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Date: Fri, 29 Mar 2024 09:27:25 +0100
From: Alexandre Ghiti <alex@...ti.fr>
To: Alexandre Ghiti <alexghiti@...osinc.com>,
Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt
<palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
linux-riscv@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] riscv: Call secondary mmu notifier when flushing the
tlb
Hi Palmer,
On 28/03/2024 08:38, Alexandre Ghiti wrote:
> This is required to allow the IOMMU driver to correctly flush its own
> TLB.
>
> Signed-off-by: Alexandre Ghiti <alexghiti@...osinc.com>
> ---
>
> Changes in v2:
> - Rebase on top of 6.9-rc1
>
> arch/riscv/mm/tlbflush.c | 39 +++++++++++++++++++++++----------------
> 1 file changed, 23 insertions(+), 16 deletions(-)
>
> diff --git a/arch/riscv/mm/tlbflush.c b/arch/riscv/mm/tlbflush.c
> index 893566e004b7..854d984deb07 100644
> --- a/arch/riscv/mm/tlbflush.c
> +++ b/arch/riscv/mm/tlbflush.c
> @@ -4,6 +4,7 @@
> #include <linux/smp.h>
> #include <linux/sched.h>
> #include <linux/hugetlb.h>
> +#include <linux/mmu_notifier.h>
> #include <asm/sbi.h>
> #include <asm/mmu_context.h>
>
> @@ -99,11 +100,19 @@ static void __ipi_flush_tlb_range_asid(void *info)
> local_flush_tlb_range_asid(d->start, d->size, d->stride, d->asid);
> }
>
> -static void __flush_tlb_range(struct cpumask *cmask, unsigned long asid,
> +static inline unsigned long get_mm_asid(struct mm_struct *mm)
> +{
> + return (mm && static_branch_unlikely(&use_asid_allocator)) ?
> + atomic_long_read(&mm->context.id) & asid_mask : FLUSH_TLB_NO_ASID;
> +}
> +
> +static void __flush_tlb_range(struct mm_struct *mm,
> + struct cpumask *cmask,
> unsigned long start, unsigned long size,
> unsigned long stride)
> {
> struct flush_tlb_range_data ftd;
> + unsigned long asid = get_mm_asid(mm);
> bool broadcast;
>
> if (cpumask_empty(cmask))
> @@ -137,31 +146,26 @@ static void __flush_tlb_range(struct cpumask *cmask, unsigned long asid,
>
> if (cmask != cpu_online_mask)
> put_cpu();
> -}
>
> -static inline unsigned long get_mm_asid(struct mm_struct *mm)
> -{
> - return static_branch_unlikely(&use_asid_allocator) ?
> - atomic_long_read(&mm->context.id) & asid_mask : FLUSH_TLB_NO_ASID;
> + if (mm)
> + mmu_notifier_arch_invalidate_secondary_tlbs(mm, start, start + size);
> }
>
> void flush_tlb_mm(struct mm_struct *mm)
> {
> - __flush_tlb_range(mm_cpumask(mm), get_mm_asid(mm),
> - 0, FLUSH_TLB_MAX_SIZE, PAGE_SIZE);
> + __flush_tlb_range(mm, mm_cpumask(mm), 0, FLUSH_TLB_MAX_SIZE, PAGE_SIZE);
> }
>
> void flush_tlb_mm_range(struct mm_struct *mm,
> unsigned long start, unsigned long end,
> unsigned int page_size)
> {
> - __flush_tlb_range(mm_cpumask(mm), get_mm_asid(mm),
> - start, end - start, page_size);
> + __flush_tlb_range(mm, mm_cpumask(mm), start, end - start, page_size);
> }
>
> void flush_tlb_page(struct vm_area_struct *vma, unsigned long addr)
> {
> - __flush_tlb_range(mm_cpumask(vma->vm_mm), get_mm_asid(vma->vm_mm),
> + __flush_tlb_range(vma->vm_mm, mm_cpumask(vma->vm_mm),
> addr, PAGE_SIZE, PAGE_SIZE);
> }
>
> @@ -194,13 +198,13 @@ void flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
> }
> }
>
> - __flush_tlb_range(mm_cpumask(vma->vm_mm), get_mm_asid(vma->vm_mm),
> + __flush_tlb_range(vma->vm_mm, mm_cpumask(vma->vm_mm),
> start, end - start, stride_size);
> }
>
> void flush_tlb_kernel_range(unsigned long start, unsigned long end)
> {
> - __flush_tlb_range((struct cpumask *)cpu_online_mask, FLUSH_TLB_NO_ASID,
> + __flush_tlb_range(NULL, (struct cpumask *)cpu_online_mask,
> start, end - start, PAGE_SIZE);
> }
>
> @@ -208,7 +212,7 @@ void flush_tlb_kernel_range(unsigned long start, unsigned long end)
> void flush_pmd_tlb_range(struct vm_area_struct *vma, unsigned long start,
> unsigned long end)
> {
> - __flush_tlb_range(mm_cpumask(vma->vm_mm), get_mm_asid(vma->vm_mm),
> + __flush_tlb_range(vma->vm_mm, mm_cpumask(vma->vm_mm),
> start, end - start, PMD_SIZE);
> }
> #endif
> @@ -222,7 +226,10 @@ void arch_tlbbatch_add_pending(struct arch_tlbflush_unmap_batch *batch,
> struct mm_struct *mm,
> unsigned long uaddr)
> {
> + unsigned long start = uaddr & PAGE_MASK;
> +
> cpumask_or(&batch->cpumask, &batch->cpumask, mm_cpumask(mm));
> + mmu_notifier_arch_invalidate_secondary_tlbs(mm, start, start + PAGE_SIZE);
> }
>
> void arch_flush_tlb_batched_pending(struct mm_struct *mm)
> @@ -232,7 +239,7 @@ void arch_flush_tlb_batched_pending(struct mm_struct *mm)
>
> void arch_tlbbatch_flush(struct arch_tlbflush_unmap_batch *batch)
> {
> - __flush_tlb_range(&batch->cpumask, FLUSH_TLB_NO_ASID, 0,
> - FLUSH_TLB_MAX_SIZE, PAGE_SIZE);
> + __flush_tlb_range(NULL, &batch->cpumask,
> + 0, FLUSH_TLB_MAX_SIZE, PAGE_SIZE);
> cpumask_clear(&batch->cpumask);
> }
This will conflict with Samuel's patch
https://lore.kernel.org/all/20240301201837.2826172-1-samuel.holland@sifive.com/
<https://lore.kernel.org/all/20240301201837.2826172-1-samuel.holland@sifive.com/>
Here is the resolution conflict if you pull this patch as-is, otherwise
I'll send a v3:
diff --cc arch/riscv/mm/tlbflush.c
index 07d743f87b3f,854d984deb07..000000000000
--- a/arch/riscv/mm/tlbflush.c
+++ b/arch/riscv/mm/tlbflush.c
@@@ -99,7 -100,14 +100,14 @@@ static void __ipi_flush_tlb_range_asid(
local_flush_tlb_range_asid(d->start, d->size, d->stride, d->asid);
}
- static void __flush_tlb_range(const struct cpumask *cmask, unsigned
long asid,
+ static inline unsigned long get_mm_asid(struct mm_struct *mm)
+ {
+ return (mm && static_branch_unlikely(&use_asid_allocator)) ?
+ atomic_long_read(&mm->context.id) & asid_mask :
FLUSH_TLB_NO_ASID;
+ }
+
+ static void __flush_tlb_range(struct mm_struct *mm,
- struct cpumask *cmask,
++ const struct cpumask *cmask,
unsigned long start, unsigned long size,
unsigned long stride)
{
@@@ -200,7 -204,7 +204,7 @@@ void flush_tlb_range(struct vm_area_str
void flush_tlb_kernel_range(unsigned long start, unsigned long end)
{
- __flush_tlb_range(cpu_online_mask, FLUSH_TLB_NO_ASID,
- __flush_tlb_range(NULL, (struct cpumask *)cpu_online_mask,
++ __flush_tlb_range(NULL, cpu_online_mask,
start, end - start, PAGE_SIZE);
}
Thanks,
Alex
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