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powerpc/eeh: I/O chip EEH state retrieval 

The patch adds I/O chip backend to retrieve the state for the
indicated PE. While the PE state is temperarily unavailable,
the upper layer (powernv platform) should return default delay
(1 second).

Signed-off-by: Gavin Shan <shangw@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Gavin Shan 2013-06-20 13:21:09 +08:00 committed by Benjamin Herrenschmidt
parent eb0059836b
commit 8c41a7f3f7
1 changed files with 98 additions and 1 deletions
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99
arch/powerpc/platforms/powernv/eeh-ioda.c
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@ -116,10 +116,107 @@ static int ioda_eeh_set_option(struct eeh_pe *pe, int option)
return ret;
}
/**
* ioda_eeh_get_state - Retrieve the state of PE
* @pe: EEH PE
*
* The PE's state should be retrieved from the PEEV, PEST
* IODA tables. Since the OPAL has exported the function
* to do it, it'd better to use that.
*/
static int ioda_eeh_get_state(struct eeh_pe *pe)
{
s64 ret = 0;
u8 fstate;
u16 pcierr;
u32 pe_no;
int result;
struct pci_controller *hose = pe->phb;
struct pnv_phb *phb = hose->private_data;
/*
* Sanity check on PE address. The PHB PE address should
* be zero.
*/
if (pe->addr < 0 || pe->addr >= phb->ioda.total_pe) {
pr_err("%s: PE address %x out of range [0, %x] "
"on PHB#%x\n",
__func__, pe->addr, phb->ioda.total_pe,
hose->global_number);
return EEH_STATE_NOT_SUPPORT;
}
/* Retrieve PE status through OPAL */
pe_no = pe->addr;
ret = opal_pci_eeh_freeze_status(phb->opal_id, pe_no,
&fstate, &pcierr, NULL);
if (ret) {
pr_err("%s: Failed to get EEH status on "
"PHB#%x-PE#%x\n, err=%lld\n",
__func__, hose->global_number, pe_no, ret);
return EEH_STATE_NOT_SUPPORT;
}
/* Check PHB status */
if (pe->type & EEH_PE_PHB) {
result = 0;
result &= ~EEH_STATE_RESET_ACTIVE;
if (pcierr != OPAL_EEH_PHB_ERROR) {
result |= EEH_STATE_MMIO_ACTIVE;
result |= EEH_STATE_DMA_ACTIVE;
result |= EEH_STATE_MMIO_ENABLED;
result |= EEH_STATE_DMA_ENABLED;
}
return result;
}
/* Parse result out */
result = 0;
switch (fstate) {
case OPAL_EEH_STOPPED_NOT_FROZEN:
result &= ~EEH_STATE_RESET_ACTIVE;
result |= EEH_STATE_MMIO_ACTIVE;
result |= EEH_STATE_DMA_ACTIVE;
result |= EEH_STATE_MMIO_ENABLED;
result |= EEH_STATE_DMA_ENABLED;
break;
case OPAL_EEH_STOPPED_MMIO_FREEZE:
result &= ~EEH_STATE_RESET_ACTIVE;
result |= EEH_STATE_DMA_ACTIVE;
result |= EEH_STATE_DMA_ENABLED;
break;
case OPAL_EEH_STOPPED_DMA_FREEZE:
result &= ~EEH_STATE_RESET_ACTIVE;
result |= EEH_STATE_MMIO_ACTIVE;
result |= EEH_STATE_MMIO_ENABLED;
break;
case OPAL_EEH_STOPPED_MMIO_DMA_FREEZE:
result &= ~EEH_STATE_RESET_ACTIVE;
break;
case OPAL_EEH_STOPPED_RESET:
result |= EEH_STATE_RESET_ACTIVE;
break;
case OPAL_EEH_STOPPED_TEMP_UNAVAIL:
result |= EEH_STATE_UNAVAILABLE;
break;
case OPAL_EEH_STOPPED_PERM_UNAVAIL:
result |= EEH_STATE_NOT_SUPPORT;
break;
default:
pr_warning("%s: Unexpected EEH status 0x%x "
"on PHB#%x-PE#%x\n",
__func__, fstate, hose->global_number, pe_no);
}
return result;
}
struct pnv_eeh_ops ioda_eeh_ops = {
.post_init = ioda_eeh_post_init,
.set_option = ioda_eeh_set_option,
.get_state = NULL,
.get_state = ioda_eeh_get_state,
.reset = NULL,
.get_log = NULL,
.configure_bridge = NULL,