linux-kernel - Re: [PATCH v6 4/6] iommu/arm-smmu-v3: Make __arm_smmu_cmdq_skip

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Message-ID: <ZjES3FTHWOl4Ycdq@Asurada-Nvidia>
Date: Tue, 30 Apr 2024 08:48:44 -0700
From: Nicolin Chen <nicolinc@...dia.com>
To: Jason Gunthorpe <jgg@...dia.com>
CC: <will@...nel.org>, <robin.murphy@....com>, <joro@...tes.org>,
	<thierry.reding@...il.com>, <vdumpa@...dia.com>, <jonathanh@...dia.com>,
	<linux-kernel@...r.kernel.org>, <iommu@...ts.linux.dev>,
	<linux-arm-kernel@...ts.infradead.org>, <linux-tegra@...r.kernel.org>
Subject: Re: [PATCH v6 4/6] iommu/arm-smmu-v3: Make __arm_smmu_cmdq_skip_err
 reusable

On Tue, Apr 30, 2024 at 11:06:00AM -0300, Jason Gunthorpe wrote:
> On Mon, Apr 29, 2024 at 09:43:47PM -0700, Nicolin Chen wrote:
> > Allow __arm_smmu_cmdq_skip_err function to be reused by NVIDIA Tegra241
> > CMDQV unit since it will use the same data structure for q. And include
> > the CMDQ_QUIRK_SYNC_CS_NONE_ONLY quirk when inserting a CMD_SYNC.
> > 
> > Signed-off-by: Nicolin Chen <nicolinc@...dia.com>
> > ---
> >  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 7 +++++--
> >  drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 2 ++
> >  2 files changed, 7 insertions(+), 2 deletions(-)
> > 
> > diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> > index 538850059bdd..5111859347d5 100644
> > --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> > +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c
> > @@ -379,8 +379,8 @@ static void arm_smmu_cmdq_build_sync_cmd(u64 *cmd, struct arm_smmu_device *smmu,
> >  	arm_smmu_cmdq_build_cmd(cmd, &ent);
> >  }
> >  
> > -static void __arm_smmu_cmdq_skip_err(struct arm_smmu_device *smmu,
> > -				     struct arm_smmu_queue *q)
> > +void __arm_smmu_cmdq_skip_err(struct arm_smmu_device *smmu,
> > +			      struct arm_smmu_queue *q)
> >  {
> >  	static const char * const cerror_str[] = {
> >  		[CMDQ_ERR_CERROR_NONE_IDX]	= "No error",
> > @@ -428,6 +428,9 @@ static void __arm_smmu_cmdq_skip_err(struct arm_smmu_device *smmu,
> >  	for (i = 0; i < ARRAY_SIZE(cmd); ++i)
> >  		dev_err(smmu->dev, "\t0x%016llx\n", (unsigned long long)cmd[i]);
> >  
> > +	if (q->quirks & CMDQ_QUIRK_SYNC_CS_NONE_ONLY)
> > +		cmd_sync.sync.cs_none = true;
> 
> This hunk should be in "iommu/arm-smmu-v3: Add CS_NONE quirk" ?

Oh, yea. Will move it.

Thanks!
Nicolin