linux.git/arch/powerpc/platforms/pseries, branch v6.2

Merge tag 'powerpc-6.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux

2022-12-19T13:13:33+00:00

Pull powerpc updates from Michael Ellerman:

 - Add powerpc qspinlock implementation optimised for large system
   scalability and paravirt. See the merge message for more details

 - Enable objtool to be built on powerpc to generate mcount locations

 - Use a temporary mm for code patching with the Radix MMU, so the
   writable mapping is restricted to the patching CPU

 - Add an option to build the 64-bit big-endian kernel with the ELFv2
   ABI

 - Sanitise user registers on interrupt entry on 64-bit Book3S

 - Many other small features and fixes

Thanks to Aboorva Devarajan, Angel Iglesias, Benjamin Gray, Bjorn
Helgaas, Bo Liu, Chen Lifu, Christoph Hellwig, Christophe JAILLET,
Christophe Leroy, Christopher M. Riedl, Colin Ian King, Deming Wang,
Disha Goel, Dmitry Torokhov, Finn Thain, Geert Uytterhoeven, Gustavo A.
R. Silva, Haowen Bai, Joel Stanley, Jordan Niethe, Julia Lawall, Kajol
Jain, Laurent Dufour, Li zeming, Miaoqian Lin, Michael Jeanson, Nathan
Lynch, Naveen N. Rao, Nayna Jain, Nicholas Miehlbradt, Nicholas Piggin,
Pali Rohár, Randy Dunlap, Rohan McLure, Russell Currey, Sathvika
Vasireddy, Shaomin Deng, Stephen Kitt, Stephen Rothwell, Thomas
Weißschuh, Tiezhu Yang, Uwe Kleine-König, Xie Shaowen, Xiu Jianfeng,
XueBing Chen, Yang Yingliang, Zhang Jiaming, ruanjinjie, Jessica Yu,
and Wolfram Sang.

* tag 'powerpc-6.2-1' of git://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux: (181 commits)
  powerpc/code-patching: Fix oops with DEBUG_VM enabled
  powerpc/qspinlock: Fix 32-bit build
  powerpc/prom: Fix 32-bit build
  powerpc/rtas: mandate RTAS syscall filtering
  powerpc/rtas: define pr_fmt and convert printk call sites
  powerpc/rtas: clean up includes
  powerpc/rtas: clean up rtas_error_log_max initialization
  powerpc/pseries/eeh: use correct API for error log size
  powerpc/rtas: avoid scheduling in rtas_os_term()
  powerpc/rtas: avoid device tree lookups in rtas_os_term()
  powerpc/rtasd: use correct OF API for event scan rate
  powerpc/rtas: document rtas_call()
  powerpc/pseries: unregister VPA when hot unplugging a CPU
  powerpc/pseries: reset the RCU watchdogs after a LPM
  powerpc: Take in account addition CPU node when building kexec FDT
  powerpc: export the CPU node count
  powerpc/cpuidle: Set CPUIDLE_FLAG_POLLING for snooze state
  powerpc/dts/fsl: Fix pca954x i2c-mux node names
  cxl: Remove unnecessary cxl_pci_window_alignment()
  selftests/powerpc: Fix resource leaks
  ...

powerpc/pseries/eeh: use correct API for error log size

2022-12-07T11:39:50+00:00

rtas-error-log-max is not the name of an RTAS function, so rtas_token()
is not the appropriate API for retrieving its value. We already have
rtas_get_error_log_max() which returns a sensible value if the property
is absent for any reason, so use that instead.

Fixes: 8d633291b4fc ("powerpc/eeh: pseries platform EEH error log retrieval")
Signed-off-by: Nathan Lynch 
[mpe: Drop no-longer possible error handling as noticed by ajd]
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20221118150751.469393-6-nathanl@linux.ibm.com

powerpc/pseries: unregister VPA when hot unplugging a CPU

2022-12-07T09:30:23+00:00

The VPA should unregister when offlining a CPU. Otherwise there could be
a short window where 2 CPUs could share the same VPA.

This happens because the hypervisor is still keeping the VPA attached to
the vCPU even if it became offline.

Here is a potential situation:
 1. remove proc A,
 2. add proc B. If proc B gets proc A's place in cpu_present_mask, then
    it registers proc A's VPAs.
 3. If proc B is then re-added to the LP, its threads are sharing VPAs
    with proc A briefly as they come online.

As the hypervisor may check for the VPA's yield_count field oddity, it
may detect an unexpected value and kill the LPAR.

Suggested-by: Nathan Lynch 
Signed-off-by: Laurent Dufour 
Reviewed-by: Nathan Lynch 
[mpe: s/cpu_present_map/cpu_present_mask/ in change log]
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20221114160150.13554-1-ldufour@linux.ibm.com

powerpc/pseries: reset the RCU watchdogs after a LPM

2022-12-07T09:30:09+00:00

The RCU watchdog timer should be reset when restarting the CPU after a
Live Partition Mobility operation.

Signed-off-by: Laurent Dufour 
Acked-by: Nicholas Piggin 
[mpe: Combine comments into a single comment block]
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20221125173204.15329-1-ldufour@linux.ibm.com

powerpc/pseries: hvcall stack frame overhead

2022-12-02T06:54:07+00:00

This call may use the min size stack frame. The scratch space used is
in the caller's parameter area frame, not this function's frame.

Signed-off-by: Nicholas Piggin 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20221127124942.1665522-6-npiggin@gmail.com

Merge branch 'fixes' into next

2022-11-30T10:46:06+00:00

Merge our fixes branch to bring in some changes that are prerequisites
for work in next.

powerpc/pseries: fix plpks_read_var() code for different consumers

2022-11-24T12:31:50+00:00

Even though plpks_read_var() is currently called to read variables
owned by different consumers, it internally supports only OS consumer.

Fix plpks_read_var() to handle different consumers correctly.

Fixes: 2454a7af0f2a ("powerpc/pseries: define driver for Platform KeyStore")
Signed-off-by: Nayna Jain 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20221106205839.600442-7-nayna@linux.ibm.com

powerpc/pseries: replace kmalloc with kzalloc in PLPKS driver

2022-11-24T12:31:50+00:00

Replace kmalloc with kzalloc in construct_auth() function to default
initialize structure with zeroes.

Signed-off-by: Nayna Jain 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20221106205839.600442-6-nayna@linux.ibm.com

powerpc/pseries: cleanup error logs in plpks driver

2022-11-24T12:31:50+00:00

Logging H_CALL return codes in PLPKS driver are easy to confuse with
Linux error codes.

Let the caller of the function log the converted linux error code.

Signed-off-by: Nayna Jain 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20221106205839.600442-5-nayna@linux.ibm.com

powerpc/pseries: Return -EIO instead of -EINTR for H_ABORTED error

2022-11-24T12:31:50+00:00

Some commands for eg. "cat" might continue to retry on encountering
EINTR. This is not expected for original error code H_ABORTED.

Map H_ABORTED to more relevant Linux error code EIO.

Fixes: 2454a7af0f2a ("powerpc/pseries: define driver for Platform KeyStore")
Signed-off-by: Nayna Jain 
Signed-off-by: Michael Ellerman 
Link: https://lore.kernel.org/r/20221106205839.600442-4-nayna@linux.ibm.com