Linaro-acpi

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820 discussions

[PATCH V7 00/11] Support for generic ACPI based PCI host controller

by Tomasz Nowicki

>From the functionality point of view this series may be split into the following logic parts: 1. New ECAM API and update for users of the pci-host-common API 2. Necessary fixes as the preparation for using driver on ARM64. 3. Use new MCFG interface and implement generic ACPI based PCI host controller driver. 4. Enable above driver on ARM64 Patches has been built on top of 4.6-rc7 and can be found here: git@github.com:semihalf-nowicki-tomasz/linux.git (pci-acpi-v7) This has been tested on Cavium ThunderX server. Any help in reviewing and testing is very appreciated. v6 -> v7 - drop quirks handling - changes for ACPI companion and domain number assignment approach - implement arch pcibios_{add|remove}_bus and call acpi_pci_{add|remove}_bus from there - cleanups around nomenclature - use resources oriented API for ECAM - fix for based address calculation before mapping ECAM region - remove useless lock for MCFG lookup - move MCFG stuff to separated file pci_mcfg.c - drop MCFG entries caching - rebase against 4.6-rc7 v5 -> v6 - drop idea of x86 MMCONFIG code refactoring - integrate JC's patches which introduce new ECAM API: https://lkml.org/lkml/2016/4/11/907 git: https://github.com/jchandra-brcm/linux/ (arm64-acpi-pci-v3) - integrate Sinan's fix for releasing IO resources, see patch [06/13] - added ACPI support for ThunderX ECAM and PEM drivers - rebase against 4.6-rc2 v4 -> v5 - drop MCFG refactoring group patches 1-6 from series v4 and integrate Jayachandran's patch https://patchwork.ozlabs.org/patch/575525/ - rewrite PCI legacy IRQs allocation - squash two patches 11 and 12 from series v4, fixed bisection issue - changelog improvements - rebase against 4.5-rc3 v3 -> v4 - drop Jiang's fix http://lkml.iu.edu/hypermail/linux/kernel/1601.1/04318.html - add Lorenzo's fix patch 19/24 - ACPI PCI bus domain number assigning cleanup - change resource management, we now claim and reassign resources - improvements for applying quirks - drop Matthew's http://www.spinics.net/lists/linux-pci/msg45950.html dependency - rebase against 4.5-rc1 v2 -> v3 - fix legacy IRQ assigning and IO ports registration - remove reference to arch specific companion device for ia64 - move ACPI PCI host controller driver to pci_root.c - drop generic domain assignment for x86 and ia64 as I am not able to run all necessary test variants - drop patch which cleaned legacy IRQ assignment since it belongs to Mathew's series: https://patchwork.ozlabs.org/patch/557504/ - extend MCFG quirk code - rebase against 4.4 v1 -> v2 - move non-arch specific piece of code to dirver/acpi/ directory - fix IO resource handling - introduce PCI config accessors quirks matching - moved ACPI_COMPANION_SET to generic code v1 - https://lkml.org/lkml/2015/10/27/504 v2 - https://lkml.org/lkml/2015/12/16/246 v3 - http://lkml.iu.edu/hypermail/linux/kernel/1601.1/04308.html v4 - https://lkml.org/lkml/2016/2/4/646 v5 - https://lkml.org/lkml/2016/2/16/426 v6 - https://lkml.org/lkml/2016/4/15/594 Jayachandran C (2): PCI: Provide common functions for ECAM mapping PCI: generic, thunder: update to use generic ECAM API Tomasz Nowicki (9): pci, of: Move the PCI I/O space management to PCI core code. pci: Add new function to unmap IO resources. acpi, pci: Support IO resources when parsing PCI host bridge resources. pci, acpi: Provide a way to assign bus domain number. pci, acpi: Handle ACPI companion assignment. pci, acpi: Support for ACPI based generic PCI host controller arm64, pci, acpi: ACPI support for legacy IRQs parsing and consolidation with DT code. arm64, pci, acpi: Provide ACPI-specific prerequisites for PCI bus enumeration. arm64, pci, acpi: Start using ACPI based PCI host controller driver for ARM64. arch/arm64/Kconfig | 1 + arch/arm64/kernel/pci.c | 34 +++----- drivers/acpi/Kconfig | 8 ++ drivers/acpi/Makefile | 1 + drivers/acpi/pci_mcfg.c | 97 ++++++++++++++++++++++ drivers/acpi/pci_root.c | 33 ++++++++ drivers/acpi/pci_root_generic.c | 149 +++++++++++++++++++++++++++++++++ drivers/of/address.c | 116 +------------------------- drivers/pci/Kconfig | 3 + drivers/pci/Makefile | 2 + drivers/pci/ecam.c | 161 ++++++++++++++++++++++++++++++++++++ drivers/pci/ecam.h | 72 ++++++++++++++++ drivers/pci/host/Kconfig | 1 + drivers/pci/host/pci-host-common.c | 114 +++++++++++-------------- drivers/pci/host/pci-host-common.h | 47 ----------- drivers/pci/host/pci-host-generic.c | 52 +++--------- drivers/pci/host/pci-thunder-ecam.c | 39 ++------- drivers/pci/host/pci-thunder-pem.c | 92 ++++++++++----------- drivers/pci/pci.c | 150 ++++++++++++++++++++++++++++++++- drivers/pci/probe.c | 2 + include/linux/of_address.h | 9 -- include/linux/pci-acpi.h | 14 ++++ include/linux/pci.h | 11 ++- 23 files changed, 823 insertions(+), 385 deletions(-) create mode 100644 drivers/acpi/pci_mcfg.c create mode 100644 drivers/acpi/pci_root_generic.c create mode 100644 drivers/pci/ecam.c create mode 100644 drivers/pci/ecam.h delete mode 100644 drivers/pci/host/pci-host-common.h -- 1.9.1

8 years

Fwd: Firmware Test Suite 16.05.01 is released

by Alex Hung

FWTS 16.05.01 is released. It is available from: Tar: http://fwts.ubuntu.com/release/fwts-V16.05.01.tar.gz PPA: https://launchpad.net/~firmware-testing-team/+archive/ubuntu/ppa-fwts-stable Release notes: https://wiki.ubuntu.com/FirmwareTestSuite/ReleaseNotes/16.05.01 = New Features = * acpi: add MSCT table sanity check * acpi: add EINJ table sanity check * ACPICA: Update to version 20160318 (LP: #1559312) * Introduce olog scan, to check OPAL msglog. * Introduce IPMI BMC Info * devicetree: add infrastructure for device-tree tests * devicetree/dt_sysinfo: Add device tree system information tests * devicetree/dt_base: Add base device-tree validity checks * debian/control: change depends on libjson0-dev to libjson-c-dev * auto-packager: mkpackage.sh: add yakkety and remove vivid * debian/control: add back libjson0-dev for precise = Fixed Bugs = * cpufreq: skip frequency performance test if cpufreq_settable is false * cpufreq: skip frequency claimed maximum test with intel_pstate * Add .gitignore * Add cppcheck static analysis checking script * uefi: uefirtauthvar: capitalize macro getvar_buf_size * cpufreq: make stat failure message a little more human friendly * acpi: einj, msct: only build in these tests on ACPI enabled systems * hpet: warn if HPET Device address not found in DSDT/SSDT * kernelscan: speed up parser using hash lookup, add more print funcs * kernelscan: remove need to pre-process with a CPP phase * kernelscan.sh: remove -E and -P phases to parsing * uefidump: dump the optional data for load option on boot device * uefidump: dump the optional data for load option on driver device * uefidump: add checking the resonable path list length for load option * pipeio: Add fwts_pipe_open_rw * pipeio: Add fwts_pipe_readwrite * pipeio: Add fwts_pipe_close2 to cleanup from fwts_open_pipe_rw. * acpi: spcr: add missing debug port types (LP: #1578433) * debian/control: add libfdt-dev and device-tree-compiler * configure.ac: update email address, use fwts-devel instead * fwts: manual: update date, add new contributor, add dtc to SEE ALSO * fwts: manual: ommitted Paul Menzel from the contributions list * lib: fwts_args: handle cases to set optarg_handler for long options. * acpi: dbg2: fix incorrect address size check with GAS struct * data: klog.json: Fix typo in docking label text * acpi: gtdt: fix buffer overrun comparison * acpi: gtdt: fix buffer overrun comparison (for SBSA) * acpi: bert: fix format specifiers for boot error region * lib: fwts_olog: minor fwts coding style reformatting * lib: fwts_olog: fix fclose on already closed files. * lib: fwts_olog: fix memory leak on buffer on error exit path * lib: fwts_olog: ensure buffer is '\0' terminated per read, minor cleanups * lib: fwts_olog: avoid TOCTOU race on stat and fopen * Revert "acpi: tpm2: add check for zero control area address (LP: #1506442)" * apic: apicedge: fix parsing of /proc/interrupts (LP: #1575783) * lib: fwts_pipeio: set *list to NULL on fwts_pipe_read error * cpu: msr: do not check SYSENTER_* MSRs (LP: #1582005) * fwts: lib: clean up static analysis warnings * uefidump: clean up the unnecessary period * pipeio: fix fwts_pipe_read return value when child produces no output * pipeio: Fix error handling in fwts_pipe_exec * pipeio: Rename fwts_pipe_open to fwts_pipe_open_ro, add fd as output argument * pci/aspm: Fix grammar in ASPM advice (LP: #1581988) * bios: mtrr: fix cache type corner case at start of mtrr range * bios: mtrr: fix cache type corner case at end of mtrr range * bios: mtrr: redefine the end point of memory ranges = Detail Changelog = To check /usr/share/doc/fwts/changelog.Debian.gz or fwts_16.05.01-0ubuntu1.debian.tar.gz from https://launchpad.net/ubuntu/+source/fwts -- Cheers, Alex Hung

8 years, 1 month

leg-kernel tag leg-20160517.0 released

by Graeme Gregory

The leg-kernel release has been made and tagged as leg-20160517.0 This is based on mainline kernel v4.6 Repository : http://git.linaro.org/leg/acpi/leg-kernel.git Direct Link: http://git.linaro.org/leg/acpi/leg-kernel.git/commit/80b911a41b69719c867b80… Topic Branches :- http://git.linaro.org/leg/acpi/acpi.git - topic-pci [topic-pci-20160517.0] - topic-numa [topic-numa-20160517.0] - topic-acpi-console [topic-acpi-console-20160517.0] - topic-gtdt-wakeup-timer [topic-gtdt-wakeup-timer-20160617.0] - topic-fvp [topic-fvp-20160517.0] - topic-kvm-acpi [topic-kvm-acpi-20160517.0] - topic-apei [topic-apei-20160517.0] http://git.linaro.org/leg/acpi/leg-kernel.git - leg-configs [leg-configs-20150517.0] NOTES:-

8 years, 1 month

[PATCH] Platforms/ARM: Juno: Update _PRT to provide interrupt type

by Punit Agrawal

The PCI Routing Table (_PRT) for Juno does not specify the Interrupt trigger type and polarity. In the absence of this information, the kernel uses PCI default interrupt type (level triggered, active low) which is incompatible with GICv2 compliant interrupt controller such as on Juno. Absence of interrupt type leads to errors such as following in kernel boot log - [ 1.353696] genirq: Setting trigger mode 8 for irq 9 failed (gic_set_type+0x0/0x5c) [ 1.478286] genirq: Setting trigger mode 8 for irq 17 failed (gic_set_type+0x0/0x5c) [ 1.563723] genirq: Setting trigger mode 8 for irq 18 failed (gic_set_type+0x0/0x5c) Fix this issue by providing the correct information (level triggered, active high) to the kernel by using the PCI Link device. Signed-off-by: Punit Agrawal <punit.agrawal(a)arm.com> --- Hi, This patch to the OpenPlatformPkg for Juno ACPI tables fixes an issue I reported earlier[0]. All feedback welcome. Thanks, Punit [0] https://lists.linaro.org/pipermail/linaro-uefi/2016-April/001776.html Platforms/ARM/Juno/AcpiTables/AcpiSsdtRootPci.asl | 60 +++++++++++++++++------ 1 file changed, 44 insertions(+), 16 deletions(-) diff --git a/Platforms/ARM/Juno/AcpiTables/AcpiSsdtRootPci.asl b/Platforms/ARM/Juno/AcpiTables/AcpiSsdtRootPci.asl index 800d2cb..55b76d6 100644 --- a/Platforms/ARM/Juno/AcpiTables/AcpiSsdtRootPci.asl +++ b/Platforms/ARM/Juno/AcpiTables/AcpiSsdtRootPci.asl @@ -15,20 +15,43 @@ #include "ArmPlatform.h" /* - See Reference [1] 6.2.12 - "There are two ways that _PRT can be used. ... - In the second model, the PCI interrupts are hardwired to specific interrupt - inputs on the interrupt controller and are not configurable. In this case, - the Source field in _PRT does not reference a device, but instead contains - the value zero, and the Source Index field contains the global system - interrupt to which the PCI interrupt is hardwired." + See ACPI 6.1 Section 6.2.13 + + There are two ways that _PRT can be used. ... + + In the first model, a PCI Link device is used to provide additional + configuration information such as whether the interrupt is Level or + Edge triggered, it is active High or Low, Shared or Exclusive, etc. + + In the second model, the PCI interrupts are hardwired to specific + interrupt inputs on the interrupt controller and are not + configurable. In this case, the Source field in _PRT does not + reference a device, but instead contains the value zero, and the + Source Index field contains the global system interrupt to which the + PCI interrupt is hardwired. + + We use the first model with link indirection to set the correct + interrupt type as PCI defaults (Level Triggered, Active Low) are not + compatible with GICv2. */ -#define PRT_ENTRY(Address, Pin, Interrupt) \ - Package (4) { \ +#define LNK_DEVICE(Unique_Id, Link_Name, irq) \ + Device(Link_Name) { \ + Name(_HID, EISAID("PNP0C0F")) \ + Name(_UID, Unique_Id) \ + Name(_PRS, ResourceTemplate() { \ + Interrupt(ResourceProducer, Level, ActiveHigh, Exclusive) { irq } \ + }) \ + Method (_CRS, 0) { Return (_PRS) } \ + Method (_SRS, 1) { } \ + Method (_DIS) { } \ + } + +#define PRT_ENTRY(Address, Pin, Link) \ + Package (4) { \ Address, /* uses the same format as _ADR */ \ Pin, /* The PCI pin number of the device (0-INTA, 1-INTB, 2-INTC, 3-INTD). */ \ - Zero, /* allocated from the global interrupt pool. */ \ - Interrupt /* global system interrupt number */ \ + Link, /* Interrupt allocated via Link device. */ \ + Zero /* global system interrupt number (no used) */ \ } /* @@ -36,7 +59,7 @@ "High word–Device #, Low word–Function #. (for example, device 3, function 2 is 0x00030002). To refer to all the functions on a device #, use a function number of FFFF)." */ -#define ROOT_PRT_ENTRY(Pin, Interrupt) PRT_ENTRY(0x0000FFFF, Pin, Interrupt) +#define ROOT_PRT_ENTRY(Pin, Link) PRT_ENTRY(0x0000FFFF, Pin, Link) // Device 0 for Bridge. @@ -45,6 +68,11 @@ DefinitionBlock("SsdtPci.aml", "SSDT", 1, "ARMLTD", "ARM-JUNO", EFI_ACPI_ARM_OEM // // PCI Root Complex // + LNK_DEVICE(1, LNKA, 168) + LNK_DEVICE(2, LNKB, 169) + LNK_DEVICE(3, LNKC, 170) + LNK_DEVICE(4, LNKD, 171) + Device(PCI0) { Name(_HID, EISAID("PNP0A08")) // PCI Express Root Bridge @@ -60,10 +88,10 @@ DefinitionBlock("SsdtPci.aml", "SSDT", 1, "ARMLTD", "ARM-JUNO", EFI_ACPI_ARM_OEM // PCI Routing Table Name(_PRT, Package() { - ROOT_PRT_ENTRY(0, 168), // INTA - ROOT_PRT_ENTRY(1, 169), // INTB - ROOT_PRT_ENTRY(2, 170), // INTC - ROOT_PRT_ENTRY(3, 171), // INTD + ROOT_PRT_ENTRY(0, LNKA), // INTA + ROOT_PRT_ENTRY(1, LNKB), // INTB + ROOT_PRT_ENTRY(2, LNKC), // INTC + ROOT_PRT_ENTRY(3, LNKD), // INTD }) // Root complex resources Method (_CRS, 0, Serialized) { -- 2.8.0.rc3

8 years, 1 month

[PATCH V6 00/13] Support for generic ACPI based PCI host controller

by Tomasz Nowicki

>From the functionality point of view this series might be split into the following logic parts: 1. Necessary fixes as the preparation for using driver on ARM64. 2. New ECAM API and update for users of the pci-host-common API 3. Use new MCFG interface and implement generic ACPI based PCI host controller driver. 4. Enable above driver on ARM64 Patches has been built on top of 4.6-rc2 and can be found here: git@github.com:semihalf-nowicki-tomasz/linux.git (pci-acpi-v6) This has been tested on Cavium ThunderX server. Any help in reviewing and testing is very appreciated. v5 -> v6 - dropped idea of x86 MMCONFIG code refactoring - integrated JC's patches which introduce new ECAM API: https://lkml.org/lkml/2016/4/11/907 git: https://github.com/jchandra-brcm/linux/ (arm64-acpi-pci-v3) - integrated Sinan's fix for releasing IO resources, see patch [06/13] - added ACPI support for ThunderX ECAM and PEM drivers - rebased to 4.6-rc2 v4 -> v5 - dropped MCFG refactoring group patches 1-6 from series v4 and integrated Jayachandran's patch https://patchwork.ozlabs.org/patch/575525/ - rewrite PCI legacy IRQs allocation - squashed two patches 11 and 12 from series v4, fixed bisection issue - changelog improvements - rebased to 4.5-rc3 v3 -> v4 - dropped Jiang's fix http://lkml.iu.edu/hypermail/linux/kernel/1601.1/04318.html - added Lorenzo's fix patch 19/24 - ACPI PCI bus domain number assigning cleanup - changed resource management, we now claim and reassign resources - improvements for applying quirks - dropped Matthew's http://www.spinics.net/lists/linux-pci/msg45950.html dependency - rebased to 4.5-rc1 v2 -> v3 - fix legacy IRQ assigning and IO ports registration - remove reference to arch specific companion device for ia64 - move ACPI PCI host controller driver to pci_root.c - drop generic domain assignment for x86 and ia64 as I am not able to run all necessary test variants - drop patch which cleaned legacy IRQ assignment since it belongs to Mathew's series: https://patchwork.ozlabs.org/patch/557504/ - extend MCFG quirk code - rebased to 4.4 v1 -> v2 - moved non-arch specific piece of code to dirver/acpi/ directory - fixed IO resource handling - introduced PCI config accessors quirks matching - moved ACPI_COMPANION_SET to generic code v1 - https://lkml.org/lkml/2015/10/27/504 v2 - https://lkml.org/lkml/2015/12/16/246 v3 - http://lkml.iu.edu/hypermail/linux/kernel/1601.1/04308.html v4 - https://lkml.org/lkml/2016/2/4/646 v5 - https://lkml.org/lkml/2016/2/16/426 Jayachandran C (2): PCI: Provide common functions for ECAM mapping PCI: generic, thunder: update to use generic ECAM API Tomasz Nowicki (11): pci, acpi, x86, ia64: Move ACPI host bridge device companion assignment to core code. pci, acpi: Provide generic way to assign bus domain number. x86, ia64: Include acpi_pci_{add|remove}_bus to the default pcibios_{add|remove}_bus implementation. pci, of: Move the PCI I/O space management to PCI core code. acpi, pci: Support IO resources when parsing PCI host bridge resources. arm64, pci, acpi: ACPI support for legacy IRQs parsing and consolidation with DT code. pci, acpi: Support for ACPI based generic PCI host controller arm64, pci, acpi: Start using ACPI based PCI host controller driver for ARM64. pci, acpi: Match PCI config space accessors against platfrom specific quirks. pci, pci-thunder-ecam: Add ACPI support for ThunderX ECAM. pci, pci-thunder-pem: Add ACPI support for ThunderX PEM. arch/arm64/Kconfig | 15 +++ arch/arm64/include/asm/cpufeature.h | 3 +- arch/arm64/kernel/cpu_errata.c | 8 ++ arch/arm64/kernel/pci.c | 35 ++--- arch/ia64/hp/common/sba_iommu.c | 2 +- arch/ia64/include/asm/pci.h | 1 - arch/ia64/pci/pci.c | 26 ---- arch/ia64/sn/kernel/io_acpi_init.c | 4 +- arch/x86/include/asm/pci.h | 3 - arch/x86/pci/acpi.c | 17 --- arch/x86/pci/common.c | 10 -- drivers/acpi/Kconfig | 8 ++ drivers/acpi/Makefile | 1 + drivers/acpi/bus.c | 1 + drivers/acpi/pci_gen_host.c | 259 ++++++++++++++++++++++++++++++++++++ drivers/acpi/pci_root.c | 58 +++++++- drivers/of/address.c | 116 +--------------- drivers/pci/Kconfig | 3 + drivers/pci/Makefile | 2 + drivers/pci/ecam.c | 137 +++++++++++++++++++ drivers/pci/ecam.h | 66 +++++++++ drivers/pci/host/Kconfig | 1 + drivers/pci/host/pci-host-common.c | 119 ++++++++--------- drivers/pci/host/pci-host-common.h | 47 ------- drivers/pci/host/pci-host-generic.c | 52 ++------ drivers/pci/host/pci-thunder-ecam.c | 70 ++++++---- drivers/pci/host/pci-thunder-pem.c | 215 ++++++++++++++++++++++-------- drivers/pci/pci.c | 150 ++++++++++++++++++++- drivers/pci/probe.c | 5 + include/asm-generic/vmlinux.lds.h | 7 + include/linux/of_address.h | 9 -- include/linux/pci-acpi.h | 20 +++ include/linux/pci.h | 12 ++ 33 files changed, 1029 insertions(+), 453 deletions(-) create mode 100644 drivers/acpi/pci_gen_host.c create mode 100644 drivers/pci/ecam.c create mode 100644 drivers/pci/ecam.h delete mode 100644 drivers/pci/host/pci-host-common.h -- 1.9.1

8 years, 1 month

Additional ACPI requirements

by Jon Masters

Hi Folks, There are a few requirements that I would like to ensure are documented in various revised documentation. I'm curious to know whether you'd like the current in-kernel documentation to include things at the level of "GICv3 use requires that every processor have a Processor Device in the DSDT". Is that too much detail for the kernel documentation? Jon. -- Computer Architect | Sent from my Fedora powered laptop

8 years, 1 month

[PATCH] ACPI / CPPC: Add module support for cppc_cpufreq driver

by Ashwin Chaugule

Add a function to cleanup at module exit and export appropriate GPL string to enable moduler support for the cppc_cpufreq driver. Reported-by: Srinivas Pandruvada <srinivas.pandruvada(a)intel.com> Signed-off-by: Ashwin Chaugule <ashwin.chaugule(a)linaro.org> --- drivers/cpufreq/cppc_cpufreq.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/drivers/cpufreq/cppc_cpufreq.c b/drivers/cpufreq/cppc_cpufreq.c index 7c0bdfb..8882b8e 100644 --- a/drivers/cpufreq/cppc_cpufreq.c +++ b/drivers/cpufreq/cppc_cpufreq.c @@ -173,4 +173,25 @@ out: return -ENODEV; } +static void __exit cppc_cpufreq_exit(void) +{ + struct cpudata *cpu; + int i; + + cpufreq_unregister_driver(&cppc_cpufreq_driver); + + for_each_possible_cpu(i) { + cpu = all_cpu_data[i]; + free_cpumask_var(cpu->shared_cpu_map); + kfree(cpu); + } + + kfree(all_cpu_data); +} + +module_exit(cppc_cpufreq_exit); +MODULE_AUTHOR("Ashwin Chaugule"); +MODULE_DESCRIPTION("CPUFreq driver based on the ACPI CPPC v5.0+ spec"); +MODULE_LICENSE("GPL"); + late_initcall(cppc_cpufreq_init); -- 1.9.1

8 years, 1 month

[PATCH v4] ARM64: ACPI: Update documentation for latest specification version

by Al Stone

The ACPI 6.1 specification was recently released at the end of January 2016, but the arm64 kernel documentation for the use of ACPI was written for the 5.1 version of the spec. There were significant additions to the spec that had not yet been mentioned -- for example, the 6.0 mechanisms added to make it easier to define processors and low power idle states, as well as the 6.1 addition allowing regular interrupts (not just from GPIO) be used to signal ACPI general purpose events. This patch reflects going back through and examining the specs in detail and updating content appropriately. Whilst there, a few odds and ends of typos were caught as well. This brings the documentation up to date with ACPI 6.1 for arm64. Changes for v4: -- Clarify that IORT can sometimes be optional (Jon Masters). -- Remove "Use as needed" descriptions of ACPI objects; they provide no substantive information and doing so simplifies maintenance of this document over time. These have been replaced with a simpler notice that states that unless otherwise noted, do what the APCI specification says is needed. -- Corrected the _OSI object usage recommendation; it described kernel behavior that does not exist (Al Stone). Changes for v3: -- Clarify use of _LPI/_RDI (Vikas Sajjan) -- Whitespace cleanup as pointed out by checkpatch Changes for v2: -- Clean up white space (Harb Abdulhahmid) -- Clarification on _CCA usage (Harb Abdulhamid) -- IORT moved to required from recommended (Hanjun Guo) -- Clarify IORT description (Hanjun Guo) Signed-off-by: Al Stone <al.stone(a)linaro.org> Cc: Catalin Marinas <catalin.marinas(a)arm.com> Cc: Will Deacon <will.deacon(a)arm.com> Cc: Jonathan Corbet <corbet(a)lwn.net> --- Documentation/arm64/acpi_object_usage.txt | 347 ++++++++++++++++-------------- Documentation/arm64/arm-acpi.txt | 28 ++- 2 files changed, 212 insertions(+), 163 deletions(-) diff --git a/Documentation/arm64/acpi_object_usage.txt b/Documentation/arm64/acpi_object_usage.txt index a6e1a18..3891750 100644 --- a/Documentation/arm64/acpi_object_usage.txt +++ b/Documentation/arm64/acpi_object_usage.txt @@ -13,14 +13,18 @@ For ACPI on arm64, tables also fall into the following categories: -- Required: DSDT, FADT, GTDT, MADT, MCFG, RSDP, SPCR, XSDT - -- Recommended: BERT, EINJ, ERST, HEST, SSDT + -- Recommended: BERT, EINJ, ERST, HEST, PCCT, SSDT - -- Optional: BGRT, CPEP, CSRT, DRTM, ECDT, FACS, FPDT, MCHI, MPST, - MSCT, RASF, SBST, SLIT, SPMI, SRAT, TCPA, TPM2, UEFI + -- Optional: BGRT, CPEP, CSRT, DBG2, DRTM, ECDT, FACS, FPDT, MCHI, + MPST, MSCT, NFIT, PMTT, RASF, SBST, SLIT, SPMI, SRAT, STAO, TCPA, + TPM2, UEFI, XENV - -- Not supported: BOOT, DBG2, DBGP, DMAR, ETDT, HPET, IBFT, IVRS, - LPIT, MSDM, RSDT, SLIC, WAET, WDAT, WDRT, WPBT + -- Not supported: BOOT, DBGP, DMAR, ETDT, HPET, IBFT, IVRS, LPIT, + MSDM, OEMx, PSDT, RSDT, SLIC, WAET, WDAT, WDRT, WPBT + -- NB: the IORT is required on certain SBSA platforms (e.g., when + using GICv3-ITS and an SMMU); it is optional on SBSA Level 0 + platforms. Table Usage for ARMv8 Linux ----- ---------------------------------------------------------------- @@ -50,7 +54,8 @@ CSRT Signature Reserved (signature == "CSRT") DBG2 Signature Reserved (signature == "DBG2") == DeBuG port table 2 == - Microsoft only table, will not be supported. + License has changed and should be usable. Optional if used instead + of earlycon=<device> on the command line. DBGP Signature Reserved (signature == "DBGP") == DeBuG Port table == @@ -133,10 +138,11 @@ GTDT Section 5.2.24 (signature == "GTDT") HEST Section 18.3.2 (signature == "HEST") == Hardware Error Source Table == - Until further error source types are defined, use only types 6 (AER - Root Port), 7 (AER Endpoint), 8 (AER Bridge), or 9 (Generic Hardware - Error Source). Firmware first error handling is possible if and only - if Trusted Firmware is being used on arm64. + ARM-specific error sources have been defined; please use those or the + PCI types such as type 6 (AER Root Port), 7 (AER Endpoint), or 8 (AER + Bridge), or use type 9 (Generic Hardware Error Source). Firmware first + error handling is possible if and only if Trusted Firmware is being + used on arm64. Must be supplied if RAS support is provided by the platform. It is recommended this table be supplied. @@ -149,20 +155,30 @@ IBFT Signature Reserved (signature == "IBFT") == iSCSI Boot Firmware Table == Microsoft defined table, support TBD. +IORT Signature Reserved (signature == "IORT") + == Input Output Remapping Table == + arm64 only table, required in order to describe IO topology, SMMUs, + and GIC ITSs, and how those various components are connected together, + such as identifying which components are behind which SMMUs/ITSs. + This table will only be required on certain SBSA platforms (e.g., + when using GICv3-ITS and an SMMU); on SBSA Level 0 platforms, it + remains optional. + IVRS Signature Reserved (signature == "IVRS") == I/O Virtualization Reporting Structure == x86_64 (AMD) only table, will not be supported. LPIT Signature Reserved (signature == "LPIT") == Low Power Idle Table == - x86 only table as of ACPI 5.1; future versions have been adapted for - use with ARM and will be recommended in order to support ACPI power - management. + x86 only table as of ACPI 5.1; starting with ACPI 6.0, processor + descriptions and power states on ARM platforms should use the DSDT + and define processor container devices (_HID ACPI0010, Section 8.4, + and more specifically 8.4.3 and and 8.4.4). MADT Section 5.2.12 (signature == "APIC") == Multiple APIC Description Table == Required for arm64. Only the GIC interrupt controller structures - should be used (types 0xA - 0xE). + should be used (types 0xA - 0xF). MCFG Signature Reserved (signature == "MCFG") == Memory-mapped ConFiGuration space == @@ -176,14 +192,38 @@ MPST Section 5.2.21 (signature == "MPST") == Memory Power State Table == Optional, not currently supported. +MSCT Section 5.2.19 (signature == "MSCT") + == Maximum System Characteristic Table == + Optional, not currently supported. + MSDM Signature Reserved (signature == "MSDM") == Microsoft Data Management table == Microsoft only table, will not be supported. -MSCT Section 5.2.19 (signature == "MSCT") - == Maximum System Characteristic Table == +NFIT Section 5.2.25 (signature == "NFIT") + == NVDIMM Firmware Interface Table == Optional, not currently supported. +OEMx Signature of "OEMx" only + == OEM Specific Tables == + All tables starting with a signature of "OEM" are reserved for OEM + use. Since these are not meant to be of general use but are limited + to very specific end users, they are not recommended for use and are + not supported by the kernel for arm64. + +PCCT Section 14.1 (signature == "PCCT) + == Platform Communications Channel Table == + Recommend for use on arm64, and required when using CPPC to control + power on the platform. + +PMTT Section 5.2.21.12 (signature == "PMTT") + == Platform Memory Topology Table == + Optional, but useful, but not currently supported. + +PSDT Section 5.2.11.3 (signature == "PSDT") + == Persistent System Description Table == + Obsolete table, will not be supported. + RASF Section 5.2.20 (signature == "RASF") == RAS Feature table == Optional, not currently supported. @@ -195,7 +235,7 @@ RSDP Section 5.2.5 (signature == "RSD PTR") RSDT Section 5.2.7 (signature == "RSDT") == Root System Description Table == Since this table can only provide 32-bit addresses, it is deprecated - on arm64, and will not be used. + on arm64, and will not be used. If provided, it will be ignored. SBST Section 5.2.14 (signature == "SBST") == Smart Battery Subsystem Table == @@ -207,7 +247,7 @@ SLIC Signature Reserved (signature == "SLIC") SLIT Section 5.2.17 (signature == "SLIT") == System Locality distance Information Table == - Optional in general, but required for NUMA systems. + Optional in general, but required for arm64 NUMA systems. SPCR Signature Reserved (signature == "SPCR") == Serial Port Console Redirection table == @@ -220,7 +260,7 @@ SPMI Signature Reserved (signature == "SPMI") SRAT Section 5.2.16 (signature == "SRAT") == System Resource Affinity Table == Optional, but if used, only the GICC Affinity structures are read. - To support NUMA, this table is required. + To support arm64 NUMA, this table is required. SSDT Section 5.2.11.2 (signature == "SSDT") == Secondary System Description Table == @@ -235,6 +275,11 @@ SSDT Section 5.2.11.2 (signature == "SSDT") These tables are optional, however. ACPI tables should contain only one DSDT but can contain many SSDTs. +STAO Signature Reserved (signature == "STAO") + == _STA Override table == + Optional, but only necessary in virtualized environments in order to + hide devices from guest OSs. + TCPA Signature Reserved (signature == "TCPA") == Trusted Computing Platform Alliance table == Optional, not currently supported, and may need changes to fully @@ -266,6 +311,10 @@ WPBT Signature Reserved (signature == "WPBT") == Windows Platform Binary Table == Microsoft only table, will not be supported. +XENV Signature Reserved (signature == "XENV") + == Xen project table == + Optional, used only by Xen at present. + XSDT Section 5.2.8 (signature == "XSDT") == eXtended System Description Table == Required for arm64. @@ -273,44 +322,46 @@ XSDT Section 5.2.8 (signature == "XSDT") ACPI Objects ------------ -The expectations on individual ACPI objects are discussed in the list that -follows: +The expectations on individual ACPI objects that are likely to be used are +shown in the list that follows; any object not explicitly mentioned below +should be used as needed for a particular platform or particular subsystem, +such as power management or PCI. Name Section Usage for ARMv8 Linux ---- ------------ ------------------------------------------------- -_ADR 6.1.1 Use as needed. +_CCA 6.2.17 This method must be defined for all bus masters + on arm64 -- there are no assumptions made about + whether such devices are cache coherent or not. + The _CCA value is inherited by all descendants of + these devices so it does not need to be repeated. + Without _CCA on arm64, the kernel does not know what + to do about setting up DMA for the device. -_BBN 6.5.5 Use as needed; PCI-specific. + NB: this method provides default cache coherency + attributes; the presence of an SMMU can be used to + modify that, however. For example, a master could + default to non-coherent, but be made coherent with + the appropriate SMMU configuration (see Table 17 of + the IORT specification, ARM Document DEN 0049B). -_BDN 6.5.3 Optional; not likely to be used on arm64. +_CID 6.1.2 Use as needed, see also _HID. -_CCA 6.2.17 This method should be defined for all bus masters - on arm64. While cache coherency is assumed, making - it explicit ensures the kernel will set up DMA as - it should. +_CLS 6.1.3 Use as needed, see also _HID. -_CDM 6.2.1 Optional, to be used only for processor devices. - -_CID 6.1.2 Use as needed. - -_CLS 6.1.3 Use as needed. +_CPC 8.4.7.1 Use as needed, power management specific. CPPC is + recommended on arm64. _CRS 6.2.2 Required on arm64. -_DCK 6.5.2 Optional; not likely to be used on arm64. +_CSD 8.4.2.2 Use as needed, used only in conjunction with _CST. + +_CST 8.4.2.1 Low power idle states (8.4.4) are recommended instead + of C-states. _DDN 6.1.4 This field can be used for a device name. However, it is meant for DOS device names (e.g., COM1), so be careful of its use across OSes. -_DEP 6.5.8 Use as needed. - -_DIS 6.2.3 Optional, for power management use. - -_DLM 5.7.5 Optional. - -_DMA 6.2.4 Optional. - _DSD 6.2.5 To be used with caution. If this object is used, try to use it within the constraints already defined by the Device Properties UUID. Only in rare circumstances @@ -325,20 +376,10 @@ _DSD 6.2.5 To be used with caution. If this object is used, try with the UEFI Forum; this may cause some iteration as more than one OS will be registering entries. -_DSM Do not use this method. It is not standardized, the +_DSM 9.1.1 Do not use this method. It is not standardized, the return values are not well documented, and it is currently a frequent source of error. -_DSW 7.2.1 Use as needed; power management specific. - -_EDL 6.3.1 Optional. - -_EJD 6.3.2 Optional. - -_EJx 6.3.3 Optional. - -_FIX 6.2.7 x86 specific, not used on arm64. - \_GL 5.7.1 This object is not to be used in hardware reduced mode, and therefore should not be used on arm64. @@ -349,35 +390,25 @@ _GLK 6.5.7 This object requires a global lock be defined; there \_GPE 5.3.1 This namespace is for x86 use only. Do not use it on arm64. -_GSB 6.2.7 Optional. - -_HID 6.1.5 Use as needed. This is the primary object to use in - device probing, though _CID and _CLS may also be used. - -_HPP 6.2.8 Optional, PCI specific. +_HID 6.1.5 This is the primary object to use in device probing, + though _CID and _CLS may also be used. -_HPX 6.2.9 Optional, PCI specific. - -_HRV 6.1.6 Optional, use as needed to clarify device behavior; in - some cases, this may be easier to use than _DSD. +_HRV 6.1.6 Use to clarify device behavior; in some cases, this + may be easier to use than _DSD. _INI 6.5.1 Not required, but can be useful in setting up devices when UEFI leaves them in a state that may not be what the driver expects before it starts probing. -_IRC 7.2.15 Use as needed; power management specific. - -_LCK 6.3.4 Optional. +_LPI 8.4.4.3 Recommended for use with processor definitions (_HID + ACPI0010) on arm64. See also _RDI. -_MAT 6.2.10 Optional; see also the MADT. +_MLS 6.1.7 Highly recommended for use in internationalization. -_MLS 6.1.7 Optional, but highly recommended for use in - internationalization. - -_OFF 7.1.2 It is recommended to define this method for any device +_OFF 7.2.2 It is recommended to define this method for any device that can be turned on or off. -_ON 7.1.3 It is recommended to define this method for any device +_ON 7.2.3 It is recommended to define this method for any device that can be turned on or off. \_OS 5.7.3 This method will return "Linux" by default (this is @@ -398,122 +429,106 @@ _OSC 6.2.11 This method can be a global method in ACPI (i.e., by the kernel community, then register it with the UEFI Forum. -\_OSI 5.7.2 Deprecated on ARM64. Any invocation of this method - will print a warning on the console and return false. - That is, as far as ACPI firmware is concerned, _OSI - cannot be used to determine what sort of system is - being used or what functionality is provided. The - _OSC method is to be used instead. - -_OST 6.3.5 Optional. +\_OSI 5.7.2 Deprecated on ARM64. As far as ACPI firmware is + concerned, _OSI is not to be used to determine what + sort of system is being used or what functionality + is provided. The _OSC method is to be used instead. _PDC 8.4.1 Deprecated, do not use on arm64. \_PIC 5.8.1 The method should not be used. On arm64, the only interrupt model available is GIC. -_PLD 6.1.8 Optional. - \_PR 5.3.1 This namespace is for x86 use only on legacy systems. Do not use it on arm64. -_PRS 6.2.12 Optional. - _PRT 6.2.13 Required as part of the definition of all PCI root devices. -_PRW 7.2.13 Use as needed; power management specific. - -_PRx 7.2.8-11 Use as needed; power management specific. If _PR0 is +_PRx 7.3.8-11 Use as needed; power management specific. If _PR0 is defined, _PR3 must also be defined. -_PSC 7.2.6 Use as needed; power management specific. - -_PSE 7.2.7 Use as needed; power management specific. - -_PSW 7.2.14 Use as needed; power management specific. - -_PSx 7.2.2-5 Use as needed; power management specific. If _PS0 is +_PSx 7.3.2-5 Use as needed; power management specific. If _PS0 is defined, _PS3 must also be defined. If clocks or regulators need adjusting to be consistent with power usage, change them in these methods. -\_PTS 7.3.1 Use as needed; power management specific. - -_PXM 6.2.14 Optional. - -_REG 6.5.4 Use as needed. +_RDI 8.4.4.4 Recommended for use with processor definitions (_HID + ACPI0010) on arm64. This should only be used in + conjunction with _LPI. \_REV 5.7.4 Always returns the latest version of ACPI supported. -_RMV 6.3.6 Optional. - \_SB 5.3.1 Required on arm64; all devices must be defined in this namespace. -_SEG 6.5.6 Use as needed; PCI-specific. - -\_SI 5.3.1, Optional. - 9.1 - -_SLI 6.2.15 Optional; recommended when SLIT table is in use. +_SLI 6.2.15 Use is recommended when SLIT table is in use. _STA 6.3.7, It is recommended to define this method for any device - 7.1.4 that can be turned on or off. + 7.2.4 that can be turned on or off. See also the STAO table + that provides overrides to hide devices in virtualized + environments. -_SRS 6.2.16 Optional; see also _PRS. +_SRS 6.2.16 Use as needed; see also _PRS. _STR 6.1.10 Recommended for conveying device names to end users; this is preferred over using _DDN. _SUB 6.1.9 Use as needed; _HID or _CID are preferred. -_SUN 6.1.11 Optional. +_SUN 6.1.11 Use as needed, but recommended. -\_Sx 7.3.2 Use as needed; power management specific. - -_SxD 7.2.16-19 Use as needed; power management specific. - -_SxW 7.2.20-24 Use as needed; power management specific. - -_SWS 7.3.3 Use as needed; power management specific; this may +_SWS 7.4.3 Use as needed; power management specific; this may require specification changes for use on arm64. -\_TTS 7.3.4 Use as needed; power management specific. - -\_TZ 5.3.1 Optional. - _UID 6.1.12 Recommended for distinguishing devices of the same class; define it if at all possible. -\_WAK 7.3.5 Use as needed; power management specific. + ACPI Event Model ---------------- Do not use GPE block devices; these are not supported in the hardware reduced profile used by arm64. Since there are no GPE blocks defined for use on ARM -platforms, GPIO-signaled interrupts should be used for creating system events. +platforms, ACPI events must be signaled differently. + +There are two options: GPIO-signaled interrupts (Section 5.6.5), and +interrupt-signaled events (Section 5.6.9). Interrupt-signaled events are a +new feature in the ACPI 6.1 specification. Either -- or both -- can be used +on a given platform, and which to use may be dependent of limitations in any +given SoC. If possible, interrupt-signaled events are recommended. ACPI Processor Control ---------------------- -Section 8 of the ACPI specification is currently undergoing change that -should be completed in the 6.0 version of the specification. Processor -performance control will be handled differently for arm64 at that point -in time. Processor aggregator devices (section 8.5) will not be used, -for example, but another similar mechanism instead. - -While UEFI constrains what we can say until the release of 6.0, it is -recommended that CPPC (8.4.5) be used as the primary model. This will -still be useful into the future. C-states and P-states will still be -provided, but most of the current design work appears to favor CPPC. +Section 8 of the ACPI specification changed significantly in version 6.0. +Processors should now be defined as Device objects with _HID ACPI0007; do +not use the deprecated Processor statement in ASL. All multiprocessor systems +should also define a hierarchy of processors, done with Processor Container +Devices (see Section 8.4.3.1, _HID ACPI0010); do not use processor aggregator +devices (Section 8.5) to describe processor topology. Section 8.4 of the +specification describes the semantics of these object definitions and how +they interrelate. + +Most importantly, the processor hierarchy defined also defines the low power +idle states that are available to the platform, along with the rules for +determining which processors can be turned on or off and the circumstances +that control that. Without this information, the processors will run in +whatever power state they were left in by UEFI. + +Note too, that the processor Device objects defined and the entries in the +MADT for GICs are expected to be in sychronization. The _UID of the Device +object must correspond to processor IDs used in the MADT. + +It is recommended that CPPC (8.4.5) be used as the primary model for processor +performance control on arm64. C-states and P-states may become available at +some point in the future, but most current design work appears to favor CPPC. Further, it is essential that the ARMv8 SoC provide a fully functional implementation of PSCI; this will be the only mechanism supported by ACPI -to control CPU power state (including secondary CPU booting). - -More details will be provided on the release of the ACPI 6.0 specification. +to control CPU power state. Booting of secondary CPUs may be possible using +parking protocol, but only PSCI is to be used for ARM servers. ACPI System Address Map Interfaces @@ -535,21 +550,25 @@ used to indicate fatal errors that cannot be corrected, and require immediate attention. Since there is no direct equivalent of the x86 SCI or NMI, arm64 handles -these slightly differently. The SCI is handled as a normal GPIO-signaled -interrupt; given that these are corrected (or correctable) errors being -reported, this is sufficient. The NMI is emulated as the highest priority -GPIO-signaled interrupt possible. This implies some caution must be used -since there could be interrupts at higher privilege levels or even interrupts -at the same priority as the emulated NMI. In Linux, this should not be the -case but one should be aware it could happen. +these slightly differently. The SCI is handled as a high priority interrupt; +given that these are corrected (or correctable) errors being reported, this +is sufficient. The NMI is emulated as the highest priority interrupt +possible. This implies some caution must be used since there could be +interrupts at higher privilege levels or even interrupts at the same priority +as the emulated NMI. In Linux, this should not be the case but one should +be aware it could happen. ACPI Objects Not Supported on ARM64 ----------------------------------- While this may change in the future, there are several classes of objects that can be defined, but are not currently of general interest to ARM servers. +Some of these objects have x86 equivalents, and may actually make sense in ARM +servers. However, there is either no hardware available at present, or there +may not even be a non-ARM implementation yet. Hence, they are not currently +supported. -These are not supported: +The following classes of objects are not supported: -- Section 9.2: ambient light sensor devices @@ -571,16 +590,6 @@ These are not supported: -- Section 9.18: time and alarm devices (see 9.15) - -ACPI Objects Not Yet Implemented --------------------------------- -While these objects have x86 equivalents, and they do make some sense in ARM -servers, there is either no hardware available at present, or in some cases -there may not yet be a non-ARM implementation. Hence, they are currently not -implemented though that may change in the future. - -Not yet implemented are: - -- Section 10: power source and power meter devices -- Section 11: thermal management @@ -589,5 +598,31 @@ Not yet implemented are: -- Section 13: SMBus interfaces - -- Section 17: NUMA support (prototypes have been submitted for - review) + +This also mean that there is no support for the following objects: + +Name Section Name Section +---- ------------ ---- ------------ +_ALC 9.3.4 _FDM 9.10.3 +_ALI 9.3.2 _FIX 6.2.7 +_ALP 9.3.6 _GAI 10.4.5 +_ALR 9.3.5 _GHL 10.4.7 +_ALT 9.3.3 _GTM 9.9.2.1.1 +_BCT 10.2.2.10 _LID 9.5.1 +_BDN 6.5.3 _PAI 10.4.4 +_BIF 10.2.2.1 _PCL 10.3.2 +_BIX 10.2.2.1 _PIF 10.3.3 +_BLT 9.2.3 _PMC 10.4.1 +_BMA 10.2.2.4 _PMD 10.4.8 +_BMC 10.2.2.12 _PMM 10.4.3 +_BMD 10.2.2.11 _PRL 10.3.4 +_BMS 10.2.2.5 _PSR 10.3.1 +_BST 10.2.2.6 _PTP 10.4.2 +_BTH 10.2.2.7 _SBS 10.1.3 +_BTM 10.2.2.9 _SHL 10.4.6 +_BTP 10.2.2.8 _STM 9.9.2.1.1 +_DCK 6.5.2 _UPD 9.16.1 +_EC 12.12 _UPP 9.16.2 +_FDE 9.10.1 _WPC 10.5.2 +_FDI 9.10.2 _WPP 10.5.3 + diff --git a/Documentation/arm64/arm-acpi.txt b/Documentation/arm64/arm-acpi.txt index 570a4f8..12381c1 100644 --- a/Documentation/arm64/arm-acpi.txt +++ b/Documentation/arm64/arm-acpi.txt @@ -57,11 +57,11 @@ The short form of the rationale for ACPI on ARM is: -- The new ACPI governance process works well and Linux is now at the same table as hardware vendors and other OS vendors. In fact, there is no - longer any reason to feel that ACPI is only belongs to Windows or that + longer any reason to feel that ACPI only belongs to Windows or that Linux is in any way secondary to Microsoft in this arena. The move of ACPI governance into the UEFI forum has significantly opened up the specification development process, and currently, a large portion of the - changes being made to ACPI is being driven by Linux. + changes being made to ACPI are being driven by Linux. Key to the use of ACPI is the support model. For servers in general, the responsibility for hardware behaviour cannot solely be the domain of the @@ -159,7 +159,7 @@ Further, the ACPI core will only use the 64-bit address fields in the FADT (Fixed ACPI Description Table). Any 32-bit address fields in the FADT will be ignored on arm64. -Hardware reduced mode (see Section 4.1 of the ACPI 5.1 specification) will +Hardware reduced mode (see Section 4.1 of the ACPI 6.1 specification) will be enforced by the ACPI core on arm64. Doing so allows the ACPI core to run less complex code since it no longer has to provide support for legacy hardware from other architectures. Any fields that are not to be used for @@ -167,7 +167,7 @@ hardware reduced mode must be set to zero. For the ACPI core to operate properly, and in turn provide the information the kernel needs to configure devices, it expects to find the following -tables (all section numbers refer to the ACPI 5.1 specfication): +tables (all section numbers refer to the ACPI 6.1 specfication): -- RSDP (Root System Description Pointer), section 5.2.5 @@ -185,9 +185,22 @@ tables (all section numbers refer to the ACPI 5.1 specfication): -- If PCI is supported, the MCFG (Memory mapped ConFiGuration Table), section 5.2.6, specifically Table 5-31. + -- If booting without a console=<device> kernel parameter is + supported, the SPCR (Serial Port Console Redirection table), + section 5.2.6, specifically Table 5-31. + + -- If virtualization is supported, the IORT (Input Output Remapping + Table, section 5.2.6, specifically Table 5-31. + + -- If NUMA is supported, the SRAT (System Resource Affinity Table) + and SLIT (System Locality distance Information Table), sections + 5.2.16 and 5.2.17, respectively. + If the above tables are not all present, the kernel may or may not be able to boot properly since it may not be able to configure all of the -devices available. +devices available. This list of tables is not meant to be all inclusive; +in some environments other tables may be needed (e.g., any of the APEI +tables from section 18) to support specific functionality. ACPI Detection @@ -233,7 +246,7 @@ that looks like this: Name(KEY0, "value0"). An ACPI device driver would then retrieve the value of the property by evaluating the KEY0 object. However, using Name() this way has multiple problems: (1) ACPI limits names ("KEY0") to four characters unlike DT; (2) there is no industry -wide registry that maintains a list of names, minimzing re-use; (3) +wide registry that maintains a list of names, minimizing re-use; (3) there is also no registry for the definition of property values ("value0"), again making re-use difficult; and (4) how does one maintain backward compatibility as new hardware comes out? The _DSD method was created @@ -434,7 +447,8 @@ The ACPI specification changes regularly. During the year 2014, for instance, version 5.1 was released and version 6.0 substantially completed, with most of the changes being driven by ARM-specific requirements. Proposed changes are presented and discussed in the ASWG (ACPI Specification Working Group) which -is a part of the UEFI Forum. +is a part of the UEFI Forum. The current version of the ACPI specification +is 6.1 release in January 2016. Participation in this group is open to all UEFI members. Please see http://www.uefi.org/workinggroup for details on group membership. -- 2.5.5

8 years, 1 month

[PATCH v3] ARM64: ACPI: Update documentation for latest specification version

by Al Stone

The ACPI 6.1 specification was recently released at the end of January 2016, but the arm64 kernel documentation for the use of ACPI was written for the 5.1 version of the spec. There were significant additions to the spec that had not yet been mentioned -- for example, the 6.0 mechanisms added to make it easier to define processors and low power idle states, as well as the 6.1 addition allowing regular interrupts (not just from GPIO) be used to signal ACPI general purpose events. This patch reflects going back through and examining the specs in detail and updating content appropriately. Whilst there, a few odds and ends of typos were caught as well. This brings the documentation up to date with ACPI 6.1 for arm64. Changes for v3: -- Clarify use of _LPI/_RDI (Vikas Sajjan) -- Whitespace cleanup as pointed out by checkpatch Changes for v2: -- Clean up white space (Harb Abdulhahmid) -- Clarification on _CCA usage (Harb Abdulhamid) -- IORT moved to required from recommended (Hanjun Guo) -- Clarify IORT description (Hanjun Guo) Signed-off-by: Al Stone <al.stone(a)linaro.org> Cc: Catalin Marinas <catalin.marinas(a)arm.com> Cc: Will Deacon <will.deacon(a)arm.com> Cc: Jonathan Corbet <corbet(a)lwn.net> --- Documentation/arm64/acpi_object_usage.txt | 446 ++++++++++++++++++++++-------- Documentation/arm64/arm-acpi.txt | 28 +- 2 files changed, 357 insertions(+), 117 deletions(-) diff --git a/Documentation/arm64/acpi_object_usage.txt b/Documentation/arm64/acpi_object_usage.txt index a6e1a18..756d2f8 100644 --- a/Documentation/arm64/acpi_object_usage.txt +++ b/Documentation/arm64/acpi_object_usage.txt @@ -11,15 +11,16 @@ outside of the UEFI Forum (see Section 5.2.6 of the specification). For ACPI on arm64, tables also fall into the following categories: - -- Required: DSDT, FADT, GTDT, MADT, MCFG, RSDP, SPCR, XSDT + -- Required: DSDT, FADT, GTDT, IORT, MADT, MCFG, RSDP, SPCR, XSDT - -- Recommended: BERT, EINJ, ERST, HEST, SSDT + -- Recommended: BERT, EINJ, ERST, HEST, PCCT, SSDT - -- Optional: BGRT, CPEP, CSRT, DRTM, ECDT, FACS, FPDT, MCHI, MPST, - MSCT, RASF, SBST, SLIT, SPMI, SRAT, TCPA, TPM2, UEFI + -- Optional: BGRT, CPEP, CSRT, DBG2, DRTM, ECDT, FACS, FPDT, MCHI, + MPST, MSCT, NFIT, PMTT, RASF, SBST, SLIT, SPMI, SRAT, STAO, TCPA, + TPM2, UEFI, XENV - -- Not supported: BOOT, DBG2, DBGP, DMAR, ETDT, HPET, IBFT, IVRS, - LPIT, MSDM, RSDT, SLIC, WAET, WDAT, WDRT, WPBT + -- Not supported: BOOT, DBGP, DMAR, ETDT, HPET, IBFT, IVRS, LPIT, + MSDM, OEMx, PSDT, RSDT, SLIC, WAET, WDAT, WDRT, WPBT Table Usage for ARMv8 Linux @@ -50,7 +51,8 @@ CSRT Signature Reserved (signature == "CSRT") DBG2 Signature Reserved (signature == "DBG2") == DeBuG port table 2 == - Microsoft only table, will not be supported. + License has changed and should be usable. Optional if used instead + of earlycon=<device> on the command line. DBGP Signature Reserved (signature == "DBGP") == DeBuG Port table == @@ -133,10 +135,11 @@ GTDT Section 5.2.24 (signature == "GTDT") HEST Section 18.3.2 (signature == "HEST") == Hardware Error Source Table == - Until further error source types are defined, use only types 6 (AER - Root Port), 7 (AER Endpoint), 8 (AER Bridge), or 9 (Generic Hardware - Error Source). Firmware first error handling is possible if and only - if Trusted Firmware is being used on arm64. + ARM-specific error sources have been defined; please use those or the + PCI types such as type 6 (AER Root Port), 7 (AER Endpoint), or 8 (AER + Bridge), or use type 9 (Generic Hardware Error Source). Firmware first + error handling is possible if and only if Trusted Firmware is being + used on arm64. Must be supplied if RAS support is provided by the platform. It is recommended this table be supplied. @@ -149,20 +152,27 @@ IBFT Signature Reserved (signature == "IBFT") == iSCSI Boot Firmware Table == Microsoft defined table, support TBD. +IORT Signature Reserved (signature == "IORT") + == Input Output Remapping Table == + arm64 only table, required in order to describe IO topology, SMMUs, + and GIC ITSs, and how those various components are connected together, + such as identifying which components are behind which SMMUs/ITSs. + IVRS Signature Reserved (signature == "IVRS") == I/O Virtualization Reporting Structure == x86_64 (AMD) only table, will not be supported. LPIT Signature Reserved (signature == "LPIT") == Low Power Idle Table == - x86 only table as of ACPI 5.1; future versions have been adapted for - use with ARM and will be recommended in order to support ACPI power - management. + x86 only table as of ACPI 5.1; starting with ACPI 6.0, processor + descriptions and power states on ARM platforms should use the DSDT + and define processor container devices (_HID ACPI0010, Section 8.4, + and more specifically 8.4.3 and and 8.4.4). MADT Section 5.2.12 (signature == "APIC") == Multiple APIC Description Table == Required for arm64. Only the GIC interrupt controller structures - should be used (types 0xA - 0xE). + should be used (types 0xA - 0xF). MCFG Signature Reserved (signature == "MCFG") == Memory-mapped ConFiGuration space == @@ -176,14 +186,38 @@ MPST Section 5.2.21 (signature == "MPST") == Memory Power State Table == Optional, not currently supported. +MSCT Section 5.2.19 (signature == "MSCT") + == Maximum System Characteristic Table == + Optional, not currently supported. + MSDM Signature Reserved (signature == "MSDM") == Microsoft Data Management table == Microsoft only table, will not be supported. -MSCT Section 5.2.19 (signature == "MSCT") - == Maximum System Characteristic Table == +NFIT Section 5.2.25 (signature == "NFIT") + == NVDIMM Firmware Interface Table == Optional, not currently supported. +OEMx Signature of "OEMx" only + == OEM Specific Tables == + All tables starting with a signature of "OEM" are reserved for OEM + use. Since these are not meant to be of general use but are limited + to very specific end users, they are not recommended for use and are + not supported by the kernel for arm64. + +PCCT Section 14.1 (signature == "PCCT) + == Platform Communications Channel Table == + Recommend for use on arm64, and required when using CPPC to control + power on the platform. + +PMTT Section 5.2.21.12 (signature == "PMTT") + == Platform Memory Topology Table == + Optional, but useful, but not currently supported. + +PSDT Section 5.2.11.3 (signature == "PSDT") + == Persistent System Description Table == + Obsolete table, will not be supported. + RASF Section 5.2.20 (signature == "RASF") == RAS Feature table == Optional, not currently supported. @@ -195,7 +229,7 @@ RSDP Section 5.2.5 (signature == "RSD PTR") RSDT Section 5.2.7 (signature == "RSDT") == Root System Description Table == Since this table can only provide 32-bit addresses, it is deprecated - on arm64, and will not be used. + on arm64, and will not be used. If provided, it will be ignored. SBST Section 5.2.14 (signature == "SBST") == Smart Battery Subsystem Table == @@ -207,7 +241,7 @@ SLIC Signature Reserved (signature == "SLIC") SLIT Section 5.2.17 (signature == "SLIT") == System Locality distance Information Table == - Optional in general, but required for NUMA systems. + Optional in general, but required for arm64 NUMA systems. SPCR Signature Reserved (signature == "SPCR") == Serial Port Console Redirection table == @@ -220,7 +254,7 @@ SPMI Signature Reserved (signature == "SPMI") SRAT Section 5.2.16 (signature == "SRAT") == System Resource Affinity Table == Optional, but if used, only the GICC Affinity structures are read. - To support NUMA, this table is required. + To support arm64 NUMA, this table is required. SSDT Section 5.2.11.2 (signature == "SSDT") == Secondary System Description Table == @@ -235,6 +269,11 @@ SSDT Section 5.2.11.2 (signature == "SSDT") These tables are optional, however. ACPI tables should contain only one DSDT but can contain many SSDTs. +STAO Signature Reserved (signature == "STAO") + == _STA Override table == + Optional, but only necessary in virtualized environments in order to + hide devices from guest OSs. + TCPA Signature Reserved (signature == "TCPA") == Trusted Computing Platform Alliance table == Optional, not currently supported, and may need changes to fully @@ -266,6 +305,10 @@ WPBT Signature Reserved (signature == "WPBT") == Windows Platform Binary Table == Microsoft only table, will not be supported. +XENV Signature Reserved (signature == "XENV") + == Xen project table == + Optional, used only by Xen at present. + XSDT Section 5.2.8 (signature == "XSDT") == eXtended System Description Table == Required for arm64. @@ -273,31 +316,57 @@ XSDT Section 5.2.8 (signature == "XSDT") ACPI Objects ------------ -The expectations on individual ACPI objects are discussed in the list that -follows: +The expectations on individual ACPI objects that are likely to be used are +shown in the list that follows: Name Section Usage for ARMv8 Linux ---- ------------ ------------------------------------------------- +_ACx 11.4.1 Use as needed. + _ADR 6.1.1 Use as needed. +_ALx 11.4.2 Use as needed. + +_ART 11.4.3 Use as needed. + _BBN 6.5.5 Use as needed; PCI-specific. -_BDN 6.5.3 Optional; not likely to be used on arm64. +_CCA 6.2.17 This method must be defined for all bus masters + on arm64 -- there are no assumptions made about + whether such devices are cache coherent or not. + The _CCA value is inherited by all descendants of + these devices so it does not need to be repeated. + Without _CCA on arm64, the kernel does not know what + to do about setting up DMA for the device. -_CCA 6.2.17 This method should be defined for all bus masters - on arm64. While cache coherency is assumed, making - it explicit ensures the kernel will set up DMA as - it should. + NB: this method provides default cache coherency + attributes; the presence of an SMMU can be used to + modify that, however. For example, a master could + default to non-coherent, but be made coherent with + the appropriate SMMU configuration (see Table 17 of + the IORT specification, ARM Document DEN 0049B). -_CDM 6.2.1 Optional, to be used only for processor devices. +_CDM 6.2.1 Use as needed, to be used only for processor devices. -_CID 6.1.2 Use as needed. +_CID 6.1.2 Use as needed, see also _HID. -_CLS 6.1.3 Use as needed. +_CLS 6.1.3 Use as needed, see also _HID. + +_CPC 8.4.7.1 Use as needed; power management specific. CPPC is + recommended on arm64. + +_CR3 11.4.5 Use as needed. _CRS 6.2.2 Required on arm64. -_DCK 6.5.2 Optional; not likely to be used on arm64. +_CRT 11.4.4 Use as needed. + +_CSD 8.4.2.2 Use as needed, used only in conjunction with _CST. + +_CST 8.4.2.1 Low power idle states (8.4.4) are recommended instead + of C-states. + +_CWS 9.18.6 Use as needed. _DDN 6.1.4 This field can be used for a device name. However, it is meant for DOS device names (e.g., COM1), so be @@ -305,11 +374,11 @@ _DDN 6.1.4 This field can be used for a device name. However, _DEP 6.5.8 Use as needed. -_DIS 6.2.3 Optional, for power management use. +_DIS 6.2.3 Use as needed, for power management use. -_DLM 5.7.5 Optional. +_DLM 5.7.5 Use as needed. -_DMA 6.2.4 Optional. +_DMA 6.2.4 Use as needed. _DSD 6.2.5 To be used with caution. If this object is used, try to use it within the constraints already defined by the @@ -325,19 +394,29 @@ _DSD 6.2.5 To be used with caution. If this object is used, try with the UEFI Forum; this may cause some iteration as more than one OS will be registering entries. -_DSM Do not use this method. It is not standardized, the +_DSM 9.1.1 Do not use this method. It is not standardized, the return values are not well documented, and it is currently a frequent source of error. -_DSW 7.2.1 Use as needed; power management specific. +_DSW 7.3.1 Use as needed; power management specific. -_EDL 6.3.1 Optional. +_DTI 11.4.6 Use as needed. -_EJD 6.3.2 Optional. +_EDL 6.3.1 Use as needed. -_EJx 6.3.3 Optional. +_EJD 6.3.2 Use as needed. -_FIX 6.2.7 x86 specific, not used on arm64. +_EJx 6.3.3 Use as needed. + +_FIF 11.3.1.1 Use as needed. + +_FPS 11.3.1.2 Use as needed. + +_FSL 11.3.1.3 Use as needed. + +_FST 11.3.1.4 Use as needed. + +_GCP 9.18.2 Use as needed. \_GL 5.7.1 This object is not to be used in hardware reduced mode, and therefore should not be used on arm64. @@ -349,35 +428,57 @@ _GLK 6.5.7 This object requires a global lock be defined; there \_GPE 5.3.1 This namespace is for x86 use only. Do not use it on arm64. -_GSB 6.2.7 Optional. +_GRT 9.18.3 Use as needed. + +_GSB 6.2.7 Use as needed. + +_GTF 9.9.1.1 Use as needed. + +_GWS 9.18.5 Use as needed. _HID 6.1.5 Use as needed. This is the primary object to use in device probing, though _CID and _CLS may also be used. -_HPP 6.2.8 Optional, PCI specific. +_HOT 11.4.7 Use as needed. + +_HPP 6.2.8 Use as needed, PCI specific. -_HPX 6.2.9 Optional, PCI specific. +_HPX 6.2.9 Use as needed, PCI specific. -_HRV 6.1.6 Optional, use as needed to clarify device behavior; in - some cases, this may be easier to use than _DSD. +_HRV 6.1.6 Use as needed, use as needed to clarify device + behavior; in some cases, this may be easier to use + than _DSD. _INI 6.5.1 Not required, but can be useful in setting up devices when UEFI leaves them in a state that may not be what the driver expects before it starts probing. -_IRC 7.2.15 Use as needed; power management specific. +_IRC 7.3.15 Use as needed; power management specific. + +_LCK 6.3.4 Use as needed. + +_LPI 8.4.4.3 Use as needed, but recommended for use with processor + definitions (_HID ACPI0010) on arm64. See also _RDI. -_LCK 6.3.4 Optional. +_MAT 6.2.10 Use as needed; see also the MADT. -_MAT 6.2.10 Optional; see also the MADT. +_MBM 9.13.2.1 Use as needed. -_MLS 6.1.7 Optional, but highly recommended for use in +_MLS 6.1.7 Use as needed, but highly recommended for use in internationalization. -_OFF 7.1.2 It is recommended to define this method for any device +_MSG 9.2.2 Use as needed. + +_MSM 9.13.2.2 Use as needed. + +_MTL 11.4.8 Use as needed. + +_NTT 11.4.9 Use as needed. + +_OFF 7.2.2 It is recommended to define this method for any device that can be turned on or off. -_ON 7.1.3 It is recommended to define this method for any device +_ON 7.2.3 It is recommended to define this method for any device that can be turned on or off. \_OS 5.7.3 This method will return "Linux" by default (this is @@ -405,115 +506,220 @@ _OSC 6.2.11 This method can be a global method in ACPI (i.e., being used or what functionality is provided. The _OSC method is to be used instead. -_OST 6.3.5 Optional. +_OST 6.3.5 Use as needed. + +_PCT 8.4.6.1 Use as needed; power management specific. _PDC 8.4.1 Deprecated, do not use on arm64. +_PDL 8.4.6.2 Use as needed; power management specific. + \_PIC 5.8.1 The method should not be used. On arm64, the only interrupt model available is GIC. -_PLD 6.1.8 Optional. +_PLD 6.1.8 Use as needed. + +_PPC 8.4.6.3 Use as needed; power management specific. + +_PPE 8.4.8 Use as needed. \_PR 5.3.1 This namespace is for x86 use only on legacy systems. Do not use it on arm64. -_PRS 6.2.12 Optional. +_PRE 7.3.12 Use as needed; power management specific. + +_PRR 7.3.26 Use as needed; power management specific. + +_PRS 6.2.12 Use as needed. _PRT 6.2.13 Required as part of the definition of all PCI root devices. -_PRW 7.2.13 Use as needed; power management specific. +_PRW 7.3.13 Use as needed; power management specific. -_PRx 7.2.8-11 Use as needed; power management specific. If _PR0 is +_PRx 7.3.8-11 Use as needed; power management specific. If _PR0 is defined, _PR3 must also be defined. -_PSC 7.2.6 Use as needed; power management specific. +_PSC 7.3.6 Use as needed; power management specific. + +_PSD 8.4.6.5 Use as needed; power management specific. -_PSE 7.2.7 Use as needed; power management specific. +_PSE 7.3.7 Use as needed; power management specific. -_PSW 7.2.14 Use as needed; power management specific. +_PSL 11.4.10 Use as needed. -_PSx 7.2.2-5 Use as needed; power management specific. If _PS0 is +_PSS 8.4.6.2 Use as needed; power management specific. + +_PSV 11.4.11 Use as needed. + +_PSW 7.3.14 Use as needed; power management specific. + +_PSx 7.3.2-5 Use as needed; power management specific. If _PS0 is defined, _PS3 must also be defined. If clocks or regulators need adjusting to be consistent with power usage, change them in these methods. -\_PTS 7.3.1 Use as needed; power management specific. +_PTC 8.4.5.1 Use as needed; power management specific. + +\_PTS 7.4.1 Use as needed; power management specific. + +_PUR 8.5.1.1 Use as needed. + +_PXM 6.2.14 Use as needed. -_PXM 6.2.14 Optional. +_RDI 8.4.4.4 Use as needed, but recommended for use with processor + definitions (_HID ACPI0010) on arm64. This should only + be used in conjunction with _LPI. _REG 6.5.4 Use as needed. \_REV 5.7.4 Always returns the latest version of ACPI supported. -_RMV 6.3.6 Optional. +_RMV 6.3.6 Use as needed. + +_RST 7.3.25 Use as needed; power management specific. + +_RTV 11.4.12 Use as needed. \_SB 5.3.1 Required on arm64; all devices must be defined in this namespace. +_SCP 11.4.13 Use as needed. + +_SDD 9.9.3.3.1 Use as needed. + _SEG 6.5.6 Use as needed; PCI-specific. -\_SI 5.3.1, Optional. - 9.1 +\_SI 5.3.1, Use as needed. + 9.2 + +_SLI 6.2.15 Use as needed; recommended when SLIT table is in use. -_SLI 6.2.15 Optional; recommended when SLIT table is in use. +_SRT 9.18.4 Use as needed. _STA 6.3.7, It is recommended to define this method for any device - 7.1.4 that can be turned on or off. + 7.2.4 that can be turned on or off. See also the STAO table + that provides overrides to hide devices in virtualized + environments. -_SRS 6.2.16 Optional; see also _PRS. +_SRS 6.2.16 Use as needed; see also _PRS. + +_SST 9.2.1 Use as needed. _STR 6.1.10 Recommended for conveying device names to end users; this is preferred over using _DDN. +_SST 9.2.1 Use as needed. + +_STP 9.18.7 Use as needed. + +_STV 9.18.8 Use as needed. + _SUB 6.1.9 Use as needed; _HID or _CID are preferred. -_SUN 6.1.11 Optional. +_SUN 6.1.11 Use as needed, but recommended. -\_Sx 7.3.2 Use as needed; power management specific. +\_Sx 7.4.2 Use as needed; power management specific. -_SxD 7.2.16-19 Use as needed; power management specific. +_SxD 7.3.16-19 Use as needed; power management specific. -_SxW 7.2.20-24 Use as needed; power management specific. +_SxW 7.3.20-24 Use as needed; power management specific. -_SWS 7.3.3 Use as needed; power management specific; this may +_SWS 7.4.3 Use as needed; power management specific; this may require specification changes for use on arm64. -\_TTS 7.3.4 Use as needed; power management specific. +_TC1 11.4.14 Use as needed. + +_TC2 11.4.15 Use as needed. + +_TDL 8.4.5.5 Use as needed; power management specific. + +_TFP 11.4.16 Use as needed. + +_TIP 9.18.9 Use as needed. + +_TIV 9.18.10 Use as needed. + +_TMP 11.4.17 Use as needed. + +_TPC 8.4.5.3 Use as needed; power management specific. -\_TZ 5.3.1 Optional. +_TPT 11.4.18 Use as needed. + +_TRT 11.4.19 Use as needed. + +_TSD 8.4.5.4 Use as needed; power management specific. + +_TSN 11.4.20 Use as needed. + +_TSP 11.4.21 Use as needed. + +_TSS 8.4.5.2 Use as needed; power management specific. + +_TST 11.4.22 Use as needed. + +\_TTS 7.4.4 Use as needed; power management specific. + +\_TZ 5.3.1 Use as needed. + +_TZD 11.4.23 Use as needed. + +_TZM 11.4.24 Use as needed. + +_TZP 11.4.25 Use as needed. _UID 6.1.12 Recommended for distinguishing devices of the same class; define it if at all possible. -\_WAK 7.3.5 Use as needed; power management specific. +_UPC 9.14 Use as needed. + +\_WAK 7.4.5 Use as needed; power management specific. + + ACPI Event Model ---------------- Do not use GPE block devices; these are not supported in the hardware reduced profile used by arm64. Since there are no GPE blocks defined for use on ARM -platforms, GPIO-signaled interrupts should be used for creating system events. +platforms, ACPI events must be signaled differently. + +There are two options: GPIO-signaled interrupts (Section 5.6.5), and +interrupt-signaled events (Section 5.6.9). Interrupt-signaled events are a +new feature in the ACPI 6.1 specification. Either -- or both -- can be used +on a given platform, and which to use may be dependent of limitations in any +given SoC. If possible, interrupt-signaled events are recommended. ACPI Processor Control ---------------------- -Section 8 of the ACPI specification is currently undergoing change that -should be completed in the 6.0 version of the specification. Processor -performance control will be handled differently for arm64 at that point -in time. Processor aggregator devices (section 8.5) will not be used, -for example, but another similar mechanism instead. - -While UEFI constrains what we can say until the release of 6.0, it is -recommended that CPPC (8.4.5) be used as the primary model. This will -still be useful into the future. C-states and P-states will still be -provided, but most of the current design work appears to favor CPPC. +Section 8 of the ACPI specification changed significantly in version 6.0. +Processors should now be defined as Device objects with _HID ACPI0007; do +not use the deprecated Processor statement in ASL. All multiprocessor systems +should also define a hierarchy of processors, done with Processor Container +Devices (see Section 8.4.3.1, _HID ACPI0010); do not use processor aggregator +devices (Section 8.5) to describe processor topology. Section 8.4 of the +specification describes the semantics of these object definitions and how +they interrelate. + +Most importantly, the processor hierarchy defined also defines the low power +idle states that are available to the platform, along with the rules for +determining which processors can be turned on or off and the circumstances +that control that. Without this information, the processors will run in +whatever power state they were left in by UEFI. + +Note too, that the processor Device objects defined and the entries in the +MADT for GICs are expected to be in sychronization. The _UID of the Device +object must correspond to processor IDs used in the MADT. + +It is recommended that CPPC (8.4.5) be used as the primary model for processor +performance control on arm64. C-states and P-states may become available at +some point in the future, but most current design work appears to favor CPPC. Further, it is essential that the ARMv8 SoC provide a fully functional implementation of PSCI; this will be the only mechanism supported by ACPI -to control CPU power state (including secondary CPU booting). - -More details will be provided on the release of the ACPI 6.0 specification. +to control CPU power state. Booting of secondary CPUs may be possible using +parking protocol, but only PSCI is to be used for ARM servers. ACPI System Address Map Interfaces @@ -535,21 +741,25 @@ used to indicate fatal errors that cannot be corrected, and require immediate attention. Since there is no direct equivalent of the x86 SCI or NMI, arm64 handles -these slightly differently. The SCI is handled as a normal GPIO-signaled -interrupt; given that these are corrected (or correctable) errors being -reported, this is sufficient. The NMI is emulated as the highest priority -GPIO-signaled interrupt possible. This implies some caution must be used -since there could be interrupts at higher privilege levels or even interrupts -at the same priority as the emulated NMI. In Linux, this should not be the -case but one should be aware it could happen. +these slightly differently. The SCI is handled as a high priority interrupt; +given that these are corrected (or correctable) errors being reported, this +is sufficient. The NMI is emulated as the highest priority interrupt +possible. This implies some caution must be used since there could be +interrupts at higher privilege levels or even interrupts at the same priority +as the emulated NMI. In Linux, this should not be the case but one should +be aware it could happen. ACPI Objects Not Supported on ARM64 ----------------------------------- While this may change in the future, there are several classes of objects that can be defined, but are not currently of general interest to ARM servers. +Some of these objects have x86 equivalents, and may actually make sense in ARM +servers. However, there is either no hardware available at present, or there +may not even be a non-ARM implementation yet. Hence, they are not currently +supported. -These are not supported: +The following classes of objects are not supported: -- Section 9.2: ambient light sensor devices @@ -571,16 +781,6 @@ These are not supported: -- Section 9.18: time and alarm devices (see 9.15) - -ACPI Objects Not Yet Implemented --------------------------------- -While these objects have x86 equivalents, and they do make some sense in ARM -servers, there is either no hardware available at present, or in some cases -there may not yet be a non-ARM implementation. Hence, they are currently not -implemented though that may change in the future. - -Not yet implemented are: - -- Section 10: power source and power meter devices -- Section 11: thermal management @@ -589,5 +789,31 @@ Not yet implemented are: -- Section 13: SMBus interfaces - -- Section 17: NUMA support (prototypes have been submitted for - review) + +This also mean that there is no support for the following objects: + +Name Section Name Section +---- ------------ ---- ------------ +_ALC 9.3.4 _FDM 9.10.3 +_ALI 9.3.2 _FIX 6.2.7 +_ALP 9.3.6 _GAI 10.4.5 +_ALR 9.3.5 _GHL 10.4.7 +_ALT 9.3.3 _GTM 9.9.2.1.1 +_BCT 10.2.2.10 _LID 9.5.1 +_BDN 6.5.3 _PAI 10.4.4 +_BIF 10.2.2.1 _PCL 10.3.2 +_BIX 10.2.2.1 _PIF 10.3.3 +_BLT 9.2.3 _PMC 10.4.1 +_BMA 10.2.2.4 _PMD 10.4.8 +_BMC 10.2.2.12 _PMM 10.4.3 +_BMD 10.2.2.11 _PRL 10.3.4 +_BMS 10.2.2.5 _PSR 10.3.1 +_BST 10.2.2.6 _PTP 10.4.2 +_BTH 10.2.2.7 _SBS 10.1.3 +_BTM 10.2.2.9 _SHL 10.4.6 +_BTP 10.2.2.8 _STM 9.9.2.1.1 +_DCK 6.5.2 _UPD 9.16.1 +_EC 12.12 _UPP 9.16.2 +_FDE 9.10.1 _WPC 10.5.2 +_FDI 9.10.2 _WPP 10.5.3 + diff --git a/Documentation/arm64/arm-acpi.txt b/Documentation/arm64/arm-acpi.txt index 570a4f8..12381c1 100644 --- a/Documentation/arm64/arm-acpi.txt +++ b/Documentation/arm64/arm-acpi.txt @@ -57,11 +57,11 @@ The short form of the rationale for ACPI on ARM is: -- The new ACPI governance process works well and Linux is now at the same table as hardware vendors and other OS vendors. In fact, there is no - longer any reason to feel that ACPI is only belongs to Windows or that + longer any reason to feel that ACPI only belongs to Windows or that Linux is in any way secondary to Microsoft in this arena. The move of ACPI governance into the UEFI forum has significantly opened up the specification development process, and currently, a large portion of the - changes being made to ACPI is being driven by Linux. + changes being made to ACPI are being driven by Linux. Key to the use of ACPI is the support model. For servers in general, the responsibility for hardware behaviour cannot solely be the domain of the @@ -159,7 +159,7 @@ Further, the ACPI core will only use the 64-bit address fields in the FADT (Fixed ACPI Description Table). Any 32-bit address fields in the FADT will be ignored on arm64. -Hardware reduced mode (see Section 4.1 of the ACPI 5.1 specification) will +Hardware reduced mode (see Section 4.1 of the ACPI 6.1 specification) will be enforced by the ACPI core on arm64. Doing so allows the ACPI core to run less complex code since it no longer has to provide support for legacy hardware from other architectures. Any fields that are not to be used for @@ -167,7 +167,7 @@ hardware reduced mode must be set to zero. For the ACPI core to operate properly, and in turn provide the information the kernel needs to configure devices, it expects to find the following -tables (all section numbers refer to the ACPI 5.1 specfication): +tables (all section numbers refer to the ACPI 6.1 specfication): -- RSDP (Root System Description Pointer), section 5.2.5 @@ -185,9 +185,22 @@ tables (all section numbers refer to the ACPI 5.1 specfication): -- If PCI is supported, the MCFG (Memory mapped ConFiGuration Table), section 5.2.6, specifically Table 5-31. + -- If booting without a console=<device> kernel parameter is + supported, the SPCR (Serial Port Console Redirection table), + section 5.2.6, specifically Table 5-31. + + -- If virtualization is supported, the IORT (Input Output Remapping + Table, section 5.2.6, specifically Table 5-31. + + -- If NUMA is supported, the SRAT (System Resource Affinity Table) + and SLIT (System Locality distance Information Table), sections + 5.2.16 and 5.2.17, respectively. + If the above tables are not all present, the kernel may or may not be able to boot properly since it may not be able to configure all of the -devices available. +devices available. This list of tables is not meant to be all inclusive; +in some environments other tables may be needed (e.g., any of the APEI +tables from section 18) to support specific functionality. ACPI Detection @@ -233,7 +246,7 @@ that looks like this: Name(KEY0, "value0"). An ACPI device driver would then retrieve the value of the property by evaluating the KEY0 object. However, using Name() this way has multiple problems: (1) ACPI limits names ("KEY0") to four characters unlike DT; (2) there is no industry -wide registry that maintains a list of names, minimzing re-use; (3) +wide registry that maintains a list of names, minimizing re-use; (3) there is also no registry for the definition of property values ("value0"), again making re-use difficult; and (4) how does one maintain backward compatibility as new hardware comes out? The _DSD method was created @@ -434,7 +447,8 @@ The ACPI specification changes regularly. During the year 2014, for instance, version 5.1 was released and version 6.0 substantially completed, with most of the changes being driven by ARM-specific requirements. Proposed changes are presented and discussed in the ASWG (ACPI Specification Working Group) which -is a part of the UEFI Forum. +is a part of the UEFI Forum. The current version of the ACPI specification +is 6.1 release in January 2016. Participation in this group is open to all UEFI members. Please see http://www.uefi.org/workinggroup for details on group membership. -- 2.5.5

8 years, 2 months

[PATCH v10] acpi, apei, arm64: APEI initial support for aarch64.

by fu.wei＠linaro.org

From: Tomasz Nowicki <tomasz.nowicki(a)linaro.org> This commit provides APEI arch-specific bits for aarch64 Meanwhile, (1)add a new subfunction "hest_ia32_init" for "acpi_disable_cmcff" which is used by IA-32 Architecture Corrected Machine Check (CMC). (2)move HEST type (ACPI_HEST_TYPE_IA32_CORRECTED_CHECK) checking to a generic place. (3)select HAVE_ACPI_APEI when EFI and ACPI is set on ARM64, because arch_apei_get_mem_attribute is using efi_mem_attributes on ARM64. [Fu Wei: improve && upstream] Signed-off-by: Tomasz Nowicki <tomasz.nowicki(a)linaro.org> Tested-by: Jonathan (Zhixiong) Zhang <zjzhang(a)codeaurora.org> Signed-off-by: Fu Wei <fu.wei(a)linaro.org> Acked-by: Hanjun Guo <hanjun.guo(a)linaro.org> Tested-by: Tyler Baicar <tbaicar(a)codeaurora.org> Acked-by: Will Deacon <will.deacon(a)arm.com> --- Changelog: v10:https://lkml.org/lkml/2016/4/ Fix the Alphabetical order problem in arch/arm64/Kconfig v9: https://lkml.org/lkml/2016/4/5/522 Improve the comment for arch_apei_flush_tlb_one. Using select "HAVE_ACPI_APEI if (ACPI && EFI)" to fix the EFI dependence problem. v8: https://lkml.org/lkml/2016/3/29/132 Fix a "undefined reference" bug by selecting EFI when ACPI_APEI is set on ARM64. v7: https://lkml.org/lkml/2016/3/17/183 Add comment for arch_apei_flush_tlb_one in arch/arm64/include/asm/acpi.h v6: https://lists.linaro.org/pipermail/linaro-acpi/2016-March/006644.html Move HEST type (ACPI_HEST_TYPE_IA32_CORRECTED_CHECK) checking to a generic place. Delete HAVE_ACPI_APEI_HEST_IA32. v5: https://lkml.org/lkml/2015/12/10/131 Add "HAVE_ACPI_APEI_HEST_IA32" instead of "#if defined(__i386__) || defined(__x86_64__)". v4: https://lkml.org/lkml/2015/12/8/188 Rebase to latest kernel version(4.4-rc4). Move arch_apei_flush_tlb_one into header file as a inline function Add a new subfunction "hest_ia_init" for "acpi_disable_cmcff". v3: https://lkml.org/lkml/2015/12/3/521 Remove "acpi_disable_cmcff" from arm64 code, and wrap it in hest.c by "#if defined(__i386__) || defined(__x86_64__)" v2: https://lkml.org/lkml/2015/12/2/432 Rebase to latest kernel version(4.4-rc3). Move arch_apei_flush_tlb_one() to arch/arm64/kernel/acpi.c v1: https://lkml.org/lkml/2015/8/14/199 Move arch_apei_flush_tlb_one() to arch/arm64/include/asm/apci.h. Delete arch/arm64/kernel/apei.c. Add "#ifdef CONFIG_ACPI_APEI" for "acpi_disable_cmcff". arch/arm64/Kconfig | 1 + arch/arm64/include/asm/acpi.h | 15 ++++++++++++++- arch/x86/kernel/acpi/apei.c | 3 --- drivers/acpi/apei/hest.c | 18 +++++++++++++++--- 4 files changed, 30 insertions(+), 7 deletions(-) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 4f43622..da16716 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -47,6 +47,7 @@ config ARM64 select GENERIC_TIME_VSYSCALL select HANDLE_DOMAIN_IRQ select HARDIRQS_SW_RESEND + select HAVE_ACPI_APEI if (ACPI && EFI) select HAVE_ALIGNED_STRUCT_PAGE if SLUB select HAVE_ARCH_AUDITSYSCALL select HAVE_ARCH_BITREVERSE diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h index aee323b..8db8379 100644 --- a/arch/arm64/include/asm/acpi.h +++ b/arch/arm64/include/asm/acpi.h @@ -17,6 +17,7 @@ #include <asm/cputype.h> #include <asm/smp_plat.h> +#include <asm/tlbflush.h> /* Macros for consistency checks of the GICC subtable of MADT */ #define ACPI_MADT_GICC_LENGTH \ @@ -110,7 +111,19 @@ static inline const char *acpi_get_enable_method(int cpu) } #ifdef CONFIG_ACPI_APEI +#define acpi_disable_cmcff 1 pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr); -#endif +/* + * Despite its name, this function must still broadcast the TLB + * invalidation in order to ensure other CPUs don't up with with junk + * entries as a result of speculation. Unusually, its also called in + * IRQ context (ghes_iounmap_irq) so if we ever need to use IPIs for + * TLB broadcasting, then we're in trouble here. + */ +static inline void arch_apei_flush_tlb_one(unsigned long addr) +{ + flush_tlb_kernel_range(addr, addr + PAGE_SIZE); +} +#endif /* CONFIG_ACPI_APEI */ #endif /*_ASM_ACPI_H*/ diff --git a/arch/x86/kernel/acpi/apei.c b/arch/x86/kernel/acpi/apei.c index c280df6..ea3046e 100644 --- a/arch/x86/kernel/acpi/apei.c +++ b/arch/x86/kernel/acpi/apei.c @@ -24,9 +24,6 @@ int arch_apei_enable_cmcff(struct acpi_hest_header *hest_hdr, void *data) struct acpi_hest_ia_corrected *cmc; struct acpi_hest_ia_error_bank *mc_bank; - if (hest_hdr->type != ACPI_HEST_TYPE_IA32_CORRECTED_CHECK) - return 0; - cmc = (struct acpi_hest_ia_corrected *)hest_hdr; if (!cmc->enabled) return 0; diff --git a/drivers/acpi/apei/hest.c b/drivers/acpi/apei/hest.c index 20b3fcf..792a0d9 100644 --- a/drivers/acpi/apei/hest.c +++ b/drivers/acpi/apei/hest.c @@ -123,7 +123,18 @@ EXPORT_SYMBOL_GPL(apei_hest_parse); */ static int __init hest_parse_cmc(struct acpi_hest_header *hest_hdr, void *data) { - return arch_apei_enable_cmcff(hest_hdr, data); + if (hest_hdr->type != ACPI_HEST_TYPE_IA32_CORRECTED_CHECK) + return 0; + + if (!acpi_disable_cmcff) + return !arch_apei_enable_cmcff(hest_hdr, data); + + return 0; +} + +static inline int __init hest_ia32_init(void) +{ + return apei_hest_parse(hest_parse_cmc, NULL); } struct ghes_arr { @@ -232,8 +243,9 @@ void __init acpi_hest_init(void) goto err; } - if (!acpi_disable_cmcff) - apei_hest_parse(hest_parse_cmc, NULL); + rc = hest_ia32_init(); + if (rc) + goto err; if (!ghes_disable) { rc = apei_hest_parse(hest_parse_ghes_count, &ghes_count); -- 2.5.5

8 years, 2 months

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