From: Oliver Upton <oupton@google.com>
To: linux-arm-kernel@lists.infradead.org
Cc: Marc Zyngier <maz@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Ricardo Koller <ricarkol@google.com>,
Reiji Watanabe <reijiw@google.com>
Subject: Re: [boot-wrapper PATCH] configure: Allow user to specify the counter frequency
Date: Wed, 16 Mar 2022 04:56:40 +0000 [thread overview]
Message-ID: <YjFuCN2za7ZGJRUl@google.com> (raw)
In-Reply-To: <20220224044947.980030-1-oupton@google.com>
On Thu, Feb 24, 2022 at 04:49:47AM +0000, Oliver Upton wrote:
> The default counter frequency on certain models is not actually 24MHz.
> For example, on the FVP Base RevC model, the default counter frequency
> is 100MHz, and is user configurable. Users testing against an ARMv8.6
> counter (1GHz) also need to override the default value.
>
> Add an optional configuration option which allows users to specify the
> counter frequency.
>
> Signed-off-by: Oliver Upton <oupton@google.com>
> ---
> Makefile.am | 1 -
> configure.ac | 8 ++++++++
> 2 files changed, 8 insertions(+), 1 deletion(-)
>
> diff --git a/Makefile.am b/Makefile.am
> index 08e304a..c71c601 100644
> --- a/Makefile.am
> +++ b/Makefile.am
> @@ -13,7 +13,6 @@ SCRIPT_DIR := $(top_srcdir)/scripts
> PHYS_OFFSET := $(shell perl -I $(SCRIPT_DIR) $(SCRIPT_DIR)/findmem.pl $(KERNEL_DTB))
> UART_BASE := $(shell perl -I $(SCRIPT_DIR) $(SCRIPT_DIR)/findbase.pl $(KERNEL_DTB) 0 'arm,pl011')
> SYSREGS_BASE := $(shell perl -I $(SCRIPT_DIR) $(SCRIPT_DIR)/findbase.pl $(KERNEL_DTB) 0 'arm,vexpress-sysreg' 2> /dev/null)
> -COUNTER_FREQ := 24000000
>
> CPU_IDS := $(shell perl -I $(SCRIPT_DIR) $(SCRIPT_DIR)/findcpuids.pl $(KERNEL_DTB))
> NR_CPUS := $(shell echo $(CPU_IDS) | tr ',' ' ' | wc -w)
> diff --git a/configure.ac b/configure.ac
> index 9e3b722..e7d086a 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -118,6 +118,13 @@ AC_ARG_ENABLE([gicv3],
> AM_CONDITIONAL([GICV3], [test "x$USE_GICV3" = "xyes"])
> AS_IF([test "x$USE_GICV3" = "xyes"], [], [USE_GICV3=no])
>
> +# Allow a user to set the exposed counter frequency
> +C_COUNTER_FREQ=24000000
> +AC_ARG_WITH([counter-frequency],
> + AS_HELP_STRING([--with-counter-frequency], [set counter frequency (in Hz)]),
> + [C_COUNTER_FREQ=$withval])
> +AC_SUBST([COUNTER_FREQ], [$C_COUNTER_FREQ])
> +
> # Ensure that we have all the needed programs
> AC_PROG_CC
> AC_PROG_CPP
> @@ -151,4 +158,5 @@ echo " Xen image ${XEN_IMAGE:-NONE}"
> if test "x${XEN_IMAGE}" != "x"; then
> echo " Xen command line: ${XEN_CMDLINE}"
> fi
> +echo " Counter frequency (Hz) ${COUNTER_FREQ}"
> echo ""
> --
> 2.35.1.473.g83b2b277ed-goog
>
Friendly ping :)
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
prev parent reply other threads:[~2022-03-16 4:58 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-24 4:49 [boot-wrapper PATCH] configure: Allow user to specify the counter frequency Oliver Upton
2022-03-16 4:56 ` Oliver Upton [this message]
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=YjFuCN2za7ZGJRUl@google.com \
--to=oupton@google.com \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=mark.rutland@arm.com \
--cc=maz@kernel.org \
--cc=reijiw@google.com \
--cc=ricarkol@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).