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Groups > linux.kernel > #1335312
| From | "Niklas Söderlund" <niklas.soderlund@ragnatech.se> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v3 1/8] iommu: Add MMIO mapping type |
| Date | 2016-02-16 13:10 +0100 |
| Message-ID | <r2MC6-7Er-23@gated-at.bofh.it> (permalink) |
| References | <r0rs6-3Ax-3@gated-at.bofh.it> <r0rs6-3Ax-15@gated-at.bofh.it> <r0MZz-10t-11@gated-at.bofh.it> <r11OV-2po-7@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
Hi Robin,
Thanks for your update patch I will include it in my next version. But
I'm sorry I do not understand, is your modification an addition or a
substitution to your original patch?
* Robin Murphy <robin.murphy@arm.com> [2016-02-11 15:57:26 +0000]:
> On 11/02/16 00:02, Laurent Pinchart wrote:
> >Hi Niklas,
> >
> >Thank you for the patch.
> >
> >On Wednesday 10 February 2016 01:57:51 Niklas Söderlund wrote:
> >>From: Robin Murphy <robin.murphy@arm.com>
> >>
> >>On some platforms, MMIO regions might need slightly different treatment
> >>compared to mapping regular memory; add the notion of MMIO mappings to
> >>the IOMMU API's memory type flags, so that callers can let the IOMMU
> >>drivers know to do the right thing.
> >>
> >>Signed-off-by: Robin Murphy <robin.murphy@arm.com>
> >>Acked-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> >
> >Answering the question from the cover letter, yes, it's totally fine to pick
> >the ack, that's actually expected.
> >
> >>---
> >> drivers/iommu/io-pgtable-arm.c | 4 +++-
> >> include/linux/iommu.h | 1 +
> >
> >You might be asked to split this patch in two.
>
> Worse than that, you might also be asked to fix it up when the silly author
> remembers that he did this on a stage-2-only ARM SMMU, and the attributes
> for the stage 1 tables that the IPMMU uses are in a different code path:
>
> --->8---
> diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
> index 5b5c299..7622c6e 100644
> --- a/drivers/iommu/io-pgtable-arm.c
> +++ b/drivers/iommu/io-pgtable-arm.c
> @@ -354,7 +354,10 @@ static arm_lpae_iopte arm_lpae_prot_to_pte(struct
> arm_lpae_io_pgtable *data,
> if (!(prot & IOMMU_WRITE) && (prot & IOMMU_READ))
> pte |= ARM_LPAE_PTE_AP_RDONLY;
>
> - if (prot & IOMMU_CACHE)
> + if (prot & IOMMU_MMIO)
> + pte |= (ARM_LPAE_MAIR_ATTR_IDX_DEV
> + << ARM_LPAE_PTE_ATTRINDX_SHIFT);
> + else if (prot & IOMMU_CACHE)
> pte |= (ARM_LPAE_MAIR_ATTR_IDX_CACHE
> << ARM_LPAE_PTE_ATTRINDX_SHIFT);
> } else {
> --->8---
>
> Sorry for the bother,
> Robin.
>
> >> 2 files changed, 4 insertions(+), 1 deletion(-)
> >>
> >>diff --git a/drivers/iommu/io-pgtable-arm.c b/drivers/iommu/io-pgtable-arm.c
> >>index 381ca5a..3ff4f87 100644
> >>--- a/drivers/iommu/io-pgtable-arm.c
> >>+++ b/drivers/iommu/io-pgtable-arm.c
> >>@@ -364,7 +364,9 @@ static arm_lpae_iopte arm_lpae_prot_to_pte(struct
> >>arm_lpae_io_pgtable *data, pte |= ARM_LPAE_PTE_HAP_READ;
> >> if (prot & IOMMU_WRITE)
> >> pte |= ARM_LPAE_PTE_HAP_WRITE;
> >>- if (prot & IOMMU_CACHE)
> >>+ if (prot & IOMMU_MMIO)
> >>+ pte |= ARM_LPAE_PTE_MEMATTR_DEV;
> >>+ else if (prot & IOMMU_CACHE)
> >> pte |= ARM_LPAE_PTE_MEMATTR_OIWB;
> >> else
> >> pte |= ARM_LPAE_PTE_MEMATTR_NC;
> >>diff --git a/include/linux/iommu.h b/include/linux/iommu.h
> >>index a5c539f..34b6432 100644
> >>--- a/include/linux/iommu.h
> >>+++ b/include/linux/iommu.h
> >>@@ -30,6 +30,7 @@
> >> #define IOMMU_WRITE (1 << 1)
> >> #define IOMMU_CACHE (1 << 2) /* DMA cache coherency */
> >> #define IOMMU_NOEXEC (1 << 3)
> >>+#define IOMMU_MMIO (1 << 4) /* e.g. things like MSI doorbells */
> >>
> >> struct iommu_ops;
> >> struct iommu_group;
> >
>
Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
[PATCH v3 0/8] dmaengine: rcar-dmac: add iommu support for slave transfers Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> - 2016-02-10 02:10 +0100
[PATCH v3 1/8] iommu: Add MMIO mapping type Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> - 2016-02-10 02:10 +0100
Re: [PATCH v3 1/8] iommu: Add MMIO mapping type Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2016-02-11 01:10 +0100
Re: [PATCH v3 1/8] iommu: Add MMIO mapping type Robin Murphy <robin.murphy@arm.com> - 2016-02-11 17:00 +0100
Re: [PATCH v3 1/8] iommu: Add MMIO mapping type "Niklas Söderlund" <niklas.soderlund@ragnatech.se> - 2016-02-16 13:10 +0100
Re: [PATCH v3 1/8] iommu: Add MMIO mapping type Robin Murphy <robin.murphy@arm.com> - 2016-02-16 13:50 +0100
Re: [PATCH v3 1/8] iommu: Add MMIO mapping type Niklas Söderlund <niklas.soderlund@ragnatech.se> - 2016-02-16 14:40 +0100
[PATCH v3 5/8] dmaengine: rcar-dmac: group slave configuration Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> - 2016-02-10 02:10 +0100
Re: [PATCH v3 5/8] dmaengine: rcar-dmac: group slave configuration Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2016-02-11 01:20 +0100
[PATCH v3 6/8] dmaengine: rcar-dmac: add iommu support for slave transfers Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> - 2016-02-10 02:10 +0100
Re: [PATCH v3 6/8] dmaengine: rcar-dmac: add iommu support for slave transfers Robin Murphy <robin.murphy@arm.com> - 2016-02-10 11:50 +0100
Re: [PATCH v3 6/8] dmaengine: rcar-dmac: add iommu support for slave transfers Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2016-02-11 01:40 +0100
[PATCH v3 3/8] dma-mapping: add dma_{map,unmap}_resource Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> - 2016-02-10 02:10 +0100
Re: [PATCH v3 3/8] dma-mapping: add dma_{map,unmap}_resource Robin Murphy <robin.murphy@arm.com> - 2016-02-10 11:30 +0100
[PATCH v3 7/8] ARM: dts: r8a7790: add iommus to dmac0 and dmac1 Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> - 2016-02-10 02:10 +0100
Re: [PATCH v3 7/8] ARM: dts: r8a7790: add iommus to dmac0 and dmac1 Simon Horman <horms@verge.net.au> - 2016-02-10 19:00 +0100
Re: [PATCH v3 7/8] ARM: dts: r8a7790: add iommus to dmac0 and dmac1 "Niklas Söderlund" <niklas.soderlund@ragnatech.se> - 2016-02-11 02:00 +0100
Re: [PATCH v3 7/8] ARM: dts: r8a7790: add iommus to dmac0 and dmac1 Laurent Pinchart <laurent.pinchart@ideasonboard.com> - 2016-02-11 01:50 +0100
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