powerpc/32s: Implement local_flush_tlb_page_psize()

There's a single call to local_flush_tlb_page_psize() in the code
patching code. That call is never executed on 32-bit Book3S,
because it's guarded by mm_patch_enabled() which is essentially a
radix_enabled() check, which is always false on 32s.

However depending on how the optimiser sees things it may still trip
over the BUILD_BUG() in the 32s stub of local_flush_tlb_page_psize().

To avoid that, implement it in terms of flush_range() so that if it ever
becomes called it should function, even if not optimally.

Note that flush_range() deals with page aligning the address and so on,
and that 32s doesn't support huge pages so there should be no issue with
non-standard page sizes needing to be flushed.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/20231023092319.1507325-1-mpe@ellerman.id.au

powerpc/tlb: Add local flush for page given mm_struct and psize

Adds a local TLB flush operation that works given an mm_struct, VA to
flush, and page size representation. Most implementations mirror the
surrounding code. The book3s/32/tlbflush.h implementation is left as
a BUILD_BUG because it is more complicated and not required for
anything as yet.

This removes the need to create a vm_area_struct, which the temporary
patching mm work does not need.

Signed-off-by: Benjamin Gray <bgray@linux.ibm.com>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20221109045112.187069-8-bgray@linux.ibm.com

powerpc: Fix misspellings in tlbflush.h

The comment marking the end of the include guard is wrong, fix it up.

Signed-off-by: Zhang Yunkai <zhang.yunkai@zte.com.cn>
[mpe: Rewrite commit message]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20210304031318.188447-1-zhang.yunkai@zte.com.cn

powerpc/32s: Inline tlb_flush()

On book3s/32, tlb_flush() does nothing when the CPU has a hash table,
it calls _tlbia() otherwise.

Inline it.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/ebc933d1c530a19ef3cf7983f6ae94814f6e92ac.1603348103.git.christophe.leroy@csgroup.eu

powerpc/32s: Split and inline flush_range()

flush_range() handle both the MMU_FTR_HPTE_TABLE case and
the other case.

The non MMU_FTR_HPTE_TABLE case is trivial as it is only a call
to _tlbie()/_tlbia() which is not worth a dedicated function.

Make flush_range() a hash specific and call it from tlbflush.h based
on mmu_has_feature(MMU_FTR_HPTE_TABLE).

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/132ab19aae52abc8e06ab524ec86d4229b5b9c3d.1603348103.git.christophe.leroy@csgroup.eu

powerpc/32s: Inline flush_tlb_range() and flush_tlb_kernel_range()

flush_tlb_range() and flush_tlb_kernel_range() are trivial calls to
flush_range().

Make flush_range() global and inline flush_tlb_range()
and flush_tlb_kernel_range().

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/c7029a78e78709ad9272d7a44260e06b649169b2.1603348103.git.christophe.leroy@csgroup.eu

powerpc/32s: Split and inline flush_tlb_mm() and flush_tlb_page()

flush_tlb_mm() and flush_tlb_page() handle both the MMU_FTR_HPTE_TABLE
case and the other case.

The non MMU_FTR_HPTE_TABLE case is trivial as it is only a call
to _tlbie()/_tlbia() which is not worth a dedicated function.

Make flush_tlb_mm() and flush_tlb_page() hash specific and call
them from tlbflush.h based on mmu_has_feature(MMU_FTR_HPTE_TABLE).

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/11e932ded41ba6d9b251d89b7afa33cc060d3aa4.1603348103.git.christophe.leroy@csgroup.eu

powerpc/32s: Inline _tlbie() on non SMP

On non SMP, _tlbie() is just a tlbie plus a sync instruction.

Make it static inline.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/475136425541db5c7c8a0395d19d400525b251bc.1603348103.git.christophe.leroy@csgroup.eu

powerpc/32s: Move _tlbie() and _tlbia() prototypes to tlbflush.h

In order to use _tlbie() and _tlbia() directly
from asm/book3s/32/tlbflush.h, move their prototypes
from mm/mm_decl.h to there.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/867587af929973ad65f8ef6972f2474a80c1737a.1603348103.git.christophe.leroy@csgroup.eu

powerpc/mm: Remove flush_tlb_page_nohash() prototype.

flush_tlb_page_nohash() was removed by
commit 703b41ad1a87 ("powerpc/mm: remove flush_tlb_page_nohash")

Remove stale prototype and comment.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/4a58831da6d6ba4fe309b94aa1dd8f02982d46b2.1603348103.git.christophe.leroy@csgroup.eu

powerpc: split asm/tlbflush.h

Split asm/tlbflush.h into:
asm/nohash/tlbflush.h
asm/book3s/32/tlbflush.h
asm/book3s/64/tlbflush.h (already existing)

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>