From: "Isaac J. Manjarres" <isaacm@codeaurora.org>
To: iommu@lists.linux-foundation.org, linux-arm-kernel@lists.infradead.org
Cc: "Isaac J. Manjarres" <isaacm@codeaurora.org>,
will@kernel.org, robin.murphy@arm.com, pratikp@codeaurora.org
Subject: [RFC PATCH 2/5] iommu: Add an unmap_pages() op for IOMMU drivers
Date: Tue, 30 Mar 2021 20:00:39 -0700 [thread overview]
Message-ID: <20210331030042.13348-3-isaacm@codeaurora.org> (raw)
In-Reply-To: <20210331030042.13348-1-isaacm@codeaurora.org>
Add a callback for IOMMU drivers to provide a path for the
IOMMU framework to call into an IOMMU driver, which can call
into the io-pgtable code, to unmap a virtually contiguous
range of pages of the same size.
For IOMMU drivers that do not specify an unmap_pages() callback,
the existing logic of unmapping memory one page block at a time
will be used.
Signed-off-by: Isaac J. Manjarres <isaacm@codeaurora.org>
Suggested-by: Will Deacon <will@kernel.org>
---
include/linux/iommu.h | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 5e7fe519430a..9cf81242581a 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -193,6 +193,7 @@ struct iommu_iotlb_gather {
* @detach_dev: detach device from an iommu domain
* @map: map a physically contiguous memory region to an iommu domain
* @unmap: unmap a physically contiguous memory region from an iommu domain
+ * @unmap_pages: unmap a number of pages of the same size from an iommu domain
* @flush_iotlb_all: Synchronously flush all hardware TLBs for this domain
* @iotlb_sync_map: Sync mappings created recently using @map to the hardware
* @iotlb_sync: Flush all queued ranges from the hardware TLBs and empty flush
@@ -245,6 +246,9 @@ struct iommu_ops {
phys_addr_t paddr, size_t size, int prot, gfp_t gfp);
size_t (*unmap)(struct iommu_domain *domain, unsigned long iova,
size_t size, struct iommu_iotlb_gather *iotlb_gather);
+ size_t (*unmap_pages)(struct iommu_domain *domain, unsigned long iova,
+ size_t pgsize, size_t pgcount,
+ struct iommu_iotlb_gather *iotlb_gather);
void (*flush_iotlb_all)(struct iommu_domain *domain);
void (*iotlb_sync_map)(struct iommu_domain *domain, unsigned long iova,
size_t size);
--
The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum,
a Linux Foundation Collaborative Project
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next prev parent reply other threads:[~2021-03-31 3:06 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-31 3:00 [RFC PATCH 0/5] Optimization for unmapping iommu mapped buffers Isaac J. Manjarres
2021-03-31 3:00 ` [RFC PATCH 1/5] iommu/io-pgtable: Introduce unmap_pages() as a page table op Isaac J. Manjarres
2021-03-31 3:00 ` Isaac J. Manjarres [this message]
2021-03-31 4:47 ` [RFC PATCH 2/5] iommu: Add an unmap_pages() op for IOMMU drivers Lu Baolu
2021-03-31 5:36 ` isaacm
2021-03-31 5:39 ` Lu Baolu
2021-04-02 17:25 ` isaacm
2021-04-03 1:35 ` Lu Baolu
2021-03-31 3:00 ` [RFC PATCH 3/5] iommu: Add support for the unmap_pages IOMMU callback Isaac J. Manjarres
2021-04-01 15:34 ` Robin Murphy
2021-04-01 16:37 ` Will Deacon
2021-03-31 3:00 ` [RFC PATCH 4/5] iommu/io-pgtable-arm: Implement arm_lpae_unmap_pages() Isaac J. Manjarres
2021-04-01 17:19 ` Robin Murphy
2021-03-31 3:00 ` [RFC PATCH 5/5] iommu/arm-smmu: Implement the unmap_pages IOMMU driver callback Isaac J. Manjarres
2021-04-01 3:28 ` [RFC PATCH 0/5] Optimization for unmapping iommu mapped buffers chenxiang (M)
2021-04-01 15:33 ` Robin Murphy
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