linux-stable.git/arch/parisc/kernel, branch linux-6.5.y

parisc/pgtable: Do not drop upper 5 address bits of physical address

2023-11-28T17:15:10+00:00

commit 166b0110d1ee53290bd11618df6e3991c117495a upstream.

When calculating the pfn for the iitlbt/idtlbt instruction, do not
drop the upper 5 address bits. This doesn't seem to have an effect
on physical hardware which uses less physical address bits, but in
qemu the missing bits are visible.

Signed-off-by: Helge Deller 
Cc:  
Signed-off-by: Greg Kroah-Hartman

parisc: Prevent booting 64-bit kernels on PA1.x machines

2023-11-28T17:15:10+00:00

commit a406b8b424fa01f244c1aab02ba186258448c36b upstream.

Bail out early with error message when trying to boot a 64-bit kernel on
32-bit machines. This fixes the previous commit to include the check for
true 64-bit kernels as well.

Signed-off-by: Helge Deller 
Fixes: 591d2108f3abc ("parisc: Add runtime check to prevent PA2.0 kernels on PA1.x machines")
Cc:   # v6.0+
Signed-off-by: Greg Kroah-Hartman

parisc: Add nop instructions after TLB inserts

2023-11-28T17:15:02+00:00

commit ad4aa06e1d92b06ed56c7240252927bd60632efe upstream.

An excerpt from the PA8800 ERS states:

* The PA8800 violates the seven instruction pipeline rule when performing
  TLB inserts or PxTLBE instructions with the PSW C bit on. The instruction
  will take effect by the 12th instruction after the insert or purge.

I believe we have a problem with handling TLB misses. We don't fill
the pipeline following TLB inserts. As a result, we likely fault again
after returning from the interruption.

The above statement indicates that we need at least seven instructions
after the insert on pre PA8800 processors and we need 12 instructions
on PA8800/PA8900 processors.

Here we add macros and code to provide the required number instructions
after a TLB insert.

Signed-off-by: John David Anglin 
Suggested-by: Helge Deller 
Cc: stable@vger.kernel.org
Signed-off-by: Helge Deller 
Signed-off-by: Greg Kroah-Hartman

parisc: Fix crash with nr_cpus=1 option

2023-10-10T20:03:04+00:00

commit d3b3c637e4eb8d3bbe53e5692aee66add72f9851 upstream.

John David Anglin reported that giving "nr_cpus=1" on the command
line causes a crash, while "maxcpus=1" works.

Reported-by: John David Anglin 
Signed-off-by: Helge Deller 
Cc: stable@vger.kernel.org # v5.18+
Signed-off-by: Greg Kroah-Hartman

parisc: irq: Make irq_stack_union static to avoid sparse warning

2023-10-06T11:16:09+00:00

[ Upstream commit b1bef1388c427cdad7331a9c8eb4ebbbe5b954b0 ]

Signed-off-by: Helge Deller 
Signed-off-by: Sasha Levin

parisc: drivers: Fix sparse warning

2023-10-06T11:16:08+00:00

[ Upstream commit b137b9d60b8add5620a06c687a71ce18776730b0 ]

Fix "warning: directive in macro's argument list" warning.

Signed-off-by: Helge Deller 
Signed-off-by: Sasha Levin

parisc: Fix /proc/cpuinfo output for lscpu

2023-09-13T07:53:54+00:00

commit 9f5ba4b3e1b3c123eeca5d2d09161e8720048b5c upstream.

The lscpu command is broken since commit cab56b51ec0e ("parisc: Fix
device names in /proc/iomem") added the PA pathname to all PA
devices, includig the CPUs.

lscpu parses /proc/cpuinfo and now believes it found different CPU
types since every CPU is listed with an unique identifier (PA
pathname).

Fix this problem by simply dropping the PA pathname when listing the
CPUs in /proc/cpuinfo. There is no need to show the pathname in this
procfs file.

Fixes: cab56b51ec0e ("parisc: Fix device names in /proc/iomem")
Signed-off-by: Helge Deller 
Cc:  # v4.9+
Signed-off-by: Greg Kroah-Hartman

parisc: Fix CONFIG_TLB_PTLOCK to work with lightweight spinlock checks

2023-08-14T07:54:49+00:00

For the TLB_PTLOCK checks we used an optimization to store the spc
register into the spinlock to unlock it. This optimization works as
long as the lightweight spinlock checks (CONFIG_LIGHTWEIGHT_SPINLOCK_CHECK)
aren't enabled, because they really check if the lock word is zero or
__ARCH_SPIN_LOCK_UNLOCKED_VAL and abort with a kernel crash
("Spinlock was trashed") otherwise.

Drop that optimization to make it possible to activate both checks
at the same time.

Noticed-by: Sam James 
Signed-off-by: Helge Deller 
Tested-by: Sam James 
Cc: stable@vger.kernel.org # v6.4+
Fixes: 15e64ef6520e ("parisc: Add lightweight spinlock checks")

Merge tag 'io_uring-6.5-2023-08-11' of git://git.kernel.dk/linux

2023-08-11T19:06:51+00:00

Pull io_uring fixes from Jens Axboe:
 "A followup fix for the parisc/SHM_COLOUR fix, also from Helge, which
  is heading to stable.

  And then just the io_uring equivalent of the RESOLVE_CACHED fix in
  commit a0fc452a5d7f from last week for build_open_flags()"

* tag 'io_uring-6.5-2023-08-11' of git://git.kernel.dk/linux:
  io_uring/parisc: Adjust pgoff in io_uring mmap() for parisc
  io_uring: correct check for O_TMPFILE

parisc: perf: Make cpu_device variable static

2023-08-10T21:00:18+00:00

Signed-off-by: Helge Deller