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authorDave Airlie <airlied@redhat.com>2018-01-18 09:32:15 +1000
committerDave Airlie <airlied@redhat.com>2018-01-18 09:32:15 +1000
commit4a6cc7a44e98a0460bd094b68c75f0705fdc450a (patch)
treeb8c86a1e0342b1166ab52c4d79e404eede57abec /drivers/base
parent8563188e37b000979ab66521f4337df9a3453223 (diff)
parenta8750ddca918032d6349adbf9a4b6555e7db20da (diff)
BackMerge tag 'v4.15-rc8' into drm-next
Linux 4.15-rc8 Daniel requested this for so the intel CI won't fall over on drm-next so often.
Diffstat (limited to 'drivers/base')
-rw-r--r--drivers/base/Kconfig3
-rw-r--r--drivers/base/cacheinfo.c13
-rw-r--r--drivers/base/cpu.c48
3 files changed, 64 insertions, 0 deletions
diff --git a/drivers/base/Kconfig b/drivers/base/Kconfig
index 1e71d70cdf3f..49fd50fccd48 100644
--- a/drivers/base/Kconfig
+++ b/drivers/base/Kconfig
@@ -236,6 +236,9 @@ config GENERIC_CPU_DEVICES
config GENERIC_CPU_AUTOPROBE
bool
+config GENERIC_CPU_VULNERABILITIES
+ bool
+
config SOC_BUS
bool
select GLOB
diff --git a/drivers/base/cacheinfo.c b/drivers/base/cacheinfo.c
index eb3af2739537..07532d83be0b 100644
--- a/drivers/base/cacheinfo.c
+++ b/drivers/base/cacheinfo.c
@@ -186,6 +186,11 @@ static void cache_associativity(struct cacheinfo *this_leaf)
this_leaf->ways_of_associativity = (size / nr_sets) / line_size;
}
+static bool cache_node_is_unified(struct cacheinfo *this_leaf)
+{
+ return of_property_read_bool(this_leaf->of_node, "cache-unified");
+}
+
static void cache_of_override_properties(unsigned int cpu)
{
int index;
@@ -194,6 +199,14 @@ static void cache_of_override_properties(unsigned int cpu)
for (index = 0; index < cache_leaves(cpu); index++) {
this_leaf = this_cpu_ci->info_list + index;
+ /*
+ * init_cache_level must setup the cache level correctly
+ * overriding the architecturally specified levels, so
+ * if type is NONE at this stage, it should be unified
+ */
+ if (this_leaf->type == CACHE_TYPE_NOCACHE &&
+ cache_node_is_unified(this_leaf))
+ this_leaf->type = CACHE_TYPE_UNIFIED;
cache_size(this_leaf);
cache_get_line_size(this_leaf);
cache_nr_sets(this_leaf);
diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index 58a9b608d821..d99038487a0d 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -511,10 +511,58 @@ static void __init cpu_dev_register_generic(void)
#endif
}
+#ifdef CONFIG_GENERIC_CPU_VULNERABILITIES
+
+ssize_t __weak cpu_show_meltdown(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "Not affected\n");
+}
+
+ssize_t __weak cpu_show_spectre_v1(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "Not affected\n");
+}
+
+ssize_t __weak cpu_show_spectre_v2(struct device *dev,
+ struct device_attribute *attr, char *buf)
+{
+ return sprintf(buf, "Not affected\n");
+}
+
+static DEVICE_ATTR(meltdown, 0444, cpu_show_meltdown, NULL);
+static DEVICE_ATTR(spectre_v1, 0444, cpu_show_spectre_v1, NULL);
+static DEVICE_ATTR(spectre_v2, 0444, cpu_show_spectre_v2, NULL);
+
+static struct attribute *cpu_root_vulnerabilities_attrs[] = {
+ &dev_attr_meltdown.attr,
+ &dev_attr_spectre_v1.attr,
+ &dev_attr_spectre_v2.attr,
+ NULL
+};
+
+static const struct attribute_group cpu_root_vulnerabilities_group = {
+ .name = "vulnerabilities",
+ .attrs = cpu_root_vulnerabilities_attrs,
+};
+
+static void __init cpu_register_vulnerabilities(void)
+{
+ if (sysfs_create_group(&cpu_subsys.dev_root->kobj,
+ &cpu_root_vulnerabilities_group))
+ pr_err("Unable to register CPU vulnerabilities\n");
+}
+
+#else
+static inline void cpu_register_vulnerabilities(void) { }
+#endif
+
void __init cpu_dev_init(void)
{
if (subsys_system_register(&cpu_subsys, cpu_root_attr_groups))
panic("Failed to register CPU subsystem");
cpu_dev_register_generic();
+ cpu_register_vulnerabilities();
}

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