From: Alastair D'Silva <alastair@xxxxxxxxxxx>
This patch provides the necessary infrastructure to allow drivers
to be automatically loaded via UDEV. It implements the minimum
required to be able to use module_cpu_feature_match to trigger
the GENERIC_CPU_AUTOPROBE mechanisms.
The features exposed are a mirror of the cpu_user_features
(converted to an offset from a mask). This decision was made to
ensure that the behavior between features for module loading and
userspace are consistent.
Signed-off-by: Alastair D'Silva <alastair@xxxxxxxxxxx>
---
arch/powerpc/Kconfig | 1 +
arch/powerpc/include/asm/cpufeature.h | 70 +++++++++++++++++++++++++++++++++++
2 files changed, 71 insertions(+)
create mode 100644 arch/powerpc/include/asm/cpufeature.h
diff --git a/arch/powerpc/Kconfig b/arch/powerpc/Kconfig
index 0a9d439..a6e49db 100644
--- a/arch/powerpc/Kconfig
+++ b/arch/powerpc/Kconfig
@@ -164,6 +164,7 @@ config PPC
select ARCH_HAS_UBSAN_SANITIZE_ALL
select ARCH_SUPPORTS_DEFERRED_STRUCT_PAGE_INIT
select HAVE_LIVEPATCH if HAVE_DYNAMIC_FTRACE_WITH_REGS
+ select GENERIC_CPU_AUTOPROBE
config GENERIC_CSUM
def_bool CPU_LITTLE_ENDIAN
diff --git a/arch/powerpc/include/asm/cpufeature.h b/arch/powerpc/include/asm/cpufeature.h
new file mode 100644
index 0000000..df31627
--- /dev/null
+++ b/arch/powerpc/include/asm/cpufeature.h
@@ -0,0 +1,70 @@
+/* CPU feature definitions for module loading, used by
+ * module_cpu_feature_match(), see asm/cputable.h for powerpc CPU features
+ *
+ * Copyright 2016 Alastair D'Silva, IBM Corporation.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ */
+
+#ifndef __ASM_CPUFEATURE_H
+#define __ASM_POWERPC_CPUFEATURE_H
+
+#include <asm/cputable.h>
+
+/* Keep these in step with powerpc/include/asm/cputable.h */
+#define MAX_CPU_FEATURES (2 * 32)
+
+#define PPC_MODULE_FEATURE_32 (ilog2(PPC_FEATURE_32))
+#define PPC_MODULE_FEATURE_64 (ilog2(PPC_FEATURE_64))
+#define PPC_MODULE_FEATURE_601_INSTR (ilog2(PPC_FEATURE_601_INSTR))
+#define PPC_MODULE_FEATURE_HAS_ALTIVEC (ilog2(PPC_FEATURE_HAS_ALTIVEC))
+#define PPC_MODULE_FEATURE_HAS_FPU (ilog2(PPC_FEATURE_HAS_FPU))
+#define PPC_MODULE_FEATURE_HAS_MMU (ilog2(PPC_FEATURE_HAS_MMU))
+#define PPC_MODULE_FEATURE_HAS_4xxMAC (ilog2(PPC_FEATURE_HAS_4xxMAC))
+#define PPC_MODULE_FEATURE_UNIFIED_CACHE ilog2(PPC_FEATURE_UNIFIED_CACHE))
+#define PPC_MODULE_FEATURE_HAS_SPE (ilog2(PPC_FEATURE_HAS_SPE))
+#define PPC_MODULE_FEATURE_HAS_EFP_SINGLE (ilog2(PPC_FEATURE_HAS_EFP_SINGLE))
+#define PPC_MODULE_FEATURE_HAS_EFP_DOUBLE (ilog2(PPC_FEATURE_HAS_EFP_DOUBLE))
+#define PPC_MODULE_FEATURE_NO_TB (ilog2(PPC_FEATURE_NO_TB))
+#define PPC_MODULE_FEATURE_POWER4 (ilog2(PPC_FEATURE_POWER4))
+#define PPC_MODULE_FEATURE_POWER5 (ilog2(PPC_FEATURE_POWER5))
+#define PPC_MODULE_FEATURE_POWER5_PLUS (ilog2(PPC_FEATURE_POWER5_PLUS))
+#define PPC_MODULE_FEATURE_CELL (ilog2(PPC_FEATURE_CELL))
+#define PPC_MODULE_FEATURE_BOOKE (ilog2(PPC_FEATURE_BOOKE))
+#define PPC_MODULE_FEATURE_SMT (ilog2(PPC_FEATURE_SMT))
+#define PPC_MODULE_FEATURE_ICACHE_SNOOP (ilog2(PPC_FEATURE_ICACHE_SNOOP))
+#define PPC_MODULE_FEATURE_ARCH_2_05 (ilog2(PPC_FEATURE_ARCH_2_05))
+#define PPC_MODULE_FEATURE_PA6T (ilog2(PPC_FEATURE_PA6T))
+#define PPC_MODULE_FEATURE_HAS_DFP (ilog2(PPC_FEATURE_HAS_DFP))
+#define PPC_MODULE_FEATURE_POWER6_EXT (ilog2(PPC_FEATURE_POWER6_EXT))
+#define PPC_MODULE_FEATURE_ARCH_2_06 (ilog2(PPC_FEATURE_ARCH_2_06))
+#define PPC_MODULE_FEATURE_HAS_VSX (ilog2(PPC_FEATURE_HAS_VSX))
+#define PPC_MODULE_FEATURE_PSERIES_PERFMON_COMPAT (ilog2(PPC_FEATURE_PSERIES_PERFMON_COMPAT))
+#define PPC_MODULE_FEATURE_TRUE_LE (ilog2(PPC_FEATURE_TRUE_LE))
+#define PPC_MODULE_FEATURE_PPC_LE (ilog2(PPC_FEATURE_PPC_LE))
+
+#define PPC_MODULE_FEATURE_ARCH_2_07 (32 + ilog2(PPC_FEATURE2_ARCH_2_07))
+#define PPC_MODULE_FEATURE_HTM (32 + ilog2(PPC_FEATURE2_HTM))
+#define PPC_MODULE_FEATURE_DSCR (32 + ilog2(PPC_FEATURE2_DSCR))
+#define PPC_MODULE_FEATURE_EBB (32 + ilog2(PPC_FEATURE2_EBB))
+#define PPC_MODULE_FEATURE_ISEL (32 + ilog2(PPC_FEATURE2_ISEL))
+#define PPC_MODULE_FEATURE_TAR (32 + ilog2(PPC_FEATURE2_TAR))
+#define PPC_MODULE_FEATURE_VEC_CRYPTO (32 + ilog2(PPC_FEATURE2_VEC_CRYPTO))
+#define PPC_MODULE_FEATURE_HTM_NOSC (32 + ilog2(PPC_FEATURE2_HTM_NOSC))
+#define PPC_MODULE_FEATURE_ARCH_3_00 (32 + ilog2(PPC_FEATURE2_ARCH_3_00))
+#define PPC_MODULE_FEATURE_HAS_IEEE128 (32 + ilog2(PPC_FEATURE2_HAS_IEEE128))
+
+#define cpu_feature(x) (x)
+
+static inline bool cpu_have_feature(unsigned int num)
+{
+ if (num < 32)
+ return !!(cur_cpu_spec->cpu_user_features & 1UL << num);
+ else
+ return !!(cur_cpu_spec->cpu_user_features2 & 1UL << (num - 32));
+}
+
+#endif /* __ASM_POWERPC_CPUFEATURE_H */
--
2.7.4
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