363	status = acpi_pci_osc_control_set(handle, flags);
e0d94bee JS	364	if (ACPI_SUCCESS(status))
e0d94bee JS	365	goto got_one;
9b536e0b KK	366	if (status == AE_SUPPORT)
9b536e0b KK	367	goto no_control;
e0d94bee JS	368	kfree(string.pointer);
	369	string = (struct acpi_buffer){ ACPI_ALLOCATE_BUFFER, NULL };
	370	}
	371
d391f00f KK	372	handle = DEVICE_ACPI_HANDLE(&pdev->dev);
d391f00f KK	373	if (!handle) {
ac9c052d KK	374	/*
	375	* This hotplug controller was not listed in the ACPI name
	376	* space at all. Try to get acpi handle of parent pci bus.
	377	*/
d391f00f KK	378	struct pci_bus *pbus;
	379	for (pbus = pdev->bus; pbus; pbus = pbus->parent) {
	380	handle = acpi_pci_get_bridge_handle(pbus);
	381	if (handle)
	382	break;
	383	}
ac9c052d KK	384	}
	385
	386	while (handle) {
	387	acpi_get_name(handle, ACPI_FULL_PATHNAME, &string);
	388	dbg("Trying to get hotplug control for %s \n",
	389	(char *)string.pointer);
e0d94bee JS	390	status = acpi_run_oshp(handle);
	391	if (ACPI_SUCCESS(status))
	392	goto got_one;
27558203	393	if (acpi_is_root_bridge(handle))
ac9c052d KK	394	break;
	395	chandle = handle;
	396	status = acpi_get_parent(chandle, &handle);
	397	if (ACPI_FAILURE(status))
	398	break;
	399	}
9b536e0b	400	no_control:
ac9c052d	401	dbg("Cannot get control of hotplug hardware for pci %s\n",
d391f00f	402	pci_name(pdev));
ac9c052d KK	403	kfree(string.pointer);
ac9c052d KK	404	return -ENODEV;
e0d94bee	405	got_one:
d391f00f KK	406	dbg("Gained control for hotplug HW for pci %s (%s)\n",
d391f00f KK	407	pci_name(pdev), (char *)string.pointer);
e0d94bee JS	408	kfree(string.pointer);
e0d94bee JS	409	return 0;
ac9c052d KK	410	}
ac9c052d KK	411	EXPORT_SYMBOL(acpi_get_hp_hw_control_from_firmware);
1da177e4	412
e8c331e9 KK	413	static int is_ejectable(acpi_handle handle)
	414	{
	415	acpi_status status;
	416	acpi_handle tmp;
	417	unsigned long long removable;
	418	status = acpi_get_handle(handle, "_ADR", &tmp);
	419	if (ACPI_FAILURE(status))
	420	return 0;
	421	status = acpi_get_handle(handle, "_EJ0", &tmp);
	422	if (ACPI_SUCCESS(status))
	423	return 1;
	424	status = acpi_evaluate_integer(handle, "_RMV", NULL, &removable);
	425	if (ACPI_SUCCESS(status) && removable)
	426	return 1;
	427	return 0;
	428	}
	429
	430	/**
	431	* acpi_pcihp_check_ejectable - check if handle is ejectable ACPI PCI slot
	432	* @pbus: the PCI bus of the PCI slot corresponding to 'handle'
	433	* @handle: ACPI handle to check
	434	*
	435	* Return 1 if handle is ejectable PCI slot, 0 otherwise.
	436	*/
	437	int acpi_pci_check_ejectable(struct pci_bus *pbus, acpi_handle handle)
	438	{
	439	acpi_handle bridge_handle, parent_handle;
	440
	441	if (!(bridge_handle = acpi_pci_get_bridge_handle(pbus)))
	442	return 0;
	443	if ((ACPI_FAILURE(acpi_get_parent(handle, &parent_handle))))
	444	return 0;
	445	if (bridge_handle != parent_handle)
	446	return 0;
	447	return is_ejectable(handle);
	448	}
	449	EXPORT_SYMBOL_GPL(acpi_pci_check_ejectable);
	450
	451	static acpi_status
	452	check_hotplug(acpi_handle handle, u32 lvl, void context, void *rv)
	453	{
	454	int found = (int )context;
	455	if (is_ejectable(handle)) {
	456	*found = 1;
	457	return AE_CTRL_TERMINATE;
	458	}
	459	return AE_OK;
	460	}
	461
	462	/**
	463	* acpi_pci_detect_ejectable - check if the PCI bus has ejectable slots
7f538669	464	* @handle - handle of the PCI bus to scan
e8c331e9 KK	465	*
	466	* Returns 1 if the PCI bus has ACPI based ejectable slots, 0 otherwise.
	467	*/
7f538669	468	int acpi_pci_detect_ejectable(acpi_handle handle)
e8c331e9	469	{
e8c331e9 KK	470	int found = 0;
e8c331e9 KK	471
7f538669 AC	472	if (!handle)
	473	return found;
	474
	475	acpi_walk_namespace(ACPI_TYPE_DEVICE, handle, 1,
2263576c	476	check_hotplug, NULL, (void *)&found, NULL);
e8c331e9 KK	477	return found;
	478	}
	479	EXPORT_SYMBOL_GPL(acpi_pci_detect_ejectable);
	480
aad20cab KK	481	module_param(debug_acpi, bool, 0644);
aad20cab KK	482	MODULE_PARM_DESC(debug_acpi, "Debugging mode for ACPI enabled or not");