powerpc/xive: Add a debugfs file to dump internal XIVE state (930914b7) · Commits · 戴 / test

arch/powerpc/sysdev/xive/common.c

+105 −0

Original line number	Diff line number	Diff line
		@@ -20,6 +20,7 @@
		#include <linux/spinlock.h>
		#include <linux/msi.h>

		#include <asm/debugfs.h>
		#include <asm/prom.h>
		#include <asm/io.h>
		#include <asm/smp.h>
		@@ -1555,3 +1556,107 @@ static int __init xive_off(char *arg)
		return 0;
		}
		__setup("xive=off", xive_off);

		void xive_debug_show_cpu(struct seq_file *m, int cpu)
		{
		struct xive_cpu *xc = per_cpu(xive_cpu, cpu);

		seq_printf(m, "CPU %d:", cpu);
		if (xc) {
		seq_printf(m, "pp=%02x CPPR=%02x ", xc->pending_prio, xc->cppr);

		#ifdef CONFIG_SMP
		{
		u64 val = xive_esb_read(&xc->ipi_data, XIVE_ESB_GET);

		seq_printf(m, "IPI=0x%08x PQ=%c%c ", xc->hw_ipi,
		val & XIVE_ESB_VAL_P ? 'P' : '-',
		val & XIVE_ESB_VAL_Q ? 'Q' : '-');
		}
		#endif
		{
		struct xive_q *q = &xc->queue[xive_irq_priority];
		u32 i0, i1, idx;

		if (q->qpage) {
		idx = q->idx;
		i0 = be32_to_cpup(q->qpage + idx);
		idx = (idx + 1) & q->msk;
		i1 = be32_to_cpup(q->qpage + idx);
		seq_printf(m, "EQ idx=%d T=%d %08x %08x ...",
		q->idx, q->toggle, i0, i1);
		}
		}
		}
		seq_puts(m, "\n");
		}

		void xive_debug_show_irq(struct seq_file m, u32 hw_irq, struct irq_data d)
		{
		struct irq_chip *chip = irq_data_get_irq_chip(d);
		int rc;
		u32 target;
		u8 prio;
		u32 lirq;

		if (!is_xive_irq(chip))
		return;

		rc = xive_ops->get_irq_config(hw_irq, &target, &prio, &lirq);
		if (rc) {
		seq_printf(m, "IRQ 0x%08x : no config rc=%d\n", hw_irq, rc);
		return;
		}

		seq_printf(m, "IRQ 0x%08x : target=0x%x prio=%02x lirq=0x%x ",
		hw_irq, target, prio, lirq);

		if (d) {
		struct xive_irq_data *xd = irq_data_get_irq_handler_data(d);
		u64 val = xive_esb_read(xd, XIVE_ESB_GET);

		seq_printf(m, "flags=%c%c%c PQ=%c%c",
		xd->flags & XIVE_IRQ_FLAG_STORE_EOI ? 'S' : ' ',
		xd->flags & XIVE_IRQ_FLAG_LSI ? 'L' : ' ',
		xd->flags & XIVE_IRQ_FLAG_H_INT_ESB ? 'H' : ' ',
		val & XIVE_ESB_VAL_P ? 'P' : '-',
		val & XIVE_ESB_VAL_Q ? 'Q' : '-');
		}
		seq_puts(m, "\n");
		}

		static int xive_core_debug_show(struct seq_file m, void private)
		{
		unsigned int i;
		struct irq_desc *desc;
		int cpu;

		if (xive_ops->debug_show)
		xive_ops->debug_show(m, private);

		for_each_possible_cpu(cpu)
		xive_debug_show_cpu(m, cpu);

		for_each_irq_desc(i, desc) {
		struct irq_data *d = irq_desc_get_irq_data(desc);
		unsigned int hw_irq;

		if (!d)
		continue;

		hw_irq = (unsigned int)irqd_to_hwirq(d);

		/* IPIs are special (HW number 0) */
		if (hw_irq)
		xive_debug_show_irq(m, hw_irq, d);
		}
		return 0;
		}
		DEFINE_SHOW_ATTRIBUTE(xive_core_debug);

		int xive_core_debug_init(void)
		{
		debugfs_create_file("xive", 0400, powerpc_debugfs_root,
		NULL, &xive_core_debug_fops);
		return 0;
		}

arch/powerpc/sysdev/xive/native.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -19,6 +19,7 @@
		#include <linux/cpumask.h>
		#include <linux/mm.h>

		#include <asm/machdep.h>
		#include <asm/prom.h>
		#include <asm/io.h>
		#include <asm/smp.h>
		@@ -850,3 +851,5 @@ int xive_native_get_vp_state(u32 vp_id, u64 *out_state)
		return 0;
		}
		EXPORT_SYMBOL_GPL(xive_native_get_vp_state);

		machine_arch_initcall(powernv, xive_core_debug_init);

arch/powerpc/sysdev/xive/spapr.c

+19 −0

Original line number	Diff line number	Diff line
		@@ -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);

arch/powerpc/sysdev/xive/xive-internal.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -57,12 +57,14 @@ struct xive_ops {
		int (get_ipi)(unsigned int cpu, struct xive_cpu xc);
		void (put_ipi)(unsigned int cpu, struct xive_cpu xc);
		#endif
		int (debug_show)(struct seq_file m, void *private);
		const char *name;
		};

		bool xive_core_init(const struct xive_ops ops, void __iomem area, u32 offset,
		u8 max_prio);
		__be32 *xive_queue_page_alloc(unsigned int cpu, u32 queue_shift);
		int xive_core_debug_init(void);

		static inline u32 xive_alloc_order(u32 queue_shift)
		{

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