--- /dev/null
+#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;
+}
Code Review / kvmfornfv.git / blobdiff