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authorMichael Bringmann <mwb@linux.vnet.ibm.com>2017-12-01 17:19:43 -0600
committerMichael Ellerman <mpe@ellerman.id.au>2018-01-21 16:21:46 +1100
commite83636ac333441a17436a1fcd196308f59cd0b51 (patch)
tree80a281a75324573bfd27654fac52c5a4b04b86e5 /arch
parent3f38000eda485f466153d37c4f9201fb50cb03a3 (diff)
pseries/drc-info: Search DRC properties for CPU indexes
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 <mwb@linux.vnet.ibm.com> Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch')
-rw-r--r--arch/powerpc/include/asm/prom.h15
-rw-r--r--arch/powerpc/platforms/pseries/of_helpers.c60
-rw-r--r--arch/powerpc/platforms/pseries/pseries_energy.c126
3 files changed, 173 insertions, 28 deletions
diff --git a/arch/powerpc/include/asm/prom.h b/arch/powerpc/include/asm/prom.h
index 2ab5d732fefa..b04c5ce8191b 100644
--- a/arch/powerpc/include/asm/prom.h
+++ b/arch/powerpc/include/asm/prom.h
@@ -80,6 +80,21 @@ extern void of_instantiate_rtc(void);
extern int of_get_ibm_chip_id(struct device_node *np);
+struct of_drc_info {
+ char *drc_type;
+ char *drc_name_prefix;
+ u32 drc_index_start;
+ u32 drc_name_suffix_start;
+ u32 num_sequential_elems;
+ u32 sequential_inc;
+ u32 drc_power_domain;
+ u32 last_drc_index;
+};
+
+extern int of_read_drc_info_cell(struct property **prop,
+ const __be32 **curval, struct of_drc_info *data);
+
+
/*
* 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 7e75101fa522..6df192f38f80 100644
--- a/arch/powerpc/platforms/pseries/of_helpers.c
+++ b/arch/powerpc/platforms/pseries/of_helpers.c
@@ -3,6 +3,7 @@
#include <linux/err.h>
#include <linux/slab.h>
#include <linux/of.h>
+#include <asm/prom.h>
#include "of_helpers.h"
@@ -37,3 +38,62 @@ 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_read_drc_info_cell(struct property **prop, const __be32 **curval,
+ struct of_drc_info *data)
+{
+ const char *p;
+ const __be32 *p2;
+
+ if (!data)
+ return -EINVAL;
+
+ /* Get drc-type:encode-string */
+ p = data->drc_type = (char*) (*curval);
+ p = of_prop_next_string(*prop, p);
+ if (!p)
+ return -EINVAL;
+
+ /* Get drc-name-prefix:encode-string */
+ data->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, &data->drc_index_start);
+ if (!p2)
+ return -EINVAL;
+
+ /* Get drc-name-suffix-start:encode-int */
+ p2 = of_prop_next_u32(*prop, p2, &data->drc_name_suffix_start);
+ if (!p2)
+ return -EINVAL;
+
+ /* Get number-sequential-elements:encode-int */
+ p2 = of_prop_next_u32(*prop, p2, &data->num_sequential_elems);
+ if (!p2)
+ return -EINVAL;
+
+ /* Get sequential-increment:encode-int */
+ p2 = of_prop_next_u32(*prop, p2, &data->sequential_inc);
+ if (!p2)
+ return -EINVAL;
+
+ /* Get drc-power-domain:encode-int */
+ p2 = of_prop_next_u32(*prop, p2, &data->drc_power_domain);
+ if (!p2)
+ return -EINVAL;
+
+ /* Should now know end of current entry */
+ (*curval) = (void *)p2;
+ data->last_drc_index = data->drc_index_start +
+ ((data->num_sequential_elems - 1) * data->sequential_inc);
+
+ return 0;
+}
+EXPORT_SYMBOL(of_read_drc_info_cell);
diff --git a/arch/powerpc/platforms/pseries/pseries_energy.c b/arch/powerpc/platforms/pseries/pseries_energy.c
index 35c891aabef0..6ed22127391b 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"
@@ -38,26 +39,58 @@ static int sysfs_entries;
static u32 cpu_to_drc_index(int cpu)
{
struct device_node *dn = NULL;
- const int *indexes;
- int i;
+ int thread_index;
int rc = 1;
u32 ret = 0;
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];
+ thread_index = cpu_core_index_of_thread(cpu);
+
+ if (firmware_has_feature(FW_FEATURE_DRC_INFO)) {
+ struct property *info = NULL;
+ struct of_drc_info drc;
+ int j;
+ u32 num_set_entries;
+ const __be32 *value;
+
+ info = of_find_property(dn, "ibm,drc-info", NULL);
+ if (info == NULL)
+ goto err_of_node_put;
+
+ value = of_prop_next_u32(info, NULL, &num_set_entries);
+ if (!value)
+ goto err_of_node_put;
+
+ for (j = 0; j < num_set_entries; j++) {
+
+ of_read_drc_info_cell(&info, &value, &drc);
+ if (strncmp(drc.drc_type, "CPU", 3))
+ goto err;
+
+ if (thread_index < drc.last_drc_index)
+ break;
+ }
+
+ ret = drc.drc_index_start + (thread_index * drc.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 thread_index+1 will get the
+ * drc_index corresponding to core number thread_index.
+ */
+ ret = indexes[thread_index + 1];
+ }
+
rc = 0;
err_of_node_put:
@@ -72,34 +105,71 @@ static int drc_index_to_cpu(u32 drc_index)
{
struct device_node *dn = NULL;
const int *indexes;
- int i, cpu = 0;
+ int thread_index = 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;
+ struct of_drc_info drc;
+ int j;
+ u32 num_set_entries;
+ const __be32 *value;
+
+ info = of_find_property(dn, "ibm,drc-info", NULL);
+ if (info == NULL)
+ goto err_of_node_put;
+
+ value = of_prop_next_u32(info, NULL, &num_set_entries);
+ if (!value)
+ goto err_of_node_put;
+
+ for (j = 0; j < num_set_entries; j++) {
+
+ of_read_drc_info_cell(&info, &value, &drc);
+ if (strncmp(drc.drc_type, "CPU", 3))
+ goto err;
+
+ if (drc_index > drc.last_drc_index) {
+ cpu += drc.num_sequential_elems;
+ continue;
+ }
+ cpu += ((drc_index - drc.drc_index_start) /
+ drc.sequential_inc);
+
+ thread_index = 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_index = 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_index;
}
/*