[PATCH 07/11] powerpc/xive: Add a debugfs file to dump EQs

[Cédric Le Goater]

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 at kaod.org>
---
 arch/powerpc/sysdev/xive/common.c | 37 +++++++++++++++++++++++++++++++
 1 file changed, 37 insertions(+)

diff --git a/arch/powerpc/sysdev/xive/common.c b/arch/powerpc/sysdev/xive/common.c
index c5167f284da5..75c683ffae7e 100644
--- a/arch/powerpc/sysdev/xive/common.c
+++ b/arch/powerpc/sysdev/xive/common.c
@@ -1775,9 +1775,40 @@ 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))
@@ -1787,6 +1818,12 @@ 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);
+	}
 }
 
 #endif /* CONFIG_DEBUG_FS */
-- 
2.31.1