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linux/arch/i386/kernel/mpparse.c
Natalie Protasevich c434b7a6ae [PATCH] x86: avoid wasting IRQs for PCI devices 
I have submitted the patch for x86_64, this is submission for i386.

The patch changes the way IRQs are handed out to PCI devices.  Currently,
each I/O APIC pin gets associated with an IRQ, no matter if the pin is used
or not.  This imposes severe limitation on systems that have designs that
employ many I/O APICs, only utilizing couple lines of each, such as P64H2
chipset.  It is used in ES7000, and currently, there is no way to boot the
system with more that 9 I/O APICs.

The simple change below allows to boot a system with say 64 (or more) I/O
APICs, each providing 1 slot, which otherwise impossible because of the IRQ
gaps created for unused lines on each I/O APIC.  It does not resolve the
problem with number of devices that exceeds number of possible IRQs, but
eases up a tension for IRQs on any large system with potentually large
number of devices.

Signed-off-by: Natalie Protasevich <Natalie.Protasevich@unisys.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
2005-06-23 09:45:10 -07:00

1137 lines
30 KiB
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/*
* Intel Multiprocessor Specification 1.1 and 1.4
* compliant MP-table parsing routines.
*
* (c) 1995 Alan Cox, Building #3 <alan@redhat.com>
* (c) 1998, 1999, 2000 Ingo Molnar <mingo@redhat.com>
*
* Fixes
* Erich Boleyn : MP v1.4 and additional changes.
* Alan Cox : Added EBDA scanning
* Ingo Molnar : various cleanups and rewrites
* Maciej W. Rozycki: Bits for default MP configurations
* Paul Diefenbaugh: Added full ACPI support
*/
#include <linux/mm.h>
#include <linux/irq.h>
#include <linux/init.h>
#include <linux/acpi.h>
#include <linux/delay.h>
#include <linux/config.h>
#include <linux/bootmem.h>
#include <linux/smp_lock.h>
#include <linux/kernel_stat.h>
#include <linux/mc146818rtc.h>
#include <linux/bitops.h>
#include <asm/smp.h>
#include <asm/acpi.h>
#include <asm/mtrr.h>
#include <asm/mpspec.h>
#include <asm/io_apic.h>
#include <mach_apic.h>
#include <mach_mpparse.h>
#include <bios_ebda.h>
/* Have we found an MP table */
int smp_found_config;
unsigned int __initdata maxcpus = NR_CPUS;
/*
* Various Linux-internal data structures created from the
* MP-table.
*/
int apic_version [MAX_APICS];
int mp_bus_id_to_type [MAX_MP_BUSSES];
int mp_bus_id_to_node [MAX_MP_BUSSES];
int mp_bus_id_to_local [MAX_MP_BUSSES];
int quad_local_to_mp_bus_id [NR_CPUS/4][4];
int mp_bus_id_to_pci_bus [MAX_MP_BUSSES] = { [0 ... MAX_MP_BUSSES-1] = -1 };
static int mp_current_pci_id;
/* I/O APIC entries */
struct mpc_config_ioapic mp_ioapics[MAX_IO_APICS];
/* # of MP IRQ source entries */
struct mpc_config_intsrc mp_irqs[MAX_IRQ_SOURCES];
/* MP IRQ source entries */
int mp_irq_entries;
int nr_ioapics;
int pic_mode;
unsigned long mp_lapic_addr;
/* Processor that is doing the boot up */
unsigned int boot_cpu_physical_apicid = -1U;
unsigned int boot_cpu_logical_apicid = -1U;
/* Internal processor count */
static unsigned int __initdata num_processors;
/* Bitmask of physically existing CPUs */
physid_mask_t phys_cpu_present_map;
u8 bios_cpu_apicid[NR_CPUS] = { [0 ... NR_CPUS-1] = BAD_APICID };
/*
* Intel MP BIOS table parsing routines:
*/
/*
* Checksum an MP configuration block.
*/
static int __init mpf_checksum(unsigned char *mp, int len)
{
int sum = 0;
while (len--)
sum += *mp++;
return sum & 0xFF;
}
/*
* Have to match translation table entries to main table entries by counter
* hence the mpc_record variable .... can't see a less disgusting way of
* doing this ....
*/
static int mpc_record;
static struct mpc_config_translation *translation_table[MAX_MPC_ENTRY] __initdata;
#ifdef CONFIG_X86_NUMAQ
static int MP_valid_apicid(int apicid, int version)
{
return hweight_long(apicid & 0xf) == 1 && (apicid >> 4) != 0xf;
}
#else
static int MP_valid_apicid(int apicid, int version)
{
if (version >= 0x14)
return apicid < 0xff;
else
return apicid < 0xf;
}
#endif
static void __init MP_processor_info (struct mpc_config_processor *m)
{
int ver, apicid;
physid_mask_t tmp;
if (!(m->mpc_cpuflag & CPU_ENABLED))
return;
apicid = mpc_apic_id(m, translation_table[mpc_record]);
if (m->mpc_featureflag&(1<<0))
Dprintk(" Floating point unit present.\n");
if (m->mpc_featureflag&(1<<7))
Dprintk(" Machine Exception supported.\n");
if (m->mpc_featureflag&(1<<8))
Dprintk(" 64 bit compare & exchange supported.\n");
if (m->mpc_featureflag&(1<<9))
Dprintk(" Internal APIC present.\n");
if (m->mpc_featureflag&(1<<11))
Dprintk(" SEP present.\n");
if (m->mpc_featureflag&(1<<12))
Dprintk(" MTRR present.\n");
if (m->mpc_featureflag&(1<<13))
Dprintk(" PGE present.\n");
if (m->mpc_featureflag&(1<<14))
Dprintk(" MCA present.\n");
if (m->mpc_featureflag&(1<<15))
Dprintk(" CMOV present.\n");
if (m->mpc_featureflag&(1<<16))
Dprintk(" PAT present.\n");
if (m->mpc_featureflag&(1<<17))
Dprintk(" PSE present.\n");
if (m->mpc_featureflag&(1<<18))
Dprintk(" PSN present.\n");
if (m->mpc_featureflag&(1<<19))
Dprintk(" Cache Line Flush Instruction present.\n");
/* 20 Reserved */
if (m->mpc_featureflag&(1<<21))
Dprintk(" Debug Trace and EMON Store present.\n");
if (m->mpc_featureflag&(1<<22))
Dprintk(" ACPI Thermal Throttle Registers present.\n");
if (m->mpc_featureflag&(1<<23))
Dprintk(" MMX present.\n");
if (m->mpc_featureflag&(1<<24))
Dprintk(" FXSR present.\n");
if (m->mpc_featureflag&(1<<25))
Dprintk(" XMM present.\n");
if (m->mpc_featureflag&(1<<26))
Dprintk(" Willamette New Instructions present.\n");
if (m->mpc_featureflag&(1<<27))
Dprintk(" Self Snoop present.\n");
if (m->mpc_featureflag&(1<<28))
Dprintk(" HT present.\n");
if (m->mpc_featureflag&(1<<29))
Dprintk(" Thermal Monitor present.\n");
/* 30, 31 Reserved */
if (m->mpc_cpuflag & CPU_BOOTPROCESSOR) {
Dprintk(" Bootup CPU\n");
boot_cpu_physical_apicid = m->mpc_apicid;
boot_cpu_logical_apicid = apicid;
}
if (num_processors >= NR_CPUS) {
printk(KERN_WARNING "WARNING: NR_CPUS limit of %i reached."
" Processor ignored.\n", NR_CPUS);
return;
}
if (num_processors >= maxcpus) {
printk(KERN_WARNING "WARNING: maxcpus limit of %i reached."
" Processor ignored.\n", maxcpus);
return;
}
num_processors++;
ver = m->mpc_apicver;
if (!MP_valid_apicid(apicid, ver)) {
printk(KERN_WARNING "Processor #%d INVALID. (Max ID: %d).\n",
m->mpc_apicid, MAX_APICS);
--num_processors;
return;
}
tmp = apicid_to_cpu_present(apicid);
physids_or(phys_cpu_present_map, phys_cpu_present_map, tmp);
/*
* Validate version
*/
if (ver == 0x0) {
printk(KERN_WARNING "BIOS bug, APIC version is 0 for CPU#%d! fixing up to 0x10. (tell your hw vendor)\n", m->mpc_apicid);
ver = 0x10;
}
apic_version[m->mpc_apicid] = ver;
bios_cpu_apicid[num_processors - 1] = m->mpc_apicid;
}
static void __init MP_bus_info (struct mpc_config_bus *m)
{
char str[7];
memcpy(str, m->mpc_bustype, 6);
str[6] = 0;
mpc_oem_bus_info(m, str, translation_table[mpc_record]);
if (strncmp(str, BUSTYPE_ISA, sizeof(BUSTYPE_ISA)-1) == 0) {
mp_bus_id_to_type[m->mpc_busid] = MP_BUS_ISA;
} else if (strncmp(str, BUSTYPE_EISA, sizeof(BUSTYPE_EISA)-1) == 0) {
mp_bus_id_to_type[m->mpc_busid] = MP_BUS_EISA;
} else if (strncmp(str, BUSTYPE_PCI, sizeof(BUSTYPE_PCI)-1) == 0) {
mpc_oem_pci_bus(m, translation_table[mpc_record]);
mp_bus_id_to_type[m->mpc_busid] = MP_BUS_PCI;
mp_bus_id_to_pci_bus[m->mpc_busid] = mp_current_pci_id;
mp_current_pci_id++;
} else if (strncmp(str, BUSTYPE_MCA, sizeof(BUSTYPE_MCA)-1) == 0) {
mp_bus_id_to_type[m->mpc_busid] = MP_BUS_MCA;
} else if (strncmp(str, BUSTYPE_NEC98, sizeof(BUSTYPE_NEC98)-1) == 0) {
mp_bus_id_to_type[m->mpc_busid] = MP_BUS_NEC98;
} else {
printk(KERN_WARNING "Unknown bustype %s - ignoring\n", str);
}
}
static void __init MP_ioapic_info (struct mpc_config_ioapic *m)
{
if (!(m->mpc_flags & MPC_APIC_USABLE))
return;
printk(KERN_INFO "I/O APIC #%d Version %d at 0x%lX.\n",
m->mpc_apicid, m->mpc_apicver, m->mpc_apicaddr);
if (nr_ioapics >= MAX_IO_APICS) {
printk(KERN_CRIT "Max # of I/O APICs (%d) exceeded (found %d).\n",
MAX_IO_APICS, nr_ioapics);
panic("Recompile kernel with bigger MAX_IO_APICS!.\n");
}
if (!m->mpc_apicaddr) {
printk(KERN_ERR "WARNING: bogus zero I/O APIC address"
" found in MP table, skipping!\n");
return;
}
mp_ioapics[nr_ioapics] = *m;
nr_ioapics++;
}
static void __init MP_intsrc_info (struct mpc_config_intsrc *m)
{
mp_irqs [mp_irq_entries] = *m;
Dprintk("Int: type %d, pol %d, trig %d, bus %d,"
" IRQ %02x, APIC ID %x, APIC INT %02x\n",
m->mpc_irqtype, m->mpc_irqflag & 3,
(m->mpc_irqflag >> 2) & 3, m->mpc_srcbus,
m->mpc_srcbusirq, m->mpc_dstapic, m->mpc_dstirq);
if (++mp_irq_entries == MAX_IRQ_SOURCES)
panic("Max # of irq sources exceeded!!\n");
}
static void __init MP_lintsrc_info (struct mpc_config_lintsrc *m)
{
Dprintk("Lint: type %d, pol %d, trig %d, bus %d,"
" IRQ %02x, APIC ID %x, APIC LINT %02x\n",
m->mpc_irqtype, m->mpc_irqflag & 3,
(m->mpc_irqflag >> 2) &3, m->mpc_srcbusid,
m->mpc_srcbusirq, m->mpc_destapic, m->mpc_destapiclint);
/*
* Well it seems all SMP boards in existence
* use ExtINT/LVT1 == LINT0 and
* NMI/LVT2 == LINT1 - the following check
* will show us if this assumptions is false.
* Until then we do not have to add baggage.
*/
if ((m->mpc_irqtype == mp_ExtINT) &&
(m->mpc_destapiclint != 0))
BUG();
if ((m->mpc_irqtype == mp_NMI) &&
(m->mpc_destapiclint != 1))
BUG();
}
#ifdef CONFIG_X86_NUMAQ
static void __init MP_translation_info (struct mpc_config_translation *m)
{
printk(KERN_INFO "Translation: record %d, type %d, quad %d, global %d, local %d\n", mpc_record, m->trans_type, m->trans_quad, m->trans_global, m->trans_local);
if (mpc_record >= MAX_MPC_ENTRY)
printk(KERN_ERR "MAX_MPC_ENTRY exceeded!\n");
else
translation_table[mpc_record] = m; /* stash this for later */
if (m->trans_quad < MAX_NUMNODES && !node_online(m->trans_quad))
node_set_online(m->trans_quad);
}
/*
* Read/parse the MPC oem tables
*/
static void __init smp_read_mpc_oem(struct mp_config_oemtable *oemtable, \
unsigned short oemsize)
{
int count = sizeof (*oemtable); /* the header size */
unsigned char *oemptr = ((unsigned char *)oemtable)+count;
mpc_record = 0;
printk(KERN_INFO "Found an OEM MPC table at %8p - parsing it ... \n", oemtable);
if (memcmp(oemtable->oem_signature,MPC_OEM_SIGNATURE,4))
{
printk(KERN_WARNING "SMP mpc oemtable: bad signature [%c%c%c%c]!\n",
oemtable->oem_signature[0],
oemtable->oem_signature[1],
oemtable->oem_signature[2],
oemtable->oem_signature[3]);
return;
}
if (mpf_checksum((unsigned char *)oemtable,oemtable->oem_length))
{
printk(KERN_WARNING "SMP oem mptable: checksum error!\n");
return;
}
while (count < oemtable->oem_length) {
switch (*oemptr) {
case MP_TRANSLATION:
{
struct mpc_config_translation *m=
(struct mpc_config_translation *)oemptr;
MP_translation_info(m);
oemptr += sizeof(*m);
count += sizeof(*m);
++mpc_record;
break;
}
default:
{
printk(KERN_WARNING "Unrecognised OEM table entry type! - %d\n", (int) *oemptr);
return;
}
}
}
}
static inline void mps_oem_check(struct mp_config_table *mpc, char *oem,
char *productid)
{
if (strncmp(oem, "IBM NUMA", 8))
printk("Warning! May not be a NUMA-Q system!\n");
if (mpc->mpc_oemptr)
smp_read_mpc_oem((struct mp_config_oemtable *) mpc->mpc_oemptr,
mpc->mpc_oemsize);
}
#endif /* CONFIG_X86_NUMAQ */
/*
* Read/parse the MPC
*/
static int __init smp_read_mpc(struct mp_config_table *mpc)
{
char str[16];
char oem[10];
int count=sizeof(*mpc);
unsigned char *mpt=((unsigned char *)mpc)+count;
if (memcmp(mpc->mpc_signature,MPC_SIGNATURE,4)) {
printk(KERN_ERR "SMP mptable: bad signature [0x%x]!\n",
*(u32 *)mpc->mpc_signature);
return 0;
}
if (mpf_checksum((unsigned char *)mpc,mpc->mpc_length)) {
printk(KERN_ERR "SMP mptable: checksum error!\n");
return 0;
}
if (mpc->mpc_spec!=0x01 && mpc->mpc_spec!=0x04) {
printk(KERN_ERR "SMP mptable: bad table version (%d)!!\n",
mpc->mpc_spec);
return 0;
}
if (!mpc->mpc_lapic) {
printk(KERN_ERR "SMP mptable: null local APIC address!\n");
return 0;
}
memcpy(oem,mpc->mpc_oem,8);
oem[8]=0;
printk(KERN_INFO "OEM ID: %s ",oem);
memcpy(str,mpc->mpc_productid,12);
str[12]=0;
printk("Product ID: %s ",str);
mps_oem_check(mpc, oem, str);
printk("APIC at: 0x%lX\n",mpc->mpc_lapic);
/*
* Save the local APIC address (it might be non-default) -- but only
* if we're not using ACPI.
*/
if (!acpi_lapic)
mp_lapic_addr = mpc->mpc_lapic;
/*
* Now process the configuration blocks.
*/
mpc_record = 0;
while (count < mpc->mpc_length) {
switch(*mpt) {
case MP_PROCESSOR:
{
struct mpc_config_processor *m=
(struct mpc_config_processor *)mpt;
/* ACPI may have already provided this data */
if (!acpi_lapic)
MP_processor_info(m);
mpt += sizeof(*m);
count += sizeof(*m);
break;
}
case MP_BUS:
{
struct mpc_config_bus *m=
(struct mpc_config_bus *)mpt;
MP_bus_info(m);
mpt += sizeof(*m);
count += sizeof(*m);
break;
}
case MP_IOAPIC:
{
struct mpc_config_ioapic *m=
(struct mpc_config_ioapic *)mpt;
MP_ioapic_info(m);
mpt+=sizeof(*m);
count+=sizeof(*m);
break;
}
case MP_INTSRC:
{
struct mpc_config_intsrc *m=
(struct mpc_config_intsrc *)mpt;
MP_intsrc_info(m);
mpt+=sizeof(*m);
count+=sizeof(*m);
break;
}
case MP_LINTSRC:
{
struct mpc_config_lintsrc *m=
(struct mpc_config_lintsrc *)mpt;
MP_lintsrc_info(m);
mpt+=sizeof(*m);
count+=sizeof(*m);
break;
}
default:
{
count = mpc->mpc_length;
break;
}
}
++mpc_record;
}
clustered_apic_check();
if (!num_processors)
printk(KERN_ERR "SMP mptable: no processors registered!\n");
return num_processors;
}
static int __init ELCR_trigger(unsigned int irq)
{
unsigned int port;
port = 0x4d0 + (irq >> 3);
return (inb(port) >> (irq & 7)) & 1;
}
static void __init construct_default_ioirq_mptable(int mpc_default_type)
{
struct mpc_config_intsrc intsrc;
int i;
int ELCR_fallback = 0;
intsrc.mpc_type = MP_INTSRC;
intsrc.mpc_irqflag = 0; /* conforming */
intsrc.mpc_srcbus = 0;
intsrc.mpc_dstapic = mp_ioapics[0].mpc_apicid;
intsrc.mpc_irqtype = mp_INT;
/*
* If true, we have an ISA/PCI system with no IRQ entries
* in the MP table. To prevent the PCI interrupts from being set up
* incorrectly, we try to use the ELCR. The sanity check to see if
* there is good ELCR data is very simple - IRQ0, 1, 2 and 13 can
* never be level sensitive, so we simply see if the ELCR agrees.
* If it does, we assume it's valid.
*/
if (mpc_default_type == 5) {
printk(KERN_INFO "ISA/PCI bus type with no IRQ information... falling back to ELCR\n");
if (ELCR_trigger(0) || ELCR_trigger(1) || ELCR_trigger(2) || ELCR_trigger(13))
printk(KERN_WARNING "ELCR contains invalid data... not using ELCR\n");
else {
printk(KERN_INFO "Using ELCR to identify PCI interrupts\n");
ELCR_fallback = 1;
}
}
for (i = 0; i < 16; i++) {
switch (mpc_default_type) {
case 2:
if (i == 0 || i == 13)
continue; /* IRQ0 & IRQ13 not connected */
/* fall through */
default:
if (i == 2)
continue; /* IRQ2 is never connected */
}
if (ELCR_fallback) {
/*
* If the ELCR indicates a level-sensitive interrupt, we
* copy that information over to the MP table in the
* irqflag field (level sensitive, active high polarity).
*/
if (ELCR_trigger(i))
intsrc.mpc_irqflag = 13;
else
intsrc.mpc_irqflag = 0;
}
intsrc.mpc_srcbusirq = i;
intsrc.mpc_dstirq = i ? i : 2; /* IRQ0 to INTIN2 */
MP_intsrc_info(&intsrc);
}
intsrc.mpc_irqtype = mp_ExtINT;
intsrc.mpc_srcbusirq = 0;
intsrc.mpc_dstirq = 0; /* 8259A to INTIN0 */
MP_intsrc_info(&intsrc);
}
static inline void __init construct_default_ISA_mptable(int mpc_default_type)
{
struct mpc_config_processor processor;
struct mpc_config_bus bus;
struct mpc_config_ioapic ioapic;
struct mpc_config_lintsrc lintsrc;
int linttypes[2] = { mp_ExtINT, mp_NMI };
int i;
/*
* local APIC has default address
*/
mp_lapic_addr = APIC_DEFAULT_PHYS_BASE;
/*
* 2 CPUs, numbered 0 & 1.
*/
processor.mpc_type = MP_PROCESSOR;
/* Either an integrated APIC or a discrete 82489DX. */
processor.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
processor.mpc_cpuflag = CPU_ENABLED;
processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
(boot_cpu_data.x86_model << 4) |
boot_cpu_data.x86_mask;
processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
processor.mpc_reserved[0] = 0;
processor.mpc_reserved[1] = 0;
for (i = 0; i < 2; i++) {
processor.mpc_apicid = i;
MP_processor_info(&processor);
}
bus.mpc_type = MP_BUS;
bus.mpc_busid = 0;
switch (mpc_default_type) {
default:
printk("???\n");
printk(KERN_ERR "Unknown standard configuration %d\n",
mpc_default_type);
/* fall through */
case 1:
case 5:
memcpy(bus.mpc_bustype, "ISA ", 6);
break;
case 2:
case 6:
case 3:
memcpy(bus.mpc_bustype, "EISA ", 6);
break;
case 4:
case 7:
memcpy(bus.mpc_bustype, "MCA ", 6);
}
MP_bus_info(&bus);
if (mpc_default_type > 4) {
bus.mpc_busid = 1;
memcpy(bus.mpc_bustype, "PCI ", 6);
MP_bus_info(&bus);
}
ioapic.mpc_type = MP_IOAPIC;
ioapic.mpc_apicid = 2;
ioapic.mpc_apicver = mpc_default_type > 4 ? 0x10 : 0x01;
ioapic.mpc_flags = MPC_APIC_USABLE;
ioapic.mpc_apicaddr = 0xFEC00000;
MP_ioapic_info(&ioapic);
/*
* We set up most of the low 16 IO-APIC pins according to MPS rules.
*/
construct_default_ioirq_mptable(mpc_default_type);
lintsrc.mpc_type = MP_LINTSRC;
lintsrc.mpc_irqflag = 0; /* conforming */
lintsrc.mpc_srcbusid = 0;
lintsrc.mpc_srcbusirq = 0;
lintsrc.mpc_destapic = MP_APIC_ALL;
for (i = 0; i < 2; i++) {
lintsrc.mpc_irqtype = linttypes[i];
lintsrc.mpc_destapiclint = i;
MP_lintsrc_info(&lintsrc);
}
}
static struct intel_mp_floating *mpf_found;
/*
* Scan the memory blocks for an SMP configuration block.
*/
void __init get_smp_config (void)
{
struct intel_mp_floating *mpf = mpf_found;
/*
* ACPI may be used to obtain the entire SMP configuration or just to
* enumerate/configure processors (CONFIG_ACPI_BOOT). Note that
* ACPI supports both logical (e.g. Hyper-Threading) and physical
* processors, where MPS only supports physical.
*/
if (acpi_lapic && acpi_ioapic) {
printk(KERN_INFO "Using ACPI (MADT) for SMP configuration information\n");
return;
}
else if (acpi_lapic)
printk(KERN_INFO "Using ACPI for processor (LAPIC) configuration information\n");
printk(KERN_INFO "Intel MultiProcessor Specification v1.%d\n", mpf->mpf_specification);
if (mpf->mpf_feature2 & (1<<7)) {
printk(KERN_INFO " IMCR and PIC compatibility mode.\n");
pic_mode = 1;
} else {
printk(KERN_INFO " Virtual Wire compatibility mode.\n");
pic_mode = 0;
}
/*
* Now see if we need to read further.
*/
if (mpf->mpf_feature1 != 0) {
printk(KERN_INFO "Default MP configuration #%d\n", mpf->mpf_feature1);
construct_default_ISA_mptable(mpf->mpf_feature1);
} else if (mpf->mpf_physptr) {
/*
* Read the physical hardware table. Anything here will
* override the defaults.
*/
if (!smp_read_mpc((void *)mpf->mpf_physptr)) {
smp_found_config = 0;
printk(KERN_ERR "BIOS bug, MP table errors detected!...\n");
printk(KERN_ERR "... disabling SMP support. (tell your hw vendor)\n");
return;
}
/*
* If there are no explicit MP IRQ entries, then we are
* broken. We set up most of the low 16 IO-APIC pins to
* ISA defaults and hope it will work.
*/
if (!mp_irq_entries) {
struct mpc_config_bus bus;
printk(KERN_ERR "BIOS bug, no explicit IRQ entries, using default mptable. (tell your hw vendor)\n");
bus.mpc_type = MP_BUS;
bus.mpc_busid = 0;
memcpy(bus.mpc_bustype, "ISA ", 6);
MP_bus_info(&bus);
construct_default_ioirq_mptable(0);
}
} else
BUG();
printk(KERN_INFO "Processors: %d\n", num_processors);
/*
* Only use the first configuration found.
*/
}
static int __init smp_scan_config (unsigned long base, unsigned long length)
{
unsigned long *bp = phys_to_virt(base);
struct intel_mp_floating *mpf;
Dprintk("Scan SMP from %p for %ld bytes.\n", bp,length);
if (sizeof(*mpf) != 16)
printk("Error: MPF size\n");
while (length > 0) {
mpf = (struct intel_mp_floating *)bp;
if ((*bp == SMP_MAGIC_IDENT) &&
(mpf->mpf_length == 1) &&
!mpf_checksum((unsigned char *)bp, 16) &&
((mpf->mpf_specification == 1)
|| (mpf->mpf_specification == 4)) ) {
smp_found_config = 1;
printk(KERN_INFO "found SMP MP-table at %08lx\n",
virt_to_phys(mpf));
reserve_bootmem(virt_to_phys(mpf), PAGE_SIZE);
if (mpf->mpf_physptr) {
/*
* We cannot access to MPC table to compute
* table size yet, as only few megabytes from
* the bottom is mapped now.
* PC-9800's MPC table places on the very last
* of physical memory; so that simply reserving
* PAGE_SIZE from mpg->mpf_physptr yields BUG()
* in reserve_bootmem.
*/
unsigned long size = PAGE_SIZE;
unsigned long end = max_low_pfn * PAGE_SIZE;
if (mpf->mpf_physptr + size > end)
size = end - mpf->mpf_physptr;
reserve_bootmem(mpf->mpf_physptr, size);
}
mpf_found = mpf;
return 1;
}
bp += 4;
length -= 16;
}
return 0;
}
void __init find_smp_config (void)
{
unsigned int address;
/*
* FIXME: Linux assumes you have 640K of base ram..
* this continues the error...
*
* 1) Scan the bottom 1K for a signature
* 2) Scan the top 1K of base RAM
* 3) Scan the 64K of bios
*/
if (smp_scan_config(0x0,0x400) ||
smp_scan_config(639*0x400,0x400) ||
smp_scan_config(0xF0000,0x10000))
return;
/*
* If it is an SMP machine we should know now, unless the
* configuration is in an EISA/MCA bus machine with an
* extended bios data area.
*
* there is a real-mode segmented pointer pointing to the
* 4K EBDA area at 0x40E, calculate and scan it here.
*
* NOTE! There are Linux loaders that will corrupt the EBDA
* area, and as such this kind of SMP config may be less
* trustworthy, simply because the SMP table may have been
* stomped on during early boot. These loaders are buggy and
* should be fixed.
*
* MP1.4 SPEC states to only scan first 1K of 4K EBDA.
*/
address = get_bios_ebda();
if (address)
smp_scan_config(address, 0x400);
}
/* --------------------------------------------------------------------------
ACPI-based MP Configuration
-------------------------------------------------------------------------- */
#ifdef CONFIG_ACPI_BOOT
void __init mp_register_lapic_address (
u64 address)
{
mp_lapic_addr = (unsigned long) address;
set_fixmap_nocache(FIX_APIC_BASE, mp_lapic_addr);
if (boot_cpu_physical_apicid == -1U)
boot_cpu_physical_apicid = GET_APIC_ID(apic_read(APIC_ID));
Dprintk("Boot CPU = %d\n", boot_cpu_physical_apicid);
}
void __init mp_register_lapic (
u8 id,
u8 enabled)
{
struct mpc_config_processor processor;
int boot_cpu = 0;
if (MAX_APICS - id <= 0) {
printk(KERN_WARNING "Processor #%d invalid (max %d)\n",
id, MAX_APICS);
return;
}
if (id == boot_cpu_physical_apicid)
boot_cpu = 1;
processor.mpc_type = MP_PROCESSOR;
processor.mpc_apicid = id;
processor.mpc_apicver = GET_APIC_VERSION(apic_read(APIC_LVR));
processor.mpc_cpuflag = (enabled ? CPU_ENABLED : 0);
processor.mpc_cpuflag |= (boot_cpu ? CPU_BOOTPROCESSOR : 0);
processor.mpc_cpufeature = (boot_cpu_data.x86 << 8) |
(boot_cpu_data.x86_model << 4) | boot_cpu_data.x86_mask;
processor.mpc_featureflag = boot_cpu_data.x86_capability[0];
processor.mpc_reserved[0] = 0;
processor.mpc_reserved[1] = 0;
MP_processor_info(&processor);
}
#if defined(CONFIG_X86_IO_APIC) && (defined(CONFIG_ACPI_INTERPRETER) || defined(CONFIG_ACPI_BOOT))
#define MP_ISA_BUS 0
#define MP_MAX_IOAPIC_PIN 127
static struct mp_ioapic_routing {
int apic_id;
int gsi_base;
int gsi_end;
u32 pin_programmed[4];
} mp_ioapic_routing[MAX_IO_APICS];
static int mp_find_ioapic (
int gsi)
{
int i = 0;
/* Find the IOAPIC that manages this GSI. */
for (i = 0; i < nr_ioapics; i++) {
if ((gsi >= mp_ioapic_routing[i].gsi_base)
&& (gsi <= mp_ioapic_routing[i].gsi_end))
return i;
}
printk(KERN_ERR "ERROR: Unable to locate IOAPIC for GSI %d\n", gsi);
return -1;
}
void __init mp_register_ioapic (
u8 id,
u32 address,
u32 gsi_base)
{
int idx = 0;
if (nr_ioapics >= MAX_IO_APICS) {
printk(KERN_ERR "ERROR: Max # of I/O APICs (%d) exceeded "
"(found %d)\n", MAX_IO_APICS, nr_ioapics);
panic("Recompile kernel with bigger MAX_IO_APICS!\n");
}
if (!address) {
printk(KERN_ERR "WARNING: Bogus (zero) I/O APIC address"
" found in MADT table, skipping!\n");
return;
}
idx = nr_ioapics++;
mp_ioapics[idx].mpc_type = MP_IOAPIC;
mp_ioapics[idx].mpc_flags = MPC_APIC_USABLE;
mp_ioapics[idx].mpc_apicaddr = address;
set_fixmap_nocache(FIX_IO_APIC_BASE_0 + idx, address);
if ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL) && (boot_cpu_data.x86 < 15))
mp_ioapics[idx].mpc_apicid = io_apic_get_unique_id(idx, id);
else
mp_ioapics[idx].mpc_apicid = id;
mp_ioapics[idx].mpc_apicver = io_apic_get_version(idx);
/*
* Build basic GSI lookup table to facilitate gsi->io_apic lookups
* and to prevent reprogramming of IOAPIC pins (PCI GSIs).
*/
mp_ioapic_routing[idx].apic_id = mp_ioapics[idx].mpc_apicid;
mp_ioapic_routing[idx].gsi_base = gsi_base;
mp_ioapic_routing[idx].gsi_end = gsi_base +
io_apic_get_redir_entries(idx);
printk("IOAPIC[%d]: apic_id %d, version %d, address 0x%lx, "
"GSI %d-%d\n", idx, mp_ioapics[idx].mpc_apicid,
mp_ioapics[idx].mpc_apicver, mp_ioapics[idx].mpc_apicaddr,
mp_ioapic_routing[idx].gsi_base,
mp_ioapic_routing[idx].gsi_end);
return;
}
void __init mp_override_legacy_irq (
u8 bus_irq,
u8 polarity,
u8 trigger,
u32 gsi)
{
struct mpc_config_intsrc intsrc;
int ioapic = -1;
int pin = -1;
/*
* Convert 'gsi' to 'ioapic.pin'.
*/
ioapic = mp_find_ioapic(gsi);
if (ioapic < 0)
return;
pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
/*
* TBD: This check is for faulty timer entries, where the override
* erroneously sets the trigger to level, resulting in a HUGE
* increase of timer interrupts!
*/
if ((bus_irq == 0) && (trigger == 3))
trigger = 1;
intsrc.mpc_type = MP_INTSRC;
intsrc.mpc_irqtype = mp_INT;
intsrc.mpc_irqflag = (trigger << 2) | polarity;
intsrc.mpc_srcbus = MP_ISA_BUS;
intsrc.mpc_srcbusirq = bus_irq; /* IRQ */
intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid; /* APIC ID */
intsrc.mpc_dstirq = pin; /* INTIN# */
Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, %d-%d\n",
intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
(intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
intsrc.mpc_srcbusirq, intsrc.mpc_dstapic, intsrc.mpc_dstirq);
mp_irqs[mp_irq_entries] = intsrc;
if (++mp_irq_entries == MAX_IRQ_SOURCES)
panic("Max # of irq sources exceeded!\n");
return;
}
int es7000_plat;
void __init mp_config_acpi_legacy_irqs (void)
{
struct mpc_config_intsrc intsrc;
int i = 0;
int ioapic = -1;
/*
* Fabricate the legacy ISA bus (bus #31).
*/
mp_bus_id_to_type[MP_ISA_BUS] = MP_BUS_ISA;
Dprintk("Bus #%d is ISA\n", MP_ISA_BUS);
/*
* Older generations of ES7000 have no legacy identity mappings
*/
if (es7000_plat == 1)
return;
/*
* Locate the IOAPIC that manages the ISA IRQs (0-15).
*/
ioapic = mp_find_ioapic(0);
if (ioapic < 0)
return;
intsrc.mpc_type = MP_INTSRC;
intsrc.mpc_irqflag = 0; /* Conforming */
intsrc.mpc_srcbus = MP_ISA_BUS;
intsrc.mpc_dstapic = mp_ioapics[ioapic].mpc_apicid;
/*
* Use the default configuration for the IRQs 0-15. Unless
* overriden by (MADT) interrupt source override entries.
*/
for (i = 0; i < 16; i++) {
int idx;
for (idx = 0; idx < mp_irq_entries; idx++) {
struct mpc_config_intsrc *irq = mp_irqs + idx;
/* Do we already have a mapping for this ISA IRQ? */
if (irq->mpc_srcbus == MP_ISA_BUS && irq->mpc_srcbusirq == i)
break;
/* Do we already have a mapping for this IOAPIC pin */
if ((irq->mpc_dstapic == intsrc.mpc_dstapic) &&
(irq->mpc_dstirq == i))
break;
}
if (idx != mp_irq_entries) {
printk(KERN_DEBUG "ACPI: IRQ%d used by override.\n", i);
continue; /* IRQ already used */
}
intsrc.mpc_irqtype = mp_INT;
intsrc.mpc_srcbusirq = i; /* Identity mapped */
intsrc.mpc_dstirq = i;
Dprintk("Int: type %d, pol %d, trig %d, bus %d, irq %d, "
"%d-%d\n", intsrc.mpc_irqtype, intsrc.mpc_irqflag & 3,
(intsrc.mpc_irqflag >> 2) & 3, intsrc.mpc_srcbus,
intsrc.mpc_srcbusirq, intsrc.mpc_dstapic,
intsrc.mpc_dstirq);
mp_irqs[mp_irq_entries] = intsrc;
if (++mp_irq_entries == MAX_IRQ_SOURCES)
panic("Max # of irq sources exceeded!\n");
}
}
#define MAX_GSI_NUM 4096
int mp_register_gsi (u32 gsi, int edge_level, int active_high_low)
{
int ioapic = -1;
int ioapic_pin = 0;
int idx, bit = 0;
static int pci_irq = 16;
/*
* Mapping between Global System Interrups, which
* represent all possible interrupts, and IRQs
* assigned to actual devices.
*/
static int gsi_to_irq[MAX_GSI_NUM];
#ifdef CONFIG_ACPI_BUS
/* Don't set up the ACPI SCI because it's already set up */
if (acpi_fadt.sci_int == gsi)
return gsi;
#endif
ioapic = mp_find_ioapic(gsi);
if (ioapic < 0) {
printk(KERN_WARNING "No IOAPIC for GSI %u\n", gsi);
return gsi;
}
ioapic_pin = gsi - mp_ioapic_routing[ioapic].gsi_base;
if (ioapic_renumber_irq)
gsi = ioapic_renumber_irq(ioapic, gsi);
/*
* Avoid pin reprogramming. PRTs typically include entries
* with redundant pin->gsi mappings (but unique PCI devices);
* we only program the IOAPIC on the first.
*/
bit = ioapic_pin % 32;
idx = (ioapic_pin < 32) ? 0 : (ioapic_pin / 32);
if (idx > 3) {
printk(KERN_ERR "Invalid reference to IOAPIC pin "
"%d-%d\n", mp_ioapic_routing[ioapic].apic_id,
ioapic_pin);
return gsi;
}
if ((1<<bit) & mp_ioapic_routing[ioapic].pin_programmed[idx]) {
Dprintk(KERN_DEBUG "Pin %d-%d already programmed\n",
mp_ioapic_routing[ioapic].apic_id, ioapic_pin);
return gsi_to_irq[gsi];
}
mp_ioapic_routing[ioapic].pin_programmed[idx] |= (1<<bit);
if (edge_level) {
/*
* For PCI devices assign IRQs in order, avoiding gaps
* due to unused I/O APIC pins.
*/
int irq = gsi;
if (gsi < MAX_GSI_NUM) {
gsi = pci_irq++;
gsi_to_irq[irq] = gsi;
} else {
printk(KERN_ERR "GSI %u is too high\n", gsi);
return gsi;
}
}
io_apic_set_pci_routing(ioapic, ioapic_pin, gsi,
edge_level == ACPI_EDGE_SENSITIVE ? 0 : 1,
active_high_low == ACPI_ACTIVE_HIGH ? 0 : 1);
return gsi;
}
#endif /*CONFIG_X86_IO_APIC && (CONFIG_ACPI_INTERPRETER || CONFIG_ACPI_BOOT)*/
#endif /*CONFIG_ACPI_BOOT*/
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