Messages in this thread | | | Date | Mon, 1 Jun 2015 11:09:40 +0800 | From | Baoquan He <> | Subject | A question about state machine function state_next() |
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Hi Joerg,
I am reading amd iommu code because I have some knowledge about intel iommu since review Zhenhua's fixing kdump error patches. Now there's a question I didn't find answer.
In amd iommu state_next() is the state machine running function. However I only found 4 function to call iommu_go_to_state() to change the state, they are: amd_iommu_detect() amd_iommu_prepare() amd_iommu_enable() amd_iommu_init()
And they are called according to above sequence. It means only below 4 cases are checked and the code blocks are executed. Then where to call amd_iommu_enable_interrupts() and amd_iommu_init_dma(). Could you help to tell what I missed?
static int __init state_next(void) { int ret = 0;
switch (init_state) { case IOMMU_START_STATE: //checked and execute case IOMMU_IVRS_DETECTED: //checked and execute case IOMMU_ACPI_FINISHED: //checked and execute case IOMMU_ENABLED: //checked and execute ... }
Thanks Baoquan
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