Linaro-acpi September 2014

linaro-acpi@lists.linaro.org

28 participants
14 discussions

[PATCH 0/4 v2] Add tool to enable APEI tables test, other minor changes.

by Tomasz Nowicki

Patch set implement as follows: 1. Minor changes around existing tools - reorganize building process, - move common code to separate direction, - no functionality changes. 2. Add BFAPEI (Blob For APEI) tool which can create blobs for APEI testing. - see commit log for more details Changes for v2: - compilation regardless of whether APEI is used or not, - correct file name in comment headers, - move ACPI structures, defines, etc. to acpi.h headers, - suppress compiler warnings. Tomasz Nowicki (4): map, cab: Reorganize building process and tree hierarchy. bfapei: Add tool that can create blobs for APEI table testing. bfapei: Move generic ACPI structures to separated file, remove duplicated defines. Suppress compiler warnings, file comment headers cleanup. Makefile | 28 +- platforms/Makefile | 9 +- tools/bfapei/Makefile | 11 + tools/bfapei/bfapei.c | 271 +++++++++++++++++++ tools/bfapei/bfapei.h | 49 ++++ tools/cab/Makefile | 12 +- tools/cab/cab.c | 535 +------------------------------------- tools/cab/cab.h | 149 ----------- tools/common/Makefile | 4 + tools/common/build_aml.c | 455 ++++++++++++++++++++++++++++++++ tools/common/check_aml.c | 512 ++++++++++++++++++++++++++++++++++++ tools/common/include/acpi.h | 204 +++++++++++++++ tools/common/include/build_aml.h | 74 ++++++ tools/common/include/check_aml.h | 92 +++++++ tools/mab/Makefile | 13 +- tools/mab/mab.c | 437 +------------------------------ tools/mab/mab.h | 77 ------ 17 files changed, 1734 insertions(+), 1198 deletions(-) create mode 100644 tools/bfapei/Makefile create mode 100644 tools/bfapei/bfapei.c create mode 100644 tools/bfapei/bfapei.h create mode 100644 tools/common/Makefile create mode 100644 tools/common/build_aml.c create mode 100644 tools/common/check_aml.c create mode 100644 tools/common/include/acpi.h create mode 100644 tools/common/include/build_aml.h create mode 100644 tools/common/include/check_aml.h -- 1.7.9.5

7 years

[RFC 0/2] Enable KVM on ARM when booting with ACPI

by Alexander Spyridakis

KVM on ARM relies on device tree information, which is not available when booting with ACPI. In the case of VGIC we need to extract the relevant data from the MADT table and probe it accordingly. For the architected timer, we need to expose the correct interrupt line to KVM from the GTDT table. This series has been tested on the Foundation Model 0.8 build 5206 and is based on the "Introduce ACPI for ARM64 based on ACPI 5.1" patch series from Hanjun Guo. Alexander Spyridakis (2): ARM64 / ACPI: VGIC probe support with ACPI ARM64 / ACPI: Point KVM to the virtual timer interrupt when booting with ACPI include/kvm/arm_vgic.h | 6 ++++ virt/kvm/arm/arch_timer.c | 48 ++++++++++++++++++------- virt/kvm/arm/vgic-v2.c | 91 +++++++++++++++++++++++++++++++++++++++++++++++ virt/kvm/arm/vgic.c | 27 ++++++++------ 4 files changed, 150 insertions(+), 22 deletions(-) -- 1.9.1

9 years, 6 months

[PATCH v7 0/2] PCC: Platform Communication Channel

by Ashwin Chaugule

Changes since V6: - Cosmetic changes based on Lv's suggestions Changes since V5: - Optimize loop that matches channel request. - Use platform_create_bundle. - Replace ioread/writes. - Remove redundant code and headers. - Restructure common mailbox macros. - Reformat PCC cmd parsing. Changes since V4: - Folded PCC Mailbox helpers into pcc.c Changes since V3: - Added PCC helper functions to work around "struct device" limitations. - PCC driver changes to work with PCC specific Mailbox helpers. Changes since V2: - Rebased on top of git://git.linaro.org/landing-teams/working/fujitsu/integration.git branch mailbox-for-3.17 - Added PCC API to mailbox framework as per Arnd's suggestion to allow usage without ACPI. Changes since V1: - Integration with Mailbox framework - https://lkml.org/lkml/2014/5/15/49 This patchset adds support for the PCC (Platform Communication Channel) interface as described in the current ACPI 5.0 spec. See Section 14 of the ACPI spec - http://acpi.info/DOWNLOADS/ACPI_5_Errata%20A.pdf for more details on how PCC works. In brief PCC is a generic means for PCC clients, to talk to the firmware. The PCC register space is typically memory mapped IO and uses a doorbell mechanism to communicate synchronously from the OS to the firmware. The PCC driver is completely agnostic to the protocol implemented by the PCC clients. It only implements the enumeration of PCC channels and the low level transport mechanism and leaves the rest to the PCC clients. The PCC is meant to be useable in the future by clients such as CPPC (Collaborative Processor Performance Control), RAS (Reliability, Availability and Serviceability) and MPST (Memory Power State Tables) and possibly others. Ashwin Chaugule (2): Mailbox: Add support for Platform Communication Channel PCC test drivers/mailbox/Kconfig | 12 ++ drivers/mailbox/Makefile | 2 + drivers/mailbox/mailbox.c | 4 +- drivers/mailbox/mailbox.h | 16 +++ drivers/mailbox/pcc-test.c | 203 ++++++++++++++++++++++++++++++++ drivers/mailbox/pcc.c | 282 +++++++++++++++++++++++++++++++++++++++++++++ 6 files changed, 516 insertions(+), 3 deletions(-) create mode 100644 drivers/mailbox/mailbox.h create mode 100644 drivers/mailbox/pcc-test.c create mode 100644 drivers/mailbox/pcc.c -- 1.9.1

9 years, 6 months

[PATCH v4 00/18] Introduce ACPI for ARM64 based on ACPI 5.1

by Hanjun Guo

ACPI 5.1 has been released and now be freely available for download [1]. It fixed some major gaps to run ACPI on ARM, this patch just follow the ACPI 5.1 spec and prepare the code to run ACPI on ARM64. ACPI 5.1 has some major changes for the following tables and method which are essential for ARM platforms: 1) MADT table updates. 2) FADT updates for PSCI 3) GTDT This patch set is the ARM64 ACPI core patches covered MADT, FADT and GTDT, platform board specific drivers are not covered by this patch set, but we provided drivers for Juno to boot with ACPI only for review purpose. We first introduce acpi.c and its related head file which are needed by ACPI core, and then get RSDP to extract all the ACPI boot-time tables. When all the boot-time tables (FADT, MADT, GTDT) are ready, then parse them to init the sytem when booted. Specifically, a) we use FADT to init PSCI and use PSCI to boot SMP; b) Use MADT for GIC init and SMP init; c) GTDT for arch timer init. This patch set is based on 3.17-rc4 and was tested by Graeme on Juno and FVP base model boot with ACPI only OK, if you want to test them, you can pull from acpi-5.1-v4 branch in leg/acpi repo: git://git.linaro.org/leg/acpi/acpi.git Updates since v3: - Compile out sleep.c on ARM64 when ACPI enabled - refactor the GIC init code to address the comments from Marc and Arnd - refactor the SMP init code to fix some logic problem when PSCI is not present, also address some of Grant and Lorenzo's comments - reorder the patch series and move ACPI table changes to the front of patch set - rebase on top of 3.17-rc4 Updates since v2: - Refactor the code to make SMP/PSCI init with less sperated init path by Tomasz - make ACPI depend on EXPERT - Address lots of comments from Catalin, Sudeep, Geoff - Add Juno device ACPI driver patches for review Updates since v1: - Set ACPI default off on ARM64 suggested by Olof; - Rebase the patch set on top of linux-next branch/linux-pm tree which includes the ACPICA for full ACPI 5.1 support. - Update the document as suggested; - Adress lots of comments from Mark, Sudeep, Randy, Naresh, Olof, Geoff and more... [1]: http://www.uefi.org/sites/default/files/resources/ACPI_5_1release.pdf Al Stone (3): ARM64 / ACPI: Get RSDP and ACPI boot-time tables ARM64 / ACPI: Introduce early_param for "acpi" ARM64 / ACPI: Select ACPI_REDUCED_HARDWARE_ONLY if ACPI is enabled on ARM64 Ashwin Chaugule (1): ACPI / table: Add new function to get table entries Graeme Gregory (4): ARM64 / ACPI: Introduce sleep-arm.c ARM64 / ACPI: If we chose to boot from acpi then disable FDT ARM64 / ACPI: Enable ARM64 in Kconfig Documentation: ACPI for ARM64 Hanjun Guo (8): ARM64: Move the init of cpu_logical_map(0) before unflatten_device_tree() ARM64 / ACPI: Make PCI optional for ACPI on ARM64 ARM64 / ACPI: Parse FADT table to get PSCI flags for PSCI init ACPI / table: Print GIC information when MADT is parsed ARM64 / ACPI: Parse MADT for SMP initialization ACPI / processor: Make it possible to get CPU hardware ID via GICC ARM64 / ACPI: Introduce ACPI_IRQ_MODEL_GIC and register device's gsi ARM64 / ACPI: Parse GTDT to initialize arch timer Tomasz Nowicki (2): ACPI / table: Count matched and successfully parsed entries without specifying max entries ARM64 / ACPI: Add GICv2 specific ACPI boot support Documentation/arm64/arm-acpi.txt | 218 +++++++++++++++++++++ Documentation/kernel-parameters.txt | 3 +- arch/arm64/Kconfig | 3 + arch/arm64/include/asm/acenv.h | 18 ++ arch/arm64/include/asm/acpi.h | 96 ++++++++++ arch/arm64/include/asm/cpu_ops.h | 1 + arch/arm64/include/asm/pci.h | 11 ++ arch/arm64/include/asm/psci.h | 3 +- arch/arm64/include/asm/smp.h | 5 +- arch/arm64/kernel/Makefile | 1 + arch/arm64/kernel/acpi.c | 351 ++++++++++++++++++++++++++++++++++ arch/arm64/kernel/cpu_ops.c | 4 +- arch/arm64/kernel/psci.c | 78 +++++--- arch/arm64/kernel/setup.c | 23 ++- arch/arm64/kernel/smp.c | 2 +- arch/arm64/kernel/time.c | 7 + drivers/acpi/Kconfig | 6 +- drivers/acpi/Makefile | 6 +- drivers/acpi/bus.c | 3 + drivers/acpi/internal.h | 5 + drivers/acpi/processor_core.c | 37 ++++ drivers/acpi/sleep-arm.c | 28 +++ drivers/acpi/tables.c | 115 +++++++++-- drivers/clocksource/arm_arch_timer.c | 117 ++++++++++-- drivers/irqchip/irq-gic.c | 106 ++++++++++ drivers/irqchip/irqchip.c | 3 + include/linux/acpi.h | 5 + include/linux/clocksource.h | 6 + include/linux/irqchip/arm-gic-acpi.h | 31 +++ include/linux/pci.h | 37 +++- 30 files changed, 1238 insertions(+), 91 deletions(-) create mode 100644 Documentation/arm64/arm-acpi.txt create mode 100644 arch/arm64/include/asm/acenv.h create mode 100644 arch/arm64/include/asm/acpi.h create mode 100644 arch/arm64/include/asm/pci.h create mode 100644 arch/arm64/kernel/acpi.c create mode 100644 drivers/acpi/sleep-arm.c create mode 100644 include/linux/irqchip/arm-gic-acpi.h -- 1.7.9.5

9 years, 7 months

[PATCH v3 00/17] Introduce ACPI for ARM64 based on ACPI 5.1

by Hanjun Guo

ACPI 5.1 has been released and now be freely available for download [1]. It fixed some major gaps to run ACPI on ARM, this patch just follow the ACPI 5.1 spec and prepare the code to run ACPI on ARM64. ACPI 5.1 has some major changes for the following tables and method which are essential for ARM platforms: 1) MADT table updates. 2) FADT updates for PSCI 3) GTDT This patch set is the ARM64 ACPI core patches covered MADT, FADT and GTDT, platform board specific drivers are not covered by this patch set, but we provide drivers for Juno to boot with ACPI only in the follwing patch set for review purpose. We first introduce acpi.c and its related head file which are needed by ACPI core, and then get RSDP to extract all the ACPI boot-time tables. When all the boot-time tables (FADT, MADT, GTDT) are ready, then parse them to init the sytem when booted. Specifically, a) we use FADT to init PSCI and use PSCI to boot SMP; b) Use MADT for GIC init and SMP init; c) GTDT for arch timer init. This patch set is based on 3.17-rc2 and was tested by Graeme on Juno and FVP base model boot with ACPI only OK, if you want to test them, you can pull from acpi-5.1-v3 branch in leg/acpi repo: git://git.linaro.org/leg/acpi/acpi.git Updates since v2: - Refactor the code to make SMP/PSCI init with less sperated init path by Tomasz - make ACPI depend on EXPERT - Address lots of comments from Catalin, Sudeep, Geoff - Add Juno device ACPI driver patches for review Updates since v1: - Set ACPI default off on ARM64 suggested by Olof; - Rebase the patch set on top of linux-next branch/linux-pm tree which includes the ACPICA for full ACPI 5.1 support. - Update the document as suggested; - Adress lots of comments from Mark, Sudeep, Randy, Naresh, Olof, Geoff and more... [1]: http://www.uefi.org/sites/default/files/resources/ACPI_5_1release.pdf Al Stone (3): ARM64 / ACPI: Get RSDP and ACPI boot-time tables ARM64 / ACPI: Introduce early_param for "acpi" ARM64 / ACPI: Select ACPI_REDUCED_HARDWARE_ONLY if ACPI is enabled on ARM64 Ashwin Chaugule (1): ACPI / table: Add new function to get table entries Graeme Gregory (4): ARM64 / ACPI: Introduce lowlevel suspend function ARM64 / ACPI: If we chose to boot from acpi then disable FDT ARM64 / ACPI: Enable ARM64 in Kconfig Documentation: ACPI for ARM64 Hanjun Guo (8): ARM64: Move the init of cpu_logical_map(0) before unflatten_device_tree() ARM64 / ACPI: Make PCI optional for ACPI on ARM64 ARM64 / ACPI: Parse FADT table to get PSCI flags for PSCI init ACPI / table: Print GIC information when MADT is parsed ARM64 / ACPI: Parse MADT for SMP initialization ACPI / processor: Make it possible to get CPU hardware ID via GICC ARM64 / ACPI: Introduce ACPI_IRQ_MODEL_GIC and register device's gsi ARM64 / ACPI: Parse GTDT to initialize arch timer Tomasz Nowicki (1): ARM64 / ACPI: Add GICv2 specific ACPI boot support Documentation/arm64/arm-acpi.txt | 218 +++++++++++++++++++++ Documentation/kernel-parameters.txt | 3 +- arch/arm64/Kconfig | 3 + arch/arm64/include/asm/acenv.h | 18 ++ arch/arm64/include/asm/acpi.h | 108 ++++++++++ arch/arm64/include/asm/cpu_ops.h | 1 + arch/arm64/include/asm/pci.h | 11 ++ arch/arm64/include/asm/psci.h | 3 +- arch/arm64/include/asm/smp.h | 5 +- arch/arm64/kernel/Makefile | 1 + arch/arm64/kernel/acpi.c | 359 ++++++++++++++++++++++++++++++++++ arch/arm64/kernel/cpu_ops.c | 4 +- arch/arm64/kernel/irq.c | 5 + arch/arm64/kernel/psci.c | 78 +++++--- arch/arm64/kernel/setup.c | 23 ++- arch/arm64/kernel/smp.c | 2 +- arch/arm64/kernel/time.c | 7 + drivers/acpi/Kconfig | 6 +- drivers/acpi/Makefile | 2 +- drivers/acpi/bus.c | 3 + drivers/acpi/internal.h | 5 + drivers/acpi/processor_core.c | 37 ++++ drivers/acpi/tables.c | 113 +++++++++-- drivers/clocksource/arm_arch_timer.c | 117 +++++++++-- drivers/irqchip/irq-gic.c | 114 +++++++++++ include/linux/acpi.h | 5 + include/linux/clocksource.h | 6 + include/linux/irqchip/arm-gic-acpi.h | 33 ++++ include/linux/pci.h | 37 +++- 29 files changed, 1237 insertions(+), 90 deletions(-) create mode 100644 Documentation/arm64/arm-acpi.txt create mode 100644 arch/arm64/include/asm/acenv.h create mode 100644 arch/arm64/include/asm/acpi.h create mode 100644 arch/arm64/include/asm/pci.h create mode 100644 arch/arm64/kernel/acpi.c create mode 100644 include/linux/irqchip/arm-gic-acpi.h -- 1.7.9.5

9 years, 7 months

[RFC PATCH for Juno 0/2] Drivers for Juno to boot from ACPI

by Hanjun Guo

This patch set is example of the sort of driver changes needed to boot Juno using ACPI tables, which using the ACPI tables devloped for MS Windows and published by ARM [1]. For the smsc911x driver, it is based on the following ASL fragment which is part of DSDT for Juno: // LAN9118 Ethernet // Device(ETH0) { Name(_HID, "ARMH9118") Name(_UID, Zero) Name(_CRS, ResourceTemplate() { Memory32Fixed(ReadWrite, 0x1A000000, 0x1000) Interrupt(ResourceConsumer, Level, ActiveHigh, Exclusive) { 192 } }) } UART driver is just for review purpose, ARM is working on a more functional UART driver that does not poll to transmit. But it shows how to initialise SBSA compatible UART without clock definitions in DSDT. You also can refer to the boot log from [2]. [1]: https://github.com/ARM-software/edk2/tree/juno-acpi/ArmPlatformPkg/ArmJunoP… [2]: http://www.xora.org.uk/2014/08/29/juno-booting-from-acpi-tables/ Graeme Gregory (2): net: smsc911x add support for probing from ACPI tty: SBSA compatible UART drivers/net/ethernet/smsc/smsc911x.c | 38 ++++ drivers/tty/Kconfig | 6 + drivers/tty/Makefile | 1 + drivers/tty/sbsauart.c | 328 ++++++++++++++++++++++++++++++++++ 4 files changed, 373 insertions(+) create mode 100644 drivers/tty/sbsauart.c -- 1.7.9.5

9 years, 7 months

[RFC v1 0/6] CPPC as a PID backend

by Ashwin Chaugule

This patchset introduces CPPC(Collaborative Processor Performance Control) as a backend to the PID governor. The PID governor from intel_pstate.c maps cleanly onto some CPPC interfaces. e.g. The CPU performance requests are made on a continuous scale as against discrete pstate levels. The CPU performance feedback over an interval is gauged using platform specific counters which are also described by CPPC. Although CPPC describes several other registers to provide more hints to the platform, Linux as of today does not have the infrastructure to make use of those registers. Some of the CPPC specific information could be made available from the scheduler as part of the CPUfreq and Scheduler intergration work. Until then PID can be used as the front end for CPPC. Beyond code restructuring and renaming, this patchset does not change the logic from the intel_pstate.c driver. Kernel compilation times were compared with the original intel_pstate.c, intel backend(intel_pid_ctrl.c) and the CPPC backend and no significant overheads were noticed. Testing was performed on a Thinkpad X240 laptop. PID_CTRL + INTEL_PSTATE: ======================= real 5m37.742s user 18m42.575s sys 1m0.521s PID_CTRL + CPPC_PID_CTRL: ======================== real 5m48.321s user 18m24.487s sys 0m59.327s ORIGINAL INTEL_PSTATE: ====================== real 5m40.642s user 18m37.411s sys 1m0.185s The complete patchset including the PCC hacks used for testing is available in [4]. Changes since V0: [1] - Split intel_pstate.c into a generic PID governor and platform specific backend. - Add CPPC accessors as PID backend. CPPC: ==== CPPC (Collaborative Processor Performance Control) is a new way to control CPU performance using an abstract continous scale as against a discretized P-state scale which is tied to CPU frequency only. It is defined in the ACPI 5.0+ spec. In brief, the basic operation involves: - OS makes a CPU performance request. (Can provide min and max tolerable bounds) - Platform (such as BMC) is free to optimize request within requested bounds depending on power/thermal budgets etc. - Platform conveys its decision back to OS The communication between OS and platform occurs through another medium called (PCC) Platform communication Channel. This is a generic mailbox like mechanism which includes doorbell semantics to indicate register updates. The PCC driver is being discussed in a separate patchset [3] and is not included here, since CPPC is only one client of PCC. Finer details about the PCC and CPPC spec are available in the latest ACPI 5.1 specification.[2] [1] - http://lwn.net/Articles/608715/ [2] - http://www.uefi.org/sites/default/files/resources/ACPI_5_1release.pdf [3] - http://comments.gmane.org/gmane.linux.acpi.devel/70299 [4] - http://git.linaro.org/people/ashwin.chaugule/leg-kernel.git/shortlog/refs/h… Ashwin Chaugule (6): PID Controller governor PID: Move Turbo detection into backend driver PID: Move Baytrail specific accessors into backend driver PID: Add new function pointers to read multiple registers PID: Rename counters to make them more generic PID: Add CPPC (Collaborative Processor Performance) backend driver Documentation/cpu-freq/intel-pstate.txt | 43 -- Documentation/cpu-freq/pid_ctrl.txt | 41 ++ drivers/cpufreq/Kconfig | 19 + drivers/cpufreq/Kconfig.x86 | 2 +- drivers/cpufreq/Makefile | 4 +- drivers/cpufreq/cppc_pid_ctrl.c | 406 +++++++++++++ drivers/cpufreq/intel_pid_ctrl.c | 408 +++++++++++++ drivers/cpufreq/intel_pstate.c | 1012 ------------------------------- drivers/cpufreq/pid_ctrl.c | 615 +++++++++++++++++++ drivers/cpufreq/pid_ctrl.h | 113 ++++ 10 files changed, 1606 insertions(+), 1057 deletions(-) delete mode 100644 Documentation/cpu-freq/intel-pstate.txt create mode 100644 Documentation/cpu-freq/pid_ctrl.txt create mode 100644 drivers/cpufreq/cppc_pid_ctrl.c create mode 100644 drivers/cpufreq/intel_pid_ctrl.c delete mode 100644 drivers/cpufreq/intel_pstate.c create mode 100644 drivers/cpufreq/pid_ctrl.c create mode 100644 drivers/cpufreq/pid_ctrl.h -- 1.9.1

9 years, 7 months

leg-kernel tag leg-20140908.0 released

by G Gregory

The leg-kernel release has been made and tagged as leg-20140908.0 This is based on mainline kernel v3.17-rc4 Repository : http://git.linaro.org/leg/acpi/leg-kernel.git Direct Link: https://git.linaro.org/leg/acpi/leg-kernel.git/commit/99fe5441d3aec97594381… Notes :-

9 years, 7 months

[PATCH v6 0/2] PCC: Platform Communication Channel

by Ashwin Chaugule

Changes since V5: - Optimize loop that matches channel request. - Use platform_create_bundle. - Replace ioread/writes. - Remove redundant code and headers. - Restructure common mailbox macros. - Reformat PCC cmd parsing. Changes since V4: - Folded PCC Mailbox helpers into pcc.c Changes since V3: - Added PCC helper functions to work around "struct device" limitations. - PCC driver changes to work with PCC specific Mailbox helpers. Changes since V2: - Rebased on top of git://git.linaro.org/landing-teams/working/fujitsu/integration.git branch mailbox-for-3.17 - Added PCC API to mailbox framework as per Arnd's suggestion to allow usage without ACPI. Changes since V1: - Integration with Mailbox framework - https://lkml.org/lkml/2014/5/15/49 This patchset adds support for the PCC (Platform Communication Channel) interface as described in the current ACPI 5.0 spec. See Section 14 of the ACPI spec - http://acpi.info/DOWNLOADS/ACPI_5_Errata%20A.pdf for more details on how PCC works. In brief PCC is a generic means for PCC clients, to talk to the firmware. The PCC register space is typically memory mapped IO and uses a doorbell mechanism to communicate synchronously from the OS to the firmware. The PCC driver is completely agnostic to the protocol implemented by the PCC clients. It only implements the enumeration of PCC channels and the low level transport mechanism and leaves the rest to the PCC clients. The PCC is meant to be useable in the future by clients such as CPPC (Collaborative Processor Performance Control), RAS (Reliability, Availability and Serviceability) and MPST (Memory Power State Tables) and possibly others. Ashwin Chaugule (2): Mailbox: Add support for Platform Communication Channel PCC test drivers/mailbox/Kconfig | 12 ++ drivers/mailbox/Makefile | 2 + drivers/mailbox/mailbox.c | 4 +- drivers/mailbox/mailbox.h | 16 +++ drivers/mailbox/pcc-test.c | 203 +++++++++++++++++++++++++++++++++ drivers/mailbox/pcc.c | 279 +++++++++++++++++++++++++++++++++++++++++++++ 6 files changed, 513 insertions(+), 3 deletions(-) create mode 100644 drivers/mailbox/mailbox.h create mode 100644 drivers/mailbox/pcc-test.c create mode 100644 drivers/mailbox/pcc.c -- 1.9.1

9 years, 7 months

[PATCH v5 0/2] PCC: Platform Communication Channel

by Ashwin Chaugule

Changes since V4: - Folded PCC Mailbox helpers into pcc.c Changes since V3: - Added PCC helper functions to work around "struct device" limitations. - PCC driver changes to work with PCC specific Mailbox helpers. Changes since V2: - Rebased on top of git://git.linaro.org/landing-teams/working/fujitsu/integration.git branch mailbox-for-3.17 - Added PCC API to mailbox framework as per Arnd's suggestion to allow usage without ACPI. Changes since V1: - Integration with Mailbox framework - https://lkml.org/lkml/2014/5/15/49 This patchset adds support for the PCC (Platform Communication Channel) interface as described in the current ACPI 5.0 spec. See Section 14 of the ACPI spec - http://acpi.info/DOWNLOADS/ACPI_5_Errata%20A.pdf for more details on how PCC works. In brief PCC is a generic means for PCC clients, to talk to the firmware. The PCC register space is typically memory mapped IO and uses a doorbell mechanism to communicate synchronously from the OS to the firmware. The PCC driver is completely agnostic to the protocol implemented by the PCC clients. It only implements the enumeration of PCC channels and the low level transport mechanism and leaves the rest to the PCC clients. The PCC is meant to be useable in the future by clients such as CPPC (Collaborative Processor Performance Control), RAS (Reliability, Availability and Serviceability) and MPST (Memory Power State Tables) and possibly others. Ashwin Chaugule (2): Mailbox: Add support for Platform Communication Channel PCC test drivers/mailbox/Kconfig | 12 ++ drivers/mailbox/Makefile | 2 + drivers/mailbox/mailbox.c | 4 - drivers/mailbox/pcc-test.c | 207 ++++++++++++++++++++++++++ drivers/mailbox/pcc.c | 297 +++++++++++++++++++++++++++++++++++++ include/linux/mailbox_controller.h | 4 + 6 files changed, 522 insertions(+), 4 deletions(-) create mode 100644 drivers/mailbox/pcc-test.c create mode 100644 drivers/mailbox/pcc.c -- 1.9.1

9 years, 7 months

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Linaro-acpi September 2014