arm64: add HWCAP_EVTSTRM and associated hwcap refactoring

Take the hwcaps changes from 46efe547aca8498d51b64460c02366ae4032ca32 to
facilitate cherry-picking later hwcaps changes, while skipping the timer
changes that actually enable event streams for now.  The timer changes
depend on some non-trivial changes made after 3.10, and can safely be
dropped: the kernel will just continue reporting that HWCAP_EVTSTRM is
not available.

Bug: 17431179

Change-Id: I41548846f8cd7ae8147a2b115cc0f84708e29552
Signed-off-by: Greg Hackmann <ghackmann@google.com>

diff --git a/arch/arm64/include/asm/hwcap.h b/arch/arm64/include/asm/hwcap.h
index 6d4482fa35bcbc183bf64d9239a4a5a87bb86705..3a48433dfb570b5d61805de3acb6a36693a5683a 100644 (file)
--- a/arch/arm64/include/asm/hwcap.h
+++ b/arch/arm64/include/asm/hwcap.h
@@ -30,6 +30,7 @@
 #define COMPAT_HWCAP_IDIVA     (1 << 17)
 #define COMPAT_HWCAP_IDIVT     (1 << 18)
 #define COMPAT_HWCAP_IDIV      (COMPAT_HWCAP_IDIVA|COMPAT_HWCAP_IDIVT)
+#define COMPAT_HWCAP_EVTSTRM   (1 << 21)
 
 #ifndef __ASSEMBLY__
 /*
@@ -37,11 +38,11 @@
  * instruction set this cpu supports.
  */
 #define ELF_HWCAP              (elf_hwcap)
-#define COMPAT_ELF_HWCAP       (COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\
-                                COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\
-                                COMPAT_HWCAP_TLS|COMPAT_HWCAP_VFP|\
-                                COMPAT_HWCAP_VFPv3|COMPAT_HWCAP_VFPv4|\
-                                COMPAT_HWCAP_NEON|COMPAT_HWCAP_IDIV)
+
+#ifdef CONFIG_COMPAT
+#define COMPAT_ELF_HWCAP       (compat_elf_hwcap)
+extern unsigned int compat_elf_hwcap;
+#endif
 
 extern unsigned int elf_hwcap;
 #endif

diff --git a/arch/arm64/include/uapi/asm/hwcap.h b/arch/arm64/include/uapi/asm/hwcap.h
index eea497578b877194473f457d8ef827aba18e0943..9b12476e9c8567545c493704075f56c8643bbae6 100644 (file)
--- a/arch/arm64/include/uapi/asm/hwcap.h
+++ b/arch/arm64/include/uapi/asm/hwcap.h
@@ -21,6 +21,7 @@
  */
 #define HWCAP_FP               (1 << 0)
 #define HWCAP_ASIMD            (1 << 1)
+#define HWCAP_EVTSTRM          (1 << 2)
 
 
 #endif /* _UAPI__ASM_HWCAP_H */

diff --git a/arch/arm64/kernel/setup.c b/arch/arm64/kernel/setup.c
index add6ea616843139ff81a65f26c344ed9e69fd66d..57cb0063d74cd3f2be37ab7ef4ce5f73a514bcf9 100644 (file)
--- a/arch/arm64/kernel/setup.c
+++ b/arch/arm64/kernel/setup.c
@@ -60,6 +60,16 @@ EXPORT_SYMBOL(processor_id);
 unsigned int elf_hwcap __read_mostly;
 EXPORT_SYMBOL_GPL(elf_hwcap);
 
+#ifdef CONFIG_COMPAT
+#define COMPAT_ELF_HWCAP_DEFAULT       \
+                               (COMPAT_HWCAP_HALF|COMPAT_HWCAP_THUMB|\
+                                COMPAT_HWCAP_FAST_MULT|COMPAT_HWCAP_EDSP|\
+                                COMPAT_HWCAP_TLS|COMPAT_HWCAP_VFP|\
+                                COMPAT_HWCAP_VFPv3|COMPAT_HWCAP_VFPv4|\
+                                COMPAT_HWCAP_NEON|COMPAT_HWCAP_IDIV)
+unsigned int compat_elf_hwcap __read_mostly = COMPAT_ELF_HWCAP_DEFAULT;
+#endif
+
 static const char *cpu_name;
 static const char *machine_name;
 phys_addr_t __fdt_pointer __initdata;
@@ -309,6 +319,7 @@ subsys_initcall(topology_init);
 static const char *hwcap_str[] = {
        "fp",
        "asimd",
+       "evtstrm",
        NULL
 };