From: Pierre-Loup Gosse <pierre-loup.gosse@smile.fr>
To: xenomai@xenomai.org
Subject: ipipe: IRQ not received on i.MX8 (linux-imx)
Date: Mon, 5 Jul 2021 09:10:58 +0200 [thread overview]
Message-ID: <a57774b8-46af-5db9-1ab4-163210bc1396@smile.fr> (raw)
Hi,
For a client project I try to port Xenomai 3.1 + I-pipe to the kernel
linux-imx 5.4.70 for arm64 (i.MX8 Mini). I adapted the I-pipe patch
(5.4.72-arm64). The kernel boots and works well.
However, for the non-regression test, I run a client test that uses
Xenomai and UDD (to register a PCIe driver). The test waits for a
hardware IRQ from a PCIe device. This IRQ is never received which lead
the test to fail. To be more precise, after running the test, Xenomai
show that no IRQs was received for this device:
# cat /proc/xenomai/irq
IRQ CPU0 CPU1 CPU2 CPU3
3: 4027 14050 3708 4488 [timer/0]
**223: 0 0 0 0 netx00
1031: 0 0 0 0 [sync]
1032: 1 1 1 0 [timer-ipi]
1033: 0 0 0 0 [reschedule]
1037: 0 44 0 0 [virtual]
'netx00' is our device with the IRQ 223.
/proc/xenomai/irq simply reads the irqall counter per CPU per IRQ
(/__ipipe_cpudata_irq_hits/). This means that no IRQ 223 went through
the I-pipe, or worse, not even sent.
But in comparison, I reproduced this test with the old client image
(Xenomai 3.1 + I-pipe on the kernel linux-imx 4.14.98) on the same
hardware (arm64 i.MX8 Mini). The test passed and Xenomai received IRQs
for 'next00'.
This leads me to the conclusion that on the new kernel our IRQ is sent
but does not pass through the I-pipe.
I noticed that some irq handler functions from driver do not use the
/ipipe_handle_domain_irq/ or /ipipe_handle_demuxed_irq/ but the generic
function, respectively /handle_domain_irq/ and /generic_handle_irq/.
Especially for the imx irqchip (_drivers/irqchip/irq-imx-intmux.c_ and
_drivers/irqchip/irq-imx-irqsteer.c_). I patched these files to use
/ipipe_handle_demuxed_irq/ rather than /generic_handle_irq/. But
/proc/xenomai/irq still shows 0 IRQs and the test still fails.
Am I doing things right ? Or am I missing something ?
Best regards,
--
Pierre-Loup.
next reply other threads:[~2021-07-05 7:10 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-05 7:10 Pierre-Loup Gosse [this message]
2021-07-05 11:02 ` ipipe: IRQ not received on i.MX8 (linux-imx) Jan Kiszka
2021-07-06 1:37 ` Greg Gallagher
2021-07-06 13:40 ` Pierre-Loup Gosse
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=a57774b8-46af-5db9-1ab4-163210bc1396@smile.fr \
--to=pierre-loup.gosse@smile.fr \
--cc=xenomai@xenomai.org \
/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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.