1 // SPDX-License-Identifier: GPL-2.0
3 #define pr_fmt(fmt) "DMAR-IR: " fmt
5 #include <linux/interrupt.h>
6 #include <linux/dmar.h>
7 #include <linux/spinlock.h>
8 #include <linux/slab.h>
9 #include <linux/jiffies.h>
10 #include <linux/hpet.h>
11 #include <linux/pci.h>
12 #include <linux/irq.h>
13 #include <linux/intel-iommu.h>
14 #include <linux/acpi.h>
15 #include <linux/irqdomain.h>
16 #include <linux/crash_dump.h>
17 #include <asm/io_apic.h>
21 #include <asm/irq_remapping.h>
22 #include <asm/pci-direct.h>
24 #include "../irq_remapping.h"
25 #include "cap_audit.h"
33 struct intel_iommu *iommu;
35 unsigned int bus; /* PCI bus number */
36 unsigned int devfn; /* PCI devfn number */
40 struct intel_iommu *iommu;
47 struct intel_iommu *iommu;
54 struct intel_ir_data {
55 struct irq_2_iommu irq_2_iommu;
56 struct irte irte_entry;
58 struct msi_msg msi_entry;
62 #define IR_X2APIC_MODE(mode) (mode ? (1 << 11) : 0)
63 #define IRTE_DEST(dest) ((eim_mode) ? dest : dest << 8)
65 static int __read_mostly eim_mode;
66 static struct ioapic_scope ir_ioapic[MAX_IO_APICS];
67 static struct hpet_scope ir_hpet[MAX_HPET_TBS];
74 * ->iommu->register_lock
76 * intel_irq_remap_ops.{supported,prepare,enable,disable,reenable} are called
77 * in single-threaded environment with interrupt disabled, so no need to tabke
78 * the dmar_global_lock.
80 DEFINE_RAW_SPINLOCK(irq_2_ir_lock);
81 static const struct irq_domain_ops intel_ir_domain_ops;
83 static void iommu_disable_irq_remapping(struct intel_iommu *iommu);
84 static int __init parse_ioapics_under_ir(void);
86 static bool ir_pre_enabled(struct intel_iommu *iommu)
88 return (iommu->flags & VTD_FLAG_IRQ_REMAP_PRE_ENABLED);
91 static void clear_ir_pre_enabled(struct intel_iommu *iommu)
93 iommu->flags &= ~VTD_FLAG_IRQ_REMAP_PRE_ENABLED;
96 static void init_ir_status(struct intel_iommu *iommu)
100 gsts = readl(iommu->reg + DMAR_GSTS_REG);
101 if (gsts & DMA_GSTS_IRES)
102 iommu->flags |= VTD_FLAG_IRQ_REMAP_PRE_ENABLED;
105 static int alloc_irte(struct intel_iommu *iommu,
106 struct irq_2_iommu *irq_iommu, u16 count)
108 struct ir_table *table = iommu->ir_table;
109 unsigned int mask = 0;
113 if (!count || !irq_iommu)
117 count = __roundup_pow_of_two(count);
121 if (mask > ecap_max_handle_mask(iommu->ecap)) {
122 pr_err("Requested mask %x exceeds the max invalidation handle"
123 " mask value %Lx\n", mask,
124 ecap_max_handle_mask(iommu->ecap));
128 raw_spin_lock_irqsave(&irq_2_ir_lock, flags);
129 index = bitmap_find_free_region(table->bitmap,
130 INTR_REMAP_TABLE_ENTRIES, mask);
132 pr_warn("IR%d: can't allocate an IRTE\n", iommu->seq_id);
134 irq_iommu->iommu = iommu;
135 irq_iommu->irte_index = index;
136 irq_iommu->sub_handle = 0;
137 irq_iommu->irte_mask = mask;
138 irq_iommu->mode = IRQ_REMAPPING;
140 raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags);
145 static int qi_flush_iec(struct intel_iommu *iommu, int index, int mask)
149 desc.qw0 = QI_IEC_IIDEX(index) | QI_IEC_TYPE | QI_IEC_IM(mask)
155 return qi_submit_sync(iommu, &desc, 1, 0);
158 static int modify_irte(struct irq_2_iommu *irq_iommu,
159 struct irte *irte_modified)
161 struct intel_iommu *iommu;
169 raw_spin_lock_irqsave(&irq_2_ir_lock, flags);
171 iommu = irq_iommu->iommu;
173 index = irq_iommu->irte_index + irq_iommu->sub_handle;
174 irte = &iommu->ir_table->base[index];
176 #if defined(CONFIG_HAVE_CMPXCHG_DOUBLE)
177 if ((irte->pst == 1) || (irte_modified->pst == 1)) {
180 ret = cmpxchg_double(&irte->low, &irte->high,
181 irte->low, irte->high,
182 irte_modified->low, irte_modified->high);
184 * We use cmpxchg16 to atomically update the 128-bit IRTE,
185 * and it cannot be updated by the hardware or other processors
186 * behind us, so the return value of cmpxchg16 should be the
187 * same as the old value.
193 set_64bit(&irte->low, irte_modified->low);
194 set_64bit(&irte->high, irte_modified->high);
196 __iommu_flush_cache(iommu, irte, sizeof(*irte));
198 rc = qi_flush_iec(iommu, index, 0);
200 /* Update iommu mode according to the IRTE mode */
201 irq_iommu->mode = irte->pst ? IRQ_POSTING : IRQ_REMAPPING;
202 raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags);
207 static struct intel_iommu *map_hpet_to_iommu(u8 hpet_id)
211 for (i = 0; i < MAX_HPET_TBS; i++) {
212 if (ir_hpet[i].id == hpet_id && ir_hpet[i].iommu)
213 return ir_hpet[i].iommu;
218 static struct intel_iommu *map_ioapic_to_iommu(int apic)
222 for (i = 0; i < MAX_IO_APICS; i++) {
223 if (ir_ioapic[i].id == apic && ir_ioapic[i].iommu)
224 return ir_ioapic[i].iommu;
229 static struct irq_domain *map_dev_to_ir(struct pci_dev *dev)
231 struct dmar_drhd_unit *drhd = dmar_find_matched_drhd_unit(dev);
233 return drhd ? drhd->iommu->ir_msi_domain : NULL;
236 static int clear_entries(struct irq_2_iommu *irq_iommu)
238 struct irte *start, *entry, *end;
239 struct intel_iommu *iommu;
242 if (irq_iommu->sub_handle)
245 iommu = irq_iommu->iommu;
246 index = irq_iommu->irte_index;
248 start = iommu->ir_table->base + index;
249 end = start + (1 << irq_iommu->irte_mask);
251 for (entry = start; entry < end; entry++) {
252 set_64bit(&entry->low, 0);
253 set_64bit(&entry->high, 0);
255 bitmap_release_region(iommu->ir_table->bitmap, index,
256 irq_iommu->irte_mask);
258 return qi_flush_iec(iommu, index, irq_iommu->irte_mask);
262 * source validation type
264 #define SVT_NO_VERIFY 0x0 /* no verification is required */
265 #define SVT_VERIFY_SID_SQ 0x1 /* verify using SID and SQ fields */
266 #define SVT_VERIFY_BUS 0x2 /* verify bus of request-id */
269 * source-id qualifier
271 #define SQ_ALL_16 0x0 /* verify all 16 bits of request-id */
272 #define SQ_13_IGNORE_1 0x1 /* verify most significant 13 bits, ignore
273 * the third least significant bit
275 #define SQ_13_IGNORE_2 0x2 /* verify most significant 13 bits, ignore
276 * the second and third least significant bits
278 #define SQ_13_IGNORE_3 0x3 /* verify most significant 13 bits, ignore
279 * the least three significant bits
283 * set SVT, SQ and SID fields of irte to verify
284 * source ids of interrupt requests
286 static void set_irte_sid(struct irte *irte, unsigned int svt,
287 unsigned int sq, unsigned int sid)
289 if (disable_sourceid_checking)
297 * Set an IRTE to match only the bus number. Interrupt requests that reference
298 * this IRTE must have a requester-id whose bus number is between or equal
299 * to the start_bus and end_bus arguments.
301 static void set_irte_verify_bus(struct irte *irte, unsigned int start_bus,
302 unsigned int end_bus)
304 set_irte_sid(irte, SVT_VERIFY_BUS, SQ_ALL_16,
305 (start_bus << 8) | end_bus);
308 static int set_ioapic_sid(struct irte *irte, int apic)
316 down_read(&dmar_global_lock);
317 for (i = 0; i < MAX_IO_APICS; i++) {
318 if (ir_ioapic[i].iommu && ir_ioapic[i].id == apic) {
319 sid = (ir_ioapic[i].bus << 8) | ir_ioapic[i].devfn;
323 up_read(&dmar_global_lock);
326 pr_warn("Failed to set source-id of IOAPIC (%d)\n", apic);
330 set_irte_sid(irte, SVT_VERIFY_SID_SQ, SQ_ALL_16, sid);
335 static int set_hpet_sid(struct irte *irte, u8 id)
343 down_read(&dmar_global_lock);
344 for (i = 0; i < MAX_HPET_TBS; i++) {
345 if (ir_hpet[i].iommu && ir_hpet[i].id == id) {
346 sid = (ir_hpet[i].bus << 8) | ir_hpet[i].devfn;
350 up_read(&dmar_global_lock);
353 pr_warn("Failed to set source-id of HPET block (%d)\n", id);
358 * Should really use SQ_ALL_16. Some platforms are broken.
359 * While we figure out the right quirks for these broken platforms, use
360 * SQ_13_IGNORE_3 for now.
362 set_irte_sid(irte, SVT_VERIFY_SID_SQ, SQ_13_IGNORE_3, sid);
367 struct set_msi_sid_data {
368 struct pci_dev *pdev;
374 static int set_msi_sid_cb(struct pci_dev *pdev, u16 alias, void *opaque)
376 struct set_msi_sid_data *data = opaque;
378 if (data->count == 0 || PCI_BUS_NUM(alias) == PCI_BUS_NUM(data->alias))
379 data->busmatch_count++;
388 static int set_msi_sid(struct irte *irte, struct pci_dev *dev)
390 struct set_msi_sid_data data;
396 data.busmatch_count = 0;
397 pci_for_each_dma_alias(dev, set_msi_sid_cb, &data);
400 * DMA alias provides us with a PCI device and alias. The only case
401 * where the it will return an alias on a different bus than the
402 * device is the case of a PCIe-to-PCI bridge, where the alias is for
403 * the subordinate bus. In this case we can only verify the bus.
405 * If there are multiple aliases, all with the same bus number,
406 * then all we can do is verify the bus. This is typical in NTB
407 * hardware which use proxy IDs where the device will generate traffic
408 * from multiple devfn numbers on the same bus.
410 * If the alias device is on a different bus than our source device
411 * then we have a topology based alias, use it.
413 * Otherwise, the alias is for a device DMA quirk and we cannot
414 * assume that MSI uses the same requester ID. Therefore use the
417 if (PCI_BUS_NUM(data.alias) != data.pdev->bus->number)
418 set_irte_verify_bus(irte, PCI_BUS_NUM(data.alias),
420 else if (data.count >= 2 && data.busmatch_count == data.count)
421 set_irte_verify_bus(irte, dev->bus->number, dev->bus->number);
422 else if (data.pdev->bus->number != dev->bus->number)
423 set_irte_sid(irte, SVT_VERIFY_SID_SQ, SQ_ALL_16, data.alias);
425 set_irte_sid(irte, SVT_VERIFY_SID_SQ, SQ_ALL_16,
431 static int iommu_load_old_irte(struct intel_iommu *iommu)
433 struct irte *old_ir_table;
434 phys_addr_t irt_phys;
439 /* Check whether the old ir-table has the same size as ours */
440 irta = dmar_readq(iommu->reg + DMAR_IRTA_REG);
441 if ((irta & INTR_REMAP_TABLE_REG_SIZE_MASK)
442 != INTR_REMAP_TABLE_REG_SIZE)
445 irt_phys = irta & VTD_PAGE_MASK;
446 size = INTR_REMAP_TABLE_ENTRIES*sizeof(struct irte);
448 /* Map the old IR table */
449 old_ir_table = memremap(irt_phys, size, MEMREMAP_WB);
454 memcpy(iommu->ir_table->base, old_ir_table, size);
456 __iommu_flush_cache(iommu, iommu->ir_table->base, size);
459 * Now check the table for used entries and mark those as
460 * allocated in the bitmap
462 for (i = 0; i < INTR_REMAP_TABLE_ENTRIES; i++) {
463 if (iommu->ir_table->base[i].present)
464 bitmap_set(iommu->ir_table->bitmap, i, 1);
467 memunmap(old_ir_table);
473 static void iommu_set_irq_remapping(struct intel_iommu *iommu, int mode)
479 addr = virt_to_phys((void *)iommu->ir_table->base);
481 raw_spin_lock_irqsave(&iommu->register_lock, flags);
483 dmar_writeq(iommu->reg + DMAR_IRTA_REG,
484 (addr) | IR_X2APIC_MODE(mode) | INTR_REMAP_TABLE_REG_SIZE);
486 /* Set interrupt-remapping table pointer */
487 writel(iommu->gcmd | DMA_GCMD_SIRTP, iommu->reg + DMAR_GCMD_REG);
489 IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
490 readl, (sts & DMA_GSTS_IRTPS), sts);
491 raw_spin_unlock_irqrestore(&iommu->register_lock, flags);
494 * Global invalidation of interrupt entry cache to make sure the
495 * hardware uses the new irq remapping table.
497 qi_global_iec(iommu);
500 static void iommu_enable_irq_remapping(struct intel_iommu *iommu)
505 raw_spin_lock_irqsave(&iommu->register_lock, flags);
507 /* Enable interrupt-remapping */
508 iommu->gcmd |= DMA_GCMD_IRE;
509 writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
510 IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
511 readl, (sts & DMA_GSTS_IRES), sts);
513 /* Block compatibility-format MSIs */
514 if (sts & DMA_GSTS_CFIS) {
515 iommu->gcmd &= ~DMA_GCMD_CFI;
516 writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
517 IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
518 readl, !(sts & DMA_GSTS_CFIS), sts);
522 * With CFI clear in the Global Command register, we should be
523 * protected from dangerous (i.e. compatibility) interrupts
524 * regardless of x2apic status. Check just to be sure.
526 if (sts & DMA_GSTS_CFIS)
528 "Compatibility-format IRQs enabled despite intr remapping;\n"
529 "you are vulnerable to IRQ injection.\n");
531 raw_spin_unlock_irqrestore(&iommu->register_lock, flags);
534 static int intel_setup_irq_remapping(struct intel_iommu *iommu)
536 struct ir_table *ir_table;
537 struct fwnode_handle *fn;
538 unsigned long *bitmap;
544 ir_table = kzalloc(sizeof(struct ir_table), GFP_KERNEL);
548 pages = alloc_pages_node(iommu->node, GFP_KERNEL | __GFP_ZERO,
549 INTR_REMAP_PAGE_ORDER);
551 pr_err("IR%d: failed to allocate pages of order %d\n",
552 iommu->seq_id, INTR_REMAP_PAGE_ORDER);
556 bitmap = bitmap_zalloc(INTR_REMAP_TABLE_ENTRIES, GFP_ATOMIC);
557 if (bitmap == NULL) {
558 pr_err("IR%d: failed to allocate bitmap\n", iommu->seq_id);
562 fn = irq_domain_alloc_named_id_fwnode("INTEL-IR", iommu->seq_id);
564 goto out_free_bitmap;
567 irq_domain_create_hierarchy(arch_get_ir_parent_domain(),
568 0, INTR_REMAP_TABLE_ENTRIES,
569 fn, &intel_ir_domain_ops,
571 if (!iommu->ir_domain) {
572 pr_err("IR%d: failed to allocate irqdomain\n", iommu->seq_id);
573 goto out_free_fwnode;
575 iommu->ir_msi_domain =
576 arch_create_remap_msi_irq_domain(iommu->ir_domain,
580 ir_table->base = page_address(pages);
581 ir_table->bitmap = bitmap;
582 iommu->ir_table = ir_table;
585 * If the queued invalidation is already initialized,
586 * shouldn't disable it.
590 * Clear previous faults.
592 dmar_fault(-1, iommu);
593 dmar_disable_qi(iommu);
595 if (dmar_enable_qi(iommu)) {
596 pr_err("Failed to enable queued invalidation\n");
597 goto out_free_ir_domain;
601 init_ir_status(iommu);
603 if (ir_pre_enabled(iommu)) {
604 if (!is_kdump_kernel()) {
605 pr_warn("IRQ remapping was enabled on %s but we are not in kdump mode\n",
607 clear_ir_pre_enabled(iommu);
608 iommu_disable_irq_remapping(iommu);
609 } else if (iommu_load_old_irte(iommu))
610 pr_err("Failed to copy IR table for %s from previous kernel\n",
613 pr_info("Copied IR table for %s from previous kernel\n",
617 iommu_set_irq_remapping(iommu, eim_mode);
622 if (iommu->ir_msi_domain)
623 irq_domain_remove(iommu->ir_msi_domain);
624 iommu->ir_msi_domain = NULL;
625 irq_domain_remove(iommu->ir_domain);
626 iommu->ir_domain = NULL;
628 irq_domain_free_fwnode(fn);
632 __free_pages(pages, INTR_REMAP_PAGE_ORDER);
636 iommu->ir_table = NULL;
641 static void intel_teardown_irq_remapping(struct intel_iommu *iommu)
643 struct fwnode_handle *fn;
645 if (iommu && iommu->ir_table) {
646 if (iommu->ir_msi_domain) {
647 fn = iommu->ir_msi_domain->fwnode;
649 irq_domain_remove(iommu->ir_msi_domain);
650 irq_domain_free_fwnode(fn);
651 iommu->ir_msi_domain = NULL;
653 if (iommu->ir_domain) {
654 fn = iommu->ir_domain->fwnode;
656 irq_domain_remove(iommu->ir_domain);
657 irq_domain_free_fwnode(fn);
658 iommu->ir_domain = NULL;
660 free_pages((unsigned long)iommu->ir_table->base,
661 INTR_REMAP_PAGE_ORDER);
662 bitmap_free(iommu->ir_table->bitmap);
663 kfree(iommu->ir_table);
664 iommu->ir_table = NULL;
669 * Disable Interrupt Remapping.
671 static void iommu_disable_irq_remapping(struct intel_iommu *iommu)
676 if (!ecap_ir_support(iommu->ecap))
680 * global invalidation of interrupt entry cache before disabling
681 * interrupt-remapping.
683 qi_global_iec(iommu);
685 raw_spin_lock_irqsave(&iommu->register_lock, flags);
687 sts = readl(iommu->reg + DMAR_GSTS_REG);
688 if (!(sts & DMA_GSTS_IRES))
691 iommu->gcmd &= ~DMA_GCMD_IRE;
692 writel(iommu->gcmd, iommu->reg + DMAR_GCMD_REG);
694 IOMMU_WAIT_OP(iommu, DMAR_GSTS_REG,
695 readl, !(sts & DMA_GSTS_IRES), sts);
698 raw_spin_unlock_irqrestore(&iommu->register_lock, flags);
701 static int __init dmar_x2apic_optout(void)
703 struct acpi_table_dmar *dmar;
704 dmar = (struct acpi_table_dmar *)dmar_tbl;
705 if (!dmar || no_x2apic_optout)
707 return dmar->flags & DMAR_X2APIC_OPT_OUT;
710 static void __init intel_cleanup_irq_remapping(void)
712 struct dmar_drhd_unit *drhd;
713 struct intel_iommu *iommu;
715 for_each_iommu(iommu, drhd) {
716 if (ecap_ir_support(iommu->ecap)) {
717 iommu_disable_irq_remapping(iommu);
718 intel_teardown_irq_remapping(iommu);
722 if (x2apic_supported())
723 pr_warn("Failed to enable irq remapping. You are vulnerable to irq-injection attacks.\n");
726 static int __init intel_prepare_irq_remapping(void)
728 struct dmar_drhd_unit *drhd;
729 struct intel_iommu *iommu;
732 if (irq_remap_broken) {
733 pr_warn("This system BIOS has enabled interrupt remapping\n"
734 "on a chipset that contains an erratum making that\n"
735 "feature unstable. To maintain system stability\n"
736 "interrupt remapping is being disabled. Please\n"
737 "contact your BIOS vendor for an update\n");
738 add_taint(TAINT_FIRMWARE_WORKAROUND, LOCKDEP_STILL_OK);
742 if (dmar_table_init() < 0)
745 if (intel_cap_audit(CAP_AUDIT_STATIC_IRQR, NULL))
748 if (!dmar_ir_support())
751 if (parse_ioapics_under_ir()) {
752 pr_info("Not enabling interrupt remapping\n");
756 /* First make sure all IOMMUs support IRQ remapping */
757 for_each_iommu(iommu, drhd)
758 if (!ecap_ir_support(iommu->ecap))
761 /* Detect remapping mode: lapic or x2apic */
762 if (x2apic_supported()) {
763 eim = !dmar_x2apic_optout();
765 pr_info("x2apic is disabled because BIOS sets x2apic opt out bit.");
766 pr_info("Use 'intremap=no_x2apic_optout' to override the BIOS setting.\n");
770 for_each_iommu(iommu, drhd) {
771 if (eim && !ecap_eim_support(iommu->ecap)) {
772 pr_info("%s does not support EIM\n", iommu->name);
779 pr_info("Queued invalidation will be enabled to support x2apic and Intr-remapping.\n");
781 /* Do the initializations early */
782 for_each_iommu(iommu, drhd) {
783 if (intel_setup_irq_remapping(iommu)) {
784 pr_err("Failed to setup irq remapping for %s\n",
793 intel_cleanup_irq_remapping();
798 * Set Posted-Interrupts capability.
800 static inline void set_irq_posting_cap(void)
802 struct dmar_drhd_unit *drhd;
803 struct intel_iommu *iommu;
805 if (!disable_irq_post) {
807 * If IRTE is in posted format, the 'pda' field goes across the
808 * 64-bit boundary, we need use cmpxchg16b to atomically update
809 * it. We only expose posted-interrupt when X86_FEATURE_CX16
810 * is supported. Actually, hardware platforms supporting PI
811 * should have X86_FEATURE_CX16 support, this has been confirmed
812 * with Intel hardware guys.
814 if (boot_cpu_has(X86_FEATURE_CX16))
815 intel_irq_remap_ops.capability |= 1 << IRQ_POSTING_CAP;
817 for_each_iommu(iommu, drhd)
818 if (!cap_pi_support(iommu->cap)) {
819 intel_irq_remap_ops.capability &=
820 ~(1 << IRQ_POSTING_CAP);
826 static int __init intel_enable_irq_remapping(void)
828 struct dmar_drhd_unit *drhd;
829 struct intel_iommu *iommu;
833 * Setup Interrupt-remapping for all the DRHD's now.
835 for_each_iommu(iommu, drhd) {
836 if (!ir_pre_enabled(iommu))
837 iommu_enable_irq_remapping(iommu);
844 irq_remapping_enabled = 1;
846 set_irq_posting_cap();
848 pr_info("Enabled IRQ remapping in %s mode\n", eim_mode ? "x2apic" : "xapic");
850 return eim_mode ? IRQ_REMAP_X2APIC_MODE : IRQ_REMAP_XAPIC_MODE;
853 intel_cleanup_irq_remapping();
857 static int ir_parse_one_hpet_scope(struct acpi_dmar_device_scope *scope,
858 struct intel_iommu *iommu,
859 struct acpi_dmar_hardware_unit *drhd)
861 struct acpi_dmar_pci_path *path;
863 int count, free = -1;
866 path = (struct acpi_dmar_pci_path *)(scope + 1);
867 count = (scope->length - sizeof(struct acpi_dmar_device_scope))
868 / sizeof(struct acpi_dmar_pci_path);
870 while (--count > 0) {
872 * Access PCI directly due to the PCI
873 * subsystem isn't initialized yet.
875 bus = read_pci_config_byte(bus, path->device, path->function,
880 for (count = 0; count < MAX_HPET_TBS; count++) {
881 if (ir_hpet[count].iommu == iommu &&
882 ir_hpet[count].id == scope->enumeration_id)
884 else if (ir_hpet[count].iommu == NULL && free == -1)
888 pr_warn("Exceeded Max HPET blocks\n");
892 ir_hpet[free].iommu = iommu;
893 ir_hpet[free].id = scope->enumeration_id;
894 ir_hpet[free].bus = bus;
895 ir_hpet[free].devfn = PCI_DEVFN(path->device, path->function);
896 pr_info("HPET id %d under DRHD base 0x%Lx\n",
897 scope->enumeration_id, drhd->address);
902 static int ir_parse_one_ioapic_scope(struct acpi_dmar_device_scope *scope,
903 struct intel_iommu *iommu,
904 struct acpi_dmar_hardware_unit *drhd)
906 struct acpi_dmar_pci_path *path;
908 int count, free = -1;
911 path = (struct acpi_dmar_pci_path *)(scope + 1);
912 count = (scope->length - sizeof(struct acpi_dmar_device_scope))
913 / sizeof(struct acpi_dmar_pci_path);
915 while (--count > 0) {
917 * Access PCI directly due to the PCI
918 * subsystem isn't initialized yet.
920 bus = read_pci_config_byte(bus, path->device, path->function,
925 for (count = 0; count < MAX_IO_APICS; count++) {
926 if (ir_ioapic[count].iommu == iommu &&
927 ir_ioapic[count].id == scope->enumeration_id)
929 else if (ir_ioapic[count].iommu == NULL && free == -1)
933 pr_warn("Exceeded Max IO APICS\n");
937 ir_ioapic[free].bus = bus;
938 ir_ioapic[free].devfn = PCI_DEVFN(path->device, path->function);
939 ir_ioapic[free].iommu = iommu;
940 ir_ioapic[free].id = scope->enumeration_id;
941 pr_info("IOAPIC id %d under DRHD base 0x%Lx IOMMU %d\n",
942 scope->enumeration_id, drhd->address, iommu->seq_id);
947 static int ir_parse_ioapic_hpet_scope(struct acpi_dmar_header *header,
948 struct intel_iommu *iommu)
951 struct acpi_dmar_hardware_unit *drhd;
952 struct acpi_dmar_device_scope *scope;
955 drhd = (struct acpi_dmar_hardware_unit *)header;
956 start = (void *)(drhd + 1);
957 end = ((void *)drhd) + header->length;
959 while (start < end && ret == 0) {
961 if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_IOAPIC)
962 ret = ir_parse_one_ioapic_scope(scope, iommu, drhd);
963 else if (scope->entry_type == ACPI_DMAR_SCOPE_TYPE_HPET)
964 ret = ir_parse_one_hpet_scope(scope, iommu, drhd);
965 start += scope->length;
971 static void ir_remove_ioapic_hpet_scope(struct intel_iommu *iommu)
975 for (i = 0; i < MAX_HPET_TBS; i++)
976 if (ir_hpet[i].iommu == iommu)
977 ir_hpet[i].iommu = NULL;
979 for (i = 0; i < MAX_IO_APICS; i++)
980 if (ir_ioapic[i].iommu == iommu)
981 ir_ioapic[i].iommu = NULL;
985 * Finds the assocaition between IOAPIC's and its Interrupt-remapping
988 static int __init parse_ioapics_under_ir(void)
990 struct dmar_drhd_unit *drhd;
991 struct intel_iommu *iommu;
992 bool ir_supported = false;
995 for_each_iommu(iommu, drhd) {
998 if (!ecap_ir_support(iommu->ecap))
1001 ret = ir_parse_ioapic_hpet_scope(drhd->hdr, iommu);
1005 ir_supported = true;
1011 for (ioapic_idx = 0; ioapic_idx < nr_ioapics; ioapic_idx++) {
1012 int ioapic_id = mpc_ioapic_id(ioapic_idx);
1013 if (!map_ioapic_to_iommu(ioapic_id)) {
1014 pr_err(FW_BUG "ioapic %d has no mapping iommu, "
1015 "interrupt remapping will be disabled\n",
1024 static int __init ir_dev_scope_init(void)
1028 if (!irq_remapping_enabled)
1031 down_write(&dmar_global_lock);
1032 ret = dmar_dev_scope_init();
1033 up_write(&dmar_global_lock);
1037 rootfs_initcall(ir_dev_scope_init);
1039 static void disable_irq_remapping(void)
1041 struct dmar_drhd_unit *drhd;
1042 struct intel_iommu *iommu = NULL;
1045 * Disable Interrupt-remapping for all the DRHD's now.
1047 for_each_iommu(iommu, drhd) {
1048 if (!ecap_ir_support(iommu->ecap))
1051 iommu_disable_irq_remapping(iommu);
1055 * Clear Posted-Interrupts capability.
1057 if (!disable_irq_post)
1058 intel_irq_remap_ops.capability &= ~(1 << IRQ_POSTING_CAP);
1061 static int reenable_irq_remapping(int eim)
1063 struct dmar_drhd_unit *drhd;
1065 struct intel_iommu *iommu = NULL;
1067 for_each_iommu(iommu, drhd)
1069 dmar_reenable_qi(iommu);
1072 * Setup Interrupt-remapping for all the DRHD's now.
1074 for_each_iommu(iommu, drhd) {
1075 if (!ecap_ir_support(iommu->ecap))
1078 /* Set up interrupt remapping for iommu.*/
1079 iommu_set_irq_remapping(iommu, eim);
1080 iommu_enable_irq_remapping(iommu);
1087 set_irq_posting_cap();
1093 * handle error condition gracefully here!
1099 * Store the MSI remapping domain pointer in the device if enabled.
1101 * This is called from dmar_pci_bus_add_dev() so it works even when DMA
1102 * remapping is disabled. Only update the pointer if the device is not
1103 * already handled by a non default PCI/MSI interrupt domain. This protects
1106 void intel_irq_remap_add_device(struct dmar_pci_notify_info *info)
1108 if (!irq_remapping_enabled || pci_dev_has_special_msi_domain(info->dev))
1111 dev_set_msi_domain(&info->dev->dev, map_dev_to_ir(info->dev));
1114 static void prepare_irte(struct irte *irte, int vector, unsigned int dest)
1116 memset(irte, 0, sizeof(*irte));
1119 irte->dst_mode = apic->dest_mode_logical;
1121 * Trigger mode in the IRTE will always be edge, and for IO-APIC, the
1122 * actual level or edge trigger will be setup in the IO-APIC
1123 * RTE. This will help simplify level triggered irq migration.
1124 * For more details, see the comments (in io_apic.c) explainig IO-APIC
1125 * irq migration in the presence of interrupt-remapping.
1127 irte->trigger_mode = 0;
1128 irte->dlvry_mode = apic->delivery_mode;
1129 irte->vector = vector;
1130 irte->dest_id = IRTE_DEST(dest);
1131 irte->redir_hint = 1;
1134 struct irq_remap_ops intel_irq_remap_ops = {
1135 .prepare = intel_prepare_irq_remapping,
1136 .enable = intel_enable_irq_remapping,
1137 .disable = disable_irq_remapping,
1138 .reenable = reenable_irq_remapping,
1139 .enable_faulting = enable_drhd_fault_handling,
1142 static void intel_ir_reconfigure_irte(struct irq_data *irqd, bool force)
1144 struct intel_ir_data *ir_data = irqd->chip_data;
1145 struct irte *irte = &ir_data->irte_entry;
1146 struct irq_cfg *cfg = irqd_cfg(irqd);
1149 * Atomically updates the IRTE with the new destination, vector
1150 * and flushes the interrupt entry cache.
1152 irte->vector = cfg->vector;
1153 irte->dest_id = IRTE_DEST(cfg->dest_apicid);
1155 /* Update the hardware only if the interrupt is in remapped mode. */
1156 if (force || ir_data->irq_2_iommu.mode == IRQ_REMAPPING)
1157 modify_irte(&ir_data->irq_2_iommu, irte);
1161 * Migrate the IO-APIC irq in the presence of intr-remapping.
1163 * For both level and edge triggered, irq migration is a simple atomic
1164 * update(of vector and cpu destination) of IRTE and flush the hardware cache.
1166 * For level triggered, we eliminate the io-apic RTE modification (with the
1167 * updated vector information), by using a virtual vector (io-apic pin number).
1168 * Real vector that is used for interrupting cpu will be coming from
1169 * the interrupt-remapping table entry.
1171 * As the migration is a simple atomic update of IRTE, the same mechanism
1172 * is used to migrate MSI irq's in the presence of interrupt-remapping.
1175 intel_ir_set_affinity(struct irq_data *data, const struct cpumask *mask,
1178 struct irq_data *parent = data->parent_data;
1179 struct irq_cfg *cfg = irqd_cfg(data);
1182 ret = parent->chip->irq_set_affinity(parent, mask, force);
1183 if (ret < 0 || ret == IRQ_SET_MASK_OK_DONE)
1186 intel_ir_reconfigure_irte(data, false);
1188 * After this point, all the interrupts will start arriving
1189 * at the new destination. So, time to cleanup the previous
1190 * vector allocation.
1192 send_cleanup_vector(cfg);
1194 return IRQ_SET_MASK_OK_DONE;
1197 static void intel_ir_compose_msi_msg(struct irq_data *irq_data,
1198 struct msi_msg *msg)
1200 struct intel_ir_data *ir_data = irq_data->chip_data;
1202 *msg = ir_data->msi_entry;
1205 static int intel_ir_set_vcpu_affinity(struct irq_data *data, void *info)
1207 struct intel_ir_data *ir_data = data->chip_data;
1208 struct vcpu_data *vcpu_pi_info = info;
1210 /* stop posting interrupts, back to remapping mode */
1211 if (!vcpu_pi_info) {
1212 modify_irte(&ir_data->irq_2_iommu, &ir_data->irte_entry);
1214 struct irte irte_pi;
1217 * We are not caching the posted interrupt entry. We
1218 * copy the data from the remapped entry and modify
1219 * the fields which are relevant for posted mode. The
1220 * cached remapped entry is used for switching back to
1223 memset(&irte_pi, 0, sizeof(irte_pi));
1224 dmar_copy_shared_irte(&irte_pi, &ir_data->irte_entry);
1226 /* Update the posted mode fields */
1228 irte_pi.p_urgent = 0;
1229 irte_pi.p_vector = vcpu_pi_info->vector;
1230 irte_pi.pda_l = (vcpu_pi_info->pi_desc_addr >>
1231 (32 - PDA_LOW_BIT)) & ~(-1UL << PDA_LOW_BIT);
1232 irte_pi.pda_h = (vcpu_pi_info->pi_desc_addr >> 32) &
1233 ~(-1UL << PDA_HIGH_BIT);
1235 modify_irte(&ir_data->irq_2_iommu, &irte_pi);
1241 static struct irq_chip intel_ir_chip = {
1243 .irq_ack = apic_ack_irq,
1244 .irq_set_affinity = intel_ir_set_affinity,
1245 .irq_compose_msi_msg = intel_ir_compose_msi_msg,
1246 .irq_set_vcpu_affinity = intel_ir_set_vcpu_affinity,
1249 static void fill_msi_msg(struct msi_msg *msg, u32 index, u32 subhandle)
1251 memset(msg, 0, sizeof(*msg));
1253 msg->arch_addr_lo.dmar_base_address = X86_MSI_BASE_ADDRESS_LOW;
1254 msg->arch_addr_lo.dmar_subhandle_valid = true;
1255 msg->arch_addr_lo.dmar_format = true;
1256 msg->arch_addr_lo.dmar_index_0_14 = index & 0x7FFF;
1257 msg->arch_addr_lo.dmar_index_15 = !!(index & 0x8000);
1259 msg->address_hi = X86_MSI_BASE_ADDRESS_HIGH;
1261 msg->arch_data.dmar_subhandle = subhandle;
1264 static void intel_irq_remapping_prepare_irte(struct intel_ir_data *data,
1265 struct irq_cfg *irq_cfg,
1266 struct irq_alloc_info *info,
1267 int index, int sub_handle)
1269 struct irte *irte = &data->irte_entry;
1271 prepare_irte(irte, irq_cfg->vector, irq_cfg->dest_apicid);
1273 switch (info->type) {
1274 case X86_IRQ_ALLOC_TYPE_IOAPIC:
1275 /* Set source-id of interrupt request */
1276 set_ioapic_sid(irte, info->devid);
1277 apic_printk(APIC_VERBOSE, KERN_DEBUG "IOAPIC[%d]: Set IRTE entry (P:%d FPD:%d Dst_Mode:%d Redir_hint:%d Trig_Mode:%d Dlvry_Mode:%X Avail:%X Vector:%02X Dest:%08X SID:%04X SQ:%X SVT:%X)\n",
1278 info->devid, irte->present, irte->fpd,
1279 irte->dst_mode, irte->redir_hint,
1280 irte->trigger_mode, irte->dlvry_mode,
1281 irte->avail, irte->vector, irte->dest_id,
1282 irte->sid, irte->sq, irte->svt);
1283 sub_handle = info->ioapic.pin;
1285 case X86_IRQ_ALLOC_TYPE_HPET:
1286 set_hpet_sid(irte, info->devid);
1288 case X86_IRQ_ALLOC_TYPE_PCI_MSI:
1289 case X86_IRQ_ALLOC_TYPE_PCI_MSIX:
1291 pci_real_dma_dev(msi_desc_to_pci_dev(info->desc)));
1297 fill_msi_msg(&data->msi_entry, index, sub_handle);
1300 static void intel_free_irq_resources(struct irq_domain *domain,
1301 unsigned int virq, unsigned int nr_irqs)
1303 struct irq_data *irq_data;
1304 struct intel_ir_data *data;
1305 struct irq_2_iommu *irq_iommu;
1306 unsigned long flags;
1308 for (i = 0; i < nr_irqs; i++) {
1309 irq_data = irq_domain_get_irq_data(domain, virq + i);
1310 if (irq_data && irq_data->chip_data) {
1311 data = irq_data->chip_data;
1312 irq_iommu = &data->irq_2_iommu;
1313 raw_spin_lock_irqsave(&irq_2_ir_lock, flags);
1314 clear_entries(irq_iommu);
1315 raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags);
1316 irq_domain_reset_irq_data(irq_data);
1322 static int intel_irq_remapping_alloc(struct irq_domain *domain,
1323 unsigned int virq, unsigned int nr_irqs,
1326 struct intel_iommu *iommu = domain->host_data;
1327 struct irq_alloc_info *info = arg;
1328 struct intel_ir_data *data, *ird;
1329 struct irq_data *irq_data;
1330 struct irq_cfg *irq_cfg;
1333 if (!info || !iommu)
1335 if (nr_irqs > 1 && info->type != X86_IRQ_ALLOC_TYPE_PCI_MSI &&
1336 info->type != X86_IRQ_ALLOC_TYPE_PCI_MSIX)
1340 * With IRQ remapping enabled, don't need contiguous CPU vectors
1341 * to support multiple MSI interrupts.
1343 if (info->type == X86_IRQ_ALLOC_TYPE_PCI_MSI)
1344 info->flags &= ~X86_IRQ_ALLOC_CONTIGUOUS_VECTORS;
1346 ret = irq_domain_alloc_irqs_parent(domain, virq, nr_irqs, arg);
1351 data = kzalloc(sizeof(*data), GFP_KERNEL);
1353 goto out_free_parent;
1355 down_read(&dmar_global_lock);
1356 index = alloc_irte(iommu, &data->irq_2_iommu, nr_irqs);
1357 up_read(&dmar_global_lock);
1359 pr_warn("Failed to allocate IRTE\n");
1361 goto out_free_parent;
1364 for (i = 0; i < nr_irqs; i++) {
1365 irq_data = irq_domain_get_irq_data(domain, virq + i);
1366 irq_cfg = irqd_cfg(irq_data);
1367 if (!irq_data || !irq_cfg) {
1375 ird = kzalloc(sizeof(*ird), GFP_KERNEL);
1378 /* Initialize the common data */
1379 ird->irq_2_iommu = data->irq_2_iommu;
1380 ird->irq_2_iommu.sub_handle = i;
1385 irq_data->hwirq = (index << 16) + i;
1386 irq_data->chip_data = ird;
1387 irq_data->chip = &intel_ir_chip;
1388 intel_irq_remapping_prepare_irte(ird, irq_cfg, info, index, i);
1389 irq_set_status_flags(virq + i, IRQ_MOVE_PCNTXT);
1394 intel_free_irq_resources(domain, virq, i);
1396 irq_domain_free_irqs_common(domain, virq, nr_irqs);
1400 static void intel_irq_remapping_free(struct irq_domain *domain,
1401 unsigned int virq, unsigned int nr_irqs)
1403 intel_free_irq_resources(domain, virq, nr_irqs);
1404 irq_domain_free_irqs_common(domain, virq, nr_irqs);
1407 static int intel_irq_remapping_activate(struct irq_domain *domain,
1408 struct irq_data *irq_data, bool reserve)
1410 intel_ir_reconfigure_irte(irq_data, true);
1414 static void intel_irq_remapping_deactivate(struct irq_domain *domain,
1415 struct irq_data *irq_data)
1417 struct intel_ir_data *data = irq_data->chip_data;
1420 memset(&entry, 0, sizeof(entry));
1421 modify_irte(&data->irq_2_iommu, &entry);
1424 static int intel_irq_remapping_select(struct irq_domain *d,
1425 struct irq_fwspec *fwspec,
1426 enum irq_domain_bus_token bus_token)
1428 struct intel_iommu *iommu = NULL;
1430 if (x86_fwspec_is_ioapic(fwspec))
1431 iommu = map_ioapic_to_iommu(fwspec->param[0]);
1432 else if (x86_fwspec_is_hpet(fwspec))
1433 iommu = map_hpet_to_iommu(fwspec->param[0]);
1435 return iommu && d == iommu->ir_domain;
1438 static const struct irq_domain_ops intel_ir_domain_ops = {
1439 .select = intel_irq_remapping_select,
1440 .alloc = intel_irq_remapping_alloc,
1441 .free = intel_irq_remapping_free,
1442 .activate = intel_irq_remapping_activate,
1443 .deactivate = intel_irq_remapping_deactivate,
1447 * Support of Interrupt Remapping Unit Hotplug
1449 static int dmar_ir_add(struct dmar_drhd_unit *dmaru, struct intel_iommu *iommu)
1452 int eim = x2apic_enabled();
1454 ret = intel_cap_audit(CAP_AUDIT_HOTPLUG_IRQR, iommu);
1458 if (eim && !ecap_eim_support(iommu->ecap)) {
1459 pr_info("DRHD %Lx: EIM not supported by DRHD, ecap %Lx\n",
1460 iommu->reg_phys, iommu->ecap);
1464 if (ir_parse_ioapic_hpet_scope(dmaru->hdr, iommu)) {
1465 pr_warn("DRHD %Lx: failed to parse managed IOAPIC/HPET\n",
1470 /* TODO: check all IOAPICs are covered by IOMMU */
1472 /* Setup Interrupt-remapping now. */
1473 ret = intel_setup_irq_remapping(iommu);
1475 pr_err("Failed to setup irq remapping for %s\n",
1477 intel_teardown_irq_remapping(iommu);
1478 ir_remove_ioapic_hpet_scope(iommu);
1480 iommu_enable_irq_remapping(iommu);
1486 int dmar_ir_hotplug(struct dmar_drhd_unit *dmaru, bool insert)
1489 struct intel_iommu *iommu = dmaru->iommu;
1491 if (!irq_remapping_enabled)
1495 if (!ecap_ir_support(iommu->ecap))
1497 if (irq_remapping_cap(IRQ_POSTING_CAP) &&
1498 !cap_pi_support(iommu->cap))
1502 if (!iommu->ir_table)
1503 ret = dmar_ir_add(dmaru, iommu);
1505 if (iommu->ir_table) {
1506 if (!bitmap_empty(iommu->ir_table->bitmap,
1507 INTR_REMAP_TABLE_ENTRIES)) {
1510 iommu_disable_irq_remapping(iommu);
1511 intel_teardown_irq_remapping(iommu);
1512 ir_remove_ioapic_hpet_scope(iommu);