ascend inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I8OX0Z CVE: NA

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Add suspend and resume support for smmuv3. The smmu is stopped when suspending and started when resuming.

Signed-off-by: Yuan Can yuancan@huawei.com --- drivers/iommu/Kconfig | 7 ++ drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c | 97 ++++++++++++++++++--- drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h | 2 + 3 files changed, 96 insertions(+), 10 deletions(-)

diff --git a/drivers/iommu/Kconfig b/drivers/iommu/Kconfig index 2b12b583ef4b..2ecee01222d4 100644 --- a/drivers/iommu/Kconfig +++ b/drivers/iommu/Kconfig @@ -412,6 +412,13 @@ config ARM_SMMU_V3_SVA Say Y here if your system supports SVA extensions such as PCIe PASID and PRI.

+config ARM_SMMU_V3_PM + bool "Add arm_smmu_v3 suspend and resume support" + depends on ARM_SMMU_V3 && PM_SLEEP + default n + help + Add support for suspend and resume support for arm smmu v3. + config S390_IOMMU def_bool y if S390 && PCI depends on S390 && PCI 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 bd0a596f9863..4d417b4243eb 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.c @@ -3154,6 +3154,13 @@ static void arm_smmu_write_msi_msg(struct msi_desc *desc, struct msi_msg *msg) doorbell = (((u64)msg->address_hi) << 32) | msg->address_lo; doorbell &= MSI_CFG0_ADDR_MASK;

+#ifdef CONFIG_ARM_SMMU_V3_PM + /* Saves the msg (base addr of msi irq) and restores it during resume */ + desc->msg.address_lo = msg->address_lo; + desc->msg.address_hi = msg->address_hi; + desc->msg.data = msg->data; +#endif + writeq_relaxed(doorbell, smmu->base + cfg[0]); writel_relaxed(msg->data, smmu->base + cfg[1]); writel_relaxed(ARM_SMMU_MEMATTR_DEVICE_nGnRE, smmu->base + cfg[2]); @@ -3196,11 +3203,51 @@ static void arm_smmu_setup_msis(struct arm_smmu_device *smmu) devm_add_action(dev, arm_smmu_free_msis, dev); }

-static void arm_smmu_setup_unique_irqs(struct arm_smmu_device *smmu) +#ifdef CONFIG_ARM_SMMU_V3_PM +static void arm_smmu_resume_msis(struct arm_smmu_device *smmu) +{ + struct msi_desc *desc; + struct device *dev = smmu->dev; + + msi_for_each_desc(desc, dev, MSI_DESC_ALL) { + switch (desc->msi_index) { + case EVTQ_MSI_INDEX: + case GERROR_MSI_INDEX: + case PRIQ_MSI_INDEX: { + phys_addr_t *cfg = arm_smmu_msi_cfg[desc->msi_index]; + struct msi_msg *msg = &desc->msg; + phys_addr_t doorbell = (((u64)msg->address_hi) << 32) | msg->address_lo; + + doorbell &= MSI_CFG0_ADDR_MASK; + writeq_relaxed(doorbell, smmu->base + cfg[0]); + writel_relaxed(msg->data, smmu->base + cfg[1]); + writel_relaxed(ARM_SMMU_MEMATTR_DEVICE_nGnRE, + smmu->base + cfg[2]); + break; + } + default: + continue; + + } + } +} +#else +static void arm_smmu_resume_msis(struct arm_smmu_device *smmu) +{ +} +#endif + +static void arm_smmu_setup_unique_irqs(struct arm_smmu_device *smmu, bool resume) { int irq, ret;

- arm_smmu_setup_msis(smmu); + if (!resume) + arm_smmu_setup_msis(smmu); + else { + /* The irq doesn't need to be re-requested during resume */ + arm_smmu_resume_msis(smmu); + return; + }

/* Request interrupt lines */ irq = smmu->evtq.q.irq; @@ -3242,7 +3289,7 @@ static void arm_smmu_setup_unique_irqs(struct arm_smmu_device *smmu) } }

-static int arm_smmu_setup_irqs(struct arm_smmu_device *smmu) +static int arm_smmu_setup_irqs(struct arm_smmu_device *smmu, bool resume) { int ret, irq; u32 irqen_flags = IRQ_CTRL_EVTQ_IRQEN | IRQ_CTRL_GERROR_IRQEN; @@ -3269,7 +3316,7 @@ static int arm_smmu_setup_irqs(struct arm_smmu_device *smmu) if (ret < 0) dev_warn(smmu->dev, "failed to enable combined irq\n"); } else - arm_smmu_setup_unique_irqs(smmu); + arm_smmu_setup_unique_irqs(smmu, resume);

if (smmu->features & ARM_SMMU_FEAT_PRI) irqen_flags |= IRQ_CTRL_PRIQ_IRQEN; @@ -3294,7 +3341,7 @@ static int arm_smmu_device_disable(struct arm_smmu_device *smmu) return ret; }

-static int arm_smmu_device_reset(struct arm_smmu_device *smmu, bool bypass) +static int arm_smmu_device_reset(struct arm_smmu_device *smmu, bool resume) { int ret; u32 reg, enables; @@ -3402,7 +3449,7 @@ static int arm_smmu_device_reset(struct arm_smmu_device *smmu, bool bypass) } }

- ret = arm_smmu_setup_irqs(smmu); + ret = arm_smmu_setup_irqs(smmu, resume); if (ret) { dev_err(smmu->dev, "failed to setup irqs\n"); return ret; @@ -3412,7 +3459,7 @@ static int arm_smmu_device_reset(struct arm_smmu_device *smmu, bool bypass) enables &= ~(CR0_EVTQEN | CR0_PRIQEN);

/* Enable the SMMU interface, or ensure bypass */ - if (!bypass || disable_bypass) { + if (!smmu->bypass || disable_bypass) { enables |= CR0_SMMUEN; } else { ret = arm_smmu_update_gbpa(smmu, 0, GBPA_ABORT); @@ -3767,6 +3814,26 @@ static void __iomem *arm_smmu_ioremap(struct device *dev, resource_size_t start, return devm_ioremap_resource(dev, &res); }

+#ifdef CONFIG_ARM_SMMU_V3_PM +static int arm_smmu_suspend(struct device *dev) +{ + /* + * The smmu is powered off and related registers are automatically + * cleared when suspend. No need to do anything. + */ + return 0; +} + +static int arm_smmu_resume(struct device *dev) +{ + struct arm_smmu_device *smmu = dev_get_drvdata(dev); + + arm_smmu_device_reset(smmu, true); + + return 0; +} +#endif + static void arm_smmu_rmr_install_bypass_ste(struct arm_smmu_device *smmu) { struct list_head rmr_list; @@ -3804,7 +3871,6 @@ static int arm_smmu_device_probe(struct platform_device *pdev) resource_size_t ioaddr; struct arm_smmu_device *smmu; struct device *dev = &pdev->dev; - bool bypass;

smmu = devm_kzalloc(dev, sizeof(*smmu), GFP_KERNEL); if (!smmu) @@ -3820,7 +3886,7 @@ static int arm_smmu_device_probe(struct platform_device *pdev) }

/* Set bypass mode according to firmware probing result */ - bypass = !!ret; + smmu->bypass = !!ret;

/* Base address */ res = platform_get_resource(pdev, IORESOURCE_MEM, 0); @@ -3884,7 +3950,7 @@ static int arm_smmu_device_probe(struct platform_device *pdev) arm_smmu_rmr_install_bypass_ste(smmu);

/* Reset the device */ - ret = arm_smmu_device_reset(smmu, bypass); + ret = arm_smmu_device_reset(smmu, false); if (ret) return ret;

@@ -3928,6 +3994,16 @@ static const struct of_device_id arm_smmu_of_match[] = { }; MODULE_DEVICE_TABLE(of, arm_smmu_of_match);

+#ifdef CONFIG_ARM_SMMU_V3_PM +static const struct dev_pm_ops arm_smmu_pm_ops = { + .suspend = arm_smmu_suspend, + .resume = arm_smmu_resume, +}; +#define ARM_SMMU_PM_OPS (&arm_smmu_pm_ops) +#else +#define ARM_SMMU_PM_OPS NULL +#endif + static void arm_smmu_driver_unregister(struct platform_driver *drv) { arm_smmu_sva_notifier_synchronize(); @@ -3939,6 +4015,7 @@ static struct platform_driver arm_smmu_driver = { .name = "arm-smmu-v3", .of_match_table = arm_smmu_of_match, .suppress_bind_attrs = true, + .pm = ARM_SMMU_PM_OPS, }, .probe = arm_smmu_device_probe, .remove_new = arm_smmu_device_remove, diff --git a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h index 9915850dd4db..269b6fa705d4 100644 --- a/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h +++ b/drivers/iommu/arm/arm-smmu-v3/arm-smmu-v3.h @@ -682,6 +682,8 @@ struct arm_smmu_device {

struct rb_root streams; struct mutex streams_mutex; + + bool bypass; };

struct arm_smmu_stream {