[linux-block.git] / drivers / iommu / irq_remapping.c

// SPDX-License-Identifier: GPL-2.0-only
#include <linux/cpumask.h>
#include <linux/kernel.h>
#include <linux/string.h>
#include <linux/errno.h>
#include <linux/msi.h>
#include <linux/irq.h>
#include <linux/pci.h>
#include <linux/irqdomain.h>

#include <asm/hw_irq.h>
#include <asm/irq_remapping.h>
#include <asm/processor.h>
#include <asm/x86_init.h>
#include <asm/apic.h>
#include <asm/hpet.h>

#include "irq_remapping.h"

int irq_remapping_enabled;
int irq_remap_broken;
int disable_sourceid_checking;
int no_x2apic_optout;

int disable_irq_post = 0;

bool enable_posted_msi __ro_after_init;

static int disable_irq_remap;
static struct irq_remap_ops *remap_ops;

static void irq_remapping_restore_boot_irq_mode(void)
{
	/*
	 * With interrupt-remapping, for now we will use virtual wire A
	 * mode, as virtual wire B is little complex (need to configure
	 * both IOAPIC RTE as well as interrupt-remapping table entry).
	 * As this gets called during crash dump, keep this simple for
	 * now.
	 */
	if (boot_cpu_has(X86_FEATURE_APIC) || apic_from_smp_config())
		disconnect_bsp_APIC(0);
}

static void __init irq_remapping_modify_x86_ops(void)
{
	x86_apic_ops.restore = irq_remapping_restore_boot_irq_mode;
}

static __init int setup_nointremap(char *str)
{
	disable_irq_remap = 1;
	return 0;
}
early_param("nointremap", setup_nointremap);

static __init int setup_irqremap(char *str)
{
	if (!str)
		return -EINVAL;

	while (*str) {
		if (!strncmp(str, "on", 2)) {
			disable_irq_remap = 0;
			disable_irq_post = 0;
		} else if (!strncmp(str, "off", 3)) {
			disable_irq_remap = 1;
			disable_irq_post = 1;
		} else if (!strncmp(str, "nosid", 5))
			disable_sourceid_checking = 1;
		else if (!strncmp(str, "no_x2apic_optout", 16))
			no_x2apic_optout = 1;
		else if (!strncmp(str, "nopost", 6))
			disable_irq_post = 1;
		else if (IS_ENABLED(CONFIG_X86_POSTED_MSI) && !strncmp(str, "posted_msi", 10))
			enable_posted_msi = true;
		str += strcspn(str, ",");
		while (*str == ',')
			str++;
	}

	return 0;
}
early_param("intremap", setup_irqremap);

void set_irq_remapping_broken(void)
{
	irq_remap_broken = 1;
}

bool irq_remapping_cap(enum irq_remap_cap cap)
{
	if (!remap_ops || disable_irq_post)
		return false;

	return (remap_ops->capability & (1 << cap));
}
EXPORT_SYMBOL_GPL(irq_remapping_cap);

int __init irq_remapping_prepare(void)
{
	if (disable_irq_remap)
		return -ENOSYS;

	if (IS_ENABLED(CONFIG_INTEL_IOMMU) &&
	    intel_irq_remap_ops.prepare() == 0)
		remap_ops = &intel_irq_remap_ops;
	else if (IS_ENABLED(CONFIG_AMD_IOMMU) &&
		 amd_iommu_irq_ops.prepare() == 0)
		remap_ops = &amd_iommu_irq_ops;
	else if (IS_ENABLED(CONFIG_HYPERV_IOMMU) &&
		 hyperv_irq_remap_ops.prepare() == 0)
		remap_ops = &hyperv_irq_remap_ops;
	else
		return -ENOSYS;

	return 0;
}

int __init irq_remapping_enable(void)
{
	int ret;

	if (!remap_ops->enable)
		return -ENODEV;

	ret = remap_ops->enable();

	if (irq_remapping_enabled)
		irq_remapping_modify_x86_ops();

	return ret;
}

void irq_remapping_disable(void)
{
	if (irq_remapping_enabled && remap_ops->disable)
		remap_ops->disable();
}

int irq_remapping_reenable(int mode)
{
	if (irq_remapping_enabled && remap_ops->reenable)
		return remap_ops->reenable(mode);

	return 0;
}

int __init irq_remap_enable_fault_handling(void)
{
	if (!irq_remapping_enabled)
		return 0;

	if (!remap_ops->enable_faulting)
		return -ENODEV;

	cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "dmar:enable_fault_handling",
			  remap_ops->enable_faulting, NULL);

	return remap_ops->enable_faulting(smp_processor_id());
}

void panic_if_irq_remap(const char *msg)
{
	if (irq_remapping_enabled)
		panic(msg);
}
Commit	Line	Data
	1	// SPDX-License-Identifier: GPL-2.0-only
	2	#include <linux/cpumask.h>
	3	#include <linux/kernel.h>
	4	#include <linux/string.h>
	5	#include <linux/errno.h>
	6	#include <linux/msi.h>
	7	#include <linux/irq.h>
	8	#include <linux/pci.h>
	9	#include <linux/irqdomain.h>
	10
	11	#include <asm/hw_irq.h>
	12	#include <asm/irq_remapping.h>
	13	#include <asm/processor.h>
	14	#include <asm/x86_init.h>
	15	#include <asm/apic.h>
	16	#include <asm/hpet.h>
	17
	18	#include "irq_remapping.h"
	19
	20	int irq_remapping_enabled;
	21	int irq_remap_broken;
	22	int disable_sourceid_checking;
	23	int no_x2apic_optout;
	24
	25	int disable_irq_post = 0;
	26
	27	bool enable_posted_msi __ro_after_init;
	28
	29	static int disable_irq_remap;
	30	static struct irq_remap_ops *remap_ops;
	31
	32	static void irq_remapping_restore_boot_irq_mode(void)
	33	{
	34	/*
	35	* With interrupt-remapping, for now we will use virtual wire A
	36	* mode, as virtual wire B is little complex (need to configure
	37	* both IOAPIC RTE as well as interrupt-remapping table entry).
	38	* As this gets called during crash dump, keep this simple for
	39	* now.
	40	*/
	41	if (boot_cpu_has(X86_FEATURE_APIC) \|\| apic_from_smp_config())
	42	disconnect_bsp_APIC(0);
	43	}
	44
	45	static void __init irq_remapping_modify_x86_ops(void)
	46	{
	47	x86_apic_ops.restore = irq_remapping_restore_boot_irq_mode;
	48	}
	49
	50	static __init int setup_nointremap(char *str)
	51	{
	52	disable_irq_remap = 1;
	53	return 0;
	54	}
	55	early_param("nointremap", setup_nointremap);
	56
	57	static __init int setup_irqremap(char *str)
	58	{
	59	if (!str)
	60	return -EINVAL;
	61
	62	while (*str) {
	63	if (!strncmp(str, "on", 2)) {
	64	disable_irq_remap = 0;
	65	disable_irq_post = 0;
	66	} else if (!strncmp(str, "off", 3)) {
	67	disable_irq_remap = 1;
	68	disable_irq_post = 1;
	69	} else if (!strncmp(str, "nosid", 5))
	70	disable_sourceid_checking = 1;
	71	else if (!strncmp(str, "no_x2apic_optout", 16))
	72	no_x2apic_optout = 1;
	73	else if (!strncmp(str, "nopost", 6))
	74	disable_irq_post = 1;
	75	else if (IS_ENABLED(CONFIG_X86_POSTED_MSI) && !strncmp(str, "posted_msi", 10))
	76	enable_posted_msi = true;
	77	str += strcspn(str, ",");
	78	while (*str == ',')
	79	str++;
	80	}
	81
	82	return 0;
	83	}
	84	early_param("intremap", setup_irqremap);
	85
	86	void set_irq_remapping_broken(void)
	87	{
	88	irq_remap_broken = 1;
	89	}
	90
	91	bool irq_remapping_cap(enum irq_remap_cap cap)
	92	{
	93	if (!remap_ops \|\| disable_irq_post)
	94	return false;
	95
	96	return (remap_ops->capability & (1 << cap));
	97	}
	98	EXPORT_SYMBOL_GPL(irq_remapping_cap);
	99
	100	int __init irq_remapping_prepare(void)
	101	{
	102	if (disable_irq_remap)
	103	return -ENOSYS;
	104
	105	if (IS_ENABLED(CONFIG_INTEL_IOMMU) &&
	106	intel_irq_remap_ops.prepare() == 0)
	107	remap_ops = &intel_irq_remap_ops;
	108	else if (IS_ENABLED(CONFIG_AMD_IOMMU) &&
	109	amd_iommu_irq_ops.prepare() == 0)
	110	remap_ops = &amd_iommu_irq_ops;
	111	else if (IS_ENABLED(CONFIG_HYPERV_IOMMU) &&
	112	hyperv_irq_remap_ops.prepare() == 0)
	113	remap_ops = &hyperv_irq_remap_ops;
	114	else
	115	return -ENOSYS;
	116
	117	return 0;
	118	}
	119
	120	int __init irq_remapping_enable(void)
	121	{
	122	int ret;
	123
	124	if (!remap_ops->enable)
	125	return -ENODEV;
	126
	127	ret = remap_ops->enable();
	128
	129	if (irq_remapping_enabled)
	130	irq_remapping_modify_x86_ops();
	131
	132	return ret;
	133	}
	134
	135	void irq_remapping_disable(void)
	136	{
	137	if (irq_remapping_enabled && remap_ops->disable)
	138	remap_ops->disable();
	139	}
	140
	141	int irq_remapping_reenable(int mode)
	142	{
	143	if (irq_remapping_enabled && remap_ops->reenable)
	144	return remap_ops->reenable(mode);
	145
	146	return 0;
	147	}
	148
	149	int __init irq_remap_enable_fault_handling(void)
	150	{
	151	if (!irq_remapping_enabled)
	152	return 0;
	153
	154	if (!remap_ops->enable_faulting)
	155	return -ENODEV;
	156
	157	cpuhp_setup_state(CPUHP_AP_ONLINE_DYN, "dmar:enable_fault_handling",
	158	remap_ops->enable_faulting, NULL);
	159
	160	return remap_ops->enable_faulting(smp_processor_id());
	161	}
	162
	163	void panic_if_irq_remap(const char *msg)
	164	{
	165	if (irq_remapping_enabled)
	166	panic(msg);
	167	}