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powerpc/xive: Add a debugfs file to dump EQs

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The XIVE driver under Linux uses a single interrupt priority and only
one event queue is configured per CPU. Expose the contents under
a 'xive/eqs/cpuX' debugfs file.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211105102636.1016378-8-clg@kaod.org
This commit is contained in:
Cédric Le Goater 2021-11-05 11:26:32 +01:00 committed by Michael Ellerman
parent 33e1d4a152
commit 08f3f61021
1 changed files with 37 additions and 0 deletions
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37
arch/powerpc/sysdev/xive/common.c
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@ -1774,9 +1774,40 @@ static int xive_ipi_debug_show(struct seq_file *m, void *private)
}
DEFINE_SHOW_ATTRIBUTE(xive_ipi_debug);
static void xive_eq_debug_show_one(struct seq_file *m, struct xive_q *q, u8 prio)
{
int i;
seq_printf(m, "EQ%d idx=%d T=%d\n", prio, q->idx, q->toggle);
if (q->qpage) {
for (i = 0; i < q->msk + 1; i++) {
if (!(i % 8))
seq_printf(m, "%05d ", i);
seq_printf(m, "%08x%s", be32_to_cpup(q->qpage + i),
(i + 1) % 8 ? " " : "\n");
}
}
seq_puts(m, "\n");
}
static int xive_eq_debug_show(struct seq_file *m, void *private)
{
int cpu = (long)m->private;
struct xive_cpu *xc = per_cpu(xive_cpu, cpu);
if (xc)
xive_eq_debug_show_one(m, &xc->queue[xive_irq_priority],
xive_irq_priority);
return 0;
}
DEFINE_SHOW_ATTRIBUTE(xive_eq_debug);
static void xive_core_debugfs_create(void)
{
struct dentry *xive_dir;
struct dentry *xive_eq_dir;
long cpu;
char name[16];
xive_dir = debugfs_create_dir("xive", arch_debugfs_dir);
if (IS_ERR(xive_dir))
@ -1786,6 +1817,12 @@ static void xive_core_debugfs_create(void)
NULL, &xive_ipi_debug_fops);
debugfs_create_file("interrupts", 0400, xive_dir,
NULL, &xive_irq_debug_fops);
xive_eq_dir = debugfs_create_dir("eqs", xive_dir);
for_each_possible_cpu(cpu) {
snprintf(name, sizeof(name), "cpu%ld", cpu);
debugfs_create_file(name, 0400, xive_eq_dir, (void *)cpu,
&xive_eq_debug_fops);
}
}
#else
static inline void xive_core_debugfs_create(void) { }