10 files changed, 107 insertions, 23 deletions

diff --git a/arch/mips/kernel/asm-offsets.c b/arch/mips/kernel/asm-offsets.c
index 40fd4051bb3d..d1b11f66f748 100644
--- a/arch/mips/kernel/asm-offsets.c
+++ b/arch/mips/kernel/asm-offsets.c
@@ -23,6 +23,7 @@
 
 #include <linux/kvm_host.h>
 
+void output_ptreg_defines(void);
 void output_ptreg_defines(void)
 {
 	COMMENT("MIPS pt_regs offsets.");
@@ -75,6 +76,7 @@ void output_ptreg_defines(void)
 	BLANK();
 }
 
+void output_task_defines(void);
 void output_task_defines(void)
 {
 	COMMENT("MIPS task_struct offsets.");
@@ -89,6 +91,7 @@ void output_task_defines(void)
 	BLANK();
 }
 
+void output_thread_info_defines(void);
 void output_thread_info_defines(void)
 {
 	COMMENT("MIPS thread_info offsets.");
@@ -105,6 +108,7 @@ void output_thread_info_defines(void)
 	BLANK();
 }
 
+void output_thread_defines(void);
 void output_thread_defines(void)
 {
 	COMMENT("MIPS specific thread_struct offsets.");
@@ -133,6 +137,7 @@ void output_thread_defines(void)
 }
 
 #ifdef CONFIG_MIPS_FP_SUPPORT
+void output_thread_fpu_defines(void);
 void output_thread_fpu_defines(void)
 {
 	OFFSET(THREAD_FPU, task_struct, thread.fpu);
@@ -176,6 +181,7 @@ void output_thread_fpu_defines(void)
 }
 #endif
 
+void output_mm_defines(void);
 void output_mm_defines(void)
 {
 	COMMENT("Size of struct page");
@@ -210,6 +216,7 @@ void output_mm_defines(void)
 }
 
 #ifdef CONFIG_32BIT
+void output_sc_defines(void);
 void output_sc_defines(void)
 {
 	COMMENT("Linux sigcontext offsets.");
@@ -232,6 +239,7 @@ void output_sc_defines(void)
 #endif
 
 #ifdef CONFIG_64BIT
+void output_sc_defines(void);
 void output_sc_defines(void)
 {
 	COMMENT("Linux sigcontext offsets.");
@@ -245,6 +253,7 @@ void output_sc_defines(void)
 }
 #endif
 
+void output_signal_defined(void);
 void output_signal_defined(void)
 {
 	COMMENT("Linux signal numbers.");
@@ -284,6 +293,7 @@ void output_signal_defined(void)
 }
 
 #ifdef CONFIG_CPU_CAVIUM_OCTEON
+void output_octeon_cop2_state_defines(void);
 void output_octeon_cop2_state_defines(void)
 {
 	COMMENT("Octeon specific octeon_cop2_state offsets.");
@@ -315,6 +325,7 @@ void output_octeon_cop2_state_defines(void)
 #endif
 
 #ifdef CONFIG_HIBERNATION
+void output_pbe_defines(void);
 void output_pbe_defines(void)
 {
 	COMMENT(" Linux struct pbe offsets. ");
@@ -327,6 +338,7 @@ void output_pbe_defines(void)
 #endif
 
 #ifdef CONFIG_CPU_PM
+void output_pm_defines(void);
 void output_pm_defines(void)
 {
 	COMMENT(" PM offsets. ");
@@ -341,6 +353,7 @@ void output_pm_defines(void)
 #endif
 
 #ifdef CONFIG_MIPS_FP_SUPPORT
+void output_kvm_defines(void);
 void output_kvm_defines(void)
 {
 	COMMENT(" KVM/MIPS Specific offsets. ");
@@ -385,6 +398,7 @@ void output_kvm_defines(void)
 #endif
 
 #ifdef CONFIG_MIPS_CPS
+void output_cps_defines(void);
 void output_cps_defines(void)
 {
 	COMMENT(" MIPS CPS offsets. ");
diff --git a/arch/mips/kernel/setup.c b/arch/mips/kernel/setup.c
index c0e65135481b..cb871eb784a7 100644
--- a/arch/mips/kernel/setup.c
+++ b/arch/mips/kernel/setup.c
@@ -11,6 +11,8 @@
  * Copyright (C) 2000, 2001, 2002, 2007	 Maciej W. Rozycki
  */
 #include <linux/init.h>
+#include <linux/cpu.h>
+#include <linux/delay.h>
 #include <linux/ioport.h>
 #include <linux/export.h>
 #include <linux/screen_info.h>
@@ -841,3 +843,14 @@ static int __init setnocoherentio(char *str)
 }
 early_param("nocoherentio", setnocoherentio);
 #endif
+
+void __init arch_cpu_finalize_init(void)
+{
+	unsigned int cpu = smp_processor_id();
+
+	cpu_data[cpu].udelay_val = loops_per_jiffy;
+	check_bugs32();
+
+	if (IS_ENABLED(CONFIG_CPU_R4X00_BUGS64))
+		check_bugs64();
+}
diff --git a/arch/mips/kernel/smp-bmips.c b/arch/mips/kernel/smp-bmips.c
index 15466d4cf4a0..c074ecce3fbf 100644
--- a/arch/mips/kernel/smp-bmips.c
+++ b/arch/mips/kernel/smp-bmips.c
@@ -392,6 +392,7 @@ static void bmips_cpu_die(unsigned int cpu)
 void __ref play_dead(void)
 {
 	idle_task_exit();
+	cpuhp_ap_report_dead();
 
 	/* flush data cache */
 	_dma_cache_wback_inv(0, ~0);
diff --git a/arch/mips/kernel/smp-cps.c b/arch/mips/kernel/smp-cps.c
index 62f677b2306f..dd55d59b88db 100644
--- a/arch/mips/kernel/smp-cps.c
+++ b/arch/mips/kernel/smp-cps.c
@@ -25,24 +25,13 @@
 #include <asm/time.h>
 #include <asm/uasm.h>
 
-static bool threads_disabled;
 static DECLARE_BITMAP(core_power, NR_CPUS);
 
 struct core_boot_config *mips_cps_core_bootcfg;
 
-static int __init setup_nothreads(char *s)
+static unsigned __init core_vpe_count(unsigned int cluster, unsigned core)
 {
-	threads_disabled = true;
-	return 0;
-}
-early_param("nothreads", setup_nothreads);
-
-static unsigned core_vpe_count(unsigned int cluster, unsigned core)
-{
-	if (threads_disabled)
-		return 1;
-
-	return mips_cps_numvps(cluster, core);
+	return min(smp_max_threads, mips_cps_numvps(cluster, core));
 }
 
 static void __init cps_smp_setup(void)
@@ -503,8 +492,7 @@ void play_dead(void)
 		}
 	}
 
-	/* This CPU has chosen its way out */
-	(void)cpu_report_death();
+	cpuhp_ap_report_dead();
 
 	cps_shutdown_this_cpu(cpu_death);
 
@@ -527,7 +515,9 @@ static void wait_for_sibling_halt(void *ptr_cpu)
 	} while (!(halted & TCHALT_H));
 }
 
-static void cps_cpu_die(unsigned int cpu)
+static void cps_cpu_die(unsigned int cpu) { }
+
+static void cps_cleanup_dead_cpu(unsigned cpu)
 {
 	unsigned core = cpu_core(&cpu_data[cpu]);
 	unsigned int vpe_id = cpu_vpe_id(&cpu_data[cpu]);
@@ -535,12 +525,6 @@ static void cps_cpu_die(unsigned int cpu)
 	unsigned stat;
 	int err;
 
-	/* Wait for the cpu to choose its way out */
-	if (!cpu_wait_death(cpu, 5)) {
-		pr_err("CPU%u: didn't offline\n", cpu);
-		return;
-	}
-
 	/*
 	 * Now wait for the CPU to actually offline. Without doing this that
 	 * offlining may race with one or more of:
@@ -624,6 +608,7 @@ static const struct plat_smp_ops cps_smp_ops = {
 #ifdef CONFIG_HOTPLUG_CPU
 	.cpu_disable		= cps_cpu_disable,
 	.cpu_die		= cps_cpu_die,
+	.cleanup_dead_cpu	= cps_cleanup_dead_cpu,
 #endif
 #ifdef CONFIG_KEXEC
 	.kexec_nonboot_cpu	= cps_kexec_nonboot_cpu,
diff --git a/arch/mips/kernel/smp-mt.c b/arch/mips/kernel/smp-mt.c
index 5f04a0141068..7729cc733421 100644
--- a/arch/mips/kernel/smp-mt.c
+++ b/arch/mips/kernel/smp-mt.c
@@ -46,7 +46,8 @@ static void __init smvp_copy_vpe_config(void)
 static unsigned int __init smvp_vpe_init(unsigned int tc, unsigned int mvpconf0,
 	unsigned int ncpu)
 {
-	if (tc > ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT))
+	if (tc >= smp_max_threads ||
+		(tc > ((mvpconf0 & MVPCONF0_PVPE) >> MVPCONF0_PVPE_SHIFT)))
 		return ncpu;
 
 	/* Deactivate all but VPE 0 */
diff --git a/arch/mips/kernel/smp.c b/arch/mips/kernel/smp.c
index 1d93b85271ba..8fbef537fb88 100644
--- a/arch/mips/kernel/smp.c
+++ b/arch/mips/kernel/smp.c
@@ -73,6 +73,24 @@ static cpumask_t cpu_core_setup_map;
 
 cpumask_t cpu_coherent_mask;
 
+unsigned int smp_max_threads __initdata = UINT_MAX;
+
+static int __init early_nosmt(char *s)
+{
+	smp_max_threads = 1;
+	return 0;
+}
+early_param("nosmt", early_nosmt);
+
+static int __init early_smt(char *s)
+{
+	get_option(&s, &smp_max_threads);
+	/* Ensure at least one thread is available */
+	smp_max_threads = clamp_val(smp_max_threads, 1U, UINT_MAX);
+	return 0;
+}
+early_param("smt", early_smt);
+
 #ifdef CONFIG_GENERIC_IRQ_IPI
 static struct irq_desc *call_desc;
 static struct irq_desc *sched_desc;
@@ -690,6 +708,14 @@ void flush_tlb_one(unsigned long vaddr)
 EXPORT_SYMBOL(flush_tlb_page);
 EXPORT_SYMBOL(flush_tlb_one);
 
+#ifdef CONFIG_HOTPLUG_CORE_SYNC_DEAD
+void arch_cpuhp_cleanup_dead_cpu(unsigned int cpu)
+{
+	if (mp_ops->cleanup_dead_cpu)
+		mp_ops->cleanup_dead_cpu(cpu);
+}
+#endif
+
 #ifdef CONFIG_GENERIC_CLOCKEVENTS_BROADCAST
 
 static void tick_broadcast_callee(void *info)
diff --git a/arch/mips/kernel/syscalls/syscall_n32.tbl b/arch/mips/kernel/syscalls/syscall_n32.tbl
index 253ff994ed2e..1976317d4e8b 100644
--- a/arch/mips/kernel/syscalls/syscall_n32.tbl
+++ b/arch/mips/kernel/syscalls/syscall_n32.tbl
@@ -389,3 +389,4 @@
 448	n32	process_mrelease		sys_process_mrelease
 449	n32	futex_waitv			sys_futex_waitv
 450	n32	set_mempolicy_home_node		sys_set_mempolicy_home_node
+451	n32	cachestat			sys_cachestat
diff --git a/arch/mips/kernel/syscalls/syscall_n64.tbl b/arch/mips/kernel/syscalls/syscall_n64.tbl
index 3f1886ad9d80..cfda2511badf 100644
--- a/arch/mips/kernel/syscalls/syscall_n64.tbl
+++ b/arch/mips/kernel/syscalls/syscall_n64.tbl
@@ -365,3 +365,4 @@
 448	n64	process_mrelease		sys_process_mrelease
 449	n64	futex_waitv			sys_futex_waitv
 450	common	set_mempolicy_home_node		sys_set_mempolicy_home_node
+451	n64	cachestat			sys_cachestat
diff --git a/arch/mips/kernel/syscalls/syscall_o32.tbl b/arch/mips/kernel/syscalls/syscall_o32.tbl
index 8f243e35a7b2..7692234c3768 100644
--- a/arch/mips/kernel/syscalls/syscall_o32.tbl
+++ b/arch/mips/kernel/syscalls/syscall_o32.tbl
@@ -438,3 +438,4 @@
 448	o32	process_mrelease		sys_process_mrelease
 449	o32	futex_waitv			sys_futex_waitv
 450	o32	set_mempolicy_home_node		sys_set_mempolicy_home_node
+451	o32	cachestat			sys_cachestat
diff --git a/arch/mips/kernel/unaligned.c b/arch/mips/kernel/unaligned.c
index 7b5aba5df02e..f4cf94e92ec3 100644
--- a/arch/mips/kernel/unaligned.c
+++ b/arch/mips/kernel/unaligned.c
@@ -160,6 +160,47 @@ static void emulate_load_store_insn(struct pt_regs *regs,
 		 * The remaining opcodes are the ones that are really of
 		 * interest.
 		 */
+#ifdef CONFIG_MACH_INGENIC
+	case spec2_op:
+		if (insn.mxu_lx_format.func != mxu_lx_op)
+			goto sigbus; /* other MXU instructions we don't care */
+
+		switch (insn.mxu_lx_format.op) {
+		case mxu_lxw_op:
+			if (user && !access_ok(addr, 4))
+				goto sigbus;
+			LoadW(addr, value, res);
+			if (res)
+				goto fault;
+			compute_return_epc(regs);
+			regs->regs[insn.mxu_lx_format.rd] = value;
+			break;
+		case mxu_lxh_op:
+			if (user && !access_ok(addr, 2))
+				goto sigbus;
+			LoadHW(addr, value, res);
+			if (res)
+				goto fault;
+			compute_return_epc(regs);
+			regs->regs[insn.dsp_format.rd] = value;
+			break;
+		case mxu_lxhu_op:
+			if (user && !access_ok(addr, 2))
+				goto sigbus;
+			LoadHWU(addr, value, res);
+			if (res)
+				goto fault;
+			compute_return_epc(regs);
+			regs->regs[insn.dsp_format.rd] = value;
+			break;
+		case mxu_lxb_op:
+		case mxu_lxbu_op:
+			goto sigbus;
+		default:
+			goto sigill;
+		}
+		break;
+#endif
 	case spec3_op:
 		if (insn.dsp_format.func == lx_op) {
 			switch (insn.dsp_format.op) {