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

[Vince Hsu]

On 04/17/2015 02:25 PM, Alexandre Courbot wrote:
> On Thu, Apr 16, 2015 at 8:06 PM, Vince Hsu <vinceh at 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
>>


-----------------------------------------------------------------------------------
This email message is for the sole use of the intended recipient(s) and may contain
confidential information.  Any unauthorized review, use, disclosure or distribution
is prohibited.  If you are not the intended recipient, please contact the sender by
reply email and destroy all copies of the original message.
-----------------------------------------------------------------------------------