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powerpc/xive: Add a debugfs file to dump internal XIVE state

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As does XMON, the debugfs file /sys/kernel/debug/powerpc/xive exposes
the XIVE internal state of the machine CPUs and interrupts. Available
on the PowerNV and sPAPR platforms.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
[mpe: Make the debugfs file 0400]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200306150143.5551-5-clg@kaod.org
This commit is contained in:
Cédric Le Goater
2020-03-06 16:01:43 +01:00
committed by Michael Ellerman
parent 5191e0ba51
commit 930914b7d5
4 changed files with 129 additions and 0 deletions
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19
arch/powerpc/sysdev/xive/spapr.c
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@@ -18,6 +18,7 @@
#include <linux/delay.h>
#include <linux/libfdt.h>
#include <asm/machdep.h>
#include <asm/prom.h>
#include <asm/io.h>
#include <asm/smp.h>
@@ -645,6 +646,21 @@ static void xive_spapr_sync_source(u32 hw_irq)
plpar_int_sync(0, hw_irq);
}
static int xive_spapr_debug_show(struct seq_file *m, void *private)
{
struct xive_irq_bitmap *xibm;
char *buf = kmalloc(PAGE_SIZE, GFP_KERNEL);
list_for_each_entry(xibm, &xive_irq_bitmaps, list) {
memset(buf, 0, PAGE_SIZE);
bitmap_print_to_pagebuf(true, buf, xibm->bitmap, xibm->count);
seq_printf(m, "bitmap #%d: %s", xibm->count, buf);
}
kfree(buf);
return 0;
}
static const struct xive_ops xive_spapr_ops = {
.populate_irq_data = xive_spapr_populate_irq_data,
.configure_irq = xive_spapr_configure_irq,
@@ -662,6 +678,7 @@ static const struct xive_ops xive_spapr_ops = {
#ifdef CONFIG_SMP
.get_ipi = xive_spapr_get_ipi,
.put_ipi = xive_spapr_put_ipi,
.debug_show = xive_spapr_debug_show,
#endif /* CONFIG_SMP */
.name = "spapr",
};
@@ -839,3 +856,5 @@ bool __init xive_spapr_init(void)
pr_info("Using %dkB queues\n", 1 << (xive_queue_shift - 10));
return true;
}
machine_arch_initcall(pseries, xive_core_debug_init);