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powerpc/eeh: Global mutex to protect PE tree

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We have missed lots of situations where the PE hierarchy tree need
protection through the EEH global mutex. The patch fixes that for
those public APIs implemented in eeh_pe.c. The only exception is
eeh_pe_restore_bars() because it calls eeh_pe_dev_traverse(), which
has been protected by the mutex.

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 2012-09-11 19:16:18 +00:00 committed by Benjamin Herrenschmidt
parent 20ee6a9708
commit ea81245cf4
1 changed files with 32 additions and 7 deletions
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39
arch/powerpc/platforms/pseries/eeh_pe.c
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@ -99,8 +99,6 @@ static struct eeh_pe *eeh_phb_pe_get(struct pci_controller *phb)
{
struct eeh_pe *pe;
eeh_lock();
list_for_each_entry(pe, &eeh_phb_pe, child) {
/*
* Actually, we needn't check the type since
@ -114,8 +112,6 @@ static struct eeh_pe *eeh_phb_pe_get(struct pci_controller *phb)
}
}
eeh_unlock();
return NULL;
}
@ -192,14 +188,21 @@ void *eeh_pe_dev_traverse(struct eeh_pe *root,
return NULL;
}
eeh_lock();
/* Traverse root PE */
for (pe = root; pe; pe = eeh_pe_next(pe, root)) {
eeh_pe_for_each_dev(pe, edev) {
ret = fn(edev, flag);
if (ret) return ret;
if (ret) {
eeh_unlock();
return ret;
}
}
}
eeh_unlock();
return NULL;
}
@ -251,9 +254,7 @@ static struct eeh_pe *eeh_pe_get(struct eeh_dev *edev)
struct eeh_pe *root = eeh_phb_pe_get(edev->phb);
struct eeh_pe *pe;
eeh_lock();
pe = eeh_pe_traverse(root, __eeh_pe_get, edev);
eeh_unlock();
return pe;
}
@ -307,6 +308,8 @@ int eeh_add_to_parent_pe(struct eeh_dev *edev)
{
struct eeh_pe *pe, *parent;
eeh_lock();
/*
* Search the PE has been existing or not according
* to the PE address. If that has been existing, the
@ -316,6 +319,7 @@ int eeh_add_to_parent_pe(struct eeh_dev *edev)
pe = eeh_pe_get(edev);
if (pe && !(pe->type & EEH_PE_INVALID)) {
if (!edev->pe_config_addr) {
eeh_unlock();
pr_err("%s: PE with addr 0x%x already exists\n",
__func__, edev->config_addr);
return -EEXIST;
@ -327,6 +331,7 @@ int eeh_add_to_parent_pe(struct eeh_dev *edev)
/* Put the edev to PE */
list_add_tail(&edev->list, &pe->edevs);
eeh_unlock();
pr_debug("EEH: Add %s to Bus PE#%x\n",
edev->dn->full_name, pe->addr);
@ -345,6 +350,7 @@ int eeh_add_to_parent_pe(struct eeh_dev *edev)
parent->type &= ~EEH_PE_INVALID;
parent = parent->parent;
}
eeh_unlock();
pr_debug("EEH: Add %s to Device PE#%x, Parent PE#%x\n",
edev->dn->full_name, pe->addr, pe->parent->addr);
@ -354,6 +360,7 @@ int eeh_add_to_parent_pe(struct eeh_dev *edev)
/* Create a new EEH PE */
pe = eeh_pe_alloc(edev->phb, EEH_PE_DEVICE);
if (!pe) {
eeh_unlock();
pr_err("%s: out of memory!\n", __func__);
return -ENOMEM;
}
@ -370,6 +377,7 @@ int eeh_add_to_parent_pe(struct eeh_dev *edev)
if (!parent) {
parent = eeh_phb_pe_get(edev->phb);
if (!parent) {
eeh_unlock();
pr_err("%s: No PHB PE is found (PHB Domain=%d)\n",
__func__, edev->phb->global_number);
edev->pe = NULL;
@ -386,6 +394,7 @@ int eeh_add_to_parent_pe(struct eeh_dev *edev)
list_add_tail(&pe->child, &parent->child_list);
list_add_tail(&edev->list, &pe->edevs);
edev->pe = pe;
eeh_unlock();
pr_debug("EEH: Add %s to Device PE#%x, Parent PE#%x\n",
edev->dn->full_name, pe->addr, pe->parent->addr);
@ -413,6 +422,8 @@ int eeh_rmv_from_parent_pe(struct eeh_dev *edev, int purge_pe)
return -EEXIST;
}
eeh_lock();
/* Remove the EEH device */
pe = edev->pe;
edev->pe = NULL;
@ -457,6 +468,8 @@ int eeh_rmv_from_parent_pe(struct eeh_dev *edev, int purge_pe)
pe = parent;
}
eeh_unlock();
return 0;
}
@ -502,7 +515,9 @@ static void *__eeh_pe_state_mark(void *data, void *flag)
*/
void eeh_pe_state_mark(struct eeh_pe *pe, int state)
{
eeh_lock();
eeh_pe_traverse(pe, __eeh_pe_state_mark, &state);
eeh_unlock();
}
/**
@ -536,7 +551,9 @@ static void *__eeh_pe_state_clear(void *data, void *flag)
*/
void eeh_pe_state_clear(struct eeh_pe *pe, int state)
{
eeh_lock();
eeh_pe_traverse(pe, __eeh_pe_state_clear, &state);
eeh_unlock();
}
/**
@ -598,6 +615,10 @@ static void *eeh_restore_one_device_bars(void *data, void *flag)
*/
void eeh_pe_restore_bars(struct eeh_pe *pe)
{
/*
* We needn't take the EEH lock since eeh_pe_dev_traverse()
* will take that.
*/
eeh_pe_dev_traverse(pe, eeh_restore_one_device_bars, NULL);
}
@ -617,6 +638,8 @@ struct pci_bus *eeh_pe_bus_get(struct eeh_pe *pe)
struct eeh_dev *edev;
struct pci_dev *pdev;
eeh_lock();
if (pe->type & EEH_PE_PHB) {
bus = pe->phb->bus;
} else if (pe->type & EEH_PE_BUS) {
@ -626,5 +649,7 @@ struct pci_bus *eeh_pe_bus_get(struct eeh_pe *pe)
bus = pdev->bus;
}
eeh_unlock();
return bus;
}