From: Vivek Gautam <vivek.gautam@codeaurora.org>
To: Sricharan R <sricharan@codeaurora.org>,
Stephen Boyd <sboyd@codeaurora.org>,
robin.murphy@arm.com, Rob Clark <robdclark@gmail.com>
Cc: joro@8bytes.org, "robh+dt" <robh+dt@kernel.org>,
Mark Rutland <mark.rutland@arm.com>,
Will Deacon <will.deacon@arm.com>,
Marek Szyprowski <m.szyprowski@samsung.com>,
iommu@lists.linux-foundation.org,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
linux-clk@vger.kernel.org, linux-arm-msm@vger.kernel.org,
Stanimir Varbanov <stanimir.varbanov@linaro.org>,
architt@codeaurora.org,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>
Subject: Re: [PATCH V4 3/6] iommu/arm-smmu: Invoke pm_runtime during probe, add/remove device
Date: Thu, 13 Jul 2017 19:31:41 +0530 [thread overview]
Message-ID: <CAFp+6iGr_WwhDTygc3Z7pmRJe704PAo_T_XLYvu-=f01cmnumA@mail.gmail.com> (raw)
In-Reply-To: <CAFp+6iFdogDfKbwWta3AMGu2GuZ9NaR+Dv373N7LwwrF5cFYwQ@mail.gmail.com>
On Thu, Jul 13, 2017 at 7:27 PM, Vivek Gautam
<vivek.gautam@codeaurora.org> wrote:
> On Thu, Jul 13, 2017 at 11:05 AM, Sricharan R <sricharan@codeaurora.org> wrote:
>> Hi Vivek,
>>
>> On 7/13/2017 10:43 AM, Vivek Gautam wrote:
>>> Hi Stephen,
>>>
>>>
>>> On 07/13/2017 04:24 AM, Stephen Boyd wrote:
>>>> On 07/06, Vivek Gautam wrote:
>>>>> @@ -1231,12 +1237,18 @@ static int arm_smmu_map(struct iommu_domain *domain, unsigned long iova,
>>>>> static size_t arm_smmu_unmap(struct iommu_domain *domain, unsigned long iova,
>>>>> size_t size)
>>>>> {
>>>>> - struct io_pgtable_ops *ops = to_smmu_domain(domain)->pgtbl_ops;
>>>>> + struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
>>>>> + struct io_pgtable_ops *ops = smmu_domain->pgtbl_ops;
>>>>> + size_t ret;
>>>>> if (!ops)
>>>>> return 0;
>>>>> - return ops->unmap(ops, iova, size);
>>>>> + pm_runtime_get_sync(smmu_domain->smmu->dev);
>>>> Can these map/unmap ops be called from an atomic context? I seem
>>>> to recall that being a problem before.
>>>
>>> That's something which was dropped in the following patch merged in master:
>>> 523d7423e21b iommu/arm-smmu: Remove io-pgtable spinlock
>>>
>>> Looks like we don't need locks here anymore?
>>
>> Apart from the locking, wonder why a explicit pm_runtime is needed
>> from unmap. Somehow looks like some path in the master using that
>> should have enabled the pm ?
>
> Right, the master should have done a runtime_get(), and with
> device links the iommu will also resume.
>
> The master will call the unmap when it is attached to the iommu
> and therefore the iommu should be in resume state.
> We shouldn't have an unmap without the master attached anyways.
> Will investigate this further if we need the pm_runtime() calls
> around unmap or not.
My apologies. My email client didn't update the thread. So please ignore
this comment.
>
> Best regards
> Vivek
>
>>
>> Regards,
>> Sricharan
>>
>> --
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>
>
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next prev parent reply other threads:[~2017-07-13 14:01 UTC|newest]
Thread overview: 53+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-06 9:36 [PATCH V4 0/6] iommu/arm-smmu: Add runtime pm/sleep support Vivek Gautam
2017-07-06 9:37 ` [PATCH V4 1/6] iommu/arm-smmu: Fix the error path in arm_smmu_add_device Vivek Gautam
2017-07-06 9:37 ` [PATCH V4 2/6] iommu/arm-smmu: Add pm_runtime/sleep ops Vivek Gautam
2017-07-12 22:58 ` Stephen Boyd
2017-07-12 23:01 ` Stephen Boyd
2017-07-13 3:57 ` Vivek Gautam
2017-07-06 9:37 ` [PATCH V4 3/6] iommu/arm-smmu: Invoke pm_runtime during probe, add/remove device Vivek Gautam
2017-07-12 22:54 ` Stephen Boyd
2017-07-13 5:13 ` Vivek Gautam
2017-07-13 5:35 ` Sricharan R
2017-07-13 11:50 ` Rob Clark
2017-07-13 12:02 ` Marek Szyprowski
2017-07-13 12:10 ` Rob Clark
2017-07-13 12:23 ` Marek Szyprowski
2017-07-13 13:53 ` Sricharan R
2017-07-13 14:55 ` Rob Clark
2017-07-14 17:07 ` Will Deacon
2017-07-14 17:42 ` Rob Clark
2017-07-14 18:06 ` Will Deacon
2017-07-14 18:25 ` Rob Clark
2017-07-14 19:01 ` Will Deacon
2017-07-14 19:34 ` Rob Clark
2017-07-14 19:36 ` Will Deacon
2017-07-14 19:39 ` Rob Clark
2017-07-17 11:46 ` Sricharan R
2017-07-17 12:28 ` Sricharan R
2017-07-24 15:31 ` Vivek Gautam
2017-08-02 9:53 ` [PATCH] iommu/arm-smmu: Defer TLB flush in case of unmap op Vivek Gautam
2017-08-02 12:17 ` Robin Murphy
2017-08-03 5:35 ` Vivek Gautam
2017-08-04 17:04 ` Robin Murphy
2017-08-07 7:44 ` Vivek Gautam
2017-08-07 8:27 ` [PATCH V4 3/6] iommu/arm-smmu: Invoke pm_runtime during probe, add/remove device Vivek Gautam
2017-08-07 12:29 ` Rob Clark
2017-11-14 18:30 ` Vivek Gautam
2017-11-27 22:22 ` Stephen Boyd
2017-11-27 23:43 ` Rob Clark
2017-11-28 13:43 ` Vivek Gautam
2017-11-28 20:05 ` Rob Clark
2017-07-13 13:57 ` Vivek Gautam
2017-07-13 14:01 ` Vivek Gautam [this message]
2017-07-13 6:48 ` Stephen Boyd
2017-07-13 9:50 ` Robin Murphy
2017-07-13 11:53 ` Rob Clark
2017-07-06 9:37 ` [PATCH V4 4/6] iommu/arm-smmu: Add the device_link between masters and smmu Vivek Gautam
2017-07-12 22:55 ` Stephen Boyd
2017-07-13 3:59 ` Vivek Gautam
2017-07-06 9:37 ` [PATCH V4 5/6] iommu/arm-smmu: Add support for MMU40x/500 clocks Vivek Gautam
2017-07-10 3:37 ` Rob Herring
2017-07-11 5:18 ` Vivek Gautam
2017-07-06 9:37 ` [PATCH V4 6/6] iommu/arm-smmu: Add support for qcom,msm8996-smmu-v2 clocks Vivek Gautam
2017-07-10 3:40 ` Rob Herring
2017-07-10 6:42 ` Vivek Gautam
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