From: Christophe Leroy <christophe.leroy@c-s.fr>
To: Ravi Bangoria <ravi.bangoria@linux.ibm.com>, mpe@ellerman.id.au
Cc: mikey@neuling.org, linuxppc-dev@lists.ozlabs.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] powerpc/watchpoint: Don't call dar_within_range() for Book3S
Date: Sat, 22 Feb 2020 11:26:08 +0000 [thread overview]
Message-ID: <d2aad6ea-5b61-7321-13a6-5faef361c57d@c-s.fr> (raw)
In-Reply-To: <20200222082049.330435-1-ravi.bangoria@linux.ibm.com>
On 02/22/2020 08:20 AM, Ravi Bangoria wrote:
> DAR is set to the first byte of overlap between actual access and
> watched range at DSI on Book3S processor. But actual access range
> might or might not be within user asked range. So for Book3S, it
> must not call dar_within_range().
>
> This revert portion of commit 39413ae00967 ("powerpc/hw_breakpoints:
> Rewrite 8xx breakpoints to allow any address range size.").
>
> Before patch:
> # ./tools/testing/selftests/powerpc/ptrace/perf-hwbreak
> ...
> TESTED: No overlap
> FAILED: Partial overlap: 0 != 2
> TESTED: Partial overlap
> TESTED: No overlap
> FAILED: Full overlap: 0 != 2
> failure: perf_hwbreak
>
> After patch:
> TESTED: No overlap
> TESTED: Partial overlap
> TESTED: Partial overlap
> TESTED: No overlap
> TESTED: Full overlap
> success: perf_hwbreak
>
> Fixes: 39413ae00967 ("powerpc/hw_breakpoints: Rewrite 8xx breakpoints to allow any address range size.")
Oh, this seems to have been introduced by 27985b2a640e
("powerpc/watchpoint: Don't ignore extraneous exceptions blindly").
I must have lost it through a rebase as we were doing our series
approximately at the same time, sorry for that.
Reviewed-by: Christophe Leroy <christophe.leroy@c-s.fr>
> Reported-by: Michael Ellerman <mpe@ellerman.id.au>
> Signed-off-by: Ravi Bangoria <ravi.bangoria@linux.ibm.com>
> ---
> arch/powerpc/kernel/hw_breakpoint.c | 12 +++++++-----
> 1 file changed, 7 insertions(+), 5 deletions(-)
>
> diff --git a/arch/powerpc/kernel/hw_breakpoint.c b/arch/powerpc/kernel/hw_breakpoint.c
> index 2462cd7c565c..d0854320bb50 100644
> --- a/arch/powerpc/kernel/hw_breakpoint.c
> +++ b/arch/powerpc/kernel/hw_breakpoint.c
> @@ -331,11 +331,13 @@ int hw_breakpoint_handler(struct die_args *args)
> }
>
> info->type &= ~HW_BRK_TYPE_EXTRANEOUS_IRQ;
> - if (!dar_within_range(regs->dar, info))
> - info->type |= HW_BRK_TYPE_EXTRANEOUS_IRQ;
> -
> - if (!IS_ENABLED(CONFIG_PPC_8xx) && !stepping_handler(regs, bp, info))
> - goto out;
> + if (IS_ENABLED(CONFIG_PPC_8xx)) {
> + if (!dar_within_range(regs->dar, info))
> + info->type |= HW_BRK_TYPE_EXTRANEOUS_IRQ;
> + } else {
> + if (!stepping_handler(regs, bp, info))
> + goto out;
> + }
>
> /*
> * As a policy, the callback is invoked in a 'trigger-after-execute'
>
next prev parent reply other threads:[~2020-02-22 11:29 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-02-22 8:20 [PATCH] powerpc/watchpoint: Don't call dar_within_range() for Book3S Ravi Bangoria
2020-02-22 11:26 ` Christophe Leroy [this message]
2020-02-22 13:16 ` Ravi Bangoria
2020-02-27 12:31 ` Michael Ellerman
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=d2aad6ea-5b61-7321-13a6-5faef361c57d@c-s.fr \
--to=christophe.leroy@c-s.fr \
--cc=linux-kernel@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=mikey@neuling.org \
--cc=mpe@ellerman.id.au \
--cc=ravi.bangoria@linux.ibm.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).