[PATCH v6 07/12] drivers: base cacheinfo: Add support for ACPI based firmware tables

Jeremy Linton
2018-01-13T00:59:15Z

Add a entry to to struct cacheinfo to maintain a reference to the PPTT
node which can be used to match identical caches across cores. Also
stub out cache_setup_acpi() so that individual architectures can
enable ACPI topology parsing.

Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
---
drivers/acpi/pptt.c | 1 +
drivers/base/cacheinfo.c | 20 +++++++++++++-------
include/linux/cacheinfo.h | 9 +++++++++
3 files changed, 23 insertions(+), 7 deletions(-)

diff --git a/drivers/acpi/pptt.c b/drivers/acpi/pptt.c
index 2c4b3ed862a8..4f5ab19c3a08 100644
--- a/drivers/acpi/pptt.c
+++ b/drivers/acpi/pptt.c
@@ -329,6 +329,7 @@ static void update_cache_properties(struct cacheinfo *this_leaf,
{
int valid_flags = 0;

+ this_leaf->fw_unique = cpu_node;
if (found_cache->flags & ACPI_PPTT_SIZE_PROPERTY_VALID) {
this_leaf->size = found_cache->size;
valid_flags++;
diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c
index 217aa90fb036..ee51e33cc37c 100644
--- a/drivers/base/cacheinfo.c
+++ b/drivers/base/cacheinfo.c
@@ -208,16 +208,16 @@ static int cache_setup_of_node(unsigned int cpu)

if (index != cache_leaves(cpu)) /* not all OF nodes populated */
return -ENOENT;
-
return 0;
}
+
#else
static inline int cache_setup_of_node(unsigned int cpu) { return 0; }
static inline bool cache_leaves_are_shared(struct cacheinfo *this_leaf,
struct cacheinfo *sib_leaf)
{
/*
- * For non-DT systems, assume unique level 1 cache, system-wide
+ * For non-DT/ACPI systems, assume unique level 1 caches, system-wide
* shared caches for all other levels. This will be used only if
* arch specific code has not populated shared_cpu_map
*/
@@ -225,6 +225,11 @@ static inline bool cache_leaves_are_shared(struct cacheinfo *this_leaf,
}
#endif

+int __weak cache_setup_acpi(unsigned int cpu)
+{
+ return -ENOTSUPP;
+}
+
static int cache_shared_cpu_map_setup(unsigned int cpu)
{
struct cpu_cacheinfo *this_cpu_ci = get_cpu_cacheinfo(cpu);
@@ -235,11 +240,11 @@ static int cache_shared_cpu_map_setup(unsigned int cpu)
if (this_cpu_ci->cpu_map_populated)
return 0;

- if (of_have_populated_dt())
+ if (!acpi_disabled)
+ ret = cache_setup_acpi(cpu);
+ else if (of_have_populated_dt())
ret = cache_setup_of_node(cpu);
- else if (!acpi_disabled)
- /* No cache property/hierarchy support yet in ACPI */
- ret = -ENOTSUPP;
+
if (ret)
return ret;

@@ -290,7 +295,8 @@ static void cache_shared_cpu_map_remove(unsigned int cpu)
cpumask_clear_cpu(cpu, &sib_leaf->shared_cpu_map);
cpumask_clear_cpu(sibling, &this_leaf->shared_cpu_map);
}
- of_node_put(this_leaf->fw_unique);
+ if (of_have_populated_dt())
+ of_node_put(this_leaf->fw_unique);
}
}

diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h
index 6f2e6c87b64c..65b0ae30016e 100644
--- a/include/linux/cacheinfo.h
+++ b/include/linux/cacheinfo.h
@@ -98,6 +98,15 @@ struct cpu_cacheinfo *get_cpu_cacheinfo(unsigned int cpu);
int init_cache_level(unsigned int cpu);
int populate_cache_leaves(unsigned int cpu);
void cache_of_set_props(struct cacheinfo *this_leaf, struct device_node *np);
+int cache_setup_acpi(unsigned int cpu);
+int acpi_find_last_cache_level(unsigned int cpu);
+#ifndef CONFIG_ACPI
+int acpi_find_last_cache_level(unsigned int cpu)
+{
+ /*ACPI kernels should be built with PPTT support*/
+ return 0;
+}
+#endif

const struct attribute_group *cache_get_priv_group(struct cacheinfo *this_leaf);

--
2.13.5