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powerpc/pseries: Update affinity for memory and cpus specified in a PRRN event 

Extend the existing PRRN infrastructure to perform the actual affinity
updating for cpus and memory in addition to the device tree updating.
For cpus, dynamic affinity updating already appears to exist in the
kernel in the form of arch_update_cpu_topology(). For memory, we must
place a READD operation on the hotplug queue for any phandle included in
the PRRN event that is determined to be an LMB.

Signed-off-by: John Allen <jallen@linux.vnet.ibm.com>
Reviewed-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
John Allen 2017-01-06 13:28:54 -06:00 committed by Michael Ellerman
parent e70d59700f
commit 675d8ee685
2 changed files with 40 additions and 1 deletions
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7
arch/powerpc/kernel/rtasd.c
View File

@ -21,6 +21,7 @@
#include <linux/cpu.h>
#include <linux/workqueue.h>
#include <linux/slab.h>
#include <linux/topology.h>
#include <linux/uaccess.h>
#include <asm/io.h>
@ -282,6 +283,7 @@ static void prrn_work_fn(struct work_struct *work)
* the RTAS event.
*/
pseries_devicetree_update(-prrn_update_scope);
arch_update_cpu_topology();
}
static DECLARE_WORK(prrn_work, prrn_work_fn);
@ -434,7 +436,10 @@ static void do_event_scan(void)
}
if (error == 0) {
pSeries_log_error(logdata, ERR_TYPE_RTAS_LOG, 0);
if (rtas_error_type((struct rtas_error_log *)logdata) !=
RTAS_TYPE_PRRN)
pSeries_log_error(logdata, ERR_TYPE_RTAS_LOG,
0);
handle_rtas_event((struct rtas_error_log *)logdata);
}

34
arch/powerpc/platforms/pseries/mobility.c
View File

@ -39,6 +39,7 @@ struct update_props_workarea {
#define ADD_DT_NODE 0x03000000
#define MIGRATION_SCOPE (1)
#define PRRN_SCOPE -2
static int mobility_rtas_call(int token, char *buf, s32 scope)
{
@ -236,6 +237,35 @@ static int add_dt_node(__be32 parent_phandle, __be32 drc_index)
return rc;
}
static void prrn_update_node(__be32 phandle)
{
struct pseries_hp_errorlog *hp_elog;
struct device_node *dn;
/*
* If a node is found from a the given phandle, the phandle does not
* represent the drc index of an LMB and we can ignore.
*/
dn = of_find_node_by_phandle(be32_to_cpu(phandle));
if (dn) {
of_node_put(dn);
return;
}
hp_elog = kzalloc(sizeof(*hp_elog), GFP_KERNEL);
if(!hp_elog)
return;
hp_elog->resource = PSERIES_HP_ELOG_RESOURCE_MEM;
hp_elog->action = PSERIES_HP_ELOG_ACTION_READD;
hp_elog->id_type = PSERIES_HP_ELOG_ID_DRC_INDEX;
hp_elog->_drc_u.drc_index = phandle;
queue_hotplug_event(hp_elog, NULL, NULL);
kfree(hp_elog);
}
int pseries_devicetree_update(s32 scope)
{
char *rtas_buf;
@ -274,6 +304,10 @@ int pseries_devicetree_update(s32 scope)
break;
case UPDATE_DT_NODE:
update_dt_node(phandle, scope);
if (scope == PRRN_SCOPE)
prrn_update_node(phandle);
break;
case ADD_DT_NODE:
drc_index = *data++;