linux.git/arch/powerpc/kernel/setup_32.c, branch v5.10

powerpc: Remove support for PowerPC 601

2020-10-08T10:17:13+00:00

PowerPC 601 has been retired.

Remove all associated specific code.

CPU_FTRS_PPC601 has CPU_FTR_COHERENT_ICACHE and CPU_FTR_COMMON.

CPU_FTR_COMMON is already present via other CPU_FTRS.
None of the remaining CPU selects CPU_FTR_COHERENT_ICACHE.

So CPU_FTRS_PPC601 can be removed from the possible features,
hence can be removed completely.

Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/60b725d55e21beec3335175c20b77903ff98284f.1601362098.git.christophe.leroy@csgroup.eu

mm: reorder includes after introduction of linux/pgtable.h

2020-06-09T16:39:13+00:00

The replacement of  with  made the include
of the latter in the middle of asm includes.  Fix this up with the aid of
the below script and manual adjustments here and there.

	import sys
	import re

	if len(sys.argv) is not 3:
	    print "USAGE: %s  " % (sys.argv[0])
	    sys.exit(1)

	hdr_to_move="#include " % sys.argv[2]
	moved = False
	in_hdrs = False

	with open(sys.argv[1], "r") as f:
	    lines = f.readlines()
	    for _line in lines:
		line = _line.rstrip('
')
		if line == hdr_to_move:
		    continue
		if line.startswith("#include 
Signed-off-by: Andrew Morton 
Cc: Arnd Bergmann 
Cc: Borislav Petkov 
Cc: Brian Cain 
Cc: Catalin Marinas 
Cc: Chris Zankel 
Cc: "David S. Miller" 
Cc: Geert Uytterhoeven 
Cc: Greentime Hu 
Cc: Greg Ungerer 
Cc: Guan Xuetao 
Cc: Guo Ren 
Cc: Heiko Carstens 
Cc: Helge Deller 
Cc: Ingo Molnar 
Cc: Ley Foon Tan 
Cc: Mark Salter 
Cc: Matthew Wilcox 
Cc: Matt Turner 
Cc: Max Filippov 
Cc: Michael Ellerman 
Cc: Michal Simek 
Cc: Nick Hu 
Cc: Paul Walmsley 
Cc: Richard Weinberger 
Cc: Rich Felker 
Cc: Russell King 
Cc: Stafford Horne 
Cc: Thomas Bogendoerfer 
Cc: Thomas Gleixner 
Cc: Tony Luck 
Cc: Vincent Chen 
Cc: Vineet Gupta 
Cc: Will Deacon 
Cc: Yoshinori Sato 
Link: http://lkml.kernel.org/r/20200514170327.31389-4-rppt@kernel.org
Signed-off-by: Linus Torvalds

mm: introduce include/linux/pgtable.h

2020-06-09T16:39:13+00:00

The include/linux/pgtable.h is going to be the home of generic page table
manipulation functions.

Start with moving asm-generic/pgtable.h to include/linux/pgtable.h and
make the latter include asm/pgtable.h.

Signed-off-by: Mike Rapoport 
Signed-off-by: Andrew Morton 
Cc: Arnd Bergmann 
Cc: Borislav Petkov 
Cc: Brian Cain 
Cc: Catalin Marinas 
Cc: Chris Zankel 
Cc: "David S. Miller" 
Cc: Geert Uytterhoeven 
Cc: Greentime Hu 
Cc: Greg Ungerer 
Cc: Guan Xuetao 
Cc: Guo Ren 
Cc: Heiko Carstens 
Cc: Helge Deller 
Cc: Ingo Molnar 
Cc: Ley Foon Tan 
Cc: Mark Salter 
Cc: Matthew Wilcox 
Cc: Matt Turner 
Cc: Max Filippov 
Cc: Michael Ellerman 
Cc: Michal Simek 
Cc: Nick Hu 
Cc: Paul Walmsley 
Cc: Richard Weinberger 
Cc: Rich Felker 
Cc: Russell King 
Cc: Stafford Horne 
Cc: Thomas Bogendoerfer 
Cc: Thomas Gleixner 
Cc: Tony Luck 
Cc: Vincent Chen 
Cc: Vineet Gupta 
Cc: Will Deacon 
Cc: Yoshinori Sato 
Link: http://lkml.kernel.org/r/20200514170327.31389-3-rppt@kernel.org
Signed-off-by: Linus Torvalds

powerpc/mm: Allocate static page tables for fixmap

2020-05-26T12:22:19+00:00

Allocate static page tables for the fixmap area. This allows
setting mappings through page tables before memblock is ready.
That's needed to use early_ioremap() early and to use standard
page mappings with fixmap.

Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/4f4b1412d34de6801b8e925cb88fc69d056ff536.1589866984.git.christophe.leroy@csgroup.eu

powerpc: Use a datatype for instructions

2020-05-18T14:10:37+00:00

Currently unsigned ints are used to represent instructions on powerpc.
This has worked well as instructions have always been 4 byte words.

However, ISA v3.1 introduces some changes to instructions that mean
this scheme will no longer work as well. This change is Prefixed
Instructions. A prefixed instruction is made up of a word prefix
followed by a word suffix to make an 8 byte double word instruction.
No matter the endianness of the system the prefix always comes first.
Prefixed instructions are only planned for powerpc64.

Introduce a ppc_inst type to represent both prefixed and word
instructions on powerpc64 while keeping it possible to exclusively
have word instructions on powerpc32.

Signed-off-by: Jordan Niethe 
[mpe: Fix compile error in emulate_spe()]
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20200506034050.24806-12-jniethe5@gmail.com

powerpc: Use a macro for creating instructions from u32s

2020-05-18T14:10:36+00:00

In preparation for instructions having a more complex data type start
using a macro, ppc_inst(), for making an instruction out of a u32.  A
macro is used so that instructions can be used as initializer elements.
Currently this does nothing, but it will allow for creating a data type
that can represent prefixed instructions.

Signed-off-by: Jordan Niethe 
[mpe: Change include guard to _ASM_POWERPC_INST_H]
Signed-off-by: Michael Ellerman 
Reviewed-by: Alistair Popple 
Link: https://lore.kernel.org/r/20200506034050.24806-7-jniethe5@gmail.com

powerpc: Change calling convention for create_branch() et. al.

2020-05-18T14:10:36+00:00

create_branch(), create_cond_branch() and translate_branch() return the
instruction that they create, or return 0 to signal an error. Separate
these concerns in preparation for an instruction type that is not just
an unsigned int.  Fill the created instruction to a pointer passed as
the first parameter to the function and use a non-zero return value to
signify an error.

Signed-off-by: Jordan Niethe 
Signed-off-by: Michael Ellerman 
Reviewed-by: Alistair Popple 
Link: https://lore.kernel.org/r/20200506034050.24806-6-jniethe5@gmail.com

powerpc/32: drop unused ISA_DMA_THRESHOLD

2020-04-01T03:30:50+00:00

The ISA_DMA_THRESHOLD variable is set by several platforms but never
referenced.
Remove it.

Signed-off-by: Mike Rapoport 
Reviewed-by: Christoph Hellwig 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20191125092033.20014-1-rppt@kernel.org

powerpc/32: Use vmapped stacks for interrupts

2020-01-27T11:36:15+00:00

In order to also catch overflows on IRQ stacks, use vmapped stacks.

Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/d33ad1b36ddff4dcc19f96c592c12a61cf85d406.1576916812.git.christophe.leroy@c-s.fr

powerpc/32: Add early stack overflow detection with VMAP stack.

2020-01-27T11:35:49+00:00

To avoid recursive faults, stack overflow detection has to be
performed before writing in the stack in exception prologs.

Do it by checking the alignment. If the stack pointer alignment is
wrong, it means it is pointing to the following or preceding page.

Without VMAP stack, a stack overflow is catastrophic. With VMAP
stack, a stack overflow isn't destructive, so don't panic. Kill
the task with SIGSEGV instead.

A dedicated overflow stack is set up for each CPU.

  lkdtm: Performing direct entry EXHAUST_STACK
  lkdtm: Calling function with 512 frame size to depth 32 ...
  lkdtm: loop 32/32 ...
  lkdtm: loop 31/32 ...
  lkdtm: loop 30/32 ...
  lkdtm: loop 29/32 ...
  lkdtm: loop 28/32 ...
  lkdtm: loop 27/32 ...
  lkdtm: loop 26/32 ...
  lkdtm: loop 25/32 ...
  lkdtm: loop 24/32 ...
  lkdtm: loop 23/32 ...
  lkdtm: loop 22/32 ...
  lkdtm: loop 21/32 ...
  lkdtm: loop 20/32 ...
  Kernel stack overflow in process test[359], r1=c900c008
  Oops: Kernel stack overflow, sig: 6 [#1]
  BE PAGE_SIZE=4K MMU=Hash PowerMac
  Modules linked in:
  CPU: 0 PID: 359 Comm: test Not tainted 5.3.0-rc7+ #2225
  NIP:  c0622060 LR: c0626710 CTR: 00000000
  REGS: c0895f48 TRAP: 0000   Not tainted  (5.3.0-rc7+)
  MSR:  00001032   CR: 28004224  XER: 00000000
  GPR00: c0626ca4 c900c008 c783c000 c07335cc c900c010 c07335cc c900c0f0 c07335cc
  GPR08: c900c0f0 00000001 00000000 00000000 28008222 00000000 00000000 00000000
  GPR16: 00000000 00000000 10010128 10010000 b799c245 10010158 c07335cc 00000025
  GPR24: c0690000 c08b91d4 c068f688 00000020 c900c0f0 c068f668 c08b95b4 c08b91d4
  NIP [c0622060] format_decode+0x0/0x4d4
  LR [c0626710] vsnprintf+0x80/0x5fc
  Call Trace:
  [c900c068] [c0626ca4] vscnprintf+0x18/0x48
  [c900c078] [c007b944] vprintk_store+0x40/0x214
  [c900c0b8] [c007bf50] vprintk_emit+0x90/0x1dc
  [c900c0e8] [c007c5cc] printk+0x50/0x60
  [c900c128] [c03da5b0] recursive_loop+0x44/0x6c
  [c900c338] [c03da5c4] recursive_loop+0x58/0x6c
  [c900c548] [c03da5c4] recursive_loop+0x58/0x6c
  [c900c758] [c03da5c4] recursive_loop+0x58/0x6c
  [c900c968] [c03da5c4] recursive_loop+0x58/0x6c
  [c900cb78] [c03da5c4] recursive_loop+0x58/0x6c
  [c900cd88] [c03da5c4] recursive_loop+0x58/0x6c
  [c900cf98] [c03da5c4] recursive_loop+0x58/0x6c
  [c900d1a8] [c03da5c4] recursive_loop+0x58/0x6c
  [c900d3b8] [c03da5c4] recursive_loop+0x58/0x6c
  [c900d5c8] [c03da5c4] recursive_loop+0x58/0x6c
  [c900d7d8] [c03da5c4] recursive_loop+0x58/0x6c
  [c900d9e8] [c03da5c4] recursive_loop+0x58/0x6c
  [c900dbf8] [c03da5c4] recursive_loop+0x58/0x6c
  [c900de08] [c03da67c] lkdtm_EXHAUST_STACK+0x30/0x4c
  [c900de18] [c03da3e8] direct_entry+0xc8/0x140
  [c900de48] [c029fb40] full_proxy_write+0x64/0xcc
  [c900de68] [c01500f8] __vfs_write+0x30/0x1d0
  [c900dee8] [c0152cb8] vfs_write+0xb8/0x1d4
  [c900df08] [c0152f7c] ksys_write+0x58/0xe8
  [c900df38] [c0014208] ret_from_syscall+0x0/0x34
  --- interrupt: c01 at 0xf806664
      LR = 0x1000c868
  Instruction dump:
  4bffff91 80010014 7c832378 7c0803a6 38210010 4e800020 3d20c08a 3ca0c089
  8089a0cc 38a58f0c 38600001 4ba2d494 <9421ffe0> 7c0802a6 bfc10018 7c9f2378

Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/1b89c121b4070c7ee99e4f22cc178f15a736b07b.1576916812.git.christophe.leroy@c-s.fr