mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-06 02:50:43 +00:00
powerpc/pseries: Perform full re-add of CPU for topology update post-migration
[ Upstream commit 81b6132492
]
On pseries systems, performing a partition migration can result in
altering the nodes a CPU is assigned to on the destination system. For
exampl, pre-migration on the source system CPUs are in node 1 and 3,
post-migration on the destination system CPUs are in nodes 2 and 3.
Handling the node change for a CPU can cause corruption in the slab
cache if we hit a timing where a CPUs node is changed while cache_reap()
is invoked. The corruption occurs because the slab cache code appears
to rely on the CPU and slab cache pages being on the same node.
The current dynamic updating of a CPUs node done in arch/powerpc/mm/numa.c
does not prevent us from hitting this scenario.
Changing the device tree property update notification handler that
recognizes an affinity change for a CPU to do a full DLPAR remove and
add of the CPU instead of dynamically changing its node resolves this
issue.
Signed-off-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: Michael W. Bringmann <mwb@linux.vnet.ibm.com>
Tested-by: Michael W. Bringmann <mwb@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
parent
405edea441
commit
1b4283ff5c
3 changed files with 22 additions and 8 deletions
|
@ -117,6 +117,8 @@ static inline int prrn_is_enabled(void)
|
|||
#define topology_sibling_cpumask(cpu) (per_cpu(cpu_sibling_map, cpu))
|
||||
#define topology_core_cpumask(cpu) (per_cpu(cpu_core_map, cpu))
|
||||
#define topology_core_id(cpu) (cpu_to_core_id(cpu))
|
||||
|
||||
int dlpar_cpu_readd(int cpu);
|
||||
#endif
|
||||
#endif
|
||||
|
||||
|
|
|
@ -1527,13 +1527,6 @@ static void reset_topology_timer(void)
|
|||
|
||||
#ifdef CONFIG_SMP
|
||||
|
||||
static void stage_topology_update(int core_id)
|
||||
{
|
||||
cpumask_or(&cpu_associativity_changes_mask,
|
||||
&cpu_associativity_changes_mask, cpu_sibling_mask(core_id));
|
||||
reset_topology_timer();
|
||||
}
|
||||
|
||||
static int dt_update_callback(struct notifier_block *nb,
|
||||
unsigned long action, void *data)
|
||||
{
|
||||
|
@ -1546,7 +1539,7 @@ static int dt_update_callback(struct notifier_block *nb,
|
|||
!of_prop_cmp(update->prop->name, "ibm,associativity")) {
|
||||
u32 core_id;
|
||||
of_property_read_u32(update->dn, "reg", &core_id);
|
||||
stage_topology_update(core_id);
|
||||
rc = dlpar_cpu_readd(core_id);
|
||||
rc = NOTIFY_OK;
|
||||
}
|
||||
break;
|
||||
|
|
|
@ -799,6 +799,25 @@ static int dlpar_cpu_add_by_count(u32 cpus_to_add)
|
|||
return rc;
|
||||
}
|
||||
|
||||
int dlpar_cpu_readd(int cpu)
|
||||
{
|
||||
struct device_node *dn;
|
||||
struct device *dev;
|
||||
u32 drc_index;
|
||||
int rc;
|
||||
|
||||
dev = get_cpu_device(cpu);
|
||||
dn = dev->of_node;
|
||||
|
||||
rc = of_property_read_u32(dn, "ibm,my-drc-index", &drc_index);
|
||||
|
||||
rc = dlpar_cpu_remove_by_index(drc_index);
|
||||
if (!rc)
|
||||
rc = dlpar_cpu_add(drc_index);
|
||||
|
||||
return rc;
|
||||
}
|
||||
|
||||
int dlpar_cpu(struct pseries_hp_errorlog *hp_elog)
|
||||
{
|
||||
u32 count, drc_index;
|
||||
|
|
Loading…
Reference in a new issue