Hi Tomasz, On 5 September 2016 at 14:12, Tomasz Nowicki <tn@xxxxxxxxxxxx> wrote: > On 02.09.2016 13:52, Fu Wei wrote: >> >> Hi Tomasz, >> >> On 11 August 2016 at 18:06, Tomasz Nowicki <tn@xxxxxxxxxxxx> 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 >>> >>> 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@xxxxxxxxxxxx> >>> Reviewed-by: Hanjun Guo <hanjun.guo@xxxxxxxxxx> >>> --- >>> 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 -- Best regards, Fu Wei Software Engineer Red Hat -- To unsubscribe from this list: send the line "unsubscribe linux-pci" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
