diff options
| author | Cédric Le Goater <clg@kaod.org> | 2020-12-10 20:14:43 +0300 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2020-12-11 01:53:10 +0300 |
| commit | a5021abc48a0f44083a15a37b3e61378519cb00d (patch) | |
| tree | 2a5492b610d32b9d88f0616df90ab4f1d3463f7a | |
| parent | 9dfe4b14df93532da3dbf11952a17389ae3cdc67 (diff) | |
| download | linux-a5021abc48a0f44083a15a37b3e61378519cb00d.tar.xz | |
powerpc/xive: Add a debug_show handler to the XIVE irq_domain
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
| -rw-r--r-- | arch/powerpc/sysdev/xive/common.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/arch/powerpc/sysdev/xive/common.c b/arch/powerpc/sysdev/xive/common.c index 8b1fe72a6a95..61a5f08798e9 100644 --- a/arch/powerpc/sysdev/xive/common.c +++ b/arch/powerpc/sysdev/xive/common.c @@ -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) |