linux-stable.git/arch/parisc/kernel/firmware.c, branch linux-6.3.y

parisc: Replace regular spinlock with spin_trylock on panic path

2023-05-24T16:30:12+00:00

[ Upstream commit 829632dae8321787525ee37dc4828bbe6edafdae ]

The panic notifiers' callbacks execute in an atomic context, with
interrupts/preemption disabled, and all CPUs not running the panic
function are off, so it's very dangerous to wait on a regular
spinlock, there's a risk of deadlock.

Refactor the panic notifier of parisc/power driver to make use
of spin_trylock - for that, we've added a second version of the
soft-power function. Also, some comments were reorganized and
trailing white spaces, useless header inclusion and blank lines
were removed.

Cc: "James E.J. Bottomley" 
Cc: Jeroen Roovers 
Acked-by: Helge Deller  # parisc
Signed-off-by: Guilherme G. Piccoli 
Signed-off-by: Helge Deller 
Signed-off-by: Sasha Levin

parisc: Fix return code of pdc_iodc_print()

2023-01-09T08:51:56+00:00

There is an off-by-one if the printed string includes a new-line
char.

Cc: stable@vger.kernel.org
Signed-off-by: Helge Deller

parisc: Show MPE/iX model string at bootup

2022-12-19T15:08:52+00:00

Some (mostly 64-bit machines) machines allow to run MPE/iX and report the MPE
model string via firmware call. Enhance the pdc_model_sysmodel() function to
report that model string.
Note that some 32-bit machines like the B160L wrongly report success for the
firmware call, so include a check to prevent showing wrong info.

Signed-off-by: Helge Deller

parisc: Move pdc_result struct to firmware.c

2022-12-18T21:18:49+00:00

Signed-off-by: Helge Deller

parisc: Fix locking in pdc_iodc_print() firmware call

2022-12-18T21:18:49+00:00

Utilize pdc_lock spinlock to protect parallel modifications of the
iodc_dbuf[] buffer, check length to prevent buffer overflow of
iodc_dbuf[], drop the iodc_retbuf[] buffer and fix some wrong
indentings.

Signed-off-by: Helge Deller 
Cc:  # 6.0+

parisc: Add PDC locking functions for rendezvous code

2022-03-29T19:37:12+00:00

Add pdc_cpu_rendezvous_lock() and pdc_cpu_rendezvous_unlock()
to lock PDC while CPU is transitioning into rendezvous state.
This is needed, because the transition phase may take up to 8 seconds.

Add pdc_pat_get_PDC_entrypoint() to get PDC entry point for current CPU.

Signed-off-by: Helge Deller

parisc: Ensure set_firmware_width() is called only once

2022-03-29T19:37:12+00:00

Call set_firmware_width() only once at runtime.
This prevents that hotplugged CPUs will get stuck in spinlocks later on.

Signed-off-by: Helge Deller

parisc/firmware: add functions to retrieve TOC data

2021-11-01T06:35:59+00:00

Add functions to retrieve TOC data from firmware both
for 1.1 and 2.0 PDC.

Signed-off-by: Sven Schnelle 
Signed-off-by: Helge Deller

isystem: ship and use stdarg.h

2021-08-19T00:02:55+00:00

Ship minimal stdarg.h (1 type, 4 macros) as .
stdarg.h is the only userspace header commonly used in the kernel.

GPL 2 version of  can be extracted from
http://archive.debian.org/debian/pool/main/g/gcc-4.2/gcc-4.2_4.2.4.orig.tar.gz

Signed-off-by: Alexey Dobriyan 
Acked-by: Rafael J. Wysocki 
Acked-by: Ard Biesheuvel 
Signed-off-by: Masahiro Yamada

parisc: firmware: Update references to parisc website

2020-06-01T21:02:11+00:00

The PA-RISC Linux project web page is now hosted at
https://parisc.wiki.kernel.org

Signed-off-by: Helge Deller