diff options
Diffstat (limited to 'sys/x86/x86/mca.c')
| -rw-r--r-- | sys/x86/x86/mca.c | 47 |
1 files changed, 43 insertions, 4 deletions
diff --git a/sys/x86/x86/mca.c b/sys/x86/x86/mca.c index e43c88b3a27b..4b40f343ac90 100644 --- a/sys/x86/x86/mca.c +++ b/sys/x86/x86/mca.c @@ -124,6 +124,17 @@ SYSCTL_INT(_hw_mca, OID_AUTO, erratum383, CTLFLAG_RDTUN, &workaround_erratum383, 0, "Is the workaround for Erratum 383 on AMD Family 10h processors enabled?"); +#ifdef DIAGNOSTIC +static uint64_t fake_status; +SYSCTL_U64(_hw_mca, OID_AUTO, fake_status, CTLFLAG_RW, + &fake_status, 0, + "Insert artificial MCA with given status (testing purpose only)"); +static int fake_bank; +SYSCTL_INT(_hw_mca, OID_AUTO, fake_bank, CTLFLAG_RW, + &fake_bank, 0, + "Bank to use for artificial MCAs (testing purpose only)"); +#endif + static STAILQ_HEAD(, mca_internal) mca_freelist; static int mca_freecount; static STAILQ_HEAD(, mca_internal) mca_records; @@ -701,8 +712,24 @@ mca_check_status(enum scan_mode mode, uint64_t mcg_cap, int bank, bool mce, recover; status = rdmsr(mca_msr_ops.status(bank)); - if (!(status & MC_STATUS_VAL)) + if (!(status & MC_STATUS_VAL)) { +#ifdef DIAGNOSTIC + /* + * Check if we have a pending artificial event to generate. + * Note that this is potentially racy with the sysctl. The + * tradeoff is deemed acceptable given the test nature + * of the code. + */ + if (fake_status && bank == fake_bank) { + status = fake_status; + fake_status = 0; + } + if (!(status & MC_STATUS_VAL)) + return (0); +#else return (0); +#endif + } recover = *recoverablep; mce = mca_is_mce(mcg_cap, status, &recover); @@ -796,9 +823,9 @@ mca_record_entry(enum scan_mode mode, const struct mca_record *record) mtx_lock_spin(&mca_lock); rec = STAILQ_FIRST(&mca_freelist); if (rec == NULL) { + mtx_unlock_spin(&mca_lock); printf("MCA: Unable to allocate space for an event.\n"); mca_log(record); - mtx_unlock_spin(&mca_lock); return; } STAILQ_REMOVE_HEAD(&mca_freelist, link); @@ -1017,6 +1044,7 @@ static void mca_process_records(enum scan_mode mode) { struct mca_internal *mca; + STAILQ_HEAD(, mca_internal) tmplist; /* * If in an interrupt context, defer the post-scan activities to a @@ -1028,10 +1056,21 @@ mca_process_records(enum scan_mode mode) return; } + /* + * Copy the pending list to the stack so we can drop the spin lock + * while we are emitting logs. + */ + STAILQ_INIT(&tmplist); mtx_lock_spin(&mca_lock); - while ((mca = STAILQ_FIRST(&mca_pending)) != NULL) { - STAILQ_REMOVE_HEAD(&mca_pending, link); + STAILQ_SWAP(&mca_pending, &tmplist, mca_internal); + mtx_unlock_spin(&mca_lock); + + STAILQ_FOREACH(mca, &tmplist, link) mca_log(&mca->rec); + + mtx_lock_spin(&mca_lock); + while ((mca = STAILQ_FIRST(&tmplist)) != NULL) { + STAILQ_REMOVE_HEAD(&tmplist, link); mca_store_record(mca); } mtx_unlock_spin(&mca_lock); |