MIPS: CPC: provide locking functions

This patch provides functions to lock & unlock access to the
"core-other" register region of the CPC. Without performing appropriate
locking it is possible for code using this region to be preempted or to
race with code on another VPE within the same core, with one changing
the core which the "core-other" region is acting upon at an inopportune
time for the other.

Signed-off-by: Paul Burton <paul.burton@imgtec.com>

1 files changed, 27 insertions, 0 deletions

diff --git a/arch/mips/include/asm/mips-cpc.h b/arch/mips/include/asm/mips-cpc.h
index c5bb609c4b97..e139a534e0fd 100644
--- a/arch/mips/include/asm/mips-cpc.h
+++ b/arch/mips/include/asm/mips-cpc.h
@@ -152,4 +152,31 @@ BUILD_CPC_Cx_RW(other,		0x10)
 #define CPC_Cx_OTHER_CORENUM_SHF		16
 #define CPC_Cx_OTHER_CORENUM_MSK		(_ULCAST_(0xff) << 16)
 
+#ifdef CONFIG_MIPS_CPC
+
+/**
+ * mips_cpc_lock_other - lock access to another core
+ * core: the other core to be accessed
+ *
+ * Call before operating upon a core via the 'other' register region in
+ * order to prevent the region being moved during access. Must be followed
+ * by a call to mips_cpc_unlock_other.
+ */
+extern void mips_cpc_lock_other(unsigned int core);
+
+/**
+ * mips_cpc_unlock_other - unlock access to another core
+ *
+ * Call after operating upon another core via the 'other' register region.
+ * Must be called after mips_cpc_lock_other.
+ */
+extern void mips_cpc_unlock_other(void);
+
+#else /* !CONFIG_MIPS_CPC */
+
+static inline void mips_cpc_lock_other(unsigned int core) { }
+static inline void mips_cpc_unlock_other(void) { }
+
+#endif /* !CONFIG_MIPS_CPC */
+
 #endif /* __MIPS_ASM_MIPS_CPC_H__ */