IOMMU Archive on lore.kernel.org
 help / color / Atom feed
From: Pi-Hsun Shih <pihsun@chromium.org>
To: Yong Wu <yong.wu@mediatek.com>
Cc: youlin.pei@mediatek.com,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
	<devicetree@vger.kernel.org>,
	Nicolas Boichat <drinkcat@chromium.org>,
	srv_heupstream@mediatek.com, Will Deacon <will.deacon@arm.com>,
	open list <linux-kernel@vger.kernel.org>,
	Evan Green <evgreen@chromium.org>, Tomasz Figa <tfiga@google.com>,
	iommu@lists.linux-foundation.org,
	Rob Herring <robh+dt@kernel.org>,
	"moderated list:ARM/Mediatek SoC support"
	<linux-mediatek@lists.infradead.org>,
	Matthias Brugger <matthias.bgg@gmail.com>,
	yingjoe.chen@mediatek.com, anan.sun@mediatek.com,
	Robin Murphy <robin.murphy@arm.com>,
	Matthias Kaehlcke <mka@chromium.org>,
	"moderated list:ARM/Mediatek SoC support"
	<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH v7 16/21] memory: mtk-smi: Add bus_sel for mt8183
Date: Thu, 13 Jun 2019 16:20:03 +0800
Message-ID: <CANdKZ0emRPcTcL7Yq5nLH5z2_9fBuuczKehA8oEi0b+je15RPg@mail.gmail.com> (raw)
In-Reply-To: <1560169080-27134-17-git-send-email-yong.wu@mediatek.com>

(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
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@mediatek.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);
_______________________________________________
iommu mailing list
iommu@lists.linux-foundation.org
https://lists.linuxfoundation.org/mailman/listinfo/iommu

  parent reply index

Thread overview: 53+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-06-10 12:17 [PATCH v7 00/21] MT8183 IOMMU SUPPORT Yong Wu
2019-06-10 12:17 ` [PATCH v7 01/21] dt-bindings: mediatek: Add binding for mt8183 IOMMU and SMI Yong Wu
2019-06-10 12:17 ` [PATCH v7 02/21] iommu/mediatek: Use a struct as the platform data Yong Wu
2019-06-10 12:17 ` [PATCH v7 03/21] memory: mtk-smi: Use a general config_port interface Yong Wu
2019-06-10 12:17 ` [PATCH v7 04/21] memory: mtk-smi: Use a struct for the platform data for smi-common Yong Wu
2019-06-10 12:17 ` [PATCH v7 05/21] iommu/io-pgtable-arm-v7s: Add paddr_to_iopte and iopte_to_paddr helpers Yong Wu
2019-06-10 12:17 ` [PATCH v7 06/21] iommu/io-pgtable-arm-v7s: Extend MediaTek 4GB Mode Yong Wu
2019-06-10 12:17 ` [PATCH v7 07/21] iommu/mediatek: Add bclk can be supported optionally Yong Wu
2019-06-15 19:18   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 08/21] iommu/mediatek: Add larb-id remapped support Yong Wu
2019-06-17  9:25   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 09/21] iommu/mediatek: Refine protect memory definition Yong Wu
2019-06-17  9:59   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 10/21] iommu/mediatek: Move reset_axi into plat_data Yong Wu
2019-06-17 10:19   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 11/21] iommu/mediatek: Move vld_pa_rng " Yong Wu
2019-06-17 10:27   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 12/21] memory: mtk-smi: Add gals support Yong Wu
2019-06-17 15:43   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 13/21] iommu/mediatek: Add mt8183 IOMMU support Yong Wu
2019-06-17 15:51   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 14/21] iommu/mediatek: Add mmu1 support Yong Wu
2019-06-17 15:58   ` Matthias Brugger
2019-06-18  6:19   ` Tomasz Figa via iommu
2019-06-18 12:09     ` Yong Wu
2019-06-18 14:05       ` Tomasz Figa via iommu
2019-06-10 12:17 ` [PATCH v7 15/21] memory: mtk-smi: Invoke pm runtime_callback to enable clocks Yong Wu
2019-06-17 16:13   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 16/21] memory: mtk-smi: Add bus_sel for mt8183 Yong Wu
2019-06-13  8:14   ` Pi-Hsun Shih
2019-06-20  9:35     ` Matthias Brugger
2019-06-20 11:38       ` Matthias Brugger
2019-06-21  3:57         ` Pi-Hsun Shih
2019-06-13  8:20   ` Pi-Hsun Shih [this message]
2019-06-17 16:28     ` Matthias Brugger
2019-06-17 16:23   ` Matthias Brugger
2019-06-18 12:10     ` Yong Wu
2019-06-18 21:07       ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 17/21] memory: mtk-smi: Get rid of need_larbid Yong Wu
2019-06-18 13:45   ` Matthias Brugger
2019-06-20 13:59     ` Yong Wu
2019-06-10 12:17 ` [PATCH v7 18/21] iommu/mediatek: Fix VLD_PA_RNG register backup when suspend Yong Wu
2019-06-17 16:30   ` Matthias Brugger
2019-06-10 12:17 ` [PATCH v7 19/21] iommu/mediatek: Rename enable_4GB to dram_is_4gb Yong Wu
2019-06-18 16:06   ` Matthias Brugger
2019-06-20 13:59     ` Yong Wu
2019-06-21 10:10       ` Matthias Brugger
2019-06-22  2:42         ` Yong Wu
2019-06-10 12:17 ` [PATCH v7 20/21] iommu/mediatek: Fix iova_to_phys PA start for 4GB mode Yong Wu
2019-06-18 16:35   ` Matthias Brugger
2019-06-20 14:00     ` Yong Wu
2019-06-10 12:18 ` [PATCH v7 21/21] iommu/mediatek: Switch to SPDX license identifier Yong Wu
2019-06-17 16:33   ` Matthias Brugger

Reply instructions:

You may reply publically to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=CANdKZ0emRPcTcL7Yq5nLH5z2_9fBuuczKehA8oEi0b+je15RPg@mail.gmail.com \
    --to=pihsun@chromium.org \
    --cc=anan.sun@mediatek.com \
    --cc=devicetree@vger.kernel.org \
    --cc=drinkcat@chromium.org \
    --cc=evgreen@chromium.org \
    --cc=iommu@lists.linux-foundation.org \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-mediatek@lists.infradead.org \
    --cc=matthias.bgg@gmail.com \
    --cc=mka@chromium.org \
    --cc=robh+dt@kernel.org \
    --cc=robin.murphy@arm.com \
    --cc=srv_heupstream@mediatek.com \
    --cc=tfiga@google.com \
    --cc=will.deacon@arm.com \
    --cc=yingjoe.chen@mediatek.com \
    --cc=yong.wu@mediatek.com \
    --cc=youlin.pei@mediatek.com \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

IOMMU Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-iommu/0 linux-iommu/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-iommu linux-iommu/ https://lore.kernel.org/linux-iommu \
		iommu@lists.linux-foundation.org
	public-inbox-index linux-iommu

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.linux-foundation.lists.iommu


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git