linux-kernel - [PATCH RFCv2 08/13] iommu: Turn iova_cookie to dma-iommu private pointer

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Message-ID: <42c6ff3090636146a86501528eb03df99f83381c.1736550979.git.nicolinc@nvidia.com>
Date: Fri, 10 Jan 2025 19:32:24 -0800
From: Nicolin Chen <nicolinc@...dia.com>
To: <will@...nel.org>, <robin.murphy@....com>, <jgg@...dia.com>,
	<kevin.tian@...el.com>, <tglx@...utronix.de>, <maz@...nel.org>,
	<alex.williamson@...hat.com>
CC: <joro@...tes.org>, <shuah@...nel.org>, <reinette.chatre@...el.com>,
	<eric.auger@...hat.com>, <yebin10@...wei.com>, <apatel@...tanamicro.com>,
	<shivamurthy.shastri@...utronix.de>, <bhelgaas@...gle.com>,
	<anna-maria@...utronix.de>, <yury.norov@...il.com>, <nipun.gupta@....com>,
	<iommu@...ts.linux.dev>, <linux-kernel@...r.kernel.org>,
	<linux-arm-kernel@...ts.infradead.org>, <kvm@...r.kernel.org>,
	<linux-kselftest@...r.kernel.org>, <patches@...ts.linux.dev>,
	<jean-philippe@...aro.org>, <mdf@...nel.org>, <mshavit@...gle.com>,
	<shameerali.kolothum.thodi@...wei.com>, <smostafa@...gle.com>,
	<ddutile@...hat.com>
Subject: [PATCH RFCv2 08/13] iommu: Turn iova_cookie to dma-iommu private pointer

Now, iommufd has its own iommufd_sw_msi using iommufd_hwpt, the iommufd
owned domain's private pointer. Similarly, iova_cookie can be seen as a
dma-iommu owned domain's private pointer. So, move iova_cookie into the
union.

Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
---
 include/linux/iommu.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index b6526d734f30..284c40fe0e12 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -216,7 +216,6 @@ struct iommu_domain {
 	const struct iommu_ops *owner; /* Whose domain_alloc we came from */
 	unsigned long pgsize_bitmap;	/* Bitmap of page sizes in use */
 	struct iommu_domain_geometry geometry;
-	struct iommu_dma_cookie *iova_cookie;
 	int (*iopf_handler)(struct iopf_group *group);
 
 #if IS_ENABLED(CONFIG_IRQ_MSI_IOMMU)
@@ -225,6 +224,7 @@ struct iommu_domain {
 #endif
 
 	union { /* Pointer usable by owner of the domain */
+		struct iommu_dma_cookie *iova_cookie; /* dma-iommu */
 		struct iommufd_hw_pagetable *iommufd_hwpt; /* iommufd */
 	};
 	union { /* Fault handler */
-- 
2.43.0