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powerpc/xive: Add a debug_show handler to the XIVE irq_domain

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Full state of the Linux interrupt descriptors can be dumped under
debugfs when compiled with CONFIG_GENERIC_IRQ_DEBUGFS. Add support for
the XIVE interrupt controller.

Signed-off-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20201210171450.1933725-7-clg@kaod.org
This commit is contained in:
Cédric Le Goater 2020-12-10 18:14:43 +01:00 committed by Michael Ellerman
parent 9dfe4b14df
commit a5021abc48
1 changed files with 58 additions and 0 deletions
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58
arch/powerpc/sysdev/xive/common.c
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@ -1303,11 +1303,69 @@ static int xive_irq_domain_match(struct irq_domain *h, struct device_node *node,
return xive_ops->match(node);
}
#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
static const char * const esb_names[] = { "RESET", "OFF", "PENDING", "QUEUED" };
static const struct {
u64 mask;
char *name;
} xive_irq_flags[] = {
{ XIVE_IRQ_FLAG_STORE_EOI, "STORE_EOI" },
{ XIVE_IRQ_FLAG_LSI, "LSI" },
{ XIVE_IRQ_FLAG_SHIFT_BUG, "SHIFT_BUG" },
{ XIVE_IRQ_FLAG_MASK_FW, "MASK_FW" },
{ XIVE_IRQ_FLAG_EOI_FW, "EOI_FW" },
{ XIVE_IRQ_FLAG_H_INT_ESB, "H_INT_ESB" },
{ XIVE_IRQ_FLAG_NO_EOI, "NO_EOI" },
};
static void xive_irq_domain_debug_show(struct seq_file *m, struct irq_domain *d,
struct irq_data *irqd, int ind)
{
struct xive_irq_data *xd;
u64 val;
int i;
/* No IRQ domain level information. To be done */
if (!irqd)
return;
if (!is_xive_irq(irq_data_get_irq_chip(irqd)))
return;
seq_printf(m, "%*sXIVE:\n", ind, "");
ind++;
xd = irq_data_get_irq_handler_data(irqd);
if (!xd) {
seq_printf(m, "%*snot assigned\n", ind, "");
return;
}
val = xive_esb_read(xd, XIVE_ESB_GET);
seq_printf(m, "%*sESB: %s\n", ind, "", esb_names[val & 0x3]);
seq_printf(m, "%*sPstate: %s %s\n", ind, "", xd->stale_p ? "stale" : "",
xd->saved_p ? "saved" : "");
seq_printf(m, "%*sTarget: %d\n", ind, "", xd->target);
seq_printf(m, "%*sChip: %d\n", ind, "", xd->src_chip);
seq_printf(m, "%*sTrigger: 0x%016llx\n", ind, "", xd->trig_page);
seq_printf(m, "%*sEOI: 0x%016llx\n", ind, "", xd->eoi_page);
seq_printf(m, "%*sFlags: 0x%llx\n", ind, "", xd->flags);
for (i = 0; i < ARRAY_SIZE(xive_irq_flags); i++) {
if (xd->flags & xive_irq_flags[i].mask)
seq_printf(m, "%*s%s\n", ind + 12, "", xive_irq_flags[i].name);
}
}
#endif
static const struct irq_domain_ops xive_irq_domain_ops = {
.match = xive_irq_domain_match,
.map = xive_irq_domain_map,
.unmap = xive_irq_domain_unmap,
.xlate = xive_irq_domain_xlate,
#ifdef CONFIG_GENERIC_IRQ_DEBUGFS
.debug_show = xive_irq_domain_debug_show,
#endif
};
static void __init xive_init_host(struct device_node *np)