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[POWERPC] EEH: support MMIO enable recovery step

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Update to the PowerPC PCI error recovery code.

Add code to enable MMIO if a device driver reports that it is capable
of recovering on its own.  One anticipated use of this having a device
driver enable MMIO so that it can take a register dump, which might
then be followed by the device driver requesting a full reset.

Signed-off-by: Linas Vepstas <linas@austin.ibm.com>
Signed-off-by: Paul Mackerras <paulus@samba.org>
This commit is contained in:
Linas Vepstas 2006-09-15 18:58:59 -05:00 committed by Paul Mackerras
parent 47b5c838af
commit 6a1ca373a1
1 changed files with 64 additions and 17 deletions
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81
arch/powerpc/platforms/pseries/eeh_driver.c
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@ -100,14 +100,38 @@ static void eeh_report_error(struct pci_dev *dev, void *userdata)
PCI_DN(dn)->eeh_mode |= EEH_MODE_IRQ_DISABLED;
disable_irq_nosync(dev->irq);
}
if (!driver->err_handler)
return;
if (!driver->err_handler->error_detected)
if (!driver->err_handler ||
!driver->err_handler->error_detected)
return;
rc = driver->err_handler->error_detected (dev, pci_channel_io_frozen);
if (*res == PCI_ERS_RESULT_NONE) *res = rc;
if (*res == PCI_ERS_RESULT_NEED_RESET) return;
if (*res == PCI_ERS_RESULT_DISCONNECT &&
rc == PCI_ERS_RESULT_NEED_RESET) *res = rc;
}
/**
* eeh_report_mmio_enabled - tell drivers that MMIO has been enabled
*
* Report an EEH error to each device driver, collect up and
* merge the device driver responses. Cumulative response
* passed back in "userdata".
*/
static void eeh_report_mmio_enabled(struct pci_dev *dev, void *userdata)
{
enum pci_ers_result rc, *res = userdata;
struct pci_driver *driver = dev->driver;
// dev->error_state = pci_channel_mmio_enabled;
if (!driver ||
!driver->err_handler ||
!driver->err_handler->mmio_enabled)
return;
rc = driver->err_handler->mmio_enabled (dev);
if (*res == PCI_ERS_RESULT_NONE) *res = rc;
if (*res == PCI_ERS_RESULT_DISCONNECT &&
rc == PCI_ERS_RESULT_NEED_RESET) *res = rc;
}
@ -118,6 +142,7 @@ static void eeh_report_error(struct pci_dev *dev, void *userdata)
static void eeh_report_reset(struct pci_dev *dev, void *userdata)
{
enum pci_ers_result rc, *res = userdata;
struct pci_driver *driver = dev->driver;
struct device_node *dn = pci_device_to_OF_node(dev);
@ -128,12 +153,14 @@ static void eeh_report_reset(struct pci_dev *dev, void *userdata)
PCI_DN(dn)->eeh_mode &= ~EEH_MODE_IRQ_DISABLED;
enable_irq(dev->irq);
}
if (!driver->err_handler)
return;
if (!driver->err_handler->slot_reset)
if (!driver->err_handler ||
!driver->err_handler->slot_reset)
return;
driver->err_handler->slot_reset(dev);
rc = driver->err_handler->slot_reset(dev);
if (*res == PCI_ERS_RESULT_NONE) *res = rc;
if (*res == PCI_ERS_RESULT_DISCONNECT &&
rc == PCI_ERS_RESULT_NEED_RESET) *res = rc;
}
/**
@ -362,22 +389,42 @@ struct pci_dn * handle_eeh_events (struct eeh_event *event)
goto hard_fail;
}
/* If all devices reported they can proceed, then re-enable MMIO */
if (result == PCI_ERS_RESULT_CAN_RECOVER) {
rc = rtas_pci_enable(frozen_pdn, EEH_THAW_MMIO);
if (rc) {
result = PCI_ERS_RESULT_NEED_RESET;
} else {
result = PCI_ERS_RESULT_NONE;
pci_walk_bus(frozen_bus, eeh_report_mmio_enabled, &result);
}
}
/* If all devices reported they can proceed, then re-enable DMA */
if (result == PCI_ERS_RESULT_CAN_RECOVER) {
rc = rtas_pci_enable(frozen_pdn, EEH_THAW_DMA);
if (rc)
result = PCI_ERS_RESULT_NEED_RESET;
}
/* If any device has a hard failure, then shut off everything. */
if (result == PCI_ERS_RESULT_DISCONNECT)
goto hard_fail;
/* If any device called out for a reset, then reset the slot */
if (result == PCI_ERS_RESULT_NEED_RESET) {
rc = eeh_reset_device(frozen_pdn, NULL);
if (rc)
goto hard_fail;
pci_walk_bus(frozen_bus, eeh_report_reset, NULL);
result = PCI_ERS_RESULT_NONE;
pci_walk_bus(frozen_bus, eeh_report_reset, &result);
}
/* If all devices reported they can proceed, the re-enable PIO */
if (result == PCI_ERS_RESULT_CAN_RECOVER) {
/* XXX Not supported; we brute-force reset the device */
rc = eeh_reset_device(frozen_pdn, NULL);
if (rc)
goto hard_fail;
pci_walk_bus(frozen_bus, eeh_report_reset, NULL);
}
/* All devices should claim they have recovered by now. */
if (result != PCI_ERS_RESULT_RECOVERED)
goto hard_fail;
/* Tell all device drivers that they can resume operations */
pci_walk_bus(frozen_bus, eeh_report_resume, NULL);