diff --git a/arch/loongarch/include/asm/cpu-info.h b/arch/loongarch/include/asm/cpu-info.h
index 35e0a230a484..7f5bc0ad9d50 100644
--- a/arch/loongarch/include/asm/cpu-info.h
+++ b/arch/loongarch/include/asm/cpu-info.h
@@ -76,27 +76,6 @@ extern const char *__cpu_full_name[];
#define cpu_family_string() __cpu_family[raw_smp_processor_id()]
#define cpu_full_name_string() __cpu_full_name[raw_smp_processor_id()]
-struct seq_file;
-struct notifier_block;
-
-extern int register_proc_cpuinfo_notifier(struct notifier_block *nb);
-extern int proc_cpuinfo_notifier_call_chain(unsigned long val, void *v);
-
-#define proc_cpuinfo_notifier(fn, pri) \
-({ \
- static struct notifier_block fn##_nb = { \
- .notifier_call = fn, \
- .priority = pri \
- }; \
- \
- register_proc_cpuinfo_notifier(&fn##_nb); \
-})
-
-struct proc_cpuinfo_notifier_args {
- struct seq_file *m;
- unsigned long n;
-};
-
static inline bool cpus_are_siblings(int cpua, int cpub)
{
struct cpuinfo_loongarch *infoa = &cpu_data[cpua];
diff --git a/arch/loongarch/include/asm/smp.h b/arch/loongarch/include/asm/smp.h
index 3383c9d24e94..b87d1d5e5890 100644
--- a/arch/loongarch/include/asm/smp.h
+++ b/arch/loongarch/include/asm/smp.h
@@ -77,6 +77,8 @@ extern int __cpu_logical_map[NR_CPUS];
#define SMP_IRQ_WORK BIT(ACTION_IRQ_WORK)
#define SMP_CLEAR_VECTOR BIT(ACTION_CLEAR_VECTOR)
+struct seq_file;
+
struct secondary_data {
unsigned long stack;
unsigned long thread_info;
diff --git a/arch/loongarch/kernel/genex.S b/arch/loongarch/kernel/genex.S
index 86d5d90ebefe..4f0912141781 100644
--- a/arch/loongarch/kernel/genex.S
+++ b/arch/loongarch/kernel/genex.S
@@ -18,16 +18,19 @@
.align 5
SYM_FUNC_START(__arch_cpu_idle)
- /* start of rollback region */
- LONG_L t0, tp, TI_FLAGS
- nop
- andi t0, t0, _TIF_NEED_RESCHED
- bnez t0, 1f
- nop
- nop
- nop
+ /* start of idle interrupt region */
+ ori t0, zero, CSR_CRMD_IE
+ /* idle instruction needs irq enabled */
+ csrxchg t0, t0, LOONGARCH_CSR_CRMD
+ /*
+ * If an interrupt lands here; between enabling interrupts above and
+ * going idle on the next instruction, we must *NOT* go idle since the
+ * interrupt could have set TIF_NEED_RESCHED or caused an timer to need
+ * reprogramming. Fall through -- see handle_vint() below -- and have
+ * the idle loop take care of things.
+ */
idle 0
- /* end of rollback region */
+ /* end of idle interrupt region */
1: jr ra
SYM_FUNC_END(__arch_cpu_idle)
@@ -35,11 +38,10 @@ SYM_CODE_START(handle_vint)
UNWIND_HINT_UNDEFINED
BACKUP_T0T1
SAVE_ALL
- la_abs t1, __arch_cpu_idle
+ la_abs t1, 1b
LONG_L t0, sp, PT_ERA
- /* 32 byte rollback region */
- ori t0, t0, 0x1f
- xori t0, t0, 0x1f
+ /* 3 instructions idle interrupt region */
+ ori t0, t0, 0b1100
bne t0, t1, 1f
LONG_S t0, sp, PT_ERA
1: move a0, sp
diff --git a/arch/loongarch/kernel/idle.c b/arch/loongarch/kernel/idle.c
index 0b5dd2faeb90..54b247d8cdb6 100644
--- a/arch/loongarch/kernel/idle.c
+++ b/arch/loongarch/kernel/idle.c
@@ -11,7 +11,6 @@
void __cpuidle arch_cpu_idle(void)
{
- raw_local_irq_enable();
- __arch_cpu_idle(); /* idle instruction needs irq enabled */
+ __arch_cpu_idle();
raw_local_irq_disable();
}
diff --git a/arch/loongarch/kernel/proc.c b/arch/loongarch/kernel/proc.c
index 6ce46d92f1f1..cea30768ae92 100644
--- a/arch/loongarch/kernel/proc.c
+++ b/arch/loongarch/kernel/proc.c
@@ -13,28 +13,12 @@
#include <asm/processor.h>
#include <asm/time.h>
-/*
- * No lock; only written during early bootup by CPU 0.
- */
-static RAW_NOTIFIER_HEAD(proc_cpuinfo_chain);
-
-int __ref register_proc_cpuinfo_notifier(struct notifier_block *nb)
-{
- return raw_notifier_chain_register(&proc_cpuinfo_chain, nb);
-}
-
-int proc_cpuinfo_notifier_call_chain(unsigned long val, void *v)
-{
- return raw_notifier_call_chain(&proc_cpuinfo_chain, val, v);
-}
-
static int show_cpuinfo(struct seq_file *m, void *v)
{
unsigned long n = (unsigned long) v - 1;
unsigned int isa = cpu_data[n].isa_level;
unsigned int version = cpu_data[n].processor_id & 0xff;
unsigned int fp_version = cpu_data[n].fpu_vers;
- struct proc_cpuinfo_notifier_args proc_cpuinfo_notifier_args;
#ifdef CONFIG_SMP
if (!cpu_online(n))
@@ -91,20 +75,13 @@ static int show_cpuinfo(struct seq_file *m, void *v)
if (cpu_has_lbt_mips) seq_printf(m, " lbt_mips");
seq_printf(m, "\n");
- seq_printf(m, "Hardware Watchpoint\t: %s",
- cpu_has_watch ? "yes, " : "no\n");
+ seq_printf(m, "Hardware Watchpoint\t: %s", str_yes_no(cpu_has_watch));
if (cpu_has_watch) {
- seq_printf(m, "iwatch count: %d, dwatch count: %d\n",
+ seq_printf(m, ", iwatch count: %d, dwatch count: %d",
cpu_data[n].watch_ireg_count, cpu_data[n].watch_dreg_count);
}
- proc_cpuinfo_notifier_args.m = m;
- proc_cpuinfo_notifier_args.n = n;
-
- raw_notifier_call_chain(&proc_cpuinfo_chain, 0,
- &proc_cpuinfo_notifier_args);
-
- seq_printf(m, "\n");
+ seq_printf(m, "\n\n");
return 0;
}
diff --git a/arch/loongarch/kernel/reset.c b/arch/loongarch/kernel/reset.c
index 1ef8c6383535..de8fa5a8a825 100644
--- a/arch/loongarch/kernel/reset.c
+++ b/arch/loongarch/kernel/reset.c
@@ -33,7 +33,7 @@ void machine_halt(void)
console_flush_on_panic(CONSOLE_FLUSH_PENDING);
while (true) {
- __arch_cpu_idle();
+ __asm__ __volatile__("idle 0" : : : "memory");
}
}
@@ -53,7 +53,7 @@ void machine_power_off(void)
#endif
while (true) {
- __arch_cpu_idle();
+ __asm__ __volatile__("idle 0" : : : "memory");
}
}
@@ -74,6 +74,6 @@ void machine_restart(char *command)
acpi_reboot();
while (true) {
- __arch_cpu_idle();
+ __asm__ __volatile__("idle 0" : : : "memory");
}
}
diff --git a/arch/loongarch/kvm/main.c b/arch/loongarch/kvm/main.c
index bf9268bf26d5..f6d3242b9234 100644
--- a/arch/loongarch/kvm/main.c
+++ b/arch/loongarch/kvm/main.c
@@ -303,9 +303,9 @@ int kvm_arch_enable_virtualization_cpu(void)
* TOE=0: Trap on Exception.
* TIT=0: Trap on Timer.
*/
- if (env & CSR_GCFG_GCIP_ALL)
+ if (env & CSR_GCFG_GCIP_SECURE)
gcfg |= CSR_GCFG_GCI_SECURE;
- if (env & CSR_GCFG_MATC_ROOT)
+ if (env & CSR_GCFG_MATP_ROOT)
gcfg |= CSR_GCFG_MATC_ROOT;
write_csr_gcfg(gcfg);
diff --git a/arch/loongarch/kvm/switch.S b/arch/loongarch/kvm/switch.S
index 0c292f818492..1be185e94807 100644
--- a/arch/loongarch/kvm/switch.S
+++ b/arch/loongarch/kvm/switch.S
@@ -85,7 +85,7 @@
* Guest CRMD comes from separate GCSR_CRMD register
*/
ori t0, zero, CSR_PRMD_PIE
- csrxchg t0, t0, LOONGARCH_CSR_PRMD
+ csrwr t0, LOONGARCH_CSR_PRMD
/* Set PVM bit to setup ertn to guest context */
ori t0, zero, CSR_GSTAT_PVM
diff --git a/arch/loongarch/kvm/vcpu.c b/arch/loongarch/kvm/vcpu.c
index fb72095c8077..20f941af3e9e 100644
--- a/arch/loongarch/kvm/vcpu.c
+++ b/arch/loongarch/kvm/vcpu.c
@@ -1548,9 +1548,6 @@ static int _kvm_vcpu_load(struct kvm_vcpu *vcpu, int cpu)
/* Restore timer state regardless */
kvm_restore_timer(vcpu);
-
- /* Control guest page CCA attribute */
- change_csr_gcfg(CSR_GCFG_MATC_MASK, CSR_GCFG_MATC_ROOT);
kvm_make_request(KVM_REQ_STEAL_UPDATE, vcpu);
/* Restore hardware PMU CSRs */
diff --git a/arch/loongarch/lib/csum.c b/arch/loongarch/lib/csum.c
index a5e84b403c3b..df309ae4045d 100644
--- a/arch/loongarch/lib/csum.c
+++ b/arch/loongarch/lib/csum.c
@@ -25,7 +25,7 @@ unsigned int __no_sanitize_address do_csum(const unsigned char *buff, int len)
const u64 *ptr;
u64 data, sum64 = 0;
- if (unlikely(len == 0))
+ if (unlikely(len <= 0))
return 0;
offset = (unsigned long)buff & 7;
diff --git a/arch/loongarch/mm/pageattr.c b/arch/loongarch/mm/pageattr.c
index bf8678248444..99165903908a 100644
--- a/arch/loongarch/mm/pageattr.c
+++ b/arch/loongarch/mm/pageattr.c
@@ -3,6 +3,7 @@
* Copyright (C) 2024 Loongson Technology Corporation Limited
*/
+#include <linux/memblock.h>
#include <linux/pagewalk.h>
#include <linux/pgtable.h>
#include <asm/set_memory.h>
@@ -167,7 +168,7 @@ bool kernel_page_present(struct page *page)
unsigned long addr = (unsigned long)page_address(page);
if (addr < vm_map_base)
- return true;
+ return memblock_is_memory(__pa(addr));
pgd = pgd_offset_k(addr);
if (pgd_none(pgdp_get(pgd)))