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Groups > linux.kernel > #1476136
| From | Tomasz Nowicki <tn@semihalf.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [Linaro-acpi] [PATCH V8 1/8] ACPI: I/O Remapping Table (IORT) initial support |
| Date | 2016-09-05 08:20 +0200 |
| Message-ID | <sdVq9-8oc-1@gated-at.bofh.it> (permalink) |
| References | <s4V61-2qB-7@gated-at.bofh.it> <s4V61-2qB-17@gated-at.bofh.it> <scVix-7sc-15@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
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_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@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. Tomasz
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Re: [Linaro-acpi] [PATCH V8 1/8] ACPI: I/O Remapping Table (IORT) initial support Fu Wei <fu.wei@linaro.org> - 2016-09-02 14:00 +0200
Re: [Linaro-acpi] [PATCH V8 1/8] ACPI: I/O Remapping Table (IORT) initial support Tomasz Nowicki <tn@semihalf.com> - 2016-09-05 08:20 +0200
Re: [Linaro-acpi] [PATCH V8 1/8] ACPI: I/O Remapping Table (IORT) initial support Fu Wei <fu.wei@linaro.org> - 2016-09-05 17:40 +0200
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