freebsd-dev/sys/powerpc/pseries/xics.c
Pedro F. Giffuni 33495e5daf Use our nitems() macro when param.h is available.
Replacements specific to arm, mips, pc98, powerpc and sparc64.

Discussed in:	freebsd-current
2016-04-20 15:45:55 +00:00

333 lines
7.8 KiB
C

/*-
* Copyright 2011 Nathan Whitehorn
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/systm.h>
#include <sys/module.h>
#include <sys/bus.h>
#include <sys/conf.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/smp.h>
#include <vm/vm.h>
#include <vm/pmap.h>
#include <machine/bus.h>
#include <machine/intr_machdep.h>
#include <machine/md_var.h>
#include <machine/rtas.h>
#include <dev/ofw/ofw_bus.h>
#include <dev/ofw/ofw_bus_subr.h>
#include "phyp-hvcall.h"
#include "pic_if.h"
#define XICP_PRIORITY 5 /* Random non-zero number */
#define XICP_IPI 2
#define MAX_XICP_IRQS (1<<24) /* 24-bit XIRR field */
static int xicp_probe(device_t);
static int xicp_attach(device_t);
static int xics_probe(device_t);
static int xics_attach(device_t);
static void xicp_bind(device_t dev, u_int irq, cpuset_t cpumask);
static void xicp_dispatch(device_t, struct trapframe *);
static void xicp_enable(device_t, u_int, u_int);
static void xicp_eoi(device_t, u_int);
static void xicp_ipi(device_t, u_int);
static void xicp_mask(device_t, u_int);
static void xicp_unmask(device_t, u_int);
static device_method_t xicp_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, xicp_probe),
DEVMETHOD(device_attach, xicp_attach),
/* PIC interface */
DEVMETHOD(pic_bind, xicp_bind),
DEVMETHOD(pic_dispatch, xicp_dispatch),
DEVMETHOD(pic_enable, xicp_enable),
DEVMETHOD(pic_eoi, xicp_eoi),
DEVMETHOD(pic_ipi, xicp_ipi),
DEVMETHOD(pic_mask, xicp_mask),
DEVMETHOD(pic_unmask, xicp_unmask),
{ 0, 0 },
};
static device_method_t xics_methods[] = {
/* Device interface */
DEVMETHOD(device_probe, xics_probe),
DEVMETHOD(device_attach, xics_attach),
{ 0, 0 },
};
struct xicp_softc {
struct mtx sc_mtx;
int ibm_int_on;
int ibm_int_off;
int ibm_get_xive;
int ibm_set_xive;
/* XXX: inefficient -- hash table? tree? */
struct {
int irq;
int vector;
} intvecs[256];
int nintvecs;
};
static driver_t xicp_driver = {
"xicp",
xicp_methods,
sizeof(struct xicp_softc)
};
static driver_t xics_driver = {
"xics",
xics_methods,
0
};
static devclass_t xicp_devclass;
static devclass_t xics_devclass;
EARLY_DRIVER_MODULE(xicp, ofwbus, xicp_driver, xicp_devclass, 0, 0,
BUS_PASS_INTERRUPT-1);
EARLY_DRIVER_MODULE(xics, ofwbus, xics_driver, xics_devclass, 0, 0,
BUS_PASS_INTERRUPT);
static int
xicp_probe(device_t dev)
{
if (ofw_bus_get_name(dev) == NULL || strcmp(ofw_bus_get_name(dev),
"interrupt-controller") != 0)
return (ENXIO);
if (!ofw_bus_is_compatible(dev, "ibm,ppc-xicp"))
return (ENXIO);
device_set_desc(dev, "PAPR virtual interrupt controller");
return (BUS_PROBE_GENERIC);
}
static int
xics_probe(device_t dev)
{
if (ofw_bus_get_name(dev) == NULL || strcmp(ofw_bus_get_name(dev),
"interrupt-controller") != 0)
return (ENXIO);
if (!ofw_bus_is_compatible(dev, "ibm,ppc-xics"))
return (ENXIO);
device_set_desc(dev, "PAPR virtual interrupt source");
return (BUS_PROBE_GENERIC);
}
static int
xicp_attach(device_t dev)
{
struct xicp_softc *sc = device_get_softc(dev);
phandle_t phandle = ofw_bus_get_node(dev);
mtx_init(&sc->sc_mtx, "XICP", NULL, MTX_DEF);
sc->nintvecs = 0;
sc->ibm_int_on = rtas_token_lookup("ibm,int-on");
sc->ibm_int_off = rtas_token_lookup("ibm,int-off");
sc->ibm_set_xive = rtas_token_lookup("ibm,set-xive");
sc->ibm_get_xive = rtas_token_lookup("ibm,get-xive");
powerpc_register_pic(dev, OF_xref_from_node(phandle), MAX_XICP_IRQS,
1 /* Number of IPIs */, FALSE);
root_pic = dev;
return (0);
}
static int
xics_attach(device_t dev)
{
phandle_t phandle = ofw_bus_get_node(dev);
/* The XICP (root PIC) will handle all our interrupts */
powerpc_register_pic(root_pic, OF_xref_from_node(phandle),
MAX_XICP_IRQS, 1 /* Number of IPIs */, FALSE);
return (0);
}
/*
* PIC I/F methods.
*/
static void
xicp_bind(device_t dev, u_int irq, cpuset_t cpumask)
{
struct xicp_softc *sc = device_get_softc(dev);
cell_t status, cpu;
int ncpus, i, error;
/*
* This doesn't appear to actually support affinity groups, so pick a
* random CPU.
*/
ncpus = 0;
CPU_FOREACH(cpu)
if (CPU_ISSET(cpu, &cpumask)) ncpus++;
i = mftb() % ncpus;
ncpus = 0;
CPU_FOREACH(cpu) {
if (!CPU_ISSET(cpu, &cpumask))
continue;
if (ncpus == i)
break;
ncpus++;
}
error = rtas_call_method(sc->ibm_set_xive, 3, 1, irq, cpu,
XICP_PRIORITY, &status);
if (error < 0)
panic("Cannot bind interrupt %d to CPU %d", irq, cpu);
}
static void
xicp_dispatch(device_t dev, struct trapframe *tf)
{
struct xicp_softc *sc;
uint64_t xirr, junk;
int i;
sc = device_get_softc(dev);
for (;;) {
/* Return value in R4, use the PFT call */
phyp_pft_hcall(H_XIRR, 0, 0, 0, 0, &xirr, &junk, &junk);
xirr &= 0x00ffffff;
if (xirr == 0) { /* No more pending interrupts? */
phyp_hcall(H_CPPR, (uint64_t)0xff);
break;
}
if (xirr == XICP_IPI) { /* Magic number for IPIs */
xirr = MAX_XICP_IRQS; /* Map to FreeBSD magic */
phyp_hcall(H_IPI, (uint64_t)(PCPU_GET(cpuid)),
0xff); /* Clear IPI */
}
/* XXX: super inefficient */
for (i = 0; i < sc->nintvecs; i++) {
if (sc->intvecs[i].irq == xirr)
break;
}
KASSERT(i < sc->nintvecs, ("Unmapped XIRR"));
powerpc_dispatch_intr(sc->intvecs[i].vector, tf);
}
}
static void
xicp_enable(device_t dev, u_int irq, u_int vector)
{
struct xicp_softc *sc;
cell_t status, cpu;
sc = device_get_softc(dev);
KASSERT(sc->nintvecs + 1 < nitems(sc->intvecs),
("Too many XICP interrupts"));
mtx_lock(&sc->sc_mtx);
sc->intvecs[sc->nintvecs].irq = irq;
sc->intvecs[sc->nintvecs].vector = vector;
mb();
sc->nintvecs++;
mtx_unlock(&sc->sc_mtx);
/* IPIs are also enabled */
if (irq == MAX_XICP_IRQS)
return;
/* Bind to this CPU to start: distrib. ID is last entry in gserver# */
cpu = PCPU_GET(cpuid);
rtas_call_method(sc->ibm_set_xive, 3, 1, irq, cpu, XICP_PRIORITY,
&status);
xicp_unmask(dev, irq);
}
static void
xicp_eoi(device_t dev, u_int irq)
{
uint64_t xirr;
if (irq == MAX_XICP_IRQS) /* Remap IPI interrupt to internal value */
irq = XICP_IPI;
xirr = irq | (XICP_PRIORITY << 24);
phyp_hcall(H_EOI, xirr);
}
static void
xicp_ipi(device_t dev, u_int cpu)
{
phyp_hcall(H_IPI, (uint64_t)cpu, XICP_PRIORITY);
}
static void
xicp_mask(device_t dev, u_int irq)
{
struct xicp_softc *sc = device_get_softc(dev);
cell_t status;
if (irq == MAX_XICP_IRQS)
return;
rtas_call_method(sc->ibm_int_off, 1, 1, irq, &status);
}
static void
xicp_unmask(device_t dev, u_int irq)
{
struct xicp_softc *sc = device_get_softc(dev);
cell_t status;
if (irq == MAX_XICP_IRQS)
return;
rtas_call_method(sc->ibm_int_on, 1, 1, irq, &status);
}