linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Harvey Hunt <harvey.hunt@imgtec.com>
To: <tglx@linutronix.de>, <jason@lakedaemon.net>, <marc.zyngier@arm.com>
Cc: Harvey Hunt <harvey.hunt@imgtec.com>, <linux-mips@linux-mips.org>,
	<linux-kernel@vger.kernel.org>, Qais Yousef <qsyousef@gmail.com>
Subject: [PATCH] irqchip/mips-gic: Fix IRQs in gic_dev_domain
Date: Mon, 23 May 2016 12:05:52 +0100	[thread overview]
Message-ID: <1464001552-31174-1-git-send-email-harvey.hunt@imgtec.com> (raw)

When allocating a new device IRQ, gic_dev_domain_alloc() correctly calls
irq_domain_set_hwirq_and_chip(), but gic_irq_domain_alloc() does not. This
means that gic_irq_domain believes all IRQs from the dev domain have an
hwirq of 0 and creates incorrect mappings in the linear_revmap. As
gic_irq_domain is a parent of the gic_dev_domain, this leads to an
inability to boot on devices with a GIC. Excerpt of the error:

[    2.297649] irq 0: nobody cared (try booting with the "irqpoll" option)
...
[    2.436963] handlers:
[    2.439492] Disabling IRQ #0

Fix this by calling irq_domain_set_hwirq_and_chip() for both the dev and
irq domain.

Now that we are modifying the parent domain, be sure to clear it up in
case of an allocation error.

Fixes: c98c1822ee13 ("irqchip/mips-gic: Add device hierarchy domain")
Fixes: 2af70a962070 ("irqchip/mips-gic: Add a IPI hierarchy domain")
Signed-off-by: Harvey Hunt <harvey.hunt@imgtec.com>
Tested-by: Govindraj Raja <Govindraj.Raja@imgtec.com> # On Pistachio SoC
Reviewed-by: Matt Redfearn <matt.redfearn@imgtec.com>
Cc: <linux-mips@linux-mips.org>
Cc: <linux-kernel@vger.kernel.org>
Cc: Qais Yousef <qsyousef@gmail.com>
---
 drivers/irqchip/irq-mips-gic.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-mips-gic.c b/drivers/irqchip/irq-mips-gic.c
index 4dffccf..40fb120 100644
--- a/drivers/irqchip/irq-mips-gic.c
+++ b/drivers/irqchip/irq-mips-gic.c
@@ -734,6 +734,12 @@ static int gic_irq_domain_alloc(struct irq_domain *d, unsigned int virq,
 		/* verify that it doesn't conflict with an IPI irq */
 		if (test_bit(spec->hwirq, ipi_resrv))
 			return -EBUSY;
+
+		hwirq = GIC_SHARED_TO_HWIRQ(spec->hwirq);
+
+		return irq_domain_set_hwirq_and_chip(d, virq, hwirq,
+						     &gic_level_irq_controller,
+						     NULL);
 	} else {
 		base_hwirq = find_first_bit(ipi_resrv, gic_shared_intrs);
 		if (base_hwirq == gic_shared_intrs) {
@@ -855,10 +861,14 @@ static int gic_dev_domain_alloc(struct irq_domain *d, unsigned int virq,
 						    &gic_level_irq_controller,
 						    NULL);
 		if (ret)
-			return ret;
+			goto error;
 	}
 
 	return 0;
+
+error:
+	irq_domain_free_irqs_parent(d, virq, nr_irqs);
+	return ret;
 }
 
 void gic_dev_domain_free(struct irq_domain *d, unsigned int virq,
-- 
2.8.2

             reply	other threads:[~2016-05-23 11:06 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-05-23 11:05 Harvey Hunt [this message]
2016-06-14  9:46 ` [tip:irq/urgent] irqchip/mips-gic: Fix IRQs in gic_dev_domain tip-bot for Harvey Hunt
     [not found] ` <CA+mqd+7mh3v-1mk4xpxBjxtt4_JjycisWj6VnV7AaOH=i=y3Qw@mail.gmail.com>
2016-06-23 18:11   ` [PATCH] " Jason Cooper
2016-06-25  8:58     ` Thomas Gleixner
2016-06-25  9:14     ` Qais Yousef

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=1464001552-31174-1-git-send-email-harvey.hunt@imgtec.com \
    --to=harvey.hunt@imgtec.com \
    --cc=jason@lakedaemon.net \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mips@linux-mips.org \
    --cc=marc.zyngier@arm.com \
    --cc=qsyousef@gmail.com \
    --cc=tglx@linutronix.de \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).