From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753875AbcDSMag (ORCPT ); Tue, 19 Apr 2016 08:30:36 -0400 Received: from foss.arm.com ([217.140.101.70]:39499 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753786AbcDSMae (ORCPT ); Tue, 19 Apr 2016 08:30:34 -0400 From: Sudeep Holla To: "Rafael J. Wysocki" , linux-acpi@vger.kernel.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org Cc: Sudeep Holla , Lorenzo Pieralisi , Al Stone , Prashanth Prakash , Ashwin Chaugule , Mark Rutland Subject: [PATCH v4 4/5] arm64: add support for ACPI Low Power Idle(LPI) Date: Tue, 19 Apr 2016 13:30:12 +0100 Message-Id: <1461069013-13292-5-git-send-email-sudeep.holla@arm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1461069013-13292-1-git-send-email-sudeep.holla@arm.com> References: <1461069013-13292-1-git-send-email-sudeep.holla@arm.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This patch adds appropriate callbacks to support ACPI Low Power Idle (LPI) on ARM64. It also selects ARCH_SUPPORTS_ACPI_PROCESSOR_LPI if ACPI is enabled on ARM64. Cc: Lorenzo Pieralisi Cc: Mark Rutland Cc: linux-arm-kernel@lists.infradead.org Signed-off-by: Sudeep Holla --- arch/arm64/Kconfig | 1 + arch/arm64/kernel/acpi.c | 34 ++++++++++++++++++++++++++++++++++ drivers/firmware/psci.c | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 3 files changed, 83 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 4f436220384f..e7536540387d 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -10,6 +10,7 @@ config ARM64 select ARCH_HAS_SG_CHAIN select ARCH_HAS_TICK_BROADCAST if GENERIC_CLOCKEVENTS_BROADCAST select ARCH_USE_CMPXCHG_LOCKREF + select ARCH_SUPPORTS_ACPI_PROCESSOR_LPI if ACPI select ARCH_SUPPORTS_ATOMIC_RMW select ARCH_WANT_OPTIONAL_GPIOLIB select ARCH_WANT_COMPAT_IPC_PARSE_VERSION diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c index d1ce8e2f98b9..3c05ad5957be 100644 --- a/arch/arm64/kernel/acpi.c +++ b/arch/arm64/kernel/acpi.c @@ -18,6 +18,7 @@ #include #include #include +#include #include #include #include @@ -25,9 +26,11 @@ #include #include +#include #include #include #include +#include #ifdef CONFIG_ACPI_APEI # include @@ -211,6 +214,37 @@ void __init acpi_boot_table_init(void) } } +int acpi_processor_ffh_lpi_probe(unsigned int cpu) +{ + return arm_cpuidle_init(cpu); +} + +struct acpi_processor_lpi *lpi; +int acpi_processor_ffh_lpi_enter(struct acpi_processor_lpi *lpi, int idx) +{ + int ret; + + if (!idx) { + cpu_do_idle(); + return idx; + } + + /* TODO cpu_pm_{enter,exit} can be done in generic code ? */ + ret = cpu_pm_enter(); + if (!ret) { + /* + * Pass idle state index to cpu_suspend which in turn will + * call the CPU ops suspend protocol with idle index as a + * parameter. + */ + ret = arm_cpuidle_suspend(idx); + + cpu_pm_exit(); + } + + return ret ? -1 : idx; +} + #ifdef CONFIG_ACPI_APEI pgprot_t arch_apei_get_mem_attribute(phys_addr_t addr) { diff --git a/drivers/firmware/psci.c b/drivers/firmware/psci.c index af6c5c839568..70cf2a500d4b 100644 --- a/drivers/firmware/psci.c +++ b/drivers/firmware/psci.c @@ -24,6 +24,7 @@ #include #include #include +#include #include @@ -32,6 +33,7 @@ #include #include #include +#include /* * While a 64-bit OS can make calls with SMC32 calling conventions, for some @@ -316,8 +318,54 @@ static int psci_dt_cpu_init_idle(unsigned int cpu) return ret; } +static int __maybe_unused psci_acpi_cpu_init_idle(unsigned int cpu) +{ + int i, count; + u32 *psci_states; + struct acpi_processor *pr; + struct acpi_processor_lpi *lpi; + + pr = per_cpu(processors, cpu); + if (unlikely(!pr || !pr->flags.has_lpi)) + return -EINVAL; + + /* + * If the PSCI cpu_suspend function hook has not been initialized + * idle states must not be enabled, so bail out + */ + if (!psci_ops.cpu_suspend) + return -EOPNOTSUPP; + + count = pr->power.count - 1; + if (!count) + return -ENODEV; + + psci_states = kcalloc(count, sizeof(*psci_states), GFP_KERNEL); + if (!psci_states) + return -ENOMEM; + + for (i = 0; i < count; i++) { + u32 state; + + lpi = &pr->power.lpi_states[i + 1]; + state = lpi->address & 0xFFFFFFFF; + if (!psci_power_state_is_valid(state)) { + pr_warn("Invalid PSCI power state %#x\n", state); + kfree(psci_states); + return -EINVAL; + } + psci_states[i] = state; + } + /* Idle states parsed correctly, initialize per-cpu pointer */ + per_cpu(psci_power_state, cpu) = psci_states; + return 0; +} + int psci_cpu_init_idle(unsigned int cpu) { + if (!acpi_disabled) + return psci_acpi_cpu_init_idle(cpu); + return psci_dt_cpu_init_idle(cpu); } -- 1.9.1