/* * This program is free software; you can redistribute it and/or modify it * under the terms and conditions of the GNU General Public License, * version 2, as published by the Free Software Foundation. * * This program is distributed in the hope it will be useful, but WITHOUT * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or * FITNESS FOR A PARTICULAR PURPOSE. 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., 59 Temple * Place - Suite 330, Boston, MA 02111-1307 USA. */ #include #include #include #include #include #include static void parse_iommu_param(char *s); static int iommu_populate_page_table(struct domain *d); /* * The 'iommu' parameter enables the IOMMU. Optional comma separated * value may contain: * * off|no|false|disable Disable IOMMU (default) * force|required Don't boot unless IOMMU is enabled * workaround_bios_bug Workaround some bios issue to still enable VT-d, don't guarantee security * dom0-passthrough No DMA translation at all for Dom0 * dom0-strict No 1:1 memory mapping for Dom0 * no-snoop Disable VT-d Snoop Control * no-qinval Disable VT-d Queued Invalidation * no-intremap Disable VT-d Interrupt Remapping */ custom_param("iommu", parse_iommu_param); bool_t __read_mostly iommu_enabled = 1; bool_t __read_mostly force_iommu; bool_t __initdata iommu_dom0_strict; bool_t __read_mostly iommu_verbose; bool_t __read_mostly iommu_workaround_bios_bug; bool_t __read_mostly iommu_passthrough; bool_t __read_mostly iommu_snoop = 1; bool_t __read_mostly iommu_qinval = 1; bool_t __read_mostly iommu_intremap = 1; bool_t __read_mostly iommu_hap_pt_share = 1; bool_t __read_mostly iommu_debug; bool_t __read_mostly iommu_amd_perdev_vector_map = 1; bool_t __read_mostly amd_iommu_perdev_intremap; static void __init parse_iommu_param(char *s) { char *ss; do { ss = strchr(s, ','); if ( ss ) *ss = '\0'; if ( !parse_bool(s) ) iommu_enabled = 0; else if ( !strcmp(s, "force") || !strcmp(s, "required") ) force_iommu = 1; else if ( !strcmp(s, "workaround_bios_bug") ) iommu_workaround_bios_bug = 1; else if ( !strcmp(s, "verbose") ) iommu_verbose = 1; else if ( !strcmp(s, "no-snoop") ) iommu_snoop = 0; else if ( !strcmp(s, "no-qinval") ) iommu_qinval = 0; else if ( !strcmp(s, "no-intremap") ) iommu_intremap = 0; else if ( !strcmp(s, "debug") ) iommu_debug = 1; else if ( !strcmp(s, "amd-iommu-perdev-intremap") ) amd_iommu_perdev_intremap = 1; else if ( !strcmp(s, "dom0-passthrough") ) iommu_passthrough = 1; else if ( !strcmp(s, "dom0-strict") ) iommu_dom0_strict = 1; else if ( !strcmp(s, "sharept") ) iommu_hap_pt_share = 1; else if ( !strcmp(s, "no-perdev-vector-map") ) iommu_amd_perdev_vector_map = 0; s = ss + 1; } while ( ss ); } int iommu_domain_init(struct domain *d) { struct hvm_iommu *hd = domain_hvm_iommu(d); spin_lock_init(&hd->mapping_lock); INIT_LIST_HEAD(&hd->g2m_ioport_list); INIT_LIST_HEAD(&hd->mapped_rmrrs); if ( !iommu_enabled ) return 0; hd->platform_ops = iommu_get_ops(); return hd->platform_ops->init(d); } void __init iommu_dom0_init(struct domain *d) { struct hvm_iommu *hd = domain_hvm_iommu(d); if ( !iommu_enabled ) return; d->need_iommu = !!iommu_dom0_strict; if ( need_iommu(d) ) { struct page_info *page; unsigned int i = 0; page_list_for_each ( page, &d->page_list ) { unsigned long mfn = page_to_mfn(page); unsigned int mapping = IOMMUF_readable; if ( ((page->u.inuse.type_info & PGT_count_mask) == 0) || ((page->u.inuse.type_info & PGT_type_mask) == PGT_writable_page) ) mapping |= IOMMUF_writable; hd->platform_ops->map_page(d, mfn, mfn, mapping); if ( !(i++ & 0xfffff) ) process_pending_softirqs(); } } return hd->platform_ops->dom0_init(d); } int iommu_add_device(struct pci_dev *pdev) { struct hvm_iommu *hd; if ( !pdev->domain ) return -EINVAL; ASSERT(spin_is_locked(&pcidevs_lock)); hd = domain_hvm_iommu(pdev->domain); if ( !iommu_enabled || !hd->platform_ops ) return 0; return hd->platform_ops->add_device(pdev); } int iommu_remove_device(struct pci_dev *pdev) { struct hvm_iommu *hd; if ( !pdev->domain ) return -EINVAL; hd = domain_hvm_iommu(pdev->domain); if ( !iommu_enabled || !hd->platform_ops ) return 0; return hd->platform_ops->remove_device(pdev); } int assign_device(struct domain *d, u8 bus, u8 devfn) { struct hvm_iommu *hd = domain_hvm_iommu(d); int rc = 0; if ( !iommu_enabled || !hd->platform_ops ) return 0; spin_lock(&pcidevs_lock); if ( (rc = hd->platform_ops->assign_device(d, bus, devfn)) ) goto done; if ( has_arch_pdevs(d) && !need_iommu(d) ) { d->need_iommu = 1; if ( !iommu_use_hap_pt(d) ) rc = iommu_populate_page_table(d); goto done; } done: spin_unlock(&pcidevs_lock); return rc; } static int iommu_populate_page_table(struct domain *d) { struct hvm_iommu *hd = domain_hvm_iommu(d); struct page_info *page; int rc; spin_lock(&d->page_alloc_lock); page_list_for_each ( page, &d->page_list ) { if ( is_hvm_domain(d) || (page->u.inuse.type_info & PGT_type_mask) == PGT_writable_page ) { BUG_ON(SHARED_M2P(mfn_to_gmfn(d, page_to_mfn(page)))); rc = hd->platform_ops->map_page( d, mfn_to_gmfn(d, page_to_mfn(page)), page_to_mfn(page), IOMMUF_readable|IOMMUF_writable); if (rc) { spin_unlock(&d->page_alloc_lock); hd->platform_ops->teardown(d); return rc; } } } spin_unlock(&d->page_alloc_lock); return 0; } void iommu_domain_destroy(struct domain *d) { struct hvm_iommu *hd = domain_hvm_iommu(d); struct list_head *ioport_list, *rmrr_list, *tmp; struct g2m_ioport *ioport; struct mapped_rmrr *mrmrr; if ( !iommu_enabled || !hd->platform_ops ) return; if ( need_iommu(d) ) { d->need_iommu = 0; hd->platform_ops->teardown(d); } list_for_each_safe ( ioport_list, tmp, &hd->g2m_ioport_list ) { ioport = list_entry(ioport_list, struct g2m_ioport, list); list_del(&ioport->list); xfree(ioport); } list_for_each_safe ( rmrr_list, tmp, &hd->mapped_rmrrs ) { mrmrr = list_entry(rmrr_list, struct mapped_rmrr, list); list_del(&mrmrr->list); xfree(mrmrr); } } int iommu_map_page(struct domain *d, unsigned long gfn, unsigned long mfn, unsigned int flags) { struct hvm_iommu *hd = domain_hvm_iommu(d); if ( !iommu_enabled || !hd->platform_ops ) return 0; return hd->platform_ops->map_page(d, gfn, mfn, flags); } int iommu_unmap_page(struct domain *d, unsigned long gfn) { struct hvm_iommu *hd = domain_hvm_iommu(d); if ( !iommu_enabled || !hd->platform_ops ) return 0; return hd->platform_ops->unmap_page(d, gfn); } /* caller should hold the pcidevs_lock */ int deassign_device(struct domain *d, u8 bus, u8 devfn) { struct hvm_iommu *hd = domain_hvm_iommu(d); struct pci_dev *pdev = NULL; int ret = 0; if ( !iommu_enabled || !hd->platform_ops ) return -EINVAL; ASSERT(spin_is_locked(&pcidevs_lock)); pdev = pci_get_pdev(0, bus, devfn); if ( !pdev ) return -ENODEV; if ( pdev->domain != d ) { dprintk(XENLOG_ERR VTDPREFIX, "d%d: deassign a device not owned\n", d->domain_id); return -EINVAL; } ret = hd->platform_ops->reassign_device(d, dom0, bus, devfn); if ( ret ) { dprintk(XENLOG_ERR VTDPREFIX, "d%d: Deassign device (%x:%x.%x) failed!\n", d->domain_id, bus, PCI_SLOT(devfn), PCI_FUNC(devfn)); return ret; } if ( !has_arch_pdevs(d) && need_iommu(d) ) { d->need_iommu = 0; hd->platform_ops->teardown(d); } return ret; } int __init iommu_setup(void) { int rc = -ENODEV; bool_t force_intremap = force_iommu && iommu_intremap; if ( iommu_dom0_strict ) iommu_passthrough = 0; if ( iommu_enabled ) { rc = iommu_hardware_setup(); iommu_enabled = (rc == 0); } if ( (force_iommu && !iommu_enabled) || (force_intremap && !iommu_intremap) ) panic("Couldn't enable %s and iommu=required/force\n", !iommu_enabled ? "IOMMU" : "Interrupt Remapping"); if ( !iommu_enabled ) { iommu_snoop = 0; iommu_qinval = 0; iommu_intremap = 0; iommu_passthrough = 0; iommu_dom0_strict = 0; } printk("I/O virtualisation %sabled\n", iommu_enabled ? "en" : "dis"); if ( iommu_enabled ) printk(" - Dom0 mode: %s\n", iommu_passthrough ? "Passthrough" : iommu_dom0_strict ? "Strict" : "Relaxed"); return rc; } int iommu_get_device_group(struct domain *d, u8 bus, u8 devfn, XEN_GUEST_HANDLE_64(uint32) buf, int max_sdevs) { struct hvm_iommu *hd = domain_hvm_iommu(d); struct pci_dev *pdev; int group_id, sdev_id; u32 bdf; int i = 0; const struct iommu_ops *ops = hd->platform_ops; if ( !iommu_enabled || !ops || !ops->get_device_group_id ) return 0; group_id = ops->get_device_group_id(bus, devfn); spin_lock(&pcidevs_lock); for_each_pdev( d, pdev ) { if ( (pdev->bus == bus) && (pdev->devfn == devfn) ) continue; sdev_id = ops->get_device_group_id(pdev->bus, pdev->devfn); if ( (sdev_id == group_id) && (i < max_sdevs) ) { bdf = 0; bdf |= (pdev->bus & 0xff) << 16; bdf |= (pdev->devfn & 0xff) << 8; if ( unlikely(copy_to_guest_offset(buf, i, &bdf, 1)) ) { spin_unlock(&pcidevs_lock); return -1; } i++; } } spin_unlock(&pcidevs_lock); return i; } void iommu_update_ire_from_apic( unsigned int apic, unsigned int reg, unsigned int value) { const struct iommu_ops *ops = iommu_get_ops(); ops->update_ire_from_apic(apic, reg, value); } void iommu_update_ire_from_msi( struct msi_desc *msi_desc, struct msi_msg *msg) { const struct iommu_ops *ops = iommu_get_ops(); ops->update_ire_from_msi(msi_desc, msg); } void iommu_read_msi_from_ire( struct msi_desc *msi_desc, struct msi_msg *msg) { const struct iommu_ops *ops = iommu_get_ops(); ops->read_msi_from_ire(msi_desc, msg); } unsigned int iommu_read_apic_from_ire(unsigned int apic, unsigned int reg) { const struct iommu_ops *ops = iommu_get_ops(); return ops->read_apic_from_ire(apic, reg); } void iommu_resume() { const struct iommu_ops *ops = iommu_get_ops(); if ( iommu_enabled ) ops->resume(); } void iommu_suspend() { const struct iommu_ops *ops = iommu_get_ops(); if ( iommu_enabled ) ops->suspend(); } void iommu_share_p2m_table(struct domain* d) { const struct iommu_ops *ops = iommu_get_ops(); if ( iommu_enabled && is_hvm_domain(d) ) ops->share_p2m(d); } void iommu_crash_shutdown(void) { const struct iommu_ops *ops = iommu_get_ops(); if ( iommu_enabled ) ops->crash_shutdown(); iommu_enabled = 0; } /* * Local variables: * mode: C * c-set-style: "BSD" * c-basic-offset: 4 * indent-tabs-mode: nil * End: */ 2 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 
/*
 *  Button Hotplug driver
 *
 *  Copyright (C) 2008-2010 Gabor Juhos <juhosg@openwrt.org>
 *
 *  Based on the diag.c - GPIO interface driver for Broadcom boards
 *    Copyright (C) 2006 Mike Baker <mbm@openwrt.org>,
 *    Copyright (C) 2006-2007 Felix Fietkau <nbd@openwrt.org>
 *    Copyright (C) 2008 Andy Boyett <agb@openwrt.org>
 *
 *  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.
 */

#include <linux/module.h>
#include <linux/version.h>
#include <linux/kmod.h>
#include <linux/input.h>

#include <linux/workqueue.h>
#include <linux/skbuff.h>
#include <linux/netlink.h>
#include <linux/kobject.h>

#define DRV_NAME	"button-hotplug"
#define DRV_VERSION	"0.4.1"
#define DRV_DESC	"Button Hotplug driver"

#define BH_SKB_SIZE	2048

#define PFX	DRV_NAME ": "

#undef BH_DEBUG

#ifdef BH_DEBUG
#define BH_DBG(fmt, args...) printk(KERN_DEBUG "%s: " fmt, DRV_NAME, ##args )
#else
#define BH_DBG(fmt, args...) do {} while (0)
#endif

#define BH_ERR(fmt, args...) printk(KERN_ERR "%s: " fmt, DRV_NAME, ##args )

#ifndef BIT_MASK
#define BIT_MASK(nr)            (1UL << ((nr) % BITS_PER_LONG))
#endif

struct bh_priv {
	unsigned long		*seen;
	struct input_handle	handle;
};

struct bh_event {
	const char		*name;
	char			*action;
	unsigned long		seen;

	struct sk_buff		*skb;
	struct work_struct	work;
};

struct bh_map {
	unsigned int	code;
	const char	*name;
};

extern u64 uevent_next_seqnum(void);

#define BH_MAP(_code, _name)		\
	{				\
		.code = (_code),	\
		.name = (_name),	\
	}

static struct bh_map button_map[] = {
	BH_MAP(BTN_0,		"BTN_0"),
	BH_MAP(BTN_1,		"BTN_1"),
	BH_MAP(BTN_2,		"BTN_2"),
	BH_MAP(BTN_3,		"BTN_3"),
	BH_MAP(BTN_4,		"BTN_4"),
	BH_MAP(BTN_5,		"BTN_5"),
	BH_MAP(BTN_6,		"BTN_6"),
	BH_MAP(BTN_7,		"BTN_7"),
	BH_MAP(BTN_8,		"BTN_8"),
	BH_MAP(BTN_9,		"BTN_9"),
	BH_MAP(KEY_RESTART,	"reset"),
#ifdef KEY_WPS_BUTTON
	BH_MAP(KEY_WPS_BUTTON,	"wps"),
#endif /* KEY_WPS_BUTTON */
};

/* -------------------------------------------------------------------------*/

static int bh_event_add_var(struct bh_event *event, int argv,
		const char *format, ...)
{
	static char buf[128];
	char *s;
	va_list args;
	int len;

	if (argv)
		return 0;

	va_start(args, format);
	len = vsnprintf(buf, sizeof(buf), format, args);
	va_end(args);

	if (len >= sizeof(buf)) {
		BH_ERR("buffer size too small\n");
		WARN_ON(1);
		return -ENOMEM;
	}

	s = skb_put(event->skb, len + 1);
	strcpy(s, buf);

	BH_DBG("added variable '%s'\n", s);

	return 0;
}

static int button_hotplug_fill_event(struct bh_event *event)
{
	int ret;

	ret = bh_event_add_var(event, 0, "HOME=%s", "/");
	if (ret)
		return ret;

	ret = bh_event_add_var(event, 0, "PATH=%s",
					"/sbin:/bin:/usr/sbin:/usr/bin");
	if (ret)
		return ret;

	ret = bh_event_add_var(event, 0, "SUBSYSTEM=%s", "button");
	if (ret)
		return ret;

	ret = bh_event_add_var(event, 0, "ACTION=%s", event->action);
	if (ret)
		return ret;

	ret = bh_event_add_var(event, 0, "BUTTON=%s", event->name);
	if (ret)
		return ret;

	ret = bh_event_add_var(event, 0, "SEEN=%ld", event->seen);
	if (ret)
		return ret;

	ret = bh_event_add_var(event, 0, "SEQNUM=%llu", uevent_next_seqnum());

	return ret;
}

static void button_hotplug_work(struct work_struct *work)
{
	struct bh_event *event = container_of(work, struct bh_event, work);
	int ret = 0;

	event->skb = alloc_skb(BH_SKB_SIZE, GFP_KERNEL);
	if (!event->skb)
		goto out_free_event;

	ret = bh_event_add_var(event, 0, "%s@", event->action);
	if (ret)
		goto out_free_skb;

	ret = button_hotplug_fill_event(event);
	if (ret)
		goto out_free_skb;

	NETLINK_CB(event->skb).dst_group = 1;
	broadcast_uevent(event->skb, 0, 1, GFP_KERNEL);

 out_free_skb:
	if (ret) {
		BH_ERR("work error %d\n", ret);
		kfree_skb(event->skb);
	}
 out_free_event:
	kfree(event);
}

static int button_hotplug_create_event(const char *name, unsigned long seen,
		int pressed)
{
	struct bh_event *event;

	BH_DBG("create event, name=%s, seen=%lu, pressed=%d\n",
		name, seen, pressed);

	event = kzalloc(sizeof(*event), GFP_KERNEL);
	if (!event)
		return -ENOMEM;

	event->name = name;
	event->seen = seen;
	event->action = pressed ? "pressed" : "released";

	INIT_WORK(&event->work, (void *)(void *)button_hotplug_work);
	schedule_work(&event->work);

	return 0;
}

/* -------------------------------------------------------------------------*/

#ifdef	CONFIG_HOTPLUG
static int button_get_index(unsigned int code)
{
	int i;

	for (i = 0; i < ARRAY_SIZE(button_map); i++)
		if (button_map[i].code == code)
			return i;

	return -1;
}
static void button_hotplug_event(struct input_handle *handle,
			   unsigned int type, unsigned int code, int value)
{
	struct bh_priv *priv = handle->private;
	unsigned long seen = jiffies;
	int btn;

	BH_DBG("event type=%u, code=%u, value=%d\n", type, code, value);

	if (type != EV_KEY)
		return;

	btn = button_get_index(code);
	if (btn < 0)
		return;

	button_hotplug_create_event(button_map[btn].name,
			(seen - priv->seen[btn]) / HZ, value);
	priv->seen[btn] = seen;
}
#else
static void button_hotplug_event(struct input_handle *handle,
			   unsigned int type, unsigned int code, int value)
{
}
#endif	/* CONFIG_HOTPLUG */

static int button_hotplug_connect(struct input_handler *handler,
		struct input_dev *dev, const struct input_device_id *id)
{
	struct bh_priv *priv;
	int ret;
	int i;

	for (i = 0; i < ARRAY_SIZE(button_map); i++)
		if (test_bit(button_map[i].code, dev->keybit))
			break;

	if (i == ARRAY_SIZE(button_map))
		return -ENODEV;

	priv = kzalloc(sizeof(*priv) +
		       (sizeof(unsigned long) * ARRAY_SIZE(button_map)),
		       GFP_KERNEL);
	if (!priv)
		return -ENOMEM;

	priv->seen = (unsigned long *) &priv[1];
	priv->handle.private = priv;
	priv->handle.dev = dev;
	priv->handle.handler = handler;
	priv->handle.name = DRV_NAME;

	ret = input_register_handle(&priv->handle);
	if (ret)
		goto err_free_priv;

	ret = input_open_device(&priv->handle);
	if (ret)
		goto err_unregister_handle;

	BH_DBG("connected to %s\n", dev->name);

	return 0;

 err_unregister_handle:
	input_unregister_handle(&priv->handle);

 err_free_priv:
	kfree(priv);
	return ret;
}

static void button_hotplug_disconnect(struct input_handle *handle)
{
	struct bh_priv *priv = handle->private;

	input_close_device(handle);
	input_unregister_handle(handle);

	kfree(priv);
}

static const struct input_device_id button_hotplug_ids[] = {
	{
                .flags = INPUT_DEVICE_ID_MATCH_EVBIT,
                .evbit = { BIT_MASK(EV_KEY) },
        },
	{
		/* Terminating entry */
	},
};

MODULE_DEVICE_TABLE(input, button_hotplug_ids);

static struct input_handler button_hotplug_handler = {
	.event =	button_hotplug_event,
	.connect =	button_hotplug_connect,
	.disconnect =	button_hotplug_disconnect,
	.name =		DRV_NAME,
	.id_table =	button_hotplug_ids,
};

/* -------------------------------------------------------------------------*/

static int __init button_hotplug_init(void)
{
	int ret;

	printk(KERN_INFO DRV_DESC " version " DRV_VERSION "\n");
	ret = input_register_handler(&button_hotplug_handler);
	if (ret)
		BH_ERR("unable to register input handler\n");

	return ret;
}
module_init(button_hotplug_init);

static void __exit button_hotplug_exit(void)
{
	input_unregister_handler(&button_hotplug_handler);
}
module_exit(button_hotplug_exit);

MODULE_DESCRIPTION(DRV_DESC);
MODULE_VERSION(DRV_VERSION);
MODULE_AUTHOR("Gabor Juhos <juhosg@openwrt.org>");
MODULE_LICENSE("GPL v2");
generated by cgit v1.2.3 (git 2.25.1) at 2026-02-22 21:42:42 +0000