From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 18FB6175A64; Sat, 28 Feb 2026 17:35:34 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772300134; cv=none; b=m3UhnIlriwPLcwUJlMXgK4lbZGtHHn5dMjrGzcmIxbQWkujborMQTUxIJYsJAQ+kz+lnhbEKG1P7eztjb/Sj/4zlq1/FToW3Wout6zz46F2LzYMYBfMET8jRPpRXrO7uix3NpHx8nBOLfvNM4LhnqAjZXLJIABLI0WVKgr40Dk8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772300134; c=relaxed/simple; bh=9GRg/vEWRTZndN1XDb01T9HHR2UThmDcPOMlOFyB4SY=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version:Content-Type; b=T7C8oWIPAv8XEE9pKr/bEm2xYJdIxBG7Lb5bNHOoEaaQxyUqQNGZGSSy9IRzQnq9K2OBzoz3DHXQPLnoKYP/RoJE88DjQrBdQ8PhnOhlzM0PQypefau5G87EovP9FAnfUEQr4E0FgM8EXiIlkwZG7yD94otjDzc6Mpv0xKxxRVo= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=H5oBOAsb; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="H5oBOAsb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 69BA8C116D0; Sat, 28 Feb 2026 17:35:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772300134; bh=9GRg/vEWRTZndN1XDb01T9HHR2UThmDcPOMlOFyB4SY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=H5oBOAsbbu8cN9k2Bsrb4acI8AQ5sXAy5HRHqeil5Mn5xwPF1/U0AsPOnV1MP4Suw /btEgDLya1+KCjX1z9uF8RsLJHGFS36woYSb02mU9OnKI/V/5CU6ZuWgOjrhjyzH+0 7ND4CyBFnftMSwUwpD80yKJN4NvmLEwwemcYchYiOhjZrSvvXoP2ngzZBK1q7MPx6I Fj4txk/wRWtTvrKk+eyEdw6CpLW0SmHKQQuOH/7lzfZc/27C69K5Re/vQkqd0BDMg3 lA3S7UoPQ6Hl8DyrR7ne6sOPhiPz4ubzNCb4I7vGYpIHEkOaZc6ZlTosdcAKWKGvpe 98lfgU5NIhlhw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Xiaolei Wang , =?UTF-8?q?Ma=C3=ADra=20Canal?= , Sasha Levin Subject: [PATCH 6.19 151/844] drm/v3d: Set DMA segment size to avoid debug warnings Date: Sat, 28 Feb 2026 12:21:04 -0500 Message-ID: <20260228173244.1509663-152-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260228173244.1509663-1-sashal@kernel.org> References: <20260228173244.1509663-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit From: Xiaolei Wang [ Upstream commit 9eb018828b1b30dfba689c060735c50fc5b9f704 ] When using V3D rendering with CONFIG_DMA_API_DEBUG enabled, the kernel occasionally reports a segment size mismatch. This is because 'max_seg_size' is not set. The kernel defaults to 64K. setting 'max_seg_size' to the maximum will prevent 'debug_dma_map_sg()' from complaining about the over-mapping of the V3D segment length. DMA-API: v3d 1002000000.v3d: mapping sg segment longer than device claims to support [len=8290304] [max=65536] WARNING: CPU: 0 PID: 493 at kernel/dma/debug.c:1179 debug_dma_map_sg+0x330/0x388 CPU: 0 UID: 0 PID: 493 Comm: Xorg Not tainted 6.12.53-yocto-standard #1 Hardware name: Raspberry Pi 5 Model B Rev 1.0 (DT) pstate: 60400009 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : debug_dma_map_sg+0x330/0x388 lr : debug_dma_map_sg+0x330/0x388 sp : ffff8000829a3ac0 x29: ffff8000829a3ac0 x28: 0000000000000001 x27: ffff8000813fe000 x26: ffffc1ffc0000000 x25: ffff00010fdeb760 x24: 0000000000000000 x23: ffff8000816a9bf0 x22: 0000000000000001 x21: 0000000000000002 x20: 0000000000000002 x19: ffff00010185e810 x18: ffffffffffffffff x17: 69766564206e6168 x16: 74207265676e6f6c x15: 20746e656d676573 x14: 20677320676e6970 x13: 5d34303334393134 x12: 0000000000000000 x11: 00000000000000c0 x10: 00000000000009c0 x9 : ffff8000800e0b7c x8 : ffff00010a315ca0 x7 : ffff8000816a5110 x6 : 0000000000000001 x5 : 000000000000002b x4 : 0000000000000002 x3 : 0000000000000008 x2 : 0000000000000000 x1 : 0000000000000000 x0 : ffff00010a315280 Call trace: debug_dma_map_sg+0x330/0x388 __dma_map_sg_attrs+0xc0/0x278 dma_map_sgtable+0x30/0x58 drm_gem_shmem_get_pages_sgt+0xb4/0x140 v3d_bo_create_finish+0x28/0x130 [v3d] v3d_create_bo_ioctl+0x54/0x180 [v3d] drm_ioctl_kernel+0xc8/0x140 drm_ioctl+0x2d4/0x4d8 Signed-off-by: Xiaolei Wang Link: https://patch.msgid.link/20251203130323.2247072-1-xiaolei.wang@windriver.com Signed-off-by: Maíra Canal Signed-off-by: Sasha Levin --- drivers/gpu/drm/v3d/v3d_drv.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/v3d/v3d_drv.c b/drivers/gpu/drm/v3d/v3d_drv.c index e8a46c8bad8a2..f469de456f9bb 100644 --- a/drivers/gpu/drm/v3d/v3d_drv.c +++ b/drivers/gpu/drm/v3d/v3d_drv.c @@ -378,6 +378,8 @@ static int v3d_platform_drm_probe(struct platform_device *pdev) if (ret) goto clk_disable; + dma_set_max_seg_size(&pdev->dev, UINT_MAX); + v3d->va_width = 30 + V3D_GET_FIELD(mmu_debug, V3D_MMU_VA_WIDTH); ident1 = V3D_READ(V3D_HUB_IDENT1); -- 2.51.0