Messages in this thread | | | Subject | Re: [PATCH V7 1/8] ACPI: I/O Remapping Table (IORT) initial support | From | Tomasz Nowicki <> | Date | Wed, 22 Jun 2016 14:40:28 +0200 |
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On 22.06.2016 14:35, Tomasz Nowicki wrote: > IORT shows representation of IO topology for ARM based systems. > It describes how various components are connected together on > parent-child basis e.g. PCI RC -> SMMU -> ITS. Also see IORT spec. > http://infocenter.arm.com/help/topic/com.arm.doc.den0049b/DEN0049B_IO_Remapping_Table.pdf > > Initial support allows to detect IORT table presence and save its > root pointer obtained through acpi_get_table(). The pointer validity > depends on acpi_gbl_permanent_mmap because if acpi_gbl_permanent_mmap > is not set while using IORT nodes we would dereference unmapped pointers. > > For the aforementioned reason call iort_table_detect() from acpi_init() > which guarantees acpi_gbl_permanent_mmap to be set at that point. > > Add generic helpers which are helpful for scanning and retrieving > information from IORT table content. List of the most important helpers: > - iort_find_dev_node() finds IORT node for a given device > - iort_node_map_rid() maps device RID and returns IORT node which provides > final translation > > Signed-off-by: Tomasz Nowicki <tn@semihalf.com>
The updated patch incorporates fixes and addresses Lorenzo's comments. The whole series is here: https://github.com/semihalf-nowicki-tomasz/linux.git (its-acpi-v7.1)
Thanks, Tomasz
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