[mirror_ubuntu-bionic-kernel.git] / arch / x86 / kernel / apic / msi.c

/*
 * Support of MSI, HPET and DMAR interrupts.
 *
 * Copyright (C) 1997, 1998, 1999, 2000, 2009 Ingo Molnar, Hajnalka Szabo
 *	Moved from arch/x86/kernel/apic/io_apic.c.
 * Jiang Liu <jiang.liu@linux.intel.com>
 *	Convert to hierarchical irqdomain
 *
 * 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/mm.h>
#include <linux/interrupt.h>
#include <linux/pci.h>
#include <linux/dmar.h>
#include <linux/hpet.h>
#include <linux/msi.h>
#include <asm/irqdomain.h>
#include <asm/msidef.h>
#include <asm/hpet.h>
#include <asm/hw_irq.h>
#include <asm/apic.h>
#include <asm/irq_remapping.h>

static struct irq_domain *msi_default_domain;

static void irq_msi_compose_msg(struct irq_data *data, struct msi_msg *msg)
{
	struct irq_cfg *cfg = irqd_cfg(data);

	msg->address_hi = MSI_ADDR_BASE_HI;

	if (x2apic_enabled())
		msg->address_hi |= MSI_ADDR_EXT_DEST_ID(cfg->dest_apicid);

	msg->address_lo =
		MSI_ADDR_BASE_LO |
		((apic->irq_dest_mode == 0) ?
			MSI_ADDR_DEST_MODE_PHYSICAL :
			MSI_ADDR_DEST_MODE_LOGICAL) |
		((apic->irq_delivery_mode != dest_LowestPrio) ?
			MSI_ADDR_REDIRECTION_CPU :
			MSI_ADDR_REDIRECTION_LOWPRI) |
		MSI_ADDR_DEST_ID(cfg->dest_apicid);

	msg->data =
		MSI_DATA_TRIGGER_EDGE |
		MSI_DATA_LEVEL_ASSERT |
		((apic->irq_delivery_mode != dest_LowestPrio) ?
			MSI_DATA_DELIVERY_FIXED :
			MSI_DATA_DELIVERY_LOWPRI) |
		MSI_DATA_VECTOR(cfg->vector);
}

/*
 * IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
 * which implement the MSI or MSI-X Capability Structure.
 */
static struct irq_chip pci_msi_controller = {
	.name			= "PCI-MSI",
	.irq_unmask		= pci_msi_unmask_irq,
	.irq_mask		= pci_msi_mask_irq,
	.irq_ack		= irq_chip_ack_parent,
	.irq_retrigger		= irq_chip_retrigger_hierarchy,
	.irq_compose_msi_msg	= irq_msi_compose_msg,
	.flags			= IRQCHIP_SKIP_SET_WAKE,
};

int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
{
	struct irq_domain *domain;
	struct irq_alloc_info info;

	init_irq_alloc_info(&info, NULL);
	info.type = X86_IRQ_ALLOC_TYPE_MSI;
	info.msi_dev = dev;

	domain = irq_remapping_get_irq_domain(&info);
	if (domain == NULL)
		domain = msi_default_domain;
	if (domain == NULL)
		return -ENOSYS;

	return msi_domain_alloc_irqs(domain, &dev->dev, nvec);
}

void native_teardown_msi_irq(unsigned int irq)
{
	irq_domain_free_irqs(irq, 1);
}

static irq_hw_number_t pci_msi_get_hwirq(struct msi_domain_info *info,
					 msi_alloc_info_t *arg)
{
	return arg->msi_hwirq;
}

int pci_msi_prepare(struct irq_domain *domain, struct device *dev, int nvec,
		    msi_alloc_info_t *arg)
{
	struct pci_dev *pdev = to_pci_dev(dev);
	struct msi_desc *desc = first_pci_msi_entry(pdev);

	init_irq_alloc_info(arg, NULL);
	arg->msi_dev = pdev;
	if (desc->msi_attrib.is_msix) {
		arg->type = X86_IRQ_ALLOC_TYPE_MSIX;
	} else {
		arg->type = X86_IRQ_ALLOC_TYPE_MSI;
		arg->flags |= X86_IRQ_ALLOC_CONTIGUOUS_VECTORS;
	}

	return 0;
}
EXPORT_SYMBOL_GPL(pci_msi_prepare);

void pci_msi_set_desc(msi_alloc_info_t *arg, struct msi_desc *desc)
{
	arg->msi_hwirq = pci_msi_domain_calc_hwirq(arg->msi_dev, desc);
}
EXPORT_SYMBOL_GPL(pci_msi_set_desc);

static struct msi_domain_ops pci_msi_domain_ops = {
	.get_hwirq	= pci_msi_get_hwirq,
	.msi_prepare	= pci_msi_prepare,
	.set_desc	= pci_msi_set_desc,
};

static struct msi_domain_info pci_msi_domain_info = {
	.flags		= MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
			  MSI_FLAG_PCI_MSIX,
	.ops		= &pci_msi_domain_ops,
	.chip		= &pci_msi_controller,
	.handler	= handle_edge_irq,
	.handler_name	= "edge",
};

void __init arch_init_msi_domain(struct irq_domain *parent)
{
	struct fwnode_handle *fn;

	if (disable_apic)
		return;

	fn = irq_domain_alloc_named_fwnode("PCI-MSI");
	if (fn) {
		msi_default_domain =
			pci_msi_create_irq_domain(fn, &pci_msi_domain_info,
						  parent);
		irq_domain_free_fwnode(fn);
	}
	if (!msi_default_domain)
		pr_warn("failed to initialize irqdomain for MSI/MSI-x.\n");
}

#ifdef CONFIG_IRQ_REMAP
static struct irq_chip pci_msi_ir_controller = {
	.name			= "IR-PCI-MSI",
	.irq_unmask		= pci_msi_unmask_irq,
	.irq_mask		= pci_msi_mask_irq,
	.irq_ack		= irq_chip_ack_parent,
	.irq_retrigger		= irq_chip_retrigger_hierarchy,
	.irq_set_vcpu_affinity	= irq_chip_set_vcpu_affinity_parent,
	.flags			= IRQCHIP_SKIP_SET_WAKE,
};

static struct msi_domain_info pci_msi_ir_domain_info = {
	.flags		= MSI_FLAG_USE_DEF_DOM_OPS | MSI_FLAG_USE_DEF_CHIP_OPS |
			  MSI_FLAG_MULTI_PCI_MSI | MSI_FLAG_PCI_MSIX,
	.ops		= &pci_msi_domain_ops,
	.chip		= &pci_msi_ir_controller,
	.handler	= handle_edge_irq,
	.handler_name	= "edge",
};

struct irq_domain *arch_create_remap_msi_irq_domain(struct irq_domain *parent,
						    const char *name, int id)
{
	struct fwnode_handle *fn;
	struct irq_domain *d;

	fn = irq_domain_alloc_named_id_fwnode(name, id);
	if (!fn)
		return NULL;
	d = pci_msi_create_irq_domain(fn, &pci_msi_ir_domain_info, parent);
	irq_domain_free_fwnode(fn);
	return d;
}
#endif

#ifdef CONFIG_DMAR_TABLE
static void dmar_msi_write_msg(struct irq_data *data, struct msi_msg *msg)
{
	dmar_msi_write(data->irq, msg);
}

static struct irq_chip dmar_msi_controller = {
	.name			= "DMAR-MSI",
	.irq_unmask		= dmar_msi_unmask,
	.irq_mask		= dmar_msi_mask,
	.irq_ack		= irq_chip_ack_parent,
	.irq_set_affinity	= msi_domain_set_affinity,
	.irq_retrigger		= irq_chip_retrigger_hierarchy,
	.irq_compose_msi_msg	= irq_msi_compose_msg,
	.irq_write_msi_msg	= dmar_msi_write_msg,
	.flags			= IRQCHIP_SKIP_SET_WAKE,
};

static irq_hw_number_t dmar_msi_get_hwirq(struct msi_domain_info *info,
					  msi_alloc_info_t *arg)
{
	return arg->dmar_id;
}

static int dmar_msi_init(struct irq_domain *domain,
			 struct msi_domain_info *info, unsigned int virq,
			 irq_hw_number_t hwirq, msi_alloc_info_t *arg)
{
	irq_domain_set_info(domain, virq, arg->dmar_id, info->chip, NULL,
			    handle_edge_irq, arg->dmar_data, "edge");

	return 0;
}

static struct msi_domain_ops dmar_msi_domain_ops = {
	.get_hwirq	= dmar_msi_get_hwirq,
	.msi_init	= dmar_msi_init,
};

static struct msi_domain_info dmar_msi_domain_info = {
	.ops		= &dmar_msi_domain_ops,
	.chip		= &dmar_msi_controller,
};

static struct irq_domain *dmar_get_irq_domain(void)
{
	static struct irq_domain *dmar_domain;
	static DEFINE_MUTEX(dmar_lock);
	struct fwnode_handle *fn;

	mutex_lock(&dmar_lock);
	if (dmar_domain)
		goto out;

	fn = irq_domain_alloc_named_fwnode("DMAR-MSI");
	if (fn) {
		dmar_domain = msi_create_irq_domain(fn, &dmar_msi_domain_info,
						    x86_vector_domain);
		irq_domain_free_fwnode(fn);
	}
out:
	mutex_unlock(&dmar_lock);
	return dmar_domain;
}

int dmar_alloc_hwirq(int id, int node, void *arg)
{
	struct irq_domain *domain = dmar_get_irq_domain();
	struct irq_alloc_info info;

	if (!domain)
		return -1;

	init_irq_alloc_info(&info, NULL);
	info.type = X86_IRQ_ALLOC_TYPE_DMAR;
	info.dmar_id = id;
	info.dmar_data = arg;

	return irq_domain_alloc_irqs(domain, 1, node, &info);
}

void dmar_free_hwirq(int irq)
{
	irq_domain_free_irqs(irq, 1);
}
#endif

/*
 * MSI message composition
 */
#ifdef CONFIG_HPET_TIMER
static inline int hpet_dev_id(struct irq_domain *domain)
{
	struct msi_domain_info *info = msi_get_domain_info(domain);

	return (int)(long)info->data;
}

static void hpet_msi_write_msg(struct irq_data *data, struct msi_msg *msg)
{
	hpet_msi_write(irq_data_get_irq_handler_data(data), msg);
}

static struct irq_chip hpet_msi_controller __ro_after_init = {
	.name = "HPET-MSI",
	.irq_unmask = hpet_msi_unmask,
	.irq_mask = hpet_msi_mask,
	.irq_ack = irq_chip_ack_parent,
	.irq_set_affinity = msi_domain_set_affinity,
	.irq_retrigger = irq_chip_retrigger_hierarchy,
	.irq_compose_msi_msg = irq_msi_compose_msg,
	.irq_write_msi_msg = hpet_msi_write_msg,
	.flags = IRQCHIP_SKIP_SET_WAKE,
};

static irq_hw_number_t hpet_msi_get_hwirq(struct msi_domain_info *info,
					  msi_alloc_info_t *arg)
{
	return arg->hpet_index;
}

static int hpet_msi_init(struct irq_domain *domain,
			 struct msi_domain_info *info, unsigned int virq,
			 irq_hw_number_t hwirq, msi_alloc_info_t *arg)
{
	irq_set_status_flags(virq, IRQ_MOVE_PCNTXT);
	irq_domain_set_info(domain, virq, arg->hpet_index, info->chip, NULL,
			    handle_edge_irq, arg->hpet_data, "edge");

	return 0;
}

static void hpet_msi_free(struct irq_domain *domain,
			  struct msi_domain_info *info, unsigned int virq)
{
	irq_clear_status_flags(virq, IRQ_MOVE_PCNTXT);
}

static struct msi_domain_ops hpet_msi_domain_ops = {
	.get_hwirq	= hpet_msi_get_hwirq,
	.msi_init	= hpet_msi_init,
	.msi_free	= hpet_msi_free,
};

static struct msi_domain_info hpet_msi_domain_info = {
	.ops		= &hpet_msi_domain_ops,
	.chip		= &hpet_msi_controller,
};

struct irq_domain *hpet_create_irq_domain(int hpet_id)
{
	struct msi_domain_info *domain_info;
	struct irq_domain *parent, *d;
	struct irq_alloc_info info;
	struct fwnode_handle *fn;

	if (x86_vector_domain == NULL)
		return NULL;

	domain_info = kzalloc(sizeof(*domain_info), GFP_KERNEL);
	if (!domain_info)
		return NULL;

	*domain_info = hpet_msi_domain_info;
	domain_info->data = (void *)(long)hpet_id;

	init_irq_alloc_info(&info, NULL);
	info.type = X86_IRQ_ALLOC_TYPE_HPET;
	info.hpet_id = hpet_id;
	parent = irq_remapping_get_ir_irq_domain(&info);
	if (parent == NULL)
		parent = x86_vector_domain;
	else
		hpet_msi_controller.name = "IR-HPET-MSI";

	fn = irq_domain_alloc_named_id_fwnode(hpet_msi_controller.name,
					      hpet_id);
	if (!fn) {
		kfree(domain_info);
		return NULL;
	}

	d = msi_create_irq_domain(fn, domain_info, parent);
	irq_domain_free_fwnode(fn);
	return d;
}

int hpet_assign_irq(struct irq_domain *domain, struct hpet_dev *dev,
		    int dev_num)
{
	struct irq_alloc_info info;

	init_irq_alloc_info(&info, NULL);
	info.type = X86_IRQ_ALLOC_TYPE_HPET;
	info.hpet_data = dev;
	info.hpet_id = hpet_dev_id(domain);
	info.hpet_index = dev_num;

	return irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, &info);
}
#endif
Commit	Line	Data
	1	/*
	2	* Support of MSI, HPET and DMAR interrupts.
	3	*
	4	* Copyright (C) 1997, 1998, 1999, 2000, 2009 Ingo Molnar, Hajnalka Szabo
	5	* Moved from arch/x86/kernel/apic/io_apic.c.
	6	* Jiang Liu <jiang.liu@linux.intel.com>
	7	* Convert to hierarchical irqdomain
	8	*
	9	* This program is free software; you can redistribute it and/or modify
	10	* it under the terms of the GNU General Public License version 2 as
	11	* published by the Free Software Foundation.
	12	*/
	13	#include <linux/mm.h>
	14	#include <linux/interrupt.h>
	15	#include <linux/pci.h>
	16	#include <linux/dmar.h>
	17	#include <linux/hpet.h>
	18	#include <linux/msi.h>
	19	#include <asm/irqdomain.h>
	20	#include <asm/msidef.h>
	21	#include <asm/hpet.h>
	22	#include <asm/hw_irq.h>
	23	#include <asm/apic.h>
	24	#include <asm/irq_remapping.h>
	25
	26	static struct irq_domain *msi_default_domain;
	27
	28	static void irq_msi_compose_msg(struct irq_data data, struct msi_msg msg)
	29	{
	30	struct irq_cfg *cfg = irqd_cfg(data);
	31
	32	msg->address_hi = MSI_ADDR_BASE_HI;
	33
	34	if (x2apic_enabled())
	35	msg->address_hi \|= MSI_ADDR_EXT_DEST_ID(cfg->dest_apicid);
	36
	37	msg->address_lo =
	38	MSI_ADDR_BASE_LO \|
	39	((apic->irq_dest_mode == 0) ?
	40	MSI_ADDR_DEST_MODE_PHYSICAL :
	41	MSI_ADDR_DEST_MODE_LOGICAL) \|
	42	((apic->irq_delivery_mode != dest_LowestPrio) ?
	43	MSI_ADDR_REDIRECTION_CPU :
	44	MSI_ADDR_REDIRECTION_LOWPRI) \|
	45	MSI_ADDR_DEST_ID(cfg->dest_apicid);
	46
	47	msg->data =
	48	MSI_DATA_TRIGGER_EDGE \|
	49	MSI_DATA_LEVEL_ASSERT \|
	50	((apic->irq_delivery_mode != dest_LowestPrio) ?
	51	MSI_DATA_DELIVERY_FIXED :
	52	MSI_DATA_DELIVERY_LOWPRI) \|
	53	MSI_DATA_VECTOR(cfg->vector);
	54	}
	55
	56	/*
	57	* IRQ Chip for MSI PCI/PCI-X/PCI-Express Devices,
	58	* which implement the MSI or MSI-X Capability Structure.
	59	*/
	60	static struct irq_chip pci_msi_controller = {
	61	.name = "PCI-MSI",
	62	.irq_unmask = pci_msi_unmask_irq,
	63	.irq_mask = pci_msi_mask_irq,
	64	.irq_ack = irq_chip_ack_parent,
	65	.irq_retrigger = irq_chip_retrigger_hierarchy,
	66	.irq_compose_msi_msg = irq_msi_compose_msg,
	67	.flags = IRQCHIP_SKIP_SET_WAKE,
	68	};
	69
	70	int native_setup_msi_irqs(struct pci_dev *dev, int nvec, int type)
	71	{
	72	struct irq_domain *domain;
	73	struct irq_alloc_info info;
	74
	75	init_irq_alloc_info(&info, NULL);
	76	info.type = X86_IRQ_ALLOC_TYPE_MSI;
	77	info.msi_dev = dev;
	78
	79	domain = irq_remapping_get_irq_domain(&info);
	80	if (domain == NULL)
	81	domain = msi_default_domain;
	82	if (domain == NULL)
	83	return -ENOSYS;
	84
	85	return msi_domain_alloc_irqs(domain, &dev->dev, nvec);
	86	}
	87
	88	void native_teardown_msi_irq(unsigned int irq)
	89	{
	90	irq_domain_free_irqs(irq, 1);
	91	}
	92
	93	static irq_hw_number_t pci_msi_get_hwirq(struct msi_domain_info *info,
	94	msi_alloc_info_t *arg)
	95	{
	96	return arg->msi_hwirq;
	97	}
	98
	99	int pci_msi_prepare(struct irq_domain domain, struct device dev, int nvec,
	100	msi_alloc_info_t *arg)
	101	{
	102	struct pci_dev *pdev = to_pci_dev(dev);
	103	struct msi_desc *desc = first_pci_msi_entry(pdev);
	104
	105	init_irq_alloc_info(arg, NULL);
	106	arg->msi_dev = pdev;
	107	if (desc->msi_attrib.is_msix) {
	108	arg->type = X86_IRQ_ALLOC_TYPE_MSIX;
	109	} else {
	110	arg->type = X86_IRQ_ALLOC_TYPE_MSI;
	111	arg->flags \|= X86_IRQ_ALLOC_CONTIGUOUS_VECTORS;
	112	}
	113
	114	return 0;
	115	}
	116	EXPORT_SYMBOL_GPL(pci_msi_prepare);
	117
	118	void pci_msi_set_desc(msi_alloc_info_t arg, struct msi_desc desc)
	119	{
	120	arg->msi_hwirq = pci_msi_domain_calc_hwirq(arg->msi_dev, desc);
	121	}
	122	EXPORT_SYMBOL_GPL(pci_msi_set_desc);
	123
	124	static struct msi_domain_ops pci_msi_domain_ops = {
	125	.get_hwirq = pci_msi_get_hwirq,
	126	.msi_prepare = pci_msi_prepare,
	127	.set_desc = pci_msi_set_desc,
	128	};
	129
	130	static struct msi_domain_info pci_msi_domain_info = {
	131	.flags = MSI_FLAG_USE_DEF_DOM_OPS \| MSI_FLAG_USE_DEF_CHIP_OPS \|
	132	MSI_FLAG_PCI_MSIX,
	133	.ops = &pci_msi_domain_ops,
	134	.chip = &pci_msi_controller,
	135	.handler = handle_edge_irq,
	136	.handler_name = "edge",
	137	};
	138
	139	void __init arch_init_msi_domain(struct irq_domain *parent)
	140	{
	141	struct fwnode_handle *fn;
	142
	143	if (disable_apic)
	144	return;
	145
	146	fn = irq_domain_alloc_named_fwnode("PCI-MSI");
	147	if (fn) {
	148	msi_default_domain =
	149	pci_msi_create_irq_domain(fn, &pci_msi_domain_info,
	150	parent);
	151	irq_domain_free_fwnode(fn);
	152	}
	153	if (!msi_default_domain)
	154	pr_warn("failed to initialize irqdomain for MSI/MSI-x.\n");
	155	}
	156
	157	#ifdef CONFIG_IRQ_REMAP
	158	static struct irq_chip pci_msi_ir_controller = {
	159	.name = "IR-PCI-MSI",
	160	.irq_unmask = pci_msi_unmask_irq,
	161	.irq_mask = pci_msi_mask_irq,
	162	.irq_ack = irq_chip_ack_parent,
	163	.irq_retrigger = irq_chip_retrigger_hierarchy,
	164	.irq_set_vcpu_affinity = irq_chip_set_vcpu_affinity_parent,
	165	.flags = IRQCHIP_SKIP_SET_WAKE,
	166	};
	167
	168	static struct msi_domain_info pci_msi_ir_domain_info = {
	169	.flags = MSI_FLAG_USE_DEF_DOM_OPS \| MSI_FLAG_USE_DEF_CHIP_OPS \|
	170	MSI_FLAG_MULTI_PCI_MSI \| MSI_FLAG_PCI_MSIX,
	171	.ops = &pci_msi_domain_ops,
	172	.chip = &pci_msi_ir_controller,
	173	.handler = handle_edge_irq,
	174	.handler_name = "edge",
	175	};
	176
	177	struct irq_domain arch_create_remap_msi_irq_domain(struct irq_domain parent,
	178	const char *name, int id)
	179	{
	180	struct fwnode_handle *fn;
	181	struct irq_domain *d;
	182
	183	fn = irq_domain_alloc_named_id_fwnode(name, id);
	184	if (!fn)
	185	return NULL;
	186	d = pci_msi_create_irq_domain(fn, &pci_msi_ir_domain_info, parent);
	187	irq_domain_free_fwnode(fn);
	188	return d;
	189	}
	190	#endif
	191
	192	#ifdef CONFIG_DMAR_TABLE
	193	static void dmar_msi_write_msg(struct irq_data data, struct msi_msg msg)
	194	{
	195	dmar_msi_write(data->irq, msg);
	196	}
	197
	198	static struct irq_chip dmar_msi_controller = {
	199	.name = "DMAR-MSI",
	200	.irq_unmask = dmar_msi_unmask,
	201	.irq_mask = dmar_msi_mask,
	202	.irq_ack = irq_chip_ack_parent,
	203	.irq_set_affinity = msi_domain_set_affinity,
	204	.irq_retrigger = irq_chip_retrigger_hierarchy,
	205	.irq_compose_msi_msg = irq_msi_compose_msg,
	206	.irq_write_msi_msg = dmar_msi_write_msg,
	207	.flags = IRQCHIP_SKIP_SET_WAKE,
	208	};
	209
	210	static irq_hw_number_t dmar_msi_get_hwirq(struct msi_domain_info *info,
	211	msi_alloc_info_t *arg)
	212	{
	213	return arg->dmar_id;
	214	}
	215
	216	static int dmar_msi_init(struct irq_domain *domain,
	217	struct msi_domain_info *info, unsigned int virq,
	218	irq_hw_number_t hwirq, msi_alloc_info_t *arg)
	219	{
	220	irq_domain_set_info(domain, virq, arg->dmar_id, info->chip, NULL,
	221	handle_edge_irq, arg->dmar_data, "edge");
	222
	223	return 0;
	224	}
	225
	226	static struct msi_domain_ops dmar_msi_domain_ops = {
	227	.get_hwirq = dmar_msi_get_hwirq,
	228	.msi_init = dmar_msi_init,
	229	};
	230
	231	static struct msi_domain_info dmar_msi_domain_info = {
	232	.ops = &dmar_msi_domain_ops,
	233	.chip = &dmar_msi_controller,
	234	};
	235
	236	static struct irq_domain *dmar_get_irq_domain(void)
	237	{
	238	static struct irq_domain *dmar_domain;
	239	static DEFINE_MUTEX(dmar_lock);
	240	struct fwnode_handle *fn;
	241
	242	mutex_lock(&dmar_lock);
	243	if (dmar_domain)
	244	goto out;
	245
	246	fn = irq_domain_alloc_named_fwnode("DMAR-MSI");
	247	if (fn) {
	248	dmar_domain = msi_create_irq_domain(fn, &dmar_msi_domain_info,
	249	x86_vector_domain);
	250	irq_domain_free_fwnode(fn);
	251	}
	252	out:
	253	mutex_unlock(&dmar_lock);
	254	return dmar_domain;
	255	}
	256
	257	int dmar_alloc_hwirq(int id, int node, void *arg)
	258	{
	259	struct irq_domain *domain = dmar_get_irq_domain();
	260	struct irq_alloc_info info;
	261
	262	if (!domain)
	263	return -1;
	264
	265	init_irq_alloc_info(&info, NULL);
	266	info.type = X86_IRQ_ALLOC_TYPE_DMAR;
	267	info.dmar_id = id;
	268	info.dmar_data = arg;
	269
	270	return irq_domain_alloc_irqs(domain, 1, node, &info);
	271	}
	272
	273	void dmar_free_hwirq(int irq)
	274	{
	275	irq_domain_free_irqs(irq, 1);
	276	}
	277	#endif
	278
	279	/*
	280	* MSI message composition
	281	*/
	282	#ifdef CONFIG_HPET_TIMER
	283	static inline int hpet_dev_id(struct irq_domain *domain)
	284	{
	285	struct msi_domain_info *info = msi_get_domain_info(domain);
	286
	287	return (int)(long)info->data;
	288	}
	289
	290	static void hpet_msi_write_msg(struct irq_data data, struct msi_msg msg)
	291	{
	292	hpet_msi_write(irq_data_get_irq_handler_data(data), msg);
	293	}
	294
	295	static struct irq_chip hpet_msi_controller __ro_after_init = {
	296	.name = "HPET-MSI",
	297	.irq_unmask = hpet_msi_unmask,
	298	.irq_mask = hpet_msi_mask,
	299	.irq_ack = irq_chip_ack_parent,
	300	.irq_set_affinity = msi_domain_set_affinity,
	301	.irq_retrigger = irq_chip_retrigger_hierarchy,
	302	.irq_compose_msi_msg = irq_msi_compose_msg,
	303	.irq_write_msi_msg = hpet_msi_write_msg,
	304	.flags = IRQCHIP_SKIP_SET_WAKE,
	305	};
	306
	307	static irq_hw_number_t hpet_msi_get_hwirq(struct msi_domain_info *info,
	308	msi_alloc_info_t *arg)
	309	{
	310	return arg->hpet_index;
	311	}
	312
	313	static int hpet_msi_init(struct irq_domain *domain,
	314	struct msi_domain_info *info, unsigned int virq,
	315	irq_hw_number_t hwirq, msi_alloc_info_t *arg)
	316	{
	317	irq_set_status_flags(virq, IRQ_MOVE_PCNTXT);
	318	irq_domain_set_info(domain, virq, arg->hpet_index, info->chip, NULL,
	319	handle_edge_irq, arg->hpet_data, "edge");
	320
	321	return 0;
	322	}
	323
	324	static void hpet_msi_free(struct irq_domain *domain,
	325	struct msi_domain_info *info, unsigned int virq)
	326	{
	327	irq_clear_status_flags(virq, IRQ_MOVE_PCNTXT);
	328	}
	329
	330	static struct msi_domain_ops hpet_msi_domain_ops = {
	331	.get_hwirq = hpet_msi_get_hwirq,
	332	.msi_init = hpet_msi_init,
	333	.msi_free = hpet_msi_free,
	334	};
	335
	336	static struct msi_domain_info hpet_msi_domain_info = {
	337	.ops = &hpet_msi_domain_ops,
	338	.chip = &hpet_msi_controller,
	339	};
	340
	341	struct irq_domain *hpet_create_irq_domain(int hpet_id)
	342	{
	343	struct msi_domain_info *domain_info;
	344	struct irq_domain parent, d;
	345	struct irq_alloc_info info;
	346	struct fwnode_handle *fn;
	347
	348	if (x86_vector_domain == NULL)
	349	return NULL;
	350
	351	domain_info = kzalloc(sizeof(*domain_info), GFP_KERNEL);
	352	if (!domain_info)
	353	return NULL;
	354
	355	*domain_info = hpet_msi_domain_info;
	356	domain_info->data = (void *)(long)hpet_id;
	357
	358	init_irq_alloc_info(&info, NULL);
	359	info.type = X86_IRQ_ALLOC_TYPE_HPET;
	360	info.hpet_id = hpet_id;
	361	parent = irq_remapping_get_ir_irq_domain(&info);
	362	if (parent == NULL)
	363	parent = x86_vector_domain;
	364	else
	365	hpet_msi_controller.name = "IR-HPET-MSI";
	366
	367	fn = irq_domain_alloc_named_id_fwnode(hpet_msi_controller.name,
	368	hpet_id);
	369	if (!fn) {
	370	kfree(domain_info);
	371	return NULL;
	372	}
	373
	374	d = msi_create_irq_domain(fn, domain_info, parent);
	375	irq_domain_free_fwnode(fn);
	376	return d;
	377	}
	378
	379	int hpet_assign_irq(struct irq_domain domain, struct hpet_dev dev,
	380	int dev_num)
	381	{
	382	struct irq_alloc_info info;
	383
	384	init_irq_alloc_info(&info, NULL);
	385	info.type = X86_IRQ_ALLOC_TYPE_HPET;
	386	info.hpet_data = dev;
	387	info.hpet_id = hpet_dev_id(domain);
	388	info.hpet_index = dev_num;
	389
	390	return irq_domain_alloc_irqs(domain, 1, NUMA_NO_NODE, &info);
	391	}
	392	#endif