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Message-ID: <99b3096f-ece2-f130-e86f-0e84c8315ff4@gmail.com>
Date: Mon, 17 Jun 2019 18:28:21 +0200
From: Matthias Brugger <matthias.bgg@...il.com>
To: Pi-Hsun Shih <pihsun@...omium.org>, Yong Wu <yong.wu@...iatek.com>
Cc: Joerg Roedel <joro@...tes.org>,
Robin Murphy <robin.murphy@....com>,
Rob Herring <robh+dt@...nel.org>,
Evan Green <evgreen@...omium.org>,
Tomasz Figa <tfiga@...gle.com>,
Will Deacon <will.deacon@....com>,
"moderated list:ARM/Mediatek SoC support"
<linux-mediatek@...ts.infradead.org>, srv_heupstream@...iatek.com,
"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
<devicetree@...r.kernel.org>,
open list <linux-kernel@...r.kernel.org>,
"moderated list:ARM/Mediatek SoC support"
<linux-arm-kernel@...ts.infradead.org>,
iommu@...ts.linux-foundation.org, yingjoe.chen@...iatek.com,
youlin.pei@...iatek.com, Nicolas Boichat <drinkcat@...omium.org>,
anan.sun@...iatek.com, Matthias Kaehlcke <mka@...omium.org>
Subject: Re: [PATCH v7 16/21] memory: mtk-smi: Add bus_sel for mt8183
On 13/06/2019 10:20, Pi-Hsun Shih wrote:
> (Sorry for the possibly double-posting, my last mail got rejected by
> some mailing lists.)
>
> Hi,
> When I tested this patch series (Based on linux 5.2.0-rc2, and with
> various other patch series about MT8183) with lockdep enabled, and I'm
> seeing the following lockdep warning on boot.
>
> By bisecting the commits, the first commit that introduce this warning
> is this patch. The warning also doesn't appear if
Are you sure about this?
>From the lockdep call graph it looks more like patch
[PATCH v7 15/21] memory: mtk-smi: Invoke pm runtime_callback to enable clocks
has something to do with it.
But not an expert either, sorry.
Regards,
Matthias
> https://lore.kernel.org/patchwork/patch/1086582/ and
> https://lore.kernel.org/patchwork/patch/1086583/ are not applied.
>
> Do anyone have idea on why this is happening, or any suggestion on
> which part I should be digging into to figure this out? Thanks.
>
> [ 4.664194] ======================================================
> [ 4.670368] WARNING: possible circular locking dependency detected
> [ 4.676545] 5.2.0-rc2-next-20190528-44527-g6c94b6475c04 #20 Tainted: G S
> [ 4.684539] ------------------------------------------------------
> [ 4.690714] kworker/4:1/51 is trying to acquire lock:
> [ 4.695760] (____ptrval____) (regulator_list_mutex){+.+.},
> at:regulator_lock_dependent+0xdc/0x6c4
> [ 4.704732]
> [ 4.704732] but task is already holding lock:
> [ 4.710556] (____ptrval____) (&genpd->mlock/1){+.+.},
> at:genpd_lock_nested_mtx+0x24/0x30
> [ 4.718740]
> [ 4.718740] which lock already depends on the new lock.
> [ 4.718740]
> [ 4.726908]
> [ 4.726908] the existing dependency chain (in reverse order) is:
> [ 4.734382]
> [ 4.734382] -> #4 (&genpd->mlock/1){+.+.}:
> [ 4.739963] __mutex_lock_common+0x1a0/0x1fe8
> [ 4.744836] mutex_lock_nested+0x40/0x50
> [ 4.749275] genpd_lock_nested_mtx+0x24/0x30
> [ 4.754063] genpd_add_subdomain+0x150/0x524
> [ 4.758850] pm_genpd_add_subdomain+0x3c/0x5c
> [ 4.763723] scpsys_probe+0x520/0xe78
> [ 4.767902] platform_drv_probe+0xf4/0x134
> [ 4.772517] really_probe+0x214/0x4dc
> [ 4.776696] driver_probe_device+0xcc/0x1d4
> [ 4.781396] __device_attach_driver+0x10c/0x180
> [ 4.786442] bus_for_each_drv+0x124/0x184
> [ 4.790968] __device_attach+0x1c0/0x2d8
> [ 4.795407] device_initial_probe+0x20/0x2c
> [ 4.800106] bus_probe_device+0x80/0x16c
> [ 4.804546] deferred_probe_work_func+0x120/0x168
> [ 4.809767] process_one_work+0x858/0x1208
> [ 4.814379] worker_thread+0x9ec/0xcb8
> [ 4.818644] kthread+0x2b8/0x2d0
> [ 4.822391] ret_from_fork+0x10/0x18
> [ 4.826480]
> [ 4.826480] -> #3 (&genpd->mlock){+.+.}:
> [ 4.831880] __mutex_lock_common+0x1a0/0x1fe8
> [ 4.836752] mutex_lock_nested+0x40/0x50
> [ 4.841190] genpd_lock_mtx+0x20/0x2c
> [ 4.845369] genpd_runtime_resume+0x140/0x434
> [ 4.850241] __rpm_callback+0xb0/0x1e4
> [ 4.854506] rpm_callback+0x54/0x1a8
> [ 4.858597] rpm_resume+0xc6c/0x10c4
> [ 4.862689] __pm_runtime_resume+0xb4/0x124
> [ 4.867387] device_link_add+0x598/0x8d0
> [ 4.871829] mtk_smi_larb_probe+0x2b0/0x340
> [ 4.876528] platform_drv_probe+0xf4/0x134
> [ 4.881141] really_probe+0x214/0x4dc
> [ 4.885320] driver_probe_device+0xcc/0x1d4
> [ 4.890020] __device_attach_driver+0x10c/0x180
> [ 4.895066] bus_for_each_drv+0x124/0x184
> [ 4.899591] __device_attach+0x1c0/0x2d8
> [ 4.904031] device_initial_probe+0x20/0x2c
> [ 4.908730] bus_probe_device+0x80/0x16c
> [ 4.913169] deferred_probe_work_func+0x120/0x168
> [ 4.918387] process_one_work+0x858/0x1208
> [ 4.923000] worker_thread+0x9ec/0xcb8
> [ 4.927264] kthread+0x2b8/0x2d0
> [ 4.931009] ret_from_fork+0x10/0x18
> [ 4.935098]
> [ 4.935098] -> #2 (dpm_list_mtx){+.+.}:
> [ 4.940412] __mutex_lock_common+0x1a0/0x1fe8
> [ 4.945284] mutex_lock_nested+0x40/0x50
> [ 4.949722] device_pm_lock+0x1c/0x24
> [ 4.953900] device_link_add+0x98/0x8d0
> [ 4.958252] _regulator_get+0x3f0/0x504
> [ 4.962606] _devm_regulator_get+0x58/0xb8
> [ 4.967218] devm_regulator_get+0x28/0x34
> [ 4.971746] pwm_backlight_probe+0x61c/0x1b90
> [ 4.976617] platform_drv_probe+0xf4/0x134
> [ 4.981230] really_probe+0x214/0x4dc
> [ 4.985409] driver_probe_device+0xcc/0x1d4
> [ 4.990108] device_driver_attach+0xe4/0x104
> [ 4.994894] __driver_attach+0x134/0x14c
> [ 4.999333] bus_for_each_dev+0x120/0x180
> [ 5.003859] driver_attach+0x48/0x54
> [ 5.007950] bus_add_driver+0x2ac/0x44c
> [ 5.012303] driver_register+0x160/0x288
> [ 5.016742] __platform_driver_register+0xcc/0xdc
> [ 5.021964] pwm_backlight_driver_init+0x1c/0x24
> [ 5.027097] do_one_initcall+0x38c/0x994
> [ 5.031536] do_initcall_level+0x3a4/0x4b8
> [ 5.036148] do_basic_setup+0x84/0xa0
> [ 5.036153] kernel_init_freeable+0x23c/0x324
> [ 5.036158] kernel_init+0x14/0x110
> [ 5.036164] ret_from_fork+0x10/0x18
> [ 5.036166]
> [ 5.036166] -> #1 (device_links_lock){+.+.}:
> [ 5.065905] __mutex_lock_common+0x1a0/0x1fe8
> [ 5.070777] mutex_lock_nested+0x40/0x50
> [ 5.075215] device_link_remove+0x40/0xe0
> [ 5.079740] _regulator_put+0x104/0x2d8
> [ 5.084093] regulator_put+0x30/0x44
> [ 5.088184] devm_regulator_release+0x38/0x44
> [ 5.093056] release_nodes+0x604/0x670
> [ 5.097320] devres_release_all+0x70/0x8c
> [ 5.101846] really_probe+0x270/0x4dc
> [ 5.106024] driver_probe_device+0xcc/0x1d4
> [ 5.110724] device_driver_attach+0xe4/0x104
> [ 5.115510] __driver_attach+0x134/0x14c
> [ 5.119949] bus_for_each_dev+0x120/0x180
> [ 5.124474] driver_attach+0x48/0x54
> [ 5.128566] bus_add_driver+0x2ac/0x44c
> [ 5.132919] driver_register+0x160/0x288
> [ 5.137357] __platform_driver_register+0xcc/0xdc
> [ 5.142576] pwm_backlight_driver_init+0x1c/0x24
> [ 5.147708] do_one_initcall+0x38c/0x994
> [ 5.152146] do_initcall_level+0x3a4/0x4b8
> [ 5.156758] do_basic_setup+0x84/0xa0
> [ 5.160936] kernel_init_freeable+0x23c/0x324
> [ 5.165807] kernel_init+0x14/0x110
> [ 5.169813] ret_from_fork+0x10/0x18
> [ 5.173901]
> [ 5.173901] -> #0 (regulator_list_mutex){+.+.}:
> [ 5.179910] lock_acquire+0x350/0x4d4
> [ 5.184088] __mutex_lock_common+0x1a0/0x1fe8
> [ 5.184095] mutex_lock_nested+0x40/0x50
> [ 5.197475] regulator_lock_dependent+0xdc/0x6c4
> [ 5.197482] regulator_disable+0xa0/0x138
> [ 5.197487] scpsys_power_off+0x38c/0x4bc
> [ 5.197495] genpd_power_off+0x3d8/0x6a0
> [ 5.209399] genpd_power_off+0x530/0x6a0
> [ 5.209406] genpd_power_off_work_fn+0x74/0xc0
> [ 5.209411] process_one_work+0x858/0x1208
> [ 5.209419] worker_thread+0x9ec/0xcb8
> [ 5.219067] kthread+0x2b8/0x2d0
> [ 5.219073] ret_from_fork+0x10/0x18
> [ 5.219077]
> [ 5.219077] other info that might help us debug this:
> [ 5.219077]
> [ 5.219080] Chain exists of:
> [ 5.219080] regulator_list_mutex --> &genpd->mlock --> &genpd->mlock/1
> [ 5.219080]
> [ 5.228039] Possible unsafe locking scenario:
> [ 5.228039]
> [ 5.228042] CPU0 CPU1
> [ 5.228046] ---- ----
> [ 5.228048] lock(&genpd->mlock/1);
> [ 5.228058] lock(&genpd->mlock);
> [ 5.311647] lock(&genpd->mlock/1);
> [ 5.317736] lock(regulator_list_mutex);
> [ 5.321742]
> [ 5.321742] *** DEADLOCK ***
> [ 5.321742]
> [ 5.327655] 4 locks held by kworker/4:1/51:
> [ 5.331831] #0: (____ptrval____) ((wq_completion)pm){+.+.},
> at:process_one_work+0x57c/0x1208
> [ 5.340444] #1: (____ptrval____)
> ((work_completion)(&genpd->power_off_work)){+.+.},
> at:process_one_work+0x5b8/0x1208
> [ 5.351139] #2: (____ptrval____) (&genpd->mlock){+.+.},
> at:genpd_lock_mtx+0x20/0x2c
> [ 5.358970] #3: (____ptrval____) (&genpd->mlock/1){+.+.},
> at:genpd_lock_nested_mtx+0x24/0x30
> [ 5.367584]
> [ 5.367584] stack backtrace:
> [ 5.371939] CPU: 4 PID: 51 Comm: kworker/4:1 Tainted: G S
> 5.2.0-rc2-next-20190528-44527-g6c94b6475c04 #20
> [ 5.382809] Workqueue: pm genpd_power_off_work_fn
> [ 5.382816] Call trace:
> [ 5.382822] dump_backtrace+0x0/0x2c0
> [ 5.382830] show_stack+0x20/0x2c
> [ 5.409174] dump_stack+0x10c/0x17c
> [ 5.412659] print_circular_bug+0x42c/0x4d0
> [ 5.416838] __lock_acquire+0x4c88/0x5484
> [ 5.420843] lock_acquire+0x350/0x4d4
> [ 5.424500] __mutex_lock_common+0x1a0/0x1fe8
> [ 5.428851] mutex_lock_nested+0x40/0x50
> [ 5.432770] regulator_lock_dependent+0xdc/0x6c4
> [ 5.437383] regulator_disable+0xa0/0x138
> [ 5.441389] scpsys_power_off+0x38c/0x4bc
> [ 5.445393] genpd_power_off+0x3d8/0x6a0
> [ 5.449310] genpd_power_off+0x530/0x6a0
> [ 5.453229] genpd_power_off_work_fn+0x74/0xc0
> [ 5.457667] process_one_work+0x858/0x1208
> [ 5.461758] worker_thread+0x9ec/0xcb8
> [ 5.465503] kthread+0x2b8/0x2d0
> [ 5.468727] ret_from_fork+0x10/0x18
>
> On Mon, Jun 10, 2019 at 8:21 PM Yong Wu <yong.wu@...iatek.com> wrote:
>> ...
>> + } else {
>> + res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
>> + common->base = devm_ioremap_resource(dev, res);
>> + if (IS_ERR(common->base))
>> + return PTR_ERR(common->base);
>> }
>> pm_runtime_enable(dev);
>> platform_set_drvdata(pdev, common);
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