From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id A3EFAC54FB3 for ; Sun, 1 Jun 2025 23:25:02 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 25BDA10E19D; Sun, 1 Jun 2025 23:25:02 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=kernel.org header.i=@kernel.org header.b="URc9jV5p"; dkim-atps=neutral Received: from dfw.source.kernel.org (dfw.source.kernel.org [139.178.84.217]) by gabe.freedesktop.org (Postfix) with ESMTPS id 87F7010E1E1; Sun, 1 Jun 2025 23:25:00 +0000 (UTC) Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 23C625C51A3; Sun, 1 Jun 2025 23:22:43 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 86A49C4CEE7; Sun, 1 Jun 2025 23:24:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1748820299; bh=QZFDa7bYCggNE+YvuxSeXpMMdvPHtdpdYuAPi17x5QU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=URc9jV5pqfL2eAT/a5plf0MmpSOzcZX1/tHAo+HheitZuoVMIznInLZSHfsWAhYq8 rAyUbxUrMCrcTfBhTn1jTNB/HcnzmKsQ20RtrvZMHw515FMAfihLtzXMkdlnZIJ7wG GSRhwCzM7jSgjBcBwKTJ/BGhrUbuPbd//DXSBfbG4ukwVeAvhlv1YY3A+2rmpt+ogt 6iXdmKaNrLtdM4f7rJRNuSIwNMCwWvMfZ6szf6dRPkfMraLrlmeJgitGSGQuQIqJOL duiqR1mpBNbhyfsIeuo8ws3UjDCHJ+r7WKYx0YL1lbKIvcCmKdL1SzhO9oOO8/YkIG 1m5B+SJnA3hMA== From: Sasha Levin To: patches@lists.linux.dev, stable@vger.kernel.org Cc: "Jesse.Zhang" , Jesse Zhang , "Shaoyun . liu" , Prike Liang , Alex Deucher , Sasha Levin , christian.koenig@amd.com, airlied@gmail.com, simona@ffwll.ch, sunil.khatri@amd.com, Jack.Xiao@amd.com, srinivasan.shanmugam@amd.com, shaoyun.liu@amd.com, Jiadong.Zhu@amd.com, Hawking.Zhang@amd.com, michael.chen@amd.com, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: [PATCH AUTOSEL 6.15 008/110] drm/amdgpu: Fix API status offset for MES queue reset Date: Sun, 1 Jun 2025 19:22:50 -0400 Message-Id: <20250601232435.3507697-8-sashal@kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250601232435.3507697-1-sashal@kernel.org> References: <20250601232435.3507697-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-stable-base: Linux 6.15 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-BeenThere: amd-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Discussion list for AMD gfx List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: amd-gfx-bounces@lists.freedesktop.org Sender: "amd-gfx" From: "Jesse.Zhang" [ Upstream commit ad7c088e31f026d71fe87fd09473fafb7d6ed006 ] The mes_v11_0_reset_hw_queue and mes_v12_0_reset_hw_queue functions were using the wrong union type (MESAPI__REMOVE_QUEUE) when getting the offset for api_status. Since these functions handle queue reset operations, they should use MESAPI__RESET union instead. This fixes the polling of API status during hardware queue reset operations in the MES for both v11 and v12 versions. Signed-off-by: Jesse Zhang Reviewed-By: Shaoyun.liu Reviewed-by: Prike Liang Signed-off-by: Alex Deucher Signed-off-by: Sasha Levin --- **YES** This commit should be backported to stable kernel trees based on the following analysis: ## Bug Analysis The commit fixes a clear functional bug where `mes_v11_0_reset_hw_queue()` and `mes_v12_0_reset_hw_queue()` functions were using the wrong union type (`MESAPI__REMOVE_QUEUE`) to get the API status offset for polling completion. Since these functions handle **reset** operations, they should use the `MESAPI__RESET` union instead. ## Code Changes Assessment 1. **Small and contained**: The fix changes only 2 lines across 2 files: - `mes_v11_0.c:480`: `offsetof(union MESAPI__REMOVE_QUEUE, api_status)` → `offsetof(union MESAPI__RESET, api_status)` - `mes_v12_0.c:500`: Same change 2. **Logical correctness**: The functions create `union MESAPI__RESET mes_reset_queue_pkt` packets but were polling using the wrong union offset. This is a clear mismatch that could cause incorrect polling behavior. 3. **No architectural changes**: This is purely a bug fix that aligns the API status polling with the correct packet type. ## Impact Assessment - **Affects GPU queue management**: MES (Micro Engine Scheduler) queue reset is a critical operation for AMD GPUs - **Potential for silent failures**: Wrong offset polling could lead to improper completion detection - **User-visible impact**: Could cause GPU hangs or incorrect queue state management - **Low regression risk**: The fix aligns the code with its intended design ## Comparison with Similar Commits All 5 provided similar commits were marked "NO" for backporting because they: - Added new APIs/features (commits #1, #2) - Made functional changes to queue reset behavior (commits #3, #4, #5) In contrast, this commit: - Fixes an existing bug without adding features - Maintains existing behavior while correcting implementation - Follows the stable tree rule of "important bugfixes with minimal risk" ## Stable Tree Criteria Met ✅ **Important bugfix**: Fixes incorrect API status polling in GPU queue reset ✅ **Minimal risk**: Two-line change with clear logic ✅ **No new features**: Pure correctness fix ✅ **Contained change**: Limited to MES driver subsystem ✅ **Clear side effects**: Improves reliability of queue reset operations This commit represents exactly the type of focused bug fix that stable trees are designed to include. drivers/gpu/drm/amd/amdgpu/mes_v11_0.c | 2 +- drivers/gpu/drm/amd/amdgpu/mes_v12_0.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/gpu/drm/amd/amdgpu/mes_v11_0.c b/drivers/gpu/drm/amd/amdgpu/mes_v11_0.c index ef9538fbbf537..480283da18454 100644 --- a/drivers/gpu/drm/amd/amdgpu/mes_v11_0.c +++ b/drivers/gpu/drm/amd/amdgpu/mes_v11_0.c @@ -480,7 +480,7 @@ static int mes_v11_0_reset_hw_queue(struct amdgpu_mes *mes, return mes_v11_0_submit_pkt_and_poll_completion(mes, &mes_reset_queue_pkt, sizeof(mes_reset_queue_pkt), - offsetof(union MESAPI__REMOVE_QUEUE, api_status)); + offsetof(union MESAPI__RESET, api_status)); } static int mes_v11_0_map_legacy_queue(struct amdgpu_mes *mes, diff --git a/drivers/gpu/drm/amd/amdgpu/mes_v12_0.c b/drivers/gpu/drm/amd/amdgpu/mes_v12_0.c index e6ab617b9a404..624c6b4e452c8 100644 --- a/drivers/gpu/drm/amd/amdgpu/mes_v12_0.c +++ b/drivers/gpu/drm/amd/amdgpu/mes_v12_0.c @@ -500,7 +500,7 @@ static int mes_v12_0_reset_hw_queue(struct amdgpu_mes *mes, return mes_v12_0_submit_pkt_and_poll_completion(mes, pipe, &mes_reset_queue_pkt, sizeof(mes_reset_queue_pkt), - offsetof(union MESAPI__REMOVE_QUEUE, api_status)); + offsetof(union MESAPI__RESET, api_status)); } static int mes_v12_0_map_legacy_queue(struct amdgpu_mes *mes, -- 2.39.5