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linux-next/drivers/iommu/irq_remapping.c
Jiang Liu e901176046 iommu/irq_remapping: Normailize the way to detect whether IR is enabled
Refine code by normailizing the way to detect whether IR is enabled.

Signed-off-by: Jiang Liu <jiang.liu@linux.intel.com>
Tested-by: Joerg Roedel <joro@8bytes.org>
Cc: Tony Luck <tony.luck@intel.com>
Cc: iommu@lists.linux-foundation.org
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Link: http://lkml.kernel.org/r/1420615903-28253-17-git-send-email-jiang.liu@linux.intel.com
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
2015-01-15 11:24:24 +01:00

367 lines
8.0 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 irq_remap_broken;
int disable_sourceid_checking;
int no_x2apic_optout;
static int disable_irq_remap;
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 set_irq_remapping_broken(void)
{
irq_remap_broken = 1;
}
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();
}
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->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->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 (irq_remapped(cfg) && remap_ops->free_irq)
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->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->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->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->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;
}