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Subject[PATCH 3/8] cpu: advertise CPU features over udev in a generic way
Date
This patch implements a generic modalias 'cpu:type:...:feature:...'
which enables CPU feature flag based module loading in a generic way.
All the arch needs to do is enable CONFIG_ARCH_HAS_CPU_AUTOPROBE and
implement arch_print_cpu_modalias(). The modules need to declare the
CPU feature they depend on with MODULE_DEVICE_TABLE(cpu, ...)

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
---
include/linux/mod_devicetable.h | 15 +++++++++++++++
scripts/mod/devicetable-offsets.c | 3 +++
scripts/mod/file2alias.c | 10 ++++++++++
3 files changed, 28 insertions(+)

diff --git a/include/linux/mod_devicetable.h b/include/linux/mod_devicetable.h
index 45e921401b06..3aad3c0f765c 100644
--- a/include/linux/mod_devicetable.h
+++ b/include/linux/mod_devicetable.h
@@ -564,6 +564,21 @@ struct x86_cpu_id {
#define X86_MODEL_ANY 0
#define X86_FEATURE_ANY 0 /* Same as FPU, you can't test for that */

+/*
+ * Generic table type for matching CPU features.
+ * @feature: the bit number of the feature (0 - 65535)
+ *
+ * How the bit numbers map to actual CPU features is entirely up to the arch,
+ * although using the same ID space as hwcaps seems obvious.
+ */
+
+struct cpu_feature {
+ __u16 feature;
+};
+
+/* hwcap const are bit masks, so take the log when using them as feature IDs */
+#define CPU_FEATURE_HWCAP(x) ilog2(x)
+
#define IPACK_ANY_FORMAT 0xff
#define IPACK_ANY_ID (~0)
struct ipack_device_id {
diff --git a/scripts/mod/devicetable-offsets.c b/scripts/mod/devicetable-offsets.c
index bb5d115ca671..f282516acc7b 100644
--- a/scripts/mod/devicetable-offsets.c
+++ b/scripts/mod/devicetable-offsets.c
@@ -174,6 +174,9 @@ int main(void)
DEVID_FIELD(x86_cpu_id, model);
DEVID_FIELD(x86_cpu_id, vendor);

+ DEVID(cpu_feature);
+ DEVID_FIELD(cpu_feature, feature);
+
DEVID(mei_cl_device_id);
DEVID_FIELD(mei_cl_device_id, name);

diff --git a/scripts/mod/file2alias.c b/scripts/mod/file2alias.c
index 23708636b05c..8a69005228d8 100644
--- a/scripts/mod/file2alias.c
+++ b/scripts/mod/file2alias.c
@@ -1135,6 +1135,16 @@ static int do_x86cpu_entry(const char *filename, void *symval,
}
ADD_TO_DEVTABLE("x86cpu", x86_cpu_id, do_x86cpu_entry);

+/* LOOKS like cpu:type:*:feature:*FEAT* */
+static int do_cpu_entry(const char *filename, void *symval, char *alias)
+{
+ DEF_FIELD(symval, cpu_feature, feature);
+
+ sprintf(alias, "cpu:type:*:feature:*%04X*", feature);
+ return 1;
+}
+ADD_TO_DEVTABLE("cpu", cpu_feature, do_cpu_entry);
+
/* Looks like: mei:S */
static int do_mei_entry(const char *filename, void *symval,
char *alias)
--
1.8.3.2


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