mirror of
https://github.com/torvalds/linux.git
synced 2024-12-06 11:01:43 +00:00
b71a3b2944
Use helpers to access irq_cfg data structure associated with IRQ, instead of accessing irq_data->chip_data directly. Later we can rewrite those helpers to support hierarchy irqdomain. Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com> Cc: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> Cc: Tony Luck <tony.luck@intel.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: iommu@lists.linux-foundation.org Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Rafael J. Wysocki <rjw@rjwysocki.net> Cc: Bjorn Helgaas <bhelgaas@google.com> Cc: Randy Dunlap <rdunlap@infradead.org> Cc: Yinghai Lu <yinghai@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Joerg Roedel <joro@8bytes.org> Link: http://lkml.kernel.org/r/1414397531-28254-18-git-send-email-jiang.liu@linux.intel.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
391 lines
8.3 KiB
C
391 lines
8.3 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 <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 disable_irq_remap;
|
|
int irq_remap_broken;
|
|
int disable_sourceid_checking;
|
|
int no_x2apic_optout;
|
|
|
|
static struct irq_remap_ops *remap_ops;
|
|
|
|
static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec);
|
|
static int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq,
|
|
int index, int sub_handle);
|
|
static int set_remapped_irq_affinity(struct irq_data *data,
|
|
const struct cpumask *mask,
|
|
bool force);
|
|
|
|
static bool irq_remapped(struct irq_cfg *cfg)
|
|
{
|
|
return (cfg->remapped == 1);
|
|
}
|
|
|
|
static void irq_remapping_disable_io_apic(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 (cpu_has_apic || apic_from_smp_config())
|
|
disconnect_bsp_APIC(0);
|
|
}
|
|
|
|
static int do_setup_msi_irqs(struct pci_dev *dev, int nvec)
|
|
{
|
|
int ret, sub_handle, nvec_pow2, index = 0;
|
|
unsigned int irq;
|
|
struct msi_desc *msidesc;
|
|
|
|
msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
|
|
|
|
irq = irq_alloc_hwirqs(nvec, dev_to_node(&dev->dev));
|
|
if (irq == 0)
|
|
return -ENOSPC;
|
|
|
|
nvec_pow2 = __roundup_pow_of_two(nvec);
|
|
for (sub_handle = 0; sub_handle < nvec; sub_handle++) {
|
|
if (!sub_handle) {
|
|
index = msi_alloc_remapped_irq(dev, irq, nvec_pow2);
|
|
if (index < 0) {
|
|
ret = index;
|
|
goto error;
|
|
}
|
|
} else {
|
|
ret = msi_setup_remapped_irq(dev, irq + sub_handle,
|
|
index, sub_handle);
|
|
if (ret < 0)
|
|
goto error;
|
|
}
|
|
ret = setup_msi_irq(dev, msidesc, irq, sub_handle);
|
|
if (ret < 0)
|
|
goto error;
|
|
}
|
|
return 0;
|
|
|
|
error:
|
|
irq_free_hwirqs(irq, nvec);
|
|
|
|
/*
|
|
* Restore altered MSI descriptor fields and prevent just destroyed
|
|
* IRQs from tearing down again in default_teardown_msi_irqs()
|
|
*/
|
|
msidesc->irq = 0;
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int do_setup_msix_irqs(struct pci_dev *dev, int nvec)
|
|
{
|
|
int node, ret, sub_handle, index = 0;
|
|
struct msi_desc *msidesc;
|
|
unsigned int irq;
|
|
|
|
node = dev_to_node(&dev->dev);
|
|
sub_handle = 0;
|
|
|
|
list_for_each_entry(msidesc, &dev->msi_list, list) {
|
|
|
|
irq = irq_alloc_hwirq(node);
|
|
if (irq == 0)
|
|
return -1;
|
|
|
|
if (sub_handle == 0)
|
|
ret = index = msi_alloc_remapped_irq(dev, irq, nvec);
|
|
else
|
|
ret = msi_setup_remapped_irq(dev, irq, index, sub_handle);
|
|
|
|
if (ret < 0)
|
|
goto error;
|
|
|
|
ret = setup_msi_irq(dev, msidesc, irq, 0);
|
|
if (ret < 0)
|
|
goto error;
|
|
|
|
sub_handle += 1;
|
|
irq += 1;
|
|
}
|
|
|
|
return 0;
|
|
|
|
error:
|
|
irq_free_hwirq(irq);
|
|
return ret;
|
|
}
|
|
|
|
static int irq_remapping_setup_msi_irqs(struct pci_dev *dev,
|
|
int nvec, int type)
|
|
{
|
|
if (type == PCI_CAP_ID_MSI)
|
|
return do_setup_msi_irqs(dev, nvec);
|
|
else
|
|
return do_setup_msix_irqs(dev, nvec);
|
|
}
|
|
|
|
static void eoi_ioapic_pin_remapped(int apic, int pin, int vector)
|
|
{
|
|
/*
|
|
* Intr-remapping uses pin number as the virtual vector
|
|
* in the RTE. Actual vector is programmed in
|
|
* intr-remapping table entry. Hence for the io-apic
|
|
* EOI we use the pin number.
|
|
*/
|
|
io_apic_eoi(apic, pin);
|
|
}
|
|
|
|
static void __init irq_remapping_modify_x86_ops(void)
|
|
{
|
|
x86_io_apic_ops.disable = irq_remapping_disable_io_apic;
|
|
x86_io_apic_ops.set_affinity = set_remapped_irq_affinity;
|
|
x86_io_apic_ops.setup_entry = setup_ioapic_remapped_entry;
|
|
x86_io_apic_ops.eoi_ioapic_pin = eoi_ioapic_pin_remapped;
|
|
x86_msi.setup_msi_irqs = irq_remapping_setup_msi_irqs;
|
|
x86_msi.setup_hpet_msi = setup_hpet_msi_remapped;
|
|
x86_msi.compose_msi_msg = compose_remapped_msi_msg;
|
|
}
|
|
|
|
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;
|
|
else if (!strncmp(str, "off", 3))
|
|
disable_irq_remap = 1;
|
|
else if (!strncmp(str, "nosid", 5))
|
|
disable_sourceid_checking = 1;
|
|
else if (!strncmp(str, "no_x2apic_optout", 16))
|
|
no_x2apic_optout = 1;
|
|
|
|
str += strcspn(str, ",");
|
|
while (*str == ',')
|
|
str++;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
early_param("intremap", setup_irqremap);
|
|
|
|
void __init setup_irq_remapping_ops(void)
|
|
{
|
|
remap_ops = &intel_irq_remap_ops;
|
|
|
|
#ifdef CONFIG_AMD_IOMMU
|
|
if (amd_iommu_irq_ops.prepare() == 0)
|
|
remap_ops = &amd_iommu_irq_ops;
|
|
#endif
|
|
}
|
|
|
|
void set_irq_remapping_broken(void)
|
|
{
|
|
irq_remap_broken = 1;
|
|
}
|
|
|
|
int irq_remapping_supported(void)
|
|
{
|
|
if (disable_irq_remap)
|
|
return 0;
|
|
|
|
if (!remap_ops || !remap_ops->supported)
|
|
return 0;
|
|
|
|
return remap_ops->supported();
|
|
}
|
|
|
|
int __init irq_remapping_prepare(void)
|
|
{
|
|
if (!remap_ops || !remap_ops->prepare)
|
|
return -ENODEV;
|
|
|
|
return remap_ops->prepare();
|
|
}
|
|
|
|
int __init irq_remapping_enable(void)
|
|
{
|
|
int ret;
|
|
|
|
if (!remap_ops || !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 ||
|
|
!remap_ops->disable)
|
|
return;
|
|
|
|
remap_ops->disable();
|
|
}
|
|
|
|
int irq_remapping_reenable(int mode)
|
|
{
|
|
if (!irq_remapping_enabled ||
|
|
!remap_ops ||
|
|
!remap_ops->reenable)
|
|
return 0;
|
|
|
|
return remap_ops->reenable(mode);
|
|
}
|
|
|
|
int __init irq_remap_enable_fault_handling(void)
|
|
{
|
|
if (!irq_remapping_enabled)
|
|
return 0;
|
|
|
|
if (!remap_ops || !remap_ops->enable_faulting)
|
|
return -ENODEV;
|
|
|
|
return remap_ops->enable_faulting();
|
|
}
|
|
|
|
int setup_ioapic_remapped_entry(int irq,
|
|
struct IO_APIC_route_entry *entry,
|
|
unsigned int destination, int vector,
|
|
struct io_apic_irq_attr *attr)
|
|
{
|
|
if (!remap_ops || !remap_ops->setup_ioapic_entry)
|
|
return -ENODEV;
|
|
|
|
return remap_ops->setup_ioapic_entry(irq, entry, destination,
|
|
vector, attr);
|
|
}
|
|
|
|
static int set_remapped_irq_affinity(struct irq_data *data,
|
|
const struct cpumask *mask, bool force)
|
|
{
|
|
if (!config_enabled(CONFIG_SMP) || !remap_ops ||
|
|
!remap_ops->set_affinity)
|
|
return 0;
|
|
|
|
return remap_ops->set_affinity(data, mask, force);
|
|
}
|
|
|
|
void free_remapped_irq(int irq)
|
|
{
|
|
struct irq_cfg *cfg = irq_cfg(irq);
|
|
|
|
if (!remap_ops || !remap_ops->free_irq)
|
|
return;
|
|
|
|
if (irq_remapped(cfg))
|
|
remap_ops->free_irq(irq);
|
|
}
|
|
|
|
void compose_remapped_msi_msg(struct pci_dev *pdev,
|
|
unsigned int irq, unsigned int dest,
|
|
struct msi_msg *msg, u8 hpet_id)
|
|
{
|
|
struct irq_cfg *cfg = irq_cfg(irq);
|
|
|
|
if (!irq_remapped(cfg))
|
|
native_compose_msi_msg(pdev, irq, dest, msg, hpet_id);
|
|
else if (remap_ops && remap_ops->compose_msi_msg)
|
|
remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
|
|
}
|
|
|
|
static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec)
|
|
{
|
|
if (!remap_ops || !remap_ops->msi_alloc_irq)
|
|
return -ENODEV;
|
|
|
|
return remap_ops->msi_alloc_irq(pdev, irq, nvec);
|
|
}
|
|
|
|
static int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq,
|
|
int index, int sub_handle)
|
|
{
|
|
if (!remap_ops || !remap_ops->msi_setup_irq)
|
|
return -ENODEV;
|
|
|
|
return remap_ops->msi_setup_irq(pdev, irq, index, sub_handle);
|
|
}
|
|
|
|
int setup_hpet_msi_remapped(unsigned int irq, unsigned int id)
|
|
{
|
|
int ret;
|
|
|
|
if (!remap_ops || !remap_ops->alloc_hpet_msi)
|
|
return -ENODEV;
|
|
|
|
ret = remap_ops->alloc_hpet_msi(irq, id);
|
|
if (ret)
|
|
return -EINVAL;
|
|
|
|
return default_setup_hpet_msi(irq, id);
|
|
}
|
|
|
|
void panic_if_irq_remap(const char *msg)
|
|
{
|
|
if (irq_remapping_enabled)
|
|
panic(msg);
|
|
}
|
|
|
|
static void ir_ack_apic_edge(struct irq_data *data)
|
|
{
|
|
ack_APIC_irq();
|
|
}
|
|
|
|
static void ir_ack_apic_level(struct irq_data *data)
|
|
{
|
|
ack_APIC_irq();
|
|
eoi_ioapic_irq(data->irq, irqd_cfg(data));
|
|
}
|
|
|
|
static void ir_print_prefix(struct irq_data *data, struct seq_file *p)
|
|
{
|
|
seq_printf(p, " IR-%s", data->chip->name);
|
|
}
|
|
|
|
void irq_remap_modify_chip_defaults(struct irq_chip *chip)
|
|
{
|
|
chip->irq_print_chip = ir_print_prefix;
|
|
chip->irq_ack = ir_ack_apic_edge;
|
|
chip->irq_eoi = ir_ack_apic_level;
|
|
chip->irq_set_affinity = x86_io_apic_ops.set_affinity;
|
|
}
|
|
|
|
bool setup_remapped_irq(int irq, struct irq_cfg *cfg, struct irq_chip *chip)
|
|
{
|
|
if (!irq_remapped(cfg))
|
|
return false;
|
|
irq_set_status_flags(irq, IRQ_MOVE_PCNTXT);
|
|
irq_remap_modify_chip_defaults(chip);
|
|
return true;
|
|
}
|