1 files changed, 37 insertions, 0 deletions

diff --git a/arch/arc/kernel/mcip.c b/arch/arc/kernel/mcip.c
index f61a52b01625..1119029ae7fc 100644
--- a/arch/arc/kernel/mcip.c
+++ b/arch/arc/kernel/mcip.c
@@ -22,10 +22,47 @@ static DEFINE_RAW_SPINLOCK(mcip_lock);
 
 static char smp_cpuinfo_buf[128];
 
+/*
+ * Set mask to halt GFRC if any online core in SMP cluster is halted.
+ * Only works for ARC HS v3.0+, on earlier versions has no effect.
+ */
+static void mcip_update_gfrc_halt_mask(int cpu)
+{
+        struct bcr_generic gfrc;
+        unsigned long flags;
+        u32 gfrc_halt_mask;
+
+        READ_BCR(ARC_REG_GFRC_BUILD, gfrc);
+
+        /*
+         * CMD_GFRC_SET_CORE and CMD_GFRC_READ_CORE commands were added in
+         * GFRC 0x3 version.
+         */
+        if (gfrc.ver < 0x3)
+                return;
+
+        raw_spin_lock_irqsave(&mcip_lock, flags);
+
+        __mcip_cmd(CMD_GFRC_READ_CORE, 0);
+        gfrc_halt_mask = read_aux_reg(ARC_REG_MCIP_READBACK);
+        gfrc_halt_mask |= BIT(cpu);
+        __mcip_cmd_data(CMD_GFRC_SET_CORE, 0, gfrc_halt_mask);
+
+        raw_spin_unlock_irqrestore(&mcip_lock, flags);
+}
+
 static void mcip_setup_per_cpu(int cpu)
 {
+        struct mcip_bcr mp;
+
+        READ_BCR(ARC_REG_MCIP_BCR, mp);
+
         smp_ipi_irq_setup(cpu, IPI_IRQ);
         smp_ipi_irq_setup(cpu, SOFTIRQ_IRQ);
+
+        /* Update GFRC halt mask as new CPU came online */
+        if (mp.gfrc)
+                mcip_update_gfrc_halt_mask(cpu);
 }
 
 static void mcip_ipi_send(int cpu)