MIPS: Add function get_ebase_cpunum
This returns the CPUNum from the low order Ebase bits.
Signed-off-by: David Daney <david.daney@cavium.com>
Signed-off-by: Andreas Herrmann <andreas.herrmann@caviumnetworks.com>
Cc: linux-mips@linux-mips.org
Cc: James Hogan <james.hogan@imgtec.com>
Cc: kvm@vger.kernel.org
Patchwork: https://patchwork.linux-mips.org/patch/7012/
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
diff --git a/arch/mips/include/asm/mipsregs.h b/arch/mips/include/asm/mipsregs.h
index fb2d174..98e9754 100644
--- a/arch/mips/include/asm/mipsregs.h
+++ b/arch/mips/include/asm/mipsregs.h
@@ -1792,6 +1792,15 @@
__BUILD_SET_C0(brcm_config)
__BUILD_SET_C0(brcm_mode)
+/*
+ * Return low 10 bits of ebase.
+ * Note that under KVM (MIPSVZ) this returns vcpu id.
+ */
+static inline unsigned int get_ebase_cpunum(void)
+{
+ return read_c0_ebase() & 0x3ff;
+}
+
#endif /* !__ASSEMBLY__ */
#endif /* _ASM_MIPSREGS_H */
diff --git a/arch/mips/kernel/cpu-probe.c b/arch/mips/kernel/cpu-probe.c
index b1b580d..d74f957 100644
--- a/arch/mips/kernel/cpu-probe.c
+++ b/arch/mips/kernel/cpu-probe.c
@@ -423,7 +423,7 @@
#ifndef CONFIG_MIPS_CPS
if (cpu_has_mips_r2) {
- c->core = read_c0_ebase() & 0x3ff;
+ c->core = get_ebase_cpunum();
if (cpu_has_mipsmt)
c->core >>= fls(core_nvpes()) - 1;
}