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From: Joerg Roedel <joro@8bytes.org>
To: Lu Baolu <baolu.lu@linux.intel.com>
Cc: Will Deacon <will@kernel.org>,
	Robin Murphy <robin.murphy@arm.com>,
	Jason Gunthorpe <jgg@ziepe.ca>, Kevin Tian <kevin.tian@intel.com>,
	iommu@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/1] iommu: Avoid unnecessary cache invalidations
Date: Fri, 27 Oct 2023 08:57:36 +0200	[thread overview]
Message-ID: <ZTtfYPenwmd6W3nX@8bytes.org> (raw)
In-Reply-To: <20231026084942.17387-1-baolu.lu@linux.intel.com>

On Thu, Oct 26, 2023 at 04:49:42PM +0800, Lu Baolu wrote:
> The iommu_create_device_direct_mappings() only needs to flush the caches
> when the mappings are changed in the affected domain. This is not true
> for non-DMA domains, or for devices attached to the domain that have no
> reserved regions. To avoid unnecessary cache invalidations, add a check
> before iommu_flush_iotlb_all().
> 
> Fixes: a48ce36e2786 ("iommu: Prevent RESV_DIRECT devices from blocking domains")
> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
> ---
>  drivers/iommu/iommu.c | 3 ++-
>  1 file changed, 2 insertions(+), 1 deletion(-)

Applied, thanks.

      parent reply	other threads:[~2023-10-27  6:57 UTC|newest]

Thread overview: 3+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-10-26  8:49 [PATCH 1/1] iommu: Avoid unnecessary cache invalidations Lu Baolu
2023-10-27  4:30 ` Henry Willard
2023-10-27  6:57 ` Joerg Roedel [this message]

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