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Initial ACPI support for arm64:

Browse source 
This series introduces preliminary ACPI 5.1 support to the arm64 kernel
 using the "hardware reduced" profile. We don't support any peripherals
 yet, so it's fairly limited in scope:
 
 - Memory init (UEFI)
 - ACPI discovery (RSDP via UEFI)
 - CPU init (FADT)
 - GIC init (MADT)
 - SMP boot (MADT + PSCI)
 - ACPI Kconfig options (dependent on EXPERT)
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Merge tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux

Pull initial ACPI support for arm64 from Will Deacon:
 "This series introduces preliminary ACPI 5.1 support to the arm64
  kernel using the "hardware reduced" profile.  We don't support any
  peripherals yet, so it's fairly limited in scope:

   - MEMORY init (UEFI)

   - ACPI discovery (RSDP via UEFI)

   - CPU init (FADT)

   - GIC init (MADT)

   - SMP boot (MADT + PSCI)

   - ACPI Kconfig options (dependent on EXPERT)

  ACPI for arm64 has been in development for a while now and hardware
  has been available that can boot with either FDT or ACPI tables.  This
  has been made possible by both changes to the ACPI spec to cater for
  ARM-based machines (known as "hardware-reduced" in ACPI parlance) but
  also a Linaro-driven effort to get this supported on top of the Linux
  kernel.  This pull request is the result of that work.

  These changes allow us to initialise the CPUs, interrupt controller,
  and timers via ACPI tables, with memory information and cmdline coming
  from EFI.  We don't support a hybrid ACPI/FDT scheme.  Of course,
  there is still plenty of work to do (a serial console would be nice!)
  but I expect that to happen on a per-driver basis after this core
  series has been merged.

  Anyway, the diff stat here is fairly horrible, but splitting this up
  and merging it via all the different subsystems would have been
  extremely painful.  Instead, we've got all the relevant Acks in place
  and I've not seen anything other than trivial (Kconfig) conflicts in
  -next (for completeness, I've included my resolution below).  Nearly
  half of the insertions fall under Documentation/.

  So, we'll see how this goes.  Right now, it all depends on EXPERT and
  I fully expect people to use FDT by default for the immediate future"

* tag 'arm64-upstream' of git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux: (31 commits)
  ARM64 / ACPI: make acpi_map_gic_cpu_interface() as void function
  ARM64 / ACPI: Ignore the return error value of acpi_map_gic_cpu_interface()
  ARM64 / ACPI: fix usage of acpi_map_gic_cpu_interface
  ARM64: kernel: acpi: honour acpi=force command line parameter
  ARM64: kernel: acpi: refactor ACPI tables init and checks
  ARM64: kernel: psci: let ACPI probe PSCI version
  ARM64: kernel: psci: factor out probe function
  ACPI: move arm64 GSI IRQ model to generic GSI IRQ layer
  ARM64 / ACPI: Don't unflatten device tree if acpi=force is passed
  ARM64 / ACPI: additions of ACPI documentation for arm64
  Documentation: ACPI for ARM64
  ARM64 / ACPI: Enable ARM64 in Kconfig
  XEN / ACPI: Make XEN ACPI depend on X86
  ARM64 / ACPI: Select ACPI_REDUCED_HARDWARE_ONLY if ACPI is enabled on ARM64
  clocksource / arch_timer: Parse GTDT to initialize arch timer
  irqchip: Add GICv2 specific ACPI boot support
  ARM64 / ACPI: Introduce ACPI_IRQ_MODEL_GIC and register device's gsi
  ACPI / processor: Make it possible to get CPU hardware ID via GICC
  ACPI / processor: Introduce phys_cpuid_t for CPU hardware ID
  ARM64 / ACPI: Parse MADT for SMP initialization
  ...
This commit is contained in:
Linus Torvalds 2015-04-24 08:23:45 -07:00
commit 836ee4874e
44 changed files with 2216 additions and 115 deletions
Download patch file Download diff file Expand all files Collapse all files

10
drivers/acpi/Kconfig
View file

@ -5,7 +5,7 @@
menuconfig ACPI
bool "ACPI (Advanced Configuration and Power Interface) Support"
depends on !IA64_HP_SIM
depends on IA64 || X86
depends on IA64 || X86 || (ARM64 && EXPERT)
depends on PCI
select PNP
default y
@ -48,9 +48,16 @@ config ACPI_LEGACY_TABLES_LOOKUP
config ARCH_MIGHT_HAVE_ACPI_PDC
bool
config ACPI_GENERIC_GSI
bool
config ACPI_SYSTEM_POWER_STATES_SUPPORT
bool
config ACPI_SLEEP
bool
depends on SUSPEND || HIBERNATION
depends on ACPI_SYSTEM_POWER_STATES_SUPPORT
default y
config ACPI_PROCFS_POWER
@ -163,6 +170,7 @@ config ACPI_PROCESSOR
tristate "Processor"
select THERMAL
select CPU_IDLE
depends on X86 || IA64
default y
help
This driver installs ACPI as the idle handler for Linux and uses

3
drivers/acpi/Makefile
View file

@ -23,7 +23,7 @@ acpi-y += nvs.o
# Power management related files
acpi-y += wakeup.o
acpi-y += sleep.o
acpi-$(CONFIG_ACPI_SYSTEM_POWER_STATES_SUPPORT) += sleep.o
acpi-y += device_pm.o
acpi-$(CONFIG_ACPI_SLEEP) += proc.o
@ -56,6 +56,7 @@ ifdef CONFIG_ACPI_VIDEO
acpi-y += video_detect.o
endif
acpi-y += acpi_lpat.o
acpi-$(CONFIG_ACPI_GENERIC_GSI) += gsi.o
# These are (potentially) separate modules

7
drivers/acpi/acpi_processor.c
View file

@ -170,7 +170,7 @@ static int acpi_processor_hotadd_init(struct acpi_processor *pr)
acpi_status status;
int ret;
if (pr->phys_id == -1)
if (pr->phys_id == PHYS_CPUID_INVALID)
return -ENODEV;
status = acpi_evaluate_integer(pr->handle, "_STA", NULL, &sta);
@ -215,7 +215,8 @@ static int acpi_processor_get_info(struct acpi_device *device)
union acpi_object object = { 0 };
struct acpi_buffer buffer = { sizeof(union acpi_object), &object };
struct acpi_processor *pr = acpi_driver_data(device);
int phys_id, cpu_index, device_declaration = 0;
phys_cpuid_t phys_id;
int cpu_index, device_declaration = 0;
acpi_status status = AE_OK;
static int cpu0_initialized;
unsigned long long value;
@ -263,7 +264,7 @@ static int acpi_processor_get_info(struct acpi_device *device)
}
phys_id = acpi_get_phys_id(pr->handle, device_declaration, pr->acpi_id);
if (phys_id < 0)
if (phys_id == PHYS_CPUID_INVALID)
acpi_handle_debug(pr->handle, "failed to get CPU physical ID.\n");
pr->phys_id = phys_id;

3
drivers/acpi/bus.c
View file

@ -448,6 +448,9 @@ static int __init acpi_bus_init_irq(void)
case ACPI_IRQ_MODEL_IOSAPIC:
message = "IOSAPIC";
break;
case ACPI_IRQ_MODEL_GIC:
message = "GIC";
break;
case ACPI_IRQ_MODEL_PLATFORM:
message = "platform specific model";
break;

105
drivers/acpi/gsi.c Normal file
View file

@ -0,0 +1,105 @@
/*
* ACPI GSI IRQ layer
*
* Copyright (C) 2015 ARM Ltd.
* Author: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
*
* 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/irq.h>
#include <linux/irqdomain.h>
enum acpi_irq_model_id acpi_irq_model;
static unsigned int acpi_gsi_get_irq_type(int trigger, int polarity)
{
switch (polarity) {
case ACPI_ACTIVE_LOW:
return trigger == ACPI_EDGE_SENSITIVE ?
IRQ_TYPE_EDGE_FALLING :
IRQ_TYPE_LEVEL_LOW;
case ACPI_ACTIVE_HIGH:
return trigger == ACPI_EDGE_SENSITIVE ?
IRQ_TYPE_EDGE_RISING :
IRQ_TYPE_LEVEL_HIGH;
case ACPI_ACTIVE_BOTH:
if (trigger == ACPI_EDGE_SENSITIVE)
return IRQ_TYPE_EDGE_BOTH;
default:
return IRQ_TYPE_NONE;
}
}
/**
* acpi_gsi_to_irq() - Retrieve the linux irq number for a given GSI
* @gsi: GSI IRQ number to map
* @irq: pointer where linux IRQ number is stored
*
* irq location updated with irq value [>0 on success, 0 on failure]
*
* Returns: linux IRQ number on success (>0)
* -EINVAL on failure
*/
int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
{
/*
* Only default domain is supported at present, always find
* the mapping corresponding to default domain by passing NULL
* as irq_domain parameter
*/
*irq = irq_find_mapping(NULL, gsi);
/*
* *irq == 0 means no mapping, that should
* be reported as a failure
*/
return (*irq > 0) ? *irq : -EINVAL;
}
EXPORT_SYMBOL_GPL(acpi_gsi_to_irq);
/**
* acpi_register_gsi() - Map a GSI to a linux IRQ number
* @dev: device for which IRQ has to be mapped
* @gsi: GSI IRQ number
* @trigger: trigger type of the GSI number to be mapped
* @polarity: polarity of the GSI to be mapped
*
* Returns: a valid linux IRQ number on success
* -EINVAL on failure
*/
int acpi_register_gsi(struct device *dev, u32 gsi, int trigger,
int polarity)
{
unsigned int irq;
unsigned int irq_type = acpi_gsi_get_irq_type(trigger, polarity);
/*
* There is no way at present to look-up the IRQ domain on ACPI,
* hence always create mapping referring to the default domain
* by passing NULL as irq_domain parameter
*/
irq = irq_create_mapping(NULL, gsi);
if (!irq)
return -EINVAL;
/* Set irq type if specified and different than the current one */
if (irq_type != IRQ_TYPE_NONE &&
irq_type != irq_get_trigger_type(irq))
irq_set_irq_type(irq, irq_type);
return irq;
}
EXPORT_SYMBOL_GPL(acpi_register_gsi);
/**
* acpi_unregister_gsi() - Free a GSI<->linux IRQ number mapping
* @gsi: GSI IRQ number
*/
void acpi_unregister_gsi(u32 gsi)
{
int irq = irq_find_mapping(NULL, gsi);
irq_dispose_mapping(irq);
}
EXPORT_SYMBOL_GPL(acpi_unregister_gsi);

4
drivers/acpi/internal.h
View file

@ -161,7 +161,11 @@ void acpi_ec_remove_query_handler(struct acpi_ec *ec, u8 query_bit);
/*--------------------------------------------------------------------------
Suspend/Resume
-------------------------------------------------------------------------- */
#ifdef CONFIG_ACPI_SYSTEM_POWER_STATES_SUPPORT
extern int acpi_sleep_init(void);
#else
static inline int acpi_sleep_init(void) { return -ENXIO; }
#endif
#ifdef CONFIG_ACPI_SLEEP
int acpi_sleep_proc_init(void);

6
drivers/acpi/osl.c
View file

@ -336,11 +336,11 @@ acpi_map_lookup_virt(void __iomem *virt, acpi_size size)
return NULL;
}
#ifndef CONFIG_IA64
#define should_use_kmap(pfn) page_is_ram(pfn)
#else
#if defined(CONFIG_IA64) || defined(CONFIG_ARM64)
/* ioremap will take care of cache attributes */
#define should_use_kmap(pfn) 0
#else
#define should_use_kmap(pfn) page_is_ram(pfn)
#endif
static void __iomem *acpi_map(acpi_physical_address pg_off, unsigned long pg_sz)

60
drivers/acpi/processor_core.c
View file

@ -32,7 +32,7 @@ static struct acpi_table_madt *get_madt_table(void)
}
static int map_lapic_id(struct acpi_subtable_header *entry,
u32 acpi_id, int *apic_id)
u32 acpi_id, phys_cpuid_t *apic_id)
{
struct acpi_madt_local_apic *lapic =
container_of(entry, struct acpi_madt_local_apic, header);
@ -48,7 +48,7 @@ static int map_lapic_id(struct acpi_subtable_header *entry,
}
static int map_x2apic_id(struct acpi_subtable_header *entry,
int device_declaration, u32 acpi_id, int *apic_id)
int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id)
{
struct acpi_madt_local_x2apic *apic =
container_of(entry, struct acpi_madt_local_x2apic, header);
@ -65,7 +65,7 @@ static int map_x2apic_id(struct acpi_subtable_header *entry,
}
static int map_lsapic_id(struct acpi_subtable_header *entry,
int device_declaration, u32 acpi_id, int *apic_id)
int device_declaration, u32 acpi_id, phys_cpuid_t *apic_id)
{
struct acpi_madt_local_sapic *lsapic =
container_of(entry, struct acpi_madt_local_sapic, header);
@ -83,10 +83,35 @@ static int map_lsapic_id(struct acpi_subtable_header *entry,
return 0;
}
static int map_madt_entry(int type, u32 acpi_id)
/*
* Retrieve the ARM CPU physical identifier (MPIDR)
*/
static int map_gicc_mpidr(struct acpi_subtable_header *entry,
int device_declaration, u32 acpi_id, phys_cpuid_t *mpidr)
{
struct acpi_madt_generic_interrupt *gicc =
container_of(entry, struct acpi_madt_generic_interrupt, header);
if (!(gicc->flags & ACPI_MADT_ENABLED))
return -ENODEV;
/* device_declaration means Device object in DSDT, in the
* GIC interrupt model, logical processors are required to
* have a Processor Device object in the DSDT, so we should
* check device_declaration here
*/
if (device_declaration && (gicc->uid == acpi_id)) {
*mpidr = gicc->arm_mpidr;
return 0;
}
return -EINVAL;
}
static phys_cpuid_t map_madt_entry(int type, u32 acpi_id)
{
unsigned long madt_end, entry;
int phys_id = -1; /* CPU hardware ID */
phys_cpuid_t phys_id = PHYS_CPUID_INVALID; /* CPU hardware ID */
struct acpi_table_madt *madt;
madt = get_madt_table();
@ -111,18 +136,21 @@ static int map_madt_entry(int type, u32 acpi_id)
} else if (header->type == ACPI_MADT_TYPE_LOCAL_SAPIC) {
if (!map_lsapic_id(header, type, acpi_id, &phys_id))
break;
} else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT) {
if (!map_gicc_mpidr(header, type, acpi_id, &phys_id))
break;
}
entry += header->length;
}
return phys_id;
}
static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
static phys_cpuid_t map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
{
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
struct acpi_subtable_header *header;
int phys_id = -1;
phys_cpuid_t phys_id = PHYS_CPUID_INVALID;
if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
goto exit;
@ -143,33 +171,35 @@ static int map_mat_entry(acpi_handle handle, int type, u32 acpi_id)
map_lsapic_id(header, type, acpi_id, &phys_id);
else if (header->type == ACPI_MADT_TYPE_LOCAL_X2APIC)
map_x2apic_id(header, type, acpi_id, &phys_id);
else if (header->type == ACPI_MADT_TYPE_GENERIC_INTERRUPT)
map_gicc_mpidr(header, type, acpi_id, &phys_id);
exit:
kfree(buffer.pointer);
return phys_id;
}
int acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id)
phys_cpuid_t acpi_get_phys_id(acpi_handle handle, int type, u32 acpi_id)
{
int phys_id;
phys_cpuid_t phys_id;
phys_id = map_mat_entry(handle, type, acpi_id);
if (phys_id == -1)
if (phys_id == PHYS_CPUID_INVALID)
phys_id = map_madt_entry(type, acpi_id);
return phys_id;
}
int acpi_map_cpuid(int phys_id, u32 acpi_id)
int acpi_map_cpuid(phys_cpuid_t phys_id, u32 acpi_id)
{
#ifdef CONFIG_SMP
int i;
#endif
if (phys_id == -1) {
if (phys_id == PHYS_CPUID_INVALID) {
/*
* On UP processor, there is no _MAT or MADT table.
* So above phys_id is always set to -1.
* So above phys_id is always set to PHYS_CPUID_INVALID.
*
* BIOS may define multiple CPU handles even for UP processor.
* For example,
@ -190,7 +220,7 @@ int acpi_map_cpuid(int phys_id, u32 acpi_id)
if (nr_cpu_ids <= 1 && acpi_id == 0)
return acpi_id;
else
return phys_id;
return -1;
}
#ifdef CONFIG_SMP
@ -208,7 +238,7 @@ int acpi_map_cpuid(int phys_id, u32 acpi_id)
int acpi_get_cpuid(acpi_handle handle, int type, u32 acpi_id)
{
int phys_id;
phys_cpuid_t phys_id;
phys_id = acpi_get_phys_id(handle, type, acpi_id);

52
drivers/acpi/tables.c
View file

@ -23,6 +23,8 @@
*
*/
/* Uncomment next line to get verbose printout */
/* #define DEBUG */
#define pr_fmt(fmt) "ACPI: " fmt
#include <linux/init.h>
@ -61,9 +63,9 @@ void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
{
struct acpi_madt_local_apic *p =
(struct acpi_madt_local_apic *)header;
pr_info("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
p->processor_id, p->id,
(p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
pr_debug("LAPIC (acpi_id[0x%02x] lapic_id[0x%02x] %s)\n",
p->processor_id, p->id,
(p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
}
break;
@ -71,9 +73,9 @@ void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
{
struct acpi_madt_local_x2apic *p =
(struct acpi_madt_local_x2apic *)header;
pr_info("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
p->local_apic_id, p->uid,
(p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
pr_debug("X2APIC (apic_id[0x%02x] uid[0x%02x] %s)\n",
p->local_apic_id, p->uid,
(p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
}
break;
@ -81,8 +83,8 @@ void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
{
struct acpi_madt_io_apic *p =
(struct acpi_madt_io_apic *)header;
pr_info("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
p->id, p->address, p->global_irq_base);
pr_debug("IOAPIC (id[0x%02x] address[0x%08x] gsi_base[%d])\n",
p->id, p->address, p->global_irq_base);
}
break;
@ -155,9 +157,9 @@ void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
{
struct acpi_madt_io_sapic *p =
(struct acpi_madt_io_sapic *)header;
pr_info("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
p->id, (void *)(unsigned long)p->address,
p->global_irq_base);
pr_debug("IOSAPIC (id[0x%x] address[%p] gsi_base[%d])\n",
p->id, (void *)(unsigned long)p->address,
p->global_irq_base);
}
break;
@ -165,9 +167,9 @@ void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
{
struct acpi_madt_local_sapic *p =
(struct acpi_madt_local_sapic *)header;
pr_info("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
p->processor_id, p->id, p->eid,
(p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
pr_debug("LSAPIC (acpi_id[0x%02x] lsapic_id[0x%02x] lsapic_eid[0x%02x] %s)\n",
p->processor_id, p->id, p->eid,
(p->lapic_flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
}
break;
@ -183,6 +185,28 @@ void acpi_table_print_madt_entry(struct acpi_subtable_header *header)
}
break;
case ACPI_MADT_TYPE_GENERIC_INTERRUPT:
{
struct acpi_madt_generic_interrupt *p =
(struct acpi_madt_generic_interrupt *)header;
pr_debug("GICC (acpi_id[0x%04x] address[%llx] MPIDR[0x%llx] %s)\n",
p->uid, p->base_address,
p->arm_mpidr,
(p->flags & ACPI_MADT_ENABLED) ? "enabled" : "disabled");
}
break;
case ACPI_MADT_TYPE_GENERIC_DISTRIBUTOR:
{
struct acpi_madt_generic_distributor *p =
(struct acpi_madt_generic_distributor *)header;
pr_debug("GIC Distributor (gic_id[0x%04x] address[%llx] gsi_base[%d])\n",
p->gic_id, p->base_address,
p->global_irq_base);
}
break;
default:
pr_warn("Found unsupported MADT entry (type = 0x%x)\n",
header->type);