From: Nicolin Chen <nicolinc@nvidia.com>
To: Qinxin Xia <xiaqinxin@huawei.com>
Cc: <robin.murphy@arm.com>, <will@kernel.org>, <jpb@kernel.org>,
<linux-arm-kernel@lists.infradead.org>, <iommu@lists.linux.dev>,
<wangzhou1@hisilicon.com>, <prime.zeng@hisilicon.com>,
<fanghao11@huawei.com>, <jonathan.cameron@huawei.com>,
<wuyifan50@huawei.com>, <linuxarm@huawei.com>,
<linux-kernel@vger.kernel.org>
Subject: Re: [PATCH 5/5] iommu/arm-smmu-v3: Add Context Descriptor display to debugfs
Date: Tue, 26 May 2026 19:40:33 -0700 [thread overview]
Message-ID: <ahZZoT3tIP9jfp1d@Asurada-Nvidia> (raw)
In-Reply-To: <20260520063714.2440584-5-xiaqinxin@huawei.com>
On Wed, May 20, 2026 at 02:37:11PM +0800, Qinxin Xia wrote:
> +static int smmu_debugfs_cd_show(struct seq_file *seq, void *unused)
> +{
> + struct device *dev = seq->private;
> + struct arm_smmu_master *master;
> + u32 max_ssids, ssid;
> +
> + guard(mutex)(&arm_smmu_asid_lock);
> +
> + master = dev_iommu_priv_get(dev);
> + if (!master) {
> + seq_puts(seq, "No master data\n");
> + return 0;
> + }
arm_smmu_asid_lock fences against domain attachments, required
by CD (yes). But, it doesn't fence against a device unplug. So
this might need both streams_mutex and asid_lock.
Nicolin
next prev parent reply other threads:[~2026-05-27 2:41 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-03-28 10:17 [RFC PATCH v2 0/5] Add debugfs support for ARM SMMUv3 Qinxin Xia
2026-05-20 6:37 ` [PATCH " Qinxin Xia
2026-03-28 10:17 ` [RFC PATCH v2 1/5] iommu/arm-smmu-v3: Add basic debugfs framework Qinxin Xia
2026-03-30 10:46 ` Nicolin Chen
2026-04-02 3:50 ` Qinxin Xia
2026-03-28 10:17 ` [RFC PATCH v2 2/5] iommu/arm-smmu-v3: Add register display to debugfs Qinxin Xia
2026-03-30 11:25 ` Nicolin Chen
2026-03-28 10:17 ` [RFC PATCH v2 3/5] iommu/arm-smmu-v3: Add Stream Table Entry " Qinxin Xia
2026-04-04 5:43 ` Nicolin Chen
2026-03-28 10:17 ` [RFC PATCH v2 4/5] iommu/arm-smmu-v3: Add device symlink in stream table debugfs Qinxin Xia
2026-03-28 10:17 ` [RFC PATCH v2 5/5] iommu/arm-smmu-v3: Add Context Descriptor display to debugfs Qinxin Xia
2026-05-20 6:37 ` [PATCH 1/5] iommu/arm-smmu-v3: Add basic debugfs framework Qinxin Xia
2026-05-27 0:41 ` Nicolin Chen
2026-05-20 6:37 ` [PATCH 2/5] iommu/arm-smmu-v3: Add register display to debugfs Qinxin Xia
2026-05-27 1:28 ` Nicolin Chen
2026-05-20 6:37 ` [PATCH 3/5] iommu/arm-smmu-v3: Add Stream Table Entry " Qinxin Xia
2026-05-27 2:18 ` Nicolin Chen
2026-05-27 2:43 ` Nicolin Chen
2026-05-20 6:37 ` [PATCH 4/5] iommu/arm-smmu-v3: Add device symlink in stream table debugfs Qinxin Xia
2026-05-20 6:37 ` [PATCH 5/5] iommu/arm-smmu-v3: Add Context Descriptor display to debugfs Qinxin Xia
2026-05-27 2:40 ` Nicolin Chen [this message]
2026-05-27 0:07 ` [PATCH 0/5] Add debugfs support for ARM SMMUv3 Nicolin Chen
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=ahZZoT3tIP9jfp1d@Asurada-Nvidia \
--to=nicolinc@nvidia.com \
--cc=fanghao11@huawei.com \
--cc=iommu@lists.linux.dev \
--cc=jonathan.cameron@huawei.com \
--cc=jpb@kernel.org \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
--cc=linuxarm@huawei.com \
--cc=prime.zeng@hisilicon.com \
--cc=robin.murphy@arm.com \
--cc=wangzhou1@hisilicon.com \
--cc=will@kernel.org \
--cc=wuyifan50@huawei.com \
--cc=xiaqinxin@huawei.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 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.