linux.git/arch/powerpc/kernel/prom.c, branch v6.2

powerpc/prom: Fix 32-bit build

2022-12-07T22:43:15+00:00

Add an IS_ENABLED() check to fix the build error:

arch/powerpc/kernel/prom.o: in function `early_init_dt_scan_cpus':
  prom.c:(.init.text+0x2ea): undefined reference to `boot_cpu_node_count'

Fixes: e13d23a404f2 ("powerpc: export the CPU node count")
Signed-off-by: Michael Ellerman

powerpc: export the CPU node count

2022-12-07T09:14:49+00:00

At boot time, the FDT is parsed to compute the number of CPUs.
In addition count the number of CPU nodes and export it.

This is useful when building the FDT for a kexeced kernel since we need to
take in account the CPU node added since the boot time during CPU hotplug
operations.

Signed-off-by: Laurent Dufour 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20221110180619.15796-2-ldufour@linux.ibm.com

powerpc: Add device-tree model to the hardware description

2022-09-30T08:35:53+00:00

Add the model of the machine we're on to the hardware description, which
is printed at boot and in case of an oops.

eg: Hardware name: IBM,8247-22L

Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20220930082709.55830-4-mpe@ellerman.id.au

powerpc/64: Add logical PVR to the hardware description

2022-09-30T08:35:53+00:00

If we detect a logical PVR add that to the hardware description, which
is printed at boot and in case of an oops.

eg: Hardware name: ... 0xf000004

Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20220930082709.55830-3-mpe@ellerman.id.au

powerpc: Add PVR & CPU name to hardware description

2022-09-30T08:35:52+00:00

Add the PVR and CPU name to the hardware description, which is printed
at boot and in case of an oops.

eg: Hardware name: ... POWER8E (raw) 0x4b0201

Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20220930082709.55830-2-mpe@ellerman.id.au

powerpc: Ignore DSI error caused by the copy/paste instruction

2022-09-28T12:52:32+00:00

The data storage interrupt (DSI) error will be generated when the
paste operation is issued on the suspended Nest Accelerator (NX)
window due to NX state changes. The hypervisor expects the
partition to ignore this error during page fault handling.
To differentiate DSI caused by an actual HW configuration or by
the NX window, a new “ibm,pi-features” type value is defined.
Byte 0, bit 3 of pi-attribute-specifier-type is now defined to
indicate this DSI error. If this error is not ignored, the user
space can get SIGBUS when the NX request is issued.

This patch adds changes to read ibm,pi-features property and ignore
DSI error during page fault handling if MMU_FTR_NX_DSI is defined.

Signed-off-by: Haren Myneni 
[mpe: Mention PAPR version in comment]
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/b9cd844b85eb8f70459109ce1b14e44c4cc85fa7.camel@linux.ibm.com

powerpc/64: Init jump labels before parse_early_param()

2022-08-01T12:21:19+00:00

On 64-bit, calling jump_label_init() in setup_feature_keys() is too
late because static keys may be used in subroutines of
parse_early_param() which is again subroutine of early_init_devtree().

For example booting with "threadirqs":

  static_key_enable_cpuslocked(): static key '0xc000000002953260' used before call to jump_label_init()
  WARNING: CPU: 0 PID: 0 at kernel/jump_label.c:166 static_key_enable_cpuslocked+0xfc/0x120
  ...
  NIP static_key_enable_cpuslocked+0xfc/0x120
  LR  static_key_enable_cpuslocked+0xf8/0x120
  Call Trace:
    static_key_enable_cpuslocked+0xf8/0x120 (unreliable)
    static_key_enable+0x30/0x50
    setup_forced_irqthreads+0x28/0x40
    do_early_param+0xa0/0x108
    parse_args+0x290/0x4e0
    parse_early_options+0x48/0x5c
    parse_early_param+0x58/0x84
    early_init_devtree+0xd4/0x518
    early_setup+0xb4/0x214

So call jump_label_init() just before parse_early_param() in
early_init_devtree().

Suggested-by: Michael Ellerman 
Signed-off-by: Zhouyi Zhou 
[mpe: Add call trace to change log and minor wording edits.]
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20220726015747.11754-1-zhouzhouyi@gmail.com

powerpc: Remove asm/prom.h from asm/mpc52xx.h and asm/pci.h

2022-07-28T06:22:12+00:00

asm/pci.h and asm/mpc52xx.h don't need asm/prom.h

Declare struct device_node locally to avoid including of.h

Signed-off-by: Christophe Leroy 
[mpe: Add missing include of prom.h to of_rtc.c]
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/cf5243343e2364c2b40f22ee5ad9a6e2453d1121.1657264228.git.christophe.leroy@csgroup.eu

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: Remove asm/prom.h from all files that don't need it

2022-05-08T12:15:04+00:00

Several files include asm/prom.h for no reason.

Clean it up.

Signed-off-by: Christophe Leroy 
[mpe: Drop change to prom_parse.c as reported by lkp@intel.com]
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/7c9b8fda63dcf63e1b28f43e7ebdb95182cbc286.1646767214.git.christophe.leroy@csgroup.eu