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powerpc/eeh: Make the delay for PE reset unified 

Basically, we have 3 types of resets to fulfil PE reset: fundamental,
hot and PHB reset. For the later 2 cases, we need PCI bus reset hold
and settlement delay as specified by PCI spec. PowerNV and pSeries
platforms are running on top of different firmware and some of the
delays have been covered by underly firmware (PowerNV).

The patch makes the delays unified to be done in backend, instead of
EEH core.

Signed-off-by: Gavin Shan <gwshan@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Gavin Shan 2014-04-24 18:00:23 +10:00 committed by Benjamin Herrenschmidt
parent fd5cee7ce8
commit 26833a5029
4 changed files with 30 additions and 15 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

10
arch/powerpc/include/asm/eeh.h
View File

@ -38,6 +38,16 @@ struct device_node;
#define EEH_PROBE_MODE_DEV 0x4 /* From PCI device */
#define EEH_PROBE_MODE_DEVTREE 0x8 /* From device tree */
/*
* Delay for PE reset, all in ms
*
* PCI specification has reset hold time of 100 milliseconds.
* We have 250 milliseconds here. The PCI bus settlement time
* is specified as 1.5 seconds and we have 1.8 seconds.
*/
#define EEH_PE_RST_HOLD_TIME 250
#define EEH_PE_RST_SETTLE_TIME 1800
/*
* The struct is used to trace PE related EEH functionality.
* In theory, there will have one instance of the struct to

13
arch/powerpc/kernel/eeh.c
View File

@ -639,20 +639,7 @@ static void eeh_reset_pe_once(struct eeh_pe *pe)
else
eeh_ops->reset(pe, EEH_RESET_HOT);
/* The PCI bus requires that the reset be held high for at least
* a 100 milliseconds. We wait a bit longer 'just in case'.
*/
#define PCI_BUS_RST_HOLD_TIME_MSEC 250
msleep(PCI_BUS_RST_HOLD_TIME_MSEC);
eeh_ops->reset(pe, EEH_RESET_DEACTIVATE);
/* After a PCI slot has been reset, the PCI Express spec requires
* a 1.5 second idle time for the bus to stabilize, before starting
* up traffic.
*/
#define PCI_BUS_SETTLE_TIME_MSEC 1800
msleep(PCI_BUS_SETTLE_TIME_MSEC);
}
/**

12
arch/powerpc/platforms/powernv/eeh-ioda.c
View File

@ -417,9 +417,13 @@ static int ioda_eeh_phb_reset(struct pci_controller *hose, int option)
/*
* Poll state of the PHB until the request is done
* successfully.
* successfully. The PHB reset is usually PHB complete
* reset followed by hot reset on root bus. So we also
* need the PCI bus settlement delay.
*/
rc = ioda_eeh_phb_poll(phb);
if (option == EEH_RESET_DEACTIVATE)
msleep(EEH_PE_RST_SETTLE_TIME);
out:
if (rc != OPAL_SUCCESS)
return -EIO;
@ -457,6 +461,8 @@ static int ioda_eeh_root_reset(struct pci_controller *hose, int option)
/* Poll state of the PHB until the request is done */
rc = ioda_eeh_phb_poll(phb);
if (option == EEH_RESET_DEACTIVATE)
msleep(EEH_PE_RST_SETTLE_TIME);
out:
if (rc != OPAL_SUCCESS)
return -EIO;
@ -480,11 +486,15 @@ static int ioda_eeh_bridge_reset(struct pci_dev *dev, int option)
eeh_ops->read_config(dn, PCI_BRIDGE_CONTROL, 2, &ctrl);
ctrl |= PCI_BRIDGE_CTL_BUS_RESET;
eeh_ops->write_config(dn, PCI_BRIDGE_CONTROL, 2, ctrl);
msleep(EEH_PE_RST_HOLD_TIME);
break;
case EEH_RESET_DEACTIVATE:
eeh_ops->read_config(dn, PCI_BRIDGE_CONTROL, 2, &ctrl);
ctrl &= ~PCI_BRIDGE_CTL_BUS_RESET;
eeh_ops->write_config(dn, PCI_BRIDGE_CONTROL, 2, ctrl);
msleep(EEH_PE_RST_SETTLE_TIME);
break;
}

10
arch/powerpc/platforms/pseries/eeh_pseries.c
View File

@ -532,11 +532,19 @@ static int pseries_eeh_reset(struct eeh_pe *pe, int option)
/* If fundamental-reset not supported, try hot-reset */
if (option == EEH_RESET_FUNDAMENTAL &&
ret == -8) {
option = EEH_RESET_HOT;
ret = rtas_call(ibm_set_slot_reset, 4, 1, NULL,
config_addr, BUID_HI(pe->phb->buid),
BUID_LO(pe->phb->buid), EEH_RESET_HOT);
BUID_LO(pe->phb->buid), option);
}
/* We need reset hold or settlement delay */
if (option == EEH_RESET_FUNDAMENTAL ||
option == EEH_RESET_HOT)
msleep(EEH_PE_RST_HOLD_TIME);
else
msleep(EEH_PE_RST_SETTLE_TIME);
return ret;
}