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iommu/mediatek: select IOMMU_IOVA

Message ID 1456737124-309812-1-git-send-email-arnd@arndb.de (mailing list archive)
State New, archived
Headers show

Commit Message

Arnd Bergmann Feb. 29, 2016, 9:11 a.m. UTC
The newly added Mediatek IOMMU driver uses the IOMMU_DMA infrastructure,
but unlike other such drivers, it does not select 'ARM_DMA_USE_IOMMU',
which is a prerequisite, leading to a link error:

warning: (MTK_IOMMU) selects IOMMU_DMA which has unmet direct dependencies (IOMMU_SUPPORT && NEED_SG_DMA_LENGTH)
drivers/iommu/built-in.o: In function `iommu_put_dma_cookie':
mtk_iommu.c:(.text+0x11fe): undefined reference to `put_iova_domain'
drivers/iommu/built-in.o: In function `iommu_dma_init_domain':
mtk_iommu.c:(.text+0x1316): undefined reference to `init_iova_domain'
drivers/iommu/built-in.o: In function `__iommu_dma_unmap':
mtk_iommu.c:(.text+0x1380): undefined reference to `find_iova'

This adds the same select that the other drivers have. On a related
note, I wonder if we should just always select ARM_DMA_USE_IOMMU
whenever any IOMMU driver is enabled. Are there any cases where
we would enable an IOMMU but not use it?

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Fixes: 0df4fabe208d ("iommu/mediatek: Add mt8173 IOMMU driver")
---
 drivers/iommu/Kconfig | 1 +
 1 file changed, 1 insertion(+)

Comments

Arnd Bergmann Feb. 29, 2016, 9:17 a.m. UTC | #1
On Monday 29 February 2016 10:11:58 Arnd Bergmann wrote:
> This adds the same select that the other drivers have. On a related
> note, I wonder if we should just always select ARM_DMA_USE_IOMMU
> whenever any IOMMU driver is enabled. Are there any cases where
> we would enable an IOMMU but not use it?

Subject line was wrong, I'll resend this with a second fix on top.

	Arnd
diff mbox

Patch

diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig
index b325954cf8f8..ea0998921702 100644
--- a/drivers/iommu/Kconfig
+++ b/drivers/iommu/Kconfig
@@ -341,6 +341,7 @@  config MTK_IOMMU
 	bool "MTK IOMMU Support"
 	depends on ARM || ARM64
 	depends on ARCH_MEDIATEK || COMPILE_TEST
+	select ARM_DMA_USE_IOMMU
 	select IOMMU_API
 	select IOMMU_DMA
 	select IOMMU_IO_PGTABLE_ARMV7S