Commit-ID: 65d7ed57bd9708d562a37fa3f99bf9fd62052b9e
Gitweb: http://git.kernel.org/tip/65d7ed57bd9708d562a37fa3f99bf9fd62052b9e
Author: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
AuthorDate: Wed, 13 Sep 2017 23:29:39 +0200
Committer: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
CommitDate: Mon, 25 Sep 2017 20:51:57 +0200
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@xxxxxxxxxxxxx>
Tested-by: Juergen Gross <jgross@xxxxxxxx>
Tested-by: Yu Chen <yu.c.chen@xxxxxxxxx>
Acked-by: Juergen Gross <jgross@xxxxxxxx>
Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Cc: Tony Luck <tony.luck@xxxxxxxxx>
Cc: Marc Zyngier <marc.zyngier@xxxxxxx>
Cc: Alok Kataria <akataria@xxxxxxxxxx>
Cc: Joerg Roedel <joro@xxxxxxxxxx>
Cc: "Rafael J. Wysocki" <rjw@xxxxxxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Cc: Rui Zhang <rui.zhang@xxxxxxxxx>
Cc: "K. Y. Srinivasan" <kys@xxxxxxxxxxxxx>
Cc: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Len Brown <lenb@xxxxxxxxxx>
Link: https://lkml.kernel.org/r/20170913213155.188137174@xxxxxxxxxxxxx
---
arch/x86/kernel/apic/vector.c | 50 +++++++++++++++++++++++++++++++++++++++++--
1 file changed, 48 insertions(+), 2 deletions(-)
diff --git a/arch/x86/kernel/apic/vector.c b/arch/x86/kernel/apic/vector.c
index 078fbd0..acdc74d 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)
--
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