Hi Tomasz,
On 5 September 2016 at 14:12, Tomasz Nowicki tn@semihalf.com wrote:
On 02.09.2016 13:52, Fu Wei wrote:
Hi Tomasz,
On 11 August 2016 at 18:06, Tomasz Nowicki tn@semihalf.com 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 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
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 Reviewed-by: Hanjun Guo hanjun.guo@linaro.org
drivers/acpi/Kconfig | 5 + drivers/acpi/Makefile | 2 + drivers/acpi/arm64/Kconfig | 6 ++ drivers/acpi/arm64/Makefile | 1 + drivers/acpi/arm64/iort.c | 218 ++++++++++++++++++++++++++++++++++++++++++++ drivers/acpi/bus.c | 2 + include/linux/iort.h | 30 ++++++ 7 files changed, 264 insertions(+) create mode 100644 drivers/acpi/arm64/Kconfig create mode 100644 drivers/acpi/arm64/Makefile create mode 100644 drivers/acpi/arm64/iort.c create mode 100644 include/linux/iort.h
diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig index 445ce28..6cef2d1 100644 --- a/drivers/acpi/Kconfig +++ b/drivers/acpi/Kconfig @@ -521,4 +521,9 @@ config ACPI_CONFIGFS userspace. The configurable ACPI groups will be visible under /config/acpi, assuming configfs is mounted under /config.
+if ARM64 +source "drivers/acpi/arm64/Kconfig"
+endif
endif # ACPI diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile index 5ae9d85..e5ada78 100644 --- a/drivers/acpi/Makefile +++ b/drivers/acpi/Makefile @@ -105,3 +105,5 @@ obj-$(CONFIG_ACPI_CONFIGFS) += acpi_configfs.o
video-objs += acpi_video.o video_detect.o obj-y += dptf/
+obj-$(CONFIG_ARM64) += arm64/ diff --git a/drivers/acpi/arm64/Kconfig b/drivers/acpi/arm64/Kconfig new file mode 100644 index 0000000..fc818dc --- /dev/null +++ b/drivers/acpi/arm64/Kconfig @@ -0,0 +1,6 @@ +# +# ACPI Configuration for ARM64 +#
+config IORT_TABLE
Sorry for nit-picking, but is that better to use ACPI_IORT or maybe ARM64__IORT ??
ACPI_IORT sounds good.
Thanks, Tomasz :-) I have rebaseed my GTDT patchset on your v8 patchset, But before I post my new patchset, I hope we can harmonize with each other on these:
1. ACPI_IORT -- ACPI_GTDT 2. for the file name, maybe can follow "/drivers/acpi/acpi_*.c" like acpi_iort.c and acpi_gtdt.c or follow "/drivers/acpi/apei/*.c" like iort.c and gtdt.c.
looking forward to you new patchset :-) Thanks :-)
Tomasz