1 files changed, 84 insertions, 2 deletions

diff --git a/arch/riscv/kernel/smpboot.c b/arch/riscv/kernel/smpboot.c
index 445a4efee267..bb0b76e1a6d4 100644
--- a/arch/riscv/kernel/smpboot.c
+++ b/arch/riscv/kernel/smpboot.c
@@ -8,6 +8,7 @@
  * Copyright (C) 2017 SiFive
  */
 
+#include <linux/acpi.h>
 #include <linux/arch_topology.h>
 #include <linux/module.h>
 #include <linux/init.h>
@@ -31,6 +32,8 @@
 #include <asm/tlbflush.h>
 #include <asm/sections.h>
 #include <asm/smp.h>
+#include <uapi/asm/hwcap.h>
+#include <asm/vector.h>
 
 #include "head.h"
 
@@ -70,7 +73,73 @@ void __init smp_prepare_cpus(unsigned int max_cpus)
 	}
 }
 
-void __init setup_smp(void)
+#ifdef CONFIG_ACPI
+static unsigned int cpu_count = 1;
+
+static int __init acpi_parse_rintc(union acpi_subtable_headers *header, const unsigned long end)
+{
+	unsigned long hart;
+	static bool found_boot_cpu;
+	struct acpi_madt_rintc *processor = (struct acpi_madt_rintc *)header;
+
+	/*
+	 * Each RINTC structure in MADT will have a flag. If ACPI_MADT_ENABLED
+	 * bit in the flag is not enabled, it means OS should not try to enable
+	 * the cpu to which RINTC belongs.
+	 */
+	if (!(processor->flags & ACPI_MADT_ENABLED))
+		return 0;
+
+	if (BAD_MADT_ENTRY(processor, end))
+		return -EINVAL;
+
+	acpi_table_print_madt_entry(&header->common);
+
+	hart = processor->hart_id;
+	if (hart == INVALID_HARTID) {
+		pr_warn("Invalid hartid\n");
+		return 0;
+	}
+
+	if (hart == cpuid_to_hartid_map(0)) {
+		BUG_ON(found_boot_cpu);
+		found_boot_cpu = true;
+		early_map_cpu_to_node(0, acpi_numa_get_nid(cpu_count));
+		return 0;
+	}
+
+	if (cpu_count >= NR_CPUS) {
+		pr_warn("NR_CPUS is too small for the number of ACPI tables.\n");
+		return 0;
+	}
+
+	cpuid_to_hartid_map(cpu_count) = hart;
+	early_map_cpu_to_node(cpu_count, acpi_numa_get_nid(cpu_count));
+	cpu_count++;
+
+	return 0;
+}
+
+static void __init acpi_parse_and_init_cpus(void)
+{
+	int cpuid;
+
+	cpu_set_ops(0);
+
+	acpi_table_parse_madt(ACPI_MADT_TYPE_RINTC, acpi_parse_rintc, 0);
+
+	for (cpuid = 1; cpuid < nr_cpu_ids; cpuid++) {
+		if (cpuid_to_hartid_map(cpuid) != INVALID_HARTID) {
+			cpu_set_ops(cpuid);
+			set_cpu_possible(cpuid, true);
+		}
+	}
+}
+#else
+#define acpi_parse_and_init_cpus(...)	do { } while (0)
+#endif
+
+static void __init of_parse_and_init_cpus(void)
 {
 	struct device_node *dn;
 	unsigned long hart;
@@ -81,7 +150,7 @@ void __init setup_smp(void)
 	cpu_set_ops(0);
 
 	for_each_of_cpu_node(dn) {
-		rc = riscv_of_processor_hartid(dn, &hart);
+		rc = riscv_early_of_processor_hartid(dn, &hart);
 		if (rc < 0)
 			continue;
 
@@ -116,6 +185,14 @@ void __init setup_smp(void)
 	}
 }
 
+void __init setup_smp(void)
+{
+	if (acpi_disabled)
+		of_parse_and_init_cpus();
+	else
+		acpi_parse_and_init_cpus();
+}
+
 static int start_secondary_cpu(int cpu, struct task_struct *tidle)
 {
 	if (cpu_ops[cpu]->cpu_start)
@@ -169,6 +246,11 @@ asmlinkage __visible void smp_callin(void)
 	set_cpu_online(curr_cpuid, 1);
 	probe_vendor_features(curr_cpuid);
 
+	if (has_vector()) {
+		if (riscv_v_setup_vsize())
+			elf_hwcap &= ~COMPAT_HWCAP_ISA_V;
+	}
+
 	/*
 	 * Remote TLB flushes are ignored while the CPU is offline, so emit
 	 * a local TLB flush right now just in case.