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no-senders; approved; emergency; loop; banned-address; member-moderation CC: Danilo Krummrich , Alice Ryhl , Alexandre Courbot , Simona Vetter , Miguel Ojeda , Boqun Feng , Gary Guo , =?UTF-8?B?QmrDtnJu?= Roy Baron , Benno Lossin , Andreas Hindborg , Trevor Gross , nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org X-Mailman-Version: 3.3.8 Precedence: list List-Id: Nouveau development list Archived-At: Archived-At: List-Archive: List-Archive: List-Help: List-Owner: List-Post: List-Subscribe: List-Unsubscribe: On Thu, 19 Feb 2026 16:30:49 +0900 Eliot Courtney wrote: Tested-by: Zhi Wang > GSP commands over 16 pages need to be sent using "continuation > records" which essentially means splitting the payload over multiple > commands. > > This series adds a command type `ContinuationRecord` which just writes > its header and whatever payload it is given. It also adds types > `SplitState` and `SplitCommand` which support splitting a large RPC > into smaller ones while transparently letting regular sized RPCs be > sent without extra copies. > > The send pathway uses `SplitState` to send all commands, but if > the command fits into 16 pages, it still writes directly into the > command queue. If it is larger than 16 pages and needs continuation > records, it writes into a staging buffer, so there is one copy. > > Signed-off-by: Eliot Courtney > --- > Changes in v2: > - Added doccoments > - Renamed driver_bytes_available_to_write to driver_write_area_size > - allocate_command_with_timeout merged allocate_command with timeout > parameter > - Replaced hardcoded GSP_PAGE_SIZE * 16 with bindings > - Changed oversized command error from EIO to EMSGSIZE > - Added EMSGSIZE to kernel/error.rs > - Split WrappingCommand functionality into SplitState + SplitCommand > enum > - Made max_size a const (MAX_CMD_SIZE) > - Removed send_continuation_record + added comment for type inference > - send_single_command now consumes the command > - Extracted command_size + used in SplitState > - Link to v1: > https://lore.kernel.org/r/20260212-cmdq-continuation-v1-0-73079ded55e6@nvidia.com > > --- > Eliot Courtney (9): > gpu: nova-core: gsp: sort MsgFunction variants alphabetically > gpu: nova-core: gsp: add mechanism to wait for space on command > queue rust: add EMSGSIZE error code > gpu: nova-core: gsp: add checking oversized commands > gpu: nova-core: gsp: clarify invariant on command queue > gpu: nova-core: gsp: unconditionally call variable payload > handling gpu: nova-core: gsp: add command_size helper > gpu: nova-core: gsp: support large RPCs via continuation record > gpu: nova-core: gsp: add tests for SplitState > > drivers/gpu/nova-core/gsp/cmdq.rs | 118 +++++++--- > drivers/gpu/nova-core/gsp/commands.rs | 256 > +++++++++++++++++++++- drivers/gpu/nova-core/gsp/fw.rs > | 106 +++++---- drivers/gpu/nova-core/gsp/fw/r570_144/bindings.rs > | 1 + rust/kernel/error.rs | 1 + > 5 files changed, 408 insertions(+), 74 deletions(-) > --- > base-commit: 956b9cbd7f156c8672dac94a00de3c6a0939c692 > change-id: 20260203-cmdq-continuation-b99f3d5966c3 > > Best regards,