ARC: mcip: update MCIP debug mask when the new cpu came online

[ Upstream commit f3205de98db2fc8083796dd5ad81b191e436fab8 ]

As of today we use hardcoded MCIP debug mask, so if we launch
kernel via debugger and kick fever cores than HW has all cpus
hang at the momemt of setup MCIP debug mask.

So update MCIP debug mask when the new cpu came online, instead of
use hardcoded MCIP debug mask.

Signed-off-by: Eugeniy Paltsev <Eugeniy.Paltsev@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/arc/kernel/mcip.c b/arch/arc/kernel/mcip.c
index 1119029ae7fcfeda828da937ef6d01ee58dd32db..5fe84e481654ebe76a483bf81c2a11ffe870322d 100644 (file)
--- a/arch/arc/kernel/mcip.c
+++ b/arch/arc/kernel/mcip.c
@@ -51,6 +51,34 @@ static void mcip_update_gfrc_halt_mask(int cpu)
        raw_spin_unlock_irqrestore(&mcip_lock, flags);
 }
 
+static void mcip_update_debug_halt_mask(int cpu)
+{
+       u32 mcip_mask = 0;
+       unsigned long flags;
+
+       raw_spin_lock_irqsave(&mcip_lock, flags);
+
+       /*
+        * mcip_mask is same for CMD_DEBUG_SET_SELECT and CMD_DEBUG_SET_MASK
+        * commands. So read it once instead of reading both CMD_DEBUG_READ_MASK
+        * and CMD_DEBUG_READ_SELECT.
+        */
+       __mcip_cmd(CMD_DEBUG_READ_SELECT, 0);
+       mcip_mask = read_aux_reg(ARC_REG_MCIP_READBACK);
+
+       mcip_mask |= BIT(cpu);
+
+       __mcip_cmd_data(CMD_DEBUG_SET_SELECT, 0, mcip_mask);
+       /*
+        * Parameter specified halt cause:
+        * STATUS32[H]/actionpoint/breakpoint/self-halt
+        * We choose all of them (0xF).
+        */
+       __mcip_cmd_data(CMD_DEBUG_SET_MASK, 0xF, mcip_mask);
+
+       raw_spin_unlock_irqrestore(&mcip_lock, flags);
+}
+
 static void mcip_setup_per_cpu(int cpu)
 {
        struct mcip_bcr mp;
@@ -63,6 +91,10 @@ static void mcip_setup_per_cpu(int cpu)
        /* Update GFRC halt mask as new CPU came online */
        if (mp.gfrc)
                mcip_update_gfrc_halt_mask(cpu);
+
+       /* Update MCIP debug mask as new CPU came online */
+       if (mp.dbg)
+               mcip_update_debug_halt_mask(cpu);
 }
 
 static void mcip_ipi_send(int cpu)
@@ -138,11 +170,6 @@ static void mcip_probe_n_setup(void)
                IS_AVAIL1(mp.gfrc, "GFRC"));
 
        cpuinfo_arc700[0].extn.gfrc = mp.gfrc;
-
-       if (mp.dbg) {
-               __mcip_cmd_data(CMD_DEBUG_SET_SELECT, 0, 0xf);
-               __mcip_cmd_data(CMD_DEBUG_SET_MASK, 0xf, 0xf);
-       }
 }
 
 struct plat_smp_ops plat_smp_ops = {

diff --git a/include/soc/arc/mcip.h b/include/soc/arc/mcip.h
index 1138da57baafc533758673041457b822ed917efe..a91f25151a5b96ce43d61e2f58841aefa4190baa 100644 (file)
--- a/include/soc/arc/mcip.h
+++ b/include/soc/arc/mcip.h
@@ -37,7 +37,9 @@ struct mcip_cmd {
 #define CMD_SEMA_RELEASE               0x12
 
 #define CMD_DEBUG_SET_MASK             0x34
+#define CMD_DEBUG_READ_MASK            0x35
 #define CMD_DEBUG_SET_SELECT           0x36
+#define CMD_DEBUG_READ_SELECT          0x37
 
 #define CMD_GFRC_READ_LO               0x42
 #define CMD_GFRC_READ_HI               0x43