[PATCH v8 0/4] gpu: nova-core: retain the GSP-RM log buffers

[Vladislav Zaharov <vladazaharova2018@gmail.com>]

The GSP-RM log buffers are exposed through debugfs, but they go away
when the GPU is unbound, including when probe() fails, which is when
they are most useful.

Patch 1 moves the debugfs root into the module data, which also fixes
the root being leaked when the driver registration fails. Patch 2 moves
the log buffer code into its own file. Patch 3 adds a gsp_keep_logs
module parameter that keeps a copy of the buffers after unbind. Patch 4
drops the completed item from todo.rst.

Changes since v7:
 - patch 3: check only gsp_keep_logs, not CONFIG_DEBUG_FS, drop the
   reserve() before replacing the copies, add RetainedLogs::push() and
   mark retained_logs() #[inline] (Danilo)
 - collect Alexandre's Reviewed-by for patches 1 and 2

The code and the commit messages were drafted with an LLM coding
assistant and reviewed by me. Each patch builds on its own, and the
series was tested again on a GB203: the copies are kept after unbind
and after a failed probe, replaced by the live buffers on the next
bind, and nothing is kept without gsp_keep_logs.

v7: https://lore.kernel.org/nova-gpu/20261113075317.934264-1-vladazaharova2018@gmail.com/

Vladislav Zaharov (4):
  gpu: nova-core: move the debugfs root into the module data
  gpu: nova-core: gsp: move the log buffers into their own file
  gpu: nova-core: gsp: retain the GSP-RM log buffers after unbind
  Documentation: nova: remove completed GSP log buffer task

 Documentation/gpu/nova/core/todo.rst   |  12 --
 drivers/gpu/nova-core/debugfs.rs       |  45 ++++++
 drivers/gpu/nova-core/gsp.rs           | 100 +++---------
 drivers/gpu/nova-core/gsp/logbuffer.rs | 205 +++++++++++++++++++++++++
 drivers/gpu/nova-core/nova_core.rs     |  68 +++++---
 5 files changed, 313 insertions(+), 117 deletions(-)
 create mode 100644 drivers/gpu/nova-core/debugfs.rs
 create mode 100644 drivers/gpu/nova-core/gsp/logbuffer.rs


base-commit: 0ff9e5b9ff6736c37593cd7db89f4593ec4f8e86
-- 
2.56.0