diff options
Diffstat (limited to 'arch/powerpc/kernel/eeh_driver.c')
| -rw-r--r-- | arch/powerpc/kernel/eeh_driver.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/eeh_driver.c b/arch/powerpc/kernel/eeh_driver.c index 6d91b51a5ddb..1f1e2cc045a9 100644 --- a/arch/powerpc/kernel/eeh_driver.c +++ b/arch/powerpc/kernel/eeh_driver.c @@ -417,6 +417,36 @@ static void *eeh_pe_detach_dev(void *data, void *userdata) return NULL; } +/* + * Explicitly clear PE's frozen state for PowerNV where + * we have frozen PE until BAR restore is completed. It's + * harmless to clear it for pSeries. To be consistent with + * PE reset (for 3 times), we try to clear the frozen state + * for 3 times as well. + */ +static int eeh_clear_pe_frozen_state(struct eeh_pe *pe) +{ + int i, rc; + + for (i = 0; i < 3; i++) { + rc = eeh_pci_enable(pe, EEH_OPT_THAW_MMIO); + if (rc) + continue; + rc = eeh_pci_enable(pe, EEH_OPT_THAW_DMA); + if (!rc) + break; + } + + /* The PE has been isolated, clear it */ + if (rc) + pr_warn("%s: Can't clear frozen PHB#%x-PE#%x (%d)\n", + __func__, pe->phb->global_number, pe->addr, rc); + else + eeh_pe_state_clear(pe, EEH_PE_ISOLATED); + + return rc; +} + /** * eeh_reset_device - Perform actual reset of a pci slot * @pe: EEH PE @@ -474,6 +504,11 @@ static int eeh_reset_device(struct eeh_pe *pe, struct pci_bus *bus) eeh_pe_restore_bars(pe); eeh_pe_state_clear(pe, EEH_PE_RESET); + /* Clear frozen state */ + rc = eeh_clear_pe_frozen_state(pe); + if (rc) + return rc; + /* Give the system 5 seconds to finish running the user-space * hotplug shutdown scripts, e.g. ifdown for ethernet. Yes, * this is a hack, but if we don't do this, and try to bring |