linux-kernel - [PATCH v7 04/15] iommu: Add a map

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Message-ID: <1623850736-389584-5-git-send-email-quic_c_gdjako@quicinc.com>
Date:   Wed, 16 Jun 2021 06:38:45 -0700
From:   Georgi Djakov <quic_c_gdjako@...cinc.com>
To:     <will@...nel.org>, <robin.murphy@....com>
CC:     <joro@...tes.org>, <isaacm@...eaurora.org>,
        <baolu.lu@...ux.intel.com>, <pratikp@...eaurora.org>,
        <iommu@...ts.linux-foundation.org>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>, <djakov@...nel.org>
Subject: [PATCH v7 04/15] iommu: Add a map_pages() op for IOMMU drivers

From: "Isaac J. Manjarres" <isaacm@...eaurora.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 map a physically contiguous
rnage of pages of the same size.

For IOMMU drivers that do not specify a map_pages() callback,
the existing logic of mapping memory one page block at a time
will be used.

Signed-off-by: Isaac J. Manjarres <isaacm@...eaurora.org>
Suggested-by: Will Deacon <will@...nel.org>
Acked-by: Lu Baolu <baolu.lu@...ux.intel.com>
Signed-off-by: Georgi Djakov <quic_c_gdjako@...cinc.com>
---
 include/linux/iommu.h | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 25a844121be5..d7989d4a7404 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -180,6 +180,8 @@ struct iommu_iotlb_gather {
  * @attach_dev: attach device to an iommu domain
  * @detach_dev: detach device from an iommu domain
  * @map: map a physically contiguous memory region to an iommu domain
+ * @map_pages: map a physically contiguous set of pages of the same size 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
@@ -230,6 +232,9 @@ struct iommu_ops {
 	void (*detach_dev)(struct iommu_domain *domain, struct device *dev);
 	int (*map)(struct iommu_domain *domain, unsigned long iova,
 		   phys_addr_t paddr, size_t size, int prot, gfp_t gfp);
+	int (*map_pages)(struct iommu_domain *domain, unsigned long iova,
+			 phys_addr_t paddr, size_t pgsize, size_t pgcount,
+			 int prot, gfp_t gfp, size_t *mapped);
 	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,