diff --git a/drivers/iommu/arm-smmu-v3.c b/drivers/iommu/arm-smmu-v3.c index 7fb5230cd145eca89fb433234d5337f87bbcdb82..446703eeee7abc3f862837fd86393df771dbb43b 100644 --- a/drivers/iommu/arm-smmu-v3.c +++ b/drivers/iommu/arm-smmu-v3.c @@ -24,6 +24,7 @@ #include #include #include +#include #include #include #include @@ -2212,8 +2213,12 @@ static int arm_smmu_update_gbpa(struct arm_smmu_device *smmu, u32 set, u32 clr) reg &= ~clr; reg |= set; writel_relaxed(reg | GBPA_UPDATE, gbpa); - return readl_relaxed_poll_timeout(gbpa, reg, !(reg & GBPA_UPDATE), - 1, ARM_SMMU_POLL_TIMEOUT_US); + ret = readl_relaxed_poll_timeout(gbpa, reg, !(reg & GBPA_UPDATE), + 1, ARM_SMMU_POLL_TIMEOUT_US); + + if (ret) + dev_err(smmu->dev, "GBPA not responding to update\n"); + return ret; } static void arm_smmu_free_msis(void *data) @@ -2393,8 +2398,15 @@ static int arm_smmu_device_reset(struct arm_smmu_device *smmu, bool bypass) /* Clear CR0 and sync (disables SMMU and queue processing) */ reg = readl_relaxed(smmu->base + ARM_SMMU_CR0); - if (reg & CR0_SMMUEN) + if (reg & CR0_SMMUEN) { + if (is_kdump_kernel()) { + arm_smmu_update_gbpa(smmu, GBPA_ABORT, 0); + arm_smmu_device_disable(smmu); + return -EBUSY; + } + dev_warn(smmu->dev, "SMMU currently enabled! Resetting...\n"); + } ret = arm_smmu_device_disable(smmu); if (ret) @@ -2492,10 +2504,8 @@ static int arm_smmu_device_reset(struct arm_smmu_device *smmu, bool bypass) enables |= CR0_SMMUEN; } else { ret = arm_smmu_update_gbpa(smmu, 0, GBPA_ABORT); - if (ret) { - dev_err(smmu->dev, "GBPA not responding to update\n"); + if (ret) return ret; - } } ret = arm_smmu_write_reg_sync(smmu, enables, ARM_SMMU_CR0, ARM_SMMU_CR0ACK);