[PATCH v2 0/6] Improve GK20A support, introduce GM20B, firmware paths

[Alexandre Courbot]

Second version of this patchset. Not many changes since first version - I hope
this means the changes are not too controversial.

Changes since v1:
- Removed lookup for previous FW files in "nouveau/"
- Went back to using request_firmware() since we only try to load one file

Original cover letter follows:

GM20B is the GPU of the upcoming Tegra X1 SoC. This series adds initial support
for it, based on a rework of the already-supported GK20A. It also introduces
support for NVIDIA-provided firmware files, which is why I have added a few
NVIDIA people who are relevant to this discussion.

The first patch adds support for loading the FECS and GPCCS firmwares from
firmware files officially released by NVIDIA. As you know such firmwares will
soon become a necessity for newer GPUs because some falcons will require signed
firmware to operate. In addition there is no reverse-engineered version of the
GK20A firmwares yet, so since an external file is needed anyway, it may as well
be provided officially. NVIDIA plans to release firmwares as one file per binary
to keep things simple. The layout will be nvidia/<gpu>/<firmware>.bin, so for
GK20A FECS/GPCCS we have:

nvidia/gk20a/fecs_inst.bin (aka fuc409c)
nvidia/gk20a/fecs_data.bin (aka fuc409d)
nvidia/gk20a/gpccs_inst.bin (aka fuc41ac)
nvidia/gk20a/gpccs_data.bin (aka fuc41ad)

All firmware files listed in this patchset are clean for release, and I am just
waiting for a community ack of the layout to send a patch to linux-firmware.

The second patch reworks existing GK20A support to make it closer to what our
nvgpu driver does. Support so far was heavily based on GK104, which somehow made
me feel uneasy - and quite scared after I looked more closely at what nvgpu
does. In particular the GK104 MMIO bundles differed significantly from what
nvgpu does. This change aligns things and (probably less significant, but still
safer) reorders the initialization sequence to match the one of nvgpu.

You will note that the MMIO bundles now come as firmware files of their own. I
am not sure the community will be pleased with an increase of firmware files,
however the rationale for this is as follows:
- These initialization sequences are related to the firmwares, so it makes sense
  to distribute them under the same medium
- If NVIDIA needs to update the firmwares for some reason, it can atomically
  update the MMIO bundles and provide a coherent set, instead of having to
  introduce versioning into the firmware and driver
- For IP reasons, I as an NVIDIA employee cannot extract these register
  sequences and link them into Nouveau
- These are just a bunch of register address/value pairs anyway

The new firmware files introduced are:

nvidia/gk20a/sw_nonctx.bin (gr_pack_mmio)
nvidia/gk20a/sw_ctx.bin (grctx_pack_hub, grctx_pack_gpc, grctx_pack_zcull,
                         grctx_pack_tpc, grctx_pack_ppc)
nvidia/gk20a/sw_bundle_init.bin (grctx_pack_icmd)
nvidia/gk20a/sw_method_init.bin (grctx_pack_mthd)

Third patch is trivial and adds the GM20B FIFO device.

Fourth patch adds GM20B GR based on the reworked GK20A support. GM20B will rely
on the same firmware files as GK20A (also clean for release). Note that this is
not full support yet for released devices, which will require secure boot. This
will be my focus once this patchset is merged (Deepak got a working version,
but there is still a lot of work to do on it before it is upstreamable).

The last two patches recognize GM20B at the device and platform level. Nothing
really exciting.

I hope the addition of firmware files will not become too controversial. If it
does, I have good arguments to support it. ;) Besides the GK20A rework that
probably few people care about, the point is the addition of a basic layout for
the firmwares that NVIDIA will officially release to finally support secure
boot, and I would like to make sure we get this right.

Alexandre Courbot (6):
  gr: use NVIDIA-provided external firmwares
  gr/gk20a: use same initialization sequence as nvgpu
  fifo: add GM20B fifo
  gr: add GM20B support
  device: recognize GM20B
  platform: recognize GM20B

 drm/nouveau/include/nvkm/engine/fifo.h |   1 +
 drm/nouveau/include/nvkm/engine/gr.h   |   1 +
 drm/nouveau/nouveau_platform.c         |   1 +
 drm/nouveau/nvkm/engine/device/gm100.c |  20 ++
 drm/nouveau/nvkm/engine/fifo/Kbuild    |   1 +
 drm/nouveau/nvkm/engine/fifo/gk104.h   |   4 +
 drm/nouveau/nvkm/engine/fifo/gm204.c   |   2 +-
 drm/nouveau/nvkm/engine/fifo/gm20b.c   |  34 ++++
 drm/nouveau/nvkm/engine/gr/Kbuild      |   2 +
 drm/nouveau/nvkm/engine/gr/ctxgf100.h  |   7 +
 drm/nouveau/nvkm/engine/gr/ctxgk20a.c  |  65 +++++--
 drm/nouveau/nvkm/engine/gr/ctxgm107.c  |   2 +-
 drm/nouveau/nvkm/engine/gr/ctxgm204.c  |   4 +-
 drm/nouveau/nvkm/engine/gr/ctxgm20b.c  | 110 +++++++++++
 drm/nouveau/nvkm/engine/gr/gf100.c     |  35 ++--
 drm/nouveau/nvkm/engine/gr/gf100.h     |  18 ++
 drm/nouveau/nvkm/engine/gr/gk20a.c     | 336 +++++++++++++++++++++++++++++++--
 drm/nouveau/nvkm/engine/gr/gk20a.h     |  35 ++++
 drm/nouveau/nvkm/engine/gr/gm20b.c     |  84 +++++++++
 19 files changed, 716 insertions(+), 46 deletions(-)
 create mode 100644 drm/nouveau/nvkm/engine/fifo/gm20b.c
 create mode 100644 drm/nouveau/nvkm/engine/gr/ctxgm20b.c
 create mode 100644 drm/nouveau/nvkm/engine/gr/gk20a.h
 create mode 100644 drm/nouveau/nvkm/engine/gr/gm20b.c

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2.4.4