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From: "Mehta, Sohil" <sohil.mehta@intel.com>
To: "gary.hook@amd.com" <gary.hook@amd.com>,
	"iommu@lists.linux-foundation.org"
	<iommu@lists.linux-foundation.org>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3 2/2] iommu/amd: Add basic debugfs infrastructure for AMD IOMMU
Date: Sat, 14 Apr 2018 00:08:55 +0000	[thread overview]
Message-ID: <1523664612.2747.13.camel@intel.com> (raw)
In-Reply-To: <152302067362.47565.628887796165116844.stgit@sosxen2.amd.com>

On Fri, 2018-04-06 at 08:17 -0500, Gary R Hook wrote:
> 
> +
> +void amd_iommu_debugfs_setup(struct amd_iommu *iommu)
> +{
> +	char name[MAX_NAME_LEN + 1];
> +	struct dentry *d_top;
> +
> +	if (!debugfs_initialized())

Probably not needed.

> +		return;
> +
> +	mutex_lock(&amd_iommu_debugfs_lock);
> +	if (!amd_iommu_debugfs) {
> +		d_top = iommu_debugfs_setup();
> +		if (d_top)
> +			amd_iommu_debugfs =
> debugfs_create_dir("amd", d_top);
> +	}
> +	mutex_unlock(&amd_iommu_debugfs_lock);


You can do the above only once if you iterate over the IOMMUs here
 instead of doing it in amd_iommu_init.

> +	if (amd_iommu_debugfs) {
> +		snprintf(name, MAX_NAME_LEN, "iommu%02d", iommu-
> >index);
> +		iommu->debugfs = debugfs_create_dir(name,
> +						    amd_iommu_debugf
> s);
> +		if (!iommu->debugfs) {
> +			debugfs_remove_recursive(amd_iommu_debugfs);
> +			amd_iommu_debugfs = NULL;
> +		}
> +	}
> +}

-Sohil

  reply	other threads:[~2018-04-14  0:09 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-04-06 13:17 [PATCH v3 0/2] Base enablement of IOMMU debugfs support Gary R Hook
2018-04-06 13:17 ` [PATCH v3 1/2] iommu - Enable debugfs exposure of the IOMMU Gary R Hook
2018-04-13 23:55   ` Mehta, Sohil
2018-04-17 17:36     ` Hook, Gary
2018-04-17 17:55       ` Robin Murphy
2018-04-17 18:06         ` Hook, Gary
2018-04-17 17:46   ` Hook, Gary
2018-04-17 18:13     ` Robin Murphy
2018-04-06 13:17 ` [PATCH v3 2/2] iommu/amd: Add basic debugfs infrastructure for AMD IOMMU Gary R Hook
2018-04-14  0:08   ` Mehta, Sohil [this message]
2018-04-17 17:38     ` Hook, Gary
2018-04-18  5:58       ` Yang, Shunyong
2018-04-18  7:27         ` Mehta, Sohil
2018-04-18  8:31           ` Yang, Shunyong
2018-04-18 20:16             ` Mehta, Sohil
2018-04-18 20:51               ` Hook, Gary
2018-04-19  1:52                 ` Yang, Shunyong
2018-04-30 19:57       ` Gary R Hook
2018-04-17  0:52   ` Mehta, Sohil
2018-04-17 17:42     ` Hook, Gary
2018-04-17 18:05       ` Robin Murphy

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