394 lines
8.6 KiB
C
394 lines
8.6 KiB
C
#include <linux/seq_file.h>
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#include <linux/cpumask.h>
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#include <linux/kernel.h>
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#include <linux/string.h>
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#include <linux/errno.h>
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#include <linux/msi.h>
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#include <linux/irq.h>
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#include <linux/pci.h>
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#include <asm/hw_irq.h>
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#include <asm/irq_remapping.h>
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#include <asm/processor.h>
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#include <asm/x86_init.h>
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#include <asm/apic.h>
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#include "irq_remapping.h"
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int irq_remapping_enabled;
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int disable_irq_remap;
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int irq_remap_broken;
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int disable_sourceid_checking;
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int no_x2apic_optout;
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static struct irq_remap_ops *remap_ops;
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static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec);
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static int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq,
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int index, int sub_handle);
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static int set_remapped_irq_affinity(struct irq_data *data,
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const struct cpumask *mask,
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bool force);
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static bool irq_remapped(struct irq_cfg *cfg)
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{
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return (cfg->remapped == 1);
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}
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static void irq_remapping_disable_io_apic(void)
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{
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/*
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* With interrupt-remapping, for now we will use virtual wire A
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* mode, as virtual wire B is little complex (need to configure
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* both IOAPIC RTE as well as interrupt-remapping table entry).
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* As this gets called during crash dump, keep this simple for
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* now.
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*/
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if (cpu_has_apic || apic_from_smp_config())
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disconnect_bsp_APIC(0);
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}
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static int do_setup_msi_irqs(struct pci_dev *dev, int nvec)
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{
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int node, ret, sub_handle, nvec_pow2, index = 0;
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unsigned int irq;
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struct msi_desc *msidesc;
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WARN_ON(!list_is_singular(&dev->msi_list));
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msidesc = list_entry(dev->msi_list.next, struct msi_desc, list);
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WARN_ON(msidesc->irq);
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WARN_ON(msidesc->msi_attrib.multiple);
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WARN_ON(msidesc->nvec_used);
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node = dev_to_node(&dev->dev);
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irq = __create_irqs(get_nr_irqs_gsi(), nvec, node);
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if (irq == 0)
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return -ENOSPC;
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nvec_pow2 = __roundup_pow_of_two(nvec);
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msidesc->nvec_used = nvec;
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msidesc->msi_attrib.multiple = ilog2(nvec_pow2);
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for (sub_handle = 0; sub_handle < nvec; sub_handle++) {
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if (!sub_handle) {
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index = msi_alloc_remapped_irq(dev, irq, nvec_pow2);
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if (index < 0) {
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ret = index;
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goto error;
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}
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} else {
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ret = msi_setup_remapped_irq(dev, irq + sub_handle,
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index, sub_handle);
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if (ret < 0)
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goto error;
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}
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ret = setup_msi_irq(dev, msidesc, irq, sub_handle);
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if (ret < 0)
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goto error;
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}
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return 0;
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error:
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destroy_irqs(irq, nvec);
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/*
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* Restore altered MSI descriptor fields and prevent just destroyed
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* IRQs from tearing down again in default_teardown_msi_irqs()
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*/
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msidesc->irq = 0;
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msidesc->nvec_used = 0;
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msidesc->msi_attrib.multiple = 0;
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return ret;
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}
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static int do_setup_msix_irqs(struct pci_dev *dev, int nvec)
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{
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int node, ret, sub_handle, index = 0;
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struct msi_desc *msidesc;
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unsigned int irq;
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node = dev_to_node(&dev->dev);
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irq = get_nr_irqs_gsi();
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sub_handle = 0;
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list_for_each_entry(msidesc, &dev->msi_list, list) {
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irq = create_irq_nr(irq, node);
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if (irq == 0)
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return -1;
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if (sub_handle == 0)
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ret = index = msi_alloc_remapped_irq(dev, irq, nvec);
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else
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ret = msi_setup_remapped_irq(dev, irq, index, sub_handle);
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if (ret < 0)
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goto error;
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ret = setup_msi_irq(dev, msidesc, irq, 0);
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if (ret < 0)
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goto error;
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sub_handle += 1;
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irq += 1;
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}
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return 0;
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error:
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destroy_irq(irq);
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return ret;
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}
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static int irq_remapping_setup_msi_irqs(struct pci_dev *dev,
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int nvec, int type)
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{
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if (type == PCI_CAP_ID_MSI)
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return do_setup_msi_irqs(dev, nvec);
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else
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return do_setup_msix_irqs(dev, nvec);
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}
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void eoi_ioapic_pin_remapped(int apic, int pin, int vector)
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{
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/*
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* Intr-remapping uses pin number as the virtual vector
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* in the RTE. Actual vector is programmed in
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* intr-remapping table entry. Hence for the io-apic
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* EOI we use the pin number.
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*/
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io_apic_eoi(apic, pin);
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}
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static void __init irq_remapping_modify_x86_ops(void)
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{
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x86_io_apic_ops.disable = irq_remapping_disable_io_apic;
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x86_io_apic_ops.set_affinity = set_remapped_irq_affinity;
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x86_io_apic_ops.setup_entry = setup_ioapic_remapped_entry;
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x86_io_apic_ops.eoi_ioapic_pin = eoi_ioapic_pin_remapped;
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x86_msi.setup_msi_irqs = irq_remapping_setup_msi_irqs;
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x86_msi.setup_hpet_msi = setup_hpet_msi_remapped;
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x86_msi.compose_msi_msg = compose_remapped_msi_msg;
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}
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static __init int setup_nointremap(char *str)
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{
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disable_irq_remap = 1;
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return 0;
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}
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early_param("nointremap", setup_nointremap);
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static __init int setup_irqremap(char *str)
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{
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if (!str)
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return -EINVAL;
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while (*str) {
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if (!strncmp(str, "on", 2))
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disable_irq_remap = 0;
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else if (!strncmp(str, "off", 3))
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disable_irq_remap = 1;
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else if (!strncmp(str, "nosid", 5))
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disable_sourceid_checking = 1;
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else if (!strncmp(str, "no_x2apic_optout", 16))
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no_x2apic_optout = 1;
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str += strcspn(str, ",");
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while (*str == ',')
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str++;
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}
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return 0;
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}
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early_param("intremap", setup_irqremap);
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void __init setup_irq_remapping_ops(void)
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{
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remap_ops = &intel_irq_remap_ops;
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#ifdef CONFIG_AMD_IOMMU
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if (amd_iommu_irq_ops.prepare() == 0)
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remap_ops = &amd_iommu_irq_ops;
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#endif
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}
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void set_irq_remapping_broken(void)
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{
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irq_remap_broken = 1;
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}
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int irq_remapping_supported(void)
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{
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if (disable_irq_remap)
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return 0;
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if (!remap_ops || !remap_ops->supported)
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return 0;
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return remap_ops->supported();
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}
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int __init irq_remapping_prepare(void)
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{
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if (!remap_ops || !remap_ops->prepare)
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return -ENODEV;
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return remap_ops->prepare();
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}
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int __init irq_remapping_enable(void)
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{
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int ret;
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if (!remap_ops || !remap_ops->enable)
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return -ENODEV;
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ret = remap_ops->enable();
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if (irq_remapping_enabled)
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irq_remapping_modify_x86_ops();
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return ret;
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}
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void irq_remapping_disable(void)
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{
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if (!irq_remapping_enabled ||
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!remap_ops ||
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!remap_ops->disable)
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return;
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remap_ops->disable();
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}
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int irq_remapping_reenable(int mode)
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{
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if (!irq_remapping_enabled ||
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!remap_ops ||
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!remap_ops->reenable)
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return 0;
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return remap_ops->reenable(mode);
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}
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int __init irq_remap_enable_fault_handling(void)
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{
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if (!irq_remapping_enabled)
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return 0;
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if (!remap_ops || !remap_ops->enable_faulting)
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return -ENODEV;
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return remap_ops->enable_faulting();
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}
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int setup_ioapic_remapped_entry(int irq,
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struct IO_APIC_route_entry *entry,
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unsigned int destination, int vector,
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struct io_apic_irq_attr *attr)
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{
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if (!remap_ops || !remap_ops->setup_ioapic_entry)
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return -ENODEV;
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return remap_ops->setup_ioapic_entry(irq, entry, destination,
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vector, attr);
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}
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int set_remapped_irq_affinity(struct irq_data *data, const struct cpumask *mask,
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bool force)
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{
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if (!config_enabled(CONFIG_SMP) || !remap_ops ||
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!remap_ops->set_affinity)
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return 0;
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return remap_ops->set_affinity(data, mask, force);
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}
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void free_remapped_irq(int irq)
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{
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struct irq_cfg *cfg = irq_get_chip_data(irq);
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if (!remap_ops || !remap_ops->free_irq)
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return;
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if (irq_remapped(cfg))
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remap_ops->free_irq(irq);
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}
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void compose_remapped_msi_msg(struct pci_dev *pdev,
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unsigned int irq, unsigned int dest,
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struct msi_msg *msg, u8 hpet_id)
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{
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struct irq_cfg *cfg = irq_get_chip_data(irq);
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if (!irq_remapped(cfg))
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native_compose_msi_msg(pdev, irq, dest, msg, hpet_id);
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else if (remap_ops && remap_ops->compose_msi_msg)
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remap_ops->compose_msi_msg(pdev, irq, dest, msg, hpet_id);
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}
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static int msi_alloc_remapped_irq(struct pci_dev *pdev, int irq, int nvec)
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{
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if (!remap_ops || !remap_ops->msi_alloc_irq)
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return -ENODEV;
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return remap_ops->msi_alloc_irq(pdev, irq, nvec);
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}
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static int msi_setup_remapped_irq(struct pci_dev *pdev, unsigned int irq,
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int index, int sub_handle)
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{
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if (!remap_ops || !remap_ops->msi_setup_irq)
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return -ENODEV;
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return remap_ops->msi_setup_irq(pdev, irq, index, sub_handle);
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}
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int setup_hpet_msi_remapped(unsigned int irq, unsigned int id)
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{
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if (!remap_ops || !remap_ops->setup_hpet_msi)
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return -ENODEV;
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return remap_ops->setup_hpet_msi(irq, id);
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}
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void panic_if_irq_remap(const char *msg)
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{
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if (irq_remapping_enabled)
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panic(msg);
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}
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static void ir_ack_apic_edge(struct irq_data *data)
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{
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ack_APIC_irq();
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}
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static void ir_ack_apic_level(struct irq_data *data)
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{
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ack_APIC_irq();
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eoi_ioapic_irq(data->irq, data->chip_data);
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}
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static void ir_print_prefix(struct irq_data *data, struct seq_file *p)
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{
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seq_printf(p, " IR-%s", data->chip->name);
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}
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void irq_remap_modify_chip_defaults(struct irq_chip *chip)
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{
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chip->irq_print_chip = ir_print_prefix;
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chip->irq_ack = ir_ack_apic_edge;
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chip->irq_eoi = ir_ack_apic_level;
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chip->irq_set_affinity = x86_io_apic_ops.set_affinity;
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}
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bool setup_remapped_irq(int irq, struct irq_cfg *cfg, struct irq_chip *chip)
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{
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if (!irq_remapped(cfg))
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return false;
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irq_set_status_flags(irq, IRQ_MOVE_PCNTXT);
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irq_remap_modify_chip_defaults(chip);
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return true;
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}
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