On Thu, Jul 13, 2017 at 5:50 AM, Robin Murphy <robin.murphy@xxxxxxx> wrote:
> On 13/07/17 07:48, Stephen Boyd wrote:
>> On 07/13, 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?
>>>
>>
>> While removing the spinlock around the map/unmap path may be one
>> thing, I'm not sure that's all of them. Is there a path from an
>> atomic DMA allocation (GFP_ATOMIC sort of thing) mapped into an
>> IOMMU for a device that can eventually get down to here and
>> attempt to turn a clk on?
>
> Yes, in the DMA path map/unmap will frequently be called from IRQ
> handlers (think e.g. network packets). The whole point of removing the
> lock was to allow multiple maps/unmaps to execute in parallel (since we
> know they will be safely operating on different areas of the pagetable).
> AFAICS this change is going to largely reintroduce that bottleneck via
> dev->power_lock, which is anything but what we want :(
>
Maybe __pm_runtime_resume() needs some sort of fast-path if already
enabled? Or otherwise we need some sort of flag to tell the iommu
that it cannot rely on the unmapping device to be resumed?
BR,
-R
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