[PATCH V8 3/8] powerpc/memory: Parse new memory property to initialize structures.
Michael Bringmann
mwb at linux.vnet.ibm.com
Thu Oct 27 02:24:33 AEDT 2016
powerpc/memory: Add parallel routines to parse the new property
"ibm,dynamic-memory-v2" property when it is present, and then to
finish initialization of the relevant memory structures with the
operating system. This code is shared between the boot-time
initialization functions and the runtime functions for memory
hotplug, so it needs to be able to handle both formats.
[V2: Revise contant names.]
[V3: Fix loop that needed to scan all blocks defined by new, compressed
memory definition.
[V4: Added external function prototype definitions to header file
"prom.h" for use in other files.
Change a firmware architure vec check for scan actual device tree.
Delete an unused variable.
Small cleanups to comments.]
[V5: Resynchronize/resubmit]
[V6: No change]
[V7: Correct mail threading]
[v8: Insert more useful variable names]
Signed-off-by: Michael Bringmann <mwb at linux.vnet.ibm.com>
---
arch/powerpc/include/asm/prom.h | 12 +++
arch/powerpc/mm/numa.c | 146 +++++++++++++++++++++++++++++++++------
2 files changed, 135 insertions(+), 23 deletions(-)
diff --git a/arch/powerpc/include/asm/prom.h b/arch/powerpc/include/asm/prom.h
index 43a002b..7907c38 100644
--- a/arch/powerpc/include/asm/prom.h
+++ b/arch/powerpc/include/asm/prom.h
@@ -110,6 +110,18 @@ struct of_drconf_cell_v2 {
extern void read_drconf_cell_v2(struct of_drconf_cell_v2 *drmem,
const __be32 **cellp);
+extern void read_one_drc_info(int **info, char **drc_type, char **drc_name,
+ unsigned long int *fdi_p, unsigned long int *nsl_p,
+ unsigned long int *si_p, unsigned long int *ldi_p);
+
+static inline int dyn_mem_v2_len(int entries)
+{
+ int drconf_v2_cells = (n_mem_addr_cells + 4);
+ int drconf_v2_cells_len = (drconf_v2_cells * sizeof(unsigned int));
+ return (((entries) * drconf_v2_cells_len) +
+ (1 * sizeof(unsigned int)));
+}
+
/*
* There are two methods for telling firmware what our capabilities are.
* Newer machines have an "ibm,client-architecture-support" method on the
diff --git a/arch/powerpc/mm/numa.c b/arch/powerpc/mm/numa.c
index fe8e6e7..d3cf353 100644
--- a/arch/powerpc/mm/numa.c
+++ b/arch/powerpc/mm/numa.c
@@ -427,30 +427,55 @@ void read_drconf_cell_v2(struct of_drconf_cell_v2 *drmem, const __be32 **cellp)
EXPORT_SYMBOL(read_drconf_cell_v2);
/*
- * Retrieve and validate the ibm,dynamic-memory property of the device tree.
+ * Retrieve and validate the ibm,dynamic-memory[-v2] property of the
+ * device tree.
+ *
+ * The layout of the ibm,dynamic-memory property is a number N of memory
+ * block description list entries followed by N memory block description
+ * list entries. Each memory block description list entry contains
+ * information as laid out in the of_drconf_cell struct above.
*
- * The layout of the ibm,dynamic-memory property is a number N of memblock
- * list entries followed by N memblock list entries. Each memblock list entry
- * contains information as laid out in the of_drconf_cell struct above.
+ * The layout of the ibm,dynamic-memory-v2 property is a number N of memory
+ * block set description list entries, followed by N memory block set
+ * description set entries.
*/
static int of_get_drconf_memory(struct device_node *memory, const __be32 **dm)
{
const __be32 *prop;
u32 len, entries;
- prop = of_get_property(memory, "ibm,dynamic-memory", &len);
- if (!prop || len < sizeof(unsigned int))
- return 0;
+ if (firmware_has_feature(FW_FEATURE_DYN_MEM_V2)) {
- entries = of_read_number(prop++, 1);
+ prop = of_get_property(memory, "ibm,dynamic-memory-v2", &len);
+ if (!prop || len < sizeof(unsigned int))
+ return 0;
- /* Now that we know the number of entries, revalidate the size
- * of the property read in to ensure we have everything
- */
- if (len < (entries * (n_mem_addr_cells + 4) + 1) * sizeof(unsigned int))
- return 0;
+ entries = of_read_number(prop++, 1);
+
+ /* Now that we know the number of set entries, revalidate the
+ * size of the property read in to ensure we have everything.
+ */
+ if (len < dyn_mem_v2_len(entries))
+ return 0;
+
+ *dm = prop;
+ } else {
+ prop = of_get_property(memory, "ibm,dynamic-memory", &len);
+ if (!prop || len < sizeof(unsigned int))
+ return 0;
+
+ entries = of_read_number(prop++, 1);
+
+ /* Now that we know the number of entries, revalidate the size
+ * of the property read in to ensure we have everything
+ */
+ if (len < (entries * (n_mem_addr_cells + 4) + 1) *
+ sizeof(unsigned int))
+ return 0;
+
+ *dm = prop;
+ }
- *dm = prop;
return entries;
}
@@ -513,7 +538,7 @@ static int of_get_assoc_arrays(struct device_node *memory,
* This is like of_node_to_nid_single() for memory represented in the
* ibm,dynamic-reconfiguration-memory node.
*/
-static int of_drconf_to_nid_single(struct of_drconf_cell *drmem,
+static int of_drconf_to_nid_single(u32 drmem_flags, u32 drmem_aa_index,
struct assoc_arrays *aa)
{
int default_nid = 0;
@@ -521,16 +546,16 @@ static int of_drconf_to_nid_single(struct of_drconf_cell *drmem,
int index;
if (min_common_depth > 0 && min_common_depth <= aa->array_sz &&
- !(drmem->flags & DRCONF_MEM_AI_INVALID) &&
- drmem->aa_index < aa->n_arrays) {
- index = drmem->aa_index * aa->array_sz + min_common_depth - 1;
+ !(drmem_flags & DRCONF_MEM_AI_INVALID) &&
+ drmem_aa_index < aa->n_arrays) {
+ index = drmem_aa_index * aa->array_sz + min_common_depth - 1;
nid = of_read_number(&aa->arrays[index], 1);
if (nid == 0xffff || nid >= MAX_NUMNODES)
nid = default_nid;
if (nid > 0) {
- index = drmem->aa_index * aa->array_sz;
+ index = drmem_aa_index * aa->array_sz;
initialize_distance_lookup_table(nid,
&aa->arrays[index]);
}
@@ -665,7 +690,7 @@ static inline int __init read_usm_ranges(const __be32 **usm)
* Extract NUMA information from the ibm,dynamic-reconfiguration-memory
* node. This assumes n_mem_{addr,size}_cells have been set.
*/
-static void __init parse_drconf_memory(struct device_node *memory)
+static void __init parse_drconf_memory_v1(struct device_node *memory)
{
const __be32 *uninitialized_var(dm), *usm;
unsigned int n, rc, ranges, is_kexec_kdump = 0;
@@ -715,7 +740,8 @@ static void __init parse_drconf_memory(struct device_node *memory)
base = read_n_cells(n_mem_addr_cells, &usm);
size = read_n_cells(n_mem_size_cells, &usm);
}
- nid = of_drconf_to_nid_single(&drmem, &aa);
+ nid = of_drconf_to_nid_single(drmem.flags,
+ drmem.aa_index, &aa);
fake_numa_create_new_node(
((base + size) >> PAGE_SHIFT),
&nid);
@@ -728,6 +754,80 @@ static void __init parse_drconf_memory(struct device_node *memory)
}
}
+static void __init parse_drconf_memory_v2(struct device_node *memory)
+{
+ const __be32 *uninitialized_var(dm);
+ unsigned int num_lmb_sets, rc;
+ unsigned long lmb_size, base;
+ unsigned long size, sz;
+ int nid;
+ struct assoc_arrays aa = { .arrays = NULL };
+ const __be32 *prop;
+ u32 len;
+
+ prop = of_get_property(memory, "ibm,dynamic-memory-v2", &len);
+ if (!prop)
+ return;
+
+ num_lmb_sets = of_get_drconf_memory(memory, &dm);
+ if (!num_lmb_sets)
+ return;
+
+ lmb_size = of_get_lmb_size(memory);
+ if (!lmb_size)
+ return;
+
+ rc = of_get_assoc_arrays(memory, &aa);
+ if (rc)
+ return;
+
+ for (; num_lmb_sets != 0; num_lmb_sets--) {
+ struct of_drconf_cell_v2 drmem;
+ unsigned long nsl;
+
+ /* Get the current LMB set */
+ read_drconf_cell_v2(&drmem, &dm);
+ base = drmem.base_addr;
+ nsl = drmem.num_seq_lmbs;
+
+ /* Skip this block if the reserved bit is set in
+ * flags (0x80) or if the block is not assigned
+ * to this partition (0x8)
+ */
+ if ((drmem.flags & DRCONF_MEM_RESERVED)
+ || !(drmem.flags & DRCONF_MEM_ASSIGNED))
+ continue;
+
+ for (; nsl != 0; nsl--) {
+ size = lmb_size;
+
+ nid = of_drconf_to_nid_single(drmem.flags,
+ drmem.aa_index, &aa);
+ fake_numa_create_new_node(
+ ((base + size) >> PAGE_SHIFT),
+ &nid);
+ node_set_online(nid);
+ sz = numa_enforce_memory_limit(base, size);
+ if (sz)
+ memblock_set_node(base, sz,
+ &memblock.memory, nid);
+
+ base += sz;
+ }
+ }
+}
+
+static void __init parse_drconf_memory(struct device_node *memory)
+{
+ const __be32 *prop;
+ int len;
+ prop = of_get_property(memory, "ibm,dynamic-memory-v2", &len);
+ if (!prop || len < sizeof(unsigned int))
+ parse_drconf_memory_v1(memory);
+ else
+ parse_drconf_memory_v2(memory);
+}
+
static int __init parse_numa_properties(void)
{
struct device_node *memory;
@@ -1082,8 +1182,8 @@ static int hot_add_drconf_scn_to_nid(struct device_node *memory,
if ((scn_addr < drmem.base_addr)
|| (scn_addr >= (drmem.base_addr + lmb_size)))
continue;
-
- nid = of_drconf_to_nid_single(&drmem, &aa);
+ nid = of_drconf_to_nid_single(drmem.flags,
+ drmem.aa_index, &aa);
break;
}
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