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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
This commit is contained in:
Thomas Gleixner 2017-09-13 23:29:39 +02:00
parent 0fa115da40
commit 65d7ed57bd
1 changed files with 48 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

50
arch/x86/kernel/apic/vector.c
View File

@ -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 @@ static int x86_vector_alloc_irqs(struct irq_domain *domain, unsigned int virq,
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)