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Message-ID: <ba3f527e-5f84-164b-f910-7ef9d7866520@nvidia.com>
Date: Wed, 8 Jul 2020 13:28:10 +0100
From: Jon Hunter <jonathanh@...dia.com>
To: Krishna Reddy <vdumpa@...dia.com>, <joro@...tes.org>,
<will@...nel.org>, <robin.murphy@....com>, <robh+dt@...nel.org>,
<treding@...dia.com>
CC: <devicetree@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<iommu@...ts.linux-foundation.org>, <linux-kernel@...r.kernel.org>,
<linux-tegra@...r.kernel.org>, <yhsu@...dia.com>,
<snikam@...dia.com>, <praithatha@...dia.com>, <talho@...dia.com>,
<bbiswas@...dia.com>, <mperttunen@...dia.com>,
<nicolinc@...dia.com>, <bhuntsman@...dia.com>,
<nicoleotsuka@...il.com>
Subject: Re: [PATCH v10 5/5] iommu/arm-smmu: Add global/context fault
implementation hooks
On 08/07/2020 06:00, Krishna Reddy wrote:
> Add global/context fault hooks to allow vendor specific implementations
> override default fault interrupt handlers.
>
> Update NVIDIA implementation to override the default global/context fault
> interrupt handlers and handle interrupts across the two ARM MMU-500s that
> are programmed identically.
>
> Signed-off-by: Krishna Reddy <vdumpa@...dia.com>
> ---
> drivers/iommu/arm-smmu-nvidia.c | 99 +++++++++++++++++++++++++++++++++
> drivers/iommu/arm-smmu.c | 17 +++++-
> drivers/iommu/arm-smmu.h | 3 +
> 3 files changed, 117 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/iommu/arm-smmu-nvidia.c b/drivers/iommu/arm-smmu-nvidia.c
> index 2f55e5793d34..31368057e9be 100644
> --- a/drivers/iommu/arm-smmu-nvidia.c
> +++ b/drivers/iommu/arm-smmu-nvidia.c
> @@ -127,6 +127,103 @@ static int nvidia_smmu_reset(struct arm_smmu_device *smmu)
> return 0;
> }
>
> +static irqreturn_t nvidia_smmu_global_fault_inst(int irq,
> + struct arm_smmu_device *smmu,
> + int inst)
> +{
> + u32 gfsr, gfsynr0, gfsynr1, gfsynr2;
> + void __iomem *gr0_base = nvidia_smmu_page(smmu, inst, 0);
> +
> + gfsr = readl_relaxed(gr0_base + ARM_SMMU_GR0_sGFSR);
> + if (!gfsr)
> + return IRQ_NONE;
> +
> + gfsynr0 = readl_relaxed(gr0_base + ARM_SMMU_GR0_sGFSYNR0);
> + gfsynr1 = readl_relaxed(gr0_base + ARM_SMMU_GR0_sGFSYNR1);
> + gfsynr2 = readl_relaxed(gr0_base + ARM_SMMU_GR0_sGFSYNR2);
> +
> + dev_err_ratelimited(smmu->dev,
> + "Unexpected global fault, this could be serious\n");
> + dev_err_ratelimited(smmu->dev,
> + "\tGFSR 0x%08x, GFSYNR0 0x%08x, GFSYNR1 0x%08x, GFSYNR2 0x%08x\n",
> + gfsr, gfsynr0, gfsynr1, gfsynr2);
> +
> + writel_relaxed(gfsr, gr0_base + ARM_SMMU_GR0_sGFSR);
> + return IRQ_HANDLED;
> +}
> +
> +static irqreturn_t nvidia_smmu_global_fault(int irq, void *dev)
> +{
> + unsigned int inst;
> + irqreturn_t ret = IRQ_NONE;
> + struct arm_smmu_device *smmu = dev;
> +
> + for (inst = 0; inst < NUM_SMMU_INSTANCES; inst++) {
> + irqreturn_t irq_ret;
> +
> + irq_ret = nvidia_smmu_global_fault_inst(irq, smmu, inst);
> + if (irq_ret == IRQ_HANDLED)
> + ret = IRQ_HANDLED;
> + }
> +
> + return ret;
> +}
> +
> +static irqreturn_t nvidia_smmu_context_fault_bank(int irq,
> + struct arm_smmu_device *smmu,
> + int idx, int inst)
> +{
> + u32 fsr, fsynr, cbfrsynra;
> + unsigned long iova;
> + void __iomem *gr1_base = nvidia_smmu_page(smmu, inst, 1);
> + void __iomem *cb_base = nvidia_smmu_page(smmu, inst, smmu->numpage + idx);
> +
> + fsr = readl_relaxed(cb_base + ARM_SMMU_CB_FSR);
> + if (!(fsr & ARM_SMMU_FSR_FAULT))
> + return IRQ_NONE;
> +
> + 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(idx));
> +
> + dev_err_ratelimited(smmu->dev,
> + "Unhandled context fault: fsr=0x%x, iova=0x%08lx, fsynr=0x%x, cbfrsynra=0x%x, cb=%d\n",
> + fsr, iova, fsynr, cbfrsynra, idx);
> +
> + writel_relaxed(fsr, cb_base + ARM_SMMU_CB_FSR);
> + return IRQ_HANDLED;
> +}
> +
> +static irqreturn_t nvidia_smmu_context_fault(int irq, void *dev)
> +{
> + int idx;
> + unsigned int inst;
> + irqreturn_t ret = IRQ_NONE;
> + struct arm_smmu_device *smmu;
> + struct iommu_domain *domain = dev;
> + struct arm_smmu_domain *smmu_domain;
> +
> + smmu_domain = container_of(domain, struct arm_smmu_domain, domain);
> + smmu = smmu_domain->smmu;
> +
> + for (inst = 0; inst < NUM_SMMU_INSTANCES; inst++) {
> + irqreturn_t irq_ret;
> +
> + /*
> + * Interrupt line is shared between all contexts.
> + * Check for faults across all contexts.
> + */
> + for (idx = 0; idx < smmu->num_context_banks; idx++) {
> + irq_ret = nvidia_smmu_context_fault_bank(irq, smmu,
> + idx, inst);
> + if (irq_ret == IRQ_HANDLED)
> + ret = IRQ_HANDLED;
> + }
> + }
> +
> + return ret;
> +}
> +
> static const struct arm_smmu_impl nvidia_smmu_impl = {
> .read_reg = nvidia_smmu_read_reg,
> .write_reg = nvidia_smmu_write_reg,
> @@ -134,6 +231,8 @@ static const struct arm_smmu_impl nvidia_smmu_impl = {
> .write_reg64 = nvidia_smmu_write_reg64,
> .reset = nvidia_smmu_reset,
> .tlb_sync = nvidia_smmu_tlb_sync,
> + .global_fault = nvidia_smmu_global_fault,
> + .context_fault = nvidia_smmu_context_fault,
> };
>
> struct arm_smmu_device *nvidia_smmu_impl_init(struct arm_smmu_device *smmu)
> diff --git a/drivers/iommu/arm-smmu.c b/drivers/iommu/arm-smmu.c
> index c123a5814f70..020afddfaa0f 100644
> --- a/drivers/iommu/arm-smmu.c
> +++ b/drivers/iommu/arm-smmu.c
> @@ -670,6 +670,7 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
> enum io_pgtable_fmt fmt;
> struct arm_smmu_domain *smmu_domain = to_smmu_domain(domain);
> struct arm_smmu_cfg *cfg = &smmu_domain->cfg;
> + irqreturn_t (*context_fault)(int irq, void *dev);
>
> mutex_lock(&smmu_domain->init_mutex);
> if (smmu_domain->smmu)
> @@ -832,7 +833,13 @@ static int arm_smmu_init_domain_context(struct iommu_domain *domain,
> * handler seeing a half-initialised domain state.
> */
> irq = smmu->irqs[smmu->num_global_irqs + cfg->irptndx];
> - ret = devm_request_irq(smmu->dev, irq, arm_smmu_context_fault,
> +
> + if (smmu->impl && smmu->impl->context_fault)
> + context_fault = smmu->impl->context_fault;
> + else
> + context_fault = arm_smmu_context_fault;
> +
> + ret = devm_request_irq(smmu->dev, irq, context_fault,
> IRQF_SHARED, "arm-smmu-context-fault", domain);
> if (ret < 0) {
> dev_err(smmu->dev, "failed to request context IRQ %d (%u)\n",
> @@ -2105,6 +2112,7 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
> struct arm_smmu_device *smmu;
> struct device *dev = &pdev->dev;
> int num_irqs, i, err;
> + irqreturn_t (*global_fault)(int irq, void *dev);
>
> smmu = devm_kzalloc(dev, sizeof(*smmu), GFP_KERNEL);
> if (!smmu) {
> @@ -2191,9 +2199,14 @@ static int arm_smmu_device_probe(struct platform_device *pdev)
> smmu->num_context_irqs = smmu->num_context_banks;
> }
>
> + if (smmu->impl && smmu->impl->global_fault)
> + global_fault = smmu->impl->global_fault;
> + else
> + global_fault = arm_smmu_global_fault;
> +
> for (i = 0; i < smmu->num_global_irqs; ++i) {
> err = devm_request_irq(smmu->dev, smmu->irqs[i],
> - arm_smmu_global_fault,
> + global_fault,
> IRQF_SHARED,
> "arm-smmu global fault",
> smmu);
> diff --git a/drivers/iommu/arm-smmu.h b/drivers/iommu/arm-smmu.h
> index fad63efa1a72..d890a4a968e8 100644
> --- a/drivers/iommu/arm-smmu.h
> +++ b/drivers/iommu/arm-smmu.h
> @@ -18,6 +18,7 @@
> #include <linux/io-64-nonatomic-hi-lo.h>
> #include <linux/io-pgtable.h>
> #include <linux/iommu.h>
> +#include <linux/irqreturn.h>
> #include <linux/mutex.h>
> #include <linux/spinlock.h>
> #include <linux/types.h>
> @@ -389,6 +390,8 @@ struct arm_smmu_impl {
> void (*tlb_sync)(struct arm_smmu_device *smmu, int page, int sync,
> int status);
> int (*def_domain_type)(struct device *dev);
> + irqreturn_t (*global_fault)(int irq, void *dev);
> + irqreturn_t (*context_fault)(int irq, void *dev);
> };
>
> static inline void __iomem *arm_smmu_page(struct arm_smmu_device *smmu, int n)
>
Reviewed-by: Jon Hunter <jonathanh@...dia.com>
Thanks!
Jon
--
nvpublic
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