Author: marius
Date: Sat Jan 28 22:42:33 2012
New Revision: 230664
URL: http://svn.freebsd.org/changeset/base/230664
Log:
As it turns out r227960 may still be insufficient with PREEMPTION
so try harder to get the CDMA sync interrupt delivered and also in
a more efficient way:
- wrap the whole process of sending and receiving the CDMA sync
interrupt in a critical section so we don't get preempted,
- send the CDMA sync interrupt to the CPU that is actually waiting
for it to happen so we don't take a detour via another CPU,
- instead of waiting for up to 15 seconds for the interrupt to
trigger try the whole process for up to 15 times using a one
second timeout (the code was also changed to just ignore belated
interrupts of a previous tries should they appear).
According to testing done by Peter Jeremy with the debugging also
added as part of this commit the first two changes apparently are
sufficient to now properly get the CDMA sync interrupts delivered
at the first try though.
Modified:
head/sys/sparc64/pci/schizo.c
head/sys/sparc64/pci/schizovar.h
Modified: head/sys/sparc64/pci/schizo.c
==============================================================================
--- head/sys/sparc64/pci/schizo.c Sat Jan 28 22:24:59 2012
(r230663)
+++ head/sys/sparc64/pci/schizo.c Sat Jan 28 22:42:33 2012
(r230664)
@@ -178,6 +178,8 @@ struct schizo_icarg {
bus_addr_t sica_clr;
};
+#define SCHIZO_CDMA_TIMEOUT 1 /* 1 second per try */
+#define SCHIZO_CDMA_TRIES 15
#define SCHIZO_PERF_CNT_QLTY 100
#define SCHIZO_SPC_BARRIER(spc, sc, offs, len, flags)
\
@@ -706,13 +708,15 @@ schizo_attach(device_t dev)
i = INTINO(bus_get_resource_start(dev, SYS_RES_IRQ,
4));
if (i == STX_CDMA_A_INO || i == STX_CDMA_B_INO) {
- (void)schizo_get_intrmap(sc, i, NULL,
- &sc->sc_cdma_clr);
+ sc->sc_cdma_vec = INTMAP_VEC(sc->sc_ign, i);
+ (void)schizo_get_intrmap(sc, i,
+ &sc->sc_cdma_map, &sc->sc_cdma_clr);
schizo_set_intr(sc, 4, i, schizo_cdma);
} else {
i = STX_CDMA_A_INO + sc->sc_half;
+ sc->sc_cdma_vec = INTMAP_VEC(sc->sc_ign, i);
if (bus_set_resource(dev, SYS_RES_IRQ, 5,
- INTMAP_VEC(sc->sc_ign, i), 1) != 0)
+ sc->sc_cdma_vec, 1) != 0)
panic("%s: failed to add CDMA "
"interrupt", __func__);
j = schizo_intr_register(sc, i);
@@ -720,8 +724,8 @@ schizo_attach(device_t dev)
panic("%s: could not register "
"interrupt controller for CDMA "
"(%d)", __func__, j);
- (void)schizo_get_intrmap(sc, i, NULL,
- &sc->sc_cdma_clr);
+ (void)schizo_get_intrmap(sc, i,
+ &sc->sc_cdma_map, &sc->sc_cdma_clr);
schizo_set_intr(sc, 5, i, schizo_cdma);
}
} else {
@@ -988,7 +992,8 @@ schizo_cdma(void *arg)
{
struct schizo_softc *sc = arg;
- atomic_store_rel_32(&sc->sc_cdma_state, SCHIZO_CDMA_STATE_RECEIVED);
+ atomic_cmpset_32(&sc->sc_cdma_state, SCHIZO_CDMA_STATE_PENDING,
+ SCHIZO_CDMA_STATE_RECEIVED);
return (FILTER_HANDLED);
}
@@ -1153,7 +1158,10 @@ schizo_dmamap_sync(bus_dma_tag_t dt, bus
struct timeval cur, end;
struct schizo_iommu_state *sis = dt->dt_cookie;
struct schizo_softc *sc = sis->sis_sc;
- int res;
+ int i, res;
+#ifdef INVARIANTS
+ register_t pil;
+#endif
if ((map->dm_flags & DMF_STREAMED) != 0) {
iommu_dma_methods.dm_dmamap_sync(dt, map, op);
@@ -1170,20 +1178,36 @@ schizo_dmamap_sync(bus_dma_tag_t dt, bus
* but given that these disable interrupts we have to emulate
* one.
*/
+ critical_enter();
+ KASSERT((rdpr(pstate) & PSTATE_IE) != 0,
+ ("%s: interrupts disabled", __func__));
+ KASSERT((pil = rdpr(pil)) <= PIL_BRIDGE,
+ ("%s: PIL too low (%ld)", __func__, pil));
for (; atomic_cmpset_acq_32(&sc->sc_cdma_state,
SCHIZO_CDMA_STATE_IDLE, SCHIZO_CDMA_STATE_PENDING) == 0;)
;
- SCHIZO_PCI_WRITE_8(sc, sc->sc_cdma_clr, INTCLR_RECEIVED);
- microuptime(&cur);
- end.tv_sec = 15;
- end.tv_usec = 0;
- timevaladd(&end, &cur);
- for (; (res = atomic_cmpset_rel_32(&sc->sc_cdma_state,
- SCHIZO_CDMA_STATE_RECEIVED, SCHIZO_CDMA_STATE_IDLE)) ==
- 0 && timevalcmp(&cur, &end, <=);)
+ SCHIZO_PCI_WRITE_8(sc, sc->sc_cdma_map,
+ INTMAP_ENABLE(sc->sc_cdma_vec, PCPU_GET(mid)));
+ for (i = 0; i < SCHIZO_CDMA_TRIES; i++) {
+ if (i > 0)
+ printf("%s: try %d\n", __func__, i);
+ SCHIZO_PCI_WRITE_8(sc, sc->sc_cdma_clr,
+ INTCLR_RECEIVED);
microuptime(&cur);
+ end.tv_sec = SCHIZO_CDMA_TIMEOUT;
+ end.tv_usec = 0;
+ timevaladd(&end, &cur);
+ for (; (res = atomic_cmpset_rel_32(&sc->sc_cdma_state,
+ SCHIZO_CDMA_STATE_RECEIVED,
+ SCHIZO_CDMA_STATE_IDLE)) == 0 &&
+ timevalcmp(&cur, &end, <=);)
+ microuptime(&cur);
+ if (res != 0)
+ break;
+ }
if (res == 0)
panic("%s: DMA does not sync", __func__);
+ critical_exit();
}
if ((op & BUS_DMASYNC_PREWRITE) != 0)
@@ -1352,7 +1376,7 @@ schizo_alloc_resource(device_t bus, devi
panic("%s: XXX: interrupt range", __func__);
start = end = INTMAP_VEC(sc->sc_ign, end);
return (bus_generic_alloc_resource(bus, child, type, rid,
- start, end, count, flags));
+ start, end, count, flags));
case SYS_RES_MEMORY:
rm = &sc->sc_pci_mem_rman;
break;
Modified: head/sys/sparc64/pci/schizovar.h
==============================================================================
--- head/sys/sparc64/pci/schizovar.h Sat Jan 28 22:24:59 2012
(r230663)
+++ head/sys/sparc64/pci/schizovar.h Sat Jan 28 22:42:33 2012
(r230664)
@@ -59,7 +59,9 @@ struct schizo_softc {
#define SCHIZO_FLAGS_BSWAR (1 << 0)
#define SCHIZO_FLAGS_XMODE (1 << 1)
+ bus_addr_t sc_cdma_map;
bus_addr_t sc_cdma_clr;
+ uint32_t sc_cdma_vec;
uint32_t sc_cdma_state;
#define SCHIZO_CDMA_STATE_IDLE (1 << 0)
#define SCHIZO_CDMA_STATE_PENDING (1 << 1)
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