drivers: base cacheinfo: Add support for ACPI based firmware tables

BugLink: https://bugs.launchpad.net/bugs/1770231
Call ACPI cache parsing routines from base cacheinfo code if ACPI
is enabled. Also stub out cache_setup_acpi and acpi_find_last_cache_level
so that individual architectures can enable ACPI topology parsing.

Tested-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Tested-by: Vijaya Kumar K <vkilari@codeaurora.org>
Tested-by: Xiongfeng Wang <wangxiongfeng2@huawei.com>
Tested-by: Tomasz Nowicki <Tomasz.Nowicki@cavium.com>
Acked-by: Sudeep Holla <sudeep.holla@arm.com>
Acked-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Jeremy Linton <jeremy.linton@arm.com>
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
(cherry picked from commit 582b468bdc6d9c287a432a63225cf7922e985e15 linux-next)
Signed-off-by: dann frazier <dann.frazier@canonical.com>
Acked-by: Stefan Bader <stefan.bader@canonical.com>
Acked-by: Kleber Sacilotto de Souza <kleber.souza@canonical.com>
Signed-off-by: Khalid Elmously <khalid.elmously@canonical.com>

diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c
index 187099ab318b59460409ba01f257f0a23666fb56..8a2ae25b65d5986f7384afb0b26d585484d5d36a 100644 (file)
--- a/drivers/base/cacheinfo.c
+++ b/drivers/base/cacheinfo.c
@@ -217,7 +217,7 @@ 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);
@@ -238,8 +243,8 @@ static int cache_shared_cpu_map_setup(unsigned int cpu)
        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;
+               ret = cache_setup_acpi(cpu);
+
        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_token);
+               if (of_have_populated_dt())
+                       of_node_put(this_leaf->fw_token);
        }
 }
 

diff --git a/include/linux/cacheinfo.h b/include/linux/cacheinfo.h
index 0c6f658054d2a5bb2f575757ed2ba39035c95d91..89397e30e2695ab48f8092eb8d8d965fb7e284d9 100644 (file)
--- a/include/linux/cacheinfo.h
+++ b/include/linux/cacheinfo.h
@@ -97,6 +97,23 @@ int func(unsigned int cpu)                                   \
 struct cpu_cacheinfo *get_cpu_cacheinfo(unsigned int cpu);
 int init_cache_level(unsigned int cpu);
 int populate_cache_leaves(unsigned int cpu);
+int cache_setup_acpi(unsigned int cpu);
+#ifndef CONFIG_ACPI
+/*
+ * acpi_find_last_cache_level is only called on ACPI enabled
+ * platforms using the PPTT for topology. This means that if
+ * the platform supports other firmware configuration methods
+ * we need to stub out the call when ACPI is disabled.
+ * ACPI enabled platforms not using PPTT won't be making calls
+ * to this function so we need not worry about them.
+ */
+static inline int acpi_find_last_cache_level(unsigned int cpu)
+{
+       return 0;
+}
+#else
+int acpi_find_last_cache_level(unsigned int cpu);
+#endif
 
 const struct attribute_group *cache_get_priv_group(struct cacheinfo *this_leaf);