Hi Fernando,
> +int mmu_fault_isr(struct iommu *mmu)
>
> -/*
> - * ======== mmu_check_if_fault =======
> - * Check to see if MMU Fault is valid TLB miss from DSP
> - * Note: This function is called from an ISR
> - */
> -static bool mmu_check_if_fault(struct bridge_dev_context *dev_context)
> {
> + struct deh_mgr *dm;
> + u32 da;
> +
> + dev_get_deh_mgr(dev_get_first(), &dm);
> +
> + if (!dm)
> + return -EPERM;
> +
> + da = iommu_read_reg(mmu, MMU_FAULT_AD);
> + iommu_write_reg(mmu, 0, MMU_IRQENABLE);
-- Isn't the MMU already enabled at this point when the function callback is called by iommu ?
> + dm->err_info.dw_val1 = da;
> + tasklet_schedule(&dm->dpc_tasklet);
-- The iommu fault isr disables the IOMMU at the end of the fault handler, so by the time your tasklet is scheduled you might have the MMU in a disabled state. Looks to me either this requires change in iommu to remove the disable part or enable the MMU in the tasklet instead of doing it early in mmu_fault_isr.
Thank you,
Best regards,
Hari
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