From: will.deacon@arm.com (Will Deacon)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH v3 3/5] iommu/arm-smmu: provide option to dsb macro when publishing tables
Date: Wed, 19 Feb 2014 12:28:35 +0000 [thread overview]
Message-ID: <1392812917-29302-3-git-send-email-will.deacon@arm.com> (raw)
In-Reply-To: <1392812917-29302-1-git-send-email-will.deacon@arm.com>
On coherent systems, publishing new page tables to the SMMU walker is
achieved with a dsb instruction. In fact, this can be a dsb(ishst) which
also provides the mandatory barrier option for arm64.
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
---
drivers/iommu/arm-smmu.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
index 8911850c9444..8f6fee54f3b1 100644
--- a/drivers/iommu/arm-smmu.c
+++ b/drivers/iommu/arm-smmu.c
@@ -1417,7 +1417,7 @@ out_unlock:
/* Ensure new page tables are visible to the hardware walker */
if (smmu->features & ARM_SMMU_FEAT_COHERENT_WALK)
- dsb();
+ dsb(ishst);
return ret;
}
--
1.8.2.2
next prev parent reply other threads:[~2014-02-19 12:28 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-02-19 12:28 [PATCH v3 1/5] arm64: barriers: make use of barrier options with explicit barriers Will Deacon
2014-02-19 12:28 ` [PATCH v3 2/5] irqchip: gic: use dmb ishst instead of dsb when raising a softirq Will Deacon
2014-02-19 12:32 ` Catalin Marinas
2014-02-19 13:21 ` Marc Zyngier
2014-02-19 12:28 ` Will Deacon [this message]
2014-02-19 12:28 ` [PATCH v3 4/5] arm64: barriers: wire up new barrier options Will Deacon
2014-02-19 12:28 ` [PATCH v3 5/5] arm64: barriers: use barrier() instead of smp_mb() when !SMP Will Deacon
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=1392812917-29302-3-git-send-email-will.deacon@arm.com \
--to=will.deacon@arm.com \
--cc=linux-arm-kernel@lists.infradead.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 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).