git.kernel.dk Git - linux-block.git/log

KVM: PPC: Book3S HV: Fix IRQ map warnings with XICS on pSeries KVM Guest

The commit 9576730d0e6e ("KVM: PPC: select IRQ_BYPASS_MANAGER") enabled
IRQ_BYPASS_MANAGER when CONFIG_KVM was set. Subsequently, commit
c57875f5f9be ("KVM: PPC: Book3S HV: Enable IRQ bypass") enabled IRQ
bypass and added the necessary callbacks to create/remove the mappings
between host real IRQ and the guest GSI.

The availability of IRQ bypass is determined by the arch-specific
function kvm_arch_has_irq_bypass(), which invokes
kvmppc_irq_bypass_add_producer_hv(). This function, in turn, calls
kvmppc_set_passthru_irq_hv() to create a mapping in the passthrough IRQ
map, associating a host IRQ to a guest GSI.

However, when a pSeries KVM guest (L2) is booted within an LPAR (L1)
with the kernel boot parameter `xive=off`, it defaults to using emulated
XICS controller. As an attempt to establish host IRQ to guest GSI
mappings via kvmppc_set_passthru_irq() on a PCI device hotplug
(passhthrough) operation fail, returning -ENOENT. This failure occurs
because only interrupts with EOI operations handled through OPAL calls
(verified via is_pnv_opal_msi()) are currently supported.

These mapping failures lead to below repeated warnings in the L1 host:

[  509.220349] kvmppc_set_passthru_irq_hv: Could not assign IRQ map for (58,4970)
[  509.220368] kvmppc_set_passthru_irq (irq 58, gsi 4970) fails: -2
[  509.220376] vfio-pci 0015:01:00.0: irq bypass producer (token 0000000090bc635b) registration fails: -2
...
[  509.291781] vfio-pci 0015:01:00.0: irq bypass producer (token 000000003822eed8) registration fails: -2

Fix this by restricting IRQ bypass enablement on pSeries systems by
making the IRQ bypass callbacks unavailable when running on pSeries
platform.

Signed-off-by: Amit Machhiwal <amachhiw@linux.ibm.com>
Tested-by: Gautam Menghani <gautam@linux.ibm.com>
Reviewed-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250425185641.1611857-1-amachhiw@linux.ibm.com

powerpc/8xx: Reduce alignment constraint for kernel memory

8xx has three large page sizes: 8M, 512k and 16k.

A too big alignment can lead to wasting memory. On a board which has
only 32 MBytes of RAM, every single byte is worth it and a 512k
alignment is sometimes too much.

Allow mapping kernel memory with 16k pages and reduce the constraint
on kernel memory alignment. 512k and 16k pages are handled the same
way so reverse tests in order to make 8M pages the special case and
other ones (512k and 16k) the alternative.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/fa9927b70df13627cdf10b992ea71d6562c7760e.1746191262.git.christophe.leroy@csgroup.eu

powerpc/boot: Fix build with gcc 15

Similar to x86 the ppc boot code does not build with GCC 15.

Copy the fix from
commit ee2ab467bddf ("x86/boot: Use '-std=gnu11' to fix build with GCC 15")

Signed-off-by: Michal Suchanek <msuchanek@suse.de>
Tested-by: Amit Machhiwal <amachhiw@linux.ibm.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250331105722.19709-1-msuchanek@suse.de

powerpc/pseries/htmdump: Add documentation for H_HTM debugfs interface

Documentation for HTM (Hardware Trace Macro) debugfs interface
and how it can be used to configure/control the HTM operations.

Signed-off-by: Athira Rajeev <atrajeev@linux.ibm.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250420180844.53128-10-atrajeev@linux.ibm.com

powerpc/pseries/htmdump: Add htm capabilities support to htmdump module

Support dumping HTM capabilities information from Hardware
Trace Macro (HTM) function via debugfs interface. Under
debugfs folder "/sys/kernel/debug/powerpc/htmdump", add
file "htmcaps".

The interface allows only read of this file which will present the
content of HTM buffer from the hcall.

Signed-off-by: Athira Rajeev <atrajeev@linux.ibm.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250420180844.53128-9-atrajeev@linux.ibm.com

powerpc/pseries/htmdump: Add htm flags support to htmdump module

Under debugfs folder, "/sys/kernel/debug/powerpc/htmdump", add file
"htmflags". Currently supported flag value is to enable/disable
HTM buffer wrap. wrap is used along with "configure" to prevent
HTM buffer from wrapping. Writing 1 will set noWrap while
configuring HTM

Signed-off-by: Athira Rajeev <atrajeev@linux.ibm.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250420180844.53128-8-atrajeev@linux.ibm.com

powerpc/pseries/htmdump: Add htm setup support to htmdump module

Add htm setup support to htmdump module. To use the
HTM (Hardware Trace Macro), HTM buffer has to be allocated.
Support setup of HTM buffers via debugfs interface. Under
debugfs folder, "/sys/kernel/debug/powerpc/htmdump", add file
"htmsetup". The interface allows setup of HTM buffer by writing
size of HTM buffer in power of 2 to the "htmsetup" file

Signed-off-by: Athira Rajeev <atrajeev@linux.ibm.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250420180844.53128-7-atrajeev@linux.ibm.com

powerpc/pseries/htmdump: Add htm info support to htmdump module

Support dumping system processor configuration from Hardware
Trace Macro (HTM) function via debugfs interface. Under
debugfs folder "/sys/kernel/debug/powerpc/htmdump", add
file "htminfo".

The interface allows only read of this file which will present the
content of HTM buffer from the hcall. The 16th offset of HTM
buffer has value for the number of entries for array of processors.
Use this information to copy data to the debugfs file

Signed-off-by: Athira Rajeev <atrajeev@linux.ibm.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250420180844.53128-6-atrajeev@linux.ibm.com

powerpc/pseries/htmdump: Add htm status support to htmdump module

Support dumping status of Hardware Trace Macro (HTM) function
via debugfs interface. Under debugfs folder
"/sys/kernel/debug/powerpc/htmdump", add file "htmstatus".
The interface allows only read of this file which will present the
content of HTM status buffer from the hcall. The 16th offset of HTM
status buffer has value for the number of HTM entries in the status
buffer. Each nest htm status entry is 0x6 bytes, where as core HTM
status entry is 0x8 bytes. Calculate the number of bytes to read
based on this detail.

Signed-off-by: Athira Rajeev <atrajeev@linux.ibm.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250420180844.53128-5-atrajeev@linux.ibm.com

powerpc/pseries/htmdump: Add htm start support to htmdump module

Support starting of Hardware Trace Macro (HTM) function
via debugfs interface. Under debugfs folder
"/sys/kernel/debug/powerpc/htmdump", add file "htmstart".
The interface allows starting of htm via this file by
writing value "1". Also allows stopping of htm tracing by
writing value "0" to this file. Any other value returns
-EINVAL.

Signed-off-by: Athira Rajeev <atrajeev@linux.ibm.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250420180844.53128-4-atrajeev@linux.ibm.com

powerpc/pseries/htmdump: Add htm configure support to htmdump module

Support configuring of Hardware Trace Macro (HTM) function
via debugfs interface. Under debugfs folder
"/sys/kernel/debug/powerpc/htmdump", add file "htmconfigure".
The interface allows configuring of htm via this file
by writing value "1". Allow deconfiguring of htm via this file
by writing value "0". Any other value returns -EINVAL.

Signed-off-by: Athira Rajeev <atrajeev@linux.ibm.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250420180844.53128-3-atrajeev@linux.ibm.com

powerpc/pseries/htmdump: Add htm_hcall_wrapper to integrate other htm operations

H_HTM (Hardware Trace Macro) hypervisor call is an HCALL to export data
from Hardware Trace Macro (HTM) function. The debugfs interface to
export the HTM function data in an lpar currently supports only dumping
of HTM data in an lpar. To add support for setup, configuration and
control of HTM function via debugfs interface, update the hcall wrapper
function. Rename and update htm_get_dump_hardware to htm_hcall_wrapper()
so that it can be used for other HTM operations as well. Additionally
include parameter "htm_op". Update htmdump module to check the return
code of hcall in a separate function so that it can be reused for other
option too. Add check to disable the interface in guest environment.

Signed-off-by: Athira Rajeev <atrajeev@linux.ibm.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250420180844.53128-2-atrajeev@linux.ibm.com

powerpc: 8xx/gpio: use new line value setter callbacks

struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Acked-by: Christophe Leroy <christophe.leroy@csgroup.eu> # powerpc 8xx
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250502-gpiochip-set-rv-powerpc-v2-5-488e43e325bf@linaro.org

powerpc: 52xx/gpio: use new line value setter callbacks

struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250502-gpiochip-set-rv-powerpc-v2-4-488e43e325bf@linaro.org

powerpc: 44x/gpio: use new line value setter callbacks

struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250502-gpiochip-set-rv-powerpc-v2-3-488e43e325bf@linaro.org

powerpc: 83xx/gpio: use new line value setter callbacks

struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250502-gpiochip-set-rv-powerpc-v2-2-488e43e325bf@linaro.org

powerpc: sysdev/gpio: use new line value setter callbacks

struct gpio_chip now has callbacks for setting line values that return
an integer, allowing to indicate failures. Convert the driver to using
them.

Reviewed-by: Linus Walleij <linus.walleij@linaro.org>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Bartosz Golaszewski <bartosz.golaszewski@linaro.org>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250502-gpiochip-set-rv-powerpc-v2-1-488e43e325bf@linaro.org

Documentation: Fix description format for powerpc RTAS ioctls

Fix the description format for the following build warnings:

"Documentation/userspace-api/ioctl/ioctl-number.rst:369:
ERROR: Malformed table. Text in column margin in table line 301.

0xB2  03-05 arch/powerpc/include/uapi/asm/papr-indices.h
powerpc/pseries indices API
                            <mailto:linuxppc-dev>
0xB2  06-07 arch/powerpc/include/uapi/asm/papr-platform-dump.h
powerpc/pseries Platform Dump API
                            <mailto:linuxppc-dev>
0xB2  08  arch/powerpc/include/uapi/asm/papr-physical-attestation.h
powerpc/pseries Physical Attestation API
                            <mailto:linuxppc-dev>"

Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Haren Myneni <haren@linux.ibm.com>
Fixes: 43d869ac25f1 ("powerpc/pseries: Define papr_indices_io_block for papr-indices ioctls")
Fixes: 8aa9efc0be66 ("powerpc/pseries: Add papr-platform-dump character driver for dump retrieval")
Fixes: 86900ab620a4 ("powerpc/pseries: Add a char driver for physical-attestation RTAS")
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Closes: https://lore.kernel.org/linux-next/20250429181707.7848912b@canb.auug.org.au/
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250430022847.1118093-1-haren@linux.ibm.com

powerpc/pseries: Include linux/types.h in papr-platform-dump.h

Fix the following build warning:
usr/include/asm/papr-platform-dump.h:12: found __[us]{8,16,32,64} type without #include <linux/types.h>

Fixes: 8aa9efc0be66 ("powerpc/pseries: Add papr-platform-dump character driver for dump retrieval")
Closes: https://lore.kernel.org/linux-next/20250429185735.034ba678@canb.auug.org.au/
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Haren Myneni <haren@linux.ibm.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
[Maddy: fixed the commit to combine tags together]
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250429211419.1081354-1-haren@linux.ibm.com

powerpc: Don't use --- in kernel logs

When a kernel log containing --- at the start of a line is copied into
a patch message, 'git am' drops everything located after that ---.

Replace --- by ---- to avoid that.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/54a1f8d2c3fb5b95434039724c8c141052ae5cc0.1739346038.git.christophe.leroy@csgroup.eu

powerpc/crash: Fix non-smp kexec preparation

In non-smp configurations, crash_kexec_prepare is never called in
the crash shutdown path. One result of this is that the crashing_cpu
variable is never set, preventing crash_save_cpu from storing the
NT_PRSTATUS elf note in the core dump.

Fixes: c7255058b543 ("powerpc/crash: save cpu register data in crash_smp_send_stop()")
Signed-off-by: Eddie James <eajames@linux.ibm.com>
Reviewed-by: Hari Bathini <hbathini@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250211162054.857762-1-eajames@linux.ibm.com

powerpc: do not build ppc_save_regs.o always

The Fixes commit below tried to add CONFIG_PPC_BOOK3S to one of the
conditions to enable the build of ppc_save_regs.o. But it failed to do
so, in fact. The commit omitted to add a dollar sign.

Therefore, ppc_save_regs.o is built always these days (as
"(CONFIG_PPC_BOOK3S)" is never an empty string).

Fix this by adding the missing dollar sign.

Signed-off-by: Jiri Slaby (SUSE) <jirislaby@kernel.org>
Fixes: fc2a5a6161a2 ("powerpc/64s: ppc_save_regs is now needed for all 64s builds")
Acked-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250417105305.397128-1-jirislaby@kernel.org

powerpc/pseries/msi: Avoid reading PCI device registers in reduced power states

When a system is being suspended to RAM, the PCI devices are also
suspended and the PPC code ends up calling pseries_msi_compose_msg() and
this triggers the BUG_ON() in __pci_read_msi_msg() because the device at
this point is in reduced power state. In reduced power state, the memory
mapped registers of the PCI device are not accessible.

To replicate the bug:
1. Make sure deep sleep is selected
# cat /sys/power/mem_sleep
s2idle [deep]

2. Make sure console is not suspended (so that dmesg logs are visible)
echo N > /sys/module/printk/parameters/console_suspend

3. Suspend the system
echo mem > /sys/power/state

To fix this behaviour, read the cached msi message of the device when the
device is not in PCI_D0 power state instead of touching the hardware.

Fixes: a5f3d2c17b07 ("powerpc/pseries/pci: Add MSI domains")
Cc: stable@vger.kernel.org # v5.15+
Signed-off-by: Gautam Menghani <gautam@linux.ibm.com>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Reviewed-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250305090237.294633-1-gautam@linux.ibm.com

powerpc/bpf: fix JIT code size calculation of bpf trampoline

arch_bpf_trampoline_size() provides JIT size of the BPF trampoline
before the buffer for JIT'ing it is allocated. The total number of
instructions emitted for BPF trampoline JIT code depends on where
the final image is located. So, the size arrived at with the dummy
pass in arch_bpf_trampoline_size() can vary from the actual size
needed in  arch_prepare_bpf_trampoline().  When the instructions
accounted in  arch_bpf_trampoline_size() is less than the number of
instructions emitted during the actual JIT compile of the trampoline,
the below warning is produced:

  WARNING: CPU: 8 PID: 204190 at arch/powerpc/net/bpf_jit_comp.c:981 __arch_prepare_bpf_trampoline.isra.0+0xd2c/0xdcc

which is:

  /* Make sure the trampoline generation logic doesn't overflow */
  if (image && WARN_ON_ONCE(&image[ctx->idx] >
   (u32 *)rw_image_end - BPF_INSN_SAFETY)) {

So, during the dummy pass, instead of providing some arbitrary image
location, account for maximum possible instructions if and when there
is a dependency with image location for JIT'ing.

Fixes: d243b62b7bd3 ("powerpc64/bpf: Add support for bpf trampolines")
Reported-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Closes: https://lore.kernel.org/all/6168bfc8-659f-4b5a-a6fb-90a916dde3b3@linux.ibm.com/
Cc: stable@vger.kernel.org # v6.13+
Acked-by: Naveen N Rao (AMD) <naveen@kernel.org>
Tested-by: Venkat Rao Bagalkote <venkat88@linux.ibm.com>
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250422082609.949301-1-hbathini@linux.ibm.com

powerpc64/ftrace: fix clobbered r15 during livepatching

While r15 is clobbered always with PPC_FTRACE_OUT_OF_LINE, it is
not restored in livepatch sequence leading to not so obvious fails
like below:

  BUG: Unable to handle kernel data access on write at 0xc0000000000f9078
  Faulting instruction address: 0xc0000000018ff958
  Oops: Kernel access of bad area, sig: 11 [#1]
  ...
  NIP:  c0000000018ff958 LR: c0000000018ff930 CTR: c0000000009c0790
  REGS: c00000005f2e7790 TRAP: 0300   Tainted: G              K      (6.14.0+)
  MSR:  8000000000009033 <SF,EE,ME,IR,DR,RI,LE>  CR: 2822880b  XER: 20040000
  CFAR: c0000000008addc0 DAR: c0000000000f9078 DSISR: 0a000000 IRQMASK: 1
  GPR00: c0000000018f2584 c00000005f2e7a30 c00000000280a900 c000000017ffa488
  GPR04: 0000000000000008 0000000000000000 c0000000018f24fc 000000000000000d
  GPR08: fffffffffffe0000 000000000000000d 0000000000000000 0000000000008000
  GPR12: c0000000009c0790 c000000017ffa480 c00000005f2e7c78 c0000000000f9070
  GPR16: c00000005f2e7c90 0000000000000000 0000000000000000 0000000000000000
  GPR20: 0000000000000000 c00000005f3efa80 c00000005f2e7c60 c00000005f2e7c88
  GPR24: c00000005f2e7c60 0000000000000001 c0000000000f9078 0000000000000000
  GPR28: 00007fff97960000 c000000017ffa480 0000000000000000 c0000000000f9078
  ...
  Call Trace:
    check_heap_object+0x34/0x390 (unreliable)
  __mutex_unlock_slowpath.isra.0+0xe4/0x230
  seq_read_iter+0x430/0xa90
  proc_reg_read_iter+0xa4/0x200
  vfs_read+0x41c/0x510
  ksys_read+0xa4/0x190
  system_call_exception+0x1d0/0x440
  system_call_vectored_common+0x15c/0x2ec

Fix it by restoring r15 always.

Fixes: eec37961a56a ("powerpc64/ftrace: Move ftrace sequence out of line")
Reported-by: Viktor Malik <vmalik@redhat.com>
Closes: https://lore.kernel.org/lkml/1aec4a9a-a30b-43fd-b303-7a351caeccb7@redhat.com
Cc: stable@vger.kernel.org # v6.13+
Signed-off-by: Hari Bathini <hbathini@linux.ibm.com>
Tested-by: Viktor Malik <vmalik@redhat.com>
Acked-by: Naveen N Rao (AMD) <naveen@kernel.org>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250416191227.201146-1-hbathini@linux.ibm.com

powerpc/pseries: Add a char driver for physical-attestation RTAS

The RTAS call ibm,physical-attestation is used to retrieve
information about the trusted boot state of the firmware and
hypervisor on the system, and also Trusted Platform Modules (TPM)
data if the system is TCG 2.0 compliant.

This RTAS interface expects the caller to define different command
structs such as RetrieveTPMLog, RetrievePlatformCertificat and etc,
in a work area with a maximum size of 4K bytes and the response
buffer will be returned in the same work area.

The current implementation of this RTAS function is in the user
space but allocation of the work area is restricted with the system
lockdown. So this patch implements this RTAS function in the kernel
and expose to the user space with open/ioctl/read interfaces.

PAPR (2.13+ 21.3 ibm,physical-attestation) defines RTAS function:
- Pass the command struct to obtain the response buffer for the
  specific command.
- This RTAS function is sequence RTAS call and has to issue RTAS
  call multiple times to get the complete response buffer (max 64K).
  The hypervisor expects the first RTAS call with the sequence 1 and
  the subsequent calls with the sequence number returned from the
  previous calls.

Expose these interfaces to user space with a
/dev/papr-physical-attestation character device using the following
programming model:

int devfd = open("/dev/papr-physical-attestation");
int fd = ioctl(devfd, PAPR_PHY_ATTEST_IOC_HANDLE,
                      struct papr_phy_attest_io_block);
- The user space defines the command struct and requests the
   response for any command.
- Obtain the complete response buffer and returned the buffer as
   blob to the command specific FD.
size = read(fd, buf, len);
- Can retrieve the response buffer once or multiple times until the
   end of BLOB buffer.

Implemented this new kernel ABI support in librtas library for
system lockdown

Signed-off-by: Haren Myneni <haren@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250416225743.596462-8-haren@linux.ibm.com

powerpc/pseries: Add papr-platform-dump character driver for dump retrieval

ibm,platform-dump RTAS call in combination with writable mapping
/dev/mem is issued to collect platform dump from the hypervisor
and may need multiple calls to get the complete dump. The current
implementation uses rtas_platform_dump() API provided by librtas
library to issue these RTAS calls. But /dev/mem access by the
user space is prohibited under system lockdown.

The solution should be to restrict access to RTAS function in user
space and provide kernel interfaces to collect dump. This patch
adds papr-platform-dump character driver and expose standard
interfaces such as open / ioctl/ read to user space in ways that
are compatible with lockdown.

PAPR (7.3.3.4.1 ibm,platform-dump) provides a method to obtain
the complete dump:
- Each dump will be identified by ID called dump tag.
- A sequence of RTAS calls have to be issued until retrieve the
  complete dump. The hypervisor expects the first RTAS call with
  the sequence 0 and the subsequent calls with the sequence
  number returned from the previous calls.
- The hypervisor returns "dump complete" status once the complete
  dump is retrieved. But expects one more RTAS call from the
  partition with the NULL buffer to invalidate dump which means
  the dump will be removed in the hypervisor.
- Sequence of calls are allowed with different dump IDs at the
  same time but not with the same dump ID.

Expose these interfaces to user space with a /dev/papr-platform-dump
character device using the following programming model:

   int devfd = open("/dev/papr-platform-dump", O_RDONLY);
   int fd = ioctl(devfd,PAPR_PLATFORM_DUMP_IOC_CREATE_HANDLE, &dump_id)
- Restrict user space to access with the same dump ID.
          Typically we do not expect user space requests the dump
          again for the same dump ID.
   char *buf = malloc(size);
   length = read(fd, buf, size);
        - size should be minimum 1K based on PAPR and  <= 4K based
          on RTAS work area size. It will be restrict to RTAS work
          area size. Using 4K work area based on the current
          implementation in librtas library
        - Each read call issue RTAS call to get the data based on
          the size requirement and returns bytes returned from the
          hypervisor
        - If the previous call returns dump complete status, the
          next read returns 0 like EOF.
   ret = ioctl(PAPR_PLATFORM_DUMP_IOC_INVALIDATE, &dump_id)
- RTAS call with NULL buffer to invalidates the dump.

The read API should use the file descriptor obtained from ioctl
based on dump ID so that gets dump contents for the corresponding
dump ID. Implemented support in librtas (rtas_platform_dump()) for
this new ABI to support system lockdown.

Signed-off-by: Haren Myneni <haren@linux.ibm.com>
Tested-by: Sathvika Vasireddy <sv@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250416225743.596462-7-haren@linux.ibm.com

powerpc/pseries: Add ibm,get-dynamic-sensor-state RTAS call support

The RTAS call ibm,get-dynamic-sensor-state is used to get the
sensor state identified by the location code and the sensor
token. The librtas library provides an API
rtas_get_dynamic_sensor() which uses /dev/mem access for work
area allocation but is restricted under system lockdown.

This patch provides an interface with new ioctl
PAPR_DYNAMIC_SENSOR_IOC_GET to the papr-indices character
driver which executes this HCALL and copies the sensor state
in the user specified ioctl buffer.

Refer PAPR 7.3.19 ibm,get-dynamic-sensor-state for more
information on this RTAS call.
- User input parameters to the RTAS call: location code string
  and the sensor token

Expose these interfaces to user space with a /dev/papr-indices
character device using the following programming model:
int fd = open("/dev/papr-indices", O_RDWR);
int ret = ioctl(fd, PAPR_DYNAMIC_SENSOR_IOC_GET,
struct papr_indices_io_block)
  - The user space specifies input parameters in
    papr_indices_io_block struct
  - Returned state for the specified sensor is copied to
    papr_indices_io_block.dynamic_param.state

Signed-off-by: Haren Myneni <haren@linux.ibm.com>
Tested-by: Sathvika Vasireddy <sv@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250416225743.596462-6-haren@linux.ibm.com

powerpc/pseries: Add ibm,set-dynamic-indicator RTAS call support

The RTAS call ibm,set-dynamic-indicator is used to set the new
indicator state identified by a location code. The current
implementation uses rtas_set_dynamic_indicator() API provided by
librtas library which allocates RMO buffer and issue this RTAS
call in the user space. But /dev/mem access by the user space
is prohibited under system lockdown.

This patch provides an interface with new ioctl
PAPR_DYNAMIC_INDICATOR_IOC_SET to the papr-indices character
driver and expose this interface to the user space that is
compatible with lockdown.

Refer PAPR 7.3.18 ibm,set-dynamic-indicator for more
information on this RTAS call.
-  User input parameters to the RTAS call: location code
   string, indicator token and new state

Expose these interfaces to user space with a /dev/papr-indices
character device using the following programming model:
int fd = open("/dev/papr-indices", O_RDWR);
int ret = ioctl(fd, PAPR_DYNAMIC_INDICATOR_IOC_SET,
struct papr_indices_io_block)
  - The user space passes input parameters in papr_indices_io_block
    struct

Signed-off-by: Haren Myneni <haren@linux.ibm.com>
Tested-by: Sathvika Vasireddy <sv@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250416225743.596462-5-haren@linux.ibm.com

powerpc/pseries: Add papr-indices char driver for ibm,get-indices

The RTAS call ibm,get-indices is used to obtain indices and
location codes for a specified indicator or sensor token. The
current implementation uses rtas_get_indices() API provided by
librtas library which allocates RMO buffer and issue this RTAS
call in the user space. But writable mapping /dev/mem access by
the user space is prohibited under system lockdown.

To overcome the restricted access in the user space, the kernel
provide interfaces to collect indices data from the hypervisor.
This patch adds papr-indices character driver and expose standard
interfaces such as open / ioctl/ read to user space in ways that
are compatible with lockdown.

PAPR (2.13 7.3.17 ibm,get-indices RTAS Call) describes the
following steps to retrieve all indices data:
- User input parameters to the RTAS call: sensor or indicator,
  and indice type
- ibm,get-indices is sequence RTAS call which means has to issue
  multiple times to get the entire list of indicators or sensors
  of a particular type. The hypervisor expects the first RTAS call
  with the sequence 1 and the subsequent calls with the sequence
  number returned from the previous calls.
- The OS may not interleave calls to ibm,get-indices for different
  indicator or sensor types. Means other RTAS calls with different
  type should not be issued while the previous type sequence is in
  progress. So collect the entire list of indices and copied to
  buffer BLOB during ioctl() and expose this buffer to the user
  space with the file descriptor.
- The hypervisor fills the work area with a specific format but
  does not return the number of bytes written to the buffer.
  Instead of parsing the data for each call to determine the data
  length, copy the work area size (RTAS_GET_INDICES_BUF_SIZE) to
  the buffer. Return work-area size of data to the user space for
  each read() call.

Expose these interfaces to user space with a /dev/papr-indices
character device using the following programming model:

int devfd = open("/dev/papr-indices", O_RDONLY);
int fd = ioctl(devfd, PAPR_INDICES_IOC_GET,
struct papr_indices_io_block)
  - Collect all indices data for the specified token to the buffer
char *buf = malloc(RTAS_GET_INDICES_BUF_SIZE);
length = read(fd, buf,  RTAS_GET_INDICES_BUF_SIZE)
  - RTAS_GET_INDICES_BUF_SIZE of data is returned to the user
    space.
  - The user space retrieves the indices and their location codes
    from the buffer
  - Should issue multiple read() calls until reaches the end of
    BLOB buffer.

The read() should use the file descriptor obtained from ioctl to
get the data that is exposed to file descriptor. Implemented
support in librtas (rtas_get_indices()) for this new ABI for
system lockdown.

Signed-off-by: Haren Myneni <haren@linux.ibm.com>
Tested-by: Sathvika Vasireddy <sv@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250416225743.596462-4-haren@linux.ibm.com

powerpc/pseries: Define papr_indices_io_block for papr-indices ioctls

To issue ibm,get-indices, ibm,set-dynamic-indicator and
ibm,get-dynamic-sensor-state in the user space, the RMO buffer is
allocated for the work area which is restricted under system
lockdown. So instead of user space execution, the kernel will
provide /dev/papr-indices interface to execute these RTAS calls.

The user space assigns data in papr_indices_io_block struct
depends on the specific HCALL and passes to the following ioctls:

PAPR_INDICES_IOC_GET: Use for ibm,get-indices. Returns a
get-indices handle fd to read data.
PAPR_DYNAMIC_SENSOR_IOC_GET: Use for ibm,get-dynamic-sensor-state.
Updates the sensor state in
papr_indices_io_block.dynamic_param.state

PAPR_DYNAMIC_INDICATOR_IOC_SET: Use for ibm,set-dynamic-indicator.
Sets the new state for the input
indicator.

Signed-off-by: Haren Myneni <haren@linux.ibm.com>
Tested-by: Sathvika Vasireddy <sv@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250416225743.596462-3-haren@linux.ibm.com

powerpc/pseries: Define common functions for RTAS sequence calls

The RTAS call can be normal where retrieves the data form the
hypervisor once or sequence based RTAS call which has to
issue multiple times until the complete data is obtained. For
some of these sequence RTAS calls, the OS should not interleave
calls with different input until the sequence is completed.
The data is collected for each call and copy to the buffer
for the entire sequence during ioctl() handle and then expose
this buffer to the user space with read() handle.

One such sequence RTAS call is ibm,get-vpd and its support is
already included in the current code. To add the similar support
for other sequence based calls, move the common functions in to
separate file and update papr_rtas_sequence struct with the
following callbacks so that RTAS call specific code will be
defined and executed to complete the sequence.

struct papr_rtas_sequence {
        int error;
        void params;
        void (*begin) (struct papr_rtas_sequence *);
        void (*end) (struct papr_rtas_sequence *);
        const char * (*work) (struct papr_rtas_sequence *, size_t *);
};

params: Input parameters used to pass for RTAS call.
Begin: RTAS call specific function to initialize data
including work area allocation.
End: RTAS call specific function to free up resources
(free work area) after the sequence is completed.
Work: The actual RTAS call specific function which collects
the data from the hypervisor.

Signed-off-by: Haren Myneni <haren@linux.ibm.com>
Tested-by: Sathvika Vasireddy <sv@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250416225743.596462-2-haren@linux.ibm.com

powerpc: enable dynamic preemption

Once the lazy preemption is supported, it would be desirable to change
the preemption models at runtime. So add support for dynamic preemption
using DYNAMIC_KEY.

::Tested lightly on Power10 LPAR
Performance numbers indicate that, preempt=none(no dynamic) and
preempt=none(dynamic) are close.

cat /sys/kernel/debug/sched/preempt
(none) voluntary full lazy
perf stat -e probe:__cond_resched -a sleep 1
Performance counter stats for 'system wide':
1,253 probe:__cond_resched

echo full > /sys/kernel/debug/sched/preempt
cat /sys/kernel/debug/sched/preempt
none voluntary (full) lazy
perf stat -e probe:__cond_resched -a sleep 1
Performance counter stats for 'system wide':
0 probe:__cond_resched

Signed-off-by: Shrikanth Hegde <sshegde@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250210184334.567383-2-sshegde@linux.ibm.com

fadump: Use str_yes_no() helper in fadump_show_config()

Remove hard-coded strings by using the str_yes_no() helper function.

Reviewed-by: Sourabh Jain <sourabhjain@linux.ibm.com>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250209081704.2758-2-thorsten.blum@linux.dev

KVM: powerpc: Enable commented out BUILD_BUG_ON() assertion

The BUILD_BUG_ON() assertion was commented out in commit 38634e676992
("powerpc/kvm: Remove problematic BUILD_BUG_ON statement") and fixed in
commit c0a187e12d48 ("KVM: powerpc: Fix BUILD_BUG_ON condition"), but
not enabled. Enable it now that this no longer breaks and remove the
comment.

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250411084222.6916-1-thorsten.blum@linux.dev

powerpc: mpic: Use str_enabled_disabled() helper function

Remove hard-coded strings by using the str_enabled_disabled() helper
function.

Use pr_debug() instead of printk(KERN_DEBUG) to silence a checkpatch
warning.

Reviewed-by: Ricardo B. Marlière <ricardo@marliere.net>
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250219112053.3352-2-thorsten.blum@linux.dev

powerpc/ps3: Use str_write_read() in ps3_notification_read_write()

Remove hard-coded strings by using the str_write_read() helper function.

Suggested-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250219111445.2875-2-thorsten.blum@linux.dev

powerpc/kvm-hv-pmu: Add perf-events for Hostwide counters

Update 'kvm-hv-pmu.c' to add five new perf-events mapped to the five
Hostwide counters. Since these newly introduced perf events are at system
wide scope and can be read from any L1-Lpar CPU, 'kvmppc_pmu' scope and
capabilities are updated appropriately.

Also introduce two new helpers. First is kvmppc_update_l0_stats() that uses
the infrastructure introduced in previous patches to issues the
H_GUEST_GET_STATE hcall L0-PowerVM to fetch guest-state-buffer holding the
latest values of these counters which is then parsed and 'l0_stats'
variable updated.

Second helper is kvmppc_pmu_event_update() which is called from
'kvmppv_pmu' callbacks and uses kvmppc_update_l0_stats() to update
'l0_stats' and the update the 'struct perf_event's event-counter.

Some minor updates to kvmppc_pmu_{add, del, read}() to remove some debug
scaffolding code.

Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Reviewed-by: Athira Rajeev <atrajeev@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250416162740.93143-7-vaibhav@linux.ibm.com

powerpc/kvm-hv-pmu: Implement GSB message-ops for hostwide counters

Implement and setup necessary structures to send a prepolulated
Guest-State-Buffer(GSB) requesting hostwide counters to L0-PowerVM and have
the returned GSB holding the values of these counters parsed. This is done
via existing GSB implementation and with the newly added support of
Hostwide elements in GSB.

The request to L0-PowerVM to return Hostwide counters is done using a
pre-allocated GSB named 'gsb_l0_stats'. To be able to populate this GSB
with the needed Guest-State-Elements (GSIDs) a instance of 'struct
kvmppc_gs_msg' named 'gsm_l0_stats' is introduced. The 'gsm_l0_stats' is
tied to an instance of 'struct kvmppc_gs_msg_ops' named 'gsb_ops_l0_stats'
which holds various callbacks to be compute the size ( hostwide_get_size()
), populate the GSB ( hostwide_fill_info() ) and
refresh ( hostwide_refresh_info() ) the contents of
'l0_stats' that holds the Hostwide counters returned from L0-PowerVM.

To protect these structures from simultaneous access a spinlock
'lock_l0_stats' has been introduced. The allocation and initialization of
the above structures is done in newly introduced kvmppc_init_hostwide() and
similarly the cleanup is performed in newly introduced
kvmppc_cleanup_hostwide().

Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250416162740.93143-6-vaibhav@linux.ibm.com

kvm powerpc/book3s-apiv2: Introduce kvm-hv specific PMU

Introduce a new PMU named 'kvm-hv' inside a new module named 'kvm-hv-pmu'
to report Book3s kvm-hv specific performance counters. This will expose
KVM-HV specific performance attributes to user-space via kernel's PMU
infrastructure and would enableusers to monitor active kvm-hv based guests.

The patch creates necessary scaffolding to for the new PMU callbacks and
introduces the new kernel module name 'kvm-hv-pmu' which is built with
CONFIG_KVM_BOOK3S_HV_PMU. The patch doesn't introduce any perf-events yet,
which will be introduced in later patches

Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250416162740.93143-5-vaibhav@linux.ibm.com

kvm powerpc/book3s-apiv2: Add kunit tests for Hostwide GSB elements

Update 'test-guest-state-buffer.c' to add two new KUNIT test cases for
validating correctness of changes to Guest-state-buffer management
infrastructure for adding support for Hostwide GSB elements.

The newly introduced test test_gs_hostwide_msg() checks if the Hostwide
elements can be set and parsed from a Guest-state-buffer. The second kunit
test test_gs_hostwide_counters() checks if the Hostwide GSB elements can be
send to the L0-PowerVM hypervisor via the H_GUEST_SET_STATE hcall and
ensures that the returned guest-state-buffer has all the 5 Hostwide stat
counters present.

Below is the KATP test report with the newly added KUNIT tests:

KTAP version 1
    # Subtest: guest_state_buffer_test
    # module: test_guest_state_buffer
    1..7
    ok 1 test_creating_buffer
    ok 2 test_adding_element
    ok 3 test_gs_bitmap
    ok 4 test_gs_parsing
    ok 5 test_gs_msg
    ok 6 test_gs_hostwide_msg
    # test_gs_hostwide_counters: Guest Heap Size=0 bytes
    # test_gs_hostwide_counters: Guest Heap Size Max=10995367936 bytes
    # test_gs_hostwide_counters: Guest Page-table Size=2178304 bytes
    # test_gs_hostwide_counters: Guest Page-table Size Max=2147483648 bytes
    # test_gs_hostwide_counters: Guest Page-table Reclaim Size=0 bytes
    ok 7 test_gs_hostwide_counters
# guest_state_buffer_test: pass:7 fail:0 skip:0 total:7
# Totals: pass:7 fail:0 skip:0 total:7
ok 1 guest_state_buffer_test

Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250416162740.93143-4-vaibhav@linux.ibm.com

kvm powerpc/book3s-apiv2: Add support for Hostwide GSB elements

Add support for adding and parsing Hostwide elements to the
Guest-state-buffer data structure used in apiv2. These elements are used to
share meta-information pertaining to entire L1-Lpar and this
meta-information is maintained by L0-PowerVM hypervisor. Example of this
include the amount of the page-table memory currently used by L0-PowerVM
for hosting the Shadow-Pagetable of all active L2-Guests. More of the are
documented in kernel-documentation at [1]. The Hostwide GSB elements are
currently only support with H_GUEST_SET_STATE hcall with a special flag
namely 'KVMPPC_GS_FLAGS_HOST_WIDE'.

The patch introduces new defs for the 5 new Hostwide GSB elements including
their GSIDs as well as introduces a new class of GSB elements namely
'KVMPPC_GS_CLASS_HOSTWIDE' to indicate to GSB construction/parsing
infrastructure in 'kvm/guest-state-buffer.c'. Also
gs_msg_ops_vcpu_get_size(), kvmppc_gsid_type() and
kvmppc_gse_{flatten,unflatten}_iden() are updated to appropriately indicate
the needed size for these Hostwide GSB elements as well as how to
flatten/unflatten their GSIDs so that they can be marked as available in
GSB bitmap.

[1] Documention/arch/powerpc/kvm-nested.rst

Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250416162740.93143-3-vaibhav@linux.ibm.com

powerpc: Document APIv2 KVM hcall spec for Hostwide counters

Update kvm-nested APIv2 documentation to include five new
Guest-State-Elements to fetch the hostwide counters. These counters are
per L1-Lpar and indicate the amount of Heap/Page-table memory allocated,
available and Page-table memory reclaimed for all L2-Guests active
instances

Reviewed-by: Bagas Sanjaya <bagasdotme@gmail.com>
Tested-by: Gautam Menghani <gautam@linux.ibm.com>
Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Signed-off-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Link: https://patch.msgid.link/20250416162740.93143-2-vaibhav@linux.ibm.com

Linux 6.15-rc2

Merge tag 'erofs-for-6.15-rc2-fixes' of git://git./linux/kernel/git/xiang/erofs

Pull erofs fixes from Gao Xiang:

- Properly handle errors when file-backed I/O fails

- Fix compilation issues on ARM platform (arm-linux-gnueabi)

- Fix parsing of encoded extents

- Minor cleanup

* tag 'erofs-for-6.15-rc2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/xiang/erofs:
  erofs: remove duplicate code
  erofs: fix encoded extents handling
  erofs: add __packed annotation to union(__le16..)
  erofs: set error to bio if file-backed IO fails

Merge tag 'ext4_for_linus-6.15-rc2' of git://git./linux/kernel/git/tytso/ext4

Pull ext4 fixes from Ted Ts'o:
"A few more miscellaneous ext4 bug fixes and cleanups including some
  syzbot failures and fixing a stale file handing refeencing an inode
  previously used as a regular file, but which has been deleted and
  reused as an ea_inode would result in ext4 erroneously considering
  this a case of fs corruption"

* tag 'ext4_for_linus-6.15-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4:
  ext4: fix off-by-one error in do_split
  ext4: make block validity check resistent to sb bh corruption
  ext4: avoid -Wflex-array-member-not-at-end warning
  Documentation: ext4: Add fields to ext4_super_block documentation
  ext4: don't treat fhandle lookup of ea_inode as FS corruption

Merge tag 'fixes-2025-04-13' of git://git./linux/kernel/git/rppt/memblock

Pull memblock fix from Mike Rapoport:
"Fix build of memblock test.

  Add missing stubs for mutex and free_reserved_area() to memblock
  tests"

* tag 'fixes-2025-04-13' of git://git.kernel.org/pub/scm/linux/kernel/git/rppt/memblock:
  memblock tests: Fix mutex related build error

ext4: fix off-by-one error in do_split

Syzkaller detected a use-after-free issue in ext4_insert_dentry that was
caused by out-of-bounds access due to incorrect splitting in do_split.

BUG: KASAN: use-after-free in ext4_insert_dentry+0x36a/0x6d0 fs/ext4/namei.c:2109
Write of size 251 at addr ffff888074572f14 by task syz-executor335/5847

CPU: 0 UID: 0 PID: 5847 Comm: syz-executor335 Not tainted 6.12.0-rc6-syzkaller-00318-ga9cda7c0ffed #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/30/2024
Call Trace:
<TASK>
__dump_stack lib/dump_stack.c:94 [inline]
dump_stack_lvl+0x241/0x360 lib/dump_stack.c:120
print_address_description mm/kasan/report.c:377 [inline]
print_report+0x169/0x550 mm/kasan/report.c:488
kasan_report+0x143/0x180 mm/kasan/report.c:601
kasan_check_range+0x282/0x290 mm/kasan/generic.c:189
__asan_memcpy+0x40/0x70 mm/kasan/shadow.c:106
ext4_insert_dentry+0x36a/0x6d0 fs/ext4/namei.c:2109
add_dirent_to_buf+0x3d9/0x750 fs/ext4/namei.c:2154
make_indexed_dir+0xf98/0x1600 fs/ext4/namei.c:2351
ext4_add_entry+0x222a/0x25d0 fs/ext4/namei.c:2455
ext4_add_nondir+0x8d/0x290 fs/ext4/namei.c:2796
ext4_symlink+0x920/0xb50 fs/ext4/namei.c:3431
vfs_symlink+0x137/0x2e0 fs/namei.c:4615
do_symlinkat+0x222/0x3a0 fs/namei.c:4641
__do_sys_symlink fs/namei.c:4662 [inline]
__se_sys_symlink fs/namei.c:4660 [inline]
__x64_sys_symlink+0x7a/0x90 fs/namei.c:4660
do_syscall_x64 arch/x86/entry/common.c:52 [inline]
do_syscall_64+0xf3/0x230 arch/x86/entry/common.c:83
entry_SYSCALL_64_after_hwframe+0x77/0x7f
</TASK>

The following loop is located right above 'if' statement.

for (i = count-1; i >= 0; i--) {
/* is more than half of this entry in 2nd half of the block? */
if (size + map[i].size/2 > blocksize/2)
break;
size += map[i].size;
move++;
}

'i' in this case could go down to -1, in which case sum of active entries
wouldn't exceed half the block size, but previous behaviour would also do
split in half if sum would exceed at the very last block, which in case of
having too many long name files in a single block could lead to
out-of-bounds access and following use-after-free.

Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

Cc: stable@vger.kernel.org
Fixes: 5872331b3d91 ("ext4: fix potential negative array index in do_split()")
Signed-off-by: Artem Sadovnikov <a.sadovnikov@ispras.ru>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20250404082804.2567-3-a.sadovnikov@ispras.ru
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

ext4: make block validity check resistent to sb bh corruption

Block validity checks need to be skipped in case they are called
for journal blocks since they are part of system's protected
zone.

Currently, this is done by checking inode->ino against
sbi->s_es->s_journal_inum, which is a direct read from the ext4 sb
buffer head. If someone modifies this underneath us then the
s_journal_inum field might get corrupted. To prevent against this,
change the check to directly compare the inode with journal->j_inode.

**Slight change in behavior**: During journal init path,
check_block_validity etc might be called for journal inode when
sbi->s_journal is not set yet. In this case we now proceed with
ext4_inode_block_valid() instead of returning early. Since systems zones
have not been set yet, it is okay to proceed so we can perform basic
checks on the blocks.

Suggested-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Baokun Li <libaokun1@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Zhang Yi <yi.zhang@huawei.com>
Signed-off-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Link: https://patch.msgid.link/0c06bc9ebfcd6ccfed84a36e79147bf45ff5adc1.1743142920.git.ojaswin@linux.ibm.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

ext4: avoid -Wflex-array-member-not-at-end warning

-Wflex-array-member-not-at-end was introduced in GCC-14, and we are
getting ready to enable it, globally.

Use the `DEFINE_RAW_FLEX()` helper for an on-stack definition of
a flexible structure where the size of the flexible-array member
is known at compile-time, and refactor the rest of the code,
accordingly.

So, with these changes, fix the following warning:

fs/ext4/mballoc.c:3041:40: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]

Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org>
Reviewed-by: Kees Cook <kees@kernel.org>
Link: https://patch.msgid.link/Z-SF97N3AxcIMlSi@kspp
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

Documentation: ext4: Add fields to ext4_super_block documentation

Documentation and implementation of the ext4 super block have
slightly diverged: Padding has been removed in order to make room for
new fields that are still missing in the documentation.

Add the new fields s_encryption_level, s_first_error_errorcode,
s_last_error_errorcode to the documentation of the ext4 super block.

Fixes: f542fbe8d5e8 ("ext4 crypto: reserve codepoints used by the ext4 encryption feature")
Fixes: 878520ac45f9 ("ext4: save the error code which triggered an ext4_error() in the superblock")

Signed-off-by: Tom Vierjahn <tom.vierjahn@acm.org>
Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Link: https://patch.msgid.link/20250324221004.5268-1-tom.vierjahn@acm.org
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

Merge tag 'trace-v6.15-rc1' of git://git./linux/kernel/git/trace/linux-trace

Pull tracing fixes from Steven Rostedt:

- Hide get_vm_area() from MMUless builds

   The function get_vm_area() is not defined when CONFIG_MMU is not
   defined. Hide that function within #ifdef CONFIG_MMU.

- Fix output of synthetic events when they have dynamic strings

   The print fmt of the synthetic event's format file use to have "%.*s"
   for dynamic size strings even though the user space exported
   arguments had only __get_str() macro that provided just a nul
   terminated string. This was fixed so that user space could parse this
   properly.

   But the reason that it had "%.*s" was because internally it provided
   the maximum size of the string as one of the arguments. The fix that
   replaced "%.*s" with "%s" caused the trace output (when the kernel
   reads the event) to write "(efault)" as it would now read the length
   of the string as "%s".

   As the string provided is always nul terminated, there's no reason
   for the internal code to use "%.*s" anyway. Just remove the length
   argument to match the "%s" that is now in the format.

- Fix the ftrace subops hash logic of the manager ops hash

   The function_graph uses the ftrace subops code. The subops code is a
   way to have a single ftrace_ops registered with ftrace to determine
   what functions will call the ftrace_ops callback. More than one user
   of function graph can register a ftrace_ops with it. The function
   graph infrastructure will then add this ftrace_ops as a subops with
   the main ftrace_ops it registers with ftrace. This is because the
   functions will always call the function graph callback which in turn
   calls the subops ftrace_ops callbacks.

   The main ftrace_ops must add a callback to all the functions that the
   subops want a callback from. When a subops is registered, it will
   update the main ftrace_ops hash to include the functions it wants.
   This is the logic that was broken.

   The ftrace_ops hash has a "filter_hash" and a "notrace_hash" where
   all the functions in the filter_hash but not in the notrace_hash are
   attached by ftrace. The original logic would have the main ftrace_ops
   filter_hash be a union of all the subops filter_hashes and the main
   notrace_hash would be a intersect of all the subops filter hashes.
   But this was incorrect because the notrace hash depends on the
   filter_hash it is associated to and not the union of all
   filter_hashes.

   Instead, when a subops is added, just include all the functions of
   the subops hash that are in its filter_hash but not in its
   notrace_hash. The main subops hash should not use its notrace hash,
   unless all of its subops hashes have an empty filter_hash (which
   means to attach to all functions), and then, and only then, the main
   ftrace_ops notrace hash can be the intersect of all the subops
   hashes.

   This not only fixes the bug, but also simplifies the code.

- Add a selftest to better test the subops filtering

   Add a selftest that would catch the bug fixed by the above change.

- Fix extra newline printed in function tracing with retval

   The function parameter code changed the output logic slightly and
   called print_graph_retval() and also printed a newline. The
   print_graph_retval() also prints a newline which caused blank lines
   to be printed in the function graph tracer when retval was added.
   This caused one of the selftests to fail if retvals were enabled.
   Instead remove the new line output from print_graph_retval() and have
   the callers always print the new line so that it doesn't have to do
   special logic if it calls print_graph_retval() or not.

- Fix out-of-bound memory access in the runtime verifier

   When rv_is_container_monitor() is called on the last entry on the
   link list it references the next entry, which is the list head and
   causes an out-of-bound memory access.

* tag 'trace-v6.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  rv: Fix out-of-bound memory access in rv_is_container_monitor()
  ftrace: Do not have print_graph_retval() add a newline
  tracing/selftest: Add test to better test subops filtering of function graph
  ftrace: Fix accounting of subop hashes
  ftrace: Properly merge notrace hashes
  tracing: Do not add length to print format in synthetic events
  tracing: Hide get_vm_area() from MMUless builds

Merge tag 'bpf-fixes' of git://git./linux/kernel/git/bpf/bpf

Pull bpf fixes from Alexei Starovoitov:

- Followup fixes for resilient spinlock (Kumar Kartikeya Dwivedi):
     - Make res_spin_lock test less verbose, since it was spamming BPF
       CI on failure, and make the check for AA deadlock stronger
     - Fix rebasing mistake and use architecture provided
       res_smp_cond_load_acquire
     - Convert BPF maps (queue_stack and ringbuf) to resilient spinlock
       to address long standing syzbot reports

- Make sure that classic BPF load instruction from SKF_[NET|LL]_OFF
   offsets works when skb is fragmeneted (Willem de Bruijn)

* tag 'bpf-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf:
  bpf: Convert ringbuf map to rqspinlock
  bpf: Convert queue_stack map to rqspinlock
  bpf: Use architecture provided res_smp_cond_load_acquire
  selftests/bpf: Make res_spin_lock AA test condition stronger
  selftests/net: test sk_filter support for SKF_NET_OFF on frags
  bpf: support SKF_NET_OFF and SKF_LL_OFF on skb frags
  selftests/bpf: Make res_spin_lock test less verbose

rv: Fix out-of-bound memory access in rv_is_container_monitor()

When rv_is_container_monitor() is called on the last monitor in
rv_monitors_list, KASAN yells:

  BUG: KASAN: global-out-of-bounds in rv_is_container_monitor+0x101/0x110
  Read of size 8 at addr ffffffff97c7c798 by task setup/221

  The buggy address belongs to the variable:
   rv_monitors_list+0x18/0x40

This is due to list_next_entry() is called on the last entry in the list.
It wraps around to the first list_head, and the first list_head is not
embedded in struct rv_monitor_def.

Fix it by checking if the monitor is last in the list.

Cc: stable@vger.kernel.org
Cc: Gabriele Monaco <gmonaco@redhat.com>
Fixes: cb85c660fcd4 ("rv: Add option for nested monitors and include sched")
Link: https://lore.kernel.org/e85b5eeb7228bfc23b8d7d4ab5411472c54ae91b.1744355018.git.namcao@linutronix.de
Signed-off-by: Nam Cao <namcao@linutronix.de>
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

ftrace: Do not have print_graph_retval() add a newline

The retval and retaddr options for function_graph tracer will add a
comment at the end of a function for both leaf and non leaf functions that
looks like:

__wake_up_common(); /* ret=0x1 */

} /* pick_next_task_fair ret=0x0 */

The function print_graph_retval() adds a newline after the "*/". But if
that's not called, the caller function needs to make sure there's a
newline added.

This is confusing and when the function parameters code was added, it
added a newline even when calling print_graph_retval() as the fact that
the print_graph_retval() function prints a newline isn't obvious.

This caused an extra newline to be printed and that made it fail the
selftests when the retval option was set, as the selftests were not
expecting blank lines being injected into the trace.

Instead of having print_graph_retval() print a newline, just have the
caller always print the newline regardless if it calls print_graph_retval()
or not. This not only fixes this bug, but it also simplifies the code.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/20250411133015.015ca393@gandalf.local.home
Reported-by: Mark Brown <broonie@kernel.org>
Tested-by: Mark Brown <broonie@kernel.org>
Closes: https://lore.kernel.org/all/ccc40f2b-4b9e-4abd-8daf-d22fce2a86f0@sirena.org.uk/
Fixes: ff5c9c576e754 ("ftrace: Add support for function argument to graph tracer")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

Merge tag 'pwm/for-6.15-rc2-fixes' of git://git./linux/kernel/git/ukleinek/linux

Pull pwm fixes from Uwe Kleine-König:
"A set of fixes for pwm core and various drivers

  The first three patches handle clk_get_rate() returning 0 (which might
  happen for example if the CCF is disabled). The first of these was
  found because this triggered a warning with clang, the two others by
  looking for similar issues in other drivers.

  The remaining three fixes address issues in the new waveform pwm API.
  Now that I worked on this a bit more, the finer details and corner
  cases are better understood and the code is fixed accordingly"

* tag 'pwm/for-6.15-rc2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/ukleinek/linux:
  pwm: axi-pwmgen: Let .round_waveform_tohw() signal when request was rounded up
  pwm: stm32: Search an appropriate duty_cycle if period cannot be modified
  pwm: Let pwm_set_waveform() succeed even if lowlevel driver rounded up
  pwm: fsl-ftm: Handle clk_get_rate() returning 0
  pwm: rcar: Improve register calculation
  pwm: mediatek: Prevent divide-by-zero in pwm_mediatek_config()

Merge tag 'v6.15-rc1-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6

Pull smb client fixes from Steve French:

- Fix multichannel decryption UAF

- Fix regression mounting to onedrive shares

- Fix missing mount option check for posix vs. noposix

- Fix version field in WSL symlinks

- Three minor cleanup to reparse point handling

- SMB1 fix for WSL special files

- SMB1 Kerberos fix

- Add SMB3 defines for two new FS attributes

* tag 'v6.15-rc1-smb3-client-fixes' of git://git.samba.org/sfrench/cifs-2.6:
  smb3: Add defines for two new FileSystemAttributes
  cifs: Fix querying of WSL CHR and BLK reparse points over SMB1
  cifs: Split parse_reparse_point callback to functions: get buffer and parse buffer
  cifs: Improve handling of name surrogate reparse points in reparse.c
  cifs: Remove explicit handling of IO_REPARSE_TAG_MOUNT_POINT in inode.c
  cifs: Fix encoding of SMB1 Session Setup Kerberos Request in non-UNICODE mode
  smb: client: fix UAF in decryption with multichannel
  cifs: Fix support for WSL-style symlinks
  smb311 client: fix missing tcon check when mounting with linux/posix extensions
  cifs: Ensure that all non-client-specific reparse points are processed by the server

Merge tag 'pci-v6.15-fixes-1' of git://git./linux/kernel/git/pci/pci

Pull pci fix from Bjorn Helgaas:

- Run quirk_huawei_pcie_sva() before arm_smmu_probe_device(), which
   depends on the quirk, to avoid IOMMU initialization failures
   (Zhangfei Gao)

* tag 'pci-v6.15-fixes-1' of git://git.kernel.org/pub/scm/linux/kernel/git/pci/pci:
  PCI: Run quirk_huawei_pcie_sva() before arm_smmu_probe_device()

tracing/selftest: Add test to better test subops filtering of function graph

A bug was discovered that showed the accounting of the subops of the
ftrace_ops filtering was incorrect. Add a new test to better test the
filtering.

This test creates two instances, where it will add various filters to both
the set_ftrace_filter and the set_ftrace_notrace files and enable
function_graph. Then it looks into the enabled_functions file to make sure
that the filters are behaving correctly.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Andy Chiu <andybnac@gmail.com>
Link: https://lore.kernel.org/20250409152720.380778379@goodmis.org
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

ftrace: Fix accounting of subop hashes

The function graph infrastructure uses ftrace to hook to functions. It has
a single ftrace_ops to manage all the users of function graph. Each
individual user (tracing, bpf, fprobes, etc) has its own ftrace_ops to
track the functions it will have its callback called from. These
ftrace_ops are "subops" to the main ftrace_ops of the function graph
infrastructure.

Each ftrace_ops has a filter_hash and a notrace_hash that is defined as:

  Only trace functions that are in the filter_hash but not in the
  notrace_hash.

If the filter_hash is empty, it means to trace all functions.
If the notrace_hash is empty, it means do not disable any function.

The function graph main ftrace_ops needs to be a superset containing all
the functions to be traced by all the subops it has. The algorithm to
perform this merge was incorrect.

When the first subops was added to the main ops, it simply made the main
ops a copy of the subops (same filter_hash and notrace_hash).

When a second ops was added, it joined the new subops filter_hash with the
main ops filter_hash as a union of the two sets. The intersect between the
new subops notrace_hash and the main ops notrace_hash was created as the
new notrace_hash of the main ops.

The issue here is that it would then start tracing functions than no
subops were tracing. For example if you had two subops that had:

subops 1:

  filter_hash = '*sched*' # trace all functions with "sched" in it
  notrace_hash = '*time*' # except do not trace functions with "time"

subops 2:

  filter_hash = '*lock*' # trace all functions with "lock" in it
  notrace_hash = '*clock*' # except do not trace functions with "clock"

The intersect of '*time*' functions with '*clock*' functions could be the
empty set. That means the main ops will be tracing all functions with
'*time*' and all "*clock*" in it!

Instead, modify the algorithm to be a bit simpler and correct.

First, when adding a new subops, even if it's the first one, do not add
the notrace_hash if the filter_hash is not empty. Instead, just add the
functions that are in the filter_hash of the subops but not in the
notrace_hash of the subops into the main ops filter_hash. There's no
reason to add anything to the main ops notrace_hash.

The notrace_hash of the main ops should only be non empty iff all subops
filter_hashes are empty (meaning to trace all functions) and all subops
notrace_hashes include the same functions.

That is, the main ops notrace_hash is empty if any subops filter_hash is
non empty.

The main ops notrace_hash only has content in it if all subops
filter_hashes are empty, and the content are only functions that intersect
all the subops notrace_hashes. If any subops notrace_hash is empty, then
so is the main ops notrace_hash.

Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Shuah Khan <skhan@linuxfoundation.org>
Cc: Andy Chiu <andybnac@gmail.com>
Link: https://lore.kernel.org/20250409152720.216356767@goodmis.org
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

ftrace: Properly merge notrace hashes

The global notrace hash should be jointly decided by the intersection of
each subops's notrace hash, but not the filter hash.

Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/20250408160258.48563-1-andybnac@gmail.com
Fixes: 5fccc7552ccb ("ftrace: Add subops logic to allow one ops to manage many")
Signed-off-by: Andy Chiu <andybnac@gmail.com>
[ fixed removing of freeing of filter_hash ]
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

PCI: Run quirk_huawei_pcie_sva() before arm_smmu_probe_device()

quirk_huawei_pcie_sva() sets properties needed by arm_smmu_probe_device(),
but bcb81ac6ae3c ("iommu: Get DT/ACPI parsing into the proper probe path")
changed the iommu_probe_device() flow so arm_smmu_probe_device() is now
invoked before the quirk, leading to failures like this:

  reg-dummy reg-dummy: late IOMMU probe at driver bind, something fishy here!
  WARNING: CPU: 0 PID: 1 at drivers/iommu/iommu.c:449 __iommu_probe_device+0x140/0x570
  RIP: 0010:__iommu_probe_device+0x140/0x570

The SR-IOV enumeration ordering changes like this:

  pci_iov_add_virtfn
    pci_device_add
      pci_fixup_device(pci_fixup_header)      <--
      device_add
        bus_notify
          iommu_bus_notifier
  +         iommu_probe_device
  +           arm_smmu_probe_device
    pci_bus_add_device
      pci_fixup_device(pci_fixup_final)       <--
      device_attach
        driver_probe_device
          really_probe
            pci_dma_configure
              acpi_dma_configure_id
  -             iommu_probe_device
  -               arm_smmu_probe_device

The non-SR-IOV case is similar in that pci_device_add() is called from
pci_scan_single_device() in the generic enumeration path and
pci_bus_add_device() is called later, after all host bridges have been
enumerated.

Declare quirk_huawei_pcie_sva() as a header fixup to ensure that it happens
before arm_smmu_probe_device().

Fixes: bcb81ac6ae3c ("iommu: Get DT/ACPI parsing into the proper probe path")
Reported-by: Chaitanya Kumar Borah <chaitanya.kumar.borah@intel.com>
Closes: https://lore.kernel.org/all/SJ1PR11MB61295DE21A1184AEE0786E25B9D22@SJ1PR11MB6129.namprd11.prod.outlook.com/
Signed-off-by: Zhangfei Gao <zhangfei.gao@linaro.org>
[bhelgaas: commit log, add failure info and reporter]
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Link: https://patch.msgid.link/20250317011352.5806-1-zhangfei.gao@linaro.org

bpf: Convert ringbuf map to rqspinlock

Convert the raw spinlock used by BPF ringbuf to rqspinlock. Currently,
we have an open syzbot report of a potential deadlock. In addition, the
ringbuf can fail to reserve spuriously under contention from NMI
context.

It is potentially attractive to enable unconstrained usage (incl. NMIs)
while ensuring no deadlocks manifest at runtime, perform the conversion
to rqspinlock to achieve this.

This change was benchmarked for BPF ringbuf's multi-producer contention
case on an Intel Sapphire Rapids server, with hyperthreading disabled
and performance governor turned on. 5 warm up runs were done for each
case before obtaining the results.

Before (raw_spinlock_t):

Ringbuf, multi-producer contention
==================================
rb-libbpf nr_prod 1  11.440 ± 0.019M/s (drops 0.000 ± 0.000M/s)
rb-libbpf nr_prod 2  2.706 ± 0.010M/s (drops 0.000 ± 0.000M/s)
rb-libbpf nr_prod 3  3.130 ± 0.004M/s (drops 0.000 ± 0.000M/s)
rb-libbpf nr_prod 4  2.472 ± 0.003M/s (drops 0.000 ± 0.000M/s)
rb-libbpf nr_prod 8  2.352 ± 0.001M/s (drops 0.000 ± 0.000M/s)
rb-libbpf nr_prod 12 2.813 ± 0.001M/s (drops 0.000 ± 0.000M/s)
rb-libbpf nr_prod 16 1.988 ± 0.001M/s (drops 0.000 ± 0.000M/s)
rb-libbpf nr_prod 20 2.245 ± 0.001M/s (drops 0.000 ± 0.000M/s)
rb-libbpf nr_prod 24 2.148 ± 0.001M/s (drops 0.000 ± 0.000M/s)
rb-libbpf nr_prod 28 2.190 ± 0.001M/s (drops 0.000 ± 0.000M/s)
rb-libbpf nr_prod 32 2.490 ± 0.001M/s (drops 0.000 ± 0.000M/s)
rb-libbpf nr_prod 36 2.180 ± 0.001M/s (drops 0.000 ± 0.000M/s)
rb-libbpf nr_prod 40 2.201 ± 0.001M/s (drops 0.000 ± 0.000M/s)
rb-libbpf nr_prod 44 2.226 ± 0.001M/s (drops 0.000 ± 0.000M/s)
rb-libbpf nr_prod 48 2.164 ± 0.001M/s (drops 0.000 ± 0.000M/s)
rb-libbpf nr_prod 52 1.874 ± 0.001M/s (drops 0.000 ± 0.000M/s)

After (rqspinlock_t):

Ringbuf, multi-producer contention
==================================
rb-libbpf nr_prod 1  11.078 ± 0.019M/s (drops 0.000 ± 0.000M/s) (-3.16%)
rb-libbpf nr_prod 2  2.801 ± 0.014M/s (drops 0.000 ± 0.000M/s) (3.51%)
rb-libbpf nr_prod 3  3.454 ± 0.005M/s (drops 0.000 ± 0.000M/s) (10.35%)
rb-libbpf nr_prod 4  2.567 ± 0.002M/s (drops 0.000 ± 0.000M/s) (3.84%)
rb-libbpf nr_prod 8  2.468 ± 0.001M/s (drops 0.000 ± 0.000M/s) (4.93%)
rb-libbpf nr_prod 12 2.510 ± 0.001M/s (drops 0.000 ± 0.000M/s) (-10.77%)
rb-libbpf nr_prod 16 2.075 ± 0.001M/s (drops 0.000 ± 0.000M/s) (4.38%)
rb-libbpf nr_prod 20 2.640 ± 0.001M/s (drops 0.000 ± 0.000M/s) (17.59%)
rb-libbpf nr_prod 24 2.092 ± 0.001M/s (drops 0.000 ± 0.000M/s) (-2.61%)
rb-libbpf nr_prod 28 2.426 ± 0.005M/s (drops 0.000 ± 0.000M/s) (10.78%)
rb-libbpf nr_prod 32 2.331 ± 0.004M/s (drops 0.000 ± 0.000M/s) (-6.39%)
rb-libbpf nr_prod 36 2.306 ± 0.003M/s (drops 0.000 ± 0.000M/s) (5.78%)
rb-libbpf nr_prod 40 2.178 ± 0.002M/s (drops 0.000 ± 0.000M/s) (-1.04%)
rb-libbpf nr_prod 44 2.293 ± 0.001M/s (drops 0.000 ± 0.000M/s) (3.01%)
rb-libbpf nr_prod 48 2.022 ± 0.001M/s (drops 0.000 ± 0.000M/s) (-6.56%)
rb-libbpf nr_prod 52 1.809 ± 0.001M/s (drops 0.000 ± 0.000M/s) (-3.47%)

There's a fair amount of noise in the benchmark, with numbers on reruns
going up and down by 10%, so all changes are in the range of this
disturbance, and we see no major regressions.

Reported-by: syzbot+850aaf14624dc0c6d366@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/all/0000000000004aa700061379547e@google.com
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20250411101759.4061366-1-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

Merge tag 'spi-fix-v6.15-rc1' of git://git./linux/kernel/git/broonie/spi

Pull spi fixes from Mark Brown:
"A couple of cleanups for the error handling in the Freescale drivers"

* tag 'spi-fix-v6.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/broonie/spi:
spi: fsl-spi: Remove redundant probe error message
spi: fsl-qspi: Fix double cleanup in probe error path

Merge tag 'ata-6.15-rc2' of git://git./linux/kernel/git/libata/linux

Pull ata fixes from Damien Le Moal:

- Fix missing error checks during controller probe in the sata_sx4
   driver (Wentao)

- Fix missing error checks during controller probe in the pata_pxa
   driver (Henry)

* tag 'ata-6.15-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/libata/linux:
  ata: sata_sx4: Add error handling in pdc20621_i2c_read()
  ata: pata_pxa: Fix potential NULL pointer dereference in pxa_ata_probe()

Merge tag 'block-6.15-20250411' of git://git.kernel.dk/linux

Pull more block fixes from Jens Axboe:
"Apparently my internal clock was off, or perhaps it was just wishful
  thinking, but I sent out block fixes yesterday as my brain assumed it
  was Friday. Subsequently, that missed the NVMe fixes that should go
  into this weeks release as well. Hence, here's a followup with those,
  and another simple fix.

   - NVMe pull request via Christoph:
       - nvmet fc/fcloop refcounting fixes (Daniel Wagner)
       - fix missed namespace/ANA scans (Hannes Reinecke)
       - fix a use after free in the new TCP netns support (Kuniyuki
         Iwashima)
       - fix a NULL instead of false review in multipath (Uday Shankar)

   - Use strscpy() for null_blk disk name copy"

* tag 'block-6.15-20250411' of git://git.kernel.dk/linux:
  null_blk: Use strscpy() instead of strscpy_pad() in null_add_dev()
  nvmet-fc: put ref when assoc->del_work is already scheduled
  nvmet-fc: take tgtport reference only once
  nvmet-fc: update tgtport ref per assoc
  nvmet-fc: inline nvmet_fc_free_hostport
  nvmet-fc: inline nvmet_fc_delete_assoc
  nvmet-fcloop: add ref counting to lport
  nvmet-fcloop: replace kref with refcount
  nvmet-fcloop: swap list_add_tail arguments
  nvme-tcp: fix use-after-free of netns by kernel TCP socket.
  nvme: multipath: fix return value of nvme_available_path
  nvme: re-read ANA log page after ns scan completes
  nvme: requeue namespace scan on missed AENs

Merge tag 'iommu-fixes-v6.15-rc1' of git://git./linux/kernel/git/iommu/linux

Pull iommu fixes from Joerg Roedel:

- Fix two crashes, one in core code and a NULL-ptr dereference in the
   Mediatek IOMMU driver

- Dma_ops cleanup fix for core code

- Two fixes for Intel VT-d driver:
     - Fix posted MSI issue when users change cpu affinity
     - Remove invalid set_dma_ops() call in the iommu driver

- Warning fix for Tegra IOMMU driver

- Suspend/Resume fix for Exynos IOMMU driver

- Probe failure fix for Renesas IOMMU driver

- Cosmetic fix

* tag 'iommu-fixes-v6.15-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/iommu/linux:
  iommu/tegra241-cmdqv: Fix warnings due to dmam_free_coherent()
  iommu: remove unneeded semicolon
  iommu/mediatek: Fix NULL pointer deference in mtk_iommu_device_group
  iommu/exynos: Fix suspend/resume with IDENTITY domain
  iommu/ipmmu-vmsa: Register in a sensible order
  iommu: Clear iommu-dma ops on cleanup
  iommu/vt-d: Remove an unnecessary call set_dma_ops()
  iommu/vt-d: Wire up irq_ack() to irq_move_irq() for posted MSIs
  iommu: Fix crash in report_iommu_fault()

Merge tag 'acpi-6.15-rc2' of git://git./linux/kernel/git/rafael/linux-pm

Pull ACPI fixes from Rafael Wysocki:
"These fix a recent regression in the ACPI button driver, add quirks
  related to EC wakeups from suspend-to-idle and fix coding mistakes
  related to the usage of sizeof() in the PPTT parser code:

  Summary:

   - Add suspend-to-idle EC wakeup quirks for Lenovo Go S (Mario
     Limonciello)

   - Prevent ACPI button from sending spurions KEY_POWER events to user
     space in some cases after a recent update (Mario Limonciello)

   - Compute the size of a structure instead of the size of a pointer in
     two places in the PPTT parser code (Jean-Marc Eurin)"

* tag 'acpi-6.15-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  ACPI PPTT: Fix coding mistakes in a couple of sizeof() calls
  ACPI: EC: Set ec_no_wakeup for Lenovo Go S
  ACPI: button: Only send `KEY_POWER` for `ACPI_BUTTON_NOTIFY_STATUS`

Merge tag 's390-6.15-3' of git://git./linux/kernel/git/s390/linux

Pull s390 updates from Heiko Carstens:
"Note that besides two bug fixes this includes three commits for IBM
  z17, which was announced this week.

   - Add IBM z17 bits:
       - Setup elf_platform for new machine types
       - Allow to compile the kernel with z17 optimizations
       - Add new performance counters

   - Fix mismatch between indicator bits and queue indexes in virtio CCW code

   - Fix double free in pmu setup error path"

* tag 's390-6.15-3' of git://git.kernel.org/pub/scm/linux/kernel/git/s390/linux:
  s390/cpumf: Fix double free on error in cpumf_pmu_event_init()
  s390/cpumf: Update CPU Measurement facility extended counter set support
  s390: Allow to compile with z17 optimizations
  s390: Add z17 elf platform
  s390/virtio_ccw: Don't allocate/assign airqs for non-existing queues

Merge branches 'acpi-ec' and 'acpi-button'

Merge updates of the ACPI EC and button drivers for 6.15-rc2:

- Add suspend-to-idle EC wakeup quirks for Lenovo Go S (Mario
   Limonciello).

- Prevent ACPI button from sending spurions KEY_POWER events to user
   space in some cases after a recent update (Mario Limonciello).

* acpi-ec:
  ACPI: EC: Set ec_no_wakeup for Lenovo Go S

* acpi-button:
  ACPI: button: Only send `KEY_POWER` for `ACPI_BUTTON_NOTIFY_STATUS`

null_blk: Use strscpy() instead of strscpy_pad() in null_add_dev()

blk_mq_alloc_disk() already zero-initializes the destination buffer,
making strscpy() sufficient for safely copying the disk's name. The
additional NUL-padding performed by strscpy_pad() is unnecessary.

If the destination buffer has a fixed length, strscpy() automatically
determines its size using sizeof() when the argument is omitted. This
makes the explicit size argument unnecessary.

The source string is also NUL-terminated and meets the __must_be_cstr()
requirement of strscpy().

No functional changes intended.

Signed-off-by: Thorsten Blum <thorsten.blum@linux.dev>
Reviewed-by: Zhu Yanjun <yanjun.zhu@linux.dev>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Link: https://lore.kernel.org/r/20250410154727.883207-1-thorsten.blum@linux.dev
Signed-off-by: Jens Axboe <axboe@kernel.dk>

iommu/tegra241-cmdqv: Fix warnings due to dmam_free_coherent()

Two WARNINGs are observed when SMMU driver rolls back upon failure:
arm-smmu-v3.9.auto: Failed to register iommu
arm-smmu-v3.9.auto: probe with driver arm-smmu-v3 failed with error -22
------------[ cut here ]------------
WARNING: CPU: 5 PID: 1 at kernel/dma/mapping.c:74 dmam_free_coherent+0xc0/0xd8
Call trace:
  dmam_free_coherent+0xc0/0xd8 (P)
  tegra241_vintf_free_lvcmdq+0x74/0x188
  tegra241_cmdqv_remove_vintf+0x60/0x148
  tegra241_cmdqv_remove+0x48/0xc8
  arm_smmu_impl_remove+0x28/0x60
  devm_action_release+0x1c/0x40
------------[ cut here ]------------
128 pages are still in use!
WARNING: CPU: 16 PID: 1 at mm/page_alloc.c:6902 free_contig_range+0x18c/0x1c8
Call trace:
  free_contig_range+0x18c/0x1c8 (P)
  cma_release+0x154/0x2f0
  dma_free_contiguous+0x38/0xa0
  dma_direct_free+0x10c/0x248
  dma_free_attrs+0x100/0x290
  dmam_free_coherent+0x78/0xd8
  tegra241_vintf_free_lvcmdq+0x74/0x160
  tegra241_cmdqv_remove+0x98/0x198
  arm_smmu_impl_remove+0x28/0x60
  devm_action_release+0x1c/0x40

This is because the LVCMDQ queue memory are managed by devres, while that
dmam_free_coherent() is called in the context of devm_action_release().

Jason pointed out that "arm_smmu_impl_probe() has mis-ordered the devres
callbacks if ops->device_remove() is going to be manually freeing things
that probe allocated":
https://lore.kernel.org/linux-iommu/20250407174408.GB1722458@nvidia.com/

In fact, tegra241_cmdqv_init_structures() only allocates memory resources
which means any failure that it generates would be similar to -ENOMEM, so
there is no point in having that "falling back to standard SMMU" routine,
as the standard SMMU would likely fail to allocate memory too.

Remove the unwind part in tegra241_cmdqv_init_structures(), and return a
proper error code to ask SMMU driver to call tegra241_cmdqv_remove() via
impl_ops->device_remove(). Then, drop tegra241_vintf_free_lvcmdq() since
devres will take care of that.

Fixes: 483e0bd8883a ("iommu/tegra241-cmdqv: Do not allocate vcmdq until dma_set_mask_and_coherent")
Cc: stable@vger.kernel.org
Suggested-by: Jason Gunthorpe <jgg@nvidia.com>
Signed-off-by: Nicolin Chen <nicolinc@nvidia.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20250407201908.172225-1-nicolinc@nvidia.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

iommu: remove unneeded semicolon

cocci warnings:
drivers/iommu/dma-iommu.c:1788:2-3: Unneeded semicolon

so remove unneeded semicolon to fix cocci warnings.

Signed-off-by: Pei Xiao <xiaopei01@kylinos.cn>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/tencent_73EEE47E6ECCF538229C9B9E6A0272DA2B05@qq.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

iommu/mediatek: Fix NULL pointer deference in mtk_iommu_device_group

Currently, mtk_iommu calls during probe iommu_device_register before
the hw_list from driver data is initialized. Since iommu probing issue
fix, it leads to NULL pointer dereference in mtk_iommu_device_group when
hw_list is accessed with list_first_entry (not null safe).

So, change the call order to ensure iommu_device_register is called
after the driver data are initialized.

Fixes: 9e3a2a643653 ("iommu/mediatek: Adapt sharing and non-sharing pgtable case")
Fixes: bcb81ac6ae3c ("iommu: Get DT/ACPI parsing into the proper probe path")
Reviewed-by: Yong Wu <yong.wu@mediatek.com>
Tested-by: Chen-Yu Tsai <wenst@chromium.org> # MT8183 Juniper, MT8186 Tentacruel
Reviewed-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Tested-by: AngeloGioacchino Del Regno <angelogioacchino.delregno@collabora.com>
Signed-off-by: Louis-Alexis Eyraud <louisalexis.eyraud@collabora.com>
Link: https://lore.kernel.org/r/20250403-fix-mtk-iommu-error-v2-1-fe8b18f8b0a8@collabora.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

iommu/exynos: Fix suspend/resume with IDENTITY domain

Commit bcb81ac6ae3c ("iommu: Get DT/ACPI parsing into the proper probe
path") changed the sequence of probing the SYSMMU controller devices and
calls to arm_iommu_attach_device(), what results in resuming SYSMMU
controller earlier, when it is still set to IDENTITY mapping. Such change
revealed the bug in IDENTITY handling in the exynos-iommu driver. When
SYSMMU controller is set to IDENTITY mapping, data->domain is NULL, so
adjust checks in suspend & resume callbacks to handle this case
correctly.

Fixes: b3d14960e629 ("iommu/exynos: Implement an IDENTITY domain")
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20250401202731.2810474-1-m.szyprowski@samsung.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

iommu/ipmmu-vmsa: Register in a sensible order

IPMMU registers almost-initialised instances, but misses assigning the
drvdata to make them fully functional, so initial calls back into
ipmmu_probe_device() are likely to fail unnecessarily. Reorder this to
work as it should, also pruning the long-out-of-date comment and adding
the missing sysfs cleanup on error for good measure.

Reported-by: Geert Uytterhoeven <geert@linux-m68k.org>
Fixes: bcb81ac6ae3c ("iommu: Get DT/ACPI parsing into the proper probe path")
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Tested-by: Geert Uytterhoeven <geert+renesas@glider.be>
Reviewed-by: Geert Uytterhoeven <geert+renesas@glider.be>
Link: https://lore.kernel.org/r/53be6667544de65a15415b699e38a9a965692e45.1742481687.git.robin.murphy@arm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

iommu: Clear iommu-dma ops on cleanup

If iommu_device_register() encounters an error, it can end up tearing
down already-configured groups and default domains, however this
currently still leaves devices hooked up to iommu-dma (and even
historically the behaviour in this area was at best inconsistent across
architectures/drivers...) Although in the case that an IOMMU is present
whose driver has failed to probe, users cannot necessarily expect DMA to
work anyway, it's still arguable that we should do our best to put
things back as if the IOMMU driver was never there at all, and certainly
the potential for crashing in iommu-dma itself is undesirable. Make sure
we clean up the dev->dma_iommu flag along with everything else.

Reported-by: Chen-Yu Tsai <wenst@chromium.org>
Signed-off-by: Robin Murphy <robin.murphy@arm.com>
Closes: https://lore.kernel.org/all/CAGXv+5HJpTYmQ2h-GD7GjyeYT7bL9EBCvu0mz5LgpzJZtzfW0w@mail.gmail.com/
Tested-by: Chen-Yu Tsai <wenst@chromium.org>
Reviewed-by: Lu Baolu <baolu.lu@linux.intel.com>
Link: https://lore.kernel.org/r/e788aa927f6d827dd4ea1ed608fada79f2bab030.1744284228.git.robin.murphy@arm.com
Signed-off-by: Joerg Roedel <jroedel@suse.de>

iommu/vt-d: Remove an unnecessary call set_dma_ops()

Do not touch per-device DMA ops when the driver has been converted to use
the dma-iommu API.

Fixes: c588072bba6b ("iommu/vt-d: Convert intel iommu driver to the iommu ops")
Signed-off-by: Petr Tesarik <ptesarik@suse.com>
Link: https://lore.kernel.org/r/20250403165605.278541-1-ptesarik@suse.com
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

iommu/vt-d: Wire up irq_ack() to irq_move_irq() for posted MSIs

Set the posted MSI irq_chip's irq_ack() hook to irq_move_irq() instead of
a dummy/empty callback so that posted MSIs process pending changes to the
IRQ's SMP affinity. Failure to honor a pending set-affinity results in
userspace being unable to change the effective affinity of the IRQ, as
IRQD_SETAFFINITY_PENDING is never cleared and so irq_set_affinity_locked()
always defers moving the IRQ.

The issue is most easily reproducible by setting /proc/irq/xx/smp_affinity
multiple times in quick succession, as only the first update is likely to
be handled in process context.

Fixes: ed1e48ea4370 ("iommu/vt-d: Enable posted mode for device MSIs")
Cc: Robert Lippert <rlippert@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Reported-by: Wentao Yang <wentaoyang@google.com>
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <seanjc@google.com>
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
Link: https://lore.kernel.org/r/20250321194249.1217961-1-seanjc@google.com
Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com>
Signed-off-by: Joerg Roedel <jroedel@suse.de>

iommu: Fix crash in report_iommu_fault()

The following crash is observed while handling an IOMMU fault with a
recent kernel:

kernel tried to execute NX-protected page - exploit attempt? (uid: 0)
BUG: unable to handle page fault for address: ffff8c708299f700
PGD 19ee01067 P4D 19ee01067 PUD 101c10063 PMD 80000001028001e3
Oops: Oops: 0011 [#1] SMP NOPTI
CPU: 4 UID: 0 PID: 139 Comm: irq/25-AMD-Vi Not tainted 6.15.0-rc1+ #20 PREEMPT(lazy)
Hardware name: LENOVO 21D0/LNVNB161216, BIOS J6CN50WW 09/27/2024
RIP: 0010:0xffff8c708299f700
Call Trace:
<TASK>
? report_iommu_fault+0x78/0xd3
? amd_iommu_report_page_fault+0x91/0x150
? amd_iommu_int_thread+0x77/0x180
? __pfx_irq_thread_fn+0x10/0x10
? irq_thread_fn+0x23/0x60
? irq_thread+0xf9/0x1e0
? __pfx_irq_thread_dtor+0x10/0x10
? __pfx_irq_thread+0x10/0x10
? kthread+0xfc/0x240
? __pfx_kthread+0x10/0x10
? ret_from_fork+0x34/0x50
? __pfx_kthread+0x10/0x10
? ret_from_fork_asm+0x1a/0x30
</TASK>

report_iommu_fault() checks for an installed handler comparing the
corresponding field to NULL. It can (and could before) be called for a
domain with a different cookie type - IOMMU_COOKIE_DMA_IOVA, specifically.
Cookie is represented as a union so we may end up with a garbage value
treated there if this happens for a domain with another cookie type.

Formerly there were two exclusive cookie types in the union.
IOMMU_DOMAIN_SVA has a dedicated iommu_report_device_fault().

Call the fault handler only if the passed domain has a required cookie
type.

Found by Linux Verification Center (linuxtesting.org).

Fixes: 6aa63a4ec947 ("iommu: Sort out domain user data")
Signed-off-by: Fedor Pchelkin <pchelkin@ispras.ru>
Reviewed-by: Kevin Tian <kevin.tian@intel.com>
Reviewed-by: Jason Gunthorpe <jgg@nvidia.com>
Link: https://lore.kernel.org/r/20250408213342.285955-1-pchelkin@ispras.ru
Signed-off-by: Joerg Roedel <jroedel@suse.de>

Merge tag 'drm-fixes-2025-04-11-1' of https://gitlab.freedesktop.org/drm/kernel

Pull drm fixes from Dave Airlie:
"Weekly fixes, as expected it has a bit more in it than probably usual
  for rc2. amdgpu/xe/i915 lead the way with fixes all over for a bunch
  of other drivers. Nothing major stands out from what I can see.

  tests:
   - Clean up struct drm_display_mode in various places

  i915:
   - Fix scanline offset for LNL+ and BMG+
   - Fix GVT unterminated-string-initialization build warning
   - Fix DP rate limit when sink doesn't support TPS4
   - Handle GDDR + ECC memory type detection
   - Fix VRR parameter change check
   - Fix fence not released on early probe errors
   - Disable render power gating during live selftests

  xe:
   - Add another BMG PCI ID
   - Fix UAFs on migration paths
   - Fix shift-out-of-bounds access on TLB invalidation
   - Ensure ccs_mode is correctly set on gt reset
   - Extend some HW workarounds to Xe3
   - Fix PM runtime get/put on sysfs files
   - Fix u64 division on 32b
   - Fix flickering due to missing L3 invalidations
   - Fix missing error code return

  amdgpu:
   - MES FW version caching fixes
   - Only use GTT as a fallback if we already have a backing store
   - dma_buf fix
   - IP discovery fix
   - Replay and PSR with VRR fix
   - DC FP fixes
   - eDP fixes
   - KIQ TLB invalidate fix
   - Enable dmem groups support
   - Allow pinning VRAM dma bufs if imports can do P2P
   - Workload profile fixes
   - Prevent possible division by 0 in fan handling

  amdkfd:
   - Queue reset fixes

  imagination:
   - Fix overflow
   - Fix use-after-free

  ivpu:
   - Fix suspend/resume

  nouveau:
   - Do not deref dangling pointer

  rockchip:
   - Set DP/HDMI registers correctly

  udmabuf:
   - Fix overflow

  virtgpu:
   - Set reservation lock on dma-buf import
   - Fix error handling in prepare_fb"

* tag 'drm-fixes-2025-04-11-1' of https://gitlab.freedesktop.org/drm/kernel: (58 commits)
  drm/rockchip: dw_hdmi_qp: Fix io init for dw_hdmi_qp_rockchip_resume
  drm/rockchip: vop2: Fix interface enable/mux setting of DP1 on rk3588
  drm/amdgpu/mes12: optimize MES pipe FW version fetching
  drm/amd/pm/smu11: Prevent division by zero
  drm/amdgpu: cancel gfx idle work in device suspend for s0ix
  drm/amd/display: pause the workload setting in dm
  drm/amdgpu/pm/swsmu: implement pause workload profile
  drm/amdgpu/pm: add workload profile pause helper
  drm/i915/huc: Fix fence not released on early probe errors
  drm/i915/vrr: Add vrr.vsync_{start, end} in vrr_params_changed
  drm/tests: probe-helper: Fix drm_display_mode memory leak
  drm/tests: modes: Fix drm_display_mode memory leak
  drm/tests: modes: Fix drm_display_mode memory leak
  drm/tests: cmdline: Fix drm_display_mode memory leak
  drm/tests: modeset: Fix drm_display_mode memory leak
  drm/tests: modeset: Fix drm_display_mode memory leak
  drm/tests: helpers: Create kunit helper to destroy a drm_display_mode
  drm/xe: Restore EIO errno return when GuC PC start fails
  drm/xe: Invalidate L3 read-only cachelines for geometry streams too
  drm/xe: avoid plain 64-bit division
  ...

Merge tag 'bcachefs-2025-04-10' of git://evilpiepirate.org/bcachefs

Pull bcachefs fixes from Kent Overstreet:
"Mostly minor fixes.

  Eric Biggers' crypto API conversion is included because of long
  standing sporadic crashes - mostly, but not entirely syzbot - in the
  crypto API code when calling poly1305, which have been nigh impossible
  to reproduce and debug.

  His rework deletes the code where we've seen the crashes, so either
  it'll be a fix or we'll end up with backtraces we can debug. (Thanks
  Eric!)"

* tag 'bcachefs-2025-04-10' of git://evilpiepirate.org/bcachefs:
  bcachefs: Use sort_nonatomic() instead of sort()
  bcachefs: Remove unnecessary softdep on xxhash
  bcachefs: use library APIs for ChaCha20 and Poly1305
  bcachefs: Fix duplicate "ro,read_only" in opts at startup
  bcachefs: Fix UAF in bchfs_read()
  bcachefs: Use cpu_to_le16 for dirent lengths
  bcachefs: Fix type for parameter in journal_advance_devs_to_next_bucket
  bcachefs: Fix escape sequence in prt_printf

Merge tag 'drm-xe-fixes-2025-04-10' of https://gitlab.freedesktop.org/drm/xe/kernel into drm-fixes

Driver Changes:
- Add another BMG PCI ID
- Fix UAFs on migration paths
- Fix shift-out-of-bounds access on TLB invalidation
- Ensure ccs_mode is correctly set on gt reset
- Extend some HW workarounds to Xe3
- Fix PM runtime get/put on sysfs files
- Fix u64 division on 32b
- Fix flickering due to missing L3 invalidations
- Fix missing error code return

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Lucas De Marchi <lucas.demarchi@intel.com>
Link: https://lore.kernel.org/r/unq5j26aejbrjz5nuvmdtcgupyix5bacpoahod4bdohlvwrney@kekimsi5ossx

Merge tag 'drm-misc-fixes-2025-04-10' of https://gitlab.freedesktop.org/drm/misc/kernel into drm-fixes

Short summary of fixes pull:

imagination:
- Fix overflow
- Fix use-after-free

ivpu:
- Fix suspend/resume

nouveau:
- Do not deref dangling pointer

rockchip:
- Set DP/HDMI registers correctly

tests:
- Clean up struct drm_display_mode in various places

udmabuf:
- Fix overflow

virtgpu:
- Set reservation lock on dma-buf import
- Fix error handling in prepare_fb

Signed-off-by: Dave Airlie <airlied@redhat.com>
From: Thomas Zimmermann <tzimmermann@suse.de>
Link: https://lore.kernel.org/r/20250410122414.GA32202@2a02-2454-fd5e-fd00-d686-8907-6053-f8d8.dyn6.pyur.net

Merge tag 'irq-urgent-2025-04-10' of git://git./linux/kernel/git/tip/tip

Pull misc irqchip fixes from Ingo Molnar:

- Fix NULL pointer dereference crashes due to missing .chip_flags setup
   in the sg2042-msi and irq-bcm2712-mip irqchip drivers

- Remove the davinci aintc irqchip driver's leftover header too

* tag 'irq-urgent-2025-04-10' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  irqchip/irq-bcm2712-mip: Set EOI/ACK flags in msi_parent_ops
  irqchip/sg2042-msi: Add missing chip flags
  irqchip/davinci: Remove leftover header

Merge tag 'timers-urgent-2025-04-10' of git://git./linux/kernel/git/tip/tip

Pull misc timer fixes from Ingo Molnar:

- Fix missing ACCESS_PRIVATE() that triggered a Sparse warning

- Fix lockdep false positive in tick_freeze() on CONFIG_PREEMPT_RT=y

- Avoid <vdso/unaligned.h> macro's variable shadowing to address build
   warning that triggers under W=2 builds

* tag 'timers-urgent-2025-04-10' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  vdso: Address variable shadowing in macros
  timekeeping: Add a lockdep override in tick_freeze()
  hrtimer: Add missing ACCESS_PRIVATE() for hrtimer::function

Merge tag 'x86-urgent-2025-04-10' of git://git./linux/kernel/git/tip/tip

Pull misc x86 fixes from Ingo Molnar:

- Fix CPU topology related regression that limited Xen PV guests to a
   single CPU

- Fix ancient e820__register_nosave_regions() bugs that were causing
   problems with kexec's artificial memory maps

- Fix an S4 hibernation crash caused by two missing ENDBR's that were
   mistakenly removed in a recent commit

- Fix a resctrl serialization bug

- Fix early_printk documentation and comments

- Fix RSB bugs, combined with preparatory updates to better match the
   code to vendor recommendations.

- Add RSB mitigation document

- Fix/update documentation

- Fix the erratum_1386_microcode[] table to be NULL terminated

* tag 'x86-urgent-2025-04-10' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/ibt: Fix hibernate
  x86/cpu: Avoid running off the end of an AMD erratum table
  Documentation/x86: Zap the subsection letters
  Documentation/x86: Update the naming of CPU features for /proc/cpuinfo
  x86/bugs: Add RSB mitigation document
  x86/bugs: Don't fill RSB on context switch with eIBRS
  x86/bugs: Don't fill RSB on VMEXIT with eIBRS+retpoline
  x86/bugs: Fix RSB clearing in indirect_branch_prediction_barrier()
  x86/bugs: Use SBPB in write_ibpb() if applicable
  x86/bugs: Rename entry_ibpb() to write_ibpb()
  x86/early_printk: Use 'mmio32' for consistency, fix comments
  x86/resctrl: Fix rdtgroup_mkdir()'s unlocked use of kernfs_node::name
  x86/e820: Fix handling of subpage regions when calculating nosave ranges in e820__register_nosave_regions()
  x86/acpi: Don't limit CPUs to 1 for Xen PV guests due to disabled ACPI

Merge tag 'perf-urgent-2025-04-10' of git://git./linux/kernel/git/tip/tip

Pull misc perf events fixes from Ingo Molnar:

- Fix __free_event() corner case splat

- Fix false-positive uprobes related lockdep splat on
   CONFIG_PREEMPT_RT=y kernels

- Fix a complicated perf sigtrap race that may result in hangs

* tag 'perf-urgent-2025-04-10' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  perf: Fix hang while freeing sigtrap event
  uprobes: Avoid false-positive lockdep splat on CONFIG_PREEMPT_RT=y in the ri_timer() uprobe timer callback, use raw_write_seqcount_*()
  perf/core: Fix WARN_ON(!ctx) in __free_event() for partial init

Merge tag 'objtool-urgent-2025-04-10' of git://git./linux/kernel/git/tip/tip

Pull misc objtool fixes from Ingo Molnar:

- Remove the recently introduced ANNOTATE_IGNORE_ALTERNATIVE noise from
   clac()/stac() code to make .s files more readable

- Fix INSN_SYSCALL / INSN_SYSRET semantics

- Fix various false-positive warnings

* tag 'objtool-urgent-2025-04-10' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  objtool: Fix false-positive "ignoring unreachables" warning
  objtool: Remove ANNOTATE_IGNORE_ALTERNATIVE from CLAC/STAC
  objtool, xen: Fix INSN_SYSCALL / INSN_SYSRET semantics
  objtool: Stop UNRET validation on UD2
  objtool: Split INSN_CONTEXT_SWITCH into INSN_SYSCALL and INSN_SYSRET
  objtool: Fix INSN_CONTEXT_SWITCH handling in validate_unret()

objtool: Fix false-positive "ignoring unreachables" warning

There's no need to try to automatically disable unreachable warnings if
they've already been manually disabled due to CONFIG_KCOV quirks.

This avoids a spurious warning with a KCOV kernel:

fs/smb/client/cifs_unicode.o: warning: objtool: cifsConvertToUTF16.part.0+0xce5: ignoring unreachables due to jump table quirk

Fixes: eeff7ac61526 ("objtool: Warn when disabling unreachable warnings")
Reported-by: kernel test robot <lkp@intel.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/5eb28eeb6a724b7d945a961cfdcf8d41e6edf3dc.1744238814.git.jpoimboe@kernel.org
Closes: https://lore.kernel.org/r/202504090910.QkvTAR36-lkp@intel.com/

bpf: Convert queue_stack map to rqspinlock

Replace all usage of raw_spinlock_t in queue_stack_maps.c with
rqspinlock. This is a map type with a set of open syzbot reports
reproducing possible deadlocks. Prior attempt to fix the issues
was at [0], but was dropped in favor of this approach.

Make sure we return the -EBUSY error in case of possible deadlocks or
timeouts, just to make sure user space or BPF programs relying on the
error code to detect problems do not break.

With these changes, the map should be safe to access in any context,
including NMIs.

[0]: https://lore.kernel.org/all/20240429165658.1305969-1-sidchintamaneni@gmail.com

Reported-by: syzbot+8bdfc2c53fb2b63e1871@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/all/0000000000004c3fc90615f37756@google.com
Reported-by: syzbot+252bc5c744d0bba917e1@syzkaller.appspotmail.com
Closes: https://lore.kernel.org/all/000000000000c80abd0616517df9@google.com
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20250410153142.2064340-1-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

bpf: Use architecture provided res_smp_cond_load_acquire

In v2 of rqspinlock [0], we fixed potential problems with WFE usage in
arm64 to fallback to a version copied from Ankur's series [1]. This
logic was moved into arch-specific headers in v3 [2].

However, we missed using the arch-provided res_smp_cond_load_acquire
in commit ebababcd0372 ("rqspinlock: Hardcode cond_acquire loops for arm64")
due to a rebasing mistake between v2 and v3 of the rqspinlock series.
Fix the typo to fallback to the arm64 definition as we did in v2.

  [0]: https://lore.kernel.org/bpf/20250206105435.2159977-18-memxor@gmail.com
  [1]: https://lore.kernel.org/lkml/20250203214911.898276-1-ankur.a.arora@oracle.com
  [2]: https://lore.kernel.org/bpf/20250303152305.3195648-9-memxor@gmail.com

Fixes: ebababcd0372 ("rqspinlock: Hardcode cond_acquire loops for arm64")
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20250410145512.1876745-1-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

selftests/bpf: Make res_spin_lock AA test condition stronger

Let's make sure that we see a EDEADLK and ETIMEDOUT whenever checking
for the AA tests (in case of simple AA and AA after exhausting 31
entries).

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20250410170023.2670683-1-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

Merge tag 'net-6.15-rc2' of git://git./linux/kernel/git/netdev/net

Pull networking fixes from Paolo Abeni:
"Including fixes from netfilter.

  Current release - regressions:

    - core: hold instance lock during NETDEV_CHANGE

    - rtnetlink: fix bad unlock balance in do_setlink()

    - ipv6:
       - fix null-ptr-deref in addrconf_add_ifaddr()
       - align behavior across nexthops during path selection

  Previous releases - regressions:

    - sctp: prevent transport UaF in sendmsg

    - mptcp: only inc MPJoinAckHMacFailure for HMAC failures

  Previous releases - always broken:

    - sched:
       - make ->qlen_notify() idempotent
       - ensure sufficient space when sending filter netlink notifications
       - sch_sfq: really don't allow 1 packet limit

    - netfilter: fix incorrect avx2 match of 5th field octet

    - tls: explicitly disallow disconnect

    - eth: octeontx2-pf: fix VF root node parent queue priority"

* tag 'net-6.15-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net: (38 commits)
  ethtool: cmis_cdb: Fix incorrect read / write length extension
  selftests: netfilter: add test case for recent mismatch bug
  nft_set_pipapo: fix incorrect avx2 match of 5th field octet
  net: ppp: Add bound checking for skb data on ppp_sync_txmung
  net: Fix null-ptr-deref by sock_lock_init_class_and_name() and rmmod.
  ipv6: Align behavior across nexthops during path selection
  net: phy: allow MDIO bus PM ops to start/stop state machine for phylink-controlled PHY
  net: phy: move phy_link_change() prior to mdio_bus_phy_may_suspend()
  selftests/tc-testing: sfq: check that a derived limit of 1 is rejected
  net_sched: sch_sfq: move the limit validation
  net_sched: sch_sfq: use a temporary work area for validating configuration
  net: libwx: handle page_pool_dev_alloc_pages error
  selftests: mptcp: validate MPJoin HMacFailure counters
  mptcp: only inc MPJoinAckHMacFailure for HMAC failures
  rtnetlink: Fix bad unlock balance in do_setlink().
  net: ethtool: Don't call .cleanup_data when prepare_data fails
  tc: Ensure we have enough buffer space when sending filter netlink notifications
  net: libwx: Fix the wrong Rx descriptor field
  octeontx2-pf: qos: fix VF root node parent queue index
  selftests: tls: check that disconnect does nothing
  ...

Merge tag 'nvme-6.15-2025-04-10' of git://git.infradead.org/nvme into block-6.15

Pull NVMe updates from Christoph:

"nvme updates for Linux 6.15

- nvmet fc/fcloop refcounting fixes (Daniel Wagner)
- fix missed namespace/ANA scans (Hannes Reinecke)
- fix a use after free in the new TCP netns support (Kuniyuki Iwashima)
- fix a NULL instead of false review in multipath (Uday Shankar)"

* tag 'nvme-6.15-2025-04-10' of git://git.infradead.org/nvme:
  nvmet-fc: put ref when assoc->del_work is already scheduled
  nvmet-fc: take tgtport reference only once
  nvmet-fc: update tgtport ref per assoc
  nvmet-fc: inline nvmet_fc_free_hostport
  nvmet-fc: inline nvmet_fc_delete_assoc
  nvmet-fcloop: add ref counting to lport
  nvmet-fcloop: replace kref with refcount
  nvmet-fcloop: swap list_add_tail arguments
  nvme-tcp: fix use-after-free of netns by kernel TCP socket.
  nvme: multipath: fix return value of nvme_available_path
  nvme: re-read ANA log page after ns scan completes
  nvme: requeue namespace scan on missed AENs

ext4: don't treat fhandle lookup of ea_inode as FS corruption

A file handle that userspace provides to open_by_handle_at() can
legitimately contain an outdated inode number that has since been reused
for another purpose - that's why the file handle also contains a generation
number.

But if the inode number has been reused for an ea_inode, check_igot_inode()
will notice, __ext4_iget() will go through ext4_error_inode(), and if the
inode was newly created, it will also be marked as bad by iget_failed().
This all happens before the point where the inode generation is checked.

ext4_error_inode() is supposed to only be used on filesystem corruption; it
should not be used when userspace just got unlucky with a stale file
handle. So when this happens, let __ext4_iget() just return an error.

Fixes: b3e6bcb94590 ("ext4: add EA_INODE checking to ext4_iget()")
Signed-off-by: Jann Horn <jannh@google.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20241129-ext4-ignore-ea-fhandle-v1-1-e532c0d1cee0@google.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

Merge tag 'for-linus-6.15a-rc2-tag' of git://git./linux/kernel/git/xen/tip

Pull xen fixes from Juergen Gross:

- A simple fix adding the module description of the Xenbus frontend
   module

- A fix correcting the xen-acpi-processor Kconfig dependency for PVH
   Dom0 support

- A fix for the Xen balloon driver when running as Xen Dom0 in PVH mode

- A fix for PVH Dom0 in order to avoid problems with CPU idle and
   frequency drivers conflicting with Xen

* tag 'for-linus-6.15a-rc2-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/xen/tip:
  x86/xen: disable CPU idle and frequency drivers for PVH dom0
  x86/xen: fix balloon target initialization for PVH dom0
  xen: Change xen-acpi-processor dom0 dependency
  xenbus: add module description

Merge tag 'block-6.15-20250410' of git://git.kernel.dk/linux

Pull block fixes from Jens Axboe:

- Add a missing ublk selftest script, from test additions added last
   week

- Two fixes for ublk error recovery and reissue

- Cleanup of ublk argument passing

* tag 'block-6.15-20250410' of git://git.kernel.dk/linux:
  ublk: pass ublksrv_ctrl_cmd * instead of io_uring_cmd *
  ublk: don't fail request for recovery & reissue in case of ubq->canceling
  ublk: fix handling recovery & reissue in ublk_abort_queue()
  selftests: ublk: fix test_stripe_04

Merge tag 'io_uring-6.15-20250410' of git://git.kernel.dk/linux

Pull io_uring fixes from Jens Axboe:

- Reject zero sized legacy provided buffers upfront. No ill side
   effects from this one, only really done to shut up a silly syzbot
   test case.

- Fix for a regression in tag posting for registered files or buffers,
   where the tag would be posted even when the registration failed.

- two minor zcrx cleanups for code added this merge window.

* tag 'io_uring-6.15-20250410' of git://git.kernel.dk/linux:
  io_uring/kbuf: reject zero sized provided buffers
  io_uring/zcrx: separate niov number from pages
  io_uring/zcrx: put refill data into separate cache line
  io_uring: don't post tag CQEs on file/buffer registration failure

Merge tag 'gpio-fixes-for-v6.15-rc2' of git://git./linux/kernel/git/brgl/linux

Pull gpio fixes from Bartosz Golaszewski:

- fix resource handling in gpio-tegra186

- fix wakeup source leaks in gpio-mpc8xxx and gpio-zynq

- fix minor issues with some GPIO OF quirks

- deprecate GPIOD_FLAGS_BIT_NONEXCLUSIVE and devm_gpiod_unhinge()
   symbols and add a TODO task to track replacing them with a better
   solution

* tag 'gpio-fixes-for-v6.15-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/brgl/linux:
  gpiolib: of: Move Atmel HSMCI quirk up out of the regulator comment
  gpiolib: of: Fix the choice for Ingenic NAND quirk
  gpio: zynq: Fix wakeup source leaks on device unbind
  gpio: mpc8xxx: Fix wakeup source leaks on device unbind
  gpio: TODO: track the removal of regulator-related workarounds
  MAINTAINERS: add more keywords for the GPIO subsystem entry
  gpio: deprecate devm_gpiod_unhinge()
  gpio: deprecate the GPIOD_FLAGS_BIT_NONEXCLUSIVE flag
  gpio: tegra186: fix resource handling in ACPI probe path