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3cfef95246
* 'core-locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (27 commits)
rtmutex: Add missing rcu_read_unlock() in debug_rt_mutex_print_deadlock()
lockdep: Comment all warnings
lib: atomic64: Change the type of local lock to raw_spinlock_t
locking, lib/atomic64: Annotate atomic64_lock::lock as raw
locking, x86, iommu: Annotate qi->q_lock as raw
locking, x86, iommu: Annotate irq_2_ir_lock as raw
locking, x86, iommu: Annotate iommu->register_lock as raw
locking, dma, ipu: Annotate bank_lock as raw
locking, ARM: Annotate low level hw locks as raw
locking, drivers/dca: Annotate dca_lock as raw
locking, powerpc: Annotate uic->lock as raw
locking, x86: mce: Annotate cmci_discover_lock as raw
locking, ACPI: Annotate c3_lock as raw
locking, oprofile: Annotate oprofilefs lock as raw
locking, video: Annotate vga console lock as raw
locking, latencytop: Annotate latency_lock as raw
locking, timer_stats: Annotate table_lock as raw
locking, rwsem: Annotate inner lock as raw
locking, semaphores: Annotate inner lock as raw
locking, sched: Annotate thread_group_cputimer as raw
...
Fix up conflicts in kernel/posix-cpu-timers.c manually: making
cputimer->cputime a raw lock conflicted with the ABBA fix in commit
bcd5cff721
("cputimer: Cure lock inversion").
835 lines
18 KiB
C
835 lines
18 KiB
C
#include <linux/interrupt.h>
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#include <linux/dmar.h>
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#include <linux/spinlock.h>
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#include <linux/slab.h>
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#include <linux/jiffies.h>
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#include <linux/hpet.h>
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#include <linux/pci.h>
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#include <linux/irq.h>
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#include <asm/io_apic.h>
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#include <asm/smp.h>
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#include <asm/cpu.h>
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#include <linux/intel-iommu.h>
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#include "intr_remapping.h"
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#include <acpi/acpi.h>
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#include <asm/pci-direct.h>
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static struct ioapic_scope ir_ioapic[MAX_IO_APICS];
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static struct hpet_scope ir_hpet[MAX_HPET_TBS];
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static int ir_ioapic_num, ir_hpet_num;
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int intr_remapping_enabled;
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static int disable_intremap;
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static int disable_sourceid_checking;
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static int no_x2apic_optout;
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static __init int setup_nointremap(char *str)
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{
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disable_intremap = 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_intremap(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_intremap = 0;
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else if (!strncmp(str, "off", 3))
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disable_intremap = 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_intremap);
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static DEFINE_RAW_SPINLOCK(irq_2_ir_lock);
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static struct irq_2_iommu *irq_2_iommu(unsigned int irq)
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{
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struct irq_cfg *cfg = irq_get_chip_data(irq);
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return cfg ? &cfg->irq_2_iommu : NULL;
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}
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int get_irte(int irq, struct irte *entry)
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{
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struct irq_2_iommu *irq_iommu = irq_2_iommu(irq);
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unsigned long flags;
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int index;
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if (!entry || !irq_iommu)
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return -1;
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raw_spin_lock_irqsave(&irq_2_ir_lock, flags);
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index = irq_iommu->irte_index + irq_iommu->sub_handle;
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*entry = *(irq_iommu->iommu->ir_table->base + index);
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raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags);
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return 0;
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}
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int alloc_irte(struct intel_iommu *iommu, int irq, u16 count)
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{
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struct ir_table *table = iommu->ir_table;
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struct irq_2_iommu *irq_iommu = irq_2_iommu(irq);
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u16 index, start_index;
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unsigned int mask = 0;
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unsigned long flags;
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int i;
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if (!count || !irq_iommu)
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return -1;
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/*
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* start the IRTE search from index 0.
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*/
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index = start_index = 0;
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if (count > 1) {
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count = __roundup_pow_of_two(count);
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mask = ilog2(count);
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}
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if (mask > ecap_max_handle_mask(iommu->ecap)) {
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printk(KERN_ERR
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"Requested mask %x exceeds the max invalidation handle"
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" mask value %Lx\n", mask,
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ecap_max_handle_mask(iommu->ecap));
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return -1;
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}
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raw_spin_lock_irqsave(&irq_2_ir_lock, flags);
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do {
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for (i = index; i < index + count; i++)
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if (table->base[i].present)
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break;
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/* empty index found */
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if (i == index + count)
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break;
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index = (index + count) % INTR_REMAP_TABLE_ENTRIES;
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if (index == start_index) {
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raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags);
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printk(KERN_ERR "can't allocate an IRTE\n");
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return -1;
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}
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} while (1);
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for (i = index; i < index + count; i++)
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table->base[i].present = 1;
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irq_iommu->iommu = iommu;
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irq_iommu->irte_index = index;
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irq_iommu->sub_handle = 0;
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irq_iommu->irte_mask = mask;
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raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags);
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return index;
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}
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static int qi_flush_iec(struct intel_iommu *iommu, int index, int mask)
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{
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struct qi_desc desc;
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desc.low = QI_IEC_IIDEX(index) | QI_IEC_TYPE | QI_IEC_IM(mask)
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| QI_IEC_SELECTIVE;
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desc.high = 0;
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return qi_submit_sync(&desc, iommu);
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}
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int map_irq_to_irte_handle(int irq, u16 *sub_handle)
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{
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struct irq_2_iommu *irq_iommu = irq_2_iommu(irq);
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unsigned long flags;
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int index;
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if (!irq_iommu)
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return -1;
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raw_spin_lock_irqsave(&irq_2_ir_lock, flags);
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*sub_handle = irq_iommu->sub_handle;
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index = irq_iommu->irte_index;
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raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags);
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return index;
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}
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int set_irte_irq(int irq, struct intel_iommu *iommu, u16 index, u16 subhandle)
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{
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struct irq_2_iommu *irq_iommu = irq_2_iommu(irq);
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unsigned long flags;
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if (!irq_iommu)
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return -1;
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raw_spin_lock_irqsave(&irq_2_ir_lock, flags);
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irq_iommu->iommu = iommu;
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irq_iommu->irte_index = index;
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irq_iommu->sub_handle = subhandle;
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irq_iommu->irte_mask = 0;
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raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags);
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return 0;
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}
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int modify_irte(int irq, struct irte *irte_modified)
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{
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struct irq_2_iommu *irq_iommu = irq_2_iommu(irq);
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struct intel_iommu *iommu;
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unsigned long flags;
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struct irte *irte;
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int rc, index;
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if (!irq_iommu)
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return -1;
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raw_spin_lock_irqsave(&irq_2_ir_lock, flags);
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iommu = irq_iommu->iommu;
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index = irq_iommu->irte_index + irq_iommu->sub_handle;
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irte = &iommu->ir_table->base[index];
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set_64bit(&irte->low, irte_modified->low);
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set_64bit(&irte->high, irte_modified->high);
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__iommu_flush_cache(iommu, irte, sizeof(*irte));
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rc = qi_flush_iec(iommu, index, 0);
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raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags);
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return rc;
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}
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struct intel_iommu *map_hpet_to_ir(u8 hpet_id)
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{
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int i;
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for (i = 0; i < MAX_HPET_TBS; i++)
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if (ir_hpet[i].id == hpet_id)
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return ir_hpet[i].iommu;
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return NULL;
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}
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struct intel_iommu *map_ioapic_to_ir(int apic)
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{
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int i;
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for (i = 0; i < MAX_IO_APICS; i++)
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if (ir_ioapic[i].id == apic)
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return ir_ioapic[i].iommu;
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return NULL;
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}
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struct intel_iommu *map_dev_to_ir(struct pci_dev *dev)
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{
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struct dmar_drhd_unit *drhd;
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drhd = dmar_find_matched_drhd_unit(dev);
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if (!drhd)
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return NULL;
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return drhd->iommu;
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}
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static int clear_entries(struct irq_2_iommu *irq_iommu)
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{
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struct irte *start, *entry, *end;
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struct intel_iommu *iommu;
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int index;
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if (irq_iommu->sub_handle)
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return 0;
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iommu = irq_iommu->iommu;
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index = irq_iommu->irte_index + irq_iommu->sub_handle;
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start = iommu->ir_table->base + index;
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end = start + (1 << irq_iommu->irte_mask);
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for (entry = start; entry < end; entry++) {
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set_64bit(&entry->low, 0);
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set_64bit(&entry->high, 0);
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}
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return qi_flush_iec(iommu, index, irq_iommu->irte_mask);
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}
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int free_irte(int irq)
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{
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struct irq_2_iommu *irq_iommu = irq_2_iommu(irq);
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unsigned long flags;
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int rc;
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if (!irq_iommu)
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return -1;
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raw_spin_lock_irqsave(&irq_2_ir_lock, flags);
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rc = clear_entries(irq_iommu);
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irq_iommu->iommu = NULL;
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irq_iommu->irte_index = 0;
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irq_iommu->sub_handle = 0;
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irq_iommu->irte_mask = 0;
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raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags);
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return rc;
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}
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/*
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* source validation type
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*/
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#define SVT_NO_VERIFY 0x0 /* no verification is required */
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#define SVT_VERIFY_SID_SQ 0x1 /* verify using SID and SQ fields */
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#define SVT_VERIFY_BUS 0x2 /* verify bus of request-id */
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/*
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* source-id qualifier
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*/
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#define SQ_ALL_16 0x0 /* verify all 16 bits of request-id */
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#define SQ_13_IGNORE_1 0x1 /* verify most significant 13 bits, ignore
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* the third least significant bit
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*/
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#define SQ_13_IGNORE_2 0x2 /* verify most significant 13 bits, ignore
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* the second and third least significant bits
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*/
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#define SQ_13_IGNORE_3 0x3 /* verify most significant 13 bits, ignore
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* the least three significant bits
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*/
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/*
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* set SVT, SQ and SID fields of irte to verify
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* source ids of interrupt requests
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*/
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static void set_irte_sid(struct irte *irte, unsigned int svt,
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unsigned int sq, unsigned int sid)
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{
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if (disable_sourceid_checking)
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svt = SVT_NO_VERIFY;
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irte->svt = svt;
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irte->sq = sq;
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irte->sid = sid;
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}
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int set_ioapic_sid(struct irte *irte, int apic)
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{
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int i;
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u16 sid = 0;
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if (!irte)
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return -1;
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for (i = 0; i < MAX_IO_APICS; i++) {
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if (ir_ioapic[i].id == apic) {
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sid = (ir_ioapic[i].bus << 8) | ir_ioapic[i].devfn;
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break;
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}
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}
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if (sid == 0) {
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pr_warning("Failed to set source-id of IOAPIC (%d)\n", apic);
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return -1;
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}
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set_irte_sid(irte, 1, 0, sid);
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return 0;
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}
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int set_hpet_sid(struct irte *irte, u8 id)
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{
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int i;
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u16 sid = 0;
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if (!irte)
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return -1;
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for (i = 0; i < MAX_HPET_TBS; i++) {
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if (ir_hpet[i].id == id) {
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sid = (ir_hpet[i].bus << 8) | ir_hpet[i].devfn;
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break;
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}
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}
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if (sid == 0) {
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pr_warning("Failed to set source-id of HPET block (%d)\n", id);
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return -1;
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}
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/*
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* Should really use SQ_ALL_16. Some platforms are broken.
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* While we figure out the right quirks for these broken platforms, use
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* SQ_13_IGNORE_3 for now.
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*/
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set_irte_sid(irte, SVT_VERIFY_SID_SQ, SQ_13_IGNORE_3, sid);
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return 0;
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}
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int set_msi_sid(struct irte *irte, struct pci_dev *dev)
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{
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struct pci_dev *bridge;
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if (!irte || !dev)
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return -1;
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/* PCIe device or Root Complex integrated PCI device */
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if (pci_is_pcie(dev) || !dev->bus->parent) {
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set_irte_sid(irte, SVT_VERIFY_SID_SQ, SQ_ALL_16,
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(dev->bus->number << 8) | dev->devfn);
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return 0;
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}
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bridge = pci_find_upstream_pcie_bridge(dev);
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if (bridge) {
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if (pci_is_pcie(bridge))/* this is a PCIe-to-PCI/PCIX bridge */
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set_irte_sid(irte, SVT_VERIFY_BUS, SQ_ALL_16,
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(bridge->bus->number << 8) | dev->bus->number);
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else /* this is a legacy PCI bridge */
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set_irte_sid(irte, SVT_VERIFY_SID_SQ, SQ_ALL_16,
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(bridge->bus->number << 8) | bridge->devfn);
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}
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return 0;
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}
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static void iommu_set_intr_remapping(struct intel_iommu *iommu, int mode)
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{
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u64 addr;
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u32 sts;
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unsigned long flags;
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addr = virt_to_phys((void *)iommu->ir_table->base);
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raw_spin_lock_irqsave(&iommu->register_lock, flags);
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dmar_writeq(iommu->reg + DMAR_IRTA_REG,
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(addr) | IR_X2APIC_MODE(mode) | INTR_REMAP_TABLE_REG_SIZE);
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/* Set interrupt-remapping table pointer */
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iommu->gcmd |= DMA_GCMD_SIRTP;
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writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
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IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
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readl, (sts & DMA_GSTS_IRTPS), sts);
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raw_spin_unlock_irqrestore(&iommu->register_lock, flags);
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/*
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* global invalidation of interrupt entry cache before enabling
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* interrupt-remapping.
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*/
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qi_global_iec(iommu);
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raw_spin_lock_irqsave(&iommu->register_lock, flags);
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/* Enable interrupt-remapping */
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iommu->gcmd |= DMA_GCMD_IRE;
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writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
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IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
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readl, (sts & DMA_GSTS_IRES), sts);
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raw_spin_unlock_irqrestore(&iommu->register_lock, flags);
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}
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static int setup_intr_remapping(struct intel_iommu *iommu, int mode)
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{
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struct ir_table *ir_table;
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struct page *pages;
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ir_table = iommu->ir_table = kzalloc(sizeof(struct ir_table),
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GFP_ATOMIC);
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if (!iommu->ir_table)
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return -ENOMEM;
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pages = alloc_pages_node(iommu->node, GFP_ATOMIC | __GFP_ZERO,
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INTR_REMAP_PAGE_ORDER);
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if (!pages) {
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printk(KERN_ERR "failed to allocate pages of order %d\n",
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INTR_REMAP_PAGE_ORDER);
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kfree(iommu->ir_table);
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return -ENOMEM;
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}
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ir_table->base = page_address(pages);
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iommu_set_intr_remapping(iommu, mode);
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return 0;
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}
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/*
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* Disable Interrupt Remapping.
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*/
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static void iommu_disable_intr_remapping(struct intel_iommu *iommu)
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{
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unsigned long flags;
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u32 sts;
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if (!ecap_ir_support(iommu->ecap))
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return;
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/*
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* global invalidation of interrupt entry cache before disabling
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* interrupt-remapping.
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*/
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qi_global_iec(iommu);
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|
|
raw_spin_lock_irqsave(&iommu->register_lock, flags);
|
|
|
|
sts = dmar_readq(iommu->reg + DMAR_GSTS_REG);
|
|
if (!(sts & DMA_GSTS_IRES))
|
|
goto end;
|
|
|
|
iommu->gcmd &= ~DMA_GCMD_IRE;
|
|
writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
|
|
|
|
IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
|
|
readl, !(sts & DMA_GSTS_IRES), sts);
|
|
|
|
end:
|
|
raw_spin_unlock_irqrestore(&iommu->register_lock, flags);
|
|
}
|
|
|
|
static int __init dmar_x2apic_optout(void)
|
|
{
|
|
struct acpi_table_dmar *dmar;
|
|
dmar = (struct acpi_table_dmar *)dmar_tbl;
|
|
if (!dmar || no_x2apic_optout)
|
|
return 0;
|
|
return dmar->flags & DMAR_X2APIC_OPT_OUT;
|
|
}
|
|
|
|
int __init intr_remapping_supported(void)
|
|
{
|
|
struct dmar_drhd_unit *drhd;
|
|
|
|
if (disable_intremap)
|
|
return 0;
|
|
|
|
if (!dmar_ir_support())
|
|
return 0;
|
|
|
|
for_each_drhd_unit(drhd) {
|
|
struct intel_iommu *iommu = drhd->iommu;
|
|
|
|
if (!ecap_ir_support(iommu->ecap))
|
|
return 0;
|
|
}
|
|
|
|
return 1;
|
|
}
|
|
|
|
int __init enable_intr_remapping(void)
|
|
{
|
|
struct dmar_drhd_unit *drhd;
|
|
int setup = 0;
|
|
int eim = 0;
|
|
|
|
if (parse_ioapics_under_ir() != 1) {
|
|
printk(KERN_INFO "Not enable interrupt remapping\n");
|
|
return -1;
|
|
}
|
|
|
|
if (x2apic_supported()) {
|
|
eim = !dmar_x2apic_optout();
|
|
WARN(!eim, KERN_WARNING
|
|
"Your BIOS is broken and requested that x2apic be disabled\n"
|
|
"This will leave your machine vulnerable to irq-injection attacks\n"
|
|
"Use 'intremap=no_x2apic_optout' to override BIOS request\n");
|
|
}
|
|
|
|
for_each_drhd_unit(drhd) {
|
|
struct intel_iommu *iommu = drhd->iommu;
|
|
|
|
/*
|
|
* If the queued invalidation is already initialized,
|
|
* shouldn't disable it.
|
|
*/
|
|
if (iommu->qi)
|
|
continue;
|
|
|
|
/*
|
|
* Clear previous faults.
|
|
*/
|
|
dmar_fault(-1, iommu);
|
|
|
|
/*
|
|
* Disable intr remapping and queued invalidation, if already
|
|
* enabled prior to OS handover.
|
|
*/
|
|
iommu_disable_intr_remapping(iommu);
|
|
|
|
dmar_disable_qi(iommu);
|
|
}
|
|
|
|
/*
|
|
* check for the Interrupt-remapping support
|
|
*/
|
|
for_each_drhd_unit(drhd) {
|
|
struct intel_iommu *iommu = drhd->iommu;
|
|
|
|
if (!ecap_ir_support(iommu->ecap))
|
|
continue;
|
|
|
|
if (eim && !ecap_eim_support(iommu->ecap)) {
|
|
printk(KERN_INFO "DRHD %Lx: EIM not supported by DRHD, "
|
|
" ecap %Lx\n", drhd->reg_base_addr, iommu->ecap);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Enable queued invalidation for all the DRHD's.
|
|
*/
|
|
for_each_drhd_unit(drhd) {
|
|
int ret;
|
|
struct intel_iommu *iommu = drhd->iommu;
|
|
ret = dmar_enable_qi(iommu);
|
|
|
|
if (ret) {
|
|
printk(KERN_ERR "DRHD %Lx: failed to enable queued, "
|
|
" invalidation, ecap %Lx, ret %d\n",
|
|
drhd->reg_base_addr, iommu->ecap, ret);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Setup Interrupt-remapping for all the DRHD's now.
|
|
*/
|
|
for_each_drhd_unit(drhd) {
|
|
struct intel_iommu *iommu = drhd->iommu;
|
|
|
|
if (!ecap_ir_support(iommu->ecap))
|
|
continue;
|
|
|
|
if (setup_intr_remapping(iommu, eim))
|
|
goto error;
|
|
|
|
setup = 1;
|
|
}
|
|
|
|
if (!setup)
|
|
goto error;
|
|
|
|
intr_remapping_enabled = 1;
|
|
pr_info("Enabled IRQ remapping in %s mode\n", eim ? "x2apic" : "xapic");
|
|
|
|
return eim ? IRQ_REMAP_X2APIC_MODE : IRQ_REMAP_XAPIC_MODE;
|
|
|
|
error:
|
|
/*
|
|
* handle error condition gracefully here!
|
|
*/
|
|
return -1;
|
|
}
|
|
|
|
static void ir_parse_one_hpet_scope(struct acpi_dmar_device_scope *scope,
|
|
struct intel_iommu *iommu)
|
|
{
|
|
struct acpi_dmar_pci_path *path;
|
|
u8 bus;
|
|
int count;
|
|
|
|
bus = scope->bus;
|
|
path = (struct acpi_dmar_pci_path *)(scope + 1);
|
|
count = (scope->length - sizeof(struct acpi_dmar_device_scope))
|
|
/ sizeof(struct acpi_dmar_pci_path);
|
|
|
|
while (--count > 0) {
|
|
/*
|
|
* Access PCI directly due to the PCI
|
|
* subsystem isn't initialized yet.
|
|
*/
|
|
bus = read_pci_config_byte(bus, path->dev, path->fn,
|
|
PCI_SECONDARY_BUS);
|
|
path++;
|
|
}
|
|
ir_hpet[ir_hpet_num].bus = bus;
|
|
ir_hpet[ir_hpet_num].devfn = PCI_DEVFN(path->dev, path->fn);
|
|
ir_hpet[ir_hpet_num].iommu = iommu;
|
|
ir_hpet[ir_hpet_num].id = scope->enumeration_id;
|
|
ir_hpet_num++;
|
|
}
|
|
|
|
static void ir_parse_one_ioapic_scope(struct acpi_dmar_device_scope *scope,
|
|
struct intel_iommu *iommu)
|
|
{
|
|
struct acpi_dmar_pci_path *path;
|
|
u8 bus;
|
|
int count;
|
|
|
|
bus = scope->bus;
|
|
path = (struct acpi_dmar_pci_path *)(scope + 1);
|
|
count = (scope->length - sizeof(struct acpi_dmar_device_scope))
|
|
/ sizeof(struct acpi_dmar_pci_path);
|
|
|
|
while (--count > 0) {
|
|
/*
|
|
* Access PCI directly due to the PCI
|
|
* subsystem isn't initialized yet.
|
|
*/
|
|
bus = read_pci_config_byte(bus, path->dev, path->fn,
|
|
PCI_SECONDARY_BUS);
|
|
path++;
|
|
}
|
|
|
|
ir_ioapic[ir_ioapic_num].bus = bus;
|
|
ir_ioapic[ir_ioapic_num].devfn = PCI_DEVFN(path->dev, path->fn);
|
|
ir_ioapic[ir_ioapic_num].iommu = iommu;
|
|
ir_ioapic[ir_ioapic_num].id = scope->enumeration_id;
|
|
ir_ioapic_num++;
|
|
}
|
|
|
|
static int ir_parse_ioapic_hpet_scope(struct acpi_dmar_header *header,
|
|
struct intel_iommu *iommu)
|
|
{
|
|
struct acpi_dmar_hardware_unit *drhd;
|
|
struct acpi_dmar_device_scope *scope;
|
|
void *start, *end;
|
|
|
|
drhd = (struct acpi_dmar_hardware_unit *)header;
|
|
|
|
start = (void *)(drhd + 1);
|
|
end = ((void *)drhd) + header->length;
|
|
|
|
while (start < end) {
|
|
scope = start;
|
|
if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_IOAPIC) {
|
|
if (ir_ioapic_num == MAX_IO_APICS) {
|
|
printk(KERN_WARNING "Exceeded Max IO APICS\n");
|
|
return -1;
|
|
}
|
|
|
|
printk(KERN_INFO "IOAPIC id %d under DRHD base "
|
|
" 0x%Lx IOMMU %d\n", scope->enumeration_id,
|
|
drhd->address, iommu->seq_id);
|
|
|
|
ir_parse_one_ioapic_scope(scope, iommu);
|
|
} else if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_HPET) {
|
|
if (ir_hpet_num == MAX_HPET_TBS) {
|
|
printk(KERN_WARNING "Exceeded Max HPET blocks\n");
|
|
return -1;
|
|
}
|
|
|
|
printk(KERN_INFO "HPET id %d under DRHD base"
|
|
" 0x%Lx\n", scope->enumeration_id,
|
|
drhd->address);
|
|
|
|
ir_parse_one_hpet_scope(scope, iommu);
|
|
}
|
|
start += scope->length;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* Finds the assocaition between IOAPIC's and its Interrupt-remapping
|
|
* hardware unit.
|
|
*/
|
|
int __init parse_ioapics_under_ir(void)
|
|
{
|
|
struct dmar_drhd_unit *drhd;
|
|
int ir_supported = 0;
|
|
|
|
for_each_drhd_unit(drhd) {
|
|
struct intel_iommu *iommu = drhd->iommu;
|
|
|
|
if (ecap_ir_support(iommu->ecap)) {
|
|
if (ir_parse_ioapic_hpet_scope(drhd->hdr, iommu))
|
|
return -1;
|
|
|
|
ir_supported = 1;
|
|
}
|
|
}
|
|
|
|
if (ir_supported && ir_ioapic_num != nr_ioapics) {
|
|
printk(KERN_WARNING
|
|
"Not all IO-APIC's listed under remapping hardware\n");
|
|
return -1;
|
|
}
|
|
|
|
return ir_supported;
|
|
}
|
|
|
|
int ir_dev_scope_init(void)
|
|
{
|
|
if (!intr_remapping_enabled)
|
|
return 0;
|
|
|
|
return dmar_dev_scope_init();
|
|
}
|
|
rootfs_initcall(ir_dev_scope_init);
|
|
|
|
void disable_intr_remapping(void)
|
|
{
|
|
struct dmar_drhd_unit *drhd;
|
|
struct intel_iommu *iommu = NULL;
|
|
|
|
/*
|
|
* Disable Interrupt-remapping for all the DRHD's now.
|
|
*/
|
|
for_each_iommu(iommu, drhd) {
|
|
if (!ecap_ir_support(iommu->ecap))
|
|
continue;
|
|
|
|
iommu_disable_intr_remapping(iommu);
|
|
}
|
|
}
|
|
|
|
int reenable_intr_remapping(int eim)
|
|
{
|
|
struct dmar_drhd_unit *drhd;
|
|
int setup = 0;
|
|
struct intel_iommu *iommu = NULL;
|
|
|
|
for_each_iommu(iommu, drhd)
|
|
if (iommu->qi)
|
|
dmar_reenable_qi(iommu);
|
|
|
|
/*
|
|
* Setup Interrupt-remapping for all the DRHD's now.
|
|
*/
|
|
for_each_iommu(iommu, drhd) {
|
|
if (!ecap_ir_support(iommu->ecap))
|
|
continue;
|
|
|
|
/* Set up interrupt remapping for iommu.*/
|
|
iommu_set_intr_remapping(iommu, eim);
|
|
setup = 1;
|
|
}
|
|
|
|
if (!setup)
|
|
goto error;
|
|
|
|
return 0;
|
|
|
|
error:
|
|
/*
|
|
* handle error condition gracefully here!
|
|
*/
|
|
return -1;
|
|
}
|
|
|