Message-Id: <20220607165008.065260983@linuxfoundation.org>
Date:   Tue,  7 Jun 2022 18:54:58 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Hans de Goede <hdegoede@...hat.com>,
        Alex Deucher <alexander.deucher@....com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.18 180/879] drm/amdgpu: Move mutex_init(&smu->message_lock) to smu_early_init()

From: Hans de Goede <hdegoede@...hat.com>

[ Upstream commit 4b9caaa0281972ca5ea4e1cdac2e12b9df1ae00b ]

Lockdep complains about the smu->message_lock mutex being used before
it is initialized through the following call path:

amdgpu_device_init()
 amdgpu_dpm_mode2_reset()
  smu_mode2_reset()
   smu_v12_0_mode2_reset()
    smu_cmn_send_smc_msg_with_param()

Move the mutex_init() call to smu_early_init() to fix the mutex being
used before it is initialized.

This fixes the following lockdep splat:

[    3.867331] ------------[ cut here ]------------
[    3.867335] fbcon: Taking over console
[    3.867338] DEBUG_LOCKS_WARN_ON(lock->magic != lock)
[    3.867340] WARNING: CPU: 14 PID: 491 at kernel/locking/mutex.c:579 __mutex_lock+0x44c/0x830
[    3.867349] Modules linked in: amdgpu(+) crct10dif_pclmul drm_ttm_helper crc32_pclmul ttm crc32c_intel ghash_clmulni_intel hid_lg_g15 iommu_v2 sp5100_tco nvme gpu_sched drm_dp_helper nvme_core ccp wmi video hid_logitech_dj ip6_tables ip_tables ipmi_devintf ipmi_msghandler fuse i2c_dev
[    3.867363] CPU: 14 PID: 491 Comm: systemd-udevd Tainted: G          I       5.18.0-rc5+ #33
[    3.867366] Hardware name: Micro-Star International Co., Ltd. MS-7C95/B550M PRO-VDH WIFI (MS-7C95), BIOS 2.90 12/23/2021
[    3.867369] RIP: 0010:__mutex_lock+0x44c/0x830
[    3.867372] Code: ff 85 c0 0f 84 33 fc ff ff 8b 0d b7 50 25 01 85 c9 0f 85 25 fc ff ff 48 c7 c6 fb 41 82 99 48 c7 c7 6b 63 80 99 e8 88 2a f8 ff <0f> 0b e9 0b fc ff ff f6 83 b9 0c 00 00 01 0f 85 64 ff ff ff 4c 89
[    3.867377] RSP: 0018:ffffaef8c0fc79f0 EFLAGS: 00010286
[    3.867380] RAX: 0000000000000028 RBX: 0000000000000000 RCX: 0000000000000027
[    3.867382] RDX: ffff9ccc0dda0928 RSI: 0000000000000001 RDI: ffff9ccc0dda0920
[    3.867384] RBP: ffffaef8c0fc7a80 R08: 0000000000000000 R09: ffffaef8c0fc7820
[    3.867386] R10: 0000000000000003 R11: ffff9ccc2a2fffe8 R12: 0000000000000002
[    3.867388] R13: ffff9cc990808058 R14: 0000000000000000 R15: ffff9cc98bfc0000
[    3.867390] FS:  00007fc4d830f580(0000) GS:ffff9ccc0dd80000(0000) knlGS:0000000000000000
[    3.867394] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[    3.867396] CR2: 0000560a77031410 CR3: 000000010f522000 CR4: 0000000000750ee0
[    3.867398] PKRU: 55555554
[    3.867399] Call Trace:
[    3.867401]  <TASK>
[    3.867403]  ? smu_cmn_send_smc_msg_with_param+0x98/0x240 [amdgpu]
[    3.867533]  ? __mutex_lock+0x90/0x830
[    3.867535]  ? amdgpu_dpm_mode2_reset+0x37/0x60 [amdgpu]
[    3.867653]  ? smu_cmn_send_smc_msg_with_param+0x98/0x240 [amdgpu]
[    3.867758]  smu_cmn_send_smc_msg_with_param+0x98/0x240 [amdgpu]
[    3.867857]  smu_mode2_reset+0x2b/0x50 [amdgpu]
[    3.867953]  amdgpu_dpm_mode2_reset+0x46/0x60 [amdgpu]
[    3.868096]  amdgpu_device_init.cold+0x1069/0x1e78 [amdgpu]
[    3.868219]  ? _raw_spin_unlock_irqrestore+0x30/0x50
[    3.868222]  ? pci_conf1_read+0x9b/0xf0
[    3.868226]  amdgpu_driver_load_kms+0x15/0x110 [amdgpu]
[    3.868314]  amdgpu_pci_probe+0x1a9/0x3c0 [amdgpu]
[    3.868398]  local_pci_probe+0x41/0x80
[    3.868401]  pci_device_probe+0xab/0x200
[    3.868404]  really_probe+0x1a1/0x370
[    3.868407]  __driver_probe_device+0xfc/0x170
[    3.868410]  driver_probe_device+0x1f/0x90
[    3.868412]  __driver_attach+0xbf/0x1a0
[    3.868414]  ? __device_attach_driver+0xe0/0xe0
[    3.868416]  bus_for_each_dev+0x65/0x90
[    3.868419]  bus_add_driver+0x151/0x1f0
[    3.868421]  driver_register+0x89/0xd0
[    3.868423]  ? 0xffffffffc0bd4000
[    3.868425]  do_one_initcall+0x5d/0x300
[    3.868428]  ? do_init_module+0x22/0x240
[    3.868431]  ? rcu_read_lock_sched_held+0x3c/0x70
[    3.868434]  ? trace_kmalloc+0x30/0xe0
[    3.868437]  ? kmem_cache_alloc_trace+0x1e6/0x3a0
[    3.868440]  do_init_module+0x4a/0x240
[    3.868442]  __do_sys_finit_module+0x93/0xf0
[    3.868446]  do_syscall_64+0x5b/0x80
[    3.868449]  ? rcu_read_lock_sched_held+0x3c/0x70
[    3.868451]  ? lockdep_hardirqs_on_prepare+0xd9/0x180
[    3.868454]  ? do_syscall_64+0x67/0x80
[    3.868456]  ? do_syscall_64+0x67/0x80
[    3.868458]  ? do_syscall_64+0x67/0x80
[    3.868460]  ? do_syscall_64+0x67/0x80
[    3.868462]  entry_SYSCALL_64_after_hwframe+0x44/0xae
[    3.868465] RIP: 0033:0x7fc4d8ec1ced
[    3.868467] Code: 5d c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 8b 0d fb 70 0e 00 f7 d8 64 89 01 48
[    3.868472] RSP: 002b:00007fff687ae6b8 EFLAGS: 00000246 ORIG_RAX: 0000000000000139
[    3.868475] RAX: ffffffffffffffda RBX: 0000560a76fbca60 RCX: 00007fc4d8ec1ced
[    3.868477] RDX: 0000000000000000 RSI: 00007fc4d902343c RDI: 0000000000000011
[    3.868479] RBP: 00007fc4d902343c R08: 0000000000000000 R09: 0000560a76fb59c0
[    3.868481] R10: 0000000000000011 R11: 0000000000000246 R12: 0000000000020000
[    3.868484] R13: 0000560a76f8bfd0 R14: 0000000000000000 R15: 0000560a76fc2d10
[    3.868487]  </TASK>
[    3.868489] irq event stamp: 120617
[    3.868490] hardirqs last  enabled at (120617): [<ffffffff9817169e>] __up_console_sem+0x5e/0x70
[    3.868494] hardirqs last disabled at (120616): [<ffffffff98171683>] __up_console_sem+0x43/0x70
[    3.868497] softirqs last  enabled at (119684): [<ffffffff980ee83a>] __irq_exit_rcu+0xca/0x100
[    3.868501] softirqs last disabled at (119679): [<ffffffff980ee83a>] __irq_exit_rcu+0xca/0x100
[    3.868504] ---[ end trace 0000000000000000 ]---

Signed-off-by: Hans de Goede <hdegoede@...hat.com>
Signed-off-by: Alex Deucher <alexander.deucher@....com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
index f10a0256413e..32cff21f261c 100644
--- a/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
+++ b/drivers/gpu/drm/amd/pm/swsmu/amdgpu_smu.c
@@ -576,6 +576,8 @@ static int smu_early_init(void *handle)
 	smu->smu_baco.platform_support = false;
 	smu->user_dpm_profile.fan_mode = -1;
 
+	mutex_init(&smu->message_lock);
+
 	adev->powerplay.pp_handle = smu;
 	adev->powerplay.pp_funcs = &swsmu_pm_funcs;
 
@@ -975,8 +977,6 @@ static int smu_sw_init(void *handle)
 	bitmap_zero(smu->smu_feature.supported, SMU_FEATURE_MAX);
 	bitmap_zero(smu->smu_feature.allowed, SMU_FEATURE_MAX);
 
-	mutex_init(&smu->message_lock);
-
 	INIT_WORK(&smu->throttling_logging_work, smu_throttling_logging_work_fn);
 	INIT_WORK(&smu->interrupt_work, smu_interrupt_work_fn);
 	atomic64_set(&smu->throttle_int_counter, 0);
-- 
2.35.1

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