pseries/drc-info: Provide parallel routines to convert between
drc_index and CPU numbers at runtime, using the older device-tree
properties ("ibm,drc-indexes", "ibm,drc-names", "ibm,drc-types"
and "ibm,drc-power-domains"), or the new property "ibm,drc-info".
Signed-off-by: Michael Bringmann <m...@linux.vnet.ibm.com>
---
arch/powerpc/include/asm/prom.h | 7 +
arch/powerpc/platforms/pseries/of_helpers.c | 79 ++++++++++++
arch/powerpc/platforms/pseries/pseries_energy.c | 150 +++++++++++++++++++----
3 files changed, 210 insertions(+), 26 deletions(-)
---
Changes in V2:
-- Minor changes to integrate to latest 4.13 code
diff --git a/arch/powerpc/include/asm/prom.h b/arch/powerpc/include/asm/prom.h
index 4fb02cc..d469d7c 100644
--- a/arch/powerpc/include/asm/prom.h
+++ b/arch/powerpc/include/asm/prom.h
@@ -96,6 +96,13 @@ struct of_drconf_cell {
#define DRCONF_MEM_AI_INVALID 0x00000040
#define DRCONF_MEM_RESERVED 0x00000080
+extern int of_one_drc_info(struct property **prop, void **curval,
+ char **dtype, char **dname,
+ u32 *drc_index_start_p,
+ u32 *num_sequential_elems_p,
+ u32 *sequential_inc_p,
+ u32 *last_drc_index_p);
+
/*
* 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/platforms/pseries/of_helpers.c
b/arch/powerpc/platforms/pseries/of_helpers.c
index 2798933..1d59939 100644
--- a/arch/powerpc/platforms/pseries/of_helpers.c
+++ b/arch/powerpc/platforms/pseries/of_helpers.c
@@ -36,3 +36,82 @@ struct device_node *pseries_of_derive_parent(const char
*path)
kfree(parent_path);
return parent ? parent : ERR_PTR(-EINVAL);
}
+
+
+/* Helper Routines to convert between drc_index to cpu numbers */
+
+int of_one_drc_info(struct property **prop, void **curval,
+ char **dtype, char **dname,
+ u32 *drc_index_start_p,
+ u32 *num_sequential_elems_p,
+ u32 *sequential_inc_p,
+ u32 *last_drc_index_p)
+{
+ char *drc_type, *drc_name_prefix;
+ u32 drc_index_start, num_sequential_elems, dummy;
+ u32 sequential_inc, last_drc_index;
+ const char *p;
+ const __be32 *p2;
+
+ drc_index_start = num_sequential_elems = 0;
+ sequential_inc = last_drc_index = 0;
+
+ /* Get drc-type:encode-string */
+ p = drc_type = (*curval);
+ p = of_prop_next_string(*prop, p);
+ if (!p)
+ return -EINVAL;
+
+ /* Get drc-name-prefix:encode-string */
+ drc_name_prefix = (char *)p;
+ p = of_prop_next_string(*prop, p);
+ if (!p)
+ return -EINVAL;
+
+ /* Get drc-index-start:encode-int */
+ p2 = (const __be32 *)p;
+ p2 = of_prop_next_u32(*prop, p2, &drc_index_start);
+ if (!p2)
+ return -EINVAL;
+
+ /* Get/skip drc-name-suffix-start:encode-int */
+ p2 = of_prop_next_u32(*prop, p2, &dummy);
+ if (!p)
+ return -EINVAL;
+
+ /* Get number-sequential-elements:encode-int */
+ p2 = of_prop_next_u32(*prop, p2, &num_sequential_elems);
+ if (!p2)
+ return -EINVAL;
+
+ /* Get sequential-increment:encode-int */
+ p2 = of_prop_next_u32(*prop, p2, &sequential_inc);
+ if (!p2)
+ return -EINVAL;
+
+ /* Get/skip drc-power-domain:encode-int */
+ p2 = of_prop_next_u32(*prop, p2, &dummy);
+ if (!p2)
+ return -EINVAL;
+
+ /* Should now know end of current entry */
+ (*curval) = (void *)p2;
+ last_drc_index = drc_index_start +
+ ((num_sequential_elems-1)*sequential_inc);
+
+ if (dtype)
+ *dtype = drc_type;
+ if (dname)
+ *dname = drc_name_prefix;
+ if (drc_index_start_p)
+ *drc_index_start_p = drc_index_start;
+ if (num_sequential_elems_p)
+ *num_sequential_elems_p = num_sequential_elems;
+ if (sequential_inc_p)
+ *sequential_inc_p = sequential_inc;
+ if (last_drc_index_p)
+ *last_drc_index_p = last_drc_index;
+
+ return 0;
+}
+EXPORT_SYMBOL(of_one_drc_info);
diff --git a/arch/powerpc/platforms/pseries/pseries_energy.c
b/arch/powerpc/platforms/pseries/pseries_energy.c
index 164a13d..865c2af 100644
--- a/arch/powerpc/platforms/pseries/pseries_energy.c
+++ b/arch/powerpc/platforms/pseries/pseries_energy.c
@@ -22,6 +22,7 @@
#include <asm/page.h>
#include <asm/hvcall.h>
#include <asm/firmware.h>
+#include <asm/prom.h>
#define MODULE_VERS "1.0"
@@ -38,7 +39,6 @@
static u32 cpu_to_drc_index(int cpu)
{
struct device_node *dn = NULL;
- const int *indexes;
int i;
int rc = 1;
u32 ret = 0;
@@ -46,18 +46,65 @@ static u32 cpu_to_drc_index(int cpu)
dn = of_find_node_by_path("/cpus");
if (dn == NULL)
goto err;
- indexes = of_get_property(dn, "ibm,drc-indexes", NULL);
- if (indexes == NULL)
- goto err_of_node_put;
+
/* Convert logical cpu number to core number */
i = cpu_core_index_of_thread(cpu);
- /*
- * The first element indexes[0] is the number of drc_indexes
- * returned in the list. Hence i+1 will get the drc_index
- * corresponding to core number i.
- */
- WARN_ON(i > indexes[0]);
- ret = indexes[i + 1];
+
+ if (firmware_has_feature(FW_FEATURE_DRC_INFO)) {
+ struct property *info = NULL;
+ int j, check_val = i;
+ u32 num_set_entries;
+ u32 drc_index_start = 0;
+ u32 last_drc_index = 0;
+ u32 num_sequential_elems = 0;
+ u32 sequential_inc = 0;
+ char *dtype;
+ char *dname;
+ void *value;
+
+ info = of_find_property(dn, "ibm,drc-info", NULL);
+ if (info == NULL)
+ goto err_of_node_put;
+
+ value = info->value;
+ value = (void *)of_prop_next_u32(info, value, &num_set_entries);
+ if (!value)
+ goto err_of_node_put;
+
+ for (j = 0; j < num_set_entries; j++) {
+
+ of_one_drc_info(&info, &value, &dtype, &dname,
+ &drc_index_start,
+ &num_sequential_elems,
+ &sequential_inc, &last_drc_index);
+ if (strcmp(dtype, "CPU"))
+ goto err;
+
+ if (check_val < last_drc_index)
+ break;
+
+ WARN_ON(((check_val-drc_index_start)%
+ sequential_inc) != 0);
+ }
+ WARN_ON((num_sequential_elems == 0) || (sequential_inc == 0));
+
+ ret = last_drc_index + (check_val*sequential_inc);
+ } else {
+ const __be32 *indexes;
+
+ indexes = of_get_property(dn, "ibm,drc-indexes", NULL);
+ if (indexes == NULL)
+ goto err_of_node_put;
+
+ /*
+ * The first element indexes[0] is the number of drc_indexes
+ * returned in the list. Hence i+1 will get the drc_index
+ * corresponding to core number i.
+ */
+ WARN_ON(i > indexes[0]);
+ ret = indexes[i + 1];
+ }
+
rc = 0;
err_of_node_put:
@@ -72,34 +119,85 @@ static int drc_index_to_cpu(u32 drc_index)
{
struct device_node *dn = NULL;
const int *indexes;
- int i, cpu = 0;
+ int thread = 0, cpu = 0;
int rc = 1;
dn = of_find_node_by_path("/cpus");
if (dn == NULL)
goto err;
- indexes = of_get_property(dn, "ibm,drc-indexes", NULL);
- if (indexes == NULL)
- goto err_of_node_put;
- /*
- * First element in the array is the number of drc_indexes
- * returned. Search through the list to find the matching
- * drc_index and get the core number
- */
- for (i = 0; i < indexes[0]; i++) {
- if (indexes[i + 1] == drc_index)
+
+ if (firmware_has_feature(FW_FEATURE_DRC_INFO)) {
+ struct property *info = NULL;
+ int j;
+ u32 num_set_entries;
+ u32 drc_index_start = 0;
+ u32 last_drc_index = 0;
+ u32 num_sequential_elems = 0;
+ u32 sequential_inc = 0;
+ char *dtype, *dname;
+ void *value;
+
+ info = of_find_property(dn, "ibm,drc-info", NULL);
+ if (info == NULL)
+ goto err_of_node_put;
+
+ value = info->value;
+ value = (void *)of_prop_next_u32(info, value, &num_set_entries);
+ if (!value)
+ goto err_of_node_put;
+
+ for (j = 0; j < num_set_entries; j++) {
+
+ of_one_drc_info(&info, &value, &dtype, &dname,
+ &drc_index_start,
+ &num_sequential_elems,
+ &sequential_inc, &last_drc_index);
+ if (strcmp(dtype, "CPU"))
+ goto err;
+
+ WARN_ON(drc_index < drc_index_start);
+ WARN_ON(((drc_index-drc_index_start)%
+ sequential_inc) != 0);
+
+ if (drc_index > last_drc_index) {
+ cpu += ((last_drc_index-drc_index_start)/
+ sequential_inc);
+ continue;
+ } else {
+ cpu += ((drc_index-drc_index_start)/
+ sequential_inc);
+ }
+
+ thread = cpu_first_thread_of_core(cpu);
+ rc = 0;
break;
+ }
+ } else {
+ unsigned long int i;
+
+ indexes = of_get_property(dn, "ibm,drc-indexes", NULL);
+ if (indexes == NULL)
+ goto err_of_node_put;
+ /*
+ * First element in the array is the number of drc_indexes
+ * returned. Search through the list to find the matching
+ * drc_index and get the core number
+ */
+ for (i = 0; i < indexes[0]; i++) {
+ if (indexes[i + 1] == drc_index)
+ break;
+ }
+ /* Convert core number to logical cpu number */
+ thread = cpu_first_thread_of_core(i);
+ rc = 0;
}
- /* Convert core number to logical cpu number */
- cpu = cpu_first_thread_of_core(i);
- rc = 0;
err_of_node_put:
of_node_put(dn);
err:
if (rc)
printk(KERN_WARNING "drc_index_to_cpu(%d) failed", drc_index);
- return cpu;
+ return thread;
}
/*
