On Mon, 12 Sep 2016 20:58:42 +0200 Tomasz Nowicki tn@semihalf.com wrote:
On 12.09.2016 20:54, 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_Remapp...
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 acpi_iort_init() 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
IORT support is placed under drivers/acpi/arm64/ new directory due to its ARM64 specific nature. The code there is considered only for ARM64. The long term plan is to keep all ARM64 specific tables support in this place e.g. GTDT table.
Signed-off-by: Tomasz Nowicki tn@semihalf.com Acked-by: Rafael J. Wysocki rjw@rjwysocki.net Reviewed-by: Hanjun Guo hanjun.guo@linaro.org Reviewed-by: Lorenzo Pieralisi lorenzo.pieralisi@arm.com
Hi Marc,
Series with updated patch 1 can be found: https://github.com/semihalf-nowicki-tomasz/linux.git (its-acpi-v11)
Sorry for zillions of patch updates...
I've swapped the two patches and pushed the result out again, but from now on, please send updates on top of irq/irqchip-4.9.
Thanks,
M.