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From: Sven Peter via iommu <iommu@lists.linux-foundation.org>
To: iommu@lists.linux-foundation.org
Cc: Arnd Bergmann <arnd@kernel.org>, Sven Peter <sven@svenpeter.dev>,
	Will Deacon <will@kernel.org>, Hector Martin <marcan@marcan.st>,
	linux-kernel@vger.kernel.org, Alexander Graf <graf@amazon.com>,
	Mohamed Mediouni <mohamed.mediouni@caramail.com>,
	Robin Murphy <robin.murphy@arm.com>,
	Alyssa Rosenzweig <alyssa@rosenzweig.io>
Subject: [PATCH v2 7/8] iommu: Introduce __IOMMU_DOMAIN_LP
Date: Sat, 28 Aug 2021 17:36:41 +0200	[thread overview]
Message-ID: <20210828153642.19396-8-sven@svenpeter.dev> (raw)
In-Reply-To: <20210828153642.19396-1-sven@svenpeter.dev>

__IOMMU_DOMAIN_LP (large pages) indicates that a domain can handle
conditions where PAGE_SIZE might be smaller than the IOMMU page size.
Always allow attaching devices to such domains and set the flag for
IOMMU_DOMAIN_DMA, which can now handle these situations.

Signed-off-by: Sven Peter <sven@svenpeter.dev>
---
 drivers/iommu/iommu.c | 2 ++
 include/linux/iommu.h | 8 ++++++--
 2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index f02b727d3054..77d1ee14c7d0 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -1980,6 +1980,8 @@ static int iommu_check_page_size(struct iommu_domain *domain)
 {
 	if (!(domain->type & __IOMMU_DOMAIN_PAGING))
 		return 0;
+	if (domain->type & __IOMMU_DOMAIN_LP)
+		return 0;
 
 	if ((1 << __ffs(domain->pgsize_bitmap)) > PAGE_SIZE) {
 		pr_warn("IOMMU page size cannot represent CPU pages.\n");
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 6633040a13f9..40c1ad6be4e7 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -62,6 +62,8 @@ struct iommu_domain_geometry {
 					      implementation              */
 #define __IOMMU_DOMAIN_PT	(1U << 2)  /* Domain is identity mapped   */
 #define __IOMMU_DOMAIN_DMA_FQ	(1U << 3)  /* DMA-API uses flush queue    */
+#define __IOMMU_DOMAIN_LP	(1U << 4)  /* Support for PAGE_SIZE smaller
+					      than IOMMU page size        */
 
 /*
  * This are the possible domain-types
@@ -81,10 +83,12 @@ struct iommu_domain_geometry {
 #define IOMMU_DOMAIN_IDENTITY	(__IOMMU_DOMAIN_PT)
 #define IOMMU_DOMAIN_UNMANAGED	(__IOMMU_DOMAIN_PAGING)
 #define IOMMU_DOMAIN_DMA	(__IOMMU_DOMAIN_PAGING |	\
-				 __IOMMU_DOMAIN_DMA_API)
+				 __IOMMU_DOMAIN_DMA_API |       \
+				 __IOMMU_DOMAIN_LP)
 #define IOMMU_DOMAIN_DMA_FQ	(__IOMMU_DOMAIN_PAGING |	\
 				 __IOMMU_DOMAIN_DMA_API |	\
-				 __IOMMU_DOMAIN_DMA_FQ)
+				 __IOMMU_DOMAIN_DMA_FQ |        \
+				 __IOMMU_DOMAIN_LP)
 
 struct iommu_domain {
 	unsigned type;
-- 
2.25.1

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  parent reply	other threads:[~2021-08-28 15:38 UTC|newest]

Thread overview: 27+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-08-28 15:36 [PATCH v2 0/8] Support IOMMU page sizes larger than the CPU page size Sven Peter via iommu
2021-08-28 15:36 ` [PATCH v2 1/8] iommu/dma: Align size for untrusted devs to IOVA granule Sven Peter via iommu
2021-08-28 15:36 ` [PATCH v2 2/8] iommu/dma: Fail unaligned map requests for untrusted devs Sven Peter via iommu
2021-08-28 19:00   ` Sven Peter via iommu
2021-08-28 15:36 ` [PATCH v2 3/8] iommu/dma: Disable get_sgtable for granule > PAGE_SIZE Sven Peter via iommu
2021-08-31 21:30   ` Alyssa Rosenzweig
2021-09-01 17:06     ` Sven Peter via iommu
2021-09-01 21:10       ` Alyssa Rosenzweig
2021-09-02 18:19         ` Sven Peter via iommu
2021-09-02 19:42           ` Robin Murphy
2021-09-03 13:11             ` Alyssa Rosenzweig
2021-09-03 15:16             ` Sven Peter via iommu
2021-09-03 15:45               ` Robin Murphy
2021-09-03 16:51                 ` Sven Peter via iommu
2021-08-28 15:36 ` [PATCH v2 4/8] iommu/dma: Support granule > PAGE_SIZE in dma_map_sg Sven Peter via iommu
2021-08-28 21:10   ` kernel test robot
2021-08-28 22:31   ` kernel test robot
2021-08-28 22:33   ` kernel test robot
2021-08-28 15:36 ` [PATCH v2 5/8] iommu/dma: Support PAGE_SIZE < iovad->granule allocations Sven Peter via iommu
2021-08-28 15:36 ` [PATCH v2 6/8] iommu: Move IOMMU pagesize check to attach_device Sven Peter via iommu
2021-08-31 21:39   ` Alyssa Rosenzweig
2021-09-01 17:14     ` Sven Peter via iommu
2021-09-01 18:53       ` Robin Murphy
2021-08-28 15:36 ` Sven Peter via iommu [this message]
2021-08-28 15:36 ` [PATCH v2 8/8] iommu/dart: Remove force_bypass logic Sven Peter via iommu
2021-08-31 21:40   ` Alyssa Rosenzweig
2021-08-31 21:32 ` [PATCH v2 0/8] Support IOMMU page sizes larger than the CPU page size Alyssa Rosenzweig

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