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Date: Sat, 23 Jul 2016 01:57:02 +0800
From: Fu Wei <fu.wei@...aro.org>
To: "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc: Len Brown <lenb@...nel.org>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Thomas Gleixner <tglx@...utronix.de>,
Marc Zyngier <marc.zyngier@....com>,
Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
Sudeep Holla <sudeep.holla@....com>,
Hanjun Guo <hanjun.guo@...aro.org>,
linux-arm-kernel@...ts.infradead.org,
Linaro ACPI Mailman List <linaro-acpi@...ts.linaro.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
rruigrok@...eaurora.org, harba@...eaurora.org,
Christopher Covington <cov@...eaurora.org>,
Timur Tabi <timur@...eaurora.org>,
G Gregory <graeme.gregory@...aro.org>,
Al Stone <al.stone@...aro.org>, Jon Masters <jcm@...hat.com>,
wei@...hat.com, Arnd Bergmann <arnd@...db.de>,
Wim Van Sebroeck <wim@...ana.be>,
Catalin Marinas <catalin.marinas@....com>,
Will Deacon <will.deacon@....com>,
Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>,
Leo Duran <leo.duran@....com>,
Guenter Roeck <linux@...ck-us.net>,
linux-watchdog@...r.kernel.org
Subject: Re: [PATCH v8 5/9] acpi/arm64: Add GTDT table parse driver
Hi Rafael,
On 21 July 2016 at 21:28, Rafael J. Wysocki <rjw@...ysocki.net> wrote:
> On Wednesday, July 20, 2016 02:18:00 AM fu.wei@...aro.org wrote:
>> From: Fu Wei <fu.wei@...aro.org>
>>
>> This patch adds support for parsing arch timer in GTDT,
>> provides some kernel APIs to parse all the PPIs and
>> always-on info in GTDT and export them.
>>
>> By this driver, we can simplify arm_arch_timer drivers, and
>> separate the ACPI GTDT knowledge from it.
>>
>> Signed-off-by: Fu Wei <fu.wei@...aro.org>
>> Signed-off-by: Hanjun Guo <hanjun.guo@...aro.org>
>> ---
>> arch/arm64/Kconfig | 1 +
>> drivers/acpi/Kconfig | 5 ++
>> drivers/acpi/Makefile | 1 +
>> drivers/acpi/arm64/Kconfig | 5 ++
>> drivers/acpi/arm64/Makefile | 1 +
>> drivers/acpi/arm64/acpi_gtdt.c | 152 +++++++++++++++++++++++++++++++++++++++++
>> drivers/clocksource/Kconfig | 1 -
>> include/linux/acpi.h | 6 ++
>> 8 files changed, 171 insertions(+), 1 deletion(-)
>>
>> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig
>> index 5a0a691..0b9fba7 100644
>> --- a/arch/arm64/Kconfig
>> +++ b/arch/arm64/Kconfig
>> @@ -2,6 +2,7 @@ config ARM64
>> def_bool y
>> select ACPI_CCA_REQUIRED if ACPI
>> select ACPI_GENERIC_GSI if ACPI
>> + select ACPI_GTDT if ACPI
>> select ACPI_REDUCED_HARDWARE_ONLY if ACPI
>> select ARCH_HAS_DEVMEM_IS_ALLOWED
>> select ARCH_HAS_ATOMIC64_DEC_IF_POSITIVE
>> diff --git a/drivers/acpi/Kconfig b/drivers/acpi/Kconfig
>> index b7e2e77..1cdc7d2 100644
>> --- a/drivers/acpi/Kconfig
>> +++ b/drivers/acpi/Kconfig
>> @@ -521,4 +521,9 @@ config XPOWER_PMIC_OPREGION
>>
>> endif
>>
>> +if ARM64
>> +source "drivers/acpi/arm64/Kconfig"
>> +
>> +endif
>> +
>> endif # ACPI
>> diff --git a/drivers/acpi/Makefile b/drivers/acpi/Makefile
>> index 251ce85..1a94ff7 100644
>> --- a/drivers/acpi/Makefile
>> +++ b/drivers/acpi/Makefile
>> @@ -99,5 +99,6 @@ obj-$(CONFIG_ACPI_EXTLOG) += acpi_extlog.o
>> obj-$(CONFIG_PMIC_OPREGION) += pmic/intel_pmic.o
>> obj-$(CONFIG_CRC_PMIC_OPREGION) += pmic/intel_pmic_crc.o
>> obj-$(CONFIG_XPOWER_PMIC_OPREGION) += pmic/intel_pmic_xpower.o
>> +obj-$(CONFIG_ARM64) += arm64/
>>
>> video-objs += acpi_video.o video_detect.o
>> diff --git a/drivers/acpi/arm64/Kconfig b/drivers/acpi/arm64/Kconfig
>> new file mode 100644
>> index 0000000..80201be
>> --- /dev/null
>> +++ b/drivers/acpi/arm64/Kconfig
>> @@ -0,0 +1,5 @@
>> +#
>> +# ACPI Configuration for ARM64
>> +#
>> +config ACPI_GTDT
>> + bool
>> diff --git a/drivers/acpi/arm64/Makefile b/drivers/acpi/arm64/Makefile
>> new file mode 100644
>> index 0000000..466de6b
>> --- /dev/null
>> +++ b/drivers/acpi/arm64/Makefile
>> @@ -0,0 +1 @@
>> +obj-$(CONFIG_ACPI_GTDT) += acpi_gtdt.o
>> diff --git a/drivers/acpi/arm64/acpi_gtdt.c b/drivers/acpi/arm64/acpi_gtdt.c
>> new file mode 100644
>> index 0000000..e1cfc9e
>> --- /dev/null
>> +++ b/drivers/acpi/arm64/acpi_gtdt.c
>> @@ -0,0 +1,152 @@
>> +/*
>> + * ARM Specific GTDT table Support
>> + *
>> + * Copyright (C) 2016, Linaro Ltd.
>> + * Author: Daniel Lezcano <daniel.lezcano@...aro.org>
>> + * Fu Wei <fu.wei@...aro.org>
>> + * Hanjun Guo <hanjun.guo@...aro.org>
>> + *
>> + * 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.
>> + */
>> +
>> +#include <linux/acpi.h>
>> +#include <linux/init.h>
>> +#include <linux/kernel.h>
>> +
>> +#include <clocksource/arm_arch_timer.h>
>> +
>> +#undef pr_fmt
>> +#define pr_fmt(fmt) "ACPI GTDT: " fmt
>> +
>> +typedef struct {
>> + struct acpi_table_gtdt *gtdt;
>> + void *platform_timer_start;
>> + void *gtdt_end;
>> +} acpi_gtdt_desc_t;
>> +
>> +static acpi_gtdt_desc_t acpi_gtdt_desc __initdata;
>> +
>> +static inline void *next_platform_timer(void *platform_timer)
>> +{
>> + struct acpi_gtdt_header *gh = platform_timer;
>> +
>> + platform_timer += gh->length;
>> + if (platform_timer < acpi_gtdt_desc.gtdt_end)
>> + return platform_timer;
>> +
>> + return NULL;
>> +}
>> +
>> +#define for_each_platform_timer(_g) \
>> + for (_g = acpi_gtdt_desc.platform_timer_start; _g; \
>> + _g = next_platform_timer(_g))
>> +
>> +static inline bool is_timer_block(void *platform_timer)
>> +{
>> + struct acpi_gtdt_header *gh = platform_timer;
>> +
>> + return gh->type == ACPI_GTDT_TYPE_TIMER_BLOCK;
>> +}
>> +
>> +static inline bool is_watchdog(void *platform_timer)
>> +{
>> + struct acpi_gtdt_header *gh = platform_timer;
>> +
>> + return gh->type == ACPI_GTDT_TYPE_WATCHDOG;
>> +}
>> +
>> +static int __init map_generic_timer_interrupt(u32 interrupt, u32 flags)
>> +{
>> + int trigger, polarity;
>> +
>> + if (!interrupt)
>> + return 0;
>> +
>> + trigger = (flags & ACPI_GTDT_INTERRUPT_MODE) ? ACPI_EDGE_SENSITIVE
>> + : ACPI_LEVEL_SENSITIVE;
>> +
>> + polarity = (flags & ACPI_GTDT_INTERRUPT_POLARITY) ? ACPI_ACTIVE_LOW
>> + : ACPI_ACTIVE_HIGH;
>> +
>> + return acpi_register_gsi(NULL, interrupt, trigger, polarity);
>> +}
>> +
>> +/*
>> + * Map the PPIs of per-cpu arch_timer.
>> + * @type: the type of PPI
>> + * Returns 0 if error.
>> + */
>> +int __init acpi_gtdt_map_ppi(int type)
>> +{
>> + struct acpi_table_gtdt *gtdt = acpi_gtdt_desc.gtdt;
>> +
>> + switch (type) {
>> + case PHYS_SECURE_PPI:
>> + return map_generic_timer_interrupt(gtdt->secure_el1_interrupt,
>> + gtdt->secure_el1_flags);
>> + case PHYS_NONSECURE_PPI:
>> + return map_generic_timer_interrupt(gtdt->non_secure_el1_interrupt,
>> + gtdt->non_secure_el1_flags);
>> + case VIRT_PPI:
>> + return map_generic_timer_interrupt(gtdt->virtual_timer_interrupt,
>> + gtdt->virtual_timer_flags);
>> +
>> + case HYP_PPI:
>> + return map_generic_timer_interrupt(gtdt->non_secure_el2_interrupt,
>> + gtdt->non_secure_el2_flags);
>> + default:
>> + pr_err("Map PPI failed: invalid type.\n");
>> + }
>> +
>> + return 0;
>> +}
>> +
>> +/*
>> + * acpi_gtdt_c3stop - got c3stop info from GTDT
>> + *
>> + * Returns 1 if the timer is powered in deep idle state, 0 otherwise.
>> + */
>> +bool __init acpi_gtdt_c3stop(void)
>> +{
>> + struct acpi_table_gtdt *gtdt = acpi_gtdt_desc.gtdt;
>> +
>> + return !(gtdt->non_secure_el1_flags & ACPI_GTDT_ALWAYS_ON);
>> +}
>> +
>> +/*
>> + * Get some basic info from GTDT table, and init the global variables above
>> + * for all timers initialization of Generic Timer.
>> + * This function does some validation on GTDT table.
>> + */
>> +int __init acpi_gtdt_init(struct acpi_table_header *table)
>> +{
>> + void *start;
>> + struct acpi_table_gtdt *gtdt;
>> +
>> + gtdt = container_of(table, struct acpi_table_gtdt, header);
>> +
>> + acpi_gtdt_desc.gtdt = gtdt;
>> + acpi_gtdt_desc.gtdt_end = (void *)table + table->length;
>> +
>> + if (table->revision < 2) {
>> + pr_debug("Revision:%d doesn't support Platform Timers.\n",
>> + table->revision);
>> + return 0;
>> + }
>> +
>> + if (!gtdt->platform_timer_count) {
>> + pr_debug("No Platform Timer.\n");
>> + return 0;
>> + }
>> +
>> + start = (void *)gtdt + gtdt->platform_timer_offset;
>> + if (start < (void *)table + sizeof(struct acpi_table_gtdt)) {
>> + pr_err(FW_BUG "Failed to init table: ACPI/GTDT is buggy.\n");
>
> I would prefer something like
>
> pr_err(FW_BUG "Failed to retrieve timer information from firmware (invalid data)\n");
>
> which is clear enough IMO and doesn't require whoever reads this message
> to know anything about ACPI/GTDT etc.
OK, NP, I will do, and Thanks for your suggestion :-)
I will also check other pr_* , see If I can update them
thanks
>
> Thanks,
> Rafael
>
--
Best regards,
Fu Wei
Software Engineer
Red Hat
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