From nobody Sat Feb 7 22:55:22 2026 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 E4ABA137C30; Wed, 27 Mar 2024 12:08:18 +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=1711541299; cv=none; b=o5VzOESqDZlOKMmTsFstSyE9HpvjD3AeDmxhs+prXb8FtHbmtvoSdL1unkf8I6/s4PRlG1O1LgM+FQ89FxtqTj3PUyjenFv/hnTMkTaaKlJ4RGU7T4gfozC7YUuI8/AtJ1wAJXqtK2IavNz5IvLxrgqfom5BwU4HJaMFtBsaYpk= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1711541299; c=relaxed/simple; bh=o2jl+DOgHAxIMe3E9PEMDyJqKN7SCl1t/32FlL9O1Uc=; h=From:To:Cc:Subject:Date:Message-ID:MIME-Version; b=t1kFYRKfqy9LlmfH2ajHcfr4mP6ZImTwDAbmcgQrVjMSPN0k63L9zY9fEFu8b6DtUchtKZwnIq0PEvWTx46+9MS7y6bKMQd+c4dhCkFlEx7fQnXMnH+BnOgamsadzVPVnsjADgdUjy7B02QmwYTas8zmheMhBeH9WaGdiNCzbF8= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=jQ5U0qdv; 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="jQ5U0qdv" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 82C4EC43390; Wed, 27 Mar 2024 12:08:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1711541298; bh=o2jl+DOgHAxIMe3E9PEMDyJqKN7SCl1t/32FlL9O1Uc=; h=From:To:Cc:Subject:Date:From; b=jQ5U0qdvN99g1LNbde9GBB7aa53qwfMq+6WDZCK+8aiN0AO3In6vFJK4RyHNtg31X 2cC4D7MZhVkVBshuLiezKeSd7EUkVZXuG68NxQjl3k2besQBX/4NNx+hNfQO7+4Lxf jqLw+UKxJzdePoQkgrFAYqBqQPcyQpmtAExS1cZtG78DMgU7FKwiDizT3kvJio/Aco yzGajm5ZthFuPNJU4TXoropTdbS5CiqiIOE5BGftPSnM4CeNUeMp24VdUw4k63sPHJ WClTjb/xAVEb6VX3miHihaOlPthw1He0VqaWR/4V8MJ8uYsr+fhZwBjygIuP5NWjVq k4IP2Z9YEWOQQ== From: Sasha Levin To: stable@vger.kernel.org, jerry.zuo@amd.com Cc: Wayne Lin , Hamza Mahfooz , Alex Deucher , amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Subject: FAILED: Patch "drm/amd/display: Fix MST Null Ptr for RV" failed to apply to 6.8-stable tree Date: Wed, 27 Mar 2024 08:08:16 -0400 Message-ID: <20240327120816.2826066-1-sashal@kernel.org> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Patchwork-Hint: ignore X-stable: review Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The patch below does not apply to the 6.8-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to . Thanks, Sasha Acked-by: Hamza Mahfooz Reviewed-by: Wayne Lin ------------------ original commit in Linus's tree ------------------ From 1b5b72b4d67c1e72c4fc19151fd669acecc92faa Mon Sep 17 00:00:00 2001 From: Fangzhi Zuo Date: Mon, 22 Jan 2024 13:43:46 -0500 Subject: [PATCH] drm/amd/display: Fix MST Null Ptr for RV The change try to fix below error specific to RV platform: BUG: kernel NULL pointer dereference, address: 0000000000000008 PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 4 PID: 917 Comm: sway Not tainted 6.3.9-arch1-1 #1 124dc55df4f5272ccb4= 09f39ef4872fc2b3376a2 Hardware name: LENOVO 20NKS01Y00/20NKS01Y00, BIOS R12ET61W(1.31 ) 07/28/2022 RIP: 0010:drm_dp_atomic_find_time_slots+0x5e/0x260 [drm_display_helper] Code: 01 00 00 48 8b 85 60 05 00 00 48 63 80 88 00 00 00 3b 43 28 0f 8d 2e = 01 00 00 48 8b 53 30 48 8d 04 80 48 8d 04 c2 48 8b 40 18 <48> 8> RSP: 0018:ffff960cc2df77d8 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff8afb87e81280 RCX: 0000000000000224 RDX: ffff8afb9ee37c00 RSI: ffff8afb8da1a578 RDI: ffff8afb87e81280 RBP: ffff8afb83d67000 R08: 0000000000000001 R09: ffff8afb9652f850 R10: ffff960cc2df7908 R11: 0000000000000002 R12: 0000000000000000 R13: ffff8afb8d7688a0 R14: ffff8afb8da1a578 R15: 0000000000000224 FS: 00007f4dac35ce00(0000) GS:ffff8afe30b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000008 CR3: 000000010ddc6000 CR4: 00000000003506e0 Call Trace: ? __die+0x23/0x70 ? page_fault_oops+0x171/0x4e0 ? plist_add+0xbe/0x100 ? exc_page_fault+0x7c/0x180 ? asm_exc_page_fault+0x26/0x30 ? drm_dp_atomic_find_time_slots+0x5e/0x260 [drm_display_helper 0e677236964= 38d8e02b741593dd50d80b44c2026] ? drm_dp_atomic_find_time_slots+0x28/0x260 [drm_display_helper 0e677236964= 38d8e02b741593dd50d80b44c2026] compute_mst_dsc_configs_for_link+0x2ff/0xa40 [amdgpu 62e600d2a75e9158e1cd0= a243bdc8e6da040c054] ? fill_plane_buffer_attributes+0x419/0x510 [amdgpu 62e600d2a75e9158e1cd0a2= 43bdc8e6da040c054] compute_mst_dsc_configs_for_state+0x1e1/0x250 [amdgpu 62e600d2a75e9158e1cd= 0a243bdc8e6da040c054] amdgpu_dm_atomic_check+0xecd/0x1190 [amdgpu 62e600d2a75e9158e1cd0a243bdc8e= 6da040c054] drm_atomic_check_only+0x5c5/0xa40 drm_mode_atomic_ioctl+0x76e/0xbc0 ? _copy_to_user+0x25/0x30 ? drm_ioctl+0x296/0x4b0 ? __pfx_drm_mode_atomic_ioctl+0x10/0x10 drm_ioctl_kernel+0xcd/0x170 drm_ioctl+0x26d/0x4b0 ? __pfx_drm_mode_atomic_ioctl+0x10/0x10 amdgpu_drm_ioctl+0x4e/0x90 [amdgpu 62e600d2a75e9158e1cd0a243bdc8e6da040c05= 4] __x64_sys_ioctl+0x94/0xd0 do_syscall_64+0x60/0x90 ? do_syscall_64+0x6c/0x90 entry_SYSCALL_64_after_hwframe+0x72/0xdc RIP: 0033:0x7f4dad17f76f Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 24 10 00 00 00 48 89 44 = 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 <89> c> RSP: 002b:00007ffd9ae859f0 EFLAGS: 00000246 ORIG_RAX: 0000000000000010 RAX: ffffffffffffffda RBX: 000055e255a55900 RCX: 00007f4dad17f76f RDX: 00007ffd9ae85a90 RSI: 00000000c03864bc RDI: 000000000000000b RBP: 00007ffd9ae85a90 R08: 0000000000000003 R09: 0000000000000003 R10: 0000000000000000 R11: 0000000000000246 R12: 00000000c03864bc R13: 000000000000000b R14: 000055e255a7fc60 R15: 000055e255a01eb0 Modules linked in: rfcomm snd_seq_dummy snd_hrtimer snd_seq snd_seq_device = ccm cmac algif_hash algif_skcipher af_alg joydev mousedev bnep > typec libphy k10temp ipmi_msghandler roles i2c_scmi acpi_cpufreq mac_hid n= ft_reject_inet nf_reject_ipv4 nf_reject_ipv6 nft_reject nft_mas> CR2: 0000000000000008 ---[ end trace 0000000000000000 ]--- RIP: 0010:drm_dp_atomic_find_time_slots+0x5e/0x260 [drm_display_helper] Code: 01 00 00 48 8b 85 60 05 00 00 48 63 80 88 00 00 00 3b 43 28 0f 8d 2e = 01 00 00 48 8b 53 30 48 8d 04 80 48 8d 04 c2 48 8b 40 18 <48> 8> RSP: 0018:ffff960cc2df77d8 EFLAGS: 00010293 RAX: 0000000000000000 RBX: ffff8afb87e81280 RCX: 0000000000000224 RDX: ffff8afb9ee37c00 RSI: ffff8afb8da1a578 RDI: ffff8afb87e81280 RBP: ffff8afb83d67000 R08: 0000000000000001 R09: ffff8afb9652f850 R10: ffff960cc2df7908 R11: 0000000000000002 R12: 0000000000000000 R13: ffff8afb8d7688a0 R14: ffff8afb8da1a578 R15: 0000000000000224 FS: 00007f4dac35ce00(0000) GS:ffff8afe30b00000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000000000008 CR3: 000000010ddc6000 CR4: 00000000003506e0 With a second DP monitor connected, drm_atomic_state in dm atomic check sequence does not include the connector state for the old/existing/first DP monitor. In such case, dsc determination policy would hit a null ptr when it tries to iterate the old/existing stream that does not have a valid connector state attached to it. When that happens, dm atomic check should call drm_atomic_get_connector_state for a new connector state. Existing dm has already done that, except for RV due to it does not have official support of dsc where .num_dsc is not defined in dcn10 resource cap, that prevent from getting drm_atomic_get_connector_state called. So, skip dsc determination policy for ASICs that don't have DSC support. Cc: stable@vger.kernel.org # 6.1+ Link: https://gitlab.freedesktop.org/drm/amd/-/issues/2314 Reviewed-by: Wayne Lin Acked-by: Hamza Mahfooz Signed-off-by: Fangzhi Zuo Signed-off-by: Alex Deucher --- drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 12 +++++++----- 1 file changed, 7 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gp= u/drm/amd/display/amdgpu_dm/amdgpu_dm.c index 5fe8dc6536966..b7a717c3682f9 100644 --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c @@ -10859,11 +10859,13 @@ static int amdgpu_dm_atomic_check(struct drm_devi= ce *dev, goto fail; } =20 - ret =3D compute_mst_dsc_configs_for_state(state, dm_state->context, vars= ); - if (ret) { - DRM_DEBUG_DRIVER("compute_mst_dsc_configs_for_state() failed\n"); - ret =3D -EINVAL; - goto fail; + if (dc_resource_is_dsc_encoding_supported(dc)) { + ret =3D compute_mst_dsc_configs_for_state(state, dm_state->context, var= s); + if (ret) { + DRM_DEBUG_DRIVER("compute_mst_dsc_configs_for_state() failed\n"); + ret =3D -EINVAL; + goto fail; + } } =20 ret =3D dm_update_mst_vcpi_slots_for_dsc(state, dm_state->context, vars); --=20 2.43.0