ref: e81c54ba2ecc673a4d5f8aed0e9b52841fe07b0d
dir: /os/pc/mp.c/
#include "u.h"
#include "../port/lib.h"
#include "mem.h"
#include "dat.h"
#include "fns.h"
#include "io.h"
#include "../port/pci.h"
#include "ureg.h"
#include "mp.h"
#include "apbootstrap.i"
#define DP if(1){}else print
extern void i8259init(void);
/* filled in by pcmpinit or acpiinit */
Bus* mpbus;
Bus* mpbuslast;
int mpisabus = -1;
int mpeisabus = -1;
Apic *mpioapic[MaxAPICNO+1];
Apic *mpapic[MaxAPICNO+1];
int
mpintrinit(Bus* bus, PCMPintr* intr, int vno, int /*irq*/)
{
int el, po, v;
/*
* Parse an I/O or Local APIC interrupt table entry and
* return the encoded vector.
*/
v = vno;
po = intr->flags & PcmpPOMASK;
el = intr->flags & PcmpELMASK;
switch(intr->intr){
default: /* PcmpINT */
v |= ApicFIXED; /* no-op */
break;
case PcmpNMI:
v |= ApicNMI;
po = PcmpHIGH;
el = PcmpEDGE;
break;
case PcmpSMI:
v |= ApicSMI;
break;
case PcmpExtINT:
v |= ApicExtINT;
/*
* The AMI Goliath doesn't boot successfully with it's LINTR0
* entry which decodes to low+level. The PPro manual says ExtINT
* should be level, whereas the Pentium is edge. Setting the
* Goliath to edge+high seems to cure the problem. Other PPro
* MP tables (e.g. ASUS P/I-P65UP5 have a entry which decodes
* to edge+high, so who knows.
* Perhaps it would be best just to not set an ExtINT entry at
* all, it shouldn't be needed for SMP mode.
*/
po = PcmpHIGH;
el = PcmpEDGE;
break;
}
/*
*/
if(bus->type == BusEISA && !po && !el /*&& !(i8259elcr & (1<<irq))*/){
po = PcmpHIGH;
el = PcmpEDGE;
}
if(!po)
po = bus->po;
if(po == PcmpLOW)
v |= ApicLOW;
else if(po != PcmpHIGH){
print("mpintrinit: bad polarity 0x%uX\n", po);
return ApicIMASK;
}
if(!el)
el = bus->el;
if(el == PcmpLEVEL)
v |= ApicLEVEL;
else if(el != PcmpEDGE){
print("mpintrinit: bad trigger 0x%uX\n", el);
return ApicIMASK;
}
return v;
}
uvlong
tscticks(uvlong *hz)
{
if(hz != nil)
*hz = m->cpuhz;
cycles(&m->tscticks); /* Uses the rdtsc instruction */
return m->tscticks;
}
void
syncclock(void)
{
uvlong x;
if(arch->fastclock != tscticks)
return;
if(m->machno == 0){
wrmsr(0x10, 0);
m->tscticks = 0;
} else {
x = MACHP(0)->tscticks;
while(x == MACHP(0)->tscticks)
;
wrmsr(0x10, MACHP(0)->tscticks);
cycles(&m->tscticks);
}
}
static void
showglobalconfig(void)
{
u64 flags;
u32 iopl;
uintptr apic_base;
print("APIC global configuration\n");
flags = rflags();
print(" RFLAGS: 0x%zux, ", flags);
if(flags & 0x200)
print("maskable interrupts enabled, ");
else
print("maskable interrupts disabled, ");
iopl = flags & (0x11 << 12);
print("iopl 0x%x", iopl);
print("\n");
rdmsr(0x1B, (s64*)&apic_base);
print(" APIC_BASE: 0x%zux, ", apic_base);
if(apic_base & 0x100)
print("BSP, ");
else
print("not BSP, ");
if(apic_base & 0x400)
print("enable x2APIC mode, ");
else
print("disable x2APIC mode, ");
if(apic_base & 0x800)
print("APIC global enable");
else
print("APIC global disable");
print("\n");
}
void
mpinit(void)
{
int ncpu, i;
Apic *apic;
char *cp;
/* showglobalconfig(); */
i8259init();
syncclock();
DP("mpinit after syncclock getconf(*apicdebug) %s\n", getconf("*apicdebug"));
if(getconf("*apicdebug")){
Bus *b;
Aintr *ai;
PCMPintr *pi;
for(i=0; i<=MaxAPICNO; i++){
if(apic = mpapic[i])
print("LAPIC%d: pa=%lux va=%#p flags=%x\n",
i, apic->paddr, apic->addr, apic->flags);
if(apic = mpioapic[i])
print("IOAPIC%d: pa=%lux va=%#p flags=%x gsibase=%d mre=%d\n",
i, apic->paddr, apic->addr, apic->flags, apic->gsibase, apic->mre);
}
for(b = mpbus; b; b = b->next){
print("BUS%d type=%d flags=%x\n", b->busno, b->type, b->po|b->el);
for(ai = b->aintr; ai; ai = ai->next){
if(pi = ai->intr)
print("\ttype=%d irq=%d (%d [%c]) apic=%d intin=%d flags=%x\n",
pi->type, pi->irq, pi->irq>>2, "ABCD"[pi->irq&3],
pi->apicno, pi->intin, pi->flags);
}
}
}
apic = nil;
for(i=0; i<=MaxAPICNO; i++){
if(mpapic[i] == nil)
continue;
if(mpapic[i]->flags & PcmpBP){
apic = mpapic[i];
break;
}
}
if(apic == nil){
panic("mpinit: no bootstrap processor");
return;
}
apic->online = 1;
lapicinit(apic);
/* lapicerror(nil,nil); */
/*
* These interrupts are local to the processor
* and do not appear in the I/O APIC so it is OK
* to set them now.
*/
intrenable(IrqTIMER, lapicclock, 0, BUSUNKNOWN, "clock");
intrenable(IrqERROR, lapicerror, 0, BUSUNKNOWN, "lapicerror");
intrenable(IrqSPURIOUS, lapicspurious, 0, BUSUNKNOWN, "lapicspurious");
lapiconline();
/* lapicerror(nil,nil); */
/*
* Initialise the application processors.
*/
if(cp = getconf("*ncpu")){
ncpu = strtol(cp, 0, 0);
if(ncpu < 1)
ncpu = 1;
else if(ncpu > MAXMACH)
ncpu = MAXMACH;
}
else
ncpu = MAXMACH;
if(sizeof(apbootstrap) > 4*KiB)
print("mpinit: sizeof(apbootstrap) 0x%x > 4*KiB -- fix it\n", sizeof(apbootstrap));
memmove((void*)APBOOTSTRAP, apbootstrap, sizeof(apbootstrap));
/*
for(i=0;i<sizeof(apbootstrap);i++){
DP(" %x", *((uchar*)APBOOTSTRAP+i));
}
DP("\n");
*/
for(i=0; i<nelem(mpapic); i++){
if((apic = mpapic[i]) == nil)
continue;
if(apic->machno >= MAXMACH)
continue;
if(ncpu <= 1)
break;
if((apic->flags & (PcmpBP|PcmpEN)) == PcmpEN){
mpstartap(apic);
conf.nmach++;
ncpu--;
}
}
/*
* we don't really know the number of processors till
* here.
*
* set conf.copymode here if nmach > 1.
* Should look for an ExtINT line and enable it.
*/
if(m->cpuidfamily == 3 || conf.nmach > 1)
conf.copymode = 1;
}
static int
mpintrcpu(void)
{
static Lock physidlock;
static int physid;
int i;
/*
* The bulk of this code was written ~1995, when there was
* one architecture and one generation of hardware, the number
* of CPUs was up to 4(8) and the choices for interrupt routing
* were physical, or flat logical (optionally with lowest
* priority interrupt). Logical mode hasn't scaled well with
* the increasing number of packages/cores/threads, so the
* fall-back is to physical mode, which works across all processor
* generations, both AMD and Intel, using the APIC and xAPIC.
*
* Interrupt routing policy can be set here.
* Currently, just assign each interrupt to a different CPU on
* a round-robin basis. Some idea of the packages/cores/thread
* topology would be useful here, e.g. to not assign interrupts
* to more than one thread in a core, or to use a "noise" core.
* But, as usual, Intel make that an onerous task.
*/
lock(&physidlock);
for(;;){
i = physid++;
if(physid >= nelem(mpapic))
physid = 0;
if(mpapic[i] == nil)
continue;
if(mpapic[i]->online)
break;
}
unlock(&physidlock);
return mpapic[i]->apicno;
}
/*
* With the APIC a unique vector can be assigned to each
* request to enable an interrupt. There are two reasons this
* is a good idea:
* 1) to prevent lost interrupts, no more than 2 interrupts
* should be assigned per block of 16 vectors (there is an
* in-service entry and a holding entry for each priority
* level and there is one priority level per block of 16
* interrupts).
* 2) each input pin on the IOAPIC will receive a different
* vector regardless of whether the devices on that pin use
* the same IRQ as devices on another pin.
*/
static int
allocvector(void)
{
static int round = 0, num = 0;
static Lock l;
int vno;
lock(&l);
vno = VectorAPIC + num;
if(vno < MaxVectorAPIC-7)
num += 8;
else
num = ++round % 8;
unlock(&l);
return vno;
}
static int
ioapicirqenable(Vctl *v, int shared)
{
Aintr *aintr = v->aux;
int lo, hi;
if(shared)
return 0;
hi = v->cpu<<24;
lo = mpintrinit(aintr->bus, aintr->intr, v->vno, v->irq);
lo |= ApicPHYSICAL; /* no-op */
ioapicrdtw(aintr->apic, aintr->intr->intin, hi, lo);
return 0;
}
static int
ioapicirqdisable(Vctl *v, int shared)
{
Aintr *aintr = v->aux;
int lo, hi;
if(shared)
return 0;
hi = 0;
lo = ApicIMASK;
ioapicrdtw(aintr->apic, aintr->intr->intin, hi, lo);
return 0;
}
static int
mpintrassignx(Vctl* v, int tbdf)
{
Bus *bus;
Pcidev *pci;
Aintr *aintr;
int bno, dno, pin, irq, type, lo, hi, n;
type = BUSTYPE(tbdf);
bno = BUSBNO(tbdf);
dno = BUSDNO(tbdf);
pin = 0;
pci = nil;
if(type == BusPCI){
if((pci = pcimatchtbdf(tbdf)) != nil)
pin = pcicfgr8(pci, PciINTP);
} else if(type == BusISA)
bno = mpisabus;
Findbus:
for(bus = mpbus; bus != nil; bus = bus->next){
if(bus->type != type)
continue;
if(bus->busno == bno)
break;
}
if(bus == nil){
/*
* if the PCI device is behind a bridge thats not described
* by the MP or ACPI tables then walk up the bus translating
* interrupt pin to parent bus.
*/
if(pci != nil && pci->parent != nil && pin > 0){
pci = pci->parent;
if(pci->ccrb == 6 && pci->ccru == 7){
/* Cardbus bridge, use controllers interrupt pin */
pin = pcicfgr8(pci, PciINTP);
} else {
/* PCI-PCI bridge */
pin = ((dno+(pin-1))%4)+1;
}
bno = BUSBNO(pci->tbdf);
dno = BUSDNO(pci->tbdf);
goto Findbus;
}
print("mpintrassign: can't find bus type %d, number %d\n", type, bno);
return -1;
}
/*
* For PCI devices the interrupt pin (INT[ABCD]) and device
* number are encoded into the entry irq field, so create something
* to match on.
*/
if(bus->type == BusPCI){
if(pin > 0)
irq = (dno<<2)|(pin-1);
else
irq = -1;
} else
irq = v->irq;
/*
* Find a matching interrupt entry from the list of interrupts
* attached to this bus.
*/
for(aintr = bus->aintr; aintr != nil; aintr = aintr->next){
if(aintr->intr->irq != irq)
continue;
/*
* Check if already enabled. Multifunction devices may share
* INT[A-D]# so, if already enabled, check the polarity matches
* and the trigger is level.
*/
ioapicrdtr(aintr->apic, aintr->intr->intin, &hi, &lo);
if(lo & ApicIMASK){
v->vno = allocvector();
v->cpu = mpintrcpu();
lo = mpintrinit(aintr->bus, aintr->intr, v->vno, v->irq);
lo |= ApicPHYSICAL; /* no-op */
if(lo & ApicIMASK){
print("mpintrassign: disabled irq %d, tbdf %uX, lo %8.8uX, hi %8.8uX\n",
v->irq, v->tbdf, lo, hi);
break;
}
} else {
v->vno = lo & 0xFF;
v->cpu = hi >> 24;
lo &= ~(ApicRemoteIRR|ApicDELIVS);
n = mpintrinit(aintr->bus, aintr->intr, v->vno, v->irq);
n |= ApicPHYSICAL; /* no-op */
if(lo != n){
print("mpintrassign: multiple botch irq %d, tbdf %uX, lo %8.8uX, n %8.8uX\n",
v->irq, v->tbdf, lo, n);
break;
}
}
v->isr = lapicisr;
v->eoi = lapiceoi;
if((aintr->apic->flags & PcmpEN) && aintr->apic->type == PcmpIOAPIC){
v->aux = aintr;
v->enable = ioapicirqenable;
v->disable = ioapicirqdisable;
}
return v->vno;
}
return -1;
}
enum {
HTMSIMapping = 0xA8,
HTMSIFlags = 0x02,
HTMSIFlagsEn = 0x01,
};
static int
htmsicapenable(Pcidev *p)
{
int cap, flags;
if((cap = pcihtcap(p, HTMSIMapping)) <= 0)
return -1;
flags = pcicfgr8(p, cap + HTMSIFlags);
if((flags & HTMSIFlagsEn) == 0)
pcicfgw8(p, cap + HTMSIFlags, flags | HTMSIFlagsEn);
return 0;
}
static int
htmsienable(Pcidev *pdev)
{
Pcidev *p;
p = nil;
while((p = pcimatch(p, 0x1022, 0)) != nil)
if(p->did == 0x1103 || p->did == 0x1203)
break;
if(p == nil)
return 0; /* not hypertransport platform */
p = nil;
while((p = pcimatch(p, 0x10de, 0)) != nil){
switch(p->did){
case 0x02f0: /* NVIDIA NFORCE C51 MEMC0 */
case 0x02f1: /* NVIDIA NFORCE C51 MEMC1 */
case 0x02f2: /* NVIDIA NFORCE C51 MEMC2 */
case 0x02f3: /* NVIDIA NFORCE C51 MEMC3 */
case 0x02f4: /* NVIDIA NFORCE C51 MEMC4 */
case 0x02f5: /* NVIDIA NFORCE C51 MEMC5 */
case 0x02f6: /* NVIDIA NFORCE C51 MEMC6 */
case 0x02f7: /* NVIDIA NFORCE C51 MEMC7 */
case 0x0369: /* NVIDIA NFORCE MCP55 MEMC */
htmsicapenable(p);
break;
}
}
if(htmsicapenable(pdev) == 0)
return 0;
for(p = pdev->parent; p != nil; p = p->parent)
if(htmsicapenable(p) == 0)
return 0;
return -1;
}
static int
msiirqenable(Vctl *v, int)
{
Pcidev *pci = v->aux;
return pcimsienable(pci, 0xFEE00000ULL | (v->cpu << 12), v->vno | (1<<14));
}
static int
msiirqdisable(Vctl *v, int)
{
Pcidev *pci = v->aux;
return pcimsidisable(pci);
}
static int
msiintrenable(Vctl *v)
{
Pcidev *pci;
int tbdf;
if(getconf("*nomsi") != nil)
return -1;
tbdf = v->tbdf;
if(tbdf == BUSUNKNOWN || BUSTYPE(tbdf) != BusPCI)
return -1;
pci = pcimatchtbdf(tbdf);
if(pci == nil) {
print("msiintrenable: could not find Pcidev for tbdf %uX\n", tbdf);
return -1;
}
if(htmsienable(pci) < 0)
return -1;
if(pcimsidisable(pci) < 0)
return -1;
v->vno = allocvector();
v->cpu = mpintrcpu();
v->isr = lapicisr;
v->eoi = lapiceoi;
v->aux = pci;
v->enable = msiirqenable;
v->disable = msiirqdisable;
return v->vno;
}
int
mpintrassign(Vctl* v)
{
int irq, tbdf, vno;
vno = msiintrenable(v);
if(vno != -1)
return vno;
/*
* If the bus is known, try it.
* BUSUNKNOWN is given both by [E]ISA devices and by
* interrupts local to the processor (local APIC, coprocessor
* breakpoint and page-fault).
*/
tbdf = v->tbdf;
if(tbdf != BUSUNKNOWN && (vno = mpintrassignx(v, tbdf)) != -1)
return vno;
irq = v->irq;
if(irq >= IrqLINT0 && irq <= MaxIrqLAPIC){
v->local = 1;
if(irq != IrqSPURIOUS)
v->isr = lapiceoi;
return VectorPIC+irq;
}
if(irq < 0 || irq > MaxIrqPIC){
print("mpintrassign: irq %d out of range\n", irq);
return -1;
}
/*
* Either didn't find it or have to try the default buses
* (ISA and EISA). This hack is due to either over-zealousness
* or laziness on the part of some manufacturers.
*
* The MP configuration table on some older systems
* (e.g. ASUS PCI/E-P54NP4) has an entry for the EISA bus
* but none for ISA. It also has the interrupt type and
* polarity set to 'default for this bus' which wouldn't
* be compatible with ISA.
*/
if(mpeisabus != -1){
vno = mpintrassignx(v, MKBUS(BusEISA, 0, 0, 0));
if(vno != -1)
return vno;
}
if(mpisabus != -1){
vno = mpintrassignx(v, MKBUS(BusISA, 0, 0, 0));
if(vno != -1)
return vno;
}
print("mpintrassign: out of choices eisa %d isa %d tbdf %uX irq %d\n",
mpeisabus, mpisabus, v->tbdf, v->irq);
return -1;
}
void
mpshutdown(void)
{
/*
* Park application processors.
*/
if(m->machno != 0){
splhi();
arch->introff();
for(;;) idle();
}
delay(1000);
splhi();
/*
* INIT all excluding self.
*/
lapicicrw(0, 0x000C0000|ApicINIT);
pcireset();
}