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From: Robin Murphy <robin.murphy-5wv7dgnIgG8@public.gmane.org>
To: Vivek Gautam
	<vivek.gautam-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>,
	Will Deacon <will.deacon-5wv7dgnIgG8@public.gmane.org>
Cc: Mark Rutland <mark.rutland-5wv7dgnIgG8@public.gmane.org>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS"
	<devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Linux PM <linux-pm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	sboyd-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org,
	linux-arm-msm
	<linux-arm-msm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Joerg Roedel <joro-zLv9SwRftAIdnm+yROfE0A@public.gmane.org>,
	"Rafael J. Wysocki" <rjw-LthD3rsA81gm4RdzfppkhA@public.gmane.org>,
	open list <linux-kernel-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	iommu-cunTk1MwBs9QetFLy7KEm3xJsTq8ys+cHZ5vskTnxNA@public.gmane.org,
	Tomasz Figa <tfiga-F7+t8E8rja9g9hUCZPvPmw@public.gmane.org>,
	alex.williamson-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org,
	robh+dt <robh+dt-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>,
	freedreno
	<freedreno-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org>
Subject: Re: [PATCH v16 2/5] iommu/arm-smmu: Invoke pm_runtime during probe, add/remove device
Date: Tue, 25 Sep 2018 19:55:33 +0100	[thread overview]
Message-ID: <aedf3f32-68ae-566a-3735-ca4ec5c7559a@arm.com> (raw)
In-Reply-To: <CAFp+6iFvhdSq7upbvsEWgMewhAaaRM91iw9p7qOFPYrUxis0Hg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>

Hi Vivek,

On 2018-09-25 6:56 AM, Vivek Gautam wrote:
> Hi Robin, Will,
> 
> On Tue, Sep 18, 2018 at 8:41 AM Vivek Gautam
> <vivek.gautam@codeaurora.org> wrote:
>>
>> Hi Robin,
>>
>> On Fri, Sep 7, 2018 at 3:52 PM Vivek Gautam <vivek.gautam@codeaurora.org> wrote:
>>>
>>> On Fri, Sep 7, 2018 at 3:22 PM Tomasz Figa <tfiga@chromium.org> wrote:
>>>>
>>>> On Fri, Sep 7, 2018 at 6:38 PM Vivek Gautam <vivek.gautam@codeaurora.org> wrote:
>>>>>
>>>>> Hi Tomasz,
>>>>>
>>>>>
>>>>> On 9/7/2018 2:46 PM, Tomasz Figa wrote:
>>>>>> Hi Vivek,
>>>>>>
>>>>>> On Thu, Aug 30, 2018 at 11:46 PM Vivek Gautam
>>>>>> <vivek.gautam@codeaurora.org> wrote:
>>>>>>> From: Sricharan R <sricharan@codeaurora.org>
>>>>>>>
>>>>>>> The smmu device probe/remove and add/remove master device callbacks
>>>>>>> gets called when the smmu is not linked to its master, that is without
>>>>>>> the context of the master device. So calling runtime apis in those places
>>>>>>> separately.
>>>>>>> Global locks are also initialized before enabling runtime pm as the
>>>>>>> runtime_resume() calls device_reset() which does tlb_sync_global()
>>>>>>> that ultimately requires locks to be initialized.
>>>>>>>
>>>>>>> Signed-off-by: Sricharan R <sricharan@codeaurora.org>
>>>>>>> [vivek: Cleanup pm runtime calls]
>>>>>>> Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>
>>>>>>> Reviewed-by: Tomasz Figa <tfiga@chromium.org>
>>>>>>> Tested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
>>>>>>> ---
>>>>>>>    drivers/iommu/arm-smmu.c | 89 +++++++++++++++++++++++++++++++++++++++++++-----
>>>>>>>    1 file changed, 81 insertions(+), 8 deletions(-)
>>>>>> [snip]
>>>>>>> @@ -2215,10 +2281,17 @@ static int arm_smmu_device_remove(struct platform_device *pdev)
>>>>>>>           if (!bitmap_empty(smmu->context_map, ARM_SMMU_MAX_CBS))
>>>>>>>                   dev_err(&pdev->dev, "removing device with active domains!\n");
>>>>>>>
>>>>>>> +       arm_smmu_rpm_get(smmu);
>>>>>>>           /* Turn the thing off */
>>>>>>>           writel(sCR0_CLIENTPD, ARM_SMMU_GR0_NS(smmu) + ARM_SMMU_GR0_sCR0);
>>>>>>> +       arm_smmu_rpm_put(smmu);
>>>>>>> +
>>>>>>> +       if (pm_runtime_enabled(smmu->dev))
>>>>>>> +               pm_runtime_force_suspend(smmu->dev);
>>>>>>> +       else
>>>>>>> +               clk_bulk_disable(smmu->num_clks, smmu->clks);
>>>>>>>
>>>>>>> -       clk_bulk_disable_unprepare(smmu->num_clks, smmu->clks);
>>>>>>> +       clk_bulk_unprepare(smmu->num_clks, smmu->clks);
>>>>>> Aren't we missing pm_runtime_disable() here? We'll have the enable
>>>>>> count unbalanced if the driver is removed and probed again.
>>>>>
>>>>> pm_runtime_force_suspend() does a pm_runtime_disable() also if i am not
>>>>> wrong.
>>>>> And, as mentioned in a previous thread [1], we were seeing a warning
>>>>> which we avoided
>>>>> by keeping force_suspend().
>>>>>
>>>>> [1] https://lkml.org/lkml/2018/7/8/124
>>>>
>>>> I see, thanks. I didn't realize that pm_runtime_force_suspend()
>>>> already disables runtime PM indeed. Sorry for the noise.
>>>
>>> Hi Tomasz,
>>> No problem. Thanks for looking back at it.
>>>
>>> Hi Robin,
>>> If you are fine with this series, then can you please consider giving
>>> Reviewed-by, so that we are certain that this series will go in the next merge
>>> window.
>>> Thanks
>>
>> Gentle ping.
>> You ack will be very helpful in letting Will pull this series for 4.20.
>> Thanks.
> 
> I would really appreciate if you could provide your ack for this series.
> Or if there are any concerns, I am willing to address them.

Apologies, I thought I'd replied to say I'd be getting to this shortly, 
but apparently not :(

FWIW, "shortly" is now tomorrow - I don't *think* there's anything 
outstanding, but given the number of subtleties we've turned up so far I 
do just want one last thorough double-check to make sure.

Thanks,
Robin.
_______________________________________________
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Freedreno@lists.freedesktop.org
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WARNING: multiple messages have this Message-ID
From: Robin Murphy <robin.murphy@arm.com>
To: Vivek Gautam <vivek.gautam@codeaurora.org>,
	Will Deacon <will.deacon@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
	"open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
	<devicetree@vger.kernel.org>,
	alex.williamson@redhat.com, Linux PM <linux-pm@vger.kernel.org>,
	sboyd@kernel.org, "Rafael J. Wysocki" <rjw@rjwysocki.net>,
	open list <linux-kernel@vger.kernel.org>,
	"list@263.net:IOMMU DRIVERS" <iommu@lists.linux-foundation.org>,
	Joerg Roedel <joro@8bytes.org>,
	iommu@lists.linux-foundation.org, robh+dt <robh+dt@kernel.org>,
	linux-arm-msm <linux-arm-msm@vger.kernel.org>,
	freedreno <freedreno@lists.freedesktop.org>,
	Tomasz Figa <tfiga@chromium.org>
Subject: Re: [PATCH v16 2/5] iommu/arm-smmu: Invoke pm_runtime during probe, add/remove device
Date: Tue, 25 Sep 2018 19:55:33 +0100	[thread overview]
Message-ID: <aedf3f32-68ae-566a-3735-ca4ec5c7559a@arm.com> (raw)
In-Reply-To: <CAFp+6iFvhdSq7upbvsEWgMewhAaaRM91iw9p7qOFPYrUxis0Hg@mail.gmail.com>

Hi Vivek,

On 2018-09-25 6:56 AM, Vivek Gautam wrote:
> Hi Robin, Will,
> 
> On Tue, Sep 18, 2018 at 8:41 AM Vivek Gautam
> <vivek.gautam@codeaurora.org> wrote:
>>
>> Hi Robin,
>>
>> On Fri, Sep 7, 2018 at 3:52 PM Vivek Gautam <vivek.gautam@codeaurora.org> wrote:
>>>
>>> On Fri, Sep 7, 2018 at 3:22 PM Tomasz Figa <tfiga@chromium.org> wrote:
>>>>
>>>> On Fri, Sep 7, 2018 at 6:38 PM Vivek Gautam <vivek.gautam@codeaurora.org> wrote:
>>>>>
>>>>> Hi Tomasz,
>>>>>
>>>>>
>>>>> On 9/7/2018 2:46 PM, Tomasz Figa wrote:
>>>>>> Hi Vivek,
>>>>>>
>>>>>> On Thu, Aug 30, 2018 at 11:46 PM Vivek Gautam
>>>>>> <vivek.gautam@codeaurora.org> wrote:
>>>>>>> From: Sricharan R <sricharan@codeaurora.org>
>>>>>>>
>>>>>>> The smmu device probe/remove and add/remove master device callbacks
>>>>>>> gets called when the smmu is not linked to its master, that is without
>>>>>>> the context of the master device. So calling runtime apis in those places
>>>>>>> separately.
>>>>>>> Global locks are also initialized before enabling runtime pm as the
>>>>>>> runtime_resume() calls device_reset() which does tlb_sync_global()
>>>>>>> that ultimately requires locks to be initialized.
>>>>>>>
>>>>>>> Signed-off-by: Sricharan R <sricharan@codeaurora.org>
>>>>>>> [vivek: Cleanup pm runtime calls]
>>>>>>> Signed-off-by: Vivek Gautam <vivek.gautam@codeaurora.org>
>>>>>>> Reviewed-by: Tomasz Figa <tfiga@chromium.org>
>>>>>>> Tested-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
>>>>>>> ---
>>>>>>>    drivers/iommu/arm-smmu.c | 89 +++++++++++++++++++++++++++++++++++++++++++-----
>>>>>>>    1 file changed, 81 insertions(+), 8 deletions(-)
>>>>>> [snip]
>>>>>>> @@ -2215,10 +2281,17 @@ static int arm_smmu_device_remove(struct platform_device *pdev)
>>>>>>>           if (!bitmap_empty(smmu->context_map, ARM_SMMU_MAX_CBS))
>>>>>>>                   dev_err(&pdev->dev, "removing device with active domains!\n");
>>>>>>>
>>>>>>> +       arm_smmu_rpm_get(smmu);
>>>>>>>           /* Turn the thing off */
>>>>>>>           writel(sCR0_CLIENTPD, ARM_SMMU_GR0_NS(smmu) + ARM_SMMU_GR0_sCR0);
>>>>>>> +       arm_smmu_rpm_put(smmu);
>>>>>>> +
>>>>>>> +       if (pm_runtime_enabled(smmu->dev))
>>>>>>> +               pm_runtime_force_suspend(smmu->dev);
>>>>>>> +       else
>>>>>>> +               clk_bulk_disable(smmu->num_clks, smmu->clks);
>>>>>>>
>>>>>>> -       clk_bulk_disable_unprepare(smmu->num_clks, smmu->clks);
>>>>>>> +       clk_bulk_unprepare(smmu->num_clks, smmu->clks);
>>>>>> Aren't we missing pm_runtime_disable() here? We'll have the enable
>>>>>> count unbalanced if the driver is removed and probed again.
>>>>>
>>>>> pm_runtime_force_suspend() does a pm_runtime_disable() also if i am not
>>>>> wrong.
>>>>> And, as mentioned in a previous thread [1], we were seeing a warning
>>>>> which we avoided
>>>>> by keeping force_suspend().
>>>>>
>>>>> [1] https://lkml.org/lkml/2018/7/8/124
>>>>
>>>> I see, thanks. I didn't realize that pm_runtime_force_suspend()
>>>> already disables runtime PM indeed. Sorry for the noise.
>>>
>>> Hi Tomasz,
>>> No problem. Thanks for looking back at it.
>>>
>>> Hi Robin,
>>> If you are fine with this series, then can you please consider giving
>>> Reviewed-by, so that we are certain that this series will go in the next merge
>>> window.
>>> Thanks
>>
>> Gentle ping.
>> You ack will be very helpful in letting Will pull this series for 4.20.
>> Thanks.
> 
> I would really appreciate if you could provide your ack for this series.
> Or if there are any concerns, I am willing to address them.

Apologies, I thought I'd replied to say I'd be getting to this shortly, 
but apparently not :(

FWIW, "shortly" is now tomorrow - I don't *think* there's anything 
outstanding, but given the number of subtleties we've turned up so far I 
do just want one last thorough double-check to make sure.

Thanks,
Robin.

  parent reply	other threads:[~2018-09-25 18:55 UTC|newest]

Thread overview: 77+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-08-30 14:45 [PATCH v16 0/5] iommu/arm-smmu: Add runtime pm/sleep support Vivek Gautam
2018-08-30 14:45 ` Vivek Gautam
     [not found] ` <20180830144541.17740-1-vivek.gautam-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2018-08-30 14:45   ` [PATCH v16 1/5] iommu/arm-smmu: Add pm_runtime/sleep ops Vivek Gautam
2018-08-30 14:45     ` Vivek Gautam
     [not found]     ` <20180830144541.17740-2-vivek.gautam-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2018-09-26 15:27       ` Robin Murphy
2018-09-26 15:27         ` Robin Murphy
     [not found]         ` <1a918f99-83b0-2f51-7634-126639a220de-5wv7dgnIgG8@public.gmane.org>
2018-09-27  8:31           ` Vivek Gautam
2018-09-27  8:31             ` Vivek Gautam
2018-09-28 11:59     ` Ulf Hansson
2018-10-01  5:49       ` Vivek Gautam
2018-10-01  5:49         ` Vivek Gautam
     [not found]         ` <CAFp+6iHZysBmMZj+pZghPocEwDzU7KfR1gLQAQRBui+-gdiSTQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-10-01  9:38           ` Ulf Hansson
2018-10-01  9:38             ` Ulf Hansson
     [not found]             ` <CAPDyKFrCWaeDLbmbrRb23V_mRk8doBjM3u2X9tm0XNXm=-n5vA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-10-01 10:21               ` Vivek Gautam
2018-10-01 10:21                 ` Vivek Gautam
2018-10-01 10:32           ` Vivek Gautam
2018-10-01 10:32             ` Vivek Gautam
     [not found]             ` <CAFp+6iFJbQZ1MrNWD6g+GNp9TOMXuq0oDdzQ9XUMTmY67tNgWg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-10-01 12:02               ` Ulf Hansson
2018-10-01 12:02                 ` Ulf Hansson
2018-08-30 14:45   ` [PATCH v16 2/5] iommu/arm-smmu: Invoke pm_runtime during probe, add/remove device Vivek Gautam
2018-08-30 14:45     ` Vivek Gautam
     [not found]     ` <20180830144541.17740-3-vivek.gautam-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2018-09-07  9:16       ` Tomasz Figa
2018-09-07  9:16         ` Tomasz Figa
     [not found]         ` <CAAFQd5B7YR03Jm1upOg2nsaKOb1iDD7-WGo-qx7S8m-nounCvA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-09-07  9:38           ` Vivek Gautam
2018-09-07  9:38             ` Vivek Gautam
2018-09-07  9:52             ` Tomasz Figa
2018-09-07  9:52               ` Tomasz Figa
     [not found]               ` <CAAFQd5DMDWEeBU=fg6arye3pXnrCqOA4tDtMSGutXk7vSz-EtQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-09-07 10:22                 ` Vivek Gautam
2018-09-07 10:22                   ` Vivek Gautam
     [not found]                   ` <CAFp+6iE3+qn6-gpXEzxfoP5yPMARmUcJNn0AZk-kA2AreTLnng-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-09-18  3:11                     ` Vivek Gautam
2018-09-18  3:11                       ` Vivek Gautam
     [not found]                       ` <CAFp+6iHnHj_PkPFBUSTdJTW57K51wLqSEw6VOMKxAVo7O+ms9g-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-09-25  5:56                         ` Vivek Gautam
2018-09-25  5:56                           ` Vivek Gautam
     [not found]                           ` <CAFp+6iFvhdSq7upbvsEWgMewhAaaRM91iw9p7qOFPYrUxis0Hg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-09-25 18:55                             ` Robin Murphy [this message]
2018-09-25 18:55                               ` Robin Murphy
     [not found]                               ` <aedf3f32-68ae-566a-3735-ca4ec5c7559a-5wv7dgnIgG8@public.gmane.org>
2018-09-26  6:22                                 ` Vivek Gautam
2018-09-26  6:22                                   ` Vivek Gautam
2018-09-26 15:42       ` Robin Murphy
2018-09-26 15:42         ` Robin Murphy
2018-10-01 12:58       ` Will Deacon
2018-10-01 12:58         ` Will Deacon
     [not found]         ` <20181001125854.GB31488-5wv7dgnIgG8@public.gmane.org>
2018-10-02  4:14           ` Vivek Gautam
2018-10-02  4:14             ` Vivek Gautam
     [not found]             ` <CAFp+6iGkudBtZFfk4ST+k9OMRSGgU=pzVGC4QaSmPb+Xkdp3Xw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-10-02  5:28               ` Vivek Gautam
2018-10-02  5:28                 ` Vivek Gautam
     [not found]                 ` <CAFp+6iFpm05Uu8HkYCC+O+gYwFwvxirc6=e6oOed+ZJk6QLDPw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-10-02  7:12                   ` [PATCH v17 " Vivek Gautam
2018-10-02  7:12                     ` Vivek Gautam
2018-10-02  7:12                     ` Vivek Gautam
2018-08-30 14:45   ` [PATCH v16 3/5] iommu/arm-smmu: Add the device_link between masters and smmu Vivek Gautam
2018-08-30 14:45     ` Vivek Gautam
     [not found]     ` <20180830144541.17740-4-vivek.gautam-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2018-09-26 15:44       ` Robin Murphy
2018-09-26 15:44         ` Robin Murphy
2018-08-30 14:45   ` [PATCH v16 4/5] dt-bindings: arm-smmu: Add bindings for qcom, smmu-v2 Vivek Gautam
2018-08-30 14:45     ` [PATCH v16 4/5] dt-bindings: arm-smmu: Add bindings for qcom,smmu-v2 Vivek Gautam
     [not found]     ` <20180830144541.17740-5-vivek.gautam-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2018-09-06  3:52       ` [PATCH v16 4/5] dt-bindings: arm-smmu: Add bindings for qcom, smmu-v2 Vivek Gautam
2018-09-06  3:52         ` [PATCH v16 4/5] dt-bindings: arm-smmu: Add bindings for qcom,smmu-v2 Vivek Gautam
2018-09-10 18:02       ` Rob Herring
2018-09-10 18:02         ` Rob Herring
2018-09-11  8:34         ` [PATCH v16 4/5] dt-bindings: arm-smmu: Add bindings for qcom, smmu-v2 Vivek Gautam
2018-09-11  8:34           ` [PATCH v16 4/5] dt-bindings: arm-smmu: Add bindings for qcom,smmu-v2 Vivek Gautam
2018-09-26 15:46       ` [PATCH v16 4/5] dt-bindings: arm-smmu: Add bindings for qcom, smmu-v2 Robin Murphy
2018-09-26 15:46         ` [PATCH v16 4/5] dt-bindings: arm-smmu: Add bindings for qcom,smmu-v2 Robin Murphy
2018-10-01 12:18       ` [PATCH v16 4/5] dt-bindings: arm-smmu: Add bindings for qcom, smmu-v2 Will Deacon
2018-10-01 12:18         ` [PATCH v16 4/5] dt-bindings: arm-smmu: Add bindings for qcom,smmu-v2 Will Deacon
2018-10-01 17:36         ` Rob Herring
     [not found]           ` <CAL_Jsq+dSGXCiWsjLt00wu=s-ZW8M1pkQqKFWboc54M8gHFTYg-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2018-10-01 17:45             ` [PATCH v16 4/5] dt-bindings: arm-smmu: Add bindings for qcom, smmu-v2 Will Deacon
2018-10-01 17:45               ` [PATCH v16 4/5] dt-bindings: arm-smmu: Add bindings for qcom,smmu-v2 Will Deacon
2018-08-30 14:45   ` [PATCH v16 5/5] iommu/arm-smmu: Add support for qcom, smmu-v2 variant Vivek Gautam
2018-08-30 14:45     ` [PATCH v16 5/5] iommu/arm-smmu: Add support for qcom,smmu-v2 variant Vivek Gautam
     [not found]     ` <20180830144541.17740-6-vivek.gautam-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org>
2018-09-26 15:59       ` [PATCH v16 5/5] iommu/arm-smmu: Add support for qcom, smmu-v2 variant Robin Murphy
2018-09-26 15:59         ` [PATCH v16 5/5] iommu/arm-smmu: Add support for qcom,smmu-v2 variant Robin Murphy
2018-09-27  6:55         ` Vivek Gautam
2018-09-27  6:55           ` Vivek Gautam
2018-09-28 13:57   ` [PATCH v16 0/5] iommu/arm-smmu: Add runtime pm/sleep support Will Deacon
2018-09-28 13:57     ` Will Deacon
2018-10-01  9:06     ` Vivek Gautam
2018-10-01  9:06       ` Vivek Gautam

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