Author: mav
Date: Tue Jun 22 19:42:27 2010
New Revision: 209440
URL: http://svn.freebsd.org/changeset/base/209440
Log:
Add "legacy route" support to HPET driver. When enabled, this mode makes
HPET to steal IRQ0 from i8254 and IRQ8 from RTC timers. It can be suitable
for HPETs without FSB interrupts support, as it gives them two unshared
IRQs. It allows them to provide one per-CPU event timer on dual-CPU system,
that should be suitable for further tickless kernels.
To enable it, such lines may be added to /boot/loader.conf:
hint.atrtc.0.clock=0
hint.attimer.0.clock=0
hint.hpet.0.legacy_route=1
Modified:
head/sys/dev/acpica/acpi_hpet.c
head/sys/x86/isa/atrtc.c
head/sys/x86/isa/clock.c
Modified: head/sys/dev/acpica/acpi_hpet.c
==============================================================================
--- head/sys/dev/acpica/acpi_hpet.c Tue Jun 22 19:24:07 2010
(r209439)
+++ head/sys/dev/acpica/acpi_hpet.c Tue Jun 22 19:42:27 2010
(r209440)
@@ -1,5 +1,6 @@
/*-
* Copyright (c) 2005 Poul-Henning Kamp
+ * Copyright (c) 2010 Alexander Motin <m...@freebsd.org>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
@@ -72,11 +73,13 @@ struct hpet_softc {
int intr_rid;
int irq;
int useirq;
+ int legacy_route;
struct resource *mem_res;
struct resource *intr_res;
void *intr_handle;
ACPI_HANDLE handle;
uint64_t freq;
+ uint32_t caps;
struct timecounter tc;
struct hpet_timer {
struct eventtimer et;
@@ -118,7 +121,10 @@ hpet_enable(struct hpet_softc *sc)
uint32_t val;
val = bus_read_4(sc->mem_res, HPET_CONFIG);
- val &= ~HPET_CNF_LEG_RT;
+ if (sc->legacy_route)
+ val |= HPET_CNF_LEG_RT;
+ else
+ val &= ~HPET_CNF_LEG_RT;
val |= HPET_CNF_ENABLE;
bus_write_4(sc->mem_res, HPET_CONFIG, val);
}
@@ -352,10 +358,10 @@ hpet_attach(device_t dev)
}
sc->freq = (1000000000000000LL + val / 2) / val;
- val = bus_read_4(sc->mem_res, HPET_CAPABILITIES);
- vendor = (val & HPET_CAP_VENDOR_ID) >> 16;
- rev = val & HPET_CAP_REV_ID;
- num_timers = 1 + ((val & HPET_CAP_NUM_TIM) >> 8);
+ sc->caps = bus_read_4(sc->mem_res, HPET_CAPABILITIES);
+ vendor = (sc->caps & HPET_CAP_VENDOR_ID) >> 16;
+ rev = sc->caps & HPET_CAP_REV_ID;
+ num_timers = 1 + ((sc->caps & HPET_CAP_NUM_TIM) >> 8);
/*
* ATI/AMD violates IA-PC HPET (High Precision Event Timers)
* Specification and provides an off by one number
@@ -368,11 +374,11 @@ hpet_attach(device_t dev)
if (bootverbose) {
device_printf(dev,
"vendor 0x%x, rev 0x%x, %jdHz%s, %d timers,%s\n",
- vendor, rev,
- sc->freq, (val & HPET_CAP_COUNT_SIZE) ? " 64bit" : "",
- num_timers, (val & HPET_CAP_LEG_RT) ? " legacy route" : "");
+ vendor, rev, sc->freq,
+ (sc->caps & HPET_CAP_COUNT_SIZE) ? " 64bit" : "",
+ num_timers,
+ (sc->caps & HPET_CAP_LEG_RT) ? " legacy route" : "");
}
- num_msi = 0;
for (i = 0; i < num_timers; i++) {
t = &sc->t[i];
t->sc = sc;
@@ -391,10 +397,6 @@ hpet_attach(device_t dev)
(t->caps & HPET_TCAP_SIZE) ? ", 64bit" : "",
(t->caps & HPET_TCAP_PER_INT) ? ", periodic" : "");
}
-#ifdef DEV_APIC
- if (t->caps & HPET_TCAP_FSB_INT_DEL)
- num_msi++;
-#endif
}
if (testenv("debug.acpi.hpet_test"))
hpet_test(sc);
@@ -425,10 +427,20 @@ hpet_attach(device_t dev)
if (resource_int_value(device_get_name(dev), device_get_unit(dev),
"clock", &i) == 0 && i == 0)
return (0);
- num_percpu_et = min(num_msi / mp_ncpus, 2);
- num_percpu_t = num_percpu_et * mp_ncpus;
- cur_cpu = CPU_FIRST();
- pcpu_master = 0;
+
+ /* Check whether we can and want legacy routing. */
+ sc->legacy_route = 0;
+ resource_int_value(device_get_name(dev), device_get_unit(dev),
+ "legacy_route", &sc->legacy_route);
+ if ((sc->caps & HPET_CAP_LEG_RT) == 0)
+ sc->legacy_route = 0;
+ if (sc->legacy_route) {
+ sc->t[0].vectors = 0;
+ sc->t[1].vectors = 0;
+ }
+
+ num_msi = 0;
+ sc->useirq = 0;
/* Find common legacy IRQ vectors for all timers. */
cvectors = 0xffff0000;
/*
@@ -440,47 +452,67 @@ hpet_attach(device_t dev)
*/
if (vendor == HPET_VENDID_AMD)
cvectors = 0x00000000;
- sc->useirq = 0;
for (i = 0; i < num_timers; i++) {
t = &sc->t[i];
+ if (sc->legacy_route && i < 2)
+ t->irq = (i == 0) ? 0 : 8;
#ifdef DEV_APIC
- if (t->caps & HPET_TCAP_FSB_INT_DEL) {
+ else if (t->caps & HPET_TCAP_FSB_INT_DEL) {
if ((j = PCIB_ALLOC_MSIX(
device_get_parent(device_get_parent(dev)), dev,
&t->irq))) {
device_printf(dev,
- "Can't allocate interrupt: %d.\n", j);
- } else if (!(t->intr_res =
+ "Can't allocate interrupt for t%d.\n", j);
+ }
+ }
+#endif
+ if (t->irq >= 0) {
+ if (!(t->intr_res =
bus_alloc_resource(dev, SYS_RES_IRQ, &t->intr_rid,
- t->irq, t->irq, 1, RF_SHAREABLE | RF_ACTIVE))) {
- device_printf(dev, "Can't map interrupt.\n");
+ t->irq, t->irq, 1, RF_ACTIVE))) {
+ t->irq = -1;
+ device_printf(dev,
+ "Can't map interrupt for t%d.\n", i);
} else if ((bus_setup_intr(dev, t->intr_res,
INTR_MPSAFE | INTR_TYPE_CLK,
(driver_filter_t *)hpet_intr_single, NULL,
t, &t->intr_handle))) {
- device_printf(dev, "Can't setup interrupt.\n");
+ t->irq = -1;
+ device_printf(dev,
+ "Can't setup interrupt for t%d.\n", i);
} else {
bus_describe_intr(dev, t->intr_res,
t->intr_handle, "t%d", i);
num_msi++;
- if (num_percpu_t > 0) {
- if (cur_cpu == CPU_FIRST())
- pcpu_master = i;
- t->pcpu_master = pcpu_master;
- sc->t[pcpu_master].
- pcpu_slaves[cur_cpu] = i;
- bus_bind_intr(dev, t->intr_res,
cur_cpu);
- cur_cpu = CPU_NEXT(cur_cpu);
- num_percpu_t--;
- }
}
- } else
-#endif
- if ((cvectors & t->vectors) != 0) {
+ }
+ if (t->irq < 0 && (cvectors & t->vectors) != 0) {
cvectors &= t->vectors;
sc->useirq |= (1 << i);
}
}
+ if (sc->legacy_route && sc->t[0].irq < 0 && sc->t[1].irq < 0)
+ sc->legacy_route = 0;
+ if (sc->legacy_route)
+ hpet_enable(sc);
+ /* Group timers for per-CPU operation. */
+ num_percpu_et = min(num_msi / mp_ncpus, 2);
+ num_percpu_t = num_percpu_et * mp_ncpus;
+ pcpu_master = 0;
+ cur_cpu = CPU_FIRST();
+ for (i = 0; i < num_timers; i++) {
+ t = &sc->t[i];
+ if (t->irq >= 0 && num_percpu_t > 0) {
+ if (cur_cpu == CPU_FIRST())
+ pcpu_master = i;
+ t->pcpu_master = pcpu_master;
+ sc->t[pcpu_master].
+ pcpu_slaves[cur_cpu] = i;
+ bus_bind_intr(dev, t->intr_res, cur_cpu);
+ cur_cpu = CPU_NEXT(cur_cpu);
+ num_percpu_t--;
+ }
+ }
bus_write_4(sc->mem_res, HPET_ISR, 0xffffffff);
sc->irq = -1;
sc->intr_rid = -1;
@@ -508,7 +540,11 @@ hpet_attach(device_t dev)
t = &sc->t[i];
t->caps &= ~(HPET_TCNF_FSB_EN | HPET_TCNF_INT_ROUTE);
t->caps &= ~(HPET_TCNF_VAL_SET | HPET_TCNF_INT_ENB);
+ t->caps &= ~(HPET_TCNF_INT_TYPE);
t->caps |= HPET_TCNF_32MODE;
+ if (t->irq >= 0 && sc->legacy_route && i < 2) {
+ /* Legacy route doesn't need more configuration. */
+ } else
#ifdef DEV_APIC
if (t->irq >= 0) {
uint64_t addr;
@@ -599,7 +635,7 @@ hpet_resume(device_t dev)
for (i = 0; i < sc->num_timers; i++) {
t = &sc->t[i];
#ifdef DEV_APIC
- if (t->irq >= 0) {
+ if (t->irq >= 0 && (sc->legacy_route == 0 || i >= 2)) {
uint64_t addr;
uint32_t data;
Modified: head/sys/x86/isa/atrtc.c
==============================================================================
--- head/sys/x86/isa/atrtc.c Tue Jun 22 19:24:07 2010 (r209439)
+++ head/sys/x86/isa/atrtc.c Tue Jun 22 19:42:27 2010 (r209440)
@@ -244,34 +244,35 @@ static int
atrtc_attach(device_t dev)
{
struct atrtc_softc *sc;
- int i, diag, haveirq = 0;
+ int i, diag;
sc = device_get_softc(dev);
if (!(sc->port_res = bus_alloc_resource(dev, SYS_RES_IOPORT,
&sc->port_rid, IO_RTC, IO_RTC + 1, 2, RF_ACTIVE)))
device_printf(dev,"Warning: Couldn't map I/O.\n");
- if (!(sc->intr_res = bus_alloc_resource(dev, SYS_RES_IRQ,
- &sc->intr_rid, 8, 8, 1, RF_ACTIVE)))
- device_printf(dev,"Couldn't map Interrupt.\n");
- else if ((bus_setup_intr(dev, sc->intr_res,
- INTR_MPSAFE | INTR_TYPE_CLK, (driver_filter_t *)rtc_intr, NULL,
- sc, &sc->intr_handler))) {
- device_printf(dev, "Can't setup interrupt.\n");
- } else {
- haveirq = 1;
- /* Bind IRQ to BSP to avoid live migration. */
- bus_bind_intr(dev, sc->intr_res, 0);
- }
diag = rtcin(RTC_DIAG);
if (diag != 0)
printf("RTC BIOS diagnostic error %b\n", diag, RTCDG_BITS);
atrtc_start();
clock_register(dev, 1000000);
bzero(&sc->et, sizeof(struct eventtimer));
- if (haveirq &&
- !atrtcclock_disable &&
+ if (!atrtcclock_disable &&
(resource_int_value(device_get_name(dev), device_get_unit(dev),
"clock", &i) != 0 || i != 0)) {
+ if (!(sc->intr_res = bus_alloc_resource(dev, SYS_RES_IRQ,
+ &sc->intr_rid, 8, 8, 1, RF_ACTIVE))) {
+ device_printf(dev,"Can't map interrupt.\n");
+ return (0);
+ } else if ((bus_setup_intr(dev, sc->intr_res,
+ INTR_MPSAFE | INTR_TYPE_CLK,
+ (driver_filter_t *)rtc_intr, NULL,
+ sc, &sc->intr_handler))) {
+ device_printf(dev, "Can't setup interrupt.\n");
+ return (0);
+ } else {
+ /* Bind IRQ to BSP to avoid live migration. */
+ bus_bind_intr(dev, sc->intr_res, 0);
+ }
sc->et.et_name = "RTC";
sc->et.et_flags = ET_FLAGS_PERIODIC;
sc->et.et_quality = 0;
Modified: head/sys/x86/isa/clock.c
==============================================================================
--- head/sys/x86/isa/clock.c Tue Jun 22 19:24:07 2010 (r209439)
+++ head/sys/x86/isa/clock.c Tue Jun 22 19:42:27 2010 (r209440)
@@ -522,9 +522,6 @@ attimer_attach(device_t dev)
attimer_sc = sc = device_get_softc(dev);
bzero(sc, sizeof(struct attimer_softc));
- if (!(sc->intr_res = bus_alloc_resource(dev, SYS_RES_IRQ,
- &sc->intr_rid, 0, 0, 1, RF_ACTIVE)))
- device_printf(dev,"Warning: Couldn't map Interrupt.\n");
i8254_intsrc = intr_lookup_source(0);
if (i8254_intsrc != NULL)
i8254_pending = i8254_intsrc->is_pic->pic_source_pending;
@@ -538,6 +535,11 @@ attimer_attach(device_t dev)
tc_init(&sc->tc);
if (resource_int_value(device_get_name(dev), device_get_unit(dev),
"clock", &i) != 0 || i != 0) {
+ if (!(sc->intr_res = bus_alloc_resource(dev, SYS_RES_IRQ,
+ &sc->intr_rid, 0, 0, 1, RF_ACTIVE))) {
+ device_printf(dev,"Can't map interrupt.\n");
+ return (0);
+ }
/* Dirty hack, to make bus_setup_intr to not enable source. */
i8254_intsrc->is_handlers++;
if ((bus_setup_intr(dev, sc->intr_res,
@@ -545,18 +547,19 @@ attimer_attach(device_t dev)
(driver_filter_t *)clkintr, NULL,
sc, &sc->intr_handler))) {
device_printf(dev, "Can't setup interrupt.\n");
- } else {
- i8254_intsrc->is_pic->pic_enable_intr(i8254_intsrc);
- sc->et.et_name = "i8254";
- sc->et.et_flags = ET_FLAGS_PERIODIC;
- sc->et.et_quality = 100;
- sc->et.et_frequency = i8254_freq;
- sc->et.et_start = attimer_start;
- sc->et.et_stop = attimer_stop;
- sc->et.et_priv = dev;
- et_register(&sc->et);
+ i8254_intsrc->is_handlers--;
+ return (0);
}
i8254_intsrc->is_handlers--;
+ i8254_intsrc->is_pic->pic_enable_intr(i8254_intsrc);
+ sc->et.et_name = "i8254";
+ sc->et.et_flags = ET_FLAGS_PERIODIC;
+ sc->et.et_quality = 100;
+ sc->et.et_frequency = i8254_freq;
+ sc->et.et_start = attimer_start;
+ sc->et.et_stop = attimer_stop;
+ sc->et.et_priv = dev;
+ et_register(&sc->et);
}
return(0);
}
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