From: will.deacon@arm.com (Will Deacon)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH 3/9] ARM: dma-mapping: Always pass proper prot flags to iommu_map()
Date: Fri, 27 Sep 2013 09:35:24 +0100 [thread overview]
Message-ID: <20130927083523.GA8319@mudshark.cambridge.arm.com> (raw)
In-Reply-To: <1380234982-1677-4-git-send-email-andreas.herrmann@calxeda.com>
On Thu, Sep 26, 2013 at 11:36:15PM +0100, Andreas Herrmann wrote:
> ... otherwise it is impossible for the low level iommu driver to
> figure out which pte flags should be used.
>
> In __map_sg_chunk we can derive the flags from dma_data_direction.
>
> In __iommu_create_mapping we should treat the memory like
> DMA_BIDIRECTIONAL and pass both IOMMU_READ and IOMMU_WRITE to
> iommu_map.
> __iommu_create_mapping is used during dma_alloc_coherent (via
> arm_iommu_alloc_attrs). AFAIK dma_alloc_coherent is responsible for
> allocation _and_ mapping. I think this implies that access to the
> mapped pages should be allowed.
>
> Cc: Marek Szyprowski <m.szyprowski@samsung.com>
> Signed-off-by: Andreas Herrmann <andreas.herrmann@calxeda.com>
Acked-by: Will Deacon <will.deacon@arm.com>
This one should go via the dma-mapping tree.
Will
next prev parent reply other threads:[~2013-09-27 8:35 UTC|newest]
Thread overview: 43+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-09-26 22:36 [PATCH 0/9] arm-smmu: Misc changes/Calxeda ECX-2000 support Andreas Herrmann
2013-09-26 22:36 ` [PATCH 1/9] iommu/arm-smmu: Switch to arch_initcall for driver registration Andreas Herrmann
2013-09-27 8:58 ` Will Deacon
2013-09-27 9:24 ` Andreas Herrmann
2013-09-27 10:02 ` [PATCH] iommu/arm-smmu: Switch to subsys_initcall " Andreas Herrmann
2013-09-26 22:36 ` [PATCH 2/9] iommu/arm-smmu: Calculate SMMU_CB_BASE from smmu register values Andreas Herrmann
2013-09-27 9:51 ` Will Deacon
2013-09-27 10:23 ` Andreas Herrmann
2013-09-27 10:51 ` Will Deacon
2013-09-27 11:05 ` Andreas Herrmann
2013-09-27 11:08 ` Will Deacon
2013-09-27 14:33 ` [PATCH] iommu/arm-smmu: Refine check for proper size of mapped region Andreas Herrmann
2013-09-26 22:36 ` [PATCH 3/9] ARM: dma-mapping: Always pass proper prot flags to iommu_map() Andreas Herrmann
2013-09-27 8:35 ` Will Deacon [this message]
2013-09-30 13:40 ` Marek Szyprowski
2013-09-26 22:36 ` [PATCH 4/9] iommu/arm-smmu: Check for num_context_irqs > 0 to avoid divide by zero exception Andreas Herrmann
2013-09-27 8:41 ` Will Deacon
2013-09-27 9:03 ` Andreas Herrmann
2013-09-27 10:23 ` Will Deacon
2013-09-27 10:39 ` Andreas Herrmann
2013-09-27 10:48 ` Will Deacon
2013-09-27 11:07 ` Andreas Herrmann
2013-09-27 14:30 ` [PATCH] " Andreas Herrmann
2013-09-26 22:36 ` [PATCH 5/9] iommu/arm-smmu: Clear global and context bank fault status registers Andreas Herrmann
2013-09-27 8:52 ` Will Deacon
2013-09-30 13:54 ` Andreas Herrmann
2013-09-30 13:56 ` [PATCH] " Andreas Herrmann
2013-09-30 16:06 ` Will Deacon
2013-09-30 17:17 ` Andreas Herrmann
2013-09-30 18:30 ` Will Deacon
2013-09-30 21:06 ` Andreas Herrmann
2013-09-26 22:36 ` [PATCH 6/9] iommu/arm-smmu: Support buggy implemenations where all config accesses are secure Andreas Herrmann
2013-09-27 13:05 ` Will Deacon
2013-09-27 13:48 ` Andreas Herrmann
2013-09-26 22:36 ` [PATCH 7/9] iommu/arm-smmu: Add function that conditionally isolates all masters of all SMMUs Andreas Herrmann
2013-09-27 13:00 ` Will Deacon
2013-10-07 15:42 ` Andreas Herrmann
2013-10-08 10:43 ` Will Deacon
2013-09-26 22:36 ` [PATCH 8/9] iommu/arm-smmu: Introduce a default fault handler Andreas Herrmann
2013-09-27 10:09 ` Will Deacon
2013-09-27 10:45 ` Andreas Herrmann
2013-09-27 21:22 ` [PATCH] iommu/arm-smmu: Print context fault information Andreas Herrmann
2013-09-26 22:36 ` [PATCH 9/9] ARM: dts: Add nodes for SMMUs on Calxeda ECX-2000 Andreas Herrmann
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