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powerpc/pseries/memory-hotplug: Only update DT once per memory DLPAR request

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The updates to powerpc numa and memory hotplug code now use the
in-kernel LMB array instead of the device tree. This change allows the
pseries memory DLPAR code to only update the device tree once after
successfully handling a DLPAR request.

Prior to the in-kernel LMB array, the numa code looked up the affinity
for memory being added in the device tree, the code now looks this up
in the LMB array. This change means the memory hotplug code can just
update the affinity for an LMB in the LMB array instead of updating
the device tree.

This also provides a savings in kernel memory. When updating the
device tree old properties are never free'ed since there is no
usecount on properties. This behavior leads to a new copy of the
property being allocated every time a LMB is added or removed (i.e. a
request to add 100 LMBs creates 100 new copies of the property). With
this update only a single new property is created when a DLPAR request
completes successfully.

Signed-off-by: Nathan Fontenot <nfont@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Nathan Fontenot 2018-04-20 15:29:48 -05:00 committed by Michael Ellerman
parent 6977f95e63
commit 063b8b1251
2 changed files with 21 additions and 39 deletions
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5
arch/powerpc/include/asm/drmem.h
View File

@ -99,4 +99,9 @@ void __init walk_drmem_lmbs_early(unsigned long node,
void (*func)(struct drmem_lmb *, const __be32 **));
#endif
static inline void invalidate_lmb_associativity_index(struct drmem_lmb *lmb)
{
lmb->aa_index = 0xffffffff;
}
#endif /* _ASM_POWERPC_LMB_H */

55
arch/powerpc/platforms/pseries/hotplug-memory.c
View File

@ -163,7 +163,7 @@ static u32 find_aa_index(struct device_node *dr_node,
return aa_index;
}
static u32 lookup_lmb_associativity_index(struct drmem_lmb *lmb)
static int update_lmb_associativity_index(struct drmem_lmb *lmb)
{
struct device_node *parent, *lmb_node, *dr_node;
struct property *ala_prop;
@ -203,43 +203,14 @@ static u32 lookup_lmb_associativity_index(struct drmem_lmb *lmb)
aa_index = find_aa_index(dr_node, ala_prop, lmb_assoc);
dlpar_free_cc_nodes(lmb_node);
return aa_index;
}
static int dlpar_add_device_tree_lmb(struct drmem_lmb *lmb)
{
int rc, aa_index;
lmb->flags |= DRCONF_MEM_ASSIGNED;
aa_index = lookup_lmb_associativity_index(lmb);
if (aa_index < 0) {
pr_err("Couldn't find associativity index for drc index %x\n",
lmb->drc_index);
return aa_index;
pr_err("Could not find LMB associativity\n");
return -1;
}
lmb->aa_index = aa_index;
rtas_hp_event = true;
rc = drmem_update_dt();
rtas_hp_event = false;
return rc;
}
static int dlpar_remove_device_tree_lmb(struct drmem_lmb *lmb)
{
int rc;
lmb->flags &= ~DRCONF_MEM_ASSIGNED;
lmb->aa_index = 0xffffffff;
rtas_hp_event = true;
rc = drmem_update_dt();
rtas_hp_event = false;
return rc;
return 0;
}
static struct memory_block *lmb_to_memblock(struct drmem_lmb *lmb)
@ -428,7 +399,9 @@ static int dlpar_remove_lmb(struct drmem_lmb *lmb)
/* Update memory regions for memory remove */
memblock_remove(lmb->base_addr, block_sz);
dlpar_remove_device_tree_lmb(lmb);
invalidate_lmb_associativity_index(lmb);
lmb->flags &= ~DRCONF_MEM_ASSIGNED;
return 0;
}
@ -688,10 +661,8 @@ static int dlpar_add_lmb(struct drmem_lmb *lmb)
if (lmb->flags & DRCONF_MEM_ASSIGNED)
return -EINVAL;
rc = dlpar_add_device_tree_lmb(lmb);
rc = update_lmb_associativity_index(lmb);
if (rc) {
pr_err("Couldn't update device tree for drc index %x\n",
lmb->drc_index);
dlpar_release_drc(lmb->drc_index);
return rc;
}
@ -704,14 +675,14 @@ static int dlpar_add_lmb(struct drmem_lmb *lmb)
/* Add the memory */
rc = add_memory(nid, lmb->base_addr, block_sz);
if (rc) {
dlpar_remove_device_tree_lmb(lmb);
invalidate_lmb_associativity_index(lmb);
return rc;
}
rc = dlpar_online_lmb(lmb);
if (rc) {
remove_memory(nid, lmb->base_addr, block_sz);
dlpar_remove_device_tree_lmb(lmb);
invalidate_lmb_associativity_index(lmb);
} else {
lmb->flags |= DRCONF_MEM_ASSIGNED;
}
@ -958,6 +929,12 @@ int dlpar_memory(struct pseries_hp_errorlog *hp_elog)
break;
}
if (!rc) {
rtas_hp_event = true;
rc = drmem_update_dt();
rtas_hp_event = false;
}
unlock_device_hotplug();
return rc;
}