powerpc/47x: Remove early_init_mmu_47x() to fix no previous prototype

4xx/iss476-smp_defconfig leads to:

CC arch/powerpc/mm/nohash/tlb.o
arch/powerpc/mm/nohash/tlb.c:322:13: error: no previous prototype for 'early_init_mmu_47x' [-Werror=missing-prototypes]
322 | void __init early_init_mmu_47x(void)
| ^~~~~~~~~~~~~~~~~~

early_init_mmu_47x() is used only at one place and only locally.

Fold it into its only caller and remove it.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://msgid.link/0a667b7c2e05d3cf41ecd38f33cc334083a61c8d.1692282396.git.christophe.leroy@csgroup.eu

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: Remove impossible mmu_psize_defs[] on nohash

Today there is:

if e500 or 8xx
if e500
mmu_psize_defs[] =
else if 8xx
mmu_psize_defs[] =
else
mmu_psize_defs[] =
endif
endif

The else leg is dead definition.

Drop that else leg and rewrite as:

if e500
mmu_psize_defs[] =
endif
if 8xx
mmu_psize_defs[] =
endif

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/030a843449f348c0b709ca5349640624f36a016f.1663606876.git.christophe.leroy@csgroup.eu

powerpc: Remove CONFIG_PPC_BOOK3E_MMU

CONFIG_PPC_BOOK3E_MMU is redundant with CONFIG_PPC_E500.

Remove it.

Also rename mmu-book3e.h to mmu-e500.h

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/c5549cd59a131204ff94ab909cad2e2dad4ddf2f.1663606876.git.christophe.leroy@csgroup.eu

powerpc: Remove CONFIG_PPC_FSL_BOOK3E

CONFIG_PPC_FSL_BOOK3E is redundant with CONFIG_PPC_E500.

Remove it.

And rename five files accordingly.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
[mpe: Rename include guards to match new file names]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/795cb93b88c9a0279289712e674f39e3b108a1b4.1663606876.git.christophe.leroy@csgroup.eu

powerpc: Remove CONFIG_FSL_BOOKE

PPC_85xx is PPC32 only.
PPC_85xx always selects E500 and is the only PPC32 that
selects E500.
FSL_BOOKE is selected when E500 and PPC32 are selected.

So FSL_BOOKE is redundant with PPC_85xx.

Remove FSL_BOOKE.

And rename four files accordingly.

cpu_setup_fsl_booke.S is not renamed because it is linked to
PPC_FSL_BOOK3E and not to FSL_BOOKE as suggested by its name.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/08e3e15594e66d63b9e89c5b4f9c35153913c28f.1663606875.git.christophe.leroy@csgroup.eu

powerpc/8xx: Simplify flush_tlb_kernel_range()

In the same spirit as commit 63f501e07a85 ("powerpc/8xx: Simplify TLB
handling"), simplify flush_tlb_kernel_range() for 8xx.

8xx cannot be SMP, and has 'tlbie' and 'tlbia' instructions, so
an inline version of flush_tlb_kernel_range() for 8xx is worth it.

With this page, first leg of change_page_attr() is:

2c: 55 29 00 3c rlwinm r9,r9,0,0,30
30: 91 23 00 00 stw r9,0(r3)
34: 7c 00 22 64 tlbie r4,r0
38: 7c 00 04 ac hwsync
3c: 38 60 00 00 li r3,0
40: 4e 80 00 20 blr

Before the patch it was:

30: 55 29 00 3c rlwinm r9,r9,0,0,30
34: 91 2a 00 00 stw r9,0(r10)
38: 94 21 ff f0 stwu r1,-16(r1)
3c: 7c 08 02 a6 mflr r0
40: 38 83 10 00 addi r4,r3,4096
44: 90 01 00 14 stw r0,20(r1)
48: 48 00 00 01 bl 48 <change_page_attr+0x48>
48: R_PPC_REL24 flush_tlb_kernel_range
4c: 80 01 00 14 lwz r0,20(r1)
50: 38 60 00 00 li r3,0
54: 7c 08 03 a6 mtlr r0
58: 38 21 00 10 addi r1,r1,16
5c: 4e 80 00 20 blr

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/d2610043419ce3e0e53a85386baf2c3625af5cfb.1647877442.git.christophe.leroy@csgroup.eu

powerpc/mm: Make slice specific to book3s/64

Since commit 555904d07eef ("powerpc/8xx: MM_SLICE is not needed
anymore") only book3s/64 selects CONFIG_PPC_MM_SLICES.

Move slice.c into mm/book3s64/

Move necessary stuff in asm/book3s/64/slice.h and
remove asm/slice.h

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/4a0d74ef1966a5902b5fd4ac4b513a760a6d675a.1649523076.git.christophe.leroy@csgroup.eu

powerpc/mm: Add __init attribute to eligible functions

Some functions defined in 'arch/powerpc/mm' are deserving of an
`__init` macro attribute. These functions are only called by other
initialization functions and therefore should inherit the attribute.
Also, change function declarations in header files to include `__init`.

Signed-off-by: Nick Child <nick.child@ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211216220035.605465-4-nick.child@ibm.com

powerpc/64e: remove mmu_linear_psize

mmu_linear_psize is only set at boot once on 64e, is not necessarily
the correct size of the linear map pages, and is never used anywhere.
Remove it.

Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Retain the extern, so we can use IS_ENABLED() for related code]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211201144153.2456614-14-npiggin@gmail.com

powerpc/book3e: Fix TLBCAM preset at boot

Commit 52bda69ae8b5 ("powerpc/fsl_booke: Tell map_mem_in_cams() if
init is done") was supposed to just add an additional parameter to
map_mem_in_cams() and always set it to 'true' at that time.

But a few call sites were messed up. Fix them.

Fixes: 52bda69ae8b5 ("powerpc/fsl_booke: Tell map_mem_in_cams() if init is done")
Reported-by: Christian Zigotzky <chzigotzky@xenosoft.de>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Tested-by: Christian Zigotzky <chzigotzky@xenosoft.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/d319f2a9367d4d08fd2154e506101bd5f100feeb.1636967119.git.christophe.leroy@csgroup.eu

powerpc/8xx: Simplify TLB handling

In the old days, TLB handling for 8xx was using tlbie and tlbia
instructions directly as much as possible.

But commit f048aace29e0 ("powerpc/mm: Add SMP support to no-hash
TLB handling") broke that by introducing out-of-line unnecessary
complex functions for booke/smp which don't have tlbie/tlbia
instructions and require more complex handling.

Restore direct use of tlbie and tlbia for 8xx which is never SMP.

With this patch we now get

c00ecc68 <ptep_clear_flush>:
c00ecc68: 39 00 00 00 li r8,0
c00ecc6c: 81 46 00 00 lwz r10,0(r6)
c00ecc70: 91 06 00 00 stw r8,0(r6)
c00ecc74: 7c 00 2a 64 tlbie r5,r0
c00ecc78: 7c 00 04 ac hwsync
c00ecc7c: 91 43 00 00 stw r10,0(r3)
c00ecc80: 4e 80 00 20 blr

Before it was

c0012880 <local_flush_tlb_page>:
c0012880: 2c 03 00 00 cmpwi r3,0
c0012884: 41 82 00 54 beq c00128d8 <local_flush_tlb_page+0x58>
c0012888: 81 22 00 00 lwz r9,0(r2)
c001288c: 81 43 00 20 lwz r10,32(r3)
c0012890: 39 29 00 01 addi r9,r9,1
c0012894: 91 22 00 00 stw r9,0(r2)
c0012898: 2c 0a 00 00 cmpwi r10,0
c001289c: 41 82 00 10 beq c00128ac <local_flush_tlb_page+0x2c>
c00128a0: 81 2a 01 dc lwz r9,476(r10)
c00128a4: 2c 09 ff ff cmpwi r9,-1
c00128a8: 41 82 00 0c beq c00128b4 <local_flush_tlb_page+0x34>
c00128ac: 7c 00 22 64 tlbie r4,r0
c00128b0: 7c 00 04 ac hwsync
c00128b4: 81 22 00 00 lwz r9,0(r2)
c00128b8: 39 29 ff ff addi r9,r9,-1
c00128bc: 2c 09 00 00 cmpwi r9,0
c00128c0: 91 22 00 00 stw r9,0(r2)
c00128c4: 4c a2 00 20 bclr+ 4,eq
c00128c8: 81 22 00 70 lwz r9,112(r2)
c00128cc: 71 29 00 04 andi. r9,r9,4
c00128d0: 4d 82 00 20 beqlr
c00128d4: 48 65 76 74 b c0669f48 <preempt_schedule>
c00128d8: 81 22 00 00 lwz r9,0(r2)
c00128dc: 39 29 00 01 addi r9,r9,1
c00128e0: 91 22 00 00 stw r9,0(r2)
c00128e4: 4b ff ff c8 b c00128ac <local_flush_tlb_page+0x2c>
...
c00ecdc8 <ptep_clear_flush>:
c00ecdc8: 94 21 ff f0 stwu r1,-16(r1)
c00ecdcc: 39 20 00 00 li r9,0
c00ecdd0: 93 c1 00 08 stw r30,8(r1)
c00ecdd4: 83 c6 00 00 lwz r30,0(r6)
c00ecdd8: 91 26 00 00 stw r9,0(r6)
c00ecddc: 93 e1 00 0c stw r31,12(r1)
c00ecde0: 7c 08 02 a6 mflr r0
c00ecde4: 7c 7f 1b 78 mr r31,r3
c00ecde8: 7c 83 23 78 mr r3,r4
c00ecdec: 7c a4 2b 78 mr r4,r5
c00ecdf0: 90 01 00 14 stw r0,20(r1)
c00ecdf4: 4b f2 5a 8d bl c0012880 <local_flush_tlb_page>
c00ecdf8: 93 df 00 00 stw r30,0(r31)
c00ecdfc: 7f e3 fb 78 mr r3,r31
c00ece00: 80 01 00 14 lwz r0,20(r1)
c00ece04: 83 c1 00 08 lwz r30,8(r1)
c00ece08: 83 e1 00 0c lwz r31,12(r1)
c00ece0c: 7c 08 03 a6 mtlr r0
c00ece10: 38 21 00 10 addi r1,r1,16
c00ece14: 4e 80 00 20 blr

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/fb324f1c8f2ddb57cf6aad1cea26329558f1c1c0.1631887021.git.christophe.leroy@csgroup.eu

powerpc/fsl_booke: Tell map_mem_in_cams() if init is done

In order to be able to call map_mem_in_cams() once more
after init for STRICT_KERNEL_RWX, add an argument.

For now, map_mem_in_cams() is always called only during init.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/3b69a7e0b393b16984ade882a5eae5d727717459.1634292136.git.christophe.leroy@csgroup.eu

powerpc/8xx: Support 16k hugepages with 4k pages

The 8xx has 4 page sizes: 4k, 16k, 512k and 8M

4k and 16k can be selected at build time as standard page sizes,
and 512k and 8M are hugepages.

When 4k standard pages are selected, 16k pages are not available.

Allow 16k pages as hugepages when 4k pages are used.

To allow that, implement arch_make_huge_pte() which receives
the necessary arguments to allow setting the PTE in accordance
with the page size:
- 512 k pages must have _PAGE_HUGE and _PAGE_SPS. They are set
by pte_mkhuge(). arch_make_huge_pte() does nothing.
- 16 k pages must have only _PAGE_SPS. arch_make_huge_pte() clears
_PAGE_HUGE.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/a518abc29266a708dfbccc8fce9ae6694fe4c2c6.1598862623.git.christophe.leroy@csgroup.eu

mm: remove unneeded includes of <asm/pgalloc.h>

Patch series "mm: cleanup usage of <asm/pgalloc.h>"

Most architectures have very similar versions of pXd_alloc_one() and
pXd_free_one() for intermediate levels of page table. These patches add
generic versions of these functions in <asm-generic/pgalloc.h> and enable
use of the generic functions where appropriate.

In addition, functions declared and defined in <asm/pgalloc.h> headers are
used mostly by core mm and early mm initialization in arch and there is no
actual reason to have the <asm/pgalloc.h> included all over the place.
The first patch in this series removes unneeded includes of
<asm/pgalloc.h>

In the end it didn't work out as neatly as I hoped and moving
pXd_alloc_track() definitions to <asm-generic/pgalloc.h> would require
unnecessary changes to arches that have custom page table allocations, so
I've decided to move lib/ioremap.c to mm/ and make pgalloc-track.h local
to mm/.

This patch (of 8):

In most cases <asm/pgalloc.h> header is required only for allocations of
page table memory. Most of the .c files that include that header do not
use symbols declared in <asm/pgalloc.h> and do not require that header.

As for the other header files that used to include <asm/pgalloc.h>, it is
possible to move that include into the .c file that actually uses symbols
from <asm/pgalloc.h> and drop the include from the header file.

The process was somewhat automated using

sed -i -E '/[<"]asm\/pgalloc\.h/d' \
$(grep -L -w -f /tmp/xx \
$(git grep -E -l '[<"]asm/pgalloc\.h'))

where /tmp/xx contains all the symbols defined in
arch/*/include/asm/pgalloc.h.

[rppt@linux.ibm.com: fix powerpc warning]

Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Pekka Enberg <penberg@kernel.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> [m68k]
Cc: Abdul Haleem <abdhalee@linux.vnet.ibm.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Arnd Bergmann <arnd@arndb.de>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Joerg Roedel <joro@8bytes.org>
Cc: Max Filippov <jcmvbkbc@gmail.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Satheesh Rajendran <sathnaga@linux.vnet.ibm.com>
Cc: Stafford Horne <shorne@gmail.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Joerg Roedel <jroedel@suse.de>
Cc: Matthew Wilcox <willy@infradead.org>
Link: http://lkml.kernel.org/r/20200627143453.31835-1-rppt@kernel.org
Link: http://lkml.kernel.org/r/20200627143453.31835-2-rppt@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

powerpc/mm: make ioremap_bot common to all

Drop multiple definitions of ioremap_bot and make one common to
all subarches.

Only CONFIG_PPC_BOOK3E_64 had a global static init value for
ioremap_bot. Now ioremap_bot is set in early_init_mmu_global().

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/920eebfd9f36f14c79d1755847f5bf7c83703bdd.1566309262.git.christophe.leroy@c-s.fr

powerpc/64e: Drop stale call to smp_processor_id() which hangs SMP startup

Commit ebb9d30a6a74 ("powerpc/mm: any thread in one core can be the
first to setup TLB1") removed the need to know the cpu_id in
early_init_this_mmu(), but the call to smp_processor_id() which was
marked __maybe_used remained.

Since commit ed1cd6deb013 ("powerpc: Activate CONFIG_THREAD_INFO_IN_TASK")
thread_info cannot be reached before MMU is properly set up.

Drop this stale call to smp_processor_id() which makes SMP hang when
CONFIG_PREEMPT is set.

Fixes: ebb9d30a6a74 ("powerpc/mm: any thread in one core can be the first to setup TLB1")
Fixes: ed1cd6deb013 ("powerpc: Activate CONFIG_THREAD_INFO_IN_TASK")
Cc: stable@vger.kernel.org # v5.1+
Reported-by: Chris Packham <Chris.Packham@alliedtelesis.co.nz>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Tested-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/bef479514f4c08329fa649f67735df8918bc0976.1565268248.git.christophe.leroy@c-s.fr

treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152

Based on 1 normalized pattern(s):

this program is free software you can redistribute it and or modify
it under the terms of the gnu general public license as published by
the free software foundation either version 2 of the license or at
your option any later version

extracted by the scancode license scanner the SPDX license identifier

GPL-2.0-or-later

has been chosen to replace the boilerplate/reference in 3029 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190527070032.746973796@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

powerpc/64: only book3s/64 supports CONFIG_PPC_64K_PAGES

CONFIG_PPC_64K_PAGES cannot be selected by nohash/64.

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

powerpc/mm: define subarch SLB_ADDR_LIMIT_DEFAULT

This patch defines a subarch specific SLB_ADDR_LIMIT_DEFAULT
to remove the #ifdefs around the setup of mm->context.slb_addr_limit

It also generalises the use of mm_ctx_set_slb_addr_limit() helper.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

powerpc/mm: Move nohash specifics in subdirectory mm/nohash

Many files in arch/powerpc/mm are only for nohash. This patch
creates a subdirectory for them.

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