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From: Robin Murphy <robin.murphy@arm.com>
To: Will Deacon <will@kernel.org>
Cc: bjorn.andersson@linaro.org, iommu@lists.linux-foundation.org,
	gregory.clement@bootlin.com,
	linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH 05/15] iommu/arm-smmu: Split arm_smmu_tlb_inv_range_nosync()
Date: Thu, 15 Aug 2019 12:22:29 +0100
Message-ID: <0f6362e2-38ac-0ad6-5da9-645f4695b6fd@arm.com> (raw)
In-Reply-To: <20190815105602.hk53orjumysfezff@willie-the-truck>

On 15/08/2019 11:56, Will Deacon wrote:
> On Fri, Aug 09, 2019 at 06:07:42PM +0100, Robin Murphy wrote:
>> Since we now use separate iommu_gather_ops for stage 1 and stage 2
>> contexts, we may as well divide up the monolithic callback into its
>> respective stage 1 and stage 2 parts.
>>
>> Signed-off-by: Robin Murphy <robin.murphy@arm.com>
>> ---
>>   drivers/iommu/arm-smmu.c | 66 ++++++++++++++++++++++------------------
>>   1 file changed, 37 insertions(+), 29 deletions(-)
> 
> This will conflict with my iommu API batching stuff, but I can sort that
> out if/when it gets queued by Joerg.
> 
>> -		if (cfg->fmt != ARM_SMMU_CTX_FMT_AARCH64) {
>> -			iova &= ~12UL;
>> -			iova |= cfg->asid;
>> -			do {
>> -				writel_relaxed(iova, reg);
>> -				iova += granule;
>> -			} while (size -= granule);
>> -		} else {
>> -			iova >>= 12;
>> -			iova |= (u64)cfg->asid << 48;
>> -			do {
>> -				writeq_relaxed(iova, reg);
>> -				iova += granule >> 12;
>> -			} while (size -= granule);
>> -		}
>> -	} else {
>> -		reg += leaf ? ARM_SMMU_CB_S2_TLBIIPAS2L :
>> -			      ARM_SMMU_CB_S2_TLBIIPAS2;
>> -		iova >>= 12;
>> +	if (cfg->fmt != ARM_SMMU_CTX_FMT_AARCH64) {
>> +		iova &= ~12UL;
> 
> Oh baby. You should move code around more often, so I'm forced to take a
> second look!

Oh dear lord... The worst part is that I do now remember seeing this and 
having a similar moment of disbelief, but apparently I was easily 
distracted with rebasing and forgot about it too quickly :(

> Can you cook a fix for this that we can route separately, please? I see
> it also made its way into qcom_iommu.c...

Sure, I'll split it out to the front of the series for the moment.

Robin.
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Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-09 17:07 [PATCH 00/15] Arm SMMU refactoring Robin Murphy
2019-08-09 17:07 ` [PATCH 01/15] iommu/arm-smmu: Convert GR0 registers to bitfields Robin Murphy
2019-08-14 17:20   ` Will Deacon
2019-08-14 17:35     ` Robin Murphy
2019-08-09 17:07 ` [PATCH 02/15] iommu/arm-smmu: Convert GR1 " Robin Murphy
2019-08-09 17:07 ` [PATCH 03/15] iommu/arm-smmu: Convert context bank " Robin Murphy
2019-08-09 17:07 ` [PATCH 04/15] iommu/arm-smmu: Rework cb_base handling Robin Murphy
2019-08-14 18:05   ` Will Deacon
2019-08-15 11:14     ` Robin Murphy
2019-08-09 17:07 ` [PATCH 05/15] iommu/arm-smmu: Split arm_smmu_tlb_inv_range_nosync() Robin Murphy
2019-08-15 10:56   ` Will Deacon
2019-08-15 11:22     ` Robin Murphy [this message]
2019-08-09 17:07 ` [PATCH 06/15] iommu/arm-smmu: Get rid of weird "atomic" write Robin Murphy
2019-08-09 17:07 ` [PATCH 07/15] iommu/arm-smmu: Abstract GR1 accesses Robin Murphy
2019-08-09 17:07 ` [PATCH 08/15] iommu/arm-smmu: Abstract context bank accesses Robin Murphy
2019-08-15 10:56   ` Will Deacon
2019-08-15 11:41     ` Robin Murphy
2019-08-09 17:07 ` [PATCH 09/15] iommu/arm-smmu: Abstract GR0 accesses Robin Murphy
2019-08-09 17:07 ` [PATCH 10/15] iommu/arm-smmu: Rename arm-smmu-regs.h Robin Murphy
2019-08-09 17:07 ` [PATCH 11/15] iommu/arm-smmu: Add implementation infrastructure Robin Murphy
2019-08-09 17:07 ` [PATCH 12/15] iommu/arm-smmu: Move Secure access quirk to implementation Robin Murphy
2019-08-09 17:07 ` [PATCH 13/15] iommu/arm-smmu: Add configuration implementation hook Robin Murphy
2019-08-09 17:07 ` [PATCH 14/15] iommu/arm-smmu: Add reset " Robin Murphy
2019-08-09 17:07 ` [PATCH 15/15] iommu/arm-smmu: Add context init " Robin Murphy
2019-08-13 19:11   ` Krishna Reddy
2019-08-15 10:56   ` Will Deacon
2019-08-15 12:09     ` Robin Murphy
2019-08-15 15:09       ` Jordan Crouse
2019-08-09 17:11 ` [PATCH 00/15] Arm SMMU refactoring Robin Murphy
2019-08-15 10:55 ` Will Deacon

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