diff options
author | Thomas Gleixner <tglx@linutronix.de> | 2017-09-13 23:29:39 +0200 |
---|---|---|
committer | Thomas Gleixner <tglx@linutronix.de> | 2017-09-25 20:51:57 +0200 |
commit | 65d7ed57bd9708d562a37fa3f99bf9fd62052b9e (patch) | |
tree | 3dbe6f79f98d3594addd13d1629f2cd9a7eb18cf /arch/x86/kernel/apic/vector.c | |
parent | 0fa115da408f645cca419a60a5af8f4426ad4188 (diff) | |
download | linux-65d7ed57bd9708d562a37fa3f99bf9fd62052b9e.tar.bz2 |
x86/vector: Add vector domain debugfs support
Add the debug callback for the vector domain, which gives a detailed
information about vector usage if invoked for the domain by using rhe
matrix allocator debug function and vector/target information when invoked
for a particular interrupt.
Extra information foir the Vector domain:
Online bitmaps: 32
Global available: 6352
Global reserved: 5
Total allocated: 20
System: 41: 0-19,32,50,128,238-255
| CPU | avl | man | act | vectors
0 183 4 19 33-48,51-53
1 199 4 1 33
2 199 4 0
Extra information for interrupts:
Vector: 42
Target: 4
This allows a detailed analysis of the vector usage and the association to
interrupts and devices.
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: Juergen Gross <jgross@suse.com>
Tested-by: Yu Chen <yu.c.chen@intel.com>
Acked-by: Juergen Gross <jgross@suse.com>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Tony Luck <tony.luck@intel.com>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Alok Kataria <akataria@vmware.com>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: "Rafael J. Wysocki" <rjw@rjwysocki.net>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Rui Zhang <rui.zhang@intel.com>
Cc: "K. Y. Srinivasan" <kys@microsoft.com>
Cc: Arjan van de Ven <arjan@linux.intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Len Brown <lenb@kernel.org>
Link: https://lkml.kernel.org/r/20170913213155.188137174@linutronix.de
Diffstat (limited to 'arch/x86/kernel/apic/vector.c')
-rw-r--r-- | arch/x86/kernel/apic/vector.c | 50 |
1 files changed, 48 insertions, 2 deletions
diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c index 078fbd08499c..acdc74df649d 100644 --- a/arch/x86/kernel/apic/vector.c +++ b/arch/x86/kernel/apic/vector.c @@ -11,6 +11,7 @@ * published by the Free Software Foundation. */ #include <linux/interrupt.h> +#include <linux/seq_file.h> #include <linux/init.h> #include <linux/compiler.h> #include <linux/slab.h> @@ -373,9 +374,54 @@ error: return err; } +#ifdef CONFIG_GENERIC_IRQ_DEBUGFS +void x86_vector_debug_show(struct seq_file *m, struct irq_domain *d, + struct irq_data *irqd, int ind) +{ + unsigned int cpu, vec, prev_cpu, prev_vec; + struct apic_chip_data *apicd; + unsigned long flags; + int irq; + + if (!irqd) { + irq_matrix_debug_show(m, vector_matrix, ind); + return; + } + + irq = irqd->irq; + if (irq < nr_legacy_irqs() && !test_bit(irq, &io_apic_irqs)) { + seq_printf(m, "%*sVector: %5d\n", ind, "", ISA_IRQ_VECTOR(irq)); + seq_printf(m, "%*sTarget: Legacy PIC all CPUs\n", ind, ""); + return; + } + + apicd = irqd->chip_data; + if (!apicd) { + seq_printf(m, "%*sVector: Not assigned\n", ind, ""); + return; + } + + raw_spin_lock_irqsave(&vector_lock, flags); + cpu = apicd->cpu; + vec = apicd->cfg.vector; + prev_cpu = apicd->prev_cpu; + prev_vec = apicd->cfg.old_vector; + raw_spin_unlock_irqrestore(&vector_lock, flags); + seq_printf(m, "%*sVector: %5u\n", ind, "", vec); + seq_printf(m, "%*sTarget: %5u\n", ind, "", cpu); + if (prev_vec) { + seq_printf(m, "%*sPrevious vector: %5u\n", ind, "", prev_vec); + seq_printf(m, "%*sPrevious target: %5u\n", ind, "", prev_cpu); + } +} +#endif + static const struct irq_domain_ops x86_vector_domain_ops = { - .alloc = x86_vector_alloc_irqs, - .free = x86_vector_free_irqs, + .alloc = x86_vector_alloc_irqs, + .free = x86_vector_free_irqs, +#ifdef CONFIG_GENERIC_IRQ_DEBUGFS + .debug_show = x86_vector_debug_show, +#endif }; int __init arch_probe_nr_irqs(void) |