/*
* acpi.c - Architecture-Specific Low-Level ACPI Support
*
* Copyright (C) 1999 VA Linux Systems
* Copyright (C) 1999,2000 Walt Drummond <drummond@valinux.com>
* Copyright (C) 2000, 2002-2003 Hewlett-Packard Co.
* David Mosberger-Tang <davidm@hpl.hp.com>
* Copyright (C) 2000 Intel Corp.
* Copyright (C) 2000,2001 J.I. Lee <jung-ik.lee@intel.com>
* Copyright (C) 2001 Paul Diefenbaugh <paul.s.diefenbaugh@intel.com>
* Copyright (C) 2001 Jenna Hall <jenna.s.hall@intel.com>
* Copyright (C) 2001 Takayoshi Kochi <t-kochi@bq.jp.nec.com>
* Copyright (C) 2002 Erich Focht <efocht@ess.nec.de>
* Copyright (C) 2004 Ashok Raj <ashok.raj@intel.com>
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
*/
#include <linux/module.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/sched.h>
#include <linux/smp.h>
#include <linux/string.h>
#include <linux/types.h>
#include <linux/irq.h>
#include <linux/acpi.h>
#include <linux/efi.h>
#include <linux/mmzone.h>
#include <linux/nodemask.h>
#include <asm/io.h>
#include <asm/iosapic.h>
#include <asm/machvec.h>
#include <asm/page.h>
#include <asm/system.h>
#include <asm/numa.h>
#include <asm/sal.h>
#include <asm/cyclone.h>
#define BAD_MADT_ENTRY(entry, end) ( \
(!entry) || (unsigned long)entry + sizeof(*entry) > end || \
((struct acpi_subtable_header *)entry)->length < sizeof(*entry))
#define PREFIX "ACPI: "
void (*pm_idle) (void);
EXPORT_SYMBOL(pm_idle);
void (*pm_power_off) (void);
EXPORT_SYMBOL(pm_power_off);
unsigned int acpi_cpei_override;
unsigned int acpi_cpei_phys_cpuid;
unsigned long acpi_wakeup_address = 0;
#ifdef CONFIG_IA64_GENERIC
static unsigned long __init acpi_find_rsdp(void)
{
unsigned long rsdp_phys = 0;
if (efi.acpi20 != EFI_INVALID_TABLE_ADDR)
rsdp_phys = efi.acpi20;
else if (efi.acpi != EFI_INVALID_TABLE_ADDR)
printk(KERN_WARNING PREFIX
"v1.0/r0.71 tables no longer supported\n");
return rsdp_phys;
}
#endif
const char __init *
acpi_get_sysname(void)
{
#ifdef CONFIG_IA64_GENERIC
unsigned long rsdp_phys;
struct acpi_table_rsdp *rsdp;
struct acpi_table_xsdt *xsdt;
struct acpi_table_header *hdr;
rsdp_phys = acpi_find_rsdp();
if (!rsdp_phys) {
printk(KERN_ERR
"ACPI 2.0 RSDP not found, default to \"dig\"\n");
return "dig";
}
rsdp = (struct acpi_table_rsdp *)__va(rsdp_phys);
if (strncmp(rsdp->signature, ACPI_SIG_RSDP, sizeof(ACPI_SIG_RSDP) - 1)) {
printk(KERN_ERR
"ACPI 2.0 RSDP signature incorrect, default to \"dig\"\n");
return "dig";
}
xsdt = (struct acpi_table_xsdt *)__va(rsdp->xsdt_physical_address);
hdr = &xsdt->header;
if (strncmp(hdr->signature, ACPI_SIG_XSDT, sizeof(ACPI_SIG_XSDT) - 1)) {
printk(KERN_ERR
"ACPI 2.0 XSDT signature incorrect, default to \"dig\"\n");
return "dig";
}
if (!strcmp(hdr->oem_id, "HP")) {
return "hpzx1";
} else if (!strcmp(hdr->oem_id, "SGI")) {
if (!strcmp(hdr->oem_table_id + 4, "UV"))
return "uv";
else
return "sn2";
}
return "dig";
#else
# if defined (CONFIG_IA64_HP_SIM)
return "hpsim";
# elif defined (CONFIG_IA64_HP_ZX1)
return "hpzx1";
# elif defined (CONFIG_IA64_HP_ZX1_SWIOTLB)
return "hpzx1_swiotlb";
# elif defined (CONFIG_IA64_SGI_SN2)
return "sn2";
# elif defined (CONFIG_IA64_SGI_UV)
return "uv";
# elif defined (CONFIG_IA64_DIG)
return "dig";
# else
# error Unknown platform. Fix acpi.c.
# endif
#endif
}
#ifdef CONFIG_ACPI
#define ACPI_MAX_PLATFORM_INTERRUPTS 256
/* Array to record platform interrupt vectors for generic interrupt routing. */
int platform_intr_list[ACPI_MAX_PLATFORM_INTERRUPTS] = {
[0 ... ACPI_MAX_PLATFORM_INTERRUPTS - 1] = -1
};
enum acpi_irq_model_id acpi_irq_model = ACPI_IRQ_MODEL_IOSAPIC;
/*
* Interrupt routing API for device drivers. Provides interrupt vector for
* a generic platform event. Currently only CPEI is implemented.
*/
int acpi_request_vector(u32 int_type)
{
int vector = -1;
if (int_type < ACPI_MAX_PLATFORM_INTERRUPTS) {
/* corrected platform error interrupt */
vector = platform_intr_list[int_type];
} else
printk(KERN_ERR
"acpi_request_vector(): invalid interrupt type\n");
return vector;
}
char *__init __acpi_map_table(unsigned long phys_addr, unsigned long size)
{
return __va(phys_addr);
}
/* --------------------------------------------------------------------------
Boot-time Table Parsing
-------------------------------------------------------------------------- */
static int total_cpus __initdata;
static int available_cpus __initdata;
struct acpi_table_madt *acpi_madt __initdata;
static u8 has_8259;
static int __init
acpi_parse_lapic_addr_ovr(struct acpi_subtable_header * header,
const unsigned long end)
{
struct acpi_madt_local_apic_override *lapic;
lapic = (struct acpi_madt_local_apic_override *)header;
if (BAD_MADT_ENTRY(lapic, end))
return -EINVAL;
if (lapic->address) {
iounmap(ipi_base_addr);
ipi_base_addr = ioremap(lapic->address, 0);
}
return 0;
}
static int __init
acpi_parse_lsapic(struct acpi_subtable_header * header, const unsigned long end)
{
struct acpi_madt_local_sapic *lsapic;
lsapic = (struct acpi_madt_local_sapic *)header;
/*Skip BAD_MADT_ENTRY check, as lsapic size could vary */
if (lsapic->lapic_flags & ACPI_MADT_ENABLED) {
#ifdef CONFIG_SMP
smp_boot_data.cpu_phys_id[available_cpus] =
(lsapic->id << 8) | lsapic->eid;
#endif
++available_cpus;
}
total_cpus++;
return 0;
}
static int __init
acpi_parse_lapic_nmi(struct acpi_subtable_header * header, const unsigned long end)
{
struct acpi_madt_local_apic_nmi *lacpi_nmi;
lacpi_nmi = (struct acpi_madt_local_apic_nmi *)header;
if (BAD_MADT_ENTRY(lacpi_nmi, end))
return -EINVAL;
/* TBD: Support lapic_nmi entries */
return 0;
}
static int __init
acpi_parse_iosapic(struct acpi_subtable_header * header, const unsigned long end)
{
struct acpi_madt_io_sapic *iosapic;
iosapic = (struct acpi_madt_io_sapic *)header;
if (BAD_MADT_ENTRY(iosapic, end))
return -EINVAL;
return iosapic_init(iosapic->address, iosapic->global_irq_base);
}
static unsigned int __initdata acpi_madt_rev;
static int __init
acpi_parse_plat_int_src(struct acpi_subtable_header * header,
const unsigned long end)
{
struct acpi_madt_interrupt_source *plintsrc;
int vector;
plintsrc = (struct acpi_madt_interrupt_source *)header;
if (BAD_MADT_ENTRY(plintsrc, end))
return -EINVAL;
/*
* Get vector assignment for this interrupt, set attributes,
* and program the IOSAPIC routing table.
*/
vector = iosapic_register_platform_intr(plintsrc->type,
plintsrc->global_irq,
plintsrc->io_sapic_vector,
plintsrc->eid,
plintsrc->id,
((plintsrc->inti_flags & ACPI_MADT_POLARITY_MASK) ==
ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
((plintsrc->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
ACPI_MADT_TRIGGER_EDGE) ?
IOSAPIC_EDGE : IOSAPIC_LEVEL);
platform_intr_list[plintsrc->type] = vector;
if (acpi_madt_rev > 1) {
acpi_cpei_override = plintsrc->flags & ACPI_MADT_CPEI_OVERRIDE;
}
/*
* Save the physical id, so we can check when its being removed
*/
acpi_cpei_phys_cpuid = ((plintsrc->id << 8) | (plintsrc->eid)) & 0xffff;
return 0;
}
#ifdef CONFIG_HOTPLUG_CPU
unsigned int can_cpei_retarget(void)
{
extern int cpe_vector;
extern unsigned int force_cpei_retarget;
/*
* Only if CPEI is supported and the override flag
* is present, otherwise return that its re-targettable
* if we are in polling mode.
*/
if (cpe_vector > 0) {
if (acpi_cpei_override || force_cpei_retarget)
return 1;
else
return 0;
}
return 1;
}
unsigned int is_cpu_cpei_target(unsigned int cpu)
{
unsigned int logical_id;
logical_id = cpu_logical_id(acpi_cpei_phys_cpuid);
if (logical_id == cpu)
return 1;
else
return 0;
}
void set_cpei_target_cpu(unsigned int cpu)
{
acpi_cpei_phys_cpuid = cpu_physical_id(cpu);
}
#endif
unsigned int get_cpei_target_cpu(void)
{
return acpi_cpei_phys_cpuid;
}
static int __init
acpi_parse_int_src_ovr(struct acpi_subtable_header * header,
const unsigned long end)
{
struct acpi_madt_interrupt_override *p;
p = (struct acpi_madt_interrupt_override *)header;
if (BAD_MADT_ENTRY(p, end))
return -EINVAL;
iosapic_override_isa_irq(p->source_irq, p->global_irq,
((p->inti_flags & ACPI_MADT_POLARITY_MASK) ==
ACPI_MADT_POLARITY_ACTIVE_HIGH) ?
IOSAPIC_POL_HIGH : IOSAPIC_POL_LOW,
((p->inti_flags & ACPI_MADT_TRIGGER_MASK) ==
ACPI_MADT_TRIGGER_EDGE) ?
IOSAPIC_EDGE : IOSAPIC_LEVEL);
return 0;
}
static int __init
acpi_parse_nmi_src(struct acpi_subtable_header * header, const unsigned long end)
{
struct acpi_madt_nmi_source *nmi_src;
nmi_src = (struct acpi_madt_nmi_source *)header;
if (BAD_MADT_ENTRY(nmi_src, end))
return -EINVAL;
/* TBD: Support nimsrc entries */
return 0;
}
static void __init acpi_madt_oem_check(char *oem_id, char *oem_table_id)
{
if (!strncmp(oem_id, "IBM", 3) && (!strncmp(oem_table_id, "SERMOW", 6))) {
/*
* Unfortunately ITC_DRIFT is not yet part of the
* official SAL spec, so the ITC_DRIFT bit is not
* set by the BIOS on this hardware.
*/
sal_platform_features |= IA64_SAL_PLATFORM_FEATURE_ITC_DRIFT;
cyclone_setup();
}
}
static int __init acpi_parse_madt(struct acpi_table_header *table)
{
if (!table)
return -EINVAL;
acpi_madt = (struct acpi_table_madt *)table;
acpi_madt_rev = acpi_madt->header.revision;
/* remember the value for reference after free_initmem() */
#ifdef CONFIG_ITANIUM
has_8259 = 1; /* Firmware on old Itanium systems is broken */
#else
has_8259 = acpi_madt->flags & ACPI_MADT_PCAT_COMPAT;
#endif
iosapic_system_init(has_8259);
/* Get base address of IPI Message Block */
if (acpi_madt->address)
ipi_base_addr = ioremap(acpi_madt->address, 0);
printk(KERN_INFO PREFIX "Local APIC address %p\n", ipi_base_addr);
acpi_madt_oem_check(acpi_madt->header.oem_id,
acpi_madt->header.oem_table_id);
return 0;
}
#ifdef CONFIG_ACPI_NUMA
#undef SLIT_DEBUG
#define PXM_FLAG_LEN ((MAX_PXM_DOMAINS + 1)/32)
static int __initdata srat_num_cpus; /* number of cpus */
static u32 __devinitdata pxm_flag[PXM_FLAG_LEN];
#define pxm_bit_set(bit) (set_bit(bit,(void *)pxm_flag))
#define pxm_bit_test(bit) (test_bit(bit,(void *)pxm_flag))
static struct acpi_table_slit __initdata *slit_table;
cpumask_t early_cpu_possible_map = CPU_MASK_NONE;
static int get_processor_proximity_domain(struct acpi_srat_cpu_affinity *pa)
{
int pxm;
pxm = pa->proximity_domain_lo;
if (ia64_platform_is("sn2"))
pxm += pa->proximity_domain_hi[0] << 8;
return pxm;
}
static int get_memory_proximity_domain(struct acpi_srat_mem_affinity *ma)
{
int pxm;
pxm = ma->proximity_domain;
if (!ia64_platform_is("sn2"))
pxm &= 0xff;
return pxm;
}
/*
* ACPI 2.0 SLIT (System Locality Information Table)
* http://devresource.hp.com/devresource/Docs/TechPapers/IA64/slit.pdf
*/
void __init acpi_numa_slit_init(struct acpi_table_slit *slit)
{
u32 len;
len = sizeof(struct acpi_table_header) + 8
+ slit->locality_count * slit->locality_count;
if (slit->header.length != len) {
printk(KERN_ERR
"ACPI 2.0 SLIT: size mismatch: %d expected, %d actual\n",
len, slit->header.length);
return;
}
slit_table = slit;
}
void __init
acpi_numa_processor_affinity_init(struct acpi_srat_cpu_affinity *pa)
{
int pxm;
if (!(pa->flags & ACPI_SRAT_CPU_ENABLED))
return;
pxm = get_processor_proximity_domain(pa);
/* record this node in proximity bitmap */
pxm_bit_set(pxm);
node_cpuid[srat_num_cpus].phys_id =
(pa->apic_id << 8) | (pa->local_sapic_eid);
/* nid should be overridden as logical node id later */
node_cpuid[srat_num_cpus].nid = pxm;
cpu_set(srat_num_cpus, early_cpu_possible_map);
srat_num_cpus++;
}
void __init
acpi_numa_memory_affinity_init(struct acpi_srat_mem_affinity *ma)
{
unsigned long paddr, size;
int pxm;
struct node_memblk_s *p, *q, *pend;
pxm = get_memory_proximity_domain(ma);
/* fill node memory chunk structure */
paddr = ma->base_address;
size = ma->length;
/* Ignore disabled entries */
if (!(ma->flags & ACPI_SRAT_MEM_ENABLED))
return;
/* record this node in proximity bitmap */
pxm_bit_set(pxm);
/* Insertion sort based on base address */
pend = &node_memblk[num_node_memblks];
for (p = &node_memblk[0]; p < pend; p++) {
if (paddr < p->start_paddr)
break;
}
if (p < pend) {
for (q = pend - 1; q >= p; q--)
*(q + 1) = *q;
}
p->start_paddr = paddr;
p->size = size;
p->nid = pxm;
num_node_memblks++;
}
void __init acpi_numa_arch_fixup(void)
{
int i, j, node_from, node_to;
/* If there's no SRAT, fix the phys_id and mark node 0 online */
if (srat_num_cpus == 0) {
node_set_online(0);
node_cpuid[0].phys_id = hard_smp_processor_id();
return;
}
/*
* MCD - This can probably be dropped now. No need for pxm ID to node ID
* mapping with sparse node numbering iff MAX_PXM_DOMAINS <= MAX_NUMNODES.
*/
nodes_clear(node_online_map);
for (i = 0; i < MAX_PXM_DOMAINS; i++) {
if (pxm_bit_test(i)) {
int nid = acpi_map_pxm_to_node(i);
node_set_online(nid);
}
}
/* set logical node id in memory chunk structure */
for (i = 0; i < num_node_memblks; i++)
node_memblk[i].nid = pxm_to_node(node_memblk[i].nid);
/* assign memory bank numbers for each chunk on each node */
for_each_online_node(i) {
int bank;
bank = 0;
for (j = 0; j < num_node_memblks; j++)
if (node_memblk[j].nid == i)
node_memblk[j].bank = bank++;
}
/* set logical node id in cpu structure */
for_each_possible_early_cpu(i)
node_cpuid[i].nid = pxm_to_node(node_cpuid[i].nid);
printk(KERN_INFO "Number of logical nodes in system = %d\n",
num_online_nodes());
printk(KERN_INFO "Number of memory chunks in system = %d\n",
num_node_memblks);
if (!slit_table) {
for (i = 0; i < MAX_NUMNODES; i++)
for (j = 0; j < MAX_NUMNODES; j++)
node_distance(i, j) = i == j ? LOCAL_DISTANCE :
REMOTE_DISTANCE;
return;
}
memset(numa_slit, -1, sizeof(numa_slit));
for (i = 0; i < slit_table->locality_count; i++) {
if (!pxm_bit_test(i))
continue;
node_from = pxm_to_node(i);
for (j = 0; j < slit_table->locality_count; j++) {
if (!pxm_bit_test(j))
continue;
node_to = pxm_to_node(j);
node_distance(node_from, node_to) =
slit_table->entry[i * slit_table->locality_count + j];
}
}
#ifdef SLIT_DEBUG
printk("ACPI 2.0 SLIT locality table:\n");
for_each_online_node(i) {
for_each_online_node(j)
printk("%03d ", node_distance(i, j));
printk("\n");
}
#endif
}
#endif /* CONFIG_ACPI_NUMA */
/*
* success: return IRQ number (>=0)
* failure: return < 0
*/
int acpi_register_gsi(u32 gsi, int triggering, int polarity)
{
if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
return gsi;
if (has_8259 && gsi < 16)
return isa_irq_to_vector(gsi);
return iosapic_register_intr(gsi,
(polarity ==
ACPI_ACTIVE_HIGH) ? IOSAPIC_POL_HIGH :
IOSAPIC_POL_LOW,
(triggering ==
ACPI_EDGE_SENSITIVE) ? IOSAPIC_EDGE :
IOSAPIC_LEVEL);
}
void acpi_unregister_gsi(u32 gsi)
{
if (acpi_irq_model == ACPI_IRQ_MODEL_PLATFORM)
return;
if (has_8259 && gsi < 16)
return;
iosapic_unregister_intr(gsi);
}
static int __init acpi_parse_fadt(struct acpi_table_header *table)
{
struct acpi_table_header *fadt_header;
struct acpi_table_fadt *fadt;
if (!table)
return -EINVAL;
fadt_header = (struct acpi_table_header *)table;
if (fadt_header->revision != 3)
return -ENODEV; /* Only deal with ACPI 2.0 FADT */
fadt = (struct acpi_table_fadt *)fadt_header;
acpi_register_gsi(fadt->sci_interrupt, ACPI_LEVEL_SENSITIVE, ACPI_ACTIVE_LOW);
return 0;
}
int __init acpi_boot_init(void)
{
/*
* MADT
* ----
* Parse the Multiple APIC Description Table (MADT), if exists.
* Note that this table provides platform SMP configuration
* information -- the successor to MPS tables.
*/
if (acpi_table_parse(ACPI_SIG_MADT, acpi_parse_madt)) {
printk(KERN_ERR PREFIX "Can't find MADT\n");
goto skip_madt;
}
/* Local APIC */
if (acpi_table_parse_madt
(ACPI_MADT_TYPE_LOCAL_APIC_OVERRIDE, acpi_parse_lapic_addr_ovr, 0) < 0)
printk(KERN_ERR PREFIX
"Error parsing LAPIC address override entry\n");
if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_SAPIC, acpi_parse_lsapic, NR_CPUS)
< 1)
printk(KERN_ERR PREFIX
"Error parsing MADT - no LAPIC entries\n");
if (acpi_table_parse_madt(ACPI_MADT_TYPE_LOCAL_APIC_NMI, acpi_parse_lapic_nmi, 0)
< 0)
printk(KERN_ERR PREFIX "Error parsing LAPIC NMI entry\n");
/* I/O APIC */
if (acpi_table_parse_madt
(ACPI_MADT_TYPE_IO_SAPIC, acpi_parse_iosapic, NR_IOSAPICS) < 1) {
if (!ia64_platform_is("sn2"))
printk(KERN_ERR PREFIX
"Error parsing MADT - no IOSAPIC entries\n");
}
/* System-Level Interrupt Routing */
if (acpi_table_parse_madt
(ACPI_MADT_TYPE_INTERRUPT_SOURCE, acpi_parse_plat_int_src,
ACPI_MAX_PLATFORM_INTERRUPTS) < 0)
printk(KERN_ERR PREFIX
"Error parsing platform interrupt source entry\n");
if (acpi_table_parse_madt
(ACPI_MADT_TYPE_INTERRUPT_OVERRIDE, acpi_parse_int_src_ovr, 0) < 0)
printk(KERN_ERR PREFIX
"Error parsing interrupt source overrides entry\n");
if (acpi_table_parse_madt(ACPI_MADT_TYPE_NMI_SOURCE, acpi_parse_nmi_src, 0) < 0)
printk(KERN_ERR PREFIX "Error parsing NMI SRC entry\n");
skip_madt:
/*
* FADT says whether a legacy keyboard controller is present.
* The FADT also contains an SCI_INT line, by which the system
* gets interrupts such as power and sleep buttons. If it's not
* on a Legacy interrupt, it needs to be setup.
*/
if (acpi_table_parse(ACPI_SIG_FADT, acpi_parse_fadt))
printk(KERN_ERR PREFIX "Can't find FADT\n");
#ifdef CONFIG_SMP
if (available_cpus == 0) {
printk(KERN_INFO "ACPI: Found 0 CPUS; assuming 1\n");
printk(KERN_INFO "CPU 0 (0x%04x)", hard_smp_processor_id());
smp_boot_data.cpu_phys_id[available_cpus] =
hard_smp_processor_id();
available_cpus = 1; /* We've got at least one of these, no? */
}
smp_boot_data.cpu_count = available_cpus;
smp_build_cpu_map();
# ifdef CONFIG_ACPI_NUMA
if (srat_num_cpus == 0) {
int cpu, i = 1;
for (cpu = 0; cpu < smp_boot_data.cpu_count; cpu++)
if (smp_boot_data.cpu_phys_id[cpu] !=
hard_smp_processor_id())
node_cpuid[i++].phys_id =
smp_boot_data.cpu_phys_id[cpu];
}
# endif
#endif
#ifdef CONFIG_ACPI_NUMA
build_cpu_to_node_map();
#endif
/* Make boot-up look pretty */
printk(KERN_INFO "%d CPUs available, %d CPUs total\n", available_cpus,
total_cpus);
return 0;
}
int acpi_gsi_to_irq(u32 gsi, unsigned int *irq)
{
int tmp;
if (has_8259 && gsi < 16)
*irq = isa_irq_to_vector(gsi);
else {
tmp = gsi_to_irq(gsi);
if (tmp == -1)
return -1;
*irq = tmp;
}
return 0;
}
/*
* ACPI based hotplug CPU support
*/
#ifdef CONFIG_ACPI_HOTPLUG_CPU
static
int acpi_map_cpu2node(acpi_handle handle, int cpu, long physid)
{
#ifdef CONFIG_ACPI_NUMA
int pxm_id;
int nid;
pxm_id = acpi_get_pxm(handle);
/*
* We don't have cpu-only-node hotadd. But if the system equips
* SRAT table, pxm is already found and node is ready.
* So, just pxm_to_nid(pxm) is OK.
* This code here is for the system which doesn't have full SRAT
* table for possible cpus.
*/
nid = acpi_map_pxm_to_node(pxm_id);
node_cpuid[cpu].phys_id = physid;
node_cpuid[cpu].nid = nid;
#endif
return (0);
}
int additional_cpus __initdata = -1;
static __init int setup_additional_cpus(char *s)
{
if (s)
additional_cpus = simple_strtol(s, NULL, 0);
return 0;
}
early_param("additional_cpus", setup_additional_cpus);
/*
* cpu_possible_map should be static, it cannot change as CPUs
* are onlined, or offlined. The reason is per-cpu data-structures
* are allocated by some modules at init time, and dont expect to
* do this dynamically on cpu arrival/departure.
* cpu_present_map on the other hand can change dynamically.
* In case when cpu_hotplug is not compiled, then we resort to current
* behaviour, which is cpu_possible == cpu_present.
* - Ashok Raj
*
* Three ways to find out the number of additional hotplug CPUs:
* - If the BIOS specified disabled CPUs in ACPI/mptables use that.
* - The user can overwrite it with additional_cpus=NUM
* - Otherwise don't reserve additional CPUs.
*/
__init void prefill_possible_map(void)
{
int i;
int possible, disabled_cpus;
disabled_cpus = total_cpus - available_cpus;
if (additional_cpus == -1) {
if (disabled_cpus > 0)
additional_cpus = disabled_cpus;
else
additional_cpus = 0;
}
possible = available_cpus + additional_cpus;
if (possible > NR_CPUS)
possible = NR_CPUS;
printk(KERN_INFO "SMP: Allowing %d CPUs, %d hotplug CPUs\n",
possible, max((possible - available_cpus), 0));
for (i = 0; i < possible; i++)
cpu_set(i, cpu_possible_map);
}
int acpi_map_lsapic(acpi_handle handle, int *pcpu)
{
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
struct acpi_madt_local_sapic *lsapic;
cpumask_t tmp_map;
long physid;
int cpu;
if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
return -EINVAL;
if (!buffer.length || !buffer.pointer)
return -EINVAL;
obj = buffer.pointer;
if (obj->type != ACPI_TYPE_BUFFER)
{
kfree(buffer.pointer);
return -EINVAL;
}
lsapic = (struct acpi_madt_local_sapic *)obj->buffer.pointer;
if ((lsapic->header.type != ACPI_MADT_TYPE_LOCAL_SAPIC) ||
(!(lsapic->lapic_flags & ACPI_MADT_ENABLED))) {
kfree(buffer.pointer);
return -EINVAL;
}
physid = ((lsapic->id << 8) | (lsapic->eid));
kfree(buffer.pointer);
buffer.length = ACPI_ALLOCATE_BUFFER;
buffer.pointer = NULL;
cpus_complement(tmp_map, cpu_present_map);
cpu = first_cpu(tmp_map);
if (cpu >= NR_CPUS)
return -EINVAL;
acpi_map_cpu2node(handle, cpu, physid);
cpu_set(cpu, cpu_present_map);
ia64_cpu_to_sapicid[cpu] = physid;
*pcpu = cpu;
return (0);
}
EXPORT_SYMBOL(acpi_map_lsapic);
int acpi_unmap_lsapic(int cpu)
{
ia64_cpu_to_sapicid[cpu] = -1;
cpu_clear(cpu, cpu_present_map);
#ifdef CONFIG_ACPI_NUMA
/* NUMA specific cleanup's */
#endif
return (0);
}
EXPORT_SYMBOL(acpi_unmap_lsapic);
#endif /* CONFIG_ACPI_HOTPLUG_CPU */
#ifdef CONFIG_ACPI_NUMA
static acpi_status __devinit
acpi_map_iosapic(acpi_handle handle, u32 depth, void *context, void **ret)
{
struct acpi_buffer buffer = { ACPI_ALLOCATE_BUFFER, NULL };
union acpi_object *obj;
struct acpi_madt_io_sapic *iosapic;
unsigned int gsi_base;
int pxm, node;
/* Only care about objects w/ a method that returns the MADT */
if (ACPI_FAILURE(acpi_evaluate_object(handle, "_MAT", NULL, &buffer)))
return AE_OK;
if (!buffer.length || !buffer.pointer)
return AE_OK;
obj = buffer.pointer;
if (obj->type != ACPI_TYPE_BUFFER ||
obj->buffer.length < sizeof(*iosapic)) {
kfree(buffer.pointer);
return AE_OK;
}
iosapic = (struct acpi_madt_io_sapic *)obj->buffer.pointer;
if (iosapic->header.type != ACPI_MADT_TYPE_IO_SAPIC) {
kfree(buffer.pointer);
return AE_OK;
}
gsi_base = iosapic->global_irq_base;
kfree(buffer.pointer);
/*
* OK, it's an IOSAPIC MADT entry, look for a _PXM value to tell
* us which node to associate this with.
*/
pxm = acpi_get_pxm(handle);
if (pxm < 0)
return AE_OK;
node = pxm_to_node(pxm);
if (node >= MAX_NUMNODES || !node_online(node) ||
cpus_empty(node_to_cpumask(node)))
return AE_OK;
/* We know a gsi to node mapping! */
map_iosapic_to_node(gsi_base, node);
return AE_OK;
}
static int __init
acpi_map_iosapics (void)
{
acpi_get_devices(NULL, acpi_map_iosapic, NULL, NULL);
return 0;
}
fs_initcall(acpi_map_iosapics);
#endif /* CONFIG_ACPI_NUMA */
int __ref acpi_register_ioapic(acpi_handle handle, u64 phys_addr, u32 gsi_base)
{
int err;
if ((err = iosapic_init(phys_addr, gsi_base)))
return err;
#ifdef CONFIG_ACPI_NUMA
acpi_map_iosapic(handle, 0, NULL, NULL);
#endif /* CONFIG_ACPI_NUMA */
return 0;
}
EXPORT_SYMBOL(acpi_register_ioapic);
int acpi_unregister_ioapic(acpi_handle handle, u32 gsi_base)
{
return iosapic_remove(gsi_base);
}
EXPORT_SYMBOL(acpi_unregister_ioapic);
/*
* acpi_save_state_mem() - save kernel state
*
* TBD when when IA64 starts to support suspend...
*/
int acpi_save_state_mem(void) { return 0; }
/*
* acpi_restore_state()
*/
void acpi_restore_state_mem(void) {}
/*
* do_suspend_lowlevel()
*/
void do_suspend_lowlevel(void) {}
#endif /* CONFIG_ACPI */
