d4748276ae
There are several cases outside the normal address space management
where a CPU's entire local TLB is to be flushed:
1. Booting the kernel, in case something has left stale entries in
the TLB (e.g., kexec).
2. Machine check, to clean corrupted TLB entries.
One other place where the TLB is flushed, is waking from deep idle
states. The flush is a side-effect of calling ->cpu_restore with the
intention of re-setting various SPRs. The flush itself is unnecessary
because in the first case, the TLB should not acquire new corrupted
TLB entries as part of sleep/wake (though they may be lost).
This type of TLB flush is coded inflexibly, several times for each CPU
type, and they have a number of problems with ISA v3.0B:
- The current radix mode of the MMU is not taken into account, it is
always done as a hash flushn For IS=2 (LPID-matching flush from host)
and IS=3 with HV=0 (guest kernel flush), tlbie(l) is undefined if
the R field does not match the current radix mode.
- ISA v3.0B hash must flush the partition and process table caches as
well.
- ISA v3.0B radix must flush partition and process scoped translations,
partition and process table caches, and also the page walk cache.
So consolidate the flushing code and implement it in C and inline asm
under the mm/ directory with the rest of the flush code. Add ISA v3.0B
cases for radix and hash, and use the radix flush in radix environment.
Provide a way for IS=2 (LPID flush) to specify the radix mode of the
partition. Have KVM pass in the radix mode of the guest.
Take out the flushes from early cputable/dt_cpu_ftrs detection hooks,
and move it later in the boot process after, the MMU registers are set
up and before relocation is first turned on.
The TLB flush is no longer called when restoring from deep idle states.
This was not be done as a separate step because booting secondaries
uses the same cpu_restore as idle restore, which needs the TLB flush.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
54 lines
2.3 KiB
C
54 lines
2.3 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef _ASM_POWERPC_TLBFLUSH_RADIX_H
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#define _ASM_POWERPC_TLBFLUSH_RADIX_H
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struct vm_area_struct;
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struct mm_struct;
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struct mmu_gather;
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static inline int mmu_get_ap(int psize)
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{
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return mmu_psize_defs[psize].ap;
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}
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extern void radix__tlbiel_all(unsigned int action);
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extern void radix__flush_hugetlb_tlb_range(struct vm_area_struct *vma,
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unsigned long start, unsigned long end);
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extern void radix__flush_tlb_range_psize(struct mm_struct *mm, unsigned long start,
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unsigned long end, int psize);
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extern void radix__flush_pmd_tlb_range(struct vm_area_struct *vma,
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unsigned long start, unsigned long end);
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extern void radix__flush_tlb_range(struct vm_area_struct *vma, unsigned long start,
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unsigned long end);
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extern void radix__flush_tlb_kernel_range(unsigned long start, unsigned long end);
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extern void radix__local_flush_tlb_mm(struct mm_struct *mm);
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extern void radix__local_flush_all_mm(struct mm_struct *mm);
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extern void radix__local_flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
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extern void radix__local_flush_tlb_page_psize(struct mm_struct *mm, unsigned long vmaddr,
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int psize);
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extern void radix__tlb_flush(struct mmu_gather *tlb);
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#ifdef CONFIG_SMP
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extern void radix__flush_tlb_mm(struct mm_struct *mm);
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extern void radix__flush_all_mm(struct mm_struct *mm);
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extern void radix__flush_tlb_page(struct vm_area_struct *vma, unsigned long vmaddr);
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extern void radix__flush_tlb_page_psize(struct mm_struct *mm, unsigned long vmaddr,
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int psize);
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#else
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#define radix__flush_tlb_mm(mm) radix__local_flush_tlb_mm(mm)
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#define radix__flush_all_mm(mm) radix__local_flush_all_mm(mm)
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#define radix__flush_tlb_page(vma,addr) radix__local_flush_tlb_page(vma,addr)
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#define radix__flush_tlb_page_psize(mm,addr,p) radix__local_flush_tlb_page_psize(mm,addr,p)
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#endif
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extern void radix__flush_tlb_pwc(struct mmu_gather *tlb, unsigned long addr);
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extern void radix__flush_tlb_collapsed_pmd(struct mm_struct *mm, unsigned long addr);
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extern void radix__flush_tlb_lpid_va(unsigned long lpid, unsigned long gpa,
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unsigned long page_size);
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extern void radix__flush_tlb_lpid(unsigned long lpid);
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extern void radix__flush_tlb_all(void);
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extern void radix__flush_tlb_pte_p9_dd1(unsigned long old_pte, struct mm_struct *mm,
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unsigned long address);
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#endif
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