[deliverable/linux.git] / drivers / pci / hotplug / s390_pci_hpc.c

/*
 * PCI Hot Plug Controller Driver for System z
 *
 * Copyright 2012 IBM Corp.
 *
 * Author(s):
 *   Jan Glauber <jang@linux.vnet.ibm.com>
 */

#define KMSG_COMPONENT "zpci"
#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/pci.h>
#include <linux/pci_hotplug.h>
#include <asm/pci_debug.h>
#include <asm/sclp.h>

#define SLOT_NAME_SIZE	10
static LIST_HEAD(s390_hotplug_slot_list);

MODULE_AUTHOR("Jan Glauber <jang@linux.vnet.ibm.com");
MODULE_DESCRIPTION("Hot Plug PCI Controller for System z");
MODULE_LICENSE("GPL");

static int zpci_fn_configured(enum zpci_state state)
{
	return state == ZPCI_FN_STATE_CONFIGURED ||
	       state == ZPCI_FN_STATE_ONLINE;
}

/*
 * struct slot - slot information for each *physical* slot
 */
struct slot {
	struct list_head slot_list;
	struct hotplug_slot *hotplug_slot;
	struct zpci_dev *zdev;
};

static inline int slot_configure(struct slot *slot)
{
	int ret = sclp_pci_configure(slot->zdev->fid);

	zpci_dbg(3, "conf fid:%x, rc:%d\n", slot->zdev->fid, ret);
	if (!ret)
		slot->zdev->state = ZPCI_FN_STATE_CONFIGURED;

	return ret;
}

static inline int slot_deconfigure(struct slot *slot)
{
	int ret = sclp_pci_deconfigure(slot->zdev->fid);

	zpci_dbg(3, "deconf fid:%x, rc:%d\n", slot->zdev->fid, ret);
	if (!ret)
		slot->zdev->state = ZPCI_FN_STATE_STANDBY;

	return ret;
}

static int enable_slot(struct hotplug_slot *hotplug_slot)
{
	struct slot *slot = hotplug_slot->private;
	int rc;

	if (slot->zdev->state != ZPCI_FN_STATE_STANDBY)
		return -EIO;

	rc = slot_configure(slot);
	if (rc)
		return rc;

	rc = zpci_enable_device(slot->zdev);
	if (rc)
		goto out_deconfigure;

	pci_scan_slot(slot->zdev->bus, ZPCI_DEVFN);
	pci_lock_rescan_remove();
	pci_bus_add_devices(slot->zdev->bus);
	pci_unlock_rescan_remove();

	return rc;

out_deconfigure:
	slot_deconfigure(slot);
	return rc;
}

static int disable_slot(struct hotplug_slot *hotplug_slot)
{
	struct slot *slot = hotplug_slot->private;
	struct pci_dev *pdev;
	int rc;

	if (!zpci_fn_configured(slot->zdev->state))
		return -EIO;

	pdev = pci_get_slot(slot->zdev->bus, ZPCI_DEVFN);
	if (pdev) {
		pci_stop_and_remove_bus_device_locked(pdev);
		pci_dev_put(pdev);
	}

	rc = zpci_disable_device(slot->zdev);
	if (rc)
		return rc;

	return slot_deconfigure(slot);
}

static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
	struct slot *slot = hotplug_slot->private;

	switch (slot->zdev->state) {
	case ZPCI_FN_STATE_STANDBY:
		*value = 0;
		break;
	default:
		*value = 1;
		break;
	}
	return 0;
}

static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
{
	/* if the slot exits it always contains a function */
	*value = 1;
	return 0;
}

static void release_slot(struct hotplug_slot *hotplug_slot)
{
	struct slot *slot = hotplug_slot->private;

	kfree(slot->hotplug_slot->info);
	kfree(slot->hotplug_slot);
	kfree(slot);
}

static struct hotplug_slot_ops s390_hotplug_slot_ops = {
	.enable_slot =		enable_slot,
	.disable_slot =		disable_slot,
	.get_power_status =	get_power_status,
	.get_adapter_status =	get_adapter_status,
};

int zpci_init_slot(struct zpci_dev *zdev)
{
	struct hotplug_slot *hotplug_slot;
	struct hotplug_slot_info *info;
	char name[SLOT_NAME_SIZE];
	struct slot *slot;
	int rc;

	if (!zdev)
		return 0;

	slot = kzalloc(sizeof(*slot), GFP_KERNEL);
	if (!slot)
		goto error;

	hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
	if (!hotplug_slot)
		goto error_hp;
	hotplug_slot->private = slot;

	slot->hotplug_slot = hotplug_slot;
	slot->zdev = zdev;

	info = kzalloc(sizeof(*info), GFP_KERNEL);
	if (!info)
		goto error_info;
	hotplug_slot->info = info;

	hotplug_slot->ops = &s390_hotplug_slot_ops;
	hotplug_slot->release = &release_slot;

	get_power_status(hotplug_slot, &info->power_status);
	get_adapter_status(hotplug_slot, &info->adapter_status);

	snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
	rc = pci_hp_register(slot->hotplug_slot, zdev->bus,
			     ZPCI_DEVFN, name);
	if (rc)
		goto error_reg;

	list_add(&slot->slot_list, &s390_hotplug_slot_list);
	return 0;

error_reg:
	kfree(info);
error_info:
	kfree(hotplug_slot);
error_hp:
	kfree(slot);
error:
	return -ENOMEM;
}

void zpci_exit_slot(struct zpci_dev *zdev)
{
	struct slot *slot, *next;

	list_for_each_entry_safe(slot, next, &s390_hotplug_slot_list,
				 slot_list) {
		if (slot->zdev != zdev)
			continue;
		list_del(&slot->slot_list);
		pci_hp_deregister(slot->hotplug_slot);
	}
}
Commit	Line	Data
7441b062 JG	1	/*
	2	* PCI Hot Plug Controller Driver for System z
	3	*
	4	* Copyright 2012 IBM Corp.
	5	*
	6	* Author(s):
	7	* Jan Glauber <jang@linux.vnet.ibm.com>
	8	*/
	9
896cb7e6 GS	10	#define KMSG_COMPONENT "zpci"
896cb7e6 GS	11	#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
7441b062 JG	12
	13	#include <linux/module.h>
	14	#include <linux/kernel.h>
	15	#include <linux/slab.h>
	16	#include <linux/pci.h>
	17	#include <linux/pci_hotplug.h>
a2ab8333	18	#include <asm/pci_debug.h>
7441b062 JG	19	#include <asm/sclp.h>
	20
	21	#define SLOT_NAME_SIZE 10
	22	static LIST_HEAD(s390_hotplug_slot_list);
	23
	24	MODULE_AUTHOR("Jan Glauber <jang@linux.vnet.ibm.com");
	25	MODULE_DESCRIPTION("Hot Plug PCI Controller for System z");
	26	MODULE_LICENSE("GPL");
	27
	28	static int zpci_fn_configured(enum zpci_state state)
	29	{
	30	return state == ZPCI_FN_STATE_CONFIGURED \|\|
	31	state == ZPCI_FN_STATE_ONLINE;
	32	}
	33
	34	/*
	35	* struct slot - slot information for each physical slot
	36	*/
	37	struct slot {
	38	struct list_head slot_list;
	39	struct hotplug_slot *hotplug_slot;
	40	struct zpci_dev *zdev;
	41	};
	42
4bee2a5d SO	43	static inline int slot_configure(struct slot *slot)
	44	{
	45	int ret = sclp_pci_configure(slot->zdev->fid);
	46
	47	zpci_dbg(3, "conf fid:%x, rc:%d\n", slot->zdev->fid, ret);
	48	if (!ret)
	49	slot->zdev->state = ZPCI_FN_STATE_CONFIGURED;
	50
	51	return ret;
	52	}
	53
	54	static inline int slot_deconfigure(struct slot *slot)
	55	{
	56	int ret = sclp_pci_deconfigure(slot->zdev->fid);
	57
	58	zpci_dbg(3, "deconf fid:%x, rc:%d\n", slot->zdev->fid, ret);
	59	if (!ret)
	60	slot->zdev->state = ZPCI_FN_STATE_STANDBY;
	61
	62	return ret;
	63	}
	64
7441b062 JG	65	static int enable_slot(struct hotplug_slot *hotplug_slot)
	66	{
	67	struct slot *slot = hotplug_slot->private;
	68	int rc;
	69
	70	if (slot->zdev->state != ZPCI_FN_STATE_STANDBY)
	71	return -EIO;
	72
4bee2a5d SO	73	rc = slot_configure(slot);
	74	if (rc)
	75	return rc;
	76
	77	rc = zpci_enable_device(slot->zdev);
	78	if (rc)
	79	goto out_deconfigure;
	80
4bee2a5d	81	pci_scan_slot(slot->zdev->bus, ZPCI_DEVFN);
c4ec84c7	82	pci_lock_rescan_remove();
4bee2a5d	83	pci_bus_add_devices(slot->zdev->bus);
c4ec84c7	84	pci_unlock_rescan_remove();
4bee2a5d SO	85
	86	return rc;
	87
	88	out_deconfigure:
	89	slot_deconfigure(slot);
7441b062 JG	90	return rc;
	91	}
	92
	93	static int disable_slot(struct hotplug_slot *hotplug_slot)
	94	{
	95	struct slot *slot = hotplug_slot->private;
9a99649f	96	struct pci_dev *pdev;
7441b062 JG	97	int rc;
	98
	99	if (!zpci_fn_configured(slot->zdev->state))
	100	return -EIO;
	101
9a99649f SO	102	pdev = pci_get_slot(slot->zdev->bus, ZPCI_DEVFN);
	103	if (pdev) {
	104	pci_stop_and_remove_bus_device_locked(pdev);
	105	pci_dev_put(pdev);
	106	}
8b2a7e60	107
cb65a669 SO	108	rc = zpci_disable_device(slot->zdev);
	109	if (rc)
	110	return rc;
8b2a7e60	111
4bee2a5d	112	return slot_deconfigure(slot);
7441b062 JG	113	}
	114
	115	static int get_power_status(struct hotplug_slot hotplug_slot, u8 value)
	116	{
	117	struct slot *slot = hotplug_slot->private;
	118
	119	switch (slot->zdev->state) {
	120	case ZPCI_FN_STATE_STANDBY:
	121	*value = 0;
	122	break;
	123	default:
	124	*value = 1;
	125	break;
	126	}
	127	return 0;
	128	}
	129
	130	static int get_adapter_status(struct hotplug_slot hotplug_slot, u8 value)
	131	{
	132	/* if the slot exits it always contains a function */
	133	*value = 1;
	134	return 0;
	135	}
	136
	137	static void release_slot(struct hotplug_slot *hotplug_slot)
	138	{
	139	struct slot *slot = hotplug_slot->private;
	140
7441b062 JG	141	kfree(slot->hotplug_slot->info);
	142	kfree(slot->hotplug_slot);
	143	kfree(slot);
	144	}
	145
	146	static struct hotplug_slot_ops s390_hotplug_slot_ops = {
	147	.enable_slot = enable_slot,
	148	.disable_slot = disable_slot,
	149	.get_power_status = get_power_status,
	150	.get_adapter_status = get_adapter_status,
	151	};
	152
67f43f38	153	int zpci_init_slot(struct zpci_dev *zdev)
7441b062 JG	154	{
	155	struct hotplug_slot *hotplug_slot;
	156	struct hotplug_slot_info *info;
	157	char name[SLOT_NAME_SIZE];
	158	struct slot *slot;
	159	int rc;
	160
	161	if (!zdev)
	162	return 0;
	163
	164	slot = kzalloc(sizeof(*slot), GFP_KERNEL);
	165	if (!slot)
	166	goto error;
	167
	168	hotplug_slot = kzalloc(sizeof(*hotplug_slot), GFP_KERNEL);
	169	if (!hotplug_slot)
	170	goto error_hp;
	171	hotplug_slot->private = slot;
	172
	173	slot->hotplug_slot = hotplug_slot;
	174	slot->zdev = zdev;
	175
	176	info = kzalloc(sizeof(*info), GFP_KERNEL);
	177	if (!info)
	178	goto error_info;
	179	hotplug_slot->info = info;
	180
	181	hotplug_slot->ops = &s390_hotplug_slot_ops;
	182	hotplug_slot->release = &release_slot;
	183
	184	get_power_status(hotplug_slot, &info->power_status);
	185	get_adapter_status(hotplug_slot, &info->adapter_status);
	186
	187	snprintf(name, SLOT_NAME_SIZE, "%08x", zdev->fid);
	188	rc = pci_hp_register(slot->hotplug_slot, zdev->bus,
	189	ZPCI_DEVFN, name);
1f1dcbd4	190	if (rc)
7441b062	191	goto error_reg;
1f1dcbd4	192
7441b062 JG	193	list_add(&slot->slot_list, &s390_hotplug_slot_list);
	194	return 0;
	195
	196	error_reg:
	197	kfree(info);
	198	error_info:
	199	kfree(hotplug_slot);
	200	error_hp:
	201	kfree(slot);
	202	error:
	203	return -ENOMEM;
	204	}
	205
67f43f38	206	void zpci_exit_slot(struct zpci_dev *zdev)
7441b062	207	{
2ac83ccc	208	struct slot slot, next;
7441b062	209
2ac83ccc GT	210	list_for_each_entry_safe(slot, next, &s390_hotplug_slot_list,
2ac83ccc GT	211	slot_list) {
7441b062 JG	212	if (slot->zdev != zdev)
	213	continue;
	214	list_del(&slot->slot_list);
	215	pci_hp_deregister(slot->hotplug_slot);
	216	}
	217	}