diff options
Diffstat (limited to 'hw/phb3.c')
| -rw-r--r-- | hw/phb3.c | 40 |
1 files changed, 40 insertions, 0 deletions
@@ -4610,6 +4610,44 @@ static bool phb3_calculate_windows(struct phb3 *p) return true; } +/* + * Trigger a creset to disable CAPI mode on kernel shutdown. + * + * This helper is called repeatedly by the host sync notifier mechanism, which + * relies on the kernel to regularly poll the OPAL_SYNC_HOST_REBOOT call as it + * shuts down. + * + * This is a somewhat hacky abuse of the host sync notifier mechanism, but the + * alternatives require a new API call which won't work for older kernels. + */ +static bool phb3_host_sync_reset(void *data) +{ + struct phb3 *p = (struct phb3 *)data; + struct pci_slot *slot = p->phb.slot; + struct proc_chip *chip = get_chip(p->chip_id); + int64_t rc; + + switch (slot->state) { + case PHB3_SLOT_NORMAL: + lock(&capi_lock); + rc = (chip->capp_phb3_attached_mask & (1 << p->index)) ? + OPAL_PHB_CAPI_MODE_CAPI : + OPAL_PHB_CAPI_MODE_PCIE; + unlock(&capi_lock); + + if (rc == OPAL_PHB_CAPI_MODE_PCIE) + return true; + + PHBINF(p, "PHB in CAPI mode, resetting\n"); + p->flags &= ~PHB3_CAPP_RECOVERY; + phb3_creset(slot); + return false; + default: + rc = slot->ops.poll(slot); + return rc <= OPAL_SUCCESS; + } +} + static void phb3_create(struct dt_node *np) { const struct dt_property *prop; @@ -4743,6 +4781,8 @@ static void phb3_create(struct dt_node *np) /* Load capp microcode into capp unit */ capp_load_ucode(p); + opal_add_host_sync_notifier(phb3_host_sync_reset, p); + /* Platform additional setup */ if (platform.pci_setup_phb) platform.pci_setup_phb(&p->phb, p->index); |
