From a6d268c619d6765322f2fbdd1d7d2769ebc04cb2 Mon Sep 17 00:00:00 2001 From: Sohil Mehta Date: Tue, 11 Sep 2018 17:11:40 -0700 Subject: iommu/vt-d: Add debugfs support for Interrupt remapping Debugfs extension for Intel IOMMU to dump Interrupt remapping table entries for Interrupt remapping and Interrupt posting. The file /sys/kernel/debug/iommu/intel/ir_translation_struct provides detailed information, such as Index, Source Id, Destination Id, Vector and the IRTE values for entries with the present bit set, in the format shown. Remapped Interrupt supported on IOMMU: dmar1 IR table address:85e500000 Entry SrcID DstID Vct IRTE_high IRTE_low 24 01:00.0 00000001 24 0000000000040100 000000010024000d 25 01:00.0 00000004 22 0000000000040100 000000040022000d Posted Interrupt supported on IOMMU: dmar5 IR table address:85ec00000 Entry SrcID PDA_high PDA_low Vct IRTE_high IRTE_low 4 43:00.0 0000000f ff765980 41 0000000f00044300 ff76598000418001 5 43:00.0 0000000f ff765980 51 0000000f00044300 ff76598000518001 Cc: Lu Baolu Cc: Jacob Pan Cc: Fenghua Yu Cc: Ashok Raj Co-Developed-by: Gayatri Kammela Signed-off-by: Gayatri Kammela Reviewed-by: Andy Shevchenko Signed-off-by: Sohil Mehta Signed-off-by: Joerg Roedel --- drivers/iommu/intel-iommu-debugfs.c | 108 ++++++++++++++++++++++++++++++++++++ 1 file changed, 108 insertions(+) (limited to 'drivers/iommu/intel-iommu-debugfs.c') diff --git a/drivers/iommu/intel-iommu-debugfs.c b/drivers/iommu/intel-iommu-debugfs.c index 57af2f774312..2becbd78620f 100644 --- a/drivers/iommu/intel-iommu-debugfs.c +++ b/drivers/iommu/intel-iommu-debugfs.c @@ -131,6 +131,110 @@ out: } DEFINE_SHOW_ATTRIBUTE(iommu_regset); +#ifdef CONFIG_IRQ_REMAP +static void ir_tbl_remap_entry_show(struct seq_file *m, + struct intel_iommu *iommu) +{ + struct irte *ri_entry; + unsigned long flags; + int idx; + + seq_puts(m, " Entry SrcID DstID Vct IRTE_high\t\tIRTE_low\n"); + + raw_spin_lock_irqsave(&irq_2_ir_lock, flags); + for (idx = 0; idx < INTR_REMAP_TABLE_ENTRIES; idx++) { + ri_entry = &iommu->ir_table->base[idx]; + if (!ri_entry->present || ri_entry->p_pst) + continue; + + seq_printf(m, " %-5d %02x:%02x.%01x %08x %02x %016llx\t%016llx\n", + idx, PCI_BUS_NUM(ri_entry->sid), + PCI_SLOT(ri_entry->sid), PCI_FUNC(ri_entry->sid), + ri_entry->dest_id, ri_entry->vector, + ri_entry->high, ri_entry->low); + } + raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags); +} + +static void ir_tbl_posted_entry_show(struct seq_file *m, + struct intel_iommu *iommu) +{ + struct irte *pi_entry; + unsigned long flags; + int idx; + + seq_puts(m, " Entry SrcID PDA_high PDA_low Vct IRTE_high\t\tIRTE_low\n"); + + raw_spin_lock_irqsave(&irq_2_ir_lock, flags); + for (idx = 0; idx < INTR_REMAP_TABLE_ENTRIES; idx++) { + pi_entry = &iommu->ir_table->base[idx]; + if (!pi_entry->present || !pi_entry->p_pst) + continue; + + seq_printf(m, " %-5d %02x:%02x.%01x %08x %08x %02x %016llx\t%016llx\n", + idx, PCI_BUS_NUM(pi_entry->sid), + PCI_SLOT(pi_entry->sid), PCI_FUNC(pi_entry->sid), + pi_entry->pda_h, pi_entry->pda_l << 6, + pi_entry->vector, pi_entry->high, + pi_entry->low); + } + raw_spin_unlock_irqrestore(&irq_2_ir_lock, flags); +} + +/* + * For active IOMMUs go through the Interrupt remapping + * table and print valid entries in a table format for + * Remapped and Posted Interrupts. + */ +static int ir_translation_struct_show(struct seq_file *m, void *unused) +{ + struct dmar_drhd_unit *drhd; + struct intel_iommu *iommu; + u64 irta; + + rcu_read_lock(); + for_each_active_iommu(iommu, drhd) { + if (!ecap_ir_support(iommu->ecap)) + continue; + + seq_printf(m, "Remapped Interrupt supported on IOMMU: %s\n", + iommu->name); + + if (iommu->ir_table) { + irta = virt_to_phys(iommu->ir_table->base); + seq_printf(m, " IR table address:%llx\n", irta); + ir_tbl_remap_entry_show(m, iommu); + } else { + seq_puts(m, "Interrupt Remapping is not enabled\n"); + } + seq_putc(m, '\n'); + } + + seq_puts(m, "****\n\n"); + + for_each_active_iommu(iommu, drhd) { + if (!cap_pi_support(iommu->cap)) + continue; + + seq_printf(m, "Posted Interrupt supported on IOMMU: %s\n", + iommu->name); + + if (iommu->ir_table) { + irta = virt_to_phys(iommu->ir_table->base); + seq_printf(m, " IR table address:%llx\n", irta); + ir_tbl_posted_entry_show(m, iommu); + } else { + seq_puts(m, "Interrupt Remapping is not enabled\n"); + } + seq_putc(m, '\n'); + } + rcu_read_unlock(); + + return 0; +} +DEFINE_SHOW_ATTRIBUTE(ir_translation_struct); +#endif + void __init intel_iommu_debugfs_init(void) { struct dentry *intel_iommu_debug = debugfs_create_dir("intel", @@ -138,4 +242,8 @@ void __init intel_iommu_debugfs_init(void) debugfs_create_file("iommu_regset", 0444, intel_iommu_debug, NULL, &iommu_regset_fops); +#ifdef CONFIG_IRQ_REMAP + debugfs_create_file("ir_translation_struct", 0444, intel_iommu_debug, + NULL, &ir_translation_struct_fops); +#endif } -- cgit v1.2.3-59-g8ed1b