From: Al Stone al.stone@linaro.org
As we want to get ACPI tables to parse and then use the information for system initialization, we should get the RSDP (Root System Description Pointer) first, it then locates Extended Root Description Table (XSDT) which contains all the 64-bit physical address that pointer to other boot-time tables.
Introduce acpi.c and its related head file in this patch to provide fundamental needs of extern variables and functions for ACPI core, and then get boot-time tables as needed. - asm/acenv.h for arch specific ACPICA environments and implementation, It is needed unconditionally by ACPI core; - asm/acpi.h for arch specific variables and functions needed by ACPI driver core; - acpi.c for ARM64 related ACPI implementation for ACPI driver core;
acpi_boot_table_init() is introduced to get RSDP and boot-time tables, it will be called in setup_arch() before paging_init(), so we should use eary_memremap() mechanism here to get the RSDP and all the table pointers.
FADT Major.Minor version was introduced in ACPI 5.1, it is the same as ACPI version.
In ACPI 5.1, some major gaps are fixed for ARM, such as updates in MADT table for GIC and SMP init, without those updates, we can not get the MPIDR for SMP init, and GICv2/3 related init information, so we can't boot arm64 ACPI properly with table versions predating 5.1.
If firmware provides ACPI tables with ACPI version less than 5.1, OS has no way to retrieve the configuration data that is necessary to init SMP boot protocol and the GIC properly, so disable ACPI if we get an FADT table with version less that 5.1 when acpi_boot_table_init() called.
CC: Catalin Marinas catalin.marinas@arm.com CC: Will Deacon will.deacon@arm.com CC: Lorenzo Pieralisi lorenzo.pieralisi@arm.com Tested-by: Suravee Suthikulpanit Suravee.Suthikulpanit@amd.com Tested-by: Yijing Wang wangyijing@huawei.com Tested-by: Mark Langsdorf mlangsdo@redhat.com Tested-by: Jon Masters jcm@redhat.com Tested-by: Timur Tabi timur@codeaurora.org Tested-by: Robert Richter rrichter@cavium.com Acked-by: Robert Richter rrichter@cavium.com Signed-off-by: Al Stone al.stone@linaro.org Signed-off-by: Graeme Gregory graeme.gregory@linaro.org Signed-off-by: Tomasz Nowicki tomasz.nowicki@linaro.org Signed-off-by: Hanjun Guo hanjun.guo@linaro.org --- arch/arm64/include/asm/acenv.h | 18 ++++++++ arch/arm64/include/asm/acpi.h | 45 ++++++++++++++++++ arch/arm64/kernel/Makefile | 1 + arch/arm64/kernel/acpi.c | 101 +++++++++++++++++++++++++++++++++++++++++ arch/arm64/kernel/setup.c | 5 ++ 5 files changed, 170 insertions(+) create mode 100644 arch/arm64/include/asm/acenv.h create mode 100644 arch/arm64/include/asm/acpi.h create mode 100644 arch/arm64/kernel/acpi.c
diff --git a/arch/arm64/include/asm/acenv.h b/arch/arm64/include/asm/acenv.h new file mode 100644 index 0000000..b49166f --- /dev/null +++ b/arch/arm64/include/asm/acenv.h @@ -0,0 +1,18 @@ +/* + * ARM64 specific ACPICA environments and implementation + * + * Copyright (C) 2014, Linaro Ltd. + * Author: Hanjun Guo hanjun.guo@linaro.org + * Author: Graeme Gregory graeme.gregory@linaro.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. + */ + +#ifndef _ASM_ACENV_H +#define _ASM_ACENV_H + +/* It is required unconditionally by ACPI core, update it when needed. */ + +#endif /* _ASM_ACENV_H */ diff --git a/arch/arm64/include/asm/acpi.h b/arch/arm64/include/asm/acpi.h new file mode 100644 index 0000000..8b837ab --- /dev/null +++ b/arch/arm64/include/asm/acpi.h @@ -0,0 +1,45 @@ +/* + * Copyright (C) 2013-2014, Linaro Ltd. + * Author: Al Stone al.stone@linaro.org + * Author: Graeme Gregory graeme.gregory@linaro.org + * Author: Hanjun Guo hanjun.guo@linaro.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; + */ + +#ifndef _ASM_ACPI_H +#define _ASM_ACPI_H + +/* Basic configuration for ACPI */ +#ifdef CONFIG_ACPI +#define acpi_strict 1 /* No out-of-spec workarounds on ARM64 */ +extern int acpi_disabled; +extern int acpi_noirq; +extern int acpi_pci_disabled; + +static inline void disable_acpi(void) +{ + acpi_disabled = 1; + acpi_pci_disabled = 1; + acpi_noirq = 1; +} + +/* + * It's used from ACPI core in kdump to boot UP system with SMP kernel, + * with this check the ACPI core will not override the CPU index + * obtained from GICC with 0 and not print some error message as well. + * Since MADT must provide at least one GICC structure for GIC + * initialization, CPU will be always available in MADT on ARM64. + */ +static inline bool acpi_has_cpu_in_madt(void) +{ + return true; +} + +static inline void arch_fix_phys_package_id(int num, u32 slot) { } + +#endif /* CONFIG_ACPI */ + +#endif /*_ASM_ACPI_H*/ diff --git a/arch/arm64/kernel/Makefile b/arch/arm64/kernel/Makefile index eaa77ed..8bdc6bd 100644 --- a/arch/arm64/kernel/Makefile +++ b/arch/arm64/kernel/Makefile @@ -34,6 +34,7 @@ arm64-obj-$(CONFIG_KGDB) += kgdb.o arm64-obj-$(CONFIG_EFI) += efi.o efi-stub.o efi-entry.o arm64-obj-$(CONFIG_PCI) += pci.o arm64-obj-$(CONFIG_ARMV8_DEPRECATED) += armv8_deprecated.o +arm64-obj-$(CONFIG_ACPI) += acpi.o
obj-y += $(arm64-obj-y) vdso/ obj-m += $(arm64-obj-m) diff --git a/arch/arm64/kernel/acpi.c b/arch/arm64/kernel/acpi.c new file mode 100644 index 0000000..f052e7a --- /dev/null +++ b/arch/arm64/kernel/acpi.c @@ -0,0 +1,101 @@ +/* + * ARM64 Specific Low-Level ACPI Boot Support + * + * Copyright (C) 2013-2014, Linaro Ltd. + * Author: Al Stone al.stone@linaro.org + * Author: Graeme Gregory graeme.gregory@linaro.org + * Author: Hanjun Guo hanjun.guo@linaro.org + * Author: Tomasz Nowicki tomasz.nowicki@linaro.org + * Author: Naresh Bhat naresh.bhat@linaro.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. + */ + +#define pr_fmt(fmt) "ACPI: " fmt + +#include <linux/acpi.h> +#include <linux/bootmem.h> +#include <linux/cpumask.h> +#include <linux/init.h> +#include <linux/irq.h> +#include <linux/irqdomain.h> +#include <linux/memblock.h> +#include <linux/smp.h> + +int acpi_noirq; /* skip ACPI IRQ initialization */ +int acpi_disabled; +EXPORT_SYMBOL(acpi_disabled); + +int acpi_pci_disabled; /* skip ACPI PCI scan and IRQ initialization */ +EXPORT_SYMBOL(acpi_pci_disabled); + +/* + * __acpi_map_table() will be called before page_init(), so early_ioremap() + * or early_memremap() should be called here to for ACPI table mapping. + */ +char *__init __acpi_map_table(unsigned long phys, unsigned long size) +{ + if (!phys || !size) + return NULL; + + return early_memremap(phys, size); +} + +void __init __acpi_unmap_table(char *map, unsigned long size) +{ + if (!map || !size) + return; + + early_memunmap(map, size); +} + +static int __init acpi_parse_fadt(struct acpi_table_header *table) +{ + struct acpi_table_fadt *fadt = (struct acpi_table_fadt *)table; + + /* + * Revision in table header is the FADT Major revision, and there + * is a minor revision of FADT which was introduced by ACPI 5.1, + * we only deal with ACPI 5.1 or newer revision to get GIC and SMP + * boot protocol configuration data, or we will disable ACPI. + */ + if (table->revision > 5 || + (table->revision == 5 && fadt->minor_revision >= 1)) + return 0; + + pr_warn("Unsupported FADT revision %d.%d, should be 5.1+, will disable ACPI\n", + table->revision, fadt->minor_revision); + disable_acpi(); + + return -EINVAL; +} + +/* + * acpi_boot_table_init() called from setup_arch(), always. + * 1. find RSDP and get its address, and then find XSDT + * 2. extract all tables and checksums them all + * 3. check ACPI FADT revision + * + * We can parse ACPI boot-time tables such as MADT after + * this function is called. + */ +void __init acpi_boot_table_init(void) +{ + /* If acpi_disabled, bail out */ + if (acpi_disabled) + return; + + /* Initialize the ACPI boot-time table parser. */ + if (acpi_table_init()) { + disable_acpi(); + return; + } + + if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt)) { + /* disable ACPI if no FADT is found */ + disable_acpi(); + pr_err("Can't find FADT\n"); + } +} diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c index 20fe293..ecd1a77 100644 --- a/arch/arm64/kernel/setup.c +++ b/arch/arm64/kernel/setup.c @@ -17,6 +17,7 @@ * along with this program. If not, see http://www.gnu.org/licenses/. */
+#include <linux/acpi.h> #include <linux/export.h> #include <linux/kernel.h> #include <linux/stddef.h> @@ -45,6 +46,7 @@ #include <linux/efi.h> #include <linux/personality.h>
+#include <asm/acpi.h> #include <asm/fixmap.h> #include <asm/cpu.h> #include <asm/cputype.h> @@ -398,6 +400,9 @@ void __init setup_arch(char **cmdline_p) efi_init(); arm64_memblock_init();
+ /* Parse the ACPI tables for possible boot-time configuration */ + acpi_boot_table_init(); + paging_init(); request_standard_resources();