From: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
To: joro@8bytes.org, axboe@kernel.dk, ulf.hansson@linaro.org,
wsa+renesas@sang-engineering.com
Cc: hch@lst.de, iommu@lists.linux-foundation.org,
linux-block@vger.kernel.org, linux-mmc@vger.kernel.org,
linux-renesas-soc@vger.kernel.org,
Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Subject: [RFC PATCH v6 1/5] iommu: add an exported function to get minimum page size for a domain
Date: Thu, 13 Jun 2019 19:20:11 +0900 [thread overview]
Message-ID: <1560421215-10750-2-git-send-email-yoshihiro.shimoda.uh@renesas.com> (raw)
In-Reply-To: <1560421215-10750-1-git-send-email-yoshihiro.shimoda.uh@renesas.com>
This patch adds an exported function to get minimum page size for
a domain. This patch also modifies similar codes on the iommu.c.
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
---
drivers/iommu/iommu.c | 18 +++++++++++++++---
include/linux/iommu.h | 1 +
2 files changed, 16 insertions(+), 3 deletions(-)
diff --git a/drivers/iommu/iommu.c b/drivers/iommu/iommu.c
index 2a90638..7ed16af 100644
--- a/drivers/iommu/iommu.c
+++ b/drivers/iommu/iommu.c
@@ -280,6 +280,18 @@ iommu_insert_device_resv_regions(struct list_head *dev_resv_regions,
return ret;
}
+/**
+ * iommu_get_minimum_page_size - get minimum page size for a domain
+ * @domain: the domain
+ *
+ * Allow iommu driver to get a minimum page size for a domain.
+ */
+unsigned long iommu_get_minimum_page_size(struct iommu_domain *domain)
+{
+ return 1UL << __ffs(domain->pgsize_bitmap);
+}
+EXPORT_SYMBOL_GPL(iommu_get_minimum_page_size);
+
int iommu_get_group_resv_regions(struct iommu_group *group,
struct list_head *head)
{
@@ -558,7 +570,7 @@ static int iommu_group_create_direct_mappings(struct iommu_group *group,
BUG_ON(!domain->pgsize_bitmap);
- pg_size = 1UL << __ffs(domain->pgsize_bitmap);
+ pg_size = iommu_get_minimum_page_size(domain);
INIT_LIST_HEAD(&mappings);
iommu_get_resv_regions(dev, &mappings);
@@ -1595,7 +1607,7 @@ int iommu_map(struct iommu_domain *domain, unsigned long iova,
return -EINVAL;
/* find out the minimum page size supported */
- min_pagesz = 1 << __ffs(domain->pgsize_bitmap);
+ min_pagesz = iommu_get_minimum_page_size(domain);
/*
* both the virtual address and the physical one, as well as
@@ -1655,7 +1667,7 @@ static size_t __iommu_unmap(struct iommu_domain *domain,
return 0;
/* find out the minimum page size supported */
- min_pagesz = 1 << __ffs(domain->pgsize_bitmap);
+ min_pagesz = iommu_get_minimum_page_size(domain);
/*
* The virtual address, as well as the size of the mapping, must be
diff --git a/include/linux/iommu.h b/include/linux/iommu.h
index 91af22a..7e53b43 100644
--- a/include/linux/iommu.h
+++ b/include/linux/iommu.h
@@ -366,6 +366,7 @@ extern int iommu_request_dma_domain_for_dev(struct device *dev);
extern struct iommu_resv_region *
iommu_alloc_resv_region(phys_addr_t start, size_t length, int prot,
enum iommu_resv_type type);
+extern unsigned long iommu_get_minimum_page_size(struct iommu_domain *domain);
extern int iommu_get_group_resv_regions(struct iommu_group *group,
struct list_head *head);
--
2.7.4
next prev parent reply other threads:[~2019-06-13 15:36 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-13 10:20 [RFC PATCH v6 0/5] treewide: improve R-Car SDHI performance Yoshihiro Shimoda
2019-06-13 10:20 ` Yoshihiro Shimoda [this message]
2019-06-13 19:37 ` [RFC PATCH v6 1/5] iommu: add an exported function to get minimum page size for a domain Wolfram Sang
2019-06-14 7:16 ` Christoph Hellwig
2019-06-17 5:08 ` Yoshihiro Shimoda
2019-06-14 9:41 ` Robin Murphy
2019-06-17 5:23 ` Yoshihiro Shimoda
2019-06-13 10:20 ` [RFC PATCH v6 2/5] block: sort headers on blk-setting.c Yoshihiro Shimoda
2019-06-13 19:40 ` Wolfram Sang
2019-06-13 10:20 ` [RFC PATCH v6 3/5] block: add a helper function to merge the segments by an IOMMU Yoshihiro Shimoda
2019-06-14 7:22 ` Christoph Hellwig
2019-06-14 9:54 ` Robin Murphy
2019-06-17 6:29 ` Yoshihiro Shimoda
2019-06-13 10:20 ` [RFC PATCH v6 4/5] mmc: tmio: Use dma_max_mapping_size() instead of a workaround Yoshihiro Shimoda
2019-06-13 19:45 ` Wolfram Sang
2019-06-17 4:25 ` Yoshihiro Shimoda
2019-06-13 20:35 ` Geert Uytterhoeven
2019-06-14 7:18 ` Christoph Hellwig
2019-06-14 7:27 ` Geert Uytterhoeven
2019-06-17 4:54 ` Yoshihiro Shimoda
2019-06-17 6:23 ` Geert Uytterhoeven
2019-06-17 6:54 ` Yoshihiro Shimoda
2019-06-13 10:20 ` [RFC PATCH v6 5/5] mmc: queue: Use bigger segments if IOMMU can merge the segments Yoshihiro Shimoda
2019-06-13 19:58 ` Wolfram Sang
2019-06-17 6:38 ` Yoshihiro Shimoda
2019-06-14 7:24 ` Christoph Hellwig
2019-06-14 10:42 ` Wolfram Sang
2019-06-17 6:46 ` Yoshihiro Shimoda
2019-06-17 6:53 ` Christoph Hellwig
2019-06-17 7:02 ` Yoshihiro Shimoda
2019-06-13 19:36 ` [RFC PATCH v6 0/5] treewide: improve R-Car SDHI performance Wolfram Sang
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