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-rw-r--r--arch/riscv/mm/tlbflush.c88
1 files changed, 88 insertions, 0 deletions
diff --git a/arch/riscv/mm/tlbflush.c b/arch/riscv/mm/tlbflush.c
new file mode 100644
index 000000000..ef701fa83
--- /dev/null
+++ b/arch/riscv/mm/tlbflush.c
@@ -0,0 +1,88 @@
+// SPDX-License-Identifier: GPL-2.0
+
+#include <linux/mm.h>
+#include <linux/smp.h>
+#include <linux/sched.h>
+#include <asm/sbi.h>
+#include <asm/mmu_context.h>
+
+static inline void local_flush_tlb_all_asid(unsigned long asid)
+{
+ __asm__ __volatile__ ("sfence.vma x0, %0"
+ :
+ : "r" (asid)
+ : "memory");
+}
+
+static inline void local_flush_tlb_page_asid(unsigned long addr,
+ unsigned long asid)
+{
+ __asm__ __volatile__ ("sfence.vma %0, %1"
+ :
+ : "r" (addr), "r" (asid)
+ : "memory");
+}
+
+void flush_tlb_all(void)
+{
+ sbi_remote_sfence_vma(NULL, 0, -1);
+}
+
+static void __sbi_tlb_flush_range(struct mm_struct *mm, unsigned long start,
+ unsigned long size, unsigned long stride)
+{
+ struct cpumask *cmask = mm_cpumask(mm);
+ unsigned int cpuid;
+ bool broadcast;
+
+ if (cpumask_empty(cmask))
+ return;
+
+ cpuid = get_cpu();
+ /* check if the tlbflush needs to be sent to other CPUs */
+ broadcast = cpumask_any_but(cmask, cpuid) < nr_cpu_ids;
+ if (static_branch_unlikely(&use_asid_allocator)) {
+ unsigned long asid = atomic_long_read(&mm->context.id) & asid_mask;
+
+ if (broadcast) {
+ sbi_remote_sfence_vma_asid(cmask, start, size, asid);
+ } else if (size <= stride) {
+ local_flush_tlb_page_asid(start, asid);
+ } else {
+ local_flush_tlb_all_asid(asid);
+ }
+ } else {
+ if (broadcast) {
+ sbi_remote_sfence_vma(cmask, start, size);
+ } else if (size <= stride) {
+ local_flush_tlb_page(start);
+ } else {
+ local_flush_tlb_all();
+ }
+ }
+
+ put_cpu();
+}
+
+void flush_tlb_mm(struct mm_struct *mm)
+{
+ __sbi_tlb_flush_range(mm, 0, -1, PAGE_SIZE);
+}
+
+void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
+{
+ __sbi_tlb_flush_range(vma->vm_mm, addr, PAGE_SIZE, PAGE_SIZE);
+}
+
+void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end)
+{
+ __sbi_tlb_flush_range(vma->vm_mm, start, end - start, PAGE_SIZE);
+}
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
+void flush_pmd_tlb_range(struct vm_area_struct *vma, unsigned long start,
+ unsigned long end)
+{
+ __sbi_tlb_flush_range(vma->vm_mm, start, end - start, PMD_SIZE);
+}
+#endif