ACPI: platform-msi: retrieve devid from IORT
authorHanjun Guo <hanjun.guo@linaro.org>
Tue, 7 Mar 2017 12:40:05 +0000 (20:40 +0800)
committerLorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Thu, 30 Mar 2017 09:12:40 +0000 (10:12 +0100)
commitae7c18380495ac5c14a614fdb6c452c3bf9148ac
treee6926157d85e0ecbd3c96fc13c603b598660f477
parent8ca4f1d3fbb85d8d87ca293500a69c3dc901beb9
ACPI: platform-msi: retrieve devid from IORT

For devices connecting to an ITS, the devices need to identify themself
through a devid; this devid is represented in the IORT table in named
component node [1] for platform devices, so this patch adds code that
scans the IORT table to retrieve the devices devid.

Add an IORT interface to collect ITS devices devid to carry out platform
devices MSI mappings with IORT tables.

[1]: https://static.docs.arm.com/den0049/b/DEN0049B_IO_Remapping_Table.pdf

Signed-off-by: Hanjun Guo <hanjun.guo@linaro.org>
[lorenzo.pieralisi@arm.com: rewrote commit log/dropped ITS changes]
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Tested-by: Ming Lei <ming.lei@canonical.com>
Tested-by: Wei Xu <xuwei5@hisilicon.com>
Tested-by: Sinan Kaya <okaya@codeaurora.org>
Cc: Marc Zyngier <marc.zyngier@arm.com>
Cc: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Tomasz Nowicki <tn@semihalf.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
drivers/acpi/arm64/iort.c
include/linux/acpi_iort.h