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[pull] master from torvalds:master #192

Merged
merged 15 commits into from
Sep 8, 2020
Merged

[pull] master from torvalds:master #192

merged 15 commits into from
Sep 8, 2020

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Cypresslin and others added 15 commits August 20, 2020 15:49
The following 4 tests in timers can take longer than the default 45
seconds that added in commit 852c8cb ("selftests/kselftest/runner.sh:
Add 45 second timeout per test") to run:
  * nsleep-lat - 2m7.350s
  * set-timer-lat - 2m0.66s
  * inconsistency-check - 1m45.074s
  * raw_skew - 2m0.013s

Thus they will be marked as failed with the current 45s setting:
  not ok 3 selftests: timers: nsleep-lat # TIMEOUT
  not ok 4 selftests: timers: set-timer-lat # TIMEOUT
  not ok 6 selftests: timers: inconsistency-check # TIMEOUT
  not ok 7 selftests: timers: raw_skew # TIMEOUT

Disable the timeout setting for timers can make these tests finish
properly:
  ok 3 selftests: timers: nsleep-lat
  ok 4 selftests: timers: set-timer-lat
  ok 6 selftests: timers: inconsistency-check
  ok 7 selftests: timers: raw_skew

https://bugs.launchpad.net/bugs/1864626
Fixes: 852c8cb ("selftests/kselftest/runner.sh: Add 45 second timeout per test")
Signed-off-by: Po-Hsu Lin <po-hsu.lin@canonical.com>
Acked-by: John Stultz <john.stultz@linaro.org>
Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
When pm8001_tag_alloc() fails, task should be freed just like it is done in
the subsequent error paths.

Link: https://lore.kernel.org/r/20200823091453.4782-1-dinghao.liu@zju.edu.cn
Acked-by: Jack Wang <jinpu.wang@cloud.ionos.com>
Signed-off-by: Dinghao Liu <dinghao.liu@zju.edu.cn>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Fix for '&fp->skb' double free.

Link:
https://lore.kernel.org/r/20200825093940.19612-1-jhasan@marvell.com
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Javed Hasan <jhasan@marvell.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Commit 98aee70 ("qla2xxx: Add endianizer to max_payload_size
modifier.") in 2014 broke qla2xxx on sparc64, e.g. as in the Sun Blade 1000
/ 2000. Unbreak by partial revert to fix endianness in nvram firmware
default initialization. Also mark the second frame_payload_size in nvram_t
__le16 to avoid new sparse warnings.

Link: https://lore.kernel.org/r/20200827.222729.1875148247374704975.rene@exactcode.com
Fixes: 98aee70 ("qla2xxx: Add endianizer to max_payload_size modifier.")
Reviewed-by: Himanshu Madhani <himanshu.madhani@oracle.com>
Reviewed-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: Arun Easi <aeasi@marvell.com>
Signed-off-by: René Rebe <rene@exactcode.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Some systems are reporting the following log message during driver unload
or system shutdown:

  ics_rtas_set_affinity: No online cpus in the mask

A prior commit introduced the writing of an empty affinity mask in calls to
irq_set_affinity_hint() when disabling interrupts or when there are no
remaining online CPUs to service an eq interrupt. At least some ppc64
systems are checking whether affinity masks are empty or not.

Do not call irq_set_affinity_hint() with an empty CPU mask.

Fixes: dcaa213 ("scsi: lpfc: Change default IRQ model on AMD architectures")
Link: https://lore.kernel.org/r/20200828175332.130300-2-james.smart@broadcom.com
Cc: <stable@vger.kernel.org> # v5.5+
Co-developed-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
The driver is unable to successfully login with remote device. During pt2pt
login, the driver completes its FLOGI request with the remote device having
WWN precedence.  The remote device issues its own (delayed) FLOGI after
accepting the driver's and, upon transmitting the FLOGI, immediately
recognizes it has already processed the driver's FLOGI thus it transitions
to sending a PLOGI before waiting for an ACC to its FLOGI.

In the driver, the FLOGI is received and an ACC sent, followed by the PLOGI
being received and an ACC sent. The issue is that the PLOGI reception
occurs before the response from the adapter from the FLOGI ACC is
received. Processing of the PLOGI sets state flags to perform the REG_RPI
mailbox command and proceed with the rest of discovery on the port. The
same completion routine used by both FLOGI and PLOGI is generic in
nature. One of the things it does is clear flags, and those flags happen to
drive the rest of discovery.  So what happened was the PLOGI processing set
the flags, the FLOGI ACC completion cleared them, thus when the PLOGI ACC
completes it doesn't see the flags and stops.

Fix by modifying the generic completion routine to not clear the rest of
discovery flag (NLP_ACC_REGLOGIN) unless the completion is also associated
with performing a mailbox command as part of its handling.  For things such
as FLOGI ACC, there isn't a subsequent action to perform with the adapter,
thus there is no mailbox cmd ptr. PLOGI ACC though will perform REG_RPI
upon completion, thus there is a mailbox cmd ptr.

Link: https://lore.kernel.org/r/20200828175332.130300-3-james.smart@broadcom.com
Co-developed-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
…l events

Currently the driver registers for Link Integrity events only.

This patch adds registration for the following FPIN types:

 - Delivery Notifications
 - Congestion Notification
 - Peer Congestion Notification

Link: https://lore.kernel.org/r/20200828175332.130300-4-james.smart@broadcom.com
Co-developed-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Update lpfc version to 12.8.0.4

Link: https://lore.kernel.org/r/20200828175332.130300-5-james.smart@broadcom.com
Co-developed-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: Dick Kennedy <dick.kennedy@broadcom.com>
Signed-off-by: James Smart <james.smart@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Current code does not consider 'page_off' in data digest calculation. To
fix this, add a local variable 'first_sg' and set first_sg.offset to
sg->offset + page_off.

Link: https://lore.kernel.org/r/1598358910-3052-1-git-send-email-varun@chelsio.com
Fixes: e48354c ("iscsi-target: Add iSCSI fabric support for target v4.1")
Cc: <stable@vger.kernel.org>
Reviewed-by: Mike Christie <michael.christie@oralce.com>
Signed-off-by: Varun Prakash <varun@chelsio.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
It was discovered that sdparm will fail when attempting to disable write
cache on a SATA disk connected via libsas.

In the ATA command set the write cache state is controlled through the SET
FEATURES operation. This is roughly corresponds to MODE SELECT in SCSI and
the latter command is what is used in the SCSI-ATA translation layer. A
subtle difference is that a MODE SELECT carries data whereas SET FEATURES
is defined as a non-data command in ATA.

Set the DMA data direction to DMA_NONE if the requested ATA command is
identified as non-data.

[mkp: commit desc]

Fixes: fa1c1e8 ("[SCSI] Add SATA support to libsas")
Link: https://lore.kernel.org/r/1598426666-54544-1-git-send-email-luojiaxing@huawei.com
Reviewed-by: John Garry <john.garry@huawei.com>
Reviewed-by: Jason Yan <yanaijie@huawei.com>
Signed-off-by: Luo Jiaxing <luojiaxing@huawei.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
…>np_login_sem

The iSCSI target login thread might get stuck with the following stack:

cat /proc/`pidof iscsi_np`/stack
[<0>] down_interruptible+0x42/0x50
[<0>] iscsit_access_np+0xe3/0x167
[<0>] iscsi_target_locate_portal+0x695/0x8ac
[<0>] __iscsi_target_login_thread+0x855/0xb82
[<0>] iscsi_target_login_thread+0x2f/0x5a
[<0>] kthread+0xfa/0x130
[<0>] ret_from_fork+0x1f/0x30

This can be reproduced via the following steps:

1. Initiator A tries to log in to iqn1-tpg1 on port 3260. After finishing
   PDU exchange in the login thread and before the negotiation is finished
   the the network link goes down. At this point A has not finished login
   and tpg->np_login_sem is held.

2. Initiator B tries to log in to iqn2-tpg1 on port 3260. After finishing
   PDU exchange in the login thread the target expects to process remaining
   login PDUs in workqueue context.

3. Initiator A' tries to log in to iqn1-tpg1 on port 3260 from a new
   socket. A' will wait for tpg->np_login_sem with np->np_login_timer
   loaded to wait for at most 15 seconds. The lock is held by A so A'
   eventually times out.

4. Before A' got timeout initiator B gets negotiation failed and calls
   iscsi_target_login_drop()->iscsi_target_login_sess_out().  The
   np->np_login_timer is canceled and initiator A' will hang forever.
   Because A' is now in the login thread, no new login requests can be
   serviced.

Fix this by moving iscsi_stop_login_thread_timer() out of
iscsi_target_login_sess_out(). Also remove iscsi_np parameter from
iscsi_target_login_sess_out().

Link: https://lore.kernel.org/r/20200729130343.24976-1-houpu@bytedance.com
Cc: stable@vger.kernel.org
Reviewed-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Hou Pu <houpu@bytedance.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
disable_irq() might sleep. Replace it with disable_irq_nosync() which is
sufficient as irq_poll_scheduled protects against concurrently running
complete_cmd_fusion() from megasas_irqpoll() and megasas_isr_fusion().

Link: https://lore.kernel.org/r/20200827165332.8432-1-thenzl@redhat.com
Fixes: a6ffd5b scsi: megaraid_sas: Call disable_irq from process IRQ poll
Signed-off-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
disable_irq() might sleep, replace it with disable_irq_nosync(). For
synchronisation 'irq_poll_scheduled' is sufficient

Fixes: 320e77a scsi: mpt3sas: Irq poll to avoid CPU hard lockups
Link: https://lore.kernel.org/r/20200901145026.12174-1-thenzl@redhat.com
Signed-off-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
…it/jejb/scsi

Pull SCSI fixes from James Bottomley:
 "Eleven fixes, mostly in drivers or minor fixes in driver related
  infrastructure libraries (target, libfc and libsas).

  Most of the bugs fixed only show up under rare circumstances, the
  exception being the endianness problem in qla2xxx which is used as a
  device on some sparc systems"

* tag 'scsi-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi:
  scsi: mpt3sas: Don't call disable_irq from IRQ poll handler
  scsi: megaraid_sas: Don't call disable_irq from process IRQ poll
  scsi: target: iscsi: Fix hang in iscsit_access_np() when getting tpg->np_login_sem
  scsi: libsas: Set data_dir as DMA_NONE if libata marks qc as NODATA
  scsi: target: iscsi: Fix data digest calculation
  scsi: lpfc: Update lpfc version to 12.8.0.4
  scsi: lpfc: Extend the RDF FPIN Registration descriptor for additional events
  scsi: lpfc: Fix FLOGI/PLOGI receive race condition in pt2pt discovery
  scsi: lpfc: Fix setting IRQ affinity with an empty CPU mask
  scsi: qla2xxx: Fix regression on sparc64
  scsi: libfc: Fix for double free()
  scsi: pm8001: Fix memleak in pm8001_exec_internal_task_abort
…inux/kernel/git/shuah/linux-kselftest

Pull kselftest fix from Shuah Khan:
 "A single fix to timers test to disable timeout setting for tests to
  run and report accurate results"

* tag 'linux-kselftest-5.9-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/shuah/linux-kselftest:
  selftests/timers: Turn off timeout setting
@pull pull bot added the ⤵️ pull label Sep 8, 2020
@pull pull bot merged commit 34d4ddd into bergwolf:master Sep 8, 2020
pull bot pushed a commit that referenced this pull request Feb 10, 2021
Channel device_node deletion is managed by the device driver rather than
the dmaengine core. The deletion was accidentally introduced when making
channel unregister dynamic. It causes xilinx_dma module to crash on unload
as reported by Radhey. Remove chan->device_node delete in dmaengine and
also fix up idxd driver.

[   42.142705] Internal error: Oops: 96000044 [#1] SMP
[   42.147566] Modules linked in: xilinx_dma(-) clk_xlnx_clock_wizard uio_pdrv_genirq
[   42.155139] CPU: 1 PID: 2075 Comm: rmmod Not tainted 5.10.1-00026-g3a2e6dd7a05-dirty #192
[   42.163302] Hardware name: Enclustra XU5 SOM (DT)
[   42.167992] pstate: 40000005 (nZcv daif -PAN -UAO -TCO BTYPE=--)
[   42.173996] pc : xilinx_dma_chan_remove+0x74/0xa0 [xilinx_dma]
[   42.179815] lr : xilinx_dma_chan_remove+0x70/0xa0 [xilinx_dma]
[   42.185636] sp : ffffffc01112bca0
[   42.188935] x29: ffffffc01112bca0 x28: ffffff80402ea640

xilinx_dma_chan_remove+0x74/0xa0:
__list_del at ./include/linux/list.h:112 (inlined by)
__list_del_entry at./include/linux/list.h:135 (inlined by)
list_del at ./include/linux/list.h:146 (inlined by)
xilinx_dma_chan_remove at drivers/dma/xilinx/xilinx_dma.c:2546

Fixes: e81274c ("dmaengine: add support to dynamic register/unregister of channels")
Reported-by: Radhey Shyam Pandey <radheys@xilinx.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Tested-by: Radhey Shyam Pandey <radhey.shyam.pandey@xilinx.com>
Link: https://lore.kernel.org/r/161099092469.2495902.5064826526660062342.stgit@djiang5-desk3.ch.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Cc: stable@vger.kernel.org # 5.9+
pull bot pushed a commit that referenced this pull request Dec 15, 2022
The current walk_stackframe with FRAME_POINTER would stop unwinding at
ret_from_exception:
  BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1518
  in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 1, name: init
  CPU: 0 PID: 1 Comm: init Not tainted 5.10.113-00021-g15c15974895c-dirty #192
  Call Trace:
  [<ffffffe0002038c8>] walk_stackframe+0x0/0xee
  [<ffffffe000aecf48>] show_stack+0x32/0x4a
  [<ffffffe000af1618>] dump_stack_lvl+0x72/0x8e
  [<ffffffe000af1648>] dump_stack+0x14/0x1c
  [<ffffffe000239ad2>] ___might_sleep+0x12e/0x138
  [<ffffffe000239aec>] __might_sleep+0x10/0x18
  [<ffffffe000afe3fe>] down_read+0x22/0xa4
  [<ffffffe000207588>] do_page_fault+0xb0/0x2fe
  [<ffffffe000201b80>] ret_from_exception+0x0/0xc

The optimization would help walk_stackframe cross the pt_regs frame and
get more backtrace of debug info:
  BUG: sleeping function called from invalid context at kernel/locking/rwsem.c:1518
  in_atomic(): 0, irqs_disabled(): 1, non_block: 0, pid: 1, name: init
  CPU: 0 PID: 1 Comm: init Not tainted 5.10.113-00021-g15c15974895c-dirty #192
  Call Trace:
  [<ffffffe0002038c8>] walk_stackframe+0x0/0xee
  [<ffffffe000aecf48>] show_stack+0x32/0x4a
  [<ffffffe000af1618>] dump_stack_lvl+0x72/0x8e
  [<ffffffe000af1648>] dump_stack+0x14/0x1c
  [<ffffffe000239ad2>] ___might_sleep+0x12e/0x138
  [<ffffffe000239aec>] __might_sleep+0x10/0x18
  [<ffffffe000afe3fe>] down_read+0x22/0xa4
  [<ffffffe000207588>] do_page_fault+0xb0/0x2fe
  [<ffffffe000201b80>] ret_from_exception+0x0/0xc
  [<ffffffe000613c06>] riscv_intc_irq+0x1a/0x72
  [<ffffffe000201b80>] ret_from_exception+0x0/0xc
  [<ffffffe00033f44a>] vma_link+0x54/0x160
  [<ffffffe000341d7a>] mmap_region+0x2cc/0x4d0
  [<ffffffe000342256>] do_mmap+0x2d8/0x3ac
  [<ffffffe000326318>] vm_mmap_pgoff+0x70/0xb8
  [<ffffffe00032638a>] vm_mmap+0x2a/0x36
  [<ffffffe0003cfdde>] elf_map+0x72/0x84
  [<ffffffe0003d05f8>] load_elf_binary+0x69a/0xec8
  [<ffffffe000376240>] bprm_execve+0x246/0x53a
  [<ffffffe00037786c>] kernel_execve+0xe8/0x124
  [<ffffffe000aecdf2>] run_init_process+0xfa/0x10c
  [<ffffffe000aece16>] try_to_run_init_process+0x12/0x3c
  [<ffffffe000afa920>] kernel_init+0xb4/0xf8
  [<ffffffe000201b80>] ret_from_exception+0x0/0xc

Here is the error injection test code for the above output:
 drivers/irqchip/irq-riscv-intc.c:
 static asmlinkage void riscv_intc_irq(struct pt_regs *regs)
 {
        unsigned long cause = regs->cause & ~CAUSE_IRQ_FLAG;
+       u32 tmp; __get_user(tmp, (u32 *)0);

Signed-off-by: Guo Ren <guoren@linux.alibaba.com>
Signed-off-by: Guo Ren <guoren@kernel.org>
Link: https://lore.kernel.org/r/20221109064937.3643993-3-guoren@kernel.org
[Palmer: use SYM_CODE_*]
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
pull bot pushed a commit that referenced this pull request Feb 7, 2024
With default config, the value of NR_CPUS is 64. When HW platform has
more then 64 cpus, system will crash on these platforms. MAX_CORE_PIC
is the maximum cpu number in MADT table (max physical number) which can
exceed the supported maximum cpu number (NR_CPUS, max logical number),
but kernel should not crash. Kernel should boot cpus with NR_CPUS, let
the remainder cpus stay in BIOS.

The potential crash reason is that the array acpi_core_pic[NR_CPUS] can
be overflowed when parsing MADT table, and it is obvious that CORE_PIC
should be corresponding to physical core rather than logical core, so it
is better to define the array as acpi_core_pic[MAX_CORE_PIC].

With the patch, system can boot up 64 vcpus with qemu parameter -smp 128,
otherwise system will crash with the following message.

[    0.000000] CPU 0 Unable to handle kernel paging request at virtual address 0000420000004259, era == 90000000037a5f0c, ra == 90000000037a46ec
[    0.000000] Oops[#1]:
[    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 6.8.0-rc2+ #192
[    0.000000] Hardware name: QEMU QEMU Virtual Machine, BIOS unknown 2/2/2022
[    0.000000] pc 90000000037a5f0c ra 90000000037a46ec tp 9000000003c90000 sp 9000000003c93d60
[    0.000000] a0 0000000000000019 a1 9000000003d93bc0 a2 0000000000000000 a3 9000000003c93bd8
[    0.000000] a4 9000000003c93a74 a5 9000000083c93a67 a6 9000000003c938f0 a7 0000000000000005
[    0.000000] t0 0000420000004201 t1 0000000000000000 t2 0000000000000001 t3 0000000000000001
[    0.000000] t4 0000000000000003 t5 0000000000000000 t6 0000000000000030 t7 0000000000000063
[    0.000000] t8 0000000000000014 u0 ffffffffffffffff s9 0000000000000000 s0 9000000003caee98
[    0.000000] s1 90000000041b0480 s2 9000000003c93da0 s3 9000000003c93d98 s4 9000000003c93d90
[    0.000000] s5 9000000003caa000 s6 000000000a7fd000 s7 000000000f556b60 s8 000000000e0a4330
[    0.000000]    ra: 90000000037a46ec platform_init+0x214/0x250
[    0.000000]   ERA: 90000000037a5f0c efi_runtime_init+0x30/0x94
[    0.000000]  CRMD: 000000b0 (PLV0 -IE -DA +PG DACF=CC DACM=CC -WE)
[    0.000000]  PRMD: 00000000 (PPLV0 -PIE -PWE)
[    0.000000]  EUEN: 00000000 (-FPE -SXE -ASXE -BTE)
[    0.000000]  ECFG: 00070800 (LIE=11 VS=7)
[    0.000000] ESTAT: 00010000 [PIL] (IS= ECode=1 EsubCode=0)
[    0.000000]  BADV: 0000420000004259
[    0.000000]  PRID: 0014c010 (Loongson-64bit, Loongson-3A5000)
[    0.000000] Modules linked in:
[    0.000000] Process swapper (pid: 0, threadinfo=(____ptrval____), task=(____ptrval____))
[    0.000000] Stack : 9000000003c93a14 9000000003800898 90000000041844f8 90000000037a46ec
[    0.000000]         000000000a7fd000 0000000008290000 0000000000000000 0000000000000000
[    0.000000]         0000000000000000 0000000000000000 00000000019d8000 000000000f556b60
[    0.000000]         000000000a7fd000 000000000f556b08 9000000003ca7700 9000000003800000
[    0.000000]         9000000003c93e50 9000000003800898 9000000003800108 90000000037a484c
[    0.000000]         000000000e0a4330 000000000f556b60 000000000a7fd000 000000000f556b08
[    0.000000]         9000000003ca7700 9000000004184000 0000000000200000 000000000e02b018
[    0.000000]         000000000a7fd000 90000000037a0790 9000000003800108 0000000000000000
[    0.000000]         0000000000000000 000000000e0a4330 000000000f556b60 000000000a7fd000
[    0.000000]         000000000f556b08 000000000eaae298 000000000eaa5040 0000000000200000
[    0.000000]         ...
[    0.000000] Call Trace:
[    0.000000] [<90000000037a5f0c>] efi_runtime_init+0x30/0x94
[    0.000000] [<90000000037a46ec>] platform_init+0x214/0x250
[    0.000000] [<90000000037a484c>] setup_arch+0x124/0x45c
[    0.000000] [<90000000037a0790>] start_kernel+0x90/0x670
[    0.000000] [<900000000378b0d8>] kernel_entry+0xd8/0xdc

Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
pull bot pushed a commit that referenced this pull request Jul 16, 2024
The distributor and PMR/RPR can present different views of the interrupt
priority space dependent upon the values of GICD_CTLR.DS and
SCR_EL3.FIQ. Currently we treat the distributor's view of the priority
space as canonical, and when the two differ we change the way we handle
values in the PMR/RPR, using the `gic_nonsecure_priorities` static key
to decide what to do.

This approach works, but it's sub-optimal. When using pseudo-NMI we
manipulate the distributor rarely, and we manipulate the PMR/RPR
registers very frequently in code spread out throughout the kernel (e.g.
local_irq_{save,restore}()). It would be nicer if we could use fixed
values for the PMR/RPR, and dynamically choose the values programmed
into the distributor.

This patch changes the GICv3 driver and arm64 code accordingly. PMR
values are chosen at compile time, and the GICv3 driver determines the
appropriate values to program into the distributor at boot time. This
removes the need for the `gic_nonsecure_priorities` static key and
results in smaller and better generated code for saving/restoring the
irqflags.

Before this patch, local_irq_disable() compiles to:

| 0000000000000000 <outlined_local_irq_disable>:
|    0:   d503201f        nop
|    4:   d50343df        msr     daifset, #0x3
|    8:   d65f03c0        ret
|    c:   d503201f        nop
|   10:   d2800c00        mov     x0, #0x60                       // #96
|   14:   d5184600        msr     icc_pmr_el1, x0
|   18:   d65f03c0        ret
|   1c:   d2801400        mov     x0, #0xa0                       // #160
|   20:   17fffffd        b       14 <outlined_local_irq_disable+0x14>

After this patch, local_irq_disable() compiles to:

| 0000000000000000 <outlined_local_irq_disable>:
|    0:   d503201f        nop
|    4:   d50343df        msr     daifset, #0x3
|    8:   d65f03c0        ret
|    c:   d2801800        mov     x0, #0xc0                       // #192
|   10:   d5184600        msr     icc_pmr_el1, x0
|   14:   d65f03c0        ret

... with 3 fewer instructions per call.

For defconfig + CONFIG_PSEUDO_NMI=y, this results in a minor saving of
~4K of text, and will make it easier to make further improvements to the
way we manipulate irqflags and DAIF bits.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: Alexandru Elisei <alexandru.elisei@arm.com>
Cc: Marc Zyngier <maz@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Will Deacon <will@kernel.org>
Reviewed-by: Marc Zyngier <maz@kernel.org>
Tested-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20240617111841.2529370-6-mark.rutland@arm.com
Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
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