From: Will Deacon <will@kernel.org>
To: John Stultz <john.stultz@linaro.org>
Cc: Marc Zyngier <maz@kernel.org>,
lkml <linux-kernel@vger.kernel.org>,
Andy Gross <agross@kernel.org>,
Bjorn Andersson <bjorn.andersson@linaro.org>,
Joerg Roedel <joro@8bytes.org>,
Thomas Gleixner <tglx@linutronix.de>,
Jason Cooper <jason@lakedaemon.net>,
Linus Walleij <linus.walleij@linaro.org>,
Lina Iyer <ilina@codeaurora.org>,
Saravana Kannan <saravanak@google.com>,
Todd Kjos <tkjos@google.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-arm-msm <linux-arm-msm@vger.kernel.org>,
iommu@lists.linux-foundation.org, linux-gpio@vger.kernel.org
Subject: Re: [RFC][PATCH 5/5] firmware: QCOM_SCM: Allow qcom_scm driver to be loadable as a permenent module
Date: Fri, 3 Jul 2020 13:23:44 +0100 [thread overview]
Message-ID: <20200703122343.GB18652@willie-the-truck> (raw)
In-Reply-To: <CALAqxLUZBdiLBRcp1GW9rGxt1KhgNVQ86MuPXZcXdx2wFLZk6w@mail.gmail.com>
On Tue, Jun 16, 2020 at 01:52:32PM -0700, John Stultz wrote:
> On Tue, Jun 16, 2020 at 12:55 AM Marc Zyngier <maz@kernel.org> wrote:
> > On 2020-06-16 07:13, John Stultz wrote:
> > > diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
> > > index b510f67dfa49..714893535dd2 100644
> > > --- a/drivers/iommu/Kconfig
> > > +++ b/drivers/iommu/Kconfig
> > > @@ -381,6 +381,7 @@ config SPAPR_TCE_IOMMU
> > > config ARM_SMMU
> > > tristate "ARM Ltd. System MMU (SMMU) Support"
> > > depends on (ARM64 || ARM || (COMPILE_TEST && !GENERIC_ATOMIC64)) &&
> > > MMU
> > > + depends on QCOM_SCM || !QCOM_SCM #if QCOM_SCM=m this can't be =y
> >
> > This looks a bit ugly. Could you explain why we need this at the SMMU
> > level? I'd have expected the dependency to flow the other way around...
>
> Yea, so the arm-smmu-qcom.c file calls directly into the qcom-scm code
> via qcom_scm_qsmmu500_wait_safe_toggle()
> https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/iommu/arm-smmu-qcom.c?h=v5.8-rc1#n44
>
> So if ARM_SMMU=y and QCOM_SCM=m we get:
> drivers/iommu/arm-smmu-qcom.o: In function `qcom_smmu500_reset':
> arm-smmu-qcom.c:(.text+0xb4): undefined reference to
> `qcom_scm_qsmmu500_wait_safe_toggle'
>
> Do you have a suggestion for an alternative approach?
Can you use symbol_get() or something like that? How are module dependencies
handled by other drivers?
Will
next prev parent reply other threads:[~2020-07-03 12:23 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-06-16 6:13 [RFC][PATCH 0/5] Allow for qcom-pdc, pinctrl-msm and qcom-scm drivers to be loadable as modules John Stultz
2020-06-16 6:13 ` [RFC][PATCH 1/5] irq: irqdomain: Export irq_domain_update_bus_token John Stultz
2020-06-16 6:13 ` [RFC][PATCH 2/5] irq: irqchip: Export irq_chip_retrigger_hierarchy and irq_chip_set_vcpu_affinity_parent John Stultz
2020-06-16 6:13 ` [RFC][PATCH 3/5] irqchip: Allow QCOM_PDC to be loadable as a perment module John Stultz
2020-06-16 11:29 ` Maulik Shah
2020-06-16 16:08 ` Lina Iyer
2020-06-16 21:21 ` John Stultz
2020-06-16 6:13 ` [RFC][PATCH 4/5] pinctrl: qcom: Allow pinctrl-msm code to be loadable as a module John Stultz
2020-06-20 21:21 ` Linus Walleij
2020-06-21 6:00 ` Bjorn Andersson
2020-06-24 23:22 ` John Stultz
2020-06-16 6:13 ` [RFC][PATCH 5/5] firmware: QCOM_SCM: Allow qcom_scm driver to be loadable as a permenent module John Stultz
2020-06-16 7:55 ` Marc Zyngier
2020-06-16 20:52 ` John Stultz
2020-07-03 12:23 ` Will Deacon [this message]
2020-07-03 12:49 ` Vinod Koul
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=20200703122343.GB18652@willie-the-truck \
--to=will@kernel.org \
--cc=agross@kernel.org \
--cc=bjorn.andersson@linaro.org \
--cc=gregkh@linuxfoundation.org \
--cc=ilina@codeaurora.org \
--cc=iommu@lists.linux-foundation.org \
--cc=jason@lakedaemon.net \
--cc=john.stultz@linaro.org \
--cc=joro@8bytes.org \
--cc=linus.walleij@linaro.org \
--cc=linux-arm-msm@vger.kernel.org \
--cc=linux-gpio@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=maz@kernel.org \
--cc=saravanak@google.com \
--cc=tglx@linutronix.de \
--cc=tkjos@google.com \
/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).