From 78a54c4d8e5a7915a4ec2ba0eb461fae50590683 Mon Sep 17 00:00:00 2001 From: Paul Burton Date: Tue, 22 Sep 2015 11:12:18 -0700 Subject: [PATCH] MIPS: CM, CPC: Ensure core-other GCRs reflect the correct core Ensure the update to which core the core-other GCR regions reflect has taken place before any core-other GCRs are accessed by placing a memory barrier (sync instruction) between the write to the core-other registers and any such GCR accesses. Signed-off-by: Paul Burton Cc: linux-mips@linux-mips.org Cc: Bjorn Helgaas Cc: linux-kernel@vger.kernel.org Cc: Markos Chandras Patchwork: https://patchwork.linux-mips.org/patch/11209/ Signed-off-by: Ralf Baechle --- arch/mips/kernel/mips-cm.c | 6 ++++++ arch/mips/kernel/mips-cpc.c | 6 ++++++ 2 files changed, 12 insertions(+) diff --git a/arch/mips/kernel/mips-cm.c b/arch/mips/kernel/mips-cm.c index 01908dbdf677..1448c1f43d4e 100644 --- a/arch/mips/kernel/mips-cm.c +++ b/arch/mips/kernel/mips-cm.c @@ -278,6 +278,12 @@ void mips_cm_lock_other(unsigned int core, unsigned int vp) } write_gcr_cl_other(val); + + /* + * Ensure the core-other region reflects the appropriate core & + * VP before any accesses to it occur. + */ + mb(); } void mips_cm_unlock_other(void) diff --git a/arch/mips/kernel/mips-cpc.c b/arch/mips/kernel/mips-cpc.c index 8af4d627b68b..566b8d2c092c 100644 --- a/arch/mips/kernel/mips-cpc.c +++ b/arch/mips/kernel/mips-cpc.c @@ -76,6 +76,12 @@ void mips_cpc_lock_other(unsigned int core) spin_lock_irqsave(&per_cpu(cpc_core_lock, curr_core), per_cpu(cpc_core_lock_flags, curr_core)); write_cpc_cl_other(core << CPC_Cx_OTHER_CORENUM_SHF); + + /* + * Ensure the core-other region reflects the appropriate core & + * VP before any accesses to it occur. + */ + mb(); } void mips_cpc_unlock_other(void)