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riscv: Improve flush_tlb_range() for hugetlb pages

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flush_tlb_range() uses a fixed stride of PAGE_SIZE and in its current form,
when a hugetlb mapping needs to be flushed, flush_tlb_range() flushes the
whole tlb: so set a stride of the size of the hugetlb mapping in order to
only flush the hugetlb mapping. However, if the hugepage is a NAPOT region,
all PTEs that constitute this mapping must be invalidated, so the stride
size must actually be the size of the PTE.

Note that THPs are directly handled by flush_pmd_tlb_range().

Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Reviewed-by: Samuel Holland <samuel.holland@sifive.com>
Tested-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com> # On RZ/Five SMARC
Link: https://lore.kernel.org/r/20231030133027.19542-3-alexghiti@rivosinc.com
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
This commit is contained in:
Alexandre Ghiti 2023-10-30 14:30:26 +01:00 committed by Palmer Dabbelt
parent c5e9b2c2ae
commit c962a6e746
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GPG Key ID: 2E1319F35FBB1889
1 changed files with 28 additions and 1 deletions
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29
arch/riscv/mm/tlbflush.c
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@ -3,6 +3,7 @@
#include <linux/mm.h>
#include <linux/smp.h>
#include <linux/sched.h>
#include <linux/hugetlb.h>
#include <asm/sbi.h>
#include <asm/mmu_context.h>
@ -147,7 +148,33 @@ void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
unsigned long end)
{
__flush_tlb_range(vma->vm_mm, start, end - start, PAGE_SIZE);
unsigned long stride_size;
if (!is_vm_hugetlb_page(vma)) {
stride_size = PAGE_SIZE;
} else {
stride_size = huge_page_size(hstate_vma(vma));
/*
* As stated in the privileged specification, every PTE in a
* NAPOT region must be invalidated, so reset the stride in that
* case.
*/
if (has_svnapot()) {
if (stride_size >= PGDIR_SIZE)
stride_size = PGDIR_SIZE;
else if (stride_size >= P4D_SIZE)
stride_size = P4D_SIZE;
else if (stride_size >= PUD_SIZE)
stride_size = PUD_SIZE;
else if (stride_size >= PMD_SIZE)
stride_size = PMD_SIZE;
else
stride_size = PAGE_SIZE;
}
}
__flush_tlb_range(vma->vm_mm, start, end - start, stride_size);
}
#ifdef CONFIG_TRANSPARENT_HUGEPAGE
void flush_pmd_tlb_range(struct vm_area_struct *vma, unsigned long start,