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[104.188.17.28]) by smtp.gmail.com with ESMTPSA id n65sm11068363pfb.160.2019.04.18.17.24.59 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Thu, 18 Apr 2019 17:24:59 -0700 (PDT) Date: Thu, 18 Apr 2019 17:24:57 -0700 From: Bjorn Andersson To: Vivek Gautam Cc: joro@8bytes.org, will.deacon@arm.com, robin.murphy@arm.com, iommu@lists.linux-foundation.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org Subject: Re: [PATCH 1/1] iommu/arm-smmu: Log CBFRSYNRA register on context fault Message-ID: <20190419002457.GA3137@builder> References: <4cfc7b3b-bc74-6b37-19f5-40b6394fa762@codeaurora.org> <20190415173758.22112-1-vivek.gautam@codeaurora.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20190415173758.22112-1-vivek.gautam@codeaurora.org> User-Agent: Mutt/1.10.0 (2018-05-17) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon 15 Apr 10:37 PDT 2019, Vivek Gautam wrote: > Bits[15:0] in CBFRSYNRA register contain information about > StreamID of the incoming transaction that generated the > fault. Dump CBFRSYNRA register to get this info. > This is specially useful in a distributed SMMU architecture > where multiple masters are connected to the SMMU. > SID information helps to quickly identify the faulting > master device. > > Signed-off-by: Vivek Gautam > --- > > V1 of the patch available @ > https://lore.kernel.org/patchwork/patch/1061615/ > > Changes from v1: > - Dump the raw register value of CBFRSYNRA register in the > context fault log rather than extracting the SID inforamtion > and dumping that. > > drivers/iommu/arm-smmu-regs.h | 2 ++ > drivers/iommu/arm-smmu.c | 8 ++++++-- > 2 files changed, 8 insertions(+), 2 deletions(-) > > diff --git a/drivers/iommu/arm-smmu-regs.h b/drivers/iommu/arm-smmu-regs.h > index a1226e4ab5f8..e9132a926761 100644 > --- a/drivers/iommu/arm-smmu-regs.h > +++ b/drivers/iommu/arm-smmu-regs.h > @@ -147,6 +147,8 @@ enum arm_smmu_s2cr_privcfg { > #define CBAR_IRPTNDX_SHIFT 24 > #define CBAR_IRPTNDX_MASK 0xff > > +#define ARM_SMMU_GR1_CBFRSYNRA(n) (0x400 + ((n) << 2)) > + > #define ARM_SMMU_GR1_CBA2R(n) (0x800 + ((n) << 2)) > #define CBA2R_RW64_32BIT (0 << 0) > #define CBA2R_RW64_64BIT (1 << 0) > diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c > index 045d93884164..a4773e8c6b0e 100644 > --- a/drivers/iommu/arm-smmu.c > +++ b/drivers/iommu/arm-smmu.c > @@ -575,7 +575,9 @@ static irqreturn_t arm_smmu_context_fault(int irq, void *dev) > struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain); > struct arm_smmu_cfg *cfg = &smmu_domain->cfg; > struct arm_smmu_device *smmu = smmu_domain->smmu; > + void __iomem *gr1_base = ARM_SMMU_GR1(smmu); > void __iomem *cb_base; > + u32 cbfrsynra; > > cb_base = ARM_SMMU_CB(smmu, cfg->cbndx); > fsr = readl_relaxed(cb_base + ARM_SMMU_CB_FSR); > @@ -585,10 +587,12 @@ static irqreturn_t arm_smmu_context_fault(int irq, void *dev) > > fsynr = readl_relaxed(cb_base + ARM_SMMU_CB_FSYNR0); > iova = readq_relaxed(cb_base + ARM_SMMU_CB_FAR); > + cbfrsynra = readl_relaxed(gr1_base + > + ARM_SMMU_GR1_CBFRSYNRA(cfg->cbndx)); The 80 char limit is more like a guideline anyways...please don't wrap this. > > dev_err_ratelimited(smmu->dev, > - "Unhandled context fault: fsr=0x%x, iova=0x%08lx, fsynr=0x%x, cb=%d\n", > - fsr, iova, fsynr, cfg->cbndx); > + "Unhandled context fault: fsr=0x%x, iova=0x%08lx, fsynr=0x%x, cbfrsynra = 0x%x, cb=%d\n", Drop the spaces around '='. With those addressed, you have my Reviewed-by: Bjorn Andersson Regards, Bjorn > + fsr, iova, fsynr, cbfrsynra, cfg->cbndx); > > writel(fsr, cb_base + ARM_SMMU_CB_FSR); > return IRQ_HANDLED; > -- > QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member > of Code Aurora Forum, hosted by The Linux Foundation >