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powerpc/eeh: Dump PE location code

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As Ben suggested, it's meaningful to dump PE's location code
for site engineers when hitting EEH errors. The patch introduces
function eeh_pe_loc_get() to retireve the location code from
dev-tree so that we can output it when hitting EEH errors.

If primary PE bus is root bus, the PHB's dev-node would be tried
prior to root port's dev-node. Otherwise, the upstream bridge's
dev-node of the primary PE bus will be check for the location code
directly.

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
2014-06-11 18:26:44 +10:00
committed by Benjamin Herrenschmidt
parent d4e58e5928
commit 357b2f3dd9
4 changed files with 84 additions and 11 deletions
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13
arch/powerpc/kernel/eeh.c
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@@ -330,8 +330,8 @@ static int eeh_phb_check_failure(struct eeh_pe *pe)
eeh_pe_state_mark(phb_pe, EEH_PE_ISOLATED);
eeh_serialize_unlock(flags);
pr_err("EEH: PHB#%x failure detected\n",
phb_pe->phb->global_number);
pr_err("EEH: PHB#%x failure detected, location: %s\n",
phb_pe->phb->global_number, eeh_pe_loc_get(phb_pe));
dump_stack();
eeh_send_failure_event(phb_pe);
@@ -362,7 +362,7 @@ int eeh_dev_check_failure(struct eeh_dev *edev)
unsigned long flags;
struct device_node *dn;
struct pci_dev *dev;
struct eeh_pe *pe, *parent_pe;
struct eeh_pe *pe, *parent_pe, *phb_pe;
int rc = 0;
const char *location;
@@ -481,8 +481,11 @@ int eeh_dev_check_failure(struct eeh_dev *edev)
* a stack trace will help the device-driver authors figure
* out what happened. So print that out.
*/
pr_err("EEH: Frozen PE#%x detected on PHB#%x\n",
pe->addr, pe->phb->global_number);
phb_pe = eeh_phb_pe_get(pe->phb);
pr_err("EEH: Frozen PHB#%x-PE#%x detected\n",
pe->phb->global_number, pe->addr);
pr_err("EEH: PE location: %s, PHB location: %s\n",
eeh_pe_loc_get(pe), eeh_pe_loc_get(phb_pe));
dump_stack();
eeh_send_failure_event(pe);