lkml.org 
[lkml]   [2016]   [Apr]   [8]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    SubjectRe: [PATCH 0/7] PM / devfreq: Add NoCP devfreq-event and support busfreq on exyno5422-odroidxu3
    From
    Hi Anand,

    On Sat, Apr 9, 2016 at 3:11 AM, Anand Moon <linux.amoon@gmail.com> wrote:
    > Hi Chanwoo,
    >
    > On 8 April 2016 at 10:30, Chanwoo Choi <cw00.choi@samsung.com> wrote:
    >> This patchset support the AMBA bus frequency scaling on Exynos5422-based
    >> Odroid-XU3 board. But, this series only support the bus frequency scaling
    >> for INT (Internal) block using VDD_INT power line.
    >>
    >> Also, to support the bus frequency scaling for Exynos542x SoC,
    >> Exynos542x SoC has the specific 'NoC (Network on Chip) Probe' device
    >> to measure the transfered data traffic on NoC (Network on Chip)
    >> instead of PPMU (Platform Performance Monitoring Unit). NoC Probe device
    >> provide the utilization for INT block of Exynos542x SoC.
    >>
    >> The generic exynos-bus frequency driver uses the 'NoC Probe' devfreq-event
    >> device (drivers/devfreq/event/exynos-nocp.c) without any modification.
    >> Just add the phandle of 'NoC Probe' dt node to bus dt node.
    >>
    >> Depend on:
    >> This patchset depends on patch[1] which support the generic exynos-bus
    >> frequency driver.
    >>
    >> [1] https://lkml.org/lkml/2016/4/8/14
    >> - [PATCH v8 00/20] PM / devferq: Add generic exynos bus frequency driver and new passive governor
    >>
    >> Chanwoo Choi (7):
    >> PM / devfreq: event: Add new Exynos NoC probe driver
    >> PM / devfreq: exynos: Add the detailed correlation for Exynos5422 bus
    >> ARM: dts: Add NoC Probe dt node for Exynos542x SoC
    >> dt-bindings: clock: Add the clock id for ACLK clock of Exynos542x SoC
    >> clk: samsung: exynos542x: Add the clock id for ACLK
    >> ARM: dts: Add bus nodes using VDD_INT for Exynos542x SoC
    >> ARM: dts: Add support of Bus frequency using VDD_INT for exynos5422-odroidxu3
    >>
    >> .../bindings/devfreq/event/exynos-nocp.txt | 86 +++++
    >> .../devicetree/bindings/devfreq/exynos-bus.txt | 19 +
    >> arch/arm/boot/dts/exynos5420.dtsi | 407 +++++++++++++++++++++
    >> arch/arm/boot/dts/exynos5422-odroidxu3-common.dtsi | 99 +++++
    >> drivers/clk/samsung/clk-exynos5420.c | 85 +++--
    >> drivers/devfreq/event/Kconfig | 8 +
    >> drivers/devfreq/event/Makefile | 2 +
    >> drivers/devfreq/event/exynos-nocp.c | 247 +++++++++++++
    >> drivers/devfreq/event/exynos-nocp.h | 78 ++++
    >> include/dt-bindings/clock/exynos5420.h | 24 +-
    >> 10 files changed, 1024 insertions(+), 31 deletions(-)
    >> create mode 100644 Documentation/devicetree/bindings/devfreq/event/exynos-nocp.txt
    >> create mode 100644 drivers/devfreq/event/exynos-nocp.c
    >> create mode 100644 drivers/devfreq/event/exynos-nocp.h
    >>
    >> --
    >> 1.9.1
    >>
    >
    > I am observing following deadlock. Both on Odroid U3 and Odroid XU4.

    Thanks for your test. I'll test it again and fix it.

    Best Regards,
    Chanwoo Choi

    >
    > [ 7.718372] [ INFO: possible recursive locking detected ]
    > [ 7.723747] 4.6.0-rc2-xu4ml #4 Not tainted
    > [ 7.727817] ---------------------------------------------
    > [ 7.733190] kworker/u16:1/136 is trying to acquire lock:
    > [ 7.738476] (&devfreq->lock){+.+.+.}, at: [<c05be41c>]
    > update_devfreq_passive+0x2c/0x88
    > [ 7.746534]
    > [ 7.746534] but task is already holding lock:
    > [ 7.752339] (&devfreq->lock){+.+.+.}, at: [<c05bd838>]
    > devfreq_monitor+0x1c/0x78
    > [ 7.759791]
    > [ 7.759791] other info that might help us debug this:
    > [ 7.766291] Possible unsafe locking scenario:
    > [ 7.766291]
    > [ 7.766307] usb 5-1: new high-speed USB device number 2 using xhci-hcd
    > [ 7.778682] CPU0
    > [ 7.781107] ----
    > [ 7.783533] lock(&devfreq->lock);
    > [ 7.786999] lock(&devfreq->lock);
    > [ 7.790467]
    > [ 7.790467] *** DEADLOCK ***
    > [ 7.790467]
    > [ 7.796359] May be due to missing lock nesting notation
    > [ 7.796359]
    > [ 7.803120] 4 locks held by kworker/u16:1/136:
    > [ 7.807537] #0: ("%s"("devfreq_wq")){.+.+..}, at: [<c013b41c>]
    > process_one_work+0x13c/0x454
    > [ 7.816029] #1: ((&(&devfreq->work)->work)){+.+...}, at:
    > [<c013b41c>] process_one_work+0x13c/0x454
    > [ 7.825128] #2: (&devfreq->lock){+.+.+.}, at: [<c05bd838>]
    > devfreq_monitor+0x1c/0x78
    > [ 7.833013] #3: (&nh->srcu){......}, at: [<c014309c>]
    > __srcu_notifier_call_chain+0x54/0xe0
    > [ 7.841419]
    > [ 7.841419] stack backtrace:
    > [ 7.845758] CPU: 1 PID: 136 Comm: kworker/u16:1 Not tainted
    > 4.6.0-rc2-xu4ml #4
    > [ 7.852946] Hardware name: SAMSUNG EXYNOS (Flattened Device Tree)
    > [ 7.859017] Workqueue: devfreq_wq devfreq_monitor
    > [ 7.863717] [<c010eb48>] (unwind_backtrace) from [<c010b884>]
    > (show_stack+0x10/0x14)
    > [ 7.871417] [<c010b884>] (show_stack) from [<c037715c>]
    > (dump_stack+0xa4/0xd0)
    > [ 7.878613] [<c037715c>] (dump_stack) from [<c017112c>]
    > (__lock_acquire+0x1ce8/0x207c)
    > [ 7.886492] [<c017112c>] (__lock_acquire) from [<c0172010>]
    > (lock_acquire+0x90/0xd4)
    > [ 7.892726] usb 5-1: New USB device found, idVendor=0bda, idProduct=8153
    > [ 7.892737] usb 5-1: New USB device strings: Mfr=1, Product=2, SerialNumber=6
    > [ 7.892745] usb 5-1: Product: USB 10/100/1000 LAN
    > [ 7.892753] usb 5-1: Manufacturer: Realtek
    > [ 7.892761] usb 5-1: SerialNumber: 000001000000
    > [ 7.921248] [<c0172010>] (lock_acquire) from [<c075d298>]
    > (mutex_lock_nested+0x78/0x4ec)
    > [ 7.929301] [<c075d298>] (mutex_lock_nested) from [<c05be41c>]
    > (update_devfreq_passive+0x2c/0x88)
    > [ 7.938138] [<c05be41c>] (update_devfreq_passive) from [<c05be4c0>]
    > (devfreq_passive_notifier_call+0x48/0x50)
    > [ 7.948016] [<c05be4c0>] (devfreq_passive_notifier_call) from
    > [<c0142d84>] (notifier_call_chain+0x54/0xa4)
    > [ 7.957633] [<c0142d84>] (notifier_call_chain) from [<c01430e0>]
    > (__srcu_notifier_call_chain+0x98/0xe0)
    > [ 7.966991] [<c01430e0>] (__srcu_notifier_call_chain) from
    > [<c0143140>] (srcu_notifier_call_chain+0x18/0x20)
    > [ 7.976783] [<c0143140>] (srcu_notifier_call_chain) from
    > [<c05bd774>] (update_devfreq+0xe4/0x18c)
    > [ 7.985622] [<c05bd774>] (update_devfreq) from [<c05bd840>]
    > (devfreq_monitor+0x24/0x78)
    > [ 7.993595] [<c05bd840>] (devfreq_monitor) from [<c013b48c>]
    > (process_one_work+0x1ac/0x454)
    > [ 8.001913] [<c013b48c>] (process_one_work) from [<c013b784>]
    > (worker_thread+0x50/0x508)
    > [ 8.009976] [<c013b784>] (worker_thread) from [<c0141cf4>]
    > (kthread+0xf8/0x110)
    > [ 8.017254] [<c0141cf4>] (kthread) from [<c0107750>]
    > (ret_from_fork+0x14/0x24)
    >
    > Best Regards
    > -Anand Moon
    > --
    > To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in
    > the body of a message to majordomo@vger.kernel.org
    > More majordomo info at http://vger.kernel.org/majordomo-info.html

    \
     
     \ /
      Last update: 2016-04-08 20:41    [W:4.293 / U:0.188 seconds]
    ©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site