linux.git/arch/powerpc/kernel/prom_init.c, branch v6.10

powerpc/mm: Align memory_limit value specified using mem= kernel parameter

2024-04-19T06:09:14+00:00

The value specified for the memory limit is used to set a restriction on
memory usage. It is important to ensure that this restriction is within
the linear map kernel address space range. The hash page table
translation uses a 16MB page size to map the kernel linear map address
space. htab_bolt_mapping() function aligns down the size of the range
while mapping kernel linear address space. Since the memblock limit is
enforced very early during boot, before we can detect the type of memory
translation (radix vs hash), we align the memory limit value specified
as a kernel parameter to 16MB. This alignment value will work for both
hash and radix translations.

Signed-off-by: Aneesh Kumar K.V (IBM) 
Acked-by: Joel Savitz 
Signed-off-by: Michael Ellerman 
Link: https://msgid.link/20240403083611.172833-1-aneesh.kumar@kernel.org

powerpc: Add Power11 architected and raw mode

2024-02-21T12:11:00+00:00

Add CPU table entries for raw and architected mode. Most fields are
copied from the Power10 table entries.

CPU, MMU and user (ELF_HWCAP) features are unchanged vs P10. However
userspace can detect P11 because the AT_PLATFORM value changes to
"power11".

The logical PVR value of 0x0F000007, passed to firmware via the
ibm_arch_vec, indicates the kernel can support a P11 compatible CPU,
which means at least ISA v3.1 compliant.

Signed-off-by: Madhavan Srinivasan 
Signed-off-by: Michael Ellerman 
Link: https://msgid.link/20240221044623.1598642-1-mpe@ellerman.id.au

powerpc: Annotate endianness of various variables and functions

2023-10-19T06:12:47+00:00

Sparse reports several endianness warnings on variables and functions
that are consistently treated as big endian. There are no
multi-endianness shenanigans going on here so fix these low hanging
fruit up in one patch.

All changes are just type annotations; no endianness switching
operations are introduced by this patch.

Signed-off-by: Benjamin Gray 
Signed-off-by: Michael Ellerman 
Link: https://msgid.link/20231011053711.93427-7-bgray@linux.ibm.com

powerpc/prom_init: drop PROM_BUG()

2022-09-26T10:58:18+00:00

Unused, let's drop it.

Signed-off-by: David Hildenbrand 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20220920122302.99195-3-david@redhat.com

Merge branch 'fixes' into next

2022-07-09T09:29:34+00:00

Merge our fixes branch. In particular this brings in commit
986481618023 ("powerpc/book3e: Fix PUD allocation size in
map_kernel_page()") which fixes a build failure in next, because commit
2db2008e6363 ("powerpc/64e: Rewrite p4d_populate() as a static inline
function") depends on it.

powerpc: Don't include asm/setup.h in asm/machdep.h

2022-06-20T01:29:49+00:00

asm/machdep.h doesn't need asm/setup.h

Remove it.

Add it directly in files that needs it.

Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/3b1dfb19a2c3265fb4abc2bfc7b6eae9261a998b.1654966508.git.christophe.leroy@csgroup.eu

powerpc/prom_init: Fix build failure with GCC_PLUGIN_STRUCTLEAK_BYREF_ALL and KASAN

2022-06-19T11:57:56+00:00

When CONFIG_KASAN is selected, we expect prom_init to use __memset()
because it is too early to use memset().

But with CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL, the compiler adds calls
to memset() to clear objects on stack, hence the following failure:

	  PROMCHK arch/powerpc/kernel/prom_init_check
	Error: External symbol 'memset' referenced from prom_init.c
	make[2]: *** [arch/powerpc/kernel/Makefile:204 : arch/powerpc/kernel/prom_init_check] Erreur 1

prom_find_machine_type() is called from prom_init() and is called only
once, so lets put compat[] in BSS instead of stack to avoid that.

Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/3802811f7cf94f730be44688539c01bba3a3b5c0.1654875808.git.christophe.leroy@csgroup.eu

powerpc: Add missing headers

2022-05-08T12:15:40+00:00

Don't inherit headers "by chances" from asm/prom.h, asm/mpc52xx.h,
asm/pci.h etc...

Include the needed headers, and remove asm/prom.h when it was
needed exclusively for pulling necessary headers.

Signed-off-by: Christophe Leroy 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/be8bdc934d152a7d8ee8d1a840d5596e2f7d85e0.1646767214.git.christophe.leroy@csgroup.eu

powerpc: fix typos in comments

2022-05-05T12:12:44+00:00

Various spelling mistakes in comments.
Detected with the help of Coccinelle.

Signed-off-by: Julia Lawall 
Reviewed-by: Joel Stanley 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20220430185654.5855-1-Julia.Lawall@inria.fr

powerpc/kernel: Add __init attribute to eligible functions

2021-12-23T11:33:10+00:00

Some functions defined in `arch/powerpc/kernel` (and one in `arch/powerpc/
kexec`) 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 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20211216220035.605465-2-nick.child@ibm.com