[PATCH V7 1/8] ACPI: I/O Remapping Table (IORT) initial support

Hi Marc,

On 06/22/2016 09:34 PM, Hanjun Guo wrote:

On 2016/6/22 22:51, Marc Zyngier wrote:

quoted

On 22/06/16 14:52, Tomasz Nowicki wrote:

quoted

On 22.06.2016 15:25, Marc Zyngier wrote:

quoted

On 22/06/16 13:35, Tomasz Nowicki wrote:

quoted

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 <redacted>
---
  drivers/acpi/Kconfig  |   3 +
  drivers/acpi/Makefile |   1 +
  drivers/acpi/bus.c    |   2 +
  drivers/acpi/iort.c   | 217 ++++++++++++++++++++++++++++++++++++++++++++++++++
  include/linux/iort.h  |  30 +++++++
  5 files changed, 253 insertions(+)
  create mode 100644 drivers/acpi/iort.c
  create mode 100644 include/linux/iort.h

I tracked Marc's tree on git.kernel.org, it's  acpi_os_free(buffer.pointer) there so
my worry is gone :)

Do you plan on submitting this during the 4.8 merge window?

Thanks,
Cov

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