193 lines
4.2 KiB
C
193 lines
4.2 KiB
C
#include <linux/seq_file.h>
|
|
#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;
|
|
|
|
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;
|
|
|
|
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 (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
|
|
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;
|
|
|
|
return remap_ops->enable_faulting();
|
|
}
|
|
|
|
void panic_if_irq_remap(const char *msg)
|
|
{
|
|
if (irq_remapping_enabled)
|
|
panic(msg);
|
|
}
|
|
|
|
/**
|
|
* irq_remapping_get_ir_irq_domain - Get the irqdomain associated with the IOMMU
|
|
* device serving request @info
|
|
* @info: interrupt allocation information, used to identify the IOMMU device
|
|
*
|
|
* It's used to get parent irqdomain for HPET and IOAPIC irqdomains.
|
|
* Returns pointer to IRQ domain, or NULL on failure.
|
|
*/
|
|
struct irq_domain *
|
|
irq_remapping_get_ir_irq_domain(struct irq_alloc_info *info)
|
|
{
|
|
if (!remap_ops || !remap_ops->get_ir_irq_domain)
|
|
return NULL;
|
|
|
|
return remap_ops->get_ir_irq_domain(info);
|
|
}
|
|
|
|
/**
|
|
* irq_remapping_get_irq_domain - Get the irqdomain serving the request @info
|
|
* @info: interrupt allocation information, used to identify the IOMMU device
|
|
*
|
|
* There will be one PCI MSI/MSIX irqdomain associated with each interrupt
|
|
* remapping device, so this interface is used to retrieve the PCI MSI/MSIX
|
|
* irqdomain serving request @info.
|
|
* Returns pointer to IRQ domain, or NULL on failure.
|
|
*/
|
|
struct irq_domain *
|
|
irq_remapping_get_irq_domain(struct irq_alloc_info *info)
|
|
{
|
|
if (!remap_ops || !remap_ops->get_irq_domain)
|
|
return NULL;
|
|
|
|
return remap_ops->get_irq_domain(info);
|
|
}
|