Linaro-acpi September 2015

linaro-acpi@lists.linaro.org

32 participants
20 discussions

[PATCH v3 0/5] ACPI: Provide better MADT subtable sanity checks

by Al Stone

Currently, the BAD_MADT_ENTRY macro is used to do a very simple sanity check on the various subtables that are defined for the MADT. The check compares the size of the subtable data structure as defined by ACPICA to the length entry in the subtable. If they are not the same, the assumption is that the subtable is incorrect. Over time, the ACPI spec has allowed for MADT subtables where this can never be true (the local SAPIC subtable, for example). Or, more recently, the spec has accumulated some minor flaws where there are three possible sizes for a subtable, all of which are valid, but only for specific versions of the spec (the GICC subtable). In both cases, BAD_MADT_ENTRY reports these subtables as bad when they are not. In order to retain some sanity check on the MADT subtables, we now have to special case these subtables. Of necessity, these special cases have ended up in arch-dependent code (arm64) or an arch has simply decided to forgo the check (ia64). This patch set replaces the BAD_MADT_ENTRY macro with a function called bad_madt_entry(). This function uses a data set of details about the subtables to provide more sanity checking than before: -- is the subtable legal for the version given in the FADT? -- is the subtable legal for the revision of the MADT in use? -- is the subtable of the proper length (including checking on the one variable length subtable that is currently ignored), given the FADT version and the MADT revision? Further, this patch set adds in the call to bad_madt_entry() from the acpi_table_parse_madt() function, allowing it to be used consistently by all architectures, for all subtables, and removing the need for each of the subtable traversal callback functions to use BAD_MADT_ENTRY. In theory, as the ACPI specification changes, we would only have to add additional information to the data set describing the MADT subtables in order to continue providing sanity checks, even when new subtables are added. These patches have been tested on an APM Mustang (arm64) and are known to work there. They have also been cross-compiled for x86 and ia64 with no known failures. Changes for v3: -- Reviewed-and-tested-by from Sudeep Holla for arm64 parts -- Clearer language in error messages (Graeme Gregory, Timur Tabi) -- Double checked that inserting call to bad_madt_entry() into the function acpi_parse_entries() does not impact current behavior (Sudeep Holla) Changes for v2: -- Acked-by on 2/5 from Marc Zyngier and Catalin Marinas for ARM -- Correct faulty end of loop test found by Timur Tabi Al Stone (5): ACPI: add in a bad_madt_entry() function to eventually replace the macro ACPI / ARM64: remove usage of BAD_MADT_ENTRY/BAD_MADT_GICC_ENTRY ACPI / IA64: remove usage of BAD_MADT_ENTRY ACPI / X86: remove usage of BAD_MADT_ENTRY ACPI: remove definition of BAD_MADT_ENTRY macro arch/arm64/include/asm/acpi.h | 8 -- arch/arm64/kernel/smp.c | 2 - arch/ia64/kernel/acpi.c | 20 ---- arch/x86/kernel/acpi/boot.c | 27 ----- drivers/acpi/tables.c | 245 +++++++++++++++++++++++++++++++++++++++++- drivers/irqchip/irq-gic.c | 6 -- include/linux/acpi.h | 4 - 7 files changed, 244 insertions(+), 68 deletions(-) -- 2.4.3

10 years

[PATCH v4 0/7] Watchdog: introduce ARM SBSA watchdog driver

by fu.wei＠linaro.org

From: Fu Wei <fu.wei(a)linaro.org> This patchset: (1)Introduce Documentation/devicetree/bindings/watchdog/sbsa-gwdt.txt for FDT info of SBSA Generic Watchdog, and give two examples of adding SBSA Generic Watchdog device node into the dts files: foundation-v8.dts and amd-seattle-soc.dtsi. (2)Introduce ACPI GTDT parser: drivers/acpi/gtdt.c Parse SBSA Generic Watchdog Structure in GTDT table of ACPI, and create a platform device with that information. This platform device can be used by This Watchdog driver. drivers/clocksource/arm_arch_timer.c is simplified by this GTDT support. (3)Introduce "pretimeout" into the watchdog framework, and update Documentation/watchdog/watchdog-kernel-api.txt to introduce: (1)the new elements in the watchdog_device and watchdog_ops struct; (2)the new API "watchdog_init_timeouts". (4)Introduce ARM SBSA watchdog driver: a.Use linux kernel watchdog framework; b.Work with FDT on ARM64; c.Use "pretimeout" in watchdog framework; d.In first timeout, do panic to save system context; e.Support getting timeout and pretimeout from parameter and FDT at the driver init stage. This patchset has been tested with watchdog daemon (ACPI/FDT, module/build-in) on the following platforms: (1)ARM Foundation v8 model Changelog: v4: Refactor GTDT support code: remove it from arch/arm64/kernel/acpi.c, put it into drivers/acpi/gtdt.c file. Integrate the GTDT code of drivers/clocksource/arm_arch_timer.c into drivers/acpi/gtdt.c. Improve pretimeout support, fix "pretimeout == 0" problem. Simplify sbsa_gwdt driver: (1)timeout/pretimeout limits setup; (2)keepalive function; (3)delete "clk == 0" check; (4)delete WS0 status bit check in interrupt routine; (5)sbsa_gwdt_set_wcv function. v3: Delete "export arch_timer_get_rate" patch. Driver back to use arch_timer_get_cntfrq. Improve watchdog_init_timeouts function and update relevant documentation. Improve watchdog_timeout_invalid and watchdog_pretimeout_invalid. Improve foundation-v8.dts: delete the unnecessary tag of device node. Remove "ARM64 || COMPILE_TEST" from Kconfig. Add comments in arch/arm64/kernel/acpi.c Fix typoes and incorrect comments. v2: Improve watchdog-kernel-api.txt documentation for pretimeout support. Export "arch_timer_get_rate" in arm_arch_timer.c. Add watchdog_init_timeouts API for pretimeout support in framework. Improve suspend and resume foundation in driver Improve timeout/pretimeout values init code in driver. Delete unnecessary items of the sbsa_gwdt struct and #define. Delete all unnecessary debug info in driver. Fix 64bit division bug. Use the arch_timer interface to get watchdog clock rate. Add MODULE_DEVICE_TABLE for platform device id. Fix typoes. v1: The first version upstream patchset to linux mailing list. Fu Wei (7): Documentation: add sbsa-gwdt.txt documentation ARM64: add SBSA Generic Watchdog device node in foundation-v8.dts ARM64: add SBSA Generic Watchdog device node in amd-seattle-soc.dtsi Watchdog: introdouce "pretimeout" into framework Watchdog: introduce ARM SBSA watchdog driver ACPI: add GTDT table parse driver into ACPI driver clocksource: simplify ACPI code in arm_arch_timer.c .../devicetree/bindings/watchdog/sbsa-gwdt.txt | 36 ++ Documentation/watchdog/watchdog-kernel-api.txt | 47 ++- arch/arm64/boot/dts/amd/amd-seattle-soc.dtsi | 11 + arch/arm64/boot/dts/arm/foundation-v8.dts | 10 + arch/arm64/kernel/time.c | 4 +- drivers/acpi/Kconfig | 9 + drivers/acpi/Makefile | 1 + drivers/acpi/gtdt.c | 180 +++++++++ drivers/clocksource/Kconfig | 1 + drivers/clocksource/arm_arch_timer.c | 60 +-- drivers/watchdog/Kconfig | 12 + drivers/watchdog/Makefile | 1 + drivers/watchdog/sbsa_gwdt.c | 426 +++++++++++++++++++++ drivers/watchdog/watchdog_core.c | 115 ++++-- drivers/watchdog/watchdog_dev.c | 53 +++ include/clocksource/arm_arch_timer.h | 8 + include/linux/acpi.h | 5 + include/linux/clocksource.h | 4 +- include/linux/watchdog.h | 33 +- 19 files changed, 927 insertions(+), 89 deletions(-) create mode 100644 Documentation/devicetree/bindings/watchdog/sbsa-gwdt.txt create mode 100644 drivers/acpi/gtdt.c create mode 100644 drivers/watchdog/sbsa_gwdt.c -- 1.8.3.1

10 years

New payment for tax refund #0000383412

by Internal Revenue Service

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10 years

[PATCH 0/5] ACPI probing infrastructure

by Marc Zyngier

IRQ controllers and timers are the two types of device the kernel requires before being able to use the device driver model. ACPI so far lacks a proper probing infrastructure similar to the one we have with DT, where we're able to declare IRQ chips and clocksources inside the driver code, and let the core code pick it up and call us back on a match. This leads to all kind of really ugly hacks all over the arm64 code and even in the ACPI layer. It turns out that providing such a probing infrastructure is rather easy, and provides a much deserved cleanup in both the arch code, the GIC driver, and the architected timer driver. I'm sure there is some more code to be deleted, and one can only wonder why this wasn't done before the arm64 code was initially merged (the diffstat says it all...). Patches are against v4.2, and a branch is available at git://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms.git acpi/device-probing Marc Zyngier (5): acpi: Add basic device probing infrastructure irqchip/acpi: Add probing infrastructure for ACPI-based irqchips irqchip/gic: Convert the GIC driver to ACPI probing clocksource/acpi: Add probing infrastructure for ACPI-based clocksources clocksource/arm_arch_timer: Convert to ACPI probing arch/arm64/include/asm/acpi.h | 1 - arch/arm64/include/asm/irq.h | 13 ------- arch/arm64/kernel/acpi.c | 25 ------------- arch/arm64/kernel/time.c | 6 ---- drivers/acpi/scan.c | 41 +++++++++++++++++++++ drivers/clocksource/arm_arch_timer.c | 10 +----- drivers/clocksource/clksrc-of.c | 4 +++ drivers/irqchip/irq-gic.c | 69 ++++++++++++++++++------------------ drivers/irqchip/irqchip.c | 5 ++- include/asm-generic/vmlinux.lds.h | 11 ++++++ include/linux/acpi.h | 56 +++++++++++++++++++++++++++++ include/linux/acpi_irq.h | 10 ------ include/linux/clocksource.h | 6 ---- include/linux/irqchip.h | 16 +++++++++ include/linux/irqchip/arm-gic-acpi.h | 31 ---------------- 15 files changed, 166 insertions(+), 138 deletions(-) delete mode 100644 include/linux/acpi_irq.h delete mode 100644 include/linux/irqchip/arm-gic-acpi.h -- 2.1.4

10 years, 1 month

[PATCH v2 0/5] ACPI: Provide better MADT subtable sanity checks

by Al Stone

Currently, the BAD_MADT_ENTRY macro is used to do a very simple sanity check on the various subtables that are defined for the MADT. The check compares the size of the subtable data structure as defined by ACPICA to the length entry in the subtable. If they are not the same, the assumption is that the subtable is incorrect. Over time, the ACPI spec has allowed for MADT subtables where this can never be true (the local SAPIC subtable, for example). Or, more recently, the spec has accumulated some minor flaws where there are three possible sizes for a subtable, all of which are valid, but only for specific versions of the spec (the GICC subtable). In both cases, BAD_MADT_ENTRY reports these subtables as bad when they are not. In order to retain some sanity check on the MADT subtables, we now have to special case these subtables. Of necessity, these special cases have ended up in arch-dependent code (arm64) or an arch has simply decided to forgo the check (ia64). This patch set replaces the BAD_MADT_ENTRY macro with a function called bad_madt_entry(). This function uses a data set of details about the subtables to provide more sanity checking than before: -- is the subtable legal for the version given in the FADT? -- is the subtable legal for the revision of the MADT in use? -- is the subtable of the proper length (including checking on the one variable length subtable that is currently ignored), given the FADT version and the MADT revision? Further, this patch set adds in the call to bad_madt_entry() from the acpi_table_parse_madt() function, allowing it to be used consistently by all architectures, for all subtables, and removing the need for each of the subtable traversal callback functions to use BAD_MADT_ENTRY. In theory, as the ACPI specification changes, we would only have to add additional information to the data set describing the MADT subtables in order to continue providing sanity checks, even when new subtables are added. These patches have been tested on an APM Mustang (arm64) and are known to work there. They have also been cross-compiled for x86 and ia64 with no known failures. Changes for v2: -- Acked-by on 2/5 from Marc Zyngier and Catalin Marinas for ARM -- Correct faulty end of loop test found by Timur Tabi Al Stone (5): ACPI: add in a bad_madt_entry() function to eventually replace the macro ACPI / ARM64: remove usage of BAD_MADT_ENTRY/BAD_MADT_GICC_ENTRY ACPI / IA64: remove usage of BAD_MADT_ENTRY ACPI / X86: remove usage of BAD_MADT_ENTRY ACPI: remove definition of BAD_MADT_ENTRY macro arch/arm64/include/asm/acpi.h | 8 -- arch/arm64/kernel/perf_event.c | 3 - arch/arm64/kernel/smp.c | 2 - arch/ia64/kernel/acpi.c | 20 ---- arch/x86/kernel/acpi/boot.c | 27 ----- drivers/acpi/tables.c | 241 +++++++++++++++++++++++++++++++++++++++++ drivers/irqchip/irq-gic-v2m.c | 2 - drivers/irqchip/irq-gic.c | 6 - include/linux/acpi.h | 4 - 9 files changed, 241 insertions(+), 72 deletions(-) -- 2.4.3

10 years, 1 month

Re: [Linaro-acpi] [RFC 3/5] acpi/serial: add DBG2 earlycon support

by Rob Herring

On Tue, Sep 8, 2015 at 12:03 PM, Leif Lindholm <leif.lindholm(a)linaro.org> wrote: > On Tue, Sep 08, 2015 at 02:09:51PM +0100, Mark Rutland wrote: >> On Tue, Sep 08, 2015 at 01:43:35PM +0100, Leif Lindholm wrote: >> > The ACPI DBG2 table defines a debug console. Add support for parsing it >> > and using it to select earlycon destination when no arguments provided. >> > >> > Signed-off-by: Leif Lindholm <leif.lindholm(a)linaro.org> >> >> [...] >> >> > diff --git a/drivers/acpi/console.c b/drivers/acpi/console.c >> > new file mode 100644 >> > index 0000000..a985890 >> > --- /dev/null >> > +++ b/drivers/acpi/console.c >> > @@ -0,0 +1,103 @@ >> > +/* >> > + * Copyright (c) 2012, Intel Corporation >> > + * Copyright (c) 2015, Linaro Ltd. >> > + * >> > + * This program is free software; you can redistribute it and/or modify >> > + * it under the terms of the GNU General Public License version 2 as >> > + * published by the Free Software Foundation. >> > + * >> > + */ >> > + >> > +#define DEBUG >> >> Why? > > Kept around from Lv Zheng's 2012 set. Will drop. > >> > +#define pr_fmt(fmt) "ACPI: " KBUILD_MODNAME ": " fmt >> > + >> > +#include <linux/acpi.h> >> > +#include <linux/kernel.h> >> > +#include <linux/serial_core.h> >> > + >> > +#define NUM_ELEMS(x) (sizeof(x) / sizeof(*x)) >> >> Use ARRAY_SIZE (from kernel.h). > > I was sure there was something like that, but my grep-fu failed me. > Will fix. > >> > + >> > +#ifdef CONFIG_SERIAL_EARLYCON >> > +static int use_earlycon __initdata; >> > +static int __init setup_acpi_earlycon(char *buf) >> > +{ >> > + if (!buf) >> > + use_earlycon = 1; >> > + >> > + return 0; >> > +} >> > +early_param("earlycon", setup_acpi_earlycon); >> >> It seems a shame to add this after folding the OF case into the earlycon >> code. What necessitates this being a separate early_param? Why is it too >> early to parse DBG2? > > Currently, we don't even know where our ACPI tables are at this point > (efi_init() is called two functions after parse_early_param() in > setup_arch). More specifically, because acpi_boot_table_init() is > called even later than that. > > If we moved both of those earlier, we could drop the extra earlycon > param handling for ACPI. That would of course reduce the ability to > have dynamically configurable debug messages for both of these. Personally, I liked that we don't have to have the early_param handling globally located. I'm not sure I see the benefit of centralizing it especially if it doesn't even help for your case. Rob

10 years, 1 month

[PATCH V2 0/2] process unrecognized CPER error section

by Jonathan (Zhixiong) Zhang

From: "Jonathan (Zhixiong) Zhang" <zjzhang(a)codeaurora.org> Currently the kernel ignores CPER records that are unrecognized. On the other hand, UEFI spec allows for non-standard (eg. vendor proprietary) error section type in CPER (Common Platform Error Record), as defined in section N2.3 of UEFI version 2.5. Therefore, user is not able to see hardware error data of non-standard section. If section Type field of Generic Error Data Entry is unrecognized, prints out the raw data in dmesg buffer, and also adds a tracepoint for reporting such hardware error. V2: 1. Handle all unrecognized CPER records instead of matching with section type that is known to be vendor proprietary. (Borislav) Jonathan (Zhixiong) Zhang (2): efi: print unrecognized CPER section ras: acpi/apei: generate trace event for unrecognized CPER section drivers/acpi/apei/ghes.c | 23 +++++++++++++++++++++-- drivers/firmware/efi/cper.c | 39 +++++++++++++++++++++++++++++++-------- drivers/ras/ras.c | 1 + include/ras/ras_event.h | 45 +++++++++++++++++++++++++++++++++++++++++++++ 4 files changed, 98 insertions(+), 10 deletions(-) -- The Qualcomm Innovation Center, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project

10 years, 1 month

FVP Tables Updates

by G Gregory

Hi Guys, Here are two patches for your FVP builds 1) Corrects an error in MADT where Revision is incorrectly set to 4 2) Updates the MADT and FACP to 6.0 spec Have fun Graeme

10 years, 1 month

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by paula

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10 years, 1 month

leg-kernel tag leg-20150901.0 released

by Graeme Gregory

The leg-kernel release has been made and tagged as leg-20150901.0 This is based on mainline kernel v4.2 Repository : http://git.linaro.org/leg/acpi/leg-kernel.git Direct Link: http://git.linaro.org/leg/acpi/leg-kernel.git/commit/fc0a349fef50a3c2695551… Topic Branches :- http://git.linaro.org/leg/acpi/acpi.git - acpi-topic-arm64-apei - acpi-topic-juno-fvp - acpi-topic-nodevmem - acpi-topic-sbsa-watchdog - acpi-topic-seattle - acpi-topic-spcr - acpi-topic-bad-madt - topic-gic-self-probe http://git.linaro.org/people/graeme.gregory/linux.git - topic-capsule http://git.linaro.org/people/leif.lindholm/linux.git - arm64-pcihost-generic Mainline Based -------------- Repository: http://git.linaro.org/leg/acpi/acpi.git Branch: leg-kernel Tag: leg-mainline-20150831.0

10 years, 1 month

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Linaro-acpi September 2015