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powerpc/pseries: Dynamic add entires to associativity lookup array 

Dynamically add entries to the associativity lookup array

The ibm,associativity-lookup-arrays property may only contain
associativity arrays for LMBs present at boot time. When hotplug
adding a LMB its associativity array may not be in the associativity
lookup array, this patch adds the ability to add new entries to the
associativity lookup array.

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 2016-06-20 09:01:38 -05:00 committed by Michael Ellerman
parent c2101c9039
commit c05a5a4096
1 changed files with 68 additions and 27 deletions
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95
arch/powerpc/platforms/pseries/hotplug-memory.c
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@ -191,14 +191,74 @@ static int dlpar_update_device_tree_lmb(struct of_drconf_cell *lmb)
return 0;
}
static u32 find_aa_index(struct device_node *dr_node,
struct property *ala_prop, const u32 *lmb_assoc)
{
u32 *assoc_arrays;
u32 aa_index;
int aa_arrays, aa_array_entries, aa_array_sz;
int i, index;
/*
* The ibm,associativity-lookup-arrays property is defined to be
* a 32-bit value specifying the number of associativity arrays
* followed by a 32-bitvalue specifying the number of entries per
* array, followed by the associativity arrays.
*/
assoc_arrays = ala_prop->value;
aa_arrays = be32_to_cpu(assoc_arrays[0]);
aa_array_entries = be32_to_cpu(assoc_arrays[1]);
aa_array_sz = aa_array_entries * sizeof(u32);
aa_index = -1;
for (i = 0; i < aa_arrays; i++) {
index = (i * aa_array_entries) + 2;
if (memcmp(&assoc_arrays[index], &lmb_assoc[1], aa_array_sz))
continue;
aa_index = i;
break;
}
if (aa_index == -1) {
struct property *new_prop;
u32 new_prop_size;
new_prop_size = ala_prop->length + aa_array_sz;
new_prop = dlpar_clone_property(ala_prop, new_prop_size);
if (!new_prop)
return -1;
assoc_arrays = new_prop->value;
/* increment the number of entries in the lookup array */
assoc_arrays[0] = cpu_to_be32(aa_arrays + 1);
/* copy the new associativity into the lookup array */
index = aa_arrays * aa_array_entries + 2;
memcpy(&assoc_arrays[index], &lmb_assoc[1], aa_array_sz);
of_update_property(dr_node, new_prop);
/*
* The associativity lookup array index for this lmb is
* number of entries - 1 since we added its associativity
* to the end of the lookup array.
*/
aa_index = be32_to_cpu(assoc_arrays[0]) - 1;
}
return aa_index;
}
static u32 lookup_lmb_associativity_index(struct of_drconf_cell *lmb)
{
struct device_node *parent, *lmb_node, *dr_node;
struct property *ala_prop;
const u32 *lmb_assoc;
const u32 *assoc_arrays;
u32 aa_index;
int aa_arrays, aa_array_entries, aa_array_sz;
int i;
parent = of_find_node_by_path("/");
if (!parent)
@ -222,34 +282,15 @@ static u32 lookup_lmb_associativity_index(struct of_drconf_cell *lmb)
return -ENODEV;
}
assoc_arrays = of_get_property(dr_node,
"ibm,associativity-lookup-arrays",
NULL);
of_node_put(dr_node);
if (!assoc_arrays) {
ala_prop = of_find_property(dr_node, "ibm,associativity-lookup-arrays",
NULL);
if (!ala_prop) {
of_node_put(dr_node);
dlpar_free_cc_nodes(lmb_node);
return -ENODEV;
}
/* The ibm,associativity-lookup-arrays property is defined to be
* a 32-bit value specifying the number of associativity arrays
* followed by a 32-bitvalue specifying the number of entries per
* array, followed by the associativity arrays.
*/
aa_arrays = be32_to_cpu(assoc_arrays[0]);
aa_array_entries = be32_to_cpu(assoc_arrays[1]);
aa_array_sz = aa_array_entries * sizeof(u32);
aa_index = -1;
for (i = 0; i < aa_arrays; i++) {
int indx = (i * aa_array_entries) + 2;
if (memcmp(&assoc_arrays[indx], &lmb_assoc[1], aa_array_sz))
continue;
aa_index = i;
break;
}
aa_index = find_aa_index(dr_node, ala_prop, lmb_assoc);
dlpar_free_cc_nodes(lmb_node);
return aa_index;