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Mon, 2 Mar 2026 11:42:42 +0000 Received: from BL0PR12MB2353.namprd12.prod.outlook.com ([fe80::99b:dcff:8d6d:78e0]) by BL0PR12MB2353.namprd12.prod.outlook.com ([fe80::99b:dcff:8d6d:78e0%4]) with mapi id 15.20.9654.015; Mon, 2 Mar 2026 11:42:41 +0000 From: Eliot Courtney Subject: [PATCH v4 0/9] gpu: nova-core: gsp: add continuation record support Date: Mon, 02 Mar 2026 20:42:24 +0900 Message-Id: <20260302-cmdq-continuation-v4-0-c011f15aad58@nvidia.com> Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-B4-Tracking: v=1; b=H4sIAAAAAAAC/23QTW7DIBAF4KtErEsFw39XvUeVBYZxw8J2gx2UK vLdO7U3qerlQ8M3T/NgM9aCM3s7PVjFVuYyjRT0y4mlSxw/kZdMmYEAK0AonoZ85WkalzLe4kL TvAuhV9kEa5Ni9O+rYl/um/lx3nPF643oZX9kXZyRjGEoC62KOvQICpVxnfZeG1Syx5DARy8gC aONl8GzX+tS5mWq31vdJjdsbybhoFmTXHCnhAsZszFo38dWcomvtHvjGjwT4YgAIgB956w0Rtn +H6GeCLBHhCLCOIh0KGmd/dtiXdcfPQnPpoUBAAA= X-Change-ID: 20260203-cmdq-continuation-b99f3d5966c3 To: Danilo Krummrich , Alice Ryhl , Alexandre Courbot , David Airlie , Simona Vetter , Miguel Ojeda , Boqun Feng , Gary Guo , =?utf-8?q?Bj=C3=B6rn_Roy_Baron?= , Benno Lossin , Andreas Hindborg , Trevor Gross Cc: Zhi Wang , John Hubbard , Alistair Popple , Joel Fernandes , Timur Tabi , nouveau@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, rust-for-linux@vger.kernel.org, Eliot Courtney X-Mailer: b4 0.14.3 X-ClientProxiedBy: TYCP286CA0353.JPNP286.PROD.OUTLOOK.COM (2603:1096:405:7c::10) To BL0PR12MB2353.namprd12.prod.outlook.com (2603:10b6:207:4c::31) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: BL0PR12MB2353:EE_|IA1PR12MB6259:EE_ X-MS-Office365-Filtering-Correlation-Id: 30a4f2a4-15eb-48e0-c2e0-08de7850d01c X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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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 v4: - Removed Tested-by Zhi on the ContinuationRecord patch, since it changed substantively. - Incorporated Alex's design for SplitState - Moved the continuation record types into their own module. - Tightened visibility on continuation record types. - Used non-zero sized command in tests. - Link to v3: https://lore.kernel.org/r/20260226-cmdq-continuation-v3-0-572ab9916766@nvidia.com Changes in v3: - Rebased onto drm-rust-next - Added some doc comments - Reworded command_size doc comment - Link to v2: https://lore.kernel.org/r/20260219-cmdq-continuation-v2-0-2e8b7615536f@nvidia.com 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 continuation records drivers/gpu/nova-core/gsp.rs | 1 + drivers/gpu/nova-core/gsp/cmdq.rs | 114 ++++++-- drivers/gpu/nova-core/gsp/continuation.rs | 305 ++++++++++++++++++++++ drivers/gpu/nova-core/gsp/fw.rs | 75 +++--- drivers/gpu/nova-core/gsp/fw/r570_144/bindings.rs | 1 + rust/kernel/error.rs | 1 + 6 files changed, 440 insertions(+), 57 deletions(-) --- base-commit: 4a49fe23e357b48845e31fe9c28a802c05458198 change-id: 20260203-cmdq-continuation-b99f3d5966c3 Best regards, -- Eliot Courtney