linux-kernel - [PATCH 5/6] iommu: document missing def_domain

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Message-ID: <20241209192403.107090-6-mjrosato@linux.ibm.com>
Date: Mon,  9 Dec 2024 14:24:02 -0500
From: Matthew Rosato <mjrosato@...ux.ibm.com>
To: joro@...tes.org, will@...nel.org, robin.murphy@....com,
        gerald.schaefer@...ux.ibm.com, schnelle@...ux.ibm.com
Cc: hca@...ux.ibm.com, gor@...ux.ibm.com, agordeev@...ux.ibm.com,
        svens@...ux.ibm.com, borntraeger@...ux.ibm.com, farman@...ux.ibm.com,
        clegoate@...hat.com, iommu@...ts.linux.dev,
        linux-kernel@...r.kernel.org, linux-s390@...r.kernel.org
Subject: [PATCH 5/6] iommu: document missing def_domain_type return

In addition to IOMMU_DOMAIN_DMA, def_domain_type can also return
IOMMU_DOMAIN_DMA_FQ when applicable, else flush queues will never be
used.

Signed-off-by: Matthew Rosato <mjrosato@...ux.ibm.com>
---
 include/linux/iommu.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 05279109c732..d0da1918d2de 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -585,6 +585,7 @@ iommu_copy_struct_from_full_user_array(void *kdst, size_t kdst_entry_size,
  * @def_domain_type: device default domain type, return value:
  *		- IOMMU_DOMAIN_IDENTITY: must use an identity domain
  *		- IOMMU_DOMAIN_DMA: must use a dma domain
+ *              - IOMMU_DOMAIN_DMA_FQ: dma domain with batch invalidation
  *		- 0: use the default setting
  * @default_domain_ops: the default ops for domains
  * @remove_dev_pasid: Remove any translation configurations of a specific
-- 
2.47.0