Re: [PATCH 0/6] map big page by platform IOMMU

[Vince Hsu <vinceh-DDmLM1+adcrQT0dZR+AlfA@public.gmane.org>]

On 04/17/2015 02:25 PM, Alexandre Courbot wrote:
> On Thu, Apr 16, 2015 at 8:06 PM, Vince Hsu <vinceh@nvidia.com> wrote:
>> Hi,
>>
>> Generally the the imported buffers which has memory type TTM_PL_TT are
>> mapped as small pages probably due to lack of big page allocation. But the
>> platform device which also use memory type TTM_PL_TT, like GK20A, can
> Nit: GK20A can *only* allocate GPU memory from TTM_PL_TT. Trying to
> allocate from VRAM will result in an error.
Yep.

>
>> *allocate* big page though the IOMMU hardware inside the SoC. This is a try
>> to map the imported buffers as big pages in GMMU by the platform IOMMU. With
>> some preparation work to map decreate small pages into big page(s) by IOMMU
> decreate?
It should be discrete. Sorry for the typo.


>
>> the GMMU eventually sees the imported buffer as chunks of big pages and does
>> the mapping. And then we can probably do the compression on teh imported
>> buffer which is composed of non-contiguous small pages. The compbits related
>> patches shall come later.
>>
>> I guess most of you won't like the change for the MMU code in this series.
>> So please comment and guide me how to do this better. :)
>>
>> Thanks,
>> Vince
>>
>> Vince Hsu (6):
>>    platform: specify the IOMMU physical translation bit
>>    instmem/gk20a: refer to IOMMU physical translation bit
>>    mmu: map small pages into big pages(s) by IOMMU if possible
>>    drm: enable big page mapping for small pages when IOMMU is available
>>    mmu: gf100: share most of functions with GK20A
>>    mmu: gk20a: implement IOMMU mapping for big pages
>>
>>   drm/nouveau/include/nvkm/subdev/mmu.h   |  16 ++
>>   drm/nouveau/nouveau_bo.c                |   9 ++
>>   drm/nouveau/nouveau_platform.c          |  19 +++
>>   drm/nouveau/nouveau_platform.h          |   1 +
>>   drm/nouveau/nvkm/engine/device/gk104.c  |   2 +-
>>   drm/nouveau/nvkm/subdev/instmem/gk20a.c |  13 +-
>>   drm/nouveau/nvkm/subdev/mmu/Kbuild      |   1 +
>>   drm/nouveau/nvkm/subdev/mmu/base.c      | 158 +++++++++++++++++++-
>>   drm/nouveau/nvkm/subdev/mmu/gf100.c     |  28 +---
>>   drm/nouveau/nvkm/subdev/mmu/gf100.h     |  46 ++++++
>>   drm/nouveau/nvkm/subdev/mmu/gk20a.c     | 253 ++++++++++++++++++++++++++++++++
>>   lib/include/nvif/os.h                   |  12 ++
>>   12 files changed, 526 insertions(+), 32 deletions(-)
>>   create mode 100644 drm/nouveau/nvkm/subdev/mmu/gf100.h
>>   create mode 100644 drm/nouveau/nvkm/subdev/mmu/gk20a.c
>>
>> --
>> 2.1.4
>>


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